CN201639546U - Alternating-current motor energy saving device - Google Patents
Alternating-current motor energy saving device Download PDFInfo
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- CN201639546U CN201639546U CN2009202926644U CN200920292664U CN201639546U CN 201639546 U CN201639546 U CN 201639546U CN 2009202926644 U CN2009202926644 U CN 2009202926644U CN 200920292664 U CN200920292664 U CN 200920292664U CN 201639546 U CN201639546 U CN 201639546U
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Abstract
The utility model relates to an alternating-current motor energy saving device which is composed of a bidirectional buck-boost DC/DC converter, a voltage sensor, a current sensor, an energy storage module, an input/output interface, a full-digital controller and an auxiliary power source. The bidirectional DC/DC converter stores the electric energy, which is converted from mechanical energy when the alternating-current motor brakes, into the energy storage module; and when the motor is in the electric working state, the electric energy is withdrawn from the energy storage module and supplied to the motor through the bidirectional DC/DC converter-inverter. The utility model has the advantages of high energy saving efficiency, simple structure, low cost, flexible control, convenient operation and the like.
Description
Technical field
The utility model relates to a kind of alternating current machine energy saver, and particularly a kind of device that adopts the automatic motor conditions sensed of total digitalization and improve the system power utilance belongs to energy-saving field.
Background technology
In recent years, the economize on electricity consumption reduction has become an important topic that concerns national economy, and the development low-carbon economy is an important topic of putting at present in face of China's industrial development.In China, electric motor system is a large amount of wide application industry of a face always.At present, Chinese electric system power consumption has almost accounted for 60% of China's whole nation power consumption, and wherein the power consumption of blower fan, pump class, compressor and air conditioner refrigerating device accounts for 10.4%, 20.9%, 9.4% and 6% of national power consumption respectively.Motor drive system efficient is lower 10～30 percentage points than developed country, is equivalent to the level of international the 1970s and 1980s in 20th century.Certain gap is all being arranged aspect useful life, reliability, material consumption, noise and the vibration.And from global range, the power consumption of motor on average accounts for the over half of countries in the world society total electricity consumption, accounts for about 70% of industrial electric weight.Therefore, the raising of electric system efficient, very great to the saves energy meaning, and can reduce the carbon emission amount of per GDP effectively.
In order to reach the purpose of energy-saving and emission-reduction, what extensively adopted in the alternating current machine field at present is the converter technology (see figure 3), changes rotating speed of motor by the output frequency of regulating frequency converter, makes it to adapt to different loads, reduces the energy consumption of motor.Yet converter technology needs frequent motor starting/parking or in application scenarios such as some lifts, elevator, cranes at some, alternating current machine can be in generating state when braking, mechanical energy is converted to electric energy, makes the DC bus-bar voltage of frequency converter raise.In order to protect the safe in utilization of frequency converter electric energy to be discharged, thereby guarantee that DC bus-bar voltage can be not too high by bleeder resistance.Electric energy has just slatterned in vain like this.In order to utilize this part electric energy, can adopt PWM controlled rectification technology (see figure 4), the electric energy that alternating current machine is fed back feeds back to electrical network by the PWM controlled rectifier.But this Technology Need increases a PWM rectifier, and total cost is the twice of single inverter, and control is very complicated, also can inject the harmonic pollution that extra harmonic wave causes electrical network to electrical network.
Summary of the invention
The utility model provides a kind of alternating current machine energy saver at existing in prior technology subject matter.The electrical power storage of being changed by mechanical energy when utilizing two-way DC/DC converter that alternating current machine is braked when motor is in electronic operating state, is taken out electric energy by two-way DC/DC converter--frequency converter offers motor in super capacitor again from super capacitor.
The purpose of this utility model is achieved in that
A kind of alternating current machine energy saver comprises:
Two-way buck DC/DC converter, the control electric energy flows to energy-storage module from the dc bus of frequency converter, perhaps controls electric energy and flows to dc bus from energy-storage module;
Voltage sensor is a voltage signal with the voltage transitions of DC bus-bar voltage and energy-storage module;
Current sensor, the current conversion that will flow through two-way buck DC/DC converter is a current signal;
Energy-storage module stores the electric energy that alternating current machine feeds back;
Input/output interface, this interface is made up of input signal conditioning circuit and output signal driver circuit, be used for will input voltage, current signal be converted to the signal that dsp controller can be accepted, with the control signal of DSP output be converted to can the driving power device signal;
The full-digital control device is used to detect voltage and current signal, by the calculating of control core (DSP), provides the control signal of two-way buck DC/DC converter.
