CN203377777U - A soft start circuit of an auxiliary power supply - Google Patents
A soft start circuit of an auxiliary power supply Download PDFInfo
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- CN203377777U CN203377777U CN201320488745.8U CN201320488745U CN203377777U CN 203377777 U CN203377777 U CN 203377777U CN 201320488745 U CN201320488745 U CN 201320488745U CN 203377777 U CN203377777 U CN 203377777U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a soft start circuit of an auxiliary power supply. The soft start circuit comprises a switch component, a current-limiting resistor and a soft start control circuit. The switch component comprises a control switch and a switch control unit; the control switch is connected with the current-limiting resistor in parallel; the switch control unit is connected with the soft start control circuit and is used for controlling the on/off of the control switch according to the output of the soft start control circuit. The soft start circuit of the auxiliary power supply can prevent occurrence of larger impact current when the auxiliary power supply is started and is capable of starting the resistor timely and reliably in a short circuit mode after charging is completed for reducing unnecessary loss, thereby preventing elements from suffering the impact at the time of start and prolonging the service lifetimes of the elements.
Description
Technical field
The utility model relates to field of power supplies, relates in particular to a kind of soft circuit of accessory power supply.
Background technology
High-power photovoltaic inverter is in order to pass through by low voltage crossing and no-voltage; usually at secondary power system, jumbo storage capacitor is set; this causes accessory power supply, when starting, very large impulse current is arranged, and protectiveness parts selection and element are had a significant impact useful life.The utility model, by increasing current-limiting circuit, makes starting current ease down to the acceptable scope.
High-power photovoltaic inverter auxiliary equipment electric power system is comparatively complicated, and what have needs alternating current, and what have needs direct current, and power demand is more.The power supply that is generally the power supply of these auxiliary equipment all by isolating transformer directly from the power taking of three-phase alternating current electrical network.By the requirement of department of State Grid, the high-power photovoltaic synchronization inverter must possess low voltage ride-through function, so-called low voltage crossing refers to when the grid-connected point voltage of combining inverter falls, it is grid-connected that combining inverter can keep, even can provide certain reactive power to electrical network, support operation of power networks, until power system restoration is normal, thus " passing through " this low-voltage time.According to relevant national standard, this low voltage point only has 20% of rated voltage usually, and may be set as lower point follow-up, and the duration is generally 2 seconds.Between this low-voltage area, the secondary power system input voltage is far below its specified input voltage range, if do not adopt other measures, secondary power system can't work, and inverter also can't work, and can't pass through low-voltage.Usually the employing measure is to amplify electric capacity as energy-storage units in the middle of secondary power system now, between low-voltage area, by storage capacitor, is the secondary power system power supply.For guaranteeing that secondary power system is passing through the interval normal energy supply that obtains; storage capacitor is obtained larger usually; be generally several ten thousand microfarads; this causes when auxiliary power supply of photovoltaic inverter starts, and storage capacitor will be charged to rated voltage from 0 voltage, due to the characteristic of electric capacity itself; this will cause very large impulse current; usually up to tens peaces, very large to the impact of element, also have to select rated value than the protection device of large more than 10 times of normal input current simultaneously.
The utility model content
The purpose of this utility model is to propose a kind of soft circuit of accessory power supply, solves above technical problem.
For reaching this purpose, the utility model by the following technical solutions:
A kind of soft circuit of accessory power supply comprises: switch block, current-limiting resistance and soft control circuit;
Described switch block comprises control switch and switch control unit, described control switch is in parallel with described current-limiting resistance, described switch control unit connects described soft and controls circuit, for according to described soft the output of controlling circuit, controls the closure of described control switch/disconnection.
Preferably, described accessory power supply comprises power module, and described power module comprises high level signal output and low level signal output, is used to described soft control circuit that the Power supply port is provided, and is described soft and controls circuit supply;
Described soft control circuit comprises sample circuit, comparison circuit and triode;
Described sample circuit comprises resistance R 7, R8, R9, R10 and the first operational amplifier, one end of resistance R 7 connects the first end of described current-limiting resistance, resistance R 9 connects the second end of described current-limiting resistance, the other end of resistance R 7 connects the positive input terminal of described the first operational amplifier, the other end of one end contact resistance R7 of resistance R 8, the described low level signal output of another termination of resistance R 8, one end of resistance R 10 connects the output of described the first operational amplifier, and the other end of resistance R 10 connects the negative input end of the first operational amplifier;
Described comparison circuit comprises resistance R 3, R4 and the second operational amplifier, the end of R3 connects the positive input terminal of described the second operational amplifier, the described low level signal output of another termination of R3, the described high level signal output of a termination of R4, the other end of R4 connects the positive input terminal of described the second operational amplifier, the output of described the first amplifier amplifier connects the negative input end of described the second operational amplifier, and the output of described the second operational amplifier connects the base stage of described triode; The emitter of described triode connects described low level signal output, and the collector electrode of described triode connects described switch control unit.
Preferably, described accessory power supply also comprises rectifier bridge and storage capacitor, the first end of described current-limiting resistance connects the first output of described rectifier bridge, the second end of described current-limiting resistance connects the first end of described storage capacitor, and the second end of described storage capacitor connects the second output of described rectifier bridge.
Preferably, be connected with low pass filter between the negative input end of the output of described the first operational amplifier and described the second operational amplifier; Described low pass filter comprises filter resistance and filter capacitor, one end of described filter resistance connects the output of described the first operational amplifier, the other end of described filter resistance connects the negative input end of described the second operational amplifier, one end of described filter capacitor connects the other end of described filter resistance, and the other end of described filter capacitor connects described low level signal output.
Preferably, described switch control unit comprises solenoid, one end of described solenoid connects the collector electrode of described triode, the described high level signal output of another termination of described solenoid, drive the on/off electricity of described solenoid by the collector electrode output voltage of described triode, closed or disconnect described control switch.
Preferably, the two ends of described storage capacitor connect the input of described power module.
Preferably, described accessory power supply also comprises transformer, and the input of described transformer connects AC power, and the output of described transformer connects the input of described rectifier bridge.
Preferably, described switch control unit also comprises diode, and described diode adopts the high diode of reverse breakdown voltage, and the maximum operating currenbt of described diode will surpass the operating current of described switch block.
Preferably, described control switch adopts relay or contactor.
The beneficial effects of the utility model: soft circuit of described accessory power supply comprises switch block, current-limiting resistance, control circuit for soft, described switch block comprises control switch and switch control unit, described control switch is in parallel with described current-limiting resistance, described switch control unit connects described soft and controls circuit, for controlling the closure of described control switch/disconnection, when auxiliary power start, starting current by the current-limiting resistance limiting circuit, avoided the auxiliary power start initial stage larger impulse current to occur, while having avoided like this starting to the impact of the circuit element of secondary power system, extended the useful life of element, at auxiliary power start after a period of time, control electric circuit inspection for soft and reduce to the system rated value to electric current, export a level signal to switch control unit, switch control unit makes the control switch closure, by the current-limiting resistance short circuit, so not only solved the excessive problem of impulse current, extended the useful life of element, and circuit is simple, easily realize and can be in real time by the current-limiting resistance short circuit, avoid unnecessary energy loss.
The accompanying drawing explanation
Fig. 1 is the system circuit diagram of soft circuit of a kind of accessory power supply of the utility model the first embodiment.
Fig. 2 is the system circuit diagram of soft circuit of accessory power supply of the high-power photovoltaic inverter of second embodiment of the utility model.
In figure:
101, transformer; 102, rectifier bridge; 103, storage capacitor; 104, power module; 105, switch block; 106, current-limiting resistance; 107, sample circuit; 108, low pass filter; 109, comparison circuit; 110, triode; 111, photovoltaic DC-to-AC converter.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with accompanying drawing and by specific embodiment.
