Switching regulator control

Details Switching regulator control Switching regulator control

1980-05-16

1982-02-16

Shoop, William M.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

G05F 156

Patent

active

043161367

ABSTRACT:
In a method for controlling a switching regulator composed of a controllable electronic switch and a transformer, in which the electronic switch forms a series path with the transformer primary, the series path is connected in series between a direct voltage source and a load, and the amplitude of the current flowing through the switch constitutes a criterion for controlling the load voltage, which method includes periodically causing the switch to assume one switching state at regular intervals occurring with a predetermined frequency, comparing the value of a comparison voltage corresponding to the load voltage and having a selected nominal value with a second voltage value, and causing the switch to assume its opposite switching state when a predetermined relation exists between the comparison voltage value and the second voltage value, the second voltage value is defined by the sum of the values of a constant reference voltage, a control voltage which varies as a function of the current induced in the transformer secondary by current through the switch subsequent to closing of the switch and while the switch remains closed and a voltage having a sawtooth waveform and varying between an initial value at the start of each regular interval and a final value at the end of each regular interval, the latter voltages being selected so that the sum of the constant voltage value, the value which the control voltage would have at the end of an interval if the switch were closed during the entire interval, and the final value of the sawtooth voltage is greater than the sum of the nominal value of the comparison voltage and the maximum permissible value of a jump in the comparison voltage corresponding to a maximum acceptable interfering voltage jump in the load voltage, and the sum of the constant voltage value, the value of the control voltage at the start of an interval and the initial value of the sawtooth voltage is less than the difference between the nominal value and the maximum permissible jump value of the comparison voltage.

REFERENCES:
patent: 3368139 (1968-02-01), Wuerflein
patent: 3461377 (1969-08-01), Reese
patent: 4034281 (1977-07-01), Morita et al.
patent: 4132925 (1979-01-01), Schmutzer et al.
"Upgrade your Switches Analytically," Electronic Design 10; May 1978, pp. 108-113.
"On Dual Control Pulse Width Modulators For Stable Operation of Switched Mode Power Supplies," Wissenschaftliche Berichte, Aeg-Telefunken 52 (1979) 5, pp. 243-249.

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