CN106301068A - A kind of digital driving power - Google Patents
- ️Wed Jan 04 2017
CN106301068A - A kind of digital driving power - Google Patents
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- CN106301068A CN106301068A CN201511017675.8A CN201511017675A CN106301068A CN 106301068 A CN106301068 A CN 106301068A CN 201511017675 A CN201511017675 A CN 201511017675A CN 106301068 A CN106301068 A CN 106301068A Authority
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
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Abstract
The present invention relates to Piezoelectric Ceramic and control technical field, concrete open a kind of digital driving power.The digital driving power of present invention design, the low frequency characteristic of high-voltage amplifier is improved first by current amplification circuit, secondly use D/A converting circuit as analogue signal and the interface of digital signal, the numerically controlled circuit realiration of recycling low-power consumption is to algorithm and the realization of digital control part, possesses simple in construction, built-up circuit feature flexibly；It is provided simultaneously with dynamic property good, the output advantages such as electric current is big, it is possible to achieve digital control to output voltage.
Description
技术领域technical field
本发明涉及压电陶瓷驱动控制技术领域，特别涉及一种数字驱动电源。The invention relates to the technical field of piezoelectric ceramic drive control, in particular to a digital drive power supply.
背景技术Background technique
光学及精密机械的场合都需要较高的位移分辨率，它们对运动位置的精度要求能达到纳米级别，压电陶瓷依据压电效应的原理，使用特殊的压电材料烧结而成，具有体积小、位移分辨率高、动态性能好、发热小等特点，在高精度的纳米定位的场合中有着非常广泛的应用。The occasions of optics and precision machinery require high displacement resolution, and their precision of movement position can reach nanometer level. Piezoelectric ceramics are sintered with special piezoelectric materials according to the principle of piezoelectric effect, and have small volume. , High displacement resolution, good dynamic performance, low heat generation, etc., have a very wide range of applications in high-precision nano-positioning occasions.
通常为了充分发挥压电陶瓷的性能，压电陶瓷需要配备高精度的压电陶瓷驱动电源，压电陶瓷电源最终决定了压电陶瓷的位移精度。当前的压电陶瓷驱动电源中，主要有两种设计方案：电压控制方案和电荷控制方案。其中，电荷控制方案可以有效的补偿压电陶瓷的磁滞特性，成为当前研究的热点，但是电荷控制方案也有动态性能不高的缺点；电荷控制方案有很好的动态性能，电路的软硬件补偿灵活，这种方法在压电陶瓷驱动中应用广泛。Generally, in order to give full play to the performance of piezoelectric ceramics, piezoelectric ceramics need to be equipped with a high-precision piezoelectric ceramic drive power supply, and the piezoelectric ceramic power supply ultimately determines the displacement accuracy of piezoelectric ceramics. In the current piezoelectric ceramic driving power supply, there are mainly two design schemes: voltage control scheme and charge control scheme. Among them, the charge control scheme can effectively compensate the hysteresis characteristics of piezoelectric ceramics, which has become a current research hotspot, but the charge control scheme also has the disadvantage of low dynamic performance; the charge control scheme has good dynamic performance, and the software and hardware compensation of the circuit Flexible, this method is widely used in piezoceramic actuation.
压电陶瓷驱动电源解决方案中，APEX公司研发出一系列的高压运算放大器，通过该高压运算放大器可以便捷的组成压电陶瓷驱动电源，组成的压电陶瓷电源具有体积小，散热设计方便等优点；但是高压运算放大器的低频性能比较差，尤其在发热量比较大的情况下，温度变化引入的低频噪声恶化了电路的性能，使其难以组成高精度的压电陶瓷驱动电源。In the piezoelectric ceramic drive power solution, APEX has developed a series of high-voltage operational amplifiers, through which the piezoelectric ceramic drive power can be easily formed. The piezoelectric ceramic power supply has the advantages of small size and convenient heat dissipation design. ; but the low-frequency performance of the high-voltage operational amplifier is relatively poor, especially in the case of relatively large heat generation, the low-frequency noise introduced by temperature changes deteriorates the performance of the circuit, making it difficult to form a high-precision piezoelectric ceramic drive power supply.
发明内容Contents of the invention
本发明旨在克服现有技术的缺陷，提供一种数字驱动电源。The invention aims to overcome the defects of the prior art and provide a digital driving power supply.
为实现上述目的，本发明采用以下技术方案：To achieve the above object, the present invention adopts the following technical solutions:
数字控制电路，用于将用户的输入转换为数字控制信号；digital control circuitry for converting user input into digital control signals;
数模转换电路，与所述数字控制电路电连接，用于将所述数字控制信号转换为模拟信号；A digital-to-analog conversion circuit, electrically connected to the digital control circuit, for converting the digital control signal into an analog signal;
模拟放大电路，与所述数模转换电路电连接，用于将所述模拟信号进行放大得到驱动信号以供所述压电陶瓷使用。An analog amplifier circuit is electrically connected to the digital-to-analog conversion circuit, and is used to amplify the analog signal to obtain a driving signal for use by the piezoelectric ceramic.
一些实施例中，所述电源还包括：In some embodiments, the power supply also includes:
充放电电路，与所述模拟放大电路电连接，用于稳定所述驱动信号以供所述压电陶瓷使用。The charging and discharging circuit is electrically connected with the analog amplifying circuit, and is used for stabilizing the driving signal for use by the piezoelectric ceramic.
另一些实施例中，所述模拟放大电路包括：In other embodiments, the analog amplifier circuit includes:
高压放大电路以及电流放大电路，High voltage amplifying circuit and current amplifying circuit,
所述高压放大电路包括PA95高电压线性放大器；The high-voltage amplifying circuit includes a PA95 high-voltage linear amplifier;
所述电流放大电路包括用于减小所述模拟放大电路交越失真的偏置电路以及用于对所述模拟信号进行放大的场效应管，所述偏置电路与所述PA95高电压线性放大器的输出电源正极和输出电源负极电连接，所述偏置电路与所The current amplifying circuit includes a bias circuit for reducing the crossover distortion of the analog amplifying circuit and a field effect transistor for amplifying the analog signal, the bias circuit and the PA95 high-voltage linear amplifier The positive pole of the output power supply is electrically connected to the negative pole of the output power supply, and the bias circuit is connected with the
本发明的有益效果在于：具备结构简单，组成电路灵活，同时具备动态性能好，输出电流大等优点，可以实现对输出电压的数字控制。The beneficial effect of the invention is that it has the advantages of simple structure, flexible circuit composition, good dynamic performance, large output current, etc., and can realize digital control of the output voltage.
附图说明Description of drawings
图1为根据本发明的数字驱动电源一个实施例的电路模块图。Fig. 1 is a circuit block diagram of an embodiment of a digital driving power supply according to the present invention.
图2为根据本发明的数字驱动电源一个实施例的电路连接图。Fig. 2 is a circuit connection diagram of an embodiment of a digital driving power supply according to the present invention.
图3为根据本发明数字驱动电源一个实施例的系统控制图。Fig. 3 is a system control diagram of an embodiment of a digital driving power supply according to the present invention.
图4为根据本发明数字驱动电源一个实施例的测试图。Fig. 4 is a test diagram of an embodiment of a digital driving power supply according to the present invention.
具体实施方式detailed description
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及具体实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，而不构成对本发明的限制。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.
