CN206894505U - A kind of switching power unit - Google Patents
A kind of switching power unit Download PDFInfo
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- CN206894505U CN206894505U CN201621434011.1U CN201621434011U CN206894505U CN 206894505 U CN206894505 U CN 206894505U CN 201621434011 U CN201621434011 U CN 201621434011U CN 206894505 U CN206894505 U CN 206894505U
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Abstract
A kind of switching power unit, including rectifier circuit, pulse transformer T, switch transistor T 1, secondary commutating circuit, first resistor R1, second resistance R2,3rd resistor R3, the 3rd electric capacity and control unit.Rectifier circuit includes：First diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the first electric capacity C1 and the second electric capacity C2.Pulse transformer T includes first side winding L1, iron core T and secondary side winding L2.Secondary commutating circuit includes the 5th diode D5, the first magnetic bead SC1, the 6th diode D6, the second magnetic bead SC2, the 4th electric capacity C4, the 4th resistance R4, inductance L and the 5th electric capacity C5.A kind of switching power unit provided by the utility model, there is the characteristics of effectively suppressing its own electromagnetic disturbance, can be applied to the electronic instrument or equipment of precision.
Description
Technical field
A kind of switching power unit is the utility model is related to, belongs to on-off circuit technical field.
Background technology
In recent years, as the development of Power Electronic Technique, Switching Power Supply are wide with small-sized, light weight and efficient feature
It is general be applied to industrial automatic control, military industry equipment, research equipment, LED illumination, industrial control equipment, communication apparatus, power equipment,
The fields such as instrument and meter.
But compared with linear power supply, because Switching Power Supply is to realize that voltage becomes using the high speed break-make of semiconductor devices
Change, and the time ratio turned on and off by controlling switch pipe, to maintain regulated output voltage, therefore in power circuit easily
Produce stronger conduction and electromagnetic radiation harassing and wrecking, not only can interference load, can also produce interference to other electronic equipments of surrounding,
Influence its use in precision instrument and equipment.
The content of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of switching power unit, can be had
Effect suppresses the electromagnetic disturbance of its own, can be applied to the electronic instrument or equipment of precision.
In order to solve the above-mentioned technical problem, the utility model is to be achieved through the following technical solutions：
A kind of switching power unit, including：Rectifier circuit, pulse transformer, switching tube, secondary commutating circuit, first
Resistance, second resistance, 3rd resistor, the 3rd electric capacity and control unit.One end connection arteries and veins of the output end of the rectifier circuit
Rush the first winding of transformer, the emitter stage of other end connecting valve pipe；The one of the colelctor electrode connection pulse transformer of switching tube
The other end of secondary winding；The output end of the base stage connection control unit of switching tube；3rd electric capacity and 3rd resistor series connection, the 3rd electricity
The colelctor electrode of the other end connecting valve pipe of appearance, the emitter stage of the other end connecting valve pipe of 3rd resistor and ground connection；Pulse becomes
The input of the secondary winding connecting secondary commutating circuit of depressor；First resistor and second resistance divider resistance in series, the
One resistance and the tie point of second resistance connect the input of control unit jointly；The other end connection inductance and the 5th of first resistor
Electric capacity；The other end ground connection of second resistance.
The rectifier circuit includes：First diode, the second diode, the 3rd diode, the 4th diode, the first electricity
Appearance and the second electric capacity.The anode of first diode is connected electric network source phase line L ends jointly with the negative electrode of the 3rd diode；Two or two
The negative electrode of the anode of pole pipe and the 4th diode is connected and the mains neutral line N-terminal that gets access to grid jointly；The negative electrode of first diode and
The negative electrode of second diode is connected and connects one end of the first winding of pulse transformer jointly；The anode of 4th diode and
The anode of three diodes is connected and the emitter stage of common connecting valve pipe；The both ends of first electric capacity the moon with the first diode respectively
Pole, the anode of the 4th diode are connected；First electric capacity is in parallel with the second electric capacity；Rectifier circuit inputs the exchange of electric network source
Vin is converted into direct current, and after the filtering by the first electric capacity, is transferred to the primary side of pulse transformer.
The pulse transformer includes：First side winding L1, iron core T and secondary side winding L2；First side winding L1 one end
It is connected with the negative electrode of the first diode, the first side winding L1 other ends are connected with the colelctor electrode of switching tube；Secondary side winding L2 mono-
End is connected with the first magnetic bead SC1 one end, other end ground connection.
The secondary commutating circuit includes：5th diode, the first magnetic bead SC1, the 6th diode, the second magnetic bead SC2,
Four electric capacity, the 4th resistance, inductance L and the 5th electric capacity；4th electric capacity and the 4th resistant series, the both ends of the series arm respectively with
First magnetic bead SC1 one end connects with the 5th diode anode, can suppress surge voltage；5th diode cathode and the six or two pole
The negative electrode of pipe is connected and connects inductance L one end jointly；Second magnetic bead SC2 one end connects with the anode of the 6th diode, the
Two magnetic bead SC2 other end ground connection, the reverse surge current of the 5th diode can be suppressed；One end connection inductance of 5th electric capacity
The other end；The other end ground connection of 5th electric capacity；The filter network that 6th diode, inductance L and the 5th electric capacity are formed, it can reduce straight
Ripple in stream output.
The first resistor and second resistance form divider resistance.First resistor R1 and second resistance series connection, and with the 5th
Electric capacity is in parallel；The input of second resistance one end and control unit connects, other end ground connection；Pass through first resistor and the second electricity
Resistance, the sampling to direct current output can be achieved；According to the numerical value of sampling, the time of the turn-on and turn-off of control unit adjusting switch pipe
Than to control the value stabilization of direct current output in setting value, and then forming negative-feedback.
The 3rd electric capacity C3 and 3rd resistor R3 series connection, the both ends of the series arm respectively with the colelctor electrode of switching tube and
The radiation of switching tube is extremely connected, and can absorb surge voltage caused by switching tube turn-on and turn-off moment.
The second electric capacity C2 is a high frequency capacitance, to reduce high-frequency resistance, it is possible to reduce high frequency electric is with differential mode
Conduction interference caused by form.
4th electric capacity C4 and the 4th resistance the R4 series connection, can suppress surge voltage.
Compared with prior art, the beneficial effects of the utility model are：The utility model provides a kind of Switching Power Supply dress
Put, there is the characteristics of effectively suppressing its own electromagnetic disturbance, can be applied to the electronic instrument or equipment of precision.
Brief description of the drawings
Fig. 1 is apparatus structure schematic diagram of the present utility model.
Embodiment
Specific embodiment of the present utility model is as shown in Figure 1.
A kind of switching power unit of the present embodiment, including rectifier circuit, pulse transformer T, switch transistor T 1, secondary rectification
Loop, first resistor R1, second resistance R2,3rd resistor R3, the 3rd electric capacity C3 and control unit.
The first winding of one end connection pulse transformer of the output end of rectifier circuit in the present embodiment, the other end connect
Connect the emitter stage of switch transistor T 1；The other end of the colelctor electrode connection pulse transformer T of switch transistor T 1 first winding；Switching tube
Base stage connects the output end of control unit；3rd electric capacity C3 and 3rd resistor R3 series connection, the 3rd electric capacity C3 other end connection are opened
Close pipe T1 colelctor electrode, 3rd resistor R3 other end connecting valve pipe T1 emitter stage and ground connection；3rd electric capacity C3 and the 3rd
Radiation of the both ends for the series arm that resistance R3 is formed respectively with the colelctor electrode and switching tube of switching tube is extremely connected, and can absorb switch
Surge voltage caused by pipe turn-on and turn-off moment.
