Escalator voltage stabilizing device

Abstract

The utility model discloses a voltage stabilizing device for an escalator. The voltage stabilizing device comprises a single-phase full-bridge inverter circuit I, a transformer, a single-phase full-bridge inverter circuit II, a capacitor, a voltage monitoring device and a driving device, a direct current side of the single-phase full-bridge inverter circuit is electrically connected with an escalator power supply input end; the alternating current side of the first single-phase full-bridge inverter circuit is electrically connected with the alternating current side of the second full-bridge inverter circuit through a transformer. The direct current side of the second full-bridge inverter circuit is connected with the capacitor. The voltage monitoring device is electrically connected with the escalator power input end. Compared with a voltage stabilizing device with a storage battery, the device adopts two single-phase full-bridge inverter circuits as main charging and discharging circuits, adopts a super capacitor as an energy storage element, is simple in circuit and has the characteristic of instantaneously absorbing and releasing large current; the charging and discharging times of the super capacitor can reach millions, the service life is longer, and the maintenance cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of escalators, in particular to a voltage stabilizing device for preventing an escalator from stopping due to a temporary voltage drop. Background Art

[0002] When the escalator is running, it is necessary to avoid the interference of voltage sag within 200ms, with the residual voltage being 40%-90%, otherwise the escalator will stop. In the existing technology, the escalator is prevented from stopping due to voltage sag by installing a third-party certified anti-voltage sag interference device (voltage stabilizer); the general voltage stabilizer stores energy through batteries, and when the escalator voltage fluctuates, the electric energy in the battery is inverted and supplied to the escalator control device to avoid the escalator stopping;

[0003] For example, the Chinese utility model patent with publication number CN214087268U discloses an escalator voltage fluctuation flash stop protection device, which is equipped with a voltage stabilizer, a battery, an inverter, a controller, etc. When the voltage fluctuates, the battery can be inverted by the inverter power supply to the host, the frequency converter and the control circuit for a short time to ensure that the escalator does not stop.

[0004] The above scheme uses batteries as energy storage elements to achieve short-term power supply for the escalator. However, after long-term charging and discharging, the performance of the batteries deteriorates, the service life is reduced, and regular maintenance and replacement are required, which increases the maintenance and use costs. Therefore, an automatic escalator voltage stabilizing device with a long service life and low maintenance and use costs is needed. Utility Model Content

[0005] Aiming at the problems of short service life and high maintenance cost of the automatic escalator voltage stabilizing device using batteries as energy storage elements in the prior art, the utility model provides an automatic escalator voltage stabilizing device with low maintenance cost and long service life.

[0006] An escalator voltage stabilizing device comprises: a single-phase full-bridge inverter circuit 1, a transformer, a single-phase full-bridge inverter circuit 2, a capacitor, a voltage monitoring device, and a driving device for driving the single-phase full-bridge inverter circuit 1 and the single-phase full-bridge inverter circuit 2; a filter capacitor is connected in parallel to a DC side of the single-phase full-bridge inverter circuit and then electrically connected to an escalator power supply input terminal; an AC side of the single-phase full-bridge inverter circuit 1 is electrically connected to an AC side of the full-bridge inverter circuit 2 through a transformer; and a DC side of the full-bridge inverter circuit 2 is connected to the capacitor;

[0007] The driving device is respectively connected to the single-phase full-bridge inverter circuit 1, the bridge inverter circuit 2, and the voltage monitoring device; the voltage monitoring device is electrically connected to the escalator power input terminal, and is used to monitor whether there is voltage sag interference at the escalator power input terminal, and output the monitoring result to the driving device.

[0008] Preferably, the single-phase full-bridge inverter circuit 1 and the single-phase full-bridge inverter circuit 2 each include four field effect transistors and four diodes.

[0009] Preferably, the driving device includes: an inverter driving module, which is electrically connected to the control electrodes of four field effect transistors in single-phase full-bridge inverter circuit one and single-phase full-bridge inverter circuit two through KA1-KA4 respectively; the voltage monitoring device is an electric power monitor, and the alarm output end of the electric power monitor is connected to the control ends of KA1-KA4 respectively.

[0010] Preferably, in order to facilitate recording of the operating data of the equipment, the alarm output terminal of the power monitor is also connected to a counter.

[0011] Preferably, the relays KA1-KA4 are single-pole double-throw power-off delay relays.

[0012] Preferably, the capacitor is a supercapacitor, which has the characteristics of instantaneously absorbing and releasing large currents, and can quickly and accurately stabilize the voltage of the escalator power supply.

[0013] Preferably, the driving device is a DSP module, and the voltage monitoring device adopts a voltage transmitter; the input end of the voltage transmitter is electrically connected to the escalator power input end, the output end of the voltage transmitter is connected to the DSP module, and the DSP module is respectively connected to the single-phase full-bridge inverter circuit 1 and the single-phase full-bridge inverter circuit 2.

[0014] Preferably, in order to protect the capacitor from being affected by reverse voltage, a diode is connected in parallel to the capacitor.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] (1) Compared with the voltage stabilizing device with a battery, this device uses two single-phase full-bridge inverter circuits as the main charging and discharging circuits and uses supercapacitors as energy storage elements. The circuit is not only simple, but also has the characteristics of instantaneous absorption and release of large currents. After a voltage drop occurs, the escalator power supply can be quickly and accurately stabilized. In addition, the supercapacitor can be charged and discharged up to millions of times, with a longer service life and lower maintenance costs.

[0017] (2) The volume and weight of capacitors are much lower than those of batteries. Therefore, the overall design size of the voltage stabilizing device is smaller, lighter, and easier to transport. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a circuit connection diagram of the first embodiment of an escalator voltage stabilizing device of the utility model;

[0019] Figure 2 This is a circuit connection diagram of a second embodiment of an escalator voltage stabilizing device of the utility model;

[0020] Figure 3 It is a circuit schematic diagram of a single-phase full-bridge inverter circuit 1, a transformer, a single-phase full-bridge inverter circuit 2 and a capacitor in Embodiment 1 and Embodiment 2. DETAILED DESCRIPTION

[0021] The following will be combined with the attached embodiment of the utility model Figure 1-3 ; Clearly and completely describe the technical solutions in the embodiments of the utility model:

[0022] Embodiment 1:

[0023] like Figure 1 As shown, in the first embodiment of the utility model, the escalator voltage stabilizing device includes: a single-phase full-bridge inverter circuit 2, a transformer 3, a single-phase full-bridge inverter circuit 4, a capacitor 5, and an inverter drive module 11 (EGS002); the DC side of the single-phase full-bridge inverter circuit 2 is connected in parallel with a filter capacitor 12 and then electrically connected to the escalator power input terminal 1; the AC side of the single-phase full-bridge inverter circuit 2 is electrically connected to the AC side of the full-bridge inverter circuit 4 through the transformer 3; the DC side of the full-bridge inverter circuit 4 is connected to the capacitor 5; in order to facilitate control, the single-phase full-bridge inverter circuit 2 and the single-phase full-bridge inverter circuit 4 are connected to the capacitor 5. The control electrodes of the four field effect transistors in the conversion circuit 2 4 are respectively connected to the four driving ends of the inverter drive module 11 through KA1-KA4; in order to timely monitor the voltage change of the escalator power input terminal 1, the escalator power input terminal 1 is electrically connected to the input end of the power monitor 9; the alarm output end of the power monitor 9 is respectively connected to the control ends of KA1-KA4; the alarm output end of the power monitor 9 is also connected to a counter 10, and the counter 10 counts the number of electrical signal actions of the alarm output end of the power monitor 9 to record the number of temporary voltage drops at the escalator power input terminal, so as to facilitate recording of the operation data of the equipment;

[0024] Specifically, the circuit schematic diagram of the single-phase full-bridge inverter circuit 1 2, the transformer 3, the single-phase full-bridge inverter circuit 2 4, and the capacitor 5 is as follows: Figure 3 As shown, the single-phase full-bridge inverter circuit 1 2 includes four field effect transistors Q3, Q4, Q7, and Q8 and four diodes D1, D2, D6, and D7; the single-phase full-bridge inverter circuit 2 4 includes four field effect transistors Q1, Q2, Q5, and Q6 and four diodes D3, D4, D8, and D9; the transformer 3 is Figure 3 T1 and capacitor 5 are Figure 3 UC PACKGE1 (160V, 5000Ah).

