CN201577030U - PWM power amplifier for bipolar soft switch - Google Patents
PWM power amplifier for bipolar soft switch Download PDFInfo
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- CN201577030U CN201577030U CN2009202736137U CN200920273613U CN201577030U CN 201577030 U CN201577030 U CN 201577030U CN 2009202736137 U CN2009202736137 U CN 2009202736137U CN 200920273613 U CN200920273613 U CN 200920273613U CN 201577030 U CN201577030 U CN 201577030U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a PWM power amplifier for a bipolar soft switch, comprising a power power supply for providing the energy and a comparing unit, a pulse width modulation signal output unit, a full-bridge inverter switch set, a first transformer, a pulse polarity switching unit and a polarity change-over switch set. According to the utility model, the output voltage of the power amplifier can be switched between the positive voltage and the negative voltage, namely, the output has double polarity, the PWM power amplifier can be used in the audio frequency power amplification field, in addition, The circuit structure according to the utility model can apply the soft switch technology in the switch power supply, in work, the switch pipe can realize the zero voltage switch, the switch loss can be effectively reduced, thereby the switch frequency of the PWM power amplifier can be improved, thereby the signal to noise ratio of the amplifier can be provided, the volume of the desired output low pass filter in the known amplifier can be decreased.
Description
Technical field
The utility model relates to a kind of power amplifier, particularly a kind of bipolar soft-switching PWM power amplifier.
Background technology
According to present known PWM audio power amplifying apparatus, as the D power-like amplifier, power switch wherein works in the hard switching pattern mostly, be in the power switch process turn-offing or open, voltage that switch bore and electric current are all non-vanishing, therefore open or turn off process in be accompanied by bigger loss, i.e. switching loss.Switching frequency is high more, and then switching loss is just big more, and the hard switching process also can produce the high-frequency electromagnetic interference simultaneously.Therefore, the switching frequency of hard switching PWM audio power amplifying apparatus can not be too high.
In the middle of the Switching Power Supply design, be extensive use of the problem that soft switch technique solves the power switch pipe switching loss, yet, according to present known switching power unit, the polarity of its output is fixed, therefore, used soft switch technique can not directly apply to audio power amplifying apparatus in the Switching Power Supply.
The utility model content
For addressing the above problem, the bipolar soft-switching PWM power amplifier that the utility model provides a kind of suitable audio power to amplify, in conjunction with the soft switch technique in the Switching Power Supply, solve the power tube switching loss of prior art bigger and make that efficient reduces, the limited problem of switching frequency.
The utility model is that the technical scheme that its problem of solution is adopted is:
A kind of bipolar soft-switching PWM power amplifier, comprise the power power-supply that is used to provide energy and:
Comparing unit, comprise first input end, second input, first output and second output, described comparing unit is handled the back to the input signal of the first input end and second input and is exported first signal and secondary signal from first output and second output;
The pulse width modulating signal output unit is according to first signal output highpowerpulse signal of described comparing unit first output output;
The alteration switch group comprises switching tube, and described switching tube is realized opening and closing according to the highpowerpulse signal of pulse width modulation output unit output;
First transformer, former limit is connected with the alteration switch group, provides energy through conversion with after isolating to load;
The pulse polarity switch unit, receive the secondary signal of described comparing unit second output output and the highpowerpulse signal of pulse width modulating signal output unit output, according to secondary signal output and highpowerpulse signal homophase or anti-phase switch pulse signal;
The reversing switch group is connected between the secondary and load of transformer, and the switch pulse signal of exporting according to the pulse polarity switch unit carries out the switch switching.
Preferably, the utility model also comprises energy absorption units, is used for the energy of absorbing load when the reversing switch group is closed.
Preferably, the utility model also comprises energy feedback unit, and described energy feedback unit is connected between energy absorption units and the power power-supply, is used for the energy that energy absorption units absorbs is fed back to power power-supply.
Preferably, the front end of described comparing unit is provided with the error intergal amplifier, described error intergal amplifier is to handling from the given signal of control device and from the feedback signal of load, the first input end of described comparing unit receives the output signal of error intergal amplifier, second input end grounding.
The beneficial effects of the utility model are: comparing unit of the present utility model is controlled according to the switch pulse signal of two input signal paired pulses polarity switched cell output, the reversing switch group is carried out switch according to the switch pulse signal and is switched, make that the output voltage of power amplifier of the present utility model can conversion between positive voltage and negative voltage, promptly make its output have bipolarity, therefore can satisfy the application that audio power amplifies well; Circuit structure of the present utility model can be used the soft switch technique in the Switching Power Supply, switching tube can be realized zero voltage switching during its work, its switching loss can reduce effectively, thereby can improve the switching frequency of pwm power amplifier, thereby the signal to noise ratio of amplifier is provided, can also reduces the volume of output low pass filter required in the known amplifier.
In addition, when the utility model further comprises energy absorption units, when the reversing switch group is closed in the load energy remaining can be absorbed, when further comprising energy feedback unit, this partially absorbs energy and can feed back in the power power-supply, makes the efficient of whole amplifier be improved; The error intergal amplifier of comparing unit front end can be at first handling from the given signal of control device and from the feedback signal of load, the error intergal amplifier is output as the difference between two signals is carried out integration amplification signal afterwards, directly handle two input signals with comparing unit and compare, this method is more stable, more convenient.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is the circuit theory diagrams of the utility model preferred embodiment.
Embodiment
With reference to Fig. 1, a kind of bipolar soft-switching PWM power amplifier of the present utility model, comprise the power power-supply 9 that is used to provide energy and: comparing unit 1, comprise first input end 11, second input 12, first output 13 and second output 14, the input signal of the 1 pair of first input end 11 of described comparing unit and second input 12 is handled the back from first output 13 and second output, 14 output first signal and secondary signals; Pulse width modulating signal output unit 2 is according to first signal output highpowerpulse signal of described comparing unit first output 13 outputs; Alteration switch group 3 comprises switching tube, and described switching tube is realized opening and closing according to the highpowerpulse signal of pulse width modulation output unit output; First transformer 5, former limit is connected with alteration switch group 3, provides energy through conversion with after isolating to load; Pulse polarity switch unit 4, receive the secondary signal of described comparing unit second output 14 outputs and the highpowerpulse signal of pulse width modulating signal output unit 2 outputs, according to secondary signal output and highpowerpulse signal homophase or anti-phase switch pulse signal; Reversing switch group 6 is connected between the secondary and load of transformer, and the switch pulse signal of exporting according to pulse polarity switch unit 4 carries out the switch switching.
With reference to the circuit diagram of Fig. 2 the utility model preferred embodiment, audio output device K15 is connected with the output of power amplifier by the low pass filter of being made up of capacitor C 16, inductance L 17.Wherein full-bridge alteration switch group 3 comprises switching tube Q1, Q2, Q3, Q4, reversing switch group 6 comprises switching tube Q6, Q8, Q10, Q12, the two ends of switching tube Q6, Q8, Q10, Q12 also are connected to diode D7, D9, D11, D13, and the direction of diode D7, D9, D11, D13 is according to the circuit function setting.
Except above-mentioned structure, the utility model can also comprise energy absorption units 7, is used for the energy of absorbing load when reversing switch group 6 is closed.Further, the utility model can also comprise energy feedback unit 8, and energy feedback unit 8 is connected between energy absorption units 7 and the power power-supply 9, is used for the energy that energy absorption units 7 absorbs is fed back to power power-supply 9.Above-mentioned setting can make the whole efficiency of power amplifier be improved.As shown in Figure 2, energy absorption units 7 comprises a capacitor C28, energy feedback unit 8 comprises a switching tube Q35, the second transformer T35, diode D34, switching tube Q35, the second transformer T35 and diode 34 are formed an inverse-excitation type switch power-supply, capacitor C28 is as the direct-flow input end of time Switching Power Supply, energy remaining can be absorbed in the load when reversing switch group 6 is closed, and this part absorbed energy is fed back in the power power-supply 9 by the translation circuit that the switching tube Q35 and the second transformer T35 form.Wherein, preferably, first signal of first output 13 output is the absolute value of difference of the input signal of the first input end 11 and second input 12.
Usually, the given signal that comparing unit first input end 11 receives from control device, the feedback signal that second input 12 receives from load, power amplifier is controlled the rear end according to the size of this given signal and feedback signal.For the ease of handling, as preferred embodiment, the front end of comparing unit 1 is provided with the error intergal amplifier, the error intergal amplifier is to handling earlier from the given signal of control device and from the feedback signal of load, the first input end 11 of comparing unit 1 receives the output signal of error intergal amplifier, second input, 12 ground connection.What the first input end 11 of comparing unit 1 received at this moment amplifies signal afterwards for the difference of given signal and feedback signal being carried out integration, because second input end grounding of comparing unit 1, therefore its first output, 13 outputs is the absolute value of the signal that receives of first input end 11,14 outputs of second output be the positive-negative polarity signal of the signal that receives of first input end 11.This processing preferred embodiment is simpler, and process is more reliable and more stable.
The operation principle of circuit is as follows among Fig. 2:
When the absolute value of the difference of comparing unit first output 13 output greater than pulse width modulating signal output unit 2 in during preset threshold value, the highpowerpulse signal that 2 outputs of pulse width modulating signal output unit are directly proportional with the absolute value of difference, otherwise the highpowerpulse signal of the default minimum widith of output, according to this setting can control power amplifiers the output voltage size.
When the applied signal voltage of the first input end 11 of comparing unit 1 is higher than the applied signal voltage of second input 12, second output, 14 output low levels, the switch pulse signal of 4 outputs of pulse polarity switch unit and highpowerpulse signal homophase, switching tube Q6, Q8 in the reversing switch group, Q10, Q12 turn on and off according to this switch pulse signal, making the voltage that outputs to the load two ends is that the positive B of A is negative, i.e. this bipolar soft-switching PWM power amplifier output positive voltage; When the applied signal voltage of the first input end 11 of comparing unit is lower than the applied signal voltage of second input 12, second output, 14 output high level, the switch pulse signal of 4 outputs of pulse polarity switch unit and highpowerpulse signal inversion, switching tube Q6, Q8 in the reversing switch group, Q10, Q12 turn on and off according to this switch pulse signal, making the voltage that outputs to the load two ends is that A is just bearing B, i.e. this bipolar soft-switching PWM power amplifier output negative voltage.The voltage difference of the output end voltage of bipolar soft-switching PWM power amplifier and 1 liang of input of comparing unit keeps identical polar.
After the switching tube Q1 in the alteration switch group 3 closes, rely on the energy storage effect of inductance L 17, by transformer T5 coupling, it is zero that C point current potential is dropped to, and switching tube Q3 is can no-voltage open-minded; Simultaneously the secondary winding output voltage of transformer T5 is zero, makes switching tube Q6, Q8 in the reversing switch group 6, Q10, the Q12 can zero voltage switching; After the time-delay that needs, switching tube Q4 turn-offs, and relies on the elementary winding leakage inductance energy storage of transformer T5 D point current potential the is risen to voltage identical with the power power-supply size, makes switching tube Q2 can no-voltage open-minded, enters the next one work period and circulates with this.
In sum, the utility model can realize that the positive-negative polarity of power amplifier output end voltage polarity switches, and makes the utility model can be applicable to the application of audio power amplification aspect; In addition, the utility model has also been realized the soft switching process of switching tube in the power amplifier, has reduced the switching loss of switching tube.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can make some improvement, these improvement also should be considered as protection range of the present utility model.
Claims (5)
1. bipolar soft-switching PWM power amplifier, it is characterized in that comprising the power power-supply (9) that is used to provide energy and:
Comparing unit (1), comprise first input end (11), second input (12), first output (13) and second output (14), described comparing unit (1) is handled the back from first output (13) and second output (14) output first signal and secondary signal to the input signal of first input end (11) and second input (12);
Pulse width modulating signal output unit (2) is according to first signal output highpowerpulse signal of described comparing unit first output (13) output;
Alteration switch group (3) comprises switching tube, and described switching tube is realized opening and closing according to the highpowerpulse signal of pulse width modulation output unit output;
First transformer (5), former limit is connected with alteration switch group (3), provides energy through conversion with after isolating to load;
Pulse polarity switch unit (4), receive the secondary signal of described comparing unit second output (14) output and the highpowerpulse signal of pulse width modulating signal output unit (2) output, according to secondary signal output and highpowerpulse signal homophase or anti-phase switch pulse signal;
Reversing switch group (6) is connected between the secondary and load of transformer, and the switch pulse signal of exporting according to pulse polarity switch unit (4) carries out the switch switching.
2. a kind of bipolar soft-switching PWM power amplifier according to claim 1 is characterized in that also comprising energy absorption units (7), is used for the energy when reversing switch group (6) absorbing load when closing.
3. a kind of bipolar soft-switching PWM power amplifier according to claim 2 is characterized in that described energy absorption units (7) comprises a capacitor.
4. a kind of bipolar soft-switching PWM power amplifier according to claim 2, it is characterized in that also comprising energy feedback unit (8), described energy feedback unit (8) is connected between energy absorption units (7) and the power power-supply (9), is used for the energy that energy absorption units (7) absorbs is fed back to power power-supply (9).
5. a kind of bipolar soft-switching PWM power amplifier according to claim 1, the front end that it is characterized in that described comparing unit (1) is provided with the error intergal amplifier, described error intergal amplifier is to handling from the given signal of control device and from the feedback signal of load, the first input end of described comparing unit (11) receives the output signal of error intergal amplifier, second input (12) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202736137U CN201577030U (en) | 2009-11-20 | 2009-11-20 | PWM power amplifier for bipolar soft switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202736137U CN201577030U (en) | 2009-11-20 | 2009-11-20 | PWM power amplifier for bipolar soft switch |
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| Publication Number | Publication Date |
|---|---|
| CN201577030U true CN201577030U (en) | 2010-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202736137U Expired - Fee Related CN201577030U (en) | 2009-11-20 | 2009-11-20 | PWM power amplifier for bipolar soft switch |
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| CN (1) | CN201577030U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702221A (en) * | 2015-03-29 | 2015-06-10 | 安徽财经大学 | PWM (pulse width modulation) audio power amplifier |
| CN105409106A (en) * | 2013-07-23 | 2016-03-16 | 株式会社岛津制作所 | High voltage power supply device and mass spectrometry device using same |
| CN108762372A (en) * | 2018-05-30 | 2018-11-06 | 中国矿业大学(北京) | A kind of drive signal generating system and method |
-
2009
- 2009-11-20 CN CN2009202736137U patent/CN201577030U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105409106A (en) * | 2013-07-23 | 2016-03-16 | 株式会社岛津制作所 | High voltage power supply device and mass spectrometry device using same |
| CN105409106B (en) * | 2013-07-23 | 2018-04-10 | 株式会社岛津制作所 | High-voltage power supply device and the quality analysis apparatus using the device |
| CN104702221A (en) * | 2015-03-29 | 2015-06-10 | 安徽财经大学 | PWM (pulse width modulation) audio power amplifier |
| CN104702221B (en) * | 2015-03-29 | 2017-09-01 | 安徽财经大学 | PWM power amplifier |
| CN108762372A (en) * | 2018-05-30 | 2018-11-06 | 中国矿业大学(北京) | A kind of drive signal generating system and method |
| CN108762372B (en) * | 2018-05-30 | 2020-09-29 | 中国矿业大学(北京) | Driving signal generation system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ENPING CE-ANCE ELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ENPING XITEER DIGITAL TECHNOLOGY CO., LTD. Effective date: 20120320 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120320 Address after: 529400 No. 28, D District, Enping foreign capital private capital industrial zone, Guangdong, China Patentee after: Enping City Xiteer Digital Technology Co., Ltd. Address before: 529400 No. 28, D District, Enping foreign capital private capital industrial zone, Guangdong, China Patentee before: Enping Xiteer Digital Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100908 Termination date: 20181120 |