CN115291556A - Automatic lockout circuit and method for communication chip faults - Google Patents
Automatic lockout circuit and method for communication chip faults Download PDFInfo
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Abstract
The invention discloses an automatic blocking circuit and method for communication chip faults, and relates to the technical field of power electronics. The method comprises the following steps: the device comprises a signal receiving unit, a signal sending unit and a control unit; the signal receiving unit is used for receiving a signal transmitted by the main station; the signal sending unit comprises a single chip microcomputer and a communication chip, the communication chip is used for converting signals into signals received by the single chip microcomputer, the control unit judges whether the communication chip is abnormal or not by detecting whether the communication chip sends the signals or not in real time and comparing the signals with a result of detecting whether the single chip microcomputer sends the signals or not, and if the signals are abnormal, the control unit locks the circuit. Aiming at the problem that one communication chip is in uncontrolled abnormality on a certain bus, the invention designs a corresponding blocking circuit to isolate the chip, thereby ensuring the normal work of the whole bus.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an automatic locking circuit and method for communication chip faults.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the fire emergency lighting and evacuation indication system industry mostly uses a system (hereinafter referred to as a two-bus system) with a two-bus mode for power supply and communication multiplexing, and compared with a four-wire system in the past (two wires are respectively used for power supply and communication), the two buses have the outstanding advantages of low cost and simple and convenient construction. The chips of the two buses are special chips produced by chip manufacturers or chips with similar functions manufactured by system manufacturers. Due to the outstanding advantage of two buses, the use of such chips is gradually expanding into more fields, such as LED lighting systems, pump valve control systems, fire fighting equipment monitoring systems, etc.
In the two-bus system, the command issued by the master station is a high-low level signal, and the slave station judges the high-low level transmitted by the master station through the resistance voltage division detection signal and analyzes the high-low level. When the slave station sends information, the master station works in a constant current source mode, the slave station opens a control device (generally a triode) to form a constant current circuit path with the master station, then the information is returned through the switch control, and the master station converts current signals into high and low levels and analyzes the high and low levels.
In a fire evacuation system, the number of lamps (slave stations) is large. If a certain lamp fails, especially if a communication chip fails, the communication chip is abnormal, the switching device is continuously controlled to send signals, the communication bus is occupied, and the system cannot work normally. In order to ensure the normal operation of the communication line, it is necessary to detect a fault of the communication chip during the operation of the device and process the fault when the fault is found.
However, the inventor finds that in the prior art, for fault detection of power electronic devices, only one or gate is added on the basis of conventional driving and fault signal input is added, and when a fault signal exists, the driving signal is turned off. The method has the disadvantages that only some predictable abnormalities of the power electronic device, such as protection when the device is over-current caused by output short circuit, are protected, and unpredictable abnormal signals, such as uncontrolled signals, cannot close the driving model and also cause the phenomenon that the communication bus is occupied, so that the conventional fault detection method of the power electronic device cannot solve the problems that the communication bus is occupied due to abnormal communication chips in the fire evacuation system and the system cannot work normally.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an automatic blocking circuit and method for communication chip faults, wherein when one communication chip is in uncontrolled abnormality on a certain bus, the chip is isolated through a transceiving function and an auxiliary circuit of the communication chip, and the normal work of the whole bus is ensured.
In order to realize the purpose, the invention is realized by the following technical scheme:
the first aspect of the present disclosure provides an automatic lockout circuit for a fault of a communication chip, including: the device comprises a signal receiving unit, a signal sending unit and a control unit; the signal receiving unit is used for receiving a signal transmitted by the master station; the signal sending unit comprises a single chip microcomputer and a communication chip, the communication chip is used for converting signals into signals received by the single chip microcomputer, the control unit judges whether the communication chip is abnormal or not by detecting whether the communication chip sends the signals or not in real time and comparing the signals with a result of detecting whether the single chip microcomputer sends the signals or not, and if the signals are abnormal, the control unit carries out circuit blocking processing.
Furthermore, the signal receiving unit comprises a resistor R1 and a resistor R2 which are connected in series, the other end of the resistor R1 is connected with the communication line 1, the other end of the resistor R2 is connected with the communication line 2, and one ends of the resistor R1 and the resistor R2 are connected with the communication chip.
Further, the signal sending unit further comprises a resistor R3, a triode Q1 and a resistor R4, one end of the resistor R3 is connected with the communication chip, the other end of the resistor R3 is connected with the base of the triode Q1, the collector of the triode Q1 is connected with the communication line 1, the emitter of the triode Q1 is connected with the resistor R4, and the other end of the resistor R4 is connected with the communication line 2.
Furthermore, the resistor R3, the triode Q1 and the resistor R4 form a slave station signal sending circuit which is matched with the master station circuit to form a constant current source circuit.
Further, the control unit comprises a diode D1, a resistor R5, a resistor R6, a resistor R7 and a triode Q2; the resistor R5 is connected with the resistor R6 in series, the other end of the resistor R5 is connected with the communication chip, the other end of the resistor R6 is connected with the communication line 2, the anode of the diode is connected with the base of the triode Q1, the cathode of the diode is connected with the collector of the triode Q2, the emitter of the triode Q2 is connected with the communication line 2, the base of the triode Q2 is connected with one end of the resistor R7, and the other end of the resistor R7 is connected with the single chip microcomputer.
Furthermore, the resistor R5 and the resistor R6 are used for detecting the output of the communication chip, and the diode and the triode Q2 are used for controlling the output of the communication chip.
The second aspect of the present disclosure provides an automatic lockout method for communication chip faults, including the following steps:
detecting whether the communication chip sends a signal or not;
comparing the detection result with a result of detecting whether the single chip microcomputer sends a signal or not, and judging whether the communication chip is abnormal or not;
if the abnormal state exists, the locking circuit is processed.
Furthermore, the specific steps of comparing the detection result with the result of whether the single chip microcomputer sends a signal and judging whether the communication chip is abnormal are as follows: when the singlechip does not send signals, the communication chip is detected to send signals, and an abnormal result is output;
if the signals need to be sent, the P07 of the single chip microcomputer outputs low level, the output of the communication chip is opened, meanwhile, the sending signals of the communication chip are detected and compared with the signals sent by the single chip microcomputer, if the signals are inconsistent, the fact that the communication chip of the chip is damaged is proved, and an abnormal result is output.
Further, the specific steps of the blocking circuit processing are as follows: after an abnormal result is input, the P07 of the singlechip is controlled to output high level, the output of the communication chip is blocked, and a fault signal is given out.
Furthermore, the specific method for blocking the output of the communication chip is that the output of the communication chip is clamped through the triode Q2 and the diode D1, so that no signal is sent by mistake on the bus, the bus is released, and other slave stations on the bus can normally return information to the master station.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
the invention discloses an automatic blocking circuit and method for communication chip faults. At the moment, the control chip can clamp the output of the communication chip through the newly added triode Q2 and the diode, so that no signal which is sent by mistake exists on the bus, the bus is released, and other slave stations on the bus can normally return information to the master station. Aiming at the problem that one communication chip is in uncontrolled abnormality on a certain bus, the invention designs a corresponding blocking circuit to isolate the chip, thereby ensuring the normal work of the whole bus.
Aiming at the two-wire system communication which is commonly used at present, the invention transmits and receives the communication chip through the chip and the auxiliary circuit, thereby being free from the restriction of a protocol. The invention judges the comparison between the output signal and the signal sent by the singlechip through the pair of resistors, and if the output signal is inconsistent with the signal sent by the singlechip, the chip can be closed by directly blocking the chip output pin without considering whether the communication chip is controlled, and the output of the chip can be closed, thereby ensuring that the bus is not occupied.
The invention takes an evacuation system as an intervention point, no matter two buses or four buses, as long as the communication has the condition that the slave station is controlled by a certain singlechip and peripheral auxiliary controllable devices exist when the slave station sends signals, the problem that the slave station fails to occupy the buses can be solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
Fig. 1 is a conventional communication circuit diagram of a fire evacuation system;
FIG. 2 is a circuit diagram of an automatic lockout circuit for communication chip failure according to an embodiment;
fig. 3 is a flowchart of an automatic lockout method for communication chip failure according to this embodiment.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
the lamps are part of the evacuation system, the monitoring host is arranged on the lamps, and all the lamps are connected with the host through a communication bus.