The input of the secondary winding L2 connecting secondary commutating circuits of pulse transformer T in the present embodiment；First resistor
R1 and second resistance R2 series connection, first resistor R1 and second resistance R2 tie point connect the output end of control unit jointly；First
Resistance R1 other end connection inductance L and the 5th electric capacity C5；Second resistance R2 other end ground connection.
Rectifier circuit in the present embodiment includes：First diode D1, the second diode D2, the 3rd diode D3,
Four diode D4, the first electric capacity C1 and the second electric capacity C2；The negative electrode of first diode D1 anode and the 3rd diode D3 is common
Connect electric network source phase line L ends；Second diode D2 anode and the 4th diode D4 negative electrode are connected and the electricity that gets access to grid jointly
Source neutral conductor N-terminal；First diode D1 negative electrode and the second diode D2 negative electrode are connected and connect pulse transformer T's jointly
First winding L1 one end；4th diode D4 anode and the 3rd diode D3 anode are connected and common connecting valve pipe T1
Emitter stage；The negative electrode with the first diode D1, the 4th diode D4 anode are connected respectively at first electric capacity C1 both ends；First
Electric capacity C1 is in parallel with the second electric capacity C2.Second electric capacity C2 is a high frequency capacitance, to reduce high-frequency resistance, it is possible to reduce high frequency
Conduction interference of the electric current caused by the form of differential mode.
The pulse transformer T includes：First side winding L1, iron core T and secondary side winding L2.First side winding L1 one end
It is connected with the first diode D1 negative electrode, the first side winding L1 other ends are connected with the colelctor electrode of switch transistor T 1；Secondary side winding
L2 one end is connected with the first magnetic bead SC1 one end, other end ground connection.
The secondary commutating circuit includes：5th diode D5, the first magnetic bead SC1, the 6th diode D6, the second magnetic bead
SC2, the 4th electric capacity C4, the 4th resistance R4, inductance L and the 5th electric capacity C5.4th electric capacity C4 and the 4th resistance R4 series connection, can press down
Surge voltage processed；The both ends of the series arm are connected with the first magnetic bead SC1 one end and the 5th diode D5 anodes respectively,
Surge voltage can be suppressed；5th diode D5 negative electrodes and the 6th diode D6 negative electrode are connected and connect inductance L one end jointly；
Second magnetic bead SC2 one end connects with the 6th diode D6 anode, the second magnetic bead SC2 other end ground connection, can suppress two poles
Pipe D5 reverse surge current；The other end of 5th electric capacity C5 one end connection inductance；5th electric capacity C5 other end ground connection；The
The filter network that six diode D6, inductance L and the 5th electric capacity C5 are formed, can reduce the ripple in direct current output.
The first resistor R1 and second resistance R2 form divider resistance.
Claims (7)
1. a kind of switching power unit, it is characterised in that described device includes：Rectifier circuit, pulse transformer, switching tube,
Secondary commutating circuit, first resistor, second resistance, 3rd resistor, the 3rd electric capacity and control unit；The output end of rectifier circuit
One end connection pulse transformer first winding, the emitter stage of other end connecting valve pipe；The colelctor electrode connection arteries and veins of switching tube
Rush the other end of the first winding of transformer；The output end of the base stage connection control unit of switching tube；3rd electric capacity and the 3rd electricity
Resistance series connection, the colelctor electrode of the other end connecting valve pipe of the 3rd electric capacity, the emitter stage of the other end connecting valve pipe of 3rd resistor
And it is grounded；The input of the secondary winding connecting secondary commutating circuit of pulse transformer；First resistor and second resistance series connection structure
Into divider resistance, the tie point of first resistor and second resistance connects the input of control unit jointly；The other end of first resistor
Connect inductance and the 5th electric capacity；The other end ground connection of second resistance.
