CN101123394A - DC power conversion circuit having self-auxiliary power and self-protection - Google Patents
DC power conversion circuit having self-auxiliary power and self-protection Download PDFInfo
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- CN101123394A CN101123394A CNA2007101009060A CN200710100906A CN101123394A CN 101123394 A CN101123394 A CN 101123394A CN A2007101009060 A CNA2007101009060 A CN A2007101009060A CN 200710100906 A CN200710100906 A CN 200710100906A CN 101123394 A CN101123394 A CN 101123394A
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Abstract
A DC power conversion circuit with constant current output includes a DC voltage source, a driving circuit and a control signal generator. The DC voltage source is used for providing DC power. The driving circuit includes a switch, a resistor, a diode, and an inductor. The switch has three ends, one used for receiving a control signal. Furthermore, the switch is used for conducting or cutting off a coupling between the other two ends according to the control signal. The resistor is coupled between the switch and a first grounding end. The diode has a first end and a second end coupled to a second grounding end. The inductor has a first end coupled to the first grounding end, and a second end coupled to a load circuit. The control signal generator generates the control signal for the second end of the switch according to a current of the resistor.
Description
Technical field
The present invention relates to a kind of direct-current power supply converting circuit, particularly a kind of have a direct-current power supply converting circuit of deciding electric current output.
Background technology
In recent years, (Light Emitting Diode, LED) widespread usage is used on the indicator light and display unit of information, communication and consumption electronic products, as traffic signal light or the like light-emitting diode.Be different from general incandescent lamp bulb, light-emitting diode belongs to the chemiluminescence assembly, therefore have that power consumption is low, assembly life-span long, need not warm up advantages such as lamp time and reaction speed be fast, add that its volume is little, vibration resistance, be fit to volume production, therefore fit applications demand and make the assembly of minimum or array easily.In the physical characteristic of light-emitting diode, the electric current that luminous degree and its of light-emitting diode pass through is directly proportional, and the electric current by light-emitting diode that is to say along with a forward bias voltage drop of light-emitting diode is the increase of exponential type, when the electric current that passes through is big more, the intensity of led lighting is also high more.In addition, when the temperature change of context, the electric current of diode also presents the change of exponential type.In many application, as backlight liquid crystal display, traffic sign or the like, it is luminous with same degree all to need light-emitting diode to continue, in order to avoid cause the phenomenon that visually glimpses to take place.Therefore, in general, light-emitting diode needs a voltage conversion circuit to control its electric current, with stabilized illumination brightness.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of an existing direct current to dc voltage changer 10.Direct current includes a direct current power supply 100, a switching transistor 102, a resistance 104, a diode 106, an inductance 108, an electric capacity 110, a load 112, a control signal generator 114 and an electric pressure converter (high sider) 116 to dc voltage changer 10.Control signal generator 114 can produce a control signal Sc according to the output current of resistance 104, and changes the voltage level of control signal Sc by electric pressure converter 116, and with the unlatching of control switch transistor 102 or close, its operation principle is as follows.When switching transistor 102 conductings, diode 106 bears reverse bias and blocks a loop L1, makes 100 pairs of inductance 108 energy storage of power supply, and this moment, the electric current of resistance 104 rose gradually.When the electric current of resistance 104 rises to a predetermined level, control signal generator 114 is by control signal Sc off switch transistor 102.In case switching transistor 102 cuts out, then inductance 108 is understood the opposite voltage of polarizations, and diode 106 bears forward bias voltage drop and conducting loop L1, and this moment, the electric current of resistance 104 began to descend.In other words, existing direct current to the conducting of dc voltage changer 10 by switching transistor 102 with close, make the electric current of load 112 maintain in the small amplitude of oscillation electric current of steady load 112.
Existing direct current to dc voltage changer 10 in, because each assembly in control signal generator 114 and the circuit meets same earth terminal GND altogether, make switching transistor 102 and the different voltage levels in control signal generator 114 offices, switching transistor 102 is positioned at the high side of voltage (high side), and control signal generator 114 is positioned at a voltage downside.Therefore, in order to make suitably control switch transistor 102 of control signal Sc that control signal generator 114 produces, existing direct current need utilize electric pressure converter 116 to change the voltage level of control signal Sc in advance to dc voltage changer 10, the voltage level that is about to control signal Sc is promoted to the high side of voltage, so electric pressure converter 116 is generally the transformer combination.Therefore, concerning dc voltage changer 10, the complexity of circuit is still higher and area occupied is bigger for existing direct current.
Summary of the invention
Therefore, the present invention provides a kind of direct-current power supply converting circuit of deciding electric current output that has.
The present invention discloses a kind of direct-current power supply converting circuit of deciding electric current output that has.This direct-current power supply converting circuit includes a direct current voltage source, one drive circuit and a control signal generator.This direct voltage source is used to provide a direct current power supply.This drive circuit includes a switch, a resistance, a diode and an inductance.This switch has one first end and is coupled to this direct voltage source, and one second end is used for receiving a control signal, and one the 3rd end.This switch is used for the control signal that received according to this second end, conducting or close the binding of this first end to the 3rd end.This resistance has the 3rd end that one first end is coupled to this switch, and one second end idol is connected to one first earth terminal.This diode has one first end and is coupled to the 3rd end of this switch and this first end of this resistance, and one second end is coupled to one second earth terminal.This inductance has one first end and is coupled to this first earth terminal, and one second end is coupled to a load.This control signal generator is coupled to second end, the 3rd end of this switch, and this first earth terminal, is used for producing this second end that this controls signal to this switch according to the electric current of this resistance.
Description of drawings
Fig. 1 is the schematic diagram of an existing buck direct current to dc voltage changer.
Fig. 2 is the schematic diagram of the direct-current power supply converting circuit of one embodiment of the invention array output.
Fig. 3 is the schematic diagram of the direct-current power supply converting circuit of one embodiment of the invention array output.
The reference numeral explanation
10 direct currents are to dc voltage changer
102 switching transistors
20,30 direct-current power supply converting circuits
22,32 drive circuits
100,200,300 direct voltage sources
202,302 switches
104,204,304,314 resistance
106,206,306 diodes
108,208,308 inductance
110,210,310 electric capacity
112,212,312 loads
114,214,314 control signal generators
116 electric pressure converters
The Sc control signal
L1, L2, L3 loop
GND, GND1, GND2 earth terminal
2022,2024,2026,3022,3024,3026 end points
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the direct-current power supply converting circuit 20 of one embodiment of the invention array output.Direct-current power supply converting circuit 20 includes a direct current voltage source 200, one drive circuit 22, a control signal generator 214 and a load 212.Direct voltage source 200 is used to provide a direct current power supply and gives direct-current power supply converting circuit 20.The constituent components of drive circuit 22 is similar to the direct current of Fig. 1 to dc voltage changer 10, and it includes a switch 202, a resistance 204, a diode 206, an inductance 208 and a filter capacitor 210.Switch 202 has one first end 2022 and is coupled to direct voltage source 200, one second ends 2024 and is used for receiving the control signal Sc that control signal generator 214 is produced, and one the 3rd end 2026.Switch 202 is to be used for the control signal Sc that received according to second end 2024, conducting or close the binding of first end, 2022 to the 3rd ends 2026.Therefore, switch 202 can be a metal oxide semiconductcor field effect transistor (metal-oxide-semiconductor field-effecttransistor, MOSFET), then first end 2022 be the drain electrode, second end 2024 is grids, the 3rd end 2026 is source electrodes.Perhaps, switch 202 also can be a bipolarity junction transistor (Bipolar JunctionTransistor, BJT), then first end 2022 be the collection utmost point, second end 2024 is base stages, the 3rd end 2026 is emitter-base bandgap gradings.Resistance 104 idols that are different from Fig. 1 are connected between electric capacity 110 and the load 112, and resistance 204 idols are connected between switch 202 and the inductance 208, wherein, are provided with one first earth terminal GND1 between resistance 204 and the inductance 208.Diode 206 is coupled between the 3rd end 2026 and one second earth terminal GND2 of switch 202.Diode 206 is generally a pn and connects the surface semiconductor assembly, and the upper end in the icon is the p utmost point for n utmost point lower end.In addition, the first earth terminal GND1 is used to provide the power ground of control signal generator 214, and the second earth terminal GND2 is used to provide the power ground of direct voltage source 200, that is to say, other assembly is not altogether among control signal generator 26 and Fig. 2.Inductance 208 idol is connected between the first earth terminal GND1 and the load 212, is used for storing or discharging the energy that direct voltage source 200 provides, the maximum of controllable current or minimum value.Filter capacitor 210 is coupled between the inductance 208 and the second earth terminal GND2, is used for filtering to export the noise of the electric current of load 212 to.Control signal generator 214 is generally pulse width modulator (Pulse width modulator), is coupled to the two ends (wherein an end is the first earth terminal GND1) of resistance 204.But control signal generator 214 passes through the electric current of the first earth terminal GND1 sensing resistor 204, and changes second end 2024 of the suitable control signal Sc of generation to switch 202 according to electric current.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of the direct-current power supply converting circuit 30 of one embodiment of the invention array output.Direct-current power supply converting circuit 30 includes a direct current voltage source 300, one drive circuit 32, a control signal generator 314 and a load 312.Direct voltage source 300 is used to provide a direct current power supply and gives direct-current power supply converting circuit 30.Drive circuit 32 includes a switch 302, one first resistance 304, one second resistance 314, a diode 306, an inductance 308 and a filter capacitor 310.One end of first resistance 304 and one second resistance 314 all is coupled to the first earth terminal GND1, and the other end is coupled to control signal generator 314.As shown in Figure 3, compared to the drive circuit 22 of Fig. 2, drive circuit 32 is to increase by second resistance 314 to be coupled between one first earth terminal GND1 and the diode 308.Therefore, when switch 302 conductings, control signal generator 314 can be according to the variation of electric current on first resistance 304, produce a control signal Sc, and when switch 302 cut out, 314 variations according to electric current on second resistance 314 of control signal generator produced control signal Sc.
Therefore, when switch 302 conductings, diode 306 bears reverse bias and blocks a loop L3, makes that no current passes through on second resistance 314,300 pairs of inductance 308 energy storage of direct voltage source this moment, then the electric current of first resistance 304 is along with the electric current of inductance 308 progressively rises toward rising.When the electric current of resistance 304 rose to a predetermined maximum, control signal generator 314 was by control signal Sc off switch 302.In case switch 302 cuts out, direct voltage source 300 can't provide energy, first resistance 304 therefore no current passes through, the opposite voltage of inductance 308 meeting polarizations this moment, make diode 306 operate on conducting loop L3 under the forward bias voltage drop, then have electric current to pass through on second resistance 314 and its size of current descends along with the electric current of inductance 308.When the electric current of second resistance 314 dropped to a predetermined minimum value, control signal generator 314 was opened switch 202 by control signal Sc again, and the electric current of load 312 is maintained in certain scope.Therefore, in direct-current power supply converting circuit 30, control signal generator 214 not with other assembly altogether in the second earth terminal GND2, and reconfiguration is in the first earth terminal GND1, and in switch 302 conductings and down periods, change according to the electric current on first resistance 304 and second resistance 314 respectively, produce control signal Sc.The voltage level of the control signal Sc that control signal generator 314 produces is to be in the high side of voltage, can directly control signal Sc be delivered to switch 302, need not pass through other transformation assembly.
In sum, in the prior art, resistance is connected to the rear end of load, and control signal generator and DC power supply are altogether, make the control signal of generation be in different voltage levels with switch, therefore existing direct-current power supply converting circuit needs electric pressure converter to adjust the voltage level of control signal.Be different from prior art, in direct-current power supply converting circuit of the present invention, the control signal generator is not connected to same earth terminal altogether with other assembly, and resistance is arranged on after the switch, make control signal generator and switch be in the high side of voltage together, make control signal can directly be sent to switch, do not need the working voltage transducer.Therefore, direct-current power supply converting circuit of the present invention resistance is arranged on the high-pressure side and make the control signal generator not with other assembly altogether, can lower circuit complexity and save cost.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (16)
1. one kind has the direct-current power supply converting circuit of deciding electric current output, includes:
One direct current voltage source is used to provide a direct current power supply;
One drive circuit includes:
One switch has one first end and is coupled to this direct voltage source, and one second end is used for receiving a control signal, and one the 3rd end, and this switch is used for the control signal that received according to this second end, conducting or close the binding of this first end to the 3rd end;
One resistance has the 3rd end that one first end is coupled to this switch, and one second end idol is connected to one first earth terminal;
One diode has one first end and is coupled to the 3rd end of this switch and this first end of this resistance, and one second end is coupled to one second earth terminal; And
One inductance has one first end and is coupled to this first earth terminal, and one second end is coupled to a load; And
One control signal generator is coupled to second end, the 3rd end of this switch, and this first earth terminal, is used for electric current according to this resistance, produces this second end that this controls signal to this switch.
2. direct-current power supply converting circuit as claimed in claim 1, wherein, this control signal generator is a pulse width modulator.
3. direct-current power supply converting circuit as claimed in claim 1, wherein, other comprises a filter capacitor, is coupled between this second end of this second earth terminal and this inductance.
4. direct-current power supply converting circuit as claimed in claim 1, wherein, this switch is a metal oxide semiconductcor field effect transistor.
5. direct-current power supply converting circuit as claimed in claim 4, wherein, this of this switch first end is a drain electrode, this second end is a grid, and the 3rd end is an one source pole.
6. direct-current power supply converting circuit as claimed in claim 1, wherein, this switch is a bipolarity junction transistor.
7. direct-current power supply converting circuit as claimed in claim 6 road, wherein, this of this switch first end is a collection utmost point, this second end is a base stage, and the 3rd end is an emitter-base bandgap grading.
8. direct-current power supply converting circuit as claimed in claim 1, wherein, this of this diode first end is a n utmost point, this second end is a p utmost point.
9. one kind has the direct-current power supply converting circuit of deciding electric current output, includes:
One direct current voltage source is used to provide a direct current power supply;
One drive circuit includes:
One switch has one first end and is coupled to this direct voltage source, and one second end is used for receiving a control signal, and one the 3rd end, and this switch is used for the control signal that received according to this second end, conducting or close the binding of this first end to the 3rd end;
One first resistance has the 3rd end that one first end is coupled to this switch, and one second end idol is connected to one first earth terminal;
One second resistance has one first end, and one second end is coupled to this first earth terminal;
One diode has this first end that one first end is coupled to this second resistance, and one second end is coupled to one second earth terminal; And
One inductance has one first end and is coupled to this first earth terminal, and one second end is coupled to a load; And
One control signal generator is coupled to second end, the 3rd end of this switch, and first end of this second resistance, and this first earth terminal are used for electric current according to this resistance, produce this second end that this controls signal to this switch.
10. direct-current power supply converting circuit as claimed in claim 9, wherein, this control signal generator is a pulse width modulator.
11. direct-current power supply converting circuit as claimed in claim 9, wherein, other comprises a filter capacitor, is coupled between this second end of this second earth terminal and this inductance.
12. direct-current power supply converting circuit as claimed in claim 9, wherein, this switch is a metal oxide semiconductcor field effect transistor.
13. direct-current power supply converting circuit as claimed in claim 12, wherein, this of this switch first end is a drain electrode, and this second end is a grid, and the 3rd end is an one source pole.
14. direct-current power supply converting circuit as claimed in claim 9, wherein, this switch is a bipolarity junction transistor.
15. direct-current power supply converting circuit as claimed in claim 14 road, wherein, this of this switch first end is a collection utmost point, and this second end is a base stage, and the 3rd end is an emitter-base bandgap grading.
16. direct-current power supply converting circuit as claimed in claim 9, wherein, this of this diode first end is a n utmost point, and this second end is a p utmost point.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82157806P | 2006-08-07 | 2006-08-07 | |
| US60/821,578 | 2006-08-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101123394A true CN101123394A (en) | 2008-02-13 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101717958A Active CN100527579C (en) | 2006-08-07 | 2006-12-29 | DC power conversion circuit having self-auxiliary power and load fault protection |
| CNA2007101009060A Pending CN101123394A (en) | 2006-08-07 | 2007-04-28 | DC power conversion circuit having self-auxiliary power and self-protection |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101717958A Active CN100527579C (en) | 2006-08-07 | 2006-12-29 | DC power conversion circuit having self-auxiliary power and load fault protection |
Country Status (2)
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|---|---|
| CN (2) | CN100527579C (en) |
| TW (2) | TWI325675B (en) |
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| CN102076151A (en) * | 2011-01-10 | 2011-05-25 | 杭州矽力杰半导体技术有限公司 | High-efficiency light emitting diode (LED) drive circuit and drive method |
| CN102244954A (en) * | 2010-05-12 | 2011-11-16 | 英飞特电子（杭州）有限公司 | Constant current drive circuit with high power factor |
| CN102958233A (en) * | 2011-08-30 | 2013-03-06 | 凯杰照明股份有限公司 | Power supply drive circuit of light emitting diode light source and light source device |
| CN103179323A (en) * | 2011-12-26 | 2013-06-26 | 广明光电股份有限公司 | Digital signal transmission receiving device and method |
| CN104682741A (en) * | 2013-11-28 | 2015-06-03 | 徐运哲 | Power supply switching device supplied by pulsating direct current |
| CN105322778A (en) * | 2014-06-05 | 2016-02-10 | 克洛纳测量技术有限公司 | Field device with switching converter circuit |
| CN113241949A (en) * | 2021-07-12 | 2021-08-10 | 上海芯龙半导体技术股份有限公司南京分公司 | But BUCK-BOOST electrical power generating system of PWM pressure regulating |
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- 2006-12-21 TW TW95148261A patent/TWI325675B/en active
- 2006-12-29 CN CNB2006101717958A patent/CN100527579C/en active Active
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2007
- 2007-04-28 CN CNA2007101009060A patent/CN101123394A/en active Pending
- 2007-05-02 TW TW96115570A patent/TWI338994B/en active
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| CN102244954A (en) * | 2010-05-12 | 2011-11-16 | 英飞特电子（杭州）有限公司 | Constant current drive circuit with high power factor |
| CN102076151A (en) * | 2011-01-10 | 2011-05-25 | 杭州矽力杰半导体技术有限公司 | High-efficiency light emitting diode (LED) drive circuit and drive method |
| CN103152946A (en) * | 2011-01-10 | 2013-06-12 | 矽力杰半导体技术(杭州)有限公司 | High-efficiency LED (light emitting diode) driving circuit |
| CN102958233A (en) * | 2011-08-30 | 2013-03-06 | 凯杰照明股份有限公司 | Power supply drive circuit of light emitting diode light source and light source device |
| CN102958233B (en) * | 2011-08-30 | 2015-01-07 | 宏齐科技股份有限公司 | Power supply drive circuit of light emitting diode light source and light source device |
| CN103179323A (en) * | 2011-12-26 | 2013-06-26 | 广明光电股份有限公司 | Digital signal transmission receiving device and method |
| CN104682741A (en) * | 2013-11-28 | 2015-06-03 | 徐运哲 | Power supply switching device supplied by pulsating direct current |
| CN104682741B (en) * | 2013-11-28 | 2019-06-07 | 徐运哲 | The power supply change-over device powered by Rectified alternating current |
| CN105322778A (en) * | 2014-06-05 | 2016-02-10 | 克洛纳测量技术有限公司 | Field device with switching converter circuit |
| CN114025284A (en) * | 2020-07-19 | 2022-02-08 | 知微电子有限公司 | Driving circuit with energy recovery capability |
| CN114025284B (en) * | 2020-07-19 | 2024-05-28 | 知微电子有限公司 | Drive circuit with energy recovery capability |
| CN113241949A (en) * | 2021-07-12 | 2021-08-10 | 上海芯龙半导体技术股份有限公司南京分公司 | But BUCK-BOOST electrical power generating system of PWM pressure regulating |
| CN113241949B (en) * | 2021-07-12 | 2021-10-01 | 上海芯龙半导体技术股份有限公司南京分公司 | But BUCK-BOOST electrical power generating system of PWM pressure regulating |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200810339A (en) | 2008-02-16 |
| TW200810334A (en) | 2008-02-16 |
| CN101123397A (en) | 2008-02-13 |
| TWI338994B (en) | 2011-03-11 |
| TWI325675B (en) | 2010-06-01 |
| CN100527579C (en) | 2009-08-12 |
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Open date: 20080213 |