The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 1991
Filed:
May. 31, 1989
Jeong Y Kim, Seoul, KR;
Sang Wook Suh International, Seoul, KR;
Abstract
An output control circuit of a 4-burner electronics induction heating cook system comprises a unit for measuring the proportional setting time to selectively operate the timing on-off control and the frequency control of a heating load; an invertor circuit for generating a proportional time and applying this to the load; a current feedback/output adjusting circuit provided with a differential amplifier inputing a high or low level signal according to a signal from the current detector; an output setting control portion provided with a unit for comparing the signals from the circuit connected to the adjusting circuit and the saw tooth wave generating circuit and then outputing a pulse width modulation signal; an output setting control portion provided with at least one photocoupler wired in an OR configuration to control the operation of the control portion and a microprocessor connected to control the operation of the photocouplers; a base operating portion and a timing circuit for controlling an invertor circuit, thereby preventing current surges generated by the maximum outputing step and for preventing noise caused by the mutual interference field generated between plural heating areas at the minimum output step.