Title:
POWER SUPPLY FOR DRIVING MAGNETRON
Document Type and Number:
Japanese Patent JP3031782
Kind Code:
B2
Abstract:
PURPOSE: To prevent overcurrent in a magnetron while reducing the size of a power supply by performing PWM control through a first feedback means for feeding back a voltage induced in a transformer inducing a square wave voltage on the secondary through switching action, and a secondary feedback means for feeding back the current of the magnetron.
CONSTITUTION: A PWM control section 80 receives a feedback value of the output voltage, i.e., a voltage induced in the coil N3 of a transformer 20, through a first feedback means 30 and controls the duty ratio of the primary voltage of the transformer 20 by controlling the ON/OFF time of a switching means 90 thus stabilizing the output voltage. Furthermore, in order to prevent the voltage from being unstabilized due to abrupt variation in the current of a magnetron 50, a voltage induced on the secondary of a transformer 60 sensing the current of the magnetron 50 is fed back to the PWM control section 80 through a second feedback means 70 and applied to the magnetron 50 through the switching means 90 thus stabilizing the output voltage while preventing overcurrent.
Inventors:
Lee, Kyung-Kun
Application Number:
JP12315292A
Publication Date:
April 10, 2000
Filing Date:
May 15, 1992
Export Citation:
Assignee:
Samsung Electronics Company Limited
International Classes:
H02M3/28; H02M3/335; H02M7/06; G05F1/10; H05B6/66; H05B6/68; (IPC1-7): H02M3/28; G05F1/10; H02M7/06
Domestic Patent References:
| JP1131291U |
Attorney, Agent or Firm:
Yasuo Miyoshi (1 outside)