JP2001258154A5 - - Google Patents

Claims (13)

  A commercial power supply, a rectifying circuit for rectifying the commercial power supply, a transformer connected to the rectifying circuit, a switching element for switching a current flowing through the transformer, an oscillator for operating the switching element, and a secondary of the transformer A voltage detection circuit for detecting a voltage corresponding to the load voltage on the side, a transmission means for transmitting the output of the voltage detection circuit to the primary side of the transformer, and a duty cycle of the oscillator output is controlled by the output of the transmission means A first comparator circuit; and a second comparator circuit having a hysteresis characteristic for comparing an output of the transmission means and a reference voltage on a primary side of the transformer, wherein a duty cycle of the switching element is set to the first comparator. And controlling the on / off operation of the switching element through the second circuit. Switching power supply device and controls based on the comparator circuit.   The switching power supply according to claim 1, wherein the second comparator circuit is configured by a single comparator using positive feedback.   A commercial power supply, a rectifying circuit for rectifying the commercial power supply, a transformer connected to the rectifying circuit, a switching element for switching a current flowing through the transformer, an oscillator for operating the switching element, and a secondary of the transformer A voltage detection circuit for detecting a voltage corresponding to the load voltage on the side, a transmission means for transmitting the output of the voltage detection circuit to the primary side of the transformer, and a duty cycle of the oscillator output is controlled by the output of the transmission means A first comparator circuit, and a second comparator circuit having a time constant circuit for comparing a reference voltage with an output of the transmission means on a primary side of the transformer, and setting a duty cycle of the switching element to the first Control is performed via a comparator circuit, and the on / off operation of the switching element is controlled by a second comparator. Switching power supply device and controls based on the capacitor circuit.   A commercial power supply, a first rectifier circuit for rectifying the commercial power supply, a transformer connected to the first rectifier circuit, a switching element for switching a current flowing through the transformer, and a second for rectifying the commercial power supply. A rectifier circuit, a capacitor provided in series between the commercial power supply and the second rectifier circuit, an oscillator for receiving the output of the second rectifier circuit and operating the switching element, and two transformers A voltage detection circuit for detecting a voltage corresponding to the load voltage on the secondary side, a transmission means for transmitting the output of the voltage detection circuit to the primary side of the transformer, and a duty cycle of the oscillator output is controlled by the output of the transmission means And a second comparator circuit that compares the output of the transmission means with a reference voltage on the primary side of the transformer, and the switch The duty cycle of the grayed elements to control via said first comparator circuit, a switching power supply unit and controls based on the on-off operation in the second comparator circuit of the switching element.   A commercial power supply, a rectifying circuit for rectifying the commercial power supply, a transformer connected to the rectifying circuit, a switching element for switching a current flowing through the transformer, an oscillator for operating the switching element, and a secondary of the transformer A voltage detection circuit for detecting a voltage corresponding to the load voltage on the side, and the load voltage detected by the voltage detection circuit with the detection circuit is compared with a reference voltage, and the switching operation of the switching element is performed based on the comparison result. A switching power supply device comprising a comparator circuit to be controlled, wherein the comparator circuit is composed of one comparator having hysteresis characteristics.   6. The switching power supply device according to claim 5, wherein the comparator having the hysteresis characteristic is a comparator using positive feedback.   7. A switching power supply apparatus comprising: a power supply according to claim 5 or 6 having a control circuit that shifts from an intermittent operation to a continuous operation by an external control signal.   A commercial power source, a first rectifier circuit that rectifies the commercial power source, a transformer connected to the commercial power source and operable at a commercial frequency, and a pulse that operates intermittently in response to the output of the first rectifier circuit. A generator, a bidirectional switching element that switches current supply to the transformer according to the output of the pulse generator, and a second rectifier circuit that rectifies the secondary output of the transformer, The switch element operates in synchronization with the phase of the commercial power supply, and a charge storage element is provided on the downstream side of the second rectifier circuit, and the charge stored in the charge storage element is output while the switch element is off. The switching power supply device characterized by the above-mentioned.   9. The power supply device according to claim 8, wherein the switching element includes a zero-cross switch, the zero-cross switch selects a zero-cross point having a voltage of 0 or a current of zero or a zero-cross point having directionality, and the switching element is set to the zero-cross point. Switching power supply device characterized by operating.   10. The power supply device according to claim 8, further comprising a load current detection circuit that detects a load current of the power supply device, wherein the control circuit detects the switch element according to the load current detected by the load current detection circuit. A switching power supply that is controlled to be opened and closed intermittently.   A commercial power inlet, a first rectifier circuit that rectifies the current taken from the commercial power inlet, a transformer connected to the commercial power inlet, and an output from the first rectifier circuit intermittently A bi-directional switching element that switches the current supply to the transformer according to the output of the pulse generator, and a second rectifier circuit that rectifies the secondary output of the transformer A capacitor is provided in series between the commercial power supply inlet and the first rectifier circuit, and a charge storage element is provided on the downstream side of the second rectifier circuit, while the switching element is off, A power-saving electrical device comprising a power supply device that outputs charges accumulated in the charge accumulation element.   12. The power saving electrical apparatus according to claim 11, wherein the switching element is composed of one circuit.   The power-saving electrical device according to claim 11 or 12, wherein the power supply device further includes a load current or load voltage detection circuit that detects a load current or load voltage of the power supply device, and operates the pulse generator. The control circuit for controlling controls the operation of the pulse generator so as to intermittently open and close the open / close element according to the load current or load voltage detected by the load current or load voltage detection circuit. Electric power equipment.