CN203086784U - LED driving circuit and LED illuminating device - Google Patents
LED driving circuit and LED illuminating device Download PDFInfo
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- CN203086784U CN203086784U CN 201220682159 CN201220682159U CN203086784U CN 203086784 U CN203086784 U CN 203086784U CN 201220682159 CN201220682159 CN 201220682159 CN 201220682159 U CN201220682159 U CN 201220682159U CN 203086784 U CN203086784 U CN 203086784U
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- circuit
- voltage
- led drive
- drive circuit
- diode
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Abstract
The utility model provides an LED driving circuit and an LED illuminating device. The LED driving circuit comprises a leakage circuit, which can be used to receive an input voltage and to output a starting voltage; and a control circuit, which comprises a power supply end, and can be started after the starting voltage is received by the power supply end. The leakage circuit comprises a starting circuit, which can be used to output the starting voltage to the control circuit; a voltage reduction circuit, which can be used to output a voltage reduction signal to the starting circuit during the working of the control circuit. The LED driving circuit is provided with the good light modulation performance and the good temperature performance.
Description
Technical field
The utility model relates to a kind of led drive circuit and uses the LED lighting device of this led drive circuit, more specifically, relates to a kind of LED lighting device that has the led drive circuit of good dimming characteristic and temperature characterisitic and use this led drive circuit.
Background technology
In recent years, LED replaces incandescent lamp and Halogen lamp LED more and more and is applied to fields such as illumination, yet, because LED is not to be pure resistive load as incandescent lamp and Halogen lamp LED, therefore when being applied to the dimmer that is generally used for incandescent lamp and Halogen lamp LED and electronic transformer, need the matching problem of solution between them.
Leadage circuit (bleeder circuit) is used to the dimmer supply of current.Usually, in led drive circuit, use bigger VCC electric capacity.In order to shorten the start-up time of led drive circuit, when starting, leadage circuit is used to, change by transformer and supply electric power to control IC after led drive circuit starts to control IC supply electric power, correspondingly turn-offs the supply of electric power of leadage circuit to control IC this moment.Yet, in actual use, when very little and/or temperature is higher when the light modulation angle of dim signal, leadage circuit can occurs and continue situation to control IC supply electric power.The element over-temperature that this makes in the leadage circuit might cause component failure.
The utility model content
In order to address the above problem, the utility model proposes a kind of led drive circuit and use the LED lighting device of this led drive circuit, can guarantee leadage circuit after control IC starts no longer to control IC supply electric power, no matter and the height of the size at light modulation angle and temperature.
According to an execution mode of the present utility model, a kind of led drive circuit is provided, it comprises: leadage circuit, receive input voltage, and the output starting resistor; And control circuit, comprising feeder ear, control circuit receives starting resistor at the feeder ear place and starts, and wherein, leadage circuit comprises: start-up circuit, to control circuit output starting resistor; And reduction voltage circuit, at control circuit duration of work output buck signal to start-up circuit.
In this embodiment, after control circuit started, the voltage that uses reduction voltage circuit to reduce leadage circuit was exported, thereby even under very little light modulation angle or high temperature, also can guarantee leadage circuit no longer to the control circuit supply capability, thereby guarantee that element is not damaged in the leadage circuit.
Preferably, reduction voltage circuit comprises: the 3rd diode, its negative pole end are the outputs of step-down signal, and its positive terminal is connected to earthing potential; And transistor seconds, its control electrode receives the control signal from control circuit, and its reference electrode is connected to described earthing potential, and its work electrode is connected to the negative pole end of the 3rd diode.
Preferably, control signal is from the MCU in the control circuit, DSP or PWM control IC.
Preferably, the 3rd diode is a voltage stabilizing didoe.
Preferably, reduction voltage circuit comprises negative tempperature coefficient thermistor.
Preferably, start-up circuit comprises: first resistance, and the one termination is received input voltage; First diode, its negative pole end is connected to the other end of first resistance; The first transistor, its control electrode are connected to the node between first resistance and first diode, and its reference electrode receives input voltage, and its work electrode is connected to the positive terminal of second diode; And second diode, its negative pole end is connected to control circuit, and wherein, reduction voltage circuit is connected between the positive terminal and earthing potential of first diode.
Preferably, first diode is a voltage stabilizing didoe.
Preferably, leadage circuit also comprises: bleeder circuit receives earial drainage signal from control circuit with leakage current.
Preferably, bleeder circuit comprises: second resistance, one end are connected to the earial drainage end of start-up circuit, and its other end is connected to earthing potential; The 3rd resistance, one end are connected to the earial drainage end of start-up circuit; And the 3rd transistor, its control electrode receives earial drainage signal, and its reference electrode is connected to earthing potential, and its work electrode is connected to the other end of the 3rd resistance.
