Patent
Induction heating apparatus with negative feedback controlled pulse generation
TLDR
In this paper, an induction heating apparatus includes a DC power source, a transistor for generating a trigger current in response to a base drive pulse applied thereto, and a resonant load circuit including a work coil and a capacitor.Abstract:
An induction heating apparatus includes a DC power source, a transistor for generating a trigger current in response to a base drive pulse applied thereto, and a resonant load circuit including a work coil and a capacitor for generating in response to the trigger current an oscillating resonant current when the switching device is turned off, and which current is passed through a diode connected in inverse parallel relation with the transistor. A current transformer is provided to detect the load current. A low voltage detector senses a nearly zero voltage at the collector of the transistor and triggers a ramp generator to generate a ramp voltage which is compared with a reference voltage to generate a train of base drive pulses for application to the transistor. To control the base drive pulses at a variable duration in accordance with an inductive load, the reference voltage is varied as an inverse function of the sensed load current.read more
Citations
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Patent
Induction Heating Apparatus
TL;DR: When a pan made of a non-magnetic material, such as aluminum, is used for cooking while the is being controlled, notification is made to the user to the effect that the temperature control function has been stopped and the temperature should be manually adjusted as discussed by the authors.
Patent
Rapid heating, uniform, highly efficient griddle
TL;DR: In this paper, a fast heating, highly efficient griddle with interchangeable griddle plates including magnetically permeable materials having Curie temperatures which may be the same or different to provide different cooking temperatures is provided.
Patent
Method of adhesive bonding by induction heating
TL;DR: In this paper, an induction heating tool is used to emit the magnetic field at its work coil, and an electronic controller measures the energy being used by a power converter that generates the alternating current driving the work coil which creates the magnetic fields.
Patent
Heating systems and methods
TL;DR: In this article, a heater coil is inductively coupled to an article and a current signal is supplied to the heater coil, which generates a magnetic flux, based on the applied current signal, for inductively heating the article.
Patent
Small load detection by comparison between input and output parameters of an induction heat cooking apparatus
TL;DR: In this article, a comparator is used to compare the input and output parameters of the inverter and latches a bistable device when the input power is smaller than the output power.
References
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Patent
Switching regulator sweep starting protection circuit
TL;DR: In this article, an overload protection system for a switching power supply includes a variable rate and variable pulse duration drive source for operating the switching transistor, which is driven with low repetition rate pulses having a predetermined time duration.
Patent
Induction heating apparatus with means for detecting zero crossing point of high-frequency oscillation to determine triggering time
TL;DR: In this article, a zero crossing point detector is used to detect the occurrence of each zero point of high frequency energization current, and a timing circuit is provided to provide timing action in response to the detected zero crossing points.
Patent
Induction heating apparatus
Iwao Higuchi,Takashi Fujita +1 more
TL;DR: In this article, an induction heating apparatus consisting of a DC power source, a series resonant circuit of a heating coil and capacitance connected between the terminals of the DC Power Source, a diode connected in parallel with the capacitor and in polarity-reversed relation to the DC power Source, and a transistor having a collector-emitter path connected with the capacitance, is presented, with a control circuit for controlling the conductive state of the transistor according to the magnitude and direction of a current flowing through the heating coil.
Patent
Power circuit for induction heating
TL;DR: In this paper, a power circuit for use in billet heating, surface heat treating and melting and protective circuitry associated therewith is presented. But the power circuit is not suitable for the use in nuclear power plants.
Patent
Constant power supply employing a variable frequency inverter
TL;DR: In this article, a constant power control circuit adjusts the inverter frequency to compensate for deviation of the output power away from a linear approximation of a power curve, where signals proportional to the output current and voltage are fed to a function generator which implements the linear approximation function.