A current-mode DC-to-DC converter operating in a high frequency is disclosed. The current-mode DC-to-DC converter includes an inductor, a power switch, an oscillator, an adder without internal feedback loop, an error amplifier, a comparator, a compensation unit and a driver. The adder adds a ramp si
A current-mode DC-to-DC converter operating in a high frequency is disclosed. The current-mode DC-to-DC converter includes an inductor, a power switch, an oscillator, an adder without internal feedback loop, an error amplifier, a comparator, a compensation unit and a driver. The adder adds a ramp signal from the oscillator directly to a voltage signal relative to a current flowing through the power switch and generates a sum signal based upon match between internal components in the oscillator and the adder.
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What is claimed is: 1. A current-mode converter, comprising: an inductor; a power switch coupled to the inductor, the power switch being capable of providing a voltage signal according to a current flowing through the power switch; an oscillator for generating a ramp signal, wherein the oscillator
What is claimed is: 1. A current-mode converter, comprising: an inductor; a power switch coupled to the inductor, the power switch being capable of providing a voltage signal according to a current flowing through the power switch; an oscillator for generating a ramp signal, wherein the oscillator further comprising, a current source, a capacitor being having an upper plate, the capacitor being charged by the current source, a resistor coupled to the capacitor, a switch coupled to the resistor to control charging and discharging of the capacitor to provide the ramp signal at the upper plate of the capacitor, a plurality of comparators comparing the ramp signal with a plurality of threshold voltages, and a logic unit controlled by the plurality of comparators and capable of generating a pulse signal to control the switch; an adder coupled to the inductor, the adder being capable of adding the ramp signal from the oscillator to the voltage signal and generating a sum signal; an error amplifier for comparing a feedback voltage with a reference voltage and generating an error signal; a comparator for comparing the error signal with the sum signal and generating a pulse-width modulation (PWM) signal; and a driver for receiving the PWM signal and generating a switch control signal to control the power switch and the adder. 2. The current-mode converter of claim 1, further comprising: a feedback circuit for scaling down a DC output voltage and generating the feedback voltage; and a compensation circuit coupled between the feedback circuit and the comparator to provide frequency compensation. 3. The current-mode converter of claim 1, wherein the current-mode converter is a boost converter. 4. The current-mode converter of claim 1, wherein the adder further comprising: a current source, the current source and the current source in the oscillator forming a current mirror; a capacitor having an upper plate, the capacitor being charged by the current source; a resistor coupled to the current source and the capacitor; a plurality of switches coupled to the capacitor, the resistor and the driver for controlling charging and discharging of the capacitor, charging and discharging of the capacitor generating the sum signal at the upper plate of the capacitor; and an inverter coupled to the driver, the inverter controlling one of the plurality of switches. 5. The current-mode converter of claim 4, wherein the capacitor and the resistor in the adder match the capacitor and the resistor in the oscillator respectively. 6. The current-mode converter of claim 4, wherein a voltage difference across the capacitor in the adder is equal to a voltage difference across the capacitor in the oscillator during a transient period. 7. The current-mode converter of claim 1, wherein the current-mode converter is a buck converter. 8. A current-mode buck converter comprising: an inductor; a power switch coupled to the inductor, the power switch being capable of providing a voltage signal according to a current flowing through the power switch; an oscillator for generating a ramp signal, wherein the oscillator further comprising: a current sink; a capacitor being having a lower plate, the capacitor being discharged by the current sink; a resistor coupled to the capacitor; a switch coupled in serial with the resistor to control charging and discharging of the capacitor to provide the ramp signal at the lower plate of the capacitor; a plurality of comparators comparing the ramp signal with a plurality of threshold voltages; and a logic unit being controlled by the plurality of comparators and generating a pulse signal to control the switch; an adder coupled to the inductor, the adder being capable of adding the ramp signal from the oscillator to the voltage signal and generating a sum signal; an error amplifier for comparing a feedback voltage with a reference voltage and generating an error signal; a comparator for comparing the error signal with the sum signal and generating a pulse-width modulation (PWM) signal; and a driver for receiving the PWM signal and generating a switch control signal to control the power switch and the adder. 9. The current-mode buck converter of claim 8, wherein the adder comprising: a current sink, the current sink and the current sink in the oscillator forming a current mirror; a capacitor having a lower plate, the capacitor being discharged by the current sink; a resistor coupled to the current sink and the capacitor; a plurality of switches coupled to the capacitor, the resistor and the driver to control charging and discharging of the capacitor to generate the sum signal at the lower plate of the capacitor; and an inverter coupled to the driver, the inverter controlling one of the plurality of switches. 10. The current-mode converter of claim 9, wherein the capacitor and the resistor in the adder match the capacitor and the resistor in the oscillator respectively. 11. The current-mode converter of claim 9, wherein a voltage difference across the capacitor in the adder is equal to a voltage difference across the capacitor in the oscillator during a transient period. 12. A method for converting a DC input voltage to a DC output voltage, comprising the steps of: (a) receiving the DC input voltage; (b) sensing a current flowing through a power switch according to the DC input voltage; (c) generating a voltage signal according to the sensed current; (d) generating a mirrored current according a predetermined current; (d1) charging a capacitor by the mirrored current under control of a plurality of switches; (d2) discharging the capacitor under control of the plurality of switches; (d3) generating the voltage signal at one plate of the capacitor; (d4) matching a value of the ramp signal to a voltage difference of the capacitor; (d5) adding the voltage difference to the voltage signal based upon the charging and discharging of the capacitor; (e) comparing an addition result with a predetermined error signal; (f) generating a PWM signal according to a comparison result between the error signal and the addition result; (g) converting the PWM signal to a switch control signal; (h) driving the power switch with the switch control signal; (i) controlling the addition of the ramp signal and the voltage signal with the switch control signal; and (j) generating a DC output voltage under control of the power switch. 13. The method of claim 12, further comprising the steps of: generating a feedback voltage proportional to the DC output voltage; comparing the feedback voltage with a reference voltage; and generating the predetermined error signal based upon the comparison. 14. The method of claim 12, further comprising the steps of: generating the ramp signal. 15. The method of claim 14, wherein the step of generating the ramp signal further comprising the steps of: charging a capacitor by a predetermined current when a first switch is turned off; discharging the capacitor when the first switch is turned on; generating the ramp signal according to a voltage difference across the capacitor based upon the charging and discharging of the capacitor; comparing the ramp signal with a plurality of threshold voltages; and generating a control signal to drive the first switch based upon a comparison result. 16. An electronic system comprising: an input device for taking inputs from an user; a controller for performing operations based on the inputs from the user; and a power supply for supplying power to the electronic system, the power supply including a current-mode boost converter, the current-mode converter comprising: an inductor; a power switch coupled to the inductor, the power switch being capable of providing a voltage signal according to a current flowing through the power switch; an oscillator for generating a ramp signal; an adder coupled to the inductor, the adder being capable of adding a ramp signal from the oscillator to the voltage signal and generating a sum signal; an error amplifier for comparing a feedback voltage with a reference voltage and generating an error signal; a comparator for comparing the error signal with the sum signal and generating a pulse-width modulation (PWM) signal; and a driver for receiving the PWM signal and generating a switch control signal to control the power switch and the adder, wherein the adder further comprising, a current source, a capacitor having an upper plate, the capacitor being charged by the current source, a resistor coupled to the current source and the capacitor, a plurality of switches coupled to the capacitor, the resistor and the driver to control charging and discharging of the capacitor to generate the sum signal at the upper plate of the capacitor, and an inverter coupled to the driver, the inverter controlling one of the plurality of switches. 17. An electronic system comprising: an input device for taking inputs from an user; a controller for performing operations based on the inputs from the user; and a power supply for supplying power to the electronic system, the power supply including a current-mode buck converter, the current-mode converter comprising: an inductor; a power switch coupled to the inductor, the power switch being capable of providing a voltage signal according to a current flowing through the power switch; an oscillator for generating a ramp signal; an adder coupled to the inductor, the adder being capable of adding a ramp signal from the oscillator to the voltage signal and generating a sum signal; an error amplifier for comparing a feedback voltage with a reference voltage and generating an error signal; a comparator for comparing the error signal with the sum signal and generating a pulse-width modulation (PWM)signal; and a driver for receiving the PWM signal and generating a switch control signal to control the power switch and the adder, wherein the adder comprising; a current sink; a capacitor having a lower plate, the capacitor being discharged by the current sink; a resistor coupled to the current sink and the capacitor; a plurality of switches coupled to the capacitor, the resistor and the driver to control charging and discharging of the capacitor to generate the sum signal at the lower plate of the capacitor; and an inverter coupled to the driver, the inverter controlling one of the plurality of switches.
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이 특허에 인용된 특허 (5)
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