Please refer to Fig. 1, accessory power supply comprises: transformer 101, rectifier bridge 102, storage capacitor 103, power module 104 and DC output end.
Conventional, the input of transformer 101, it is the ac input end of accessory power supply, connect AC power, for accessory power supply provides AC-input voltage, the output of transformer 101 connects the input of rectifier bridge 102, and the first output of rectifier bridge 102 connects the first end of storage capacitor 103, the second end of storage capacitor 103 connects the second output of rectifier bridge 102, and the two ends of storage capacitor 103 connect respectively two inputs of power module 104.
AC power provides the AC-input voltage of accessory power supply, after transformer 101 carries out transformation, export to rectifier bridge 102, rectifier bridge 102 is changed the alternating voltage after transformation through AC-DC, realize the alternating voltage of input is converted into the direct voltage of output, according to different demands, rectifier bridge 102 adopts full-bridge and/or half-bridge, two outputs of rectifier bridge 102 connect the two ends of storage capacitor 103, are used to storage capacitor 103 to fill energy.
When auxiliary power start, storage capacitor 103 will be charged to rated voltage from 0 voltage, characteristic due to electric capacity itself, when there is no soft circuit, because input is very little to the equiva lent impedance of storage capacitor 103, and storage capacitor 103 rises to the large energy of rated voltage needs from 0 voltage, therefore will cause very large impulse current, usually up to tens peaces, very large to the impact of element, need in accessory power supply, increase soft circuit.
Please refer to Fig. 1, the system circuit diagram of soft circuit of the accessory power supply that Fig. 1 is the utility model the first embodiment, produce the problem of excessive impulse current while having solved auxiliary power start, and soft circuit of this accessory power supply comprises:
Switch block 105, current-limiting resistance 106 and soft control circuit; Switch block 105 comprises control switch and switch control unit, control switch is in parallel with current-limiting resistance 106, the first end of current-limiting resistance 106 connects rectifier bridge 102 first outputs, the second end of current-limiting resistance 106 connects the first end of storage capacitor 103, and the second end of storage capacitor 103 connects the second output of rectifier bridge 102; Switch control unit connects soft and controls circuit, for the output level of controlling circuit according to soft, makes the control switch closure or disconnects.
When auxiliary power start, AC-input voltage is exported to rectifier bridge 2 after transformer 101 carries out transformation, carry out the AC-DC conversion through arranging bridge 102 again, for storage capacitor 103 fills energy, because accessory power supply just starts, the voltage of storage capacitor 103 is 0 volt, therefore power module 104 is in off-mode, can't provide low-voltage DC for switch control unit, therefore control switch is in off-state, the first output of rectifier bridge 102 is connected to the first end of storage capacitor 103 by current-limiting resistance 106, existence due to current-limiting resistance, to make inrush current limitation at a finite value, suppose that the voltage after rectification is U, the resistance of current-limiting resistance 105 is R, the voltage of storage capacitor 103 is 0 volt, while starting, electric current will be less than
from formula, can find out, resistance is larger, and starting current will be less.And when soft circuit arranged, can make inrush current limitation in rational scope by selecting suitable current-limiting resistance, make the voltage of storage capacitor 103 progressively increase, rather than picture without soft circuit in the moment rising, reduced the impact to element; When storage capacitor 103 energy storage complete, provide power module 104 high-voltage DC power supplies, power module 104 is brought into operation, for switch control unit provides low-voltage DC, make the control switch closure, by current-limiting resistance 106 short circuits, because the control switch resistance after closure is very little, electric current will no longer pass through from current-limiting resistance 106, and limiting resistance 106 is in bypass condition, no longer consumed energy, so not only solved the excessive problem of impulse current, extended the useful life of element, and circuit is simple, easily realizes and can avoid unnecessary energy loss.
Concrete, switch control unit connects soft and controls circuit; Power module 104 provides low level signal (earth signal) output and high level signal (VCC) output, high/low level signal output is connected with soft control circuit, be used to described soft control circuit that the Power supply port is provided, be described soft and control circuit supply.
Wherein, soft control circuit comprises sample circuit 107, comparison circuit 109, low pass filter 108 and triode 110.
Sample circuit 107 consists of resistance R 7, R8, R9, R10 and the first operational amplifier, one end of resistance R 7 connects the first end of current-limiting resistance 106, resistance R 9 connects the second end of current-limiting resistance 106, the other end of resistance R 7 connects the positive input terminal of the first operational amplifier, the other end of one end contact resistance R7 of resistance R 8, the low level signal output that another termination power module 104 of resistance R 8 provides, one end of resistance R 10 connects the output of the first operational amplifier, and the other end of resistance R 10 connects the negative input end of the first operational amplifier;
Comparison circuit 109 comprises resistance R 3, R4 and the second operational amplifier, the end of R3 connects the positive input terminal of the second operational amplifier, another termination low level signal output of R3, the termination high level signal output of R4, the other end of R4 connects the positive input terminal of the second operational amplifier, the output of the first amplifier amplifier connects the negative input end of the second operational amplifier, the base stage of the output connecting triode 110 of the second operational amplifier, the emitter of triode 110 connects the low level signal output, one end of the collector electrode connecting valve control unit of triode 110, another termination high level signal output of switch control unit.
Be connected with low pass filter 108 between the negative input end of the output of the first operational amplifier and the second operational amplifier; Low pass filter 108 comprises filter resistance R2 and filter capacitor C2, the end of filter resistance R2 connects the output of the first operational amplifier, the other end of filter resistance R2 connects the negative input end of the second operational amplifier, the end of filter capacitor C2 connects the other end of filter resistance R2, the low level signal output of another termination power module 104 of filter capacitor C2.
In the process risen at the voltage of storage capacitor 103, when voltage reaches the starting resistor of power module 104, power module 104 will start.After power initiation, soft circuit of accessory power supply will obtain normal power supply supply.In soft process, on current-limiting resistance 106, will there is larger electric current to pass through, establishing electric current is i
1, the resistance of current-limiting resistance is R1, the voltage at current resistor two ends is V
1=R
1* i
1.Soft complete after, current i
1to reduce to normal value, the voltage V at current-limiting resistance two ends
1=R
1* i
1also will reduce to normal value.The difference channel that sample circuit 107 is comprised of resistance R 7, R8, R9, R10 and the first operational amplifier forms, resistance R7=R9 wherein, R8=R10.The low pass filter filters out radio-frequency component formed by R2, C2, retain low frequency flip-flop, and the output voltage of establishing this filter is V2, has
form comparison circuit by resistance R 3, R4 and the second operational amplifier, resistance R 4 forms bleeder circuits with resistance R 3, is used for setting the voltage of the positive input terminal of the second operational amplifier, and establishing this voltage is V3.Known, work as V
2<V
3the time, soft completes, and the second operational amplifier output high level, drive triode 110 conductings, the closing relay coil, switch is by closure, by current-limiting resistance 106 short circuits, because the switch resistance after closure is very little, electric current will no longer pass through from current-limiting resistance 106, by switch block, be directly secondary power system power supply, limiting resistance 106 is in bypass condition, no longer consumed energy.
To be soft time change with the variation of AC-input voltage the advantage of this soft circuit, if AC-input voltage is higher, storage capacitor 103 charging currents will be large, storage capacitor 103 charging processes will be relatively shorter, like this voltage V2 on current-limiting resistance will be early lower than set point V3, control switch will be closed earlier, to avoid consuming electric energy.
Concrete, switch block 105 adopts any realization of relay, contactor or other controlled power devices, wherein, switch control unit comprises solenoid, the collector electrode of one end connecting triode 110 of solenoid, the high level signal output of another termination power module 104 of solenoid, control the on/off electricity of solenoid by the collector electrode output voltage of triode 110, thereby closed or disconnect control switch.
