CN113301688A - Constant-current LED power supply circuit capable of limiting power supply output power and no-load voltage - Google Patents
Constant-current LED power supply circuit capable of limiting power supply output power and no-load voltage Download PDFInfo
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- CN113301688A CN113301688A CN202110503065.8A CN202110503065A CN113301688A CN 113301688 A CN113301688 A CN 113301688A CN 202110503065 A CN202110503065 A CN 202110503065A CN 113301688 A CN113301688 A CN 113301688A
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- 238000009966 trimming Methods 0.000 claims description 3
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention relates to a constant-current LED power supply circuit capable of limiting power supply output power and no-load voltage, which comprises a constant-voltage power supply module (1), a DC-DC voltage reduction module (2) arranged at the rear end of the constant-voltage power supply module (1), and an adjusting module (3) which is respectively connected with a constant-current output end of the circuit and the DC-DC voltage reduction module (2), dynamically adjusts output current by controlling the DC-DC voltage reduction module (2) when the circuit is in no-load, and limits the power supply output power and the no-load voltage by shunting to maintain the output current to a set value. The application is stable and reliable, and the product performance is improved.
Description
Technical Field
The invention relates to the technical field of lamp production, in particular to a constant-current LED power supply circuit capable of limiting power output power and no-load voltage.
Background
The constant-current LED power supply circuit based on the characteristics of simple structure, high cost performance, high efficiency and the like of the constant-current LED power supply circuit composed of the single-stage constant-voltage circuit at the front stage and the DC-DC voltage reduction circuit at the rear stage is widely applied to the market. However, the direct current output ripple of the single-stage constant voltage circuit is relatively large, which affects the stability of the circuit, and in order to reduce the current ripple output by the LED power supply, the output voltage of the front-stage power supply is usually increased, and because the input and output of the DC-DC circuit have a relatively large voltage difference (the voltage difference is generally above 5V), the input and output voltage difference of the DC-DC circuit can reach about 8V while the output voltage of the front-stage power supply is increased.
However, the increase of the differential input/output voltage of the DC-DC line causes many problems. Firstly, the LED power supply requires that the load power is increased to the maximum when abnormal testing is carried out, namely, overload testing is carried out, under the condition, the output power of the LED power supply can greatly exceed the rated power, the temperature rise of components of the LED power supply can rise greatly and exceed the maximum temperature value required by the standard, and the overload testing of the LED power supply cannot pass.
Secondly, the output voltage of the front-stage power supply is increased, which causes the output voltage of the circuit to increase, and if the rated output voltage of the circuit is greater than 35V, the no-load output voltage is greater than 42.5V due to the increase of the input-output voltage difference of the DC-DC line, which does not meet the SELV standard.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a constant current LED power supply circuit with small dc output ripple, stable and reliable circuit, and simple structure, which can limit the output power and the no-load voltage of the power supply.
In order to achieve the purpose, the technical scheme of the invention is as follows: a constant current LED power supply circuit capable of limiting power supply output power and no-load voltage comprises a constant voltage power supply module and a DC-DC voltage reduction module arranged at the rear end of the constant voltage power supply module, and is characterized in that:
the circuit also comprises an adjusting module which is respectively connected with the constant current output end of the circuit and the DC-DC voltage reduction module, dynamically adjusts output current by controlling the DC-DC voltage reduction module when the circuit is in no-load, and maintains the output current to a set value by shunting so as to limit the output power and no-load voltage of the power supply.
Further, the regulating module comprises a switch module which is arranged between the constant current output end and the DC-DC voltage reduction module, is switched on when the circuit is in no-load state so as to enable the DC-DC voltage reduction module to be switched off, and is switched off after the DC-DC voltage reduction module is switched off so as to enable the DC-DC voltage reduction module to be switched on to dynamically regulate the output current to a set value.
Furthermore, the adjusting module further comprises a shunt module which is connected in parallel at two ends of the switch module and can shunt the air-load current to maintain the output current at a set value.
Furthermore, the regulating module further comprises a voltage stabilizing module arranged between the switch module and the constant current output end to maintain the no-load voltage within a set range.
Furthermore, the adjusting module further comprises a fine adjusting module arranged between the switch module and the constant current output end for fine adjusting the no-load voltage and maintaining the no-load voltage within a set range.
Further, the switch module is an optical coupler isolator with a light emitting part connected with the constant current output end and a phototriode part connected with the enabling control end of the DC-DC voltage reduction module.
Further, the shunt module is a shunt resistor.
Further, the voltage stabilizing module is a voltage stabilizing diode.
Further, the trimming module is a resistor.
Compared with the prior art, the invention has the advantages that: the output current under the no-load mode is reduced through the switch module which is provided with the working state of the controllable DC-DC voltage reduction module, the output current is maintained at a set value in a shunting mode, and the circuit ripple is well reduced and the DC-DC input-output voltage difference is improved under the action of the voltage stabilizing module and the fine adjustment module, so that the overload capacity and the no-load voltage of the circuit are in a set range, the product performance is improved, and meanwhile, the circuit is simple in design structure, stable and reliable in circuit and strong in applicability.
Drawings
Fig. 1 is a circuit schematic diagram of a preferred embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1, a schematic circuit diagram of a preferred embodiment of the present invention is shown, in which the constant current LED power supply circuit capable of limiting the output power and the no-load voltage of the power supply includes a constant voltage power supply module 1 and a DC-DC voltage dropping module 2 disposed at the rear end of the constant voltage power supply module 1. The constant voltage power supply module 1 is preferably a single-stage constant voltage circuit in this embodiment, but it is needless to say that a multi-stage constant voltage circuit may be adopted, and only at this time, the multi-stage constant voltage circuit and the DC-DC voltage reduction module at the rear end cannot share a switching tube, and each of the multi-stage constant voltage circuit and the DC-DC voltage reduction module needs an independent switching tube for control.
As described in the background art, in order to reduce the current ripple by increasing the output voltage of the preceding stage power supply, and to ensure that the circuit meets the requirement of the overload test, and to improve the performance of the product, the circuit of the present application further includes an adjusting module 3, which is respectively connected to the constant current output terminal of the circuit and the DC-DC voltage-reducing module 2, and dynamically adjusts the output current by controlling the DC-DC voltage-reducing module 2 when the circuit is in no-load, and limits the output power and the no-load voltage of the power supply by shunting to maintain the output current to a set value.
Obviously, as is well known to those skilled in the art, the set value is the constant current outputted by the constant current power supply circuit. For the existing constant current LED power supply circuit, the output current of the circuit is very large at the moment of no-load, the no-load voltage is also very large, even if the circuit is recovered to the constant current output after being stabilized, the output power caused at the moment of no-load can far exceed the rated power, so that the circuit is damaged, and the regulating module 3 can immediately and dynamically regulate the output current by controlling the working state of the DC-DC voltage reduction module under the condition, so that the problem is avoided.
Specifically, the regulating module includes a switch module 31 disposed between the constant current output terminal and the DC-DC voltage reducing module 2, and turned on when the circuit is idle to turn off the DC-DC voltage reducing module 2, and turned off after the DC-DC voltage reducing module 2 is turned off to turn on the DC-DC voltage reducing module 2 to dynamically adjust the output current to a set value.
In the present embodiment, the switch module 31 is an opto-isolator N3 in which the light emitting part is connected to the constant current output terminal and the photo-triode part is connected to the enable control terminal EN of the DC-DC buck module 2. Of course, the switch module 31 may also be other devices, such as a transistor, a MOS transistor, etc.
When the circuit is in no-load, the voltage of the output end is increased, the input end of the optical coupler is conducted, the output end of the optical coupler is also conducted, according to the structure shown in fig. 1, the optical coupler is conducted, so that the enable control end EN of the DC-DC voltage reduction module 2 is pulled to a low level, the DC-DC voltage is turned off, the output current immediately drops to be below the current value required when the optical coupler is conducted, the optical coupler is turned off, the EN is restored to a high level, the DC-DC voltage reduction module 2 is turned on again, current output exists at the moment, when the output current is larger than no-load consumption current, the circuit is always turned off when the optical coupler is conducted, the phenomenon that the optical coupler is conducted when the DC-DC voltage is turned off is caused, when the output current drops to the no-load consumption current, the voltage of the EN end is stable, at the moment, the output voltage and the output current are stabilized at a set value, and the no-load voltage is also stabilized at the set value.
It should be noted that, after the circuit is stabilized, the optical coupler and the DC-DC are both in a conducting state, and the optical coupler itself has a forward voltage drop (generally 1V) and a conducting current, so that the no-load current consumption is greater than the output current, and in order to maintain the circuit stability and ensure that the output voltage is maintained at the set value, the adjusting module 3 of the present application further includes a shunt module 32 connected in parallel to both ends of the switch module 31 and capable of shunting the no-load current to maintain the output current at the set value, that is, as shown in fig. 1, a resistor R12 connected in parallel to both ends of the optical coupler N3.
Meanwhile, it should be noted that the DC-DC shutdown will cause the circuit voltage to drop sharply, which results in a low no-load voltage drop, and thus affects the overload test, and in order to ensure the normal operation of the circuit, the regulating module 3 further includes a voltage stabilizing module 33 disposed between the switching module 31 and the constant current output terminal to maintain the no-load voltage within a set range. As shown, the voltage regulation module 33 is a voltage regulation diode D5, and the voltage regulation value of the voltage regulation diode D5 is calculated according to the actual circuit. Furthermore, the adjusting module 3 further includes a trimming module 34, i.e. a resistor R11 shown in fig. 1, disposed between the switching module 31 and the constant current output terminal to trim the idle voltage and maintain the idle voltage within a set range.
The aforementioned setting range is determined according to the rated power, that is, the voltage value corresponding to a value not exceeding 10% or less of the rated power is the no-load voltage value here. By adopting the circuit design of the application, the no-load power exceeds the rated power by about 8 percent and meets the related labeling requirements.
The following is to take the DC-DC constant current output of 36V1A as an example, and compare the practical effect of the circuit of the present application with the existing circuit to verify the beneficial effect of the circuit.
As mentioned in the background art, when the output voltage of the front stage power supply is increased and the DC-DC input/output voltage difference reaches 8V, the output voltage of the single-stage constant voltage power supply is about 44V, and the rated DC-DC output power is 36V × 1A — 36W.
Without the circuit of the present invention, when the load is overloaded to the maximum, the output power is about 44V × 1A — 44W, and the output power exceeds the rated power by 8W, i.e., about 1.22 times the rated power. Under overload conditions, the temperature rise of components in the LED power supply is quite high, and many components exceed the maximum temperature value required by the standard. And under the condition of no load output, the output voltage of the power supply is 44V, and the output voltage cannot exceed 42.5V required by the SELV standard, obviously, the existing circuit does not meet the standard requirement.
After the circuit design of the application is adopted, when the output end is in no-load, the voltage of the output end is increased, the input end of the optical coupler is conducted, the output end of the optical coupler is also conducted, the EN end of the DC-DC is pulled down (a pull-up resistor is arranged inside the EN of the DC-DC), the output current is immediately reduced, and when the current is reduced to the no-load consumption current set by the circuit, the voltage of the EN end is stabilized. The output voltage and the output current at this time are stabilized at set values, and the no-load voltage is also stabilized at the set values. When the load voltage is smaller than the set value, the EN end of the DC-DC is not pulled down by the optical coupler, and the output current is determined by R16 of the DC-DC.
The forward voltage drop of the input end of the general optical coupler is about 1V, the voltage of a D5 voltage stabilizing diode is selected to be 36V according to the design, the R12 resistor divides the no-load consumption current, if the resistance value is 360 ohm (the specific selection of the resistance value is actually determined according to the specific situation), the consumption current of the general optical coupler can be calculated to be multiple points of 2mA at 1V/360 because the general optical coupler is connected in parallel at the two ends of the optical coupler.
