CN211019369U

CN211019369U - L ED control circuit

Info

Publication number: CN211019369U
Application number: CN201922069857.XU
Authority: CN
Inventors: 付文贺
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-07-14
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses an L ED control circuit, including rectifier module, vary voltage module and PWM control module, the input of vary voltage module and rectifier module's output electric connection, the output of vary voltage module and the output electric connection of circuit, the output power supply after stepping down to the voltage that rectifier module input came in, PWM control module respectively with rectifier module and vary voltage module electric connection, PWM control module includes control chip U1, sampling resistor R10 and sampling resistor R11 and triode Q1, realizes through triode Q1's temperature characteristic that the excess temperature falls the power protection and realizes through the voltage characteristic between triode Q1 base and the projecting pole that the low pressure falls the power protection, has simple structure, and the advantage that protection effect is good and manufacturing cost is low.

Description

L ED control circuit

Technical Field

The utility model relates to an L ED control circuit field.

Background

L ED lamps usually need a control circuit to control the brightness and safety of the lamps, when L ED lamps are used under low voltage and over-temperature conditions, L ED lamps will be damaged, the existing L ED control circuit usually solves the above problems by adding a control chip with complex functions into the L ED circuit and protecting L ED lamps under over-temperature and low voltage conditions through the control chip, but the solution has the disadvantages of complex control principle of the chip and peripheral circuits thereof and higher production cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide an L ED control circuit, realize protecting L ED lamp under the condition of low pressure and excess temperature, have low in production cost's advantage simultaneously.

An embodiment of the present invention adopts the technical solution to solve the technical problem that an L ED control circuit comprises:

the rectification module is electrically connected with an external power supply;

the input end of the voltage transformation module is electrically connected with the output end of the rectification module, and the output end of the voltage transformation module is electrically connected with the output end of the circuit and used for outputting and supplying power after the voltage input by the rectification module is reduced;

PWM control module, respectively with rectifier module and vary voltage module electric connection, PWM control module includes control chip U1, sampling resistor R10 and sampling resistor R11 and triode Q1, control chip U1's voltage input end and rectifier module output electric connection, control chip U1's voltage output end and vary voltage module's input electric connection, sampling resistor R10's one end and control chip U1's first sample end electric connection, sampling resistor R10's the other end respectively with sampling resistor R11's one end and triode Q1 base electric connection, triode Q1's projecting pole and collecting electrode respectively with control chip U1's compensation end electric connection.

Preferably, the rectifying module includes a rectifying diode D1, a rectifying diode D2, a rectifying diode D3 and a rectifying diode D4, an anode of the rectifying diode D1 is electrically connected to one end of the external power source and an anode of the rectifying diode D4, a cathode of the rectifying diode D1 is electrically connected to an anode of the rectifying diode D2, the transforming module and the PWM control module, a cathode of the rectifying diode D2 is electrically connected to the other end of the external power source and a cathode of the rectifying diode D3, and an anode of the rectifying diode D3 is electrically connected to a ground terminal and a cathode of the rectifying diode D4.

Preferably, the transformer module includes a transformer T1, the transformer T1 includes a primary winding N1 and a secondary winding N2, one input end of the primary winding N1 is electrically connected to the rectifier module, the other input end of the primary winding N1 is electrically connected to the PWM control module, and an output end of the secondary winding N2 is electrically connected to an output end of the circuit.

Further, the power supply module is further included, and the power supply module includes a secondary coil N3 coupled with the primary coil N1, and the secondary coil N3 includes a first output terminal, and the first output terminal is electrically connected with the rectifying module and the PWM control module respectively.

Preferably, the detection module comprises a sampling resistor R3 and a sampling resistor R8, the secondary coil N3 further comprises a second output end, the control chip U1 further comprises a second sampling end, one end of the sampling resistor R3 is electrically connected with the second output end of the secondary coil N3, and the other end of the sampling resistor R3 is electrically connected with the second sampling end of the control chip U1, one end of the sampling resistor R8, the other end of the sampling resistor R8 and the ground end respectively.

