Charging circuit based on Mass protection rechargeable battery and control method thereof

Abstract

The invention relates to the technical field of power supplies, and discloses a charging circuit based on a Mass protection rechargeable battery and a control method thereof.The charging circuit comprises an input interface circuit, a parallel power supply circuit and an output interface circuit, the input interface circuit is connected with the parallel power supply circuit, and the parallel power supply circuit is connected with the output interface circuit; the parallel power supply circuit is formed by connecting at least three power supply circuit units in parallel, each power supply circuit unit comprises a transformer circuit, an output power supply circuit, a single chip microcomputer control circuit, a PWM control circuit, a feedback voltage circuit and an indication circuit, the input rectification filter circuit is connected with the transformer circuit and the PWM control circuit, and the transformer circuit is connected with the output power supply circuit. The PWM control circuit is connected with the transformer circuit, the PWM control circuit is connected with the feedback voltage circuit, the feedback voltage circuit is connected with the single-chip microcomputer control circuit, the single-chip microcomputer control circuit is connected with the output power supply circuit, and the single-chip microcomputer control circuit is connected with the indicating circuit. The charging circuit realizes saturated charging of the storage battery.

Description

Technical Field

[0001] This invention relates to the field of charging power supply technology, specifically to a charging circuit and its control method based on a Maas-protected rechargeable battery. Background Technology

[0002] A switching power supply, also known as a switching converter or switching power supply unit, is a high-frequency power conversion device and a type of power supply. Its function is to convert a voltage at a certain level into the voltage or current required by the user through different structural forms. The input of a switching power supply is mostly AC power (such as mains power) or DC power, while the output is mostly for devices that require DC power, such as personal computers and mobile phones. The switching power supply performs the voltage and current conversion between these two sources.

[0003] However, existing switching power supplies on the market suffer from problems such as incomplete charging and high energy consumption. For example, when using a switching power supply, the charging time for the battery is relatively long, and the battery often fails to reach a fully charged state. Prolonged use can reduce the battery's lifespan. These chargers on the market are generally constant current chargers. While the current remains constant when the battery is almost fully charged, the voltage increases, resulting in significant energy loss and the conversion of electrical energy into heat, causing the battery to overheat.

[0004] Therefore, existing power supply methods need further improvement to address the above issues. Summary of the Invention

[0005] The purpose of this invention is to overcome existing problems such as incomplete charging. By rationally designing the charging circuit, employing an input interface circuit, a parallel power supply circuit, and an output interface circuit, and combining these with an input rectifier and filter circuit, a transformer circuit, an output power supply circuit, a microcontroller control circuit, a PWM control circuit, a feedback voltage circuit, and an indicator circuit, full charging of the battery can be achieved. This can satisfy the ideal charging curve of Maas and effectively increase the battery's lifespan.

[0006] The specific technical solution of the present invention is as follows:

[0007] A charging circuit based on a Maas-protected rechargeable battery, the charging circuit comprising: an input interface circuit, a parallel power supply circuit, and an output interface circuit, wherein the input terminal of the input interface circuit is connected to an external AC power supply, the output terminal of the input interface circuit is connected to the input terminal of the parallel power supply circuit, the output terminal of the parallel power supply circuit is connected to the input terminal of the output interface circuit, and the output terminal of the output interface circuit is connected to an external battery.

[0008] The parallel power supply circuit includes at least three power supply circuit units connected in parallel.

[0009] The input interface circuit includes an input interface and an input rectifier and filter circuit, wherein the output terminal of the input interface is connected to the input terminal of the rectifier and filter circuit;

[0010] The power supply circuit unit includes a transformer circuit, an output power supply circuit, a microcontroller control circuit, a PWM control circuit, a feedback voltage circuit, and an indicator circuit. The output terminal of the input rectifier and filter circuit is connected to the input terminal of the transformer circuit and the input terminal of the PWM control circuit. The output terminal of the transformer circuit is connected to the input terminal of the output power supply circuit. The output terminal of the PWM control circuit is connected to the other end of the input terminal of the transformer circuit. The feedback terminal of the PWM control circuit is connected to the feedback terminal of the feedback voltage circuit. The control terminal of the feedback voltage circuit is connected to the control terminal of the microcontroller control circuit. The input terminal of the microcontroller control circuit is connected to the output terminal of the output power supply circuit. The output terminal of the microcontroller control circuit is connected to the input terminal of the indicator circuit. The output terminal of the output power supply circuit is connected to the input terminal of the output interface circuit.

[0011] Furthermore, the output power supply circuit includes an output voltage regulator circuit and an output terminal circuit. The input terminal of the output terminal circuit and the input terminal of the output voltage regulator circuit are respectively connected to the output terminal of the transformer circuit. The output terminal of the output terminal circuit serves as an external output power supply, and the output terminal of the output voltage regulator circuit serves as a regulated output power supply.

[0012] Further, the output circuit includes capacitor C11, diode D7, output series resistor, capacitor E4, output parallel resistor, diode D10, diode D9, resistor R26, resistor R34, capacitor C16, optocoupler U7, resistor R35, relay K1, NPN transistor Q3, resistor R25, resistor R29, and capacitor C14. One end of the first output terminal of the transformer circuit is connected to one end of the output series resistor and the positive terminal of diode D7. The other end of the output series resistor is connected to one end of capacitor C11. The other end of capacitor C11 is connected to the negative terminal of diode D7, one end of capacitor E4, one end of the output parallel resistor, and the positive terminal of diode D10. The other end of the output parallel resistor is grounded. The other end of capacitor E4 and the other end of the first output terminal of the transformer circuit are grounded. The negative terminal of diode D10 is connected to the positive terminal of diode D9 and the positive terminal of the external output power supply. The negative terminal of diode D9 is connected to one end of resistor R26. Resistor R26... 6. The other end is connected to the "1" terminal of the optocoupler U7, one end of the resistor R34, and one end of the capacitor C16. The "2" terminal of the optocoupler U7 is connected to the other end of the resistor R34 and the other end of the capacitor C16. The "4" terminal of the optocoupler U7 is connected to one end of the second output terminal of the transformer circuit. The "3" terminal of the optocoupler U7 is connected to one end of the resistor R35. The other end of the resistor R35 is connected to the base of the NPN transistor Q3. The emitter of the NPN transistor Q3 is grounded. The collector of the NPN transistor Q3 is connected to the "4" terminal of the relay K1. The "3" terminal of the relay K1 is connected to the "4" terminal of the optocoupler U7. The other end of the resistor R29 is connected to one end of the capacitor C14. The other end of the capacitor C14 is grounded. One end of the resistor R25 is connected to the "1" terminal of the relay K1. The "2" terminal of the relay K1 is connected to one end of the resistor R29. The other end of the resistor R25 is grounded. One end of the resistor R29 is connected to the negative terminal of the external output power supply.

[0013] Furthermore, the output series resistor is selected as a series connection of resistors R39, R40, and R41.

[0014] Furthermore, the output parallel resistors are selected from the parallel connection of resistors R27, R31, R36, R37 and R38.

[0015] Furthermore, the output voltage regulator circuit includes a resistor R45, a diode D8, a capacitor E3, a Zener diode U6, and a capacitor E5. One end of the second output terminal of the transformer circuit is connected to the positive terminal of the diode D8, and the other end of the second output terminal of the transformer circuit is grounded. The negative terminal of the diode D8 is connected to one end of the capacitor E3, one end of the resistor R45, and terminal "1" of the Zener diode U6. Terminal "2" of the Zener diode U6 is grounded. Terminal "3" of the Zener diode U6 is connected to one end of the capacitor E5. The other end of the capacitor E5 is grounded, and the other end of the capacitor E3 is grounded. The other end of the resistor R45 is connected to the positive terminal of the external output power supply.

[0016] Furthermore, the PWM control circuit includes a chip control circuit and an output control circuit. The input terminal of the chip control circuit is connected to one input terminal of the transformer circuit, the output terminal of the chip control circuit is connected to the control terminal of the output control circuit, the feedback terminal of the chip control circuit is connected to the feedback terminal of the feedback voltage circuit, and the input terminal of the output control circuit is connected to the other input terminal of the transformer circuit.

[0017] Further, the chip control circuit includes resistor R4, capacitors C3, C4, C2, C5, E2, resistor R30, resistor R1, resistor R3, diode D2, and chip U1. Terminal "1" of chip U1 is connected to one end of capacitor C5, and the other end of capacitor C5 is grounded. Terminal "2" of chip U1 is grounded. Terminal "3" of chip U1 is connected to a control terminal of the output control circuit. Terminal "4" of chip U1 is connected to one end of capacitor C4 and one end of resistor R4. The other end of resistor R4 is connected to terminal "8" of chip U1 and one end of capacitor C3. The other end of capacitor C3... The other end of capacitor C4 is grounded. Terminal 5 of chip U1 is grounded. Terminal 6 of chip U1 is connected to another control terminal of the output control circuit. Terminal 7 of chip U1 is connected to one end of capacitor C2 and one end of resistor R30. The other end of capacitor C2 is grounded. The other end of resistor R30 is connected to one end of capacitor E2, the negative terminal of diode D2, and one end of resistor R1. The other end of resistor R1 is connected to one input terminal of the transformer circuit. The positive terminal of diode D2 is connected to one end of resistor R3. The other end of resistor R3 is connected to one third output terminal of the transformer circuit. The other end of capacitor E2 is grounded.

[0018] Furthermore, the output control circuit includes resistors R5 and R6, diode D11, NMOS transistor Q1, resistor R7, capacitor C6, resistor R8, and capacitor C18. Terminal "6" of chip U1 is connected to one end of resistor R5 and the negative terminal of diode D11. The other end of resistor R5 and the positive terminal of diode D11 are connected to the gate of NMOS transistor Q1. The drain of NMOS transistor Q1 is connected to the other end of the input terminal of the transformer circuit. The source of NMOS transistor Q1 is connected to one end of resistor R8, one end of capacitor C18, and one end of resistor R6. The other end of resistor R6 is connected to terminal "3" of chip U1 and one end of capacitor C6. The other ends of capacitor C6, resistor R7, capacitor C18, and resistor R8 are all grounded. One end of resistor R7 is connected to the gate of NMOS transistor Q1.

[0019] Further, the feedback voltage circuit includes optocoupler U2, resistors R9 and R46, Zener diode U3, resistor R10, capacitors C7 and C17, diode D3, resistors R32, R11, R15, R14, R13, R12, NC2, diode D4, amplifier U5, capacitor C15, resistors R23, R24, R22, capacitor C12, diode D6, resistor R21, thermistor NTC3, capacitor C13, NPN transistor Q2, resistors R17 and R33, Zener diode Z1, amplifier U55, capacitors C10 and C9, resistors R16, R20, R18, and R19, and the PWM control circuit. The feedback terminal is connected to terminal "4" of the optocoupler U2. Terminal "3" of the optocoupler U2 is grounded. Terminal "1" of the optocoupler U2 is connected to one end of resistor R9 and one end of resistor R46. The other end of resistor R9 is connected to an external DC power supply. The other end of resistor R46 is connected to the positive terminal of diode D4, terminal "2" of optocoupler U2, one end of resistor R10, and terminal "3" of Zener diode U3. Terminal "2" of Zener diode U3 is grounded. Terminal "1" of Zener diode U3 is connected to one end of capacitor C17, one end of capacitor C7, one end of resistor R11, one end of resistor R14, and one end of resistor R15. The other end of resistor R10 is connected to the other end of capacitor C7. The other ends of capacitor C17 and resistor R15 are grounded together. 11. The other end of resistor R14 is connected to the positive terminal of diode D3. The negative terminal of diode D3 is connected to one end of resistor R32. The other end of resistor R32 is connected to the microcontroller control circuit. The other end of resistor R14 is connected to one end of resistor R13. The other end of resistor R13 is connected to one end of resistor R12 and one end of resistor NC2. The other ends of resistor R12 and NC2 are connected to a common DC power supply. The negative terminal of diode D4 is connected to terminal 1 of amplifier U5. Terminal 8 of amplifier U5 is connected to one end of capacitor C15 and the DC power supply. The other end of capacitor C15 is grounded. Terminal 4 of amplifier U5 is grounded. Terminal 2 of amplifier U5 is connected to one end of capacitor C12, the negative terminal of diode D6, and one end of resistor R22. Terminal 3 of amplifier U5... The terminals are connected to one end of resistor R23 and one end of resistor R24. The other end of resistor R24 ​​is grounded. The other end of resistor R23 is connected to the DC power supply. The other end of capacitor C12 is grounded. The anode of diode D6 is connected to one end of resistor R21, one end of thermistor NTC3, and one end of capacitor C13. The other end of capacitor C13 and the other end of resistor R21 are grounded together. The other end of thermistor NTC3 is connected to the DC power supply. The other end of resistor R22 is connected to one end of resistor R16. The other end of resistor R16 is connected to one end of capacitor C9 and terminal 5 of amplifier U55. The other end of capacitor C9 is grounded. Terminal 6 of amplifier U55 is connected to one end of capacitor C10. The other end of capacitor C10 is connected to terminal 7 of amplifier U55, one end of resistor R17, and one end of resistor R33.The other end of resistor R33 is connected to the negative terminal of Zener diode Z1, and the positive terminal of Zener diode Z1 is grounded. The other end of resistor R17 is connected to the base of NPN transistor Q2, the emitter of NPN transistor Q2 is grounded, and the collector of NPN transistor Q2 is connected to the DC power supply. Terminal "6" of amplifier U55 is connected to one end of resistor R20, one end of resistor R19, and one end of resistor R18. The other end of resistor R18 is grounded, the other end of resistor R20 is connected to the DC power supply, and the other end of resistor R19 is connected to the microcontroller control circuit.

