Embodiments of this application relate to the field of electricity, and disclose a drive circuit. In some embodiments of this application, the drive circuit includes a low-side driver module and a delay module, the delay module is configured to output a delay signal of preset duration to the low-side driver module in a case that a control module is being reset; and the low-side driver module is configured to: according to on the delay signal of preset duration, maintain a first state within the preset duration, the first state being the same as a second state; where the second state is a working state of the low-side driver module before the control module is reset, and the second state includes being on or off. The embodiments can help avoid safety hazards caused by unexpected disconnection of a drive signal of the control module.

The present invention relates to a coil actuator (1) for low and medium voltage applications, which comprises a electromagnet (2) operatively associated with a movable plunger (8), a power & control unit (3) electrically connected with said electromagnet (2) and first and second input terminals (T1, T2) operatively connected with said power & control unit, wherein an input voltage (VIN) is applied between said first and input terminals during the operation of said coil actuator.

The said power & control unit is adapted to provide subsequent launch pulses of drive current (IC) to said electromagnet (2), which are separated in time by at least a predetermined time interval (TI), in response to subsequent transitions of said input voltage (VIN) from values lower than said first threshold voltage (VTH1) to values higher than said first threshold voltage.

The present application relates to a coil actuator for low and medium voltage applications, which comprises a electromagnet operatively associated with a movable plunger, a power & control unit electrically connected with the electromagnet and first and second input terminals (T1, T2) operatively connected with the power & control unit, wherein an input voltage (VIN) is applied between said first and second input terminals during the operation of the coil actuator. The coil actuator further comprise a third input terminal (T3) operatively connected with the power & control unit, the third input, terminal being adapted to be in a first operating connection (A), which correspondences to normal control conditions (NDC) for the operation of the electromagnet, or in a second operating condition (B), which corresponds to overriding control conditions (ODC) for the operation of said electromagnet. The power & control unit is adapted to control the operation of the electromagnet according to the normal control conditions or the overriding control conditions depending on the operating condition (A, B) of the third input terminal.

A method for controlling an electromagnetic actuator including: applying a first control strategy in which first and third switches are kept in a closed state, whereas a second switch is switched between its open and closed states; detecting an occurrence of overconsumption of current in a coil of the actuator, by detecting that voltage measured on a control bus has exceeded a predefined voltage limit or by detecting that a duty cycle of the second switch has dropped below a threshold value; and in response, applying a second control strategy, instead of the first control strategy, in which the third switch is periodically opened in order to decrease the current supplied to the coil.

A battery control apparatus includes: an MCU including a first control terminal, a first sensing terminal connected to a first node, a second control terminal, a third control terminal, a second sensing terminal connected to a second node, and a fourth control terminal; a relay including a switch and a coil connected between the first node and the second node; and a first reduction circuit including a first transistor having a first gate connected to the first control terminal and a first end connected to the first node, and a second transistor having a second gate connected to the second control terminal and the MCU controls the first gate and the second gate to respectively allow the first transistor to be turned on and the second transistor to be turned off when there is no voltage change of the first node.

Provided is an electromagnetic switch control device capable of stabilizing a contact pressure by predicting a near-future value of an operation coil current and performing control such that the near-future value does not fall below a holding current threshold value by a control unit. An electromagnetic switch control device 1 opens and closes 13 by an electromagnetic force corresponding to energization of operation coils 16 and 17, and includes PWM control units 21 to 23 that perform PWM pulse width modulation control of a current value A flowing through the operation coils 16 and 17. The PWM control units to 23 estimate the near-future predicted current value flowing through the operation coils 16 and 17 by using a terminal voltage V of the operation coils 16 and 17, and perform PWM control based on the estimated current value. The predicted current value Y is estimated by using an impedance Z of the operation coils 16 and 17. The impedance is a variable obtained by current values A1 and A2 and terminal voltages V1 and V2 of the operation coils 16 and 17, and a constant approximated over a predetermined period from a latest past to a present time is used. The impedance is updated for each predetermined period.

An embodiment circuit comprises high-side and low-side switches arranged between supply and reference nodes, and having an intermediate node. A switching control signal is applied with opposite polarities to the high-side and low-side switches. An inductive load is coupled between the intermediate node and one of the supply and reference nodes. Current sensing circuitry is configured to sample a first value of the load current flowing in one of the high-side and low-side switches before a commutation of the switching control signal, sample a second value of the load current flowing in the other of the high-side and low-side switches after the commutation of the switching control signal, sample a third value of the load current flowing in the other of the high-side and low-side switches after the second sampling, and generate a failure signal as a function of the first, second and third sampled values of the load current.

A relay device includes a coil portion, a fixed contact, a spring, a moving contact and a drive circuit. The drive circuit controls the electromagnetic force of the coil portion to be a first electromagnetic force when switching the fixed contact and the moving contact in a contact state to a non-contact state. The drive circuit controls the electromagnetic force of the coil portion to be a second electromagnetic force that is larger than the first electromagnetic force after a lapse of a first time from start of control of the electromagnetic force of the coil portion to be the first electromagnetic force. The drive circuit controls the electromagnetic force of the coil portion to be reduced with time after a lapse of a second time from start of control of the electromagnetic force of the coil portion to be the second electromagnetic force.

Disclosed is a method for closing the contacts of an electrical switching device during a switch-on process, wherein for a fixed first time period, the first time period and the first voltage being selected in such a way that the armature is not set into motion during the first time period, or the first voltage is applied to the coil until a certain current value is reached, the first time period being the time period until said certain current value is reached, and the first voltage being selected in such a way that the armature is not set into motion during the first time period, wherein a suitable second voltage is defined, the second voltage being greater than the first voltage and being applied to the coil during a second time period in order to move the armature from the open position into the closed position.

A power electronics assembly of a domestic appliance includes a first relay controlling an electrical contact between a first current-carrying conductor and an electric consumer. The assembly further includes a semiconductor switching element that switches the electrical contact between the first current-carrying conductor and the electric consumer and is arranged in parallel with the first relay. A controller is programmed to activate the semiconductor switching element to switch on the electrical consumer before the first relay is closed.