Preferably, led drive circuit also comprises: voltage regulator, be connected to feeder ear, and start the back at control circuit and power to control circuit.
Preferably, voltage regulator receives the electric power from the ancillary coil of transformer.
Preferably, voltage regulator is a linear voltage regulator.
Preferably, control circuit comprises the PWM control IC, and feeder ear is the power supply terminal of PWM control IC.
Preferably, led drive circuit also comprises: rectification circuit be direct voltage with ac voltage rectifier, and output dc voltage is as input voltage.
According to another execution mode of the present utility model, a kind of LED lighting device is provided, it can comprise: according to the led drive circuit of above-mentioned execution mode of the present utility model; And LED, luminous by the driving of led drive circuit.
According to the led drive circuit of above-mentioned execution mode use reduction voltage circuit forbid leadage circuit at the control circuit duration of work to the control circuit output voltage, thereby guaranteed that leadage circuit is not damaged, obtained the LED lighting device that has the led drive circuit of good dimming characteristic and temperature characterisitic and use this led drive circuit.
Description of drawings
Fig. 1 is the circuit diagram that illustrates according to the led drive circuit of first execution mode of the present utility model;
Fig. 2 is the circuit diagram that illustrates according to the variation of the led drive circuit of first execution mode; And
Fig. 3 is the circuit diagram that illustrates according to the led drive circuit of second execution mode of the present utility model.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing, in the accompanying drawings, same or analogous reference marker is represented same or analogous parts.
Fig. 1 shows the led drive circuit 1 according to first execution mode of the present utility model.As shown in Figure 1, led drive circuit 1 comprises leadage circuit 11, control circuit 12 and rectification circuit 13.
When control circuit 12 starts, transistor Q1, diode D2 conducting, the VCC terminal of control IC 121 obtains V
N1-V
ThVoltage, and based on this voltage starting.Wherein, V
N1Be the current potential at node N1 place, V
ThBe the threshold voltage of transistor Q1, ignored the pressure drop of diode D2 herein.After control IC 121 started, the ancillary coil 141 by transformer provided voltage V to the VCC terminal
B, because voltage V
BThe starting resistor V that is higher than the negative pole end of diode D2
S, therefore make diode D2 be turned off, leadage circuit 11 stops to control circuit 12 supply electric power.
At control circuit 12 duration of works, exist leadage circuit 11 still to the situation of the feeder ear VCC of control circuit 12 output current.For example, when high temperature, because diode D1 has positive temperature coefficient usually, transistor Q1 has negative temperature coefficient, and this makes node N1 place voltage raise, and the threshold voltage V of Q1
ThReduce.As a result, the voltage V at node N2 place
N1-V
ThRaise, diode D2 is by conducting once more.In this case, electric current flows through transistor Q1, diode D2 arrival VCC terminal.There is the possibility of damaging because of overheated in transistor Q1.Again for example, when the light modulation angle very hour, be derived from the voltage V of ancillary coil 141
BReduce, make transistor Q1, diode D2 conducting, this also makes transistor Q1 exist because of overheated damages possible.
For avoiding the generation of above-mentioned situation, in according to the led drive circuit 1 of first execution mode, adopt negative tempperature coefficient thermistor R
NTCDrag down the voltage at node N1 place.Particularly, when temperature raises, negative tempperature coefficient thermistor R
NTCThe voltage at two ends descends, and exports a step-down signal to diode D1 thus, to compensate the both end voltage rising that diode D1 causes because of having positive temperature coefficient.Guaranteed that thus leadage circuit 11 is no longer to control circuit 12 output powers.
More than show negative tempperature coefficient thermistor R as an example of reduction voltage circuit 112
NTC, but be not limited thereto, as long as can be at the light modulation angle during very little and/or high temperature compensation diode D1 change in voltage or drag down the circuit structure of the voltage at node N1 place.For example, reduction voltage circuit 112 can comprise a plurality of elements with negative temperature coefficient, and perhaps, reduction voltage circuit can comprise adjustable resistance.
Fig. 2 shows a variation according to the led drive circuit 1 of first execution mode.Below only describe in detail and difference, be repeated in this description and omit according to the led drive circuit 1 of first execution mode.
As shown in Figure 2, led drive circuit 2 also comprises voltage regulator 142, and the one end is connected to the ancillary coil 141 of transformer, and the other end is connected to the VCC terminal of control IC 121.Thereby after control IC 121 started, voltage regulator 142 raise from the voltage of ancillary coil 141, and the voltage V that has raise to the output of the VCC of control IC 121 terminal
B, guarantee this voltage V thus
BVoltage V greater than node N2 place
AThereby, turn-off diode D2.This is very hour particularly useful at the light modulation angle.Preferably, voltage regulator 142 is linear voltage regulators.
Fig. 2 shows voltage regulator 142 and by negative tempperature coefficient thermistor R
NTCThe situation that the reduction voltage circuit 112 that constitutes is used in combination, but be not limited thereto.Also in working voltage adjuster 142 and the reduction voltage circuit 112 only.
Yet, also have weak point according to the led drive circuit 1,2 of first execution mode and variation thereof.For example, using negative tempperature coefficient thermistor R
NTCSituation under, the input voltage characteristic can be by deterioration.Under the situation of working voltage adjuster 142, because the output voltage of ancillary coil 141 can change according to the size at light modulation angle, so voltage regulator 142 needs to guarantee when ancillary coil 141 is exported minimum voltages voltage V
BAlso can be greater than voltage V
A, but this makes when ancillary coil 141 output maximum voltages voltage V
BMuch larger than voltage V
A, therefore, working voltage adjuster 142 has not only increased circuit cost, and efficient is comparatively low.
As further improvement, Fig. 3 shows the led drive circuit 3 according to second execution mode of the present utility model.Below only describe in detail and difference, be repeated in this description and omit according to the led drive circuit 1 of first execution mode.
As shown in Figure 3, reduction voltage circuit 311 comprises diode D3 and transistor Q2.The negative pole end of diode D3 is connected to the positive terminal of diode D1, and the positive terminal of diode D3 is connected to earthing potential.Diode D3 is preferably voltage stabilizing didoe.The grid of transistor Q2 receives the control signal from control circuit 12, and its source electrode is connected to earthing potential, and its drain electrode is connected to the node between diode D3 and the diode D1.
When control circuit 12 started, transistor Q2 turn-offed, the voltage V at node N1 place
N1Provide by diode D3 and diode D1, at this moment the voltage V at node N2 place
AEnough high with start-up control IC121.After control IC 121 started, the grid of transistor Q2 received from the control signal of control circuit 12 and conducting, and diode D3 is by short circuit, thus the voltage V at node N1 place
N1Be reduced to the voltage drop on the diode D1.Thus, guaranteed the voltage V at node N2 place
ABe lower than voltage V by ancillary coil 141 supplies
B, leadage circuit 31 is not to control circuit 12 supply electric power.
The control signal from control circuit 12 that grid received of transistor Q2 can be the control signal from MCU or DSP, also can be the control signal from the gate drivers terminal of PWM control IC, or other enable signals.
As shown in Figure 3, reduction voltage circuit 311 also comprises resistance R 4, R5 and capacitor C 1.One end of resistance R 4 is connected to the grid of transistor Q2, and the other end is connected to the control signal receiving terminal.One end of resistance R 5 is connected to earthing potential, and the other end is connected to the control signal receiving terminal.One end of capacitor C 1 is connected to the grid of transistor Q2, and the other end is connected to earthing potential.Can suitably select the parameter value of resistance R 4, R5 and capacitor C 1 according to circuit specification and design requirement, to be complementary with control signal.
In led drive circuit 3 according to second execution mode, forbidden promptly that by the element (diode D3, transistor Q2) that only increases seldom leadage circuit 31 starts the back at control circuit 12 and continues output voltage, therefore very little to the circuit cost influence.And circuit is realized easily and is reliable.
Although not shown, in led drive circuit 3, also voltage regulator 142 can be set according to second execution mode, this can guarantee that control circuit 12 can work in bigger scope range of the fluctuation of voltage.
Led drive circuit 1,2,3 according to above-mentioned execution mode and variation thereof can be used in combination with the existing dimmer that is used for incandescent lamp and Halogen lamp LED, and the LED with good dimming characteristic and temperature characterisitic can be provided lighting device.
Although this illustrate and described specific embodiment, but what it should be understood by one skilled in the art that is, under the prerequisite that does not deviate from scope of the present utility model, the specific embodiment that various execution modes optional and/or that be equal to can replace institute to describe and illustrate.The application is intended to cover any modification or the distortion of specific embodiment discussed herein.So the utility model is intended to only be limited by claim and equivalent thereof.
Reference numeral
1,2,3LED drive circuit 11 leadage circuits
12 control circuits, 113 start-up circuits
111 bleeder circuits, 112,311 reduction voltage circuits
142 voltage regulators, 141 ancillary coils
13 rectification circuits
Claims (15)
1. a led drive circuit (1) is characterized in that, comprising:
Leadage circuit (11) receives input voltage (V
In), and output starting resistor (V
S); And
Control circuit (12) comprises feeder ear (VCC), and described control circuit (12) locates to receive described starting resistor (V at described feeder ear (VCC)
S) and start,
Wherein, described leadage circuit (11) comprising:
Start-up circuit (113) is exported described starting resistor (V to described control circuit (12)
S); And
Reduction voltage circuit (112,311), at described control circuit (12) duration of work output buck signal to described start-up circuit (113).
2. led drive circuit according to claim 1 (1) is characterized in that, described reduction voltage circuit (311) comprising:
The 3rd diode (D3), its negative pole end are the outputs of described step-down signal, and its positive terminal is connected to earthing potential; And
Transistor seconds (Q2), its control electrode receives the control signal from described control circuit (12), and its reference electrode is connected to described earthing potential, and its work electrode is connected to the negative pole end of described the 3rd diode (D3).
3. led drive circuit according to claim 2 (1) is characterized in that, described control signal is from MCU, DSP in the described control circuit (12) or PWM control IC.
4. led drive circuit according to claim 2 (1) is characterized in that, described the 3rd diode (D3) is a voltage stabilizing didoe.
5. led drive circuit according to claim 1 (1) is characterized in that, described reduction voltage circuit (112) comprises negative tempperature coefficient thermistor (R
NTC).
6. according to each described led drive circuit (1) in the claim 1 to 5, it is characterized in that described start-up circuit (113) comprising:
First resistance (R1), one termination are received described input voltage (V
In);
First diode (D1), its negative pole end are connected to the other end of described first resistance (R1);
The first transistor (Q1), its control electrode are connected to the node between described first resistance (R1) and described first diode (D1), and its reference electrode receives described input voltage (V
In), its work electrode is connected to the positive terminal of second diode (D2); And
Described second diode (D2), its negative pole end are connected to described control circuit (12),
Wherein, described reduction voltage circuit (112,311) is connected between the positive terminal and earthing potential of described first diode (D1).
7. led drive circuit according to claim 6 (1) is characterized in that, described first diode (D1) is a voltage stabilizing didoe.
8. according to each described led drive circuit (1) in the claim 1 to 5, it is characterized in that described leadage circuit (11) also comprises:
Bleeder circuit (111) receives the earial drainage signal (S from described control circuit (12)
Sw) with leakage current.
9. led drive circuit according to claim 8 (1) is characterized in that, described bleeder circuit (111) comprising:
Second resistance (R2), one end are connected to the earial drainage end of described start-up circuit (113), and its other end is connected to earthing potential;
The 3rd resistance (R3), one end are connected to the earial drainage end of described start-up circuit (113); And
The 3rd transistor (Q3), its control electrode receive described earial drainage signal (S
Sw), its reference electrode is connected to described earthing potential, and its work electrode is connected to the other end of described the 3rd resistance (R3).
10. according to each described led drive circuit (1) in the claim 1 to 5, it is characterized in that, also comprise:
Voltage regulator (142) is connected to described feeder ear (VCC), starts the back at described control circuit (12) and powers to described control circuit (12).
11. led drive circuit according to claim 9 (1) is characterized in that, described voltage regulator (142) receives the electric power from the ancillary coil (141) of transformer.
12. led drive circuit according to claim 9 (1) is characterized in that, described voltage regulator (142) is a linear voltage regulator.
13. according to each described led drive circuit (1) in the claim 1 to 5, it is characterized in that described control circuit (12) comprises the PWM control IC, described feeder ear (VCC) is the power supply terminal of described PWM control IC.
14. according to each described led drive circuit (1) in the claim 1 to 5, it is characterized in that, also comprise:
Rectification circuit (13) is a direct voltage with ac voltage rectifier, and exports described direct voltage as described input voltage (V
In).
15. a LED lighting device is characterized in that, comprising:
According to each described led drive circuit (1) in the claim 1 to 14; And
LED, luminous by the driving of described led drive circuit (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 201220682159 CN203086784U (en) | 2012-12-11 | 2012-12-11 | LED driving circuit and LED illuminating device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 201220682159 CN203086784U (en) | 2012-12-11 | 2012-12-11 | LED driving circuit and LED illuminating device |
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CN203086784U true CN203086784U (en) | 2013-07-24 |
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CN 201220682159 Expired - Fee Related CN203086784U (en) | 2012-12-11 | 2012-12-11 | LED driving circuit and LED illuminating device |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018192468A1 (en) * | 2017-04-21 | 2018-10-25 | Tridonic Gmbh & Co Kg | Startup control circuit |
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2012
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018192468A1 (en) * | 2017-04-21 | 2018-10-25 | Tridonic Gmbh & Co Kg | Startup control circuit |
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---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20181211 |
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CF01 | Termination of patent right due to non-payment of annual fee |