High-power charge and discharge control circuit applied to vehicle terminal

Abstract

The invention relates to a high-power charge and discharge control circuit applied to a vehicle terminal, comprising: a charge drive circuit, a charge execution circuit, a discharge drive circuit, a discharge execution circuit and a protection circuit, a load / charger, and a battery; one end of the load / charger is connected to an anode of the battery, and the other end is connected to the charge execution circuit; a cathode of the battery is connected to the discharge execution circuit, and the charge execution circuit is connected to the discharge execution circuit; the charge drive circuit isused for controlling the charge execution circuit, so that the load / charger, the battery and the discharge execution circuit form a loop to realize charge of the battery by the charger; and the discharge drive circuit is used for controlling the discharge execution circuit, so that the load / charger, the battery and the charge execution circuit form a loop to realize discharge of the battery to the load / charger.

Description

technical field [0001] The present invention relates to a charge and discharge control circuit, more specifically, it relates to a charge and discharge control circuit applied to a vehicle terminal. Background technique [0002] In the prior art, when charging the vehicle-mounted terminal, a matching charging control circuit must be used to charge the load. [0003] The existing vehicle-mounted terminal charging system uses relays as the control loop. The relay control system relies on the action of mechanical contacts. The operating frequency is low. The switching action of the contacts is generally on the order of tens of milliseconds, and the mechanical contacts will jitter. Secondly, because the relay control system uses a large number of mechanical contacts, there are many connections, there are mechanical wear and arc burns when the contacts are opened and closed, and the contact life is short, so the reliability and maintainability are poor. Thirdly, the relay relies...

AI Technical Summary

Problems solved by technology

[0003] The existing vehicle-mounted terminal charging system uses relays as the control loop. The relay control system relies on the action of mechanical contacts. The operating frequency is low. The switching action of the contacts is generally on the order of tens of milliseconds, and the mechanical contacts will also have vibration problems.

Secondly, because the relay control system uses a large number of mechanical contacts, there are many connections, there are mechanical wear and arc burns when the contacts are opened and closed, and the contact life is short, so the reliability and maintainability are poor.

Thirdly, the relay relies on the electromagnetic coil for mechanical action. The electromagnetic coil consumes a lot of electric energy when it works, and the greater the power of the relay, the greater the energy consumed by the electromagnetic coil, and the electromagnetic coil needs to consume several times more energy than usual at the moment of pull-in. , will have an impact on the control system

[0004] There are also vehicle-mounted terminals using electronic circuits in the prior art, but due to problems such as many wiring lines and charging delays, some designs have poor anti-interference ability, which will damage the internal structure of the battery and reduce the service life of the battery. Lead to battery leakage, smoke, fire, and even explosion, causing property losses to consumers and bringing hidden dangers to personal safety

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