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1.E_i 的选定从所需的输出电压μ_o,最大负载电流 Imax 和桥式整流电源内阻r_(zn),选定输入电压μ_i,从而可算出所需的输入交流电压值 E_i。内阻 r_(Zn)可由实验确定或估算。这种电路在满载下μ_i,min=μ_o+V_(bcl)+r_(Zn)I_(max),考虑到电网电压波动±10%,故选μ_i=10μ_i,min/9≈(μ_o+0.7+r_(Zn)I_(max))×10/9。故所需的交流输入有效值为 E_=u_i/2~(1/2)。在一般的12英寸晶体管黑白电视机中的稳压电源,μ_o=12伏,C_2=C_1≥2000微法,
1.E_i selected from the required output voltage μ_o, the maximum load current Imax and the bridge rectifier power supply internal resistance r_ (zn), the selected input voltage μ_i, which can be calculated the required input AC voltage value E_i. The internal resistance r_ (Zn) can be experimentally determined or estimated. This circuit is fully loaded μ_i, min = μ_o + V_ (bcl) + r_ (Zn) I_max, taking into account the power grid voltage fluctuations ± 10%, so choose μ_i = 10μ_i, min / 9 ≈ (μ_o + 0.7 + r_ (Zn) I_ (max)) × 10/9. Therefore, the required AC input effective value is E_ = u_i / 2 ~ (1/2). In a typical 12-inch transistor black-and-white TV in the power supply, μ_o = 12 V, C_2 = C_1 ≥ 2000 microfarads,