US 2026/0291389 A1Published application

On-board charger and operating method thereof

AssigneeDelta Electronics, Inc.

InventorsYu-Lung TSAI, Chi-I LIU, Cheng-Hao HSUEH

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Abstract

An on-board charger is configured in an electric vehicle equipped with an on-board battery. The on-board charger includes an AC-to-DC conversion circuit, an energy storage capacitor, a bidirectional conversion circuit, an AC conversion circuit, and a controller. The AC-to-DC conversion circuit converts a first AC power source into a DC power source. The bidirectional conversion circuit bidirectionally converts the DC power source and an energy storage power source, and charges or discharges the on-board battery according to the energy storage power source. The AC conversion circuit selectively provides a second AC power source according to either the first AC power source or the DC power source, and the controller continuously controls the AC conversion circuit to provide the second AC power source to a load according to residual power of the on-board charger during a hold-up time after a power interruption of the first AC power source.

Claims19

Dependent claims

An on-board charger configured in an electric vehicle comprising an on-board battery, the on-board charger comprising:

an AC-to-DC conversion circuit coupled to an external connection port for transmitting a first AC power source, and the AC-to-DC conversion circuit configured to convert the first AC power source into a DC power source,
an energy storage capacitor coupled to the AC-to-DC conversion circuit, and configured to store the DC power source,
a bidirectional conversion circuit coupled to the AC-to-DC conversion circuit and the on-board battery, and configured to bidirectionally convert the DC power source and an energy storage power source to charge or discharge the on-board battery according to the energy storage power source,
an AC conversion circuit coupled to the AC-to-DC conversion circuit and a power supply port, and the AC conversion circuit configured to selectively provide a second AC power source according to the first AC power source or the DC power source, and
a controller coupled to the AC conversion circuit, and configured to continuously control the AC conversion circuit to provide the second AC power source according to residual power of the on-board charger for a hold-up time after a power interruption of the first AC power source so as to continuously supply power to a load through the power supply port.

2 more elements

An operating method of an on-board charger, the on-board charger configured in an electric vehicle comprising an on-board battery, the on-board charger comprising an AC-to-DC conversion circuit, an energy storage capacitor, a bidirectional conversion circuit, and an AC conversion circuit, the AC-to-DC conversion circuit coupled to an external connection port for transmitting a first AC power source, and the AC-to-DC conversion circuit coupled to a power supply port for connecting a load, the method comprising steps of:

(a) operating in a charging mode for charging the on-board battery, the charging mode comprising steps of:
(a1) controlling the AC-to-DC conversion circuit to convert the first AC power source into a DC power source and storing the DC power source in the energy storage capacitor,
(a2) controlling the bidirectional conversion circuit to convert the DC power source into an energy storage power source and providing the energy storage power source to charge the on-board battery, and
(a3) controlling the AC conversion circuit to selectively provide a second AC power source according to either the first AC power source or the DC power source to supply power to the load,
(b) detecting that the first AC power source has been interrupted, and
(c) continuously controlling the AC conversion circuit to provide the second AC power source according to residual power of the on-board charger for a hold-up time after the power interruption of the first AC power source so as to continuously supply power to the load through the power supply port.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/536,564Filed 11 Feb 2026
Priority: CN 202511969908.824 Dec 2025
Published: 24 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

B60L 53/22
Characterised by converters located in the vehicle: constructional details or arrangements of charging converters specially adapted for charging…
H02M 3/158
With automatic control of output voltage or current, e.g. switching regulators: including plural semiconductor devices as final control devices…
B60L 3/0046
Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train: relating to electric energy…
B60L 50/60
Using propulsion power supplied by batteries or fuel cells: using power supplied by batteries