Title:
AC VOLTAGE CONTROLLER
Document Type and Number:
Japanese Patent JPS63276612
Kind Code:
A
Abstract:
PURPOSE:To control a load voltage to a desired value irrespective of an AC power source frequency, by providing a frequency correcting circuit part for adjusting a control voltage which is compared with the load voltage, in accordance with a frequency of an AC power source. CONSTITUTION:An AC voltage which has been insulated by a transformer 211 is brought to a full-wave rectification, a transistor Q 214 is opened and closed, the operation is inverted by a Q 216, and by a resistance R 217, a capacity C 218 and the Q 216, a relaxation oscillation waveform which has synchronized with a power source period is obtained. A peak value is high because that of 50Hz is a long period. The peak value is held by a diode 220 and a C 229, and brought to an impedance conversion by a differential amplifier 225. This output is subtracted from a control voltage VC by a differential amplifier 226, an R 227 and an R 228, and VCC is outputted. The variation due to a frequency variation of the phase control use pulse width, which is generated, in case an output VL of a load voltage detecting circuit 104 being different by an AC power source frequency is inputted to a phase pulse generating circuit 105 simultaneously with the VCC becomes low to the extent that it has no hindrance for practical use, and a load voltage can be controlled to a desired value irrespective of a power source frequency.
Inventors:
ODA KATSUHIRO
Application Number:
JP11290287A
Publication Date:
November 14, 1988
Filing Date:
May 08, 1987
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G05F5/00; H02M5/257; (IPC1-7): G05F5/00; H02M5/257
Domestic Patent References:
| JP56132611B |
Attorney, Agent or Firm:
Mamoru Takada (1 person outside)