CN212463589U - LED drive circuit and LED lamp - Google Patents
LED drive circuit and LED lamp Download PDFInfo
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- CN212463589U CN212463589U CN202021524435.3U CN202021524435U CN212463589U CN 212463589 U CN212463589 U CN 212463589U CN 202021524435 U CN202021524435 U CN 202021524435U CN 212463589 U CN212463589 U CN 212463589U
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Abstract
The utility model relates to a LED drive circuit, belonging to the illumination field, comprising a rectifier module, an active power factor correction and constant voltage module and a linear constant current module; the rectification module rectifies an electric signal output by the power supply into a direct current signal; the active power factor correction and constant voltage module is connected between the rectification module and the linear constant current module, and is used for improving the power factor of the received direct current signal and outputting a constant voltage; the linear constant current module comprises a constant current control chip, a current limiting resistor is connected to an output current value setting port of the constant current control chip, one end of the current limiting resistor, which is opposite to the constant current control chip, is grounded, and a PWM dimming and color mixing port or a dimming and color mixing circuit is arranged on the constant current control chip. The utility model discloses the effect of the unsteady problem of power that linear constant current power supply appears when the commercial power floats has been solved. An LED lamp belongs to the field of illumination.
Description
Technical Field
The utility model belongs to the technical field of the technique of electric lighting and specifically relates to a LED drive circuit and LED lamps and lanterns are related to.
Background
The LED (light emitting diode) is used as a novel light source, has the characteristics of energy conservation, environmental protection and high efficiency, is mature in technology and is applied to various fields. LEDs are widely used as illumination light sources, and various LED driving circuits have been developed.
Existing circuit existence patterns applied to this field can be roughly classified into 3 types. The power supply is an isolated constant current power supply, a non-isolated constant current power supply and a linear constant current power supply. The isolated constant-current power supply has the characteristics of low efficiency and high cost. The non-isolated constant current power supply has high efficiency, the upper limit of load voltage generally cannot exceed about 180V, and the same relative cost of larger power is high. Although the linear constant-current power supply has relative advantages in cost, the floating of the power of the whole lamp is obvious when the commercial power floats.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, one of the purposes of the utility model is to provide a LED drive circuit who has solved the inconsistent problem of power that linear constant current power supply appears when the commercial power floats.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
an LED drive circuit comprises a rectifying module, an active power factor correction and constant voltage module and a linear constant current module;
the rectification module rectifies an electric signal output by the power supply into a direct current signal;
the active power factor correction and constant voltage module is connected between the rectification module and the linear constant current module, and is used for improving the power factor of the received direct current signal and outputting a constant voltage;
the linear constant current module comprises a constant current control chip, a current limiting resistor is connected to an output current value setting port of the constant current control chip, one end of the current limiting resistor, which is opposite to the constant current control chip, is grounded, and a PWM dimming and color mixing port or a dimming and color mixing circuit is arranged on the constant current control chip.
By adopting the technical scheme, when the current input into the constant current control chip is increased, the current-limiting resistance detection current is changed along with the change of the current, so that the internal resistance of the constant current control chip is increased (or reduced) to ensure that the current input into the constant current control chip at the input end is kept relatively constant, meanwhile, the constant voltage is input through the active power factor correction and constant voltage module, the combined linear constant current power supply is not influenced by the floating of the mains supply voltage any more to greatly increase or decrease the power of the whole lamp, the output power of 90-265VAC can be constant in principle, the problem that the power of the linear constant current power supply is not constant when the mains supply floats is solved, meanwhile, the cost is low, the power factor is.
The present invention may be further configured in a preferred embodiment as: the active power factor correction and constant voltage module comprises a boost PFC active power factor correction control chip.
The present invention may be further configured in a preferred embodiment as: the boost PFC active power factor correction control chip is KP1511 XSP.
By adopting the technical scheme, the KP1511X is a highly integrated boost PFC power switch, and the chip adopts a quasi-resonance working mode and an active power factor correction control technology, so that the requirements of high power factor, low harmonic distortion and high efficiency can be met.
The present invention may be further configured in a preferred embodiment as: the active power factor correction and constant voltage module comprises an active power factor correction and constant voltage unit comprising a boost PFC active power factor correction control chip, wherein the DRAIN end of the boost PFC active power factor correction control chip is connected with one end of a third inductor and the anode of a fifth diode, one end of the third inductor, which faces away from the fifth diode, is connected with a second capacitor, and one end of the second capacitor, which faces away from the third inductor, is grounded.
The present invention may be further configured in a preferred embodiment as: the end of the boost PFC active power factor correction control chip COMP is sequentially connected with a third capacitor and a first resistor, one end of the first resistor, which is back to the third capacitor, is grounded, and a fourth capacitor is connected in parallel with the third capacitor and the first resistor;
the VDD end of the boost PFC active power factor correction control chip is sequentially connected with a fifth capacitor and the ground;
the CS end of the boost PFC active power factor correction control chip is sequentially connected with a second resistor and the ground;
the GND end of the boost PFC active power factor correction control chip is directly grounded;
the FB end of the boost PFC active power factor correction control chip is connected with a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series, the FB end of the boost PFC active power factor correction control chip is connected between the third resistor and the fourth resistor, one end of the fourth resistor, back to the third resistor, is grounded, and one end of the third resistor, back to the fourth resistor, is connected with a cathode of a fifth diode.
The present invention may be further configured in a preferred embodiment as: and an EMC circuit is arranged at the front end of the rectifying module.
By adopting the technical scheme, internal and external interference is eliminated.
The present invention may be further configured in a preferred embodiment as: the constant current control chip is SM2082 EAS.
By adopting the technical scheme, the SM2082EAS is a single-channel LED linear constant current control chip, the chip uses the constant current setting and control technology of the chip, the output current is set by an external Rext resistor, the maximum current can reach 40mA, the output current does not change along with the voltage of an OUT port of the chip, and the constant current control chip has better constant current performance. The system has simple structure, few peripheral elements and low scheme cost. The chip has an over-temperature regulation function, when the temperature of the chip reaches an over-temperature regulation point, the output current is gradually reduced, the function of protecting the IC is achieved, and the application reliability is improved.
The present invention may be further configured in a preferred embodiment as: the rectifying module and the active power factor correction and constant voltage module are provided with an EMC circuit.
The present invention may be further configured in a preferred embodiment as: the EMC circuit comprises two groups of common mode inductors, and a first capacitor is connected between the two groups of common mode inductors.
The above utility model discloses an above-mentioned utility model purpose secondly can realize through following technical scheme:
an LED lamp is characterized by comprising the LED driving circuit.
The part can be written in the case of multiple owners, and in the case of single owner, the writing is not needed.
To sum up, the utility model discloses a following at least one useful technological effect:
1. the combined linear constant-current power supply is not influenced by the floating of the mains supply voltage any more, so that the power of the whole lamp is greatly increased and reduced, and the output power of 90-265VAC can be constant in principle;
2. the high power factor and the low harmonic content can reduce the neutral current pressure to the commercial power grid, thereby achieving the functions of environmental protection and consumption reduction;
3. the front-end EMC circuit is simpler;
4. the output direct current has low ripple content and no stroboflash;
5. the cost is low, the national CCC requirement is easily met, and technical force is contributed to the resource-saving society;
6. the number of the components is small, and the volume is small, so that the output voltage is high, and the loaded power is high.
Drawings
FIG. 1 is a schematic diagram of an LED driver circuit according to one embodiment.
The attached drawings are as follows: 1. an EMC circuit; 2. a rectification module; 3. an active power factor correction and constant voltage module; 4. and the linear constant current module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, for the utility model discloses a LED driving circuit, including EMC circuit 1, rectifier module 2, active power factor correction and constant voltage module 3 and linear constant current module 4.
