CN210803697U - AC analog resistance generator - Google Patents
AC analog resistance generator Download PDFInfo
- Publication number
- CN210803697U CN210803697U CN201921534237.2U CN201921534237U CN210803697U CN 210803697 U CN210803697 U CN 210803697U CN 201921534237 U CN201921534237 U CN 201921534237U CN 210803697 U CN210803697 U CN 210803697U
- Authority
- CN
- China
- Prior art keywords
- circuit
- shell
- electrically connected
- alternating current
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses an AC analog resistance generator, which comprises a shell, wherein a main control chip, a digital potentiometer, a voltage sampling circuit, a current sampling circuit and an operational amplifier are arranged in the shell, and an AC power supply is electrically connected with the main control chip; the shell is embedded with a pickup sensor; the shell is also internally provided with an audio processing circuit and a switching circuit, the audio processing circuit is electrically connected with the pickup sensor, the switching circuit is electrically connected with the alternating current power supply, and the switching circuit turns on and off the alternating current power supply according to the voice signal collected by the audio processing circuit; a battery for providing working voltage is also arranged in the shell. Pick up pickup sensor when using and pick up after opening alternating current power supply's speech signal, audio frequency processing circuit transmission signal of telecommunication gives switch circuit, and switch circuit opens alternating current power supply, makes the utility model discloses the input is used. Therefore, the utility model discloses accessible speech control, it is easy and simple to handle.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to an exchange analog resistance generator.
Background
In resistance detection, large current testers have been increasingly widely used, such as contact resistance, loop resistance test equipment-loop resistance testers for measuring equipment such as switches, circuit breakers, transformers, and the like; a device for measuring the dc resistance of inductive objects to be measured, such as transformers, transformers and motor windings-a dc resistance rapid measuring instrument, whose test current can range from a few amperes to hundreds of amperes. The calibration of such instruments cannot be realized by using a conventional standard resistor, because the current which can be passed by a physical standard resistor is only 30A at most, and the accuracy of the detection of the current which is greater than 30A is greatly reduced due to the influence of power, thermal stability and the like. Under the condition, the analog resistor is produced at the same time, and has the characteristics of small volume, large rated current, higher accuracy than an actual resistor, convenience in use, flexibility in operation and the like.
The analog resistor can be divided into an alternating current analog resistor, a direct current analog resistor and an alternating current and direct current analog resistor according to performance, the direct current analog resistor only outputs the alternating current resistor, and the accuracy of the common alternating current analog resistor in work is 0.05% at most. However, most of the existing ac analog resistor generators adopt a display screen for displaying, so that the use of the existing ac analog resistor generators is limited.
Disclosure of Invention
To the above-mentioned not enough, the utility model discloses the technical problem that will solve is: an AC analog resistance generator with voice operation function is provided.
In order to solve the technical problem, the technical scheme of the utility model is that:
an alternating current analog resistance generator comprises a shell, wherein a main control chip, a digital potentiometer, a voltage sampling circuit, a current sampling circuit and an operational amplifier are arranged in the shell, and an alternating current power supply is electrically connected with the main control chip; the output end of the main control chip is connected with the digital potentiometer; the digital potentiometer is connected with the output end of the voltage sampling circuit, and the output end of the digital potentiometer is connected with the positive phase input end of the operational amplifier; the output end of the current sampling circuit is connected with the inverting input end of the operational amplifier; a load is connected between the output end of the operational amplifier and the output end of the current sampling circuit; the shell is embedded with a pickup sensor; the shell is internally provided with an audio processing circuit and a switch circuit, the audio processing circuit is electrically connected with the pickup sensor, the switch circuit is electrically connected with the alternating current power supply, and the switch circuit turns on and off the alternating current power supply according to a voice signal collected by the audio processing circuit; and a battery for providing working voltage is also arranged in the shell.
Preferably, the shell is further embedded in a power switch, the power switch is electrically connected with the switch circuit, and the switch circuit turns on and off the alternating current power supply according to the electric signal transmitted by the power switch.
Preferably, the switch circuit comprises a relay, the audio processing circuit and the power switch are respectively electrically connected with a trigger coil of the relay, and a normally open contact of the relay is electrically connected with the alternating current power supply.
Preferably, the shell is further provided with a display screen electrically connected with the main control chip.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
the utility model comprises a shell, wherein a main control chip, a digital potentiometer, a voltage sampling circuit, a current sampling circuit and an operational amplifier are arranged in the shell, and an alternating current power supply is electrically connected with the main control chip; the shell is embedded with a pickup sensor; the shell is also internally provided with an audio processing circuit and a switching circuit, the audio processing circuit is electrically connected with the pickup sensor, the switching circuit is electrically connected with the alternating current power supply, and the switching circuit turns on and off the alternating current power supply according to the voice signal collected by the audio processing circuit; a battery for providing working voltage is also arranged in the shell. Pick up pickup sensor when using and pick up after opening alternating current power supply's speech signal, audio frequency processing circuit transmission signal of telecommunication gives switch circuit, and switch circuit opens alternating current power supply, makes the utility model discloses the input is used. It is thus clear that the utility model discloses an alternating current analog resistance generator, accessible speech control, it is easy and simple to handle.
Drawings
Fig. 1 is a schematic structural diagram of an ac analog resistance generator according to the present invention;
fig. 2 is a circuit diagram of an ac analog resistance generator according to the present invention;
fig. 3 is a schematic block diagram of an ac analog resistance generator according to the present invention;
FIG. 4 is a functional block diagram of an embodiment;
in the figure: 1-shell, 2-pillar, 3-load output end, 4-pickup sensor, 5-display screen, 7-power switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 4, an ac analog resistance generator includes a housing 1, a pillar 2 is disposed at the bottom of the housing 1, a main control chip, a digital potentiometer, a voltage sampling circuit, a current sampling circuit, and an operational amplifier are disposed in the housing 1, and an ac power supply is electrically connected to the main control chip; the main control chip preferably selects a single chip microcomputer chip, and the output end of the main control chip is connected with the digital potentiometer; the digital potentiometer is connected with the output end of the voltage sampling circuit, and the output end of the digital potentiometer is connected with the positive phase input end of the operational amplifier; the output end of the current sampling circuit is connected with the inverting input end of the operational amplifier; a load is connected between the output end of the operational amplifier and the output end of the current sampling circuit, and particularly a constant resistor is output at a load output end 3; a pickup sensor 4 is embedded on the shell 1; the shell 1 is also internally provided with an audio processing circuit and a switching circuit, the audio processing circuit is electrically connected with the pickup sensor 4, the switching circuit is electrically connected with an alternating current power supply, and the switching circuit turns on and off the alternating current power supply according to a voice signal collected by the audio processing circuit; a battery for supplying an operating voltage is also provided in the housing 1.
In this embodiment, the power switch 6 is further embedded in the housing 1, the power switch 6 is electrically connected to the switch circuit, and the switch circuit turns on and off the ac power according to the electric signal transmitted by the power switch 6. The switch circuit comprises a relay, the audio processing circuit and the power switch 6 are respectively electrically connected with a trigger coil of the relay, and a normally open contact of the relay is electrically connected with an alternating current power supply.
The shell 1 is also provided with a display screen 5 electrically connected with the main control chip.
As shown in fig. 1 to 4, when the present embodiment is used, the voice command can be preset in the chip of the single chipSuch as "open", "closed". When the user says "open", the voice is collected by the pickup sensor 44, and after the voice signal is transmitted to the audio processing circuit, the audio processing circuit outputs a corresponding electric signal to the trigger coil of the relay, so that the normally open contact of the relay acts and is closed, and the alternating current power supply is put into use. In this embodiment, the circuit mainly comprises a main control chip, a digital potentiometer W, a voltage sampling amplifier A1, an operational amplifier A2, and a sampling resistor
And a current sampling amplifier A3.
As shown in FIG. 3, the voltage applied to both ends of the present analog load by the AC power source is
As the load output terminal 3 in fig. 1, the load current flowing through the circuit is
。
According to the circuit connection relationship, the voltage U1 at the non-inverting input terminal of the operational amplifier A2 is easily obtained as the following expression:
；
wherein:
voltage amplification factor of voltage sampling amplifier A1;
is a voltage applied across the circuit;
digital quantity output for the main control chip;
is the control bit number of the digital potentiometer W.
Voltage at inverting input of operational amplifier a2
The following relationship is satisfied:
wherein:
is the load current flowing through the circuit;
the resistance value is sampled for the current.
Since the circuit has a closed-loop negative feedback, it is known from the characteristics of the operational amplifier that U1 should be equal to U2, that is:
further, the simulated resistance Rx at two ends of the circuit can be obtained as the following expression:
wherein:
is the voltage added to the two ends of the analog load;
is the load current flowing through the circuit;
voltage amplification factor of voltage sampling amplifier A1;
digital quantity output for the main control chip;
being digital potentiometers WA control bit number;
is the resistance value of the sampling resistor.
Obviously, thanks to the clever design of the circuit, by using a high-precision sampling resistor
Different resistances can be simulated by matching with the control of the digital potentiometer, and the simulation resistance and the sampling resistance
Has the same high-precision performance. If the amplification factor of the voltage sampling amplifier A1 is cooperatively amplified by the main control chip
Properly controlled and matched with different sampling resistors
The circuit can simulate the resistance value in a wide range, and the circuit can be used for a direct current circuit and is also suitable for an alternating current circuit. Therefore, the utility model discloses the scheme can realize programme-controlled alternating current-direct current resistance box's function.
The above-mentioned preferred embodiments of the present invention are not intended to limit the present invention, and any modifications made within the spirit and principles of the present invention, equivalent to the improvement of the ac analog resistance generator structure, should be included within the scope of the present invention.
Claims (4)
1. The alternating current analog resistance generator comprises a shell, wherein a main control chip, a digital potentiometer, a voltage sampling circuit, a current sampling circuit and an operational amplifier are arranged in the shell, and an alternating current power supply is electrically connected with the main control chip;
the output end of the main control chip is connected with the digital potentiometer;
the digital potentiometer is connected with the output end of the voltage sampling circuit, and the output end of the digital potentiometer is connected with the positive phase input end of the operational amplifier;
the output end of the current sampling circuit is connected with the inverting input end of the operational amplifier; a load is connected between the output end of the operational amplifier and the output end of the current sampling circuit;
it is characterized in that the preparation method is characterized in that,
the shell is embedded with a pickup sensor;
the shell is internally provided with an audio processing circuit and a switch circuit, the audio processing circuit is electrically connected with the pickup sensor, the switch circuit is electrically connected with the alternating current power supply, and the switch circuit turns on and off the alternating current power supply according to a voice signal collected by the audio processing circuit;
and a battery for providing working voltage is also arranged in the shell.
2. The ac analog resistance generator according to claim 1, wherein a power switch is further embedded in the housing, the power switch is electrically connected to the switching circuit, and the switching circuit turns on and off the ac power according to an electrical signal transmitted from the power switch.
3. An ac analog resistance generator as claimed in claim 2, wherein the switching circuit comprises a relay, the audio processing circuit and the power switch are electrically connected to a trigger coil of the relay, respectively, and the normally open contact of the relay is electrically connected to the ac power source.
4. The alternating current analog resistance generator according to claim 1, wherein a display screen electrically connected with the main control chip is further disposed on the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921534237.2U CN210803697U (en) | 2019-09-16 | 2019-09-16 | AC analog resistance generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921534237.2U CN210803697U (en) | 2019-09-16 | 2019-09-16 | AC analog resistance generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210803697U true CN210803697U (en) | 2020-06-19 |
Family
ID=71227635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921534237.2U Active CN210803697U (en) | 2019-09-16 | 2019-09-16 | AC analog resistance generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210803697U (en) |
-
2019
- 2019-09-16 CN CN201921534237.2U patent/CN210803697U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5136234A (en) | Digital high-voltage meter device | |
| JP6605237B2 (en) | Current measuring device | |
| US4704575A (en) | Hall-effect current clamp | |
| Li et al. | Study of the virtual instrumentation applied to measure pulsed heavy currents | |
| CN106298214B (en) | A kind of wide-range Zero flux current ratio converter | |
| CN210803697U (en) | AC analog resistance generator | |
| CN102736049B (en) | Wireless-remote-control simulated dielectric loss device | |
| KR100605023B1 (en) | apparatus for measuring current using rogowski coil | |
| CN207007941U (en) | A kind of insulating megger | |
| US6429643B1 (en) | Device for measuring power using switchable impedance | |
| CN209070092U (en) | Portable voltage-withstand test instrument correcting device | |
| CN206557347U (en) | A kind of relay checking instrument | |
| CN115469139A (en) | Current measuring device and method | |
| CN202522689U (en) | Magnetic induction intensity measuring device based on Hall effect | |
| CN211426770U (en) | Critical current testing device for short sample of superconducting cable | |
| CN211402545U (en) | Experimental device for measuring resistance by using oscilloscope | |
| CN206096228U (en) | Portable clip on ammeter | |
| CN212060482U (en) | Circuit detection device | |
| JP2007206006A (en) | Transformer measuring method, evaluation facilities, and transformer using the same | |
| CN207601260U (en) | Relay is attracted effect detection device and controller for electric vehicle | |
| CN206098134U (en) | Wide -range zero flux current ratio converter | |
| CN215116648U (en) | Device for measuring action power of high-power relay and high-power switch-in | |
| CN206146988U (en) | Portable clip on ammeter | |
| CN215770827U (en) | Protection and metering integrated current transformer | |
| CN215263720U (en) | Tester capable of measuring contact resistance and opening and closing time of high-voltage switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |