CN202385058U - Circuit structure for realizing dead time self-adaptive control in D-type power amplifier - Google Patents
Circuit structure for realizing dead time self-adaptive control in D-type power amplifier Download PDFInfo
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- CN202385058U CN202385058U CN2011205553864U CN201120555386U CN202385058U CN 202385058 U CN202385058 U CN 202385058U CN 2011205553864 U CN2011205553864 U CN 2011205553864U CN 201120555386 U CN201120555386 U CN 201120555386U CN 202385058 U CN202385058 U CN 202385058U
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Abstract
The utility model relates to a circuit structure for realizing the dead time self-adaptive control in a D-type power amplifier, which comprises a pulse width modulator, a bridge type driver-stage circuit and a dead time control circuit module, wherein the dead time control circuit module is connected between the pulse width modulator and the bridge type driver-stage circuit in series. The dead time control circuit module comprises a variable dead time modulation circuit, a through current detection circuit and a decider circuit; the output end of the bridge type driver-stage circuit is connected with the through current detection circuit, the decider circuit and the variable dead time modulation circuit in sequence; and the variable dead time modulation circuit is connected between the pulse width modulator and the bridge type driver-stage circuit in series. By adopting the circuit structure for realizing the dead time self-adaptive control in the D-type power amplifier, the dead time can be optimized according to an output signal of the bridge type driver-stage circuit and through adapting to the continuous change of working states of the circuits, and further, the output signal distortion caused by the dead time is reduced, so that the circuit failure is avoided, and the reliability and the safety of the circuits are improved.
Description
Technical field
The utility model relates to field circuit structure technical field, and particularly D class power amplifier technical field of structures specifically is meant the circuit structure of realizing the Dead Time adaptive control in a kind of D power-like amplifier.
Background technology
The topological structure of all bridge circuits of D class A amplifier A all requires certain Dead Time to produce an on-delay; On-delay is specially to add on the bridge circuit; To prevent that driving tube conducting simultaneously causes puncturing up and down; The phenomenon of driving tube conducting simultaneously is called as straight-throughly up and down, can make device failure when electric current is very big.
In the prior art; Be 200820094360.2 Chinese patent like the patent No.: a kind of Dead Time modulation circuit and audio-frequency power amplifier, its circuit structure is as shown in Figure 1, provides a kind of Dead Time modulation circuit to adopt the digital delay module; Be equipped with logical circuit optimally and realize the setting of Dead Time; Control dead area time accurately reduces distortion, has solved employing RC circuit and Dead Time is set has caused the coarse problem of Dead Time.As shown in Figure 2, utilize the RC of this patent that the Dead Time t1 that structure produced and the t2 and the inaccuracy of Dead Time are set.
Also take circuit structure shown in Figure 3 in the prior art, its effect is as shown in Figure 4.Wherein, t11=t12 has realized coupling comparatively accurately than the aforesaid structure that Dead Time is set with RC.
But coarse Dead Time no doubt is not optimized, and accurate Dead Time still is not optimized.Reason is, desirable Dead Time is compromise between distortion performance and conducting size of current, in the hope of can be under acceptable conducting electric current distortion more little good more.Desirable dead band time setting is a fixing exact value certainly not, and should be a value that changes with different condition.In the above-mentioned prior art, do not attempt to minimize the distortion that Dead Time causes, just reduced to cause that part of distortion owing to the inaccuracy of Dead Time.Therefore, still there is further improved space in prior art.
The utility model content
The purpose of the utility model is to have overcome above-mentioned shortcoming of the prior art; Provide a kind of Dead Time that reduces up to the threshold value that reaches through current; As optimized Dead Time, and dynamically adjust Dead Time with the characteristics that the difference of supply voltage changes with this according to the through current threshold value, thus the continuous variation of adaptive circuit operating state; Can arrive optimum value by the rapid adjustment Dead Time; And simple in structure, with low cost, the circuit structure of realization Dead Time adaptive control in the D power-like amplifier that has wide range of applications.
