Hall Measurement AC 0-3500A/3000A/4000A/4500A Sensor Transmitter Module Current Detection | Электронные компоненты и

Hall Measurement AC 0-3500A/3000A/4000A/4500A Sensor Transmitter Module Current Detection | Электронные компоненты и

The principle of Hall measurement AC 0-3500A/3000A/4000A/4500A sensor transducer module current detection: the flux generated by IP current of the original side is gathered in the magnetic circuit by high-quality magnetic cores, the Hall element is fixed in a small air gap, and the flux is detected linearly. The Hall voltage output by Hall device is processed by special circuit, and the output voltage of the secondary side is the same as that of the original side. This voltage can accurately reflect the change of primary current. A Hall current sensor can measure all kinds of current, from direct current to tens of kilohertz AC current. Its working principle is mainly Hall effect B. When the primary wire passes through the current sensor, the IP of primary current will produce magnetic lines, the IP of primary current will concentrate around the core, and the built-in magnetic cores. Hall electrodes in the air gap can generate a voltage of only a few millivolts proportional to the original magnetic force line. Fourthly, electronic circuits can transform this tiny signal into a secondary side current IS. There are the following relations: (c) When the original side current IP flows through a long wire, a magnetic field will be generated around the wire. The magnitude of the magnetic field is proportional to the current flowing through the wire, and the generated magnetic field will be directly proportional to the current flowing through the wire. The field is gathered in the magnetic ring and measured by Hall element in the air gap of the magnetic ring. The output voltage VS accurately reflects the original current IP. General rated output is rated at 4V. Hall Measurement AC 0-3500A/3000A/4000A/4500A Sensor Transmitter Module Current Detection Advantages 1. The measurement range is wide: it can measure the current and voltage of arbitrary waveform, such as DC, AC, pulse, triangular waveform, etc., and can faithfully reflect the transient peak current and voltage signals. 2. Fast response speed: the fastest response time is only 1us. 3. High measurement accuracy: its measurement accuracy is better than 1%, which is suitable for any waveform measurement. Common transformer is an inductive component, which affects the measured signal waveform after being connected. Its general accuracy is 3%~5%, and it is only suitable for 50Hz sinusoidal waveform. 4. Good linearity: better than 0.2% 5. Good dynamic performance: fast response time, can be less than 1 us; ordinary transformer response time is 10-20 Ms. 6. Working frequency bandwidth: Signals in the frequency range of 0-100KHz can be measured. 7. High reliability, long average trouble-free working time: average trouble-free time > 510 hours 8. Strong overload capability and wide measurement range: 0-tens of amperes to tens of thousands Amperes 9. Small size, light weight and easy installation. Hall sensor can be widely used with frequency conversion speed control device, inverter device, UPS power supply, inverter welding machine, electroplating, numerical control machine tool, computer monitoring system, power grid monitoring system and all aspects of current and voltage need to be isolated detection, including power, body control, traction control and anti-lock braking system. It can be used to measure, control and protect DC high current in aluminium smelting, chlor-alkali smelting and non-ferrous metal smelting industries. The measuring range of current can be 500KA. It has high precision and wide working temperature range. Current sensors have their own technical types because of different manufacturers. When choosing current sensors, we should mainly choose the current, accuracy and bandwidth equivalents. There are many manufacturers of current sensors and many foreign brands. I use LEM. It feels good. It's normal after sale. Technical support is good. D Current Inductors: Circuits that monitor current by measuring the voltage drop on the resistance placed on the current path (although there are other techniques, such as magnetic correlation techniques, the discussion here is limited to parallel resistance current measurements). (See Figure 1) The current sensor outputs a voltage or current Hall current sensor proportional to the current passing through the measurement path, which has the following advantages: 1. Hall sensor can measure the current and voltage of arbitrary waveform, such as DC, AC, pulse waveform, and even the transient peak value. The secondary current faithfully reflects the waveform of the primary current. The common transformer can not be compared with it. It is generally only suitable for measuring 50Hz sinusoidal wave. 2. There is good electrical isolation between the primary circuit and the secondary circuit, and the isolation voltage can reach 9600 Vrms. 3. High accuracy: In the working temperature range, the accuracy is better than 1%, which is suitable for any waveform measurement. 4. Good linearity: better than 0.1%; 5. Broadband width: The rise time of current sensor with high bandwidth can be less than 1 us; however, the bandwidth of voltage sensor is narrower, generally within 15 kHz, and the rise time of 6400 Vrms high voltage sensor is about 500 uS, and the bandwidth is about 700 Hz. 6. Measurement Range: Hall sensor is a series of products. Current measurement can reach 50KA and voltage measurement can reach 6400V. When using B Hall current sensor, the following precautions should be followed: Hall measurement AC 0-3500A/3000A/4000A/4500A sensor transducer module current detection 1. In order to obtain better dynamic characteristics and sensitivity, it is necessary to pay attention to the coupling of primary and secondary coils. To achieve good coupling, it is better to use a single conductor and the conductor is fully filled with the aperture of Hall sensor module. 2. In use, when large DC current flows through the primary coil of the sensor and the secondary circuit is not connected to the power supply | regulator or the secondary side open circuit, the magnetic circuit will be magnetized, resulting in remanence, which will affect the measurement accuracy (so the power supply and the measurement end M should be connected before using). When this happens, demagnetization should be carried out first. The method is that the secondary circuit is not powered, but in the primary coil.