Residual voltage controller and electric compressor including the same

Patent metadata

Field	Value
Publication number	US-12535072-B2
Application number	US-202218707772-A
Country	US
Kind code	B2
Filing date	Dec 19, 2022
Priority date	Feb 24, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A residual voltage controller and an electric compressor including the same, which aim to prevent an electric shock or an accident caused by detachment of a high voltage connector through safe interruption of a residual voltage using a plurality of switching elements. The residual voltage controller includes a high voltage connector having an interlock, an inverter part configured to receive power from the high voltage connector, a motor part electrically connected to the inverter part to be controlled, and voltage controllers connected between the high voltage connector and the inverter part in each different direction to interrupt a residual voltage of the motor part when detachment of the high voltage connector is performed before a normal stop signal.

First claim

The invention claimed is:

1 . A residual voltage controller, comprising:
a high voltage connector having an interlock; an inverter part configured to receive power from the high voltage connector; a motor part electrically connected to the inverter part to be controlled; and voltage controllers connected between the high voltage connector and the inverter part in each different direction to interrupt a residual voltage of the motor part when detachment of the high voltage connector is performed before a normal stop signal, wherein the voltage controllers comprise:
a first voltage controller connected in series between the high voltage connector and the inverter part; and
a second voltage controller connected in parallel between the high voltage connector and the inverter part,
wherein the first voltage controller comprises:
a first switching element configured to interrupt a residual voltage in a direction from the inverter part to the high voltage connector; and
a second switching element disposed in a direction opposite to the first switching element and electrically connected to the first switching element.

2 . The residual voltage controller of claim 1 , wherein the first voltage controller is configured to preferentially interrupt a voltage applied to the inverter part when detachment of the high voltage connector is performed.

3 . The residual voltage controller of claim 1 , wherein the second voltage controller is configured to reduce the residual voltage of the motor part through discharge.

4 . The residual voltage controller of claim 1 , wherein the first switching element comprises: a first ground switch provided for an electric connection, and wherein the second switching element comprises: a second ground switch provided for an electric connection.

5 . A residual voltage controller, comprising:
a high voltage connector having an interlock; an inverter part configured to receive power from the high voltage connector; a motor part electrically connected to the inverter part to be controlled; and voltage controllers connected between the high voltage connector and the inverter part in each different direction to interrupt a residual voltage of the motor part when detachment of the high voltage connector is performed before a normal stop signal, wherein the voltage controllers comprise:
a first voltage controller connected in series between the high voltage connector and the inverter part; and
a second voltage controller connected in parallel between the high voltage connector and the inverter part,
wherein the second voltage controller comprises:
a first switch configured to allow an electric coupling state to change over when detachment of the high voltage connector is performed;
a switching element electrically connected to the first switch; and
a resistance part electrically connected to the switching element, and configured to consume a voltage as heat generation is performed by an applied voltage when the first switch is changed over to an on-state.

6 . The residual voltage controller of claim 5 , wherein the switching element comprises: a ground switch provided for an electric connection.

7 . An electric compressor, comprising:
a housing; a motor part provided in the housing; a compression part configured to be driven by the motor part; an inverter part coupled to one side of the housing and configured to control operations of the motor part; a high voltage connector having an interlock; and voltage controllers connected between the high voltage connector and the inverter part in each different direction to interrupt a residual voltage of the motor part when detachment of the high voltage connector is performed before a normal stop signal, wherein the voltage controllers comprise:
a first voltage controller connected in series between the high voltage connector and the inverter part; and
a second voltage controller connected in parallel between the high voltage connector and the inverter part,
wherein the first voltage controller comprises:
a first switching element configured to interrupt a residual voltage in a direction from the inverter part to the high voltage connector; and
a second switching element disposed in a direction opposite to the first switching element and electrically connected to the first switching element.

8 . An electric compressor, comprising:
a housing; a motor part provided in the housing; a compression part configured to be driven by the motor part; an inverter part coupled to one side of the housing and configured to control operations of the motor part; a high voltage connector having an interlock; and voltage controllers connected between the high voltage connector and the inverter part in each different direction to interrupt a residual voltage of the motor part when detachment of the high voltage connector is performed before a normal stop signal, wherein the voltage controllers comprise:
a first voltage controller connected in series between the high voltage connector and the inverter part; and
a second voltage controller connected in parallel between the high voltage connector and the inverter part,
wherein the second voltage controller comprises:
a first switch configured to allow an electric coupling state to change over when detachment of the high voltage connector is performed;
a switching element electrically connected to the first switch; and
a resistance part electrically connected to the switching element, and configured to consume a voltage as heat generation is performed by an applied voltage when the first switch is changed over to an on-state.

Assignees

• Hanon Systems

Inventors

• Lee Ho Jin
• Kang Eun Seok

Classifications

• F04C2270/70

  Safety, emergency conditions or requirements · CPC title

• F04C2270/115

  Controlled or regulated · CPC title

• F04C2240/808

  Electronic circuits (e.g. inverters) installed inside the machine · CPC title

• F04C2240/803

  Electric connectors or cables; Fittings therefor · CPC title

• F04C28/28 Primary

  Safety arrangements; Monitoring · CPC title