A power supply for electric vehicles

Abstract

The invention provides a power source used for an electric vehicle. The power source comprises a high-voltage battery and a direct current converter. The direct current converter comprises a power source input anode end, a power source input cathode end, and an enable signal end used for starting the direct current converter. The anode end of the high-voltage battery is electrically connected with the power source input anode end. The cathode end of the high-voltage battery is electrically connected with the power source input cathode end. A start controlling relay is arranged between the anode end of the high-voltage battery and the enable signal end. The direct current converter comprises a direct current converting module, an equipment power supply power source output end, and a normal power source output end. The normal power source output end can still provide power for constant electric equipment under the condition that the direct current converting module does not work.

Description

technical field [0001] The invention relates to the field of automobile power supply control, in particular to a power supply of an electric vehicle. Background technique [0002] An electric vehicle is a complex system composed of multiple systems. In a pure electric vehicle, since a starter motor is not required, a 12V storage battery is theoretically not required. However, in the parking state, the vehicle's start switch, anti-theft alarm, etc. still need a standing 12V power supply to start the DC-DC converter and other low-voltage electrical equipment on the vehicle. [0003] In response to this requirement, there are two common solutions for pure electric vehicles. One of the options such as figure 1 As shown, the DC-DC converter is often connected to the main battery, and its output is used to supply power for constant current equipment, such as the start switch, and other low-voltage equipment is controlled by the relay of the start switch. However, in this soluti...

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Problems solved by technology

Due to the existence of the battery, the DC-DC converter can be stopped when the vehicle is parked, but the charging process of the battery needs to be managed, otherwise there will be safety hazards, so the actual circuit will be more complex than figure 2 The schematic diagram of the circuit in is complicated, and at the same time, due to the increase of the battery, the installation of the wiring harness will also become complicated accordingly.

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