TW202243366A - Wireless audio output device - Google Patents

Wireless audio output device Download PDF

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TW202243366A
TW202243366A TW110115334A TW110115334A TW202243366A TW 202243366 A TW202243366 A TW 202243366A TW 110115334 A TW110115334 A TW 110115334A TW 110115334 A TW110115334 A TW 110115334A TW 202243366 A TW202243366 A TW 202243366A
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transistor
contact
terminal
charging
coupled
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TW110115334A
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Chinese (zh)
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TWI770970B (en
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陳弘易
林浩廷
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達發科技股份有限公司
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Priority to TW110115334A priority Critical patent/TWI770970B/en
Priority to CN202110522686.0A priority patent/CN115250405A/en
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Publication of TW202243366A publication Critical patent/TW202243366A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1025—Accumulators or arrangements for charging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention discloses a wireless audio output device, which including a first contact, a second contact, a third contact and a charge protection circuit. A first node of the charge protection circuit is coupled to the first contact and a charge control circuit. A second node of the charge protection circuit is coupled to the second contact and a signal reception circuit. The charge protection circuit has a first state and a second state. In the first state, the charge protection circuit is turned on to couple the first contact and the second contact. In the second state, the charge protection circuit is turned off to not couple the first contact and the second contact.

Description

無線音訊輸出裝置Wireless Audio Output Device

本發明是有關於一種音訊輸出裝置，特別是關於一種無線音訊輸出裝置。The invention relates to an audio output device, in particular to a wireless audio output device.

無線耳機因其便利性而受到現代人的喜愛。一般而言，無線耳機是通過搭配的充電盒來進行充電。除了具備充電的功能之外，為了滿足使用者的需求，充電盒通常也具有能夠與無線耳機進行通訊的功能。因應於充電盒的功能配置，無線耳機的電路設計將成為一個重要的課題。Wireless headphones are loved by modern people for their convenience. Generally speaking, wireless earphones are charged through the matching charging box. In addition to the charging function, in order to meet the needs of users, the charging box usually also has the function of being able to communicate with the wireless earphone. According to the functional configuration of the charging box, the circuit design of the wireless earphone will become an important issue.

本發明實施例係揭露一種無線音訊輸出裝置，包括一第一接點、一第二接點、一第三接點、一充電控制電路、一訊號接收電路及一充電保護電路。第一接點耦接至一穩壓電容。第三接點接地。充電保護電路的一第一端耦接至第一接點及充電控制電路。充電保護電路的一第二端耦接至第二接點及訊號接收電路。充電保護電路具有一第一狀態及一第二狀態。於第一狀態時，充電保護電路導通以使第二接點耦合至第一接點。於第二狀態時，充電保護電路不導通以使第二接點不耦合至第一接點。第一接點及第二接點的其中之一用以耦接至一充電裝置用以輸出一充電電壓或一通訊訊號的一第一輸出端。第三接點用以耦接至充電裝置的一第二輸出端。當第一接點耦接至第一輸出端且第一輸出端輸出充電電壓，充電保護電路切換為第二狀態，以令充電電壓傳遞至充電控制電路。當第二接點耦接至第一輸出端且充電裝置輸出充電電壓，充電保護電路切換為第一狀態，以令充電電壓傳遞至充電控制電路。當第二接點耦接至第一輸出端且充電裝置輸出通訊訊號，充電保護電路切換為第二狀態，以令通訊訊號傳遞至充電控制電路。The embodiment of the present invention discloses a wireless audio output device, which includes a first contact, a second contact, a third contact, a charging control circuit, a signal receiving circuit and a charging protection circuit. The first contact is coupled to a voltage stabilizing capacitor. The third contact is grounded. A first end of the charging protection circuit is coupled to the first contact and the charging control circuit. A second end of the charging protection circuit is coupled to the second contact and the signal receiving circuit. The charging protection circuit has a first state and a second state. In the first state, the charging protection circuit is turned on to couple the second contact to the first contact. In the second state, the charging protection circuit is not turned on so that the second contact is not coupled to the first contact. One of the first contact and the second contact is used for coupling to a first output end of a charging device for outputting a charging voltage or a communication signal. The third contact is used for coupling to a second output end of the charging device. When the first contact is coupled to the first output terminal and the first output terminal outputs the charging voltage, the charging protection circuit switches to the second state, so that the charging voltage is transmitted to the charging control circuit. When the second contact is coupled to the first output terminal and the charging device outputs the charging voltage, the charging protection circuit switches to the first state, so that the charging voltage is transmitted to the charging control circuit. When the second contact is coupled to the first output terminal and the charging device outputs a communication signal, the charging protection circuit switches to the second state, so that the communication signal is transmitted to the charging control circuit.

為了對本發明之上述及其他方面有更佳的瞭解，下文特舉實施例，並配合所附圖式詳細說明如下：In order to have a better understanding of the above-mentioned and other aspects of the present invention, the following specific examples are given in detail with the accompanying drawings as follows:

第1圖繪示根據本發明一實施例的與充電裝置90搭配的無線音訊輸出裝置10的方塊圖。參照第1圖，無線音訊輸出裝置10包括一充電控制電路102、一訊號接收電路104、一充電保護電路106、一第一接點N1、一第二接點N2、一第三接點N3及一穩壓電容C。FIG. 1 shows a block diagram of a wireless audio output device 10 matched with a charging device 90 according to an embodiment of the present invention. 1, the wireless audio output device 10 includes a charging control circuit 102, a signal receiving circuit 104, a charging protection circuit 106, a first contact N1, a second contact N2, a third contact N3 and A voltage stabilizing capacitor C.

無線音訊輸出裝置10通過第一接點N1、第二接點N2及第三接點N3與充電裝置90的一第一輸出端O1及一第二輸出端O2之間的連接進行充電及通訊。詳言之，連接時，第一接點N1及第二接點N2的其中之一耦接至充電裝置90的第一輸出端O1，而第三接點N3耦接至充電裝置90的第二輸出端O2。此外，第三接點N3還耦接至參考接地。The wireless audio output device 10 performs charging and communication through the connection between the first contact N1 , the second contact N2 and the third contact N3 and a first output terminal O1 and a second output terminal O2 of the charging device 90 . Specifically, when connected, one of the first contact N1 and the second contact N2 is coupled to the first output terminal O1 of the charging device 90 , and the third contact N3 is coupled to the second output terminal O1 of the charging device 90 . Output O2. In addition, the third node N3 is also coupled to the reference ground.

充電保護電路106的一第一端耦接至第一接點N1及充電控制電路102。充電保護電路106的一第二端耦接至第二接點N2及訊號接收電路104。第一接點N1耦接穩壓電容C的一第一端。充電保護電路106受控於無線音訊輸出裝置10的一控制單元(未繪示)提供的一控制訊號CS，並視控制訊號CS的狀態而切換於一第一狀態及一第二狀態之間。當充電保護電路106切換至第一狀態時，充電保護電路106將第二接點N2耦接至第一接點N1及充電控制電路102，亦即令第一接點N1與第二接點N2之間短路。當充電保護電路106切換至第二狀態時，充電保護電路106將第二接點N2不耦接至第一接點N1及充電控制電路102，亦即令第一接點N1與第二接點N2之間斷路。A first terminal of the charging protection circuit 106 is coupled to the first node N1 and the charging control circuit 102 . A second terminal of the charging protection circuit 106 is coupled to the second node N2 and the signal receiving circuit 104 . The first node N1 is coupled to a first terminal of the voltage stabilizing capacitor C. As shown in FIG. The charging protection circuit 106 is controlled by a control signal CS provided by a control unit (not shown) of the wireless audio output device 10 , and switches between a first state and a second state depending on the state of the control signal CS. When the charging protection circuit 106 switches to the first state, the charging protection circuit 106 couples the second contact N2 to the first contact N1 and the charging control circuit 102, that is, the connection between the first contact N1 and the second contact N2 short circuit. When the charging protection circuit 106 switches to the second state, the charging protection circuit 106 will not couple the second contact N2 to the first contact N1 and the charging control circuit 102, that is, the first contact N1 and the second contact N2 disconnected.

充電裝置90與無線音訊輸出裝置10之間的操作機制包括一第一應用及一第二應用，視需求來決定。在第一應用中，充電裝置90不僅能夠對無線音訊輸出裝置10進行充電，還能夠與無線音訊輸出裝置10進行通訊。在第二應用中，充電裝置90可只對無線音訊輸出裝置10進行充電，而不與無線音訊輸出裝置10進行通訊。簡言之，充電裝置90是以第一輸出端O1耦接至第一接點N1還是第二接點N2來決定充電裝置90是否具能夠與無線音訊輸出裝置10進行通訊的功能。詳細說明如後。The operation mechanism between the charging device 90 and the wireless audio output device 10 includes a first application and a second application, which are determined according to requirements. In the first application, the charging device 90 can not only charge the wireless audio output device 10 but also communicate with the wireless audio output device 10 . In the second application, the charging device 90 can only charge the wireless audio output device 10 without communicating with the wireless audio output device 10 . In short, whether the charging device 90 is capable of communicating with the wireless audio output device 10 is determined by whether the first output terminal O1 is coupled to the first contact N1 or the second contact N2 . Details are as follows.

在第一應用中，充電裝置90的第一輸出端O1用以提供一充電電壓Vc或輸出一通訊訊號Sc至無線音訊輸出裝置10。在此實施例中，充電裝置90的第一輸出端O1會被耦接至第二接點N2。In the first application, the first output terminal O1 of the charging device 90 is used to provide a charging voltage Vc or output a communication signal Sc to the wireless audio output device 10 . In this embodiment, the first output terminal O1 of the charging device 90 is coupled to the second node N2.

當充電裝置90的第一輸出端O1提供充電電壓Vc時，充電保護電路106回應於控制信號CS的致能狀態而切換為第一狀態，以令第一接點N1與第二接點N2之間短路。充電裝置90提供的充電電壓Vc將經由第一接點N1及充電保護電路106傳遞至充電控制電路102，充電控制電路102根據充電電壓Vc對無線音訊輸出裝置10的一或多個電力儲存單元(未繪示)進行充電，而穩壓電容C做為穩定充電控制電路102接收到的電壓之用。When the first output terminal O1 of the charging device 90 provides the charging voltage Vc, the charging protection circuit 106 is switched to the first state in response to the enable state of the control signal CS, so that the connection between the first contact N1 and the second contact N2 short circuit. The charging voltage Vc provided by the charging device 90 will be transmitted to the charging control circuit 102 through the first contact N1 and the charging protection circuit 106, and the charging control circuit 102 will supply one or more power storage units ( (not shown) for charging, and the voltage stabilizing capacitor C is used for stabilizing the voltage received by the charging control circuit 102 .

當充電裝置90的第一輸出端O1輸出通訊訊號Sc時，充電保護電路106回應於控制訊號CS的禁能狀態而切換為第二狀態，以令第一接點N1與第二接點N2之間斷路。如此一來，在充電裝置90輸出通訊訊號Sc時，通訊訊號Sc可被傳遞至用以接收通訊訊號Sc的訊號接收電路Sc，且由於第一接點N1與第二接點N2之間為斷路，充電裝置90端的輸出負載將不包括穩壓電容C，也就是說能夠減少充電裝置90在與無線音訊輸出裝置10進行通訊時需要推動的負載。When the first output terminal O1 of the charging device 90 outputs the communication signal Sc, the charging protection circuit 106 is switched to the second state in response to the disabled state of the control signal CS, so that the connection between the first contact N1 and the second contact N2 intermittent road. In this way, when the charging device 90 outputs the communication signal Sc, the communication signal Sc can be transmitted to the signal receiving circuit Sc for receiving the communication signal Sc, and since the first contact N1 and the second contact N2 are disconnected , the output load of the charging device 90 does not include the voltage stabilizing capacitor C, that is to say, the load that the charging device 90 needs to push when communicating with the wireless audio output device 10 can be reduced.

在第二應用中，充電裝置90的第一輸出端O1用以輸出充電電壓Vc但不輸出通訊訊號Sc。在此實施例中，充電裝置90的第一輸出端O1會被耦接至第一接點N1。充電保護電路106回應於控制訊號CS的禁能狀態而維持在第二狀態。也就是說，在第二應用中，由於充電裝置90與無線音訊輸出裝置10之間不進行訊號溝通，故第一接點N1與第二接點N2之間可以維持斷路。In the second application, the first output terminal O1 of the charging device 90 is used to output the charging voltage Vc but does not output the communication signal Sc. In this embodiment, the first output terminal O1 of the charging device 90 is coupled to the first contact N1. The charging protection circuit 106 is maintained in the second state in response to the disabled state of the control signal CS. That is to say, in the second application, since there is no signal communication between the charging device 90 and the wireless audio output device 10 , the disconnection between the first contact N1 and the second contact N2 can be maintained.

此外，在一實施例中，在無線音訊輸出裝置10未與充電裝置90連接時，充電保護電路106可維持在第二狀態。In addition, in one embodiment, when the wireless audio output device 10 is not connected to the charging device 90 , the charging protection circuit 106 can maintain the second state.

在第一應用或第二應用下的充電操作中，充電控制電路102皆用以接收充電電壓Vc，並根據充電電壓Vc，以適當電壓及電流對無線音訊輸出裝置10的電力儲存單元進行充電。而在通訊操作中，訊號接收電路104用以接收通訊訊號Sc，並將通訊訊號Sc傳送至無線音訊輸出裝置10的一或多個處理單元(未繪示)。In the charging operation under the first application or the second application, the charging control circuit 102 is used to receive the charging voltage Vc, and charge the power storage unit of the wireless audio output device 10 with an appropriate voltage and current according to the charging voltage Vc. In the communication operation, the signal receiving circuit 104 is used to receive the communication signal Sc, and transmit the communication signal Sc to one or more processing units (not shown) of the wireless audio output device 10 .

