Hi,
I'm doing a project based on the following circuit. I really need some help analyzing this circuit!!! I'm not too familiar with power electronics.
Basically this circuit is suppose to control the operation of solenoids, a pump and a heater from a microprocessor. Here's what I figured out so far. They are controlled from the microprocessor outputs "heater, pump, sol, sol". These outputs enable the triac drivers (u8, u7, u2, u1), if the outputs of the triac drivers are out of phase, the driver is activated which enables the gate of the triac gate. Varistors are placed in parallel to protect the triac from current surges. The RC networks act as snubbers to the triac.
What i don't understand is that shutdown circuit. It's suppose to disable the pump and the heater. They are deactivated when a thermostat is opened or from a command from the microprocessor via "out". If it was deactivated from the thermostats then this circuit lets the microprocessor via "in". How do the components in this circuit makes this happen?
Thank you,
Pete
I'm doing a project based on the following circuit. I really need some help analyzing this circuit!!! I'm not too familiar with power electronics.
Basically this circuit is suppose to control the operation of solenoids, a pump and a heater from a microprocessor. Here's what I figured out so far. They are controlled from the microprocessor outputs "heater, pump, sol, sol". These outputs enable the triac drivers (u8, u7, u2, u1), if the outputs of the triac drivers are out of phase, the driver is activated which enables the gate of the triac gate. Varistors are placed in parallel to protect the triac from current surges. The RC networks act as snubbers to the triac.
What i don't understand is that shutdown circuit. It's suppose to disable the pump and the heater. They are deactivated when a thermostat is opened or from a command from the microprocessor via "out". If it was deactivated from the thermostats then this circuit lets the microprocessor via "in". How do the components in this circuit makes this happen?
Thank you,
Pete