Overvoltage protection circuit of elevator direct current door motor and elevator

Abstract

The overvoltage protection circuit of the elevator direct-current door motor is arranged between a door motor direct-current power source and an elevator door motor, and the overvoltage protection circuit of the elevator direct-current door motor comprises an overvoltage detection module, a signal self-locking module and a relay driving module; the signal self-locking module and the portal crane direct-current power supply are connected with the overvoltage detection module; the overvoltage detection module, the elevator door motor and the signal self-locking module are connected with the relay driving module. According to the overvoltage protection circuit, the influence of an input voltage signal on the relay driving module can be reduced, the defect of false triggering of the overvoltage protection circuit caused by input voltage interference or input high-voltage alternating current can be improved, the stability of the overvoltage protection circuit can be improved, and manpower and material resources required by circuit maintenance can be saved. The circuit can be widely applied to the technical field of electronic circuits.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to an overvoltage protection circuit for an elevator DC door machine and an elevator. Background Art

[0002] In the related art, an overvoltage protection circuit is typically installed in the elevator DC door machine and DC power supply. This protection circuit typically includes an interconnected overvoltage detection module and a control module. When the overvoltage detection module detects an overvoltage, the control module promptly disconnects the circuit to protect the entire circuit. However, because the overvoltage detection module is connected to the control module, it is easily falsely triggered by interference or high-voltage glitches, ultimately leading to false triggering of the overvoltage protection, affecting the normal operation of the elevator DC door machine. Therefore, there are still technical problems that need to be solved in the related art. Utility Model Content

[0003] The purpose of this application is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0004] To this end, an object of an embodiment of the present application is to provide an overvoltage protection circuit for an elevator DC door machine and an elevator, wherein the overvoltage protection circuit for the elevator DC door machine can improve the stability of the elevator DC door machine.

[0005] In order to achieve the above-mentioned technical objectives, the technical solution adopted in the embodiment of the present application includes: an overvoltage protection circuit for an elevator DC door machine, including: a circuit is arranged between the door machine DC power supply and the elevator door machine, the circuit includes: an overvoltage detection module, a signal self-locking module and a relay drive module; the signal self-locking module and the door machine DC power supply are connected to the overvoltage detection module; the overvoltage detection module, the elevator door machine and the signal self-locking module are connected to the relay drive module.

[0006] In addition, the overvoltage protection circuit of an elevator DC door machine according to the above embodiment of the present invention may also have the following additional technical features:

[0007] Furthermore, in an embodiment of the present application, the signal self-locking module includes a fourth resistor, a second capacitor, a third capacitor, a first transistor and a second transistor; one end of the fourth resistor serves as the first input end of the signal self-locking module, the other end of the fourth resistor and one end of the third capacitor are connected to the emitter of the first transistor, the other end of the third capacitor and the collector of the second transistor are connected to the base of the first transistor, the collector of the first transistor and one end of the second capacitor are connected to the base of the second transistor, and the emitter of the second transistor and the other end of the second capacitor are both grounded; the base of the first transistor serves as the output end of the signal self-locking module, and the collector of the first transistor serves as the second input end of the signal self-locking module.

[0008] Furthermore, in the embodiment of the present application, the first transistor is a PNP transistor; and the second transistor is an NPN transistor.

[0009] Furthermore, in an embodiment of the present application, the overvoltage detection module includes a first diode, a second diode, a first resistor, a second resistor, a third resistor and a first capacitor; the positive pole of the first diode is connected to the input voltage, and the negative pole of the first diode is connected to one end of the first resistor; the other end of the first resistor, one end of the first capacitor and one end of the second resistor are connected to the negative pole of the second diode, one end of the third resistor is connected to the positive pole of the second diode, and the other end of the third resistor, the other end of the second resistor and the other end of the first capacitor are all grounded; the positive pole of the second diode serves as the first output end of the overvoltage detection module, the first output end of the overvoltage detection module is connected to the input end of the signal self-locking module, the negative pole of the first diode serves as the second output end of the overvoltage detection module, and the second output end of the overvoltage detection module is connected to the relay drive module.

[0010] Furthermore, in an embodiment of the present application, the second diode is a voltage stabilizing diode.

[0011] Furthermore, in an embodiment of the present application, the relay driving module includes a voltage divider unit, a power supply voltage stabilizing unit and a relay; the input end of the voltage divider unit is connected to the overvoltage detection module, and the output end of the voltage divider unit is connected to the power supply voltage stabilizing unit; the power supply voltage stabilizing unit is connected to the relay.

[0012] Furthermore, in an embodiment of the present application, the power supply voltage stabilizing unit includes a third diode, a fourth diode, a sixth resistor, a third transistor, a voltage reference chip, a seventh resistor and an eighth resistor; the output end of the voltage divider unit, the first input end of the signal self-locking module and the collector of the third transistor are connected to one end of the sixth resistor; the other end of the sixth resistor and the base of the third transistor are connected to the cathode of the voltage reference chip; one end of the eighth resistor, the positive electrode of the third diode and the positive electrode of the fourth diode are connected to the anode of the voltage reference chip, and the negative electrode of the third diode and the negative electrode of the fourth diode are connected in parallel to the output end of the signal self-locking module; one end of the seventh resistor and the other end of the eighth resistor are connected to the reference end of the voltage reference chip; the other end of the seventh resistor is connected to the emitter of the third transistor.

[0013] Furthermore, in the embodiment of the present application, the third transistor is an NPN transistor.

[0014] Furthermore, in an embodiment of the present application, the voltage divider unit includes one or more resistors; when the voltage divider unit includes more than two resistors, any two of the more than two resistors are connected in series or any two of the resistors are connected in parallel.

[0015] On the other hand, an embodiment of the present application further provides an elevator, comprising an overvoltage protection circuit for an elevator DC door machine as described in any of the above items.

[0016] The advantages and benefits of this application will be partially given in the following description, and partially become apparent from the following description, or learned through practice of this application:

[0017] The present application can add a signal self-locking module to the overvoltage detection module and the relay drive module. The signal self-locking module can reduce the impact of the input voltage signal on the relay drive module, and can improve the false triggering defect of the overvoltage protection circuit caused by input voltage interference or input high-voltage AC power. The present application can improve the stability of the overvoltage protection circuit and save the manpower and material resources required for circuit maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the circuit structure of an overvoltage protection circuit for an elevator DC door machine in another specific embodiment of the present utility model;

[0019] Figure 2 Schematic diagram of the circuit structure of an overvoltage protection circuit for an elevator DC door machine in another specific embodiment of the present utility model;

[0020] Figure 3This is a schematic diagram of the steps for implementing the functions of the overvoltage protection circuit of the elevator DC door machine in a specific embodiment of the present utility model;

[0021] Figure 4 The present invention is a schematic diagram of an application scenario of an overvoltage protection circuit for an elevator DC door machine in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The overvoltage protection circuit of the elevator DC door machine and the principle and process of the elevator in the embodiments of the present invention are explained below.

[0023] This application provides an overvoltage protection circuit for an elevator DC door operator. This circuit can be installed between the door operator's DC power supply and the elevator door operator. Specifically, the door operator's DC power supply can be connected to the overvoltage protection circuit, which in turn can be connected to the elevator door operator. The circuit can include an overvoltage detection module 1, a signal self-locking module 2, and a relay driver module 3. The signal self-locking module 2 and the door operator's DC power supply can be connected to the overvoltage detection module 1. The overvoltage detection module 1, the elevator door operator, and the signal self-locking module 2 can be connected to the relay driver module 3.

[0024] Further, refer to Figure 1 In some embodiments of the present application, the signal self-locking module may include a fourth resistor R4, a second capacitor C2, a third capacitor C3, a first transistor Q1 and a second transistor Q2; one end of the fourth resistor R4 serves as the first input end of the signal self-locking module 2, the other end of the fourth resistor R4 and one end of the third capacitor C3 can be connected to the emitter of the first transistor Q1, the other end of the third capacitor C3 and the collector of the second transistor Q2 can be connected to the base of the first transistor Q1, the collector of the first transistor Q1 and one end of the second capacitor C2 can be connected to the base of the second transistor Q2, and the emitter of the second transistor Q2 and the other end of the second capacitor C2 are both grounded; the base of the first transistor Q1 serves as the output end of the signal self-locking module 2, and the collector of the first transistor Q1 serves as the second input end of the signal self-locking module 2.

[0025] Furthermore, in some embodiments of the present application, the first transistor Q1 is a PNP transistor; and the second transistor Q2 is an NPN transistor.

[0026] Furthermore, in some embodiments of the present application, the overvoltage detection module may include a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1. The anode of the first diode D1 may be connected to the input voltage VIN, and the cathode of the first diode D1 may be connected to one end of the first resistor R1. The other end of the first resistor R1, one end of the first capacitor C1, and one end of the second resistor R2 may be connected to the cathode of the second diode D2. One end of the third resistor R3 may be connected to the anode of the second diode D2. The other end of the third resistor R3, the other end of the second resistor R2, and the other end of the first capacitor C1 are all grounded. The anode of the second diode D2 serves as the first output end of the overvoltage detection module 1. The first output end of the overvoltage detection module 1 may be connected to the input end of the signal self-locking module 2. The cathode of the first diode D1 may serve as the second output end of the overvoltage detection module 1. The second output end of the overvoltage detection module 1 may be connected to the relay driver module 3.

[0027] Further, refer to Figure 1 In some embodiments of the present application, the second diode D2 is a Zener diode.

[0028] Further, refer to Figure 1 In some embodiments of the present application, the relay driving module may include a voltage divider unit 31, a power supply voltage stabilizing unit 32, and a relay 33; the input end of the voltage divider unit 31 may be connected to the overvoltage detection module 1, and the output end of the voltage divider unit 31 may be connected to the power supply voltage stabilizing unit 32. The power supply voltage stabilizing unit 32 may be connected to the relay 33. The first end of the connecting coil in the relay may be connected to one end of the seventh resistor R7, the second end of the connecting coil in the relay may be connected to one end of the eighth resistor R8, the third end of the relay may be connected to the output VIN of the door operator's DC power supply, and the other end may be connected to the door operator's power supply input VCC.

[0029] Further, refer to Figure 1In some embodiments of the present application, the power supply stabilization unit may include a third diode D3, a fourth diode D4, a sixth resistor R6, a third transistor Q3, a voltage reference chip U1, a seventh resistor R7, and an eighth resistor R8; the output end of the voltage divider unit, the first input end of the signal self-locking module, and the collector of the third transistor Q3 can be connected to one end of the sixth resistor R6; the other end of the sixth resistor R6 and the base of the third transistor Q3 can be connected to the cathode K of the voltage reference chip U1; one end of the eighth resistor R8, the anode of the third diode D3, and the anode of the fourth diode D4 can be connected to the anode A of the voltage reference chip U1, and the cathode of the third diode D3 and the cathode of the fourth diode D4 can be connected in parallel to the output end of the signal self-locking module; one end of the seventh resistor R7 and the other end of the eighth resistor R8 can be connected to the reference end R of the voltage reference chip U1; the other end of the seventh resistor R7 can be connected to the emitter of the third transistor Q3.

[0030] Further, refer to Figure 1 In some embodiments of the present application, the third transistor Q3 is an NPN transistor.

[0031] Further, refer to Figure 1 In some embodiments of the present application, the voltage dividing unit may include one or more resistors. Figure 1 In the embodiment, the voltage dividing unit may be composed of a fifth resistor R5. When the voltage dividing unit includes more than two resistors, any two of the more than two resistors are connected in series or in parallel.

[0032] The specific calculation principle of this application is explained below with reference to the accompanying drawings:

[0033] Reference Figure 2 、 Figure 3 as well as Figure 4 ,exist Figure 2 In the circuit, the circuit may include: an overvoltage detection module 101, a signal self-locking module 102, and a relay module 103. Figure 4 The externally connected network may include: the DC power output terminal of the door machine, which is also the input voltage VIN of the overvoltage detection module, the power supply input terminal VCC of the door machine, and the DC power output ground GND of the door machine.

