CN217590607U - Switching power supply and valley filling circuit - Google Patents
Switching power supply and valley filling circuit Download PDFInfo
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- CN217590607U CN217590607U CN202123203116.XU CN202123203116U CN217590607U CN 217590607 U CN217590607 U CN 217590607U CN 202123203116 U CN202123203116 U CN 202123203116U CN 217590607 U CN217590607 U CN 217590607U
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- 238000004146 energy storage Methods 0.000 claims abstract description 118
- 238000004804 winding Methods 0.000 claims abstract description 111
- 238000002360 preparation method Methods 0.000 claims 1
- 244000062793 Sorghum vulgare Species 0.000 abstract description 2
- 235000019713 millet Nutrition 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 62
- 238000010586 diagram Methods 0.000 description 12
- 230000001052 transient effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model relates to a switching power supply field discloses a switching power supply and fill out millet circuit, and wherein, switching power supply includes first energy storage unit, second energy storage unit, first diode, second diode, third diode, first switch, second switch, first winding, second winding. The utility model discloses applicable to wide voltage input's switching power supply field, when input voltage was when low-voltage input, control first switch and second switch switched on, when input voltage was high-voltage input, control first switch and second switch turn-off. When the energy storage unit is electric capacity, the utility model discloses switching power supply can provide suitable filtering capacity for the input voltage of different scopes, and can improve the PF value when the high pressure is imported and solve the problem that big electric capacity output voltage fluctuation is big and impulse current when the low pressure is imported, reduces system's volume simultaneously, reduce cost.
Description
Technical Field
The utility model relates to a switching power supply field especially relates to wide voltage input's switching power supply and fill out millet circuit.
Background
In industrial and civil fields, alternating current of various power grids is often required to be rectified into direct current, in order to enable a switching power supply to meet global power grid standards, the input voltage of the switching power supply needs to be designed to meet wide-range input voltage requirements, so that not only is the power supply design difficult, but also the model selection specifications of passive devices in a circuit are increased, the size and the weight of the circuit are increased, and higher cost pressure is brought. And when the main power circuit of the switching power supply adopts a double-tube series connection scheme, the phenomenon of transient uneven voltage of a main power switching tube exists.
Referring to fig. 1, fig. 1 is a connection diagram of a valley filling circuit and a main power circuit in a conventional switching power supply, wherein the valley filling circuit includes a capacitor C1, a capacitor C2, a diode D1, a diode D2, a diode D3, a switch S1 and a switch S2; the main power circuit comprises a first winding L1, a first switch tube Q3, a second winding L2 and a second switch tube Q4 which are sequentially connected in series.
The traditional switching power supply has the characteristics of series charging and parallel discharging, namely under the condition of high-voltage input, the switch S1 and the switch S2 are switched off, and the capacitor C1 and the capacitor C2 form a series loop for charging; under the condition of low-voltage input, the switches S1 and S2 are conducted, and the capacitor C1 and the capacitor C2 are connected in parallel to discharge to the load, so that the power factor (PF value) is improved when the high-voltage input is carried out, the problem of large fluctuation of output voltage when the low-voltage input is carried out can be effectively solved, and the impact current is restrained. However, the switching power supply has the following defects: because the main power circuit of the switching power supply adopts a multi-tube series connection scheme, the first switching tube Q3 and the second switching tube Q4 have the condition of non-voltage-sharing on the occasion of transient work (such as a short-circuit condition) of the switching power supply.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses mainly can be used to solve the main power and use the switching power supply of multitube series connection to press the problem unevenly in the main power switch pipe in work especially transient state work, the utility model discloses the purpose is realized through following technical scheme:
the first scheme is as follows: a switching power supply, comprising: the main power circuit is provided with a first winding, a second winding, a first switch tube and a second switch tube;
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a diode and a third switching tube;
the anode of the first energy storage unit is used for being connected with the positive input end of the switching power supply, the anode of the first energy storage unit is connected with the first end of the first winding, and the cathode of the first energy storage unit is respectively connected with the source of the first switching tube, the anode of the diode and the drain of the third switching tube; the second end of the first winding is connected with the drain electrode of the first switching tube; the cathode of the diode is connected with the anode of the second energy storage unit and the first end of the second winding, and the second end of the second winding is connected with the drain electrode of the second switching tube; and the cathode of the second energy storage unit is respectively connected with the source stage of the second switching tube and the source stage of the third switching tube and is connected to the ground.
