Current mode switching regulator configured such that a measuring resistor is not needed to measure the current at an inductor
First Claim
1. A current-mode switching regulator, comprising:
- a first regulating device for voltage regulation and a second regulating device for load current regulation, each of said first and second devices having a first input, a second input, and an output, and whereby said first input of said first regulating device is connected to receive a reference signal and said second input of said first regulating device is connected to receive an output signal of the current-mode switching regulator, as a regulated variable; and
said output of said first regulating device is connected to said first input of said second regulating device;
a power switch connected to said second regulating device and controlled by a control signal of said second regulating device, said power switch having a load path connected between a first supply potential and a second supply potential;
a choke device connected in said load path of said power switch; and
an integrator connected to said choke device and to said second regulating device, said integrator generating a regulating signal by integrating, with respect to time, an inductor voltage dropping across said choke device, said regulating signal mirroring a load current and being coupled, as regulated variable, into said second input of said second regulating device.
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Abstract
The novel current-mode switching regulator does not determine the load current by picking off a measurement voltage at a measuring resistor, as in the conventional prior art. Instead, the voltage drop across the inductor which is required in any case is picked off as the measurement voltage. A regulating signal derived from the load current is determined, by integration with respect to time, with a voltage-controlled current source. The regulating signal is fed back, as a regulated variable, into regulators of the inner control loop. In this way, it is possible to dispense with the measuring resistor. An additional compensation device makes it possible, moreover, to compensate for a regulation deviation in the desired potential of the outer control loop.
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Citations
13 Claims
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1. A current-mode switching regulator, comprising:
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a first regulating device for voltage regulation and a second regulating device for load current regulation, each of said first and second devices having a first input, a second input, and an output, and whereby said first input of said first regulating device is connected to receive a reference signal and said second input of said first regulating device is connected to receive an output signal of the current-mode switching regulator, as a regulated variable; and
said output of said first regulating device is connected to said first input of said second regulating device;
a power switch connected to said second regulating device and controlled by a control signal of said second regulating device, said power switch having a load path connected between a first supply potential and a second supply potential;
a choke device connected in said load path of said power switch; and
an integrator connected to said choke device and to said second regulating device, said integrator generating a regulating signal by integrating, with respect to time, an inductor voltage dropping across said choke device, said regulating signal mirroring a load current and being coupled, as regulated variable, into said second input of said second regulating device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification