技术领域technical field
本发明涉及电源充电控制系统领域，具体地说是一种无人直升机应急电源充电控制系统。The invention relates to the field of power charging control systems, in particular to an emergency power charging control system for unmanned helicopters.
背景技术Background technique
无人直升机在飞行过程中发动机可能发生停车现象，此时需要提供稳定的外部直流电源对发动机进行再启动以及为机上设备供电。锂电池具有高比能，无记忆特性等突出优点，用来作为无人直升机的应急电源系统的供电源，体积小，重量轻，占用无人直升机的载重及空间资源小。The engine of the unmanned helicopter may stop during the flight. At this time, it is necessary to provide a stable external DC power supply to restart the engine and power the on-board equipment. Lithium batteries have outstanding advantages such as high specific energy and no memory characteristics. They are used as the power supply for the emergency power system of unmanned helicopters. They are small in size and light in weight, and occupy less load and space resources of unmanned helicopters.
由于在无人直升机上对锂电池组充电，充电电压和电流有尖峰，并不稳定，对锂电池组造成损伤，影响锂电池组循环寿命。Because the lithium battery pack is charged on the unmanned helicopter, the charging voltage and current have spikes and are unstable, causing damage to the lithium battery pack and affecting the cycle life of the lithium battery pack.
发明内容Contents of the invention
针对现有技术的不足，本发明提供一种性能稳定、体积小、成本低、可靠性高的无人直升机应急电源充电控制系统Aiming at the deficiencies of the prior art, the present invention provides an unmanned helicopter emergency power charging control system with stable performance, small size, low cost and high reliability
本发明为实现上述目的所采用的技术方案是：一种无人直升机应急电源充电控制系统，其特征在于：输入模块输出端连接功率变换模块，发送充电电源信号到功率变换模块；The technical solution adopted by the present invention to achieve the above object is: an unmanned helicopter emergency power supply charging control system, characterized in that: the output terminal of the input module is connected to the power conversion module, and the charging power supply signal is sent to the power conversion module;
功率变换模块输出端连接输出模块，控制端连接PWM控制模块，接收PWM控制模块发送的控制信号，对输入模块输入的充电电源信号进行调节；The output end of the power conversion module is connected to the output module, the control end is connected to the PWM control module, and the control signal sent by the PWM control module is received to adjust the charging power signal input by the input module;
输出模块的输出端连接外部锂电池组，输出电源对锂电池组进行充电；The output terminal of the output module is connected to an external lithium battery pack, and the output power charges the lithium battery pack;
电流检测模块输入端连接输出模块，接收输出模块的电流信号，输出端连接PWM控制模块，对输出电流进行检测，并将检测结果输出到PWM控制模块；The input end of the current detection module is connected to the output module to receive the current signal of the output module, and the output end is connected to the PWM control module to detect the output current and output the detection result to the PWM control module;
电压检测模块输入端连接输出模块，接收输出模块的电压信号，输出端连接PWM控制模块，对输出电压进行检测，并将检测结果输出到PWM控制模块；The input end of the voltage detection module is connected to the output module to receive the voltage signal of the output module, and the output end is connected to the PWM control module to detect the output voltage and output the detection result to the PWM control module;
PWM控制模块输入端连接电流检测模块和电压检测模块，输出端连接功率变换模块，根据电压、电流检测结果，对功率变换模块进行控制，使充电电压、电流小于阈值。The input end of the PWM control module is connected to the current detection module and the voltage detection module, and the output end is connected to the power conversion module. According to the voltage and current detection results, the power conversion module is controlled to make the charging voltage and current less than the threshold.
所述所述PWM控制模块由4个二极管及UC2525AN芯片构成，其中电流检测模块、电压检测模块以及UC2525AN芯片分别与3个二极管负极连接，另一个二极管正极连接电源，负极与其他三个二极管正极连接，其中UC2525AN根据电压检测模块、电流检测模块的输出信号中较小的信号进行PWM信号宽度调节，将调节好的PWM信号输出到功率变换模块的MOS管G极。The PWM control module is composed of 4 diodes and UC2525AN chips, wherein the current detection module, the voltage detection module and the UC2525AN chip are respectively connected to the cathodes of the three diodes, the anode of the other diode is connected to the power supply, and the cathode is connected to the anodes of the other three diodes , wherein UC2525AN performs PWM signal width adjustment according to the smaller signal of the output signals of the voltage detection module and the current detection module, and outputs the adjusted PWM signal to the G pole of the MOS transistor of the power conversion module.
