CN209844837U - Positive and negative voltage output circuit and resonant circuit - Google Patents
Positive and negative voltage output circuit and resonant circuit Download PDFInfo
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- CN209844837U CN209844837U CN201921100015.XU CN201921100015U CN209844837U CN 209844837 U CN209844837 U CN 209844837U CN 201921100015 U CN201921100015 U CN 201921100015U CN 209844837 U CN209844837 U CN 209844837U
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- 239000003990 capacitor Substances 0.000 claims abstract description 53
- 238000005070 sampling Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 1
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Abstract
The utility model discloses a positive negative voltage output circuit and resonant circuit, positive negative voltage output circuit includes: the power supply comprises a first power supply access end, a second power supply access end, a first voltage output unit and a second voltage output unit; the first voltage output unit comprises a first voltage limiter and a first capacitor, and the second voltage output unit comprises a second voltage limiter and a second capacitor; the positive electrode of the first voltage limiter is connected with the first power supply input end, and the negative electrode of the first voltage limiter is connected with the first end of the first capacitor; the second end of the first capacitor is connected with the second power supply access end; the first end of the second capacitor is connected with the second power supply access end, the second end of the second capacitor is connected with the anode of the second voltage limiter, and the cathode of the second voltage limiter is connected with the first power supply access end. The utility model discloses a positive negative voltage output circuit has simple structure, advantage such as circuit cost is low.
Description
Technical Field
The utility model relates to a circuit field specifically relates to a positive negative voltage output circuit and resonant circuit.
Background
With the improvement of electronic technology and the development of electronic products, positive and negative voltages are often required to simultaneously power some systems. For example, in a high-power frequency converter, a negative voltage is used to provide a turn-off negative voltage for an IGBT, and a positive voltage is used to provide a turn-on positive voltage; in addition, in the operational amplifier of the system, a bias voltage with positive and negative symmetry is used for supplying power.
One prior positive and negative voltage output circuit applicable to LLC circuits is shown in fig. 1, which includes 4 diodes and two capacitors and requires 3 transformer output pins to be connected. The problem that the conventional transformer has insufficient pin number if the circuit has a third output path, a new transformer framework needs to be opened, the number of diodes of the whole circuit is large, and the cost of the whole circuit is improved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a positive negative voltage output circuit and resonant circuit, overall circuit simple structure, the circuit is with low costs.
The embodiment of the utility model provides a positive negative voltage output circuit, include: the power supply comprises a first power supply access end, a second power supply access end, a first voltage output unit and a second voltage output unit; the first voltage output unit comprises a first voltage limiter and a first capacitor, and the second voltage output unit comprises a second voltage limiter and a second capacitor;
the positive electrode of the first voltage limiter is connected with the first power supply input end, and the negative electrode of the first voltage limiter is connected with the first end of the first capacitor; the second end of the first capacitor is connected with the second power supply access end;
the first end of the second capacitor is connected with the second power supply access end, the second end of the second capacitor is connected with the anode of the second voltage limiter, and the cathode of the second voltage limiter is connected with the first power supply access end.
Preferably, the first voltage limiter and the second voltage limiter are zener diodes.
Preferably, the first capacitor and the second capacitor are electrolytic capacitors, the first end of the first capacitor and the first end of the second capacitor are anodes, and the second end of the first capacitor and the second end of the second capacitor are cathodes.
Preferably, the power supply further comprises a first voltage output end and a second voltage output end; wherein the first voltage output terminal is connected with a negative electrode of the first voltage limiter; the second voltage output end is connected with the second end of the second capacitor.
Preferably, the second power supply access terminal is grounded.
The utility model also provides a resonance circuit, which comprises a main power topology circuit and the positive and negative voltage output circuit; the main power topology circuit outputs low-voltage direct current to the positive and negative voltage output circuit through a transformer; and the first power supply access end and the second power supply access end of the positive and negative voltage output circuit are respectively connected to different output pins of the transformer.
Preferably, the power supply circuit is electrically connected with the main power topology circuit to supply power to a control chip of the main power topology circuit.
Preferably, the power supply further comprises a main circuit voltage output circuit and a voltage sampling feedback circuit, wherein the main circuit voltage output circuit is connected with the main power topology circuit and the voltage sampling feedback circuit; the main circuit voltage output circuit supplies power to the load by receiving the voltage of the main power topological circuit, and the voltage sampling feedback circuit samples the output voltage of the main circuit voltage output circuit and feeds the output voltage back to the control chip of the main power topological circuit.
