CN1428911A - Slowly-starting circuit of power factor correction circuit and its control device - Google Patents
Slowly-starting circuit of power factor correction circuit and its control device Download PDFInfo
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Abstract
The present invention relates to a slow-starting circuit for power factor correcting circuit and its control device. Said slow-starting circuit includes the following steps: rectifier tyristor, boost up inductor, boosting diode, electrolytic capacitor, thermistor, normally open relay and battery, etc. Said invention also provides their connection method.
Description
Technical field
The present invention relates to the slow startup and the control technology thereof of circuit of power factor correction, be specifically related to a kind of civil power input power factor that has concurrently and proofread and correct slow startup and the control thereof that the three-level output single-phase step-up power factor of (PFC) function and battery boost function is proofreaied and correct (Boost PFC) circuit.
Background technology
Figure 1 shows that the single phase boost pfc circuit that a kind of three level commonly used are exported, its annexation is: civil power input live wire L connects the A utmost point of rectification thyristor VT3, the K utmost point of VT3 connects the end of boost inductance L1, the D end of another termination master MOSFET pipe VT1 of L1 and the A utmost point of booster diode VD1, the K utmost point of VD1 connects the positive pole of electrochemical capacitor C1, the S end of VT1 and the negative pole of C1 all meet civil power input zero line N, and the positive pole of C1 is+DCBUS.In addition, civil power input live wire L also connects the K utmost point of rectification thyristor VT4, the A utmost point of VT4 connects the end of boost inductance L2, the S end of another termination master MOSFET pipe VT2 of L2 and the K utmost point of booster diode VD2, the A utmost point of VD2 connects the negative pole of electrochemical capacitor C2, the D end of VT2 and the positive pole of C2 all meet civil power input zero line N, and the negative pole of C2 is-DCBUS.+ DCBUS ,-DCBUS and N constitute the three level output of single phase boost pfc circuit.Wherein VT1, VT2 also can use IGBT, because of its annexation, very conveniently share an IGBT half-bridge module, and VD1, VD2 use Ultrafast recovery diode always.This kind circuit is widely used in communication power supply, induction heating power (afterwards connecing three level DC/DC converters) or the online bipolar conversion uninterrupted power supply (ups) Unity system (afterwards connecing three level DC/AC inverters) with three level intermediate dc links.
In ups system, this circuit often has civil power input PFC function and battery boost function concurrently, and the battery branch road of need introducing is connected across between the A utmost point (REC-) of the K utmost point (REC+) of VT3 and VT4 usually: the negative pole of BATTERY meets REC-, the positive pole of BATTERY connects the A utmost point of thyristor VT5, and the K utmost point of VT5 meets REC+.When VT3, VT4 conducting, when VT5 ends, be equivalent to the civil power input PFC operating state of UPS like this; When the VT5 conducting, VT3, VT4 by the time, the battery that the is equivalent to UPS operating state of boosting.This battery method of attachment connects battery than traditional UPS in the intermediate dc link, can reduce the voltage of battery, thereby reduce battery series connection number, do not need special battery booster circuit yet, therefore reduced cost, in online couple of conversion UPS of middle low power (because of single-phase import-restriction), obtained using widely.
This circuit is because have bigger capacitive load (C1, C2), if do not add soft start function, need civil power or battery that very big transient current is provided during startup, can cause bigger impact or battery is caused bigger infringement electrical network, also damage input switch easily, insurance, power device (the VD1 that is correlated with in the circuit, VD2, VT3 VT4), sums up the slow startup method of existing power circuit, the following method of general employing: resistance or thermistor controllable devices in parallel is (as relay, thyristor, MOSFET), be connected in the input circuit, by the resistance current limliting, the conducting controllable devices reduced the wastage after startup was finished during startup.Sometimes, the resistance relay of connecting again, turn-on relay during startup starts and finishes back conducting controllable devices and disconnect relay, with the increase system reliability.This method simple general-purpose, but need outside power circuit, increase soft-start circuit again, and be connected in the input circuit, increased cost, reduced the efficient and the reliability of system.
