CN215187494U - Constant current control circuit and LED circuit - Google Patents
Constant current control circuit and LED circuit Download PDFInfo
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- CN215187494U CN215187494U CN202120511164.6U CN202120511164U CN215187494U CN 215187494 U CN215187494 U CN 215187494U CN 202120511164 U CN202120511164 U CN 202120511164U CN 215187494 U CN215187494 U CN 215187494U
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- 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]
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Abstract
The utility model relates to a constant current control circuit and LED circuit. The constant current control circuit includes: the constant current unit is used for connecting a power supply and converting a power supply signal into a constant current power supply signal to be output; and the protection unit is respectively connected with the positive output end of the constant current unit and the negative output end of the constant current unit and is used for conducting the positive output end of the constant current unit and the negative output end of the constant current unit when detecting that the output current of the constant current unit reaches a preset threshold value, so that a load receiving a constant current power supply signal is bypassed. According to the constant current control circuit, the protection unit is arranged on the output side of the constant current unit of the constant current control circuit, the protection unit is used for detecting the output current of the constant current unit, and the positive output end and the negative output end of the constant current unit are conducted when the output current of the constant current unit reaches the preset threshold value, so that a load which is arranged at the rear end of the constant current unit and used for receiving a constant current power supply signal to work is bypassed, and the phenomenon that the output current is increased suddenly to damage the load due to internal reasons of the constant current unit is avoided.
Description
Technical Field
The utility model relates to a LED technical field especially relates to a constant current control circuit and LED circuit.
Background
At present, more and more electronic devices adopt an LED liquid crystal technology, and in order to ensure that the devices can stably emit light, a constant current control circuit is generally required to be arranged in an LED circuit, and when the device works, the constant current control circuit regulates input low-voltage direct current (such as 24V) to a working voltage suitable for an LED light source, and outputs the working voltage to supply power to an LED load.
The light emitting diode adopted in the LED circuit is very easy to break down and damage, so that if the output current of the constant current control circuit is increased to exceed the current limit value of the light emitting diode due to internal reasons, the light emitting diode is broken down, and the normal use of the equipment is influenced.
SUMMERY OF THE UTILITY MODEL
Therefore, it is desirable to provide a constant current control circuit and an LED circuit, which can prevent the output from exceeding the current limit of the LED and prevent the LED from being damaged.
A constant current control circuit comprising:
the constant current unit is used for connecting a power supply and converting a power supply signal into a constant current power supply signal to be output;
and the protection unit is respectively connected with the positive output end of the constant current unit and the negative output end of the constant current unit and is used for conducting the positive output end of the constant current unit and the negative output end of the constant current unit when detecting that the output current of the constant current unit reaches a preset threshold value, so that a load receiving the constant current power supply signal is bypassed.
In one embodiment, the protection unit includes:
the input end of the sampling assembly is connected with the positive output end of the constant current unit, and the output end of the sampling assembly is connected with the load and used for sampling the output current of the constant current unit;
the first end of the bypass switch is connected with the positive output end of the constant current unit, the second end of the bypass switch is connected with the negative output end of the constant current unit, the control end of the bypass switch is connected with the output end of the sampling assembly, and the bypass switch is used for conducting when the voltage at the two ends of the sampling assembly reaches the conducting voltage of the bypass switch;
when the output current of the constant current unit is larger than a preset threshold value, the voltage at two ends of the sampling assembly reaches the breakover voltage of the bypass switch.
In one embodiment, the sampling assembly comprises:
and the first end of the sampling resistor is respectively connected with the output end of the constant current unit and the first end of the bypass switch, and the second end of the sampling resistor is connected with the control end of the bypass switch.
In one embodiment, the sampling assembly further comprises:
and the first end of the first capacitor is connected with the first end of the sampling resistor, and the second end of the first capacitor is connected with the second end of the sampling resistor.
In one embodiment, the bypass switch is a PNP transistor;
the PNP triode is characterized in that an emitting electrode of the PNP triode is connected with a positive output end of the constant current unit, a collector electrode of the PNP triode is connected with a negative output end of the constant current unit, and a base electrode of the PNP triode is connected with an output end of the sampling assembly.
In one embodiment, the constant current unit comprises a second capacitor, a third capacitor, an inductor, a diode and an electronic switch;
the first end of the second capacitor is used for being connected with the power supply, and the second end of the second capacitor is connected with the first end of the electronic switch;
the first end of the third capacitor is respectively connected with the first end of the second capacitor and the positive output end of the constant current unit, and the second end of the third capacitor is connected with the negative output end of the constant current unit;
the first end of the inductor is connected with the second end of the second capacitor, and the second end of the inductor is connected with the second end of the third capacitor;
the anode of the diode is connected with the first end of the electronic switch, and the cathode of the diode is connected with the first end of the second capacitor;
the second end of the electronic switch is grounded, the control end of the electronic switch is used for receiving a control signal, and the electronic switch is used for being switched on or switched off according to the control signal.
In one embodiment, the electronic switch is an NMOS transistor,
the drain electrode of the NMOS tube is connected with the second end of the second capacitor, the anode of the diode and the first end of the inductor respectively, the source electrode of the NMOS tube is grounded, and the grid electrode of the NMOS tube is used for receiving the control signal.
In one embodiment, the second capacitor and the third capacitor are both active capacitors;
the first end of the second capacitor is a positive electrode, and the second end of the second capacitor is a negative electrode;
the first end of the third capacitor is a positive electrode, and the second end of the third capacitor is a negative electrode.
An LED circuit, comprising:
an LED load; and
according to the constant current control circuit, the input end of the LED load is connected with the positive output end of the constant current unit, and the output end of the LED load is connected with the negative output end of the constant current unit.
In one embodiment, the LED load comprises a plurality of light emitting diodes connected in series.
According to the constant current control circuit and the LED circuit, the protection unit is arranged on the output side of the constant current unit of the constant current control circuit, the protection unit is used for detecting the output current of the constant current unit, and the positive output end and the negative output end of the constant current unit are conducted when the output current of the constant current unit reaches the preset threshold value, so that a load which is arranged at the rear end of the constant current unit and used for receiving a constant current power supply signal to work is bypassed, and the phenomenon that the output current is increased suddenly due to internal reasons of the constant current unit to damage the load is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a constant current control circuit in an embodiment;
fig. 2 is a schematic structural diagram of a constant current control circuit in another embodiment;
FIG. 3 is a circuit diagram of a constant current control circuit according to an embodiment;
FIG. 4 is a schematic circuit diagram of a constant current control circuit in another embodiment;
fig. 5 is a circuit diagram of an LED circuit in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first capacitance may be referred to as a second capacitance, and similarly, a second capacitance may be referred to as a first capacitance, without departing from the scope of the present application. The first and second capacitances are both capacitances, but they are not the same capacitance.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
The inventor finds that, as the constant current unit 110 needs to provide a switching tube for constant current control when achieving the constant current, the switching tube is prone to generate an inter-electrode short circuit during operation, so that the output current of the constant current unit 110 increases sharply, and when the output current increases to exceed the operating limit of the load 200, the load 200 is damaged.
In one embodiment, as shown in fig. 1, a constant current control circuit 100 is provided, which includes a constant current unit 110 and a protection unit 120. The constant current unit 110 is used for connecting a power supply, the protection unit 120 is respectively connected with a positive output end V + of the constant current unit 110 and a negative output end V-of the constant current unit 110, and the constant current unit 110 is used for converting a power supply signal VIN output by the power supply into a constant current power supply signal and outputting the constant current power supply signal to the load 200 to supply power to the load 200; the protection unit 120 is configured to detect whether the output current of the constant current unit 110 is greater than a preset threshold, and when it is detected that the output current of the constant current unit 110 reaches the preset threshold, conduct the positive output terminal V + of the constant current unit 110 and the negative output terminal V-of the constant current unit 110, so that the load 200 is bypassed, and the load 200 is prevented from being damaged due to the fact that the current flowing through the load 200 exceeds the working limit thereof.
In the constant current control circuit 100, the protection unit 120 is arranged on the output side of the constant current unit 110 of the constant current control circuit 100, the protection unit 120 is used for detecting the output current of the constant current unit 110, and the positive output end V + and the negative output end V-of the constant current unit 110 are conducted when the output current of the constant current unit 110 reaches the preset threshold value, so that the load 200 which is arranged at the rear end of the constant current unit 110 and receives the constant current power supply signal to work is bypassed, and the load 200 is prevented from being damaged due to the fact that the output current is increased suddenly due to internal reasons of the constant current unit 110.
In one embodiment, as shown in fig. 2, the protection unit 120 includes a sampling component 121 and a bypass switch 122. The input end of the sampling component 121 is connected to the positive output end V + of the constant current unit 110, and the output end of the sampling component 121 is used for connecting to the load 200, that is, the positive output end V + of the constant current unit 110 is connected to the load 200 through the sampling component 121; the first end of the bypass switch 122 is connected to the positive output terminal V + of the constant current unit 110, the second end of the bypass switch 122 is connected to the negative output terminal V-of the constant current unit 110, and the control end of the bypass switch 122 is connected to the output terminal of the sampling component 121. Since the sampling component 121 and the load 200 are connected in series, the current flowing through the sampling component 121 and the load 200 is equal, when the resistance value of the sampling component 121 is fixed, the larger the current is, the larger the voltage across the sampling component 121 is, and the bypass switch 122 is turned on when the voltage drop between the first end and the control end reaches the on condition thereof, that is, when the voltage across the sampling component 121 reaches the on voltage of the bypass switch 122, the bypass switch 122 is turned on. The product of the preset threshold and the resistance of the sampling element 121 is equal to the turn-on voltage of the bypass switch 122.
