CN208001227U - A kind of Switching Power Supply driving power supply circuit and Switching Power Supply - Google Patents
A kind of Switching Power Supply driving power supply circuit and Switching Power Supply Download PDFInfo
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- CN208001227U CN208001227U CN201721756527.2U CN201721756527U CN208001227U CN 208001227 U CN208001227 U CN 208001227U CN 201721756527 U CN201721756527 U CN 201721756527U CN 208001227 U CN208001227 U CN 208001227U
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- power supply
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- switching
- control signal
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Abstract
The utility model discloses a kind of Switching Power Supply driving power supply circuit and Switching Power Supplies, driving power supply circuit is connected to the control terminal of switch power supply power tube, including power supply capacitor, the first end of the power supply capacitor is connect with the control terminal of the power tube, regulated voltage signal, the reception regulated voltage signal of the power supply capacitor second end are generated by first control signal and pulse signal;When the first control signal is first state, the regulated voltage signal is then characterized as pulse condition, the current potential of the power supply capacitor first end is set to effective status at this time, and as the supply voltage for driving the power tube to open;When the first control signal is the second state, the regulated voltage signal is then characterized as low level state, and the current potential of the power supply capacitor first end is set to invalid state at this time, to turn off the power tube.The utility model, which can be realized, persistently drives switch power supply power tube power supply, and power supply capacitor is small, convenient for integrated.
Description
Technical field
The utility model is related to a kind of power electronics field, more particularly to a kind of Switching Power Supply driving power supply circuit and
Switching Power Supply.
Background technology
In some switching power circuits, such as BUCK, BOOST, BUCK-BOOST circuit, need power supply circuit power supply with
Driving power pipe break-make.In the prior art, by taking BUCK circuits as an example, it is responsible for (i.e. master power switch pipe) power supply circuit such as Fig. 1
Shown, the power supply circuit includes:Diode, driving circuit and capacitance Cf, when being responsible for M1 shutdowns, auxiliary pipe M2 conductings, power supply
VCC charges to capacitance Cf;When auxiliary pipe M2 shutdowns, capacitance Cf electric discharges drive supervisor's M1 conductings by driving circuit.
When keeping the conducting state of supervisor M1, drive circuitries of the capacitance Cf persistently to supervisor M1 is needed, in capacitance
In Cf discharge processes, power supply capacity weakens, it is difficult to maintain the conducting state of supervisor, continued power ability poor.In addition, power supply
Circuit is integrated in piece, and bulky capacitor Cf is arranged outside piece, increases chip pin and manufacturing cost.
Utility model content
In view of this, the purpose of this utility model be to provide one kind can continued power, and convenient for integrated Switching Power Supply
Power supply circuit and Switching Power Supply are driven, to solve technical problem of the existing technology.
To achieve the above object, the utility model provides a kind of Switching Power Supply driving power supply circuit, is connected to switch electricity
The control terminal of source power pipe, including power supply capacitor, the first end of the power supply capacitor are connect with the control terminal of the power tube, are led to
First control signal and pulse signal are crossed to generate regulated voltage signal, the reception voltage tune of the power supply capacitor second end
Save signal;
When the first control signal is first state, the regulated voltage signal is then characterized as pulse condition, at this time will
The current potential of the power supply capacitor first end is set to effective status, and as the supply voltage for driving the power tube to open;
When the first control signal is the second state, the regulated voltage signal is then characterized as low level state, at this time
The current potential of the power supply capacitor first end is set to invalid state, to turn off the power tube.
As optional, the power supply circuit further includes first switch pipe and second switch pipe, the first switch pipe and
The control terminal of two switching tubes receives first control signal, and according to the first control signal control the first switch pipe and
The on off state of second switch pipe, the first control signal transports to the second end of the power supply capacitor through logic circuit, described
The first end of power supply capacitor is connect with the first end of the first switch pipe and second switch pipe respectively, the second switch pipe
First end is connect with the control terminal of the switch power supply power tube, and the second end of the first switch pipe receives input voltage, institute
State the second end ground connection of second switch pipe;It is single that first is connected between the first switch pipe and the first end of the power supply capacitor
To breakover element, the second one-way conduction is connected between the first end of the power supply capacitor and the first end of the second switch pipe
Element.
As optional, the logic circuit receives the first control signal and pulse signal, and output voltage tune respectively
Signal is saved, the second end of the power supply capacitor receives the regulated voltage signal.
As optional, when the first control signal is first state so that the first switch pipe conducting, described second
Switching tube turns off;When the first control signal is the second state so that the first switch pipe shutdown, the second switch pipe
Conducting.
As optional, the first control signal obtains after being negated by the inverted device of original control signal.
It is PMOS tube as optional, described first switch pipe, the second switch pipe is NMOS tube.
As optional, the driving power supply circuit further includes third switching tube, the first switch pipe control terminal and
First resistor is connected between second end, the first end of the third switching tube is connect with the control terminal of the first switch pipe,
The second end of third switching tube is grounded, and the control terminal of third switching tube receives the original control signal.
As optional, the second end of the third switching tube is connected to ground through the first current source.
As optional, the first one-way conduction element is diode or metal-oxide-semiconductor, and the second one-way conduction element is also
Diode or metal-oxide-semiconductor.
The utility model additionally provides a kind of Switching Power Supply, including any one of the above Switching Power Supply drives power supply circuit,
The Switching Power Supply driving power supply circuit is connected to the control terminal of switch power supply power tube.
Compared with prior art, the technical solution of the utility model has the following advantages:The utility model is described in opening
When switch power supply power tube, by the way that the voltage of the power supply capacitor first end is set to effectively, and the second of the power supply capacitor
End receives high-frequency impulse, to realize driving power supply, under the switch power supply power tube off state, the of the power supply capacitor
One end is set in vain.The utility model, which can be realized, persistently drives switch power supply power tube power supply, and power supply capacitor is small, just
In integrated.
Description of the drawings
Fig. 1 is the electrical block diagram that prior art Switching Power Supply drives power supply circuit;
Fig. 2 is the electrical block diagram that the utility model Switching Power Supply drives power supply circuit embodiment one;
Fig. 3 is the electrical block diagram that the utility model Switching Power Supply drives power supply circuit embodiment two.
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, the circuit structure of the utility model Switching Power Supply driving power supply circuit embodiment one is illustrated, it is described
Switching Power Supply is by taking Buck topological structures as an example.The Switching Power Supply includes power tube M00, continued flow tube D01 and inductance L, the work(
The common end SW of rate pipe M00 and continued flow tube D01 is connect with one end of inductance L, and the other end and the output voltage Co of the inductance L connect
It connects.The continued flow tube D01 is realized in figure using diode, but MOSFET may be used etc. to substitute.The Switching Power Supply is also
The topological structures such as Boost, Buck-Boost may be used.
The Switching Power Supply driving power supply circuit of the utility model is connected to the control terminal of the power tube M00, the switch
Power drives power supply circuit includes first switch pipe M01, second switch pipe M02 and power supply capacitor Cf, the first switch pipe M01
First control signal Vctrl1, Fig. 2, which are received, with the control terminal of second switch pipe M02 has been merely given as first control signal
Examples of the Vctrl1 as the control signal of first switch pipe M01, and controlled according to the first control signal Vctrl1
The on off state of the first switch pipe M01 and second switch pipe M02, the first control signal Vctrl1 are defeated through logic circuit
To the second end of the power supply capacitor Cf, the first end of the power supply capacitor Cf respectively with the first switch pipe M01 and second
The first end of switching tube M02 connects, and the first switch pipe M01 and second switch pipe M02 are by taking metal-oxide-semiconductor as an example, then first end
Can be drain electrode, second end is source electrode.The control of the first end and the switch power supply power tube M00 of the second switch pipe M02
The second end of end connection processed, the first switch pipe M01 receives input voltage VIN, the second termination of the second switch pipe M02
Ground.The first one-way conduction element D02, institute are connected between the first switch pipe M01 and the first end of the power supply capacitor Cf
It states and is connected with the second one-way conduction element D03 between the first end of power supply capacitor Cf and the first end of the second switch pipe M02.
In the present embodiment, the first one-way conduction element D02 and the second one-way conduction element D03 is all made of diode realization, but
It is that metal-oxide-semiconductor can also be used to realize.
The logic circuit receives the first control signal Vctrl1 and pulse signal ch respectively, and output voltage is adjusted
The second end of signal Vreg, the power supply capacitor Cf receive the regulated voltage signal Vreg.There are many real for the logic circuit
Existing form, in the present embodiment, the logic circuit includes nor gate U02, and two input terminals of the NOT gate U02 receive institute respectively
It is high-frequency pulse signal to state first control signal Vctrl1 and pulse signal ch, the pulse signal ch, the nor gate output
The regulated voltage signal Vreg, in order to improve the charging ability to power supply capacitor of the regulated voltage signal Vreg, therefore
Buffer Buffer is provided between NOT gate U02 and the first end of power supply capacitor Cf.
The first control signal Vctrl1 is obtained after being negated by the inverted device U01 of original control signal Vctrl0.Work as institute
When to state original control signal Vctrl0 be high level, then the first control signal Vctrl1 is low level, i.e. first state makes
The first switch pipe M01 conductings are obtained, the second switch pipe M02 shutdowns are described using the first switch pipe as PMOS tube
Second switch pipe be NMOS tube for.The nor gate U02 receives the first control signal Vctrl1 and the arteries and veins respectively
Signal ch is rushed, to which output voltage Regulate signal Vreg, the regulated voltage signal Vreg are then characterized as high-frequency impulse state, the
The first end of power supply capacitor is set to height by the conducting of one switching tube, and the regulated voltage signal Vreg of high-frequency impulse state is to power supply capacitor
Lasting charging, the current potential of the power supply capacitor first end and the supply voltage be connected as the driving switch power supply power tube.
When the original control signal Vctrl0 is low level, the first control signal Vctrl1 is high level, i.e.,
Second state so that the first switch pipe M01 shutdowns, the second switch pipe M02 conductings, equally with the first switch
Pipe is PMOS tube, and the second switch pipe is for NMOS tube.At this point, the nor gate U02 receives first control respectively
The signal Vctrl1 processed and pulse signal ch, the regulated voltage signal Vreg that the nor gate U02 is exported are characterized as low
Level state, the second switch pipe conducting drag down the current potential of the power supply capacitor first end, the regulated voltage signal
Vreg can not charge to the second end of the power supply capacitor Cf, at this time so that the power tube shutdown of the Switching Power Supply.
As shown in figure 3, illustrate the circuit structure of the utility model Switching Power Supply driving power supply circuit embodiment two, still with
For Buck topological structures.For the present embodiment what is different from the first embodiment is that in the higher occasion of input voltage VIN, i.e. input is electric
Press VIN be more than corresponding reference voltage Vref when, by reference voltage Vref be 5V for, be likely to result in first switch pipe M01 without
The case where method normal switch.Therefore, the present embodiment two increases the circuit for assisting the first switch pipe M01 switches, i.e.,
Associated drive circuitry.In the present embodiment, the control terminal of first switch pipe M01 does not receive the first control signal.
Increase third switching tube M03 on the basis of embodiment one, in the control terminal and second of the first switch pipe M01
First resistor R1 is connected between end, the first end of the third switching tube M03 and the control terminal of the first switch pipe M01 connect
It connects, the second end ground connection of third switching tube M03, the control terminal of third switching tube M03 receives the original control signal Vctrl0.
The second end of the third switching tube M03 is connected to ground through the first current source i1.It is being as the original control signal Vctrl0
When high level, the third switching tube M03 conductings are controlled, input voltage VIN generates pressure drop on the first resistor R1, to
So that the first switch pipe M01 is smoothly connected, the third switching tube M03 uses NMOS tube.
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 (10)
1. a kind of Switching Power Supply drives power supply circuit, it is connected to the control terminal of switch power supply power tube, it is characterised in that:Including supplying
Capacitance, the first end of the power supply capacitor are connect with the control terminal of the power tube, are believed by first control signal and pulse
Number generate regulated voltage signal, the second end of the power supply capacitor receives the regulated voltage signal;
When the first control signal is first state, the regulated voltage signal is then characterized as pulse condition, at this time will be described
The current potential of power supply capacitor first end is set to effective status, and as the supply voltage for driving the power tube to open;
When the first control signal is the second state, the regulated voltage signal is then characterized as low level state, at this time by institute
The current potential for stating power supply capacitor first end is set to invalid state, to turn off the power tube.
