A control switch application circuit and its fault detection and protection method
A technology for controlling switches and fault detection, which is applied in program control, computer control, general control systems, etc., and can solve problems such as prone to serious accidents
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Embodiment 1
[0086] This example will take the control switch application circuit as a parallel control switch application circuit as an example for specific explanation;
[0087] Such as figure 2 , image 3As shown, the controlled side loop 1 in the parallel control switch application circuit includes two switch modules, of course, it can be connected with more than one switch module and load 11 for control switches. Wherein, each switch module includes a control switch 12 connected in series with a load 11; the control switch 12 is an IGBT. The so-called series connection means that the C pole or E pole of the IGBT is connected in series with the load 11 . After each IGBT and load 11 are connected in series, they are all connected to the main circuit of the electromagnetic relay 13 and controlled by the electromagnetic relay 13 .
[0088] The loads 11 in this example are mainly resistive loads 11 (eg, heaters, etc.), and the loads 11 are connected in parallel, and each load 11 is swi...
Embodiment 2
[0097] This example will take the control switch application circuit as a bridge control switch application circuit as an example for specific explanation;
[0098] Such as Figure 4 As shown, the controlled side loop 1 in the bridge control switch application circuit includes two switch modules, each switch module is connected in series with two control switches 12, and an output node ( or output terminal); the output nodes in the two-way switch module are connected to a load 11; this type of load 11 is generally a DC motor.
[0099] Each current detection module 24 is connected to the switch module; the control side loop 2 includes a controller 22, more than one driver module 23 and a man-machine interface 21, and the input end of each driver module 23 is connected to the controller 22. The output terminal of each drive module 23 is connected to the control terminal of the two control switches 12 in the corresponding switch module, and the control terminal is also the base ...
Embodiment 3
[0102] This example will take the control switch application circuit as a three-phase bridge control switch application circuit as an example for specific explanation; where, please refer to Figure 5 A disclosed application circuit block diagram of a three-phase bridge control switch, Figure 6 The three-phase motor load 11 disclosed in , the three-phase motor includes three terminals U, V, and W; Figure 7 A schematic diagram of a three-phase bridge control switch application circuit disclosed in .
[0103] The controlled side circuit 1 in the three-phase bridge control switch application circuit includes three switch modules, each switch module is connected in series with two control switches 12, and an output node is arranged between the two control switches 12; The output nodes in the switch modules are respectively connected to the U, V, and W terminals of the load 11 (three-phase motor); specifically, in each switch module, the C pole of the IGBT located on the upper b...
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