CN106208671A - Power supply method and power supply device for avoiding audio noise - Google Patents

Abstract

A power supply method and a power supply device for avoiding audio noise, the power supply device for avoiding audio noise comprises a voltage input terminal, a power switch circuit, a voltage output terminal, a pulse width modulation signal generating circuit and a pulse pause frequency detecting circuit. The pulse width modulation signal generating circuit controls the power switch circuit by a pulse width modulation signal, so that the power supply device for avoiding audio noise enters a pulse pause mode; the pulse intermittent frequency detection circuit detects a pulse intermittent frequency of the power switch circuit; if the burst frequency falls within an audio frequency range, the burst frequency detection circuit informs the PWM signal generation circuit that the burst frequency falls within the audio frequency range; the power supply device for preventing audio noise leaves the burst mode to prevent audio noise.

Description

Power supply method and power supply device for avoiding audio noise

technical field

The invention relates to a power supply method and a power supply device, in particular to a power supply method for avoiding audio noise (noise) and a power supply device for avoiding audio noise.

Background technique

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

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

When the power supply is operating in burst mode, it can be very annoying if the burst frequency of the power supply falls into the audio frequency range.

Contents of the invention

In order to improve the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a power supply method that avoids audio noise.

In order to improve the above-mentioned shortcomings of the prior art, another object of the present invention is to provide a power supply method that avoids audio noise.

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

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

Furthermore, the above-mentioned power supply method for avoiding audio noise further includes: after the power supply device leaves the burst mode, the power supply device enters a normal working mode.

Furthermore, in the above-mentioned power supply method for avoiding audio noise, the audio frequency range is between 20 Hz and 20,000 Hz.

In order to achieve the above-mentioned still another object of the present invention, the power supply method for avoiding audio noise of the present invention includes: a power supply device enters a pulse intermittent mode; after the power supply device enters the pulse intermittent mode, detect the power supply device and if the burst frequency of the power supply device falls within an audio frequency range, the power supply device leaves the burst mode to avoid audio noise.

Furthermore, the above-mentioned power supply method for avoiding audio noise further includes: after the power supply device leaves the burst mode, the power supply device enters a normal working mode.

Furthermore, in the above-mentioned power supply method for avoiding audio noise, the audio frequency range is between 20 Hz and 20,000 Hz.

In order to achieve the above-mentioned another object of the present invention, the power supply device for avoiding audio noise of the present invention includes: a voltage input terminal; a power switch circuit, the power switch 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 generation circuit, the pulse width modulation signal generation circuit is electrically connected to the power switch circuit; and a pulse intermittent frequency detection circuit, the pulse The intermittent frequency detection circuit is electrically connected to the power switch circuit and the pulse width modulation signal generation circuit. Wherein the pulse width modulation signal generation circuit controls the power switch circuit by a pulse width modulation signal, so that the power supply device for avoiding audio noise enters a pulse intermittent mode; when the power supply device for avoiding audio noise enters After the burst mode, the burst frequency detection circuit detects a burst frequency of the power switch circuit; if the burst frequency of the power switch circuit falls into an audio frequency range, the burst frequency detection circuit notifies the pulse width The intermittent pulse frequency of the modulated signal generation circuit falls within the audio frequency range; after the intermittent pulse frequency detection circuit notifies the pulse width modulation signal generation circuit that the intermittent pulse frequency falls within the audio frequency range, the pulse width modulation signal generation circuit The power switch circuit is controlled by the pulse width modulation signal, so that the power supply device for avoiding audio noise leaves the burst mode for avoiding audio noise.

Furthermore, in the above-mentioned power supply device for avoiding audio noise, 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 A power switch circuit, such that the power switch circuit is controlled by the pulse width modulation signal to convert the input voltage into an output voltage; the power switch circuit outputs the output voltage through the voltage output terminal.

Furthermore, in the power supply device for avoiding audio noise as described above, after the power supply device for avoiding audio noise leaves the intermittent pulse mode, the pulse width modulation signal generation circuit uses the pulse width modulation signal The power switch circuit is controlled so that the audio noise-avoiding power supply device enters a normal working mode.

