Square wave injection type elevator door lock circuit state detection method

Abstract

The invention discloses a square wave injection type elevator door lock circuit state detection method which is realized on the basis of a square wave injection type elevator door lock circuit state detection circuit. The square wave injection type elevator door lock circuit state detection circuit comprises an elevator door lock series loop, a main control switch circuit, a high-voltage injection circuit, a first controllable switch circuit, a second controllable switch circuit, a first detection circuit, a second detection circuit and a detection controller. The elevator door lock series circuit comprises at least two landing door switches, all the landing door switches are connected in series to form the elevator door lock series circuit, one end of the elevator door lock series circuit is a power supply end, and the other end of the elevator door lock series circuit is a low-voltage end. According to the square wave injection type elevator door lock circuit state detection method, the problem that in the prior art, a triode Q1 cannot work under the control of a low control voltage and cannot ensure that a large current flows through is solved.

Description

Technical Field

[0001] The invention relates to the field of elevator door lock circuit state monitoring, and in particular to a square wave injection type elevator door lock circuit state detection method. Background Art

[0002] A Chinese patent discloses a safety door lock switch circuit with an injection current short circuit detection function, application number: CN202121265308.0. The safety door lock switch circuit with an injection current short circuit detection function includes: a safety door lock switch, a voltage input module and a detection module. All safety door lock switches are connected in series to form a switch series circuit. A pair of voltage input modules and detection modules are installed at each end of each safety door lock switch. The control end of the voltage input module is used to connect to the output end of the elevator monitoring box. The voltage input end of the voltage input module is connected to the VCC voltage. The voltage output end of the voltage input module is connected to the end of the safety door lock switch. The input end of the detection module is connected to the end of the safety door lock switch, and the output end of the detection module is connected to the input end of the elevator monitoring box.

[0003] Although the safety door lock switch circuit with injection current type short circuit detection function can detect which safety door lock switch is short-circuited, the safety door lock switch circuit with injection current type short circuit detection function still has the following disadvantages: the base of transistor Q1 needs to be connected to a control voltage greater than 0.3v, the control voltage is very small, and the safety door lock switch circuit needs an injection voltage of 110v to detect a voltage after a significant voltage drop at one end. Therefore, the collector of transistor Q1 needs to supply an injection voltage of 110v to the safety door lock switch circuit. It is necessary to find a transistor that can work under a lower control voltage and can supply a larger current. The transistor Q1 cannot meet this requirement. Summary of the invention

[0004] The present invention provides a square wave injection type elevator door lock circuit state detection method to solve the problem in the prior art that the transistor Q1 cannot satisfy both working under a relatively low control voltage and ensuring a relatively large current flow.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a square wave injection type elevator door lock circuit state detection method, which is implemented based on a square wave injection type elevator door lock circuit state detection circuit, and the square wave injection type elevator door lock circuit state detection circuit comprises: an elevator door lock series circuit, a main control switch circuit, a high voltage injection circuit, a first controllable switch circuit, a second controllable switch circuit, a first detection circuit, a second detection circuit and a detection controller; the elevator door lock series circuit comprises: at least two floor door switches, all floor door switches are connected in series to form an elevator door lock series circuit, one end of the elevator door lock series circuit is a power supply end, and the other end of the elevator door lock series circuit is a low voltage end; an external elevator power supply circuit supplies power to the power supply end of the elevator door lock series circuit through the main control switch circuit, and the control end of the main control switch circuit is connected to the detection controller The first output end of the controller, the low voltage end of the elevator door lock series circuit is connected to the first detection circuit input end, and the output end of the first detection circuit is connected to the first input end of the detection controller; the high voltage end of the high voltage injection circuit is connected to the injection voltage VDD, the low voltage end of the high voltage injection circuit is connected to the power supply end of the elevator door lock series circuit through the first controllable switch circuit, and the control end of the first controllable switch circuit is connected to the second output end of the detection controller; the electrical connection points between the door switches of two adjacent floors are connected to the input end of the second detection circuit through the second controllable switch circuit, the control end of the second controllable switch circuit is connected to the low voltage output end of the first controllable switch circuit, and the output end of the second detection circuit is connected to the second input end of the detection controller. There are several second detection circuits, and there are also several second input ends of the detection controller corresponding to the second detection circuits. The square wave injection type elevator door lock circuit state detection method comprises the following steps: S1, the first output end of the detection controller outputs a command to cut off the external elevator power supply circuit to the main control switch circuit, and the main control switch circuit cuts off the connection between the power supply end of the elevator door lock series circuit and the external elevator power supply circuit; S2, the second output end of the detection controller outputs a command to connect the high voltage injection circuit to the first controllable switch circuit, and the first controllable switch circuit connects the power supply end of the elevator door lock series circuit to the connected high voltage injection circuit; S3, the first input end of the detection controller obtains the voltage U1 at the low voltage end of the elevator door lock series circuit through the first detection circuit, and determines whether U1 is greater than the first set value. If so, it is determined that all floor door switches are closed and step S5 is performed; if not, step S4 is performed; S4, the second input end of the detection controller obtains the voltage U2 at the connection of two adjacent floor door switches through the second detection circuit, and finds the open floor door switch by checking U2 of each second detection circuit; S5, outputs the detection result and ends the detection.

