CN115436689B - Null position testing device based on double operational amplifiers and Hall current sensors - Google Patents
Null position testing device based on double operational amplifiers and Hall current sensors Download PDFInfo
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- CN115436689B CN115436689B CN202211166535.7A CN202211166535A CN115436689B CN 115436689 B CN115436689 B CN 115436689B CN 202211166535 A CN202211166535 A CN 202211166535A CN 115436689 B CN115436689 B CN 115436689B
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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
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- 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
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- 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
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- 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
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Abstract
The invention discloses a zero test 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 automatic zero adjustment circuit and a manual double-gear switching circuit. According to the invention, through adopting the SE158 double operational amplifier with low offset voltage and the low-temperature drift high-precision metal platinum sampling resistor with 25ppm, the function of poor symmetry caused by temperature drift is solved, 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 the SE724 Hall current sensor with domestic high linearity, and the index that the current detection precision can reach 0.2% is realized.
Description
Technical Field
The invention relates to the technical field of null test, in particular to a null test device based on a double operational amplifier and a Hall current sensor.
Background
At present, in the study of the null position, temperature drift is a main factor influencing the null position, the symmetry degree is changed due to temperature change, and the error caused by the temperature drift is not subjected to corresponding closed-loop control processing in the current technical scheme, so that the voltage with good symmetry degree is difficult to obtain at the later stage.
Disclosure of Invention
Therefore, the main objective of the present invention is to provide a null test device based on dual op-amps and hall current sensors.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a zero test device based on double operational amplifiers and Hall current sensors, 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 automatic zero test circuit and a manual dual-gear switching circuit, wherein the 220V/50Hz input voltage end outputs 220V/50Hz alternating current, the 220V/50Hz alternating current is output to an + -28V alternating current power supply after passing through the R-type transformer circuit, the R-type transformer circuit outputs + -28V alternating current, the rectifying circuit and the filter circuit, the R-type transformer circuit obtains + -28V direct current voltage, the series linear voltage stabilizing circuit obtains + -28V stable voltage, the primary voltage stabilizing circuit outputs + -24V direct current power, the secondary voltage stabilizing circuit outputs + -15V direct current power, the temperature control circuit is connected to the 220V/50Hz input voltage end for inhibiting fluctuation of output voltage, the overcurrent protection circuit is connected to the series linear voltage stabilizing circuit, the automatic zero test circuit is used for preventing the overcurrent protection circuit from being connected to the voltage stabilizing circuit, the automatic zero test circuit is used for carrying out the automatic zero test circuit voltage adjustment, the automatic zero test circuit is connected to the voltage level adjustment, the automatic zero test circuit is used for the positive voltage adjustment, the automatic zero test circuit is used for maintaining the voltage, and the automatic zero test circuit is connected to the voltage, and the automatic zero test circuit is used for the voltage level.
The R-type transformer circuit comprises an R-type transformer, a power main switch and a fuse, wherein a live wire of a 220V/50Hz input voltage end is connected with the first input end of the R-type transformer after being connected with the power main switch in series, and a zero wire of the 220V/50Hz input voltage end is connected with the second input end of the R-type transformer after being connected with the fuse in series.
In the invention, the rectifier circuit preferably comprises a rectifier, wherein a first input end of the rectifier is connected with an anode output end of the R-type transformer, and a second input end of the rectifier is connected with a cathode 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.
In the present invention, the series linear voltage stabilizing circuit preferably includes 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 positive electrode of the first diode is connected to the negative electrode of the second diode, the ground terminal 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, respectively, the negative electrode of the first diode is connected to the first end of the first resistor and the first end of the third resistor, the second end of the first resistor is connected to the first end of the fifth capacitor, the positive electrode of the second diode is connected to the first end of the second resistor and the first end of the fourth resistor, respectively, and the second end of the second resistor is connected to the first end of the sixth capacitor.
Preferably, 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 the base electrode of the first triode is respectively connected with the collector electrode of the third triode, the second end of the seventh capacitor, the second end of the third resistor and the base electrode of the fifth triode, the collector electrode of the fifth triode is respectively connected with the collector electrode of the first triode and the second end of the first resistor, the emitter electrode of the fifth triode is respectively connected with the first end of the seventh resistor, the first end of the eighth resistor, the first end of the ninth resistor and the base electrode of the third triode after being connected in series with the fifth resistor, the emitter of the first triode is respectively connected with the second end of the seventh resistor, the second end of the eighth resistor, the second end of the ninth resistor, the emitter of the third triode, the second end of the ninth resistor and the second end of the eleventh capacitor in series after being sequentially connected with the sixth resistor and the tenth resistor, the base of the second triode is respectively connected with the second end of the eighth capacitor, the second end of the fourth resistor, the base of the sixth triode and the collector of the fourth triode, the collector of the sixth triode is respectively connected with the collector of the second triode and the second end of the second resistor, the collector of the sixth triode is respectively connected with the base of the fourth triode, the first end of the fourteenth resistor after being serially connected with the twelfth resistor, the emitter of the second triode is 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 in series in sequence.
Preferably, 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 fifteenth capacitor and a sixteenth capacitor, wherein the IP+ terminal of the first hall current sensor is connected with the emitter of a third triode, the VCC terminal of the first hall current sensor is respectively connected with 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 with the cathode of the first light emitting diode and is grounded, the VIOUT terminal of the first hall current sensor is connected with the VOUT1 terminal of the first detection terminal, the FILTER terminal of the first hall current sensor is respectively connected with the GND terminal of the first detection terminal and the GND terminal of the first hall current sensor in series, the VCC terminal of the second hall current sensor is connected with the eighteenth terminal of the second hall current sensor and the eighteenth capacitor, the second terminal of the VOUT terminal of the second hall current sensor is connected with the second terminal of the eighteenth resistor, the second hall current sensor is connected with the eighteenth terminal of the second hall current sensor is connected with the second detection terminal of the thirteenth transistor, the eighteenth resistor is connected with the second terminal of the thirteenth transistor, the first hall current sensor is connected with the eighteenth terminal of the seventeenth resistor is connected with the second terminal of the seventeenth resistor, the capacitor is connected with the capacitor of the capacitor, and the FILTER end of the second Hall current sensor is connected with the GND end of the second detection end and the GND end of the second Hall current sensor in series and then grounded.
