Power supply circuit of main transformer integrated board

Abstract

The main transformer integrated board power supply circuit comprises a reactor LL1, a common mode inductor LL3, a fourth resistor R4, a rectifier DB1, a first filter capacitor E1, a third filter capacitor E3, a switch relay RY1, an anti-backflow diode D3, a fifth resistor R5, a second filter capacitor E2 and a switch power supply. A live wire L2 of the commercial power 110VAC voltage is connected in series with a reactor LL1 and then is connected in series with a common mode inductor LL3, a fourth resistor R4 is connected in series between a null line N and a null line N2 of the commercial power 110VAC voltage, two output ends of a rectifier DB1 are connected to a VBus end and a grounding end, and a first filter capacitor E1 and a third filter capacitor E3 are connected in series between the VBus end and the grounding end; a first diode D1, a second diode D2 and a fifth resistor R5 are connected in series between a live wire L of the commercial power 110VAC voltage and the switching power supply, a VBus end is connected in series with a third diode D3, the third diode D3 is connected in series to a wire between the second diode D2 and a fourth resistor R4, one end of a second filter capacitor E2 is connected to the grounding end, and the other end of the second filter capacitor E2 is connected to the fifth resistor R5 and the switching power supply.

Description

Technical field:

[0001] The utility model relates to a main transformer integrated board power supply circuit, wherein the main transformer integrated board power supply circuit can adapt to 110VAC mains power supply, and belongs to the technical field of household appliances such as washing machines and clothes dryers. Background technology:

[0002] At present, there are two common solutions for variable frequency washing machine computer boards in the foreign 110VAC market:

[0003] The main display integrated solution is to integrate the main board and display board that control the water valve, water pump and other electrical components into an integrated board, and then add a set of frequency conversion boards to control the motor. The main display integrated solution has poor overall safety performance, the computer board is easy to burn out, the whole machine has a high defect rate, and it is difficult to expand the model development.

[0004] The main transformer integrated solution is to integrate the main board and the motor frequency conversion board into an integrated board, and then add a display board. The computer board of this solution is a traditional voltage doubler rectifier circuit, which rectifies the 110VAC voltage through a full-bridge and then doubles the voltage to become direct current for each module. The computer board structure of the main transformer integrated solution is relatively complex, the computer board is large in size, the standby power consumption is high, and the cost is high.

[0005] Therefore, it is necessary to improve the existing technology to solve the shortcomings of the existing technology. Utility model content:

[0006] The utility model provides a main transformer integrated board power supply circuit in order to solve the problems existing in the above-mentioned prior art.

[0007] The utility model adopts the following technical scheme: a main transformer integrated board power supply circuit, including a reactance LL1, a common mode inductor LL3, a fourth resistor R4, a rectifier DB1, a first filter capacitor E1, a third filter capacitor E3, a switch relay RY1, an anti-backflow diode D3, a fifth resistor R5, a second filter capacitor E2 and a switch power supply;

[0008] The live wire L2 of the mains voltage of 110VAC is connected in series with the inductor LL1 and then connected in series with the common-mode inductor LL3. A fourth resistor R4 is connected in series between the neutral wire N of the mains voltage of 110VAC and the neutral wire N2. The switch relay RY1 is connected in parallel to the fourth resistor R4. The common-mode inductor LL3 is connected to the two input terminals of the rectifier DB1 through wires. The two output terminals of the rectifier DB1 are respectively connected to the VBus terminal and the ground terminal through wires. The first filter capacitor E1 and the third filter capacitor E3 are connected in series between the VBus terminal and the ground terminal. The wire connected to one of the output terminals of the common-mode inductor LL3 is connected between the first filter capacitor E1 and the third filter capacitor E3.

