Abstract: Disclosed examples include inverting buck-boost DC-DC converter circuits with a switching circuit to alternate between first and second buck mode phases for buck operation in a first mode, including connecting an inductor and a capacitor in series between an input node and a reference node to charge the inductor and the capacitor in the first buck mode phase, and connecting the inductor and the capacitor in parallel between an output node and the reference node to discharge the inductor and the capacitor to the output node.

Abstract: A controller for a DC-DC converter includes a state machine and a plurality of drivers for controlling switches in the DC-DC converter, where each state in the state machine determines a state of the drivers, and a plurality of timers, where each state in the state machine, other than a passive state, has an associated timer for the state of the drivers.

Abstract: Disclosed examples include inverting buck-boost DC-DC converter circuits with a switching circuit to alternate between first and second buck mode phases for buck operation in a first mode, including connecting an inductor and a capacitor in series between an input node and a reference node to charge the inductor and the capacitor in the first buck mode phase, and connecting the inductor and the capacitor in parallel between an output node and the reference node to discharge the inductor and the capacitor to the output node.

Abstract: A controller for a DC-DC converter includes a state machine and a plurality of drivers for controlling switches in the DC-DC converter, where each state in the state machine determines a state of the drivers, and a plurality of timers, where each state in the state machine, other than a passive state, has an associated timer for the state of the drivers.

Abstract: Methods and apparatus for operating a DC-to-DC voltage converter that has a power stage that includes at least one switching transistor. The output voltage of the DC-to-DC voltage converter is monitored. If the output voltage drops below a lower output voltage threshold, a series of drive pulses is provided to the at least one switching transistor to commence switching of the at least one switching transistor. If the output voltage rises above an upper output voltage threshold, a random number of additional drive pulses is provided to the at least one switching transistor and then the provision of drive pulses to the at least one switching transistor is ceased.

Abstract: Methods and apparatus for operating a DC-to-DC voltage converter that has a power stage that includes at least one switching transistor. The output voltage of the DC-to-DC voltage converter is monitored. If the output voltage drops below a lower output voltage threshold, a series of drive pulses is provided to the at least one switching transistor to commence switching of the at least one switching transistor. If the output voltage rises above an upper output voltage threshold, a random number of additional drive pulses is provided to the at least one switching transistor and then the provision of drive pulses to the at least one switching transistor is ceased.

Abstract: A DCDC converter includes a controller, an up/down counter, a first power stage and a second power stage. The controller generates an up/down control signal. The up/down counter generates a first power stage control signal and a second power stage control signal based on the up/down control signal. The first power stage generates a first output current at a first phase and at a first voltage based on the first power stage control signal. The second power stage generates a second output current at a second phase based on the second power stage control signal. The up/down counter modifies the first power stage control signal to control the first power stage such that the first output current attenuates from a first power stage output to a secondary first power stage output. The controller can further output a control signal to modify the first voltage of the first power stage.

Abstract: A heat exchanger for cooling systems, air conditioning systems, or the like, which is equipped with a de-icing function. For de-icing, the conduits of the heat exchanger are heated and defrosted by an electrical current flow. The drainage of the condensed water is supported by openings in the wings of the wing tubes used.

Abstract: A DCDC converter includes a controller, an up/down counter, a first power stage and a second power stage. The controller generates an up/down control signal. The up/down counter generates a first power stage control signal and a second power stage control signal based on the up/down control signal. The first power stage generates a first output current at a first phase and at a first voltage based an the first power stage control signal. The second power stage generates a second output current at a second phase based on the second power stage control signal. The up/down counter modifies the first power stage control signal to control the first power stage such that the first output current attenuates from a first power stage output to a secondary first power stage output.

Abstract: Heat exchanger 1 for removing heat from a medium with at least one serpentine-shaped wing tube 20 arranged in a housing, the linear wing section 30 of which is arranged such that the wing 24 of the wing section 30 encloses an angle in the range of 10°???30° with a flow direction S.

Abstract: An electronic device for DC-DC conversion including a feedback loop coupled at one side to the inductor for measuring a current through the inductor with a series of an auxiliary capacitor and an auxiliary resistor, a transconductance stage coupled to the auxiliary capacitor for generating a current proportional to a voltage drop across the auxiliary capacitor, wherein the electronic device further includes a ramp resistor coupled to the output of the transconductance stage for generating a ramp voltage across the ramp resistor and a comparator receiving at a first input the ramp voltage, wherein the output of the comparator is coupled to a gate driving stage for driving a power transistor coupled with a control gate to the gate driving stage and with a channel to a switching node of the electronic device.

Abstract: An electronic device for DC-DC conversion including a feedback loop coupled at one side to the inductor for measuring a current through the inductor with a series of an auxiliary capacitor and an auxiliary resistor, a transconductance stage coupled to the auxiliary capacitor for generating a current proportional to a voltage drop across the auxiliary capacitor, wherein the electronic device further includes a ramp resistor coupled to the output of the transconductance stage for generating a ramp voltage across the ramp resistor and a comparator receiving at a first input the ramp voltage, wherein the output of the comparator is coupled to a gate driving stage for driving a power transistor coupled with a control gate to the gate driving stage and with a channel to a switching node of the electronic device.

Abstract: A DC-DC converter with an inductor connected in series with a power transistor between first and second terminals of a DC supply source, and with a modulator circuit that has a control output connected to a control gate of the power transistor. The modulator circuit provides a periodic pulse signal the duty cycle of which determines an output voltage at an output terminal of the converter. The modulator circuit comprises an oscillator that determines the frequency of the periodic pulse signal. The modulator circuit also comprises a feedforward structure that determines an approximated duty cycle for the pulse signal based on the value of the input voltage, the sensed output voltage and the amount of current flow in the inductor. An error amplifier in the modulator has a first input connected to a reference voltage source, a second input connected to the output terminal of the converter and an output that supplies a corrective signal used by the modulator to adjust the duty cycle of the pulse signal.

Abstract: A switch mode power converter is provided which includes a switching cell with a supply input, an output and a control input. A summing comparator has first and second differential input pairs and an output. The output is connected to the control input of the switching cell. An oscillator provides a periodic waveform that is applied to a first one of the inputs of the first differential input pair of the summing comparator. An adjustable reference voltage source provides an adjustable reference voltage a predetermined fraction of which is applied to a second one of the inputs of the first differential input pair of the summing comparator. An error amplifier has differential outputs coupled to the second pair of differential inputs of the summing comparator and a differential input pair.

Abstract: A DC-DC converter with an inductor connected in series with a power transistor between first and second terminals of a DC supply source, and with a modulator circuit that has a control output connected to a control gate of the power transistor. The modulator circuit provides a periodic pulse signal the duty cycle of which determines an output voltage at an output terminal of the converter. The modulator circuit comprises an oscillator that determines the frequency of the periodic pulse signal. The modulator circuit also comprises a feedforward structure that determines an approximated duty cycle for the pulse signal based on the value of the input voltage, the sensed output voltage and the amount of current flow in the inductor. An error amplifier in the modulator has a first input connected to a reference voltage source, a second input connected to the output terminal of the converter and an output that supplies a corrective signal used by the modulator to adjust the duty cycle of the pulse signal.

Abstract: A DC/DC converter circuit including an inductance 10, two controllable switches 12, 14 and a controller 16 for controlling the switches 12, 14 is configured so that it is able to operate in two permanently alternating operating time phases. The switches 12, 14 in the DC/DC converter circuit are arranged so that when the controller 16 is in the first operating time phase it closes the first switch 12 and opens the second switch 14 in achieving a flow of energy from the input of the DC/DC converter circuit to the inductance 10 and then when the controller 16 is in the second operating time phase it opens the first switch 12 and closes the second switch 14 in achieving a flow of energy from the inductance 10 to the output of the DC/DC converter circuit. Prior to switching from one operating time phase into the other operating time phase an intermediate time phase is inserted for safety reasons, in which both switches 12, 14 of the DC/DC converter circuit are briefly opened.

Abstract: The invention relates to a DC/DC converter including an input to which an input voltage Vin is applied, a inductance L whose one terminal is connected to the input, a first controllable switch N1 via which the other terminal of the inductance is connectable to a reference potential Vss, a second controllable switch P1 via which the other terminal of the inductance is connectable to the output of the converter, and a regulator circuit 1 configured so that it is able to control the two switches in regulating the output voltage of the DC/DC converter to a predetermined wanted value. The second controllable switch is a PMOS-FET.

Abstract: A switch mode power converter is provided which includes a switching cell with a supply input, an output and a control input. A summing comparator has first and second differential input pairs and an output. The output is connected to the control input of the switching cell. An oscillator provides a periodic waveform that is applied to a first one of the inputs of the first differential input pair of the summing comparator. An adjustable reference voltage source provides an adjustable reference voltage a predetermined fraction of which is applied to a second one of the inputs of the first differential input pair of the summing comparator. An error amplifier has differential outputs coupled to the second pair of differential inputs of the summing comparator and a differential input pair.

Abstract: The invention relates to a DC/DC converter including an input to which an input voltage Vin is applied, a inductance L whose one terminal is connected to the input, a first controllable switch N1 via which the other terminal of the inductance is connectable to a reference potential Vss, a second controllable switch P1 via which the other terminal of the inductance is connectable to the output of the converter, and a regulator circuit 1 configured so that it is able to control the two switches in regulating the output voltage of the DC/DC converter to a predetermined wanted value. The second controllable switch is a PMOS-FET.

Abstract: A DC/DC converter circuit including an inductance 10, two controllable switches 12, 14 and a controller 16 for controlling the switches 12, 14 is configured so that it is able to operate in two permanently alternating operating time phases. The switches 12, 14 in the DC/DC converter circuit are arranged so that when the controller 16 is in the first operating time phase it closes the first switch 12 and opens the second switch 14 in achieving a flow of energy from the input of the DC/DC converter circuit to the inductance 10 and then when the controller 16 is in the second operating time phase it opens the first switch 12 and closes the second switch 14 in achieving a flow of energy from the inductance 10 to the output of the DC/DC converter circuit. Prior to switching from one operating time phase into the other operating time phase an intermediate time phase is inserted for safety reasons, in which both switches 12, 14 of the DC/DC converter circuit are briefly opened.