A bridge circuit including first and second switch elements connected in tandem at a first connection point, and third and fourth switch elements connected in tandem at a second connection point, and a control unit which when a mode signal indicates a first mode, controls the first to fourth switch elements so that the first and fourth switch elements and the second and third switch elements are alternately turned on and off, and when the mode signal indicates a second mode, controls the third switch element to be off state and the fourth switch element to be on state, and applies analog output control to vertically change a current made to flow due to an analog voltage in which a voltage greater than or equal to a gate threshold voltage changes up and down, to the first switch element during charge control and the second switch element in charging.

A display panel is provided. The display panel includes a cell test structure. The cell test structure is positioned at a frame of the display panel. The cell test structure includes cell test portions for supplying electric power to the cell test structure, and multiple connection lines for connecting conductive lines of a display region of the display panel. The cell test structure also includes a first shorting bar disposed and connected between the cell test portions and the connection lines. The cell test structure further includes multiple active switches disposed on the connection lines. The active switches are electrically connected to the cell test portions.

An insulation resistance measuring device including a positive electrode test resistor connected to a positive electrode node of a battery assembly, a negative electrode test resistor connected to a negative electrode node of the battery assembly, a first switch connecting the positive electrode node of the battery assembly to the positive electrode test resistor, a second switch connecting the negative electrode node of the battery assembly to the negative electrode test resistor, a voltage measurement unit that measures a first voltage applied to the positive electrode test resistor and a second voltage applied to the negative electrode test resistor, and a voltage estimation unit that estimates a final convergence value of the first and second voltages.

A replica circuit is provided for a buck converter to sense a replica of the current through the low-side switch transistor without the use of a sense resistor.

A signal switching device and a test system are disclosed. A printed wire which is connected with a test circuit can be selected flexibly according to actual situation, and a sufficient distance between adjacent tested printed wires/test printed wires which are used for transmitting a differential signal can be maintained, such that signal interference between the printed wires would not be easily generated. Signals can be effectively separated from each other, and thus the technical problem that signal interference would easily be generated between adjacent tested printed wires/test printed wires which are used for transmitting a differential signal can be solved.

A test fixture includes a plug adaptable to a Universal Serial Bus (USB) Type-C receptacle, a switching circuit, and a control circuit. The plug can be utilized for coupling an electronic device under test. The switching circuit can be utilized for performing switching operations to enable first and second sets of communication paths within the test fixture in turn. The first and the second sets of communication paths are coupled to a first set of communication terminals of the plug and a second set of communication terminals of the plug, respectively. The control circuit can be utilized for controlling the switching operations, to allow a processing circuit to perform first and second sets testing operations on the electronic device through the first and the second sets of communication paths, respectively. A test system and a method for performing testing with aid of the test fixture are also provided.

A test switch for use in electrical power distribution networks is provided. The test switch facilitates the connection between the power distribution networks' equipment and test equipment used to effect tests on the power distribution networks' equipment. The test switch has a solidifying base which decouples the fastening of the body of the switch to the base of the test switch from the fastening of the test switch on an external surface/equipment. Various locking mechanisms for preventing use of or tampering with the test switch are also provided.

A test circuit includes a pull-up device, a pull-down device, a switch circuit and a voltage-setting unit. The pull-up device is used to receive a first control signal and coupled to a first end of the device-under-test. The pull-down device is used to receive a second control signal and coupled to the first end of the device-under-test. The switch unit is controlled by a switch signal, used to receive a testing signal and coupled to a second end of the device-under-test. The voltage-setting unit is controlled by a third control signal, used to pull the second end of the device-under-test to a predetermined voltage.

An apparatus and method for detecting transient voltage at an electrical component of a circuit board is provided. The apparatus including a circuit including a comparator and a latch, wherein a first input of the comparator is electrically coupled to the electrical component, and the comparator receives a threshold voltage at a second input, where the comparator outputs either a high signal or a low signal in response to both the first input and the second input, and an output of the comparator is electrically coupled to an input of the latch such that the latch outputs a high signal in response to receiving a high signal from the comparator, and an indicator electrically coupled to an output of the latch, and where the apparatus is mounted non-permanently to the circuit board to provide a non-permanent electrical coupling between the comparator and the electrical component.

The invention relates to a circuit assembly for the state monitoring and logging of overvoltage protection devices or overvoltage protection systems by means of pulse current monitoring, comprising at least one passive RFID transponder having an inductively coupled voltage supply, wherein in the case of an event of the overvoltage protection device or the overvoltage protection system, the RFID transponder antenna circuit is influenced, in particular interrupted, short circuited, or detuned, so that disturbance processes can be identified. According to the invention, a coil L2 is provided on a discharge line of the overvoltage protection device or the overvoltage protection system that carries pulse currents that occur, which coil L2 is oriented in such a way that the field caused by pulse current passes through the coil winding surface, wherein the coil L2 is connected to at least one switching device, which is connected on the antenna circuit of the RFID transponder to the inductor L1 there in order to influence the antenna circuit at least at times.