67 results about "Boost power converter" patented technology

A dual output buck-boost power converter operates with a single inductor to achieve high efficiency with automatic or inherent load balancing. Switches associated with the opposite polarity outputs are driven based on feedback signals, with one feedback signal being a reference voltage and another feedback signal being related to an opposite polarity output. The opposite polarity feedback signal is provided to a comparator with a reversed polarity to achieve a simple balanced control that maintains polarity outputs. The power converter delivers power to each output with each switching cycle and uses a single inductor to achieve high efficiency performance.

A protection circuit for a boost power converter provides input under-voltage protection and output over-voltage and over-current protection. The protection circuit includes a control power MOSFET connected in series between the ground of the boost power converter and the ground of the load. The arrangement of the circuit makes it easy to drive the gate of an N-channel power MOSFET and is ideal for current-limiting control, which utilizes the Rds-on of the MOSFET as a current sensing element. Neither a specific gate-driver nor a current sensing resistor is required, and thus high efficiency can be achieved. Furthermore, the slow slew-rate at the gate of the MOSFET provides a soft-start to the load. The protection circuit includes a temperature compensation circuitry to offset the variation of the Rds-on. A time delay circuit prevents the switching elements and protection elements from overload damage.

A novel switching hysteretic power converter is presented. The power converter combines the function of a capacitive charge pump with the function of an inductive step down converter to obtain a switching boost converter with a much simpler control method with respect to conventional inductive boost power converters. The hysteretic control provides stable operation in all conditions with excellent load transient response. Furthermore the hysteretic control allows high frequency switching reducing the size and cost of the passive components. The Discontinuous Conduction Mode of operation provides very high efficiency even at light loads. The presented power converter can be operated as a boost converter or as a buck converter simply by changing the switching phase of one switch. In both types of operation the efficiency of the hysteretic power converter can be quite high even at high switching frequencies.

A voltage boost power converter circuit, having an input inductor, active switch, and a transformer having primary, secondary and auxiliary windings. A clamping capacitor and a first passive switch are in series across the primary winding. The auxiliary winding and a second passive switch are in series, connected to the node between the clamping capacitor and first passive switch. The active switch is connected between ground the primary winding. A bulk capacitor forms a series loop including the active switch and primary winding. The method efficiently resets a the transformer, by transferring power to a load through the primary winding, and discharging a clamping capacitor through a separate inductively linked winding of the transformer during an ON state; and clamping the active switch voltage with the clamping capacitor, charging the clamping capacitor with a leakage inductance of the transformer, and charging the bulk capacitor during an OFF state.

A bidirectional buck-boost power converter 13 including a pair of inverter modules 14, 15 disposed at an output of a machine, and an inductor L_o connected between the pair of inverter modules 14, 15. A method for controlling a voltage output of a machine starter generator having an inverter rectifier and bidirectional buck-boost converter, includes outputting a dc voltage controlled by bidirectional buck-boost pulse width modulation (PWM) switching control, when the starter generator is in a generator mode.

A switching power supply device has a boost power converter which converts a wide range of AC input voltages into a DC voltage larger than an amplitude of the AC input voltage to supply to a DC-DC converter. The switching power supply device includes a load detection circuit, an input voltage detection circuit, and a power conversion controller for the boost power converter. The power conversion controller corrects the determination reference value in accordance with the AC input voltage detected in the input voltage detection circuit. When a light load is detected based on a comparison between the corrected determination reference value and the detection value output from the load detection circuit, the controller disables the boost power converter.

A bidirectional DC to DC power converter includes two DC sources, two inductors respectively connected to the two DC sources, a first switch and a second switch respectively connected to the two inductors, two capacitors respectively connected to the two switches, and a third switch connected between the two inductors. The first, second and third switches are respectively connected reversely with a diode in parallel. When the third switch is alternately turned on and off and the first and second switches are always turned off, the power converter operates as a boost power converter and electric energy flows from the two DC sources to the two capacitors. When the third switch is always turned off and the first and second switches are synchronously turned on or off, the power converter operates as a buck power converter and electric energy flows from the two capacitors to the two DC sources.

The invention relates to a control method for a micro-grid hybrid energy storage system. The control method comprises the following steps: selecting inductive current i L (lower coordinate) and capacitor voltage u c (lower coordinate) as state variables, and energy storage unit voltage u i (lower coordinate) and load current i Load (lower coordinate) as input variables for a buck/ boost power converter in the micro-grid hybrid energy storage system; building a small signal model of buck/ boost power converter based on PWM (Pulse-Width Modulation) complementary control; respectively designing control circuits for a storage battery and a super capacitor; controlling the charging and discharging of the storage battery and stabilize low-frequency component of synthetic load through a single current loop; stabilizing the difference between the synthetic load power and storage battery power through the upper capacitor; adding power feed-forward to the voltage-current double closed-loop control so as to inhibit the fluctuation of the voltage of a DC bus. According to the control method for the micro-grid hybrid energy storage system, each load power in a micro-grid is taken into full account, a plurality of control methods are carried out to stabilize the high-frequency fluctuation of power, thus the fluctuation of the voltage of the DC voltage is inhibited, and the stability of the voltage of the DC bus in working is maintained.

An apparatus and method for a boost power converter with improved electrical overstress (EOS) tolerance is disclosed. A boost power converter provides a providing a pulse width modulation (PWM) boost power converter with an electrical overstress (EOS) boost over-voltage comparator/switch network comprises a boost power converter, a boost overvoltage comparator, a boost overvoltage comparator feedback network, and a boost overvoltage switch. The methodology for the boost converter with improved electrical overstress (EOS) tolerance defines an absolute maximum voltage condition, provides a voltage limit below the defined absolute maximum voltage condition, and initiates turn-on of the boost overvoltage switch according to the voltage limit.

The invention discloses a control circuit of a buck-boost power converter, which is used for generating a control signal for manipulating a buck-boost power level and also used for converting an input voltage into an output voltage, and is characterized by comprising a feedback circuit, an error amplifier, a waveform generator, a frequency controller, a frequency generator, a pulse width modulation comparator and a gate driver. The control circuit and control method of the buck-boost power converter have the advantages of improving the stability of the buck-boost power converter, reducing the switching loss of the buck-boost power level and improving the efficiency of the buck-boost power converter.

Methods, systems, and devices are described for using coupled inductor boost circuits to operate in a zero current switching (ZCS) and/or a zero voltage switching (ZVS) boundary mode. Some embodiments include a coupled inductor boost circuit that can substantially eliminate rectifier reverse recovery effects without using a high side primary switch and a high side primary switch driver. Other embodiments include a coupled inductor boost circuit that can achieve substantially zero voltage switching. ZCS and ZVS modes may be effectuated using control techniques. For example, a magnetizing current may be sensed or otherwise represented, and a signal may be generated accordingly for controlling switching of the controller.

A novel method to operate and control single inductor multiple output switching power converter is presented. The method includes the means for generating one or more synthetic ripple signals and operating the converter at constant switching frequency allowing high frequency operation, maintaining stability in all conditions with minimum cross regulation between the outputs independently on the levels of load present at the outputs. The method further includes means for setting the maximum frequency of multiplexing the energy stored in the inductor between the various outputs reaching the desired compromise between the value of the output capacitors, the switching frequency of the output power devices and the acceptable output voltage ripple.

Two different topologies are proposed that can be used for single inductor multiple output buck power converters and for boost power converter allowing the extension to buck-boost configurations as well.

A control circuit and method are proposed to generate a control signal to operate a buck-boost power stage of a buck-boost power converter to convert an input voltage to an output voltage. The control circuit and method detect the output voltage to generate an error signal, control the frequency of two ramp signals according to the error signal, generate two pulse width modulation signals according to the error signal and the two ramp signals, and generate the control signal according to the two pulse width modulation signals. When the loading of the buck-boost power converter transits from heavy to light, the frequency of the two ramp signals is decreased to improve the efficiency of the buck-boost power converter. The peaks and valleys of the two ramp signals may be adjusted by signals related to the input voltage and the output voltage.

The subject invention reveals a new coupled inductor boost converter which achieves zero voltage turn on switching for all four circuit switches. The coupled inductor of the circuit is fully clamped and thereby achieves excellent noise performance with neither snubbers nor clamps. The new coupled inductor boost converter is outstanding for isolated high voltage applications because the voltage stress of the secondary switches does not exceed the output voltage, it requires only one magnetic circuit element, and the average voltage stress of the secondary winding is equal to or less than half the output voltage.

The invention belongs to the technical field of power electronics, and particularly relates to a full-digital power factor correction circuit capable of carrying out switching frequency modulation. According to the technical scheme, the full-digital power factor correction circuit comprises a Boost power converter, a sampling/converting circuit and a control circuit, wherein the control circuit comprises a voltage loop compensation module, a numerical calculation module, a current loop compensation module, a pulse-width modulation (PWM) module, a switching frequency modulation (SFM) module and a gate drive module. The full-digital power factor correction circuit has the beneficial effects that load current of the Boost converter can be monitored in real time without the need of a current sampling circuit; the switching frequency can be adjusted according to the load change condition; the condition that a power factor correction (PFC) converter keeps working in a continuous conduction mode (CCM) under the light-load condition can be ensured; and the PFC converter can obtain a high power factor and low total harmonic distortion (THD) under the full-load condition.

This invention relates to an active power filter circuit of a three-phase commutation bridge applying impedance couple including: a capacitor, an inductor, four power switch tubes and an impedance network, in which, the impedance network is connected at the three input ends of the three-phase comutation bridge,two serial two-way boosting power converters composed of capacitors, inductors and four power switch tubes are parallel at the DC side of the commutation bridge. This invention is especially suitable for treatment of harmonic waves loaded by a three-phase commutation bridge.