CN106201955B - Bus device - Google Patents
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- CN106201955B CN106201955B CN201510214238.9A CN201510214238A CN106201955B CN 106201955 B CN106201955 B CN 106201955B CN 201510214238 A CN201510214238 A CN 201510214238A CN 106201955 B CN106201955 B CN 106201955B
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Abstract
The invention relates to a bus device for transmitting information on a bus by means of a plurality of levels, said bus device comprising at least: a high-level switch module having a control terminal, an input terminal and an output terminal, wherein the input terminal and the output terminal are respectively connected to a power input terminal of the bus device and a first point connectable to the bus; a low-level switch module having a control terminal, an input terminal, and an output terminal, wherein the input terminal and the output terminal of the low-level switch module are connected to the first point and a ground terminal of the bus device, respectively; a first resistor connected between the first point and ground; a charging module connected to the first point; a control module for controlling the charging module to supply current to the bus based on control signals provided to the control terminal of the high-side switch module and the control terminal of the low-side switch module. With this bus device, the effective communication distance of the bus can be extended at low cost.
Description
Technical Field
The present invention relates to a bus apparatus.
Background
A bus is a common communication trunk that carries information between various devices, and is a transmission line bundle composed of wires. In order to be able to transmit information via a bus, a device is usually equipped with bus means and sends and/or receives information on the bus by controlling the equipped bus means.
Typical bus standards currently include RS323, RS485, etc., but the effective communication distances that these bus standards can support are limited. For example, the bus standard RS485 can only support an effective communication distance of 1.5 km.
In order to extend the effective communication distance of the bus, some solutions have been proposed. For example, optical fibers are used as buses to extend the effective communication distance of the buses, but such a solution is relatively costly.
Disclosure of Invention
In view of the above drawbacks of the prior art, embodiments of the present invention provide a bus device capable of extending an effective communication distance of a bus at a low cost.
A bus apparatus according to an embodiment of the present invention, a bus apparatus that transmits information on a bus by a plurality of levels, the bus apparatus comprising at least: a high-level switch module having a control terminal, an input terminal and an output terminal, wherein the input terminal and the output terminal are respectively connected to a power input terminal of the bus device and a first point connectable to the bus; a low-level switch module having a control terminal, an input terminal, and an output terminal, wherein the input terminal and the output terminal of the low-level switch module are connected to the first point and a ground terminal of the bus device, respectively; a first resistor connected between the first point and ground; a charging module connected to the first point; and a control module for controlling the charging module to supply the current to the bus based on control signals provided to the control terminals of the high-side switch module and the low-side switch module, wherein the plurality of levels include a first level, a second level and a third level, the second level is greater than the first level and less than the third level, and the control module is further configured to provide a charging instruction signal to the charging module to control the charging module to supply the current to the bus when it is detected from the control signals that the level supplied to the bus by the bus device changes from the first level to the second level.
The control module is further configured to stop providing the charging instruction signal to the charging module to control the charging module to stop providing the current to the bus when it is detected according to the control signal that the level provided by the bus device to the bus is not changed from the first level to the second level.
Wherein, the high-order switch module includes first controllable switch device and second resistance at least, wherein, the control end, input and the output of first controllable switch device are connected respectively the control end, input and the output of high-order switch module, and, the both ends of second resistance are connected respectively the input and the output of high-order switch module, and, the low-order switch module includes second controllable switch device and third resistance, wherein, the both ends of third resistance are connected respectively the input of high-order switch module with the input of second controllable switch device, and, the control end and the output of second controllable switch device are connected respectively the control end and the output of low-order switch module.
Wherein the resistance value of the first resistor is greater than the resistance value of the third resistor.
Wherein the charging module comprises a power supply module and a third controllable switching device, wherein the power supply module is connected to the first point via the third controllable switching device, a control terminal of the third controllable switching device is connected to the control module, and when receiving the charging instruction signal from the control module, the third switching element is in a conducting state so that the power supply module supplies current to the bus via the first point.
Wherein the resistance value of the third resistor is less than 100 ohms.
Wherein the control module determines that the level provided by the bus apparatus to the bus changes from the first level to the second level when the first controllable switching device is in an off state and the second controllable switching device changes from an on state to an off state as a result of detecting the control signal.
As can be seen from the above description, the bus device according to the embodiment of the present invention includes the charging module and the control module, and the control module controls the charging module to supply current to the bus when the level supplied to the bus by the bus device changes from the first level, which is a low level, to the second level, which is an intermediate level, so that the entire line of the bus reaches the second level faster, thereby reducing the level transition time constant of the bus and extending the effective communication distance of the bus, and the charging module and the control module included in the bus device have low costs, thereby extending the effective communication distance of the bus at a lower cost compared to the related art.
