CN217037512U - High-power LED current controller based on constant voltage source control - Google Patents
High-power LED current controller based on constant voltage source control Download PDFInfo
- Publication number
- CN217037512U CN217037512U CN202220422619.1U CN202220422619U CN217037512U CN 217037512 U CN217037512 U CN 217037512U CN 202220422619 U CN202220422619 U CN 202220422619U CN 217037512 U CN217037512 U CN 217037512U
- Authority
- CN
- China
- Prior art keywords
- power
- pin
- conversion chip
- led
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to an LED current controller, in particular to a high-power LED current controller based on constant voltage source control, which is convenient to use and is characterized by being provided with a DC/DC conversion circuit and an LED current adjusting circuit, wherein the LED current adjusting circuit comprises an LED lamp string and a high-power adjustable resistor; the DC/DC conversion circuit is internally provided with a DC/DC conversion chip, wherein a filter capacitor C4 is connected between a power input VIN and a reference ground, VIN is input to a pin 2 of the DC/DC conversion chip, a pin 3 of the DC/DC conversion chip is suspended, a filter capacitor C5 is connected between a pin 4 of the DC/DC conversion chip and the reference ground, one end of a capacitor C1 is connected with a pin 1 of the DC/DC conversion chip, the other end of the C1 is connected with a pin 8, and the pin 8 of the DC/DC conversion chip is connected with a power diode D1 and a power inductor L1; the utility model has the advantages that the main element is only one DC-DC chip, the used discrete elements are easy to replace and maintain, the cost is lower, and the utility model is suitable for the high-power current source LED controller.
Description
Technical Field
The utility model relates to an LED current controller, in particular to a high-power LED current controller based on constant voltage source control, which has high output power, is simple, is convenient to maintain and is convenient to use.
Background
In today's LED technology, one of the key factors affecting LED lifetime is the current stability of the LED. The constant current circuit can be designed to provide stable current for the LED. However, the price of the constant current source is high, the design of the constant current source of the integrated IC is complex, and the maintenance is inconvenient.
Disclosure of Invention
In order to overcome the problems and the defects in the prior art, the utility model provides the high-power LED current controller based on the constant voltage source control, which is simple and easy to use, has the remarkable advantages of good heat dissipation, low cost, high reliability, high power and the like, and is beneficial to commercialization.
The utility model is achieved by the following measures:
a high-power LED current controller based on constant voltage source control is characterized by being provided with a DC/DC conversion circuit and an LED current adjusting circuit, wherein the LED current adjusting circuit comprises an LED lamp string and a high-power adjustable resistor; the DC/DC conversion circuit is internally provided with a DC/DC conversion chip, wherein a filter capacitor C4 is connected between a power input VIN and a reference ground, VIN is input to a pin 2 of the DC/DC conversion chip, a pin 3 of the DC/DC conversion chip is suspended, a filter capacitor C5 is connected between a pin 4 of the DC/DC conversion chip and the reference ground, one end of a capacitor C1 is connected with a pin 1 of the DC/DC conversion chip, the other end of the C1 is connected with a pin 8, and the pin 8 of the DC/DC conversion chip is connected with a power diode D1 and a power inductor L1; one end of the output of the power inductor is connected with a filter capacitor C2, the output of the filter capacitor C2 is VOUT voltage, a network formed by connecting a pin 6 of a DC/DC conversion chip in series with a capacitor C3 and a resistor R1 is connected with a network of a capacitor C6, an LED lamp string is connected with the output voltage of VOUT, and the LED lamp string is connected to a power resistor R2.
The pin 5 of the DC/DC conversion chip is a reference voltage source and is a stable voltage, namely the stable voltage is on the power resistor R2.
The DC/DC conversion circuit comprises a DC-DC main chip and peripheral discrete elements, the output of the DC/DC conversion circuit is set to be constant voltage, current flows into the power resistor through the LED lamp string and then flows back to the reference ground, the voltage on the power resistor is constant and can be obtained by ohm law, and the current flowing through the power resistor is only inversely proportional to the resistance value of the power resistor. Therefore, the resistance value of the power resistor can be adjusted to set the current of the LED, and the driving implementation principle of the LED current controller is realized.
The utility model has the advantages that the main element is only one DC-DC chip, the used discrete elements are easy to replace and maintain, the cost is lower, and the utility model is suitable for the high-power current source LED controller.
Description of the drawings:
fig. 1 is a circuit schematic of the present invention.
The specific implementation mode is as follows:
fig. 1 is a schematic circuit diagram of a specific embodiment of a high-power LED current controller based on constant-voltage power control according to the present invention, wherein the DC-DC conversion circuit is mainly composed of a DC-DC conversion chip, and peripheral discrete components are added, and the discrete components include a capacitor, a resistor, a power inductor and a power diode; the LED current adjusting circuit consists of an LED lamp string and a power resistor; the peripheral discrete components of the DC-DC conversion circuit include, but are not limited to, the following: an input filter capacitor C4, a bypass capacitor C5 of a pin 4 of the DC-DC chip, a capacitor C1 between a pin 1 and a pin 8 of the DC-DC chip, a capacitor-resistor network connected with the pin 6: c3, R1 and C6, an output power network D1, L1 and an output filter capacitor C2; the LED current adjusting circuit comprises an LED light string, a power resistor, an output power supply and an LED current adjusting circuit, wherein the LED light string is provided with at least one high-power LED lamp bead, the positive pole of the LED light string circuit is connected with the negative pole of the previous stage, the positive pole of the lamp bead closest to the output power supply is connected with VOUT, and the negative pole of the lamp bead of the lowest stage is connected with one end of the power resistor; the model of the DC-DC chip is TPS54331 DR; the power resistor can be a chip packaging power resistor, a direct-insertion power resistor or a high-power adjustable resistor; the enable pin 3 of the DC-DC chip can be implemented in two ways: connect VIN or suspend.
A filter capacitor C4 is connected between a power supply input VIN and a reference ground, and VIN is input to a pin 2 of the DC-DC chip. The 3-pin of the DC-DC chip is suspended. A filter capacitor C5 is connected between the pin 4 and the reference ground. Connected to pin 1 is one terminal of a capacitor C1, the other terminal of C1 is connected to pin 8, and pin 8 is connected to a power diode D1 and a power inductor L1. One end of the output end of the power inductor is connected with the filter capacitor C2, and the output end of the filter capacitor C2 outputs VOUT voltage. The 6 pins of the DC-DC are connected with a network formed by serially connecting a capacitor C3, a resistor R1 and a capacitor C6. Connected to the VOUT output voltage is a LED string that is ultimately connected to a power resistor R2.
The working process of the utility model is as follows: when the system is powered on, the DC-DC controller acts, the current on the power resistor R2 starts to increase from 0, the feedback network in the DC-DC judges whether the voltage of the power resistor R2 is equal to the voltage value set by the comparator in the DC-DC, if not, the voltage is continuously adjusted in the DC-DC controller, the process is the process of current increase, and when the starting is finished, the voltage of the power resistor reaches the set value, namely the current on the power resistor reaches the set value. After the process is finished, the constant current control of the LED also achieves the aim.
The utility model has the advantages that the main element is only one DC-DC chip, the used discrete elements are easy to replace and maintain, the cost is lower, and the utility model is suitable for the high-power current source LED controller.