[0007] Preferably, assuming that there are N second detection circuits, the second detection circuits are numbered in sequence from the high-voltage end to the low-voltage end of the elevator door lock series circuit, and the second detection circuit closest to the high-voltage end of the elevator door lock series circuit is numbered 1, assuming that the initial value of i is 0, the steps of finding the open floor door switch by checking U2 of each second detection circuit in step S4 are as follows: S41, calculate i=i+1; S42, determine whether U2 of the second detection circuit labeled i is greater than the second set value, if so, proceed to step S43; if not, determine that the floor door switch between the second detection circuit labeled i and the second detection circuit labeled i-1 is an open floor door switch and execute step S44; S43, determine whether i is greater than or equal to N, if so, proceed to step S44; if not, return to step S41; S44, the search operation ends.

[0008] Preferably, the high-voltage injection circuit comprises: a diode D1 , an anode of the diode D1 being a high-voltage end of the high-voltage injection circuit, and a cathode of the diode D1 being a low-voltage end of the high-voltage injection circuit.

[0009] Preferably, the first controllable switch circuit includes: a photocoupler U1 and a transistor Q1, the anode of the diode of the photocoupler U1 is connected to the DC power supply VCC, the cathode of the diode of the photocoupler U1 is connected to the collector of the transistor Q1, the collector of the transistor Q1 is the low-voltage output end of the first controllable switch circuit, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is the control end of the first controllable switch circuit, one end of the thyristor in the photocoupler U1 is connected to the cathode of the diode D1, and the other end of the thyristor in the photocoupler U1 is grounded.

[0010] Preferably, the second controllable switch circuit includes: a photocoupler U2, a resistor R3 and a resistor R4, the anode of the diode in the photocoupler U2 is the control end of the second controllable switch circuit, the cathode of the diode in the photocoupler U2 is grounded, one end of the thyristor in the photocoupler U2 is connected to the electrical connection point between the two adjacent door switches, the other end of the thyristor in the photocoupler U2 is connected to one end of the resistor R4 through the resistor R3, one end of the resistor R4 is grounded, and the electrical connection point between the resistor R3 and the resistor R4 is connected to the input end of the second detection circuit.

[0011] Preferably, the second detection circuit includes: a comparator U3, a resistor R5 and a resistor R6, the inverting input terminal of the comparator U3 is the input terminal of the second detection circuit, the non-inverting input terminal of the comparator U3 is connected to the first terminal of the resistor R5, the second terminal of the resistor R5 is connected to the DC power supply VCC, the first terminal of the resistor R5 is grounded through the resistor R6, and the output terminal of the comparator U3 is the output terminal of the second detection circuit.

[0012] Preferably, the first detection circuit includes: a resistor R1 and a resistor R2, the first end of the resistor R1 is the input end of the first detection circuit, the second end of the resistor R1 is grounded through the resistor R2, and the electrical connection point between the resistor R1 and the resistor R2 is the output end of the first detection circuit.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1) In the present application, by setting a photoelectric coupler U1 in the first controllable switch circuit and a photoelectric coupler U2 in the second controllable switch circuit, the circuit connected to the elevator door lock series circuit is separated from the control circuit. Since the circuit connected to the elevator door lock series circuit requires a large current to pass through, and the control circuit has a small current, this can meet the requirements and ensure that the large current circuit and the small current circuit can operate normally, be isolated from each other, and do not interfere with each other.

[0015] 2) The present application breaks the idea in the prior art that only by injecting high voltage at one end of each floor door switch can the damage of the specific floor door switch be detected. The present application still adopts the idea of ​​injecting high voltage, but only injects high voltage at the power supply end of the elevator door lock series circuit, and no longer injects high voltage at one end of each floor door switch. There are two groups of detections during the detection. The first detection is that the first detection circuit detects whether there is a normal voltage output at the low-voltage end of the elevator door lock series circuit. If there is no normal voltage output, it proves that one of the floor door switches among all the floor door switches is damaged, and subsequent detection is required; in the subsequent second detection, it is only necessary to detect whether there is a normal voltage output at the electrical connection point of the two adjacent floor door switches. If the previous one If the electrical connection points of the first two adjacent floor door switches have normal voltage output, and the electrical connection points of the second two adjacent floor door switches do not have normal voltage output, it proves that the floor door switch between the two detection points is in the disconnected state, not the normal closed state. When the elevator is normally stopped, all floor door switches are in the closed state. If they cannot be closed, it proves that the floor door switch is damaged. In this way, voltage is only input at the power supply end of the elevator door lock series circuit. There is no need to control multiple high-voltage injection circuits to be connected in sequence in the prior art, which leads to a waste of circuit control action time. It is only necessary to detect and judge multiple detection points at the same time. The software judgment time is shorter than that of controlling multiple high-voltage injection circuits to be connected in sequence, thereby improving the detection and judgment efficiency.

[0016] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the circuit diagram of the square wave injection type elevator door lock circuit status detection circuit. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0019] like Figure 1As shown, the present invention discloses a square wave injection type elevator door lock circuit state detection method, the square wave injection type elevator door lock circuit state detection method is implemented based on a square wave injection type elevator door lock circuit state detection circuit, the square wave injection type elevator door lock circuit state detection circuit comprises: an elevator door lock series circuit, a main control switch circuit (which is a controllable relay RL1), a high voltage injection circuit, a first controllable switch circuit, a second controllable switch circuit, a first detection circuit, a second detection circuit and a detection controller; the elevator door lock series circuit comprises: at least two floor door switches, all floor door switches are connected in series to form an elevator door lock series circuit, one end of the elevator door lock series circuit is a power supply end, and the other end of the elevator door lock series circuit is a low voltage end; the external elevator power supply circuit VEE supplies power to the power supply end of the elevator door lock series circuit through the main control switch circuit, and the control end of the main control switch circuit is connected to the detection controller. The first output end of the controller and the low voltage end of the elevator door lock series circuit are connected to the input end of the first detection circuit, and the output end OUT1 of the first detection circuit is connected to the first input end of the detection controller; the high voltage end of the high voltage injection circuit is connected to the injection voltage VDD, and the low voltage end of the high voltage injection circuit is connected to the power supply end of the elevator door lock series circuit through the first controllable switch circuit, and the control end INPUT1 of the first controllable switch circuit is connected to the second output end of the detection controller; the electrical connection points between the door switches of two adjacent floors are connected to the input end of the second detection circuit through the second controllable switch circuit, and the control end of the second controllable switch circuit is connected to the low voltage output end of the first controllable switch circuit, and the output end OUT2 of the second detection circuit is connected to the second input end of the detection controller. There are several second detection circuits, and there are also several second input ends of the detection controller corresponding to the second detection circuits. The square wave injection type elevator door lock circuit state detection method comprises the following steps: S1, the first output end of the detection controller outputs a command to cut off the external elevator power supply circuit to the main control switch circuit, and the main control switch circuit cuts off the connection between the power supply end of the elevator door lock series circuit and the external elevator power supply circuit; S2, the second output end of the detection controller outputs a command to connect the high voltage injection circuit to the first controllable switch circuit, and the first controllable switch circuit connects the power supply end of the elevator door lock series circuit to the connected high voltage injection circuit; S3, the first input end of the detection controller obtains the voltage U1 at the low voltage end of the elevator door lock series circuit through the first detection circuit, and determines whether U1 is greater than the first set value. If so, it is determined that all floor door switches are closed and step S5 is performed; if not, step S4 is performed; S4, the second input end of the detection controller obtains the voltage U2 at the connection of two adjacent floor door switches through the second detection circuit, and finds the open floor door switch by checking U2 of each second detection circuit; S5, outputs the detection result and ends the detection.

[0020] Assume that there are N second detection circuits, and the second detection circuits are numbered in sequence from the high voltage end to the low voltage end of the elevator door lock series circuit, and the second detection circuit closest to the high voltage end of the elevator door lock series circuit is numbered 1, and the initial value of i is 0. The steps of finding the open floor door switch by checking U2 of each second detection circuit in step S4 are as follows: S41, calculate i=i+1; S42, determine whether U2 of the second detection circuit with number i is greater than the second set value, if so, proceed to step S43; if not, determine that the floor door switch between the second detection circuit with number i and the second detection circuit with number i-1 is an open floor door switch and execute step S44; S43, determine whether i is greater than or equal to N, if so, proceed to step S44; if not, return to step S41; S44, the search operation ends. This is the step of finding the disconnected floor door switch, that is: the switch that cannot be closed normally is a damaged switch.

[0021] The high voltage injection circuit includes: a diode D1, wherein the anode of the diode D1 is the high voltage end of the high voltage injection circuit, and the cathode of the diode D1 is the low voltage end of the high voltage injection circuit. The diode D1 limits the current direction to prevent the current from flowing in the reverse direction.

[0022] The first controllable switch circuit includes: a photocoupler U1 and a transistor Q1, wherein the anode of the diode of the photocoupler U1 is connected to the DC power supply VCC, the cathode of the diode of the photocoupler U1 is connected to the collector of the transistor Q1, the collector of the transistor Q1 is the low-voltage output end of the first controllable switch circuit, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is the control end of the first controllable switch circuit, one end of the thyristor in the photocoupler U1 is connected to the cathode of the diode D1, and the other end of the thyristor in the photocoupler U1 is grounded. The diodes in the photocoupler U1 and the photocoupler U2 emit light after being energized, and the thyristor is closed after emitting light, thereby controlling the opening and closing of the circuit. The base of the transistor Q1 is closed only when it receives a voltage greater than 0.3v, at which time the diode in the photocoupler U1 is energized to emit light, that is, the closure of the thyristor in the photocoupler U1 is controlled, so that the output end of the high-voltage injection circuit has a voltage output, and high voltage is injected at this time.

