How to understand the circuit diagram - rectifier circuit
How to understand the circuit diagram - rectifier circuit
The rectifier circuit is a circuit that converts alternating current into unidirectional pulsating direct current by utilizing the unidirectional conduction performance of the semiconductor diode.
(1) Half-wave rectification
The half-wave rectifier circuit requires only one diode, see Figure 2 (a). VD is turned on during the positive half cycle of the alternating current, VD is cut off in the negative half cycle, and the pulsating direct current is obtained on the load R.
(2) full wave rectification
Two-diode is used for full-wave rectification, and the transformer is required to have two secondary coils with the same number of turns with a center tap, see Figure 2 (b). What is obtained on the load RL is a pulsating full-wave rectified current, and the output voltage is higher than that of the half-wave rectifying circuit.
(3) full wave bridge rectifier
A bridge rectifier circuit consisting of 4 diodes can use a transformer with only a single secondary coil, see Figure 2 (c). The current waveform and output voltage value on the load are the same as the full-wave rectifier circuit.
(4) voltage doubler rectification
Higher DC voltages can be obtained with multiple diodes and capacitors. Figure 2 (d) is a double voltage rectifier circuit. When U2 is negative half cycle, VD1 is turned on, C1 is charged, and the highest voltage on C1 can be close to 1.4U2. When U2 is halfway, VD2 is turned on, and the voltage on C1 and U2 are superimposed to charge C2, so that the voltage on C2 is close. 2.8U2 is twice the voltage on C1, so it is called double voltage rectifier circuit.
Industry Control Circuit Board
Industry control printed circuit boards (PCB)
1. For industrial control, special or general-purpose circuit board, the bottom circuit is completed, and IO is reserved. After buying the industrial control circuit board, the input and output ports reserved on the circuit board are connected to the user's own device, such as motor, solenoid valves, sensors, thus completing the function want to accomplish.
2. The special circuit board is a board specially designed for a certain function, such as the temperature control circuit board. After buying it, the input port is connected to the thermocouple, and the output port is connected with a heating contactor or a solid state relay to control the heating device to complete the temperature control. There are flow control boards, motion control boards, etc.
3. The universal control board, most of which can be programmed, after the user's own secondary development, completes a specific function, and has a wide range of uses. For example, plc is a general industrial control board. After the user writes the program and compiles the input, various functions can be completed. Digital input, analog input port, high-speed counter port, digital output port, analog output port, and some also have communication function.
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