High-voltage component of synchronous switch

Abstract

The invention discloses a high-voltage component of a synchronous switch. The high-voltage component of the synchronous switch at least comprises a transistor Q0 and N level sub-circuits, wherein each sub-circuit from a first level sub circuit to an Nth level sub circuit at least comprises a transistor Qi, a coupled circuit Zi, a charging loop circuit Chi and a discharging loop circuit Fi, each level charging loop circuit further comprises a switch Csi and a charging power supply Cdi, and each level discharging loop circuit further comprises a switch Fsi. When the transistor Q0 receives a driving signal, the driving signal between a driving turn-off signal and a driving turn-on signal can be coupled to each charging loop circuit Chi and each discharging loop circuit Fi in each level sub-circuit respectively through each coupled circuit Zi of each level sub-circuit, accordingly turn-off and turn-on of each charging loop circuit Chi and each discharging loop circuit Fi are controlled, then turn-off and turn-on of each level transistor are controlled, wherein the N is an integer greater than and equal to 1, and the i is an integer greater than and equal to 1 and smaller than and equal to N. According to the high-voltage component of the synchronous switch, synchronous turn-on and turn-off of all the transistors which are in series connection in a high-voltage switching circuit can be achieved.

Description

technical field [0001] The invention relates to a switch circuit, in particular to a high-voltage device with switches turned on synchronously, so as to realize the synchronous turn-on and turn-off of each transistor connected in series in the high-voltage switch circuit. Background technique [0002] Switching power supply is a power supply device that uses modern power technology to control the turn-on and turn-off time ratio of switching transistors to provide DC power for electronic equipment. The input of commonly used switching power supplies is 220V or 110V AC mains. In some special applications, The input voltage of the switching power supply of some equipment may be AC ​​480V or greater. Therefore, high withstand voltage switching devices are required in the switching power supply, and there are very few transistors suitable for this high-voltage occasion on the market at present, and the price is relatively low. high. [0003] Such as figure 1 As shown, the prior...

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Problems solved by technology

However, in this circuit, R1 is limited by its own power consumption, and cannot provide a large driving current when Q2 is turned on, so that the turn-on speed of Q2 is slow, and only after the transistor Q1 starts to turn on or off, Q2 can be turned on. That is, Q1 and Q2 in series cannot be turned on and off completely synchronously in the switching circuit. Therefore, the total turn-on or turn-off time required by the two MOS tubes in series is longer, which limits the use of transistor series circuits in high-frequency applications. The application also increases the switching loss of the transistor series circuit

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