Detection circuit module for use in detecting an operational status of a household appliance door

Patent metadata

Field	Value
Publication number	US-10964499-B2
Application number	US-201816207397-A
Country	US
Kind code	B2
Filing date	Dec 3, 2018
Priority date	Dec 6, 2017
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A detection circuit module for use with a household appliance door to detect when the door is closed and/or locked, the detection circuit module having a first and a second contact configured for electrical connection with the household appliance door so as to be operable with the household appliance door, the detection circuit module including: a door closing switch arranged electrically in series between the first connecting contact and an actuator; a door locking switch arranged electrically in series between the actuator member and the second connecting contact; and a diode arranged in series with the actuator and the second connecting contact and the diode being arranged electrically in parallel with the door locking switch.

First claim

What is claimed is:

1. A detection circuit module for use with a household appliance door to detect when the door is closed and/or locked, said detection circuit module having a first and a second contact configured for electrical connection with the household appliance door so as to be operable with the household appliance door, the detection circuit module including:
a door closing switch arranged electrically in series between the first contact and an actuator;
a door locking switch arranged electrically in series between the actuator and the second contact; and
a diode arranged in series with the actuator and the second contact and said diode being arranged electrically in parallel with the door locking switch; and
wherein said detection circuit module is configured for being driven by an AC power supply and said diode is configurable for arrangement electrically in different directions within the detection circuit module in order to detect when the door is closed and/or locked.

2. A detection circuit module as claimed in 1 wherein, said actuator includes an electro-mechanical actuator.

3. A detection circuit module as claimed in claim 2 wherein the electro-mechanical actuator includes a solenoid actuator.

4. A detection circuit module as claimed in claim 1 including a plurality of diodes arranged between the actuator and the second contact, said plurality of diodes being arranged electrically in series with each other and said plurality of diodes being arranged in parallel with the door locking switch.

5. A detection circuit module as claimed in claim 1 including a controller circuit module configured for outputting a sequence of electrical pulse signals via an output signal pin, said detection circuit module being operable by reference to the sequence of electrical pulse signals to detect the status of the door closing switch and the door locking switch.

Assignees

• Defond Electech Co Ltd
• Defond Components Ltd

Inventors

• Loong Chiu Keung

Classifications

• D06F34/08

  Control circuits or arrangements thereof · CPC title

• D06F39/14 Primary

  Doors or covers; Securing means therefor · CPC title

• D06F37/42

  Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door · CPC title

• H01H47/223

  adapted to be supplied by AC · CPC title

• H01H47/002 Primary

  Monitoring or fail-safe circuits · CPC title