Apparatus and method for direct current cut-off
A technology of cut-off device and current cut-off, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection devices for automatic disconnection, circuit devices, etc., to avoid enlargement and reduce power loss.
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Embodiment approach 1
[0021] Based on the above, a DC interrupt device according to an embodiment will be described below with reference to the drawings. figure 1 The structure of the direct-current interrupter of Embodiment 1 is shown. Such as figure 1 As shown, the DC cutoff device has a power supply path 10, a current cutoff path 30, and a control unit 50 for controlling them. A switch 11 , a switch 12 , a resistor 13 , and a current detection unit 21 are provided in the conduction path 10 . A semiconductor switch 31 , a current source 41 , and a non-linear resistor 32 are provided in the current cutoff path 30 .
[0022] Normally, the switches 11 and 12 on the conduction path 10 are closed, and a current flows through the conduction path 10 . When current interruption is required due to an accident or the like, the semiconductor switch 31 is turned on and a current flow command is issued from the control unit 50 to the current source 41 to forcibly and temporarily energize the current interr...
Embodiment approach 2
[0057] Next, refer to Figure 5 (a), (b), (c), and (d) describe Embodiment 2. Figure 5 (a), (b), (c), and (d) indicate instructions figure 1 The timing of the change in the action of the DC cut-off device shown. This approach can be treated as a physical structure almost identical to figure 1 , figure 2 is the same as shown, but at the point of timing based on the control of the control section 50 is the same as Figure 4 (a), (b), (c), and (d) are somewhat different. Therefore, repeated descriptions are omitted in order to be consistent with Figure 4 (a), (b), (c), and (d) will be described below focusing on the differences in comparison.
[0058] This method is characterized by the timing at which the electrode opening control of the shutter starts, which is the timing of time D in the drawing. This timing is until the current of the current source 41 is controlled by the control unit 50 so that the current of the conduction path 10 decreases below a predetermined ...
Embodiment approach 3
[0062] Next, refer to Figure 6 (a), (b), (c), and (d) describe Embodiment 3. Figure 6 (a), (b), (c), and (d) represent the same Figure 5 (a), (b), (c), and (d) are different, description figure 1 The timing of the change in the action of the DC cut-off device shown. This approach can also be treated as a physical structure almost identical to figure 1 , figure 2 is the same as shown, but at the point of timing based on the control of the control section 50 is the same as Figure 4 (a), (b), (c), (d), Figure 5 (a), (b), (c), and (d) are somewhat different. Therefore, repeated descriptions are omitted in order to be consistent with Figure 4 (a), (b), (c), (d), Figure 5 (a), (b), (c), and (d) will be described below focusing on the differences in comparison.
[0063] This method is also characterized by the timing at which the electrode opening control of the shutter is started, which is the timing of time D in the drawing. That is, this timing (time D) is set to...
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