Concrete, switch control unit also comprises diode D1, and diode D1 adopts the high diode of reverse breakdown voltage, and its maximum operating currenbt also will surpass the operating current of switch block 105.Diodes in parallel is at the relay two ends, the cut-off state of diode in reverse biased while making relay work, and while disconnecting relay, diode is the inductance afterflow in relay, prevents that large voltage burns out device or produces spark.
Concrete, the operational amplifier in the present embodiment can adopt the general-purpose operation amplifier to realize, as devices such as LM258.LM258 inside include two independently, the dual operational amplifier of high-gain, internal frequency compensation, being suitable for the very wide single supply of supply voltage scope uses, also be applicable to the duplicate supply mode of operation, under the condition of work of recommending, source current and independent of power voltage.Its scope of application comprises the occasion of the use operational amplifier of sensor amplifier, DC current gain module and other all available single power supplies.
Whole soft control circuit is simple, be easy to realize, and the super-high-current while but well having realized having reduced circuit start, and also effect is remarkable; The set positions scheme of soft circuit in the present embodiment is only a kind of preferred version in addition, quantity and the position of soft circuit of accessory power supply can be adjusted according to actual needs, for example, in the front of transformer 101, or the centre of rectifier 102 and transformer 101, only need on circuit, change and can realize a little.
Please refer to Fig. 2, the system circuit diagram of soft circuit of the accessory power supply of the high-power photovoltaic inverter that Fig. 2 is second embodiment of the utility model, system circuit diagram when soft the circuit that shows accessory power supply is applied to high-power photovoltaic inverter, produce the problem of excessive impulse current while having solved the auxiliary power start of high-power photovoltaic inverter.Wherein, photovoltaic module is connected with the input of photovoltaic DC-to-AC converter 111, and the output of photovoltaic DC-to-AC converter 111 is linked electrical network by connecting external transformer, is the electrical network output voltage.
The auxiliary equipment of photovoltaic DC-to-AC converter is powered by accessory power supply, and the output of accessory power supply comprises: high voltage direct current and low-voltage DC; Low-voltage DC can adopt a plurality of power modules.
Please refer to Fig. 2, DC1 and DC2 mean respectively low-voltage direct, be generally+15V and+12V, be for other circuit of photovoltaic DC-to-AC converter as power supplies such as modulate circuit, control circuits, voltage difference just.VCC is for soft circuit relay and soft other circuit supplies, is generally 12V.
DC+ and DC-are high voltage direct current, are that the auxiliary equipment input can, from the high direct voltage power taking, also can have independently isolation rectification filtering system for the A.C. contactor line bag power supply of the ac output end of photovoltaic DC-to-AC converter 111.
Photovoltaic DC-to-AC converter is output as 3 outputs mutually, is respectively R phase, S phase and T phase, and 3 export the ac input end that is connected to accessory power supply mutually, for accessory power supply provides AC-input voltage, and the auxiliary equipment power supply that accessory power supply is photovoltaic DC-to-AC converter 111.
Soft circuit of accessory power supply comprises:
Switch block 105, current-limiting resistance 106 and soft control circuit; Switch block 105 comprises control switch and switch control unit, control switch is in parallel with current-limiting resistance 106, the first end of current-limiting resistance 106 connects rectifier bridge 102 first outputs, the second end of current-limiting resistance 106 connects the first end of storage capacitor 103, and the second end of storage capacitor 103 connects the second output of rectifier bridge 102; Switch control unit connects soft and controls circuit, for the output level of controlling circuit according to soft, makes the control switch closure or disconnects.
When auxiliary power start, AC-input voltage is exported to rectifier bridge 102 after transformer 101 carries out transformation, carry out the AC-DC conversion through arranging bridge 102 again, for storage capacitor 103 fills energy, because accessory power supply just starts, the voltage of storage capacitor 103 is 0 volt, therefore power module 104 is in off-mode, can't provide low-voltage DC for switch control unit, therefore control switch is in off-state, the first output of rectifier bridge 102 is connected to the first end of storage capacitor 103 by current-limiting resistance 106, existence due to current-limiting resistance, to make inrush current limitation at a finite value, suppose that the voltage after rectification is U, the resistance of current-limiting resistance 105 is R, storage capacitor 103 voltages are 0 volt, while starting, electric current will be less than
from formula, can find out, resistance is larger, and starting current will be less.And when soft circuit arranged, can make inrush current limitation in rational scope by selecting suitable current-limiting resistance, make storage capacitor voltage progressively increase, rather than picture without soft circuit in the moment rising, reduced the impact to element; When storage capacitor 103 energy storage complete, provide power module 104 high-voltage DC power supplies, power module 104 is brought into operation, for switch control unit provides low-voltage DC, make the control switch closure, by current-limiting resistance 106 short circuits, because the control switch resistance after closure is very little, electric current will no longer pass through from current-limiting resistance 106, and limiting resistance 106 is in bypass condition, no longer consumed energy, so not only solved the excessive problem of impulse current, extended the useful life of element, and circuit is simple, easily realizes and can avoid unnecessary energy loss.
The storage capacitor 103 of the accessory power supply of photovoltaic DC-to-AC converter 111 will be charged to rated voltage from 0 voltage; characteristic due to electric capacity itself; this will cause very large impulse current; usually up to tens peaces; impact to element is very large, also has to select rated value than the protection device of large more than 10 times of normal input current simultaneously.The present embodiment by increasing soft circuit in accessory power supply, and when auxiliary power start, the charging current of restriction storage capacitor 103, progressively rise the voltage of storage capacitor 103, avoided the auxiliary power start initial stage larger impulse current to occur.To the impact of element, extended the useful life of element while so not only having avoided startup, the more important power that can consume in normal operation according to secondary power system be selected suitable protection device, in order to protect in time secondary power system when abnormal.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (9)
1. soft circuit of an accessory power supply, is characterized in that, comprising: switch block, current-limiting resistance and soft control circuit;
Described switch block comprises control switch and switch control unit, described control switch is in parallel with described current-limiting resistance, described switch control unit connects described soft and controls circuit, for according to described soft the output of controlling circuit, controls the closure of described control switch/disconnection.
2. soft circuit of accessory power supply according to claim 1, it is characterized in that, described accessory power supply comprises power module, described power module comprises high level signal output and low level signal output, be used to described soft control circuit that the Power supply port is provided, be described soft and control circuit supply;
Described soft control circuit comprises sample circuit, comparison circuit and triode;
Described sample circuit comprises resistance R 7, R8, R9, R10 and the first operational amplifier, one end of resistance R 7 connects the first end of described current-limiting resistance, resistance R 9 connects the second end of described current-limiting resistance, the other end of resistance R 7 connects the positive input terminal of described the first operational amplifier, the other end of one end contact resistance R7 of resistance R 8, the described low level signal output of another termination of resistance R 8, one end of resistance R 10 connects the output of described the first operational amplifier, and the other end of resistance R 10 connects the negative input end of the first operational amplifier;
Described comparison circuit comprises resistance R 3, R4 and the second operational amplifier, the end of R3 connects the positive input terminal of described the second operational amplifier, the described low level signal output of another termination of R3, the described high level signal output of a termination of R4, the other end of R4 connects the positive input terminal of described the second operational amplifier, the output of described the first amplifier amplifier connects the negative input end of described the second operational amplifier, and the output of described the second operational amplifier connects the base stage of described triode; The emitter of described triode connects described low level signal output, and the collector electrode of described triode connects described switch control unit.
3. soft circuit of accessory power supply according to claim 1, it is characterized in that, described accessory power supply also comprises rectifier bridge and storage capacitor, the first end of described current-limiting resistance connects the first output of described rectifier bridge, the second end of described current-limiting resistance connects the first end of described storage capacitor, and the second end of described storage capacitor connects the second output of described rectifier bridge.
4. soft circuit of accessory power supply according to claim 2, is characterized in that, between the negative input end of the output of described the first operational amplifier and described the second operational amplifier, is connected with low pass filter; Described low pass filter comprises filter resistance and filter capacitor, one end of described filter resistance connects the output of described the first operational amplifier, the other end of described filter resistance connects the negative input end of described the second operational amplifier, one end of described filter capacitor connects the other end of described filter resistance, and the other end of described filter capacitor connects described low level signal output.
5. soft circuit of accessory power supply according to claim 2, it is characterized in that, described switch control unit comprises solenoid, one end of described solenoid connects the collector electrode of described triode, the described high level signal output of another termination of described solenoid, drive the on/off electricity of described solenoid by the collector electrode output voltage of described triode, closed or disconnect described control switch.
6. soft circuit of accessory power supply according to claim 3, is characterized in that, the two ends of described storage capacitor connect the input of described power module.
7. soft circuit of accessory power supply according to claim 3, is characterized in that, described accessory power supply also comprises transformer, and the input of described transformer connects AC power, and the output of described transformer connects the input of described rectifier bridge.
8. soft circuit of accessory power supply according to claim 5, it is characterized in that, described switch control unit also comprises diode, and described diode adopts the high diode of reverse breakdown voltage, and the maximum operating currenbt of described diode will surpass the operating current of described switch block.
9. soft circuit of accessory power supply according to claim 1, is characterized in that, described control switch adopts relay or contactor.
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| CN201320488745.8U CN203377777U (en) | 2013-08-09 | 2013-08-09 | A soft start circuit of an auxiliary power supply |
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| CN104104217A (en) * | 2014-07-08 | 2014-10-15 | 安徽金峰新能源股份有限公司 | Power energy storage module for under-voltage protection of 500kW and 630kW photovoltaic inverter |
| CN104198853A (en) * | 2014-08-27 | 2014-12-10 | 江苏科技大学 | Wind power grid integration testing device and testing method |
| CN105071668A (en) * | 2015-07-30 | 2015-11-18 | 苏州景新电气有限公司 | Special-purpose power supply module for power supply of photovoltaic inverter |
| CN107219427A (en) * | 2017-06-27 | 2017-09-29 | 天津市滨海新区军民融合创新研究院 | Power supply circuit and electromagnetic compatibility test system |
| CN108347161A (en) * | 2017-01-25 | 2018-07-31 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter soft starting circuit and frequency converter comprising it |
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| CN104104217A (en) * | 2014-07-08 | 2014-10-15 | 安徽金峰新能源股份有限公司 | Power energy storage module for under-voltage protection of 500kW and 630kW photovoltaic inverter |
| CN104198853A (en) * | 2014-08-27 | 2014-12-10 | 江苏科技大学 | Wind power grid integration testing device and testing method |
| CN105071668A (en) * | 2015-07-30 | 2015-11-18 | 苏州景新电气有限公司 | Special-purpose power supply module for power supply of photovoltaic inverter |
| CN105071668B (en) * | 2015-07-30 | 2019-01-01 | 北京景新电气技术开发有限责任公司 | A kind of photovoltaic DC-to-AC converter power supply power source special module |
| CN108347161A (en) * | 2017-01-25 | 2018-07-31 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter soft starting circuit and frequency converter comprising it |
| CN108347161B (en) * | 2017-01-25 | 2021-11-23 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter soft start circuit and frequency converter comprising same |
| CN107219427A (en) * | 2017-06-27 | 2017-09-29 | 天津市滨海新区军民融合创新研究院 | Power supply circuit and electromagnetic compatibility test system |
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