CN204244085U - A kind of switching power circuit - Google Patents
A kind of switching power circuit Download PDFInfo
- Publication number
- CN204244085U CN204244085U CN201420798150.7U CN201420798150U CN204244085U CN 204244085 U CN204244085 U CN 204244085U CN 201420798150 U CN201420798150 U CN 201420798150U CN 204244085 U CN204244085 U CN 204244085U
- Authority
- CN
- China
- Prior art keywords
- voltage
- transformer
- port
- semiconductor
- oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000004065 semiconductor Substances 0.000 claims abstract description 25
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 239000003381 stabilizer Substances 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 230000001131 transforming effect Effects 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Abstract
A kind of switching power circuit, comprise transforming circuit and control circuit, transforming circuit comprises transformer and voltage stabilizing chip, the primary coil input Width funtion signal of transformer, the secondary coil stable output voltage signal of transformer; Control circuit comprises PWM controller, voltage detecting circuit, metal-oxide-semiconductor and current detection circuit, and voltage detecting circuit comprises photoelectrical coupler U11 and voltage-stabiliser tube Q54, and current detection circuit comprises sampling resistor R161.The utility model can realize the input of 36V-92V super wide voltage, binary channels 5V and 15V voltage stabilizing export, and can quick start switch power supply, only need 0.3-2 second start-up time, not only reduce the loss of Switching Power Supply, improve overall efficiency, can reduce costs simultaneously, be suitable for producing in enormous quantities, expanding range of application.
Description
Technical field
The utility model relates to a kind of switching power circuit, in particular, particularly relates to a kind of switching power circuit by step-down, input voltage being transformed into required voltage.
Background technology
Switching Power Supply product is widely used in the fields such as industrial automation, military industry equipment, research equipment, communication apparatus, instrument and meter, household electrical appliances and digital product.Existing market power source is alternating current 220V rectification, filtering, is passed to secondary by switch transformer, then is raised or reduction by voltage through transformer.But market lacks the direct voltage input of ultra-wide, the direct current that two-way is low exports, very inconvenient in some application, is badly in need of a kind of Novel switch power circuit and solves.
Utility model content
The utility model, in order to overcome the deficiency of above technology, provides a kind of switching power circuit, and can realize super wide voltage input, binary channels voltage stabilizing exports, and energy quick start switch power supply, decrease the loss of Switching Power Supply, raise the efficiency.
the utility model overcomes the technical scheme that its technical problem adopts:
A kind of switching power circuit, comprise transforming circuit and control circuit, described transforming circuit comprises transformer and voltage stabilizing chip, the primary coil input Width funtion signal of described transformer, the secondary coil stable output voltage signal of transformer, described control circuit comprises PWM controller, voltage detecting circuit, metal-oxide-semiconductor and current detection circuit, described voltage detecting circuit comprises photoelectrical coupler U11 and voltage-stabiliser tube Q54, current detection circuit comprises sampling resistor R161, the HV port of described PWM controller 3 is connected with the positive pole of bulky capacitor C77, VCC port is connected with 3 pin of transformer, COMP port is connected with output after the secondary coil voltage rectification of transformer by photoelectrical coupler U11, RT port is connected through frequency modulation resistance R155 and power supply, CS port is connected with the sampling resistor R161 of current detection circuit, OUT port is connected with the grid of metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor is connected with 2 pin of transformer, the source electrode of metal-oxide-semiconductor is connected through sampling resistor R161 and power supply.
Preferred according to the utility model, 5 pin of described transformer export a feedback voltage after resistance R153, electric capacity C87, C90 and diode D33 rectification, be connected to port JC, 5 pin of transformer are connected with the input of voltage stabilizing chip after inductance L 3, L4 filtering through resistance R153, electric capacity C87, C90 and diode D33 rectification and electric capacity C83, C84; The input anode of photoelectrical coupler U11 is connected with JC port through resistance R164, receive the input cathode of photoelectrical coupler U11 after the input of voltage stabilizing chip is connected with voltage-stabiliser tube Q54 after resistance R167, R166, R168 dividing potential drop again, the output of photoelectrical coupler U11 is connected with the COMP port of PWM controller; Connect with resistance R148 and diode D32 and be connected with the grid of metal-oxide-semiconductor again in OUT port road after resistance R154 of described PWM controller, another road is connected with the base stage of triode Q53, and the collector electrode of described triode Q53 is connected with power supply ground, emitter is connected with the grid of metal-oxide-semiconductor.
