Drive circuit and air conditioner

Abstract

The invention discloses a driving circuit and an air conditioner. The driving circuit comprises a DC power supply input end, a first control end, a second control end, an H-bridge switching circuit, afirst level inverting circuit and a second level inverting circuit, wherein an upper bridge arm switch in the H-bridge switch circuit is a PMOS tube, a lower bridge arm switch is an NMOS transistor,one of the diagonal upper and lower bridge arm switches is connected with a level inverting circuit and the other bridge arm switch is connected to a control end at the same time, thereby achieving the simultaneous on-off, avoiding the staggered on-off of the upper bridge arm switch and the lower bridge arm switch in the same bridge arm switch circuit, simplifying the structure of the drive circuit, and solving the direct connection problem of the drive circuit. Meanwhile, the MOS tube is adopted for driving, and the H-bridge switching circuit is higher in rapidity, so that the driving circuitcan be used for controlling various tight moving parts such as a motor, can also be used for driving a DC four-way valve, and is wide in application range.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a driving circuit and an air conditioner. Background technique [0002] At present, the drive of loads (such as motors, DC four-way valves, etc.) in air conditioners is mostly driven by H-bridge drive circuits. The four switch tubes in the H-bridge circuit need to be set with four control signals, and there are many control signals. Moreover, the logic is complex, or a dedicated driver chip is used to realize the dead time of turning on and off the upper or lower tube, the cost of the driver chip is high, and the circuit design of the control board is likely to be complicated. [0003] Such as figure 1 as shown, figure 1 It is a schematic diagram of a conventional drive circuit. Drive1 and Drive2 receive high and low levels respectively to control the interleaving conduction of transistors Q5 and Q6 respectively, and then control the MOS transistors Q1 and Q4 of the H-...

AI Technical Summary

Problems solved by technology

[0004] However, this circuit has a straight-through problem. Specifically, the turn-on voltage of Q3 is 0.5V to 1.5V, and the turn-on voltage of Q4 is -1.0V to -2.5V. If the voltage of Q5 changes from 0 to 11.5V, it must be To pass through the interval (1.5V ~ 9V), both Q3 and Q4 will be turned on in this interval

Because Q3 and Q4 are connected through for a short time, the current flowing through the MOS tube is large, which is easy to cause damage to the MOS tube, and the safety is low

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