44 results about "Pulse mode" patented technology

The invention discloses a fault signal dual-mode output method of a magnetic latching relay, particularly relates to the technical field of relay control, and is used for solving the problem of low mode switching efficiency caused by an existing physical jumper mechanism. The current mechanical state of the relay is detected by receiving a remote dual-mode switching instruction; applying a driving voltage sequence corresponding to the target mode according to the state; based on the iron core residual magnetism intensity and the dynamic margin of a target mode nominal value, judging and generating a driving enabling or degaussing trigger signal; when a driving enable signal is responded, the lag time difference between the voltage rising edge and the magnetic flux jump starting point is captured in real time, and the eddy current loss characterization quantity is generated by combining the product integration of the current differential and the temperature rise; adjusting the rising slope and the duty ratio of the driving voltage sequence according to the lag time difference and the over-limit condition of the eddy-current loss characterization quantity; and finally, the matching between an execution result and a target mode identifier is verified by controlling a coil current response waveform, and the continuous holding mode and the instantaneous pulse mode are remotely and reliably switched.

The present application relates to the technical field of mechanical fault diagnosis, and particularly relates to an engine main bearing quantitative diagnosis method based on adaptive filtering and impact enhancement; comprising the following steps: S1, using a pulse mode decomposition method, carrying out pulse mode extraction, and obtaining a residual signal of the extracted pulse mode; comprising the following steps: S11, assuming a pulse mode, obtaining a pulse mode sparsity quantitative index of the pulse mode; S12, constructing an adaptive filter set, extracting the pulse mode according to the adaptive filter set, and thus obtaining a residual signal; S2, based on the residual signal obtained in step S1, reconstructing a signal of a signal collected by the engine main bearing, and obtaining a reconstructed pulse envelope; S3, according to the pulse envelope, obtaining a standard decibel of the impact pulse value, and according to the standard decibel, evaluating the health state of the main bearing; the effectiveness of the diagnosis of the aero-engine main bearing is improved.

The application discloses a kind of parallel random number generation devices based on pulse driving micro-ring resonator cavity, by adopting pulse mode driving micro-ring resonator cavity, improve the instantaneous power level in cavity, enhance nonlinear effect, to effectively expand the effective bandwidth of chaotic entropy source, improve the complexity of entropy source.Meanwhile, using the characteristics that micro-ring resonator cavity naturally supports multi-wavelength output, and combining with filter demultiplexing structure, the parallel output of multiple chaotic entropy sources is realized, which is beneficial to improve the parallel generation ability of random number.Finally, by combining post-processing methods such as difference, quantization and decorrelation, the overall generation rate of random bits is improved while ensuring randomness quality.The application has relatively simple structure, is suitable for integrated implementation, and can meet the application requirements of high-speed parallel random number generation.

Systems and methods for interrogating a plurality of backscatter node devices in a wireless backscatter communication system are provided. The method may include transmitting one or more interrogator pulse signals from an interrogator device; for each of the one or more interrogator pulse signals, receiving at the interrogator device a raw backscatter signal including individual backscatter signals from each of the plurality of backscatter node devices, wherein each individual backscatter signal includes a reflection of the interrogator pulse signal modulated based on an input modulation signal of the respective backscatter node device; processing the one or more raw backscatter signals to determine a mapping model between the input modulation signal of each of the plurality of backscatter node devices and the one or more raw backscatter signals; and extracting one or more signals of interest based on the mapping model, wherein each signal of interest corresponds to an input modulation signal of a backscatter node device.

The system is used for detecting and evaluating the influence of a water film formed on the outer surface of the windshield glass on the definition of the windshield glass, and is characterized by comprising a water film thickness detection device arranged on the inner surface of the cockpit side of the windshield glass and used for detecting the thickness of the water film formed on the inner surface of the cockpit side of the windshield glass. The infrared detector can emit infrared light towards the outer surface side of the windshield glass in a pulse mode and receive reflected infrared light as a detection signal. The control device sends a control signal to the water film thickness detection device and can drive the water film thickness detection device to emit infrared light at a specified frequency through the control signal; and the calculation device receives the detection signal from the control device or the water film thickness detection device, and can determine a definition index capable of representing the definition of the windshield glass as a calculation result based on the detection signal. Therefore, the influence of the water film formed on the outer surface of the windshield glass on the definition of the windshield glass can be detected and evaluated in real time.

The application discloses a control method of a tubular PECVD film coating device, a solar cell film layer preparation method and a solar cell. The control method of the tubular PECVD film coating device comprises the following steps: during the common operation of a first radio frequency power supply and a second radio frequency power supply, the first radio frequency power supply and the second radio frequency power supply work in a pulse mode, a part of rising edges of the first radio frequency power supply does not coincide with at least a part of rising edges of the second radio frequency power supply, the transient electric field between two graphite boats can be avoided from being too large, and the process gas can be prevented from being ionized to form powder in the too large transient electric field, on the basis, the pulse width of the first radio frequency power supply and the pulse width of the second radio frequency power supply are partially overlapped, and the synergistic effect is enhanced.

This invention discloses a control method and system for permanent magnet synchronous motors based on adaptive weights in gradient prediction pulse modes. The method includes: 1) establishing a discretized current gradient prediction model considering delay compensation and motor DC voltage feedback, and reconstructing a reference current trajectory with harmonic characteristics using a nominal optimized pulse mode; 2) designing a degree-of-freedom control logic based on nonlinear mapping to address the performance mismatch problem caused by fixed weights in the prediction cost function; and 3) dynamically adjusting the weighting factor by evaluating the normalized composite index of motor torque and current in real time. During acceleration transients, low weights are used to release the degrees of freedom at the pulse switching moment of the three-phase inverter, accelerating motor torque establishment. During steady-state cruise, high weights are used to strengthen the inverter pulse position constraint, locking in the optimal harmonic distribution. This invention solves the problem of balancing dynamic response and steady-state harmonics in permanent magnet synchronous motors, significantly improving the transient quality and voltage disturbance robustness of the motor control system.

The application discloses a high-frequency pulse DC power output stability control device and belongs to the technical field of power supply control. The device proposes a state zeroing-knowledge injection control paradigm for the contradiction between overshoot and slow response after reset of the traditional controller in the pulse mode due to integral memory. At the starting moment of each pulse period, a pulse opening instruction is generated and a reset signal is generated with a delay, the integral capacitor is forced to discharge to make its output zero, and the overshoot risk is eliminated; according to the load current steady-state value collected during the last pulse off period and the current target duty cycle, a feedforward control value is determined; in the same control period when the integral value is zeroed, the feedforward value and the integral output value are added to generate a drive control signal, and finally the drive power switch output pulse current is modulated. Through the cooperation of physical state forced zeroing and system knowledge cross-period prediction injection, the application realizes the rapid and non-overshoot establishment of the pulse current, and effectively solves the dynamic performance bottleneck of the high-frequency pulse power supply.

The application discloses a kind of cooling method, device, magnetic suspension motor of magnetic suspension motor, storage medium and computer program product, motor winding of magnetic suspension motor is equipped with coolant pipeline, and electronic expansion valve is equipped on coolant pipeline;The method comprises: after magnetic suspension motor starts to work, the target opening of electronic expansion valve is determined according to the temperature of motor winding;Pulse mode is used to power on electronic expansion valve, and the energization time of electronic expansion valve is controlled according to the action frequency of electronic expansion valve, so that the opening of electronic expansion valve reaches the target opening while reducing the energization time of electronic expansion valve, reduce the heat at the place of electronic expansion valve.The scheme, by pulse mode to power on electronic expansion valve, and the energization time is controlled according to the action frequency of electronic expansion valve, so that the energization time of electronic expansion valve is reduced, the heat at the place of electronic expansion valve is reduced, avoid electronic expansion valve high temperature failure, ensure that magnetic suspension motor is stably operated.

The application provides a six-pulse positioning method, a motor driving control method, a module and a system, which comprise a motor control sequence generator, a programmable motor driver and an analog-to-digital converter; the motor control sequence generator outputs a preset six-pulse wave sequence one by one based on a first trigger signal output by the programmable motor driver in a six-pulse mode, and provides a duty cycle control signal and an upper and lower phase output mode control signal; the programmable motor driver is connected to the output end of the motor control sequence generator, and generates a corresponding PWM signal based on the output signal of the motor control sequence generator; and the analog-to-digital converter collects the total motor current of each cycle of the PWM signal in the six-pulse mode, and then calculates the current rotor position according to the current information. The application has low cost, short code length, small program complexity and simple operation steps.

The application relates to the field of sintering machine head electrostatic dust removal, and provides a sintering machine head electrostatic dust removal system which comprises an airflow homogenizing unit, an electric field dust removal unit, a high-frequency pulse power supply unit, an intelligent control unit and a dust concentration detector; the airflow homogenizing unit is arranged before the electric field dust removal unit; the high-frequency pulse power supply unit is signal-connected to the electric field dust removal unit; the intelligent control unit is signal-connected to the electric field dust removal unit and used for controlling the voltage of the electric field dust removal unit; the dust concentration detector is arranged at an outlet position of the electric field dust removal unit, the dust concentration detector is used for detecting the outlet dust concentration of flue gas at the outlet position of the electric field dust removal unit and sending the outlet dust concentration to the intelligent control unit; the intelligent control unit is signal-connected to the high-frequency pulse power supply unit, and when the outlet dust concentration is greater than 20 mg / Nm3, the pulse mode of the high-frequency pulse unit is activated; a sintering machine head electrostatic dust removal method is also provided; and the application has the effects of improving the efficiency and effect of electrostatic dust removal.

The invention discloses a double-wire double-pulse MIG welding power supply system based on fractional calculus. The double-wire double-pulse MIG welding power supply system comprises a host power supply, a slave power supply, a DSP control module, a master wire arc load and a slave wire arc load. One end of the host power supply is connected with a three-phase AC power grid, and the other end is connected with the main wire arc load. One end of the slave power supply is connected with the three-phase alternating current power grid, and the other end is connected with the slave wire arc load; the host power supply and the slave power supply are respectively connected with the same DSP control module, and the DSP control module is integrated with a fractional calculus control module; and the fractional calculus control module outputs four paths of pulse width modulation (PWM) signals to respectively control on and off of a switching tube of the host power supply and a switching tube of the slave power supply, so that the system enters a double-pulse mode to work. Complex nonlinear and time-varying dynamic characteristics of a welding arc and a molten pool system can be described and matched more accurately.

The invention discloses a Wi-Fi intelligent flowerpot based on an STM32 microcontroller and an intelligent plant maintenance method. The intelligent flowerpot comprises a pot body assembly, an environment sensing module, a main control unit, an execution mechanism module and a communication unit. The main control unit carries out calibration, filtering and compensation correction on the original data of the sensor through the data preprocessing module; calculating a soil humidity reduction rate, an evaporation trend and an illumination change gradient through a trend prediction module; and performing intelligent decision making by integrating the environmental parameter value and the change trend through a multi-factor coupling decision making module, and generating a control instruction. And the execution mechanism module carries out irrigation and segmented PWM light supplement execution according to a pulse mode. And the communication unit supports cloud interaction and is seamlessly switched to a local intelligent control mode when the network is disconnected. According to the invention, high-precision perception, feedforward prediction maintenance, multi-factor coupling intelligent decision and precise execution are realized, and the problems of rough perception, decision lag, extensive execution and dependence on the cloud end of the existing intelligent flowerpot are effectively solved.

The invention belongs to the technical field of radiation detection, and particularly relates to a wide-range pulse radiation sensitive radiation detection unit which comprises a Si-PIN detector (1) provided with an N-type end and a P-type end, the N-type end is connected with a bias power supply (2) and a charge sensitive pre-amplifier (4), the P-type end is connected with the input end of a current amplifier (5), and an operational amplifier is arranged in the current amplifier (5); and the bias power supply (2) is used for providing working bias voltage for the Si-PIN detector (1). According to the invention, a single Si-PIN detector is adopted to work in a pulse mode and a current mode at the same time, and the charge-sensitive pre-amplifier (4) and the current amplifier (5) are matched to complete measurement of pulse signals and current signals at the same time, so that integration and miniaturization of wide-range dose rate measurement and pulse radiation measurement units are realized; the use of Si-PIN detectors is significantly reduced, and the manufacturing cost is further reduced.

The application discloses a kind of double three-phase permanent magnet synchronous motor system low current ripple prediction control methods, belong to permanent magnet motor control technical field.First, construct the mathematical model of double three-phase permanent magnet synchronous motor based on vector space decoupling coordinate system;Using first-order forward Euler discrete method to establish discrete model;Pre-combine 12 candidate virtual voltage vector sets of inverter;Based on the least tracking target calculation voltage command, select the optimal voltage vector pair closest to it;Define the duty cycle of each vector, construct the prediction target function of stator current prediction tracking error;Solve the function, get the optimal duty cycle of optimal voltage vector pair and zero vector;Convert the optimal duty cycle into physical action time, generate PWM switching signal to drive inverter using symmetric 6 segment pulse mode.The application method is simple, the amount of calculation is small, can effectively suppress stator current ripple, reduce system current ripple, improve system steady control precision.

