A Voltage Mode PWM Modulation Feedforward Circuit
A technology of feedforward circuit and voltage mode, applied in the direction of electrical components, adjusting electrical variables, control/regulation systems, etc., can solve problems such as slow response speed
Active Publication Date: 2021-01-12
SHANGHAI NATLINEAR ELECTRONICS CO LTD
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Problems solved by technology
[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a voltage mode PWM modulation feedforward circuit for solving the problem of slow response speed in the existing voltage mode PWM modulation mode
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[0028]The following describes the implementation of the present invention through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
[0029]SeeFigure 1 to Figure 6 . It should be noted that the illustrations provided in this embodiment only illustrate the basic idea of the present invention in a schematic manner, although the illustrations only show the components related to the present invention instead of the actual implementation of the number, shape and For size drawing, the shape, quantity, and proportion of each component can be changed at will during actual implement...
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The invention provides a voltage-mode PWM modulation feedforward circuit, and the circuit comprises: a sawtooth wave generator which is used for generating a sawtooth wave voltage according to an input voltage, a feedback voltage, and a reference voltage, wherein the feedback voltage is the resistance voltage division of an output voltage; a VCOM reference voltage generator which is used for generating a VCOM reference voltage according to the drain voltage of the power tube related to the output voltage and a reference current, wherein the reference current is a fixed-value current generatedbased on the reference voltage; and a PWM comparator, wherein one input end of the PWM comparator is connected to the output end of the sawtooth wave generator, the other input end of the PWM comparator is connected to the output end of the VCOM reference voltage generator, and the PWM comparator is used for comparing the sawtooth wave voltage with the VCOM reference voltage to generate a pulse control signal to adjust the duty ratio of a PWM signal. According to the voltage mode PWM modulation feedforward circuit provided by the invention, the problem of low response speed of an existing voltage mode PWM modulation mode is solved.
Description
Technical field[0001]The present invention relates to the field of DC-DC step-down, in particular to a voltage mode PWM modulation feedforward circuit.Background technique[0002]Power supply is the power support for electronic equipment in high-tech fields such as modern communications, aerospace, biotechnology, and computers. It is known as the heart of electronic equipment. Without safe and good power, quality and reliability are impossible to talk about; therefore, power supply The industry is becoming the focus of the electronics manufacturing industry. It applies new technologies and develops rapidly from a high starting point.[0003]Under normal circumstances, the power supply must be converted to meet the needs of the electronic system. Most of the existing DC-DC step-down chips are implemented by current mode PWM modulation, because any change in voltage or load in voltage mode PWM modulation must first be detected as an output change, and then the feedback loop Correction, th...
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IPC IPC(8): H03K5/06H02M3/158H02M1/088
CPCH02M1/088H02M3/158H03K5/06
Inventor 霍晓强金楠
Owner SHANGHAI NATLINEAR ELECTRONICS CO LTD