80results about "Power factor control" patented technology

The invention discloses a power supply circuit and electrical equipment. The power supply circuit comprises a three-phase power supply and three rectification and inversion modules, wherein each rectification and inversion module comprises a first input end, a second input end and an output end; the first input ends of the three rectification inversion modules are respectively connected to three phase lines in a three-phase power supply in a one-to-one correspondence manner; second input ends of the three rectification inversion modules are connected to a neutral line in the three-phase power supply; the output ends of the three rectification inversion modules are respectively connected to three loads in a one-to-one correspondence manner; and the rectifying and inverting module is used for sequentially rectifying and inverting the input voltage and then supplying power to corresponding loads. According to the invention, the three-phase power supply is divided into three independent single-phase power supply paths for three loads, single-phase rectification is carried out on each phase independently, the voltage level is reduced, a low-voltage-level device can be selected, and the cost is reduced; the three-phase load is balanced, the harmonic dispersion is realized, and the harmonic pollution is reduced; fault area isolation is realized, and maintenance difficulty and maintenance cost are reduced.

The invention discloses a power factor correction control circuit and a household electrical appliance, and the circuit comprises a rectification module which is connected to an AC power supply; the first end of the switching device is electrically connected with the first output end of the rectification module through an inductance device, and the second end of the switching device is electrically connected with the second output end of the rectification module through a resistance device; the first end of the load circuit is connected to the first end of the switching device, and the second end of the load circuit is connected to the second end of the switching device; the controller is electrically connected with the control end of the switching device, and is configured to obtain the input voltage of the load circuit and the output current of the rectification module; according to the input voltage and a preset voltage reference value, the step-up rate is obtained through calculation, and the preset voltage reference value is obtained through feedback adjustment according to the step-up rate obtained through calculation and a preset step-up rate reference value; and determining a control signal of the switching device according to the boost rate and the output current. According to the scheme, the control efficiency of the switching device can be improved.

A motor power source regulation circuit, a control method and an electronic device are provided. The motor power source regulation circuit includes a power factor correction circuit, an isolation circuit, a first power source conversion circuit, a second power source conversion circuit and a control circuit. The isolation circuit includes a first switch sub-circuit and an isolation transformer. The power factor correction circuit regulates an AC input signal to a first DC signal. The first switch sub-circuit converts the first DC signal to a first AC signal. The isolation transformer converts the first AC signal to two or more second AC signals. The first power source conversion circuit converts the second AC signal to a DC drive signal and outputs it to a DC motor. The second power source conversion circuit converts the second AC signal to an AC drive signal and outputs it to an AC motor.

The invention discloses a power factor correction control circuit and a household electrical appliance, and the circuit comprises a rectification module which is connected to an AC power supply; the switching device is electrically connected with the rectification module; the first end of the load circuit is connected to the first end of the switching device, and the second end of the load circuit is connected to the second end of the switching device; the controller is electrically connected with the control end of the switching device, and is configured to obtain the input voltage of the load circuit and the output current of the rectification module; according to the input voltage and a preset voltage reference value, a step-up rate is calculated; inputting the input voltage and the voltage reference value into a preset current compensation module, and calculating to obtain a current compensation value; and calculating a control signal of the switching device according to the boost rate, the output current and the current compensation value, so that the switching device executes conduction control according to the control signal. According to the technical scheme, the probability that high voltage generated by overshoot damages a switching device can be reduced.

Disclosed herein is a power control system of a processing plant, the power control system comprising: a control system configured to determine power characterisation data of the power supply to one or more loads in the processing plant; a power factor correction system configured to apply a power factor correction to the power supply; a vibration sensor system configured to generate vibration data of one or more locations in the processing plant and to transmit the vibration data to the control system; and a flowrate sensor system configured to generate flowrate data of fluid in one or more conduits in the processing plant and transmit the flowrate data to the control system; wherein the power factor correction applied to the power supply by the power factor correction system is generated in dependence on the determined power characterisation data and at least one of the vibration data and flowrate data.

