Wuxi New District Jincheng Electric Co

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What is obtained after rectification is pulsating DC. If filtering is added The circuit filters out the AC component in the pulsating DC power and obtains smooth DC power.
Capacitor filtering: Connect the capacitor and the load in parallel. The capacitor is charged during the positive half cycle and discharged during the negative half cycle, so that smooth DC power can be obtained on the load.
Inductor filtering: Connecting the inductor and the load in series, as shown in Figure 3(b), can also filter out the AC component in the pulsating current.
Filtering: A filter circuit composed of an inductor and a capacitor is called a type, 3(), because it looks like an upside-down letter. The filter circuit using an inductor and a capacitor is called a filter circuit because it looks like a letter. This is a circuit with better filtering effect.
R filtering: Inductors have high cost and large size, so in electronic circuits with low current, resistors are often used to replace inductors to form R filter circuits. Likewise, it also has type, type 3, type 3.
Voltage Stabilizing Circuit
Fluctuations in AC grid voltage and changes in load current will cause the output voltage and current of the rectified power supply to change accordingly. Therefore, electronic circuits with higher requirements must use a regulated power supply.
Parallel voltage stabilizing circuit with voltage stabilizing tube: A circuit using a voltage stabilizing tube connected in parallel with the load is the simplest voltage stabilizing circuit. R in the figure is the current limiting resistor. The output current of this circuit is very small, and its output voltage is equal to the stable voltage value of the voltage regulator tube.
Series voltage stabilizing circuit: A series voltage stabilizing circuit with amplification and negative feedback is the most commonly used voltage stabilizing circuit. Its circuit and block diagram (b), (). It detects changes in the output voltage from the sampling circuit (RR), compares it with the reference voltage, amplifies it through an amplifier, and then adds it to the adjustment tube, so that the voltage at both ends of the adjustment tube changes accordingly. If the output voltage drops, the voltage drop of the regulating tube also decreases, so the output voltage is increased. If the output voltage rises, the voltage drop of the regulating tube also rises, so the output voltage is depressed, and the output The voltage remains basically unchanged. On the basis of this circuit, many modified circuits have been developed or some auxiliary circuits have been added, such as using composite tubes as adjustment tubes, circuits with adjustable output voltages, circuits using operational amplifiers as comparative amplification, and adding auxiliary power supplies and over
Current protection circuit, etc.
Switching-type voltage stabilizing circuit: A new type of voltage-stabilizing power supply that has been widely used in recent years is the switching-type voltage-stabilizing power supply. Its adjustment tube works in a switching state, and its power consumption is very small, so it has the advantages of high efficiency and small size, but the circuit is relatively complicated.
There are many types of switching regulated power supplies in principle. It's basic principle box BB inverter repair. The inductor and capacitor in the figure are energy storage and filtering components, and the diode is a freewheeling diode that provides a current path for the filter and the regulator tube when it is in the off state. The switching frequency of the switching regulated power supply is very high, generally several to tens of kilohertz, so the inductor is not very large and there are not many high-order harmonics in the output voltage.
Its basic working principle is: the sampling voltage is detected from the sampling circuit (RR) and then compared and amplified to control a rectangular wave generator. The output pulse of the rectangular wave generator controls the turn-on and cut-off time of the regulating tube. If the output voltage decreases due to changes in the grid voltage or load current, the output pulse of the rectangular wave generator will become wider, so the conduction time of the regulating tube will increase, allowing the energy storage circuit to obtain more energy. , the result is that the output voltage is increased and the purpose of stabilizing the output voltage is achieved.
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