DC-DC CONVERTER AND POWER SUPPLYING SYSTEM USING SAME
First Claim
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1. A DC-DC converter comprising:
- a first input-output circuit;
first and second capacitors connected in series;
a second input-output circuit connected to the first and second capacitors;
a switching part, responsive to switching signals comprising;
a first switch configured to connect a positive side terminal of the first input-output circuit to a positive terminal of the first capacitor and a positive side terminal of the second input-output circuit;
a second switch configured to connect the positive side terminal of the first input-output circuit to a negative terminal of the first capacitor and a positive terminal of the second capacitor;
a third switch configured to connect a negative side terminal of the first input-output circuit to the negative terminal of the first capacitor and the positive terminal of the second capacitor; and
a fourth switch configured to connect the negative side terminal of the first input-output circuit to a negative terminal of the second capacitor and the negative side terminal of the second input-output circuit;
a voltage detector to detect voltages across the first and second capacitors and a voltage through the first and second capacitors; and
a control circuit part configured to generate the switching signals control on the basis of the voltage through the first and second capacitors, calculate a difference between the voltages across first and second capacitors and controls a duty ratio of at least one of the switching signals on the basis of the difference so as to decrease the difference.
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Abstract
A DC-DC converter includes first and second capacitors connected in series, a switching part, and a control circuit part which includes a voltage difference calculating part for calculating a difference between voltages of the first and second capacitors, a duty ratio controller for controlling duty ratio of on- and OFF-durations to decrease the voltage difference of the first and second capacitors on the basis of the calculated difference. A power supplying system including the DC-DC converter controls balance between first and second capacitors in voltage on the basis of the powering/regenerating discriminating signal.
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Citations
7 Claims
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1. A DC-DC converter comprising:
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a first input-output circuit; first and second capacitors connected in series; a second input-output circuit connected to the first and second capacitors; a switching part, responsive to switching signals comprising; a first switch configured to connect a positive side terminal of the first input-output circuit to a positive terminal of the first capacitor and a positive side terminal of the second input-output circuit; a second switch configured to connect the positive side terminal of the first input-output circuit to a negative terminal of the first capacitor and a positive terminal of the second capacitor; a third switch configured to connect a negative side terminal of the first input-output circuit to the negative terminal of the first capacitor and the positive terminal of the second capacitor; and a fourth switch configured to connect the negative side terminal of the first input-output circuit to a negative terminal of the second capacitor and the negative side terminal of the second input-output circuit; a voltage detector to detect voltages across the first and second capacitors and a voltage through the first and second capacitors; and a control circuit part configured to generate the switching signals control on the basis of the voltage through the first and second capacitors, calculate a difference between the voltages across first and second capacitors and controls a duty ratio of at least one of the switching signals on the basis of the difference so as to decrease the difference. - View Dependent Claims (4, 5, 6, 7)
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2. A DC-DC converter comprising:
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a first input-output circuit; first and second capacitors connected in series; a second input-output circuit connected to the first and second capacitors; a switching part, responsive to switching signals comprising; a first diode configured to connect a positive side terminal of the first input-output circuit to a positive terminal of the first capacitor and a positive side terminal of the second input-output circuit; a first switch configured to connect the positive side terminal of the first input-output circuit to a negative terminal of the first capacitor and a positive terminal of the second capacitor; a second switch configured to connect a negative side terminal of the first input-output circuit to the negative terminal of the first capacitor and the positive terminal of the second capacitor; and a second diode configured to connect the negative side terminal of the first input-output circuit to a negative terminal of the second capacitor and the negative side terminal of the second input-output circuit; a voltage detector to detect voltages across the first and second capacitors and a voltage through the first and second capacitors; and a control circuit part configured to generate the switching signals control on the basis of the voltage through the first and second capacitors, calculate a difference between the voltages across first and second capacitors and controls a duty ratio of at least one of the switching signals on the basis of the difference so as to decrease the difference.
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3. A DC-DC converter comprising:
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a first input-output circuit; first and second capacitors connected in series; a second input-output circuit connected to the first and second capacitors; a switching part, responsive to switching signals comprising; a first switch configured to connect a positive side terminal of the first input-output circuit to a positive terminal of the first capacitor and a positive side terminal of the second input-output circuit; a first diode configured to connect the positive side terminal of the first input-output circuit to a negative terminal of the first capacitor and a positive terminal of the second capacitor; a second diode configured to connect the negative terminal of the first capacitor and the positive terminal of the second capacitor to a negative side terminal of the first input-output circuit to; and a second switch configured to connect the negative side terminal of the first input-output circuit to a negative terminal of the second capacitor and the negative side terminal of the second input-output circuit; a voltage detector to detect voltages across the first and second capacitors and a voltage through the first and second capacitors; and a control circuit part configured to generate the switching signals control on the basis of the voltage through the first and second capacitors, calculate a difference between the voltages across first and second capacitors and controls a duty ratio of at least one of the switching signals on the basis of the difference so as to decrease the difference.
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Specification