Dual power supply automatic switching control circuit for mute oil-free air compressor

Abstract

The present application is directed to the user mute oil-free air compressor using 220V power supply, the line is often long, the pressure drop is serious, causing single-phase motor starting difficulty, and easy to burn motor, and the user will power to 380V power supply, causing damage to the equipment accident, our technical personnel for this invention a mute oil-free air compressor dual power automatic switching control circuit, using air compressor single-phase motor main winding original two coils in parallel operation for 220V power supply, series operation can withstand 380V voltage, through the circuit control air compressor single-phase motor main winding two coils in parallel and series connection, realized the automatic switching of AC power voltage 220V / 380V, solved the safe and normal use of equipment, and facilitated the user.

Description

Technical Field

[0001] This invention relates to the field of air compressor control, and in particular to a dual-power automatic switching control circuit for a silent oil-free air compressor. Background Technology

[0002] A serious problem exists with the intelligent silent oil-free air compressor controller: when users use 220V power, the long lines often result in significant voltage drops, making it difficult to start single-phase motors and easily burning them out. Customers have repeatedly suggested improvements. In addition, there have been multiple incidents where users have mistakenly connected the power supply to 380V, causing damage to the equipment. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned deficiencies and technical problems. Our company's technicians have invented a dual-power automatic switching control circuit for a silent oil-free air compressor. This circuit utilizes the two coils of the main winding of the single-phase motor of the air compressor, which operate in parallel to provide 220V power and can withstand 380V when operating in series. Automatic switching is achieved through circuit control.

[0004] The technical solution of this invention is a dual-power automatic switching control circuit for a silent oil-free air compressor. Its characteristic is that it utilizes the two coils of the main winding of the single-phase motor of the air compressor, which operate in parallel to provide 220V power, and can withstand 380V when operating in series. The working principle is that AC power enters the circuit controller KZQ through controller terminals XDZ1 and XDZ2. The circuit controller KZQ samples and identifies whether the AC power voltage is 220V or 380V. When the AC power voltage is 220V, relay J1 is activated, and the normally open contact J1-1 of relay J1 closes, while relay J2 remains closed. At this time, the main windings L1-1 and L1-2 of the single-phase motor are connected in parallel. The starting winding L1-3 of the single-phase motor is the starting winding. When the single-phase motor of the air compressor is running normally, and the AC power supply voltage is 380V, both control relays J1 and J2 are energized. The normally open contact of relay J1-1 closes, and the normally open contacts of relays J2-1 and J2-2 close. At this time, the first main winding L1-1 and the second main winding L1-2 of the single-phase motor are connected in series. The starting winding L1-3 of the single-phase motor is still the starting winding, and the single-phase motor of the air compressor continues to run normally, achieving automatic switching between 220V and 380V AC power supply voltages. The pressure switch KY activates when the air compressor reaches the set pressure, temporarily stopping the machine. When the air pressure is low, the pressure switch KY automatically activates. The solenoid valve DF releases the stored air pressure after the air compressor stops. The circuit structure is as follows: one end of the 220V / 380V AC power supply is connected to terminal XDZ1 and the normally open contact of relay J1-1; the other end is connected to terminal XDZ2, the normally closed contact of relay J2-2, and one end of the first main winding L1-1 of the single-phase motor. The moving contact of relay J1-1 is connected to one end of pressure switch KY. The other end of pressure switch KY is connected to one end of the starting winding L1-3 of the single-phase motor, one end of solenoid valve DF, one end of the second main winding L1-2 of the single-phase motor, and the normally closed contact of relay J2-1. The other end of L1-1 is connected to the moving contact of relay J2-1. The other end of the single-phase motor starting winding L1-3 is connected to the starting capacitor C1. The other end of the starting capacitor C1 is connected to the other end of the solenoid valve DF, the other end of the motor main winding L1-2, and the moving contact of relay J2-2. The normally open contact of relay J2-1 is connected to the normally open contact of relay J2-2. The output control of circuit controller KZQ is connected to one end of resistor R1. The other end of resistor R1 is connected to the base of transistor BG1. The collector of transistor BG1 is connected to one end of the coil of relay J1 and the anode of diode D1. One end of the coil of relay J1 and the cathode of diode D1 are connected to the positive power supply VDD.The output control of the circuit controller KZQ is connected to one end of resistor R2. The other end of resistor R2 is connected to the base of transistor BG2. The collector of transistor BG2 is connected to one end of the coil of relay J2 and the anode of diode D2. One end of the coil of relay J2 and the cathode of diode D2 are connected to the positive power supply VDD.

[0005] This invention addresses the common problem of long power lines causing significant voltage drop when using 220V power to silent oil-free air compressors. This leads to starting difficulties for single-phase motors and increases the risk of motor burnout. Furthermore, there have been instances of users mistakenly connecting the power supply to 380V, resulting in equipment damage. Our company's technicians have developed a dual-power supply automatic switching control circuit for silent oil-free air compressors. This circuit utilizes the two coils of the main winding of the single-phase motor, which operate in parallel for 220V and in series to withstand 380V. By controlling the parallel and series connection of the two coils of the single-phase motor's main winding, the circuit achieves automatic switching, solving the problem of safe and normal equipment operation and providing convenience for users. Attached Figure Description

[0006] Figure 1 Dual power supply automatic switching control circuit diagram for silent oil-free air compressor

[0007] Figure 1 The components include: L1-1 single-phase motor main winding 1, L1-2 single-phase motor main winding 2, L1-3 single-phase motor starting winding, DF solenoid valve, KY pressure switch, KZQ circuit controller, XDZ1 controller terminal block 1, XDZ2 controller terminal block 2, J1 relay, J2 relay, J1-1 relay J1 contact, J2-1 relay J2 contact, J2-2 relay J2 contact, R1-R2 resistors, starting capacitor C1, D1-2 diodes, BG1-BG2 transistors, VDD positive power supply, and V0 common terminal.

