CN204349799U - Based on the Switching Power Supply of switch voltage-stabilizing type integrated circuit - Google Patents

A kind of Switching Power Supply based on switch voltage-stabilizing type integrated circuit, relate to a kind of Switching Power Supply, comprise switch voltage-stabilizing type integrated circuit, energy storage inductor, voltage stabilizing didoe D1, adjustable voltage resistance-feedback network, feed-forward capacitance circuit, filter circuit, described switch voltage-stabilizing type integrated circuit comprises pressurizer U1, adjustable voltage resistance-feedback network comprises adjustable resistance R1 and fixed resistance R2, feed-forward capacitance circuit comprises electric capacity C1, filter circuit comprises direct-current input power supplying filter circuit and DC voltage-stabilizing filter circuit, direct-current input power supplying filter circuit comprises the electrochemical capacitor C2 and electric capacity C3 that are connected in parallel, DC voltage-stabilizing filter circuit comprises electrochemical capacitor C4 and electric capacity C5.Switch power efficiency of the present utility model is high, can provide the output voltage of 1.2V ~ 30V and the output current of 3A; Also there is cost low, stable performance, simplicity of design, feature that volume is little, be particularly suitable for using when student and electrophile design and produce product.

Based on the Switching Power Supply of switch voltage-stabilizing type integrated circuit

Technical field

The utility model relates to a kind of Switching Power Supply, particularly a kind of Switching Power Supply based on switch voltage-stabilizing type integrated circuit.

Background technology

In the day electronic design and fabrication of electrophile, need to use electric power source pair of module deisgn product and carry out Power supply, the equipment not having power supply any all cannot work.In power supply at ordinary times uses, major part is all use linear power supply, but it is exactly that efficiency is low, heating is serious, the power of output is general lower that linear power supply can face a problem.And although Switching Power Supply has, and efficiency is high, reliablely and stablely feature, these Switching Power Supply major parts are all that cost is high, volume large, it is complicated to use, and are not suitable for student and electrophile uses.Also the EMC Design of some Switching Power Supply in circuit theory design and PCB goes back existing defects.The patent being CN103326558 as notification number provides a kind of high-efficiency high-power adjustable stabilized voltage supply, during its design, output voltage is adjustable, and be greater than 10V, therefore need in the feedback network of circuit, add a feed-forward capacitance, simultaneously in parallel with output voltage regulating resistance, this electric capacity can be that circuit is especially stable, and the patent that notification number is CN103326558 does not adopt this design.This patent also just illustrates in the selection of energy storage inductor selects powerful inductance that the inductance selecting to adopt Magnetic Shield designs is not described.Therefore there are some unreasonable parts in this patent in the design of circuit, if power will produce certain impact to the debugging of product to product.

In addition, in PCB design electromagnetic Compatibility Design unreasonable common be exactly that charger for mobile phone finds that when charging the phone the touch sensible of mobile phone screen is insensitive, be even often erroneous input.

Summary of the invention

The technical problems to be solved in the utility model is: the Switching Power Supply based on switch voltage-stabilizing type integrated circuit providing a kind of high efficiency, low cost, stable performance, with solve prior art exist efficiency low, cost is high, volume is large and the irrational weak point of circuit design.

The technical scheme solved the problems of the technologies described above is: a kind of Switching Power Supply based on switch voltage-stabilizing type integrated circuit, comprise switch voltage-stabilizing type integrated circuit, energy storage inductor L1, energy storage inductor L2, voltage stabilizing didoe D1, adjustable voltage resistance-feedback network, feed-forward capacitance circuit, filter circuit

Described switch voltage-stabilizing type integrated circuit comprises pressurizer U1, and this pressurizer U1 model is LM2596;

Described adjustable voltage resistance-feedback network comprises adjustable resistance R1 and fixed resistance R2,

Described feed-forward capacitance circuit comprises electric capacity C1,

Described filter circuit comprises direct-current input power supplying filter circuit and DC voltage-stabilizing filter circuit, and wherein direct-current input power supplying filter circuit comprises the electrochemical capacitor C2 and electric capacity C3 that are connected in parallel, and DC voltage-stabilizing filter circuit comprises electrochemical capacitor C4 and electric capacity C5;

