CN106487081A - Mains charger circuit - Google Patents

Mains charger circuit Download PDF

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Publication number
CN106487081A
CN106487081A CN201611188159.6A CN201611188159A CN106487081A CN 106487081 A CN106487081 A CN 106487081A CN 201611188159 A CN201611188159 A CN 201611188159A CN 106487081 A CN106487081 A CN 106487081A
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China
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resistance
pin
circuit
electric capacity
chip
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CN201611188159.6A
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Chinese (zh)
Inventor
吴潮
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Jiangxi Beston Electronics Technology Co Ltd
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Jiangxi Beston Electronics Technology Co Ltd
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Priority to CN201611188159.6A priority Critical patent/CN106487081A/en
Publication of CN106487081A publication Critical patent/CN106487081A/en
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    • H02J7/045

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention discloses mains charger circuit, including current rectifying and wave filtering circuit, transformer, control circuit and circuit of synchronous rectification;Transformer includes main winding, assists winding and auxiliary winding, the input connection electrical network of current rectifying and wave filtering circuit, its output end is connected to the 8th pin of transformer main winding, is provided with the clamp circuit for absorbing the anti-phase interference of transformer between the 8th pin of main winding and the 7th pin;Control circuit includes the first chip, auxiliary rectifier filter circuit, sample circuit and switching frequency control circuit, control circuit is connected to the 4th pin of assists winding, its drain-source end peak voltage for absorbing the first chip internal also by clamp circuit is connected with the 8th pin of main winding, first pin of assists winding is also grounded, the auxiliary winding connection circuit of synchronous rectification of transformer;The structure for solving the presence of existing power charging circuit is complex, and circuit reliability is not high, the poor and problem that relatively consumes energy of circuit linearity, load regulation.

Description

Mains charger circuit
Technical field
The present invention relates to charging circuit field, and in particular to mains charger circuit.
Background technology
Mains charger is a kind of housed device that commonly uses in people's daily life, a lot of families such as mobile phone, computer, electric motor car Electrical appliance can be all used to charger;The pattern of existing charger and had nothing in common with each other using object, but adopt existing charger more Discrete component, the use of a large amount of discrete components cause high processing costs, complex process to cause the repair rate of product higher, in addition electricity Line structure is complex, and circuit reliability is not high, and circuit linearity, load regulation are poor, also compares power consumption.
Content of the invention
It is an object of the invention to provide a kind of mains charger electricity of the high and low-power consumption of low production cost, circuit reliability Road.
The present invention is achieved through the following technical solutions:Mains charger circuit, including the rectification that input is connected with electrical network Filter circuit and the transformer of rectification filter circuit output end connection, the transformer are also respectively connected with control circuit and synchronization Rectification circuit;The transformer includes main winding, assists winding and auxiliary winding, and the control circuit includes the first chip, auxiliary Current rectifying and wave filtering circuit, sample circuit and switching frequency control circuit, the current rectifying and wave filtering circuit include that interconnective bridge-type is whole Stream device and π filter circuit and clamp circuit, the 7th pin of the main winding are connected to a road SW pin of the first chip, One road SW pin of first chip is connected to the 8th pin of main winding also by clamp circuit;The electrical network is through bridge type Rectifier and π filter circuit are connected to the 8th pin of main winding;The FB pin of first chip is connected by sample circuit The 4th pin of assists winding is connected to, the VDD pin of first chip is also connected to auxiliary by auxiliary rectifier filter circuit 4th pin of winding, one end of the CS pin connecting valve frequency control circuit for stating the first chip, the assists winding The first pin and the GND pin of the first chip and the other end of switching frequency control circuit be all grounded, the synchronous rectification Circuit includes the second chip, absorbing circuit, isolation filter circuit, electric source filter circuit, the 17th resistance and the 19th resistance, institute Three GND pin for stating the second chip are all grounded, and the SW pin of second chip is connected to the B pin of auxiliary winding, and described The VCC pin of two chips is also connected with isolation filter circuit, and one end of the isolation filter circuit is connected with the A pin of auxiliary winding, The other end is grounded;The VREF pin of second chip connects one end of the 19th resistance, the other end of the 19th resistance Ground connection, the VDET pin of second chip