CN204190637U - A kind of power adapter circuit - Google Patents
A kind of power adapter circuit Download PDFInfo
- Publication number
- CN204190637U CN204190637U CN201420506863.1U CN201420506863U CN204190637U CN 204190637 U CN204190637 U CN 204190637U CN 201420506863 U CN201420506863 U CN 201420506863U CN 204190637 U CN204190637 U CN 204190637U
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- current rectifying
- transformer
- wave filtering
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Abstract
The utility model discloses a kind of power adapter circuit, comprise ac input end, EMI circuit, the first current rectifying and wave filtering circuit, transformer, feedback circuit and pwm chip, primary coil one end of transformer is connected with the output of the first current rectifying and wave filtering circuit, the other end is connected to the drain electrode of a metal-oxide-semiconductor, secondary coil is connected to a DC output end by one second current rectifying and wave filtering circuit, and feedback coil is connected to one the 3rd current rectifying and wave filtering circuit; Feedback circuit comprises photoelectrical coupler, reference voltage stabilizing source and is connected to the voltage sample circuit of described DC output end, pwm chip, comprise GND pin, VDD pin, COM pin, CS pin and DRV pin, VDD pin is connected to the output of the first current rectifying and wave filtering circuit by a starting resistance, and this VDD pin is connected with the 3rd current rectifying and wave filtering circuit, COM pin is connected with the collector electrode of the phototriode of photoelectrical coupler, CS pin is by a sample resistance ground connection, and DRV pin is connected with the grid of metal-oxide-semiconductor.The features such as the utility model has low in energy consumption, and noise is little.
Description
Technical field
The utility model relates to power-supply device, particularly relates to a kind of power adapter circuit.
Background technology
Power supply adaptor (Power adapter) is the power supply conversion equipment of small portable electronic device and electronic apparatus, is generally made up of shell, power transformer and rectification circuit etc.When current power supply adaptor works, starting current is comparatively large, and power consumption time standby is high, and audio-frequency noise is large, and output voltage is unstable, and overall performance is poor.
Utility model content
The purpose of this utility model is overcome deficiency of the prior art and provide a kind of power adapter circuit, has low in energy consumption, the features such as noise is little.
The technical scheme that the utility model solution prior art problem adopts is: a kind of power adapter circuit, comprising:
Ac input end, in order to input ac voltage;
EMI circuit, is connected with described ac input end, in order to described alternating voltage filtering electromagnetic interference;
First current rectifying and wave filtering circuit, is connected with described EMI circuit, and the alternating voltage for exporting described EMI circuit carries out rectifying and wave-filtering and forms direct voltage;
Transformer, primary coil one end of described transformer is connected with the output of described first current rectifying and wave filtering circuit, and the other end is connected to the drain electrode of a metal-oxide-semiconductor; The secondary coil of described transformer is connected to a DC output end by one second current rectifying and wave filtering circuit; The feedback coil of described transformer is connected to one the 3rd current rectifying and wave filtering circuit;
Feedback circuit, comprise photoelectrical coupler, reference voltage stabilizing source and be connected to the voltage sample circuit of described DC output end, the positive pole of the light-emitting component of described photoelectrical coupler is connected to the secondary coil of described transformer by a supplying resistance, the negative pole of described light-emitting component is connected with the negative electrode of described reference voltage stabilizing source, the reference pole of described reference voltage stabilizing source is connected to described voltage sample circuit, the plus earth of described reference voltage stabilizing source;
Pwm chip, comprise GND pin, VDD pin, COM pin, CS pin and DRV pin, wherein, described GND pin ground connection, described VDD pin is connected to the output of the first current rectifying and wave filtering circuit by a starting resistance, and this VDD pin is connected with described 3rd current rectifying and wave filtering circuit, described COM pin is connected with the collector electrode of the phototriode of described photoelectrical coupler, the grounded emitter of described phototriode, described CS pin is by a sample resistance ground connection, described DRV pin is connected with the grid of described metal-oxide-semiconductor, the source electrode of described metal-oxide-semiconductor is by described sample resistance ground connection.
