TWM508809U - Sensing resistor improvement of USB C-type cable - Google Patents
Sensing resistor improvement of USB C-type cable Download PDFInfo
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- TWM508809U TWM508809U TW104210964U TW104210964U TWM508809U TW M508809 U TWM508809 U TW M508809U TW 104210964 U TW104210964 U TW 104210964U TW 104210964 U TW104210964 U TW 104210964U TW M508809 U TWM508809 U TW M508809U
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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
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Description
本創作是有關於一種通用序列匯流排(Universal Serial Bus；USB)C型纜線的感測電阻之改良，特別是關於一種降低靜態電流的感測電阻之改良。This creation is an improvement on the sensing resistance of a Universal Serial Bus (USB) C-type cable, particularly with respect to a sensing resistor that reduces quiescent current.
圖1顯示一種傳統的C型纜線(Type-C cable)2，此C型纜線2的兩端連接在下行資料流程埠(Downstream Facing Port，DFP)以及上行資料流程埠(Upstream Facing Port，UFP)之間。為了讓DFP及UFP可以辨識所連接的纜線是否為C型纜線2，C型纜線2中必需設有固定電阻Ra1及Ra2作為感測電阻，固定電阻Ra1及Ra2的電阻值必須符合USB C型纜線之規範。當C型纜線2接上DFP及UFP時，DFP進入偵測模式，當偵測到C型纜線2中的固定電阻Ra1後，DFP及UFP將進入電源傳遞模式，以提供電源給C型纜線2的控制電路4及6，使控制電路4及6開始操作並將C型纜線2的資訊告知DFP及UFP。但是，當DFP提供電源時，固定電阻Ra1及Ra2上會產生靜態電流Istc及Istc’，造成額外的功率損耗。因此，需要改良現有C型纜線的感測電阻以改善功率損耗。FIG. 1 shows a conventional Type-C cable 2, and both ends of the C-type cable 2 are connected to a Downstream Facing Port (DFP) and an Upstream Facing Port (Upstream Facing Port, Between UFP). In order for DFP and UFP to recognize whether the connected cable is C-type cable 2, fixed resistance Ra1 and Ra2 must be provided as sensing resistors in C-type cable 2. The resistance values of fixed resistors Ra1 and Ra2 must conform to USB. Specification for C-type cable. When the C cable 2 is connected to the DFP and UFP, the DFP enters the detection mode. When the fixed resistor Ra1 in the C cable 2 is detected, the DFP and UFP will enter the power transmission mode to provide power to the C type. The control circuits 4 and 6 of the cable 2 cause the control circuits 4 and 6 to start operating and inform the DFP and UFP of the information of the C-type cable 2. However, when the DFP supplies power, the quiescent currents Istc and Istc' are generated on the fixed resistors Ra1 and Ra2, causing additional power loss. Therefore, there is a need to improve the sensing resistance of existing C-type cables to improve power loss.
本創作的目的，在於提出一種USB C型纜線的感測電阻之改 良。The purpose of this creation is to propose a modification of the sensing resistance of the USB C cable. good.
根據本創作，一種USB C型纜線的感測電阻之改良，其特徵在於，以一可變電阻取代原有的固定電阻作為該感測電阻，該可變電阻在偵測模式時具有一第一電阻值，在電源傳遞模式時具有一第二電阻值，該第一電阻值符合USB C型纜的規範，且該第二電阻值大於該第一電阻值。本創作所改良的感測電阻，在偵測模式時符合USB C型纜的規範，在電源傳遞模式時具有大電阻值以降低或消除靜態電流，減少功率損耗。According to the present invention, an improvement of the sensing resistance of a USB C-type cable is characterized in that a variable resistor is used instead of the original fixed resistor as the sensing resistor, and the variable resistor has a first in the detection mode. A resistance value has a second resistance value in the power transfer mode, the first resistance value conforming to the specification of the USB C cable, and the second resistance value is greater than the first resistance value. The sensing resistor improved by this creation conforms to the specification of the USB C cable in the detection mode, and has a large resistance value in the power transmission mode to reduce or eliminate the quiescent current and reduce the power loss.