connect one end of the 17th resistance, the other end auxiliary connection of the 17th resistance The B pin of winding;The B pin of the auxiliary winding is also connected with one end of absorbing circuit, the other end ground connection of the absorbing circuit, institute State one end of the A pin connection electric source filter circuit of auxiliary winding, the other end ground connection of the electric source filter circuit;The transformer It is provided with, between the earth terminal of the GND pin of the first pin earth terminal and the second chip of assists winding, the electrostatic capacitance that disappears;Input The current rectifying and wave filtering circuit being connected with electrical network includes bridge rectifier, and to be connected to bridge-type whole by insuring resistance for the positive pole of the electrical network The input of stream device, the negative pole of the electrical network are connected directly to another input of bridge rectifier;The rectifying and wave-filtering electricity Road also includes π filter circuit, the π filter circuit include the first electric capacity, the second electric capacity, the first inductance, the second inductance, One resistance;Two output end the first electric capacity of parallel connection of the bridge rectifier, an output end of the bridge rectifier also connect One end of the first inductance is connect, the other end of first inductance is additionally coupled to the 8th pin of main winding, the bridge rectifier Another output end be also connected with one end of the second inductance, the other end ground connection of second inductance;The one of second electric capacity End is also connected with the 8th pin of main winding, the other end ground connection of second electric capacity, one end connecting bridge of the first resistor One output end of formula rectifier, the 8th pin of the other end connection main winding of the first resistor;The rectifying and wave-filtering electricity Road also includes the clamp circuit being connected with π filter circuit, the clamp circuit include the first diode, second resistance, the 3rd Resistance, the 3rd electric capacity;The positive pole of first diode is connected to the 7th pin of main winding, the negative pole of first diode Connection 3rd resistor one end, the 3rd resistor the other end connection second resistance one end, the second resistance another One end of the 3rd electric capacity of end connection, the other end of the other end connection 3rd resistor of the 3rd electric capacity, the 3rd electric capacity One end is also connected with the 8th pin of main winding;The auxiliary rectifier filter circuit includes the second diode, the 4th resistance, the 4th electricity Hold;The positive pole of second diode is connected to the 4th pin of assists winding, the negative pole connection the 4th of second diode One end of resistance, the other end of the 4th resistance connect one end of the 4th electric capacity, the other end ground connection of the 4th electric capacity, institute The one end for stating the 4th electric capacity is additionally coupled to the VDD pin of the first chip;The sample circuit include the 5th resistance, the 6th resistance, 7th resistance and the 9th electric capacity, one end of the 5th resistance are connected to the 4th pin of assists winding, the 5th resistance One end is also connected with one end of the 6th resistance, and the other end of the 5th resistance is connected to one end of the 7th resistance, the 6th electricity The other end of resistance is connected to one end of the 9th electric capacity, and the other end of the 9th electric capacity and the 7th resistance is all grounded, and described first The FB pin of chip is connected to the junction of the other end of the 5th resistance and one end of the 7th resistance, the 5th resistance another The junction of one end of end and the 7th resistance is additionally coupled to the junction of one end of the other end and the 9th electric capacity of stating the 6th resistance; The switching frequency control circuit includes the 9th resistance, the 8th resistance and the 22nd resistance, the 9th resistance, the 8th resistance It is connected with the CS pin of the first chip with one end after the 22nd resistance successively parallel connection, the 9th resistance, the 8th resistance and the The other end of 22 resistance is all grounded;The absorbing circuit includes the 16th resistance and the 7th electric capacity, the 7th electric capacity The B pin of one end connection auxiliary winding, the other end of the 7th electric capacity connect one end of the 16th resistance, the 16th resistance The other end connect the GND end of the second chip and be grounded;The isolation filter circuit includes the 8th electric capacity and the 20th resistance, institute The A pin of one end connection auxiliary winding of the 20th resistance is stated, the other end of the 20th resistance connects one end of the 8th electric capacity, The other end ground connection of the 8th electric capacity, the VCC pin of second chip are connected to the other end and the 8th of the 20th resistance The junction of one end of electric capacity;The electric source filter circuit includes the 5th electric capacity, the 6th electric capacity and the 21st resistance, described After five electric capacity, the 6th electric capacity and the 21st resistor coupled in parallel, one end is connected with the A pin of auxiliary winding, five electric capacity, the 6th electricity Hold and the other end of the 21st resistance is all grounded.