Preferably, the protection device further comprises a protection module, wherein the protection module comprises a fuse F1, a fuse F2, a fuse F3, a piezoresistor RV1 and a piezoresistor RV2, one end of the fuse F1 is electrically connected with one end of a fuse F2 and one end of an external power supply respectively, the other end of the fuse F2 is electrically connected with one end of a rectifier module and one end of the fuse F3 respectively, the other end of the fuse F3 is in telecommunication connection with one end of the piezoresistor RV2, the other end of the piezoresistor RV2 is electrically connected with the other end of the external power supply and one end of the piezoresistor RV1 respectively, and the other end of the piezoresistor RV1 is electrically connected with the other end of the fuse F1.

Preferably, the PWM driving circuit further comprises a filter module, the filter module comprises a filter capacitor C3, a resistor R6 and a resistor R7, an end of the capacitor C3 is electrically connected to the rectifier module, an end of the resistor R6, an end of the resistor R7 and the transformer module, and another end of the filter capacitor C3 is electrically connected to the other end of the resistor R6, the other end of the resistor R7 and the PWM control module.

Furthermore, the transformer module further comprises a diode D7, a diode D8, a diode D9 and a diode D10 which are connected in parallel, wherein one end of the parallel connection is electrically connected with the output end of the transformer module, and the other end of the parallel connection is electrically connected with the output end of the circuit.

Furthermore, the rectifier module further comprises a bypass capacitor C2, wherein one end of the bypass capacitor C2 is electrically connected to the output end of the rectifier module and the input end of the transformer module, and the other end of the bypass capacitor C2 is electrically connected to the ground end.

Preferably, the bypass capacitor C2 is configured as a polypropylene film capacitor.

The beneficial effects of the utility model are that an L ED control circuit, including rectifier module, vary voltage module and PWM control module, the input of vary voltage module and rectifier module's output electric connection, the output of vary voltage module and the output electric connection of circuit, carry out the output power supply after stepping down to the voltage that rectifier module input came in, PWM control module respectively with rectifier module and vary voltage module electric connection, PWM control module includes control chip U1, sampling resistor R10 and sampling resistor R11 and triode Q1, realize through triode Q1's temperature characteristic that the power protection falls in excess temperature and realize the low pressure through the voltage characteristic between triode Q1 base and the projecting pole and fall the power protection, have simple structure, the advantage that protection effect is good and manufacturing cost is low.

Drawings

The present invention will be further described with reference to the accompanying drawings and examples;

fig. 1 is an overall circuit diagram of an L ED control circuit.

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 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 drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

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 invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, terms such as "mounted," "connected," and "fixed" are to be construed broadly, e.g., as a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected through the interior of two elements or through the interaction of two elements unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or indirectly contacting the first feature and the second feature through intervening media, and the first feature "on", "above" or "above" the second feature may be directly or obliquely above the second feature or may merely indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, an L ED control circuit includes:

the rectifier module 10 is electrically connected with an external power supply;

the input end of the transformation module 20 is electrically connected with the output end of the rectification module 10, the output end of the transformation module 20 is electrically connected with the output end of the circuit, and the input voltage of the rectification module 10 is subjected to voltage reduction and then output for power supply;

PWM control module 30, respectively with rectifier module 10 and transformer module 20 electric connection, PWM control module 30 includes control chip U1, sampling resistor R10 and sampling resistor R11 and triode Q1, control chip U1's voltage input end and rectifier module 10 output electric connection, control chip U1's voltage output end and transformer module 20's input electric connection, the one end of sampling resistor R10 and control chip U1's first sample end electric connection, sampling resistor R10's the other end respectively with sampling resistor R11's one end and triode Q1 base electric connection, triode Q1's emitter and collecting electrode respectively with control chip U1's compensation end electric connection.

The utility model discloses in, the voltage of external power source input is the power supply of vary voltage module 20 after rectifier module 10's processing, vary voltage module 20 is L ED lamp power supply after carrying out the step-down processing to the voltage of input, still include PWM control module, control chip U1 can output PWM adjusting signal and control the voltage size of exporting L ED lamp, because triode Q1 has temperature characteristic, when the ambient temperature that triode Q1 is located is higher, the operating voltage of triode will be lower, when the temperature is high to surpassing safe value, triode Q1 will receive the influence of temperature characteristic and reduce the voltage of triode Q1 collector end, thereby reduce this point power, and then reduce the voltage or the power of output, when the external voltage reduces, the peak current that flows through resistance R9 in the circuit will increase, exceed the V of triode Q1 and the voltage of V1_BEThe turn-on of the transistor limits the power, thereby reducing the voltage or power at the collector terminal of the transistor Q1, and thus the voltage or power at the output,the utility model discloses compare the excess temperature that the chip integrated, low-voltage protection circuit, have simple structure's advantage.

The rectifying module 10 includes a rectifying diode D1, a rectifying diode D2, a rectifying diode D3 and a rectifying diode D4, wherein an anode of the rectifying diode D1 is electrically connected to one end of an external power source and an anode of the rectifying diode D4, a cathode of the rectifying diode D1 is electrically connected to an anode of the rectifying diode D2, the transforming module 20 and the PWM control module 30, a cathode of the rectifying diode D2 is electrically connected to the other end of the external power source and a cathode of the rectifying diode D3, and an anode of the rectifying diode D3 is electrically connected to a ground terminal and a cathode of the rectifying diode D4; the rectifying module 10 can rectify the voltage input by the external power supply by matching the rectifying diode D1, the rectifying diode D2, the rectifying diode D3 and the rectifying diode D4, so as to provide voltage for the subsequent circuits.

The transformation module 20 comprises a transformer T1, the transformer T1 comprises a primary coil N1 and a secondary coil N2, one input end of the primary coil N1 is electrically connected with the rectification module 10, the other input end of the primary coil N1 is electrically connected with the PWM control module 30, the output end of the secondary coil N2 is electrically connected with the output end of the circuit, and the secondary coil N2 end of the transformer TI outputs proper voltage to supply power to an external L ED lamp.

The L ED control circuit further comprises a power supply module 40, wherein the power supply module 40 comprises a secondary coil N3 coupled with a primary coil N1, the secondary coil N3 comprises a first output end which is respectively and electrically connected with the rectifying module 10 and the PWM control module 30, and a secondary coil N3 of a transformer T1 is coupled with the primary coil N1 and obtains voltage to provide required working voltage for the control chip U1.

The L ED control circuit further comprises a detection module 50, the detection module 50 comprises a sampling resistor R3 and a sampling resistor R8, the secondary coil N3 further comprises a second output end, the control chip U1 further comprises a second sampling end, one end of the sampling resistor R3 is electrically connected with the second output end of the secondary coil N3, the other end of the sampling resistor R3 is electrically connected with the second sampling end of the control chip U1, one end of the sampling resistor R8, the other end of the sampling resistor R8 and a ground end, zero-crossing detection and overvoltage detection can be achieved through the detection module 50, and voltage division on the sampling resistor R3 and the sampling resistor R8 is used for achieving detection.

The L ED control circuit further comprises a protection module 60, the protection module 60 comprises a fuse F1, a fuse F2, a fuse F3, a varistor RV1 and a varistor RV2, one end of the fuse F1 is electrically connected with one end of a fuse F2 and one end of an external power supply respectively, the other end of the fuse F2 is electrically connected with one end of a rectifier module 10 and one end of a fuse F3 respectively, the other end of the fuse F3 is electrically connected with one end of a varistor RV2, the other end of the varistor RV2 is electrically connected with the other end of the external power supply and one end of a varistor RV1 respectively, and the other end of the varistor RV1 is electrically connected with the other end of the fuse F1, the present invention adopts double protection, when the first fuse F1 is electrically connected in series with the varistor RV1, the varistor RV1 can absorb overvoltage, when the overvoltage exceeds the absorption limit or the RV or the varistor RV 72 fails, the fuse F1 can still absorb the overvoltage, when the overvoltage of the varistor F1 and the overvoltage of the circuit is still, the overvoltage of the fuse F1, the overvoltage protection circuit can still can be considered as a normal lightning protection circuit, when the overvoltage absorption circuit, the overvoltage of the overvoltage protection circuit can still can be considered as well as a lightning stroke protection circuit, when the overvoltage absorption protection circuit can be considered as a circuit, the overvoltage protection circuit can still can be considered as a circuit, when the overvoltage protection circuit can still, the overvoltage protection circuit can be considered as a circuit can be replaced by a circuit, and a circuit, when the overvoltage protection circuit can be replaced by a circuit, the overvoltage protection circuit can be.

The L ED control circuit further comprises a filtering module 70, wherein the filtering module 70 comprises a filtering capacitor C3, a resistor R6 and a resistor R7, the end of the capacitor C3 is electrically connected with the rectifying module 10, one end of the resistor R6, one end of the resistor R7 and the transforming module 20 respectively, the other end of the filtering capacitor C3 is electrically connected with the other end of the resistor R6, the other end of the resistor R7 and the PWM control module 30 respectively, and the filtering module 70 filters high frequency and ripples of the voltage output by the rectifying module 10 and provides the voltage quality output to the transforming module 20 and the PWM control module 30.

The L ED control circuit further comprises a diode D7, a diode D8, a diode D9 and a diode D10 which are connected in parallel, wherein one end of the diode D7, the diode D8, the diode D9 and the diode D10 are electrically connected with the output end of the voltage transformation module 20 in parallel, the other end of the diode D9 is electrically connected with the output end of the circuit in parallel, the anode of the diode D7, the anode of the diode D8, the anode of the diode D9 and the anode of the diode D10 are connected together at one point, the cathode of the diode D7, the cathode of the diode D8, the cathode of the diode D9 and the cathode of the diode D10 are connected together at one point, one end of the anode which is connected with the output end of the voltage transformation module 20 is electrically connected with the cathode, the one end of the cathode which is connected with the output end of the circuit in parallel is electrically connected with a plurality of diodes, the diodes which are.

The L ED control circuit further comprises a bypass capacitor C2, one end of the bypass capacitor C2 is electrically connected with the output end of the rectifying module 10 and the input end of the voltage transformation module 20 respectively, the other end of the bypass capacitor C2 is electrically connected with the ground end, the bypass capacitor C2 is a polypropylene film capacitor, the polypropylene film capacitor has the advantages of no polarity, high insulation impedance and excellent frequency characteristic (wide frequency response), medium loss is low, based on the advantages, the polypropylene film capacitor can ensure that when signals are transmitted, the situation of large distortion cannot occur, the polypropylene film capacitor is high in dielectric constant, small in size, large in capacity and good in stability, and is suitable for being used as the bypass capacitor.

In the description of the present specification, reference to descriptions pertaining to "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means 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 present invention. In this description, schematic representations of the above terms are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples, and one skilled in the art may combine or combine features of different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

While embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. An L ED control circuit, comprising:

the rectifier module (10) is electrically connected with an external power supply;

the input end of the transformation module (20) is electrically connected with the output end of the rectification module (10), the output end of the transformation module (20) is electrically connected with the output end of the circuit, and the input voltage of the rectification module (10) is subjected to voltage reduction and then output for power supply;

PWM control module (30), respectively with rectifier module (10) and vary voltage module (20) electric connection, PWM control module (30) includes control chip U1, sampling resistor R10 and sampling resistor R11 and triode Q1, control chip U1's voltage input end and rectifier module (10) output electric connection, control chip U1's voltage output end and vary voltage module (20)'s input electric connection, the one end of sampling resistor R10 and control chip U1's first sample end electric connection, the other end of sampling resistor R10 respectively with sampling resistor R11's one end and triode Q1 base electric connection, the projecting pole and the collecting electrode of triode Q1 respectively with control chip U1's compensation end electric connection.

