CN203104369U - Carrier-wave underclocking type class-D audio power amplifier - Google Patents
Carrier-wave underclocking type class-D audio power amplifier Download PDFInfo
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- CN203104369U CN203104369U CN 201320103977 CN201320103977U CN203104369U CN 203104369 U CN203104369 U CN 203104369U CN 201320103977 CN201320103977 CN 201320103977 CN 201320103977 U CN201320103977 U CN 201320103977U CN 203104369 U CN203104369 U CN 203104369U
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Abstract
The utility model provides a carrier-wave underclocking type class-D audio power amplifier. The carrier-wave underclocking type class-D audio power amplifier comprises a pulse-width modulation (PWM) modulator circuit, a driving circuit, an upper half-bridge circuit and a lower half-bridge circuit, wherein the PWM modulator circuit is connected with the driving circuit, the upper half-bridge circuit is connected with the lower half-bridge circuit in a cascaded mode, and the PWM modulator circuit processes input carrier signals and an audio signal to generate a PWM modulation signal. The driving circuit is connected with the upper half-bridge circuit and the lower half-bridge circuit. The output end of the lower half-bridge circuit is connected to the power supply end of the upper half-bridge circuit. The output end of the upper half-bridge circuit is connected with a filter or a load. The carrier signals are two triangular carriers which are identical in frequency and opposite in phase. The two triangular carriers modulate the same audio signal restively. The generated two PWM modulation signals control the upper half-bridge circuit and the lower half-bridge circuit respectively. According to the carrier-wave underclocking type class-D audio power amplifier, the amplitude of harmonic waves is reduced, filtration removal of the harmonic waves is benefited, the size of a filter element is reduced, the electromagnetic radiation problem of the class-D audio power amplifier is alleviated, switching loss is reduced, and high-power output of the class-D audio power amplifier is benefited.
Description
Technical field
The utility model relates to D class audio frequency power amplifying device, is specifically related to a kind of carrier wave frequency-reducing type D genus audio power amplifier.
Background technology
At present in audio-frequency power amplifier, AB class audio frequency power amplifier commonly used, its efficient is generally below 50%, category-A audio frequency power amplifier efficient is then lower, in the high-power audio power amplifier, then available G class audio frequency power amplifier has improved efficient with the classification power source method, but efficient generally still is lower than the efficient of D class audio frequency power amplifier, and general D class audio frequency power amplification efficiency can easily be accomplished more than 80%.But the switching frequency of D class audio frequency power amplifier reaches more than 100KHz ~ 200KHz usually, exists very important switching loss, and problem such as electromagnetic radiation.Especially for powerful D class power amplifier, switching loss also is considerable, more serious problem is that powerful amplifier power supply voltage is higher, voltage and current switch stress during circuit working is all very big, switching frequency is very high again, its carrier wave and harmonic wave thereof near or enter in the wavelength band of long wave and medium wave, electromagnetic radiation is very strong, the EMI problem is serious.
Tradition D class audio frequency power amplifier is normal half-bridge or the H full-bridge circuit of adopting of level not, half-bridge circuit wherein, and when selecting triangular carrier, carrier frequency will be higher than 100KHz, and promptly the carrier wave ratio of the audio frequency of 20KHz is greater than 5 relatively.And the output of the D class power amplifier of H full-bridge circuit needs two LC filters.
The utility model content
The utility model provides a kind of carrier wave frequency-reducing type D genus audio power amplifier at above-mentioned the deficiencies in the prior art.This carrier wave frequency-reducing type D genus audio power amplifier can reduce harmonic amplitude, reduces the volume of filter element, alleviates the electromagnetic radiation of D class audio frequency power amplifier, reduces switching loss, is more conducive to the high-power output of D class audio frequency power amplifier.
The utility model is achieved by the following technical solution:
A kind of carrier wave frequency-reducing type D genus audio power amplifier comprises continuous PWM modulation circuit and drive circuit, and the PWM modulation circuit is handled generation PWM modulation signal to the carrier signal and the audio signal of input;
It is characterized in that described carrier wave frequency-reducing type D genus audio power amplifier also comprises the last half-bridge circuit and the following half-bridge circuit of cascade, drive circuit and last half-bridge circuit and following half-bridge circuit homogeneous phase connect; The output of following half-bridge circuit is connected to the power end of half-bridge circuit, the output termination filter or the load of last half-bridge circuit; Described carrier signal is two triangular carriers that frequency is identical, phase place is opposite; Two triangular carrier signals are used to modulate same audio signal, and the PWM modulation circuit generates two PWM modulation signals, and two PWM modulation signals are respectively applied for control and go up half-bridge circuit and following half-bridge circuit.