[0034] In the overvoltage detection module 101, the DC power supply output of the door operator is connected to the first diode D1. The first diode D1 plays a role in preventing reverse connection. The input voltage VIN is divided by the first resistor R1 and the second resistor R2. The voltage across the second resistor R2 is: The first capacitor C1 stabilizes the voltage across the second resistor R2, reducing the risk of false triggering of the overvoltage protection.

[0035] When the voltage at the output terminal (VIN) of the DC power supply of the door operator is within the normal range allowed by the door operator, the voltage across the second resistor R2 does not exceed the stable voltage Vz of the Zener diode D2, and the Zener diode D2 is cut off. At this time, almost no current flows through the Zener diode D2, and the transistor Q2 is not turned on, that is, no overvoltage protection trigger signal is output.

[0036] When the voltage at the output end (VIN) of the DC power supply of the door operator exceeds the normal range allowed by the door operator, that is, when the input is overvoltage, the voltage across the resistor R2 exceeds the stable voltage Vz of the Zener diode D2, and the Zener diode D2 works to clamp the voltage across R2 at the stable voltage Vz of the Zener diode D2. At this time, current flows through the Zener diode D2, current flows through the base of the second transistor Q2, the second transistor Q2 is turned on, and the overvoltage protection trigger signal is output.

[0037] By adjusting the resistance of the first resistor R1 and the second resistor R2, the threshold of the overvoltage protection trigger can be roughly adjusted to approximately The third resistor R3 acts as a shunt, that is, part of the current flowing through the Zener diode D2 will flow to the third resistor R3, reducing the current flowing through the base of the second transistor Q2 and affecting the conduction of the second transistor Q2. Therefore, the threshold for triggering the overvoltage protection can be fine-tuned by adjusting the third resistor R3.

[0038] In the signal self-locking module 102 , the first transistor Q1 and the second transistor Q2 form a signal self-locking module.

[0039] When the voltage at the DC power supply output terminal (VIN) of the door machine is within the normal range allowed by the door machine, the second transistor Q2 is not conducting, no current flows through the base of the first transistor Q1, and the first transistor Q1 is also not conducting, and the drive circuit is not opened.

[0040] Reference Figure 3 When an overvoltage condition occurs, the second transistor Q2 is turned on, and the base of the first transistor Q1 is pulled low. Current flows through the base of the first transistor Q1 via the fifth resistor R5 and the fourth resistor R4, turning on the first transistor Q1. After the first transistor Q1 is turned on, part of the current flows through the fifth resistor R5, the fourth resistor R4, and the C and E poles of the first transistor Q1, and finally flows through the second transistor Q2, continuing to turn on the second transistor Q2. At this time, the first transistor Q1 and the second transistor Q2 form a closed loop and lock, and the two transistors are continuously turned on, continuously opening the drive circuit for the relay driver module 103. The second capacitor C2 and the third capacitor C3 can act as a filter to prevent the overvoltage protection from being mistakenly triggered by interference or high-voltage glitches, affecting the normal operation of the door machine.

[0041] Once the overvoltage detection module 101 outputs an overvoltage protection trigger signal, the first transistor Q1 and the second transistor Q2 in the signal self-locking module 102 form a closed loop and lock, continuously opening the drive circuit. At this time, it is no longer affected by the input voltage signal, and can avoid repeated action of the overvoltage protection module due to unstable input voltage or input high-voltage AC power, which can prevent the door machine from being unable to effectively disconnect the power supply.

[0042] In the relay driver module 103, the sixth resistor R6, the third transistor Q3, the voltage reference chip U1, the resistor R7, and the resistor R8 form a voltage source module. The voltage source output voltage (i.e., the sum of the voltages across the resistors R7 and R8) is Vref can be set near the rated voltage of relay K1 and less than the overvoltage protection threshold voltage.