Drawings
Other features, characteristics, benefits and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
Fig. 1 shows a schematic diagram of a conventional bus arrangement.
Fig. 2 shows a schematic diagram of a bus arrangement according to an embodiment of the invention.
Detailed Description
Before describing in detail various embodiments of the present invention, the following first analyzes factors that affect the effective communication distance of the bus.
Fig. 1 shows a schematic diagram of a conventional bus arrangement. As shown in fig. 1, the bus device 10 has a power supply input terminal a connectable to a power supply, a point B, and a ground terminal C connectable to ground. The bus device 10 is connected to the bus T through a point B.
The bus device 10 includes a high-side switch module 20, a low-side switch module 30, a resistor 40, and a receiving module 50.
The high-order switch module 20 has a control terminal I11, an input terminal I12 and an output terminal I13, and is connected between the power input terminal a and the point B of the bus device 10, i.e., the input terminal I12 and the output terminal I13 of the high-order switch module 20 are respectively connected to the power input terminal a and the point B of the bus device 10. The high-side switching module 20 includes a controllable switching device Q1, a diode D1, and a resistor R1. The diode D1 and the resistor R1 are connected in series, and two ends of the diode D1 and the resistor R1 which are connected in series are respectively connected to the input end I12 and the output end I13 of the high-order switch module 20. The control terminal, the input terminal and the output terminal of the controllable switching device Q1 are connected to the control terminal I11, the input terminal I12 and the output terminal I13 of the high-side switch module 20, respectively. The resistance value of the resistor R1 is 2000 ohms.
The low switch module 30 has a control terminal I21, an input terminal I22 and an output terminal I23, and is connected between the point B and the ground terminal C of the bus device 10, i.e., the input terminal I22 and the output terminal I23 of the low switch module 30 are connected to the point B and the ground terminal C of the bus device 10, respectively. The low side switching module 30 may include a resistor R2 and a controllable switching device Q2. The resistor R2 is connected in series with the controllable switch device Q2, specifically, two ends of the resistor R2 are respectively connected to the input terminal I22 of the low-level switch module 30 and the input terminal of the controllable switch device Q2, and the control terminal and the output terminal of the controllable switch device Q2 are respectively connected to the control terminal I21 and the output terminal I23 of the low-level switch module 30. The resistance value of the resistor R2 is 100 ohms.
The receiving module 50 is connected to point B. When the bus arrangement 10 is in the information receiving phase, the receiving module 50 receives information from the bus T via the point B and transmits the received information to the device equipped with the bus arrangement 10.
When the bus arrangement 10 is in the information transmission phase, the device equipped with the bus arrangement 10 will send control signals to the control terminals of the controllable switching devices Q1 and Q2 in the bus arrangement 10 (i.e. the control terminal I11 of the high-order switching module 20 and the control terminal I21 of the low-order switching module 30) to control the controllable switching devices Q1 and Q2 to be turned ON (ON) or OFF (OFF), thereby providing different levels for representing different information to the bus T via point B to enable the information to be transmitted ON the bus T. Among them, the controllable switching devices Q1 and Q2 are controlled such that the levels provided by the bus apparatus 10 to the bus T via the point B include a low level (first level) F1, an intermediate level (second level) F2, and a high level (third level) F3, and the intermediate level F2 is greater than the low level F1 and less than the high level F3. Here, if the controllable switching device Q1 is turned OFF (OFF) and the controllable switching device Q2 is turned ON (ON), the bus apparatus 10 supplies the low level F1 to the bus T via the point B. If the controllable switching device Q1 is turned OFF (OFF) and the controllable switching device Q2 is turned OFF (OFF), the bus arrangement 10 provides the intermediate level F2 to the bus T via point B. If the controllable switching device Q1 is ON (ON) and the controllable switching device Q2 is OFF (OFF), the bus apparatus 10 supplies a high level F3 to the bus T via a point B.
When transmitting information on the bus T, the bus device 10 generates four level transitions on the bus T via point B, namely: (I) transition from high F3 to low F1; (II) transition from low level F1 to intermediate level F2; (iii) transition from mid level F2 to high level F3; and, (iv) transition from low F1 to high F3.
