CN209881475U - Small-size switching power supply charging circuit - Google Patents
Small-size switching power supply charging circuit Download PDFInfo
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- CN209881475U CN209881475U CN201920752042.9U CN201920752042U CN209881475U CN 209881475 U CN209881475 U CN 209881475U CN 201920752042 U CN201920752042 U CN 201920752042U CN 209881475 U CN209881475 U CN 209881475U
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Abstract
The utility model discloses a small switching power supply charging circuit, this charging circuit include exchange protection circuit, rectification filter circuit, high-pressure starting circuit, peak absorption circuit, high frequency transformer, pulse width control return circuit, auxiliary winding rectification filter circuit, output winding rectification filter circuit and secondary EMI circuit, and output winding rectification filter circuit's output is connected with the load and is the load power supply. This circuit can convert 85 ~ 265V alternating current to 5V 3A's direct current, the utility model discloses a whole small, with low costs of switching power supply charging circuit, and second chip U2 replaces traditional schottky, and is efficient, can satisfy the requirement of six grades of efficiency of EU to the at utmost, reduces the complete machine temperature simultaneously.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a charging circuit especially relates to a can exchange commercial power 85 ~ 265V and convert 5V3A direct current's small switching power supply's charging circuit.
[ background of the invention ]
The MOS at the front end of the existing 5V3A switching power supply charging circuit is generally externally arranged, and the Schottky diode with large current is selected for rectification at the rear end, so that the problems of large volume and high cost are solved, the efficiency of the whole machine is difficult to meet the requirement of European Union six-level energy efficiency, in addition, the temperature of the whole machine is high, and the service life is short. Therefore, how to simplify the charging circuit of the switching power supply to meet the requirement of the energy efficiency of the sixth level of the european union and reduce the temperature and the cost of the whole machine becomes an objective requirement.
[ Utility model ] content
The utility model aims to solve the above problems, and provides a small size switching power supply charging circuit that is small in size, low in cost and meets the requirement of EU six-level energy efficiency.
The utility model relates to a small-sized charging circuit of a switching power supply, which comprises an AC protection circuit connected with a mains supply input, a rectifying and filtering circuit connected with the output end of the AC protection circuit, a high-voltage starting circuit connected with the output end of the rectifying and filtering circuit, and a peak absorption circuit connected with the output end of the rectifying and filtering circuit, the high-frequency power supply circuit comprises a high-frequency transformer connected with the output end of a peak absorption circuit, a pulse width control circuit connected with the output end of a high-voltage starting circuit and the output end of the peak absorption circuit respectively, an auxiliary winding rectifying and filtering circuit connected with the output end of the high-frequency transformer and the output end of the pulse width control circuit respectively, an output winding rectifying and filtering circuit connected with the output end of the high-frequency transformer and a secondary EMI circuit arranged between a primary winding and output voltage of the high-frequency transformer, wherein the output end of the output winding rectifying and filtering circuit is connected with a load and supplies.
Exchange protection circuit includes first protective tube F1 and piezo-resistor VR1, 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 piezo-resistor VR 1's one end, piezo-resistor VR 1's the other end is connected with commercial power input's zero line and rectifier filter circuit's input respectively.
The rectifying and filtering circuit comprises a first rectifying bridge BD1, a first capacitor C1, a second capacitor C2, a first resistor R1, a first common-mode inductor L1 and a fourth inductor L4, wherein an input end of the first rectifying bridge BD1 is connected with an output end of the alternating current protection circuit, an anode output end of the first rectifying bridge BD1 is respectively connected with an anode of the first capacitor C1, one end of the first resistor R1 and one input end of the first common-mode inductor L1, a cathode output end of the first rectifying bridge BD1 is respectively connected with a cathode of the first capacitor C1, the other input end of the first common-mode inductor L1 and one end of the fourth inductor L4, the other end of the first resistor R1 and one output end of the first common-mode inductor L1 are respectively connected with an anode of the second capacitor C2, and the other output end of the first common-mode inductor L1, the other end 4 and the cathode of the second capacitor are grounded.
The high-voltage starting circuit comprises a tenth resistor R10 and an eleventh resistor R11, one end of the tenth resistor R10 is connected with the output end of the rectifying and filtering circuit, the other end of the tenth resistor R3526 is connected with one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected with a VDD pin of a first chip U1 of the pulse width control loop.
The spike absorption circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth capacitor C6 and a first diode D1, the high-frequency transformer is a first transformer T1, the sixth capacitor C6 is respectively connected with the second resistor R2 and the third resistor R3 in parallel, one end of the sixth capacitor C6 is connected to the synonym terminal of the input winding of the first transformer T1, the other end thereof is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the cathode of a first diode D1, the anode of the first diode D1 is connected to the dotted terminal of the input winding of the first transformer T1, the dotted terminal of the auxiliary winding of the first transformer T1 is respectively connected to an input terminal of the pulse width control circuit and an input terminal of the auxiliary winding rectifying and filtering circuit, the output winding of the first transformer T1 is connected with the input end of the output winding rectifying and filtering circuit.
The pulse width control loop comprises a first chip U1, a seventh capacitor C7, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a ninth resistor R9, the model of the first chip U1 is SP2689F, the inside of the circuit comprises a switching tube MOS, a VDD pin of the first chip U1 is respectively connected with the output end of the high-voltage starting circuit and the output end of the auxiliary winding rectifying and filtering circuit, the FB pin of the first chip U1 is respectively connected with one end of a seventh resistor R7, one end of a ninth resistor R9 and one end of a seventh capacitor C7, the CS pin of the first chip U1 is respectively connected with one end of a fifth resistor R5 and one end of a sixth resistor R6, the Drain pin of the first chip U1 is connected with a high-frequency transformer, the other end of the seventh resistor R7, the other end of the seventh capacitor C7, the other end of the fifth resistor R5 and the other end of the sixth resistor R6 are grounded, and the other end of the ninth resistor R9 is connected with a high-frequency transformer.
The auxiliary winding rectifying and filtering circuit comprises an eighth resistor R8, a second diode D2 and a third capacitor C3, one end of the eighth resistor R8 is connected with the high-frequency transformer, the other end of the eighth resistor R8 is connected with the anode of the second diode D2, the cathode of the second diode D2 is connected with the anode of the third capacitor C3, and the cathode of the third capacitor C3 is grounded.
The output winding rectifying and filtering circuit comprises a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a third diode D3, a fourth capacitor C4, a fifth capacitor C5, an eighth capacitor C8, a ninth capacitor C9 and a second chip U2, wherein the model of the second chip U2 is SP6503F, a synchronous rectifying control and switching tube MOS is arranged in the second chip U2, a SW pin of the second chip U2 is respectively connected with one end of a high-frequency transformer and one end of a ninth capacitor C9, a VDD pin of the second chip U2 is respectively connected with one end of an eighth capacitor C8, one end of the twelfth resistor R12 and a cathode of a third diode D3, the other end of the ninth capacitor C6867 is connected with one end of the thirteenth resistor R13, an anode of the third diode D3, an anode of the fourth capacitor C3, an anode of the fifth capacitor C72, a positive electrode of the fifth capacitor C8672 and a positive electrode of the fifteenth resistor R36 9 2 are respectively connected with one end of the high-frequency transformer R36 9 2, the other end of the fifteenth resistor R15 is connected to one end of a fourteenth resistor R14, and the other end of the eighth capacitor C8, the other end of the twelfth resistor R12, the other end of the thirteenth resistor R13, the cathode of the fourth capacitor C4, the cathode of the fifth capacitor C5, the other end of the sixteenth resistor R16, and the other end of the fourteenth resistor R14 are connected.
The secondary EMI circuit is a first Y capacitor CY1, one end of the first Y capacitor CY1 is connected to the negative electrode of the output voltage, and the other end is connected to the synonym terminal of the input winding of the first transformer T1.
The commercial power input voltage is 85-265V alternating current, and the output voltage of the output end of the output winding rectifying and filtering circuit is 5V3A direct current.
The utility model has the advantages that: the utility model discloses a model of first chip U1 in small switching power supply's pulse width control circuit is SP2689F, the model of second chip U2 among the output winding rectification filter circuit is SP6503F, because first chip U1 and second chip U2 all embed the MOS pipe, make the circuit simplify, whole small, and low cost, and second chip U2 replaces traditional schottky, and is efficient, can satisfy the requirement of six grades of efficiency of European Union in the at utmost, reduce the complete machine temperature simultaneously.