所述功率转换模块包括MOS管、电容、电感以及二极管，其中MOS管的D极、S极和电感串联在电路正极，电容和二极管并联在电路正负极，二极管正极连接电源负极，MOS管G极连接PWM控制模块输出端口，根据PWM控制模块输出的控制信号调节开关占空比。The power conversion module includes MOS transistors, capacitors, inductors and diodes, wherein the D pole, S pole and inductor of the MOS transistor are connected in series with the positive pole of the circuit, the capacitor and the diode are connected in parallel with the positive and negative poles of the circuit, and the positive pole of the diode is connected to the negative pole of the power supply. The pole is connected to the output port of the PWM control module, and the duty cycle of the switch is adjusted according to the control signal output by the PWM control module.
所述电流检测模块，包括两个运算放大器，PI电路以及电流基准，第一运算放大器的正负极分别与输出模块中的基准电阻连接，作为减法器计算基准电阻两端差值，该差值与电路输出电流呈正比例关系，第一运算放大器的输出端连接第二运算放大器负极，电压基准连接第二运算放大器正极，PI电路连接第二运算放大器负极与输出端之间，对输出模块的电流信号进行稳压调节，第二运算放大器将电流信号与基准信号进行比较，并将比较结果输出到PWM控制模块。The current detection module includes two operational amplifiers, a PI circuit and a current reference, the positive and negative poles of the first operational amplifier are respectively connected to the reference resistor in the output module, and the difference between the two ends of the reference resistor is calculated as a subtractor, and the difference It is directly proportional to the output current of the circuit. The output terminal of the first operational amplifier is connected to the negative pole of the second operational amplifier, the voltage reference is connected to the positive pole of the second operational amplifier, and the PI circuit is connected between the negative pole of the second operational amplifier and the output terminal. The signal is stabilized and regulated, and the second operational amplifier compares the current signal with the reference signal, and outputs the comparison result to the PWM control module.
所述电压检测模块，包括运算放大器，PI电路以及电压基准，PI电路对输出模块的电压信号进行稳压调节，运算放大器将电流信号与基准信号进行比较，并将比较结果输出到PWM控制模块。The voltage detection module includes an operational amplifier, a PI circuit and a voltage reference, the PI circuit performs voltage regulation on the voltage signal of the output module, the operational amplifier compares the current signal with the reference signal, and outputs the comparison result to the PWM control module.
本发明具有以下有益效果及优点：The present invention has the following beneficial effects and advantages:
1.体积小，可靠性强，可有效限制充电电流、电压大小。1. Small size, strong reliability, can effectively limit the charging current and voltage.
2.系统可根据限制条件，同时完成对电流、电压的限制，即两者中有一个超出限制，系统便会降低输出功率，防止过大的电流、电压对电池造成损伤。2. The system can limit the current and voltage at the same time according to the limit conditions, that is, if one of the two exceeds the limit, the system will reduce the output power to prevent damage to the battery caused by excessive current and voltage.
3.系统无需进行其他参数设置，使用方便。3. The system does not require other parameter settings and is easy to use.
附图说明Description of drawings
图1为本发明的充电控制系统框图；Fig. 1 is a block diagram of the charging control system of the present invention;
图2为本发明的电路原理示意图；Fig. 2 is the circuit schematic diagram of the present invention;
图3为本发明的电流检测模块电路原理图；Fig. 3 is the circuit schematic diagram of the current detection module of the present invention;
图4为本发明的电压检测模块电路原理图；Fig. 4 is the circuit schematic diagram of the voltage detection module of the present invention;
图5为本发明的PWM控制模块电路原理图。Fig. 5 is a circuit schematic diagram of the PWM control module of the present invention.
具体实施方式detailed description
下面结合附图及实施例对本发明做进一步的详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
如图1所示，本发明所述无人直升机应急电源充电控制系统，主要由输入模块、功率变换模块、输出模块、电流检测模块、电压检测模块、PWM控制模块构成。输入模块连接外部充电机，功率变换模块将充电机的充电电源进行限流、限压控制，最后通过输出模块输出到锂电池组。电流、电压检测模块检测输出到的充电电源中的电压、电流，反馈到PWM控制模块，调节功率变换模块中的MOS管导通时间占空比，进行反馈控制。As shown in Figure 1, the unmanned helicopter emergency power supply charging control system of the present invention is mainly composed of an input module, a power conversion module, an output module, a current detection module, a voltage detection module, and a PWM control module. The input module is connected to an external charger, and the power conversion module limits the current and voltage of the charging power of the charger, and finally outputs it to the lithium battery pack through the output module. The current and voltage detection module detects the output voltage and current of the charging power supply, and feeds back to the PWM control module to adjust the duty cycle of the MOS transistor in the power conversion module for feedback control.
