Hey guys,
I am right now designing a self powered circuit for a project of mine, using generated energy from an ac source to power and operate different circuits. I am using a full wave bridge rectifier circuit to charge a capacitor (schematic is attached). In implementation, I am using a low power ICM7566 timer chip from maxim.
However, when I hooked this circuit up and measured the voltage at the output, I get a very small output reading (see attached image). However, my AC pulse generator is generating an amplitude of 10V. I was at least expecting the 555 timer to give a 5V output pulse (or bigger).
At first I thought it might be high power dissipation from the chip, but I found out from measurement and fellow helpers that power dissipation from CMOS chips are very small by convention (in the μW range- my measurement was even smaller).
Therefore, I am lost as to why this is happening- I imagine there is loading of some sort, and therefore measured the input impedance. However, I found out that its input impedance was 2Mohms, which is relatively high, high enough to not load up the circuit.
by the way, the ground is not at earth ground as seen in the schematic- that 0 gnd was put in so pspice could run the simulation. It is a unified "location", connected to the negative output terminal of the rectifier.
I am using a standard oscilloscope from tektronix for measurement, with probes at 10Mohms impedance applied to it.
Any help and/or suggestions will be greatly appreciated. Thanks!
I am right now designing a self powered circuit for a project of mine, using generated energy from an ac source to power and operate different circuits. I am using a full wave bridge rectifier circuit to charge a capacitor (schematic is attached). In implementation, I am using a low power ICM7566 timer chip from maxim.
However, when I hooked this circuit up and measured the voltage at the output, I get a very small output reading (see attached image). However, my AC pulse generator is generating an amplitude of 10V. I was at least expecting the 555 timer to give a 5V output pulse (or bigger).
At first I thought it might be high power dissipation from the chip, but I found out from measurement and fellow helpers that power dissipation from CMOS chips are very small by convention (in the μW range- my measurement was even smaller).
Therefore, I am lost as to why this is happening- I imagine there is loading of some sort, and therefore measured the input impedance. However, I found out that its input impedance was 2Mohms, which is relatively high, high enough to not load up the circuit.
by the way, the ground is not at earth ground as seen in the schematic- that 0 gnd was put in so pspice could run the simulation. It is a unified "location", connected to the negative output terminal of the rectifier.
I am using a standard oscilloscope from tektronix for measurement, with probes at 10Mohms impedance applied to it.
Any help and/or suggestions will be greatly appreciated. Thanks!
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