结合图1所示，本发明提供一种数字驱动电源，包括：As shown in Figure 1, the present invention provides a digital drive power supply, including:
数字控制电路1，用于将用户的输入转换为数字控制信号；A digital control circuit 1, used to convert user input into a digital control signal;
数模转换电路2，与所述数字控制电路1电连接，用于将所述数字控制信号转换为模拟信号；A digital-to-analog conversion circuit 2, electrically connected to the digital control circuit 1, for converting the digital control signal into an analog signal;
模拟放大电路3，与所述数模转换电路2电连接，用于将所述模拟信号进行放大得到驱动信号以供所述压电陶瓷使用。The analog amplifying circuit 3 is electrically connected with the digital-to-analog conversion circuit 2, and is used for amplifying the analog signal to obtain a driving signal for use by the piezoelectric ceramic.
数字控制电路1可以采用DSP数字控制电路1，可以将用户的输入转换为数字指令，以供数模转换电路2进行数模转换操作。The digital control circuit 1 can use a DSP digital control circuit 1, which can convert user input into digital instructions for the digital-to-analog conversion circuit 2 to perform digital-to-analog conversion operations.
对于数模转换电路2具体可以将数字控制电路1的数字指令转换为模拟电压，将模拟电压通过模拟放大电路3进行电压放大以驱动压电陶瓷。Specifically, the digital-to-analog conversion circuit 2 can convert the digital command of the digital control circuit 1 into an analog voltage, and the analog voltage is amplified by the analog amplifier circuit 3 to drive the piezoelectric ceramic.
模拟放大电路3包括：The analog amplifier circuit 3 includes:
高压放大电路以及电流放大电路，High voltage amplifying circuit and current amplifying circuit,
所述高压放大电路包括PA95高电压线性放大器；The high-voltage amplifying circuit includes a PA95 high-voltage linear amplifier;
所述电流放大电路包括用于减小所述模拟放大电路3交越失真的偏置电路以及用于对所述模拟信号进行放大的场效应管，所述偏置电路与所述PA95高电压线性放大器的输出电源正极和输出电源负极电连接，所述偏置电路与所述场效应管电连接，所述场效应管的电压输出端与所述压电陶瓷连接，所述PA95高电压线性放大器的电压输入端与所述数模转换电路2的输入端连接，所述偏置电路的正极接线端与所述PA95高电压线性放大器的电源正极连接，所述偏置电路的负极接线端与所述PA95高电压线性放大器的电源负极连接。The current amplifying circuit includes a bias circuit for reducing the crossover distortion of the analog amplifying circuit 3 and a field effect transistor for amplifying the analog signal, and the bias circuit is linear with the PA95 high voltage The positive pole of the output power supply of the amplifier is electrically connected to the negative pole of the output power supply, the bias circuit is electrically connected to the field effect tube, the voltage output terminal of the field effect tube is connected to the piezoelectric ceramic, and the PA95 high-voltage linear amplifier The voltage input terminal of the bias circuit is connected to the input terminal of the digital-to-analog conversion circuit 2, the positive pole terminal of the bias circuit is connected to the positive pole of the power supply of the PA95 high-voltage linear amplifier, and the negative pole terminal of the bias circuit is connected to the power supply of the PA95 high-voltage linear amplifier. Connect the negative pole of the power supply of the PA95 high voltage linear amplifier.
参图2所示，具体地说，高压放大电路使用PA95高电压线性放大器构成，PA95高电压线性放大器的同向输入端即引脚1作为控制电压输入，C1和R3是PA95高电压线性放大器组成的必备器件，分别用以进行频率补偿及输出电流限制，高压放大电路也可以使用其它同类型的PA系列高压运算放大器。电路的电流放大电路由D1、D2、R1、R2、R5、R6、M1及M2构成，R1、R2、R5、R6、D1及D2组成了MOS管偏置电路，主要用以减小电流放大电路的交越失真，M1及M2是大功率的场效应管，主要完成电流放大任务，电阻R7和R8组成了分压电阻网络，电阻R7和R8串联连接后一端接到输出电压VOUT上，另一端接地，电阻R7和R8的连接处与PA95高电压线性放大器的反向端连接。As shown in Figure 2, specifically, the high-voltage amplifying circuit is composed of a PA95 high-voltage linear amplifier. The non-inverting input terminal of the PA95 high-voltage linear amplifier, that is, pin 1, is used as the control voltage input, and C1 and R3 are composed of the PA95 high-voltage linear amplifier. The necessary devices are used for frequency compensation and output current limitation respectively. The high-voltage amplifier circuit can also use other PA series high-voltage operational amplifiers of the same type. The current amplification circuit of the circuit is composed of D1, D2, R1, R2, R5, R6, M1 and M2. R1, R2, R5, R6, D1 and D2 form the MOS tube bias circuit, which is mainly used to reduce the current amplification circuit. M1 and M2 are high-power field effect transistors, which mainly complete the task of current amplification. Resistors R7 and R8 form a voltage divider resistor network. After resistors R7 and R8 are connected in series, one end is connected to the output voltage VOUT, and the other end Grounding, the junction of resistors R7 and R8 is connected to the reverse end of the PA95 high-voltage linear amplifier.
