CN209913557U

CN209913557U - Switch power supply charging circuit capable of intelligently outputting

Info

Publication number: CN209913557U
Application number: CN201920751192.8U
Authority: CN
Inventors: 张传华
Original assignee: Shenzhen Ying Hui Electronics Co Ltd
Current assignee: Shenzhen Ying Hui Electronics Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-01-07
Anticipated expiration: 2029-05-23

Abstract

The utility model discloses a but switching power supply charging circuit of intelligence output, this charging circuit include EMI circuit, rectifier filter circuit, high-pressure starting circuit, peak absorption circuit, high frequency transformer, pulse width control return circuit, auxiliary winding rectifier filter circuit, output feedback loop, fill recognition circuit and secondary EMI circuit soon. The utility model discloses a circuit is simplified, whole small, with low costs, and fourth diode D4 replaces traditional schottky, can guarantee the security of circuit and improve output efficiency, reduces the complete machine temperature simultaneously. Furthermore, the utility model discloses a charging circuit is for filling the output soon, and compatible multiple direct current output can support multiple product simultaneously, and under the different condition of single style product battery electric quantity, can pass through the communication between equipment and the charger, confirms the most suitable power output specification under, can realize quick charge, can prolong battery life again.

Description

Switch power supply charging circuit capable of intelligently outputting

[ technical field ] A method for producing a semiconductor device

The utility model relates to a charging circuit especially relates to a but switching power supply charging circuit of intelligent output that can export different specifications according to load type.

[ background of the invention ]

The output of the conventional charging circuit of the switching power supply is of a single dc output specification, such as 5V1A/5V2A, but in the practical application process, a user may need to charge products of different output specifications, and the charging power supply of the single dc output specification cannot meet the purpose of charging products of various forms. On the other hand, for a single product, under the condition of different electric quantities, the charging requirements are different, and the power output specification cannot be changed according to the different electric quantities by using the existing charging power supply, so that efficient charging cannot be realized. In addition, the existing switching power supply charging circuit has the defects of large volume, low efficiency, high temperature and the like.

[ Utility model ] content

The utility model aims to solve the above problem, and provide a but switch power supply charging circuit of intelligent output that can export different specifications, small in size, with low costs and accord with EU six grades of efficiency requirements according to load type.

The utility model discloses a switch power supply charging circuit capable of intelligent output, which comprises an EMI circuit connected with the commercial power input, a rectifying filter circuit connected with the output end of the EMI circuit, a high-voltage starting circuit connected with the output end of the rectifying filter circuit, a peak absorption circuit connected with the output end of the rectifying filter circuit, a high-frequency transformer connected with the output end of the peak absorption circuit, a pulse width control loop respectively connected with the output end of the high-voltage starting circuit and the output end of the peak absorption circuit, an auxiliary winding rectifying filter circuit respectively connected with the output end of the high-frequency transformer and one input end of the pulse width control loop, an output winding rectifying filter circuit connected with the output end of the high-frequency transformer, an output feedback loop connected with one input end of the pulse width control loop, a quick identification circuit connected with a load and a secondary EMI circuit arranged between the auxiliary winding and the output winding of the, and the output end of the output winding rectifying and filtering circuit is connected with a load and supplies power to the load.

The EMI circuit includes first protective tube F1 and first common mode inductance LF1, the one end of first protective tube F1 is connected with the live wire of commercial power input, and its other end is connected with an input end of first common mode inductance LF1, another input end of first common mode inductance LF1 is connected with the zero line of commercial power input.

The rectifying and filtering circuit comprises a first rectifying bridge BD1, a first capacitor C1, a second capacitor C2, a first resistor R1 and a first inductor L1, wherein the input end of the first rectifying bridge BD1 is connected with the output end of the EMI circuit 10, the positive output end of the first rectifying bridge BD1 is connected with the positive electrode of the first capacitor C1, one end of the first resistor R1 and the input end of the first inductor L1, the other end of the first resistor R1 and the output end of the first inductor L1 are respectively connected with the positive electrode of the second capacitor C2, and the negative output end of the first rectifying bridge BD1, the negative electrode of the first capacitor C1 and the negative electrode of the second capacitor C2 are respectively grounded.

The high-voltage starting circuit comprises a second resistor R2 and a third resistor R3, one end of the second resistor R2 is connected with the output end of the rectifying and filtering circuit, and the other end of the second resistor R2 is connected with the pulse width control loop.

The peak absorption circuit comprises a third capacitor C3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first diode D1, the high-frequency transformer is a first transformer T1, the third capacitor C3 is connected in parallel with the fourth resistor R4 and the fifth resistor R5, one end of the third capacitor C3 is connected with the output end of the rectifying and filtering circuit and the different name end of the input winding of the first transformer T1, the other end of the third capacitor C3 is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the different name end of the input winding of the first transformer T1, the secondary EMI circuit is a first Y capacitor CY1, one end of the first Y capacitor CY1 is connected with the different name end of the output winding of the first transformer T1, and the other end of the first capacitor T1 is connected with the different name end of the auxiliary winding of the first transformer T1.

The pulse width control loop comprises a first chip U1, a fifth capacitor C5, a sixth diode D6, a tenth resistor R10 and an eleventh resistor R11, wherein the model of the first chip U1 is SP6648HF, a VDD pin of the first chip U1 is respectively connected with a high-voltage starting circuit and an auxiliary winding rectifying and filtering circuit, an FB pin of the first chip U1 is respectively connected with a cathode of the sixth diode D6, one end of the fifth capacitor C5 and an output end of an output feedback loop (90), a CS pin of the first chip U1 is respectively connected with one end of the tenth resistor R10 and one end of the eleventh resistor R11, a DRAIN pin of the first chip U1 is connected with a high-frequency transformer, and an anode of the sixth diode D6, the other end of the fifth capacitor C5, the other end of the tenth resistor R10 and the other end of the eleventh resistor R11 are grounded.

The auxiliary winding rectifying and filtering circuit comprises a second diode D2, a seventh resistor R7 and a twelfth capacitor C12, the anode of the second diode D2 is connected with the high-frequency transformer, the cathode of the second diode D2 is connected with one end of a seventh resistor R7, the other end of the seventh resistor R7 and the anode of the twelfth capacitor C12 are connected with the pulse width control loop, the cathode of the twelfth capacitor C12 is grounded, the output winding rectifying and filtering circuit comprises a twelfth resistor R12, a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8 and a ninth capacitor C9, the model of the fourth diode D4 is DK5V85R15S, the anode of the fourth diode D4 and one end of the twelfth resistor R12 are respectively connected with the high-frequency transformer, the cathode of the fourth diode D4 is respectively connected with the anode of the eighth capacitor C8, the seventh capacitor C7, the anode of the ninth capacitor C9 and one end of the twelfth capacitor C12, and the other end of the twelfth capacitor C7 are connected with the eighth capacitor C7, and the cathode of the eighth capacitor C8 and the cathode of the ninth capacitor C9 are connected with the cathode of the output voltage.

The output feedback loop comprises a second chip U4, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eleventh capacitor C11 and a third chip U3, wherein the anode of the second chip U4 is respectively connected with one end of a sixteenth resistor R16 and one end of a seventeenth resistor R17, the cathode of the second chip U4 is respectively connected with the cathode of the third chip U3, one end of a fifteenth resistor R15 and the other end of the seventeenth resistor R17, the collector of the second chip U4 is connected with a pulse width control loop, the other end of the sixteenth resistor R16 and one end of the thirteenth resistor R13 are respectively connected with an output winding rectifying and filtering circuit, the reference pole of the third chip U3 is respectively connected with one end of an eleventh capacitor C11, one end of a fourteenth resistor R14, the other end of the thirteenth resistor R13 and a quick charge identification circuit, the other end of the fifteenth resistor R15 is connected to the other end of the eleventh capacitor C11, and the anode of the third chip U3 and the other end of the fourteenth resistor R14 are grounded.

The fast charging identification circuit comprises a second chip U2, a nineteenth resistor R19 and a tenth capacitor C10, an FBO pin of the second chip U2 is connected with an output feedback loop, a D + pin of the second chip U2 is connected with a D + pin of the charging equipment, a D-pin of the second chip U2 is connected with a D-pin of the charging equipment, a VDD pin of the second chip U2 is connected with an EN pin of the second chip U2, one end of the tenth capacitor C10 and one end of the nineteenth resistor R19 respectively, the other end of the nineteenth resistor R19 is connected with the positive pole of the output voltage, and the other end of the tenth capacitor C10 is connected with the negative pole of the output voltage.

The commercial power input voltage is 90-264V alternating current, and the output voltage of the output end of the output winding rectifying and filtering circuit is 5V/3.0A, 9V/2.0A and 12V/1.5A direct current.

The utility model has the advantages that: the utility model discloses a but the model of first chip U1 in intelligent output's switching power supply charging circuit's the pulse width control return circuit is SP6648HF, fourth diode D4's among the auxiliary winding rectification filter circuit model is DK5V85R15S, because first chip U1 and fourth diode D4 all built-in MOS pipe, make the circuit simplify, whole small, with low costs, and fourth diode D4 replaces traditional schottky, can guarantee the security of circuit and improve output efficiency, reduce the complete machine temperature simultaneously. Furthermore, the utility model discloses a charging circuit is for filling the output soon, and compatible 5V 3.0A, 9V 2.0A, 12V 1.5A direct current output can support multiple product simultaneously, and under the different condition of single style product battery electric quantity, can pass through the communication between equipment and the charger, confirms the most suitable power output specification under, can realize quick charge, can prolong battery life again.

[ description of the drawings ]

Fig. 1 is a schematic block diagram of the present invention.

Fig. 2 is a schematic circuit diagram of the present invention.

[ detailed description ] embodiments

The following examples are further to explain and supplement the present invention, and do not constitute any limitation to the present invention.

As shown in FIG. 1, the charging circuit of the present invention can convert the AC 85 Vac-265 Vac into 5Vdc/3A, 9Vdc/2A, 12V/1.5A DC output, and simultaneously support various products, and can determine the current power output specification through the communication between the mobile phone and the charger under the condition of different battery capacities of the single-style product, thereby realizing the quick charging of the mobile phone and prolonging the service life of the battery. The charging circuit comprises an EMI circuit 10, a rectifying and filtering circuit 20, a high-voltage starting circuit 30, a peak absorption circuit 40, a high-frequency transformer 50, a pulse width control loop 60, an auxiliary winding rectifying and filtering circuit 70, an output winding rectifying and filtering circuit 80, an output feedback loop 90, a quick charging identification circuit 100 and a secondary EMI circuit 110.

As shown in fig. 1 and fig. 2, the input terminal of the EMI circuit 10 is connected to the commercial power input, the output terminal thereof is connected to the input terminal of the rectification filter circuit 20, the output terminal of the rectification filter circuit 20 is connected to the input terminal of the high-voltage start circuit 30 and the input terminal of the spike absorption circuit 40, the output terminal of the high-voltage start circuit 30 is connected to the first input terminal of the pulse width control circuit 60, the output terminal of the spike absorption circuit 40 is connected to the input winding of the high-frequency transformer 50 and the output terminal of the pulse width control circuit 60, the auxiliary winding of the high-frequency transformer 50 is connected to the input terminal of the auxiliary winding rectification filter circuit 70, the output winding of the high-frequency transformer 50 is connected to the input terminal of the output winding rectification filter circuit 80, the first input terminal of the pulse width control circuit 60 is connected to the output terminal of the, the third input end is connected with the output end of the output feedback loop 90, the output end of the output winding rectifying and filtering circuit 80 is connected with the input end of the output feedback loop 90, and simultaneously outputs a direct current power supply to supply power to the mobile phone, the output end of the output feedback loop 90 is connected with the third input end of the pulse width control loop 60, the output end of the fast charging identification circuit 100 is connected with a load and used for identifying the type of the load and adjusting the output voltage, one input end of the secondary EMI circuit 110 is connected with the different name end of the output winding of the high-frequency transformer 50, and the other input end of the secondary EMI circuit is connected with the different name end of the auxiliary winding.

Specifically, the EMI circuit 10 is used for protecting the mains input and filtering out the interference signal, and includes a first fuse F1 and a first common mode inductor LF 1. One end of the first fuse tube F1 is connected with a live wire input by mains supply, the other end of the first fuse tube F1 is connected with one input end of the first common mode inductor LF1, and when the current on the live wire exceeds the protection current, the first fuse tube F1 is disconnected to protect the back-end circuit; the other end of the first common-mode inductor LF1 is connected with a zero line input by a test point, and the first common-mode inductor LF1 is used for filtering a common-mode interference signal input by mains supply;

the rectifying and filtering circuit 20 is used for rectifying and filtering the mains supply input and comprises a first rectifying bridge BD1, a first capacitor C1, a second capacitor C2, a first resistor R1 and a first inductor L1. The input end of the first rectifier bridge BD1 is connected with the output end of the EMI circuit 10, an ac power source is rectified into steamed bread waves, the anode of the first capacitor C1 is connected with the anode output end of the first rectifier bridge BD1, one end of the first resistor R1 and the input end of the first inductor L1, the anode of the second capacitor C2 is connected with the other end of the first resistor R1 and the output end of the first common mode inductor L1, the cathode output end of the first rectifier bridge BD1, the cathode of the first capacitor C1 and the cathode of the second capacitor C2 are grounded, the first capacitor C1, the first resistor R1, the first inductor L1 and the second capacitor C2 form a pi-type filter circuit, and the stable dc wave output by the first rectifier bridge BD1 is filtered to obtain the steamed bread power source.

The high-voltage starting circuit 30 is used for supplying power to the pulse width control loop when the system is started and stopping working when the system is in normal operation, and comprises a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected to the positive electrode of the dc power output by the rectifying and smoothing circuit 20, the other end is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the first chip U1 of the pulse width control loop 60 to supply power to the first chip U1;

the spike absorption circuit 40 is used for absorbing spike voltage formed in the switching process of the switching tube and protecting the switching tube from breakdown, and comprises a third capacitor C3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first diode D1. A third capacitor C3 is connected with a fourth resistor R4 and a fifth resistor R5 in parallel, one end of the third capacitor C3 is connected with the different name end of the input winding of the first transformer T1, the other end of the third capacitor C3 is connected with one end of a sixth resistor R6, the other end of the sixth resistor R6 is connected with the cathode of a first diode D1, and the anode of the first diode D1 is connected with the same name end of the input winding of the first transformer T1; when the switch tube is switched, the spike absorbing circuit 40 is used for absorbing spike voltage generated at the homonymous terminal of the input winding of the first transformer T1.

The high frequency transformer 50 for coupling electrical energy from a primary side of the high frequency transformer to a secondary side of the high frequency transformer to produce a desired output dc power includes a first transformer T1. The first transformer T1 comprises three windings, namely an input winding, an output winding and an auxiliary winding, wherein the output voltage of the output winding supplies power to the mobile phone after being rectified and filtered; the output voltage of the auxiliary winding is rectified and filtered to supply power to the first chip U1.

The pulse width control circuit 60 generates a pulse width control signal according to an output signal of the output feedback circuit 90, and controls the switching of the switching tube to stabilize the output voltage, and includes a first chip U1, a fifth capacitor C5, a sixth diode D6, a tenth resistor R10, and an eleventh resistor R11. The model of the first chip U1 is SP6648HF, the VDD pin of the first chip U1 is connected to one end of the third resistor R3 in the high voltage starting circuit 30 and the anode of the twelfth capacitor C12 in the auxiliary winding rectifying and filtering circuit 70, when the system is just started, because the auxiliary winding rectifying and filtering circuit 70 does not work normally yet, the high voltage starting circuit 30 supplies power to the first chip U1, when the system is running normally, the auxiliary winding rectifying and filtering circuit 70 supplies power to the first chip U1, the FB pin of the first chip U1 is connected to one end of the fifth capacitor C5, the cathode of the sixth diode D6 and the output of the output feedback loop 90, the other end of the fifth capacitor C5 is grounded to the cathode of the sixth diode D6, the first chip U1 detects the output voltage of the output winding of the transformer T1 through the output feedback loop 90, and adjusts the MOS switch of the built-in switch tube to stabilize the output voltage, the CS pin of the first chip U1 is connected to one end of a tenth resistor R10 and one end of an eleventh resistor R11, the other end of the tenth resistor R10 is grounded to the other end of the eleventh resistor R11 to adjust the maximum output current of the system, when the output current of the system increases, the current flowing through the tenth resistor R10 and the eleventh resistor R11 increases, the CS pin voltage of the first chip U1 increases, when the output current of the system exceeds a set value, the first chip U1 enters a protection state, the DRAIN pin of the first chip U1 is the DRAIN of a built-in switching transistor MOS and is connected to the same-name end of the input winding of the first transformer T1, and when the switching transistor is switched, the input winding of the first transformer T1 operates in an on-off state, thereby transferring electric energy to the output winding and the auxiliary winding of the first transformer.