Mentioned in U.S. Pat 6009008 " Soft strat bridge rectifier circuit " and do not increase extra soft-start circuit, the trigger impulse of directly controlling thyristor is realized the slow startup of AC/DC rectifier bridge.The interchange that this patent is fit to have nature to cross flow point is imported, and mainly is rectification circuit, but is not suitable for the input of battery direct current.
Summary of the invention
Technical problem to be solved by this invention is to overcome shortcoming described in the prior art, and a kind of soft-start circuit and control device thereof of three level output single phase boost pfc circuit is provided.
The soft-start circuit of the three level output single phase boost pfc circuit that the present invention proposes: civil power input live wire L connects the A utmost point of rectification thyristor VT3, the K utmost point of VT3 connects the D end of main MOSFET pipe VT1 and the A utmost point of booster diode VD1 through boost inductance L1, the K utmost point of VD1 connects the positive pole of electrochemical capacitor C1, the S end of VT1 and the negative pole of C1 all meet civil power input zero line N, and the positive pole of C1 is+DCBUS; Civil power input live wire L also connects the K utmost point of rectification thyristor VT4, the A utmost point of VT4 connects the S end of main MOSFET pipe VT2 and the K utmost point of booster diode VD2 through boost inductance L2, the A utmost point of VD2 connects the negative pole of electrochemical capacitor C2, the D end of VT2 and the positive pole of C2 all meet civil power input zero line N, the negative pole of C2 is-DCBUS, the negative pole of battery BATTERY connects the A utmost point of VT4, and the positive pole of BATTERY connects the A utmost point of thyristor VT5, and the K utmost point of VT5 connects the K utmost point of VT3; It is characterized in that increasing a branch road that is parallel to the negative tempperature coefficient thermistor RT1 string normally opened relay K1 of thyristor VT5.Make and civil power input soft start function is arranged existing battery input soft start function again.
The control device that the present invention proposes the soft-start circuit of circuit of power factor correction comprises: the soft-start circuit of described three level Boost pfc circuits, signal sample circuit, systems control division branch, Boost PFC control circuit, driving circuit section; Signal sample circuit obtains importing mains waveform and voltage signal, battery voltage signal, boost inductance current signal, output voltage signal from the soft-start circuit of described three level Boost pfc circuits; Signal and predefined control mode that the systems control division root division number of it is believed that sample circuit is sent here are sent the drive signal of each switching device in the soft-start circuit of described three level Boost pfc circuits, control its operate as normal (starting comprising slow); Boost PFC control circuit, the signal of sending here according to signal sample circuit is controlled the VT1 in the soft-start circuit of three level Boost pfc circuits, the drive signal of VT2 by special-purpose PFC control chip UC3854, make the soft-start circuit of three level Boost pfc circuits possess civil power PFC or battery boost function, and having the output voltage stabilizing, functions such as power and current-limiting protection are limit in input; Driving circuit section is accepted systems control division and is divided 303 and the drive signal sent here of Boost PFC control circuit, drives the corresponding device in the soft-start circuit of Boost pfc circuit.
The invention enables the single phase boost pfc circuit of the three level output that has civil power input PFC function and battery boost function concurrently can effectively delay startup, avoid electrical network is caused bigger impact or battery is caused bigger infringement, avoid damaging in the start-up course power device relevant in input switch, insurance, the circuit, on the basis that increases hardware cost hardly, increased the reliability of system.
Description of drawings
Fig. 1 is the single phase boost pfc circuit that a kind of three level commonly used are exported.
Fig. 2 is the single phase boost PFC soft-start circuit of the three level output that proposes of the present invention.
Fig. 3 is the control device of the single phase boost PFC soft-start circuit of the three level output that proposes of the present invention.
Fig. 4 is that control device of the present invention is realized that battery is slow and started and related device switching sequence figure and+DCBUS voltage waveform view during the slow indirectly start-up control of civil power.
Fig. 5 related device switching sequence figure that is control device of the present invention when realizing the directly slow control that starts of civil power input and+the DCBUS voltage waveform view.
Embodiment
Fig. 1 partly illustrates in background technology.
Fig. 2 is the single phase boost PFC soft-start circuit of the three level output that proposes of the present invention, on the basis of Fig. 1, increased a branch road that is parallel to the negative tempperature coefficient thermistor RT1 string normally opened relay K1 of thyristor VT5 and made civil power input soft start function is arranged existing battery input soft start function again.
Fig. 3 is the control device of the single phase boost PFC soft-start circuit of the three level output that proposes of the present invention; Soft-start circuit 301, signal sample circuit 302, the systems control division that comprises three level Boost pfc circuits divides 303, Boost PFC control circuit 304, driving circuit section 305; Wherein, the soft-start circuit 301 of described three level Boost pfc circuits is the single phase boost PFC soft-start circuit of three level shown in Figure 2 output, and signal sample circuit 302 obtains importing mains waveform and voltage signal, battery voltage signal, boost inductance current signal, output voltage signal from the soft-start circuit 301 of described three level Boost pfc circuits; Systems control division divides 303 signal and the predefined control modes of sending here according to signal sample circuit 302, send the drive signal of each switching device in the soft-start circuit 301 of described three level Boost pfc circuits, control its operate as normal (starting) comprising slow; Boost PFC control circuit 304, the signal of sending here according to signal sample circuit 302 is controlled the VT1 in the soft-start circuit of three level Boost pfc circuits, the drive signal of VT2 by special-purpose PFC control chip UC3854, make the soft-start circuit 301 of three level Boost pfc circuits possess civil power PFC or battery boost function, and having the output voltage stabilizing, functions such as power and current-limiting protection are limit in input; Driving circuit section 305 is accepted systems control division and is divided 303 and the drive signal sent here of Boost PFC control circuit 304, drives the VT1 in the soft-start circuit 301 of Boost pfc circuit, VT2, VT3, VT3, VT5, K1; Systems control division divides 303 can be made of digital signal processor (DSP) and microprogram control unit programming devices such as (MCU), has brought very big flexibility for the control of system.
Be directed to the different of system battery and civil power configuring condition, control device of the present invention divides the slow Starting mode of the soft-start circuit 301 that has preestablished three kind of three level Boost pfc circuit in 303 to select at systems control division: mode one has battery corresponding to system, cell voltage is the situation in the scope of system requirements also, is referred to as the slow Starting mode of battery; Mode two has civil power again corresponding to the existing battery of system, and the battery line voltage is the situation in the scope of system requirements all, is referred to as the slow indirectly Starting mode of civil power; Mode three only has civil power (line voltage is in the scope of system requirements) corresponding to system, does not have the not situation in the scope of system requirements of battery or cell voltage, is referred to as the directly slow Starting mode of civil power.Various slow start-up control modes all comprise two stages: at first being that battery inserts or the charging to C1, C2 is inserted in the commercial power rectification, is that Boost boosts then; Wherein first stage divides 303 to finish by systems control division, and second stage divides 303 parts to start Boost PFC control circuit 304 by systems control division, finished by Boost PFC control circuit 304; Because Boost PFC control circuit 304 chips UC3854 are from the tool soft start function, the process of boosting speed is connect the slow capacitance size decision that starts by the SS end institute of chip UC3854, and when this capacitance size designs when suitable, second stage does not have bigger impulse current.Therefore, the slow startup implementation of phase I is described emphatically below.
Fig. 4 is that control device of the present invention is realized that battery is slow and started and related device switching sequence figure and+DCBUS voltage waveform view during the slow indirectly start-up control of civil power: among the figure+and the slow rising of DCBUS voltage segmentation can characterize soft start-up process, [t0 wherein, t3] period is battery input slow the startup stage: t0 described control device constantly starts working, divide normally opened relay K1 among 303 conducting Fig. 2 by systems control division, battery pack BATTERY is by the thermistor RT1 among Fig. 2, normally opened relay K1, inductance L 1, booster diode VD1, electrochemical capacitor C1, C2, booster diode VD2, inductance L 2 constitutes the loop and gives C1, the C2 charging, and charging current is limited by the resistance of cell voltage and RT1, select the resistance of suitable RT1 for use, do not have bigger impulse current; When the follow-up link (DC/DC converter or DC/AC inverter) of soft-start circuit 301 when not starting (this point generally satisfies), do not need the normally opened relay K1 and the thermistor RT1 of big current class yet; After charging is finished, electrochemical capacitor C1, C2 terminal voltage are the cell voltage of half, after systems control division divides 303 input by signal sample circuit 302 to finish to charging, in t1 conducting constantly thyristor VT5, turn-off normally opened relay K1, by the main channel of thyristor VT5, and start Boost PFC control circuit 304, enter the slow second stage that starts as battery current; Continue to rise by Boost PFC control circuit 304 control electrochemical capacitor C1, C2 terminal voltage, be raised to needed DC bus-bar voltage constantly in t3.Though this mode is similar with usual way described in the background technology, because VT5 was exactly the part of circuit originally, so the unnecessary device of in main circuit, not connecting, do not influence the efficient and the reliability of circuit, its advantage is that control is simple, K1, and the capacity of RT1 is also very little.
[t0 among Fig. 4, t4] period is the indirectly slow start-up control mode of civil power input: [t0, t3] period is ditto described, t3 constantly back circuit enters the battery mode of operation of boosting, when systems control division divides 303 to pass through the input of signal sample circuit 302 to this point, and judge that the civil power input is in the scope that system allows, provide the drive signal of rectification thyristor VT3 and VT4 constantly at t4, and cancel the drive signal of VT5 simultaneously, circuit will carry out the transition to civil power PFC mode of operation, need Boost PFC control circuit parameter designing appropriate, make that the boost transition of mode of operation and civil power PFC mode of operation of battery is steady, though need battery to participate in slow the startup, do not increase extra device, and control simple and reliable.
Fig. 5 related device switching sequence figure that is control device of the present invention when realizing the directly slow control that starts of civil power input and+the DCBUS voltage waveform view: [t0, t1] the phased method conducting rectification thyristor VT3 of period employing, VT4, conduction angle progressively is increased to 90 ° by 0 °, + DCBUS will progressively rise to 1.3 times input line voltage effective value,-DCBUS is as the same, select different step numbers, civil power input impulse current varies in size, step number is many more, impact more little, select suitable step number to meet the demands, after conduction angle＞90 °, can select for use less step number to rapidly increase to 180 °, make VT3, VT4 is complete conducting when civil power input positive-negative half-cycle respectively.After the complete conducting of VT3, VT4, enter second stage, the same.Non-half the cell voltage of this moment+DCBUS voltage just, but 1.3 times input line voltage effective value.Usually, half cell voltage of this voltage ratio is much higher, and is corresponding, also little many to the slow pressure that starts of second stage.This process control more complicated, but provide a kind of a kind of slow start-up control scheme that does not have battery or cell voltage to cross circuit when hanging down, can be used for system debug and self check, and can reduce battery consumption, also can be used for the recovery (civil power starts the back and makes it to recover for the battery charge of overdischarge) of system when battery over-discharge, and have the described United States Patent (USP) of background technology " Soft strat bridge rectifiercircuit " and do not increase extra soft-start circuit, the trigger impulse of directly controlling thyristor is realized the advantage of the slow startup of AC/DC rectifier bridge; Because systems control division divides 303 by DSP and MCU realization, has improved the flexibility of the controlling schemes realization of system, has avoided numerous and jumbled hardware control circuit simultaneously.
No matter the invention enables is that civil power or battery are only arranged, or existing civil power has the single phase boost pfc circuit of the three level output of battery can both effectively delay startup again, avoid electrical network is caused bigger impact or battery is caused bigger infringement, avoid damaging in the start-up course power device (VD1 relevant in input switch, insurance, the circuit, VD2, VT3, VT4), on the basis that increases hardware cost hardly, increased the reliability of system.The present invention both can be applied to also can be applied in the power supplys such as communication power supply, induction heating power in the online bipolar conversion ups system.
Claims (2)
1, a kind of soft-start circuit of circuit of power factor correction, comprise: civil power input live wire L connects the A utmost point of rectification thyristor VT3, the K utmost point of VT3 connects the D end of main MOSFET pipe VT1 and the A utmost point of booster diode VD1 through boost inductance L1, the K utmost point of VD1 connects the positive pole of electrochemical capacitor C1, the S end of VT1 and the negative pole of C1 all meet civil power input zero line N, and the positive pole of C1 is+DCBUS; Civil power input live wire L also connects the K utmost point of rectification thyristor VT4, the A utmost point of VT4 connects the S end of main MOSFET pipe VT2 and the K utmost point of booster diode VD2 through boost inductance L2, the A utmost point of VD2 connects the negative pole of electrochemical capacitor C2, the D end of VT2 and the positive pole of C2 all meet civil power input zero line N, the negative pole of C2 is-DCBUS, the negative pole of battery BATTERY connects the A utmost point of VT4, the positive pole of BATTERY connects the A utmost point of thyristor VT5, the K utmost point of VT5 connects the K utmost point of VT3, it is characterized in that also comprising a branch road that is parallel to the negative tempperature coefficient thermistor RT1 string normally opened relay K1 of thyristor VT5.
2, a kind of control device of soft-start circuit of circuit of power factor correction comprises: the soft-start circuit of three level Boost pfc circuits (301), signal sample circuit (302), systems control division branch (303), Boost PFC control circuit (304), driving circuit section (305); Signal sample circuit (302) obtains importing mains waveform and voltage signal, battery voltage signal, boost inductance current signal, output voltage signal from the soft-start circuit (301) of described three level Boost pfc circuits; Signal and predefined control mode that systems control division branch (303) is sent here according to signal sample circuit (302) are sent the drive signal of each switching device in the soft-start circuit (301) of described three level Boost pfc circuits, control its operate as normal; Drive signal in the soft-start circuit (301) of the signal controlling three level Boost pfc circuits that Boost PFC control circuit (304) is sent here according to signal sample circuit (302), make the soft-start circuit of three level Boost pfc circuits possess civil power PFC or battery boost function, and having the output voltage stabilizing, functions such as power and current-limiting protection are limit in input; Driving circuit section (305) is accepted the drive signal that systems control division branch (303) and Boost PFC control circuit (304) are sent here, drives the corresponding device in the soft-start circuit (301) of Boost pfc circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB01145394XA CN100338843C (en) | 2001-12-27 | 2001-12-27 | Slowly-starting circuit of power factor correction circuit and its control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB01145394XA CN100338843C (en) | 2001-12-27 | 2001-12-27 | Slowly-starting circuit of power factor correction circuit and its control device |
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| CN1428911A true CN1428911A (en) | 2003-07-09 |
| CN100338843C CN100338843C (en) | 2007-09-19 |
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| CNB01145394XA Expired - Fee Related CN100338843C (en) | 2001-12-27 | 2001-12-27 | Slowly-starting circuit of power factor correction circuit and its control device |
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| CN101789688A (en) * | 2010-04-02 | 2010-07-28 | 天津大学 | Value selecting method for boost inductance of three-level Boost converter |
| CN102611295A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Power factor corrector |
| CN103117651A (en) * | 2013-02-06 | 2013-05-22 | 上海儒竞电子科技有限公司 | Thermistor-based three-phase rectifier soft power on circuit |
| CN103401441A (en) * | 2013-07-25 | 2013-11-20 | 深圳市易能电气技术有限公司 | Rectification filter circuit and starting method thereof |
| CN103595235A (en) * | 2013-10-29 | 2014-02-19 | 江苏绿扬电子仪器集团有限公司 | Preceding stage protection system of inverter |
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| CN104734122A (en) * | 2013-12-20 | 2015-06-24 | 艾默生网络能源有限公司 | Capacitor overvoltage protection circuit and power supply |
| CN104868716A (en) * | 2014-02-20 | 2015-08-26 | 艾默生网络能源有限公司 | Boost converter |
| CN106656129A (en) * | 2016-12-21 | 2017-05-10 | 贵州振华群英电器有限公司（国营第八九厂） | DC soft start solid state relay |
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| CN112821774A (en) * | 2021-02-02 | 2021-05-18 | 深圳弘德智能有限公司 | Converter |
| CN115129106A (en) * | 2022-08-31 | 2022-09-30 | 深圳市倍轻松科技股份有限公司 | Heating circuit, control method, chip, electronic equipment and massager |
| CN115129106B (en) * | 2022-08-31 | 2023-11-21 | 深圳市倍轻松科技股份有限公司 | Heating circuit, control method, chip, electronic equipment and massager |
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| CN100338843C (en) | 2007-09-19 |
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