Resistor R3 and reset pull-up resistor R4 and other components.
The main features of the MAX4373 are: low operating current, typical 50mA, wide operating voltage range, from 2.7V to 28V, controlled threshold current accuracy, typically 0.66%, and current sense amplifiers with three fixed gains (+20, + 50, +100, respectively, with the model suffixes T, F, H), no need to externally set the gain resistor, there is a wide common mode voltage range, from ~28V, operating temperature range -40X: pin arrangement as shown.
The working principle of the electronic circuit breaker V, N is the power supply of the load circuit, and is also the power supply of the MAX4373. After power-on, the power is supplied to the load after the RSENSE current detecting resistor. The load current flows through RSENSE and produces a voltage drop VSEmE at both ends. It is used as a current detection signal input current sense amplifier. If a fixed SAV is selected, the amplified voltage signal is output from the OUT terminal. VQUT=VSENSExAv. (Continued from the previous page) Determines whether the returned data is valid according to the value of the status. If the difference between the fields is within the normal error range, the number of backhauls is considered correct. Otherwise, think of the error.
Save the error message to the central database and ask the wrong vehicle. The verification is done by the central workstation (computer).
7. Conclusion In the process of implementation, you need to pay attention to the following two points: (丨) Use the same type of GPS receiver board to ensure the transmission clock synchronization. (2) According to the actual situation, reasonably determine the time interval of the sending unit during the polling process and the time interval for each mobile station to transmit data to ensure that the GPS data can be transmitted quickly and reliably, reducing data collision and loss. .
This method has been tested by the industrial and commercial bank's cash-carrying vehicle monitoring system and has achieved good results. The system works stably and reliably, and the real-time monitoring is improved. Under the original conditions, the system upgrade was realized. S3 (applies no oil to low level, the circuit can work again.
The comparator is an open-drain output. R3 is a pull-up resistor and also provides 7 L voltage.
(Not more than 5V) Rl, R2 form a voltage divider, which divides the voltage VUUT outputted by the current sense amplifier into the voltage comparator non-inverting terminal CIN1 and compares it with the inverting terminal (connected to the 0.6V reference voltage). If the current flowing into the load circuit does not exceed the set threshold voltage, the current senses the voltage output by the amplifier. After the voltage division by Rl.R2 is less than 0.6V, the voltage comparator outputs a low level, and the P-channel MOSFET is turned on. If the current flowing into the load circuit exceeds the set threshold current, the voltage detected by RSENSE is amplified by the current amplifier. After the output voltage R2 is divided by more than 0.6V, the voltage comparator is turned over, and the output 篼 level is turned off, so that the P-channel MOSFET is turned off and the circuit is cut off. The voltage comparator is of the output latch type, and once flipped, the output 篼 level latches, keeping the circuit off state. After troubleshooting, press the reset button (>2nS), voltage top view comparator reset, input: MAX4373 pin arrangement diagram circuit breaker component parameter calculation 1. Threshold current and detection current resistance Rsenm; S detection current resistance, it and setting The relationship between the threshold current (or maximum operating current 丨丨 and the detection voltage VsENSE(ma)丨 of the current sense amplifier is: and after selecting the gain of the MAX4373 by six seven (depending on the suffix of the model), the value can be found.
The output voltage V. of the current sense amplifier is: R1 and R2 are voltage divider resistors, and the middle head is connected to the non-inverting terminal CIN1 and compared with the inverting terminal (connected to the 0.6V reference voltage). If the current flowing through the RSENSE small dry threshold current IWAD (>, then the divided voltage (that is, the voltage input CIN1) is less than 0.6V, if the current flowing through RSENSE is large according to the above relationship, the following formula can be listed: : Precautions in the application The power supply voltage input to the load circuit can be the same power supply as the MAX4373 (for example), or it can be two different power supplies. If the power input to the load circuit is VtN, the Vee can be low, but V1N can't be higher than the relationship between V voltage and Vee. It is the output voltage of the current sense amplifier, it must be lower than the power consumption of the power supply. The resistance of RSENSE is not large, but the current flowing through it may be very large, then the consumption on RSENSE The power dissipation should be calculated according to the (IL0Aax>)2XRSENSE3 line, and the resistance power used is twice as large as the calculation. In the design, it is better to make the value of RSENSE larger.
The choice of VT has sufficient margin. In order to reduce the loss on Vt (RDS(N)xLoad) during conduction, a tube with a small on-resistance RDSWN丨 must be selected, generally tens of mQ. To select V, the voltage of BR1DSS is greater than V, N. To reduce the circuit board area of ​​the circuit breaker, it is recommended to use a chip MOSFET. The pull-up voltage (VPULLUP) of the 6 comparator is an open-drain output, and an external pull-up resistor is required, and a pull-up voltage (VpuLL-Up) is connected. According to MAXIM company data, this pull-up voltage can reach 5V. As shown.
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