Preferably, described pwm chip also comprises OTP pin, and described OTP pin is by a thermistor ground connection.
Preferably, also comprise peak absorbing circuit, between the two ends being connected to the primary coil of described transformer of described peak absorbing circuit, the peak voltage that the primary coil in order to absorb described transformer produces.
Preferably, described voltage sample circuit comprises pull-up resistor and pull down resistor, and one end of described pull-up resistor is connected with described DC output end, and the other end is connected with one end of described pull down resistor, the other end ground connection of described pull down resistor.
Preferably, described feedback circuit also comprises an a reference source loop compensation circuit, and one end of described a reference source loop compensation circuit is connected to the connected node of described pull-up resistor and pull down resistor, and the other end is connected to the negative electrode of described reference voltage stabilizing source.
Preferably, described peak absorbing circuit comprises the second resistance, the 3rd electric capacity and the 6th diode, one end of described second resistance and the 3rd electric capacity connects one end of the primary coil of described transformer, the other end of described second resistance and the 3rd electric capacity connects the negative electrode of described 6th diode, and the anode of described 6th diode connects the other end of the primary coil of described transformer.
Preferably, described a reference source loop compensation circuit comprises the 5th resistance and the 5th electric capacity, one end of described 5th resistance is connected to the connected node of described pull-up resistor and pull down resistor, the other end connects described 5th electric capacity one end, and the other end of described 5th electric capacity is connected to the negative electrode of described reference voltage stabilizing source.
Preferably, described pwm chip is M5573 family chip.
Power adapter circuit of the present utility model, feedback circuit is utilized to feed back to pwm chip from DC output end detection signal, the duty ratio of output waveform is being controlled by pwm chip, reach the object of regulation output voltage, have low in energy consumption, the features such as starting current is little, output voltage stabilization, its performance is good.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment;
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Below with reference to drawings and the specific embodiments describe in detail the technical solution of the utility model so as clearer, understand invention essence of the present utility model intuitively.
With reference to shown in Fig. 1, the utility model embodiment provides a kind of power adapter circuit, for providing stable operating voltage for electronic equipment, this power adapter circuit specifically comprises ac input end, EMI circuit 10, first current rectifying and wave filtering circuit 20, transformer T1, feedback circuit 50 and pwm chip U1.
Concrete, ac input end is generally connected with mains supply, in order to input ac voltage such as 85-264V Width funtion.EMI circuit 10 is connected with ac input end, in order to alternating voltage filtering electromagnetic interference.First current rectifying and wave filtering circuit 20 is connected with EMI circuit 10, and the alternating voltage for exporting EMI circuit 10 carries out rectifying and wave-filtering and forms direct voltage.Primary coil L1 one end of transformer T1 is connected with the output of the first current rectifying and wave filtering circuit 20, and the other end is connected to the drain electrode of a metal-oxide-semiconductor Q1; The secondary coil L2 of transformer T1 is connected to a DC output end by one second current rectifying and wave filtering circuit 30; The feedback coil L3 of transformer T1 is connected to one the 3rd current rectifying and wave filtering circuit 40.
Feedback circuit 50 comprises photoelectrical coupler, reference voltage stabilizing source 501 and is connected to the voltage sample circuit 502 of DC output end, the positive pole of the light-emitting component 504 of photoelectrical coupler is connected to the secondary coil L2 of transformer T1 by a supplying resistance R3, the negative pole of light-emitting component 504 is connected with the negative electrode of reference voltage stabilizing source 501, the reference pole of reference voltage stabilizing source 501 is connected to voltage sample circuit 502, the plus earth of reference voltage stabilizing source 501.
Pwm chip U1, comprise GND pin, VDD pin, COM pin, CS pin and DRV pin, wherein, GND pin ground connection, VDD pin is connected to the output of the first current rectifying and wave filtering circuit 20 by a starting resistance R1, and this VDD pin is connected with the 3rd current rectifying and wave filtering circuit 40, COM pin is connected with the collector electrode of the phototriode Q2 of photoelectrical coupler, the grounded emitter of phototriode Q2, CS pin is by a sample resistance R8 ground connection, DRV pin is connected with the grid of metal-oxide-semiconductor Q1, and the source electrode of metal-oxide-semiconductor Q1 is by sample resistance R8 ground connection.Pwm chip U1 can adopt model to be on the market the family chip of M5573.
The alternating voltage of ac input end input, carry out anti-interference process by EMI circuit 10, the alternating voltage after process inputs to the first current rectifying and wave filtering circuit 20, carries out rectifying and wave-filtering form direct voltage by the first current rectifying and wave filtering circuit 20.And the VDD pin of pwm chip U1 provides the immediate current voltage of work by starting resistance R1 and starts work, by DRV pin output switch Waveform Control metal-oxide-semiconductor Q1 conducting, circuit triggers works, transformer T1 changes the direct voltage that the first current rectifying and wave filtering circuit 20 exports, form the direct voltage of low pressure at the output of secondary coil L2, this direct voltage carries out rectifying and wave-filtering and exportable DC output end is power electronic equipment etc. through the second current rectifying and wave filtering circuit 30 again.In the process, feedback coil L3 induces induced voltage, and this induced voltage inputs to VDD pin for pwm chip U1 after carrying out rectifying and wave-filtering by the 3rd current rectifying and wave filtering circuit 40 provide the operating voltage of continuous firing.Simultaneously, voltage sampling is carried out by voltage sample circuit 502 at DC output end, sampling voltage is input in reference voltage stabilizing source 501 and compares with reference voltage, information of voltage is relatively coupled to the COM pin of pwm chip U1 by photoelectrical coupler, meanwhile, the CS pin of pwm chip U1 obtains a magnitude of voltage by sample resistance R8, this magnitude of voltage and above-mentioned information of voltage together input in pwm chip U1 and carry out computing controls output waveform duty ratio eventually through DRV pin, thus reach the object of adjustment output voltage.
In an embodiment of the present utility model, pwm chip U1 also comprises OTP pin, and OTP pin is by a thermistor RT ground connection.This thermistor RT responds to the temperature of metal-oxide-semiconductor Q1; signal of telecommunication temperature signal being converted to correspondence inputs in pwm chip U1 and compares with setting threshold values; when temperature is higher than setting threshold values, controls metal-oxide-semiconductor Q1 by DRV pin and disconnect, thus reach the object of overheat protector.
In preferred embodiment of the present utility model; also comprise peak absorbing circuit 50; between the two ends of primary coil L1 being connected to transformer T1 of peak absorbing circuit 50, the peak voltage that the primary coil L1 in order to absorb transformer T1 produces, to realize the protection to transformer T1.
Or with reference to shown in Fig. 1, in a specific embodiment of the present utility model, first current rectifying and wave filtering circuit 20 comprises the rectifier bridge and filter capacitor C1 that are made up of the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, alternating voltage is after EMI circuit 10 carries out anti-interference process, again through rectifier bridge rectification, carry out filtering finally by filter capacitor C1 and finally form direct voltage.
Second current rectifying and wave filtering circuit 30 comprises rectifier diode D7 and filter capacitor C4, rectifier diode D7 carries out rectification to the direct voltage that the secondary coil L2 of transformer T1 exports, and the direct voltage that the direct voltage after rectification carries out filtering formation low pressure through filter capacitor C4 is again exported by DC output end.
3rd current rectifying and wave filtering circuit 40 comprises rectifier diode D5 and filter capacitor C2, the induced voltage that feedback coil L3 induces is through rectifier diode D5 rectification, electric capacity C2 carries out filtering after filtering again, finally can input in VDD pin as pwm chip U1 provides the operating voltage of continuous firing.
