请教下图输出电压的峰峰值

皋城瑶珄

本人菜鸟，不会计算，请高手帮忙算算下图输出电压的峰峰值，谢谢。

皋城瑶珄

这个图

路遥plus

这个图
皋城瑶珄 发表于 2012-11-12 15:58

采用简单计算：Out Vpp大约106V，Vrms大约37V

mld

回复 3# 路遥plus

路版采用简单计算竟与模拟仿真相同！

1. 6V6GT
   
2. Beam Power Amplifier
   
3. EIA Base & Outline
   
4. 
   
5. Substitute Data
   
6. Preferred Substitutes ......................... 7408
   
7. Substitutes ................................... 1614
   
8. -------------------------------
   
9. Application
   
10. -------------------------------
    
11. Glass octal type used as output amplifiers in automobile, battery-operated, and other receivers in which reduced plate-current drain is desirable. Requires octal socket and may be mounted in any position.
    
12. -------------------------------
    
13. It is equivalent in performance to type 6AQ5. Refer to type 6AQ5 for characteristic curves.
    
14. Mechanical Data
    
15. 
    
16. -------------------------------
    
17. Bulb .......................................... T-9
    
18. Base Type ..................................... Int or short Int Octal
    
19. EIA Outline ................................... 9-11 9-41
    
20. EIA Base ...................................... 7S
    
21. Mounting Position ............................. Any
    
22. Electrical Data
    
23. 
    
24. -------------------------------
    
25. Heater Voltage ................................ 6.3 V
    
26. Heater Current ................................ 0.45 A
    
27. Maximum Heater-Cathode Voltage
    
28.   Heater Positive with Respect to Cathode
    
29.     DC Component .............................. 90 V
    
30.   Heater Negative with Respect to Cathode
    
31.     DC Component .............................. 90 V
    
32. Direct Interelectrode Capacitances (approx)
    
33. Pentode
    
34. -------------------------------
    
35. Input ......................................... 9.5 pf
    
36. Output ........................................ 7.5 pf
    
37. Grid to Plate ................................. 0.7 pf
    
38. Maximum Ratings (Design Center Values)
    
39. Pentode
    
40. -------------------------------
    
41. Plate Voltage ................................. 315 V
    
42. Grid No. 2 Voltage ............................ 285 V
    
43. Plate Dissipation ............................. 12 W
    
44. Grid No. 2 Dissipation ........................ 2 W
    
45. Characteristics and Typical Operation
    
46. Class A Amplifier
    
47. -------------------------------
    
48. Plate Voltage ................................. 180 V
    
49. Grid No. 2 Voltage ............................ 180 V
    
50. Grid No. 1 Voltage ............................ -8.5 V
    
51. Peak Grid No. 1 Voltage........................ 8.5 V
    
52. Plate Resistance (approx) ..................... 58K Ω
    
53. Transconductance .............................. 3700 ?
    
54. Plate Current (Zero Signal) ................... 29 mA
    
55. Plate Current (Maximum Signal) ................ 30 mA
    
56. Grid No. 2 Current (Zero Signal) .............. 3 mA
    
57. Grid No. 2 Current (Maximum Signal) ........... 4 mA
    
58. Load Resistance ............................... 5.5K Ω
    
59. Power Output (approx) ......................... 2 W
    
60. Total Harmonic Distortion ..................... 8 %
    
61. Class A Amplifier
    
62. -------------------------------
    
63. Plate Voltage ................................. 250 V
    
64. Grid No. 2 Voltage ............................ 250 V
    
65. Grid No. 1 Voltage ............................ -12.5 V
    
66. Peak Grid No. 1 Voltage........................ 12.5 V
    
67. Plate Resistance (approx) ..................... 52K Ω
    
68. Transconductance .............................. 4100 ?
    
69. Plate Current (Zero Signal) ................... 45 mA
    
70. Plate Current (Maximum Signal) ................ 47 mA
    
71. Grid No. 2 Current (Zero Signal) .............. 4.5 mA
    
72. Grid No. 2 Current (Maximum Signal) ........... 7 mA
    
73. Load Resistance ............................... 5K Ω
    
74. Power Output (approx) ......................... 4.5 W
    
75. Total Harmonic Distortion ..................... 8 %
    
76. Class A Amplifier
    
77. -------------------------------
    
78. Plate Voltage ................................. 315 V
    
79. Grid No. 2 Voltage ............................ 225 V
    
80. Grid No. 1 Voltage ............................ -13 V
    
81. Peak Grid No. 1 Voltage........................ 13 V
    
82. Plate Resistance (approx) ..................... 77K Ω
    
83. Transconductance .............................. 3750 ?
    
84. Plate Current (Zero Signal) ................... 34 mA
    
85. Plate Current (Maximum Signal) ................ 35 mA
    
86. Grid No. 2 Current (Zero Signal) .............. 2.2 mA
    
87. Grid No. 2 Current (Maximum Signal) ........... 6 mA
    
88. Load Resistance ............................... 8.5K Ω
    
89. Power Output (approx) ......................... 5.5 W
    
90. Total Harmonic Distortion ..................... 12 %
    
91. Class AB1 Amplifier
    
92. -------------------------------
    
93. Plate Voltage ................................. 250 V
    
94. Grid No. 2 Voltage ............................ 250 V
    
95. Grid No. 1 Voltage ............................ -15 V
    
96. Peak Grid No. 1 Voltage........................ 30 V
    
97. Plate Resistance (approx) ..................... 60K Ω
    
98. Transconductance .............................. 3750 ?
    
99. Plate Current (Zero Signal) ................... 70 mA
    
100. Plate Current (Maximum Signal) ................ 79 mA
     
101. Grid No. 2 Current (Zero Signal) .............. 5 mA
     
102. Grid No. 2 Current (Maximum Signal) ........... 13 mA
     
103. Load Resistance ............................... 10K Ω
     
104. Power Output (approx) ......................... 10 W
     
105. Total Harmonic Distortion ..................... 5 %
     
106. Class AB1 Amplifier
     
107. -------------------------------
     
108. Plate Voltage ................................. 285 V
     
109. Grid No. 2 Voltage ............................ 285 V
     
110. Grid No. 1 Voltage ............................ -19 V
     
111. Peak Grid No. 1 Voltage........................ 38 V
     
112. Plate Resistance (approx) ..................... 65K Ω
     
113. Transconductance .............................. 3600 ?
     
114. Plate Current (Zero Signal) ................... 70 mA
     
115. Plate Current (Maximum Signal) ................ 92 mA
     
116. Grid No. 2 Current (Zero Signal) .............. 4 mA
     
117. Grid No. 2 Current (Maximum Signal) ........... 13.5 mA
     
118. Load Resistance ............................... 8K Ω
     
119. Power Output (approx) ......................... 14 W
     
120. Total Harmonic Distortion ..................... 3.5 %
     
121. Class C Amplifier/Oscillator
     
122. -------------------------------
     
123. Plate Voltage ................................. 300 V
     
124. Grid No. 2 Voltage ............................ 200 V
     
125. Grid No. 1 Voltage ............................ -45 V
     
126. Grid No. 1 Current ............................ 2.5 mA
     
127. Plate Current ................................. 60 mA
     
128. Grid No. 2 Current ............................ 7.5 mA
     
129. Driving Power ................................. 0.3 W
     
130. Power Output (approx) ......................... 12 W
     
131. Class C Modulated Amplifier (Plate)
     
132. -------------------------------
     
133. Plate Voltage ................................. 250 V
     
134. Grid No. 2 Voltage ............................ 200 V
     
135. Grid No. 1 Voltage ............................ -45 V
     
136. Grid No. 1 Current ............................ 2 mA
     
137. Plate Current ................................. 60 mA
     
138. Grid No. 2 Current ............................ 6 mA
     
139. Driving Power ................................. 0.4 W
     
140. Power Output (approx) ......................... 10 W

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6V6推动电路


输出电压


输入阻抗


输出阻抗

皋城瑶珄

回复 3# 路遥plus

谢谢路版，如果需要输出峰峰值170V，电路还需要做哪些调整？

皋城瑶珄

回复 4# mld
谢谢，再麻烦兄弟帮忙算下如果供电350V，屏极负载、阴极电阻多大能输出峰峰值170V？

mld

回复 6# 皋城瑶珄

你要的这个170Vp-p值应该闭环考虑才是，单元电路在插入系统后情况会很不一样的...

波形图：


电路图：


测试值：

1. 
   
2. Harmonic  Frequency         Fourier         Normalized         Phase          Normalized
   
3. Number   [Hz]           Component         Component        [degree]        Phase [deg]
   
4.     1   1.000e+03        8.616e+01        1.000e+00         -179.61°        0.00°
   
5.     2   2.000e+03        3.270e-01        3.795e-03           90.37°      269.97°
   
6.     3   3.000e+03        2.712e-02        3.148e-04         -178.39°        1.22°
   
7.     4   4.000e+03        2.286e-03        2.653e-05          -44.46°      135.15°
   
8.     5   5.000e+03        6.265e-03        7.272e-05            2.41°      182.01°
   
9.     6   6.000e+03        1.190e-03        1.381e-05          -17.19°      162.42°
   
10.     7   7.000e+03        2.815e-03        3.267e-05         -174.34°        5.26°
    
11.     8   8.000e+03        7.763e-04        9.010e-06           12.41°      192.02°
    
12.     9   9.000e+03        3.535e-03        4.103e-05            4.26°      183.87°
    
13. Total Harmonic Distortion: 0.380953%
    
14. ------------------------------------------
    
15. v_in: PP(v(in))=21.9945 FROM 0 TO 0.005
    
16. v_out: PP(v(out))=172.323 FROM 0 TO 0.005

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路遥plus

回复  路遥plus

路版采用简单计算竟与模拟仿真相同！6V6推动电路


输出电压


输入阻抗 ...
mld 发表于 2012-11-13 14:18

呵呵，因为LZ的电路已经给出屏流，我就偷偷懒，用下式估算:

Vo= 15mA x 10K x 25%=37.5Vrms   

Vpp=37.5Vrms x 2.828=106Vpp

如果效率按27.5%算，那就真的与仿真数值差不多一样了：
Vo=15 x 10 x 27.5%=41.25Vrms = 116.65Vpp

取25%虽然保守了些，但输出信号失真度相对就小些。

mld

...因为LZ的电路已经给出屏流，我就偷偷懒，用下式估算:
Vo= 15mA x 10K x 25%=37.5Vrms   
Vpp=37.5Vrms x 2.828=106Vpp
如果效率按27.5%算，那就真的与仿真数值差不多一样了：
Vo=15 x 10 x 27.5%=41.25Vrms = 116.65Vpp
取25%虽然保守了些，但输出信号失真度相对就小 ...
路遥plus 发表于 2012-11-14 04:07

这些都是以前学过的，看来我得回头恶补...

皋城瑶珄

回复 8# 路遥plus


  那计算出的116V峰值，是否和下图的动态阻容曲线图Q点是一样的？

皋城瑶珄

回复 9# mld
请老兄看看

用这个图来推单端300B的，该300B栅负压为-85V/屏流80MA，经过下图红线改动后推300B有无问题？

【6J8P阴极加了旁路电容】【6P6P推动改成400V电压供电】

峰值改成175VP-P/20MA/栅负压-16V

路遥plus

回复  路遥plus


  那计算出的116V峰值，是否和下图的动态阻容曲线图Q点是一样的？
皋城瑶珄 发表于 2012-11-14 17:09

是的.

皋城瑶珄

回复 12# 路遥plus

请斑竹看看这张图骑马6N8VPP是否能推动11楼的300B,

画红圈是推动部分，该极Vrms  和VPP 分别为多少？

路遥plus

回复  路遥plus

请斑竹看看这张图骑马6N8VPP是否能推动11楼的300B,

画红圈是推动部分，该极Vrms  和 ...
皋城瑶珄 发表于 2012-11-14 21:05

这个SRPP推动电路所标的阴极电压应该是错的（1.7V/4.7K=0.36mA???)，实际上应该是1.3mA左右才对。

这个电路大约可以输出75Vrms即210Vpp左右。应该可以推得动后面的300B，但推得好不好就要试过先知。

皋城瑶珄

回复 14# 路遥plus

请教版主这个骑马咋算的？

RK1/RK2是4.7K，其他咋算？？？？？？？？？？？？

    阴极电阻
RL = 负載（SRPP为定负载）
Rk1 = Rk2 = (2RL+ ra) / mu
靜態电流
Iq = HT / (2ra + 2muRk)
输出阻抗
Zout = (ra + 2Rk)[ra+Rk(mu+2)] / [2ra + 2Rk (mu + 2)]

放大量:
∵ 2Iq  ←  每管
    2(2Iq)RL = Eo（输出）
       2IqRk = Ei（输入）
∴ A = Eo / Ei

电压方面尽量靠近最大工作点






下面是另位版主算式，俺贴过来没有图摸不清楚咋算骑马推动？？？？？？？？？？？

阴极电阻
RL = 68KΩ = Rg（300B）
Rk1 = Rk2 = (2RL+ ra) / mu
Rk1 = Rk2 = (2*68KΩ+44KΩ)/70 = 2.57KΩ
* * 或用上面方法定 Rk，如: 1.8KΩ
靜態电流
Iq = HT / (2ra + 2muRk)
Iq = 500V/(2 x44K+2x70*2.57) = 1.12mA
* * Iq = 500V/(2 x44K+2x70*1.8K) = 1.47mA
输出阻抗
Zout = (ra + 2Rk)[ra+Rk(mu+2)] / [2ra + 2Rk (mu + 2)]
Zout = (44K+2x2.57K)x[44K+2.57Kx(70x2)]/[2x44K+2x2.57Kx(70+2)]
Zout = 24.57KΩ
* * Zout = (44K+2x1.8K)x[44K+1.8Kx(70x2)]/[2x44K+2x1.8Kx(70+2)]
* * Zout = 23.8KΩ
放大量:
∵ 2Iq  ←  每管
    2(2Iq)RL = Eo（输出）
    2x(2x1.12mA)x68K = 304.6V（输出）  
* *     2x(2x1.47mA)x68K = 399.84V（输出）
       2IqRk = Ei（输入）
       2x1.12mAx2.57K = 5.76V（输入）
* *        2x1.47mAx1.8K = 5.3V（输入）
∴ A = Eo / Ei
∴ A = 304.6V/5.76V = 53倍
* * ∴ A = 399.84V/5.3V = 75.44倍

yuopi

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