US 10,241,531 B1Granted

Power supply device

AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation

InventorTatsuhiko Maruyama

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Abstract

According to an embodiment of the present invention, a power supply device includes a switching circuit, a detection circuit, a first comparator, a current source circuit, and a delay circuit. The switching circuit performs switching control of a power supply voltage. The detection circuit detects an output voltage from the switching circuit. The first comparator compares the voltage detected by the detection circuit with a first reference voltage which is set in advance. The current source circuit outputs a bias current which has correlation with the power supply voltage. The delay circuit receives the bias current from the current source circuit, and outputs, to the switching circuit, a delay time which corresponds to an increase time of the output voltage, by using the bias current in accordance with the result of comparison performed by the first comparator.

Claims8

Dependent claims

A power supply device comprising:

a switching circuit to perform switching control of a power supply voltage;
a detection circuit to detect an output voltage from the switching circuit;
a first comparator to compare the voltage detected by the detection circuit with a first reference voltage which is set in advance;
a current source circuit to output a bias current which has correlation with the power supply voltage;
and
a delay circuit to receive the bias current from the current source circuit, and to output, to the switching circuit, a delay time which corresponds to an increase time of the output voltage, by using the bias current in accordance with a result of comparison performed by the first comparator, wherein the current source circuit includes
a voltage division circuit to divide the power supply voltage;
a current setting element to set the value of the bias current;
an operational amplifier to operate such that an output voltage from the voltage division circuit is equal to a voltage applied to both ends of the current setting element;
and
a current mirror circuit to output the bias current to the delay circuit in accordance with a result of an output from the operational amplifier.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/923,124Filed 16 Mar 2018
Priority: JP 2017-18533626 Sep 2017
Published: US 2019/0094896 A128 Mar 2019
Granted: 26 Mar 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G05F 1/595
Including plural semiconductor devices as final control devices for a single load: semiconductor devices connected in series
G05F 1/575
Using semiconductor devices in series with the load as final control devices: characterised by the feedback circuit
H03K 5/01
Manipulating of pulses not covered by one of the other main groups of this subclass: shaping pulses
H03K 5/24
Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal…