CN216531103U - Single-winding multi-output switching power supply - Google Patents
Single-winding multi-output switching power supply Download PDFInfo
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- CN216531103U CN216531103U CN202123197099.3U CN202123197099U CN216531103U CN 216531103 U CN216531103 U CN 216531103U CN 202123197099 U CN202123197099 U CN 202123197099U CN 216531103 U CN216531103 U CN 216531103U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model provides a single-winding multi-output switching power supply, which comprises: the transformer, the rectification filter circuit that is connected with secondary coil electricity in the transformer, first power output, power regulation circuit and feedback circuit that are connected with the rectification filter circuit electricity, the power manager that is connected with the feedback circuit electricity, the power switch that is connected with power manager, transformer in the electricity respectively, the second power output that is connected with the power regulation circuit electricity, and the standby control circuit that is connected with the feedback circuit electricity. The second power output end comprises a load state input end, and the standby control circuit is electrically connected with the load state input end. The logic level input by the load state input end is used for driving the standby control circuit to adjust the feedback voltage fed back by the feedback circuit to the power supply manager, so that the power supply manager controls the power switch to reduce the voltage output by the transformer according to the feedback voltage, the loss of the power supply adjusting circuit can be reduced, and the power consumption of the load during standby is reduced.
Description
[ technical field ] A
The utility model relates to the technical field of switching power supplies, in particular to a single-winding multi-output switching power supply.
[ background ] A method for producing a semiconductor device
As is known, a switching power supply transforms an input power through a transformer, and then outputs the transformed input power through rectification and filtering, wherein an output voltage is fed back through a feedback circuit, and a power manager controls a duty ratio of a power switch to adjust the voltage output by the transformer. However, the current switching power supply has high power consumption when the load is in standby state, and is not suitable for the development trend of energy conservation.
Accordingly, the prior art is in need of improvement and development.
[ Utility model ] content
The utility model aims to provide a single-winding multi-output switching power supply which is used for solving the problem of high power consumption of a load connected with the conventional switching power supply during standby.
The technical scheme of the utility model is as follows: a single winding multiple output switching power supply comprising: the transformer, a rectification filter circuit electrically connected with a secondary coil in the transformer, a first power supply output end, a power supply adjusting circuit and a feedback circuit electrically connected with the rectification filter circuit, a power supply manager electrically connected with the feedback circuit, a power switch electrically connected with the power supply manager and a primary coil in the transformer respectively, a second power supply output end electrically connected with the power supply adjusting circuit and a standby control circuit electrically connected with the feedback circuit; the second power supply output end comprises a load state input end, and the standby control circuit is also electrically connected with the load state input end;
the standby control circuit adjusts feedback voltage fed back to the power supply manager by the feedback circuit according to the logic level fed back by the load state input end; and the power supply manager reduces the voltage output by the transformer through the power switch according to the feedback voltage.
Further, the switching power supply further comprises an output control circuit which is respectively and electrically connected with the rectification filter circuit, the first power supply output end and the load state input end; and the output control circuit controls the power output of the first power output end according to the logic level fed back by the load state input end.
Furthermore, the feedback circuit comprises an optical coupler, a first voltage stabilizing source, a first voltage dividing resistor and a second voltage dividing resistor, the output end of the rectification filter circuit is grounded through the input end of the optical coupler and the first voltage stabilizing source in sequence, and the output end of the rectification filter circuit is grounded through the first voltage dividing resistor and the second voltage dividing resistor in sequence; the reference end of the first voltage-stabilizing source and the input end of the standby control circuit are both electrically connected with the output end of the first voltage-dividing resistor, and the input end of the standby control circuit is connected with the rectifying and filtering circuit.
Further, the standby control circuit comprises a third voltage-dividing resistor and a first switching tube, the output end of the rectification filter circuit is also connected with the output end of the first voltage-dividing resistor through the third voltage-dividing resistor and the first switching tube in sequence, and the grid electrode of the first switching tube is electrically connected with the load state input end; the first voltage dividing resistor and the third voltage dividing resistor form a regulating circuit, and the first switching tube is conducted according to a logic level fed back by the load state input end to reduce the resistance of the regulating circuit.
Furthermore, the power supply adjusting circuit comprises a second voltage-stabilizing source, wherein the anode of the second voltage-stabilizing source is connected with the output end of the rectification filter circuit, the cathode of the second voltage-stabilizing source is connected with the output end of the second power supply, and the reference end of the second voltage-stabilizing source is grounded.
