CN101982934B - Soft starting device and method of high-power switching power supply - Google Patents
Soft starting device and method of high-power switching power supply Download PDFInfo
- Publication number
- CN101982934B CN101982934B CN 201010529928 CN201010529928A CN101982934B CN 101982934 B CN101982934 B CN 101982934B CN 201010529928 CN201010529928 CN 201010529928 CN 201010529928 A CN201010529928 A CN 201010529928A CN 101982934 B CN101982934 B CN 101982934B
- Authority
- CN
- China
- Prior art keywords
- diode
- circuit
- resistance
- electric capacity
- triode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention provides a soft starting device of a high-power switching power supply, comprising a soft starting charging circuit, a three-phase bridge rectified thyristor series circuit, a filter capacitor voltage detection circuit, a current detection and changeover decision circuit, a pulse power supply charging circuit, a pulse generating circuit and a filter capacitor, wherein the soft starting charging circuit is connected with the three-phase bridge rectified thyristor series circuit in parallel; the filter capacitor voltage detection circuit is connected with the pulse power supply charging circuit and the three-phase bridge rectified thyristor series circuit; the current detection and changeover decision circuit is connected with the pulse power supply charging circuit, the pulse generating circuit and the soft starting charging circuit; the pulse power supply charging circuit is connected with the pulse generating circuit; the pulse generating circuit is connected with the three-phase bridge rectified thyristor series circuit and the soft starting charging circuit; and the filter capacitor is connected with the circuits respectively. The invention also provides a soft starting method implemented by the device. The invention can strictly ensure the order of the core in the soft starting process.
Description
Technical field
The invention belongs to the power initiation technical field, particularly a kind of soft starting device of high power switching power supply and method.
Background technology
In the input stage circuit of high power switching power supply, the filter capacitor in parallel with rectification circuit is that jumbo electrochemical capacitor and the voltage that comes out by the rectifier bridge rectification are also than higher.At powered on moment, the filter capacitor both end voltage is zero, if the voltage that rectification this moment is come out directly is added to the filter capacitor two ends without current-limiting resistance, will produce very big impulse current, the as easy as rolling off a log damage that causes components and parts.Therefore, we must design a kind of device, make slowly to rise in the moment electric capacity both end voltage that powers on, and occur to avoid above-mentioned fault, our said soft start problem that Here it is.
Soft-start method commonly used has following four kinds of schemes:
(1) serial connection thermistor
As shown in Figure 1, this soft starting circuit comprises rectifier bridge and thermistor 7, electric capacity 8, gated transistor 9, gated transistor 10, gated transistor 11, gated transistor 12 and the transformer 13 that is made of diode 1, diode 2, diode 3, diode 4, diode 5, diode 6, three phase lines 99,100,101 of rectification bridge joint AC power; Thermistor 7 is the thermistor of negative temperature coefficient.Have the thermistor 7 of negative temperature coefficient feature, room temperature resistance is big, and the resistance of thermistor 7 sharply descended after energising heated up.Utilize thermistor 7 these specific characters, can reduce the impulse current of powered on moment, the power consumption when reducing the power supply operate as normal simultaneously.The shortcoming of this scheme is that along with the increase of input current, the power consumption on the thermistor 7 also increases, thereby makes the efficient of input stage circuit reduce, and then is restricting the overall efficiency of whole Switching Power Supply.And in high power switching power supply, input current is bigger.Therefore, this soft start scheme is not suitable for high power switching power supply.
(2) current-limiting resistance, contactor switch
As shown in Figure 2, this soft starting circuit comprises the rectifier bridge that is made of diode 14, diode 15, diode 16, diode 17, diode 18, diode 19 and current-limiting resistance 20, contacts of contactor 21, contactor coil 22, relay contact 23, relay coil 24, electric capacity 25, gated transistor 26, gated transistor 27, gated transistor 28, gated transistor 29, transformer 30, three phase lines 99,100,101 of rectification bridge joint AC power; Powered on moment, the coil 22 not conductings of contactor, the contact 21 of contactor is in off-state, rectification circuit is by 25 chargings of 20 pairs of electric capacity of current-limiting resistance, when being charged to the predeterminated voltage value Deng electric capacity 25 voltages, coil 24 conductings of relay, contact 23 closures of relay, make coil 22 conductings of contactor, contact 21 closures of contactor with current-limiting resistance 20 short circuits, make when the power supply operate as normal, current-limiting resistance 20 does not produce power consumption, has overcome the shortcoming of scheme (1).The shortcoming of this scheme is that the current-carrying part of contactor is armature contact, is not suitable for by big electric current; The operation voltage of relay can be shaken and vibrate, and causes work unreliable.
(3) thyristor three phase full bridge half control rectification
As shown in Figure 3, this circuit comprises half control rectifier bridge and filter capacitor 37, gated transistor 38, gated transistor 39, gated transistor 40, gated transistor 41 and the transformer 42 that is made of diode 34, diode 35, diode 36, thyristor 31, thyristor 32, thyristor 33, three phase lines 99,100,101 of rectification bridge joint AC power; During electrifying startup, the angle of flow of control thyristor 31, thyristor 32, thyristor 33 makes that the voltage on the filter capacitor 37 slowly rises by the rule of setting, and realizes soft start.The shortcoming of this scheme is that thyristor half control rectifier bridge price is expensive, and cost is higher, and need control the angle of flow, does not allow triggerless, and the circuits for triggering design is complicated.
(4) current-limiting resistance, thyristor switch
As shown in Figure 4, this circuit comprises rectifier bridge and thyristor 49, current-limiting resistance 50, filter capacitor 51, gated transistor 52, gated transistor 53, gated transistor 54, gated transistor 55 and the transformer 56 that is made of diode 43, diode 44, diode 45, diode 46, diode 47, diode 48, three phase lines 99,100,101 of rectification bridge joint AC power; During electrifying startup, rectification circuit to filter capacitor 51 chargings, when waiting filter capacitor 51 voltages to be charged to desired value, triggers thyristor 49 by current-limiting resistance 50.The shortcoming of this scheme is not allow triggerless.
Summary of the invention
The shortcoming that the objective of the invention is to overcome above-mentioned prior art provides a kind of simple and reasonable for structure with not enough, can guarantee reliably that filter capacitor voltage is raised to the soft starting device of the high power switching power supply of expecting that voltage afterpulse generation circuit is worked again earlier.
The present invention adopts following technical scheme:
The soft starting device of high power switching power supply, comprise soft start charging circuit, three-phase bridge rectification series thyristor circuit, filter capacitor voltage detecting circuit, current detecting switch decision circuit, pulse power charging circuit, pulse generating circuit and filter capacitor, soft start charging circuit and three-phase bridge rectification series thyristor circuit are connected in parallel; The filter capacitor voltage detecting circuit is connected with pulse power charging circuit, three-phase bridge rectification series thyristor circuit; Current detecting switch decision circuit is connected with pulse power charging circuit, pulse generating circuit, soft start charging circuit respectively; Described pulse power charging circuit is connected with pulse generating circuit; Pulse generating circuit is connected with three-phase bridge rectification series thyristor circuit, soft start charging circuit respectively; Described soft start charging circuit, three-phase bridge rectification series thyristor circuit, filter capacitor voltage detecting circuit, current detecting switch decision circuit, pulse power charging circuit, pulse generating circuit all are connected with filter capacitor; Described soft start charging circuit, pulse power charging circuit, three-phase bridge rectification series thyristor circuit be external three-phase alternating-current supply respectively.
Described three-phase bridge rectification series thyristor circuit comprises the 8th diode, the 9th diode, the tenth diode, the 11 diode, the 12 diode, the 13 diode and thyristor, and described the 8th diode, the 9th diode, the tenth diode, the 11 diode, the 12 diode and the 13 diode are power diode; The 8th diode is connected with the 11 diode, and the 9th diode is connected with the 12 diode, and the tenth diode is connected with the 13 diode; The negative electrode of the negative electrode of the negative electrode of the 8th diode, the 9th diode and the tenth diode interconnects, and all is connected with the anode of thyristor; The anode of the 11 diode, the anode of the 12 diode and the anode of the 13 diode interconnect, and all are connected with the negative pole of filter capacitor; The negative electrode of thyristor is connected with the positive pole of filter capacitor, and its gate pole is connected with pulse generating circuit; Respectively by drawing lead external on three phase lines of three-phase alternating-current supply, and the negative electrode of the 11 diode, the negative electrode of the 12 diode, the negative electrode of the 13 diode are connected with the soft start charging circuit respectively between the anode of described the 8th diode and the negative electrode of the 11 diode, between the negative electrode of the anode of the 9th diode and the 12 diode, between the negative electrode of the anode of the tenth diode and the 13 diode.
Described soft start charging circuit comprises the 4th diode, the 6th diode, the 7th diode, the 13 resistance and the 14 resistance, and described the 4th diode, the 6th diode and the 7th diode are rectifier diode; The 13 resistance is connected with the 14 resistance, the other end of the 13 resistance is connected with the negative electrode of the 4th diode, the negative electrode of the 6th diode, the negative electrode of the 7th diode respectively, and the other end of the 14 resistance is connected with current detecting switch decision circuit, the positive pole of filter capacitor, pulse generating circuit respectively; The anode of the anode of the anode of the 4th diode, the 6th diode, the 7th diode is connected with three phase lines of three-phase alternating-current supply respectively, and is connected with the negative electrode, the negative electrode of the 12 diode, the negative electrode of the 13 diode of the 11 diode in the three-phase bridge rectification series thyristor circuit respectively.
Described current detecting switch decision circuit comprises the 5th diode, the 3rd diode, the 4th resistance, the 6th electric capacity, the 9th resistance, the 11 resistance and the 4th triode, and described the 6th electric capacity is electrochemical capacitor; The anode of the 5th diode is connected between the 13 resistance and the 14 resistance in the soft start charging circuit, and the negative electrode of the 5th diode is connected with the anode of the 3rd diode, the positive pole of the 6th electric capacity respectively; The anode of the 3rd diode is connected with the positive pole of the 6th electric capacity, and its negative electrode is connected with an end, the pulse power charging circuit of the 4th resistance respectively; The other end of the 4th resistance is connected with negative pole, the pulse power charging circuit of the 6th electric capacity; One end of described the 9th resistance is connected with the anode of the negative electrode of the 5th diode, the 3rd diode, the positive pole of the 6th electric capacity, and its other end is connected with the base stage of the 11 resistance, the 4th triode; One end of the 11 resistance is connected with the base stage of the 4th triode, and the other end is connected with the negative pole of the 6th electric capacity; The emitter of the 4th triode is connected with the negative pole of the 6th electric capacity, and its collector electrode is connected with pulse generating circuit, and the negative pole of the 6th electric capacity is connected with the positive pole of filter capacitor, the 14 resistance in the soft start charging circuit respectively.
Described pulse power charging circuit comprises transformer, first diode, first triode, second resistance, second diode and first electric capacity, described first electric capacity is electrochemical capacitor, the elementary two ends of transformer are connected with a phase line with the zero line of three-phase alternating-current supply respectively, its secondary end is connected with the collector electrode of the 3rd triode in the filter capacitor voltage detecting circuit, its secondary other end is connected with the anode of first diode, the negative electrode of first diode is connected with the emitter of first triode, the base stage of first triode is connected with the anode of second diode, and the negative electrode of second diode is connected with current detecting switch decision circuit; The collector electrode of first triode is connected with positive pole, the pulse generating circuit of first electric capacity; The negative pole of first electric capacity is connected with the positive pole of current detecting switch decision circuit, filter capacitor; Described second resistance, one end is connected between the emitter of the negative electrode of first diode and first triode, and the other end is connected between the anode of the base stage of first triode and second diode.
Described pulse generating circuit comprises first resistance, second triode, unijunction transistor, the 12 resistance, the 3rd resistance, second electric capacity, the tenth resistance, the 5th electric capacity, the 4th electric capacity and the 8th resistance, one end of first resistance is connected with pulse power charging circuit respectively, and the other end is connected with the emitter of second triode; The collector electrode of second triode is connected with the gate pole of unijunction transistor, and the base stage of second triode is connected with the anode of unijunction transistor; The negative electrode of unijunction transistor is connected with an end of the 12 resistance, and the gate pole of the thyristor in the other end of the 12 resistance and the three-phase bridge rectification series thyristor circuit is connected; One end of the 3rd resistance is connected with the emitter of first resistance, second triode respectively, and the other end is connected with base stage, the anode of unijunction transistor, the current detecting switch decision circuit of second triode respectively; One end of second electric capacity is connected with the anode of unijunction transistor, and the negative pole of the 6th electric capacity, the positive pole of filter capacitor are connected in the other end and the current detecting switch decision circuit; One end of the tenth resistance and the 5th electric capacity all is connected with the negative electrode of unijunction transistor, and the other end all is connected with the negative pole, the positive pole of filter capacitor of the 6th electric capacity in the current detecting switch decision circuit; The 4th electric capacity is in parallel with the 8th resistance, and the one end all is connected with the gate pole of unijunction transistor, the collector electrode of second triode, and the other end all is connected with the negative pole, the positive pole of filter capacitor of the 6th electric capacity in the current detecting switch decision circuit; Described the tenth resistance, the 5th electric capacity, the 4th electric capacity and the 8th resistance all are connected with the soft start charging circuit.
One end of described first resistance is connected with the positive pole, the collector electrode of first triode of first electric capacity in the pulse power charging circuit respectively, and the other end is connected with the emitter of second triode; One end of described the 3rd resistance is connected with the emitter of first resistance, second triode respectively, and the other end is connected with the collector electrode of the 4th triode in the anode of the base stage of second triode, unijunction transistor, the current detecting switch decision circuit respectively.
Described filter capacitor voltage detecting circuit comprises the 6th resistance, the 7th resistance and the 5th resistance of the 3rd triode, the 3rd electric capacity and series connection successively, and described the 3rd electric capacity is electrochemical capacitor; The other end of the 5th resistance is connected with the positive pole of the positive pole of filter capacitor, the 3rd electric capacity, the emitter of the 3rd triode, and the other end of the 6th resistance is connected with the negative pole of filter capacitor, three-phase bridge rectification series thyristor circuit; The negative pole of the 3rd electric capacity is connected between the 7th resistance and the 5th resistance and with the base stage of the 3rd triode and is connected; The base stage of the 3rd triode is connected between the 7th resistance and the 5th resistance, and the collector electrode of the 3rd triode is connected with an end of transformer secondary output in the pulse power charging circuit.
The soft-start method of the high power switching power supply of being realized by said apparatus comprises the steps:
(1) high power switching power supply powers on by inserting three-phase alternating current;
(2) the soft start charging circuit charges to filter capacitor;
(3) current detecting switch decision circuit detects the electric current of soft start charging circuit, simultaneously, the filter capacitor voltage detecting circuit detects the voltage at filter capacitor two ends, if the electric current of soft start charging circuit and the voltage at filter capacitor two ends all satisfy condition simultaneously, then pulse power charging circuit work;
(4) on the basis of step (3), current detecting switch decision circuit detects the electric current of soft start charging circuit, if the electric current of soft start charging circuit is little of making the 4th triode in the current detecting switch decision circuit end then pulse generating circuit work;
(5) pulse generating circuit produces pulse, triggers the thyristor in the three-phase bridge rectification series thyristor circuit, switches to three-phase bridge rectification series thyristor circuit filter capacitor is charged, and finishes the soft start of high power switching power supply.
