CN207234665U - A kind of power supply circuit and Switching Power Supply of pulse width modulation chip - Google Patents
A kind of power supply circuit and Switching Power Supply of pulse width modulation chip Download PDFInfo
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- CN207234665U CN207234665U CN201721104184.1U CN201721104184U CN207234665U CN 207234665 U CN207234665 U CN 207234665U CN 201721104184 U CN201721104184 U CN 201721104184U CN 207234665 U CN207234665 U CN 207234665U
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Abstract
The utility model discloses a kind of power supply circuit and Switching Power Supply of pulse width modulation chip, wherein, power supply circuit passes through transformer output AC voltage to the first starting module and the second starting module；When pulse width modulation chip works normally, pulse width modulation chip exports first control signal to the first starting module so that the first starting module is stopped, and alternating voltage is converted to supply voltage and exported to pulse width modulation chip by the second starting module；When pulse width modulation chip is not actuated, pulse width modulation chip exports second control signal to the first starting module so that the first starting module works, and alternating voltage is converted to supply voltage and exported to pulse width modulation chip with starting impulse width modulated chip by the first starting module.Avoid at low temperature can not normal starting impulse width modulated chip situation, ensure that no matter pulse width modulation chip can normally start in any environment, performance is stablized.
Description
Technical field
It the utility model is related to power technique fields, more particularly to a kind of power supply circuit of pulse width modulation chip and open
Powered-down source.
Background technology
It is required for a power supply circuit to carry out the pulse width modulation chip to control power supply in Switching Power Supplies all at present
It is powered, existing product is primary side increase by the one winding i.e. auxiliary winding in transformer, and core is given to by rectification circuit
The feeder ear power supply of piece pulse width modulation chip, is then then turned on the circuit of whole Switching Power Supply.But according to Market Feedback, warp
Often occur that low temperature does not open the phenomenon of machine, cause customer complaint or even return goods.It the analysis found that, the reason is that due to power supply electricity
Storage capacitor (electrolytic capacitor) in the road capacitance in low temperature is lower, and causes the voltage at its both ends cannot reach pulse width modulation
The startup voltage of chip, so as to cause Switching Power Supply not start.Moreover, it is big electrolytic capacitor can not to be changed into capacity, that
It is slow that sample can cause Switching Power Supply to start in normal work.
To sum up, conventionally, as the electrolytic capacitor characteristic that capacity diminishes in low temperature so that Switching Power Supply is low
It can not start when warm, cause properties of product unstable.
Utility model content
The utility model embodiment provides a kind of power supply circuit and Switching Power Supply of pulse width modulation chip, it is intended to solves
Certainly in the prior art due to the electrolytic capacitor characteristic that capacity diminishes in low temperature so that Switching Power Supply can not start in low temperature,
The problem of causing properties of product unstable.
The utility model embodiment first aspect provides a kind of power supply circuit of pulse width modulation chip, including first
Starting module and the second starting module.
The input terminal of first starting module and the input terminal of the second starting module are connected to transformer altogether, the first starting module
Output terminal and the output terminal of the second starting module are connected to the feeder ear of pulse width modulation chip altogether, the first starting module it is controlled
End is connected with the output terminal of pulse width modulation chip.
Transformer output AC voltage is to the first starting module and the second starting module；When pulse width modulation chip is normal
During work, pulse width modulation chip exports first control signal to the first starting module so that the first starting module stops work
Make, alternating voltage is converted to supply voltage and exported to pulse width modulation chip by the second starting module；Work as pulse width modulation
When chip is not actuated, pulse width modulation chip exports second control signal to the first starting module so that the first starting module work
Make, alternating voltage is converted to supply voltage and exported to pulse width modulation chip with starting impulse width tune by the first starting module
Coremaking piece.
In one embodiment, the first starting module includes the first rectification filtering unit and switch control unit.
Auxiliary of the input terminal of first rectification filtering unit as the input termination transformer primary of the first starting module
The Same Name of Ends of winding, the output terminal of the first rectification filtering unit and the input terminal of switch control unit connect, switch control unit
Controlled end be the first starting module controlled end, the output terminal of switch control unit is the output terminal of the first starting module.
