DC electronic load debugging system
By introducing overcurrent protectors and diode protection devices into the DC electronic load debugging system, combined with precision resistors and current clamp measurements, the problems of low current accuracy and safety hazards were solved, achieving high-precision and safe debugging results.
Patent Information
- Application Number
- CN202520452712.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-15
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-15
AI Technical Summary
Existing DC electronic load debugging systems have low current accuracy at low constant current ranges. After calibration, the displayed value differs greatly from the actual value, and there are safety hazards, such as excessive loop current when the current is switched improperly, and a lack of protection.
Overcurrent protectors and diode protection devices are used, combined with precision resistors and current clamp measurements to ensure the accuracy and safety of current values; when the power supply and load are reversed, the diode cut-off circuit prevents malfunction; and when calibrating at low ranges, precision resistor sampling is used to improve the accuracy of current values.
It improves the measurement accuracy and safety of the debugging system, prevents excessive loop current, ensures personal safety, reduces the frequency of return-to-factory calibration, and improves production efficiency and product qualification rate.
Smart Images
Figure CN223955709U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of instrument and meter test technology, concretely to a DC electronic load debugging system. BACKGROUND
[0002] In the debugging process of the DC electronic load, it is found that the current precision of the electronic load is low when the constant current low range is used, and the difference between the display value and the actual value is too large when the factory metering is carried out after the debugging and calibration are completed, so the product needs to be returned to the factory for recalibration, which affects the production efficiency and the product qualification rate; and during the switching process from the high range calibration to the low range after the high range calibration of the current is completed, the electronic load is often switched to the constant current low range due to human negligence, and the DC power supply output current setting is still in the high range, once the operation is wrong, the loop current is too large, the debugging system lacks protection, and there is a certain safety hazard.
[0003] It is found that the traditional debugging system uses the current clamp when measuring the loop current, and the disadvantages of the system are: low precision, large zero point offset, unstable display when using the low current range, and inaccurate reading when calibrating the electronic load with the input current value. UTILITY MODEL CONTENTS
[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a DC electronic load debugging system, which can effectively solve the problems in the background art.
[0005] In order to achieve the above-mentioned purpose, the utility model discloses a DC electronic load debugging system, which adopts the technical scheme that a power supply is connected with a protection device, a measuring device and an electronic load, and then the power supply is connected back; the protection device includes a switch connected with an overcurrent protector and a diode; the measuring device includes a current clamp connected with a precision resistor; the precision resistor and the electronic load are both connected with a voltage detector. The overcurrent protector can be turned off in time when the loop current is too large due to the wrong operation, so as to protect the debugging system.
[0006] As a preferred technical scheme of the utility model, the precision resistor is a 0.1 mΩ / 1000 W precision resistor. The precision resistor can sample the current and obtain a high-precision and stable current value for detection.
[0007] As a preferred technical scheme of the utility model, the voltage detector is a multimeter or a voltmeter.
[0008] As a preferred technical scheme of the utility model, the voltage detector includes a first multimeter and a second multimeter, the first multimeter is connected across the precision resistor, and the second multimeter is connected across the electronic load.
[0009] As a preferred technical scheme of the utility model, the power supply is a direct current power supply, the electronic load is a direct current electronic load, when the direct current power supply and the direct current electronic load are reversely connected, the diode can be reversely cut off, the circuit does not work, and the personal safety and the safety of the debugging system are ensured.
[0010] Compared with the prior art, the utility model has the beneficial effects that: the utility model is provided with the overcurrent protector and the diode, can cut off the circuit in time when the backflow current is too large, protects the debugging system, when the direct current power supply and the direct current electronic load are reversely connected, the diode can cut off the circuit, makes the circuit not work, ensures the personal safety and the safety of the debugging system, the overcurrent protector and the diode are used in combination, can improve the safety of the whole detection system, when the measuring device is in the high range of the calibration current, directly measures through the current clamp, convenient operation, when the measuring device is in the low range of the calibration current, adopts the precision resistance to take the sample of the current, can bring the current value with high precision and good stability, thereby improving the measurement precision of the debugging system. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the structural schematic diagram of the utility model.
[0012] In the drawing: 1, power supply;2, switch;3, overcurrent protector;4, diode;5, current clamp;6, precision resistance;7, electronic load;8, first multimeter;9, second multimeter;10, protection device;11, measuring device. DETAILED DESCRIPTION
[0013] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model. EMBODIMENT
[0014] As Figure 1 Indicated, the utility model discloses a kind of direct current electronic load debugging system, the technical scheme used is, including direct current type power supply 1, the positive pole of power supply 1 is connected with the switch 2 of protection device 10, switch 2 rear end connects overcurrent protector 3, for abnormal situation of coping with current too large, overcurrent protector 3 rear end connects diode 4, for abnormal situation of coping with power supply 1 and electronic load 7 reverse connection.
[0015] The current clamp 5 of the back end connection measuring device 11 is connected with the diode 4, and the current clamp 5 is used for measuring the current value in the circuit, the back end of the current clamp 5 is connected with the precision resistance 6 of 0.1 mΩ / 1000 W, the back end of the precision resistance 6 is connected with the electronic load 7, and the back end of the electronic load 7 is connected with the negative pole of the power supply 1.
[0016] In order to obtain the voltage value between the precision resistance 6 and the electronic load 7, the first multimeter 8 is connected in parallel between the precision resistance 6, and the second multimeter 9 is connected in parallel between the electronic load 7, and the first multimeter 8 and the second multimeter 9 are both Agilent 34461 type desktop digital multimeters.
[0017] The working principle of the utility model is: when the debugging system is used, the switch 2 is opened, the power supply 1 outputs direct current voltage, the current is added to the two ends of the electronic load 7 after passing through the protection device 10 and the precision resistance 6. When the operator misoperation leads to the loop current exceeding the predetermined value, the overcurrent protector 3 is turned off, and the whole debugging system stops working;When the positive and negative poles of the power supply 1 and the electronic load 7 are reversely connected, the diode 4 is reversely cut off, the circuit does not work, and the personal safety of the debugging personnel and the safety of the debugging system are ensured;When the high range of the calibration current is calibrated, the power supply 1 outputs large current, the value of the current clamp 5 is read as the current value input, when the low range of the calibration current is calibrated, the power supply 1 outputs small current, small current flows through the precision resistance 6, the first multimeter 8 measures the voltage between the two ends of the precision resistance 6, and the obtained voltage value is divided by 0.1 mΩ as the loop current I, the debugging personnel read the voltage of the second multimeter 9 as the input voltage V1 of the electronic load 7, and the input voltage V1 of the electronic load 7 and the loop current I are input into the electronic load 7 for voltage and current calibration.
[0018] The circuit connection related to the utility model is a common means adopted by the person skilled in the art, and can be obtained through limited tests, and belongs to the public knowledge.
[0019] The components not described in detail in the text are prior art.
[0020] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A DC electronic load commissioning system, characterized by: The power supply (1) is connected with the protection device (10), the measuring device (11) and the electronic load (7), and then the power supply (1) is connected back; the protection device (10) comprises a switch (2) connected with an overcurrent protector (3) and a diode (4); the measuring device (11) comprises a current clamp (5) connected with a precision resistor (6); the precision resistor (6) and the electronic load (7) are both connected with a voltage detector.
2. The DC electronic load commissioning system of claim 1, wherein: The precision resistor (6) is a 0.1 mΩ / 1000 W precision resistor.
3. The DC electronic load commissioning system of claim 1, wherein: The voltage detector is a multimeter or a voltmeter.
4. The DC electronic load commissioning system of claim 3, wherein: The voltage detector comprises a first multimeter (8) and a second multimeter (9), the first multimeter (8) is connected at both ends of the precision resistor (6), and the second multimeter (9) is connected at both ends of the electronic load (7).
5. The DC electronic load commissioning system of claim 1, wherein: The power supply (1) is a direct current power supply, and the electronic load (7) is a direct current electronic load.