Preferably, the first-stage regulator circuit includes a first regulator, a second regulator, a third regulator, a fourth regulator, a fifth regulator, a sixth regulator, a seventh regulator, an eighth regulator, a ninth regulator, a tenth 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-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 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 positive electrode 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 positive electrode 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 positive electrode of the fifth diode, the negative electrode of the first diode is respectively connected with the negative electrode of the second diode, the negative electrode of the third diode, the negative electrode of the fourth diode, the negative electrode of the fifth diode, the first end of the twenty-sixth capacitor, the first end of the twenty-eighth capacitor and the 24V positive electrode 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 electrode output end, the positive electrode of the sixth diode, the positive electrode of the seventh diode, the positive electrode of the eighth diode, the positive electrode of the ninth diode and the positive electrode of the twelfth diode, the negative electrode of the sixth diode is respectively connected with the OUT end of the sixth voltage stabilizer and the first end of the thirty-eighth capacitor, the second end of the thirty-seventh 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 ADJ end of the thirty-second capacitor of the eighth voltage stabilizer, 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 is connected with 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.
In a preferred embodiment of the present invention, the secondary voltage stabilizing 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-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-second diode, an eleventh voltage stabilizer, a twelfth voltage stabilizer, a twenty-fifth diode, a twenty-sixth diode, a twenty-seventh diode, a thirty-second diode, a thirty-eighth voltage stabilizer, a voltage regulator, a voltage a thirteenth regulator, a fourteenth regulator, a fifteenth regulator, a sixteenth regulator, a seventeenth regulator, an eighteenth regulator, a nineteenth regulator, a twenty-eighth regulator, a thirty-fifth capacitor, a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-ninth 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 forty-ninth capacitor, and a fifty-fifth capacitor, the cathode of the thirteenth diode is connected with 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, the second end of the thirty-fifth capacitor is respectively connected with the positive electrode of the fifteenth diode and the OUT end of the eleventh voltage stabilizer, the second end of the thirty-sixth capacitor is respectively connected with the positive electrode of the sixteenth diode and the OUT end of the twelfth voltage stabilizer, the second end of the thirty-seventh capacitor is respectively connected with the positive electrode of the seventeenth diode and the OUT end of the thirteenth voltage stabilizer, the second end of the thirty-eighth capacitor is respectively connected with the positive electrode of the eighteenth diode and the OUT end of the fourteenth voltage stabilizer, the second end of the thirty-ninth capacitor is respectively connected with the positive electrode of the nineteenth diode and the 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 fortieth capacitor, the first end of the fortieth fourth capacitor, the positive electrode of the twenty-fifth capacitor, the positive electrode of the twenty-sixth 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 the + -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 fortieth capacitor and the 24V positive electrode output end, the second end of the fortieth capacitor is respectively connected with the first end of the fortieth-first capacitor, the second end of the fortieth-second capacitor, the first end of the fortieth-third capacitor, the second end of the fortieth-fourth capacitor, the first end of the forty-fifth capacitor is connected with the second end of the plus or minus 15V direct current power supply end and then grounded, the second end of the forty-third capacitor is respectively connected with the second end of the forty-fifth capacitor, the negative electrode of the twenty-ninth diode, the negative electrode of the thirty-eighth diode, the negative electrode of the thirty-second diode, the positive electrode of the twentieth diode, the positive electrode of the first twenty-second diode, the positive electrode of the twenty-third diode and the positive electrode of the twenty-fourth diode, the positive electrode of the twenty-ninth diode is respectively connected with the first end of the plus or minus 15V direct current power supply end, the positive electrode of the thirty-eighth diode and the positive electrode of the thirty-eighth diode, the IN end of the sixteenth voltage stabilizer is connected with the 24V negative electrode output end, the second end of the forty-sixth 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, 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 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 twentieth 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, the second end of the forty-ninth capacitor is respectively connected with the cathode of the twenty-third diode and the OUT end of the nineteenth voltage stabilizer, and the second end of the fifty-fourth capacitor is respectively connected with the cathode of the twenty-fourth diode and the OUT end of the twenty-eighth voltage stabilizer.
Preferably, 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, wherein the first end of the twenty-first resistor is connected with the 12V power output end and the first end of the twenty-second resistor respectively, the second end of the twenty-first resistor is connected with the second end of the twenty-second resistor, the first end of the fan and the first end of the temperature sensor respectively, the second end of the temperature sensor is connected with the first end of the twenty-third resistor and the first end of the twenty-fourth resistor respectively, the second end of the twenty-third resistor is connected with the base electrode of the seventh triode, the collector electrode of the seventh triode is connected with the second end of the fan, the first end of the twenty-fifth resistor, the first end of the twenty-sixth resistor and the first end of the twenty-seventh resistor respectively, and the second end of the twenty-seventh triode is connected with the second end of the twenty-third resistor, the emitter electrode of the twenty-third resistor and the twenty-fourth triode respectively.
The invention preferably comprises an operational amplifier, a first sliding rheostat, a second sliding rheostat, a seventeenth capacitor, a nineteenth resistor and a twentieth resistor, wherein the first end of the nineteenth resistor is respectively connected with the positive electrode of a direct current power supply end of +/-15V and the first input end of the operational amplifier, the control end of the operational amplifier is respectively connected with the OP-OUT end and the first end of the seventeenth capacitor, the second end of the seventeenth capacitor is grounded, the second input end of the operational amplifier is respectively connected with the negative electrode of the direct current power supply end of +/-15V and the first end of the twentieth resistor, the second end of the twentieth resistor is respectively connected with the first end of the first sliding rheostat and the negative output end of the operational amplifier after being connected with the second sliding rheostat in series, the second end of the first sliding rheostat is connected with the second end of the nineteenth resistor, and the positive electrode output end 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 the first end of the eighteenth capacitor is respectively connected with the first end of the single-pole double-throw switch and the negative electrode of a thirteenth diode, the second end of the eighteenth capacitor is respectively connected with the second end of the single-pole double-throw switch and the positive electrode of a fourteenth diode, and the automatic regulation mode is realized when two control ends of the single-pole double-throw switch are respectively connected with the first control end and the first control end of the primary voltage stabilizing circuit, and the manual regulation mode is realized when the two control ends of the single-pole double-throw switch are respectively connected with the output end and the grounding end of the operational amplifier.
Compared with the prior art, the invention has the beneficial effects that:
the invention can provide two paths of high-precision and high-symmetry output voltages of +/-15V for tested equipment, adopts four high-precision low-temperature drift metal platinum resistors, samples the null position of the output positive and negative voltages, sends the sampled null position to the reverse end of the high-performance domestic SE158 operational amplifier, compares the sampled null position with the absolute zero point, and controls the regulating end of the voltage stabilizing circuit after error amplification to achieve the function of automatically regulating the output positive and negative voltages, thereby realizing the purpose of positive and negative high-precision symmetry, ensuring the symmetry of the output voltages, detecting and displaying the output current in real time by adopting the SE724 Hall current sensor, and realizing the index that the current detection precision can reach 0.2%.
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 embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a null test device based on a dual op-amp and 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 stabilizing circuit, an over-current protection circuit and a current detection circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a temperature control circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a circuit for automatically adjusting null bits according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a manual dual-gear switching circuit according to an embodiment of the invention.
FIG. 7 is a schematic diagram of a primary voltage stabilizing circuit according to an embodiment of the present invention.
FIG. 8 is a schematic diagram of a two-stage voltage stabilizing circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of 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 should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the devices or elements being referred to must have specific directions, be constructed and operated in specific directions, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration, are not to be construed as limitations of the present patent, and the specific meanings of the terms described above may be understood by those of ordinary skill in the art according to specific circumstances.
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 phrase "comprising one … …" does not exclude the presence of other like elements in a process, article or apparatus that comprises the element.
The embodiment of the invention provides a null test device based on double operational amplifiers and Hall current sensors, which is shown in figures 1-6 and 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, a null automatic regulating circuit and a manual dual-gear switching circuit, wherein the 220V/50Hz input voltage end outputs 220V/50Hz alternating current, after passing through the R-type transformer circuit, an + -28V alternating current voltage is obtained after passing through the rectifying circuit and the filter circuit, a 28V stable voltage is obtained after passing through the series linear voltage stabilizing circuit, after passing through the primary voltage stabilizing circuit, a + -24V direct current power supply is output after passing through the secondary voltage stabilizing circuit, the temperature control circuit is connected to the 220V/50 input voltage end for inhibiting fluctuation of the output voltage caused by temperature rise, the overcurrent protection circuit is connected to the 220V/50Hz input voltage end for inhibiting fluctuation of the output voltage, the overcurrent protection circuit is connected to the current stabilizing circuit for detecting the negative voltage, when the positive voltage is automatically regulated by the voltage is in series-type voltage, the positive voltage is automatically regulated by the voltage is automatically, the positive voltage is automatically regulated by the voltage is maintained by the voltage of the voltage regulator circuit, or the voltage is automatically regulated by the voltage is in the mode of the voltage regulator circuit, and the positive voltage is automatically, or the positive-level is automatically regulated by the voltage is kept to be the voltage.
The R-type transformer circuit comprises an R-type transformer T, a power main switch S1 and a fuse F1, wherein the live wire AC-L serial power main switch S1 at the 220V/50Hz input voltage end is connected with the first input end of the R-type transformer T, and the zero line AC-N serial fuse F1 at the 220V/50Hz input voltage end is connected with the second input end of the R-type transformer T.
The rectifying circuit comprises a rectifier BD1, wherein a first input end of the rectifier BD1 is connected with an anode output end +AC28V of the R-type transformer T, and a second input end of the rectifier BD1 is connected with a cathode 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 respectively connected with an anode output end of the rectifier BD1, a first end of the third capacitor C3 and a first end of the fifth capacitor C5, a first end of the second capacitor C2 is respectively connected with a cathode output end of the rectifier BD1, a first end of the fourth capacitor C4 and a first end of the sixth capacitor C6, 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 positive electrode of the first diode ZD1 is connected with the negative electrode 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 respectively, the negative electrode of the first diode ZD1 is connected with the first end of the fifth capacitor C5 respectively, the positive electrode of the first diode ZD2 is connected with the first end of the first resistor R1 and the first end of the third resistor R3 respectively, and the positive electrode of the second diode ZD2 is connected with the first end of the fourth resistor R2 and the first end of the fourth resistor R4 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 electrode of the first triode T1 is respectively connected with the collector electrode of the third triode T3, the second end of a seventh capacitor C7, the second end of the third resistor R3 and the base electrode of the fifth triode T5, the collector electrode of the fifth triode T5 is respectively connected with the collector electrode of the first triode T1 and the second end of the first resistor R1, the emitter of the fifth triode R5 is connected with the first end of a seventh resistor R7, the first end of an eighth resistor R8, the first end of a ninth resistor R9 and the base of a third triode T3 in series, the emitter of the first triode T1 is connected with the second end of the seventh resistor R7, the second end of the eighth resistor R8, the second end of the ninth resistor R9, the emitter of the third triode T3, the second end of the ninth resistor R9 and the second end of an eleventh capacitor C11 in series, respectively, the emitter of the first triode T1 is connected with the second end of the eighth capacitor C8, the second end of the fourth resistor R4, the base of the sixth triode T6 and the base of the fourth triode T4 in sequence, the collector of the sixth triode T6 is connected with the second end of the second triode T2 and the collector of the second triode T2 respectively, the collector of the sixth triode R6 is connected in series with the twelfth resistor R12 and then is respectively connected with the base of the fourth triode T4, the first end of the fourteenth resistor R14, the first end of the fifteenth resistor R15 and the first end of the sixteenth resistor R16, and the emitter of the second triode T2 is connected in series with the eleventh resistor R11 and the thirteenth resistor R13 in sequence and then is respectively connected with the second end of the fourteenth resistor R14, the second end of the fifteenth resistor R15, the second end of the sixteenth resistor R16, the emitter of the fourth triode T4, the second end of the tenth capacitor C10 and the second end of the twelfth capacitor C12 and then outputs a 28V negative direct 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 a 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 grounded GND, the anode of the first light emitting diode LED1 is connected with the second end of the seventeenth resistor R17, the VIOUT end of the first hall current sensor IC1 is connected with the VOUT1 end of the first detection end J1, the FILTER end of the first hall current sensor IC1 is connected in series with the fourteenth capacitor C14 and then is respectively connected with the GND end of the first detection end J1 and the GND end of the first hall current sensor IC1 and then is grounded GND, the ip+ end of the second hall current sensor IC2 is connected with the emitter of the fourth triode T4, the VCC end of the second hall current sensor IC2 is respectively connected with the first end of the fifteenth capacitor C15, the first end of the eighteenth resistor R18 and the 5V end of the second detection end J2, the second end of the fifteenth capacitor C15 is connected with the cathode of the second light emitting diode LED2 and grounded GND, the anode of the second light emitting diode LED2 is connected with the second end of the eighteenth resistor R18, the VIOUT end of the second hall current sensor IC2 is connected with the VOUT2 end of the second detection end J2, the FILTER end of the second hall current sensor IC2 is connected in series with the sixteenth capacitor C16, and then is respectively 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 grounded GND, 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 primary voltage regulator circuit includes a first voltage regulator U1, a second voltage regulator U2, a third voltage regulator U3, a fourth voltage regulator U4, a fifth voltage regulator U5, a sixth voltage regulator U6, a seventh voltage regulator U7, an eighth voltage regulator U8, a ninth voltage regulator U9, a tenth voltage regulator 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 tenth diode D10, an eleventh diode D11, a twelfth diode D12, a nineteenth capacitor C19, 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 eighth capacitor C28, a twenty-third capacitor C29, a thirty-fourth capacitor C31, a thirty-fourth capacitor C30, the negative pole of the eleventh diode D11 is grounded GND, the positive pole of the eleventh diode D11 is connected with the ADJ end of the first voltage stabilizer U1, the first end of the nineteenth capacitor C19, the ADJ end of the second voltage stabilizer U2, the first end of the twentieth capacitor C20, the ADJ end of the third voltage stabilizer U3, the first end of the twenty-first capacitor C21, the ADJ end of the fourth voltage stabilizer U4, the first end of the twenty-second capacitor C22, the ADJ end of the fifth voltage stabilizer U5 and the first end of the twenty-third capacitor C23, the IN end of the first voltage stabilizer U1 is connected with the IN end of the second voltage stabilizer U2, the IN end of the third voltage stabilizer U3, the IN end of the fourth voltage stabilizer U4 and the first end of the twenty-fourth capacitor C24, the second end of the nineteenth capacitor C19 is respectively connected with the OUT end of the first voltage stabilizer U1 and the positive electrode of the first diode D1, the second end of the twenty third capacitor C20 is respectively connected with the OUT end of the second voltage stabilizer U2 and the positive electrode 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 positive electrode 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 positive electrode 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 positive electrode of the fifth diode D5, the negative electrode of the first diode D1 is respectively connected with the negative electrode of the second diode D2, the negative electrode of the third diode D3, the negative electrode of the fourth diode D4, the negative electrode of the fifth diode D5, the positive electrode of the twenty sixth capacitor C26, the twenty fourth end of the eighth capacitor C28 and the eighth end of the eighth capacitor D24, the second end of the twenty-sixth capacitor C26 is respectively connected with the second end of the twenty-fourth capacitor C24, the first end of the twenty-fifth capacitor C25, the first end of the twenty-seventh capacitor C27, the second end of the twenty-eighth capacitor C28 and the first end of the twenty-ninth capacitor C29, the second end of the twenty-seventh capacitor C27 is respectively connected with the second end of the twenty-ninth capacitor C29, the 24V negative output end, the anode of the sixth diode D6, the anode of the seventh diode D7, the anode of the eighth diode D8, the anode of the ninth diode D9 and the anode of the twelfth diode D10, the cathode of the sixth diode D6 is respectively connected with the OUT end of the sixth voltage regulator U6 and the first end of the thirty-ninth capacitor C30, and the second end of the thirty-seventh capacitor C30 is respectively connected with the ADJ end of the sixth voltage regulator U6, the first end of a thirty-first capacitor C31, the ADJ end of a seventh voltage stabilizer U7, the ADJ end of an eighth voltage stabilizer U8, the first end of a thirty-second capacitor C32, the ADJ end of a ninth voltage stabilizer U9, the first end of a thirty-third capacitor C33, the ADJ end of a tenth voltage stabilizer U10, the first end of a thirty-fourth capacitor C34 and the negative end of a twelfth diode D12 are connected, the positive electrode of the twelfth diode D12 is grounded GND, the second end of the thirty-first capacitor C31 is connected with the negative electrode of the seventh diode D7 and the OUT end of the seventh voltage stabilizer U7, the second end of the thirty-second capacitor C32 is connected with the negative electrode of the eighth diode D8 and the OUT end of the eighth voltage stabilizer U8, the second end of the thirty-third capacitor C33 is connected with the negative electrode of the ninth diode D9 and the negative electrode of the OUT end of the ninth voltage stabilizer U9, the second end of the thirty-fourth capacitor C34 is connected with the negative electrode of the twelfth diode D10 and the positive electrode of the eighth voltage stabilizer U10 and the negative electrode of the eighth voltage stabilizer U28, the output end of the eighth voltage stabilizer IN 28 is connected with the negative electrode of the eighth diode D10 and the eighth voltage stabilizer U10 and the negative electrode of the eighth voltage stabilizer U8, respectively, the second end of the thirty-fourth capacitor C34 is connected with the negative electrode of the eighth voltage stabilizer 10 and the positive electrode of the eighth voltage stabilizer U8, and the positive electrode of the eighth voltage stabilizer 10 and the positive electrode of the V8 is connected with the negative electrode of the eighth voltage stabilizer 8.
The second-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 twenty-eighth diode D20, a twenty-eleventh 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-eighth diode D30, a thirty-eleventh diode D31, a thirty-second diode D32, an eleventh voltage stabilizer U11, a twelfth voltage stabilizer U12, a thirteenth voltage stabilizer U13, a fourteenth voltage stabilizer U14, a fifteenth voltage stabilizer U15, a sixteenth voltage stabilizer U16, a seventeenth voltage stabilizer U17, a eighteenth voltage stabilizer U18, a nineteenth voltage stabilizer U19, a thirty-ninth voltage stabilizer U19, a thirty-eighth capacitor C20, a thirty-eighth capacitor C35, a thirty-fortieth capacitor C35, a thirty-capacitor C46, a fortieth capacitor C35, a thirty-capacitor C35, a fortieth capacitor C35, a thirty-capacitor C46, a fortieth capacitor C46, a thirty-capacitor C46, a fortieth capacitor C35, a capacitor C46, and a fortieth capacitor C33, the negative electrode of the thirteenth diode D13 is connected with the 785-ADJ end, the positive electrode of the thirteenth diode D13 is respectively connected with the first end of the thirty-fifth capacitor C35, the ADJ end of the eleventh voltage stabilizer U11, the first end of the thirty-sixth capacitor C36, the ADJ end of the twelfth voltage stabilizer U12, the first end of the thirty-seventh capacitor C37, the ADJ end of the thirteenth voltage stabilizer U13, the first end of the thirty-eighth capacitor C38, the second end of the thirty-fifth capacitor C35 is respectively connected with the positive electrode of the fifteenth diode D15 and the OUT end of the eleventh voltage stabilizer U11, the second end of the thirty-sixth capacitor C36 is respectively connected with the positive electrode of the sixteenth diode D16 and the OUT end of the twelfth voltage stabilizer U12, the second end of the thirty-seventh capacitor C37 is respectively connected with the positive electrode of the seventeenth diode D17 and the OUT end of the thirteenth voltage stabilizer U13, the second end of the thirty-eighth capacitor C38 is respectively connected with the positive electrode of the eighteenth diode D18 and the OUT end of the fourteenth voltage stabilizer U14, the second end of the thirty-ninth capacitor C39 is respectively connected with the positive electrode of the nineteenth diode D19 and the OUT end of the fifteenth voltage stabilizer U15, the cathode of the fifteenth diode D15 is respectively connected with the cathode of the sixteenth diode D16, the cathode of the seventeenth diode D17, the cathode of the eighteenth diode D18, the cathode of the nineteenth diode D19, the first end of the fortieth capacitor C42, the first end of the fortieth capacitor C44, the anode of the twenty-fifth diode D25, the anode of the twenty-sixth capacitor D26, the anode of the twenty-seventh capacitor C27 and the anode of the twenty-eighth diode D28, the cathode of the twenty-fifth diode D25 is respectively connected with the cathode of the twenty-sixth diode D26, the cathode of the twenty-seventh diode D27, the cathode of the twenty-eighth diode D28 and the third end of the + -15V DC power supply end, the IN end of the eleventh voltage regulator U11 is respectively connected with the IN end of the twelfth voltage regulator U12, the IN end of the thirteenth voltage regulator U13, the end of the fourteenth voltage regulator U14, the IN end of the fifteenth voltage regulator U15, the IN end of the fortieth voltage regulator U40 and the output end of the fortieth capacitor C40V, the second end of the forty capacitor C40 is respectively connected with the first end of the forty-first capacitor C41, the second end of the forty-second capacitor C42, the first end of the forty-third capacitor C43, the second end of the forty-fourth capacitor C44, the first end of the forty-fifth capacitor C45 and the second end of the direct current power supply end of +/-15V and then grounded GND, the second end of the forty-third capacitor C43 is respectively connected with the second end of the forty-fifth capacitor C45, the negative electrode of the twenty-ninth diode D29, the negative electrode of the thirty-second diode D30, the negative electrode of the thirty-second diode D31, the negative electrode of the thirty-second diode D32, the positive electrode of the twenty-second diode D20, the positive electrode of the twenty-second diode D21, the positive electrode of the twenty-third diode D23 and the positive electrode of the twenty-fourth diode D24, the positive electrode of the twenty-ninth diode D29 is respectively connected with the first end of the direct current power supply end of +/-15V, the positive electrode of the thirty-eighth diode D30, the positive electrode of the thirty-second diode D1 and the positive electrode of the thirty-second diode D32, the IN end of the sixteenth voltage stabilizer U16 is connected with the 24V negative electrode output end, the second end of the fortieth capacitor C41 is respectively connected with the IN end of the seventeenth voltage stabilizer U17, the IN end of the eighteenth voltage stabilizer U18, the IN end of the nineteenth voltage stabilizer U19, the IN end of the twentieth voltage stabilizer U20, the first end of the fortieth capacitor C46 is respectively connected with the negative electrode of the twenty-second diode D20 and the OUT end of the sixteenth voltage stabilizer U16, the second end of the fortieth capacitor C46 is respectively connected with the ADJ end of the sixteenth voltage stabilizer U16, the first end of the fortieth capacitor C47, the J end of the seventeenth voltage stabilizer U17, the fortieth capacitor C48, the fortieth capacitor C18 and the fortieth capacitor C18, the ADJ terminal of the nineteenth voltage stabilizer U19, the first terminal of the fifty-sixth capacitor C50, and the ADJ terminal of the twentieth voltage stabilizer U20 are connected, respectively, the second terminal of the forty-sixth capacitor C46 is connected to the negative electrode of the twenty-third diode D20 and the OUT terminal of the sixteenth voltage stabilizer U16, respectively, the second terminal of the forty-seventh capacitor C47 is connected to the negative electrode of the twenty-second diode D21 and the OUT terminal of the seventeenth voltage stabilizer U17, respectively, the second terminal of the forty-eighth capacitor C48 is connected to the negative electrode of the twenty-second diode D22 and the OUT terminal of the eighteenth voltage stabilizer U18, respectively, the second terminal of the fortieth capacitor C49 is connected to the negative electrode of the twenty-third diode D23 and the OUT terminal of the nineteenth voltage stabilizer U19, respectively, and the second terminal of the fifty-fourth capacitor C50 is connected to the negative electrode of the twenty-fourth diode D24 and the OUT terminal of the twentieth voltage stabilizer U20, respectively.
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 supply 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 respectively connected with the first end of the twenty-third resistor R23 and the first end of the twenty-fourth resistor R24, the second end of the twenty-third resistor R23 is respectively connected with the first end of the seventh triode T7, the base of the seventh triode T7 is respectively connected with the second end of the FAN F N26, the first end of the first resistor R27, the twenty-third end of the twenty-third resistor R27 and the twenty-third end of the twenty-third resistor R27.
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 the first end of the nineteenth resistor R19 is respectively connected with the positive electrode of a direct current power supply end of +/-15V and the first input end of the operational amplifier Q1, the control end of the operational amplifier Q1 is respectively connected with an OP-OUT end and the first end of the seventeenth capacitor C17, the second end of the seventeenth capacitor C17 is grounded GND, the second input end of the operational amplifier Q1 is respectively connected with the negative electrode of a direct current power supply end of +/-15V and the first end of the twentieth resistor R20, the second end of the twentieth resistor R20 is respectively connected with the first end of the first sliding rheostat VR1 and the negative electrode output end of the operational amplifier Q1 after being connected in series with the second end of the second sliding rheostat VR2, the second end of the first sliding rheostat VR1 is respectively connected with the second end of the nineteenth resistor C19, and the positive electrode of the operational amplifier Q1 is grounded.
The manual double-gear switching circuit comprises a single-pole double-throw switch S2 and an eighteenth capacitor C18, wherein a first end of the eighteenth capacitor C18 is respectively connected with a first end of the single-pole double-throw switch S2 and a negative electrode of a thirteenth diode D13, a second end of the eighteenth capacitor C18 is respectively connected with a second end of the single-pole double-throw switch S2 and a positive electrode of a fourteenth diode D14, and 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 the primary voltage stabilizing circuit, the automatic-adjustment mode is realized, 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 the operational amplifier, the automatic-adjustment mode is realized.
The working principle of the invention is as follows:
as shown in fig. 1-6, the input stage adopts an R-type transformer T to convert 220v±10%50hz ac voltage into ±28V ac voltage; the + -28V alternating voltage is converted into + -28V direct voltage through a serial linear voltage stabilizer; the back end of the + -28V direct current voltage is provided with an overcurrent protection circuit, and when the current exceeds 0.8A, the overcurrent protection circuit outputs protection; 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-stage voltage stabilizing circuit to output.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (9)
1. The utility model provides a null position testing arrangement based on two fortune is put and hall current sensor, its characterized in that includes 220V/50Hz input voltage end, R type transformer circuit, rectifier circuit, filter circuit, establish ties linear voltage stabilizing circuit, overcurrent protection circuit, current detection circuit, one-level voltage stabilizing circuit, second grade voltage stabilizing circuit, temperature control circuit, null position automatic regulating circuit and manual dual gear switching circuit, 220V/50Hz input voltage end output 220V/50Hz alternating current output + -28V alternating current power supply after the R type transformer circuit is passed through the R type transformer circuit, the R type transformer circuit obtains + -28V direct current voltage after rectifying circuit and filter circuit, obtain + -28V's steady voltage again through establishing ties linear voltage stabilizing circuit, output + -24V's direct current power supply through one-level voltage stabilizing circuit after that, output + -15V's direct current power supply through second grade voltage stabilizing circuit, the temperature control circuit is connected with an input voltage end of 220V/50Hz and used for inhibiting fluctuation of output voltage caused by temperature rise, the overcurrent protection circuit is connected with the series linear voltage stabilizing circuit and used for preventing overcurrent, the current detection circuit is connected with the overcurrent protection circuit and used for detecting voltage, the null automatic regulating circuit and the manual double-gear switching circuit are both connected with the output end of the primary voltage stabilizing circuit and used for regulating symmetry of output positive voltage and negative voltage and keeping mirror image characteristics, when temperature drift occurs to the positive voltage or the negative voltage, the null automatic regulating circuit automatically regulates through a low offset voltage operational amplifier, the null automatic regulating circuit comprises an operational amplifier, a first sliding rheostat, a second sliding rheostat, a seventeenth capacitor, a nineteenth resistor and a twentieth resistor, the first end of the nineteenth resistor is respectively connected with the positive electrode of the direct current power supply end of +/-15V and the first input end of the operational amplifier, the control end of the operational amplifier is respectively connected with the OP-OUT end and the first end of the seventeenth capacitor, the second end of the seventeenth capacitor is grounded, the second input end of the operational amplifier is respectively connected with the negative electrode of the direct current power supply end of +/-15V and the first end of the twentieth resistor, the second end of the twentieth resistor is connected with the first end of the first sliding rheostat and the negative electrode output end of the operational amplifier after being connected with the second sliding rheostat in series, the second end of the first sliding rheostat is connected with the second end of the nineteenth resistor, and the positive electrode 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 respectively connected with the first end of the single-pole double-throw switch and the negative electrode of a thirteenth diode, the second end of the eighteenth capacitor is respectively connected with the second end of the single-pole double-throw switch and the positive electrode of a fourteenth diode, and the automatic regulation mode is realized when the two control ends of the single-pole double-throw switch are respectively connected with the first control end and the first control end of the primary voltage stabilizing circuit, and the manual regulation mode is realized when the two control ends of the single-pole double-throw switch are respectively connected with the output end and the ground end of the operational amplifier.
2. The device for testing the null position based on the double operational amplifier and the Hall current sensor according to claim 1, wherein the R-type transformer circuit comprises an R-type transformer, a main power switch and a fuse, wherein a live wire of a 220V/50Hz input voltage end is connected with a first input end of the R-type transformer after being connected with the main power switch in series, and a zero wire of the 220V/50Hz input voltage end is connected with a second input end of the R-type transformer after being connected with the fuse in series.
3. A null test device based on a dual op-amp and Hall current sensor as claimed in claim 2, wherein,
The rectifying circuit comprises a rectifier, a first input end of the rectifier is connected with an anode output end of the R-type transformer, and a second input end of the rectifier is connected with a cathode 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. A zero test device based on a dual op-amp and hall current sensor according to claim 3, wherein 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, the positive electrode of the first diode is connected to the negative electrode of the second diode, the ground terminal of the R-type transformer, the first terminal of the seventh capacitor, the first terminal of the eighth capacitor, the first terminal of the ninth capacitor, the first terminal of the tenth capacitor, the first terminal of the eleventh capacitor and the first terminal of the twelfth capacitor, respectively, the negative electrode of the first diode is connected to the first terminal of the first resistor and the first terminal of the third resistor, the second terminal of the first resistor is connected to the first terminal of the fifth capacitor, the positive electrode of the second diode is connected to the first terminal of the second resistor and the first terminal of the fourth resistor, respectively, and the second terminal of the second resistor is connected to the second terminal of the sixth resistor.
5. The device for zero test based on a dual op-amp and hall current sensor according to claim 4, wherein the overcurrent protection circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, 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 the base of the first transistor is connected to the second end of the third transistor, the second end of the third resistor and the base of the fifth transistor, the collector of the fifth transistor is connected to the collector of the first transistor and the second end of the first resistor, the emitter of the fifth transistor is connected to the first end of the seventh resistor, the eleventh resistor, the fourth end of the ninth resistor and the third resistor, the base of the third transistor is connected to the third end of the fourth resistor, the base of the third transistor is connected to the fourth end of the fourth resistor, the base of the fourth transistor is connected to the third end of the fourth resistor, the base of the fourth transistor is connected to the fourth resistor, the base of the fourth resistor is connected to the fourth end of the fourth resistor, the collector of the sixth triode is connected with the base of the fourth triode, the first end of the fourteenth resistor, the first end of the fifteenth resistor and the first end of the sixteenth resistor in series, and the emitter of the second triode is 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 in series in sequence.
6. The device according to 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 fifteenth capacitor and a sixteenth capacitor, the ip+ terminal of the first hall current sensor is connected to the emitter of a third triode, 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 the ground, 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 VOUT1 terminal of the first detection terminal, the FILTER terminal of the first hall current sensor is connected to the first hall current sensor, the ip+ terminal of the second hall current sensor is connected to the anode of the fifth terminal of the second hall current sensor, the anode of the fifth hall current sensor is connected to the anode of the fifth light emitting diode, the cathode of the second hall current sensor is connected to the cathode of the fifth light emitting diode, the fifth terminal of the first hall current sensor is connected to the anode of the fifth hall current sensor is connected to the cathode of the fifth terminal of the fifth light emitting diode, the fifth hall current sensor is connected to the cathode of the fifth terminal of the fifth hall current sensor is connected to the fifth terminal of the fifth hall current sensor is connected, and the fifth terminal of the fifth terminal is connected to the fifth terminal of the fifth capacitor, and the fifth terminal of the fifth capacitor is connected to the fifth terminal of the fifth capacitor is respectively, and the fifth terminal is connected to the fifth terminal is respectively. And the FILTER end of the second Hall current sensor is connected with the GND end of the second detection end and the GND end of the second Hall current sensor in series and then grounded.
7. The device 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 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-first 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 positive electrode of the first diode, the second end of the twentieth 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 positive electrode 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 positive electrode 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 positive electrode of the fifth diode, the negative electrode of the first diode is respectively connected with the negative electrode of the second diode, the negative electrode of the third diode, the negative electrode of the fourth diode, the negative electrode of the fifth diode, the first end of the twenty sixth capacitor, the first end of the twenty eighth capacitor and the 24V positive electrode 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 electrode output end, the positive electrode of the sixth diode, the positive electrode of the seventh diode, the positive electrode of the eighth diode, the positive electrode of the ninth diode and the positive electrode of the twelfth diode, the negative electrode of the sixth diode is respectively connected with the OUT end of the sixth voltage stabilizer and the first end of the thirty-eighth capacitor, the second end of the thirty-seventh 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 ADJ end of the eighth voltage stabilizer, the first end of the thirty-second capacitor, the positive electrode of the twelfth diode is grounded, the second end of the thirty-first capacitor is respectively connected with the negative electrode of the seventh diode and the OUT end of the seventh voltage stabilizer, the second end of the thirty-second capacitor is respectively connected with the negative electrode of the eighth diode and the OUT end of the eighth voltage stabilizer, the second end of the thirty-third capacitor is respectively connected with the negative electrode of the ninth diode and the OUT end of the ninth voltage stabilizer, the second end of the thirty-fourth capacitor is respectively connected with the negative electrode of the twelfth diode and the OUT end of the tenth voltage stabilizer, the IN end of the fifth voltage stabilizer is connected with the 28V positive electrode output end, the IN end of the sixth voltage stabilizer is connected with the 28V negative electrode output end, and the second end of the twenty-fifth capacitor is respectively connected with the IN end of the seventh voltage stabilizer, the IN end of the eighth voltage stabilizer and the IN end of the ninth voltage stabilizer.
8. The dual op-amp and hall current sensor based null test device of claim 7, wherein said second stage 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 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-second diode, a thirty-eighth 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 twenty-fifth voltage regulator, a thirty-fifth capacitor, a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-ninth capacitor, a fortieth capacitor and a fortieth capacitor, the cathode of the thirteenth diode is connected with the 785-ADJ end, and 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, A first end of a thirty-fifth capacitor and an ADJ end of a fifteenth voltage stabilizer, wherein the second end of the thirty-fifth capacitor is respectively connected with an anode of a fifteenth diode and an OUT end of the eleventh voltage stabilizer, the second end of the thirty-sixth capacitor is respectively connected with an anode of a sixteenth diode and an OUT end of the twelfth voltage stabilizer, the second end of the thirty-seventh capacitor is respectively connected with the anode of the seventeenth diode and the OUT end of the thirteenth voltage stabilizer, the second end of the thirty-eighth capacitor is respectively connected with an anode of the eighteenth diode and the OUT end of the fourteenth voltage stabilizer, the second end of the thirty-eighth capacitor is respectively connected with an anode of the nineteenth diode and an OUT end of the fifteenth voltage stabilizer, the cathode of the fifteenth diode is respectively connected with an anode of the sixteenth diode, an anode of the seventeenth diode, an anode of the eighteenth diode, an anode of the ninth diode, an anode of the nineteenth diode, a cathode of the fortieth capacitor, a first end of the fortieth capacitor, a second end of the fortieth capacitor, a fourth end of the fortieth capacitor, a fortieth diode, a twenty-fourth end of the twenty-fifth diode, a positive electrode of the fortieth diode, a fortieth voltage stabilizer, a fortieth end of the fortieth capacitor, a fortieth end of the fortieth diode, and a voltage stabilizer are respectively connected with an anode of the twenty-eighth diode, a fortieth diode, and a fortieth end of the twenty-eighth diode, and an anode of the twenty-eighth voltage stabilizer, and a voltage stabilizer are respectively, and the twenty-eighth end of the twenty-eighth voltage stabilizer are respectively connected with the anode of the twenty-eighth diode, and the twenty-eighth end of the twenty-eighth voltage stabilizer, and the twenty-eighth voltage stabilizer are respectively 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 end are respectively connected with the second end of the forty-fifth capacitor, the cathode of the twenty-ninth diode, the cathode of the thirty-eighth diode, the cathode of the thirty-second diode, the anode of the twenty-eighth diode, the anode of the twenty-third diode and the anode of the twenty-fourth diode, the anode of the twenty-ninth diode is respectively connected with the first end of the + -15V direct current power supply end, the anode of the thirty-eighth diode and the anode of the thirty-eighth diode, the IN end of the sixteenth voltage stabilizer is connected with the 24V cathode output end, the second end of the forty-sixth 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 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-second 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, the second end of the forty-ninth capacitor is respectively connected with the cathode of the twenty-third diode and the OUT end of the nineteenth voltage stabilizer, and the second end of the fifty-fourth capacitor is respectively connected with the cathode of the twenty-fourth diode and the OUT end of the twenty-eighth voltage stabilizer.