[0009] A first diode D1, a second diode D2 and a fifth resistor R5 are connected in series between the live wire L of the mains 110VAC voltage and the switching power supply, a third diode D3 is connected in series at the VBus end, and the third diode D3 is connected in series to a wire between the second diode D2 and the fourth resistor R4 through a wire, one end of the second filter capacitor E2 is connected to the ground terminal through a wire, and the other end is connected to the fifth resistor R5 and the switching power supply through a wire.

[0010] Furthermore, it also includes a varistor Z1, a first capacitor C1, a first resistor R1, a second resistor R2 and a third resistor R3. The first resistor R1, the second resistor R2 and the third resistor R3 are connected in series and connected in parallel with the varistor Z1 and the first capacitor C1 between the live wire L and the neutral wire N of the mains voltage of 110VAC.

[0011] Furthermore, a second capacitor C2 is connected in parallel between the common mode inductor LL3 and the rectifier DB1.

[0012] Furthermore, the third diode D3 is an anti-backflow diode D3.

[0013] The utility model has the following beneficial effects:

[0014] (1) Compared with the traditional 110VAC computer board solution, the main transformer integrated board power supply circuit of the utility model improves the safety of the whole machine, reduces the standby power consumption, and the high-power components of the computer board are not powered in the standby state, which reduces the probability of damage.

[0015] (2) In the standby state, the computer board of the washing machine of the utility model is a half-bridge rectifier to supply DC power, and the washing machine can operate normally. After starting to run, the door lock switch of the washing machine is closed, and the computer board becomes a full-bridge rectifier, and then supplies DC power with a voltage of 2 times. Since the switching power supply can adapt to a wide voltage supply, the entire system can work normally. The two circuit parts of the utility model complement each other, thereby ensuring that the circuit board works stably. Description of the drawings:

[0016] Figure 1 This is a schematic diagram of the power supply circuit of the main transformer integrated board of the utility model. Specific implementation method:

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] The utility model discloses a main transformer integrated board power supply circuit, comprising a varistor Z1, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a reactance LL1, a common mode inductor LL3, a fourth resistor R4, a second capacitor C2, a rectifier DB1, a first filter capacitor E1, a third filter capacitor E3, a switch relay RY1, an anti-backflow diode D3, a fifth resistor R5, a second filter capacitor E2 and a switch power supply.

[0019] The first resistor R1, the second resistor R2 and the third resistor R3 are connected in series, and then connected in parallel with the varistor Z1 and the first capacitor C1 between the live wire L and the neutral wire N of the mains voltage of 110VAC.

[0020] The live wire L2 of the mains 110VAC voltage is connected in series with the reactor LL1 and then connected in series with the common mode inductor LL3.

[0021] A fourth resistor R4 is connected in series between the neutral line N of the 110VAC mains voltage and the neutral line N2, and the switch relay RY1 is connected in parallel to the fourth resistor R4.

[0022] A second capacitor C2 is connected in parallel between the common mode inductor LL3 and the rectifier DB1. The common mode inductor LL3 is connected to the two input terminals of the rectifier DB1 through wires, and the two output terminals of the rectifier DB1 are connected to the VBus terminal and the ground terminal respectively through wires. A first filter capacitor E1 and a third filter capacitor E3 are connected in series between the VBus terminal and the ground terminal. A wire connected to one of the output terminals of the common mode inductor LL3 is connected between the first filter capacitor E1 and the third filter capacitor E3.

[0023] A first diode D1, a second diode D2 and a fifth resistor R5 are connected in series between the live wire L of the mains voltage of 110VAC and the switching power supply.

[0024] The VBus terminal is connected in series with an anti-backflow diode D3, and the anti-backflow diode D3 is connected in series to a wire between the second diode D2 and the fourth resistor R4 through a wire.

[0025] One end of the second filter capacitor E2 is connected to the ground terminal through a wire, and the other end is connected to the fifth resistor R5 and the switch power supply through a wire.

[0026] The working principle of the main transformer integrated board power supply circuit of the utility model is as follows:

[0027] After the door lock is closed, the live wire L of the 110VAC voltage of the mains is connected to the live wire L2 after the door lock is closed. The 110VAC voltage of the mains passes through the varistor Z1, the first capacitor C1, the reactor LL1, and the common mode inductor LL3, and then passes through the second capacitor C2 to the rectifier DB1 for full-bridge rectification. Then, the voltage is doubled through the first filter capacitor E1 and the third filter capacitor E3 connected in series and reaches the VBus end. The VBus end is then transmitted to the second filter capacitor E2 through the anti-backflow diode D3 to supply the switching power supply and realize the power supply of the computer board. The circuit in the closed state of the door lock can be regarded as the first part of the entire power supply circuit. The first part of the circuit can only be connected to the mains after the door lock is closed to generate the voltage required for the variable frequency drive.

[0028] When the door lock is open, the 110VAC mains voltage directly passes through the first diode D1 and the second diode D2 for half-bridge rectification, and is supplied to the switching power supply by the second filter capacitor E2 to power the computer board. The circuit when the door lock is open can be regarded as the second part of the entire power supply circuit. When the door lock is open, the voltage after half-bridge rectification is output to the switching power supply, and the switching power supply generates 15V or 12V voltage for the main transformer integrated board and the display board.

[0029] When the washing machine is in standby mode, the computer board is half-bridge rectifier to supply DC power, and the washing machine can operate normally. After starting to run, the door lock switch of the washing machine is closed, and the computer board becomes full-bridge rectifier, and then supplies DC power with 2 times the voltage. Since the switching power supply can adapt to wide voltage power supply, the whole system can work normally. The two circuit parts of the utility model complement each other, thereby ensuring that the circuit board works stably.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A main transformer integrated board power supply circuit, characterized in that: It includes a reactance LL1, a common mode inductor LL3, a fourth resistor R4, a rectifier DB1, a first filter capacitor E1, a third filter capacitor E3, a switch relay RY1, an anti-backflow diode D3, a fifth resistor R5, a second filter capacitor E2 and a switching power supply; The live wire L2 of the mains voltage of 110VAC is connected in series with the inductor LL1 and then connected in series with the common-mode inductor LL3. A fourth resistor R4 is connected in series between the neutral wire N of the mains voltage of 110VAC and the neutral wire N2. The switch relay RY1 is connected in parallel to the fourth resistor R4. The common-mode inductor LL3 is connected to the two input terminals of the rectifier DB1 through wires. The two output terminals of the rectifier DB1 are respectively connected to the VBus terminal and the ground terminal through wires. The first filter capacitor E1 and the third filter capacitor E3 are connected in series between the VBus terminal and the ground terminal. The wire connected to one of the output terminals of the common-mode inductor LL3 is connected between the first filter capacitor E1 and the third filter capacitor E3. A first diode D1, a second diode D2 and a fifth resistor R5 are connected in series between the live wire L of the mains 110VAC voltage and the switching power supply, a third diode D3 is connected in series at the VBus end, and the third diode D3 is connected in series to a wire between the second diode D2 and the fourth resistor R4 through a wire, one end of the second filter capacitor E2 is connected to the ground terminal through a wire, and the other end is connected to the fifth resistor R5 and the switching power supply through a wire.

2. The main transformer integrated board power supply circuit according to claim 1, characterized in that: It also includes a varistor Z1, a first capacitor C1, a first resistor R1, a second resistor R2 and a third resistor R3. The first resistor R1, the second resistor R2 and the third resistor R3 are connected in series with the varistor Z1 and the first capacitor C1 and connected in parallel between the live wire L and the neutral wire N of the mains voltage of 110VAC.

3. The main transformer integrated board power supply circuit according to claim 2, characterized in that: A second capacitor C2 is connected in parallel between the common mode inductor LL3 and the rectifier DB1.

4. The main transformer integrated board power supply circuit according to claim 3, characterized in that: The third diode D3 is an anti-backflow diode D3.

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