CN203840591U - An LED drive circuit composed of discrete devices - Google Patents
An LED drive circuit composed of discrete devices Download PDFInfo
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- CN203840591U CN203840591U CN201420118831.4U CN201420118831U CN203840591U CN 203840591 U CN203840591 U CN 203840591U CN 201420118831 U CN201420118831 U CN 201420118831U CN 203840591 U CN203840591 U CN 203840591U
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Abstract
The utility model discloses an LED drive circuit composed of discrete devices. The LED drive circuit composed of the discrete devices comprises a filtering unit, a rectification unit and one or more LED. After an alternating current power supply input goes through the filtering unit and the rectification unit, a direct current voltage is obtained. The LED drive circuit also comprises a voltage transformer connected with the rectification unit, a first switch tube and a second switch tube. The first switch tube and the second switch tube are both field effect transistors. The first switch tube and the second switch tube both comprise grid electrodes, drain electrodes and source electrodes. The grid electrode of the first switch tube is connected with the drain electrode of the second switch tube. The drain electrode of the first switch tube is connected with the voltage transformer. The source electrode of the first switch tube is connected with the source electrode of the second switch tube through a detection resistor. The grid electrode of the second switch tube is connected with the source electrode of the first switch tube through a thermistor. According to the LED drive circuit composed of the discrete devices of the utility model, complex control lines are not needed and control integrated circuits are not needed. In addition, the switch tubes of the LED drive circuit composed of the discrete devices of the utility model are the field effect transistors, and a control switch tube is also a field effect transistor, so that a temperature drift is small and current changes are small.
Description
Technical field
The utility model relates to LED lighting technical field, particularly a kind of LED drive circuit that adopts discrete device composition.
Background technology
LED due to have energy-saving and environmental protection, can be light-operated, the lot of advantages such as solidification, long-life, be widely used in various lighting fields in the today of advocating low-carbon (LC) life.
In the prior art, the holder structure of LED lamp is generally designed to the holder structure identical with original illuminating lamp such as incandescent lamp, electricity-saving lamp, LED lamp directly can be replaced to original illuminating lamp like this, is not only convenient to install, and does not change the structure of original illuminator.But current existing LED Drive and Control Circuit is integrated circuit substantially, complicated structure.And the LED Drive and Control Circuit of general discrete device composition, what main switch mainly used is triode, what control main switch is also common triode, the working temperature of general LED lamp is higher, the shortcoming of this control mode is that temperature is floated greatly, LED output current is unstable, also has the efficiency of this control mode lower.
Summary of the invention
The utility model has overcome above-mentioned the deficiencies in the prior art, and a kind of LED drive circuit that adopts simple in structure, the temperature of discrete device composition to float little and outputting current steadily is provided.
The technical solution of the utility model is achieved in that
Adopt the LED drive circuit of discrete device composition, comprise filter unit, rectification unit and one or more LED, described LED drive circuit receives AC power input, after unit and rectification unit, obtain direct voltage after filtering, described LED drive circuit also comprises transformer, is connected with rectification unit; And: the first switching tube and second switch pipe, described the first and second switching tubes are field effect transistor, include grid, drain electrode and source electrode, the grid of described the first switching tube is connected with the drain electrode of second switch pipe, the drain electrode of the first switching tube is connected with transformer, the source electrode of the first switching tube detects resistance by one and is connected with the source electrode of second switch pipe, and the grid of second switch pipe is connected with the source electrode of the first switching tube by a thermistor.
As preferably, described transformer comprises main winding, output winding and auxiliary winding, and main winding is connected with rectification unit, and output winding is connected with LED, assists winding to be connected with first, second switching tube.
As preferably, described transformer comprises main winding and auxiliary winding, and main winding is connected with LED, and auxiliary winding is connected with first, second switching tube.
As preferably, described first, second switching tube is N-type field effect transistor.
As preferably, described thermistor adopts the resistance of PTC positive temperature coefficient resistor or NTC negative temperature coefficient to compensate.
