CN107167747A - The monitoring device and method of CCM buck converter inductance and output capacitance - Google Patents
The monitoring device and method of CCM buck converter inductance and output capacitance Download PDFInfo
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Abstract
本发明公开了一种CCM降压变换器电感及输出电容的监测装置及方法，该装置包括Buck变换器主功率电路、驱动电路、显示单元，一只参数已知的电容与电流互感器，以及信号处理模块，其中信号处理模块包括功率电路控制单元、开关频率fs计算单元、占空比D计算单元、输出电压采样单元、电容电流触发采样单元、电感L以及电容ESR和C计算单元。本发明可以在不影响电路正常工作的情况下对电感的参数L以及电容的参数ESR和C进行监测，为电容和电源的寿命预测提供依据，无需额外参数，方便实现。
The invention discloses a monitoring device and method for inductance and output capacitance of a CCM step-down converter. The device comprises a Buck converter main power circuit, a drive circuit, a display unit, a capacitance and a current transformer with known parameters, and Signal processing module, wherein the signal processing module includes a power circuit control unit, a switching frequency f s calculation unit, a duty ratio D calculation unit, an output voltage sampling unit, a capacitor current trigger sampling unit, an inductor L and a capacitor ESR and C calculation unit. The invention can monitor the parameter L of the inductance and the parameters ESR and C of the capacitor without affecting the normal operation of the circuit, and provides a basis for life prediction of the capacitor and the power supply without additional parameters and is convenient for realization.
Description
技术领域technical field
本发明属于电能变换装置中的监测技术领域，特别是涉及一种CCM降压变换器电感及输出电容的监测装置及方法。The invention belongs to the technical field of monitoring in electric energy conversion devices, in particular to a monitoring device and method for inductance and output capacitance of a CCM step-down converter.
背景技术Background technique
开关电源具有效率高、体积小等优点，在日常生产生活中广泛应用。降压(Buck)、升压(Boost)、升降压(Buck-Boost)变换器是三种最基本的开关电源变换器，其他的变换器均可以由这三种变换器衍变而来。其中，CCM(Continuous Current Mode，电流连续模式)Buck变换器在计算机电源、通讯电源、航空航天等领域广泛使用。在Buck变换器电路中为了得到较为稳定的输出电压，一般需要利用电容来滤除高频噪声。变换器工作一段时间之后，电容的容值(Capacitance,C)和等效串联电阻(Equivalent Series Resistance,ESR)会发生变化，当该变化量较大时，即认为该电容已失效，将会造成电源和系统的运行故障，，因此监测CCM Buck变换器的输出滤波电容的ESR和C，预测其寿命非常重要。现有的技术主要可分为离线监测技术和在线监测技术，离线检测技术使用方法简单，成本低，但一般只监测独立于电路外的电容，而在线检测技术可以检测在电路中处于工作状态的电容，但使用方法复杂，且需要知晓电路中的许多其他参数。Switching power supply has the advantages of high efficiency and small size, and is widely used in daily production and life. Buck, Boost, and Buck-Boost converters are the three most basic switching power converters, and other converters can be derived from these three converters. Among them, CCM (Continuous Current Mode, current continuous mode) Buck converter is widely used in computer power supply, communication power supply, aerospace and other fields. In order to obtain a relatively stable output voltage in a Buck converter circuit, it is generally necessary to use a capacitor to filter out high-frequency noise. After the converter works for a period of time, the capacitance (Capacitance, C) and equivalent series resistance (Equivalent Series Resistance, ESR) of the capacitor will change. When the change is large, it is considered that the capacitor has failed, which will cause The operation failure of the power supply and the system, so it is very important to monitor the ESR and C of the output filter capacitor of the CCM Buck converter and predict its life. The existing technologies can be mainly divided into offline monitoring technology and online monitoring technology. The offline detection technology is simple to use and low in cost, but generally only monitors the capacitance independent of the circuit, while the online detection technology can detect the capacitors in the working state in the circuit. Capacitors, but are complicated to use and require knowledge of many other parameters in the circuit.
发明内容Contents of the invention
本发明的目的在于提供一种CCM降压变换器电感及输出电容的监测装置及方法，能够实时监测电感的感值L以及等效串联电阻ESR和电容的容值C的变化，对电解电容和电源的寿命进行准确预测。The object of the present invention is to provide a monitoring device and method for the inductance and output capacitance of a CCM step-down converter, which can monitor the inductance value L of the inductance and the change of the capacitance value C of the equivalent series resistance ESR and the capacitance in real time. The life of the power supply is accurately predicted.
