CN209881657U - Voltage-sharing circuit for power converter - Google Patents
Voltage-sharing circuit for power converter Download PDFInfo
- Publication number
- CN209881657U CN209881657U CN201920544328.8U CN201920544328U CN209881657U CN 209881657 U CN209881657 U CN 209881657U CN 201920544328 U CN201920544328 U CN 201920544328U CN 209881657 U CN209881657 U CN 209881657U
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- Prior art keywords
- voltage
- input end
- primary coil
- power switch
- power converter
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- Withdrawn - After Issue
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- 239000003990 capacitor Substances 0.000 claims description 46
- 230000005669 field effect Effects 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 claims 1
- 238000002955 isolation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
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- Dc-Dc Converters (AREA)
Abstract
The utility model relates to a voltage-sharing circuit for power converter, including first input electric capacity C1, first input electric capacity C2, first primary coil L1, second primary coil L2, first diode D1, second diode D2, power switch pipe Q1 and magnetic core T1, when power switch pipe Q1 switches on, voltage-sharing circuit through power converter finally makes first input electric capacity C1 both ends voltage equal second input electric capacity C2 both ends voltage, power converter's voltage-sharing circuit only uses a power switch pipe Q1, power switch pipe Q1's drive circuit can adopt simple non-isolation drive circuit simultaneously, need not adopt complicated isolation drive circuit.
Description
Technical Field
The utility model relates to a power converter field, concretely relates to voltage-sharing circuit for power converter.
Background
When the input voltage of the primary side of the power converter is higher, the input end capacitor of the power converter is usually connected in series by adopting two capacitors with the same capacitance value, the voltage on the two input end capacitors is unequal due to the discreteness of the parameters of the input end capacitor device or other reasons, namely, the voltage is not equalized, and when the voltage is not equalized seriously, the voltage of the input end capacitor can exceed the rated withstand voltage of the capacitor, so that the input end capacitor is damaged.
The utility model discloses an application number is 01125171.9 utility model "a equalizer circuit for power converter" discloses a technical scheme, as shown in FIG. 1, an equalizer circuit for power converter adopts in-phase control's magnetic core flyback converter altogether to supply input mains voltage with the converter, two primary side coil turns are the same among the equalizer circuit, and power switch pipe Q5 and power switch pipe Q6 link to each other with the homophase pulse. If voltage difference exists between the units of the converter, when the power switch tube Q5 and the power switch tube Q6 are conducted, a voltage equalizing circuit generates loop current to realize voltage equalizing, the output characteristic of the circuit is improved, the voltage of the input end capacitor C1 and the voltage of the input end capacitor C2 are prevented from exceeding the withstand voltage of the capacitors, and all devices are prevented from being damaged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a new equalizer circuit for power converter for solve the comparatively complicated problem of isolation drive circuit of two power switch tubes among the equalizer circuit of current power converter.
The utility model adopts the technical scheme as follows:
a voltage-sharing circuit for a power converter comprises a first input end capacitor, a second input end capacitor, a first primary coil, a second primary coil, a first diode, a second diode, a power switch tube and a magnetic core;
the positive end of the input end of the power converter is connected to the positive electrode of the first input end capacitor and the non-homonymous end of the first primary coil, and the negative end of the input end of the power converter is connected to the negative electrode of the second input end capacitor and the homonymous end of the second primary coil;
the dotted terminal of the first primary coil is connected to the current input terminal of the power switch tube and the negative electrode of the first diode;
the non-dotted terminal of the second primary coil is connected to the current output terminal of the power switching tube and the anode of the second diode;
the cathode of the first input end capacitor is connected to the anode of the second input end capacitor, the anode of the first diode and the cathode of the second diode;
the first primary coil and the second primary coil are wound on the magnetic core;
the number of turns of the first primary coil is equal to the number of turns of the second primary coil;
the capacitance value of the first input end capacitor is equal to the capacitance value of the second input end capacitor.
Preferably, the power switch tube is a MOSFET field effect transistor, the current input end of the power switch tube is a drain electrode of the MOSFET field effect transistor, and the current output end of the power switch tube is a source electrode of the MOSFET field effect transistor.
The utility model discloses a theory of operation: when the power switch tube Q1 is turned on, a loop current is generated by the voltage equalizing circuit, so that the voltage equalizing between the two ends of the first input end capacitor C1 and the voltage equalizing between the two ends of the second input end capacitor C2 are equal.
The utility model has the advantages that: the utility model discloses a voltage-sharing circuit for power converter only uses a power switch tube can realize the voltage-sharing of first input electric capacity both ends voltage and second input electric capacity both ends voltage, and power switch tube's drive circuit is simple, need not adopt complicated isolation drive circuit, compares with application number 01125171.9 utility model "a voltage-sharing circuit for power converter", the utility model discloses a power converter's voltage-sharing circuit has used a power switch tube less, has reached the purpose of voltage-sharing of first input electric capacity both ends voltage and second input electric capacity both ends voltage equally, the technical scheme of the utility model have the characteristics of the circuit is simple.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic block circuit diagram of the utility model patent application No. 01125171.9.
Fig. 2 is a schematic block circuit diagram of embodiment 1.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
As shown in fig. 2, a voltage-sharing circuit for a power converter includes a first input end capacitor C1, a second input end capacitor C2, a first primary winding L1, a second primary winding L2, a first diode D1, a second diode D2, a power switch Q1, and a magnetic core T1;
the positive end Vin + of the input end of the power converter is connected to the positive electrode of the first input end capacitor C1 and the non-homonymous end of the first primary coil L1, and the negative end Vin-of the input end of the power converter is connected to the negative electrode of the second input end capacitor C2 and the homonymous end of the second primary coil L2;
the dotted terminal of the first primary coil L1 is connected to the current input terminal of the power switch Q1 and the negative electrode of the first diode D1;
the non-dotted terminal of the second primary coil L2 is connected to the current output terminal of the power switch Q1 and the anode of the second diode D2;
the cathode of the first input end capacitor C1 is connected to the anode of the second input end capacitor C2, the anode of the first diode D1 and the cathode of the second diode D2;
a first primary coil L1 and a second primary coil L2 are wound on a magnetic core T1;
the number of turns of the first primary coil L1 is equal to the number of turns of the second primary coil L2;
the capacitance of the first input terminal capacitor C1 is equal to the capacitance of the second input terminal capacitor C2.
The working principle is as follows: in the initial state, the power switch tube Q1 is in the off state, and voltage is loaded on the positive terminal Vin + of the input end of the power converter and the negative terminal Vin-of the input end of the power converter, the voltage across the first input end capacitor C1 is charged to Vc1, and the voltage across the second input end capacitor C2 is charged to Vc 2; when the power switch tube Q1 is turned on, if Vc1> Vc2, the voltage Vc1 at both ends of the first input end capacitor C1 is loaded to both ends of the first primary coil L1 through the power switch tube Q1 and the second diode D2, and since the number of turns of the first primary coil L1 is equal to that of the second primary coil L2, the induced voltage at both ends of the second primary coil L2 is Vc1, and the second input end capacitor C2 is charged through the second diode D2, and finally the voltage at both ends of the first input end capacitor C1 is equal to the voltage at both ends of the second input end capacitor C2; if Vc2> Vc1, the voltage Vc2 across the second input terminal capacitor C2 is loaded to both ends of the second primary coil L2 through the power switch Q1 and the first diode D1, and since the number of turns of the first primary coil L1 is equal to the number of turns of the second primary coil L2, the induced voltage across the first primary coil L1 is Vc2, and the first input terminal capacitor C1 is charged through the first diode D1, so that the voltage across the first input terminal capacitor C1 is finally equal to the voltage across the second input terminal capacitor C2.
The power switch Q1 may be a MOSFET field effect transistor, the current input terminal of the power switch Q1 is a drain of the MOSFET field effect transistor, and the current output terminal of the power switch Q1 is a source of the MOSFET field effect transistor.
The utility model discloses a voltage-sharing circuit for power converter only uses a power switch pipe Q1 can realize first input electric capacity C1 both ends voltage with the voltage-sharing of second input electric capacity C2 both ends voltage, and power switch pipe Q1's drive circuit is simple, need not adopt complicated isolation drive circuit, compares with application number 01125171.9's utility model patent "a voltage-sharing circuit for power converter", the utility model discloses a power converter's voltage-sharing circuit has used less a power switch pipe, but has reached the purpose of realizing the voltage-sharing of first input electric capacity C1 both ends voltage with second input electric capacity C2 both ends voltage equally, simultaneously the utility model discloses a power switch pipe Q1's drive circuit has the characteristics that the circuit is simple.
Claims (2)
1. A voltage equalizing circuit for a power converter, characterized by: the voltage-sharing circuit for the power converter comprises a first input end capacitor, a second input end capacitor, a first primary coil, a second primary coil, a first diode, a second diode, a power switch tube and a magnetic core;
the positive end of the input end of the power converter is connected to the positive electrode of the first input end capacitor and the non-homonymous end of the first primary coil, and the negative end of the input end of the power converter is connected to the negative electrode of the second input end capacitor and the homonymous end of the second primary coil;
the dotted terminal of the first primary coil is connected to the current input terminal of the power switch tube and the negative electrode of the first diode;
the non-dotted terminal of the second primary coil is connected to the current output terminal of the power switching tube and the anode of the second diode;
the cathode of the first input end capacitor is connected to the anode of the second input end capacitor, the anode of the first diode and the cathode of the second diode;
the first primary coil and the second primary coil are wound on the magnetic core;
the number of turns of the first primary coil is equal to the number of turns of the second primary coil;
the capacitance value of the first input end capacitor is equal to the capacitance value of the second input end capacitor.
2. The voltage-sharing circuit for a power converter according to claim 1, wherein: the power switch tube is an MOSFET (metal oxide semiconductor field effect transistor), the current input end of the power switch tube is the drain electrode of the MOSFET, and the current output end of the power switch tube is the source electrode of the MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920544328.8U CN209881657U (en) | 2019-04-22 | 2019-04-22 | Voltage-sharing circuit for power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920544328.8U CN209881657U (en) | 2019-04-22 | 2019-04-22 | Voltage-sharing circuit for power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209881657U true CN209881657U (en) | 2019-12-31 |
Family
ID=68961181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920544328.8U Withdrawn - After Issue CN209881657U (en) | 2019-04-22 | 2019-04-22 | Voltage-sharing circuit for power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209881657U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962624A (en) * | 2019-04-22 | 2019-07-02 | 浙江万胜智能科技股份有限公司 | A kind of equalizer circuit for supply convertor |
-
2019
- 2019-04-22 CN CN201920544328.8U patent/CN209881657U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962624A (en) * | 2019-04-22 | 2019-07-02 | 浙江万胜智能科技股份有限公司 | A kind of equalizer circuit for supply convertor |
| CN109962624B (en) * | 2019-04-22 | 2024-03-12 | 浙江万胜智能科技股份有限公司 | Voltage equalizing circuit for power converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20191231 Effective date of abandoning: 20240312 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20191231 Effective date of abandoning: 20240312 |