CN205565687U - Protection circuit of LED device - Google Patents
Protection circuit of LED device Download PDFInfo
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- CN205565687U CN205565687U CN201521132692.1U CN201521132692U CN205565687U CN 205565687 U CN205565687 U CN 205565687U CN 201521132692 U CN201521132692 U CN 201521132692U CN 205565687 U CN205565687 U CN 205565687U
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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 provides a protection circuit of LED device, this circuit includes: first comparator, guard signal produces the circuit, a sample voltage acquisition circuit and a reference voltage acquisition circuit, the first input end of first comparator is connected with sample voltage acquisition circuit's output, the second input and a reference voltage acquisition circuit's the output of first comparator are connected, the output and the input that guard signal produced the circuit of first comparator are connected, first comparator is used for carrying out the comparison to a reference voltage of the sample voltage of sample voltage acquisition circuit output and reference voltage acquisition circuit output, and according to comparative result output pulse signal, guard signal produces the circuit and is used for pulse signal satisfies production guard signal when predetermineeing the condition. The utility model discloses can realize turn -offing output load when the light modulator angle diminishes for light modulator and output load are effectively protected.
Description
Technical field
The utility model relates to electronic technology, particularly relates to the protection circuit of a kind of LED matrix.
Background technology
Owing to existing room lighting electric power system is the most all connected to light modulator, but a lot of light emitting diode (Light Emitting Diode in prior art, it is called for short LED) drive the incompatible light modulator of power supply, if in use light modulator angle is turned down it is possible to occur that lamp cisco unity malfunction or lamp and light modulator have the situation of damage to occur.
Utility model content
The utility model provides the protection circuit of a kind of LED matrix, for the problem solving to damage light modulator and LED when light modulator angle diminishes.
The protection circuit of the LED matrix that the utility model provides is used for after LED matrix connects light modulator protecting LED drive power or LED matrix, including: the first comparator, protection signal generating circuit, sampled voltage Acquisition Circuit and the first reference voltage Acquisition Circuit；
The first input end of described first comparator is connected with the output of described sampled voltage Acquisition Circuit; second input of described first comparator is connected with the output of described first reference voltage Acquisition Circuit, and the output of described first comparator is connected with the input of described protection signal generating circuit；
Described first comparator, the first reference voltage for the sampled voltage exporting described sampled voltage Acquisition Circuit and described first reference voltage Acquisition Circuit output compares, and according to comparative result output pulse signal, wherein, the first reference voltage of described first reference voltage Acquisition Circuit output becomes preset ratio with the input voltage of described light modulator；
Described protection signal generating circuit, for receiving the described pulse signal of described first comparator output, and produces protection signal when described pulse signal meets pre-conditioned, and described protection signal is for turning off the output loading being connected with described light modulator.
Further, described protection signal generating circuit includes: the second comparator, the second reference voltage Acquisition Circuit and filter circuit；
Correspondingly, the output of described first comparator is connected with the input of described protection signal generating circuit, particularly as follows:
The output of described first comparator is connected with the input of described filter circuit, and the first input end of described second comparator is connected with the output of described filter circuit；
Second input of described second comparator is connected with the output of described second reference voltage Acquisition Circuit；The output of described second comparator is used for exporting described protection signal.
Further, described protection signal generating circuit includes: single-chip microcomputer；
Correspondingly, the output of described first comparator is connected with the input of described protection signal generating circuit, particularly as follows: the output of described first comparator is connected with the input of described single-chip microcomputer；
Described single-chip microcomputer is for protecting signal described in the described output of pulse signal according to described first comparator output.
Further, described circuit also includes: rectifier bridge, circuit for power conversion；Wherein, first end of described light modulator is connected with the first input end of described rectifier bridge, second end of described light modulator is connected with the second input of described rectifier bridge, first output of described rectifier bridge is connected with the first input end of described circuit for power conversion, and the second output of described rectifier bridge is connected with the second input of described circuit for power conversion；
The input of described sampled voltage Acquisition Circuit is connected on the connecting line between the first end of described light modulator and the first input end of described rectifier bridge；Or,
The input of described sampled voltage Acquisition Circuit is connected on the connecting line between the second end of described light modulator and the second input of described rectifier bridge；Or,
The input of described sampled voltage Acquisition Circuit is connected on the connecting line between the first output of described rectifier bridge and the first input end of described circuit for power conversion.
