초록 ▼

Pulses of such frequency that an electromagnetic drive device does not operate in response thereto are produced by a pulse generating circuit. While these pulse are being applied to the electromagnetic drive device, the voltage of an electrical power source in the real load running state is detected

Pulses of such frequency that an electromagnetic drive device does not operate in response thereto are produced by a pulse generating circuit. While these pulse are being applied to the electromagnetic drive device, the voltage of an electrical power source in the real load running state is detected by a battery checking circuit.

대표청구항 ▼

A battery checking device comprising: (a) a pulse generating circuit for producing pulses with such a frequency that a load does not operate in response thereto; (b) a control circuit capable of supplying current to the load in both directions, said control circuit responsive to a positive pulse sup

A battery checking device comprising: (a) a pulse generating circuit for producing pulses with such a frequency that a load does not operate in response thereto; (b) a control circuit capable of supplying current to the load in both directions, said control circuit responsive to a positive pulse supplying current to the load in one direction, and responsive to negative pulse supplying current to the load in the opposite direction; and (c) a checking circuit for detecting the voltage level of an electrical power source as applied across the load when the aforesaid pulse appears at the control circuit, said checking circuit producing a warning signal when the voltage of the electrical power source falls below a prescribed level. A device according to claim 1, wherein said load is a rotor of an electromagnetically operated shutter.