CN109341722B - Multi-path constant current source for high-precision IF conversion module calibration - Google Patents
Multi-path constant current source for high-precision IF conversion module calibration Download PDFInfo
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- CN109341722B CN109341722B CN201811388594.2A CN201811388594A CN109341722B CN 109341722 B CN109341722 B CN 109341722B CN 201811388594 A CN201811388594 A CN 201811388594A CN 109341722 B CN109341722 B CN 109341722B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
- G01C25/005—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass initial alignment, calibration or starting-up of inertial devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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Abstract
The invention relates to a multi-path constant current source for calibrating a high-precision IF conversion module, which comprises a controller and four groups of independent outputs, wherein the first group and the second group output 1,2,4,10 and 15mA five-level currents; the third group and the fourth group output five-gear currents of-1, -2, -4, -10, -15 mA; the five-gear currents of each group are automatically switched, the five-gear currents output by different groups cannot be switched, and the gating of the four groups of constant current sources is controlled by the controller; each group of constant current sources consists of a positive constant current source, a negative constant current source and a single group of switching circuits. The invention can replace imported reference source, realize the calibration of the high-precision IF conversion module, realize the autonomous control and greatly improve the calibration efficiency of the IF conversion module.
Description
Technical Field
The invention belongs to the technical field of inertial navigation, relates to a high-precision IF module calibration and test technology, and particularly relates to a multi-path constant current source for high-precision IF conversion module calibration.
Background
The IF conversion module is a high-precision current detection module, is usually combined with a quartz accelerometer, and is a key module in inertial navigation equipment. Usually, the IF conversion module needs to be calibrated to realize high-precision measurement, the calibration of the high-precision IF conversion module mainly depends on a calibration device of a high-precision reference source, and the calibration device industry mostly adopts a reference source FLUKE5730 produced by the company FLUKE in the united states, which is expensive and forbidden to sell by military units in China.
Currently, high-precision reference sources (such as FLUKE5730) used in China only depend on imports for a long time, are expensive (80 thousands) and are limited by foreign sales. IF the reference source replacing the import can be invented, the calibration of the high-precision IF conversion module is realized, the autonomous controllability is realized, and the calibration efficiency of the IF conversion module is greatly improved.
No disclosure of a patent publication related to the present invention is found by a search of the patent publication.
Disclosure of Invention
The invention aims to provide a multi-channel constant current source for calibrating a high-precision IF conversion module in order to invent a reference source for replacing an inlet and realize the calibration of the high-precision IF conversion module.
The purpose of the invention is realized by the following technical scheme:
a multi-channel constant current source for calibrating a high-precision IF conversion module comprises a controller and four groups of independent outputs, wherein the first group and the second group output 1,2,4,10 and 15mA five-level currents; the third group and the fourth group output five-gear currents of-1, -2, -4, -10, -15 mA; the five-gear currents of each group are automatically switched, the five-gear currents output by different groups cannot be switched, and the gating of the four groups of constant current sources is controlled by the controller; each group of constant current sources consists of a positive constant current source, a negative constant current source and a single group of switching circuits.
The forward constant current source circuit comprises a band gap voltage reference V1, an N-channel JFET tube V2, a PNP triode V3, an operational amplifier N1, a precision resistor R1, a BJT tube consisting of V2 and V3, a high-gain negative feedback loop consisting of N1, V2 and V3, and the forward constant current source circuit ensures that the voltage at two ends of the resistor R1 is the reference voltage Vref and has the magnitude of + Vref/R1.
The negative constant current source circuit comprises a band gap voltage reference V1, an F-channel JFET tube V2, an NPN triode V3, an operational amplifier N1, a precision resistor R1, a BJT tube consisting of V2 and V3, a high-gain negative feedback loop consisting of N1, V2 and V3, and the positive constant current source circuit ensures that the voltage at two ends of the resistor R1 is the reference voltage Vref and the positive constant current source circuit is equal to-Vref/R1 in size.
Moreover, the single-group switching circuit is composed of five independent single-pole double-throw electromagnetic relays, and the relay control is controlled by a gating device of 5-to-1, so that only one current and output connection are ensured at the same time.
The invention has the advantages and positive effects that:
1. the invention belongs to a self-designed multi-channel constant current source, which can simultaneously output four paths of constant current sources, and each path of constant current source has 5 gears which can be automatically switched. The method can be used for calibrating and testing the temperature coefficient and the nonlinear coefficient of the IF module.
2. The invention can replace imported reference source, realize the calibration of the high-precision IF conversion module, realize the autonomous control and greatly improve the calibration efficiency of the IF conversion module.
Drawings
FIG. 1 is a general block diagram of the present invention;
FIG. 2 is a circuit diagram of a forward constant current source of the present invention;
FIG. 3 is a negative constant current source circuit diagram of the present invention;
fig. 4 is a schematic diagram of the switching of the multi-path constant current source of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings; the present examples are illustrative and not restrictive, and the scope of the invention is not limited thereto.
A multi-path constant current source for calibrating a high-precision IF conversion module is generally designed into four groups of independent outputs as shown in figure 1: the first group and the second group output 1,2,4,10,15mA five-gear current; the third group and the fourth group output five-gear current of-1, -2, -4, -10, -15 mA. The five-gear current of each group can be automatically switched, but the five-gear current output by different groups cannot be switched, and the gating of the four groups of constant current sources is controlled by the controller.
The specific components of the multi-path constant current source comprise a positive constant current source, a negative constant current source and a single group of switching circuits, wherein the circuit diagram of the positive constant current source is shown in figure 2, the circuit diagram of the negative constant current source is shown in figure 3, and the schematic diagram of the single group of switching circuits for switching the multi-path constant current source is shown in figure 4.
1. A forward constant current source circuit:
v1 is a band gap voltage reference, the voltage difference at two ends of the reference is Vref, the voltage reference has high stability and low temperature coefficient, and the design selects LM199 voltage reference of TI company;
the BJT transistors are formed by V2 and V3 and play a role in power amplification, particularly a JFET (junction field effect transistor) transistor is required to be selected for the V2 of the input stage, and the BJT transistor is characterized in that the gate leakage current is small and can basically reach the pA level; for a forward constant current source, the V2 selects an N-channel JFET tube, and the V3 selects a PNP triode;
the operational amplifier is a low offset voltage precision operational amplifier, such as OPA 177;
r1 is a precision resistor, a high-precision gold foil resistor is selected, and the temperature coefficient can reach 0.2 ppm/DEG C.
N1, V2 and V3 form a high-gain negative feedback loop, and the voltage at two ends of a resistor R1 is ensured to be a reference voltage Vref, so that the following steps are obtained:
the positive constant current source has a magnitude of + Vref/R1.
2. Negative constant current source circuit:
the negative constant current source and the positive constant current source are similar in structure, the power supply voltage is-15V, a P-channel JFET tube is used as V2, and an NPN triode is used as V3.
Similarly, N1, V2, V3 form a high gain negative feedback loop, and the voltage across the resistor R1 is ensured to be the reference voltage Vref, so that:
the negative constant current source is-Vref/R1.
3. And (3) multipath automatic switching design:
the significance of realizing automatic switching is that automatic calibration can be realized. According to the requirements of the IF module, +/-1 mA current needs to be output to calibrate the temperature coefficient and symmetry of the scale, +/-1 mA- +/-15 mA current needs to be output at the same time, and the middle is divided into five grades. And carrying out nonlinear calibration and testing.
Fig. 4 is a schematic diagram showing a single group of switching of the multi-path constant current source, and the connection relationship is as follows: the single-group switching circuit is composed of five independent single-pole double-throw electromagnetic relays, and the relay control is controlled by a gating device of 1-out-of-5, so that only one path of current and output connection are ensured at the same time.
