CN210041323U - Lightning surge protection circuit of elevator door motor - Google Patents
Lightning surge protection circuit of elevator door motor Download PDFInfo
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- CN210041323U CN210041323U CN201921206904.4U CN201921206904U CN210041323U CN 210041323 U CN210041323 U CN 210041323U CN 201921206904 U CN201921206904 U CN 201921206904U CN 210041323 U CN210041323 U CN 210041323U
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Abstract
The utility model relates to a thunderbolt surge protection field especially relates to a thunderbolt surge protection circuit of elevator door machine, its characterized in that: the protection circuit is electrically connected between the power supply and the elevator door motor and comprises a primary protection unit and a secondary protection unit; the primary protection unit comprises a first voltage dependent resistor, a second voltage dependent resistor, a third voltage dependent resistor and a TVS tube unit; the first voltage dependent resistor is respectively connected with the live wire and the zero wire, the second voltage dependent resistor is connected with the live wire and connected with the TVS tube unit, the third voltage dependent resistor is connected with the zero wire and connected with the TVS tube unit, and the TVS tube unit is grounded; the secondary protection unit comprises a first voltage stabilizing diode and a second voltage stabilizing diode, the anode of the first voltage stabilizing diode is connected to the anode of the second voltage stabilizing diode, the cathode of the first voltage stabilizing diode is connected to the live wire, the cathode of the second voltage stabilizing diode is connected to the zero line, and the middle node of the first voltage stabilizing diode and the middle node of the second voltage stabilizing diode are grounded. The utility model discloses the surge protecting effect is good, and the reliability is high.
Description
Technical Field
The utility model relates to a thunderbolt surge protection field especially relates to a thunderbolt surge protection circuit of elevator door machine.
Background
Surge voltage refers to transient overvoltage exceeding the theoretical operating voltage range, and causes that may cause surge are divided into external causes and internal causes: the main external cause is overvoltage caused by lightning or public power grid switching operation, and most of electric equipment damage is related to the overvoltage; internal causes refer to surges of inductive loads inside the building;
the surge is mainly caused by two aspects, on one hand, the surge is an overvoltage pulse generated at the moment of power supply connection, and the overvoltage pulse can generate a spike pulse higher than the power supply due to the nonlinearity of an internal circuit of a door machine controller; on the other hand, due to the fact that external sharp pulse interference is introduced by the on-off operation of an external large load, the circuit is likely to be burnt out at the moment of surge due to the pulse;
the elevator surge phenomenon is a voltage and current instantaneous rising phenomenon which is often encountered in the switching process of an elevator electrical system and the switching process of a contactor, the output end of a frequency converter and the thunder and lightning environment; the situation that the elevator cannot normally run due to the influence of surge phenomenon every year is many;
at present, in an application scene of an elevator, a main power supply input end of an elevator control cabinet and an input end of a frequency converter have no surge impact prevention measure; the protection grounding of the elevator is poor, and many designed grounding points (such as a control cabinet, a door machine and door machine control system, a metal shielding position and the like) have the grounding poor condition similar to the wiring grounding after insulating paint is sprayed; therefore, when the elevator is influenced by large current impact, static electricity or large electromagnetic field, the control system fails, and even the electric elements are burnt.
Disclosure of Invention
The utility model aims at providing a lightning stroke surge protection circuit of elevator door machine, the surge protecting effect is good, and the reliability is high.
For solving the above technical problem, the technical scheme of the utility model is that: a lightning surge protection circuit of an elevator door motor is electrically connected between a power supply and the elevator door motor and comprises a primary protection unit and a secondary protection unit;
the primary protection unit comprises a first voltage dependent resistor, a second voltage dependent resistor, a third voltage dependent resistor and a TVS tube unit; the first voltage dependent resistor is respectively connected with the live wire and the zero wire, the second voltage dependent resistor is connected with the live wire and connected with the TVS tube unit, the third voltage dependent resistor is connected with the zero wire and connected with the TVS tube unit, and the TVS tube unit is grounded;
the secondary protection unit comprises a first voltage stabilizing diode and a second voltage stabilizing diode, the anode of the first voltage stabilizing diode is connected to the anode of the second voltage stabilizing diode, the cathode of the first voltage stabilizing diode is connected to the live wire, the cathode of the second voltage stabilizing diode is connected to the zero line, and the middle node of the first voltage stabilizing diode and the middle node of the second voltage stabilizing diode are grounded.