2. The L ED control circuit of claim 1, wherein the rectifying module (10) includes a rectifying diode D1, a rectifying diode D2, a rectifying diode D3 and a rectifying diode D4, the anode of the rectifying diode D1 is electrically connected to one end of an external power source and the anode of the rectifying diode D4, the cathode of the rectifying diode D1 is electrically connected to the anode of the rectifying diode D2, the transforming module (20) and the PWM control module (30), the cathode of the rectifying diode D2 is electrically connected to the other end of the external power source and the cathode of the rectifying diode D3, and the anode of the rectifying diode D3 is electrically connected to ground and the cathode of the rectifying diode D4.

3. The L ED control circuit of claim 1, wherein the transforming module (20) includes a transformer T1, the transformer T1 includes a primary winding N1 and a secondary winding N2, one input terminal of the primary winding N1 is electrically connected to the rectifying module (10), the other input terminal of the primary winding N1 is electrically connected to the PWM control module (30), and the output terminal of the secondary winding N2 is electrically connected to the output terminal of the circuit.

4. An L ED control circuit according to claim 3, further comprising a power supply module (40), wherein the power supply module (40) includes a secondary winding N3 coupled to the primary winding N1, and the secondary winding N3 includes a first output terminal electrically connected to the rectifying module (10) and the PWM control module (30), respectively.

5. The L ED control circuit of claim 4, further comprising a detection module (50), wherein the detection module (50) includes a sampling resistor R3 and a sampling resistor R8, the secondary coil N3 further includes a second output terminal, the control chip U1 further includes a second sampling terminal, one end of the sampling resistor R3 is electrically connected to the second output terminal of the secondary coil N3, and the other end of the sampling resistor R3 is electrically connected to the second sampling terminal of the control chip U1, one end of the sampling resistor R8, the other end of the sampling resistor R8, and a ground terminal, respectively.

6. The L ED control circuit of claim 1, further comprising a protection module (60), wherein the protection module (60) comprises a fuse F1, a fuse F2, a fuse F3, a voltage dependent resistor RV1 and a voltage dependent resistor RV2, one end of the fuse F1 is electrically connected to one end of the fuse F2 and one end of an external power supply respectively, the other end of the fuse F2 is electrically connected to the rectifier module (10) and one end of the fuse F3 respectively, the other end of the fuse F3 is electrically connected to one end of the voltage dependent resistor RV2, the other end of the voltage dependent resistor RV2 is electrically connected to the other end of the external power supply and one end of the voltage dependent resistor RV1 respectively, and the other end of the voltage dependent resistor RV1 is electrically connected to the other end of the fuse F1.

7. The L ED control circuit of claim 1, further comprising a filter module (70), wherein the filter module (70) includes a filter capacitor C3, a resistor R6 and a resistor R7, an end of the capacitor C3 is electrically connected to the rectifier module (10), an end of the resistor R6, an end of the resistor R7 and the transformer module (20), respectively, and another end of the filter capacitor C3 is electrically connected to another end of the resistor R6, another end of the resistor R7 and the PWM control module (30), respectively.

8. The L ED control circuit of claim 1, further comprising a diode D7, a diode D8, a diode D9, and a diode D10 connected in parallel, wherein one end of the parallel connection is electrically connected to the output terminal of the transformer module (20), and the other end of the parallel connection is electrically connected to the output terminal of the circuit.

9. The L ED control circuit of claim 1, further comprising a bypass capacitor C2, wherein one end of the bypass capacitor C2 is electrically connected to the output terminal of the rectifying module (10) and the input terminal of the transforming module (20), and the other end of the bypass capacitor C2 is electrically connected to the ground terminal.

10. The L ED control circuit of claim 9, wherein the bypass capacitor C2 is a polypropylene film capacitor.