The present techniques include methods and systems for detecting a failure in a capacitor bank of an electrical drive system. Embodiments include using discharge resistors to discharge capacitors in the capacitor bank, forming a neutral node of the capacitor bank. In different capacitor configurations, the neutral node is measured, and the voltage is analyzed to determine whether a capacitor bank unbalance has occurred. In some embodiments, the node is a neutral-to-neutral node between the discharged side of the discharge resistors and a neutral side of the capacitor bank, or between the discharged side of the discharge resistors and a discharged side of a second set of discharge resistors. In some embodiments, the node is a neutral-to-ground node between the discharged side of the discharge resistors and a ground potential.

Disclosed is a short-circuit protection circuit for a voltage sampling resistor of a primary side converter, comprising a high voltage power transistor, a high voltage starting resistor, a first voltage dividing resistor of a port VDD, a second voltage dividing resistor of the port VDD, an NMOS transistor, a diode, a first comparator, a second comparator, a third comparator, a time delay circuit, a filter, a first logic circuit, a second logic circuit, a current supply, a first AND gate and a first inverter. The chip of the present disclosure is capable of correctly and effectively detecting whether the sampling resistor is shorted or not before the chip works normally, thereby avoiding the risk of damaging the chip by large current from the voltage feedback port FB due to turn-on of the switching transistor when the upper voltage sampling resistor is shorted, and greatly reducing the input power.

Systems and methods for accurate and fast measurement of junction temperature for power modules are provided. Such systems and methods include a one or more power transistors that each have a respective die surface over which is positioned and electrically coupled to a conductive overlay. A temperature sensor is physically bonded to a top surface of the conductive overlay to provide a direct temperature measurement for the one or more power transistors.

A method for monitoring the line impedance of a protective earth (PE) conductor is provided. The method injects a small stimulus current at a frequency much higher than the grid frequency. The stimulus current circulates in the loops between a grid-connected device and a grid source, creating small voltage drops in the grid conductors, resulting in a common mode voltage which can be measured. The method then includes measuring the common mode voltage and the residual current at a point of common coupling (PCC). The method then includes monitoring the resistive and reactive parts of the line impedance. For example, the method can monitor the line impedance and report a broken PE conductor or a high PE resistance, beyond a given threshold where safety becomes a concern.

An example system includes a component configured to generate a signal associated with a power electronics circuit. The system includes a hardware processor circuit coupled to the component, wherein the hardware processor circuit is configured to: measure, based on a configuration programmed by one or more programmable processor circuits, the signal over an amount of time to generate a first value, the configuration based on a model of the power electronics circuit; and based on a comparison between the first value and a second value satisfying at least one threshold, generate an interrupt associated with the power electronics circuit. Other examples are described.

A power supply device, a method for controlling the same, and a vehicle power control system may prevent damage to electronic components as a reverse voltage preventer cuts off overcurrent flowing in a reverse direction when a reverse voltage is generated as a wire connecting a sensor is shorted.

A discharge handling system includes: a power module; a power conversion device; and an arc discharge detection device, the arc discharge detection device including an arc discharge detector configured to detect occurrence of an arc discharge between the power module and the power conversion device, the arc discharge detection device monitoring the number of times of the arc discharge detected by the arc discharge detector and discharge time of the arc discharge every time a monitoring time elapses. The system includes a determination unit configured to determine necessity of maintenance within a predetermined period on condition that any of conditions (1) to (3) below is satisfied: (1) the number of times of the arc discharge in the monitoring time is from 1 to a number-of-times threshold inclusive; (2) each of the discharge time of the arc discharge in the monitoring time is equal to first determination time or less; and (3) total of the discharge time of the arc discharge in the monitoring time is equal to second determination time or less.

A method for monitoring the line impedance of a protective earth (PE) conductor is provided. The method injects a small stimulus current at a frequency much higher than the grid frequency. The stimulus current circulates in the loops between a grid-connected device and a grid source, creating small voltage drops in the grid conductors, resulting in a common mode voltage which can be measured. The method then includes measuring the common mode voltage and the residual current at a point of common coupling (PCC). The method then includes monitoring the resistive and reactive parts of the line impedance. For example, the method can monitor the line impedance and report a broken PE conductor or a high PE resistance, beyond a given threshold where safety becomes a concern.