PWM waveform generation device and method thereof

Patent metadata

Field	Value
Publication number	US-11356085-B2
Application number	US-201816325515-A
Country	US
Kind code	B2
Filing date	Sep 27, 2018
Priority date	Jan 9, 2018
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

The PWM waveform generation device comprises a time-division multiplexing module, wherein the time-division multiplexing module is configured for receiving a first preprocessing signal and a second preprocessing signal output by two system clock sources, performing a first time-division processing on the first preprocessing signal to obtain a first time-division signal, and performing a second time-division processing on the second preprocessing signal to obtain a second time-division signal according to a preset strategy, performing multiplexing processing on the first time-division signal and the second time-division signal to obtain a PWM output signal, wherein an output frequency of the PWM output signal is a default standard clock frequency. The present invention has the advantages that the cycle length of one cycle of a PWM waveform depends on cycles of two preprocessing waveforms and the number of the cycles, such that the output waveform frequency may be calibrated to a desired frequency.

First claim

What is claimed is:

1. A PWM waveform generation device, comprising:
a time-division multiplexing module for receiving a first preprocessing signal and a second preprocessing signal, performing a first time-division processing on the first preprocessing signal to obtain a first time-division signal, and performing a second time-division processing on the second preprocessing signal to obtain a second time-division signal according to a preset strategy, performing multiplexing processing on the first time-division signal and the second time-division signal to obtain a PWM output signal, wherein an output frequency of the PWM output signal is a default standard clock frequency;
the time-division multiplexing module performs the first time-division processing, the second time-division processing and the multiplexing processing by using the following formula:

f
=

x
*

f
1

+

y
*

f
2

x
+
y

,

wherein f represents a cycle length of a waveform corresponding to the PWM output signal;
f 1 represents a cycle length of a waveform corresponding to the first time-division signal;
f 2 represents a cycle length of a waveform corresponding to the second time-division signal;
x represents a cycle number of a waveform corresponding to the first time-division signal; and
y represents a cycle number of a waveform corresponding to the second time-division signal.

2. The PWM waveform generation device as claimed in claim 1 , wherein the time-division multiplexing module is configured to receive the first preprocessing signal output by a first system clock source, and the second preprocessing signal output by a second system clock source.

3. The PWM waveform generation device as claimed in claim 1 , wherein the preset strategy is to obtain the PWM output signal by adjusting the cycle length and the cycle number of the waveform corresponding to the first time-division signal, and the cycle length and the cycle number of the waveform corresponding to the second time-division signal, respectively.

4. A method for generation of a PWM waveform, comprising:
a time-division multiplexing module receiving a first preprocessing signal and a second preprocessing signal output by two system clock sources, performing a first time-division processing on the first preprocessing signal to obtain a first time-division signal, and performing a second time-division processing on the second preprocessing signal to obtain a second time-division signal according to a preset strategy, performing multiplexing processing on the first time-division signal and the second time-division signal to obtain a PWM output signal, wherein an output frequency of the PWM output signal is a default standard clock frequency;
wherein the time-division multiplexing module performs the first time-division processing, the second time-division processing and the multiplexing processing by using the following formula:

f
=

x
*

f
1

+

y
*

f
2

x
+
y

,

wherein f represents a cycle length of a waveform corresponding to the PWM output signal;
f 1 represents a cycle length of a waveform corresponding to the first time-division signal;
f 2 represents a cycle length of a waveform corresponding to the second time-division signal;
x represents a cycle number of a waveform corresponding to the first time-division signal; and
y represents a cycle number of a waveform corresponding to the second time-division signal.

5. The PWM waveform generation device as claimed in claim 4 , wherein the time-division multiplexing module is configured to receive the first preprocessing signal output by a first system clock source, and the second preprocessing signal output by a second system clock source.

6. The PWM waveform generation device as claimed in claim 4 , wherein the preset strategy is to obtain the PWM output signal by adjusting the cycle length and the cycle number of the waveform corresponding to the first time-division signal, and the cycle length and the cycle number of the waveform corresponding to the second time-division signal, respectively.

Assignees

• Amlogic Shanghai Co Ltd

Inventors

• Hu Jian
• Yang Bo
• Zhang Xuhua
• Luo Chaoyang
• Chen Xingyu

Classifications

• H03K7/08 Primary

  Duration or width modulation {; Duty cycle modulation} · CPC title

• H03K7/06 Primary

  Frequency or rate modulation, i.e. PFM or PRM · CPC title

• H04J3/04

  Distributors combined with modulators or demodulators {(pulse distributors in general H03K5/15; pulse counters H03K21/00 - H03K29/06; for telegraphy H04L5/22, H04L13/00 - H04L23/00, H04L25/45; for telephony H04Q11/04)} · CPC title