[ 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 ac 85 Vac-265 Vac into dc output of 5Vdc/3A, thereby realizing fast charging of the mobile phone. The charging circuit comprises an alternating current protection 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 circuit 60, an auxiliary winding rectifying and filtering circuit 70, an output winding rectifying and filtering circuit 80 and a secondary EMI circuit 90.
As shown in fig. 1 and fig. 2, the input end of the ac protection circuit 10 is connected to the mains input, the output end thereof is connected to the input end of the rectification filter circuit 20, the output end of the rectification filter circuit 20 is connected to the input end of the high-voltage starting circuit 30 and the input end of the spike absorbing circuit 40, the output end of the high-voltage starting circuit 30 is connected to one input end of the pulse width control circuit 60, the output end of the spike absorbing circuit 40 is connected to the input winding of the high-frequency transformer 50 and the output end of the pulse width control circuit 60, the auxiliary winding of the high-frequency transformer 50 is connected to the input end of the auxiliary winding rectification filter circuit 70, the output winding of the high-frequency transformer 50 is connected to the input end of the output winding rectification filter circuit 80, one input end of the pulse width control circuit 60 is connected to the output end of the, the output end of the output rectifying filter circuit 80 outputs a 5V dc power supply to supply power to the mobile phone, one input end of the secondary EMI circuit 90 is connected to the negative electrode of the output voltage, and the other input end is connected to the synonym end of the input winding of the high-frequency transformer 40.
Specifically, the ac protection circuit 10 is used for protecting the utility power, and includes a first fuse F1 and a voltage dependent resistor VR 1. One end of the first fuse F1 is connected with a live wire input by mains supply, the other end of the first fuse F1 is connected with one end of the voltage dependent resistor VR1, and when the current on the live wire exceeds the protection current, the first fuse F1 is disconnected to protect the rear-end circuit; the other end of the voltage dependent resistor VR1 is connected with a zero line of commercial power input, the voltage dependent resistor VR1 is used for performing overvoltage protection on the commercial power input, and when the voltage of the commercial power input is too high, the resistance value of the voltage dependent resistor VR1 is rapidly reduced to protect the back end circuit;
the rectifying and filtering circuit 20 is configured to rectify and filter an output of the ac protection circuit 10, and includes a first rectifying bridge BD1, a first capacitor C1, a second capacitor C2, a first resistor R1, a first common-mode inductor L1, and a fourth inductor L4. An input end of a first rectifier bridge BD1 is connected with an output end of the AC protection circuit 10, an AC power source is rectified into a fundamental wave, an anode of a first capacitor C1 is connected with an anode output end of the first rectifier bridge BD1, one end of a first resistor R1 and one input end of a first common mode inductor L1, a cathode of a first capacitor C1 is connected with a cathode output end of the first rectifier bridge BD1, the other input end of the first inductor L1 and one end of a fourth inductor L4, an anode of a second capacitor C2 is connected with the other end of the first resistor R1 and one output end of the first common mode inductor L1, a cathode of the second capacitor C2, the other output end of the first common mode inductor L1 and the other end of the fourth inductor L4 are grounded, the first capacitor C1, the first resistor R1, the first common mode inductor L1, the fourth common mode inductor L4 and a second capacitor C2 form a fundamental wave rectifying filter circuit 1 for filtering the fundamental wave output from the fundamental wave of the first pi rectifier bridge BD1, and obtaining the stable direct current power supply.
