[0046] The present invention will now be further described in conjunction with the embodiments and drawings:
[0047] A power supply array health management system of the present invention includes a main control unit, multiple data acquisition boards, and a differential communication bus. In the power supply array, each data acquisition board is installed in combination with each power supply and fan. The main control unit and each The data acquisition board is connected via a differential communication bus.
[0048] First of all, the present invention improves the data acquisition board: on the basis of the original data acquisition function, the power supply online voltage regulation circuit, the power switch circuit, and the fan online speed regulation circuit are added, so that it adds the correctness to the original single data acquisition function. Hardware condition guarantee for online maintenance of power supply.
[0049] Secondly, the present invention improves the control method of the main control unit: switch on and off by area and step by step; position and accurately adjust the output voltage, slow start output voltage by area and step by step; position and accurately set the fan speed, and by area according to the temperature of the power array Distributed setting of fan speed in each area; online maintenance of power supply status, that is, adaptive adjustment of output voltage or fan speed, recording power supply status and reporting, and online redundancy switching or alarming when abnormal.
[0050] Such as figure 1 As shown, a power supply array health management system of the present invention includes a main control unit, multiple data acquisition boards, and a differential communication bus. In the power supply array, each data acquisition board is installed in combination with each power supply and fan, and the main control The unit is connected with each data acquisition board through a differential communication bus.
[0051] 1. Data acquisition board
[0052] Such as figure 2 As shown, the data acquisition board includes the sub-controller and its interface circuit, as well as the power state detection circuit connected to the sub-controller and its interface circuit, the power switch circuit, the power supply online voltage regulating circuit, the fan speed control circuit, the fan detection circuit, Differential bus communication circuit.
[0053] (1) Circuit connected to the power supply
[0054] The power state acquisition circuit collects the output voltage, current, working temperature and other working state signals from the power supply, converts the output current sampling signal into a voltage signal, converts the working temperature into a frequency signal, and converts the obtained three voltage and frequency signals into data respectively , And then sent to the sub-controller and its interface circuit.
[0055] The power switch circuit receives the voltage switch control signal output by the sub-controller and the interface circuit, and converts the low-level voltage control signal into a high-level power switch signal to realize the control of the power switch. The power on/off control is to control its AC input power supply, or it can be the work enable signal of the main control chip that controls the power supply to realize the on/off control of each power supply according to the requirements of the main control unit.
[0056] The power supply online voltage regulation circuit receives the output voltage regulation data of the sub-controller and the interface circuit, and converts it into a variable-level signal through a digital-to-analog converter, which is used as the voltage reference for power supply output voltage regulation, so as to realize the output voltage online Voltage regulation. Another implementation method is that the power supply on-line voltage regulation circuit receives the output voltage regulation data of the sub-controller and the interface circuit, and controls the resistance value of the digital potentiometer connected in series with the power sampling circuit, so as to realize the power output voltage regulation and output The voltage is adjusted online.
[0057] (2) The circuit connected to the fan
[0058] The fan used in the power array can be equipped with a speed detection line and a speed adjustment line. Among them, the speed detection line converts the fan speed into a pulse square wave frequency; the speed adjustment line can receive a PWM signal, that is, a pulse width modulation signal with a variable duty cycle, that is, the larger the duty cycle, the faster the fan speed, and it can also receive electricity. Level control signal, that is, the higher the level, the faster the fan speed.
[0059] The fan detection circuit collects the speed signal from the fan speed detection line. This signal is the frequency that converts the fan speed into a pulse square wave. The timing counter in the fan detection circuit detects the pulse square wave, counts the pulses per unit time, and converts the frequency to binary The data is then sent to the sub-controller and its interface circuit. In the sub-controller and interface circuit, the actual speed of the fan is calculated according to the speed formula. The speed formula can be: fan speed = measured value × 600/min.
[0060] The fan on-line speed regulation circuit converts the duty cycle data of the speed regulation command sent by the sub-controller and the interface circuit into a PWM control signal corresponding to the duty cycle, and inputs the fan speed adjustment line to realize the fan speed adjustment.
[0061] 2. Main control unit
[0062] Such as image 3 As shown, the main control unit includes a main controller and an interface circuit, a differential bus communication circuit, and a superior system communication circuit. The main controller and interface circuit are connected to the differential communication bus through the differential bus communication circuit, and the main controller and interface circuit pass through the superior system. The communication circuit is connected to the upper-level system.
[0063] (1) Main controller and interface circuit
[0064] The main controller and the interface circuit can be a single-chip microcomputer and an interface circuit. The interface circuit includes a program memory, a data memory and an IO interface circuit. The main controller and interface circuit can also be PLC controllers, industrial control computers, etc.
[0065] Such as Figure 4 As shown, the function of the power array health management system of the present invention is realized by the main controller and the interface circuit.
[0066] The main controller addresses each data acquisition board and accurately locates the power supply and fan corresponding to the data acquisition board. Divide the area of the power array, that is, classify the addresses of each power supply and fan. The method of dividing the area can be from top to bottom, from left to right, from inside to outside, from outside to inside, or any way, etc., which is convenient for checking The power supply or fan in the power supply array can be positioned and accurately operated in batches.
[0067] First of all, it can realize the step-by-step switching of power supplies in different regions, reduce the surge of the power supply system when starting, reduce electromagnetic interference, and improve reliability. In addition to avoiding damage to the power supply in the power array, it also reduces the power grid or power generation. The backflow impact of the power supply system of the machine, etc., ensures the safe operation of the power supply system.
[0068] Secondly, the output voltage of each power supply in different regions can be accurately adjusted step by step, so that the output voltage of the power supply can be slow-started at any time sequence, and the output voltage can slowly rise to the rated operating voltage, reducing the impact on the load side; In addition, the precise positioning adjustment of the output voltage amplitude can also realize the power adjustment of the radio frequency transceiver module.
[0069] Then, according to the temperature distribution of the power supply array, divide the area of the fan array, and accurately set the fan speed of each area according to the temperature distribution positioning; and can make adaptive adjustments to the fans corresponding to each power supply of the power supply array, such as when the power supply heat consumption increases , Increase the corresponding fan speed to improve the heat dissipation capacity, and vice versa, reduce the corresponding fan speed. In this way, the problems of large noise and high power consumption during operation caused by the large-scale fan array and the large number of fans are solved, and the effect of reducing noise and consumption and reducing electromagnetic interference is achieved.
[0070] Finally, by accurately positioning each power supply and fan in the power supply array, accurately positioning and regulating the output voltage of each power supply, and accurately adjusting the positioning of the fan speed, realizing online maintenance of the power supply status, timely online redundancy switching when working abnormally, and power supply status recording And report, overhaul and alarm.
[0071] Such as Figure 5 As shown, after starting to work, the main controller and interface circuit read the power array status data to determine the health status of each power supply of the power array:
[0072] e. Working normally:
[0073] Regularly count and record the working status parameters of each power supply of the power supply array and the duration of normal working.
[0074] f. Performance degradation
[0075] Statistically record the current time, location, and abnormal power supply working status parameters; locate and accurately adjust the output voltage of the abnormal power supply; and adjust the wind speed of the fan related to the power supply to adjust the power supply status to an acceptable working state; at the same time report the abnormal power supply location and status parameters.
[0076] g. Failure replacement
[0077] Statistically record the current time, location, and working status parameters of the failed power supply; realize redundant switching of the backup power supply, record and report the backup power supply location and status parameter information.
[0078] When the number of power switches exceeds the number of backup power supplies, an alarm will be displayed.
[0079] h. Changes in the external working environment
[0080] Statistically record the current external environment temperature and load current change information; locate and accurately adjust the output voltage of the power supply affected by it; and adjust the wind speed of the fan related to the power supply to adjust the power status to normal working status; report the external environment temperature and load current change information .
[0081] In addition, the historical data of the power array is recorded for future reference in order to analyze the health status and trend of the power array operation, and determine whether the health status of the power array has declined, so as to provide a basis for online maintenance of the power array.
[0082] (2) Differential bus communication circuit
[0083] The main controller and the interface circuit are connected with the differential communication bus through the differential bus communication circuit.
[0084] The differential bus communication circuit is implemented by a dedicated interface chip that meets the corresponding differential bus hardware specifications, and the interface chip is physically isolated by an optoelectronic isolation device, and an anti-interference filter circuit is added to the signal line and clock line of the interface chip to eliminate Electromagnetic interference improves the reliability of the differential bus communication circuit.
[0085] (3) Upper-level system communication circuit
[0086] The main controller and the interface circuit are connected with the upper-level system through the upper-level system communication circuit.
[0087] The upper-level system communication circuit is realized by a dedicated interface chip with the same communication interface as the upper-level system, and an optoelectronic isolation device is used to physically isolate the interface chip, and an anti-interference filter circuit is added to the signal line and clock line of the interface chip to eliminate Electromagnetic interference improves the reliability of the communication circuit of the superior system.
[0088] 3. Differential communication bus
[0089] In view of the large number of power sources, scattered locations, and complex electromagnetic environment in the power array, a differential communication bus with high reliability, strong anti-interference ability, and large expansion capacity is adopted. The differential communication bus can be Ethernet bus, CAN bus, RS485 bus And so on to replace the commonly used I in traditional power detection with short communication distance and poor anti-interference ability 2 C bus communication circuit to realize reliable communication between multiple data acquisition boards at different positions and different distances in the power array and the main control unit.
