Thursday, March 5, 2015

Circuit SCR Based SSS Solar Charge Control

Eltronicschool. - Here is Circuit SCR Based SSS Solar Charge Control like in figure 1 below. A force-commutated SCR makes a novel Solid State Switch in a solar charge regulator control. Prior art includes relay and transistor switches, but an SCR switch in this type of DC application may be new to the world (normally SCRs are applied in line-commutated AC applications).

Circuit Schematic



Component List

See all component like in figure 1 above.

Description

Circuit schematic like in figure 1 above is Circuit SCR Based SSS Solar Charge Control. The description about this circuit as follow :

Programmable Unijunction Transistor Gate Drivers

Both the main and commutation SCRs have their gates driven by PUT (Programmable Unijunction Transistor) circuits. Advantages are high gate drive current (100mA peak), fast pulse rise-time and Schmitt Trigger type of operation. Q1 is a free-running oscillator that outputs pulses every 6seconds. Q2 is a similar circuit that is inhibited when the main SCR is blocking (no commutation function needed when the SCR is not conducting). Q2 receives its charge signal from the voltage regulator transistor Q6.

Voltage Reference


A TL431 is strapped to regulate at its minimum voltage of 2.5V. R19 biases it at about 1mA. It is referenced to the positive battery terminal. This is far superior to a low voltage zener because it has very low dynamic resistance and low thermal temperature coefficient.

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