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As a seniormost member in the group. Asking for suggestions and help just by giving will definetly will not solve your problem. Provide complete detail of your problem so that will be easy to provide suggestions.
I'm giving my suggestions with some assumptions on your one line requirement is use switching regulator as you are going to waste so much power I guess. Decide the switching regulator on basis of the current required in your circuit.
Any cheap and simple method available? since the power is already from smps, its already regulated, a voltage drop method is only required, if its lowered to the range of 30V i can use 7810
That could be Ok but will not solve the problem completely. Also use a power resistor along with the zener diode or else go for the option of pre-regulator.
With a linear regulator:
A zener or a power resistor in series with the input supply makes no difference. Either the heat is dissipated in zener, reistor, or regulator.
It´s all the same power / heat.
Here is a simulation which works on the concept of a charge pump. It can step down the power supply, if adjusted to the proper frequency and duty cycle.
The power supply needs to be at least twice the desired output voltage. This is because C1 only charges to 1/2 of the supply voltage.
A half-bridge drives the charge pump capacitor C1. The load is in the emitter leg. It receives current both when the capacitor is charging and discharging. Efficiency is improved.
Capacitors tend to charge and discharge suddenly in such circuits. This creates spikey current waveforms, hurting efficiency.
I'm not saying this design is optimized. It is one of many designs which try to use capacitors as a counterpart to inductors, while trying to overcome the limitations of capacitors.
Example, see the thread below. It discusses an interesting method of switching two capacitors, in a way that can give you a wide range of output voltages.
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