The high-voltage starting circuit 30 is used for supplying power to the pulse width control circuit 60 when the system is started, and the high-voltage starting circuit 30 stops working when the system is in normal operation, and comprises a tenth resistor R10 and an eleventh resistor R11. One end of the tenth resistor R10 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 eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the first chip U1 of the pulse width control loop 60, so as 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 sixth capacitor C6, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first diode D1. A sixth capacitor C6 is connected with the second resistor R2 and the third resistor R3 in parallel, one end of the sixth capacitor C6 is connected with the different name end of the input winding of the first transformer T1, the other end of the sixth capacitor C6 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 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 comprises three windings, namely an input winding, an output winding and an auxiliary winding, and 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 the auxiliary winding voltage to control the switching of the switching tube to stabilize the output voltage, and includes a first chip U1, a seventh capacitor C7, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a ninth resistor R9. The VDD pin of the first chip U1 is connected to one end of an eleventh resistor R11 in the high-voltage starting circuit 30 and the positive electrode of a third capacitor C3 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 a ninth resistor R9, one end of a seventh resistor R7 and one end of a seventh capacitor C7, the other end of a seventh resistor R7 and the other end of a seventh capacitor C7 are grounded, the other end of a ninth resistor R9 is connected to the same-name end of the auxiliary winding of a transformer T1, the seventh resistor R7, the seventh capacitor C7 and the ninth resistor R9 form a feedback loop, the first chip U1 detects the output voltage of the auxiliary winding T1 through the feedback loop, the switch of the built-in switch tube is adjusted to stabilize the output voltage, the CS pin of the first chip U1 is connected with one end of a fifth resistor R5 and one end of a sixth resistor R6, the other end of the fifth resistor R5 is grounded with the other end of the sixth resistor R6, when the system output current is increased, the current flowing through the fifth resistor R5 and the sixth resistor R6 is increased, the CS pin voltage of the first chip U1 is increased, when the system output current exceeds a set value, the first chip U1 enters a protection state, the pin of the first chip U1 is the DRAIN electrode of the built-in switch tube MOS and is connected with the same name end of the input winding of the first transformer T1, and when the switch tube is switched, the input winding of the first transformer T1 works in an on-off state, so that the electric energy is transferred to the output winding and the auxiliary winding of the first transformer T1.
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 an eighth resistor R8, a second diode D2 and a third capacitor C3. One end of an eighth resistor R8 is connected with the dotted end of the auxiliary winding of the first transformer T1, the other end of the eighth resistor R8 is connected with the anode of a second diode D2, the cathode of the second diode D2 is connected with the anode of a third capacitor C3, and the cathode of the third capacitor C3 is grounded and used for filtering the output voltage of the auxiliary winding of the transformer T1.
The output winding rectifying and filtering circuit 80 is used for rectifying and filtering alternating current generated by an output winding of the high-frequency transformer T1 to generate required output direct current to external equipment, and comprises a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a third diode D3, a fourth capacitor C4, a fifth capacitor C5, an eighth capacitor C8, a ninth capacitor C9 and a second chip U2. The model of the second chip U2 is SP6503F, which is internally provided with a synchronous rectification control and a switching tube MOS, and can realize synchronous rectification and improve the working efficiency, the SW pin of the second chip U2 is connected with the different name end of the output winding of the first transformer T1, the VDD pin of the second chip U2 is connected with the cathode of a third diode D3, one end of an eighth capacitor C8 and one end of a twelfth resistor R12, the anode of the third diode D3 is connected with the same name end of the output winding of the first transformer T1, the other ends of an eighth capacitor C8 and a twelfth resistor are connected with the cathode of the output voltage, one end of a ninth capacitor C9 is connected with the SW pin of the second chip U2, the other end is connected with one end of a thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected with the GND pin of the second chip U2 and the cathode of the output voltage, the ninth capacitor C9 and the thirteenth resistor R13 form an RC absorption circuit, absorbing the peak voltage generated when the second chip U2 is switched, connecting the fourth capacitor C4 with the fifth capacitor C5 in parallel, connecting the positive pole of the fourth capacitor C4 with the same name end of the output winding of the transformer T1 and the positive pole of the output voltage, connecting the negative pole of the fourth capacitor with the negative pole of the output voltage, filtering the output voltage, wherein one end of a sixteenth resistor R16 is connected with the positive pole of the output voltage, the other end of the sixteenth resistor R16 is connected with the negative pole of the output voltage, the sixteenth resistor R16 is used as a dummy load of the output voltage to stabilize a direct current output power supply, one end of a fifteenth resistor R15 is connected with the positive pole of the output voltage, the other end of the fifteenth resistor R15 is connected with one end of a fourteenth resistor R14 and second and third pins of a USB plug, the other end of the fourteenth resistor R14 is connected with the negative pole of the output voltage, the voltage is divided by a fifteenth resistor R15 and a fourteenth resistor R14, and a stable voltage is provided for the second pin and the third pin of the USB plug.
The secondary EMI circuit 90, which is used to provide a loop for the 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, includes a first Y capacitor CY 1. One end of the first Y capacitor CY1 is connected to the negative electrode of the output voltage, and the other end is connected to the unlike end of the input 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 (10)
1. The charging circuit of the switching power supply is characterized by comprising an alternating current protection circuit (10) connected with a mains supply input, a rectifying and filtering circuit (20) connected with an output end of the alternating current protection circuit (10), a high-voltage starting circuit (30) connected with an output end of the rectifying and filtering circuit (20), a peak absorption circuit (40) connected with an output end of the rectifying and filtering circuit (20), a high-frequency transformer (50) connected with an output end of the peak absorption circuit (40), a pulse width control loop (60) respectively connected with an output end of the high-voltage starting circuit (30) and an output end of the peak absorption circuit (40), an auxiliary winding rectifying and filtering circuit (70) respectively connected with an output end of the high-frequency transformer (50) and an output end of the pulse width control loop (60), an output winding rectifying and filtering circuit (80) connected with an output end of the high-frequency transformer (50), and a secondary winding arranged between a primary winding of the high-frequency transformer (50) and an output voltage And the output end of the output winding rectifying and filtering circuit (80) is connected with the load and supplies power to the load.
2. The small-sized switching power supply charging circuit according to claim 1, wherein the ac protection circuit (10) includes a first fuse F1 and a voltage dependent resistor VR1, one end of the first fuse F1 is connected to the live line of the commercial power input, the other end of the first fuse F1 is connected to one end of the voltage dependent resistor VR1, and the other end of the voltage dependent resistor VR1 is connected to the neutral line of the commercial power input and the input end of the rectifying and filtering circuit (20), respectively.
3. The small-sized charging circuit for switching power supply according to 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, a first common-mode inductor L1 and a fourth inductor L4, an input terminal of the first rectifying bridge BD1 is connected to an output terminal of the ac protection circuit (10), a positive output terminal of the first rectifying bridge BD1 is connected to a positive terminal of the first capacitor C1, one terminal of the first resistor R1 and one input terminal of the first common-mode inductor L1, a negative output terminal of the first rectifying bridge BD1 is connected to a negative terminal of the first capacitor C1, another input terminal of the first common-mode inductor L1 and one terminal of the fourth inductor L4, another terminal of the first resistor R1 and one output terminal of the first common-mode inductor L1 are connected to a positive terminal of the second capacitor C2, and another output terminal of the first common-mode inductor L1 is connected to a positive terminal of the second common-mode inductor L2, The other end of the fourth inductor L4 and the negative electrode of the second capacitor are grounded.
4. The small-sized switching power supply charging circuit according to claim 1, wherein the high-voltage start circuit (30) includes a tenth resistor R10 and an eleventh resistor R11, one end of the tenth resistor R10 is connected to the output terminal of the rectifying and smoothing circuit (20), the other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the VDD pin of the first chip U1 of the pulse width control loop (60).
5. The compact switching power charging circuit as claimed in claim 1, wherein the spike absorption circuit (40) comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth capacitor C6 and a first diode D1, the high frequency transformer (50) is a first transformer T1, the sixth capacitor C6 is connected in parallel with the second resistor R2 and the third resistor R3, respectively, one end of the sixth capacitor C6 is connected to the different name end of the input winding of the first transformer T1, the other end is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the same name end of the input winding of the first transformer T1, the same name end of the auxiliary winding of the first transformer T1 is connected to one input end of the pulse width control loop (60) and the input end of the auxiliary winding rectifying filter circuit (70), the output winding of the first transformer T1 is connected with the input end of an output winding rectifying and filtering circuit (80).
6. The compact switching power charging circuit as claimed in claim 1, wherein the pulse width control circuit (60) includes a first chip U1, a seventh capacitor C7, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a ninth resistor R9, the first chip U1 is model SP2689F, which includes a switching transistor MOS therein, a VDD pin of the first chip U1 is connected to the output terminal of the high voltage starting circuit (30) and the output terminal of the auxiliary winding rectifying and filtering circuit (70), an FB pin of the first chip U1 is connected to one end of the seventh resistor R7, one end of the ninth resistor R9 and one end of the seventh capacitor C7, a CS pin of the first chip U1 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, a Drain pin of the first chip U1 is connected to the high frequency transformer (50), and the other end of the seventh resistor R7 is connected to one end of the high frequency transformer (50), The other end of the seventh capacitor C7, the other end of the fifth resistor R5 and the other end of the sixth resistor R6 are grounded, and the other end of the ninth resistor R9 is connected with a high-frequency transformer (50).
7. The small-sized switching power supply charging circuit according to claim 1, wherein the auxiliary winding rectifying and smoothing circuit (70) comprises an eighth resistor R8, a second diode D2 and a third capacitor C3, one end of the eighth resistor R8 is connected to the high-frequency transformer (50), the other end of the eighth resistor R8 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the anode of the third capacitor C3, and the cathode of the third capacitor C3 is grounded.
8. The small-sized switching power supply charging circuit according to claim 1, wherein the output winding rectifying and filtering circuit (80) includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a third diode D3, a fourth capacitor C4, a fifth capacitor C5, an eighth capacitor C8, a ninth capacitor C9 and a second chip U2, the model of the second chip U2 is SP6503F with a built-in synchronous rectification control and switching tube MOS, the SW pin of the second chip U2 is connected to one end of the high frequency transformer (50) and the ninth capacitor C9, the VDD pin of the second chip U2 is connected to one end of the eighth capacitor C8, one end of the twelfth resistor R12 and the cathode of the third diode D3, the other end of the ninth capacitor C9 is connected to one end of the thirteenth resistor R13, and the anode of the third diode D3 is connected to the anode of the high frequency transformer, The positive electrode of the fourth capacitor C4, the positive electrode of the fifth capacitor C5, one end of a sixteenth resistor R16 and one end of a fifteenth resistor R15 are respectively connected with the high-frequency transformer (50), the other end of the fifteenth resistor R15 is connected with one end of a fourteenth resistor R14, and the other end of the eighth capacitor C8, the other end of the twelfth resistor R12, the other end of the thirteenth resistor R13, the negative electrode of the fourth capacitor C4, the negative electrode of the fifth capacitor C5, the other end of the sixteenth resistor R16 and the other end of the fourteenth resistor R14 are connected.
9. The compact switching power supply charging circuit as claimed in claim 5, characterized in that the secondary EMI circuit (90) is a first Y capacitor CY1, one end of the first Y capacitor CY1 is connected to the negative pole of the output voltage, and the other end is connected to the synonym terminal of the input winding of the first transformer T1.
10. The small-sized switching power supply charging circuit according to claim 1, wherein the mains supply input is 85-265V ac, and the output voltage of the output end of the output winding rectifying and filtering circuit (80) is 5V3A dc.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920752042.9U CN209881475U (en) | 2019-05-23 | 2019-05-23 | Small-size switching power supply charging circuit |
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| CN201920752042.9U CN209881475U (en) | 2019-05-23 | 2019-05-23 | Small-size switching power supply charging circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112769140A (en) * | 2020-12-28 | 2021-05-07 | 科华恒盛股份有限公司 | Alternating current voltage stabilizer and power supply equipment |
| CN112888109A (en) * | 2021-03-24 | 2021-06-01 | 东莞市皇品光电科技有限公司 | LED driving switch power supply circuit with high PF and low THD |
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2019
- 2019-05-23 CN CN201920752042.9U patent/CN209881475U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112769140A (en) * | 2020-12-28 | 2021-05-07 | 科华恒盛股份有限公司 | Alternating current voltage stabilizer and power supply equipment |
| CN112888109A (en) * | 2021-03-24 | 2021-06-01 | 东莞市皇品光电科技有限公司 | LED driving switch power supply circuit with high PF and low THD |
| CN112888109B (en) * | 2021-03-24 | 2022-05-10 | 东莞市皇品光电科技有限公司 | LED driving switch power supply circuit with high PF and low THD |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Small switching power supply charging circuit Effective date of registration: 20221124 Granted publication date: 20191231 Pledgee: SHENZHEN RURAL COMMERCIAL BANK CO.,LTD. Pledgor: SHENZHEN BENIFIL ELECTRONIS CO.,LTD. Registration number: Y2022980023253 |