CN211348377U - Electric parameter measuring instrument - Google Patents
Electric parameter measuring instrument Download PDFInfo
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- CN211348377U CN211348377U CN201922088244.0U CN201922088244U CN211348377U CN 211348377 U CN211348377 U CN 211348377U CN 201922088244 U CN201922088244 U CN 201922088244U CN 211348377 U CN211348377 U CN 211348377U
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Abstract
The utility model relates to the field of measuring instruments, and discloses an electrical parameter measuring instrument, which comprises a single chip microcomputer, a touch screen, a memory, an electrical signal input module, a clock signal module, a reset module and a power module, wherein the single chip microcomputer is respectively connected with the touch screen, the memory, the electrical signal input module, the clock signal module, the reset module and the power module; the power module comprises a first resistor, a rectifier bridge, a first capacitor, a second resistor, a fourth diode, a first triode, a second triode, a third resistor, a fourth resistor, a solar panel, a sixth resistor, a storage battery, a relay, a fifth resistor, a first diode, a second diode and a voltage output end, one end of the first resistor is connected with one end of 220V alternating current, and the other end of the first resistor is connected with an alternating current input end of the rectifier bridge. Implement the utility model discloses an electrical parameter measuring instrument has following beneficial effect: the circuit has high safety and reliability and meets the requirement of safe power supply.
Description
Technical Field
The utility model relates to a measuring instrument field, in particular to electrical parameter measuring instrument.
Background
The electrical parameter measuring instrument is mainly used for measuring electrical parameters of related instruments, such as voltage, current, electric power and the like. The electrical parameter measuring instrument mainly comprises a digital electrical parameter measuring instrument, a single-phase electrical parameter measuring instrument, a three-phase electrical parameter measuring instrument and the like. The digital power parameter measuring instrument adopts a surface-mounted technology, has smaller volume and more stable quality, has rich interface functions and measuring functions, and can meet the detection requirements of laboratory power frequency products. In the prior art, some power supply parts of the electrical parameter measuring instrument lack corresponding circuit protection functions, such as: the lack of current-limiting protection causes the safety and reliability of the circuit to be lower, and the requirement of safe power supply is not met.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide the electrical parameter measuring apparatu of the requirement that security and reliability of a circuit are higher, accord with safe power supply.
The utility model provides a technical scheme that its technical problem adopted is: the electric parameter measuring instrument comprises a single chip microcomputer, a touch screen, a memory, an electric signal input module, a clock signal module, a reset module and a power supply module, wherein the single chip microcomputer is respectively connected with the touch screen, the memory, the electric signal input module, the clock signal module, the reset module and the power supply module;
the power module comprises a first resistor, a rectifier bridge, a first capacitor, a second resistor, a fourth diode, a first triode, a second triode, a third resistor, a fourth resistor, a solar panel, a sixth resistor, a storage battery, a relay, a fifth resistor, a first diode, a second diode and a voltage output end, one end of the first resistor is connected with one end of 220V alternating current, the other end of the first resistor is connected with an alternating current input end of the rectifier bridge, the other alternating current input end of the rectifier bridge is connected with the other end of the 220V alternating current, a direct current output end of the rectifier bridge is respectively connected with one end of the first capacitor, one end of the second resistor and a collector electrode of the first triode, a base electrode of the first triode is respectively connected with the other end of the second resistor, a cathode of the fourth diode and a collector electrode of the second triode, an emitting electrode of the first triode is respectively connected with one end of the third resistor and one end of a second contact of the relay, a base electrode of the second triode is respectively connected with the other end of the third resistor and one end of the fourth resistor, one end of the solar panel is connected with one end of the sixth resistor, the other end of the sixth resistor is respectively connected with one end of a first contact of the relay, one end of the fifth resistor and an anode of the second diode, the other end of the first contact of the relay is connected with an anode of the storage battery, the other end of the fifth resistor is connected with a cathode of the first diode, an anode of the first diode is connected with one end of a coil of the relay, and the other end of the second contact of the relay is respectively connected with a cathode of the second diode and a voltage output end, and the other direct current output end of the rectifier bridge is respectively connected with the other end of the first capacitor, the anode of the fourth diode, the emitting electrode of the second triode, the other end of the fourth resistor, the other end of the solar panel, the cathode of the storage battery, the other end of the coil of the relay and the other end of the voltage output end.