Further, last half-bridge circuit is powered by positive supply, and following half-bridge circuit is powered by negative supply; Output point under between two switching tubes of following half-bridge circuit being, following output point is connected to the power supply negative terminal of half-bridge circuit, is last output point between two switching tubes of last half-bridge circuit, and last output point is connected to filter or load; The power positive end of following half-bridge circuit is a common ground.
Further, last half-bridge circuit is powered by negative supply, and following half-bridge circuit is powered by positive supply; Output point under between two switching tubes of following half-bridge circuit being, following output point is connected to the power positive end of half-bridge circuit, is last output point between two switching tubes of last half-bridge circuit, and last output point is connected to filter or load; The power supply negative terminal of following half-bridge circuit is a common ground.
Carrier wave frequency-reducing type D genus audio power amplifier described in the utility model has utilized the D class power amplifier structure of half-bridge cascade, when the cascade number equals 2, just can utilize the carrier phase technology, promptly utilize two frequencies identical, but the triangular carrier that phase place is opposite is modulated two half-bridges respectively, in theory, the carrier frequency of output will double, and increase purpose frequently thereby reach.In other words, under output same equivalent carrier case, the triangular carrier frequency approximately can reduce twice.Under equal power output condition, compare the single stage semi-bridge power amplifier, the device withstand voltage and the voltage stress of novel half-bridge cascade D class power amplifier will reduce half, be the outputs of three level, reduced harmonic amplitude, be convenient to the filtering of harmonic wave, reduced the volume of filter element, alleviate the electromagnetic radiation of D class audio frequency power amplifier, also reduced switching loss, be more conducive to the high-power output of D class audio frequency power amplifier.
Description of drawings
Fig. 1 is a carrier wave frequency-reducing type D class power amplifier one;
Fig. 2 is a carrier wave frequency-reducing type D class power amplifier two;
Fig. 3 is carrier phase modulation scheme figure.
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
Carrier wave frequency-reducing type D genus audio power amplifier described in the utility model is a kind of half-bridge cascade connection type D class power amplifier, is the power end that the output of conventional half-bridge is connected to another half-bridge, and the output of another half-bridge connects filter, again to load, or directly load.The DC power supply voltage of two half-bridges can equate that the output level number is 3.Concretely, this carrier wave frequency-reducing type D genus audio power amplifier, comprise PWM modulation circuit and drive circuit, and the last half-bridge circuit of cascade and following half-bridge circuit, the PWM modulation circuit is to the carrier signal of input and audio signal compares or other compute mode generation PWM modulation signal; Drive circuit and last half-bridge circuit and following half-bridge circuit homogeneous phase connect.The output of following half-bridge circuit is connected to the power end of half-bridge circuit, the output termination filter or the load of last half-bridge circuit; Described carrier signal is two triangular carriers that frequency is identical, phase place is opposite, and two triangular carrier signals are modulated same audio signal respectively, and two PWM modulation signals of generation are controlled half-bridge circuit and following half-bridge circuit respectively.
Figure 1 shows that an embodiment of carrier wave frequency-reducing type D genus audio power amplifier, wherein the power supply of two half-bridges of cascade is independently up and down, is two power supply architectures.Last half-bridge circuit is powered by positive supply, and following half-bridge circuit is powered by negative supply; Output point under between two switching tubes of following half-bridge circuit being, following output point is connected to the power supply negative terminal of half-bridge circuit, be last output point between two switching tubes of last half-bridge circuit, last output point is connected to filter (only needing a LC or LRC filter to get final product) or directly connects load; The power positive end of following half-bridge circuit is a common ground.
The carrier wave of two half-bridges is two triangular waves that frequency is identical, phase place is opposite
u C1,
u C2, i.e. their phase shift are respectively with same audio frequency
u sRelatively, generate two-way PWM modulating wave, remove to control half-bridge switch device separately through drive circuit again.V
1And V
2The following half-bridge output of forming is connected to by V
3And V
4The power supply negative terminal of half-bridge on the composition, output
u oBe two half-bridge PWM stacks.
Two half-bridges up and down of the utility model cascade adopt carrier phase (Carrier Phase-Shifted, CPS) SPWM modulator approach, its modulator approach as shown in Figure 3, it is the bipolarity modulator approach of two carrier waves, carrier wave is two triangular waves that differ 180 °, modulating wave is an identical sine wave, and conversion is output as the stack of two SPWM ripples.The characteristics of this method are: the power device operating frequency is lower, can realize increasing frequently of inversion outgoing carrier, and the power of two semi-bridge inversions equates up and down.
(Carrier Phase-Shifted, CPS) during the SPWM modulator approach, the power of each half-bridge D class power amplifier equates that gross power is shared by two power supplys, is more conducive to powerful output like this when two half-bridges up and down of cascade adopt carrier phase.According to feature recited above, with the output of many level, harmonic wave is frequently higher, and amplitude is also littler, and device withstand voltage then reduces half, is convenient to low withstand voltage power MOS pipe, and the on state resistance that hangs down withstand voltage power MOS pipe is littler, thereby efficient is higher.
Figure 2 shows that another embodiment of carrier wave frequency-reducing type D genus audio power amplifier, wherein go up half-bridge circuit and power that following half-bridge circuit is powered by positive supply by negative supply; Output point under between two switching tubes of following half-bridge circuit being, following output point is connected to the power positive end of half-bridge circuit, is last output point between two switching tubes of last half-bridge circuit, and last output point is connected to filter or load; The power supply negative terminal of following half-bridge circuit is a common ground.
The utility model not only is confined to above-mentioned embodiment; persons skilled in the art are according to the disclosed content of the utility model; can adopt other multiple embodiment to implement the utility model; therefore; every employing project organization of the present utility model and thinking; do some simple designs that change or change, all fall into the scope of the utility model protection.
Claims (3)
1. a carrier wave frequency-reducing type D genus audio power amplifier comprises continuous PWM modulation circuit and drive circuit, and the PWM modulation circuit is handled generation PWM modulation signal to the carrier signal and the audio signal of input;
It is characterized in that described carrier wave frequency-reducing type D genus audio power amplifier also comprises the last half-bridge circuit and the following half-bridge circuit of cascade, drive circuit and last half-bridge circuit and following half-bridge circuit homogeneous phase connect; The output of following half-bridge circuit is connected to the power end of half-bridge circuit, the output termination filter or the load of last half-bridge circuit; Described carrier signal is two triangular carriers that frequency is identical, phase place is opposite; Two triangular carrier signals are used to modulate same audio signal, and the PWM modulation circuit generates two PWM modulation signals, and two PWM modulation signals are respectively applied for control and go up half-bridge circuit and following half-bridge circuit.
2. carrier wave frequency-reducing type D genus audio power amplifier according to claim 1 is characterized in that last half-bridge circuit is powered by positive supply, and following half-bridge circuit is powered by negative supply; Output point under between two switching tubes of following half-bridge circuit being, following output point is connected to the power supply negative terminal of half-bridge circuit, is last output point between two switching tubes of last half-bridge circuit, and last output point is connected to filter or load; The power positive end of following half-bridge circuit is a common ground.
3. carrier wave frequency-reducing type D genus audio power amplifier according to claim 1 is characterized in that last half-bridge circuit is powered by negative supply, and following half-bridge circuit is powered by positive supply; Output point under between two switching tubes of following half-bridge circuit being, following output point is connected to the power positive end of half-bridge circuit, is last output point between two switching tubes of last half-bridge circuit, and last output point is connected to filter or load; The power supply negative terminal of following half-bridge circuit is a common ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320103977 CN203104369U (en) | 2013-03-07 | 2013-03-07 | Carrier-wave underclocking type class-D audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320103977 CN203104369U (en) | 2013-03-07 | 2013-03-07 | Carrier-wave underclocking type class-D audio power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN203104369U true CN203104369U (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320103977 Expired - Fee Related CN203104369U (en) | 2013-03-07 | 2013-03-07 | Carrier-wave underclocking type class-D audio power amplifier |
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| Country | Link |
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| CN (1) | CN203104369U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160677A (en) * | 2016-06-16 | 2016-11-23 | 长沙湘计海盾科技有限公司 | A kind of carried shift PWM modulation type digital power amplifier and power-magnifying method |
-
2013
- 2013-03-07 CN CN 201320103977 patent/CN203104369U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160677A (en) * | 2016-06-16 | 2016-11-23 | 长沙湘计海盾科技有限公司 | A kind of carried shift PWM modulation type digital power amplifier and power-magnifying method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20190307 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |