DC-DC converter control circuit and DC-DC converter control method
First Claim
1. A DC-to-DC converter control circuit comprising:
- an arithmetic circuit for outputting an add-up signal of an output voltage signal obtained according to an output voltage of a DC-to-DC converter, and an AC current signal obtained according to an AC current component of a coil current; and
a comparator for comparing the add-up signal with a reference signal, wherein switching control is executed according to a result of comparison by the comparator.
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Abstract
There are provided a DC-to-DC converter control circuit capable of implementing compatibility between low ripple voltage characteristics, and stable and fast response characteristics at the time of a sudden change in load, and a DC-to-DC converter control method using the same. An add-up signal of an output voltage signal obtained according to an output voltage of a DC-to-DC converter, and an AC current signal obtained according to an AC current component of a coil current is outputted from an arithmetic circuit, and the add-up signal is compared with a reference signal by a comparator. Switching control of the DC-to-DC converter is executed according to a result of comparison by the comparator. Even if an equivalent series-connected resistance ESR of a smoothing capacitor, connected to an output terminal of the DC-to-DC converter, is reduced, and a voltage ripple becomes very small in value, it is possible to detect variation in a coil current of the DC-to-DC converter, thereby obtaining an add-up signal obtained by adding a variation component of the coil current to the output voltage. By comparing the add-up signal with the reference signal, variation in the coil current, due to a change in load, can be captured with reliability.
25 Citations
20 Claims
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1. A DC-to-DC converter control circuit comprising:
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an arithmetic circuit for outputting an add-up signal of an output voltage signal obtained according to an output voltage of a DC-to-DC converter, and an AC current signal obtained according to an AC current component of a coil current; and
a comparator for comparing the add-up signal with a reference signal, wherein switching control is executed according to a result of comparison by the comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A DC-to-DC converter control method comprising the steps of:
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adding an output voltage signal obtained according to an output voltage of a DC-to-DC converter to an AC current signal obtained according to an AC current component of a coil current;
comparing an addition result of the step of adding an output voltage signal with a reference signal; and
executing switching control according to a comparison result of the step of comparing the addition result. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification