CN204705703U - The motor detection circuit of CCTV camera - Google Patents
The motor detection circuit of CCTV camera Download PDFInfo
- Publication number
- CN204705703U CN204705703U CN201520467317.6U CN201520467317U CN204705703U CN 204705703 U CN204705703 U CN 204705703U CN 201520467317 U CN201520467317 U CN 201520467317U CN 204705703 U CN204705703 U CN 204705703U
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- motor
- triode
- detection circuit
- resistance
- cctv camera
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Abstract
A motor detection circuit for CCTV camera, carry out modulus sampling, and sampled result when normally being run by motor is as reference standard, shows motor rotation blockage when the relatively above-mentioned reference standard of sampled result changes to the driving voltage feedback of motor.The utility model based on motor normal run and stall time the inconsistent principle of Voltage Feedback waveform, by carrying out real-time sampling and contrast mutually to one group of coil drive Voltage Feedback, judge whether the run location of motor arrives mechanical end points, detection means is not added in mechanism, thus simplify the line of device interior, optimize the structural design of video camera, make entire system more succinct, reliability is corresponding improve also.
Description
Technical field
The utility model relates to the technical field of video monitoring, is the motor detection circuit of the CCTV camera that a kind of structure is simple, reliability is higher specifically.
Background technology
Safety monitoring front-end product mainly comprises several large classes such as intelligent spherical camera, intelligent console video camera, gun shaped video camera, dome-type camera.Wherein spherical camera, monopod video camera etc. are driven by motor by control program, automatically regulate the view directions of video camera in the horizontal direction with vertical direction.Motor all has a fixing driving angle usually, namely driven video camera is merely able to rotate in fixing angle, motor drives the extreme position turned over to be defined as physical construction end points, when motor goes to its physical construction end points, i.e. motor rotation blockage, electric current now in motor can reach many times during running status, easy motor damage.Simultaneously for the main control unit of Electric Machine Control, i.e. MCU, also the conversion carrying out control strategy in video camera runs according to motor-driven position is needed, so need to judge motor operation position, common way goes out to install additional the detection means such as slot optical coupling, microswitch and Hall element at the physical construction end points of motor, but above-mentioned existing detection mode all needs to increase extra device, thus adds interconnector, the also corresponding design complexities increasing device structure.
Utility model content
The technical problems to be solved in the utility model is to provide the motor detection circuit of the CCTV camera that a kind of structure is simple, reliability is higher.
The technical scheme that the utility model is taked for the technical matters existed in solution known technology is:
The motor detection circuit of CCTV camera of the present utility model, in motor, one end of one group of coil is connected with power supply, the other end of this group coil is connected with the collector of triode, the universal input/output interface controlling the MCU of motor rotation is connected with the base stage of above-mentioned triode, between universal input/output interface and base stage, base resistance is set, the grounded emitter of triode, the circuit of the first resistance and the second resistance is had at the collector and emitter two ends of triode parallel connection string, the circuit be connected with the analog to digital converter of MCU is drawn between the first resistance and the second resistance.
Described triode is NPN type triode.
The advantage that the utility model has and good effect are:
In the motor detection circuit of CCTV camera of the present utility model, based on motor normal run and stall time the inconsistent principle of Voltage Feedback waveform, by carrying out real-time sampling and contrast mutually to one group of coil drive Voltage Feedback, judge whether the run location of motor arrives mechanical end points, in mechanism, do not add detection means, thus simplify the line of device interior, optimize the structural design of video camera, make entire system more succinct, reliability is corresponding improve also.
Accompanying drawing explanation
Fig. 1 is the feedback voltage waveform schematic diagram utilizing the motor detection circuit of CCTV camera of the present utility model to collect when motor normally runs;
Fig. 2 is the feedback voltage waveform schematic diagram utilizing the motor detection circuit of CCTV camera of the present utility model to collect when motor rotation blockage;
Fig. 3 is the schematic diagram of the motor detection circuit of CCTV camera of the present utility model.
Embodiment
Referring to drawings and Examples, the utility model is described in detail.