The application is a control method of constant temperature circuit of sensor, comprising the following steps: the circuit controller acquires information including initial ambient temperature, sensor structure parameters and historical heating response curve, establishes a temperature rise prediction model based on the information, and outputs temperature rise rate at multiple power levels; in the temperature rise starting stage, the circuit controller selects a target power level according to the prediction model, controls the heating element to be alternately turned on and off in a pulse mode with a first period 1, and realizes stepwise temperature rise; the application has the beneficial effects that: by dividing the sensor heating process into three stages of exploratory preheating, stepwise temperature rise and steady state maintenance, and combining real-time temperature sampling, dynamic modeling and control function feedback control, the sensor temperature can be accurately and stably controlled in the target temperature zone, which is much better than the traditional single-link constant voltage control method, ensures that the sensor works under the best thermal conditions, and improves the detection accuracy and repeatability.

The invention relates to the technical field of DTP-PMSM pulse width modulation, and discloses a prediction model for smooth switching of different pulse modes, which is provided with a current impact mathematical model of a DTP-PMSM system in the switching process of different pulse modes and a current prediction model of the DTP-PMSM system on the basis of unified modeling of output voltages of SVPWM and OPP pulse modes. The current impact mathematical model is constructed based on a voltage-current relation of an ABC three-phase winding and an XYZ three-phase winding of the DTP-PMSM under a two-phase rotating coordinate system, the current prediction model is established based on a DTP-PMSM system transfer function comprising a single L filter, discretization processing is carried out by adopting a bilinear discretization method, common-mode voltage components are ignored, and the current impact mathematical model and the current prediction model are integrated. And a current iterative calculation formula under the two-phase rotating coordinate system is obtained. The invention also discloses a method for smoothly switching different pulse modes. According to the prediction model for smooth switching of different pulse modes and the switching method, the current impact during switching is minimized, and the system performance and reliability are improved.

A plurality of active buffer assemblies and a flexible protective cover are arranged on the collision face of an anti-collision frame of the anti-collision vehicle in an array mode, and an optical fiber strain sensor is arranged on the flexible protective cover; the active buffer assembly comprises a mounting seat; a magnetic field generating device; the explosion-proof bag is filled with magnetorheological fluid; the buffer controller is configured to determine a rear vehicle collision main area and collision side areas located on the two sides of the collision main area based on signals of the optical fiber strain sensors. A plurality of magnetic field generating devices corresponding to the impact main area are controlled to work in a first pulse mode, so that the rigidity of the corresponding anti-explosion bag is alternately switched between a first rigidity level and a second rigidity level, and the first rigidity level is higher than the second rigidity level; and synchronously controlling the plurality of dry magnetic field generating devices corresponding to the impact side areas on the two sides to work in a second pulse mode, wherein the first pulse mode and the second pulse mode are opposite in phase. According to the invention, dynamic buffering and transverse movement secondary impact prevention can be realized.

The application provides a kind of detector signal processing circuit and detector signal processing method, applied in nuclear technology application field, detector signal processing circuit, comprising: detector is used to generate detection signal;Pulse mode circuit is connected with detector, pulse mode circuit is used to pulse shaping to detection signal, obtains pulse signal;High-order mode circuit includes multiple parallelly connected Campbell modules, the input end of Campbell module is connected with detector, and Campbell module is used to convert detection signal into first-order signal;Current mode circuit is connected with detector, and current mode circuit is used to convert detection signal into current signal;Control module is connected with pulse mode circuit, current mode circuit, the output end of each Campbell module respectively.This embodiment can improve the accuracy of neutron flux detection result, and expand the measurement range of detector.

The embodiment of the present application provides a kind of power source control method and system based on adaptive sampling, by the original signal provided by the external signal source is detected by preset time period after the external signal source is opened, and signal sampling mode is adjusted to target signal sampling mode according to detection result, the signal sampling mode includes continuous wave mode, pulse mode.The original signal is sampled by the target signal sampling mode, and the sampling data of the original signal is obtained.According to the sampling data, the pre-configured signal processing parameter is calibrated, and the calibrated target signal processing parameter is obtained, the signal processing parameter includes signal amplification parameter, power adjustment parameter, timing control parameter.According to the target signal processing parameter, the original signal is processed, and target signal is obtained and output.Thereby, the adaptability and stability of power source control equipment in different working environments are improved.

