CN207039475U - A kind of supply voltage automatic switch-over circuit - Google Patents
A kind of supply voltage automatic switch-over circuit Download PDFInfo
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- CN207039475U CN207039475U CN201721052912.9U CN201721052912U CN207039475U CN 207039475 U CN207039475 U CN 207039475U CN 201721052912 U CN201721052912 U CN 201721052912U CN 207039475 U CN207039475 U CN 207039475U
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Abstract
The utility model discloses a kind of supply voltage automatic switch-over circuit, include EMI circuits by using in a power, ac voltage input mouth, ac rectifier, pwm control circuit, voltage conversion circuit, rectifying and wave-filtering output circuit, voltage feedback circuit, the first photoelectric coupled circuit, in the case of power work is normal, small household appliances or the toy power supply that it is mobile phone to export as 5V voltages and supply voltage is 5V, when small household appliances or the toy charging for being 12V for tablet personal computer and supply voltage, automatic identification simultaneously exports 5V voltage conversion and powered for 12V to equipment.By automatic switchover output voltage, solve existing charger unicity, diversification use can not be changed, the problem of causing the wasting of resources and environmental pollution.Meanwhile by the overpower protection of output protection circuit, overcurrent protection, over-voltage protection function, realize perfect intelligent protection function.
Description
Technical field
The utility model belongs to power circuit field, more particularly to a kind of supply voltage automatic switch-over circuit.
Background technology
In the small of all DC5V or 12V power supplies of purchase mobile phone, tablet personal computer, toy, shaver, family expenses flashlight etc.
During household appliances, a charger or power supply are equipped with, these most power supplys can share one in fact.So
It is individual at most more than 10 and 3-5 is individual at least for each family charger now, exist everywhere, but be not commonly used；If losing, then
Huge pollution can be caused to environment.According to news report, electronic component in soil 100 years it is also non-degradable, but also contain
More heavy metal and harmful substance, in order to protect national environment, the expenses of many annual all both expensives of country is by this country
Electronic waste sea-freight abandons to uncultivated place.
In view of this, the present inventor specially devises a kind of supply voltage automatic switch-over circuit, thus this case produces.
Utility model content
The purpose of this utility model is to provide a kind of supply voltage automatic switch-over circuit, passes through automatic switchover and export electricity
Pressure, solve existing charger unicity, diversification use, the problem of causing the wasting of resources and environmental pollution can not be changed.
To achieve these goals, the technical solution adopted in the utility model is as follows：
A kind of supply voltage automatic switch-over circuit, including ac voltage input mouth, ac rectifier, PWM control electricity
Road, voltage conversion circuit, rectifying and wave-filtering output circuit, voltage feedback circuit, the first photoelectric coupled circuit；
The ac voltage input mouth, is connected with the input of the ac rectifier, for input ac voltage,
And it is sent to the ac rectifier；
The output end of the ac rectifier, it is connected with the input of the voltage conversion circuit, for by the friendship
Stream voltage commutation is DC voltage, and is sent to the voltage conversion circuit；
The output end of the pwm control circuit, it is connected with the input of the voltage conversion circuit, is opened for exporting PWM
OFF signal, there is provided coupling energy, and it is sent to the voltage conversion circuit；
The output end of the voltage conversion circuit, the input with the rectifying and wave-filtering output circuit, PWM controls are electric respectively
The input on road is connected, for according to the DC voltage and pwm switching signal, output switch power source, for PWM control electricity
Road provides power supply, and is sent to the rectifying and wave-filtering output circuit；
The output end of the rectifying and wave-filtering output circuit, is connected with the input of the voltage feedback circuit, for filtering out
The ripple of the Switching Power Supply, and filtered Switching Power Supply is sent to the voltage feedback circuit；
The output end of the voltage feedback circuit, it is connected with the input of first photoelectric coupled circuit, it is described for feeding back
Switching Power Supply, and it is sent to first photoelectric coupled circuit；
The output end of first photoelectric coupled circuit, it is sent to for isolating the Switching Power Supply, and by the Switching Power Supply
The pwm control circuit, switch control time is provided for the pwm control circuit.