Related content in the technique scheme is explained as follows:
1, in the such scheme, comprises a two-way buck DC/DC converter at least, energy-storage module, input voltage sensor, output voltage sensor, current sensor, input/output interface, full-digital control device, accessory power supply.Described two-way buck DC/DC converter, its output is connected with the dc bus of frequency converter, and two-way buck DC/DC converter is made up of two power switchs and a high-frequency inductor, and power switch can be that power MOSFET or IGBT form.High-frequency inductor one end connects the mid point of two power switch series connection brachium pontis, and an end connects the anode of energy-storage module.The following pipe of power-switch arm is connected to the negative terminal and the dc bus negative terminal of energy-storage module simultaneously, can the control energy two-way flow, and one of them direction is a boosting inverter, the another one direction is a decompression transformation.Described input voltage sensor and output voltage sensor connect the positive and negative terminal of dc bus positive and negative terminal and energy-storage module respectively, are voltage signal with the voltage transitions of DC bus-bar voltage and energy-storage module.Described current sensor is connected the energy-storage module output, and the current conversion that will flow through two-way buck DC/DC converter is a current signal.Described energy-storage module is connected with two-way buck DC/DC converter input, is used to store the electric energy of alternating current machine feedback.Described input/output interface, gate pole, the full-digital control device with input voltage sensor and output voltage sensor, current sensor, power switch is connected respectively.This interface is made up of input signal conditioning circuit and output signal driver circuit, be used for will input voltage, current signal be converted to the signal that dsp controller can be accepted, with the control signal of DSP output be converted to can the driving power device signal.Described full-digital control device is connected with input/output interface, is used to detect voltage and current signal, by the calculating of control core DSP, provides the control signal of two-way buck DC/DC converter.
2, in the such scheme, also comprise an energy-storage module, this module is made up of super capacitor or other electric energy storing devices.
3, in the such scheme, comprise that also accessory power supply is described device power supply.
Because the technique scheme utilization, the utility model compared with prior art has following advantage:
1, the utility model, by the control to frequency changer direct current bus voltage, the electric energy that all alternating current machines are fed back all is stored into energy-storage units, avoids connecting bleeder resistance because of DC bus-bar voltage raises, electric energy is released, so the energy-saving efficiency height;
2, the utility model and PWM controlled rectification technology structure compared is simple, cost is low.Because the utility model only needs 2 power switchs, 1 inductance, and 6 power switchs of PWM controlled rectification Technology Need and 3 inductance;
3, to adopt with DSP be the full-digital control technology of core to the utility model, control flexibly, easy to use, needs only on the dc bus with output incoming transport electric machine controller.
Description of drawings
Fig. 1 is that the utility model alternating current machine energy saver is used block diagram;
Fig. 2 is the utility model alternating current machine energy saver structure chart;
Fig. 3 is present AC Motor Control system diagram;
Fig. 4 is can be to the AC Motor Control system diagram of electrical network feedback electric energy.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment: a kind of alternating current machine energy saver comprises:
A two-way buck DC/DC converter 110, energy-storage module 111, input voltage sensor 112, output voltage sensor 113, current sensor 114, input/output interface 115, full-digital control device 116, accessory power supply 117 is formed.Two-way buck DC/DC converter 110 outputs are connected with the dc bus of frequency converter, two-way buck DC/DC converter 110 is made up of last power switch 201, following power switch 202 and a high-frequency inductor 203, and power switch can be that power MOSFET or IGBT form.High-frequency inductor 203 1 ends connect to be gone up connect with following power switch 202 mid point of brachium pontis of power switch 201, the anode of end connection energy-storage module 111.The following pipe of power-switch arm is connected to the negative terminal and the dc bus negative terminal of energy-storage module 111 simultaneously, can the control energy two-way flow, and one of them direction is a boosting inverter, the another one direction is a decompression transformation.
Described input voltage sensor 112 and output voltage sensor 113 are voltage signal with the voltage transitions of DC bus-bar voltage and energy-storage module 111.
Described current sensor 114, the current conversion that will flow through two-way buck DC/DC converter 110 is a current signal.
Described energy-storage module 111 stores the electric energy that alternating current machine 107 feeds back.This module is made up of super capacitor 204 or other electric energy storing devices.
Described input/output interface 115 is connected with gate pole, the full-digital control device 116 of input voltage sensor 112 with output voltage sensor 113, current sensor 114, last power switch 201, following power switch 202 respectively.This interface is made up of input signal conditioning circuit and output signal driver circuit, be used for will input voltage, current signal be converted to the signal that dsp controller can be accepted, with the control signal of DSP output be converted to can the driving power device signal.
Described full-digital control device 116 is connected with input/output interface 115, is used to detect voltage and current signal, by the calculating of control core (DSP), provides the control signal of two-way buck DC/DC converter 110.
Described accessory power supply 117 provides power supply for described full-digital control device 116 and input/output interface 115.
Particular content is explained as follows, and the utility model is used for the AC Motor Control system that frequency converter drives, and sees Fig. 3.A kind of alternating current machine energy saver of the utility model is connected with the dc bus of frequency converter, sees Fig. 1.AC power 101 is converted to direct current by rectification module 102 with alternating current, through filter capacitor 103, to alternating current machine 107 power supplies, and drags load 108 operations by inversion unit 106.When needs were braked, because load 108 has bigger inertia, its kinetic energy can be converted to electric energy by alternating current machine 107, and just alternating current machine 107 is in generating state with the reverse feedback of electric energy.Because so rectification module 102 can only unidirectional conducting can't feed back to electrical network with electric energy, so DC bus-bar voltage is raise.In order not make too high voltage damage control system, just need controlled discharge switch 105 that bleeder resistance 104 is connected, electric energy is released by resistance 104.Need frequently be in electronic application scenario of switching with braking mode at alternating current machine, this control method can be lost a large amount of electric energy.In order to improve utilization rate of electrical, discharge again when feedback energy stored etc. and to need when the utility model can be with braking.
As shown in Figure 2, when output voltage sensor 113 detected DC bus-bar voltage above set point, full-digital control device 116 judged that alternating current machines 107 are in on-position.The gate pole of power switch 202 made it be in off state under full-digital control device 116 drove by input/output interface 115, drove the gate pole of going up power switch 201 simultaneously, and gave 201 1 suitable substance P WM of last power switch duty ratio.At this moment form buck circuit by last power switch 201 and inverse parallel diode and high-frequency inductor 203 in the following power switch 202, the control electric energy flows to energy-storage module 111 from dc bus.The calculating of PWM duty ratio is that full-digital control device 116 is determined according to the electric current of current sensor 114 detections and energy-storage module 111 voltages of input voltage sensor 112 detections.
When output voltage sensor 113 detected DC bus-bar voltage and is lower than set point, full-digital control device 116 judged that alternating current machines 107 are in motoring condition.Full-digital control device 116 drives the gate pole of going up power switch 201 by input/output interface 115 makes it be in off state, drives the gate pole of rate switch 202 down simultaneously, and gives 202 1 suitable substance P WM of rate switch duty ratio down.At this moment form boost chopper by the inverse parallel diode and the high-frequency inductor 203 of following rate switch 202 and last power switch 201, the control electric energy flows to dc bus from energy-storage module 111.The calculating of PWM duty ratio is that full-digital control device 116 is determined according to the electric current of current sensor 114 detections and energy-storage module 111 voltages of input voltage sensor 112 detections.At this moment since portion of energy from energy-storage module 111, therefore, the electric energy that obtains from AC power 101 will reduce, so can reach purpose of energy saving.
Energy-storage module 111 is the vitals in the native system, is used to store the electric energy of alternating current machine 107 feedbacks.This module is made up of super capacitor 204 or other electric energy storing devices, and the capacity of energy-storage module 111 is set according to different application.If the capacity of selecting will cause cost waste too greatly,, cause waste of electric energy if too little then feedback electric energy can't be absorbed fully.So the capacity of energy-storage module 111 can and leave the part surplus and calculate or draw by experiment according to the statistics of data such as the moment of inertia of load 108, braking time length, deceleration size.During experiment continuous increase capacity up to when braking bleeder resistance 104 do not raise because of DC bus-bar voltage start till.
The foregoing description only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection range of the present utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection range of the present utility model.
Claims (3)
1. alternating current machine energy saver is characterized in that:
Comprise at least one two-way buck DC/DC converter (110), energy-storage module (111), input voltage sensor (112), output voltage sensor (113), current sensor (114), input/output interface (115), full-digital control device (116), accessory power supply (117)
Described two-way buck DC/DC converter (110), its output is connected with the dc bus of frequency converter, input is connected with energy-storage module (111), this two-way buck DC/DC converter (110) control electric energy flows to energy-storage module (111) from the dc bus of frequency converter, perhaps controls electric energy and flows to dc bus from energy-storage module (111);
Described input voltage sensor (112) and output voltage sensor (113) connect the positive and negative terminal of dc bus positive and negative terminal and energy-storage module (111) respectively, are voltage signal with the voltage transitions of DC bus-bar voltage and energy-storage module (111);
Described current sensor (114) is connected energy-storage module (111) output, and the current conversion that will flow through two-way buck DC/DC converter (110) is a current signal;
Described energy-storage module (111) is connected with two-way buck DC/DC converter (110) input, is used to store the electric energy of alternating current machine (107) feedback;
Described input/output interface (115), be connected with gate pole, the full-digital control device (116) of input voltage sensor (112) respectively with output voltage sensor (113), current sensor (114), last power switch (201), following power switch (202), this interface is made up of input signal conditioning circuit and output signal driver circuit, be used for will input voltage, current signal be converted to the signal that dsp controller can be accepted, with the control signal of DSP output be converted to can the driving power device signal;
Described full-digital control device (116) is connected with input/output interface (115), is used to detect voltage and current signal, by the calculating of control core DSP, provides the control signal of two-way buck DC/DC converter (110);
Described accessory power supply (117) provides power supply for described full-digital control device (116) and input/output interface (115).
2. a kind of alternating current machine energy saver as claimed in claim 1, it is characterized in that, two-way buck DC/DC converter (110) is made up of last power switch (201), following power switch (202) and a high-frequency inductor (203), power switch can be that power MOSFET or IGBT form, high-frequency inductor (203) one ends connect to be gone up connect with following power switch (202) mid point of brachium pontis of power switch (201), the anode of end connection energy-storage module (111); The following pipe of power-switch arm is connected to the negative terminal and the dc bus negative terminal of energy-storage module (111) simultaneously, can the control energy two-way flow, and one of them direction is a boosting inverter, the another one direction is a decompression transformation.
3. a kind of alternating current machine energy saver as claimed in claim 1 is characterized in that energy-storage module (111) is made up of super capacitor (204) or other electric energy storing devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202926644U CN201639546U (en) | 2009-12-29 | 2009-12-29 | Alternating-current motor energy saving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202926644U CN201639546U (en) | 2009-12-29 | 2009-12-29 | Alternating-current motor energy saving device |