Furthermore, in the above-mentioned power supply device for avoiding audio noise, the audio frequency range is between 20 Hz and 20,000 Hz.

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

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

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

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

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

FIG. 4 is a waveform diagram of multiple embodiments of the pulse width modulation signal.

Among them, reference signs

Step S02～04

Step T02～08

Power supply device 10 avoiding audio noise

Voltage input terminal 102

Power switch circuit 104

Voltage output terminal 106

Pulse Width Modulation Signal Generation Circuit 108

Intermittent pulse frequency detection circuit 110

Input voltage 112

PWM signal 114

Output voltage 116

detailed description

For the detailed description and technical content of the present invention, please refer to the following detailed description and accompanying drawings as follows, and the accompanying drawings and detailed description are for illustration purposes only, and are not intended to limit the present invention.

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

S02: When a power supply device is in a burst mode and a burst frequency of the power supply device falls into an audio frequency range, the power supply device leaves the burst mode to avoid audio noise News.

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

Wherein, the audio range is between 20 Hz and 20,000 Hz; the normal working mode will be described in detail later.

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

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

T02: A power supply device enters a burst mode.

T04: After the power supply device enters the burst mode, detect a burst frequency of the power supply device.

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

T08: After the power supply device leaves the burst mode, the power supply device enters a normal working mode.

Wherein, the audio range is between 20 Hz and 20,000 Hz; the normal working mode will be described in detail later.

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

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

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 generating circuit 108 is electrically connected to the power switch circuit 104; The burst frequency detection circuit 110 is electrically connected to the power switch circuit 104 and the pulse width modulation signal generation circuit 108 .

The pulse width modulation signal generation circuit 108 controls the power switch circuit 104 by a pulse width modulation signal 114, so that the power supply device 10 for avoiding audio noise enters a burst mode (burst mode); After the noise power supply device 10 enters the burst mode, the burst frequency detection circuit 110 detects a burst frequency (burst frequency) of the power switch circuit 104; if the burst frequency of the power switch circuit 104 falls within an audio frequency range, then the pulse intermittent frequency detection circuit 110 notifies the pulse width modulation signal generating circuit 108 that the pulse intermittent frequency falls within the audio range; the pulse intermittent frequency detection circuit 108 notifies the pulse width modulation signal generating circuit 108 After the intermittent pulse frequency falls into the audio frequency range, the pulse width modulation signal generating circuit 108 controls the power switch circuit 104 through the pulse width modulation signal 114, so that the power supply device 10 for avoiding audio noise leaves the pulse Intermittent mode to avoid audio noise.

An input voltage 112 is transmitted to the power switch circuit 104 through 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, so that the power switch circuit 104 is The PWM signal 114 is controlled to convert the input voltage 112 into an output voltage 116 ; the power switch circuit 104 outputs the output voltage 116 through the voltage output terminal 106 .

After the power supply device 10 for avoiding audio noise leaves the burst mode, the pulse width modulation signal generating circuit 108 controls the power switch circuit 104 through the pulse width modulation signal 114, so that the audio noise avoiding The power supply device 10 enters into a normal working mode.

Wherein, the audio range is between 20 Hz and 20,000 Hz.

Please refer to FIG. 4 , which is a waveform diagram of multiple embodiments of the PWM signal. The second waveform from top to bottom, the third waveform from top to bottom, and the fourth waveform from top to bottom represent that the power supply device 10 for avoiding audio noise is working in the burst mode, A longer rest time exists between burst clumps. The frequency at which burst clumps appear is called burst frequency. The output voltage 116 is determined by the pulse quantity in the burst clump, the pulse quantity It is determined by the pulse frequency in the pulse group, the pulse duty cycle in the pulse group and the intermittent pulse frequency.

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

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; the load corresponding to the second waveform from top to bottom The load corresponding to the third waveform from top to bottom 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.

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

In a specific embodiment, when the power supply device 10 for avoiding audio noise is determined to enter the burst mode (for example, in a standby mode or a light load mode), the burst frequency is detected; if the burst If the frequency falls within the audio frequency range, the power supply device 10 for avoiding audio noise enters the normal operating mode to avoid audio noise; The power supply device 10 works in the burst mode.