Preferred according to the utility model, described PWM controller is LD7575; Described photoelectrical coupler U11 is EL817; Described voltage-stabiliser tube Q54 is TL431.
the beneficial effects of the utility model are:
By switching power circuit of the present utility model, PWM controller controls the duty ratio of drive waveforms according to the voltage that transformer secondary coil exports, by controlling being turned on or off the time of metal-oxide-semiconductor, thus realize the stable of voltage, the utility model can realize the input of 36V-92V super wide voltage, binary channels 5V and 15V voltage stabilizing export, and can quick start switch power supply, only need 0.3-2 second start-up time, not only reduce the loss of Switching Power Supply, improve overall efficiency, can reduce costs simultaneously, be suitable for producing in enormous quantities, expanding range of application.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
In figure, 1, transformer, 2, voltage stabilizing chip, 3, PWM controller, 4, voltage detecting circuit, 5, metal-oxide-semiconductor, 6, current detection circuit.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
As shown in Figure 1, switching power circuit of the present utility model, comprise transforming circuit and control circuit, described transforming circuit comprises transformer 1 and voltage stabilizing chip 2, the primary coil input Width funtion signal of described transformer 1, the secondary coil stable output voltage signal of transformer 1, described transformer is wound with four groups of coils, described control circuit comprises PWM controller 3, voltage detecting circuit 4, metal-oxide-semiconductor 5 and current detection circuit 6, described voltage detecting circuit comprises photoelectrical coupler U11 and voltage-stabiliser tube Q54, and current detection circuit comprises sampling resistor R161.The HV port of described PWM controller 3 is connected with the positive pole of bulky capacitor thus provides control electric current for PWM controller, VCC port is connected with 3 pin of transformer, COMP port is connected with output after the secondary coil voltage rectification of transformer by photoelectrical coupler U11, RT port is connected through frequency modulation resistance R155 and power supply, CS port is connected with the sampling resistor R161 of current detection circuit the electric current fetching and detect metal-oxide-semiconductor 5, and OUT port is connected with the grid of metal-oxide-semiconductor; The drain electrode of metal-oxide-semiconductor 5 is connected with 2 pin of transformer, and the source electrode of metal-oxide-semiconductor 5 is connected through sampling resistor R161 and power supply.Connect with resistance R148 and diode D32 and be connected with the grid of metal-oxide-semiconductor again in OUT port road after resistance R154 of described PWM controller 3, another road is connected with the base stage of triode Q53, and the collector electrode of described triode Q53 is connected with power supply ground, emitter is connected with the grid of metal-oxide-semiconductor.In the present embodiment, PWM controller 3 is LD7575, and photoelectrical coupler U11 is EL817, and voltage-stabiliser tube Q54 is TL431.
The operation principle of the present embodiment switching power circuit:
The input DYKZ of the present embodiment switching power circuit inputs the Width funtion signal of 36-92V; after resistance R139 overcurrent protection, anti-reverse power connection diode D26 and storage capacitor C77; be divided into two-way: a road is directly connected with the primary coil of transformer 1; another road enters the HV port of PWM controller through starting resistance R140; 3 pin of transformer 1 induce voltage simultaneously; triode D31 conducting, the VCC port of PWM controller switches on power and starts working.Secondary coil 7,8 pin of transformer 1 first after resistance R137, electric capacity C74, C75, diode D27 rectification, then receives the output of this circuit after the π shape filter circuit filtering be made up of electric capacity C78, C79, inductance L 1, L2; Secondary coil 5,6 pin of transformer 1 exports a feedback voltage after resistance R153, electric capacity C87, C90, diode D33 rectification, be connected to port JC, then be connected with the input of voltage stabilizing chip 2 after the π shape filter circuit filtering be made up of C83, C84, inductance L 3, L4.Described port JC is connected with the input anode of photoelectrical coupler U11 through resistance R164, the input of voltage stabilizing chip 2 is through resistance R167, R166, R168 dividing potential drop, the input cathode of photoelectrical coupler U11 is received on another road again after being connected with voltage-stabiliser tube Q54, when port JC voltage is greater than the reference voltage of voltage-stabiliser tube Q54, photoelectrical coupler U11 conducting, at this moment the COMP port ground connection of PWM controller, OUT port is opened, metal-oxide-semiconductor 5 conducting, transformer work; When port JC voltage is less than the reference voltage of voltage-stabiliser tube Q54, photoelectrical coupler U11 not conducting, metal-oxide-semiconductor 5 disconnects, and transformer does not work.PWM controller 3 controls the duty ratio of drive waveforms according to the voltage that transformer secondary coil exports, by controlling being turned on or off the time of metal-oxide-semiconductor 5, thus realizing the stable of voltage, the utility model can realize the input of 36V-92V super wide voltage, and binary channels 5V and 15V voltage stabilizing export, and can quick start switch power supply, only need 0.3-2 second start-up time, not only reduce the loss of Switching Power Supply, improve overall efficiency, can reduce costs simultaneously, be suitable for producing in enormous quantities, expanding range of application.
