CN102412717A - Lossless soft start device and method for frequency converter - Google Patents
Lossless soft start device and method for frequency converter Download PDFInfo
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- CN102412717A CN102412717A CN2011103675541A CN201110367554A CN102412717A CN 102412717 A CN102412717 A CN 102412717A CN 2011103675541 A CN2011103675541 A CN 2011103675541A CN 201110367554 A CN201110367554 A CN 201110367554A CN 102412717 A CN102412717 A CN 102412717A
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Abstract
The invention relates to a lossless soft start device and method for a frequency converter. The soft start device is a power-on buffering circuit of which the input end is connected with a frequency converter rectification circuit while the output end is connected with a bus capacitor, and comprises a relay, an MOS (Metal-Oxide Semiconductor) tube, a diode, a reactor and a control system, wherein the drain of the MOS tube is connected with one end of a main contact of the relay; the source of the MOS tube is connected with the other end of the main contact of the relay; the anode of the diode is connected with the cathode of the bus capacitor; the cathode of the diode is connected with the source of the MOS tube and one end of the reactor; the other end of the reactor is connected with the anode of the bus capacitor; the MOS tube, the relay and the bus capacitor are connected with the control system respectively; and the control system is further connected with a three-phase power supply. Due to the adoption of the device and the method, high charging current generated during electrifying is effectively prevented from damaging a rectification unit and an energy-storing filtering unit, and a fault of a next stage circuit is further prevented from being amplified.
Description
Technical field
The present invention relates to the frequency converter field, relate in particular to the method for loss-free frequency converter soft starting device and realization soft start.
Background technology
Frequency converter is the on-off action that utilizes power semiconductor device, regulates mains frequency to regulate a kind of control device of motor speed.Frequency control has speed-regulating range width, and adjusting speed accuracy is high, and dynamic response is fast, and low speed torque is good, saves energy, high efficiency, advantage such as easy to use.Use frequency control, motor is moved under energy-conservation rotating speed, but also can improve the control precision of motor speed greatly, promote processing quality and production efficiency.
For voltage-type ac-dc-ac frequency converter topology commonly used at present, prime is the uncontrollable rectification unit of input, and intergrade is a high power DC energy storage filter unit, and the back level is the inversion output unit.The dc energy storage filter unit mainly is made up of big capacity electrochemical capacitor; Because the electric capacity initial condition is equivalent to short circuit, the frequency converter input side closes a floodgate when powering on, if just the voltage after the rectification is added on the electrochemical capacitor without any processing; Can cause the charging current that moment is bigger; Thereby impact for the frequency converter commutating circuit, and cause the electrochemical capacitor life-span to descend, even have the danger of blast.Therefore, we must design a kind of apparatus and method, make power on moment the electrochemical capacitor two ends voltage slowly rise, Here it is our said soft starting device and soft-start method appears to avoid above-mentioned fault.
The scheme of the frequency converter soft start that uses in the frequency converter industry at present has following several kinds usually:
1, current-limiting resistance adds relay (or controllable silicon) combination
As shown in Figure 1, series limiting resistor in the charge circuit of bus capacitor, and have switching device (for example relay or controllable silicon) parallelly connected with current-limiting resistance.Power up after-current and flow through from charging resistor earlier, bus capacitor is charged by the current-limiting resistance current limliting; When the DC voltage rising of bus capacitor during to set point, use switching device with the current-limiting resistance bypass, get into normal operating conditions.Traditional frequency converter generally adopts this kind scheme.The shortcoming of this scheme is: the loss of soft start-up process current-limiting resistance is big, and heating is serious, and reliability is low, in case current-limiting resistance burns out, frequency converter just can not be restarted, thereby frequency converter can not be worked.When frequency converter frequently powered on, frequency converter was operated in the soft start state with continuous several times, and current-limiting resistance will generate heat serious more and burn out, and make frequency converter produce fault, greatly reduce the reliability of system.
2, thyristor half control rectification
This scheme is to utilize the half control characteristic of thyristor, during electrifying startup, through the angle of flow of control thyristor, makes that the voltage on the filter capacitor slowly rises by the rule of setting, and realizes soft start.The shortcoming of this scheme is, needs to detect input voltage the angle of flow is controlled the circuits for triggering complex design.
3, utilize Switching Power Supply precharge
This scheme is to connect the auxiliary switching power supply that output is connected to bus capacitor before the frequency converter electrifying startup earlier; Utilize the soft-start feature of Switching Power Supply that bus capacitor is carried out precharge; The to be charged completion being connected of back disconnection and bus capacitor connected frequency converter primary input switch again.The shortcoming of this scheme is, needs to increase auxiliary switching power supply, and circuit structure is complicated, volume is big, cost is high.
Summary of the invention
There is the big technical problem of loss in order to solve existing soft start-up process; Primary and foremost purpose of the present invention provides loss-free frequency converter soft starting device; Reduce the power consumption of soft start; Big charging current when effectively having prevented to power on is to the damage of rectification unit and energy storage filter unit, and and then prevents that the fault of back one-level circuit from enlarging, and improves system reliability.
In order to solve the problems of the technologies described above; Another object of the present invention provides loss-free frequency converter soft-start method; Reduce the power consumption of soft start; Big charging current when effectively having prevented to power on is to the damage of rectification unit and energy storage filter unit, and and then prevents that the fault of back one-level circuit from enlarging, and improves system reliability.
The present invention adopts following technical scheme to realize above-mentioned primary and foremost purpose:
Loss-free frequency converter soft starting device, input links to each other with the frequency converter rectification circuit, and output links to each other with bus capacitor, and said soft starting device is the buffer circuit that powers on, and comprises relay, metal-oxide-semiconductor, diode, reactor and control system; Said metal-oxide-semiconductor drain electrode links to each other with relay main contacts one end, and source electrode links to each other with the relay main contacts other end; Said diode anode links to each other with the bus capacitor negative pole, and negative electrode links to each other with metal-oxide-semiconductor source electrode and reactor one end; The said reactor other end links to each other with bus capacitor is anodal; Said metal-oxide-semiconductor, relay, bus capacitor are connected with control system respectively, and said control system also is connected with three phase mains.
Preferably, said control system comprises: first comparison module is used to judge whether the frequency converter input city signal of telecommunication is normal; Second comparison module is used to judge the completion of whether charging of frequency converter bus capacitor; Control module is used for to metal-oxide-semiconductor and relay output drive signal; Said first comparison module is connected with control module respectively with second comparison module.
The chip model of said control system is TMS320LF2406A.
The present invention adopts following technical scheme to realize above-mentioned another purpose:
Soft-start method based on above-mentioned frequency converter soft starting device comprises following steps:
S1, first comparison module judge whether detected frequency converter input power supply signal is normal, like undesired entering step S2, as normally then getting into step S3;
The drive signal that metal-oxide-semiconductor and relay conducting are forbidden in S2, control module output is forbidden the bus capacitor charging, finishes soft start;
The drive signal that S3, control module output duty cycle diminish is gradually opened metal-oxide-semiconductor, makes metal-oxide-semiconductor, diode and reactor constitute the constant current charge circuit bus capacitor is charged;
S4, second comparison module detect and judge bus capacitor completions of whether charging, and like charging completion entering step S5, otherwise return step S3;
The drive signal of metal-oxide-semiconductor output is blocked in S5, control module output, and exports the drive signal that makes relay J K1 closed, accomplishes soft start-up process.
Preferably, charging is specially said step S3 to bus capacitor:
When metal-oxide-semiconductor was opened, reactor current is linear to rise, and the bus capacitor charging current is linear to rise; When metal-oxide-semiconductor turn-offed, reactor released energy, and reactor current is through diode continuousing flow and the linear decline of reactor current, and the bus capacitor charging current descends.
Compared with prior art, beneficial effect of the present invention is,
1, used control system is the elementary cell of frequency converter; Used reactor also is that frequency converter is originally as improving the added necessary element of input characteristics; Not extra increase in order to realize soft start function; Circuit only needs a small-power metal-oxide-semiconductor of extra increase element, has reduced hardware cost, has improved system reliability; And realize numerically controlled soft start-up process flexible design soft start curve as required with control system, and reach satisfied soft-start feature, reduce impact to bus capacitor, improved system reliability.
2, soft start-up process is to utilize the switching characteristic of metal-oxide-semiconductor, makes direct current reactor be operated in constant current state and accomplishes, and the metal-oxide-semiconductor switching loss is very little, and therefore soft start-up process of the present invention belongs to lossless start-up course.
3, the input state according to frequency converter determines whether the bus capacitor charging, thus protection bus capacitor and late-class circuit.
Description of drawings
Fig. 1 is that at present general utilize charging resistor and relay realized the circuit diagram of frequency converter soft start;
Fig. 2 is that the present invention utilizes small power switch pipe and relay to realize the circuit diagram of frequency converter soft start;
Fig. 3 is the module frame chart of control system of the present invention;
Fig. 4 is the method flow diagram that the present invention realizes soft start;
Fig. 5 is the drive waveforms figure of frequency converter soft start of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but execution mode of the present invention is not limited thereto.
Embodiment
As shown in Figure 2, frequency converter soft starting device of the present invention, input links to each other with frequency converter rectification circuit B1, and output links to each other with bus capacitor C1; Wherein, said soft starting device is the buffer circuit that powers on, and comprises relay J K1, metal-oxide-semiconductor Q1, diode D1, reactor L1 and control system; Said metal-oxide-semiconductor Q1 drain electrode links to each other with relay J K1 main contacts one end, and source electrode links to each other with the relay J K1 main contacts other end; Said diode D1 anode links to each other with bus capacitor C1 negative pole, and negative electrode links to each other with metal-oxide-semiconductor Q1 source electrode and reactor L1 one end; The said reactor L1 other end links to each other with bus capacitor C1 is anodal; Said metal-oxide-semiconductor Q1, relay J K1, bus capacitor C1 are connected with control system respectively, and said control system also is connected with three phase mains.
Referring to Fig. 3; Said control system comprises the control module that is used for to metal-oxide-semiconductor and relay output drive signal, and being used to of being connected with control module respectively judged the frequency converter input city signal of telecommunication whether normal first comparison module and second comparison module that is used to judge whether the frequency converter bus capacitor charges and accomplish; First comparison module receives three phase mains signal (being city's signal of telecommunication), and second comparison module receives the bus capacitor signal; Control module is according to the comparative result of first comparison module and second comparison module, to metal-oxide-semiconductor Q1 and relay J K1 difference output drive signal.
As shown in Figure 4, frequency converter soft-start method of the present invention may further comprise the steps:
The first step, before the frequency converter soft start (0-T0 period); Metal-oxide-semiconductor Q1 and relay J K1 are cut-off state, and first comparison module of Frequency Converter Control system is judged (main voltage and the frequency of judging the input civil power) to the input power supply (being city's signal of telecommunication) of detected frequency converter; When judging that the input power supply is undesired, high excessively like input voltage, changed for second step over to; When judging input power supply just often (T0-T1 period), changed for the 3rd step over to.
Metal-oxide-semiconductor and relay action signal are forbidden in the control module output of second step, control system, forbid the bus capacitor charging, thereby have protected the frequency converter main system.
The control module output duty cycle D of the 3rd step, control system diminish gradually (as T0-T1 among Fig. 5 constantly shown in) drive signal open metal-oxide-semiconductor Q1, the constant current charge circuit that makes metal-oxide-semiconductor Q1, diode D1 and reactor L1 constitute certain current ripples charges to bus capacitor.When metal-oxide-semiconductor Q1 opened, reactor current is linear to rise, the while storage power, and the bus capacitor charging current is linear to rise, and busbar voltage slowly raises; When metal-oxide-semiconductor Q1 turn-offed, reactor released energy, and its electric current is through diode D1 afterflow, and electric current is linear to descend, and the bus capacitor charging current descends, and busbar voltage slowly raises.Through regulating the Changing Pattern of duty ratio, bus capacitor can charge according to needed current curve.
Second comparison module of the 4th step, control system detects bus capacitor completions of whether charging, and does not then return for the 3rd step if charging is accomplished, if the charging completion then changing for the 5th step over to.
The 5th step, judge busbar voltage C1 when second comparison module of control system and reach rated value (T1 constantly); When promptly charging is accomplished; The drive signal that metal-oxide-semiconductor Q1 is blocked in the control module output of control system, and export the drive signal that makes relay J K1 closed, thus accomplish soft start-up process.
In the present embodiment, used control system is the elementary cell of numerically controlled frequency converter, and its control chip model is TMS320LF2406A; Used reactor also is that frequency converter is originally as improving the added essential element of input characteristics; Not extra increase in order to realize soft start function; Circuit only needs small-power metal-oxide-semiconductor of extra increase and a low-power diode, has reduced cost, has improved reliability; And realize that with control system numerically controlled soft start-up process can be as required come flexible design soft start curve through the change in duty cycle rule of design control module institute output drive signal; Reach satisfied soft-start feature; When guaranteeing quick charge; Reduce impact, improved reliability bus capacitor.Because soft start-up process of the present invention is to utilize the switching characteristic of metal-oxide-semiconductor, makes direct current reactor be operated in constant current state and accomplishes, the metal-oxide-semiconductor switching loss is very little, and therefore soft start-up process of the present invention belongs to harmless start-up course.
The foregoing description is a preferred implementation of the present invention; But execution mode of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. loss-free frequency converter soft starting device, input links to each other with the frequency converter rectification circuit, and output links to each other with bus capacitor, it is characterized in that:
Said soft starting device is the buffer circuit that powers on, and comprises relay, metal-oxide-semiconductor, diode, reactor and control system; Said metal-oxide-semiconductor drain electrode links to each other with relay main contacts one end, and source electrode links to each other with the relay main contacts other end; Said diode anode links to each other with the bus capacitor negative pole, and negative electrode links to each other with metal-oxide-semiconductor source electrode and reactor one end; The said reactor other end links to each other with bus capacitor is anodal; Said metal-oxide-semiconductor, relay, bus capacitor are connected with control system respectively, and said control system also is connected with three phase mains.
2. according to the described frequency converter soft starting device of claim 1, it is characterized in that said control system comprises:
First comparison module is used to judge whether the frequency converter input city signal of telecommunication is normal;
Second comparison module is used to judge the completion of whether charging of frequency converter bus capacitor;
Control module is used for to metal-oxide-semiconductor and relay output drive signal;
Said first comparison module is connected with control module respectively with second comparison module.
3. according to the described frequency converter soft starting device of claim 2, it is characterized in that the chip model of said control system is TMS320LF2406A.
4. based on the soft-start method of the said frequency converter soft starting device of claim 2, it is characterized in that, comprise following steps:
S1, first comparison module judge whether detected frequency converter input power supply signal is normal, like undesired entering step S2, as normally then getting into step S3;
The drive signal that metal-oxide-semiconductor and relay conducting are forbidden in S2, control module output is forbidden the bus capacitor charging, finishes soft start;
The drive signal that S3, control module output duty cycle diminish is gradually opened metal-oxide-semiconductor, makes metal-oxide-semiconductor, diode and reactor constitute the constant current charge circuit bus capacitor is charged;
S4, second comparison module detect and judge bus capacitor completions of whether charging, and like charging completion entering step S5, otherwise return step S3;
The drive signal of metal-oxide-semiconductor output is blocked in S5, control module output, and exports the drive signal that makes relay J K1 closed, accomplishes soft start-up process.
5. according to the described soft-start method of claim 4, it is characterized in that charging is specially said step S3 to bus capacitor:
When metal-oxide-semiconductor was opened, reactor current is linear to rise, and the bus capacitor charging current is linear to rise; When metal-oxide-semiconductor turn-offed, reactor released energy, and reactor current is through diode continuousing flow and the linear decline of reactor current, and the bus capacitor charging current descends.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832798A (en) * | 2012-08-29 | 2012-12-19 | 深圳市英威腾电气股份有限公司 | Powering buffering control circuit and control method thereof |
| 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 |
| CN103532146A (en) * | 2013-10-24 | 2014-01-22 | 北京华东电气股份有限公司 | Electronic APF/SVG soft start device |
| CN105305802A (en) * | 2015-10-23 | 2016-02-03 | 漳州科华技术有限责任公司 | Rectifier soft start circuit and control method thereof |
| WO2018227422A1 (en) * | 2017-06-14 | 2018-12-20 | 上海明石光电科技有限公司 | Switch-mode power supply and soft-start circuit thereof |
| CN109075705A (en) * | 2016-04-15 | 2018-12-21 | 三菱电机株式会社 | Vehicle-mounted charger |
| CN109842326A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN109861518A (en) * | 2019-03-27 | 2019-06-07 | 深圳市航嘉驰源电气股份有限公司 | A kind of current-limited startup circuit and power-switching circuit |
| CN111200355A (en) * | 2018-11-19 | 2020-05-26 | 上海微电子装备（集团）股份有限公司 | Power-on buffer circuit |