First rectification filtering unit is depressured alternating voltage and rectification handles to obtain DC voltage, switch control unit
Conducting is realized under the control of first control signal and second control signal and is disconnected.
In one embodiment, the first rectification filtering unit include capacitance C7, capacitance C8, resistance R34, the 7th diode,
9th diode and the 8th voltage-stabiliser tube.
The first end of capacitance C7 and the first end of resistance R34 connect the input terminal to form the first rectification filtering unit, capacitance altogether
The second end of C7 and the anode of the second end of resistance R34 and the 7th diode connect altogether, and the cathode of the 7th diode is with capacitance C8's
The cathode of first end, the cathode of the 9th diode and the 8th voltage-stabiliser tube connects the output terminal to form the first rectification filtering unit altogether, electricity
Hold the second end of C8 and the anode of the anode of the 9th diode and the 8th voltage-stabiliser tube is connected to ground altogether.
In one embodiment, switch control unit includes resistance R31, resistance R32, resistance R33, second switch pipe and the
Three switching tubes.
The input terminal of the transmitting extremely switch control unit of 3rd switching tube, the collector connecting resistance R31 of the 3rd switching tube
First end, the base stage of the 3rd switching tube and the emitter of the first end of resistance R32 and second switch pipe connect altogether, second switch pipe
Base stage connecting resistance R33 first end, the grounded collector of second switch pipe, the second end of resistance R31 and the second of resistance R32
End connects the output terminal to form switch control unit altogether, and the second end of resistance R33 is the controlled end of switch control unit.
In one embodiment, the second starting module includes the second rectification filtering unit and energy-storage units.
The first input end of second rectification filtering unit is as the input termination transformer primary of the second starting module
The Same Name of Ends of auxiliary winding, the output terminal of the second rectification filtering unit and the first end of energy-storage units connect to form the second startup mould altogether
The output terminal of block, the different name end of the auxiliary winding of transformer primary and the second input terminal of the second rectification filtering unit, energy storage
The second end of unit and the ground terminal of pulse width modulation chip are connected to ground altogether.
In one embodiment, the second rectification filtering unit includes the tenth pole pipe, resistance R35 and capacitance C12.
The anode of tenth pole pipe be the second rectification filtering unit first input end, the cathode connecting resistance R35 of the tenth pole pipe
First end, the second end of resistance R35 and the first end of capacitance C12 connect the output terminal to form the second rectification filtering unit altogether, electricity
The second end for holding C12 is the second input terminal of the second rectification filtering unit.
In one embodiment, energy-storage units include electrolytic capacitor C11；The first end and second end of electrolytic capacitor C11 point
Not Wei energy-storage units first end and second end.
The utility model embodiment second aspect provides a kind of Switching Power Supply, including power supply circuit as described above, also
Including the pulse width modulation chip being connected with power supply circuit and the ac-dc converter circuit being connected with pulse width modulation chip.
In one embodiment, ac-dc converter circuit include voltage transformation module, current feedback module, switch module and
Voltage feedback module.
Voltage transformation module is connected with current feedback module, switch module and voltage feedback module respectively, current feedback mould
Block, switch module and voltage feedback module are connected with pulse width modulation chip respectively.
Voltage transformation module incoming transport electricity exports direct current, voltage transformation module output feedback current warp after treatment
Overcurrent feedback module provides starting current to pulse width modulation chip, and voltage transformation module exports feedback voltage through overvoltage
Feedback module to pulse width modulation chip, believe by the pulse that pulse width modulation chip exports different duty according to feedback voltage
Number to switch module, switch module controls the direct current of voltage transformation module output voltage stabilization according to pulse signal.
In one embodiment, voltage transformation module includes transformer.
Transformer includes the armature winding and auxiliary winding and the secondary coil for being located at primary side for being located at primary side.
Existing beneficial effect is the utility model embodiment compared with prior art：Pass through transformer output AC voltage
To the first starting module and the second starting module；When pulse width modulation chip works normally, pulse width modulation chip is defeated
Go out first control signal to the first starting module so that the first starting module is stopped, the second starting module turns alternating voltage
Supply voltage is changed to export to pulse width modulation chip；When pulse width modulation chip is not actuated, pulse width modulation core
Piece exports second control signal to the first starting module so that the first starting module works, and the first starting module turns alternating voltage
Supply voltage is changed to export to pulse width modulation chip with starting impulse width modulated chip.Avoiding at low temperature can not be just
The situation of normal starting impulse width modulated chip, ensure that no matter pulse width modulation chip in any environment can be normal
Start, performance is stablized.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the utility model,
For those of ordinary skill in the art, without having to pay creative labor, can also be obtained according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the modular structure of the power supply circuit for the pulse width modulation chip that one embodiment of the utility model provides
Schematic diagram；
Fig. 2 is the circuit structure of the power supply circuit for the pulse width modulation chip that one embodiment of the utility model provides
Schematic diagram；
Fig. 3 is the modular structure schematic diagram for the Switching Power Supply that one embodiment of the utility model provides.
Embodiment
In order to make those skilled in the art more fully understand this programme scheme, below in conjunction with this programme embodiment
Attached drawing, is explicitly described the technical solution in this programme embodiment, it is clear that described embodiment is this programme one
The embodiment divided, instead of all the embodiments.Based on the embodiment in this programme, those of ordinary skill in the art are not doing
Go out all other embodiments obtained under the premise of creative work, should all belong to the scope of this programme protection.
Term " comprising " and their any deformations in the specification and claims of this programme and above-mentioned attached drawing, meaning
Figure is to cover non-exclusive include.In addition, term " first " and " second " etc. are to be used to distinguish different objects, not for retouching
State particular order.
It is described in detail below in conjunction with realization of the specific attached drawing to the utility model：
Embodiment 1：
Fig. 1 shows a kind of power supply circuit 100 for pulse width modulation chip that the utility model embodiment 1 is provided
Structure, for convenience of description, illustrate only with 1 relevant part of the utility model embodiment, details are as follows：
As shown in Figure 1, a kind of power supply circuit 100 for pulse width modulation chip that the utility model embodiment 1 is provided,
Including the first starting module 110 and the second starting module 120.
The input terminal of first starting module 110 and the input terminal of the second starting module 120 are connected to transformer T1 altogether, and first opens
The output terminal of dynamic model block 110 and the output terminal of the second starting module 120 are connected to the feeder ear of pulse width modulation chip U1 altogether
VCC, the controlled end of the first starting module 110 are connected with the output terminal OUT of pulse width modulation chip U1,
Transformer T1 output AC voltages are to the first starting module 110 and the second starting module 120；Work as pulse width modulation
When chip U1 is worked normally, pulse width modulation chip U1 exports first control signal to the first starting module 110 so that first
Starting module 110 is stopped, and alternating voltage is converted to supply voltage and exported to pulse width modulation by the second starting module 120
Chip U1；When pulse width modulation chip U1 is not actuated, pulse width modulation chip U1 exports second control signal to first
For starting module 110 so that the first starting module 110 works, it is defeated that alternating voltage is converted to supply voltage by the first starting module 110
Go out to pulse width modulation chip U1 with starting impulse width modulated chip U1.
The utility model embodiment is suitable for the pulse width modulation chip U1 of disposable type, passes through pulse width modulation core
Piece U1 exports different control signals under different working condition, to realize in the first starting module 110 and the second starting module
Conversion between 120, at low temperature can not normal starting impulse width modulated chip U1 so as to avoid the second starting module 120
Situation, ensure that no matter pulse width modulation chip U1 can normally start in any environment.
As shown in Fig. 2, in one embodiment of the utility model, it is whole that the first starting module 110 in Fig. 1 includes first
Flow filter unit 111 and switch control unit 112.
