maychang

czh778439397 posted on 2018-6-17 21:17 I just want to achieve Vo=Vin1*D1+Vin2*D2, when the solar energy decreases, the mains output will automatically increase, when the solar energy increases, the mains output will automatically decrease, ...

If the original poster's design is to use solar energy to power the load when there is light, and charge the battery at the same time, and rely on the battery to power the load when there is no light, then this design is reasonable. The power provided by the battery is more expensive than the power provided by the solar cell. When there is cheap energy, use the cheap one, and when there is no cheap energy, use the expensive one.

maychang

czh778439397 Published on 2018-6-17 21:28 How to use step-down? Please give me some advice!! I have been struggling for a long time, and I am just one step away!

Step-down drive is very simple, as shown in the figure. Rx and Ry are calculated by yourself, and they cannot be too large.

maychang

czh778439397 Published on 2018-6-17 21:28 How to use the voltage reduction? Please give me some advice!! I have been struggling for a long time, and I am just one step away from it!

“I have been struggling for a long time, and I am just one step away from it!” I am afraid that even with this step, there is still a long way to go.

PowerAnts

The OP tinkered around and split a large inductor into two small inductors, each running its own circuit.

czh778439397

maychang posted on 2018-6-18 10:12 The buck driver is very simple, as shown in the figure. Rx and Ry are calculated by yourself, and they cannot be too large.

If connected in this way, Q1 is equivalent to being useless. If the total value of Rx and Ry is not large, the Ic current flowing through the pnp tube below will be very large, and no matter how it is set in simulation, it will be wrong! This power supply is actually equivalent to a solar panel, and the output voltage varies between 4v-18v.

maychang

czh778439397 Published on 2018-6-19 15:41 If connected in this way, Q1 will be useless. If the total value of Rx and Ry is not large, the Ic current flowing through the pnp tube below will be very large. In the simulation...

It seems that the host is determined to use the cheap and reliable AC power as a backup power source at all costs and must use the solar panels.

qwqwqw2088

Why do we need two Buck circuits? And where the MOS tube is driven, Ry is the driver. If the driver is too small, it is easy to produce spikes.

czh778439397

maychang posted on 2018-6-19 16:29 It seems that the OP is determined to use cheap and reliable city electricity as a backup power source at all costs, and must use solar panels.

No, my boss asked me to develop a power supply system that does not require batteries

czh778439397

qwqwqw2088 posted on 2018-6-19 17:55 Why do we need two Buck circuits? And where the MOS tube is driven, Ry is the driver. If the driver is too small, it is easy to produce spikes

Because we need to use two power supplies, these two power supplies cannot be directly connected in series, they must be controlled independently! Or are there other ways to meet this situation?

czh778439397

czh778439397 posted on 2018-6-19 19:31 Because we need to use two power supplies, these two power supplies cannot be directly connected in series, they must be controlled independently! Or if this is the case, are there any other ways?

The real driver should be Rx, in fact Q1 is useless! It doesn't matter whether it is or not!

maychang

czh778439397 Published on 2018-6-19 19:29 No, my boss asked me to develop a power supply system that does not require batteries

My boss asked me to develop a power supply system that does not require batteries. If the city power outage occurs at night, what are you going to do?

czh778439397

maychang posted on 2018-6-19 16:29 It seems that the OP is determined to use cheap and reliable mains electricity as a backup power source at all costs, and must use solar panels.

Why after modifying the circuit diagram, setting V1 to 6v, V2 to 24v, pwm1 to 100%, pwm2 to 25%, the waveform measured at point 1 (marked in the figure) is as shown in the figure! ?

czh778439397

maychang posted on 2018-6-19 19:39 My boss asked me to develop a power supply system that does not require batteries. If the city power outage occurs at night, what are you going to do?

This question left me speechless! , I am only considering this from the perspective of energy saving!