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| CN201639546U true CN201639546U (en) | 2010-11-17 |
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| CN2009202926644U Expired - Lifetime CN201639546U (en) | 2009-12-29 | 2009-12-29 | Alternating-current motor energy saving device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780083A (en) * | 2012-10-17 | 2014-05-07 | 德州仪器公司 | Energy management system and method |
| CN103795258A (en) * | 2012-10-30 | 2014-05-14 | Ls产电株式会社 | Apparatus and method for controlling bidirectional DC-DC converter |
| CN104779633A (en) * | 2015-04-08 | 2015-07-15 | 中国西电电气股份有限公司 | Power compensation and energy recovery device for gas power generation system |
| CN105083034A (en) * | 2015-07-30 | 2015-11-25 | 株洲南车时代电气股份有限公司 | Alternating current-direct current electric locomotive traction device and system |
| CN105720806A (en) * | 2014-12-02 | 2016-06-29 | 永济新时速电机电器有限责任公司 | Chopper circuit |
| CN105991059A (en) * | 2015-01-29 | 2016-10-05 | 乐金电子研发中心(上海)有限公司 | Inverter system and method of reducing capacitance of inverter DC bus |
| CN106159979A (en) * | 2015-04-01 | 2016-11-23 | 神华集团有限责任公司 | The control system of electrical network and power distribution network |
| CN106655963A (en) * | 2015-10-30 | 2017-05-10 | 北京精密机电控制设备研究所 | Bidirectional control circuit and control method based on free piston Stirling linear motor |
| CN108493975A (en) * | 2018-06-12 | 2018-09-04 | 新风光电子科技股份有限公司 | A kind of super capacitor energy-storage type network load balancing device and its control method |
| CN111371348A (en) * | 2020-04-03 | 2020-07-03 | 宁波安信数控技术有限公司 | Active clamping braking circuit and method for servo driver |
| US10771001B2 (en) | 2015-09-11 | 2020-09-08 | Invertedpower Pty Ltd | Controller for an inductive load having one or more inductive windings |
| US11267358B2 (en) | 2017-05-08 | 2022-03-08 | Invertedpower Pty Ltd | Vehicle charging station |
| US11479139B2 (en) | 2015-09-11 | 2022-10-25 | Invertedpower Pty Ltd | Methods and systems for an integrated charging system for an electric vehicle |
-
2009
- 2009-12-29 CN CN2009202926644U patent/CN201639546U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780083A (en) * | 2012-10-17 | 2014-05-07 | 德州仪器公司 | Energy management system and method |
| US9746868B2 (en) | 2012-10-17 | 2017-08-29 | Texas Instruments Incorporated | Single inductor multiple output discontinuous mode DC-DC converter and process |
| CN103780083B (en) * | 2012-10-17 | 2019-01-18 | 德州仪器公司 | energy management system and method |
| CN103795258A (en) * | 2012-10-30 | 2014-05-14 | Ls产电株式会社 | Apparatus and method for controlling bidirectional DC-DC converter |
| CN103795258B (en) * | 2012-10-30 | 2017-03-29 | Ls产电株式会社 | Apparatus and method for controlling two-way DC DC transducers |
| CN105720806A (en) * | 2014-12-02 | 2016-06-29 | 永济新时速电机电器有限责任公司 | Chopper circuit |
| CN105991059A (en) * | 2015-01-29 | 2016-10-05 | 乐金电子研发中心(上海)有限公司 | Inverter system and method of reducing capacitance of inverter DC bus |
| CN106159979A (en) * | 2015-04-01 | 2016-11-23 | 神华集团有限责任公司 | The control system of electrical network and power distribution network |
| CN104779633A (en) * | 2015-04-08 | 2015-07-15 | 中国西电电气股份有限公司 | Power compensation and energy recovery device for gas power generation system |
| CN105083034A (en) * | 2015-07-30 | 2015-11-25 | 株洲南车时代电气股份有限公司 | Alternating current-direct current electric locomotive traction device and system |
| US10771001B2 (en) | 2015-09-11 | 2020-09-08 | Invertedpower Pty Ltd | Controller for an inductive load having one or more inductive windings |
| US11479139B2 (en) | 2015-09-11 | 2022-10-25 | Invertedpower Pty Ltd | Methods and systems for an integrated charging system for an electric vehicle |
| CN106655963A (en) * | 2015-10-30 | 2017-05-10 | 北京精密机电控制设备研究所 | Bidirectional control circuit and control method based on free piston Stirling linear motor |
| US11267358B2 (en) | 2017-05-08 | 2022-03-08 | Invertedpower Pty Ltd | Vehicle charging station |
| CN108493975A (en) * | 2018-06-12 | 2018-09-04 | 新风光电子科技股份有限公司 | A kind of super capacitor energy-storage type network load balancing device and its control method |
| CN111371348A (en) * | 2020-04-03 | 2020-07-03 | 宁波安信数控技术有限公司 | Active clamping braking circuit and method for servo driver |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
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Granted publication date: 20101117 |