A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information and amplitude associated with the resistive-inductive-capacitive sensor, and a noise detection circuit communicatively coupled to the measurement circuit and configured to determine a presence of external interference in the system based on at least one of the phase information and the amplitude information.

A measurement device with improved electrical strength comprises an input for receiving an input signal as well as a measurement circuit connected with the input. The measurement circuit has at least one component. The measurement device also comprises an electrical interface provided in addition to the input. The measurement device further comprises at least one internal enclosure that encloses the component within the measurement device, thereby improving the electrical strength of the measurement device.

The systems determine the parasitic capacitance of a signal path. That parasitic capacitance is then used to determine a leakage characteristic of the signal path, such as leakage current or leakage resistance. The capability of ATE channels to force current accurately, and to measure time intervals at prescribed voltages, can be used to multiply the accuracy of the force current function. Using these resources, small leakage currents—for example, on the order of 10 nA or less—can be measured.

An apparatus and battery system for estimating insulation resistance including an insulation resistance measurement circuit connected to a first electrode of a battery, a first switch connected to the first resistor, a second resistor connected to the first switch, a third resistor connected to the second resistor and a second electrode of the battery, and a second switch connected between a first contact point between the first switch and the second resistor and a chassis ground, a voltage measurement part measuring a voltage of a second contact point between the second resistor and the third resistor, and a controller controlling the first and second switches and calculating an insulation resistance value based on the voltage measured at the second contact point the first and second switches are ON, and the voltage measured at the second contact point while the first switch is OFF and the second switch is ON.

An insulation resistance detection device detects a voltage at a connection point between a coupling capacitor and a resistance in the case where a frequency signal is outputted to the resistance, and detects an insulation resistance between a ground portion and a power supply path based on a moving average value of a detection voltage. The insulation resistance detection device includes a first determination unit, a resistance detection unit, and a second determination unit. In response to a determination that the pulsation of the detection voltage is attenuated, the resistance detection unit detects the insulation resistance based on, instead of a first moving average value, a second moving average value calculated by using the detection voltage in a second range including a smaller number of detection voltages than in the first range.

In an insulation resistance detection apparatus, a voltage determiner determines whether a detection voltage, which has changed by at least a preset value, becomes stable at around a changed voltage value. A resistance determiner determines a value of an insulation resistance between a ground portion and a power-supply path based on a currently sampled value of the detection voltage instead of a moving average in response to determination that the detection voltage, which has changed by at least the preset value, becomes stable at around the changed voltage value.

An inverter and a method for detecting insulation impedance of the inverter are provided. During grid-connected operation of the inverter, the method includes: controlling a power supply to output two different test signals, and recording voltages of a power grid to ground corresponding to the two test signals; and calculating the insulation impedance to ground of the inverter during the grid-connected operation of the inverter according to the two test signals and the voltages of the power grid to ground corresponding to the two test signals. According to the present disclosure, the power supply outputs different test signals to disturb the voltage of the power grid to ground, so as to detect insulation impedance of the inverter during grid-connected operation of the inverter.

An apparatus for a battery system includes a switching unit and a processing unit. The switching unit includes a plurality of switching branches and a plurality of switching switches, where each of the plurality of switching branches includes a switching resistor, and the plurality of switching switches are configured to control the plurality of switching branches to be switched in or out between the following plurality of terminals and a reference ground: a positive electrode of a battery pack, a second terminal of a first contactor, a negative electrode of the battery pack, and a second terminal of a second contactor. The processing unit is configured to detect sampling point voltage information of the plurality of switching branches.

A system and method for assisting the start of an electrically powered vehicle comprising processing circuitry configured to: a) receive a sensory signal indicative of a sequence of voltage measurements during an initial ramp state, b) compare the sequence of voltage measurements with a previously established plurality of voltage patterns, c) select a voltage pattern whose voltage values are closest to the voltage values of the sequence of voltage measurements received from the sensor, d) establish the insulation resistance value of the battery from selected voltage pattern, and e) enable electrically energizing a load indicative of vehicle start if the insulation resistance value obtained exceeds a predetermined insulation resistance threshold value that ensures the insulation of the battery.

It is described a leakage compensation circuit for a measurement device which comprises a measurement circuit with a leaking device that is connected to a measurement path and causes a leakage current. The leakage compensation circuit comprises: i) a replica device of the leaking device, wherein the replica device is connected to a replica path, and wherein the replica device is configured to cause a replica leakage current that is essentially equal to the leakage current of the leaking device, ii) a voltage regulator which is connected to the measurement path and to the replica path, wherein the voltage regulator is configured to regulate the voltage in the replica path based on the voltage of the measurement path, and iii) a current mirror which is connected to the measurement path and to the replica path, wherein the current mirror is configured to mirror the replica leakage current of the replica device into the measurement path.