在一個實際的例子中，無線音訊輸出裝置10為無線耳機，而充電裝置90為無線耳機的充電盒。在這個例子中，充電裝置90與無線音訊輸出裝置10之間在接點上的連接方式可以是非固定的。也就是說，在無線音訊輸出裝置10的設計階段就需要考量到充電電壓Vc可能自第一接點N1輸入，也可能自第二接點N2輸入。無論充電電壓Vc自第一接點N1輸入或自第二接點N2輸入，都要考量到充電保護電路106處於第二狀態下如何避免漏電流的產生，以及確保充電保護電路106在正確的時間處於正確的狀態(第一狀態或第二狀態)。In a practical example, the wireless audio output device 10 is a wireless earphone, and the charging device 90 is a charging box of the wireless earphone. In this example, the connection between the charging device 90 and the wireless audio output device 10 may be non-fixed. That is to say, in the design stage of the wireless audio output device 10 , it needs to be considered that the charging voltage Vc may be input from the first contact N1 or from the second contact N2 . Regardless of whether the charging voltage Vc is input from the first contact N1 or the second contact N2, it is necessary to consider how to avoid leakage current when the charging protection circuit 106 is in the second state, and to ensure that the charging protection circuit 106 is at the correct time. In the correct state (first state or second state).

第2A圖繪示根據本發明一實施例的充電保護電路106a的電路方塊圖。為更清楚理解，請同時參照第2A圖及第1圖，充電保護電路106a可用以實現第1圖中的充電保護電路106。充電保護電路106a包括一第一電晶體M1。第一電晶體M1的一第一端耦接至第二接點N2。第一電晶體M1的一第二端耦接至第一接點N1(及充電控制電路102)。第一電晶體M1的一控制端耦接至控制單元。第一電晶體M1的一基極浮接(floating)。當第一電晶體M1導通，充電保護電路106a處於第一狀態。當第一電晶體M1截止，充電保護電路106a處於第二狀態。FIG. 2A is a circuit block diagram of the charging protection circuit 106a according to an embodiment of the present invention. For a clearer understanding, please refer to FIG. 2A and FIG. 1 at the same time. The charging protection circuit 106 a can be used to implement the charging protection circuit 106 in FIG. 1 . The charging protection circuit 106a includes a first transistor M1. A first terminal of the first transistor M1 is coupled to the second node N2. A second terminal of the first transistor M1 is coupled to the first contact N1 (and the charging control circuit 102 ). A control terminal of the first transistor M1 is coupled to the control unit. A base of the first transistor M1 is floating. When the first transistor M1 is turned on, the charging protection circuit 106a is in the first state. When the first transistor M1 is turned off, the charging protection circuit 106a is in the second state.

藉由將第一電晶體M1的基極浮接可以允許電流能夠從第二接點N2流向第一接點N1，也能夠從第一接點N1流向第二接點N2。詳而言之，由於在連接充電裝置90之前，充電保護電路106a無法得知充電電壓Vc會由第一接點N1還是第二接點N2輸入，即第一電晶體M1的第一端還是第二端的電壓會較高，故而將第一電晶體M1的基極浮接可通過第一端及第二端中電壓較高者與基極之間的寄生二極體PD1或PD2將基極的電壓上拉至接近於第一電晶體M1的第一端及第二端中電壓較高者的電壓(即第一電晶體M1的第一端及第二端中電壓較高者的電壓減去寄生二極體PD1或PD2的閾值電壓)。隨著基極電壓升高，第一端及第二端中電壓較低者與基極之間的電壓差無法達到寄生二極體的閾值電壓而使之不導通。如此一來，便得以動態決定第一電晶體M1的基極的電壓。當第一電晶體M1的第一端的電壓高於第一電晶體M1的第二端的電壓時，第一電晶體M1的基極電壓會等於第一電晶體M1的第一端的電壓減去寄生二極體PD1的閾值電壓；反之，當第一電晶體M1的第一端的電壓低於第一電晶體M1的第二端的電壓時，第一電晶體M1的基極電壓會等於第一電晶體M1的第二端的電壓減去寄生二極體PD2的閾值電壓。為了清楚說明第一電晶體M1的基極浮接相較於將第一電晶體M1的基極耦接至第一電晶體M1的第一端或第二端(即第一接點N1或第二接點N2)帶來的有益功效，以下將舉出兩種情況進行說明。Floating the base of the first transistor M1 allows current to flow from the second node N2 to the first node N1 and also from the first node N1 to the second node N2. In detail, before the charging device 90 is connected, the charging protection circuit 106a cannot know whether the charging voltage Vc will be input from the first contact N1 or the second contact N2, that is, the first terminal of the first transistor M1 or the second terminal N2. The voltage at the two terminals will be higher, so floating the base of the first transistor M1 can pass the parasitic diode PD1 or PD2 between the first terminal and the second terminal with a higher voltage and the base. The voltage is pulled up to a voltage close to the higher voltage of the first terminal and the second terminal of the first transistor M1 (that is, the voltage of the higher voltage of the first terminal and the second terminal of the first transistor M1 minus Threshold voltage of parasitic diode PD1 or PD2). As the voltage of the base increases, the voltage difference between the lower voltage of the first terminal and the second terminal and the base cannot reach the threshold voltage of the parasitic diode to make it non-conductive. In this way, the voltage of the base of the first transistor M1 can be dynamically determined. When the voltage at the first terminal of the first transistor M1 is higher than the voltage at the second terminal of the first transistor M1, the base voltage of the first transistor M1 will be equal to the voltage at the first terminal of the first transistor M1 minus The threshold voltage of the parasitic diode PD1; on the contrary, when the voltage of the first terminal of the first transistor M1 is lower than the voltage of the second terminal of the first transistor M1, the base voltage of the first transistor M1 will be equal to the first The voltage at the second terminal of the transistor M1 minus the threshold voltage of the parasitic diode PD2. In order to clearly illustrate that the floating base of the first transistor M1 is compared with coupling the base of the first transistor M1 to the first terminal or the second terminal of the first transistor M1 (ie, the first contact N1 or the first terminal N1 The beneficial effect brought by the two contacts N2) will be described below in two cases.

情況一：第一接點N1的電壓高於第二接點N2的電壓，且第一電晶體M1不導通。採用上述實施例將第一電晶體M1的基極浮接時，電流會從第一接點N1通過寄生二極體PD2流往基極，並決定基極的電壓而使寄生二極體PD1截止。因寄生二極體PD1截止，於是不會有漏電流由基極經寄生二極體PD1流向第二接點N2。相對的，若將第一電晶體M1的基極固定耦接至第一接點N1時，電流會從第一接點N1流往基極，並決定基極的電壓而使寄生二極體PD1截止，也不會有漏電流由基極流向第二接點N2。然而，若將第一電晶體M1的基極固定耦接至第二接點N2時，電流會從第一接點N1通過寄生二極體PD2流往基極，再由因固定耦接所建立的路徑從基極流往第二接點N2，而產生漏電流。Case 1: the voltage of the first contact N1 is higher than the voltage of the second contact N2, and the first transistor M1 is not turned on. When the above embodiment is used to float the base of the first transistor M1, the current will flow from the first contact N1 to the base through the parasitic diode PD2, and the voltage of the base is determined so that the parasitic diode PD1 is cut off. . Since the parasitic diode PD1 is cut off, no leakage current will flow from the base to the second contact N2 through the parasitic diode PD1. In contrast, if the base of the first transistor M1 is fixedly coupled to the first contact N1, the current will flow from the first contact N1 to the base, and determine the voltage of the base so that the parasitic diode PD1 When it is turned off, there will be no leakage current flowing from the base to the second contact N2. However, if the base of the first transistor M1 is fixedly coupled to the second node N2, the current will flow from the first node N1 to the base through the parasitic diode PD2, and then established by the fixed coupling The path flows from the base to the second contact N2, thereby generating a leakage current.

情況二：第二接點N2的電壓高於第一接點N1的電壓，且第一電晶體M1不導通。採用上述實施例將第一電晶體M1的基極浮接時，電流會從第二接點N2通過寄生二極體PD1流往基極，並決定基極的電壓而使寄生二極體PD2截止。因寄生二極體PD2截止，於是不會有漏電流由基極經寄生二極體PD2流向第一接點N1。相對的，若將第一電晶體M1的基極固定耦接至第二接點N2時，電流會從第二接點N2流往基極，並決定基極的電壓而使寄生二極體PD2截止，也不會有漏電流由基極流向第一接點N1。然而，若將第一電晶體M1的基極固定耦接至第一接點N1時，電流會從第二接點N2通過寄生二極體PD1流往基極，再由因固定耦接所建立的路徑從基極流往第一接點N1，而產生漏電流。Case 2: the voltage of the second node N2 is higher than the voltage of the first node N1, and the first transistor M1 is not turned on. When the above-mentioned embodiment is used to float the base of the first transistor M1, the current will flow from the second contact N2 to the base through the parasitic diode PD1, and the voltage of the base is determined so that the parasitic diode PD2 is cut off. . Since the parasitic diode PD2 is cut off, no leakage current will flow from the base to the first contact N1 through the parasitic diode PD2. On the contrary, if the base of the first transistor M1 is fixedly coupled to the second contact N2, the current will flow from the second contact N2 to the base, and determine the voltage of the base so that the parasitic diode PD2 When it is turned off, there will be no leakage current flowing from the base to the first contact N1. However, if the base of the first transistor M1 is fixedly coupled to the first node N1, the current will flow from the second node N2 to the base through the parasitic diode PD1, and then the current will be established by the fixed coupling. The path flowing from the base to the first contact N1 generates a leakage current.

由上述說明可知，在無法確定第一接點N1及第二接點N2中何者會是電壓較高的一方的情況下，將第一電晶體M1的基極固定耦接至第一接點N1或第二接點N2皆可能在特定情況下產生漏電流，而增加不必要的電能損耗。上述實施例藉由將第一電晶體M1的基極浮接來有效避免漏電流的產生，從而降低不必要的電能損耗。It can be seen from the above description that, in the case where it is not possible to determine which of the first contact N1 and the second contact N2 will have a higher voltage, the base of the first transistor M1 is fixedly coupled to the first contact N1 Or the second contact N2 may generate a leakage current under certain circumstances, thereby increasing unnecessary power consumption. In the above embodiment, the base of the first transistor M1 is floating to effectively avoid the generation of leakage current, thereby reducing unnecessary power consumption.

請參照第2B圖，第2B圖繪示根據本發明另一實施例的充電保護電路106b的電路方塊圖。充電保護電路106b與第2A圖的充電保護電路106a類似，差別在於充電保護電路106b更包括一第一二極體D1及一第二二極體D2，且充電保護電路106b的第一電晶體M1的基極非浮接。在本實施例中，第一二極體D1的一第一端耦接至第一電晶體M1的第一端，第一二極體D1的一第二端耦接至第一電晶體M1的基極，第二二極體D2的一第一端耦接至第一電晶體M1的第二端，第二二極體D2的一第二端耦接至第一電晶體M1的基極。在本實施例中，第一電晶體M1的基極的電壓可透過實際設置的第一二極體D1或第二二極體D2來決定，而不是透過第一電晶體M1的第一端與基極之間的寄生二極體PD1或第一電晶體M1的第二端與基極之間的寄生二極體PD2決定。然而，充電保護電路106b與充電保護電路106a在操作上仍是類似的。亦即，當第一電晶體M1的第一端的電壓高於第一電晶體M1的第二端的電壓時，第一電晶體M1的基極電壓會等於第一電晶體M1的第一端的電壓減去第一二極體D1的閾值電壓；反之，當第一電晶體M1的第一端的電壓低於第一電晶體M1的第二端的電壓時，第一電晶體M1的基極電壓會等於第一電晶體M1的第二端的電壓減去第二二極體D2的閾值電壓。如此一來，無論第一電晶體M1的第一端與第二端的電壓何者較高，都能避免在特定情況下產生漏電流。Please refer to FIG. 2B. FIG. 2B shows a circuit block diagram of a charging protection circuit 106b according to another embodiment of the present invention. The charging protection circuit 106b is similar to the charging protection circuit 106a in FIG. 2A, the difference is that the charging protection circuit 106b further includes a first diode D1 and a second diode D2, and the first transistor M1 of the charging protection circuit 106b The base is non-floating. In this embodiment, a first end of the first diode D1 is coupled to the first end of the first transistor M1, and a second end of the first diode D1 is coupled to the first end of the first transistor M1. For the base, a first end of the second diode D2 is coupled to the second end of the first transistor M1 , and a second end of the second diode D2 is coupled to the base of the first transistor M1 . In this embodiment, the voltage of the base of the first transistor M1 can be determined through the actual first diode D1 or the second diode D2 instead of the connection between the first terminal of the first transistor M1 and the second diode D2. It is determined by the parasitic diode PD1 between the bases or the parasitic diode PD2 between the second terminal of the first transistor M1 and the base. However, the charging protection circuit 106b is still similar in operation to the charging protection circuit 106a. That is, when the voltage of the first terminal of the first transistor M1 is higher than the voltage of the second terminal of the first transistor M1, the base voltage of the first transistor M1 will be equal to the voltage of the first terminal of the first transistor M1. Voltage minus the threshold voltage of the first diode D1; conversely, when the voltage at the first end of the first transistor M1 is lower than the voltage at the second end of the first transistor M1, the base voltage of the first transistor M1 It will be equal to the voltage of the second terminal of the first transistor M1 minus the threshold voltage of the second diode D2. In this way, no matter the voltage at the first terminal or the second terminal of the first transistor M1 is higher, the leakage current can be avoided under certain conditions.

