초록 ▼

A power supply has both high and low voltage power sources connected to a common output terminal. A switching circuit is connected between the high voltage source and this terminal, the switching circuit being controlled by a control circuit. The control circuit operates in response to malfunction a

A power supply has both high and low voltage power sources connected to a common output terminal. A switching circuit is connected between the high voltage source and this terminal, the switching circuit being controlled by a control circuit. The control circuit operates in response to malfunction and temperature sensors when these sensors have outputs indicative of equipment operating conditions outside of predetermined ranges for each of the sensed parameters. When the control circuit is not being actuated by an output from one of the sensors, the switching circuit is actuated to connect the high voltage output to the output terminal. In the event, however, that one of the temperature or malfunction sensors senses a condition outside of range, the control circuit is actuated, thereby deactuating the switching circuit to remove the high voltage output from the output terminal, leaving low voltage output. The control circuit operates in conjunction with a timer-reset circuit which resets the control circuit cyclically after a predetermined timing cycle. With each resetting, the control circuit will be reactuated by one of the sensors only if an out-of-range condition still exists. However, if after any resetting of the control circuit, there no longer is an out-of-range parameter being sensed, the control circuit will remain deactuated so as to restore high voltage output.

대표청구항 ▼

In a power supply for supplying power to a load, means for automatically reducing the power supplied to said load in the event that the value of at least one operating parameter of the power supply or load goes beyond a predetermined acceptable limit comprising: means for generating “high”and “low”v

In a power supply for supplying power to a load, means for automatically reducing the power supplied to said load in the event that the value of at least one operating parameter of the power supply or load goes beyond a predetermined acceptable limit comprising: means for generating “high”and “low”voltage outputs, said low voltage output being connected directly to the load, switching circuit means interposed between the high voltage output and the load, means for sensing the value of said operating parameter and providing a signal in accordance therewith, control circuit means connected to receive the output of said sensing means for operating the switching means so as to disconnect the high voltage output from the load whenever said operating parameter is beyond said predetermined limit, and timer-reset circuit means having a timing cycle which is initiated in response to the output of the control circuit means for cyclically actuating the control circuit means so as to cause the high voltage output to be connected to the load whereby if said parameter is still beyond said limit, the control circuit means will again operate the switching circuit means to remove the high voltage from the load.