CN214205909U - CDR current-limiting constant current LED drive circuit - Google Patents
CDR current-limiting constant current LED drive circuit Download PDFInfo
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- CN214205909U CN214205909U CN202120009328.5U CN202120009328U CN214205909U CN 214205909 U CN214205909 U CN 214205909U CN 202120009328 U CN202120009328 U CN 202120009328U CN 214205909 U CN214205909 U CN 214205909U
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Abstract
The utility model discloses a CDR current-limiting constant current LED drive circuit, including LED lamp module piece, first branch road and second branch road, be provided with electrolytic capacitor, first diode and the first resistance of establishing ties on the first branch road, be provided with linear driver chip on the second branch road, the first end of first branch road and the first end of second branch road all are connected with the power negative pole, and the second end of first branch road and the second end of second branch road all are connected with the power negative pole, LED drive circuit still includes the second diode, the negative pole of second diode with electrolytic capacitor's negative pole is connected, and the positive pole and the power negative pole of second diode are connected. The utility model discloses a CDR current-limiting constant current LED drive circuit is simple and easy, with low costs, can realize the constant current drive setting of LED lamp.
Description
Technical Field
The utility model relates to a LED lighting technology field especially relates to a CDR current-limiting constant current LED drive circuit.
Background
As a low-carbon, green, and pollution-free light source, LEDs have become an indispensable part of people's lives. In the field of LED general lighting, a chip dedicated to an LED driving circuit is generally used to drive an LED light source, and different circuit topologies and architectures are used to implement constant current setting of the LED circuit. However, the peripheral circuit of this scheme is complicated and costly, and sometimes risks that the IC chip is out of stock and cannot be put into production normally.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a CDR current-limiting constant current LED drive circuit not only realizes the constant current setting of LED circuit, still simple reliable, with low costs, easily realizes the volume production. The technical scheme is as follows:
the utility model provides a CDR current-limiting constant current LED drive circuit, LED drive circuit includes
The LED lamp module is provided with an anode and a cathode, and the cathode of the LED lamp module is connected with the negative electrode of the power supply;
the LED lamp comprises a first branch circuit, wherein an electrolytic capacitor, a first diode and a first resistor are arranged on the first branch circuit in series connection, the anode of the first diode is connected with the cathode of the electrolytic capacitor, the first resistor is connected with the cathode of the electrolytic capacitor, one end of the first branch circuit, which is close to the electrolytic capacitor, is a first end of the first branch circuit, one end of the first branch circuit, which is close to the first diode, is a second end of the first branch circuit, the first end of the first branch circuit is connected with the positive electrode of a power supply, and the second end of the first branch circuit is connected with the anode of the LED lamp module;
the LED lamp comprises a first branch circuit, a second branch circuit and a power supply, wherein a linear driving chip is arranged on the first branch circuit, the linear driving chip is provided with a CS pin, a Drain pin and a GND pin, the CS pin is connected with the GND pin through a current detection resistor, one end of the second branch circuit, close to the Drain pin, is a first end of the second branch circuit, one end of the second branch circuit, close to the CS pin, is a second end of the second branch circuit, the first end of the second branch circuit is connected with a positive electrode of the power supply, a second end of the second branch circuit is connected with an anode of the LED lamp module, and the second end of the second branch circuit is positioned between the current detection resistor and the GND pin;
and the anode of the second diode is connected with the negative electrode of a power supply, and the cathode of the second diode is connected with the cathode of the electrolytic capacitor.
Optionally, in the first branch, the electrolytic capacitor, the first diode and the first resistor are connected in series in sequence, and the first resistor is connected to a cathode of the first diode.
Or, in the first branch, the electrolytic capacitor, the first resistor and the first diode are connected in series in sequence, and the first resistor is connected with the anode of the first diode.
Further, the LED driving circuit includes a third triode, an anode of the third triode is connected to a positive electrode of the power supply, and a cathode of the third triode is connected to the first end of the first branch.
Further, the LED lamp module comprises a plurality of LED lamps which are connected end to end in series.
Further, the first resistor is a chip resistor or a plug-in resistor.
Further, the first resistor is a purely resistive linear element.
Further, the linear driving chip is a low-voltage linear constant current chip.
When the instantaneous voltage of the input voltage is 1-2 times of the working voltage of the LED lamp module, the linear driving chip is in a conducting state, and the electrolytic capacitor is in a disconnecting state;
when the instantaneous voltage of the input voltage is greater than 2 times of the working voltage of the LED lamp module, the linear driving chip is in an off state, and the electrolytic capacitor is in an on state.
The utility model has the advantages of that:
a. the constant current setting of the LED circuit is realized, and the LED circuit is simple and reliable;
b. the cost is low, and mass production is easy to realize;
c. PCB space is saved.
Drawings
Fig. 1 is a circuit diagram of a CDR current-limiting constant-current LED driving circuit provided by an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further explained below with reference to the drawings and the specific embodiments of the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In an embodiment of the present invention, as shown in fig. 1, a CDR current-limiting constant-current LED driving circuit is provided, the LED driving circuit includes
The LED lamp module is provided with an anode and a cathode, and the cathode of the LED lamp module is connected with the negative electrode of the power supply;
the LED lamp comprises a first branch circuit, wherein an electrolytic capacitor C, a first diode D and a first resistor R which are connected in series are arranged on the first branch circuit, the anode of the first diode is connected with the cathode of the electrolytic capacitor, the first resistor is connected with the cathode of the electrolytic capacitor, one end of the first branch circuit, which is close to the electrolytic capacitor, is a first end of the first branch circuit, one end of the first branch circuit, which is close to the first diode, is a second end of the first branch circuit, the first end of the first branch circuit is connected with the positive electrode of a power supply, and the second end of the first branch circuit is connected with the anode of the LED lamp module;
the LED lamp comprises a first branch circuit, a second branch circuit and a power supply, wherein a linear driving chip IC is arranged on the first branch circuit, the linear driving chip is provided with a CS pin, a Drain pin and a GND pin, the CS pin is connected with the GND pin through a current detection resistor, one end of the second branch circuit, close to the Drain pin, is a first end of the second branch circuit, one end of the second branch circuit, close to the CS pin, is a second end of the second branch circuit, the first end of the second branch circuit is connected with a positive electrode of the power supply, and the second end of the second branch circuit is connected with an anode of the LED lamp module;
and a current detection resistor Rcs is arranged on the second branch, two ends of the current detection resistor Rcs are respectively connected with the CS pin and the GND pin, and a second end of the second branch is positioned between the current detection resistor and the GND pin. Rcs is a current sense resistor that controls the peak current through the LED during low voltage conduction.
And the anode of the second diode D2 is connected with the negative electrode of the power supply, and the cathode of the second diode is connected with the cathode of the electrolytic capacitor.
The electrolytic capacitor C is an energy storage element which can store charges and can flow current during charging and discharging when the power supply voltage is higher than twice of the LED load voltage; the function of the second diode D2 is to provide a path for discharging the electrolytic capacitor; the first diode D is used for rectifying and preventing the LED current from reversely flowing into the electrolytic capacitor, and the first resistor R is used for increasing loop impedance and playing a role in limiting current and constant current. The first end of the first branch circuit is connected with a Drain terminal Drain of the linear driving chip, and is used for discharging the electrolytic capacitor when the voltage of the electrolytic capacitor is lower than the LED load voltage, and the first end of the first branch circuit, the LED module and the freewheeling diode D2 form a discharging loop and supplement the current of the LED loop.
The first diode D and the second diode D2 may be ordinary rectifier diodes or semiconductor elements made of fast recovery or ultra-fast recovery silicon or silicon carbide semiconductor materials, and their specifications and types may be the same or different.
In an embodiment of the present invention, in the first branch, the electrolytic capacitor, the first diode and the first resistor are sequentially connected in series, and the first resistor is connected to a cathode of the first diode.
In another embodiment of the present invention, in the first branch, the electrolytic capacitor, the first resistor and the first diode are sequentially connected in series, and the first resistor is connected to an anode of the first diode.
The change of the connection order of first resistance and first diode is right the technical scheme of the utility model does not have the influence.
In an embodiment of the present invention, the LED driving circuit includes a third triode, an anode of the third triode is connected to a power source anode, and a cathode of the third triode is connected to the first end of the first branch for reducing conducted interference.
In an embodiment of the present invention, the LED lamp module includes one or more LED lamps connected end to end in series, as shown in fig. 1, the first LED lamp is LED1, and so on, the nth LED lamp is LEDn, and in these LED lamps, the anode of the ith lamp is connected to the cathode of the (i-1) th lamp (i is an integer greater than 1 and less than or equal to n), so as to form a lamp string. That is to say, the utility model discloses both can be used for the condition of single LED, for example desk lamp illumination, also can be used for the condition of many LEDs, for example hall illumination, can be used for many LED array display even.
In an embodiment of the present invention, the first resistor is a chip resistor or a plug-in resistor, and different resistance values can be selected, so as to adjust the magnitude of the current.
In a preferred embodiment of the present invention, the first resistor is a purely resistive linear element.
In an embodiment of the present invention, the linear driving chip is a low-voltage linear constant current chip, and is suitable for being applied to the control of the LED lamp.
The technical scheme of the utility model can match with the linear constant current circuit of simple single-ended LED of low pressure and use, can realize the LED constant current of full voltage section, greatly reduce the circuit cost.
In an embodiment of the present invention:
when the instantaneous voltage of the input voltage is 1-2 times of the working voltage of the LED lamp module, the linear driving chip is in a conducting state, the electrolytic capacitor is in a disconnecting state, namely the second branch is conducted, and the first branch is disconnected;
when the instantaneous voltage of the input voltage is greater than 2 times of the working voltage of the LED lamp module, the linear driving chip is in a disconnected state, the electrolytic capacitor is in a connected state, namely the first branch circuit is connected, and the second branch circuit is disconnected.
Because the first branch circuit and the second branch circuit have different regulation characteristics on voltage or current, the two branch circuits have different conduction conditions under different instantaneous voltages, and the whole circuit regulates the voltage in a proper regulation mode to finally obtain the voltage and the constant current suitable for the work of the LED lamp.
Specifically, the functions of the respective elements are as follows:
energy storage element electrolytic capacitor C: the element C will take on a part of the voltage above the LED load for protecting the LED and at the same time charge up the stored charge, and will also be used to freewheel the LED when the supply voltage is lower than the LED load voltage. And C, the current of the LED is continuously uninterrupted through regular charging and discharging.
First diode (isolation diode) D: and the anode of the element D is connected with the cathode of the element C, and the cathode of the element D is connected with the current-limiting constant-current resistor R. D is used to prevent the current of the LED string from flowing backwards to the cathode of C when the low voltage linear IC is operating.
First resistor (current-limiting constant-current resistor) R: the element R is a pure resistive element and is used for increasing the resistance of a series circuit of the CDR and changing the size of the element R to limit and keep the current constant.
The IC is characterized by a low-voltage single-section linear constant-current IC.
One end of the CDR constant current circuit is connected with the positive phase of the power module through the positive electrode of the C and is also connected with the Drain of the low-voltage single-section constant current IC, the other end of the CDR constant current circuit is connected with the positive phase of the LED string through the R and is also connected with the public reference point GND of the low-voltage single-section constant current IC, the current detection pin CS of the IC is also connected to the public reference point GND of the IC through the detection resistor, and the full-voltage-range constant current circuit formed by the CDR utility model and the low-voltage single-section constant current IC simultaneously comprises a freewheeling diode D2.
The cathode of the D2 is connected with the cathode of the electrolytic capacitor C and the anode of the first diode D, the anode of the second diode D2 is connected with the cathode of the power module and the cathode of the LED string, namely, the anode of the D2 and the cathode of the LED string are both connected with the cathode of the power module.
The sequence of D and R in the CDR constant current circuit can be interchanged in a series circuit, and the characteristic is as follows: the cathode of the electrolytic capacitor C is connected with one end of a first resistor R, the other end of the resistor R is connected with the anode of the first diode D, and the resistor R is also connected with the cathode of a freewheeling diode D2. And the cathode of the first diode D is connected with the anode of the LED string and is also connected with a common reference point GND of the low-voltage single-section constant current IC.