In order to realize above-mentioned purpose, realize in the D power-like amplifier of the utility model that the circuit structure of Dead Time adaptive control has following formation:
This circuit structure comprises pulse width modulator and bridge-type driving stage circuit; The input of described pulse width modulator connects audio signal and carrier signal; The pulse-width signal output of described pulse width modulator connects described bridge-type driving stage circuit, and the output of described bridge-type driving stage circuit connects loudspeaker.This described circuit structure also comprises the dead-time control circuit module; Described dead-time control circuit module is serially connected with between described pulse width modulator and the bridge-type driving stage circuit, and according to the Dead Time of this bridge-type driving stage circuit of output signal controlling of described bridge-type driving stage circuit.
Realize in the circuit structure of Dead Time adaptive control in this D power-like amplifier; Described dead-time control circuit module comprises variable Dead Time modulation circuit, through current testing circuit and decision device circuit; The input of described through current testing circuit connects described bridge-type driving stage circuit; Its output connects the input of described decision device circuit; The output of described decision device circuit connects described variable Dead Time modulation circuit, and described variable Dead Time modulation circuit is serially connected with between described pulse width modulator and the bridge-type driving stage circuit, and controls the Dead Time of described bridge-type driving stage circuit.
Realize in the circuit structure of Dead Time adaptive control in this D power-like amplifier; Described through current testing circuit comprises that image current detects electronic circuit and current/voltage conversion electronic circuit; The input of described image current detection electronic circuit connects the output of described bridge-type driving stage circuit; The output that described image current detects electronic circuit connects the current input terminal that described current/voltage is changed electronic circuit, and the voltage output end of described current/voltage conversion electronic circuit connects the input of described decision device circuit.
Realize in the circuit structure of Dead Time adaptive control in this D power-like amplifier; Described decision device circuit is a voltage comparator; The input of described voltage comparator connects the output and the supply voltage of described through current testing circuit respectively, and the output of described voltage comparator connects described variable Dead Time modulation circuit.
Realize in the circuit structure of Dead Time adaptive control in this D power-like amplifier; Described variable Dead Time modulation circuit comprises that the first adjustable numeral is delayed electronic circuit and the second adjustable numeral is delayed electronic circuit; The described first adjustable numeral is delayed electronic circuit and all is connected the output of described pulse width modulator and the output of described decision device circuit with the input that the second adjustable numeral is delayed electronic circuit; The output that the described first adjustable numeral is delayed electronic circuit is the controlled positive pulse width signal of a Dead Time output; The output that the described second adjustable numeral is delayed electronic circuit be the controlled anti-phase of Dead Time to the pulse width signal output, the controlled positive pulse width signal of described Dead Time output all is connected described bridge-type driving stage circuit with the controlled anti-phase pulse width signal of described Dead Time output.
Adopted the circuit structure of realizing the Dead Time adaptive control in the D power-like amplifier of this utility model; Because this circuit structure comprises the dead-time control circuit module that is serially connected with between pulse width modulator and the bridge-type driving stage circuit; Thereby can utilize the Dead Time of this dead band time control circuit module according to this bridge-type driving stage circuit of output signal controlling of bridge-type driving stage circuit; Make the circuit structure of the utility model can adaptive circuit the continuous variation of operating state; And dynamically adjust Dead Time with the characteristics that the difference of supply voltage changes according to the through current threshold value; Is optimized Dead Time to reduce Dead Time up to the threshold value that reaches through current, comes the rapid adjustment Dead Time to optimum value.And then reduce because the D class audio power amplifying circuit output distorted signals that Dead Time causes can also be avoided improving the reliability and security of circuit owing to the short partially circuit malfunction that causes of dead band time setting length simultaneously.And realize the circuit structure of Dead Time adaptive control in the D power-like amplifier of the utility model, it is simple in structure, and is with low cost, has wide range of applications.
Description of drawings
Fig. 1 is the electrical block diagram of the Dead Time modulation circuit of first kind of prior art.
Fig. 2 is the Dead Time control effect sketch map of the Dead Time modulation circuit of first kind of prior art.
Fig. 3 is the electrical block diagram of the Dead Time modulation circuit of second kind of prior art.
Fig. 4 is the Dead Time control effect sketch map of the Dead Time modulation circuit of second kind of prior art.
Fig. 5 is a sketch map of realizing the circuit structure of Dead Time adaptive control in the D power-like amplifier of the utility model.
Fig. 6 is a structural representation of realizing the dead-time control circuit module in the circuit structure of Dead Time adaptive control in the D power-like amplifier of the utility model.
Fig. 7 is a Dead Time control effect sketch map of realizing the circuit structure of Dead Time adaptive control in the D power-like amplifier of the utility model.
Embodiment
In order more to be expressly understood the technology contents of the utility model, the special following examples of lifting specify.
See also shown in Figure 5ly, be to realize in the D power-like amplifier of the utility model the sketch map of the circuit structure of Dead Time adaptive control.
In one embodiment; The circuit structure of realizing the Dead Time adaptive control in this D power-like amplifier comprise pulse width modulator, bridge-type driving stage circuit and be serially connected with described pulse width modulator and bridge-type driving stage circuit between the dead-time control circuit module; The input of described pulse width modulator connects audio signal and carrier signal; The pulse-width signal output of described pulse width modulator connects described bridge-type driving stage circuit, and described dead-time control circuit module is according to the Dead Time of this bridge-type driving stage circuit of output signal controlling of described bridge-type driving stage circuit.Wherein, Described dead-time control circuit module comprises variable Dead Time modulation circuit, through current testing circuit and decision device circuit; The input of described through current testing circuit connects described bridge-type driving stage circuit; Its output connects the input of described decision device circuit; The output of described decision device circuit connects described variable Dead Time modulation circuit, and described variable Dead Time modulation circuit is serially connected with between described pulse width modulator and the bridge-type driving stage circuit, and controls the Dead Time of described bridge-type driving stage circuit.
A kind of preferred embodiment in; As shown in Figure 6; Described through current testing circuit comprises that image current detects electronic circuit and current/voltage conversion electronic circuit; The input of described image current detection electronic circuit connects the output of described bridge-type driving stage circuit; The output that described image current detects electronic circuit connects the current input terminal that described current/voltage is changed electronic circuit, and the voltage output end of described current/voltage conversion electronic circuit connects the input of described decision device circuit.This decision device circuit is a voltage comparator; The input of described voltage comparator connects the voltage output end and the supply voltage of described current/voltage conversion electronic circuit respectively, and the output of described voltage comparator connects described variable Dead Time modulation circuit.This variable Dead Time modulation circuit comprises that the first adjustable numeral is delayed electronic circuit and the second adjustable numeral is delayed electronic circuit; The described first adjustable numeral is delayed electronic circuit and all is connected the output of described pulse width modulator and the output of described voltage comparator with the input that the second adjustable numeral is delayed electronic circuit; The output that the described first adjustable numeral is delayed electronic circuit is the controlled positive pulse width signal of a Dead Time output; The output that the described second adjustable numeral is delayed electronic circuit be the controlled anti-phase of Dead Time to the pulse width signal output, the controlled positive pulse width signal of described Dead Time output all is connected described bridge-type driving stage circuit with the controlled anti-phase pulse width signal of described Dead Time output.
In practical application; The amplifying stage of the D class audio frequency power amplifier of the utility model, as shown in Figure 5, comprise that audio input signal and carrier wave are through the pulse-width modulation generator; Obtain pulse width modulated wave, enter into variable Dead Time modulation circuit then and arrive the work of bridge-type driving stage driving loudspeaker again.Feedback stage comprises that the conducting current detection circuit is used to detect the through current of driving stage, and decision device then compares its value and preset reference value, continues to reduce Dead Time if above-mentioned electric current, is then controlled variable Dead Time modulation circuit less than reference value; If greater than reference value, then control variable Dead Time modulation circuit and increase Dead Time.We have obtained an optimized Dead Time through such mode, promptly can also compare the shorter Dead Time of prior art by steady operation for one.
In actual implementation method, as shown in Figure 6, the structure that can adopt the mirror type current detection circuit to detect as through current, it is similar to common current foldback circuit structure, extracts the detected object of the mirror image proportional current of driving tube as testing circuit; Current-to-voltage convertor converts the current value that testing circuit obtains into magnitude of voltage; Decision device is a comparator, supply voltage is worth with conversion magnitude of voltage later as a reference compare, and the result who draws outputs to adjustable digital delaying circuit; Adjustable digital delaying circuit is according to the result of comparator, and successively decreasing one by one or increasing progressively Dead Time perhaps remains unchanged, and modules A is slightly different with the logic of module B, is used for producing pwm signal and its inversion signal.The effect of the circuit structure of the utility model, as shown in Figure 7, adaptive mode be successively decrease one by one Dead Time (t1=t2＞t3=t4＞t5=t6), if this moment, condition of work did not change, Dead Time promptly is locked in t6 so; Also can use the such mode of similar successive approximation type a/d C, during variable progression also is not limited to illustrate three grades.The structure of conducting current detection circuit can be selected other form for use, and decision device also can design according to characteristics, the various conditions of different circuit, but purpose is to make this circuit reach automatic adaptation conducting change in current and choose the optimum value in the adjustable value.
Adopted the circuit structure of realizing the Dead Time adaptive control in the D power-like amplifier of this utility model; Because this circuit structure comprises the dead-time control circuit module that is serially connected with between pulse width modulator and the bridge-type driving stage circuit; Thereby can utilize the Dead Time of this dead-time control circuit module according to this bridge-type driving stage circuit of output signal controlling of bridge-type driving stage circuit; Make the circuit structure of the utility model can adaptive circuit the continuous variation of operating state; And dynamically adjust Dead Time with the characteristics that the difference of supply voltage changes according to the through current threshold value; Is optimized Dead Time to reduce Dead Time up to the threshold value that reaches through current, comes the rapid adjustment Dead Time to optimum value.And then reduce because the D class audio power amplifying circuit output distorted signals that Dead Time causes can also be avoided improving the reliability and security of circuit owing to the short partially circuit malfunction that causes of dead band time setting length simultaneously.And realize the circuit structure of Dead Time adaptive control in the D power-like amplifier of the utility model, it is simple in structure, and is with low cost, has wide range of applications.
In this specification, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and the scope of the utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (4)
1. realize the circuit structure of Dead Time adaptive control in the D power-like amplifier; Described circuit structure comprises pulse width modulator and bridge-type driving stage circuit; The input of described pulse width modulator connects audio signal and carrier signal; The pulse-width signal output of described pulse width modulator connects described bridge-type driving stage circuit; The output of described bridge-type driving stage circuit connects loudspeaker, it is characterized in that described circuit structure also comprises the dead-time control circuit module; Described dead-time control circuit module comprises variable Dead Time modulation circuit, through current testing circuit and decision device circuit; The input of described through current testing circuit connects described bridge-type driving stage circuit, and its output connects the input of described decision device circuit, and the output of described decision device circuit connects described variable Dead Time modulation circuit; Described variable Dead Time modulation circuit is serially connected with between described pulse width modulator and the bridge-type driving stage circuit, and controls the Dead Time of described bridge-type driving stage circuit.
2. realize the circuit structure of Dead Time adaptive control in the D power-like amplifier according to claim 1; It is characterized in that; Described through current testing circuit comprises that image current detects electronic circuit and current/voltage conversion electronic circuit; The input of described image current detection electronic circuit connects the output of described bridge-type driving stage circuit; The output that described image current detects electronic circuit connects the current input terminal that described current/voltage is changed electronic circuit, and the voltage output end of described current/voltage conversion electronic circuit connects the input of described decision device circuit.
