Improved control device for voltage regulation of a power supply bus
|530 - Abstract of the offer:|
|The European Space Agency (ESA) presents an improved control device for voltage regulation of a power supply bus. This device eliminates a well-known drawback regarding voltage regulation of power supply buses where batteries are overcharged and damaged especially when the nominal battery of the battery is lower than the nominal voltage of the main bus. The organisation is seeking partners interested in licensing the technology.|
Description of the offer:
The prior work in this area is what is called sequential and serial switching shunt regulator architecture.
This is a three-state control device which selectively connects each solar generator to a power supply bus or to an electrical energy storage device, or short-circuits it. In this way, the three-state control device regulates the voltage on the main bus and at the same time charges the batteries, eliminating the need for a separate component. However, failure of a specific control unit or of a specific switch can overcharge the batteries and damage them. This problem is particularly acute if the maximum battery is lower than the nominal voltage of the main bus.
The specific technology addresses this drawback. The device has been tested in particular in the very demanding task of supplying satellites with electrical energy generated by a solar panel, but it can be generally used in any application that involves regulation of a power supply bus.
The device involves a first switch adapted, when in a closed position, to connect an electrical energy generator to an energy storage device, and a second switch adapted, when in a closed position, to short-circuit the generator. The generator is connected to the power supply bus if first and second switches are in an open position.
If an isolated fault causes the first switch to stick in its closed position, the device remains capable of preventing any overcharging of the electrical energy storage device by forcing closure of the second switch. If, in contrast, the isolated fault causes the second switch to stick in its open position, the first switch remains capable of opening in turn when said energy storage device is sufficiently charged. The other possible failure modes (first switch stuck open or second switch stuck closed) cannot cause overcharging of the batteries, or more generally damage the main power supply bus voltage regulation system; these failure modes merely render one of the numerous individual solar generators of the system partially or totally inoperative. A failure mode in which the first switch is stuck open and the second switch is stuck closed, which would cause overcharging of the battery, can never occur as a consequence of an isolated failure.
Innovations and advantages:
The innovation addresses the drawback of the prior art without significantly increasing the complexity of the system as a whole.
Domain of Application:
- Voltage regulation in power systems
- Electronic Components
- Power Supplies
- Solar energy
Last update: 15 January 2013