CN204669215U - A kind of frequency converter powers on and cushions and bus discharge circuit - Google Patents
A kind of frequency converter powers on and cushions and bus discharge circuit Download PDFInfo
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- CN204669215U CN204669215U CN201520383134.6U CN201520383134U CN204669215U CN 204669215 U CN204669215 U CN 204669215U CN 201520383134 U CN201520383134 U CN 201520383134U CN 204669215 U CN204669215 U CN 204669215U
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Abstract
The utility model discloses a kind of frequency converter power on buffering and bus discharge circuit, comprise rectification module, the first resistance, relay, the first electric capacity, optocoupler, the second electric capacity, the second resistance, the 3rd resistance, the first diode, the second diode, the first voltage-stabiliser tube and power switch pipe, the input of optocoupler is connected with alternating current by the 3rd resistance, its output collector electrode is connected with the gate pole of power switch pipe, and its output emitter is connected with the negative electrode of power switch pipe; Second electric capacity is connected between the gate pole of power switch pipe and negative electrode, and the first voltage-stabiliser tube and the second electric capacity are in parallel; Second resistance is connected between the gate pole of power switch pipe and the positive pole of the first electric capacity; The anode of the first diode is connected with the first resistance, and its negative electrode is connected with the positive pole of the first electric capacity; Second diode and relay are in parallel, and the anode of power switch pipe is connected with the anode of the first diode.The utility model can realize powering on the quick discharge function of dc-link capacitance after buffering and power-off.
Description
Technical field
The utility model relates to converter technology field, and more particularly, particularly a kind of frequency converter powers on and cushions and bus discharge circuit.
Background technology
In the process of socio-economic development, Based Intelligent Control and green energy conservation are the targets that people pursue always.Because frequency converter is provided with above two features, more and more extensive in the application of industrial and agricultural production every field.Universal frequency converter is mostly voltage-type AC and DC hybrid transmission system, namely first becomes direct current after AC rectification filtering, then becomes the alternating current of frequency-adjustable to carry out drive motors DC power conversion.
The DC bus of frequency converter is made up of jumbo alminium electrolytic condenser usually, and due to the inherent characteristic of electric capacity, frequency converter needs the buffer circuit that powers on usually, and charging current large when preventing from powering on damages rectifier bridge and electric capacity.Fig. 1 is that general frequency converter powers on buffer circuit, its operation principle is: when frequency converter powers on, input ac voltage converts direct current to by rectification module U1, direct voltage is charged to bus capacitor C1 by resistance R1, after charging complete, control system drives relay K 1 adhesive, namely completes start-up course.
Because rectification link is generally irreversible passive type rectification, when frequency converter input power-off, the electric energy being stored in DC bus side can only be discharged by motor load and auxiliary switching power supply.For the consideration of cost and volume, auxiliary switching power supply input service voltage range can not non-constant width, as the frequency converter that single-phase 220V inputs, the working range of Switching Power Supply is generally direct current 200V to 400V, the frequency converter that three-phase 380V inputs, the working range of Switching Power Supply is generally direct current 400V to 800V.Therefore; after frequency converter input normal power down; DC bus begins through accessory power supply and discharges; when the minimum operating voltage of busbar voltage lower than Switching Power Supply; bus capacitor can only rely on the leakage current of itself and the leakage current of power management chip to discharge, and the velocity of discharge will become slowly.For the requirement to personal safety, after usually requiring user or maintenance personal's power-off in the operating instruction of frequency converter, wait for that ten minutes ability carries out taking out stitches and maintenance operation.Not only reduce the operating efficiency of user and maintenance person like this, also likely because of carelessness, security incident is caused for layman.
Because the buffer circuit that powers on of the frequency converter shown in Fig. 1 does not possess the function of bus discharge.Therefore, to power on buffering and bus discharge scheme desirable to provide the simple and effective frequency converter of one, make it can realize the pooling feature that powers on of frequency converter, the quick discharge function of dc-link capacitance after frequency converter input power-off can be realized again.
Utility model content
The purpose of this utility model is to provide a kind of frequency converter to power on buffering and bus discharge circuit, and this circuit can realize the pooling feature that powers on of frequency converter, can realize again the quick discharge function of dc-link capacitance after frequency converter input power-off.
In order to achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of frequency converter powers on and cushions and bus discharge circuit, comprise rectification module, the first resistance, relay and the first electric capacity, it also comprises optocoupler, the second electric capacity, the second resistance, the 3rd resistance, the first diode, the second diode, the first voltage-stabiliser tube and power switch pipe
Wherein, the input of described optocoupler is connected with alternating current by the 3rd resistance, and its output collector electrode is connected with the gate pole of power switch pipe, and its output emitter is connected with the negative electrode of power switch pipe;
Described second electric capacity is connected between the gate pole of power switch pipe and negative electrode, and described first voltage-stabiliser tube and the second electric capacity are in parallel;
Described second resistance is connected between the gate pole of power switch pipe and the positive pole of the first electric capacity;
The anode of described first diode is connected with the first resistance, and its negative electrode is connected with the positive pole of the first electric capacity;
Described second diode and relay are in parallel, and the anode of described power switch pipe is connected with the anode of the first diode.
Preferably, described power switch pipe is IGBT pipe or power MOSFET tube.
Preferably, described first resistance is power resistor.
Compared with prior art, the utility model has the advantage of: the utility model passes through use first resistance, when frequency converter input powers on, as the buffer starting resistance that powers on of frequency converter; Under frequency converter input during electricity, as the bus capacitor discharge resistance of frequency converter.It is relative to special discharge circuit, do not need additionally to increase power dissipation component, control circuit is simple, and cost is low and electric discharge working range is wide, the pooling feature that powers on of frequency converter can be realized, the quick discharge function of dc-link capacitance after frequency converter input power-off can be realized again.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that existing frequency converter powers on the circuit diagram of buffer circuit.
Fig. 2 is that frequency converter described in the utility model powers on buffering and the circuit diagram of bus discharge circuit.
Fig. 3 be frequency converter described in the utility model power on buffering and bus discharge circuit charge time current direction figure.
Fig. 4 be frequency converter described in the utility model power on buffering and bus discharge circuit discharge time current direction figure.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, to make advantage of the present utility model and feature can be easier to be readily appreciated by one skilled in the art, thus more explicit defining is made to protection range of the present utility model.
Consult shown in Fig. 2, the utility model provides a kind of frequency converter to power on and cushions and bus discharge circuit, comprise rectification module U1, the first resistance R1, relay K 1 and the first electric capacity C1, it also comprises optocoupler U2, the second electric capacity C2, the second resistance R2, the 3rd resistance R3, the first diode D1, the second diode D2, the first voltage-stabiliser tube Z1 and power switch pipe Q1.
In the utility model, the input of described optocoupler U2 is connected with alternating current by the 3rd resistance R3, and its output collector electrode is connected with the gate pole of power switch pipe Q1, and its output emitter is connected with the negative electrode of power switch pipe Q1; Between the gate pole that described second electric capacity C2 is connected to power switch pipe Q1 and negative electrode, described first voltage-stabiliser tube Z1 and the second electric capacity C2 is in parallel; Described second resistance R2 is connected between the gate pole of power switch pipe Q1 and the positive pole of the first electric capacity C1; The anode of described first diode D1 is connected with the first resistance R1, and its negative electrode is connected with the positive pole of the first electric capacity C1; Described second diode D2 and relay K 1 are in parallel, and the anode of described power switch pipe Q1 is connected with the anode of the first diode D1.
In the utility model, A, B contact of relay K 1 is normally opened contact, and namely coil needs control signal just meeting adhesive.First electric capacity C1 is the dc-link capacitance of frequency converter, and the voltage at the first electric capacity C1 two ends is the busbar voltage of frequency converter.When frequency converter powers on, because the power supply of frequency convertor system is not set up, the control coil of relay K 1 is in non operating state, and namely A, B contact of relay K 1 disconnects.Optocoupler U2 is for exchanging input optocoupler, and when frequency converter powers on, input ac power is powered by giving the input of optocoupler U2 after the 3rd resistance R3 current limliting, makes the output triode conducting of optocoupler.As long as namely input has alternating voltage, the output of optocoupler U2 will keep conducting.Second resistance R2 is the gate pole charging resistor of power switch pipe Q1, and when busbar voltage has electricity, busbar voltage can be charged to the gate pole of power switch pipe Q1 by the second resistance R2, makes power switch pipe Q1 open-minded.
Because busbar voltage is zero when just powering on, the gate pole of power switch pipe Q1 does not have driving voltage, power switch pipe Q1 turns off, the series loop that input AC electricity is consisted of rectification module U1, the first resistance R1, the first diode D1 is charged to the first electric capacity C1 (namely bus energy storage filter capacitor), as shown in Figure 3, I 1 is wherein charging current.In charging process, busbar voltage raises gradually, and the second resistance R2 also begins to flow through electric current, but because optocoupler U2 keeps conducting, electric current on second resistance R2 all flows through the output triode of optocoupler U2, and the gate pole of power switch pipe Q1 keeps low level, and namely power switch pipe Q1 keeps turning off.Because the alternating current of input has zero crossing, namely can of short duration cut-off in the output of near zero-crossing point optocoupler U2, electric current on second resistance R2 will charge to the gate capacitance of power switch pipe Q1, gate voltage is made to increase, the effect of the second electric capacity C2 is the gate capacitance of increasing power switching tube Q1, makes the gate voltage exchanging input zero crossing power switch pipe Q1 remain on below cut-in voltage.
After power up completes, busbar voltage reaches stable, and each road power supply of frequency converter has been set up, and control system provides control signal, makes relay K 1 adhesive, i.e. A, B closing of contact.The bus current of system no longer flows through the series arm of the first resistance R1 and the first diode D1, but directly flows through relay main contacts.This completes the buffer starting process that powers on of frequency converter.
When frequency converter input power-off, the output triode cut-off of optocoupler U2, first electric capacity C1 is charged to the gate pole of the second electric capacity C2 and power switch pipe Q1 by the second resistance R2, when the gate voltage of power switch pipe Q1 is higher than cut-in voltage, power switch pipe Q1 conducting, the series loop electric discharge of the first electric capacity C1 by being made up of the second diode D2, the first resistance R1, power switch pipe Q1, the voltage on the first electric capacity C1 starts rapid decline, as shown in Figure 4, I2 is wherein discharging current.The effect of voltage stabilizing didoe Z1 is: when voltage of voltage regulation higher than voltage stabilizing didoe Z1 of the gate voltage of power switch pipe Q1, voltage stabilizing didoe Z1 conducting, thus the scope of the gate voltage clamper of power switch pipe Q1 a safety, prevent the gate pole over-voltage breakdown of power switch pipe Q1.
Time below the voltage drop on the first electric capacity C1 to the voltage of the second electric capacity C2, the series loop electric discharge of gate capacitance by being made up of the second resistance R2, the first resistance R1, power switch pipe Q1 of the second electric capacity C2 and power switch pipe Q1.Power switch pipe Q1 gate voltage starts to decline, and when dropping to below cut-in voltage, power switch pipe Q1 turns off, and the first electric capacity C1, the second electric capacity C2 are no longer discharged by the first resistance R1.Because cut-in voltage is generally lower than 10V, is now similar to and discharges completely, this completes the bus discharge process of frequency converter.
As preferably, the power switch pipe Q1 in the utility model can be chosen as IGBT pipe or power MOSFET tube as required.First resistance R1 adopts power resistor.
The utility model has the advantage of, by using a first resistance R1, when frequency converter input powers on, as the buffer starting resistance that powers on of frequency converter; Under frequency converter input during electricity, as the bus capacitor discharge resistance of frequency converter.It is relative to special discharge circuit, do not need additionally to increase power dissipation component, control circuit is simple, and cost is low and electric discharge working range is wide, the pooling feature that powers on of frequency converter can be realized, the quick discharge function of dc-link capacitance after frequency converter input power-off can be realized again.
Although describe execution mode of the present utility model by reference to the accompanying drawings; but patent owner can make various distortion or amendment within the scope of the appended claims; as long as be no more than the protection range described by claim of the present utility model, all should within protection range of the present utility model.
Claims (3)
1. a frequency converter powers on and cushions and bus discharge circuit, comprise rectification module (U1), the first resistance (R1), relay (K1) and the first electric capacity (C1), it is characterized in that, also comprise optocoupler (U2), the second electric capacity (C2), the second resistance (R2), the 3rd resistance (R3), the first diode (D1), the second diode (D2), the first voltage-stabiliser tube (Z1) and power switch pipe (Q1)
Wherein, the input of described optocoupler (U2) is connected with alternating current by the 3rd resistance (R3), its output collector electrode is connected with the gate pole of power switch pipe (Q1), and its output emitter is connected with the negative electrode of power switch pipe (Q1);
Between the gate pole that described second electric capacity (C2) is connected to power switch pipe (Q1) and negative electrode, described first voltage-stabiliser tube (Z1) and the second electric capacity (C2) are in parallel;
Described second resistance (R2) is connected between the gate pole of power switch pipe (Q1) and the positive pole of the first electric capacity (C1);
The anode of described first diode (D1) is connected with the first resistance (R1), and its negative electrode is connected with the positive pole of the first electric capacity (C1);
Described second diode (D2) and relay (K1) are in parallel, and the anode of described power switch pipe (Q1) is connected with the anode of the first diode (D1).
2. frequency converter according to claim 1 powers on and cushions and bus discharge circuit, it is characterized in that, described power switch pipe (Q1) is IGBT pipe or power MOSFET tube.
3. frequency converter according to claim 1 powers on and cushions and bus discharge circuit, and it is characterized in that, described first resistance (R1) is power resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520383134.6U CN204669215U (en) | 2015-06-05 | 2015-06-05 | A kind of frequency converter powers on and cushions and bus discharge circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520383134.6U CN204669215U (en) | 2015-06-05 | 2015-06-05 | A kind of frequency converter powers on and cushions and bus discharge circuit |
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| CN204669215U true CN204669215U (en) | 2015-09-23 |
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| CN201520383134.6U Active CN204669215U (en) | 2015-06-05 | 2015-06-05 | A kind of frequency converter powers on and cushions and bus discharge circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482892A (en) * | 2017-08-10 | 2017-12-15 | 华为技术有限公司 | Energy snubber circuit and current transformer |
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2015
- 2015-06-05 CN CN201520383134.6U patent/CN204669215U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482892A (en) * | 2017-08-10 | 2017-12-15 | 华为技术有限公司 | Energy snubber circuit and current transformer |
| CN107482892B (en) * | 2017-08-10 | 2020-01-10 | 华为技术有限公司 | Energy buffer circuit and converter |
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| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170712 Address after: High tech Industrial Development Zone, Guangzhou City, Guangdong province 510000 Science City Road No. 9 litchi Sanjing Innovation Park Patentee after: GUANGZHOU SANJING ELECTRIC CO., LTD. Address before: 510663 Guangzhou high tech Industrial Development Zone, Guangdong Science City, litchi Road, No. 9 Patentee before: Lu Xueming |