Double DC Input Hybrid Energy Charger

The following post describes a simple idea which enables the processing of two different sources of DC inputs derived from different renewable sources.

This hybrid renewable energy processing circuit also includes a boost converter stage which effectively raises the voltage for the required output operations  such as a charging a battery. The idea was requested by one of the interested readers of this blog.

Technical Specifications

hi, i am a final year engineering student, i need to implement a multi input chopper (integrated buck/buck boost converter) for combining two dc sources(hybrid).

i have the basic circuit model, can you help me to design inductor,capacitor values and control circuit for the chopper.

This is the link for multi input chopper.

Simulation and Working.

As shown in the figure the IC555 sections are two identical PWM circuits positioned for feeding the adjoining double input boost converter circuit.

Following functions take place when the shown configuration is switched ON:

DC1 may be assumed as the high DC source such as from a solar panel.

DC2 may be assumed as alow DC input source, such as from a wind turbine generator.

Assuming these sources to be switched ON, the respective mosfets start conducting these supply voltages across the following diode/inductor/capacitance circuit in response to the gate PWMs.

Now since the PWMs from the two stages might beset with different PWM rates, the switching response will also differ depending upon the above rates.

For the  instant when both the mosfets receive positive pulse, both the inputs are dumped across the inductor causing a high current boost to the connected load. The diodes effectively isolate the flow of the respective inputs towards the inductor.

For the instant when the upper mosfet is ON while the lower mosfet is OFF, the lower 6A4 becomes forward biased and allows the inductor a return path in response to the switching of the upper mosfet.
Similarly when the lower moset is ON, and the upper mosfet is OFF, the upper 6A4 provides the required return path for the L1 EMF.

So basically, the mosfets can be turned oN or OFF irrespective of any kind of synchronization making things pretty easy and safe. In any case the output load would receive the average (combined) intended power from the two inputs.

The introduction of the 1K resistor and the 1N4007 diode ensures that the two mosfets never receive separate logic high pulse edge, though the falling edge may be different depending upon the setting of the respective PWMs of the 555 ICs.

The inductor L1 will need to be experimented with in order to get the desired boost at the output. Different number of turns of 22 SWG super enameled copper wire may be used over a ferrite rod or slab, and the output measured for the required voltage.


Solar, Wind Double DC Input Hybrid Energy Battery Charger Circuit


Need Help? Please send your queries through Comments for quick replies!


LaxmanRao said…
I want to des dual input boost converter please help me Dual input boost converter can be used in hybrid energy system
LaxmanRao said…
Please tell or provide me information of dual input boost converter can be used in hybrid energy system
LaxmanRao said…
hello sir i want to design a dual input boost converter for hybrid energy system please suggest me. if it possoble please provide me circuit diagram
Swagatam said…
The referred link in the request given in the above article says that the buck-boost configuration would work with dual inputs. I have only provided the PWM section for the suggested can try it, if it works you could use it for your application.
Swagatam said…
the shown diagram is the final one, cost will depend on your requirement specs.
arjun narendran said…
sir what does 6a4 mean
Swagatam said…
it's the diodes part number.
Azalia Bakhtiar said…
Can you explain how the working principle of the circuit, or can you provide literature or theoretical basis that I can download. I have a job and I could not make a report T.T, plis help me
Azalia Bakhtiar said…
Can you explain how the working principle of the circuit, or can you provide literature or theoretical basis that I can download. I have a job and I could not make a report TT, plis help me
Swagatam said…
Azalia, the article has the all the required explanation, you can modify it and use it for the presentation.
Bob D. said…
Has anybody got this working, tried 2 simulation programs (Circuit Wizard and Yenka) but no luck getting it working.


haq said…
hi sir
i am using 30watt solar penal and 50watt dc wind. is this circuit is compatible with these specs ? can i add the reverse blocking diode 2N4401 in solar and wind for protection??
can it automatically disconnect when battery reach to 14.5.??
what is efficiency of this charge controller.?
haq said…
can i add a relay circuit which disconnect the charge controller when battery reach 14.5 and again connect when battery
11.9 ?
can i use 2N4401 diode instead of 6a4.??
thanks a alot for this efficient work.
Swag said…
Hi Haq, this idea was referred from one of the online datasheet, so I am not sure how the circuit would actually respond, but there's no harm in trying it out
Swag said…
the diode rating will depend on the battery charging rate, make sure it is twice that of the batteries charging rate

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