CN216437064U - Low-loss direct current power supply circuit - Google Patents
Low-loss direct current power supply circuit Download PDFInfo
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- CN216437064U CN216437064U CN202123090531.9U CN202123090531U CN216437064U CN 216437064 U CN216437064 U CN 216437064U CN 202123090531 U CN202123090531 U CN 202123090531U CN 216437064 U CN216437064 U CN 216437064U
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Abstract
The utility model discloses a low-loss direct current supply circuit, it includes the transformer, set up first auxiliary winding and the second auxiliary winding on one side of the iron core of transformer, AC-DC rectifier circuit, power management circuit and linear voltage stabilizing circuit, first auxiliary winding and second auxiliary winding connect in parallel at the high-voltage input end of transformer, first auxiliary winding connects power management circuit and connects first power supply through linear voltage stabilizing circuit, second auxiliary winding connects power management circuit and connects first power supply, the low pressure output end of transformer connects second power supply; when the high-voltage output exists, the linear voltage stabilizing circuit stops working, and the voltage is supplied to the power management circuit through the second auxiliary winding. This reduces the loss of the power supply circuit.
Description
Technical Field
The present invention generally relates to a low-loss dc supply circuit.
Background
With the rapid development of social science and technology, consumer electronics products, particularly collecting chargers, are faster and faster with new iteration, and the products tend to be miniaturized, multifunctional, high in integration level and the like.
In the charger technology, the charger is required to be small in size and fast in charging time. Aiming at the condition that the charger meets different output voltage requirements, the power supply voltage is relatively wider, a linear voltage stabilization mode is used, the power supply loss is extremely large when high voltage is output, and the device is easy to damage to cause power supply failure.
SUMMERY OF THE UTILITY MODEL
In view of the above conventional situation, an object of the present invention is to provide a low-loss dc power supply circuit capable of reducing loss.
Therefore, the utility model provides a low-loss direct current supply circuit, it includes the transformer, set up first auxiliary winding and second auxiliary winding, AC-DC rectifier circuit, power management circuit and the linear voltage stabilizing circuit in iron core one side of the transformer, the high-voltage input end of transformer connects respectively AC-DC rectifier circuit and power management circuit, first auxiliary winding and the second auxiliary winding connect in parallel at the high-voltage input end of transformer, first auxiliary winding connects power management circuit and connects first power supply through the linear voltage stabilizing circuit, the second auxiliary winding connects power management circuit and connects first power supply, the low-voltage output end of transformer connects second power supply; the winding turns of the first auxiliary winding are larger than those of the second auxiliary winding, when low-voltage output is available, the first auxiliary winding and the second auxiliary winding work simultaneously and provide stable voltage for the power management circuit through the linear voltage stabilizing circuit, when high-voltage output is available, the linear voltage stabilizing circuit stops working, and voltage is provided for the power management circuit through the second auxiliary winding.
In the utility model, when low voltage is output, the first auxiliary winding and the second auxiliary winding can work simultaneously and provide a stable voltage to the power management circuit through the linear voltage stabilizing circuit, and the voltage difference between the two ends of the linear voltage stabilizing circuit is relatively small, and the loss is also small; when high voltage is output, the linear voltage stabilizing circuit stops working, at the moment, voltage can be provided for the power management circuit through the second auxiliary winding, and loss is correspondingly reduced.
In addition, in the low-loss dc power supply circuit according to the present invention, optionally, the linear voltage stabilizing circuit includes a third rectifier diode, a fourth voltage stabilizing diode, a third resistor, and a second triode, wherein one end of the third resistor is connected to the collector of the second triode and the first pin of the first auxiliary winding, and the other end of the third resistor is connected to the base of the second triode; an emitting electrode of the second triode is connected with the anode of the third rectifying diode, and the cathode of the third rectifying diode is connected with the power management circuit; the negative electrode of the fourth voltage stabilizing diode is connected with the base electrode of the second triode, and the positive electrode of the fourth voltage stabilizing diode is grounded. Therefore, the fourth voltage stabilizing diode is reversely connected to the linear voltage stabilizing circuit, so that the linear voltage stabilizing circuit can be conveniently prevented from being conducted when high voltage is output.
