CN211671024U - Automatic light-operated LED drive circuit and drive power supply - Google Patents
Automatic light-operated LED drive circuit and drive power supply Download PDFInfo
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Abstract
The utility model discloses an automatic light-operated LED drive circuit is applied to drive power supply, including the input, respectively with threshold signal production circuit and comparative signal production circuit that the input is connected, respectively with threshold signal production circuit with comparative signal production circuit connection's control circuit, with the main control chip that control circuit connects and respectively with main control chip comparative signal production circuit connection's feedback circuit. The utility model discloses do not need extra light-operated chip, the less circuit component of adoption volume has realized that light-operated lighting lamp extinguishes on daytime or light when stronger, and the automatic light-operated process of lighting when night or light are more weak, and has increased a feedback signal, drive signal through gathering main control chip itself with feedback signal output to comparison signal production circuit or whether, can make the light-operated lighting lamp light and go out the interconversion process and can not appear the phenomenon that the lamp dodges and postpone, reliability and practicality have been improved.
Description
Technical Field
The utility model relates to a LED intelligence lighting control technical field especially relates to an automatic light-operated LED drive circuit and drive power supply.
Background
Along with the rapid development of intelligent illumination driven by environmental protection and energy conservation, the semiconductor intelligent automatic light-operated LED illuminating lamp shows powerful popularization and application in various fields and places.
In the rural life, the illumination street lamps in courtyards and streets are most frequently used, people who live know that the rural streets are narrow, the walking is inconvenient at night, if the illumination lamps on the streets are always in a bright state, national energy is inevitably wasted, and however, an intelligent illumination control system which can save national electric energy and bring convenience to the life of residents is very important and valuable.
The existing automatic light control circuit schemes have two types: referring to fig. 1, fig. 1 is a first light control circuit including a photosensor, an electronic switch IC, a relay, etc.; the alternating voltage is subjected to voltage reduction, rectification and filtering, a power supply is provided for the light control circuit, and the on and off of the electronic switch IC are controlled by changing the photoresistor, so that the lamp is controlled to be on or off.
Referring to fig. 2, the second light control circuit includes a light control trigger circuit, a thyristor, a time-base chip, and a power circuit; the high and low levels of the time base IC are controlled by changing the resistance value of the photosensitive trigger to enable the light emitting diode to emit light or not, so that the state of the thyristor is controlled to cut off and turn on the illuminating lamp.
Above two kinds of schemes have all used the circuit more complicated, some devices that the cost is higher, the first kind has used devices such as electronic switch, relays, the second kind has used light-operated trigger, time base chip, devices such as thyristor, electronic switch and time base chip that include in two kinds of schemes all need extra supply circuit to provide energy just can normally work, can produce energy consumption like this and stability not well handle the accuse, the design is more complicated some to this kind of circuit can influence automatic light control effect if receive external signal interference. In addition, the volume of the photo-relay and the electronic switch is large, which occupies space, is not beneficial to the layout of a Printed Circuit Board (PCB), and affects the overall space and the total cost of the power supply. However, the electronic switch chip used based on the first scheme has low withstand voltage, is easy to cause breakdown in some areas with unstable power grid, and has low reliability for the automatic light-operated illuminating lamp; compared with the first type, the second thyristor is connected in series in the circuit, and because the alternating current power supply is switched on and off, the overvoltage and overcurrent phenomena can occur when the thyristor is switched on or switched off, so that the thyristor is broken down, and the reliability is also influenced; in addition, the two light control circuits may have a phenomenon of lamp flashing or delay in the switching process of on/off of the lamp, which also affects the reliability of the light control circuits. Therefore, it is necessary to design an automatic light control circuit with high reliability, low cost, low power consumption, simple circuit, high sensitivity and stable performance.
In summary, the existing light control circuit has the following defects or problems:
1, light-operated chips (for example, a TWH875 electronic integrated switch and an NE555 time-base integrated circuit are required to be added, the chips can only work by a power supply circuit, and are not main control chips of an LED driving power supply) to generate energy consumption, the circuits are relatively complex, the cost is high, the size is large, the occupied space is not occupied, the miniaturization is not facilitated, the layout of a PCB is not facilitated, and the whole space and the cost of the power supply are influenced.
2, the control chip is susceptible to the interference of external signals (such as the fluctuation of the power grid voltage and the interference pulse signals of household appliances), which easily causes logic input errors, thereby causing the switching errors of the light control circuit, and the thyristors are connected in series in the circuit, because the on-off of the thyristors can generate overvoltage phenomena when the alternating current power supply is switched on and off, the transistors are broken down.
The 2 defects or problems reduce the reliability of the light-operated illuminating lamp, and increase the design difficulty of the automatic light-operated circuit and the cost and the volume of the light-operated power supply.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in that, to prior art's defect, provide a performance more stable, the volume is less, the reliability is higher, the circuit is simpler and easy, sensitivity is higher, the less automatic light-operated LED drive circuit of energy consumption.
