Tracking Regulated Power Supply Circuit and Its Influencing Factors
Because the loop gain is very high, the drift due to voltage changes and load current changes is very small. The way to reduce the temperature drift is to choose an operational amplifier that is less affected by temperature, choose a resistor with a metal film or wire winding and a small temperature coefficient, and use a temperature-compensated regulator for the reference power supply.
Circuit diagram of tracking regulated power supply composed of op amp. If the op amp gain is large enough, the bias voltage Vos will be much smaller than Vs, Vo=Vs(R1+R2)/R2, so the output voltage is determined by the reference voltage Vs and the ratio of R1 and R2. Therefore, the drift of the power supply is determined by the reference voltage, the change of the voltage divider resistance, and so on.
1000W automatic voltage regulation AC regulated power supply circuit
The circuit of 1000W automatic voltage-regulating AC regulated power supply is shown in the figure below, and its working principle: T is a self-coupling voltage regulator. Its output end is fixed, and the input end is automatically adjusted by a servo motor to keep the output constant.
Transistor VTl, VT2: 3DK9C, β=65~85; VT3: 3AX818, β=60~80; Diode VD2, VD3, VD6~VD9: 1N4002; VD4, VD5, VD10: 1N4148; VD11: IN4001; LED VD1: BT304; Zener diode VD12: 2CW119; Capacitor C1: lμF400V; C2, C3: 0.1μF250V; C4, C5: 220μF25V; C6: 470μF50V; C7, C8: 47μF50V; R6: 2.7kΩ; R4: 470Ω; R5: 51Ω; the nominal power of the resistor is 1/2~1/4W metal film resistor except that the resistor Rl is selected to be greater than 3W; the potentiometer RPl, RP2: 1kΩ; the relay Kl ～K3: JRK-13F; AC contactor KA: 522; Servo motor M: ND-D; Voltmeter PV: 85L1-0～250V; Switch S1KN3?3; S2: KN-2W1D; .