This application discloses a servo driver and an industrial robot control cabinet. The servo driver, applied to the industrial robot control cabinet, includes: a drive control module, communicatively connected to the industrial robot control cabinet, for receiving instructions from the industrial robot control cabinet and generating control signals based on those instructions; and a drive power module, connected to both the drive control module and a motor, for receiving the control signals and driving the motor based on them. The drive power module has a first interface, through which the DC bus module of the industrial robot control cabinet is connected to the drive power module. The drive power module obtains DC bus power to drive the motor. This approach reduces safety risks and lowers overall costs.

An electric motor is provided. The electric motor includes a motor controller configured to convert AC power to a variable frequency variable voltage power for driving the electric motor according to a commanded motor output. The motor controller includes a PFC circuit configured to control a power factor of the electric motor and a microcontroller coupled to the PFC circuit and configured to activate the PFC circuit when the commanded motor output is greater than a threshold motor output, deactivate the PFC circuit when the commanded motor output is less than or equal to the threshold motor output, and generate a control signal based on the commanded motor output. The motor controller further includes an inverter configured to receive the control signal and generate the variable frequency variable voltage power according to the commanded motor output.

The embodiment of the invention provides a power factor compensation circuit and a household electrical appliance. The circuit comprises a rectification module; a switching device; a load circuit; the controller is electrically connected with the control end of the switching device and the load circuit, and the controller is configured to execute the following steps: inputting a pulse width modulation control signal to the control end of the switching device, so that the switching device is switched on based on the pulse width modulation control signal; acquiring the corresponding sampling voltage of the rectifier module during the current power frequency period; acquiring corresponding sampling current of the load circuit in the current power frequency period of the rectification module; determining a target control frequency corresponding to the pulse width modulation control signal based on the sampling current and the sampling voltage; and adjusting a pulse width modulation control signal input to the switching device according to the target control frequency. According to the technical scheme provided by the embodiment of the invention, current harmonics in the load current of the load circuit can be effectively reduced, and excessive use of a switching device is avoided.

The invention discloses a power factor compensation circuit and a household electrical appliance, the circuit comprises a switching device, a load circuit and a controller, the controller is configured to obtain a duty ratio value of a pulse width adjustment signal, and calculate a duty ratio value threshold according to a power supply voltage phase and a preset attenuation coefficient; according to the duty ratio value threshold value, carrying out limited shrinkage correction on the duty ratio value; and controlling the switching device to perform periodic on-off according to the duty ratio value after the limiting and shrinking correction. According to the technical scheme, when the power factor compensation circuit is started, the power factor compensation circuit cannot cause current overload.

An exemplary power conditioning method and system are disclosed using a power converter in combination with a diode bridge rectifier and a series transformer in which the power converter is configured to inject VARs to a high-speed rotating machine to compensate for the machine reactance. By injecting VARs into the machine using the power converter through the series transformer, the power converter can be fractionally rated, in terms of power rating, to a lower power rating which would otherwise have to be higher due to the reactance requirements due to its high-frequency input. And additionally, because of the lower power rating, the transformer can be beneficially rated for the corresponding power level of the machine. The operation of the diode bridge rectifier and a transformer does not add to the complexity of the control of the system or that of the power converter.

The embodiment of the invention provides a power factor compensation circuit and a household electrical appliance. The circuit comprises a rectification module; a switching device; a load circuit; wherein the load circuit comprises a variable frequency motor; the controller is electrically connected with the variable frequency motor and the control end of the switching device, and the controller is configured to execute the following steps that the switching frequency of a second control signal is determined according to the switching frequency of the first control signal, so that the switching frequency of the second control signal is integer multiples of the switching frequency of the first control signal; acquiring a motor sampling time point of the variable frequency motor in the switching period of the first control signal; and adjusting an output time difference between the first control signal and the second control signal according to the motor sampling time point, so that the motor sampling time point is not interfered by the second control signal. According to the technical scheme, it can be ensured that the electric signals sampled by the variable frequency motor at the motor sampling time point are not prone to being interfered by the switching device.

The embodiment of the invention provides a power factor compensation device and a household appliance. The power factor compensation device comprises a rectification module; a switching device; a load circuit; the first input end of the clamping circuit module is electrically connected with the first end of the switching device, and the second input end of the clamping circuit module is electrically connected with the second end of the switching device; the input end of the signal amplification module is electrically connected with the output end of the clamping circuit module; the controller is configured to execute the following steps that a control signal is input into the switching device, and the switching device is controlled to be switched on; obtaining the voltage signal amplified by the signal amplification module, and determining a voltage signal between the first end and the second end of the switching device according to the amplified voltage signal; and determining the current output by the rectifier module according to the voltage signal between the first end and the second end of the switching device and the set corresponding relation between the voltage signal and the current signal. According to the embodiment of the invention, the cost of a hardware circuit can be reduced.

A dual inverter drivetrain having an energy storing fuel cell integrated into an electric vehicle is disclosed. A method of operating the dual inverter drivetrain using a power sharing control approach is described, which allows the key requirements of a fuel cell to be achieved without compromising the dynamic performance of the electric vehicle drive system. In particular, the ability of this control approach to ensure unidirectional power transfer from the fuel cell even in the event of regenerative braking, and a slowly changing fuel cell power despite fast motor torque transients were exhibited.

The invention relates to an electric tool (1), in particular a hand-held electric tool, e.g. a polisher (1A), a grinder and / or a saw (1B), comprising a tool (2), an electric motor (3) for driving the tool (2), and a control unit (4) for controlling the electric motor (3), the electric tool (1) being designed to be connected to a mains voltage (V1) and comprising a rectifier assembly (12) with a DC link (15) for supplying a DC link voltage (V2) on the basis of the mains voltage (V1), wherein the DC link voltage (V2) includes a plurality of successive voltage half-waves (16), the control unit (4) is configured to provide a torque curve (28) for controlling the electric motor (3), said torque curve (28) comprising a torque half-wave (36) for each voltage half-wave (16), and the control unit (4) is configured to ascertain a back electromotive force (34) induced in the electric motor (3), and if the back electromotive force (34) is greater than or equal to the DC link voltage (V2), to reduce a current torque value of the torque curve (28).

The embodiment of the invention provides a power factor compensation circuit and a household electrical appliance. The circuit comprises a rectification module; a switching device; a load circuit; the controller is electrically connected with the control end of the switching device, and the controller is configured to execute the following steps: inputting a control signal to the control end of the switching device, so that the switching device is switched on based on the control signal; acquiring the corresponding sampling current of the resistance device during the conduction period of the switching device; and determining whether the alternating current provided by the alternating current power supply reaches the voltage zero crossing point according to the sampling current. According to the technical scheme of the embodiment of the invention, the power factor compensation circuit can obtain the voltage zero crossing point, so that reactive power in the load circuit can be effectively counteracted.

The invention provides a method for controlling a compressor system 1000, which is in particular part of a refrigeration cycle system, and which comprises an electrically operated compressor 1, configured for compressing a working medium, and a further electrical load 2. The compressor 1 in turn comprises an electric motor 11 for providing mechanical movement for compressing the working medium, an inverter 12, which supplies the electric motor 11 with single- or multi-phase alternating current, a power factor correction filter 13 (PFC), which supplies the inverter 12 with direct current and whose current input is connected to a mains connection point 2000 of an alternating current supplying mains power source for powering the compressor 1. The further electrical load 2 is connected to the same mains connection point 2000 as the power factor correction filter 13 for power supply.The procedure comprises operating the compressor system 1000 with electrical current from the mains power source, determining at least one current characteristic of the further consumer 2, which describes a current consumption of the further consumer 2, and controlling the power factor correction filter 13 of the compressor 1 at least as a function of the determined at least one current characteristic of the further consumer 2.

The application provides an over-temperature protection method of a variable frequency driving device and the variable frequency driving device, wherein the method comprises the following steps: obtaining the input voltage of a power supply circuit and the output voltage and output current of a driving circuit in real time during the operation of an alternating current motor, calculating the preliminary over-temperature threshold of a power module of the driving circuit, comparing the preliminary over-temperature threshold with the maximum temperature value allowed by the power module to determine the final over-temperature threshold, obtaining the temperature of the power module, judging whether the temperature of the power module exceeds the final over-temperature threshold, adjusting the speed instruction when the final over-temperature threshold is exceeded, and enabling the driving circuit to drive the alternating current motor to work according to the adjusted speed instruction. Thus, the over-temperature threshold of the power module is adjusted adaptively according to the input voltage, the output voltage and the output current, and the speed instruction is adjusted according to the over-temperature threshold, so that the temperature of the power device of the power factor correction circuit and the inverter circuit is prevented from being too high.