Furthermore, the output control circuit comprises a second switch tube, the second switch tube is connected between the output end of the rectification filter circuit and the output end of the first power supply in series, and the grid electrode of the second switch tube is electrically connected with the input end of the load state.
Furthermore, the output control circuit also comprises a third switching tube and a first resistor, wherein the base electrode of the third switching tube is connected with the load state input end through the first resistor; and the collector electrode of the third switching tube is electrically connected with the grid electrode of the second switching tube.
Furthermore, the output control circuit further comprises a second resistor and a third resistor, the output end of the rectification filter circuit is connected with the collector electrode of the third switch tube through the second resistor and the third resistor in sequence, and the grid electrode of the second switch tube is electrically connected with the input end of the third resistor.
The utility model has the beneficial effects that: compared with the prior art, the utility model drives the standby control circuit to increase the feedback voltage fed back to the power supply manager by the feedback circuit by utilizing the logic level input by the load state input end so as to realize that the power supply manager controls the power switch to reduce the voltage output by the transformer according to the feedback voltage, thereby reducing the loss of the power supply regulation circuit and reducing the power consumption of the power supply during the standby of the load.
[ description of the drawings ]
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic diagram of a portion of the circuit of the present invention.
[ detailed description ] embodiments
The utility model is further described with reference to the following figures and embodiments.
Referring to fig. 1, a switching power supply with single winding and multiple outputs according to an embodiment of the present invention is shown.
The switching power supply with single winding and multiple outputs comprises: the power supply comprises an AC input end 1, an EMI circuit 2 electrically connected with the AC input end 1, a primary side rectifying filter 3 electrically connected with the EMI circuit 2, a transformer T1 electrically connected with the primary side rectifying filter 3, a rectifying filter circuit 4 electrically connected with a secondary coil T1A in a transformer T1, a first power supply output end 11, a power supply adjusting circuit 10 and a feedback circuit 7 electrically connected with the rectifying filter circuit 4, a power supply manager 6 electrically connected with the feedback circuit 7, a power switch 5 electrically connected with the power supply manager 6 and a primary coil in the transformer T1 respectively, a second power supply output end 12 electrically connected with the power supply adjusting circuit 10, and a standby control circuit 8 electrically connected with the feedback circuit 7. The second power supply output terminal 12 includes a load status input terminal PSON, and the standby control circuit 8 is also electrically connected to the load status input terminal PSON.
Thus, when the AC input terminal 1 is connected to a power supply, the power supply is subjected to interference processing by the EMI circuit 2, then subjected to rectification filtering processing by the primary side rectification filtering circuit 3, then subjected to voltage transformation by the transformer T1, further subjected to rectification filtering processing by the rectification filtering circuit 4, and then output from the first power supply output terminal 11, and subjected to voltage stabilization by the power supply adjusting circuit 10, and then output from the second power supply output terminal 12, so that a single winding forms a multi-path output.
And the logic level input by the load state input end PSON is used for driving the standby control circuit 8 to adjust the feedback voltage fed back by the feedback circuit 7 to the power supply manager 6, so that the power supply manager 6 controls the power switch 5 to adjust the voltage output by the transformer T1 according to the feedback voltage, namely when the load is in standby, the feedback voltage fed back by the feedback circuit 7 is increased, namely the voltage output by the transformer T1 is reduced, therefore, the loss of the power supply adjusting circuit 10 can be reduced, the power consumption of the power supply in the load standby state is reduced, and the problem of high power consumption of the load connected with the existing switching power supply in the standby state is solved.
In an embodiment, the switching power supply further includes an output control circuit 9 electrically connected to the rectifying and smoothing circuit 4, the first power output terminal 11, and the load status input terminal PSON, respectively. The output control circuit 9 controls the power output of the first power output terminal 11 according to the logic level fed back by the load status input terminal PSON. Thus, when the load is in standby, the output control circuit 9 disconnects the power output of the first power output terminal 11 according to the logic level fed back by the load status input terminal PSON, and when the load is released from standby, the power output of the first power output terminal 11 is recovered for the user to use.
Specifically, referring to fig. 2, fig. 2 includes a secondary winding T1A of a transformer T1, a rectifying-filtering circuit 4, a feedback circuit 7, a standby control circuit 8, an output control circuit 9, a first power output terminal 11, a second power output terminal 12, and a power regulation circuit 10.
The feedback circuit 7 comprises an optical coupler U1A, a first voltage-stabilizing source U2, a first voltage-dividing resistor R5 and a second voltage-dividing resistor R9, the output end of the rectifying and filtering circuit 4 is grounded through the input end of the optical coupler U1A and the first voltage-stabilizing source U2 in sequence, and the output end of the rectifying and filtering circuit 4 is grounded through the first voltage-dividing resistor R5 and the second voltage-dividing resistor R9 in sequence. The reference end of the first voltage-stabilizing source U2 and the input end of the standby control circuit 8 are both electrically connected with the output end of the first voltage-dividing resistor R5, and the input end of the standby control circuit 8 is connected with the rectifying-filtering circuit 4. The first voltage-stabilizing source U2 adjusts the voltage of the second pin of the optocoupler U1A through the first voltage-dividing resistor R5 and the second voltage-dividing resistor R9, and in cooperation with the optocoupler U1A to collect the voltage output by the rectifying and filtering circuit 4 through the resistor R3, adjusts the brightness of the light emitting diode in the optocoupler U1A, that is, adjusts the magnitude of the feedback voltage from the optocoupler U1A to the power manager 6.
Based on this, the standby control circuit 8 includes a third voltage-dividing resistor R11 and a first switch Q3, the output terminal of the rectifying-smoothing circuit 4 is further connected to the output terminal of the first voltage-dividing resistor R5 through the third voltage-dividing resistor R11 and the first switch Q3 in sequence, and the gate of the first switch Q3 is electrically connected to the load state input terminal PSON. In this way, the first voltage dividing resistor R5 and the third voltage dividing resistor R11 form an adjusting circuit, and when the load is in a standby state, the first switch tube Q3 is turned on according to the logic level fed back by the load state input terminal PSON to reduce the resistance of the adjusting circuit. That is, the voltage output by the first regulator U2 can be reduced, and the voltage difference of the light emitting diode in the optocoupler U1A can be increased, so as to increase the feedback voltage of the optocoupler U1A.
The power supply adjusting circuit 10 comprises a second voltage-stabilizing source U3, wherein the anode of the second voltage-stabilizing source U3 is connected with the output end of the rectifying and filtering circuit 4, the cathode of the second voltage-stabilizing source U3 is connected with the second power supply output end 12, the reference end is grounded, and the output voltage of the transformer T1 is reduced by matching with the standby control circuit 8, so that the power consumption of the second voltage-stabilizing source U3 is reduced, and the effect of reducing the power consumption is achieved.
In an embodiment, the output control circuit 9 includes a second switch Q1, the second switch Q1 is connected in series between the output terminal of the rectifying-smoothing circuit 4 and the first power output terminal 11, and the gate of the second switch Q1 is electrically connected to the load status input terminal PSON. Furthermore, when the load is in standby, the logic level input by the load status input terminal PSON drives the second switch Q1 to turn off, so as to prevent the voltage output from the first power output terminal 11 from affecting the load.
In an embodiment, to reduce the influence of logic level noise of the load state input terminal PSON and improve performance, the output control circuit 9 further includes a third switch Q2, a first resistor R8, a second resistor R4, a third resistor R6, a capacitor C7, and a resistor R10. The base of the third switching tube Q2 is connected to the load state input terminal PSON through the first resistor R8, and the collector of the third switching tube Q2 is electrically connected to the gate of the second switching tube Q1. The output end of the rectifying and filtering circuit 4 is further sequentially connected with the collector of a third switching tube Q2 through a second resistor R4 and a third resistor R6, the gate of the second switching tube Q1 is electrically connected with the input end of a third resistor R6, the two ends of a capacitor C7 and a resistor R10 which are connected in parallel and connected in parallel are respectively connected with the base of the third switching tube Q2 and the ground, so as to filter the logic level input by the load state input end PSON, and by using the third switching tube Q2, when the load is in standby, the third switching tube Q2 is driven to be turned on, so as to pull down the voltage, so that the first switching tube Q3 is turned on, and the second switching tube Q1 is turned off.
In this embodiment, when the load is in standby, the logic level input by the load state input terminal PSON is a low level, and when the load is in operation, the logic level input by the load state input terminal PSON is a high level. The first switch transistor Q3 is a P-channel MOS transistor, the second switch transistor Q1 is an N-channel MOS transistor, and the third switch transistor Q2 is an NPN-type triode. That is, when the load is in standby, the first switching tube Q3 is turned on, the voltage-dividing resistor of the first voltage-stabilizing source U2 is pulled down, the voltage output by the transformer T1 can be reduced through the feedback circuit 7, the power manager 6 and the power switch 5, so as to reduce power consumption, and the second switching tube Q1 and the third switching tube Q2 are turned off, in addition, the standby control circuit 8 has a simple structure and low cost. When the load is started, the second switching tube Q1 and the third switching tube Q2 are turned off and turned on, the first switching tube Q3 is turned off, the voltage-dividing resistance on the first voltage-stabilizing source U2 is increased, that is, the output of the output end of the optocoupler U1A is reduced, the voltage output by the transformer T1 is increased through the power manager 6 and the power switch 5, and the voltage is output by the first power output end 11.
