Switch controller having a regulating path and an auxiliary regulating path parallel thereto

Claim 2

A switch controller for regulating a DC output voltage, comprising: switching means including a switching transistor feeding a regulating path formed of an inductance and smoothing capacitor; a DC potential at the smoothing capacitor being connected to one input of an amplifier means for amplifying a difference between said DC potential and a prescribed reference voltage at another input; pulse-width modulator means connected to an output of the amplifier means having an output connected to control the switching transistor; an auxiliary regulating path connected in parallel to said regulating path and which has both a low pass filter and a high pass filter; and said auxiliary regulating path having means for effecting a maximum phase rotation of -90° in its phase response.

Claim 3

A switch controller according to claim 1 wherein the auxiliary regulating path is formed of a series connection of a resistor and a capacitor, a voltage potential at a voltage dividing point lying therebetween being connected to the amplifier means.

Claim 4

A switch controller for regulating a DC output voltage, comprising: switching means including a switching transistor feeding a regulating path formed of an inductance and smoothing capacitor; a DC potential at the smoothing capacitor being connected to one input of an amplifier means for amplifying a difference between said DC potential and a prescribed reference voltage at another input; pulse-width modulator means connected to an output of the amplifier means having an output connected to control the switching transistor; an auxiliary regulating path connected in parallel to said regulating path; said auxiliary regulating path having means for effecting a maximum phase rotation of -90° in its phase response; the auxiliary regulating path being formed of a series connection of a resistor and a capacitor, a voltage potential at a voltage dividing point lying therebetween being connected to the amplifier means; and the voltage potential at said voltage dividing point being connected to a further capacitor for DC separation from the following connected amplifier means.

Claim 5

A switch controller for regulating a DC output voltage, comprising: switching means including a switching transistor feeding a regulating path formed of an inductance and smoothing capacitor; a DC potential at the smoothing capacitor being connected to one input of an amplifier means for amplifying a difference between said DC potential and a prescribed reference voltage at another input; pulse-width modulator means connected to an output of the amplifier means having an output connected to control the switching transistor; an auxiliary regulating path connected in parallel to said regulating path; said auxiliary regulating path having means for effecting a maximum phase rotation of -90° in its phase response; the auxiliary regulating path being formed of a series connection of a resistor and a capacitor, a voltage potential at a voltage dividing point lying therebetween being connected to the amplifier means; and the voltage potential at said voltage dividing point being connected to a further capacitor for DC separation from the following connected amplifier means.

Claim 6

A switch controller according to claim 3 wherein the DC potential is connected to the amplifier means via a resistor, and the further capacitor is connected to the amplifier means via a resistor.

Claim 7

A switch controller for regulating a DC output voltage, comprising: switching means including a switching transistor feeding a regulating path formed of an inductance and smoothing capacitor; a DC potential at the smoothing capacitor being connected to one input of an amplifier means for amplifying a difference between said DC potential and a prescribed reference voltage at another input; a pulse-width modulator means connected to an output of the amplifier means for control of the switching transistor; an auxiliary regulating path connected in parallel to said regulating path and which has both a low pass filter and a high pass filter; and said auxiliary regulating path having means providing a frequency response predominating toward high frequencies such that a maximum phase rotation of -90° occurs at said high frequencies, and a frequency response of the regulating path predominating at relatively low frequencies, whereby undesired oscillation via the regulating path is avoided.

Claim 8

A switch controller for regulating a DC output voltage, comprising: switching means including a switching transistor feeding a regulating path formed of an inductance and smoothing capacitor; a DC potential at the smoothing capacitor being connected to one input of an amplifier means for amplifying a difference between said DC potential and a prescribed reference voltage at another input; a pulse-width modulator means connected to an output of the amplifier means for control of the switching transistor; an auxiliary regulating path connected in parallel to said regulating path and which has both a low pass filter and a high pass filter; and said auxiliary regulating path having means providing a frequency response predominating toward high frequencies such that a maximum phase rotation of -90° occurs at said high frequencies, and a frequency response of the regulating path predominating at relatively low frequencies, whereby undesired oscillation via the regulating path is avoided.

Claim 9

A switch controller for regulating a DC output voltage, comprising: switching means including a switching transistor feeding a regulating path formed of an inductance and smoothing capacitor; a DC potential at the smoothing capacitor being connected to one input of an amplifier means for amplifying a difference between said DC potential and a prescribed reference voltage at another input; a pulse-width modulator means connected to an output of the amplifier means for control of the switching transistor; an auxiliary regulating path connected in parallel to said regulating path; said auxiliary regulating path having means providing a frequency response predominating toward high frequencies such that a maximum phase rotation of -90° occurs at said high frequencies, and a frequency response of the regulating path predominating at relatively low frequencies, whereby undesired oscillation via the regulating path is avoided; and the auxiliary regulating path being formed of a delay circuit including a resistor and capacitor, and wherein a product of values of the resistor and capacitor are dimensioned such that a reciprocal value thereof is approximately equal to a resonant frequency of the regulating path.

Claim 10

A switch controller for regulating a DC output voltage, comprising: switching means including a switching transistor feeding a regulating path formed of an inductance and smoothing capacitor; a DC potential at the smoothing capacitor being connected to one input of an amplifier means for amplifying a difference between said DC potential and a prescribed reference voltage at another input; a pulse-width modulator means connected to an output of the amplifier means for control of the switching transistor; an auxiliary regulating path connected in parallel to said regulating path; said auxiliary regulating path having means providing a frequency response predominating toward high frequencies such that a maximum phase rotation of -90° occurs at said high frequencies, and a frequency response of the regulating path predominating at relatively low frequencies, whereby undesired oscillation via the regulating path is avoided; and the auxiliary regulating path being formed of a delay circuit including a resistor and capacitor, and wherein a product of values of the resistor and capacitor are dimensioned such that a reciprocal value thereof is approximately equal to a resonant frequency of the regulating path.