Reduced-voltage DC-DC (Direct Current-Direct Current) converter with current mode frequency compensating device
A technology of DC-DC and frequency compensation, which is applied in the direction of DC power input conversion to DC power output, output power conversion device, and adjustment of electric variables, etc. It can solve the problems of slow dynamic response, enlarged circuit, and large compensation capacitors. Integration and other issues, to achieve the effect of increasing the output current, saving area, and speeding up the charging and discharging speed
Active Publication Date: 2015-02-18
WUHAN UNIV
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Problems solved by technology
[0026] The present invention mainly solves the problem that the large compensation capacitors in the prior art cannot be integrated, which increases the area of the entire circuit, and the large compensation capacitors directly reduced Therefore, the dynamic response speed of the system is very slow and other technical problems; it provides a step-down DC-type with a current mode frequency compensation device that saves the area of the entire circuit and improves the dynamic response speed of the system. DC converter
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[0047] Such as figure 1 Shown is a schematic structural diagram of a current mode DC-DC converter, the DC-DC converter includes a power switch tube, a filter circuit unit, a resistor feedback network, a current detection unit, a frequency compensation device, a PWM modulator, and a logic control and Drive circuit. The power switch tube is connected to the input power supply terminal and the logic control and drive circuit, the storage inductor L is connected in parallel to the output filter capacitor Co, the storage inductor L and the output filter capacitor form a filter circuit unit, and the output voltage terminal is connected to the filter unit circuit and resistor feedback network, the feedback voltage of the resistor feedback network is connected to the inverting input terminal of the frequency compensation device, the reference voltage is connected to the non-inverting input terminal of the frequency compensation device, the inverting terminal of the PWM modulator is co...
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The invention relates to a reduced-voltage DC-DC (Direct Current-Direct Current) converter, in particular to the reduced-voltage DC-DC converter with a current mode frequency compensating device. The reduced-voltage DC-DC converter with the current mode frequency compensating device comprises a frequency compensating device, and is characterized in that: the frequency compensating device comprises an error amplifier and a compensating module. Therefore, the reduced-voltage DC-DC converter with the current mode frequency compensating device has the advantages that: 1, the area of the entire circuit is saved, and the dynamic response speed of the system is increased; and 2, the output current of the error amplifier is increased, so that the charging and discharging speeds of a compensation capacitor are increased.
Description
technical field [0001] The invention relates to a step-down DC-DC converter, in particular to a step-down DC-DC converter with a current mode frequency compensation device. Background technique [0002] With the rapid development of electronic technology, portable products such as MP4, mobile phones, PSP, notebook computers, etc. have more and more functions, and in these portable products, the power supply is the heart of power, and power management technology has become a must in portable electronic products. Indispensable technology. At the same time, portable electronic products also require a power supply that provides energy for them to have a smaller volume. [0003] Traditional switching power supplies are usually designed to have a fixed output voltage, such a power supply can make the system work the longest and the battery life is longer. With the increase of consumer electronic products, the switching power supply output variable voltage, fast transient respons...
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IPC IPC(8): H02M3/158
Inventor 江金光汪家轲
Owner WUHAN UNIV