CN206283415U - A kind of improved switch power source driving circuit - Google Patents
A kind of improved switch power source driving circuit Download PDFInfo
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- CN206283415U CN206283415U CN201621169820.4U CN201621169820U CN206283415U CN 206283415 U CN206283415 U CN 206283415U CN 201621169820 U CN201621169820 U CN 201621169820U CN 206283415 U CN206283415 U CN 206283415U
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Abstract
The utility model is related to the technical field of switch drive, refers in particular to a kind of improved switch power source driving circuit.It includes transformer T, first switch circuit and second switch circuit, and the transformer T includes the first winding, the second winding, the tertiary winding and the 4th winding；The Same Name of Ends of first winding is connected with first switch circuit, and the different name end of first winding is connected with second switch circuit；Same Name of Ends of the second switch circuit respectively with the second winding, the tertiary winding and the 4th winding is connected；The different name end of the 4th winding is connected with input signal end.A kind of improved switch power source driving circuit that the utility model is provided, realize the driving of Switching Power Supply using the first winding, the second winding, the tertiary winding, the 4th winding and the coupled modes between first switch circuit and second switch circuit, it is low cost, efficiency high, highly reliable.
Description
Technical field
The utility model is related to the technical field of switch drive, refers in particular to a kind of improved switch power source driving circuit.
Background technology
At present, the isolation conventional method majority of existing Switching Power Supply Shangguan driver circuit is to use the driving for carrying isolation
Chip, carries the treatment of the powered-down coupler of isolation and isolated from power inside it；Or closed using isolation is come with inside driving chip
Electric coupler but the isolation processing on power supply is not done, in addition it is also necessary to increase insulating power supply in outside, i.e., directly use isolating transformer；
But above method use cost is higher.
Utility model content
The utility model provides a kind of improved switch power source driving circuit for problem of the prior art, using transformer
Coupled modes between winding realize the driving of Switching Power Supply, low cost, efficiency high, highly reliable.
In order to solve the above-mentioned technical problem, the utility model is adopted the following technical scheme that：
The utility model provide a kind of improved switch power source driving circuit, including transformer T, first switch circuit with
And second switch circuit, the transformer T includes the first winding, the second winding, the tertiary winding and the 4th winding；Described first
The Same Name of Ends of winding is connected with first switch circuit, and the different name end of first winding is connected with second switch circuit；Described
Same Name of Ends of two on-off circuits respectively with the second winding, the tertiary winding and the 4th winding is connected；The different name end of the 4th winding
It is connected with input signal end.
Wherein, the first switch circuit includes metal-oxide-semiconductor Q1, resistance R1, triode Q4 and diode D3, the metal-oxide-semiconductor
The source electrode of Q1 is connected with the Same Name of Ends of the first winding；The grid of the metal-oxide-semiconductor Q1 is connected with one end of resistance R1, the resistance R1
The other end be connected with second switch circuit；The grid of the metal-oxide-semiconductor Q is connected with the emitter stage of triode Q4, the triode
The colelctor electrode of Q4 is connected with the positive pole of diode D3, the negative pole of the diode D3, the base stage of triode Q4 respectively with resistance R1
The other end connection.
Wherein, the second switch circuit includes metal-oxide-semiconductor Q2, resistance R3, triode Q5 and electric capacity C2, the metal-oxide-semiconductor Q2
Drain electrode be connected with the different name end of the first winding；The source electrode of the metal-oxide-semiconductor Q2 respectively with the second winding, the Same Name of Ends of the tertiary winding
Connection；The grid of the metal-oxide-semiconductor Q2 is connected with one end of resistance R3, the other end of the resistance R3 and the Same Name of Ends of the 4th winding
Connection；The base stage of the triode Q5 is connected with the Same Name of Ends of the 4th winding, and the emitter stage of the triode Q5 is with metal-oxide-semiconductor Q2's
Grid is connected, and the colelctor electrode of the triode Q5 is connected with the source electrode of metal-oxide-semiconductor Q2；The other end of the resistance R1 is with electric capacity C2's
One end connects, and the other end of the electric capacity C2 is connected with the Same Name of Ends of the 4th winding.