The second scheme is as follows: a switching power supply, comprising: a main power circuit and a valley filling circuit, wherein the main power circuit is provided with a first winding, a second winding, a first switch tube and a second switch tube,
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a diode and a third switching tube;
the positive pole of the first energy storage unit is used for being connected with the positive input end of the switching power supply, the positive pole of the first energy storage unit is connected with the first end of the first winding, the negative pole of the first energy storage unit is connected with the source level of the first switching tube and the positive pole of the diode, the second end of the first winding is connected with the drain electrode of the first switching tube, the negative pole of the diode is respectively connected with the positive pole of the second energy storage unit, the source level of the third switching tube and the first end of the second winding, the second end of the second winding is connected with the drain electrode of the second switching tube, and the negative pole of the second energy storage unit is connected with the source level of the second switching tube and is connected to the ground.
Preferably, the third switching tube is an MOS tube, a relay, a triode, a thyristor or an IGBT; the first energy storage unit and the second energy storage unit are energy storage devices with consistent parameters.
In the third scheme: a switching power supply, comprising: the main power circuit is provided with a first winding, a second winding, a first switching tube and a second switching tube;
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a diode, a third switching tube and a fourth switching tube;
the positive electrode of the first energy storage unit is used for being connected with the positive input end of the switching power supply, the positive electrode of the first energy storage unit is respectively connected with the first end of the first winding and the drain electrode of the fourth switching tube, and the negative electrode of the first energy storage unit is respectively connected with the drain electrode of the third switching tube, the source electrode of the first switching tube and the anode of the diode; the second end of the first winding is connected with the drain electrode of the first switching tube, the cathode of the diode is respectively connected with the anode of the second energy storage unit, the source electrode of the fourth switching tube and the first end of the second winding, the second end of the second winding is connected with the drain electrode of the second switching tube, and the source electrode of the third switching tube is respectively connected with the cathode of the second energy storage unit and the source electrode of the second switching tube and is connected to the ground.
In an embodiment, when the switching power supply operates, the third switching tube and the second switching tube are turned on and off simultaneously.
A fourth scheme: a switching power supply, comprising: the main power circuit is provided with a first winding, a second winding, a third winding, a first switching tube, a second switching tube and a third switching tube;
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a third energy storage unit, a first diode, a second diode, a fourth switching tube, a fifth switching tube, a sixth switching tube and a seventh switching tube;
the positive electrode of the first energy storage unit is used for being connected with the positive input end of the switching power supply, the positive electrode of the first energy storage unit is respectively connected with the first end of the first winding, the drain electrode of the fifth switching tube and the drain electrode of the seventh switching tube, and the negative electrode of the first energy storage unit is connected with the drain electrode of the fourth switching tube, the source electrode of the first switching tube and the anode of the first diode;
the second end of the first winding is connected with the drain electrode of the first switch tube, and the cathode of the first diode is respectively connected with the anode of the second energy storage unit, the first end of the second winding and the source electrode of the fifth switch tube;
the second end of the second winding is connected with the drain electrode of the second switching tube, and the cathode of the second energy storage unit is respectively connected with the anode of the second diode, the source of the second switching tube and the drain electrode of the sixth switching tube;
the cathode of the second diode is connected with the anode of the third energy storage unit, the source of the seventh switch tube and the first end of the third winding respectively, the second end of the third winding is connected with the drain of the third switch tube, and the source of the third switch tube is connected with the cathode of the third energy storage unit, the source of the sixth switch tube and the source of the fourth switch tube and connected to the ground.
In an embodiment, the switching power supply is further provided with another valley filling circuit connected in parallel with the valley filling circuit.
The fifth scheme is as follows: the valley filling circuit is used in a switching power supply, the switching power supply is provided with a main power circuit, and the main power circuit is provided with a first winding, a second winding, a first switching tube connected with the first winding in series and a second switching tube connected with the second winding in series; the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a diode, a third switching tube and a fourth switching tube;
the first energy storage unit is connected in parallel at two ends of a series branch composed of the first winding and the first switching tube, and the anode of the first energy storage unit is used for being connected with the positive input end of the switching power supply;
the second energy storage unit is connected in parallel at two ends of a series branch consisting of the second winding and the second switching tube;
the anode of the diode is connected with the cathode of the first energy storage unit, and the cathode of the diode is connected with one end of the second winding and the anode of the second energy storage unit;
the drain electrode of the third switching tube is connected with the negative electrode of the first energy storage unit, and the source electrode of the third switching tube is connected with the negative electrode of the second energy storage unit and is connected to the ground;
the drain electrode of the fourth switching tube is connected with the anode of the first energy storage unit, and the source electrode of the fourth switching tube is connected with one end of the second winding.
The utility model discloses a theory of operation can combine specific embodiment to carry out detailed description at the back, and this is not repeated, when the energy storage unit is electric capacity, compare with prior art, the utility model discloses following beneficial effect has:
1. by controlling the on-off of the switch tube in the valley filling circuit, the total capacity of the energy storage unit connected into the main power circuit can be adjusted, the proper energy storage unit can be provided for input voltages in different voltage ranges, and the problem of uneven stress of the original scheme in high-voltage transient voltage is solved; the wide-voltage input or photovoltaic direct-current input device is suitable for alternating-current wide-voltage input or photovoltaic direct-current input occasions, the circuit cost is effectively reduced, and the reliability of the circuit is improved;
2. when the input voltage of the switching power supply is high voltage, the switching tube in the valley filling circuit is turned off, at the moment, the two energy storage units and the winding in the main power circuit are in a series working mode, the requirement on large-capacitance withstand voltage selection can be reduced, the cost is reduced, and meanwhile, as the large-capacitance capacity is reduced, the voltage is reduced more when the capacitance discharges, the conduction angle of a rectifier bridge can be increased, and the PF value under high-voltage input is improved;
3. when the input voltage of the switching power supply is low voltage, the switching tube in the valley filling circuit is switched on, the two energy storage units are in a parallel working mode at the moment, the capacity of the capacitor is increased, the instantaneous impact current of the starting machine can be reduced, the problem of large fluctuation of low-voltage output voltage is solved, the system size is reduced, and the cost is reduced.
Drawings
Fig. 1 is a connection diagram of a valley filling circuit and a main power circuit in a conventional switching power supply;
fig. 2 is a schematic diagram of a first embodiment of the switching power supply of the present invention;
fig. 3 is a schematic diagram of a second embodiment of the switching power supply of the present invention;
fig. 4 is a schematic diagram of a third embodiment of the switching power supply of the present invention;
fig. 5 is a schematic diagram of a fourth embodiment of the switching power supply of the present invention;
fig. 6 is a schematic diagram of a fifth embodiment of the switching power supply of the present invention.
Detailed Description
First embodiment
Fig. 2 is a schematic diagram of a first embodiment of the switching power supply of the present invention, the switching power supply includes: a main power circuit and a valley-fill circuit.
The main power circuit has a primary side circuit and a secondary side circuit (not shown), and the primary side circuit includes: the transformer comprises a first winding L1, a second winding L2, a first switch tube Q1 connected with the first winding L1 in series and a second switch tube Q2 connected with the second winding L2 in series.
The valley filling circuit is provided with a first energy storage unit C1, a second energy storage unit C2, a diode D1 and a third switching tube Q3, in this embodiment, the first energy storage unit C1 and the second energy storage unit C2 are capacitors with the same parameter, and hereinafter, the first energy storage unit C1 is simply referred to as a capacitor C1, and the second energy storage unit C2 is simply referred to as a capacitor C2; the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3 are MOS tubes respectively.
The positive electrode of the capacitor C1 is connected with the positive input end Vin + of the switching power supply, the positive electrode of the capacitor C1 is connected with the first end of the first winding L1, and the negative electrode of the capacitor C1 is respectively connected with the source of the first switching tube Q1, the anode of the diode D1 and the drain of the third switching tube Q3; the second end of the first winding L1 is connected with the drain electrode of the first switching tube Q1; the cathode of the diode D1 is connected with the anode of the capacitor C2 and the first end of the second winding L2, and the second end of the second winding L2 is connected with the drain electrode of the second switching tube Q2; the cathode of the capacitor C2 is connected to the source of the second switching tube Q2 and the source of the third switching tube Q3, respectively, and is grounded.
The working principle of the valley filling circuit in the embodiment is as follows:
when the voltage input from the positive input end Vin + of the switching power supply is high voltage, the first switching tube Q1 is controlled to be turned off, when the third switching tube Q3 is turned off, the diode D1 is turned on, the capacitor C1 and the capacitor C2 are charged in a series connection mode, the total capacitance value is reduced after the capacitor C1 and the capacitor C2 are connected in series, when the capacitor C1 and the capacitor C2 are connected in series and supply power to a rear stage, the voltage at two ends of the capacitor C1 can be reduced more, the conduction angle of the rectifier diode can be increased, the PF value under high-voltage input is improved, the first winding L1 is connected in series with the first switching tube Q1 at the moment and then connected in parallel with the capacitor C1, the second winding L2 is connected in series with the second switching tube Q2 at the moment and then connected in parallel with the capacitor C2, and in the working process of the switching power supply, the first switching tube Q1 and the second switching tube Q2 are equalized in voltage through the first inductor L1 and the second inductor L2 in a steady state; in addition, as the branch formed by connecting the first winding L1 and the first switching tube Q1 in series is connected with the capacitor C1 in parallel, the first switching tube Q1 can carry out voltage sharing through the capacitor C1 in the short-circuit process; similarly, since the branch formed by the second winding L2 and the second switching tube Q2 connected in series is connected in parallel with the capacitor C2, the second switching tube Q2 can perform voltage equalization through the capacitor C2 during the short circuit process.
When the voltage of positive input terminal Vin + input from switching power supply is the low pressure, third switch Q3 switches on this moment, diode D1 is in the off-state, electric capacity C1 charges, electric capacity C2 charges through the coupling of second inductance L2, at this moment, the electric capacity increases, electric capacity C1 and electric capacity C2 are when giving the first inductance L1 of back level and second inductance L2 respectively and supplying power, its both ends voltage can not lead to the big problem of output voltage fluctuation because of the capacity is not enough, can reduce impulse current simultaneously, the system volume is reduced, and the cost is saved.
Second embodiment
Fig. 3 is a schematic diagram of a switching power supply according to a second embodiment of the present invention, which is different from the first embodiment in that a third switch Q3 of the valley fill circuit in the switching power supply of this embodiment is controlled at a high side.
The valley filling circuit comprises a capacitor C1 (first energy storage unit), a capacitor C2 (second energy storage unit), a diode D1 and a third switching tube Q3. The positive electrode of a capacitor C1 (a first energy storage unit) is used for being connected with the positive input end of a switching power supply, the positive electrode of the capacitor C1 is connected with the first end of a first winding, the negative electrode of the capacitor C1 is connected with the source electrode of a first switching tube Q1 and the anode of a diode D1, the second end of the first winding L1 is connected with the drain electrode of the first switching tube Q1, the cathode of the diode D1 is respectively connected with the positive electrode of a capacitor C2 (a second energy storage unit), the source electrode of a third switching tube Q3 and the first end of a second winding L2, the second end of the second winding L2 is connected with the drain electrode of the second switching tube Q2, and the negative electrode of the capacitor C2 is connected with the source electrode of the second switching tube Q2 and is connected to the ground GND.
The difference between the operation principle of the valley filling circuit in the present embodiment and the first embodiment is: when the voltage input by the positive input end Vin + of the switching power supply is low voltage, the third switching tube Q3 is conducted, the capacitor C2 is charged, the capacitor C1 is charged through the coupling of the second inductor L2, and the first winding L1 and the second winding L2 are excited in parallel to provide energy for the rear stage.
Third embodiment
Fig. 4 is a schematic diagram of a switching power supply according to a third embodiment of the present invention, which is different from the first embodiment in that a fourth switching tube Q4 is further disposed in the valley filling circuit of the switching power supply according to this embodiment.
The valley filling circuit comprises a capacitor C1 (first energy storage unit), a capacitor C2 (second energy storage unit), a diode D1, a third switching tube Q3 and a fourth switching tube Q4. The third switching tube Q3 and the second switching tube Q2 are respectively an MOS tube, a relay, a triode, a thyristor or an IGBT; the first energy storage unit and the second energy storage unit are energy storage devices with the same parameters.
The positive electrode of the capacitor C1 is used for being connected with the positive input end of the switching power supply, the positive electrode of the capacitor C1 is respectively connected with the first end of the first winding L1 and the drain electrode of the fourth switching tube Q4, and the negative electrode of the capacitor C1 is respectively connected with the drain electrode of the third switching tube Q3, the source electrode of the first switching tube Q1 and the anode electrode of the diode D1; the second end of the first winding L1 is connected with the drain electrode of the first switching tube Q1; the cathode of the diode D1 is connected to the anode of the capacitor C2, the source of the fourth switching tube Q4 and the first end of the second winding L2, the second end of the second winding L2 is connected to the drain of the second switching tube Q2, and the source of the third switching tube Q3 is connected to the cathode of the capacitor C2 and the source of the second switching tube Q2 and connected to ground GND.
The difference between the operation principle of the valley filling circuit of the present embodiment and the first embodiment is: when the voltage input by the positive input end Vin + of the switching power supply is low voltage, the third switching tube Q3 and the fourth switching tube Q4 are conducted simultaneously, the capacitor C1 and the capacitor C2 are charged in parallel, and the first winding L1 and the second winding L2 are excited in parallel to provide energy for the rear stage.
Fourth embodiment
Referring to fig. 5, fig. 5 is a schematic diagram of a switching power supply according to a fourth embodiment of the present invention, in which the switching power supply of this embodiment includes a main power circuit and a valley filling circuit. The main power circuit is provided with a first winding L1, a second winding L2, a third winding L3, a first switching tube Q1, a second switching tube Q2 and a third switching tube Q3; the valley filling circuit is provided with a capacitor C1 (a first energy storage unit), a capacitor C2 (a second energy storage unit), a capacitor C3 (a third energy storage unit), a first diode D1, a second diode D2, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6 and a seventh switch tube Q7.
The positive electrode Vin + of the capacitor C1 is connected with the positive input end of the switching power supply, the positive electrode of the capacitor C1 is respectively connected with the first end of the first winding L1, the drain electrode of the fifth switching tube Q5 and the drain electrode of the seventh switching tube Q7, and the negative electrode of the capacitor C1 is connected with the drain electrode of the fourth switching tube Q4, the source electrode of the first switching tube Q1 and the anode of the first diode D1; the second end of the first winding L1 is connected with the drain electrode of the first switch tube Q1, and the cathode of the first diode D1 is respectively connected with the anode of the capacitor C2, the first end of the second winding L2 and the source stage of the fifth switch tube Q5; a second end of the second winding L2 is connected to a drain of the second switching tube Q2, and a negative electrode of the capacitor C2 is connected to an anode of the second diode D2, a source of the second switching tube Q2, and a drain of the sixth switching tube Q6; the cathode of the second diode D2 is connected to the anode of the capacitor C3, the source of the seventh switching tube Q7, and the first end of the third winding L3, the second end of the third winding L3 is connected to the drain of the third switching tube Q3, and the source of the third switching tube Q3 is connected to the cathode of the capacitor C3, the source of the sixth switching tube Q6, and the source of the fourth switching tube Q4, and is connected to ground.
The difference between the operating principle of the modified valley filling circuit of this embodiment and that of the second embodiment is: a third winding L3 and a third switching tube Q3 are added, when the voltage input by the switching power supply is low voltage, a fourth switching tube Q4, a fifth switching tube Q5, a sixth switching tube Q6 and a seventh switching tube Q7 are simultaneously conducted, and at the moment, a capacitor C1, a capacitor C2 and a capacitor C3 are in a parallel charging working state, which is the same as the embodiment; when the voltage input by the switching power supply is high voltage, the capacitor C1, the capacitor C2 and the capacitor C3 are connected in series, and the withstand voltage and the PF value are improved.
Fifth embodiment
Referring to fig. 6, fig. 6 is a schematic diagram of a fifth embodiment of the switching power supply of the present invention, compared with the third embodiment, the present embodiment performs stage expansion, and is provided with a multi-stage valley-filling circuit, and the main power circuit is additionally provided with a switching tube Qn, qn +1, a winding Ln, and a winding Ln +1; energy storage units Cn and Cn +1, diodes D2 and Dn, switching tubes Q5 and Q6, qn1 and Qn2 are added in the valley filling circuit, and the principle of the multi-stage valley filling circuit is the same as that of the third embodiment and the fourth embodiment.
The above are only embodiments of the present invention, and it should be especially noted that the above embodiments should not be considered as limitations of the present invention, and for those skilled in the art, a plurality of modifications and decorations can be made without departing from the spirit and scope of the present invention, and these modifications and decorations should also be considered as protection scope of the present invention.
Claims (9)
1. A switching power supply, comprising: the main power circuit is provided with a first winding, a second winding, a first switch tube and a second switch tube; it is characterized in that the preparation method is characterized in that,
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a diode and a third switching tube;
the anode of the first energy storage unit is used for being connected with the positive input end of the switching power supply, the anode of the first energy storage unit is connected with the first end of the first winding, and the cathode of the first energy storage unit is respectively connected with the source of the first switching tube, the anode of the diode and the drain of the third switching tube; the second end of the first winding is connected with the drain electrode of the first switching tube; the cathode of the diode is connected with the anode of the second energy storage unit and the first end of the second winding, and the second end of the second winding is connected with the drain electrode of the second switching tube; and the cathode of the second energy storage unit is respectively connected with the source stage of the second switching tube and the source stage of the third switching tube and is connected to the ground.
2. A switching power supply, comprising: a main power circuit and a valley filling circuit, wherein the main power circuit has a first winding, a second winding, a first switch tube and a second switch tube,
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a diode and a third switching tube;
the positive electrode of the first energy storage unit is used for being connected with the positive input end of the switching power supply, the positive electrode of the first energy storage unit is connected with the first end of the first winding, the negative electrode of the first energy storage unit is connected with the source level of the first switching tube and the positive electrode of the diode, the second end of the first winding is connected with the drain electrode of the first switching tube, the negative electrode of the diode is respectively connected with the positive electrode of the second energy storage unit, the source level of the third switching tube and the first end of the second winding, the second end of the second winding is connected with the drain electrode of the second switching tube, and the negative electrode of the second energy storage unit is connected with the source level of the second switching tube and is connected to the ground.
3. The switching power supply according to any one of claims 1 to 2, wherein the third switching tube is a MOS tube, a relay, a triode, a thyristor or an IGBT; the first energy storage unit and the second energy storage unit are energy storage devices with consistent parameters.
4. A switching power supply, comprising: a main power circuit and a valley filling circuit, wherein the main power circuit has a first winding, a second winding, a first switch tube and a second switch tube,
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a diode, a third switching tube and a fourth switching tube;
the positive electrode of the first energy storage unit is used for being connected with the positive input end of the switching power supply, the positive electrode of the first energy storage unit is respectively connected with the first end of the first winding and the drain electrode of the fourth switching tube, and the negative electrode of the first energy storage unit is respectively connected with the drain electrode of the third switching tube, the source electrode of the first switching tube and the anode of the diode; the second end of the first winding is connected with the drain electrode of the first switching tube, the cathode of the diode is respectively connected with the anode of the second energy storage unit, the source electrode of the fourth switching tube and the first end of the second winding, the second end of the second winding is connected with the drain electrode of the second switching tube, and the source electrode of the third switching tube is respectively connected with the cathode of the second energy storage unit and the source electrode of the second switching tube and is connected to the ground.
5. The switching power supply according to claim 4, wherein when the switching power supply is operated, the third switching tube and the second switching tube are simultaneously turned on and off.
6. The switching power supply according to claim 4, wherein the third switching tube and the second switching tube are respectively a MOS tube, a relay, a triode, a thyristor or an IGBT; the first energy storage unit and the second energy storage unit are energy storage devices with the same parameters.
7. A valley fill circuit for use in a switching power supply having a main power circuit with a first winding, a second winding, a first switching tube connected in series with the first winding, and a second switching tube connected in series with the second winding,
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a diode, a third switching tube and a fourth switching tube;
the first energy storage unit is connected in parallel at two ends of a series branch composed of the first winding and the first switching tube, and the anode of the first energy storage unit is used for being connected with the positive input end of the switching power supply;
the second energy storage unit is connected in parallel at two ends of a series branch consisting of the second winding and the second switching tube;
the anode of the diode is connected with the cathode of the first energy storage unit, and the cathode of the diode is connected with one end of the second winding and the anode of the second energy storage unit;
the drain electrode of the third switching tube is connected with the negative electrode of the first energy storage unit, and the source electrode of the third switching tube is connected with the negative electrode of the second energy storage unit and is connected to the ground;
the drain electrode of the fourth switching tube is connected with the anode of the first energy storage unit, and the source electrode of the fourth switching tube is connected with one end of the second winding.
8. A switching power supply, comprising: a main power circuit and a valley filling circuit, wherein the main power circuit comprises a first winding, a second winding, a third winding, a first switch tube, a second switch tube and a third switch tube,
the valley filling circuit is provided with a first energy storage unit, a second energy storage unit, a third energy storage unit, a first diode, a second diode, a fourth switching tube, a fifth switching tube, a sixth switching tube and a seventh switching tube;
the positive electrode of the first energy storage unit is used for being connected with the positive input end of the switching power supply, the positive electrode of the first energy storage unit is respectively connected with the first end of the first winding, the drain electrode of the fifth switching tube and the drain electrode of the seventh switching tube, and the negative electrode of the first energy storage unit is connected with the drain electrode of the fourth switching tube, the source electrode of the first switching tube and the anode of the first diode;
the second end of the first winding is connected with the drain electrode of the first switching tube, and the cathode of the first diode is respectively connected with the anode of the second energy storage unit, the first end of the second winding and the source electrode of the fifth switching tube;
the second end of the second winding is connected with the drain electrode of the second switching tube, and the cathode of the second energy storage unit is respectively connected with the anode of the second diode, the source of the second switching tube and the drain electrode of the sixth switching tube;
the cathode of the second diode is connected with the anode of the third energy storage unit, the source of the seventh switching tube and the first end of the third winding, the second end of the third winding is connected with the drain of the third switching tube, and the source of the third switching tube is connected with the cathode of the third energy storage unit, the source of the sixth switching tube and the source of the fourth switching tube and connected to the ground.
9. The switching power supply according to claim 8, wherein a further valley-fill circuit is provided in parallel with the valley-fill circuit.
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| CN202123203116.XU CN217590607U (en) | 2021-12-20 | 2021-12-20 | Switching power supply and valley filling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123203116.XU CN217590607U (en) | 2021-12-20 | 2021-12-20 | Switching power supply and valley filling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114337250A (en) * | 2021-12-20 | 2022-04-12 | 广州金升阳科技有限公司 | Switching power supply and valley filling circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114337250A (en) * | 2021-12-20 | 2022-04-12 | 广州金升阳科技有限公司 | Switching power supply and valley filling circuit |
| CN114337250B (en) * | 2021-12-20 | 2024-06-18 | 广州金升阳科技有限公司 | Switching power supply and valley filling circuit |
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