48伏电瓶车充电器原理（Charger principle of 48 volt battery car）.docVIP

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48伏电瓶车充电器原理（Charger principle of 48 volt battery car）.doc

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48伏电瓶车充电器原理（Charger principle of 48 volt battery car）

48伏电瓶车充电器原理（Charger principle of 48 volt battery car） At present, the most widely used, is also one of the earliest can directly drive the single end drive MOS FET switch to MC3842. MC3842 in the stable output voltage at the same time, also has the control function of the load current, which is often called the current mode switching power charger for drive, undoubtedly this function has a unique advantage, only a few external components can achieve constant voltage output, and can control the charging current. Especially MC3842 can directly drive the MOS characteristics of FET tube, greatly improve the reliability of the charger can be. Because MC3842 is widely used, this paper introduces its characteristics. MC3842 as the excitation switching power supply of double row 8 foot single ended output driver circuit, the internal function includes a reference voltage regulator, error amplifier, pulse width comparator, latch, oscillator, pulse width modulator (PWM), pulse output driver etc.. MC3842 more similar products, including UC3842, IR3842N, exchangeable SG3842, CM3842 and LM3842 (domestic). Inside the MC3842 block diagram shown in figure 1. Its characteristics are as follows: Single PWM pulse output, current output drivers for 200mA, peak current up to 1A. Start voltage is greater than 16V, the starting current is only 1mA to enter the working state. Enter the working state, the working voltage between 10 ~ 34V, the load current is 15mA. More than the normal working voltage, switching power supply into undervoltage or overvoltage protection, the integrated circuit without driving pulse output. 5V/50mA internal reference voltage source, the partial pressure of 2:1 as the reference voltage sampling. The output of the driving pulse can drive the bipolar transistor, it can also drive the MOS fet. If the drive transistor, should be the base access switch RC cut-off circuit at the same time will be accelerated, the oscillator frequency limit below 40kHz. If the driver M