Claims (3)
1. a switching power circuit, it is characterized in that, comprise transforming circuit and control circuit, described transforming circuit comprises transformer (1) and voltage stabilizing chip (2), the primary coil input Width funtion signal of described transformer (1), the secondary coil stable output voltage signal of transformer (1), described control circuit comprises PWM controller (3), voltage detecting circuit (4), metal-oxide-semiconductor (5) and current detection circuit (6), described voltage detecting circuit comprises photoelectrical coupler U11 and voltage-stabiliser tube Q54, current detection circuit comprises sampling resistor R161, the HV port of described PWM controller (3) is connected with the positive pole of bulky capacitor C77, VCC port is connected with 3 pin of transformer, COMP port is connected with output after the secondary coil voltage rectification of transformer by photoelectrical coupler U11, RT port is connected through frequency modulation resistance R155 and power supply, CS port is connected with the sampling resistor R161 of current detection circuit, OUT port is connected with the grid of metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor (5) is connected with 2 pin of transformer, the source electrode of metal-oxide-semiconductor (5) is connected through sampling resistor R161 and power supply.
2. switching power circuit according to claim 1, it is characterized in that, 5 pin of described transformer (1) export a feedback voltage after resistance R153, electric capacity C87, C90 and diode D33 rectification, be connected to port JC, 5 pin of transformer (1) are connected with the input of voltage stabilizing chip after inductance L 3, L4 filtering through resistance R153, electric capacity C87, C90 and diode D33 rectification and electric capacity C83, C84; The input anode of photoelectrical coupler U11 is connected with port JC through resistance R164, receive the input cathode of photoelectrical coupler U11 after the input of voltage stabilizing chip (2) is connected with voltage-stabiliser tube Q54 after resistance R167, R166, R168 dividing potential drop again, the output of photoelectrical coupler U11 is connected with the COMP port of PWM controller; Connect with resistance R148 and diode D32 and be connected with the grid of metal-oxide-semiconductor again in OUT port road after resistance R154 of described PWM controller (3), another road is connected with the base stage of triode Q53, and the collector electrode of described triode Q53 is connected with power supply ground, emitter is connected with the grid of metal-oxide-semiconductor.
3. switching power circuit according to claim 1 and 2, is characterized in that, described PWM controller (3) is LD7575; Described photoelectrical coupler U11 is EL817; Described voltage-stabiliser tube Q54 is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420798150.7U CN204244085U (en) | 2014-12-17 | 2014-12-17 | A kind of switching power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420798150.7U CN204244085U (en) | 2014-12-17 | 2014-12-17 | A kind of switching power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204244085U true CN204244085U (en) | 2015-04-01 |
Family
ID=52773526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420798150.7U Expired - Fee Related CN204244085U (en) | 2014-12-17 | 2014-12-17 | A kind of switching power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204244085U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849641A (en) * | 2017-03-20 | 2017-06-13 | 常州格力博有限公司 | A kind of mu balanced circuit |
| CN110536185A (en) * | 2019-07-29 | 2019-12-03 | 深圳市翌日科技有限公司 | A kind of comprehensive base station of power circuit and its underground for the comprehensive base station in underground |
-
2014
- 2014-12-17 CN CN201420798150.7U patent/CN204244085U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849641A (en) * | 2017-03-20 | 2017-06-13 | 常州格力博有限公司 | A kind of mu balanced circuit |
| CN110536185A (en) * | 2019-07-29 | 2019-12-03 | 深圳市翌日科技有限公司 | A kind of comprehensive base station of power circuit and its underground for the comprehensive base station in underground |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103281004B (en) | A kind of high power high-voltage pulse electric source circuit | |
| CN101311325A (en) | Two level inverter type MAO power source and output regulation control method thereof | |
| CN103049028B (en) | Constant current source for high voltage magnetic switch resetting | |
| CN204244085U (en) | A kind of switching power circuit | |
| CN103138614A (en) | Double-normal-shock inverter | |
| CN109586583B (en) | Soft switch current feed push-pull type DC-DC converter | |
| CN103313451B (en) | Electromagnetic heating circuit utilizing single-chip microcomputer to automatically track resonant frequency | |
| CN103186106B (en) | A kind of high voltage direct current control switch | |
| CN205141991U (en) | PFC (power factor correction) circuit | |
| CN203896207U (en) | Series switch voltage stabilizing power supply | |
| CN202633175U (en) | Voltage sagging prevention wide voltage alternating current contactor controller based on low voltage capacitance | |
| CN203423625U (en) | Pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit | |
| CN202488366U (en) | Energy-saving ultra-small switch power supply for plug and socket with electronic circuit | |
| CN201821265U (en) | Non-polar isolation reverse converter | |
| CN201657386U (en) | Zero-crossing circuit of microwave oven | |
| CN105515367A (en) | High-step-down DC/DC converter based on a Sepic circuit | |
| CN204334355U (en) | A kind of wide input isolated form three road output switch power source | |
| CN204068693U (en) | A kind of high step-down DC/DC converter based on Sepic circuit | |
| CN204425197U (en) | For the electromagnetic interference denoising device of former limit sampling LED control system | |
| CN204859023U (en) | Low pressure automatic switching circuit | |
| CN204242979U (en) | A kind of control circuit controlling trip coil and drive | |
| CN214205343U (en) | Power supply voltage stabilization control circuit | |
| CN202014199U (en) | Flyback voltage switching circuit | |
| CN203800826U (en) | Power supply device with variable switching frequency | |
| CN202364142U (en) | Simple DC stabilized power supply |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150401 |