請參照第3圖，第3圖繪示根據本發明又一實施例的充電保護電路106c的電路方塊圖。充電保護電路106c類似於第2B圖的充電保護電路106b，差別在於充電保護電路106c更包括一或多個第一電阻R1，其中若有多個第一電阻R1，則多個第一電阻R1可通過串聯連接、並聯連接或串並聯混合連接的方式來形成以多個第一電阻R1為基底的電阻電路。此處以串聯連接多個第一電阻R1為例。在此實施例中，串接的多個第一電阻R1連接於第一電晶體M1的第一端與第二端之間，而與第一電晶體M1並聯。Please refer to FIG. 3 , which shows a circuit block diagram of a charging protection circuit 106c according to another embodiment of the present invention. The charging protection circuit 106c is similar to the charging protection circuit 106b in FIG. 2B, the difference is that the charging protection circuit 106c further includes one or more first resistors R1, wherein if there are multiple first resistors R1, the multiple first resistors R1 can be A resistor circuit based on a plurality of first resistors R1 is formed by serial connection, parallel connection or series-parallel hybrid connection. Here, a plurality of first resistors R1 are connected in series as an example. In this embodiment, a plurality of first resistors R1 connected in series are connected between the first terminal and the second terminal of the first transistor M1, and are connected in parallel with the first transistor M1.

在一些應用中，需要識別出充電裝置90是否接入第一接點N1及第二接點N2中的一者。為此，係設置偵測電路(未圖示)來偵測充電裝置90是否接入第一接點N1及第二接點N2中的一者。受惠於第一電晶體M1的設置，達成上述目的所需要的偵測電路的最低數量相對的少，詳細說明如下。In some applications, it is necessary to identify whether the charging device 90 is connected to one of the first contact N1 and the second contact N2 . For this reason, a detection circuit (not shown) is provided to detect whether the charging device 90 is connected to one of the first contact N1 and the second contact N2. Thanks to the arrangement of the first transistor M1, the minimum number of detection circuits required to achieve the above purpose is relatively small, as detailed below.

在一偵測電路直接耦接於第二接點N2的情況中，若充電裝置90接入第二接點N2，由於該偵測電路也是耦接於第二接點N2因而能夠偵測到充電裝置90接入第二接點N2；若充電裝置90接入第一接點N1，充電裝置90在第一接點N1所提供的電壓透過第一電阻R1耦合至第二接點N2，據此直接耦接於第二接點N2的該偵測電路也能夠偵測充電裝置90接入第一接點N1。因此，達成上述目的，所需要的偵測電路的最低數量只要一個。同理，在一偵測電路直接耦接於第一接點N1的情況中，也只需要一個偵測電路就能夠達成上述目的，於此不再贅述。In the case that a detection circuit is directly coupled to the second contact N2, if the charging device 90 is connected to the second contact N2, since the detection circuit is also coupled to the second contact N2, it can detect charging The device 90 is connected to the second contact N2; if the charging device 90 is connected to the first contact N1, the voltage provided by the charging device 90 at the first contact N1 is coupled to the second contact N2 through the first resistor R1, according to which The detection circuit directly coupled to the second contact N2 can also detect that the charging device 90 is connected to the first contact N1. Therefore, to achieve the above object, the minimum number of detection circuits required is only one. Similarly, in the case where a detection circuit is directly coupled to the first contact N1 , only one detection circuit is needed to achieve the above purpose, which will not be repeated here.

請參照第4A圖，第4A圖繪示根據本發明又一實施例的充電保護電路106d的電路方塊圖。充電保護電路106d與第3圖的充電保護電路106c類似，差別在於充電保護電路106d更包括一第二電晶體M2。第二電晶體M2的一第一端及一基極耦接至第一電晶體M1的基極。第二電晶體M2的一第二端耦接至第一電晶體M1的第二端。第二電晶體M2的一控制端耦接至第一電晶體M1的第一端。Please refer to FIG. 4A. FIG. 4A shows a circuit block diagram of a charging protection circuit 106d according to another embodiment of the present invention. The charging protection circuit 106d is similar to the charging protection circuit 106c in FIG. 3 , the difference is that the charging protection circuit 106d further includes a second transistor M2. A first terminal and a base of the second transistor M2 are coupled to the base of the first transistor M1. A second terminal of the second transistor M2 is coupled to the second terminal of the first transistor M1. A control terminal of the second transistor M2 is coupled to the first terminal of the first transistor M1.

在第二應用中，如上所述，充電裝置90由第一接點N1接入，本不應有電流由第一接點N1流向第二接點N2。然而，在一些實施例中，決定控制訊號CS的根據包括第二接點N2的電壓。在上述情況下，當第二接點N2意外地參考接地時，第一電晶體M1可能會因控制訊號CS的電壓相依於第二接點N2的電壓而使得第一電晶體M1的控制端與第二端(第一接點N1)之間電壓差大於第一電晶體M1的閾值電壓而非預期導通令電流通過。藉由設置第二電晶體M2來增加第一電晶體M1的閾值電壓(threshold voltage)，可有效降低甚至避免在第二應用中第二接點N2意外地參考接地時第一電晶體M1有大電流通過的可能性。In the second application, as mentioned above, the charging device 90 is connected through the first contact N1, and no current should flow from the first contact N1 to the second contact N2. However, in some embodiments, the basis for determining the control signal CS includes the voltage of the second node N2. Under the above circumstances, when the second node N2 is accidentally grounded, the first transistor M1 may cause the control terminal of the first transistor M1 to be connected to the second node N2 because the voltage of the control signal CS depends on the voltage of the second node N2. The voltage difference between the second terminal (the first node N1 ) is greater than the threshold voltage of the first transistor M1 and is not turned on as intended to allow the current to flow. By setting the second transistor M2 to increase the threshold voltage (threshold voltage) of the first transistor M1, it is possible to effectively reduce or even prevent the large voltage of the first transistor M1 when the second contact N2 is accidentally referenced to ground in the second application. Possibility of current flow.