[0020] Further, the input rectifier and filter circuit includes a fuse F1, a thermistor N1, a varistor VR1, a capacitor CX1, a mutual inductor L1, a rectifier bridge DP1, and a capacitor E1. One end of the fuse F1 is connected to the live wire of the AC power supply, and the other end of the fuse F1 is connected to one end of the thermistor N1. The other end of the thermistor N1 is connected to one end of the varistor VR1, one end of the capacitor CX1, and the "4" terminal of the mutual inductor L1. The "3" terminal of the mutual inductor L1 is connected to the "3" terminal of the rectifier bridge DP1. The "1" terminal of the mutual inductor L1 is connected to the other end of the varistor VR1, the other end of the capacitor CX1, and the neutral wire of the AC power supply. The "2" terminal of the mutual inductor L1 is connected to the "1" terminal of the rectifier bridge DP1. The "2" terminal of the rectifier bridge DP1 is grounded. The "4" terminal of the rectifier bridge DP1 is connected in parallel to one end of the capacitor E1 and one end of the input terminal of the transformer circuit. The other end of the capacitor E1 is grounded.

[0021] Furthermore, the transformer circuit includes a transformer T1, resistors R2, R42, R43, and R44, a capacitor C1, and a diode D1. The "3" terminal of the transformer T1 is connected to one end of resistors R2, R42, R43, and R44, one end of capacitor C1, and the output terminal of the input rectifier and filter circuit. The other ends of resistors R2, R42, R43, and R44, and the other end of capacitor C1 are all connected to the negative terminal of diode D1. The positive terminal of diode D1 is connected to the other end of the input terminal of the transformer circuit.

[0022] Furthermore, the microcontroller control circuit includes a capacitor C8 and a chip U4. The "1" terminal of the chip U4 is connected to a DC power supply and one end of the capacitor C8, while the other end of the capacitor C8 is grounded.

[0023] Furthermore, the indicator circuit includes LED1 and resistor R28. The positive terminal of LED1 is connected to the output terminal of the microcontroller control circuit, and the negative terminal of LED1 is connected to one end of resistor R28, while the other end of resistor R28 is grounded.

[0024] Furthermore, the chip U4 is selected as the SN8P2511 model chip.

[0025] Furthermore, a control method for a charging circuit based on a Maas-protected rechargeable battery is provided, the steps of which are as follows:

[0026] Step 1: Power supply circuit unit assembly

[0027] The circuit comprises a transformer circuit, an output power supply circuit, a microcontroller control circuit, a PWM control circuit, a feedback voltage circuit, and an indicator circuit. The output terminal of the input rectifier and filter circuit is connected to the input terminal of the transformer circuit and the input terminal of the PWM control circuit. The output terminal of the transformer circuit is connected to the input terminal of the output power supply circuit. The output terminal of the PWM control circuit is connected to the other end of the input terminal of the transformer circuit. The feedback terminal of the PWM control circuit is connected to the feedback terminal of the feedback voltage circuit. The control terminal of the feedback voltage circuit is connected to the control terminal of the microcontroller control circuit. The input terminal of the microcontroller control circuit is connected to the output terminal of the output power supply circuit. The output terminal of the microcontroller control circuit is connected to the input terminal of the indicator circuit. The output terminal of the output power supply circuit is connected to the input terminal of the output interface circuit.

[0028] Step 2: Parallel power supply circuit assembly

[0029] Select multiple power supply circuit units from step 1, connect their transformer circuit input terminals as a unified input terminal, connect their output power supply circuit output terminals as a unified output terminal, and connect the unified input terminal to the output terminal of the input rectifier and filter circuit.

[0030] Step 3: Charging circuit assembly

[0031] Select the parallel power supply circuit from step 2, as well as the input rectifier and filter circuit, the input interface, and the output interface circuit. Connect the input terminal of the input rectifier and filter circuit to the output terminal of the input interface, connect the output terminal of the input rectifier and filter circuit to the input terminal of the transformer circuit, and connect the output terminal of the output power supply circuit to the input terminal of the output interface circuit.

[0032] Beneficial effects

[0033] This invention, through a rational design of the charging circuit, employs an input interface circuit, a parallel power supply circuit, and an output interface circuit. Combined with an input rectifier and filter circuit, a transformer circuit, an output power supply circuit, a microcontroller control circuit, a PWM control circuit, a feedback voltage circuit, and an indicator circuit, it can achieve saturation charging of the battery. The cooperation between the microcontroller and the indicator circuit enables the display of the charging status. The coordination between the microcontroller, the PWM control circuit, the feedback voltage circuit, and the parallel power supply circuit allows for a charging curve that meets the ideal charging curve, effectively increasing battery life. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a charging circuit based on a Maas-protected rechargeable battery according to the present invention.

[0035] Figure 2 This is a schematic diagram of the power supply circuit unit of a charging circuit based on a Maas-protected rechargeable battery according to the present invention.

[0036] Figure 3 This is a schematic diagram of the power supply circuit unit of a charging circuit based on a Maas-protected rechargeable battery according to the present invention.

[0037] Figure 4 This is a schematic diagram of another power supply circuit unit of a charging circuit based on a Maas-protected rechargeable battery according to the present invention.

[0038] Figure 5 The IU curve is shown for a charging circuit based on a Maas-protected rechargeable battery according to the present invention.

[0039] Reference numerals: 01. Input rectifier and filter circuit; 02. Transformer circuit; 03. Output power supply circuit; 04. Microcontroller control circuit; 05. PWM control circuit; 06. Indicator circuit; 07. Feedback voltage circuit; 1. Input interface circuit; 2. First power supply circuit; 3. Output interface circuit; 4. Second power supply circuit; 5. Nth power supply circuit. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] See Figures 1-4 As shown, the present invention provides a charging circuit and control method based on a Maas-protected rechargeable battery. The charging circuit includes: an input interface circuit 1, a parallel power supply circuit, and an output interface circuit 3. The input terminal of the input interface circuit 1 is connected to an external AC power supply, the output terminal of the input interface circuit 1 is connected to the input terminal of the parallel power supply circuit, the output terminal of the parallel power supply circuit is connected to the input terminal of the output interface circuit 3, and the output terminal of the output interface circuit 3 is connected to an external battery.

[0042] The parallel power supply circuit includes at least three power supply circuit units connected in parallel, specifically: the first power supply circuit 2, the second power supply circuit 4, and the Nth power supply circuit 5 (N=3);

[0043] The input interface circuit includes an input interface and an input rectifier and filter circuit. The output terminal of the input interface is connected to the input terminal of the rectifier and filter circuit 01.

[0044] The power supply circuit unit includes a transformer circuit 02, an output power supply circuit 03, a microcontroller control circuit 04, a PWM control circuit 05, a feedback voltage circuit 07, and an indicator circuit 06. The output terminal of the input rectifier and filter circuit 01 is connected to the input terminal of the transformer circuit 02 and the input terminal of the PWM control circuit 05. The output terminal of the transformer circuit 02 is connected to the input terminal of the output power supply circuit 03. The output terminal of the PWM control circuit 05 is connected to the other end of the input terminal of the transformer circuit 02. The feedback terminal of the PWM control circuit 05 is connected to the feedback terminal of the feedback voltage circuit 07. The control terminal of the feedback voltage circuit 07 is connected to the control terminal of the microcontroller control circuit 04. The input terminal of the microcontroller control circuit 04 is connected to the output terminal of the output power supply circuit 03. The output terminal of the microcontroller control circuit 04 is connected to the input terminal of the indicator circuit 06. The output terminal of the output power supply circuit 03 is connected to the input terminal of the output interface circuit.

[0045] The output power supply circuit 03 includes an output voltage regulator circuit and an output terminal circuit. The input terminal of the output terminal circuit and the input terminal of the output voltage regulator circuit are respectively connected to the output terminal of the transformer circuit 02. The output terminal of the output terminal circuit serves as an external output power supply, and the output terminal of the output voltage regulator circuit serves as a regulated output power supply. The PWM control circuit 05 includes a chip control circuit and an output control circuit. The input terminal of the chip control circuit is connected to one end of the input terminal of the transformer circuit 02, the output terminal of the chip control circuit is connected to the control terminal of the output control circuit, the feedback terminal of the chip control circuit is connected to the feedback terminal of the feedback voltage circuit 07, and the input terminal of the output control circuit is connected to the other end of the input terminal of the transformer circuit 02.

[0046] The input rectifier and filter circuit 01 includes a fuse F1, a thermistor N1, a varistor VR1, a capacitor CX1, a mutual inductor L1, a rectifier bridge DP1, and a capacitor E1; the transformer circuit 02 includes a transformer T1, resistors R2, R42, R43, and R44, a capacitor C1, and a diode D1; the chip control circuit includes a resistor R4, capacitors C3, C4, C2, C5, and E2, resistors R30, R1, and R3, a diode D2, and a chip U1. The output control circuit includes resistors R5 and R6, diode D11, NMOS transistor Q1, resistor R7, capacitor C6, resistor R8, and capacitor C18; the feedback voltage circuit 07 includes optocoupler U2, resistors R9 and R46, Zener diode U3, resistor R10, capacitors C7 and C17, diode D3, resistors R32, R11, R15, R14, R13, R12, resistor NC2, diode D4, amplifier U5, capacitor C15, and resistor... R23, R24, R22, C12, D6, R21, NTC3 thermistor, C13, Q2 NPN transistor, R17, R33, Z1 Zener diode, U55 amplifier, C10, C9, R16, R20, R18, and R19; the output circuit includes C11, D7, R39, R40, R41, E4, R27, R31, and... The circuit includes resistors R36, R37, R38, diodes D10 and D9, resistors R26 and R34, capacitor C16, optocoupler U7, resistor R35, relay K1, NPN transistor Q3, resistors R25 and R29, and capacitor C14; the output voltage regulator circuit includes resistor R45, diode D8, capacitor E3, Zener diode U6, and capacitor E5; the microcontroller control circuit 04 includes capacitor C8 and chip U4; the indicator circuit 06 includes LED1 and resistor R28; and capacitor CY1.

[0047] In the input rectifier and filter circuit 01, one end of fuse F1 is connected to the live wire of the AC power supply, and the other end of fuse F1 is connected to one end of the thermistor N1. The other end of the thermistor N1 is connected to one end of varistor VR1, one end of capacitor CX1, and the terminal of mutual inductor L1 "4". The terminal of mutual inductor L1 "3" is connected to the terminal of rectifier bridge DP1 "3". The terminal of mutual inductor L1 "1" is connected to the other end of varistor VR1, the other end of capacitor CX1, and the neutral wire of the AC power supply. The terminal of mutual inductor L1 "2" is connected to the terminal of rectifier bridge DP1 "1". The terminal of rectifier bridge DP1 "2" is grounded. The terminal of rectifier bridge DP1 "4" is connected in parallel to one end of capacitor E1 and one end of the input terminal of transformer circuit 02. The other end of capacitor E1 is grounded.

[0048] In the transformer circuit 02, the transformer T1 "3" terminal is connected to one end of resistor R2, one end of resistor R42, one end of resistor R43, one end of resistor R44, one end of capacitor C1, and the rectifier bridge DP1 "4" terminal of the input rectifier filter circuit 01. The other ends of resistor R2, resistor R42, resistor R43, resistor R44, and capacitor C1 are connected to the negative terminal of diode D1. The positive terminal of diode D1 is connected to the other end of the input terminal of transformer circuit 02.

[0049] In the chip control circuit, terminal 1 of chip U1 is connected to one end of capacitor C5, and the other end of capacitor C5 is grounded; terminal 2 of chip U1 is grounded; terminal 3 of chip U1 is connected to one end of resistor R6 in the output control circuit; terminal 4 of chip U1 is connected to one end of capacitor C4 and one end of resistor R4; the other end of resistor R4 is connected to terminal 8 of chip U1 and one end of capacitor C3; the other ends of capacitor C3 and capacitor C4 are grounded together; terminal 5 of chip U1 is grounded; terminal 6 of chip U1 is connected to one end of resistor R5 in the output control circuit; terminal 7 of chip U1 is connected to one end of capacitor C2 and one end of resistor R30; the other end of capacitor C2 is grounded; the other end of resistor R30 is connected to one end of capacitor E2, the negative terminal of diode D2 and one end of resistor R1; the other end of resistor R1 is connected to one end of the input terminal of transformer circuit 02; the positive terminal of diode D2 is connected to one end of resistor R3; the other end of resistor R3 is connected to one end of the third output terminal of transformer circuit 02; and the other end of capacitor E2 is grounded.

[0050] In the output control circuit, one end of resistor R5 is connected to terminal "6" of chip U1 and the negative terminal of diode D11. The other end of resistor R5 and the positive terminal of diode D11 are connected to the gate of NMOS transistor Q1. The drain of NMOS transistor Q1 is connected to the other end of the input terminal of transformer circuit 02. The source of NMOS transistor Q1 is connected to one end of resistor R8, one end of capacitor C18 and one end of resistor R6. The other end of resistor R6 is connected to terminal "3" of chip U1 and one end of capacitor C6. The other end of capacitor C6, the other end of resistor R7, the other end of capacitor C18 and the other end of resistor R8 are grounded together. One end of resistor R7 is connected to the gate of NMOS transistor Q1.

[0051] The feedback voltage circuit 07 includes an optocoupler U2, resistors R9 and R46, a Zener diode U3, resistor R10, capacitors C7 and C17, a diode D3, resistors R32, R11, R15, R14, R13, R12, resistor NC2, a diode D4, an amplifier U5, capacitor C15, resistors R23, R24, R22, capacitor C12, a diode D6, a resistor R21, a thermistor NTC3, a capacitor C13, an NPN transistor Q2, resistors R17 and R33, a Zener diode Z1, an amplifier U55, capacitors C10 and C9, resistors R16, R20, R18, and R19, and is the feedback terminal of the PWM control circuit 05. Connect the optocoupler U2 "4" terminal, the optocoupler U2 "3" terminal to ground, the optocoupler U2 "1" terminal to one end of resistor R9 and one end of resistor R46, the other end of resistor R9 to an external DC power supply, the other end of resistor R46 to the positive terminal of diode D4, the optocoupler U2 "2" terminal, one end of resistor R10 and the Zener diode U3 "3" terminal, the Zener diode U3 "2" terminal to ground, the Zener diode U3 "1" terminal to one end of capacitor C17, one end of capacitor C7, one end of resistor R11, one end of resistor R14 and one end of resistor R15, the other end of resistor R10 to the other end of capacitor C7, the other end of capacitor C17 and the other end of resistor R15 are grounded together, the other end of resistor R11 to the positive terminal of diode D3, the negative terminal of diode D3 to the first terminal of resistor R32. One end of resistor R32 is connected to the microcontroller control circuit 04. The other end of resistor R14 is connected to one end of resistor R13. The other end of resistor R13 is connected to one end of resistor R12 and one end of resistor NC2. The other ends of resistor R12 and NC2 are connected to a common DC power supply. The cathode of diode D4 is connected to terminal 1 of amplifier U5. Terminal 8 of amplifier U5 is connected to one end of capacitor C15 and the DC power supply. The other end of capacitor C15 is grounded. Terminal 4 of amplifier U5 is grounded. Terminal 2 of amplifier U5 is connected to one end of capacitor C12, the cathode of diode D6, and one end of resistor R22. Terminal 3 of amplifier U5 is connected to one end of resistor R23 and one end of resistor R24. The other end of resistor R24 ​​is grounded. The other end of resistor R23 is connected to the DC power supply. The other end of capacitor C12 is grounded. The anode of diode D6 is connected to one end of resistor R21, one end of thermistor NTC3, and one end of capacitor C13. The other end of capacitor C13 and the other end of resistor R21 are grounded together. The other end of thermistor NTC3 is connected to a DC power supply. The other end of resistor R22 is connected to one end of resistor R16. The other end of resistor R16 is connected to one end of capacitor C9 and terminal 5 of amplifier U55. The other end of capacitor C9 is grounded. Terminal 6 of amplifier U55 is connected to one end of capacitor C10. The other end of capacitor C10 is connected to terminal 7 of amplifier U55, one end of resistor R17, and one end of resistor R33. The other end of resistor R33 is connected to the cathode of Zener diode Z1. The anode of Zener diode Z1 is grounded. The other end of resistor R17 is connected to the base of NPN transistor Q2.The emitter of NPN transistor Q2 is grounded, and its collector is connected to a DC power supply. Amplifier U55's "6" terminal is connected to one end of resistors R20, R19, and R18. The other end of resistor R18 is grounded, the other end of resistor R20 is connected to the DC power supply, and the other end of resistor R19 is connected to the microcontroller control circuit 04.