In an embodiment of the present invention, the power module (or external power supply), the one or more LEDs, and the CDR constant current and the low-voltage single-stage linear constant current IC constitute a full-voltage constant current circuit, also called CDR constant current circuit, or called CDR circuit.
In the embodiment, a plurality of LEDs are arranged in series and are respectively marked as LEDs 1-LEDn, after the LEDs are sequentially connected in series according to the sequence 1-n, the anode of the LED is connected with a first resistor R of a CDR constant current circuit and is also connected to a common end GND of a low-voltage single-section linear constant current IC, and the cathode of the LED string is connected to the cathode of a power supply module.
The CDR constant current circuit includes a circuit string composed of an electrolytic capacitor C, a first resistor R, and a first diode D, as shown in fig. 1, wherein the sequences of D and R can be interchanged, and have the same constant current function. The circuit string is connected to the anode of the power supply module or the power supply module through the anode of the C and is connected to a Drain pin of the low-voltage single-segment linear constant-current IC. The anode of a second diode (freewheeling diode) D2 is connected to the cathode of the LED string and the cathode of the power supply module.
A third diode D3 may be added between the anode of the electrolytic capacitor C and the power module to resolve conducted interference generated during the operation of the circuit.
The CS pin of the low-voltage single-segment linear constant-current IC is connected with a current detection resistor to the common end GND of the IC so as to control the peak current flowing through the LED during the low-voltage conduction period.
The power module is a direct current power supply with the instantaneous voltage value changing in real time, and can be obtained by rectifying alternating current commercial power through a rectifier bridge. A small-capacity CBB capacitor can be placed behind the rectifier bridge for filtering harmonic interference, or not, and is determined according to the anti-interference capability of the circuit. But cannot be used for large-capacity electrolysis to avoid flattening instantaneous voltage changes in real time to influence the circuit operation.
Now do simple introduction to this utility model's whole working process of circuit:
when the instantaneous voltage provided by the power supply module is smaller than the voltage of the LED load, the LED load is not conducted, no current flows through the LED, the electrolytic capacitor C cannot be charged and store energy due to the fact that no conducting loop exists, and the whole circuit does not work. With the increase of input instantaneous voltage, when the value of the input instantaneous voltage reaches an interval which is larger than LED load voltage and is smaller than 2 times of the LED load voltage, a Drain end of a low-voltage single-section linear constant current IC is conducted, current flows through an LED, the current flowing through the LED is increased with the increase of the instantaneous voltage, in order to avoid the overlarge current of the LED, a line compensation circuit inside the IC detects the input voltage in real time, the peak value of the LED is limited by reducing a reference value of a CS end, and constant current of multiple power frequency periods is achieved. When IC work, utility model circuit is by the inside MOSFET short circuit of I, and utility model circuit is out of work. Along with input voltage's further increase, when power supply's instantaneous voltage was greater than 2 times LED load voltage, the IC line complemented big enough, and the reference voltage of CS foot will be 0, and its inside MOSFET is turn-offed this moment, the utility model discloses the CDR circuit begins to work. At the moment, current flows through electrolysis, energy is stored for electrolytic charging, voltage except the voltage value of the LED load is shared, and the resistor R limits the current flowing through the LED. Different LED currents can be obtained by changing the R value of the resistor, and the LED lamp is simple and easy to operate. When the instantaneous voltage of the power supply module is reduced to between 1 time of LED load voltage and 2 times of LED load voltage, the IC repeats the working process, and the CDR circuit stops working. When the instantaneous voltage of the power supply module is lower than the LED load voltage, the electrolytic capacitor C has higher voltage due to the storage of electric energy, and is conducted through the MOSFET in the low-voltage single-section linear IC to form a loop with the LED string and the freewheeling diode D2, so that the release of energy is completed, and the utilization efficiency of the power supply is improved. Thus, the whole circuit completes a working period and realizes the constant current of the full voltage section. The utility model discloses a separate constant current circuit CDR and integrated constant current circuit IC's perfect adaptation, the LED constant current has been realized to the function, the cost is reduced.
