Editor’s notice: This design thought presents an answer to the frequent difficulty of a TV routinely restarting after an influence outage. Oftentimes, energy could also be restored when the patron shouldn’t be current and unknowingly left operating. This may very well be as a result of a number of causes, together with the HDMI-CEC settings on the TV or just an automated restore manufacturing facility setting. Whereas it a helpful setting to have enabled, it might be useful to make sure the TV is not going to be routinely turned on when energy is restored after an influence outage.

Introduction

Current day TV designers take ample care in energy provide design such that TV comes “ON” routinely after an influence shut down and resumption, if TV was “ON” earlier than energy shut down. If the TV was “OFF” earlier than energy shut down, it continues to be “OFF”, even after energy resumption. This is a wonderful characteristic; one can proceed to look at TV after a quick shut down and resumption with none guide intervention.

At instances, this will result in sure inconveniences in case of lengthy energy shutdowns. The final time this occurred to us, we had been watching TV, and the facility all of the sudden went off. Sooner or later throughout this energy outage, we needed to depart and got here again house after two days. The ability might have resumed a couple of hours after we left. Nevertheless, as per its design, the TV turned “ON” routinely and was “ON” for 2 days. This induced discomfort to neighbors till we returned and switched the TV off. What a disturbance to others!

Wow the engineering world along with your distinctive design: Design Concepts Submission Information

TV power-ON assist

I designed the “TV Energy-ON assist” gadget in Determine 1 to beat this downside. Mains energy is fed to this gadget. Energy is fed to the TV by this gadget. As soon as the SW1 swap/button is pushed, the TV receives energy, so long as mains energy is there. If energy goes “OFF” and resumes inside say, a half hour, the TV will obtain energy from the mains with none guide intervention, like the unique design. If the facility resumes after a half hour, the place it’s probably you will not be close to the TV at the moment, the facility is not going to be prolonged to TV routinely. As an alternative, you’ll have to push the button SW1 as soon as to feed energy to TV. This gadget saves us from inflicting discomfort to the neighbors from an unattended TV blasting exhibits: an issue anyone can face throughout a protracted energy outage when he/she was not current in the home.

Determine 1 TV power-ON assist circuit. Join mains energy to J1. Take energy to TV from J2. Join energy provide pins of U2, U3, and U4 to V1. The grounds of those ICs have to be related to the minus aspect of the battery. These connections aren’t proven within the picture.

Circuit description

The primary time, you’ll have to press momentary push button SW1 as soon as. Relay RL2 will get energized and its “NO” contact closes, shorting SW1. Therefore, the relay continues to be “ON” and energy is prolonged to TV.

When mains energy goes off, RL2 relay de-energizes. By way of the “NC” contact of relay RL2, the battery (3X 1.5 V alkaline batteries) turn out to be related to the OFF-delay timer circuit shaped by U1(555), U2 (4011), U3 (4020), and U4(4017). As quickly because the battery will get related, this circuit switches “ON” the relay RL1 by MOSFET Q1 (IRLZ44N). Its “NO” contact closes and shorts SW1.

The timer circuit holds this relay for about a half hour. (The time will be adjusted by appropriate choice of C2). If energy resumes on this half an hour interval, since SW1 is shorted by RL1contact, the facility will get fed to TV routinely. If the facility resumes after a half hour, since RL1 will get de-energized as a result of OFF-delay timer motion, its contact which is related throughout SW1, is opened and energy shouldn’t be prolonged to TV. It is a protected situation. Once you come again, you may push the button SW1 to feed energy to TV. The RL1 coil voltage is 5 V and the voltage of RL2 is both 230 V AC or 110 V as wanted.

The U1 circuit works as an oscillator. The U3 circuit works as frequency divider. This frequency is counted by U4 circuit. When time delay reaches round half-hour, its Q9 goes excessive. Therefore U2C output goes “LO” and RL1 will get de-energized. Each time energy goes off, timer circuit will get battery voltage by “NC” contact of RL2. When energy resumes, battery is disconnected from timer circuit, thus saving battery energy. A Lithium-ion battery and charger circuit will be added instead of alkaline batteries, if desired.

Jayapal Ramalingam has over three many years of expertise in designing electronics methods for energy & course of industries and is presently a contract automation marketing consultant.

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The publish Sensible TV power-ON assist appeared first on EDN.

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