The effect of the present invention is that when the power supply device 10 for avoiding audio noise is in the burst mode and the burst frequency of the power supply device 10 for avoiding audio noise falls within the audio frequency range, the audio noise avoidance The power supply device 10 leaves the burst mode to avoid audio noise.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. the power supply method avoiding audio frequency noise, it is characterised in that comprise:

A. when a power supply device is at a pulse interval pattern and a pulse interval of this power supply device When frequency falls into an audiorange, this power supply device leaves this pulse interval pattern to avoid audio frequency miscellaneous News.

The power supply method avoiding audio frequency noise the most according to claim 1, it is characterised in that Further include:

B., after this power supply device leaves this pulse interval pattern, this power supply device enters one Normal mode of operation.

The power supply method avoiding audio frequency noise the most according to claim 1, it is characterised in that This audiorange is between 20 hertz to 20,000 hertz.

4. the power supply method avoiding audio frequency noise, it is characterised in that comprise:

A. a power supply device enters a pulse interval pattern；

B., after this power supply device enters this pulse interval pattern, this power supply device is detected One pulse interval frequency；And

If c. this pulse interval frequency of this power supply device falls into an audiorange, then this power supply supplies Device is answered to leave this pulse interval pattern to avoid audio frequency noise.

The power supply method avoiding audio frequency noise the most according to claim 4, it is characterised in that Further include:

D., after this power supply device leaves this pulse interval pattern, this power supply device enters one Normal mode of operation.

The power supply method avoiding audio frequency noise the most according to claim 4, it is characterised in that This audiorange is between 20 hertz to 20,000 hertz.

7. the power supply device avoiding audio frequency noise, it is characterised in that comprise:

One voltage input end；

One power switch circuit, this power switch circuit is electrically connected to this voltage input end；

One voltage output end, this voltage output end is electrically connected to this power switch circuit；

One pulse width modulation signal produces circuit, and this pulse width modulation signal produces circuit and is electrically connected to This power switch circuit；And

One pulse interval frequency detection circuit, this pulse interval frequency detection circuit is electrically connected to this power and opens Close circuit and this pulse width modulation signal produce circuit,

Wherein this pulse width modulation signal generation circuit controls this power by a pulse width modulation signal On-off circuit so that this is avoided the power supply device of audio frequency noise to enter a pulse interval pattern；Keep away at this Exempt from after the power supply device of audio frequency noise enters this pulse interval pattern, this pulse interval frequency detecting electricity A pulse interval frequency of this power switch circuit is detected on road；If this pulse interval of this power switch circuit Frequency falls into an audiorange, then this pulse interval frequency detection circuit notifies that this pulse width modulation signal is produced Raw this pulse interval frequency of circuit falls into this audiorange；This arteries and veins is notified at this pulse interval frequency detection circuit Rushing after this pulse interval frequency of width modulation signal generating circuit falls into this audiorange, this pulse width is adjusted Varying signal produces circuit and controls this power switch circuit by this pulse width modulation signal so that this is avoided sound Frequently the power supply device of noise leaves this pulse interval pattern to avoid audio frequency noise.

The power supply device avoiding audio frequency noise the most according to claim 7, it is characterised in that One input voltage is transferred into this power switch circuit through this voltage input end；This pulse width modulation signal Produce circuit and transmit this pulse width modulation signal to this power switch circuit so that this power switch circuit quilt This pulse width modulation signal controls to become an output voltage changing this input voltage；This power switch circuit This output voltage is exported through this voltage output end.

The power supply device avoiding audio frequency noise the most according to claim 7, it is characterised in that After this is avoided the power supply device of audio frequency noise to leave this pulse interval pattern, this pulse width modulation Signal generating circuit controls this power switch circuit by this pulse width modulation signal so that this is avoided audio frequency The power supply device of noise enters a normal mode of operation.

The power supply device avoiding audio frequency noise the most according to claim 7, it is characterised in that This audiorange is between 20 hertz to 20,000 hertz.