The soft start charging circuit comprises the concrete steps that filter capacitor charges in the described step (2): the electric current on three phase lines of three-phase alternating current constitutes three-phase bridge rectification circuit output via the 11 diode in the 4th diode in the soft start charging circuit, the 6th diode, the 7th diode and the three-phase bridge rectification series thyristor circuit, the 12 diode, the 13 diode respectively, charges to filter capacitor by the 13 resistance, the 14 resistance successively again;
In the described step (3), when the electric current of soft start charging circuit less than the voltage at set point and filter capacitor two ends during greater than set point, the then first triode conducting in the pulse power charging circuit is so that the work of pulse power charging circuit; Three-phase alternating current provides electric current by its zero line and phase line to transformer, and electric current through first diode, first triode, second resistance, second diode and first electric capacity, carries out energy storage by first electric capacity respectively, is the pulse generating circuit power supply;
In the described step (5), the concrete steps that pulse generating circuit triggers the thyristor in the three-phase bridge rectification series thyristor circuit comprise: the voltage on the 6th electric capacity in the current detecting switch decision circuit with the filter capacitor charging current constantly reduce and when dropping to set point, the 4th triode is become by conducting and ends, pulse generating circuit is via first resistance, the 3rd resistance and second triode are given the charging of the 4th electric capacity, when the voltage on second electric capacity rises near the voltage on first electric capacity in the pulse power charging circuit, second triode ends, make the 4th electric capacity through the 8th conductive discharge, unijunction transistor is triggered when the voltage on the 4th electric capacity drops to certain value, forms a pulse voltage and the thyristor in the 12 resistance triggering three-phase bridge rectification series thyristor circuit at the tenth resistance and the 5th electric capacity; After thyristor is triggered, the three-phase bridge rectification circuit that is made of the 8th diode, the 9th diode, the tenth diode and the 11 diode, the 12 diode, the 13 diode charges to filter capacitor via thyristor, thereby finishes the soft start charging circuit to the switching of three-phase bridge rectification series thyristor circuit.
Principle of the present invention: when high power switching power supply powers on, the soft start charging circuit charges to big capacity filter capacitor, this moment, the filter capacitor both end voltage was lower, the magnitude of voltage that is not higher than setting, and charging current is bigger at this moment, also not less than the current value of setting, pulse power charging circuit can not enter running status.Continuous increase along with the filter capacitor both end voltage, the magnitude of voltage that is higher than setting when the voltage of filter capacitor, but soft start charging current this moment (electric current of soft start charging circuit) still is higher than set point, and pulse power charging circuit still can not enter running status.Continuous minimizing along with the soft start charging current, when charging current is lower than set point, show that namely the difference of Output Voltage in Rectified Circuits and filter capacitor both end voltage is less than set point, this moment, pulse power charging circuit put into operation, when charging current further is reduced to another set point, pulse generating circuit puts into operation, this moment, the charging circuit of filter capacitor switched to three-phase bridge rectification series thyristor circuit by the soft start charging circuit, thereby had realized the switching of charging circuit under the filter capacitor voltage of expectation.Current detecting switch decision circuit and filter capacitor voltage detecting circuit for the control of pulse power charging circuit be " with " logic, when namely having only two circuit to reach the target of setting, pulse power charging circuit just can put into operation.
The 5th resistance, the 6th resistance and the 7th resistance carry out dividing potential drop to the filter capacitor both end voltage, and when the voltage of getting when the 5th resistance reached the conducting voltage of the 3rd triode emitter junction, the transformer secondary output of pulse power charging circuit could output current.We can be by suitably choosing the resistance of the 5th resistance, the 5th resistance and these three resistance of the 7th resistance like this, control the just conducting when the filter capacitor both end voltage reaches the value of expectation of the 3rd triode, the 3rd electric capacity strobes, and prevents that High-frequency Interference voltage from causing the 3rd triode conducting.
The 13 resistance, the 14 resistance had both served as the current-limiting resistance of soft start charging circuit, the negative task of detecting charging current of holding concurrently again simultaneously.The voltage that falls at the 14 resistance two ends charges by the 5th diode pair the 6th electric capacity, makes the voltage at the 6th electric capacity two ends equate with the 14 ohmically pressure drop substantially.When the soft start charging current is big, fall at the 13 resistance, the 14 ohmically voltage higher, voltage on the 6th electric capacity is also higher, transformer is a step-down transformer, the secondary voltage effective value is 9 volts, through about 12 volts of the crest voltage of first diode output, therefore, when the voltage on the 6th electric capacity is higher than 12 volts, second diode always is in cut-off state, and making the triode of winning is zero because of base current, and is in cut-off state, thereby can not be to first electric capacity charging, thereby make with first electric capacity to be that the pulse generating circuit of power supply can not be worked.Be higher than in the filter capacitor both end voltage under the situation of magnitude of voltage of setting, when the soft start charging current is little when making voltage on the 6th electric capacity be lower than 12 volts, second diode begins conducting, makes the triode conducting of winning, first electric capacity is charged i.e. pulse power charging circuit work.The 9th resistance, the 11 resistance are to the 6th capacitance partial pressure, suitably select the resistance of the 9th resistance, the 11 resistance, the 4th triode saturation conduction when making voltage on the 6th electric capacity greater than certain suitable value causes second electric capacity not to be recharged, and pulse generating circuit is not worked.When the voltage at the 6th electric capacity two ends during less than certain threshold value the 4th triode end, pulse generating circuit is devoted oneself to work.
Pulse generating circuit is to be the relaxation oscillating circuit of core with the unijunction transistor.When powering on, first electric capacity in the voltage ratio pulse power charging circuit on second electric capacity forces down when surpassing the emitter junction conducting voltage of second triode, first electric capacity is by first resistance, the emitter junction of the 3rd resistance and second triode is given the charging of second electric capacity, also give the charging of the 4th electric capacity by the collector electrode of second triode simultaneously, select the resistance of the 8th resistance enough big, thereby the 4th capacitance discharges speed that guarantees is than slow many of charging rate, therefore the voltage on the 4th electric capacity can be charged to the degree of only hanging down a saturation voltage drop than the second transistor emitter voltage very soon, and as long as second triode is conducting, voltage on second electric capacity just hangs down an emitter junction conducting voltage than the emitter voltage of second triode, as seen during the triode conducting, voltage on the 4th electric capacity will be higher than the voltage on second electric capacity, unijunction transistor is in cut-off state, when the voltage on second electric capacity rises to the 3rd ohmically pressure drop less than the conducting voltage of the second triode emitter junction, second triode ends, second electric capacity continues by the charging of the 3rd resistance, and the 4th electric capacity is by the 8th conductive discharge, voltage on voltage ratio second electric capacity on the 4th electric capacity is low to triggering unijunction transistor, when unijunction transistor is triggered and during conducting, second electric capacity and the 4th electric capacity are all by the unijunction transistor repid discharge, and produce a pulse current by the 12 resistance and trigger thyristor, when unijunction transistor recovers cut-off state, had only very low residual voltage on second electric capacity and the 4th electric capacity, therefore begin charging again, it is the pulse production process that pulse generating circuit begins following one-period, the tenth resistance and the 5th electric capacity strobe, and prevent High-frequency Interference voltage false triggering thyristor.
When high power switching power supply powered on, filter capacitor voltage was zero, the 3rd not conducting of triode, this moment, the soft start charging current was bigger, the first also not conducting of triode, and the 4th triode saturation conduction, so pulse power charging circuit and pulse generating circuit are not worked.Along with filter capacitor voltage constantly increases, be higher than voltage setting value, the 3rd triode conducting.And on the other hand, the soft start charging current constantly reduces, and less than current setting value, namely the difference of Output Voltage in Rectified Circuits and filter capacitor both end voltage arrives set point.At this moment, the pulse power charging circuit state that puts into operation, begin first electric capacity is charged, voltage at the first electric capacity two ends rises to suitable value, and the soft start charging current further reduces to make the voltage on the 6th electric capacity to be down to the 4th triode to end, pulse generating circuit puts into operation, and circuit switches to the three-phase bridge rectification charged state by the soft start charged state.The dual fail-safe of current detecting and switch decision circuit and filter capacitor voltage detecting circuit forming circuit safety, in case one of them circuit can not be worked because of a variety of causes, another circuit works independently and also can make Switching Power Supply avoid very big impact.
