Reverse connection prevention circuit of elevator energy feedback unit

Abstract

The utility model relates to an anti-reverse-connection circuit of an elevator energy feedback unit. The anti-reverse-connection circuit comprises a proportional operation circuit, a comparison circuit, an isolation circuit and a driving circuit, an input port of the proportional operation circuit is respectively connected to a positive bus DC + and a negative bus DC-in of the frequency converter, an input port of the comparison circuit is connected with an output port of the proportional operation circuit, an input port of the isolation circuit is connected with an output port of the comparison circuit, an input port of the driving circuit is connected with an output port of the isolation circuit, and an output port of the driving circuit is connected with a relay K1. And a group of normally open main contacts of the relay K1 are connected between the negative bus DC-in and the negative bus DC-out. The anti-reverse-connection circuit of the elevator energy feedback unit is simple, high in reliability and high in cost performance and can be directly integrated in an elevator energy feedback unit device, and field installation and use are simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator control, in particular to an anti-reverse connection circuit of an elevator energy feedback unit. Background Art

[0002] As people's living standards continue to improve and science and technology continue to develop, energy consumption has increased, the contradiction between electricity supply and demand has become increasingly prominent, and energy conservation and emission reduction have become an important issue in social development. Relevant statistics show that the energy consumption of elevators accounts for more than 15% of the overall energy consumption of a building. If this part of the loss can be used effectively and environmentally friendly, it can effectively reduce energy consumption and save the operating costs of the building.

[0003] By installing an elevator energy feedback unit, the excess electrical energy generated during elevator operation can be converted into AC electrical energy and fed back to the power grid. It can then be provided to other electrical equipment such as community lighting systems, air conditioning, and water supply systems, effectively achieving the dual goals of energy conservation and emission reduction and cost savings.

[0004] When installing an elevator energy feedback unit, the positive and negative busbars of the elevator energy feedback unit need to be connected to the positive and negative busbars of the inverter, and there are polarity requirements when connecting. Pay special attention when wiring. If the positive and negative are connected in reverse, the inverter or elevator energy feedback unit may be damaged. Utility Model Content

[0005] The utility model aims to solve the deficiencies of the prior art and provides an anti-reverse connection circuit for an elevator energy feedback unit, which can effectively prevent equipment damage when the positive and negative busbars of the elevator energy feedback unit and the positive and negative busbars of the inverter are reversely connected.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] An anti-reverse connection circuit for an elevator energy feedback unit comprises a proportional operation circuit, a comparison circuit, an isolation circuit and a drive circuit;

[0008] The input ports of the proportional operation circuit are respectively connected to the positive bus DC+ and the negative bus DC-in of the inverter, the input port of the comparison circuit is connected to the output port of the proportional operation circuit, the input port of the isolation circuit is connected to the output port of the comparison circuit, the input port of the drive circuit is connected to the output port of the isolation circuit, the output port of the drive circuit is connected to the relay K1, and a group of normally open main contacts of the relay K1 are connected between the negative bus DC-in and DC-out.

[0009] The proportional operation circuit includes proportional resistors R1-R10, a ground resistor R11, an operational amplifier chip U1 and a filter capacitor C1;

[0010] The negative busbar DC-in of the frequency converter is connected to the negative-phase input port 2 of the operational amplifier chip U1 after being serially connected with resistors R1, R3, R5, and R7. The positive busbar DC+ of the frequency converter is connected to the positive-phase input port 3 of the operational amplifier chip U1 after being serially connected with resistors R2, R4, R6, and R8. A digital ground wire is connected between resistor R8 and the positive-phase input port 3 of the operational amplifier chip U1 through resistor R9. The output port 1 of the operational amplifier chip U1 is connected to the output signal Vdc. A resistor R10 is connected in parallel between the negative-phase input port 2 and the output port 1 of the operational amplifier chip U1. The filter capacitor C1 and the resistor R11 to the ground are located at the rear end of the output port 1 of the operational amplifier chip U1. After being connected in parallel, the filter capacitor C1 and the resistor R11 to the ground are connected to the digital ground wire. The operational amplifier chip U1 is powered by +15V and -15V.

[0011] The comparison circuit includes resistors R12, R13, R14, and comparator U2;

[0012] Resistors R13 and R14 divide the voltage to generate a reference voltage, which is connected to the negative-phase input port 2 of the comparator U2. The output signal Vdc of the proportional operation circuit is connected to the positive-phase input port 3 of the comparator U2. The output port 1 of the comparator U2 is connected to the output signal Vcom. A resistor R12 is connected between the positive-phase input port 3 and the output port 1 of the comparator U2. The comparator U2 is powered by +15V and grounded.

