A high voltage logic circuit for high voltage system application comprises a first device layer formed from a first semiconductor material and comprises a low voltage logic circuit; and a second device layer formed from a second different semiconductor material and comprising one or more components of an additional circuit for generating a high voltage logic output from a low voltage logic input from the low voltage logic circuit; wherein the first and second device layers are integrally formed. Also, a logic circuit comprising: a low voltage logic input; a high supply voltage input; a circuit ground voltage input; a high voltage output; a first tail device made from a first semiconductor material; and a second tail device made from a second different semiconductor material; wherein the first and second tail devices are coupled, in series, between the high voltage output and the circuit ground voltage input; and wherein respective gates of the first and second tail devices are coupled, in parallel, to the low voltage logic input.

A device includes a voltage regulator circuit, a power switch circuit, and a control circuit. The voltage regulator circuit generates an output voltage at an output terminal. The power switch circuit is coupled to the voltage regulator circuit. The control circuit receives a first control signal and generates a second signal that includes a first portion gradually declining between a first time and a second time later than the first time. When the voltage regulator circuit is turned off and a logic state of the first control signal changes at the first time, the power switch circuit is turned on at the second time, in response to the second control signal, to adjust the output voltage.

An AC-DC power conversion system provides extended voltage gain characteristic by virtue of controlling a duty cycle of operation associated with the desired input-to-output gain. The AC-DC power conversion system includes an AC-stage, first and second inductors, first and second voltage-doubler stages, a totem-pole rectifier stage, and a DC-stage coupled across the totem-pole rectifier stage. Each voltage-doubler stage includes a first terminal, a second terminal, and a third terminal, wherein a first terminal of the AC-stage is coupled by the first inductor to the first terminal of each voltage-doubler stage and by the second inductor to the third terminal of each voltage-doubler stage. The totem-pole rectifier stage includes first and second terminals coupled, respectively, to the second terminal of the first voltage-doubler stage and the second terminal of the second voltage-doubler stage.

An AC-DC power conversion system provides extended voltage gain characteristic by virtue of controlling a duty cycle of operation associated with the desired input-to-output gain. The AC-DC power conversion system includes an AC-stage, first and second inductors, first and second voltage-doubler stages, a totem-pole rectifier stage, and a DC-stage coupled across the totem-pole rectifier stage. Each voltage-doubler stage includes a first terminal, a second terminal, and a third terminal, wherein a first terminal of the AC-stage is coupled by the first inductor to the first terminal of each voltage-doubler stage and by the second inductor to the third terminal of each voltage-doubler stage. The totem-pole rectifier stage includes first and second terminals coupled, respectively, to the second terminal of the first voltage-doubler stage and the second terminal of the second voltage-doubler stage.

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 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.

An electrical circuit for detecting circuit defects and/or for preventing overvoltages in controllers. The electrical circuit including a power controller circuit, encompassing a first transistor, a control loop including an operation amplifier and a first reference voltage source, and feedback resistors, and an overvoltage suppression circuit, encompassing a second transistor, a control loop including an operation amplifier and a reference voltage source, and feedback resistors, the power controller circuit being provided to make a voltage available for the overvoltage suppression circuit and the overvoltage suppression circuit being provided to make a protected voltage available.

A switching device includes: a lower switching element, an upper switching element having a source connected to a drain of the lower switching element; a control circuit including a first output part that supplies a driving signal to the lower switching element; a Zener diode having a cathode connected to the first output part; a parallel capacitor connected to the Zener diode in parallel; a resistor connected between an anode of the Zener diode and a gate of the lower switching element; and a gate-side capacitor provided separate from a parasitic capacitance of the lower switching element, having a larger capacitance than the parasitic capacitance of the lower switching element, and connected, outside the lower switching element, between the gate and a source of the lower switching element. The capacitance of the gate-side capacitor is smaller than a capacitance of the parallel capacitor.

A switching device includes: a lower switching element, an upper switching element having a source connected to a drain of the lower switching element; a control circuit including a first output part that supplies a driving signal to the lower switching element; a Zener diode having a cathode connected to the first output part; a parallel capacitor connected to the Zener diode in parallel; a resistor connected between an anode of the Zener diode and a gate of the lower switching element; and a gate-side capacitor provided separate from a parasitic capacitance of the lower switching element, having a larger capacitance than the parasitic capacitance of the lower switching element, and connected, outside the lower switching element, between the gate and a source of the lower switching element. The capacitance of the gate-side capacitor is smaller than a capacitance of the parallel capacitor.

An integrated circuit includes a current detection circuit configured for coupling to an output terminal of a voltage regulator, the output terminal providing a total current that is divided into a load current to a load device and a feedback current for providing a feedback signal to the voltage regulator. The current detection circuit includes a current sampling circuit and a current comparator circuit. The current sampling circuit provides a first current that is proportional to the total current, a second current that is proportional to the feedback current, and a third current that is proportional to the load current. The current comparator circuit is configured to compare the third current with a threshold current, and output a detection signal that indicates whether the third current matches the threshold current, thereby indicating a target load device is detected.