CN219266388U - DC tool on-line current testing device - Google Patents
DC tool on-line current testing device Download PDFInfo
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- CN219266388U CN219266388U CN202223318299.4U CN202223318299U CN219266388U CN 219266388 U CN219266388 U CN 219266388U CN 202223318299 U CN202223318299 U CN 202223318299U CN 219266388 U CN219266388 U CN 219266388U
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- 238000012360 testing method Methods 0.000 title claims abstract description 110
- 238000005070 sampling Methods 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 230000003068 static effect Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses an on-line current testing device for a direct current tool, which comprises a direct current testing power supply, a power supply conversion circuit, a first current testing circuit, a second current testing circuit, a battery connector, a first current sampling circuit, a second current sampling circuit and a control circuit, wherein the first current testing circuit, the second current testing circuit and the battery connector are all electrically connected with the direct current testing power supply, the first current sampling circuit, the second current sampling circuit and the control circuit are all electrically connected with the control circuit and are respectively and electrically connected with the first current testing circuit and the second current testing circuit, and the control circuit is suitable for controlling the battery connector to be respectively and electrically connected with the first current testing circuit or the second current testing circuit. The utility model realizes the automatic switching of the current tests with different measuring ranges, accurately and rapidly measures the static current and the running current of the direct current tool, has convenient use and low manufacturing cost, and effectively reduces the errors of the test links.
Description
Technical Field
The utility model relates to the technical field of current testing, in particular to a current device for online testing of a direct current tool.
Background
The direct current tool is powered by a rechargeable battery, can be used in any place under any general environment, is safe and reliable, and is widely used. Common dc tools such as electric screwdrivers, electric drills, circular saws, flashlights, nailers, sanders, etc. require measurement at the factory. Because the static current requirement of the direct current tool is less than a few microamps, the running current is from a few amperes to tens of amperes, the range span is overlarge, two ampere meters with different ranges are needed to be used during measurement so as to ensure accurate and safe measured current data, the operation is troublesome, and the ampere meter is often selected incorrectly due to carelessness of a detector during actual measurement, so that the microampere meter is damaged in measuring the running current or the static current cannot be measured by the large-range ampere meter.
Disclosure of Invention
The utility model aims to provide an on-line current testing device for a direct current tool, which aims at overcoming the defects of the prior art, realizes automatic switching of current testing of different measuring ranges, and accurately and rapidly measures the static current and the running current of the direct current tool.
The technical scheme for realizing the purpose of the utility model is as follows:
the utility model provides a direct current instrument on-line test current device, includes direct current test power, power conversion circuit, all with the first current test circuit, second current test circuit and the battery connector that direct current test power electricity is connected and all with the first current sampling circuit, second current sampling circuit and the control circuit of power conversion circuit electricity is connected, first current sampling circuit and second current sampling circuit all are connected with the control circuit electricity and are connected with first current test circuit and second current test circuit electricity respectively, control circuit is suitable for controlling the battery connector and is connected with first current test circuit or second current test circuit electricity respectively.
Further, the control circuit comprises a relay J1 and a driving circuit electrically connected with the relay J1, the battery connector is electrically connected with the movable contact of the relay J1, and the first current testing circuit and the second current testing circuit are respectively electrically connected with the normally closed static contact and the normally open static contact of the relay J1.
Further, the control circuit further comprises an indicator light circuit, the indicator light circuit comprises an engaging indicator light LED1, an opening indicator light LED2, a resistor R9 and a triode T2, the engaging indicator light LED1 and the relay J1 are arranged in parallel, one end of the resistor R9 is connected with the opening indicator light LED2, the other end of the resistor R9 is connected with the b pole of the triode T2, and the c pole and the e pole of the triode T2 are respectively connected with the other end of the opening indicator light LED2 and the ground.
Further, the control circuit further includes a diode D5 provided in parallel with the relay.
Further, the driving circuit comprises a triode T1, a diode D3, a diode D4, a resistor R7, a resistor R8 and a capacitor C3, wherein the resistor R7, the resistor R8 and the capacitor C3 are connected with the cathodes of the diode D3 and the diode D4, the other end of the resistor R7 is connected with the pole b of the triode T1, the pole C of the triode T1 is connected with a relay J1, and the pole e, the resistor R8 and the other end of the capacitor C3 are grounded.
