A method for testing the energy released by an automotive relay coil
A relay coil, automotive relay technology, applied in circuit breaker testing and other directions, can solve problems such as non-compliance
Inactive Publication Date: 2016-01-06
SHANGHAI HUGONG AUTO ELECTRIC
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- Description
- Claims
- Application Information
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Problems solved by technology
According to the VW80932 standard required by Shanghai Volkswagen, the energy released by the coil of a DC12V relay is generally safe within 3mJ. However, the existing test methods usually do not meet the requirements of this standard.
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Embodiment Construction
[0014] When the present invention is specifically implemented, it can be based on a special test instrument for testing the energy generated by the release of the automotive relay coil. The relay coil is required to be DC12V. Considering that the voltage fluctuation range of the vehicle system is 9V-16V, the maximum voltage value 16V that may appear in actual use is set in the test to be loaded on the vehicle relay coil for testing. The main hardware used in the test instrument includes: a test board independently developed by C8051F005 single-chip microcomputer, which adopts 12-bit high-precision ADC sampling test, ADC internal reference voltage, and each sampling and processing of a data takes 10μS. The instrument is started with one button, and the test process and results are indicated by LCD screen, indicator light display and buzzer.
[0015] The release energy of the automobile relay coil that the present invention relates to is E, and U is the voltage at both ends of ...
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The invention discloses an automotive relay coil energy releasing testing method. According to a testing circuit, a series circuit formed by a first voltage-regulator tube and a first current-limiting resistor is connected with a first MOS tube in parallel, one end of a relay coil is connected with a 16 v power supply, the other end of the relay coil is connected with the drain electrode of the first MOS tube, one end of the first current-limiting resistor is connected with the first voltage-regulator tube, and the other end of the first current-limiting resistor is connected with the ground after being connected with the source electrode of the first MOS tube in parallel. The method comprises the steps of carrying out primary actuation on the relay coil and disconnecting and releasing the relay coil after the relay coil is stabilized, sampling currents of the relay coil with the testing circuit to obtain an average current value I; carrying out secondary actuation on the relay coil and disconnecting and releasing the relay coil after the relay coil is stabilized, sampling voltages of the relay coil with the testing circuit to obtain an average voltage U; and calculating released energy of the relay coil, wherein t is releasing duration of the relay coil.
Description
technical field [0001] The invention belongs to the technical field of automobile electronics, in particular to a method for testing the energy released by an automobile relay coil. Background technique [0002] The energy generated by the release of the relay coil will have an impact on the entire circuit system, directly acting on the transistor and other components of the driving coil, causing its breakdown and failure to cause dangerous accidents. When the relay coil is turned from closed to off, due to the inductive nature of the relay, the coil will generate a self-excited voltage to suppress the change of current. The faster the coil current changes, the higher the reverse voltage generated. When released, a momentary voltage spike is generated on the low-voltage side of the relay, often reaching tens of times the rated voltage of the coil. At the moment when the element driving the relay is turned on to off, the relay coil will generate a large self-inductance elec...
Claims
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IPC IPC(8): G01R31/327
Inventor 高炜汪海岩李晨袁坚
Owner SHANGHAI HUGONG AUTO ELECTRIC