EP0067686A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Power supply device for atomizer used in atomic absorptiometer
Assignee: Hitachi Ltd
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Filing: 1982-06-11
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Granted: —
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Expires: 2002-06-11
Abstract
Abstract A power supply device for an atomizer (9) of resistance heating type used in an atomic absorptiometer, which comprises a constant current control circuit including a current negative feedback circuit (5, 16; 5, 36) for maintaining the current supplied to the atomizer (9) at a constant value corresponding to a given current setting signal, a circuit (10, 13, 14) calculating the power supplied to the atomizer (9), and a current compensation circuit (16, 36) for regulating manually or automatically the rate of negative feedback through the negative feedback circuit or the level of the current setting signal in response to a variation of the output signal from the power calculating circuit.
Inventors
- 👤 Tsutomu Ogawa
- 👤 Higeaki Koizumi
- 👤 Katsuhito Harada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:50
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G01; G01N; G01N21/00; G01N21/62; G01N21/71; G01N21/74; G05F; G05F1/00; G05F1/66
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
172 words
A power supply device for an atomizer (9) of resistance heating type used in an atomic absorptiometer, comprising means (11, 13) for detecting the current supplied to and the voltage applied across said atomizer (9), a constant current control circuit including a negative feedback circuit (5,16; 5,36) provided for the negative feedback of the output signal from said current detecting means for controlling the current supplied to said atomizer (9) thereby maintaining said current at a constant value corresponding to a given current setting signal (1 0 ) applied to an input terminal (1), characterised in that the device has means (14; 25) for calculating the power supplied to said atomizer (9) on the basis of the output signals from said current detecting means and said voltage detecting means (11, 13), and current compensating means (16; 36) for manually or automatically regulating the level of said current setting signal or the rate of negative feedback through said negative feedback circuit depending on the output signal from said power calculating means (14; 25).
Claim 2
Dependent Claim
172 words
A power supply device for an atomizer (9) of resistance heating type used in an atomic absorptiometer, comprising means (11, 13) for detecting the current supplied to and the voltage applied across said atomizer (9), a constant current control circuit including a negative feedback circuit (5,16; 5,36) provided for the negative feedback of the output signal from said current detecting means for controlling the current supplied to said atomizer (9) thereby maintaining said current at a constant value corresponding to a given current setting signal (1 0 ) applied to an input terminal (1), characterised in that the device has means (14; 25) for calculating the power supplied to said atomizer (9) on the basis of the output signals from said current detecting means and said voltage detecting means (11, 13), and current compensating means (16; 36) for manually or automatically regulating the level of said current setting signal or the rate of negative feedback through said negative feedback circuit depending on the output signal from said power calculating means (14; 25).
Claim 3
Dependent Claim
30 words
A power supply device as claimed in Claim 1, wherein said current compensating means includes a variable resistor (16) which is manually adjusted and connected to said negative feedback circuit.
Claim 4
Dependent Claim
80 words
A power supply device as claimed in Claim 1, wherein said current compensating means includes first means (18, 19) for generating an output signal indicative of a variation of the output signal from said power calculating means (14), a variable-gain amplifier (36) connected to said negative feedback circuit for changing the rate of negative feedback, and second means (40, 21) for automatically regulating the gain of said variable-gain amplifier (36) in response to the output signal from said first means.
Claim 5
Dependent Claim
93 words
A power supply device as claimed in Claim 1, wherein said current compensating means includes a computer (25) so programmed as to calculate the numerical value corresponding to the required variation of the gain of said variable-gain amplifier (36) connected to said negative feedback circuit for changing the rate of negative feedback in response to the variation of the output signal from said power calculating means (14), and means (40, 21) for automatically regulating the gain of said variable-gain amplifier (36) on the basis of said numerical value calculated by said computer (25).
Claim 6
Dependent Claim
63 words
A power supply device as claimed in Claim 1, wherein said current compensating means includes first means (18, 19) for generating an output signal indicative of a variation of the output signal from said power calculating means (14), and second means (40, 21) for automatically regulating the level of said current setting signal in response to the output signal from said first means.
Claim 7
Dependent Claim
46 words
A power supply device as claimed in Claim 1, wherein said current compensating means includes a microcomputer (25) so programmed as to automatically regulating the level of said current setting signal in response to the variation of the output signal from said power calculating means (14).
References Cited (Backward Citations)
No citation records indexed.
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