A semiconductor device includes: a first input to which an input signal is input; a second input to which a reference signal is input; and a comparison stage which includes a current source connected to a first potential and first and second current path parts connected between the current source and a second potential different from the first potential and performing a comparison operation in response to the input signal and the reference signal, wherein the first and second current path parts respectively include first and second input circuits which are connected to the current source and first and second load circuits which are connected between the second potential and the first and second input circuits, wherein the first input circuit includes a first signal transistor and a first reference transistor, and wherein the second input circuit includes a second signal transistor and a second reference transistor.

An electronic device is provided. The electronic device includes a housing, a first printed circuit board disposed inside the housing and including a first antenna, a first connector connected to the first antenna, a second antenna, and a second connector connected to the second antenna, memory storing one or more computer programs, a second printed circuit board spaced apart from the first printed circuit board inside the housing and including a power management circuit, a third connector electrically connected to the first connector, a fourth connector electrically connected to the second connector, a first detection circuit, and one or more processors communicatively coupled to the first detection circuit and the memory, a first cable electrically connecting the first connector and the third connector, and a second cable electrically connecting the second connector and the fourth connector, wherein the first detection circuit includes a first resistor disposed between the one or more processors and the power management circuit, and the first printed circuit board includes a second resistor branched between the first antenna and the first connector and electrically connected to the ground, and a third resistor branched between the second antenna and the second connector and electrically connected to the ground.

An electrical storage system includes an electrical storage device, a load, a line, a relay, a capacitor, a voltage sensor, a first insulation resistor, a second insulation resistor, a first current path, a second current path, and a controller. The capacitor has one end connected to the electrical storage device and the other end connected to a ground. The voltage sensor is configured to detect a voltage value of the capacitor. The first insulation resistor is provided between the electrical storage device and the ground. The second insulation resistor is disposed between the load and the ground. The first current path includes the first insulation resistor. The second current path includes the line and the second insulation resistor. The controller is configured to control ON and OFF of the relay.

A smart-home device may include a solid state relay (SSR) switching integrated circuit (IC). SSR switching IC may include switching elements configured to open and close a connection between a power wire and a return wire of an environmental system; a voltage sensor that measures a voltage across the one or more switching elements; a current sensor that measures a current through the one or more switching elements; and a temperature sensor that measures a temperature near the one or more switching elements. The smart-home device may also include a wireless communication device that periodically receives voltage, current, and temperature data originating from the SSR switching IC and transmits the voltage, current, and temperature data to a device management server. The device management server may receive batches of voltage, current, and temperature data from a plurality of smart-home devices.

In order to suppress both large current and arc discharge during hot switching, a grounding circuit includes a first relay, a second relay, and a third relay, a first resistance connected in series with the first relay and is capable of connecting the feeding path to the ground, and a voltage divider connected in series with the second relay and the third relay and is connectable in such a way as to divide voltage between the feeding path and the ground, the third relay being disposed at a point at which the voltage is divided, and when the feeding path is to be connected to the ground, the feeding path is connected to the ground via the first resistance by the first relay, the voltage divider is connected in parallel with the first relay and the first resistance, and a connection to the ground is cut off.

An indicating circuit for a switching power supply is provided. An LED and a resistor are connected in series, and then are connected in parallel with a capacitor, and the parallel-connected circuit and a diode are connected in series in the same direction, and then are connected in parallel with an inductor to form the indicating circuit. The cathode of the indicating circuit is a terminal 1, and the anode of the indicating circuit is a terminal 2. A charging loop between a rectifying bridge and an electrolytic capacitor for filtering in a fly-back switching power supply is broken to insert the indicating circuit; when the electrolytic capacitor for filtering is normal, an excitation current of a main power stage basically does not appear in the inductor, and the LED does not emit light; when the ESR of the electrolytic capacitor rises greatly, the excitation current of the main power stage appears in the inductor; furthermore, when a switching transistor in the switching power supply is switched off, the excitation current flowing through the inductor may not be changed abruptly, and is freewheeled by the diode; after being filtered by the capacitor, the excitation current drives the LED to emit light; the LED may be a light emitter of a photocoupler to notify a user that: the ESR of the filter capacitor has risen and the switching power supply has a risk of failure, thereby avoiding aggravation of loss; and the indicating circuit has the characteristics of low cost and easiness in implementation.

A power tool includes a housing and an electrical power source. A control circuit is electrically connected to the electrical power source and configured to control at least one operation of the power tool. A power tool condition indication circuit is electrically connected to the control circuit comprising a zener diode configured to be conductive at a threshold voltage. The power tool condition indication circuit is configured generate a first indication signal when a voltage controlled by the control circuit exceeds the threshold voltage and generate a second indication signal when a voltage controlled by the control circuit is below the threshold voltage.

A system for monitoring impedance of an electrical connection device includes a first connection port, a second connection port, a first impedance element, an analog-to-digital converter (ADC), clamping circuitry, and processing subsystem. The first connection port is configured to be electrically coupled to a first side of the electrical connection device, and the second connection port is configured to be electrically coupled to a second side of the electrical connection device. The ADC includes a first input port and a second input port. The first input port is electrically coupled to the first connection port, and the second input port is electrically coupled to the second connection port via the first impedance element. The clamping circuitry is electrically coupled to at least one of the first input port and the second input port. The processing subsystem is configured to determine impedance of the electrical connection device.

Disclosed are a method and device for detecting system failure, a computer device, and a storage medium. The method includes obtaining, when a system to be detected is powered on or off, a real-time voltage oscillation signal acquired by a voltage sensor arranged in a detection circuits of the system. The detection circuit is a circuit where a source and drain of a switching device in the system are located. A degradation trend of the system is determined according to the real-time voltage oscillation signal and a reference voltage oscillation signal corresponding to the detection circuit of the system. A failure detection for the system is performed according to the degradation trend of the system.

Disclosed are a method and device for detecting system failure, a computer device, and a storage medium. The method includes obtaining, when a system to be detected is powered on or off, a real-time voltage oscillation signal acquired by a voltage sensor arranged in a detection circuits of the system. The detection circuit is a circuit where a source and drain of a switching device in the system are located. A degradation trend of the system is determined according to the real-time voltage oscillation signal and a reference voltage oscillation signal corresponding to the detection circuit of the system. A failure detection for the system is performed according to the degradation trend of the system.