Claims (3)
1. A high-power LED current controller based on constant voltage source control is characterized in that a DC/DC conversion circuit and an LED current adjusting circuit are arranged, and the LED current adjusting circuit comprises an LED lamp string and a high-power adjustable resistor; the DC/DC conversion circuit is internally provided with a DC/DC conversion chip, wherein a filter capacitor C4 is connected between a power input VIN and a reference ground, VIN is input to a pin 2 of the DC/DC conversion chip, a pin 3 of the DC/DC conversion chip is suspended, a filter capacitor C5 is connected between a pin 4 of the DC/DC conversion chip and the reference ground, one end of a capacitor C1 is connected with a pin 1 of the DC/DC conversion chip, the other end of the C1 is connected with a pin 8, and the pin 8 of the DC/DC conversion chip is connected with a power diode D1 and a power inductor L1; one end of the output of the power inductor is connected with a filter capacitor C2, the output of the filter capacitor C2 is VOUT voltage, a network formed by connecting a pin 6 of a DC/DC conversion chip in series with a capacitor C3 and a resistor R1 is connected with a network of a capacitor C6, an LED lamp string is connected with the output voltage of VOUT, and the LED lamp string is connected to a power resistor R2.
2. The constant voltage control-based high-power LED current controller according to claim 1, wherein the pin 5 of the DC/DC conversion chip is a reference voltage source and is a stable voltage, i.e. a stable voltage is present on the power resistor R2.
3. The high-power LED current controller based on constant-voltage source control as claimed in claim 1, wherein the DC/DC conversion circuit includes a DC-DC main chip and peripheral discrete components, the output of the DC/DC conversion circuit sets a constant voltage, the current flows into the power resistor through the LED string and then flows back to the reference ground, due to the constant voltage on the power resistor, which can be obtained by ohm's law, the current flowing through the power resistor is inversely proportional to the resistance of the power resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220422619.1U CN217037512U (en) | 2022-03-01 | 2022-03-01 | High-power LED current controller based on constant voltage source control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220422619.1U CN217037512U (en) | 2022-03-01 | 2022-03-01 | High-power LED current controller based on constant voltage source control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217037512U true CN217037512U (en) | 2022-07-22 |
Family
ID=82451817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220422619.1U Active CN217037512U (en) | 2022-03-01 | 2022-03-01 | High-power LED current controller based on constant voltage source control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217037512U (en) |
-
2022
- 2022-03-01 CN CN202220422619.1U patent/CN217037512U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102917499B (en) | DC (Direct Current)/DC-based LED (Light Emitting Diode) driving controller for lighting | |
| CN201063902Y (en) | LED driving power supply | |
| CN102105007B (en) | LED constant-current driver with boosting function | |
| CN101636021A (en) | LED constant current driving circuit | |
| CN102143629B (en) | high-voltage monolithic integrated circuit (XL5002) for driving LED (light-emitting diode) lamp | |
| CN2862144Y (en) | Constant-current source apparatus | |
| CN201093232Y (en) | LED electric lamp circuit | |
| CN202268152U (en) | Backlight constant-current and constant-voltage driving circuit for display screen | |
| CN203814023U (en) | PAM2842-based dimmable LED driver | |
| CN207010543U (en) | A kind of low harmony wave is gradually bright to fade off LED dimming drivers | |
| CN217037512U (en) | High-power LED current controller based on constant voltage source control | |
| CN201639821U (en) | Dimming control circuit of LED lamp | |
| CN204119071U (en) | A kind of simple and easy LED constant current source of energy Antisurge current | |
| CN202931614U (en) | LED driving controller used for illumination based on DC/DC | |
| CN201134955Y (en) | LED luminous light driving controller with high stability | |
| CN202679243U (en) | BJT type self-excited Buck converter with small main switch tube driving loss | |
| CN102045911A (en) | Light source regulation circuit for alternating current light-emitting diode | |
| CN205232515U (en) | Light -emitting diode (LED) driving circuit | |
| CN101262722B (en) | LED lighting device | |
| CN102932998B (en) | Power converter | |
| CN204761769U (en) | LED control circuit | |
| CN201234371Y (en) | Improved LED driving circuit | |
| CN202587483U (en) | High-efficiency LED drive circuit | |
| CN213368189U (en) | Constant voltage and constant current power supply circuit for LED lamp | |
| CN201515520U (en) | PWM chip LED constant current circuit with protection and power factor compensation functions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |