CN202050573U - LED (light-emitting diode) lamp control circuit with overvoltage protection function for key components - Google Patents
LED (light-emitting diode) lamp control circuit with overvoltage protection function for key components Download PDFInfo
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- CN202050573U CN202050573U CN2011201577234U CN201120157723U CN202050573U CN 202050573 U CN202050573 U CN 202050573U CN 2011201577234 U CN2011201577234 U CN 2011201577234U CN 201120157723 U CN201120157723 U CN 201120157723U CN 202050573 U CN202050573 U CN 202050573U
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Abstract
The utility model discloses an LED (light-emitting diode) lamp control circuit with an overvoltage protection function for key components. The LED lamp control circuit has the advantages of simple structure, reliable control and low cost and comprises an LED light source load (6), a rectification circuit (4) and a constant current circuit (7); wherein an alternating current is converted into a direct current by the rectification circuit (4); the constant current circuit (7) performs voltage stabilization and current stabilization for the LED light source load (6); the LED light source load (6) comprises at least one set of a plurality of LEDs which are connected in series; the constant current circuit (7) comprises at least one set of constant current power devices; each set of constant current power devices comprise at least one depletion mode field effect transistor; the drain of the depletion mode field effect transistor is a contact, and the source of the depletion mode field effect transistor is in a short circuit with the grid to form into another contact. Each set of the constant current devices are connected with a first voltage stabilization diode in parallel; and the voltage stabilization working point of the first voltage stabilization diode is a specific voltage between 20 V DC and 80 V DC. So that the LED lamp control circuit can be applicable to the field of LED lighting circuits.
Description
Technical field
The utility model relates to a kind of LED lamp control circuit with the key element over-voltage protecting function.
Background technology
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.Present LED illumination generally needs to adopt constant-current drive circuit, to provide galvanic current to LED, guarantees LED operate as normal and useful life, present constant-current drive circuit common configuration complexity.
The applicant once took the lead in depletion type MOS FET device application in the LED illumination driving circuit, provided the buffering of electric current with single device, guaranteed the LED current stabilization, was not hit, and had obtained good effect in actual applications.But in the environment that a plurality of LED light fixtures use simultaneously, if a plurality of light fixtures are opened simultaneously, can produce switching surge impacts, voltage can instantaneously fluctuate in a big way, in case instantaneous voltage is too high, then may impact, surpass self ability to bear of constant-current source device, then can cause constant-current source device to damage constant-current source.
In addition, the applicant also once combined radiator fan with the LED light fixture, utilize the radiator fan active heat removal, had brought good effect.But in the environment of a plurality of LED light fixtures, if a plurality of light fixture is opened simultaneously, also can produce switching surge and impact, voltage can instantaneously fluctuate in a big way, in case instantaneous voltage is too high, then may impact to fan, even cause fan to damage.
In sum, the key element in the LED lamp lighting circuit may cause damage owing to switching surge impacts, and causes the dead lamp of LED light fixture to be scrapped.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of LED lamp control circuit of simple in structure, control is reliable, cost is low band key element over-voltage protecting function is provided.
The technical scheme that the utility model adopted is: the utility model comprises the led light source load, alternating current is become galvanic rectification circuit, for voltage stabilizing is carried out in described led light source load, the constant-current circuit of current stabilization, described led light source load comprises at least one group of several LED that are in series, described constant-current circuit comprises at least one group of constant-current source device, every group of described constant-current source device comprises at least one depletion mode fet, the drain electrode of described depletion mode fet is a contact, the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact, every group of described constant-current source device all and be connected with first voltage stabilizing didoe, the voltage stabilizing working point of described first voltage stabilizing didoe is a specific voltage between 20～80V DC.
The LED lamp control circuit of described band key element over-voltage protecting function also comprises first temperature switch circuit; described first temperature switch circuit is connected to the input of power supply; described first temperature switch circuit comprises normally closed temperature detect switch (TDS); described normally closed temperature detect switch (TDS) is loaded on the radiator of described LED light fixture or a certain ad-hoc location in the light fixture; when the temperature of described ad-hoc location in radiator temperature or the light fixture is higher than the break-off signal of described normally closed temperature detect switch (TDS); described normally closed temperature detect switch (TDS) disconnects; cut off the power supply of described led light source load, the break-off signal of described normally closed temperature detect switch (TDS) is a specified temp between 60～100 ℃.
The LED lamp control circuit of described band key element over-voltage protecting function also comprises voltage stabilizing and pfc circuit, and described voltage stabilizing and pfc circuit be connected to after the described rectification circuit, before the described led light source load.
The LED lamp control circuit of described band key element over-voltage protecting function also comprises current foldback circuit, and described current foldback circuit is connected to the input of power supply, and described current foldback circuit comprises the overcurrent protection protective tube.
The LED lamp control circuit of described band key element over-voltage protecting function also comprises the power lightning protection circuit, and described power lightning protection circuit is connected to after described current foldback circuit and described first temperature switch circuit.
The LED lamp control circuit of described band key element over-voltage protecting function also comprises the EMC circuit, and described EMC circuit is connected to before the described rectification circuit, and described rectification circuit adopts bridge rectifier.
Every group of described constant-current source device is in series with at least one group of LED in the described led light source load and is connected.
The LED lamp control circuit of described band key element over-voltage protecting function also comprises light fixture fan electromotor, fan shunt circuit, second temperature switch circuit; after being in series, described second temperature switch circuit and described light fixture fan electromotor be in parallel with described fan shunt circuit again; described fan shunt circuit also is connected with second voltage stabilizing didoe, and the voltage stabilizing working point of described second voltage stabilizing didoe is a specific voltage between 6～24V DC.
Described fan shunt circuit comprises the shunt resistance that at least one and described second voltage stabilizing didoe are in parallel.
Described second temperature switch circuit comprises often drives temperature detect switch (TDS), when temperature is higher than the described closed temperature of often driving temperature detect switch (TDS), the described temperature detect switch (TDS) closure of often opening is described light fixture fan electromotor power supply, and the described closed temperature of often driving temperature detect switch (TDS) is a specified temp between 30～50 ℃.
The beneficial effects of the utility model are: because the utility model comprises the led light source load, alternating current is become galvanic rectification circuit, for voltage stabilizing is carried out in described led light source load, the constant-current circuit of current stabilization, described led light source load comprises at least one group of several LED that are in series, described constant-current circuit comprises at least one group of constant-current source device, every group of described constant-current source device comprises at least one depletion mode fet, the drain electrode of described depletion mode fet is a contact, the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact, every group of described constant-current source device all and be connected with first voltage stabilizing didoe, the voltage stabilizing working point of described first voltage stabilizing didoe is a specific voltage between 20～80V DC; Described constant-current source device is as an independent devices, and convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit makes circuit element significantly reduce, circuit is simple, cost is low; By described first voltage stabilizing didoe is set, make described constant-current source device voltage control within the specific limits, it is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage that causes, minimizing impacts to constant-current source, avoid constant-current source device to damage, guarantee the stable operation of entire circuit, so the utility model is simple in structure, control reliable, cost is low, band key element over-voltage protecting function;
Because the utility model also comprises first temperature switch circuit, described first temperature switch circuit is connected to the input of power supply, described first temperature switch circuit comprises normally closed temperature detect switch (TDS), described normally closed temperature detect switch (TDS) is loaded on the radiator of described LED light fixture or a certain ad-hoc location in the light fixture, when the temperature of described ad-hoc location in radiator temperature or the light fixture is higher than the break-off signal of described normally closed temperature detect switch (TDS), described normally closed temperature detect switch (TDS) disconnects, cut off the power supply of described led light source load, the break-off signal of described normally closed temperature detect switch (TDS) is a specified temp between 60～100 ℃; By the input that described first temperature switch circuit is connected to power supply is set, when a certain ad-hoc location is higher than the break-off signal of described normally closed temperature detect switch (TDS) in radiator temperature or the light fixture, described normally closed temperature detect switch (TDS) disconnects, cut off the power supply of described led light source load, when radiator temperature is lower than the break-off signal of described normally closed temperature detect switch (TDS), described normally closed temperature detect switch (TDS) is closed again, lighting LED throws light on, avoid LED to influence the life-span and scrap owing to overheated, prolong the useful life of LED, protection LED avoids high temperature and destroys, so the utility model is simple in structure, control is reliable, has the high temperature protection function;
Because the utility model also comprises the light fixture fan electromotor, the fan shunt circuit, second temperature switch circuit, after being in series, described second temperature switch circuit and described light fixture fan electromotor be in parallel with described fan shunt circuit again, described fan shunt circuit also is connected with second voltage stabilizing didoe, the voltage stabilizing working point of described second voltage stabilizing didoe is a specific voltage between 6～24V DC, described second temperature switch circuit comprises often drives temperature detect switch (TDS), when temperature is higher than the described closed temperature of often driving temperature detect switch (TDS), the described temperature detect switch (TDS) closure of often opening, be described light fixture fan electromotor power supply, the described closed temperature of often driving temperature detect switch (TDS) is a specified temp between 30～50 ℃; When temperature is higher than the described closed temperature of often driving temperature detect switch (TDS), the described temperature detect switch (TDS) closure of often opening, be described light fixture fan electromotor power supply, make fan running, carry out active heat removal, when temperature is lower than the described closed temperature of often driving temperature detect switch (TDS), the described temperature detect switch (TDS) of often opening disconnects, described light fixture fan electromotor does not turn round, and avoids waste and noise, also can avoid the icing drawback of bringing that starts by force of fan under the special low temperature situation; By described second voltage stabilizing didoe is set; make described light fixture fan electromotor voltage control within the specific limits; it is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage that causes; minimizing impacts to the light fixture fan electromotor; avoid fan to damage; guarantee the heat radiation stable operation of entire circuit, so the utility model also has low-temperature protection function and fan over-voltage protecting function.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model embodiment one;
Fig. 2 is the electrical block diagram of the utility model embodiment one;
Fig. 3 is the schematic block circuit diagram of the utility model embodiment two;
Fig. 4 is the electrical block diagram of the utility model embodiment two.
Embodiment
Embodiment one:
As Fig. 1; shown in Figure 2; comprise the radiator that is used for passive heat radiation in the LED light fixture of the band key element over-voltage protecting function of present embodiment; the LED lamp control circuit of band key element over-voltage protecting function comprises first temperature switch circuit 1; current foldback circuit 11; power lightning protection circuit 2; EMC circuit 3; voltage stabilizing and pfc circuit 5; led light source load 6; alternating current is become galvanic rectification circuit 4; for voltage stabilizing is carried out in described led light source load 6; the constant-current circuit 7 of current stabilization; described current foldback circuit 11 is connected to the input of power supply; described current foldback circuit 11 comprises overcurrent protection protective tube F1; the usefulness that is used for overcurrent and short-circuit protection; described power lightning protection circuit 2 is connected to after described current foldback circuit 11 and described first temperature switch circuit 1; the usefulness that is used for lightning protection; comprise piezo-resistance RV1; RV2; R2; thermistor RT; discharge tube DSA1; described EMC circuit 3 is connected to before the described rectification circuit 4; so that circuit meets the Electro Magnetic Compatibility requirement; comprise resistance R 1; capacitor C 1～C4; common mode inductance T1; described rectification circuit 4 adopts bridge rectifier; comprise four rectifier diode D1～D4; can certainly adopt other rectifier system rectifications; described voltage stabilizing and pfc circuit 5 are circuit of power factor correction; be connected to after the described rectification circuit 4; before the described led light source load 6; be used to described led light source load 6 that the voltage galvanic current is provided; and the power factor of raising entire circuit; described voltage stabilizing and pfc circuit 5 are Switching Power Supplies; comprise power factor correction chip U1; the model that described power factor correction chip U1 adopts ST company to produce is the power supply PFC power factor control circuit of L6561; it is simple that it has a circuit; the efficient advantages of higher; its peripheral cell comprises capacitor C 5～C8; C10; resistance R 3～R11; diode D5; D6; metal-oxide-semiconductor Q1; transformer T2; described first temperature switch circuit 1 is connected to the input of power supply; described first temperature switch circuit 1 comprises normally closed temperature detect switch (TDS) TH1; described normally closed temperature detect switch (TDS) TH1 is loaded on the radiator of described LED light fixture; when radiator temperature is higher than the break-off signal of described normally closed temperature detect switch (TDS) TH1; described normally closed temperature detect switch (TDS) TH1 disconnects; cut off the power supply of described led light source load 6; the break-off signal of described normally closed temperature detect switch (TDS) TH1 is 70 ℃; the break-off signal scope of described normally closed temperature detect switch (TDS) TH1 can be chosen to be certain specified temp between 60～100 ℃ according to the factors such as power of the condition of work of light fixture and side circuit; by the input that described first temperature switch circuit 1 is connected to power supply is set; when radiator temperature is higher than the break-off signal of described normally closed temperature detect switch (TDS) TH1; described normally closed temperature detect switch (TDS) TH1 disconnects; cut off the power supply of described led light source load 6; when radiator temperature is lower than the break-off signal of described normally closed temperature detect switch (TDS) TH1; described normally closed temperature detect switch (TDS) TH1 is closed again, lights LED and throws light on, and avoids LED to influence the life-span and scrap owing to overheated; prolong the useful life of LED; protection LED avoids high temperature and destroys, and therefore has the high temperature protection function, and described led light source load 6 comprises some groups of LED at least; be LED 1a～LED (n) a; LED 1x～LED (n) x; be in parallel between each group, comprise the LED that several are in series, the visual input voltage of the number n of every group of LED that is in series in each group; the height of rated power; the requirement of the size of light illumination and deciding; described constant-current circuit 7 comprises some groups of constant-current source devices; every group of described constant-current source device comprises a depletion mode fet Qa; Qx, each described depletion mode fet Qa; the drain electrode of Qx is a contact, each described depletion mode fet Qa; the source electrode of Qx and grid short circuit mutually constitute another contact; every group of described constant-current source device is in series with one group of LED in the described led light source load 6 and is connected; so that every group of LED can both obtain stable operating current, avoid overcurrent to burn, increase the service life; every group of described constant-current source device is depletion mode fet Qa; Qx all and be connected with the first voltage stabilizing didoe Da; Dx; the described first voltage stabilizing didoe Da; the voltage stabilizing working point of Dx can be chosen to be certain specific voltage between 20～80V DC according to the factors such as situation of the watt level of light fixture and side circuit, make described constant-current source device voltage control within the specific limits, it is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage that causes; minimizing impacts to constant-current source; avoid constant-current source device to damage, guarantee the stable operation of entire circuit, therefore have the key element over-voltage protecting function.
Embodiment two:
As Fig. 3; shown in Figure 4; the LED lamp control circuit of the band key element over-voltage protecting function of present embodiment can be applicable in the bulkhead lamp capable of freezer; comprise radiator fan that is used for active heat removal and the radiator that is used for passive heat radiation in the LED light fixture; the difference of itself and embodiment one is: present embodiment also comprises light fixture fan electromotor 10; fan shunt circuit 8; second temperature switch circuit 9; after being in series with described light fixture fan electromotor 10, described second temperature switch circuit 9 is in parallel with described fan shunt circuit 8 again; described fan shunt circuit 8 also is connected with the second voltage stabilizing didoe Dfan; the voltage stabilizing working point of the described second voltage stabilizing didoe Dfan can be chosen to be certain specific voltage between 6～24V DC according to the factors such as situation of the watt level of light fixture and side circuit; described fan shunt circuit 8 comprises two shunt resistance R12 that are in parallel with the described second voltage stabilizing didoe Dfan; be used for the shunting of high-power circuit; the high temperature of avoiding single resistance to bring; described second temperature switch circuit 9 comprises often opens temperature detect switch (TDS) TH2; when temperature is higher than the described closed temperature of often opening temperature detect switch (TDS) TH2; the described temperature detect switch (TDS) TH2 closure of often opening; be described light fixture fan electromotor 10 power supplies; make fan running; carry out active heat removal; when temperature is lower than the described closed temperature of often opening temperature detect switch (TDS) TH2; the described temperature detect switch (TDS) TH2 that often opens disconnects; described light fixture fan electromotor 10 does not turn round; avoid waste and noise; also can avoid the icing drawback of bringing that starts by force of fan under the special low temperature situation; the described closed temperature of often opening temperature detect switch (TDS) TH2 is 30 ℃; the described closed temperature scope cocoa of often opening temperature detect switch (TDS) TH2 is chosen to be a specified temp between 30～50 ℃ according to the factors such as temperature conditions of the environment for use of light fixture; by the described second voltage stabilizing didoe Dfan is set; make described light fixture fan electromotor 10 voltage control within the specific limits; it is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage that causes; minimizing impacts to light fixture fan electromotor 10; avoid fan to damage, guarantee the heat radiation stable operation of entire circuit.The LED lamp control circuit of the band key element over-voltage protecting function of present embodiment can be used for high temperature protection, low-temperature protection and overvoltage protection.
All the other features of present embodiment are identical with embodiment one.
Certainly; it is not unique position that described normally closed temperature detect switch (TDS) TH1 installs that normally closed temperature detect switch (TDS) TH1 described in the above embodiment is loaded on the radiator of described LED light fixture; also can described normally closed temperature detect switch (TDS) TH1 be installed on a certain other ad-hoc locations in the light fixture according to the power situation and the circuit heating situation of light fixture; such as being installed on the bigger triode of heating; when the temperature of described ad-hoc location in the light fixture is higher than the break-off signal of described normally closed temperature detect switch (TDS) TH1; described normally closed temperature detect switch (TDS) TH1 disconnects; cut off the power supply of described led light source load 6, realize the effect of protection.
In the utility model, described constant-current source device is as an independent devices, and convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit makes circuit element significantly reduce, circuit is simple, cost is low; By described first voltage stabilizing didoe and described second voltage stabilizing didoe are set; make described constant-current source device and fan voltage control within the specific limits; it is too high that the switching surge of avoiding a plurality of light fixtures to open generation simultaneously impacts the instantaneous voltage that causes; minimizing impacts to key element in the circuit; avoid key element to damage; guarantee the stable operation of entire circuit, so the utility model is simple in structure, control reliable, cost is low, band key element over-voltage protecting function.
The utility model can be widely used in LED lighting circuit field.
Claims (10)
1. LED lamp control circuit with the key element over-voltage protecting function; comprise led light source load (6); alternating current is become galvanic rectification circuit (4); for voltage stabilizing is carried out in described led light source load (6); the constant-current circuit of current stabilization (7); it is characterized in that: described led light source load (6) comprises at least one group of several LED that are in series; described constant-current circuit (7) comprises at least one group of constant-current source device; every group of described constant-current source device comprises at least one depletion mode fet; the drain electrode of described depletion mode fet is a contact; the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact; every group of described constant-current source device all and be connected with first voltage stabilizing didoe, the voltage stabilizing working point of described first voltage stabilizing didoe is a specific voltage between 20～80V DC.
2. the LED lamp control circuit of band key element over-voltage protecting function according to claim 1; it is characterized in that: the LED lamp control circuit of described band key element over-voltage protecting function also comprises first temperature switch circuit (1); described first temperature switch circuit (1) is connected to the input of power supply; described first temperature switch circuit (1) comprises normally closed temperature detect switch (TDS) (TH1); described normally closed temperature detect switch (TDS) (TH1) is loaded on the radiator of described LED light fixture or a certain ad-hoc location in the light fixture; when the temperature of described ad-hoc location in radiator temperature or the light fixture is higher than the break-off signal of described normally closed temperature detect switch (TDS) (TH1); described normally closed temperature detect switch (TDS) (TH1) disconnects; cut off the power supply of described led light source load (6), the break-off signal of described normally closed temperature detect switch (TDS) (TH1) is a specified temp between 60～100 ℃.
3. the LED lamp control circuit of band key element over-voltage protecting function according to claim 1; it is characterized in that: the LED lamp control circuit of described band key element over-voltage protecting function also comprises voltage stabilizing and pfc circuit (5), described voltage stabilizing and pfc circuit (5) be connected to described rectification circuit (4) afterwards, described led light source load (6) before.
4. the LED lamp control circuit of band key element over-voltage protecting function according to claim 1; it is characterized in that: the LED lamp control circuit of described band key element over-voltage protecting function also comprises current foldback circuit (11); described current foldback circuit (11) is connected to the input of power supply, and described current foldback circuit (11) comprises overcurrent protection protective tube (F1).
5. the LED lamp control circuit of band key element over-voltage protecting function according to claim 4; it is characterized in that: the LED lamp control circuit of described band key element over-voltage protecting function also comprises power lightning protection circuit (2), and described power lightning protection circuit (2) is connected to described current foldback circuit (11) and described first temperature switch circuit (1) afterwards.
6. the LED lamp control circuit of band key element over-voltage protecting function according to claim 1; it is characterized in that: the LED lamp control circuit of described band key element over-voltage protecting function also comprises EMC circuit (3); described EMC circuit (3) is connected to described rectification circuit (4) before, and described rectification circuit (4) adopts bridge rectifier.
7. the LED lamp control circuit of band key element over-voltage protecting function according to claim 1 is characterized in that: every group of described constant-current source device is in series with at least one group of LED in the described led light source load (6) and is connected.
8. according to the LED lamp control circuit of any described band key element over-voltage protecting function of claim 1 to 7; it is characterized in that: the LED lamp control circuit of described band key element over-voltage protecting function also comprises light fixture fan electromotor (10); fan shunt circuit (8); second temperature switch circuit (9); described second temperature switch circuit (9) is in parallel with described fan shunt circuit (8) after being in series with described light fixture fan electromotor (10) again; described fan shunt circuit (8) also is connected with second voltage stabilizing didoe (Dfan), and the voltage stabilizing working point of described second voltage stabilizing didoe (Dfan) is a specific voltage between 6～24V DC.
9. the LED lamp control circuit of band key element over-voltage protecting function according to claim 8 is characterized in that: described fan shunt circuit (8) comprises the shunt resistance (R12) that at least one and described second voltage stabilizing didoe (Dfan) are in parallel.
10. the LED lamp control circuit of band key element over-voltage protecting function according to claim 8; it is characterized in that: described second temperature switch circuit (9) comprises often drives temperature detect switch (TDS) (TH2); when temperature is higher than the described closed temperature of often driving temperature detect switch (TDS) (TH2); described temperature detect switch (TDS) (TH2) closure of often opening; be described light fixture fan electromotor (10) power supply, the described closed temperature of often driving temperature detect switch (TDS) (TH2) is a specified temp between 30～50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201577234U CN202050573U (en) | 2011-05-17 | 2011-05-17 | LED (light-emitting diode) lamp control circuit with overvoltage protection function for key components |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201577234U CN202050573U (en) | 2011-05-17 | 2011-05-17 | LED (light-emitting diode) lamp control circuit with overvoltage protection function for key components |
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| CN202050573U true CN202050573U (en) | 2011-11-23 |
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| CN2011201577234U Expired - Fee Related CN202050573U (en) | 2011-05-17 | 2011-05-17 | LED (light-emitting diode) lamp control circuit with overvoltage protection function for key components |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102307411A (en) * | 2011-05-17 | 2012-01-04 | 广州南科集成电子有限公司 | Light-emitting diode (LED) lamp control circuit having key element overvoltage protection function |
| CN103139961A (en) * | 2011-11-28 | 2013-06-05 | 东莞市福地电子材料有限公司 | Light-emitting dioxide (LED) high voltage power source |
| CN103533707A (en) * | 2013-09-30 | 2014-01-22 | 广州东霖电子有限公司 | Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit |
-
2011
- 2011-05-17 CN CN2011201577234U patent/CN202050573U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102307411A (en) * | 2011-05-17 | 2012-01-04 | 广州南科集成电子有限公司 | Light-emitting diode (LED) lamp control circuit having key element overvoltage protection function |
| CN103139961A (en) * | 2011-11-28 | 2013-06-05 | 东莞市福地电子材料有限公司 | Light-emitting dioxide (LED) high voltage power source |
| CN103139961B (en) * | 2011-11-28 | 2014-12-10 | 东莞市福地电子材料有限公司 | Light-emitting dioxide (LED) high voltage power source |
| CN103533707A (en) * | 2013-09-30 | 2014-01-22 | 广州东霖电子有限公司 | Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit |
| CN103533707B (en) * | 2013-09-30 | 2015-07-08 | 广州东霖电子有限公司 | Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit |
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Granted publication date: 20111123 Termination date: 20180517 |