In the electrical parameter measuring apparatus of the present invention, the resistance of the sixth resistor is 32k Ω.
In the electrical parameter measuring apparatus of the present invention, the power module further includes a third diode, an anode of the third diode is connected to the emitter of the second triode, and a cathode of the third diode is connected to the other end of the first capacitor.
In the electrical parameter measuring apparatus of the present invention, the third diode has a model of E-562.
In the electrical parameter measuring apparatus of the present invention, the first transistor is an NPN transistor.
In the electrical parameter measuring apparatus of the present invention, the second transistor is an NPN transistor.
Implement the utility model discloses an electrical parameter measuring instrument has following beneficial effect: the touch control device is provided with a singlechip, a touch control screen, a memory, an electric signal input module, a clock signal module, a reset module and a power supply module; the power module comprises a first resistor, a rectifier bridge, a first capacitor, a second resistor, a fourth diode, a first triode, a second triode, a third resistor, a fourth resistor, a solar panel, a sixth resistor, a storage battery, a relay, a fifth resistor, a first diode, a second diode and a voltage output end, wherein the sixth resistor is used for current-limiting protection, so that the safety and the reliability of the circuit are high, and the requirement of safe power supply is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the electrical parameter measuring apparatus of the present invention;
fig. 2 is a schematic circuit diagram of the power supply module in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the embodiment of the electrical parameter measuring apparatus of the present invention, a schematic structural diagram of the electrical parameter measuring apparatus is shown in fig. 1. In fig. 1, the electrical parameter measuring instrument includes a single chip microcomputer 1, a touch screen 2, a memory 3, an electrical signal input module 4, a clock signal module 5, a reset module 6 and a power module 7, wherein the single chip microcomputer 1 is connected to the touch screen 2, the memory 3, the electrical signal input module 4, the clock signal module 5, the reset module 6 and the power module 7 respectively.
The model number adopted by the singlechip 1 is S3C 2410. The touch screen 2 is used for receiving user input and providing a display interface for a user. The memory 3 is used for storing electrical engineering data. The electrical signal input module 4 is used for converting the input electrical signal into a digital signal. Therefore, the functions of the data multimeter and the digital oscilloscope can be realized through the electric signal input module 4 and the singlechip 1. The clock signal module 5 is used for providing a clock signal, and the power supply module 7 is used for supplying power to the electrical parameter measuring instrument. The reset module 6 is used for providing a reset signal.
In this embodiment, the single chip microcomputer 1, the touch screen 2, the memory 3, the electrical signal input module 4, the clock signal module 5, and the reset module 6 are all implemented by using a structure in the prior art, and the working principle thereof is also the working principle in the prior art, which is not described in detail herein.