由于压电陶瓷在电路上可以等效为一个μF级别的电容和MΩ级别的电阻并联，模拟放大器直接驱动大容量的电容会出现稳定性问题，为了解决这个问题，本发明采用了串联充放电电路4的技术特征，具体地，充放电电路4与模拟放大电路3电连接，充放电电路4可以为在压电陶瓷和模拟放大电路3之间串联一个大功率的电阻，可以有效的降低负载的惯性，增强系统的稳定性。Since piezoelectric ceramics can be equivalent to a μF-level capacitor connected in parallel with a MΩ-level resistor in the circuit, the analog amplifier directly drives a large-capacity capacitor to cause stability problems. In order to solve this problem, the present invention adopts a series charging and discharging circuit. 4, specifically, the charge and discharge circuit 4 is electrically connected to the analog amplifier circuit 3, and the charge and discharge circuit 4 can be a high-power resistor connected in series between the piezoelectric ceramic and the analog amplifier circuit 3, which can effectively reduce the load. Inertia enhances the stability of the system.
可选地，MOS管M1为IXTA10N60P高压MOS管，MOS管M2为IXTH10N60高压MOS管；电阻R2、R5、R7和R8为贴片电阻，电阻R3和R4为大功率电阻，电阻R1和R6为可变电阻，其变化范围为0-200k，D1和D2为1N4148二极管，高压放大电路中电容C1为陶瓷电容，高压放大电路的1脚和2脚分别为放大电路的同向输入端和反向输入端，4脚为高压放大电路的输出，5脚和6脚为高压放大电路的高压供电端，3脚为限流电阻连接端，7脚和8脚为补偿电容连接端；VOUT是高压放大电路的输出端；VCC为高压放大电路的正高电压供电，VSS为高压放大电路的负高电压供电。Optionally, the MOS tube M1 is an IXTA10N60P high-voltage MOS tube, and the MOS tube M2 is an IXTH10N60 high-voltage MOS tube; the resistors R2, R5, R7, and R8 are chip resistors, the resistors R3 and R4 are high-power resistors, and the resistors R1 and R6 are optional Varistor, the change range is 0-200k, D1 and D2 are 1N4148 diodes, capacitor C1 in the high-voltage amplifier circuit is a ceramic capacitor, pin 1 and pin 2 of the high-voltage amplifier circuit are the same input and reverse input of the amplifier circuit respectively Pin 4 is the output of the high-voltage amplifier circuit, pin 5 and pin 6 are the high-voltage power supply terminals of the high-voltage amplifier circuit, pin 3 is the connection terminal of the current limiting resistor, pin 7 and pin 8 are the connection terminals of the compensation capacitor; VOUT is the high-voltage amplifier circuit The output terminal; VCC is the positive high voltage power supply of the high voltage amplifier circuit, and VSS is the negative high voltage power supply of the high voltage amplifier circuit.
具体地，其中反馈电阻分别为R1＝150KΩ，R2＝10KΩ。Specifically, the feedback resistors are respectively R1=150KΩ and R2=10KΩ.
制作数字驱动电源时，可以首先焊接电路的电流放大级，将滑动电阻R1和R6调整到最大值，VCC和VSS分别接入150V和-150V的电压，调整滑动变阻器的电阻，使二极管D1和D2连接处的电压值为0；然后焊接高压放大电路及其附属电路(电阻电容等)，最后焊接其它部分的电路(充放电电路等)，以完成数字驱动电源的制作。When making a digital drive power supply, you can first weld the current amplification stage of the circuit, adjust the sliding resistors R1 and R6 to the maximum value, connect VCC and VSS to 150V and -150V voltages respectively, and adjust the resistance of the sliding rheostat to make the diodes D1 and D2 The voltage value at the connection is 0; then weld the high-voltage amplifier circuit and its auxiliary circuits (resistors and capacitors, etc.), and finally weld other parts of the circuit (charging and discharging circuits, etc.) to complete the production of the digital drive power supply.
上文中介绍了硬件结构，下面介绍一下如何进行利用上述数字驱动电源控制操作，下面进行具体介绍。The hardware structure has been introduced above, and how to use the above-mentioned digital drive power supply to control the operation is introduced below, and the specific introduction is given below.
K1由数字控制电路实现，它是用户输入的数字控制算法，该数字控制算法通过数模转换电路，完成数字到模拟的转换工作，数模转换电路在控制结构上可以作为保持器和滤波器K2，高压放大电路G1，电流放大电路G2，充放电电路G3，H(s)通过电阻网络实现，整个系统的传递函数可以用公式(1)来表示，公示中YN(s)表示输出电压VOUT。K1 is realized by a digital control circuit, which is a digital control algorithm input by the user. The digital control algorithm completes the conversion from digital to analog through the digital-to-analog conversion circuit. The digital-to-analog conversion circuit can be used as a keeper and filter K2 in the control structure. , the high-voltage amplifier circuit G1, the current amplifier circuit G2, the charge-discharge circuit G3, H(s) is realized through a resistor network, the transfer function of the whole system can be expressed by formula (1), and Y N (s) in the announcement represents the output voltage VOUT .
YY NN (( sthe s )) == GG 11 GG 22 GG 33 KK 11 KK 22 11 ++ GG 11 GG 22 Hh -- -- -- (( 11 ))
P＝(VCC-VSS)Is+VoIo (2)P=(VCC-VSS)I s +V o I o (2)
依据功耗的角度进行分析，高压放大电路的功耗可以由公式(2)来表述，其中，Is为电路的静态电流，Vo和Io分别为电路的输出电压和输出电流。从公式中可以看到如果能降低输出电流，就可以降低输出功耗，从而减小芯片总的功耗，使芯片发热量减小而使芯片受温度影响而带来的温漂减小。电流放大电路的输入电流小，可以有效的降低高压放大电路的功耗，以此提高系统的热稳定性。According to the analysis from the perspective of power consumption, the power consumption of the high-voltage amplifier circuit can be expressed by formula (2), where I s is the quiescent current of the circuit, V o and I o are the output voltage and output current of the circuit, respectively. It can be seen from the formula that if the output current can be reduced, the output power consumption can be reduced, thereby reducing the total power consumption of the chip, reducing the heat generation of the chip and reducing the temperature drift caused by the chip being affected by temperature. The input current of the current amplifying circuit is small, which can effectively reduce the power consumption of the high-voltage amplifying circuit, thereby improving the thermal stability of the system.