According to the scheme, the protection circuit further comprises a fuse arranged on a live wire, and the fuse is used for disconnecting the circuit and protecting the device when the first voltage dependent resistor VR1 is short-circuited and fails.
According to the scheme, the TVS tube unit comprises at least one TVS tube.
According to the scheme, the number of the TVS tubes is multiple, and the TVS tubes are connected in series; the withstand voltage value of the surge protection circuit can be improved by connecting a plurality of TVS tubes in series.
According to the scheme, the number of the TVS tubes is multiple, and the TVS tubes are connected in parallel; the current bearing capacity of the surge protection circuit can be improved by connecting a plurality of TVS tubes in parallel.
The utility model discloses following beneficial effect has: the utility model adopts two-stage protection, the first voltage dependent resistor is adopted in the first-stage protection unit to protect differential mode surge, the second voltage dependent resistor and the third voltage dependent resistor are adopted in the second-stage protection unit to be connected with the TVS tube in series and then to be grounded, and the structure adopting the voltage dependent resistor and the TVS tube to be connected in series has the advantages of small leakage current and high reliability; the secondary protection unit adopts a bidirectional PESD series connection method for the voltage stabilizing diode, so that the performance of a lightning protection system of the elevator is enhanced, and the related detection standard of electromagnetic compatibility is met; the utility model discloses a two-stage protection unit surge protecting effect good, the reliability is high.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a third embodiment of the present invention;
reference numerals: 1. a primary protection unit; 101. a TVS tube unit; 2. a secondary protection unit; 3. and a fuse.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
According to the principle of surge generation, the surge suppression element has the function of discharging the generated instantaneous high-voltage energy to avoid that the high voltage enters the rear stage of a power supply to influence sensitive components, and the surge suppression device has similar working principle although the protection voltage ranges are different, namely when the voltage at two ends of the device is lower than the protection voltage, the device is in a high-resistance state, and the flowing current is small; however, once the voltage at the two ends of the device is higher than the protection voltage, the flowing current rises sharply, so that the voltage suppression effect is realized, and the voltage at the two ends of the device is maintained at the protection voltage; the surge protection mainly considers the suppression of the surge in a power supply in a controller, mainly utilizes a nonlinear component to suppress high-frequency surge, and the nonlinear component for the surge suppression mainly comprises a piezoresistor and a TVS (transient voltage suppressor).
Fig. 1 shows a first embodiment of the present invention, which is a lightning surge protection circuit of an elevator door motor, the protection circuit is electrically connected between a power supply input end and an elevator door motor module; the protection circuit is electrically connected between the power supply and the elevator door motor and comprises a primary protection unit 1 and a secondary protection unit 2;
the primary protection unit 1 comprises a first voltage dependent resistor VR1, a second voltage dependent resistor VR2, a third voltage dependent resistor VR3 and a TVS tube unit 101; two ends of a first voltage dependent resistor VR1 are respectively connected with a live line AC-L and a zero line AC-N to clamp the voltage between the live line AC-L and the zero line AC-N; the second voltage dependent resistor VR2 is connected with the live line AC-L and connected with the TVS tube unit 101, the third voltage dependent resistor VR3 is connected with the neutral line AC-N and connected with the TVS tube unit 101, and the TVS tube unit 101 is grounded; a fuse 3 is connected in series with a live wire AC-L at the front end of the first piezoresistor VR1, and when the first piezoresistor VR1 is short-circuited and fails, the circuit is disconnected to protect the device; second piezo-resistor VR2 and third piezo-resistor VR3 and TVS pipe unit 101 ground connection after establishing ties, second piezo-resistor VR2 and third piezo-resistor VR3 are used for releasing the surge current of a part on live wire and the zero line, pass through the TVS pipe at last, release a large amount of energy to ground, protect the important circuit in rear end, TVS pipe unit 101 includes a TVS pipe, adopt the protection of TVS pipe, respond to surge voltage in the time span that is less than the nanosecond, have accurate conduction, high sensitivity, surge absorbing capacity is strong, characteristics such as reliability height.
The secondary protection unit 2 comprises a first zener diode ZD1 and a second zener diode ZD2, the anode of the first zener diode ZD1 is connected to the anode of the second zener diode ZD2, the cathode of the first zener diode ZD1 is connected to the live line AC-L, the cathode of the second zener diode ZD2 is connected to the neutral line AC-N, wherein the middle node PE of the first zener diode ZD1 and the second zener diode ZD2 is grounded; the Zener diode is a common ESD device with Zener characteristics, and the second-stage protection unit 2 is PESD series based on Zener diode, wherein the first Zener diode ZD1The reverse end of the transformer is connected with a live wire AC-L of a protected line, and the forward end of the transformer is grounded and used for discharging forward instantaneous high-voltage pulse; second zener diode ZD2The reverse end of the transformer is connected with a zero line AC-N of a protected line, and the positive end of the transformer is grounded and used for releasing negative instantaneous high-voltage pulse; when instantaneous high-voltage pulse enters the line, the positive pulse passes through a live wire AC-L and a first voltage-stabilizing diode ZD1The ground PE is discharged, and negative pulses pass through a zero line AC-N and a second voltage stabilizing diode ZD2The circuit with ground PE is drained.
Fig. 2 shows the utility model discloses the second kind of embodiment, the second kind of embodiment is different from above-mentioned first kind of embodiment in TVS pipe unit 101, TVS pipe unit 101 includes a plurality of series connection's TVS pipe, TVS pipe quantity in this embodiment is 3, 3 TVS pipe series connection, a plurality of TVS pipes of series connection can improve surge protection circuit's withstand voltage, improve the reliability of surge protection.
Fig. 3 shows the utility model discloses the third embodiment, and the third embodiment is different from above-mentioned first embodiment in TVS pipe unit 101, and TVS pipe unit 101 includes a plurality of parallel connection's TVS pipe, and TVS pipe quantity in this embodiment is 3, 3 TVS pipe parallel connection, and a plurality of TVS pipes in parallel connection can improve surge protection circuit's current carrying capacity, improves the reliability of surge protection.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (5)
1. The utility model provides a thunderbolt surge protection circuit of elevator door machine which characterized in that: the protection circuit is electrically connected between a power supply and an elevator door motor and comprises a primary protection unit (1) and a secondary protection unit (2);
the primary protection unit (1) comprises a first piezoresistor, a second piezoresistor, a third piezoresistor and a TVS tube unit (101); the first voltage dependent resistor is respectively connected with a live wire and a zero wire, the second voltage dependent resistor is connected with the live wire and is connected with the TVS tube unit (101), the third voltage dependent resistor is connected with the zero wire and is connected with the TVS tube unit (101), and the TVS tube unit (101) is grounded;
the secondary protection unit (2) comprises a first voltage-stabilizing diode and a second voltage-stabilizing diode, the anode of the first voltage-stabilizing diode is connected to the anode of the second voltage-stabilizing diode, the cathode of the first voltage-stabilizing diode is connected to the live wire, the cathode of the second voltage-stabilizing diode is connected to the zero line, and the middle node of the first voltage-stabilizing diode and the middle node of the second voltage-stabilizing diode are grounded.
2. The elevator door motor lightning surge protection circuit according to claim 1, characterized in that: the protection circuit further comprises a fuse (3) arranged on the live wire.
3. The elevator door motor lightning surge protection circuit according to claim 1, characterized in that: the TVS tube unit (101) includes at least one TVS tube.
4. The elevator door motor lightning surge protection circuit according to claim 3, characterized in that: the quantity of TVS pipe is a plurality of, and a plurality of TVS pipes are connected in series.
5. The elevator door motor lightning surge protection circuit according to claim 3, characterized in that: the quantity of TVS pipe is a plurality of, a plurality of TVS pipe parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921206904.4U CN210041323U (en) | 2019-07-29 | 2019-07-29 | Lightning surge protection circuit of elevator door motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921206904.4U CN210041323U (en) | 2019-07-29 | 2019-07-29 | Lightning surge protection circuit of elevator door motor |
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| Publication Number | Publication Date |
|---|---|
| CN210041323U true CN210041323U (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921206904.4U Active CN210041323U (en) | 2019-07-29 | 2019-07-29 | Lightning surge protection circuit of elevator door motor |
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| CN (1) | CN210041323U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299703A (en) * | 2019-07-29 | 2019-10-01 | 南京市特种设备安全监督检验研究院 | A kind of lightning surge protection circuit of elevator door-motor |
-
2019
- 2019-07-29 CN CN201921206904.4U patent/CN210041323U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299703A (en) * | 2019-07-29 | 2019-10-01 | 南京市特种设备安全监督检验研究院 | A kind of lightning surge protection circuit of elevator door-motor |
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