[0025] Among them, relay KA1-KA4 adopts a single-pole double-throw power-off delay relay, and the coil control end is connected to the alarm output end of the power monitor 9. The four PWM output ends of the inverter drive module 11 and the four field effect transistors Q1, Q2, Q5, and Q6 and the four field effect transistors Q3, Q4, Q7, and Q8 can be switched through the control coil to achieve driving the single-phase full-bridge inverter circuit 1 2 or the single-phase full-bridge inverter circuit 2 4 to work under different working conditions; in order to protect the capacitor 5 from being affected by the reverse voltage, a diode 6 is connected in parallel to the capacitor 5, that is, Figure 3 D5 in.

[0026] When working, under normal operating conditions, the alarm output terminal of the power monitor 9 is at a low level, the relay KA1-KA4 coils are powered off, and the four PWM output terminals (field effect tube drive terminals) of the inverter drive module 11 are respectively connected to the control electrodes of the four field effect tubes Q3, Q4, Q7, and Q8 in the single-phase full-bridge inverter circuit 12. The inverter drive module 11 drives the single-phase full-bridge inverter circuit 12 to work, inverts the DC power at the escalator power input terminal 1, transforms it through the transformer 3, and then rectifies it through the four diodes D3, D4, D8, and D9 to become a DC power supply to charge the capacitor 5;

[0027] When the power monitor 9 detects that the voltage at the escalator power input terminal has a temporary voltage drop, its alarm output terminal outputs a high-level signal, and the control relays KA1-KA4 connect the four PWM output terminals (field effect tube drive terminals) of the inverter drive module 11 to the control electrodes of the four field effect tubes Q1, Q2, Q5, and Q6 in the single-phase full-bridge inverter circuit 2 4 respectively; at this time, the single-phase full-bridge inverter circuit 2 4 works, and the electric energy stored in the capacitor 5 is inverted, and then transformed by the transformer 3, and then rectified by the four diodes D1, D2, D6, and D7 in the single-phase full-bridge inverter circuit 2 to output a DC voltage, which is filtered by the filter capacitor 12 and supplied to the escalator power input terminal 1 to short-term compensate the escalator control circuit; when the voltage at the escalator power input terminal 1 returns to normal, , the alarm output end of the power monitor 9 is restored to a low level. After the relay KA1-KA4 coil receives the signal from the alarm output end of the power monitor 9, the coil is powered off. After a delay (to ensure that the capacitor 5 fully releases the electric energy and successfully survives the voltage sag interference), the four PWM output ends (field effect transistor drive ends) of the inverter drive module 11 are respectively connected to the control electrodes of the four field effect transistors Q3, Q4, Q7, and Q8 in the single-phase full-bridge inverter circuit 1-2. The inverter drive module 11 drives the single-phase full-bridge inverter circuit 1-2 to work, inverts the DC power at the escalator power input end 1, transforms it through the transformer 3, and then rectifies it through the four diodes D3, D4, D8, and D9 to become a DC power supply to charge the capacitor 5, preparing for the next voltage sag interference.

