KR930013920A - Phase control circuit for power control - Google Patents

Abstract

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Description

Phase control circuit for power control

As this is a public information case, the full text was not included.

1 is a three-phase power control circuit.

2 is a block of a phase control circuit for controlling the phase angle of FIG.

3 is a detailed circuit diagram of FIG.

4A to 4F are waveform diagrams for explaining the operation of FIG.

* Explanation of symbols for main parts of the drawings

1: Phase Detection Units 2, 6, and 12: First to Third Clamping Units

3, 7 and 13: first to third phase control unit

4, 8, and 14: first to third sawtooth wave generator

5, 9 and 15: first to third phase comparison unit

10, 11, and 16: first to third SCR driver

17: sensing voltage amplifier 18: reference voltage setting unit

19: fourth comparison unit 20: soft start unit

21: current limiting part

Claims (8)

A power control phase control circuit comprising: phase detection means for detecting a phase of an input three-phase power frequency, clamping means for clamping a signal other than a set value among the phase signals from the phase detection means, and a signal output from the clamping means. Means for shifting the signal to the left or right, sawtooth wave generating means for generating a sawtooth wave in accordance with a signal output from the phase control means, and amplifying means for amplifying a voltage in a resistor R connected in series with the load resistance of the power control circuit. Reference voltage setting means arbitrarily set by a computer or user, voltage comparing means for comparing signals output from the amplifying means and reference voltage setting means, soft start means for controlling an output signal of the reference voltage setting means, and When the output signal from the voltage comparing means is outside the upper and lower limits An SCR of the power control circuit according to the current limiting means for limiting the output of the voltage comparing means, a phase comparing means for comparing the output signals from the sawtooth wave generating means and the current limiting means, and an output signal from the phase comparing means. A phase control circuit for power control, comprising: an SCR driving means for generating a trigger pulse for controlling the conduction angle of the circuit. 2. The clamping device according to claim 1, wherein the clamping means comprises: a resistor element connected from the phase detection means, a diode D2 and a capacitor C1 connected between the resistor element and ground, and a diode D1 connected between the resistor element and a direct current supply voltage V. Phase control circuit for power control, characterized in that consisting of. 2. The phase control means according to claim 1, wherein the phase control means comprises: an operational amplifier U1 to which a resistance element is connected between its output and an inverting terminal, a variable resistor VR3 connected from an inverting terminal of the operational amplifier U1, and an inverting terminal of the operational amplifier U1. And a capacitor C14 connected between the grounds and the power control phase control circuit. 2. The sawtooth wave generating means according to claim 1, wherein the sawtooth wave generating means is connected from a resistor element connected from the output terminal of the operational amplifier U1, a capacitor element connected in series connected from the resistor element, and the capacitor element, And a collector terminal comprising a transistor Q1 connected to a DC supply voltage V through a resistor, a diode and a resistor connected between the base terminal and the ground of the transistor Q1. The power control phase control circuit according to claim 1, wherein said phase comparing means comprises an operational amplifier. 2. The transistor according to claim 1, wherein the SCR driving means includes a capacitor C8 connected from the phase control means, a transistor Q4 connected from the capacitor C8, and an emitter terminal is grounded, a collector terminal of the transistor Q4, and a DC supply voltage V. A diode D13 connected between the diode D13, a transformer T1 having a primary side connected between both ends of the diode D13, a diode D16 connected from one terminal of the secondary side of the transformer T1, a resistor R50 connected in series from the diode D16, And a capacitor C11 connected between the resistor R50 and the remaining terminals of the transformer T1, a resistor R33 and a diode D10 connected between the base terminal of the transistor Q4 and the ground. 2. The phase control circuit for power control according to claim 1, wherein the amplifying means comprises cascaded operational amplifiers U7 and U8. 2. The resistor start method according to claim 1, wherein the soft start means comprises a transistor Q8 having an emitter terminal connected to a -V terminal, a capacitor C23 connected to the resistor R67, a diode D69 and a resistor R68 connected between the resistors R67 and -V terminals. Phase control circuit for power control, characterized in that consisting of. ※ Note: The disclosure is based on the initial application.