KR20010001946A - Series Source AC Power ON/OFF Control. - Google Patents

Abstract

PURPOSE: A power on/off controlling method is provided to obtain a serial power in a serial AC power without using a power transformer and protect all circuits in respect to an impulsive overcurrent generated from the input AC power or a load. CONSTITUTION: When a switch is short-circuited, a triac 1 is closed and an AC power is inputted to A1 point of a triac 2, then a voltage is applied to the triac 2. If A point is positive and B point is negative, a zener diode(ZD1) is closed to form a uniform voltage to a zener diode(ZD2). The triac 2 is closed and a current corresponding to a breakover current of the triac 2 is flowed to a DC power rectifying circuit. When A point is negative and B point is positive, a voltage division to a parallel voltage is performed to protect a circuit from an overvoltage. When the switch is open, the current does not flow to a load with a sufficient amount to operate the load. DC power can be obtained even in this state according to operative principles of the triac 2, the zener diode(ZD1,ZD2) and capacitors(C2,C3).

Description

Power on / off control method of serial load using series AC power. {Series Source AC Power ON / OFF Control.}

The present invention securely obtains the DC power required for the controller to control the power of the series load from the AC power input in series and the DC power rectifier circuit and controller from the impulse overvoltage generated in the AC power itself or the impulse overvoltage generated in the load. It is designed to turn on / off load power while protecting.

The technical field of the present invention is a power control technology of a serial load, and in the case of the conventional method I as shown in FIG. 1, a power transformer is required to obtain a series power required by the power control device of the load. In this case, when the switch is turned on, a large current flows in the resistor R2. Therefore, a resistance of several watts is used, and a load in an inductive load and an impulsive overvoltage in the AC power supply itself may destroy the triac and the diode in the DC power rectifier circuit. There is a danger.

The present invention is to solve the technology to safely obtain the DC power from the series AC power without using the power transformer in the technical method and to protect all the circuits to operate safely against the impulse overvoltage generated from the input AC power or the load. .

Fig. 1 relates to the conventional method I. When the switch is turned off, it passes through the capacitor (C) and the resistor (R), and in the controller using the power induced in the coil L3 by the excitation of the coil L1 and L2 It controls the switch by acquiring the necessary DC power. When the switch is turned on, the controller acquires the required DC power by the induction power of L2 to L3 of the coil. It is a method of using the power transformer.

Fig. 2 relates to the conventional method II. When the switch is turned off, the microcurrent passes through the capacitor C1 and the resistor R1. Is applied to the point. The point is (+) If the point is negative, the voltage in parallel with Triac's A1, gate (G), and silicon symmetrical switch (SBS) versus resistor R2 Is applied to the point (-) Of the point passes through Zener diode ZD2 Applied to the point (-). Therefore, the voltage applied by the silicon symmetrical switch (SBS) in parallel with the resistor R2 and the zener diode ZD1 is specified as the breakover voltage (VBO) of the triac gate (G) and is represented by the voltage Vo and the triac is conducted. In terms of Current flows to the point.

Contrary The point is negative If the point is (+), as in the previous description The point is negative Since the point is (+), the breakover voltage (VBO) is formed by the voltage applied by the silicon symmetrical switch (SBS) voltage in parallel with the resistor R2 and the zener diode ZD2, and the voltage Vo is expressed and the triac is conducted in reverse direction. In terms of Current flows to the point. Silicon Symmetrical Switches G / There is a drawback of making discontinuous point of AC signal by using it as a property of conducting when voltage is applied at both ends.

In the circuit, the resistor R2 capacitor C2 acts to attenuate the overvoltage impulses of the zener diodes ZD1 and ZD2. In this case, when an impulsive signal is inputted at the A and B points, the resistor R2 and the capacitor are divided, and the impulsive signal shown between A and C flows as a distributed current between the resistors R2 and A ₁ -G-SBS.

In particular, in the case of the grizziness impulse property (a narrow high voltage), it can be applied as it is to malfunction the triac and destroy the junction insulation between A and G of the triac.

3 is a circuit according to the present invention, in order to safely obtain a DC power required for a controller that controls the power of the serial load from the AC power input in series, and protect the circuit from the impulse overvoltage generated from the AC power itself or the load. It is a circuit configuration method to control the power of the load.

(1) The process of obtaining DC power from series AC power is as follows.

-When the switch that can be controlled magnetically is connected (Short), when Triac 1 is turned on and AC power is input to A1 of Triac 2, the gate (G) of Triac 2 is input to A1 of Triac 2 Voltage is applied as a resistance characteristic of the liver. At this time The point is (+) If the point is (-), zener diode ZD1 is conducting and a constant voltage is formed at zener diode ZD2, which acts as the breakover voltage (VBO) of Triac 2 and conducts Triac 2, which is the AC input of the DC power rectifier circuit. The current Ig, represented by the voltage Vo and corresponding to the breakover voltage VBO of the triac 2, flows to the DC power rectifier circuit. Also, the AC characteristics change The point is negative If the point is (+), zener diode ZD2 is conducted and a constant voltage is formed at zener diode ZD1, and this voltage acts as breakover voltage (VBO) of Triac 2 and appears as AC input voltage Vo of DC rectifier circuit. Current Ig flows to the DC power rectifier circuit. At this time, the capacitors C2 and C3 are connected in series, and the voltage is divided into parallel voltages of C1 and Zener diode ZD1 in parallel voltage band C3 and Zener diode ZD2 in A1 and gate G2 of C2 and Triac 2, and circuit protection from overvoltage is also provided.

-When the electronically controllable switch is open, Triac 1 is not conducting and AC power is supplied through capacitor C1. It is applied to the point, but the load does not operate because a sufficient voltage does not flow to the load due to the voltage current falling when the capacitor C1 passes. The method of acquiring a DC power supply in a state where the load is not operated can be obtained by the operation principle of the triac 2, zener diodes ZD1, ZD2, and capacitors C2, C3.

(2) The circuit protection method from impulse overvoltage generated in AC power and load is as follows.

Since the impulse generated from AC power and load has a narrow pulse width, it rapidly passes through capacitors C1, C2, and C3 to protect the triac 1, 2 zener diodes ZD1, ZD2, and the DC power rectifier circuit. For example, impulse Point and When input to the point, the capacitor C1 acts as the load impedance (Z) and passes through the capacitor C1 before the response time of the triac 1 The impulse that passes through the point passes through the capacitors C2 and C3 connected in parallel with the triac 2, zener diodes ZD1, ZD2, and the DC power rectifier circuit to protect the circuit.

Fig. 4 relates to the waveform of the voltage Vo applied to the DC power rectifying circuit of the present invention circuit. The waveform of the voltage Vo when (1) the switch is open and (2) when the switch is connected is shown.

According to the present invention, a voltage is applied to a gate G of capacitors C1, C2, C3 and Triac 2 for protecting a circuit from a triac 1 controlling a main power supply and an impulsive overvoltage generated from an input AC power or a load. It consists of Zener diodes ZD1 and ZD2 for applying voltage to the DC power rectifier circuit.

According to the present invention, the DC power of the controller required to electronically control the power of the load connected to the series AC power is obtained from the series AC power supply without using the power transformer, and is applied to the impulsive overvoltage generated from the AC power or the load. All circuits can be safely protected.

Claims (2)

Method of configuring a power supply control circuit for a load connected to a series AC power supply as shown in FIG. A method of constructing a circuit of a DC power rectifying circuit as shown in FIG. 3 to protect a circuit from an overvoltage, an impulse overvoltage generated in an AC power supply or a load, and to safely obtain a DC power supply.