[0023] The second controllable switch circuit includes: a photocoupler U2, a resistor R3 and a resistor R4, the anode of the diode in the photocoupler U2 is the control end of the second controllable switch circuit, the cathode of the diode in the photocoupler U2 is grounded, one end of the thyristor in the photocoupler U2 is connected to the electrical connection point between the door switches of two adjacent floors, the other end of the thyristor in the photocoupler U2 is connected to one end of the resistor R4 through the resistor R3, one end of the resistor R4 is grounded, and the electrical connection point between the resistor R3 and the resistor R4 is connected to the input end of the second detection circuit. The photocoupler U2 is closed only when the first controllable switch circuit is closed, so as to avoid the discharge of the resistors R3 and R4 when the external elevator power supply circuit VEE supplies power to the elevator door lock series circuit (at this time, it is the normal working state of the elevator door lock series circuit), thereby reducing the waste of electric energy.

[0024] The second detection circuit includes: a comparator U3, a resistor R5 and a resistor R6, the inverting input end of the comparator U3 is the input end of the second detection circuit, the non-inverting input end of the comparator U3 is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the DC power supply VCC, the first end of the resistor R5 is grounded through the resistor R6, and the output end of the comparator U3 is the output end of the second detection circuit. The DC power supply VCC outputs a reference voltage through the resistor R5 and the resistor R6, and the reference voltage is the basis for the comparison of the comparator U3. When the detected voltage is higher than this voltage, the comparator U3 outputs a first output value, and when the detected voltage is lower than this voltage, the comparator U3 outputs a second output value. The first output value and the second output value are different. By judging the different first output value and second output value, it is judged whether the normal voltage is detected.

[0025] The first detection circuit includes: a resistor R1 and a resistor R2, wherein the first end of the resistor R1 is the input end of the first detection circuit, the second end of the resistor R1 is grounded through the resistor R2, and the electrical connection point between the resistor R1 and the resistor R2 is the output end of the first detection circuit. The resistor R1 and the resistor R2 divide each other to reduce the output, thereby facilitating access to the first input end of the detection controller.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A square wave injection elevator door lock circuit state detection method, characterized in that: The square wave injection type elevator door lock circuit state detection method is implemented based on a square wave injection type elevator door lock circuit state detection circuit, and the square wave injection type elevator door lock circuit state detection circuit includes: an elevator door lock series circuit, a main control switch circuit, a high voltage injection circuit, a first controllable switch circuit, a second controllable switch circuit, a first detection circuit, a second detection circuit and a detection controller; The elevator door lock series circuit includes: at least two floor door switches, all the floor door switches are connected in series to form an elevator door lock series circuit, one end of the elevator door lock series circuit is a power supply end, and the other end of the elevator door lock series circuit is a low voltage end; The external elevator power supply circuit supplies power to the power supply end of the elevator door lock series circuit through the main control switch circuit, the control end of the main control switch circuit is connected to the first output end of the detection controller, the low voltage end of the elevator door lock series circuit is connected to the input end of the first detection circuit, and the output end of the first detection circuit is connected to the first input end of the detection controller; The high voltage end of the high voltage injection circuit is connected to the injection voltage VDD, the low voltage end of the high voltage injection circuit is connected to the power supply end of the elevator door lock series circuit through the first controllable switch circuit, and the control end of the first controllable switch circuit is connected to the second output end of the detection controller; The electrical connection points between the switches of two adjacent doors are all connected to the input end of the second detection circuit through the second controllable switch circuit, the control end of the second controllable switch circuit is connected to the low-voltage output end of the first controllable switch circuit, the output end of the second detection circuit is connected to the second input end of the detection controller, there are a plurality of second detection circuits, and there are also a plurality of second input ends of the detection controller corresponding to the second detection circuits; The square wave injection type elevator door lock circuit state detection method comprises the following steps: S1, the first output end of the detection controller outputs a command to cut off the external elevator power supply circuit to the main control switch circuit, and the main control switch circuit cuts off the connection between the power supply end of the elevator door lock series circuit and the external elevator power supply circuit; S2, the second output end of the detection controller outputs a command to connect the high-voltage injection circuit to the first controllable switch circuit, and the first controllable switch circuit connects the power supply end of the elevator door lock series circuit to the high-voltage injection circuit; S3, the first input end of the detection controller obtains the voltage at the low voltage end of the elevator door lock series circuit through the first detection circuit as U1, and determines whether U1 is greater than the first set value. If so, it is determined that all floor door switches are closed and step S5 is performed; if not, step S4 is performed; S4, the second input end of the detection controller obtains the voltage U2 at the connection point of the door switches of two adjacent floors through the second detection circuit, and finds the open-circuit floor door switch by checking U2 of each second detection circuit; S5. Output the test result and end the test.