From the communication perspective, the communication chip configured in the monitoring host is the master station, and the communication chip configured in the lamp is the slave station. As shown in fig. 1, in the conventional circuit, the device is composed of a single chip microcomputer U1, an externally-purchased communication chip U2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a triode Q1. The communication chip U2 is used for converting communication signals of a certain protocol into signals which can be accepted by the single chip microcomputer. R1 and R2 are used for detecting a voltage signal transmitted by a main station in the communication line. The resistor R3, the triode Q1 and the resistor R4 are signal sending circuits of the slave station and are matched with the master station circuit to form a constant current source circuit. A current/voltage conversion circuit in the main station can detect the current signal and convert the current signal into a corresponding communication signal for identification.
In the actual use process, if the communication chip U2 fails, an irregular transmission signal is generated, and the bus is occupied, so that the whole system cannot work. The prior art can only solve the abnormal signals which can be predicted by the communication chip, but when the communication chip is in uncontrolled abnormality, the fault removal can not be realized. Aiming at the defects of the prior art, the invention provides an automatic lockout circuit and a method for communication chip faults, which can solve the problem of fault detection and elimination when one communication chip is in uncontrolled abnormality on a certain bus, and specifically comprises the following steps:
the first embodiment is as follows:
the first embodiment of the present disclosure provides an automatic lockout circuit for a communication chip fault, including: the device comprises a signal receiving unit, a signal sending unit and a control unit; the signal receiving unit is used for receiving a signal transmitted by the master station; the signal sending unit comprises a resistor R3, a triode Q1, a resistor R4, a single chip microcomputer and a communication chip, wherein a URX interface (receiving end) of the communication chip is connected with a TX interface (sending end) of the single chip microcomputer, a UTX interface (sending end) of the communication chip is connected with an RX interface (receiving end) of the single chip microcomputer and used for converting signals into signals received by the single chip microcomputer, the control unit judges whether the communication chip is abnormal or not by detecting whether the communication chip sends the signals or not in real time and comparing the signals with a result of detecting whether the single chip microcomputer sends the signals or not, and if the communication chip is abnormal, blocking circuit processing is carried out.
As a further technical scheme, the signal receiving unit includes a resistor R1 and a resistor R2 connected in series, the other end of the resistor R1 is connected to the communication line 1, the other end of the resistor R2 is connected to the communication line 2, and one end of the resistor R1 and one end of the resistor R2 are both connected to the communication chip, specifically, connected to a PI interface (chip-defined receiving port) of the communication chip.
And a resistor R3, a triode Q1 and a resistor R4 in the signal transmitting unit form a slave station signal transmitting circuit, and the slave station signal transmitting circuit is matched with the master station circuit to form a constant current source circuit. Wherein, resistance R3 one end links to each other with the communication chip, and is specific, is connected to the PO interface (the self-defined mouth that sends of chip) of communication chip, and the other end links to each other with triode Q1 base, and communication line 1 is connected to triode Q1's collecting electrode, and R4 is connected to the projecting pole, and communication line 2 is connected to resistance R4's the other end.
The control unit comprises a diode D1, a resistor R5, a resistor R6, a resistor R7 and a triode Q2; the resistor R5 and the resistor R6 are used for detecting the output of the communication chip, and the diode and the triode Q2 are used for controlling the output of the communication chip. The resistor R5 is connected with the resistor R6 in series, the other end of the resistor R5 is connected with a PO interface of the communication chip, the other end of the resistor R6 is connected with the communication line 2, the anode of the diode is connected with the base of the triode Q1, the cathode of the diode is connected with the collector of the triode Q2, the emitter of the triode Q2 is connected with the communication line 2, the base of the triode Q2 is connected with one end of the resistor R7, and the other end of the resistor R7 is connected with the P07 interface of the single chip microcomputer, wherein the specific connection mode is as shown in figure 2.
According to the invention, based on the actual situation that a communication chip of a fire-fighting evacuation system is purchased outside and cannot be processed inside, a communication chip fault detection and blocking circuit is designed, as shown in fig. 2, two resistors R5 and R6 are added in a conventional circuit for detecting the output of a communication chip U2, and a Schottky diode D1 and a triode Q2 are added for controlling the output of the U2. The technical problem that the fire-fighting evacuation system cannot be subjected to troubleshooting when uncontrolled abnormity occurs is solved. The specific working principle is as follows:
the control chip firstly knows whether the control chip sends a command or not, if the singlechip U1 does not send a signal, the P07 of the singlechip U1 outputs high level and blocks the output of the communication chip U2 when detecting that the communication chip U2 sends the signal. The availability of the bus is guaranteed.
When the signal of the single chip microcomputer U1 is sent, the P07 of the single chip microcomputer U1 outputs a low level, the output of the communication chip U2 is opened, meanwhile, the sending signal of the communication chip U2 is detected through a circuit formed by the resistor R5 and the resistor R6 and is compared with the signal sent by the single chip microcomputer U1, if the sending signal is inconsistent, the communication chip U2 is proved to be damaged, the P07 of the single chip microcomputer U1 can be controlled to output a high level, the output of the U2 is blocked, and the sending of an error signal can be avoided if a fault signal is given.
It should be noted that the lockout circuit of the present invention can also be used in the design of communication chips for self-diagnosis and self-isolation. The detection and control circuit principle is consistent, and the circuit performing the detection and control may be other control circuits (e.g., analog circuits).
Example two:
the second embodiment of the disclosure provides an automatic blocking method for a communication chip fault, as shown in fig. 3, when a communication chip sending signal is detected, an abnormal signal is judged, whether a sending instruction exists is detected, if not, P07 outputs a high level, an output circuit of a communication chip U2 is blocked, if so, P07 outputs a low level, an output circuit of the communication chip U2 is opened, a single chip U1 sends a signal and is compared with the output signal of the communication chip U2, if the signal is the same, P07 continues to output the low level, otherwise, the high level is output to block the output circuit of the communication chip U2 until the signal sending of the single chip U1 is finished. The method specifically comprises the following steps:
detecting whether the communication chip sends a signal or not; and comparing the detection result with a result of detecting whether the single chip microcomputer sends a signal or not, and judging whether the communication chip is abnormal or not.
Specifically, when the single chip microcomputer does not send a signal, if the communication chip is detected to send the signal, an abnormal result is output; if the signals need to be sent, the P07 of the single chip microcomputer outputs low level, the output of the communication chip is opened, meanwhile, the sending signals of the communication chip are detected and compared with the signals sent by the single chip microcomputer, if the signals are inconsistent, the fact that the communication chip of the chip is damaged is proved, and an abnormal result is output.
If the abnormal condition exists, the blocking circuit is processed. The method comprises the following specific steps: after an abnormal result is input, the P07 of the single chip microcomputer is controlled to output a high level, the output of the communication chip is blocked, and a fault signal is given out.
As a further technical scheme, a specific method for blocking the output of the communication chip is to clamp the output of the communication chip through a triode Q2 and a diode D1, so that there is no signal sent by mistake on the bus, the bus is released, and other slave stations on the bus can normally return information to the master station.
Because the control chip can control the transceiving of the communication chip, the communication chip detects the high-low level signal of the bus and then converts the high-low level signal into a signal required by the control chip during transceiving. When the information is sent, the control chip sends the information to be sent to the communication chip. The communication chip is matched with the master station through the control triode Q1 to finish information feedback of the current loop.
If the communication chip is abnormal, the communication chip may send the information when the control chip does not send the information, so that the bus is occupied.
