Testing device for testing an overcurrent protector, and method of operating the same. First and second switches are provided for connecting the first and second terminals of the overcurrent protector to first and second capacitors, respectively. The first and second capacitors are pre-charged to first and second voltages, where the second voltage is lower than the first. A controller switches the first and second switches to their test positions, which establishes a current path from the first capacitor to the second capacitor through the overcurrent protector. The first and second voltages are selected so that the peak current that would be generated in the current path is greater than the overcurrent threshold of the overcurrent protector.

A system and a method for an integrated test on a primary-secondary pole-mounted breaker. The method includes: establishing an electrical connection between the system and the primary-secondary pole-mounted breaker; establishing a communication connection between the system and the primary-secondary pole-mounted breaker; applying, by the system, a voltage signal and a current signal to the primary-secondary pole-mounted breaker through the electrical connection, to generate a voltage and a current on the primary-secondary pole-mounted breaker; collecting, by the system, signals of the voltage and the current fed back from the primary-secondary pole-mounted breaker through the communication connection; performing, by the system, an integrated accuracy test and an integrated protection test; outputting a test result of the accuracy test and a test result of the integrated protection test to the industrial control machine, to generate the test report. A blind zone in quality control of primary-secondary pole-mounted breakers is eliminated. Efficiency is improved in testing primary-secondary pole-mounted breakers.

An illustrative example embodiment of a switch monitoring device includes a controller configured to command a switch to enter at least one of a conducting state and a non-conducting state. A monitoring circuit conducts current when the switch is in the conducting state. A comparator provides an output indicating a relationship between a voltage of a selected portion of the monitoring circuit and a threshold voltage. The controller determines a condition of the switch based on the output of the comparator and the command.

A power system includes a battery and a controller. The controller inhibits charge of the battery according to voltage or current values sensed before and after contactors electrically connected to the battery are commanded to open and indicating that a leakage resistance associated with one of the contactors increases after the one of contactors is commanded to open, and a duration of a continuous voltage drop across another of the contactors after the another of the contactors is commanded to open exceeds a threshold.

An input device (10) is connectable to a switch (20) to receive a state of the switch (20) input as a voltage corresponding to the state. The input device (10) includes an output circuit (120) to output a first voltage or a second voltage different from the first voltage, an input circuit (150) to receive the voltage input from the output circuit (120) via the switch (20) in a closed state and output input signals (33) corresponding to the input voltage, a diagnoser (112) to determine whether the input signals change in response to switching of the voltage from the output circuit (120) to the second voltage, and a generator (113) to generate a state signal (34) indicating the state of the switch (20) based on the input signals (33). The second voltage differs from a reference voltage input to the input circuit (150) while the switch (20) is open.

Embodiments of this application relate to the technical field of electronics, and disclose an electrical control device detection circuit, a detection method, and an electric vehicle. In some embodiments of this application, the detection circuit is configured to detect a drive circuit of the electrical control device. The drive circuit includes a high-side switch unit. The detection circuit includes a first detection module and a control module. A first end of the first detection module is connected to a first end of the electrical control device. A second end of the first detection module is connected to a second end of the electrical control device. A third end of the first detection module is connected to the control module.

A detection circuit for open, close and suspension states of a high and low level effective switch in a vehicle. The circuit includes an optocoupler circuit module, a low-level active path module, a high-level active path module, a filtering and debouncing module, a transient suppression module, and a wiring terminal. The optocoupler circuit module is connected to the low-level active path module, the high-level active path module and the low-level active path module are connected in parallel to the filtering and debouncing module, and the filtering and debouncing module is connected to the transient suppression module, and then connected to the external high-level active switch or low-level active switch through the wiring terminal. Whether it is a high-level active switch or a low-level active switch, the detection circuit can distinguish whether the switch is in the closed or suspended state, and the strong and weak voltages are isolated.

A switch includes an operating member and three contacts (first, second and third contacts). The operating member displaces between a first and a second positions. A state of the three contacts is switched between a first and a second states by displacement of the operating member. Each contact connects or disconnects a signal line in the first state, and puts, in the second state, the signal line into a state reverse to the first stat. In course of the displacement of the operating member from the first position to the second position, the first contact switches from the first state to the second state, the second contact switches from the first state to the second state after switching of the first contact, and the third contact switches from the second state to the first state at a timing between switching of the first contact and switching of the second contact.

A sliding power contact and method includes a mobile load device connector and a socket. The mobile load device connector includes a non-current power pin having a first length, a current power pin having a second length less than the first length, a neutral pin, and a ground pin. The socket includes a non-current power contact configured to electrically couple with the non-current power pin, a current power contact configured to electrically couple with the current power pin, a neutral contact configured to electrically couple with the neutral pin, and a ground pin configured to electrically couple with the ground pin. An arc suppressor is directly coupled to at least one of the non-current power pin and the non-current power contact, wherein the arc suppressor, the non-current power pin and the non-current power contact form a current path between the current power pin and the current power contact.

An arc suppressing circuit configured to suppress arcing across a power contactor coupled to an alternating current (AC) power source having a predetermined number of phases, each contact of the power contactor corresponding to one of the predetermined number of phases includes a number of dual unidirectional arc suppressors equal to the predetermined number of phases of the AC power source. Each dual unidirectional arc suppressor includes a first phase-specific arc suppressor configured to suppress arcing across the associated contacts in a positive domain, a a second phase-specific arc suppressor configured to suppress arcing across the associated contacts in a negative domain, and a coil lock controller, configured to be coupled between a contact coil driver of the power contactor, configured to detect an output condition from the contact coil driver and inhibit operation of the first and second phase-specific arc suppressors over a predetermined time.