CN2684456Y

CN2684456Y - An auxiliary power circuit for electromagnetic oven

Info

Publication number: CN2684456Y
Application number: CN 200420015334
Authority: CN
Inventors: 陈俊平
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-02-07
Filing date: 2004-02-07
Publication date: 2005-03-09
Anticipated expiration: 2014-02-07

Abstract

The utility model relates to an auxiliary power supply for supplying with the radiation fan of an electromagnetic oven, etc. The power supply adopts a current mutual inductor and makes use of the load current passes the primary coil of the current mutual inductor and the current directly proportional with the load current in a secondary coil is supplied with the radiation fan after the current rectified and filtered. Compared with the prior art, the utility model does not need adding a control circuit, can realize automatically opening or closing the radiation fan, is favourable for simplifying the integrated circuit, decreases the volume and the weight, reduces the production cost and enhances the reliability of controlling.

Description

A kind of electromagnetic oven auxiliary power circuit

Technical field

The utility model belongs to a kind of powered by direct current circuit, is specifically related to a kind of power supply of electromagnetic oven auxiliary circuit.

Background technology

The radiator fan of existing electromagnetic oven, its output power is generally 3-5W, accounts for more than 80% of electromagnetic oven accessory power supply gross power, and the weight and volume of accessory power supply all occupies bigger deal in whole electromagnetic oven.At present, the electromagnetic oven accessory power supply generally adopts the Industrial Frequency Transformer step-down, after rectifying and wave-filtering and voltage stabilizing, open, stop by control circuit control again, realization is powered to radiator fan, the entire circuit complex structure, and cost is higher, and exist Industrial Frequency Transformer easily to cause the hot-tempered acoustic jamming of power frequency, be subject to the high frequency magnetic field influence in the electromagnetic oven and cause heating.

Electromagnetic oven also can adopt the ac fan heat radiation, directly drives by civil power, though like this without accessory power supply, owing to the Heavy Weight of ac fan own, cost height, and the difficult adjusting of rotating speed, opening, stop and must control by relay, this has increased total cost again.So this scheme seldom adopts.

Adopt high frequency switch power as accessory power supply, be the scheme of radiator fan power supply simultaneously, though little, the lightweight advantage of volume is arranged, complex structure, cost height easily cause unnecessary High-frequency Interference again, and reliability is low, has increased the production difficulty of electromagnetic oven.

The utility model content

The electromagnetic oven accessory power supply of the invention utilizes the electromagnetic oven load current to obtain auxiliary current by current transformer, have and can control automatically that radiator fan is followed electromagnetic oven work and the characteristics that turn round, thus textural omit radiator fan open, stop control circuit.

This electromagnetic oven accessory power supply is owing to adopt current transformer to obtain auxiliary current, make accessory power supply itself have in light weight, volume is little, advantage simple in structure, that the cost cost is low.

Therefore, the purpose of this utility model is to provide a kind of control easy, simple in structure, and the cheap electromagnetic oven auxiliary power circuit of cost.

Its purpose realizes like this:

A kind of electromagnetic oven accessory power supply, comprise a current transformer, the a pair of terminal that passes through for the electric current of electromagnetic oven load current or reflection electromagnetic oven load current signal is drawn in this current transformer primary coil end, the end of current transformer secondary coil is connected to a current rectifying and wave filtering circuit, and draws two-terminal as the accessory power supply exit by filter element.

Like this, when electromagnetic oven loading coil electric current passes through the current transformer primary coil, just produce an electric current that is directly proportional with load current at the current transformer secondary coil, this electric current can be used as the accessory power supply use after current rectifying and wave filtering circuit rectification, filtering, for radiator fan etc. provides electric current.

The drawing explanation

Fig. 1 is a kind of concrete circuit structure diagram of the utility model;

Fig. 2 is the circuit diagram of a kind of concrete application of the utility model.

Fig. 3 is the another kind of concrete circuit diagram of using of the utility model;

The third concrete circuit diagram of using of Fig. 4 the utility model;

The 4th kind of concrete circuit diagram of using of Fig. 5 the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is done concrete detailed description the in detail:

With reference to Fig. 1, Fig. 2 or Fig. 3, the accessory power supply of embodiment, comprise current transformer L2, at the secondary coil N2 of current transformer L2 and be connected to the circuit that forms by diode D and electrochemical capacitor C serial connection, the primary coil N1 of current transformer L2 is serially connected in the electromagnetic oven loading coil LAC circuit, transistor Q2, resistance R 45, resistance R 46 constitute the switching circuit in loading coil LAC loop, be connected to radiator fan motor MD on electrochemical capacitor C, capacitor C 16 is that resonant capacitance, capacitor C 17 are the filter capacitor of power supply VCC.

When A1 gets when electric, electric current is after filter capacitor C17 filtering, enter oscillating circuit, under switching circuit cut-offs effect, produce higher-order of oscillation electric current, electric current makes electromagnetic oven work through loading coil LAC, the load current primary coil N1 that flows through simultaneously, produce an electric current that is directly proportional with load current in secondary coil N2, this electric current is motor M D power supply after diode D rectification, electrochemical capacitor C filtering.

Usually the operating current mean value of electromagnetic oven stone or metal plate for standing a stove on as a precaution against fire is 5-10A, and the operating current of radiator fan is 0.2-0.3A, and the number of turn of primary coil N1 is chosen for 1, and the number of turn of secondary coil N2 can be chosen 10-20, promptly can be radiator fan suitable operating current is provided.

With reference to Fig. 1 and Fig. 4, the accessory power supply of embodiment, comprise current transformer L2, at the secondary coil N2 of current transformer L2 and be connected to the circuit that forms by diode D and electrochemical capacitor C serial connection, the primary coil N1 of current transformer L2 is serially connected in the loop of electromagnetic oven loading coil LAC and resonant capacitance C16 parallel circuits, transistor Q2, resistance R 45, resistance R 46 constitute the switching circuit in above-mentioned loop, be connected to radiator fan motor MD on electrochemical capacitor C, capacitor C 17 is the filter capacitor of power supply VCC.

When A1 gets when electric, electric current is after filter capacitor C17 filtering, enter oscillating circuit, under switching circuit cut-offs effect, produce higher-order of oscillation electric current, electric current makes electromagnetic oven work through loading coil LAC, the loop current of the reflected load electric current primary coil N1 that flows through, produce an electric current that is directly proportional with loop current in secondary coil N2, this electric current is motor M D power supply after diode D rectification, electrochemical capacitor C filtering.

With reference to Fig. 1 and Fig. 5, the accessory power supply of present embodiment, comprise current transformer L2, on three secondary coil N2 of current transformer L2 all and be connected to the circuit that forms by diode D and electrochemical capacitor C serial connection, the primary coil N1 of current transformer L2 is serially connected in the electromagnetic oven loading coil LAC circuit, transistor Q2, resistance R 45, resistance R 46 constitutes the switching circuit in loading coil LAC loop, on electrochemical capacitor C, be connected to radiator fan motor MD, other electrochemical capacitors C goes up the direct voltage that obtains and can be used as accessory power supply for otherwise power supply, and capacitor C 16 is a resonant capacitance, capacitor C 17 is the filter capacitor of power supply VCC.

The utlity model has lower advantage:

1, electromagnetic oven accessory power supply system utilizes the electromagnetic oven load current by transformer induced acquisition, And be used for the work of supply radiator fan, have and can automatically control radiator fan and follow electromagnetic oven work And the characteristics of running, thereby textural omit radiator fan open, stop control circuit.

2, obtain auxiliary current by current transformer, make accessory power supply itself have in light weight, Volume is little, advantage simple in structure, that the cost cost is low.

3, utilize the load current of electromagnetic oven to produce induction by transformer and obtain accessory power supply, also Can avoid adopting Industrial Frequency Transformer to obtain accessory power supply, exist to be subject to the impact of electromagnetic oven high frequency magnetic field And cause generating heat.

Claims

1, a kind of electromagnetic oven auxiliary power circuit, it is characterized in that, it comprises a current transformer, the a pair of terminal that passes through for the electric current of electromagnetic oven load current or reflection electromagnetic oven load current signal is drawn in this current transformer primary coil end, the end of current transformer secondary coil is connected to a current rectifying and wave filtering circuit, and draws two-terminal as the accessory power supply exit by filter element.

According to the electromagnetic oven accessory power supply of claim 1, it is characterized in that 2, the secondary coil of current transformer has more than two or two.

According to the electromagnetic oven accessory power supply of claim 1 or 2, it is characterized in that 3, the primary coil of current transformer is a circle, secondary coil is the 10-20 circle.