Page 115 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

An on-line design offers the greatest degree of critical supply integrity as the load can be always supplied with
processed power. The rectifier and inverter block mains borne noise and voltage transients as well as providing
a well-regulated output voltage.

For this protection to be valuable, the UPS configuration must offer very high availability and resilience to failure.
These attributes can be achieved using modern transformer less technology and the size, weight and energy
savings it facilitates.
Precautions:
For UPS battery replacement, only professional electricians are allowed to do so.
Do not burn the battery. It may damage the surroundings.
Uninterruptible power supply maintenance should be observed regularly to avoid interruptions and damage while
using it.
UPS contains hazardous chemicals inside. ...
UPS should be only installed by qualified electricians.
Avoid placing your UPS in outdoor areas.

UPS CIRCUIT:

UPS Circuit is formed by modifying the inverter circuit. Different Types of circuits can be used by different
manufactures, but the basic principle will not change. The following types of sub-circuits are used to form a UPS
circuit.
Power Circuit:
Distribution and control circuit of input supply is called power circuit. The input supply is usually 230 V, 50 HZ
single phase AC (in India).
Generally, this supply voltage fluctuates between 210V to 250v. Therefore, a voltage stabilizer circuit is incorporated
in UPS. This circuit provides 230v AC output. This stabilizer voltage is supplied to the computer monitor, etc.
Inverter Circuit:
Inverter circuit is used to prepare 230V AC from 12V battery. For this purpose, some devices such as battery
charging circuit, overcharging protection circuit, low battery indicator and changeover devices are incorporated
in inverter circuit.
2051 Microcontroller:
The 2051 is a 20 Pin version of the 8051 MC. It is a low voltage, high performance CMOS- 8-bit Microcomputer
with 2K bytes of flash programmable and erasable read-only memory. It provides a very flexible, cost-effective
solution to many embedded control applications. The Pin layout of 2051 Mc is shown below.

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CITS : E & H - Electronics Mechanic - Lesson 56 - 63