Synchronous switching power supply comprising buck converter
First Claim
1. Switching power supply for converting AC or pulsating DC input signal into output signal, comprising:
- a node;
a switch means responsive to a single control signal for selectively applying the input signal of one polarity to the node;
an inductive means coupled to the node for attaining a current;
a rectifying means coupled between the node and ground for conducting the current;
a capacitive means coupled between the inductive means and ground for providing the output signal;
a first comparator means for comparing the input signal against a first signal;
a second comparator means for comparing the output signal against a second signal; and
a control means responsive to the first and second comparator means for providing the single control signal.
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Abstract
The synchronous switching power supply can be employed in multiple output power supply systems requiring extremely high efficiency and low number of components. The input signal may be AC or pulsating DC. A single switch is switched at zero voltage and current. The short circuit protection is inherent. A switching power supply with buck converter includes a switch for selectively applying the input signal of one polarity to a node, an inductor coupled to the node for attaining a current, a rectifier coupled between the node and ground for conducting the current, a capacitor coupled between the inductor and ground for providing the output signal, a first comparator for comparing the input signal against a first signal, a second comparator for comparing the output signal against a second signal, and a control circuit responsive to the first and second comparators for controlling the switch.
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Citations
5 Claims
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1. Switching power supply for converting AC or pulsating DC input signal into output signal, comprising:
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a node; a switch means responsive to a single control signal for selectively applying the input signal of one polarity to the node; an inductive means coupled to the node for attaining a current; a rectifying means coupled between the node and ground for conducting the current; a capacitive means coupled between the inductive means and ground for providing the output signal; a first comparator means for comparing the input signal against a first signal; a second comparator means for comparing the output signal against a second signal; and a control means responsive to the first and second comparator means for providing the single control signal. - View Dependent Claims (2, 3, 4, 5)
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Specification