[0008] Figure 1 This is a circuit diagram for an automatic switching control of dual power supply for a silent oil-free air compressor. The working principle is that the AC power supply is sampled and identified by the circuit controller KZQ to determine whether it is 220V or 380V. When the AC power supply voltage is 220V, relay J1 is activated, and the single-phase motor main winding 1 L1-1 and single-phase motor main winding 2 L1-2 are connected in parallel. When the AC power supply voltage is 380V, relay J1 and relay J2 are activated, and the normally open contacts of relay J2-1 and relay J2-2 are closed, connecting the single-phase motor main winding 1 L1-1 and single-phase motor main winding 2 L1-2 in series, thus achieving automatic switching to adapt to AC power supply voltages of 220V / 380V. Detailed Implementation

[0009] The circuit structure is as follows: one end of the 220V / 380V AC power supply is connected to the controller terminal block XDZ1 and the normally open contact of relay J1-1; the other end of the 220V / 380V AC power supply is connected to the controller terminal block XDZ2, the normally closed contact of relay J2-2, and one end of the single-phase motor main winding L1-1; the moving contact of relay J1-1 is connected to one end of pressure switch KY; the other end of pressure switch KY is connected to one end of the single-phase motor starting winding L1-3, one end of solenoid valve DF, one end of the single-phase motor main winding L1-2, and the normally closed contact of relay J2-1; the other end of the single-phase motor main winding L1-1 is connected to the moving contact of relay J2-1; and the other end of the single-phase motor starting winding L1-3 is connected to starting capacitor C1. The other end connects to the other end of the solenoid valve DF, the other end of the motor main winding L1-2, and the moving contact of relay J2-2. The normally open contact of relay J2-1 is connected to the normally open contact of relay J2-2. The output control of circuit controller KZQ is connected to one end of resistor R1. The other end of resistor R1 is connected to the base of transistor BG1. The collector of transistor BG1 is connected to one end of the coil of relay J1 and the anode of diode D1. One end of the coil of relay J1 and the cathode of diode D1 are connected to the positive power supply VDD. The output control of circuit controller KZQ is connected to one end of resistor R2. The other end of resistor R2 is connected to the base of transistor BG2. The collector of transistor BG2 is connected to one end of the coil of relay J2 and the anode of diode D2. One end of the coil of relay J2 and the cathode of diode D2 are connected to the positive power supply VDD. A circuit board is fabricated according to the circuit structure, or it can be integrated with the original silent oil-free air compressor control circuit onto a single circuit board.

Claims

1. A dual-power automatic switching control circuit for a silent oil-free air compressor, characterized in that: The air compressor's single-phase motor utilizes two coils of its main winding connected in parallel to provide 220V power, and can withstand 380V when connected in series. The working principle is as follows: AC power enters the circuit controller KZQ through controller terminals XDZ1 and XDZ2. The circuit controller KZQ samples and identifies whether the AC power is 220V or 380V. When the AC power is 220V, relay J1 is activated, closing its normally open contact J1-1, while relay J2 remains closed. At this time, the single-phase motor's main windings L1-1 and L1-2 are connected in parallel, and the starting winding L1-3 is the starting winding. The air compressor's single-phase motor operates normally. When the AC power is 380V... When the power supply voltage is 380V, both control relays J1 and J2 are energized. The normally open contact of relay J1-1 closes, and the normally open contacts of relays J2-1 and J2-2 close. At this time, the main windings L1-1 and L1-2 of the single-phase motor are connected in series, and the starting winding L1-3 of the single-phase motor is the starting winding. The single-phase motor of the air compressor also operates normally, realizing automatic switching between AC power supply voltages of 220V and 380V. The circuit structure is as follows: one end of the AC power supply voltage 220V / 380V is connected to terminal XDZ1 and the normally open contact of relay J1-1, and the other end of the AC power supply voltage 220V / 380V is connected to terminal XDZ1.

2. The normally closed contact of relay J2-2 is connected to one end of the main winding L1-1 of the single-phase motor. The moving contact of relay J1-1 is connected to one end of pressure switch KY. The other end of pressure switch KY is connected to one end of the starting winding L1-3 of the single-phase motor, one end of solenoid valve DF, one end of the main winding L1-2 of the single-phase motor, and the normally closed contact of relay J2-1. The other end of the main winding L1-1 of the single-phase motor is connected to the moving contact of relay J2-1. The other end of the starting winding L1-3 of the single-phase motor is connected to starting capacitor C1. The other end of starting capacitor C1 is connected to the other end of solenoid valve DF, the other end of the main winding L1-2 of the motor, and relay J2-2. The normally open contact of relay J2-1 is connected to the normally open contact of relay J2-2. The output control of circuit controller KZQ is connected to one end of resistor R1. The other end of resistor R1 is connected to the base of transistor BG1. The collector of transistor BG1 is connected to one end of the coil of relay J1 and the positive terminal of diode D1. One end of the coil of relay J1 and the negative terminal of diode D1 are connected to the positive power supply VDD. The output control of circuit controller KZQ is connected to one end of resistor R2. The other end of resistor R2 is connected to the base of transistor BG2. The collector of transistor BG2 is connected to one end of the coil of relay J2 and the positive terminal of diode D2. One end of the coil of relay J2 and the negative terminal of diode D2 are connected to the positive power supply VDD.

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