The bus T may be equivalent in circuit analysis to a resistor R0 and a capacitor C0 connected together in series. Assuming that the bus means 10 is connected at one of the ends of the bus T and a receiving device JS (not shown) for receiving information issued by the bus means 10 is connected at the other end of the bus T, it takes some time for the bus means 10 to pass on to the other end of the bus T to reach the receiving device JS when the bus means 10 changes from one of the levels to the other on the one end of the bus T due to the influence of the capacitance C0 that the bus T has, wherein the time required is referred to as the level transition time constant of the bus. The effective communication distance of the bus is related to the level transition time constant of the bus, wherein the smaller the level transition time constant of the bus, the longer the effective communication distance of the bus.
Specifically, for the aforementioned type i level transition, the level transition time constant of the bus is [ R2+ R0] × C0; for the second level shift, the bus has a level shift time constant of [ R1+ R0] C0; for the aforementioned type iii level shift, the bus has a level shift time constant of [ R1(ON) + R0] C0; for the aforementioned type iv level shifting, the bus has a level shifting time constant of [ R1(ON) + R0] C0. Wherein R1, R2, R0, C0 and R1(ON) used in the above formula for calculating the time constant represent the resistance value of the resistor R1, the resistance value of the resistor R2, the resistance value of the bus T, the capacitance value of the bus T and the resistance value of the controllable switching device Q1 in the ON state, respectively. In the selected condition of the bus, the resistance R0 and the capacitance C0 of the bus are generally fixed and the resistance of the controllable switching device in the on state is generally small and negligible. Therefore, it is difficult to reduce the bus level transition time constant for the aforementioned III and IV level transitions. For the aforementioned type i and type ii level shifting, if the influence of the resistor R1 and the resistor R2 on the level shifting time constant of the bus can be reduced or eliminated, the level shifting time constant of the bus can be reduced, thereby prolonging the effective communication distance of the bus.
Based on the above analysis, the inventors have made the present invention, which reduces the level shift time constant of the bus line by reducing or eliminating the influence of the resistor R1 and the resistor R2 on the level shift time constant of the bus line at a lower cost, thereby extending the effective communication distance of the bus line.
Referring now to FIG. 2, shown is a schematic diagram of a bus arrangement in accordance with one embodiment of the present invention. As shown in fig. 2, the bus device 200 includes a high-side switch module 300, a low-side switch module 400, a resistor 500, a charging module 600, a control module 700, and a receiving module 800. Like the bus device 10 in fig. 1, the bus device 200 also transmits information on the bus T by three levels of a low level (first level) F1, an intermediate level (second level) F2, and a high level (third level) F3.
The high-side switch module 300 is connected between the power input D of the bus device 200 and a point E via which the bus device 200 is connected to the bus T. The high-side switch module 300 is identical to the high-side switch module 20 of fig. 1, and a detailed description thereof will be omitted.
The low-side switch module 400 is connected between the point E and the ground terminal F of the bus device 200. The structure of the low-side switch module 400 is the same as that of the low-side switch module 30 in fig. 1, but the resistance value of the resistor R2 of the low-side switch module 400 is smaller than that of the resistor R2 of the low-side switch module 30 in fig. 1, that is, the resistance value of the resistor R2 of the low-side switch module 400 is less than 100 ohms, preferably 5 ohms.
The charging module 600 is connected to a point E and the control module 700 for supplying current to the bus T via the point E when a charging command signal is received from the control module 700.
The charging module 600 may comprise a power supply module 610 and a controllable switching device 640, wherein the power supply module 610 is connected to point E via the controllable switching device 640, i.e. the input and output of the controllable switching device 640 are connected to the power supply module 610 and to point E, respectively, and the control terminal of the controllable switching device 640 is connected to the control module 700. The power module 610 may be powered by a battery or may draw power from a device equipped with the bus apparatus 200 as a power source. When receiving the charging command signal from the control module 700, the controllable switching device 640 is in a conductive state, so that the power supply module 610 supplies current to the bus T via the controllable switching device 640 and the point E. When the control module 700 stops outputting the charging instruction signal to the controllable switching device 640, the controllable switching device 640 is in an off state, so that the power supply module 610 stops supplying current to the bus T.
The controllable switching devices Q1, Q2, and 640 may be any controllable switching device including, but not limited to, a transistor, a thyristor, a mosfet, and the like.
The control module 700 is used for controlling the charging module 600 to supply current to the bus T according to the control signals provided to the control terminal I11 of the high-side switch module 300 and the control terminal I21 of the low-side switch module 400. Specifically, the control module 700 determines whether the level supplied from the bus apparatus 200 to the bus T is changed from the low level F1 to the intermediate level F2 (i.e., the aforementioned second level transition) via the point E, supplies the charging command signal to the charging module 600 when the determination result is affirmative, and stops supplying the charging command signal to the charging module 600 when the determination result is negative, based on a control signal (i.e., a control signal supplied to the control terminal of the controllable switching device Q1 of the high-order switching module 300) for controlling the controllable switching device Q1 of the high-order switching module 300 to be turned on or off and a control signal (i.e., a control signal supplied to the control terminal of the controllable switching device Q2 of the low-order switching module 400) for controlling the controllable switching device Q2 of the low-order switching module 400 to be turned on or off, which are transmitted from the apparatus equipped with the bus apparatus 200.
For example, when detecting the control signals for the controllable switching device Q1 and the controllable switching device Q2 that the controllable switching device Q1 is in the OFF state (OFF) but the controllable switching device Q2 changes from the ON state (ON) to the OFF state (OFF), the control block 700 determines that the level supplied from the bus apparatus 200 to the bus T via the point E changes from the low level F1 to the intermediate level F2, thereby supplying the charging command signal to the charging block 600.
The control module 700 may be implemented using integrated circuits, firmware, or a combination of integrated circuits and microprocessors.
The receiving module 800 is connected to point E. When the bus apparatus 200 is in the information receiving phase, the receiving module 800 receives information from the bus T via the point E and transmits the received information to the device equipped with the bus apparatus 200. The receiving module 800 is the same as the receiving module 50 in fig. 1, and a detailed description thereof is omitted.
As can be seen from the above description, the bus device 200 of the present embodiment includes the charging module 600 and the control module 700, and the control module 700 controls the charging module 600 to supply current to the bus T when detecting that the level supplied from the bus device 200 to the bus T changes from the low level F1 to the intermediate level F2 (i.e., the aforementioned second level transition), so that, when the level supplied from the bus device 200 to the bus T changes from the low level F1 to the intermediate level F2 (i.e., the aforementioned second level transition), in addition to supplying current to the bus T via the branch where the diode D1 and the resistor R1 are located, the bus device 200 supplies current to the bus T through the charging module 600, so that current is supplied to the bus T simultaneously via both the branch where the diode D1 and the resistor R1 and through the charging module 600, compared with supplying current to the bus T via only the branch where the diode D1 and the resistor R1 are located, the level of the whole line of the bus T is promoted to the intermediate level F2 more quickly, thereby eliminating the influence of the resistor R1 on the level transition time constant of the bus in the second level transition, reducing the level transition time constant of the bus and prolonging the effective communication distance of the bus.
Further, the resistance value of the resistor R2 of the present embodiment is smaller than that of the conventional resistor R2 shown in fig. 1, so that, for the aforementioned type i level shift, the present embodiment reduces the level shift time constant of the bus line compared to the conventional art shown in fig. 1, thereby extending the effective communication distance of the bus line.
Also, it is less costly to include the charging module 600 and the control module 700 in the bus device 200 and to select the resistor R2 with a smaller resistance value in the bus device 200 than to use an optical fiber as a bus.
Other variants
It should be understood by those skilled in the art that although in the above embodiment, the effective communication distance of the bus is extended by both the bus device 200 including the charging module 600 and the control module 700 and making the resistance value of the resistor R2 in the bus device 200 smaller, the present invention is not limited thereto. In other embodiments of the present invention, it is also possible that only the bus device 200 includes the charging module 600 and the control module 700, and the resistance value of the resistor R2 in the bus device 200 is unchanged compared with the prior art.
It will be appreciated by those skilled in the art that in the event that the resistance value of the resistor R2 in the bus arrangement 200 becomes smaller, a controllable switching device having a higher operating power may be used for the controllable switching device Q2 in the bus arrangement 200.
It will be understood by those skilled in the art that the bus arrangement 200 may not comprise the receiving module 800 if the bus arrangement 200 is only used for transmitting information on the bus and not for receiving information.
It will be understood by those skilled in the art that the bus device 200 may not include the diode D1 if the bus device 200 is only used to send information on the bus and not to receive information.
It will be appreciated by those skilled in the art that although in the above embodiments the inventive arrangements are applicable to the case of information being transmitted on a bus using three levels, the invention is not limited thereto. In some other embodiments of the invention, the scheme of the invention is also applicable to the case of transmitting information on the bus using two or more levels.
Those skilled in the art will appreciate that various modifications, adaptations, and variations may be made to the various embodiments disclosed above without departing from the spirit of the invention, and that such modifications, adaptations, and variations are intended to be within the scope of the invention. The scope of the invention is therefore defined by the appended claims.
Claims (7)
1. A bus device for transmitting information on a bus by means of a plurality of levels, the bus device comprising at least:
a high-level switch module having a control terminal, an input terminal and an output terminal, wherein the input terminal and the output terminal are respectively connected to a power input terminal of the bus device and a first point connectable to the bus;
a low-level switch module having a control terminal, an input terminal, and an output terminal, wherein the input terminal and the output terminal of the low-level switch module are connected to the first point and a ground terminal of the bus device, respectively;
a first resistor connected between the first point and ground;
a charging module connected to the first point; and
a control module for controlling the charging module to supply current to the bus based on control signals provided to the control terminal of the high-side switch module and the control terminal of the low-side switch module, wherein
The plurality of levels includes a first level, a second level greater than the first level, and a third level greater than the second level, an
The control module is further used for providing a charging instruction signal to the charging module to control the charging module to provide current to the bus when the level provided by the bus device to the bus is detected to change from the first level to the second level according to the control signal.
2. The bus apparatus of claim 1, wherein
The control module is further used for stopping providing the charging instruction signal to the charging module to control the charging module to stop providing the current to the bus when the level provided by the bus device to the bus is detected not to change from the first level to the second level according to the control signal.
3. A bus arrangement according to any of claims 1-2, wherein
The high-order switch module at least comprises a first controllable switch device and a second resistor, wherein the control end, the input end and the output end of the first controllable switch device are respectively connected with the control end, the input end and the output end of the high-order switch module, the two ends of the second resistor are respectively connected with the input end and the output end of the high-order switch module, and
the low-order switch module includes second controllable switch device and third resistance, wherein, the both ends of third resistance are connected respectively the input of high-order switch module with the input of second controllable switch device, and, the control end and the output of second controllable switch device are connected respectively the control end and the output of low-order switch module.
4. A bus arrangement as claimed in claim 3, wherein
The resistance value of the first resistor is larger than that of the third resistor.
5. The bus apparatus of any of claims 1-2,
the charging module comprising a power supply module and a third controllable switching device, wherein the power supply module is connected to the first point via the third controllable switching device,
the control terminal of the third controllable switching device is connected to the control module, and when receiving the charging instruction signal from the control module, the third controllable switching device is in a conducting state so that the power supply module supplies current to the bus via the first point.
6. The bus apparatus of claim 3,
the resistance value of the third resistor is less than 100 ohms.
7. The bus apparatus of claim 3,
the control module determines that the level provided by the bus apparatus to the bus changes from the first level to the second level when detecting the control signal reveals that the first controllable switching device is in an off state and the second controllable switching device changes from an on state to an off state.
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| CN201510214238.9A CN106201955B (en) | 2015-04-29 | 2015-04-29 | Bus device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510214238.9A CN106201955B (en) | 2015-04-29 | 2015-04-29 | Bus device |
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| CN106201955A CN106201955A (en) | 2016-12-07 |
| CN106201955B true CN106201955B (en) | 2021-05-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4992678A (en) * | 1988-12-15 | 1991-02-12 | Ncr Corporation | High speed computer data transfer system |
| CN1227933A (en) * | 1998-03-02 | 1999-09-08 | 富士通株式会社 | Serial bus speed-up circuit |
| US6392446B1 (en) * | 2001-06-01 | 2002-05-21 | Hewlett-Packard Company | Device and method for reducing a time constant of a data bus during a voltage transition |
| CN101169768A (en) * | 2007-11-21 | 2008-04-30 | 中兴通讯股份有限公司 | Method and its device for sharing bus signal output |
-
2015
- 2015-04-29 CN CN201510214238.9A patent/CN106201955B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4992678A (en) * | 1988-12-15 | 1991-02-12 | Ncr Corporation | High speed computer data transfer system |
| CN1227933A (en) * | 1998-03-02 | 1999-09-08 | 富士通株式会社 | Serial bus speed-up circuit |
| US6392446B1 (en) * | 2001-06-01 | 2002-05-21 | Hewlett-Packard Company | Device and method for reducing a time constant of a data bus during a voltage transition |
| CN101169768A (en) * | 2007-11-21 | 2008-04-30 | 中兴通讯股份有限公司 | Method and its device for sharing bus signal output |
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| CN106201955A (en) | 2016-12-07 |
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