CN103298204A - Silicon controlled dimming LED lamp driver with open circuit protection function - Google Patents
Silicon controlled dimming LED lamp driver with open circuit protection function Download PDFInfo
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- CN103298204A CN103298204A CN2013101406041A CN201310140604A CN103298204A CN 103298204 A CN103298204 A CN 103298204A CN 2013101406041 A CN2013101406041 A CN 2013101406041A CN 201310140604 A CN201310140604 A CN 201310140604A CN 103298204 A CN103298204 A CN 103298204A
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Abstract
The invention discloses a silicon controlled dimming LED lamp driver with an open circuit protection function. The silicon controlled dimming LED lamp driver with the open circuit protection function is characterized in that the silicon controlled dimming LED lamp driver with the open circuit protection function comprises a rectification and filter circuit, an oscillating circuit and an output circuit, the rectification and filter circuit is provided with an input end connected with an alternating current and a direct-current end with a positive electrode and a negative electrode, an output winding of the oscillating circuit is connected with a current circuit of a switching element in series and then is connected between the positive electrode and the negative electrode, the control electrode of the switching element is connected with the positive electrode through a voltage reduction network, an auxiliary winding is coupled with the output winding, one end of the auxiliary winding is connected to the voltage reduction network through an oscillating capacitor, and the oscillating circuit comprises a protective circuit capable of automatically reducing the voltage of the control electrode of the switching element. The silicon controlled dimming LED lamp driver with the open circuit protection function has the advantages that the structure of the oscillating circuit is reliable and stable, the auxiliary winding can be reused, on one hand the oscillating circuit can be used for self-oscillation positive feedback, one the other hand, the oscillating circuit can be used as a sensing element for voltage sampling achieved through open circuit protection, the number of elements is small, the structure is simple, debugging is convenient, and lower-cost schemes can be formed easily.
Description
Technical field
The present invention relates to a kind of power circuit, specifically is a kind of driver that applies to the suitable controllable silicon light modulation mode of semiconductor lamp, has open circuit protecting function.
Background technology
Along with technological progress, the advantage of led light source in illumination is used highlights gradually, on the one hand, its optical efficiency, color developing have have met or exceeded conventional light source such as incandescent lamp, gas discharge fluorescent lamp, on the other hand, its adjustability has bigger development space than conventional light source, is specially adapted to general illumination fields such as modern house, commerce.
But the light fixture that led light source is realized also has its obvious defects, considers led light source output semiconductor device, and its driving power needs low pressure usually, so the LED light fixture all can have corresponding driver.This quasi-driver often uses the power supply of on-off mode, for example comprises switch transformer, oscillating circuit, protective circuit etc., considers problems such as dimming function, precision and life-span, have in addition apply to IC.The general character of this class circuit is that circuit is complicated, and cost is higher, especially is difficult to promote the use of at middle low-power LED desk lamp with dimmer switch.
Summary of the invention
Complicated at existing Dimmable LED driver lines, the higher and problem that be difficult to promote at middle low-power LED desk lamp with dimmer switch of cost, the present invention proposes a kind of controllable silicon light modulation LED lamp driver with open-circuit-protection, and its technical scheme is as follows:
The controllable silicon light modulation LED lamp driver of band open-circuit-protection comprises:
One current rectifying and wave filtering circuit, this current rectifying and wave filtering circuit have the input that connects alternating current and band is anodal and the dc terminal of negative pole;
One oscillating circuit, the output winding of this oscillating circuit be connected to respectively between described positive pole and the negative pole after the current circuit of a switching device is connected; The control utmost point of this switching device is connected in described positive pole by a decompression network; Other has an ancillary coil and the coupling of described output winding, and an end of this ancillary coil is connected in the described decompression network by an oscillating capacitance; This oscillating circuit comprises a protective circuit, and this protective circuit comprises a voltage-stabiliser tube and a charging capacitor, and the two is series between the control utmost point and ground of described switching device; Described voltage-stabiliser tube is kept the voltage to earth of this control utmost point when this switching device conducting; When described output winding open circuit and during overvoltage, its induced electromotive force on described ancillary coil charge to described charging capacitor, thereby makes this switching device control pole tension decline that it is ended;
One output circuit is connected in described output winding, will export behind its both end voltage rectifying and wave-filtering; And
One freewheeling circuit, this freewheeling circuit is connected between described positive pole and the negative pole, comprises a resistance and an electric capacity of series connection
Wherein, the end that is connected with switching device of described output winding and the described ancillary coil end that connects negative pole is end of the same name.
Preferred person as the technical program can have following embodiment:
In the preferred embodiment, after being in series, described charging capacitor and a diode be parallel to described ancillary coil again, a termination negative pole of this charging capacitor wherein, and the negative pole of this diode connects the tie point of this ancillary coil and this oscillating capacitance; This charging capacitor links to each other with this diode cathode and a little is connected to the control utmost point of described switching device by described voltage-stabiliser tube forward.
In the preferred embodiment, described decompression network comprises at least two dropping resistors of series connection mutually, and one of them this dropping resistor is connected between the end of described positive pole and described oscillating capacitance; Another this dropping resistor is connected between the end and the described control utmost point of described oscillating capacitance.
In the preferred embodiment, also comprise a clipping circuit, this clipping circuit carries out current sample to the current circuit of this switching device, sets a slicing threshold value, described clipping circuit limits the voltage of the described control utmost point, makes the electric current of the current circuit of this switching device be no more than described slicing threshold value.In preferred embodiment, described clipping circuit comprises:
Sampling resistor is series between described switching device current circuit and the ground, and itself and switching device junction are sampled point; And
Adjust pipe, its base stage is connected in described sampled point by a biasing resistor, and its collector electrode of adjusting pipe is connected in the control utmost point of described switching device, its grounded emitter.
In the preferred embodiment, it is characterized in that: described output circuit comprises a half-wave rectifier diode and a filtering electrolysis; Described halfwave rectifier diode cathode is connected in the end that described output winding is connected with described switch output device; Its positive pole of described filtering electrolysis is connected with the negative pole of described halfwave rectifier diode, and its negative pole is connected with the positive pole of described dc terminal.
In the preferred embodiment, described current rectifying and wave filtering circuit comprises the π type filter network that a Qiao Dui is connected with its output, and the output of this π type filter network is described dc terminal.
The beneficial effect that the technical program is brought has:
1. oscillating circuit is simple in structure, and element is few, and reliable in structure is stable, easily forms lower cost solution;
2. ancillary coil obtains multiplexingly, on the one hand as the self-oscillation positive feedback, can be used as open-circuit-protection on the other hand to the sensing device of voltage sample.Component number is few, and is simple in structure, and debugging is convenient;
3. can directly refute the dimmer switch that connects traditional controllable silicon pm mode, can directly carry out light modulation and handle, applicability is good.
4. can use a little element to set up the power factor correction circuit, be fit to the scheme of middle low power High Power Factor.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing embodiment:
Fig. 1 is the physical circuit figure of one embodiment of the invention.
Embodiment
As shown in Figure 1, the circuit diagram of one embodiment of the invention.
This scheme is one refutes and is connected to civil power, and about 50V can be provided, the driving output of the LED of 200mA.It has a current rectifying and wave filtering circuit, this current rectifying and wave filtering circuit has comprised the π type filter network that bridge heap D1 and C1, C2 and L3 form, its input is that two AC ends of bridge heap D1 connect alternating current (civil power), and the two ends from C2, the output that is π type filter network has been exported the dc terminal of being with anodal and negative pole, minus earth.Also has an oscillating circuit, this oscillating circuit has a mutual inductor T1, its output winding is the right side coil of T1 and be connected to respectively between positive pole and the negative pole after the current circuit of a switching device Q1 is connected, Q1 is as switching device, its current circuit be source electrode and drain electrode form can be controlled current path; The control utmost point of switching device Q1, namely its grid is connected in positive pole by a decompression network; Decompression network comprises R5 in sequential series, R6 and R8 in the present embodiment.
The left side of mutual inductor T1 is ancillary coil, and itself and output winding are coupled, and the one end is connected in the decompression network by an oscillating capacitance C5, and present embodiment is connected in the tie point of R6 and R8; This oscillating circuit also comprises a protective circuit, and this protective circuit comprises a voltage-stabiliser tube D2 and a charging capacitor C6, and D2 and C6 are series between the control utmost point and ground of switching device Q1; Voltage-stabiliser tube D2 keeps the voltage to earth of the control utmost point when this switching device Q1 conducting; When the output winding among T1 open circuit and during overvoltage, inevitably, the induced electromotive force that obtains at ancillary coil can raise, this induced electromotive force ends it to charging capacitor C6 charging thereby this switching device Q1 control pole tension is descended.
Level has an output circuit behind output winding, this output circuit output winding will export J1 to, J2 behind its both end voltage rectifying and wave-filtering.The end that the end that output winding is connected with switching device Q1 and ancillary coil connect the dc terminal negative pole is end of the same name, as shown in the figure.
This programme also comprises a freewheeling circuit, and this freewheeling circuit comprises a resistance R 4 and a capacitor C 3 of series connection, is connected between the positive pole and negative pole of dc terminal, is used for keeping the light modulation electric current of external controllable silicon formula dimmer, makes dimming behavior stable.
As seen, this programme has constituted the LED lamp drive circuit of a band defencive function.By the pulsating dc voltage from current rectifying and wave filtering circuit, switching device pipe Q1 is opened in direct C5 charging in oscillating circuit, and the voltage of T1 ancillary coil induction makes the further conducting of switching device Q1; Along with the deficiency of Q1 drive current, withdraw from the saturation region rapidly and enter cut-off region, the T1 ancillary coil produces reverse induced voltage, and Q1 is turn-offed immediately.Open Q1 again through oscillating circuit again subsequently, so be concatenated to form self-oscillation and can obtain output current from output winding.The output circuit of level behind output winding can connect the LED load by J1J2 again.In the course of the work; if the situation of J1J2 end open circuit occurs; then the output winding both end voltage raises; inevitable ancillary coil both end voltage raises; thereby C6 two ends chargings, between the upper and lower positive voltage raises in its district, if the voltage to earth of D2 negative pole and C6 both end voltage difference are less than the shutoff voltage of Q1; then the behavior can impel Q1 to reach cut-off state fast, plays a protective role.
To sum up, this programme has tangible characteristics, and ancillary coil obtains multiplexing, as the self-oscillation positive feedback, can be used as open-circuit-protection on the other hand to the sensing device of voltage sample on the one hand.Component number is few, and is simple in structure, and debugging is convenient; On the other hand, this programme can directly be refuted the dimmer switch that connects traditional controllable silicon pm mode, can directly carry out light modulation and handle, and applicability is good.
Present embodiment also has some other characteristics:
After being in series, charging capacitor C6 and a diode D6 be parallel to ancillary coil again, the termination negative pole of C6, and the negative pole of D6 connects the tie point of ancillary coil and C5; C6 a little is connected to the control utmost point of switching device Q1 with anodal linking to each other of this D6 by voltage-stabiliser tube D2 forward; C6; D6 and ancillary coil have formed complete unidirectional charging and discharging circuit, and this protective circuit is simple in structure, have namely realized turn-offing the defencive function of Q1 with three resolution elements.
Decompression network comprises three dropping resistor R5 of series connection mutually, and R6 and R8 are between the end that is connected in series in anodal and oscillating capacitance C5 of R5 and R6; Another R8 is connected between the end and the control utmost point of C5, and the decompression network of this form is convenient to debugging and change, especially, can make switching device Q1 both be suitable for the scheme of metal-oxide-semiconductor, and also the scheme of available transistor is used instead, and is compatible good.
Present embodiment also comprises a clipping circuit, and this clipping circuit comprises the in parallel of sampling resistor R9 and R10, and this sampling resistor is series between switching device 1 current circuit and the ground, and itself and switching device Q1 junction are sampled point; One adjusts pipe Q2, and its base stage is connected in sampled point by a biasing resistor R14, and its collector electrode of adjusting pipe Q2 is connected in the control utmost point of switching device Q1, its grounded emitter.This clipping circuit carries out current sample to the current circuit of this switching device Q1, circuit has been set a slicing threshold value, clipping circuit limits the voltage of the control utmost point, make the electric current of the current circuit of this switching device Q1 be no more than the slicing threshold value, thereby the current waveform that makes the Q1 source electrode obtains restriction, has finally realized the correcting function of power factor, and the power factor correction of this scheme is simple in structure, only need 4 elements, the scheme of this middle low power can be arranged on the power factor more than 0.7.
The output circuit of this programme comprises a half-wave rectifier diode D5 and a filtering electrolysis C5; The D5 positive pole is connected in the end that output winding is connected with switch output device Q1; Its positive pole of C5 is connected with the negative pole of D5, and its negative pole is connected with the positive pole of dc terminal.
The above, only for preferred embodiment of the present invention, so can not limit scope of the invention process according to this, i.e. the equivalence of doing according to claim of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (7)
1. the controllable silicon light modulation LED lamp driver of band open-circuit-protection is characterized in that, comprising:
One current rectifying and wave filtering circuit, this current rectifying and wave filtering circuit have the input that connects alternating current and band is anodal and the dc terminal of negative pole;
One oscillating circuit, the output winding of this oscillating circuit be connected to respectively between described positive pole and the negative pole after the current circuit of a switching device is connected; The control utmost point of this switching device is connected in described positive pole by a decompression network; Other has an ancillary coil and the coupling of described output winding, and an end of this ancillary coil is connected in the described decompression network by an oscillating capacitance; This oscillating circuit comprises a protective circuit, and this protective circuit comprises a voltage-stabiliser tube and a charging capacitor, and the two is series between the control utmost point and ground of described switching device; Described voltage-stabiliser tube is kept the voltage to earth of this control utmost point when this switching device conducting; When described output winding open circuit and during overvoltage, its induced electromotive force on described ancillary coil charge to described charging capacitor, thereby makes this switching device control pole tension decline that it is ended;
One output circuit is connected in described output winding, will export behind its both end voltage rectifying and wave-filtering; And
One freewheeling circuit, this freewheeling circuit is connected between described positive pole and the negative pole, comprises a resistance and an electric capacity of series connection
Wherein, the end that is connected with switching device of described output winding and the described ancillary coil end that connects negative pole is end of the same name.
2. according to the controllable silicon light modulation LED lamp driver of the described band open-circuit-protection of claim 1, it is characterized in that: be parallel to described ancillary coil again after described charging capacitor and a diode are in series, a termination negative pole of this charging capacitor wherein, the negative pole of this diode connects the tie point of this ancillary coil and this oscillating capacitance; This charging capacitor links to each other with this diode cathode and a little is connected to the control utmost point of described switching device by described voltage-stabiliser tube forward.
3. according to the controllable silicon light modulation LED lamp driver of the described band open-circuit-protection of claim 1, it is characterized in that: described decompression network comprises at least two dropping resistors of series connection mutually, and one of them this dropping resistor is connected between the end of described positive pole and described oscillating capacitance; Another this dropping resistor is connected between the end and the described control utmost point of described oscillating capacitance.
4. according to the controllable silicon light modulation LED lamp driver of the described band open-circuit-protection of claim 1; it is characterized in that: also comprise a clipping circuit; this clipping circuit carries out current sample to the current circuit of this switching device; set a slicing threshold value; described clipping circuit limits the voltage of the described control utmost point, makes the electric current of the current circuit of this switching device be no more than described slicing threshold value.
5. according to the controllable silicon light modulation LED lamp driver of the described band open-circuit-protection of claim 4, it is characterized in that: described clipping circuit comprises:
Sampling resistor is series between described switching device current circuit and the ground, and itself and switching device junction are sampled point; And
Adjust pipe, its base stage is connected in described sampled point by a biasing resistor, and its collector electrode of adjusting pipe is connected in the control utmost point of described switching device, its grounded emitter.
6. according to the controllable silicon light modulation LED lamp driver of each described band open-circuit-protection in the claim 1 to 5, it is characterized in that: described output circuit comprises a half-wave rectifier diode and a filtering electrolysis; Described halfwave rectifier diode cathode is connected in the end that described output winding is connected with described switch output device; Its positive pole of described filtering electrolysis is connected with the negative pole of described halfwave rectifier diode, and its negative pole is connected with the positive pole of described dc terminal.
7. according to the controllable silicon light modulation LED lamp driver of the described band open-circuit-protection of claim 6, it is characterized in that: described current rectifying and wave filtering circuit comprises the π type filter network that a Qiao Dui is connected with its output, and the output of this π type filter network is described dc terminal.
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| CN201310140604.1A CN103298204B (en) | 2013-04-22 | 2013-04-22 | With the controllable silicon light modulation LED lamp driver of open-circuit-protection |
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| CN201310140604.1A CN103298204B (en) | 2013-04-22 | 2013-04-22 | With the controllable silicon light modulation LED lamp driver of open-circuit-protection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104797044A (en) * | 2015-04-03 | 2015-07-22 | 厦门佰明光电有限公司 | LED dimming driving circuit and LED dimming driving method |
| CN107920406A (en) * | 2017-12-07 | 2018-04-17 | 厦门恩耐照明技术有限公司 | A kind of open loop protection circuit in self-maintained circuit |
| CN107995748A (en) * | 2017-12-28 | 2018-05-04 | 广州爱易学智能信息科技有限公司 | The temperature protection circuit of classroom blackboard LED light strip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107995748A (en) * | 2017-12-28 | 2018-05-04 | 广州爱易学智能信息科技有限公司 | The temperature protection circuit of classroom blackboard LED light strip |
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| CN103298204B (en) | 2015-08-12 |
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