Further, described sampled voltage Acquisition Circuit includes: the first resistance and the second resistance with described first resistant series；
First end of described first resistance is as the input of described sampled voltage Acquisition Circuit；
Second end of described first resistance is connected with the first end of described second resistance, and the output of described sampled voltage Acquisition Circuit is on the connecting line between second end and the first end of described second resistance of described first resistance.
Further, the input of described first reference voltage Acquisition Circuit is connected on the connecting line between the first end of described light modulator and the first input end of described rectifier bridge；Or,
The input of described first reference voltage Acquisition Circuit is connected on the connecting line between the second end of described light modulator and the second input of described rectifier bridge；Or,
The input of described first reference voltage Acquisition Circuit is connected on the connecting line between the first output of described rectifier bridge and the first input end of described circuit for power conversion.
Further, described first reference voltage Acquisition Circuit includes: the first diode, the 3rd resistance, the 4th resistance and the first electric capacity；
First end of described first diode is as the input of described first reference voltage Acquisition Circuit；
First end of described 3rd resistance and the second end of described first diode connect, the first end of described 4th resistance and the second end series connection of described 3rd resistance；
Described first electric capacity is with described 3rd resistance and described 4th resistor coupled in parallel；
The output of described first reference voltage Acquisition Circuit is on the connecting line between second end and the first end of described 4th resistance of described 3rd resistance.
Further, the protection circuit of described LED matrix also includes: the first load and the first load control circuit with described first load in series；
The first input end of described first load is connected with the output of described protection signal generating circuit；
Second input of described first load is connected on the connecting line between the first end of described light modulator and the first input end of described rectifier bridge；Or,
Second input of described first load is connected on the connecting line between the second end of described light modulator and the second input of described rectifier bridge；Or,
Second input of described first load is connected on the connecting line between the first output of described rectifier bridge and the first input end of described circuit for power conversion；
The output of described first load is connected with described first load control circuit；
Described first load, for when described protection signal turns off the output loading being connected with described light modulator, for described dimmer powered.
The protection circuit of LED matrix provided by the utility model; the pulse signal corresponding with light modulator angle state is produced by the first comparator; and by protection signal generating circuit, this pulse signal is detected; protection signal is produced when this pulse signal meets pre-conditioned; thus realizing turning off output loading when light modulator angle diminishes so that light modulator and output loading are effectively protected.
Accompanying drawing explanation
In order to be illustrated more clearly that the utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the protection circuit embodiment one of the LED matrix that Fig. 1 provides for the utility model；
The structural representation of the protection circuit embodiment two of the LED matrix that Fig. 2 provides for the utility model；
The structural representation of the protection circuit embodiment three of the LED matrix that Fig. 3 provides for the utility model；
The structural representation of the protection circuit embodiment four of the LED matrix that Fig. 4 (a) provides for the utility model；
The connection diagram of the protection circuit embodiment four of the LED matrix that Fig. 4 (b) provides for the utility model；
The structural representation of the protection circuit embodiment five of the LED matrix that Fig. 5 (a) provides for the utility model；
The connection diagram of the protection circuit embodiment five of the LED matrix that Fig. 5 (b) provides for the utility model；
The structural representation of the protection circuit embodiment six of the LED matrix that Fig. 6 (a) provides for the utility model；
The connection diagram of the protection circuit embodiment six of the LED matrix that Fig. 6 (b) provides for the utility model；
The schematic flow sheet of the guard method embodiment one of the LED matrix that Fig. 7 provides for the utility model；
The schematic flow sheet of the guard method embodiment two of the LED matrix that Fig. 8 provides for the utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the utility model rather than whole embodiments.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of the utility model protection.
The structural representation of the protection circuit embodiment one of the LED matrix that Fig. 1 provides for the utility model; as shown in Figure 1; this circuit is for protecting LED drive power or LED matrix after LED matrix connects light modulator 1, and this circuit includes: the first comparator 2, protection signal generating circuit 3, sampled voltage Acquisition Circuit 4 and the first reference voltage Acquisition Circuit 5.
The first input end of the first comparator 2 is connected with the output of sampled voltage Acquisition Circuit 4; second input of the first comparator 2 and the output of the first reference voltage Acquisition Circuit 5 connect, and the output of the first comparator 2 is connected with the input of protection signal generating circuit 3.
First comparator 2, for comparing the first reference voltage of the sampled voltage of sampled voltage Acquisition Circuit 4 output and the output of the first reference voltage Acquisition Circuit 5, and according to comparative result output pulse signal.
Protection signal generating circuit 3, for receiving the above-mentioned pulse signal of the first comparator 2 output, and produces protection signal when above-mentioned pulse signal meets pre-conditioned, and this protection signal is for turning off the output loading being connected with light modulator 1.
Specifically, the first input end of the first comparator 2 is the in-phase end of the first comparator 2, and the second input of the first comparator 2 is the end of oppisite phase of the first comparator 2.The i.e. output of sampled voltage Acquisition Circuit 4 and the in-phase end of the first comparator 2 connects, and the output of the first reference voltage Acquisition Circuit 5 and the end of oppisite phase of the first comparator 2 connect.
During actually used, when the angle of light modulator 1 diminishes, the sine wave of input can cut away a part by modulated light device 1, the i.e. voltage signal of light modulator 1 output can change, gather the sampled voltage after diminishing due to light modulator 1 angle by sampled voltage Acquisition Circuit 4, meanwhile, gather a reference voltage by the first reference voltage Acquisition Circuit 5, by the first comparator 2, sampled voltage and reference voltage are compared, a pulse signal will be formed.The angle of light modulator 1 is the least; the dutycycle of pulse signal is the least; according to this rule; in conjunction with comparing formed pulse signal; protection signal generating circuit 3 just can detect the degree that the angle of light modulator diminishes, and when the angle of light modulator is varied down to a threshold value, protects the signal generating circuit 3 will output protection signal; to turn off output loading or the control circuit of output loading, thus reach to protect output loading and the effect of light modulator.
It should be noted that, the first reference voltage that first reference voltage Acquisition Circuit 5 collects not is fixing, and is as input voltage peak value and produces change, specifically, first reference voltage becomes preset ratio with the peak value of input voltage, and this preset ratio can be configured according to actual needs.So purpose of design is in order to when input voltage changes, the dutycycle of the pulse signal of the first comparator 2 output is not greatly changed.If the first reference voltage is fixed, then when input voltage changes, the dutycycle of pulse signal also can change, and also can be changed by the light modulator angle of protection signal generating circuit 3 detection, be unfavorable for protection.Will be designed as with input voltage peak change by the first reference voltage, be to eliminate due to input voltage change adverse effect produced by testing result.
In the present embodiment; the protection circuit of LED matrix produces the pulse signal corresponding with light modulator angle state by the first comparator; and by protection signal generating circuit, this pulse signal is detected; protection signal is produced when this pulse signal meets pre-conditioned; thus realizing turning off output loading when light modulator angle diminishes so that light modulator and output loading are effectively protected.
The structural representation of the protection circuit embodiment two of the LED matrix that Fig. 2 provides for the utility model, as in figure 2 it is shown, protection signal generating circuit 3 specifically includes: the second comparator the 31, second reference voltage Acquisition Circuit 32 and filter circuit 33.
Correspondingly, the output of aforementioned first comparator 2 is connected with the input of protection signal generating circuit 3, particularly as follows:
The output of the first comparator 2 is connected with the input of filter circuit 33, and the first input end of the second comparator 31 is connected with the output of filter circuit 33.
Second input of the second comparator 31 and the output of the second reference voltage Acquisition Circuit 32 connect.
The output of the second comparator 31 is used for exporting above-mentioned protection signal.
Specifically; the pulse signal exported by the first comparator 2 can produce corresponding voltage after circuit 33 filters after filtering; the second reference voltage that this voltage and the second reference voltage Acquisition Circuit 32 are gathered is compared; if the voltage that filtering produces is less than the second reference voltage; then explanation light modulator angle is varied down to certain degree; now, a protection signal will be exported by output.
Preferably, above-mentioned protection signal can be a low level signal.Certainly, protection signal can also be high level, can the most specifically arrange.But below all illustrate as a example by protection signal is as low level.
Seeing figures.1.and.2, this low level signal can export the control circuit of the control circuit of output loading or output loading, output loading or output loading and can automatically shut down under the triggering of this low level signal.
It should be noted that; the second reference voltage that above-mentioned second reference voltage Acquisition Circuit 32 is gathered is the magnitude of voltage corresponding with light modulator angle, the output protection signal when the second comparator 31 detects that the magnitude of voltage that aforementioned pulse signal is corresponding reaches corresponding magnitude of voltage.Specifically arranging of second reference voltage Acquisition Circuit 32 can be carried out the most flexibly, is not particularly limited herein.Second reference voltage can obtain according to practical experience value with the corresponding relation of light modulator angle.
The structural representation of the protection circuit embodiment three of the LED matrix that Fig. 3 provides for the utility model, as it is shown on figure 3, the another kind of structure of protection signal generating circuit 3 includes: single-chip microcomputer 34.
Correspondingly, the output of aforementioned first comparator 2 is connected with the input of protection signal generating circuit 3, particularly as follows:
The output of the first comparator 2 is connected with the input of single-chip microcomputer 34.
Single-chip microcomputer 34 is for the output of pulse signal above-mentioned protection signal according to the first comparator 2 output.
Specifically; after single-chip microcomputer 34 receives the pulse signal of the first comparator 2 output; the pulse width of this pulse signal is detected; if pulse width is less than a preset value; illustrate that light modulator angle is less, now can output protection signal, such as low level signal; subsequent process is consistent with aforementioned, and here is omitted.
Wherein, above-mentioned preset value and light modulator angle also have corresponding relation, output protection signal during to ensure that pulse signal reaches this preset value.
The structural representation of the protection circuit embodiment four of the LED matrix that Fig. 4 (a) provides for the utility model; the connection diagram of the protection circuit embodiment four of the LED matrix that Fig. 4 (b) provides for the utility model; with reference to Fig. 4 (a), Fig. 4 (b) and Fig. 1, the protection circuit of above-mentioned LED matrix also includes: rectifier bridge 6, circuit for power conversion 7；Correspondingly, first end of light modulator 1 is connected with the first input end of rectifier bridge 6, second end of light modulator 1 is connected with the second input of rectifier bridge 6, first output of rectifier bridge 6 is connected with the first input end of circuit for power conversion 7, and the second output of rectifier bridge 6 is connected with the second input of circuit for power conversion 7.
The input of sampled voltage Acquisition Circuit 4 is connected on the connecting line between the first end of light modulator 1 and the first input end of rectifier bridge 6, such as the A point in Fig. 4 (a)；Or,
The input of sampled voltage Acquisition Circuit 4 is connected on the connecting line between the second end of light modulator 1 and the second input of rectifier bridge 6, such as the B point in Fig. 4 (a)；Or,
The input of sampled voltage Acquisition Circuit 4 is connected on the connecting line between the first output of rectifier bridge 6 and the first input end of circuit for power conversion 7, such as the C point in Fig. 4 (a).
Above-mentioned A point and B point be after light modulator 1 before rectifier bridge 6 any place in input both threads a bit, above-mentioned C point be any place before rectifier bridge 6 circuit for power conversion 7 afterwards a bit.
Wherein, on which the point no matter input of sampled voltage Acquisition Circuit 4 is connected in A point, B point or C point, the sampled voltage collected is all the voltage after light modulator 1 cuts away.
Further referring to (1), (2) or (3) in Fig. 4 (b), sampled voltage Acquisition Circuit 4 includes: the first resistance R1 and the second resistance R2 connected with the first resistance R1.
First end of the first resistance R1 is as the input of sampled voltage Acquisition Circuit 4.
Second end of the first resistance R1 and the first end series connection of the second resistance R2, and the output of sampled voltage Acquisition Circuit 4 is on the connecting line between second end and first end of the second resistance R2 of the first resistance R1.
(1), (2) in Fig. 4 (b) is only that input is different with (3), and remaining internal structure is identical.
Specifically, as the sampled voltage of the first comparator 2 after sampled voltage Acquisition Circuit 4 passes through the first resistance R1 and the second resistance R2 dividing potential drop.
Further, sampled voltage Acquisition Circuit 4 can also use the structure as described in (4) in Fig. 4 (b), with reference to (4) in Fig. 4 (b), sampled voltage Acquisition Circuit 4 includes two diode L1 and L2, the first resistance R1 and the second resistance R2.Wherein, one end of two diode L1 and L2 is connected respectively on aforesaid A point and B point, input as sampled voltage Acquisition Circuit 4, the other end of two diode L1 and L2 is all connected to first end of the first resistance R1, second end of the first resistance R1 and the first end series connection of the second resistance R2, and the output of sampled voltage Acquisition Circuit 4 is on the connecting line between second end and first end of the second resistance R2 of the first resistance R1.
The structural representation of the protection circuit embodiment five of the LED matrix that Fig. 5 (a) provides for the utility model; the connection diagram of the protection circuit embodiment five of the LED matrix that Fig. 5 (b) provides for the utility model; with reference to Fig. 5 (a) and Fig. 5 (b); the input of the first reference voltage Acquisition Circuit 5 is connected on the connecting line between the first end of light modulator 1 and the first input end of rectifier bridge 6, such as the A point in Fig. 5 (a)；Or,
The input of the first reference voltage Acquisition Circuit 5 is connected on the connecting line between the second end of light modulator 1 and the second input of rectifier bridge 6, such as the B point in Fig. 5 (a)；Or,
The input of the first reference voltage Acquisition Circuit 5 is connected on the connecting line between the first output of rectifier bridge 6 and the first input end of circuit for power conversion 7, such as the C point in Fig. 5 (a).
Wherein, A point, B point and the C point in Fig. 5 (a) is identical with the implication of A point, B point and C point in above-mentioned Fig. 4 (a).
Further referring to (1), (2) or (3) in Fig. 5 (b), the first reference voltage Acquisition Circuit 5 includes: the first diode L3, the 3rd resistance R3, the 4th resistance R4 and the first electric capacity C1.
First end of the first diode L3 is as the input of the first reference voltage Acquisition Circuit 5.
First end of the 3rd resistance R3 and second end of the first diode L3 connect, first end of the 4th resistance R4 and the second end series connection of the 3rd resistance R3；
First electric capacity C1 is in parallel with the 3rd resistance R3 and the 4th resistance R4.
The output of the first reference voltage Acquisition Circuit 5 is on the connecting line between second end and first end of the 4th resistance R4 of the 3rd resistance R3.
(1), (2) in Fig. 5 (b) is only that input is different with (3), and remaining internal structure is identical.
Specifically, the first reference voltage Acquisition Circuit 5 can obtain the peak value of input voltage by the first diode L3 and the first electric capacity C1, then passes through after the 3rd resistance R3 and the 4th resistance R4 dividing potential drop the first reference voltage as the first comparator 2.
Further, first reference voltage Acquisition Circuit 5 can also use the structure as described in (4) in Fig. 5 (b), with reference to (4) in Fig. 5 (b), the first reference voltage Acquisition Circuit 5 includes the second diode L4 and the 3rd diode L5, the 3rd resistance R3, the 4th resistance R4 and the first electric capacity C1.Wherein, one end of the second diode L4 and the 3rd diode L5 is connected respectively on aforesaid A point and B point, as the input of the first reference voltage Acquisition Circuit 5.The output of the second diode L4 is simultaneously connected to the first end and first end of the 3rd resistance R3 of the first electric capacity C1.The output of the 3rd diode L5 is also simultaneously connected to the first end and first end of the 3rd resistance R3 of the first electric capacity C1.Second end of the 3rd resistance R3 and the first end series connection of the 4th resistance R4, the first electric capacity C1 and the 3rd resistance R3 and the 4th resistance R4 is in parallel.The output of the first reference voltage Acquisition Circuit 5 is on the connecting line between second end and first end of the 4th resistance R4 of the 3rd resistance R3.
The structural representation of the protection circuit embodiment six of the LED matrix that Fig. 6 (a) provides for the utility model; the connection diagram of the protection circuit embodiment six of the LED matrix that Fig. 6 (b) provides for the utility model; with reference to Fig. 6 (a), Fig. 6 (b) and Fig. 1, the protection circuit of above-mentioned LED matrix also includes: the first load 8 and the first load control circuit 9 connected with the first load 8.
Wherein, the first input end of the first load 8 is connected with the output of protection signal generating circuit 3.
Second input of the first load 8 is connected on the connecting line between the first end of light modulator 1 and the first input end of rectifier bridge 6, such as the A point in Fig. 6 (a)；Or,
Second input of the first load 8 is connected on the connecting line between the second end of light modulator 1 and the second input of rectifier bridge 6, such as the B point in Fig. 6 (a)；Or,
Second input of the first load 8 is connected on the connecting line between the first output of rectifier bridge 6 and the first input end of circuit for power conversion 7, such as the C point in Fig. 6 (a).
Output and first load control circuit 9 of the first load 8 connect.
First load 8, for when above-mentioned protection signal turns off the output loading being connected with light modulator 1, powering for light modulator 1.
Wherein, (1), (2) in Fig. 6 (b) is only that input is different with (3), and remaining internal structure is identical.
Preferably, the first load 8 is specifically as follows a resistance.
When the angle of light modulator 1 is less, protection signal generating circuit 3 meeting output protection signal is to turn off output loading or the control circuit of output loading, and having no progeny in pass, output loading loop does not the most have electric current and passes through so that light modulator also cannot work.For ensureing that closing, in output loading, light modulator of having no progeny can normally work, in the present embodiment, the protection circuit of above-mentioned LED matrix increases the first load 8; close when output loading and have no progeny; first load 8 meeting normal power supply, thus provide one to maintain electric current for light modulator 1, it is ensured that the normal work of light modulator 1.
Specifically, when after protection signal generating circuit 3 output protection signal, by making voltage be added in the first load 8 two ends with the first load control circuit 9 of the first load in series, provide to light modulator 1 and maintain electric current.
The schematic flow sheet of the guard method embodiment one of the LED matrix that Fig. 7 provides for the utility model; as shown in Figure 7; the method is applied in the protection circuit of aforesaid LED matrix, and the protection circuit of this LED matrix includes: the first comparator and protection signal generating circuit, and the method includes:
S101, the first comparator receive the sampled voltage that sampled voltage Acquisition Circuit gathers, and receive the first reference voltage that the first reference voltage Acquisition Circuit gathers.
S102, the first comparator compare process to above-mentioned sampled voltage and above-mentioned first reference voltage, obtain pulse signal.
Above-mentioned pulse signal is sent to protect signal generating circuit by S103, the first comparator.
S104, protection signal generating circuit receive the above-mentioned pulse signal of the first comparator output, and produce protection signal when above-mentioned pulse signal meets pre-conditioned.
The method be embodied as details, be referred to previous embodiment, here is omitted.
The schematic flow sheet of the guard method embodiment two of the LED matrix that Fig. 8 provides for the utility model; as shown in Figure 8; above-mentioned protection signal generating circuit includes: the second comparator, the second reference voltage Acquisition Circuit and filter circuit, and above-mentioned steps S104 specifically includes:
Above-mentioned pulse signal is filtered processing by S201, filter circuit, obtains voltage to be compared.
S202, the second comparator compare process to the second reference voltage of above-mentioned voltage to be compared and the second reference voltage Acquisition Circuit collection, obtain protection signal.
In another embodiment, above-mentioned protection signal generating circuit includes single-chip microcomputer.Correspondingly, above-mentioned steps S104 specifically includes: single-chip microcomputer judges whether the pulse width of above-mentioned pulse signal is less than preset value, and according to judged result output protection signal.
Last it is noted that various embodiments above is only in order to illustrate the technical solution of the utility model, it is not intended to limit；Although the utility model being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or the most some or all of technical characteristic is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of the utility model each embodiment technical scheme.
Claims (8)
1. a protection circuit for LED matrix, for connecting light modulator at LED device
Rear protection LED drive power or LED matrix, it is characterised in that including: the first comparator, protection
Signal generating circuit, sampled voltage Acquisition Circuit and the first reference voltage Acquisition Circuit；
The first input end of described first comparator is connected with the output of described sampled voltage Acquisition Circuit,
Second input of described first comparator is connected with the output of described first reference voltage Acquisition Circuit,
The output of described first comparator is connected with the input of described protection signal generating circuit；
Described first comparator, for the sampled voltage and described to the output of described sampled voltage Acquisition Circuit
First reference voltage of the first reference voltage Acquisition Circuit output compares, and exports according to comparative result
Pulse signal, wherein, the first reference voltage of described first reference voltage Acquisition Circuit output and described tune
The input voltage of light device becomes preset ratio；
Described protection signal generating circuit, for receiving the described pulse signal of described first comparator output,
And when described pulse signal meets pre-conditioned produce protection signal, described protection signal for turn off with
The output loading that described light modulator connects.
The protection circuit of LED matrix the most according to claim 1, it is characterised in that described guarantor
Protect signal generating circuit to include: the second comparator, the second reference voltage Acquisition Circuit and filter circuit；
Correspondingly, the output of described first comparator connects with the input of described protection signal generating circuit
Connect, particularly as follows:
The output of described first comparator is connected with the input of described filter circuit, and described second compares
The first input end of device is connected with the output of described filter circuit；
Second input of described second comparator connects with the output of described second reference voltage Acquisition Circuit
Connect；
The output of described second comparator is used for exporting described protection signal.
The protection circuit of LED matrix the most according to claim 1, it is characterised in that described guarantor
Protect signal generating circuit to include: single-chip microcomputer；
Correspondingly, the output of described first comparator connects with the input of described protection signal generating circuit
Connect, particularly as follows:
The output of described first comparator is connected with the input of described single-chip microcomputer；
Described single-chip microcomputer is for protecting described in the described output of pulse signal according to described first comparator output
Signal.
The protection circuit of LED matrix the most according to claim 1, it is characterised in that described electricity
Road also includes: rectifier bridge, circuit for power conversion；Wherein, the first end of described light modulator and described rectification
The first input end of bridge connects, and the second end of described light modulator is connected with the second input of described rectifier bridge,
First output of described rectifier bridge is connected with the first input end of described circuit for power conversion, described rectification
Second output of bridge is connected with the second input of described circuit for power conversion；
The input of described sampled voltage Acquisition Circuit is connected to the first end of described light modulator and described rectification
On connecting line between the first input end of bridge；Or,
The input of described sampled voltage Acquisition Circuit is connected to the second end of described light modulator and described rectification
On connecting line between second input of bridge；Or,
The input of described sampled voltage Acquisition Circuit is connected to the first output of described rectifier bridge with described
On connecting line between the first input end of circuit for power conversion.
The protection circuit of LED matrix the most according to claim 4, it is characterised in that described in adopt
Sample voltage collection circuit includes: the first resistance and the second resistance with described first resistant series；
First end of described first resistance is as the input of described sampled voltage Acquisition Circuit；
Second end of described first resistance is connected with the first end of described second resistance, and described sampled voltage
The output of Acquisition Circuit is between second end and the first end of described second resistance of described first resistance
Connecting line on.
The protection circuit of LED matrix the most according to claim 4, it is characterised in that described
The input of one reference voltage Acquisition Circuit is connected to the of the first end of described light modulator and described rectifier bridge
On connecting line between one input；Or,
The input of described first reference voltage Acquisition Circuit is connected to the second end of described light modulator with described
On connecting line between second input of rectifier bridge；Or,
The input of described first reference voltage Acquisition Circuit be connected to the first output of described rectifier bridge with
On connecting line between the first input end of described circuit for power conversion.
The protection circuit of LED matrix the most according to claim 6, it is characterised in that described
One reference voltage Acquisition Circuit includes: the first diode, the 3rd resistance, the 4th resistance and the first electric capacity；
First end of described first diode is as the input of described first reference voltage Acquisition Circuit；
First end of described 3rd resistance and the second end of described first diode connect, described 4th resistance
The first end and described 3rd resistance second end series connection；
Described first electric capacity is with described 3rd resistance and described 4th resistor coupled in parallel；
The output of described first reference voltage Acquisition Circuit is positioned at the second end of described 3rd resistance with described
On connecting line between first end of the 4th resistance.
The protection circuit of LED matrix the most according to claim 4, it is characterised in that described LED
The protection circuit of device also includes: the first load and the first load with described first load in series control
Circuit；
The first input end of described first load is connected with the output of described protection signal generating circuit；
Second input of described first load is connected to the first end of described light modulator and described rectifier bridge
On connecting line between first input end；Or,
Second input of described first load is connected to the second end of described light modulator and described rectifier bridge
On connecting line between second input；Or,
Second input of described first load is connected to the first output of described rectifier bridge and described power
On connecting line between the first input end of change-over circuit；
The output of described first load is connected with described first load control circuit；
Described first load, for turning off the output loading being connected with described light modulator at described protection signal
Time, for described dimmer powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521132692.1U CN205565687U (en) | 2015-12-30 | 2015-12-30 | Protection circuit of LED device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521132692.1U CN205565687U (en) | 2015-12-30 | 2015-12-30 | Protection circuit of LED device |
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|---|---|
| CN205565687U true CN205565687U (en) | 2016-09-07 |
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ID=56822976
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521132692.1U Active CN205565687U (en) | 2015-12-30 | 2015-12-30 | Protection circuit of LED device |
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| CN (1) | CN205565687U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633911A (en) * | 2015-12-30 | 2016-06-01 | 生迪智慧科技有限公司 | Protection circuit and method of LED device |
| CN106329965A (en) * | 2016-09-12 | 2017-01-11 | 生迪智慧科技有限公司 | Rectification circuit and dimming circuit |
-
2015
- 2015-12-30 CN CN201521132692.1U patent/CN205565687U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633911A (en) * | 2015-12-30 | 2016-06-01 | 生迪智慧科技有限公司 | Protection circuit and method of LED device |
| WO2017114114A1 (en) * | 2015-12-30 | 2017-07-06 | Sengled Co., Ltd. | Led device protection circuit and method thereof |
| CN105633911B (en) * | 2015-12-30 | 2018-06-26 | 生迪智慧科技有限公司 | The protection circuit and method of LED matrix |
| US10257908B2 (en) | 2015-12-30 | 2019-04-09 | Sengled Co., Ltd. | LED device protection circuit and method thereof |
| CN106329965A (en) * | 2016-09-12 | 2017-01-11 | 生迪智慧科技有限公司 | Rectification circuit and dimming circuit |
| CN106329965B (en) * | 2016-09-12 | 2019-05-21 | 生迪智慧科技有限公司 | Rectification circuit and light adjusting circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Protection circuit of LED device Effective date of registration: 20230227 Granted publication date: 20160907 Pledgee: Tongxiang Yunbei Investment Construction Co.,Ltd. Pledgor: SENGLED Co.,Ltd. Registration number: Y2023980033490 |