KR950000763Y1 - Electric machine controller for electro-magnetic wave shielding - Google Patents

Abstract

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Description

Appliance control device for electromagnetic noise prevention

1 is a conventional home control circuit block for preventing electromagnetic noise.

2 is a block diagram of a home appliance control circuit for preventing electromagnetic noise of the present invention.

3 is a control timing diagram for the AC input of FIG.

* Explanation of symbols for main parts of the drawings

11: Hexa D Phillip flop 12: Relay driver

15: signal compensator 16: zero crossing unit

The present invention relates to a home appliance control device for preventing electromagnetic noise by minimizing electromagnetic noise by controlling the home appliance when the energy is the least AC by using a zero crossing circuit.

The conventional noise control device for home appliances has a hexa D flip-flop 11 for decoding a data bus input signal and a resistor R1 for reinforcing the decoded signal from the hex D Philip flop 1, as shown in FIG. A relay drive 2 and a manual adjustment switch SW1 to SW2 for controlling the corresponding home appliance relays 3 and 4 through ˜R7, and a relay contact 7 connected to the relays 3 and 4; (8) and home appliances (5) (6) connected in series with the relay contacts (7) (8).

In the conventional electronic appliance control device for preventing electromagnetic noise, the microprocessor (not shown) receives the control signal from the station and sends the signal on the data bus, and the hexa-D flip-flop 11 decodes the signal and pulls the signal up. Reinforce with (R1 ~ R7) and input to relay driver 2. The relay driver 2 then controls the corresponding relay (3) (4).

At this time, since the home appliances 5 and 6 are connected in series with the checks 7 and 8 of the relay, an AC voltage is applied, and thus the home appliances 5 and 6 can be controlled according to the on / off of the relay 3 and 4. . Here, insert the manual adjustment switch (S / W1 to S / W9) between the control terminal and ground to use in case of failure of the main unit.

However, such a conventional home appliance control device for preventing electromagnetic noise randomly turns on / off the control of home appliances irrespective of the magnitude of the alternating energy. There was a problem that could cause madness to malfunction.

The present invention is to control the home appliance when the energy is the least alternatingly by using a zero crossing unit in order to improve such a conventional problem, the present invention will be described in detail by the accompanying drawings.

A hexa D flip-flop 11 and a decoded signal from the hexa D flip-flop 11 for decoding control data carried on a data bus from a microprocessor are turned on and the corresponding relays 13 and 14 are turned on. Relay driver 12 with relay driver IC (not shown) for on / off and signal compensating resistors (R1 to R7) and manual switch (SW1 to SW7) and relay (13) for use in the event of failure of the main unit, A zero crossing portion 16 made of a resistor R3 and a photocoupler P · C for finding the minimum point of the alternating energy during the drive of the 14 and zero crossed from the top portion 16 of the zecro. The signal compensator 15 includes a transistor TR1, a resistor R1, a resistor R2, and a capacitor C2 that compensates for a signal.

When described in detail with reference to Figure 2 and Figure 3 the effect of the present invention configured as described above.

When control data is loaded on the data bus in the microprocessor, the hexa deflip-flop 11 outputs "high" to the control mode of the controller.

At this time, the nucleus deflecting flop 11 is outputted only when the CIE terminal rises (from "low" to "high"). At the same time as the output, only the signal coming in is output to the control port. Here, the zero crossing unit 16 and its signal compensation circuit are first connected to the AC power supply via the resistor R3 to the light emitting side of the photo coupler RC, where the resistor R3 is used to limit the current of the light emitting diode. It is a resistance for.

Then, as shown in the timing diagram of FIG. 3, the transistor on the output side of the line is turned on only when the light-emitting diode becomes more than 0.7 volts. ) And a resistor (R2) and a capacitor (C2) compensate for the signal at the time of rising and supply it to the chip enable (CE) terminal.

Then, the signal is supplied to the chip enable terminal CE once every about 15 [mg], so that the nucleus deflecting flop 1 outputs to the control output port only by the incoming data.

Then, the output of the control circuit is compensated again with the resistors R1 to R7 and supplied to the relay driver 12 so that the corresponding electric appliance has the least electromagnetic wave energy.

As described in detail above, the present invention has the effect of minimizing the electromagnetic noise generated during the control of home appliances in accordance with the electromagnetic interference regulations to prevent the effects on other home appliances and industrial electronic products, such as .

Claims (1)

The hexa D deflip-flop 11 which decodes the databis signal and outputs the decoded signal only when the chip-enabled C-E terminal rises, and the relay 13 as a signal decoded by the hexa-dilip-flop 11. The hexa-de-flip with a zero crossing section 16 which operates only when a voltage above a predetermined level is applied to drive 14, and finds the minimum point of the alternating energy, and a signal zero-crossed by the zero crossing section 16. And a signal compensator (15) for compensating the rising signal of the flop (11).