The invention relates to an insulated DC/DC converter comprising: a magnetic component having a primary part and a secondary part separated by an electrical insulation barrier; breakers linked to the primary part of the magnetic component allowing the magnetic component to transfer energy from the primary part to the secondary part and to store energy at the level of the primary part; and in which the secondary part of the magnetic component comprises a first arm and a second arm, each arm comprising a first breaker, a secondary and a second breaker in series; an intermediate point of the secondary of the first arm being connected to an intermediate point of the secondary of the second arm.

Methods, systems, and apparatus to facilitate a fault triggered diode emulation mode of a transistor. An example apparatus includes a driver to output a control signal to a gate terminal of a transistor of a power converter; and a diode emulation control circuit to, in response to determining a fault corresponding to the transistor, enable the transistor when current flows in a direction from a source terminal of the transistor to a drain terminal of the 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.

The present disclosure relates to an undervoltage protection circuit for a DC/DC converter of an electrified vehicle. The DC/DC converter generally operates in a first precharge stage, a second precharge stage and a buck mode. The undervoltage protection circuit comprises a threshold value switching unit which is connected with a controller and configured for receiving a control signal from the controller and switching among at least two predetermined undervoltage protection threshold values based on the control signal as received. The undervoltage protection circuit also comprises an undervoltage protection unit configured for outputting a signal indicating whether to activate an undervoltage protection based on a comparison between the switched undervoltage protection threshold value and a sampled voltage value from a high voltage side of the DC/DC converter. In the circumstance that the DC/DC converter operates in the buck mode, the undervoltage protection unit will activate the undervoltage protection such as to prevent a large current flowing from a low side voltage side to the high voltage side if the sampled voltage value is less than or equal to the switched undervoltage protection threshold value, and the DC/DC converter will continuously operate in the buck mode if the sampled voltage value is greater than the switched undervoltage protection threshold value. The present disclosure also relates to a method of undervoltage protection for a DC/DC converter of an electrified vehicle.

A current limit peak regulation circuit, a current limit circuit and a power converter including the current limit peak regulation circuit. The current limit peak regulation circuit provides a current limit threshold to limit a maximum allowable peak current value of a current flowing through a main switch of the power converter and adjusts the current limit threshold to decrease with decrease in a switching frequency of the power converter when the power converter is in a constant voltage mode so as to reduce power dissipation of the power converter in standby mode.

A power supply using a microcontroller for circuit protection and an LED lighting system using the power supply are disclosed. A power supply according to embodiments of the present invention includes a floating converter and at least a first reference voltage source connected to a negative output terminal of the floating converter. A microcontroller is connected to the first reference voltage source and to a control input of the floating converter, which may be a floating buck converter. In some embodiments, a second reference voltage source is connected to the microcontroller. A voltage divider and/or a comparator can be used to provide one or both voltage reference sources.

A diagnostic system for a DC-DC voltage converter having a low voltage bi-directional MOSFET switch is provided. The low voltage bi-directional MOSFET switch has first and second nodes. The microcontroller samples a first voltage at the first node at a first sampling rate utilizing a first common channel in a first bank of channels to obtain a first predetermined number of voltage samples. The microcontroller determines a first number of voltage samples in the first predetermined number of voltage samples in which the first voltage is less than a first threshold voltage. The microcontroller sets a first voltage diagnostic flag equal to a first fault value if the first number of voltage samples is greater than a first threshold number of voltage samples indicating a voltage out of range low fault condition for the analog-to-digital converter.

Disclosed examples include methods, integrated circuits and switch circuits including a driver circuit and a silicon transistor or other current source circuit coupled with a gallium nitride or other high electron mobility first transistor, where the driver operatives in a first mode to deliver a control voltage signal to the first transistor, and in a second mode in response to a detected overvoltage condition associated with the first transistor to control the current source circuit to conduct a sink current from the first transistor to affect a control voltage to at least partially turn on the first transistor.

An isolated synchronous rectification type DC/DC converter, includes: a transformer including primary and secondary windings; a switching transistor connected to the primary winding; a synchronous rectifying transistor installed between the secondary winding and a ground line on the secondary side; a photocoupler including a light emitting device and a light receiving device; a feedback circuit driving the light emitting device such that an output voltage of the DC/DC converter approaches a target voltage; a primary side controller connected to the light receiving device and switching the switching transistor depending on feedback signal from the photocoupler; a synchronous rectification controller controlling the rectifying transistor; and a protection circuit including a temperature detection element, one end of the detection element connected to a drain of the rectifying transistor, the protection circuit configured to detect an overheated state of the rectifying transistor depending on a first signal generated by the temperature detection element.

A DC-DC converter including a bridge circuit unit electrically connected to a DC link capacitor and comprising at least one full bridge circuit comprising switching elements; a sensing unit for sensing a voltage between the bridge circuit unit and the DC link capacitor; and a control unit for controlling the bridge circuit unit according to the sensed voltage, wherein a power of one end of a battery is controlled to a droop curve-shaped power value according to the sensed voltage, wherein the DC-DC converter further comprises an inductor and a capacitor electrically connected to the bridge circuit unit, the inductor is connected to one end of a battery, the capacitor is connected to one end of the battery and a node on the other end of the battery, and the node is connected to and arranged between the inductor and the battery.