Preferably, EMI circuits are provided between the ac voltage input mouth and the input of ac rectifier, are used
In the electromagnetic interference signal for filtering out the alternating voltage.
Preferably, output protection circuit is provided with the output end of the rectifying and wave-filtering output circuit, for protecting described open
Powered-down source.
Preferably, the output end of the output protection circuit is provided with the second photoelectric coupled circuit, for isolating the Switching Power Supply.
Preferably, the EMI circuits include a fuse, a Y capacitance, a common mode inductance；
The first port of the fuse, it is connected with the ac voltage input mouth L；Second end of the fuse
Mouthful, it is connected with the first port of the Y capacitance；
The second port of the Y capacitance, it is connected with the ac voltage input mouth N；
The first port of the common mode inductance, it is connected with the second port of the fuse；The second of the common mode inductance
Port, it is connected with the ac voltage input mouth N.
Preferably, the ac rectifier includes a bridge rectifier and a high-voltage energy storage capacitor；
The first port of the bridge rectifier, it is connected with the 3rd port of the common mode inductance；The bridge rectifier
Second port, be connected with the 4th port of the common mode inductance；3rd port of the bridge rectifier, stored up with the high pressure
The negative electrode of energy electric capacity is connected；4th port of the bridge rectifier, is connected with the anode of the high-voltage energy storage capacitor；
The anode of the high-voltage energy storage capacitor, it is connected with the input of the voltage conversion circuit；The high-voltage energy storage electricity
The negative electrode of appearance, is connected with ground signalling.
Preferably, the output protection circuit includes an overpower-protection circuit, a circuit overcurrent protection, an overvoltage
Protection circuit.
The beneficial effects of the utility model are：
A kind of supply voltage automatic switch-over circuit provided by the utility model, include EMI by using in a power
Circuit, ac voltage input mouth, ac rectifier, pwm control circuit, voltage conversion circuit, rectifying and wave-filtering output circuit,
Voltage feedback circuit, the first photoelectric coupled circuit, in the case of power work is normal, it is mobile phone and supply voltage to export as 5V voltages
Small household appliances or toy power supply for 5V, it is automatic to know when small household appliances or the toy charging for being 12V for tablet personal computer and supply voltage
Voltage conversion that is other and exporting 5V is powered for 12V to equipment.By automatic switchover output voltage, it is single to solve existing charger
Property, diversification use, the problem of causing the wasting of resources and environmental pollution can not be changed.Meanwhile the mistake for passing through output protection circuit
Power is protected, and overcurrent protection, over-voltage protection function, realizes perfect intelligent protection function.
Brief description of the drawings
Fig. 1 is system block diagram of the present utility model；
Fig. 2 is EMI circuits of the present utility model and ac rectifier embodiment schematic diagram；
Fig. 3 is embodiment schematic diagram of the present utility model.
Embodiment
A kind of supply voltage automatic switch-over circuit, including ac voltage input mouth, ac rectifier, PWM control electricity
Road, voltage conversion circuit, rectifying and wave-filtering output circuit, voltage feedback circuit, the first photoelectric coupled circuit；
Ac voltage input mouth, it is connected with the input of ac rectifier, for input ac voltage, and is sent to
Ac rectifier；
The output end of ac rectifier, it is connected with the input of voltage conversion circuit, for being by ac voltage rectifier
DC voltage, and it is sent to voltage conversion circuit；
The output end of pwm control circuit, it is connected with the input of voltage conversion circuit, for exporting pwm switching signal, carries
For coupling energy, and it is sent to voltage conversion circuit；
The output end of voltage conversion circuit, respectively with the input of the input, pwm control circuit of rectifying and wave-filtering output circuit
End is connected, for according to DC voltage and pwm switching signal, output switch power source, power supply being provided for pwm control circuit, and pass
Deliver to rectifying and wave-filtering output circuit；
The output end of rectifying and wave-filtering output circuit, it is connected with the input of voltage feedback circuit, for filtering out Switching Power Supply
Ripple, and filtered Switching Power Supply is sent to voltage feedback circuit；
The output end of voltage feedback circuit, it is connected with the input of the first photoelectric coupled circuit, for feedback switch power supply, and passes
Deliver to the first photoelectric coupled circuit；
The output end of first photoelectric coupled circuit, pwm control circuit is sent to for isolating switch power, and by Switching Power Supply,
Switch control time is provided for pwm control circuit.