实现本发明目的的技术解决方案为：一种CCM降压变换器输出电容ESR和C的监测装置包括Buck变换器主功率电路、驱动电路、显示单元，一只参数已知的电容与电流互感器，以及信号处理模块，所述信号处理模块包括功率电路控制单元、开关频率fs计算单元、占空比D计算单元、输出电压采样单元、电容电流触发采样单元、电感L以及电容ESR和C计算单元；The technical solution that realizes the object of the present invention is: a kind of monitoring device of CCM step-down converter output capacitance ESR and C comprises Buck converter main power circuit, drive circuit, display unit, a capacitance and current transformer with known parameters , and a signal processing module, the signal processing module includes a power circuit control unit, a switching frequency f s calculation unit, a duty cycle D calculation unit, an output voltage sampling unit, a capacitor current trigger sampling unit, an inductance L and a capacitor ESR and C calculation unit;
所述Buck变换器主功率电路包括输入电压源Vin、开关管Qb、续流二极管Db、滤波电感L、输出滤波电容和负载RL，所述输出滤波电容包括等效串联电阻ESR和电容C，其中开关管Qb的漏极与电压源Vin的正极连接，续流二极管Db的阴极与开关管Qb的漏极连接，续流二极管Db的阳极与电压源Vin的负极连接，滤波电感L的一端与续流二极管Db的阴极连接，滤波电感L的另一端分别与等效串联电阻ESR的一端及负载RL的一端连接，等效串联电阻ESR的另一端与电容C的一端连接，电容C的另一端及负载RL的另一端均与电压源Vin的负极连接，负载RL两端为输出平均电压Vo；The main power circuit of the Buck converter includes an input voltage source V in , a switch tube Q b , a freewheeling diode D b , a filter inductor L, an output filter capacitor and a load R L , and the output filter capacitor includes an equivalent series resistance ESR and Capacitor C, wherein the drain of the switch tube Qb is connected to the anode of the voltage source V in , the cathode of the freewheeling diode Db is connected to the drain of the switch tube Qb, and the anode of the freewheeling diode Db is connected to the anode of the voltage source Vin Negative connection, one end of the filter inductor L is connected to the cathode of the freewheeling diode Db , the other end of the filter inductor L is connected to one end of the equivalent series resistance ESR and one end of the load R L , and the other end of the equivalent series resistance ESR is connected to One end of the capacitor C is connected, the other end of the capacitor C and the other end of the load RL are both connected to the negative pole of the voltage source V in , and both ends of the load RL are the output average voltage V o ;
所述功率电路控制单元的输入端分别与Buck变换器主功率电路的电压源Vin和输出平均电压Vo连接，功率电路控制单元输出端的PWM信号分别接入开关频率fs计算单元和占空比D计算单元，Buck变换器主功率电路的输出平均电压Vo接入输出电压采样单元，电流互感隔离放大单元和功率电路控制单元输出端的PWM信号均接入电容电流触发采样单元，开关频率fs计算单元、占空比D计算单元、输出电压采样单元和电容电流触发采样单元的输出端均接入电容ESR和C计算单元，电感L以及电容ESR和C计算单元的输出端接入显示单元；The input end of the power circuit control unit is respectively connected with the voltage source V in and the output average voltage V o of the main power circuit of the Buck converter, and the PWM signal at the output end of the power circuit control unit is respectively connected to the switching frequency f s calculation unit and the duty cycle The ratio D calculation unit, the output average voltage V o of the main power circuit of the Buck converter is connected to the output voltage sampling unit, the PWM signal at the output end of the current mutual inductance isolation amplification unit and the power circuit control unit is connected to the capacitive current trigger sampling unit, and the switching frequency is f The output terminals of the s calculation unit, the duty ratio D calculation unit, the output voltage sampling unit and the capacitive current trigger sampling unit are all connected to the capacitor ESR and C calculation unit, and the output terminals of the inductance L, capacitor ESR and C calculation unit are connected to the display unit ;
所述驱动电路的输入端与功率电路控制单元输出端的PWM信号连接，驱动电路的输出端接入开关管Qb的门极。The input end of the drive circuit is connected to the PWM signal at the output end of the power circuit control unit, and the output end of the drive circuit is connected to the gate of the switch tube Qb .
