eHouse Electronic House – Power Home Automation system

Smart Home , Home Automation eHouse is a low voltage control system of the house .
Proper power supply in electronic circuits is always the most important factor of electronic devices , both analog and digital .

In the case of the analog circuit is usually a significant impact on the various types of noise that is generated in the system , which are amplified and reproduced in ever greater extent (this can be seen in all kinds of audio-video equipment ) .
With digital systems and microprocessor influence of the wrong power supply is much larger and can cause equipment malfunctions, system instability, resets and unpredictable effects.
In the case of mixed systems (analog-digital) these effects overlap, causing unpredictable behavior of electronic devices.

To ensure correct operation of a distributed system it is necessary to correct the low-voltage power supply and grounding.
It is essential to a stabilize supply of the required voltage , which is maintained regardless of transients and surges of drawn current. It is also necessary to filter out variable components of the voltage, emerging as a result of disturbances or sudden impulse current.

In addition, a low voltage system must be separated from the external voltages.
This also applies to the supply voltage and the grounds which can not come into contact with other potentials.

The great mistake is to use “ground” (protective conductor) as the ground of the low voltage (0V reference point for electronic circuits), or shorting them together especially in a few points.
At each household wiring conduit 230V ( with a length of a few or several meters ) can accumulate momentary voltage drops of the order of tens of volts ( due to eg. the integration of devices with substantial power { a few or several kilowatts } , which are several times larger than the supply voltages of electronic devices. Such a situation could result in the destruction of the entire plant building automation and other distributed systems like computer networks, audio-video, etc..

It is important to the proper conduct of the signal cable as far away from the interfering signals , transients which may cause considerable noise and measurement errors.

Proper power supply is the first condition for the correct operation of any home automation system including eHouse.

eHouse controllers of electronics home should be connected to a sustained voltage or UPS particular assuring security and boiler room controllers.
Due to the relatively low efficiency of the UPS devices are best performed alone power supply eHouse system Smart Home , intelligent Building .

Although eHouse system is powered from one voltage value (from +12 to + 14V ) is very beneficial to split into two independent power lines:

• power supply with a voltage +12V for microprocessor controllers and possibly relay driver boiler and blinds, gates, security system
• power relay coil windings of voltage without UPS support

The benefits of such power are significant:

• Battery backup controllers operating on a continuous basis
• Battery backup critical relays to be switched on regardless of the voltage loss
• significant energy savings from the battery due to the disconnection of the power relay , that charge a few hundred mW each ( when turned on )
• Separated voltage coils of drivers significantly reduces noise from producing pulses induced in the windings of the coil of the relay.
• Additionally many times increase the life of controller, which are not exposed to very strong pulses, which can frequently exceed maximal power supply voltage of controllers.

Diagram of a simple and effective power Home Automation , Building Automation eHouse , which can be used to power the electronic home.
Such power has the previously mentioned advantages .

The electronic system is simple and inexpensive, in spite of a high level of functionality and efficiency as well as a significant reliability Due to a doubling of switching power supply. In addition, for example, uses a car battery with a high capacity well above the batteries in household devices such as UPS .
Description of the system :
To the system is connected to one or more switching power supply with a voltage of about 13.5V and 200W power (only to power home automation controllers and relays). These power supplies can also be resolved by using a good low-current capacity to supply controllers, a high-current to power the relays .
Switching power supplies are marked on the diagram as V1 and V2 .
V1 is the primary power supply
V2 a backup power supply
They work in parallel and seamlessly ensuring continuity of service in case of failure of one of them.
Voltage power supply provides, which has a higher output voltage.
Voltage power supplies are separated by schotky diodes ensuring you get the three independent functions electrically isolated from each other:

• D1 , D2 , F1 – Providing power to the relays ( non-latching voltage ) .
  F1 = 10A fuse (fuse) provides protection against short-circuit the output of power supplies
• D3 , D4 , L1 – Providing charge battery.
  The battery charging current limited by a halogen bulb up to 50W (max . 5A) .
  At the same time the increase of the current battery voltage is reduced to 0 when the maximum battery voltage.
• D5 , D6 , F2 – Power line of backup power ( for microprocessor controller) .
  F2 fuse prevents damage to the power supply as a result of short-circuit power bus .
  This segment works only for pulse power operation ( AC adapter voltage higher than the battery voltage ) .
  LED D7 prevents uncontrolled charging the battery for the LED D5 , D6 and battery discharge while working at least one of the switching power supply .
• D7 , F3 – power Emergency – with backup battery voltage . Controllers work until the battery voltage drops to approximately 6V .
  Diodes D1 – D6 does not conduct when there is no power from the AC adapter.

Capacitors are used to filter out all of variable voltage components (starting frequency pulse power after reducing the impact of current pulses ) . Capacitors partially offset the sudden noise spikes from the coil of the relay.
LED D8 is protected against over-voltage in the coils of the relays and restricting interference ” voltage pulses ” resulting from the switching circuit for the coil .
Switch S1 is used to turn off the power or reset Hardware (about 1 minute ) .

more : smart home controllers, Drivers of electronic home eHouse lighting Control , heating control , lighting controller , heating controller