Described pressurizer U1 the 1st pin is connected with the direct-current input power supplying positive pole being serially connected with energy storage inductor L1, the 3rd pin earth connection GND of pressurizer U1, the external PWM waveform generator of 5th pin or earth connection GND, 2nd pin of pressurizer U1 connects the negative electrode of voltage stabilizing didoe D1 and one end of energy storage inductor L2, the positive pole of another termination DC voltage-stabilizing out-put supply of energy storage inductor L2, the plus earth line GND of voltage stabilizing didoe D1; 4th pin of pressurizer U1 connects one end of adjustable resistance R1 and fixed resistance R2, the positive pole of another termination DC voltage-stabilizing out-put supply of adjustable resistance R1, the other end earth connection GND of fixed resistance R2; Described electric capacity C1 is connected in parallel on the two ends of adjustable resistance R1, and described electrochemical capacitor C2 is connected with the direct-current input power supplying positive pole being serially connected with energy storage inductor L1 respectively with one end of electric capacity C3, and electrochemical capacitor C2 is connected with ground wire GND respectively with the other end of electric capacity C3; One end of electrochemical capacitor C4, electric capacity C5 is connected with the positive pole of DC voltage-stabilizing out-put supply respectively, and the other end of electrochemical capacitor C4, electric capacity C5 is connected with ground wire GND respectively.

Further technical scheme of the present utility model is: described pressurizer U1 model is LM2596ADJ.

Further technical scheme more of the present utility model is: described energy storage inductor L1, energy storage inductor L2 all adopt magnetic screen type energy storage inductor.

Owing to adopting said structure, the Switching Power Supply based on switch voltage-stabilizing type integrated circuit of the utility model compared with prior art, has following beneficial effect:

1. efficiency is high:

Because the utility model comprises switch voltage-stabilizing type integrated circuit, energy storage inductor L1, voltage stabilizing didoe D1, adjustable voltage resistance-feedback network, feed-forward capacitance circuit, filter circuit, that design adopts is special switching power source chip LM2596ADJ, switching frequency during its work can reach 150KHz, the switching device that can be controlled pressurizer inside by external pwm pulse carries out switched voltage output and has the little feature of internal power consumption making its efficiency reach more than 70%, higher than the efficiency of linear power supply, the output voltage that simultaneously 1.2V ~ 30V can be provided adjustable and the output current of 3A, wider range of application can be had providing on power parameter.

2. cost is low:

The model adopted due to pressurizer of the present utility model is LM2596ADJ, this LM2596ADJ has that cost is low, the simple feature of circuit design, only need add a small amount of electronic component in periphery and just can form a complete switching power circuit, make the simplicity of design of circuit, cost low.Therefore, the utility model is in circuit design and make simple, and production cost is lower, is convenient to universal use.

3. stable performance:

Because output voltage of the present utility model is adjustable, therefore, the utility model is parallel with the feed-forward capacitance circuit be made up of electric capacity C1 at the two ends of adjustable resistance R1, thus can make output voltage stabilization; In addition, energy storage inductor L1, L2 of the present utility model adopt the energy storage inductor having Magnetic Shield designs, more reasonable in the design of circuit, thus the phenomenons such as the touch sensible occurred when mobile phone can be avoided to charge is insensitive, erroneous input, simultaneously, circuit design considers the design of Electro Magnetic Compatibility, the impact of power supply on power consumption equipment is few, concrete element employs feed-forward capacitance, adopts the energy storage inductor of magnetic screen, therefore, for the Switching Power Supply of low cost, the design has larger advantage in universal use.

4. simplicity of design, volume are little:

The model adopted due to pressurizer of the present utility model is LM2596ADJ; this LM2596ADJ is that one exports can reach 3A at electric current; output voltage reaches 1.2 ~ 37V; input voltage can up to the rearrangeable switch voltage regulation type integrated circuit of 40V; its inner integrated protective circuit, current limit, Thermal shutdown circuit etc.; simultaneously; it also has, and cost is low, the simple feature of circuit design; only need add a small amount of electronic component in periphery and just can form a complete switching power circuit, make the simplicity of design of circuit, volume little.