The above mentioned is only the preferred embodiment of the present invention, not the limitation of the patent scope, all the equivalent structures or equivalent processes that the contents of the specification and the drawings are utilized are directly or indirectly applied to other related technical fields, and all the same principles are included in the patent protection scope of the present invention.
Claims (8)
1. A CDR current-limiting constant current LED drive circuit is characterized in that the LED drive circuit comprises
The LED lamp module is provided with an anode and a cathode, and the cathode of the LED lamp module is connected with the negative electrode of the power supply;
the LED lamp comprises a first branch circuit, wherein an electrolytic capacitor, a first diode and a first resistor are arranged on the first branch circuit in series connection, the anode of the first diode is connected with the cathode of the electrolytic capacitor, the first resistor is connected with the cathode of the electrolytic capacitor, one end of the first branch circuit, which is close to the electrolytic capacitor, is a first end of the first branch circuit, one end of the first branch circuit, which is close to the first diode, is a second end of the first branch circuit, the first end of the first branch circuit is connected with the positive electrode of a power supply, and the second end of the first branch circuit is connected with the anode of the LED lamp module;
the LED lamp comprises a first branch circuit, a second branch circuit and a power supply, wherein a linear driving chip is arranged on the first branch circuit, the linear driving chip is provided with a CS pin, a Drain pin and a GND pin, the CS pin is connected with the GND pin through a current detection resistor, one end of the second branch circuit, close to the Drain pin, is a first end of the second branch circuit, one end of the second branch circuit, close to the CS pin, is a second end of the second branch circuit, the first end of the second branch circuit is connected with a positive electrode of the power supply, a second end of the second branch circuit is connected with an anode of the LED lamp module, and the second end of the second branch circuit is positioned between the current detection resistor and the GND pin;
and the anode of the second diode is connected with the negative electrode of a power supply, and the cathode of the second diode is connected with the cathode of the electrolytic capacitor.
2. The LED driving circuit according to claim 1, wherein the electrolytic capacitor, the first diode and the first resistor are connected in series in the first branch, and the first resistor is connected to a cathode of the first diode.
3. The LED driving circuit according to claim 1, wherein the electrolytic capacitor, the first resistor and the first diode are connected in series in the first branch, and the first resistor is connected to an anode of the first diode.
4. The LED driver circuit of claim 1, wherein the LED driver circuit comprises a third transistor, an anode of the third transistor is connected to a positive power supply, and a cathode of the third transistor is connected to the first terminal of the first branch.
5. The LED driving circuit of claim 1, wherein the LED lamp module comprises a plurality of LED lamps connected end to end in series.
6. The LED driving circuit according to claim 1, wherein the first resistor is a chip resistor or a plug resistor.
7. The LED driving circuit according to claim 1, wherein the first resistor is a purely resistive linear element.
8. The LED driving circuit according to claim 1, wherein the linear driving chip is a low voltage linear constant current chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120009328.5U CN214205909U (en) | 2021-01-05 | 2021-01-05 | CDR current-limiting constant current LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120009328.5U CN214205909U (en) | 2021-01-05 | 2021-01-05 | CDR current-limiting constant current LED drive circuit |
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| CN214205909U true CN214205909U (en) | 2021-09-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112616221A (en) * | 2021-01-05 | 2021-04-06 | 红壹佰照明有限公司 | CDR current-limiting constant current LED drive circuit |
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- 2021-01-05 CN CN202120009328.5U patent/CN214205909U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112616221A (en) * | 2021-01-05 | 2021-04-06 | 红壹佰照明有限公司 | CDR current-limiting constant current LED drive circuit |
| CN112616221B (en) * | 2021-01-05 | 2024-04-12 | 红壹佰照明股份有限公司 | CDR current-limiting constant-current LED drive circuit |
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Address after: 215400 No. 33 East Qingdao Road, Taicang City, Suzhou City, Jiangsu Province Patentee after: Hongyibai Lighting Co.,Ltd. Address before: 215400 No. 33 East Qingdao Road, Taicang City, Suzhou City, Jiangsu Province Patentee before: RED100 LIGHTING CO.,LTD. |