What in Fig. 1 and Fig. 2, the first half of each waveform schematic diagram was corresponding is by the universal input/output interface of MCU, be called for short GPIO, the voltage waveform collected, and the latter half corresponding be by the analog to digital converter of MCU, be called for short ADC, the voltage waveform collected, waveform when waveform when comparison diagram 1 motor normally works and Fig. 2 motor rotation blockage, can find out that the waveform at ADC place is different at the waveform of two kinds of location statuss, otherwise also can be shown by the comparison of wave shape collected whether motor arrives mechanical mechanism end points.X direction corresponding time in oscillogram, and y direction corresponding voltage.
The utility model is by carrying out modulus sampling to the driving voltage feedback of motor, and sampled result when normally being run by motor is as reference standard, shows motor rotation blockage when the relatively above-mentioned reference standard of sampled result changes.
Modulus sampling is carried out with the circuit that analog to digital converter ADC is connected respectively to the IO interface GPIO of MCU, and Voltage Feedback when normally running with motor on analog to digital converter is sampled as reference standard, the real-time Voltage Feedback sampling by analog to digital converter collects is contrasted with this reference standard.By comparison diagram 1 and Fig. 2 known, when motor runs well, ADC terminal voltage waveform is strict cycle model, and during motor rotation blockage, because irregular vibrations occur motor internal rotor, and the mutual inductance effect between coil, by carrying out AD sampling to coil feedback voltage in real time, ADC terminal voltage waveform generation significant change, more just can detect whether motor moves to machinery end.
Fig. 3 is the schematic diagram of the motor detection circuit of CCTV camera of the present utility model.
As shown in Figure 3, the motor detection circuit of CCTV camera of the present utility model, in motor, one end of one group of coil L1 is connected with power Vcc, the other end of this group coil is connected with the collector of triode Q1, the universal input/output interface GPIO controlling the MCU of motor rotation is connected with the base stage of above-mentioned triode, base resistance R3 is set between universal input/output interface and base stage, the grounded emitter of triode, the circuit of the first resistance R1 and the second resistance R2 is had at the collector and emitter two ends of triode parallel connection string, the circuit be connected with the analog to digital converter ADC of MCU is drawn between the first resistance and the second resistance.Triode is NPN type triode.
The above, it is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, although the utility model with preferred embodiment openly as above, but, and be not used to limit the utility model, any those skilled in the art, do not departing within the scope of technical solutions of the utility model, certainly the technology contents of announcement can be utilized to make a little change or modification, become the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solutions of the utility model, according to any simple modification that technical spirit of the present utility model is done above embodiment, equivalent variations and modification, all belong in the scope of technical solutions of the utility model.
Claims (2)
1. the motor detection circuit of a CCTV camera, it is characterized in that: in motor, one end of one group of coil is connected with power supply, the other end of this group coil is connected with the collector of triode, the universal input/output interface controlling the MCU of motor rotation is connected with the base stage of above-mentioned triode, between universal input/output interface and base stage, base resistance is set, the grounded emitter of triode, the circuit of the first resistance and the second resistance is had at the collector and emitter two ends of triode parallel connection string, the circuit be connected with the analog to digital converter of MCU is drawn between the first resistance and the second resistance.
2. the motor detection circuit of CCTV camera according to claim 1, is characterized in that: described triode is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520467317.6U CN204705703U (en) | 2015-07-02 | 2015-07-02 | The motor detection circuit of CCTV camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520467317.6U CN204705703U (en) | 2015-07-02 | 2015-07-02 | The motor detection circuit of CCTV camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204705703U true CN204705703U (en) | 2015-10-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520467317.6U Expired - Fee Related CN204705703U (en) | 2015-07-02 | 2015-07-02 | The motor detection circuit of CCTV camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204705703U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109917288A (en) * | 2019-04-01 | 2019-06-21 | 常州市康迪克至精电机有限公司 | A kind of detection method of motor rotation blockage |
-
2015
- 2015-07-02 CN CN201520467317.6U patent/CN204705703U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109917288A (en) * | 2019-04-01 | 2019-06-21 | 常州市康迪克至精电机有限公司 | A kind of detection method of motor rotation blockage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151014 Termination date: 20190702 |