DC-DC CONVERTER
First Claim
1. A DC-DC converter, comprising:
- a signal generator configured to generate a first signal having a prescribed level when an input power supply voltage is less than or equal to a prescribed voltage;
a first voltage controller configured to generate a first voltage to control an output voltage;
an error amplifier configured to output a second signal corresponding to a voltage difference between the first voltage and a voltage correlated to the output voltage when the first voltage is less than or equal to a reference voltage and to a voltage difference between the reference voltage and the voltage correlated to the output voltage when the first voltage is greater than the reference voltage;
a signal processor configured to generate, on the basis of the first signal and the second signal, a third signal and a switch control signal for controlling a first switch and a second switch connected in series between the input power supply voltage and a ground voltage; and
an output voltage controller configured to turn off the second switch during a start of the prescribed period of time.
1 Assignment
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Accused Products
Abstract
A DC-DC converter includes a signal generator that sets a first signal at a prescribed value when an input power supply voltage is at or lower than a prescribed voltage, a first voltage controller that generates a first voltage so that an output voltage rises gradually during a prescribed period of time, an error amplifier outputting a second signal corresponding to the voltage difference between the either the first voltage and a voltage correlated to the output voltage of the converter or a reference voltage and the voltage correlated to the output voltage, a signal processor that generates a third signal and a switch control signal for a high-side switch and a low-side switch on the basis of the first signal and the second signal, and an output voltage controller that causes the low-side switch to be turned off during a prescribed period from the start of the prescribed period.
26 Citations
20 Claims
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1. A DC-DC converter, comprising:
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a signal generator configured to generate a first signal having a prescribed level when an input power supply voltage is less than or equal to a prescribed voltage; a first voltage controller configured to generate a first voltage to control an output voltage; an error amplifier configured to output a second signal corresponding to a voltage difference between the first voltage and a voltage correlated to the output voltage when the first voltage is less than or equal to a reference voltage and to a voltage difference between the reference voltage and the voltage correlated to the output voltage when the first voltage is greater than the reference voltage; a signal processor configured to generate, on the basis of the first signal and the second signal, a third signal and a switch control signal for controlling a first switch and a second switch connected in series between the input power supply voltage and a ground voltage; and an output voltage controller configured to turn off the second switch during a start of the prescribed period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A DC-DC converter, comprising:
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a signal generator configured to generate a first signal having a prescribed level when an input power supply voltage is less than or equal to a prescribed voltage; a first voltage controller configured to generate a first voltage to control an output voltage; an error amplifier configured to output a second signal corresponding to a voltage difference between the first voltage and a voltage correlated to the output voltage when the first voltage is less than or equal to a reference voltage and a voltage difference between the reference voltage and the voltage correlated to the output voltage when the first voltage is greater than the reference voltage; a signal processor configured to generate a third signal and a switch control signal for controlling a first switch and a second switch connected in series between the input power supply voltage and a ground voltage; a first comparator configured to compare a voltage at a drain of the second switch to a ground voltage and to output a fourth signal to the signal processor that indicates whether the voltage of the drain of the second switch is at or below the ground voltage; and a second comparator configured to compare the first voltage to the reference voltage and to output a fifth signal to the signal processor that indicates whether the first voltage is at or below the reference voltage, wherein the signal processor generates the third signal on the basis of the first signal, and the switch control signal on the basis of the first signal, the second signal, the fourth signal, and the fifth signal. - View Dependent Claims (14, 15, 16)
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17. A method for controlling a DC-DC converter, comprising:
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receiving a first signal indicating whether an input power supply voltage is less than or equal to a prescribed voltage; receiving a second signal corresponding to (a) a voltage difference between a first voltage and a voltage correlated to an output voltage from a DC-DC converter when the first voltage is less than or equal to a reference voltage and (b) a voltage difference between the reference voltage and the voltage correlated to the output voltage when the first voltage is greater than the reference voltage; generating a third signal to indicate that the converter is in a standby state; and generating a switch control signal for controlling a first switch and a second switch connected in series between the input power supply voltage and a ground voltage, the switch control signal generated on the basis of the first signal and the second signal, wherein the switch control signal controls the first switch and the second switch. - View Dependent Claims (18, 19, 20)
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Specification