US 7,599,197 B2Granted

Power supply apparatus

AssigneeSansha Electric Manufacturing Company, Limited

InventorsHideo Ishii, Tetsuro Ikeda, Kenzo Danjo

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Abstract

A rectifying circuit (18) converts inputted AC power to DC power. An inverter circuit (22) converts the DC power to high-frequency power in accordance with a switching control signal applied thereto from a control circuit (50). A voltage transformer (24) voltage-transforms the voltage of the high-frequency power. An output-side rectifying circuit (40) rectifies the voltage-transformed power. An output detecting circuit (34) detects the magnitude of the voltage of the rectified power, and a signal representative of the detected voltage is applied to the control circuit (50). The control circuit (50) generates such a switching control signal as to make the rectified power have a predetermined value. The value of the voltage from the rectifying circuit (18) is detected by an input detecting circuit (62), and a signal representative of the detected voltage is applied to the control circuit (50). The control circuit (50) controls the operation of the inverter circuit (22) in accordance with the detected voltage representative signal from the input detecting circuit (62) and the saturation magnetic characteristic of the voltage-transformer (24).

Claims6

Dependent claims

A power supply apparatus comprising:

converting means for converting input AC power to DC power;
switching means receiving said DC power and performing switching operation in accordance with a switching control signal, for converting said DC power to high-frequency power;
a voltage transformer for transforming a voltage of said high-frequency power;
rectifying means for rectifying the power as voltage-transformed by said voltage transformer;
first detecting means for detecting a magnitude of said rectified power, a voltage of said rectified power, or a current of said rectified power and developing a first detection signal representative of the detected magnitude of power, voltage or current;
error signal generating means for generating an error signal representative of the difference between said first detection signal and a predetermined reference signal;
second detecting means for detecting a voltage value of said DC power and developing a second detection signal representative of the detected voltage value;
triangular waveform generating means for generating a triangular waveform signal;
and
PWM comparing means for comparing said triangular waveform signal with a threshold value, which is a larger one of said second detection signal and said error signal, and generating a PWM control signal for making said switching means ON when said triangular waveform signal is equal to or larger than said threshold value.

7 more elements

A power supply apparatus comprising:

converting means for converting input AC power to DC power;
switching means receiving said DC power and performing switching operation in accordance with a switching control signal, for converting said DC power to high-frequency power;
a voltage transformer for transforming a voltage of said high-frequency power;
rectifying means for rectifying the power as voltage-transformed by said voltage transformer;
first detecting means for detecting a magnitude of one of said rectified power, a voltage of said rectified power, and a current of said rectified power, and developing a first detection signal representative of the detected magnitude;
error signal generating means for generating an error signal representative of the difference between said first detection signal and a predetermined reference signal;
second detecting means for detecting a voltage value of said AC power and developing a second detection signal representative of the detected voltage value;
triangular waveform generating means for generating a triangular waveform signal;
and
PWM comparing means for comparing said triangular waveform signal with a threshold value, which is a larger one of said second detection signal and said error signal, and generating a PWM control signal for making said switching means ON when said triangular waveform signal is equal to or larger than said threshold value.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/706,462Filed 13 Feb 2007
Priority: JP 2006-04391421 Feb 2006
Published: US 2007/0194724 A123 Aug 2007
Granted: 6 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H02M 5/458
Using devices of a triode or transistor type requiring continuous application of a control signal: using semiconductor devices only
H02M 7/53871
In a bridge configuration: with automatic control of output voltage or current
H02M
Apparatus for conversion between ac and ac, between ac and dc, or