24 results about "Current mode control" patented technology

An audio amplifier that implements current mode control without the use of an explicit or separate current mode sensor is disclosed. The audio amplifier may include a pair of feedback loops that provide current from a node located before an inductor of an output filter and current from a node located after the inductor of the output filter to an integrator circuit. The integrator circuit may be formed from existing circuitry of the audio amplifier controller. Thus, current mode control can be implemented without a separate current mode sensor. Further, the audio amplifier can be implemented as a half bridge or as a full bridge design without increasing the number of operational amplifiers compared to the half bridge.

A current mode controller for a switching converter is provided. The controller includes an error voltage generator for generating an error voltage dependent on an output voltage and a reference voltage; a current sensing module; an error amplifier; and a control signal generator. The current sensing module senses a current flowing through an energy storage element, receives the error voltage, and generates a slope compensated sensed current signal dependent on the sensed current and the error voltage. The error amplifier receives the error voltage, generates an amplified voltage error signal by applying a first amplification coefficient dependent on the error voltage to the error voltage. The control signal generator generates one or more control signals to control the switching operation of one or more power switches of the switching converter, each of the control signals being dependent on the slope compensated sensed current signal and the amplified voltage error signal.

A power controller and a control method for a power converter with soft turn-on and soft turn-off. The power converter includes an inductor element and a power switch for controlling an inductor current flowing through the inductor element. The power controller includes a voltage mode controller and a current mode controller. The voltage mode controller controls an on-time of the power switch based on a feedback signal and a sawtooth signal. The feedback signal is generated based on an output voltage of the power converter. The current mode controller controls the on-time based on a current limit signal and a current sense signal to limit the current sense signal. The current sense signal represents the inductor current. The current mode controller includes a limit signal generator for providing the current limit signal based on the feedback signal and a triangular wave signal and determining a soft turn-on time and a soft turn-off time. The limit signal generator increases the current limit signal over time during the soft turn-on time and decreases the current limit signal over time during the soft turn-off time.

This disclosure relates to a system (1400) comprising an input voltage node (1442) configured to provide an input voltage (VIN). The system (1400) also includes a load (R). LOAD A switching converter (1450, 1460) coupled between the input voltage node (1442) and the load (RLOAD). The switching converter (1450, 1460) is configured to provide an output voltage (VOUT) to the load (RLOAD) based on the input voltage (VIN). LOAD The switching converters (1450, 1460) include a gate driver circuitry (1430) and a current-mode control circuitry (1470) coupled to the gate driver circuitry (1430). The current-mode control circuitry (1470) is configured to output control signals to the gate driver circuitry (1430) according to different operating modes, wherein the current-mode control circuitry (1470) is configured to adjust a threshold (I) for switching between discontinuous conduction mode (DCM) and power-saving mode (PSM). PSM *).

This invention relates to the field of circuit control technology, specifically to a control method for a totem-pole PFC converter, comprising: controlling the operation of the totem-pole PFC converter based on a triangular current mode and obtaining the actual peak current; dynamically searching and locking the turn-off delay time during operation based on the actual peak current using a whale optimization algorithm; and correcting the PWM control signal of the totem-pole PFC converter based on the turn-off delay time. Addressing the problem of reduced control efficiency in existing totem-pole PFC converter circuits due to device turn-on and turn-off delays, this invention introduces a whale optimization algorithm to independently search for and determine the optimal turn-off delay time among the control parameters, and then uses this turn-off delay time to correct the control signal, thereby achieving better control efficiency optimization.

The invention discloses an intelligent operation regulation and control method and system for a motor under wide-area multiple working conditions, and relates to the technical field of motor control, and the method comprises the steps: obtaining a mode adjustment signal, determining a current mode control parameter and a target mode control parameter, and taking the current, voltage and temperature of the current collected motor as auxiliary parameters; constructing a control configuration module; the current mode control parameter, the target mode control parameter, the motor current, the voltage and the temperature serve as input, and a rotating speed adjusting instruction and a mode switching smoothing factor are obtained; and generating a speed regulation control signal according to the rotating speed regulation instruction and the mode switching smoothing factor, and performing motor mode rotating speed switching control. The technical problems that in the prior art, a motor control strategy is lack of intelligence and self-adaptability, and the motor rotating speed regulation and control accuracy is insufficient are solved, and the technical effects that motor intelligent control is achieved, speed regulation and control can be self-adaptively adjusted, and the motor rotating speed is precisely controlled are achieved.

An electronic motor drive for powering permanent magnet air core synchronous motors having sinusoidal back emf includes a switchmode power converter coupled to a connection of an input power supply. The power converter converts power from the input power supply with a current-mode control output and regulates current to a variable voltage link that supplies the regulated current to a non-modulating commutation inverter that energizes multi-phase air core armature windings of the air core motor. The motor drive employs 6-step position sensorless commutation exciting only two phase legs at a time controlled through measurement of the back emf. The switchmode power converter includes a low pass inductance and capacitance filter ahead of a power supply of the commutation inverter. The regulated current is switched at a regulation frequency high enough to preclude significant switching-induced harmonic ripple currents to the air core armature windings.

The invention discloses a step-down DC-DC converter with high input and low ripples, which relates to the technical field of integrated circuits, and is characterized in that compared with a traditional filter circuit, an RC filter and a coupling capacitor are additionally arranged at an inductor, so that the output ripples can be better reduced; meanwhile, a P tube and an N tube are matched for use in the switch tube, so that the whole circuit does not need to adopt an additional level shift circuit, and meanwhile, a bootstrap circuit does not need to be added to drive the switch tube during high-voltage input. Moreover, aiming at a current sampling circuit in current mode control, the invention also provides a sampling circuit in which two groups of sampling circuits are matched, so that the obtained sampling current is more accurate.

AC control systems, devices and methods which can, for instance drive a power converter coupled to drive electric machines (e.g., electric motors) advantageously employs an AC controller that implements current mode control utilizing an average current controller in conjunction with and an AC peak current controller with high bandwidth. Such can advantageously employ a fixed switching frequency, and utilize a zero vector to generate the same DC link ripple current as would be generated using field orientated control (FOC) with space vector modulation (SVM).

To realize an inexpensive yet high-performance AC / DC converter. [Solution] This AC / DC converter 6 performs bidirectional conversion including a bridgeless PFC circuit 20. The PFC circuit 20 has a linkage switch 30 that switches the presence or absence of AC eac input on and off. The controller 14 has a peak current control unit 60 that performs peak current mode control and an AC tuning control unit 80 that matches the phase and period of the input voltage einv to AC eac and gradually increases the amplitude of the input voltage einv to match the amplitude of AC eac. When the AC tuning control unit 80 is activated at startup, and when the amplitude of the input voltage einv reaches a predetermined value, the linkage switch 30 switches from off to on, and the system switches to peak current mode control.

Described embodiments include a voltage regulator circuit with an amplifier having inputs coupled to a feedback voltage terminal and a reference voltage terminal. A comparator has a first comparator input coupled to the amplifier output, a second comparator input and a comparator output. A current sense circuit provides a current sense output proportional to an output current. A waveform generator is coupled between the second comparator input and ground. A first latch input is coupled to the comparator output. A clock generator is coupled between a second latch input and ground. A clamp circuit has a first clamp input coupled to the current sense output, a second clamp input coupled to a fixed voltage source, and a clamp output coupled to the first comparator input. The clamp circuit limits the first comparator input voltage to a clamp voltage that varies responsive to the current sense output.

A control unit for operating a switched power converter is provided. The control unit is configured to provide an output voltage at an output node in dependence of an input voltage at an input node using a switching network which is configured to operate an inductance in a first state and in a second state is described. The current through the inductance exhibits a first slope in the first state and a second slope in the second state. The control unit is configured to generate a first reference, to determine slope information, to determine a hysteretic offset and a ramp slope of a ramp signal based on the slope information, to generate a second reference based on the first reference, to provide a current signal which is indicative of the current through the inductance, and to cause the switching network to put the inductance into the first state.

The fixed-frequency peak current mode control slope compensation circuit and the switching circuit provided by the embodiments of the present disclosure, the current detection module collects the switching node voltage, and outputs a first voltage according to the switching node voltage and the input node voltage during the conduction of the upper power tube, and outputs a second voltage according to the switching node voltage and the ground node voltage during the conduction of the lower power tube; the slope detection module determines a third voltage corresponding to the slope of the change amount of the conduction current of the lower power tube according to the first voltage and the second voltage; the sample and hold module samples the third voltage during the conduction of the lower power tube, holds and outputs a fourth voltage of the third voltage at the time before the conduction of the upper power tube during the conduction of the upper power tube; the slope compensation module generates a slope compensation voltage corresponding to the fourth voltage according to the fourth voltage, and generates a ripple voltage according to the slope compensation voltage and the first voltage; and the duty cycle modulation module generates a duty cycle signal according to the ripple voltage and an error voltage.

The utility model relates to the technical field of digital power supply control, in particular to a slope compensation circuit. The main control unit is connected with the MCU and the DCDC power supply; comprising a power supply unit, a first slope compensation unit, a second slope compensation unit, an input interface A and an output interface B, a first external slope compensation unit and a second external slope compensation unit are added during current mode control of the digital switching power supply, so that control can be better realized, subharmonic oscillation is avoided, and external slope compensation is more stable and higher in linearity than internal slope compensation; and more flexible slope compensation is realized through matching with a driving signal given by the MCU unit.

This allows for miniaturization of the reactor and enables constant control of the DC bus voltage. [Solution] The AC / DC converter 6 is equipped with a converter mechanism 13 including a bridgeless PFC circuit 20 and performs a boost operation to perform unidirectional conversion. The bridgeless PFC circuit 20 has a first switching element S1 and a second switching element S2 whose switching operation is performed by a controller 14 according to the polarity of the input voltage. The controller 14 has a peak current control unit 80 that performs peak current mode control and outputs control signals to turn the first switching element S1 and the second switching element S2 on and off. By interposing a limiter 90 between the DC bus voltage control unit 60 and the peak current command value setting unit 70, the command value Iinv of the reactor current is set * Restrict.

The invention relates to dynamic compensation clamping for current mode control. Described embodiments include a voltage regulator circuit (400) having an amplifier (134) having an input coupled to a feedback voltage terminal (133) and a reference voltage terminal (138). A comparator (112) has a first comparator input coupled to the amplifier output, a second comparator input, and a comparator output. A current sense circuit (118) is coupled between an output voltage terminal and the second comparator input and provides a voltage proportional to the output current at a current sense output. A waveform generator (116) is coupled between the second comparator input and ground. A first latch input (108R) is coupled to the comparator output. A clock generator (114) is coupled between the second latch input and ground.

A control unit for operating a switching power converter is provided. The control unit is configured to provide an output voltage at an output node as a function of an input voltage at an input node, using a switching network configured to operate an inductor in a first state and a second state, as described. The current through the inductor exhibits a first slope in the first state and a second slope in the second state.The control unit is configured to generate a first reference, determine slope information, determine a hysteresis offset and ramp slope of a ramp signal based on the slope information, generate a second reference based on the first reference, provide a current signal indicating the current through the inductor, and cause the switching network to move the inductor to the first state.

The application discloses a current stress control method of three-phase four-wire PFC in single-phase mode, which is based on split capacitor three-phase four-wire PFC circuit topology structure, and A phase and B phase in the topology are staggered and connected in parallel as an input port, C phase and N line are staggered and connected in parallel as another input port, voltage mode control is adopted for A phase and B phase to adjust grid-side alternating current and bus DC voltage, current mode control is adopted for C phase to adjust C phase current, current distribution coefficient is set to distribute the current of C phase and N line, three-phase control signals are obtained, comparison with high-frequency carrier is carried out to generate PWM driving signals, and the current stress control of three-phase four-wire PFC in single-phase mode is realized. The application can realize power factor correction and bus DC voltage stabilization, can distribute the current of C phase and N line, and can use power devices with low current level to realize higher power level.

This disclosure relates to a current-mode controller. A current-mode controller for a switching converter is provided. The controller includes: an error voltage generator for generating an error voltage dependent on an output voltage and a reference voltage; a current sensing module; an error amplifier; and a control signal generator. The current sensing module senses a current flowing through an energy storage element, receives the error voltage, and generates a slope-compensated sensed current signal dependent on the sensed current and the error voltage. The error amplifier receives the error voltage and generates an amplified voltage error signal by applying a first amplification factor dependent on the error voltage to the error voltage. The control signal generator generates one or more control signals to control the switching operation of one or more power switches of the switching converter, each control signal depending on the slope-compensated sensed current signal and the amplified voltage error signal.

The invention discloses a trapezoidal wave current mode control method for a dual three-level Buck-Boost converter. The trapezoidal wave current mode control method comprises the following steps: sampling input and output voltage, flying or cascade capacitor voltage and inductive current; dividing three working intervals, and calculating an inductive current average value, a switching frequency and a capacitance voltage unbalance amount; establishing a function relationship among the duty ratio, the switching frequency, the input / output voltage and the inductance average current; variable duty ratio control is carried out within a duty ratio limit value, trapezoidal wave current and bidirectional power transmission are realized, and zero-voltage conduction of a switching tube is ensured; when the duty ratio reaches or exceeds a set limit value, the control mode is automatically switched to a variable duty ratio and variable frequency hybrid control mode, and trapezoidal wave current, zero voltage conduction and bidirectional power transmission performance are maintained by synchronously adjusting the switching frequency and the duty ratio. The problems of large peak current, high switching loss and low efficiency in a traditional hard switching mode are solved.

A multi-phase control system is disclosed. The multi-phase control system includes a current mode control circuit and a pulse distributor configured to distribute a first set of pulses to a first power stage and a second set of pulses to a second power stage, and to selectively activate or deactivate the second set of pulses to the second power stage based on the load condition.The multiphase control further includes a current sensing circuit which is coupled to receive a multitude of current monitoring signals from the multitude of power stages and is configured to provide a summing signal to the current mode control circuit based on the multitude of current monitoring signals and to use a first current monitoring signal from the first power stage instead of a second current monitoring signal from the second power stage for a replacement period after a resumption of the second set of pulses to the second power stage.

The invention discloses a multi-path interlaced inductive coupling bidirectional four-switch BUCKBOOST circuit, the inductor is a coupling inductor of an A four-switch buck-boost full-bridge unit and a B four-switch buck-boost full-bridge unit, through the coupling design of the A four-switch buck-boost full-bridge unit, the B four-switch buck-boost full-bridge unit and the inductor, specific electric energy conversion and transmission functions can be realized, and the multi-path interlaced inductive coupling bidirectional four-switch BUCKBOOST circuit can be used for realizing the multi-path interlaced inductive coupling bidirectional four-switch BUCKBOOST circuit. And the shunting effect of double-path current of the four-switch buck-boost full-bridge unit A and the four-switch buck-boost full-bridge unit B enables each path of current to be halved, so that the coil copper loss of the inductor is reduced, and the magnetic loss of a magnetic element can be reduced. In addition, when four switches A and four switches B adopt quadrilateral current mode control and frequency conversion modes, a brand new interleaving control strategy is adopted, switching loss can be reduced, and input and output ripples are reduced.

A control unit for operating a switching power converter is provided. The control unit is configured to provide an output voltage at an output node in accordance with an input voltage of an input node using a switching network configured to operate the inductor in a first state and a second state. The current flowing through the inductor presents a first slope in a first state and presents a second slope in a second state. The control unit is configured to generate a first reference value, determine slope information, determine a hysteresis offset and a ramp slope of the ramp signal based on the slope information, generate a second reference value based on the first reference value, provide a current signal indicative of a current flowing through the inductor, and cause the switching network to place the inductor in a first state.

The present invention provides a power conversion system that enables highly efficient power transmission over a wide voltage range, while simultaneously achieving both stable power control and responsiveness. [Solution] The control device 106a controls the phase of the drive pulse edge to control the period during which both the primary and secondary AC voltages of the isolation transformer 102 are at zero voltage, or controls the phase of the drive pulse edge to control the period δ during which the primary and secondary AC voltages of the isolation transformer 102 are at opposite polarity, according to the magnitude of the control variable D. At that time, the power or current transmitted through the isolation DC / DC converter changes linearly with respect to the input control variable over the entire range including the control range of the discontinuous current mode and the control range of the continuous current mode. Input control variables A transformation is applied to generate control variables.