Electromobile, as well as high-low voltage interlocking detection circuit and interlocking signal detection method thereof

Abstract

The invention discloses an high-low voltage interlocking detection circuit of an electromobile. The detection circuit comprises a first detection branch circuit for detecting voltage of a first low voltage terminal to output a first voltage detecting value, a second detection branch circuit for detecting voltage of a second low voltage terminal to output a second voltage detecting value, a filter connected between the first detection branch circuit and the second detection branch circuit, a controller for recognizing a connecting state of a connector according to the first voltage detecting value and the second voltage detecting value. Through the adoption of the detection circuit, the current connecting state of the connector can be accurately recognized, the connecting state comprises a complete connection state, a virtual connection state, an open circuit state, a short circuit state relative to the ground, and a short circuit state relative to a power source; the reliability and the safety of the detection circuit are higher. The invention further discloses the electromobile, and an electromobile interlocking signal detection method.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a high-voltage and low-voltage interlock detection circuit of an electric vehicle, an electric vehicle and an interlock signal detection method of the electric vehicle. Background technique [0002] Usually, in an electric vehicle, the voltage of the high-voltage direct current used to drive the whole vehicle is 250-600V, and the load power is between tens of kilowatts and two hundred kilowatts. Once the wires of the high-voltage components are exposed, there will be safety hazards. Therefore, in order to eliminate potential safety hazards, electric vehicles generally require that when high-voltage components are exposed, the entire vehicle can be quickly powered off at high voltage to avoid the risk of high-voltage electric shock. In response to this requirement, electric vehicles are generally equipped with a connector with high and low voltage interlock function. In ...

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Problems solved by technology

[0003] related technologies, such as figure 1 As shown, by detecting the voltage of any low-voltage terminal to judge whether the connector is well connected, the circuit can only identify the complete connection and complete disconnection (open circuit) of the connector, but cannot identify whether the connector has a virtual connection or whether the low-voltage terminal is short circuit

[0004] Additionally, if figure 2 As shown, by sending a pulse signal to one of the low-voltage terminals and detecting the pulse signal on the other low-voltage terminal at the same time, it is possible to judge whether the connector is well connected by detecting whether the pulse signals on the two low-voltage terminals are consistent. Although the circuit can identify Connectors are fully connected, completely disconnected, and low-voltage terminals are short-circuited, but it is impossible to identify whether the connector is virtual connected, and the pulse signal is easily interfered, which easily leads to misidentification

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