6 results about "Pwm modulator" patented technology

The application discloses a kind of self-adaptive power energy storage converter control method and system, this method can effectively solve the problem of overvoltage and under-voltage of grid-connected point and overcharge and overdischarge of energy storage battery by controlling the adaptive charge and discharge of energy storage battery.First, the grid voltage is sampled and the effective value is processed to obtain the grid voltage effective value feedback signal U gf_rms , and it is sent to the inverting input end of voltage error amplifier, and the grid voltage reference U ref Is sent to the non-inverting input end of voltage error amplifier.The output U e Of voltage error amplifier is obtained by positive and negative limiting link U e1 Is sent to one input end of multiplier.The state signal J of range determination is obtained by the state of charge signal Soc of energy storage battery, and the other input end of multiplier is sent.The output I ref Of multiplier is sent to the non-inverting input end and inverting input end of current regulator respectively with the charging current sampling signal I bf Of energy storage battery.The output of current regulator is used as modulation signal, and it is sent to PWM modulator.

A differential amplifier circuit is provided. The circuit includes a PWM modulator for generating a PWM signal representative of a difference between the first and the second staircase-like reference signals and the digital input signal, a DM-IDAC for receiving the PWM signal and providing a first and second differential mode current, a CM-IDAC for receiving the PWM signal and providing a common mode current, first and second loop integrators, and first and second comparators; each loop integrator comprising virtual ground node terminal for receiving the differential mode current, the common mode current, and a feedback signal from an output stage of the differential amplifier circuit via a feedback loop, and integrator output terminal for providing loop integrator output signal proportional to an integral of the signals received at the virtual ground node terminal, the comparators receiving the loop integrator output signal, and triangular reference signal.

The invention discloses a bidirectional DC-DC feedforward control system based on energy storage. The system comprises an input sampling module, a feedforward control module, a PWM modulation module and a power conversion module. The input sampling module is used for acquiring an input voltage and an output voltage in real time, processing the input voltage and the output voltage acquired in real time to obtain a processed input voltage and a processed output voltage, and transmitting the processed input voltage and the processed output voltage to the feedforward control module; the feedforward control module is used for generating a duty ratio correction signal according to the change of the processed input voltage and output voltage and transmitting the duty ratio correction signal to the PWM modulator; the PWM module is used for receiving the duty ratio correction signal, generating a corrected duty ratio signal and transmitting the corrected duty ratio signal to the power conversion module; and the power conversion module is used for outputting voltage according to the corrected duty ratio signal.

The invention relates to a three-phase shift regulation and control method for a CLLC resonant converter, and the method comprises the steps: monitoring an input voltage, an output voltage and power in real time: obtaining an actual input voltage, an actual output voltage and an external input target output voltage through the sampling of a hardware sampling circuit, and measuring the actual output voltage and an output current; an external voltage loop calculates a voltage error, and a current reference is obtained through the voltage loop, so that the voltage of the load / battery is kept at a target value; an inner current loop calculates a current error, and a power control quantity and a second output are output through the current loop; actual input voltage is measured and enters a table look-up module through a gain block, a table look-up LUT is carried out to obtain three phase shift parameters, the three phase shift parameters are input into a PWM modulator, and a PWM waveform is generated; the output end of the PWM modulator is connected with the CLLC converter to realize stable output, the optimal phase shift angle combination can be determined in real time, so that the comprehensive efficiency of the CLLC resonant converter in a full working range is maximized, and the problem of control performance bottleneck in the prior art is solved.

The invention belongs to the technical field of photovoltaic grid connection, and discloses a unified monitoring system and method for input side capacitance and direct current bus side capacitance of a photovoltaic inverter. The unified monitoring system comprises a power control unit, a PWM regulator, a voltage regulator and an ESR monitoring unit. The unified monitoring method comprises the steps that the power control unit is adjusted to be in a measurement mode, output voltage and current of the photovoltaic array are sampled and sent to the power control unit, a photovoltaic voltage reference is generated and sent to the in-phase end of the voltage regulator, and output voltage of the photovoltaic array is sent to the anti-phase end of the voltage regulator; the output of the voltage regulator is used as a modulation signal to control the on-off of a switching tube of the boost converter through a pulse signal generated in the PWM modulator; and the ESR monitoring unit is used for estimating the ESR of the input side capacitor and the DC bus side capacitor Cf on line according to the output voltage of the photovoltaic array, the modulation signal and the DC bus voltage. According to the method, the photovoltaic inverter does not need to be off-grid, and the method has the advantages of low cost, autonomous monitoring, unified monitoring and the like.

This application relates to pixels, display devices including pixels, and electronic devices including display devices. A pixel includes: a light-emitting element through which a driving current flows; a light-emitting element driver that generates the driving current based on a pulse-width modulation (PWM) signal; and a pulse-width modulator that generates a PWM signal based on first data bits to a k-th data bit. The PWM modulator includes: a data writer that writes first data bits to a k-th data bit in response to a scan signal; a PWM controller that stores first data bits to a k-th data bit and sequentially outputs first data bits to a k-th data bit in response to a clock signal; and a PWM signal generator that generates a PWM signal in response to the first data bits to a k-th data bit and a transmit signal.