ISOLATED SWITCHING POWER SUPPLY APPARATUS
First Claim
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1. An isolated switching power supply apparatus comprising:
- a power factor correction converter including;
a voltage input unit arranged to receive a voltage of a commercial power supply;
a rectifier circuit arranged to rectify the commercial power supply voltage received by the voltage input unit;
at least one boost converter circuit that is connected to a latter stage of the rectifier circuit and includes an inductor, a switching element, and a rectifying element;
a smoothing circuit connected to a latter stage of the boost converter circuit; and
a switching controller arranged to on/off control the switching element so that input current received from the commercial power supply has a shape similar to a shape of the commercial power supply voltage;
a transformer including at least isolated primary and secondary windings;
a switching circuit arranged to switch a voltage to be applied to the primary winding by the smoothing circuit;
a secondary-side rectifying smoothing circuit arranged to rectify and smooth an alternating-current voltage generated in the secondary winding;
a voltage output unit arranged to output a voltage obtained by the secondary-side rectifying smoothing circuit;
a secondary-side output voltage detector arranged to detect a voltage obtained by the secondary-side rectifying smoothing circuit;
a primary-side digital control circuit that is disposed on the primary side of the transformer and includes a switching controller arranged to control on/off operation of at least one of the boost converter circuit and the switching circuit;
a secondary-side digital control circuit that is disposed on the secondary side of the transformer, is arranged to receive the voltage detected by the secondary-side output voltage detector, and includes a feedback controller arranged to generate a feedback signal to control the switching circuit; and
an isolated signal transmitter arranged to perform serial communications between the primary-side and secondary-side digital control circuits while maintaining isolation therebetween.
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Abstract
A switching power supply apparatus includes a PFC converter, a DC-DC converter, and primary-side and secondary-side digital control circuits that control the PFC converter and the DC-DC converter. On the basis of a voltage detected by an output voltage detection circuit, the primary-side digital control circuit transmits data about the on-time of a switching element of the DC-DC converter to the primary-side digital control circuit. On the basis of this data, the primary-side digital control circuit controls the on-time of the switching element.
55 Citations
9 Claims
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1. An isolated switching power supply apparatus comprising:
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a power factor correction converter including; a voltage input unit arranged to receive a voltage of a commercial power supply; a rectifier circuit arranged to rectify the commercial power supply voltage received by the voltage input unit; at least one boost converter circuit that is connected to a latter stage of the rectifier circuit and includes an inductor, a switching element, and a rectifying element; a smoothing circuit connected to a latter stage of the boost converter circuit; and a switching controller arranged to on/off control the switching element so that input current received from the commercial power supply has a shape similar to a shape of the commercial power supply voltage; a transformer including at least isolated primary and secondary windings; a switching circuit arranged to switch a voltage to be applied to the primary winding by the smoothing circuit; a secondary-side rectifying smoothing circuit arranged to rectify and smooth an alternating-current voltage generated in the secondary winding; a voltage output unit arranged to output a voltage obtained by the secondary-side rectifying smoothing circuit; a secondary-side output voltage detector arranged to detect a voltage obtained by the secondary-side rectifying smoothing circuit; a primary-side digital control circuit that is disposed on the primary side of the transformer and includes a switching controller arranged to control on/off operation of at least one of the boost converter circuit and the switching circuit; a secondary-side digital control circuit that is disposed on the secondary side of the transformer, is arranged to receive the voltage detected by the secondary-side output voltage detector, and includes a feedback controller arranged to generate a feedback signal to control the switching circuit; and an isolated signal transmitter arranged to perform serial communications between the primary-side and secondary-side digital control circuits while maintaining isolation therebetween. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9)
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3. An isolated switching power supply apparatus comprising:
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a bridgeless power factor correction converter including; a voltage input unit arranged to receive a voltage of a commercial power supply; a first rectifier circuit including a series circuit of a first switching element and a rectifying element and is connected to a first terminal of the voltage input unit via an inductor; a second rectifier circuit including a series circuit of a second switching element and a rectifying element and is connected to a second terminal of the voltage input unit; a smoothing circuit connected to a latter stage of the second rectifier circuit; and a switching controller arranged to on/off control the first and second switching elements so that input current received from the commercial power supply has a shape similar to a shape of the commercial power supply voltage; a transformer including at least isolated primary and secondary windings; a switching circuit arranged to switch a voltage to be applied to the primary winding by the smoothing circuit; a secondary-side rectifying smoothing circuit arranged to rectify and smooth an alternating-current voltage generated in the secondary winding; a voltage output unit arranged to output a voltage obtained by the secondary-side rectifying smoothing circuit; a secondary-side output voltage detector arranged to detect the voltage obtained by the secondary-side rectifying smoothing circuit; a primary-side digital control circuit that is disposed on the primary side of the transformer and includes a switching controller arranged to control on/off operation of at least one of the first and second rectifier circuits and the switching circuit; a secondary-side digital control circuit that is disposed on the secondary side of the transformer, is arranged to receive the voltage detected by the secondary-side output voltage detector, and includes a feedback controller arranged to generate a feedback signal to control the switching circuit; and an isolated signal transmitter arranged to perform serial communications between the primary-side and secondary-side digital control circuits while maintaining isolation therebetween;
whereinterminals adjacent to the first and second switching elements of the first and second rectifier circuits are connected to each other; and terminals adjacent to the rectifier elements of the first and second rectifier circuits are connected to each other.
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Specification