5. applied widely:

The model adopted due to pressurizer of the present utility model is LM2596ADJ, this LM2596ADJ integrated circuit has the input and output voltage of high width, more occasion can be adapted to use, be particularly suitable for a kind of good power supply when student and electrophile design and produce product and select.

Below, in conjunction with the accompanying drawings and embodiments the technical characteristic of the Switching Power Supply based on switch voltage-stabilizing type integrated circuit of the utility model is further described.

Accompanying drawing explanation

Fig. 1 is the circuit theory diagrams of the Switching Power Supply based on switch voltage-stabilizing type integrated circuit of the utility model.

The thick line that adds in Fig. 1 adopts the wire diameter that width is large in PCB layout.

Embodiment

Embodiment one:

Based on a Switching Power Supply for switch voltage-stabilizing type integrated circuit, comprise switch voltage-stabilizing type integrated circuit, energy storage inductor L1, energy storage inductor L2, voltage stabilizing didoe D1, adjustable voltage resistance-feedback network, feed-forward capacitance circuit, filter circuit.

Described switch voltage-stabilizing type integrated circuit comprises pressurizer U1, and this pressurizer U1 model is LM2596ADJ;

Described energy storage inductor L1, energy storage inductor L2 all adopt magnetic screen type energy storage inductor.

Voltage stabilizing didoe D1 adopts IN5825 fast recovery diode;

Described adjustable voltage resistance-feedback network comprises adjustable resistance R1 and fixed resistance R2, can change dividing ratios by changing adjustable resistance R1;

Described feed-forward capacitance circuit comprises electric capacity C1,

Described filter circuit comprises direct-current input power supplying filter circuit and DC voltage-stabilizing filter circuit, and wherein direct-current input power supplying filter circuit comprises the electrochemical capacitor C2 and electric capacity C3 that are connected in parallel, and DC voltage-stabilizing filter circuit comprises electrochemical capacitor C4 and electric capacity C5; These circuit and element are all that the stability in order to improve circuit carries out designing.

Described pressurizer U1 the 1st pin is connected with direct-current input power supplying (35V) positive pole being serially connected with energy storage inductor L1, the 3rd pin earth connection GND of pressurizer U1, the external PWM waveform generator of 5th pin, also can earth connection GND, 2nd pin of pressurizer U1 connects the negative electrode of voltage stabilizing didoe D1 and one end of energy storage inductor L2, the positive pole of another termination DC voltage-stabilizing out-put supply (1.2V ~ 30V) of energy storage inductor L2, the plus earth line GND of voltage stabilizing didoe D1; 4th pin of pressurizer U1 connects one end of adjustable resistance R1 and fixed resistance R2, the positive pole of another termination DC voltage-stabilizing out-put supply of adjustable resistance R1, the other end earth connection GND of fixed resistance R2; Described electric capacity C1 is connected in parallel on the two ends of adjustable resistance R1, and described electrochemical capacitor C2 is connected with the direct-current input power supplying positive pole being serially connected with energy storage inductor L1 respectively with one end of electric capacity C3, and electrochemical capacitor C2 is connected with ground wire GND respectively with the other end of electric capacity C3; One end of electrochemical capacitor C4, electric capacity C5 is connected with the positive pole of DC voltage-stabilizing out-put supply respectively, and the other end of electrochemical capacitor C4, electric capacity C5 is connected with ground wire GND respectively.

In PCB layout, feedback line will away from inductance, and the thick line in circuit accompanying drawing must be short, best property-line shielding, and adjustable resistance R1, the fixed resistance R2 of regulation output voltage will near the 4th pin of pressurizer.In a switching regulator, PCB layout is also extremely important, switching current and loop inductance closely related, the transient voltage produced by this loop inductance often causes many problems.Make that this induction is minimum, ground wire forms loop, the thick line portion in FIG will be printed wider on PCB plate, and short as much as possible.In order to obtain best effect, outward element will be positioned as close to switching mode integrated circuit, best property-line shielding or single-point grounding.