CN101123397A - DC power conversion circuit having self-auxiliary power and load fault protection - Google Patents
DC power conversion circuit having self-auxiliary power and load fault protection Download PDFInfo
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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 is meant a kind of direct-current power supply converting circuit, refers to a kind of driven for emitting lights device that is used for especially, has the direct-current power supply converting circuit of self-auxiliary source and load open circuit and short-circuit protection function.
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 is to belong to the chemiluminescence element, therefore have that power consumption is low, component life 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 element of minimum or array easily.In the physical characteristic of light-emitting diode, electric current by light-emitting diode is along with the forward bias voltage drop of light-emitting diode is the increase of exponential type, and the luminous degree of light-emitting diode is to be directly proportional with the electric current that passes through, and that is to say, when the electric current that passes through is big more, the intensity of led lighting is also high more.Therefore, in general, light-emitting diode needs voltage conversion circuit to control its forward bias voltage drop, with stabilized illumination brightness.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of known direct current to dc voltage changer 10.Direct current includes direct voltage source 100, switching transistor 102, resistance 104, diode 106, inductance 108, control signal generator 110, load 112 and linear voltage regulator (linearregulator) 114 to dc voltage changer 10.Linear voltage regulator 114 is generally IC chip or simple bias circuit, can downgrade voltage that direct voltage source 100 provides to suitable voltage level, with supply control signal generator 110 needed operating voltages.Control signal generator 110 produces control signal Sc and opens or off switch transistor 102 by the curtage at sensing resistor 104 two ends, exports the electric current of load 112 to control, and its operation principle is as follows.When switching transistor 102 conductings, diode 106 bears reverse bias and blocks loop L1, makes 100 pairs of inductance 108 energy storage of direct voltage source.In case switching transistor 102 cuts out, then inductance 108 can the opposite voltage of polarization.In other words, when switching transistor 102 conductings, 100 pairs of inductance 108 storage power of direct voltage source, and when switching transistor 102 cuts out, diode 106 conducting loop L1,108 of inductance are transplanted on electric capacity 110 and load 112 to energy.
In known technology, linear voltage regulator 114 is by reduced pressure operation, and the voltage in conversion dc voltage source 100 is to lower voltage, to provide working power to control signal generator 110.Yet known direct current is very poor usually to the pressure regulation efficient (ratio of output voltage and input voltage) of the linear voltage regulator 114 of dc voltage changer 10, has only 5%～10% approximately.For instance, provide when direct voltage source 100 170 volts voltage to direct current to dc voltage changer 10, linear voltage regulator 114 generally downgrades 17 volts with the voltage of 170 volts (V), exports control signal generator 110 again to, and the efficient of hence one can see that linear voltage regulator is 10%.If the size of current by linear voltage regulator 114 is about 20 milliamperes (mA), then the power that expends of linear voltage regulator 114 is: (170-17) * and 20=3.06 watt (W).As from the foregoing, known direct current is to utilize inefficient linear voltage regulator to provide working power to the control signal generator to dc voltage changer 10, and not only consume electric power also may be damaged circuit because linear voltage regulator is overheated.
Summary of the invention
Therefore, main purpose of the present invention promptly is to provide a kind of direct-current power supply converting circuit with self-auxiliary source and load open circuit and short-circuit protection function.
The present invention discloses a kind of direct-current power supply converting circuit with self-auxiliary source and load open circuit and short-circuit protection function.This direct-current power supply converting circuit includes direct voltage source, drive circuit and auxiliary circuit.This direct voltage source is used to provide DC power supply.This drive circuit includes switch, first resistance, control signal generator, second resistance, diode and inductance.This switch has first end and is coupled to this direct voltage source, and second end is used for receiving control signal, and 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 first resistance has the 3rd end that first end is coupled to this switch, and second end.This control signal generator is coupled to first end and second end of this first resistance, is used for the voltage of this first resistance of sensing, to produce this control signal.This second resistance has first end that first end is coupled to this direct voltage source and this switch, and second end is coupled to this control signal generator.This diode has second end that first end is coupled to this first resistance, and second end is coupled to earth terminal.This inductance has second end that first end is coupled to this first resistance, and second end is coupled to load.This auxiliary circuit is to be parallel to this inductance, and it includes auxiliary capacitor and booster diode.This auxiliary capacitor has second end that first end is coupled to this first resistance, and second end is coupled to second end of this second resistance.This booster diode has second end that first end is coupled to this auxiliary capacitor, and second end is coupled to second end of this inductance.