Simultaneously, R11 fine tunes the airborne voltage. According to the actual situation, it is assumed that 3mA is consumed by the branch where R11 is located when no load occurs, and the resistance of R11 is 680 ohms, so that the output voltage is about R11 × 3mA + D5(36V) + the input forward voltage drop of the optical coupler (1V) ═ 39V.
So, the fine realization of this application is through improving preceding stage power supply output voltage to when reducing the electric current ripple, guaranteed that circuit no-load voltage and no-load power are all in setting for the within range, make the circuit reliable and stable, improved product property ability, this circuit design simple structure simultaneously, the suitability is strong.
While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A constant current LED power supply circuit capable of limiting power supply output power and no-load voltage comprises a constant voltage power supply module (1) and a DC-DC voltage reduction module (2) arranged at the rear end of the constant voltage power supply module (1), and is characterized in that:
the circuit also comprises an adjusting module (3) which is respectively connected with the constant current output end of the circuit and the DC-DC voltage reduction module (2) and dynamically adjusts the output current by controlling the DC-DC voltage reduction module (2) when the circuit is in no-load and maintains the output current to a set value by shunting so as to limit the output power and no-load voltage of the power supply.
2. The constant current LED power supply circuit of claim 1, wherein the power supply output power and the no-load voltage are limited by:
the adjusting module (3) comprises a switch module (31) which is arranged between the constant current output end and the DC-DC voltage reduction module (2), is switched on when the circuit is in no-load state so as to enable the DC-DC voltage reduction module (2) to be switched off, and is switched off after the DC-DC voltage reduction module (2) is switched off so as to enable the DC-DC voltage reduction module (2) to be switched on to dynamically adjust the output current to a set value.
3. The constant current LED power supply circuit of claim 2, wherein the power supply output power and the no-load voltage are limited by:
the adjusting module (3) further comprises a shunt module (32) which is connected in parallel at two ends of the switch module (31) and can shunt the air-load current to maintain the output current at a set value.
4. A constant current LED power supply circuit capable of limiting power supply output power and no-load voltage according to claim 3, wherein:
the regulating module (3) further comprises a voltage stabilizing module (33) which is arranged between the switch module (31) and the constant current output end to maintain the no-load voltage within a set range.
5. The constant current LED power supply circuit of claim 4, wherein the power supply output power and the no-load voltage are limited by:
the adjusting module (3) further comprises a fine adjusting module (34) which is arranged between the switch module (31) and the constant current output end and used for fine adjusting the no-load voltage and maintaining the no-load voltage within a set range.
6. The constant current LED power supply circuit of claim 2, wherein the power supply output power and the no-load voltage are limited by:
the switch module (31) is an optical coupler isolator (N3) with a luminous component connected with a constant current output end and a phototriode component connected with an enabling control end of the DC-DC voltage reduction module (2).
7. A constant current LED power supply circuit capable of limiting power supply output power and no-load voltage according to claim 3, wherein:
the shunt module (32) is a shunt resistor (R12).
8. The constant current LED power supply circuit of claim 4, wherein the power supply output power and the no-load voltage are limited by:
the voltage stabilizing module (33) is a voltage stabilizing diode (D5).
9. The constant current LED power supply circuit of claim 5, wherein the power supply output power and the no-load voltage are limited by:
the trimming module (34) is a resistor (R11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110503065.8A CN113301688B (en) | 2021-05-10 | 2021-05-10 | Constant-current LED power supply circuit capable of limiting power supply output power and no-load voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110503065.8A CN113301688B (en) | 2021-05-10 | 2021-05-10 | Constant-current LED power supply circuit capable of limiting power supply output power and no-load voltage |
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| CN113301688A true CN113301688A (en) | 2021-08-24 |
| CN113301688B CN113301688B (en) | 2024-04-12 |
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2021
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| CN201001227Y (en) * | 2007-02-02 | 2008-01-02 | 匡小红 | High power LED constant-current driving power source |
| CN202218460U (en) * | 2011-08-25 | 2012-05-09 | 深圳茂硕电源科技股份有限公司 | DC coupled buck-boost solar LED power source |
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