CN209845375U - Output current control circuit for LED driver - Google Patents
Output current control circuit for LED driver Download PDFInfo
- Publication number
- CN209845375U CN209845375U CN201920054469.1U CN201920054469U CN209845375U CN 209845375 U CN209845375 U CN 209845375U CN 201920054469 U CN201920054469 U CN 201920054469U CN 209845375 U CN209845375 U CN 209845375U
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- Prior art keywords
- circuit
- resistor
- voltage
- light source
- current control
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- 238000001514 detection method Methods 0.000 claims abstract description 40
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 230000009466 transformation Effects 0.000 claims description 13
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 230000001131 transforming effect Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model discloses an output current control circuit for LED driver, including power module, switch circuit and the LED light source module that connects gradually, still include load detection circuitry, load detection circuitry includes vary voltage circuit, sampling circuit and detection circuitry, sampling circuit with LED light source module meets, detection circuitry is according to the voltage of sampling circuit output and control switch circuit's break-make and control power module's output; the voltage changing circuit provides power to the sampling circuit. The utility model discloses an effective benefit lies in: the driver can automatically match required voltage and current according to different resistance value information in the lamp, one driver can match a plurality of different LED lamps, and due to the fact that the driver is provided with the switch circuit, the damage to the LED lamps caused by overlarge output voltage in the power-on process of the driver can be avoided.
Description
Technical Field
The utility model relates to a circuit field, in particular to output current control circuit for LED driver.
Background
As a novel green light source product, the LED has the characteristics of energy conservation, environmental protection, long service life and small volume, and based on the advantages, the LED lamp manufactured by the LED is widely applied to various aspects of the society.
Most of traditional LED lamps are connected with lamps by using different external LED drivers, each type of the traditional LED lamps is matched with one lamp or similar lamps, and due to different working voltages and currents, the possibility that the lamps cannot work or are burnt out can occur in any matching; in yet a small portion of LED fixtures, some LED drivers may be matched to different fixtures; there is also a small part that when the driver has a function of matching a plurality of different lamps, but the driver cannot match a lamp with a relatively small operating voltage, such as a relatively small LED lamp, the LED lamp is damaged due to the excessive voltage.
Disclosure of Invention
The utility model discloses an overcome above-mentioned prior art at least one kind defect (not enough), provide an output current control circuit for LED driver.
In order to solve the technical problem, the technical scheme of the utility model as follows:
the output current control circuit for the LED driver comprises a power supply module, a switch circuit, an LED light source module and a load detection circuit, wherein the power supply module, the switch circuit and the LED light source module are sequentially connected, the load detection circuit comprises a voltage transformation circuit, a sampling circuit and a detection circuit, the sampling circuit is connected with the LED light source module in parallel, and the detection circuit controls the on-off of the switch circuit and controls the output power of the power supply module according to the voltage output by the sampling circuit; the voltage changing circuit provides power to the sampling circuit.
Furthermore, the detection circuit comprises a signal output end connected with the power module, a switch control end connected with the switch circuit and a voltage detection end connected with the sampling circuit.
Further, the sampling circuit comprises a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with the output end of the voltage transformation circuit, and the other end of the first resistor is connected with the negative electrode of the power supply module through the second resistor; one end of the third resistor is connected to a node between the first resistor and the second resistor, and the other end of the third resistor is connected to a voltage detection end of the detection circuit; the second resistor is also connected with the LED light source module in parallel.
Further, the second resistor is arranged inside the LED light source module.
Furthermore, the voltage input end of the voltage transformation circuit is connected with the anode of the power supply module, and the voltage output end of the voltage transformation circuit is connected with the first resistor.
Further, the switch circuit comprises a fourth resistor, a fifth resistor, a first MOS transistor and a second MOS transistor; the grid electrode of the first MOS tube is connected with the switch control end of the detection circuit, the source electrode of the first MOS tube is grounded, and the drain electrode of the first MOS tube is connected with the anode of the power supply module through a fifth resistor and a fourth resistor which are connected in series; and the grid electrode of the second MOS tube is connected to a node between the fourth resistor and the fifth resistor, the source electrode of the second MOS tube is connected with the anode of the power supply module, and the drain electrode of the second MOS tube is connected with the LED light source module.
Further, the sampling circuit further comprises a diode and a voltage stabilizing diode; the anode of the diode is connected with the voltage output end of the voltage transformation circuit, and the cathode of the diode is connected with the first resistor; and the anode of the voltage stabilizing diode is connected with the cathode of the power module, and the cathode of the voltage stabilizing diode is connected with the third resistor.
Further, the detection voltage of the voltage transformation circuit is smaller than the working voltage of the LED light source module.
Furthermore, the voltage transformation circuit is a three-phase voltage stabilization chip.
The utility model discloses an effective benefit lies in: the driver can automatically match required voltage and current according to different resistance value information in the lamp, one driver can match a plurality of different LED lamps, and due to the fact that the driver is provided with the switch circuit, the damage to the LED lamps caused by overlarge output voltage in the power-on process of the driver can be avoided.
Drawings
Fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is a control circuit diagram of the present embodiment.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar parts; the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Examples
The embodiment discloses an output current control circuit for an LED driver, as shown in fig. 1-2, which includes a power module 1, a switch circuit 2, an LED light source module 3, and a load detection circuit 4, where the load detection circuit 4 includes a voltage transformation circuit 41, a sampling circuit 42, and a detection circuit 43, the sampling circuit 42 is connected in parallel with the LED light source module 3, and the detection circuit 43 controls the on-off of the switch circuit 2 and the output power of the power module 1 according to the voltage output by the sampling circuit 42; the transformer circuit 41 supplies power to the sampling circuit 42.
Specifically, the detection circuit 43 is composed of a signal output terminal, a switch control terminal and a voltage detection terminal, wherein the signal output terminal is connected to the power module 1, the switch control terminal is connected to the switch circuit 2, and the voltage detection terminal is connected to the output terminal of the sampling circuit 42.
The sampling circuit 42 is used for collecting current and voltage information of the LED lamp, and includes a first resistor R1, a second resistor R2, and a third resistor R3, wherein one end of the first resistor R1 is connected to the voltage output end of the voltage transformation circuit 41, and the other end is connected to the negative electrode of the power module 1 through the second resistor R2. Specifically, the third resistor R3 is used as the output terminal of the sampling circuit 42, one end of the third resistor R3 is connected to the node between the first resistor R1 and the second resistor R2, and the other end is connected to the voltage detection terminal of the detection circuit 43; further, since the LED light source module is replaceable and different types of LED light source modules have different powers, in order to accurately identify the power of the LED light source module, the second resistor R2 is disposed inside the LED light source module 3 and connected in parallel with the LED light source module 3.
In this embodiment, the voltage input terminal of the transformer circuit 41 is connected to the positive electrode of the power module 1, the transformer circuit 41 is used to provide the detection voltage for the LED light source module 3, and specifically, in order to ensure that the transformer circuit 41 can provide a stable and suitable power, in this embodiment, the transformer circuit 41 is preferably a three-phase voltage stabilization chip U1.
In this embodiment, the switch circuit 2 includes a fourth resistor R4, a fifth resistor R5, a first MOS transistor Q1 and a second MOS transistor Q2, wherein a gate of the first MOS transistor Q1 is connected to a switch control end of the detection circuit 43, a source is grounded, a drain is connected to an anode of the power module 1 through a fifth resistor R5 and a fourth resistor R4 connected in series, a gate of the second MOS transistor Q2 is connected to a node between the fourth resistor R4 and the fifth resistor R5, the source is connected to the anode of the power module 1, and the drain is connected to an input end of the LED light source module 3. Whether the power module 1 supplies power to the LED light source module 3 normally or not is achieved through the switching action of the first MOS tube Q1 and the second MOS tube Q2.
In this embodiment, the sampling circuit 42 further includes a diode D1 and a zener diode ZD1, an anode of the diode D1 is connected to a voltage output terminal of the three-phase zener chip U1, and a cathode of the diode D1 is connected to the first resistor R1; the anode of the voltage-stabilizing diode ZD1 is connected with the output end of the LED light source module 3, and the cathode of the voltage-stabilizing diode ZD1 is connected with the third resistor R3; specifically, the diode D1 is used to block the voltage flowing backward after the driver normally works to burn out the three-phase voltage regulator chip U1, and the voltage regulator diode ZD1 is used to protect the detection circuit, so as to avoid the pulse interference of the high voltage on the electrical connection line between the power module 1 and the LED light source module 3.
The working principle of the utility model is as follows: after the driver is driven, the first MOS transistor Q1 and the second MOS transistor Q2 are in an off state, the power module 1 cuts off direct power supply to the LED light source module 3, the three-phase voltage stabilization chip U1 provides a fixed low voltage to the LED light source module 3, because the low voltage is lower than the working voltage of the LED light source module 3, the LED lamp is not lighted, the second resistor R2 is used as a resistor for identifying the power of the LED light source module and is placed in parallel inside the LED light source module 3, so as to realize accurate identification of different LED light source modules, after the low voltage is divided by the first resistor R1 and the second resistor R2, the voltage is input to the voltage detection end through the third resistor R3, the voltage of the second resistor R2 is detected, because the first resistor R1 is a fixed resistor, the low voltage provided by the three-phase voltage stabilization chip U1 is a fixed voltage signal, the current flowing through the first resistor R1 and the second resistor R2 is calculated, therefore, the resistance value of the second resistor R2 is calculated, the detection circuit 43 takes the resistance value of the second resistor R2 as a unique information mark, the signal output end of the detection circuit 43 outputs a pulse width signal of voltage and current corresponding to the information mark and transmits the signal to the signal receiving end of the power module 1, so that the power module 1 adjusts the working voltage required by the LED lamp, in addition, the opening control end of the detection circuit 43 outputs high level, that is, the node voltage of the gate of the first MOS transistor Q1 is at a high level, and at this time, the first MOS transistor Q1 is turned on, and after the conduction current is divided by the fourth resistor R4 and the fifth resistor R5, the grid node voltage of the second MOS transistor Q2 is lowered, the second MOS transistor Q2 is turned on at the moment, the adjusted voltage of the power supply module 1 can be directly transmitted to the LED light source module 3, the driver is finally matched with the LED light source module 3 in a self-adaptive mode, and the lighting of the LED lamp is achieved.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The output current control circuit for the LED driver comprises a power supply module (1), a switch circuit (2) and an LED light source module (3) which are sequentially connected, and is characterized by further comprising a load detection circuit (4), wherein the load detection circuit (4) comprises a voltage transformation circuit (41), a sampling circuit (42) and a detection circuit (43), the sampling circuit (42) is connected with the LED light source module (3) in parallel, and the detection circuit (43) controls the on-off of the switch circuit (2) and controls the output power of the power supply module (1) according to the voltage output by the sampling circuit (42); the transformer circuit (41) supplies power to the sampling circuit (42).
2. The output current control circuit for an LED driver according to claim 1, wherein the detection circuit (43) comprises a signal output terminal connected to the power supply module (1), a switch control terminal connected to the switch circuit (2), and a voltage detection terminal connected to the sampling circuit (42).
3. The output current control circuit for an LED driver of claim 1, wherein the sampling circuit (42) comprises a first resistor (R1), a second resistor (R2), and a third resistor (R3); one end of a first resistor (R1) is connected with the output end of the voltage transformation circuit (41), and the other end of the first resistor (R1) is connected with the negative electrode of the power supply module (1) through a second resistor (R2); one end of the third resistor (R3) is connected to a node between the first resistor (R1) and the second resistor (R2), and the other end is connected to a voltage detection end of the detection circuit (43); the second resistor (R2) is also connected in parallel with the LED light source module (3).
4. The output current control circuit for an LED driver according to claim 3, wherein the second resistor (R2) is placed inside the LED light source module (3).
5. The output current control circuit for the LED driver according to claim 3, wherein a voltage input terminal of the transforming circuit (41) is connected to the positive electrode of the power module (1), and a voltage output terminal is connected to the first resistor (R1).
6. The output current control circuit for the LED driver according to claim 1, wherein the switch circuit (2) comprises a fourth resistor (R4), a fifth resistor (R5), a first MOS transistor (Q1) and a second MOS transistor (Q2); the grid electrode of the first MOS tube (Q1) is connected with the switch control end of the detection circuit (43), the source electrode is grounded, and the drain electrode is connected with the anode of the power supply module (1) through a fifth resistor (R5) and a fourth resistor (R4) which are connected in series; the grid electrode of the second MOS tube (Q2) is connected to a node between the fourth resistor (R4) and the fifth resistor (R5), the source electrode of the second MOS tube is connected with the anode of the power supply module (1), and the drain electrode of the second MOS tube is connected with the LED light source module (3).
7. The output current control circuit for an LED driver of claim 3, wherein said sampling circuit (42) further comprises a diode (D1) and a zener diode; the anode of the diode (D1) is connected with the voltage output end of the voltage transformation circuit (41), and the cathode of the diode is connected with a first resistor (R1); the anode of the voltage-stabilizing diode (ZD 1) is connected with the cathode of the power supply module (1), and the cathode of the voltage-stabilizing diode is connected with the third resistor (R3).
8. The output current control circuit for the LED driver according to claim 1, wherein the detection voltage of the transformer circuit (41) is smaller than the operating voltage of the LED light source module (3).
9. The output current control circuit for the LED driver according to claim 5, wherein the transformation circuit (41) is a three-phase voltage stabilization chip (U1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920054469.1U CN209845375U (en) | 2019-01-14 | 2019-01-14 | Output current control circuit for LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920054469.1U CN209845375U (en) | 2019-01-14 | 2019-01-14 | Output current control circuit for LED driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209845375U true CN209845375U (en) | 2019-12-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920054469.1U Expired - Fee Related CN209845375U (en) | 2019-01-14 | 2019-01-14 | Output current control circuit for LED driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209845375U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112867199A (en) * | 2021-01-15 | 2021-05-28 | 上海彪狼照明电器有限公司 | LED driver device and LED lamp |
| CN115066062A (en) * | 2022-08-22 | 2022-09-16 | 江西嘉捷鑫源科技有限公司 | Lamp area control circuit, lamp area controller and lamp area system |
-
2019
- 2019-01-14 CN CN201920054469.1U patent/CN209845375U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112867199A (en) * | 2021-01-15 | 2021-05-28 | 上海彪狼照明电器有限公司 | LED driver device and LED lamp |
| CN115066062A (en) * | 2022-08-22 | 2022-09-16 | 江西嘉捷鑫源科技有限公司 | Lamp area control circuit, lamp area controller and lamp area system |
| CN115066062B (en) * | 2022-08-22 | 2022-11-15 | 江西嘉捷鑫源科技有限公司 | Lamp area control circuit, lamp area controller and lamp area system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191224 |