Switching regulator
First Claim
1. A switching regulator comprising:
- a first switch, having an input, an output and a control line;
a low pass filter connected to an output of the regulator;
a first voltage feedback loop from an output of the regulator to the control line of the switch, wherein the feedback loop includes a comparator having an output, a first input connected to the output of the regulator, and a reference voltage input, the feedback loop further including a frequency reference connected to the control line of the switch for regulating the switching of the switch; and
a second feedback loop from the output of the regulator, the second feedback loop including an amplifier having a DC voltage input, and an output which is connected to the reference voltage input of the comparator.
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Accused Products
Abstract
A switching regulator and a method of regulating voltage by means of a switching regulator, includes a regulator switch, a smoothing filter, and a first voltage feedback loop from an output of he regulator to a control line of the switch. The first feedback loop may include a hysteresis comparator or a comparator and a frequency reference connected to the control line of the switch. The first feedback loop uses the A.C. ripples at the output of the smoothing filter as a ramp signal feedback to substantially instantaneously correct output voltage. A second voltage feedback is further employed to stabilize the output voltage. The smoothing filter employs an LC circuit and the regulator is provided with means for providing an inductor current path when the switch is opened. The regulator may, further, include a current feedback loop.
146 Citations
28 Claims
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1. A switching regulator comprising:
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a first switch, having an input, an output and a control line; a low pass filter connected to an output of the regulator; a first voltage feedback loop from an output of the regulator to the control line of the switch, wherein the feedback loop includes a comparator having an output, a first input connected to the output of the regulator, and a reference voltage input, the feedback loop further including a frequency reference connected to the control line of the switch for regulating the switching of the switch; and a second feedback loop from the output of the regulator, the second feedback loop including an amplifier having a DC voltage input, and an output which is connected to the reference voltage input of the comparator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A switching regulator comprising:
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a first switch having an input, an output and a control line; a low pass filter connected to an output of the regulator; a first voltage feedback from an output of the regulator to the control line of the switch, including a comparator having first and second inputs, and an output which is connected to the control line of the switch, the first voltage feedback being AC coupled to the second input of said comparator; and a second, voltage feedback from the output of the regulator, wherein the second, voltage feedback includes an amplifier having a reference voltage input and an output connected to the first input of the comparator. - View Dependent Claims (8)
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9. A switching regulator for supplying a stable output voltage to an output terminal from a supplied input source, comprising:
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a switch selectively switching the input source to an output terminal thereof to form a modulated switch output under control of a control line, the modulated switch output being composed of a D.C. offset voltage with a superimposed ripple voltage; a low pass filter connected between the output of said switch and the output terminal of said regulator and smoothing the modulated switch output to develop said output voltage; a pulse modulator supplying a pulse train to the control line of said switch to selectively connect said switch; a first voltage feedback loop comparing the D.C. output voltage of said switching regulator to a desired voltage reference to develop a voltage error signal; and a second voltage feedback loop, operatively connected to said pulse modulator and supplying the ripple voltage to said pulse modulator; said pulse modulator varying the duty cycle of said switch based on said ripple voltage to quickly control the output voltage of said switching regulator; variations in the load or voltage of said output developing a substantially instantaneous variation in said ripple voltage to stabilize said output voltage by quickly correct errors sensed therein. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of converting an input voltage into a stable output voltage supplied to an output terminal from a supplied input source, comprising:
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a) selectively switching the input source to form a modulated switch output composed of a D.C. offset voltage with a superimposed ripple voltage using a switch having a pulse modulatable control line; b) smoothing the modulated switch output to develop said output voltage; c) supplying a pulse train to the control line of said switch to selectively connect said switch; d) comparing the D.C. output voltage to a desired voltage reference to develop a voltage error signal in a first voltage feedback loop; and e) supplying the ripple voltage to said pulse modulator in a second voltage feedback loop to aid in the development of said pulse train; said step c) of supplying varying the duty cycle of said switch based on said ripple voltage to quickly control the output voltage of said switching regulator; variations in the load or voltage of said output developing a substantially instantaneous variation in said ripple voltage to stabilize said output voltage by quickly correcting errors sensed therein. - View Dependent Claims (25, 26, 27, 28)
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Specification