[0013] The isolation circuit includes resistors R15, R16, capacitor C2, and optocoupler U3;

[0014] Port 1 of the optocoupler U3 is connected to the output signal Vcom of the comparison circuit. Port 2 of the optocoupler U3 is grounded. Port 3 of the optocoupler U3 is connected to the output signal Driver. Port 4 of the optocoupler U3 is connected to VCC24V. Resistors R16 and capacitor C2 are connected in parallel between the input line of port 1 of the optocoupler U3 and the ground wire of port 2 of the optocoupler U3. Resistor R15 is connected between the input line of port 1 of the optocoupler U3 and +15V.

[0015] The drive circuit includes resistors R17, R18, triode Q1, and relay K1;

[0016] The output signal Driver of the isolation circuit is connected to port 1 of the triode Q1 after being serially connected with resistor R17. Port 2 of the triode Q1 is grounded. A resistor R18 is provided between port 1 and the ground wire of port 2 of the triode Q1. Port 3 of the triode Q1 is connected to the relay K1. A set of normally open main contacts of the relay K1 is directly connected between the negative busbar DC-in and DC-out. The relay K1 is connected to VCC24V.

[0017] If the wiring sequence is correct, the output Vdc of the proportional operation circuit is a positive voltage. If it is reversely connected, the output Vdc of the proportional operation circuit is a negative voltage. If the output Vdc of the proportional operation circuit is a positive voltage, the output Vcom of the comparison circuit is in a high-impedance state. If the output Vdc of the proportional operation circuit is a negative voltage, the output Vcom of the comparison circuit is at a low level. If the output Vcom of the comparison circuit is in a high-impedance state, the optocoupler U3 will conduct, and the output Driver of the isolation circuit is at a high level of 24V. If the output Vcom of the comparison circuit is at a low level, the output Driver of the isolation circuit is in a high-impedance state. If the output Driver of the isolation circuit is at a high level of 24V, the triode Q1 conducts, the relay K1 is attracted, the negative bus voltage loop conducts, DC-in and DC-out conduct, and the elevator energy feedback unit is normally powered and operates. If the output Driver of the isolation circuit is in a high-impedance state, the negative bus voltage loop will be disconnected, thereby protecting the elevator energy feedback unit device from damage.

[0018] The beneficial effects of the present utility model are as follows: An anti-reverse connection circuit for an elevator energy feedback unit provided by the present utility model has a simple circuit, strong reliability, high cost performance, and can be directly integrated into the elevator energy feedback unit device, simplifying the on-site installation and use. Brief Description of the Drawings

[0019] Figure 1 The main circuit block diagram of the anti-reverse connection circuit for the elevator energy feedback unit of the present utility model;

[0020] Figure 2 The circuit diagram of the proportional operation circuit of the present utility model;

[0021] Figure 3 The circuit diagram of the comparison circuit of the present utility model;

[0022] Figure 4 The circuit diagram of the isolation circuit of the present utility model;

[0023] Figure 5 The circuit diagram of the drive circuit of the present utility model.

[0024] Hereinafter, embodiments of the present utility model will be described in detail with reference to the accompanying drawings. Detailed Embodiments

[0025] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model. In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the accompanying drawings. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model herein are for the purpose of describing specific embodiments only and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] The following further describes this utility model in conjunction with the accompanying drawings and embodiments:

[0028] An anti-reverse connection circuit for an elevator energy feedback unit, as Figure 1 shown, includes a proportional operation circuit, a comparison circuit, an isolation circuit, and a drive circuit.

[0029] The input ports of the proportional operation circuit are respectively connected to the positive bus DC+ and the negative bus DC-in of the frequency converter. The input port of the comparison circuit is connected to the output port of the proportional operation circuit. The input port of the isolation circuit is connected to the output port of the comparison circuit. The input port of the drive circuit is connected to the output port of the isolation circuit. The output port of the drive circuit is connected to a relay K1, and a set of normally open main contacts of the relay K1 are connected between the negative bus DC-in and DC-out.

[0030] The proportional operation circuit, as Figure 2 shown, includes proportional resistors R1 - R10, a ground resistor R11, an operational amplifier chip U1, and a filter capacitor C1.

[0031] The negative bus DC-in of the frequency converter is connected in series with resistors R1, R3, R5, and R7 and then connected to the negative-phase input port 2 of the operational amplifier chip U1. The positive bus DC+ of the frequency converter is connected in series with resistors R2, R4, R6, and R8 and then connected to the positive-phase input port 3 of the operational amplifier chip U1. A digital ground wire is connected between the resistor R8 and the positive-phase input port 3 of the operational amplifier chip U1 through a resistor R9. The output port 1 of the operational amplifier chip U1 is connected to an output signal Vdc. A resistor R10 is connected in parallel between the negative-phase input port 2 and the output port 1 of the operational amplifier chip U1. The filter capacitor C1 and the ground resistor R11 are located at the rear end of the output port 1 of the operational amplifier chip U1. The filter capacitor C1 and the ground resistor R11 are connected in parallel and then connected to the digital ground wire. The operational amplifier chip U1 is powered by +15V and -15V.

