Patent ID: 9651613
Date: 2017-05-16
CPC Classifications: G01R

Claim:
1. A circuit board testing system, comprising: a computer system; and a testing fixture connected with a circuit board and the computer system, and acquiring a real voltage value of an electronic component of the circuit board, wherein the testing fixture comprises: a contact element disposed on the testing fixture and contacted with the electronic component of the circuit board; a switching circuit connected with the contact element; a connection module connected with the connected with the switching circuit and the circuit board, wherein the circuit board and the computer system are connected with each other through the connection module, so that the computer system is in communication with the circuit board and an electric power is transmitted from the computer system to the circuit board through the connection module; and a data acquisition unit electrically connected with the switching circuit and the computer system, and providing a start voltage to the switching circuit, thereby enabling the connection module and acquiring the real voltage value of the electronic component, wherein the data acquisition unit comprises a digital output pin and an analog input pin, wherein the digital output pin is connected with the switching circuit and outputs the start voltage to the switching circuit, wherein the analog input pin is connected with the electronic component and acquires the real voltage value of the electronic component, wherein after the real voltage value is acquired by the analog input pin, the real voltage value is transmitted from the data acquisition unit to the computer system, so that computer system judges whether the circuit board is qualified according to the real voltage value, wherein the connection module comprises: a power supply circuit connected with the switching circuit, the computer system and the circuit board, wherein when the power supply circuit is enabled, the electric power is transmitted from the computer system to the circuit board through the power supply circuit; and a communication circuit connected with a driving circuit, the computer system and the circuit board, wherein when the communication circuit is enabled, a computer communication protocol information of the computer system is transmitted to the circuit board through the communication circuit, and a device communication protocol information of the circuit board is transmitted to the computer system through the communication circuit; and wherein the power supply circuit comprises: a first light emitter, wherein a first input terminal of the first light emitter is connected with the data acquisition unit, a second input terminal of the first light emitter is connected with a ground terminal, and the first light emitter emits a first light beam in response to the start voltage; a first metal-oxide-semiconductor field-effect transistor, wherein a first output terminal of the first metal-oxide-semiconductor field-effect transistor is connected with a first transmission pin of the computer host, and a second output terminal of the first metal-oxide-semiconductor field-effect transistor is connected with a first signal contact of the circuit board, wherein when the first light beam is received by the first metal-oxide-semiconductor field-effect transistor, the first metal-oxide-semiconductor field-effect transistor is closed, so that the power supply circuit is enabled; wherein the communication circuit comprises: a second light emitter, wherein a third input terminal of the second light emitter is connected with the data acquisition unit, a fourth input terminal of the second light emitter is connected with the ground terminal, arid the second light emitter emits a second light beam in response to the start voltage; a second metal-oxide-semiconductor field-effect transistor, wherein a third output terminal of the second metal-oxide-semiconductor field-effect transistor is connected with a second transmission pin of the computer host, and a fourth output terminal of the second metal-oxide-semiconductor field-effect transistor is connected with a second signal contact of the circuit board, wherein when the second light beam is received by the second metal-oxide-semiconductor field-effect transistor, the second metal-oxide-semiconductor field-effect transistor is closed; a third light emitter, wherein a fifth input terminal of the third light emitter is connected with the data acquisition unit, a sixth input terminal of the third light emitter is connected with the ground terminal, and the third light emitter emits a third light beam in response to the start voltage; and a third metal-oxide-semiconductor field-effect transistor, wherein a fifth output terminal of the third metal-oxide-semiconductor field-effect transistor is connected with a third transmission pin of the computer host, and a sixth output terminal of the third metal-oxide-semiconductor field-effect transistor is connected with a third signal contact of the circuit board, wherein when the third light beam is received by the third metal-oxide-semiconductor field-effect transistor, the third metal-oxide-semiconductor field-effect transistor is closed, wherein when both of the second metal-oxide-semiconductor field-effect transistor and the third metal-oxide-semiconductor field-effect transistor are closed, the communication circuit is enabled, so that the computer communication protocol information is transmitted to the circuit board and the device communication protocol information is transmitted to the computer system.