Voltage sample circuit 502 comprises pull-up resistor R4 and pull down resistor R7, and one end of pull-up resistor R4 is connected with DC output end, and the other end is connected with one end of pull down resistor R7, the other end ground connection of pull down resistor R7.Carry out dividing potential drop by pull-up resistor R4 and pull down resistor R7, then take out a sampling voltage from the connected node of pull-up resistor R4 and pull down resistor R7 and be fed through in reference voltage stabilizing source 501 and compare with reference voltage (being generally 2.5V).
Feedback circuit 50 also comprises an a reference source loop compensation circuit 503, and one end of a reference source loop compensation circuit 503 is connected to the connected node of pull-up resistor R4 and pull down resistor R7, and the other end is connected to the negative electrode of reference voltage stabilizing source 501.Concrete, this a reference source loop compensation circuit 503 comprises the 5th resistance R5 and the 5th electric capacity C5, one end of 5th resistance R5 is connected to the connected node of pull-up resistor R4 and pull down resistor R7, the other end connects the 5th electric capacity C5 one end, and the other end of the 5th electric capacity C5 is connected to the negative electrode of reference voltage stabilizing source 501.By the 5th resistance 5 and the 5th electric capacity C5, loop compensation is carried out to reference voltage stabilizing source 501.
Peak absorbing circuit 60 comprises the second resistance R2, the 3rd electric capacity C3 and the 6th diode D6, one end of the primary coil L1 of one end connection transformer T1 of the second resistance R2 and the 3rd electric capacity C3, the other end of the second resistance R2 and the 3rd electric capacity C3 connects the negative electrode of the 6th diode D6, the other end of the primary coil L1 of the anode connection transformer T1 of the 6th diode D6.
Power adapter circuit of the present utility model, feedback circuit 50 is utilized to feed back to pwm chip U1 from DC output end detection signal, the duty ratio of output waveform is being controlled by pwm chip U1, reach the object of regulation output voltage, have low in energy consumption, the features such as starting current is little, output voltage stabilization, its performance is good.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (8)
1. a power adapter circuit, is characterized in that, comprising:
Ac input end, in order to input ac voltage;
EMI circuit, is connected with described ac input end, in order to described alternating voltage filtering electromagnetic interference;
First current rectifying and wave filtering circuit, is connected with described EMI circuit, and the alternating voltage for exporting described EMI circuit carries out rectifying and wave-filtering and forms direct voltage;
Transformer, primary coil one end of described transformer is connected with the output of described first current rectifying and wave filtering circuit, and the other end is connected to the drain electrode of a metal-oxide-semiconductor; The secondary coil of described transformer is connected to a DC output end by one second current rectifying and wave filtering circuit; The feedback coil of described transformer is connected to one the 3rd current rectifying and wave filtering circuit;
Feedback circuit, comprise photoelectrical coupler, reference voltage stabilizing source and be connected to the voltage sample circuit of described DC output end, the positive pole of the light-emitting component of described photoelectrical coupler is connected to the secondary coil of described transformer by a supplying resistance, the negative pole of described light-emitting component is connected with the negative electrode of described reference voltage stabilizing source, the reference pole of described reference voltage stabilizing source is connected to described voltage sample circuit, the plus earth of described reference voltage stabilizing source;
Pwm chip, comprise GND pin, VDD pin, COM pin, CS pin and DRV pin, wherein, described GND pin ground connection, described VDD pin is connected to the output of the first current rectifying and wave filtering circuit by a starting resistance, and this VDD pin is connected with described 3rd current rectifying and wave filtering circuit, described COM pin is connected with the collector electrode of the phototriode of described photoelectrical coupler, the grounded emitter of described phototriode, described CS pin is by a sample resistance ground connection, described DRV pin is connected with the grid of described metal-oxide-semiconductor, the source electrode of described metal-oxide-semiconductor is by described sample resistance ground connection.
2. power adapter circuit according to claim 1, is characterized in that, described pwm chip also comprises OTP pin, and described OTP pin is by a thermistor ground connection.
3. power adapter circuit according to claim 1, it is characterized in that, also comprise peak absorbing circuit, between the two ends being connected to the primary coil of described transformer of described peak absorbing circuit, the peak voltage that the primary coil in order to absorb described transformer produces.
