隔离电源模块的特性测量：TVRB1205YMD-6WR3-平芜编程栈

电源隔离模块5V

VRB1205YMD-6WR3

**AD\Test\2026\September\TestTVRB1205YMD.PcbDoc ***

01【隔离电源模块】

一、背景

手边这两块隔离电源，一个是输出单15伏隔离电源模块。另外一个可以输出±12伏的双隔离电源模块对于输出固定5伏电源模块来说，它的输入电压可以从9伏到18伏，下面我们测量一下这个5伏输出电压隔离模块的特性，一方面是它的输入输出关系，另外也就是它的输出电压、电流之间的关系。这样我们可以为之后运用它提供实际的测量数据。

二、测试电路

设计简单的测试电路，将这颗嵌入式隔离电源，通过一个电路板把输入输出引出来，铺设单面PCB适合一分钟制版，一分钟之后得到测试电路板，焊接电路板，使用高压水蒸气清洗电路板进行测试，给电路板首先输入提供12伏的工作电源，静态下工作电流为12.2毫安。测量输出电压为5.054伏，这与它的输出电压标准值是相符合的，下面我们测量一下它的输入、输出电压关系，这样可以知道它的最小输入电压是多少。

三、输入与输出

测量隔离电源输入输出电压之间的关系，将输入电压从0伏逐步过渡到12伏。总共变化100步。测量每个输入电压下输出电压的情况，可以看到，当输入电压超过7.8伏之后，输出便稳定在5伏。该模块技术手册中标识输入电压应该超过9伏，这样可以保证输出能够稳定在5伏的电压下，对于该模块最高输入电压18伏就无法进行测量验证了。

▲ 图3.1 输入输出电源

四、输入负载特性

使用电子负载DL3021，给隔离电源模块增加输出电源负载。设置输入电压为12伏测量输出电流从0~500毫安之间输出电压变化的情况。通过测量结果可以看到。输出电压随着输出电流增加而几乎线性下降，不过这个下降的幅度是非常小的我们可以看到在输出为五百毫安电流的时候它的电压从原来的5.05 49V下降到5.0478V。，电压仅仅变化了7.1毫伏。

通过电源 DH1766 读取隔离电源模块工作电流，随着输出负载电流增加，对应的输入电流也从 13.2mA 增加到271.8mA。

通过测量输入输出电压以及输入电流和输出电流，可以得到输入功率和输出功率的对应关系，可以看到输入功率的增加和输出功率的增加之间，近似一个线性关系，而且比值也接近于一，这也说明隔离电源模块的效率比较高。我们通过输入功率和输入功率之间的比值，可以得到隔离模块的转换效率，可以看到当输出电流越大，输出的转换效率越接近一个常数，大概百分之八十。，这里显示了输出电流从0~1安之间，对应的电源转换效率曲线。

※总结 ※

本文测量了一个6瓦的5伏隔离电源模块的特性，它的输入电压超过7.8伏之后，输出便稳定在5伏，在输入12伏电源下，负载电流超过500毫安之后，电源转换效率便接近于80%。

一、附件

1、测量程序

#!/usr/local/bin/python# -*- coding: gbk -*-#============================================================# TEST3.PY -- by Dr. ZhuoQing 2026-09-01## Note:#============================================================fromheadmimport*idim,vout,iout,vin=tspload('ivload','idim','vout','iout','vin')pin=[i*vfori,vinzip(iout,vin)]pout=[i*vfori,vinzip(idim,vout)]eff=[p1/p2*100forp1,p2inzip(pout,pin)]#------------------------------------------------------------plt.plot(idim,eff,lw=3)plt.xlabel("Output(A)",color="steelblue",fontsize=24)plt.ylabel("Efficient(%)",color="steelblue",fontsize=24)plt.grid(True,which='both',linestyle='--',alpha=0.7)plt.tight_layout()plt.show()exit()#------------------------------------------------------------plt.plot(pin,pout,lw=3)plt.xlabel("Pin(W)",color="steelblue",fontsize=24)plt.ylabel("Pout(W)",color="steelblue",fontsize=24)plt.grid(True,which='both',linestyle='--',alpha=0.7)plt.tight_layout()plt.show()#------------------------------------------------------------# END OF FILE : TEST3.PY#============================================================

#!/usr/local/bin/python# -*- coding: gbk -*-#============================================================# TEST2.PY -- by Dr. ZhuoQing 2026-09-01## Note:#============================================================fromheadmimport*fromtsmodule.tsvisaimport*fromtsmodule.tsstm32import*dm3068open()dl3021open(129)#------------------------------------------------------------idim=linspace(0,1,100)vout=[]iout=[]vin=[]foriinidim:dl3021setcurrent(i)time.sleep(1.5)v=dm3068vdc()vout.append(v)vv=meterval()vin.append(vv[0])ii=dh1766curr1()iout.append(ii)tspsave("ivload",idim=idim,vout=vout,iout=iout,vin=vin)printff(i,v,ii)dl3021setcurrent(0.1)plt.plot(idim,vout,lw=3)plt.xlabel("I(A)",color="steelblue",fontsize=24)plt.ylabel("V(V)",color="steelblue",fontsize=24)plt.grid(True,which='both',linestyle='--',alpha=0.7)plt.tight_layout()plt.show()#------------------------------------------------------------# END OF FILE : TEST2.PY#============================================================

