CN213780237U - Full-time detection device for working state of large laboratory instrument - Google Patents
Full-time detection device for working state of large laboratory instrument Download PDFInfo
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Abstract
The utility model discloses a large-scale instrument operating condition detection device when full in laboratory, include: the device comprises an alternating current/direct current acquisition module, an analog-to-digital conversion module, a single chip microcomputer, a clock chip, a memory and control keys; the alternating current/direct current acquisition module is electrically connected with the large laboratory instrument and is used for acquiring alternating current or direct current output by the large laboratory instrument in different operation states; the analog-to-digital conversion module is used for receiving the alternating current numerical value acquired by the alternating current/direct current acquisition module in real time and outputting the relative magnitude of the alternating current numerical value and the reference voltage; the singlechip is used for controlling the memory to store alternating current numerical values in a classified manner according to the frequency node selected by the control key and the output result of the analog-to-digital conversion module. The utility model discloses can carry out real-time statistical analysis to the rate of utilization of the important instrument in laboratory to judge qualitative and quantitative index of instrument operating condition according to the record result, in order to maintain and maintain the instrument in advance.
Description
Technical Field
The utility model relates to an equipment detects technical field, and more specifically the utility model relates to a large-scale instrument operating condition full-time detection device in laboratory that says so.
Background
The types of large-scale laboratory instruments and equipment are generally classified into pretreatment types, spectrum types, inorganic types, organic types, medical microorganism types and the like, and the operating states of the instruments and equipment are roughly classified into 3 types: a power off state, a standby state, and a use state. When the device is in different operating states, its operating power is different.
At present, a device which is specially used for carrying out full-time detection on daily use states of large-scale instruments in a laboratory is not provided, so that the utilization rate of key instruments and equipment in the laboratory cannot be counted and analyzed in real time, and early warning cannot be carried out on maintenance and repair of the instruments and equipment. It is not practical to rely on manual statistics and analysis. Manual statistics not only easily causes inaccuracy of data recording, but also increases workload of operators.
Therefore, it is an urgent need to solve the problem of the art to provide a detection device capable of recording and counting the working state of large laboratory instruments in real time, and performing maintenance and repair warning on the instruments according to the statistical result.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a large-scale instrument operating condition detection device in laboratory when full can carry out real-time statistics analysis to the rate of utilization of the important instrument in laboratory to judge qualitative and quantitative index of instrument operating condition according to the record result, in order to maintain and maintain the instrument in advance.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a full-time detection device for working states of large laboratory instruments comprises: the device comprises an alternating current/direct current acquisition module, an analog-to-digital conversion module, a single chip microcomputer, a clock chip, a memory and control keys;
the alternating current/direct current acquisition module is electrically connected with the large laboratory instrument and is used for acquiring alternating current or direct current output by the large laboratory instrument in different running states and converting the direct current into alternating current;
the analog-to-digital conversion module is electrically connected with the alternating current/direct current acquisition module and the single chip microcomputer respectively, and is used for receiving an alternating current numerical value acquired by the alternating current/direct current acquisition module in real time and outputting the relative magnitude of the alternating current numerical value and a reference voltage;
the single chip microcomputer is electrically connected with the clock chip, the memory and the control key respectively;
the control key is used for selecting frequency nodes of the large laboratory instrument in different working states;
the single chip microcomputer is used for controlling the memory to store the alternating current numerical value in a classified mode according to the frequency node selected by the control key and the output result of the analog-to-digital conversion module.
Known through foretell technical scheme, compare with prior art, the utility model discloses following beneficial effect has:
the utility model discloses a compatible preferred can be applicable to the large-scale instrument in laboratory that adopts alternating current power supply or two kinds of different forms of DC power supply simultaneously through interchange/DC collection module to the completion carries out the current sampling to different kinds of large-scale instrument. The current state of the instrument is judged in real time through the analog-to-digital conversion module, the singlechip control memory is used for classifying and storing the data of different running states of the instrument according to the preset time interval, the process can be used for carrying out real-time statistical analysis on the utilization rate of important instruments in a laboratory, and qualitative and quantitative indexes of the working state of the instrument are judged according to the recorded result so as to maintain and maintain the instrument in advance.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the ac/dc acquisition module includes an ac power supply module, an ac current collector, a dc power supply module and an ac voltage converter; the alternating current power supply module and the direct current power supply module are respectively electrically connected with the large laboratory equipment; the alternating current collector is electrically connected with the alternating current power supply module and is used for receiving alternating current output by the alternating current power supply module; the alternating current voltage converter is electrically connected with the direct current power supply module and the alternating current collector respectively and is used for converting direct current output by the direct current power supply module into alternating current and transmitting the converted alternating current to the alternating current collector; the alternating current collector is electrically connected with the analog-to-digital conversion module.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the alternating current power supply module comprises a power supply lead-in wire and a distribution box; the power supply lead-in wires are electrically connected with the laboratory large-scale instrument and the distribution box respectively.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the alternating current collector consists of a current transformer and a sampling resistor; the sampling resistor is used for carrying out I/V conversion on the alternating current induced by the current transformer.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the ac voltage converter is an AD536 chip.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the analog-to-digital conversion module includes a reference voltage source and an analog-to-digital converter which are electrically connected; the reference voltage source is used for providing reference voltage for the analog-to-digital converter; the analog-to-digital converter is used for outputting the relative magnitude of the dynamic voltage value and the reference voltage to the single chip microcomputer according to the dynamic voltage value output by the alternating current collector and the reference voltage output by the reference voltage source.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the reference voltage source adopts an MC1403 chip; the analog-to-digital converter adopts an MC14433P chip; the single chip microcomputer is an STC15F4K single chip microcomputer.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the model of the clock chip is DS 1302; the alternating current collector is used for collecting alternating current output by the alternating current power supply module or alternating current output by the alternating voltage converter at equal intervals according to the timing of the clock chip.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the memory is a nonvolatile memory.
Preferably, in the full-time detection device for the working state of the large laboratory instrument, the full-time detection device further comprises a display screen and an LED state indicator lamp; the display screen and the LED status indicator lamp are respectively electrically connected with the singlechip; the display screen is used for displaying time information and current information in real time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a block diagram illustrating a full-time detection device for a large laboratory instrument according to the present invention;
fig. 2 is a schematic circuit diagram of an ac current collector provided by the present invention;
fig. 3 is a schematic circuit diagram of an ac voltage converter according to the present invention;
fig. 4 is a schematic circuit diagram of an analog-to-digital conversion module provided by the present invention;
fig. 5 is a schematic circuit diagram of a clock chip according to the present invention;
fig. 6 is a schematic diagram of the connection between the memory and the single chip microcomputer provided by the present invention.
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.
As shown in FIG. 1, the embodiment of the utility model discloses large-scale instrument operating condition detection device during full time in laboratory, include: the device comprises an alternating current/direct current acquisition module 1, an analog-to-digital conversion module 2, a single chip microcomputer 3, a clock chip 4, a memory 5 and a control key 6;
the alternating current/direct current acquisition module 1 is electrically connected with a large laboratory instrument, and is used for acquiring alternating current or direct current output by the large laboratory instrument in different operation states and converting the direct current into alternating current;
the analog-to-digital conversion module 2 is electrically connected with the alternating current/direct current acquisition module and the single chip microcomputer respectively, and is used for receiving the alternating current numerical value acquired by the alternating current/direct current acquisition module 1 in real time and outputting the relative magnitude of the alternating current numerical value and the reference voltage;
the singlechip 3 is respectively and electrically connected with the clock chip 4, the memory 5 and the control key 6;
the control key 6 is used for selecting frequency nodes of a large laboratory instrument in different working states;
the singlechip 3 is used for controlling the memory 5 to store alternating current numerical values in a classified manner according to the frequency node selected by the control key 6 and the output result of the analog-to-digital conversion module 2.
The utility model discloses the current sampling that the large-scale instrument work of direct current and alternating current can be compatible to the confidence, and what most instruments adopted in the laboratory is 220v alternating current or 380v alternating current, but some special instruments still use the direct current, for example electrochemical workstation, microbial fuel electrode etc.. Therefore, it is necessary to develop an ac/dc acquisition module compatible with dc and ac.
Current sampling is the most common and basic principle in the development process of electronic products, and the main detection method comprises the following steps: direct sampling and indirect sampling.
Direct sampling, i.e., the manner in which current flows through a resistor to create a voltage drop. The method is generally adopted in some applications requiring high precision and low cost, for example, instruments such as multimeters and the like adopt a constantan wire mode and an operational amplifier, the structure is complex, the precision is high, the cost is high, the mode needs to be connected in series in a loop for collection, and the sampling monitoring in the operation of the instruments still has some limitations.
Indirect sampling, typically using the principle of mutual inductance. Mutual inductance must be an alternating current to be effective, such as a transformer, a split-core ammeter, etc. Its advantages are simple structure, low cost, large size, high accuracy and only measuring AC current. If direct current adopts indirect measurement, a Hall sensor utilizing the Hall principle is needed. For example, the current probe for the oscillograph can identify alternating current and direct current, and is a high-precision sensor and expensive.
Specifically, the ac/dc acquisition module 1 includes an ac power supply module 101, an ac current collector 102, a dc power supply module 103, and an ac voltage converter 104; the alternating current power supply module 101 and the direct current power supply module 103 are respectively electrically connected with large-scale laboratory equipment; the alternating current collector 102 is electrically connected with the alternating current power supply module 101 and is used for receiving alternating current output by the alternating current power supply module 101; the alternating current voltage converter 104 is electrically connected to the direct current power module 103 and the alternating current collector 102, and is configured to convert direct current output by the direct current power module 103 into alternating current and transmit the converted alternating current to the alternating current collector 102; the ac current collector 102 is electrically connected to the analog-to-digital conversion module 2.
The utility model discloses an alternating current collector 102 and alternating voltage converter 104 fitting module accomplish real-time supervision instrument working current intensity, can be applicable to the large-scale instrument in laboratory that adopts two kinds of different forms of alternating current power supply or direct current power supply simultaneously to the completion carries out the current sampling to different kinds of large-scale instrument.
The ac power supply module 101 includes a power supply lead-in wire and a distribution box; the power supply lead-in wires are respectively and electrically connected with the large-scale laboratory instrument and the distribution box. The power lead-in wire is a 380V or 220V power frequency power supply, which is generally a three-phase four-wire lead-in wire according to comprehensive consideration of load current, cable material, laying environment and the like, an A phase wire, a B phase wire, a C phase wire and a zero wire are distributed to load through a distribution wire, and the power lead-in wire can adapt to an instrument powered by single-phase AC220V, a heater powered by three-phase 380VAC and the use of high-power equipment of a motor. Distribution boxes are typically comprised of in-box distribution wiring, air switches, earth leakage protection switches, current displays, accessory assembly slides, and the like.
In one embodiment, as shown in fig. 2, the ac current collector 102 is composed of a current transformer CT and a sampling resistor R1; two ends of the current transformer CT are connected with two ends of the sampling resistor R1. The sampling resistor R1 is used for I/V conversion of the alternating current induced by the current transformer CT.
The current transformer is a special transformer consisting of a closed iron core and a winding, and is a standard electrical component for converting a primary side power frequency large current into a secondary side small current to measure according to an electromagnetic induction principle. Its primary side (with few winding turns, even 1 turn) is strung in the line of the current to be measured. For example, a current transformer of 50/5 standard, that is to say the maximum primary range I1When the current is 50 amperes (A), the secondary side is as follows: 1 (transformation coefficient Ki ═ I)1/I210) applying a current I2At 5A, the measurement circuit is electrically isolated from the high voltage of the circuit under test. One current transformer is used for single-phase 220V, and three current transformers are used for three-phase 380V. The secondary side alternating current of the current transformer needs to realize I/V conversion through a sampling precision resistor, so that a power frequency voltage corresponding to the measured current is output. Since the secondary full-scale current is 5 amperes, the sampling resistor has the current bearing capacity of not less than 5A besides sufficient accuracy and stability. For example, when the full-scale voltage drop is selected to be an effective value of 0.2V, the resistance value R of the sampling resistor is 0.2/5, 0.04 ohm (Ω) is 40 milliohm (m Ω), the consumed power P of the sampling resistor is 1W, and the low-value resistor can only adopt a special resistor customized specially.
In another embodiment, the ac voltage is measured by peak, average, and effective values, and the average of the ac voltage is measured by a conventional pointer multimeter and a conventional digital multimeter. Since existing true effective value converter integrated devices such as AD536, AD637, AD737 are available, it is most convenient to use a method of testing the effective value of the alternating voltage, which can extract a direct voltage representing the effective value of the alternating voltage signal from the input alternating voltage signal. This is exactly the dc signal that the analog-to-digital converter needs and can process. The power frequency alternating current is 50Hz sine wave and its expression is U ═ UpSin (ω t + Φ), whose significand is usually URMS, is solved by the following equation.
The ac voltage converter 104 of this embodiment uses an AD536 chip, and when the input voltage is greater than 100Mvrms, the 3dB bandwidth is greater than 450 KHz. The circuit structure is shown in fig. 3.
A Vin pin of the AD536 chip is connected with a Vin end through a capacitor C3, and the Vin end is connected to the output end of the DC power supply module 103; the Vs pin is respectively connected with one end of a capacitor C5 and one end of a sliding rheostat W1, and the other end of the sliding rheostat W1 is connected to the CAN pin through a capacitor C1; the other end of the capacitor C5 is grounded; the Buf-O pin is connected with the V-out end and is connected to the Iout pin through a resistor R7 and a capacitor C2 which are connected in series; the anode of the capacitor C2 is connected with a Buf-i pin of the AD536 chip; the + Vs pin of the AD536 chip is connected to the Com pin through a capacitor C4 and is grounded; the Rl pin of the AD536 chip is respectively connected with one end of a resistor R7 and one end of a resistor R8; the other end of the resistor R7 is grounded; the other end of the resistor R8 is connected to the sliding end of the sliding resistor W1.
The V _ out terminal outputs a direct current voltage, and the relationship between the direct current voltage and the effective value of the measured primary side alternating current is as follows:
V_out＝I2*R＝I1*R/Ki；
substitution of transformation coefficient KiWhen the sampling resistance is 10, 0.04 Ω, then: i is1＝V_out*Kiand/R250V _ out. For example, if the dc voltage V _ out in the circuit is 0.2V, the effective value 250V _ out of the measured current is 50A (amperes).
In other embodiments, the analog-to-digital conversion module 2 includes a reference voltage source 201 and an analog-to-digital converter 202 electrically connected; the reference voltage source 201 is used for providing a reference voltage for the analog-to-digital converter 202; the analog-to-digital converter 202 is configured to output a relative magnitude between the dynamic voltage value and the reference voltage to the single chip microcomputer 3 according to the dynamic voltage value output by the alternating current collector 102 and the reference voltage output by the reference voltage source 201.
Specifically, the circuit structure of the analog-to-digital conversion module 2 is shown in fig. 4, and includes an analog-to-digital converter U2, a reference voltage source U4, a sliding rheostat W2, capacitors C40, C41, C42, C43, C45, C46, resistors R26, R42, and R44; the Vref pin of the analog-to-digital converter U2 is connected with the sliding end of the slide rheostat W2; one end of the slide rheostat W2 is connected with one end of a reference voltage source U4, and the other end of the slide rheostat W2 is connected with the other end of the reference voltage source U4 through a capacitor C40; the other end of the reference voltage source U4 is respectively connected with a VDD pin of the analog-to-digital converter U2 and one end of a capacitor C45; the other end of the capacitor C45 is grounded; a Vx pin of the analog-to-digital converter U2 is respectively connected with one end of a capacitor C41 and one end of a resistor R26, the other end of the capacitor C41 is grounded, and the other end of the resistor R26 is connected to a power supply input end V-in; the VAG pin of the analog-to-digital converter U2 is grounded; an R1 pin (4 pins) of the analog-to-digital converter U2 is connected with one end of a resistor R42; the pin R1/C1 (pin 5) of the analog-to-digital converter U2 is connected with the other end of the resistor R42; a pin C1 (pin 6) of the analog-to-digital converter U2 is connected with the other end of the resistor R42 through a capacitor C42; the pin C01 of the analog-to-digital converter U2 is connected with the pin C02 through a capacitor C43; the CLK1 pin of the analog-to-digital converter U2 is connected with the CLK0 pin through a resistor R44; a VEE pin of the analog-to-digital converter U2 is connected with a VSS pin through a capacitor C46, and the VSS pin is grounded; the pins Q0, Q1, Q2, Q3, DS1, DS2, DS3, DS4, DOC and DU of the analog-digital converter U2 are respectively connected with corresponding pins of the single chip microcomputer.
Wherein, R44 is an oscillating resistor, and the 470K omega value makes the MC14433P chip work clock frequency about 66 KH. Selecting a reference voltage Vref of 0.2V, an integrating capacitor C42 of 0.1uf, and an integrating resistor R42 of 27K Ω corresponds to a voltage range of 0.2V. EOC and DU are in short circuit to enable the EOC and DU to be converted continuously, output pulses trigger external interrupt 0 of INT0(P3.2) pins of the single chip microcomputer, the states of DS 1-DS 4 pins are read by a P1 port of the single chip microcomputer, and thousand-bit, hundred-bit, hour-bit and single-bit BCD code data of analog-to-digital conversion results are read from Q3-Q0. If the measurement of the multi-path alternating current circuit is needed, the electronic switch circuit is only needed to be additionally arranged in front of the input end to carry out time-sharing switching measurement.
In one embodiment, the model number of the clock chip 4 is DS 1302; the ac current collector 102 is configured to collect ac current output by the ac power supply module 101 or ac current output by the ac voltage converter 104 at equal intervals according to the timing of the clock chip 4.
The specific circuit structure of the clock chip 4 is shown in fig. 5. The VCCI pin of the DS1302 chip is connected to the anode of the backup power supply E (3v), and the GND pin is connected to the cathode of the backup power supply E (3 v); the SCLK pin is connected with the P2.0 pin of the single chip; the I/O pin is connected with a P2.1 pin of the singlechip; the/RST pin is connected with a P2.2 pin of the singlechip; VCC2 is switched in +5V voltage; the X1 pin is connected to the X2 pin by an oscillator JT.
In this embodiment, the measured data needs to be collected once every minute at equal intervals within 1 year, the interval time can be completed by a programmable timer of the single chip microcomputer, the time-of-year, month and day time-division data is collected from a real-time clock, and a clock chip special for the DS1302 is adopted. And the backup power supply E (3v) ensures that the clock runs uninterruptedly when the system is powered off. The reading and writing of clock data by the single chip microcomputer are completed through SCLK, I/O and/RST three port lines.
As shown in fig. 6, the memory 5 is an SD card and is a nonvolatile memory, and the SD card has two operation modes: SD mode and SPI mode, for the convenience with STC15F4K singlechip communication, its SPI mode is adopted to this SD card, except the power, only needs to adopt SCLK, CS, DI, DO four-wire just can accomplish the read-write operation of singlechip to SD.
The connection relationship between the SD card and the single chip microcomputer 3 in this embodiment is shown in fig. 6:
the/CS pin, the Data-in pin, the CLK pin and the Data-out pin of the SD card are respectively connected with the level shifter; the Vss1 pin is grounded, and the Vcc pin is connected with 3.3v voltage; the level converter is respectively connected with SD-CS, SD-DI, SD-SCLK and SD-DO ports of the single chip microcomputer.
More advantageously, the device also comprises a display screen 7 and an LED status indicator lamp 8; the display screen 7 and the LED status indicator lamp 8 are respectively electrically connected with the singlechip 6; the display screen 7 is used for displaying time information and current information in real time. The display screen 7 adopts an LCD2002 liquid crystal display screen, can display the year, month, day and current information of the clock in real time, and is matched with the control keys to modify the clock data and modify the working parameters of the instrument.
In one embodiment, the control keys 6 are touch keys, and power node prompting can be selected from the control keys 6. According to the service time of the instrument, an operator can set important nodes for automatically reminding the maintenance time of the instrument, the replacement time of consumables of the important instrument and the like.
The control keys 6 can select the state of the instrument automatically recognized by the system or manually confirmed by the system. Manual confirmation is that according to an operation instruction on a screen, firstly ensuring that an instrument is in a shutdown state, pressing a confirmation key, recording power (current) during shutdown by a system, then ensuring that the instrument is in a standby state, pressing the confirmation key again, and recording the power of the standby state by the system; the instrument is ensured to be in a working state, the confirmation key is pressed, and the system records the instantaneous power when the work is started and the power in the work.
The utility model discloses by STC15F4K series singlechip as control core, real-time measurement and data record that use time as the index are carried out to the electric current of laboratory instrument to cooperation DS1302 real-time clock chip. If the power supply is made in three-phase four-wire, each memory record format "nnnn yy rr dd ss ffxx.x yy.y zz.zbbb bbb bbb" wherein nnnn yy rr dd ss ff is year, month, day, week, hour, minute, for example: "20191122051012" indicates 21 days 11/month, friday, and 12 minutes 10 am in 2019. And xx.x represents the current value of the phase line of the 1 st line or L1 (decimal point 1 bit). y.y represents the phase line current value for path 2 or L2 (decimal point 1 bit). z. z represents the line current value for line 3 or L3 (decimal point 1 bit). bbb bbb bbb is a reserved data bit, which reserves storage that can be extended up to 3 way (phase) voltage entries. Thus, each record has 34 bytes, and 1 year of data is recorded once, and the memory bank has at least 365 days (day/year) × 24 (hour/day) × 60 (minute/hour) × 34 (byte count/record per minute) ═ 17870400 ═ 17.8 mbytes. The capacity of a common memory card (such as a 24C series and an AT45D041 series) is difficult to achieve, and an SD card and a U disk must be considered, wherein the SD card has good universality, low price and large capacity, and can easily reach several gigabytes.
The utility model discloses can carry out real-time statistical analysis to the rate of utilization of the important instrument in laboratory to judge instrument operating condition's nature determination and quantitative index according to the record result, in order to maintain and maintain the instrument in advance, guarantee large-scale instrumentation's safe operation, and improve economic benefits.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a full-time detection device of large-scale instrument operating condition in laboratory which characterized in that includes: the device comprises an alternating current/direct current acquisition module, an analog-to-digital conversion module, a single chip microcomputer, a clock chip, a memory and control keys;
the alternating current/direct current acquisition module is electrically connected with the large laboratory instrument and is used for acquiring alternating current or direct current output by the large laboratory instrument in different running states and converting the direct current into alternating current;
the analog-to-digital conversion module is electrically connected with the alternating current/direct current acquisition module and the single chip microcomputer respectively, and is used for receiving an alternating current numerical value acquired by the alternating current/direct current acquisition module in real time and outputting the relative magnitude of the alternating current numerical value and a reference voltage;
the single chip microcomputer is electrically connected with the clock chip, the memory and the control key respectively;
the control key is used for selecting frequency nodes of the large laboratory instrument in different working states;
the single chip microcomputer is used for controlling the memory to store the alternating current numerical value in a classified mode according to the frequency node selected by the control key and the output result of the analog-to-digital conversion module.
2. The full-time detection device for the working state of the large laboratory instrument according to claim 1, wherein the alternating current/direct current acquisition module comprises an alternating current power supply module, an alternating current collector, a direct current power supply module and an alternating current voltage converter; the alternating current power supply module and the direct current power supply module are respectively electrically connected with the large laboratory equipment; the alternating current collector is electrically connected with the alternating current power supply module and is used for receiving alternating current output by the alternating current power supply module; the alternating current voltage converter is electrically connected with the direct current power supply module and the alternating current collector respectively and is used for converting direct current output by the direct current power supply module into alternating current and transmitting the converted alternating current to the alternating current collector; the alternating current collector is electrically connected with the analog-to-digital conversion module.
3. The full-time detection device for the working state of the large laboratory instrument according to claim 2, wherein the alternating current power supply module comprises a power supply lead-in wire and a distribution box; the power supply lead-in wires are electrically connected with the laboratory large-scale instrument and the distribution box respectively.
4. The full-time detection device for the working state of the large laboratory instrument according to claim 2, wherein the alternating current collector consists of a current transformer and a sampling resistor; the sampling resistor is used for carrying out I/V conversion on the alternating current induced by the current transformer.
5. The full-time detection device for the working state of the large-scale laboratory instrument according to claim 2, wherein the AC voltage converter adopts an AD536 chip.
6. The full-time detection device for the working state of the large laboratory instrument according to claim 1, wherein the analog-to-digital conversion module comprises a reference voltage source and an analog-to-digital converter which are electrically connected; the reference voltage source is used for providing reference voltage for the analog-to-digital converter; the analog-to-digital converter is used for outputting the relative size of the dynamic voltage value and the reference voltage to the single chip microcomputer according to the dynamic voltage value output by the alternating current collector and the reference voltage output by the reference voltage source.
7. The full-time detection device for the working state of the large laboratory instrument according to claim 6, wherein the reference voltage source adopts an MC1403 chip; the analog-to-digital converter adopts an MC14433P chip; the single chip microcomputer is an STC15F4K single chip microcomputer.
8. The full-time detection device for the working state of the large laboratory instrument according to claim 2, wherein the model of the clock chip is DS 1302; the alternating current collector is used for collecting alternating current output by the alternating current power supply module or alternating current output by the alternating voltage converter at equal intervals according to the timing of the clock chip.
9. The full-time detection device for the working state of the large-scale laboratory instrument according to claim 1, wherein the memory is a nonvolatile memory.
10. The full-time detection device for the working state of the large laboratory instrument according to claim 1, characterized by further comprising a display screen and an LED state indicator light; the display screen and the LED status indicator lamp are respectively electrically connected with the singlechip; the display screen is used for displaying time information and current information in real time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022699361.3U CN213780237U (en) | 2020-11-19 | 2020-11-19 | Full-time detection device for working state of large laboratory instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022699361.3U CN213780237U (en) | 2020-11-19 | 2020-11-19 | Full-time detection device for working state of large laboratory instrument |
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