4. power adapter circuit according to claim 1, it is characterized in that, described voltage sample circuit comprises pull-up resistor and pull down resistor, one end of described pull-up resistor is connected with described DC output end, the other end is connected with one end of described pull down resistor, the other end ground connection of described pull down resistor.
5. power adapter circuit according to claim 4, it is characterized in that, described feedback circuit also comprises an a reference source loop compensation circuit, one end of described a reference source loop compensation circuit is connected to the connected node of described pull-up resistor and pull down resistor, and the other end is connected to the negative electrode of described reference voltage stabilizing source.
6. power adapter circuit according to claim 3, it is characterized in that, described peak absorbing circuit comprises the second resistance, the 3rd electric capacity and the 6th diode, one end of described second resistance and the 3rd electric capacity connects one end of the primary coil of described transformer, the other end of described second resistance and the 3rd electric capacity connects the negative electrode of described 6th diode, and the anode of described 6th diode connects the other end of the primary coil of described transformer.
7. power adapter circuit according to claim 5, it is characterized in that, described a reference source loop compensation circuit comprises the 5th resistance and the 5th electric capacity, one end of described 5th resistance is connected to the connected node of described pull-up resistor and pull down resistor, the other end connects described 5th electric capacity one end, and the other end of described 5th electric capacity is connected to the negative electrode of described reference voltage stabilizing source.
8. power adapter circuit according to any one of claim 1 to 7, is characterized in that, described pwm chip is M5573 family chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420506863.1U CN204190637U (en) | 2014-09-03 | 2014-09-03 | A kind of power adapter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420506863.1U CN204190637U (en) | 2014-09-03 | 2014-09-03 | A kind of power adapter circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204190637U true CN204190637U (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420506863.1U Expired - Fee Related CN204190637U (en) | 2014-09-03 | 2014-09-03 | A kind of power adapter circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490514A (en) * | 2016-02-24 | 2016-04-13 | 航天长峰朝阳电源有限公司 | Secondary power supply anti-start-voltage-overshoot circuit |
| CN105889859A (en) * | 2015-10-02 | 2016-08-24 | 蒋超 | LED rod type lighting device capable of being charged by solar energy and wind energy day and night |
| CN109274252A (en) * | 2018-09-03 | 2019-01-25 | 杭州中恒电气股份有限公司 | A kind of follow-on Switching Power Supply loop compensation circuit |
| CN111414032A (en) * | 2019-01-04 | 2020-07-14 | 华润微电子（重庆）有限公司 | Voltage regulating circuit |
| CN114374323A (en) * | 2020-10-15 | 2022-04-19 | 深圳市英维克信息技术有限公司 | Isolated power supply circuit and electronic equipment |
| CN115395794A (en) * | 2022-10-27 | 2022-11-25 | 中科(深圳)无线半导体有限公司 | Power adapter circuit |
-
2014
- 2014-09-03 CN CN201420506863.1U patent/CN204190637U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105889859A (en) * | 2015-10-02 | 2016-08-24 | 蒋超 | LED rod type lighting device capable of being charged by solar energy and wind energy day and night |
| CN105490514A (en) * | 2016-02-24 | 2016-04-13 | 航天长峰朝阳电源有限公司 | Secondary power supply anti-start-voltage-overshoot circuit |
| CN109274252A (en) * | 2018-09-03 | 2019-01-25 | 杭州中恒电气股份有限公司 | A kind of follow-on Switching Power Supply loop compensation circuit |
| CN111414032A (en) * | 2019-01-04 | 2020-07-14 | 华润微电子（重庆）有限公司 | Voltage regulating circuit |
| CN114374323A (en) * | 2020-10-15 | 2022-04-19 | 深圳市英维克信息技术有限公司 | Isolated power supply circuit and electronic equipment |
| CN115395794A (en) * | 2022-10-27 | 2022-11-25 | 中科(深圳)无线半导体有限公司 | Power adapter circuit |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20210903 |
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| CF01 | Termination of patent right due to non-payment of annual fee |