阅读说明：本技术 一种不需要辅助电源的供电电路 (Power supply circuit without auxiliary power supply ) 是由 马群 于 2018-09-26 设计创作，主要内容包括：本发明公开了一种不需要辅助电源的供电电路,包括高压启动电路、反激供电电路和正激供电电路,所述高压启动电路内含有并联电阻R36、R78、并联电阻R71、R121、并联电阻R55、R56、三极管Q9、Q6、二极管D10和控制芯片U3；所述反激供电电路内含有变压器反激绕组T1-A、二极管D7和电容C8；所述正激供电电路内含有变压器反激绕组T1-B、二极管D8、电容C14、三极管Q4、Q5和稳压管Z7。本不需要辅助电源的供电电路,通过高压启动电路、反激供电电路和正激供电电路为线路提供有效的供电,相比传统的独立辅助电源供电,能大大减少线路的物料、节约设计空间、降低设计成本。(The invention discloses a power supply circuit without an auxiliary power supply, which comprises a high-voltage starting circuit, a flyback power supply circuit and a forward power supply circuit, wherein the high-voltage starting circuit contains parallel resistors R36, R78, parallel resistors R71 and R121, parallel resistors R55 and R56, triodes Q9 and Q6, a diode D10 and a control chip U3; the flyback power supply circuit comprises a transformer flyback winding T1-A, a diode D7 and a capacitor C8; the forward power supply circuit comprises a transformer flyback winding T1-B, a diode D8, a capacitor C14, a triode Q4, a triode Q5 and a voltage regulator tube Z7. This power supply circuit that does not need auxiliary power source provides effectual power supply for the circuit through high-pressure starting circuit, flyback power supply circuit and forward power supply circuit, compares traditional independent auxiliary power source power supply, the material of the circuit that can significantly reduce, saving design space, reduction design cost.)

1. The utility model provides a need not auxiliary power supply's supply circuit, includes high-voltage starting circuit (1), flyback power supply circuit (2) and forward supply circuit (3), its characterized in that: the high-voltage starting circuit (1) comprises parallel resistors R36, R78, parallel resistors R71, R121, parallel resistors R55, R56, triodes Q9, Q6, a diode D10 and a control chip U3, wherein the parallel resistors R36 and R78 are connected with high-voltage direct current HV +, the parallel resistors R71 and R121 are connected with the parallel resistors R36 and R78, the parallel resistors R55 and R56 are connected with the parallel resistors R71 and R121, a pin 3 of the triode Q9 is connected with the parallel resistors R55 and R56, a pin 2 of the triode Q9 is connected with an input end of a pin 3 of the triode Q6, a pin 1 of the triode Q9 is connected with a pin 2 of the diode D10, a pin 3 of the diode D10 is connected with a VCC network, a pin 2 of the triode Q6 is connected with a pin 8 of the control chip U3 in series, and a pin 1 of the triode Q6 is grounded; the flyback power supply circuit (2) comprises a transformer flyback winding T1-A, a diode D7 and a capacitor C8, wherein a pin 4 of the transformer flyback winding T1-A is connected with a negative electrode output end of the capacitor C8, a pin 6 of the transformer flyback winding T1-A is connected with a diode D7, a diode D7 is connected with parallel resistors R28 and R27, and an anode input end of the capacitor C8 and the parallel resistors R28 and R27 are connected with a VCC network; the forward power supply circuit (3) comprises a transformer forward winding T1-B, a diode D8, a capacitor C14, triodes Q4 and Q5 and a voltage stabilizing tube Z7, wherein a pin 3 of the transformer forward winding T1-B is connected with the diode D8, a diode D8 is connected with a pin 2 of the triode Q4, a pin 4 of the transformer forward winding T1-B is connected with input ends of a pin 1 and a pin 2 of the voltage stabilizing tube Z7, a pin 3 of the voltage stabilizing tube Z7 is connected with a pin 2 of the triode Q5, a pin 3 of the triode Q5 is connected with an input end of a pin 2 of the triode Q4, a pin 1 of the triode Q5 is connected with a pin 1 of the triode Q4, the capacitor C14 is connected in parallel to one side of the transformer forward winding T1-B, and a pin 3 of the triode Q4 is connected with the diode D58.

2. A power supply circuit requiring no auxiliary power supply as claimed in claim 1, wherein: the model of the control chip U3 is UC3843BD1R 2G.

3. A power supply circuit requiring no auxiliary power supply as claimed in claim 1, wherein: pin 3 of the triode Q6 is connected with series resistors R85, R81 and R79, and the series resistors R85, R81 and R79 are connected with the pin 3 input end of the triode Q9.

4. A power supply circuit requiring no auxiliary power supply as claimed in claim 1, wherein: and a pin 7 of the control chip U3 is connected with a power supply VCC.

Technical Field

The invention relates to the technical field of switching power supplies, in particular to a power supply circuit without an auxiliary power supply.

Background

The method for supplying power to the power circuit widely used at present adopts an independent auxiliary power supply for supplying power, and although the method is reliable, the method needs more devices such as a control chip, a switching tube, a rectifying tube, a transformer, a filter and the like, which is almost equivalent to a brand-new small power module, so that the cost of the devices is greatly improved.

Disclosure of Invention

The invention aims to provide a power supply circuit without an auxiliary power supply, which can provide effective power supply for a circuit through a high-voltage starting circuit, a flyback power supply circuit and a forward power supply circuit.

In order to achieve the purpose, the invention provides the following technical scheme: a power supply circuit without an auxiliary power supply comprises a high-voltage starting circuit, a flyback power supply circuit and a forward power supply circuit, wherein the high-voltage starting circuit comprises parallel resistors R36, R78, parallel resistors R71, R121, parallel resistors R55, R56, triodes Q9, Q6, a diode D10 and a control chip U3, wherein the parallel resistors R36 and R78 are connected with high-voltage direct current HV +, the parallel resistors R71 and R121 are connected with parallel resistors R36 and R78, the parallel resistors R55 and R56 are connected with parallel resistors R56 and R121, a pin 3 of the triode Q56 is connected with the parallel resistors R56 and R56, a pin 2 of the triode Q56 is connected with an input end of a pin 3 of the triode Q56, a pin 1 of the triode Q56 is connected with a pin 2 of the diode D56, a pin 1 of the diode D56 is connected with a VCC network, and a pin 2 of the triode Q56 is connected in series with a resistor R112 and a pin 8 of the control chip U56 and a pin GN; the flyback power supply circuit comprises a transformer flyback winding T1-A, a diode D7 and a capacitor C8, wherein a pin 4 of the transformer flyback winding T1-A is connected with a negative electrode output end of the capacitor C8, a pin 6 of the transformer flyback winding T1-A is connected with a diode D7, a diode D7 is connected with parallel resistors R28 and R27, and an anode input end of the capacitor C8 and the parallel resistors R28 and R27 are connected with a VCC network; the forward power supply circuit comprises a transformer forward winding T1-B, a diode D8, a capacitor C14, triodes Q4 and Q5 and a voltage stabilizing tube Z7, wherein a pin 3 of the transformer forward winding T1-B is connected with a diode D8, a diode D8 is connected with a pin 2 of a triode Q4, a pin 4 of the transformer forward winding T1-B is connected with input ends of a pin 1 and a pin 2 of a voltage stabilizing tube Z7, a pin 3 of the voltage stabilizing tube Z7 is connected with a pin 2 of the triode Q5, a pin 3 of the triode Q5 is connected with an input end of a pin 2 of the triode Q4, a pin 1 of the triode Q5 is connected with a pin 1 of the triode Q4, the capacitor C14 is connected in parallel to one side of the transformer forward winding T1-B, and a pin 3 of the triode Q4 is connected with a diode D58.

Preferably, the model of the control chip U3 is UC3843BD1R 2G.

Preferably, a pin 3 of the triode Q6 is connected with series resistors R85, R81 and R79, and the series resistors R85, R81 and R79 are connected with an input end of a pin 3 of the triode Q9.

Preferably, pin 7 of the control chip U3 is connected to a power supply VCC.

Compared with the prior art, the invention has the following beneficial effects:

the power supply circuit without the auxiliary power supply can provide effective power supply for the circuit by directly getting power from the winding of the transformer through simple processing, and compared with the traditional independent auxiliary power supply, the power supply circuit can greatly reduce the materials of the circuit, save the design space and reduce the design cost; therefore, compared with the traditional online high-voltage starting circuit, the circuit can cut off the starting current after the control chip is started, and the online loss of the starting circuit is greatly reduced.

Drawings

FIG. 1 is a high voltage start-up circuit diagram of the present invention;

fig. 2 is a flyback power supply circuit diagram of the present invention;

FIG. 3 is a forward power supply circuit diagram of the present invention;

FIG. 4 is a circuit diagram of the present invention.