2. a kind of switching power unit according to claim 1, it is characterised in that the rectifier circuit includes：First
Diode, the second diode, the 3rd diode, the 4th diode, the first electric capacity and the second electric capacity；The anode of first diode with
The negative electrode of 3rd diode connects electric network source phase line L ends jointly；The negative electrode phase of the anode of second diode and the 4th diode
Company and the mains neutral line N-terminal that gets access to grid jointly；The negative electrode of the negative electrode of first diode and the second diode is connected and connected jointly
One end of the first winding of pulse transformer；The anode of 4th diode and the anode of the 3rd diode are connected and connection is opened jointly
Close the emitter stage of pipe；The negative electrode with the first diode, the anode of the 4th diode are connected respectively at the both ends of first electric capacity；First electricity
Hold in parallel with the second electric capacity；The exchange input Vin of electric network source is converted into direct current by rectifier circuit, and passes through the first electric capacity
After filtering, the primary side of pulse transformer is transferred to.
3. a kind of switching power unit according to claim 1, it is characterised in that the pulse transformer includes：Once
Side winding L1 and secondary side winding L2；First side winding L1 one end is connected with the negative electrode of the first diode, and first side winding L1 is another
One end is connected with the colelctor electrode of switching tube；Secondary side winding L2 one end is connected with the first magnetic bead SC1 one end, other end ground connection.
4. a kind of switching power unit according to claim 1, it is characterised in that the secondary commutating circuit includes：The
Five diodes, the first magnetic bead SC1, the 6th diode, the second magnetic bead SC2, the 4th electric capacity, the 4th resistance, inductance and the 5th electric capacity；
4th electric capacity and the 4th resistant series, the both ends of the series arm are positive with the first magnetic bead SC1 one end and the 5th diode respectively
Pole connects, and can suppress surge voltage；The negative electrode of 5th diode and the negative electrode of the 6th diode are connected and connect inductance L's jointly
One end；Second magnetic bead SC2 one end connects with the anode of the 6th diode, the second magnetic bead SC2 other end ground connection, can suppress the
The reverse surge current of five diodes；The other end of one end connection inductance of 5th electric capacity；The other end ground connection of 5th electric capacity；The
The filter network that six diodes, inductance and the 5th electric capacity are formed, can reduce the ripple in direct current output.
5. a kind of switching power unit according to claim 1, it is characterised in that the 3rd electric capacity and 3rd resistor string
Connection, the radiation of the both ends of the series arm respectively with the colelctor electrode and switching tube of switching tube are extremely connected, can absorb switching tube and turn on
With shutdown moment caused by surge voltage.
A kind of 6. switching power unit according to claim 2, it is characterised in that first electric capacity strobes,
Second electric capacity is a high frequency capacitance, to reduce high-frequency resistance, it is possible to reduce high frequency electric is caused by the form of differential mode
Conduction interference.
7. a kind of switching power unit according to claim 4, it is characterised in that the 4th electric capacity and the 4th resistance string
Connection, can suppress surge voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621434011.1U CN206894505U (en) | 2016-12-26 | 2016-12-26 | A kind of switching power unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621434011.1U CN206894505U (en) | 2016-12-26 | 2016-12-26 | A kind of switching power unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206894505U true CN206894505U (en) | 2018-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621434011.1U Expired - Fee Related CN206894505U (en) | 2016-12-26 | 2016-12-26 | A kind of switching power unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206894505U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026571A (en) * | 2016-12-26 | 2017-08-08 | 国网江西省电力公司电力科学研究院 | A kind of switching power unit |
| CN109442595A (en) * | 2018-11-05 | 2019-03-08 | 广东美的制冷设备有限公司 | Air conditioner and its outdoor unit control circuit |
-
2016
- 2016-12-26 CN CN201621434011.1U patent/CN206894505U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026571A (en) * | 2016-12-26 | 2017-08-08 | 国网江西省电力公司电力科学研究院 | A kind of switching power unit |
| CN109442595A (en) * | 2018-11-05 | 2019-03-08 | 广东美的制冷设备有限公司 | Air conditioner and its outdoor unit control circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180116 Termination date: 20181226 |