6results about How to "Reduce voltage spikes" patented technology

The invention belongs to the technical field of electronic circuits, and provides a low-dropout linear voltage stabilizing circuit, a low-dropout linear voltage regulator and electronic equipment. The low-dropout linear voltage stabilizing circuit comprises an error amplification module, a buffer module, a power module, a feedback module and a transient enhancement module, the buffer module is connected with the error amplification module, the power module and the transient enhancement module, the power module is connected with the transient enhancement module, the feedback module and a load, and the feedback module is connected with the error amplification module. When the current on the load changes, the transient enhancement module provides the first current for the power module according to the target voltage, so that the power module quickly adjusts the target voltage according to the first current and quickly responds to the change of the load; the feedback module outputs feedback voltage according to the target voltage; the error amplification module outputs an error signal according to the feedback voltage and the reference voltage; the buffer module outputs a driving signal to the power module according to the error signal, so that the power module maintains the target voltage stable according to the driving signal.

The invention discloses a voltage regulating circuit and an inverter system, the voltage regulating circuit comprises a first capacitor C1, a voltage dividing branch and a voltage stabilizer D which are connected in parallel between a first node and a second node, a second capacitor C2 and a resistor R0 are connected in parallel between the second node and a third node, and the voltage between the first node and the third node is the total voltage Vs; partial voltage of the total voltage Vs at the first node and the third node is used as driving voltage of the switching tube; a voltage dividing point of the voltage dividing branch is connected to the voltage stabilizer D, and the voltage stabilizer D adjusts the voltage drop of the resistor R0 based on the voltage V2 of the voltage dividing point; the voltage monitoring module is used for monitoring the bus voltage of the inverter system, and when the bus voltage is smaller than a voltage threshold value, the partial voltage of the first node serves as the first driving voltage Vout1; when the bus voltage is larger than the voltage threshold value, the partial voltage of the first node serves as the second driving voltage Vout2, and the first driving voltage Vout1 is larger than the second driving voltage Vout2.

The application discloses a megahertz synchronous rectification system and a wireless charger, and the system comprises a wireless charging receiving side resonant converter and a megahertz synchronous rectification control circuit. The wireless charging receiving side resonant converter comprises a resonant cavity and a half-bridge synchronous rectification module, the input end of the half-bridge synchronous rectification module is connected with the resonant cavity, and the output end is connected with a load. The megahertz synchronous rectification control circuit comprises a signal processing module and a resonant gate drive module, the signal processing module acquires the coil voltage of the resonant cavity and carries out voltage division, comparison and amplification, and outputs a square wave gate drive signal; the resonant gate drive module shapes the square wave gate drive signal into a sine wave gate drive signal. Wherein, the resonant gate drive module introduces an adjustable phase delay, which is used for compensating the fixed phase delay of the signal processing module and the synchronous rectification switch tube, so that the conduction timing of the switch tube is in phase with the resonant cavity current. The application significantly improves the rectification efficiency of the wireless charging receiving end and reduces the system loss.

A direct-current capacitor series-parallel laminated busbar for an SVG power module relates to the technical field of electrical connection and comprises a laminated busbar and a base plate, capacitor mounting holes are distributed on the laminated busbar, a capacitor is mounted in each capacitor mounting hole, and the capacitor mounting holes are communicated with the base plate. The laminated busbar comprises a plurality of layers of thin copper sheets located inside and an insulating film located outside, every two adjacent thin copper sheets are connected, each capacitor installation hole penetrates through the corresponding thin copper sheet, and the capacitors are electrically connected with the thin copper sheets. Two layers of thin copper are laid inside the busbar, so that parasitic inductance of the busbar is remarkably reduced, current can be better distributed, the problems of local overheating and uneven current density are reduced, the phenomenon that peak voltage occurs in the working period of a capacitor is greatly reduced, and the performance and reliability of a whole power electronic system are improved.

The utility model discloses a printer power supply with a high overcurrent point, which comprises an EMI filtering and rectifying circuit, a PFC control circuit, an LLC control circuit, an output rectifying and filtering circuit and a feedback circuit, and the PFC control circuit is used for boosting to improve the power factor of the power supply. By adopting LLC control, over three times of overcurrent points can be realized, the efficiency is relatively high, the voltage spike of the MOS tube and the diode is relatively small, and the safety is relatively high. Compared with a traditional flyback topology scheme power supply, the size of the whole power supply can be smaller; and the working characteristic of LLC control serving as a soft switch also enables the circuit to have better anti-electromagnetic interference performance. In the EMI filtering and rectifying circuit, the lightning stroke and surge protection effect is achieved through a fuse, a piezoresistor and a thermistor, and the electromagnetic infection resistance is further improved after filtering.

The invention relates to the field of driving of power electronic devices, and provides a resonance-assisted low-impedance SiC MOSFET crosstalk suppression driving circuit, which comprises an upper bridge arm unit and a lower bridge arm unit, and is characterized in that the upper bridge arm unit and the lower bridge arm unit respectively comprise a driving loop, a resonance-assisted branch, a low-impedance loop and a SiC MOSFET which are connected in sequence, the low-impedance loop comprises an NPN triode Q1, a PNP triode Q2, a diode D2 connected with an emitting electrode and a grid electrode of the NPN triode Q1, a diode D3 connected with an emitting electrode and a grid electrode of the PNP triode Q2, and a capacitor C8 of which one end is connected with a collector electrode of the NPN triode Q1 and a collector electrode of the PNP triode Q2 and the other end is connected with a source electrode, and a base electrode of the NPN triode Q1 and a base electrode of the PNP triode Q2 are connected with the resistance module; according to the invention, the Miller current is shunted, and the positive and negative voltage spikes are suppressed.