EP0139210A2
Expired / Lapsed
EP
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Converting circuit
Assignee: Toshiba Corp
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Filing: 1984-09-12
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Granted: —
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Expires: 2004-09-12
Abstract
Abstract There is provided a converting circuit which functions as a transformer for an electronic circuit by electrically isolating the input and output terminals (14, 16) by optically coupling the input circuit system and the output circuit system through photocouplers (PC1, PC2).
Inventors
- 👤 Katsumi C/O Patent Division Nagano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 08:54
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/78; H03K17/795; H03K17/7955; H04; H04B; H04B10/00; H04B10/80; H04B10/801; H04B10/802
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
260 words
A converting circuit for obtaining from a output terminal a voltage and a current which are proportional to a voltage and a current applied to an input terminal, characterized by comprising: a first terminal (14); first voltage/current converting means (Q9, 18) for converting a voltage (VI) applied to said first terminal (14) to a first current (I c l) corresponding to said voltage (Vl); first electric/photoconverting means (LED1) for converting the first current (I c l) output from said first voltage/current converting means (Q9, 18) to an optical signal; first photoelectric converting means (Q10) which is optically coupled to said first electric/photoconverting means (LED1) and obtains a current corresponding to the optical signal generated by said first electric/photoconverting means; current/voltage converting means (R4) for converting an output current of said first photoelectric converting means (QlO) to a voltage corresponding thereto; a second terminal (16); load (RL) provided for said second terminal (16); second voltage/current converting means (Qll, 19) for applying the voltage generated by said current/voltage converting means (R4) to said second terminal (16) and for generating a second current (I c 2) which is set by the load means provided for said second terminal (16); second electric/photoconverting means (LED2) for converting said second current (I C 2) generated by said second voltage/current converting means (Qll, 19) to an optical signal corresponding thereto; and second photoelectric converting means (Q12) which is optically coupled to said second electric/photoconverting means (LED2) and supplies a current corresponding to the optical signal generated by said second electric/photoconverting means (LED2) to said first terminal (14).
Claim 2
Dependent Claim
260 words
A converting circuit for obtaining from a output terminal a voltage and a current which are proportional to a voltage and a current applied to an input terminal, characterized by comprising: a first terminal (14); first voltage/current converting means (Q9, 18) for converting a voltage (VI) applied to said first terminal (14) to a first current (I c l) corresponding to said voltage (Vl); first electric/photoconverting means (LED1) for converting the first current (I c l) output from said first voltage/current converting means (Q9, 18) to an optical signal; first photoelectric converting means (Q10) which is optically coupled to said first electric/photoconverting means (LED1) and obtains a current corresponding to the optical signal generated by said first electric/photoconverting means; current/voltage converting means (R4) for converting an output current of said first photoelectric converting means (QlO) to a voltage corresponding thereto; a second terminal (16); load (RL) provided for said second terminal (16); second voltage/current converting means (Qll, 19) for applying the voltage generated by said current/voltage converting means (R4) to said second terminal (16) and for generating a second current (I c 2) which is set by the load means provided for said second terminal (16); second electric/photoconverting means (LED2) for converting said second current (I C 2) generated by said second voltage/current converting means (Qll, 19) to an optical signal corresponding thereto; and second photoelectric converting means (Q12) which is optically coupled to said second electric/photoconverting means (LED2) and supplies a current corresponding to the optical signal generated by said second electric/photoconverting means (LED2) to said first terminal (14).
Claim 3
Dependent Claim
40 words
A converting circuit according to claim 1, characterized in that said first voltage/current converting means (Q9, R3, 18) consists of a transistor (Q9) and a resistor (R3), one end of which is connected to the emitter of said transistor (Q9).
Claim 4
Dependent Claim
63 words
A converting circuit according to claim 1, characterized in that said first voltage/current converting means (Q9, R3, 18) consists of a transistor (Q9), a resistor (R3), one end of which is connected to the emitter of said transistor (Q9), and an operational amplifier (Al) for controlling the conduction of said transistor (Q9) on the basis of the emitter potential of the transistor (Q9).
Claim 5
Dependent Claim
22 words
A converting circuit according to claim 1, characterized in that said second voltage/current converting means (Qll, 19) consists of a transistor (Qll).
Claim 6
Dependent Claim
46 words
A converting circuit according to claim 1, characterized in that said second voltage/current converting means (Qll, 19) consists of a transistor (Qll) and an operational amplifier (A2) for controlling the conduction of said transistor (Qll) on the basis of the emitter potential of the transistor (Qll).
Claim 7
Dependent Claim
26 words
' A converting circuit according to claim 1, characterized in that said first and second electric/photoconverting means (LED1, LED2) respectively consists of light-emitting diodes (LED1, LED2).
Claim 8
Dependent Claim
25 words
A converting circuit according to claim 1, characterized in that said first and second photoelectric converting means (Q10, Q12) respectively consists of phototransistors (Q10, Q12).
Claim 9
Dependent Claim
20 words
A converting circuit according to claim 1, characterized in that said voltage/current converting means (R4) consists of a resistor (R4).
Claim 10
Dependent Claim
19 words
A converting circuit according to claim 1, characterized in that said load means (RL) consists of a resistor (RL).
Claim 11
Dependent Claim
57 words
A converting circuit according to claim 1, characterized in that first and second characteristic compensating circuits (20, 21) for compensating the nonlinear characteristics of said first and second electric/photoconverting means (LED1, LED2) are respectively provided among said first and second voltage/current converting means (Q9, R3, 18, Qll, 19) and said first and second electric/photoconverting means (LED1, LED2).
Claim 12
Dependent Claim
121 words
A converting circuit according to claim 10, characterized in that said first and second characteristic compensating circuits (20, 21) respectively comprise: third and fourth electric/photoconverting means (LED3, LED4) respectively having the same characteristics as those of said first and second electric/photoconverting means (LEDl, LED2); third and fourth photoelectric converting means (Q13, Q15) which are optically coupled to said third and fourth electric/photoconverting means (LED3, LED4) and have the same characteristics as those of said first and second photoelectric converting means (Q10, Q12); and first and second control means (Q14, R5, Q16, R6) for controlling said first, third, and second, fourth electric/photoconverting means (LED1, LED3, LED2, LED4) on the basis of outputs of said third and fourth photoelectric converting means (Q13, Q15).
Claim 13
Dependent Claim
25 words
A converting circuit according to claim 11, characterized in that said third and fourth electric/photoconverting means (LED3, LED4) respectively consist of light-emitting diodes (LED3, LED4).
Claim 14
Dependent Claim
25 words
A converting circuit according to claim 11, characterized in that said third and fourth photoelectric converting means (Q13, Q15) respectively consist of phototransistors (Q13, Q15).
Claim 15
Dependent Claim
60 words
A converting circuit according to claim 11, characterized in that said first and second control means (Q14, R5, Q16, R6) respectively comprise: transistors (Q14, Q16) the conductions of which are controlled by said first and second photoelectric converting means (Q10, Q12); and resistors (R5, R6) one end of which is respectively connected to the emitters of said transistors (Q14, Q16).
Claim 16
Dependent Claim
39 words
A converting circuit according to claim 1, characterized in that said converting circuit is constituted as the complementary type and has a function as a transformer of which each one end of the primary and secondary coils is grounded.
Claim 17
Dependent Claim
27 words
A converting circuit according to claim 1, characterized in that said converting circuit is constituted as a differential input type and has a function as a transformer.
References Cited (Backward Citations)
No citation records indexed.
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