Beamex Oy Ab

Hannu Ketonen

Voltage reference circuits may be sensitive to thermal changes in their surroundings and to effects made by humidity, and external forces, vibrations, and other effects. A rigid planar circuit structure has a voltage reference circuit on either side and a temperature sensor on another side of the rigid circuit board. The arrangement includes two flexible connectors, such as flexible circuit boards or flexible flat cables. These can be relatively short in their length. Ceramic materials can be used as a base material in the rigid circuit board, such as alumina. The arrangement enables obtaining accurate outputs from the voltage reference circuit because notable thermal gradients will not be present around sensitive parts of the circuitry.

Inflexible voltage reference circuit card, and method for manufacturing an inflexible voltage reference circuit card

A method of determining a high voltage value without measuring the high voltage value directly, in varying possible temperatures. An apparatus includes two voltage divider circuits (), wherein the second circuit (i.e. a reference circuit) is provided with a smaller reference input voltage (). The transfer ratio can be obtained from the reference circuit () through voltage measurements, and deduced into a transfer ratio of another circuit (), no matter the ambient temperature value. When measuring a divided voltage value () of one circuit (), the desired high voltage value () can be calculated, no matter what the ambient temperature is.

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Pietarsaari, Finland

Hannu Ketonen