CN100338843C - 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 slowly-starting circuit of a power factor correction circuit and control device thereof, wherein the slowly-starting circuit comprises a commercial power input fire wire L which is connected with an electrode A of a rectifying thyristor VT3, an electrode K of the VT3 is connected with the D end of a main MOSFET pipe VT1 and an electrode A of a booster diode VD1 through a boost inductor L1, an electrode K of VD1 is connected with a positive electrode of an electrolytic condenser C1, the S end of VT1 and a negative electrode of C1 are connected with a commercial power input zero wire N, and the positive electrode of C1 is +DCBUS; the commercial power input fire wire L is also connected with an electrode K of a rectifying thyristor VT4, an electrode A of the VT4 is connected with the S end of a main MOSFET pipe VT2 and an electrode K of a booster diode VD2 through a boost inductor L2, an electrode A of VD2 is connected with a negative electrode of an electrolytic condenser C2, the D end of VT2 and a positive electrode of C2 are connected with the commercial power input zero wire N, the negative electrode of C2 is-DCBUS, a negative electrode of a battery BATTERY is connected with the electrode A of VT4, a positive electrode of BATTERY is connected with an electrode A of a thyristor VT5, and an electrode K of VT5 is connected with the electrode K of VT3. The slowly-starting circuit is characterized in that a branch circuit which is connected in parallel with a serial normally open relay K1 of a negative temperature coefficient thermistor RT1 of the thyristor VT5, and the slowly-starting circuit has the functions of battery input and slow starting of commercial power input.
Description
Technical field
The present invention relates to the soft start 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 soft start 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 anode (the A utmost point) of rectification thyristor VT3, the negative electrode of rectification thyristor VT3 (the K utmost point) connects the end of boost inductance L1, the drain electrode (D end) of another termination master metal oxide semiconductor field effect transistor (MOSFET) pipe VT1 of L1 and the A utmost point of booster diode VD1, the K utmost point of booster diode VD1 connects the positive pole of electrochemical capacitor C1, the source electrode (S end) of main MOSFET pipe VT1 and the negative pole of electrochemical capacitor C1 all connect civil power and import zero line N, the positive pole of C1 be anodal dc bus (+DCBUS).In addition, civil power input live wire L also connects the K utmost point of rectification thyristor VT4, the A utmost point of rectification thyristor 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 main MOSFET pipe VT2 and the positive pole of electrochemical capacitor C2 all meet civil power input zero line N, and the negative pole of electrochemical capacitor C2 is the negative pole dc bus (DCBUS).+ DCBUS ,-DCBUS and N constitute the three level output of single phase boost pfc circuit.Wherein main MOSFET pipe VT1, main MOSFET pipe VT2 also can use IGBT, because of its annexation, very conveniently share an IGBT half-bridge module, and booster diode VD1, booster diode 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 rectification thyristor VT3 and rectification thyristor 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 thyristor VT5 meets REC+.When rectification thyristor VT3, rectification thyristor VT4 conducting, when thyristor VT5 ends, be equivalent to the civil power input PFC operating state of UPS like this; When thyristor VT5 conducting, rectification thyristor 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 (electrochemical capacitor 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 booster diode VD1 that is correlated with in the circuit, booster diode VD2, rectification thyristor VT3, rectification thyristor VT4), sum up the soft-start 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 starting 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 starting circuit, the trigger impulse of directly controlling thyristor is realized the soft start 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 starting circuit and control device thereof of three level output single phase boost pfc circuit is provided.
The soft starting 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 rectification thyristor 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 booster diode VD1 connects the positive pole of electrochemical capacitor C1, the S end of main MOSFET pipe VT1 and the negative pole of electrochemical capacitor C1 all meet civil power input zero line N, and the positive pole of electrochemical capacitor C1 is+DCBUS; Civil power input live wire L also connects the K utmost point of rectification thyristor VT4, the A utmost point of rectification thyristor 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 booster diode VD2 connects the negative pole of electrochemical capacitor C2, the D end of main MOSFET pipe VT2 and the positive pole of electrochemical capacitor C2 all meet civil power input zero line N, the negative pole of electrochemical capacitor C2 is-DCBUS, the negative pole of battery connects the A utmost point of rectification thyristor VT4, the positive pole of battery connects the A utmost point of thyristor VT5, and the K utmost point of thyristor VT5 connects the K utmost point of rectification thyristor 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, the work of the described normally opened relay K1 of signal controlling, rectification thyristor VT3, rectification thyristor VT4 and thyristor VT5 that the soft starting circuit of described circuit of power factor correction is collected according to this control device by a control device, and control the work of main MOSFET pipe VT1 and main MOSFET pipe VT2.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 starting circuit of circuit of power factor correction comprises: the soft starting 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 starting 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, send the drive signal of normally opened relay K1, rectification thyristor VT3, rectification thyristor VT4 and thyristor VT5 in the soft starting circuit of described three level Boost pfc circuits, control its operate as normal (comprising soft start); Boost PFC control circuit, the signal of sending here according to signal sample circuit is controlled the drive signal of main MOSFET pipe VT1, VT2 in the soft starting circuit of three level Boost pfc circuits by special-purpose PFC control chip UC3854, make the soft starting 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 the drive signal that systems control division divides and Boost PFC control circuit is sent here, the corresponding device in the soft starting circuit of driving 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 carry out soft start, 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 starting 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 starting circuit of the three level output that proposes of the present invention.
Fig. 4 be control device of the present invention when realizing the indirect soft start control of battery soft start and civil power related device switching sequence figure and+the DCBUS voltage waveform view.
Fig. 5 related device switching sequence figure that is control device of the present invention when realizing that civil power is imported the control of direct soft start and+the DCBUS voltage waveform view.
Embodiment
Fig. 1 partly illustrates in background technology.
Fig. 2 is the single phase boost PFC soft starting 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 starting circuit of the three level output that proposes of the present invention; Soft starting 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 starting circuit 301 of described three level Boost pfc circuits is the single phase boost PFC soft starting 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 starting 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 switching device rectification thyristor VT3, rectification thyristor VT4, thyristor VT5, normally opened relay K1 in the soft starting circuit 301 of described three level Boost pfc circuits, control its operate as normal (comprising soft start); Boost PFC control circuit 304, the signal of sending here according to signal sample circuit 302 is controlled the drive signal of main MOSFET pipe VT1, the main MOSFET pipe VT2 in the soft starting circuit of three level Boost pfc circuits by special-purpose PFC control chip UC3854, make the soft starting 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, accept systems control division and divide 303 and the drive signal sent here of Boost PFC control circuit 304, main MOSFET pipe VT1 in the soft starting circuit 301 of driving Boost pfc circuit, main MOSFET pipe VT2, rectification thyristor VT3, rectification thyristor VT4, thyristor VT5, normally opened relay 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 soft starting mode of the soft starting 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 battery soft start mode; 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 indirect soft 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 direct soft starting mode of civil power.Various soft start control modes all comprise two stages: at first be that battery inserts or the charging to electrochemical capacitor C1, electrochemical capacitor C2 is inserted in the commercial power rectification, boost 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 by the SS end institute soft start capacitor that the connects size decision of chip UC3854, and when this capacitance size designs when suitable, second stage does not have bigger impulse current.Therefore, the soft start implementation of phase I is described emphatically below.
Fig. 4 be control device of the present invention when realizing the indirect soft start control of battery soft start and civil power related device switching sequence figure and+the DCBUS voltage waveform view: among the figure+the slow rising of DCBUS voltage segmentation can characterize soft start-up process, [t0 wherein, t3] period be battery input soft start stage: t0 constantly described control device start working, divide normally opened relay K1 among 303 conducting Fig. 2 by systems control division, 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 electrochemical capacitor C1, the C2 charging, and charging current is limited by the resistance of cell voltage and thermistor RT1, select the resistance of suitable temperature-sensitive resistance R T1 for use, do not have bigger impulse current; When the follow-up link (DC/DC converter or DC/AC inverter) of soft starting 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, the second stage that enters soft start 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, but because thyristor VT5 was exactly the part of circuit originally, the unnecessary device so in main circuit, do not connect, do not influence the efficient and the reliability of circuit, its advantage is that control is simple, normally opened relay K1, the capacity of thermistor RT1 is also very little.
[t0 among Fig. 4, t4] period is that civil power is imported indirect soft start control mode: [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 thyristor 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 soft start, 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 that civil power is imported the control of direct soft start 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 rectification thyristor VT3, VT4 is complete conducting when civil power input positive-negative half-cycle respectively.After rectification thyristor VT3, the complete conducting of 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 pressure of second stage soft start.This process control more complicated, but provide a kind of a kind of soft start controlling schemes 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 starting circuit, the trigger impulse of directly controlling thyristor is realized the advantage of the soft start 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 carry out soft start again, avoid electrical network is caused bigger impact or battery is caused bigger infringement, avoid damaging in the start-up course power device (booster diode VD1 relevant in input switch, insurance, the circuit, booster diode VD2, rectification thyristor VT3, rectification thyristor 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 (5)
1, a kind of soft starting circuit of circuit of power factor correction, comprise: civil power input live wire (L) connects the anode of the 3rd rectification thyristor (VT3), the negative electrode of the 3rd rectification thyristor (VT3) connects the drain electrode of the first main mos field effect transistor (VT1) and the anode of first booster diode (VD1) through first boost inductance (L1), the negative electrode of first booster diode (VD1) connects the positive pole of first electrochemical capacitor (C1), the negative pole of the source electrode of the first main mos field effect transistor (VT1) and first electrochemical capacitor (C1) all connects civil power input zero line (N), and the positive pole of first electrochemical capacitor (C1) is anodal dc bus; Civil power input live wire (L) also connects the negative electrode of the 4th rectification thyristor (VT4), the anode of the 4th rectification thyristor (VT4) connects the source electrode of the second main mos field effect transistor (VT2) and the negative electrode of second booster diode (VD2) through second boost inductance (L2), the anode of second booster diode (VD2) connects the negative pole of second electrochemical capacitor (C2), the positive pole of the drain electrode of the second main mos field effect transistor (VT2) and second electrochemical capacitor (C2) all connects civil power input zero line (N), the negative pole of second electrochemical capacitor (C2) is the negative pole dc bus, the negative pole of battery connects the anode of the 4th rectification thyristor (VT4), the positive pole of battery connects the anode of the 5th thyristor (VT5), the negative electrode of the 5th thyristor (VT5) connects the negative electrode of the 3rd rectification thyristor (VT3), it is characterized in that, also comprise a branch road that is parallel to negative tempperature coefficient thermistor (RT1) the string normally opened relay (K1) of the 5th thyristor (VT5), the described normally opened relay of signal controlling (K1) that the soft starting circuit of described circuit of power factor correction is collected according to this control device by a control device, the 3rd rectification thyristor (VT3), the work of the 4th rectification thyristor (VT4) and the 5th thyristor (VT5), and control the work of the first main mos field effect transistor (VT1) and the second main mos field effect transistor (VT2).
2, the soft starting circuit of circuit of power factor correction according to claim 1, it is characterized in that, the described normally opened relay of conducting (K1), described battery is by described thermistor (RT1), normally opened relay (K1), first boost inductance (L1), first booster diode (VD1), first electrochemical capacitor (C1), second electrochemical capacitor (C2), second booster diode (VD2), second boost inductance (L2) constitute the loop and give first electrochemical capacitor (C1), second electrochemical capacitor (C2) charging; After charging was finished, conducting the 5th thyristor (VT5) turn-offed normally opened relay (K1); Described control device is controlled first electrochemical capacitor (C1), second electrochemical capacitor (C2) terminal voltage continues to rise, and is raised to needed DC bus-bar voltage.
3, the soft starting circuit of circuit of power factor correction according to claim 2, it is characterized in that, when described first electrochemical capacitor (C1), second electrochemical capacitor (C2) terminal voltage is raised to after the needed DC bus-bar voltage soft starting circuit and enters the battery mode of operation of boosting, when described control device judges that the civil power input is in the scope that system allows, described control device provides described the 3rd rectification thyristor (VT3), the drive signal of the 4th rectification thyristor (VT4), and cancel the drive signal of described the 5th thyristor (VT5) simultaneously, described soft starting circuit carries out the transition to civil power power factor correction mode of operation.
4, the soft starting circuit of circuit of power factor correction according to claim 1, it is characterized in that, described the 3rd rectification thyristor (VT3) of conducting and the 4th rectification thyristor (VT4), the angle of flow progressively is increased to 90 ° by 0 °, described anodal dc bus will progressively rise to 1.3 times input line voltage effective value, described negative pole dc bus is as the same, select suitable step number, after the angle of flow is greater than 90 °, select for use less step number to rapidly increase to 180 °, make the complete conducting when civil power input positive-negative half-cycle respectively of described the 3rd rectification thyristor (VT3) and the 4th rectification thyristor (VT4), after described the 3rd rectification thyristor (VT3) and the complete conducting of the 4th rectification thyristor (VT4), described control device is controlled the described first main mos field effect transistor (VT1) and the work of the second main mos field effect transistor (VT2).
5, a kind of control device of soft starting circuit of circuit of power factor correction comprises: the soft starting 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 starting 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), send the drive signal of normally opened relay (K1), the 3rd rectification thyristor (VT3), the 4th rectification thyristor (VT4) and the 5th thyristor (VT5) in the soft starting circuit (301) of described three level Boost pfc circuits, control its operate as normal; The first main mos field effect transistor (VT1) in the soft starting 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) and the drive signal of the second main mos field effect transistor (VT2), make the soft starting circuit (301) of three level Boost pfc circuits possess civil power PFC or battery boost function, and having the output voltage stabilizing, power and current-limiting protection function 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 starting circuit (301) of three level Boost pfc circuits.
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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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| 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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| CN100338843C true CN100338843C (en) | 2007-09-19 |
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| CN102684469B (en) * | 2012-04-27 | 2015-11-25 | 华为技术有限公司 | Uninterrupted power supply, the method controlling uninterrupted power supply and control device |
| CN104578738A (en) * | 2014-12-29 | 2015-04-29 | 广东威创视讯科技股份有限公司 | Active limiting device and method for direct current overshoot |
| CN104578738B (en) * | 2014-12-29 | 2017-06-13 | 广东威创视讯科技股份有限公司 | A kind of DC current overshoots active restraints and method |
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| CN1428911A (en) | 2003-07-09 |
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