Fig. 2 is a schematic circuit diagram of the power module in this embodiment, in fig. 2, the power module 7 includes a first resistor R1, a rectifier bridge Z, a first capacitor C1, a second resistor R2, a fourth diode D4, a first transistor Q1, a second transistor Q2, a third resistor R3, a fourth resistor R4, a solar panel T, a sixth resistor R6, a battery E, a relay, a fifth resistor R5, a first diode D1, a second diode D2, and a voltage output Vo, wherein one end of the first resistor R1 is connected to one end of the 220V ac power, the other end of the first resistor R1 is connected to one ac input end of the rectifier bridge Z, the other ac input end of the rectifier bridge Z is connected to the other end of the 220V ac power, one dc output end of the rectifier bridge Z is connected to one end of the first capacitor C1, one end of the second resistor R2 and the collector of the first transistor Q1, and the base of the first resistor Q2 is connected to the other end of the second resistor Q1 5, The cathode of the fourth diode D4 is connected with the collector of the second triode Q2, the emitter of the first triode Q1 is connected with one end of the third resistor R3 and one end of the second contact J-2 of the relay respectively, the base of the second triode Q2 is connected with the other end of the third resistor R3 and one end of the fourth resistor R4 respectively, one end of the solar panel T is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected with one end of the first contact J-1 of the relay, one end of the fifth resistor R5 and the anode of the second diode D2 respectively, the other end of the first contact J-1 of the relay is connected with the anode of the battery E, the other end of the fifth resistor R5 is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with one end of the coil J of the relay, the other end of the second contact J-2 of the relay is connected with the cathode of the second diode D2 and the voltage output end respectively, the other direct current output end of the rectifier bridge Z is respectively connected with the other end of the first capacitor C1, the anode of the fourth diode D4, the emitter of the second triode Q2, the other end of the fourth resistor R4, the other end of the solar panel T, the cathode of the storage battery E, the other end of the coil J of the relay and the other end of the voltage output end Vo.
In this embodiment, the sixth resistor R6 is a current limiting resistor for performing current limiting protection. The current limiting protection principle is as follows: when the emitter current of the first triode Q1 is large, the emitter current of the first triode Q1 can be reduced by the fifth resistor R5 to keep the first triode Q1 in a normal working state, and the elements in the circuit are not burnt out due to too large current, so that the safety and reliability of the circuit are high, and the requirement of safe power supply is met. It should be noted that, in the present embodiment, the resistance of the sixth resistor R6 is 32k Ω. Of course, in practical applications, the resistance of the sixth resistor R6 may be adjusted according to specific situations, that is, the resistance of the sixth resistor R6 may be increased or decreased according to specific situations.
The working principle of the power module 7 is as follows: under the condition of sufficient illumination in the daytime, the solar panel T completes photoelectric conversion and transmits electric energy out through the sixth resistor R6, the voltage of the solar panel T is enough to enable the second diode D2 to be conducted through the fifth resistor R5, so that the relay is electrified, the first contact J-1 of the relay is attracted, the second contact J-2 of the relay is disconnected, the storage battery E is charged and is simultaneously supplied for the singlechip 1 to use, if the voltage of the storage battery E is insufficient in rainy days for a long time, the output voltage of the storage battery E is not enough to break through the first diode D1, so that the relay is disconnected, the second contact J-2 of the relay is attracted, 220V alternating current is reduced in voltage through the first resistor R1 and then enters the rectifier bridge Z for rectification, and direct current voltage output from a direct current output end of the rectifier bridge Z enters a voltage protection circuit consisting of the second resistor R2, the third resistor R3, the first triode Q1 and the second triode Q2, under normal conditions, the voltage divided by the second resistor R2 and the fourth diode D4 enables the first triode Q1 to be conducted, the power is supplied to the single chip microcomputer 1 after passing through the second contact J-2 of the relay, when under-voltage conditions occur, the voltage divided by the second resistor R2 and the fourth diode D2 is not enough to enable the first triode Q1 to be conducted, the single chip microcomputer 1 is prevented from being damaged by under-voltage, the third resistor R3, the fourth resistor R4 and the second triode Q2 form an overvoltage protection circuit, when the output voltage is higher than a set value, the voltage divided by the second resistor R2 and the third resistor R3 enables the second triode Q2 to be conducted, and the base voltage of the first triode Q1 is bypassed, so that the purpose of overvoltage protection is achieved.
In this embodiment, the first transistor Q1 is an NPN transistor. The second transistor Q2 is an NPN transistor. Certainly, in practical applications, the first transistor Q1 and the second transistor Q2 may both adopt PNP transistors, but the circuit structure is also changed accordingly.
In this embodiment, the power module 7 further includes a third diode D3, an anode of the third diode D3 is connected to an emitter of the second transistor Q2, and a cathode of the third diode D3 is connected to the other end of the first capacitor C1. The third diode D3 is a current limiting diode, and is used for current limiting protection of the emitter current of the second transistor Q2. The current limiting protection principle is as follows: when the emitter current of the second triode Q2 is large, the third diode D3 can reduce the emitter current of the second triode Q2 to keep the second triode Q2 in a normal working state, so that the elements in the circuit are not burned out due to too large current, and the safety and reliability of the circuit are further improved. It should be noted that in the present embodiment, the third diode D3 has a model number of E-562. Of course, in practical applications, the third diode D3 may also be another type of diode with similar functions.
In a word, in this embodiment, because the current-limiting resistor is arranged in the power module 7, the utility model discloses the security and the reliability of circuit are higher, accord with the requirement of safe power supply.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An electrical parameter measuring instrument is characterized by comprising a single chip microcomputer, a touch screen, a memory, an electrical signal input module, a clock signal module, a reset module and a power supply module, wherein the single chip microcomputer is respectively connected with the touch screen, the memory, the electrical signal input module, the clock signal module, the reset module and the power supply module;
the power module comprises a first resistor, a rectifier bridge, a first capacitor, a second resistor, a fourth diode, a first triode, a second triode, a third resistor, a fourth resistor, a solar panel, a sixth resistor, a storage battery, a relay, a fifth resistor, a first diode, a second diode and a voltage output end, one end of the first resistor is connected with one end of 220V alternating current, the other end of the first resistor is connected with an alternating current input end of the rectifier bridge, the other alternating current input end of the rectifier bridge is connected with the other end of the 220V alternating current, a direct current output end of the rectifier bridge is respectively connected with one end of the first capacitor, one end of the second resistor and a collector electrode of the first triode, a base electrode of the first triode is respectively connected with the other end of the second resistor, a cathode of the fourth diode and a collector electrode of the second triode, an emitting electrode of the first triode is respectively connected with one end of the third resistor and one end of a second contact of the relay, a base electrode of the second triode is respectively connected with the other end of the third resistor and one end of the fourth resistor, one end of the solar panel is connected with one end of the sixth resistor, the other end of the sixth resistor is respectively connected with one end of a first contact of the relay, one end of the fifth resistor and an anode of the second diode, the other end of the first contact of the relay is connected with an anode of the storage battery, the other end of the fifth resistor is connected with a cathode of the first diode, an anode of the first diode is connected with one end of a coil of the relay, and the other end of the second contact of the relay is respectively connected with a cathode of the second diode and a voltage output end, and the other direct current output end of the rectifier bridge is respectively connected with the other end of the first capacitor, the anode of the fourth diode, the emitting electrode of the second triode, the other end of the fourth resistor, the other end of the solar panel, the cathode of the storage battery, the other end of the coil of the relay and the other end of the voltage output end.
2. The electrical parameter measuring instrument according to claim 1, wherein the sixth resistor has a resistance of 32k Ω.
3. The electrical parameter measuring instrument of claim 1, wherein the power supply module further comprises a third diode, an anode of the third diode is connected to the emitter of the second transistor, and a cathode of the third diode is connected to the other end of the first capacitor.
4. The electrical parameter measuring instrument of claim 3, wherein the third diode is type E-562.
5. An electrical parameter measuring instrument according to any one of claims 1 to 4, wherein the first transistor is an NPN transistor.
6. An electrical parameter measuring instrument according to any one of claims 1 to 4, wherein the second transistor is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922088244.0U CN211348377U (en) | 2019-11-27 | 2019-11-27 | Electric parameter measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922088244.0U CN211348377U (en) | 2019-11-27 | 2019-11-27 | Electric parameter measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211348377U true CN211348377U (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922088244.0U Active CN211348377U (en) | 2019-11-27 | 2019-11-27 | Electric parameter measuring instrument |
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| Country | Link |
|---|---|
| CN (1) | CN211348377U (en) |
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2019
- 2019-11-27 CN CN201922088244.0U patent/CN211348377U/en active Active
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