Resonant switching power source apparatus
First Claim
1. A resonant switching power source apparatus comprising:
- a first switching element and a second switching element that are connected in series between output terminals of a DC power source and are alternately turned on and off;
a series resonant circuit having a primary winding of a transformer and a current resonance capacitor and connected in parallel with the second switching element;
a controller configured to control ON/OFF operation of the first and second switching elements;
a rectifying/smoothing circuit configured to rectify and smooth a voltage, which is generated on a secondary winding of the transformer during an ON period of the second switching element controlled by the controller, and output the rectified-smoothed voltage; and
a current detector configured to detect a current passing through the series resonant circuit; and
an over current protector of the controller configured to turn off the first and second switching elements for a predetermined period to reset excitation energy of the transformer as the current detector detects a predetermined current value.
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Accused Products
Abstract
A resonant switching power source apparatus has a first switching element and second switching element being connected in series between output terminals of a DC power source and are alternately turned on and off; a series resonant circuit having a primary winding of a transformer and a current resonance capacitor and connected in parallel with the second switching element; a controller to control the first and second switching elements; a rectifying/smoothing circuit to rectify and smooth a voltage, which is generated on a secondary winding of the transformer during an ON period of the second switching element, and output the rectified-smoothed voltage; a current detector to detect a current passing through the series resonant circuit; and an overcurrent protector to turn off the first and second switching elements for a predetermined period so that excitation energy of the transformer is reset, if the current detector detects a predetermined current value.
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Citations
7 Claims
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1. A resonant switching power source apparatus comprising:
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a first switching element and a second switching element that are connected in series between output terminals of a DC power source and are alternately turned on and off; a series resonant circuit having a primary winding of a transformer and a current resonance capacitor and connected in parallel with the second switching element; a controller configured to control ON/OFF operation of the first and second switching elements; a rectifying/smoothing circuit configured to rectify and smooth a voltage, which is generated on a secondary winding of the transformer during an ON period of the second switching element controlled by the controller, and output the rectified-smoothed voltage; and a current detector configured to detect a current passing through the series resonant circuit; and an over current protector of the controller configured to turn off the first and second switching elements for a predetermined period to reset excitation energy of the transformer as the current detector detects a predetermined current value. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling a resonant switching power source apparatus having a first switching element and second switching element that are connected in series between output terminals of a DC power source and are alternately turned on and off, a series resonant circuit containing a primary winding of a transformer and a current resonance capacitor and connected in parallel with the second switching element, and a controller configured to control ON/OFF operation of the first and second switching elements, the method comprising:
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detecting a current passing through the series resonant circuit; detecting whether or not the detected current is equal to or larger than a first current value; detecting whether or not the detected current is equal to or larger than a second current value that is larger than the first current value; as the first current value is detected, turning off the first switching element; and as the second current value is detected, turning off the first and second switching elements for a predetermined period so that excitation energy of the transformer is reset.
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7. A method of controlling a resonant switching power source apparatus having a first switching element and second switching element that are connected in series between output terminals of a DC power source and are alternately turned on and off, a series resonant circuit containing a primary winding of a transformer and a current resonance capacitor and connected in parallel with the second switching element, and a controller configured to control ON/OFF operation of the first and second switching elements, the method comprising:
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detecting a current passing through the series resonant circuit; detecting whether or not the detected current of the series resonant circuit is equal to or larger than a first current value; detecting a current passing through the second switching element; detecting whether or not the detected current of the second switching element is equal to or larger than a second current value that is larger than the first current value; as the first current value is detected, turning off the first switching element; and as the second current value is detected, turning off the first and second switching elements for a predetermined period so that excitation energy of the transformer is reset.
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Specification