10 results about "Switching frequency control" patented technology

This invention relates to a thermal control method for grid-connected converters that balances low harmonics and junction temperature limitations, belonging to the field of intelligent power electronics control. It employs a DPWM modulation method that locks the optimal clamping interval under overload conditions and couples this method with switching frequency control. Offline simulation is used to scan the switching frequency, obtaining data on the peak junction temperature and grid current variations as a function of the switching frequency, which is then stored in a lookup table accessible to the controller. During operation, feasible switching frequency ranges are selected based on junction temperature and dual constraints, and a recommended switching frequency range is provided. Within the acceptable frequency range, the optimal frequency reduction point is selected according to a proposed selection function, thus achieving a dynamic trade-off between thermal safety and system performance during overload. This invention, by fully considering the coupling effect of DPWM and frequency reduction, provides the optimal operating frequency point to ensure the safe and compliant operation of the converter under overload conditions.

An apparatus includes a logic circuit having a clock input, a first logic circuit control output, and a second logic circuit control output. A clock generation circuit has a first clock control input, a second clock control input, and a clock output. The clock output is coupled to the clock input. An off-timer circuit has an off-timer output. A comparator has a comparator output. An out-of-audio (OOA) circuit has a first OOA input, a second OOA input, a third OOA input, a first OOA output, and a second OOA output. The first OOA input is coupled to the comparator output. The second OOA input is coupled to the clock output. The third OOA input is coupled to the off-timer output. The first OOA output is coupled to the first clock control input. The second OOA output is coupled to the second clock control input.

Provided an electronic device including a main body and a kit connected to the main body, and the main body includes a battery, a first motor, an electric wire connected to the battery, and a first controller connected to the electric wire, the kit includes a second motor supplied with power through the electric wire, an inverter connected to the second motor, and a second controller connected to the electric wire and configured to control driving of the inverter, and the second controller is configured to transmit information to the first controller through switching frequency control of the inverter and control a switching frequency of the inverter so that a current associated with the second motor is greater than zero in a section in which transmission of the information is performed.

Operating system for a hybrid inverter coupled to a multiphase electric machine, comprising first gate drivers with wide-bandgap (WBG) transistors connected to a first subset of transistors, second gate drivers with silicon-based (Si) transistors connected to a second subset of transistors, and a controller. The hybrid inverter includes the first subset and the second subset of transistors arranged in phase branches, including a first section of the phase branches utilizing the first subset of transistors and a remaining section of the phase branches utilizing the second subset of transistors. The first gate driver controls the first section of the phase branches at a first switching frequency. The second gate driver controls the second section of the phase branches at a second switching frequency.The second switching frequency is lower than the first switching frequency.

The application discloses a capacitor switch number control method and device, and the method comprises the following steps: obtaining the reactive power of a capacitor bank of a transformer substation and all switch displacement information of the capacitor bank; the switch displacement information contains time information, opening instruction information and closing instruction information; according to the time information, the opening instruction information and the closing instruction information are sorted and analyzed to obtain the switch action number corresponding to the capacitor bank; based on the reactive power of the capacitor bank, the capacitor bank is classified and counted to obtain a total account of capacitor bank equipment; the total account of capacitor bank equipment is associated with the switch action number corresponding to the capacitor bank to obtain capacitor switch information account based on the bus of the transformer substation; whether all the capacitors in the capacitor switch information account need to be controlled in terms of switch number is determined by using a dispersion analysis method. Therefore, the service life of the capacitor bank and the switch is prolonged, and the strategy optimization of the reactive power compensation control is realized.

This invention provides a three-port converter and a three-port power conversion system, relating to the field of circuit technology. The converter can bidirectionally transfer power between three ports, each of which can operate as a power source or load. It includes a primary-side switching network at the first port for driving a transformer, and secondary-side resonant tank circuits at the second and third ports. The converter achieves electrical isolation and provides voltage gain. The system includes a controller configured to monitor the voltage and power at each port and generate gate drive signals to regulate power transfer between the input port and at least one output port via switching frequency control. A cross-regulation function allows the voltage at one port to be fine-tuned to a target value while maintaining the voltage at another port at a substantially constant state. The converter can employ a variant design of a multiphase transformer to distribute conduction losses and thermal stress, and improve power handling capacity.

The application discloses a power converter control method applied to a power converter with a common primary full-bridge switching circuit of an interleaved parallel Boost circuit and a dual active bridge converter. The output voltage, output current, grid voltage and grid-connected current of a photovoltaic module are collected, the target duty ratio of the primary full-bridge switching circuit is calculated based on the photovoltaic output parameters, the grid synchronous phase is obtained at the same time, the phase-shifted ratio adjustment amount is obtained by closed-loop regulation of the grid-connected current, the nominal phase-shifted ratio of the primary and secondary sides of the dual active bridge converter is calculated through the grid-connected current mathematical model in combination with the photovoltaic output voltage, the preset maximum switching frequency threshold and the grid-connected current reference value, the actual phase-shifted ratio and the real-time switching frequency matched with the actual phase-shifted ratio are determined after the nominal phase-shifted ratio is superimposed with the phase-shifted ratio adjustment amount in combination with the target duty ratio and the grid synchronous phase, and finally, the photovoltaic maximum power point tracking and unit power factor grid-connected inversion are realized by controlling the power converter based on the target duty ratio, the actual phase-shifted ratio and the real-time switching frequency.

An electronic device is provided. The electronic device includes: a first transistor configured to connect an input voltage node to a switching node; a second transistor configured to connect the switching node to a ground node; a latch circuit configured to generate a first signal having a first frequency and to control the first frequency based on a level of a load current; a switching modulation circuit configured to generate a second signal having a second frequency which is 1 / N (where N is a natural number) times the first frequency; and a controller configured to control each of the first transistor and the second transistor, based on the second signal.

The invention relates to audio output switching frequency control. An apparatus includes a logic circuit (120) having a clock input, a first logic circuit control output, and a second logic circuit control output. The clock generation circuit (110) has a first clocked input, a second clocked input, and a clock output. The clock output is coupled to the clock input. A turn-off timer circuit (160) has a turn-off timer output. The comparator (140) has a comparator output. An audio output (OOA) circuit (170) has a first OOA input, a second OOA input, a third OOA input, a first OOA output, and a second OOA output. The first OOA input is coupled to the comparator output. The second OOA input is coupled to the clock output. The third OOA input is coupled to the turn-off timer output. The first OOA output is coupled to the first clocked input. The second OOA output is coupled to the second clocked input.

The application discloses a kind of energy storage inverters and its resonance frequency self-checking method, resonance frequency self-checking method includes: control energy storage inverter output preset resonance detection power, with current switching frequency operation;The input voltage and output voltage of power conversion module are obtained, and the output voltage deviation is calculated;Judge whether the absolute value of output voltage deviation is less than the preset error tolerance, if yes, the resonance frequency is assigned as the current switching frequency, and the current self-checking is ended;If no, according to the change trend of the absolute value of output voltage deviation, the frequency disturbance direction applied to the switching device is determined;Based on the frequency disturbance direction and the preset frequency disturbance step, a new switching frequency is generated;The switching frequency is updated to the new switching frequency, and the switching device is controlled using the updated switching frequency at preset disturbance period intervals, and the output voltage deviation is judged again.The application ensures that energy storage inverter can maintain high efficiency and high reliability operation throughout its life cycle.