CN207664884U - A kind of switching power circuit - Google Patents
A kind of switching power circuit Download PDFInfo
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- CN207664884U CN207664884U CN201721483283.5U CN201721483283U CN207664884U CN 207664884 U CN207664884 U CN 207664884U CN 201721483283 U CN201721483283 U CN 201721483283U CN 207664884 U CN207664884 U CN 207664884U
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Abstract
A kind of switching power circuit, including：Rectification circuit, switching power source chip, high frequency transformation coil, switching power source chip power supply circuit, voltage feedback circuit, current control circuit, control panel drives and the power supply circuit of other 12V circuits, the power supply circuit of MCU and other 3.3V circuits, it is combined using high frequency transformation coil and switching power source chip, high voltage power supply is effectively converted into multiple low-tension supplies to power to different circuits, also with integrated switching power source chip can directly self feedback voltage and regulation and control electric current, realize the protection to electric appliance, external MOS and IGBT pipes circuit element is eliminated in circuit, reduce cost, design complexities are low.
Description
Technical field
The utility model belongs to field of switch power, specially a kind of switching power circuit.
Background technology
Switching Power Supply is also known as exchange type power, switch converters, is a kind of high frequency device for converting electric energy, function be by
The voltage of one standard is converted into the required voltage of user terminal or electric current through various forms of frameworks.The use of Switching Power Supply
It becoming increasingly popular with the development of technology, this mode has been powered for telephone set, set-top box, video recorder, charger for mobile phone,
PDA (personal digital assistant) uses Switching Power Supply.Traditional linear power supply is that alternating current is reduced voltage amplitude by transformer
Value obtains the DC voltage with small ripple voltage using pulse direct current is obtained after rectifier circuit rectifies by filtering,
Reach high-precision DC voltage, it is necessary to carry out voltage stabilizing by regulator circuit, therefore for linear power supply, it is only necessary to using change
Depressor, rectifier, filter capacitor and voltage-stablizer may make up linear power supply, and simple in structure, cost is relatively low.Opposite switch electricity
The structure in source is then complicated more, and 380V small-powers AC power is mostly used in commercial power in the market, needs multiple frequency converters pair
AC power be repeatedly converted and realizes to different master die power supplies, mostly uses switching power source chip and external MOS
Or IGBT pipes convert to do the voltage of Switching Power Supply, circuit is complicated, cost is higher, reliability is relatively low.
In view of this, in order to solve the defect that above-mentioned Switching Power Supply is of high cost, circuit is complicated, reliability is low, urgent need will carry
Go out a kind of simple, low power, the reliable power switch circuit of circuit, the utility model proposes a kind of switch power supplies
Road, including：Rectification circuit, switching power source chip, high frequency transformation coil, switching power source chip power supply circuit, voltage feedback circuit,
The power supply circuit of current control circuit, the power supply circuit of control panel driving and other 12V circuits, MCU and other 3.3V circuits, is adopted
It is combined with high frequency transformation coil and switching power source chip, high voltage power supply is effectively converted into multiple low-tension supplies to different circuits
Power supply, also with integrated switching power source chip can directly self feedback voltage and regulation and control electric current, realize to electric appliance
Protection, eliminates external MOS and IGBT pipes circuit element, reduces cost, design complexities are low in circuit.
Utility model content
A kind of switching power circuit, including：Rectification circuit 1, switching power source chip 2, high frequency transformation coil 3, Switching Power Supply
Chip power supply circuit 4, voltage feedback circuit 5, current control circuit 6, control panel driving and other 12V circuits power supply circuit 7,
The power supply circuit 8 of MCU and other 3.3V circuits, wherein switching power source chip 2 include the port VCC, D, S, G, FB, the rectification
AC power is rectified into DC power supply by circuit 1, and switching power source chip is separately connected by the primary coil of high frequency transformation coil 3
2 ports D and the power supply circuit 7 of control panel driving and other 12V circuits, and the secondary coil of high frequency transformation coil 3 point
The power supply circuit 8 of other connecting valve power supply chip power supply circuit 4 and MCU and other 3.3V circuits, the Switching Power Supply core
Piece power supply circuit 4 is connected to the ports VCC of switching power source chip 2, anti-from the secondary coil extraction voltage of high frequency transformation coil 3
Current feed circuit 5 to the ports FB of switching power source chip 2, the ports S of switching power source chip 2 is connected to by current control circuit 6
Ground.
Further, the rectification circuit 1 is mainly made of AC power, fuse, rectifier bridge, the fuse
Overload protective function mainly is played to power supply, the method for rectifying of the rectifier bridge is halfwave rectifier, full-wave rectification, bridge rectifier
At least one of, four diodes of bridge rectifier or two diodes are packaged by rectifier bridge.Preferably, described
Rectification circuit 1 in be equipped with varistor in parallel with AC power, using the nonlinear characteristic of varistor, when overvoltage appearance
In two interpolars of varistor, varistor can clamp the voltage at a relatively-stationary voltage value, to realize in electricity
Protection power source control panel when net surge；Preferably, capacitance is equipped in the rectification circuit 1 after rectifier bridge rectification
One C1 and two C2 of capacitance is filtered, and the pressure voltage of capacitance can be increased by carrying out series connection using two capacitances；Preferably, whole
Associate coil T2 is equipped in current circuit between AC power and rectifier bridge, filters out the interference of power supply high-frequency harmonic.
Further, the high frequency transformation coil 3 and switching power source chip 2 form switching power circuit, described
There are high frequency transformation coil 32 coils, respectively primary coil and secondary coil, primary coil to be driven and be powered by control panel
Voltage after rectification is converted to 12V and supplies electricity to the driving circuit of control panel and the potential circuit of other electricity consumption 12V by circuit 7,
Voltage after rectification is converted to the electricity that 3.3V supplies electricity to MCU and other electricity consumption 3.3V by secondary coil by MCU power supply circuits 8
Volt circuit, in addition, the power supply after rectification is connected to switch after primary coil, by diode D3 and zener diode D2
The poles D of power supply chip 2, the power supply after rectification are connected to switch after secondary coil, by switching power source chip power supply circuit 4
The poles VCC of power supply chip 2, it is preferred that the working frequency ＞ 10kHz of the high frequency transformation coil 3.
Further, the input voltage of the VCC of the switching power source chip 2 is 11.5V~23V, output voltage 1V
~30V, power are 850mW~950mW, are a high pressure, the offline switching regulator IC of low-power consumption, the Switching Power Supply
Chip 2 is an integrated chip, and reliability is high, including the port VCC, D, S, G, FB, it is preferred that the switching power source chip
Drain electrode and the source electrode that MOS, wherein D and S are MOS are equipped in 2, and the feedback voltage that the grid G of MOS is obtained by the ports FB is controlled
The switching speed of grid G processed adjusts the duty ratio of PWM, to adjust the size of voltage.
Further, the switching power source chip power supply circuit 4 is connected to the ports VCC of switching power source chip, is used for
It powers to switching power source chip, the switching power source chip power supply circuit is mainly by three R3 of resistance, diode D4, three C3 of capacitance
And capacitance four C4 compositions, wherein three C3 of capacitance and four C4 of capacitance mainly play filter action, the resistance of three R3 of resistance to power supply
Value is the Ω of 0 Ω~0.1, and one end that resistance three connects 3 secondary coil of high frequency transformation coil is connected to out by voltage feedback circuit 5
The FB feedback ports of powered-down source chip.
Further, the voltage of the 5 primary feedback switching power source chip of voltage feedback circuit, switching power source chip root
According to the switching speed of grid G in the voltage cut-out power supply chip of feedback, that is, the duty ratio of PWM is adjusted, to adjust voltage
Size.The voltage feedback circuit 5 is mainly composed in series by four R4 of resistance and five R5 of resistance, wherein the resistance of four R4 of resistance
It is worth ranging from 30k Ω~40k Ω, the Standard resistance range of five R5 of resistance is 5k Ω~15k Ω, it is preferred that increases a resistance six
R6 is in parallel with five R5 of resistance, convenient for adjusting circuit, accurate feedback switching power source chip supply voltage, the resistance of the resistance six
Value is 3k Ω~7k Ω.
Further, the current control circuit 6 is formed in parallel by eight R8 of resistance and nine R9 of resistance, switching power source chip
The poles S be connected to the ground by current control circuit 6, the current control circuit 6 control switching power source chip electric current,
Nine R9 of middle resistance is not connected to, and eight R8 of resistance is a fixed value resistance, and Standard resistance range is the Ω of 1 Ω~2, therefore passes through feedback voltage tune
The size of voltage is saved, and then adjusts the size of electric current.
Further, the power supply circuit 7 of control panel driving and other 12V circuits is mainly by the power supply electricity after rectification
Pressure is converted to the voltage of 12V, is used for powering to the driving circuit of control panel and the potential circuit of other 12V.The MCU and
Supply voltage after rectification is mainly converted to the voltage of 3.3V by the power supply circuit 8 of other 3.3V circuits, be used for MCU and its
The potential circuit of its 3.3V is powered.
Using a kind of switching power circuit as described above, circuit is simple, at low cost, reliability is high.Specifically, using high
Frequency transformation coil and switching power source chip combine, and circuit is simple, instead of external MOS and IGBT pipes circuit element before, at
This is relatively low, and switching power source chip is an integrated chip, and reliability is high, using the characteristic of switching power source chip itself, according to
The feedback voltage arrived adjusts the size of voltage, and then adjusts the size of electric current, meets the different electronic apparatus of various rated current
It uses, the power supply to various different voltages circuits is met by high frequency transformation coil.
Description of the drawings：
Specific implementation mode is described further below in conjunction with the accompanying drawings, wherein：
Fig. 1 is the circuit frame figure of the utility model.
Fig. 2 is the circuit diagram of the utility model.
Primary structure number explanation
| 1 | Rectification circuit |
| 2 | Switching power source chip |
| 3 | High frequency transformation coil |
| 4 | Switching power source chip power supply circuit |
| 5 | Voltage feedback circuit |
| 6 | Current control circuit |
| 7 | Control panel drives and the power supply circuit of other 12V circuits |
| 8 | The power supply circuit of MCU and other 3.3V circuits |
Following specific implementation mode will further illustrate the utility model in conjunction with above-mentioned attached drawing.
Specific implementation mode
Specific implementation mode 1：
A kind of switching power circuit, including：Rectification circuit 1, switching power source chip 2, high frequency transformation coil 3, Switching Power Supply
Chip power supply circuit 4, voltage feedback circuit 5, current control circuit 6, control panel driving and other 12V circuits power supply circuit 7,
The power supply circuit 8 of MCU and other 3.3V circuits, wherein switching power source chip 2 include the port VCC, D, S, G, FB, the rectification
AC power is rectified into DC power supply by circuit 1, and switching power source chip is separately connected by the primary coil of high frequency transformation coil 3
2 ports D and the power supply circuit 7 of control panel driving and other 12V circuits, and the secondary coil of high frequency transformation coil 3 point
The power supply circuit 8 of other connecting valve power supply chip power supply circuit 4 and MCU and other 3.3V circuits, the Switching Power Supply core
Piece power supply circuit 4 is connected to the ports VCC of switching power source chip 2, anti-from the secondary coil extraction voltage of high frequency transformation coil 3
Current feed circuit 5 to the ports FB of switching power source chip 2, the ports S of switching power source chip 2 is connected to by current control circuit 6
Ground.
Wherein certain electric appliance input voltage can be in 110V~380V, circuit output voltage 12v, output current 0.1A, electricity
Resistance R8 in flow control circuit is 1.3 Ω, and the feedback voltage of circuit is 12V, then the duty ratio tune of PWM is dropped according to feedback voltage
Whole is 10%.
Specific implementation mode 2：
A kind of switching power circuit, including：Rectification circuit 1, switching power source chip 2, high frequency transformation coil 3, Switching Power Supply
Chip power supply circuit 4, voltage feedback circuit 5, current control circuit 6, control panel driving and other 12V circuits power supply circuit 7,
The power supply circuit 8 of MCU and other 3.3V circuits, wherein switching power source chip 2 include the port VCC, D, S, G, FB, the rectification
AC power is rectified into DC power supply by circuit 1, and switching power source chip is separately connected by the primary coil of high frequency transformation coil 3
2 ports D and the power supply circuit 7 of control panel driving and other 12V circuits, and the secondary coil of high frequency transformation coil 3 point
The power supply circuit 8 of other connecting valve power supply chip power supply circuit 4 and MCU and other 3.3V circuits, the Switching Power Supply core
Piece power supply circuit 4 is connected to the ports VCC of switching power source chip 2, anti-from the secondary coil extraction voltage of high frequency transformation coil 3
Current feed circuit 5 to the ports FB of switching power source chip 2, the ports S of switching power source chip 2 is connected to by current control circuit 6
Ground.
Wherein certain electric appliance input voltage can be in 110V~380V, circuit output voltage 12v, output current 0.2A, electricity
Resistance R8 in flow control circuit is 1.3 Ω, and the feedback voltage of circuit is 12V, then the duty ratio tune of PWM is dropped according to feedback voltage
Whole is 20%.
Specific implementation mode 3：
A kind of switching power circuit, including：Rectification circuit 1, switching power source chip 2, high frequency transformation coil 3, Switching Power Supply
Chip power supply circuit 4, voltage feedback circuit 5, current control circuit 6, control panel driving and other 12V circuits power supply circuit 7,
The power supply circuit 8 of MCU and other 3.3V circuits, wherein switching power source chip 2 include the port VCC, D, S, G, FB, the rectification
AC power is rectified into DC power supply by circuit 1, and switching power source chip is separately connected by the primary coil of high frequency transformation coil 3
2 ports D and the power supply circuit 7 of control panel driving and other 12V circuits, and the secondary coil of high frequency transformation coil 3 is distinguished
The power supply circuit 8 of connecting valve power supply chip power supply circuit 4 and MCU and other 3.3V circuits, the switching power source chip
Power supply circuit 4 is connected to the ports VCC of switching power source chip 2, feeds back electricity from the secondary coil extraction voltage of high frequency transformation coil 3
Road 5 to the ports FB of switching power source chip 2, the ports S of switching power source chip 2 are connected to the ground by current control circuit 6.
Wherein certain electric appliance input voltage can be in 110V~380V, circuit output voltage 12v, output current 0.5A, electricity
Resistance R8 in flow control circuit is 1.3 Ω, and the feedback voltage of circuit is 12V, then the duty ratio tune of PWM is dropped according to feedback voltage
Whole is 50%.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (9)
1. a kind of switching power circuit, including：Rectification circuit, switching power source chip, high frequency transformation coil, switching power source chip supply
Circuit, voltage feedback circuit, current control circuit, control panel driving and the power supply circuits of other 12V circuits, MCU and other
The power supply circuit of 3.3V circuits, wherein switching power source chip include the port VCC, D, S, G, FB, and the rectification circuit will exchange
Power rectifier at DC power supply, by the primary coil of high frequency transformation coil be separately connected switching power source chip the ports D and
Control panel drives and the power supply circuit of other 12V circuits, and the secondary coil of high frequency transformation coil is separately connected Switching Power Supply core
The power supply circuit of piece power supply circuit and MCU and other 3.3V circuits, the switching power source chip power supply circuit are connected to out
The ports VCC of powered-down source chip, from the secondary coil extraction voltage feedback circuit of high frequency transformation coil to switching power source chip
The ports S of the ports FB, switching power source chip are connected to the ground by current control circuit.
2. switching power circuit as described in claim 1, it is characterised in that：The rectification circuit mainly by AC power,
Fuse, rectifier bridge composition, the fuse mainly play overload protective function, the rectification square of the rectifier bridge to power supply
Method is halfwave rectifier, full-wave rectification, at least one of bridge rectifier, and rectifier bridge is by four diodes of bridge rectifier or two
A diode is packaged.
3. switching power circuit as described in claim 1, it is characterised in that：In the rectification circuit be equipped with varistor with
AC power is in parallel, realizes protection power source control panel when power grid surge；In rectifier bridge rectification in the rectification circuit
It is equipped with two capacitor filterings later, the pressure voltage of capacitance can be increased by carrying out series connection using two capacitances；It is handed in the rectification circuit
It is equipped with associate coil between galvanic electricity source and rectifier bridge, filters out the interference of power supply high-frequency harmonic.
4. switching power circuit as described in claim 1, it is characterised in that：The working frequency ＞ of the high frequency transformation coil
10kHz。
5. switching power circuit as described in claim 1, it is characterised in that：The input of the VCC of the switching power source chip
Voltage is 11.5V~23V, and output voltage is 1V~30V, and power is 850mW~950mW.
6. switching power circuit as described in claim 1, it is characterised in that：MOS is equipped in the switching power source chip,
Middle D and S is drain electrode and the source electrode of MOS, and the feedback voltage that the grid G of MOS is obtained by the ports FB controls the switch of grid G
Speed adjusts the duty ratio of PWM, to adjust the size of voltage.
7. switching power circuit as described in claim 1, it is characterised in that：The voltage feedback circuit is mainly by resistance four
Be composed in series with resistance five, the wherein Standard resistance range of resistance four is 30k Ω~40k Ω, the Standard resistance range of resistance five be 5k Ω~
15k Ω, one resistance six of increase is in parallel with resistance five, convenient for adjusting circuit, accurate feedback switching power source chip supply voltage, electricity
The resistance value of resistance six is 3k Ω~7k Ω.
8. switching power circuit as described in claim 1, it is characterised in that：The current control circuit is by resistance eight and electricity
Resistance nine is formed in parallel, and the poles S of switching power source chip are connected to the ground by current control circuit, current control circuit control
The electric current of switching power source chip, wherein resistance nine do not access in circuit, and resistance eight is a fixed value resistance, and Standard resistance range is 1 Ω
~2 Ω, therefore by the size of feedback voltage adjusting voltage, and then adjust the size of electric current.
9. the switching power circuit as described in any one of claim 1~8, it is characterised in that：The high frequency becomes crimping
Circle and switching power source chip form switching power circuit, and the high frequency transformation coil has 2 coils, respectively primary side line
Circle and secondary coil, primary coil drive power supply circuit that the voltage after rectification is converted to 12V and supply electricity to control by control panel
The potential circuit of the driving circuit of plate and other electricity consumption 12V, secondary coil are turned the voltage after rectification by MCU power supply circuits
Chemical conversion 3.3V supplies electricity to the potential circuit of MCU and other electricity consumption 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721483283.5U CN207664884U (en) | 2017-11-09 | 2017-11-09 | A kind of switching power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721483283.5U CN207664884U (en) | 2017-11-09 | 2017-11-09 | A kind of switching power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207664884U true CN207664884U (en) | 2018-07-27 |
Family
ID=62938767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721483283.5U Active CN207664884U (en) | 2017-11-09 | 2017-11-09 | A kind of switching power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207664884U (en) |
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2017
- 2017-11-09 CN CN201721483283.5U patent/CN207664884U/en active Active
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