In the figure: 1. a high voltage start-up circuit; 2. a flyback power supply circuit; 3. a forward power supply circuit.

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.

Referring to fig. 1-4, a power supply circuit without auxiliary power supply comprises a high voltage starting circuit 1, a flyback power supply circuit 2 and a forward power supply circuit 3, wherein the high voltage starting circuit 1 contains parallel resistors R, parallel resistors R, R121, parallel resistors R, triodes Q, a diode D and a control chip U with model UC3843BD1R2, wherein the parallel resistors R, R are connected with a high voltage dc HV +, the parallel resistors R, R121 are connected with the parallel resistors R, R are connected with the parallel resistors R, R121, a pin 3 of the triode Q is connected with the parallel resistors R, a pin 2 of the triode Q is connected with an input terminal of the pin 3 of the triode Q, a pin 1 of the triode Q is connected with a pin 2 of the diode D, a pin 1 of the diode D is connected with a VCC network, a pin 3 of the triode Q is connected with series resistors R, R are connected with an input terminal of the pin 3 of the triode Q, a pin 2 of the triode Q6 is connected with a resistor R112 in series and is connected with a pin 8 of the control chip U3, a pin 7 of the control chip U3 is connected with a power supply VCC, and a pin 1 of the triode Q6 is grounded GND;

the working process of the circuit is as follows: high-voltage direct current HV + passes through high-voltage starting resistors such as resistors R36, R71 and R55 and is connected to a VCC network from a pin 1 of a triode Q9; the control chip U3 is powered on to start working, the pin 8 generates +5V reference voltage to turn on the triode Q6, and at the moment, the triode Q9 is cut off to finish starting work;

the flyback power supply circuit 2 comprises a transformer flyback winding T1-A, a diode D7 and a capacitor C8, wherein a pin 4 of the transformer flyback winding T1-A is connected with a negative electrode output end of the capacitor C8, a pin 6 of the transformer flyback winding T1-A is connected with a diode D7, a diode D7 is connected with parallel resistors R28 and R27, and an anode input end of the capacitor C8 and the parallel resistors R28 and R27 are connected with a VCC network;

the working process of the circuit is as follows: after the control chip U3 works, the transformer flyback winding T1-A starts to generate electromotive force to generate square wave voltage, and the square wave voltage is rectified by a diode D7 and filtered by a capacitor C8 and then is converged to a VCC network to provide required voltage for a circuit;

the forward power supply circuit 3 is internally provided with a transformer forward winding T1-B, a diode D8, a capacitor C14, triodes Q4 and Q5 and a voltage stabilizing tube Z7, wherein a pin 3 of the transformer forward winding T1-B is connected with a diode D8, a diode D8 is connected with a pin 2 of a triode Q4, a pin 4 of the transformer forward winding T1-B is connected with input ends of a pin 1 and a pin 2 of a voltage stabilizing tube Z7, a pin 3 of the voltage stabilizing tube Z7 is connected with a pin 2 of the triode Q5, a pin 3 of the triode Q5 is connected with an input end of a pin 2 of the triode Q4, a pin 1 of the triode Q5 is connected with a pin 1 of the triode Q4, the capacitor C14 is connected in parallel to one side of the transformer forward winding T1-B, and a pin 3 of the triode Q4 is connected with;

the working process of the circuit is as follows: after the control chip U3 works, electromotive force starts to generate square wave voltage on a forward winding T1-B of the transformer, the square wave voltage is rectified by a diode D8 and filtered by a capacitor C14, a Darlington tube is formed by triodes Q4 and Q5, a voltage regulator tube Z7 is used as reference voltage to stabilize the output voltage of the triode Q4, and the output voltage of the triode Q4 is converged to a VCC network by a diode D10.

The power supply circuit without the auxiliary power supply can provide effective power supply for the circuit by directly getting power from the winding of the transformer through simple processing, and compared with the traditional independent auxiliary power supply, the power supply circuit can greatly reduce the materials of the circuit, save the design space and reduce the design cost; therefore, compared with the traditional online high-voltage starting circuit, the circuit can cut off the starting current after the control chip is started, and the online loss of the starting circuit is greatly reduced.

In summary, the following steps: this power supply circuit that does not need auxiliary power source provides effectual power supply for the circuit through high-pressure starting circuit 1, flyback power supply circuit 2 and forward power supply circuit 3, compares traditional independent auxiliary power source power supply, can the significantly reduced material of circuit, practice thrift the design space, reduce design cost, therefore the effectual problem of having solved among the prior art.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.