CN108023471A - A kind of soft upper electric system, equipment and its soft powering method - Google Patents
A kind of soft upper electric system, equipment and its soft powering method Download PDFInfo
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- CN108023471A CN108023471A CN201610962235.8A CN201610962235A CN108023471A CN 108023471 A CN108023471 A CN 108023471A CN 201610962235 A CN201610962235 A CN 201610962235A CN 108023471 A CN108023471 A CN 108023471A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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Abstract
The present invention provides a kind of soft upper electric system, equipment and its soft powering method, soft upper electric system includes：Bidirectional thyristor, uncontrollable rectifier unit, boost boosting units and electrolytic capacitor；One end of bidirectional thyristor and one end of AC power connect, and the other end is connected with the first end of uncontrollable rectifier unit；4th end of uncontrollable rectifier unit and the other end of AC power connect, and two output terminals are connected with boost boosting units, and boost boosting units are connected with electrolytic capacitor；Switching Power Supply is connected to the both ends of electrolytic capacitor；The change of the alternating voltage that bidirectional thyristor is provided with AC power and on or off, and AC power charges electrolytic capacitor in conducting, when the voltage of electrolytic capacitor reaches maximum, realizes and the soft of rear class Switching Power Supply is powered on.The present invention to power on current overshoot small；Circuit structure is simple, and element used is few, applied widely；Electrochemical capacitor life is grown.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a soft power-on system and equipment of an infinite current resistor based on a thyristor and a soft power-on method thereof.
Background
The power electronic converter is an integral control circuit which is composed of power semiconductor equipment, a conductive bus, an instrument and the like and can complete electric energy property conversion. The aim of power electronic technology research is to utilize high-performance power semiconductor devices and apply advanced control theory and means to control the power switch devices so as to meet the requirement of converting the form of electric energy. At present, the application range of the power electronic conversion device powered by the single-phase alternating current power supply is very wide, wherein the single-phase active power factor corrector is widely applied to the front-stage circuit of the alternating current-direct current converter of the frequency conversion household appliance power circuit to realize the AC-DC conversion and eliminate the harmonic pollution. The bridged single-phase active power factor corrector comprises two parts: a single-phase diode uncontrolled rectifier bridge and a boost circuit. The output end of the single-phase power factor corrector is connected with the electrolytic capacitor and supplies power to the rear-stage switching power supply after being filtered by the filter capacitor. In order to make the switching power supply obtain stable voltage, ripple waves of output voltage of the single-phase power factor corrector need to be reduced, so that a large-capacity electrolytic capacitor needs to be used, but when the single-phase alternating-current power supply is electrified, the large-capacity electrolytic capacitor causes large impact current, current waveform distortion causes harmonic pollution, and more seriously, the large current can damage circuit elements, so that the circuit cannot be started or the circuit fails, and therefore, the adoption of electrifying current limiting measures plays an important role in normal starting of the circuit.
Generally, a current limiting resistor is connected in series in a circuit to limit a power-on current, and the current limiting resistor can be classified into two types according to whether to cut off the current limiting resistor:
(1) cutting off the current-limiting resistor by using a relay after the starting is finished; by adopting the method, the impact of secondary current can be caused when the resistor is cut off;
(2) the Negative Temperature Coefficient (NTC) thermistor with the Negative Temperature characteristic is connected in series, and the current-limiting resistor is not cut off after the start-up is finished.
After searching the prior art, the soft power-on circuit using the current-limiting resistor has more or less defects, and therefore, those skilled in the art are dedicated to find an effective soft power-on system.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a soft power-on system, a device and a soft power-on method thereof, which are used to solve the problem of excessive resistance loss or secondary current impact caused by soft power-on implemented by using a current-limiting resistor in the prior art.
In order to achieve the above and other related objects, the present invention provides a soft power-on system for soft power-on of a rear stage switching power supply of the soft power-on system, wherein the soft power-on system includes: the bidirectional thyristor, the uncontrolled rectifying unit, the boost unit and the electrolytic capacitor; one end of the bidirectional thyristor is connected with one end of an alternating current power supply, and the other end of the bidirectional thyristor is connected with the first end of the uncontrolled rectifying unit; the first end of the uncontrolled rectifying unit is connected with the other end of the bidirectional thyristor, the second end of the uncontrolled rectifying unit is connected with the first end of the boost unit, the third end of the uncontrolled rectifying unit is respectively connected with the second end of the boost unit and the negative electrode of the electrolytic capacitor, and the fourth end of the uncontrolled rectifying unit is connected with the other end of the alternating current power supply; the first end of the boost unit is connected with the second end of the uncontrolled rectifying unit; the second end of the electrolytic capacitor is connected with the third end of the uncontrolled rectifying unit and the negative electrode of the electrolytic capacitor respectively; the third end is connected with the anode of the electrolytic capacitor; the rear-stage switching power supply is connected to two ends of the electrolytic capacitor; the bidirectional thyristor is switched on or off along with the change of alternating voltage provided by the alternating current power supply, and the alternating current power supply charges the electrolytic capacitor when the bidirectional thyristor is switched on; and when the voltage of the electrolytic capacitor reaches the maximum value, soft power-on of the rear-stage switching power supply is realized.
In an embodiment of the present invention, the uncontrolled rectifying unit includes: a first power diode, a second power diode, a third power diode, and a fourth power diode; the positive electrode of the first power diode is used as the first end of the uncontrolled rectifying unit and is respectively connected with the other end of the bidirectional thyristor and the negative electrode of the third power diode, and the negative electrode of the first power diode is connected with the negative electrode of the second power diode; the negative electrode of the second power diode is used as the second end of the uncontrolled rectifying unit and is also connected with the first end of the boost unit; the anode of the second power diode is connected with the other end of the alternating current power supply and the cathode of the fourth power diode respectively; the anode of the third power diode is used as the third end of the uncontrolled rectifying unit and is respectively connected with the anode of the fourth power diode, the second end of the boost unit and the cathode of the electrolytic capacitor, and the cathode of the third power diode is respectively connected with the other end of the bidirectional thyristor and the anode of the first power diode; the anode of the fourth power diode is respectively connected with the anode of the third power diode, the second end of the boost unit and the cathode of the electrolytic capacitor; and the negative electrode is used as the fourth end of the uncontrolled rectifying unit and is respectively connected with the other end of the alternating current power supply and the positive electrode of the second power diode.
In an embodiment of the invention, the soft power-on system further includes a first filter capacitor, and the first filter capacitor is connected between the anode of the first power diode and the cathode of the fourth power diode.
In an embodiment of the present invention, the boost unit includes a boost inductor, a fifth power diode, and an IGBT; one end of the boost inductor is used as the first end of the boost unit and is connected with the second end of the uncontrolled rectifying unit, and the other end of the boost inductor is respectively connected with the anode of the fifth power diode and the collector of the IGBT; the anode of the fifth power diode is connected with the other end of the boost inductor, and the cathode of the fifth power diode is used as the third end of the boost unit and is connected with the anode of the electrolytic capacitor; the collector of the IGBT is connected with the other end of the boost inductor and the anode of the fifth power diode respectively; and the emitter is used as the second end of the boost unit and is respectively connected with the third end of the uncontrolled rectifying unit and the negative electrode of the electrolytic capacitor.
In an embodiment of the invention, the soft power-on system further includes a pull-down resistor, and the pull-down resistor is connected between the first end and the second end of the boost unit.
In an embodiment of the present invention, the soft power-on system further includes a second filter capacitor; the second filter capacitor is connected to two ends of the electrolytic capacitor.
In an embodiment of the invention, the soft power-on system further includes a sixth power diode, an anode of the sixth power diode is connected to the second end of the uncontrolled rectifying unit, and a cathode of the sixth power diode is connected to the anode of the electrolytic capacitor.
The invention discloses a soft power-on device which comprises the soft power-on system.
The invention also discloses a soft power-on method for realizing the soft power-on of the rear-stage switching power supply of the soft power-on system, which comprises the following steps: switching on an alternating current power supply of the soft power-on system, and switching off an IGBT of a boost unit of the soft power-on system; charging an electrolytic capacitor of the soft power-on system: when the alternating voltage provided by the alternating current power supply is increased to be close to zero point, a bidirectional thyristor of the soft power-on system is conducted, the bidirectional thyristor, the uncontrolled rectifying unit, the electrolytic capacitor of the soft power-on system, a boost inductor of the boost unit and a fifth power diode form a loop, the alternating current power supply charges the electrolytic capacitor, and the voltage of the electrolytic capacitor is increased; when the alternating voltage provided by the alternating current power supply is reduced to zero, the bidirectional thyristor is turned off, the alternating current power supply does not charge the electrolytic capacitor, and the voltage of the electrolytic capacitor is kept unchanged; when the voltage of the electrolytic capacitor reaches the maximum value, the IGBT is conducted, and soft electrification is achieved on the rear-stage switch power supply.
The invention discloses a soft power-on method, which realizes the soft power-on of a rear-stage switch power supply of a soft power-on system and comprises the following steps: switching on an alternating current power supply of the soft power-on system, and switching off an IGBT of a boost unit of the soft power-on system; charging an electrolytic capacitor of the soft power-on system: when the alternating voltage provided by the alternating current power supply is increased to be close to zero point, the bidirectional thyristor of the soft power-on system is conducted, the bidirectional thyristor, the uncontrolled rectifier unit, the sixth power diode and the electrolytic capacitor of the soft power-on system form a loop, the electrolytic capacitor is in a charging state, and the voltage of the electrolytic capacitor is increased; when the alternating voltage provided by the alternating current power supply is reduced to zero, the bidirectional thyristor is turned off, the electrolytic capacitor is in a non-charging state, and the voltage of the electrolytic capacitor is kept unchanged; when the voltage of the electrolytic capacitor reaches the maximum value, the IGBT is conducted, and soft electrification is achieved on the rear-stage switch power supply.
As described above, according to the soft power-on system, the soft power-on device and the soft power-on method thereof, the bidirectional thyristor is added as the switch on the basis of the existing bridged single-phase active power factor corrector, and the on-off time of the bidirectional thyristor is adjusted by using the voltage change of the alternating current power supply, so that the charging of the electrolytic capacitor is controlled, the voltage of the electrolytic capacitor can gradually rise according to an expected curve, and the service life of the electrolytic capacitor is effectively prolonged; and the on-off of the bidirectional thyristor controls the fractional charging of the electrolytic capacitor, so that the power-on current is adjusted to be small, and the soft power-on is realized. The circuit of the invention has simple structure, less used elements, cheap thyristor, convenient model selection and wide application range.
Drawings
Fig. 1 is a schematic circuit schematic structural diagram of a soft power-on system according to an embodiment of the present invention.
Fig. 2 is a schematic circuit schematic structural diagram of a soft power-on system according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a soft power-on method according to an embodiment of the present invention.
Fig. 4 is a schematic diagram showing the state of the triac and the voltage of the electrolytic capacitor according to the ac voltage variation of the ac power source in the soft power-on method according to the embodiment of the present invention.
Description of the element reference numerals
110 uncontrolled rectifying unit
120 Boost unit
200 latter stage switch power supply
S31-S33
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
Please refer to the attached drawings. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The invention provides a soft power-on system, equipment and a soft power-on method of an infinite current resistor based on a thyristor, which are based on the existing bridged single-phase active power factor corrector, a bidirectional thyristor is added as a switch, the bidirectional thyristor is switched on or off through the conversion of alternating voltage provided by an alternating current power supply, and an electrolytic capacitor is charged in the switching-on time, so that the power-on current is adjustable, and the soft power-on is realized under the condition of not increasing a current-limiting resistor.
Example 1
The present embodiment provides a soft power-on system of an infinite current resistor based on a thyristor, as shown in fig. 1, including: a bidirectional thyristor S0, an uncontrolled rectifier unit 110, a boost unit 120 and an electrolytic capacitor EC 1.
One end of the triac S0 is connected to one end of the ac power source, and the other end is connected to the first end of the uncontrolled rectifying unit 120.