Further, the first current sampling circuit includes a resistor R3, a resistor R4, a capacitor C2 and an operational amplifier IC1, one ends of the resistor R3 and the resistor R4 are connected to the inverting input end of the operational amplifier IC1, the other ends are respectively connected to the positive electrode and the negative electrode of the output end of the power conversion circuit, the non-inverting input end of the operational amplifier IC1 is simultaneously connected to the capacitor C2 and the first current sampling circuit, and the output end is connected to the control circuit.
Further, the second current sampling circuit comprises a resistor R5, a resistor R6 and an operational amplifier IC2, one ends of the resistor R5 and the resistor R6 are connected with the inverting input end of the operational amplifier IC2, the other ends are respectively connected with the positive electrode and the negative electrode of the output end of the power conversion circuit, the non-inverting input end of the operational amplifier IC2 is connected with the second current sampling circuit, and the output end of the operational amplifier IC2 is connected with the control circuit.
Further, the first current test circuit comprises a resistor R1, a microammeter with the measuring range of 0-200 uA, a capacitor C1, a diode D1 and a diode D2, wherein the microammeter, the capacitor C1, the diode D1 and the diode D2 are arranged in parallel, the cathode of the diode D1 and the anode of the diode D2 are grounded, the anode of the diode D1 and the cathode of the diode D2 are connected with the resistor R1, and the other end of the resistor R1 is connected with the control circuit.
Further, the second current testing circuit comprises a shunt resistor R2 (200A/75 mV) and an ammeter (200A/75 mV) with the measuring range of 0-200A, which are arranged in parallel, one end of the ammeter is grounded, and the other end of the ammeter is connected with the control circuit.
Further, the negative electrode of the direct current test power supply is connected with the negative electrode of the power supply conversion circuit.
Further, the voltage testing circuit comprises a direct current voltmeter, wherein the positive electrode and the negative electrode of the direct current voltmeter are respectively connected with the positive electrode and the negative electrode of the direct current testing power supply.
By adopting the technical scheme, the utility model has the following beneficial effects:
(1) According to the utility model, the mains supply is converted into the power supply which can be used by the circuit through the power supply conversion circuit, the tested direct current tool is connected through the battery connector, the first current sampling circuit and the second current sampling circuit are used for collecting the current of the tested direct current tool and feeding the current back to the control circuit, the battery connector is controlled by the control circuit to be respectively electrically connected with the first current testing circuit or the second current testing circuit, so that the tested direct current tool is tested by the first current testing circuit or the second current testing circuit which is suitable for the current range of the tested direct current tool, the automatic switching of two different current testing ranges is realized, the use is convenient, the manufacturing cost is low, and the error of a testing link is effectively reduced.
(2) The control circuit drives the relay J1 to be attracted and disconnected through the driving circuit, so that the battery connector is connected with the first current testing circuit and the second current testing circuit respectively, and the control circuit is simple in circuit structure and convenient to control.
(3) According to the utility model, the indicator lamp circuit is arranged, so that the relay J1 can be intuitively displayed to be on or off, and the current value of the direct current tool is reflected to be positioned between the first current test circuit and the second current test circuit or between the measuring ranges of the first current test circuit and the second current test circuit, so that the quick identification of a tester is facilitated.
(4) According to the utility model, the diode D5 is connected in parallel to the relay J1 as the back-pressure preventing diode, so that the back-pressure breakdown of the triode T1 generated by the coil of the relay J1 is avoided.
(5) The driving circuit of the utility model forms an AND gate through the diode D3 and the diode D4, controls the triode T1 to work, realizes the control of the action of the relay J1, completes the work of two current testing circuits with different measuring ranges, and has simple circuit structure; the anti-interference and hold-down circuit is formed by R7, R8 and C3, so that the working stability of the driving circuit is further improved.
(6) According to the utility model, the first current sampling circuit and the second current sampling circuit respectively divide the voltage through the resistor to provide reference voltages for the corresponding operational amplifiers, and the operational amplifiers compare the reference voltages and transmit the result to the driving circuit, so that the circuit structure is simple.
(7) According to the utility model, the first current test circuit and the second current test circuit are respectively provided with the microammeter with the diameter of 0-200 uA and the ammeter with the diameter of 0-200A, so that the test requirements of the static current and the transfer current of the direct current tool are met.
(8) The utility model is also provided with a voltage test circuit, can realize voltage test while carrying out current test on the direct current tool, and is more convenient to use.
Drawings
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings, in which:
fig. 1 is a schematic circuit diagram of the present utility model.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
The on-line current testing device for the direct current tool shown in fig. 1 comprises a direct current testing power supply, a power supply conversion circuit, a first current testing circuit, a second current testing circuit, a battery connector, a first current sampling circuit, a second current sampling circuit and a control circuit, wherein the first current testing circuit, the second current testing circuit and the battery connector are all electrically connected with the direct current testing power supply, the first current sampling circuit, the second current sampling circuit and the control circuit are all electrically connected with the power supply conversion circuit, the mains supply is converted into a power supply which can be used by the circuit through the power supply conversion circuit, the tested direct current tool is connected through the battery connector, the voltage testing circuit is further connected to the battery connector, and the voltage testing can be realized when the direct current tool is subjected to current testing, so that the use is more convenient. Meanwhile, the first current sampling circuit and the second current sampling circuit are electrically connected with the control circuit and are respectively electrically connected with the first current testing circuit and the second current testing circuit, the first current sampling circuit and the second current sampling circuit are used for collecting the current of the tested direct current tool and feeding the current back to the control circuit, and the control circuit is used for controlling the battery connector to be respectively electrically connected with the first current testing circuit or the second current testing circuit, so that the first current testing circuit or the second current testing circuit which is suitable for the current range of the tested direct current tool can test the tested direct current tool, and automatic switching of two different current testing ranges is realized.
The power conversion circuit comprises a switch K1 and a power adapter which are electrically connected, the switch K1 controls the power adapter to be turned on and off, and the mains supply is converted into a DC12V working power supply through the power adapter. The first current test circuit comprises a resistor R1, a microammeter with the measuring range of 0-200 uA, a capacitor C1, a diode D1 and a diode D2. The second current testing circuit comprises a resistor R2 and an ammeter with the measuring range of 0-200A. The first current sampling circuit includes a resistor R3, a resistor R4, a capacitor C2, and an operational amplifier IC1. The second current sampling circuit includes a resistor R5, a resistor R6, and an operational amplifier IC2. The voltage test circuit comprises a direct current voltmeter. The control circuit comprises a relay J1, a driving circuit composed of a triode T1, a diode D3, a diode D4, a resistor R7, a resistor R8 and a capacitor C3, and an indicator light circuit composed of a diode D5, an attracting indicator light LED1, a disconnection indicator light LED2, a resistor R9 and a triode T2.
Specifically, the power adapter and the negative electrode of the direct current test power supply are grounded, the resistor R1 is connected with a microammeter with the measuring range of 0-200 uA in parallel, the negative electrode of the microammeter, the negative electrode of the diode D1 and the positive electrode of the diode D2 are grounded, the positive electrode of the microammeter, the positive electrode of the diode D1 and the negative electrode of the diode D2 are connected with the resistor R1, and the other end of the resistor R1 is connected with a normally closed static contact of the relay J1. The resistor R2 and the ammeter with the measuring range of 0-200A are arranged in parallel, the negative electrode of the ammeter is grounded, and the positive electrode of the ammeter is connected with the normally open static contact of the relay J1. The positive pole and the negative pole of the direct current voltmeter are respectively connected with the positive pole and the negative pole of the direct current test power supply.
One end of the resistor R3 and one end of the resistor R4 are connected with the inverting input end of the operational amplifier IC1, the other end of the resistor R4 is respectively connected with the positive electrode and the negative electrode of the output end of the power adapter, the non-inverting input end of the operational amplifier IC1 is simultaneously connected with the other ends of the capacitor C2 and the resistor R1, and the output end of the resistor R4 is connected with the positive electrode of the diode D3. One end of the resistor R5 and one end of the resistor R6 are connected with the inverting input end of the operational amplifier IC2, the other end of the resistor R6 is respectively connected with the positive electrode and the negative electrode of the output end of the power adapter, the non-inverting input end of the operational amplifier IC2 is connected with the positive electrode of the ammeter, and the output end of the operational amplifier IC2 is connected with the diode D4. The negative poles of the diode D3 and the diode D4 are simultaneously connected with the resistor R7, the resistor R8 and the capacitor C3, the other end of the resistor R7 is connected with the b pole of the triode T1, the C pole of the triode T1 is connected with the relay J1, and the e pole is grounded with the other ends of the resistor R8 and the capacitor C3. The other end of the relay J1, the negative electrode of the diode D5, the attraction indicating lamp LED1 and one end of the disconnection indicating lamp LED2 are connected with the positive electrode of the output end of the power adapter, the positive electrode of the diode D5 and the other end of the attraction indicating lamp LED1 are connected with the c electrode of the triode T1, one end of the resistor R9 is connected with the c electrode of the triode T1, the other end is connected with the b electrode of the triode T2, and the e electrode of the triode T2 is grounded.
The capacitor C1, the diode D2 and the resistor R1 form a protection circuit of the microammeter, the resistor R2 is a current divider of the ammeter, the resistor R3 and the resistor R4 divide the voltage of the operational amplifier IC1 to provide the reference voltage U1, the resistor R5 and the resistor R6 divide the voltage to provide the reference voltage U2 for the IC2, the resistor D3 and the resistor D4 form an AND gate to control the triode T1 to work, the resistor R7, the resistor R8 and the capacitor C3 form an anti-interference and retention delay circuit, the diode D5 is an anti-back pressure diode, the back pressure generated by the coil of the relay J1 is prevented from puncturing the triode T1, and the normal work of the indicator lamp circuit is ensured.
The normal state is microammeter standby state, and the off indicator light LED2 is always on. When the quiescent current of the tested tool exceeds the range of the microammeter, the relay J1 is attracted, the state is switched to the ammeter test state, the LED1 is always on, when the current is larger than the set basic value of the ammeter, such as 0.75A, the relay keeps attracted, and when the current is between 200uA and 0.75A, the attracted indicator lamp LED1 and the disconnected indicator lamp LED2 are alternately flashed to indicate abnormal detection.
According to the utility model, the mains supply is converted into the power supply which can be used by the circuit through the power supply conversion circuit, the tested direct current tool is connected through the battery connector, the first current sampling circuit and the second current sampling circuit are used for collecting the current of the tested direct current tool and feeding the current back to the control circuit, the battery connector is controlled by the control circuit to be respectively electrically connected with the first current testing circuit or the second current testing circuit, so that the tested direct current tool is tested by the first current testing circuit or the second current testing circuit which is suitable for the current range of the tested direct current tool, the automatic switching of two different current testing ranges is realized, the use is convenient, the manufacturing cost is low, and the error of a testing link is effectively reduced.
While the foregoing is directed to embodiments of the present utility model, other and further details of the utility model may be had by the present utility model, it should be understood that the foregoing description is merely illustrative of the present utility model and that no limitations are intended to the scope of the utility model, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the utility model.
Claims (10)
1. The utility model provides a direct current instrument on-line test current device which characterized in that: the power supply comprises a direct current test power supply, a power supply conversion circuit, a first current test circuit, a second current test circuit, a battery connector and a first current sampling circuit, a second current sampling circuit and a control circuit, wherein the first current test circuit, the second current test circuit and the battery connector are all electrically connected with the direct current test power supply, the first current sampling circuit, the second current sampling circuit and the control circuit are all electrically connected with the control circuit and are respectively electrically connected with the first current test circuit and the second current test circuit, and the control circuit is suitable for controlling the battery connector to be respectively electrically connected with the first current test circuit or the second current test circuit.
2. The direct current tool on-line test current device according to claim 1, wherein: the control circuit comprises a relay J1 and a driving circuit electrically connected with the relay J1, the battery connector is electrically connected with a movable contact of the relay J1, and the first current testing circuit and the second current testing circuit are respectively electrically connected with a normally closed static contact and a normally open static contact of the relay J1.
3. The direct current tool on-line test current device according to claim 2, wherein: the control circuit further comprises an indicator light circuit, the indicator light circuit comprises an engaging indicator light LED1, an opening indicator light LED2, a resistor R9 and a triode T2, the engaging indicator light LED1 and a relay J1 are arranged in parallel, one end of the resistor R9 is connected with the opening indicator light LED2, the other end of the resistor R9 is connected with the b pole of the triode T2, and the c pole and the e pole of the triode T2 are respectively connected with the other end of the opening indicator light LED2 and the ground.
4. A direct current tool on-line test current device according to claim 3, wherein: the control circuit further comprises a diode D5 arranged in parallel with the relay.
5. The direct current tool on-line test current device according to claim 2, wherein: the driving circuit comprises a triode T1, a diode D3, a diode D4, a resistor R7, a resistor R8 and a capacitor C3, wherein the resistor R7, the resistor R8 and the capacitor C3 are connected with the cathodes of the diode D3 and the diode D4, the other end of the resistor R7 is connected with the pole b of the triode T1, the pole C of the triode T1 is connected with a relay J1, and the pole e is grounded with the other ends of the resistor R8 and the capacitor C3.
6. The direct current tool on-line test current device according to claim 1, wherein: the first current sampling circuit comprises a resistor R3, a resistor R4, a capacitor C2 and an operational amplifier IC1, wherein one ends of the resistor R3 and the resistor R4 are connected with the inverting input end of the operational amplifier IC1, the other ends of the resistor R3 and the resistor R4 are respectively connected with the positive electrode and the negative electrode of the output end of the power conversion circuit, the non-inverting input end of the operational amplifier IC1 is simultaneously connected with the capacitor C2 and the first current sampling circuit, and the output end of the operational amplifier IC1 is connected with the control circuit.
7. The direct current tool on-line test current device according to claim 1, wherein: the second current sampling circuit comprises a resistor R5, a resistor R6 and an operational amplifier IC2, wherein one ends of the resistor R5 and the resistor R6 are connected with the inverting input end of the operational amplifier IC2, the other ends of the resistor R5 and the resistor R6 are respectively connected with the positive electrode and the negative electrode of the output end of the power supply conversion circuit, the non-inverting input end of the operational amplifier IC2 is connected with the second current sampling circuit, and the output end of the operational amplifier IC2 is connected with the control circuit.
8. The direct current tool on-line test current device according to claim 1, wherein: the first current test circuit comprises a resistor R1, a microammeter with the measuring range of 0-200 uA, a capacitor C1, a diode D1 and a diode D2, wherein the microammeter, the capacitor C1, the diode D1 and the diode D2 are arranged in parallel, the cathode of the diode D1 and the anode of the diode D2 are grounded, the anode of the diode D1 and the cathode of the diode D2 are both connected with the resistor R1, and the other end of the resistor R1 is connected with the control circuit.
9. The direct current tool on-line test current device according to claim 1, wherein: the second current testing circuit comprises a shunt resistor R2 and an ammeter with the measuring range of 0-200A, which are arranged in parallel, wherein one end of the ammeter is grounded, and the other end of the ammeter is connected with the control circuit.
10. A direct current tool on-line test current device according to any one of claims 1 to 9, wherein: the voltage testing circuit comprises a direct current voltmeter, wherein the positive electrode and the negative electrode of the direct current voltmeter are respectively connected with the positive electrode and the negative electrode of the direct current testing power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223318299.4U CN219266388U (en) | 2022-12-09 | 2022-12-09 | DC tool on-line current testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223318299.4U CN219266388U (en) | 2022-12-09 | 2022-12-09 | DC tool on-line current testing device |
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| Publication Number | Publication Date |
|---|---|
| CN219266388U true CN219266388U (en) | 2023-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223318299.4U Active CN219266388U (en) | 2022-12-09 | 2022-12-09 | DC tool on-line current testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219266388U (en) |
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2022
- 2022-12-09 CN CN202223318299.4U patent/CN219266388U/en active Active
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