CN203151367U - Powering-on buffer device of energy feedback converter - Google Patents
Powering-on buffer device of energy feedback converter Download PDFInfo
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- CN203151367U CN203151367U CN 201320030444 CN201320030444U CN203151367U CN 203151367 U CN203151367 U CN 203151367U CN 201320030444 CN201320030444 CN 201320030444 CN 201320030444 U CN201320030444 U CN 201320030444U CN 203151367 U CN203151367 U CN 203151367U
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- energy feedback
- frequency converter
- detection module
- switch
- voltage detection
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Abstract
The utility model provides a powering-on buffer device of an energy feedback converter. The device comprises a charging resistor R, an incoming wire circuit breaker K1, a charging contactor K2 and a control system. The control system comprises a voltage control module, a bus voltage detection module and a switch trigger circuit, wherein the bus voltage detection module is used for detecting a bus and the voltage control module is used for receiving a detection signal of the bus voltage detection module. The voltage control module controls on/off of a switch through the switch trigger circuit; and the voltage control module controls the switch to be opened and closed when a comparison made between the detection signal of the bus voltage detection module and a preset threshold value shows that the detection signal of the bus voltage detection module is below the threshold value. The powering-on buffer device of the energy feedback converter, provided by the utility model, realizes free energy feedback, is lower in cost and high in safety and can be widely used in the field of power electronics.
Description
Technical field
The utility model relates to a kind of topological main circuit of energy feedback frequency converter and the buffer circuit structure that powers on, and belongs to field of power electronics, more particularly, but relates to a kind of buffer unit that powers on of energy feedback frequency converter.
Background technology
Conventional general AC-DC-AC type frequency converter generally is made up of rectification circuit, buffer circuit, filter circuit and inverter circuit four parts.The rectification circuit three-phase alternating current that incoming frequency is fixing is rectified into direct current, and its voltage is busbar voltage; Voltage after the rectification is pulsating voltage, in addition filtering, and filter capacitor plays filtering and energy storage effect, eliminates voltage fluctuation; Last inverter circuit becomes all adjustable alternating currents of frequency, amplitude with dc inverter.Because storage capacitor is bigger; the electric capacity both end voltage is zero when inserting power supply; thereby it is very big in the charging current of powered on moment filter capacitor; excessive electric current can damage rectifier bridge diode and electric capacity; be the protection rectifier bridge; powered on moment seals in the dc bus charging resistor with the restriction charging current, when electric capacity is charged to a certain degree by switch with resistive short.Charging resistor and switch namely constitute the buffer circuit that powers on of frequency converter.
General AC-DC-AC type frequency converter major defect is because the unidirectional conduction of diode, and electric energy can only one-way flow, passes to load by electrical network.When motor slows down, to brake or the weight that has a potential energy when transferring, motor is in regenerative power generation state, because the transmission of diode rectifier bridge energy is irreversible, the regenerative electric energy of generation can not be sent electrical network back to and be caused energy dissipation, even can damage frequency converter.For the problem of the recycling that solves the energy that produces when motor is in regenerative electric power, so but designed energy feedback frequency converter in the prior art.
The frequency converter that constitutes according to this main circuit form topology can solve the difficult problem of energy feedback, and when motor is in when dragging state, energy is by AC network filter capacitor charging in the middle of rectifier, and inverter is sent to motor at PWM control decline energy; When motor is in when running slowly state, because the load effect of inertia enters generating state, its regenerated energy switch element and fly-wheel diode in inverter charge to middle filter capacitor, middle dc voltage is raise, switch element is fed into AC network at PWM control decline energy in the rectifier at this moment, finishes the two-way flow of energy.
But there is the big problem of charging current of powered on moment filter capacitor in energy feedback frequency converter in the prior art, need be on dc bus serial connection charge resistance and charge switch.The major defect of this buffer unit that powers on is because charge switch is dc switch, need by whole energy, so contact capacity is bigger, and the dc switch volume is big, and the price height is not easy during fault to disconnect, and has increased system cost, has reduced fail safe.
