Voltage sensor

1 definition editing

The voltage sensor is a detection device that can sense the information of the voltage to be measured, and can transform the information sensed by the detection according to a certain law into an electrical signal or other desired form of information output that meets certain standards, so as to meet the requirements. Information transmission, processing, storage, display, recording and control requirements.

Aliases: voltage transmitter

2 Category Editing

The voltage sensor is divided into a DC voltage sensor and an AC voltage sensor. The AC voltage sensor is a device capable of converting an AC current (AC voltage) to be measured into a DC voltage or DC current in a linear ratio, and is widely used in electricity, post and telecommunications, and petroleum. Coal, metallurgy, railway, municipal and other departments of electrical devices, automatic control and scheduling systems. AC voltage sensor has a single, three-way combination of structural forms. DC voltage sensor is a kind of instrument that can convert the DC voltage under test into DC voltage or DC current with linear proportional output. It is also widely used in electricity, remote monitoring, instrumentation, medical equipment, industrial automation, etc. industry.

According to voltage polarity

Divided into DC voltage sensors and AC voltage sensors. According to the applicable frequency range, AC voltage sensors can be divided into power frequency voltage sensors and frequency conversion voltage sensors (or broadband voltage sensors).

According to the principle of measurement

Divided into resistance divider, capacitor divider, electromagnetic voltage transformer, capacitive voltage transformer, Hall voltage sensor.

According to the output signal

Divided into analog output voltage sensor and digital output voltage sensor.

The IEC points out that it is more reasonable to convert the measured parameters into digital parameters because the analog output requirements of traditional analog output transmitters are based on limited conventional techniques and are not based on the actual use of the measured parameters. need. [1]

3 development prospects

Some sensor markets such as pressure sensors, temperature sensors, flow sensors, and level sensors have demonstrated the features of a mature market. Flow sensors, pressure sensors, and temperature sensors are the largest in the market, accounting for 21%, 19%, and 14% of the entire sensor market. The major growth in the sensor market comes from emerging sensors such as wireless sensors, MEMS (Micro-Electro-Mechanical Systems) sensors, and biosensors. Among them, the wireless sensor's compound annual growth rate in 2007-2010 is expected to exceed 25%.

The global sensor market is showing rapid growth among the ever-changing innovations. Relevant experts pointed out that the major technologies in the field of sensors will be extended and improved on an existing basis. Countries will compete to accelerate the development and industrialization of new generation sensors, and competition will become increasingly fierce. The development of new technologies will redefine the future market of sensors, such as the emergence and market share of new sensors such as wireless sensors, fiber optic sensors, smart sensors and metal oxide sensors.

4 Principle Editing

Hall principle: Hall voltage sensor is a kind of Hall effect. It uses the external or built-in resistor to limit the current to 10mA. After passing through multiple windings, the Hall voltage sensor will generate the primary current through the magnetic material. The magnetic field is detected by the Hall element in the air gap and induces the corresponding electromotive force. The electromotive force is adjusted by the circuit and fed back to the compensation coil to compensate. The magnetic flux generated by the compensation coil and the primary current (the measured voltage passes through the current limit The resistance produces) the fluxes that are equal in magnitude and in the opposite direction, thus keeping the magnetic flux in the core zero. In fact, the Hall voltage sensor uses the same technology as the magnetic balance closed-loop Hall current sensor, ie zero-flux Hall current sensor.

5 Advantages and Application Editing

Compared with traditional transformers and shunts, voltage sensors have many advantages such as high precision, fast response, good linearity, wide frequency band, high overload and no loss of measurement energy. Voltage sensors have been widely used in power, electronics, inverter devices, switching power supplies. , AC frequency control and other fields.

6 Features Edit

1. High precision: voltage sensor measurement accuracy is better than 0.01, suitable for any waveform measurement, common transformer accuracy 0.03-0.05;

2. Fast response: voltage sensor response time is less than 1 microsecond (1000000μs = 1s), ordinary transformer response time is 10-20 milliseconds (1000ms = 1s)

3. Wide range: The voltage sensor can be used for arbitrary waveform voltage and current (DC, AC, pulse, etc.), even transient peak voltage and current.

Traditional transformers are inductive components that influence signal waveforms and sinusoidal waveforms (SINE WAVE) during measurement.

4. Frequency Bandwidth: Voltage Sensor 0-100KHz, Normal Transformer 50Hz

5. High reliability: long time without failure

6. Good linearity: better than 0.002

7. Strong overload, large range: 0-tens of thousands of Amps

8. Small size, light weight, easy to install.

7 main functions and features edit

* Convert the measured DC voltage isolation into a single standard DC voltage or DC current output in linear proportion;

* Low power consumption and high reliability

* Excellent anti-interference ability and high accuracy (0.2%);

* Voltage pin input, PCB board installation;

* Widely used in various industrial voltage online isolation detection systems;

* Small size, appearance size (mm): 44 (L) × 28 (W) × 41 (H);

8 Notes Editing

* Pay attention to the auxiliary power supply information on the product label. The auxiliary power supply level and polarity of the transmitter cannot be connected wrongly, otherwise the transmitter will be damaged.
* The transmitter is an integrated structure that cannot be disassembled and should avoid collisions and falls.
* When the transmitter is used in an environment with strong magnetic interference, please pay attention to the shielding of the input line and the output signal should be as short as possible. When centralized installation, the minimum installation interval should not be less than 10mm;

* No lightning protection circuit is set inside this series of transmitters. When the transmitter input and output feeders are exposed to outdoor harsh climate environment, lightning protection measures should be taken.

* This product is packaged in a flame-retardant ABS plastic case. The ultimate withstand temperature of the case is +85°C. When it is subjected to high-temperature baking, it will be deformed, affecting product performance. Do not use or store the product near a heat source. Do not put the product in a hot box to bake it.

* Do not damage or modify the product's label, logo, do not disassemble or modify the transmitter, otherwise the company will no longer provide "three guarantees" (replacement, refund, repair) service.