In one embodiment, as shown in FIG. 3, the sampling component 121 includes a sampling resistor R1. A first end of the sampling resistor R1 is connected to the positive output terminal V + of the constant current unit 110 and a first end of the bypass switch 122, respectively, and a second end of the sampling resistor R1 is connected to a control terminal of the bypass switch 122.
In one embodiment, the sampling component 121 further includes a first capacitor C1. A first terminal of the first capacitor C1 is connected to a first terminal of the sampling resistor R1, and a second terminal of the first capacitor C1 is connected to a second terminal of the sampling resistor R1. The first capacitor C1 can adjust the protection sensitivity of the protection unit 120, and the larger the capacitance value of the first capacitor C1 is, the lower the sensitivity is, and those skilled in the art can set the sensitivity according to specific needs.
Specifically, the bypass switch 122 may be a PNP transistor as shown in fig. 3, or may be other switching transistors, such as an NPN transistor, an MOS transistor, and the like. When the bypass switch 122 is a PNP triode, an emitter of the PNP triode is connected to the positive output terminal V + of the constant current unit 110 as a first terminal, a collector of the PNP triode is connected to the negative output terminal V-of the constant current unit 110 as a second terminal, and a base of the PNP triode is connected to the output terminal of the sampling component 121 as a control terminal.
In one embodiment, referring to fig. 3 and 4, the constant current unit 110 includes a second capacitor C2, a third capacitor C3, an inductor L, a diode D1, and an electronic switch Q1. A first end of the second capacitor C2 is used for connecting a power supply, and a second end of the second capacitor C2 is connected with a first end of the electronic switch Q1; a first end of the third capacitor C3 is connected to a first end of the second capacitor C2 and the positive output terminal V + of the constant current unit 110, respectively, and a second end of the third capacitor C3 is connected to the negative output terminal V-of the constant current unit 110; a first end of the inductor L is connected with a second end of the second capacitor C2, and a second end of the inductor L is connected with a second end of the third capacitor C3; the anode of the diode D1 is connected with the first end of the electronic switch Q1, and the cathode of the diode D1 is connected with the first end of the second capacitor C2; the second terminal of the electronic switch Q1 is grounded, the control terminal of the electronic switch Q1 is used for receiving a control signal, and the electronic switch Q1 is turned on or off according to the control signal. Wherein the control signal can be sent out by a controller in the LED circuit applying the constant current control circuit 100.
Specifically, the electronic switch Q1 may be an NMOS transistor as shown in fig. 3, or may be other switch transistors, such as a PMOS transistor, a triode, and the like. When the electronic switch Q1 is an NMOS transistor, the drain of the NMOS transistor is connected to the second end of the second capacitor C2 as the first end, the source of the NMOS transistor is grounded as the second end, the gate of the NMOS transistor is used as the control end for receiving a control signal, and when the control signal is a high level signal, the NMOS transistor is turned on; when the control signal is a high level signal, the NMOS transistor is turned off, and the output of the constant current unit 110 is adjusted by controlling the on and off of the NMOS transistor, so as to realize constant current power supply.
In one embodiment, the second capacitor C2 and the third capacitor C3 are both active capacitors. The first end of the second capacitor C2 is a positive electrode, the second end of the second capacitor C2 is a negative electrode, and the second capacitor C2 can stabilize the power signal. The first end of the third capacitor C3 is a positive electrode, the second end of the third capacitor C3 is a negative electrode, and the charging or discharging of the third capacitor C3 and the inductor L is controlled by controlling the on-off of the electronic switch Q1, so that the constant current output is realized.
Referring to fig. 1 and 5, an input terminal of the LED load 200 is connected to the positive output terminal V + of the constant current unit 110, and an output terminal of the LED load 200 is connected to the negative output terminal V-of the constant current unit 110. When the output current of the constant current unit 110 reaches a preset threshold, the protection unit 120 conducts the positive output terminal V + and the negative output terminal V-of the constant current unit 110, so that the LED load 200 is bypassed, which is equivalent to the LED load 200 being short-circuited, thereby preventing the current exceeding the working limit from being output to the LED load 200 and protecting the LED load 200 from being damaged.
In one embodiment, the LED load 200 includes a plurality of light emitting diodes connected in series. Taking three light emitting diodes as an example, an anode of the first light emitting diode is used as an input terminal of the LED load 200, a cathode of the first light emitting diode is connected to an anode of the second light emitting diode, a cathode of the second light emitting diode is connected to an anode of the third light emitting diode, and a cathode of the third light emitting diode is used as an output terminal of the LED load 200.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A constant current control circuit, comprising:
the constant current unit is used for connecting a power supply and converting a power supply signal into a constant current power supply signal to be output;
and the protection unit is respectively connected with the positive output end of the constant current unit and the negative output end of the constant current unit and is used for conducting the positive output end of the constant current unit and the negative output end of the constant current unit when detecting that the output current of the constant current unit reaches a preset threshold value, so that a load receiving the constant current power supply signal is bypassed.
2. The constant current control circuit according to claim 1, wherein the protection unit includes:
the input end of the sampling assembly is connected with the positive output end of the constant current unit, and the output end of the sampling assembly is connected with the load and used for sampling the output current of the constant current unit;
the first end of the bypass switch is connected with the positive output end of the constant current unit, the second end of the bypass switch is connected with the negative output end of the constant current unit, the control end of the bypass switch is connected with the output end of the sampling assembly, and the bypass switch is used for conducting when the voltage at the two ends of the sampling assembly reaches the conducting voltage of the bypass switch;
when the output current of the constant current unit reaches a preset threshold value, the voltage at two ends of the sampling assembly reaches the breakover voltage of the bypass switch.
3. The constant current control circuit of claim 2, wherein the sampling component comprises:
and the first end of the sampling resistor is respectively connected with the output end of the constant current unit and the first end of the bypass switch, and the second end of the sampling resistor is connected with the control end of the bypass switch.
4. The constant current control circuit of claim 3, wherein the sampling component further comprises:
and the first end of the first capacitor is connected with the first end of the sampling resistor, and the second end of the first capacitor is connected with the second end of the sampling resistor.
5. The constant current control circuit according to claim 2, wherein the bypass switch is a PNP transistor;
the PNP triode is characterized in that an emitting electrode of the PNP triode is connected with a positive output end of the constant current unit, a collector electrode of the PNP triode is connected with a negative output end of the constant current unit, and a base electrode of the PNP triode is connected with an output end of the sampling assembly.
6. The constant current control circuit according to claim 1, wherein the constant current unit comprises a second capacitor, a third capacitor, an inductor, a diode and an electronic switch;
the first end of the second capacitor is used for being connected with the power supply, and the second end of the second capacitor is connected with the first end of the electronic switch;
the first end of the third capacitor is respectively connected with the first end of the second capacitor and the positive output end of the constant current unit, and the second end of the third capacitor is connected with the negative output end of the constant current unit;
the first end of the inductor is connected with the second end of the second capacitor, and the second end of the inductor is connected with the second end of the third capacitor;
the anode of the diode is connected with the first end of the electronic switch, and the cathode of the diode is connected with the first end of the second capacitor;
the second end of the electronic switch is grounded, the control end of the electronic switch is used for receiving a control signal, and the electronic switch is used for being switched on or switched off according to the control signal.
7. The constant current control circuit according to claim 6, wherein the electronic switch is an NMOS transistor,
the drain electrode of the NMOS tube is connected with the second end of the second capacitor, the anode of the diode and the first end of the inductor respectively, the source electrode of the NMOS tube is grounded, and the grid electrode of the NMOS tube is used for receiving the control signal.
8. The constant current control circuit according to claim 6, wherein the second capacitor and the third capacitor are both active capacitors;
the first end of the second capacitor is a positive electrode, and the second end of the second capacitor is a negative electrode;
the first end of the third capacitor is a positive electrode, and the second end of the third capacitor is a negative electrode.
9. An LED circuit, comprising:
an LED load; and
the constant current control circuit as claimed in any one of claims 1 to 8, wherein an input terminal of the LED load is connected to a positive output terminal of the constant current unit, and an output terminal of the LED load is connected to a negative output terminal of the constant current unit.
10. The LED circuit of claim 9 wherein the LED load comprises a plurality of light emitting diodes connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120511164.6U CN215187494U (en) | 2021-03-10 | 2021-03-10 | Constant current control circuit and LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120511164.6U CN215187494U (en) | 2021-03-10 | 2021-03-10 | Constant current control circuit and LED circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215187494U true CN215187494U (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120511164.6U Active CN215187494U (en) | 2021-03-10 | 2021-03-10 | Constant current control circuit and LED circuit |
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| CN (1) | CN215187494U (en) |
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- 2021-03-10 CN CN202120511164.6U patent/CN215187494U/en active Active
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