Abstract: The heat radiating device of an induction heater comprises a body, a heat radiating unit, and a ventilating unit. The body comprises a bottom housing provided at the front end thereof with a plurality of air admitting holes. The heat radiating unit is mounted on the air admitting holes and composed of a fan. The ventilating unit is disposed in the upper portion of the rear end of the body and provided with a ventilating seat and a horizontal air duct with an outlet whose level is higher than the bottom of the mounting portion of the body. The cool air is drawn in form the air admitting holes while the hot air is let out from the ventilating holes of the ventilating unit.

Abstract: A power transistor driving circuit for use in an electromagnetic induction heating device comprises an induction coil circuit and a driving circuit. The induction coil circuit is provided with an induction connected with an oscillating circuit made up of capacitances and resistances. The oscillating circuit is provided with at least one power transistor for producing a high frequency switching. The driving circuit comprises at least one quick switching circuit provided with two transistors between which a resistance and an inductance are connected therewith in series. One end of the inductance is connected with the gate of the power transistor for accelerating the reverse current flow of the gate so as to shorten the switching time of the power transistor and to reduce the switching power loss of the power transistor at the time when the power transistor is turned off.

Abstract: A dual push-pull heating device of induction cooker having multiple burners is provided with a microprocessor controlling a logic amplifying drive circuit outputting a high-frequency pulse signal, so as to drive alternately at least a power element or power transistor having two parallel electromagnetic induction coils arranged at an end thereof in such a manner that a common end of said induction coils is connected with a common connection point of a relay whose normal close point is connected with a non-common end of one of the induction coils and whose normal open point is connected with a non-common end of another one of the induction coils.

Abstract: A dual push-pull induction heating drive circuit comprises an oscillation triggering control circuit regulating the ON-OFF switch of the circuit activation, a switching logic circuit bringing about two exclusive pulse signals serving to drive via an amplifying circuit a dual push-pull switching output circuit having two power elements connected to an induction coil, a pulse width modulating circuit having a controlled comparing element capable of sending out adjustable pulse, and a synchronous detection comparing circuit having at least a comparing element and having an input end in communication with an induction coil and another input end connected with a power source and further having an output end connecting with the switching logic circuit and sending out synchronous pulse signals to a differentiation circuit to bring about synchronous differentiation pulse signals, which are received by the pulse width modulating circuit so as to generate the power control pulse signals serving via the switching logic

Abstract: An ultrasonic iron comprises a metal ironing plate fixedly mounted therein, ultrasonic vibrators and amplitude amplifiers, and a power adjusting circuit provided on suitable inner side thereof, so that the power adjusting circuit is capable of driving the ultrasonic vibrator as to resonate the ironing plate with a high frequency as soon as the ultrasonic iron is switched on. Heat energy is thereby quickly and directly produced between the contact surface of the ironing plate and the clothes when the ultrasonic iron is moved on the clothes back and forth. The heat energy required for the pressing of clothes is available immediately upon the onset of operation of the iron.