The input terminal of first rectification filtering unit 111 is primary as the input termination transformer T1 of the first starting module 110
The Same Name of Ends of the auxiliary winding of side, the output terminal of the first rectification filtering unit 111 connect with the input terminal of switch control unit 112
Connect, the controlled end of switch control unit 112 is the controlled end of the first starting module 110, and the output terminal of switch control unit 112 is
The output terminal of first starting module 110.
First rectification filtering unit 111 is depressured alternating voltage and rectification handles to obtain DC voltage, switch control
Unit 112 is realized conducting and is disconnected under the control of first control signal and second control signal.
As shown in Fig. 2, in one embodiment of the utility model, the first rectification filtering unit 111 includes capacitance C7, electricity
Hold C8, resistance R34, the 7th diode D7, the 9th diode D9 and the 8th voltage-stabiliser tube D8.
The first end of capacitance C7 and the first end of resistance R34 connect the input terminal to form the first rectification filtering unit 111 altogether, electricity
The second end and the second end of resistance R34 and the anode of the 7th diode D7 of appearance C7 connects altogether, cathode and the electricity of the 7th diode D7
First end, the cathode of the 9th diode D9 and the cathode of the 8th voltage-stabiliser tube D8 for holding C8 connect to form the first rectification filtering unit altogether
111 output terminal, the second end of capacitance C8 are connected to ground altogether with the anode of the 9th diode D9 and the anode of the 8th voltage-stabiliser tube D8.
As shown in Fig. 2, in one embodiment of the utility model, switch control unit 112 includes resistance R31, resistance
R32, resistance R33, second switch pipe Q2 and the 3rd switching tube Q3.
The input terminal of the transmitting extremely switch control unit 112 of 3rd switching tube Q3, the collector of the 3rd switching tube Q3 connect
The first end of resistance R31, the base stage of the 3rd switching tube Q3 and the emitter of the first end of resistance R32 and second switch pipe Q2 are total to
Connect, the first end of the base stage connecting resistance R33 of second switch pipe Q2, the grounded collector of second switch pipe Q2, the second of resistance R31
The second end of end and resistance R32 connect the output terminal to form switch control unit 112 altogether, and the second end of resistance R33 controls for switch
The controlled end of unit 112.
As shown in Fig. 2, in one embodiment of the utility model, it is whole that the second starting module 120 in Fig. 1 includes second
Flow filter unit 121 and energy-storage units 122.
Input termination transformer T1 of the first input end of second rectification filtering unit 121 as the second starting module 120
The Same Name of Ends of the auxiliary winding of primary side, the output terminal of the second rectification filtering unit 121 connect altogether with the first end of energy-storage units 122
Form the output terminal of the second starting module 120, the different name end of the auxiliary winding of transformer T1 primary sides and the second rectifying and wave-filtering list
The ground terminal GND of first 121 the second input terminal, the second end of energy-storage units 122 and pulse width modulation chip U1 is connected to ground altogether.
As shown in Fig. 2, in one embodiment of the utility model, the second rectification filtering unit 121 includes the tenth pole pipe
D10, resistance R35 and capacitance C12.
The anode of tenth pole pipe D10 be the second rectification filtering unit 121 first input end, the cathode of the tenth pole pipe D10
The first end of connecting resistance R35, the second end of resistance R35 connect to form the second rectification filtering unit 121 altogether with the first end of capacitance C12
Output terminal, the second end of capacitance C12 is the second input terminal of the second rectification filtering unit 121.
As shown in Fig. 2, in one embodiment of the utility model, energy-storage units 122 include electrolytic capacitor C11；Electrolysis
The first end and second end of capacitance C11 is respectively the first end and second end of energy-storage units 122.
As shown in Fig. 2, in one embodiment of the utility model, the overheat protector end PT of pulse width modulation chip U1
The first end of connecting resistance R36, the feedback end FB of pulse width modulation chip U1 connect the first end of capacitance C9, pulse width modulation core
The chip select terminal CS of piece U1 connects the first end of capacitance C10, the second end of resistance R36, the second end of capacitance C9 and the second of capacitance C10
End is connected to ground altogether.
