Delay-start pre-charging circuit for robot

Abstract

The invention discloses a delay-start pre-charging circuit for a robot. The delay-start pre-charging circuit comprises a robot battery input terminal J1, a power supply input end BATTRY_INPUT, a pre-charging resistance power-on switch MOS tube Q1 and a post-stage load connection terminal J2 which are connected in sequence, wherein the source electrode of a delay-start circuit power supply switch MOS tube Q2 is arranged between and connected with the robot battery input terminal J1 and the source electrode of the pre-charging resistance power-on switch MOS tube Q1; a complete-machine switch terminal J3 is arranged between and connected with the source electrode of the pre-charging resistance power switch MOS tube Q1 and the source electrode of a delay-start circuit power switch MOS tube Q2; the drain electrode of the delay-start circuit power switch MOS tube Q2 is connected with a delay-start circuit power supply U1; the delay-start circuit power supply U1 is connected with a time delay circuit; and the output end of the time delay circuit is sequentially connected with a current amplification circuit, a direct current contactor driving connection terminal J4 and a driving coil of a direct current contactor. According to the delay-start pre-charging circuit for the robot, the effects of protecting the direct-current contactor, reducing starting current and protecting a post-stage circuit are achieved.

Description

technical field [0001] The invention relates to the technical field of robot starting circuits, in particular to a delay starting precharging circuit for robots. Background technique [0002] Robots generally contain various sensors and drivers, as well as executive motors, and their main power switches generally use DC contactors. The robot power supply bus generally adopts a large-capacity electrolytic capacitor or a structure in which multiple electrolytic capacitors are connected in parallel. The capacity is large. If the relay directly connected in series with the capacitor is closed, the initial state of the capacitor is equivalent to a short circuit, which will cause the relay contact to instantly A large current flows, which may burn out the relay contacts or reduce the life of the relay. Therefore, it is necessary to use a pre-charging circuit to pre-charge the electrolytic capacitor. [0003] The pre-charging circuit in the prior art is set at the BMS output term...

AI Technical Summary

Problems solved by technology

When the DC contactor is used as the main power switch, since the DC contactor needs to be closed, the pre-charging circuit inside the battery is used to drive the coil of the DC contactor, which makes it impossible to pre-charge the circuit of the subsequent driver, motor, etc. charging, it will lead to the failure of the pre-charging circuit of the battery, and the pre-charging effect cannot be achieved and the DC contactor cannot be protected.

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