It is an object to provide a device for estimating the equivalent input voltage of a boost converter. According to a first aspect, a device is configured to apply a switching signal to a boost converter, wherein the boost converter is configured to provide a voltage for a haptic feedback element; wait for at least one time interval; measure at least one voltage on an output side of the boost converter; and estimate an equivalent input voltage of the boost converter based on the at least one measured voltage, wherein the equivalent input voltage represents a physical input voltage that would cause the at least one measured voltage in reference conditions. A device, a method, and a computer program are described.

An over-voltage comparator and shutdown circuit for a power converter, comprising at least a first voltage divider connected between ground and a monitored voltage, the voltage divider including a first resistor and a second resistor, a switch mode regulator connected to a primary switch of the power converter, and a first threshold comparator, wherein a monitored input of the first threshold comparator is connected between the first resistor and the second resistor, an anode of the first threshold comparator is connected to ground, and a cathode of the first threshold comparator is connected to the switch mode regulator, and wherein the monitored voltage is voltage at an end of a primary winding of the power converter. An auxiliary output circuit of the power converter may be provided having a first output providing the monitored voltage and a second output providing power to the switch mode regulator.

The invention relates to a device for operating a voltage converter (1), in particular a DC converter, of a motor vehicle, which voltage converter has at least two parallel-connected converter strands (4, 5) which are connected between a high-voltage side (2) and a low voltage side (3) of the voltage converter (1) for converting the voltage, having at least one cooling device (8) carrying a coolant (9) and assigned to the converter strands (4, 5), wherein each of the converter strands (4, 5) is assigned at least one temperature sensor (6, 7), comprising the following steps: a) detecting an input voltage, an output voltage and an operating current of each converter strand (4, 5), b) detecting a current converter strand temperature by means of the respective temperature sensor (6, 7), c) determining a respective coolant temperature as a function of the values detected in steps a) and b), d) comparing the two determined coolant temperatures (T_1, T_2) with each other and e) determining the serviceability of the temperature sensors (6, 7) on the basis of the result of the comparison.

A driver circuit comprises a first buffer receiving a control signal, and a first transistor coupled to first buffer and an output. A second transistor is coupled to a first current mirror and the output. A third transistor is coupled to the output and an inverter. A fourth transistor receives the inverter's output at its control input and is coupled to the output. A fifth transistor is coupled to third transistor. The second, third, and fifth transistors receive supply voltage at their respective control inputs. A sixth transistor receives the control signal's inverse at its control input and is coupled to fifth transistor and a second current mirror. A current source is coupled to second current mirror and a second buffer. A seventh transistor receives the second buffer's output at its control input and is coupled to first buffer. An eighth transistor is coupled to first buffer and seventh transistor.

A power control device includes: an output voltage controller configured to control an output voltage based on a feedback voltage corresponding to the output voltage; and an overvoltage protector configured to continue or stop the operation of the output voltage controller based on a first detection result of whether the output voltage has exceeded an output voltage threshold value and a second detection result of whether the feedback voltage has fallen to or below a feedback voltage threshold value.

A power circuit having a reverse voltage recovery boost circuit that speeds up a recovery time of the power circuit after a reverse voltage condition has cleared is provided. The power circuit includes a reverse voltage detector that detects the reverse voltage condition. After the reverse voltage condition clears, the reverse voltage recovery boost circuit transfers a portion of power to one transistor that is stored in another transistor thereby transitioning the one transistor from a non-conductive state to a conductive state, which allows a transfer of power from the input voltage to the output voltage.

A drive device comprises a sensor for detecting a state of stress applied to a power transistor, a threshold voltage setting circuit for outputting a threshold voltage, an anomaly monitor circuit for determining whether or not a state of stress is abnormal by comparing a detected voltage of the sensor with the threshold voltage, and a control circuit for fixing the power transistor to either on or off when the state of stress is determined to be abnormal by the anomaly monitor circuit. When an operating mode is a test mode, the control circuit tests whether the anomaly monitor circuit determines the state of the stress is abnormal or not by switching a level of the threshold voltage set by the threshold voltage setting circuit so as to determine that a state of the stress applied to the power transistor is abnormal in the normally operating anomaly monitor circuit.

A power transfer device includes an oscillator circuit having a first node, a second node, and a control terminal. The oscillator circuit includes a cascode circuit comprising transistors having a first conductivity type and a first breakdown voltage. The cascode circuit is coupled to the control terminal, the first node, and the second node. The oscillator circuit includes a latch circuit coupled between the cascode circuit and a first power supply node. The latch circuit includes cross-coupled transistors having the first conductivity type and a second breakdown voltage. The first breakdown voltage is greater than the second breakdown voltage. The oscillator circuit may be configured to develop a pseudo-differential signal on the first node and the second node. The pseudo-differential signal may have a peak voltage of at least three times a voltage level of an input DC signal on a second power supply node.

The purpose of the present invention is an electrical system allowing conversion of a direct voltage into another direct voltage, including: a resonant DC-DC converter including an LLC converter circuit, a control unit including: a first module for determining the rms resonance current value from a measurement of the output current, a second module for determining a maximum value of the voltage at the terminals of each resonance capacitor and a minimum value of the voltage at the terminals of each resonance capacitor using rms resonance current value, a comparison module, a disconnection element configured to stop operation of the resonant DC-DC converter in the event of an overload.

A power converter with ground fault protection (PCGFP) circuit includes an input stage, a first voltage converter, and an output stage. The input stage is connected to a power bus to receive an input direct current (DC) voltage. The first voltage converter converts the input DC voltage to a second voltage and switches between an open and closed state to regulate power present on the power bus. The output stage includes a second voltage converter circuit to generate an output voltage having a different voltage level from the input DC voltage. A controller controls operation of the first and second voltage converters and is also capable of detecting a ground fault on the power bus. The controller operates the first and second voltage converts in a fault isolation mode in response to detecting the ground fault such that the first and second voltage converters isolate the ground fault.