Therefore, the invention designs a blocking method of an automatic blocking circuit for communication chip faults, a control chip can detect whether a communication chip sends a signal or not in real time through an added resistor R5 and an added resistor R6, and if the control chip does not send information and detects the information through the resistor R5 and the resistor R6, the communication chip is proved to be abnormal and occupies a bus. At the moment, the control chip can clamp the output of the communication chip through the newly added triode Q2 and the diode D1, namely, the isolation of the fault communication chip is realized, so that no signal which is sent by mistake is generated on the bus, the bus is released, and other slave stations on the bus can normally return information to the master station.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An automatic lockout circuit for a communication chip failure, comprising: the device comprises a signal receiving unit, a signal sending unit and a control unit; the signal receiving unit is used for receiving a signal transmitted by the main station; the signal sending unit comprises a single chip microcomputer and a communication chip, the communication chip is used for converting signals into signals received by the single chip microcomputer, the control unit judges whether the communication chip is abnormal or not by detecting whether the communication chip sends the signals or not in real time and comparing the signals with a result of detecting whether the single chip microcomputer sends the signals or not, and if the signals are abnormal, the control unit carries out circuit blocking processing.
2. The automatic lockout circuit for a fault of a communication chip as claimed in claim 1, wherein the signal receiving unit comprises a resistor R1 and a resistor R2 connected in series, the other end of the resistor R1 is connected to the communication line 1, the other end of the resistor R2 is connected to the communication line 2, and one end of each of the resistor R1 and the resistor R2 is connected to the communication chip.
3. The automatic blocking circuit for the communication chip fault according to claim 1, wherein the signal transmitting unit further comprises a resistor R3, a transistor Q1 and a resistor R4, one end of the resistor R3 is connected to the communication chip, the other end is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the communication line 1, the emitter is connected to the resistor R4, and the other end of the resistor R4 is connected to the communication line 2.
4. The automatic lockout circuit for communication chip faults as claimed in claim 3, wherein the resistor R3, the transistor Q1 and the resistor R4 constitute a slave station signal transmitting circuit, and cooperate with the master station circuit to form a constant current source circuit.
5. The automatic lockout circuit for communication chip malfunction of claim 1 wherein the control unit comprises a diode D1, a resistor R5, a resistor R6, a resistor R7, and a transistor Q2; the resistor R5 is connected with the resistor R6 in series, the other end of the resistor R5 is connected with the communication chip, the other end of the resistor R6 is connected with the communication line 2, the anode of the diode is connected with the base of the triode Q1, the cathode of the diode is connected with the collector of the triode Q2, the emitter of the triode Q2 is connected with the communication line 2, the base of the triode Q2 is connected with one end of the resistor R7, and the other end of the resistor R7 is connected with the single chip microcomputer.
6. The automatic lockout circuit for communication chip failures as claimed in claim 5, wherein a resistor R5, a resistor R6 are used to detect the output of the communication chip, and a diode and a transistor Q2 are used to control the output of the communication chip.
7. An automatic blocking method for communication chip faults is characterized by comprising the following steps:
detecting whether the communication chip sends a signal or not;
comparing the detection result with a result of detecting whether the single chip microcomputer sends a signal or not, and judging whether the communication chip is abnormal or not;
if the abnormal state exists, the locking circuit is processed.
8. The method for automatically blocking the fault of the communication chip as claimed in claim 7, wherein the specific steps of comparing the detection result with the result of detecting whether the single chip microcomputer sends out the signal and judging whether the communication chip is abnormal or not are as follows: when the single chip microcomputer does not send signals, if the communication chip is detected to send signals, an abnormal result is output;
if the signals need to be sent, the P07 of the single chip microcomputer outputs low level, the output of the communication chip is opened, meanwhile, the sending signals of the communication chip are detected and compared with the signals sent by the single chip microcomputer, if the signals are inconsistent, the fact that the communication chip of the chip is damaged is proved, and an abnormal result is output.
9. The method as claimed in claim 7, wherein the step of performing the lockout circuit process comprises the steps of: after an abnormal result is input, the P07 of the singlechip is controlled to output high level, the output of the communication chip is blocked, and a fault signal is given out.
10. The method as claimed in claim 9, wherein the output of the communication chip is blocked by clamping the output of the communication chip through the transistor Q2 and the diode D1, so that there is no error signal on the bus, the bus is released, and other slave stations on the bus can normally return information to the master station.
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