CN207732616U - A kind of power supply circuit and Switching Power Supply - Google Patents
A kind of power supply circuit and Switching Power Supply Download PDFInfo
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- CN207732616U CN207732616U CN201721486292.XU CN201721486292U CN207732616U CN 207732616 U CN207732616 U CN 207732616U CN 201721486292 U CN201721486292 U CN 201721486292U CN 207732616 U CN207732616 U CN 207732616U
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Abstract
The utility model discloses a kind of power supply circuit and Switching Power Supplies, the power supply circuit includes selection circuit and linear voltage regulator, the selection circuit receives first voltage, second voltage and reference voltage, when the first voltage and second voltage are all higher than the reference voltage, the smaller value in the first voltage and second voltage is then selected to power the linear voltage regulator, the output end of the linear voltage regulator connects the first capacitance, the output feeder ear of the output end of linear voltage regulator as the power supply circuit；The first voltage is the input voltage of power stage circuit, and the second voltage is the output voltage of the power stage circuit.The Switching Power Supply includes power stage circuit and control circuit, and the control circuit includes switch controlled module, selection circuit and linear voltage regulator.The utility model can reduce linear voltage regulator for electrical power consumed, be also beneficial to reach expected output voltage.
Description
Technical field
The utility model is related to a kind of power electronics field, more particularly to a kind of power supply circuit and Switching Power Supply.
Background technology
The linear voltage regulator (LDO) of the prior art receives input voltage, and exports expected output electricity by linear regulation
Pressure, is generally used for low voltage difference occasion.As shown in Figure 1, illustrating a kind of linear voltage regulator (LDO), LDO input and output voltages are poor
When being worth larger, the loss on linear voltage regulator (LDO) is big, and LDO losses are：P=I0 (Vin-V1), wherein I0 is that LDO inputs are defeated
Go out electric current, Vin is the input voltage of LDO, and Vo is the output voltage of LDO.Application of the linear voltage regulator (LDO) in the prior art
In, it is difficult to input voltage is adjusted, and output voltage is then anticipated output voltage, therefore can have power damage unavoidably
Consume big problem.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of optional power supply circuit of input voltage and Switching Power Supply,
To reduce power consumption or make output voltage closer to desired value.
To achieve the above object, the utility model provides a kind of power supply circuit, including selection circuit and linear voltage regulator,
The selection circuit receives first voltage, second voltage and reference voltage, when the first voltage and second voltage are all higher than
When the reference voltage, then the smaller value in the first voltage and second voltage is selected to power the linear voltage regulator, institute
The output end for stating linear voltage regulator connects the first capacitance, and the output end of linear voltage regulator is powered as the output of the power supply circuit
End；The first voltage is the input voltage of power stage circuit, and the second voltage is the output voltage of the power stage circuit.
Optionally, it when one of the first voltage and second voltage are less than or the respectively less than described reference voltage, then selects
The higher value selected in the first voltage and second voltage powers to the linear voltage regulator.
Optionally, the output end of the linear voltage regulator is connect with the switch controlled module of the power stage circuit, with
To the switch controlled module for power supply.
Optionally, the power stage circuit is Buck-Boost circuits, and the Buck-Boost circuits include first switch
Pipe, second switch pipe, third switching tube, the 4th switching tube, inductance and switch controlled module, the first switch pipe and described
Second switch pipe is connected, and the common end of the first switch pipe and the second switch pipe is first switch node, and described first
Switching tube is connected to input terminal, and the second switch pipe is connected to ground, the third switching tube and the 4th switching tube series connection,
The common end of the third switching tube and the 4th switching tube is second switch node, and the third switching tube is connected to output
End, the 4th switching tube are connected to ground, the inductance connection in the first switch node and the second switch node it
Between, the output end of the switch controlled module with respectively with the first switch pipe, second switch pipe, third switching tube,
The control terminal of 4th switching tube connects.
Optionally, the reference voltage is equal to the anticipated output voltage of the linear voltage regulator.
The utility model also provides a kind of Switching Power Supply, including power stage circuit and control circuit, the control circuit packet
Switch controlled module, selection circuit and linear voltage regulator are included, the switch controlled module is opened with the power stage circuit
The control terminal connection of pipe is closed, the selection circuit is connect with the input terminal of the power stage circuit and output end respectively, and is connect
Reference voltage is received, the output end of the selection circuit is connect with the input terminal of the linear voltage regulator, the linear voltage regulator
Output end is connected with the first capacitance, and the output end of the linear voltage regulator is connect with the switch controlled module, with to institute
State switch controlled module for power supply.
Optionally, when the first voltage and second voltage are all higher than the reference voltage, then first electricity is selected
Smaller value in pressure and second voltage powers to the linear voltage regulator, the first electricity of output end connection of the linear voltage regulator
Hold, the output feeder ear of the output end of linear voltage regulator as the power supply circuit；The first voltage is power stage circuit
Input voltage, the second voltage are the output voltage of the power stage circuit.
Optionally, it when one of the first voltage and second voltage are less than or the respectively less than described reference voltage, then selects
The higher value selected in the first voltage and second voltage powers to the linear voltage regulator.
Optionally, the power stage circuit is Buck-Boost circuits, and the Buck-Boost circuits include first switch
Pipe, second switch pipe, third switching tube, the 4th switching tube, inductance and switch controlled module, the first switch pipe and described
Second switch pipe is connected, and the common end of the first switch pipe and the second switch pipe is first switch node, and described first
Switching tube is connected to input terminal, and the second switch pipe is connected to ground, the third switching tube and the 4th switching tube series connection,
The common end of the third switching tube and the 4th switching tube is second switch node, and the third switching tube is connected to output
End, the 4th switching tube are connected to ground, the inductance connection in the first switch node and the second switch node it
Between, the output end of the switch controlled module with respectively with the first switch pipe, second switch pipe, third switching tube,
The control terminal of 4th switching tube connects.
Compared with prior art, the technical solution of the utility model has the following advantages：The utility model can be applied to out
Powered-down source is used, and by being compared with reference voltage to power stage circuit input voltage, output voltage, selects input voltage, defeated
Go out appropriate voltage in voltage to power to linear voltage regulator, i.e., to reduce power consumption and meet anticipated output voltage as target, linearly
The output end of voltage-stablizer is connect with the switch controlled module of the power stage circuit, to supply the switch controlled module
Electricity.The utility model can reduce linear voltage regulator for electrical power consumed, be also beneficial to reach expected output voltage.
Description of the drawings
Fig. 1 is the structural schematic diagram of power supply circuit of the prior art based on linear voltage regulator；
Fig. 2 is the structural schematic diagram of the utility model power supply circuit；
Fig. 3 is the structural schematic diagram using the Switching Power Supply of the utility model power supply circuit；
Fig. 4 is the waveform diagram of the input voltage of linear voltage regulator, output voltage and reference voltage.
Specific implementation mode
The preferred embodiment of the utility model is described in detail below in conjunction with attached drawing, but the utility model is not merely
It is limited to these embodiments.The utility model covers any replacement made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to make the public have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Concrete details is illustrated, and description without these details can also understand that this practicality is new completely for a person skilled in the art
Type.
The utility model is more specifically described by way of example with reference to attached drawing in the following passage.It should be noted that attached drawing
Be all made of more simplified form and use non-accurate ratio, only to it is convenient, lucidly aid in illustrating the utility model
The purpose of embodiment.
As shown in Fig. 2, illustrate power supply circuit of the utility model based on linear voltage regulator, including selection circuit and linear
Voltage-stablizer LDO, the selection circuit receive first voltage V1, second voltage V2 and reference voltage Vref, when first electricity
When pressure V1 and second voltage V2 is all higher than the reference voltage Vref, then select in the first voltage V1 and second voltage V2
Smaller value powers to the linear voltage regulator LDO, and the output end of the linear voltage regulator LDO connects the first capacitance C, linear voltage stabilization
Output feeder ear of the output end of device LDO as the power supply circuit；The first voltage V1 is the input electricity of power stage circuit
Pressure, the second voltage V2 are the output voltage of the power stage circuit.A variety of topologys may be used in the power stage circuit
Structure, for example, Buck circuits, Boost circuit, Buck-Boost circuits, etc..
When the first voltage V1 and second voltage V2 are all higher than the reference voltage Vref, then first electricity is selected
Smaller value in pressure V1 and second voltage V2 powers to the linear voltage regulator LDO, and the output end of the linear voltage regulator LDO connects
Meet the first capacitance C, the output feeder ear of the output end of linear voltage regulator LDO as the power supply circuit；The first voltage V1
For the input voltage of power stage circuit, the second voltage V2 is the output voltage of the power stage circuit.
V1 and V2, Vref are compared by the selection circuit respectively, to realize the selection to V1 and V2：
Work as V1>Vref and V2>When Vref, then the minimum value in V1 and V2 is chosen as the defeated of the linear voltage regulator LDO
Enter voltage so that the pressure difference of linear voltage regulator LDO input voltages and output voltage is smaller.The input and output of linear voltage regulator LDO
Electric current is I0, then the loss on LDO is：P=I0* [min (Vin, Vout)-Vref]；
Otherwise, input voltage of the maximum value as the linear voltage regulator (LDO) in V1 and V2 is chosen, that is, works as V1>
Vref, V2<Vref selects V1 the output voltage of LDO can be made to reach Vref as the input voltage of LDO, while power damages
Consumption is smaller；Work as V1<Vref, V2>Vref selects V2 the output voltage of LDO can be made to reach as the input voltage of LDO
Vref, while power attenuation is smaller；Work as V1<Vref, V2<When Vref, select max (V1, V2) that can make as LDO input voltages
The output voltage of LDO is obtained most closer to Vref.
As shown in figure 3, the Switching Power Supply of the utility model application power supply circuit is illustrated, including power stage circuit and control
Circuit, the control circuit include switch controlled module, selection circuit and linear voltage regulator, the switch controlled module with
The control terminal of the switching tube of the power stage circuit connects, the selection circuit input terminal with the power stage circuit respectively
It is connected with output end, that is, receives the first voltage V1 and second voltage V2, and receive reference voltage Vref, the selection circuit
Output end connect with the input terminal of the linear voltage regulator LDO, the output end of the linear voltage regulator is connected with the first capacitance
C, and the output end LDO of the linear voltage regulator is connect with the switch controlled module, with to the switch controlled module
Power supply.The present embodiment is defeated due to Buck-Boost circuits using the Buck-Boost circuits of four switches as Switching Power Supply
Entering voltage and output voltage, there are various ways, therefore the advantageous effect of the utility model can be more embodied to for.
The Buck-Boost circuits include first switch pipe M1, second switch pipe M2, third switching tube M3, the 4th switch
Pipe M4, inductance L and switch controlled module, the first switch pipe M1 and second switch pipe M2 series connection, described first opens
The common end for closing the pipe M1 and second switch pipe M2 is first switch node, and the first switch pipe M1 is connected to input terminal,
The second switch pipe M2 is connected to ground, the third switching tube M3 and the 4th switching tube M4 series connection, the third switch
The common end of pipe M3 and the 4th switching tube M4 are second switch node, and the third switching tube M3 is connected to output end, institute
It stating the 4th switching tube M4 and is connected to ground, the inductance L is connected between the first switch node and the second switch node,
The output end of the switch controlled module with respectively with the first switch pipe M1, second switch pipe M2, third switching tube
The control terminal connection of M3, the 4th switching tube M4.The power supply circuit of the utility model, by the input for selecting Buck-Boost circuits
Input voltage of the more suitable voltage as LDO in voltage and output voltage, to realize reduction power consumption, and is conducive to meet
The anticipated output voltage of LDO.
As shown in figure 4, illustrating the waveform of the input voltage of linear voltage regulator, output voltage and reference voltage.LDO's is defeated
It is Vin to enter voltage, and when input voltage vin increases, output voltage Vo increases therewith；When output voltage Vo is increased to Vin
When Vref, when Vo maintains reference voltage Vref value, no longer increase with the increase of Vin.This attached drawing mainly illustrates taking for Vref
It is worth range, the reference voltage Vref is equal to the anticipated output voltage of the linear voltage regulator.But actual conditions can consider to stay
There is the problems such as surplus, therefore is not strictly limited to this numberical range.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution made by within the spirit and principle of mode
Within enclosing.
Claims (9)
1. a kind of power supply circuit, including selection circuit and linear voltage regulator, it is characterised in that：The selection circuit receives first
Voltage, second voltage and reference voltage then select institute when the first voltage and second voltage are all higher than the reference voltage
The smaller value stated in first voltage and second voltage powers to the linear voltage regulator, the output end connection of the linear voltage regulator
First capacitance, the output feeder ear of the output end of linear voltage regulator as the power supply circuit；The first voltage is power stage
The input voltage of circuit, the second voltage are the output voltage of the power stage circuit.
2. power supply circuit according to claim 1, which is characterized in that when one of the first voltage and second voltage
It is less than or the respectively less than described reference voltage, then selects the higher value in the first voltage and second voltage to the linear voltage stabilization
Device is powered.
3. power supply circuit according to claim 1 or 2, which is characterized in that the output end of the linear voltage regulator with it is described
The switch controlled module of power stage circuit connects, with to the switch controlled module for power supply.
4. power supply circuit according to claim 3, which is characterized in that the power stage circuit is Buck-Boost circuits,
The Buck-Boost circuits include first switch pipe, second switch pipe, third switching tube, the 4th switching tube, inductance and switch
Pipe control module, the first switch pipe and second switch pipe series connection, the first switch pipe and the second switch pipe
Common end be first switch node, the first switch pipe is connected to input terminal, and the second switch pipe is connected to ground, described
It is opened for second the common end of third switching tube and the 4th switching tube series connection, the third switching tube and the 4th switching tube
Artis, the third switching tube are connected to output end, and the 4th switching tube is connected to ground, and the inductance connection is in described the
Between one switching node and the second switch node, the output end of the switch controlled module with respectively with described first
The control terminal connection of switching tube, second switch pipe, third switching tube, the 4th switching tube.
5. power supply circuit according to claim 1 or 2, which is characterized in that the reference voltage is equal to the linear voltage stabilization
The anticipated output voltage of device.
6. a kind of Switching Power Supply, including power stage circuit and control circuit, which is characterized in that the control circuit includes switching tube
Control module, selection circuit and linear voltage regulator, the control of the switch controlled module and the switching tube of the power stage circuit
End connection processed, the selection circuit is connect with the input terminal of the power stage circuit and output end respectively, and is received with reference to electricity
Pressure, the output end of the selection circuit are connect with the input terminal of the linear voltage regulator, and the output end of the linear voltage regulator connects
It is connected to the first capacitance, and the output end of the linear voltage regulator is connect with the switch controlled module, with to the switching tube
Control module is powered.
7. Switching Power Supply according to claim 6, which is characterized in that when the first voltage and second voltage are all higher than institute
When stating reference voltage, then the smaller value in the first voltage and second voltage is selected to power the linear voltage regulator, it is described
The output end of linear voltage regulator connects the first capacitance, and the output end of linear voltage regulator is powered as the output of the power supply circuit
End；The first voltage is the input voltage of power stage circuit, and the second voltage is the output voltage of the power stage circuit.
8. the Switching Power Supply described according to claim 6 or 7, which is characterized in that when the first voltage and second voltage wherein
One of be less than or the respectively less than described reference voltage, then select the higher value in the first voltage and second voltage to described linear
Voltage-stablizer is powered.
9. the Switching Power Supply described according to claim 6 or 7, which is characterized in that the power stage circuit is Buck-Boost electricity
Road, the Buck-Boost circuits include first switch pipe, second switch pipe, third switching tube, the 4th switching tube, inductance and open
Close pipe control module, the first switch pipe and second switch pipe series connection, the first switch pipe and the second switch
The common end of pipe is first switch node, and the first switch pipe is connected to input terminal, and the second switch pipe is connected to ground, institute
It states third switching tube and the 4th switching tube is connected, the common end of the third switching tube and the 4th switching tube is second
Switching node, the third switching tube are connected to output end, and the 4th switching tube is connected to ground, and the inductance connection is in described
Between first switch node and the second switch node, the output end of the switch controlled module with respectively with described the
The control terminal connection of one switching tube, second switch pipe, third switching tube, the 4th switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721486292.XU CN207732616U (en) | 2017-11-09 | 2017-11-09 | A kind of power supply circuit and Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721486292.XU CN207732616U (en) | 2017-11-09 | 2017-11-09 | A kind of power supply circuit and Switching Power Supply |
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| Publication Number | Publication Date |
|---|---|
| CN207732616U true CN207732616U (en) | 2018-08-14 |
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| CN201721486292.XU Active CN207732616U (en) | 2017-11-09 | 2017-11-09 | A kind of power supply circuit and Switching Power Supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769524A (en) * | 2017-11-09 | 2018-03-06 | 杰华特微电子（杭州）有限公司 | power supply circuit and switching power supply |
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2017
- 2017-11-09 CN CN201721486292.XU patent/CN207732616U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769524A (en) * | 2017-11-09 | 2018-03-06 | 杰华特微电子（杭州）有限公司 | power supply circuit and switching power supply |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |