CN115436689A - Electricity zero position testing arrangement based on two fortune are put and hall current sensor - Google Patents

Electricity zero position testing arrangement based on two fortune are put and hall current sensor Download PDF

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Publication number
CN115436689A
CN115436689A CN202211166535.7A CN202211166535A CN115436689A CN 115436689 A CN115436689 A CN 115436689A CN 202211166535 A CN202211166535 A CN 202211166535A CN 115436689 A CN115436689 A CN 115436689A
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China
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capacitor
diode
twenty
resistor
terminal
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CN202211166535.7A
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CN115436689B (en
Inventor
卜小龙
李兵
雷佳
崔红卫
李少卓
刘天宇
李利博
李楠
张冬玲
谷雨
杨策
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Shaanxi Electronic Technology Research Institute Co ltd
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Shaanxi Electronic Technology Research Institute Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac

Abstract

The invention discloses an electric zero position testing device based on double operational amplifiers and a Hall current sensor, which comprises a 220V/50Hz input voltage end, an R-type transformer circuit, a rectifying circuit, a filter circuit, a series linear voltage stabilizing circuit, an overcurrent protection circuit, a current detection circuit, a primary voltage stabilizing circuit, a secondary voltage stabilizing circuit, a temperature control circuit, an electric zero position automatic regulating circuit and a manual double-gear switching circuit. According to the invention, the function of poor symmetry caused by temperature drift is solved by adopting the SE158 dual operational amplifier with low offset voltage and the low-temperature-drift high-precision metal platinum sampling resistor with the concentration of 25ppm, the automatic temperature regulation is realized by adopting temperature closed-loop control, the temperature drift problem is further optimized, the output current is detected by adopting a domestic high-linearity SE724 Hall current sensor, and the current detection precision can reach 0.2%.

Description

Electricity zero position testing arrangement based on two fortune are put and hall current sensor
Technical Field
The invention relates to the technical field of zero-bit testing, in particular to a zero-bit testing device based on double operational amplifiers and a Hall current sensor.
Background
At present, in the study of the null point, temperature drift is a main factor influencing the null point, the change of the temperature causes the change of the symmetry, and the error caused by the temperature drift is not processed by corresponding closed-loop control in the current technical scheme, and the voltage with good symmetry is difficult to obtain in the later stage.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide an electric zero position testing apparatus based on dual operational amplifiers and hall current sensors.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides an electric zero position testing device based on a double operational amplifier and a Hall current sensor, which comprises a 220V/50Hz input voltage end, an R-type transformer circuit, a rectifying circuit, a filter circuit, a series linear voltage stabilizing circuit, an overcurrent protection circuit, a current detection circuit, a primary voltage stabilizing circuit, a secondary voltage stabilizing circuit, a temperature control circuit, an electric zero position automatic regulating circuit and a manual double-gear switching circuit, wherein 220V/50Hz alternating current output by the 220V/50Hz input voltage end is subjected to the R-type transformer circuit and then outputs a +/-28V alternating current power supply, the +/-28V alternating current power supply output by the R-type transformer circuit is subjected to the rectifying circuit and the filter circuit to obtain +/-28V direct current voltage, and then the 28V stable voltage is obtained by the series linear voltage stabilizing circuit, the automatic zero-position adjusting circuit and the manual double-gear switching circuit are connected to the output end of the first-level voltage stabilizing circuit and used for adjusting the symmetry of output positive voltage and negative voltage and keeping the mirror image characteristics, and when the positive voltage or the negative voltage is subjected to temperature drift, the automatic zero-position adjusting circuit automatically adjusts through low offset voltage operational amplifier.
Preferably, the R-type transformer circuit includes an R-type transformer, a power supply main switch and a fuse, the live line of the 220V/50Hz input voltage end is connected in series with the power supply main switch and then connected with the first input end of the R-type transformer, and the zero line of the 220V/50Hz input voltage end is connected in series with the fuse and then connected with the second input end of the R-type transformer.
Preferably, the rectifier circuit comprises a rectifier, a first input end of the rectifier is connected with a positive output end of the R-type transformer, and a second input end of the rectifier is connected with a negative output end of the R-type transformer;
the filter circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor, wherein the first end of the first capacitor is connected with the positive electrode output end of the rectifier, the first end of the third capacitor and the first end of the fifth capacitor respectively, the first end of the second capacitor is connected with the negative electrode output end of the rectifier, the first end of the fourth capacitor and the first end of the sixth capacitor respectively, the second end of the first capacitor is connected with the second end of the second capacitor, the second end of the third capacitor is connected with the second end of the fourth capacitor, and the second end of the fifth capacitor is connected with the second end of the sixth capacitor.
Preferably, the series linear voltage stabilizing circuit comprises a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor, wherein the anode of the first diode is respectively connected with the cathode of the second diode, the grounding end of the R-type transformer, the first end of the seventh capacitor, the first end of the eighth capacitor, the first end of the ninth capacitor, the first end of the tenth capacitor, the first end of the eleventh capacitor and the first end of the twelfth capacitor, the cathode of the first diode is respectively connected with the first end of the first resistor and the first end of the third resistor, the second end of the first resistor is connected with the first end of the fifth capacitor, the anode of the second diode is respectively connected with the first end of the second resistor and the first end of the fourth resistor, and the second end of the second resistor is connected with the first end of the sixth capacitor.
Preferably, the overcurrent protection circuit includes a first triode, a second triode, a third triode, a fourth triode, a fifth triode, a sixth triode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor, a base of the first triode is respectively connected with a collector of the third triode, a second end of the seventh capacitor, a second end of the third resistor and a base of the fifth triode, a collector of the fifth triode is respectively connected with a collector of the first triode and a second end of the first resistor, an emitter of the fifth triode is connected with the fifth resistor in series and then respectively connected with a first end of the seventh resistor, a first end of the eighth resistor, a first end of the ninth resistor and a base of the third triode, an emitting electrode of the first triode is sequentially connected with a sixth resistor and a tenth resistor in series and then respectively connected with a second end of the seventh resistor, a second end of the eighth resistor, a second end of the ninth resistor, an emitting electrode of the third triode, a second end of the ninth resistor and a second end of the eleventh capacitor, a base electrode of the second triode is respectively connected with a second end of the eighth capacitor, a second end of the fourth resistor, a base electrode of the sixth triode and a collector electrode of the fourth triode, a collector electrode of the sixth triode is respectively connected with a collector electrode of the second triode and a second end of the second resistor, a collector electrode of the sixth triode is connected with a twelfth resistor in series and then respectively connected with a base electrode of the fourth triode, a first end of the fourteenth resistor, a first end of the fifteenth resistor and a first end of the sixteenth resistor, and the emitter of the second triode is sequentially connected with an eleventh resistor and a thirteenth resistor in series and then is respectively connected with the second end of the fourteenth resistor, the second end of the fifteenth resistor, the second end of the sixteenth resistor, the emitter of the fourth triode, the second end of the tenth capacitor and the second end of the twelfth capacitor.
Preferably, the current detection circuit includes a first hall current sensor, a second hall current sensor, a first detection terminal, a second detection terminal, a first light emitting diode, a second light emitting diode, a seventeenth resistor, an eighteenth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a sixteenth capacitor, the IP + end of the first Hall current sensor is connected with the emitter of the third triode, the VCC end of the first Hall current sensor is respectively connected with the first end of the thirteenth capacitor, the first end of the seventeenth resistor and the 5V end of the first detection end, a second end of the thirteenth capacitor is connected with a cathode of the first light emitting diode and grounded, an anode of the first light emitting diode is connected with a second end of the seventeenth resistor, the VIOUT end of the first Hall current sensor is connected with the VOUT1 end of the first detection end, the FILTER end of the first hall current sensor is connected with the fourteenth capacitor in series and then respectively connected with the GND end of the first detection end and the GND end of the first hall current sensor in parallel, the IP + end of the second Hall current sensor is connected with the emitter of the fourth triode, the VCC end of the second Hall current sensor is respectively connected with the first end of the fifteenth capacitor, the first end of the eighteenth resistor and the 5V end of the second detection end, a second end of the fifteenth capacitor is connected with a cathode of a second light emitting diode and grounded, an anode of the second light emitting diode is connected with a second end of an eighteenth resistor, the VIOUT end of the second Hall current sensor is connected with the VOUT2 end of the second detection end, and the FILTER end of the second Hall current sensor is connected with the sixteenth capacitor in series and then is respectively connected with the GND end of the second detection end and the GND end of the second Hall current sensor and then is grounded.
Preferably, the first-stage voltage stabilizing circuit comprises a first voltage stabilizer, a second voltage stabilizer, a third voltage stabilizer, a fourth voltage stabilizer, a fifth voltage stabilizer, a sixth voltage stabilizer, a seventh voltage stabilizer, an eighth voltage stabilizer, a ninth voltage stabilizer, a tenth voltage stabilizer, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a ninth diode, a twelfth diode, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a twenty-ninth capacitor, a thirty-third capacitor, a thirty-fourth capacitor, the negative electrode of the eleventh diode is grounded, the positive electrode of the eleventh diode is respectively connected with the ADJ end of the first voltage stabilizer, the first end of the nineteenth capacitor, the ADJ end of the second voltage stabilizer, the first end of the twentieth capacitor, the ADJ end of the third voltage stabilizer, the first end of the twenty-first capacitor, the ADJ end of the fourth voltage stabilizer, the first end of the twenty-second capacitor, the ADJ end of the fifth voltage stabilizer and the first end of the twenty-third capacitor, the IN end of the first voltage stabilizer is respectively connected with the IN end of the second voltage stabilizer, the IN end of the third voltage stabilizer, the IN end of the fourth voltage stabilizer and the first end of the twenty-fourth capacitor, the second end of the nineteenth capacitor is respectively connected with the OUT end of the first voltage stabilizer and the positive electrode of the first diode, the second end of the twenty-capacitor is respectively connected with the OUT end of the second voltage stabilizer and the positive electrode of the second diode, the second end of the twenty-first capacitor is respectively connected with the OUT end of the third voltage stabilizer and the anode of the third diode, the second end of the twenty-second capacitor is respectively connected with the OUT end of the fourth voltage stabilizer and the anode of the fourth diode, the second end of the twenty-third capacitor is respectively connected with the OUT end of the fifth voltage stabilizer and the anode of the fifth diode, the cathode of the first diode is respectively connected with the cathode of the second diode, the cathode of the third diode, the cathode of the fourth diode, the cathode of the fifth diode, the first end of the twenty-sixth capacitor, the first end of the twenty-eighth capacitor and the 24V anode output end, the second end of the twenty-sixth capacitor is respectively connected with the second end of the twenty-fourth capacitor, the first end of the twenty-fifth capacitor, the first end of the twenty-seventh capacitor, the second end of the twenty-eighth capacitor and the first end of the twenty-ninth capacitor, the second end of the twenty-seventh capacitor is respectively connected with the second end of the twenty-ninth capacitor, the 24V negative output end, the anode of the sixth diode, the anode of the seventh diode, the anode of the eighth diode, the anode of the ninth diode and the anode of the twelfth diode, the cathode of the sixth diode is respectively connected with the OUT end of the sixth voltage stabilizer and the first end of the thirty-second capacitor, the second end of the thirty-second capacitor is respectively connected with the ADJ end of the sixth voltage stabilizer, the first end of the thirty-first capacitor, the ADJ end of the seventh voltage stabilizer, the first end of the thirty-second capacitor, the ADJ end of the ninth voltage stabilizer, the first end of the thirty-third capacitor, the ADJ end of the tenth voltage stabilizer, the first end of the thirty-fourth capacitor and the cathode of the twelfth diode, the anode of the twelfth diode is grounded, the second end of the thirty-first capacitor is connected with the cathode of the seventh diode and the OUT end of the seventh voltage stabilizer respectively, the second end of the thirty-second capacitor is connected with the cathode of the eighth diode and the OUT end of the eighth voltage stabilizer respectively, the second end of the thirty-third capacitor is connected with the cathode of the ninth diode and the OUT end of the ninth voltage stabilizer respectively, the second end of the thirty-fourth capacitor is connected with the cathode of the twelfth diode and the OUT end of the tenth voltage stabilizer respectively, the IN end of the fifth voltage stabilizer is connected with the 28V anode output end, the IN end of the sixth voltage stabilizer is connected with the 28V cathode output end, and the second end of the twenty-fifth capacitor is connected with the IN end of the seventh voltage stabilizer, the IN end of the eighth voltage stabilizer, the IN end of the ninth voltage stabilizer and the IN end of the tenth voltage stabilizer respectively.
Preferably, the two-stage voltage stabilizing circuit includes a thirteenth diode, a fourteenth diode, a fifteenth diode, a sixteenth diode, a seventeenth diode, an eighteenth diode, a nineteenth diode, a twentieth diode, a twenty-first diode, a twenty-second diode, a twenty-third diode, a twenty-fourth diode, a twenty-fifth diode, a twenty-sixth diode, a twenty-seventh diode, a twenty-eighth diode, a twenty-ninth diode, a thirty-eleventh diode, a thirty-second diode, an eleventh voltage regulator, a twelfth voltage regulator, a thirteenth voltage regulator, a fourteenth voltage regulator, a fifteenth voltage regulator, a sixteenth voltage regulator, a seventeenth voltage regulator, an eighteenth voltage regulator, a nineteenth voltage regulator, a twentieth voltage regulator, a thirty-fifth capacitor, a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-ninth capacitor, a forty-fourth capacitor, a forty-first capacitor, a forty-second capacitor, a forty-third capacitor, a forty-fourth capacitor, a forty-fifth capacitor, a forty-sixth capacitor, a forty-seventh capacitor, a forty-eighth capacitor, a ninth capacitor and a fourteenth capacitor, the cathode of the thirteenth diode is connected with the 785-ADJ end, the anode of the thirteenth diode is respectively connected with the first end of the thirty-fifth capacitor, the ADJ end of the eleventh voltage stabilizer, the first end of the thirty-sixth capacitor, the ADJ end of the twelfth voltage stabilizer, the first end of the thirty-seventh capacitor, the ADJ end of the thirteenth voltage stabilizer, the first end of the thirty-eighth capacitor, the ADJ end of the fourteenth voltage stabilizer, the first end of the thirty-ninth capacitor and the ADJ end of the fifteenth voltage stabilizer, a second terminal of the thirty-fifth capacitor is connected to an anode of the fifteenth diode, the second end of the thirty-sixth capacitor is respectively connected with the anode of a sixteenth diode and the OUT end of a twelfth voltage stabilizer, the second end of the thirty-seventh capacitor is respectively connected with the anode of a seventeenth diode and the OUT end of a thirteenth voltage stabilizer, the second end of the thirty-eighth capacitor is respectively connected with the anode of an eighteenth diode and the OUT end of a fourteenth voltage stabilizer, the second end of the thirty-ninth capacitor is respectively connected with the anode of a nineteenth diode and the OUT end of a fifteenth voltage stabilizer, the cathode of the fifteenth diode is respectively connected with the cathode of a sixteenth diode, the cathode of a seventeenth diode, the cathode of an eighteenth diode, the cathode of a nineteenth diode, the first end of a forty-second capacitor, the first end of a forty-fourth capacitor, the anode of a twenty-fifth diode, the anode of a twenty-sixth capacitor, the anode of a twenty-seventh capacitor and the anode of a twenty-eighth diode, the cathode of the twenty-fifth diode is respectively connected with the cathodes of the twenty-sixth diode, the twenty-seventh diode, the cathode of the twenty-eighth diode and the third end of a +/-15V direct current power supply terminal, the IN end of the eleventh voltage stabilizer is respectively connected with the IN end of the twelfth voltage stabilizer, the IN end of the thirteenth voltage stabilizer, the IN end of the fourteenth voltage stabilizer, the IN end of the fifteenth voltage stabilizer, the first end of the forty-capacitor and the 24V positive output terminal, the second end of the forty-capacitor is respectively connected with the first end of the forty-first capacitor, the second end of the forty-second capacitor, the first end of the forty-third capacitor, the second end of the forty-fourth capacitor, the first end of the forty-fifth capacitor and the second end of the +/-15V direct current power supply terminal and then connected with the ground, a second end of the forty-third capacitor is connected with a second end of the forty-fifth capacitor, a cathode of the twenty-ninth diode, a cathode of the thirty-fourth diode, a cathode of the thirty-eleventh diode, a cathode of the thirty-second diode, an anode of the twentieth diode, an anode of the twenty-first diode, an anode of the twenty-third diode and an anode of the twenty-fourth diode respectively, an anode of the twenty-ninth diode is connected with a first end of a +/-15V direct-current power supply terminal, an anode of the thirty-second diode, an anode of the thirty-first diode and an anode of the thirty-second diode respectively, an IN end of the sixteenth regulator is connected with a 24V cathode output end, a second end of the forty-first capacitor is connected with an IN end of the seventeenth regulator, an IN end of the eighteenth regulator, an IN end of the nineteenth regulator and an IN end of the twentieth regulator respectively, the first end of the forty-sixth capacitor is respectively connected with the cathode of the twentieth diode and the OUT end of the sixteenth voltage stabilizer, the second end of the forty-sixth capacitor is respectively connected with the ADJ end of the sixteenth voltage stabilizer, the first end of the forty-seventh capacitor, the ADJ end of the seventeenth voltage stabilizer, the first end of the forty-eighth capacitor, the ADJ end of the eighteenth voltage stabilizer, the first end of the forty-ninth capacitor, the ADJ end of the nineteenth voltage stabilizer, the first end of the fifty-fifth capacitor and the ADJ end of the twentieth voltage stabilizer, the second end of the forty-sixth capacitor is respectively connected with the cathode of the twentieth diode and the OUT end of the sixteenth voltage stabilizer, the second end of the forty-seventh capacitor is respectively connected with the cathode of the twenty-first diode and the OUT end of the seventeenth voltage stabilizer, the second end of the forty-eighth capacitor is respectively connected with the cathode of the twenty-second diode and the OUT end of the eighteenth voltage stabilizer, and the second end of the fifty-ninth capacitor is connected with the cathode of the twenty-third diode and the OUT end of the nineteenth voltage stabilizer respectively, and the second end of the fifty-ninth capacitor is connected with the cathode of the twenty-fourth diode and the OUT end of the twentieth voltage stabilizer respectively.
Preferably, the temperature control circuit includes a fan, a seventh triode, a temperature sensor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, and a twenty-seventh resistor, a first end of the twenty-first resistor is connected to the 12V power output terminal and a first end of the twenty-second resistor, a second end of the twenty-first resistor is connected to a second end of the twenty-second resistor, a first end of the fan, and a first end of the temperature sensor, a second end of the temperature sensor is connected to a first end of the twenty-third resistor and a first end of the twenty-fourth resistor, a second end of the twenty-third resistor is connected to a base of the seventh triode, a collector of the seventh triode is connected to a second end of the fan, a first end of the twenty-fifth resistor, a first end of the twenty-sixth resistor, and a first end of the twenty-seventh resistor, and an emitter of the seventh triode is connected to a second end of the twenty-fourth resistor, a second end of the twenty-fifth resistor, a second end of the twenty-sixth resistor, and a second end of the twenty-seventh resistor.
Preferably, the null automatic adjusting circuit includes an operational amplifier, a first sliding rheostat, a second sliding rheostat, a seventeenth capacitor, a nineteenth resistor and a twentieth resistor, a first end of the nineteenth resistor is connected to the positive electrode of the ± 15V dc power supply terminal and the first input terminal of the operational amplifier, a control terminal of the operational amplifier is connected to the OP-OUT terminal and the first end of the seventeenth capacitor, a second end of the seventeenth capacitor is grounded, a second input terminal of the operational amplifier is connected to the negative electrode of the ± 15V dc power supply terminal and the first end of the twentieth resistor, a second end of the twentieth resistor is connected to the first end of the first sliding rheostat and the negative output terminal of the operational amplifier after being connected to the second sliding rheostat in series, a second end of the first sliding rheostat is connected to the second end of the nineteenth resistor, and a positive output terminal of the operational amplifier is grounded.
Preferably, the manual double-gear switching circuit comprises a single-pole double-throw switch and an eighteenth capacitor, wherein a first end of the eighteenth capacitor is respectively connected with a first end of the single-pole double-throw switch and a negative electrode of a thirteenth diode, a second end of the eighteenth capacitor is respectively connected with a second end of the single-pole double-throw switch and a positive electrode of a fourteenth diode, an automatic adjustment mode is adopted when two control ends of the single-pole double-throw switch are respectively connected with a first control end and a first control end of a primary voltage stabilizing circuit, and a manual adjustment mode is adopted when two control ends of the single-pole double-throw switch are respectively connected with an output end and a grounding end of an operational amplifier.
Compared with the prior art, the invention has the beneficial effects that:
the invention can provide +/-15V two-path high-precision high-symmetry output voltage for the tested equipment, adopts four high-precision low-temperature-drift metal platinum resistors, samples the zero position of output positive and negative voltages by the four resistors, sends the sampled zero position to the reverse end of a high-performance domestic SE158 operational amplifier, compares the sampled zero position with the absolute zero position, controls the adjusting end of a voltage stabilizing circuit after error amplification, achieves the function of automatically adjusting the output positive and negative voltages, realizes the purpose of positive and negative high-precision symmetry, ensures the symmetry of the output voltage, detects and displays the output current in real time by adopting an SE724 Hall current sensor, and realizes the index that the current detection precision can reach 0.2 percent.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic structural diagram of a null position testing device based on a dual operational amplifier and a hall current sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an R-type transformer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a rectifier circuit, a filter circuit, a series linear voltage regulator circuit, an over-current protection circuit, and a current detection circuit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a temperature control circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an automatic gear tracking circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a manual two-gear switching circuit according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of a primary voltage regulator circuit according to an embodiment of the invention.
FIG. 8 is a schematic diagram of a secondary voltage regulator circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, the terms describing the positional relationships in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a" \8230; "does not exclude the presence of additional like elements in a process, article, or apparatus that comprises the element.
The embodiment of the invention provides an electric zero position testing device based on a double operational amplifier and a Hall current sensor, which comprises a 220V/50Hz input voltage end, an R-type transformer circuit, a rectifying circuit, a filter circuit, a series linear voltage stabilizing circuit, an overcurrent protection circuit, a current detection circuit, a first-stage voltage stabilizing circuit, a second-stage voltage stabilizing circuit, a temperature control circuit, an electric zero position automatic regulating circuit and a manual double-stage switching circuit, wherein 220V/50Hz alternating current is output from the 220V/50Hz input voltage end and passes through the R-type transformer circuit to output a +/-28V alternating current power supply, the R-type transformer circuit outputs a +/-28V alternating current power supply through the rectifying circuit and the filter circuit to obtain +/-28V direct current voltage, the +/-28V stable voltage is obtained through the series linear voltage stabilizing circuit, the +/-24V direct current power supply is output through the first-stage voltage stabilizing circuit, the +/-15V direct current power supply is output through the second-stage voltage stabilizing circuit, the temperature control circuit is connected to the 220V/50Hz input voltage end and is used for inhibiting the output voltage increase to cause output voltage, the negative voltage of the output, the output by the series linear voltage stabilizing circuit is connected to the overcurrent protection circuit and used for preventing the overcurrent detection circuit, the overcurrent detection circuit from being connected to the automatic voltage adjustment, the positive voltage adjustment, the automatic voltage adjustment circuit, the automatic zero position detection circuit and the automatic adjustment circuit, and the automatic zero position adjustment circuit, and the automatic adjustment of the mirror image adjustment.
The R-type transformer circuit comprises an R-type transformer T, a power supply main switch S1 and a fuse F1, wherein a live wire AC-L at a 220V/50Hz input voltage end is connected with the power supply main switch S1 in series and then connected with a first input end of the R-type transformer T, and a zero wire AC-N at a 220V/50Hz input voltage end is connected with the fuse F1 in series and then connected with a second input end of the R-type transformer T.
The rectifier circuit comprises a rectifier BD1, a first input end of the rectifier BD1 is connected with a positive electrode output end + AC28V of the R-type transformer T, and a second input end of the rectifier BD1 is connected with a negative electrode output end-AV 28V of the R-type transformer T;
the filter circuit comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6, wherein a first end of the first capacitor C1 is connected with a positive output end of the rectifier BD1, a first end of the third capacitor C3 and a first end of the fifth capacitor C5 respectively, a first end of the second capacitor C2 is connected with a negative output end of the rectifier BD1, a first end of the fourth capacitor C4 and a first end of the sixth capacitor C6 respectively, a second end of the first capacitor C1 is connected with a second end of the second capacitor C2, a second end of the third capacitor C3 is connected with a second end of the fourth capacitor C4, and a second end of the fifth capacitor C5 is connected with a second end of the sixth capacitor C6.
The series linear voltage stabilizing circuit comprises a first diode ZD1, a second diode ZD2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11 and a twelfth capacitor C12, wherein the anode of the first diode ZD1 is connected with the cathode of the second diode ZD2, the ground GND of the R-type transformer T, the first end of the seventh capacitor C7, the first end of the eighth capacitor C8, the first end of the ninth capacitor C9, the first end of the tenth capacitor C10, the first end of the eleventh capacitor C11 and the first end of the twelfth capacitor C12, the cathode of the first diode ZD1 is connected with the first end of the first resistor R1 and the first end of the third resistor R3, respectively, the second end of the first resistor R1 is connected with the first end of the fifth capacitor C5, and the anode of the second resistor ZD2 is connected with the first end of the second resistor ZD2 and the first end of the sixth resistor R6, respectively.
The overcurrent protection circuit comprises a first triode T1, a second triode T2, a third triode T3, a fourth triode T4, a fifth triode T5, a sixth triode T6, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15 and a sixteenth resistor R16, wherein the base of the first triode T1 is respectively connected with the collector of the third triode T3, the second end of the seventh capacitor C7, the second end of the third resistor R3 and the base of the fifth triode T5, the collector of the fifth triode T5 is respectively connected with the collector of the first triode T1 and the second end of the first resistor R1, the emitter of the fifth triode R5 is respectively connected with the collector of the fifth resistor R5 in series, the emitter of the fifth resistor R5 is respectively connected with the first triode T2 and the collector of the seventh resistor R6, the collector of the sixth resistor R6 and the collector of the sixth resistor R4, the emitter of the sixth triode T2 is respectively connected with the emitter of the sixth resistor R6 in series with the collector of the seventh resistor R7, and the collector of the sixth resistor R2, and the second end of the sixth resistor R6, and the collector of the second resistor R6 are respectively connected with the collector of the sixth triode T4, and the second resistor R2 of the sixth resistor T4 in series, a collector of the sixth triode R6 is connected in series with the twelfth resistor R12 and then respectively connected with a base of the fourth triode T4, a first end of the fourteenth resistor R14, a first end of the fifteenth resistor R15, and a first end of the sixteenth resistor R16, and an emitter of the second triode T2 is connected in series with the eleventh resistor R11 and the thirteenth resistor R13 in sequence and then respectively connected with a second end of the fourteenth resistor R14, a second end of the fifteenth resistor R15, a second end of the sixteenth resistor R16, an emitter of the fourth triode T4, a second end of the tenth capacitor C10, and a second end of the twelfth capacitor C12 and then outputs a 28V negative dc current.
The current detection circuit comprises a first Hall current sensor IC1, a second Hall current sensor IC2, a first detection end J1, a second detection end J2, a first light emitting diode LED1, a second light emitting diode LED2, a seventeenth resistor R17, an eighteenth resistor R18, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15 and a sixteenth capacitor C16, wherein the IP + end of the first Hall current sensor IC1 is connected with the emitter of the third triode T3, the VCC end of the first Hall current sensor IC1 is respectively connected with the first end of the thirteenth capacitor C13, the first end of the seventeenth resistor R17 and the 5V end of the first detection end J1, the second end of the thirteenth capacitor C13 is connected with the cathode of the first light emitting diode LED1 and is grounded GND, the anode of the first light emitting diode LED1 is connected with the seventeenth end of the resistor R17, the terminal VIOUT of the first hall current sensor IC1 is connected with the terminal VOUT1 of the first detection terminal J1, the terminal FILTER of the first hall current sensor IC1 is connected in series with the fourteenth capacitor C14 and then respectively connected with the terminal GND of the first detection terminal J1 and the terminal GND of the first hall current sensor IC1 and then grounded, the IP + terminal of the second hall current sensor IC2 is connected with the emitter of the fourth triode T4, the terminal VCC of the second hall current sensor IC2 is respectively connected with the first terminal of the fifteenth capacitor C15, the first terminal of the eighteenth resistor R18 and the 5V terminal of the second detection terminal J2, the second terminal of the fifteenth capacitor C15 is connected with the cathode of the second light emitting diode LED2 and grounded, the anode of the second light emitting diode LED2 is connected with the second terminal of the eighteenth resistor R18, the terminal out of the second hall current sensor IC2 is connected with the terminal VOUT2 of the second detection terminal J2, the FILTER end of the second hall current sensor IC2 is connected in series with the sixteenth capacitor C16, then is connected with the GND end of the second detection end J2 and the GND end of the second hall current sensor IC2, and then is connected with the GND end of the second detection end J2 and the GND end of the second hall current sensor IC2, the IP-end of the first hall current sensor IC1 is a 28V positive output end, and the IP-end of the second hall current sensor IC2 is a 28V negative output end.
The first-stage voltage stabilizing circuit comprises a first voltage stabilizer U1, a second voltage stabilizer U2, a third voltage stabilizer U3, a fourth voltage stabilizer U4, a fifth voltage stabilizer U5, a sixth voltage stabilizer U6, a seventh voltage stabilizer U7, an eighth voltage stabilizer U8, a ninth voltage stabilizer U9, a tenth voltage stabilizer U10, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a twelfth diode D10, an eleventh diode D11, a twelfth diode D12, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-second capacitor C29, a thirty-third capacitor C30, a thirty-fourth capacitor C31, a thirty-fourth capacitor C33, a thirty-fourth capacitor C34, the negative ground GND of the eleventh diode D11, the positive electrode of the eleventh diode D11 is connected to the ADJ terminal of the first regulator U1, the first terminal of the nineteenth capacitor C19, the ADJ terminal of the second regulator U2, the first terminal of the twentieth capacitor C20, the ADJ terminal of the third regulator U3, the first terminal of the twenty-first capacitor C21, the ADJ terminal of the fourth regulator U4, the first terminal of the twenty-second capacitor C22, the ADJ terminal of the fifth regulator U5, and the first terminal of the twenty-third capacitor C23, the IN terminal of the first regulator U1 is connected to the IN terminal of the second regulator U2, the IN terminal of the third regulator U3, the IN terminal of the fourth regulator U4, and the first terminal of the twenty-fourth capacitor C24, respectively, the second terminal of the nineteenth capacitor C19 is connected to the OUT terminal of the first regulator U1 and the first diode D1, respectively The second end of the twentieth capacitor C20 is respectively connected with the OUT end of the second voltage stabilizer U2 and the anode of the second diode D2, the second end of the twenty-first capacitor C21 is respectively connected with the OUT end of the third voltage stabilizer U3 and the anode of the third diode D3, the second end of the twenty-second capacitor C22 is respectively connected with the OUT end of the fourth voltage stabilizer U4 and the anode of the fourth diode D4, the second end of the twenty-third capacitor C23 is respectively connected with the OUT end of the fifth voltage stabilizer U5 and the anode of the fifth diode D5, the cathode of the first diode D1 is respectively connected with the cathode of the second diode D2, the cathode of the third diode D3, the cathode of the fourth diode D4, the cathode of the fifth diode D5, the first end of the twenty-sixth capacitor C26, the first end of the twenty-eighth capacitor C28 and the anode output end of 24V, a second end of the twenty-sixth capacitor C26 is connected to a second end of the twenty-fourth capacitor C24, a first end of the twenty-fifth capacitor C25, a first end of the twenty-seventh capacitor C27, a second end of the twenty-eighth capacitor C28, and a first end of the twenty-ninth capacitor C29, a second end of the twenty-seventh capacitor C27 is connected to a second end of the twenty-ninth capacitor C29, a negative output terminal of 24V, an anode of the sixth diode D6, an anode of the seventh diode D7, an anode of the eighth diode D8, an anode of the ninth diode D9, and an anode of the twelfth diode D10, a cathode of the sixth diode D6 is connected to an OUT terminal of the sixth regulator U6 and a first end of the thirty-capacitor C30, a second end of the thirty-capacitor C30 is connected to an ADJ terminal of the sixth regulator U6, a first end of the thirty-capacitor C31, a first end of the seventh regulator U7, a second end of the ADJ capacitor C32 of the eighth capacitor C8, a second end of the thirty-second capacitor C32, an ADJ terminal of a ninth voltage regulator U9, a first terminal of a thirty-third capacitor C33, an ADJ terminal of a tenth voltage regulator U10, a first terminal of a thirty-fourth capacitor C34, and a cathode of a twelfth diode D12 are connected, a positive terminal of the twelfth diode D12 is grounded GND, a second terminal of the thirty-first capacitor C31 is connected to a cathode of the seventh diode D7 and an OUT terminal of the seventh voltage regulator U7, respectively, a second terminal of the thirty-second capacitor C32 is connected to a cathode of the eighth diode D8 and an OUT terminal of the eighth voltage regulator U8, respectively, a second terminal of the thirty-third capacitor C33 is connected to a cathode of the ninth diode D9 and an OUT terminal of the ninth voltage regulator U9, respectively, a second terminal of the thirty-fourth capacitor C34 is connected to a cathode of the twelfth diode D10 and an IN terminal of the tenth voltage regulator U10, respectively, an IN terminal of the fifth voltage regulator U5 is connected to an IN terminal of 28V, an IN terminal of the sixth U6 is connected to a cathode output terminal of 28V, and an IN terminal of the fifth capacitor C25 is connected to an anode terminal of the seventh voltage regulator U7, the eighth voltage regulator U8, the ninth voltage regulator U9, the tenth voltage regulator U8, and the eighth voltage regulator U8.
The two-stage voltage stabilizing circuit comprises a thirteenth diode D13, a fourteenth diode D14, a fifteenth diode D15, a sixteenth diode D16, a seventeenth diode D17, an eighteenth diode D18, a nineteenth diode D19, a twentieth diode D20, a twenty-first diode D21, a twenty-second diode D22, a twenty-third diode D23, a twenty-fourth diode D24, a twenty-fifth diode D25, a twenty-sixth diode D26, a twenty-seventh diode D27, a twenty-eighth diode D28, a twenty-ninth diode D29, a thirty-third diode D30, a thirty-eleventh diode D31, a thirty-second diode D32, an eleventh voltage regulator U11, a twelfth voltage regulator U12, a thirteenth voltage regulator U13, a fourteenth voltage regulator U14, a fifteenth voltage regulator U15, a sixteenth voltage regulator U16, a seventeenth voltage regulator U17, an eighteenth voltage regulator U18, a nineteenth voltage regulator U19, a twenty-ninth voltage regulator U20, a thirty-fifth capacitor C35, a thirty-sixth capacitor C36, a thirty-sixth capacitor C37, a thirty-sixth capacitor C38, a thirty-ninth capacitor C40, a forty-ninth capacitor C46, a forty-forty capacitor C48, the cathode of the thirteenth diode D13 is connected to the 785-ADJ terminal, and the anode of the thirteenth diode D13 is connected to the first terminal of the thirty-fifth capacitor C35, the ADJ terminal of the eleventh regulator U11, the first terminal of the thirty-sixth capacitor C36, the ADJ terminal of the twelfth regulator U12, the first terminal of the thirty-seventh capacitor C37, the ADJ terminal of the thirteenth regulator U13, the first terminal of the thirty-eighth capacitor C38, the ADJ terminal of the thirty-fifth capacitor C35, the ADJ terminal of the eleventh regulator U11, the ADJ terminal of the thirty-sixth capacitor C36, the ADJ terminal of the twelfth regulator U12, the ADJ terminal of the thirty-seventh capacitor C37, the ADJ terminal of the thirty-eighth capacitor C38, the ADJ terminal of the thirteenth regulator U13, the second terminal of the thirty-eighth capacitor C38, the second terminal of the fifth capacitor C35, the sixth terminal of the eleventh regulator U12, the eleventh regulator, the eleventh capacitor C36, and the sixth capacitor C36, an ADJ terminal of the fourteenth voltage regulator U14, a first terminal of a thirty-ninth capacitor C39 and an ADJ terminal of the fifteenth voltage regulator U15 are connected, a second terminal of the thirty-fifth capacitor C35 is connected to an anode of the fifteenth diode D15 and an OUT terminal of the eleventh voltage regulator U11, a second terminal of the thirty-sixth capacitor C36 is connected to an anode of the sixteenth diode D16 and an OUT terminal of the twelfth voltage regulator U12, a second terminal of the thirty-seventh capacitor C37 is connected to an anode of the seventeenth diode D17 and an OUT terminal of the thirteenth voltage regulator U13, a second terminal of the thirty-eighth capacitor C38 is connected to an anode of the eighteenth diode D18 and an OUT terminal of the fourteenth voltage regulator U14, a second terminal of the thirty-ninth capacitor C39 is connected to an anode of the nineteenth diode D19 and an OUT terminal of the fifteenth voltage regulator U15, a cathode of the fifteenth diode D15 is connected to a cathode of the sixteenth diode D16, a cathode of the seventeenth diode D17, a cathode of the eighteenth diode D18, a cathode of the nineteenth diode D19, a first end of the forty-second capacitor C42, a first end of the forty-fourth capacitor C44, an anode of the twenty-fifth diode D25, an anode of the twenty-sixth capacitor D26, an anode of the twenty-seventh capacitor C27, and an anode of the twenty-eighth diode D28, a cathode of the twenty-fifth diode D25 is connected to a cathode of the twenty-sixth diode D26, a cathode of the twenty-seventh diode D27, a cathode of the twenty-eighth diode D28, and a third end of ± 15V direct current, an IN end of the eleventh regulator U11 is connected to an IN end of the twelfth regulator U12, an IN end of the thirteenth regulator U13, an IN end of the fourteenth regulator U14, an IN end of the fifteenth regulator U15, a first end of the forty-capacitor C40, and an anode of the 24V, the second end of the forty-third capacitor C43 is connected to the second end of the forty-fifth capacitor C45, the cathode of the twenty-ninth diode D29, the cathode of the thirty-fourth diode D30, the cathode of the thirty-first diode D31, the cathode of the thirty-second diode D32, the anode of the twenty-second diode D20, the anode of the twenty-first diode D21, the anode of the twenty-second diode D22, the anode of the twenty-third diode D23 and the anode of the twenty-fourth diode D24 respectively, and then is connected to ground GND, the anode of the twenty-ninth diode D29 is connected to the first end of the ± 15V dc power source, the anode of the thirty-first diode D30, the anode of the thirty-first diode D1, and the anode of the thirty-second diode D32, the IN terminal of the sixteenth regulator U16 is connected to the 24V negative output terminal, the second terminal of the forty-first capacitor C41 is connected to the IN terminal of the seventeenth regulator U17, the IN terminal of the eighteenth regulator U18, the IN terminal of the nineteenth regulator U19, and the IN terminal of the twentieth regulator U20, the first terminal of the forty-sixth capacitor C46 is connected to the cathode of the twentieth diode D20 and the OUT terminal of the sixteenth regulator U16, the second terminal of the forty-sixth capacitor C46 is connected to the ADJ terminal of the sixteenth regulator U16, the first terminal of the forty-seventh capacitor C47, the ADJ terminal of the seventeenth regulator U17, the first terminal of the forty-eighth capacitor C48, the ADJ terminal of the eighteenth regulator U18, and the forty-ninth terminal of the capacitor C49, an ADJ terminal of the nineteenth voltage regulator U19, a first terminal of the fifty-first capacitor C50, and an ADJ terminal of the twentieth voltage regulator U20 are connected, a second terminal of the forty-sixth capacitor C46 is connected to a cathode of the twentieth diode D20 and an OUT terminal of the sixteenth voltage regulator U16, a second terminal of the forty-seventh capacitor C47 is connected to a cathode of the twenty-first diode D21 and an OUT terminal of the seventeenth voltage regulator U17, a second terminal of the forty-eighth capacitor C48 is connected to a cathode of the twenty-second diode D22 and an OUT terminal of the eighteenth voltage regulator U18, a second terminal of the forty-ninth capacitor C49 is connected to a cathode of the twenty-third diode D23 and an OUT terminal of the nineteenth voltage regulator U19, and a second terminal of the fifty-first capacitor C50 is connected to a cathode of the twenty-fourth diode D24 and an OUT terminal of the twentieth voltage regulator U20.