The EMC circuit eliminates internal and external interference, and the rectifier module 2 rectifies an electric signal output by a power supply into a direct-current signal; the active power factor correction and constant voltage module 3 is connected between the rectifier module 2 and the linear constant current module 4, and is used for improving the power factor of the received direct current signal and outputting a constant voltage; the linear constant current module 4 includes a constant current control chip, a current limiting resistor R5 is connected to an output current value setting port of the constant current control chip, one end of the current limiting resistor R5, which is opposite to the constant current control chip U2, is grounded, a PWM dimming and color mixing port is disposed on the constant current control chip U2, or one or more sections of dimming and color mixing circuits may be connected to the constant current control chip U2, in this embodiment, the PWM dimming and color mixing port is preferably disposed on the constant current control chip.
The constant current control chip U2 is SM2082EAS, SM2082EAS is a single-channel or multichannel LED linear constant current control chip, the output current is set by the freewheel resistor R5, the basic principle is that when the current of the input OUT is increased (or decreased), the detection current of the freewheel resistor R5 is changed, so that the internal resistance of the U2 is increased (or decreased) to ensure that the current of the input OUT is kept relatively constant.
The EMC circuit 1 includes two sets of common mode inductances L1, L2, and a first capacitance C1 is connected between the two sets of common mode inductances L1, L2. The EMC circuit 1 may be replaced with an anti-surge circuit, and the EMC circuit 1 may be provided in the rectifier module 2 and the active power factor correction and constant voltage module 3.
In addition, in order to ensure the safety of the resistor, a fuse FU and a piezoresistor RV can be arranged at the port of the commercial power entering the driving circuit.
The active PFC and constant voltage module 3 comprises a boost PFC active PFC control chip U1, wherein the boost PFC active PFC control chip U1 is KP1511 XSP. KP1511XSP is a boost PFC active power factor correction control chip, and outputs constant voltage (can realize constant output DC voltage when commercial power is 90-265V).
The active power factor correction and constant voltage module 3 includes an active power factor correction and constant voltage unit including a boost PFC active power factor correction control chip U1, a DRAIN end of the boost PFC active power factor correction control chip U1 is connected to one end of a third inductor L3 and an anode of a fifth diode D5, one end of the third inductor L3, which faces away from the fifth diode D5, is connected to a second capacitor C2, and one end of the second capacitor C2, which faces away from the third inductor L3, is grounded.
A COMP end of the boost PFC active power factor correction control chip U1 is sequentially connected with a third capacitor L3 and a first resistor R1, one end of the first resistor R1, back to the third capacitor C3, is grounded, and a fourth capacitor C4 is connected in parallel with the third capacitor C3 and the first resistor R1; the VDD end of the boost PFC active power factor correction control chip U1 is sequentially connected with a fifth capacitor C5 and the ground; the CS end of the boost PFC active power factor correction control chip U1 is sequentially connected with a second resistor R2 and the ground; the GND end of the boost PFC active power factor correction control chip U1 is directly grounded; the FB end of the boost PFC active power factor correction control chip U1 is connected to a third resistor R3 and a fourth resistor R4, the third resistor R3 is connected in series with the fourth resistor R4, the FB end of the boost PFC active power factor correction control chip U1 is connected between the third resistor R3 and the fourth resistor R4, one end of the fourth resistor R4, which faces away from the third resistor R3, is grounded, and one end of the third resistor R3, which faces away from the fourth resistor R4, is connected to the cathode of a fifth diode D5.
The implementation principle of the embodiment is as follows: when the current input into the constant current control chip U2 is increased, the current limiting resistor R5 detects that the current changes along with the current, so that the internal resistance of the constant current control chip U2 is increased (or reduced) to ensure that the current input into the input end constant current control chip U2 is kept relatively constant, meanwhile, constant voltage is input through the active power factor correction and constant voltage module 3d, the combined linear constant current power supply is not influenced by the floating of the mains supply voltage any more to greatly increase and decrease the power of the whole lamp, the 90-265VAC output power can be constant in principle, the problem that the power of the linear constant current power supply is not constant when the mains supply floats is solved, and meanwhile, the cost is low, the power factor is high, and the ripple content.
An LED lamp comprises the LED drive circuit.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (10)
1. An LED drive circuit, characterized by: the power factor correction circuit comprises a rectification module (2), an active power factor correction and constant voltage module (3) and a linear constant current module (4);
the rectification module (2) rectifies the electric signal output by the power supply into a direct current signal;
the active power factor correction and constant voltage module (3) is connected between the rectifier module (2) and the linear constant current module (4), and is used for improving the power factor of the received direct current signal and outputting a constant voltage;
the linear constant current module (4) comprises a constant current control chip, a current limiting resistor is connected to an output current value setting port of the constant current control chip, one end of the current limiting resistor, which is opposite to the constant current control chip, is grounded, and a PWM dimming and color mixing port or a dimming and color mixing circuit is arranged on the constant current control chip.
2. The LED driving circuit according to claim 1, wherein: the active power factor correction and constant voltage module (3) comprises a boost PFC active power factor correction control chip.
3. The LED driving circuit according to claim 2, wherein: the boost PFC active power factor correction control chip is KP1511 XSP.
4. The LED driving circuit according to claim 3, wherein: the active power factor correction and constant voltage module (3) comprises an active power factor correction and constant voltage unit comprising a boost PFC active power factor correction control chip, wherein the DRAIN end of the boost PFC active power factor correction control chip is connected with one end of a third inductor and the positive electrode of a fifth diode, one end of the third inductor, which faces away from the fifth diode, is connected with a second capacitor, and one end of the second capacitor, which faces away from the third inductor, is grounded.
5. The LED driving circuit according to claim 4, wherein: the end of the boost PFC active power factor correction control chip COMP is sequentially connected with a third capacitor and a first resistor, one end of the first resistor, which is back to the third capacitor, is grounded, and a fourth capacitor is connected in parallel with the third capacitor and the first resistor;
the VDD end of the boost PFC active power factor correction control chip is sequentially connected with a fifth capacitor and the ground;
the CS end of the boost PFC active power factor correction control chip is sequentially connected with a second resistor and the ground;
the GND end of the boost PFC active power factor correction control chip is directly grounded;
the FB end of the boost PFC active power factor correction control chip is connected with a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series, the FB end of the boost PFC active power factor correction control chip is connected between the third resistor and the fourth resistor, one end of the fourth resistor, back to the third resistor, is grounded, and one end of the third resistor, back to the fourth resistor, is connected with a cathode of a fifth diode.
6. The LED driving circuit according to claim 1, wherein: the front end of the rectifier module (2) is provided with an EMC circuit (1).
7. The LED driving circuit according to claim 1, wherein: the constant current control chip is SM2082 EAS.
8. The LED driving circuit according to claim 1, wherein: the rectifying module (2) and the active power factor correction and constant voltage module (3) are provided with an EMC circuit (1).
9. The LED driving circuit according to claim 6 or 8, wherein: the EMC circuit (1) comprises two groups of common mode inductors, and a first capacitor is connected between the two groups of common mode inductors.
10. An LED lamp comprising the LED driving circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021524435.3U CN212463589U (en) | 2020-07-28 | 2020-07-28 | LED drive circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021524435.3U CN212463589U (en) | 2020-07-28 | 2020-07-28 | LED drive circuit and LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212463589U true CN212463589U (en) | 2021-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021524435.3U Active CN212463589U (en) | 2020-07-28 | 2020-07-28 | LED drive circuit and LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212463589U (en) |
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2020
- 2020-07-28 CN CN202021524435.3U patent/CN212463589U/en active Active
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