The invention is used as a constant current source for calibration, and most attention is paid to 24-hour stability and temperature coefficient of current output.
Through measurement and calculation, the invention is applied under the condition that the ambient temperature is 24 +/-1 ℃:
24 hour stability (mean square error): better than 2 ppm;
temperature coefficient (-10 ℃ C. to 50 ℃ C.): better than 1 ppm/DEG C.
Claims (2)
1. A high accuracy IF conversion module marks used multichannel constant current source which characterized in that: the device comprises a controller and four groups of independent outputs, wherein the first group and the second group output 1,2,4,10 and 15mA five-gear currents; the third group and the fourth group output five-gear currents of-1, -2, -4, -10, -15 mA; the five-gear currents of each group are automatically switched, the five-gear currents output by different groups cannot be switched, and the gating of the four groups of constant current sources is controlled by the controller; each group of constant current sources consists of a positive constant current source, a negative constant current source and a single group of switching circuits;
the forward constant current source circuit comprises a band-gap voltage reference V1, an N-channel JFET (junction field effect transistor) V2, a PNP triode V3, an operational amplifier N1, a precision resistor R1, a BJT (bipolar junction transistor) consisting of V2 and V3, a high-gain negative feedback loop consisting of N1, V2 and V3, and the forward constant current source circuit ensures that the voltage at two ends of the resistor R1 is the reference voltage Vref and has the magnitude of + Vref/R1;
the negative constant current source circuit comprises a band gap voltage reference V1, an F-channel JFET tube V2, an NPN triode V3, an operational amplifier N1, a precision resistor R1, a BJT tube consisting of V2 and V3, a high-gain negative feedback loop consisting of N1, V2 and V3, and the positive constant current source circuit ensures that the voltage at two ends of the resistor R1 is the reference voltage Vref and the positive constant current source circuit is equal to-Vref/R1 in size.
2. The multi-path constant current source for calibration of the high precision IF conversion module of claim 1, wherein: the single-group switching circuit is composed of five independent single-pole double-throw electromagnetic relays, and the relay control is controlled by a gating device of 1-out-of-5, so that only one path of current and output connection are ensured at the same time.
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| CN109856589A (en) * | 2019-03-05 | 2019-06-07 | 国网浙江省电力有限公司电力科学研究院 | Direct current calibrating installation based on calibration power source method |
| CN109975737A (en) * | 2019-03-05 | 2019-07-05 | 国网浙江省电力有限公司电力科学研究院 | Direct current calibrating installation based on the high steady power source of measuring resistance method adjustment |
| CN111638744B (en) * | 2020-04-30 | 2022-05-24 | 北京航天时代光电科技有限公司 | Current frequency conversion circuit |
| CN112285541B (en) * | 2020-09-21 | 2023-05-30 | 南京理工大学 | Fault diagnosis method for current frequency conversion circuit |
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| US7020449B2 (en) * | 2002-10-21 | 2006-03-28 | Broadcom Corporation | Fast settling variable gain amplifier with DC offset cancellation |
| US8248151B2 (en) * | 2010-08-24 | 2012-08-21 | Analog Devices, Inc. | Apparatus and method configured to provide electrical bias |
| JP2012059081A (en) * | 2010-09-09 | 2012-03-22 | Mitsutoshi Sugawara | Reference voltage generation circuit |
| CN103441764B (en) * | 2013-08-20 | 2016-09-21 | 北京控制工程研究所 | A kind of power frequency change-over circuit |
| CN103558495B (en) * | 2013-11-11 | 2016-03-23 | 成都曙创科技有限公司 | A kind of multi-channel circuit on-off detection device |
| CN104750158A (en) * | 2013-12-25 | 2015-07-01 | 西安航天远征流体控制股份有限公司 | High accuracy constant current source with open circuit protection function |
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