CN204721217U - Switching power circuit and electronic equipment - Google Patents
Switching power circuit and electronic equipment Download PDFInfo
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- CN204721217U CN204721217U CN201520356342.7U CN201520356342U CN204721217U CN 204721217 U CN204721217 U CN 204721217U CN 201520356342 U CN201520356342 U CN 201520356342U CN 204721217 U CN204721217 U CN 204721217U
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Abstract
The utility model discloses a kind of switching power circuit and electronic equipment.This switching power circuit, comprises ac input end, rectification module, power switching modules, DC voltage-stabilizing module, filter capacitor and drive control module, and the input of rectification module connects ac input end, and the input of DC voltage-stabilizing module is through filter capacitor ground connection; The first input end of drive control module receives the input of reference voltage, and the second input of drive control module connects the output of rectification module, and the output of driver module connects power switching modules; Drive control module is used for the voltage of the voltage of its first input end and its second input to compare, and exports corresponding level signal to power switching modules according to comparative result, to control power switching modules break-make.The invention also discloses a kind of electronic equipment, it comprises switching power circuit.The utility model switching power circuit and electronic equipment, without the need to using transformer transformation in circuit, and without the need to high voltage bearing device for power switching, significantly reduce the cost of circuit.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to switching power circuit and electronic equipment.
Background technology
At present, Switching Power Supply has been applied in Most electronic equipment, and for improving the market competitiveness of electronic equipment, each production commercial city promotes the scheme of the cost performance of electronic equipment in demand.Existing switching power circuit, be usually all adopt through first rectification, after the mode of step-down.The deficiency that this kind of switching power circuit exists is: the high-pressure section of what it utilized is alternating voltage, need to carry out step-down by transformer, and the device for power switching in circuit needs high pressure resistant, because the use of transformer and high voltage bearing device for power switching causes the cost of this kind of switching power circuit very high, and then the cost of electronic equipment is caused to remain high.
Therefore, a kind of switching power circuit scheme with low cost is proposed, highly significant.
Utility model content
Main purpose of the present utility model is a kind of switching power circuit and electronic equipment, is intended to solve the high technical problem of electronic equipment cost.
For achieving the above object, the utility model provides a kind of switching power circuit, and described switching power circuit comprises ac input end, rectification module, power switching modules, DC voltage-stabilizing module, filter capacitor and drive control module, wherein:
The input of described rectification module connects described ac input end, and the output of described rectification module connects the input of described DC voltage-stabilizing module through described power switching modules;
The input of described DC voltage-stabilizing module is through described filter capacitor ground connection, and the output of described DC voltage-stabilizing module is as the power output end of described switching power circuit;
The first input end of described drive control module receives the input of reference voltage, and the second input of described drive control module connects the output of described rectification module, and the output of described driver module connects described power switching modules; Described drive control module is used for the voltage of the voltage of its first input end and its second input to compare, and exports corresponding level signal to described power switching modules, to control described power switching modules break-make according to comparative result.
Preferably, described switching power circuit also comprises division module, and the second input of described drive control module connects the output of described rectification module through described division module.
Preferably, described division module comprises the first resistance and the second resistance, described first resistance is connected between the second input of described drive control module and the output of described rectification module, one end of described second resistance connects the second input of described drive control module, the other end ground connection of described second resistance.
Preferably, described power switching modules is the first NPN type triode, the collector electrode of described first NPN type triode connects the output of described rectification module, the emitter of described first NPN type triode connects the input of described DC voltage-stabilizing module, and the base stage of described first NPN type triode connects the output of described drive control module.
Preferably, described rectification module is full-wave rectifying circuit, the ac input end of described full-wave rectifying circuit is the input of described rectification module, and the direct current output plus terminal of described full-wave rectifying circuit is the output of described rectification module, and the direct current of described full-wave rectifying circuit exports negativing ending grounding.
Preferably, described drive control module comprises comparator and drive circuit, two inputs of described comparator are respectively first input end and second input of described drived control block module, the output of described comparator connects the signal input part of described drive circuit, and the signal output part of described drive circuit is the output of described drive control module.
Preferably, described drive circuit comprises the second NPN type triode, photoelectrical coupler, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, wherein,
One end of described 3rd resistance is as the signal input part of described drive circuit, and the other end of described 3rd resistance connects the base stage of described second NPN type triode and one end of described 4th resistance, and the other end of described 4th resistance connects power supply;
The input positive pole of described photoelectrical coupler connects power supply, and the input negative pole of described photoelectrical coupler connects the collector electrode of described second NPN type triode, the grounded emitter of described second NPN type triode through described 5th resistance;
The output cathode of described photoelectrical coupler connects the output of described rectification module through described 6th resistance, the output negative pole of described photoelectrical coupler as described drive circuit signal output part and through described 7th grounding through resistance.