一种CCM降压变换器输出电容ESR和C的监测方法，包括以下步骤：A method for monitoring the output capacitor ESR and C of a CCM step-down converter, comprising the following steps:
步骤1，在输出端并联上一个参数已知的电容，在信号处理模块中创建功率电路控制单元、开关频率fs计算单元、占空比D计算单元、输出电压采样单元、电容电流触发采样单元、电感L以及电容ESR和C计算单元；Step 1, connect a capacitor with known parameters in parallel at the output end, and create a power circuit control unit, a switching frequency f s calculation unit, a duty ratio D calculation unit, an output voltage sampling unit, and a capacitor current trigger sampling unit in the signal processing module , inductance L and capacitance ESR and C calculation unit;
步骤2，信号处理模块的功率电路控制单元根据Buck变换器主功率电路的输出平均电压Vo，得到PWM信号并经驱动电路驱动开关管Qb；Step 2, the power circuit control unit of the signal processing module obtains the PWM signal according to the output average voltage V o of the main power circuit of the Buck converter and drives the switching tube Q b through the driving circuit;
步骤3，功率电路控制单元输出的PWM信号送入开关频率fs计算单元和占空比D计算单元，经开关频率fs计算单元处理得出变换器当前的开关频率fs，经占空比D计算单元处理得出变换器当前的占空比D；Step 3, the PWM signal output by the power circuit control unit is sent to the switching frequency f s calculation unit and the duty ratio D calculation unit, and the current switching frequency f s of the converter is obtained through the processing of the switching frequency f s calculation unit. The D calculation unit processes and obtains the current duty ratio D of the converter;
步骤4，Buck变换器主功率电路的输出平均电压Vo送入输出电压采样单元，得到输出电压的平均值；Step 4, the output average voltage V o of the main power circuit of the Buck converter is sent to the output voltage sampling unit to obtain the average value of the output voltage;
步骤5，功率电路控制单元输出的PWM信号和电流互感隔离放大单元(8)的电容电流ix送入电容电流触发采样单元，通过延时程序对电容电流等DTs/10间隔采样，得到ix(0)、ix(DTs/10)、ix(DTs/5)、ix(3DTs/10)、ix(2DTs/5)、ix(DTs/2)、ix(3DTs/5)、ix(7DTs/10)、ix(4DTs/5)、ix(9DTs/10)、ix(DTs)共11个值；Step 5, the PWM signal output by the power circuit control unit and the capacitive current i x of the current mutual inductance isolation amplifying unit (8) are sent to the capacitive current trigger sampling unit, and the capacitive current is sampled at intervals of DT s /10 through a delay program to obtain i x (0), i x (DT s /10), i x (DT s /5), i x (3DT s /10), i x (2DT s /5), i x (DT s /2), i x (3DT s /5), i x (7DT s /10), i x (4DT s /5), i x (9DT s /10), i x (DT s ) a total of 11 values;
步骤6，将得到的开关频率fs、占空比D、输出电压的平均值Vo以及电容电流的瞬时值ix(0)、ix(DTs/10)、ix(DTs/5)、ix(3DTs/10)、ix(2DTs/5)、ix(DTs/2)、ix(3DTs/5)、ix(7DTs/10)、ix(4DTs/5)、ix(9DTs/10)、ix(DTs)送入电感L以及电容ESR和C计算单元进行曲线拟合和综合处理，得到Buck变换器中电感L的值以及输出滤波电容当前等效串联电阻ESR和电容C的值；Step 6, the obtained switching frequency f s , duty cycle D, average value V o of output voltage and instantaneous value of capacitor current i x (0), i x (DT s /10), i x (DT s / 5), ix ( 3DT s /10), ix (2DT s /5), ix (DT s /2), ix ( 3DT s /5), ix ( 7DT s /10), ix (4DT s /5), i x (9DT s /10), i x (DT s ) are sent to the calculation unit of the inductance L and the capacitance ESR and C for curve fitting and comprehensive processing, and the value of the inductance L in the Buck converter is obtained And the value of the current equivalent series resistance ESR and capacitance C of the output filter capacitor;
步骤7，电感L以及电容ESR和C计算单元将所得的电感L以及等效串联电阻ESR和电容C的值送入显示单元实时显示。In step 7, the calculation unit of the inductance L and the capacitance ESR and C sends the obtained values of the inductance L, the equivalent series resistance ESR and the capacitance C to the display unit for real-time display.
与现有技术相比，本发明的显著优点为：本发明针对CCM Buck变换器的电感和输出滤波电容，设计出一种高效稳定的电感L以及输出滤波电容等效串联电阻ESR和电容C的在线监测装置及方法，该方法可以在不影响电路正常工作的情况下对电感的参数L以及电容的参数ESR和C进行监测，为电容和电源的寿命预测提供依据，无需额外参数，方便实现。Compared with the prior art, the significant advantages of the present invention are: the present invention designs a highly efficient and stable inductance L and output filter capacitor equivalent series resistance ESR and capacitance C for the inductance and output filter capacitor of the CCM Buck converter. The online monitoring device and method can monitor the parameter L of the inductance and the parameters ESR and C of the capacitor without affecting the normal operation of the circuit, and provide a basis for life prediction of the capacitor and the power supply without additional parameters, which is convenient for implementation.
附图说明Description of drawings
图1是CCM Buck变换器开关周期中的工作波形图。Fig. 1 is a working waveform diagram in the switching cycle of the CCM Buck converter.
图2是本发明CCM降压变换器电感L以及输出电容ESR和C的监测装置的结构示意图。FIG. 2 is a structural schematic diagram of a monitoring device for the inductance L and the output capacitors ESR and C of the CCM step-down converter of the present invention.
其中：Vin-输入电压，Iin-输入电流，iL-电感电流，iC-电容电流，iCx-并联电容电流，Io-输出电流，Vo-输出电压平均值，Qb-开关管，Db-二极管，L-电感，C-输出滤波电容值，ESR-等效串联电阻值，Cx-并联电容的电容值，ESRx-并联电容的等效串联电阻值，RL-负载，Vgs-开关管Qb的驱动电压，D-占空比，t-时间，fs-变换器开关频率，ΔIL-电感电流纹波峰峰值，vESR-等效串联电阻上的电压，vC-电容上的电压。Among them: V in - input voltage, I in - input current, i L - inductor current, i C - capacitor current, i Cx - parallel capacitor current, I o - output current, V o - output voltage average value, Q b - Switching tube, D b - diode, L - inductor, C - output filter capacitor value, ESR - equivalent series resistance value, Cx - capacitance value of parallel capacitor, ESRx - equivalent series resistance value of parallel capacitor, R L - load , V gs - driving voltage of switching tube Q b , D - duty cycle, t - time, f s - converter switching frequency, ΔI L - peak-to-peak value of inductor current ripple, v ESR - voltage on equivalent series resistance, v C - the voltage across the capacitor.
具体实施方式detailed description
下面结合附图及具体实施例对本发明作出进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
1、理论推导：1. Theoretical derivation:
图1为CCM Buck变换器开关周期中的工作波形图。当开关管Qb导通时，二极管Db截止，电感L两端的电压为Vo/D-Vo，其电感电流iL以(Vo/D-Vo)/L的斜率线性上升。当二极管Db关断时，电感电流iL通过二极管Db续流，此时电感L两端的电压为-Vo，电感电流iL以Vo/L的斜率下降。由于Buck变换器工作在CCM模式，因此在开关周期结束前，电感电流iL未下降到零。电感电流iL在一个开关周期内的平均值即为输出电流Io。Figure 1 is a working waveform diagram in the switching cycle of the CCM Buck converter. When the switch tube Q b is turned on, the diode D b is turned off, the voltage across the inductor L is V o /DV o , and the inductor current i L rises linearly with a slope of (V o /DV o )/L. When the diode D b is turned off, the inductor current i L continues to flow through the diode D b . At this time, the voltage across the inductor L is -V o , and the inductor current i L drops with a slope of V o /L. Since the Buck converter works in CCM mode, the inductor current i L does not drop to zero before the switching period ends. The average value of the inductor current i L within one switching cycle is the output current I o .
电感电流iL在一个周期中的表达式如下：The expression of the inductor current i L in one cycle is as follows:
其中Vo为输出电压平均值，L为电感值，fs为Buck变换器的开关频率，D为开关管的占空比，t为时间。Among them, V o is the average value of the output voltage, L is the inductance value, f s is the switching frequency of the Buck converter, D is the duty cycle of the switching tube, and t is the time.
可以假设can assume
可得，两电容的电流和iC+iCx的表达式为：It can be obtained that the expression of the current of the two capacitors and i C +i Cx is:
两电容的电压表达式分别为The voltage expressions of the two capacitors are
由于两电容并联，则两电容电压相等Since two capacitors are connected in parallel, the voltages of the two capacitors are equal
vC(t)＝vCx(t) (9)v C (t) = v Cx (t) (9)
当时，when hour,
由式(10)求导可得From formula (10) derivation can get
分别对式(11)等号两边做Laplace变换可得Doing Laplace transform on both sides of the equal sign in equation (11) respectively, we can get
化简可得Simplify and get
对式(13)等号做Laplace逆变换可得Do the inverse Laplace transform on the equation (13) to get
其中in
根据采样得到的11个并联电容电流值可以做出拟合曲线，得到X1、X2、X3和iCx(0)。According to the current values of the 11 parallel capacitors obtained by sampling, a fitting curve can be made to obtain X 1 , X 2 , X 3 and i Cx (0).
把式(2)、(3)代入(15)、(16)、(17)可得：Substitute (2), (3) into (15), (16), (17) to get:
式中，L为电感的感值，ESR为等效串联电阻的阻值，C为电容的容值，fs为变换器开关频率，Vo为输出电压平均值，D为变换器的占空比，ESRx为所并联电容的等效串联电阻的阻值，Cx为所并联电容的电容的容值，X1、X2、X3为拟合曲线的参数。In the formula, L is the inductance value of the inductor, ESR is the resistance value of the equivalent series resistance, C is the capacitance value of the capacitor, f s is the switching frequency of the converter, V o is the average value of the output voltage, and D is the duty of the converter ESRx is the resistance value of the equivalent series resistance of the capacitor connected in parallel, Cx is the capacitance value of the capacitor connected in parallel, and X 1 , X 2 , X 3 are the parameters of the fitting curve.
基于式(18)、(19)、(20)，可以得到CCM Buck变换器电感L以及输出滤波电容ESR和C的监测方法。Based on equations (18), (19), and (20), the monitoring method for the inductance L of the CCM Buck converter and the output filter capacitors ESR and C can be obtained.
2、本发明CCM降压变换器电感及输出电容的监测装置及方法2. The monitoring device and method for the inductance and output capacitance of the CCM step-down converter of the present invention
结合图2，本发明CCM降压变换器电感及输出电容的监测装置，包括Buck变换器主功率电路1、驱动电路3、参数已知的电容7、电流互感隔离放大单元8、显示单元11和信号处理模块，所述信号处理模块包括功率电路控制单元2、开关频率fs计算单元4、占空比D计算单元5、输出电压采样单元6、电容电流触发采样单元9、电感L以及电容ESR和C计算单元10；In conjunction with FIG. 2 , the monitoring device for the inductance and output capacitance of the CCM step-down converter of the present invention includes a Buck converter main power circuit 1, a drive circuit 3, a capacitor 7 with known parameters, a current mutual inductance isolation amplification unit 8, a display unit 11 and A signal processing module, the signal processing module includes a power circuit control unit 2, a switching frequency f s calculation unit 4, a duty cycle D calculation unit 5, an output voltage sampling unit 6, a capacitor current trigger sampling unit 9, an inductor L and a capacitor ESR and C computing unit 10;
所述Buck变换器主功率电路1包括输入电压源Vin、开关管Qb、续流二极管Db、滤波电感L、输出滤波电容和负载RL，所述输出滤波电容包括等效串联电阻ESR和电容C，其中开关管Qb的漏极与电压源Vin的正极连接，续流二极管Db的阴极与开关管Qb的漏极连接，续流二极管Db的阳极与电压源Vin的负极连接，滤波电感L的一端与续流二极管Db的阴极连接，滤波电感L的另一端分别与等效串联电阻ESR的一端及负载RL的一端连接，等效串联电阻ESR的另一端与电容C的一端连接，电容C的另一端及负载RL的另一端均与电压源Vin的负极连接，负载RL与参数已知的电容(7)并联，其两端为输出平均电压Vo。The main power circuit 1 of the Buck converter includes an input voltage source V in , a switch tube Q b , a freewheeling diode D b , a filter inductor L, an output filter capacitor and a load R L , and the output filter capacitor includes an equivalent series resistance ESR and capacitance C, wherein the drain of the switch tube Q b is connected to the anode of the voltage source V in , the cathode of the freewheeling diode D b is connected to the drain of the switch tube Q b , and the anode of the freewheeling diode D b is connected to the voltage source V in One end of the filter inductor L is connected to the cathode of the freewheeling diode D b , the other end of the filter inductor L is respectively connected to one end of the equivalent series resistance ESR and one end of the load R L , and the other end of the equivalent series resistance ESR Connect to one end of the capacitor C, the other end of the capacitor C and the other end of the load RL are connected to the negative pole of the voltage source V in , the load RL is connected in parallel with the capacitor (7) whose parameters are known, and its two ends are the output average voltage V o .
所述功率电路控制单元2的输入端分别与Buck变换器主功率电路1的电压源Vin和输出平均电压Vo连接，功率电路控制单元2输出端的PWM信号分别接入开关频率fs计算单元4和占空比D计算单元5，Buck变换器主功率电路1的输出平均电压Vo接入输出电压采样单元6，电流互感隔离放大单元8和功率电路控制单元2输出端的PWM信号均接入电容电流触发采样单元9，开关频率fs计算单元4、占空比D计算单元5、输出电压采样单元6和电容电流触发采样单元9的输出端均接入电容ESR和C计算单元7，电感L以及电容ESR和C计算单元10的输出端接入显示单元11；所述驱动电路3的输入端与功率电路控制单元2输出端的PWM信号连接，驱动电路3的输出端接入开关管Qb的门极。所述信号处理模块为DSP芯片TMS320F28335；所述显示单元11为1602液晶显示屏。The input terminals of the power circuit control unit 2 are respectively connected to the voltage source V in and the output average voltage V o of the main power circuit 1 of the Buck converter, and the PWM signals at the output terminals of the power circuit control unit 2 are respectively connected to the switching frequency f s calculation unit 4 and the duty cycle D calculation unit 5, the output average voltage V o of the main power circuit 1 of the Buck converter is connected to the output voltage sampling unit 6, and the current mutual inductance isolation amplification unit 8 and the PWM signal at the output of the power circuit control unit 2 are connected to Capacitive current trigger sampling unit 9, switching frequency f s calculation unit 4, duty ratio D calculation unit 5, output voltage sampling unit 6 and output terminals of capacitor current trigger sampling unit 9 are all connected to capacitor ESR and C calculation unit 7, inductor The output end of L and the capacitor ESR and C calculation unit 10 is connected to the display unit 11; the input end of the drive circuit 3 is connected to the PWM signal of the output end of the power circuit control unit 2, and the output end of the drive circuit 3 is connected to the switch tube Q b gate pole. The signal processing module is a DSP chip TMS320F28335; the display unit 11 is a 1602 liquid crystal display.
基于本发明CCM降压变换器电感及输出电容的监测装置的监测方法，包括以下步骤：The monitoring method based on the monitoring device of CCM step-down converter inductance and output capacitance of the present invention comprises the following steps:
步骤1，在输出端并联上一个参数已知的电容7，在信号处理模块中创建功率电路控制单元2、开关频率fs计算单元4、占空比D计算单元5、输出电压采样单元6、电容电流触发采样单元9、电感L以及电容ESR和C计算单元10；Step 1, connect a capacitor 7 with known parameters in parallel at the output end, create a power circuit control unit 2, a switching frequency f s calculation unit 4, a duty cycle D calculation unit 5, an output voltage sampling unit 6, The capacitive current triggers the sampling unit 9, the inductance L and the capacitance ESR and C calculation unit 10;
步骤2，信号处理模块的功率电路控制单元2根据Buck变换器主功率电路1的输出平均电压Vo，得到PWM信号并经驱动电路3驱动开关管Qb；Step 2, the power circuit control unit 2 of the signal processing module obtains the PWM signal according to the output average voltage V o of the main power circuit 1 of the Buck converter and drives the switching tube Q b through the driving circuit 3;
步骤3，功率电路控制单元2输出的PWM信号送入开关频率fs计算单元4和占空比D计算单元5，经开关频率fs计算单元4处理得出变换器当前的开关频率fs，经占空比D计算单元5处理得出变换器当前的占空比D；Step 3, the PWM signal output by the power circuit control unit 2 is sent to the switching frequency f s calculation unit 4 and the duty ratio D calculation unit 5, and the current switching frequency f s of the converter is obtained through the processing of the switching frequency f s calculation unit 4, The current duty ratio D of the converter is obtained through the processing of the duty ratio D calculation unit 5;
