TWI559128B - Power supply method for avoiding audio noise and power supply apparatus for avoiding audio noise - Google Patents

Description

Power supply method for avoiding audio noise and power supply device for avoiding audio noise 【0001】

The present invention relates to a power supply method and a power supply device, and more particularly to a power supply method for avoiding audio noise and a power supply device for avoiding audio noise.

【0002】

When the power supply device is in the standby mode or the light load mode, the power supply device enters a burst mode to save energy.

[0003]

Humans can hear sounds between about 20 Hz and 20,000 Hz, which is called audio frequency.

[0004]

When the power supply unit operates in the pulse intermittent mode, it will be very annoying if the pulse frequency of the power supply unit falls within the audio range.

[0005]

In order to improve the above disadvantages of the prior art, it is an object of the present invention to provide a power supply method for avoiding audio noise.

[0006]

In order to improve the above disadvantages of the prior art, it is still another object of the present invention to provide a power supply method for avoiding audio noise.

【0007】

In order to improve the above disadvantages of the prior art, it is still another object of the present invention to provide a power supply device that avoids audio noise.

[0008]

In order to achieve the above object of the present invention, a power supply method for avoiding audio noise of the present invention includes: when a power supply device is in a pulse intermittent mode and a pulse intermittent frequency of the power supply device falls within an audio range, the power supply The supply device leaves the pulse pause mode to avoid audio noise.

【0009】

Furthermore, the power supply method for avoiding audio noise as described above further includes: after the power supply device leaves the pulse intermittent mode, the power supply device enters a normal operation mode.

[0010]

Furthermore, the power supply method for avoiding audio noise as described above, wherein the audio range is between 20 Hz and 20,000 Hz.

[0011]

In order to achieve the above-mentioned other object of the present invention, the power supply method for avoiding audio noise of the present invention comprises: a power supply device entering a pulse intermittent mode; and detecting the power supply after the power supply device enters the pulse intermittent mode A pulse intermittent frequency of the device; and if the pulse intermittent frequency of the power supply device falls within an audio range, the power supply device leaves the pulse intermittent mode to avoid audio noise.

[0012]

Furthermore, the power supply method for avoiding audio noise as described above further includes: after the power supply device leaves the pulse intermittent mode, the power supply device enters a normal operation mode.

[0013]

Furthermore, the power supply method for avoiding audio noise as described above, wherein the audio range is between 20 Hz and 20,000 Hz.

[0014]

In order to achieve the above-mentioned other object of the present invention, the power supply device for avoiding audio noise of the present invention comprises: a voltage input terminal; a power switch circuit electrically connected to the voltage input terminal; and a voltage output terminal The voltage output terminal is electrically connected to the power switch circuit; a pulse width modulation signal generating circuit, the pulse width modulation signal generating circuit is electrically connected to the power switching circuit; and a pulse intermittent frequency detecting circuit, The pulse intermittent frequency detecting circuit is electrically connected to the power switching circuit and the pulse width modulation signal generating circuit. The pulse width modulation signal generating circuit controls the power switching circuit by a pulse width modulation signal, so that the power supply device for avoiding audio noise enters a pulse intermittent mode; and the power supply device for avoiding audio noise enters After the pulse intermittent mode, the pulse intermittent frequency detecting circuit detects a pulse intermittent frequency of the power switching circuit; if the pulse intermittent frequency of the power switching circuit falls within an audio range, the pulse intermittent frequency detecting circuit notifies The pulse width modulation signal generating circuit falls into the audio range; and the pulse intermittent frequency detecting circuit notifies the pulse width modulation signal generating circuit that the pulse intermittent frequency falls within the audio range, and the pulse width is adjusted The variable signal generating circuit controls the power switching circuit by the pulse width modulation signal, so that the power supply device for avoiding audio noise leaves the pulse intermittent mode to avoid audio noise.

[0015]

Furthermore, as described above, the power supply device for avoiding audio noise, wherein an input voltage is transmitted to the power switch circuit through the voltage input terminal; the pulse width modulation signal generating circuit transmits the pulse width modulation signal to the The power switching circuit is configured such that the power switching circuit is controlled by the pulse width modulation signal to convert the input voltage into an output voltage; the power switching circuit outputs the output voltage through the voltage output terminal.