The uncontrolled rectifying unit 110 is an uncontrolled rectifying bridge, and a first end of the uncontrolled rectifying unit is connected with the bidirectional thyristor S0, and a second end of the uncontrolled rectifying unit is connected with a first end of the boost unit 120; the third end is respectively connected with the second end of the boost unit and the negative electrode of the electrolytic capacitor EC 1.
The uncontrolled rectifier bridge includes a first power diode D1, a second power diode D2, a third power diode D3, and a fourth power diode D4. Wherein,
the anode of the first power diode D1 is used as the first end of the uncontrolled rectifier unit 110 and is connected with the other end of the bidirectional thyristor S0; the negative electrode of the second power diode is connected with the negative electrode of the second power diode and the first end of the boost unit;
the anode of the second power diode D2 is connected to the ac power source and the cathode of the fourth power diode D4, respectively, and the cathode is used as the second end of the uncontrolled rectifying unit 110 and is connected to the cathode of the first power diode D1 and the first end of the boost unit 120, respectively;
the anode of the third power diode D3 is used as the third end of the uncontrolled rectifying unit 110, and is respectively connected with the anode of the fourth power diode D4, the second end of the boost unit and the cathode of the electrolytic capacitor EC 1; the negative electrode of the bidirectional thyristor S0 is connected with the other end of the bidirectional thyristor and the positive electrode of the first power diode D1;
the anode of the fourth power diode D4 is connected to the anode of the third power diode D3, the second end of the boost unit 120 and the cathode of the electrolytic capacitor, respectively; the negative electrode is used as the fourth terminal of the uncontrolled rectifying unit 110 and is respectively connected with the other end of the alternating current power supply and the positive electrode of the second power diode D2.
The anode of the third power diode D3 and the anode of the fourth power diode D4 are grounded.
The Boost unit employs a Boost converter (the Boost converter), which is a common switching dc Boost circuit for making the output voltage higher than the input voltage. Preferably the boost circuit comprises a boost inductor L1, a fifth power diode D5 and an IGBT (Insulated Gate Bipolar Transistor) S1. And,
one end of the boost inductor L1, serving as the first end of the boost unit 120, is connected to the second end of the uncontrolled rectifying unit 110, that is, the negative electrode of the second power diode D2 of the uncontrolled rectifying bridge, and the other end is connected to the positive electrode of the fifth power diode D5 and the collector of the IGBT S1, respectively;
the anode of the fifth power diode D5 is connected to the other end of the boost inductor L1 and the collector of the IGBT S1, and the cathode is used as the third end of the boost unit 120 and connected to the anode of the electrolytic capacitor EC 1;
the collector of the IGBT S1 is connected with the other end of the boost inductor L1 and the anode of the fifth power diode D5 respectively; the emitter serves as a second end of the boost unit 120 and is connected to the negative electrode of the electrolytic capacitor EC 1.
The rear stage switching power supply 200 of the soft power-on system is connected in parallel to two ends of the electrolytic capacitor EC 1.
The bidirectional thyristor S0, the 4 power diodes D1-D4 of the uncontrolled rectifying unit 110, the boost inductor L1, the fifth power diode D5 and the electrolytic capacitor EC1 form a soft-charging circuit. The bidirectional thyristor S0 is based on the AC voltage u of the AC power supplyiAnd the alternating current power supply charges the electrolytic capacitor EC1 when the triac S0 is in the on state. Voltage u at electrolytic capacitor EC1oWhen the maximum value is reached, the rear stage switching power supply 200 is soft-powered on.
Further, in the present embodiment, the ac power supply is preferably a 220V single-phase ac power supply; 5 power diodes (DA-D5), preferably 600V/25A/100 deg.C; the boosting inductor is preferably 500 muH; the electrolytic capacitor EC1 preferably adopts an energy storage electrolytic capacitor of 400V/3300 muF; the bidirectional thyristor S0 is preferably a 600V/25A/100 ℃ bidirectional thyristor for controlling the electrifying current; the IGBT S1 is preferably a 600V/25A/100 ℃ IGBT for controlling the current flowing through the boost inductor L1 so that the power factor is 1.