步骤4，Buck变换器主功率电路1的输出平均电压Vo送入输出电压采样单元6，得到输出电压的平均值；Step 4, the output average voltage V o of the main power circuit 1 of the Buck converter is sent to the output voltage sampling unit 6 to obtain the average value of the output voltage;
步骤5，功率电路控制单元2输出的PWM信号和电流互感隔离放大单元8的电容电流ix送入电容电流触发采样单元9，通过延时程序处理对电容电流等DTs/10间隔采样，得到电容电流的瞬时值ix(0)、ix(DTs/10)、ix(DTs/5)、ix(3DTs/10)、ix(2DTs/5)、ix(DTs/2)、ix(3DTs/5)、ix(7DTs/10)、ix(4DTs/5)、ix(9DTs/10)、ix(DTs)共11个值；Step 5, the PWM signal output by the power circuit control unit 2 and the capacitive current i x of the current mutual inductance isolation amplifying unit 8 are sent to the capacitive current trigger sampling unit 9, and the capacitive current is sampled at intervals of DT s /10 through delay program processing, and the obtained Instantaneous values of capacitive current ix ( 0 ) , ix (DT s /10), ix (DT s /5), ix ( 3DT s /10), ix (2DT s /5), ix ( DT s /2), ix ( 3DT s /5), ix ( 7DT s /10), ix ( 4DT s /5), ix ( 9DT s /10), ix (DT s ) a total of 11 value;
步骤6，将得到的开关频率fs、占空比D、输出电压的平均值Vo以及电容电流的瞬时值ix(0)、ix(DTs/10)、ix(DTs/5)、ix(3DTs/10)、ix(2DTs/5)、ix(DTs/2)、ix(3DTs/5)、ix(7DTs/10)、ix(4DTs/5)、ix(9DTs/10)、ix(DTs)送入电感L以及电容ESR和C计算单元10进行曲线拟合和综合处理，得到Buck变换器中电感L的值以及输出滤波电容当前等效串联电阻ESR和电容C的值，具体的：Step 6, the obtained switching frequency f s , duty cycle D, average value V o of output voltage and instantaneous value of capacitor current i x (0), i x (DT s /10), i x (DT s / 5), ix ( 3DT s /10), ix (2DT s /5), ix (DT s /2), ix ( 3DT s /5), ix ( 7DT s /10), ix (4DT s /5), i x (9DT s /10), i x (DT s ) are sent to the inductance L, capacitance ESR and C calculation unit 10 for curve fitting and comprehensive processing, and the inductance L in the Buck converter is obtained value and the value of the current equivalent series resistance ESR and capacitance C of the output filter capacitor, specifically:
步骤6中所述L、ESR和C计算单元(10)曲线拟合方程如下：Described in step 6, L, ESR and C computing unit (10) curve fitting equation are as follows:
求得X1、X2、X3和iCx(0)后，所述L、ESR和C计算单元(10)对拟合曲线进行综合处理，得到Buck变换器中电感L的值以及输出滤波电容当前等效串联电阻ESR和电容C的值，具体公式如下：After obtaining X 1 , X 2 , X 3 and i Cx (0), the L, ESR and C calculation unit (10) comprehensively processes the fitting curve to obtain the value of the inductance L in the Buck converter and the output filter The value of the current equivalent series resistance ESR and capacitance C of the capacitor, the specific formula is as follows:
式中，L为电感的感值，ESR为等效串联电阻的阻值，C为电容的容值，fs为变换器开关频率，Vo为输出电压平均值，D为变换器的占空比，ESRx为所并联电容的等效串联电阻的阻值，Cx为所并联电容的电容的容值，X1、X2、X3为拟合曲线的参数。In the formula, L is the inductance value of the inductor, ESR is the resistance value of the equivalent series resistance, C is the capacitance value of the capacitor, f s is the switching frequency of the converter, V o is the average value of the output voltage, and D is the duty of the converter ESRx is the resistance value of the equivalent series resistance of the capacitor connected in parallel, Cx is the capacitance value of the capacitor connected in parallel, and X 1 , X 2 , X 3 are the parameters of the fitting curve.
步骤7，电感L以及电容ESR和C计算单元10将所得的电感L以及等效串联电阻ESR和电容C的值送入显示单元11实时显示。In step 7, the calculation unit 10 of the inductance L and the capacitance ESR and C sends the obtained values of the inductance L, the equivalent series resistance ESR and the capacitance C to the display unit 11 for real-time display.
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