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: 2020-11-13
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] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0029] see Figure 1 to Figure 6 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic concept of the present invention, although only the components related to the present invention are shown in the diagrams rather than the number, shape and Dimensional drawing, the shape, quantity and proportion of each component can be changed arbitrarily during actual implementation, and ...
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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 invention relates to the field of DC-DC step-down, in particular to a voltage mode PWM modulation feedforward circuit. Background technique [0002] The power supply is the power support of 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 cannot be discussed; 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] In general, the power supply needs to 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 be detected as an output change first, and then detected by the feedback loop. Correc...
Claims
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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