First of all, to determine the basic technical parameters, such as:
1, the size of the measured current value
2, the size of the measured cable or converging copper plate (according to the size of the selection of the product's perforation size, try to fill the perforation)
3, the output signal (the voltage output type is generally ± 4V or ± 5V; the current output type is generally a lot of types)
4, the power supply (generally DC ± 12-15V, DC +5V, DC3.3V) 5, whether or not the PCB installation to pay attention to the pin size, etc. Nanjing Token electronic current sensor variety covers all of the above parameters. Power supply (generally DC ±12-15V, DC +5V, DC3.3V)
5, whether the PCB installation should pay attention to the pin size, etc. Nanjing Token electronic current sensors a complete range, covering all the above parameters. Usually open-loop products to TKC start more voltage output type; closed-loop products to TBC start more current output type, but our full PCB installation of closed-loop current sensors can be done to voltage output type, which is our unique invention patents.
6, rail-type, but fewer varieties of the above are the main technical parameters.
The other sub-technical parameters are as follows:
1, the use of the environment whether there is High and low temperatures, strong vibration, humidity and other requirements
2, for the accuracy of whether there are requirements (generally closed-loop current sensors more than 0.1-1% varies, open-loop sensor accuracy is more than 1%) Nanjing Token electronic high-precision current sensors can be done without positional error, the real 0.1% accuracy Reasonable selection of Hall current sensors, that is, according to the actual needs and the possibility of targeting, to do so.
To understand the characteristics of the measured: such as one is the state of the measured, the nature of the measurement, the measurement of the range, amplitude and frequency band, the measurement of the speed, time, accuracy requirements, the magnitude of the overload and and the frequency of occurrence and so on. The second is to understand the conditions of use, which consists of two aspects: (1) the site environmental conditions: such as temperature, humidity, air pressure, energy, light, dust and dirt, vibration, noise, electromagnetic fields and radiation interference, etc.; (2) the existing basic conditions: such as financial resources (affordability), material resources (ancillary facilities), manpower (technical level) and so on. Selection of Hall current sensors need to consider many aspects and matters, in practice, it is not possible or necessary to meet all the requirements. Designers should start from the overall system of Hall current sensor use of purpose, requirements, comprehensive analysis of the main and secondary, weighing the pros and cons, to seize the important aspects, highlighting the important matters to be prioritized. On this basis it can be clear that the choice of Hall current sensor type of specific issues: the size of the range and overload; the measured object or location of the Hall current sensor weight and volume requirements; the measurement of the way is non-contact (isolation) measurement.
The following is another introduction to the principle of Hall current sensor: Hall current sensor is the use of the Hall effect principle of the primary large current will be converted into a secondary tiny voltage or small current signal of the electrical measurement sensor. The actual design of Hall power (voltage, current) sensors are often through operational amplifiers and other circuits, the weak voltage signal is amplified into a standard voltage or current signal. Before selecting, need to be associated with the Hall current sensor work of all aspects of the research and study.
To understand the characteristics of the measured: such as the state of being measured, the nature of the measurement of the range, amplitude and frequency band, the measurement of the speed, time, accuracy requirements, the magnitude of the overload and and the frequency of occurrence and so on.
1. Wide measurement range: it can measure the current and voltage of any waveform, such as DC, AC, pulse, triangular waveforms, etc., and even the transient peak current and voltage signals can be faithfully reflected;
2. Fast response speed: the fastest response time is less than 1us.
3. High measurement accuracy: its measurement accuracy is better than 1%, which is suitable for the measurement of any waveforms. Ordinary transformers are inductive components, access to affect the measured signal waveform, its general accuracy of 3% to 5%, and is only suitable for 50Hz sinusoidal waveform.
4. Good linearity: better than 0.1%
5. Good dynamic performance: fast response time, can be less than 1 us; ordinary transformer response time of 10-20ms.
6. Wide operating band: in the 0 ~ 100KHz frequency range of signals can be measured.
7. High reliability, long average trouble-free working time: the average time of > 10000 hours of trouble-free.
8. Strong overload capacity, measurement range Large: 0 --- tens of amperes ~ tens of thousands of amperes.
9. Small size, light weight, easy to install.
Hall current and voltage sensors due to the advantages of the above, so it can be widely used with frequency control devices, inverter devices, UPS power supply, inverter welder, electrolysis plating, CNC machine tools, microcomputer monitoring systems, grid monitoring systems and the need to isolate the current and voltage detection of a variety of industrial control fields.
