An overload situation in an inverter may permanently damage the energy transistor array or burn off the transformer. Some of the home inverters bought in the market don't function an overload shutdown facility, whereas those incorporating this selection come with a ticket.the circuit presented here is an overload detector which shuts down the inverter in an overload situation.
Inverter Overload Protector With Delayed Auto Rest Circuit Diagram
- It shuts down the inverter and additionally provides audio-visual indication of the overload condition.
- after shutdown, it robotically restarts the inverter with a delay of 6 2ds. accordingly, it keeps the consumer from the inconvenience caused due to manually resetting the device or operating round in darkness to reset the gadget at night.
- It permanently shuts down the inverter and proceeds to give audio warning, in case there are more than three successive overloads. Under this situation, the device has to be manually reset.(Successive overload situation point outs that the inverter output is short-circuited or a heavy current is being drawn by using the connected load.)
Inverter Overload Protector With Delayed Auto Rest
The circuit uses an ammeter (0-30a) as a transducer to detect overload situation. Such an am-meter is generally present in almost all inverters. this ammeter is attached between the bad provide of the battery and the inverter, as shown in Fig. 2. the voltage developed throughout this ammeter, due to the glide of current, could be very small. It is amplified by means of IC2, which is wired as a differential amplifier having a gain of 100. IC3 (NE555) is linked as a Schmitt ‘trigger’, whose output goes low when the voltage at its pin 2 exceeds 3.3V. IC4 (again an NE555 timer) is configured as a monostable multivibrator with a pulsewidth of 6 seconds. IC5 (CD4017) is a CMOS counter which depends the three overload stipulations, after which the sys-tem has to be reset manually, through urgent push-to-on change S1. the circuit can be powered from the inverter battery. In standby situation, it devours 8-10 ma of present and round 70 mA with relay (RL1), buzzer (PZ1), and LED1 energised.
Please note the following factors carefully:
- Points A and B on the enter of IC2 should be connected to the corresponding points (A and B respectively) throughout the ammeter.
- Points C and D on the relay terminals have to be related in series with the already existing ‘on’/‘off’ switch leads of inverter as proven in Fig. 1. which method that some of the two leads terminated on the present swap has to be minimize and the cut ends must be connected to the pole and N/O contacts respectively of relay RL1.
- The ammeter must be related in sequence with the bad terminal of the battery and inverter, as shown in Fig. 2.Move the wiper of preset VR1 to the extreme position which is grounded. Switch ‘on’ the inverter. For a three00W inverter, connect about 250-260W of load. Now alter VR1 slowly, unless the inverter simply go again and forths or shuts down. repeat the step if vital. Use good-quality preset with dust cover (e.g. multiturn trimpot) for reliable operation.the circuit can also be simply and success-fully installed with minimum changes to the existing inverter. the entire parts used are low-cost and easily avail-able. the entire circuit is often assembled on a general-purpose PCB. The value of the entire circuit including relay, buzzer, and PCB does not exceed Rs one hundred.
Author : Siddharth Singh - Copyright : EFY Mag
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