In one embodiment, the model PF6202A of pulse width modulation chip U1.Pulse width modulation chip U1's
Overheat protector end PT, feedback end FB, chip select terminal CS, ground terminal GND, output terminal OUT and feeder ear VCC be respectively the first pin,
Second pin, the 3rd pin, the 4th pin, the 5th pin and the 6th pin.
In the utility model embodiment, the big capacitance of electrolytic capacitor C11 selection capacity.
When pulse width modulation chip U1 is worked normally, the auxiliary winding of transformer T1 is given by the tenth diode D10
The feeder ear VCC power supplies of pulse width modulation chip U1, supply voltage are equal to the tank voltage at electrolytic capacitor C11 both ends.At this time,
The output terminal OUT output high level of pulse width modulation chip U1, by resistance R33 to second switch pipe Q2, second switch pipe
Q2 and the 3rd switching tube Q3 cut-offs, the first starting module 110 is off-state.
When there are abnormal conditions, for example, at low ambient temperatures.When pulse width modulation chip U1 does not work, pulse
The output terminal OUT output low levels of width modulated chip U1, by resistance R33 to second switch pipe Q2, second switch pipe Q2 and
3rd switching tube Q3 is turned on, and the first starting module 110 is conducting state, and the auxiliary winding of transformer T1 passes through capacitance C7 and resistance
R34 decompression after pass through the 7th diode D7 rectifications again, then after the 8th voltage-stabiliser tube D8 voltage stabilizings by the 3rd switching tube Q3 to arteries and veins
The feeder ear VCC power supplies of width modulated chip U1 are rushed, pulse width modulation chip U1 starts.
After pulse width modulation chip U1 starts, the output terminal OUT output high level of pulse width modulation chip U1, second
Switching tube Q2 and the 3rd switching tube Q3 cut-offs, the first starting module 110 are stopped, and at this time, electrolytic capacitor C11 is filled with
Electricity, the second starting module 120 can normally power for pulse width modulation chip U1.
Embodiment 2：
Fig. 3 shows a kind of structure for Switching Power Supply that the utility model embodiment 2 is provided, for convenience of description, only
Show with 2 relevant part of the utility model embodiment, details are as follows：
As shown in figure 3, a kind of Switching Power Supply that the utility model embodiment 2 is provided, including as described in example 1 above
Power supply circuit 100, further include the pulse width modulation chip U1 that is connected with power supply circuit 100 and with pulse width modulation chip U1
The ac-dc converter circuit 200 of connection.
As shown in figure 3, in one embodiment of the utility model, ac-dc converter circuit 200 includes voltage conversion mould
Block 210, current feedback module 220, switch module 230 and voltage feedback module 240.
Voltage transformation module 210 connects with current feedback module 220, switch module 230 and voltage feedback module 240 respectively
Connect, current feedback module 220, switch module 230 and voltage feedback module 240 are connected with pulse width modulation chip U1 respectively.
210 incoming transport electricity of voltage transformation module exports direct current, the output feedback of voltage transformation module 210 after treatment
Electric current provides starting current by current feedback module 220 to pulse width modulation chip U1, and voltage transformation module 210 exports instead
Feedthrough voltage is by voltage feedback module 240 to pulse width modulation chip U1, and pulse width modulation chip U1 is according to feedback voltage
Pulse signal to switch module 230, the switch module 230 for exporting different duty controls voltage transformation module according to pulse signal
The direct current of 210 output voltage stabilizations.
In one embodiment, the current terminal HV of the output termination pulse width modulation chip U1 of current feedback module 220.
The feedback end FB of the output termination pulse width modulation chip U1 of voltage feedback module 240.The input termination arteries and veins of switch module 230
Rush the output terminal OUT of width modulated chip U1.
In one embodiment, the model PF6202A of pulse width modulation chip U1.Pulse width modulation chip U1's
Current terminal HV and feedback end FB is respectively the 8th pin and second pin.
In one embodiment, voltage transformation module includes transformer T1.
Transformer T1 includes the armature winding and auxiliary winding and the secondary coil for being located at primary side for being located at primary side.
The utility model embodiment can be applied to the Switching Power Supply of all topological structures, such as reverse exciting switching voltage regulator, normal shock
Switching Power Supply, LLC Switching Power Supplies, recommend Switching Power Supply etc..
It should be noted that the identical port of label or pin are to connect in the utility model specification and drawings.
The above, above example is only to illustrate the technical solution of the utility model, rather than its limitations；Although ginseng
The utility model is described in detail according to previous embodiment, it will be understood by those of ordinary skill in the art that：It is still
It can modify to the technical solution described in foregoing embodiments, or which part technical characteristic is equally replaced
Change；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the utility model technical solution
Spirit and scope.
Claims (10)
1. a kind of power supply circuit of pulse width modulation chip, it is characterised in that start mould including the first starting module and second
Block；
The input terminal of first starting module and the input terminal of second starting module are connected to transformer altogether, and described first opens
The output terminal of the output terminal of dynamic model block and second starting module is connected to the feeder ear of pulse width modulation chip altogether, and described the
The controlled end of one starting module is connected with the output terminal of the pulse width modulation chip；
The transformer output AC voltage is to first starting module and second starting module；When the pulse width
When modulating chip normal work, the pulse width modulation chip export first control signal to first starting module so that
First starting module is stopped, and the alternating voltage is converted to supply voltage and exported to institute by second starting module
State pulse width modulation chip；When the pulse width modulation chip is not actuated, pulse width modulation chip output the
Two control signals are to first starting module so that first starting module works, and first starting module is by the friendship
Galvanic electricity pressure is converted to supply voltage and exports to the pulse width modulation chip to start the pulse width modulation chip.
2. the power supply circuit of pulse width modulation chip as claimed in claim 1, it is characterised in that first starting module
Including the first rectification filtering unit and switch control unit；
The input terminal of first rectification filtering unit terminates the primary as the input of first starting module
The Same Name of Ends of the auxiliary winding of side, the output terminal of first rectification filtering unit connect with the input terminal of the switch control unit
Connect, the controlled end of the switch control unit is the controlled end of first starting module, the output of the switch control unit
Hold as the output terminal of first starting module；
First rectification filtering unit is depressured the alternating voltage and rectification handles to obtain DC voltage, the switch
Control unit is realized conducting and is disconnected under the control of the first control signal and second control signal.
3. the power supply circuit of pulse width modulation chip as claimed in claim 2, it is characterised in that first rectifying and wave-filtering
Unit includes capacitance C7, capacitance C8, resistance R34, the 7th diode, the 9th diode and the 8th voltage-stabiliser tube；
The first end of the capacitance C7 and the first end of the resistance R34 connect the input to form first rectification filtering unit altogether
End, the second end of the capacitance C7 and the anode of the second end of the resistance R34 and the 7th diode connect altogether, and the described 7th
The cathode of diode and first end, the cathode of the 9th diode and the cathode of the 8th voltage-stabiliser tube of the capacitance C8 are total to
Connect the output terminal to form first rectification filtering unit, the anode of the second end of the capacitance C8 and the 9th diode and
The anode of 8th voltage-stabiliser tube is connected to ground altogether.
4. the power supply circuit of pulse width modulation chip as claimed in claim 2, it is characterised in that the switch control unit
Including resistance R31, resistance R32, resistance R33, second switch pipe and the 3rd switching tube；
The input terminal of the extremely described switch control unit of transmitting of 3rd switching tube, the collector of the 3rd switching tube connect
The first end of the resistance R31, the base stage of the 3rd switching tube and the first end of the resistance R32 and the second switch pipe
Emitter connect altogether, the base stage of the second switch pipe connects the first end of the resistance R33, the collector of the second switch pipe
Ground connection, the second end of the resistance R31 and the second end of the resistance R32 connect the output to form the switch control unit altogether
End, the second end of the resistance R33 are the controlled end of the switch control unit.
