Single lithium electricity finding power supply circuit ----- MC34063 STEP UP UP CONVERTER

Single lithium electricity finding power supply circuit, MC34063 STEP UP CONVERTER Keywords: Dose Strong Power In the past year, a small liquid crystal monitor (2.5-inch and 3.5-inch) that can be powered by a lithium battery (3.7V, measured value of the measured value) is available, and the search for homemade It has brought convenience. This program is characterized by only one section of the battery, and a smaller case can be used. On the power supply circuit, there is also a set of MC34063 switching power supplies, while + 3.3v is a linear regulator that is easier to do. U1 is a common MC34063 boost, which powers to the LNB via the motherboard. The booster output is not a 15V / 18V voltage adopted by the star. It is a single 11V voltage. The advantage of low voltage to the LNB power supply is that its power consumption can be reduced by about 1/3, and the discharge time of the battery is significantly extended. Q1 is a power field effect tube, and the pressure drop in this circuit is small, and the charge is only 0.1W, so there is no need for a radiator. Q1 and U2 constitute a linear regulator, and its bias is supplied from the + 11V output from the U1. The efficiency of the U1 portion is about 70%, and the efficiency of the Q1 portion is about 90%, and the power conversion efficiency of the program is about 80%. B1 is a lithium battery (including the protective plate), SW1 is a power switch, J1 is the output interface of the power supply, connected to the motherboard. Due to the LNB power supply voltage of this program is 11V, the vertical polarized signal is set and received when the antenna is adjusted. Now all the stars have vertical polarized reception parameters, as long as the vertical signal is adjusted, the horizontal signal is naturally very good. The battery discharge time is estimated that the battery capacity is 1.5 and the LNB current is 0.05a, and the power consumption of the U1 is about 0.25A. The 33V power input current of the motherboard is 0.3a, and the power current of Q1 is also 0.3a, and the power consumption current of the LCD is about 0.15A. The discharge current of the battery is 0.7a, and the discharge time is greater than 2 hours. The LNB power supply on the motherboard is two (+ 15V and + 18V), which. Only the + 11V of this power is connected to the + 15V terminal of the motherboard. Author: Zhang Fengmei

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