As shown in figure 1, being provided with EMI circuits between ac voltage input mouth and the input of ac rectifier, use
In the electromagnetic interference signal for filtering out alternating voltage.
Output protection circuit is provided with the output end of rectifying and wave-filtering output circuit, for protection switch power supply.
The output end of output protection circuit is provided with the second photoelectric coupled circuit, for isolating switch power.
As shown in Fig. 2 EMI circuits include a fuse, a Y capacitance, a common mode inductance；
The first port of fuse, it is connected with ac voltage input mouth L；The second port of fuse, with Y capacitance
Single port is connected；
The second port of Y capacitance, it is connected with ac voltage input mouth N；
The first port of common mode inductance, it is connected with the second port of fuse；The second port of common mode inductance, with alternating current
Pressure input port N is connected.
As shown in Fig. 2 ac rectifier includes a bridge rectifier and a high-voltage energy storage capacitor；
The first port of bridge rectifier, it is connected with the 3rd port of common mode inductance；The second port of bridge rectifier, with
4th port of common mode inductance is connected；3rd port of bridge rectifier, is connected with the negative electrode of high-voltage energy storage capacitor；Bridge rectifier
4th port of device, is connected with the anode of high-voltage energy storage capacitor；
The anode of high-voltage energy storage capacitor, it is connected with the input of voltage conversion circuit；The negative electrode of high-voltage energy storage capacitor, with connecing
Earth signal is connected.
Output protection circuit includes an overpower-protection circuit, a circuit overcurrent protection, an excess voltage protection.
It is connected as shown in figure 3, EMI circuit input end L lines meet fuse F1, EMI electric capacity CX1 with L lines and N lines, then L
Line reconnects L1 common mode inductances, composition EMI anti-clutter circuits with N lines
The AC rectification of EMI circuit parts is that DC voltage is conveyed to high pressure again by the bridge rectifier of ac rectifier
Energy storage Y capacitance C2 is filtered.
Pwm control circuit, resistance R1 one end connection electric capacity C2 positive pole, resistance R1 other end connection chip IC 3
5 pin power supply be provided start voltage, the 6 pin outputting drive voltages connection resistance R8 driving Q2 of chip IC 3 carries out switch motion, Q2
The pin of D poles connection transformer the 1st winding 2, give transformer to provide coupling energy.
After the pwm control circuit Q2 of voltage conversion circuit starts switch motion, the transformer T1 pin of the 1st winding 1 connection is whole
The electric capacity C2 of filtering part positive pole is flowed, provides energy from electric capacity C2 positive pole to transformer, transformer proceeds by voltage change
Change, the voltage that the voltage 320V of electric capacity C2 positive pole is transformed to 18V is supplied to 3 pin of the 2nd winding, and 3 pin D2 of the 2nd winding are whole
Flow tube carries out rectification, reconnects electric capacity C4 and is filtered, and reconnects Q1 electric capacity C poles, and Q1 B poles connect D3 negative pole, D3's
Positive pole connects 4 pin of T1 transformers, resistance R7 one end connection D3 negative pole, and the other end connects D2 negative pole, composition PWM controls
The stable power-supplying source of circuit, it is the basis of pwm control circuit steady operation.At the same time, the voltage 320V of electric capacity C2 positive pole
The voltage for being transformed to 5V is supplied to 8 pin of the windings of T1 the 3rd
The voltage that the voltage 320V of the electric capacity C2 of rectifying and wave-filtering output circuit positive pole is transformed to 5V is supplied to the windings of T1 the 3rd
8 pin connections D4 positive pole, by the AC power rectification from transformer for pulsation DC voltage, D4 negative pole connection electricity
Hold C8 positive pole, equipment is used for pure DC voltage supply come the in-line filtration pulsed by D8.
Multivoltage feedback circuit when the use of equipment be 5V supply voltages, resistance R18 and chip IC 4, resistance R15, core
Piece IC1, resistance R20, electric capacity C7 composition voltage voltage stabilizing backfeed loops, the resistance R18 first ends connection electric capacity C8 is just
Pole, the ends of resistance R18 second connection resistance R21 first end, reconnects the resistance R pin of chip IC 5 and 1 pin of chip IC 4, composition
Reference voltage is detected, and resistance R15 first end, resistance R15 the 2nd end connection chip are connected by the 3rd pin of chip IC 4
IC1 the 2nd pin, the 1st pin connection electric capacity C8 of chip IC 1 positive pole, the 4th pin connection resistance R12 of chip IC 1 first end,
Resistance R12 the second end connects the 2nd pin of chip IC 3, and chip I C4 the 3rd pin carrys out control chip IC1 switch on intensity optical coupling
The 4th pin to the chip IC 1 of PWM control sections feeds back to the 2nd pin of chip IC 3, the output of control chip IC3 the 6th pin again
Time, to control 5V output voltage stabilizations.
When it is 12V supply voltages to use equipment, resistance R18, resistance R19, Q4, resistance R27, resistance R30, with chip
IC4, resistance R15, chip IC 1, resistance R20, electric capacity C7 composition voltage voltage stabilizing backfeed loop, the resistance R18 first ends
Connect electric capacity C8 positive pole, the ends of resistance R18 second connection resistance R21 first end, resistance R19 first ends connection resistance R18 the
Two ends and resistance R21 first end, the ends of resistance R19 second connect Q4 D poles, and Q4 S poles are grounded, Q4 G poles connecting resistance R30's
First end, resistance R30 the second end ground connection, resistance R27 the second termination Q4 G poles, resistance R27 the first termination capacitor CN1
The 7th pin 2.5V signal voltages, when signal voltage comes, by resistance R27 to Q4D G poles provide conducting voltage, make Q4 complete
Full conducting, being equivalent to resistance R19 the second end, to be directly grounded with resistance R21 be relation in parallel, changes the 1st of chip IC 4
The detection voltage resistance R19 first ends of pin are connected the resistance R of chip IC 5 with the first end at the ends of resistance R18 second and resistance R21
1 pin of pin and chip IC 4, reference voltage detection corresponding to 12V is formed, resistance R15 is connected by the 3rd pin of chip IC 4
First end, the 2nd pin of resistance R15 the 2nd end connection chip IC 1, the 1st pin connection electric capacity C8 of chip IC 1 positive pole, chip
IC1 the 4th pin connection resistance R12 first end, resistance R12 the second end connects the 2nd pin of chip IC 3, the 3rd pin of chip IC 4
The switch on intensity for carrying out control chip IC1 feeds back to the of chip IC 3 optically coupling to the 4th pin of the chip IC 1 of PWM control sections again
2 pin, the output time of control chip IC3 the 6th pin, to control 12V output voltage stabilizations.
The overpower protection funtion part of output protection circuit：PWM control sections resistance R5 first end is S poles phase with Q2
Connection, is connected with resistance R10 the second end, and resistance R10 first end is connected to the 4th pin of chip IC 3, and the first of electric capacity C13
End connection resistance R10 first end and the 4th pin of chip IC 3, resistance R5 the second end are connected to the ground, when 5V unit exceptions or
During person's 12V unit exceptions, cause power output exceed this power supply power output when, power supply will not explode or burn out, and can carry out
Intelligent protection, power up normal work after equipment fault releases.
Excess current protective function part：The ground of resistance R11 first ends connection output, the ends of resistance R11 second connection electric capacity C8
Negative pole, reconnect 4 pin of chip IC 4, connection resistance R17 the first pin, the of resistance R17 crus secunda connection chip IC 4
Five pin, connection resistance R31 the first pin, the ground wire of resistance R31 crus secunda connection output.The pin of chip IC 4 the 3rd connects resistance
R15 first ends, the second end connect IC1B the 2nd pin, form circuit overcurrent protection.
