4results about How to "High isolation voltage" patented technology

The invention discloses a peak current control circuit and method without power tube current sampling, and belongs to the field of power converter control, and the peak current control circuit comprises a driving signal generation circuit, an inductive current detection circuit, a sampling hold circuit, a differential voltage detection circuit and a voltage-current conversion circuit. The differential voltage detection circuit realizes difference detection of an input voltage Vin and an output voltage Vout, the voltage-current conversion circuit realizes linear conversion from a voltage value to a current value, the sampling hold circuit realizes periodic sampling of an inductive current average value, and the inductive current detection circuit realizes detection of the inductive current average value. The driving signal generation circuit realizes generation of PWM waves. According to the invention, the difficulty of current sampling can be reduced, the sampling loss can be reduced by flexibly using the low-resistance sampling resistor, the space occupation of the power converter is reduced, and the power density of the converter, the switching frequency and the isolation voltage level of the converter can be improved.

The utility model discloses a grid driver power supply, which comprises an input driving circuit, an output circuit and a grid driving circuit, and the first output end of the output circuit is connected with the input end of the grid driving circuit. The input driving circuit is connected with the first input end of the output circuit through a first isolation signal channel circuit; the first isolation signal channel circuit is a millimeter wave isolator; in the grid driver power supply, the input driving circuit and the output circuit are isolated through the millimeter wave isolator, and compared with the existing optical isolation and magnetic isolation, the millimeter wave isolation mode can realize higher signal transmission speed and higher isolation voltage; the high isolation voltage can be realized while the signal transmission speed is improved, and the problems of low speed and low isolation voltage of the existing optical isolation and magnetic isolation are well solved.

This application provides a stacked optocoupler packaging structure and its fabrication method, belonging to the field of optoelectronic semiconductor packaging technology. The structure includes: an emitter lead frame, an infrared chip, a receiver lead frame, and a photosensitive chip; the infrared chip is flip-chip bonded to the emitter lead frame; the photosensitive chip is bonded to the receiver lead frame; the emitter and receiver lead frames are stacked vertically; a Fresnel focusing lens is positioned above the photosensitive chip and bonded to it with an adhesive; a packaging shell is composed of a transparent inner potting compound layer and a black outer potting compound layer, formed sequentially by molding. The packaging shell encapsulates the emitter assembly, receiver assembly, and Fresnel focusing lens, and exposes some pins of the emitter and receiver lead frames. This application achieves high isolation voltage, reduces packaging size, improves photoelectric conversion efficiency, enhances long-term reliability, and simplifies the manufacturing process.

The invention provides a DC isolation circuit and a power device, and the circuit comprises a waveform generator circuit which is connected to a power supply and is used for transmitting a waveform signal; the variable gain control circuit comprises a first input end, a second input end and a third input end and is used for controlling waveform gain of the third input end based on voltage comparison of the first input end and the second input end, the first input end is used for acquiring grounding voltage, and the second input end is used for acquiring feedback voltage. The third input end is connected to the output end of the waveform generator circuit through the amplification filter circuit to obtain a waveform signal; the inverter circuit is connected to the output end of the variable gain control circuit through the driving circuit and comprises an isolation transformer, the isolation transformer comprises a magnetic core, a primary winding, a secondary winding and a feedback winding, the secondary winding is used for outputting voltage, and the feedback winding is connected to a feedback loop after being rectified. The feedback loop is connected to the second input end of the variable gain control circuit. The isolation voltage is improved, and the voltage and load regulation rate is reduced.