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A simple temperature control of the nickel cadmium rechargea

2015-01-12 12:38  
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This article is to explain a simple temperature control NiCad charging circuit. The circuit is simple but effective. For your more thorough grasp of this principle, we suggest that you can know more about some of the important components of the circuit, such as: 7805,7812,1n5818 . Transformer, bridge rectifier, 1000 uf capacitor provides approximately 22 volts DC power supply to the rest of the circuit. 7812 years of the regulator drops this 12 v Run 311 comparators and 4011 with non-Gates. Press the Start button to start the charging cycle. This leads to two 4011 non-Gates, "Connection" magazine as a rs flip-flop into charging mode. Red LED lit, VMOS FET current switch is turned on. While the battery charging current operation. If the battery starts to warm than the reference temperature, the circuit will not switch to charging mode. Let cool package. When the battery reaches a full charge state, temperature sensor allows the trigger to turn off, turn off the VMOS current switch, lighting the green LED. 7805 Year of the voltage regulator is connected as a constant current regulator. This provides a safe maximum charging current for many different cell types. 500 ohm resistor in VMOS field effect transistor set trickle charge current flows through the battery pack after the completion of the volume. 1n5818 diode prevents packets from unloading if the AC power is turned off. Resistors, diodes and capacitors in the start switch causes the circuit to start automatically when power is first applied. The differential circuit of the temperature sensor by showing two voltage input comparator 311. Comparator output switches on or off depending on which input is at a higher voltage than the other. As a thermistor temperature rises, their resistance drops, reducing the comparator input relevant. Because there are two sensors, the room temperature can be changed and the circuit will react to the temperature difference sensor.



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