US 12,531,515 B2Granted

Driver device for class-d full bridge amplifier

AssigneeKyosan Electric Mfg. Co., Ltd.

InventorsItsuo Yuzurihara, Satoshi Aikawa, Tadaharu Ohno

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Abstract

The present invention suppresses unevenness of an input/output current of a full bridge circuit, which is caused due to a cross current generated by a delay operation or the like of a switching element and unevenness of a driver voltage of each switching element, and suppresses an occurrence of an erroneous operation of an amplifier of a class-D full bridge circuit. A driver device of a class-D full bridge amplifier according to the present invention sets, at the same potential in terms of DC, reference potentials on a low-voltage side of two high-side driver circuits which drive two high-side switching elements which constitute a full bridge circuit, and suppresses an occurrence of unevenness of a driver voltage of the switching elements due to a cross current which flows between the bridge circuit and the high-side driver circuits. In the configuration in which a plurality of class-D full bridge amplifiers are driven, a driver power supply is individually provided to driver circuits which drive the class-D full bridge amplifiers, and cross currents which flow between the plurality of class-D full bridge amplifiers are suppressed.

Claims5

Dependent claims

A driver device of a class-D full bridge amplifier that includes a full bridge circuit consisting of four switching elements of two high-side switching elements and two low-side switching elements to drive switching elements in the class-D full bridge amplifier for performing power conversion on a DC voltage of a DC power supply, comprising:

(A) a driver circuit that drives the switching element;
and
(B) a driver power supply that applies a voltage to the driver circuit, wherein the driver circuit comprises:
(A1) two high-side driver circuits that drive the two high-side switching elements;
and
(A2) two low-side driver circuits that drive the two low-side switching elements, and the driver power supply comprises:
(B1) a high-side driver power supply that applies driver voltages to the two high-side driver circuits;
and
(B2) a low-side driver power supply that applies driver voltages to the two low-side driver circuits,
in the two high-side driver circuits
(a) high voltage parts being connected to a high voltage part of the high-side driver power supply,
(b) low voltage parts being connected to a low voltage part of the high-side driver power supply,
(c) potentials on the low voltage parts being equipotential in terms of direct current with respect to a reference potential which is isolated from a ground potential,
(d) a potential at a midpoint in one series circuit formed by the high-side switching element and the low-side switching element and a potential at a midpoint in the other series circuit formed by the other high-side switching element and the other low-side switching element being equipotential in the full bridge circuit.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/915,149Filed 17 Mar 2021
Priority: JP 2020-06434431 Mar 2020
Published: US 2023/0112281 A113 Apr 2023
Granted: 20 Jan 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H02M 1/08
Details of apparatus for conversion: circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in…
H03F 1/0211
In transistor amplifiers: with control of the supply voltage or current
H02M 3/33573
Having several active switching elements: full-bridge at primary side of an isolation transformer
H03F 3/217
With semiconductor devices only: class D power amplifiers; Switching amplifiers