452
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PWM (Pulse Width Modulation)PWM
PWMPWM PWM PWM
VD 1PWM1 PWM-VT
VD 1PWM1 PWM-VT
VD UsCVT Ug1PWM1 PWM-VT
1PWM1 VT ()Ug
1PWM1 VT ()Ug
1PWM1 T 0 t < tonUgVTVT ton t < T UgVTVD
1PWM1 T 0 t < tonUgVTVT ton t < T UgVTVD
1PWM
1PWM
1PWM
1PWM PWM
VT1 + id VT2 id Ud 1PWM2
1PWM 2 VT1
1PWM 2 VT1
1PWM 2 ()
1PWM tonVT10 t ton Ug1VT1 Ug2VT2Us id
1PWM ton < t T Ug1Ug2VT1VT2idVD2VD2VT2 VT1VD2
1PWM ton < t T Ug1Ug2VT1VT2idVD2VD2VT2 VT1VD2
1PWM
1PWM
1PWM 1VD1 id 2VT1 id
1PWM 3VD2 id 4VT2 id
1PWM 3VD2 id 4VT2 id
1PWM 14 23
1PWM 14 23
1PWM VT2
1PWM VT2
1PWM
1PWM
1PWM 0 t ton VT2 id VD1 VD1 VT1
1PWM ton t T Ug2 VT2 id VT2VD1VT1
1PWM ton t T Ug2 VT2 id VT2VD1VT1
1. PWM: : = ton / T PWM 0 < 1 Ud = Ud / UsPWM PWM =
PWMPWMPWM 1.PWM2.PWM
2.PWM PWMH M
2.PWM PWMPWM PWMPWM
2.PWM PWMPWM
2.PWM 1 Ug1=-Ug2 12
2.PWM 1 1 234
2.PWM1 () 1 0 t ton Ug1 Ug4 VT1 VT4 Ug2 Ug3VT2 VT3 id 1()MUAB = +Us 1
2. PWM1 () 2ton t T Ug1 Ug4 VT1 VT4 VD2 VD3 VT2 VT3 id 2()MUAB = Us 12
2. PWM1 ()
2. PWM 1 () 34
2. PWM 1 PWM
= 2 1 =
2. PWM 1 PWM
=
2. PWM 1
2. PWM 1 () PWM1:20000
2.PWM 1 () 4
2.PWM2 PWM T
2.PWM2 PWM
2. PWM2Ug4 Ug3VT1 VT2
2. PWM 2 Ug4 Ug3VT1 VT2
2. PWM 2 Ug4 Ug3VT1 VT2
2. PWM 2) Ug4 Ug3VT1 VT2
1. PWMPWM
1. PWMPWM
1.
PWMPWM
PWMPWM
1.
PWMPWM
PWMPWM
2. PWM
2. PWM
2.
TS T 20kHz T = 0.05ms
PWMR
1.PWMR ACRUctPWMUct (1) (2) (3) (4)
1.PWMR PWMSG152525253525PWMSG1731SG 2731SG 3731 10K~350KHzSG1731 55~+125 SG 2731 25~+85 SG 3731 0~+70 PWM
1.PWMRPWMR H
1.PWMRPWMR H
1.PWMR PWMR
1.PWMR PWMR
1.PWMR PWMR
P247411