具體來說，在一實施例中採用如第6圖所示的控制訊號產生電路60。控制訊號產生電路60包括電晶體M61及M62及電阻R61，而控制訊號CS是根據訊號EN所產生，其中訊號EN為用以決定電晶體M62導通或不導通的致能訊號。在第二應用中，當致能訊號EN令電晶體M62(此例中電晶體M62為NMOS)不導通，第二接點N2為參考接地(第二應用的正常狀況下第二接點N2應為浮接)且電晶體M61(此例子中電晶體M61為PMOS)因第一接點N1的電壓遠大於第二接點N2的電壓而導通時，電晶體M61的汲極電壓（亦即第一電晶體M1的閘極電壓）為電晶體M61（非理想電晶體）的導通電阻與電阻R61的分壓結果，其效果是使第一電晶體M1截止而達到短路保護的目的。然而當此分壓結果與第一接點N1之間的電壓差大於第一電晶體M1的閾值電壓時，第一電晶體M1仍將會導通，進而導致大電流流過第一電晶體M1，仍可能造成第一電晶體M1損壞。增加第一電晶體M1的閾值電壓可提高需要將第一電晶體M1導通所需的閘極-源極電壓差，從而降低第一電晶體M1在上述情況發生時意外導通的機會。具體上，將第二電晶體M2的設置在第一電晶體M1的基極與汲極可增加第一電晶體M1的閾值電壓，來解決上述問題。需說明的是，電晶體的源極及汲極是視其所被施加的電壓來決定，在上述情境中，雖第6圖提供控制訊號CS的電晶體M61的一端標示為源極，但由於第一節點N1的電壓大於第二節點N2，因而所述一端實際上為汲極。Specifically, in one embodiment, a control signal generating circuit 60 as shown in FIG. 6 is used. The control signal generating circuit 60 includes transistors M61 and M62 and a resistor R61, and the control signal CS is generated according to a signal EN, wherein the signal EN is an enable signal for determining whether the transistor M62 is turned on or not. In the second application, when the enable signal EN makes the transistor M62 (transistor M62 is NMOS in this example) non-conductive, the second contact N2 is the reference ground (in the normal condition of the second application, the second contact N2 should be is floating) and the transistor M61 (in this example, the transistor M61 is a PMOS) is turned on because the voltage of the first contact N1 is much greater than the voltage of the second contact N2, the drain voltage of the transistor M61 (that is, the voltage of the second contact N2 The gate voltage of a transistor M1) is the voltage division result of the conduction resistance of the transistor M61 (non-ideal transistor) and the resistor R61, and its effect is to cut off the first transistor M1 to achieve the purpose of short-circuit protection. However, when the voltage difference between the divided voltage result and the first contact N1 is greater than the threshold voltage of the first transistor M1, the first transistor M1 will still be turned on, thereby causing a large current to flow through the first transistor M1, Still may cause damage to the first transistor M1. Increasing the threshold voltage of the first transistor M1 can increase the gate-source voltage difference required to turn on the first transistor M1 , thereby reducing the chance of the first transistor M1 being accidentally turned on when the above situation occurs. Specifically, disposing the second transistor M2 on the base and drain of the first transistor M1 can increase the threshold voltage of the first transistor M1 to solve the above problem. It should be noted that the source and drain of the transistor are determined according to the applied voltage. In the above situation, although one end of the transistor M61 that provides the control signal CS in FIG. 6 is marked as the source, because The voltage of the first node N1 is higher than that of the second node N2, so the one end is actually a drain.

請參照第4B圖，第4B圖繪示根據本發明又一實施例的充電保護電路106e的電路方塊圖。充電保護電路106e與第4A圖的充電保護電路106d類似，差別在於充電保護電路106e包括的第一電阻R1為多個，且第二電晶體M2的控制端是耦接至串聯連接的第一電阻R1的其中之二之間(即，第二電晶體M2的控制端耦接至兩個第一電阻R1之間的串接點)，而不耦接至第一電晶體M1的第一端。第二電晶體M2的控制端通過第一電阻R1中的一或多個耦合至第二接點N2。Please refer to FIG. 4B. FIG. 4B shows a circuit block diagram of a charging protection circuit 106e according to another embodiment of the present invention. The charging protection circuit 106e is similar to the charging protection circuit 106d in FIG. 4A, the difference is that the charging protection circuit 106e includes a plurality of first resistors R1, and the control terminal of the second transistor M2 is coupled to the first resistors connected in series. Between two of R1 (ie, the control terminal of the second transistor M2 is coupled to the series connection point between the two first resistors R1 ), but not coupled to the first terminal of the first transistor M1 . The control terminal of the second transistor M2 is coupled to the second node N2 through one or more of the first resistors R1.

相較於第二電晶體M2的控制端耦接至第一電晶體M1的第一端。本實施例可適用於第二電晶體M2的耐壓較低的情況。例如，充電電壓Vc為5.5V並且該充電電壓Vc提供至第二接點N2，而第二電晶體M2的第一端與第二端之間的耐壓為5V時，通過將第二電晶體M2的控制端的電壓等於第一接點N1與第二接點N2之間的分壓來降低第二電晶體M2的源極與汲極之間的跨壓，可有效避免第二電晶體M2因耐壓不足而損壞，進而提升第二電晶體M2的耐用度。The control terminal of the second transistor M2 is coupled to the first terminal of the first transistor M1. This embodiment is applicable to the case where the withstand voltage of the second transistor M2 is relatively low. For example, when the charging voltage Vc is 5.5V and the charging voltage Vc is supplied to the second contact N2, and the withstand voltage between the first terminal and the second terminal of the second transistor M2 is 5V, the second transistor M2 The voltage at the control terminal of M2 is equal to the divided voltage between the first contact N1 and the second contact N2 to reduce the cross-voltage between the source and drain of the second transistor M2, which can effectively prevent the second transistor M2 from being Insufficient withstand voltage causes damage, thereby improving the durability of the second transistor M2.

請參照第5A圖，第5A圖繪示根據本發明又一實施例的充電保護電路106f的電路方塊圖。充電保護電路106f與第4A圖的充電保護電路106d類似，差別在於充電保護電路106f更包括一第三電晶體M3。第三電晶體M3的一第一端及一基極耦接至第一電晶體M1的基極。第三電晶體M3的一第二端耦接至第一電晶體M1的第一端。第三電晶體M3的一控制端耦接至第一電晶體M1的第二端。第三電晶體M3的作用類似於第二電晶體M2，可增加第一電晶體M1的閾值電壓，進而解決在第一應用中第一接點N1意外地參考接地時第一電晶體M1導通而有大電流通過的問題。Please refer to FIG. 5A , which shows a circuit block diagram of a charging protection circuit 106 f according to another embodiment of the present invention. The charging protection circuit 106f is similar to the charging protection circuit 106d in FIG. 4A, the difference is that the charging protection circuit 106f further includes a third transistor M3. A first terminal and a base of the third transistor M3 are coupled to the base of the first transistor M1. A second terminal of the third transistor M3 is coupled to the first terminal of the first transistor M1. A control terminal of the third transistor M3 is coupled to the second terminal of the first transistor M1. The function of the third transistor M3 is similar to that of the second transistor M2, which can increase the threshold voltage of the first transistor M1, thereby solving the problem that the first transistor M1 is turned on when the first contact N1 accidentally refers to ground in the first application. There is a problem with passing large currents.

請參照第5B圖，第5B圖繪示根據本發明又一實施例的充電保護電路106g的電路方塊圖。充電保護電路106g與第5A圖的充電保護電路106f類似，差別在於充電保護電路106g第二電晶體M2的控制端耦接至串聯連接的第一電阻R1的其中之二之間，而不耦接至第一電晶體M1的第一端，第三電晶體M3的控制端耦接至串聯連接的第一電阻R1的其中之二之間，而不耦接至第一電晶體M1的第二端。相較於充電保護電路106f，第二電晶體M2的源極與汲極之間的跨壓及第三電晶體M3的源極與汲極之間的跨壓可被降低，進而提升第二電晶體M2及第三電晶體M3的耐用度。Please refer to FIG. 5B. FIG. 5B shows a circuit block diagram of a charging protection circuit 106g according to another embodiment of the present invention. The charging protection circuit 106g is similar to the charging protection circuit 106f in FIG. 5A, the difference is that the control terminal of the second transistor M2 of the charging protection circuit 106g is coupled between two of the first resistors R1 connected in series, and is not coupled to to the first terminal of the first transistor M1, the control terminal of the third transistor M3 is coupled between two of the first resistors R1 connected in series, and not coupled to the second terminal of the first transistor M1 . Compared with the charging protection circuit 106f, the cross-voltage between the source and drain of the second transistor M2 and the cross-voltage between the source and drain of the third transistor M3 can be reduced, thereby increasing the voltage of the second transistor M3. Durability of the crystal M2 and the third transistor M3.

