CN209676138U - A kind of Switching Power Supply - Google Patents
A kind of Switching Power Supply Download PDFInfo
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- CN209676138U CN209676138U CN201920369866.8U CN201920369866U CN209676138U CN 209676138 U CN209676138 U CN 209676138U CN 201920369866 U CN201920369866 U CN 201920369866U CN 209676138 U CN209676138 U CN 209676138U
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- power supply
- voltage
- power
- changing module
- switching
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Abstract
The utility model relates to power supply conversion art, specially a kind of Switching Power Supply comprising power supply main part and pulse width control circuit；Power supply main part includes power input, rectification module, power supply voltage changing module, filter module and power output end；Power supply voltage changing module includes transformer T1 and switching tube Q1, and switching tube Q1 is connected to the primary coil of transformer T1, and switching tube Q1 controls it by pwm signal and pulsewidth is connected；Pulse width control circuit is used to obtain the output voltage of power output end, and according to the comparison result of output voltage and internal reference voltage to switching tube Q1 output pwm signal with the conducting pulsewidth of control switch pipe Q1；By output voltage stabilization in the range of demand voltage, reduce because output voltage deviation is excessive to influence the normal work of electrical equipment the case where.
Description
Technical field
The utility model relates to power supply conversion arts, more particularly, to a kind of Switching Power Supply.
Background technique
Switching Power Supply is used much in life, industrial automation machinery, electrical equipment, household electrical appliance, electronic instrument, if
Standby and device etc. is multi-field to use Switching Power Supply, the Switching Power Supply of high performance-price ratio can better meet equipment industrial automation with
And the application of other occasions.
Switching Power Supply is also known as exchange type power, switch converters, is a kind of high frequency device for converting electric energy, is power supply supply
One kind of device.Its function is that the voltage of a level is converted to the required voltage of user terminal through various forms of frameworks
Or electric current.The input of Switching Power Supply is AC power source (such as alternating current) or DC power supply mostly, and exporting mostly is to need directly
The equipment in galvanic electricity source, such as PC, and Switching Power Supply just carries out the conversion of voltage and current between the two.
In the output voltage and larger demand voltage deviation of Switching Power Supply, the normal work of electrical equipment will affect.
Utility model content
The purpose of the utility model is to provide a kind of Switching Power Supply, have the advantages that export stable voltage.
The above-mentioned purpose of the utility model has the technical scheme that
A kind of Switching Power Supply, including power supply main part and pulse width control circuit；
The power supply main part includes that power input, rectification module, power supply voltage changing module, filter module and power supply are defeated
Outlet, the rectification module to the input power that power input accesses carry out rectification processing and export to power supply voltage changing module into
The processing of row transformation is filtered after input power is rectified and transformation processing through filter module, and as out-put supply from
Power output end output；
The power supply voltage changing module includes transformer T1 and switching tube Q1, and switching tube Q1 is connected to the primary side line of transformer T1
Circle, the switching tube Q1 control it by pwm signal and pulsewidth are connected；
The pulse width control circuit is used to obtain the output voltage of power output end, and according to output voltage and internal reference
The comparison result of voltage is to switching tube Q1 output pwm signal with the conducting pulsewidth of control switch pipe Q1.
By using above-mentioned technical proposal, switching tube Q1 in response to pwm signal turn-on power voltage changing module power circuit,
To control the output voltage of power supply voltage changing module, and the conducting pulsewidth of switching tube Q1 is by the control of the duty ratio of pwm signal,
Pulse width control circuit exports the PWM of duty ratio corresponding according to the comparison result of output voltage and internal reference voltage to switching tube Q1
Signal controls the voltage of power output end, by output voltage stabilization in demand voltage with the conducting pulsewidth of control switch pipe Q1
In range, reduce because output voltage deviation is excessive to influence the normal work of electrical equipment the case where.
The utility model is further arranged to: the pulse width control circuit includes the electricity for detecting power output end voltage
Detection circuit and the pwm chip for sending pwm signal to switching tube Q1 are pressed, the pwm chip is according to output electricity
The duty ratio of pressure and the comparison result control pwm signal of internal reference voltage.