The temperature control circuit comprises a FAN FAN, a seventh triode T7, a temperature sensor TH1, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26 and a twenty-seventh resistor R27, wherein the first end of the twenty-first resistor R21 is respectively connected with the 12V power output end and the first end of the twenty-second resistor R22, the second end of the twenty-first resistor R21 is respectively connected with the second end of the twenty-second resistor R22, the first end of the FAN FAN and the first end of the temperature sensor TH1, the second end of the temperature sensor TH1 is connected to the first end of a twenty-third resistor R23 and the first end of a twenty-fourth resistor R24, the second end of the twenty-third resistor R23 is connected to the base of a seventh triode T7, the collector of the seventh triode T7 is connected to the second end of the FAN, the first end of a twenty-fifth resistor R25, the first end of a twenty-sixth resistor R26 and the first end of a twenty-seventh resistor R27, and the emitter of the seventh triode T7 is connected to the second end of the twenty-fourth resistor R24, the second end of the twenty-fifth resistor R25, the second end of the twenty-sixth resistor R26 and the second end of the twenty-seventh resistor R27, and then grounded to GND.
The automatic zero-position adjusting circuit comprises an operational amplifier Q1, a first sliding rheostat VR1, a second sliding rheostat VR2, a seventeenth capacitor C17, a nineteenth resistor R19 and a twentieth resistor R20, wherein a first end of the nineteenth resistor R19 is respectively connected with a positive electrode of a +/-15V direct-current power supply end and a first input end of the operational amplifier Q1, a control end of the operational amplifier Q1 is respectively connected with an OP-OUT end and a first end of the seventeenth capacitor C17, a second end of the seventeenth capacitor C17 is grounded GND, a second input end of the operational amplifier Q1 is respectively connected with a negative electrode of the +/-15V direct-current power supply end and a first end of the twentieth resistor R20, a second end of the twentieth resistor R20 is connected with the second sliding rheostat VR2 in series and then respectively connected with a first end of the first sliding rheostat VR1 and a negative electrode output end of the operational amplifier Q1, a second end of the first sliding rheostat VR1 is connected with a second end of the nineteenth resistor C19, and a positive electrode of the operational amplifier Q1 is grounded GND.
The manual double-gear switching circuit comprises a single-pole double-throw switch S2 and an eighteenth capacitor C18, wherein the first end of the eighteenth capacitor C18 is respectively connected with the first end of the single-pole double-throw switch S2 and the negative electrode of a thirteenth diode D13, the second end of the eighteenth capacitor C18 is respectively connected with the second end of the single-pole double-throw switch S2 and the positive electrode of a fourteenth diode D14, when two control ends of the single-pole double-throw switch S2 are respectively connected with a first control end VAR1 and a first control end VAR2 of a primary voltage stabilizing circuit, the manual double-gear switching circuit is in an automatic adjusting mode, and when two control ends of the single-pole double-throw switch S2 are respectively connected with an output end OP-OUT and a grounding end GND of an operational amplifier, the manual adjusting mode is adopted.
The working principle of the invention is as follows:
1-6, the input stage employs an R-type transformer T, converting 220V + -10% 50Hz AC voltage to + -28V AC voltage; the +/-28V alternating-current voltage is converted into +/-28V direct-current voltage through a series linear voltage stabilizer; an over-current protection circuit is arranged at the rear end of the +/-28V direct-current voltage, and when the current exceeds 0.8A, protection is output; the rear end of the protection circuit adopts a +/-28V three-terminal voltage stabilizer to carry out primary voltage stabilization, a +/-24V three-terminal voltage stabilizer to carry out secondary voltage stabilization, and an adjustable +/-15V three-terminal voltage stabilizing circuit carries out output.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (10)

1. The electric zero position testing device is characterized by comprising a 220V/50Hz input voltage end, an R-type transformer circuit, a rectifying circuit, a filter circuit, a series linear voltage stabilizing circuit, an overcurrent protection circuit, a current detection circuit, a primary voltage stabilizing circuit, a secondary voltage stabilizing circuit, a temperature control circuit, an electric zero position automatic regulating circuit and a manual double-gear switching circuit, wherein 220V/50Hz alternating current is output from the 220V/50Hz input voltage end and passes through the R-type transformer circuit to output a +/-28V alternating current power supply, the R-type transformer circuit outputs the +/-28V alternating current power supply and passes through the rectifying circuit and the filter circuit to obtain +/-28V direct current voltage, the +/-28V stable voltage is output through the series linear voltage stabilizing circuit and then outputs a +/-24V direct current power supply through the primary voltage stabilizing circuit, the +/-15V direct current power supply is output through the secondary voltage stabilizing circuit, the temperature control circuit is connected to the 220V/50Hz input voltage end and used for inhibiting fluctuation of output voltage caused by temperature rise, the overcurrent protection circuit is connected to the series linear voltage stabilizing circuit and used for preventing negative voltage, the overcurrent detection circuit is connected to the overcurrent adjustment circuit and used for automatically detecting zero position offset when the positive voltage and the automatic voltage adjustment of the double-gear adjustment circuit and the automatic voltage adjustment circuit is carried out by the manual double-gear offset, and the automatic mirror image adjustment of the automatic voltage adjustment.
2. The null-position testing device based on the dual operational amplifiers and the hall current sensor as claimed in claim 1, wherein the R-type transformer circuit comprises an R-type transformer, a main power switch and a fuse, the live wire of the 220V/50Hz input voltage end is connected in series with the main power switch and then connected with the first input end of the R-type transformer, and the neutral wire of the 220V/50Hz input voltage end is connected in series with the fuse and then connected with the second input end of the R-type transformer.
3. The null position test device based on the dual operational amplifiers and the Hall current sensor as claimed in claim 2,
the rectifier circuit comprises a rectifier, a first input end of the rectifier is connected with the positive output end of the R-type transformer, and a second input end of the rectifier is connected with the negative output end of the R-type transformer;
the filter circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor, wherein the first end of the first capacitor is respectively connected with the positive electrode output end of the rectifier, the first end of the third capacitor and the first end of the fifth capacitor, the first end of the second capacitor is respectively connected with the negative electrode output end of the rectifier, the first end of the fourth capacitor and the first end of the sixth capacitor, the second end of the first capacitor is connected with the second end of the second capacitor, the second end of the third capacitor is connected with the second end of the fourth capacitor, and the second end of the fifth capacitor is connected with the second end of the sixth capacitor.
4. The dual-operational-amplifier and Hall current sensor based null-bit test device of claim 3, wherein the series linear voltage regulator circuit comprises a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor, wherein an anode of the first diode is connected with a cathode of the second diode, a ground terminal of the R-type transformer, a first terminal of the seventh capacitor, a first terminal of the eighth capacitor, a first terminal of the ninth capacitor, a first terminal of the tenth capacitor, a first terminal of the eleventh capacitor and a first terminal of the twelfth capacitor, a cathode of the first diode is connected with a first terminal of the first resistor and a first terminal of the third resistor, respectively, a second terminal of the first resistor is connected with a first terminal of the fifth capacitor, an anode of the second diode is connected with a first terminal of the second resistor and a first terminal of the fourth resistor, respectively, and a first terminal of the sixth capacitor.
5. The dual-operational-amplifier and Hall current sensor based electric-null test device according to claim 4, wherein the over-current protection circuit comprises a first triode, a second triode, a third triode, a fourth triode, a fifth triode, a sixth triode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor, wherein a base of the first triode is connected with a collector of the third triode, a second end of the seventh capacitor, a second end of the third resistor and a base of the fifth triode respectively, and a collector of the fifth triode is connected with a collector of the first triode and a second end of the first resistor respectively, an emitter of the fifth triode is connected with the fifth resistor in series and then is respectively connected with a first end of the seventh resistor, a first end of the eighth resistor, a first end of the ninth resistor and a base of the third triode, an emitter of the first triode is connected with the sixth resistor and the tenth resistor in series in sequence and then is respectively connected with a second end of the seventh resistor, a second end of the eighth resistor, a second end of the ninth resistor, an emitter of the third triode, a second end of the ninth resistor and a second end of the eleventh capacitor, a base of the second triode is respectively connected with a second end of the eighth capacitor, a second end of the fourth resistor, a base of the sixth triode and a collector of the fourth triode, a collector of the sixth triode is respectively connected with a collector of the second triode and a second end of the second resistor, a collector of the sixth triode is connected with the twelfth resistor in series and then is respectively connected with a base of the fourth triode, the emitter of the second triode is connected with the eleventh resistor and the thirteenth resistor in series in sequence and then connected with the second end of the fourteenth resistor, the second end of the fifteenth resistor, the second end of the sixteenth resistor, the emitter of the fourth triode, the second end of the tenth capacitor and the second end of the twelfth capacitor respectively.
6. The apparatus of claim 5, wherein the current detection circuit comprises a first Hall current sensor, a second Hall current sensor, a first detection terminal, a second detection terminal, a first light emitting diode, a second light emitting diode, a seventeenth resistor, an eighteenth resistor, a thirteenth capacitor, a fourteenth capacitor, a seventeenth resistor and a sixteenth capacitor, wherein the IP + terminal of the first Hall current sensor is connected to the emitter of the third transistor, the VCC terminal of the first Hall current sensor is connected to the first terminal of the thirteenth capacitor, the first terminal of the seventeenth resistor and the 5V terminal of the first detection terminal, the second terminal of the thirteenth capacitor is connected to the cathode of the first light emitting diode and grounded, the anode of the first light emitting diode is connected to the second terminal of the seventeenth resistor, the VIOUT terminal of the first Hall current sensor is connected to the 1 terminal of the first detection terminal, the FILTER terminal of the first Hall current sensor is connected in series with the fourteenth capacitor and the second terminal of the fourteenth resistor, the VIOUT terminal of the first Hall current sensor is connected to the cathode of the second light emitting diode and the emitter of the second resistor, the VOUT terminal is connected to the emitter of the second detection terminal of the second Hall current sensor, the eighteenth resistor and the emitter are connected to the emitter of the second detection terminal of the second Hall current sensor, the second detection terminal of the VOUT is connected to the emitter of the second diode and the emitter of the second detection terminal of the second Hall current sensor, and the FILTER end of the second Hall current sensor is connected in series with the sixteenth capacitor and then is respectively connected with the GND end of the second detection end and the GND end of the second Hall current sensor and then is grounded.
7. The dual operational amplifier and Hall current sensor based null position test apparatus of claim 6, wherein the primary voltage regulator circuit comprises a first voltage regulator, a second voltage regulator, a third voltage regulator, a fourth voltage regulator, a fifth voltage regulator, a sixth voltage regulator, a seventh voltage regulator, an eighth voltage regulator, a ninth voltage regulator, a tenth voltage regulator, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a ninth diode, a twelfth diode, an eleventh diode, a twelfth diode, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a twenty-ninth capacitor, a thirty-third capacitor, a thirty-second capacitor, a thirty-third capacitor, a thirty-fourth capacitor, the cathode of the eleventh diode is grounded, the anode of the eleventh diode is respectively connected with the ADJ end of the first voltage stabilizer, the first end of the nineteenth capacitor, the ADJ end of the second voltage stabilizer, the first end of the twentieth capacitor, the ADJ end of the third voltage stabilizer, the first end of the twenty-first capacitor, the ADJ end of the fourth voltage stabilizer, the first end of the twenty-second capacitor, the ADJ end of the fifth voltage stabilizer and the first end of the twenty-third capacitor, the IN end of the first voltage stabilizer is respectively connected with the IN end of the second voltage stabilizer, the IN end of the third voltage stabilizer, the IN end of the fourth voltage stabilizer and the first end of the twenty-fourth capacitor, the second end of the nineteenth capacitor is respectively connected with the OUT end of the first voltage stabilizer and the anode of the first diode, the second end of the twenty-first capacitor is respectively connected with the OUT end of the second voltage stabilizer and the anode of the second diode, the second end of the twenty-second capacitor is respectively connected with the OUT end of the third voltage stabilizer and the anode of the third diode, the second end of the twenty-second capacitor is respectively connected with the OUT end of the fourth voltage stabilizer and the anode of the fourth diode, the second end of the twenty-third capacitor is respectively connected with the OUT end of the fifth voltage stabilizer and the anode of the fifth diode, the cathode of the first diode is respectively connected with the cathode of the second diode, the cathode of the third diode, the cathode of the fourth diode, the cathode of the fifth diode, the first end of the twenty-sixth capacitor, the first end of the twenty-eighth capacitor and the 24V anode output end, the second end of the twenty-sixth capacitor is respectively connected with the second end of the twenty-fourth capacitor, the first end of the twenty-fifth capacitor, the first end of the twenty-seventh capacitor, the second end of the twenty-eighth capacitor and the first end of the twenty-ninth capacitor, the second end of the twenty-seventh capacitor is respectively connected with the second end of the twenty-ninth capacitor, the 24V negative output end, the anode of the sixth diode, the anode of the seventh diode, the anode of the eighth diode, the anode of the ninth diode and the anode of the twelfth diode, the cathode of the sixth diode is respectively connected with the OUT end of the sixth voltage stabilizer and the first end of the thirtieth capacitor, the second end of the thirtieth capacitor is respectively connected with the ADJ end of the sixth voltage stabilizer, the first end of the thirty-eleventh capacitor, the ADJ end of the seventh voltage stabilizer, the ADJ end of the eighth voltage stabilizer, the first end of the thirty-second capacitor, the ADJ end of the ninth voltage stabilizer, the first end of the thirty-third capacitor, the ADJ end of the tenth voltage stabilizer, the first end of the twenty-ninth voltage stabilizer, the, the first end of a thirty-fourth capacitor is connected with the cathode of a twelfth diode, the anode of the twelfth diode is grounded, the second end of the thirty-first capacitor is connected with the cathode of a seventh diode and the OUT end of a seventh voltage stabilizer respectively, the second end of the thirty-second capacitor is connected with the cathode of an eighth diode and the OUT end of an eighth voltage stabilizer respectively, the second end of the thirty-third capacitor is connected with the cathode of a ninth diode and the OUT end of a ninth voltage stabilizer respectively, the second end of the thirty-fourth capacitor is connected with the cathode of a twelfth diode and the OUT end of a tenth voltage stabilizer respectively, the IN end of the fifth voltage stabilizer is connected with a 28V anode output end, the IN end of the sixth voltage stabilizer is connected with a 28V cathode output end, and the second end of the twenty-fifth capacitor is connected with the IN end of the seventh voltage stabilizer, the IN end of the eighth voltage stabilizer, the IN end of the ninth voltage stabilizer and the IN end of the tenth voltage stabilizer respectively.