In addition, for achieving the above object, the utility model also provides a kind of electronic equipment, and described electronic equipment comprises switching power circuit as above.
The utility model switching power circuit and electronic equipment, the power switching modules only conducting when the voltage of the output of rectification module is less than or equal to critical voltage value, be greater than this critical voltage value at the voltage of the output of rectification module to disconnect, thus effectively make use of the low-pressure section of the voltage that rectification module exports and change into electric energy, due to switching power circuit application is the low-pressure section of power supply, without the need to using transformer transformation in circuit, and without the need to high voltage bearing device for power switching, significantly reduce the cost of circuit.
Accompanying drawing explanation
Fig. 1 is the module diagram of the utility model switching power circuit first embodiment;
Fig. 2 is the circuit diagram of the utility model switching power circuit second embodiment.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of switching power circuit, with reference to Fig. 1, in the present embodiment, this switching power circuit comprises ac input end AC-in, rectification module 10, power switching modules 20, DC voltage-stabilizing module 30, filter capacitor 50 and drive control module 40, wherein:
The input of rectification module 10 connects ac input end AC-in, the output of rectification module 10 connects the input of DC voltage-stabilizing module 30 through power switching modules 20, ac input end AC-in is for connecting AC power to receive alternating current input, and the alternating current that its input inputs is converted to direct current and exports from its output by rectification module 10; The input of DC voltage-stabilizing module 30 is through filter capacitor 50 ground connection, and the output of DC voltage-stabilizing module 30 is as the power output end Vout of switching power circuit; The first input end Vref of drive control module 40 receives the input of reference voltage, and the second input of drive control module 40 connects the output of rectification module 10, and the output of driver module connects power switching modules 20; Drive control module 40 for the voltage of its first input end Vref and the voltage of its second input being compared, and exports corresponding level signal to power switching modules 20 according to comparative result, to control power switching modules 20 break-make.
The operation principle of the switching power circuit of the present embodiment is: the ac voltage rectifier that ac input end AC-in inputs is become direct voltage output by rectification module 10, and the d. c. voltage signal that rectification module 10 exports is steamed bun ripple signal; The voltage of its second input compares with the voltage (i.e. reference voltage) of first input end Vref by drive control module 40, reference voltage correspond to a critical voltage value, and reference voltage can be equal with the corresponding relation of critical voltage value or become multiple proportion.When the voltage of the second input of drive control module 40 is greater than this critical voltage value, drive control module 40 controls power switching modules 20 to be ended, when the voltage of the second input of drive control module 40 is less than or equal to this critical voltage value, drive control module 40 controls power switching modules 20 conducting, then the voltage (such as 12V, 5V) of commutating voltage stable output after DC voltage-stabilizing module 30 of the output output of rectification module 10 is powered, the voltage signal exported due to the output of rectification module 10 is steamed bun ripple signal, namely voltage swing is change, therefore power switching modules 20 meeting alternate conduction and disconnection, the voltage signal that the input of DC voltage-stabilizing module 30 receives is desultory voltage, during power switching modules 20 conducting, the voltage signal exported by filter capacitor 50 pairs of rectification modules 10 carries out energy storage (namely charging to filter capacitor 50), make when power switching modules 20 disconnects, by the supplying power for input end of filter capacitor 50 pairs of DC voltage-stabilizing modules 30, ensure that the output of DC voltage-stabilizing module 30 can continue output voltage.
The switching power circuit that the present embodiment proposes, power switching modules 20 is the conducting when the voltage of the output of rectification module 10 is less than or equal to critical voltage value only, be greater than this critical voltage value at the voltage of the output of rectification module 10 to disconnect, thus effectively make use of the low-pressure section of the voltage that rectification module 10 exports and change into electric energy, due to the low-pressure section of the power supply of the present embodiment switching power circuit application, without the need to using transformer transformation in circuit, and without the need to high voltage bearing device for power switching, significantly reduce the cost of circuit.
Further, the voltage signal exported due to rectification module 10 is steamed bun ripple, voltage in order to avoid the second input of drive control module 40 is excessive and affect the job stability of drive control module 40, therefore, the switching power circuit of the present embodiment also comprises division module, and the second input of drive control module 40 connects the output of rectification module 10 through division module.Second input of drive control module 40 is connected by the output of division module with rectification module 10, the voltage of the second input of drive control module 40 is made to be the dividing potential drop of voltage that rectification module 10 exports, effectively reduce the voltage of the second input of drive control module 40, ensure that the steady operation of drive control module 40.
Further, with reference to Fig. 2, the division module of the present embodiment comprises the first resistance R1 and the second resistance R2, first resistance R1 is connected between the second input of drive control module 40 and the output of rectification module 10, one end of second resistance R2 connects the second input of drive control module 40, the other end ground connection of the second resistance R2.The voltage of the second input of drive control module 40 is the dividing potential drop on the second resistance R2.
Further, with reference to Fig. 2, the power switching modules 20 of the present embodiment is preferably the first NPN type triode Q1, the collector electrode of the first NPN type triode Q1 connects the output of rectification module 10, the emitter of the first NPN type triode Q1 connects the input of DC voltage-stabilizing module 30, and the base stage of the first NPN type triode Q1 connects the output of drive control module 40.It should be noted that, in the present embodiment, the first NPN type triode Q1 can replace with other device identical with its function or switching tube, such as, and metal-oxide-semiconductor, IGBT pipe etc.
Further, the rectification module 10 of the present embodiment is preferably full-wave rectifying circuit, the ac input end of full-wave rectifying circuit is the input of rectification module 10, and the direct current output plus terminal of full-wave rectifying circuit is the output of rectification module 10, and the direct current of full-wave rectifying circuit exports negativing ending grounding.
Further, with reference to Fig. 2, the drive control module 40 of the present embodiment comprises comparator 41 and drive circuit 42, two inputs of comparator 41 are respectively first input end Vref and second input of drived control block module, the output of comparator 41 connects the signal input part of drive circuit 42, and the signal output part of drive circuit 42 is the output of drive control module 40.Drive circuit 42 comprises the second NPN type triode Q2, photoelectrical coupler U1, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7, wherein, one end of 3rd resistance R3 is as the signal input part of drive circuit 42, the other end of the 3rd resistance R3 connects the base stage of the second NPN type triode Q2 and one end of the 4th resistance R4, and the other end of the 4th resistance R4 connects power supply VCC; The input positive pole (referring to the positive pole of the light-emitting diode of photoelectrical coupler U1) of photoelectrical coupler U1 connects power supply VCC, the input negative pole (referring to the negative pole of the light-emitting diode of photoelectrical coupler U1) of photoelectrical coupler U1 connects the collector electrode of the second NPN type triode Q2, the grounded emitter of the second NPN type triode Q2 through the 5th resistance R5; The output cathode (referring to the collector electrode of the phototriode of photoelectrical coupler U1) of photoelectrical coupler U1 connects the output of rectification module 10 through the 6th resistance R6, the output negative pole (referring to the emitter of the phototriode of photoelectrical coupler U1) of photoelectrical coupler U1 as drive circuit 42 signal output part and through the 7th resistance R7 ground connection.It should be noted that, in the present embodiment, the second NPN type triode Q2 can replace with other device identical with its function, such as, and metal-oxide-semiconductor, IGBT pipe etc.; Be with photoelectrical coupler U1 for preference in the present embodiment, photoelectrical coupler U1 can replace with the isolation drive device realizing identical function with it, such as, and relay, pulse transformer etc.
The operation principle of drive control module 40 is: the voltage of first input end Vref and the voltage compare of the second input; 1, when the voltage of the second input is greater than the voltage of the second input, the output output low level signal of comparator 41, power supply VCC successively through the 4th resistance R4, the 3rd resistance R3 conducting, thus makes the base stage of the second NPN type triode Q2 be low level, the second NPN type triode Q2 cut-off; And then, the light-emitting diode not conducting of photoelectrical coupler U1, the phototriode cut-off of photoelectrical coupler U1, the base stage of the first NPN type triode Q1 is low level, first NPN type triode Q1 cut-off, then the output of rectification module 10 and the output of DC voltage-stabilizing module 30 disconnect.2, when the voltage of input is less than or equal to the voltage of first input end Vref, the output of comparator 41 exports high level, and namely the base stage of the second NPN type triode Q2 is high level, the second NPN type triode Q2 conducting; And then the LEDs ON of photoelectrical coupler U1, lumination of light emitting diode makes the phototriode conducting of photoelectrical coupler U1, the output of rectification module 10 successively through the phototriode of the 6th resistance R6, photoelectrical coupler U1 and the 7th resistance R7 to form loop, the two ends of the 7th resistance R7 produce pressure drop, the base stage of the first NPN type triode Q1 is made to be high level, first NPN type triode Q1 conducting, the output of rectification module 10 is communicated with the output of DC voltage-stabilizing module 30.
The utility model also provides a kind of electronic equipment, and this electronic equipment comprises switching power circuit.This switching power circuit can comprise the technical scheme in above-mentioned any embodiment, its more detailed construction can refer to Fig. 1 and Fig. 2, do not repeat at this.Owing to have employed the scheme of aforementioned switches power circuit, the utility model electronic equipment is compared to existing electronic equipment, and its switching power circuit eliminates the use of transformer, and without the need to high voltage bearing device for power switching, cost significantly reduces.
These are only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (8)
1. a switching power circuit, is characterized in that, described switching power circuit comprises ac input end, rectification module, power switching modules, DC voltage-stabilizing module, filter capacitor and drive control module, wherein:
The input of described rectification module connects described ac input end, and the output of described rectification module connects the input of described DC voltage-stabilizing module through described power switching modules;
The input of described DC voltage-stabilizing module is through described filter capacitor ground connection, and the output of described DC voltage-stabilizing module is as the power output end of described switching power circuit;
The first input end of described drive control module receives the input of reference voltage, and the second input of described drive control module connects the output of described rectification module, and the output of described driver module connects described power switching modules; Described drive control module is used for the voltage of the voltage of its first input end and its second input to compare, and exports corresponding level signal to described power switching modules, to control described power switching modules break-make according to comparative result.
2. switching power circuit as claimed in claim 1, it is characterized in that, described switching power circuit also comprises division module, and the second input of described drive control module connects the output of described rectification module through described division module.
3. switching power circuit as claimed in claim 2, it is characterized in that, described division module comprises the first resistance and the second resistance, described first resistance is connected between the second input of described drive control module and the output of described rectification module, one end of described second resistance connects the second input of described drive control module, the other end ground connection of described second resistance.
4. switching power circuit as claimed in claim 1, it is characterized in that, described power switching modules is the first NPN type triode, the collector electrode of described first NPN type triode connects the output of described rectification module, the emitter of described first NPN type triode connects the input of described DC voltage-stabilizing module, and the base stage of described first NPN type triode connects the output of described drive control module.
5. switching power circuit as claimed in claim 1, it is characterized in that, described rectification module is full-wave rectifying circuit, the ac input end of described full-wave rectifying circuit is the input of described rectification module, the direct current output plus terminal of described full-wave rectifying circuit is the output of described rectification module, and the direct current of described full-wave rectifying circuit exports negativing ending grounding.
6. the switching power circuit according to any one of claim 1-5, it is characterized in that, described drive control module comprises comparator and drive circuit, two inputs of described comparator are respectively first input end and second input of described drived control block module, the output of described comparator connects the signal input part of described drive circuit, and the signal output part of described drive circuit is the output of described drive control module.
7. switching power circuit as claimed in claim 6, it is characterized in that, described drive circuit comprises the second NPN type triode, photoelectrical coupler, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance, wherein,
One end of described 3rd resistance is as the signal input part of described drive circuit, and the other end of described 3rd resistance connects the base stage of described second NPN type triode and one end of described 4th resistance, and the other end of described 4th resistance connects power supply;
The input positive pole of described photoelectrical coupler connects power supply, and the input negative pole of described photoelectrical coupler connects the collector electrode of described second NPN type triode, the grounded emitter of described second NPN type triode through described 5th resistance;
The output cathode of described photoelectrical coupler connects the output of described rectification module through described 6th resistance, the output negative pole of described photoelectrical coupler as described drive circuit signal output part and through described 7th grounding through resistance.
8. an electronic equipment, is characterized in that, described electronic equipment comprises the switching power circuit according to any one of claim 1-7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520356342.7U CN204721217U (en) | 2015-05-28 | 2015-05-28 | Switching power circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520356342.7U CN204721217U (en) | 2015-05-28 | 2015-05-28 | Switching power circuit and electronic equipment |
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| CN204721217U true CN204721217U (en) | 2015-10-21 |
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| CN201520356342.7U Active CN204721217U (en) | 2015-05-28 | 2015-05-28 | Switching power circuit and electronic equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106843353A (en) * | 2017-03-31 | 2017-06-13 | 北京东方计量测试研究所 | High-voltage dc stabilization pressuring power |
| CN109946598A (en) * | 2019-03-22 | 2019-06-28 | Tcl-罗格朗国际电工（惠州）有限公司 | Double control switch detection circuit and device |
| CN113659831A (en) * | 2021-08-06 | 2021-11-16 | 优利德科技(中国)股份有限公司 | Low-ripple linear control device and linear control method |
-
2015
- 2015-05-28 CN CN201520356342.7U patent/CN204721217U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106843353A (en) * | 2017-03-31 | 2017-06-13 | 北京东方计量测试研究所 | High-voltage dc stabilization pressuring power |
| CN109946598A (en) * | 2019-03-22 | 2019-06-28 | Tcl-罗格朗国际电工（惠州）有限公司 | Double control switch detection circuit and device |
| CN113659831A (en) * | 2021-08-06 | 2021-11-16 | 优利德科技(中国)股份有限公司 | Low-ripple linear control device and linear control method |
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