As preferably, LED drive circuit also comprises the first resistance being connected between rectification unit and the first switching tube grid, and the voltage after rectification is given to the grid of the first switching tube after the first resistance step-down.
As preferably, described LED drive circuit also comprises anti-lightning strike piezo-resistance, and described piezo-resistance is in parallel with filter unit.
As preferably, described LED drive circuit also comprises can reduce the linear compensation resistance that causes LED output current to increase because voltage raises in the time that line voltage raises, one end of described linear compensation resistance connects rectification unit, and the other end connects the grid of second switch pipe.
As preferably, described LED drive circuit also comprises the first electric capacity, the second resistance and the 3rd resistance that are connected between the auxiliary winding of transformer and the first switching tube grid, wherein, and the 3rd resistance and the first capacitances in series, the second resistance and the first Capacitance parallel connection.
As preferably, described LED drive circuit also comprises the diode and the second electric capacity that are connected between transformer output winding and LED, and the second described electric capacity is in parallel with LED, the anodic bonding transformer output winding of diode, the negative electrode connection LED of diode.
As preferably, described LED drive circuit also comprises the capacitor in parallel with rectification unit.
Compared to prior art, the utility model adopts discrete electronic device composition LED Drive and Control Circuit, therefore without complicated control circuit, without control integration circuit.And switching tube of the present utility model is field effect transistor, control switch pipe be field effect transistor equally, temperature is floated little, curent change is little.
In addition, drive circuit of the present utility model also has temperature compensation function, makes up the shortcoming that discrete device control precision is not high, thereby makes output current more accurate.The utility model is without changing current wiring, not needing additional any peripheral dimmer switch or equipment, and directly by the function that can realize light modulation of dimmer on wall, cost is low, easy to use.
Brief description of the drawings
Fig. 1 is the structured flowchart of LED drive circuit in the utility model embodiment 1;
Fig. 2 is the structured flowchart of LED drive circuit in the utility model embodiment 2.
Embodiment
Embodiment of the present utility model is as follows:
Embodiment 1: Fig. 1 is the structured flowchart of the utility model LED drive circuit, in the present embodiment, LED drive circuit is buck-boost circuit, as shown in Figure 1, the utility model LED drive circuit is for driving LED lighting device, wherein, AC power 1 and dimmer 2 are existing structures in the market, and LED drive circuit of the present utility model comprises filter unit 4, rectification unit 5, transformer 6 and first, second switching tube 7,8.Between dimmer 2 and filter unit 4, be connected with fuse 3, be parallel with anti-lightning strike piezo-resistance 18 with filter unit 4.
Described transformer 6 comprises and the main winding a-c being connected of rectification unit 5, the output winding a-b being connected with LED lighting device and auxiliary winding d-e.In the present embodiment, described the first switching tube 7 is N-type field effect transistor, comprise grid, drain electrode and source electrode, described second switch pipe 8 is also N-type field effect transistor, comprise grid, drain electrode and source electrode, the grid of the first switching tube 7 is connected with the drain electrode of second switch pipe 8, the drain electrode of the first switching tube 7 is connected with the main winding a-c of transformer 6, the source electrode of the first switching tube 7 is connected with the source electrode of second switch pipe 8 by detecting resistance 9, and the grid of second switch pipe 8 is connected with the source electrode of the first switching tube 7 by thermistor 10.