Compared with the prior art, the positive and negative voltage output circuit provided by the embodiment only needs to occupy two output pins of the transformer on the premise of realizing normal positive and negative voltage output, and the number of the diodes is reduced to 2, so that the requirements on the transformer framework pins and the cost reduction effect can be simultaneously realized.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the embodiments will be briefly described below, and obviously, the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a conventional positive and negative voltage output circuit.
Fig. 2 is a schematic circuit diagram of a positive-negative voltage output circuit according to a first embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a resonant circuit according to a first embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 2, a first embodiment of the present invention provides a positive and negative voltage output circuit, which includes: the power supply comprises a first power supply access end V1, a second power supply access end V2, a first voltage output unit and a second voltage output unit; the first voltage output unit comprises a first voltage limiter D1 and a first capacitor E1, and the second voltage output unit comprises a second voltage limiter D2 and a second capacitor E2.
Wherein the positive pole of the first voltage limiter D1 is connected to the first power input V1, and the negative pole of the first voltage limiter D1 is connected to the first end of the first capacitor E1; the second end of the first capacitor D1 is connected to the second power input terminal V2.
A first end of the second capacitor E2 is connected to the second power supply input terminal V2, a second end of the second capacitor E2 is connected to a positive electrode of the second voltage limiter D2, and a negative electrode of the second voltage limiter D2 is connected to the first power supply input terminal V1.
In this embodiment, the positive and negative voltage output circuit further includes a first voltage output terminal V3 and a second voltage output terminal V4; wherein the first voltage output terminal V3 is connected to the negative terminal of the first voltage limiter D1; the second voltage output terminal V4 is connected to the second terminal of the second capacitor E2.
The first voltage output end V3 and the second voltage output end V4 are used for connecting a load so as to supply power to the load.
In this embodiment, the first voltage input terminal V1 and the second voltage input terminal V2 are used for connecting an external power source, for example, can be connected to different output pins of a transformer. For convenience of description, the first voltage input terminal V1 is connected to the first output pin of the transformer, the second voltage input terminal V2 is connected to the second output pin of the transformer, the first output pin of the transformer is used for outputting current in the first half period of the power supply, and the second output pin of the transformer is used for outputting current in the second half period of the power supply.
In this embodiment, when the external power source outputs dc power to the positive and negative voltage output circuits through the transformer, in the first half cycle of the power supply, the current flows from the first output pin, sequentially flows through the first voltage limiter D1 and the first capacitor E1, then flows back to the second voltage input terminal V2, and outputs positive voltage through the first voltage output terminal V3 to power the load. In the first half period of the power supply, the current flows out from the second output pin, flows through the second voltage limiter D2 and the second capacitor E2 in sequence, flows back to the first voltage input end V1, and outputs a negative voltage through the second voltage output end V4 to supply power to the load, so that positive and negative voltage output is realized.
In summary, compared with the prior art, the positive and negative voltage output circuit provided by this embodiment only needs to occupy two output pins of the transformer on the premise of realizing normal positive and negative voltage output, and the number of diodes is reduced to 2, which can simultaneously play a role in reducing the requirements on the transformer skeleton pins and reducing the cost.
Preferably, the first voltage limiter D1 and the second voltage limiter D2 are zener diodes.
The zener diode is a surface contact type crystal diode made of a silicon material, which is a semiconductor device having a high resistance up to a critical reverse breakdown voltage. When the voltage stabilizing diode is in reverse breakdown, the terminal voltage is almost unchanged in a certain current range, and the voltage stabilizing diode shows a very good voltage stabilizing characteristic.
Preferably, the first capacitor E1 and the second capacitor E2 are electrolytic capacitors, the first terminal of the first capacitor E1 and the first terminal of the second capacitor E2 are positive electrodes, and the second terminal of the first capacitor E1 and the second terminal of the second capacitor E2 are negative electrodes.
Compared with the common capacitor, the electrolytic capacitor has very large capacitance per unit volume, very large rated capacity, tens of thousands of muf or even a few f, and relatively low cost.
Preferably, the second power supply access terminal is grounded.
Referring to fig. 3, a second embodiment of the present invention further provides a resonant circuit, which includes a main power topology circuit 100 and the positive and negative voltage output circuits 200 as described above; wherein, the main power topology circuit 100 outputs low-voltage direct current to the positive and negative voltage output circuit 200 through a transformer; the first power supply input end and the second power supply input end of the positive and negative voltage output circuit 100 are respectively connected to one pin of the transformer.
In this embodiment, the resonant circuit further includes a power supply circuit 300, and the power supply circuit is electrically connected to the main power topology circuit 100 to supply power to the control chip of the main power topology circuit 100.