It should be noted that, the first switch tube Q3 may also be turned on when the logic level input by the load state input end PSON is a high level, and the like, and a user may set the logic level according to a requirement, which is not limited herein.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the utility model.
Claims (8)
1. A single-winding, multi-output switching power supply, comprising: the transformer, a rectification filter circuit electrically connected with a secondary coil in the transformer, a first power supply output end, a power supply adjusting circuit and a feedback circuit electrically connected with the rectification filter circuit, a power supply manager electrically connected with the feedback circuit, a power switch electrically connected with the power supply manager and a primary coil in the transformer respectively, a second power supply output end electrically connected with the power supply adjusting circuit and a standby control circuit electrically connected with the feedback circuit; the second power supply output end comprises a load state input end, and the standby control circuit is also electrically connected with the load state input end;
the standby control circuit adjusts feedback voltage fed back to the power supply manager by the feedback circuit according to the logic level fed back by the load state input end; and the power supply manager reduces the voltage output by the transformer through the power switch according to the feedback voltage.
2. The single-winding multi-output switching power supply according to claim 1, further comprising an output control circuit electrically connected to the rectifying and filtering circuit, the first power output terminal, and the load status input terminal, respectively; and the output control circuit controls the power output of the first power output end according to the logic level fed back by the load state input end.
3. The single-winding multi-output switching power supply according to claim 2, wherein the feedback circuit comprises an optical coupler, a first voltage-stabilizing source, a first voltage-dividing resistor and a second voltage-dividing resistor, the output end of the rectifying and filtering circuit is grounded through the input end of the optical coupler and the first voltage-stabilizing source in sequence, and the output end of the rectifying and filtering circuit is grounded through the first voltage-dividing resistor and the second voltage-dividing resistor in sequence; the reference end of the first voltage-stabilizing source and the input end of the standby control circuit are both electrically connected with the output end of the first voltage-dividing resistor, and the input end of the standby control circuit is connected with the rectifying and filtering circuit.
4. The single-winding multi-output switching power supply according to claim 3, wherein the standby control circuit includes a third voltage dividing resistor and a first switching tube, the output terminal of the rectifying and filtering circuit is further connected to the output terminal of the first voltage dividing resistor through the third voltage dividing resistor and the first switching tube in sequence, and the gate of the first switching tube is electrically connected to the load state input terminal; the first voltage dividing resistor and the third voltage dividing resistor form a regulating circuit, and the first switching tube is conducted according to a logic level fed back by the load state input end to reduce the resistance of the regulating circuit.
5. The single-winding multi-output switching power supply according to claim 4, wherein the power supply regulation circuit comprises a second voltage regulator, an anode of the second voltage regulator is connected with the output end of the rectifying and filtering circuit, a cathode of the second voltage regulator is connected with the second power supply output end, and a reference end of the second voltage regulator is grounded.
6. The single-winding multi-output switching power supply according to claim 5, wherein the output control circuit comprises a second switching tube, the second switching tube is connected in series between the output end of the rectifying and filtering circuit and the first power output end, and a gate of the second switching tube is electrically connected to the load state input end.
7. The single-winding multi-output switching power supply according to claim 6, wherein the output control circuit further comprises a third switching tube and a first resistor, and a base of the third switching tube is connected to the load state input end through the first resistor; and the collector electrode of the third switching tube is electrically connected with the grid electrode of the second switching tube.
8. The single-winding multi-output switching power supply according to claim 7, wherein the output control circuit further comprises a second resistor and a third resistor, the output terminal of the rectifying and filtering circuit is further connected to the collector of a third switching tube through the second resistor and the third resistor in sequence, and the gate of the second switching tube is electrically connected to the input terminal of the third resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123197099.3U CN216531103U (en) | 2021-12-17 | 2021-12-17 | Single-winding multi-output switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123197099.3U CN216531103U (en) | 2021-12-17 | 2021-12-17 | Single-winding multi-output switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN216531103U true CN216531103U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123197099.3U Active CN216531103U (en) | 2021-12-17 | 2021-12-17 | Single-winding multi-output switching power supply |
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| CN (1) | CN216531103U (en) |
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2021
- 2021-12-17 CN CN202123197099.3U patent/CN216531103U/en active Active
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