CN201039507Y - A half bridge drive circuit for electromagnetic heating device - Google Patents

Abstract

The utility model relates to the technical field of an electromagnetism stove, in particular to a half bridge driving circuit of an electromagnetism heating device, comprising a control circuit M, a commutating filtering circuit, a resonance capacitance, an electromagnetism loop L of the electromagnetism stove and two electronic switches K1 and K2 with high frequency. The control ends of the electronic switches with high frequency are connected with the output end of the control circuit M. The electronic switches with high frequency are connected in series in an output loop of the commutating filtering circuit. The commutating filtering circuit comprises a three-phase commutating bridge V and wave-sieving capacitances C1 and C2. The electronic switches K1 and K2 with high frequency are respectively connected in parallel with resonance capacitances C3 and C4. The electromagnetism loop L is connected between the connecting point of the wave-sieving capacitances C1 and C2 and the connecting point of the resonance capacitances C3 and C4. A guide and communication signal is sent alternately to the two electronic switches K1 and K2 by the control circuit M. A double tuning circuit consisting of the electromagnetism loop L, the resonance capacitances C3 and C4 continuously keeps guiding and communicating to improve the heating power and the heating is not stopped because a boiler tool is not at a stove opening.

Description

A kind of half-bridge drive circuit of electromagnetic heating apparatus

Technical field:

The utility model relates to the electromagnetic stove technical field, refers in particular to a kind of half-bridge drive circuit of electromagnetic heating apparatus.

Background technology:

At present, what the drive circuit of existing electromagnetic stove adopted is single switch tuning circuit, and heating power is low, and in use when pan leaves the kitchen range mouth, this drive circuit heats owing to losing tuning stopping, and uses very inconvenient.

The utility model content:

The purpose of this utility model is exactly the half-bridge drive circuit that a kind of electromagnetic heating apparatus is provided at the deficiency of prior art existence.

To achieve these goals, the technical solution adopted in the utility model is: comprise control circuit M, current rectifying and wave filtering circuit, resonant capacitance, the solenoid L of electromagnetic stove and two high frequency electronic switch K1, K2, the control end of high frequency electronic switch is connected with the output of control circuit M, high frequency electronic switch is connected in the output loop of current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit comprises three-phase commutation bridge V and filter capacitor C1, C2, high frequency electronic switch K1, K2 is parallel with resonant capacitance C3 respectively, C4 is at filter capacitor C1, the tie point of C2 and resonant capacitance C3, be connected with solenoid L between the tie point of C4.

After adopting the foregoing circuit structure, alternately send Continuity signal by control circuit M to two high frequency electronic switch K1, K2, form double-tuned circuit conducting work continuously by solenoid L and resonant capacitance C3, C4, improved heating power, and can not stop heating because of pan leaves the kitchen range mouth.

Description of drawings:

Fig. 1 is a circuit diagram of the present utility model.

Embodiment:

See shown in Figure 1, the utility model comprises control circuit M, current rectifying and wave filtering circuit, resonant capacitance, the solenoid L of electromagnetic stove and two high frequency electronic switch K1, K2, the control end of high frequency electronic switch is connected with the output of control circuit M, high frequency electronic switch is connected in the output loop of current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit comprises three-phase commutation bridge V and filter capacitor C1, C2, high frequency electronic switch K1, K2 is parallel with resonant capacitance C3 respectively, C4 is at filter capacitor C1, the tie point of C2 and resonant capacitance C3, be connected with solenoid L between the tie point of C4.

The circuit working principle: three-phase alternating-current supply A, B, C are direct current through three-phase commutation bridge V rectification, direct current after the rectification is output galvanic current stream after filtering again, control circuit M alternately sends Continuity signal to two high frequency electronic switch K1, K2, make direct current alternately flow through K1, L, C2 to negative pole from positive pole, and pass through C1, L, K2 to negative pole, C3, C4 and L form resonant circuit, and C3 and C4 also have cushioning effect simultaneously concurrently, reduce the loss of HF switch K1, K2.Control circuit M is by the frequency of the control signal that sends and can change the ON time of K1, K2 at interval, thereby reaches the purpose that changes heating power.

Claims (1)

1. the half-bridge drive circuit of an electromagnetic heating apparatus, comprise control circuit M, current rectifying and wave filtering circuit, resonant capacitance, the solenoid L of electromagnetic stove and two high frequency electronic switch K1, K2, the control end of high frequency electronic switch is connected with the output of control circuit M, high frequency electronic switch is connected in the output loop of current rectifying and wave filtering circuit, it is characterized in that: described current rectifying and wave filtering circuit comprises three-phase commutation bridge V and filter capacitor C1, C2, high frequency electronic switch K1, K2 is parallel with resonant capacitance C3 respectively, C4 is at filter capacitor C1, the tie point of C2 and resonant capacitance C3, be connected with solenoid L between the tie point of C4.

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