[0052] The output circuit includes capacitor C11, diode D7, resistors R39, R40, and R41, capacitor E4, resistors R27, R31, R36, R37, and R38, diodes D10 and D9, resistors R26 and R34, capacitor C16, optocoupler U7, resistor R35, relay K1, NPN transistor Q3, resistors R25 and R29, and capacitor C14. One end of the first output terminal of transformer circuit 02 is connected to series resistors R39 / R40 / One end of resistor R41 is connected to the positive terminal of diode D7. The other end of series resistors R39 / R40 / R41 is connected to one end of capacitor C11. The other end of capacitor C11 is connected to the negative terminal of diode D7, one end of capacitor E4, and one end of resistor R27. One end of resistor R27 is connected to one end of resistors R31, R36, R37, and R38, and the positive terminal of diode D10. The other ends of resistors R27, R31, R36, R37, and R38 are grounded. Capacitor E4... 4. The other end of the transformer circuit 02 shares a common ground with the first output terminal. The cathode of diode D10 is connected to the anode of diode D9 and the positive terminal of the external output power supply. The cathode of diode D9 is connected to one end of resistor R26. The other end of resistor R26 is connected to terminal "1" of optocoupler U7, one end of resistor R34, and one end of capacitor C16. Terminal "2" of optocoupler U7 is connected to the other end of resistor R34 and the other end of capacitor C16. Terminal "4" of optocoupler U7 is connected to one end of the second output terminal of transformer circuit 02. Terminal "3" of optocoupler U7 is connected to resistor R35. One end of resistor R35 is connected to the base of NPN transistor Q3. The emitter of NPN transistor Q3 is grounded. The collector of NPN transistor Q3 is connected to terminal "4" of relay K1. Terminal "3" of relay K1 is connected to terminal "4" of optocoupler U7. The other end of resistor R29 is connected to one end of capacitor C14. The other end of capacitor C14 is grounded. One end of resistor R25 is connected to terminal "1" of relay K1. Terminal "2" of relay K1 is connected to one end of resistor R29. The other end of resistor R25 is grounded. One end of resistor R29 is connected to the negative terminal of the external output power supply.

[0053] The output voltage regulator circuit includes a resistor R45, a diode D8, a capacitor E3, a Zener diode U6, and a capacitor E5. One end of the second output terminal of the transformer circuit 02 is connected to the positive terminal of the diode D8, and the other end of the second output terminal of the transformer circuit 02 is grounded. The negative terminal of the diode D8 is connected to one end of the capacitor E3, one end of the resistor R45, and the "1" terminal of the Zener diode U6. The "2" terminal of the Zener diode U6 is grounded. The "3" terminal of the Zener diode U6 is connected to one end of the capacitor E5. The other end of the capacitor E5 is grounded, the other end of the capacitor E3 is grounded, and the other end of the resistor R45 is connected to the positive terminal of the external output power supply.

[0054] The microcontroller control circuit 04 includes a capacitor C8 and a chip U4. The "1" terminal of the chip U4 is connected to a DC power supply and one end of the capacitor C8, while the other end of the capacitor C8 is grounded.

[0055] The indicator circuit 06 includes LED1 and resistor R28. The positive terminal of LED1 is connected to the output terminal of the microcontroller control circuit 04, the negative terminal of LED1 is connected to one end of resistor R28, and the other end of resistor R28 is grounded.

[0056] Among them, the two ends of capacitor CY1 are connected to signal ground and ground, respectively.

[0057] Specifically, chip U4 is an SN8P2511 chip. Chip U1 is a UC3845 chip. Chip U6 is a 78L05 chip. Optocoupler U2 is an 817C optocoupler. Rectifier bridge DP1 is a BP410G rectifier bridge.

[0058] One method for controlling a charging circuit based on a Maas-protected rechargeable battery includes the following steps:

[0059] Step 1: Power supply circuit unit assembly

[0060] The circuit comprises a transformer circuit, an output power supply circuit, a microcontroller control circuit, a PWM control circuit, a feedback voltage circuit, and an indicator circuit. The output terminal of the input rectifier and filter circuit is connected to the input terminal of the transformer circuit and the input terminal of the PWM control circuit. The output terminal of the transformer circuit is connected to the input terminal of the output power supply circuit. The output terminal of the PWM control circuit is connected to the other end of the input terminal of the transformer circuit. The feedback terminal of the PWM control circuit is connected to the feedback terminal of the feedback voltage circuit. The control terminal of the feedback voltage circuit is connected to the control terminal of the microcontroller control circuit. The input terminal of the microcontroller control circuit is connected to the output terminal of the output power supply circuit. The output terminal of the microcontroller control circuit is connected to the input terminal of the indicator circuit. The output terminal of the output power supply circuit is connected to the input terminal of the output interface circuit.

[0061] Step 2: Parallel power supply circuit assembly

[0062] Select multiple power supply circuit units from step 1, connect their transformer circuit input terminals as a unified input terminal, connect their output power supply circuit output terminals as a unified output terminal, and connect the unified input terminal to the output terminal of the input rectifier and filter circuit.

[0063] Step 3: Charging circuit assembly

[0064] Select the parallel power supply circuit from step 2, as well as the input rectifier and filter circuit, the input interface, and the output interface circuit. Connect the input terminal of the input rectifier and filter circuit to the output terminal of the input interface, connect the output terminal of the input rectifier and filter circuit to the input terminal of the transformer circuit, and connect the output terminal of the output power supply circuit to the input terminal of the output interface circuit.

[0065] See Figure 5 As shown, the charging circuit of the parallel power supply circuit designed by this invention can achieve the ideal charging curve of the Maas, and can better saturate charge the battery.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A charging circuit based on a Maas-protected rechargeable battery, characterized in that, The charging circuit includes an input interface circuit, a parallel power supply circuit, and an output interface circuit. The input terminal of the input interface circuit is connected to an external AC power supply, the output terminal of the input interface circuit is connected to the input terminal of the parallel power supply circuit, the output terminal of the parallel power supply circuit is connected to the input terminal of the output interface circuit, and the output terminal of the output interface circuit is connected to an external battery. The parallel power supply circuit includes at least three power supply circuit units connected in parallel. The input interface circuit includes an input interface and an input rectifier and filter circuit, wherein the output terminal of the input interface is connected to the input terminal of the rectifier and filter circuit; The power supply circuit unit includes a transformer circuit, an output power supply circuit, a microcontroller control circuit, a PWM control circuit, a feedback voltage circuit, and an indicator circuit. The output terminal of the input rectifier and filter circuit is connected to the input terminal of the transformer circuit and the input terminal of the PWM control circuit. The output terminal of the transformer circuit is connected to the input terminal of the output power supply circuit. The output terminal of the PWM control circuit is connected to the other end of the input terminal of the transformer circuit. The feedback terminal of the PWM control circuit is connected to the feedback terminal of the feedback voltage circuit. The control terminal of the feedback voltage circuit is connected to the control terminal of the microcontroller control circuit. The input terminal of the microcontroller control circuit is connected to the output terminal of the output power supply circuit. The output terminal of the microcontroller control circuit is connected to the input terminal of the indicator circuit. The output terminal of the output power supply circuit is connected to the input terminal of the output interface circuit.

2. The charging circuit based on a Maas-protected rechargeable battery according to claim 1, characterized in that, The output power supply circuit includes an output voltage regulator circuit and an output terminal circuit. The input terminal of the output terminal circuit and the input terminal of the output voltage regulator circuit are respectively connected to the output terminal of the transformer circuit. The output terminal of the output terminal circuit serves as an external output power supply, and the output terminal of the output voltage regulator circuit serves as a regulated output power supply.

3. The charging circuit based on a Maas-protected rechargeable battery according to claim 2, characterized in that, The output circuit includes capacitor C11, diode D7, output series resistor, capacitor E4, output parallel resistor, diode D10, diode D9, resistor R26, resistor R34, capacitor C16, optocoupler U7, resistor R35, relay K1, NPN transistor Q3, resistor R25, resistor R29, and capacitor C14. One end of the first output terminal of the transformer circuit is connected to one end of the output series resistor and the positive terminal of diode D7. The other end of the output series resistor is connected to one end of capacitor C11. The other end of capacitor C11 is connected to the negative terminal of diode D7, one end of capacitor E4, one end of the output parallel resistor, and the positive terminal of diode D10. The other end of the output parallel resistor is grounded. The other end of capacitor E4 and the other end of the first output terminal of the transformer circuit are grounded. The negative terminal of diode D10 is connected to the positive terminal of diode D9 and the positive terminal of the external output power supply. The negative terminal of diode D9 is connected to one end of resistor R26. The other end of resistor R26... The optocoupler U7"1 terminal is connected to one end of resistor R34 and one end of capacitor C16. The optocoupler U7"2 terminal is connected to the other end of resistor R34 and capacitor C16. The optocoupler U7"4 terminal is connected to one end of the second output terminal of the transformer circuit. The optocoupler U7"3 terminal is connected to one end of resistor R35. The other end of resistor R35 is connected to the base of NPN transistor Q3. The emitter of NPN transistor Q3 is grounded. The collector of NPN transistor Q3 is connected to the "4" terminal of relay K1. The relay K1"3 terminal is connected to the optocoupler U7"4 terminal. The other end of resistor R29 is connected to one end of capacitor C14. The other end of capacitor C14 is grounded. One end of resistor R25 is connected to the "1" terminal of relay K1. The "2" terminal of relay K1 is connected to one end of resistor R29. The other end of resistor R25 is grounded. One end of resistor R29 is connected to the negative terminal of the external output power supply.

4. The charging circuit and control method based on a Maas-protected rechargeable battery according to claim 2, characterized in that, The output voltage regulator circuit includes a resistor R45, a diode D8, a capacitor E3, a Zener diode U6, and a capacitor E5. One end of the second output terminal of the transformer circuit is connected to the positive terminal of the diode D8, and the other end of the second output terminal of the transformer circuit is grounded. The negative terminal of the diode D8 is connected to one end of the capacitor E3, one end of the resistor R45, and the "1" terminal of the Zener diode U6. The "2" terminal of the Zener diode U6 is grounded. The "3" terminal of the Zener diode U6 is connected to one end of the capacitor E5, and the other end of the capacitor E5 is grounded. The other end of the capacitor E3 is grounded. The other end of the resistor R45 is connected to the positive terminal of the external output power supply.

5. A charging circuit based on a Maas-protected rechargeable battery according to claim 1, characterized in that, The PWM control circuit includes a chip control circuit and an output control circuit. The input terminal of the chip control circuit is connected to one input terminal of the transformer circuit, the output terminal of the chip control circuit is connected to the control terminal of the output control circuit, the feedback terminal of the chip control circuit is connected to the feedback terminal of the feedback voltage circuit, and the input terminal of the output control circuit is connected to the other input terminal of the transformer circuit.

6. A charging circuit based on a Maas-protected rechargeable battery according to claim 5, characterized in that, The chip control circuit includes resistor R4, capacitors C3, C4, C2, C5, E2, resistor R30, resistor R1, resistor R3, diode D2, and chip U1. Terminal "1" of chip U1 is connected to one end of capacitor C5, and the other end of capacitor C5 is grounded. Terminal "2" of chip U1 is grounded. Terminal "3" of chip U1 is connected to a control terminal of the output control circuit. Terminal "4" of chip U1 is connected to one end of capacitor C4 and one end of resistor R4. The other end of resistor R4 is connected to terminal "8" of chip U1 and one end of capacitor C3. The other end of capacitor C3 is connected to... The other end of C4 is grounded. The "5" terminal of chip U1 is grounded. The "6" terminal of chip U1 is connected to another control terminal of the output control circuit. The "7" terminal of chip U1 is connected to one end of capacitor C2 and one end of resistor R30. The other end of capacitor C2 is grounded. The other end of resistor R30 is connected to one end of capacitor E2, the negative terminal of diode D2, and one end of resistor R1. The other end of resistor R1 is connected to one input terminal of the transformer circuit. The positive terminal of diode D2 is connected to one end of resistor R3. The other end of resistor R3 is connected to one third output terminal of the transformer circuit. The other end of capacitor E2 is grounded.

7. A charging circuit based on a Maas-protected rechargeable battery according to claim 6, characterized in that, The output control circuit includes resistors R5 and R6, diode D11, NMOS transistor Q1, resistor R7, capacitor C6, resistor R8, and capacitor C18. The "6" terminal of chip U1 is connected to one end of resistor R5 and the negative terminal of diode D11. The other end of resistor R5 and the positive terminal of diode D11 are connected to the gate of NMOS transistor Q1. The drain of NMOS transistor Q1 is connected to the other end of the input terminal of the transformer circuit. The source of NMOS transistor Q1 is connected to one end of resistor R8, one end of capacitor C18, and one end of resistor R6. The other end of resistor R6 is connected to the "3" terminal of chip U1 and one end of capacitor C6. The other ends of capacitor C6, resistor R7, capacitor C18, and resistor R8 are all grounded. One end of resistor R7 is connected to the gate of NMOS transistor Q1.

8. The charging circuit and control method of the rechargeable battery based on the Maas protection system according to claim 1, characterized in that, The feedback voltage circuit includes optocoupler U2, resistors R9 and R46, Zener diode U3, resistor R10, capacitors C7 and C17, diode D3, resistors R32, R11, R15, R14, R13, R12, NC2, diode D4, amplifier U5, capacitor C15, resistors R23, R24, R22, capacitor C12, diode D6, resistor R21, thermistor NTC3, capacitor C13, NPN transistor Q2, resistors R17 and R33, Zener diode Z1, amplifier U55, capacitors C10 and C9, resistors R16, R20, R18, and R19. The feedback terminal of the PWM control circuit... Connect the optocoupler U2"4 terminal, ground the optocoupler U2"3 terminal, connect the optocoupler U2"1 terminal to one end of resistor R9 and one end of resistor R46, connect the other end of resistor R9 to an external DC power supply, connect the other end of resistor R46 to the positive terminal of diode D4, the optocoupler U2"2 terminal, one end of resistor R10, and the Zener diode U3"3 terminal, ground the Zener diode U3"2 terminal, connect the Zener diode U3"1 terminal to one end of capacitor C17, one end of capacitor C7, one end of resistor R11, one end of resistor R14, and one end of resistor R15, connect the other end of resistor R10 to the other end of capacitor C7, and ground the other ends of capacitor C17 and resistor R15 together, and connect the other end of resistor R11... One end of resistor R14 is connected to the anode of diode D3. The cathode of diode D3 is connected to one end of resistor R32. The other end of resistor R32 is connected to the microcontroller control circuit. The other end of resistor R14 is connected to one end of resistor R13. The other end of resistor R13 is connected to one end of resistor R12 and one end of resistor NC2. The other ends of resistor R12 and NC2 are connected to a common DC power supply. The cathode of diode D4 is connected to terminal U5"1 of amplifier. Terminal U5"8 of amplifier is connected to one end of capacitor C15 and the DC power supply. The other end of capacitor C15 is grounded. Terminal U5"4 of amplifier is grounded. Terminal U5"2 of amplifier is connected to one end of capacitor C12, the cathode of diode D6, and one end of resistor R22. Terminal U5"3 of amplifier... Connect one end of resistor R23 and one end of resistor R24. The other end of resistor R24 ​​is grounded. The other end of resistor R23 is connected to a DC power supply. The other end of capacitor C12 is grounded. The anode of diode D6 is connected to one end of resistor R21, one end of thermistor NTC3, and one end of capacitor C13. The other end of capacitor C13 and the other end of resistor R21 are grounded together. The other end of thermistor NTC3 is connected to a DC power supply. The other end of resistor R22 is connected to one end of resistor R16. The other end of resistor R16 is connected to one end of capacitor C9 and the "5" terminal of amplifier U55. The other end of capacitor C9 is grounded. The "6" terminal of amplifier U55 is connected to one end of capacitor C10. The other end of capacitor C10 is connected to the "7" terminal of amplifier U55, one end of resistor R17, and one end of resistor R33.The other end of resistor R33 is connected to the negative terminal of Zener diode Z1, and the positive terminal of Zener diode Z1 is grounded. The other end of resistor R17 is connected to the base of NPN transistor Q2, the emitter of NPN transistor Q2 is grounded, and the collector of NPN transistor Q2 is connected to the DC power supply. Terminal "6" of amplifier U55 is connected to one end of resistors R20, R19, and R18. The other end of resistor R18 is grounded, the other end of resistor R20 is connected to the DC power supply, and the other end of resistor R19 is connected to the microcontroller control circuit.

9. A charging circuit based on a Maas-protected rechargeable battery according to claim 1, characterized in that, The input rectifier and filter circuit includes a fuse F1, a thermistor N1, a varistor VR1, a capacitor CX1, a mutual inductor L1, a rectifier bridge DP1, and a capacitor E1. One end of the fuse F1 is connected to the live wire of the AC power supply, and the other end of the fuse F1 is connected to one end of the thermistor N1. The other end of the thermistor N1 is connected to one end of the varistor VR1, one end of the capacitor CX1, and the "4" terminal of the mutual inductor L1. The "3" terminal of the mutual inductor L1 is connected to the "3" terminal of the rectifier bridge DP1. The "1" terminal of the mutual inductor L1 is connected to the other end of the varistor VR1, the other end of the capacitor CX1, and the neutral wire of the AC power supply. The "2" terminal of the mutual inductor L1 is connected to the "1" terminal of the rectifier bridge DP1. The "2" terminal of the rectifier bridge DP1 is grounded. The "4" terminal of the rectifier bridge is connected in parallel to one end of the capacitor E1 and one end of the input terminal of the transformer circuit. The other end of the capacitor E1 is grounded.

10. A control method for a charging circuit based on a Maas-protected rechargeable battery, characterized in that, The control method steps are as follows: Step 1: Power supply circuit unit assembly The circuit comprises a transformer circuit, an output power supply circuit, a microcontroller control circuit, a PWM control circuit, a feedback voltage circuit, and an indicator circuit. The output terminal of the input rectifier and filter circuit is connected to the input terminal of the transformer circuit and the input terminal of the PWM control circuit. The output terminal of the transformer circuit is connected to the input terminal of the output power supply circuit. The output terminal of the PWM control circuit is connected to the other end of the input terminal of the transformer circuit. The feedback terminal of the PWM control circuit is connected to the feedback terminal of the feedback voltage circuit. The control terminal of the feedback voltage circuit is connected to the control terminal of the microcontroller control circuit. The input terminal of the microcontroller control circuit is connected to the output terminal of the output power supply circuit. The output terminal of the microcontroller control circuit is connected to the input terminal of the indicator circuit. The output terminal of the output power supply circuit is connected to the input terminal of the output interface circuit. Step 2: Parallel power supply circuit assembly Select multiple power supply circuit units from step 1, connect their transformer circuit input terminals as a unified input terminal, connect their output power supply circuit output terminals as a unified output terminal, and connect the unified input terminal to the output terminal of the input rectifier and filter circuit. Step 3: Charging circuit assembly Select the parallel power supply circuit from step 2, as well as the input rectifier and filter circuit, the input interface, and the output interface circuit. Connect the input terminal of the input rectifier and filter circuit to the output terminal of the input interface, connect the output terminal of the input rectifier and filter circuit to the input terminal of the transformer circuit, and connect the output terminal of the output power supply circuit to the input terminal of the output interface circuit.

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