CN204168146U - A kind of DC-DC push-pull circuit - Google Patents
A kind of DC-DC push-pull circuit Download PDFInfo
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- CN204168146U CN204168146U CN201420570072.5U CN201420570072U CN204168146U CN 204168146 U CN204168146 U CN 204168146U CN 201420570072 U CN201420570072 U CN 201420570072U CN 204168146 U CN204168146 U CN 204168146U
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Abstract
The utility model discloses a kind of DC-DC push-pull circuit, comprise direct-flow input end, DC output end, pwm signal control circuit and circuit for power conversion, circuit for power conversion comprises inverter circuit, high frequency transformer and current rectifying and wave filtering circuit, the armature winding of high frequency transformer comprises two coils, and inverter circuit comprises two switching tubes; The positive pole of the first termination direct-flow input end of the first switching tube, the first end of the second termination second coil, the negative pole of the second termination direct-flow input end of the second coil; The positive pole of the first termination direct-flow input end of the first coil, the first end of the second termination second switch pipe, the negative pole of the second termination direct-flow input end of two switching tubes; Pwm signal control circuit comprises two complementary PWM ripple drive singal outputs, and two complementary PWM ripple drive singal outputs connect the control end of the first switching tube and second switch pipe respectively.DC-DC push-pull circuit of the present utility model is simple, stable performance, be convenient to safeguard.
Description
[technical field]
The utility model relates to DC-DC DC converter, particularly relates to a kind of DC-DC push-pull circuit.
[background technology]
Switching Power Supply is described as energy-efficient power supply, and it represents the developing direction of stabilized voltage power supply, has now become the main product of stabilized voltage power supply.When switching tube due to Switching Power Supply is operated in HF switch state, its equivalent resistance is very little, and when flowing through large electric current, the energy consumed on Correctional tube is very little, therefore power-efficient can reach 70%-90%, improves nearly 1 times than normal linear stabilized voltage power supply efficiency.Utilize that the Switching Power Supply volume of High Frequency Link technology is little, lightweight, reliability is high simultaneously, this technology be realize high power density, reasonable plan that high conversion efficiency, excellent comprehensive performance DC-DC convert.
The structure of the DC-DC converter with high frequency transformer as shown in Figure 2.
At present, there are the DC/DC converter technique of transformer isolation comparatively commonly push-pull converter and forward converter in traditional topological structure, the topological structure of tradition forward converter and push-pull converter two kinds of circuit as shown in Figure 3 and Figure 4, two kinds of circuit have respective pluses and minuses, but there is certain limitation: single-ended forward converter is in order to prevent magnetic core of transformer saturated, there is the problem that degaussing resets, therefore have certain restrictive condition to duty ratio; The voltage stress that push-pull converter power switch pipe bears is high, be only applicable to low-voltage input occasion, and leakage inductance energy causes high due to voltage spikes on switching tube during switching tube shutoff, propose very high requirement to the coiling of main power transformer, the magnetic bias problem of transformer proposes higher requirement to the consistency of the consistency of device and drive circuit pulse duration simultaneously.
[summary of the invention]
The technical problems to be solved in the utility model is to provide a kind of stable performance, the simple DC-DC push-pull circuit of structure.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of DC-DC push-pull circuit, comprise direct-flow input end, DC output end, pwm signal control circuit and circuit for power conversion, circuit for power conversion comprises inverter circuit, high frequency transformer and current rectifying and wave filtering circuit, the armature winding of high frequency transformer comprises two coils, and inverter circuit comprises two switching tubes; The positive pole of the first termination direct-flow input end of the first switching tube, the first end of the second termination second coil, the negative pole of the second termination direct-flow input end of the second coil; The positive pole of the first termination direct-flow input end of the first coil, the first end of the second termination second switch pipe, the negative pole of the second termination direct-flow input end of two switching tubes; Pwm signal control circuit comprises two complementary PWM ripple drive singal outputs, and two complementary PWM ripple drive singal outputs connect the control end of the first switching tube and second switch pipe respectively.
Above-described DC-DC push-pull circuit, comprises clamp capacitor, and clamp capacitor is connected between the second end of the first switching tube and the first end of second switch pipe.
Above-described DC-DC push-pull circuit, the first end of the positive pole termination second switch pipe of clamp capacitor, the second end of negative pole termination first switching tube.
Above-described DC-DC push-pull circuit, the first end of the second coil and the second end of the first coil are Same Name of Ends.
Above-described DC-DC push-pull circuit, pwm signal control circuit comprises comparator, PWM module, isolated drive circuit and voltage sampling circuit, the DC output end described in input termination of voltage sampling circuit, export the first input end of termination comparator, the second input termination reference voltage of comparator; The output of the input termination comparator of PWM module, the complementary pwm signal output of PWM module two connects two inputs of isolated drive circuit respectively, and the complementary PWM ripple drive singal output of isolated drive circuit two connects the control end of the first switching tube and second switch pipe respectively.
Above-described DC-DC push-pull circuit, isolated drive circuit is transformer isolation drive circuit.
Above-described DC-DC push-pull circuit, circuit for power conversion is forward conversion circuit.
DC-DC push-pull circuit of the present utility model is simple, stable performance, be convenient to safeguard.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the theory diagram of the utility model embodiment DC-DC push-pull circuit.
Fig. 2 is the structured flowchart of the DC-DC converter of prior art band high frequency transformer.
Fig. 3 is the schematic diagram of prior art push-pull converter.
Fig. 4 is the schematic diagram of prior art forward converter.
[embodiment]
The utility model embodiment DC-DC push-pull circuit as shown in Figure 1, comprises direct-flow input end DC INPUT, DC output end BUS.V, pwm signal control circuit and circuit for power conversion.Circuit for power conversion is forward conversion circuit, comprises inverter circuit, high frequency transformer and current rectifying and wave filtering circuit.
Both positive and negative polarity DC+ and DC-of the direct-flow input end of the input termination DC-DC circuit of inverter circuit, the former limit winding of the output termination high frequency transformer of inverter circuit, the vice-side winding of high frequency transformer connects current rectifying and wave filtering circuit and forms isolated DC-DC push-pull circuit.
Pwm signal control circuit comprises comparator, PWM module, isolated drive circuit and voltage sampling circuit.
The output of the input termination current rectifying and wave filtering circuit of voltage sampling circuit, i.e. the DC output end BUS.V of DC-DC push-pull circuit.The first input end of comparator connects the output of voltage sampling circuit, the second input termination reference data voltage; The input of the output termination PWM module of comparator, the triangular signal also having an input termination self-oscillation of PWM module, the output of PWM module connects the control end of circuit for power conversion switching tube through transformer isolation drive circuit.
Inverter circuit comprises 2 switching tube Q1 and Q2, and PWM module comprises the PWM ripple drive singal output of two signal complementations, and PWM exports the input of termination isolated drive circuit, the control end of the corresponding switching tube of output termination of isolated drive circuit.
The 2.5V a reference source that reference data voltage adopts TL431 to form, its reference voltage good stability.
Circuit for power conversion is that two metal-oxide-semiconductors Q1, Q2 and transformer composition recommend inversion unit circuit.The 2.5V a reference source that reference data voltage adopts TL431 to form, this signal is delivered to PWM module and is produced two complementary PWM drive singal, when PWM1 is low level time, PWM2 is high level, and two-way pwm signal is with certain Dead Time, avoids power supply to lead directly to.
As shown in Figure 2, the armature winding T1 of high frequency transformer comprises two coil N1 and N2, and 2 pin of coil N1 and 3 pin of coil N2 are Same Name of Ends.
The drain electrode of metal-oxide-semiconductor Q1 meets the positive pole D+ of direct-flow input end, the first end (3 pin) of source connection circle N2, and second end (4 pin) of coil N2 meets the negative pole D-of direct-flow input end.The first end (1 pin) of coil N1 meets the positive pole D+ of direct-flow input end, and the second end (2 pin) connects the drain electrode of metal-oxide-semiconductor Q2, and the source electrode of metal-oxide-semiconductor Q2 meets the negative pole D-of direct-flow input end; Pwm signal control circuit comprises two complementary PWM ripple drive singal outputs, and two complementary PWM ripple drive singal outputs connect the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 respectively.
PWM drive singal PWM1, PWM2 deliver to the input of driving transformer T2.When PWM1 is high level, (now PWM2 is low level) metal-oxide-semiconductor Q1 works, DC+ by 3 pin of metal-oxide-semiconductor Q1 to transformer T1 through 4 pin again to DC-, 5 pin of the secondary winding N3 of transformer T1 are just, 6 pin are negative; When PWM2 is high level, (now PWM1 is low level) DC+ is just by 6 pin of the secondary winding N3 of metal-oxide-semiconductor Q2 to DC-, transformer T1 by 1 pin of transformer T1 to 2 pin again, and 5 pin are negative.Due to PWM1 and PWM2 continuous operation, the N3 winding of transformer T1 produces the direct current of alternation, the alternating current be namely generally called between 5 pin and 6 pin, more just obtains VD by current rectifying and wave filtering circuit.Deliver to comparator U1 by the REF reference voltage signal of the BUS.V direct current signal and standard that export sample circuit output, the result that U1 compares gives PWM module, adjusts the duty ratio of PWM1 and PWM2, and then the output waveform of adjustment inverter circuit.
The drain electrode of the positive pole termination metal-oxide-semiconductor Q2 of clamp capacitor, negative pole termination closes the source electrode of pipe Q1.
Clamp capacitor C can eliminate the voltage overshoot phenomenon of switching tube.Simultaneously, because the terminal voltage of clamp capacitor C has floating property, transformer flux has equal Flux consumption and the symmetry magneting of magnetic core in two half periods of same period to select suitable clamp capacitor value to ensure, exciting curent and magnetic flux is made to get back to starting point when end cycle, the phenomenon of non DC bias.
The above embodiment of the utility model will recommend translation circuit and forward conversion circuit organically combines, remain the advantage of two kinds of circuit, overcome their respective shortcomings, can effectively suppress the due to voltage spikes of switching tube to also inhibits the intrinsic DC magnetic bias phenomena of push-pull converter simultaneously, stable performance, be convenient to safeguard.
As shown in Figure 1, two switching tubes Q1, Q2 of modified model push-pull circuit are not all in ON time, and input DC power charges to clamp capacitor C and forms loop current, and while a switch conduction, form loop between clamp capacitor C and Transformer Winding, clamp capacitor discharges.No matter be which conducting of Q1 or Q2, clamp capacitor C is a winding parallel with transformer, thus voltage on clamp capacitor C always upper negative under just, and approximate input DC power voltage U
in.And U
in, U
c, U
ds1and U
ds2form a loop, can be known by Kirchhoff's second law: U
in+ U
c=U
ds1+ U
ds2=2U
in, in formula, Uds1 and Uds1 is respectively the drain-source pressure drop of switching tube Q1, Q2.When the voltage born when the drain-source pole of switching tube Q1 or Q2 is reverse-biased, the now diode current flow of reverse parallel connection with it, drain-source voltage clamper is at 0V.Due to switching tube switching tube Q1, Q2 alternate conduction, therefore born the in the course of the work maximum voltage stress of switching tube Q1 or Q2 is 2Uin, therefore adds the due to voltage spikes that clamp capacitor C effectively can suppress switching tube.
Because the terminal voltage of clamp capacitor C has floating property, transformer flux has equal Flux consumption and the symmetry magneting of magnetic core in two half periods of same period to select suitable clamp capacitor value to ensure, exciting curent and magnetic flux is made to get back to starting point when end cycle, therefore non DC bias phenomenon.
Claims (7)
1. a DC-DC push-pull circuit, comprise direct-flow input end, DC output end, pwm signal control circuit and circuit for power conversion, circuit for power conversion comprises inverter circuit, high frequency transformer and current rectifying and wave filtering circuit, it is characterized in that, the armature winding of high frequency transformer comprises two coils, and inverter circuit comprises two switching tubes; The positive pole of the first termination direct-flow input end of the first switching tube, the first end of the second termination second coil, the negative pole of the second termination direct-flow input end of the second coil; The positive pole of the first termination direct-flow input end of the first coil, the first end of the second termination second switch pipe, the negative pole of the second termination direct-flow input end of two switching tubes; Pwm signal control circuit comprises two complementary PWM ripple drive singal outputs, and two complementary PWM ripple drive singal outputs connect the control end of the first switching tube and second switch pipe respectively.
2. DC-DC push-pull circuit according to claim 1, is characterized in that, comprise clamp capacitor, and clamp capacitor is connected between the second end of the first switching tube and the first end of second switch pipe.
3. DC-DC push-pull circuit according to claim 2, is characterized in that, the first end of the positive pole termination second switch pipe of clamp capacitor, the second end of negative pole termination first switching tube.
4. DC-DC push-pull circuit according to claim 1, is characterized in that, the first end of the second coil and the second end of the first coil are Same Name of Ends.
5. DC-DC push-pull circuit according to claim 4, it is characterized in that, pwm signal control circuit comprises comparator, PWM module, isolated drive circuit and voltage sampling circuit, the DC output end described in input termination of voltage sampling circuit, export the first input end of termination comparator, the second input termination reference voltage of comparator; The output of the input termination comparator of PWM module, the complementary pwm signal output of PWM module two connects two inputs of isolated drive circuit respectively, and the complementary PWM ripple drive singal output of isolated drive circuit two connects the control end of the first switching tube and second switch pipe respectively.
6. DC-DC push-pull circuit according to claim 5, is characterized in that, isolated drive circuit is transformer isolation drive circuit.
7. DC-DC push-pull circuit according to claim 5, is characterized in that, circuit for power conversion is forward conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420570072.5U CN204168146U (en) | 2014-09-29 | 2014-09-29 | A kind of DC-DC push-pull circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420570072.5U CN204168146U (en) | 2014-09-29 | 2014-09-29 | A kind of DC-DC push-pull circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204168146U true CN204168146U (en) | 2015-02-18 |
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|---|---|---|---|
| CN201420570072.5U Expired - Fee Related CN204168146U (en) | 2014-09-29 | 2014-09-29 | A kind of DC-DC push-pull circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375781A (en) * | 2015-12-21 | 2016-03-02 | 常州市肯迪电器制造有限公司 | Circuit system of handheld portable low-voltage DC endotherm knife |
| CN105591558A (en) * | 2016-03-09 | 2016-05-18 | 浙江大学城市学院 | Single-pole high-power-factor push-pull double-forward circuit and design method thereof |
| CN108874718A (en) * | 2018-09-07 | 2018-11-23 | 瑞纳智能设备股份有限公司 | A kind of low-power consumption isolation type bus takes electric MBUS communication interface circuit |
| CN112737340A (en) * | 2020-12-22 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Isolating switch power supply circuit applied to acquisition terminal |
| CN113098299A (en) * | 2021-05-20 | 2021-07-09 | 美钻石油钻采***(上海)有限公司 | Rectifying device for oil-gas signal processing and control system of ocean platform |
-
2014
- 2014-09-29 CN CN201420570072.5U patent/CN204168146U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375781A (en) * | 2015-12-21 | 2016-03-02 | 常州市肯迪电器制造有限公司 | Circuit system of handheld portable low-voltage DC endotherm knife |
| CN105591558A (en) * | 2016-03-09 | 2016-05-18 | 浙江大学城市学院 | Single-pole high-power-factor push-pull double-forward circuit and design method thereof |
| CN105591558B (en) * | 2016-03-09 | 2018-05-25 | 浙江大学城市学院 | A kind of monopole High Power Factor recommends double forward converters and design method |
| CN108874718A (en) * | 2018-09-07 | 2018-11-23 | 瑞纳智能设备股份有限公司 | A kind of low-power consumption isolation type bus takes electric MBUS communication interface circuit |
| CN112737340A (en) * | 2020-12-22 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Isolating switch power supply circuit applied to acquisition terminal |
| CN113098299A (en) * | 2021-05-20 | 2021-07-09 | 美钻石油钻采***(上海)有限公司 | Rectifying device for oil-gas signal processing and control system of ocean platform |
| CN113098299B (en) * | 2021-05-20 | 2023-06-06 | 美钻石油钻采***(上海)有限公司 | Rectifying device for ocean platform oil gas signal processing and control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150218 Termination date: 20190929 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |