| 摘要 |
A cutoff switch (40) separates the reference line (20) of a control circuit (18) from the B- line (24). The cutoff switch is in an electrically open state until the function of the control circuit is required, thus eliminating current flow through the control circuit when the function of the control circuit is not required. To enable the control circuit, a threshold switch (42) is provided to cause the cutoff switch to change states when the battery voltage reaches a predetermined level. To provide an override, a diode is connected between an auxiliary line (26), used a thermistor (28), for example.
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