The voltage voltage circuit, which can still maintain a constant output voltage circuit when the input voltage, load, ambient temperature, circuit parameters, etc.This circuit can provide a stable DC power supply, which is widely used by various electronic equipment.The basic structure is: adjust the component, the reference voltage circuit, the sampling circuit, and the comparison circuit.
The role of the stabilization circuit
A phenomenon will appear in some circuits, that is, the voltage of DC output will change with the input voltage of the AC market.At the same time, the DC output voltage corresponding to the power circuit will also have certain factors, which is the size of the power circuit load.Generally, if we want to make the input voltage and power load, the influence of the output voltage of the corresponding power supply circuit is reduced to the minimum, and the DC stabilization circuit can generally choose to solve this problem.Compared to the voltage voltage circuit, it can stabilize the output voltage circuit in a specific range.The general voltage voltage circuit has two classifications, one is to AC voltage voltage circuit, and the other is the DC regulatory circuit.The role of the DC stabilization circuit is to stabilize a DC operating voltage output in the filter circuit, which prompts the circuit with a stable voltage of the power circuit.For some failures of the voltage voltage circuit, he may cause the corresponding DC operating voltage of the corresponding power circuit to be extremely unstable.Not only that, it will eventually lead to failure such as output without DC voltage.
Steady -voltage circuit design
Taking the relay as an example, the manual of the model checking device used by the relay used, usually the power of the relays coil will be given in the manual, such as 0.36W. If it is a 12V relay, the current is about 30mA.Experienced engineers may not check the manual and directly design the current design circuit at 50mA.There are also manuals to check the chip and triode.For example, 7812, the input voltage range is minimal of 15V, the maximum is 28V, the load capacity is 500mA, and the static current is 10mA.
Principles of stabilization circuit
The charger generally does not adopt a voltage method, and the method of constant current is to say that the charging current of the battery is within a certain range, and the voltage of the charging is actually changed.The implementation method is to first use a component to sample the charging circuit to obtain the value of the current. After the comparison with the constant value is obtained, the difference becomes the control level signal after analyzing the amplification circuit, and then output to the responsible control current sizePower transistor to control the output current.Ordinary and fast charging should only be the same size of the charging current, and their principles are the same.Of course, some intelligent chargers also have voltage monitoring of the charging battery. When the voltage of the rechargeable battery meets a certain value, it means that when the battery is full, the main charging circuit will be cut off to protect the battery but not charge.

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