如图2所示，本发明的功率变换模块主要由MOS管，电感、电容、二极管构成，MOS的导通时间占空比可对电源输出电压、电流大小进行控制，占空比越大系统输出的电压、电流相应的越大，电容、电感可将MOS管输出的方波信号滤波为直流信号，二极管防止电流逆流。输出模块中的电阻为测量电流使用，通过测量电阻两端电压，即可计算得出输出电流值。As shown in Figure 2, the power conversion module of the present invention is mainly composed of MOS tubes, inductors, capacitors, and diodes. The duty cycle of the MOS conduction time can control the output voltage and current of the power supply. The larger the duty cycle, the greater the system output. The larger the voltage and current, the capacitor and inductor can filter the square wave signal output by the MOS tube into a DC signal, and the diode prevents the current from flowing backward. The resistor in the output module is used for measuring current, and the output current value can be calculated by measuring the voltage across the resistor.
如图3所示，运算放大器1为一减法器，可计算出图2中基准电阻两端的电压差值，输出结果为(U2-U1)R2/R1，运算放大器2正极为预设的电流基准，负极为系统输出电流信号的计算值，运算放大器的正极与负极之间为电阻、电容构成的PI电路，对输出信号进行稳流，运算放大器的输出端即为电流检测模块的输出信号，即电流基准与稳流后的系统输出电压差值。As shown in Figure 3, the operational amplifier 1 is a subtractor, which can calculate the voltage difference between the two ends of the reference resistor in Figure 2, and the output result is (U2-U1)R2/R1, and the positive pole of the operational amplifier 2 is the preset current reference , the negative pole is the calculated value of the system output current signal, and the PI circuit composed of resistors and capacitors is between the positive pole and the negative pole of the operational amplifier to stabilize the output signal. The output terminal of the operational amplifier is the output signal of the current detection module, that is The difference between the current reference and the system output voltage after steady flow.
如图4所示，运算放大器正极为预设的电压基准，负极为系统输出电压，运算放大器的正极与负极之间为电阻、电容构成的PI电路，对输出信号进行稳流，运算放大器的输出端即为电压检测模块的输出信号，即电压基准与稳流后的系统输出电压差值。As shown in Figure 4, the positive pole of the operational amplifier is the preset voltage reference, and the negative pole is the system output voltage. The PI circuit composed of resistors and capacitors is between the positive pole and the negative pole of the operational amplifier, which stabilizes the output signal. The output of the operational amplifier The terminal is the output signal of the voltage detection module, that is, the difference between the voltage reference and the system output voltage after the current stabilization.
如图5所示，电压检测模块输出电压为UV，电流检测模块输出电压为UI，由于输出结果为基准与测量结果的差值，输出值越小，说明电路中测量结果越大，需要调节，电路中只有、UI中较小的值起作用，若UV较小，二极管压降约为0.7V，U0值为(UV+0.7)V，输出到芯片UC2525AN的结果为UV，芯片UC2525AN根据该值对PWM信号占空比进行设置，进而实现对输出电压的调节。UI值较小，与上述过程相同。As shown in Figure 5, the output voltage of the voltage detection module is UV , and the output voltage of the current detection module is UI . Since the output result is the difference between the reference and the measurement result, the smaller the output value, the greater the measurement result in the circuit. In the circuit, only the smaller value of U andI works. If UV is small, the diode voltage drop is about 0.7V, and the value of U0 is (UV +0.7)V. The result output to the chip UC2525AN is UV , the chip UC2525AN sets the duty ratio of the PWM signal according to this value, and then realizes the adjustment of the output voltage. The UI value is smaller, the same as the above process.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712379.9ACN105703418B (en) | 2014-11-28 | 2014-11-28 | A kind of depopulated helicopter emergency power supply charge control system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712379.9ACN105703418B (en) | 2014-11-28 | 2014-11-28 | A kind of depopulated helicopter emergency power supply charge control system |
| Publication Number | Publication Date |
|---|---|
| CN105703418Atrue CN105703418A (en) | 2016-06-22 |
| CN105703418B CN105703418B (en) | 2018-01-23 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410712379.9AActiveCN105703418B (en) | 2014-11-28 | 2014-11-28 | A kind of depopulated helicopter emergency power supply charge control system |
| Country | Link |
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| CN (1) | CN105703418B (en) |
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