[0043] When an overvoltage condition occurs, the signal self-locking module 102 continuously opens the drive circuit, pulling the collector voltage of the second transistor Q2 low. The DC power output terminal (VIN) of the door operator is supplied to the voltage source module through the first diode D1 and the fifth resistor R5, generating a voltage source Vref. This voltage source Vref powers the coil of relay K1, opening the normally closed contacts of relay K1 and severing the connection between the DC power output terminal (VIN) and the power input terminal (VCC) of the door operator. This disconnects the door operator power supply and the power supply circuit of the door operator product, protecting the door operator product.

[0044] On the contrary, when the voltage at the DC power output terminal (VIN) of the door machine is within the normal range allowed by the door machine, the signal self-locking module 102 does not open the drive circuit, the voltage source Vref module does not form a power supply circuit, the voltage source Vref module does not work, there is no voltage difference between the two ends of the internal coil of the relay, the relay K1 does not operate, and the relay contacts are in a normally closed state, that is, the DC power output terminal (VIN) of the door machine and the power supply input terminal (VCC) of the door machine are connected, and the door machine product is powered normally.

[0045] The fifth resistor R5 acts as a voltage divider. When the overvoltage input voltage VIN is significantly greater than the output voltage Vref of the voltage source module, the fifth resistor R5 absorbs a portion of the voltage drop, reducing the voltage drop across the third transistor Q3 and thereby alleviating the power consumption of the third transistor Q3. The third diode D3 ensures that the signal latching module 102 has a unidirectional effect on the relay driver module 103, thereby enhancing the module's functional stability.

[0046] In this embodiment, the voltage reference chip U1 may be TL431BIDBZR, and the relay K1 may be HF115F / 024-1ZS3. Relevant personnel may adjust the chip model in the specific module according to actual usage.

[0047] In this embodiment, the rated supply voltage of the door operator can be 24V, the overvoltage protection point voltage can be designed to be 29V, and the voltage source circuit output voltage Vref can be designed to be 24V. The effective overvoltage input range for protection is 29V to 100V. Relevant personnel can modify the overvoltage protection point, the voltage source circuit output voltage Vref, and the relay model according to different door operator models.

[0048] The threshold voltage of the overvoltage protection point can be modified according to actual needs by modifying the parameters of the first resistor R1, the second resistor R2, and the voltage regulator diode D2 in the overvoltage detection module 101. The trigger sensitivity of the overvoltage protection can be adjusted by modifying the parameters of the second capacitor C2 and the third capacitor C3 in the signal self-locking module 102.

[0049] In summary, the overvoltage protection circuit of the present application enables the door operator to safely disconnect its power supply when the input power supply overvoltage occurs, protecting the door operator. The voltage at the overvoltage protection point can be adjusted according to specific needs. This circuit can be independently configured as a module and connected in series between the power supply and the door operator, making it easy to install and offering strong compatibility. It also utilizes relatively common components, including transistors, voltage regulator diodes, and relays, achieving stable functionality while achieving the desired function at a low cost.

[0050] In addition, an embodiment of the present application further provides an elevator, which may include one or more overvoltage protection circuits of the elevator DC door machine of any of the above embodiments.

[0051] It should be noted that the contents of the above-mentioned overvoltage protection circuit embodiment of the elevator DC door machine are applicable to the present elevator embodiment. The functions specifically implemented by the present elevator embodiment are the same as those of the above-mentioned overvoltage protection circuit embodiment of the elevator DC door machine, and the beneficial effects achieved are also the same as those achieved by the above-mentioned overvoltage protection circuit embodiment of the elevator DC door machine.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "switch" should be understood in a broad sense, for example, it can be a transformation or a conversion; for ordinary technicians in this field, the specific meaning of the above terms in the present invention can be understood according to specific circumstances.

[0053] In this specification, references to specific terms refer to specific structures or features described in conjunction with an embodiment or example as being included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0055] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. An overvoltage protection circuit for an elevator DC door machine, characterized in that: The circuit is set between the door machine DC power supply and the elevator door machine, and the circuit includes: Overvoltage detection module, signal self-locking module and relay drive module; The signal self-locking module and the door machine DC power supply are connected to the overvoltage detection module; the overvoltage detection module, the elevator door machine and the signal self-locking module are connected to the relay drive module.

2. The overvoltage protection circuit of the elevator DC door machine according to claim 1 is characterized in that: The signal self-locking module includes a fourth resistor, a second capacitor, a third capacitor, a first transistor and a second transistor; one end of the fourth resistor serves as the first input end of the signal self-locking module, the other end of the fourth resistor and one end of the third capacitor are connected to the emitter of the first transistor, the other end of the third capacitor and the collector of the second transistor are connected to the base of the first transistor, the collector of the first transistor and one end of the second capacitor are connected to the base of the second transistor, and the emitter of the second transistor and the other end of the second capacitor are both grounded; the base of the first transistor serves as the output end of the signal self-locking module, and the collector of the first transistor serves as the second input end of the signal self-locking module.

3. The overvoltage protection circuit of the elevator DC door machine according to claim 2, characterized in that: The first transistor is a PNP transistor; the second transistor is an NPN transistor.

4. The overvoltage protection circuit of the elevator DC door machine according to claim 1, characterized in that: The overvoltage detection module includes a first diode, a second diode, a first resistor, a second resistor, a third resistor and a first capacitor; the positive electrode of the first diode is connected to the input voltage, and the negative electrode of the first diode is connected to one end of the first resistor; the other end of the first resistor, one end of the first capacitor and one end of the second resistor are connected to the negative electrode of the second diode, one end of the third resistor is connected to the positive electrode of the second diode, and the other end of the third resistor, the other end of the second resistor and the other end of the first capacitor are all grounded; the positive electrode of the second diode serves as the first output end of the overvoltage detection module, the first output end of the overvoltage detection module is connected to the input end of the signal self-locking module, the negative electrode of the first diode serves as the second output end of the overvoltage detection module, and the second output end of the overvoltage detection module is connected to the relay drive module.

5. The overvoltage protection circuit of the elevator DC door machine according to claim 4, characterized in that: The second diode is a voltage stabilizing diode.

6. The overvoltage protection circuit of the elevator DC door machine according to claim 1, characterized in that: The relay driving module includes a voltage dividing unit, a power supply voltage stabilizing unit and a relay; the input end of the voltage dividing unit is connected to the overvoltage detection module, and the output end of the voltage dividing unit is connected to the power supply voltage stabilizing unit; the power supply voltage stabilizing unit is connected to the relay.

7. The overvoltage protection circuit of the elevator DC door machine according to claim 6, characterized in that: The power supply voltage stabilizing unit includes a third diode, a fourth diode, a sixth resistor, a third transistor, a voltage reference chip, a seventh resistor and an eighth resistor; the output end of the voltage divider unit, the first input end of the signal self-locking module and the collector of the third transistor are connected to one end of the sixth resistor; the other end of the sixth resistor and the base of the third transistor are connected to the cathode of the voltage reference chip; one end of the eighth resistor, the positive electrode of the third diode and the positive electrode of the fourth diode are connected to the anode of the voltage reference chip, and the negative electrode of the third diode and the negative electrode of the fourth diode are connected in parallel to the output end of the signal self-locking module; one end of the seventh resistor and the other end of the eighth resistor are connected to the reference end of the voltage reference chip; the other end of the seventh resistor is connected to the emitter of the third transistor.

8. The overvoltage protection circuit of the elevator DC door machine according to claim 7, characterized in that: The third transistor is an NPN transistor.

9. The overvoltage protection circuit of the elevator DC door machine according to claim 6, characterized in that: The voltage dividing unit includes one or more resistors; when the voltage dividing unit includes more than two resistors, any two of the more than two resistors are connected in series or any two of the more than two resistors are connected in parallel.

10. An elevator, characterized in that: The invention comprises an overvoltage protection circuit for an elevator DC door machine as described in any one of claims 1 to 9.

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