Triangular carrier slope random distribution pulse width modulation circuit

A triangular carrier and pulse width modulation technology, applied in pulse duration/width modulation, electrical components, output power conversion devices, etc., can solve problems such as dispersing harmonic energy

Active Publication Date: 2017-03-22
NAVAL UNIV OF ENG PLA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the pulse width modulation output voltage with a fixed carrier frequency has a harmonic with a large amplitude at the carrier frequency and its multiplier, and propos

Method used

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  • Triangular carrier slope random distribution pulse width modulation circuit
  • Triangular carrier slope random distribution pulse width modulation circuit
  • Triangular carrier slope random distribution pulse width modulation circuit

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Embodiment Construction

[0054] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] Such as Figure 4 As shown, a pulse width modulation circuit with random distribution of triangular carrier slope in the present invention is realized by FPGA and includes a system clock module 1-1, a counter module 1-2, a Rom module 1-3 and a random triangular carrier processing module 1-4. The system clock module 1-1 outputs the main frequency f (for example, when 50MHz, the minimum time of system counting is 0.02 microseconds), the clocks of the counter module 1-2, the Rom module 1-3 and the random carrier processing module 1-4 are all consistent with the system clock 1-1 connected, the counter module 1-2 receives the system clock signal sent by the system clock module 1-1 to count, and outputs the count to the Rom module 1-3, and the Rom module 1-3 takes the count as the address and takes it out from the Rom Stored random ...

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Abstract

The present invention discloses a triangular carrier slope random distribution pulse width modulation circuit. The circuit comprises a system clock module, a counter module, a Rom module and a random triangular carrier processing module. The system clock module is configured for system clock signals; the counter module is configured to output the count according to the real-time system clock signals; the Rom module is configured to take the count as an address, take out stored random data [Delta]i and transmit the random data [Delta]I to the random triangular carrier processing module; and the random triangular carrier processing module is configured to generate the random triangular carrier according to the random data [Delta]I and output the random triangular carrier to a modulation main circuit. The triangular carrier slope random distribution pulse width modulation circuit can reduce the electromagnetic interference in an electric system from the source and reduce the mechanical vibration and the noise in the condition that the pulse width modulation main circuit topology is not changed so as to provide a new way for effectively solve the electromagnetic interference problem in the electric system and the vibration noise problem at the external portion of the system; and moreover, the vibration and noise reduction does not rely on an additional device so as to reduce the filtering and vibration cost and save the system resource.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and specifically refers to a pulse width modulation circuit with random distribution of triangular carrier slope. Background technique [0002] In power electronics technology, pulse width modulation technology with fixed carrier frequency has been widely used. Based on the equivalent principle of volt-second balance, this technology determines the duty cycle by controlling the on-off of the switching device to modulate different waveforms, but the output voltage has large-amplitude harmonics at the carrier frequency and its multiplier, which is harmful to power The harm of the system is very extensive: for the system, these harmonics are the main source of electromagnetic interference, and the harmonics reduce the electromagnetic compatibility quality of the system, and even affect the normal operation of other devices and equipment in the system in severe cases; for the load , harmon...

Claims

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Application Information

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IPC IPC(8): H03K7/08H02M1/12
CPCH02M1/12H03K7/08
Inventor 许杰聂子玲朱俊杰李长乐胡风革张银峰李华玉韩一孙军
Owner NAVAL UNIV OF ENG PLA
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