Power-supply device
First Claim
1. A power-supply device including a step-down DC-DC converter, comprising:
- power semiconductor switching components, driving means for driving said power semiconductor switching components, a pulse-width modulation oscillator for supplying said driving means with a driving signal, and an error amplifier for supplying said pulse-width modulation oscillator with an error signal indicating a comparison result between a reference value and an output power, wherein a control loop of said power-supply device includes a power output filter through which said output power passes, and a filter provided independently of said power output filter, an output signal corresponding to said output power being fed back to said error amplifier after having passed through said independently provided filter.
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Accused Products
Abstract
A step-down type DC-DC power-supply device implements both the stabilization of the control loop and the responsibility at the same time. In the power-supply device, an output power signal is fed back to an error amplifier after having passed through a CR smoothing filter provided independently of a power LC smoothing filter. Also, independently of the duty controls over Power MOSFETs, i.e., upper-side/lower-side semiconductor switching components in the steady state, an output from the power LC smoothing filter is added to an upper and lower limit-mode-equipped control circuit, thereby, at the transient state, forcefully setting the duty α at either 0% or 100%.
26 Citations
15 Claims
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1. A power-supply device including a step-down DC-DC converter, comprising:
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power semiconductor switching components, driving means for driving said power semiconductor switching components, a pulse-width modulation oscillator for supplying said driving means with a driving signal, and an error amplifier for supplying said pulse-width modulation oscillator with an error signal indicating a comparison result between a reference value and an output power, wherein a control loop of said power-supply device includes a power output filter through which said output power passes, and a filter provided independently of said power output filter, an output signal corresponding to said output power being fed back to said error amplifier after having passed through said independently provided filter. - View Dependent Claims (2, 3, 4, 5, 9, 11, 12, 13, 14, 15)
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6. A power-supply device of a step-down type DC-DC converter including power-supply device units in plural number, each of said plural power-supply device units, comprising:
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power semiconductor switching components, driving means for driving said power semiconductor switching components, a pulse-width modulation oscillator for supplying said driving means with a driving signal, and an error amplifier for supplying said oscillator with an error signal of an output power, wherein each of said plural power-supply device units includes a power output filter through which said output power passes, and a filter provided independently of said power output filter, an output signal being fed back to said error amplifier after having passed through said independently provided filter. - View Dependent Claims (7, 8)
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10. A hard-disk device which includes a magnetic storage disk, a magnetic head, a magnetic-disk rotating drive, a magnetic-head drive, a magnetic-head position controller, an input/output signal controller, and a power-supply device for supplying power,
said power-supply device being a step-down type DC-DC converter which comprises power semiconductor switching components, driving means for driving said power semiconductor switching components, a pulse-width modulation oscillator for supplying said driving means with a driving signal, and an error amplifier for supplying said oscillator with an error signal of an output power, wherein said step-down type DC-DC converter further comprises a power output filter through which said output power passes, and a filter provided independently of said power output filter, an output signal being fed back to said error amplifier after having passed through said independently provided filter, and wherein said power output filter is an LC filter consisting of an inductor and a capacitor, said independently provided filter being a CR filter consisting of a capacitor and a resistor, said CR filter being connected to said LC filter in parallel, and said output signal being fed back to said error amplifier after having passed through said CR filter.
Specification