需要注意的是，上述各實施例可根據需求適當地混搭使用。例如，在充電保護電路106d至106g中，可將第一二極體D1及第二二極體D2取代為第2A圖的充電保護電路106a的寄生二極體PD1及PD2。再例如，在充電保護電路106c、106d及106f中，可將串聯連接於第一電晶體M1的第一端與第二端之間的一或多個第一電阻R1移除，並針對第一接點N1與第二接點N2分別連接一個偵測電路來確定是否有充電裝置90的接入。It should be noted that the above-mentioned embodiments can be appropriately mixed and matched according to requirements. For example, in the charging protection circuits 106d to 106g, the first diode D1 and the second diode D2 can be replaced by the parasitic diodes PD1 and PD2 of the charging protection circuit 106a in FIG. 2A . For another example, in the charging protection circuits 106c, 106d, and 106f, one or more first resistors R1 connected in series between the first terminal and the second terminal of the first transistor M1 can be removed, and for the first The contact N1 and the second contact N2 are respectively connected to a detection circuit to determine whether the charging device 90 is connected.

本發明的充電保護電路具有避免漏電流的產生的功效之外，更具有在第二應用下第二接點意外地參考接地時的短路保護功能。此外，藉由在第一電晶體的第一端與第二端之間耦接串聯連接的一或多個第一電阻，可免除針對第一接點與第二接點分別設計一套偵測電路的需求。The charging protection circuit of the present invention not only has the effect of preventing leakage current, but also has a short-circuit protection function when the second contact accidentally refers to the ground in the second application. In addition, by coupling one or more first resistors connected in series between the first terminal and the second terminal of the first transistor, it is possible to avoid designing a detection set for the first contact and the second contact respectively. circuit needs.

綜上所述，雖然本發明已以實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾。因此，本發明之保護範圍當視後附之申請專利範圍所界定者為準。To sum up, although the present invention has been disclosed by the above embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application.

10:無線音訊輸出裝置 90:充電裝置 102:充電控制電路 104:訊號接收電路 106、106a~106g:充電保護電路 C:穩壓電容 N1:第一接點 N2:第二接點 N3:第三接點 O1:第一輸出端 O2:第二輸出端 Vc:充電電壓 Sc:通訊訊號 CS:控制訊號 M1:第一電晶體 M2:第二電晶體 M61、M62:電晶體 R61:電阻器 EN:訊號 D1:第一二極體 D2:第二二極體 R1:第一電阻 10: Wireless audio output device 90: charging device 102: Charging control circuit 104: Signal receiving circuit 106, 106a~106g: charging protection circuit C: voltage stabilizing capacitor N1: first contact N2: Second contact N3: The third contact O1: the first output terminal O2: the second output terminal Vc: charging voltage Sc: communication signal CS: control signal M1: the first transistor M2: second transistor M61, M62: Transistor R61: Resistor EN:Signal D1: the first diode D2: second diode R1: the first resistor

第1圖繪示根據本發明一實施例的無線音訊輸出裝置的方塊圖。 第2A圖繪示根據本發明一實施例的充電保護電路的電路方塊圖。 第2B圖繪示根據本發明另一實施例的充電保護電路的電路方塊圖。 第3圖繪示根據本發明又一實施例的充電保護電路的電路方塊圖。 第4A圖繪示根據本發明又一實施例的充電保護電路的電路方塊圖。 第4B圖繪示根據本發明又一實施例的充電保護電路的電路方塊圖。 第5A圖繪示根據本發明又一實施例的充電保護電路的電路方塊圖。 第5B圖繪示根據本發明又一實施例的充電保護電路的電路方塊圖。 第6圖繪示根據本發明又一實施例的控制訊號產生電路的方塊圖。 FIG. 1 is a block diagram of a wireless audio output device according to an embodiment of the present invention. FIG. 2A is a circuit block diagram of a charging protection circuit according to an embodiment of the present invention. FIG. 2B is a circuit block diagram of a charging protection circuit according to another embodiment of the present invention. FIG. 3 is a circuit block diagram of a charging protection circuit according to another embodiment of the present invention. FIG. 4A is a circuit block diagram of a charging protection circuit according to another embodiment of the present invention. FIG. 4B is a circuit block diagram of a charging protection circuit according to another embodiment of the present invention. FIG. 5A is a circuit block diagram of a charging protection circuit according to another embodiment of the present invention. FIG. 5B is a circuit block diagram of a charging protection circuit according to yet another embodiment of the present invention. FIG. 6 is a block diagram of a control signal generating circuit according to another embodiment of the present invention.

10:無線音訊輸出裝置 10: Wireless audio output device

90:充電裝置 90: charging device

102:充電控制電路 102: Charging control circuit

104:訊號接收電路 104: Signal receiving circuit

106:充電保護電路 106: charging protection circuit

C:穩壓電容 C: voltage stabilizing capacitor

N1:第一接點 N1: first contact

N2:第二接點 N2: Second contact

N3:第三接點 N3: The third contact

O1:第一輸出端 O1: the first output terminal

O2:第二輸出端 O2: the second output terminal

Vc:充電電壓 Vc: charging voltage

Sc:通訊訊號 Sc: communication signal

CS:控制訊號 CS: control signal

Claims (8)

一種無線音訊輸出裝置，包括： 一第一接點，耦接至一穩壓電容； 一第二接點； 一第三接點，耦接至參考接地； 一充電控制電路，耦接至該第一接點； 一訊號接收電路，耦接至該第二接點；以及 一充電保護電路，該充電保護電路的一第一端耦接至該第一接點及該充電控制電路，該充電保護電路的一第二端耦接至該第二接點及該訊號接收電路，該充電保護電路具有一第一狀態及一第二狀態，於該第一狀態時，該充電保護電路導通以使該第二接點耦合至該第一接點，於該第二狀態時，該充電保護電路不導通以使該第二接點不耦合至該第一接點， 其中該第一接點及該第二接點的其中之一用以耦接至一充電裝置用以輸出一充電電壓或一通訊訊號的一第一輸出端，該第三接點用以耦接至該充電裝置的一第二輸出端，當該第一接點耦接至該第一輸出端且該充電裝置輸出該充電電壓，該充電保護電路切換為該第二狀態，以令該充電電壓傳遞至該充電控制電路，當該第二接點耦接至該第一輸出端且該充電裝置輸出該充電電壓，該充電保護電路切換為該第一狀態，以令該充電電壓傳遞至該充電控制電路，當該第二接點耦接至該第一輸出端且該充電裝置輸出該通訊訊號，該充電保護電路切換為該第二狀態，以令該通訊訊號傳遞至該訊號接收電路。 A wireless audio output device, comprising: a first contact, coupled to a stabilizing capacitor; a second contact; a third contact, coupled to the reference ground; a charging control circuit coupled to the first contact; a signal receiving circuit coupled to the second contact; and A charging protection circuit, a first terminal of the charging protection circuit is coupled to the first contact and the charging control circuit, a second terminal of the charging protection circuit is coupled to the second contact and the signal receiving circuit , the charging protection circuit has a first state and a second state, in the first state, the charging protection circuit is turned on so that the second contact is coupled to the first contact, in the second state, the charging protection circuit is turned off so that the second contact is not coupled to the first contact, One of the first contact and the second contact is used for coupling to a first output terminal of a charging device for outputting a charging voltage or a communication signal, and the third contact is used for coupling To a second output terminal of the charging device, when the first contact is coupled to the first output terminal and the charging device outputs the charging voltage, the charging protection circuit switches to the second state, so that the charging voltage transmitted to the charging control circuit, when the second contact is coupled to the first output terminal and the charging device outputs the charging voltage, the charging protection circuit switches to the first state, so that the charging voltage is transmitted to the charging A control circuit, when the second contact is coupled to the first output terminal and the charging device outputs the communication signal, the charging protection circuit switches to the second state, so that the communication signal is transmitted to the signal receiving circuit. 如申請專利範圍請求項1所述之無線音訊輸出裝置，其中該充電保護電路包括： 一第一電晶體，該第一電晶體的一第一端耦接至該第二接點，該第一電晶體的一第二端耦接至該第一接點，該第一電晶體的一控制端接收一控制訊號，該第一電晶體的一基極浮接，當該充電保護電路處於該第一狀態時，該第一電晶體受控於該控制訊號導通，當該充電保護電路處於該第二狀態時，該第一電晶體受控於該控制訊號不導通。 The wireless audio output device as described in claim 1 of the scope of the patent application, wherein the charging protection circuit includes: A first transistor, a first terminal of the first transistor is coupled to the second contact, a second terminal of the first transistor is coupled to the first contact, the first transistor A control terminal receives a control signal, a base of the first transistor is floating, when the charging protection circuit is in the first state, the first transistor is controlled by the control signal to conduct, when the charging protection circuit When in the second state, the first transistor is controlled by the control signal to be non-conductive. 如申請專利範圍請求項1所述之無線音訊輸出裝置，其中該充電保護電路包括： 一第一電晶體，該第一電晶體的一第一端耦接至該第二接點，該第一電晶體的一第二端耦接至該第一接點，該第一電晶體的一控制端接收一控制訊號，當該充電保護電路處於該第一狀態時，該第一電晶體受控於該控制訊號導通，當該充電保護電路處於該第二狀態時，該第一電晶體受控於該控制訊號不導通； 一第一二極體，該第一二極體的一第一端耦接至該第一電晶體的一基極，該第一二極體一第二端耦接至該第一電晶體的該第一端；以及 一第二二極體，該第二二極體的一第一端耦接至該第一電晶體的該基極，該第二二極體一第二端耦接至該第一電晶體的該第二端。 The wireless audio output device as described in Claim 1 of the scope of the patent application, wherein the charging protection circuit includes: A first transistor, a first terminal of the first transistor is coupled to the second contact, a second terminal of the first transistor is coupled to the first contact, the first transistor A control terminal receives a control signal, when the charging protection circuit is in the first state, the first transistor is controlled by the control signal to conduct, when the charging protection circuit is in the second state, the first transistor Controlled by the control signal to be non-conductive; A first diode, a first terminal of the first diode is coupled to a base of the first transistor, a second terminal of the first diode is coupled to a base of the first transistor the first end; and A second diode, a first end of the second diode is coupled to the base of the first transistor, a second end of the second diode is coupled to the first transistor the second end. 如申請專利範圍請求項3所述之無線音訊輸出裝置，其中該充電保護電路更包括： 一或多個第一電阻，串聯連接於該第一電晶體的該第一端與該第二端之間。 The wireless audio output device as described in Claim 3 of the scope of the patent application, wherein the charging protection circuit further includes: One or more first resistors are connected in series between the first terminal and the second terminal of the first transistor. 如申請專利範圍請求項4所述之無線音訊輸出裝置，其中該充電保護電路更包括： 一第二電晶體，該第二電晶體的一第一端及一基極耦接至該第一電晶體的該基極，該第二電晶體的一第二端耦接至該第一電晶體的該第二端，該第二電晶體的一控制端耦接至該第一電晶體的該第一端。 The wireless audio output device as described in Claim 4 of the scope of the patent application, wherein the charging protection circuit further includes: A second transistor, a first terminal and a base of the second transistor are coupled to the base of the first transistor, a second terminal of the second transistor is coupled to the first transistor The second terminal of the crystal, a control terminal of the second transistor is coupled to the first terminal of the first transistor. 如申請專利範圍請求項4所述之無線音訊裝置，其中該充電保護電路更包括： 一第二電晶體，該第二電晶體的一第一端及一基極耦接至該第一電晶體的該基極，該第二電晶體的一第二端耦接至該第一電晶體的該第二端，該第二電晶體的一控制端耦接至該一或多個第一電阻的其中之二之間。 The wireless audio device as described in Claim 4 of the scope of the patent application, wherein the charging protection circuit further includes: A second transistor, a first terminal and a base of the second transistor are coupled to the base of the first transistor, a second terminal of the second transistor is coupled to the first transistor The second terminal of the crystal, a control terminal of the second transistor is coupled between two of the one or more first resistors. 如申請專利範圍請求項5所述之無線音訊輸出裝置，其中該充電保護電路更包括： 一第三電晶體，該第三電晶體的一第一端及一基極耦接至該第一電晶體的該基極，該第三電晶體的一第二端耦接至該第一電晶體的該第一端，該第三電晶體的一控制端耦接至該第一電晶體的該第二端。 The wireless audio output device as described in Claim 5 of the scope of the patent application, wherein the charging protection circuit further includes: A third transistor, a first terminal and a base of the third transistor are coupled to the base of the first transistor, a second terminal of the third transistor is coupled to the first transistor The first terminal of the crystal and a control terminal of the third transistor are coupled to the second terminal of the first transistor. 如申請專利範圍請求項6所述之無線音訊裝置，其中該充電保護電路更包括： 一第三電晶體，該第三電晶體的一第一端及一基極耦接至該第一電晶體的該基極，該第三電晶體的一第二端耦接至該第一電晶體的該第一端，該第三電晶體的一控制端耦接至該一或多個第一電阻的其中之二之間。 The wireless audio device as described in claim 6 of the scope of the patent application, wherein the charging protection circuit further includes: A third transistor, a first terminal and a base of the third transistor are coupled to the base of the first transistor, a second terminal of the third transistor is coupled to the first transistor The first end of the crystal and a control end of the third transistor are coupled between two of the one or more first resistors.
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