| CN111817587A (en) * | 2020-07-27 | 2020-10-23 | 深圳市汇川技术股份有限公司 | Thyristor rectification soft start control method and device and storage medium |
| CN112467969A (en) * | 2020-11-05 | 2021-03-09 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
| CN112564078A (en) * | 2020-11-18 | 2021-03-26 | 华为技术有限公司 | Power supply system, slow starting circuit and control method |
| CN112952944A (en) * | 2021-02-26 | 2021-06-11 | 广州智光储能科技有限公司 | Energy storage system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6760235B2 (en) * | 2001-09-13 | 2004-07-06 | Netpower Technologies, Inc. | Soft start for a synchronous rectifier in a power converter |
| CN101420137A (en) * | 2007-10-26 | 2009-04-29 | 现代自动车株式会社 | Startup sequence control method of fuel cell-super capacitor hybrid electric vehicle |
| CN201994841U (en) * | 2011-03-21 | 2011-09-28 | 深圳市禾望电气有限公司 | Frequency converter |
| CN202353453U (en) * | 2011-11-18 | 2012-07-25 | 广州三晶电气有限公司 | Loss-free transducer soft-start device |
-
2011
- 2011-11-18 CN CN201110367554.1A patent/CN102412717B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6760235B2 (en) * | 2001-09-13 | 2004-07-06 | Netpower Technologies, Inc. | Soft start for a synchronous rectifier in a power converter |
| CN101420137A (en) * | 2007-10-26 | 2009-04-29 | 现代自动车株式会社 | Startup sequence control method of fuel cell-super capacitor hybrid electric vehicle |
| CN201994841U (en) * | 2011-03-21 | 2011-09-28 | 深圳市禾望电气有限公司 | Frequency converter |
| CN202353453U (en) * | 2011-11-18 | 2012-07-25 | 广州三晶电气有限公司 | Loss-free transducer soft-start device |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102832798A (en) * | 2012-08-29 | 2012-12-19 | 深圳市英威腾电气股份有限公司 | Powering buffering control circuit and control method thereof |
| CN102832798B (en) * | 2012-08-29 | 2015-09-16 | 深圳市英威腾电气股份有限公司 | One powers on buffer control circuit and control method thereof |
| 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 |
| CN103532146A (en) * | 2013-10-24 | 2014-01-22 | 北京华东电气股份有限公司 | Electronic APF/SVG soft start device |
| CN103532146B (en) * | 2013-10-24 | 2015-06-17 | 北京华东电气股份有限公司 | Electronic APF/SVG soft start device |
| CN105305802A (en) * | 2015-10-23 | 2016-02-03 | 漳州科华技术有限责任公司 | Rectifier soft start circuit and control method thereof |
| CN109075705A (en) * | 2016-04-15 | 2018-12-21 | 三菱电机株式会社 | Vehicle-mounted charger |
| CN109075705B (en) * | 2016-04-15 | 2020-09-01 | 三菱电机株式会社 | Charger for vehicle |
| WO2018227422A1 (en) * | 2017-06-14 | 2018-12-20 | 上海明石光电科技有限公司 | Switch-mode power supply and soft-start circuit thereof |
| CN109842281A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Electric tool |
| CN109842281B (en) * | 2017-11-24 | 2020-12-01 | 南京德朔实业有限公司 | Electric tool |
| CN109842325B (en) * | 2017-11-24 | 2021-05-07 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN109842325A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN109842326A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN109842326B (en) * | 2017-11-24 | 2020-12-01 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN111200355A (en) * | 2018-11-19 | 2020-05-26 | 上海微电子装备（集团）股份有限公司 | Power-on buffer circuit |
| CN111200355B (en) * | 2018-11-19 | 2021-04-09 | 上海微电子装备（集团）股份有限公司 | Power-on buffer circuit |
| CN109861518A (en) * | 2019-03-27 | 2019-06-07 | 深圳市航嘉驰源电气股份有限公司 | A kind of current-limited startup circuit and power-switching circuit |
| CN111817587A (en) * | 2020-07-27 | 2020-10-23 | 深圳市汇川技术股份有限公司 | Thyristor rectification soft start control method and device and storage medium |
| CN112467969A (en) * | 2020-11-05 | 2021-03-09 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
| CN112467969B (en) * | 2020-11-05 | 2021-12-03 | 珠海格力电器股份有限公司 | Starting control device and method of frequency converter and magnetic suspension system |
| CN112564078A (en) * | 2020-11-18 | 2021-03-26 | 华为技术有限公司 | Power supply system, slow starting circuit and control method |
| CN112952944A (en) * | 2021-02-26 | 2021-06-11 | 广州智光储能科技有限公司 | Energy storage system |
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Address after: 510663 No. 17 incense Hill Road, science and Technology Town, Guangzhou hi tech Development Zone, Guangdong, China Patentee after: GUANGZHOU SANJING ELECTRIC CO., LTD. Address before: 510663 No. 17 incense Hill Road, science and Technology Town, Guangzhou hi tech Development Zone, Guangdong, China Patentee before: Guangzhou Sanjing Electric Co., Ltd. |