CN116840740B - Control loop detection circuit and method and electronic equipment - Google Patents
Control loop detection circuit and method and electronic equipment Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
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Abstract
The application discloses a control loop detection circuit and method and electronic equipment, and relates to the technical field of control loop detection. The control loop detection circuit comprises a constant current source module, a first diode, a switch body control loop, a broken wire detection module and a processing module; the input end of the constant current source module is connected with the positive electrode of the power supply, and the output end of the constant current source module is electrically connected with the anode of the first diode; the switch body control loop comprises a closing coil and an anti-tripping relay which are connected in parallel, the input end of the switch body control loop is electrically connected with the cathode of the first diode, and the output end of the switch body control loop is connected with the negative electrode of the power supply; the input end of the broken wire detection module is electrically connected with the output end of the constant current source module, and the output end of the broken wire detection module is grounded; the broken line detection module comprises a photoelectric coupler; the processing module is electrically connected with the broken wire detection module. According to the control loop detection circuit provided by the embodiment of the application, whether the closing loop is broken or not can be accurately detected.
Description
Technical Field
The present application relates to the field of control loop detection technologies, and in particular, to a control loop detection circuit, a control loop detection method, and an electronic device.
Background
Control loop detection refers to: and detecting whether the electrical loop is broken or not when the switch is opened or closed, wherein the switch has no opening or closing condition. The traditional control loop detection method utilizes a small current to enable the current to return to the public end of the operation power supply after passing through the opening and closing coil of the switch body; whether the wire is broken is determined by detecting whether this current can form a loop, as shown in fig. 1.
Along with the development perfection of the power equipment, in order to avoid the reason that the switching-on output end always has switching-on voltage due to the reason that the switching-on loop is manually switched on or the remotely switched on contact is stuck and the like, when the switch trips due to the protection action, the switch can be switched on again, the protection action is re-tripped, and then the switch is re-tripped, so that the switch jump without stopping is formed, and the anti-tripping function is introduced. A typical anti-jump loop is shown in fig. 2, and an anti-jump relay K7 is introduced, and after a switch is closed, a normally closed contact K71 of the K7 is opened, so that the phase change is avoided from being stuck to a contact of the closing loop, and the purpose of preventing jump is achieved. However, due to the intervention of the relay K7, the conventional control loop detection method is no longer applicable, because when the closing loop breaks, the detection current can also form a loop through the switch position DL2 and the relay K7, and the MCU cannot detect whether the control loop has broken.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a control loop detection circuit, a control loop detection method and electronic equipment, which can accurately detect whether a closing loop is broken or not under the condition of introducing an anti-tripping relay.
In one aspect, a control loop detection circuit according to an embodiment of the present application includes:
the input end of the constant current source module is connected with the positive electrode of the power supply, and the constant current source module is used for providing detection current;
the anode of the first diode is electrically connected with the output end of the constant current source module;
the switch body control loop comprises a closing coil and an anti-tripping relay which are connected in parallel, the input end of the switch body control loop is electrically connected with the cathode of the first diode, and the output end of the switch body control loop is connected with the negative electrode of the power supply;
the input end of the broken wire detection module is electrically connected with the output end of the constant current source module, and the output end of the broken wire detection module is grounded; the broken line detection module comprises a photoelectric coupler;
the processing module is electrically connected with the broken wire detection module;
the voltage of the photoelectric coupler is equal to the sum of the voltage drop of the first diode and the voltage drop of the switch body control loop; when the closing loop where the closing coil is located is not broken, the voltage of the photoelectric coupler is smaller than the conducting voltage of the photoelectric coupler; when a closing loop where the closing coil is broken, the voltage of the photoelectric coupler is larger than the conducting voltage of the photoelectric coupler, the photoelectric coupler is conducted, and the processing module detects a closing loop breaking signal.
According to some embodiments of the application, the constant current source module comprises:
the collector of the first triode is connected with the positive electrode of the power supply through a plurality of first resistors connected in series;
the emitter of the second triode is electrically connected with the base electrode of the first triode, and the collector of the second triode is electrically connected with the emitter of the first triode;
one end of the second resistor is electrically connected with the emitter of the second triode, and the other end of the second resistor is electrically connected with the base of the second triode;
one end of the third resistor is electrically connected with the collector electrode of the second triode, and the other end of the third resistor is electrically connected with the anode electrode of the first diode;
the anode of the zener diode is electrically connected with the other end of the third resistor, and the cathode of the zener diode is electrically connected with the base electrode of the second triode;
and one end of the fourth resistor is electrically connected with the collector electrode of the first triode, and the other end of the fourth resistor is electrically connected with one end of the second resistor.
According to some embodiments of the application, the first transistor is an NPN transistor and the second transistor is a PNP transistor.
According to some embodiments of the application, the disconnection detection module comprises:
the photoelectric coupler is characterized in that the collector electrode of a phototriode of the photoelectric coupler is electrically connected with the processing module, the collector electrode of the phototriode is also connected with working voltage through a fifth resistor, and the emitter electrode of the phototriode is grounded;
a capacitor connected in parallel with the light emitting diode of the photoelectric coupler;
a second diode connected in parallel with the capacitor;
and one end of the sixth resistor is electrically connected with the output end of the constant current source module and the anode of the first diode respectively, the other end of the sixth resistor is electrically connected with the anode of the light emitting diode, and the cathode of the light emitting diode is connected with the negative electrode of the power supply.
On the other hand, according to the control loop detection method of the embodiment of the present application, based on the control loop detection circuit described above, the control loop detection method includes the following steps:
providing a detection current through a constant current source module;
when the switching-on loop where the switching-on coil is located is broken, the detection current flows to the negative electrode of the power supply through the loop where the anti-tripping relay is located after passing through the first diode;
at this time, the voltage of the photoelectric coupler of the broken line detection module is larger than the conducting voltage of the photoelectric coupler, the photoelectric coupler is conducted, and the processing module detects a broken line signal of the closing loop.
According to some embodiments of the application, the control loop detection method further comprises the steps of:
when the switching-on loop where the switching-on coil is located is not broken, the detection current flows to the negative electrode of the power supply through the switching-on coil and the anti-tripping relay which are connected in parallel in the control loop of the switch body after passing through the first diode;
at this time, the voltage of the photoelectric coupler is smaller than the conducting voltage of the photoelectric coupler, the photoelectric coupler is not conducted, and the processing module cannot detect the closing loop disconnection signal.
According to some embodiments of the application, the constant current source module comprises:
the collector of the first triode is connected with the positive electrode of the power supply through a plurality of first resistors connected in series;
the emitter of the second triode is electrically connected with the base electrode of the first triode, and the collector of the second triode is electrically connected with the emitter of the first triode;
one end of the second resistor is electrically connected with the emitter of the second triode, and the other end of the second resistor is electrically connected with the base of the second triode;
one end of the third resistor is electrically connected with the collector electrode of the second triode, and the other end of the third resistor is electrically connected with the anode electrode of the first diode;
the anode of the zener diode is electrically connected with the other end of the third resistor, and the cathode of the zener diode is electrically connected with the base electrode of the second triode;
and one end of the fourth resistor is electrically connected with the collector electrode of the first triode, and the other end of the fourth resistor is electrically connected with one end of the second resistor.
According to some embodiments of the application, the step of providing the detection current through the constant current source module specifically includes:
setting the resistance value of the third resistor according to the required detection current;
the positive electrode of the power supply provides input voltage, and the detection current is obtained after the input voltage passes through the constant current source module;
and setting the resistance value of the second resistor to enable the bias current of the zener diode to be kept constant, so that the detection current is kept constant.
According to some embodiments of the application, the step of providing the detection current by the constant current source module further comprises:
and filtering interference signals existing in the input voltage through the first resistor.
On the other hand, the electronic device according to the embodiment of the present application includes the control loop detection circuit described in the embodiment of the above aspect.
The control loop detection circuit, the control loop detection method and the electronic equipment have at least the following beneficial effects: by introducing a broken line detection module, the broken line detection module internally comprises a photoelectric coupler, and the voltage of the photoelectric coupler is equal to the sum of the voltage drop of the first diode and the voltage drop of the switch body control loop; when the switching-on loop is not broken, the detection current provided by the constant current source module passes through the first diode and the switch body control loop, and the switching-on coil and the anti-tripping relay are connected in parallel, so that the parallel resistance is smaller, the voltage drop of the switch body control loop is smaller, the voltage of the photoelectric coupler is smaller than the conduction voltage of the photoelectric coupler, and the photoelectric coupler is not conducted; when the switching-on loop is broken, the detection current provided by the constant current source module passes through the loop where the first diode and the anti-tripping relay are located, the resistance of the anti-tripping relay is larger than that of the parallel connection of the switching-on coil and the anti-tripping relay, the voltage drop of the control loop of the switch body is larger, the voltage of the photoelectric coupler is larger than the conducting voltage of the photoelectric coupler, the photoelectric coupler is conducted, and the processing module detects the switching-on loop broken signal. According to the control loop detection circuit provided by the embodiment of the application, the anti-tripping relay is introduced, and meanwhile, whether the closing loop is broken or not can be accurately detected.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic circuit diagram of a control loop detection circuit in the related art;
FIG. 2 is a schematic circuit diagram of a control loop after introduction of an anti-bounce relay;
FIG. 3 is a schematic circuit diagram of a control loop detection circuit according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating steps of a control loop detection method according to an embodiment of the present application;
FIG. 5 is a flowchart illustrating a control loop detection method according to another embodiment of the present application;
reference numerals:
the device comprises a constant current source module 100, a switch body control loop 200, a broken wire detection module 300 and a processing module 400.
Detailed Description
Reference will now be made in detail to the present embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present application, but not to limit the scope of the present application. Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application. The step numbers in the following embodiments are set for convenience of illustration only, and the order between the steps is not limited in any way, and the execution order of the steps in the embodiments may be adaptively adjusted according to the understanding of those skilled in the art.
In the description of the present application, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," "third," and "fourth" and the like in the description and in the claims and drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Control loop detection refers to: and detecting whether the electrical loop is broken or not when the switch is opened or closed, wherein the switch has no opening or closing condition. The traditional control loop detection method utilizes a small current to enable the current to return to the public end of the operation power supply after passing through the opening and closing coil of the switch body; whether the wire is broken is determined by detecting whether this current can form a loop, as shown in fig. 1.
Along with the development perfection of the power equipment, in order to avoid the reason that the switching-on output end always has switching-on voltage due to the reason that the switching-on loop is manually switched on or the remotely switched on contact is stuck and the like, when the switch trips due to the protection action, the switch can be switched on again, the protection action is re-tripped, and then the switch is re-tripped, so that the switch jump without stopping is formed, and the anti-tripping function is introduced. A typical anti-jump loop is shown in fig. 2, and an anti-jump relay K7 is introduced, and after a switch is closed, a normally closed contact K71 of the K7 is opened, so that the phase change is avoided from being stuck to a contact of the closing loop, and the purpose of preventing jump is achieved. However, due to the intervention of the relay K7, the conventional control loop detection method is no longer applicable, because when the closing loop breaks, the detection current can also form a loop through the switch position DL2 and the relay K7, and the MCU cannot detect whether the control loop has broken.
Therefore, the embodiment of the application provides a control loop detection circuit, a control loop detection method and electronic equipment, wherein a broken line detection module is introduced, the broken line detection module internally comprises a photoelectric coupler, and the voltage of the photoelectric coupler is equal to the sum of the voltage drop of a first diode and the voltage drop of a switch body control loop; when the switching-on loop is not broken, the detection current provided by the constant current source module passes through the first diode and the switch body control loop, and the switching-on coil and the anti-tripping relay are connected in parallel, so that the parallel resistance is smaller, the voltage drop of the switch body control loop is smaller, the voltage of the photoelectric coupler is smaller than the conduction voltage of the photoelectric coupler, and the photoelectric coupler is not conducted; when the switching-on loop is broken, the detection current provided by the constant current source module passes through the loop where the first diode and the anti-tripping relay are located, the resistance of the anti-tripping relay is larger than that of the parallel connection of the switching-on coil and the anti-tripping relay, the voltage drop of the control loop of the switch body is larger, the voltage of the photoelectric coupler is larger than the conducting voltage of the photoelectric coupler, the photoelectric coupler is conducted, and the processing module detects the switching-on loop broken signal. According to the control loop detection circuit provided by the embodiment of the application, the anti-tripping relay is introduced, and meanwhile, whether the closing loop is broken or not can be accurately detected.
The following describes in detail a control loop detection circuit, a control loop detection method, and an electronic device according to an embodiment of the present application with reference to fig. 3 to 5.
As shown in fig. 3, a control loop detection circuit according to an embodiment of the present application includes: the device comprises a constant current source module 100, a first diode D2, a switch body control loop 200, a broken wire detection module 300 and a processing module 400; the input end of the constant current source module 100 is connected with the positive electrode of the power supply, the output end of the constant current source module 100 is electrically connected with the anode of the first diode D2, and the constant current source module 100 is used for providing detection current; the switch body control loop 200 comprises a closing coil and an anti-tripping relay K1 which are mutually connected in parallel, the input end of the switch body control loop 200 is electrically connected with the cathode of the first diode D2, and the output end of the switch body control loop 200 is connected with the negative electrode of the power supply; the input end of the broken wire detection module 300 is electrically connected with the output end of the constant current source module 100, and the output end of the broken wire detection module 300 is grounded; the disconnection detecting module 300 includes a photo coupler U1; the processing module 400 is electrically connected with the broken wire detection module 300; wherein, the voltage of the photo coupler U1 is equal to the sum of the voltage drop of the first diode D2 and the voltage drop of the switch body control loop 200; when the switching-on loop where the switching-on coil is located is not broken, the voltage of the photoelectric coupler U1 is smaller than the conducting voltage of the photoelectric coupler U1; when the closing loop where the closing coil is located is broken, the voltage of the photoelectric coupler U1 is greater than the conducting voltage of the photoelectric coupler U1, the photoelectric coupler U1 is conducted, and the processing module 400 detects a closing loop broken signal.
In practical application, the internal resistance of the closing coil is usually several ohms to tens of ohms, and the internal resistance is small; the internal resistance of the anti-tripping relay K1 is hundreds of ohms to thousands of ohms, the internal resistance is larger, and the resistance characteristics of the two can be used for distinguishing whether the detection current flows through a loop formed by connecting the closing coil and the anti-tripping relay K1 in parallel or through the loop of the anti-tripping relay K1. When the switching-on loop is not disconnected, the detection current provided by the constant current source module 100 passes through the first diode D2 and the switch body control loop 200, and the switching-on coil and the anti-tripping relay K1 are connected in parallel, so that the parallel resistance is small, the voltage drop of the switch body control loop 200 is small, the voltage of the photoelectric coupler U1 is smaller than the conduction voltage of the photoelectric coupler U1, and the photoelectric coupler U1 is not conducted; when the switching-on loop is broken, the detection current provided by the constant current source module 100 passes through the first diode D2 and the loop where the anti-tripping relay K1 is located, the resistance of the anti-tripping relay K1 is larger than that when the switching-on coil and the anti-tripping relay K1 are connected in parallel, the voltage drop of the switch body control loop 200 is larger, the voltage of the photoelectric coupler U1 is larger than the conducting voltage of the photoelectric coupler U1, the photoelectric coupler U1 is conducted, and the processing module 400 detects the switching-on loop broken signal. According to the control loop detection circuit provided by the embodiment of the application, the anti-tripping relay is introduced, and meanwhile, whether the closing loop is broken or not can be accurately detected.
Specifically, as shown in fig. 3, in some embodiments of the present application, the constant current source module 100 includes a first triode Q1, a second triode Q2, a second resistor R7, a third resistor R5, a zener diode VD1, and a fourth resistor R6, where a collector of the first triode Q1 is connected to a positive electrode of a power supply through a plurality of first resistors connected in series; in this example, two first resistors connected in series are shown in the figure, and are respectively R3 and R4, and it should be noted that the number of the first resistors may be adjusted according to actual needs; meanwhile, the power supply positive electrode for supplying an input voltage of 24V is shown in the drawing, but the power supply positive electrode may supply input voltages of different levels of 48V, 110V, etc. as needed, not limited thereto. The base electrode of the first triode Q1 is electrically connected with the emitter electrode of the second triode Q2, and the collector electrode of the second triode Q2 is electrically connected with the emitter electrode of the first triode Q1; one end of the second resistor R7 is electrically connected with the emitter of the second triode Q2, and the other end of the second resistor R7 is electrically connected with the base of the second triode Q2; one end of the third resistor R5 is electrically connected with the collector electrode of the second triode Q2, and the other end of the third resistor R5 is electrically connected with the anode electrode of the first diode D2; the anode of the voltage stabilizing diode VD1 is electrically connected with the other end of the third resistor R5, and the cathode of the voltage stabilizing diode VD1 is electrically connected with the base electrode of the second triode Q2; one end of the fourth resistor R6 is electrically connected to the collector of the first transistor Q1, and the other end of the fourth resistor R6 is electrically connected to one end of the second resistor R7. The first transistor Q1 is an NPN transistor, and the second transistor Q2 is a PNP transistor.
The first resistors R3 and R4 may be designed with a large resistance and a large package, and the resistance may be up to several kiloohms, and the first resistors R3 and R4 are used to absorb various disturbances in the EMC of the input voltage, so as to avoid damaging the subsequent circuits. The sum of the emitter junction voltage (Ube 1) of the first triode Q1 and the voltage drop (UR 5) across the third resistor R5 is equal to the sum of the regulated voltage value UZ (5.1V) of the zener diode VD1 and the emitter junction voltage (Ube 2) of the second triode Q2, namely ube1+ur5=uz+ube2, wherein Ube1, ube2 and UZ are all device intrinsic parameters, which are approximately constant voltages when the ambient temperature is unchanged. Therefore, UR5 is also a fixed voltage, and by setting the resistance value of the third resistor R5, a desired detection current can be set. However, the circuit may be used on products with voltage levels of DC24V/DC48V/DC110/DC220V, etc., with different voltage levels differing in the bias current on the zener diode VD1, which may cause the set constant current value to shift. To overcome the above-mentioned difficulty, it is necessary to reduce this bias current by using a PNP transistor, i.e., the second transistor Q2. The emitter junction voltage of the second triode Q2 is Ube2, and the constant bias current i=ube2/R7 set by the second resistor R7 obviously, I is not affected by the change of the input voltage, so that the bias current on the zener diode VD1 is constant.
For input voltages of different grades, such as voltage grades of DC24V/DC48V/DC110/DC220V, the finally generated detection current is maintained at about 1mA, namely the magnitude of the detection current is not influenced by the input voltage grade, and the required constant current is met.
As shown in fig. 3, in some embodiments of the present application, the disconnection detecting module 300 includes a photo coupler U1, a capacitor C1, a second diode D1, and a sixth resistor R2; the collector of the phototriode of the photoelectric coupler U1 is electrically connected with the processing module 400, the collector of the phototriode is also connected with the working voltage of 3.3V through a fifth resistor R1, and the emitter of the phototriode is grounded; the capacitor C1 is connected with the light emitting diode of the photoelectric coupler U1 in parallel, and the second diode D1 is connected with the capacitor C1 in parallel; one end of the sixth resistor R2 is electrically connected to the output end of the constant current source module 100 and the anode of the first diode D2, and the other end of the sixth resistor R2 is electrically connected to the anode of the light emitting diode, and the cathode of the light emitting diode is connected to the negative electrode of the power supply. The first diode D2 is an isolation diode, and serves to isolate the constant current source module 100 from other circuits, thereby preventing interference.
As can be seen from a data manual of the photo-coupler U1, the forward conduction voltage drop of the photo-coupler U1 is 1.1-1.4V (the conduction voltage drop of most photo-couplers is in this range), and the voltage of the photo-coupler U1 is equal to the sum of the voltage drop (0.7V) on the first diode D2 and the voltage drop on the switch body control loop.
Assuming that the internal resistance of the closing coil is ro=100deg.OMEGA (the closing coil of the normal switch is not more than 100deg.OMEGA), the resistance of the anti-trip relay K1 is Rj=400OMEGA (the resistance of the normal anti-trip relay is not less than 400OMEGA); as can be seen from fig. 3, when the closing circuit is not broken, the voltage drop uk=1ma (Ro// Rj) <0.1v generated by the 1mA detection current in the switch body control circuit, the voltage u=uk+ud2 <0.8v of the photo coupler U1, and ud2 is the voltage drop of the first diode D2, and the photo coupler U1 is not turned on. When the closing loop is broken, the voltage drop Uk=1ma×rj >0.4v of the 1mA detection current in the switch body control loop occurs, and at this time, the voltage U=Uk+UD2 of the photoelectric coupler U1 is greater than 1.1V, and the photoelectric coupler U1 is conducted; at this time, the processing module 400 can detect the disconnection signal of the closing circuit, and learn that the closing circuit is disconnected, so as to play a role in protecting the control circuit. The processing module 400 may employ an MCU or other conventional processor.
According to the control loop detection circuit provided by the embodiment of the application, the anti-tripping relay is introduced, and meanwhile, the situation that whether the closing loop is broken or not can be accurately detected, so that the defect that the traditional detection circuit cannot detect whether the closing loop is broken or not under the condition that the anti-tripping relay is introduced is overcome.
On the other hand, based on the control loop detection circuit, the embodiment of the application also provides a control loop detection method, as shown in fig. 4, comprising the following steps:
step S100: providing a sense current through the constant current source module 100;
step S200: when a closing loop where the closing coil is located is broken, after the detection current passes through the first diode D2, the detection current flows to the negative electrode of the power supply through a loop where the anti-tripping relay K1 is located;
step S300: at this time, the voltage of the photo coupler U1 of the disconnection detecting module 300 is greater than the turn-on voltage of the photo coupler U1, the photo coupler U1 is turned on, and the processing module 400 detects the disconnection signal of the closing circuit.
Specifically, in order for the constant current source module 100 to be able to provide the required detection current, the constant current source module 100 adopts a circuit design as shown in fig. 3, and the step S100 specifically includes the following sub-steps:
step S101: setting the resistance value of the third resistor R5 according to the required detection current;
step S102: the positive electrode of the power supply provides input voltage, and the input voltage passes through the constant current source module 100 to obtain detection current;
step S103: by setting the resistance value of the second resistor R7, the bias current of the zener diode VD1 is kept constant, and the detection current is kept constant.
In the constant current source module 100, the first resistors R3 and R4 may have a large resistance and a large package, where the resistance may be up to several kiloohms, and the first resistors R3 and R4 are used to filter various interference signals in the EMC of the input voltage, so as to avoid damaging the subsequent circuits. The sum of the emitter junction voltage (Ube 1) of the first triode Q1 and the voltage drop (UR 5) across the third resistor R5 is equal to the sum of the regulated voltage value UZ (5.1V) of the zener diode VD1 and the emitter junction voltage (Ube 2) of the second triode Q2, namely ube1+ur5=uz+ube2, wherein Ube1, ube2 and UZ are all device intrinsic parameters, which are approximately constant voltages when the ambient temperature is unchanged. Therefore, UR5 is also a fixed voltage, and by setting the resistance value of the third resistor R5, a desired constant detection current can be obtained. However, the circuit may be used on products with voltage levels of DC24V/DC48V/DC110/DC220V, etc., with different voltage levels differing in the bias current on the zener diode VD1, which may cause the set constant current value to shift. To overcome the above-mentioned difficulty, it is necessary to reduce this bias current by using a PNP transistor, i.e., the second transistor Q2. The emitter junction voltage of the second triode Q2 is Ube2, and the constant bias current i=ube2/R7 set by the second resistor R7 obviously, I is not affected by the change of the input voltage, so that the bias current on the zener diode VD1 is constant.
After the constant current source module 100 provides the detection current, the detection current flows into the switch body control loop 200 through the first diode D2, when the closing loop is disconnected, the detection current flows to the power supply cathode through the anti-jump relay K1, the voltage drop uk=1ma×rj >0.4v generated in the switch body control loop, at this time, the voltage u=uk+ud2 of the photoelectric coupler U1 is greater than 1.1V, and the photoelectric coupler U1 is turned on; at this time, the processing module 400 can detect the disconnection signal of the closing circuit, and learn that the closing circuit is disconnected, so as to play a role in protecting the control circuit.
As shown in fig. 5, in some embodiments of the present application, the control loop detection method further includes the steps of:
step S400: when the switching-on loop where the switching-on coil is located is not broken, after the detection current passes through the first diode D2, the detection current flows to the negative electrode of the power supply through the switching-on coil and the switch body control loop 200 where the anti-tripping relay K1 is located, which are connected in parallel;
step S500: at this time, the voltage of the photo coupler U1 is smaller than the conducting voltage of the photo coupler U1, the photo coupler U1 is not conducting, and the processing module 400 cannot detect the closing loop breaking signal.
When the switching circuit is not disconnected, the detection current provided by the constant current source module 100 flows to the power supply negative electrode through the switching coil and the anti-tripping relay K1 of the switch body control circuit 200 after passing through the first diode D2, the voltage drop uk=1 mA (Ro// Rj) <0.1V generated in the switch body control circuit 200, and the voltage u=uk+ud2 <0.8V of the photo coupler U1, at this time, the photo coupler U1 is not turned on.
According to the control loop detection method provided by the embodiment of the application, the anti-tripping relay is introduced, and meanwhile, the situation that whether the closing loop is broken or not can be accurately detected, so that the defect that the traditional detection circuit cannot detect whether the closing loop is broken or not under the condition that the anti-tripping relay is introduced is overcome.
On the other hand, the embodiment of the application also provides electronic equipment, which comprises the control loop detection circuit.
Although specific embodiments are described herein, those of ordinary skill in the art will recognize that many other modifications or alternative embodiments are also within the scope of the present disclosure. For example, any of the functions and/or processing capabilities described in connection with a particular device or component may be performed by any other device or component. In addition, while various exemplary implementations and architectures have been described in terms of embodiments of the present disclosure, those of ordinary skill in the art will recognize that many other modifications to the exemplary implementations and architectures described herein are also within the scope of the present disclosure.
The embodiments of the present application have been described in detail with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application.
Claims (10)
1. A control loop detection circuit, comprising:
the input end of the constant current source module is connected with the positive electrode of the power supply, and the constant current source module is used for providing detection current;
the anode of the first diode is electrically connected with the output end of the constant current source module;
the switch body control loop comprises a closing coil and an anti-tripping relay which are connected in parallel, the input end of the switch body control loop is electrically connected with the cathode of the first diode, and the output end of the switch body control loop is connected with the negative electrode of the power supply;
the input end of the broken wire detection module is electrically connected with the output end of the constant current source module, and the output end of the broken wire detection module is grounded; the broken line detection module comprises a photoelectric coupler;
the processing module is electrically connected with the broken wire detection module;
the voltage of the photoelectric coupler is equal to the sum of the voltage drop of the first diode and the voltage drop of the switch body control loop; when the closing loop where the closing coil is located is not broken, the voltage of the photoelectric coupler is smaller than the conducting voltage of the photoelectric coupler; when a closing loop where the closing coil is broken, the voltage of the photoelectric coupler is larger than the conducting voltage of the photoelectric coupler, the photoelectric coupler is conducted, and the processing module detects a closing loop breaking signal.
2. The control loop detection circuit according to claim 1, wherein the constant current source module includes:
the collector of the first triode is connected with the positive electrode of the power supply through a plurality of first resistors connected in series;
the emitter of the second triode is electrically connected with the base electrode of the first triode, and the collector of the second triode is electrically connected with the emitter of the first triode;
one end of the second resistor is electrically connected with the emitter of the second triode, and the other end of the second resistor is electrically connected with the base of the second triode;
one end of the third resistor is electrically connected with the collector electrode of the second triode, and the other end of the third resistor is electrically connected with the anode electrode of the first diode;
the anode of the zener diode is electrically connected with the other end of the third resistor, and the cathode of the zener diode is electrically connected with the base electrode of the second triode;
and one end of the fourth resistor is electrically connected with the collector electrode of the first triode, and the other end of the fourth resistor is electrically connected with one end of the second resistor.
3. The control loop detection circuit of claim 2, wherein the first transistor is an NPN transistor and the second transistor is a PNP transistor.
4. The control loop detection circuit of claim 1, wherein the wire break detection module comprises:
the photoelectric coupler is characterized in that the collector electrode of a phototriode of the photoelectric coupler is electrically connected with the processing module, the collector electrode of the phototriode is also connected with working voltage through a fifth resistor, and the emitter electrode of the phototriode is grounded;
a capacitor connected in parallel with the light emitting diode of the photoelectric coupler;
a second diode connected in parallel with the capacitor;
and one end of the sixth resistor is electrically connected with the output end of the constant current source module and the anode of the first diode respectively, the other end of the sixth resistor is electrically connected with the anode of the light emitting diode, and the cathode of the light emitting diode is connected with the negative electrode of the power supply.
5. Control loop detection method based on a control loop detection circuit according to any of claims 1 to 4, characterized in that the control loop detection method comprises the steps of:
providing a detection current through a constant current source module;
when the switching-on loop where the switching-on coil is located is broken, the detection current flows to the negative electrode of the power supply through the loop where the anti-tripping relay is located after passing through the first diode;
at this time, the voltage of the photoelectric coupler of the broken line detection module is larger than the conducting voltage of the photoelectric coupler, the photoelectric coupler is conducted, and the processing module detects a broken line signal of the closing loop.
6. The control loop detection method according to claim 5, characterized in that the control loop detection method further comprises the steps of:
when the switching-on loop where the switching-on coil is located is not broken, the detection current flows to the negative electrode of the power supply through the switching-on coil and the anti-tripping relay which are connected in parallel in the control loop of the switch body after passing through the first diode;
at this time, the voltage of the photoelectric coupler is smaller than the conducting voltage of the photoelectric coupler, the photoelectric coupler is not conducted, and the processing module cannot detect the closing loop disconnection signal.
7. The control loop detection method according to claim 5, wherein the constant current source module includes:
the collector of the first triode is connected with the positive electrode of the power supply through a plurality of first resistors connected in series;
the emitter of the second triode is electrically connected with the base electrode of the first triode, and the collector of the second triode is electrically connected with the emitter of the first triode;
one end of the second resistor is electrically connected with the emitter of the second triode, and the other end of the second resistor is electrically connected with the base of the second triode;
one end of the third resistor is electrically connected with the collector electrode of the second triode, and the other end of the third resistor is electrically connected with the anode electrode of the first diode;
the anode of the zener diode is electrically connected with the other end of the third resistor, and the cathode of the zener diode is electrically connected with the base electrode of the second triode;
and one end of the fourth resistor is electrically connected with the collector electrode of the first triode, and the other end of the fourth resistor is electrically connected with one end of the second resistor.
8. The control loop detection method according to claim 7, wherein the step of providing the detection current through the constant current source module specifically comprises:
setting the resistance value of the third resistor according to the required detection current;
the positive electrode of the power supply provides input voltage, and the detection current is obtained after the input voltage passes through the constant current source module;
and setting the resistance value of the second resistor to enable the bias current of the zener diode to be kept constant, so that the detection current is kept constant.
9. The control loop detection method according to claim 8, wherein the step of supplying the detection current through the constant current source module further comprises:
and filtering interference signals existing in the input voltage through the first resistor.
10. An electronic device comprising the control loop detection circuit according to any one of claims 1 to 4.
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