8. The dual op-amp and hall current sensor based null test device of claim 7 wherein the secondary voltage regulator circuit comprises a thirteenth diode, a fourteenth diode, a fifteenth diode, a sixteenth diode, a seventeenth diode, an eighteenth diode, a nineteenth diode, a twentieth diode, a twenty-first diode, a twenty-second diode, a twenty-third diode, a twenty-fourth diode, a twenty-fifth diode, a twenty-sixth diode, a twenty-seventh diode, a twenty-eighth diode, a twenty-ninth diode, a thirty-eleventh diode, a thirty-second diode, an eleventh regulator, a twelfth regulator, a thirteenth regulator, a fourteenth regulator, a fifteenth regulator, a sixteenth regulator, a seventeenth regulator, an eighteenth regulator, a nineteenth regulator, a twenty-fifth capacitor, a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-ninth capacitor, a forty-fourth capacitor, a forty-first capacitor, a forty-second capacitor, a forty-fourth capacitor, a forty-ninth capacitor, a forty-seventh capacitor, a forty capacitor and a forty-ninth capacitor, the cathode of the thirteenth diode is connected with the 785-ADJ terminal, an anode of the thirteenth diode is connected to the first terminal of the thirty-fifth capacitor, the ADJ terminal of the eleventh regulator, the first terminal of the thirty-sixth capacitor, the ADJ terminal of the twelfth regulator, the first terminal of the thirty-seventh capacitor, the ADJ terminal of the thirteenth regulator, the first terminal of the thirty-eighth capacitor, the ADJ terminal of the fourteenth regulator, the ADJ terminal of the eleventh regulator, the ADJ terminal of the twelfth regulator, the ADJ terminal of the thirteenth regulator, the first terminal of the thirty-eighth capacitor, the second terminal of the fourteenth regulator, the second terminal of the thirteenth regulator, and the second terminal of the thirteenth regulator, respectively, A first end of a thirty-ninth capacitor is connected with an ADJ end of a fifteenth voltage stabilizer, a second end of a thirty-fifth capacitor is respectively connected with an anode of a fifteenth diode and an OUT end of an eleventh voltage stabilizer, a second end of a thirty-sixth capacitor is respectively connected with an anode of a sixteenth diode and an OUT end of a twelfth voltage stabilizer, a second end of a thirty-seventh capacitor is respectively connected with an anode of a seventeenth diode and an OUT end of a thirteenth voltage stabilizer, a second end of a thirty-eighth capacitor is respectively connected with an anode of an eighteenth diode and an OUT end of a fourteenth voltage stabilizer, a second end of the thirty-ninth capacitor is respectively connected with an anode of a nineteenth diode and an OUT end of the fifteenth voltage stabilizer, the negative electrode of the fifteenth diode is respectively connected with the negative electrode of the sixteenth diode, the negative electrode of the seventeenth diode, the negative electrode of the eighteenth diode, the negative electrode of the nineteenth diode, the first end of the forty-second capacitor, the first end of the forty-fourth capacitor, the positive electrode of the twenty-fifth diode, the positive electrode of the twenty-sixth capacitor, the positive electrode of the twenty-seventh capacitor and the positive electrode of the twenty-eighth diode, the negative electrode of the twenty-fifth diode is respectively connected with the negative electrode of the twenty-sixth diode, the negative electrode of the twenty-seventh diode, the negative electrode of the twenty-eighth diode and the third end of a +/-15V direct current power supply end, the IN end of the eleventh voltage stabilizer is respectively connected with the IN end of the twelfth voltage stabilizer, the IN end of the thirteenth voltage stabilizer, the IN end of the fourteenth voltage stabilizer, the IN end of the fifteenth voltage stabilizer, the first end of the forty-voltage stabilizer and the 24V positive output end, the second end of the forty-capacitor is respectively connected with the first end of the forty-first capacitor, the second end of the forty-second capacitor, the second end of the forty-second capacitor, the fourth capacitor, the eighth capacitor and the positive output end of the twenty-fourth capacitor, A first end of a forty-third capacitor, a second end of a forty-fourth capacitor, a first end of a forty-fifth capacitor and a second end of a direct current power supply end of +/-15V are connected and then grounded, a second end of the forty-third capacitor is respectively connected with a second end of the forty-fifth capacitor, a cathode of a twenty-ninth diode, a cathode of a thirty-eleventh diode, a cathode of a thirty-second diode, an anode of a twentieth diode, an anode of a twenty-first diode, an anode of a twenty-third diode and an anode of a twenty-fourth diode, an anode of the twenty-ninth diode is respectively connected with a first end of a direct current power supply end of +/-15V, an anode of the thirty-fourth diode, an anode of the thirty-first diode and an anode of the thirty-second diode, an IN end of the sixteenth regulator is connected with a negative output end of 24V, the second end of the forty-first capacitor is respectively connected with the IN end of the seventeenth voltage stabilizer, the IN end of the eighteenth voltage stabilizer, the IN end of the nineteenth voltage stabilizer and the IN end of the twentieth voltage stabilizer, the first end of the forty-sixth capacitor is respectively connected with the cathode of the twentieth diode and the OUT end of the sixteenth voltage stabilizer, the second end of the forty-sixth capacitor is respectively connected with the ADJ end of the sixteenth voltage stabilizer, the first end of the forty-seventh capacitor, the ADJ end of the seventeenth voltage stabilizer, the first end of the forty-eighth capacitor, the ADJ end of the eighteenth voltage stabilizer, the first end of the forty-ninth capacitor, the ADJ end of the nineteenth voltage stabilizer, the first end of the fifty capacitor and the ADJ end of the twentieth voltage stabilizer, the second end of the forty-sixth capacitor is respectively connected with the cathode of the twentieth diode and the OUT end of the sixteenth voltage stabilizer, the second end of the forty-seventh capacitor is respectively connected with the cathode of the twenty-first diode and the OUT end of the seventeenth voltage stabilizer, the second end of the forty-eighth capacitor is connected with the negative pole of the twenty-second diode and the OUT end of the eighteenth voltage stabilizer respectively, the second end of the forty-ninth capacitor is connected with the negative pole of the twenty-third diode and the OUT end of the nineteenth voltage stabilizer respectively, and the second end of the fifty-fifth capacitor is connected with the negative pole of the twenty-fourth diode and the OUT end of the twentieth voltage stabilizer respectively.
9. The dual-operational-amplifier and hall-current-sensor-based null test device according to claim 8, wherein the temperature control circuit comprises a fan, a seventh triode, a temperature sensor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor and a twenty-seventh resistor, a first end of the twenty-first resistor is connected with the 12V power output end and a first end of the twenty-second resistor, a second end of the twenty-first resistor is connected with a second end of the twenty-second resistor, a first end of the fan and a first end of the temperature sensor, a second end of the temperature sensor is connected with a first end of the twenty-third resistor and a first end of the twenty-fourth resistor, a second end of the twenty-third resistor is connected with a base of the seventh triode, a collector of the seventh triode is connected with a second end of the fan, a first end of the twenty-fifth resistor, a first end of the twenty-sixth resistor and a first end of the twenty-seventh resistor, and an emitter of the twenty-seventh resistor are connected with a second end of the twenty-fourth resistor, a second end of the twenty-fifth resistor and a second end of the twenty-seventh resistor.
10. The dual-operational-amplifier-and-hall-current-sensor-based null test device as claimed in claim 8, wherein the null self-adjusting circuit comprises an operational amplifier, a first sliding rheostat, a second sliding rheostat, a seventeenth capacitor, a nineteenth resistor and a twentieth resistor, wherein a first end of the nineteenth resistor is connected with a positive electrode of a ± 15V dc power supply terminal and a first input end of the operational amplifier respectively, a control end of the operational amplifier is connected with an OP-OUT terminal and a first end of the seventeenth capacitor respectively, a second end of the seventeenth capacitor is grounded, a second input end of the operational amplifier is connected with a negative electrode of a ± 15V dc power supply terminal and a first end of the twentieth resistor respectively, a second end of the twentieth resistor is connected with a first end of the first sliding rheostat and a negative output end of the operational amplifier respectively after being connected with the second sliding rheostat in series, a second end of the first sliding rheostat is connected with a second end of the nineteenth resistor, and a positive output end of the operational amplifier is grounded;
the manual double-gear switching circuit comprises a single-pole double-throw switch and an eighteenth capacitor, wherein the first end of the eighteenth capacitor is connected with the first end of the single-pole double-throw switch and the negative electrode of a thirteenth diode respectively, the second end of the eighteenth capacitor is connected with the second end of the single-pole double-throw switch and the positive electrode of a fourteenth diode respectively, when the two control ends of the single-pole double-throw switch are connected with the first control end and the first control end of the one-level voltage stabilizing circuit respectively, the manual regulation mode is adopted, and when the two control ends of the single-pole double-throw switch are connected with the output end and the grounding end of the operational amplifier respectively, the manual regulation mode is adopted.
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