2. The square wave injection type elevator door lock circuit state detection method according to claim 1 is characterized in that: Assume that there are N second detection circuits, and number the second detection circuits in sequence from the high voltage end to the low voltage end of the elevator door lock series circuit, and the second detection circuit closest to the high voltage end of the elevator door lock series circuit is numbered 1, and the initial value of i is 0. In step S4, the steps of finding the open floor door switch by checking U2 of each second detection circuit are as follows: S41, calculating i=i+1; S42, determining whether U2 of the second detection circuit labeled i is greater than a second set value, if so, proceeding to step S43; If not, it is determined that the landing door switch between the second detection circuit labeled i and the second detection circuit labeled i-1 is an open-circuit landing door switch and step S44 is executed; S43, determine whether i is greater than or equal to N, if so, proceed to step S44; if not, return to step S41; S44. The search operation ends.

3. The square wave injection type elevator door lock circuit state detection method according to claim 2 is characterized in that: The high voltage injection circuit comprises: a diode D1, an anode of the diode D1 is a high voltage end of the high voltage injection circuit, and a cathode of the diode D1 is a low voltage end of the high voltage injection circuit.

4. The square wave injection type elevator door lock circuit state detection method according to claim 3 is characterized in that: The first controllable switch circuit includes: a photocoupler U1 and a transistor Q1, the anode of the diode of the photocoupler U1 is connected to the DC power supply VCC, the cathode of the diode of the photocoupler U1 is connected to the collector of the transistor Q1, the collector of the transistor Q1 is the low-voltage output end of the first controllable switch circuit, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is the control end of the first controllable switch circuit, one end of the thyristor in the photocoupler U1 is connected to the cathode of the diode D1, and the other end of the thyristor in the photocoupler U1 is grounded.

5. The square wave injection type elevator door lock circuit state detection method according to claim 4 is characterized in that: The second controllable switch circuit includes: a photocoupler U2, a resistor R3 and a resistor R4. The anode of the diode in the photocoupler U2 is the control end of the second controllable switch circuit, the cathode of the diode in the photocoupler U2 is grounded, one end of the thyristor in the photocoupler U2 is connected to the electrical connection point between the switches of two adjacent doors, the other end of the thyristor in the photocoupler U2 is connected to one end of the resistor R4 through the resistor R3, one end of the resistor R4 is grounded, and the electrical connection point between the resistor R3 and the resistor R4 is connected to the input end of the second detection circuit.

6. The square wave injection type elevator door lock circuit state detection method according to claim 5, characterized in that: The second detection circuit includes: a comparator U3, a resistor R5 and a resistor R6, the inverting input terminal of the comparator U3 is the input terminal of the second detection circuit, the non-inverting input terminal of the comparator U3 is connected to the first terminal of the resistor R5, the second terminal of the resistor R5 is connected to the DC power supply VCC, the first terminal of the resistor R5 is grounded through the resistor R6, and the output terminal of the comparator U3 is the output terminal of the second detection circuit.

7. The square wave injection type elevator door lock circuit state detection method according to any one of claims 1 to 6, characterized in that: The first detection circuit includes: a resistor R1 and a resistor R2, wherein the first end of the resistor R1 is the input end of the first detection circuit, the second end of the resistor R1 is grounded through the resistor R2, and the electrical connection point between the resistor R1 and the resistor R2 is the output end of the first detection circuit.

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