The first chip model that the present invention is adopted is PN8386, and the second chip model is APR34309, PN8386 chipset Become super-low standby power consumption quasi-resonance primary controller and the high avalanche capacity intelligent power MOSFET of 650V and OTP overheat protector Device, not only performance is high, and peripheral component is simplified;PN8386 chip be primary side feedback mode of operation, eliminate optocoupler and TL431, and in constant voltage mode, efficiency is improved using quasi-resonance and Multi mode technique and eliminates audio-frequency noise so that system is full 6 grades of Energy Efficiency Standards of foot;PN8368 chip also has extremely comprehensive intelligent protection function, comprising Cycle by Cycle overcurrent protection, overvoltage Protection, open loop protection, overheat protector, output short circuit protection and CS open/short circuit protection;Adjustable output line compensation function can make system Obtain preferable load regulation;In constant current mode, output current and power can be adjusted by the resistance of CS pin;Sampling Circuit detects secondary voltage by assists winding, makes output voltage maintain 5V;When PN8386 chip body temperature is too high, Its built-in OTP defencive function can timely action, close chip, to protect whole system, automatic weight again after temperature drop Open;Which has output short circuit protection, and output overcurrent is protected, and open loop is protected, and the function such as VDD overvoltage protection, to improve whole system Reliability;When sample circuit open circuit or the short circuit of FB pin, system can all enter guard mode;When the short circuit of CS pin it is System can be protected and enter Latch state, to guarantee that system will not be damaged;Current rectifying and wave filtering circuit lifts EMI performance; APR34309 chip is high performance secondary synchronous rectification chip, integrated synchronous rectification MOS, it is adaptable to efficient in charger The demand occasion of rate;APR34309 chip opens judgement and secondary discontinuously pre- decision technology using former limit, effectively can avoid Vibrate, because excitatory, the misoperation for causing;APR34309 chip has distinctive VCC power supply technique, it is ensured that in primary-side-control Under two kinds of working conditions of system constant current and constant voltage, chip is worked all without deficient electricity.
The invention has benefit that:1)Circuit reduction is practical, simple structure, and reliability is improved;2)Improve circuit line Property and load regulation, reducing energy consumption.
Description of the drawings
Fig. 1 is the circuit theory diagrams of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings with specific embodiment, the invention will be further described.
Fig. 1, mains charger circuit, the current rectifying and wave filtering circuit being connected including input and rectifying and wave-filtering electricity is seen with electrical network Transformer T1, the transformer T1 of road output end connection is also respectively connected with control circuit and circuit of synchronous rectification;The transformation Device T1 includes main winding, assists winding and auxiliary winding, the control circuit include the first chip U1, auxiliary rectifier filter circuit, Sample circuit and switching frequency control circuit, the current rectifying and wave filtering circuit include interconnective bridge rectifier BD1 and π filter Wave circuit and clamp circuit, the 7th pin of the main winding are connected to a road SW pin of the first chip U1, and described first The one road SW pin of chip U1 is connected to the 8th pin of main winding also by clamp circuit;The electrical network is through bridge rectifier BD1 and π filter circuit is connected to the 8th pin of main winding;The FB pin of the first chip U1 is connected by sample circuit To the 4th pin of assists winding, the VDD pin of the first chip U1 is also connected to auxiliary by auxiliary rectifier filter circuit 4th pin of winding, one end of the CS pin connecting valve frequency control circuit for stating the first chip U1, the auxiliary around First pin of group and the GND pin of the first chip U1 and the other end of switching frequency control circuit are all grounded, the synchronization Rectification circuit includes the second chip U2, absorbing circuit, isolation filter circuit, electric source filter circuit, the 17th resistance R17 and the tenth Three GND pin of nine resistance R19, the second chip U2 are all grounded, the SW pin of the second chip U2 be connected to secondary around The B pin of group, the VCC pin of the second chip U2 are also connected with isolation filter circuit, one end of the isolation filter circuit with The A pin connection of auxiliary winding, the other end are grounded;The VREF pin of the second chip U2 connects one end of the 19th resistance R19, The other end ground connection of the 19th resistance R19, the VDET pin of the second chip U2 connect the one of the 17th resistance R17 End, the