Described LED drive circuit also comprises can reduce the linear compensation resistance 20,21 that causes LED output current to increase because voltage raises in the time that line voltage raises, one end of described linear compensation resistance 20,21 connects rectification unit, and the other end connects the grid of second switch pipe 8.Described LED drive circuit also comprises the first electric capacity 12, the second resistance 13 and the 3rd resistance 14 that are connected between the auxiliary winding d-e of transformer and the first switching tube 7 grids, wherein, the 3rd resistance 13 is connected with the first electric capacity 12, and the second resistance 13 is in parallel with the first electric capacity 12.LED drive circuit also comprises the first resistance 11 being connected between rectification unit 5 and the first switching tube 7 grids, and the voltage after rectification is given to the grid of the first switching tube 7 after the first resistance 11 step-downs.Described LED drive circuit also comprises the diode 15 and the second electric capacity 16 that are connected between transformer output winding a-b and LED, the second described electric capacity 16 is in parallel with LED, the anodic bonding transformer output winding a-b of diode 15, the negative electrode of diode 15 connects LED.
The concrete driving process of LED drive circuit of the present utility model is as follows: after energising, alternating voltage 1 is through dimmer 2 and fuse 3, LED drive circuit by input ac voltage signal after filtering inductance 4 carry out being rectified into direct current signal through rectification unit 5 again after filtering, voltage after rectification is given to the grid of the first switching tube 7 after the first resistance 11 step-downs, when voltage reaches after the cut-in voltage of grid of the first switching tube 7, the drain electrode of the first switching tube 7 and source electrode conducting, now the main winding a-c of transformer 6 is to the first switching tube 7 with detect and have electric current on resistance 9 and flow through, electric current is slope and rises, according to Faraday's electromagnetic induction law, now can on the auxiliary winding d-e of transformer 6, produce voltage, and be e pin positive voltage d pin negative voltage, e pin positive voltage is by the first electric capacity 12 and second, the 3rd resistance 13, 14 make the grid voltage of the first switching tube 7 continue to rise, the conduction impedance that makes to flow through the first switching tube 7 is less, electric current continues to increase, flow through the electric current detecting on resistance 9 the same as increase simultaneously, flow through the electric current detecting on resistance 9 and can form detection voltage, this voltage is given to the grid of second switch pipe 8 after thermistor 10.
When flowing through transformer 6 main winding a-c to the first switching tube 7 and detecting electric current on resistance 9 and arrive greatly certain amplitude, and make it possible to the cut-in voltage of the grid that reaches second switch pipe 8 at the voltage that detects formation on resistance 9, at this moment the drain electrode of second switch pipe 8 and source electrode conducting, making to flow through transformer 6 main winding a-c electric currents no longer increases, according to Faraday's electromagnetic induction law.Now the each winding of transformer 6 will produce back electromotive force, the e pin of transformer 6 produces negative voltage, second switch pipe 8 will be closed, transformer 6 is exported winding a-b and will the second electric capacity 16 be charged and LED is powered by diode 15, when the energy in transformer 6 discharges, now the each winding of transformer 6 can produce again back-emf, and the power supply of LED will maintain by the second electric capacity 16.The auxiliary winding d-e voltage reversal of transformer 6, e pin positive voltage d pin negative voltage, reopens the first switching tube 7 thereby e pin positive voltage makes the grid voltage of the first switching tube 7 continue to rise by the first electric capacity 12 and second, third resistance 13,14.What this circuit can go round and begin again repeats the above-mentioned course of work.
Because LED lamp working temperature is higher, thermistor 10 adopts the resistance of PTC positive temperature coefficient to compensate, in the time that temperature raises, the cut-in voltage step-down of the grid of second switch pipe 8, cause the main winding a-c that flows through transformer 6 to reduce to the electric current of the first switching tube 7, can cause like this output current of LED can reduce too.But the resistance of thermistor 10 becomes large in the time that temperature raises, can make like this grid voltage of second switch pipe 8 reduce, be the grid cut-in voltage that voltage is reached, flowing through main winding a-c needs to increase to the electric current of the first switching tube 7.Can make like this output current of LED increase, so add the thermistor 10 of PTC positive temperature coefficient to compensate because the cut-in voltage of the grid of second switch pipe 8 reduces the minimizing of the output current of the LED causing with temperature rising.The grid of second switch pipe 8 is connected with resistance 17, the other end ground connection of resistance 17.