5. the power supply circuit of pulse width modulation chip as claimed in claim 1, it is characterised in that second starting module
Including the second rectification filtering unit and energy-storage units；
The first input end of second rectification filtering unit terminates the transformer as the input of second starting module
The Same Name of Ends of the auxiliary winding of primary side, the first end of the output terminal and the energy-storage units of second rectification filtering unit are total to
Connect the output terminal to form second starting module, the different name end of the auxiliary winding of the transformer primary and described second whole
The second input terminal, the second end of the energy-storage units and the ground terminal of the pulse width modulation chip of stream filter unit connect altogether
Yu Di.
6. the power supply circuit of pulse width modulation chip as claimed in claim 5, it is characterised in that second rectifying and wave-filtering
Unit includes the tenth pole pipe, resistance R35 and capacitance C12；
The anode of tenth pole pipe is the first input end of second rectification filtering unit, and the cathode of the tenth pole pipe connects
The first end of the resistance R35, the second end of the resistance R35 and the first end of the capacitance C12 connect to form described second altogether
The output terminal of rectification filtering unit, the second end of the capacitance C12 are the second input terminal of second rectification filtering unit.
7. the power supply circuit of pulse width modulation chip as claimed in claim 5, it is characterised in that the energy-storage units include
Electrolytic capacitor C11；The first end and second end of the electrolytic capacitor C11 is respectively the first end and second of the energy-storage units
End.
A kind of 8. Switching Power Supply, it is characterised in that including such as claim 1-7 any one of them power supply circuit, further include with
The pulse width modulation chip of the power supply circuit connection and the alternating current-direct current being connected with the pulse width modulation chip turn
Change circuit.
9. Switching Power Supply as claimed in claim 8, it is characterised in that the ac-dc converter circuit includes voltage conversion mould
Block, current feedback module, switch module and voltage feedback module；
The voltage transformation module connects with the current feedback module, the switch module and the voltage feedback module respectively
Connect, the current feedback module, the switch module and the voltage feedback module respectively with the pulse width modulation chip
Connection；
The voltage transformation module incoming transport electricity exports direct current, the voltage transformation module output feedback electricity after treatment
Stream provides starting current, the voltage transformation module output by the current feedback module to the pulse width modulation chip
Feedback voltage is by the voltage feedback module to the pulse width modulation chip, and the pulse width modulation chip is according to institute
The pulse signal of feedback voltage output different duty is stated to the switch module, the switch module is according to the pulse signal
Control the direct current of the voltage transformation module output voltage stabilization.
10. Switching Power Supply as claimed in claim 9, it is characterised in that the voltage transformation module includes the transformer；
The transformer includes the armature winding and auxiliary winding and the secondary coil for being located at primary side for being located at primary side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721104184.1U CN207234665U (en) | 2017-08-30 | 2017-08-30 | A kind of power supply circuit and Switching Power Supply of pulse width modulation chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721104184.1U CN207234665U (en) | 2017-08-30 | 2017-08-30 | A kind of power supply circuit and Switching Power Supply of pulse width modulation chip |
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| Publication Number | Publication Date |
|---|---|
| CN207234665U true CN207234665U (en) | 2018-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721104184.1U Active CN207234665U (en) | 2017-08-30 | 2017-08-30 | A kind of power supply circuit and Switching Power Supply of pulse width modulation chip |
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| CN (1) | CN207234665U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332435A (en) * | 2017-08-30 | 2017-11-07 | 合肥惠科金扬科技有限公司 | The power supply circuit and Switching Power Supply of a kind of pulse width modulation chip |
-
2017
- 2017-08-30 CN CN201721104184.1U patent/CN207234665U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332435A (en) * | 2017-08-30 | 2017-11-07 | 合肥惠科金扬科技有限公司 | The power supply circuit and Switching Power Supply of a kind of pulse width modulation chip |
| CN107332435B (en) * | 2017-08-30 | 2023-10-20 | 合肥惠科金扬科技有限公司 | Power supply circuit of pulse width modulation chip and switching power supply |
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