CN113328616A - Valley filling circuit - Google Patents
Valley filling circuit Download PDFInfo
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- CN113328616A CN113328616A CN202110482342.1A CN202110482342A CN113328616A CN 113328616 A CN113328616 A CN 113328616A CN 202110482342 A CN202110482342 A CN 202110482342A CN 113328616 A CN113328616 A CN 113328616A
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- 238000004146 energy storage Methods 0.000 claims abstract description 124
- 239000003990 capacitor Substances 0.000 claims abstract description 102
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 15
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an improved valley filling circuit, which is additionally provided with two switches on the basis of the existing valley filling circuit, wherein the two switches comprise a first energy storage unit, a second energy storage unit, a first diode, a second diode, a third diode, a first switch and a second switch, and can be applied to the field of rectification and filtering of wide voltage input. When the energy storage unit is a capacitor, the circuit can provide proper filtering capacity for input voltages in different ranges, can improve the PF value in high-voltage input and solve the problems of large fluctuation and impact current of large capacitor output voltage in low-voltage input, and simultaneously reduces the system volume and the cost.
Description
Technical Field
The invention relates to the technical field of rectification and filtering, in particular to a valley filling circuit suitable for wide voltage input.
Background
Alternating current of various power grids is often required to be rectified into direct current in industrial and civil fields, and 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 the requirement of wide-range input voltage, so that not only is the power supply design difficult, but also the model selection specification of passive devices in a circuit is increased, the size and the weight of the circuit are increased, and meanwhile, higher cost pressure is brought. The input part of the switching power supply is usually composed of a bridge rectifier circuit and a large filter capacitor, both of which are nonlinear devices, due to the existence of the large-capacity capacitor, the conduction angle of a diode in the bridge rectifier circuit becomes very narrow, the diode is only conducted at the peak value part of the alternating voltage input, so that the alternating current input current is seriously distorted and becomes spike pulse, the current waveform contains a large amount of harmonic components, which not only can affect the power grid, but also can greatly reduce the active power and the power factor, in order to improve the power factor of the switching power supply, the existing switching power supply is usually provided with a power factor correction circuit, the existing power factor correction circuit is composed of the bridge rectifier circuit and a post-stage valley filling circuit, the traditional valley filling circuit is shown in figure 1, and the valley filling circuit has the characteristics of series charging and parallel discharging, when the bus voltage is higher than the voltage of the large capacitor behind the bridge rectifier circuit, the capacitor is charged through the large-capacity capacitor C1 and the capacitor C2 which are connected in series, and when the bus voltage is lower than the voltage of the large capacitor behind the rectifier circuit, the two capacitors are connected in parallel to discharge electricity to a load. However, this circuit has the disadvantage that when the bus voltage is input at a low voltage, the capacitance of the large capacitor is reduced due to the series charging mode of the two capacitors, so that a large inrush current occurs at the moment of start-up, and the circuit has a problem of large fluctuation of the output voltage when the low voltage is input.
Disclosure of Invention
In view of the above, the present invention provides a valley filling circuit to solve the problems of low power factor value at high voltage input and large fluctuation of output voltage and surge current at low voltage input.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the first technical scheme is that the valley filling circuit is applied to a switching power supply under a wide voltage input range and comprises the following components: the energy storage device comprises a first energy storage unit, a second energy storage unit, a first diode, a second diode, a third diode and a switch;
the first end of the first energy storage unit is connected with the input port and the cathode of the third diode, the second end of the first energy storage unit is connected with the cathode of the first diode and the anode of the second switch tube, the anode of the first diode is connected with the ground, the switch is connected with the first diode in parallel, the cathode of the second diode is connected with the anode of the third diode and the first end of the second energy storage unit, the second end of the second energy storage unit is connected with the anode of the first diode and the ground, and the cathode of the third diode is connected with the output port.
