92results about How to "Reduce ripple voltage" patented technology

A switching power supply device for a ripple control system that can obtain the ripple component with the necessary amplitude without using discrete elements. On capacitor Ci of CR integrator 11, a voltage is generated corresponding to the integration value of the voltage applied to inductor Lo. The ripple voltage generated on capacitor Ci has a waveform similar to that of the ripple current flowing through inductor Lo. The voltage of capacitor Ci is converted into current Iq by voltage / current converter 12, and the current is injected in resistor R3 arranged on the transmission path of output feedback voltage VFB in comparator 2. Resistor R3 generates ripple voltage (Iqxr3) corresponding to the ripple current flowing through inductor Lo. The synthetic voltage of the ripple voltage and output feedback voltage VFB is compared to reference voltage Vref.

DC link capacitance in a bi-directional AC / DC power converter using a full-bridge or H-bridge switching circuit can be greatly reduced and the power density of the power converter correspondingly increased by inclusion of a bi-directional synchronous rectifier (SR) DC / DC converter as a second stage of the power converter and controlling the second stage with a control loop having a transfer function common to both buck and boost modes of operation of the bi-directional SR DC / DC converter and a resonant transfer function to increase gain at the ripple voltage frequency (twice the AC line frequency) to control the duty cycle of the switches of the bi-directional SR DC / DC stage and controlling the duty cycle of the switches of the full-bridge or H-bridge switching circuit using a control loop including a notch filter at the ripple voltage frequency.

To provide a power supply unit capable of realizing a multiphase power supply at low cost. For example, each of a plurality of semiconductor devices DEV[1]-DEV[n] comprises a trigger input terminal TRG_IN, a trigger output terminal TRG_OUT, and a timer circuit TM that delays a pulse signal input from TRG_IN and outputs it to TRG_OUT. DEV[1]-DEV[n] are mutually coupled in a ring shape by its own TRG_IN being coupled to TRG_OUT of one semiconductor device other than itself. Each of DEV[1]-DEV[n] performs switching operation by using the pulse signal from TRG_IN as a starting point, and feeds a current into an inductor L corresponding to itself. Moreover, DEV[1] generates the above-described pulse signal only once during startup by a start trigger terminal ST being set to a ground voltage GND, for example.

Provided is a PWM switching regulator control circuit, which is small in the ripple voltage without a drop of the output voltage which, is attributable to a load at the time of a soft start. A PWM switching regulator control circuit is provided, in which an offset voltage that is lower than a reference voltage is inputted to an error amplifier at the time of a soft start, to thereby prevent an off-time from occurring in the PWM comparator output, prevent the output voltage that is attributable to the load from dropping, and make the ripple voltage small.

The invention provides a low drop-out linear regulated power supply without an off-chip capacitor. The low drop-out linear regulated power supply comprises an error amplifier, a power tube output branch, a high-pass filtering network, a first charging and discharging circuit, a second charging and discharging circuit and a buffer at least, wherein the power tube output branch is connected with the error amplifier; the high-pass filtering network is used for regulating the driving capability of the error amplifier based on changes of the output voltage of the power tube output branch; the first charging and discharging circuit is used for being connected with a gate capacitor of a power tube to form a first charging and discharging path based on ripples in the output voltage of the power tube output branch, and the power tube output branch comprises the power tube; the second charging and discharging circuit is used for being connected with a gate capacitor of the power tube to form a second charging and discharging path based on transient jumps of the output voltage of the power tube output branch, the power tube output branch comprises the power tube; the buffer is connected with the power tube output branch. The low drop-out linear regulated power supply not only achieves stability in a full-load range, but also can achieve a low ripple voltage and rapid recovery capability under the circumstance of heavy-load current jumps.

An armature winding is constructed by connecting an a-phase winding phase portion, a b-phase winding phase portion, a c-phase winding phase portion, a d-phase winding phase portion, and an e-phase winding phase portion into an annular shape so as to have a phase difference corresponding to an electrical angle of 72 degrees from each other. A rectifier is constituted by a five-phase full-wave rectifier formed by connecting in parallel five pairs of diodes connected in series. Output wires of the armature winding are connected to respective connection points of diodes connected in series on the rectifier.