In a preferred embodiment of the present invention, the soft power-on system further includes a first filter capacitor C1, a second filter capacitor C2, and a pull-down resistor R1. The first filter capacitor C1 is connected between the anode of the first power diode D1 and the cathode of the fourth power diode D4 of the uncontrolled rectifying unit 110; the second filter capacitor C2 is connected to two ends of the electrolytic capacitor EC 1; the pull-down resistor R1 is connected between the boost inductor and the emitter of the IGBT S1. The first filter capacitor C1 and the second filter capacitor are preferably 2.0 muF/400V; the pull-down resistor R1 was a resistor of 100 k.OMEGA.100 ℃ and 10W.
In addition, in order to highlight the innovative part of the present invention, a unit which is not so closely related to solve the technical problem proposed by the present invention is not introduced in the present embodiment, but this does not indicate that there is no other unit in the present embodiment.
Example 2
The present embodiment provides a soft power-on system of an infinite current resistor based on a thyristor, which is similar to the soft power-on system provided in embodiment 1, except that a sixth power diode D6 is added to the soft power-on system, as shown in fig. 2, a positive electrode D6 of the sixth power diode is respectively connected to the second terminal of the uncontrolled rectifying unit 110 (i.e., a negative electrode of the second power diode D2) and the first terminal of the boost unit 120 (i.e., one terminal of the boost inductor L1); the negative electrode is connected to the third terminal of the boost unit 120 (i.e., the negative electrode of the fifth power diode) and the positive electrode of the electrolytic capacitor EC1, respectively. The bidirectional thyristor S0, the 4 power diodes D1-D4 of the uncontrolled rectifying unit 110, the sixth power diode D6 and the electrolytic capacitor EC1 form a soft power-up loop. Compared with the soft power-up circuit provided in example 1, the soft power-up circuit of this embodiment consumes less power and the electrolytic capacitor EC1 is charged faster.
Example 3
The present embodiment discloses a method for performing soft power-on by using the soft power-on system disclosed in embodiment 1, as shown in fig. 3, the method specifically includes:
step S31, an alternating current power supply of a soft power-on system is switched on, and an IGBT of a boost unit of the soft power-on system is switched off;
step S32, charging an electrolytic capacitor of the soft power-on system:
referring to fig. 4, the first curve in fig. 4 is a voltage waveform diagram of an ac power supply; the second columnar wave is a turn-on and turn-off state diagram of the bidirectional thyristor; the third is the voltage transformation curve of the electrolytic capacitor.
The current supplied by the ac power source varies periodically with time. As shown in fig. 4, the ac voltage provided by the ac power supply used in this embodiment varies sinusoidally:
at an alternating voltage u supplied by an alternating current sourceiWhen the voltage rises to be close to zero point, the bidirectional thyristor of the soft power-on system is conducted, the bidirectional thyristor, the uncontrolled rectifying unit, the boost inductor, the fifth power diode and the electrolytic capacitor of the soft power-on system form a soft power-on loop, the electrolytic capacitor is charged by the alternating current power supply, and the voltage u of the electrolytic capacitoro(ii) is increased; the boost inductor can play a role in inhibiting current mutation;
following this, the AC voltage u of the AC power supplyiWill continue to rise, after rising to the maximum, the alternating voltage will decline, when the alternating voltage drops to the zero point, the bidirectional thyristor turns off naturally, the alternating current power supply will not charge the electrolytic capacitor, the voltage u of the electrolytic capacitoroKeeping the mixture unchanged;
further, when the AC voltage u of the AC power source is higher than the predetermined valueiWhen the voltage rises to be close to zero for the second time, the bidirectional thyristor can be triggered in advance, the alternating current power supply charges the electrolytic capacitor, and the voltage u of the electrolytic capacitoroRising again;
then, when the AC voltage u of the AC power supplyiWhen the voltage is reduced to zero for the second time, the bidirectional thyristor is naturally turned off, the alternating current power supply does not charge the electrolytic capacitor any more, and the voltage u of the electrolytic capacitoroKeeping the mixture unchanged;
each time thereafter an alternating voltage u is supplied by an alternating current sourceiTriggering the bidirectional thyristor before rising to the zero point, wherein the time of each triggering is earlier than that of the previous triggering, and the voltage u of the electrolytic capacitor after each chargingoAll rise and eventually reach a maximum. After the soft power-on is completed, the circuit enters a normal working state.
Step S33, when the voltage u of the electrolytic capacitoroWhen the maximum value is reached, the IGBT of the boost unit is conducted, soft power-on is realized on the rear stage switching power supply, and the circuit enters a normal working state.
Example 4
This example discloses a method for soft power-up using the soft power-up system disclosed in example 1, which is similar to the soft power-up method disclosed in example 3, except that the soft power-up circuit is different when the electrolytic capacitor is charged. The soft power-on circuit adopted in the embodiment is a bidirectional thyristor, 4 power diodes (D1-D4) of an uncontrolled rectifying unit, a sixth power diode and an electrolytic capacitor.
In summary, according to the soft power-on system, the soft power-on device and the soft power-on method thereof, the bidirectional thyristor is added as a switch on the basis of the existing bridged single-phase active power factor corrector, and the on-off time of the bidirectional thyristor is adjusted by using the voltage change of the alternating current power supply, so that the charging of the electrolytic capacitor is controlled, the voltage of the electrolytic capacitor can gradually rise according to an expected curve, and the service life of the electrolytic capacitor is effectively prolonged; and the on-off of the bidirectional thyristor controls the fractional charging of the electrolytic capacitor, so that the power-on current is adjusted to be small, and the soft power-on is realized. The circuit of the invention has simple structure, less used elements, cheap thyristor, convenient model selection and wide application range. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A soft power-on system is characterized in that the system is used for realizing soft power-on of a rear-stage switching power supply after the soft power-on system, and the system comprises: the bidirectional thyristor, the uncontrolled rectifying unit, the boost unit and the electrolytic capacitor;
one end of the bidirectional thyristor is connected with one end of an alternating current power supply, and the other end of the bidirectional thyristor is connected with the first end of the uncontrolled rectifying unit;
the first end of the uncontrolled rectifying unit is connected with the other end of the bidirectional thyristor, the second end of the uncontrolled rectifying unit is connected with the first end of the boost unit, the third end of the uncontrolled rectifying unit is respectively connected with the second end of the boost unit and the negative electrode of the electrolytic capacitor, and the fourth end of the uncontrolled rectifying unit is connected with the other end of the alternating current power supply;
the first end of the boost unit is connected with the second end of the uncontrolled rectifying unit; the second end of the electrolytic capacitor is connected with the third end of the uncontrolled rectifying unit and the negative electrode of the electrolytic capacitor respectively; the third end is connected with the anode of the electrolytic capacitor;
the rear-stage switching power supply is connected to two ends of the electrolytic capacitor;
the bidirectional thyristor is switched on or off along with the change of alternating voltage provided by the alternating current power supply, and the electrolytic capacitor is charged when the alternating current power supply is switched on; and when the voltage of the electrolytic capacitor reaches the maximum value, soft power-on of the rear-stage switching power supply is realized.
2. The soft power-on system according to claim 1, wherein: the uncontrolled rectifying unit comprises: a first power diode, a second power diode, a third power diode, and a fourth power diode; wherein,
the anode of the first power diode is used as the first end of the uncontrolled rectifying unit and is respectively connected with the other end of the bidirectional thyristor and the cathode of the third power diode, and the cathode of the first power diode is connected with the cathode of the second power diode;
the negative electrode of the second power diode is used as the second end of the uncontrolled rectifying unit and is also connected with the first end of the boost unit; the anode of the second power diode is connected with the other end of the alternating current power supply and the cathode of the fourth power diode respectively;
the anode of the third power diode is used as the third end of the uncontrolled rectifying unit and is respectively connected with the anode of the fourth power diode, the second end of the boost unit and the cathode of the electrolytic capacitor, and the cathode of the third power diode is respectively connected with the other end of the bidirectional thyristor and the anode of the first power diode;
the anode of the fourth power diode is respectively connected with the anode of the third power diode, the second end of the boost unit and the cathode of the electrolytic capacitor; and the negative electrode is used as the fourth end of the uncontrolled rectifying unit and is respectively connected with the other end of the alternating current power supply and the positive electrode of the second power diode.
3. The soft power-on system according to claim 2, wherein: the soft power-on system further comprises a first filter capacitor, and the first filter capacitor is connected between the anode of the first power diode and the cathode of the fourth power diode.
4. The soft power-on system according to claim 1, wherein: the boost unit comprises a boost inductor, a fifth power diode and an IGBT;
one end of the boost inductor is used as the first end of the boost unit and is connected with the second end of the uncontrolled rectifying unit, and the other end of the boost inductor is respectively connected with the anode of the fifth power diode and the collector of the IGBT;
the anode of the fifth power diode is connected with the other end of the boost inductor, and the cathode of the fifth power diode is used as the third end of the boost unit and is connected with the anode of the electrolytic capacitor;
the collector of the IGBT is connected with the other end of the boost inductor and the anode of the fifth power diode respectively; and the emitter is used as the second end of the boost unit and is respectively connected with the third end of the uncontrolled rectifying unit and the negative electrode of the electrolytic capacitor.
5. The soft power-on system according to claim 1, wherein: the soft power-on system further comprises a pull-down resistor, and the pull-down resistor is connected between the first end and the second end of the boost unit.
6. The soft power-on system according to claim 1, wherein: the soft power-on system also comprises a second filter capacitor;
the second filter capacitor is connected to two ends of the electrolytic capacitor.
7. The soft power-on system according to claim 1, wherein: the soft power-on system further comprises a sixth power diode, wherein the anode of the sixth power diode is connected with the second end of the uncontrolled rectifying unit, and the cathode of the sixth power diode is connected with the anode of the electrolytic capacitor.
8. A soft powered device, characterized in that: the soft power-on device comprises the soft power-on system as claimed in any one of claims 1-7.
9. A soft power-on method is characterized in that soft power-on of a rear-stage switching power supply after a soft power-on system is realized, and the soft power-on method comprises the following steps:
switching on an alternating current power supply of the soft power-on system, and switching off an IGBT of a boost unit of the soft power-on system;
charging an electrolytic capacitor of the soft power-on system: when the alternating voltage provided by the alternating current power supply is increased to be close to zero point, a bidirectional thyristor of the soft power-on system is conducted, the bidirectional thyristor, the uncontrolled rectifying unit, the electrolytic capacitor of the soft power-on system, a boost inductor of the boost unit and a fifth power diode form a loop, the alternating current power supply charges the electrolytic capacitor, and the voltage of the electrolytic capacitor is increased; when the alternating voltage provided by the alternating current power supply is reduced to zero, the bidirectional thyristor is turned off, the alternating current power supply does not charge the electrolytic capacitor, and the voltage of the electrolytic capacitor is kept unchanged;
when the voltage of the electrolytic capacitor reaches the maximum value, the IGBT is conducted, and soft electrification is achieved on the rear-stage switch power supply.
10. A soft power-on method is characterized in that soft power-on of a rear-stage switching power supply after a soft power-on system is realized, and the soft power-on method comprises the following steps:
switching on an alternating current power supply of the soft power-on system, and switching off an IGBT of a boost unit of the soft power-on system;
charging an electrolytic capacitor of the soft power-on system: when the alternating voltage provided by the alternating current power supply is increased to be close to zero point, the bidirectional thyristor of the soft power-on system is conducted, the bidirectional thyristor, the uncontrolled rectifier unit, the sixth power diode and the electrolytic capacitor of the soft power-on system form a loop, the electrolytic capacitor is in a charging state, and the voltage of the electrolytic capacitor is increased; when the alternating voltage provided by the alternating current power supply is reduced to zero, the bidirectional thyristor is turned off, the electrolytic capacitor is in a non-charging state, and the voltage of the electrolytic capacitor is kept unchanged;
when the voltage of the electrolytic capacitor reaches the maximum value, the IGBT is conducted, and soft electrification is achieved on the rear-stage switch power supply.
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