CN202353453U - Loss-free transducer soft-start device - Google Patents
Loss-free transducer soft-start device Download PDFInfo
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- CN202353453U CN202353453U CN 201120459927 CN201120459927U CN202353453U CN 202353453 U CN202353453 U CN 202353453U CN 201120459927 CN201120459927 CN 201120459927 CN 201120459927 U CN201120459927 U CN 201120459927U CN 202353453 U CN202353453 U CN 202353453U
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Abstract
The utility model relates to a loss-free transducer soft-start device, which is an electrifying buffer circuit, wherein the input end of the electrifying buffer circuit is connected with a transducer rectification circuit, and the output end of the electrifying buffer circuit is connected with a bus capacitor. The loss-free transducer soft-start device comprises a relay, an MOS (Metal Oxide Semiconductor) tube, a diode, an electric reactor and a control system, wherein the drain electrode of the MOS tube is connected with one end of the main contact of the relay; the source electrode 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 electrode of the MOS tube and one end of the electric reactor; the other end of the electric reactor is connected with the anode of the bus capacitor; the MOS tube, the relay and the bus capacitor are respectively connected with the control system; and the control system is also connected with a three-phase supply. According to the loss-free transducer soft-start device, damage on the rectification unit and an energy storage and filtering unit by high charging current during electrification can be effectively prevented so as to prevent the fault of the later-level circuit from enlarging.
Description
Technical field
The utility model relates to the frequency converter field, relates in particular to loss-free frequency converter soft starting device.
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.
The utility model content
There is the big technical problem of loss in order to solve existing soft start-up process; The purpose of the utility model 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.
The utility model adopts following technical scheme to realize above-mentioned 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.
Compared with prior art, the beneficial effect of the utility model 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, so the soft start-up process of the utility model 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 utility model 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 the utility model control system;
Fig. 4 is the method flow diagram that the utility model is realized soft start;
Fig. 5 is the drive waveforms figure of the frequency converter soft start of the utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but the execution mode of the utility model is not limited thereto.
Embodiment
As shown in Figure 2, the utility model frequency converter soft starting device, 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, the frequency converter soft-start method of the utility model 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 the soft start-up process of the utility model 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, so the soft start-up process of the utility model belongs to harmless start-up course.
The foregoing description is the utility model preferred implementation; But the execution mode of the utility model is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit and the principle of the utility model, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within the protection range of the utility model.
Claims (3)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120459927 CN202353453U (en) | 2011-11-18 | 2011-11-18 | Loss-free transducer soft-start device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120459927 CN202353453U (en) | 2011-11-18 | 2011-11-18 | Loss-free transducer soft-start device |
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| Publication Number | Publication Date |
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| CN202353453U true CN202353453U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201120459927 Expired - Fee Related CN202353453U (en) | 2011-11-18 | 2011-11-18 | Loss-free transducer soft-start device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412717A (en) * | 2011-11-18 | 2012-04-11 | 广州三晶电气有限公司 | Lossless soft start device and method for frequency converter |
| CN104539196A (en) * | 2014-12-10 | 2015-04-22 | 深圳市雷赛智能控制股份有限公司 | Driver soft start protecting device and protecting method thereof |
| CN104638898A (en) * | 2013-11-12 | 2015-05-20 | 沈阳新松机器人自动化股份有限公司 | Soft start control device system |
| CN105591365A (en) * | 2016-02-25 | 2016-05-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Frequency converter main circuit relay failure protection method |
| CN109286326A (en) * | 2018-10-18 | 2019-01-29 | 珠海格力电器股份有限公司 | High-power frequency conversion expanded circuit, control method, device and frequency conversion drive plate |
| 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 |
| CN112737417A (en) * | 2020-12-23 | 2021-04-30 | 扬州曙光光电自控有限责任公司 | Alternating current servo driver soft start circuit and working method thereof |
| CN114051689A (en) * | 2021-03-23 | 2022-02-15 | 华为数字能源技术有限公司 | Soft start circuit and converter |
-
2011
- 2011-11-18 CN CN 201120459927 patent/CN202353453U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412717A (en) * | 2011-11-18 | 2012-04-11 | 广州三晶电气有限公司 | Lossless soft start device and method for frequency converter |
| CN104638898A (en) * | 2013-11-12 | 2015-05-20 | 沈阳新松机器人自动化股份有限公司 | Soft start control device system |
| CN104539196A (en) * | 2014-12-10 | 2015-04-22 | 深圳市雷赛智能控制股份有限公司 | Driver soft start protecting device and protecting method thereof |
| CN105591365A (en) * | 2016-02-25 | 2016-05-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Frequency converter main circuit relay failure protection method |
| CN109286326A (en) * | 2018-10-18 | 2019-01-29 | 珠海格力电器股份有限公司 | High-power frequency conversion expanded circuit, control method, device and frequency conversion drive plate |
| 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 |
| CN112737417A (en) * | 2020-12-23 | 2021-04-30 | 扬州曙光光电自控有限责任公司 | Alternating current servo driver soft start circuit and working method thereof |
| CN112737417B (en) * | 2020-12-23 | 2022-05-20 | 扬州曙光光电自控有限责任公司 | Alternating current servo driver soft start circuit and working method thereof |
| CN114051689A (en) * | 2021-03-23 | 2022-02-15 | 华为数字能源技术有限公司 | Soft start circuit and converter |
| WO2022198456A1 (en) * | 2021-03-23 | 2022-09-29 | 华为数字能源技术有限公司 | Soft start circuit and converter |
| EP4318906A4 (en) * | 2021-03-23 | 2024-04-24 | Huawei Digital Power Technologies Co., Ltd. | Soft start circuit and converter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
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| CP01 | Change in the name or title of a patent holder |
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. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20171118 |
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| CF01 | Termination of patent right due to non-payment of annual fee |