Over-voltage protection function part：Resistance R28 first ends connection electric capacity C8 negative pole, the second end connection resistance R23's
First end, the second end connect Q3 electric capacity C poles, Q3 E poles ground connection, Q3 B poles connecting resistance R26 first end, and the of resistance R26
Two ends are grounded, Q3 B poles connecting resistance R25 first end, resistance R25 the second termination D6 the 2nd pin.
D5 negative terminal connection resistance R28 the second end, D5 positive pole connection resistance R13 first end, the second of resistance R13
End connection D6 the 3rd pin, resistance R13 the second end connection electric capacity C10. resistance R24 first end.Electric capacity C10. resistance R24's
Second end.Resistance R28 the second end connection resistance R22 first end, resistance R22 the second end connection ground.The second of resistance R28
End connection IC5 R pin.Resistance R28 the second end connection electric capacity C6 first end.IC5 A pin connection ground, IC5 K pin connect
Electric capacity C6 the second end is connect, reconnects resistance R16 the second end, resistance R16 first end connects IC2B the 2nd pin, IC2B's
1st pin connection electric capacity C8 positive terminal.
Their embodiment is：
(1) EMI circuits==》(2) AC rectification filter circuit==》(3) voltage conversion circuit==》(4) PWM is controlled
Circuit==》(3) voltage conversion circuit==》(5) rectifying and wave-filtering output circuit==》(6) multivoltage feedback circuit==》
(4) pwm control circuit so do action always.
When power supply occur it is abnormal when flow (1) EMI circuits==》(2) AC rectification filter circuit==》(3) voltage
Translation circuit==》(4) pwm control circuit==》(3) voltage conversion circuit==》(5) rectifying and wave-filtering output circuit==》
(6) output protection circuit==》(4) pwm control circuit closes all circuits, so circulation.
By the way that using EMI circuits are included, ac voltage input mouth, ac rectifier, PWM are controlled in a power
Circuit, voltage conversion circuit, rectifying and wave-filtering output circuit, voltage feedback circuit, the first photoelectric coupled circuit, it is normal in power work
In the case of, it is mobile phone to export as 5V voltages and supply voltage is 5V small household appliances or toy power supply, when for tablet personal computer and power supply
When the small household appliances or toy that voltage is 12V charge, automatic identification simultaneously exports 5V voltage conversion and powered for 12V to equipment.Pass through
Automatic switchover output voltage, solve existing charger unicity, diversification use can not be changed, cause the wasting of resources and environment
The problem of pollution.Meanwhile by the overpower protection of output protection circuit, overcurrent protection, over-voltage protection function, realize
Kind intelligent protection function.
Above-described embodiment and schema and non-limiting product form of the present utility model and style, any art
The appropriate change or modification that those of ordinary skill is done to it, all should be regarded as not departing from patent category of the present utility model.
Claims (7)
- A kind of 1. supply voltage automatic switch-over circuit, it is characterised in that：Including ac voltage input mouth, ac rectifier, Pwm control circuit, voltage conversion circuit, rectifying and wave-filtering output circuit, voltage feedback circuit, the first photoelectric coupled circuit；The ac voltage input mouth, is connected with the input of the ac rectifier, for input ac voltage, and passes Deliver to the ac rectifier；The output end of the ac rectifier, it is connected with the input of the voltage conversion circuit, for by the alternating current Repoussage stream is DC voltage, and is sent to the voltage conversion circuit；The output end of the pwm control circuit, it is connected with the input of the voltage conversion circuit, for exporting PWM switch letters Number, there is provided coupling energy, and it is sent to the voltage conversion circuit；The output end of the voltage conversion circuit, respectively input with the rectifying and wave-filtering output circuit, pwm control circuit Input is connected, for according to the DC voltage and pwm switching signal, output switch power source, being carried for the pwm control circuit Power supply source, and it is sent to the rectifying and wave-filtering output circuit；The output end of the rectifying and wave-filtering output circuit, is connected with the input of the voltage feedback circuit, described for filtering out The ripple of Switching Power Supply, and filtered Switching Power Supply is sent to the voltage feedback circuit；The output end of the voltage feedback circuit, it is connected with the input of first photoelectric coupled circuit, for feeding back the switch Power supply, and it is sent to first photoelectric coupled circuit；The output end of first photoelectric coupled circuit, for isolating the Switching Power Supply, and the Switching Power Supply is sent to described Pwm control circuit, switch control time is provided for the pwm control circuit.
