CN201690430U

CN201690430U - Oven timer circuit with low power consumption

Info

Publication number: CN201690430U
Application number: CN2010201980292U
Authority: CN
Inventors: 钱晓明
Original assignee: WUXI HEJING INFORMATION TECHNOLOGY Co Ltd
Current assignee: WUXI HEJING INFORMATION TECHNOLOGY Co Ltd
Priority date: 2010-05-21
Filing date: 2010-05-21
Publication date: 2010-12-29
Anticipated expiration: 2020-05-21

Abstract

The utility model relates to an oven timer circuit with low power consumption, which comprises a chip load and a relay. A work circuit of the chip load is a switch circuit consisting of two triodes and a capacitance-resistance part. The oven timer circuit is characterized in that the relay without independent work circuit is in series connection between the chip load and the switch circuit. Due to the characteristic of constant power current in a capacitance-resistance mode, the relay is not required to be provided with a power supply circuit additionally. On the premise of not increasing current of the total circuit, the oven timer circuit guarantees normal operation of the relay, reduces power consumption of an oven timer, is energy-saving and high-efficient, is few in elements, reduces cost and increases stability and reliability.

Description

A kind of baking box timer circuit of low-power consumption

Technical field

The utility model belongs to a kind of application circuit, the circuit that the timer of particularly a kind of household electrical appliance that are used for---baking box is used.

Background technology

This household electrical appliance of roaster need be used timer, automatically shut down baking box.The circuit of existing timer is such, and power supply uses the capacitance-resistance mode power, and getting of this load of chip of switch controlled low-voltage is electric, arranges a route road to power to relay in addition, and relay is controlled the work of whole oven heat.The circuit of this pattern, low voltage operating circuit and relay operating circuit are the equal of parallel circuits, for the capacitance-resistance mode power, under certain voltage and electric capacity, it is constant that the electric current of generation can be considered, like this, under the paralleling model, the work of relay be guaranteed, capacitance will be increased, improve operating current, also just increased power consumption; And components and parts are also more, are unfavorable for system stability and save cost.

Summary of the invention

The purpose of this utility model is the shortcoming that overcomes the baking box timer circuit of the described existing capacitance-resistance mode power of background technology, designs a kind of power and energy saving, baking box timer circuit low in energy consumption.

The utility model contains chip load and relay, the operating circuit of described chip load is the switching circuit that is made of two triodes and resistor-capacitor unit, it is characterized in that described relay does not have independent working line, but be connected between chip load and the switching circuit.

Preferred switching circuit constitutes: the power supply that holds the resistance pattern is connected to the emitter of a NPN triode, the base stage of the collector electrode of a NPN triode and a PNP triode links together after through a resistance, be parallel with two diode in series on the emitter of two triodes, diode connects the emitter place of NPN pipe, ground connection; Also and electric capacity is arranged, this two-way of the emitter utmost point of the collector electrode of PNP pipe and NPN pipe is connected to the chip load between the emitter and collector of PNP triode, and the chip load has feedback line to be connected to the base stage of NPN pipe.

Relay is connected in parallel between the emitter and collector of PNP triode, forms series relationship with whole switching circuit.

The utility model circuit, the constant characteristics of source current of capacitance-resistance pattern have been utilized, need not additionally arrange supply line to relay, under the situation that does not increase the entire circuit electric current, the assurance relay is worked normally, has reduced the power consumption of baking box timer, efficient energy-saving, and components and parts are few, reduced cost, improved the stability and reliability of entire circuit.

Description of drawings

Fig. 1, enforcement illustration of the present utility model.

Embodiment

As Fig. 1, the base stage of the collector electrode of NPN triode and PNP triode is connected by a resistance R 2, and supply voltage VDD connects the emitter as the PNP triode, and the emitter of the collector electrode of PNP triode and NPN triode is connected to chip load 1; Between the emitter and collector electrode of PNP triode, be parallel with diode D1, capacitor C 1 and relay 2, relay 2 has operating current VCC with the collector electrode junction, between the base stage and emitter of PNP pipe, and resistance R 1 is arranged; Between the emitter of the collector electrode of PNP pipe and NPN pipe and diode D2 is arranged, and ground connection.Supply voltage VDD just is connected in the chip load 1 by the switching circuit that two triodes and appearance resistor constitute like this, gives the chip electric, and simultaneously, relay 2 is serially connected between switching circuit and the chip load 1.The chip load also is connected with the base stage of NPN triode.

The workflow of this circuit is such: when relay 2 is idle, and the conducting of NPN triode control PNP pipe, source current flows directly into the chip loaded work piece; In the time of relay 2 work, NPN triode control PNP triode by, source current by relay 1, makes relay work earlier, and then flows into the chip load, allows chip operation.So just made full use of the electric current of the power supply of capacitance-resistance pattern, and need not to rely on the capacitance that increases power supply to increase electric current, improved efficient, reduced power consumption.

Except that the composition form of the switching circuit described in the present embodiment, use other transistor switching circuit series relay commonly used, utilize the characteristics of holding resistance mode power current constant, also can realize the utility model, also belong to open protection range of the present utility model.

Claims

1. the baking box timer circuit of a low-power consumption, contain chip load (1) and relay (2), the operating circuit of described chip load (1) is the switching circuit that is made of two triodes and resistor-capacitor unit, it is characterized in that: described relay (2) does not have independent working line, but is connected between chip load (1) and the switching circuit.

2. the baking box timer circuit of a kind of low-power consumption according to claim 1, it is characterized in that: described switching circuit formation is: the power supply (VDD) that holds the resistance pattern is connected to the emitter of a NPN triode, the base stage of the collector electrode of a NPN triode and PNP triode links together after through a resistance (R2), be parallel with two diode in series (D1, D2) on the emitter of two triodes, diode (D2) connects the emitter place of NPN pipe, ground connection; Also and electric capacity (C1) is arranged, this two-way of the emitter utmost point of the collector electrode of PNP pipe and NPN pipe is connected to chip load (1) between the emitter and collector of PNP triode, and the chip load has feedback line to be connected to the base stage of NPN pipe.

3. the baking box timer circuit of a kind of low-power consumption according to claim 2, it is characterized in that: relay (2) is connected in parallel on the emitter and collector two ends of PNP triode, with the collector electrode junction operating current (VCC) is arranged, form series relationship with whole switching circuit.