结合如4所示，压电陶瓷驱动中，在图3的控制结构中，H(s)反馈系数可以为16，这样就组成了放大倍数为16倍的数字驱动电源。在数字控制器中编写程序，通过数模转换电路发生微小的方波，使用示波器检测电压输出端的电压波形，得到波形图示如图4所示，分析输入电压和输出电压对应的波形图，通过观察可以得到数字驱动电源分辨率优于10mV。As shown in Figure 4, in the piezoelectric ceramic drive, in the control structure of Figure 3, the H(s) feedback coefficient can be 16, thus forming a digital drive power supply with a magnification of 16 times. Write a program in the digital controller, generate a small square wave through the digital-to-analog conversion circuit, use an oscilloscope to detect the voltage waveform at the voltage output terminal, and obtain a waveform diagram as shown in Figure 4, analyze the waveform diagram corresponding to the input voltage and output voltage, and pass It can be observed that the resolution of the digital driving power supply is better than 10mV.
本发明提供的数字驱动电源充分的考虑了系统的控制结构，依据热分析的原理而提出，具备结构简单，组成电路灵活，同时具备动态性能好，输出电流大等优点，可以实现对压电陶瓷的数字控制。The digital drive power supply provided by the present invention fully considers the control structure of the system, and is proposed based on the principle of thermal analysis. It has the advantages of simple structure, flexible circuit composition, good dynamic performance, and large output current. digital control.
以上所述本发明的具体实施方式，并不构成对本发明保护范围的限定。任何根据本发明的技术构思所作出的各种其他相应的改变与变形，均应包含在本发明权利要求的保护范围内。The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.
Claims (9)
1. a digital driving power, it is characterised in that for piezoelectric ceramics, described power supply includes:
Digital control circuit, for being converted to digital controlled signal by the input of user；
D/A converting circuit, electrically connects with described digital control circuit, for by described digital control letter Number be converted to analogue signal；
Analog amplify circuit, electrically connects with described D/A converting circuit, for described analogue signal being entered Row amplification obtains driving signal to use for described piezoelectric ceramics.
2. digital driving power as claimed in claim 1, it is characterised in that described power supply also includes:
Charge-discharge circuit, electrically connects with described analog amplify circuit, be used for stablizing described driving signal with For described piezoelectric ceramics.
3. digital driving power as claimed in claim 1 or 2, it is characterised in that described simulation is put Big circuit includes:
High voltage amplifier circuit and current amplification circuit,
Described high voltage amplifier circuit includes PA95 high voltage linear amplifier；
Described current amplification circuit includes the biased electrical for reducing described analog amplify circuit intermodulation distortion Road and for the field effect transistor that is amplified described analogue signal, described biasing circuit is with described The out-put supply positive pole of PA95 high voltage linear amplifier and out-put supply negative electricity connect, described biasing Circuit electrically connects with described field effect transistor, the voltage output end of described field effect transistor and described piezoelectric ceramics Connect.
4. digital driving power as claimed in claim 3, it is characterised in that described biasing circuit bag Include resistance R1, resistance R2, resistance R5, resistance R6, diode D1 and diode D2；
The voltage input end of described PA95 high voltage linear amplifier is defeated with described D/A converting circuit 2 Enter end to connect, the positive terminal of described biasing circuit and the electricity of described PA95 high voltage linear amplifier Source positive pole connects, the negative terminals of described biasing circuit and described PA95 high voltage linear amplifier Power cathode connects.
5. digital driving power as claimed in claim 4, it is characterised in that described biasing circuit is Metal-oxide-semiconductor biasing circuit, described field effect transistor is metal-oxide-semiconductor.
6. digital driving power as claimed in claim 4, it is characterised in that described resistance R2 and Described resistance R5 is Chip-R, described resistance R1 and described resistance R6 and is adjustable resistance, Described diode D1 and described diode D2 is Zener diode.
7. digital driving power as claimed in claim 6, it is characterised in that described Zener diode For 1N4148 diode, described metal-oxide-semiconductor is IXTH10N60 high-voltage MOS pipe.
8. digital driving power as claimed in claim 3, it is characterised in that described high voltage amplifier electricity The feedback factor on road is 16.
9. digital driving power as claimed in claim 2, it is characterised in that described charge-discharge circuit Including a resistance, described resistance and the series connection of described piezoelectric ceramics.
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