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61. 发明专利

JPS55136965A FERRORESONANCE TYPE FREQUENCY CONVERTER 失效
公开(公告)号：JPS55136965A
公开(公告)日：1980-10-25
申请号：JP4511679
申请日：1979-04-13
申请人： MIWA ELECTRIC
发明人： TANAKA EITAROU , HIRAYAMA MASAYOSHI
IPC分类号： G01R23/08 , G01R23/02
摘要： PURPOSE:To increase frequency conversion precision by a method wherein a fundamental wave filter is connected to the output side of a ferroresonance type transformer in which the input voltage whose frequency is to be measured is impressed on its input side, and the relationship between frequency and voltage is made so that it can be expressed by a linear equation. CONSTITUTION:AC voltage, whose frequency is to be measured, is applied to the input terminal a of ferroresonance type transformer circuit 1, and this AC voltage is impressed on ferroresonance type transformer T1. Fundamental wave filter 2 is connected to the output winding of this transformer T1, and thereby the spike which is to become noise produced in the output of transformer T1 is removed, and only the fundamental wave is taken out. The fundamental wave taken out in this way is rectified by full wave rectifying circuit 3, and thereby a voltage proportional to the frequency of the input is produced. The relationship between this voltage V and frequency f is expressed by the linear equation f=kv/2piBmax, where k is a constant determined by the circuit connection, and Bmax is the maximum saturation magnetic flux density of transformer T1.

62. 发明专利

JPS5596465A FREQUENCY DETECTING CIRCUIT 失效
公开(公告)号：JPS5596465A
公开(公告)日：1980-07-22
申请号：JP433679
申请日：1979-01-18
申请人： MITSUBISHI ELECTRIC CORP
发明人： TAWARA TAKESHI , OGINO HIROSHI , TADA HIDEAKI
IPC分类号： G01R23/08 , H02H3/46
摘要： PURPOSE:To detect the rate of variation in the frequency of power as an analogue quantity, by providing a varying-frequency power source with a circuit comprising a capacitor, a rectifier and a resistor. CONSTITUTION:A full-wave rectifier 2 is connected to a varying-frequency power source 1 through a capacitor 3. A resistor 4 is connected between terminals for picking off the DC output of the full-wave rectifier 2. The frequency f of the power source 1, the capacitance C of the capacitor 3 and the resistance R of the resistor 4 are related to one another as R.2pif.C

63. 实用新型

JPS53150262U 失效
公开(公告)号：JPS53150262U
公开(公告)日：1978-11-27
申请号：JP5637877
申请日：1977-05-02
IPC分类号： G01R23/08 , G01R23/06 , H03K9/06

64. 发明专利

JPS5128181B1 失效
公开(公告)号：JPS5128181B1
公开(公告)日：1976-08-17
申请号：JP7926270
申请日：1970-09-11
IPC分类号： G01R23/08 , G01R23/02 , H03L7/02 , H03B3/04

65. 实用新型

JPS5035135U 失效
公开(公告)号：JPS5035135U
公开(公告)日：1975-04-14
申请号：JP8694573
申请日：1973-07-24
IPC分类号： G01R23/08 , G01R23/02 , H03H5/00

66. 发明专利

JPS4837628B1 失效
公开(公告)号：JPS4837628B1
公开(公告)日：1973-11-12
申请号：JP2810968
申请日：1968-04-27
IPC分类号： G01R23/08 , G01R29/02

67. 实用新型

JPS4836208Y1 失效
公开(公告)号：JPS4836208Y1
公开(公告)日：1973-10-30
申请号：JP11085269
申请日：1969-11-21
IPC分类号： H03D3/00 , G01R23/08 , G01R23/175 , G01R33/26 , H03D3/06 , H04L27/14 , G01R33/08

68. 实用新型

JPS475112Y1 失效
公开(公告)号：JPS475112Y1
公开(公告)日：1972-02-22
申请号：JP2772067
申请日：1967-04-03
IPC分类号： G01R23/08

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