[0028] Embodiment 2:

[0029] like Figure 2 As shown, in the second embodiment of the utility model, the escalator voltage stabilizing device comprises: a single-phase full-bridge inverter circuit 1 2, a transformer 3, a single-phase full-bridge inverter circuit 2 4, and a capacitor 5;

[0030] Different from the first embodiment, the power monitor 9 is replaced by a voltage transmitter 8, and the inverter drive module 11, the counter 10, and the relays KA1-KA4 are replaced by a DSP module 7; the input end of the voltage transmitter 8 is electrically connected to the escalator power input end 1, and the output end of the voltage transmitter 8 is connected to the DSP module 7, and the DSP module 7 (TMS32) outputs two groups of PWM waves (four channels in each group) to drive the single-phase full-bridge inverter circuit 1 2 and the single-phase full-bridge inverter circuit 2 4 to work respectively;

[0031] During operation, when the voltage transmitter 8 detects that the voltage at the escalator power input terminal has a voltage sag, the DSP module 7 collects the output change of the voltage transmitter 8, controls the single-phase full-bridge inverter circuit 2 4 to work, and inverts the electric energy stored in the capacitor 5, transforms it through the transformer 3, and then rectifies it through the four diodes D1, D2, D6, and D7 in the single-phase full-bridge inverter circuit 2 to output a DC voltage, which is filtered by the filter capacitor 12 and supplied to the escalator power input terminal 1 to short-term compensate the escalator control circuit; when the voltage at the escalator power input terminal 1 returns to normal, the output end of the voltage transmitter 8 is restored, and the DSP module 7 only drives the single-phase full-bridge inverter circuit 2 to work, inverts the DC power at the escalator power input terminal 1, transforms it through the transformer 3, and then rectifies it through the four diodes D3, D4, D8, and D9 to become a DC power supply to charge the capacitor 5, preparing for the next voltage sag interference.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention based on the technical solution and improved concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An escalator voltage stabilizing device, characterized in that: include: A single-phase full-bridge inverter circuit 1, a transformer, a single-phase full-bridge inverter circuit 2, a capacitor, a voltage monitoring device, and a driving device for driving the single-phase full-bridge inverter circuit 1 and the single-phase full-bridge inverter circuit 2; the single-phase full-bridge inverter circuit is electrically connected to the escalator power supply input terminal after a DC side parallel filter capacitor is connected; the AC side of the single-phase full-bridge inverter circuit 1 is electrically connected to the AC side of the full-bridge inverter circuit 2 through a transformer; the DC side of the full-bridge inverter circuit 2 is connected to the capacitor; the driving device is respectively connected to the single-phase full-bridge inverter circuit 1, the bridge inverter circuit 2, and the voltage monitoring device; the voltage monitoring device is electrically connected to the escalator power supply input terminal.

2. The escalator voltage stabilizing device according to claim 1, characterized in that: The single-phase full-bridge inverter circuit 1 and the single-phase full-bridge inverter circuit 2 both include four field effect tubes and four diodes.

3. The escalator voltage stabilizing device according to claim 2, characterized in that: The driving device includes: an inverter driving module, which is electrically connected to the control electrodes of four field effect transistors in single-phase full-bridge inverter circuit one and single-phase full-bridge inverter circuit two through KA1-KA4 respectively; the voltage monitoring device is an electric power monitor, and the alarm output end of the electric power monitor is connected to the control end of KA1-KA4 respectively.

4. The escalator voltage stabilizing device according to claim 3, characterized in that: The alarm output terminal of the power monitor is also connected to a counter.

5. An escalator voltage stabilizing device according to claim 3 or 4, characterized in that: The relays KA1-KA4 are single-pole double-throw power-off delay relays.

6. The escalator voltage stabilizing device according to claim 1, characterized in that: The driving device is a DSP module, and the voltage monitoring device adopts a voltage transmitter; the input end of the voltage transmitter is electrically connected to the escalator power input end, the output end of the voltage transmitter is connected to the DSP module, and the DSP module is respectively connected to the single-phase full-bridge inverter circuit 1 and the single-phase full-bridge inverter circuit 2.

7. The escalator voltage stabilizing device according to claim 1, characterized in that: A diode is connected in parallel to the capacitor.

8. The escalator voltage stabilizing device according to claim 1, characterized in that: The capacitor is a supercapacitor.

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