根據本創作，一種USB C型纜線的感測電阻之改良，其特徵在於，以串聯的可變電阻及第二固定電阻取代原有的第一固定電阻作為該感測電阻，該串聯的可變電阻及第二固定電阻具有一等效電阻值，該等效電阻值在偵測模式時為一第一電阻值，在電源傳遞模式時為一第二電阻值，該第一電阻值符合USB C型纜的規範，且該第二電阻值大於該第一電阻值。本創作所改良的感測電阻，在偵測模式時符合USB C型纜的規範，在電源傳遞模式時具有大電阻值以降低或消除靜態電流，減少功率損耗。According to the present invention, an improvement of the sensing resistance of a USB C-type cable is characterized in that the first fixed resistor is replaced by a series variable resistor and a second fixed resistor as the sensing resistor. The variable resistor and the second fixed resistor have an equivalent resistance value, which is a first resistance value in the detection mode and a second resistance value in the power transmission mode, the first resistance value conforms to the USB A specification of a C-cable, and the second resistance value is greater than the first resistance value. The sensing resistor improved by this creation conforms to the specification of the USB C cable in the detection mode, and has a large resistance value in the power transmission mode to reduce or eliminate the quiescent current and reduce the power loss.
根據本創作，一種通USB C型纜線的感測電阻之改良，其特徵在於，增加一開關與該感測電阻串聯，該開關在偵測模式時導通，在電源傳遞模式時切斷以消除靜態電流，減少功率損耗。According to the present invention, an improvement of the sensing resistance of the USB C-type cable is characterized in that a switch is added in series with the sensing resistor, the switch is turned on in the detection mode, and is cut off in the power transmission mode to eliminate Quiescent current reduces power loss.
2‧‧‧C型纜線2‧‧‧C cable
4‧‧‧控制電路4‧‧‧Control circuit
6‧‧‧控制電路6‧‧‧Control circuit
圖1顯示傳統的C型纜線；圖2顯示本創作第一實施例；圖3至圖5說明圖2的C型纜線2連接至DFP時的操作； 圖6係圖2中可變電阻Rv之第二實施例；圖7顯示本創作的第二實施例；圖8至圖10說明圖7的C型纜線2連接至DFP時的操作；圖11係圖7中可變電阻Rv之第一實施例；圖12係圖7中可變電阻Rv之第二實施例；以及圖13顯示本創作的第三實施例。1 shows a conventional C-type cable; FIG. 2 shows a first embodiment of the present creation; and FIGS. 3 to 5 illustrate the operation when the C-type cable 2 of FIG. 2 is connected to a DFP; Figure 6 is a second embodiment of the variable resistor Rv of Figure 2; Figure 7 shows a second embodiment of the present invention; Figures 8 through 10 illustrate the operation of the C-cable 2 of Figure 7 when connected to a DFP; Figure 11 A first embodiment of the variable resistor Rv in Fig. 7; Fig. 12 is a second embodiment of the variable resistor Rv in Fig. 7; and Fig. 13 shows a third embodiment of the present invention.
圖2顯示使用本創作改良之感測電阻的C型纜線2，為了方便說明，圖2僅顯示C型纜線2的部分電路。圖2的實施例是以可變電阻Rv取代圖1中原本的固定電阻Ra1作為感測電阻，圖2雖然只以改良圖1中的電阻Ra1為例，但同樣適用來改良圖1中的電阻Ra2。圖3至圖5說明圖2的C型纜線2連接至DFP時的操作，如圖3所示，當C型纜線2剛連接至DFP時，DFP將接腳VCONN 連接至Td端以進入偵測模式並送出一偵測電流Idet通過作為感測電阻的可變電阻Rv，此時可變電阻Rv的電阻值符合USB C型纜線的規範，因此DFP根據接腳VCONN 的電壓可正確辨識所連接的纜線為C型纜線2。接著，如圖4所示，DFP將接腳VCONN 連接至Tp端進入電源傳輸模式，此時可變電阻Rv上將產生靜態電流Istc，同時控制電路4也因DFP提供的電源而開始運作。如圖5所示，開始運作後的控制電路4將送出控制信號Vc提高可變電阻Rv的電阻值，以降低靜態電流Istc。當可變電阻Rv的電阻值趨近無限大時，靜態電流Istc將趨近0。2 shows a C-type cable 2 using the improved sense resistor of the present invention. For convenience of explanation, FIG. 2 shows only a part of the circuit of the C-type cable 2. The embodiment of FIG. 2 replaces the original fixed resistor Ra1 of FIG. 1 as a sense resistor with a variable resistor Rv. Although FIG. 2 is only an example of improving the resistor Ra1 of FIG. 1, the same applies to improving the resistor of FIG. Ra2. 3 to FIG. 5 illustrate the operation when the C-type cable 2 of FIG. 2 is connected to the DFP. As shown in FIG. 3, when the C-type cable 2 is just connected to the DFP, the DFP connects the pin V CONN to the Td end. Entering the detection mode and sending a detection current Idet through the variable resistance Rv as the sensing resistor. At this time, the resistance value of the variable resistor Rv conforms to the specification of the USB C-type cable, so the DFP can be based on the voltage of the pin V CONN . Correctly identify the connected cable as C-type cable 2. Next, as shown in FIG. 4, the DFP connects the pin V CONN to the Tp terminal to enter the power transmission mode, at which time the quiescent current Istc is generated on the variable resistor Rv, and the control circuit 4 also starts operating due to the power supply provided by the DFP. As shown in FIG. 5, the control circuit 4 after the start of operation increases the resistance value of the variable resistor Rv by the send control signal Vc to lower the quiescent current Istc. When the resistance value of the variable resistor Rv approaches infinity, the quiescent current Istc will approach zero.