By using above-mentioned technical proposal, pwm chip is according to the output voltage control of power output end its output
The duty ratio of pwm signal, so that the conducting pulsewidth of control switch pipe Q1, realizes the tune to the output voltage of power supply voltage changing module
Section.
The utility model is further arranged to: the model NCP1203P60G of the pwm chip.
By using above-mentioned technical proposal, effective adjusting to the output voltage of power supply voltage changing module is realized.
The utility model is further arranged to: the voltage detecting circuit include resistance R123, resistance R124, resistance PR1,
Accurate voltage stabilizing chip KA431 and optocoupler OC1, voltage detecting circuit are obtained from the bleeder circuit that resistance R123, R124, PR1 are formed
To power output end sampling voltage and be sent to pwm chip through accurate voltage stabilizing chip KA431 and optocoupler OC1.
By using above-mentioned technical proposal, efficient sampling is carried out to the voltage of power output end, facilitates pwm chip control
Make the duty ratio of the pwm signal of its output.
The utility model is further arranged to: the switching tube Q1 is grounded through current sense resistor R8, and the PWM controls core
The current sense pin of piece is grounded through capacitor C37 and is connected between switching tube Q1 and current sense resistor R8 through resistance R11.
By using above-mentioned technical proposal, resistance R8, resistance R11, capacitor C37 and pwm chip form Switching Power Supply
Limit power circuit, the power of Switching Power Supply is controlled.
The utility model is further arranged to: common mode inductance LF1 is connected between the power input and rectification module.
By using above-mentioned technical proposal, the electromagnetic interference signal of common mode in Switching Power Supply is filtered, improves switch
Power supply exports quality.
The utility model is further arranged to: further including the temperature for detecting power supply voltage changing module and in power supply transformation mould
The temperature-control circuit of the power circuit for disconnecting power supply voltage changing module when the temperature is excessively high of block.
By using above-mentioned technical proposal, power supply voltage changing module when the temperature is excessively high, disconnect the logical of power supply voltage changing module
Electrical circuit, reduce because the temperature of power supply voltage changing module is excessively high burn out the case where, extend the service life of Switching Power Supply.
The utility model is further arranged to: the temperature-control circuit includes thermistor RTH2, potentiometer PR2, electricity
Resistance R25, triode VT1 and relay K1, thermistor RTH2 and potentiometer PR2 are serially connected, and the base stage of triode VT1 is through electricity
Resistance R25 is connected between thermistor RTH2 and potentiometer PR2, and the energization that triode VT1 is connected to the coil of relay K1 is returned
Lu Zhong, the normally-closed contact K1-1 of relay K1 are connected to the power circuit of power supply voltage changing module.
By using above-mentioned technical proposal, thermistor RTH2 detects the temperature of power supply voltage changing module, in power supply
When the temperature is excessively high, triode VT1 conducting, relay K1 is acted voltage changing module, and normally-closed contact K1-1 is disconnected, and disconnects power supply transformation
The power circuit of module, reduce because the temperature of power supply voltage changing module is excessively high burn out the case where.
The utility model is further arranged to: the relay K1 is the time relay of power cut off delay movement.
By using above-mentioned technical proposal, taken back again again after for a period of time in the power circuit for disconnecting power supply voltage changing module
Power supply voltage changing module avoids the case where on-off is repeated in the power supply voltage changing module short time.
The utility model is further arranged to: the power supply voltage changing module is parallel with spare voltage changing module, the relay
The normally opened contact K1-2 of K1 is connected to the power circuit of spare voltage changing module.
By using above-mentioned technical proposal, when disconnecting power supply voltage changing module, accesses spare voltage changing module and carry out transformation behaviour
Make, guarantees the normal work of Switching Power Supply.
In conclusion the advantageous effects of the utility model are as follows:
1. pulse width control circuit is corresponding to switching tube Q1 output with the comparison result of internal reference voltage according to output voltage
The pwm signal of duty ratio is controlled the voltage of power output end, output voltage stabilization is existed with the conducting pulsewidth of control switch pipe Q1
In the range of demand voltage；
2. power supply voltage changing module when the temperature is excessively high, disconnect power supply voltage changing module power circuit, reduce because power supply become
The temperature of die block is excessively high and the case where burning out；
3. accessing spare voltage changing module when disconnecting power supply voltage changing module and carrying out transformation operation, guarantee Switching Power Supply just
Often work.
Detailed description of the invention
Fig. 1 is the circuit diagram of rectification module in embodiment 1；
Fig. 2 is the circuit diagram of power supply voltage changing module in embodiment 1；
Fig. 3 is the circuit diagram of filter module in embodiment 1；
Fig. 4 is voltage detecting circuit and pwm chip circuit connection diagram in embodiment 1；
Fig. 5 is the connection schematic diagram of power supply voltage changing module and spare voltage changing module in embodiment 2.
Appended drawing reference: 1, power input；2, rectification module；3, power supply voltage changing module；4, filter module；5, power supply exports
End；6, voltage detecting circuit；7, pwm chip；8, spare voltage changing module.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
Embodiment 1: a kind of Switching Power Supply, especially a kind of 35W Switching Power Supply are shown in Fig. 1-Fig. 3, including power supply main part
And pulse width control circuit, wherein power supply main part includes that the power input 1, rectification module 2, power supply being successively electrically connected become
Die block 3, filter module 4 and power output end 5.
See Fig. 1, power input 1 is for accessing input power of the mains supply as Switching Power Supply, 2 pairs of electricity of rectification module
The input power that source input terminal 1 accesses carries out rectification processing, and rectification module 2 includes the rectifier bridge BD1 of model KBP208G, uses
In carrying out rectifying operation to electric main, common mode inductance LF1 is connected between power input 1 and rectification module 2, it is split powered-down
The electromagnetic interference signal of common mode is filtered in source, is improved Switching Power Supply and is exported quality.
See that the input power after rectification is exported to power supply voltage changing module 3 and carries out transformation processing, power supply by Fig. 2, rectification module 2
Voltage changing module 3 includes transformer T1 and switching tube Q1, and transformer T1 includes primary coil, secondary coil and ancillary coil, is opened
Pass pipe Q1 is NMOS tube, and drain electrode is connected to the primary coil of transformer T1, and source electrode is grounded through resistance R8, and switching tube Q1 passes through it
Grid receives pwm signal and controls its conducting pulsewidth, and ancillary coil provides power supply VCC for the device into Switching Power Supply.
See that Fig. 3, the filter module 4 formed after the rectified processing with transformation of input power through polarized capacitor and inductance are carried out
Filtering processing, and exported as out-put supply from power output end 5.
See that Fig. 4, pulse width control circuit are used to obtain the output voltage of power output end 5, and according to output voltage and inside
The comparison result of reference voltage is to switching tube Q1 output pwm signal with the conducting pulsewidth of control switch pipe Q1.
Specifically, pulse width control circuit include voltage detecting circuit 6 for detecting 5 voltage of power output end and for
Switching tube Q1 sends the pwm chip 7 of pwm signal, the model NCP1203P60G of pwm chip 7 in the present embodiment.
Voltage detecting circuit 6 includes resistance R123, resistance R124, resistance PR1, precision voltage stabilizing chip KA431 and optocoupler
OC1, resistance R123, R124, PR1 composition composition bleeder circuit, for being sampled from power output end 5 to output voltage, electricity
Pressure detection circuit 6 obtains the sampling voltage of power output end 5 and through essence from the bleeder circuit that resistance R123, R124, PR1 are formed
Close voltage stabilizing chip KA431 and optocoupler OC1 is sent to 2 pin VFB of pwm chip 7, pwm chip 7 according to output voltage with
The duty ratio of the comparison result control pwm signal of internal reference voltage.
The current sense pin ISEN of pwm chip 7 is grounded through capacitor C37 and is connected to switching tube Q1 through resistance R11
Between current sense resistor R8, resistance R8, resistance R11, capacitor C37 and pwm chip 7 form the limit power of Switching Power Supply
Circuit controls the power of Switching Power Supply.
The implementation principle of the present embodiment are as follows: switching tube Q1 is returned in response to the energization of pwm signal turn-on power voltage changing module 3
Road, to control the output voltage of power supply voltage changing module 3, and the conducting pulsewidth of switching tube Q1 is by the duty ratio of pwm signal
Control, pwm chip 7 export duty ratio corresponding to switching tube Q1 according to the comparison result of sampling voltage and internal reference voltage
Pwm signal with the conducting pulsewidth of control switch pipe Q1, the voltage of power output end 5 is controlled, by output voltage stabilization in demand
In the range of voltage, reduce because output voltage deviation is excessive to influence the normal work of electrical equipment the case where.
Embodiment 2: a kind of Switching Power Supply, the difference from embodiment 1 is that the difference of power supply voltage changing module 3, this implementation
In example, power supply voltage changing module 3 is parallel with spare voltage changing module 8(and sees Fig. 5), spare voltage changing module 8 includes transformer T2, transformer
T2 includes primary coil, secondary coil and ancillary coil, and the primary coil of transformer T2, secondary coil and ancillary coil
It is in parallel with the primary coil of transformer T1, secondary coil and ancillary coil respectively.
Further include the temperature for detecting power supply voltage changing module 3 and the disconnection when the temperature is excessively high of power supply voltage changing module 3 electricity
The temperature-control circuit of the power circuit of source voltage changing module 3, temperature-control circuit include thermistor RTH2, potentiometer PR2, electricity
The triode VT1 and relay K1 of R25, NPN type are hindered, relay K1 is the time relay of power cut off delay movement, thermistor
The one end RTH2 connects power supply VCC, and the other end is grounded through potentiometer PR2, and the base stage of triode VT1 is connected to temperature-sensitive through resistance R25
Between resistance RTH2 and potentiometer PR2, triode VT1 is connected in the power circuit of the coil of relay K1, relay K1's
Timing closing normally-closed contact K1-1 is connected to the power circuit of power supply voltage changing module 3, and the delay of relay K1 disconnects normally opened contact
K1-2 is connected to the power circuit of spare voltage changing module 8.
The course of work of the present embodiment the difference from embodiment 1 is that: temperature of the thermistor RTH2 to power supply voltage changing module 3
Degree detected, power supply voltage changing module 3 when the temperature is excessively high, triode VT1 conducting, relay K1 movement, normally-closed contact K1-
1 disconnect, disconnect power supply voltage changing module 3 power circuit, reduce because the temperature of power supply voltage changing module 3 is excessively high burn out the case where.
Simultaneously when disconnecting power supply voltage changing module 3, normally opened contact K1-2 closure accesses spare voltage changing module 8 and carries out transformation
Operation, guarantees the normal work of Switching Power Supply.
Restore normally and after relay K1 delay in the temperature of power supply voltage changing module 3, relay K1 resets, then connects again
Telegram in reply source voltage changing module 3 avoids the case where on-off is repeated in 3 short time of power supply voltage changing module.
The embodiment of the above specific embodiment is the preferred embodiment of the utility model, and not limitation is originally practical according to this
Novel protection scope, therefore: the equivalence changes that all structures, shape, principle according to the utility model are done should all be covered by this reality
Within novel protection scope.
Claims (10)
1. a kind of Switching Power Supply, it is characterised in that: including power supply main part and pulse width control circuit；
The power supply main part includes power input (1), rectification module (2), power supply voltage changing module (3), filter module (4)
With power output end (5), the input power that the rectification module (2) accesses power input (1) carries out rectification processing and defeated
Transformation processing is carried out to power supply voltage changing module (3) out, is filtered after the rectified processing with transformation of input power through filter module (4)
Wave processing, and exported as out-put supply from power output end (5)；
The power supply voltage changing module (3) includes transformer T1 and switching tube Q1, and switching tube Q1 is connected to the primary side line of transformer T1
Circle, the switching tube Q1 control it by pwm signal and pulsewidth are connected；
The pulse width control circuit is used to obtain the output voltage of power output end (5), and according to output voltage and internal reference
The comparison result of voltage is to switching tube Q1 output pwm signal with the conducting pulsewidth of control switch pipe Q1.
