Automatic test device and system for optocoupler transmission ratio
A technology of automatic test equipment and transmission ratio, applied in the field of electronics, can solve problems such as unsatisfactory circuit designers
Active Publication Date: 2020-03-24
BEIJING RAILWAY SIGNAL
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Problems solved by technology
At present, there is no technology that can accurately test the transmission ratio of optocouplers, which cannot meet the needs of circuit designers.
Method used
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Embodiment
[0036] see figure 1 , figure 1 A structural diagram of an automatic test device for the transmission ratio of an optocoupler provided by an embodiment of the present invention. Optocouplers, that is, optocouplers, such as figure 1 As shown, the optocoupler transfer ratio automatic test device includes:
[0037] Connected with the optocoupler 101 to provide the optocoupler 101 with a controllable power supply 102 of an input voltage signal;
[0038] A PWM (PulseWidth Modulation, pulse width modulation) wave filter circuit 103 that is connected to the controllable power supply 102 and adjusts the output voltage signal of the controllable power supply 102;
[0039] Connected with the optocoupler 101, collect the primary and secondary current signals of the optocoupler 101, and convert the primary and secondary current signals into the current signal conversion circuit 104 of the primary and secondary voltage signals;
[0040] Connected with the current signal conversion circu...
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The invention discloses an optical coupling transmission ratio automatic testing device and system. The optical coupling transmission ratio automatic testing device comprises a controllable power supply which is connected with an optical coupler and provides an input voltage signal to the optical coupler; a PWM wave filter circuit which is connected with the controllable power supply, and adjusts an output voltage signal of the controllable power supply; a current signal conversion circuit which is connected with the optical coupler, and acquires primary and secondary current signals of the optical coupler, and converts the primary and secondary current signals into primary and secondary voltage signals; an analog to digital conversion circuit which is connected with the current signal conversion circuit, and converts the primary and secondary voltage signals which are analog signals into digital signals; and a master control chip which is connected with the PWM wave filter circuit and the analog to digital conversion circuit, continuously adjusts the duty ratio of the PWM wave until the primary and secondary voltage signals meet a preset test condition, and calculates the optical coupling transmission ratio of the optical coupler. According to the technical scheme, the optical coupling transmission ratio of the optical coupler can be tested accurately.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to an automatic test device and system for the transmission ratio of an optocoupler. Background technique [0002] Optocoupler is also called opto-isolator or opto-coupler, referred to as opto-coupler. It is a device that transmits electrical signals with light as the medium. Usually, the emitter (ie infrared light-emitting diode) and the light receiver (photosensitive semiconductor tube) are packaged in the same package. When the power signal is applied to the input end, the light emitter emits light, and the light receiver generates photocurrent after receiving the light, which flows out from the output end, thus realizing the "electricity-optical-electricity" conversion. The optocoupler, which uses light as a medium to couple the input terminal signal to the output terminal, has the advantages of small size, long life, no contact, strong anti-interference ability, insulation...
Claims
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IPC IPC(8): G05B19/042
CPCG05B19/042G05B2219/25341
Inventor 黄彦东韩雪松陈强谷建柱张健
Owner BEIJING RAILWAY SIGNAL