Voltage Control
First Claim
1. A dynamic voltage restorer circuit for connection in a power line, the circuit comprising capacitive storage means, switch means, and control means operable to detect the voltage of the power line and to control the setting of the switch means in dependence on the result, the switch means being operable selectively either to connect the storage means in series into the power line to restore voltage on the line by providing stored energy to the line, or to connect the power line to bypass the storage means.
1 Assignment
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Accused Products
Abstract
A dynamic voltage restorer circuit 14 comprises capacitive storage means 16, switch means 18 and control means 20. The switch means 18 includes an array of anti-parallel diodes 34 and switchable unidirectional devices 36. Appropriate control of the switchable devices 36 by a control 20 allows the capacitor 16 to be connected in series into the power line 24a,24b, with either polarity, to inject stored energy into the line, thereby restoring the voltage.
8 Citations
20 Claims
- 1. A dynamic voltage restorer circuit for connection in a power line, the circuit comprising capacitive storage means, switch means, and control means operable to detect the voltage of the power line and to control the setting of the switch means in dependence on the result, the switch means being operable selectively either to connect the storage means in series into the power line to restore voltage on the line by providing stored energy to the line, or to connect the power line to bypass the storage means.
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18. A dynamic voltage restorer circuit for connection in a power line, the circuit comprising capacitive storage means, switch means, and control means operable to detect the voltage of the power line and to control the setting of the switch means in dependence on the result, the switch means being operable selectively either to connect the storage means in series into the power line to restore voltage on the line by providing stored energy to the line, or to connect the power line to bypass the storage means, and wherein the switch means comprises at least four pairs of uni-directional current conductors in anti-parallel arrangement, each pair comprising at least one switchable device, the switchable device of the first pair of devices having a conduction direction from the positive terminal of the capacitive storage means to the input from the power line, and the switchable device of the second pair of devices having a conduction direction from the input from the power line to the negative terminal of the storage means, and the switchable device of the third pair of devices having a conduction direction from the positive terminal of the storage means to the output to the power line, and the switchable device of the fourth pair of devices having a conduction direction from the output to the power line to the negative terminal of the storage means.
Specification