Channel switching circuit and test channel switching box

Abstract

The invention provides a channel switching circuit and a circuit channel switching box. The channel switching circuit comprises channel modules, the channel modules, namely contactors or relays are arranged in a combined mode, and the channel module connected with the first pole of the power supply is arranged at the tail position; each channel module is provided with a channel switch connected with the second pole of the power supply and normally open contacts connected to the two ends of the channel switch in parallel, and the channel modules arranged from the second position to the last position are each provided with a normally closed contact connected into the previous channel module in series. The channel in the number 6 is taken for explanation, if the channel switch in the third channel module is pressed down, the normally open contacts connected with the channel switches 3 in parallel are closed, the channel modules is connected into a circuit, and at the same time, the normally closed contacts of the channel modules 3 are disconnected and arranged in front of the normally closed contacts, namely, the channel modules at the first and second positions cannot be connected into the circuit. Only one channel module in the channel switching circuit can be switched on at most, disorder is prevented, and test safety is guaranteed.

Description

technical field [0001] The invention relates to the field of testing equipment and switches, in particular to a channel switching circuit and a testing channel switching box. Background technique [0002] When solving the problem of making full use of limited resources (such as lines, frequency bands, equipment, etc.) , in order to realize the flexible allocation of resources and complete the switching between channels of the signal flow. For the control method of the switch matrix, in the prior art, the microprocessor is generally used to accept user instructions to control the crossbar switch matrix, and a special power management module is equipped to supply power to the equipment. The investment in software and hardware is large, and software programming is required. The implementation process is complicated and the introduction period is long. ; and wherein the crossbar matrix is ​​specifically a crossbar matrix chip supporting wide input voltage, which cannot be direc...

AI Technical Summary

Problems solved by technology

For the control method of the switch matrix, in the prior art, the microprocessor is generally used to accept user instructions to control the crossbar switch matrix, and a special power management module is equipped to supply power to the equipment. The investment in software and hardware is large, and software programming is required. The implementation process is complicated and the introduction period is long. ; and wherein the crossbar matrix is ​​specifically a crossbar matrix chip supporting wide input voltage, which cannot be directly used as a channel in the case of a strong electric line, but can only be used as an indirect logic control. In essence, relays, contactors, etc. are still required as direct channels ; On the other hand, when faced with the occasion of one-line polymorphic alternate use, it must be ensured that only one channel is opened, that is, the channels are required to have absolute mutual exclusion characteristics, otherwise it will lead to confusion

Images