Although the communication power supply serves as the key infrastructure of the entire communication network, the communication power supply accounts for a small proportion in the entire communication industry. The purchase of power supply products by telecommunications operators is mainly annual equipment maintenance and system design, in which the maintenance of power supply equipment usually accounts for a higher proportion of the purchase volume. Telecom operators spend relatively little on the construction of power supply systems each year. Unless the telecommunications system needs to be upgraded or expanded on a large scale, operators will increase the amount of power equipment purchased It uses DC-AC-DC conversion to efficiently generate one or more stable DC voltages or currents. The current detection and overcurrent protection circuit must also be set in the communication power supply, and its action is required to be sensitive, fast and reliable. The detected current in the communication power supply has both DC and AC. If the resistance is sampled directly to detect the large power loss, and the input and output are not isolated, the current transformer can only detect AC. JCE30-XP current sensor can overcome the above shortcomings, it is suitable for current detection and overcurrent protection of communication power supply, and can work normally under low temperature conditions, low temperature drift 2. The principle and characteristics of the current sensor The Hall principle current sensor is based on the two basic principles of Hall magnetic balance principle (closed loop) and Hall direct measurement (open loop). The two principle forms are as follows: Calculation formula: the magnetic flux generated by the primary current IP is gathered in the magnetic circuit by a high-quality magnetic core, the Hall element is fixed in a small air gap, the magnetic flux is linearly detected, and the Hall voltage output by the Hall device passes After being processed by a special circuit, the secondary side output follows the output voltage that is consistent with the primary waveform, and this voltage can accurately reflect the change of the primary current. 3. How to use The core part of the DC-AC-DC conversion circuit of the switching power supply is the DC-AC inverter circuit, but it is often subject to various interference or load failures to cause overcurrent or short circuit. In order to prevent damage caused by overcurrent or short circuit, it must be equipped with overcurrent protection Circuit, when overcurrent or short circuit occurs, timely detect and block the drive signal of the power switch tube in the DC-AC inverter circuit of the switching power supply through the overcurrent protection circuit, turn off the power switch tube, thus stopping the inverter circuit Work to cut off the fault. When the current is detected by the JCE30-XP current sensor, its placement position is determined by the current flow path when a fault occurs, which is relatively simple for an inverter circuit composed of a single switch tube. As long as the monitored current is abnormal, it can be judged whether the inverter bridge is faulty, because the short circuit energy mainly comes from the discharge of the capacitor, usually two current sensors are used to monitor, two bridge arms, when overcurrent or short circuit occurs, the detection circuit output The level is higher than the threshold level, so the comparator output high level is added to the overcurrent protection point of the PWM controller of the power switch tube in the inverter circuit, the PWM pulse output is blocked, and the full-bridge converter stops working 4. Main technical indicators Rated measuring current IPN: 3 5 10 15 20 25 50 A Measuring range IP: ± 9 15 30 45 60 70 150 A Rated measurement output VM: 4V Power supply voltage (± 5%): ± 12V ~ ± 15V Current consumption IC: ≤15mA Accuracy X: —Accuracy XG (@ VPN, TA = + 25 ℃): ± 1% —Nonlinearity εL (@VPN, TA = + 25 ℃): ± 1% —Zero offset VO: ≤ ± 40mV (@ + 25 ℃) —Temperature offset VOT: ≤ ± 1.5mV / K —Response time tr (@ 90% of VP max): ≤3us —Working frequency f: DC-50KHz Withstand voltage Vd: Withstand voltage between primary side circuit and secondary side circuit: 3kV / 50Hz / 1min Working temperature TA: -25ºC ~ + 85ºC Storage temperature TS: -25 ºC ~ + 85ºC Load resistance (@IPN):> 10KΩ Weight m: 8g × (1 ± 10%) Standard: EN50178 5. Conclusion The above describes the basic characteristics and applications of Hall current sensors. Through the detection of the current in the circuit by the Hall current sensor in the communication power supply, the stability of the communication power supply can be increased. JCE30-XP can measure AC, DC, pulse, High-frequency current, based on the above basic characteristics, the product can be used in high-end products such as power supply, electroplating, power electronics, photovoltaic, inverter, inverter and so on. Curtain Rod Aluminum Finial,Aluminum Curtain Rod,Aluminium Curtain Rod,Curtain Aluminium Rod HANGZHOU AG MACHINERY CO.,LTD , https://www.famourdecor.com