In this embodiment, the resonant circuit further includes a main circuit voltage output circuit 400 and a voltage sampling feedback circuit 500, wherein the main circuit voltage output circuit 400 is connected to the main power topology circuit 100 and the voltage sampling feedback circuit 500; the main circuit voltage output circuit 400 supplies power to the load by receiving the voltage of the main power topology circuit 100, and the voltage sampling feedback circuit 500 samples the output voltage of the main circuit voltage output circuit 400 and feeds the sampled output voltage back to the control chip of the main power topology circuit 100.
Specifically, in operation, after the power supply is powered on, the VCC pin is charged through the HV pin inside the control chip of the main power topology circuit 100, and after the start voltage is charged, the HO pin and the LO pin output the driving signals, so that Q1 and Q3 are alternately turned on, the transformer T101 starts to operate, the power supply circuit 300, the positive and negative voltage output circuits 200, and the main circuit voltage output circuit 400 start to output voltage, and the output voltage depends on the ratio of the winding turns of the transformer T101. The voltage sampling feedback circuit 500 samples the output voltage Vo of the main circuit voltage output circuit 400, and transmits a signal to the FB pin of the main power topology circuit 100 through an optical coupler, so that the control chip adjusts the switching frequency, and the output voltage is stable. The voltages output by supply circuit 300 and positive and negative voltage output circuit 200 depend on the ratio of the number of turns of the transformer winding in the transformer section to the number of turns of the transformer winding in the main voltage output circuit 400 section of the two circuits. After the circuit works, the VCC power supply of the control chip is provided by the power supply circuit 300, and the HV pin stops supplying power to the VCC, so that the power consumption of the control chip is reduced, and the heating is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A positive-negative voltage output circuit, comprising: the power supply comprises a first power supply access end, a second power supply access end, a first voltage output unit and a second voltage output unit; the first voltage output unit comprises a first voltage limiter and a first capacitor, and the second voltage output unit comprises a second voltage limiter and a second capacitor;
the positive electrode of the first voltage limiter is connected with the first power supply input end, and the negative electrode of the first voltage limiter is connected with the first end of the first capacitor; the second end of the first capacitor is connected with the second power supply access end;
the first end of the second capacitor is connected with the second power supply access end, the second end of the second capacitor is connected with the anode of the second voltage limiter, and the cathode of the second voltage limiter is connected with the first power supply access end.
2. The positive-negative voltage output circuit of claim 1, wherein the first voltage limiter and the second voltage limiter are zener diodes.
3. The positive-negative voltage output circuit according to claim 1, wherein the first capacitor and the second capacitor are electrolytic capacitors, the first terminal of the first capacitor and the first terminal of the second capacitor are positive electrodes, and the second terminal of the first capacitor and the second terminal of the second capacitor are negative electrodes.
4. The positive-negative voltage output circuit of claim 1, further comprising a first voltage output terminal and a second voltage output terminal; wherein the first voltage output terminal is connected with a negative electrode of the first voltage limiter; the second voltage output end is connected with the second end of the second capacitor.
5. The positive and negative voltage output circuit of claim 1, wherein said second power supply access is connected to ground.
6. A resonant circuit comprising a main power topology circuit and a positive and negative voltage output circuit as claimed in any one of claims 1 to 5; the main power topology circuit outputs direct current to the positive and negative voltage output circuits through a transformer; and the first power supply access end and the second power supply access end of the positive and negative voltage output circuit are respectively connected to different output pins of the transformer.
7. The resonant circuit of claim 6, further comprising a power supply circuit electrically connected to the main power topology circuit to power a control chip of the main power topology circuit.
8. The resonant circuit of claim 7, further comprising a main circuit voltage output circuit and a voltage sampling feedback circuit, the main circuit voltage output circuit being connected with the main power topology circuit and the voltage sampling feedback circuit; the main circuit voltage output circuit supplies power to the load by receiving the voltage of the main power topological circuit, and the voltage sampling feedback circuit samples the output voltage of the main circuit voltage output circuit and feeds the output voltage back to the control chip of the main power topological circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921100015.XU CN209844837U (en) | 2019-07-12 | 2019-07-12 | Positive and negative voltage output circuit and resonant circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921100015.XU CN209844837U (en) | 2019-07-12 | 2019-07-12 | Positive and negative voltage output circuit and resonant circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209844837U true CN209844837U (en) | 2019-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921100015.XU Active CN209844837U (en) | 2019-07-12 | 2019-07-12 | Positive and negative voltage output circuit and resonant circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209844837U (en) |
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2019
- 2019-07-12 CN CN201921100015.XU patent/CN209844837U/en active Active
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