The utility model content
The technical problems to be solved in the utility model is, can not feedback and universal frequency converter power on buffer circuit price height, the low defective of fail safe at universal frequency converter energy in the prior art, but the utility model provides a kind of buffer unit that powers on of energy feedback frequency converter.
But the utility model provides a kind of buffer unit that powers on of energy feedback frequency converter, but a kind of buffer unit that powers on of energy feedback frequency converter comprises: charging resistor, lead-in circuit breaker, charging contactor and control system;
Wherein, control system comprises voltage control module, busbar voltage detection module and switch triggering circuit;
Wherein, the busbar voltage detection module is for detection of bus, and voltage control module is used for receiving the detection signal of busbar voltage detection module;
Wherein, voltage control module is by the break-make of switch triggering circuit controling switch.
Preferably, the detection signal of described busbar voltage detection module compares with the threshold values that sets in advance, and when the detection signal of busbar voltage detection module was lower than threshold values, voltage control module was by disconnection and the closure of circuits for triggering control switch.
Preferably, but the buffer unit that powers on of its described energy feedback frequency converter also comprises electrical network, and electrical network is input as three-phase alternating current R, S and T.
Preferably, described three-phase alternating current R, S and T connect with three-phase contactor inlet wire contact K1, K2, K3 respectively, and three-phase contactor outlet contact K4, K5, K6 and three pole reactor L1, L2, L3 are in series.
Preferably, the inlet wire contact 1 of described charging contactor K2,2 links to each other with electrical network S, T, the outlet contact 5,6 of charging contactor K2 outlet contact 5,6 and lead-in circuit breaker K1 links to each other, and the inlet wire contact 3 of charging contactor K2 links to each other with charging resistor R two ends respectively with outlet contact 4.
But implement the buffer unit that powers on of energy feedback frequency converter of the present utility model, have following beneficial effect: not only realized the free feedback of energy, but also reduced cost, safe, thereby can have been used widely in field of power electronics.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
But Fig. 1 is the buffer unit circuit theory diagrams that power on of the utility model energy feedback frequency converter;
Fig. 2 is the electrical block diagram of general AC-DC-AC type frequency converter in the prior art;
But Fig. 3 is the topology diagram of energy feed-back type PWM voltage-source type frequency converter in the prior art.
Embodiment
See also Fig. 1, but be the buffer unit circuit theory diagrams that power on of the utility model energy feedback frequency converter.As shown in Figure 1, the buffer unit that powers on comprises charging resistor R, lead-in circuit breaker K1, charging contactor K2 and control system thereof; Wherein, control system comprises voltage control module, busbar voltage detection module and switch triggering circuit; The busbar voltage detection module is for detection of bus, and voltage control module is used for receiving the detection signal of busbar voltage detection module; Voltage control module is by the break-make of switch triggering circuit controling switch.The detection signal of busbar voltage detection module compares with the threshold values that sets in advance, and when the detection signal of busbar voltage detection module was lower than threshold values, voltage control module was by disconnection and the closure of circuits for triggering control switch.
The utility model is when connecting, this device is connected with the three-phase alternating current electrical network, in the present embodiment, the three-phase alternating current of electrical network input is walked justice respectively and is R, S and T, three inlet wire contacts 1 of three-phase alternating current R, S and T and three-phase contactor K1,2,3 link to each other, and three outlet contacts 4,5,6 of three-phase contactor K1 link to each other with three pole reactor.
The inlet wire contact 1 of charging contactor K2,2 links to each other with electrical network S, T, and the outlet contact 5,6 of charging contactor K2 outlet contact 5,6 and lead-in circuit breaker K1 links to each other, and the inlet wire contact 3 of charging contactor K2 links to each other with charging resistor R two ends respectively with outlet contact 4.
The operation principle of this device is, during charging, disconnects lead-in circuit breaker K1 earlier, and the charging contactor K2 that closes can be by the bus filter capacitor charging of charging resistor R; After charging was finished, the lead-in circuit breaker K1 that closes disconnected charging contactor K2, can disconnect charging resistor R, and electric energy namely flows into major loop from lead-in circuit breaker K1.
The beneficial effects of the utility model are: the utility model can not only overcome the shortcoming that universal frequency converter energy in the prior art can not feedback, and can also overcome present universal frequency converter power on buffer circuit price height, the low shortcoming of fail safe.Adopt to exchange the original D.C. contactor of lead-in circuit breaker replacement, when frequency converter breaks down, can fast frequency converter be broken from electrical network, thereby play the safeguard protection effect.In the former scheme, the DC charging contactor is worked always, and requiring its capacity is 1: 1, and cost is higher; And charging contactor of the present utility model is only worked when charging, can choose the A.C. contactor of low capacity, greatly reduces cost.
The utility model is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the utility model scope, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion of the utility model technology, can carry out many modifications and not break away from its protection range the utility model.Therefore, the utility model is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.
Claims (5)
1. but the buffer unit that powers on of an energy feedback frequency converter comprises: charging resistor R, lead-in circuit breaker K1, charging contactor K2 and control system;
Wherein, control system comprises voltage control module, busbar voltage detection module and switch triggering circuit;
Wherein, the busbar voltage detection module is for detection of bus, and voltage control module is used for receiving the detection signal of busbar voltage detection module;
Wherein, voltage control module is by the break-make of switch triggering circuit controling switch.
2. the buffer unit that powers on of energy feedback frequency converter according to claim 1, it is characterized in that, the detection signal of described busbar voltage detection module compares with the threshold values that sets in advance, when the detection signal of busbar voltage detection module was lower than threshold values, voltage control module was by disconnection and the closure of circuits for triggering control switch.
3. the buffer unit that powers on of energy feedback frequency converter according to claim 1 and 2 is characterized in that, comprises that also electrical network, electrical network are input as three-phase alternating current R, S and T.
4. but the buffer unit that powers on of energy feedback frequency converter according to claim 3, it is characterized in that, described three-phase alternating current R, S and T connect with three-phase contactor inlet wire contact K1, K2, K3 respectively, and three-phase contactor outlet contact K4, K5, K6 and three pole reactor L1, L2, L3 are in series.
5. but the buffer unit that powers on of energy feedback frequency converter according to claim 4, it is characterized in that, the inlet wire contact 1 of described charging contactor K2,2 links to each other with electrical network S, T, the outlet contact 5,6 of charging contactor K2 outlet contact 5,6 and lead-in circuit breaker K1 links to each other, and the inlet wire contact 3 of charging contactor K2 links to each other with charging resistor R two ends respectively with outlet contact 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320030444 CN203151367U (en) | 2013-01-21 | 2013-01-21 | Powering-on buffer device of energy feedback converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320030444 CN203151367U (en) | 2013-01-21 | 2013-01-21 | Powering-on buffer device of energy feedback converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203151367U true CN203151367U (en) | 2013-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320030444 Expired - Fee Related CN203151367U (en) | 2013-01-21 | 2013-01-21 | Powering-on buffer device of energy feedback converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203151367U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111293945A (en) * | 2020-02-27 | 2020-06-16 | 山东欧瑞安电气有限公司 | Servo press driving system |
| CN112467969A (en) * | 2020-11-05 | 2021-03-09 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
-
2013
- 2013-01-21 CN CN 201320030444 patent/CN203151367U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111293945A (en) * | 2020-02-27 | 2020-06-16 | 山东欧瑞安电气有限公司 | Servo press driving system |
| CN112467969A (en) * | 2020-11-05 | 2021-03-09 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
| CN112467969B (en) * | 2020-11-05 | 2021-12-03 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20170121 |