CN106300271B - The detection method and converter plant of soft start failure - Google Patents
The detection method and converter plant of soft start failure Download PDFInfo
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- CN106300271B CN106300271B CN201510295652.7A CN201510295652A CN106300271B CN 106300271 B CN106300271 B CN 106300271B CN 201510295652 A CN201510295652 A CN 201510295652A CN 106300271 B CN106300271 B CN 106300271B
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Abstract
A kind of detection method and converter plant fit applications of soft start failure, detection method includes the following steps：Converter plant is connected and is loaded；The energy-storage units that the controller of converter plant measures converter plant have first voltage level；The inverter circuit generation of converter plant outputs current to load；Controller measures energy-storage units and switchs to second voltage level by first voltage level；Controller generates reference voltage level according to output current, and judges whether first voltage level and the voltage difference of second voltage level are more than reference voltage level；When voltage difference is more than reference voltage level, controller judges whether the Voltage Peak of energy-storage units is less than setting value to peak value；If so, controller control inverter circuit stopping outputs current to load.
Description
Technical field
The detection method and converter plant that the present invention fails about a kind of soft start.
Background technology
Motor is the electrical equipment that can be converted electrical energy into kinetic energy, and then drive other devices, is industrially used such as
Large-scale motor, or fan motor common at home, the even small-sized or micro motor of running gear, nowhere lose motor
Trace.The appearance of motor not only promotes the progress of science and technology, while also offering convenience for the mankind.
However, motor, in conversion process of energy, part electric energy is converted into thermal energy and is consumed so that the conversion of kinetic energy
Measure transfer efficiency that is less, and then reducing energy.For this purpose, part dealer by frequency converter come drive motor, to adjust motor work
Make the frequency and amplitude of voltage, and then control motor rotary speed and torque, to promote the transfer efficiency of the energy.
But, although having soft starting device in frequency converter, it can avoid input voltage and generate surge current and element is made to damage
It is bad, thus the mode of can arrange in pairs or groups soft start resistance and relay, but there is when soft starting device fails and persistently load to export, it is soft
Start-up resistor is easy to have the hidden danger caught fire because temperature is excessively high.
Invention content
The detection method and a converter plant fit applications of a kind of soft start failure according to the present invention.Converter plant includes
One energy-storage units, an inverter circuit and a controller.Detection method includes the following steps：By one load of converter plant connection；Control
Device processed, which measures energy-storage units, has a first voltage level；Inverter circuit generates one and outputs current to load；Controller measures storage
Energy unit switchs to a second voltage level by first voltage level；Controller generates a reference voltage level according to output current, and
Judge whether first voltage level and the voltage difference of second voltage level are more than reference voltage level；When voltage difference is more than reference
Voltage value, controller judge whether the Voltage Peak of energy-storage units is less than a setting value to peak value；And when Voltage Peak is small to peak value
In setting value, controller control inverter circuit stopping outputs current to load.
In one embodiment, reference voltage level is a resistance of the soft starting circuit according to output current and converter plant
Value generates.
A kind of converter plant according to the present invention includes a conversion circuit, a soft starting circuit, an energy-storage units, an inversion
Circuit and a controller.Conversion circuit receives a power supply signal, and exports a direct current signal according to this.Soft starting circuit receives straight
Flow signal.Energy-storage units connect soft starting circuit, and direct current signal fills energy-storage units by soft starting circuit can be to one first electricity
Press level.Inverter circuit connects soft starting circuit and energy-storage units.Controller controls inverter circuit and exports an output current.Wherein
When inverter circuit generation outputs current to a load, energy-storage units switch to a second voltage level by first voltage level, and
Controller generates a reference voltage level according to output current, and judges the voltage difference of first voltage level and second voltage level
Whether reference voltage level is more than.When voltage difference is more than reference voltage level, controller judges the Voltage Peak of energy-storage units to peak value
Whether a setting value is less than.When Voltage Peak is less than setting value to peak value, inverter circuit stopping outputs current to load.
In one embodiment, power supply signal is DC power signal or ac supply signal.
In one embodiment, conversion circuit is bridge rectifier or three-phase rectifier.
In one embodiment, soft starting circuit includes a resistance and a relay.One end of resistance connects relay simultaneously
One end and conversion circuit, and the other end of resistance connects the other end and energy-storage units of relay simultaneously.
In one embodiment, soft starting circuit includes a resistance and a thyristor.One end of resistance connects thyristor simultaneously
One end and conversion circuit, and the other end of resistance connects the other end and energy-storage units of thyristor simultaneously.
