Transient load corrector for switching converters
First Claim
1. A circuit for providing fast transient response for a switching regulator, the circuit being unconnected to any pulse-width modulator of the switching regulator and comprising:
- a first input terminal and a second input terminal for connection to a switching regulator;
a first output terminal and a second output terminal for connection to a load;
a third input terminal for connection to a DC voltage reference or a programmable voltage reference;
a voltage sensor for detecting the value of the output voltage of the switching regulator;
a bi-directional controlled current source for supplying transient current to the load connected to the first and second output terminals, with the bi-directional controlled current source dissipating negligible power in the steady state;
a control circuit for controlling the bi-directional controlled current source according to the amount of deviation of the output voltage from the DC reference or the programmed voltage reference, thereby ensuring the right amount of transient current to be supplied to or sunk from the load.
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Accused Products
Abstract
The fast transient load corrector is a circuit that attaches to the output terminals of a switching converter. Requiring no feedback circuit that interacts with any control parameter of the switching regulator, the fast transient load corrector works independently to improve the transient response of any switching regulator. Effectively the fast transient load corrector combines with the actual load to form a slowly varying composite load which permits the switching converter to maintain a well regulated output voltage or a voltage of pre-defined waveform. The conceptual construction consists of a bi-directional controlled current source and either a voltage sensor or a current sensor. The voltage or current sensor measures the amount of load disturbance and triggers the bi-directional controlled current source to supply transient current to the load. The quantity to be sensed can be the output voltage, the rate of change of the output voltage, or the rate of change of the output current. A practical construction, in the case of voltage sensing, consists of a pair of comparators which determine the deviation of the output voltage from the nominal value and trigger the action of the bi-directional controlled current source to supply transient current to the load. A practical construction, in the case of current sensing, consists of a negative feedback operational amplifier which, with a first-order circuit and sensing resistor, limits the rate of change of the output current and triggers the action of the bi-directional controlled current source to supply transient current to the load.
62 Citations
22 Claims
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1. A circuit for providing fast transient response for a switching regulator, the circuit being unconnected to any pulse-width modulator of the switching regulator and comprising:
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a first input terminal and a second input terminal for connection to a switching regulator; a first output terminal and a second output terminal for connection to a load; a third input terminal for connection to a DC voltage reference or a programmable voltage reference; a voltage sensor for detecting the value of the output voltage of the switching regulator; a bi-directional controlled current source for supplying transient current to the load connected to the first and second output terminals, with the bi-directional controlled current source dissipating negligible power in the steady state; a control circuit for controlling the bi-directional controlled current source according to the amount of deviation of the output voltage from the DC reference or the programmed voltage reference, thereby ensuring the right amount of transient current to be supplied to or sunk from the load. - View Dependent Claims (4, 5)
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2. A circuit for providing fast transient response for a switching regulator, the circuit being unconnected to any pulse-width modulator of the switching regulator and comprising:
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a first input terminal and a second input terminal for connection to a switching regulator; a first output terminal and a second output terminal for connection to a load; a voltage sensor for detecting the rate of change of the output voltage of the switching regulator; a bi-directional controlled current source for supplying transient current to the load connected to the first and second output terminals, with the bi-directional controlled current source dissipating negligible power in the steady state; a control circuit for controlling the bi-directional controlled current source according to the fluctuation of the output voltage measured by the voltage sensor, thereby ensuring the right amount of transient current to be supplied to or sunk from the load. - View Dependent Claims (6, 7)
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3. A circuit for providing fast transient response for a switching regulator, the circuit being unconnected to any pulse-width modulator of the switching regulator and comprising:
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a first input terminal and a second input terminal for connection to a switching regulator; a first output terminal and a second output terminal for connection to a load; a current sensor for detecting the rate of change of the output current of the switching regulator; a bi-directional controlled current source for supplying transient current to the load connected to the first and second output terminals, with the bi-directional controlled current source dissipating negligible power in the steady state; a control circuit for controlling the bi-directional controlled current source according to the fluctuation of the output current measured by the current sensor, thereby ensuring the right amount of transient current to be supplied to or sunk from the load; a filter network for limiting the rate of change of the output current, the bandwidth of which being wide enough to permit the output current to vary in accordance with the output voltage waveform. - View Dependent Claims (8, 9, 10)
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11. A circuit for providing fast transient response for a the switching regulator, the circuit being unconnected to any pulse-width modulator of the switching regulator and comprising:
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a first input terminal and a second input terminal for connection to a switching regulator; a first output terminal and a second output terminal for connection to a load; a voltage sensor for detecting the variation of the output voltage of the switching regulator; a current source for supplying transient current to and a current sink for sinking transient current from the load that is connected to the first and second output terminals, with both current source and sink dissipating negligible power in the steady state; a control circuit for controlling the current source and the current sink, according to the variation of the output voltage, thereby ensuring the right amount of transient current to be supplied to or sunk from the load; a third input terminal connecting to a DC voltage source for maintaining functioning power of the circuit and a plurality of DC reference voltages. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A circuit for providing fast transient response for a switching regulator, the circuit being unconnected to any pulse-width modulator of the switching regulator and comprising:
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a first input terminal and a second input terminal for connection to a switching regulator; a first output terminal and a second output terminal for connection to a load; a current sensor for detecting the variation of the output current of the switching regulator; a current source for supplying transient current to and a current sink for sinking transient current from the load that is connected to the first and second output terminals, with both current source and sink dissipating negligible power in the steady state; a control circuit for controlling the current source and the current sink according to the variation of the output current, thereby ensuring the right amount of transient current to be supplied to or sunk from the load; a third input terminal connecting to a DC voltage source for maintaining functioning power of the circuit. - View Dependent Claims (20, 21, 22)
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Specification