2. a kind of Switching Power Supply according to claim 1, it is characterised in that: the pulse width control circuit includes for detecting
The voltage detecting circuit (6) of power output end (5) voltage and for switching tube Q1 send pwm signal pwm chip
(7), the pwm chip (7) controls the duty of pwm signal according to the comparison result of output voltage and internal reference voltage
Than.
3. a kind of Switching Power Supply according to claim 2, it is characterised in that: the model of the pwm chip (7)
NCP1203P60G。
4. a kind of Switching Power Supply according to claim 2, it is characterised in that: the voltage detecting circuit (6) includes resistance
R123, resistance R124, resistance PR1, precision voltage stabilizing chip KA431 and optocoupler OC1, voltage detecting circuit (6) from resistance R123,
The sampling voltage of power output end (5) is obtained in the bleeder circuit of R124, PR1 composition and through accurate voltage stabilizing chip KA431 and light
Coupling OC1 is sent to pwm chip (7).
5. a kind of Switching Power Supply according to claim 3, it is characterised in that: the switching tube Q1 is through current sense resistor R8
Ground connection, the current sense pin of the pwm chip (7) be grounded through capacitor C37 and through resistance R11 be connected to switching tube Q1 and
Between current sense resistor R8.
6. a kind of Switching Power Supply according to claim 1, it is characterised in that: the power input (1) and rectification module
(2) common mode inductance LF1 is connected between.
7. a kind of Switching Power Supply according to claim 4, it is characterised in that: further include for detecting power supply voltage changing module
(3) the temperature control of temperature and the power circuit in the power supply of the disconnection when the temperature is excessively high voltage changing module (3) of power supply voltage changing module (3)
Circuit processed.
8. a kind of Switching Power Supply according to claim 7, it is characterised in that: the temperature-control circuit includes thermistor
RTH2, potentiometer PR2, resistance R25, triode VT1 and relay K1, thermistor RTH2 and potentiometer PR2 are serially connected, and three
The base stage of pole pipe VT1 is connected between thermistor RTH2 and potentiometer PR2 through resistance R25, and triode VT1 is connected to relay
In the power circuit of the coil of K1, the normally-closed contact K1-1 of relay K1 is connected to the power circuit of power supply voltage changing module (3).
9. a kind of Switching Power Supply according to claim 8, it is characterised in that: the relay K1 is power cut off delay movement
The time relay.
10. a kind of Switching Power Supply according to claim 9, it is characterised in that: the power supply voltage changing module (3) is parallel with standby
The power circuit of spare voltage changing module (8) is connected to the normally opened contact K1-2 of voltage changing module (8), the relay K1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920369866.8U CN209676138U (en) | 2019-03-21 | 2019-03-21 | A kind of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920369866.8U CN209676138U (en) | 2019-03-21 | 2019-03-21 | A kind of Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209676138U true CN209676138U (en) | 2019-11-22 |
Family
ID=68572480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920369866.8U Expired - Fee Related CN209676138U (en) | 2019-03-21 | 2019-03-21 | A kind of Switching Power Supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209676138U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112558535A (en) * | 2021-02-25 | 2021-03-26 | 三门康创电子科技有限公司 | Oxygenerator control circuit, oxygenerator and oxygenerator control method |
-
2019
- 2019-03-21 CN CN201920369866.8U patent/CN209676138U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112558535A (en) * | 2021-02-25 | 2021-03-26 | 三门康创电子科技有限公司 | Oxygenerator control circuit, oxygenerator and oxygenerator control method |
| CN112558535B (en) * | 2021-02-25 | 2021-05-07 | 三门康创电子科技有限公司 | Oxygenerator control circuit, oxygenerator and oxygenerator control method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191122 Termination date: 20210321 |
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| CF01 | Termination of patent right due to non-payment of annual fee |