The utility model provides a technical scheme that its technical problem adopted is:
an automatic light-operated LED drive circuit is applied to a drive power supply and comprises an input end, a threshold signal generation circuit and a comparison signal generation circuit which are respectively connected with the input end, a control circuit which is respectively connected with the threshold signal generation circuit and the comparison signal generation circuit, a main control chip which is connected with the control circuit, and a feedback circuit which is respectively connected with the main control chip and the comparison signal generation circuit; wherein,
the comparison signal generating circuit generates a comparison signal according to the collected voltage of the input end and the sensed light intensity and transmits the comparison signal to the control circuit;
the threshold signal generating circuit collects the voltage of the input end and generates a threshold signal;
the control circuit is connected or disconnected according to the comparison signal and an internal reference signal, and transmits the threshold signal to the main control chip to switch off the main control chip when the control circuit is connected, and the main control chip works when the control circuit is switched off;
the feedback circuit is switched on or switched off according to the collected driving signal of the main control chip, and outputs a feedback signal to the comparison signal generating circuit when the feedback circuit is switched on, so that the comparison signal is controlled to control the control circuit to be switched from on to off rapidly.
Further, the feedback circuit comprises a first diode D1, a thirteenth resistor R13 connected with the cathode of the first diode D1, a first MOS transistor Q1, a ninth resistor R9 connected with the drain of the first MOS transistor Q1, a second zener diode ZD2 and a twelfth resistor R12 connected in parallel; wherein,
the cathode of the second zener diode ZD2 is connected with the thirteenth resistor R13, the anode of the second zener diode ZD2 is grounded, the anode of the first diode D1 is connected with the driving signal pin of the main control chip, the gate of the first MOS transistor Q1 is connected with the cathode of the second zener diode ZD2, the source of the first MOS transistor Q1 is grounded, and the ninth resistor R9 is connected with the comparison signal generating circuit;
the thirteenth resistor R13 collects the driving signal through a driving signal pin of the main control chip, and forms a first control signal after voltage division of the twelfth resistor R12 and voltage stabilization of the second voltage stabilizing diode ZD2 to be input to a grid of the first MOS tube Q1, when the first control signal is at a high level, the first MOS tube Q1 is switched on, and the feedback signal is output through the ninth resistor R9 to control the comparison signal generation circuit, so that the comparison signal is controlled to be rapidly formed into a low level to control the control circuit to be rapidly switched from on to off.
Further, the control circuit comprises a first control circuit and a controllable voltage stabilizing circuit; wherein,
the first end of the first control circuit is connected with the threshold signal generating circuit, the second end of the first control circuit is connected with a current detection pin of the main control chip, the first end of the controllable voltage stabilizing circuit is connected with the comparison signal generating circuit, the second end of the controllable voltage stabilizing circuit is connected with the control end of the first control circuit, and the third end of the controllable voltage stabilizing circuit is grounded;
the controllable voltage stabilizing circuit compares the comparison signal with the internal reference signal to output a second control signal to the control end of the first control circuit, when the comparison signal is at a high level or a low level, the first control circuit is correspondingly switched on or switched off according to the low level or the high level of the second control signal, so that the threshold signal is transmitted to the main control chip to switch off the main control chip when the threshold signal is switched on, and when the first control circuit is switched off, the main control chip works.
Further, the controllable voltage stabilizing circuit comprises a first controllable precise voltage stabilizing source U1, a first capacitor C1 and a tenth resistor R10 which are connected in parallel; wherein
A first parallel node of the tenth resistor R10 and the first capacitor C1 is connected with the in-phase end of the first controllable precise voltage-stabilizing source U1, the cathode of the first controllable precise voltage-stabilizing source U1 is connected with the control end of the first control circuit, the anode of the first controllable precise voltage-stabilizing source U1 is connected with the second parallel node of the tenth resistor R10 and the first capacitor C1 and then grounded, and the in-phase end of the first controllable precise voltage-stabilizing source U1 is connected with the comparison signal generating circuit;
the first controllable precise voltage-stabilizing source U1 compares the comparison signal received by the non-inverting terminal with an internal reference signal and outputs the second control signal to the control terminal of the first control circuit, so that the first control circuit is turned on or off according to the low level or high level of the second control signal.
Further, the first control circuit comprises a second triode Q2, an eighth resistor R8, an eleventh resistor R11 and a fourteenth resistor R14; wherein,
the eleventh resistor R11 is connected in parallel between the emitter and the base of the second triode Q2 to form a third parallel node and a fourth parallel node, the third parallel node is connected with the first end of the fourteenth resistor R14, the collector of the second triode Q2 is connected with the current detection pin of the main control chip through the eighth resistor R8, the third parallel node is connected with the threshold signal generating circuit, and the second end of the fourteenth resistor R14 is connected with the second end of the controllable voltage stabilizing circuit;
the second transistor Q2 is turned on or off according to the low level or the high level of the second control signal, so that the threshold signal is controlled to be transmitted to the current detection pin of the main control chip when the second transistor Q2 is turned on, the current detection pin of the main control chip is turned off by obtaining the high level threshold signal, and the main control chip operates when the second transistor Q2 is turned off.
Further, the driving circuit further comprises a filter rectification circuit, wherein the filter rectification circuit comprises a rectification bridge BD1, a third filter capacitor C3 connected to the second end and the third end of the rectification bridge BD1, and a second filter capacitor C2 connected to the first end and the second end of the rectification bridge BD 1; wherein,
alternating current voltage is connected to two ends of the third filter capacitor C3, the rectifier bridge BD1 rectifies the alternating current voltage, a second end of the second filter capacitor C2 is grounded, and a first end of the second filter capacitor C2 is the input end.
Further, the threshold signal generating circuit includes a first zener diode ZD1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7; wherein,
one path of the input end is connected with the cathode of the first voltage-stabilizing diode ZD1 through the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, the anode of the first voltage-stabilizing diode ZD1 is grounded, and the node of the seventh resistor R7, which is connected with the cathode of the first voltage-stabilizing diode ZD1, is connected with the emitter of the second triode Q2;
the voltage of the input end generates a set threshold signal after being collected by the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 and stabilized by the first voltage stabilizing diode ZD1, the threshold signal is at a high level, and the threshold signal is transmitted or blocked to the current detection pin of the main control chip through the second triode Q2 according to the on or off of the second triode Q2.
Further, the comparison signal generating circuit comprises a photosensitive diode GR1-A, a fourth resistor R4, a first resistor R1, a second resistor R2 and a third resistor R3; wherein,
one path of the input end is connected with the cathode of the photosensitive diode GR1-A through the first resistor R1, the second resistor R2 and the third resistor R3, the anode of the photosensitive diode GR1-A is grounded through the fourth resistor R4, one path of a node, connected with the anode of the photosensitive diode GR1-A, of the fourth resistor R4 is connected with the in-phase end of the first controllable precise voltage-stabilizing source U1, and the other path of the node is connected with the drain of the first MOS transistor Q1 through the ninth resistor R9;
when the light is strong or weak, the photodiode GR1-a makes the comparison signal input from the non-inverting terminal of the first controllable precision voltage regulator U1 be at a high level or a low level, so as to control the first controllable precision voltage regulator U1 to be turned on or off, and output the low level or the high level to the base of the second triode Q2, so as to turn on or off the second triode Q2.
Preferably, the model of the main control chip is MT7990, and the model of the first controllable precision voltage regulator source U1 is TL 431.
The utility model also provides a drive power supply, drive power supply includes above automatic light-operated LED drive circuit.
Implement the utility model discloses an automatic light-operated LED drive circuit has following beneficial effect: the utility model discloses an automatic light-operated LED drive circuit accessible light automatic adjustment main control chip's work is whether, it is small to have, the reliability is high, and is with low costs, stability is good etc. characteristics, provide feedback signal through setting up feedback circuit, can make comparison signal control circuit be turn-offs by switching on fast, and control circuit is connected with main control chip, thereby can realize controlling main control chip normal work through control circuit, avoid appearing comparison signal because the unstable phenomenon of the work unstability of the control circuit who leads to and main control chip, the reliability is improved, the practicality is good, and this drive circuit can effectively control the bright conversion of going out of light-operated light in being applied to drive power supply steadily, and the phenomenon that the lamp dodges and postpones can not appear in the conversion process, the reliability is higher, the practicality is good.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic view of a first prior art light control arrangement;
fig. 2 is a schematic view of a second prior art light management structure;
fig. 3 is a schematic structural diagram of an embodiment of an automatic light-operated LED driving circuit provided in the present invention;
fig. 4 is a schematic circuit diagram of an embodiment of an automatic light-operated LED driving circuit provided by the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 3, fig. 3 is a schematic diagram of an embodiment of an automatic light-operated LED driving circuit, which can be applied to a driving power supply, including an input terminal, specifically, the driving circuit further includes a threshold signal generating circuit 20 and a comparison signal generating circuit 30 respectively connected to the input terminal, a control circuit 40 respectively connected to the threshold signal generating circuit 20 and the comparison signal generating circuit 30, a main control chip 50 connected to the control circuit 40, and a feedback circuit 60 respectively connected to the main control chip 50 and the comparison signal generating circuit 30.
Specifically, in the present embodiment,
the comparison signal generating circuit 30 generates a comparison signal according to the collected voltage at the input end and the sensed light intensity, and transmits the comparison signal to the control circuit 40, wherein the voltage at the input end is generated after rectification and filtering, the alternating current voltage input to the automatic light-operated LED driving circuit may be 220V, and it should be noted that the comparison signal represents a high level in the daytime or when the light is strong, and the comparison signal represents a low level in the nighttime or when the light is weak;
the threshold signal generating circuit 20 collects the voltage at the input terminal and generates a threshold signal, which is a set high level and is set by a specific hardware circuit (such as a resistor);
the control circuit 40 compares the comparison signal with an internal reference signal to turn on or off, and transmits a threshold signal to the main control chip 50 to turn off the main control chip 50 when the control circuit 40 is turned off, and when the control circuit 40 is turned off, the main control chip 50 works, it can be understood that when the main control chip 50 is in a turn-off protection state, the light-operated illuminating lamp is in a turn-off state, and when the main control chip 50 works, the light-operated illuminating lamp is in a turn-on state;
the feedback circuit 60 is turned on or off according to the collected driving signal of the main control chip 50, and outputs a feedback signal to the comparison signal generating circuit 30 when turned on, thereby controlling the comparison signal to control the control circuit 40 to be rapidly switched from on to off.
It should be noted that, because the change of the light intensity will affect the magnitude of the comparison signal, in the process of changing the light from strong to weak or in the process of changing the light from daytime to night, the level of the comparison signal will also have a slowly changing process, so that the comparison signal input to the control circuit is unstable, thereby causing the working state of the control circuit to be unstable, causing the threshold signal obtained by the main control chip to be unstable, and the working state of the main control chip to be unstable, causing the phenomenon of lamp flashing or delayed lighting, and after the feedback signal generating circuit is added, the feedback signal can be added into the comparison signal generating circuit at this time, so that the level of the comparison signal is rapidly changed, thereby ensuring that the control circuit can be switched on and off rapidly by breaking away from the unstable working state when the light changes from strong to weak in the alternate daytime and night, therefore, the light-operated illuminating lamp can be quickly switched from extinguishing to lighting, the phenomenon of lamp flashing or delay is solved, and the reliability and the practicability of the circuit are effectively improved. It can be understood that when light is converted into by less strong, or when becoming the day night, the comparison signal just does not receive feedback signal's influence, makes control circuit can break away from unstable operating condition and switch on by turn-off fast to make light-operated lighting lamp by lighting to extinguish can the fast switch-over, solve the phenomenon that the lamp dodges or postpones, also can effectively improve reliability and practicality.
As shown in fig. 4, fig. 4 is a schematic circuit diagram of an embodiment of an automatic light-controlled LED driving circuit provided by the present invention, in the specific embodiment shown in fig. 4, the model of the main control chip is MT7990, wherein the feedback circuit 60 includes a first diode D1, a thirteenth resistor R13 connected to the cathode of the first diode D1, a first MOS transistor Q1, a ninth resistor R9 connected to the drain of the first MOS transistor Q1, a second zener diode ZD2 and a twelfth resistor R12 connected in parallel; the first MOS transistor Q1 is an N-channel field effect transistor;
specifically, the cathode of the second zener diode ZD2 is connected to the thirteenth resistor R13, the anode of the second zener diode ZD2 is grounded, the anode of the first diode D1 is connected to the driving signal pin of the main control chip 50, the gate of the first MOS transistor Q1 is connected to the cathode of the second zener diode ZD2, the source of the first MOS transistor Q1 is grounded, and the ninth resistor R9 is connected to the comparison signal generating circuit 30;
in this specific embodiment, the implementation process of the feedback circuit controlling the comparison signal to quickly form the low level includes: the thirteenth resistor R13 collects a driving signal through a driving signal pin of the main control chip 50, and forms a first control signal after voltage division by the twelfth resistor R12 and voltage stabilization by the second zener diode ZD2 to be input to the gate of the first MOS transistor Q1, when the driving signal pin is at a high level, the first control signal is at a high level, the first MOS transistor Q1 is turned on, and outputs a feedback signal through the ninth resistor R9 to control the comparison signal generation circuit 30, so as to control the comparison signal to quickly form a low level to control the control circuit 40 to be switched from on to off quickly, so that the control circuit is separated from an unstable state, correspondingly, when the first control signal is at a low level, the first MOS transistor Q1 is turned off, at this time, the feedback signal cannot be output to the comparison signal generation circuit through the ninth resistor R9, so that the comparison signal is not affected by the feedback signal and is quickly increased to a high level, so as to control the control circuit 40 to be switched from off to on quickly, the control circuit is taken out of an unstable state.
In this embodiment, the feedback circuit provides the feedback signal to the comparison signal generating circuit through the driving signal of the main control chip itself, so that the on/off instantaneous switching of the light-operated lamp can be realized through the control circuit, and the working state of the control circuit is stably switched, so that the phenomenon of lamp flashing or delay cannot occur in the switching process of the light-operated lamp, and the reliability and the practicability of the automatic light-operated LED driving circuit are effectively improved.
Preferably, as shown in FIG. 3, the control circuit 40 includes a first control circuit 401 and a controllable voltage regulation circuit 402; wherein,
a first end of the first control circuit 401 is connected with the threshold signal generating circuit 20, a second end of the first control circuit 401 is connected with a current detection pin of the main control chip 50, a first end of the controllable voltage stabilizing circuit 402 is connected with the comparison signal generating circuit 30, a second end of the controllable voltage stabilizing circuit 402 is connected with a control end of the first control circuit 401, and a third end of the controllable voltage stabilizing circuit 402 is grounded;
the working principle of the controllable voltage stabilizing circuit 402 and the first control circuit 401 is as follows: the controllable voltage stabilizing circuit 402 compares the comparison signal with an internal reference signal to output a second control signal to the control terminal of the first control circuit 401, when the comparison signal is at a high level, the controllable voltage stabilizing circuit 402 is turned on to pull down the second control signal at the control terminal of the first control circuit 401 to a low level, the first control circuit 401 is correspondingly turned on according to the low level of the second control signal, so as to transmit a threshold signal to the main control chip 50 to turn off the main control chip 50 when the comparison signal is at the high level, conversely, when the comparison signal is at the low level, the controllable voltage stabilizing circuit 402 is turned off to further enable the second control signal at the control terminal of the first control circuit 401 to form a high level, which results in the first control circuit 401 being turned off, and when the first control circuit 401 is turned off, the main control chip 50 operates.
In this embodiment, the high level or the low level of the comparison signal controls the controllable voltage stabilizing circuit to be turned on or off, so as to control the first control circuit to be turned on or off, and therefore, the threshold signal can be transmitted to the main control chip or not, so as to control the main control chip to be turned off or normally work, and further achieve the purpose of automatic light control.
Further, as shown in FIG. 4, in one specific embodiment, the controllable voltage regulator circuit 402 may include a first controllable precision voltage regulator U1, a first capacitor C1 and a tenth resistor R10 connected in parallel; the first controllable precise voltage stabilizing source U1 is TL431 in model, and has fast dynamic response speed, low output noise, small size, low cost, raised PCB space utilization rate and raised precision and stability of the light-operated driving circuit.
Specifically, a first parallel node of a tenth resistor R10 and a first capacitor C1 is connected with the in-phase end of a first controllable precise voltage-stabilizing source U1, the cathode of the first controllable precise voltage-stabilizing source U1 is connected with the control end of a first control circuit 401, the anode of the first controllable precise voltage-stabilizing source U1 is connected with a second parallel node of a tenth resistor R10 and a first capacitor C1 and then grounded, and the in-phase end of the first controllable precise voltage-stabilizing source U1 is connected with a comparison signal generating circuit 30; wherein, the in-phase end can also be called as the reference end of the first controllable precise voltage stabilizing source U1.
The specific process of the first controllable precise voltage-stabilizing source U1 outputting the second control signal according to the comparison signal is as follows: the first controllable precise voltage regulator U1 compares the comparison signal received by the non-inverting terminal with the internal reference signal and outputs a second control signal to the control terminal of the first control circuit 401, so that the first control circuit 401 is turned on or off according to the low level or high level of the second control signal. When the comparison signal is at a high level, the first controllable precise voltage-stabilizing source U1 is turned on, so that the second control signal is output at a low level through grounding the anode, and conversely, when the comparison signal is at a high level, the first controllable precise voltage-stabilizing source U1 is turned off, and the second control signal is output at a low level.
In the embodiment, the first controllable precise voltage regulator U1 can realize precise adjustment on the output second control signal, thereby providing the precision and stable reliability of the automatic light control circuit.
Further, as shown in fig. 4, in a specific embodiment, the first control circuit 401 includes a second transistor Q2, an eighth resistor R8, an eleventh resistor R11, and a fourteenth resistor R14; the second triode Q2 is a PNP triode;
an eleventh resistor R11 is connected in parallel between an emitter and a base of the second triode Q2 to form a third parallel node and a fourth parallel node, the third parallel node is connected with a first end of a fourteenth resistor R14, a collector of the second triode Q2 is connected with a current detection pin of the main control chip 50 through an eighth resistor R8, the third parallel node is connected with the threshold signal generating circuit 20, and a second end of the fourteenth resistor R14 is connected with a second end of the controllable voltage stabilizing circuit 402;
the specific principle that the second triode Q2 controls whether the threshold signal generated by the threshold signal generating circuit is transmitted to the current detection pin of the main control chip to control the main control chip to turn off or work is as follows: the second transistor Q2 is turned on or off according to a low level or a high level of the second control signal, so that when the second transistor Q2 is turned on, the threshold signal is controlled to be transmitted to the current detection pin of the main control chip 50, the current detection pin of the main control chip 50 is turned off by obtaining the high level threshold signal, and when the second transistor Q2 is turned off, the main control chip 50 operates.
In this embodiment, the base of the second triode is the control end of the first control circuit, the control end is controlled by the cathode output end of the first controllable precise voltage-stabilizing source U1, when the light is stronger and changed into weaker light, or the daytime and night alternate, the comparison signal is changed from high level to low level, so that the second control signal is changed from low level to high level, the second triode is switched from on to off, the transmission of the blocking threshold signal to the current detection pin of the main control chip is realized, the main control chip is switched from off state to normal working state, and the purpose of turning on the lamp when the light is weaker or at night is achieved.
Further, in a specific embodiment, as shown in fig. 4, the driving circuit further includes a filter rectification circuit 10, the filter rectification circuit 10 includes a rectifier bridge BD1, a third filter capacitor C3 connected to the second terminal and the third terminal of the rectifier bridge BD1, and a second filter capacitor C2 connected to the first terminal and the second terminal of the rectifier bridge BD 1; wherein,
alternating voltage is connected to two ends of the third filter capacitor C3, the rectifier bridge BD1 rectifies an alternating current power supply, a second end of the second filter capacitor C2 is grounded, and a first end of the second filter capacitor C2 is an input end.
In this embodiment, the ac voltage 220V is filtered by the capacitor and rectified by the rectifier bridge, and then supplies power to the automatic light-controlled LED driving circuit through the first end, i.e., the input end, of the second filter capacitor, and meanwhile participates in signal adjustment of the automatic light-controlled circuit as part of generation of the comparison signal and the threshold signal.
Further, in an embodiment, as shown in fig. 4, the threshold signal generating circuit 20 includes a first zener diode ZD1, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7; wherein,
one path of the input end is connected with the cathode of a first voltage-stabilizing diode ZD1 through a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, the anode of the first voltage-stabilizing diode ZD1 is grounded, and the node of the seventh resistor R7, which is connected with the cathode of the first voltage-stabilizing diode ZD1, is connected with the emitter of a second triode Q2;
the voltage of the input end generates a set threshold signal after being collected by the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 and regulated by the first voltage-regulating diode ZD1, the threshold signal is at a high level, and the threshold signal is transmitted or blocked to the current detection pin of the main control chip 50 through the second triode Q2 according to the on or off of the second triode Q2.
In this embodiment, since the voltage rectified by the bridge rectifier bridge becomes large and the withstand voltage of one resistor is limited, it is preferable to use three resistors, and the first zener diode ZD1 functions as a voltage stabilizing protection circuit.
Further, in this embodiment, as shown in fig. 4, the comparison signal generating circuit 30 includes a photodiode GR1-a, a fourth resistor R4, a first resistor R1, a second resistor R2, and a third resistor R3; wherein,
one path of an input end is connected with a cathode of a photosensitive diode GR1-A through a first resistor R1, a second resistor R2 and a third resistor R3, an anode of the photosensitive diode GR1-A is grounded through a fourth resistor R4, one path of a node connected with the anode of the photosensitive diode GR1-A through a fourth resistor R4 is connected with the same-phase end of a first controllable precise voltage-stabilizing source U1, and the other path of the node is connected with a drain electrode of a first MOS transistor Q1 through a ninth resistor R9;
when the light is strong or weak, the photodiode GR1-a makes the comparison signal input from the non-inverting terminal of the first controllable precision voltage regulator U1 be at a high level or a low level, thereby controlling the first controllable precision voltage regulator U1 to be turned on or off, and outputting the low level or the high level to the base of the second triode Q2, so that the second triode Q2 is turned on or off.
In this embodiment, the resistance of the photodiode GR1-a is low and low, and the reverse current formed is large in the daytime or when the light is strong, so that the comparison signal input to the first controllable voltage regulator U1 after being divided by the fourth resistor R4 is at a high level, and conversely, when the light is weak at night or when the light is strong, the resistance of the photodiode GR1-a is high and high, so that the comparison signal input to the first controllable voltage regulator U1 after being divided by the fourth resistor R4 is at a low level, thereby achieving the purpose of automatic light control.
To further illustrate the reliability of the driving circuit, in a specific embodiment, as shown in fig. 4, the principle that the ninth resistor R9 of the feedback circuit outputs the feedback signal to control the comparison signal to quickly form a low level so as to control the control circuit 40 to quickly switch from on to off is as follows: when the day and the night alternate or the light is changed from strong to weak, the on-off switching of the first controllable precise voltage-stabilizing source U1 of the control circuit 40 has a transition period, so that the rapid switching cannot be ensured and the lamp flash hysteresis phenomenon occurs; at this time, the feedback circuit receives the high level of the driving signal pin of the main control chip, so that the first MOS transistor Q1 is turned on, the ninth resistor R9 is connected into the fourth resistor R4 in the comparison signal generating circuit 30 in parallel, so as to pull the comparison signal to a lower potential on the basis of the original potential of the comparison signal at the same phase end of the first controllable precise voltage-stabilizing source U1 in the control circuit 40, therefore, in the process of alternating between day and night or changing the light from strong to weak, the first controllable precise voltage-stabilizing source U1 which is originally unstable in working state is rapidly switched from on to off, so that the second control signal is rapidly switched from low level to high level, and further the current detecting pin of the main control chip is separated from the state of the threshold signal sometimes, so that the threshold signal cannot be detected within a period of time, thereby realizing the rapid switching of the main control chip from unstable working to stable working, the problem of lamp flashing delay in the transition period of switching on and switching off the first controllable precise voltage-stabilizing source is avoided, and the stability, reliability and practicability of the automatic light-operated LED driving circuit are effectively improved. It can be understood that, correspondingly, when the night and the day are alternated, or the light is weaker and turns to stronger, the driving signal of the pin for receiving the driving signal of the main control chip of the feedback circuit is low level, so that the first MOS transistor Q1 is turned off, the ninth resistor R9 cannot be connected to the fourth resistor R4 in the comparison signal generating circuit 30, and therefore cannot be connected in parallel with the same, at this time, the comparison signal is pulled to a higher potential based on the original potential of the comparison signal input to the same-phase end of the first controllable precise voltage-stabilizing source U1 in the control circuit 40, so that the first controllable precise voltage-stabilizing source U1, which is originally unstable in working state, is rapidly switched from off to on, so that the second control signal is rapidly switched from high level to low level, and further the current detection pin of the main control chip is separated from the threshold signal at times, thereby stably detecting the threshold signal, the fast switching of the main control chip from unstable work to stable turn-off is realized, the problem of lamp flashing delay in the turn-off and turn-on transition period of the first controllable precise voltage stabilizing source is avoided, and the stability, reliability and practicability of the automatic light-operated LED driving circuit are effectively improved.
In the automatic light-operated LED driving circuit provided by the utility model, because no extra light-operated chip which is easily interfered by external signals is used, the excessive energy consumption is avoided, the stability is better, the circuit is relatively simple, the cost is lower, the PCB layout is facilitated, and the integral space utilization rate and the reliability are improved; moreover, a feedback signal is added, and the feedback signal is provided for the light control unit (the comparison signal generating circuit and the control circuit) through the driving of the main control chip, so that the control circuit can be separated from the unstable working state to realize the instantaneous switching of the on and off of the light-operated illuminating lamp, the phenomenon of lamp flashing or delay can not occur in the switching process, and the reliability and the practicability of the automatic light-operated LED driving circuit are effectively improved.
The utility model also provides a drive power supply, this drive power supply include above automatic light-operated LED drive circuit.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. An automatic light-operated LED drive circuit is applied to a drive power supply and comprises an input end, and is characterized by further comprising a threshold signal generation circuit (20) and a comparison signal generation circuit (30) which are respectively connected with the input end, a control circuit (40) which is respectively connected with the threshold signal generation circuit (20) and the comparison signal generation circuit (30), a main control chip (50) which is connected with the control circuit (40), and a feedback circuit (60) which is respectively connected with the main control chip (50) and the comparison signal generation circuit (30); wherein,
the comparison signal generating circuit (30) generates a comparison signal according to the collected voltage of the input end and the sensed light intensity and transmits the comparison signal to the control circuit (40);
the threshold signal generating circuit (20) collects the voltage of the input end and generates a threshold signal;
the control circuit (40) is compared with an internal reference signal according to the comparison signal to be switched on or switched off, and transmits the threshold signal to the main control chip (50) to switch off the main control chip (50) when the control circuit (40) is switched off, and the main control chip (50) works when the control circuit (40) is switched off;
the feedback circuit (60) is switched on or off according to the collected driving signal of the main control chip (50), and outputs a feedback signal to the comparison signal generating circuit (30) when the feedback circuit is switched on, so that the comparison signal is controlled to control the control circuit (40) to be switched from on to off rapidly.
2. The automatic light-controlled LED driving circuit according to claim 1, wherein the feedback circuit (60) comprises a first diode D1, a thirteenth resistor R13 connected to the cathode of the first diode D1, a first MOS transistor Q1, a ninth resistor R9 connected to the drain of the first MOS transistor Q1, a second zener diode ZD2 and a twelfth resistor R12 connected in parallel; wherein,
the cathode of the second zener diode ZD2 is connected with the thirteenth resistor R13, the anode of the second zener diode ZD2 is grounded, the anode of the first diode D1 is connected with the driving signal pin of the main control chip (50), the gate of the first MOS transistor Q1 is connected with the cathode of the second zener diode ZD2, the source of the first MOS transistor Q1 is grounded, and the ninth resistor R9 is connected with the comparison signal generation circuit (30);
the thirteenth resistor R13 collects the driving signal through a driving signal pin of the main control chip (50), and forms a first control signal after voltage division of the twelfth resistor R12 and voltage stabilization of the second zener diode ZD2 to be input to a grid of the first MOS tube Q1, when the first control signal is at a high level, the first MOS tube Q1 is turned on, and outputs the feedback signal through the ninth resistor R9 to control the comparison signal generation circuit (30), so that the comparison signal is controlled to be at a low level quickly to control the control circuit (40) to be switched from on to off quickly.
3. An automatic light-controlled LED driver circuit according to any one of claims 1-2, characterized in that the control circuit (40) comprises a first control circuit (401) and a controllable voltage regulation circuit (402); wherein,
the first end of the first control circuit (401) is connected with the threshold signal generating circuit (20), the second end of the first control circuit (401) is connected with a current detection pin of the main control chip (50), the first end of the controllable voltage stabilizing circuit (402) is connected with the comparison signal generating circuit (30), the second end of the controllable voltage stabilizing circuit (402) is connected with the control end of the first control circuit (401), and the third end of the controllable voltage stabilizing circuit (402) is grounded;
the controllable voltage stabilizing circuit (402) compares the comparison signal with the internal reference signal to output a second control signal to the control end of the first control circuit (401), when the comparison signal is at a high level or a low level, the first control circuit (401) is correspondingly switched on or off according to the low level or the high level of the second control signal, so that the threshold signal is transmitted to the main control chip (50) to switch off the main control chip (50) when the threshold signal is switched on, and when the first control circuit (401) is switched off, the main control chip (50) works.
4. The automatic light-controlled LED driving circuit according to claim 3, wherein the controllable voltage regulator circuit (402) comprises a first controllable precision voltage regulator source U1, a first capacitor C1 and a tenth resistor R10 connected in parallel; wherein
A first parallel node of the tenth resistor R10 and the first capacitor C1 is connected with the in-phase end of the first controllable precise voltage-stabilizing source U1, the cathode of the first controllable precise voltage-stabilizing source U1 is connected with the control end of the first control circuit (401), the anode of the first controllable precise voltage-stabilizing source U1 is connected with the second parallel node of the tenth resistor R10 and the first capacitor C1 and then grounded, and the in-phase end of the first controllable precise voltage-stabilizing source U1 is connected with the comparison signal generating circuit (30);
the first controllable precise voltage stabilizing source U1 compares the comparison signal received by the in-phase terminal with an internal reference signal and outputs the second control signal to the control terminal of the first control circuit (401), so that the first control circuit (401) is correspondingly switched on or switched off according to the low level or the high level of the second control signal.
5. The automatic light-controlled LED driving circuit according to claim 4, wherein the first control circuit (401) comprises a second transistor Q2, an eighth resistor R8, an eleventh resistor R11, a fourteenth resistor R14; wherein,
the eleventh resistor R11 is connected between the emitter and the base of the second triode Q2 in parallel to form a third parallel node and a fourth parallel node, the third parallel node is connected with the first end of the fourteenth resistor R14, the collector of the second triode Q2 is connected with the current detection pin of the main control chip (50) through the eighth resistor R8, the third parallel node is connected with the threshold signal generating circuit (20), and the second end of the fourteenth resistor R14 is connected with the second end of the controllable voltage stabilizing circuit (402);
the second transistor Q2 is turned on or off according to a low level or a high level of the second control signal, so as to control the transmission of the threshold signal to the current detection pin of the main control chip (50) when turned on, the current detection pin of the main control chip (50) is turned off by the high level of the threshold signal, and the main control chip (50) operates when the second transistor Q2 is turned off.
6. The automatic light-controlled LED driving circuit according to claim 5, further comprising a filter rectification circuit (10), wherein the filter rectification circuit (10) comprises a rectifier bridge BD1, a third filter capacitor C3 connected to the second terminal and the third terminal of the rectifier bridge BD1, and a second filter capacitor C2 connected to the first terminal and the second terminal of the rectifier bridge BD 1; wherein,
alternating current voltage is connected to two ends of the third filter capacitor C3, the rectifier bridge BD1 rectifies the alternating current voltage, a second end of the second filter capacitor C2 is grounded, and a first end of the second filter capacitor C2 is the input end.
7. The automatic light-controlled LED driving circuit according to claim 6, characterized in that the threshold signal generating circuit (20) comprises a first zener diode ZD1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7; wherein,
one path of the input end is connected with the cathode of the first voltage-stabilizing diode ZD1 through the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, the anode of the first voltage-stabilizing diode ZD1 is grounded, and the node of the seventh resistor R7, which is connected with the cathode of the first voltage-stabilizing diode ZD1, is connected with the emitter of the second triode Q2;
the voltage of the input end generates a set threshold signal after being collected by the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 and regulated by the first voltage-regulating diode ZD1, the threshold signal is at a high level, and the threshold signal is transmitted or blocked to a current detection pin of the main control chip (50) through the second triode Q2 according to the on or off of the second triode Q2.
8. The automatic light-controlled LED driving circuit according to claim 7, wherein the comparison signal generating circuit (30) comprises a photodiode GR1-A, a fourth resistor R4, a first resistor R1, a second resistor R2, a third resistor R3; wherein,
one path of the input end is connected with the cathode of the photosensitive diode GR1-A through the first resistor R1, the second resistor R2 and the third resistor R3, the anode of the photosensitive diode GR1-A is grounded through the fourth resistor R4, one path of a node, connected with the anode of the photosensitive diode GR1-A, of the fourth resistor R4 is connected with the in-phase end of the first controllable precise voltage-stabilizing source U1, and the other path of the node is connected with the drain of the first MOS transistor Q1 through the ninth resistor R9;
when the light is strong or weak, the photodiode GR1-a makes the comparison signal input from the non-inverting terminal of the first controllable precision voltage regulator U1 be at a high level or a low level, so as to control the first controllable precision voltage regulator U1 to be turned on or off, and output the low level or the high level to the base of the second triode Q2, so as to turn on or off the second triode Q2.
9. The automatic light-controlled LED driving circuit according to claim 8, wherein the model of the main control chip (50) is MT7990, and the model of the first controllable precision voltage regulator source U1 is TL 431.
10. A driving power supply comprising an automatic light-controlled LED driving circuit according to any one of claims 1 to 9.
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| CN117460123A (en) * | 2023-12-26 | 2024-01-26 | 深圳莱福德科技股份有限公司 | Method for preventing no-load runaway of LED driving power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117460123A (en) * | 2023-12-26 | 2024-01-26 | 深圳莱福德科技股份有限公司 | Method for preventing no-load runaway of LED driving power supply |
| CN117460123B (en) * | 2023-12-26 | 2024-03-15 | 深圳莱福德科技股份有限公司 | Method for preventing no-load runaway of LED driving power supply |
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