- A kind of 2. supply voltage automatic switch-over circuit according to claim 1, it is characterised in that：It is defeated in the alternating voltage EMI circuits are provided between inbound port and the input of ac rectifier, the electromagnetic interference for filtering out the alternating voltage is believed Number.
- A kind of 3. supply voltage automatic switch-over circuit according to claim 1, it is characterised in that：It is defeated in the rectifying and wave-filtering The output end for going out circuit is provided with output protection circuit, for protecting the Switching Power Supply.
- A kind of 4. supply voltage automatic switch-over circuit according to claim 3, it is characterised in that：The output protection circuit Output end be provided with the second photoelectric coupled circuit, for isolating the Switching Power Supply.
- A kind of 5. supply voltage automatic switch-over circuit according to claim 2, it is characterised in that：The EMI circuits include One fuse, a Y capacitance, a common mode inductance；The first port of the fuse, it is connected with the ac voltage input mouth L；The second port of the fuse, with The first port of the Y capacitance is connected；The second port of the Y capacitance, it is connected with the ac voltage input mouth N；The first port of the common mode inductance, it is connected with the second port of the fuse；The second port of the common mode inductance, It is connected with the ac voltage input mouth N.
- A kind of 6. supply voltage automatic switch-over circuit according to claim 5, it is characterised in that：The ac rectifier Including a bridge rectifier and a high-voltage energy storage capacitor；The first port of the bridge rectifier, it is connected with the 3rd port of the common mode inductance；The of the bridge rectifier Two-port netwerk, it is connected with the 4th port of the common mode inductance；3rd port of the bridge rectifier, with high-voltage energy storage electricity The negative electrode of appearance is connected；4th port of the bridge rectifier, is connected with the anode of the high-voltage energy storage capacitor；The anode of the high-voltage energy storage capacitor, it is connected with the input of the voltage conversion circuit；The high-voltage energy storage capacitor Negative electrode, it is connected with ground signalling.
- A kind of 7. supply voltage automatic switch-over circuit according to claim 3, it is characterised in that：The output protection circuit Including an overpower-protection circuit, a circuit overcurrent protection, an excess voltage protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721052912.9U CN207039475U (en) | 2017-08-22 | 2017-08-22 | A kind of supply voltage automatic switch-over circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721052912.9U CN207039475U (en) | 2017-08-22 | 2017-08-22 | A kind of supply voltage automatic switch-over circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207039475U true CN207039475U (en) | 2018-02-23 |
Family
ID=61488379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721052912.9U Expired - Fee Related CN207039475U (en) | 2017-08-22 | 2017-08-22 | A kind of supply voltage automatic switch-over circuit |
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| Country | Link |
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| CN (1) | CN207039475U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234704A (en) * | 2020-10-12 | 2021-01-15 | 维沃移动通信有限公司 | Flash lamp power supply switching circuit, flash lamp control method and electronic equipment |
| CN114142541A (en) * | 2020-09-04 | 2022-03-04 | 辽宁轨道交通职业学院 | Unmanned helicopter lithium battery isolation charging system based on VICOR power module |
-
2017
- 2017-08-22 CN CN201721052912.9U patent/CN207039475U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142541A (en) * | 2020-09-04 | 2022-03-04 | 辽宁轨道交通职业学院 | Unmanned helicopter lithium battery isolation charging system based on VICOR power module |
| CN112234704A (en) * | 2020-10-12 | 2021-01-15 | 维沃移动通信有限公司 | Flash lamp power supply switching circuit, flash lamp control method and electronic equipment |
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Granted publication date: 20180223 Termination date: 20180822 |