In one embodiment, energy-storage units include an at least capacitor.
In one embodiment, inverter circuit is half-bridge inverter, full-bridge inverter or three-phase inverter.
From the above, the present invention can determine whether soft starting circuit has failed by the detection and operation of controller, in turn
The running for stopping converter plant burning hidden danger even on fire to avoid resistance because temperature is excessively high.In addition, the present embodiment is not
Need additionally to install element in can detect whether soft starting circuit fails on converter plant, thus will not additionally increase product at
This, and the effect of protecting product can be reached.
Description of the drawings
Fig. 1 is a kind of circuit diagram of converter plant of present pre-ferred embodiments；
Fig. 2A is the schematic diagram of soft starting circuit；
Fig. 2 B are another schematic diagram of soft starting circuit；
Fig. 3 A are voltage sequence diagram of the energy-storage units in soft starting circuit normal operation；
Fig. 3 B are voltage sequence diagram of the energy-storage units when soft starting circuit fails；
Fig. 4 is the detection method flow chart that a kind of soft start of present pre-ferred embodiments fails；
Fig. 5 is a kind of circuit diagram of converter plant of another embodiment of the present invention.
Wherein, reference numeral：
1：Conversion circuit
2、2a：Soft starting circuit
21：Resistance
22：Relay
23：Thyristor
3：Inverter circuit
4：Controller
5：Energy-storage units
L：Load
P：Power supply signal
S1：Direct current signal
S2：Output current
S01~S09：Step
T0：Initial time point
T1：First time point
T2：Second time point
T3：Third time point
V、Va：Converter plant
V1：First voltage level
V2：Second voltage level
Vm：Voltage difference
Vp-p：Voltage Peak is to peak value
Specific implementation mode
Hereinafter with reference to correlative type, illustrate according to present pre-ferred embodiments a kind of soft start fail detection method and
Converter plant, wherein identical element will be illustrated with identical reference marks.
Fig. 1 is a kind of circuit diagram of converter plant of present pre-ferred embodiments.It please refers to shown in Fig. 1, frequency conversion dress
It sets V and can be applied to a load L (being, for example, motor), and include a conversion circuit 1, a soft starting circuit 2, an inverter circuit 3, one
Controller 4 and an energy-storage units 5.Conversion circuit 1 connects soft starting circuit 2, and soft starting circuit 2 connects inverter circuit 3 and storage
Energy unit 5, and controller 4 couples energy-storage units 5 and inverter circuit 3.
Conversion circuit 1 receives a power supply signal P, and exports a direct current signal S1 according to this.In the present embodiment, conversion circuit
1 is bridge rectifier, and power supply signal P is ac supply signal, can be via exporting direct current signal after 1 rectification of conversion circuit
S1.In addition, conversion circuit 1 can be three-phase rectifier or other rectification circuits, it is not restricted herein.
Soft starting circuit 2 receives direct current signal S1 to carry out soft start.Direct current signal S1 is by soft starting circuit 2 to energy storage
Unit 5 fills can be to a first voltage level V1 (as shown in Figure 3A).
In the present embodiment, energy-storage units 5 are by taking a capacitor as an example, and in other embodiments, energy-storage units 5 can be with
For the combination of multiple capacitors, for example, it is in series or in parallel with each other, and then it is equivalent to a capacitor.In this, this capacitor can quilt
Filling can be to first voltage level V1, to provide the input voltage of the stabilization of inverter circuit 3.
It please arranges in pairs or groups together shown in Fig. 1 and Fig. 2A, wherein Fig. 2A is the schematic diagram of soft starting circuit.In the present embodiment, soft
Start-up circuit 2 includes a resistance 21 and a relay 22.One end of resistance 21 connects one end and the conversion electricity of relay 22 simultaneously
Road 1, and the other end of resistance 21 connects the other end and energy-storage units 5 of relay 22 simultaneously.In other words, resistance 21 and relay
After device 22 is connected in parallel, then it is series between conversion circuit 1 and energy-storage units 5.It is noted that resistance 21 can be multiple
The combination of resistor, for example, it is in series or in parallel with each other, and then it is equivalent to a resistor.In this, this resistance 21 has a resistance
Value R so that direct current signal S1 flows through resistance 21 and causes pressure drop, and will not occur surge current to energy-storage units 5.
It is noted that in some embodiments, as shown in Figure 2 B, replaceable relay 22 is a thyristor
(thyristor) 23, anode tap connects conversion circuit 1, and cathode terminal connects energy-storage units 5, and control terminal couples controller 4.
Inverter circuit 3 connects soft starting circuit 2 and energy-storage units 5, and direct current signal S1 is converted to alternating current and defeated
Go out an output current S2 to loading L.Wherein inverter circuit 3 can be half-bridge inverter, full-bridge inverter or three-phase inverter.
Controller 4 couples the output end of energy-storage units 5 and inverter circuit 3, to measure voltage on energy-storage units 5 and inverse
Become the output current (i.e. the current value of output current S2) of circuit 3, and then judges whether soft starting circuit 2 fails, meanwhile, control
Device 4 can control inverter circuit 3 to export output current S2.In addition, controller 4 may be, for example, microprocessor (Micro-
Processor), microcontroller (MCU), programmable gate array (FPGA or CPLD) or application-specific integrated circuit
(ASIC), it does not limit herein.
It please also refer to shown in Fig. 1, Fig. 2A and Fig. 3 A, wherein Fig. 3 A are energy-storage units in soft starting circuit normal operation
Voltage sequence diagram.Furthermore, (running initial stage, initial time point T0), relay when converter plant V couples power supply signal P
Device 22 remains open, thus direct current signal S1 will flow through resistance 21 and the energy-storage units 5 that arrive.It is neglected since resistance 21 can avoid circuit
It so receives surge current and generates damage, therefore have the function of protecting circuit element.Then, when controller 4 detects energy-storage units 5
After the completion of energy storage and when having first voltage level V1 (the first time point T1), controller 4 can control relay 22 to be connected, and make inverse
Become circuit 3 to start operation (the second time point T2), thus direct current signal S1 will change path and flow through relay 22 to inverter circuit
3, to generate output current S2 to loading L.Simultaneously, because energy-storage units 5, which constantly fill, can and release energy, controller 4 can be examined
Ripple or zigzag a little is presented in the voltage waveform surveyed on energy-storage units 5, and energy-storage units 5 have Voltage Peak to peak value at this time
Vp-p。
Then it please refers to shown in Fig. 3 B, is voltage sequence diagram of the energy-storage units when soft starting circuit fails.Work as relay
22 failure of device or damage and maintain to disconnect when can not be connected, direct current signal S1 is only capable of flowing through resistance 21, and controller 4 measures energy storage
After the completion of 5 energy storage of unit and when there is first voltage level V1 (the first time point T1), still inverter circuit 3 can be made to start operation
(the second time point T2), to generate output current S2 to loading L.Simultaneously, due to being generated when direct current signal S1 flows through resistance 21
Pressure drop, therefore controller 4 measures the voltage on energy-storage units 5 and is gradually converted into a second voltage level V2.Then, work as controller
When 4 voltages for measuring on energy-storage units 5 are second voltage level V2 (third time point T3), controller 4 will be according to output current S2
Generate a reference voltage level Vr, especially resistance value (the i.e. resistance 21 according to the current value and soft starting circuit 2 of output current S2
Resistance value R) generate reference voltage level Vr, wherein reference voltage level Vr is current value and the soft starting circuit 2 of output current S2
Resistance value product, obtained multiplied by a correction factor C.It should be noted that due to the current value size meeting of output current S2
It is changed correspondingly because of different load L, therefore reference voltage level Vr is not a fixed default value, but according to output electricity
The reference value for flowing the variation of S2 and floating, such converter plant V could generate corresponding reference voltage level according to different load L
Vr, accurately to judge whether soft starting circuit 2 fails (as described later).
Then, controller 4 judges whether the voltage difference Vm of first voltage level V1 and second voltage level V2 is more than ginseng
Examine voltage value Vr.If so, the pressure difference of i.e. energy-storage units 5 is excessive, controller 4 judges the Voltage Peak of energy-storage units 5 to peak value Vp- again
Whether p is less than a setting value, when less than setting value, indicates that energy-storage units 5 have the ripple or zigzag of very little, i.e. energy storage list
Non- energy storage is to first voltage level V1 because of pressure drop for member 5, therefore in being still persistently electrically charged.It should be noted that because soft start sometimes
Although 2 no-failure of circuit, if loading, L is larger may still to cause above-mentioned voltage difference Vm excessive, therefore the present invention judges to store up again
Whether the Voltage Peak of energy unit 5 is less than setting value to peak value Vp-p, if because 2 no-failure of soft starting circuit, above-mentioned Voltage Peak pair
Peak value Vp-p can be larger, therefore is to determine soft starting circuit 2 to whether peak value Vp-p is less than setting value by Voltage Peak is judged
No certain failure, the setting value can suitably be selected according to actual design.Thereby, controller 4 judges formula via above-mentioned two, can push away
22 failure of relay is obtained, therefore controller 4 will control inverter circuit 3 and stop output output current S2 to L is loaded, to avoid resistance
21 temperature are excessively high and burn doubt even on fire.
In addition, conversion circuit 1 more can couple power supply signal P by a switch (not shown), and when controller 4 judges soft open
When dynamic circuit 2 fails, the more controllable switch of controller 4 disconnects, so that conversion circuit 1 stops receiving power supply signal P.
Thus, the present embodiment can determine whether soft starting circuit 2 has failed by the detection and operation of controller 4,
And then stop the running of converter plant V, to avoid resistance 21 hidden danger even on fire is burnt because temperature is excessively high.In addition, this reality
It applies example and does not need to additionally to install element in can detect whether soft starting circuit fails on converter plant V, therefore will not be additional
The effect of increasing product cost, and protection product can be reached.
Fig. 4 is the detection method flow chart that a kind of soft start of present pre-ferred embodiments fails.Please refer to Fig. 1 to Fig. 4
Shown, this detection method is and above-mentioned converter plant V fit applications, the wherein component structure of converter plant V and start explanation
On being specified in, seldom repeated in this.In this, detection method includes the following steps：By one load of converter plant connection
(S01)；Controller, which measures energy-storage units, has a first voltage level (S02)；Inverter circuit generates one and outputs current to load
(S03)；Controller measures energy-storage units and switchs to a second voltage level (S04) by first voltage level；Controller is according to output
Electric current generates a reference voltage level, and judges whether first voltage level and the voltage difference of second voltage level are more than with reference to electricity
Pressure value (S05)；When voltage difference is more than reference voltage level, controller judges whether the Voltage Peak of energy-storage units is less than one to peak value
Setting value (S06)；When Voltage Peak is less than setting value to peak value, controller control inverter circuit stopping outputs current to load
(S07)。
In step S02 and step S04, controller 4 can measure inverter output current to before loading with later, store up
The voltage change of energy unit 5.And step S03, when inverter circuit 3 supplies power to load L, energy-storage units 5 just start to release energy, and
Controller 4 can measure the current value of the output current S2 of inverter circuit 3, the i.e. output current value of converter plant V.
Then in step S05, the difference of the voltage change of energy-storage units 5 and reference voltage level are done into ratio via controller 4
Compared with judging whether soft starting circuit 2 has the possibility of failure according to this.And the Voltage Peak of energy-storage units 5 is judged by step S06 again
Whether setting value is less than to peak value Vp-p.If being less than setting value, just stop the running of converter plant V, to avoid soft starting circuit 2
It burns.Conversely, then converter plant V is normal operation (S09).In some embodiments, controller 4 can control conversion circuit 1 to stop
Only receive power supply signal P (S08).
It is a kind of circuit diagram of converter plant of another embodiment of the present invention shown in Fig. 5.This reality
The converter plant Va for applying example is roughly the same with the converter plant V of above-described embodiment, the difference is that, the soft start of the present embodiment
Circuit 2a be located at low-pressure side, and above-described embodiment be then in high-pressure side, and other starts with judge it is all identical, in this seldom go to live in the household of one's in-laws on getting married
It states.
In conclusion the present invention can determine whether soft starting circuit has failed by the detection and operation of controller, in turn
The running for stopping converter plant burning hidden danger even on fire to avoid resistance because temperature is excessively high.In addition, the present embodiment is not
Need additionally to install element in can detect whether soft starting circuit fails on converter plant, thus will not additionally increase product at
This, and the effect of protecting product can be reached.
The foregoing is merely illustratives, rather than are restricted person.Any spirit and scope without departing from the present invention, and to it
The equivalent modifications of progress or change should all belong to and the protection domain of appended claims of the present invention.
Claims (9)
1. a kind of detection method of soft start failure, which is characterized in that with a converter plant fit applications, which includes
One energy-storage units, an inverter circuit and a controller, detection method includes the following steps for this：
By one load of converter plant connection；
The controller, which measures the energy-storage units, has a first voltage level；
The inverter circuit generates one and outputs current to the load；
The controller measures the energy-storage units and switchs to a second voltage level by the first voltage level；
The controller generates a reference voltage level according to the output current, and judges the first voltage level and the second voltage position
Whether accurate voltage difference is more than the reference voltage level；
When the voltage difference is more than the reference voltage level, which judges whether the Voltage Peak of the energy-storage units is less than peak value
One setting value；And
When the Voltage Peak is less than the setting value to peak value, which controls inverter circuit stopping output, and this outputs current to this
Load.
