One example includes a differential amplifier, a voltage weighting element, coupled to a voltage source which provides an input voltage, to provide a reference voltage with a constant power limit when the input voltage varies, an error amplifier configured to receive and compare the reference voltage provided from the voltage weighting element and a feedback sensed voltage provided from the differential amplifier to identify whether the sensed voltage exceeds the reference voltage, and a pulse width modulation (PWM) controller, coupled to a power transformer and the error amplifier, that reduces a transformer input current provided to the power transformer based on the comparison of the reference voltage from the voltage weighting element and the feedback sensed voltage from the differential amplifier.

A controller includes a phase frequency detection circuit which has a first input coupled to receive a reference clock input, a second input coupled to receive a high-side active output, and an output configured to provide a PFD output. The controller includes a control loop filter which has a first input coupled to receive a slew rate input, a second input coupled to receive the PFD output, and an output configured to provide a high-side length output. The controller includes a pulse generation circuit which has a first input coupled to receive the high-side active output, a second input coupled to receive the high-side length output, and an output configured to provide a fine pulse output. The controller includes a latch configured to provide the high-side active output responsive to a comparison output and the fine pulse output.

Various embodiments relate to a voltage converter including a control unit configured for operating in a hysteretic control mode. A control unit may be configured to receive a PWM signal, a duty cycle signal, at least one reference voltage, a factor of an output voltage of the voltage converter, and a factor of an input voltage of the voltage converter. The control unit may also be configured to compare the at least one reference voltage to the factor of the output voltage and the factor of the input voltage. Further, the control unit may be configured to generate a first control signal mirroring the PWM signal in response to at least one of: the factor of the input voltage being greater than the at least one reference voltage and the factor of the output voltage being greater than the at least one reference voltage. The control unit may also be configured to generate a second, different control signal including a low logic signal in response to the factor of the input voltage being less than or equal to the at least one reference voltage.

A signal processor and method. The signal processor includes a signal current path. The signal processor includes a transconductor. The transconductor has an input operable to receive an input voltage of the signal processor. The transconductor also has an output operable to output a current based on the input voltage. The signal processor also includes a processing stage coupled to the output of the transconductor to receive and process the current outputted by the transconductor. The signal processor further includes a current replicator operable to generate a replica current proportional to the current outputted by the transconductor. The signal processor also includes a comparator operable to compare an output of the current replicator with a reference. The signal processor further includes a current limiter operable to limit the current outputted by the transconductor based on the comparison of the output of the current replicator with the reference.

A device for voltage conversion includes a first, transformerless direct voltage converter unit having a first output potential connection and a second transformerless direct voltage converter unit having a second output potential connection. The two direct voltage converter units have a common input potential connection and a common reference potential connection. The first direct voltage converter unit generates, from the input voltage potential, a first output voltage potential on the first output potential connection, which has a higher voltage potential value relative to the reference voltage potential. The second direct voltage converter unit generates, from the input voltage potential, a second output voltage potential on the second output potential connection, which has a lower voltage potential value relative to the reference voltage potential. The device can be cost-effectively produced and provides sufficient safety.

A buck converter is described having a buck converter output for outputting an output supply voltage; a first power supply domain operably coupled to a power source; a second power supply domain; a power supply controller coupled to the first power supply domain, the second power supply domain and the buck converter output; wherein the power supply controller is configured to supply power to the second power supply domain from the first power supply domain or the buck converter output, in dependence of the buck converter output supply voltage. Changing the current supplied to the second power supply domain to the buck converter output may reduce the quiescent current consumption from a battery power source, prolonging battery life.

Fully integrated, on-chip DC-DC power converters are provided. In one aspect, a DC-DC power converter includes: a SOI wafer having a SOI layer separated from a substrate by a buried insulator, wherein the SOI layer and the buried insulator are selectively removed from at least one first portion of the SOI wafer, and wherein the SOI layer and the buried insulator remain present in at least one second portion of the SOI wafer; at least one GaN transistor formed on the substrate in the first portion of the SOI wafer; at least one CMOS transistor formed on the SOI layer in the second portion of the SOI wafer; a dielectric covering the GaN and CMOS transistors; and at least one magnetic inductor formed on the dielectric. A method of forming a fully integrated DC-DC power converter is also provided.

The present invention relates to a busbar current control circuit, a constant current drive controller and an LED light source, wherein the busbar current control circuit comprises a branch resistor, a branch capacitor and a branch current source, the branch resistor and the branch capacitor are connected in parallel to form a branch, one end of the branch is connected a position between the busbar resistor and the load, and the other end is connect to the branch current source; the branch current source outputs to the branch a current of adjustable magnitude, the sum of the voltage on the busbar resistor and the voltage on the branch resistor remains constant. Wherein the branch resistor occupies a portion of the voltage of the busbar resistor so that the magnitude of the current output by the busbar changes continuously, that is, when the current flowing into the branch increases, the voltage occupied by the branch resistor increases and the voltage on the busbar resistor decreases, so as to reduce the current on the busbar. Since the branch current is smoothly adjusted by the branch current source, the regulation of the output current on the busbar is also smooth. This avoids the use of the SPWM wave or the dimming switch circuit in the prior art, and the stroboscopic phenomenon due to the discontinuity of the driving current.

The present invention relates to a busbar current control circuit, a constant current drive controller and an LED light source, wherein the busbar current control circuit comprises a branch resistor, a branch capacitor and a branch current source, the branch resistor and the branch capacitor are connected in parallel to form a branch, one end of the branch is connected a position between the busbar resistor and the load, and the other end is connect to the branch current source; the branch current source outputs to the branch a current of adjustable magnitude, the sum of the voltage on the busbar resistor and the voltage on the branch resistor remains constant. Wherein the branch resistor occupies a portion of the voltage of the busbar resistor so that the magnitude of the current output by the busbar changes continuously, that is, when the current flowing into the branch increases, the voltage occupied by the branch resistor increases and the voltage on the busbar resistor decreases, so as to reduce the current on the busbar. Since the branch current is smoothly adjusted by the branch current source, the regulation of the output current on the busbar is also smooth. This avoids the use of the SPWM wave or the dimming switch circuit in the prior art, and the stroboscopic phenomenon due to the discontinuity of the driving current.

A sensor device includes a first sensor unit, a control IC configured to switch a power supply route, a power supply, a DC converter, and a regulator configured to regulate the voltage. A power supply route A and a power supply route B is provided as a power supply route from the power supply to the sensor unit and the control IC. In the power supply route A, the sensor unit is not electrically conducted to the power supply, and the control IC is directly connected to the power supply. In the power supply route B, the power supply, the DC converter, and the regulator are connected in series, output of the regulator is supplied to the sensor unit, and output of the DC converter is supplied to the control IC. The control IC switches between the power supply route A and the power supply route B according to an operating state of the sensor unit.