#!/usr/local/bin/python# -*- coding: gbk -*-#============================================================# TEST23.PY -- by Dr. ZhuoQing 2026-09-01## Note:#============================================================fromheadmimport*idim,vout,iout=tspload('ivload','idim','vout','iout')plt.plot(idim,iout,lw=3)plt.xlabel("I(out)",color="steelblue",fontsize=24)plt.ylabel("I(in)",color="steelblue",fontsize=24)plt.grid(True,which='both',linestyle='--',alpha=0.7)plt.tight_layout()plt.show()#------------------------------------------------------------# END OF FILE : TEST23.PY#============================================================

2、测量数据

idim=[0.0000,0.0101,0.0202,0.0303,0.0404,0.0505,0.0606,0.0707,0.0808,0.0909,0.1010,0.1111,0.1212,0.1313,0.1414,0.1515,0.1616,0.1717,0.1818,0.1919,0.2020,0.2121,0.2222,0.2323,0.2424,0.2525,0.2626,0.2727,0.2828,0.2929,0.3030,0.3131,0.3232,0.3333,0.3434,0.3535,0.3636,0.3737,0.3838,0.3939,0.4040,0.4141,0.4242,0.4343,0.4444,0.4545,0.4646,0.4747,0.4848,0.4949,0.5051,0.5152,0.5253,0.5354,0.5455,0.5556,0.5657,0.5758,0.5859,0.5960,0.6061,0.6162,0.6263,0.6364,0.6465,0.6566,0.6667,0.6768,0.6869,0.6970,0.7071,0.7172,0.7273,0.7374,0.7475,0.7576,0.7677,0.7778,0.7879,0.7980,0.8081,0.8182,0.8283,0.8384,0.8485,0.8586,0.8687,0.8788,0.8889,0.8990,0.9091,0.9192,0.9293,0.9394,0.9495,0.9596,0.9697,0.9798,0.9899,1.0000]vout=[5.0549,5.0547,5.0546,5.0544,5.0543,5.0542,5.0540,5.0539,5.0537,5.0536,5.0534,5.0533,5.0531,5.0530,5.0529,5.0527,5.0526,5.0524,5.0523,5.0522,5.0520,5.0519,5.0517,5.0516,5.0514,5.0513,5.0512,5.0510,5.0509,5.0507,5.0506,5.0505,5.0503,5.0502,5.0500,5.0499,5.0497,5.0496,5.0495,5.0493,5.0492,5.0490,5.0489,5.0488,5.0486,5.0485,5.0483,5.0482,5.0481,5.0479,5.0478,5.0476,5.0475,5.0473,5.0471,5.0470,5.0468,5.0467,5.0465,5.0464,5.0463,5.0461,5.0460,5.0458,5.0457,5.0455,5.0454,5.0453,5.0451,5.0450,5.0448,5.0447,5.0446,5.0444,5.0443,5.0441,5.0440,5.0438,5.0437,5.0436,5.0434,5.0433,5.0431,5.0430,5.0428,5.0427,5.0425,5.0424,5.0423,5.0421,5.0420,5.0418,5.0417,5.0415,5.0414,5.0412,5.0411,5.0409,5.0408,5.0406]iout=[0.0124,0.0204,0.0260,0.0305,0.0357,0.0413,0.0468,0.0513,0.0562,0.0611,0.0665,0.0718,0.0771,0.0818,0.0867,0.0910,0.0963,0.1016,0.1076,0.1127,0.1183,0.1232,0.1282,0.1328,0.1374,0.1423,0.1471,0.1530,0.1584,0.1643,0.1695,0.1746,0.1801,0.1849,0.1901,0.1948,0.1998,0.2044,0.2091,0.2149,0.2205,0.2265,0.2319,0.2377,0.2430,0.2481,0.2536,0.2586,0.2639,0.2687,0.2738,0.2783,0.2830,0.2882,0.2939,0.3001,0.3058,0.3119,0.3173,0.3226,0.3284,0.3336,0.3393,0.3445,0.3502,0.3554,0.3606,0.3663,0.3715,0.3773,0.3825,0.3882,0.3936,0.3988,0.4047,0.4100,0.4158,0.4212,0.4270,0.4323,0.4377,0.4436,0.4489,0.4549,0.4604,0.4663,0.4717,0.4772,0.4831,0.4887,0.4947,0.5001,0.5064,0.5120,0.5175,0.5235,0.5292,0.5353,0.5410,0.5472]vin=[11.9870,11.9800,11.9750,11.9710,11.9670,11.9620,11.9570,11.9530,11.9480,11.9450,11.9390,11.9350,11.9300,11.9260,11.9220,11.9180,11.9130,11.9090,11.9040,11.8990,11.8950,11.8900,11.8850,11.8820,11.8770,11.8740,11.8690,11.8640,11.8600,11.8540,11.8500,11.8450,11.8410,11.8360,11.8310,11.8280,11.8230,11.8200,11.8150,11.8100,11.8060,11.8000,11.7950,11.7900,11.7850,11.7810,11.7770,11.7720,11.7680,11.7640,11.7590,11.7550,11.7510,11.7460,11.7410,11.7360,11.7310,11.7250,11.7210,11.7170,11.7120,11.7070,11.7020,11.6970,11.6920,11.6880,11.6830,11.6780,11.6740,11.6690,11.6640,11.6590,11.6540,11.6500,11.6450,11.6400,11.6360,11.6310,11.6260,11.6210,11.6170,11.6110,11.6070,11.6020,11.5960,11.5920,11.5870,11.5820,11.5770,11.5720,11.5670,11.5620,11.5570,11.5520,11.5480,11.5420,11.5380,11.5330,11.5280,11.5220]