CN105305802A - Rectifier soft start circuit and control method thereof - Google Patents
Rectifier soft start circuit and control method thereof Download PDFInfo
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- CN105305802A CN105305802A CN201510692221.4A CN201510692221A CN105305802A CN 105305802 A CN105305802 A CN 105305802A CN 201510692221 A CN201510692221 A CN 201510692221A CN 105305802 A CN105305802 A CN 105305802A
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Abstract
The invention provides a rectifier soft start circuit and a control method thereof. The circuit is arranged between the rectifier and a load, and comprises a first capacitor, a current-limiting unit, a relay and a DSP processor; one end of the current-limiting unit, one end of the relay, one end of the load and the positive DC bus of the rectifier are connected together; the other end of the load, the cathode of the first capacitor and the negative DC bus of the rectifier are connected together; the anode of the first capacitor, the other end of the current-limiting unit and the other end of the relay are connected together; and the DSP processor is used for controlling on and off of the relay. When the current-limiting unit is an IGBT transistor, the control method comprises steps: the DSP processor controls on and off of the IGBT transistor, charging and discharging of the first capacitor are thus controlled, the first capacitor is directly parallelly connected with the load, and thus start of the rectifier circuit is completed. By adopting the technical scheme of the invention, impact current in the case of start can be eliminated, and the start is quick.
Description
Technical field
The present invention relates to rectifier technology, particularly a kind of rectifier soft starting circuit and control method, belong to power electronics alternating-current technique field.
Background technology
Three-phase PWM Voltage Rectifier has the plurality of advantages such as unity power factor, current harmonics are low, energy in bidirectional flow, becomes one of hot subject of current power electronic applications research.The soft Starting Technology of Three-phase PWM Voltage Rectifier is one of key technology of Three-phase PWM Voltage Rectifier useization.Due to the bulky capacitor of DC side, make circuit start can produce larger impulse current instantaneously, not only affect the life-span of components and parts in circuit, great impact can be caused on electrical network simultaneously.The main purpose of soft Starting Technology is exactly reduce impulse current when starting, current soft starting circuit is commonly used current-limiting resistance and is followed relay in parallel with paralleled power switches or current-limiting resistance, this technical disadvantages is that start-up time is longer, especially for reaching more than 10s start-up time high power three-phase voltage type PWM rectifier, soft start still there will be larger impulse current after terminating simultaneously, and this soft starting circuit can only start under no-load condition, have during load and cannot realize soft start.
Summary of the invention
Of a specified duration for start-up time for current soft starting circuit, the defect that only could start under no-load condition, the present invention discloses a kind of rectifier soft starting circuit, and discloses its control method, can eliminate impulse current during startup, and starts fast.Concrete scheme is as follows:
A kind of rectifier soft starting circuit, is arranged between rectifier and load, it is characterized in that: comprise the first electric capacity, flow-restriction, relay, dsp processor; One end and the rectifier positive direct-current bus of one end of described flow-restriction, one end of relay, load link together; The other end of described load, the first capacitance cathode and rectifier are born DC bus and are linked together; Described first capacitor anode and the other end of flow-restriction, the other end of relay link together; Described dsp processor is for controlling the break-make of described relay.
In an embodiment of the present invention, described rectifier is three phase full bridge topology rectifier.
In an embodiment of the present invention, described relay is normally opened relay.
In an embodiment of the present invention, described flow-restriction is IGBT pipe, and described IGBT pipe collector is connected with described rectifier positive direct-current bus, and described IGBT pipe emitter is connected with described first capacitor anode.
Further, described dsp processor is for controlling the break-make of described IGBT pipe.
In an embodiment of the present invention, described flow-restriction is current-limiting resistance.
Further, also comprise the second electric capacity, described second electric capacity is in parallel with the positive and negative DC bus of rectifier.
The capacitance of described second electric capacity is less than the capacitance of the first electric capacity.
The present invention also discloses a kind of control method based on described rectifier soft starting circuit, it is characterized in that: during rectifier soft start, dsp processor control IGBT pipe break-make, for making the first electric capacity discontinuity charging, until the first electric capacity completes charging; After the first electric capacity completes charging, dsp processor control IGBT pipe turns off, and control relay closes simultaneously, and now the first electric capacity is in parallel with the positive and negative DC bus of rectifier, completes rectifier and starts.
The present invention also discloses a kind of control method based on described rectifier soft starting circuit, it is characterized in that: during rectifier soft start, and described second electric capacity is in charged state, starts rectifier circuit after completing charging fast; While second capacitor charging, dsp processor control relay disconnects, make the first electric capacity and current-limiting resistance series connection, first electric capacity is in charged state, after first electric capacity completes charging, dsp processor control relay closes, and current-limiting resistance is shorted, all positive and negative with the rectifier DC bus of first electric capacity, the second electric capacity is in parallel, completes rectifier and starts.
At present conventional soft starting circuit, on the main line of load and bulky capacitor, namely add current-limiting resistance with paralleled power switches structure or current-limiting resistance with relay parallel-connection structure, the present invention is different from this.In the present invention, soft start circuit structure is shifted out main line, overcome and originally cannot with carrying the defect started, and control simple, starting current be little.When flow-restriction is IGBT pipe, give the first capacitor charging by discontinuity, charging rate is fast, and charging current is little, reaches Quick soft-start; On the other hand, there is no current-limiting resistance during startup so to start loss little, and start terminate after by relay IGBT tube short circuit, non-insertion switch pipe loss during rectifier work, efficiency is high.And flow-restriction is when being current-limiting resistance, first complete charging by the second electric capacity that capacitance is very little, make rectifier can rapid operation under lower state, toggle speed is fast, give the first capacitor charging by current-limiting resistance again, complete whole charging process, system works conversion is milder.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit diagram of the embodiment of the present invention one.
Accompanying drawing 2 is the circuit diagram of the embodiment of the present invention two.
Embodiment
For make object of the present invention, technical scheme clearly, understand, further illustrate design of the present invention below in conjunction with drawings and Examples.
The invention provides a kind of rectifier soft starting circuit, be arranged between rectifier and load, it is characterized in that: comprise the first electric capacity, flow-restriction, relay, dsp processor; One end and the rectifier positive direct-current bus of one end of described flow-restriction, one end of relay, load link together; The other end of described load, the first capacitance cathode and rectifier are born DC bus and are linked together; Described first capacitor anode and the other end of flow-restriction, the other end of relay link together; Described dsp processor is for controlling the break-make of described relay.
Preferably, described rectifier is three phase full bridge topology rectifier.
Preferably, described relay is normally opened relay.
Embodiment one:
A kind of rectifier soft starting circuit and control method thereof described in the present invention is further illustrated for Three-phase PWM Voltage Rectifier in the present embodiment.As shown in Figure 1, described rectifier soft starting circuit is arranged between rectifier and load, comprising: the first electric capacity C
1, flow-restriction, relay K, dsp processor (not shown in FIG.), in the present embodiment, flow-restriction is the IGBT pipe S containing anti-paralleled diode; The wherein collector electrode of three-phase commutation bridge positive direct-current bus P+, IGBT pipe S, one end of relay K, load R
lone end link together, three-phase commutation bridge bears DC bus P-, the first electric capacity C
1negative electrode, load R
lthe other end link together; The emitter of described IGBT pipe S and the first electric capacity C
1anode, relay K the other end link together; The on off operating mode of described dsp processor control IGBT pipe S and relay K.
Described relay K is normally opened relay.
As preferably, described dsp processor selects the dsp processor of Texas Instruments 2000 series.
Described electric capacity C
1for large electrochemical capacitor, the such as electrochemical capacitor of optional 4700uF, realizes stable DC and surveys voltage and suppress DC side harmonics voltage.
Control method for above-mentioned a kind of rectifier soft starting circuit is: when described rectifier circuit starts, the break-make of dsp processor control IGBT pipe S, and then controls the first electric capacity C
1discontinuity is charged, until the first electric capacity C
1charging complete; When the state of the square wave that dsp processor exports is high level, IGBT pipe S conducting, the voltage that rectifier bridge exports gives the first electric capacity C
1charging; When the state of the square wave that dsp processor exports is low level, IGBT pipe S turns off, now the first electric capacity C
1do not charge; As the first electric capacity C
1during charging complete, dsp processor is control relay K conducting again, makes the first electric capacity C
1directly and load R
lparallel connection, completes rectifier circuit and starts.Due to the first electric capacity C
1be to fill time electricity at set intervals, according to actual conditions, each charging interval is chosen as 5us, so charging current is very little, by the first electric capacity C
1be interrupted charging, the soft start of completing circuit, effectively can suppress impulse current when starting.
A kind of rectifier soft starting circuit described in the present embodiment overcomes existing soft starting circuit and cannot with carrying the defect started, and control simple, and starting current is little.This programme by be interrupted give the first electric capacity C
1charging, charging rate is fast, and charging current is little, reaches Quick soft-start; On the other hand, there is no current-limiting resistance during startup so to start loss little, and start terminate after by relay K IGBT tube short circuit, non-insertion switch pipe loss during rectifier work, efficiency is high.
Embodiment two:
A kind of rectifier soft starting circuit described in the present invention and control method thereof is further illustrated for Three-phase PWM Voltage Rectifier equally in the present embodiment.Fig. 2 is the circuit diagram of the present embodiment, comprising: the first electric capacity C
1, current-limiting resistance R
0(being the flow-restriction described in the present invention), relay K, dsp processor (not shown in FIG.), as shown in Figure 2, also comprise the second electric capacity C in the present embodiment
0.Physical circuit connects as follows: described second electric capacity C
0anode and three-phase commutation bridge positive direct-current bus P+, one end of relay K, current-limiting resistance R
0one end, load R
lone end link together, described second electric capacity C
0negative electrode and three-phase commutation bridge bear DC bus P-, the first electric capacity C
1negative electrode, load R
lthe other end link together; The other end of described relay K and current-limiting resistance R
0the other end, the first electric capacity C
1anode link together; The on off operating mode of described dsp processor control relay K.
As preferably, described relay K, dsp processor and the first electric capacity C
1described in embodiment one.
And the second described electric capacity C
0capacitance much smaller than the first electric capacity C
1, the such as electrochemical capacitor of optional 100uF.
The control method of a kind of rectifier soft starting circuit described in the present embodiment is: when rectifier circuit starts, described second electric capacity C
0be in charged state, and the second electric capacity C
0capacity very little, can complete fast and charge and start rectifier.Second electric capacity C
0electric current during charging is very little, so total current when starting is less.Second electric capacity C
0while charging, dsp processor control relay is in off state, now the first electric capacity C
1with current-limiting resistance R
0series connection, due to current-limiting resistance R
0effect, rectifier export direct voltage give the first electric capacity C
1charging current is very little, as the first electric capacity C
1during charging complete, dsp processor controls to make relay conducting, now current-limiting resistance R
0be shorted, the first electric capacity C
1, the second electric capacity C
0with load R
ldirect parallel connection, finally completes rectifier circuit and starts.
The band that the present embodiment achieves circuit equally carries startup, differently from embodiment one is, in the present embodiment, described flow-restriction is a current-limiting resistance R
0, instead of the IGBT pipe S in embodiment one, introduce the second electric capacity C simultaneously
0, the second electric capacity C
0capacitance much smaller than the first electric capacity C
1, by the second electric capacity C
0preferentially complete charging fast, make rectifier can rapid operation under lower state, toggle speed is fast, then by current-limiting resistance R
0to the first electric capacity C
1charging, completes whole charging process, and system works conversion is milder.
Those skilled in the art can make various amendment to this specific embodiment or supplement or adopt similar mode to substitute under the prerequisite without prejudice to principle of the present invention and essence, but these changes all should fall into protection scope of the present invention.Therefore the technology of the present invention scope is not limited to above-described embodiment.
Claims (10)
1. a rectifier soft starting circuit, is arranged between rectifier and load, it is characterized in that: comprise the first electric capacity, flow-restriction, relay, dsp processor; One end and the rectifier positive direct-current bus of one end of described flow-restriction, one end of relay, load link together; The other end of described load, the first capacitance cathode and rectifier are born DC bus and are linked together; Described first capacitor anode and the other end of flow-restriction, the other end of relay link together; Described dsp processor is for controlling the break-make of described relay.
2. rectifier soft starting circuit according to claim 1, is characterized in that: described rectifier is three phase full bridge topology rectification circuit.
3. rectifier soft starting circuit according to claim 1, is characterized in that: described relay is normally opened relay.
4. rectifier soft starting circuit according to claim 1, is characterized in that: described flow-restriction is IGBT pipe, and described IGBT pipe collector is connected with described rectifier positive direct-current bus, and described IGBT pipe emitter is connected with described first capacitor anode.
5. rectifier soft starting circuit according to claim 4, is characterized in that: described dsp processor is for controlling the break-make of described IGBT pipe.
6. rectifier soft starting circuit according to claim 1, is characterized in that: described flow-restriction is current-limiting resistance.
7. rectifier soft starting circuit according to claim 6, is characterized in that: also comprise the second electric capacity, described second electric capacity is in parallel with the positive and negative DC bus of rectifier.
8. rectifier soft starting circuit according to claim 7, is characterized in that: the capacitance of described second electric capacity is less than the capacitance of the first electric capacity.
9. based on a control method for rectifier soft starting circuit according to claim 5, it is characterized in that: during rectifier soft start, dsp processor control IGBT pipe break-make, for making the first electric capacity discontinuity charging, until the first electric capacity completes charging; After the first electric capacity completes charging, dsp processor control IGBT pipe turns off, and control relay closes simultaneously, and now the first electric capacity is in parallel with the positive and negative DC bus of rectifier, completes rectifier and starts.
10. based on a control method for the rectifier soft starting circuit described in claim 7 or 8, it is characterized in that: during rectifier soft start, described second electric capacity is in charged state, starts rectifier circuit after completing charging fast; While second capacitor charging, dsp processor control relay disconnects, make the first electric capacity and current-limiting resistance series connection, first electric capacity is in charged state, after first electric capacity completes charging, dsp processor control relay closes, and current-limiting resistance is shorted, all positive and negative with the rectifier DC bus of first electric capacity, the second electric capacity is in parallel, completes rectifier and starts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510692221.4A CN105305802A (en) | 2015-10-23 | 2015-10-23 | Rectifier soft start circuit and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510692221.4A CN105305802A (en) | 2015-10-23 | 2015-10-23 | Rectifier soft start circuit and control method thereof |
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| CN105305802A true CN105305802A (en) | 2016-02-03 |
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| CN201510692221.4A Pending CN105305802A (en) | 2015-10-23 | 2015-10-23 | Rectifier soft start circuit and control method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602860A (en) * | 2017-02-23 | 2017-04-26 | 国网江西省电力公司赣东北供电分公司 | Small-impact-current low-voltage current converter soft-starting control method |
| 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 |
| CN109842326A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN110065392A (en) * | 2019-03-26 | 2019-07-30 | 天津三电汽车空调有限公司 | A kind of high pressure preliminary filling module with contactor for preventing adhesion function |
| CN110405250A (en) * | 2018-04-28 | 2019-11-05 | 南京德朔实业有限公司 | circular saw |
| CN111313766A (en) * | 2018-12-12 | 2020-06-19 | 上海安浦鸣志自动化设备有限公司 | Driver current-limiting starting circuit and method for direct-current power supply system |
| CN111786355A (en) * | 2020-06-23 | 2020-10-16 | 上海电器科学研究所（集团）有限公司 | Protection device and protection method for restraining short circuit of direct current bus support capacitor |
| 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 |
| CN114167934A (en) * | 2021-12-08 | 2022-03-11 | 北京北航天宇长鹰无人机科技有限公司 | Filtering and voltage-stabilizing control circuit and system |
| EP4383495A1 (en) * | 2022-12-08 | 2024-06-12 | Vertiv Corporation | Soft start circuit of ups relay |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602860A (en) * | 2017-02-23 | 2017-04-26 | 国网江西省电力公司赣东北供电分公司 | Small-impact-current low-voltage current converter soft-starting control method |
| CN106602860B (en) * | 2017-02-23 | 2019-01-11 | 国网江西省电力公司赣东北供电分公司 | A kind of low pressure inverter soft start control method of small dash current |
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| CN109842325B (en) * | 2017-11-24 | 2021-05-07 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN109842281B (en) * | 2017-11-24 | 2020-12-01 | 南京德朔实业有限公司 | Electric tool |
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| CN109842325A (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 |
| CN110405250A (en) * | 2018-04-28 | 2019-11-05 | 南京德朔实业有限公司 | circular saw |
| CN111313766A (en) * | 2018-12-12 | 2020-06-19 | 上海安浦鸣志自动化设备有限公司 | Driver current-limiting starting circuit and method for direct-current power supply system |
| CN110065392A (en) * | 2019-03-26 | 2019-07-30 | 天津三电汽车空调有限公司 | A kind of high pressure preliminary filling module with contactor for preventing adhesion function |
| CN111786355A (en) * | 2020-06-23 | 2020-10-16 | 上海电器科学研究所（集团）有限公司 | Protection device and protection method for restraining short circuit of direct current bus support capacitor |
| 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 Tech Co Ltd | Soft start circuit and converter |
| CN114167934A (en) * | 2021-12-08 | 2022-03-11 | 北京北航天宇长鹰无人机科技有限公司 | Filtering and voltage-stabilizing control circuit and system |
| EP4383495A1 (en) * | 2022-12-08 | 2024-06-12 | Vertiv Corporation | Soft start circuit of ups relay |
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