Battery jar voltage insulation test circuit based on linear optical coupler

Abstract

The invention belongs to the technical field of engine electronic control, in particular relates to a battery jar voltage insulation test circuit based on a linear optical coupler. The circuit utilizes the double-output linear optical coupler, connects the input of the double-output linear optical coupler with one output to form a feedback amplifying element and accurately measures a battery jar power supply in an isolation condition by utilizing the characteristic that the current of two output ends of the double-output linear optical coupler is same; a battery jar voltage passes by a diode D1 capable of resisting reverse connection to form a stable voltage Uz by a current-limiting resistor R1 and a voltage regulator tube Z13, and the stable voltage Uz provides an amplifier U1A with a power supply and provides the output end of a linear photoelectric coupled device U2 with a current source. The invention has the advantage that a system has a wide suitable voltage range; the output stage of the circuit is powered by a subsequent modulus circuit power supply, and the circuit outputs in a similar drain open mode of a triode circuit so as to be simple to be matched with a system interface and effectively prevent the overpressure output of the circuit.

Description

technical field [0001] The invention belongs to the technical field of engine electronic control, and in particular relates to a battery voltage isolation test circuit based on a linear optocoupler. Background technique [0002] The battery voltage measurement is relatively simple in theory. The existing test methods are divided into two categories: isolated and non-isolated; for non-isolated measurement, the method of resistive voltage division is generally used. This method is low in cost and simple in circuit. However, the scope of application of the circuit is relatively narrow, and it is difficult to match the voltage divider resistors when 12V / 24V is required to be compatible. The isolated measurement method is mainly completed in the form of an isolation amplifier. This method is costly, and the voltage range measured by the isolation amplifier is limited, so it is difficult to popularize in engineering applications. Contents of the invention [0003] The purpose o...

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Problems solved by technology

[0002] The battery voltage measurement is relatively simple in theory. The existing test methods are divided into two categories: isolated and non-isolated; for non-isolated measurement, the method of resistive voltage division is generally used. This method is low in cost and simple in circuit. However, the scope of application of the circuit is relatively narrow. In the case of 12V / 24V compatibility, it is difficult to match the voltage divider resistors.

The isolated measurement method is mainly completed in the form of an isolation amplifier. This method is costly, and the voltage range measured by the isolation amplifier is limited, so it is difficult to popularize in engineering applications.

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