Embodiments of the present disclosure relate to a control device and method for a contactor. The control device comprises a first high-side control unit, a second high-side control unit, a first low-side control unit and a second low-side control unit. The first high-side control unit and the second high-side control unit respectively connect a first magnetic unit and a second magnetic unit of the contactor to a power supply. The first low-side control unit is connected between the first magnetic unit and a reference voltage node, and the second low-side control unit is connected between the second magnetic unit and the reference voltage node. The control device further comprises a freewheel unit connected to the first magnetic unit and the second magnetic unit. The control device further comprises a controller. The controller is used to control operations of the control units so that in a state that at least one magnetic unit of the first magnetic unit and the second magnetic unit is disconnected from the power supply, a current of the at least one magnetic unit flows through the freewheel unit. According to embodiments of the present disclosure, the contactor may be made more energy-saving, and the operation cost may be reduced.

Embodiments of the present disclosure relate to a control device and method for a contactor. The control device comprises a first high-side control unit, a second high-side control unit, a first low-side control unit and a second low-side control unit. The first high-side control unit and the second high-side control unit respectively connect a first magnetic unit and a second magnetic unit of the contactor to a power supply. The first low-side control unit is connected between the first magnetic unit and a reference voltage node, and the second low-side control unit is connected between the second magnetic unit and the reference voltage node. The control device further comprises a freewheel unit connected to the first magnetic unit and the second magnetic unit. The control device further comprises a controller. The controller is used to control operations of the control units so that in a state that at least one magnetic unit of the first magnetic unit and the second magnetic unit is disconnected from the power supply, a current of the at least one magnetic unit flows through the freewheel unit. According to embodiments of the present disclosure, the contactor may be made more energy-saving, and the operation cost may be reduced.

The present disclosure relates to contactor, and device and method for controlling same. A control device for a contactor comprises a high side control unit, a first low side control unit, a second low side control unit, a freewheeling unit, and a controller. The high side control unit is configured to switch on or switch off the connection of the first magnetic unit and the second magnetic unit of the contactor with a power supply. The first low side control unit is configured to switch on or switch off the connection of the first magnetic unit with the reference voltage node. The second low side control unit is configured to switch on or switch off the connection of the second magnetic unit with the reference voltage node. The freewheeling unit is connected across a branch comprising a first magnetic unit and a first low side control unit and connected across a branch comprising a second magnetic unit and a second low side control unit. The controller is configured to control the operation of the high side control unit, the first low side control unit, and the second low side control unit. Embodiments of the present disclosure may enable intelligent control of contactors with simple control logic.

A system includes a contactor operatively connected to a coil for actuating the contactor to open and close a circuit. A pass element includes a source, a drain, and a gate, wherein the drain is electrically connected to the coil, and wherein the coil is in series between the pass element and ground. A voltage source is connected to the source of the pass element to pass current into the coil when the pass element is in a pass state. A current source control circuit with economizer is operatively connected to the gate of the pass element. A delay circuit is operatively connected to the current source control circuit with economizer and to a command line to command a lower current for holding the contactor closed after a delay has expired for the contactor to transition.

A system includes a contactor operatively connected to a coil for actuating the contactor to open and close a circuit. A pass element includes a source, a drain, and a gate, wherein the drain is electrically connected to the coil, and wherein the coil is in series between the pass element and ground. A voltage source is connected to the source of the pass element to pass current into the coil when the pass element is in a pass state. A current source control circuit with economizer is operatively connected to the gate of the pass element. A delay circuit is operatively connected to the current source control circuit with economizer and to a command line to command a lower current for holding the contactor closed after a delay has expired for the contactor to transition.

A relay control circuit configured to control opening and closing of a contact of a non-latch relay, the non-latch relay including the contact and a coil configured to operate the contact, the relay control circuit comprises a high-voltage power supply; a low-voltage power supply; a power supply switching circuit; a first capacitor; and a reference voltage node, wherein the power supply switching circuit and one end of the first capacitor are connected to one end of the coil, the other end of the first capacitor and the reference voltage node are connected to the other end of the coil, and the power supply switching circuit is configured to switch a power supply connected to the one end. of the coil between the high-voltage power supply and the low-voltage power supply.

A relay control circuit configured to control opening and closing of a contact of a non-latch relay, the non-latch relay including the contact and a coil configured to operate the contact, the relay control circuit comprises a high-voltage power supply; a low-voltage power supply; a power supply switching circuit; a first capacitor; and a reference voltage node, wherein the power supply switching circuit and one end of the first capacitor are connected to one end of the coil, the other end of the first capacitor and the reference voltage node are connected to the other end of the coil, and the power supply switching circuit is configured to switch a power supply connected to the one end. of the coil between the high-voltage power supply and the low-voltage power supply.

A relay control circuit is configured to control opening and closing of a contact of a non-latch relay that includes the contact and a coil configured to operate the contact. The relay control circuit includes: a low-voltage power supply; a high-voltage power supply; a first transistor; a rectifying element; and a reference voltage node. A high-voltage terminal of the first transistor is connected to a positive electrode of the high-voltage power supply. A low-voltage terminal of the first transistor is connected to one end of the coil. An anode of the rectifying element is connected to a positive electrode of the low-voltage power supply. A cathode of the rectifying element is connected to one end of the coil. A negative electrode of the high-voltage power supply, a negative electrode of the low-voltage power supply, and the other end of the coil are connected to the reference voltage node.

A relay control circuit is configured to control opening and closing of a contact of a non-latch relay that includes the contact and a coil configured to operate the contact. The relay control circuit includes: a low-voltage power supply; a high-voltage power supply; a first transistor; a rectifying element; and a reference voltage node. A high-voltage terminal of the first transistor is connected to a positive electrode of the high-voltage power supply. A low-voltage terminal of the first transistor is connected to one end of the coil. An anode of the rectifying element is connected to a positive electrode of the low-voltage power supply. A cathode of the rectifying element is connected to one end of the coil. A negative electrode of the high-voltage power supply, a negative electrode of the low-voltage power supply, and the other end of the coil are connected to the reference voltage node.

A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.