2. detection method as described in claim 1, which is characterized in that the reference voltage level is according to the output current and the change
One resistance value of one soft starting circuit of frequency device generates.
3. a kind of converter plant, which is characterized in that including：
One conversion circuit receives a power supply signal, and exports a direct current signal according to this；
One soft starting circuit receives the direct current signal；
One energy-storage units connect the soft starting circuit, which fills the energy-storage units by the soft starting circuit can be extremely
One first voltage level；
One inverter circuit connects the soft starting circuit and the energy-storage units；And
One controller controls the inverter circuit and exports an output current；
Wherein when the inverter circuit, which generates this, outputs current to a load, which switchs to one by the first voltage level
Second voltage level, and the controller according to the output current generate a reference voltage level, and judge the first voltage level with
Whether the voltage difference of the second voltage level is more than the reference voltage level；
When the voltage difference is more than the reference voltage level, which judges whether the Voltage Peak of the energy-storage units is less than peak value
One setting value；
When the Voltage Peak is less than the setting value to peak value, which stops output, and this outputs current to the load.
4. converter plant as claimed in claim 3, which is characterized in that the power supply signal is DC power signal or AC power
Signal.
5. converter plant as claimed in claim 3, which is characterized in that the conversion circuit is bridge rectifier or three phase rectifier
Device.
6. converter plant as claimed in claim 3, which is characterized in that the soft starting circuit includes a resistance and a relay,
One end of the resistance connects one end and conversion circuit of the relay simultaneously, and the other end of the resistance connects the relay simultaneously
The other end of device and the energy-storage units.
7. converter plant as claimed in claim 3, which is characterized in that the soft starting circuit includes a resistance and a thyristor,
One end of the resistance connects one end and conversion circuit of the thyristor simultaneously, and the other end of the resistance connects the lock stream simultaneously
The other end of body and the energy-storage units.
8. converter plant as claimed in claim 3, which is characterized in that the energy-storage units include an at least capacitor.
9. converter plant as claimed in claim 3, which is characterized in that the inverter circuit be half-bridge inverter, full-bridge inverter,
Or three-phase inverter.
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| CN201510295652.7A CN106300271B (en) | 2015-06-03 | 2015-06-03 | The detection method and converter plant of soft start failure |
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| CN201510295652.7A CN106300271B (en) | 2015-06-03 | 2015-06-03 | The detection method and converter plant of soft start failure |
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| CN106300271B true CN106300271B (en) | 2018-09-28 |
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| CN107561384A (en) * | 2017-08-25 | 2018-01-09 | 广州七喜智能设备有限公司 | Frequency converter is soft to open resistance tolerance impact capacity test device and method |
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| US6804127B2 (en) * | 2002-11-19 | 2004-10-12 | Wilcon Inc. | Reduced capacitance AC/DC/AC power converter |
| CN101436822A (en) * | 2007-11-14 | 2009-05-20 | 台达电子工业股份有限公司 | Soft startup protection detection device and method for frequency changer |
| US8076896B2 (en) * | 2006-06-28 | 2011-12-13 | Kabushiki Kaisha Yaskawa Denki | Inverter controller and method for operating the same |
| TW201419746A (en) * | 2012-11-02 | 2014-05-16 | Universal Scient Ind Co Ltd | Soft-start voltage regulator |
| CN203747642U (en) * | 2014-03-21 | 2014-07-30 | 南京科远驱动技术有限公司 | Frequency converter soft start circuit |
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| US6804127B2 (en) * | 2002-11-19 | 2004-10-12 | Wilcon Inc. | Reduced capacitance AC/DC/AC power converter |
| US8076896B2 (en) * | 2006-06-28 | 2011-12-13 | Kabushiki Kaisha Yaskawa Denki | Inverter controller and method for operating the same |
| CN101436822A (en) * | 2007-11-14 | 2009-05-20 | 台达电子工业股份有限公司 | Soft startup protection detection device and method for frequency changer |
| TW201419746A (en) * | 2012-11-02 | 2014-05-16 | Universal Scient Ind Co Ltd | Soft-start voltage regulator |
| CN203747642U (en) * | 2014-03-21 | 2014-07-30 | 南京科远驱动技术有限公司 | Frequency converter soft start circuit |
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