CN104868708A - Power-on buffering and bus discharge circuit for frequency converter - Google Patents
Power-on buffering and bus discharge circuit for frequency converter Download PDFInfo
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- CN104868708A CN104868708A CN201510303931.3A CN201510303931A CN104868708A CN 104868708 A CN104868708 A CN 104868708A CN 201510303931 A CN201510303931 A CN 201510303931A CN 104868708 A CN104868708 A CN 104868708A
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Abstract
The invention discloses a power-on buffering and bus discharge circuit for a frequency converter, and the circuit comprises a rectification module, a first resistor, a relay, a first capacitor, an optical coupler, a second capacitor, a second resistor, a third resistor, a first diode, a second diode, a first voltage-stabilizing tube, and a power switching tube. The input end of the optical coupler is connected with an alternating current through the third resistor. The output end collector electrode of the optical coupler is connected with the gate of the power switching tube, and the output end emitter electrode of the optical coupler is connected with the cathode of the power switching tube. The second capacitor is connected between the gate and cathode of the power switching tube, and the first voltage-stabilizing tube is in parallel connection with the second capacitor. The second resistor is connected between the gate of the power switching tube and the positive electrode of the first capacitor. The anode of the first diode is connected with the first resistor, and the cathode of the first diode is connected with the negative electrode of the first capacitor. The second diode is in parallel connection with the relay, and the anode of the power switching tube is connected with the anode of the first diode. The circuit can achieve the power-on buffering, and also can achieve the quick discharging of a DC bus capacitor after power failure.
Description
Technical field
The present invention relates to converter technology field, 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.
Summary of the invention
The object of the present invention is to provide a kind of frequency converter to power on buffering and bus discharge circuit, 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 used in the present invention 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 invention has the advantages that: the present invention 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 embodiment of the present invention 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 some embodiments of the present invention, 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 of the present invention powers on buffering and the circuit diagram of bus discharge circuit.
Fig. 3 be frequency converter of the present invention power on buffering and bus discharge circuit charge time current direction figure.
Fig. 4 be frequency converter of the present invention power on buffering and bus discharge circuit discharge time current direction figure.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Consult shown in Fig. 2, the invention provides a kind of frequency converter power on buffering 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 present invention, 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 present invention, 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 present invention can be chosen as IGBT pipe or power MOSFET tube as required.First resistance R1 adopts power resistor.
The invention has the advantages that, 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 embodiments of the present invention 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 invention, all should within protection scope of the present invention.
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 |
|---|---|---|---|
| CN201510303931.3A CN104868708A (en) | 2015-06-05 | 2015-06-05 | Power-on buffering and bus discharge circuit for frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510303931.3A CN104868708A (en) | 2015-06-05 | 2015-06-05 | Power-on buffering and bus discharge circuit for frequency converter |
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| CN104868708A true CN104868708A (en) | 2015-08-26 |
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| CN201510303931.3A Pending CN104868708A (en) | 2015-06-05 | 2015-06-05 | Power-on buffering and bus discharge circuit for frequency converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623478A (en) * | 2017-10-24 | 2018-01-23 | 深圳市大地和电气股份有限公司 | A kind of electric machine controller charge/discharge control circuit for meeting functional safety |
| CN108134514A (en) * | 2017-12-25 | 2018-06-08 | 北京精密机电控制设备研究所 | Power MOS pipe lets out discharge protection circuit in a kind of inverter circuit |
| CN109327934A (en) * | 2018-10-22 | 2019-02-12 | 横店集团得邦照明股份有限公司 | A kind of capacitor quick discharging circuit and its implementation |
| CN111475432A (en) * | 2020-04-08 | 2020-07-31 | 北京中科银河芯科技有限公司 | Slave starting control device, single bus system and control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191394A (en) * | 1997-02-20 | 1998-08-26 | 杨泰和 | Insulated-gate bipolar transistor driven by pre-photo-electric transfer component |
| JP3572915B2 (en) * | 1997-12-16 | 2004-10-06 | 三菱電機株式会社 | A control circuit having an inrush current prevention function, an overvoltage prevention function, and a discharge function, and a power converter including the control circuit |
| CN202586329U (en) * | 2012-05-25 | 2012-12-05 | 深圳市中兴昆腾有限公司 | Self-discharge circuit |
| CN204031002U (en) * | 2014-09-02 | 2014-12-17 | 深圳茂硕电气有限公司 | Capacitor discharging circuit in a kind of photovoltaic DC-to-AC converter |
-
2015
- 2015-06-05 CN CN201510303931.3A patent/CN104868708A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191394A (en) * | 1997-02-20 | 1998-08-26 | 杨泰和 | Insulated-gate bipolar transistor driven by pre-photo-electric transfer component |
| JP3572915B2 (en) * | 1997-12-16 | 2004-10-06 | 三菱電機株式会社 | A control circuit having an inrush current prevention function, an overvoltage prevention function, and a discharge function, and a power converter including the control circuit |
| CN202586329U (en) * | 2012-05-25 | 2012-12-05 | 深圳市中兴昆腾有限公司 | Self-discharge circuit |
| CN204031002U (en) * | 2014-09-02 | 2014-12-17 | 深圳茂硕电气有限公司 | Capacitor discharging circuit in a kind of photovoltaic DC-to-AC converter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623478A (en) * | 2017-10-24 | 2018-01-23 | 深圳市大地和电气股份有限公司 | A kind of electric machine controller charge/discharge control circuit for meeting functional safety |
| CN108134514A (en) * | 2017-12-25 | 2018-06-08 | 北京精密机电控制设备研究所 | Power MOS pipe lets out discharge protection circuit in a kind of inverter circuit |
| CN109327934A (en) * | 2018-10-22 | 2019-02-12 | 横店集团得邦照明股份有限公司 | A kind of capacitor quick discharging circuit and its implementation |
| CN109327934B (en) * | 2018-10-22 | 2024-01-23 | 横店集团得邦照明股份有限公司 | Capacitor rapid discharging circuit and implementation method thereof |
| CN111475432A (en) * | 2020-04-08 | 2020-07-31 | 北京中科银河芯科技有限公司 | Slave starting control device, single bus system and control method thereof |
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Application publication date: 20150826 |
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