CN2154424Y - Electronic time plug for electric heater - Google Patents

Abstract

The utility model relates to an electronic timing plug, which is especially suitable for the ohmic heating of an electric heating warmer. When a power supply is switched on, the indicating lamp of the utility model is turned on; when the set time is up, the power supply is automatically switched off, and the indicating lamp of the utility model is extinguished; the set time can be changed according to requirements. The utility model takes a capacitor, the voltage reduction of a resistor, and the voltage stabilization of a voltage multiplying rectifier as the direct current power supply of a control element, taking a bidirectional thyristor as a switching element, and thus the utility model has small size with the length of 56 mm, the width of 36 mm and the height of 26 mm, and can be plugged into a flat triple-pin socket.

Description

Electronic time plug for electric heater

The utility model is a kind of electronic timing plug, the electronic timing plug that particularly a kind of hot warmer of powering uses.

Electric heating device on the domestic market is to utilize the bimetal leaf control that is installed in electric heating device inside to cut off the power supply when switching on heating, and bi-metal plate deformed when instant heating arrives uniform temperature makes contact separate deenergization.But its internal temperature up to 500 ℃～600 ℃, use will to lose its function soon, disconnected not switch power supply, heat time heating time is long, burns out electric heating device, even causes fire.Bimetal leaf is installed in electric heating device inside, is to repair in case lost efficacy.This problem becomes the key that influences this product quality.

The purpose of this utility model is that a kind of electronic timing plug will be provided, and it can prevent the electric heating device problem out of control of cutting off the power supply effectively.

The purpose of this utility model is achieved in that and changes be contained in electric heating device temperature inside controller bimetal leaf as outside time controller---electronic timing plug into.

The former control mode of electric heating device---temperature control was the most direct control originally, but its interior environment temperature up to 500 ℃～600 ℃.Bimetal leaf was lost efficacy.If heat is passed to the lower position of temperature pacifies bimetal leaf again, heat transfer process can be subjected to externally temperature influence.But for the electric heating device of certain model each conduction time be certain, so just can take indirect control mode---time control.Its cost and bimetal leaf control mode are very nearly the same, and volume is little, and can do becomes the electronic timing plug in than the slightly bigger plug of common three-pin plug, and former plug is the same convenient with using.Just in case lost efficacy; Only need maintenance electronic timing plug, do not influence electric heating device, and in a single day bimetal leaf lost efficacy, whole electric heater is scrapped, and can not repair.

The utility model is with the break-make of bidirectional triode thyristor control power supply, than common timer is low with the break-make cost of power source for relay control, volume is little.

Required low-voltage dc power supply itself adopts the capacitance resistance step-down to obtain the same bridge rectifier of rectification effect with two commutation diode voltage multiplying rectifiers in the utility model.The required low-voltage dc power supply of common timer itself is that the capacitance resistance step-down obtains with four commutation diode bridge rectifiers, these are not only many with two commutation diodes, and from electric principle it can not trigger bidirectional triode thyristor and makes it in all conductings of electric network positive and negative half-wave, can only half-wave conducting or control relay.

Concrete structure of the present utility model such as Fig. 1, electrical schematic diagram such as Fig. 2.

At a long 56mm, an indicator lamp (2) and a button (3) are arranged above the rectangle bakelite box (1) of the high 26mm of wide 36mm, flat three-pin plug (4) is arranged below the bakelite box.Can insert in common flat three sockets.

(5) be output cable, the other end connect with electric heating device on the supporting plug of socket.Electronic timer is inserted power supply, click button (2), red led (2) is bright, begins energising, cuts off the power supply automatically to setting-up time, and redness refers to that lamp extinguishes.Model according to electric heating device can have different setting-up times.

C among Fig. 2 ₁, R ₁, form electric capacity, resistance drop volt circuit, VD ₁, VD ₂, C ₂, VD ₃Form the voltage multiplying rectifier constant voltage dc source.Time-base integrated circuit NEZ555 and peripheral cell are formed timing circuit, pass through R ₄With light emitting diode VD ₄Trigger bidirectional triode thyristor VS, connect load RL.Select bidirectional triode thyristor VS for use according to the needs of load RL.Parameter conduction time is 5 minutes among Fig. 2, changes R ₃Or C ₃Can change conduction time.

Claims (3)

1, electronic timing plug, the electronic timing plug that particularly a kind of hot warmer of powering uses, this plug timing circuit is contained in the bakelite box (1), one indicator lamp (2) and a button (3) are arranged above it, flat three-pin plug (4) is arranged below, it is characterized in that adopting electric capacity, resistance step-down, voltage multiplying rectifier, bidirectional triode thyristor STS makes switch element, volume is little, long 56mm, wide 36mm, high 26mm.

2,, it is characterized in that adopting electric capacity, resistance step-down, voltage multiplying rectifier according to the described plug of claim 1.

3, according to claim 1,2, described plug, it is characterized in that making switch element with bidirectional triode thyristor.

Images