3. realize the circuit structure of Dead Time adaptive control in the D power-like amplifier according to claim 1; It is characterized in that; Described decision device circuit is a voltage comparator; The input of described voltage comparator connects the output and the supply voltage of described through current testing circuit respectively, and the output of described voltage comparator connects described variable Dead Time modulation circuit.
4. according to the circuit structure of realizing the Dead Time adaptive control in each described D power-like amplifier in the claim 1 to 3; It is characterized in that; Described variable Dead Time modulation circuit comprises that the first adjustable numeral is delayed electronic circuit and the second adjustable numeral is delayed electronic circuit; The described first adjustable numeral is delayed electronic circuit and all is connected the output of described pulse width modulator and the output of described decision device circuit with the input that the second adjustable numeral is delayed electronic circuit; The output that the described first adjustable numeral is delayed electronic circuit is the controlled positive pulse width signal of a Dead Time output; The output that the described second adjustable numeral is delayed electronic circuit be the controlled anti-phase of Dead Time to the pulse width signal output, the controlled positive pulse width signal of described Dead Time output all is connected described bridge-type driving stage circuit with the controlled anti-phase pulse width signal of described Dead Time output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011205553864U CN202385058U (en) | 2011-12-27 | 2011-12-27 | Circuit structure for realizing dead time self-adaptive control in D-type power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011205553864U CN202385058U (en) | 2011-12-27 | 2011-12-27 | Circuit structure for realizing dead time self-adaptive control in D-type power amplifier |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207452A (en) * | 2015-09-14 | 2015-12-30 | 江苏物联网研究发展中心 | IGBT drive circuit |
| CN107306117A (en) * | 2016-04-22 | 2017-10-31 | 晶豪科技股份有限公司 | Quaternary/ternary modulation selection circuit |
| US10218312B2 (en) | 2016-02-29 | 2019-02-26 | Qualcomm Incorporated | Dynamic volume management in audio amplifiers |
| US10256777B2 (en) | 2016-02-29 | 2019-04-09 | Qualcomm Incorporated | Audio amplifiers |
| CN111384849A (en) * | 2018-12-29 | 2020-07-07 | 无锡华润矽科微电子有限公司 | Circuit structure and method for realizing dead time self-adaption function of class-D power amplifier |
| CN112039450A (en) * | 2019-06-04 | 2020-12-04 | 晶豪科技股份有限公司 | Pulse width modulation driving stage and full-bridge type D power amplifier |
-
2011
- 2011-12-27 CN CN2011205553864U patent/CN202385058U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207452A (en) * | 2015-09-14 | 2015-12-30 | 江苏物联网研究发展中心 | IGBT drive circuit |
| US10218312B2 (en) | 2016-02-29 | 2019-02-26 | Qualcomm Incorporated | Dynamic volume management in audio amplifiers |
| US10256777B2 (en) | 2016-02-29 | 2019-04-09 | Qualcomm Incorporated | Audio amplifiers |
| CN107306117A (en) * | 2016-04-22 | 2017-10-31 | 晶豪科技股份有限公司 | Quaternary/ternary modulation selection circuit |
| CN111384849A (en) * | 2018-12-29 | 2020-07-07 | 无锡华润矽科微电子有限公司 | Circuit structure and method for realizing dead time self-adaption function of class-D power amplifier |
| CN112039450A (en) * | 2019-06-04 | 2020-12-04 | 晶豪科技股份有限公司 | Pulse width modulation driving stage and full-bridge type D power amplifier |
| CN112039450B (en) * | 2019-06-04 | 2024-03-26 | 晶豪科技股份有限公司 | Pulse width modulation output stage device and full-bridge type D-type power amplifier |
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| GR01 | Patent grant | ||
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Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Patentee after: China Resources micro integrated circuit (Wuxi) Co., Ltd Address before: No.180-22, Linghu Avenue, Wuxi, Jiangsu 214000 Patentee before: WUXI CHINA RESOURCES SEMICO Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
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Granted publication date: 20120815 |
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| CX01 | Expiry of patent term |