Open loop series regulated power supply
AssigneeMotorola, Inc.
InventorReuben Wechsler
Life of this patent
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Abstract
Two AC-DC regulator circuits are disclosed which are suitable for providing a constant minimal ripple DC supply voltage in response to AC line voltages having varying peak amplitudes. Each of the regulator circuits includes a sensing and a trigger pulse circuit which operates in cooperation with a current control circuit to maintain a predetermined constant DC load supply voltage. Moreover, undesirable transient trigger signals, due to initiation or termination of the AC line voltage, are discriminated against providing circuit protection to the applicable load to be used. The regulator circuits are suitable for operation in environments that may be encountered in worldwide applications, i.e., power distributions that may vary from 90 upwards to 250 volts with frequencies of 50 hertz to 60 hertz.
Claims14
An alternating current voltage to direct current voltage regulator circuit suitable for providing a constant direct current regulated output voltage at output terminals thereof in response to an input alternating current voltage of varying peak-to-peak amplitudes applied to input terminals comprising:
- voltage reference means receiving the alternating current voltage and providing a gating reference voltage;
- gating means connected to said voltage reference means and to the alternating current voltage and receiving said gating reference voltage and developing a triggering signal;
- regulator means connected to said gating means and receiving said triggering signal and the alternating current voltage for deriving a regulated and constant direct current voltage at said output terminals thereof;
- said triggering signal occuring at substantially a constant magnitude of said alternating circuit voltage.
The alternating current voltage to direct current voltage regulator circuit of claim 11 wherein said gating means includes in combination:
- first electron control means having first and second electrodes;
- second electron control means having first, second and third electrodes, said first electrode being connected to one of said input terminals of said regulator circuit said second electrode being connected to said second electrode of said first electron control means;
- first circuit means coupling said gating reference voltage to said first electrode of said first electron control means;
- second circuit means also connecting said gating reference voltage to said second electrode of said second electron control means;
- third electron control means having first and second electrodes, said first electrode being connected to said second electrode of said second electron control means, said second electrode being connected to said first electrode of said second electron control means;
- and
- third circuit means coupling the alternating current voltage from the other of said input terminals to said third electrode of said second electron control means.
An open loop regulator circuit suitable for providing a substantially constant output voltage to a load at output terminals thereof in response to an alternating power signal being applied at input terminals, said alternating power signal having peak amplitudes which may vary in magnitude, said regulator circuit comprising:
- means responsive to said applied alternating power signal for providing a triggering signal at an output terminal thereof of a predetermined and substantially constant voltage magnitude of said alternating power signal, said triggering signal occurring during the portion of the cycle of said alternating power signal having a negative slope;
- first capacitive means having first and second terminals, said first terminal being coupled to one of said input terminals and one of said output terminal of said regulator circuit, said second terminal being connected to the other of said output terminals of said regulator circuit;
- and
- means responsive to said triggering signal for charging said capacitive means such that a predetermined and substantially constant voltage is maintained across said capacitive means to permit a constant voltage to be applied to said load, said charging means being connected between said second terminal of said capacitive means and the other of said input terminals of said regulator circuit.
Dependencies are inferred from the claim text.