42 results about "Buck power converter" patented technology

A three phase buck power converter having input power control is described. The power converter uses a three input buck converter comprising switches for each phase, a catch rectifier, an inductor and an output capacitor. The duty cycle of the three switches is constrained to have a sine function relationship that may be derived from the input voltage wave form or from a reference oscillator. When so constrained, the input currents have high power factor. The output is a precise, high quality dc voltage, comparable to the output of a dc—dc buck converter, and the dynamic response is comparable. Voltage mode and current mode controls are shown, as is a precise line regulation feed forward for the voltage mode embodiment. The three phase buck power converter may be operated in reverse as a three phase boost converter, as they are reciprocal. A three phase ac—ac converter may have a three phase buck converter as its input and a three phase boost converter as its output.

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 current sense and feedback circuit is provided for a non-isolated Buck power converter to maintain constant current load regulation. The Buck converter may have a high side power switch and may include an input port, a switcher unit including a switch and a controller, an inductor coupled to the output, and a freewheeling diode for circulating the inductor current when the switch is open. The simplified current sense and feedback circuit of the power converter may include a current sense resistor module coupled to the freewheeling diode to provide a sense signal to the controller. The controller may also be coupled to the output of the power converter to sense an over voltage condition. The simplified current sense and feedback circuit may provide output regulation while maintaining a low component count, small size, and low loss that makes the power converter suitable for use in compact design applications.

A novel switching hysteretic bidirectional power converter is presented. The converter includes the generation of a synthetic ripple signal and feedback networks to hysteretically control the power converter both when the converter operates as a boost converter with the flow of power in one direction, and when the converter operates as a buck power converter with the flow of power in the opposite direction.

The presented approach provides a switching converter with a much simpler control method with respect to conventional inductive bidirectional power converters. The hysteretic control provides stable operation in all conditions with excellent load and line transient response. Furthermore this allows the operation of the bidirectional power converter with much higher switching frequencies with respect to state of the art conventional approaches, thus reducing the cost and size of the passive components storing energy during the conversion.

Since bidirectional switching power converters are used mainly when the flow of power is bidirectional, the typical application involves the charging and discharging of batteries, and as part of this novel approach, an hysteretic battery charger including hysteretic constant current and constant voltage control is introduced as part of a larger bidirectional switching power converter.

A DC-DC buck converter in multi-die package is proposed having an output inductor, a low-side Schottky diode and a high-side vertical MOSFET controlled by a power regulating controller (PRC). The multi-die package includes a first die pad with the Schottky diode placed there on side by side with the vertical MOSFET. The PRC die is attached atop the first die pad via an insulating die bond. Alternatively, the first die pad is grounded. The vertical MOSFET is a top drain N-channel FET, the substrate of Schottky diode die is its anode. The Schottky diode and the vertical MOSFET are stacked atop the first die pad. The PRC is attached atop the first die pad via a conductive die bond. The Schottky diode die can be supplied in a flip-chip configuration with cathode being its substrate. Alternatively, the Schottky diode is supplied with anode being its substrate without the flip-chip configuration.

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 discloses an oscillator which comprises a voltage division circuit, a charging resistance, a capacitance, a comparator circuit and a discharging circuit. The voltage division circuit is connected with a power source and provides a divided voltage reflecting the voltage of the power source; the power source charges the capacitance by the charging resistance; the comparator circuit compares the voltage drop of the capacitance and the divided voltage; when the voltage drop of the capacitance is higher than or equal to the divided voltage, the comparator circuit outputs a discharge control signal to control the discharging circuit to discharge the capacitance; when the voltage drop of the capacitance is lower than the divided voltage, the comparator circuit outputs a non-discharge control signal to control the discharging circuit to stop discharging the capacitance; thus the oscillator generates a oscillator signal, the amplitude of which is in proportion to the power source voltage.

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.

The invention discloses a method for generating saw tooth wave signals in a boost-buck power supply converter. The boost-buck power supply converter is used for converting an input voltage into an output voltage. The method is characterized by comprising the following steps of: 1, detecting the input voltage; and 2, providing a first saw tooth wave signal and a second saw tooth wave signal according to the input voltage, wherein the peak value of the first saw tooth wave signal is changed together with the input voltage, and the valley value of the second saw tooth wave signal is changed together with the input voltage. A saw tooth wave generator of the boost-buck power supply converter and the saw tooth wave signal generating method have the advantage of quickly responding to stabilize the output voltage when the input voltage is changed.

In a switched-mode buck power converter, superior regulation with excellent transient response is provided when per-cycle energy demand is determined and balanced with per-cycle inductive energy supply to control per-cycle inductive energy charging. Such per cycle inductive energy calculation is improved through the prediction of pedestal energy during operating periods of Continuous Conduction Mode (CCM). Further, recovery from severe transients sometimes straddles multiple chopping cycles. Such recovery is best obtained by preserving energy balance information from one or more un-recovered chopping cycles, to be used to restore energy balance in subsequent cycles. Significant improvement over prior art converters may be obtained even when the energy balance data used for control and recovery are imprecise approximations of true energy demand and supply.