Wherein, the different name end ground connection of second winding.
Wherein, also including resistance R4, the different name end of the tertiary winding is connected with one end of resistance R4, the resistance R4's
The other end is grounded.
Wherein, the turn ratio of first winding, the second winding, the tertiary winding and the 4th winding is equal.
The beneficial effects of the utility model：
A kind of improved switch power source driving circuit that the utility model is provided, using the first winding, the second winding, the 3rd
Winding, the 4th winding and the coupled modes between first switch circuit and second switch circuit realize the driving of Switching Power Supply, into
It is this low, efficiency high, highly reliable.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of improved switch power source driving circuit of the present utility model.
Reference in Fig. 1 includes：
1-transformer T 2-first switch circuit 3-second switch circuits
4-the first winding 6-tertiary winding of the 5-the second winding
7-the four 8-input signal of winding end.
Specific embodiment
For the ease of the understanding of those skilled in the art, further is made to the utility model with reference to embodiment and accompanying drawing
Explanation, the content that implementation method is referred to is not to restriction of the present utility model.The utility model is carried out below in conjunction with accompanying drawing 1
Detailed description.
A kind of improved switch power source driving circuit described in the present embodiment, including transformer T1, first switch circuit 2 with
And second switch circuit 3, the transformer T1 includes the first winding 4, the second winding 5, the winding 7 of the tertiary winding 6 and the 4th；Institute
The Same Name of Ends for stating the first winding 4 is connected with first switch circuit 2, and different name end and the second switch circuit 3 of first winding 4 connect
Connect；Same Name of Ends of the second switch circuit 3 respectively with the second winding 5, the winding 7 of the tertiary winding 6 and the 4th is connected；Described 4th
The different name end of winding 7 is connected with input signal end 8.
Specifically, when the no signal of input signal end 8 is input into, second winding 5 of transformer T1, the tertiary winding 6 and the 4th
Voltage on winding 7 is equal to the voltage of the first winding 4；The different name end of the 4th winding 7 of transformer T1 connects with input signal end 8
Connect, when the drive signal at input signal end 8 is high level, the voltage of the Same Name of Ends of the 4th winding 7 is also correspondingly lifted to
The high level voltage value at input signal end 8, now the Same Name of Ends of the 4th winding 7 and the first winding 4, the second winding 5 and the 3rd around
The voltage of the Same Name of Ends of group 6 produces voltage difference, and this voltage difference is drive signal voltage, drives second switch circuit 3 to work；And then
Drive first switch circuit 2.
Specifically, when the drive signal at input signal end 8 switchs to low level from high level, the second of the transformer T1
Winding 5, the voltage of the winding 7 of the tertiary winding 6 and the 4th are equal to the voltage of the first winding 4, now the Same Name of Ends of the 4th winding 7 and the
Voltage difference on one winding 4, the second winding 5, the Same Name of Ends of the tertiary winding 6 is zero, shut-off second switch circuit 3；And then turn off
First switch circuit 2.
A kind of improved switch power source driving circuit described in the present embodiment, the first switch circuit 2 includes metal-oxide-semiconductor
Q1, resistance R1, triode Q4 and diode D3, the source electrode of the metal-oxide-semiconductor Q1 are connected with the Same Name of Ends of the first winding 4；The MOS
The grid of pipe Q1 is connected with one end of resistance R1, and the other end of the resistance R1 is connected with second switch circuit 3；The metal-oxide-semiconductor Q
Grid be connected with the emitter stage of triode Q4, the colelctor electrode of the triode Q4 is connected with the positive pole of diode D3, described two
The other end of the negative pole of pole pipe D3, the base stage of triode Q4 respectively with resistance R1 is connected.
A kind of improved switch power source driving circuit described in the present embodiment, the second switch circuit 3 includes metal-oxide-semiconductor
Q2, resistance R3, the drain electrode of triode Q5 and electric capacity C2, the metal-oxide-semiconductor Q2 are connected with the different name end of the first winding 4；The metal-oxide-semiconductor
Same Name of Ends of the source electrode of Q2 respectively with the second winding 5, the tertiary winding 6 is connected；The grid of the metal-oxide-semiconductor Q2 and one end of resistance R3
Connection, the other end of the resistance R3 is connected with the Same Name of Ends of the 4th winding 7；The base stage of the triode Q5 and the 4th winding 7
Same Name of Ends connection, the emitter stage of the triode Q5 is connected with the grid of metal-oxide-semiconductor Q2, the colelctor electrode of the triode Q5 and
The source electrode connection of metal-oxide-semiconductor Q2；The other end of the resistance R1 is connected with one end of electric capacity C2, the other end of the electric capacity C2 and
The Same Name of Ends connection of four windings 7.
A kind of improved switch power source driving circuit described in the present embodiment, the different name end ground connection of second winding 5.
A kind of improved switch power source driving circuit described in the present embodiment, also including resistance R4, the tertiary winding 6
Different name end is connected with one end of resistance R4, the other end ground connection of the resistance R4.
A kind of improved switch power source driving circuit described in the present embodiment, first winding 4, the second winding the 5, the 3rd
The turn ratio of the winding 7 of winding 6 and the 4th is equal.
Specifically, when metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 are not turned on, second winding 5 of transformer T1, the tertiary winding 6 and the 4th
Voltage on winding 7 is equal to the voltage of the first winding 4；The different name end of the 4th winding 7 of transformer T1 connects with input signal end 8
Connect, when the drive signal at input signal end 8 is high level, the voltage of the Same Name of Ends of the 4th winding 7 is also correspondingly lifted to
The high level voltage value at input signal end 8, now the Same Name of Ends of the 4th winding 7 and the first winding 4, the second winding 5 and the 3rd around
The voltage of the Same Name of Ends of group 6 produces voltage difference, and this voltage difference is drive signal voltage；Now, resistance R3 is driving resistance, because
Same Name of Ends of the source electrode of metal-oxide-semiconductor Q2 respectively with the second winding 5 and the tertiary winding 6 is connected, the grid of metal-oxide-semiconductor Q2 and the one of resistance R3
End connection, the other end of resistance R3 is connected with the Same Name of Ends of the 4th winding 7, so as to be directly realized by the conducting of metal-oxide-semiconductor Q2；Now,
Resistance R1 also to drive resistance, also because the source electrode of metal-oxide-semiconductor Q1 is connected with the Same Name of Ends of the first winding 4, the grid of metal-oxide-semiconductor Q1 and
One end connection of resistance R1, the other end of resistance R1 is connected with one end of electric capacity C2, the other end of electric capacity C2 and the 4th winding 7
Same Name of Ends is connected, so as to realize the conducting of metal-oxide-semiconductor Q1.
Specifically, when the drive signal at input signal end 8 switchs to low level from high level, the second of the transformer T1
Winding 5, the voltage of the winding 7 of the tertiary winding 6 and the 4th are equal to the voltage of the first winding 4, now the Same Name of Ends of the 4th winding 7 and the
Voltage difference on one winding 4, the second winding 5, the Same Name of Ends of the tertiary winding 6 is zero, i.e. energy between metal-oxide-semiconductor Q2 passes through resistance
R3, the 4th winding 7 discharge, and when the voltage difference at resistance R3 two ends gets to 0.7V, reach the conduction voltage drop of triode Q5, triode
Q5 conductings continue to discharge the energy between metal-oxide-semiconductor Q2, so as to turn off metal-oxide-semiconductor Q2；Energy between the metal-oxide-semiconductor Q1 passes through resistance
R1, electric capacity C2 and the 4th winding 7 discharge, and when the voltage difference at resistance R1 two ends gets to 0.7V, reach the conducting of triode Q4
Pressure drop, triode Q4 conductings continue to discharge the energy between metal-oxide-semiconductor Q1, when the voltage of the negative pole of diode D3 is pulled low in two poles
During the voltage 0.7 of the positive pole of pipe D3, D3 conductings, so that the energy between metal-oxide-semiconductor Q1 continues to discharge, so as to turn off MOS
Pipe Q1.
