JP2005174746A - Control circuit of domestic electric heating equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control circuit of domestic electric heating equipment capable of saving electric power, and applicable to various different loads even if the specifications of components are changed. <P>SOLUTION: The control circuit of the domestic electric heating equipment reduces the power consumption of the domestic electric heating equipment in such a way that an AC power source filter circuit 1 is installed, a Darlington circuit is connected to the rear part of the filter circuit 1, and an SCR circuit 3 is installed in the rear of the Darlington circuit 2 to reduce electric power consumed in the load. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a control circuit for household electric appliances.

  Household heaters, heaters, etc. that are currently being used generally have a multi-stage switch and a voltage resistor with a relatively high resistance value, and control the consumed power by dividing the AC power supply. ing.

  Conventional home heaters and heaters use an electrical resistor to divide the input voltage, but in reality, the voltage resistor consumes input power. And no matter where the switch is adjusted, even if the power of the load is changed, the input AC power supply of the electric heater does not change, so the power consumption remains the same, which is considerably uneconomical.

  Accordingly, an object of the present invention is to provide a control circuit for a household electric appliance that can save power by improving the above-mentioned drawbacks, and can be applied to various different loads by changing the specifications of the components therein. .

  In the present invention, as means for reducing the electric power of the electric heating apparatus described above, an AC power supply filter circuit is provided, a Darlington circuit is connected behind the AC power supply filter circuit, and an SCR circuit is further provided behind the Darlington circuit so that the power consumed by the load. To reduce power consumption of household electric appliances.

  The principle is that the zero current at the exchange point of the positive and negative half waves of the AC power supply is used to turn on the Darlington circuit and turn on the SCR behind it to reduce the power by operating the load. It is what is done.

  The control circuit of the present invention does not turn on the Darlington circuit when the AC power supply is positive or negative half-wave, and does not pass current to the load, however, Darlington circuit when zero current is present when the positive and negative half-waves are exchanged. Is turned on, so that the SCR is also turned on and current flows to the load.

As shown in FIGS. 1 and 2, the control circuit of the household electric appliance according to one embodiment of the present invention includes two diodes D ₁ and D ₂ and four electric resistors R ₁ , R ₂ , R ₃ , A power filter circuit composed of R ₄ and a capacitor C ₁ , a Darlington circuit 2 composed of _two transistors Q ₁ and Q ₂ and an electric resistor R _5, and three electric resistors The SCR circuit includes R ₆ , R ₈ , R ₉ , a transistor Q ₃ , two diodes D ₄ and D ₅ , a capacitor C _2, and an SCR (Silicon controlled rectifier).

Power filter circuit 1 is an AC power source to be input is the exchange point D of the positive and negative half-wave shown in FIG. 3, and when the switch SW is in the position of S _1, namely input AC power is two diodes D ₁ , D ₂ , a positive potential (V +) at point A, and supplied to the Darlington circuit 2 located behind.
Next, the positive potential (V +) at the point A turns on the transistors Q ₂ and Q _1, and the location at the point B generates a positive potential (V +). The positive potential (V +) at point B is supplied to the SCR circuit 3 connected to the rear thereof.

The transistor Q ₃ of the SCR circuit 3 positive potential at point B (V +) will drive has been ON, and subsequently diode D ₄ becomes ON, the positive potential (V +) is generated at a point C point. In this way, the SCR is also driven ON, and the load LOAD is just at the exchange point of the positive / negative half-wave, so that the current is passed and the power consumption is saved, thereby saving power.
What if the switch SW is adjusted to the position of S _2, the load LOAD becomes best operation, this embodiment can be referred to practical design.

  In the control circuit of the present invention, when the input power source is a positive half wave or a negative half wave, the Darlington circuit is not turned on, so that no current is passed to the load, but only when the positive / negative half wave is exchanged, the current is passed to the load. So you can save power. Moreover, if the standard of the partial product in it is changed, it can be applied to various different loads.

It is a wiring diagram which shows the control circuit of the household electric appliance by one Example of this invention. It is a block diagram which shows the control circuit of the household electric appliance by one Example of this invention. It is a wave form diagram which shows the alternating current power supply of the control circuit of the household electric appliance by one Example of this invention.

Explanation of symbols

1 Power supply filter circuit, D ₁ diode, D ₂ diode, D ₄ diode, D ₅ diode, R ₁ resistor, R ₂ resistor, R ₃ resistor, R ₄ resistor, R ₅ resistor, R ₆ resistor , R ₈ resistor, R ₉ resistor, C ₁ capacitor, 2 Darlington circuit, 3 SCR (Silicon controlled rectifier) circuit, Q1 transistor, Q2 transistor, Q3 transistor

Claims (4)

An AC power filter circuit, a Darlington circuit connected to the rear of the AC power filter circuit, and an SCR (Silicon controlled rectifier) circuit connected to the rear of the Darlington circuit,
A positive potential (V +) is generated at the point A of the AC power supply filter circuit when the input AC power source is a positive / negative half-wave exchange zero point D, and the positive potential (V +) at the point A turns on the Darlington circuit. A positive potential (V +) is generated at the point B of the Darlington circuit, the positive potential (V +) at the point B turns on the SCR circuit, and a positive potential (V +) at the point C of the SCR circuit. ), And the positive potential (V +) at the point C is configured to operate the load LOAD. The AC power supply filter circuit includes two diodes D ₁ and D ₂ , four resistors R ₁ , R ₂ , R ₃ and R _4, and a capacitor C _1. Item 12. A control circuit for a household electric appliance according to Item 1. _2. The control circuit for a household electric appliance according to claim 1, wherein the Darlington circuit includes two transistors Q ₁ and Q ₂ and a resistor R ₅ . The SCR circuit is composed of three resistors R ₆ , R ₈ and R ₉ , one transistor Q ₃ , two diodes D ₄ and D ₅ , a capacitor C ₂ and an SCR. A control circuit for a household electric appliance according to claim 1.

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