The auxiliary winding rectifying and filtering circuit 70 is used for rectifying and filtering alternating current generated by an auxiliary winding of the high-frequency transformer T1 and supplying power to the first chip U1, and comprises a second diode D2, a seventh resistor R7 and a twelfth capacitor C12. The anode of the second diode D2 is connected to the dotted terminal of the auxiliary winding of the first transformer T1, the cathode is connected to one end of the seventh resistor R7, the output of the auxiliary winding of the first transformer T1 is rectified, the other end of the seventh resistor R7 is connected to the anode of the twelfth capacitor C12, the seventh resistor R7 is used for limiting the charging current of the twelfth capacitor C12, the cathode of the fourth capacitor C4 is grounded, the output voltage of the auxiliary winding of the first transformer T1 is filtered, and power is supplied to the first chip U1.

The output winding rectifying and filtering circuit 80 is used for rectifying and filtering the alternating current generated by the output winding of the high-frequency transformer T1 to generate the required output direct current to the external device, and includes a twelfth resistor R12, a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9. The anode of a fourth diode D4 is connected with the dotted terminal of the output winding of the first transformer T1, the cathode is connected with the anode of an eighth capacitor C8 for rectifying the alternating current of the output winding of the first transformer T1, the model of the fourth diode D4 is DK5V100R25, a built-in switching tube can realize synchronous switching with the switching tube of a first chip U1, so that the working efficiency is improved, and the working temperature is reduced, one end of a twelfth resistor R12 is connected with the anode of the fourth diode D4, the other end of the twelfth resistor R12 is connected with one end of a seventh capacitor C7, the other end of the seventh capacitor C7 is connected with the cathode of the fourth diode D4, the twelfth resistor R12 and the seventh capacitor C7 form an RC absorption circuit for absorbing the peak voltage generated in the switching process of the fourth diode D4, the eighth capacitor C8 and the ninth capacitor C9 are connected in parallel, the cathode of the eighth capacitor C8 is connected with the cathode of the output voltage, the anode of the eighth capacitor C8 is connected with the cathode 4 of the fourth diode D2, the output voltage of the output winding of the first transformer T1 is filtered.

The output feedback loop 90 is used for feeding back the output of the output winding rectifying and filtering circuit 80 to the pulse width control loop 60 through an optical coupler, and comprises a second chip U4, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eleventh capacitor C11 and a third chip U3. The signal of the third chip U3 is TL431, the cathode of the third chip U3 is connected to the cathode of the second chip U2, the anode is connected to the cathode of the output voltage, the reference electrode thereof generates a reference voltage of 2.5V, one end of a fifteenth resistor R15 is connected to the cathode of the third chip U3, the other end is connected to one end of an eleventh capacitor C11, the other end of the eleventh capacitor C11 is connected to the reference electrode of the third chip U3, the fifteenth capacitor R15 and the eleventh capacitor C11 form an RC compensation circuit for compensating the output feedback loop 90, one end of a thirteenth resistor R13 is connected to the positive electrode of the output voltage, the other end is connected to one end of a fourteenth resistor R14 and the reference electrode of the third chip U3, the other end of a fourteenth resistor R14 is connected to the negative electrode of the output voltage for controlling the magnitude of the output voltage, one end of the sixteenth resistor R16 is connected to the positive electrode of the output voltage, the other end is connected to the anode of the fourth chip U4 and the seventeenth resistor 17, the other end of the seventeenth resistor R17 is connected to the cathode of the fourth chip U4 and the cathode of the third chip U3, and is configured to adjust the operating range of the diode forward current of the fourth chip U4, the emitter of the fourth chip U4 is grounded, the collector is filtered by the fifth capacitor C5 and then connected to the FB pin of the first chip U1, when the voltage value of the output voltage changes, the diode forward current flowing through the fourth chip U4 changes and feeds back the current to the FB pin of the first chip U1, so that the first chip U1 changes the pulse width to adjust the output voltage and stabilize the output voltage.

The quick charging identification circuit 100 is used for automatically identifying the type of the charging equipment, adjusting the output voltage of the charger, obtaining the highest safe charging voltage allowed by the charging equipment, and saving the charging time on the premise of protecting the safety of the charging equipment, and comprises a second chip U2, a nineteenth resistor R19 and a tenth capacitor C10. One end of a nineteenth resistor R19 is connected with the positive electrode of the output voltage, the other end of the nineteenth resistor R19 is connected with the VDD pin and the EN pin of the second chip U2, the D-pin of the second chip U2 is connected with the D-pin of the charging device, the D + pin of the second chip U2 is connected with the D + pin of the charging device, the FBO pin of the second chip U2 is connected with the reference voltage of the output feedback loop 90, and the type of the charging device and the battery level are acquired through communication between the second chip U2 and the charging device. One end of the tenth capacitor C10 is connected to the VDD pin of the second chip U2, and the other end thereof is connected to the negative electrode of the output voltage.

The secondary EMI circuit 110 is configured to provide a loop for a common mode signal of the secondary side of the high frequency transformer to the primary side of the high frequency transformer to reduce the effect of the common mode signal on the output, and includes a first Y capacitor CY 1. One end of the first Y capacitor CY1 is connected to the synonym terminal of the output winding of the first transformer T1, and the other end is connected to the synonym terminal of the auxiliary winding of the first transformer T1.

Although the present invention has been described in connection with the above embodiments, the scope of the present invention is not limited thereto, and modifications, replacements, and the like to the above members are all within the scope of the claims of the present invention without departing from the concept of the present invention.

Claims

1. The intelligent output switching power supply charging circuit is characterized by comprising an EMI circuit (10) connected with mains supply input, a rectifying and filtering circuit (20) connected with the output end of the EMI circuit (10), a high-voltage starting circuit (30) connected with the output end of the rectifying and filtering circuit (20), a peak absorption circuit (40) connected with the output end of the rectifying and filtering circuit (20), a high-frequency transformer (50) connected with the output end of the peak absorption circuit (40), a pulse width control loop (60) respectively connected with the output end of the high-voltage starting circuit (30) and the output end of the peak absorption circuit (40), an auxiliary winding rectifying and filtering circuit (70) respectively connected with the output end of the high-frequency transformer (50) and one input end of the pulse width control loop (60), an output winding rectifying and filtering circuit (80) connected with the output end of the high-frequency transformer (50), and a power supply charging circuit, The pulse width control circuit comprises an output feedback loop (90) connected with one input end of a pulse width control loop (60), a quick identification circuit (100) connected with a load and a secondary EMI circuit (110) arranged between an auxiliary winding and an output winding of a high-frequency transformer (50), wherein the output end of an output winding rectifying and filtering circuit (80) is connected with the load and supplies power to the load.

2. The intelligent output switching power charging circuit according to claim 1, wherein the EMI circuit (10) comprises a first fuse F1 and a first common mode inductor LF1, one end of the first fuse F1 is connected to the live line of the mains input, the other end of the first fuse F1 is connected to one input end of the first common mode inductor LF1, and the other input end of the first common mode inductor LF1 is connected to the neutral line of the mains input.

3. The charging circuit of claim 1, wherein the rectifying-filtering circuit (20) comprises a first rectifying bridge BD1, a first capacitor C1, a second capacitor C2, a first resistor R1 and a first inductor L1, an input terminal of the first rectifying bridge BD1 is connected to an output terminal of the EMI circuit (10), an anode output terminal of the first rectifying bridge BD1 is connected to an anode of the first capacitor C1, one terminal of the first resistor R1 and an input terminal of the first inductor L1, the other terminal of the first resistor R1 and an output terminal of the first inductor L1 are respectively connected to an anode of the second capacitor C2, and a cathode output terminal of the first rectifying bridge BD1, a cathode of the first capacitor C1 and a cathode of the second capacitor C2 are respectively connected to ground.

4. The intelligent output switching power charging circuit according to claim 1, wherein the high voltage starting circuit (30) comprises a second resistor R2 and a third resistor R3, one end of the second resistor R2 is connected to the output end of the rectifying and filtering circuit (20), and the other end of the second resistor R2 is connected to the pulse width control loop (60).

5. The charging circuit of claim 1, wherein the peak absorption circuit (40) comprises a third capacitor C3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first diode D1, the high frequency transformer (50) is a first transformer T1, the third capacitor C3 is connected in parallel with a fourth resistor R4 and a fifth resistor R5, one end of the third capacitor C3 is connected with the output end of the rectifying and filtering circuit (20) and the different name end of the input winding of the first transformer T1, the other end of the third capacitor C3 is connected with one end of a sixth resistor R6, the other end of the sixth resistor R6 is connected with the cathode of a first diode D1, the anode of the first diode D1 is connected with the different name end of the input winding of a first transformer T1, the secondary EMI circuit (110) is a first Y capacitor CY1, and the one end of the first Y capacitor R1 is connected with the different name end of the transformer T1, the other end of the first transformer is connected with the synonym terminal of the auxiliary winding of the first transformer T1.

6. The charging circuit of claim 1, wherein the pulse width control loop (60) comprises a first chip U1, a fifth capacitor C5, a sixth diode D6, a tenth resistor R10 and an eleventh resistor R11, the first chip U1 is SP6648HF, the VDD pin of the first chip U1 is connected to the high voltage starting circuit (30) and the auxiliary winding rectifying and filtering circuit (70), the FB pin of the first chip U1 is connected to the cathode of the sixth diode D6, one end of the fifth capacitor C5 and the output end of the output feedback loop (90), the CS pin of the first chip U1 is connected to one end of the tenth resistor R10 and one end of the eleventh resistor R11, the DRAIN pin of the first chip U1 is connected to the high frequency transformer (50), the anode of the sixth diode D6 and the other end of the fifth capacitor C5 are connected to the high voltage transformer (50), and the DRAIN pin of the first chip U6338 is connected to the high voltage starting circuit, The other end of the tenth resistor R10 and the other end of the eleventh resistor R11 are grounded.

7. The charging circuit of claim 1, wherein the auxiliary winding rectifying filter circuit (70) comprises a second diode D2, a seventh resistor R7 and a twelfth capacitor C12, the anode of the second diode D2 is connected to the high frequency transformer (50), the cathode of the second diode D2 is connected to one end of a seventh resistor R7, the other end of the seventh resistor R7 and the anode of the twelfth capacitor C12 are connected to the pulse width control loop (60), the cathode of the twelfth capacitor C12 is grounded, the output winding rectifying filter circuit (80) comprises a twelfth resistor R12, a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8 and a ninth capacitor C9, the fourth diode D4 is DK5V85R15S, the anode of the fourth diode D4 and one end of the twelfth resistor R12 are connected to the high frequency transformer (50), and the cathode of the fourth diode D4 is connected to the anode of the eighth capacitor C8, The anode of the seventh capacitor C7 and the anode of the ninth capacitor C9 are connected with an output feedback loop (90), the other end of the twelfth resistor R12 is connected with the other end of the seventh capacitor C7, and the cathode of the eighth capacitor C8 and the cathode of the ninth capacitor C9 are connected with the cathode of the output voltage.

8. The charging circuit of claim 1, wherein the output feedback loop (90) comprises a second chip U4, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eleventh capacitor C11, and a third chip U3, wherein an anode of the second chip U4 is connected to one end of the sixteenth resistor R16 and one end of the seventeenth resistor R17, a cathode of the second chip U4 is connected to a cathode of the third chip U3, one end of the fifteenth resistor R15, and the other end of the seventeenth resistor R17, a collector of the second chip U4 is connected to the pulse width control loop (60), the other end of the sixteenth resistor R16 and one end of the thirteenth resistor R13 are connected to the output winding rectifying and filtering circuit (80), and an eleventh reference capacitor 11 is connected to a pole of the third chip U3, One end of a fourteenth resistor R14, the other end of a thirteenth resistor R13 and the quick-charge identification circuit (100) are connected, the other end of the fifteenth resistor R15 is connected with the other end of an eleventh capacitor C11, and the anode of the third chip U3 and the other end of the fourteenth resistor R14 are grounded.

9. The switch power supply charging circuit capable of intelligently outputting according to claim 8, wherein the fast charging identification circuit (100) comprises a second chip U2, a nineteenth resistor R19 and a tenth capacitor C10, the FBO pin of the second chip U2 is connected with the output feedback loop (90), the D + pin of the second chip U2 is connected with the D + pin of the charging device, the D-pin of the second chip U2 is connected with the D-pin of the charging device, the VDD pin of the second chip U2 is connected with the EN pin of the second chip U2, one end of the tenth capacitor C10 and one end of the nineteenth resistor R19, the other end of the nineteenth resistor R19 is connected with the positive pole of the output voltage, and the other end of the tenth capacitor C10 is connected with the negative pole of the output voltage.

10. The intelligent output switching power supply charging circuit according to claim 1, wherein the mains supply input is 90-264V ac, and the output voltage of the output end of the output winding rectifying and filtering circuit (80) is 5V/3.0A, 9V/2.0A and 12V/1.5A dc.