INDUCTION ELECTRIC HEATING TEMPERATURE CONTROL DEVICE Russian patent published in 2016 - IPC H05B6/06 

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering, electronics, automatic control and can be used for control of industrial and domestic heating devices using induction done temperature conditions. Induction electric heating temperature control device consists of field transistors with control microchip, heating coil, direct current source. Proposed solution comprises induction electric heater in form of parallel LC circuit with core in circuit inductance coil in form of metal thin-walled high-melting crucible, wherein one pole of this circuit is connected to first group field transistors drains, and simultaneously to first inductance coil first terminal and first diode cathode, which anode is connected via first resistor to electrolytic capacitors bank positive potential and first inductance coil second terminal, and directly to second group field transistors gates and second optocouple collector output, wherein parallel LC circuit second pole is connected to second group field transistors drains and simultaneously via second inductance coil to electrolytic capacitors bank positive potential, as well as to second diode cathode, which anode is connected via second resistor to electrolytic capacitors bank positive potential, and directly to first group of field transistors gates and first optocouple collector output, wherein both optocouples emitter outputs are connected to housing, whereto both groups all field transistors sources are also connected, and in-series connected photodiode optocouples are connected to first optocouple photodiode anode via third resistor with industrial controller power supply source positive potential, and by second optocouple photodiode cathode to industrial controller control discrete output, which first and second analogue inputs are connected to outputs of converter, connected by its terminal inputs to thermocouple.

EFFECT: increasing reliability due to excluding possibility of large currents occurrence in drain-source transitions when field transistors switching over and enhancing range of their current loads, as well as increasing energy efficiency due to reduction of power losses when using parallel self-excitation LC circuit in resonance mode.

1 cl, 1 dwg