The invention relates to the field of semiconductor equipment, and provides a pulse air supply type air floatation device and an air floatation control method.The pulse air supply type air floatation device comprises a base, an air floatation plate, a pulse electromagnetic valve array, a sensor and a controller, the air floatation plate is arranged on the base, and the air floatation plate is provided with an air hole array; the pulse electromagnetic valve array is arranged in the base, and an outlet of each pulse electromagnetic valve is in fluid connection with one or more air outlet holes in the air hole array; the at least one sensor is configured to detect floating state information of the glass substrate in real time, and the floating state information comprises at least one of height, vibration frequency and phase; the controller is in signal connection with the at least one sensor and the pulse electromagnetic valve array, and the controller is configured to control the pulse electromagnetic valve array to work in a preset pulse mode based on the floating state information so as to adjust the rigidity and thickness of an air film between the glass substrate and the air floating plate.

The present application belongs to the technical field of powder material conveying and metering, and in particular to a weight-reducing feeder anti-wall-sticking intelligent control system for viscous materials and a control method thereof; comprising: a material characteristic identification module for obtaining or inputting at least one characteristic parameter of the viscosity level, critical relative humidity or rest angle of the material to be fed; a pulse mode library module, which is pre-set with at least two pulse working modes with different pulse intensity levels, each mode corresponding to a set of pulse parameters, the pulse parameters including pulse period, pulse pressure and pulse waveform; through a partition control module, differentiated pulse control signals for the upper and lower regions of the hopper are respectively generated, realizing accurate management of the electrostatic adsorption dominant area and the shear bridging dominant area, the wall cleaning efficiency being improved by more than 40% compared with single-zone uniform control, and the adverse effects of global high-intensity impact on the material filling state being avoided.

A method for characterizing in pulse-mode a III-V semiconductor transistor (2) utilizes an associated test bench (1). An RF pre-pulse is applied to the gate (2a) of the transistor (2) with a power level NRF defined according to a first predetermined law of variation so as to fix the charge state of the traps in the transistor (2). Then a first DC pulse and a second DC pulse are applied to the gate (2a) and to the drain (2b) of the transistor (2), respectively. The first DC pulse and the second DC pulse have a first DC level N1 and a second DC level N2, respectively, defined according to a second predetermined law of variation.

1. The name of the design product: function switching graphical user interface for electronic device. 2. The use of the design product: for an electronic device. 3. The design points of the design product: the interface content of the graphical user interface in the screen. 4. The picture or photo that best shows the design points: design 1 front view. 5. Design 1 is designated as the basic design. 6. The use of the graphical user interface: for function switching. 7. Other circumstances that need to be explained: the human-computer interaction mode of the graphical user interface: design 1 is the Chinese version, and design 2 is the English version. Design 1 front view is the interface that appears after the user presses the product's on key; design 1 interface change state diagram 1 is the interface that appears after connecting the charger; design 1 interface change state diagram 2 is the interface that appears after being fully charged; design 1 interface change state diagram 3 is the interface that appears when the power is insufficient; design 1 interface change state diagram 4 is the interface that appears after selecting the sterilization mode; design 1 interface change state diagram 5 is the interface that appears after selecting the gentle mode; design 1 interface change state diagram 6 is the interface that appears after selecting the standard mode; design 1 interface change state diagram 7 is the interface that appears after selecting the strong mode; design 1 interface change state diagram 8 is the interface that appears after the dynamic pulse mode; and design 1 interface change state diagram 9 is the interface that appears after selecting the detection mode. Design 2 front view is the interface that appears after the user presses the product's on key; design 2 interface change state diagram 1 is the interface that appears after connecting the charger; design 2 interface change state diagram 2 is the interface that appears after being fully charged; design 2 interface change state diagram 3 is the interface that appears when the power is insufficient; design 2 interface change state diagram 4 is the interface that appears after selecting the sterilization mode; design 2 interface change state diagram 5 is the interface that appears after selecting the gentle mode; design 2 interface change state diagram 6 is the interface that appears after selecting the standard mode; design 2 interface change state diagram 7 is the interface that appears after selecting the strong mode; design 2 interface change state diagram 8 is the interface that appears after the dynamic pulse mode; and design 2 interface change state diagram 9 is the interface that appears after selecting the detection mode.

The invention discloses a pulse commutation method for a static frequency converter, and belongs to the field of motor dragging and power electronics. Acquiring three-phase induced voltage, and calculating the position of a rotor; a first inverter bridge and a second inverter bridge are driven according to the rotor position, the rotor position of the synchronous motor is divided into 12 intervals, and thyristors needing to be switched on corresponding to the first inverter bridge and the second inverter bridge in the intervals are inquired and obtained; turning on thyristors corresponding to the first inverter bridge and the second inverter bridge; the thyristors corresponding to the first inverter bridge and the second inverter bridge are turned off; and repeating the steps, switching 12 times in one period, and completing pulse commutation of the static frequency converter. When the motor is static or low in speed, the 12-pulse mode can provide larger dragging torque, and the static friction resistance torque when the motor is static is overcome.

The invention relates to the technical field of photovoltaic power station data communication, in particular to a communication method based on a photovoltaic module bypass unit. The signal generation circuit comprises a bypass MOS tube of the photovoltaic module, and a coded signal is coupled to a direct current power bus of the photovoltaic module in the forms of voltage ripple and current disturbance by controlling the switching action of the bypass MOS tube, so that communication between the photovoltaic module and a host is realized. According to the method, the requirements of special signal cables or wireless transceivers can be reduced, so that the cost is reduced, and the reliability of the system is improved; meanwhile, the time coding pulse mode provided by the invention has the characteristic of strong anti-interference capability, the sensitivity to electromagnetic interference is relatively low and the time coding pulse mode is suitable for being used in a severe environment due to the fact that data are represented through time intervals, and meanwhile, only a small number of logic control circuits need to be added in an original photovoltaic bypass system, so that the cost increase is extremely small.

The application discloses a control method of a switching converter, which sequentially enters a bootstrap capacitor pre-charging stage, a narrow pulse mode low-frequency starting stage, a narrow pulse mode volt-second balance frequency increasing stage and a complementary mode volt-second balance frequency increasing stage before entering a stable working state of a clamped asymmetric half-bridge flyback topology; on the one hand, the main power tube and the secondary rectifier tube can realize full-range zero-voltage switching and zero-current switching in the starting process, greatly improving the problems of large primary voltage and current stress and large secondary voltage stress of the existing clamped asymmetric half-bridge flyback topology during power-on starting; on the other hand, the starting speed of the switching converter can be effectively improved, and the smooth switching of the switching converter from soft-start voltage to loop feedback voltage for controlling the working of the switching converter can be ensured, and the current stress peak of the main power tube and the secondary rectifier tube caused by switching can be reduced; therefore, the safety and reliability of the switching converter can be improved.

A motor vehicle seat with rhythm adjustment function and module, comprising: a music obtaining module, an audio processing module, a resonance module; the resonance module comprises a diaphragm structure and at least one vibration device, the vibration device is arranged below the seat surface close to the user side, the diaphragm structure is arranged on the outer end surface of the vibration device, and is directly or indirectly attached to the seat surface, the diaphragm structure is arranged as at least a sub-diaphragm, each sub-diaphragm is attached to the surface of the vibration device to form a resonance module, and a plurality of resonance modules can generate a band gap effect based on the principle of local resonance and a band gap effect of the principle of Bragg scattering caused by the spatial periodicity of the plurality of resonance modules, so that the massage intensity on the seat changes in a pulse mode with the rhythm of music, the sound wave generated by the application is clear, accurate in positioning, wide in sound field, high in sound efficiency and good in vibration feeling.

Bias supplies and bias control methods are disclosed. One method comprises applying, during an ON pulse, a waveform using switching in connection with a DC voltage, removing the DC voltage while circulating current during an OFF pulse, reapplying the DC voltage, in advance of another ON pulse, and initiating the switching after reapplying the DC voltage to reapply the waveform during another ON pulse.

Bias supplies and bias control methods are disclosed. One method comprises applying, during an ON pulse, a waveform using switching in connection with a DC voltage, removing the DC voltage while circulating current during an OFF pulse, reapplying he DC voltage, in advance of another ON pulse, and initiating the switching after reapplying the DC voltage to reapply the waveform during another ON pulse.