B pin of the other end connection auxiliary winding of the 17th resistance R17;The B pin of the auxiliary winding is also connected with absorbing circuit One end, the absorbing circuit the other end ground connection, the auxiliary winding A pin connection electric source filter circuit one end, described The other end ground connection of electric source filter circuit;First pin earth terminal of the transformer assists winding and the GND of the second chip U2 It is provided with, between the earth terminal of pin, electrostatic capacitance CY1 that disappears;The current rectifying and wave filtering circuit that input is connected with electrical network includes bridge rectifier Device BD1, the positive pole of the electrical network are connected to the input of bridge rectifier BD1, the negative pole of the electrical network by insuring resistance F1 It is connected directly to another input of bridge rectifier BD1;The current rectifying and wave filtering circuit also includes π filter circuit, the π Property filter circuit includes the first electric capacity C1, the second electric capacity C2, the first inductance L1, the second inductance L2, first resistor R1;The bridge-type One output end of two output ends parallel connection the first electric capacity C1, the bridge rectifier BD1 of rectifier BD1 is also connected with the first electricity One end of sense L1, the other end of the first inductance L1 are additionally coupled to the 8th pin of main winding, the bridge rectifier BD1's Another output end is also connected with one end of the second inductance L2, the other end ground connection of the second inductance L2;The second electric capacity C2 One end be also connected with the 8th pin of main winding, the other end of the second electric capacity C2 ground connection, the one of first resistor R1 One output end of end connection bridge rectifier BD1, the 8th pin of the other end connection main winding of first resistor R1;Institute State the clamp circuit that current rectifying and wave filtering circuit also includes to be connected with π filter circuit, the clamp circuit include the first diode D1, Second resistance R2,3rd resistor R3, the 3rd electric capacity C30;The positive pole of the first diode D1 is connected to the 7th of main winding and draws Pin, one end of negative pole connection 3rd resistor R3 of the first diode D1, the other end connection second of 3rd resistor R3 One end of resistance R2, the other end of second resistance R2 connect one end of the 3rd electric capacity C3, and the 3rd electric capacity C3's is another The other end of end connection 3rd resistor R3, one end of the 3rd electric capacity C3 is also connected with the 8th pin of main winding;The auxiliary Current rectifying and wave filtering circuit includes the second diode D2, the 4th resistance R4, the 4th electric capacity C4;The positive pole connection of the second diode D2 To the 4th pin of assists winding, the negative pole of the second diode D2 connects one end of the 4th resistance R4, the 4th resistance The other end of R4 connects one end of the 4th electric capacity C4, and the other end of the 4th electric capacity C4 is grounded, and the one of the 4th electric capacity C4 End is additionally coupled to the VDD pin of the first chip U1;The sample circuit includes the 5th resistance R5, the 6th resistance R6, the 7th resistance One end of R7 and the 9th electric capacity C9, the 5th resistance R5 is connected to the 4th pin of assists winding, the 5th resistance R5's One end is also connected with one end of the 6th resistance R6, and the other end of the 5th resistance R5 is connected to one end of the 7th resistance R7, described The other end of the 6th resistance R6 is connected to one end of the 9th electric capacity C9, and the other end of the 9th electric capacity C9 and the 7th resistance R7 is all Ground connection, the FB pin of the first chip U1 are connected to the connection of the other end of the 5th resistance R5 and one end of the 7th resistance R7 Place, the other end of the 5th resistance R5 are additionally coupled to state the another of the 6th resistance R6 with the junction of one end of the 7th resistance R7 The junction of one end of end and the 9th electric capacity C9;The switching frequency control circuit include the 9th resistance R9, the 8th resistance R8 and 22nd resistance R22, the 9th resistance R9, the 8th resistance R8 and the 22nd resistance R22 one end and the after parallel connection successively The CS pin connection of one chip U1, the 9th resistance R9, the other end of the 8th resistance R8 and the 22nd resistance R22 all connect Ground;The absorbing circuit includes one end connection auxiliary winding of the 16th resistance R16 and the 7th electric capacity C7, the 7th electric capacity C7 B pin, the other end of the 7th electric capacity C7 connect one end of the 16th resistance R16, the other end of the 16th resistance R16 Connect the GND end of the second chip U2 and be grounded;The isolation filter circuit includes the 8th electric capacity C8 and the 20th resistance R20, institute The A pin of