# US 2019/0172670 A1 · Detection circuit module for use in detecting an operational status of a household appliance door

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- Number: US 2019/0172670 A1
- Document ID: US20190172670A1
- Status: Published application
- Kind: A1
- Application number: 16/207,397
- Filed: 2018-12-03
- Published: 2019-06-06
- Earliest claimed: 2017-12-06
- Assignees: Defond Electech Co., Ltd.; Defond Components Limited
- Applicants: Defond Electech Co., Ltd.; Defond Components Limited
- Inventors: Chiu Keung LOONG
- Web page: https://patentgrep.com/patent/US20190172670A1

## CPC

- D06F 39/14: Doors or covers; Securing means therefor
- G01R 31/50: Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections (testing of sparking plugs H01T13/58)
- H01H 47/002: {Monitoring or fail-safe circuits}
- H01H 47/223: {adapted to be supplied by AC}
- D06F 34/08: Control circuits or arrangements thereof
- D06F 37/42: Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door
- D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

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 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 said diode being arranged electrically in parallel with the door locking switch.

## Claims

### Claim 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 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 said diode being arranged electrically in parallel with the door locking switch.

### Claim 2

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

### Claim 3 (depends on 2)

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

### Claim 4 (depends on 1)

A detection circuit module as claimed in claim 1 including a plurality of diodes arranged between the actuator and the second connecting 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.

### Claim 5 (depends on 1)

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 sequence of electrical pulse signals to detect the status of the door closing switch and the door locking switch.