CN112578839A - Voltage stabilizing module and electronic device - Google Patents

本发明提供一种稳压模组和电子装置。本发明实施例所述的稳压模组包括电压输出端、控制电路、数字稳压电路和模拟稳压电路；控制电路在稳压模组启动时，向数字稳压电路提供触发信号，并用于在输出电压小于第一电压或大于第二电压时，控制数字稳压电路工作而模拟稳压电路不工作，当输出电压大于第一电压而小于第二电压时，控制模拟稳压电路工作而数字稳压电路不工作；数字稳压电路在接收到触发信号后，控制调高输出电压，并当被控制电路控制而工作时，控制调节输出电压，使得输出电压与参考电压之间的差值的绝对值变小；模拟稳压电路在被控制电路控制而工作时，将输出电压调节至参考电压。本发明既可以提升电压调节速度，又可以保证电压调节精度。

The invention provides a voltage stabilization module and an electronic device. The voltage stabilization module described in the embodiment of the present invention includes a voltage output terminal, a control circuit, a digital voltage stabilization circuit and an analog voltage stabilization circuit; when the voltage stabilization module starts, the control circuit provides a trigger signal to the digital voltage stabilization circuit, and is used for When the output voltage is less than the first voltage or greater than the second voltage, the digital voltage stabilizer circuit is controlled to work and the analog voltage stabilizer circuit does not work; when the output voltage is greater than the first voltage but less than the second voltage, the analog voltage stabilizer circuit is controlled to work and the digital voltage stabilizer circuit is controlled to work The voltage regulator circuit does not work; after receiving the trigger signal, the digital voltage regulator circuit controls to increase the output voltage, and when it is controlled by the control circuit to work, it controls and adjusts the output voltage, so that the difference between the output voltage and the reference voltage is The absolute value becomes smaller; when the analog voltage regulator circuit is controlled by the control circuit to work, the output voltage is adjusted to the reference voltage. The invention can not only improve the voltage regulation speed, but also ensure the voltage regulation accuracy.

Voltage stabilizing module and electronic device

Technical Field

The present invention relates to the field of voltage stabilization technologies, and in particular, to a voltage stabilization module and an electronic device.

Background

As SoC chips (system on chip) become more complex, larger in size and higher in power consumption, low dropout regulators (LDO) are required to provide a simple, low power, fast, and clean internal voltage source.

The analog LDO has a higher bandwidth and a better PSR (Primary Switching Regulator), but has a smaller operating range; digital LDOs have a larger operating range but have a larger output noise.

Disclosure of Invention

The invention mainly aims to provide a voltage stabilizing module and an electronic device, and solves the problem that the conventional voltage stabilizing module cannot give consideration to both voltage regulation speed and voltage regulation precision.

In order to achieve the above object, the present invention provides a voltage stabilizing module, which comprises a voltage output terminal, a control circuit, a digital voltage stabilizing circuit and an analog voltage stabilizing circuit,

the control circuit is respectively electrically connected with the voltage output end, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, and is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and controlling the digital voltage stabilizing circuit to work and the analog voltage stabilizing circuit to not work when the output voltage provided by the voltage output end is less than a first voltage or more than a second voltage, and controlling the analog voltage stabilizing circuit to work and the digital voltage stabilizing circuit to not work when the output voltage is more than the first voltage and less than the second voltage;

the digital voltage stabilizing circuit is electrically connected with the voltage output end, is used for controlling and increasing the output voltage after receiving the trigger signal, and is used for controlling and adjusting the output voltage when being controlled by the control circuit to work so as to reduce the absolute value of the difference value between the output voltage and the reference voltage;

the analog voltage stabilizing circuit is electrically connected with the voltage output end and is used for adjusting the output voltage to the reference voltage when the analog voltage stabilizing circuit is controlled by the control circuit to work;

the reference voltage is greater than the first voltage and less than the second voltage.

Optionally, the control circuit is further configured to provide a first turn-on control signal to the digital voltage stabilizing circuit when the output voltage is less than a first voltage or greater than a second voltage, and provide a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control terminal, and further configured to provide a second turn-off control signal to the digital voltage stabilizing circuit when the output voltage is greater than the first voltage and less than the second voltage, and provide a second turn-on control signal to the analog voltage stabilizing circuit through the voltage stabilizing control terminal;

the digital voltage stabilizing circuit is further used for controlling to increase the output voltage when the output voltage is judged to be smaller than a preset reference voltage when the first turn-on control signal is received, controlling to decrease the output voltage when the output voltage is judged to be larger than the reference voltage, and stopping working when the second turn-off control signal is received;

the analog voltage stabilizing circuit is further configured to regulate the output voltage to the reference voltage when receiving the second turn-on control signal, and to stop working when receiving the first turn-off control signal.

Optionally, the digital voltage stabilizing circuit includes an analog-to-digital conversion unit, a charging control unit, and an energy storage unit;

the analog-to-digital conversion unit is respectively electrically connected with the control circuit, the voltage output end and the charging control unit, and is used for comparing the output voltage with the reference voltage when receiving the trigger signal or the first starting control signal, providing a first charging control signal to the charging control unit when the output voltage is smaller than the reference voltage, and providing a first charging stopping control signal to the charging control unit when the output voltage is larger than the reference voltage;

the charging control unit is respectively electrically connected with the charging voltage end and the energy storage unit and used for controlling the charging voltage end to be communicated with the energy storage unit when receiving the first charging control signal, so that the charging voltage signal provided by the charging voltage end is used for charging the energy storage unit, and the charging control unit is used for controlling the charging voltage end to be disconnected with the energy storage unit when receiving the first charging stop control signal.

Optionally, the analog-to-digital conversion unit includes an N-bit analog-to-digital converter; n is a positive integer; the first charge control signal comprises N first control signals;

the N-bit analog-to-digital converter is respectively electrically connected with the voltage output end, the reference voltage end and the charging control unit and is used for outputting the N first control signals to the charging control unit according to the output voltage and the reference voltage so as to control the connection or disconnection between the charging voltage end and the energy storage unit;

the reference voltage terminal is used for providing a reference voltage.

Optionally, the N-bit analog-to-digital converter is a successive approximation register analog-to-digital converter.

Optionally, the charge control unit includes N charge control transistors;

a control electrode of the nth charging control transistor is connected with the nth first control signal, a first electrode of the nth charging control transistor is electrically connected with the charging voltage end, and a second electrode of the nth charging control transistor is electrically connected with the energy storage unit;

n is a positive integer less than or equal to N.

Optionally, the energy storage unit includes a storage capacitor;

the first end of the storage capacitor is electrically connected with the voltage output end, and the second end of the storage capacitor is electrically connected with the ground end.

Optionally, the analog voltage stabilizing circuit includes an operational amplifier, a first control transistor and a second control transistor;

a first input end of the operational amplifier is electrically connected with the voltage output end, a second input end of the operational amplifier is connected with a reference voltage, and an output end of the operational amplifier is electrically connected with a control electrode of the second control transistor;

the control electrode of the first control transistor is electrically connected with the voltage stabilization control end, the first electrode of the first control transistor is electrically connected with the third voltage end, and the second electrode of the first control transistor is electrically connected with the control electrode of the second control transistor;

the first electrode of the second control transistor is electrically connected with the fourth voltage end, and the second electrode of the second control transistor is electrically connected with the energy storage unit.

Optionally, the control circuit includes a control unit, a first comparator and a second comparator;

the first comparator is electrically connected with the voltage output end, is connected with a first voltage, and is used for comparing the output voltage with the first voltage and transmitting an obtained first comparison result to the control unit;

the second comparator is electrically connected with the voltage output end and is connected with a second voltage, and the second comparator is used for comparing the output voltage with the second voltage and transmitting an obtained second comparison result to the control unit;

the control unit is respectively and electrically connected with the first comparator, the second comparator, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, the digital voltage stabilizing circuit is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and providing a first starting control signal for the digital voltage stabilizing circuit when the output voltage is less than a first voltage or more than a second voltage according to the first comparison result and the second comparison result, providing a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control end, and when the output voltage is obtained to be greater than the first voltage and less than the second voltage according to the first comparison result and the second comparison result, and providing a second turn-off control signal for the digital voltage stabilizing circuit, and providing a second turn-on control signal for the analog voltage stabilizing circuit through the voltage stabilizing control end.

Optionally, the control unit is a finite state machine.

The invention also provides an electronic device comprising the voltage stabilizing module.

After the voltage stabilizing module and the electronic device are started, the control circuit firstly controls the digital voltage stabilizing circuit to coarsely adjust the output voltage, and the adjustment speed can be improved due to the high adjustment speed of the digital voltage stabilizing circuit; when the output voltage is greater than the first voltage and less than the second voltage, the control circuit controls the digital voltage stabilizing circuit to stop working so as to save power; the control circuit controls the analog voltage stabilizing circuit to perform fine adjustment on the output voltage so as to adjust the output voltage to a reference voltage and keep the output voltage at the reference voltage. By adopting the voltage stabilizing module provided by the embodiment of the invention, the voltage adjusting speed can be increased, and the voltage adjusting precision can be ensured.

