CN219625576U - Alternating current signal source generating device for cable detection - Google Patents
Alternating current signal source generating device for cable detection Download PDFInfo
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- CN219625576U CN219625576U CN202321171023.XU CN202321171023U CN219625576U CN 219625576 U CN219625576 U CN 219625576U CN 202321171023 U CN202321171023 U CN 202321171023U CN 219625576 U CN219625576 U CN 219625576U
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model discloses an alternating current signal source generating device for cable detection, which comprises a power supply module, an MCU controller, an operational amplifier control module, an operational amplifier feedback module, a positive-brown wave generating circuit, a voltage-controlled amplifying module, a transformer amplifying module and a power amplifying and band-pass filtering module. The DC voltage control is adopted, so that the control is convenient and accurate, finer control can be realized, and the test precision and reliability are further improved. The method has higher practicability and application value, and is suitable for the fields of cable testing, resistance testing and the like.
Description
Technical Field
The present utility model relates to a cable detecting device, and more particularly, to an ac signal source generating device for cable detection.
Background
In the prior art, one of the cable detection devices is: firstly, calculating the voltages of a designated number of static points in a single period of the alternating current corresponding voltage to be generated by using a singlechip, and then circularly outputting corresponding analog signals by using modules such as DAC DMA TIMER and the like of the singlechip according to the amplitudes calculated by signal sampling points at different voltages. And finally, the analog signal is amplified by an operational amplifier or a triode and then is sent into a transformer to realize inversion into high-voltage alternating current, and then is provided for the primary side of the transformer, and the secondary side of the transformer obtains the high-voltage alternating current signal which is wanted by the user. The second cable detection device is as follows: the method comprises the steps of firstly calculating SPWM duty ratio data of a designated number of static points in a single period of alternating current corresponding voltage to be generated by using a singlechip, and then circularly outputting SPWM pulse signals with fixed frequency and different duty ratios by using a TIMER module of the singlechip according to the SPWM duty ratio data calculated by signal voltages generated during different voltages. Finally, the SPWM pulse signal is amplified by logic processing and other driving chips, is sent to an MOS tube bridge, is processed and filtered by using a resistor-capacitor-inductor component and the like to be sent to a primary side of a transformer needing an alternating current signal, and a secondary side of the transformer needing the alternating current signal to obtain a high-voltage alternating current signal wanted by the user;
the scheme one is that the analog circuit is used for amplification and various losses of the transformer, so that the output signal has larger distortion and amplitude instability, complicated manual calibration is needed, and the stability of the signal is poor; the second scheme requires higher hardware cost, is complex in manual calibration of the output signal, and requires higher technical level in circuit design.
Disclosure of Invention
The utility model aims to provide an alternating current signal source generating device for cable detection. A stable and reliable high-voltage signal source is provided for the cable detection system, and the output voltage of the transformer is regulated in real time in a real-time feedback mode at the output high-voltage signal and the input end, so that the stability of the system in different environments is realized.
In order to achieve the above purpose, the utility model is implemented according to the following technical scheme:
the utility model comprises a power supply module, an MCU controller, an operational amplifier control module, an operational amplifier feedback module, a positive-brown wave generating circuit, a voltage-controlled amplifier module, a transformer amplifier module and a power amplifying and band-pass filter module, wherein the power supply output end of the power supply module is respectively connected with the MCU controller, the operational amplifier control module, the operational amplifier feedback module, the positive-brown wave generating circuit, the voltage-controlled amplifier module, the transformer amplifier module and the power amplifying and band-pass filter module, the control signal output end of the MCU controller is connected with the control signal input end of the operational amplifier control module, the control signal output end of the operational amplifier control module is connected with the transformer amplifier module sequentially through the voltage-controlled amplifier module and the power amplifying and band-pass filter module, the power output end of the transformer amplifier module is connected with the high-voltage output port, the signal output end of the positive-brown wave generating circuit is connected with the signal input end of the voltage-controlled amplifier module, and the signal feedback output end of the high-voltage output port is connected with the feedback signal input end of the operational amplifier control module through the operational amplifier feedback module.
Preferably, the model of the operational amplifier control module is MAX44248 high-speed zero-drift operational amplifier chip. The MCU controller adopts a model STM32F103RCT6 chip.
The high-voltage alternating current generating device for cable test adopts a feedback principle, specifically, a high-voltage end is fed back to a control loop through resistor voltage division, a stable DC voltage signal is provided by a singlechip DAC or a DAC chip and is output to the control loop, and then a positive-wave AC high-voltage signal is regulated and output in real time through a operational amplifier, a voltage control element, a transformer and other hardware circuits in the feedback loop.
Specifically, the signal of the high voltage end is fed back to the non-feedback end of the operational amplifier feedback module through resistor voltage division, and the signal and the feedback end of the operational amplifier feedback module are connected together. And the output signal of the operational amplifier feedback mode is subjected to power amplification through a triode, a field effect transistor and the like, and then is subjected to boosting treatment through a transformer amplifying module. The amplified signal is controlled by the voltage-controlled amplifying module and the operational amplifier control module, so that the output voltage can be effectively regulated. Through resistor voltage division feedback, the output voltage can be accurately regulated, so that high-precision cable test is realized.
Meanwhile, the control part of the utility model adopts a singlechip DAC or DAC chip to provide a stable DC voltage signal to output to the control loop, and the waveform of the output alternating current AC is generated by the positive-brown wave resonant circuit and output to the positive and negative input ends of the voltage-controlled operational amplifier, thereby ensuring the integrity of the waveform of the output positive-brown AC voltage. Meanwhile, the output voltage can be quickly and accurately adjusted, and the testing precision and reliability are improved.
The beneficial effects of the utility model are as follows:
compared with the prior art, the alternating current signal source generating device for cable detection has stable output voltage, can effectively inhibit the influence of various factors on the external environment and circuits, and improves the test precision and reliability. The DC voltage control is adopted, so that the control is convenient and accurate, finer control can be realized, and the test precision and reliability are further improved. The method has higher practicability and application value, and is suitable for the fields of cable testing, resistance testing and the like.
Drawings
Fig. 1 is a schematic block diagram of the structure of the present utility model.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the utility model are for purposes of illustration, but are not intended to be limiting.
As shown in fig. 1: the utility model comprises a power supply module, an MCU controller, an operational amplifier control module, an operational amplifier feedback module, a positive-brown wave generating circuit, a voltage-controlled amplifier module, a transformer amplifier module and a power amplifying and band-pass filter module, wherein the power supply output end of the power supply module is respectively connected with the MCU controller, the operational amplifier control module, the operational amplifier feedback module, the positive-brown wave generating circuit, the voltage-controlled amplifier module, the transformer amplifier module and the power amplifying and band-pass filter module, the control signal output end of the MCU controller is connected with the control signal input end of the operational amplifier control module, the control signal output end of the operational amplifier control module is connected with the transformer amplifier module sequentially through the voltage-controlled amplifier module and the power amplifying and band-pass filter module, the power output end of the transformer amplifier module is connected with the high-voltage output port, the signal output end of the positive-brown wave generating circuit is connected with the signal input end of the voltage-controlled amplifier module, and the signal feedback output end of the high-voltage output port is connected with the feedback signal input end of the operational amplifier control module through the operational amplifier feedback module.
The high-voltage alternating current signal source is designed based on a voltage-controlled AC design scheme with feedback, and consists of 8 parts in total, wherein a power amplifying part and a transformer amplify. All parts enable the system to work and control the state in a closed loop through feedback, and finally stable and accurate high-voltage output is realized.
The hardware components employed therein are described as follows:
the operational amplifier feedback module is a high gain, differential input, single ended output electronic amplifier. In the utility model, the operational amplifier feedback module is used for processing the feedback signal to realize the stability and the adjustability of the voltage output, and in order to ensure the voltage adjustment precision and the corresponding speed, a high-speed zero drift operational amplifier MAX44248 is adopted.
The power module supplies electric energy to all the partial circuits, and ensures the normal operation of the system. In the present utility model, 3 voltage types are used as follows:
the DC15V power supply mainly provides an operational amplifier control module and an operational amplifier feedback module as input;
the DC5V power supply mainly provides power for the voltage-controlled amplifying module;
the DC3.3V power supply is mainly supplied to the MCU controller, the positive-brown wave generating circuit, the transformer amplifying module and the power amplifying and band-pass filtering module.
The voltage-controlled amplifying module is a component for controlling the gain of the operational amplifier through DC voltage, and the gain of the operational amplifier input to the output can be controlled through changing the voltage. In the utility model, the voltage-controlled amplifying module selects a VCA821 as a chip for controlling the output size and stability of the high-voltage alternating voltage, and can be replaced by a four-quadrant multiplier in practical use.
A transformer amplification module is an electronic device for transforming voltage or current. In the utility model, the transformer amplifying module is used for improving the output efficiency and stability of the high-voltage alternating voltage.
The MCU controller is mainly controlled by DAC output program control voltage to output alternating voltage. The self-contained DAC chip, such as STM32F103RCT6 chip, can be used in a practical circuit, or a general MCU+DAC chip scheme can be used, or SPWM filtering is generated to generate program control voltages.
A positive brown wave generation circuit:
(1) the cost is high, the frequency and the waveform can be freely adjusted by adopting the special DDS chip.
DDS (Direct Digital Synthesis) is a frequency synthesis technique implemented using digital signal processing techniques that can be implemented to produce signals of different frequencies and waveforms by adjusting the phase, frequency, and amplitude of the digital signal. When generating sine wave signals, the DDS chip can achieve very high precision and stability, has flexible control capability, and can freely adjust the frequency and waveform of output signals. However, the cost is relatively high because of the need to use a dedicated chip.
(2) The sine wave generating circuit is adopted, the cost is low, the frequency is low, and the waveform is not freely adjustable.
The positive sine wave generating circuit is a circuit design based on an integrated circuit, and can realize the generation of sine wave signals through basic circuit element (such as capacitance, inductance, transistor and the like) combination. Compared with the DDS chip, the circuit has lower cost, but the precision and stability of the generated sine wave signal may be inferior to those of the DDS chip, and the frequency and waveform of the signal cannot be freely adjusted.
In summary, if a high-precision sine wave signal needs to be generated, the DDS chip is a better choice, but the cost is higher; the sine wave generation circuit is also a viable solution if the accuracy requirements are not high and the cost is limited.
6) Power part:
(1) special audio power amplifying chip
The scheme adopts a special audio power amplifying chip, and the circuit structure is simpler. Since the output power of the chip is fixed, the output power of the chip is not adjustable, and the chip is generally suitable for some audio amplification applications with smaller power requirements, such as small sound boxes, earphone amplifiers and the like.
The scheme has the advantages of simple circuit structure, convenient use and lower cost. The disadvantages are that the power output is fixed and not adjustable, and the chip type is limited, which is not flexible enough.
(2) Adopts the scheme of operational amplifier and triode current expansion
The scheme adopts the operational amplifier as a pre-stage amplification, and then the power output adjustability is realized through the current expansion amplification of the triode. The circuit structure is relatively complex and needs to be designed according to specific requirements.
The scheme has the advantages that the power output can be adjusted according to actual requirements, and the flexibility is high. The disadvantage is that the circuit structure is relatively complex and the effort required for design and debugging is large.
In general, both schemes have a scenario in which they are applicable. If the demand is relatively simple and the power output does not need to be excessive, a special audio power amplifying chip can be selected. If more flexible power output adjustment is required, an op-amp + triode current spreading scheme may be employed.
The utility model adopts hardware feedback, has high system stability, can effectively inhibit the influence of various factors on the external environment and the circuit, and improves the test precision and reliability.
The utility model adopts DC voltage control, is convenient and accurate to control, can realize finer control, and further improves the test precision and reliability.
The utility model adopts the operational amplifier comparison circuit, the voltage-controlled operational amplifier adjustment, the positive-and-negative wave resonant circuit, the transformer and other hardware circuits, and has the advantages of simple structure, convenient use and the like.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be appreciated by those skilled in the art that the present utility model is not limited by the foregoing embodiments, which are described in the specification merely illustrative of the principles of the present utility model, without departing from the spirit and scope of the utility model
The utility model is susceptible to various changes and modifications, all of which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (3)
1. An alternating current signal source generating device for cable detection, which is characterized in that: the power supply comprises a power supply module, an MCU controller, an operational amplifier control module, an operational amplifier feedback module, a positive brown wave generating circuit, a voltage-controlled amplifier module, a transformer amplifier module, a power amplifier and a band-pass filter module, wherein the power supply output end of the power supply module is respectively connected with the MCU controller, the operational amplifier control module, the operational amplifier feedback module, the positive brown wave generating circuit, the voltage-controlled amplifier module, the transformer amplifier module, the power amplifier and the power input end of the band-pass filter module, the control signal output end of the MCU controller is connected with the control signal input end of the operational amplifier control module, the control signal output end of the operational amplifier control module sequentially passes through the voltage-controlled amplifier module, the power amplifier and the band-pass filter module are connected with the transformer amplifier module, the power output end of the transformer amplifier module is connected with the signal input end of the voltage-controlled amplifier module, and the signal feedback output end of the high voltage output port is connected with the feedback signal input end of the operational amplifier control module.
2. The alternating current signal source generating device for cable detection as claimed in claim 1, wherein: the model of the operational amplifier control module is MAX44248 high-speed zero drift operational amplifier chip.
3. The alternating current signal source generating device for cable detection as claimed in claim 1, wherein: the MCU controller adopts a model STM32F103RCT6 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321171023.XU CN219625576U (en) | 2023-05-16 | 2023-05-16 | Alternating current signal source generating device for cable detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321171023.XU CN219625576U (en) | 2023-05-16 | 2023-05-16 | Alternating current signal source generating device for cable detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219625576U true CN219625576U (en) | 2023-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321171023.XU Active CN219625576U (en) | 2023-05-16 | 2023-05-16 | Alternating current signal source generating device for cable detection |
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| Country | Link |
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| CN (1) | CN219625576U (en) |
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2023
- 2023-05-16 CN CN202321171023.XU patent/CN219625576U/en active Active
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