9. The device of 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, the first end of the twenty-first resistor being connected to the 12V power supply output and the first end of the twenty-second resistor, respectively, the second end of the twenty-first resistor being connected to the second end of the twenty-second resistor, the first end of the fan, and the first end of the temperature sensor, the second end of the temperature sensor being connected to the first end of the twenty-third resistor, and the first end of the twenty-fourth resistor, respectively, the second end of the twenty-third resistor being connected to the base of the seventh triode, the first end of the seventh triode being connected to the second end of the fan, the fifth end of the twenty-fifth resistor, the first end of the twenty-sixth resistor, and the twenty-third end of the twenty-seventh resistor, and the twenty-third resistor, respectively, the twenty-third end of the twenty-third resistor, and the twenty-third resistor, respectively.
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0739072A (en) * | 1993-07-21 | 1995-02-07 | Sharp Corp | Power supply circuit |
| CN1122970A (en) * | 1995-07-07 | 1996-05-22 | 沙占起 | Power amplifier circuit |
| JP2000357017A (en) * | 1999-06-16 | 2000-12-26 | Toray Eng Co Ltd | Slide type automatic voltage regulator |
| CN101718812A (en) * | 2009-12-11 | 2010-06-02 | 力柏时代锂动力科技（北京）有限公司 | Measurement circuit of direct current |
| CN102141816A (en) * | 2010-10-19 | 2011-08-03 | 启攀微电子（上海）有限公司 | Current-mode current induction circuit externally connected with MOS (metal oxide semiconductor) and method for realizing current mode |
| CN103125067A (en) * | 2010-09-10 | 2013-05-29 | 意法爱立信有限公司 | Symmetrical output switch-mode power supply |
| CN203824695U (en) * | 2014-03-26 | 2014-09-10 | 南京信息工程大学 | Apparatus for inhibiting sensitivity thermal drift and noise of silicon nanowire giant piezoresistive sensor |
| CN104079071A (en) * | 2014-07-10 | 2014-10-01 | 国家电网公司 | Power line carrier power utilization parameter receiving control device and method |
| CN109660109A (en) * | 2018-12-04 | 2019-04-19 | 深圳芯智汇科技有限公司 | A kind of adaptive zero cross detection circuit suitable for Switching Power Supply |
| CN109798951A (en) * | 2017-11-17 | 2019-05-24 | 厦门雅迅网络股份有限公司 | A kind of vehicle-mounted oil level detection from circuit for rectifying and method |
| CN110544946A (en) * | 2019-09-27 | 2019-12-06 | 国网山东省电力公司济南市历城区供电公司 | Constant voltage power supply remote end power supply compensating system |
| CN111751618A (en) * | 2020-07-07 | 2020-10-09 | 广东省计量科学研究院（华南国家计量测试中心） | Voltage and current phase measurement calibration equipment |
| CN112162582A (en) * | 2020-09-10 | 2021-01-01 | 中山大学 | Voltage source circuit based on operational amplifier bootstrap and feedback circuit |
| CN214412603U (en) * | 2021-02-02 | 2021-10-15 | 江西农业大学南昌商学院 | Synchronous adjustable positive and negative symmetrical mirror image tracking voltage-stabilized power supply |
| CN114567198A (en) * | 2022-02-22 | 2022-05-31 | 陕西省电子技术研究所有限公司 | Single-phase pure sine inverter power supply based on D-type power amplifier |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9871442B2 (en) * | 2015-05-21 | 2018-01-16 | Pacific Power Source, Inc. | Zero-offset voltage feedback for AC power supplies |
| CN105092928B (en) * | 2015-07-23 | 2018-04-20 | 深圳市华谊智测科技股份有限公司 | Digital split-core type meter and its method for automatic measurement |
-
2022
- 2022-09-23 CN CN202211166535.7A patent/CN115436689B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0739072A (en) * | 1993-07-21 | 1995-02-07 | Sharp Corp | Power supply circuit |
| CN1122970A (en) * | 1995-07-07 | 1996-05-22 | 沙占起 | Power amplifier circuit |
| JP2000357017A (en) * | 1999-06-16 | 2000-12-26 | Toray Eng Co Ltd | Slide type automatic voltage regulator |
| CN101718812A (en) * | 2009-12-11 | 2010-06-02 | 力柏时代锂动力科技（北京）有限公司 | Measurement circuit of direct current |
| CN103125067A (en) * | 2010-09-10 | 2013-05-29 | 意法爱立信有限公司 | Symmetrical output switch-mode power supply |
| CN102141816A (en) * | 2010-10-19 | 2011-08-03 | 启攀微电子（上海）有限公司 | Current-mode current induction circuit externally connected with MOS (metal oxide semiconductor) and method for realizing current mode |
| CN203824695U (en) * | 2014-03-26 | 2014-09-10 | 南京信息工程大学 | Apparatus for inhibiting sensitivity thermal drift and noise of silicon nanowire giant piezoresistive sensor |
| CN104079071A (en) * | 2014-07-10 | 2014-10-01 | 国家电网公司 | Power line carrier power utilization parameter receiving control device and method |
| CN109798951A (en) * | 2017-11-17 | 2019-05-24 | 厦门雅迅网络股份有限公司 | A kind of vehicle-mounted oil level detection from circuit for rectifying and method |
| CN109660109A (en) * | 2018-12-04 | 2019-04-19 | 深圳芯智汇科技有限公司 | A kind of adaptive zero cross detection circuit suitable for Switching Power Supply |
| CN110544946A (en) * | 2019-09-27 | 2019-12-06 | 国网山东省电力公司济南市历城区供电公司 | Constant voltage power supply remote end power supply compensating system |
| CN111751618A (en) * | 2020-07-07 | 2020-10-09 | 广东省计量科学研究院（华南国家计量测试中心） | Voltage and current phase measurement calibration equipment |
| CN112162582A (en) * | 2020-09-10 | 2021-01-01 | 中山大学 | Voltage source circuit based on operational amplifier bootstrap and feedback circuit |
| CN214412603U (en) * | 2021-02-02 | 2021-10-15 | 江西农业大学南昌商学院 | Synchronous adjustable positive and negative symmetrical mirror image tracking voltage-stabilized power supply |
| CN114567198A (en) * | 2022-02-22 | 2022-05-31 | 陕西省电子技术研究所有限公司 | Single-phase pure sine inverter power supply based on D-type power amplifier |
Non-Patent Citations (1)
| Title |
|---|
| 高精度 高对称度正负电源的研究;闫艳,等;《河北煤炭》(第5期);全文 * |
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