The above, is only the utility model preferred embodiment, not makees any formal to the utility model
Limitation, although the utility model is disclosed as above with preferred embodiment, but is not limited to the utility model, any to be familiar with sheet
Technical professional, is not departing from the range of technical solutions of the utility model, when the technology contents using the disclosure above are made
A little change is modified to the Equivalent embodiments of equivalent variations, as long as being without departing from technical solutions of the utility model content, foundation
The utility model technology refers to any simple modification, equivalent variations and the modification made to above example, belongs to this practicality
In the range of new technique scheme.
Claims (6)
1. a kind of improved switch power source driving circuit, it is characterised in that：Including transformer T, first switch circuit and second
On-off circuit, the transformer T includes the first winding, the second winding, the tertiary winding and the 4th winding；First winding
Same Name of Ends is connected with first switch circuit, and the different name end of first winding is connected with second switch circuit；The second switch
Same Name of Ends of the circuit respectively with the second winding, the tertiary winding and the 4th winding is connected；The different name end of the 4th winding and input
Signal end is connected.
2. a kind of improved switch power source driving circuit according to claim 1, it is characterised in that：The first switch electricity
Road includes that the source electrode of metal-oxide-semiconductor Q1, resistance R1, triode Q4 and diode D3, the metal-oxide-semiconductor Q1 and the Same Name of Ends of the first winding connect
Connect；The grid of the metal-oxide-semiconductor Q1 is connected with one end of resistance R1, and the other end of the resistance R1 is connected with second switch circuit；
The grid of the metal-oxide-semiconductor Q is connected with the emitter stage of triode Q4, and the colelctor electrode of the triode Q4 connects with the positive pole of diode D3
Connect, the other end of the negative pole of the diode D3, the base stage of triode Q4 respectively with resistance R1 is connected.
3. a kind of improved switch power source driving circuit according to claim 2, it is characterised in that：The second switch electricity
Road includes that the drain electrode of metal-oxide-semiconductor Q2, resistance R3, triode Q5 and electric capacity C2, the metal-oxide-semiconductor Q2 connects with the different name end of the first winding
Connect；Same Name of Ends of the source electrode of the metal-oxide-semiconductor Q2 respectively with the second winding, the tertiary winding is connected；The grid of the metal-oxide-semiconductor Q2 and electricity
One end connection of R3 is hindered, the other end of the resistance R3 is connected with the Same Name of Ends of the 4th winding；The base stage of the triode Q5 with
The Same Name of Ends connection of the 4th winding, the emitter stage of the triode Q5 is connected with the grid of metal-oxide-semiconductor Q2, the collection of the triode Q5
Electrode is connected with the source electrode of metal-oxide-semiconductor Q2；The other end of the resistance R1 is connected with one end of electric capacity C2, and the electric capacity C2's is another
End is connected with the Same Name of Ends of the 4th winding.
4. a kind of improved switch power source driving circuit according to claim 1, it is characterised in that：Second winding
Different name end is grounded.
5. a kind of improved switch power source driving circuit according to claim 1, it is characterised in that：Also include resistance R4,
The different name end of the tertiary winding is connected with one end of resistance R4, the other end ground connection of the resistance R4.
6. a kind of improved switch power source driving circuit according to claim 1, it is characterised in that：First winding,
The turn ratio of the second winding, the tertiary winding and the 4th winding is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621169820.4U CN206283415U (en) | 2016-11-02 | 2016-11-02 | A kind of improved switch power source driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621169820.4U CN206283415U (en) | 2016-11-02 | 2016-11-02 | A kind of improved switch power source driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206283415U true CN206283415U (en) | 2017-06-27 |
Family
ID=59082401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621169820.4U Active CN206283415U (en) | 2016-11-02 | 2016-11-02 | A kind of improved switch power source driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206283415U (en) |
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2016
- 2016-11-02 CN CN201621169820.4U patent/CN206283415U/en active Active
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