Voltage detection circuit for low quiescent current, and automobile

A voltage detection circuit and quiescent current technology, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problem of no way to achieve zero quiescent current, improve user experience, improve safety and reliability , the effect of low quiescent current
CN110208591AActive Publication Date: 2019-09-06HUIZHOU DESAY SV AUTOMOTIVE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUIZHOU DESAY SV AUTOMOTIVE
Publication Date
2019-09-06

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Abstract

The invention relates to the technical field of automobile voltage detection, in particular to a voltage detection circuit for low quiescent current, and an automobile. The voltage detection circuit for the low quiescent current comprises a power supply circuit, an ignition circuit and a voltage conversion circuit, wherein the power supply voltage of the power supply circuit and the enable signalof the ignition circuit are received, and according to the enable signal, conversion voltage and a reset signal are output; and the input end of a voltage sampling circuit is connected with the outputend of the power supply circuit, and sampling voltage is output according to the conversion voltage of the voltage conversion circuit. By use of the circuit, through the ignition circuit, the enablesignal is output to awaken the voltage conversion circuit, the voltage conversion circuit outputs conversion voltage to the voltage sampling circuit, the voltage sampling circuit is started, samplingvoltage is output to the detection circuit, and the detection circuit receives the sampling voltage, the conversion voltage and the reset signal so as to begin to detect. During flameout, the ignitioncircuit does not input the enable signal, the detection circuit does not work, so that the quiescent current is effectively lowered, and the quiescent current is zero under a standby situation.
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Description

technical field

[0001] The invention relates to the technical field of automobile voltage detection, in particular to a voltage detection circuit with low quiescent current and an automobile. Background technique

[0002] With the rise of electric vehicles, the requirements for quiescent current in automotive electronics are getting stricter. For various auto parts, more and more car manufacturers require very low quiescent current, or even zero quiescent current.

[0003] In actual automotive products, the chips of vehicle components need to detect the voltage of the battery line, so as to facilitate corresponding control. Usually, the voltage detection of the battery line needs to first sample the voltage through resistor division and then detect the sampled voltage. When the quiescent current is 32.25uA, there is no way to meet the product demand of zero quiescent current. Therefore, how to reduce the quiescent current of the voltage detection circuit of the battery lin...

Claims

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