In addition, in the low-loss dc power supply circuit of the present invention, optionally, the power management circuit includes a power management chip. Therefore, the voltage can be conveniently processed and output.
Additionally, in the low-loss dc power supply circuit of the present invention, optionally, the first auxiliary winding and the linear voltage stabilizing circuit are connected to a second rectifying pole tube, the anode of the second rectifying pole tube is connected to the first auxiliary winding, and the cathode of the second rectifying pole tube is connected to one end of the third resistor. Therefore, the current output by the first auxiliary winding can be conveniently rectified.
Additionally, in the low-loss dc power supply circuit of the present invention, optionally, the dc power supply circuit further includes a current output circuit, and the low-voltage output terminal of the transformer is connected to the current output circuit. Therefore, the current output by the low-voltage output end of the transformer can be conveniently processed and output.
In addition, in the low-loss dc power supply circuit of the present invention, optionally, the current output circuit includes a transformer driving chip. Therefore, the driving transformer can work conveniently.
In the utility model, when low voltage is output, the first auxiliary winding and the second auxiliary winding can work simultaneously and provide a stable voltage to the power management circuit through the linear voltage stabilizing circuit, and the voltage difference between the two ends of the linear voltage stabilizing circuit is relatively small, and the loss is also small; when high voltage is output, the linear voltage stabilizing circuit stops working, at the moment, voltage can be provided for the power management circuit through the second auxiliary winding, and loss is correspondingly reduced.
Drawings
Embodiments of the invention will now be explained in further detail by way of example only with reference to the accompanying drawings, in which:
fig. 1 is a functional schematic diagram illustrating a low-loss dc power supply circuit according to the present invention.
Fig. 2 is a schematic circuit diagram showing a low-loss dc power supply circuit according to the present invention.
Description of the symbols:
the power supply comprises a 10 … transformer, a 20 … linear voltage stabilizing circuit, a 30 … power supply management circuit, a 40 … AC-DC rectifying circuit, a 50 … current output circuit, a T1B … first auxiliary winding and a T1C … second auxiliary winding.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.
Fig. 1 is a functional schematic diagram illustrating a low-loss dc power supply circuit according to the present invention.
Referring to fig. 1, in the present embodiment, a low-loss DC power supply circuit 1 (hereinafter, referred to as a circuit 1) may include a transformer 10, a first auxiliary winding T1B and a second auxiliary winding T1C provided on a core side of the transformer 10, an AC-DC rectifier circuit 40, a power management circuit 30, and a linear voltage regulator circuit 20. The high voltage input end of the transformer 10 can be connected with the AC-DC rectifying circuit 40 and the power management circuit 30 respectively, the first auxiliary winding T1B and the second auxiliary winding T1C can be connected in parallel at the high voltage input end of the transformer 10, the first auxiliary winding T1B can be connected with the power management circuit 30 and connected with the first power supply VCC through the linear voltage stabilizing circuit 20, the second auxiliary winding T1C can be directly connected with the power management circuit 30 and connected with the first power supply VCC, and the low voltage output end of the transformer 10 can be connected with the second power supply Vo. The number of winding turns of the first auxiliary winding T1B may be greater than that of the second auxiliary winding T1C, when there is low voltage output, the first auxiliary winding T1B and the second auxiliary winding T1C can work simultaneously and provide a stable voltage to the power management circuit 30 through the linear regulator circuit 20, when there is high voltage output, the linear regulator circuit 20 can stop working, and at this time, the voltage can be provided to the power management circuit 50 through the second auxiliary winding T1C.
In the present invention, when there is a low voltage output, the first auxiliary winding T1B and the second auxiliary winding T1C can work simultaneously and provide a stable voltage to the power management circuit 30 through the linear voltage stabilizing circuit 20, and at this time, the voltage difference between the two ends of the linear voltage stabilizing circuit 20 is relatively small, and the loss is also small; when there is a high voltage output, the linear voltage stabilizing circuit 20 stops working, and at this time, the power management circuit 30 can be supplied with voltage through the second auxiliary winding T1C, and the loss is reduced accordingly, so that the power supply is switched between high voltage and low voltage by using the first auxiliary winding T1B and the second auxiliary winding T1C, and the loss can be reduced, and the reliability of the circuit 1 (low-loss dc power supply circuit 1) can be improved.
Fig. 2 is a schematic circuit diagram showing a low-loss dc power supply circuit according to the present invention.
Specifically, referring to fig. 2, in the present embodiment, the linear voltage regulating circuit 20 may include a third rectifying diode D3, a fourth zener diode D4, a third resistor R3, and a second transistor Q2. One end of the third resistor R3 may be connected to the collector of the second transistor Q2 and the first pin of the first auxiliary winding T1B, respectively, and the other end of the third resistor R3 may be connected to the base of the second transistor Q2; the emitter of the second triode Q2 may be connected to the anode of the third rectifying diode D3, and the cathode of the third rectifying diode D3 may be connected to the power management circuit 30; the cathode of the fourth zener diode D4 may be connected to the base of the second transistor Q2, and the anode of the fourth zener diode D4 may be grounded. Therefore, the fourth zener diode D4 is connected in reverse to the linear voltage regulator circuit, so that the linear voltage regulator circuit 20 can be prevented from being turned on when a high voltage is output.
In some examples, the second pin of the first auxiliary winding T1B may be connected to the first pin of the second auxiliary winding T1C, and the second pin of the second auxiliary winding T1C may be grounded.
In this embodiment, the output end of the AC-DC rectifying circuit 40 may be connected to the live line L and neutral line N inputs, respectively.
In this embodiment, the Power Management circuit may include a Power Management chip U1 (IC). The power supply terminal of the power management chip U1 may be connected to a power supply VCC. Therefore, the voltage of the circuit 1 can be conveniently processed and output.
In this embodiment, a second rectifying pole diode D2 may be connected between the first auxiliary winding T1B and the linear voltage regulator circuit 20, the anode of the second rectifying pole diode D2 may be connected to the first auxiliary winding T1B, and the cathode of the second rectifying pole diode D2 may be connected to one end of the third resistor R3. This facilitates the rectification and output of the current output from the first auxiliary winding T1B.
In this embodiment, the circuit 1 further includes a current output circuit 50, and the low voltage output terminal of the transformer may be connected to the current output circuit 50. Therefore, the current output by the low-voltage output end of the transformer 10 can be conveniently processed and output.
In this embodiment, the current output circuit 50 may include a transformer driver chip U3. This facilitates the operation of the driving transformer 10.
In the present embodiment, the transformer 10 may include a first winding T1A and a second winding T1D. As shown in fig. 2, the first winding T1A, the first auxiliary winding T1B, and the second auxiliary winding T1C may be uniformly disposed on the left side of the core, and the second winding T1D may be disposed on the right side of the core. The first winding T1A, the second winding T1D, the first auxiliary winding T1B and the second auxiliary winding T1C may constitute the complete transformer 10 in the circuit 1.
A first pin end of the first winding T1A can be connected with the AC-DC rectifying circuit 40, and a second pin end of the first winding T1A can be connected with the power management circuit 30; the third pin end of the second winding T1D may be connected to the power supply Vo, and the fourth pin end of the second winding T1D may be connected to the transformer driving chip U3.
Description of the working principle: the first power supply mode (low-voltage power supply) is that the first auxiliary winding T1B and the second auxiliary winding T1C are rectified by the D2 and then output by the linear voltage stabilizing unit 20, and at this time, the power supply voltage can be set by the fourth voltage stabilizing diode D4 and the third resistor R3 to be a fixed voltage minus the voltage at the third diode D3; the second supply (high voltage supply) is (T1C turns/T1D turns) × Vo.
As an exemplary illustration: when the output high voltage is 20V, assuming that the supply current of the first power supply is 1mA, the voltage stabilizing value of the fourth voltage stabilizing diode D4 is 12V, the number of coil turns of the first auxiliary winding T1B is 12 turns, the number of coil turns of the second auxiliary winding T1C is 3 turns, and the number of coil turns of the second winding T1D is 4 turns; the collector terminal voltage VC of the second transistor Q2 is ((T1B turns + T1C turns)/T1D turns) × Vo is 75V, the emitter terminal voltage VE of the second transistor Q2 is 12V, and the loss power is V × I is (75-12) × 0.001 is 0.063W. Thus, it can be seen that the power loss through the linear regulator unit 20 is low when it is a high voltage output.
In the present invention, when there is a low voltage output, the first auxiliary winding T1B and the second auxiliary winding T1C can work simultaneously and provide a stable voltage to the power management circuit 30 through the linear voltage stabilizing circuit 20, and at this time, the voltage difference between the two ends of the linear voltage stabilizing circuit 20 is relatively small, and the loss is also small; when there is a high voltage output, the linear voltage stabilizing circuit 20 stops working, and at this time, the power management circuit 30 can be supplied with voltage through the second auxiliary winding T1C, and the loss is correspondingly reduced, so that the power is switched between high voltage and low voltage by using the first auxiliary winding T1B and the second auxiliary winding T1C, and the loss can be reduced, and the reliability of the low-loss dc power supply circuit 1 can be improved.
While the present invention has been described in detail in connection with the drawings and the examples, it is to be understood that the above description is not intended to limit the present invention in any way. The present invention may be modified and varied as necessary by those skilled in the art without departing from the true spirit and scope of the invention, and all such modifications and variations are intended to be included within the scope of the invention.
Claims (6)
1. A low-loss direct current power supply circuit is characterized by comprising a transformer, a first auxiliary winding and a second auxiliary winding which are arranged on one side of an iron core of the transformer, an AC-DC rectifying circuit, a power management circuit and a linear voltage stabilizing circuit, wherein the high-voltage input end of the transformer is respectively connected with the AC-DC rectifying circuit and the power management circuit; the winding turns of the first auxiliary winding are larger than those of the second auxiliary winding, when low-voltage output is available, the first auxiliary winding and the second auxiliary winding work simultaneously and provide stable voltage for the power management circuit through the linear voltage stabilizing circuit, when high-voltage output is available, the linear voltage stabilizing circuit stops working, and voltage is provided for the power management circuit through the second auxiliary winding.
2. The low-loss DC supply circuit according to claim 1,
the linear voltage stabilizing circuit comprises a third rectifier diode, a fourth voltage stabilizing diode, a third resistor and a second triode, wherein one end of the third resistor is respectively connected with a collector of the second triode and a first pin of the first auxiliary winding, and the other end of the third resistor is connected with a base of the second triode; an emitting electrode of the second triode is connected with the anode of the third rectifying diode, and the cathode of the third rectifying diode is connected with the power management circuit; the negative electrode of the fourth voltage stabilizing diode is connected with the base electrode of the second triode, and the positive electrode of the fourth voltage stabilizing diode is grounded.
3. The low-loss DC supply circuit according to claim 1,
the power management circuit comprises a power management chip.
4. The low-loss DC supply circuit according to claim 2,
and a second rectifying pole tube is connected between the first auxiliary winding and the linear voltage stabilizing circuit, the anode of the second rectifying pole tube is connected with the first auxiliary winding, and the cathode of the second rectifying pole tube is connected with one end of the third resistor.
5. The low-loss DC supply circuit according to claim 1,
the low-voltage output end of the transformer is connected with the current output circuit.
6. The low-loss DC supply circuit according to claim 5,
the current output circuit comprises a transformer driving chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123090531.9U CN216437064U (en) | 2021-12-09 | 2021-12-09 | Low-loss direct current power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123090531.9U CN216437064U (en) | 2021-12-09 | 2021-12-09 | Low-loss direct current power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216437064U true CN216437064U (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123090531.9U Active CN216437064U (en) | 2021-12-09 | 2021-12-09 | Low-loss direct current power supply circuit |
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| Country | Link |
|---|---|
| CN (1) | CN216437064U (en) |
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2021
- 2021-12-09 CN CN202123090531.9U patent/CN216437064U/en active Active
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| CB03 | Change of inventor or designer information |
Inventor after: Yu Leqiang Inventor after: Xiong Yuming Inventor after: Jiang Chunyuan Inventor after: Huang Yusong Inventor before: Yu Leqiang Inventor before: Xiong Yuming Inventor before: Huang Yusong |