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Power Control Circuits

Automatic Control Starts Loads Softly: 10/13/94 EDN-Design Ideas

Automatic Power off Circuit Saves Battery: 12/05/96 EDN-Design Ideas

Build a UPS for USB devices: 04/11/2002  EDN - Design Ideas / Portable systems often include circuitry that derives power from an external source, such as USB. When the system disconnects from the USB supply, a battery takes over and supplies current via a dc/dc converter. A diode-OR connection (Figure 1.

Circuit Automates Switch over Between Battery & Source: 12/12/97 EDN-Design Ideas

CMOS Gate implements Reverse Phase Control: 05/21/98 EDN-Design Ideas

Cockcroft Walton  Multiplier:

Controller Provides Constant Power DC Load: 03/14/96 EDN-Design Ideas

Isolated Driver Forms Solid State Circuit Breaker: 03/03/98 EDN-Design Ideas / This circuit allows standard TTL logic levels to safely drive a high-power dc load, circuit provides also overcurrent circuit breaker functionality

Load Switcher Draws only 6 A: 07/04/96 EDN-Design Ideas

Microcontroller Watches, Controls AC Power: 06/22/95 EDN-Design Ideas / circuit allows an isolated microcontroller to both sense and control ac power to an externally plugged-in device

Novel Circuit Controls AC Power: 01/07/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

Power source is insensitive to load changes: 04/04/2002  EDN - Design Ideas / For the heating and cooling elements common in industrial systems, resistance is not a fixed quantity. These elements include such devices as positive-temperature-coefficient heaters and thermoelectric coolers. Their resistance can change more than 100% during operation, and the result is a change in power dissipation for elements receiving drive from a fixed voltage or current source. .

Pushbutton Switch Controls Power Supply & C: 09/25/97 EDN-Design Ideas

Short dc power line pulses afford remote control: 10/25/2001 EDN - Design Ideas /  If you face the challenge of adding a second, independently controlled light source to an existing ceiling lamp controlled by a wall switch, you may find that stringing a second power line is impossible. First, you can replace the wall switch by the circuit in Figure 1. Pushing the on switch S1 or S2 for approximately 1 sec inserts the 12V zener diodes D1 or D2 in series with the ... .

Smart Switch Cuts Transformer turnon Current : 04/23/98 EDN-Design Ideas

Soft Start Circuit for Power Amps:

Soft start controller is gentle on loads: 11/22/2001 EDN - Design Ideas / The control circuit in Figure 1 senses a given load and automatically soft-starts the load by synchronously adjusting the power to that load. You can also manually adjust the power delivered to the load by controlling the phase angle of the line voltage across the load. The phase-angle adjustment for every ac half cycle covers 0 to 180 . .

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