Enhanced network power factor corrective designs are presented that can use corrective devices that achieve long-term, operationally stable mechanical work. Embodiments can utilize reverse-winding induction motor designs with engineerable parameters and configurations for the reverse winding (13) in systems and through methods where an inductive motor (1) can present a current that leads voltage and a leading power factor (16) to correct other existing induction motors (8) in an initial network (9) or be optimized for a particular application. Designs also present a power factor correction that can present a variable correction without altering the character or physical capacitive value of an electrical correction component. Individual induction motors that have leading current and a leading power factor (16) can be provided to improve reverse winding induction motors. Progressive start controls (23) can also be used in a manner that limits inrush current to operational levels with passive current establishment control where reverse winding (13) effects can be used and perhaps even delayed to passively limit and even effect a current decrease while rotational acceleration continues after initial start transition.

Improves the power factor and distortion of the power supply input current caused by suppressing and controlling LC resonance. [Solution] This motor control device includes a rectifier circuit that rectifies and outputs AC output from a three-phase AC power supply, an inverter circuit, a DC link capacitor whose capacitance is set to suppress ripple voltage, and a reactor whose capacitance is set to suppress ripple current, the DC link capacitor and reactor functioning as a filter, and is characterized in that, with the phase Θ of one line voltage of the three-phase AC power supply as a reference, the motor control device controls the magnitude of the output voltage vector to change from positive to negative or from negative to positive, based on the average value of the output voltage vector of the inverter circuit when the phase Θ is in a range that satisfies Equation 1, at a timing when the phase Θ starts at π / 3×n (n is an integer of 0 or greater). (Equation 1) n×π / 3≦Θ<(n+1)×π / 3 (n is an integer of 0 or greater).

The embodiment of the invention provides a power factor correction control circuit and a household electrical appliance. The circuit comprises a rectification module; a switching device; a load circuit; the controller is electrically connected with the control end of the switching device, and the controller is configured to execute the following steps that the step-up ratio corresponding to the load circuit is determined according to the output voltage of the rectification module and the input voltage of the load circuit; determining a step-up ratio reference value corresponding to the load circuit according to a relation between the output voltage of the rectifier module and an input voltage preset limit value corresponding to the load circuit; and adjusting a control signal of the switching device based on the step-up ratio and the step-up ratio reference value, so that the switching device executes conduction control according to the control signal. According to the technical scheme, it can be avoided that the output voltage of the rectifier module is directly boosted through the step-up ratio to obtain the input voltage of the load circuit, so that the input voltage corresponding to the load circuit is not prone to large fluctuation, and the normal operation state is kept.

A method for controlling a compressor system includes an electrically operated compressor for compressing a working medium, and a further electrical load. The compressor includes an electric motor for compressing the working medium, an inverter supplying the electric motor with single- or multi-phase alternating current, a power factor correction filter (PFC) supplying the inverter with direct current and whose current input for supplying power to the compressor connects to a grid current source providing alternating current. For supplying power thereto the further electrical load connects to the same grid connection point as the power factor correction filter. The method includes operating the compressor system with electrical current from the grid current source, determining at least one current characteristic value of the further load, and controlling the power factor correction filter of the compressor at least in dependence of the determined at least one current characteristic value of the further load.

A control method for an electronically commutated fan is provided, including: calculating a frequency difference between an alternating direct current voltage and a phase signal; converting the frequency difference into a rotational speed command signal; performing modulation on the rotational speed command and the alternating direct current voltage to generate a frequency command signal; phase-adjusting a motor current to generate a phase-modulated current signal; calculating a current difference between the phase-modulated current and the frequency command; generating a pulse width modulation based on the current difference command; generating the phase signal and a plurality of motor control signals according to the pulse width modulation command and a Hall signal. The present invention also provides a control device for an electronically commutated fan, to be disposed between a rectifier and a motor of an electronically commutated fan, which can improve the power factor of the system.

The invention belongs to the technical field of household appliances, and particularly relates to a power factor correction control circuit and a household appliance, the circuit comprises a rectifier module, a switch device, a load circuit and a controller, the rectifier module is connected to an AC power supply; the switching device is electrically connected with the rectifier module; two ends of the load circuit are respectively connected with two ends of the switching device, and the load circuit is provided with a variable frequency motor; the controller is electrically connected with the control end of the switching device, and the controller is configured to execute the following steps: obtaining the input voltage of the load circuit, the output current of the rectifier module and the voltage control quantity of the variable frequency motor; according to the input voltage and a preset voltage reference value, a step-up rate is calculated; and determining a control signal of the switching device according to the boost rate and the output current, so that the switching device executes conduction control according to the control signal. The bus voltage can be adaptively adjusted, the device loss is reduced, the hardware cost is reduced, and the efficiency is improved.

An exemplary method and system for power conditioning using a combined diode bridge rectifier and series transformer power converter is disclosed, where the power converter is configured to inject VARs into a high speed rotating machine to compensate for its mechanical reactance. By using a power converter to inject VARs into the machine via a series transformer, the power converter can be rated slightly lower in terms of power rating than would otherwise be required to be rated higher due to reactance requirements from high frequency inputs. Furthermore, due to the lower power rating, the transformer can be beneficially rated for the corresponding machine power level. The operation of the diode bridge rectifier and transformer does not add any complexity to the system control or power converter control.

Power tools, comprehensive: an electric motor comprising a rotor and several stator armatures; a power supply interface which has at least one positive interface and one negative interface for connection to a power supply; a control circuit that is connected between the power supply interface and the electric motor and is used to control the operation of the electric motor; the control circuit includes at least the following: a first power supply line connected to the positive interface, and a second power supply line connected to the negative interface; several noise suppression devices designed to suppress noise on the electric motor side; wherein the multiple noise suppression devices comprise a first noise suppression device, wherein a first terminal of the first noise suppression device is connected to the stator armatures and a second terminal is connected to the first power supply line.

A power factor control apparatus includes: a phase detection unit configured to detect the phase of an output signal outputted from an inverter, which was originally used to supply electric power to a first electric power supply target, to a second electric power supply target that is different from the first electric power supply target and connected with the inverter and an inverter control apparatus for controlling the inverter; a correction amount calculation unit configured to calculate a phase correction amount based on a power factor command value that is a power factor required by the second electric power supply target; and a correction processing unit configured to generate, based on the phase detected by the phase detection unit and the phase correction amount calculated by the correction amount calculation unit, a power factor control signal for controlling the power factor of electric power supplied to the second electric power supply target and output the generated power factor control signal to the inverter control apparatus.

The embodiments of this application relate to a multi-motor integrated power circuit, a motor power control method and an electronic device; a power input conversion circuit converts a power input signal from a standby power source to a busbar power signal; a power factor correction circuit converts and superposes an AC input signal of the AC power source to / with the busbar power signal; a first isolation circuit converts the busbar power signal to an isolation output signal; a first switch sub-circuit converts the busbar power signal to a first AC signal; an isolation transformer converts the first AC signal to two or more second AC signals; a first power conversion circuit or an isolation transformer converts the isolation output signal or the second AC signal to a DC drive signal; a second power conversion circuit converts the isolation output signal or the second AC signal to an AC drive signal.

The utility model discloses a high-efficiency medical oxygen generator driver, which comprises a driving control board, a driving unit is arranged on the driving control board, the driving unit comprises a power supply input module, an MCU processing module, an inversion module and a synchronous motor, the power supply input module is used for supplying power to the MCU processing module, the inversion module and the synchronous motor, and the MCU processing module is used for supplying power to the inversion module and the synchronous motor. A power factor correction module is connected between the power supply input module and the MCU processing module, the MCU processing module is further electrically connected with the synchronous motor through an inversion module, the power factor correction module adopts a single-phase Boost PFC topology circuit to adjust the bus voltage of pulsating direct current to 380V, and when the inversion module outputs, the current phase is aligned with the voltage phase, so that the pulse direct current is output. The power supply input module comprises a power supply input interface and an EMI filtering and rectifying module which are connected in sequence. The structure improves the utilization rate of electric energy.