Abstract: A loop controller includes an error amplifier configured to receive an output of a controlled process and further configured to receive a reference input; and an asymmetric compensator. The asymmetric compensator includes a high pass filter configured to receive an amplified version of the reference input and output a filtered reference; and an asymmetric impedance configured to receive an amplified version of the filtered reference and output a compensation signal. The error amplifier is further configured to sum the compensation signal and the output of the controlled process, and provide an error signal based on a difference between the sum and the reference input. The compensation signal includes a first gain for a rising transition of the controlled process output and a second gain for a falling transition of the controlled process output.

Abstract: A DC-DC voltage converter having a switching stage including high- and low-side switches connected in series at a switched node across a DC voltage bus; a control circuit; and a feedback loop connected between an output of the switching stage and an input of the control circuit, the control circuit having a clock signal input and including an error processing circuit coupled to the input for detecting an output of the feedback loop, the control circuit turning OFF the low-side switch and turning ON the high-side switch when the clock signal is detected. The control circuit operates in a cycle-by-cycle operation generating PWM modulation synchronous to the external clock source.

Abstract: A driving circuit for a half bridge utilizing bidirectional semiconductor switches in accordance with an embodiment of the present application includes a high side driver operable to control a high side bidirectional semiconductor switch, wherein the high side driver provides a negative bias voltage to the bidirectional semiconductor switch to turn the high side bidirectional semiconductor switch OFF. A low side driver may be operable to control a low side bidirectional semiconductor switch. An external voltage source with a negative terminal of the voltage source connected to the high side driver may be provided. A high side driving switch may be positioned between the negative terminal of the voltage source and the high side driver and operable to connect the high side driver to the negative terminal of the voltage source when the low side driver turns the low side bidirectional semiconductor switch ON.

Abstract: A driving circuit for a half bridge utilizing bidirectional semiconductor switches in accordance with an embodiment of the present application includes a high side driver operable to control a high side bidirectional semiconductor switch, wherein the high side driver provides a negative bias voltage to the bidirectional semiconductor switch to turn the high side bidirectional semiconductor switch OFF. A low side driver may be operable to control a low side bidirectional semiconductor switch. An external voltage source with a negative terminal of the voltage source connected to the high side driver may be provided. A high side driving switch may be positioned between the negative terminal of the voltage source and the high side driver and operable to connect the high side driver to the negative terminal of the voltage source when the low side driver turns the low side bidirectional semiconductor switch ON.

Abstract: A flyback converter circuit in accordance with an embodiment of the present application includes a DC input operable to receive a DC voltage from a DC voltage source, a transformer including a primary coil and a secondary coil, a primary switch operable to selectively connect the primary coil to the DC input, a controller operable to provide a control signal to turn the primary switch ON and OFF, wherein the primary coil is connected to the DC input when the primary switch is ON, a delay device operable to delay an ON pulse of the control signal provided to the primary switch such that the primary switch is turned on after a delay of a predetermined period of time and a secondary switch connected in series with a capacitor and controlled by the control signal from the controller, wherein the secondary switch and the capacitor are connected in parallel with the primary switch.

Abstract: A driving circuit for a half bridge utilizing bidirectional semiconductor switches in accordance with an embodiment of the present application includes a high side driver operable to control a high side bidirectional semiconductor switch, wherein the high side driver provides a negative bias voltage to the bidirectional semiconductor switch to turn the high side bidirectional semiconductor switch OFF. A low side driver may be operable to control a low side bidirectional semiconductor switch. An external voltage source with a negative terminal of the voltage source connected to the high side driver may be provided. A high side driving switch may be positioned between the negative terminal of the voltage source and the high side driver and operable to connect the high side driver to the negative terminal of the voltage source when the low side driver turns the low side bidirectional semiconductor switch ON.

Abstract: Disclosed is a method of controlling a High Electron Mobility Transistor (HEMT) through a cascode circuit, the cascode circuit including first and second switches, a capacitor connected to a source of the first switch, a source of the HEMT being connected to the drain of the first switch, and a controller for controlling the first and second switches. The method is achieved by defining state A, where the first switch is controlled to be OFF resulting in the HEMT being OFF and the second switch is controlled to be ON allowing the capacitor to be charged and stabilizing the drain voltage of the HEMT at around the HEMT gate threshold voltage. The method further defines state B, where the first switch is controlled to be ON resulting in the HEMT being ON and the second switch is controlled to be OFF almost all the time, thereby preserving the charge stored in the capacitor.

Abstract: A DC-DC voltage converter having a switching stage including high- and low-side switches connected in series at a switched node across a DC voltage bus; a control circuit; and a feedback loop connected between an output of the switching stage and an input of the control circuit, the control circuit having a clock signal input and including an error processing circuit coupled to the input for detecting an output of the feedback loop, the control circuit turning OFF the low-side switch and turning ON the high-side switch when the clock signal is detected. The control circuit operates in a cycle-by-cycle operation generating PWM modulation synchronous to the external clock source.

Abstract: A boost converter in accordance with an embodiment of the present application includes an input rectifying bridge adapted to rectify an input AC voltage, a first inductor connected to the input rectifying bridge, a output capacitor coupled to first inductor for connection to a DC bus, a first bidirectional semiconductor switch coupled between the output capacitor and the first inductor, a second inductor positioned adjacent to the first inductor with a first end connected to a common ground and a second bidirectional semiconductor switch positioned between the second inductor and the output capacitor. An inrush control device may be provided to control the first and second bidirectional semiconductor switches to prevent current inrush.

Abstract: A flyback converter circuit in accordance with an embodiment of the present application includes a DC input operable to receive a DC voltage from a DC voltage source, a transformer including a primary coil and a secondary coil, a primary switch operable to selectively connect the primary coil to the DC input, a controller operable to provide a control signal to turn the primary switch ON and OFF, wherein the primary coil is connected to the DC input when the primary switch is ON, a delay device operable to delay an ON pulse of the control signal provided to the primary switch such that the primary switch is turned on after a delay of a predetermined period of time and a secondary switch connected in series with a capacitor and controlled by the control signal from the controller, wherein the secondary switch and the capacitor are connected in parallel with the primary switch.

Abstract: A circuit is provided for converting power from an AC power source to DC power. The circuit including bi-directional switches capable of conducting and blocking a current flow in both directions. One or more control switches are coupled to a bi-directional switch to enable and disable the current flow through the bi-directional switch, the control switches are controlled by a signal voltage to turn a bi-directional switch ON by discharging a threshold voltage on one of the bi-directional switch gates and turning a bi-directional switch OFF when the threshold voltage is not discharged by the control switches. Additionally, the circuit includes a transformer having one or more primary windings and a secondary winding, each primary winding being coupled to one of the bi-directional switch sources. The current flow through the primary winding is disabled when the current flow through the corresponding bi-directional switch source is disabled.

Abstract: A circuit is provided for converting power from an AC power source to DC power. The circuit including bi-directional switches capable of conducting and blocking a current flow in both directions. One or more control switches are coupled to a bi-directional switch to enable and disable the current flow through the bi-directional switch, the control switches are controlled by a signal voltage to turn a bi-directional switch ON by discharging a threshold voltage on one of the bi-directional switch gates and turning a bi-directional switch OFF when the threshold voltage is not discharged by the control switches. Additionally, the circuit includes a transformer having one or more primary windings and a secondary winding, each primary winding being coupled to one of the bi-directional switch sources. The current flow through the primary winding is disabled when the current flow through the corresponding bi-directional switch source is disabled.

Abstract: Disclosed is a method of controlling a High Electron Mobility Transistor (HEMT) through a cascode circuit, the cascode circuit including first and second switches, a capacitor connected to a source of the first switch, a source of the HEMT being connected to the drain of the first switch, and a controller for controlling the first and second switches. The method is achieved by defining state A, where the first switch is controlled to be OFF resulting in the HEMT being OFF and the second switch is controlled to be ON allowing the capacitor to be charged and stabilizing the drain voltage of the HEMT at around the HEMT gate threshold voltage. The method further defines state B, where the first switch is controlled to be ON resulting in the HEMT being ON and the second switch is controlled to be OFF almost all the time, thereby preserving the charge stored in the capacitor.

Abstract: A driving circuit for a half bridge utilizing bidirectional semiconductor switches in accordance with an embodiment of the present application includes a high side driver operable to control a high side bidirectional semiconductor switch, wherein the high side driver provides a negative bias voltage to the bidirectional semiconductor switch to turn the high side bidirectional semiconductor switch OFF. A low side driver may be operable to control a low side bidirectional semiconductor switch. An external voltage source with a negative terminal of the voltage source connected to the high side driver may be provided. A high side driving switch may be positioned between the negative terminal of the voltage source and the high side driver and operable to connect the high side driver to the negative terminal of the voltage source when the low side driver turns the low side bidirectional semiconductor switch ON.

Abstract: A boost converter in accordance with an embodiment of the present application includes an input rectifying bridge adapted to rectify an input AC voltage, a first inductor connected to the input rectifying bridge, a output capacitor coupled to first inductor for connection to a DC bus, a first bidirectional semiconductor switch coupled between the output capacitor and the first inductor, a second inductor positioned adjacent to the first inductor with a first end connected to a common ground and a second bidirectional semiconductor switch positioned between the second inductor and the output capacitor. An inrush control device may be provided to control the first and second bidirectional semiconductor switches to prevent current inrush.

Abstract: A boost type power supply circuit for providing a DC output voltage comprising first and second semiconductor switches coupled between respective input lines and a common connection, an AC input voltage from an AC source being supplied across the input lines; first and second diodes coupled in series with respective ones of the switches; third and fourth diodes coupled across respective ones of the switches in a free-wheeling relationship with the switches, an inductance coupled in at least one of the input lines; a controller for controlling the conduction times of the switches by providing a pulse width and phase modulated control signal to each of the switches; whereby the controller turns on at least one of the switches during a positive half cycle of the AC voltage to allow energy storage in the inductance and turns off the at least one switch to allow the energy stored in the inductance to be supplied to an attached load through one of the first and second diodes and one of the third or fourth diodes; a