Drawings

Fig. 1 is a structural diagram of a voltage stabilizing module according to an embodiment of the present invention;

fig. 2 is a structural diagram of a voltage regulator module according to another embodiment of the invention;

fig. 3 is a structural diagram of a voltage regulator module according to another embodiment of the invention;

fig. 4 is a structural diagram of a voltage regulator module according to still another embodiment of the present invention;

fig. 5 is a circuit diagram of a voltage stabilizing module according to an embodiment of the invention;

fig. 6 is a simulation operation timing diagram of the embodiment of the voltage stabilizing module shown in fig. 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The transistors used in all embodiments of the present invention may be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. In the embodiment of the present invention, in order to distinguish two poles of the transistor except the control pole, one pole is called a first pole, and the other pole is called a second pole.

In practical operation, when the transistor is a triode, the control electrode may be a base electrode, the first electrode may be a collector electrode, and the second electrode may be an emitter electrode; alternatively, the control electrode may be a base electrode, the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.

In practical operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode; alternatively, the control electrode may be a gate electrode, the first electrode may be a drain electrode, and the second electrode may be a source electrode.

The voltage stabilizing module of the embodiment of the invention comprises a voltage output end, a control circuit, a digital voltage stabilizing circuit and an analog voltage stabilizing circuit, wherein,

the control circuit is respectively electrically connected with the voltage output end, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, and is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and controlling the digital voltage stabilizing circuit to work and the analog voltage stabilizing circuit to not work when the output voltage provided by the voltage output end is less than a first voltage or more than a second voltage, and controlling the analog voltage stabilizing circuit to work and the digital voltage stabilizing circuit to not work when the output voltage is more than the first voltage and less than the second voltage;

the digital voltage stabilizing circuit is electrically connected with the voltage output end, is used for controlling and increasing the output voltage after receiving the trigger signal, and is used for controlling and adjusting the output voltage when being controlled by the control circuit to work so as to reduce the absolute value of the difference value between the output voltage and the reference voltage;

the analog voltage stabilizing circuit is electrically connected with the voltage output end and is used for adjusting the output voltage to the reference voltage when the analog voltage stabilizing circuit is controlled by the control circuit to work;

the reference voltage is greater than the first voltage and less than the second voltage.

After the voltage stabilizing module is started, the control circuit firstly controls the digital voltage stabilizing circuit to carry out coarse adjustment on the output voltage, and the adjustment speed can be improved due to the high adjustment speed of the digital voltage stabilizing circuit; when the output voltage is greater than the first voltage and less than the second voltage, the control circuit controls the digital voltage stabilizing circuit to stop working so as to save power; the control circuit controls the analog voltage stabilizing circuit to perform fine adjustment on the output voltage so as to adjust the output voltage to a reference voltage and keep the output voltage at the reference voltage. By adopting the voltage stabilizing module provided by the embodiment of the invention, the voltage adjusting speed can be increased, and the voltage adjusting precision can be ensured.

Optionally, the control circuit is further configured to provide a first turn-on control signal to the digital voltage stabilizing circuit when the output voltage is less than a first voltage or greater than a second voltage, and provide a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control terminal, and further configured to provide a second turn-off control signal to the digital voltage stabilizing circuit when the output voltage is greater than the first voltage and less than the second voltage, and provide a second turn-on control signal to the analog voltage stabilizing circuit through the voltage stabilizing control terminal;

the digital voltage stabilizing circuit is further used for controlling to increase the output voltage when the output voltage is judged to be smaller than a preset reference voltage when the first turn-on control signal is received, controlling to decrease the output voltage when the output voltage is judged to be larger than the reference voltage, and stopping working when the second turn-off control signal is received;

the analog voltage stabilizing circuit is further configured to regulate the output voltage to the reference voltage when receiving the second turn-on control signal, and to stop working when receiving the first turn-off control signal.

In the embodiment of the present invention, the reference voltage is between the first voltage and the second voltage, but not limited thereto.

In the embodiment of the present invention, the charging voltage terminal V1 may be a positive voltage terminal, but is not limited thereto.

In a specific implementation, the analog-to-digital conversion unit may include an N-bit analog-to-digital converter; n is a positive integer; the first charge control signal comprises N first control signals;

the N-bit analog-to-digital converter is respectively electrically connected with the voltage output end, the reference voltage end and the charging control unit and is used for outputting the N first control signals to the charging control unit according to the output voltage and the reference voltage so as to control the connection or disconnection between the charging voltage end and the energy storage unit;

the reference voltage terminal is used for providing a reference voltage.

In the embodiment of the present invention, the N-bit analog-to-digital converter may be a SAR (successive approximation register type) analog-to-digital converter.

In an embodiment of the present invention, the analog-to-digital conversion unit may include an N-bit analog-to-digital converter, the N-bit analog-to-digital converter outputs N first control signals, and the charge control unit may include N charge control transistors, and the nth charge control transistor is controlled by the nth first control signal to be turned on or off.

Optionally, the charge control unit includes N charge control transistors;

a control electrode of the nth charging control transistor is connected with the nth first control signal, a first electrode of the nth charging control transistor is electrically connected with the charging voltage end, and a second electrode of the nth charging control transistor is electrically connected with the energy storage unit;

n is a positive integer less than or equal to N.

In the embodiment of the present invention, the N charging control transistors are of the same type, that is, the N charging control transistors are all p-type transistors, or the N charging control transistors are all N-type transistors.

In a specific implementation, when the analog-to-digital conversion unit may include an N-bit analog-to-digital converter, the N-bit analog-to-digital converter outputs N first control signals, the charge control unit includes N charge control transistors, and when the nth charge control transistor is controlled by the nth first control signal, when the N charge control transistors are p-type transistors, when the nth first control signal is a low voltage signal, the nth charge control transistor is turned on, and when the nth first control signal is a high voltage signal, the nth charge control transistor is turned off; when the N charge control transistors are N-type transistors, when the nth first control signal is a high voltage signal, the nth charge control transistor is turned on, and when the nth first control signal is a low voltage signal, the nth charge control transistor is turned off. In a specific implementation, the energy storage unit may include a storage capacitor;

the first end of the storage capacitor is electrically connected with the voltage output end, and the second end of the storage capacitor is electrically connected with the ground end.

In a specific implementation, the second terminal of the storage capacitor may be electrically connected to not only a ground terminal, but also another dc voltage terminal.

Optionally, the analog voltage stabilizing circuit includes an operational amplifier, a first control transistor and a second control transistor;

a first input end of the operational amplifier is electrically connected with the voltage output end, a second input end of the operational amplifier is connected with a reference voltage, and an output end of the operational amplifier is electrically connected with a control electrode of the second control transistor;

the control electrode of the first control transistor is electrically connected with the voltage stabilization control end, the first electrode of the first control transistor is electrically connected with the third voltage end, and the second electrode of the first control transistor is electrically connected with the control electrode of the second control transistor;

the first electrode of the second control transistor is electrically connected with the fourth voltage end, and the second electrode of the second control transistor is electrically connected with the energy storage unit. In the embodiment of the present invention, the third voltage terminal may be a positive voltage terminal, and the fourth voltage terminal may be a positive voltage terminal, but not limited thereto; the third voltage terminal may also be a negative voltage terminal, depending on the type of the second control transistor.

As shown in fig. 3, based on the embodiment of the voltage stabilizing module shown in fig. 2, the analog voltage stabilizing circuit may include an operational amplifier Amp, a first control transistor T1 and a second control transistor T2;

a first input end of the operational amplifier Amp is electrically connected with the voltage output end Out, a second input end of the operational amplifier Amp is connected with a reference voltage Vref, and an output end of the operational amplifier Amp is electrically connected with a gate of the second control transistor T2; the control end of the operational amplifier Amp is electrically connected with the voltage stabilization control end S0;

the gate of the first control transistor T1 is electrically connected to the regulated control terminal S0, the source of the first control transistor T1 is electrically connected to a third voltage terminal V3, and the drain of the first control transistor T1 is electrically connected to the gate of the second control transistor T2;

In the embodiment shown in fig. 3, T1 and T2 are both p-type tfts, but not limited thereto.

In particular implementation, the control circuit may include a control unit, a first comparator and a second comparator;

the first comparator is electrically connected with the voltage output end, is connected with a first voltage, and is used for comparing the output voltage with the first voltage and transmitting an obtained first comparison result to the control unit;

the second comparator is electrically connected with the voltage output end and is connected with a second voltage, and the second comparator is used for comparing the output voltage with the second voltage and transmitting an obtained second comparison result to the control unit;

the control unit is respectively and electrically connected with the first comparator, the second comparator, the digital voltage stabilizing circuit and the analog voltage stabilizing circuit, the digital voltage stabilizing circuit is used for providing a trigger signal for the digital voltage stabilizing circuit when the voltage stabilizing module is started, and providing a first starting control signal for the digital voltage stabilizing circuit when the output voltage is less than a first voltage or more than a second voltage according to the first comparison result and the second comparison result, providing a first turn-off control signal to the analog voltage stabilizing circuit through the voltage stabilizing control end, and when the output voltage is obtained to be greater than the first voltage and less than the second voltage according to the first comparison result and the second comparison result, and providing a second turn-off control signal for the digital voltage stabilizing circuit, and providing a second turn-on control signal for the analog voltage stabilizing circuit through the voltage stabilizing control end.

In the embodiment of the present invention, the control unit may be a Finite State Machine (FSM), but is not limited thereto.

As shown in fig. 5, the voltage stabilizing module according to the embodiment of the present invention includes a voltage output terminal Out, a control circuit, a digital voltage stabilizing circuit, and an analog voltage stabilizing circuit, wherein,

the analog voltage stabilizing circuit comprises an operational amplifier Amp, a first control transistor T1 and a second control transistor T2;

a first input end of the operational amplifier Amp is electrically connected with the voltage output end Out, a second input end of the operational amplifier Amp is connected with a reference voltage Vref, and an output end of the operational amplifier Amp is electrically connected with a gate of the second control transistor T2; the control end of the Amp is electrically connected with the voltage-stabilizing control end S0;

the gate of the first control transistor T1 is electrically connected to the regulated control terminal S0, the source of the first control transistor T1 is electrically connected to a third voltage terminal V3, and the drain of the first control transistor T1 is electrically connected to the gate of the second control transistor T2;

the source of the second control transistor T2 is electrically connected to the fourth voltage terminal V4, and the drain of the second control transistor T2 is electrically connected to the first terminal of Cout;

In the embodiment shown in fig. 5, all transistors are p-type thin film transistors, and the control unit is a FSM, but not limited thereto.

In the embodiment shown in fig. 5, a 3-bit SAR ADC (analog-to-digital converter) is employed for power, area and response time tradeoffs, for multiple distributed LDOs (low dropout regulators) of SoC chips (system-on-chip) with better power and area.

In the embodiment shown in fig. 5, designated by reference numeral L0 is a load.

In operation of the embodiment of the regulator module of the present invention as shown in figure 5,

when the voltage stabilizing module is started, the control unit 41 provides a trigger signal to the 3-bit SAR analog-to-digital converter 51, the 3-bit SAR analog-to-digital converter 51 controls to boost Vout, and when Vout is smaller than a first voltage or Vout is greater than a second voltage, the control unit 41 provides a first start control signal to the 3-bit SAR analog-to-digital converter 51, and the 3-bit SAR analog-to-digital converter 51 controls to output S1, S2 and S3 according to a difference value between Vout and a reference voltage so as to control on and off of M1, M2 and M3; specifically, when the difference between the reference voltage and Vout is large, S1, S2 and S3 are all low voltage signals, M1, M2 and M3 are all turned on to charge Cout with the charging voltage signal provided by the charging voltage terminal V1, and since there are three charging channels at this time, the charging speed is fast; when the difference between the reference voltage and Vout becomes small, S1 becomes a high voltage signal, S2 and S3 are low voltage signals, M1 is turned off, M2 and M3 are turned on, and there are two charging channels; when the difference between the reference voltage and Vout becomes smaller again, S1 and S2 are high voltage signals, S3 is a low voltage signal, M1 and M2 are turned off, M3 is turned on, and a charging channel exists; when the Vout is larger than the reference voltage, S1, S2 and S3 are all high voltage signals, and M1, M2 and M3 are all turned off;

Fig. 6 is a simulation operation timing diagram of the embodiment of the voltage stabilizing module shown in fig. 5.

In fig. 6, the horizontal axis represents time t in seconds, and the vertical axis represents Vout in volts.

The electronic device according to the embodiment of the invention may include the voltage stabilizing module.

When the electronic device is implemented specifically, the electronic device may further include an Soc chip (system-on-chip), the voltage regulation module may be an LDO (low dropout regulator), and the LDO provides a simple structure, low power consumption, high speed, and clean internal power supply for the Soc chip.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.