one end connection auxiliary winding of the 20th resistance R20 is stated, the other end of the 20th resistance R20 connects the 8th electric capacity One end of C8, the other end ground connection of the 8th electric capacity C8, the VCC pin of the second chip U2 are connected to the 20th resistance The junction of one end of the other end of R20 and the 8th electric capacity C8;The electric source filter circuit includes the 5th electric capacity C5, the 6th electric capacity One end and pair after C6 and the 21st resistance R21, the 5th electric capacity C5, the 6th electric capacity C6 and the 21st resistance R21 parallel connection The A pin connection of winding, the five electric capacity C5, the other end of the 6th electric capacity C6 and the 21st resistance R21 are all grounded.
In present embodiment, 4 SW pins of the first chip U1 are connected to the 7th of main winding after being connected with each other and draw Pin, and also absorbed by the clamp circuit of the first diode D1,3rd resistor R3, second resistance R2, the 3rd electric capacity C3 composition It is connected with each other with the 8th pin of main winding after drain-source end spike voltage inside first chip U1.
In present embodiment, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 are divider resistances;Described 21 resistance R21 are bleeder resistance.
In present embodiment, current rectifying and wave filtering circuit includes bridge rectifier BD1 and π filter circuit;Bridge rectifier Two inputs of BD1 are connected with the electrical network of 220V civil power;π filter circuit include the first electric capacity C1, the first inductance L1, second Inductance L2, the second electric capacity C2 and first resistor R1;First electric capacity C1 is connected with two output ends of bridge rectifier BD1 respectively; One end of first inductance L1 is connected with an output end in bridge rectifier BD1, the 8th pin phase of the other end and main winding Even;One end of second inductance L2 is connected with another output end of bridge rectifier BD1, and the other end is grounded;Second electric capacity C2 mono- End is connected with the 8th pin of main winding, and the other end is grounded;One end of first resistor R1 is defeated with one of bridge rectifier BD1 Go out end to be connected, the other end is connected with the 8th pin of main winding.
In present embodiment, control circuit includes the first chip U1, auxiliary current rectifying and wave filtering circuit, sample circuit and switching frequency Control circuit;4 one tunnels of SW pin of the first chip U1 are connected with the 7th pin of main winding, separately lead up to clamp circuit It is connected with the 8th pin of main winding after absorbing the drain-source end spike voltage inside the first chip U1;The clamp circuit includes One diode D1,3rd resistor R3, second resistance R2, the 3rd electric capacity C3;The positive pole of the first diode D1 and the 4 of the first chip U1 Individual one tunnel of SW pin is connected;The negative pole of the first diode D1 is connected with one end of 3rd resistor R3;The other end of 3rd resistor R3 divides It is not connected with one end of second resistance R2 and one end of the 3rd electric capacity C3 is connected;The other end of second resistance R2 is connected and the 3rd electricity The other end for holding C3 is connected with the 8th pin of main winding respectively;The GND pin ground connection of the first chip U1;The auxiliary rectification filter Wave circuit includes the second diode D2, the 4th resistance R4, the 4th electric capacity C4;The of the positive pole of the second diode D2 and assists winding Four pins are connected;The negative pole of the second diode D2 is connected with one end of the 4th resistance R4;The other end and the 4th of the 4th resistance R4 Electric capacity C4 is connected;The other end ground connection of the 4th electric capacity C4;The VDD pin of the first chip U1 is connected on the 4th of auxiliary current rectifying and wave filtering circuit Between resistance R4 and the 4th electric capacity C4;The sample circuit includes the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 9th Electric capacity C9;One end of 5th resistance R5 and the 6th resistance R6 is connected with the 4th pin of assists winding respectively;5th resistance R5's The other end is connected with one end of the 7th resistance R7;The other end ground connection of the 7th resistance R7;The other end and the 9th of the 6th resistance R6 One end of electric capacity C9 is connected;The other end ground connection of the 9th electric capacity C9;The FB pin of the first chip U1 be connected on the 5th resistance R5, the 6th At partial pressure between after resistance R6 in parallel and the 7th resistance R7, the 9th electric capacity C9 parallel connection;The switching frequency control circuit includes 8th resistance R8, the 9th resistance R9 and the 22nd resistance R22, the CS pin of one end and the first chip U1 after three resistor coupled in parallel It is connected, the other end is grounded;The first pin ground connection of the assists winding.
In present embodiment, the circuit of synchronous rectification includes the second chip U2, absorbing circuit, isolation filter circuit, electricity Power filter;Three GND pin ground connection of the second chip U2;The SW pin of the second chip U2 and the B pin of auxiliary winding It is connected;The isolation filter circuit includes the 20th resistance R20 and the 8th electric capacity C8;One end of 20th resistance R20 with secondary around The A pin of group is connected, and the other end is connected with one end of the 8th electric capacity C8;The other end ground connection of the 8th electric capacity C8;Second chip U2's VCC pin is connected between the 20th resistance R20 and the 8th electric capacity C8;The VREF pin of the second chip U2 and the 19th resistance R19 It is grounded after being connected;The VDET pin of the second chip U2 is connected with the B pin of auxiliary winding after being connected with the 17th resistance R17;Described Absorbing circuit includes the 16th resistance R16 and the 7th electric capacity C7;One end of 7th electric capacity C7 is connected with the B pin of auxiliary winding, another End is connected with one end of the 16th resistance R16;The other end of the 16th resistance R16 is connected with the GND pin of the second chip U2;Described Electric source filter circuit includes the 5th electric capacity C5, the 6th electric capacity C6, the 21st resistance R21;5th electric capacity C5, the 6th electric capacity C6, After 21st resistance R21 parallel connection, one end is connected with the A pin of auxiliary winding, and the other end is grounded;The GND ground connection of the second chip U2 It is provided with, between transformer primary side ground connection, electrostatic capacitance CY1 that disappears.
In present embodiment, the feeder ear of the transformer is former limit, and its ground connection is power supply ground, the output of the transformer End is secondary, output ground during its ground connection.
In present embodiment, the clamp circuit is additionally operable to absorb the reverse interference of transformer T1, prevents power supply to be subject to dry Disturb.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims It is defined, any replacement is readily apparent that by those skilled in the art that this technology is made, deformation, improvement each fall within the present invention's Protection domain.

