Programmable electronic flasher relays
OwnerAndreas Fritzinventor
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Abstract
Method for monitoring a load circuit with an electronic flasher relay. In known methods, the comparison threshold is obtained from a voltage measurement made during operation and stored in a volatile memory in order to record a load element failure. If the load elements malfunction during voltage measurement, incorrect comparison thresholds are defined. In accordance with the method according to the invention, the characteristic values for determining the voltage thresholds are stored in a non-volatile memory before the load circuit commences operation. Thus, no malfunction can occur as a result of incorrectly defined comparison thresholds.
Claims10
Method for monitoring a load circuit with an electronic flasher relay in which the entire load current is taken via a measuring resistor (R1) and in which the voltage drop (V1) which occurs across the measuring resistor (R1) is compared electronically by a control unit (ST), with a voltage threshold (V2) calculated by a check unit (C1) from a characteristic value (V20) according to the applied supply voltage (VS) and with an output signal (A1, A2, AS1, AS2) being generated as the result of the comparison by the control unit (ST)
- wherein
- the characteristic value (V20) which is determined from the total power of the load elements (L) used at a given supply voltage is stored in a nonvolatile memory (M1).
Dependencies are inferred from the claim text.