CN102638166A - Low-electromagnetic interference direct-current boost converter - Google Patents
Low-electromagnetic interference direct-current boost converter Download PDFInfo
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- CN102638166A CN102638166A CN2011100359203A CN201110035920A CN102638166A CN 102638166 A CN102638166 A CN 102638166A CN 2011100359203 A CN2011100359203 A CN 2011100359203A CN 201110035920 A CN201110035920 A CN 201110035920A CN 102638166 A CN102638166 A CN 102638166A
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Abstract
The invention discloses a low-electromagnetic interference direct-current boost converter, which comprises an independent voltage source, a first capacitor, a coupling inductor primary winding, a switch assembly, a first diode, a second capacitor, a coupling inductor secondary winding, a second diode and a third capacitor, wherein the coupling inductor primary winding and the secondary winding are magnetic assemblies which are directly wound on an iron core or a bobbin bracket; the coupling inductor primary winding and the secondary winding are opened without using insulating cement or any adhesive tape and increasing a bobbin bracket cover, so that the radiating space is enlarged; the first diode and the second diode are ultrafast recovery diodes or Schottky diodes; and the first capacitor, the second capacitor and the third capacitor are ceramic capacitors or electrolytic capacitors. According to the invention, a direct-current to direct-current converter is adopted, a coupling inductor with a primary winding and a secondary winding is taken as an energy storage device, the diodes and the capacitors are arranged between the primary winding and the secondary winding of the coupling inductor, and a discharge path is provided for the coupling inductor and a stray assembly during switch-off of the switch assembly, so that voltage/current sharp waves are reduced.
Description
Technical field
The present invention is a kind of improvement that is applied to LED driving circuit, particularly is applied on light-emitting diode ac conversion circuit and the LED power source supply.
Background technology
Be applied in the light-emitting diode electric pressure converter direct current to direct current transducer (DC/DC Converter); For a kind of improvement that is applied to LED driving circuit now, particularly be applied on light-emitting diode ac conversion circuit and the LED power source supply.
Please refer to Fig. 1, be the coupling inductance formula transducer of prior art.
Please refer to Fig. 2 and Fig. 3, in prior art, because of metal oxide semiconductcor field effect transistor (MOSFET) parasitic capacitance (Parasitic Component); For example lock draws the spuious assembly (Stray Component) that electric capacity 23 and PCB layout circuit (PCB Layout Line) or circuit component (Part) are drawn in electric capacity 21, lock source electric capacity 22 and source; For example stray inductance 11,12, can when switching, produce voltage/current sharp wave (Voltage/Current Spike, the Δ V/ Δ t of concussion; Δ i/ Δ t); This sharp wave not only can cause the circuit conversion decrease in efficiency, and because of containing the high frequency composition, also can produce radiativity electromagnetic interference (Radiation EMI); Cause on the circuit signal to disturb, when serious even cause running to be stopped.
This shows that above-mentioned existing article still have many disappearances, real non-good design, and demand urgently improveing.
Summary of the invention
The objective of the invention is to utilize and change circuit framework in the prior art; Add diode and electric capacity to absorb spuious assembly energy, reduce electromagnetic interference, and can promote converter efficiency; Previous product conversion efficiency is about 85～90%, and invention can promote more than the conversion efficiency to 90%.
The present invention comprises: independent voltage source, this independent voltage source negativing ending grounding for low electromagnetic interference DC boost converter; First electric capacity, this electric capacity one end and this independent voltage source anode connect in Dian Jie, this electric capacity other end ground connection; Winding of coupling inductance, winding one end of this coupling inductance and this independent voltage source anode connect in Dian Jie; Switch module, this switch module are three end assemblies, wherein have input in an other end of a winding of this coupling inductance of connection, and the switch module input is by control PWM (PWM) input signal, input end grounding; First diode, the other end of this a diode anode and a winding of this coupling inductance connects in Dian Jie, and the first diode negative terminal is connected with second capacitor, one end in point; Second electric capacity, winding one end of this electric capacity one end and this coupling inductance connects in Dian Jie, and this electric capacity other end connects in point and this first diode negative terminal circle; One coupling inductance secondary winding, this coupling inductance secondary winding one end and this first diode negative terminal connect in Dian Jie; Second diode, other end circle of this diode anode and this coupling inductance secondary winding connects; The 3rd electric capacity, this electric capacity one end is connected in the negative terminal of this second diode, the 3rd electric capacity other end ground connection in point.
Winding of this coupling inductance and secondary winding are for directly winding the line in the magnet assembly of iron core or winding the line in the magnet assembly of drum stand.Winding of this coupling inductance and secondary winding utilization do not use the opening of insulating cement, adhesive tape and increase drum stand lid to increase heat-dissipating space.This first diode and second diode are supper-fast recovery diode or Schottky diode.This first electric capacity, second electric capacity and the 3rd electric capacity are perhaps electrochemical capacitor of ceramic electrical.The present invention is that a direct current is to direct current transducer; Making winding of apparatus and secondary winding coupling inductance is energy accumulating device; Tool diode and electric capacity between winding of coupling inductance and secondary winding; Provide switch module when ending, the discharge path of coupling inductance and spuious assembly is to reduce the voltage/current sharp wave.
Description of drawings
Fig. 1 is a prior art coupling inductance formula transducer line map of the present invention;
Fig. 2 is a metal oxide semiconductcor field effect transistor parasitic capacitance sketch map;
Fig. 3 is the spuious assembly sketch map of circuit component and wiring;
Fig. 4 is first embodiment of the present invention circuit framework figure;
Fig. 5 is second embodiment of the present invention circuit framework figure;
Fig. 6 is third embodiment of the present invention circuit framework figure; And
Fig. 7 is fourth embodiment of the present invention circuit framework figure;
11,12, stray inductance Reference numeral:; 21, lock draws electric capacity; 22, lock source electric capacity; 23, electric capacity is drawn in the source; 111, first electric capacity; 112, second electric capacity; 113, the 3rd electric capacity; 121, winding of coupling inductance; 122, coupling inductance secondary winding; 131, first diode; 132, second diode; 141, switch module; 151,152,153,154,155,156, node; 211, first electric capacity; 212, second electric capacity; 213, the 3rd electric capacity; 221, winding of coupling inductance; 222, coupling inductance secondary winding; 231, first diode; 232, second diode; 241, switch module; 251,252,253,254,255,256, node; 311, first electric capacity; 312, second electric capacity; 321, winding of coupling inductance; 322, coupling inductance secondary winding; 331, first diode; 332, second diode; 341, switch module; 351,352,353,354,355,356, node; 411, first electric capacity; 412, second electric capacity; 413, the 3rd electric capacity; 421, winding of coupling inductance; 422, coupling inductance secondary winding; 431, first diode; 432, second diode; 441, switch module; 451,452,453,454,455,456, node.
Embodiment
Please refer to Fig. 4, be first embodiment of the present invention, comprising for low electromagnetic interference DC boost converter:
Independent voltage source, this independent voltage source negativing ending grounding; First electric capacity 111, this electric capacity one end and this independent voltage source anode connect in node 151 boundaries, this electric capacity other end ground connection; Winding 121 of coupling inductance, winding one end of this coupling inductance and this independent voltage source anode connect in node 151 boundaries; Switch module 141, this switch module 141 is three end assemblies, wherein has the other end of input in a winding of node 152 these coupling inductances of connection, switch module is in node 156 input control PWM (PWM) signals, output head grounding; First diode 131, the other end of this a diode anode and a winding 121 of this coupling inductance connects in node 152 boundaries, and first diode, 131 negative terminals are connected with second electric capacity, 112 1 ends in node 153; Second electric capacity 112, winding 121 1 ends of this electric capacity one end and this coupling inductance connect in node 151 boundaries, and this electric capacity other end connects in node 153 and these first diode, 131 negative terminals circle; Coupling inductance secondary winding 122, this coupling inductance secondary winding one end and this first diode, 131 negative terminals connect in node 153 boundaries; Second diode 132, other end circle of this diode anode and this coupling inductance secondary winding is connected to node 154; The 3rd electric capacity 113, this electric capacity one end is connected in the negative terminal of this second diode 132, the 3rd electric capacity 113 other end ground connection in node 155.
Winding 121 of this coupling inductance and secondary winding 122 is for directly winding the line in the magnet assembly of iron core or winding the line in the magnet assembly of drum stand.Winding 121 of this coupling inductance and secondary winding 122 utilize the opening that does not use insulating cement, adhesive tape and increase the drum stand lid to increase heat-dissipating space.This first diode 131 and second diode 132 are supper-fast recovery diode or Schottky diode.This first electric capacity 111, second electric capacity 112 and the 3rd electric capacity 113 are perhaps electrochemical capacitor of ceramic electrical.The present invention is that direct current is to direct current transducer; Making winding of apparatus and secondary winding coupling inductance is energy accumulating device; Tool diode and electric capacity between winding of coupling inductance and secondary winding; Provide switch module when ending, the discharge path of coupling inductance and spuious assembly is to reduce the voltage/current sharp wave.
Please refer to Fig. 5, be second embodiment of the present invention, comprising for low electromagnetic interference DC boost converter:
Independent voltage source, this independent voltage source negativing ending grounding; First electric capacity 211, this electric capacity one end and this independent voltage source anode connect in node 251 boundaries, this electric capacity other end ground connection; Winding 221 of coupling inductance, winding one end of this coupling inductance and this independent voltage source anode circle connect; Switch module 241, this switch module are three end assemblies, and wherein input is in the other end of a winding 221 of node 252 these coupling inductances of connection, in addition in node 256 input control PWM (PWM) signals, output head grounding; First diode 231, the other end of this a diode anode and a winding of this coupling inductance connects in node 252 boundaries; Second electric capacity 212, this electric capacity one end and this first diode negative terminal connect in node 253 boundaries, this electric capacity other end ground connection; Coupling inductance secondary winding 222, an end of this coupling inductance secondary winding and this first diode, 231 negative terminals connect in node 253 boundaries; The 3rd electric capacity 213, this electric capacity one end connect an end of this coupling inductance secondary winding 222 in node 253; Second diode 232, the other end of this diode anode and this coupling inductance secondary winding connects in node 255 boundaries, and the second diode negative terminal and the 3rd electric capacity other end connect in node 254 boundaries.
Winding 221 of this coupling inductance and secondary winding 222 is for directly winding the line in the magnet assembly of iron core or winding the line in the magnet assembly of drum stand.Winding 221 of this coupling inductance and secondary winding 222 utilize the opening that does not use insulating cement, adhesive tape and increase the drum stand lid to increase heat-dissipating space.This first diode 231 and second diode 232 are supper-fast recovery diode or Schottky diode.This first electric capacity 211, second electric capacity 212 and the 3rd electric capacity 213 are perhaps electrochemical capacitor of ceramic electrical.The present invention is that direct current is to direct current transducer; Making winding of apparatus and secondary winding coupling inductance is energy accumulating device; Tool diode and electric capacity between winding of coupling inductance and secondary winding; Provide switch module when ending, the discharge path of coupling inductance and spuious assembly is to reduce the voltage/current sharp wave.
Please refer to Fig. 6, be three embodiment of the present invention, comprising for low electromagnetic interference DC boost converter:
Independent voltage source, this independent voltage source negativing ending grounding; First electric capacity 311, this electric capacity one end and this independent voltage source anode connect in node 351 boundaries, this electric capacity other end ground connection; Winding 321 of coupling inductance, winding of this coupling inductance and this independent voltage source anode connect in node 351 boundaries; Switch module 341, this switch module are three end assemblies, and wherein input connects the other end of a winding of these coupling inductances in node 352, in addition in node 356 by control PWM (PWM) input signal, output head grounding; First diode 331, the other end of this a diode anode and a winding 321 of this coupling inductance connects in node 352 boundaries; Second electric capacity 312, this electric capacity one end and this first diode negative terminal connect in node 353 boundaries; Coupling inductance secondary winding 322, an end of this coupling inductance secondary winding and this first diode negative terminal connect in node 353 boundaries; Second diode 332, the other end of this diode anode and this coupling inductance secondary winding connects in node 355 boundaries, and negative terminal and this second electric capacity, 312 other ends connect in node 354 boundaries;
Winding 321 of this coupling inductance and secondary winding 322 is for directly winding the line in the magnet assembly of iron core or winding the line in the magnet assembly of drum stand.Winding 321 of this coupling inductance and secondary winding 322 utilize the opening that does not use insulating cement, adhesive tape and increase the drum stand lid to increase heat-dissipating space.This first diode 331 and second diode 332 are supper-fast recovery diode or Schottky diode.This first electric capacity 311, second electric capacity 312 are perhaps electrochemical capacitor of ceramic electrical.The present invention is that direct current is to direct current transducer; Making winding of apparatus and secondary winding coupling inductance is energy accumulating device; Tool diode and electric capacity between winding of coupling inductance and secondary winding; Provide switch module when ending, the discharge path of coupling inductance and spuious assembly is to reduce the voltage/current sharp wave.
Please refer to Fig. 7, be four embodiment of the present invention, comprising for low electromagnetic interference DC boost converter:
Independent voltage source, this independent voltage source negativing ending grounding; First electric capacity 411, this electric capacity one end and this independent voltage source anode connect in node 451 boundaries, this electric capacity other end ground connection; Winding 421 of coupling inductance, winding 421 1 ends of this coupling inductance and this independent voltage source anode connect in node 451 boundaries; Switch module 441, this switch module are three end assemblies, and wherein input is in the other end of a winding 421 of node 452 these coupling inductances of connection, in addition in node 455 input control PWM (PWM) signals, output head grounding; First diode 431, the other end of this a diode anode and a winding of this coupling inductance connects in node 452 boundaries; Second electric capacity 412, this electric capacity one end and this first diode, 431 negative terminals connect in node 453 boundaries, this electric capacity other end ground connection; Coupling inductance secondary winding 422, an end of an end of this coupling inductance secondary winding and a winding 421 of this coupling inductance connects in node 451 boundaries; The 3rd electric capacity 413, this electric capacity one end is connected in the negative terminal of this first diode 431 in node 453, and this electric capacity other end and second diode, 432 negative terminals connect in node 454 boundaries; Second diode 432, the other end of this diode anode and this coupling inductance secondary winding 422 connects in node 456 boundaries, and an end of the second diode negative terminal and the 3rd electric capacity 413 connects in node 454 boundaries.
Winding 421 of this coupling inductance and secondary winding 422 is for directly winding the line in the magnet assembly of iron core or winding the line in the magnet assembly of drum stand.Winding 421 of this coupling inductance and secondary winding 422 utilize the opening that does not use insulating cement, adhesive tape and increase the drum stand lid to increase heat-dissipating space.This first diode 431 and second diode 432 are supper-fast recovery diode or Schottky diode.This first electric capacity 411, second electric capacity 412 and the 3rd electric capacity 413 are perhaps electrochemical capacitor of ceramic electrical.The present invention is that direct current is to direct current transducer; Making winding of apparatus and secondary winding coupling inductance is energy accumulating device, and winding tool one diode of coupling inductance and electric capacity provide switch module when ending; The discharge path of coupling inductance and spuious assembly is to reduce the voltage/current sharp wave.
Claims (31)
1. low electromagnetic interference DC boost converter is characterized in that, comprising:
Independent voltage source, this independent voltage source negativing ending grounding;
First electric capacity, this electric capacity one end and this independent voltage source anode circle connect, this electric capacity other end ground connection;
Winding of coupling inductance, winding one end of this coupling inductance and this independent voltage source anode circle connect;
Switch module, this switch module are three end assemblies, wherein have the other end that input connects a winding of this coupling inductance, this switch module input input control pulse width modulation signal, output head grounding;
First diode, other end circle of this a diode anode and a winding of this coupling inductance connects, and this first diode negative terminal is connected with second capacitor, one end;
Second electric capacity, winding one end circle of this electric capacity one end and this coupling inductance connects, and this electric capacity other end and this first diode negative terminal circle connect;
The coupling inductance secondary winding, this coupling inductance secondary winding one end and this first diode negative terminal circle connect;
Second diode, other end circle of this diode anode and this coupling inductance secondary winding connects;
The 3rd electric capacity, this electric capacity one end is connected in the negative terminal of this second diode, the 3rd electric capacity other end ground connection.
2. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that, winding of said coupling inductance and coupling inductance secondary winding are for directly to wind the line in the magnet assembly of iron core.
3. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that, said coupling inductance first winding and coupling inductance second winding are the magnet assembly in drum stand of winding the line.
4. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that, said coupling inductance first winding and the coupling inductance second winding utilization do not use the opening of insulating cement, adhesive tape and increase drum stand lid to increase heat-dissipating space.
5. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that said first diode and second diode are supper-fast recovery diode.
6. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that said first diode and second diode are Schottky diode.
7. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that said first electric capacity, second electric capacity and the 3rd electric capacity are ceramic condenser.
8. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that said first electric capacity, second electric capacity and the 3rd electric capacity are electrochemical capacitor.
9. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that said switch module is a metal oxide semiconductcor field effect transistor.
10. low electromagnetic interference DC boost converter as claimed in claim 1 is characterized in that said switch module is a bipolar transistor.
11. low electromagnetic interference DC boost converter is characterized in that, comprising:
Independent voltage source, this independent voltage source negativing ending grounding;
First electric capacity, this electric capacity one end and this independent voltage source anode circle connect, this electric capacity other end ground connection;
Winding of coupling inductance, winding one end of this coupling inductance and this independent voltage source anode circle connect;
Switch module, this switch module are three end assemblies, and wherein input connects the other end of a winding of this coupling inductance, another input input control pulse width modulation signal, output head grounding; First diode, other end circle of this a diode anode and a winding of this coupling inductance connects;
Second electric capacity, this electric capacity one end and this first diode negative terminal circle connect, this electric capacity other end ground connection;
The coupling inductance secondary winding, an end of this coupling inductance secondary winding and this first diode negative terminal circle connect;
The 3rd electric capacity, this electric capacity one end connects an end of this coupling inductance secondary winding;
Second diode, other end circle of this diode anode and this coupling inductance secondary winding connects, and this second diode negative terminal and the 3rd electric capacity other end circle connect.
12. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that, winding of said coupling inductance and coupling inductance secondary winding are for directly to wind the line in the magnet assembly of iron core.
13. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that, winding of said coupling inductance and coupling inductance secondary winding are the magnet assembly in drum stand of winding the line.
14. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that, winding of said coupling inductance and the utilization of coupling inductance secondary winding do not use the opening of insulating cement, adhesive tape and increase drum stand lid to increase heat-dissipating space.
15. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that said first diode and second diode are supper-fast recovery diode.
16. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that said first diode and second diode are Schottky diode.
17. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that a said electric capacity, second electric capacity and the 3rd electric capacity are ceramic condenser.
18. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that said first electric capacity, second electric capacity and the 3rd electric capacity are electrochemical capacitor.
19. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that said switch module is a metal oxide semiconductcor field effect transistor.
20. low electromagnetic interference DC boost converter as claimed in claim 11 is characterized in that said switch module is a bipolar transistor.
21. low electromagnetic interference DC boost converter is characterized in that, comprising:
Independent voltage source, this independent voltage source negativing ending grounding;
First electric capacity, this electric capacity one end and this independent voltage source anode circle connect, this electric capacity other end ground connection;
Winding of coupling inductance, winding of this coupling inductance and this independent voltage source anode circle connect;
Switch module, this switch module are three end assemblies, and wherein input connects the other end of a winding of this coupling inductance, and another input is by control PWM input signal, output head grounding;
First diode, other end circle of this a diode anode and a winding of this coupling inductance connects;
Second electric capacity, this electric capacity one end and this first diode negative terminal circle connect;
The coupling inductance secondary winding, an end of this coupling inductance secondary winding and this first diode negative terminal circle connect;
Second diode, other end circle of this diode anode and this coupling inductance secondary winding connects, and negative terminal and this second electric capacity other end circle connect.
22. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that, winding of said coupling inductance and coupling inductance secondary winding are for directly to wind the line in the magnet assembly of iron core.
23. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that, winding of said coupling inductance and coupling inductance secondary winding are the magnet assembly in drum stand of winding the line.
24. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that, winding of said coupling inductance and the utilization of coupling inductance secondary winding do not use the opening of insulating cement, adhesive tape and increase drum stand lid to increase heat-dissipating space.
25. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that said first diode and second diode are supper-fast recovery diode.
26. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that said first diode and second diode are Schottky diode.
27. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that said first electric capacity and second electric capacity are ceramic condenser.
28. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that said first electric capacity and second electric capacity are electrochemical capacitor.
29. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that said switch module is a metal oxide semiconductcor field effect transistor.
30. low electromagnetic interference DC boost converter as claimed in claim 21 is characterized in that said switch module is a bipolar transistor.
31. low electromagnetic interference DC boost converter is characterized in that, comprising:
Independent voltage source, this independent voltage source negativing ending grounding;
First electric capacity, this electric capacity one end and this independent voltage source anode circle connect, this electric capacity other end ground connection;
Winding of coupling inductance, winding one end of this coupling inductance and this independent voltage source anode circle connect;
Switch module, this switch module are three end assemblies, and wherein input connects the other end of a winding of this coupling inductance, another input input control pulse width modulation signal, output head grounding;
First diode, other end circle of this a diode anode and a winding of this coupling inductance connects;
Second electric capacity, this electric capacity one end and this first diode negative terminal circle connect, this electric capacity other end ground connection;
The coupling inductance secondary winding, end circle of an end of this coupling inductance secondary winding and a winding of this coupling inductance connects;
The 3rd electric capacity, this electric capacity one end is connected in the negative terminal of this first diode, and this electric capacity other end and second diode negative terminal circle connect;
Second diode, other end circle of this diode anode and this coupling inductance secondary winding connects, and end circle of the second diode negative terminal and the 3rd electric capacity connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100359203A CN102638166A (en) | 2011-02-10 | 2011-02-10 | Low-electromagnetic interference direct-current boost converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100359203A CN102638166A (en) | 2011-02-10 | 2011-02-10 | Low-electromagnetic interference direct-current boost converter |
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| CN102638166A true CN102638166A (en) | 2012-08-15 |
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| CN2011100359203A Pending CN102638166A (en) | 2011-02-10 | 2011-02-10 | Low-electromagnetic interference direct-current boost converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020070498A1 (en) * | 2018-10-03 | 2020-04-09 | Ttp Ventus Ltd. | Methods and devices for driving a piezoelectric pump |
| US11828374B2 (en) | 2018-12-07 | 2023-11-28 | Ttp Ventus Ltd. | Valve |
| US11841094B2 (en) | 2018-12-07 | 2023-12-12 | Ttp Ventus Ltd. | Valve |
| US11933287B2 (en) | 2020-08-10 | 2024-03-19 | Ttp Ventus Ltd. | Pump for a microfluidic device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2660780Y (en) * | 2003-11-24 | 2004-12-01 | 郑清吉 | Electronic transformer |
| US20100202160A1 (en) * | 2009-02-12 | 2010-08-12 | Samsung Electro-Mechanics Co., Ltd. | Power converter transformer for suppressing conduction emi and power supply having its transformer |
-
2011
- 2011-02-10 CN CN2011100359203A patent/CN102638166A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2660780Y (en) * | 2003-11-24 | 2004-12-01 | 郑清吉 | Electronic transformer |
| US20100202160A1 (en) * | 2009-02-12 | 2010-08-12 | Samsung Electro-Mechanics Co., Ltd. | Power converter transformer for suppressing conduction emi and power supply having its transformer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020070498A1 (en) * | 2018-10-03 | 2020-04-09 | Ttp Ventus Ltd. | Methods and devices for driving a piezoelectric pump |
| US11835037B2 (en) | 2018-10-03 | 2023-12-05 | Ttp Ventus Ltd. | Methods and devices for driving a piezoelectric pump |
| US11828374B2 (en) | 2018-12-07 | 2023-11-28 | Ttp Ventus Ltd. | Valve |
| US11841094B2 (en) | 2018-12-07 | 2023-12-12 | Ttp Ventus Ltd. | Valve |
| US11933287B2 (en) | 2020-08-10 | 2024-03-19 | Ttp Ventus Ltd. | Pump for a microfluidic device |
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Application publication date: 20120815 |