This invention provides control circuitry and a method for using energy balance information to better control a buck converter, with the further improvements of pedestal energy prediction and extension of energy balance over multiple chopping cycles, and for using said circuitry and methods to maintain stability and recover from transients more reliably than in the prior art.

A buck power converter includes a power transistor, an inductor, a first diode, and an anti-ringing circuit. The power transistor has a first terminal, a second terminal, and a control terminal. The first terminal of the power transistor receives an input voltage, and the control terminal of the power transistor receives a pulse width modulation (PWM) signal. The anti-ringing circuit detects a detection voltage on the second terminal of the power transistor. According to the detection voltage, the anti-ringing circuit provides at least one second diode serially coupled between the second terminal of the power transistor and a reference ground terminal in a forward-biased manner, so as to clamp a voltage swing of the detection voltage.

A buck power converter creates a desired output voltage from a greater input voltage with higher efficiency than linear regulators or charge pumps. For compact-size and cost sensitive products, the use of the buck power converter is hindered mainly because of lack of physical space and increases in the cost of the passive components like the inductor and capacitor. Techniques are presented to reduce the sizes of the passive components so that they can be integrated on-chip or in-package or on board. A signal converter in the buck power converter determines the duty cycle of a switching control signal. The switching control signal would ordinarily have driven a power switching circuit that provides current to the inductor in the buck power converter. The signal converter outputs a modified (multiphase) switching control signal that includes multiple separated on-periods that taken together approximate the duty cycle of the switching control signal while maintaining the same control loop frequency. The multiphase switching signal drives the power switching circuit to provide current to the inductor during each of the multiple separated on-periods so that the output voltage ripple decreases by a factor of the number of phases in the modified switching signal. In this way, if the ripple amplitude is kept same, the sizes of the passive components can be reduced by the factor of the number of phases in the modified switching control signal.

The invention discloses a method for improving the interactive interference of a buck power converter. The power converter comprises a first switching stage and a second switching stage, wherein the first switching stage converts an input voltage into a first output voltage, and the second switching stage converts the first output voltage into a second output voltage. The method is characterized in that the method comprises the following steps: 1. according to a reference voltage and a feedback voltage, producing an error signal, wherein the feedback voltage is the function of the second output voltage; and 2. producing a forward feed signal to the first switching stage from the error signal so as to stabilize the first output voltage. In the invention, the buck power converter capable of improving interactive interference and the method thereof have the advantage of improving the interactive interference between the output ends of the power supplies.

The invention provides a buck power converter, which is used for converting a power input voltage into a power output voltage. The buck power converter comprises a first rectifier filter circuit and a power integrated circuit. The first rectifier filter circuit is used for carrying out rectification and filtering on an output intermediate voltage and converting the output intermediate voltage into a power output voltage; and the power integrated circuit is used for converting the power output voltage into the output intermediate voltage. Besides, the power integrated circuit comprises a voltage output pin and a second rectifier filter circuit. The voltage output pin is used for outputting the output intermediate voltage; and the second rectifier filter circuit, which is coupled with the voltage output pin, is used for carrying out rectification and filtering on the output intermediate voltage so as to convert the output intermediate voltage into a detection voltage, wherein the detection voltage is the same as the power output voltage.

The invention discloses a robust control method and control system of a direct-current buck converter, and a direct-current buck power converter. The method comprises the following steps: S1, acquiring voltage at two ends of a capacitor of a converter and current flowing through the inductor of the converter; S2, respectively calculating values z1(k) and z2(k) of error variables z1 and z2 at a moment k according to the obtained voltage and current; and S3, setting the duty ratio of the on-off control signal of the switching tube of the converter as an actual control variable u, obtaining the value u(k) of the actual control variable u at the moment k, setting the duty ratio of the on-off control signal of the switching tube of the converter as u(k), and returning to S1. According to the invention, the control method can effectively solve the problem of bus voltage oscillation caused by non-linear change of the load so as to stabilize the power supply voltage, the calculated amount is small, the algorithm is simple and easy to understand, robust control is achieved through the combination of the first inequality and the second inequality and the backstepping method, items needing tobe amplified are amplified slightly, and output oscillation is small.

A switch controller for a variable output voltage power converter includes a pulse width modulator (PWM) output producing a pulsed signal for driving a power converter switch. A mode selector output is connected to a multiplier. A period selector output is connected to the multiplier and to a PWM input. The multiplier output is connected to another PWM input. A comparator output is connected to a period selector input. The period selector outputs a nominal cycle time to the PWM when an operating on-time state is greater than a minimum operating on-time. The period selector outputs an updated cycle time greater than the nominal cycle time when the operating on-time state is less than the minimum operating on-time causing the PWM to output a pulsed signal with the updated cycle time and a duty cycle equal to a duty cycle of an immediately preceding pulsed signal.