[0032] The input ports of the proportional operation circuit are connected to the positive and negative buses DC+ and DC-in of the frequency converter, and after being reduced by a certain proportion through resistors R1 - 10, an output signal Vdc is output.

[0033] The operational amplifier chip U1 is powered by +15V and -15V and can output without distortion. When a negative voltage is input due to reverse connection of the positive and negative buses, it can also ensure that the output signal Vdc is a negative voltage.

[0034] The comparison circuit is as follows Figure 3 shown, and includes resistor R12, resistor R13, resistor R14, and comparator U2.

[0035] Resistors R13 and R14 divide the voltage to generate a reference voltage, which is connected to the negative-phase input port 2 of comparator U2. The output signal Vdc of the proportional operation circuit is connected to the positive-phase input port 3 of comparator U2. The output port 1 of comparator U2 is connected to the output signal Vcom. A resistor R12 is connected between the positive-phase input port 3 and the output port 1 of comparator U2. Comparator U2 is powered by +15V and grounded.

[0036] Resistor R12 has a hysteresis effect and can effectively suppress noise and interference in the input signal.

[0037] The isolation circuit is as follows Figure 4 shown, and includes resistor R15, resistor R16, capacitor C2, and optocoupler U3.

[0038] Port 1 of optocoupler U3 is connected to the output signal Vcom of the comparison circuit. Port 2 of optocoupler U3 is grounded. Port 3 of optocoupler U3 is connected to the output signal Driver. Port 4 of optocoupler U3 is connected to VCC24V. Resistors R16 and capacitor C2 are connected in parallel between the input line of port 1 and the ground wire of port 2 of optocoupler U3. Resistor R15 is connected between the input line of port 1 of optocoupler U3 and +15V.

[0039] Optocoupler U3 plays an isolation role, enabling complete electrical isolation between the input end and the output end, with strong anti-interference ability and improving the stability of the circuit.

[0040] The drive circuit is as follows Figure 5 shown, and includes resistor R17, resistor R18, triode Q1, and relay K1.

[0041] The output signal Driver of the isolation circuit is connected to port 1 of triode Q1 after being in series with resistor R17. Port 2 of triode Q1 is grounded. A resistor R18 is provided between port 1 and the ground wire of port 2 of triode Q1. Port 3 of triode Q1 is connected to relay K1. A set of normally open main contacts of relay K1 is directly connected between the negative bus DC-in and DC-out. Relay K1 is connected to VCC24V.

[0042] Among them, triode Q1 plays a switching control role, increasing the drive ability of the circuit and providing sufficient current for the coil of relay K1 to attract. A set of normally open main contacts of relay K1 is directly connected to the negative bus DC-in and DC-out. When relay K1 attracts, it ensures that sufficient working current is provided for the subsequent energy feedback unit.

[0043] The signal sampling ports of the proportional operation circuit are connected to the positive and negative bus voltages DC+ and DC-in of the frequency converter. If the wiring sequence is correct, the output Vdc of the proportional operation circuit is a positive voltage. If it is reversely connected, the output Vdc of the proportional operation circuit is a negative voltage.

[0044] If the output Vdc of the proportional operation circuit is a positive voltage, the output Vcom of the comparison circuit is in a high-impedance state. If the output Vdc of the proportional operation circuit is a negative voltage, the output Vcom of the comparison circuit is at a low level.

[0045] If the output Vcom of the comparison circuit is in a high-impedance state, the optocoupler U3 will conduct, and the output Driver of the isolation circuit is at a high level of 24V. If the output Vcom of the comparison circuit is at a low level, the output Driver of the isolation circuit is in a high-impedance state.

[0046] If the output Driver of the isolation circuit is at a high level of 24V, the triode Q1 conducts, the relay K1 is attracted, the negative bus voltage loop conducts, DC-in and DC-out conduct, and the elevator energy feedback unit is powered and operates normally. If the output Driver of the isolation circuit is in a high-impedance state, the negative bus voltage loop will be disconnected, thereby protecting the elevator energy feedback unit device from damage.

[0047] An anti-reverse connection circuit for an elevator energy feedback unit provided by the present utility model has a simple circuit, strong reliability, and high cost performance. It can be directly integrated into the elevator energy feedback unit device, simplifying the on-site installation and use.

[0048] The above has made an exemplary description of the present utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present utility model, or directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. An anti-reverse connection circuit for an elevator energy feedback unit, characterized in that: It includes a proportional operation circuit, a comparison circuit, an isolation circuit and a driving circuit; The input ports of the proportional operation circuit are respectively connected to the positive bus DC+ and the negative bus DC-in of the inverter, the input port of the comparison circuit is connected to the output port of the proportional operation circuit, the input port of the isolation circuit is connected to the output port of the comparison circuit, the input port of the drive circuit is connected to the output port of the isolation circuit, the output port of the drive circuit is connected to the relay K1, and a group of normally open main contacts of the relay K1 are connected between the negative bus DC-in and DC-out.

2. The elevator energy feedback unit anti-reverse connection circuit according to claim 1, characterized in that: The proportional operation circuit includes proportional resistors R1-R10, a ground resistor R11, an operational amplifier chip U1 and a filter capacitor C1; The negative bus DC-in of the inverter is connected in series with resistors R1, R3, R5 and R7, and then connected to the negative phase input port 2 of the operational amplifier chip U1. The positive bus DC+ of the inverter is connected in series with resistors R2, R4, R6 and R8, and then connected to the positive phase input port 3 of the operational amplifier chip U1. The digital ground is connected between resistor R8 and the positive phase input port 3 of the operational amplifier chip U1 through resistor R9. The output port 1 of the operational amplifier chip U1 is connected to the output signal Vdc. A resistor R10 is connected in parallel between the negative phase input port 2 and the output port 1 of the operational amplifier chip U1. The filter capacitor C1 and the ground resistor R11 are located at the rear end of the output port 1 of the operational amplifier chip U1. The filter capacitor C1 and the ground resistor R11 are connected in parallel to the digital ground. The operational amplifier chip U1 is powered by positive 15V and negative 15V.

3. The elevator energy feedback unit anti-reverse connection circuit according to claim 2, characterized in that: The comparison circuit includes a resistor R12, a resistor R13, a resistor R14 and a comparator U2; Resistors R13 and R14 divide the voltage to generate a reference voltage, which is connected to the negative input port 2 of the comparator U2. The output signal Vdc of the proportional operation circuit is connected to the positive input port 3 of the comparator U2. The output port 1 of the comparator U2 is connected to the output signal Vcom. Resistor R12 is connected between the positive input port 3 and the output port 1 of the comparator U2. The comparator U2 is powered by positive 15V and ground.

4. The elevator energy feedback unit anti-reverse connection circuit according to claim 3, characterized in that: The isolation circuit includes a resistor R15, a resistor R16, a capacitor C2 and an optical coupler U3; Port 1 of the optocoupler U3 is connected to the output signal Vcom of the comparison circuit, port 2 of the optocoupler U3 is grounded, port 3 of the optocoupler U3 is connected to the output signal Driver, and port 4 of the optocoupler U3 is connected to VCC24V; resistor R16 and capacitor C2 are connected in parallel between the input line of port 1 of the optocoupler U3 and the ground line of port 2 of the optocoupler U3, and resistor R15 is connected between the input line of port 1 of the optocoupler U3 and positive 15V.

5. The elevator energy feedback unit anti-reverse connection circuit according to claim 4, characterized in that: The driving circuit includes a resistor R17, a resistor R18, a transistor Q1 and a relay K1; The output signal Driver of the isolation circuit is connected to port 1 of transistor Q1 after being connected to resistor R17 in series. Port 2 of transistor Q1 is grounded. Resistor R18 is provided between the ground wires of ports 1 and 2 of transistor Q1. Port 3 of transistor Q1 is connected to relay K1. A set of normally open main contacts of relay K1 is directly connected between the negative bus DC-in and DC-out. Relay K1 is connected to VCC24V.

6. The elevator energy feedback unit anti-reverse connection circuit according to claim 5, characterized in that: If the wiring sequence is correct, the proportional operation circuit output Vdc is a positive voltage, and if it is reversed, the proportional operation circuit output Vdc is a negative voltage; if the proportional operation circuit outputs Vdc as a positive voltage, the comparison circuit output Vcom is a high impedance state, and if the proportional operation circuit outputs Vdc as a negative voltage, the comparison circuit output Vcom is a low level; if the comparison circuit outputs Vcom as a high impedance state, the optocoupler U3 will be turned on, and the isolation circuit output Driver will be a 24V high level. If the comparison circuit outputs Vcom as a low level, the isolation circuit output Driver will be a high impedance state; if the isolation circuit outputs Driver as a 24V high level, the transistor Q1 will be turned on, the relay K1 will be energized, the bus negative voltage circuit will be turned on, DC-in and DC-out will be turned on, and the elevator energy feedback unit will be powered normally. If the isolation circuit outputs Driver as a high impedance state, the negative bus voltage circuit will be disconnected, thereby protecting the elevator energy feedback unit device and avoiding damage.

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