Switching circuit board and protection method thereof
A switching circuit and discharge protection technology, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of semiconductor analog switch IC burnout, static electricity cannot be fully discharged in time, low withstand current and voltage, etc., to improve The effects of stability and detection efficiency, low cost, and large transient power
Active Publication Date: 2014-03-12
苏州莹琦电子科技有限公司
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Problems solved by technology
[0004] Traditional semiconductor analog switch switching circuit boards use ICs integrated with thyristor (SCR) arrays for protection circuits. This structure discharges slowly, so static electricity cannot be fully discharged in time, and its current withstand voltage is low, and it is vulnerable to surges. Damaged by high current impact, resulting in failure of the protection circuit and burning of the semiconductor analog switch IC
In addition, ICs that integrate thyristor arrays are more costly
Method used
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[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0033] like figure 1 As shown, the switching circuit board of the present invention includes: a protection circuit, a control circuit and a semiconductor analog switch IC array; the control circuit is used to disconnect and conduct the relay switch in the protection circuit, and the The protection circuit communicates with the semiconductor analog switch IC array; the relay switch includes relay switches K1, K2, K3 and K4, wherein K2 and K4 are grounded, and K1 and K3 are connected to a voltage source;
[0034] The protection circuit includes a group of forward discharge units and reverse discharge units correspondingly connected to the test channel, the forward discharg...
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The invention discloses a switching circuit board and a protection method thereof and relates to the technical field of manufacture of automatic circuit board measuring instruments. The switching circuit board comprises a protection circuit, a control circuit and a semiconductor analog switch integrated circuit (IC) array, wherein the control circuit is used for controlling the protection circuit and the semiconductor analog switch IC array; the protection circuit is communicated with the semiconductor analog switch IC array; the protection circuit comprises a group of positive discharge units and reverse discharge units, which are correspondingly connected with a testing channel; each positive discharge unit comprises a positive switching diode and a positive discharge diode which are connected; each reverse discharge unit comprises a reverse switching diode and a reverse discharge diode which are connected; an anode of the positive discharge diode and a cathode of the reverse discharge diode are grounded; and the positive discharge diode and the reverse discharge diode are transient voltage suppression diodes. The discharge speed is high, static electricity can be timely fully discharged, and the circuit board is hardly impacted by high surge current so as not to be damaged.
Description
technical field [0001] The invention relates to the technical field of manufacturing automatic circuit board measuring instruments, in particular to a switching circuit board and a protection method thereof. Background technique [0002] In the assembly circuit board (PCBA) manufacturing process of electronic information products, more and more use the assembly circuit board online test system (In-Circuit Test System) to quickly detect faulty components or assembly defects. [0003] In this kind of special testing equipment, the switching circuit board is an important part, which is connected between the board to be tested and the detection signal source and the measurement control circuit, and plays the role of switching the test channel. [0004] Traditional semiconductor analog switch switching circuit boards use ICs integrated with thyristor (SCR) arrays for protection circuits. This structure discharges slowly, so static electricity cannot be fully discharged in time, a...
Claims
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IPC IPC(8): H02H9/02
Inventor 程世忠
Owner 苏州莹琦电子科技有限公司