Description of drawings
Fig. 1 is the schematic diagram of known buck direct current to dc voltage changer.
Fig. 2 is the schematic diagram of the direct-current power supply converting circuit of tool self-auxiliary source of the present invention and load open circuit and short-circuit protection function.
[main element label declaration]
10 direct currents are to dc voltage changer
102 switching transistors
20 direct-current power supply converting circuits
22 drive circuits
24 auxiliary circuits
100,200 direct voltage sources
202 switches
104,204,210 resistance
106,206,216 diodes
108,208 inductance
214 electric capacity
112,212 loads
110,26 control signal generators
114 linear voltage regulators
The Sc control signal
L1, L2, L3 road
2022,2024,2026 end points
The GND earth terminal
Vcc voltage
The Vin DC power supply
P1, P2 wiring
Embodiment
Please refer to Fig. 2, Fig. 2 has the schematic diagram of the direct-current power supply converting circuit 20 of self-auxiliary source and load open circuit and short-circuit protection function for the present invention.Direct-current power supply converting circuit 20 includes direct voltage source 200, load 212, drive circuit 22 and auxiliary circuit 24.Direct voltage source 200 is coupled to earth terminal GND, is used to provide DC power supply Vin.Load 212 is a light-emitting device, and (Light Emitting Diode LED) forms, and it also is coupled to earth terminal GND by at least one light-emitting diode usually.The composed component of drive circuit 22 is similar to the direct current of Fig. 1 to dc voltage changer 10, includes switch 202, first resistance 204, diode 206, inductance 208, second resistance 210 and control signal generator 26.Switch 202 is 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.Switch 202 be generally mos field effect transistor (metal-oxide-semiconductor field-effect transistor, MOSFET), its 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 bipolar junction transistor (Bipolar Junction Transistor, 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.Second resistance 210 is the resistance of high impedance, is used to provide the startup power supply of control signal generator 26.Diode 206 is generally pn and connects the surface semiconductor element, and the right-hand member among its Fig. 2 is the n utmost point and left end is the p utmost point.Inductance 208 is coupled to load 212, is used for storing or discharging the energy that direct voltage source 200 provides.Control signal generator 26 is generally pulse width modulator, is coupled to the two ends of first resistance 204, is used for the voltage of sensing first resistance 204 by this, to produce control signal Sc.According to the degree that the electric current of first resistance 204 changes, control signal generator 26 is adjusted control signal Sc, with the conducting of control switch 202 or close.
Direct-current power supply converting circuit 20 of the present invention is auxiliary circuit 24 in parallel on the inductance 208 of drive circuit 22.Auxiliary circuit 24 includes auxiliary capacitor 214 and booster diode 216.When auxiliary capacitor 214 starts in direct-current power supply converting circuit 20,, store the energy that direct voltage source 200 provides by second resistance 210.When the full electric energy of storage, auxiliary capacitor 214 promptly forms auxiliary voltage source, can provide stable boost voltage Vcc to control signal generator 26.Booster diode 216 is coupled between auxiliary capacitor 214 and the inductance 208, is used for when switch 202 conductings, prevents that the electric current inflow auxiliary circuit 24 of the power supply that direct voltage source 200 provides from causing the voltage of load 212 that unexpected change takes place.Booster diode 216 is same as diode 206 usually, has identical forward bias voltage drop, and the right-hand member among its Fig. 2 is the n utmost point and left end is the p utmost point.Direct-current power supply converting circuit 20 also comprises filter capacitor (not being shown in Fig. 2) and is coupled between earth terminal GND and the inductance 208, is used for filtering to export the noise of the electric current of load 212 to.
The operation principle of direct-current power supply converting circuit 20 of the present invention is as follows.At first, when direct-current power supply converting circuit 20 started, second resistance 210 downgraded DC power supply Vin to suitable voltage level, with start-up control signal generator 26, and provided energy to make energy storage usefulness to electric capacity 214 simultaneously.Control signal generator 26 is in starting the back by wiring P1 and P2, and constantly sensing passes through the electric current of first resistance 204, and changes according to electric current, the true control signal Sc that adjusts.Then, when switch 202 conductings, diode 206 and booster diode 216 all bear reverse bias, block loop L2 and loop L3 respectively.200 pairs of inductance 208 energy storage of direct voltage source, this moment, the electric current of first resistance 204 rose along with the electric current of inductance 208 is progressively past.When the electric current of resistance 204 rose to predetermined maximum, control signal generator 26 was by control signal Sc off switch 202.In case switch 202 cuts out, when diode 206 and booster diode 216 all operate on forward bias voltage drop, difference conducting loop L2 and L3.Because the power supply of direct voltage source 200 is blocked, the voltage that inductance 208 polarizations are opposite, carry energy simultaneously and give load 212 and auxiliary capacitor 214, make electric current acute variation can not take place by load 212, also can make auxiliary capacitor 214 keep stable voltage, keep the normal operation of control signal generator 26.Therefore, no matter under switch 202 conductings or the situation of closing, concerning control signal generator 26, auxiliary capacitor 214 as stable voltage source provide boost voltage Vcc to control signal generator 26.At last, when the electric current of first resistance 204 dropped to predetermined minimum value, control signal generator 26 was opened switch 202 by control signal Sc again, and the work that makes direct-current power supply converting circuit 20 is because of switch 202 conductings and close continuous circulation and go down.
In direct-current power supply converting circuit 20, if the voltage swing of load 212, inductance 208 and auxiliary capacitor 214 is respectively V
LD_, V
LAnd V
C, and, can draw relational expression according to loop L2 and L3:
V
LForward bias voltage drop+the V of=diode 216
LDForward bias voltage drop+the V of=diode 206
C
Because the forward bias voltage drop of the forward bias voltage drop of diode 216 and diode 206 much at one, the relational expression that can obtain at last between the voltage of load 212, inductance 208 and auxiliary capacitor 214 is: V
L=V
LD=V
CTherefore, if load 212 is short-circuited, then by above-mentioned relational expression V as can be known
L=V
LD=0 (Volt), then repid discharge of auxiliary capacitor 214.At this moment, change into by the resistance 210 of direct voltage source 200 by high impedance and provide boost voltage Vcc to control signal generator 26.Because the relation of the high impedance of resistance 210, boost voltage Vcc will become very low level, enough operating voltages can't be provided and make control signal generator 26 enter protected mode (hiccup), in the time of just and when starting and leave unused.In addition, if load 212 has the situation of open circuit to take place, then by above-mentioned relational expression V as can be known
LD=V
C, this moment, direct-current power supply converting circuit 20 can be by the voltage V of auxiliary capacitor 214
CJudge the voltage V of load 212
LDWhether too high.Control signal generator 26 can automatically be adjusted the ON time of switch 202 according to judged result, causes circuit to damage to prevent that load voltage is too high.Therefore; no matter load 212 is short-circuited or opens a way, and direct-current power supply converting circuit 20 can be adjusted the operating state of control signal generator 26 according to the boost voltage Vcc of auxiliary capacitor 214 outputs; with the turn-on frequency of in good time change switch 202, avoid damaging with protection direct-current power supply converting circuit 20.
In gross, in known technology, known direct-current power supply converting circuit is to utilize inefficient regulating circuit to provide working power to the signal controlling generator, causes known direct-current power supply converting circuit waste electric energy.With respect to known technology, the present invention be auxiliary circuit in parallel on inductance, make switch conduction or when closing, auxiliary circuit all can provide stable accessory power supply to the control signal generator, with the holding circuit normal operation.And when load was short-circuited or open circuit, the boost voltage that the present invention can provide by auxiliary circuit was adjusted the operating state of control signal generator, and to change the turn-on frequency of in good time change switch, prevention circuits is damaged because of load current is too high by this.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (12)
1. one kind has the self-auxiliary source and has load open circuit and the direct-current power supply converting circuit of short-circuit protection function, includes:
Direct voltage source is coupled to earth terminal, is used to provide DC power supply;
Drive circuit includes:
Switch has first end and is coupled to this direct voltage source, and second end is used for receiving control signal, and 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;
First resistance has the 3rd end that first end is coupled to this switch, and second end;
The control signal generator is coupled to first end and second end of this first resistance, is used for the voltage of this first resistance of sensing, to produce this control signal;
Second resistance has first end that first end is coupled to this direct voltage source and this switch, and second end is coupled to this control signal generator;
Diode has second end that first end is coupled to this first resistance, and second end is coupled to this earth terminal; And
Inductance has second end that first end is coupled to this first resistance, and second end is coupled to load; And
Auxiliary circuit is parallel to this inductance, includes:
Auxiliary capacitor has second end that first end is coupled to this first resistance, and second end is coupled to second end of this second resistance; And
Booster diode has second end that first end is coupled to this auxiliary capacitor, and second end is coupled to second end of this inductance.
2. direct-current power supply converting circuit according to claim 1, wherein the control signal generator is a pulse width modulator.
3. direct-current power supply converting circuit according to claim 1 wherein also comprises filter capacitor, is coupled between second end of second end of this diode and this inductance.
4. direct-current power supply converting circuit according to claim 1, wherein this switch is a mos field effect transistor.
5. direct-current power supply converting circuit according to claim 4, wherein this of this switch first end is drain electrode, this second end is a grid, and the 3rd end is a source electrode.
6. direct-current power supply converting circuit according to claim 1, wherein this switch is a bipolar junction transistor.
7. direct-current power supply converting circuit according to claim 6, wherein this of this switch first end is the 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 according to claim 1, wherein this of this diode first end is the n utmost point, this second end is the p utmost point.
9. direct-current power supply converting circuit according to claim 1, wherein this of this booster diode first end is the n utmost point, this second end is the p utmost point.
10. direct-current power supply converting circuit according to claim 1, wherein this diode is approximately identical with the forward bias voltage drop of this booster diode.
11. direct-current power supply converting circuit according to claim 1, wherein this second resistance resistance that is high impedance.
12. direct-current power supply converting circuit according to claim 1, wherein this load includes at least one light-emitting diode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82157806P | 2006-08-07 | 2006-08-07 | |
| US60/821,578 | 2006-08-07 |
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| Publication Number | Publication Date |
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| CN101123397A true CN101123397A (en) | 2008-02-13 |
| CN100527579C CN100527579C (en) | 2009-08-12 |
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| 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 After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101009060A Pending CN101123394A (en) | 2006-08-07 | 2007-04-28 | DC power conversion circuit having self-auxiliary power and self-protection |
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| Country | Link |
|---|---|
| CN (2) | CN100527579C (en) |
| TW (2) | TWI325675B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102214992A (en) * | 2010-04-01 | 2011-10-12 | 广鹏科技股份有限公司 | Constant current driving system for stably outputting current |
| CN102869148A (en) * | 2011-07-05 | 2013-01-09 | 登丰微电子股份有限公司 | Light-emitting diode driving circuit with open circuit protection |
| CN112564258A (en) * | 2019-09-06 | 2021-03-26 | 株式会社京滨 | Power control device |
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| US8488342B2 (en) | 2008-10-21 | 2013-07-16 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for constant voltage mode and constant current mode in flyback power converters with primary-side sensing and regulation |
| US8427075B2 (en) * | 2008-12-12 | 2013-04-23 | Microchip Technology Incorporated | Constant current output sink or source |
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| CN102769383B (en) | 2011-05-05 | 2015-02-04 | 广州昂宝电子有限公司 | System and method for constant-current control via primary side sensing and regulating |
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-
2006
- 2006-12-21 TW TW95148261A patent/TWI325675B/en active
- 2006-12-29 CN CNB2006101717958A patent/CN100527579C/en active Active
-
2007
- 2007-04-28 CN CNA2007101009060A patent/CN101123394A/en active Pending
- 2007-05-02 TW TW96115570A patent/TWI338994B/en active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214992A (en) * | 2010-04-01 | 2011-10-12 | 广鹏科技股份有限公司 | Constant current driving system for stably outputting current |
| CN102214992B (en) * | 2010-04-01 | 2013-12-18 | 安恩国际公司 | Constant current driving system for stably outputting current |
| CN102869148A (en) * | 2011-07-05 | 2013-01-09 | 登丰微电子股份有限公司 | Light-emitting diode driving circuit with open circuit protection |
| CN102869148B (en) * | 2011-07-05 | 2014-12-17 | 登丰微电子股份有限公司 | Light-emitting diode driving circuit with open circuit protection |
| TWI501692B (en) * | 2011-07-05 | 2015-09-21 | Green Solution Tech Co Ltd | Led driving circuit with open-circuit protection |
| CN112564258A (en) * | 2019-09-06 | 2021-03-26 | 株式会社京滨 | Power control device |
| CN112564258B (en) * | 2019-09-06 | 2023-08-25 | 日立安斯泰莫株式会社 | power control device |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI338994B (en) | 2011-03-11 |
| CN101123394A (en) | 2008-02-13 |
| TW200810334A (en) | 2008-02-16 |
| TW200810339A (en) | 2008-02-16 |
| CN100527579C (en) | 2009-08-12 |
| TWI325675B (en) | 2010-06-01 |
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