Compared with prior art, the present invention has following advantage and beneficial effect:
(1) the present invention's interconnecting dexterously by each circuit such as design filter capacitor voltage detecting circuit, current detecting switch decision circuit and soft starting circuits, guaranteed that circuit is under situation about disturbing, still can under suitable filter capacitor voltage, switch to three-phase bridge rectification series thyristor circuit from the soft start charging circuit filter capacitor is charged.
(2) device of the present invention is simple, and cost is low.
Description of drawings
Fig. 1 is a kind of structural representation of prior art.
Fig. 2 is second kind of structural representation of prior art.
Fig. 3 is the third structural representation of prior art.
Fig. 4 is the 4th kind of structural representation of prior art.
Fig. 5 is the structural representation of apparatus of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 5, the soft starting device of this high power switching power supply comprises soft start charging circuit, three-phase bridge rectification series thyristor circuit, filter capacitor voltage detecting circuit, current detecting switch decision circuit, pulse power charging circuit, pulse generating circuit and filter capacitor 97, and soft start charging circuit and three-phase bridge rectification series thyristor circuit are connected in parallel; The filter capacitor voltage detecting circuit is connected with pulse power charging circuit, three-phase bridge rectification series thyristor circuit; Current detecting switch decision circuit is connected with pulse power charging circuit, pulse generating circuit, soft start charging circuit respectively; Described pulse power charging circuit is connected with pulse generating circuit; Pulse generating circuit is connected with three-phase bridge rectification series thyristor circuit, soft start charging circuit respectively; Described soft start charging circuit, three-phase bridge rectification series thyristor circuit, filter capacitor voltage detecting circuit, current detecting switch decision circuit, pulse power charging circuit, pulse generating circuit all are connected with filter capacitor 97; Described soft start charging circuit, pulse power charging circuit, three-phase bridge rectification series thyristor circuit be external three-phase alternating-current supply respectively.
Described three-phase bridge rectification series thyristor circuit comprises the 8th diode 90, the 9th diode 91, the tenth diode 92, the 11 diode 93, the 12 diode 94, the 13 diode 95 and thyristor 96, and described the 8th diode 90, the 9th diode 91, the tenth diode 92, the 11 diode 93, the 12 diode 94 and the 13 diode 95 are power diode; The 8th diode 90 is connected with the 11 diode 93, and the 9th diode 91 is connected with the 12 diode 94, and the tenth diode 92 is connected with the 13 diode 95; The negative electrode of the negative electrode of the negative electrode of the 8th diode 90, the 9th diode 91 and the tenth diode 92 interconnects, and all is connected with the anode of thyristor 96; The anode of the 11 diode 93, the anode of the 12 diode 94 and the anode of the 13 diode 95 interconnect, and all are connected with the negative pole of filter capacitor 97; The negative electrode of thyristor 96 is connected with the positive pole of filter capacitor 97, and its gate pole is connected with the 12 resistance 84 in the pulse generating circuit; Respectively by drawing lead external on three phase lines 99,100,101 of three-phase alternating-current supply, and the negative electrode of the 11 diode 93, the negative electrode of the 12 diode 94, the negative electrode of the 13 diode 95 are connected with the soft start charging circuit respectively between the anode of described the 8th diode 90 and the negative electrode of the 11 diode 93, between the negative electrode of the anode of the 9th diode 91 and the 12 diode 94, between the negative electrode of the anode of the tenth diode 92 and the 13 diode 95.
Described soft start charging circuit comprises the 4th diode 85, the 6th diode 86, the 7th diode 87, the 13 resistance 88 and the 14 resistance 89, and described the 4th diode 85, the 6th diode 86 and the 7th diode 87 are rectifier diode; The 13 resistance 88 is connected with the 14 resistance 89, the other end of the 13 resistance 88 is connected with the negative electrode of the 4th diode 85, the negative electrode of the 6th diode 86, the negative electrode of the 7th diode 87 respectively, and the other end of the 14 resistance 89 is connected with the negative pole, the positive pole of filter capacitor 97, the tenth resistance 80, the 5th electric capacity 81, the 4th electric capacity 82 and the 8th resistance 83 in the pulse generating circuit of the 6th electric capacity 70 in the current detecting switch decision circuit respectively; The anode of the anode of the anode of the 4th diode 85, the 6th diode 86, the 7th diode 87 is connected with three phase lines 99,100,101 of three-phase alternating-current supply respectively, and is connected with the negative electrode, the negative electrode of the 12 diode 94, the negative electrode of the 13 diode 95 of the 11 diode 93 in the three-phase bridge rectification series thyristor circuit respectively.
Described current detecting switch decision circuit comprises the 5th diode 69, the 3rd diode 71, the 4th resistance 67, the 6th electric capacity 70, the 9th resistance 72, the 11 resistance 73 and the 4th triode 74, and described the 6th electric capacity 70 is electrochemical capacitor; The anode of the 5th diode 69 is connected between the 13 resistance 88 and the 14 resistance 89 in the soft start charging circuit, and the negative electrode of the 5th diode 69 is connected with the anode of the 3rd diode 71, the positive pole of the 6th electric capacity 70 respectively; The anode of the 3rd diode 71 is connected with the positive pole of the 6th electric capacity 70, and its negative electrode is connected with the negative electrode of second diode 66 in an end of the 4th resistance 67, the pulse power charging circuit respectively; The negative pole of the other end of the 4th resistance 67 and the negative pole of the 6th electric capacity 70, first electric capacity 68 in the pulse power charging circuit is connected; One end of described the 9th resistance 72 is connected with the anode of the negative electrode of the 5th diode 69, the 3rd diode 71, the positive pole of the 6th electric capacity 70, and its other end is connected with the base stage of the 11 resistance 73, the 4th triode 74; One end of the 11 resistance 73 is connected with the base stage of the 4th triode 74, and the other end is connected with the negative pole of the 6th electric capacity 70; The emitter of the 4th triode 74 is connected with the negative pole of the 6th electric capacity 70, the anode of the unijunction transistor 79 in its collector electrode and the pulse generating circuit is connected, and the negative pole of the 6th electric capacity 70 is connected with the positive pole of filter capacitor 97, the 14 resistance 89 in the soft start charging circuit respectively.
Described pulse power charging circuit comprises transformer 62, first diode 63, first triode 64, second resistance 65, second diode 66 and first electric capacity 68, described first electric capacity 68 is electrochemical capacitor, the elementary two ends of transformer 62 are connected with a phase line 99 with the zero line 98 of three-phase alternating-current supply respectively, its secondary end is connected with the collector electrode of the 3rd triode 61 in the filter capacitor voltage detecting circuit, its secondary other end is connected with the anode of first diode 63, the negative electrode of first diode 63 is connected with the emitter of first triode 64, the base stage of first triode 64 is connected with the anode of second diode 66, an end of the 4th resistance 67 in the negative electrode of second diode 66 and the current detecting switch decision circuit, the negative electrode of the 3rd diode 71 connects; The collector electrode of first triode 64 and the positive pole of first electric capacity 68, first resistance, 75 1 ends in the pulse generating circuit are connected; The negative pole of the 6th electric capacity 70, the positive pole of filter capacitor 97 are connected in the negative pole of first electric capacity 68 and the current detecting switch decision circuit; Described second resistance, 65 1 ends are connected between the emitter of the negative electrode of first diode 63 and first triode 64, and the other end is connected between the anode of the base stage of first triode 64 and second diode 66.
Described pulse generating circuit comprises first resistance 75, second triode 77, unijunction transistor 79, the 12 resistance 84, the 3rd resistance 76, second electric capacity 78, the tenth resistance 80, the 5th electric capacity 81, the 4th electric capacity 82 and the 8th resistance 83, one end of first resistance 75 is connected with the positive pole of first electric capacity 68 of pulse power charging circuit respectively, and the other end is connected with the emitter of second triode 77; The collector electrode of second triode 77 is connected with the gate pole of unijunction transistor 79, and the base stage of second triode 77 is connected with the anode of unijunction transistor 79; The negative electrode of unijunction transistor 79 is connected with an end of the 12 resistance 84, and the other end of the 12 resistance 84 is connected with the gate pole of thyristor 96 in the three-phase bridge rectification series thyristor circuit; One end of the 3rd resistance 76 is connected with the emitter of first resistance 75, second triode 77 respectively, and the other end is connected with the base stage of second triode 77, the anode of unijunction transistor 79, the 4th triode 74 collector electrodes of current detecting switch decision circuit respectively; One end of second electric capacity 78 is connected with the anode of unijunction transistor 79, and the negative pole of the 6th electric capacity 70, the positive pole of filter capacitor 97 are connected in the other end and the current detecting switch decision circuit; One end of the tenth resistance 80 and the 5th electric capacity 81 all is connected with the negative electrode of unijunction transistor 79, and the other end all is connected with the negative pole, the positive pole of filter capacitor 97 of the 6th electric capacity 70 in the current detecting switch decision circuit; The 4th electric capacity 82 is in parallel with the 8th resistance 83, and the one end all is connected with the gate pole of unijunction transistor 79, the collector electrode of second triode 77, and the other end all is connected with the negative pole, the positive pole of filter capacitor 97 of the 6th electric capacity 70 in the current detecting switch decision circuit; Described the tenth resistance 80, the 5th electric capacity 81, the 4th electric capacity 82 and the 8th resistance 83 all are connected with the 14 resistance 89 in the soft start charging circuit.
One end of described first resistance 75 is connected with the positive pole, the collector electrode of first triode 64 of first electric capacity 68 in the pulse power charging circuit respectively, and the other end is connected with the emitter of second triode 77;
One end of described the 3rd resistance 76 is connected with the emitter of first resistance 75, second triode 77 respectively, and the other end is connected with the collector electrode of the 4th triode 74 in the anode of the base stage of second triode 77, unijunction transistor 79, the current detecting switch decision circuit respectively.
Described filter capacitor voltage detecting circuit comprises the 6th resistance 57, the 7th resistance 58 and the 5th resistance 60 of the 3rd triode 61, the 3rd electric capacity 59 and series connection successively, and described the 3rd electric capacity 59 is electrochemical capacitor; The other end of the 5th resistance 60 is connected with the positive pole of filter capacitor 97, the positive pole of the 3rd electric capacity 59, the emitter of the 3rd triode 61, and the other end of the 6th resistance 57 is connected with the negative pole of filter capacitor 97; The negative pole of the 3rd electric capacity 59 is connected between the 7th resistance 58 and the 5th resistance 60 and with the base stage of the 3rd triode 61 and is connected; The base stage of the 3rd triode 61 is connected between the 7th resistance 58 and the 5th resistance 60, and the collector electrode of the 3rd triode 61 is connected with a secondary end of the transformer 62 of pulse power charging circuit.
When the soft start charging circuit powers on for high power switching power supply, to big capacity filter capacitor 97 chargings; When three-phase bridge rectification series thyristor circuit is used for the high power switching power supply operate as normal, to big capacity filter capacitor 97 chargings; Current detecting switch decision circuit is for detection of the soft start charging current, and judge whether to allow pulse power charging circuit and pulse generating circuit put into operation, the condition that pulse power charging circuit and pulse generating circuit put into operation is that the voltage on the filter capacitor 97 is higher than set point, and the soft start charging current is less than set point, what it is pointed out that the final reflection of charging current is the difference of Output Voltage in Rectified Circuits and filter capacitor 97 both end voltage; The filter capacitor voltage detecting circuit is that filter capacitor 97 both end voltage are detected, and judging whether to allow pulse power charging circuit put into operation, the condition that pulse power charging circuit puts into operation is that filter capacitor 97 both end voltage are greater than set point and soft start charging current less than set point; Pulse power charging circuit is to press for pulse generating circuit provides a comparatively stable direct current; Pulse generating circuit produces the higher pulse that can allow thyristor trigger of frequency.
The soft-start method of the high power switching power supply of being realized by said apparatus comprises the steps:
(1) high power switching power supply powers on by inserting three-phase alternating current;
(2) the soft start charging circuit charges to filter capacitor 97;
(3) current detecting switch decision circuit detects the electric current of soft start charging circuit, simultaneously, the filter capacitor voltage detecting circuit detects the voltage at filter capacitor 97 two ends, if the electric current of soft start charging circuit and the voltage at filter capacitor 97 two ends all satisfy condition simultaneously, then pulse power charging circuit work;
(4) on the basis of step (3), current detecting switch decision circuit detects the electric current of soft start charging circuit, if the electric current of soft start charging circuit is little of making the 4th triode 74 in the current detecting switch decision circuit end then pulse generating circuit work;
(5) pulse generating circuit produces pulse, triggers the thyristor in the three-phase bridge rectification series thyristor circuit, switches to three-phase bridge rectification series thyristor circuit filter capacitor 97 is charged, and finishes the soft start of high power switching power supply.
The soft start charging circuit comprises the concrete steps that filter capacitor charges in the described step (2): the electric current on three phase lines of three-phase alternating current is exported with the 11 diode 93, the 12 diode 94, the 13 diode 95 formation three-phase bridge rectification circuits in the three-phase bridge rectification series thyristor circuit via the 4th diode 85 in the soft start charging circuit, the 6th diode 86, the 7th diode 87 respectively, gives filter capacitor 97 chargings by the 13 resistance 88, the 14 resistance 89 successively again;
In the described step (3), when the electric current of soft start charging circuit less than the voltage at set point and filter capacitor 97 two ends during greater than set point, then first triode, 64 conductings in the pulse power charging circuit are so that the work of pulse power charging circuit; Three-phase alternating current provides electric current by its zero line and phase line to transformer, electric current is respectively through first diode 63, first triode 64, second resistance 65, second diode 66 and first electric capacity 68, carry out energy storage by first electric capacity 68, be the pulse generating circuit power supply;
In the described step (5), the concrete steps that pulse generating circuit triggers the thyristor in the three-phase bridge rectification series thyristor circuit comprise: the voltage on the 6th electric capacity 70 in the current detecting switch decision circuit with the filter capacitor charging current constantly reduce and when dropping to set point, the 4th triode 74 is become by conducting and ends, pulse generating circuit is via first resistance 75, the 3rd resistance 76 and second triode 77 give second electric capacity 78 chargings, simultaneously, pulse power charging circuit also gives the 4th electric capacity 82 chargings via first resistance 75 and second triode 77, when the voltage on second electric capacity 78 rises near the voltage on first electric capacity 68 in the pulse power charging circuit, second triode 77 ends, make the 4th electric capacity 82 through 83 discharges of the 8th resistance, unijunction transistor 79 is triggered when the voltage on the 4th electric capacity 82 drops to certain value, forms a pulse voltage and the thyristor 96 in the 12 resistance 84 triggering three-phase bridge rectification series thyristor circuit at the tenth resistance 80 and the 5th electric capacity 81; After thyristor is triggered, give filter capacitor 97 chargings by the three-phase bridge rectification circuit that the 8th diode 90, the 9th diode 91, the tenth diode 92 and the 11 diode 93, the 12 diode 94, the 13 diode 95 constitute via thyristor, thereby finish the soft start charging circuit to the switching of three-phase bridge rectification series thyristor circuit.
Principle of the present invention: when high power switching power supply powers on, the soft start charging circuit charges to big capacity filter capacitor 97, this moment, filter capacitor 97 both end voltage were lower, the magnitude of voltage that is not higher than setting, and charging current is bigger at this moment, also not less than the current value of setting, the pulse power charging circuit state that can not put into operation.Continuous increase along with filter capacitor 97 both end voltage, the magnitude of voltage that is higher than setting when the voltage of filter capacitor 97 earlier, but soft start charging current this moment (electric current of soft start charging circuit) still is higher than set point, the pulse power charging circuit state that still can not put into operation.Continuous minimizing along with the soft start charging current, when charging current is lower than set point, this moment the pulse power charging circuit state that puts into operation, when the soft start charging current is further reduced to the 4th triode 74 when ending, pulse generating circuit also puts into operation, this moment, the charging circuit of filter capacitor 97 switched to three-phase bridge rectification series thyristor circuit by the soft start charging circuit, thereby had realized the switching of charging circuit under suitable filter capacitor 97 voltages.Current detecting switch decision circuit and filter capacitor voltage detecting circuit for the control of pulse power charging circuit be " with " logic, when namely having only two circuit to reach the target of setting, pulse power charging circuit just can put into operation.
The 5th resistance 60, the 6th resistance 57 and 58 pairs of filter capacitors of the 7th resistance, 97 both end voltage dividing potential drops, when the 5th resistance 60 minutes voltage when reaching the conducting voltage of the 3rd triode 61 emitter junctions, the secondary of the transformer 62 of pulse power charging circuit could output current.We can be by suitably choosing the resistance of the 5th resistance 60, the 6th resistance 57 and the 7th resistance 58 these three resistance like this, control the 3rd triode 61 in the just conducting when getting suitable value of filter capacitor 97 both end voltage, thereby guaranteed under disturbing, when having only filter capacitor 97 both end voltage to be higher than certain suitable threshold, just might switch to three-phase bridge rectification series thyristor circuit by the soft start charging circuit.
The 13 resistance 88, the 14 resistance 89 had both served as the current-limiting resistance of soft start charging circuit, the negative task of detecting charging current of holding concurrently again simultaneously.The voltage that falls at the 14 resistance 89 two ends charges by 69 pairs of the 6th electric capacity 70 of the 5th diode, makes the voltage pressure drop basic and on the 14 resistance 89 at the 6th electric capacity 70 two ends equate.When the soft start charging current is big, fall at the 13 resistance 88, voltage on the 14 resistance 89 is higher, voltage on the 6th electric capacity 70 is also higher, transformer 62 is step-down transformers, the secondary voltage effective value is 9 volts, through about 12 volts of the crest voltage of first diode 63 output, therefore, when the voltage on the 6th electric capacity 70 is higher than 12 volts, second diode 66 always is in cut-off state, and making the triode 64 of winning is zero because of base current, and is in cut-off state, thereby can not be to the charging of first electric capacity 68, thereby make with first electric capacity 68 to be that the pulse generating circuit of power supply can not be worked.Be higher than in the filter capacitor both end voltage under the situation of magnitude of voltage of setting, when the soft start charging current is little when making voltage on the 6th electric capacity 70 be lower than 12 volts, the 66 beginning conductings of second diode make triode 64 conductings of winning, and first electric capacity 68 is charged.The 9th resistance 72,73 pairs of the 6th electric capacity of the 11 resistance, 70 dividing potential drops, suitably select the resistance of the 9th resistance 72, the 11 resistance 73, the 4th triode 74 saturation conductions when making voltage on the 6th electric capacity 70 greater than certain suitable value, cause second electric capacity 78 not to be recharged, pulse generating circuit is not worked.When the voltage at the 6th electric capacity 70 two ends during less than certain threshold value the 4th triode 74 end, pulse generating circuit is devoted oneself to work.
Pulse generating circuit is to be the relaxation oscillating circuit of core with unijunction transistor 79.When powering on, voltage ratio first electric capacity 68 on second electric capacity 78 forces down when surpassing the emitter junction conducting voltage of second triode 77, first electric capacity 68 is by first resistance 75, the emitter junction of the 3rd resistance 76 and second triode 77 gives second electric capacity 78 chargings, also give the 4th electric capacity 82 chargings by the collector electrode of second triode 77 simultaneously, select the resistance of the 8th resistance 83 enough big, thereby the velocity of discharge that guarantees the 4th electric capacity 82 is than slow many of charging rate, therefore the voltage on the 4th electric capacity 82 can be charged to the degree of only hanging down a saturation voltage drop than second triode, 77 emitter voltages very soon, and as long as second triode 77 is conductings, voltage on second electric capacity 78 just hangs down an emitter junction conducting voltage than the emitter voltage of second triode 77, as seen during the triode conducting, voltage on the 4th electric capacity 82 will be higher than the voltage on second electric capacity 78, unijunction transistor 79 is in cut-off state, when the voltage on second electric capacity 78 rises to pressure drop on the 3rd resistance 76 less than the conducting voltage of second triode, 77 emitter junctions, second triode 77 ends, second electric capacity 78 continues by 76 chargings of the 3rd resistance, and the 4th electric capacity 82 is by 83 discharges of the 8th resistance, voltage on voltage ratio second electric capacity 78 on the 4th electric capacity 82 is low to triggering unijunction transistor 79, when unijunction transistor 79 is triggered and during conducting, second electric capacity 78 and the 4th electric capacity 82 are all by unijunction transistor 79 repid discharges, and by the 12 resistance 84 generations one pulse current triggering thyristor 96, when unijunction transistor 79 recovers cut-off state, had only very low residual voltage on second electric capacity 78 and the 4th electric capacity 82, therefore begin charging again, it is the pulse production process that pulse generating circuit begins following one-period, the tenth resistance 80 and the 5th electric capacity 81 strobe, and prevent High-frequency Interference voltage false triggering thyristor 96.
When high power switching power supply powered on, filter capacitor 97 voltages were zero, the 61 not conductings of the 3rd triode, this moment, the soft start charging current was bigger, the 64 also not conductings of first triode, and the 4th triode 74 saturation conductions, so pulse power charging circuit and pulse generating circuit are not worked.Along with filter capacitor 97 voltages constantly increase, be higher than voltage setting value, 61 conductings of the 3rd triode.And on the other hand, the soft start charging current constantly reduces, and less than current setting value, namely the difference of Output Voltage in Rectified Circuits and filter capacitor 97 both end voltage arrives set point.At this moment, the pulse power charging circuit state that puts into operation, begin first electric capacity 68 is charged, voltage at first electric capacity, 68 two ends rises to suitable value, and the soft start charging current further reduces to make the voltage on the 6th electric capacity 70 to be down to the 4th triode 74 to end, pulse generating circuit puts into operation, and circuit switches to the three-phase bridge rectification charged state by the soft start charged state.The dual fail-safe of current detecting and switch decision circuit and filter capacitor voltage detecting circuit forming circuit safety, in case one of them circuit can not be worked because of a variety of causes, another circuit works independently and also can make Switching Power Supply avoid very big impact.
Above-described embodiment is preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. the soft starting device of high power switching power supply, it is characterized in that: comprise soft start charging circuit, three-phase bridge rectification series thyristor circuit, filter capacitor voltage detecting circuit, current detecting switch decision circuit, pulse power charging circuit, pulse generating circuit and filter capacitor, soft start charging circuit and three-phase bridge rectification series thyristor circuit are connected in parallel; The filter capacitor voltage detecting circuit is connected with pulse power charging circuit, three-phase bridge rectification series thyristor circuit; Current detecting switch decision circuit is connected with pulse power charging circuit, pulse generating circuit, soft start charging circuit respectively; Described pulse power charging circuit is connected with pulse generating circuit; Pulse generating circuit is connected with three-phase bridge rectification series thyristor circuit, soft start charging circuit respectively; Described soft start charging circuit, three-phase bridge rectification series thyristor circuit, filter capacitor voltage detecting circuit, current detecting switch decision circuit, pulse power charging circuit, pulse generating circuit all are connected with filter capacitor; Described soft start charging circuit, pulse power charging circuit, three-phase bridge rectification series thyristor circuit be external three-phase alternating-current supply respectively;
Described three-phase bridge rectification series thyristor circuit comprises the 8th diode, the 9th diode, the tenth diode, the 11 diode, the 12 diode, the 13 diode and thyristor, and described the 8th diode, the 9th diode, the tenth diode, the 11 diode, the 12 diode and the 13 diode are power diode; The 8th diode is connected with the 11 diode, and the 9th diode is connected with the 12 diode, and the tenth diode is connected with the 13 diode; The negative electrode of the negative electrode of the negative electrode of the 8th diode, the 9th diode and the tenth diode interconnects, and all is connected with the anode of thyristor; The anode of the 11 diode, the anode of the 12 diode and the anode of the 13 diode interconnect, and all are connected with the negative pole of filter capacitor; The negative electrode of thyristor is connected with the positive pole of filter capacitor, and its gate pole is connected with pulse generating circuit; Respectively by drawing lead external on three phase lines of three-phase alternating-current supply, and the negative electrode of the 11 diode, the negative electrode of the 12 diode, the negative electrode of the 13 diode are connected with the soft start charging circuit respectively between the anode of described the 8th diode and the negative electrode of the 11 diode, between the negative electrode of the anode of the 9th diode and the 12 diode, between the negative electrode of the anode of the tenth diode and the 13 diode;
Described soft start charging circuit comprises the 4th diode, the 6th diode, the 7th diode, the 13 resistance and the 14 resistance, and described the 4th diode, the 6th diode and the 7th diode are rectifier diode; The 13 resistance is connected with the 14 resistance, the other end of the 13 resistance is connected with the negative electrode of the 4th diode, the negative electrode of the 6th diode, the negative electrode of the 7th diode respectively, and the other end of the 14 resistance is connected with current detecting switch decision circuit, the positive pole of filter capacitor, pulse generating circuit respectively; The anode of the anode of the anode of the 4th diode, the 6th diode, the 7th diode is connected with three phase lines of three-phase alternating-current supply respectively, and is connected with the negative electrode, the negative electrode of the 12 diode, the negative electrode of the 13 diode of the 11 diode in the three-phase bridge rectification series thyristor circuit respectively;
Described current detecting switch decision circuit comprises the 5th diode, the 3rd diode, the 4th resistance, the 6th electric capacity, the 9th resistance, the 11 resistance and the 4th triode, and described the 6th electric capacity is electrochemical capacitor; The anode of the 5th diode is connected between the 13 resistance and the 14 resistance in the soft start charging circuit, and the negative electrode of the 5th diode is connected with the anode of the 3rd diode, the positive pole of the 6th electric capacity respectively; The anode of the 3rd diode is connected with the positive pole of the 6th electric capacity, and its negative electrode is connected with an end, the pulse power charging circuit of the 4th resistance respectively; The other end of the 4th resistance is connected with negative pole, the pulse power charging circuit of the 6th electric capacity; One end of described the 9th resistance is connected with the anode of the negative electrode of the 5th diode, the 3rd diode, the positive pole of the 6th electric capacity, and its other end is connected with the base stage of the 11 resistance, the 4th triode; One end of the 11 resistance is connected with the base stage of the 4th triode, and the other end is connected with the negative pole of the 6th electric capacity; The emitter of the 4th triode is connected with the negative pole of the 6th electric capacity, and its collector electrode is connected with pulse generating circuit, and the negative pole of the 6th electric capacity is connected with the positive pole of filter capacitor, the 14 resistance in the soft start charging circuit respectively;
Described pulse power charging circuit comprises transformer, first diode, first triode, second resistance, second diode and first electric capacity, described first electric capacity is electrochemical capacitor, the elementary two ends of transformer are connected with a phase line with the zero line of three-phase alternating-current supply respectively, its secondary end is connected with the collector electrode of the 3rd triode in the filter capacitor voltage detecting circuit, its secondary other end is connected with the anode of first diode, the negative electrode of first diode is connected with the emitter of first triode, the base stage of first triode is connected with the anode of second diode, and the negative electrode of second diode is connected with current detecting switch decision circuit; The collector electrode of first triode is connected with positive pole, the pulse generating circuit of first electric capacity; The negative pole of first electric capacity is connected with the positive pole of current detecting switch decision circuit, filter capacitor; Described second resistance, one end is connected between the emitter of the negative electrode of first diode and first triode, and the other end is connected between the anode of the base stage of first triode and second diode;
Described pulse generating circuit comprises first resistance, second triode, unijunction transistor, the 12 resistance, the 3rd resistance, second electric capacity, the tenth resistance, the 5th electric capacity, the 4th electric capacity and the 8th resistance, one end of first resistance is connected with pulse power charging circuit respectively, and the other end is connected with the emitter of second triode; The collector electrode of second triode is connected with the gate pole of unijunction transistor, and the base stage of second triode is connected with the anode of unijunction transistor; The negative electrode of unijunction transistor is connected with an end of the 12 resistance, and the gate pole of the thyristor in the other end of the 12 resistance and the three-phase bridge rectification series thyristor circuit is connected; One end of the 3rd resistance is connected with the emitter of first resistance, second triode respectively, and the other end is connected with base stage, the anode of unijunction transistor, the current detecting switch decision circuit of second triode respectively; One end of second electric capacity is connected with the anode of unijunction transistor, and the negative pole of the 6th electric capacity, the positive pole of filter capacitor are connected in the other end and the current detecting switch decision circuit; One end of the tenth resistance and the 5th electric capacity all is connected with the negative electrode of unijunction transistor, and the other end all is connected with the negative pole, the positive pole of filter capacitor of the 6th electric capacity in the current detecting switch decision circuit; The 4th electric capacity is in parallel with the 8th resistance, and the one end all is connected with the gate pole of unijunction transistor, the collector electrode of second triode, and the other end all is connected with the negative pole, the positive pole of filter capacitor of the 6th electric capacity in the current detecting switch decision circuit; Described the tenth resistance, the 5th electric capacity, the 4th electric capacity and the 8th resistance all are connected with the soft start charging circuit;
One end of described first resistance is connected with the positive pole, the collector electrode of first triode of first electric capacity in the pulse power charging circuit respectively, and the other end is connected with the emitter of second triode; One end of described the 3rd resistance is connected with the emitter of first resistance, second triode respectively, and the other end is connected with the collector electrode of the 4th triode in the anode of the base stage of second triode, unijunction transistor, the current detecting switch decision circuit respectively;
Described filter capacitor voltage detecting circuit comprises the 6th resistance, the 7th resistance and the 5th resistance of the 3rd triode, the 3rd electric capacity and series connection successively, and described the 3rd electric capacity is electrochemical capacitor; The other end of the 5th resistance is connected with the positive pole of the positive pole of filter capacitor, the 3rd electric capacity, the emitter of the 3rd triode, and the other end of the 6th resistance is connected with the negative pole of filter capacitor, three-phase bridge rectification series thyristor circuit; The negative pole of the 3rd electric capacity is connected between the 7th resistance and the 5th resistance and with the base stage of the 3rd triode and is connected; The base stage of the 3rd triode is connected between the 7th resistance and the 5th resistance, and the collector electrode of the 3rd triode is connected with an end of transformer secondary output in the pulse power charging circuit.
2. the soft-start method of the high power switching power supply of being realized by the described device of claim 1 is characterized in that, comprises the steps:
(1) high power switching power supply powers on by inserting three-phase alternating current;
(2) the soft start charging circuit charges to filter capacitor;
(3) current detecting switch decision circuit detects the electric current of soft start charging circuit, simultaneously, the filter capacitor voltage detecting circuit detects the voltage at filter capacitor two ends, if the electric current of soft start charging circuit and the voltage at filter capacitor two ends all satisfy condition simultaneously, then pulse power charging circuit work;
(4) on the basis of step (3), current detecting switch decision circuit detects the electric current of soft start charging circuit, if the electric current of soft start charging circuit is little of making the 4th triode in the current detecting switch decision circuit end then pulse generating circuit work;
(5) pulse generating circuit produces pulse, triggers the thyristor in the three-phase bridge rectification series thyristor circuit, switches to three-phase bridge rectification series thyristor circuit filter capacitor is charged, and finishes the soft start of high power switching power supply.
