Embodiments of the present disclosure provide an electrical device, a method for controlling a solid state circuit breaker electrical device, and a computer-readable storage medium. The method comprises: in a closed state of a mechanical switch of the electrical device, closing one of a plurality of electronic switches of the electrical device within a predetermined time period before a zero-crossing point of an input voltage of a bus circuit to which the electrical device is connected; acquiring a current value or a voltage value of a sampling resistor in the electrical device within the predetermined time period; and in response to determining that the current value or the voltage value as acquired is less than or equal to a predetermined threshold, causing an indication component to indicate that there is no short circuit fault in the bus circuit. In this way, it is possible to effectively avoid repeated closing of electronic switches of the electrical device such as a solid state circuit breaker, thereby significantly extending the service life of electronic switches of the electrical device and thereby improving the service life and user experience of the electrical device.

An apparatus and method for diagnosing damage of a switch in a battery protection circuit include a battery protection circuit including a first switch and a second switch connected to a battery pack and a switch damage diagnosing device for measuring in the battery protection circuit and for diagnosing whether any one of the first switch and the second switch is damaged. The source terminal of the first switch and the source terminal of the second switch can be connected to a common source, which can diagnose whether or not the switch is damaged only by measuring the voltage at a certain point without measuring a current.

A method (100) for determining potentials (V.sub.i) across the terminals of the N phases of a motor, N being an integer greater than or equal to 4, comprising: determining (102) reference potentials (V.sub.REF_i) across the terminals of the N phases for a defined drive voltage V.sub.MAG (101) of phase , with i between 1 and N and

[00001]$V_{\mathrm{REF}\_i}=V_{\mathrm{MAG}}\cos \left(-\frac{2}{N}\left(i-1\right)\right)$ comparing (103) the reference potentials to a first threshold (seuil 1); if the reference potentials are all less than or equal to the first threshold (104), then the potentials across the terminals of the N phases are equal to the reference potentials, or if at least one of the reference potentials is greater than the first threshold, comparing (105) these potentials to a second threshold (seuil 2) greater than the first threshold; if these reference potentials are all less than or equal to the second threshold (106), then the potentials across the terminals of the N phases are V.sub.i=V.sub.REF_i+V.sub.H, with

[00002]$V_H=\frac{\underset{k=1.Math.N}{\max }\left(V_{{\mathrm{REF}}_k}\right)+\underset{k=1.Math.N}{\min }\left(V_{{\mathrm{REF}}_k}\right)}{2}$ or if at least one of the potentials is greater than the second threshold (107), then the potentials across the terminals of the N phases are V.sub.i=V.sub.REF_i+V.sub.S_i+V.sub.HN, with V.sub.HN and V.sub.S_i dependent on N and on the reference potentials.

A shunt resistor device includes: a plate-shaped resistor, a first electrode and a second electrode connected to respective ends of the resistor respectively in the first direction along the plate surface of the resistor; and a substrate having pairs of voltage detection points provided on the first and second electrode sides, and stacked on the resistor and each electrode. Each of the space between the resistor and each electrode, and the space between each electrode and the substrate, is joined by a conductive joint along a second direction orthogonal to the first direction. A monitoring device measures a terminal voltage between the first and second electrode sides of the resistor based on detection voltage between the pair of voltage detection points, and a fault detection unit of the monitoring device determines whether a joint abnormality of conductive joint occurs based on detection voltages of the first and second detection points.

Circuitry for measuring a characteristic of an electrochemical cell, the circuitry comprising: a comparator having a first comparator input, a second comparator input and a comparator output; a feedback path between the comparator output and the second comparator input configured to provide a feedback signal to the second comparator input; and a loop filter configured to apply filtering to the feedback path to generate the feedback signal, wherein the loop filter comprises the electrochemical cell.

A source measure device includes a current sampling circuit, a voltage sampling circuit, an overvoltage detecting circuit, and a comparing circuit. The current sampling circuit is configured to sample a current of a device under test. The voltage sampling circuit is configured to sample a voltage of the device under test. The overvoltage detecting circuit is coupled to the current sampling circuit and the voltage sampling circuit, and receives a first operation voltage of the current sampling circuit and a second operation voltage of the voltage sampling circuit so as to generate a detection voltage. The comparing circuit is coupled to the overvoltage detecting circuit, and determines whether the detection voltage is within a voltage range. If the detection voltage is not within the voltage range, the comparing circuit generates an abnormal signal.