54 results about "Current mode control" patented technology

A controller includes a current-mode control device configured to determine a turn-on edge of a first gate-drive signal, an on-time timer that includes a first ramp generator having a first current source, a first capacitor, and a first ramp-generation switch, the first ramp generator configured to generate a first ramp signal, and a first logic circuit having an output coupled to a control terminal of the first ramp-generation switch, the first logic circuit configured to control the first ramp-generation switch based at least in part on the first gate-drive signal and on a feedback signal received from the current-mode control device, thereby resetting the first ramp signal, wherein the on-time timer is further configured to determine a turn-off edge of the first gate-drive signal by comparing the first ramp signal with a first threshold voltage that is proportional to an output voltage of the power converter.

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.

The application discloses a fast transient response Buck converter based on AOT control, compatible with the advantages of current mode control and AOT control, an error amplifier is added in a negative feedback control loop, the precision of an output voltage is improved, a current loop is stable, and there is no specific restriction on the series resistance value of an output capacitor; the improved adaptive on-time module is used to reduce the change rate of a switching frequency under heavy load, and ensure that the change of the switching frequency under different load currents is small. The transient enhancement module is used to judge the output voltage, ensure that the output voltage is rapidly stabilized when the load current suddenly changes, reduce overshoot and undershoot, and thus the overall stability and reliability are improved; the sleep detection module Sleep is used to detect the driving signal V COMP of a switching tube, so as to control the Buck converter to enter a sleep state, thereby achieving the purposes of reducing power consumption and improving efficiency.

A voltage converter (100) includes a power stage circuit (110), a compensator circuit (130), and a modulator circuit (120). The power stage circuit (110) has an input voltage terminal, an output voltage terminal, and a pulse width modulation (PWM) control input. The compensator circuit (130) has a voltage input coupled to the output voltage terminal, and has a compensation output. The modulator circuit (120) has a compensation voltage input and a PWM control output. The compensation voltage input is coupled to the compensation output, and the PWM control output is coupled to the PWM control input. The modulator circuit (120) includes a slope compensation ramp generator circuit (122) configured to generate a slope compensation voltage ramp having a slope that decreases during at least a portion of a switching period.

The present invention provides a current detection circuit, which includes an inductor current detection circuit and a processing circuit. The inductor current detection circuit detects the inductor current of a direct current to direct current (DC‑DC) converter to generate a first detection current signal, wherein the average value of the first detection current signal is not constant under different input voltages of the DC‑DC converter. The processing circuit generates a second detection current signal, wherein the first detection current signal participates in the generation of the second detection current signal, the second detection current signal participates in the current mode control of the DC‑DC converter, and the average value of the second detection current signal is constant under different input voltages of the DC‑DC converter. Accordingly, the present invention also provides a current mode control circuit for a DC‑DC converter. The solution provided by the present invention can take into account both low compensation hardware cost and good line regulation / transient performance.

The invention relates to the technical field of power electronic converters, in particular to a single-phase Vienna rectifier circuit and a control method thereof. The single-phase Vienna rectifier circuit comprises a single-phase alternating current power supply, a switch module, a first capacitor and a second capacitor, the switch module is connected with the output end of the single-phase alternating current power supply, the switch module comprises a first switch piece and a second switch piece, and the first switch piece and the second switch piece are connected in series; the first capacitor and the second capacitor are connected in series with the output end of the single-phase AC power supply, and the switch module is connected between the first capacitor and the second capacitor; wherein the single-phase Vienna rectifier circuit is configured to select a current mode according to the output voltage of the single-phase AC power supply, and the switch module controls the first switch member and the second switch member according to the current mode. The circuit switches on and off of the switch module according to the output voltage and the current, so that hysteresis control of a high power factor is achieved.

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 *).

An alternating current / direct current (AC / DC) power converter including a bridgeless power factor correction (PFC) circuit and a controller is provided. The bridgeless PFC circuit includes input-side wirings, output-side wirings, an input-side capacitor, a reactor, and a pair of switching elements disposed between the input-side wirings and the output-side wirings, and on which a switching operation is performed by the controller. The controller includes a peak current control unit which executes a peak current mode control by using a first slope compensation circuit corresponding to a positive polarity of AC input voltage, and a second slope compensation circuit corresponding to a negative polarity of the AC input voltage. The second slope compensation circuit has an inverting circuit which inverts the polarity of the AC input voltage, and is structured using a same slope compensation circuit as the first slope compensation circuit.

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.

A multilevel buck converter includes a plurality of switches, an inductor, a flying capacitor, and a control circuit. The plurality of switches are coupled between an input terminal and a ground. The input terminal has an input voltage. The inductor is coupled between the plurality of switches and an output terminal for generating an inductor-current signal. The flying capacitor is coupled to the plurality of switches for generating a flying capacitor voltage. The control circuit is coupled to the output terminal and the plurality of switches for generating a plurality of switching signals according a feedback voltage and the inductor-current signal. The control circuit operates in a valley current mode with dual slope compensation.

A power converter with slew rate detection is disclosed. A power converter comprises a plurality of phase circuits coupled to a regulated power supply line via corresponding ones of a plurality of inductors. A first control loop generates, using digital samples and based on comparisons of a reference voltage to a voltage on the regulated power supply line, a first plurality of control signals. A second control loop, using the digital samples, generates a second plurality of control signals based on a rate of change of the voltage of the regulated power supply line. The second control loop causes the first control loop to control the plurality of phase circuits in response to detecting that the rate of change is within a specified range, and causes the second control loop to control the plurality of phase circuits, in response to detecting that the rate of change exceeds the specified range.

The invention provides a no-load protection circuit controlled in a hysteresis current mode and a control method of the no-load protection circuit. The no-load protection circuit comprises an MOSFET and a current detection resistor. The inverting input end of the hysteresis operational amplifier is connected to the voltage detection point of the current detection resistor, the non-inverting input end of the hysteresis operational amplifier is connected to the output end of the error amplifier, and the output end of the hysteresis operational amplifier is connected to the grid electrode of the MOSFET; the non-inverting input end of the error amplifier is connected to a reference voltage, the inverting input end of the error amplifier is connected to a feedback voltage, and the output end of the error amplifier is connected to the non-inverting input end of the hysteresis operational amplifier and connected to the compensation capacitor; one end of the compensation capacitor is connected to the output end of the error amplifier, and the other end is grounded; the feedback resistor is connected in series between the output voltage and the ground and is used for dividing the output voltage to obtain feedback voltage; the hysteresis voltage and the compensation voltage are compared through the hysteresis operational amplifier, the on-off state of the MOSFET is controlled, transmission of input energy is adjusted, and stability and no-load protection of the output voltage 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 relates to a high-peak current output circuit which comprises a control module and a switching tube capacitance conversion circuit. The switching tube capacitance conversion circuit is connected between the current input end and the current output end; the control module is connected with the current input end to receive the current feedback signal and is connected with the switching tube capacitance conversion circuit to change the working state of the switching tube capacitance conversion circuit in an independent current mode control mode when the current feedback signal is lower than a preset target current value until the output current reaches the target current value; when the current feedback signal is lower than the preset target value, the control module can change the working mode of the switching tube capacitance conversion circuit, and the output current is increased until the target value is reached. According to the design, the high ripple current passing capacity of the switching tube capacitance conversion circuit is fully utilized, high-peak current output can be achieved in a limited space, meanwhile, damage to a magnetic device due to overload is avoided, and the reliability and efficiency of a system are improved.

The application provides a hysteresis current mode controller and a control method thereof. The controller comprises at least a comparator and a hysteresis voltage generating circuit. The non-inverting input terminal of the comparator is connected to the hysteresis voltage, the inverting input terminal is connected to a detection voltage, and the output terminal generates a driving signal. The hysteresis voltage generating circuit is used to switch the output between the upper limit value and the lower limit value of the hysteresis voltage according to the driving signal. The lower limit value of the hysteresis voltage is a first fixed value. The upper limit value of the hysteresis voltage changes with the dimming voltage when the dimming voltage is less than a first reference voltage, and is a second fixed value when the dimming voltage is greater than the first reference voltage. The second fixed value is related to the first reference voltage. The hysteresis current mode controller and the control method thereof provided by the application solve the problem that the width of the hysteresis voltage of the existing hysteresis current mode controller cannot be adjusted.

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.

A current mode control type switching power supply device includes a first switch having a first terminal connected to a first application terminal to which an input voltage is applied, and a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to a second application terminal to which a predetermined voltage lower than the input voltage is applied. A current sensor is configured to sense current flowing in the second switch. A controller configured to control the first switch and the second switch, wherein the controller is configured to control the first switch and the second switch independently of a difference between the input voltage and an output voltage and in addition in accordance with the current sensed by the current sensor.

The invention relates to a non-linear transient improvement for a current mode controller. A method of increasing a transient response of a current mode controller and a current mode controller with an improved transient response are provided. The current mode controller is configured to control the high side switch and the low side switch. The current mode controller includes a pulse width modulation generator.

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.

To enable a peak current mode control by using a slope compensator in the market in an AC / DC converter with a bridge-less PFC circuit.SOLUTION: In an AC / DC converter 6, a bridge-less PFC circuit 20 has an input side capacitor 23, a reactor 24, and a first switching element 25 and a second switching element 26 performing a switchover operation and a switching operation according to a polarity of input voltage by a controller 14. The controller 14 has a peak current control unit 80 for executing peak current mode control by using a first slope compensation circuit corresponding to a positive polarity of the input voltage and a second slope compensation circuit corresponding to a negative polarity of the input voltage. The second slope compensation circuit includes an inversion circuit 85 and is constituted by the use of a second slope compensator 83 the same as a first slope compensator 81 of the first slope compensation circuit.SELECTED DRAWING: Figure 6

Embodiments of the present disclosure relate to current sharing schemes in current mode control for multi-phase DC-DC converters. Schemes for providing current sharing among parallel converters in a multi-phase configuration are disclosed. In certain embodiments, based on current sharing errors among the parallel converters, a cycle-by-cycle, on-the-fly correction to compensate signal offsets is provided to enable improved on-the-fly current sharing performance.

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 invention relates to the technical field of power supplies, in particular to a small household electrical appliance power supply and a circuit protection method, and the power supply comprises an isolation power supply power circuit, an overvoltage protection circuit, an overcurrent protection circuit, a chip peripheral circuit and a negative feedback circuit. An isolation power supply power circuit of the power supply has an electrical isolation characteristic, various circuit combinations such as an overvoltage protection circuit, an overcurrent protection circuit, a current type control chip and a negative feedback circuit are added, the isolation power supply power circuit uses a transformer in a power loop, and TL431 and an optocoupler are jointly constructed in a signal loop. The overvoltage protection circuit adopts output resistance proportion voltage division and then is connected to the self-locking protection circuit and the protection circuit, the overcurrent protection circuit adopts the mode that a current sampling resistor is added below a high-frequency switching device MOS tube, voltage collected by the current sampling resistor is transmitted to a current type control chip, the chip works inside to close PWM waves, then the MOS tube is closed, and the current sampling resistor is connected to the self-locking protection circuit and the protection circuit. Therefore, the circuit is protected, and the electric shock risk of people is avoided.

The present invention relates to a current-mode controlled boost converter, comprising a control IC and peripheral circuitry. The IC peripheral circuitry includes: VIN, the system input voltage; VOUT, the system output voltage; L1, an inductor; D1, a freewheeling diode; C0, an output filter capacitor; N1, a power switch; C1, an external capacitor connected to the IC's VCC pin; R1, a resistor connected to the IC's RT pin for controlling the system's operating frequency; R2, C2, and C3, a compensation network between the IC's FB and COMP pins, which plays a decisive role in system stability; R3, a current sampling resistor; and R4 and R5, which form an output voltage sampling network whose ratio determines the output voltage. The proposed current-mode boost converter has a wide input voltage range, easily reduces output ripple, eliminates subharmonic oscillations, and facilitates loop stability adjustment.

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.