초록 ▼

A regulated power supply for application in a cable signal distribution amplifier comprises a filter, voltage doubler and current sense transformer controlled by a control technique known in the art. In the event of a high impedance short condition causing severe overcurrents, the known control tech

A regulated power supply for application in a cable signal distribution amplifier comprises a filter, voltage doubler and current sense transformer controlled by a control technique known in the art. In the event of a high impedance short condition causing severe overcurrents, the known control technique is ineffective. To alleviate the problem, a high impedance current fault control circuit includes a sampling circuit, a level adjusting circuit, a differential amplifier for providing a monitor output control voltage and a buffer circuit to the controller. In the event of a high impedance current fault, the control circuit kicks in and interrupts controller operation saving power supply components from damage caused by the overcurrent condition.

대표청구항 ▼

[ What I claim is:] [1.] A regulated power supply comprising a filter, voltage doubler and current sensing transformer, the power supply regulated by a controller, the improvement comprising:a sampling circuit for sensing an output over current condition via a monitored voltage drop, wherein the sam

[ What I claim is:] [1.] A regulated power supply comprising a filter, voltage doubler and current sensing transformer, the power supply regulated by a controller, the improvement comprising:a sampling circuit for sensing an output over current condition via a monitored voltage drop, wherein the sampling circuit comprises a resistor having first and second terminals;a level adjusting circuit coupled to the sampling circuit for adjusting the level of the monitored voltage drop, the level adjusting circuit comprising a first input coupled to the first terminal of the resistor of the sampling circuit; a second input coupled to the second terminal of the resistor of the sampling circuit; a first processing circuit coupled to the first input for generating a first output; the first processing circuit comprises first and second diode connected transistors; and a second processing circuit coupled to the second input for generating a second output;a differential amplifier, coupled to outputs of the level adjusting circuit, for providing a monitor output voltage, wherein the differential amplifier comprises a first input coupled to the first output of the level adjusting circuit, a second input coupled to the second output of the level adjusting circuit; and an output for providing the monitor output voltage; anda buffer circuit connected to the output of the differential amplifier for interrupting controller operation to thereby interrupt current flow at an output of the regulated power supply.