CN203326879U - Quasi-single-stage high-power-factor constant-current circuit and device - Google Patents
Quasi-single-stage high-power-factor constant-current circuit and device Download PDFInfo
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- CN203326879U CN203326879U CN2013203399512U CN201320339951U CN203326879U CN 203326879 U CN203326879 U CN 203326879U CN 2013203399512 U CN2013203399512 U CN 2013203399512U CN 201320339951 U CN201320339951 U CN 201320339951U CN 203326879 U CN203326879 U CN 203326879U
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The utility model provides a quasi-single-stage high-power-factor constant-current circuit and device. The quasi-single-stage high-power-factor constant-current circuit includes a rectifier bridge; an input capacitor, a first inductor provided with a first end connected with a first end of the input capacitor; a bus capacitor provided with a first end connected with a second end of the inductor; a first diode provided with an anode connected with a second end of the bus capacitor and provided with a cathode connected with a negative output terminal of the rectifier bridge; a switch tube provided with a first power terminal connected with a second end of the first inductor; a second diode provided with an anode connected with a second power terminal of the switch tube and provided with a cathode connected with the negative output terminal of the rectifier bridge; a sampling resistor provided with a first end connected with the second power terminal of the switch tube; a second inductor provided with a first end connected with a second end of the sampling resistor; an output diode provided with a cathode connected with the second power terminal of the switch tube and an anode connected with the second end of the bus capacitor; an output capacitor provided with a first end connected with a second end of the second inductor and provided with a second end connected with the anode of the output diode. Compared with a two-stage structure, the structure of the quasi-single-stage high-power-factor constant-current circuit provided by the utility model is simple, so that circuit cost can be reduced. And compared with a single-stage structure, the structure of the quasi-single-stage high-power-factor constant-current circuit provided by the utility model facilitates the reduction of load ripple current.
Description
Technical field
The utility model relates to switch power technology, relates in particular to a kind of quasi-single-stage constant current circuit with high power factor and device.
Background technology
Because the existence of the non-linear element in the most power consumption equipment and energy-storage travelling wave tube can make the input AC current waveform, serious distortion occurs, net side input power factor is very low, in order to meet the harmonic requirement of international standard IEC61000-3-2, must in these power consumption equipments, add Active PFC (PFC) device.
General boost (Boost) topology, buck (Buck-boost) topology or voltage-dropping type (Buck) topology of adopting of traditional APFC.Wherein, the Boost topology has and controls easily, drives the power factor simple, can carry out switch, input current in whole power frequency period can be close to the characteristics such as 1.But the Boost topological circuit has the shortcoming that output voltage is high, and under wide region input (90Vac-265Vac) condition, in the efficiency of low-voltage section (90Vac-110Vac) than the low 1-3% of high voltage section (220Vac-265Vac).And adopting the Buck-boost topology, the relative Buck topology of circuit loss can be larger.In the low-power applications occasion, the Buck topology can keep greater efficiency in whole input voltage range.Because industrial thermal design all designs according to the efficiency minimum point, so the thermal design of Buck topology is also simple than Boost topological sum Buck-boost topology.So the Buck topology is used in commercial Application more and more at present.
Fig. 1 shows the Buck pfc circuit structure of a kind of single-stage of the prior art, comprising: rectifier bridge 10 receives input signal V
AcInput capacitance C
In, be connected between two outputs of rectifier bridge 10; Inductance L, the one end connects an output of rectifier bridge 10, and its other end connects output capacitance C
oAn end; Output capacitance C
o, the one end connects the other end of inductance L, the input of its other end connecting valve pipe Q1; Load R
Load, be connected in parallel on output capacitance C
oTwo ends; Diode D
o, negative electrode connects an output of rectifier bridge 10, the input of anodic bonding switching tube Q1; Switching tube Q1, output connects another output of rectifier bridge 10, and control end connects the output of PFC control circuit 11.
Yet the single-stage Buck pfc circuit that the Fig. 1 of take is example, although circuit structure is simple, circuit cost is low, shortcoming is that output loading exists larger ripple current (being generally the ripple current of 100Hz), can cause stroboscopic, can't be applicable to the application scenario that some is had relatively high expectations to stroboscopic.
The utility model content
Problem to be solved in the utility model is to provide a kind of quasi-single-stage constant current circuit with high power factor and device, can reduce circuit cost than traditional two-stage circuit, can reduce the ripple current of load than traditional single-level circuit, the rear class main circuit adopts Buck type structure to obtain greater efficiency, by simple control, can obtain the output loading constant current.
For solving the problems of the technologies described above, the utility model provides a kind of quasi-single-stage constant current circuit with high power factor and device, comprising:
Rectifier bridge, to the ac supply signal rectification of input;
Input capacitance, its first end connects the positive output end of described rectifier bridge, and its second end connects the negative output terminal of described rectifier bridge;
The first inductance, its first end connects the first end of described input capacitance;
Bus capacitor, its first end connects the second end of described the first inductance;
The first diode, the second end of the described bus capacitor of its anodic bonding, its negative electrode connects the negative output terminal of described rectifier bridge;
Switching tube, its first power end connects the second end of described the first inductance, and its control end receives outside driving signal;
The second diode, the second power end of the described switching tube of its anodic bonding, its negative electrode connects the negative output terminal of described rectifier bridge;
Sampling resistor, its first end connects the second power end of described switching tube;
The second inductance, its first end is connected with the second end of described sampling resistor;
Output diode, its negative electrode is connected with the second power end of described switching tube, and its anode is connected with the second end of described bus capacitor;
Output capacitance, its first end is connected with the second end of described the second inductance, and its second end is connected with the anode of described output diode, and described output capacitance is configured in parallel with load.
According to an embodiment of the present utility model, described switching tube is power MOSFET, the drain electrode that described the first power end is described mosfet transistor, the source electrode that described the second power end is described mosfet transistor, the grid that described control end is described mosfet transistor.
According to an embodiment of the present utility model, described switching tube is pliotron, the collector electrode that described the first power end is described pliotron, the emitter that described the second power end is described pliotron, the base stage that described control end is described pliotron.
According to an embodiment of the present utility model, described switching tube is source drive unit switch device, comprise the first MOS transistor and the second MOS transistor, wherein, the drain electrode that described the first power end is described the first MOS transistor, the source electrode that described the second power end is described the second MOS transistor, the grid that described control end is described the second MOS transistor, the source electrode of described the first MOS transistor connects the drain electrode of described the second MOS transistor, and the grid of described the first MOS transistor receives default direct voltage.
The utility model also provides a kind of quasi-single-stage High Power Factor device, comprising:
The described quasi-single-stage constant current circuit with high power factor of above any one;
Control circuit, its current sample end sampling obtains the current information of described sampling resistor, described control circuit produces the driving signal according to the current information of described sampling resistor and the current over-zero information of described the second inductance, and described driving signal transfers to the control end of described switching tube via output.
According to an embodiment of the present utility model, the current sample end of described control circuit connects the first end of described sampling resistor, the second end ground connection of described sampling resistor; Perhaps the current sample end of described control circuit connects the second end of described sampling resistor, the first end ground connection of described sampling resistor.
According to an embodiment of the present utility model, described control circuit obtains the current over-zero information of described the second inductance by the zero passage detection end, described zero passage detection end is connected with the second end of described the second inductance via resistance pressure-dividing network, wherein, the input of described resistance pressure-dividing network connects the second end of described the second inductance, and the output of described resistance pressure-dividing network connects the zero passage detection end of described control circuit.
According to an embodiment of the present utility model, described control circuit obtains the current over-zero information of described the second inductance by the zero passage detection end, described zero passage detection end connects the first end of auxiliary winding, the second end ground connection of described auxiliary winding, described auxiliary winding and described the second inductance coupling high.
According to an embodiment of the present utility model, described control circuit is controlled for the output loading constant current.
Compared with prior art, the utlity model has following advantage:
Constant current circuit with high power factor of the present utility model and the device single step arrangement that is as the criterion, main circuit structure, for sharing the two-stage circuit of a power switch pipe, only needs a set of control circuit, compares the two-stage type structure, and circuit structure is simpler, is conducive to circuit cost; Compare the single stage type structure, greatly reduce the ripple current of output loading, without stroboscopic.
In addition, the second level circuit of constant current circuit with high power factor of the present utility model is the Buck circuit, except realizing high efficiency, the current information (being equal to the outputting inductance electric current) that control circuit can directly receive on sampling resistor is realized output loading constant current control, further simplifies circuit structure.
The accompanying drawing explanation
Fig. 1 is the electrical block diagram of a kind of single-stage Buck type constant current circuit with high power factor in prior art;
Fig. 2 is the electrical block diagram of the quasi-single-stage high power factor constant current device of the utility model the first embodiment;
Fig. 3 is the structural representation of the unit switch device of source drive;
Fig. 4 is the schematic equivalent circuit of quasi-single-stage high power factor constant current device under the first operating state of the utility model the first embodiment;
Fig. 5 is the schematic equivalent circuit of quasi-single-stage high power factor constant current device under the second operating state of the utility model the first embodiment;
Fig. 6 is the electrical block diagram of the quasi-single-stage high power factor constant current device of the utility model the second embodiment;
Fig. 7 is the electrical block diagram of the quasi-single-stage high power factor constant current device of the utility model the 3rd embodiment;
Fig. 8 is the electrical block diagram of the quasi-single-stage high power factor constant current device of the utility model the 4th embodiment.
Embodiment
Below in conjunction with specific embodiments and the drawings, the utility model is described in further detail, but should not limit protection range of the present utility model with this.
The first embodiment
With reference to figure 2, Fig. 2 shows the quasi-single-stage high power factor constant current device of the first embodiment, comprises quasi-single-stage constant current circuit with high power factor and control circuit 200, and wherein, the quasi-single-stage constant current circuit with high power factor comprises rectifier bridge B
1, input capacitance C
In, the first inductance L
1, bus capacitor C
1, the first diode D
1, switching tube Q
1, the second diode D
2, sampling resistor R
sen, the second inductance L
2, output diode D
oAnd output capacitance C
o.
Furthermore, rectifier bridge B
1Input termination ac supply signal and it is carried out to rectification, rectifier bridge B
1Positive output end connect input capacitance C
InFirst end, the first inductance L
1First end, rectifier bridge B
1Negative output termination input capacitance C
InThe second end, the first diode D
1Negative electrode and the second diode D
2Negative electrode, the first inductance L
1The second termination switching tube Q
1The first power end and bus capacitor C
1First end, switching tube Q
1The second power termination sampling resistor R
senFirst end, the second diode D
2Anode and output diode D
oNegative electrode, sampling resistor R
senSecond termination the second inductance L
2First end ground connection, the second inductance L
2The second termination output capacitance C
oFirst end, output capacitance C
oThe second termination output diode D
oAnode, the second end and the first diode D of bus capacitor C1
1Anode, output capacitance C
oTwo ends connect load.
In the first embodiment, the current sample end CS of control circuit 200 connects sampling resistor R
senFirst end, the ground end GND ground connection of control circuit 200, the output DRV of control circuit 200 meets switching tube Q
1Control end, the zero passage detection end ZCD of control circuit 200 connects the second inductance L by resistance pressure-dividing network
2The second end.As a nonrestrictive example, the resistance pressure-dividing network in Fig. 2 comprises resistance R
1And resistance R
2, zero passage detection end ZCD connecting resistance R wherein
1First end and resistance R
2First end, resistance R
1Second termination the second inductance L
2The second end, resistance R
2The second end ground connection.
The sampling resistor R that control circuit 200 samples according to current sample end CS
senCurrent information and the second inductance L of detecting of zero passage detection end ZCD
2Current over-zero information (by resistance R
1And resistance R
2To the second inductance L
2The voltage of the second end carry out dividing potential drop detect obtain) produce and drive signal, this driving signal transfers to switching tube Q via output DRV
1Control end.
Switching tube Q
1Can be power MOSFET, wherein, switching tube Q
1The first power end be mosfet transistor drain electrode, the source electrode that the second power end is mosfet transistor, grid that control end is mosfet transistor; Perhaps, switching tube Q
1Can be pliotron, switching tube Q
1The first power end be pliotron collector electrode, the emitter that the second power end is described pliotron, base stage that control end is described pliotron.
In addition, switching tube Q
1Can also be the unit switch device of the source drive shown in Fig. 3, the unit switch device of this source drive comprises the first MOS transistor Q
aWith the second MOS transistor Q
b, wherein, the first power end is the first MOS transistor Q
aDrain electrode, the second power end is the second MOS transistor Q
bSource electrode, control end is the second MOS transistor Q
bGrid, the first MOS transistor Q
aSource electrode connect the second MOS transistor Q
bDrain electrode, the grid of the first MOS transistor receives default direct voltage.As a nonrestrictive example, this default direct voltage can be by direct voltage source V
DCProvide, for example direct voltage source V
DCAn end with the grid of the first MOS transistor, be connected, other end ground connection.
Fig. 4 is the equivalent circuit diagram of quasi-single-stage high power factor constant current device when the first operating state shown in Fig. 2, and in figure, dotted portion means that this circuit does not participate in work.In the first operating state, switching tube Q
1Conducting, the input ac power signal is through rectifier bridge B
1Half-sinusoid voltage after rectification is through switching tube Q
1, the second diode D
2With the first inductance L
1The first inductance L is given in the loop formed
1Charging, first inductance L of flowing through
1Current i
L1Rise; Simultaneously, bus capacitor C
1Through switching tube Q
1, sampling resistor R
sen, the second inductance L
2With output capacitance C
oThe second inductance L is given in the loop formed
2Charging, the second inductance L
2Current i
L2Rise.
Fig. 5 is the equivalent circuit diagram of quasi-single-stage high power factor constant current device when the second operating state shown in Fig. 2, and in figure, dotted portion means that this circuit does not participate in work.In the second operating state, switching tube Q
1Disconnect first inductance L of flowing through
1Current i
L1Through input capacitance C
In, the first inductance L
1, bus capacitor C
1With the first diode D
1The loop afterflow formed, current i
L1Descend; Meanwhile, second inductance L of flowing through
2Current i
L2Through switching tube Q
1, sampling resistor R
sen, the second inductance L
2, output capacitance C
oWith output diode D
oThe loop afterflow formed, current i
L2Descend.
As seen from the above analysis, the sampling resistor R that flows through
senElectric current be the second inductance L
2Current i
L2, therefore only need to be by sampling resistor R
senCurrent information send into control circuit 200, by the constant-current control circuit of some prior aries, can realize the constant current of output loading is controlled; In addition, by by the second inductance L
2Current i
L2Zero passage information (detecting the voltage zero-cross information of the second end of the second inductance L 2) send into control circuit 200, can realize current i
L2For critical continuous conduction mode.Meanwhile, only need make first inductance L of flowing through by rational parameter designing
1Current i
L1Control as the discontinuous current pattern, get final product the power factor correction that nature realizes exchanging input current.In addition, by the bus capacitor C of larger capacity
1Can reduce bus capacitor C
1The voltage ripple at two ends, thus less output load current ripple obtained, eliminate the 100Hz stroboscopic.
The second embodiment
With reference to figure 6, Figure 6 shows that the quasi-single-stage high power factor constant current device of the second embodiment.The main circuit of the present embodiment and aforesaid the first embodiment are basic identical, and operation principle is also basic identical, so no longer describe in detail.The first embodiment difference shown in the main circuit of the present embodiment and Fig. 2 is that control circuit 300 and main circuit contact change, in the present embodiment, and sampling resistor R
senFirst end ground connection, sampling resistor R
senThe current sample end CS of the second termination control circuit 300, therefore the current information of sending into control circuit 300 is the second negative inductive current information, in the inner basic function that can realize equally after oppositely with the first embodiment shown in Fig. 2 of control circuit 300, as power factor correction, output constant current etc.
The 3rd embodiment
With reference to figure 7, Figure 7 shows that the quasi-single-stage high power factor constant current device of the 3rd embodiment.Shown in the present embodiment main circuit and Fig. 2, the first embodiment difference is the second inductance L
2Current over-zero detection mode difference.In the present embodiment, increased and the second inductance L
2The auxiliary winding W of coupling
a, auxiliary winding W
aFor detection of the second inductance L
2Current over-zero information, the second inductance L
2Be equivalent to and auxiliary winding W
aCoupling forms transformer, the second inductance L
2Auxiliary winding W
aSame Name of Ends ground connection, auxiliary winding W
aThe zero passage detection end ZCD of different name termination control circuit 200.Shown in the present embodiment main circuit and Fig. 2, the first embodiment is basic identical, and operation principle is also basic identical, so no longer describe in detail.
The 4th embodiment
With reference to figure 8, Figure 8 shows that the quasi-single-stage high power factor constant current device of the 4th embodiment.The 3rd embodiment shown in the present embodiment main circuit and Fig. 7 is basic identical, and operation principle is also basic identical.The 3rd embodiment difference shown in the present embodiment main circuit and Fig. 7 is that control circuit 300 and main circuit contact change, in the present embodiment, and sampling resistor R
senFirst end ground connection, sampling resistor R
senThe current sample end CS of the second termination control circuit 300, the current information of therefore sending into control circuit 300 is the second negative inductance L
2Current information, in the inner basic function that can realize equally after oppositely with the 3rd embodiment shown in Fig. 7 of control circuit 300, as power factor correction, output constant current etc.
In addition, it should be noted that, although in above four embodiment, be all to have used the zero passage detection end by control circuit, by detecting the second inductance L
2Current zero-crossing point realize that second level Buck circuit working is at electric current critical continuous mode conduction mode, but be not limited to this, those skilled in the art are to be understood that, when the second level of described quasi-single-stage constant current circuit with high power factor Buck circuit working in some mode of operation when determined frequency, control circuit also can not need to use the zero passage detection end.
The above, be only preferred embodiment of the present utility model, not the utility model done to any pro forma restriction.Therefore, every content that does not break away from technical solutions of the utility model, just according to technical spirit of the present utility model to any simple modification made for any of the above embodiments, the conversion that is equal to, all still belong in the protection range of technical solutions of the utility model.
Claims (9)
1. a quasi-single-stage constant current circuit with high power factor, is characterized in that, comprising:
Rectifier bridge, to the ac supply signal rectification of input;
Input capacitance, its first end connects the positive output end of described rectifier bridge, and its second end connects the negative output terminal of described rectifier bridge;
The first inductance, its first end connects the first end of described input capacitance;
Bus capacitor, its first end connects the second end of described the first inductance;
The first diode, the second end of the described bus capacitor of its anodic bonding, its negative electrode connects the negative output terminal of described rectifier bridge;
Switching tube, its first power end connects the second end of described the first inductance, and its control end receives outside driving signal;
The second diode, the second power end of the described switching tube of its anodic bonding, its negative electrode connects the negative output terminal of described rectifier bridge;
Sampling resistor, its first end connects the second power end of described switching tube;
The second inductance, its first end is connected with the second end of described sampling resistor;
Output diode, its negative electrode is connected with the second power end of described switching tube, and its anode is connected with the second end of described bus capacitor;
Output capacitance, its first end is connected with the second end of described the second inductance, and its second end is connected with the anode of described output diode, and described output capacitance is configured in parallel with load.
2. quasi-single-stage constant current circuit with high power factor according to claim 1, it is characterized in that, described switching tube is power MOSFET, the drain electrode that described the first power end is described mosfet transistor, the source electrode that described the second power end is described mosfet transistor, the grid that described control end is described mosfet transistor.
3. quasi-single-stage constant current circuit with high power factor according to claim 1, it is characterized in that, described switching tube is pliotron, the collector electrode that described the first power end is described pliotron, the emitter that described the second power end is described pliotron, the base stage that described control end is described pliotron.
4. quasi-single-stage constant current circuit with high power factor according to claim 1, it is characterized in that, described switching tube is source drive unit switch device, comprise the first MOS transistor and the second MOS transistor, wherein, the drain electrode that described the first power end is described the first MOS transistor, the source electrode that described the second power end is described the second MOS transistor, the grid that described control end is described the second MOS transistor, the source electrode of described the first MOS transistor connects the drain electrode of described the second MOS transistor, and the grid of described the first MOS transistor receives default direct voltage.
5. a quasi-single-stage high power factor constant current device, is characterized in that, comprising:
The described quasi-single-stage constant current circuit with high power factor of any one in claim 1 to 4;
Control circuit, its current sample end sampling obtains the current information of described sampling resistor, described control circuit produces the driving signal according to the current information of described sampling resistor and the current over-zero information of described the second inductance, and described driving signal transfers to the control end of described switching tube via output.
6. quasi-single-stage high power factor constant current device according to claim 5, is characterized in that, the current sample end of described control circuit connects the first end of described sampling resistor, the second end ground connection of described sampling resistor; Perhaps the current sample end of described control circuit connects the second end of described sampling resistor, the first end ground connection of described sampling resistor.
7. quasi-single-stage high power factor constant current device according to claim 5, it is characterized in that, described control circuit obtains the current over-zero information of described the second inductance by the zero passage detection end, described zero passage detection end is connected with the second end of described the second inductance via resistance pressure-dividing network, wherein, the input of described resistance pressure-dividing network connects the second end of described the second inductance, and the output of described resistance pressure-dividing network connects the zero passage detection end of described control circuit.
8. quasi-single-stage high power factor constant current device according to claim 5, it is characterized in that, described control circuit obtains the current over-zero information of described the second inductance by the zero passage detection end, described zero passage detection end connects the first end of auxiliary winding, the second end ground connection of described auxiliary winding, described auxiliary winding and described the second inductance coupling high.
9. quasi-single-stage high power factor constant current device according to claim 5, is characterized in that, described control circuit is controlled for the output loading constant current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203399512U CN203326879U (en) | 2013-06-09 | 2013-06-09 | Quasi-single-stage high-power-factor constant-current circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203399512U CN203326879U (en) | 2013-06-09 | 2013-06-09 | Quasi-single-stage high-power-factor constant-current circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN203326879U true CN203326879U (en) | 2013-12-04 |
Family
ID=49666171
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|---|---|---|---|
| CN2013203399512U Withdrawn - After Issue CN203326879U (en) | 2013-06-09 | 2013-06-09 | Quasi-single-stage high-power-factor constant-current circuit and device |
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| Country | Link |
|---|---|
| CN (1) | CN203326879U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269162A (en) * | 2013-06-09 | 2013-08-28 | 杭州士兰微电子股份有限公司 | Quasi-single-stage high power factor constant current circuit and device |
| CN114499188A (en) * | 2022-01-26 | 2022-05-13 | 上海南麟集成电路有限公司 | DC-DC voltage reduction circuit |
-
2013
- 2013-06-09 CN CN2013203399512U patent/CN203326879U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269162A (en) * | 2013-06-09 | 2013-08-28 | 杭州士兰微电子股份有限公司 | Quasi-single-stage high power factor constant current circuit and device |
| CN103269162B (en) * | 2013-06-09 | 2015-09-16 | 杭州士兰微电子股份有限公司 | A kind of Quasi-single-stage high power factor constant current circuit and device |
| CN114499188A (en) * | 2022-01-26 | 2022-05-13 | 上海南麟集成电路有限公司 | DC-DC voltage reduction circuit |
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