本創作亦可使用數位控制的架構來實現。圖6係圖2中可變電阻Rv之實施例，其係用多個電阻R1及R2及多個開關Q1及Q2組成可變電阻 Rv。如圖6所示，將串聯的電阻R1及開關Q1與串聯的電阻R2及開關Q2並聯，藉由控制開關Q1及Q2導通或切斷，可以控制電阻R1及R2之間的連接狀態，進而改變可變電阻Rv的電阻值。This creation can also be implemented using a digitally controlled architecture. 6 is an embodiment of the variable resistor Rv of FIG. 2, which is composed of a plurality of resistors R1 and R2 and a plurality of switches Q1 and Q2 Rv. As shown in FIG. 6, the series resistor R1 and the switch Q1 are connected in parallel with the series resistor R2 and the switch Q2. By controlling the switches Q1 and Q2 to be turned on or off, the connection state between the resistors R1 and R2 can be controlled, thereby changing. The resistance value of the variable resistor Rv.
圖7顯示本創作的第二實施例，為了方便說明，圖7僅顯示C型纜線2的部分電路。圖7的實施例是以串聯的可變電阻Rv及固定電阻R3取代圖1中原本的固定電阻Ra1作為感測電阻，串聯的可變電阻Rv及固定電阻R3具有等效電阻值Req。圖7雖然只以改良圖1中的電阻Ra1為例，但同樣適用來改良圖1中的電阻Ra2。圖8至圖10說明圖7的C型纜線2連接至DFP時的操作。如圖8所示，當C型纜線2剛連接至DFP時，DFP將接腳VCONN 連接至Td端以進入偵測模式並送出一偵測電流Idet通過作為感測電阻的可變電阻Rv及固定電阻R3，此時串聯的可變電阻Rv及固定電阻R3的等效電阻值Req符合USB C型纜線的規範，因此DFP根據接腳VCONN 的電壓可正確辨識所連接的纜線為C型纜線2。接著，如圖9所示，DFP將接腳VCONN 連接至Tp端進入電源傳輸模式，此時將產生靜態電流Istc通過可變電阻Rv及固定電阻R3，同時控制電路4也因DFP提供的電源而開始運作。如圖10所示，開始運作後的控制電路4將送出控制信號Vc提高可變電阻Rv的電阻值，進而增加等效電阻值Req以降低靜態電流Istc。當等效電阻值Req趨近無限大時，靜態電流Istc將趨近0。Fig. 7 shows a second embodiment of the present creation, and for convenience of explanation, Fig. 7 shows only a part of the circuit of the C-type cable 2. The embodiment of FIG. 7 replaces the original fixed resistor Ra1 of FIG. 1 as a sense resistor with a series-connected variable resistor Rv and a fixed resistor R3, and the series-connected variable resistor Rv and the fixed resistor R3 have an equivalent resistance value Req. Although FIG. 7 is merely an example of improving the resistor Ra1 of FIG. 1, the same applies to improving the resistor Ra2 of FIG. 8 to 10 illustrate the operation when the C-type cable 2 of Fig. 7 is connected to the DFP. As shown in FIG. 8, when the C-type cable 2 is just connected to the DFP, the DFP connects the pin V CONN to the Td terminal to enter the detection mode and sends a detection current Idet through the variable resistance Rv as the sensing resistor. And the fixed resistor R3, the equivalent resistance value Req of the series connected variable resistor Rv and the fixed resistor R3 meets the specification of the USB C type cable, so the DFP can correctly identify the connected cable according to the voltage of the pin V CONN . Type C cable 2. Next, as shown in FIG. 9, the DFP connects the pin V CONN to the Tp terminal to enter the power transmission mode, at which time the quiescent current Istc is generated through the variable resistor Rv and the fixed resistor R3, and the control circuit 4 is also powered by the DFP. And it started to work. As shown in FIG. 10, the control circuit 4 after the start of operation increases the resistance value of the variable resistor Rv by the supply control signal Vc, thereby increasing the equivalent resistance value Req to lower the quiescent current Istc. When the equivalent resistance value Req approaches infinity, the quiescent current Istc will approach zero.
如圖11所示，圖7中的可變電阻Rv可以用負臨界電壓的電晶體TR來實現，藉由控制信號Vc來控制電晶體TR的導通阻值，進而控制等效電阻值Req。As shown in FIG. 11, the variable resistor Rv in FIG. 7 can be realized by a transistor TR of a negative threshold voltage, and the conduction resistance value of the transistor TR is controlled by the control signal Vc, thereby controlling the equivalent resistance value Req.
圖7的實施例亦可使用數位控制的架構來實現。圖12顯示使 用多個電阻R1及R2及多個開關Q1及Q2組成可變電阻Rv的實施例。如圖12所示，將串聯的電阻R1及開關Q1與串聯的電阻R2及開關Q2並聯，控制電路4提供一組數位信號Vc1及Vc2控制開關Q1及Q2導通或切斷，以調整可變電阻Rv的電阻值，進而調整等效電阻值Req。The embodiment of Figure 7 can also be implemented using a digitally controlled architecture. Figure 12 shows the making An embodiment in which the variable resistor Rv is composed of a plurality of resistors R1 and R2 and a plurality of switches Q1 and Q2. As shown in FIG. 12, the series resistor R1 and the switch Q1 are connected in parallel with the series resistor R2 and the switch Q2, and the control circuit 4 provides a set of digital signals Vc1 and Vc2 to control the switches Q1 and Q2 to be turned on or off to adjust the variable resistor. The resistance value of Rv, and then the equivalent resistance value Req.
圖13顯示本創作的第三實施例，為了方便說明，圖13僅顯示C型纜線2的部分電路。圖13的實施例是增加一開關Q3與原來作為感測電阻的固定電阻Ra1串聯，開關Q3是使用負臨界電壓的電晶體來實現，因此在偵測模式時，開關Q3是處於導通狀態，因此DFP可偵測到固定電阻Ra1，在進入電源傳輸模式後，控制電路4送出控制信號Vc以切斷開關Q3，進而切斷電流路徑以消除靜電電流Istc。圖13雖然只以改良圖1中的電阻Ra1為例，但同樣適用來改良圖1中的電阻Ra2。Fig. 13 shows a third embodiment of the present creation, and for convenience of explanation, Fig. 13 shows only a part of the circuit of the C-type cable 2. The embodiment of FIG. 13 is to add a switch Q3 in series with a fixed resistor Ra1 which is originally used as a sense resistor, and the switch Q3 is implemented by a transistor using a negative threshold voltage. Therefore, in the detection mode, the switch Q3 is in an on state, The DFP can detect the fixed resistance Ra1. After entering the power transmission mode, the control circuit 4 sends out the control signal Vc to cut off the switch Q3, thereby cutting off the current path to eliminate the static current Istc. Although FIG. 13 is merely an example of improving the resistor Ra1 of FIG. 1, the same applies to the improvement of the resistor Ra2 of FIG.
2‧‧‧C型纜線2‧‧‧C cable
4‧‧‧控制電路4‧‧‧Control circuit
Claims (7)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104210964U TWM508809U (en) | 2015-07-07 | 2015-07-07 | Sensing resistor improvement of USB C-type cable |
| CN201520563069.5U CN204791001U (en) | 2015-07-07 | 2015-07-30 | universal serial bus C-type cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104210964U TWM508809U (en) | 2015-07-07 | 2015-07-07 | Sensing resistor improvement of USB C-type cable |
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| Publication Number | Publication Date |
|---|---|
| TWM508809U true TWM508809U (en) | 2015-09-11 |
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|---|---|---|---|
| TW104210964U TWM508809U (en) | 2015-07-07 | 2015-07-07 | Sensing resistor improvement of USB C-type cable |
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| CN (1) | CN204791001U (en) |
| TW (1) | TWM508809U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI614611B (en) * | 2016-05-18 | 2018-02-11 | 聯陽半導體股份有限公司 | Method for detecting resistance values of external resistors under a universal serial bus based downstream facing port device and system thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11018498B2 (en) | 2017-03-31 | 2021-05-25 | Via Labs, Inc. | Emarker-equipped cable and power management method thereof |
| CN107783929A (en) * | 2017-03-31 | 2018-03-09 | 威盛电子股份有限公司 | Electronic marker and associated cable and method |
-
2015
- 2015-07-07 TW TW104210964U patent/TWM508809U/en unknown
- 2015-07-30 CN CN201520563069.5U patent/CN204791001U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI614611B (en) * | 2016-05-18 | 2018-02-11 | 聯陽半導體股份有限公司 | Method for detecting resistance values of external resistors under a universal serial bus based downstream facing port device and system thereof |
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| CN204791001U (en) | 2015-11-18 |
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