The second technical scheme is that the valley filling circuit is applied to a switching power supply in a wide voltage input range and comprises the following components: the energy storage device comprises a first energy storage unit, a second energy storage unit, a first diode, a second diode, a third diode and a switch;
the first end of the first energy storage unit is connected with the input port and the cathode of the third diode, the second end of the first energy storage unit is connected with the cathode of the first diode and the anode of the second switch tube, the anode of the first diode is connected with the ground, the cathode of the second diode is connected with the anode of the third diode and the first end of the second energy storage unit, the switch and the third diode are connected in parallel, the second end of the second energy storage unit is connected with the anode of the first diode and the input ground, and the cathode of the third diode is connected with the output port.
The third technical scheme is that the valley filling circuit is applied to a switching power supply in a wide voltage input range and comprises the following components: the energy storage device comprises a first energy storage unit, a second energy storage unit, a first diode, a second diode, a third diode, a first switch and a second switch;
the first end of the first energy storage unit is connected with the input port and the cathode of the third diode, the second end of the first energy storage unit is connected with the cathode of the first diode and the anode of the second switch tube, the anode of the first diode is connected with the ground, the first switch is connected with the first diode in parallel, the cathode of the second diode is connected with the anode of the third diode and the first end of the second energy storage unit, the second end of the second energy storage unit capacitor is connected with the anode of the first diode and the ground, the second switch is connected with the third diode in parallel, and the cathode of the third diode is connected with the output port.
Wherein the first switch (S1) and the second switch (S2) are simultaneously turned on and off, or only the first switch (S1) is turned on, the second switch (S2) is not turned on, or only the second switch (S2) is turned on, and the first switch (S1) is not turned on.
The fourth technical scheme is that the valley filling circuit is applied to a switching power supply under a wide-voltage input range and comprises the following components: the energy storage device comprises a first energy storage unit, a second energy storage unit, a switching tube, a first diode and a second diode;
the first end of the first energy storage unit is connected with the input port and the cathode of the second diode, the second end of the first energy storage unit is connected with the drain electrode of the switch tube and the anode of the first switch tube, the source electrode of the switch tube is connected with the ground, the cathode of the first diode is connected with the anode of the second diode and the first end of the second energy storage unit, the second end of the second energy storage unit is connected with the source electrode of the first switch tube and the ground, and the cathode of the second diode is connected with the output port.
In a fifth technical solution, a valley fill circuit applied to a switching power supply in a wide voltage input range includes: the energy storage device comprises a first energy storage unit, a second energy storage unit, a switching tube, a first diode and a second diode;
the first end of the first energy storage unit is connected with the input port and the drain electrode of the first switch tube, the second end of the first energy storage unit is connected with the cathode of the first diode and the anode of the second switch tube, the anode of the first diode is connected with the ground, the cathode of the second diode is connected with the source electrode of the first switch tube and the first end of the second energy storage unit, the second end of the second energy storage unit is connected with the anode of the first diode and the ground, and the drain electrode of the first switch tube is connected with the output port.
A sixth technical solution, a valley fill circuit, applied to a switching power supply in a wide voltage input range, includes: the energy storage device comprises a first energy storage unit, a second energy storage unit, a first switch tube, a second switch tube and a first diode;
the first end of the first energy storage unit is connected with the input port and the drain electrode of the second switch tube, the second end of the first energy storage unit is connected with the drain electrode of the first switch tube and the anode of the first switch tube, the source electrode of the first switch tube is connected with the ground, the cathode of the first diode is connected with the source electrode of the second switch tube and the first end of the second energy storage unit, the second end of the second energy storage unit is connected with the source electrode of the first switch tube and the ground, and the drain electrode of the second switch tube is connected with the output port.
A seventh technical solution, a valley fill circuit, applied to a switching power supply in a wide voltage input range, includes: the energy storage device comprises a first energy storage unit, a second energy storage unit, a third energy storage unit, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first switch, a second switch, a third switch and a fourth switch;
the first end of the first energy storage unit is connected with the input port and the cathode of the third diode, the second end of the first energy storage unit is connected with the anode of the second diode and the cathode of the first diode, the anode of the first diode is connected with the anode of the fourth diode and the ground, the first switch tube is connected in parallel with the two ends of the first diode, the cathode of the second diode is connected with the anode of the third diode and the first end of the second energy storage unit, the second end of the second energy storage unit is connected with the anode of the fifth diode and the cathode of the fourth diode, the second switch is connected in parallel with the two ends of the third diode, the third switch is connected in parallel with the two ends of the fourth diode, the cathode of the fifth diode is connected with the anode of the sixth diode and the first end of the third energy storage unit, the second end of the third energy storage unit is connected with the anode (D4) of the fourth diode and the ground, the fourth switch is connected in parallel with the two ends of the sixth diode, and the cathode of the sixth diode is connected with the output port.
The working principle of the present invention will be described in detail later with reference to specific embodiments, which are not described herein, and when the energy storage unit is a capacitor, compared with the prior art, the present invention has the following beneficial effects:
(1) the total capacitance of the capacitor in the valley filling circuit can be adjusted by controlling the on and off of the switch, so that the proper capacitance can be provided for input voltages in different voltage ranges, the circuit is suitable for wide-voltage input of alternating current or photovoltaic direct current input occasions, and the circuit cost is effectively reduced;
(2) the switch is turned off when the bus voltage is high-voltage input, the two capacitors are in a series working mode at the moment, the requirement on withstand voltage selection of the large capacitors can be reduced, the cost is reduced, and meanwhile, the capacitance of the large capacitors is reduced, so that the voltage of the capacitors is reduced more during discharge, the conduction angle of a rectifier diode of the bridge rectifier circuit can be increased, and the power factor value of the switching power supply under high-voltage input is improved;
(3) when the bus voltage is in a low-voltage input state, the switch is switched on, the two capacitors are in a parallel charging working mode at the moment, the capacity of the capacitors is increased, the instantaneous impact current of the starting machine can be reduced, the problem of large fluctuation of the output voltage of the low-voltage switch power supply is solved, the system size is reduced, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional valley-fill circuit;
FIG. 2 is a schematic diagram of a first embodiment of a valley filling circuit of the present invention;
FIG. 3 is a schematic diagram of a second embodiment of the valley fill circuit of the present invention;
FIG. 4 is a schematic diagram of a third embodiment of a valley fill circuit of the present invention;
FIG. 5 is a schematic diagram of a fourth embodiment of a valley fill circuit of the present invention;
FIG. 6 is a schematic diagram of a fifth embodiment of the valley fill circuit of the present invention;
FIG. 7 is a schematic diagram of a sixth embodiment of a valley fill circuit of the present invention;
fig. 8 is a schematic diagram of a valley fill circuit according to a sixth embodiment of the present invention.
Detailed Description
First embodiment
Fig. 2 is a schematic diagram of a first embodiment of a valley filling circuit according to the present invention, the valley filling circuit is applied to a switching power supply under a wide voltage input range, and includes a first energy storage unit C1, a second energy storage unit C2, a first diode D1, a second diode D2, a third diode D3 and a switch S1, in this embodiment, the first energy storage unit C1 and the second energy storage unit C2 are capacitors, respectively, wherein the first energy storage unit C1 is defined as a first capacitor C1, the second energy storage unit C2 is defined as a second capacitor C2, and the capacitance values of the first capacitor C1 and the second capacitor C2 are the same; the switch S1 is MOS tube, relay, triode, thyristor or IGBT. In other embodiments, the first energy storage unit C1 and the second energy storage unit C2 may be inductors.
A first end of the first capacitor C1 is connected to the input port VIN and the cathode of the third diode D3, a second end of the first capacitor C1 is connected to the cathode of the first diode D1 and the anode of the second switching tube D2, and the anode of the first diode D1 is connected to ground; the switch tube S1 is connected in parallel with the first diode D1, the cathode of the second diode D2 is connected to the anode of the third diode D3 and the first end of the second capacitor C2, the second end of the second capacitor C2 is connected to the anode of the first diode D1 and the ground, and the cathode of the third diode D3 is connected to the output port VOUT.
The working principle of the valley filling circuit in the embodiment is as follows: when the bus voltage is input at a high voltage, the switch S1 is in an off state, the first diode D1 and the third diode D3 are in an off state, the second diode D2 is turned on, and the first capacitor C1 and the second capacitor C2 are charged in a series connection manner, at this time, the total capacitance value of the first capacitor C1 and the second capacitor C2 is reduced, when the first capacitor C1 and the second capacitor C2 supply power to a rear stage, the voltage between the first end of the first capacitor C1 and the second end of the second capacitor C2 is reduced more, so that the conduction angle of the rectifier diode arranged in the front bridge rectifier circuit of the valley filling circuit (i.e., the conduction duration of the rectifier diode at the stage) can be increased, and further, under the high voltage input, the power factor value of the switching power supply for the valley filling circuit is improved; when the bus voltage is input at low voltage, the switch S1 is turned on, the first diode D1, the second diode D2 and the third diode D3 are all in a cut-off state, the first capacitor C1 is charged, the capacity of the first capacitor C1 is increased, and when the first capacitor C1 supplies power to the rear stage, the voltage at two ends of the first capacitor C1 cannot cause the problem of large fluctuation of the output voltage due to insufficient capacity, so that the impact current can be reduced, the system size is reduced, and the cost is saved.
Second embodiment
Fig. 3 is a schematic diagram of a valley filling circuit according to a second embodiment of the present invention, which is different from the first embodiment in that: the valley filling circuit in this embodiment connects the switch S1 in parallel across the diode D3, and the first capacitor C1, the second capacitor C2, the first diode D1, the second diode D2, the third diode D3, and the switch S1 are connected as follows:
the input port VIN is connected to a first end of the first capacitor C1, a first end of the first capacitor C1 is connected to a cathode of the third diode D3, a second end of the first capacitor C1 is connected to a cathode of the first diode D1 and an anode of the second switching tube D2, a second end of the first diode D1 is connected to the input ground, a cathode of the second diode D2 is connected to an anode of the third diode D3 and a first end of the second energy storage unit C2, the switch S1 is connected in parallel to the third diode D3, a second end of the second energy storage unit C2 is connected to an anode of the first diode D1 and the input ground, and a cathode of the third diode D3 is connected to the output port VOUT.
The difference between the operation principle of the valley filling circuit in this embodiment and the first embodiment is: when the bus voltage is input at a low voltage, the switch S1 is turned on, the second capacitor C2 starts to charge, the capacity of the second capacitor C2 increases, and the second capacitor C2 discharges to supply power to the subsequent stage. The valley-fill circuit in this embodiment also achieves the same function as in the first embodiment and will not be described here.
Third embodiment
As shown in fig. 4, a schematic diagram of a third embodiment of the valley fill circuit of the present invention is different from the first embodiment in that: the valley filling circuit in this embodiment is provided with a first switch S1 and a second switch S2, and the first capacitor C1, the second capacitor C2, the first diode D1, the second diode D2, the third diode D3, the first switch S1, and the second switch S2 are connected as follows:
the input port VIN is connected to a first end of a first capacitor C1, a first end of the first capacitor C1 is connected to a cathode of a third diode D3, a second end of the first capacitor C1 is connected to a cathode of the first diode D1 and an anode of the second switch tube D2, an anode of the first diode D1 is connected to ground, the first switch tube S1 is connected in parallel to the first diode D1, a cathode of the second diode D2 is connected to an anode of the third diode D3 and a first end of the second capacitor C2, a second end of the second capacitor C2 is connected to an anode of the first diode D1 and ground, the second switch tube S2 is connected in parallel to the third diode D3, and a cathode of the third diode D3 is connected to the output port VOUT.
The difference between the operation principle of the valley filling circuit in this embodiment and the first embodiment is: the second switch S2 is added, and its main purpose is to turn on the first switch S1 and the second switch S2 at the same time when the bus voltage is input with low voltage, at this time, the first capacitor C1 and the second capacitor C2 are in parallel charging working state, after the first capacitor C1 and the capacitor C2 are connected in parallel, the total capacitance value will be further increased, the impact current at the moment of starting the machine will become smaller, and when the voltage of the first capacitor C1 and the capacitor C2 supplies power to the rear stage, the fluctuation of the output voltage will become smaller.
Fourth embodiment
As shown in fig. 5, a schematic diagram of a fourth embodiment of the valley fill circuit of the present invention is different from the first embodiment in that: the valley filling circuit in this embodiment removes the switch S1 and the diode D1 in the first embodiment, and adds a switch Q1, and the switch Q1 is a MOS transistor provided with a body diode. The valley filling circuit in this embodiment is composed of a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2 and a switch tube Q1, and the connection relationship is as follows:
the input port VIN is connected to a first end of the first capacitor C1, a first end of the first capacitor C1 is connected to a cathode of the second diode D2, a second end of the first capacitor C1 is connected to a drain of the switch Q1 and an anode of the switch D1, a source of the first switch Q1 is connected to the input ground, a cathode of the first diode D1 is connected to an anode of the second diode D2 and a first end of the second capacitor C2, a second end of the second capacitor C2 is connected to a source of the switch Q1 and the ground, and a cathode of the second diode D2 is connected to the output port VOUT.
The working principle of the valley filling circuit in the embodiment is as follows:
when the bus voltage is input at a high voltage, the switching tube Q1 is in an off state, the first diode D1 is in an on state, the second diode D2 is in an off state, and the first capacitor C1 and the second capacitor C2 are charged in a series connection mode; when the bus voltage is input at a low voltage, the switching tube Q1 is turned on, the first diode D1 and the second diode D2 are both in an off state, and the first capacitor C1 is charged.
In this embodiment, the switch S1 and the diode D1 are removed and replaced with the switching tube Q1, so that the first capacitor C1 can freewheel through the body diode of the switching tube Q1 when discharging in a low-power situation, which is beneficial to reducing the number of components and reducing the system volume.
Fifth embodiment
As shown in fig. 6, a schematic diagram of a fifth embodiment of the valley fill circuit of the present invention is different from the first embodiment in that: in this embodiment, the switch S1 and the diode D3 in the first embodiment are removed, and the switching tube Q1 is newly added. The valley filling circuit in this embodiment is composed of a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2 and a switch tube Q1, and the connection relationship is as follows:
the input port VIN is connected with a first end of a first capacitor C1, a first end of a first capacitor C1 is connected with a drain electrode of a switch tube Q1, a second end of the first capacitor C1 is connected with a cathode of a first diode D1 and an anode of a second switch tube D2, an anode of the first diode D1 is connected with the ground, a cathode of a second diode D2 is connected with a source electrode of the first switch tube Q1 and a first end of a second capacitor C2, a second end of the second capacitor C2 is connected with an anode of the first diode D1 and the ground, and a drain electrode of the switch tube Q1 is connected with the output port VOUT.
The difference between the operation principle of the valley filling circuit in this embodiment and the first embodiment is: after the switch S1 and the diode D3 are removed, the switch tube Q1 is used for replacing the switch tube, so that the switch tube Q1 can be used for follow current through the body diode of the switch tube Q1 when the second capacitor C2 discharges in a low-power occasion, and therefore the number of components and parts is reduced, and the volume of a system is reduced.
Sixth embodiment
As shown in fig. 7, a schematic diagram of a sixth embodiment of the valley fill circuit of the present invention is different from the third embodiment in that: in this embodiment, the first switch S1, the second switch S2, the first diode D1, and the third diode D3 in the third embodiment are removed, and a first switch Q1 and a second switch Q2 are added. The valley filling circuit in this embodiment is composed of a first capacitor C1, a second capacitor C2, a first diode D1, a first switch tube Q1 and a second switch tube Q2, and the connection relationship is as follows:
the input port VIN is connected to a first end of a first capacitor C1, a first end of the first capacitor C1 is connected to a drain of the second switch Q2, a second end of the first capacitor C1 is connected to a drain of the first switch Q1 and an anode of the first diode D1, a source of the first switch Q1 is connected to ground, a cathode of the first diode D1 is connected to a source of the second switch Q2 and a first end of the second capacitor C2, a second end of the second capacitor C2 is connected to a source of the first switch Q1 and ground, and a drain of the second switch Q2 is connected to the output port VOUT.
The difference between the operation principle of the valley filling circuit of this embodiment and the third embodiment is: the first switch S1, the second switch S2, the first diode D1 and the third diode D3 in the third embodiment are removed and replaced by the first switch tube Q1 and the second switch tube Q2, so that the freewheeling can be performed through the body diodes of the first switch tube Q1 and the second switch tube Q2 when the first capacitor C1 and the second capacitor C2 are discharged in a low-power situation, and the number of components and the cost are further reduced.
Seventh embodiment
As shown in fig. 8, a schematic diagram of a seventh embodiment of the valley fill circuit of the present invention is different from the third embodiment in that: a fourth diode D4, a fifth diode D5, a sixth diode D6, a third switch S3, a fourth switch S4 and a third capacitor C3.
An input port VIN is connected to a first end of a first capacitor C1, a first end of the first capacitor C1 is connected to a cathode of a third diode D3 and an anode of a sixth diode D6, a second end of the first capacitor C1 is connected to an anode of a second diode D2 and a cathode of a first diode D1, an anode of a first diode D1 is connected to an anode of a fourth diode D4 and ground, a first switch S1 is connected in parallel to both ends of the first diode D1, a cathode of a second diode D2 is connected to an anode of a third diode D3 and a first end of a second capacitor C2, a second end of a second capacitor C2 is connected to an anode of a fifth diode D5 and a cathode of a fourth diode D53, a second switch S2 is connected in parallel to both ends of a third diode D3, a third switch S3 is connected in parallel to both ends of the fourth diode D4, a cathode of the fifth diode D5 is connected to an anode of the sixth diode D5 and a cathode of the third diode D8472, a first end of the third diode C5 and a ground, the fourth switch S4 is connected in parallel to two ends of the sixth diode D6, and the cathode of the sixth diode is connected to the output terminal VOUT.
The difference between the valley fill circuit principle in this embodiment and the third embodiment is: after the fourth diode D4, the fifth diode D5, the sixth diode D6, the third switch S3, the fourth switch S4 and the third capacitor C3 are added, the capacitance of the capacitor in the access circuit is changed by controlling the on and off of the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4, so that the control mode is more flexible.
The above are only embodiments of the present invention, and it should be particularly noted that the above embodiments should not be construed as limiting the present invention, and it will be apparent to those skilled in the art that several 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 regarded as the protection scope of the present invention.
Claims (10)
1. A valley filling circuit applied to a switching power supply under a wide voltage input range is characterized by comprising: a first energy storage unit (C1), a second energy storage unit (C2), a first diode (D1), a second diode (D2), a third diode (D3), and a switch (S1);
the first end of the first energy storage unit C1 is connected with the input port (VIN) and the cathode of the third diode (D3), the second end of the first energy storage unit (C1) is connected with the cathode of the first diode (D1) and the anode of the second switching tube (D2), the anode of the first diode (D1) is connected with the ground, the switch (S1) is connected with the first diode (D1) in parallel, the cathode of the second diode (D2) is connected with the anode of the third diode (D3) and the first end of the second energy storage unit (C2), the second end of the second energy storage unit (C2) is connected with the anode of the first diode (D1) and the ground, and the cathode of the third diode (D3) is connected with the output port (VOUT).
2. A valley filling circuit applied to a switching power supply under a wide voltage input range is characterized by comprising: a first energy storage unit (C1), a second energy storage unit (C2), a first diode (D1), a second diode (D2), a third diode (D3), and a switch (S1);
the first end of the first energy storage unit (C1) is connected with the input port (VIN) and the cathode of the third diode (D3), the second end of the first energy storage unit (C1) is connected with the cathode of the first diode (D1) and the anode of the second switching tube (D2), the anode of the first diode (D1) is connected with the ground, the cathode of the second diode (D2) is connected with the anode of the third diode (D3) and the first end of the second energy storage unit (C2), the switch (S1) is connected with the third diode (D3) in parallel, the second end of the second energy storage unit (C2) is connected with the anode of the first diode (D1) and the ground, and the cathode of the third diode (D3) is connected with the output port (VOUT).
3. The improved valley fill circuit of any of claims 1-2, wherein: the switch (S1) is MOS tube, relay, triode, thyristor or IGBT; the first energy storage unit C1 and the second energy storage unit C2 are capacitors or inductors, and when the first energy storage unit C1 and the second energy storage unit C2 are capacitors, the capacitance values of the first energy storage unit C1 and the second energy storage unit C2 are the same; when the first energy storage unit C1 and the second energy storage unit C2 are inductors, the inductance of the first energy storage unit C1 and the inductance of the second energy storage unit C2 are the same.
4. A valley filling circuit applied to a switching power supply under a wide voltage input range is characterized by comprising: a first energy storage unit (C1), a second energy storage unit (C2), a first diode (D1), a second diode (D2), a third diode (D3), a first switch (S1) and a second switch (S2);
the first end of the first energy storage unit (C1) is connected with the input port (VIN) and the cathode of the third diode (D3), the second end of the first energy storage unit (C1) is connected with the cathode of the first diode (D1) and the anode of the second switching tube (D2), the anode of the first diode (D1) is connected with the ground, the first switch (S1) is connected with the first diode (D1) in parallel, the cathode of the second diode (D2) is connected with the anode of the third diode (D3) and the first end of the second energy storage unit (C2), the second end of the second energy storage unit capacitor (C2) is connected with the anode of the first diode (D1) and the ground, the second switch (S2) is connected with the third diode (D3) in parallel, and the cathode of the third diode (D3) is connected with the output port (VOUT).
5. The improved valley fill circuit of claim 4, wherein: the first switch (S1) and the second switch (S2) are turned on and off simultaneously, or only the first switch (S1) is turned on, the second switch (S2) is not turned on, or only the second switch (S2) is turned on, and the first switch (S1) is not turned on.
6. A valley filling circuit applied to a switching power supply under a wide voltage input range is characterized by comprising: the energy storage device comprises a first energy storage unit (C1), a second energy storage unit (C2), a switching tube (Q1), a first diode (D1) and a second diode (D2);
the first end of the first energy storage unit (C1) is connected with the input port (VIN) and the cathode of the second diode (D2), the second end of the first energy storage unit (C1) is connected with the drain of the switch tube (Q1) and the anode of the first switch tube (D1), the source of the switch tube (Q1) is connected with the ground, the cathode of the first diode (D1) is connected with the anode of the second diode (D2) and the first end of the second energy storage unit (C2), the second end of the second energy storage unit (C2) is connected with the source of the switch tube (Q1) and the ground, and the cathode of the second diode (D2) is connected with the output port (VOUT).
7. A valley filling circuit applied to a switching power supply under a wide voltage input range is characterized by comprising: the energy storage device comprises a first energy storage unit (C1), a second energy storage unit (C2), a switching tube (Q1), a first diode (D1) and a second diode (D2);
the first end of the first energy storage unit (C1) is connected with the input port (VIN) and the drain of the first switch tube (Q1), the second end of the first energy storage unit (C1) is connected with the cathode of the first secondary tube (D1) and the anode of the second switch tube (D2), the anode of the first secondary tube (D1) is connected with the ground, the cathode of the second diode (D2) is connected with the source of the first switch tube (Q1) and the first end of the second energy storage unit (C2), the second end of the second energy storage unit (C2) is connected with the anode of the first secondary tube (D1) and the ground, and the drain of the first switch tube (Q1) is connected with the output port (VOUT).
8. An improved valley fill circuit according to any of claims 6 to 7, wherein: the switching tube (Q1) is a MOS tube provided with a body diode.
9. A valley filling circuit applied to a switching power supply under a wide voltage input range is characterized by comprising: the energy storage device comprises a first energy storage unit (C1), a second energy storage unit (C2), a first switching tube (Q1), a second switching tube (Q2) and a first diode D1;
the first end of the first energy storage unit (C1) is connected with the input port (VIN) and the drain of the second switch tube (Q2), the second end of the first energy storage unit (C1) is connected with the drain of the first switch tube (Q1) and the anode of the first switch tube (D1), the source of the first switch tube (Q1) is connected with the ground, the cathode of the first diode (D1) is connected with the source of the second switch tube (Q2) and the first end of the second energy storage unit (C2), the second end of the second energy storage unit (C2) is connected with the source of the first switch tube (Q1) and the ground, and the drain of the second switch tube (Q2) is connected with the output port (VOUT).
10. A valley filling circuit applied to a switching power supply under a wide voltage input range is characterized by comprising: a first energy storage unit (C1), a second energy storage unit (C2), a third energy storage unit (C3), a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), a fifth diode (D5), a sixth diode (D6), a first switch (S1), a second switch (S2), a third switch (S3), and a fourth switch (S4);
a first end of the first energy storage unit (C1) is connected with the input port (VIN) and a cathode of the third diode (D3) and a cathode (D6) of the sixth diode, a second end of the first energy storage unit (C1) is connected with an anode of the second diode (D2) and a cathode of the first diode (D1), an anode of the first diode (D1) is connected with an anode of the fourth diode (D4) and ground, the first switching tube (S1) is connected in parallel with two ends of the first diode (D1), a cathode of the second diode (D2) is connected with an anode of the third diode (D3) and a first end of the second energy storage unit (C2), a second end of the second energy storage unit (C2) is connected with an anode of the fifth diode (D5) and a cathode of the fourth diode (D4), the second switch (S2) is connected in parallel with two ends of the third diode (D3), and a third switch (S3) is connected in parallel with two ends of the fourth diode (D4), the cathode of the fifth diode (D5) is connected with the anode of the sixth diode (D6) and the first end of the third energy storage unit (C3), the second end of the third energy storage unit (C3) is connected with the anode (D4) of the fourth diode and the ground, the fourth switch (S4) is connected in parallel with two ends of the sixth diode (D6), and the cathode of the sixth diode (D6) is connected with the output port (VOUT).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110482342.1A CN113328616A (en) | 2021-04-30 | 2021-04-30 | Valley filling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110482342.1A CN113328616A (en) | 2021-04-30 | 2021-04-30 | Valley filling circuit |
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| CN113328616A true CN113328616A (en) | 2021-08-31 |
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| CN202110482342.1A Pending CN113328616A (en) | 2021-04-30 | 2021-04-30 | Valley filling circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN114336857A (en) * | 2021-12-30 | 2022-04-12 | 深圳市沃特沃德信息有限公司 | Conversion circuit for series charging and parallel power supply |
| CN116054361A (en) * | 2023-03-30 | 2023-05-02 | 浙江大学杭州国际科创中心 | Method for reducing bus capacitor volume and mobile power supply |
| WO2023225821A1 (en) * | 2022-05-23 | 2023-11-30 | 华为数字能源技术有限公司 | Power supply module, control circuit, and electronic device |
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| CN109921632A (en) * | 2019-03-22 | 2019-06-21 | 广州金升阳科技有限公司 | A kind of reduction voltage circuit |
| WO2020152130A1 (en) * | 2019-01-25 | 2020-07-30 | Signify Holding B.V. | Lighting driver and drive method |
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| CN104779790A (en) * | 2015-03-12 | 2015-07-15 | 华南理工大学 | Switched inductance quasi-Z source DC-DC converter circuit |
| WO2020152130A1 (en) * | 2019-01-25 | 2020-07-30 | Signify Holding B.V. | Lighting driver and drive method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN114336857A (en) * | 2021-12-30 | 2022-04-12 | 深圳市沃特沃德信息有限公司 | Conversion circuit for series charging and parallel power supply |
| CN114336857B (en) * | 2021-12-30 | 2024-05-03 | 深圳市沃特沃德信息有限公司 | Conversion circuit for series charging and parallel power supply |
| WO2023225821A1 (en) * | 2022-05-23 | 2023-11-30 | 华为数字能源技术有限公司 | Power supply module, control circuit, and electronic device |
| CN116054361A (en) * | 2023-03-30 | 2023-05-02 | 浙江大学杭州国际科创中心 | Method for reducing bus capacitor volume and mobile power supply |
| CN116054361B (en) * | 2023-03-30 | 2023-06-06 | 浙江大学杭州国际科创中心 | A method for reducing the volume of bus capacitor and mobile power supply |
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