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 generated by adding 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;
a comparator for comparing the add-up signal with a reference signal; and
a reference signal circuit for retaining a DC current component of a coil current signal as an another reference signal, on the basis of a detection signal obtained by adding the coil current signal according to the coil current containing the DC and AC current components to the output voltage signal,wherein the arithmetic circuit comprises an inverting amplifier for inverting a signal variation component of the output voltage signal, at the another reference signal, and adding the same to the output voltage signal, and an adder for adding the detection signal to an output signal from the inverting amplifier, and wherein switching control is executed according to a result of comparison by the comparator.
9 Assignments
0 Petitions
Accused Products
Abstract
In a DC-to-DC converter control circuit and control method thereof, an arithmetic circuit for outputs an add-up signal generated by adding an output voltage signal obtained by adding 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 compares the add-up signal with a reference signal. Switching control is executed according to a result of the comparison by the comparator. By the control circuit and method, variations in the coil current due to a change in load may be reliably captured by comparing the add-up signal with the reference signal, and compatibility between low ripple voltage characteristics and stable and fast response to sudden changes in load may be achieved.
10 Citations
18 Claims
-
1. A DC-to-DC converter control circuit comprising:
-
an arithmetic circuit for outputting an add-up signal generated by adding 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; a comparator for comparing the add-up signal with a reference signal; and a reference signal circuit for retaining a DC current component of a coil current signal as an another reference signal, on the basis of a detection signal obtained by adding the coil current signal according to the coil current containing the DC and AC current components to the output voltage signal, wherein the arithmetic circuit comprises an inverting amplifier for inverting a signal variation component of the output voltage signal, at the another reference signal, and adding the same to the output voltage signal, and an adder for adding the detection signal to an output signal from the inverting amplifier, and 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. A DC-to-DC converter control method comprising:
-
adding 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; retaining an another reference signal of the AC current signal, on the basis of a detection signal obtained by adding the coil current signal according to the coil current containing the DC and AC current components to the output voltage signal; comparing an addition result of the step of adding the output voltage signal with a reference signal; and executing switching control according to a comparison result of the step of comparing the addition result, wherein the addition comprises; inverting a signal variation component of the another reference signal according to the output voltage signal; adding the signal variation component to the output voltage signal; and
adding the detection signal to a signal obtained by the adding the signal variation component. - View Dependent Claims (15, 16, 17, 18)
-
Specification