# US 10,504,674 B2 · DC adaptor for driving magnetic contactor

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- Number: US 10,504,674 B2
- Document ID: US10504674B2
- Status: Granted
- Kind: B2
- Application number: 16/354,469
- Filed: 2019-03-15
- Published: 2019-09-26
- Granted: 2019-12-10
- Earliest claimed: 2018-03-20
- Assignees: Yeon Hee Seo
- Applicants: Yeon Hee Seo
- Inventors: Sung Min Son
- Web page: https://patentgrep.com/patent/US10504674B2

## CPC

- H01H 47/22: for supplying energising current for relay coil
- H01H 47/223: {adapted to be supplied by AC}
- H01H 50/16: Magnetic circuit arrangements
- H01H 50/44: Magnetic coils or windings
- H01H 50/54: Contact arrangements
- H02M 7/062: {Avoiding or suppressing excessive transient voltages or currents}
- H01H 47/04: for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current {(with switching regulator H01H47/325)}
- H01H 47/32: Energising current supplied by semiconductor device
- H02M 1/0006: {Arrangements for supplying an adequate voltage to the control circuit of converters}
- H02M 7/06: using discharge tubes without control electrode or semiconductor devices without control electrode
- 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)
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

Disclosed is a DC adaptor for driving a magnetic contactor including at least: an AC input terminal; a capacitor connected to the AC input terminal; an electronic switch connected to the capacitor in parallel; a full-wave rectifier which converts an AC current into a DC current; a DC output connecting line which receives the DC current from the full-wave rectifier to transmit the DC current to the magnetic contactor; a sensing unit which measures a current value of a driving coil of the magnetic contactor; a controller which compares the measured current value with a reference value to output an on/off control signal of the electronic switch; a DC power source which generates a DC power using the DC current converted by the full-wave rectifier; and a housing which accommodates the above elements.

## Claims

### Claim 1

A DC adaptor for driving a magnetic contactor, comprising:
an AC input terminal;
a capacitor connected to the AC input terminal;
an electronic switch which is connected to the capacitor in parallel;
a full-wave rectifier which converts an AC current transmitted through the capacitor or the electronic switch into a DC current;
a DC output connecting line which receives the DC current from the full-wave rectifier to transmit the DC current to the magnetic contactor;
a sensing unit which measures a current value of a driving coil of the magnetic contactor;
a controller which compares the measured current value with a reference value to output an on/off control signal of the electronic switch;
a DC power source which generates a DC power required for an operation of the controller using the DC current converted by the full-wave rectifier; and
a housing which accommodates the capacitor, the electronic switch, the full-wave rectifier, the sensing unit, the controller, and the DC power source,
wherein the electronic switch is used at the time of starting the magnetic contactor and is controlled to be repeatedly on/off to maintain the driving current, the controller outputs an on control signal of the electronic switch when the measured current value is lower than a first reference value and outputs an off control signal of the electronic switch after elapse of a predetermined time, in order to start the magnetic contactor, and the controller outputs an on control signal of the electronic switch when the measured current value is lower than a second reference value and outputs an off control signal of the electronic switch when the measured current value is equal to or higher than the second reference value, in order to maintain the driving current.

### Claim 2 (depends on 1)

The DC adaptor for driving a magnetic contactor according to claim 1, wherein the predetermined time is 0.1 seconds to 0.2 seconds.

### Claim 3 (depends on 1)

The DC adaptor for driving a magnetic contactor according to claim 1, wherein the electronic switch is a photo TRIAC.