The thermistor that we also can be using resistance 17 as NTC negative temperature coefficient equally, resistance 10 uses conventional, electric-resistance, and principle is the same.Resistance the 20, the 21st, linear compensation resistance, causes the increase of LED output current because voltage raises for reducing in the time that line voltage raises.
In the present embodiment, the concrete light modulation process of utilizing dimmer is as follows: in the time of external dimmer 2 (being mainly phase-cut dimming device), while carrying out brightness adjustment control, the knob of rotary dimmer, when dimmer phase place diminishes, on the capacitor 19 in parallel with rectification unit, voltage also can produce low frequency (general 100HZ or 120HZ left and right) cut, the envelope voltage that produces low frequency (general 100HZ or 120HZ left and right) on the auxiliary winding d-e of transformer 6 also can produce cut simultaneously, the output winding a-b low frequency envelope voltage of transformer 6 also can produce cut, so output energy diminishes, the second electric capacity 16 can be by average the electric current of output cut, after cut, the average current of LED output reduces thereupon.In the time that dimmer phase place becomes large, in like manner the output current of LED will increase.
Embodiment 2: Fig. 2 is the structured flowchart of the utility model LED drive circuit embodiment 2, as different from Example 1, in the present embodiment, LED drive circuit is buck circuit, as shown in Figure 2, the utility model LED drive circuit is for driving LED lighting device, wherein, AC power 1 and dimmer 2 are existing structures in the market, and LED drive circuit of the present utility model comprises filter unit 4, rectification unit 5, transformer 6 and first, second switching tube 7,8.
Described transformer 6 comprises the main winding a-c being connected with the first switching tube 7 and the auxiliary winding d-e being connected with second switch pipe 8.In the present embodiment, described the first switching tube 7 is N-type field effect transistor, comprise grid, drain electrode and source electrode, described second switch pipe 8 is also N-type field effect transistor, comprise grid, drain electrode and source electrode, the grid of the first switching tube 7 is connected with the drain electrode of second switch pipe 8, the drain electrode of the first switching tube 7 is connected with the main winding a-c of transformer 6, the source electrode of the first switching tube 7 is connected with the source electrode of second switch pipe 8 by detecting resistance 9, and the grid of second switch pipe 8 is connected with the source electrode of the first switching tube 7 by thermistor 10.
LED drive circuit shown in Fig. 2 is similar to the operation principle of Fig. 1:
Concrete driving process is as follows: after energising, alternating voltage 1 is through dimmer 2 and fuse 3, LED drive circuit by input ac voltage signal after filtering inductance 4 carry out being rectified into direct current signal through rectification unit 5 again after filtering, voltage after rectification is given to the grid of the first switching tube 7 after the first resistance 11 step-downs, when voltage reaches after the cut-in voltage of grid of the first switching tube 7, the drain electrode of the first switching tube 7 and source electrode conducting, now the main winding a-c of LED and transformer 6 is to the first switching tube 7 with detect and have electric current on resistance 9 and flow through, electric current is slope and rises, according to Faraday's electromagnetic induction law, now can on the auxiliary winding d-e of transformer 6, produce voltage, and be e pin positive voltage d pin negative voltage.
E pin positive voltage makes the grid voltage of the first switching tube 7 continue to rise by the first electric capacity 12 and second, third resistance 13,14, the conduction impedance that makes to flow through the first switching tube 7 is less, electric current continues to increase, flow through the electric current detecting on resistance 9 the same as increase simultaneously, flow through the electric current detecting on resistance 9 and can form detection voltage, this voltage is given to the grid of second switch pipe 8 after thermistor 10.When flowing through transformer 6 main winding a-c to the first switching tube 7 and detecting electric current on resistance 9 and arrive greatly certain amplitude, and the voltage forming on detection resistance makes it possible to the cut-in voltage of the grid that reaches second switch pipe 8, at this moment the drain electrode of second switch pipe 8 and source electrode conducting, making to flow through transformer 6 main winding a-c electric currents no longer increases, according to Faraday's electromagnetic induction law, now the each winding of transformer 6 will produce back electromotive force, the e pin of transformer 6 produces negative voltage, second switch pipe 8 will be closed, transformer 6 is exported winding a-c and will the second electric capacity 16 be charged and LED is powered by diode 15, when the energy in transformer 6 discharges, now the each winding of transformer 6 can produce again back-emf, the power supply of LED will maintain by the second electric capacity 16.The feedback winding d-e voltage reversal of transformer 6,5 pin positive voltage 4 pin negative voltages, thereby 5 pin positive voltages make the grid voltage of the first switching tube 7 continue to rise by the first electric capacity 12 and second, third resistance 13,14 and reopen the first switching tube 7, and what this circuit can go round and begin again repeats the above-mentioned course of work.
Because LED lamp working temperature is higher, thermistor 10 adopts the resistance of PTC positive temperature coefficient to compensate, the cut-in voltage step-down of the grid of field effect transistor 8 in the time that temperature raises, cause the main winding a-c that flows through transformer 6 to reduce to the electric current of field effect transistor 7, can cause like this output current of LED can reduce too.But the resistance of thermistor 10 becomes large in the time that temperature raises, can make like this grid voltage of field effect transistor 8 reduce, for making voltage reach the grid cut-in voltage of field effect transistor 8, flowing through main winding a-c needs to increase to the electric current of field effect transistor 7, can make like this output current of LED increase.So add the thermistor 10 of PTC positive temperature coefficient to compensate because the cut-in voltage of the grid of field effect transistor 8 reduces the minimizing of the output current of the LED causing with temperature rising.The thermistor that we also can be using resistance 17 as NTC negative temperature coefficient equally, resistance 10 uses conventional, electric-resistance.Principle is the same.Piezo-resistance 18 in circuit is piezo-resistances, is mainly anti-lightning strike effect, resistance the 20, the 21st, and linear compensation resistance, causes the increase of LED output current because voltage raises for reducing in the time that line voltage raises.
In the present embodiment, the concrete light modulation process of utilizing dimmer is as follows:
In the time of external dimmer 2 (being mainly phase-cut dimming device), while carrying out brightness adjustment control, the knob of rotary dimmer, when dimmer phase place diminishes, on capacitor 19, voltage also can produce low frequency (general 100HZ or 120HZ left and right) cut, and the envelope voltage that produces low frequency (general 100HZ or 120HZ left and right) simultaneously on Transformer Winding d-e also can produce cut.Output winding a-c low frequency envelope voltage also can produce cut, so output energy diminishes, the second electric capacity 16 can be by average the electric current of output cut, and after cut, the average current of LED output reduces thereupon.In the time that dimmer phase place becomes large, in like manner the output current of LED will increase.
The utility model preferred embodiment is just for helping to set forth the utility model.Preferred embodiment does not have all details of detailed descriptionthe, and also not limiting this utility model is only described embodiment.Obviously,, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present utility model and practical application, thereby under making, technical field technical staff can utilize the utility model well.The utility model is only subject to the restriction of claims and four corner and equivalent.Disclosed is above only several specific embodiments of the application, but the application is not limited thereto, and the changes that any person skilled in the art can think of, all should drop in the application's protection range.
Claims (11)
1. adopt the LED drive circuit of discrete device composition, comprise filter unit, rectification unit and one or more LED, described LED drive circuit receives AC power input, obtains direct voltage after filtering after unit and rectification unit, it is characterized in that: described LED drive circuit also comprises:
Transformer, is connected with rectification unit; And:
The first switching tube and second switch pipe, described the first and second switching tubes are field effect transistor, include grid, drain electrode and source electrode, the grid of described the first switching tube is connected with the drain electrode of second switch pipe, the drain electrode of the first switching tube is connected with transformer, the source electrode of the first switching tube detects resistance by one and is connected with the source electrode of second switch pipe, and the grid of second switch pipe is connected with the source electrode of the first switching tube by a thermistor.
2. the LED drive circuit of employing discrete device composition according to claim 1, it is characterized in that: described transformer comprises main winding, output winding and auxiliary winding, main winding is connected with rectification unit, and output winding is connected with LED, and auxiliary winding is connected with first, second switching tube.
3. the LED drive circuit of employing discrete device composition according to claim 1, is characterized in that: described transformer comprises main winding and auxiliary winding, and main winding is connected with LED, and auxiliary winding is connected with first, second switching tube.
4. the LED drive circuit of employing discrete device composition according to claim 1, is characterized in that: described first, second switching tube is N-type field effect transistor.
5. the LED drive circuit of employing discrete device composition according to claim 1, is characterized in that: described thermistor adopts the resistance of PTC positive temperature coefficient resistor or NTC negative temperature coefficient to compensate.
6. the LED drive circuit of employing discrete device composition according to claim 1, it is characterized in that: LED drive circuit also comprises the first resistance being connected between rectification unit and the first switching tube grid, the voltage after rectification is given to the grid of the first switching tube after the first resistance step-down.
7. the LED drive circuit of employing discrete device composition according to claim 1, is characterized in that: described LED drive circuit also comprises anti-lightning strike piezo-resistance, and described piezo-resistance is in parallel with filter unit.
8. the LED drive circuit of employing discrete device composition according to claim 1, it is characterized in that: described LED drive circuit also comprises can reduce the linear compensation resistance that causes LED output current to increase because voltage raises in the time that line voltage raises, one end of described linear compensation resistance connects rectification unit, and the other end connects the grid of second switch pipe.
9. the LED drive circuit of employing discrete device composition according to claim 1, it is characterized in that: described LED drive circuit also comprises the first electric capacity, the second resistance and the 3rd resistance that are connected between the auxiliary winding of transformer and the first switching tube grid, wherein, the 3rd resistance and the first capacitances in series, the second resistance and the first Capacitance parallel connection.
10. the LED drive circuit of employing discrete device composition according to claim 1, it is characterized in that: described LED drive circuit also comprises the diode and the second electric capacity that are connected between transformer output winding and LED, the second described electric capacity is in parallel with LED, the anodic bonding transformer output winding of diode, the negative electrode of diode connects LED.
The LED drive circuit of 11. employing discrete device compositions according to claim 1, is characterized in that: described LED drive circuit also comprises the capacitor in parallel with rectification unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420118831.4U CN203840591U (en) | 2014-03-14 | 2014-03-14 | An LED drive circuit composed of discrete devices |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420118831.4U CN203840591U (en) | 2014-03-14 | 2014-03-14 | An LED drive circuit composed of discrete devices |
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| CN203840591U true CN203840591U (en) | 2014-09-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103889116A (en) * | 2014-03-14 | 2014-06-25 | 浙江生辉照明有限公司 | LED driving circuit composed of discrete devices |
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2014
- 2014-03-14 CN CN201420118831.4U patent/CN203840591U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103889116A (en) * | 2014-03-14 | 2014-06-25 | 浙江生辉照明有限公司 | LED driving circuit composed of discrete devices |
| WO2015135319A1 (en) * | 2014-03-14 | 2015-09-17 | Zhejiang Shenghui Lighting Co., Ltd | Led power circuit using discrete components and configuration method |
| US9585208B2 (en) | 2014-03-14 | 2017-02-28 | Zhejiang Shenghui Lighting Co., Ltd | LED power circuit using discrete components and configuration method |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: LED driving circuit composed of discrete devices Effective date of registration: 20230302 Granted publication date: 20140917 Pledgee: Tongxiang Yunbei Investment Construction Co.,Ltd. Pledgor: ZHEJIANG SHENGHUI LIGHTING Co.,Ltd. Registration number: Y2023980033495 |
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Granted publication date: 20140917 |