What is power upply of hold-up board?

A true backup battery, the power supply with hold-up board is composed of capacitors, stores energy in the form of electrical charges, and thus ensures continuity of power supply in the event of a disturbance or outage.

When a capacitor, whether ceramic, polypropylene or another type, is connected to a direct current source, it stores energy in the form of an electric field. Once disconnected from the source, the capacitor retains this energy without resistance and without the need for any additional printed circuit board programming.

This system requires no control; energy is stored and released autonomously, with no visual indicator, such as an LED or dial, to signal its operating status. No calibration or voltage measurement is necessary, and there is no monitoring or surveillance at the capacitor's electrical terminals.

This simple and reliable process maintains the stability of embedded electronic systems, even in the event of a sudden power cut or variation.

When the power supply with hold-up board complies with DO-160, section 16, category A, it provides protection against electrical disturbances for 200 milliseconds, offering essential safety, particularly for aeronautical applications where equipment reliability and continuity are critical.

Power supply with hold-up boards reserves should not be confused with capacitive probes or capacitive sensors. Capacitive probes and sensors are measurement and control devices :

• Capacitive or pneumatic probes measure liquid levels and water quantities and are used, for example, to control irrigation for soil crops. They can manage the necessary water supply and soil moisture via valves and ball valves, controlling the flow of water from reservoirs on farms. Weather stations are also equipped with them to measure water levels in millimetres.
• Capacitive sensors measure the displacement, distance or position of various elements. Some also measure water or gas pressure.

The power supply with hold-up boards has nothing to do with a capacitive purger, which is used to purge compressed air networks.

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