The action of the capacitance in circuit of brief analyse stabilized voltage reachs application
[introduction] what effect does capacitance have mediumly in stabilized voltage circuit? In the analysis capacitance is in the action in stabilized voltage circuit, it has element of two kinds of electrons, one kind is the capacitance that this chapter will introduce, the grade in the graph is C1, C2, C3; Another kind is LM7805 of integrated circuit of 3 upright stabilized voltage, the grade in the graph is U1. LM7805 is integrated circuit of a kind of 3 upright stabilized voltage, the dc that it can be voltage value 7 ～ 30V inputs signal to turn to be worth the dc signal that is 5V to output for voltage.
What effect does capacitance have mediumly in stabilized voltage circuit? In the analysis capacitance is in the action in stabilized voltage circuit, it has element of two kinds of electrons, one kind is the capacitance that this chapter will introduce, the grade in the graph is C1, C2, C3; Another kind is LM7805 of integrated circuit of 3 upright stabilized voltage, the grade in the graph is U1. LM7805 is integrated circuit of a kind of 3 upright stabilized voltage, the dc that it can be voltage value 7 ～ 30V inputs signal to turn to be worth the dc signal that is 5V to output for voltage.
Capacitance is in the action in stabilized voltage circuit is: Stablize voltage wave motion, make stabilized voltage effect better, ripple is smaller.
A particular case will analyse capacitance below the action in stabilized voltage circuit:
The graph is graph of circuit of a stabilized voltage on, can stabilize output voltage Vo in 5V left and right sides. It has element of two kinds of electrons, one kind is the capacitance that this chapter will introduce, the grade in the graph is C1, C2, C3; Another kind is LM7805 of integrated circuit of 3 upright stabilized voltage, the grade in the graph is U1. LM7805 is integrated circuit of a kind of 3 upright stabilized voltage, the dc that it can be voltage value 7 ～ 30V inputs signal to turn to be worth the dc signal that is 5V to output for voltage.
Capacitance C1, C2, C3 has filter wave effect, capacitance C1 can filter gets rid of the low frequency noise that overlay is inputting signal to go up, capacitance C2 can filter gets rid of the high frequency noise that overlay is inputting signal to go up, capacitance C3 can filter gets rid of overlay the high frequency noise on output signal.
To the graph 2 shown circuit undertake emulation, among them the capacity of capacitance C1, C2, C3 is 100μF, 0.1μF, 0.1μF respectively, input + the dc signal of 12V, use two volmeter to observe an input / the result of output.
Can see, through the stabilized voltage of LM7805, see from volmeter U3 output voltage is about + 5V. If input signal overlay to noise can be filtered by capacitance, and dc signal was not continued to flow ahead by the influence, as if without capacitance this spur track.