2. Switching Power Supply according to claim 1 drives power supply circuit, which is characterized in that the power supply circuit further includes the
The control terminal of one switching tube and second switch pipe, the first switch pipe receives first control signal or connection auxiliary drive electricity
The control terminal on road, second switch pipe receives first control signal, and the first control signal transports to the power supply through logic circuit
The first end of the second end of capacitance, the power supply capacitor connects with the first end of the first switch pipe and second switch pipe respectively
It connecing, the first end of the second switch pipe is connect with the control terminal of the switch power supply power tube, and the of the first switch pipe
Two ends receive input voltage, the second end ground connection of the second switch pipe;The of the first switch pipe and the power supply capacitor
Be connected with the first one-way conduction element between one end, the first end of the first end of the power supply capacitor and the second switch pipe it
Between be connected with the second one-way conduction element.
3. Switching Power Supply according to claim 2 drives power supply circuit, which is characterized in that the logic circuit receives respectively
The second end of the first control signal and pulse signal, and output voltage Regulate signal, the power supply capacitor receives the electricity
Press Regulate signal.
4. Switching Power Supply according to claim 2 or 3 drives power supply circuit, which is characterized in that the first control signal
For first state when so that first switch pipe conducting, the second switch pipe shutdown;The first control signal is second
When state so that the first switch pipe shutdown, the second switch pipe conducting.
5. Switching Power Supply according to claim 2 or 3 drives power supply circuit, which is characterized in that the logic circuit includes
Two input terminals of nor gate, the nor gate receive the first control signal and pulse signal respectively, and the nor gate is defeated
Go out the regulated voltage signal, the buffered device of regulated voltage signal accesses the second end of the power supply capacitor.
6. Switching Power Supply according to claim 2 drives power supply circuit, which is characterized in that the first control signal is by original
Begin to obtain after the control inverted device of signal negates.
7. Switching Power Supply according to claim 2 drives power supply circuit, which is characterized in that the first switch pipe is
PMOS tube, the second switch pipe are NMOS tube.
8. Switching Power Supply according to claim 6 drives power supply circuit, which is characterized in that the associated drive circuitry also wraps
Third switching tube is included, first resistor, the third switch are connected between the control terminal and second end of the first switch pipe
The first end of pipe is connect with the control terminal of the first switch pipe, the second end ground connection of third switching tube, the control of third switching tube
End processed receives the original control signal.
9. Switching Power Supply according to claim 8 drives power supply circuit, which is characterized in that the second of the third switching tube
End is connected to ground through the first current source.
10. a kind of Switching Power Supply, which is characterized in that including claim 1-9, any one Switching Power Supply drives power supply circuit, institute
State the control terminal that Switching Power Supply driving power supply circuit is connected to switch power supply power tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721756527.2U CN208001227U (en) | 2017-12-15 | 2017-12-15 | A kind of Switching Power Supply driving power supply circuit and Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721756527.2U CN208001227U (en) | 2017-12-15 | 2017-12-15 | A kind of Switching Power Supply driving power supply circuit and Switching Power Supply |
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| Publication Number | Publication Date |
|---|---|
| CN208001227U true CN208001227U (en) | 2018-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721756527.2U Withdrawn - After Issue CN208001227U (en) | 2017-12-15 | 2017-12-15 | A kind of Switching Power Supply driving power supply circuit and Switching Power Supply |
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| CN (1) | CN208001227U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947539A (en) * | 2017-12-15 | 2018-04-20 | 杰华特微电子（杭州）有限公司 | Switching Power Supply drives power supply circuit and Switching Power Supply |
| CN115389808A (en) * | 2022-10-31 | 2022-11-25 | 深圳市微源半导体股份有限公司 | Current detection circuit and buck converter |
-
2017
- 2017-12-15 CN CN201721756527.2U patent/CN208001227U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947539A (en) * | 2017-12-15 | 2018-04-20 | 杰华特微电子（杭州）有限公司 | Switching Power Supply drives power supply circuit and Switching Power Supply |
| CN107947539B (en) * | 2017-12-15 | 2024-04-19 | 杰华特微电子股份有限公司 | Switching power supply driving power supply circuit and switching power supply |
| CN115389808A (en) * | 2022-10-31 | 2022-11-25 | 深圳市微源半导体股份有限公司 | Current detection circuit and buck converter |
| CN115389808B (en) * | 2022-10-31 | 2023-02-03 | 深圳市微源半导体股份有限公司 | Current detection circuit and buck converter |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
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 Inc.,Ltd. |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181023 Effective date of abandoning: 20240419 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20181023 Effective date of abandoning: 20240419 |