A single-stage isolated high power factor AC / DC converter with a leakage inductor energy recovery function includes a buck-boost circuit, for step-down or step-down a power supply; a transformer, electrically connected to the buck-boost circuit, for transforming the stepped-down or stepped-up power supply; a switch, electrically connected to the buck-boost circuit; an input capacitor, electrically connected to the buck-boost circuit; and an output circuit, for outputting the power supply transformed by the transformer. When the switch is cut off, the buck-boost circuit provides an energy recovery path to return energy stored in a leakage inductor of the transformer to the input capacitor. The energy stored in the leakage inductor of the transformer in a flyback converter or a forward converter is returned to the input capacitor through the energy recovery path. The problem caused by the leakage inductor of the transformer is solved without using any additional element.

A DC-DC converter is structured such that a main switching element has one terminal connected to one terminal of a DC power supply and has the other terminal connected to one terminal of a first winding of a resonance coil, a choke coil has one terminal connected to one terminal of a second winding of the resonance coil and has the other terminal connected to one terminal of an output capacitor, a rectifier diode has one terminal connected to the connection of the first and second windings and has the other terminal connected to the other terminal of the output capacitor and also to the other terminal of the DC power supply, and a series circuit including an auxiliary switching element and a clamping capacitor is provided between the other terminal of the DC power supply and the connection of the main switching element and the first winding.

DC link capacitance in a bi-directional AC / DC power converter using a full-bridge or H-bridge switching circuit can be greatly reduced and the power density of the power converter correspondingly increased by inclusion of a bi-directional synchronous rectifier (SR) DC / DC converter as a second stage of the power converter and controlling the second stage with a control loop having a transfer function common to both buck and boost modes of operation of the bi-directional SR DC / DC converter and a resonant transfer function to increase gain at the ripple voltage frequency (twice the AC line frequency) to control the duty cycle of the switches of the bi-directional SR DC / DC stage and controlling the duty cycle of the switches of the full-bridge or H-bridge switching circuit using a control loop including a notch filter at the ripple voltage frequency.

A PWM / PFM control circuit has a differential time generating means for forming a differential time signal representing a differential time corresponding to a difference between the pulse width of a PWM control signal and the pulse width of a PFM control signal on condition that the pulse width of the PWM control signal is smaller than the pulse width of the PFM control signal, and the oscillation frequency of a reference signal serving as a reference for forming the PWM control signal is controlled based on the differential time signal to a low value in accordance with the differential time.

A method and apparatus for providing a clock signal to a charge pump is disclosed. In a particular embodiment, the method includes providing a first clock signal to a first charge pump unit of a charge pump. The method further includes providing a second clock signal to a second charge pump unit of the charge pump. A low-to-high transition of the first clock signal occurs substantially concurrently with a high-to-low transition of the second clock signal. Only one clock signal may be at a logic high voltage level at any given time.

A rectifier circuit includes: a switching circuit having an input end, an output terminal and a control end, wherein the input end of the switching circuit receives an input voltage; a control circuit electrically connected to the control end of the switching circuit, wherein, when a load current is smaller than a reference current, the rectifier circuit is situated at a light-load state and the control circuit reduces a switching frequency of the switching circuit; and a filtering circuit which is electrically connected between the output end of the switching circuit and an output terminal of the rectifier circuit, and includes at least one inductive component of which a current is formed by superposition of the load current and a ripple current, wherein, when the load current is smaller than the reference current, an inductance of the inductive component increases with the decrease of the load current.

A DC-DC converter is structured such that a main switching element has one terminal connected to one terminal of a DC power supply and has the other terminal connected to one terminal of a first winding of a resonance coil, a choke coil has one terminal connected to one terminal of a second winding of the resonance coil and has the other terminal connected to one terminal of an output capacitor, a rectifier diode has one terminal connected to the connection of the first and second windings and has the other terminal connected to the other terminal of the output capacitor and also to the other terminal of the DC power supply, and a series circuit including an auxiliary switching element and a clamping capacitor is provided between the other terminal of the DC power supply and the connection of the main switching element and the first winding.

A PWM / PFM control circuit has a differential time generating means for forming a differential time signal representing a differential time corresponding to a difference between the pulse width of a PWM control signal and the pulse width of a PFM control signal on condition that the pulse width of the PWM control signal is smaller than the pulse width of the PFM control signal, and the oscillation frequency of a reference signal serving as a reference for forming the PWM control signal is controlled based on the differential time signal to a low value in accordance with the differential time.

A selector sets respective phases of pulse driving signals in reverse when a proportion signal or integration signal does not exceed a threshold. Shifting the respective phases of the pulse driving signals from each other lowers the ripple voltage. When the load current increases drastically, the output voltage Vo tends to decrease remarkably because of the shortage of capacity in the power supply. In this case, when the proportion signal or integration signal exceeds its corresponding threshold, a phase control unit causes the pulse driving signals to synchronize their phases, i.e., the selector supplies the same ramp wave to the comparators, so that respective output voltages supplied from the DC voltage converter circuits attain the same phase, thereby restraining the output voltage supplied to the load from decreasing remarkably.

The invention provides a control system and a control method for a frequency interpolation pattern cascading off-line PFC-PWM switch power converter. An PFC module converts an AC voltage to a DC voltage; a control signal of a first switch block of a PFC module is generated by a PFC control signal generation module; the input current of the PFC module is adjusted and the DC voltage output by a first capacitor is steadily kept at the set value; a PWM module converts the output voltage of the PFC module to the output voltage of the control system; a control signal of a second switch block is generated by a frequency interpolation pattern PWM control signal generation module, so that the output voltage of the control system reaches the set DC voltage value; when the first capacitor is charged, the second capacitor is charged at intervals. The invention has the advantages of improving the frequency feature of the DC-DC part, reducing the ripple voltage of the capacitor and the cost, and improving the power factor adjusting coefficients of the cascading off-line PFC-PWM switch power converter.

The present invention relates to a resonant DC-DC power converter assembly comprising a first resonant DC-DC power converter and a second resonant DC-DC power converter having identical circuit topologies. A first inductor of the first resonant DC-DC power converter and a second inductor of the second resonant DC-DC power converter are configured for magnetically coupling the first and second resonant DC-DC power converters to each other to forcing substantially 180 degrees phase shift, or forcing substantially 0 degree phase shift, between corresponding resonant voltage waveforms of the first and second resonant DC-DC power converters. The first and second inductors are corresponding components of the first and second resonant DC-DC power converters.

The invention describes a switching power supply system for automatically regulating an operating frequency and the method. The switching power supply system has a sensing and monitoring unit connected to the computer system for detecting the operating status of the computer system and outputting a detection value, a setting unit for setting a trigger condition value, a storage unit connected to the setting unit for storing the trigger condition value, a comparator unit connected to the storage unit and the sensing and monitoring unit for comparing the detection value with the trigger condition value and outputting a comparison result signal, and a PWM switching frequency regulator unit connected to the comparator unit and the converter for receiving the comparison result signal and regulating the operating frequency of the pulse width modulation so that a converter can supply power to the computer system more efficiently.

The invention discloses an unmanned aerial vehicle flight controller attitude calculation and control method. The attitude calculation method includes a first attitude matrix obtained by fusing an accelerometer with a magnetometer, a second attitude matrix obtained by fusing a gyroscope and a third attitude matrix of the previous control period, and a third attitude matrix including high-precision attitude information obtained by fusing the first attitude matrix and the second attitude matrix. The attitude control method takes the attitude space vector as the control object, obtains the control quantity of each motor according to the third attitude matrix, and realizes the attitude control of the unmanned aerial vehicle. The attitude calculation and control method can be applied to the control of all the attitudes of the unmanned aerial vehicle, and is high in real-timeness and stable in attitude calculation and control.

In order to provide a switching regulator having high efficiency even under light load, the switching regulator is configured so that ON / OFF of a switching element is controlled by an output signal of an oscillation circuit having an oscillation frequency controlled by an output signal from an error amplifier. Thereby, the oscillation frequency can be suppressed under light load, thus reducing a switching loss.

A power supply system for reducing input ripple voltage, the system including: a first switching regulator having at least two input pins, one input pin being a voltage input pin and another input pin being a synchronization input pin; a second switching regulator having at least two input pins, one input pin being a voltage input pin and another input pin being a synchronization input pin; wherein outputs of the first switching regulator and the second switching regulator are connected to a power bus; a first delay element connected to the synchronization input pin of the first switching regulator; a second delay element connected to the synchronization input pin of the second switching regulator; wherein the first delay element and the second delay element have different delays, the first switching regulator and second switching regulator operating out of phase; and a master clock for providing timing control to the first and second delay elements.

A charge pump circuit (1) comprising first and second rectification elements (10, 11) connected in series between an input terminal (7) and an output terminal (9) and outputting a predetermined voltage from the output terminal (9) when charges are moved sequentially through these rectification elements (10, 11) and stored in an output capacitor (12). The charge pump circuit (1) further comprises an integrator (15) for integrating the difference between a feedback voltage from the output terminal (9) and a reference voltage, a boost capacitor (17) having one end thereof connected with the joint point between the first and second rectification elements (10, 11), and a clock reverser (16) having power supply side and ground side transistors (30, 31) being inputted with a clock signal (CLK) and a variable current source (32) for feeding a current dependent on the output voltage from the integrator (15) to any one of the transistors, and having its output connected with the other end of the boost capacitor (17).

The invention describes a switching power supply system for automatically regulating an operating frequency and the method. The switching power supply system has a sensing and monitoring unit connected to the computer system for detecting the operating status of the computer system and outputting a detection value, a setting unit for setting a trigger condition value, a storage unit connected to the setting unit for storing the trigger condition value, a comparator unit connected to the storage unit and the sensing and monitoring unit for comparing the detection value with the trigger condition value and outputting a comparison result signal, and a PWM switching frequency regulator unit connected to the comparator unit and the converter for receiving the comparison result signal and regulating the operating frequency of the pulse width modulation so that a converter can supply power to the computer system more efficiently.

A step-up DC-DC converter has a switching element for feeding current to an inductor; a rectifier connected to the output side of the inductor; and a control circuit performing on / off control of the switching element, based on an output voltage and a voltage corresponded to the inductor current. The control circuit further has a first voltage comparator circuit detecting fall of the output voltage down to the first reference voltage; a second voltage comparator circuit detecting that the inductor current reached a predetermined current value; and a voltage generation circuit generating a voltage inversely proportional to an input voltage and feeds the voltage, as a second reference voltage, to the second voltage comparator circuit. The switching element turns on, when the output voltage fell down to the first reference voltage, whereas the switching element turns off, when voltage proportional to the inductor current rose up to the second reference voltage.

The invention provides a charge pump circuit. The charge pump circuit comprises a group of differential complementary metal-oxide-semiconductor (MOS) switch circuits, a reference voltage negative feedback circuit, a group of N-channel metal-oxide-semiconductor (NMOS) current mirrors and a group of P-channel metal-oxide-semiconductor (PMOS) current mirrors, wherein the group of NMOS current mirrors and the group of PMOS current mirrors are respectively connected to the differential complementary MOS switch circuits and the reference voltage negative feedback circuit for providing mirror currents; and the reference voltage negative feedback circuit is connected with differential complementary MOS switches, so that the reference voltage negative feedback circuit provides feedback for the differential complementary MOS switches. Currents flowing through two groups of complementary differential MOS switches are completely matched through the feedback action of the reference voltage negative feedback circuit on the differential complementary MOS switches, so that the ripple voltage generated at an output voltage end due to unmatched current sources is effectively reduced, and the output noise performance of a phase locked loop is greatly improved.

The invention relates to the field of voltage stabilized power supply, in particular to a high-power wide-range adjustable DC linear regulated power supply, which includes a switching power input circuit, an auxiliary switch power supply circuit, the power factor compensation boost circuit, the isolated power conversion circuit of the switching power supply, the voltage and current controllable BUCK circuit and the load voltage and current display circuit. By the cooperatively connected circuit modules, the invention solves the problems of narrow voltage regulation range, small power and bulkyof the existing DC linear voltage stabilized power supply.