Claims (10)

1. mains charger circuit, it is characterised in that:The current rectifying and wave filtering circuit being connected with electrical network including input and rectifying and wave-filtering The transformer of circuit output end connection(T1), the transformer(T1)It is also respectively connected with control circuit and circuit of synchronous rectification;Institute State transformer(T1)Including main winding, assists winding and auxiliary winding, the control circuit includes the first chip(U1), auxiliary rectifier Filter circuit, sample circuit and switching frequency control circuit, the current rectifying and wave filtering circuit include interconnective bridge rectifier (BD1)With π filter circuit and clamp circuit, the 7th pin of the main winding is connected to the first chip(U1)A road SW Pin, first chip(U1)A road SW pin be connected to the 8th pin of main winding also by clamp circuit;The electricity Net is through bridge rectifier(BD1)The 8th pin of main winding is connected to π filter circuit;First chip(U1)FB Pin is connected to the 4th pin of assists winding, first chip by sample circuit(U1)VDD pin by aid in whole Stream filter circuit is also connected to the 4th pin of assists winding, described states the first chip(U1)CS pin connecting valve frequency control One end of circuit processed, the first pin of the assists winding and the first chip(U1)GND pin and switching frequency control electricity The other end on road is all grounded, and the circuit of synchronous rectification includes the second chip(U2), absorbing circuit, isolation filter circuit, power supply Filter circuit, the 17th resistance(R17)With the 19th resistance(R19), second chip(U2)Three GND pin all connect Ground, second chip(U2)SW pin be connected to the B pin of auxiliary winding, second chip(U2)VCC pin also connect Isolation filter circuit is connect, one end of the isolation filter circuit is connected with the A pin of auxiliary winding, the other end is grounded;Described second Chip(U2)VREF pin connect the 19th resistance(R19)One end, the 19th resistance(R19)The other end ground connection, Second chip(U2)VDET pin connect the 17th resistance(R17)One end, the 17th resistance(R17)Another The B pin of end connection auxiliary winding;The B pin of the auxiliary winding is also connected with one end of absorbing circuit, the absorbing circuit another End ground connection, one end of the A pin connection electric source filter circuit of the auxiliary winding, the other end ground connection of the electric source filter circuit; First pin earth terminal of the transformer assists winding and the second chip(U2)GND pin earth terminal between be provided with disappear quiet Electric capacity(CY1).
2. mains charger circuit according to claim 1, it is characterised in that:The rectifying and wave-filtering that input is connected with electrical network Circuit includes bridge rectifier(BD1), the positive pole of the electrical network is by insuring resistance(F1)It is connected to bridge rectifier(BD1)'s Input, the negative pole of the electrical network are connected directly to bridge rectifier(BD1)Another input.
3. mains charger circuit according to claim 2, it is characterised in that:The current rectifying and wave filtering circuit also includes π Filter circuit, the π filter circuit include the first electric capacity(C1), the second electric capacity(C2), the first inductance(L1), the second inductance (L2), first resistor(R1);The bridge rectifier(BD1)Two output ends the first electric capacity of parallel connection(C1), the bridge-type is whole Stream device(BD1)An output end be also connected with the first inductance(L1)One end, first inductance(L1)The other end be also connected with To the 8th pin of main winding, the bridge rectifier(BD1)Another output end be also connected with the second inductance(L2)One end, Second inductance(L2)The other end ground connection;Second electric capacity(C2)One end be also connected with the 8th pin of main winding, Second electric capacity(C2)The other end ground connection, the first resistor(R1)One end connection bridge rectifier(BD1)One Output end, the first resistor(R1)The other end connection main winding the 8th pin.
4. mains charger circuit according to claim 3, it is characterised in that:The current rectifying and wave filtering circuit also includes and π Property filter circuit connection clamp circuit, the clamp circuit includes the first diode(D1), second resistance(R2), 3rd resistor (R3), the 3rd electric capacity(C30);First diode(D1)Positive pole be connected to the 7th pin of main winding, the described 1st Pole pipe(D1)Negative pole connection 3rd resistor(R3)One end, the 3rd resistor(R3)The other end connection second resistance(R2) One end, the second resistance(R2)The other end connect the 3rd electric capacity(C3)One end, the 3rd electric capacity(C3)Another End connection 3rd resistor(R3)The other end, the 3rd electric capacity(C3)One end be also connected with the 8th pin of main winding.
5. mains charger circuit according to claim 1, it is characterised in that:The auxiliary rectifier filter circuit includes Two diodes(D2), the 4th resistance(R4), the 4th electric capacity(C4);Second diode(D2)Positive pole be connected to assists winding The 4th pin, second diode(D2)Negative pole connect the 4th resistance(R4)One end, the 4th resistance(R4)'s The other end connects the 4th electric capacity(C4)One end, the 4th electric capacity(C4)The other end ground connection, the 4th electric capacity(C4)'s One end is additionally coupled to the first chip(U1)VDD pin.
6. mains charger circuit according to claim 1, it is characterised in that:The sample circuit includes the 5th resistance (R5), the 6th resistance(R6), the 7th resistance(R7)With the 9th electric capacity(C9), the 5th resistance(R5)One end be connected to auxiliary 4th pin of winding, the 5th resistance(R5)One end be also connected with the 6th resistance(R6)One end, the 5th resistance (R5)The other end be connected to the 7th resistance(R7)One end, the 6th resistance(R6)The other end be connected to the 9th electric capacity (C9)One end, the 9th electric capacity(C9)With the 7th resistance(R7)The other end be all grounded, first chip(U1)FB Pin is connected to the 5th resistance(R5)The other end and the 7th resistance(R7)One end junction, the 5th resistance(R5)'s The other end and the 7th resistance(R7)The junction of one end be additionally coupled to state the 6th resistance(R6)The other end and the 9th electric capacity (C9)One end junction.
7. mains charger circuit according to claim 1, it is characterised in that:The switching frequency control circuit includes Nine resistance(R9), the 8th resistance(R8)With the 22nd resistance(R22), the 9th resistance(R9), the 8th resistance(R8)With 22 resistance(R22)One end and the first chip after parallel connection successively(U1)CS pin connection, the 9th resistance(R9), the 8th Resistance(R8)With the 22nd resistance(R22)The other end be all grounded.
8. mains charger circuit according to claim 1, it is characterised in that:The absorbing circuit includes the 16th resistance (R16)With the 7th electric capacity(C7), the 7th electric capacity(C7)One end connection auxiliary winding B pin, the 7th electric capacity(C7) The other end connect the 16th resistance(R16)One end, the 16th resistance(R16)The other end connect the second chip(U2) GND end and be grounded.
9. mains charger circuit according to claim 1, it is characterised in that:The isolation filter circuit includes the 8th electricity Hold(C8)With the 20th resistance(R20), the 20th resistance(R20)One end connection auxiliary winding A pin, the described 20th Resistance(R20)The other end connect the 8th electric capacity(C8)One end, the 8th electric capacity(C8)The other end ground connection, described second Chip(U2)VCC pin be connected to the 20th resistance(R20)The other end and the 8th electric capacity(C8)One end junction.
10. mains charger circuit according to claim 1, it is characterised in that:The electric source filter circuit includes the 5th Electric capacity(C5), the 6th electric capacity(C6)With the 21st resistance(R21), the 5th electric capacity(C5), the 6th electric capacity(C6)With second 11 resistance(R21)After parallel connection, one end is connected with the A pin of auxiliary winding, five electric capacity(C5), the 6th electric capacity(C6)With second 11 resistance(R21)The other end be all grounded.
CN201611188159.6A 2016-12-21 2016-12-21 Mains charger circuit Pending CN106487081A (en)

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Publication number Priority date Publication date Assignee Title
CN106953211A (en) * 2017-05-05 2017-07-14 南京普天鸿雁电器科技有限公司 Elongation line socket
CN114390755A (en) * 2021-12-28 2022-04-22 江门市千彩智能科技有限公司 Remote control system with touch switch and front and back sticking lamps and control box

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CN203912287U (en) * 2014-06-24 2014-10-29 深圳市众明半导体照明有限公司 Led driving power supply
CN206775206U (en) * 2016-12-21 2017-12-19 江西佰仕通电子科技有限公司 Mains charger circuit

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Publication number Priority date Publication date Assignee Title
CN101510103A (en) * 2008-10-24 2009-08-19 深圳创维-Rgb电子有限公司 Secondary voltage relief switch stable voltage power source
CN101867214A (en) * 2010-06-24 2010-10-20 深圳市瑞必达电源有限公司 Charging circuit and charger
CN202068337U (en) * 2011-02-21 2011-12-07 上海博湃电子科技有限公司 Auxiliary power supply for three-phase intelligent ammeter
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Publication number Priority date Publication date Assignee Title
CN106953211A (en) * 2017-05-05 2017-07-14 南京普天鸿雁电器科技有限公司 Elongation line socket
CN106953211B (en) * 2017-05-05 2022-11-01 南京普天鸿雁电器科技有限公司 Extended line socket
CN114390755A (en) * 2021-12-28 2022-04-22 江门市千彩智能科技有限公司 Remote control system with touch switch and front and back sticking lamps and control box

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