[0016]

Furthermore, the power supply device for avoiding audio noise as described above, wherein the pulse width modulation signal generating circuit is modulated by the pulse width modulation signal after the power supply device for avoiding audio noise leaves the pulse intermittent mode The power switching circuit is controlled such that the power supply device for avoiding audio noise enters a normal operating mode.

[0017]

Furthermore, the power supply device for avoiding audio noise as described above, wherein the audio range is between 20 Hz and 20,000 Hz.

[0018]

The effect of the present invention is that when the power supply device is in the pulse intermittent mode and the pulse intermittent frequency of the power supply device falls within the audio range, the power supply device leaves the pulse intermittent mode to avoid audio noise.

[0049]

Step S02～04

[0050]

Step T02～08

[0051]

Power supply device 10 for avoiding audio noise

[0052]

Voltage input 102

[0053]

Power switch circuit 104

[0054]

Voltage output 106

[0055]

Pulse width modulation signal generating circuit 108

[0056]

Pulse intermittent frequency detecting circuit 110

[0057]

Input voltage 112

[0058]

Pulse width modulation signal 114

[0059]

Output voltage 116

[0019]

1 is a flow chart of a first embodiment of a power supply method for avoiding audio noise according to the present invention.

[0020]

2 is a flow chart of a second embodiment of a power supply method for avoiding audio noise according to the present invention.

[0021]

3 is a block diagram of a power supply device for avoiding audio noise according to the present invention.

[0022]

4 is a waveform diagram of an embodiment of a complex number of the pulse width modulation signal.

[0023]

The detailed description and the technical description of the present invention are to be understood as the

[0024]

Please refer to FIG. 1, which is a flowchart of a first embodiment of a power supply method for avoiding audio noise according to the present invention. The power supply method for avoiding audio noise of the present invention comprises the following steps:

[0025]

S02: when a power supply device is in a burst mode and a burst frequency of the power supply device falls within an audio range, the power supply device leaves the pulse intermittent mode to avoid audio miscellaneous News.

[0026]

S04: After the power supply device leaves the pulse intermittent mode, the power supply device enters a normal working mode.

[0027]

The audio range is between 20 Hz and 20,000 Hz; the normal working mode is detailed later.

[0028]

The effect of the present invention is that when the power supply device is in the pulse intermittent mode and the pulse intermittent frequency of the power supply device falls within the audio range, the power supply device leaves the pulse intermittent mode to avoid audio noise.

[0029]

Please refer to FIG. 2, which is a flow chart of a second embodiment of a power supply method for avoiding audio noise according to the present invention. The power supply method for avoiding audio noise of the present invention comprises the following steps:

[0030]

T02: A power supply device enters a burst mode.

[0031]

T04: After the power supply device enters the pulse intermittent mode, detecting a pulse burst frequency of the power supply device.

[0032]

T06: If the pulse intermittent frequency of the power supply device falls within an audio range, the power supply device leaves the pulse intermittent mode to avoid audio noise.

[0033]

T08: The power supply device enters a normal operation mode after the power supply device leaves the pulse intermittent mode.

[0034]

The audio range is between 20 Hz and 20,000 Hz; the normal working mode is detailed later.

[0035]

The effect of the present invention is that when the power supply device is in the pulse intermittent mode and the pulse intermittent frequency of the power supply device falls within the audio range, the power supply device leaves the pulse intermittent mode to avoid audio noise.

[0036]

Please refer to FIG. 3, which is a block diagram of a power supply device for avoiding audio noise according to the present invention. The power supply device 10 for avoiding audio noise of the present invention comprises a voltage input terminal 102, a power switch circuit 104, a voltage output terminal 106, a pulse width modulation signal generating circuit 108 and a pulse intermittent frequency detecting circuit 110.