3. the soft-start method of high power switching power supply according to claim 2, it is characterized in that, the soft start charging circuit comprises the concrete steps that filter capacitor charges in the described step (2): the electric current on three phase lines of three-phase alternating current is respectively via the 4th diode in the soft start charging circuit, the 6th diode, the 11 diode in the 7th diode and the three-phase bridge rectification series thyristor circuit, the 12 diode, the 13 diode constitutes three-phase bridge rectification circuit output, more successively by the 13 resistance, the 14 resistance charges to filter capacitor;
In the described step (3), when the electric current of soft start charging circuit less than the voltage at set point and filter capacitor two ends during greater than set point, the then first triode conducting in the pulse power charging circuit is so that the work of pulse power charging circuit; Three-phase alternating current provides electric current by its zero line and phase line to transformer, and electric current through first diode, first triode, second resistance, second diode and first electric capacity, carries out energy storage by first electric capacity respectively, is the pulse generating circuit power supply;
In the described step (5), the concrete steps that pulse generating circuit triggers the thyristor in the three-phase bridge rectification series thyristor circuit comprise: the voltage on the 6th electric capacity in the current detecting switch decision circuit with the filter capacitor charging current constantly reduce and when dropping to set point, the 4th triode is become by conducting and ends, pulse generating circuit is via first resistance, the 3rd resistance and second triode are given the charging of second electric capacity, simultaneously, pulse power charging circuit is also given the charging of the 4th electric capacity via first resistance and second triode, when the voltage on second electric capacity rises near the voltage on first electric capacity in the pulse power charging circuit, second triode ends, make the 4th electric capacity through the 8th conductive discharge, unijunction transistor is triggered when the voltage on the 4th electric capacity drops to certain value, forms a pulse voltage and the thyristor in the 12 resistance triggering three-phase bridge rectification series thyristor circuit at the tenth resistance and the 5th electric capacity; After thyristor is triggered, the three-phase bridge rectification circuit that is made of the 8th diode, the 9th diode, the tenth diode and the 11 diode, the 12 diode, the 13 diode charges to filter capacitor via thyristor, thereby finishes the soft start charging circuit to the switching of three-phase bridge rectification series thyristor circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010529928 CN101982934B (en) | 2010-10-29 | 2010-10-29 | Soft starting device and method of high-power switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010529928 CN101982934B (en) | 2010-10-29 | 2010-10-29 | Soft starting device and method of high-power switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101982934A CN101982934A (en) | 2011-03-02 |
| CN101982934B true CN101982934B (en) | 2013-07-03 |
Family
ID=43619829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010529928 Expired - Fee Related CN101982934B (en) | 2010-10-29 | 2010-10-29 | Soft starting device and method of high-power switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101982934B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103580458A (en) * | 2012-07-26 | 2014-02-12 | 珠海格力电器股份有限公司 | Method and device for controlling capacitor charging circuit and capacitor charging circuit |
| CN103066824B (en) * | 2012-12-19 | 2015-10-28 | 华南理工大学 | The accessory power supply started for Switching Power Supply and driving method thereof |
| CN104753329B (en) * | 2015-03-24 | 2017-04-05 | 华南理工大学 | A kind of high power switching power supply soft starting circuit |
| FR3034922A1 (en) * | 2015-04-07 | 2016-10-14 | St Microelectronics Tours Sas | CONTROL CIRCUIT OF A RECTIFIER BRIDGE |
| CN105471034A (en) * | 2015-12-23 | 2016-04-06 | 无锡蕴能科技有限公司 | Environmental self-adaptive control method for electric vehicle charger |
| FR3072520B1 (en) | 2017-10-16 | 2020-09-04 | St Microelectronics Tours Sas | CONTROL CIRCUIT OF A THYRISTOR OR TRIAC |
| CN108494244A (en) * | 2018-05-04 | 2018-09-04 | 江苏理工学院 | A kind of New-energy electric vehicle charging Switching Power Supply front stage circuits |
| CN109586557A (en) * | 2018-12-14 | 2019-04-05 | 上海辛格林纳新时达电机有限公司 | A kind of frequency converter pre-charge system and frequency converter |
| CN112564472B (en) * | 2020-11-30 | 2021-11-26 | 江苏科技大学 | Direct-current high-power supply soft start circuit and method |
| CN114268220B (en) * | 2022-03-03 | 2022-05-24 | 深圳市首航新能源股份有限公司 | Three-level conversion circuit, starting method thereof and electronic equipment |
| CN117458854B (en) * | 2023-12-22 | 2024-03-08 | 安徽雷彻科技有限公司 | Soft start circuit of power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013854A (en) * | 2007-02-08 | 2007-08-08 | 北京航空航天大学 | Main circuit of converter with input compatibility of single phase and three phase |
| CN101102076A (en) * | 2007-08-20 | 2008-01-09 | 威盛电子股份有限公司 | Soft startup circuit of switch power supply and its startup method |
| CN201063534Y (en) * | 2007-08-09 | 2008-05-21 | 中国航天科工集团第三总体设计部 | Soft starting and commutation integrated device for switch power supply |
| CN201830136U (en) * | 2010-10-29 | 2011-05-11 | 华南理工大学 | Soft starting device with high-power switch power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008295158A (en) * | 2007-05-23 | 2008-12-04 | Panasonic Corp | Power supply device |
-
2010
- 2010-10-29 CN CN 201010529928 patent/CN101982934B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013854A (en) * | 2007-02-08 | 2007-08-08 | 北京航空航天大学 | Main circuit of converter with input compatibility of single phase and three phase |
| CN201063534Y (en) * | 2007-08-09 | 2008-05-21 | 中国航天科工集团第三总体设计部 | Soft starting and commutation integrated device for switch power supply |
| CN101102076A (en) * | 2007-08-20 | 2008-01-09 | 威盛电子股份有限公司 | Soft startup circuit of switch power supply and its startup method |
| CN201830136U (en) * | 2010-10-29 | 2011-05-11 | 华南理工大学 | Soft starting device with high-power switch power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101982934A (en) | 2011-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101982934B (en) | Soft starting device and method of high-power switching power supply | |
| CN102419562B (en) | Control method of relay with inductive load, and household appliance | |
| CN101086935A (en) | Controlled solenoid drive circuit and method for providing controlled electricity for solenoid | |
| CN101951249A (en) | Composite contactor | |
| CN201327782Y (en) | Surgeless contactor arc extinguisher | |
| CN104935077A (en) | Anti-interference electricity device for series capacitance type AC contactor and control method thereof | |
| CN201388162Y (en) | Pre-charge control circuit of transducer | |
| CN202424502U (en) | Switching power supply circuit | |
| CN201830136U (en) | Soft starting device with high-power switch power supply | |
| CN201601855U (en) | Pre-charging circuit for inductive heater | |
| CN103023135A (en) | Multi-level direct current transformation power supply device | |
| CN105553245A (en) | Soft start circuit | |
| CN202695292U (en) | Intelligent silent electricity-saving appliance for analog control circuit | |
| CN202550871U (en) | Circuit preventing impact of heavy current in electrifying moment | |
| CN101179245B (en) | Starter of AC motor | |
| CN201369683Y (en) | Capacitance energy-storage commutating power supply | |
| CN201918894U (en) | Soft-starting circuit | |
| CN204068775U (en) | The mutual-inductance contactless current starter of commercial refrigeration compressor electric motor | |
| CN202524627U (en) | Electronic energy-saving lamp ballast circuit | |
| CN2301788Y (en) | Electronic controlled AC contactor | |
| CN203607335U (en) | AC contactor control circuit | |
| CN202231481U (en) | Multi-stage direct-current conversion power supply device | |
| CN203984068U (en) | A kind of electric car charger | |
| CN219247712U (en) | Low-power-consumption capacitor voltage-reducing circuit | |
| CN204068777U (en) | The novel mutual-inductance contactless current starter of a kind of commercial refrigeration compressor electric motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20151029 |
|
| EXPY | Termination of patent right or utility model |