The absorption circuit of the present invention is applied in a feed circuit, wherein the absorption circuit comprises a comparison unit and a regulation unit, and the comparison unit is employed to receive a voltage of a transformer primary dotted terminal of the feed circuit, and to compare the voltage with a first preset voltage and a second preset voltage and to output a comparison result, and the regulation unit is employed to regulate a resistor and a capacitor coupled to the transformer according to the comparison result, wherein the first preset voltage is larger than the second preset voltage. Therefore, the present invention can control the resistor and the capacitor coupled to the transformer according to the leakage inductance (i.e. the voltage) of the transformer, and then to adaptively restrain the corresponding voltage peak and EMI.

Various implementations described herein are directed to a methods and apparatuses for disconnecting, by a device, elements at certain parts of an electrical system. The method may include measuring operational parameters at certain locations within the system and/or receiving messages from control devices indicating a potentially unsafe condition, disconnecting and/or short-circuiting system elements in response, and reconnection the system elements when it is safe to do so. Certain embodiments relate to methods and apparatuses for providing operational power to safety switches during different modes of system operation.

Various implementations described herein are directed to a methods and apparatuses for disconnecting, by a device, elements at certain parts of an electrical system. The method may include measuring operational parameters at certain locations within the system and/or receiving messages from control devices indicating a potentially unsafe condition, disconnecting and/or short-circuiting system elements in response, and reconnection the system elements when it is safe to do so. Certain embodiments relate to methods and apparatuses for providing operational power to safety switches during different modes of system operation.

A vehicle includes a power converter having an inductor electrically disposed between a traction battery and an electric machine. The vehicle includes a controller configured to reduce a power limit of the power converter. The reduction is responsive to an increase of a ratio of voltage across the inductor to a rate of change of current through the inductor.

A vehicle includes a power converter having an inductor electrically disposed between a traction battery and an electric machine. The vehicle includes a controller configured to reduce a power limit of the power converter. The reduction is responsive to an increase of a ratio of voltage across the inductor to a rate of change of current through the inductor.

Various implementations described herein are directed to a methods and apparatuses for disconnecting, by a device, elements at certain parts of an electrical system. The method may include measuring operational parameters at certain locations within the system and/or receiving messages from control devices indicating a potentially unsafe condition, disconnecting and/or short-circuiting system elements in response, and reconnection the system elements when it is safe to do so. Certain embodiments relate to methods and apparatuses for providing operational power to safety switches during different modes of system operation.

Various implementations described herein are directed to a methods and apparatuses for disconnecting, by a device, elements at certain parts of an electrical system. The method may include measuring operational parameters at certain locations within the system and/or receiving messages from control devices indicating a potentially unsafe condition, disconnecting and/or short-circuiting system elements in response, and reconnection the system elements when it is safe to do so. Certain embodiments relate to methods and apparatuses for providing operational power to safety switches during different modes of system operation.

In described examples of methods and control circuitry to control a multi-level power conversion system, the control circuitry generates PWM signals having a duty cycle to control an output signal. The duty cycle is adjustable in different switching cycles. Each switching cycle includes a respective first sub-cycle with a first sub-cycle duration and a respective second sub-cycle with a second sub-cycle duration. The control circuitry controls a given switching cycle's first and second sub-cycle durations to control a voltage across a capacitor of the power conversion system while maintaining the given switching cycle's duty cycle.

In described examples of methods and control circuitry to control a multi-level power conversion system, the control circuitry generates PWM signals having a duty cycle to control an output signal. The duty cycle is adjustable in different switching cycles. Each switching cycle includes a respective first sub-cycle with a first sub-cycle duration and a respective second sub-cycle with a second sub-cycle duration. The control circuitry controls a given switching cycle's first and second sub-cycle durations to control a voltage across a capacitor of the power conversion system while maintaining the given switching cycle's duty cycle.

The present invention relates to a converter circuit (1) for reducing a nominal capacitor voltage, the converter circuit (1) comprising: an input node (TI.sub.1), which is configured to receive an input voltage (V.sub.G); an output node (TO.sub.1; TO2), which is configured to supply an output voltage (V.sub.O) to a load (R.sub.L1; R.sub.L2); and a capacitor (C.sub.1; C.sub.2), which is coupled to the load so that the input voltage is divided between the capacitor (C.sub.1; C.sub.2) and the load (R.sub.L1; R.sub.L2) and which is configured to be charged up to a voltage corresponding to a differential voltage between the input voltage (V.sub.G) and the output voltage (V.sub.O).