[0037]

The power switch circuit 104 is electrically connected to the voltage input terminal 102; the voltage output terminal 106 is electrically connected to the power switch circuit 104; the pulse width modulation signal generation circuit 108 is electrically connected to the power switch circuit 104; The pulse intermittent frequency detecting circuit 110 is electrically connected to the power switching circuit 104 and the pulse width modulation signal generating circuit 108.

[0038]

The pulse width modulation signal generating circuit 108 controls the power switching circuit 104 by a pulse width modulation signal 114, so that the power supply device 10 for avoiding audio noise enters a burst mode; in the audio avoidance mode After the power supply device 10 of the noise enters the pulse intermittent mode, the pulse intermittent frequency detecting circuit 110 detects a pulse burst frequency of the power switch circuit 104; if the pulse intermittent frequency of the power switch circuit 104 When the audio frequency range falls, the pulse intermittent frequency detecting circuit 110 notifies the pulse width modulation signal generating circuit 108 that the pulse intermittent frequency falls into the audio range; and the pulse intermittent frequency detecting circuit 108 notifies the pulse width modulation After the pulse intermittent frequency falls within the audio range, the pulse width modulation signal generating circuit 108 controls the power switching circuit 104 by the pulse width modulation signal 114, so that the power supply device for avoiding audio noise is provided. 10 Leave the pulse pause mode to avoid audio noise.

[0039]

An input voltage 112 is transmitted to the power switch circuit 104 via the voltage input terminal 102; the pulse width modulation signal generating circuit 108 transmits the pulse width modulation signal 114 to the power switch circuit 104 such that the power switch circuit 104 is The pulse width modulation signal 114 is controlled to convert the input voltage 112 into an output voltage 116; the power switching circuit 104 outputs the output voltage 116 via the voltage output 106.

[0040]

After the power supply device 10 for avoiding audio noise leaves the pulse intermittent mode, the pulse width modulation signal generating circuit 108 controls the power switching circuit 104 by the pulse width modulation signal 114 so that the audio noise is avoided. The power supply device 10 enters a normal operating mode.

[0041]

Among them, the audio range is between 20 Hz and 20,000 Hz.

[0042]

Please refer to FIG. 4, which is a waveform diagram of an embodiment of the complex of the pulse width modulation signal. The second waveform from top to bottom, the third waveform from top to bottom, and the fourth waveform from top to bottom, that is, the power supply device 10 representing the avoidance of audio noise, operate in the burst mode. The longer rest time exists between the burst clumps. The frequency at which the bursts appear is called the burst frequency. The output voltage 116 is the pulse quantity and pulse in the burst. The pulse frequency in the group, the pulse duty cycle in the pulse group, and the pulse intermittent frequency are determined.

[0043]

The first waveform from top to bottom means that the power supply device 10 for avoiding audio noise operates in the normal operation mode (that is, the power supply device 10 for avoiding audio noise leaves the pulse intermittent mode), and there is no pulse at this time. The presence of an intermittent frequency, the output voltage 116 is determined by the pulse frequency and the pulse duty cycle.

[0044]

The load corresponding to the fourth waveform from top to bottom is the smallest; the load corresponding to the third waveform from top to bottom is greater than the load corresponding to the fourth waveform from top to bottom; corresponding to the second waveform from top to bottom The load is greater than the load corresponding to the third waveform from top to bottom; the load corresponding to the first waveform from top to bottom is greater than the load corresponding to the second waveform from top to bottom.

[0045]

Generally, if the load is larger, the pulse intermittent frequency is higher. When the pulse intermittent frequency falls within the audio range, the power supply device 10 of the present invention for avoiding audio noise leaves the pulse pause mode and enters the normal operation mode to avoid audio noise.

[0046]

In a specific embodiment, when the power supply device 10 for avoiding audio noise is determined to enter the pulse pause mode (for example, in a standby mode or a light load mode), the pulse intermittent frequency is detected; if the pulse If the intermittent frequency falls within the audio range, the power supply device 10 that avoids audio noise enters the normal working mode to avoid audio noise; if the intermittent frequency does not fall within the audio range, the audio noise is avoided. The power supply device 10 operates in the pulse intermittent mode.

[0047]

The effect of the present invention is to avoid audio noise when the power supply device 10 for avoiding audio noise is in the pulse pause mode and the pulse intermittent frequency of the power supply device 10 for avoiding audio noise falls within the audio range. The power supply device 10 leaves the pulse pause mode to avoid audio noise.

[0048]

However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still be covered by the patent of the present invention. The scope of the scope is intended to protect. The invention may be embodied in various other modifications and changes without departing from the spirit and scope of the inventions. It is intended to fall within the scope of the appended claims. In summary, it is known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has not been seen in similar products and public use, and fully complies with the requirements of the invention patent application, and is filed according to the patent law.

Step S02～04

Claims (10)

[Item 1] A power supply method for avoiding audio noise, comprising:
a. When a power supply device is in a pulse intermittent mode and one of the power supply devices has a pulse intermittent frequency falling within an audio range, the power supply device leaves the pulse intermittent mode to avoid audio noise. [Item 2] The power supply method for avoiding audio noise as described in claim 1 of the patent scope further includes:
b. After the power supply device leaves the pulse intermittent mode, the power supply device enters a normal operating mode. [Item 3] The power supply method for avoiding audio noise as described in claim 1, wherein the audio range is between 20 Hz and 20,000 Hz. [Item 4] A power supply method for avoiding audio noise, comprising:
a. a power supply device enters a pulse intermittent mode;
b. detecting a pulse intermittent frequency of the power supply device after the power supply device enters the pulse intermittent mode; and
c. If the pulse intermittent frequency of the power supply device falls within an audio range, the power supply device leaves the pulse intermittent mode to avoid audio noise. [Item 5] The power supply method for avoiding audio noise as described in claim 4 of the patent scope further includes:
d. After the power supply device leaves the pulse intermittent mode, the power supply device enters a normal operating mode. [Item 6] The power supply method for avoiding audio noise as described in claim 4, wherein the audio range is between 20 Hz and 20,000 Hz. [Item 7] A power supply device for avoiding audio noise, comprising:
a voltage input terminal;
a power switching circuit, the power switching circuit is electrically connected to the voltage input terminal;
a voltage output terminal, the voltage output terminal is electrically connected to the power switch circuit;
a pulse width modulation signal generating circuit electrically connected to the power switching circuit; and a pulse intermittent frequency detecting circuit electrically connected to the power switching circuit And the pulse width modulation signal generating circuit,
The pulse width modulation signal generating circuit controls the power switching circuit by a pulse width modulation signal, so that the power supply device for avoiding audio noise enters a pulse intermittent mode; and the power supply device for avoiding audio noise enters After the pulse intermittent mode, the pulse intermittent frequency detecting circuit detects a pulse intermittent frequency of the power switching circuit; if the pulse intermittent frequency of the power switching circuit falls within an audio range, the pulse intermittent frequency detecting circuit notifies The pulse width modulation signal generating circuit falls into the audio range; and the pulse intermittent frequency detecting circuit notifies the pulse width modulation signal generating circuit that the pulse intermittent frequency falls within the audio range, and the pulse width is adjusted The variable signal generating circuit controls the power switching circuit by the pulse width modulation signal, so that the power supply device for avoiding audio noise leaves the pulse intermittent mode to avoid audio noise. [Item 8] The power supply device for avoiding audio noise according to claim 7, wherein an input voltage is transmitted to the power switch circuit through the voltage input terminal; the pulse width modulation signal generating circuit transmits the pulse width modulation Signaling to the power switching circuit, the power switching circuit is controlled by the pulse width modulation signal to convert the input voltage into an output voltage; the power switching circuit outputs the output voltage through the voltage output terminal. [Item 9] The power supply device for avoiding audio noise according to claim 7, wherein the pulse width modulation signal generating circuit is configured by the pulse width after the power supply device for avoiding audio noise leaves the pulse intermittent mode The modulation signal controls the power switching circuit such that the power supply device that avoids audio noise enters a normal operating mode. [Item 10] A power supply device for avoiding audio noise as described in claim 7 wherein the audio range is between 20 Hz and 20,000 Hz.