Design method and circuit of a serial port multi-stage charging and discharging power supply
A charging and discharging power supply, charging power supply technology, applied in the direction of electrical digital data processing, instruments, etc., can solve the problems of affecting circuit start-up, long charging time, and inability to obtain power from serial ports, etc., to achieve improved efficiency, improved performance, and low power consumption Effect
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Embodiment 1
[0115] Embodiment 1: A secondary power supply based on the TxD terminal of RS232
[0116] 1. Structure Description
[0117] figure 1 It is a schematic diagram of the multi-stage charging and discharging power supply of the present invention.
[0118] Among them, 101 is the charging circuit, that is, the serial port power-taking circuit, its input is the output terminal of the serial port, and the voltage is U 01 , unipolar or positive and negative bipolar pulses. The output voltage is DC V0, which is sent to circuit 1 and circuit 2 for charging. Circuit 1 outputs regulated voltage V1 from P3, and outputs switching signal K1 from P5 to control circuit 2. Before the charging of capacitor C1 of circuit 1 is completed, K1=0, and the charging of circuit 2 is turned off. After C1 is charged, P3 terminal When the stable voltage value V1 is reached, K1=1 at this time, the charging of the circuit 2 is started. Circuit 2 outputs V2 from P8 as the backup voltage of circuit 1, which ...
Embodiment 2
[0207] Embodiment 2: Three-level power supply based on RS232 TxD terminal with long-life battery
[0208] This embodiment is another application of the present invention—a three-stage power supply based on the RS232 TxD terminal with a long-life battery. Compared with the previous embodiment, the similarities will not be repeated, and the differences are:
[0209] image 3 is a structural diagram of this embodiment.
[0210] In this embodiment, a three-level power supply is used, and the introduction of such image 3 In the circuit 3 of 303, in addition, a long-life battery of 309 is introduced, and the long-life battery includes a non-rechargeable battery and a rechargeable battery. The specific differences are as follows:
[0211] In terms of specific design methods:
[0212] 1. Including but not limited to third-pole power supply.
[0213] Such as image 3 In the circuit 3, its PA terminal accepts the charging of V0, and the output voltage V3 generated is sent to the ...
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