CN108650732A - A kind of linear constant current LED circuit with light-sensing function - Google Patents
A kind of linear constant current LED circuit with light-sensing function Download PDFInfo
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- CN108650732A CN108650732A CN201810412756.5A CN201810412756A CN108650732A CN 108650732 A CN108650732 A CN 108650732A CN 201810412756 A CN201810412756 A CN 201810412756A CN 108650732 A CN108650732 A CN 108650732A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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Abstract
The invention discloses a kind of linear constant current LED circuit with light-sensing function, including LED illuminating circuits, AC to DC converter circuit, linear constant current circuit, photoinduction circuit, Parallel Voltage Regulator Circuit circuit, state retaining circuit, voltage smoothing circuit and resistor voltage divider circuit, the input terminal of voltage smoothing circuit is connected with the input terminal of resistor voltage divider circuit, the output end of voltage smoothing circuit, the positive input terminal of LED illuminating circuits is connected with the input terminal of Parallel Voltage Regulator Circuit circuit, the output end of Parallel Voltage Regulator Circuit circuit, the input terminal of linear constant current circuit is connected with the input terminal of photoinduction circuit, the output end of photoinduction circuit is connected with the input terminal of state retaining circuit, the output end of state retaining circuit and the second control terminal of linear constant current circuit connect, the output end of resistor voltage divider circuit is connected with the first control terminal of linear constant current circuit；Advantage is on the basis of ensureing high performance, and cost is relatively low, has higher cost performance, use easy to spread.
Description
Technical field
The present invention relates to a kind of linear constant current LED circuits, more particularly, to a kind of linear constant current LED with light-sensing function
Circuit.
Background technology
With being widely used for linear constant current LED circuit, market also proposes its function other highers other than illumination
Requirement, the linear constant current LED circuit with light-sensing function comes into being.LED circuit with light-sensing function detects institute in real time
Locate illuminance size in environment, when the illuminance detected is less than the reference threshold being arranged inside, LED circuit turns on into photograph
Bright pattern, and when the illuminance detected is not less than the reference threshold being arranged inside, LED circuit is closed.Band light-sensing function
Linear constant current LED circuit can automatically turn on or close according to the light and shade of environment, increasingly be widely used in outdoor
Street lamp landscape and the illumination of indoor passageway.
The existing linear constant current LED circuit with light-sensing function includes LED illuminating circuits, AC to DC converter circuit, line
Property constant-current circuit, serial voltage regulation circuit, photoinduction circuit and single chip machine controlling circuit, as shown in Figure 1.Wherein LED shines electric
There is positive input terminal and negative input end, AC to DC converter circuit to have firewire input terminal, zero curve input, output end and ground connection on road
There is input terminal, control terminal, output and ground, serial voltage regulation circuit to have input terminal, output for end, linear constant current circuit
End and ground terminal；There is photoinduction circuit input, output end and ground terminal, single chip machine controlling circuit to have input terminal, control
End, output and ground；The firewire of the firewire input termination alternating current of AC to DC converter circuit, the zero of zero curve input termination alternating current
Line, output end, the positive input terminal of LED illuminating circuits of AC to DC converter circuit are connected with the input terminal of serial voltage regulation circuit,
The negative input end of LED illuminating circuits is connected with the output end of linear constant current circuit；The output end of serial voltage regulation circuit, linear perseverance
The input terminal of current circuit, the input terminal of single chip machine controlling circuit are connected with the input terminal of photoinduction circuit；Photoinduction circuit it is defeated
Outlet is connected with the control terminal of single chip machine controlling circuit, the output end of single chip machine controlling circuit and the control terminal of linear constant current circuit
Connection, the ground terminal of AC to DC converter circuit, the ground terminal of serial voltage regulation circuit, the ground terminal of single chip machine controlling circuit, light
The ground terminal of sensor circuit is connected with the ground terminal of linear constant current circuit.
Although the performance indicator of the existing linear constant current LED circuit with light-sensing function is higher, there is certain performance
Advantage.But for being only used as street lamp or Landscape Lighting purposes, the linear constant current LED circuit with light-sensing function at
This is also top-priority index.The serial voltage regulation circuit and single chip machine controlling circuit used in the linear constant current LED circuit,
Wherein, serial voltage regulation circuit will meet the power reguirements of single chip machine controlling circuit, thus the index of the serial voltage regulation circuit
More demanding, cost is higher, while the use of single chip machine controlling circuit also increases cost, thus the linear constant current LED circuit
High expensive, reduce its competitive advantage.
Invention content
Technical problem to be solved by the invention is to provide one kind on the basis of ensureing high performance, lower-cost band light
The linear constant current LED circuit of inducing function.
Technical solution is used by the present invention solves above-mentioned technical problem：A kind of linear constant current with light-sensing function
LED circuit, including LED illuminating circuits, AC to DC converter circuit, linear constant current circuit and photoinduction circuit, the LED shine
There is circuit positive input terminal and negative input end, the AC to DC converter circuit to have firewire input terminal, zero curve input terminal, output
End and ground terminal, the photoinduction circuit have input, output end and ground terminal, the fire of the AC to DC converter circuit
Line input terminal is used to connect the firewire of alternating current, and zero curve input terminal is used to connect the zero curve of alternating current, and the linear constant current circuit has defeated
Enter end, the first control terminal, the second control terminal, output and ground, the negative input end of the LED illuminating circuits and described
The output end of linear constant current circuit connects, and the linear constant current LED circuit further includes Parallel Voltage Regulator Circuit circuit, state holding electricity
Road, voltage smoothing circuit and resistor voltage divider circuit, the Parallel Voltage Regulator Circuit circuit have input, output end and ground terminal,
State retaining circuit, the voltage smoothing circuit and the resistor voltage divider circuit is respectively provided with input terminal, output
End and ground terminal, the output end of the AC to DC converter circuit, the input terminal of the voltage smoothing circuit and the electricity
Hinder bleeder circuit input terminal connection, the output end of the voltage smoothing circuit, the LED illuminating circuits positive input terminal
It is connected with the input terminal of the Parallel Voltage Regulator Circuit circuit, the output end of the Parallel Voltage Regulator Circuit circuit, the linear perseverance
The input terminal of current circuit is connected with the input terminal of the photoinduction circuit, the output end of the photoinduction circuit and described
The input terminal of state retaining circuit connects, the output end of the state retaining circuit and the second of the linear constant current circuit
Control terminal connects, and the output end of the resistor voltage divider circuit is connected with the first control terminal of the linear constant current circuit, institute
The ground terminal for the AC to DC converter circuit stated, the ground terminal of the Parallel Voltage Regulator Circuit circuit, the state retaining circuit
Ground terminal, the ground terminal of the photoinduction circuit, the ground terminal of the linear constant current circuit, the voltage smoothing circuit
Ground terminal connected with the ground terminal of the resistor voltage divider circuit.
The resistor voltage divider circuit includes first resistor and second resistance, and one end of the first resistor is described
The input terminal of resistor voltage divider circuit, the other end of the first resistor is connected with one end of the second resistance and it is connected
End is the output end of the resistor voltage divider circuit, and the other end of the second resistance is connecing for the resistor voltage divider circuit
Ground terminal.In the circuit, the high voltage that AC to DC converter circuit is exported is divided by first resistor and second resistance, is converted
To be suitble to the low-voltage of linear constant current circuit work, the normal working signal sampling of guarantee linear constant current circuit is simple in structure, at
This is relatively low.
The voltage smoothing circuit includes the first capacitance and the first diode, and first diode is two pole of rectification
Pipe, first capacitance are electrolytic capacitor, the just extremely input of the voltage smoothing circuit of first diode
The anode of end, the cathode of first diode and first capacitance connects and its connecting pin is that the voltage is smooth
The output end of circuit, the cathode of first capacitance are the ground terminal of the voltage smoothing circuit.The circuit passes through first
Capacitance is filtered, by the prodigious DC voltage conversion of voltage fluctuation of AC to DC converter circuit output at maintaining higher electricity
Pressure, and smaller DC voltage is fluctuated, ensure the work requirements of LED illuminating circuits and Parallel Voltage Regulator Circuit circuit, and utilize first
The one-way conduction of diode makes the output end voltage of this circuit not interfere with the voltage change of input terminal.
The Parallel Voltage Regulator Circuit circuit includes 3rd resistor, the second capacitance and the second diode, second capacitance
For electrolytic capacitor, second diode is zener diode, and one end of the 3rd resistor is that the parallel connection type is steady
The input terminal of volt circuit, the other end of the 3rd resistor, the cathode of second diode and second capacitance
Anode connection and output end that its connecting pin is the Parallel Voltage Regulator Circuit circuit, the anode of second diode and institute
The ground terminal that the cathode for the second capacitance stated connects and its connecting pin is the Parallel Voltage Regulator Circuit circuit.The circuit is with the two or two
Pole pipe realizes voltage stabilizing function as basic voltage stabilizing element, with minimum cost, is provided for linear constant current circuit and photoinduction circuit
Operating voltage.
The photoinduction circuit includes the 4th resistance and phototriode, and one end of the 4th resistance is described
The other end of the input terminal of photoinduction circuit, the 4th resistance is connected and is connected with the collector of the phototriode
End is the output end of the photoinduction circuit, the ground connection of the transmitting extremely photoinduction circuit of the phototriode
End.The circuit detects intensity of illumination by photosensitive triode, the setting of illumination threshold value is realized by the 4th resistance, in photosensitive three-level
When the intensity of illumination that pipe detects is less than illumination threshold value, the output end of photoinduction circuit has electric current output, when intensity of illumination is not small
When illumination threshold value, the output end no current of photoinduction circuit exports, and thus realizes light-sensing function using lower cost.
The state retaining circuit includes third diode, third capacitance and the 5th resistance, and the third capacitance is
Conventional capacitive, the third diode are rectifier diode, and the just extremely described state of the third diode is kept
The input terminal of circuit, the cathode of the third diode, one end of the third capacitance and the 5th resistance one
End connection and the output end that its connecting pin is the state retaining circuit, the other end of the third capacitance and described the
The ground terminal that the other end of five resistance connects and its connecting pin is the state retaining circuit.In the circuit, in intensity of illumination
When less than illumination threshold value in photoinduction circuit, the electric current that photoinduction circuit exports gives state retaining circuit charging, and state is made to protect
The output voltage for holding the output end of circuit increases, within a certain period of time, even if when photoinduction circuit does not have electric current output, state
The output end of holding circuit remains high voltage, when photoinduction circuit exports in longer period of time without electric current, shape
The output end voltage of state holding circuit can be reduced slowly, until leveling off to no-voltage, the state retaining circuit and photoinduction circuit
It matches, the leakage current index request to realizing the electronic component used in circuit structure is relatively low, and heat resistance is preferable.
The linear constant current circuit includes the constant current chip of model SM2083, the 6th resistance, the 7th resistance, the four or two
Pole pipe, the 5th diode and NMOS tube, the 4th diode and the 5th diode are zener diode, described
Constant current chip the 1st foot be the linear constant current circuit input terminal, the 8th foot of the constant current chip is the line
The output end of property constant-current circuit, the 4th foot of the constant current chip, the cathode of the 4th diode, the described the 5th 2
The anode of pole pipe is connected with one end of the 6th resistance, and the cathode of the 5th diode is that the linear constant current is electric
5th foot of first control terminal on road, the constant current chip is connected with one end of the 7th resistance, the 7th resistance
The other end connected with the drain electrode of the NMOS tube, the grid of the NMOS tube is the second of the linear constant current circuit
Control terminal, the other end of the 6th resistance, the source electrode of positive, described NMOS tube of the 4th diode and described
Constant current chip the 3rd foot connection and its connecting pin be the linear constant current circuit ground terminal.In the linear constant current circuit,
By the cooperation of the 6th resistance, the 7th resistance, the 4th diode, the 5th diode and NMOS tube and chip SM2083, make original
Only there are one the linear constant current circuits of control port to expand to two control ports, and the circuit structure of linear constant current circuit determines
, each of which control terminal all has corresponding threshold voltage, when the voltage of the first control terminal access is higher than its threshold voltage, the
The access of one control terminal is out level signal, when the voltage of the first control terminal access is not higher than its voltage threshold, first
Control terminal access be close level signal, with should the second control terminal access voltage be higher than its voltage threshold when, second control
Terminate into be out level signal, when the second control terminal access voltage be not higher than its voltage threshold when, the second control terminal access
Be to close level signal, when the first control terminal and the second control terminal access and open level signal, the output end of linear constant current circuit
There is electric current output, when level signal is closed at least one access in the first control terminal and the second control terminal, linear constant current circuit
Output end no current exports, and the linear constant current circuit is simple in structure, and reliability is high.
The AC to DC converter circuit includes full bridge rectifier bridge, and the 1st foot of the full bridge rectifier bridge is the friendship
The firewire input terminal of circulation DC circuit, the 3rd foot of the full bridge rectifier bridge are the zero curve of the AC to DC converter circuit
Input terminal, the 2nd foot of the full bridge rectifier bridge are the output end of the AC to DC converter circuit, the full bridge rectifier bridge
The 4th foot be the AC to DC converter circuit ground terminal.
Compared with the prior art, the advantages of the present invention are as follows by using Parallel Voltage Regulator Circuit circuit substitution tandem type voltage stabilizing electricity
Road, state retaining circuit replace single chip machine controlling circuit, increase voltage smoothing circuit and resistor voltage divider circuit, Parallel Voltage Regulator Circuit electricity
Road use zener diode as core voltage stabilizing element, relative to needing first to be changed into low-voltage from high voltage, then integrated
The serial voltage regulation circuit of circuit voltage stabilizing, it is simple in structure, circuit cost is greatly reduced, state retaining circuit is that sexual valence is relatively high
Heat safe analog circuit, for the current signal of the output of photoinduction circuit to be changed into the voltage that can keep a period of time
Signal is conveyed to linear constant current circuit, instead of heat safe single chip machine controlling circuit is not easy, greatly improves LED circuit
Control reliability makes the linear constant current LED circuit have higher performance indicator, and the output voltage of voltage smoothing circuit can be with one
The voltage higher than LED illuminating circuit voltages directly is maintained, sufficiently high operating voltage, electric resistance partial pressure are provided for LED illuminating circuits
Circuit is reduced to the high voltage for the steamed bun waveform that AC to DC converter circuit exports the low-voltage of same waveform, keeps linear constant current electric
First control terminal on road generates periodically variable voltage, ensures linear constant current circuit to the periodic short of LED illuminating circuits
The control function of time cut-off current, thus the linear constant current LED circuit with light-sensing function of the invention is in guarantee high-performance
On the basis of, cost is relatively low, has higher cost performance, use easy to spread.
Description of the drawings
Fig. 1 is the structure diagram of the existing linear constant current LED circuit with light-sensing function；
Fig. 2 is the structure diagram of the linear constant current LED circuit with light-sensing function of the present invention；
Fig. 3 is the circuit diagram of the linear constant current LED circuit with light-sensing function of the present invention；
The output end voltage oscillogram of the AC to DC converter circuit of Fig. 4 present invention；
The voltage oscillogram of the output end of the voltage smoothing circuit of Fig. 5 present invention.
Specific implementation mode
Below in conjunction with attached drawing embodiment, present invention is further described in detail.
Embodiment one：As shown in Fig. 2, a kind of linear constant current LED circuit with light-sensing function, including LED illuminating circuits,
AC to DC converter circuit, linear constant current circuit and photoinduction circuit, LED illuminating circuits have positive input terminal and negative input end, hand over
There is the DC circuit that circulates firewire input terminal, zero curve input, output end and ground terminal, photoinduction circuit to have input terminal, defeated
Outlet and ground terminal, the firewire input terminal of AC to DC converter circuit are used to connect the firewire of alternating current, and zero curve input terminal is for connecing alternating current
Zero curve, linear constant current circuit have input terminal, the first control terminal, the second control terminal, output and ground, LED shine electricity
The negative input end on road is connected with the output end of linear constant current circuit, and linear constant current LED circuit further includes Parallel Voltage Regulator Circuit circuit, shape
State holding circuit, voltage smoothing circuit and resistor voltage divider circuit, Parallel Voltage Regulator Circuit circuit have input, output end and ground connection
End, state retaining circuit, voltage smoothing circuit and resistor voltage divider circuit are respectively provided with input, output end and ground terminal, exchange
Turn the output end of DC circuit, the input terminal of voltage smoothing circuit is connected with the input terminal of resistor voltage divider circuit, voltage is smoothly electric
The output end on road, the positive input terminal of LED illuminating circuits are connected with the input terminal of Parallel Voltage Regulator Circuit circuit, Parallel Voltage Regulator Circuit circuit
Output end, the input terminal of linear constant current circuit are connected with the input terminal of photoinduction circuit, the output end and state of photoinduction circuit
The input terminal of holding circuit connects, and the output end of state retaining circuit and the second control terminal of linear constant current circuit connect, resistance
The output end of bleeder circuit is connected with the first control terminal of linear constant current circuit, ground terminal, the parallel connection type of AC to DC converter circuit
The ground connection of the ground terminal of regulator circuit, the ground terminal of state retaining circuit, the ground terminal of photoinduction circuit, linear constant current circuit
End, the ground terminal of voltage smoothing circuit are connected with the ground terminal of resistor voltage divider circuit.
The operation principle of the linear constant current LED circuit with light-sensing function of the present embodiment is：AC to DC converter circuit will
The sine wave AC voltage of the alternating current of outside access is converted to the prodigious high-voltage dc voltage of voltage fluctuation, the high-voltage dc voltage
For steamed bun waveform, oscillogram is as shown in Figure 4.Voltage smoothing circuit turns the high-voltage dc voltage of the steamed bun waveform inputted in it
More smooth high-voltage dc voltage is turned to, the waveform of the high-voltage dc voltage is as shown in figure 5, the high-voltage dc voltage is big always
In the voltage of LED illuminating circuits, operating voltage is provided to LED illuminating circuits.Parallel Voltage Regulator Circuit circuit is defeated voltage smoothing circuit
The high-voltage dc voltage gone out is changed into constant low pressure power supply, and operating voltage is provided for linear constant current circuit and photoinduction circuit.Electricity
Resistance bleeder circuit is depressured the high-voltage dc voltage for inputting the steamed bun waveform in it, obtains low-voltage output, the low-voltage
Also it is steamed bun waveform, interior there are at the time of high voltage and at the time of low voltage, photoinduction circuit is in intensity of illumination ratio
When smaller, output end has electric current output, state retaining circuit by the current signal that photoinduction circuit exports be converted to compared with
High voltage signal is exported in output end, and is kept for a period of time；And when intensity of illumination is stronger, the output of photoinduction circuit
No current output is held, then the output voltage of state retaining circuit output end becomes low voltage at leisure, when the first control terminal
When the voltage of access is higher than its threshold voltage, the access of the first control terminal is out level signal, when the electricity of the first control terminal access
Pressure not higher than its voltage threshold when, the first control terminal access be close level signal, with should the second control terminal access
When voltage is higher than its voltage threshold, the access of the second control terminal is out level signal, when the voltage of the second control terminal access is not high
When its voltage threshold, the access of the second control terminal is to close level signal, when the first control terminal and the second control terminal are accessed and opened
The output end of level signal, linear constant current circuit has electric current output, and LED illuminating circuits shine at this time, when the first control terminal and the
When level signal is closed at least one access in two control terminals, the output end no current output of linear constant current circuit, LED illuminating circuits
Do not shine, due to the first control terminal in linear constant current circuit switch level signal intensity quickly, be invisible to the naked eye its shine
With non-luminous variation, and the switch level signal intensity of the second control terminal of linear constant current circuit is slower, as long as so linear
The voltage of second control terminal of constant-current circuit is out that level signal, LED illuminating circuits show as shining, whereas if linear permanent
The voltage of second control terminal of current circuit is to close level signal, and the performance of LED illuminating circuits does not shine, and is not sent out in LED illuminating circuits
At the time of light, at the time of being that intensity of illumination is minimum, if the intensity of illumination that photoinduction circuit detects at this time is less than photoinduction electricity
Illumination threshold value in road is to open level model in the voltage of the second control terminal of linear constant current circuit, if photoinduction circuit one
Intensity of illumination cannot directly be detected less than the illumination threshold value in photoinduction circuit, then the voltage in the second control terminal is powered-down flat
Signal, so when photoinduction circuit detects the intensity of illumination of the low threshold value of illumination in the inner, LED illuminating circuits shine, when
When photoinduction circuit cannot detect the intensity of illumination of the low threshold value of illumination in the inner, LED illuminating circuits will not shine.Light as a result,
Sensor circuit, resistor voltage divider circuit and linear constant current circuit cooperation, realize the control of LED illuminating circuits.
Embodiment two：As shown in Figures 2 and 3, a kind of linear constant current LED circuit with light-sensing function, including the luminous electricity of LED
Road, AC to DC converter circuit, linear constant current circuit and photoinduction circuit, LED illuminating circuits have positive input terminal and negative input end,
AC to DC converter circuit have firewire input terminal, zero curve input, output end and ground terminal, photoinduction circuit have input terminal,
Output and ground, the firewire input terminal of AC to DC converter circuit are used to connect the firewire of alternating current, and zero curve input terminal is for meeting city
There is input terminal, the first control terminal, the second control terminal, output and ground, LED to shine for the zero curve of electricity, linear constant current circuit
The negative input end of circuit is connected with the output end of linear constant current circuit, linear constant current LED circuit further include Parallel Voltage Regulator Circuit circuit,
State retaining circuit, voltage smoothing circuit and resistor voltage divider circuit, Parallel Voltage Regulator Circuit circuit have input, output end and ground connection
End, state retaining circuit, voltage smoothing circuit and resistor voltage divider circuit are respectively provided with input, output end and ground terminal, exchange
Turn the output end of DC circuit, the input terminal of voltage smoothing circuit is connected with the input terminal of resistor voltage divider circuit, voltage is smoothly electric
The output end on road, the positive input terminal of LED illuminating circuits are connected with the input terminal of Parallel Voltage Regulator Circuit circuit, Parallel Voltage Regulator Circuit circuit
Output end, the input terminal of linear constant current circuit are connected with the input terminal of photoinduction circuit, the output end and state of photoinduction circuit
The input terminal of holding circuit connects, and the output end of state retaining circuit and the second control terminal of linear constant current circuit connect, resistance
The output end of bleeder circuit is connected with the first control terminal of linear constant current circuit, ground terminal, the parallel connection type of AC to DC converter circuit
The ground connection of the ground terminal of regulator circuit, the ground terminal of state retaining circuit, the ground terminal of photoinduction circuit, linear constant current circuit
End, the ground terminal of voltage smoothing circuit are connected with the ground terminal of resistor voltage divider circuit.
In the present embodiment, resistor voltage divider circuit includes first resistor R1 and second resistance R2, and one end of first resistor R1 is
The other end of the input terminal of resistor voltage divider circuit, first resistor R1 is connected with one end of second resistance R2 and its connecting pin is resistance
The output end of bleeder circuit, the other end of second resistance R2 are the ground terminal of resistor voltage divider circuit.
In the present embodiment, voltage smoothing circuit includes the first capacitance C1 and the first diode D1, the first diode D1 is whole
Flowing diode, the first capacitance C1 is electrolytic capacitor, the just extremely input terminal of voltage smoothing circuit of the first diode D1, the one or two
The anode connection of the cathode of pole pipe D1 and the first capacitance C1 and the output end that its connecting pin is voltage smoothing circuit, the first capacitance C1
Cathode be voltage smoothing circuit ground terminal.
In the present embodiment, Parallel Voltage Regulator Circuit circuit includes 3rd resistor R3, the second capacitance C2 and the second diode D2, and second
Capacitance C2 is electrolytic capacitor, and the second diode D2 is zener diode, and one end of 3rd resistor R3 is Parallel Voltage Regulator Circuit circuit
The anode of input terminal, the other end of 3rd resistor R3, the cathode of the second diode D2 and the second capacitance C2 connects and its connecting pin
Anode for the output end of Parallel Voltage Regulator Circuit circuit, the second diode D2 is connected with the cathode of the second capacitance C2 and its connecting pin is
The ground terminal of Parallel Voltage Regulator Circuit circuit.
In the present embodiment, photoinduction circuit includes the 4th resistance R4 and phototriode Q1, and one end of the 4th resistance R4 is
The other end of the input terminal of photoinduction circuit, the 4th resistance R4 is connected with the collector of phototriode Q1 and connecting pin is light sensation
Answer the output end of circuit, the ground terminal of the transmitting extremely photoinduction circuit of phototriode Q1.
In the present embodiment, state retaining circuit includes third diode D3, third capacitance C3 and the 5th resistance R5, third electricity
Appearance C3 is conventional capacitive, and third diode D3 is rectifier diode, the just extremely state retaining circuit of third diode D3 it is defeated
Enter end, the cathode of third diode D3, one end of third capacitance C3 are connected with one end of the 5th resistance R5 and its connecting pin is shape
The output end of state holding circuit, the other end of third capacitance C3 and the other end of the 5th resistance R5 connect and its connecting pin is state
The ground terminal of holding circuit.
In the present embodiment, linear constant current circuit includes the constant current chip U1, the 6th resistance R6, the 7th electricity of model SM2083
R7, the 4th diode D4, the 5th diode D5 and NMOS tube M1 are hindered, the 4th diode D4 and the 5th diode D5 are voltage stabilizing two
Pole pipe, the 1st foot of constant current chip U1 are the input terminal of linear constant current circuit, and the 8th foot of constant current chip U1 is linear constant current circuit
Output end, the 4th foot of constant current chip U1, the anode and the 6th resistance R6 of the cathode of the 4th diode D4, the 5th diode D5
One end connection, the cathode of the 5th diode D5 is the first control terminal of linear constant current circuit, the 5th foot of constant current chip U1 and the
One end of seven resistance R7 connects, and the other end of the 7th resistance R7 is connected with the drain electrode of NMOS tube M1, and the grid of NMOS tube M1 is line
Second control terminal of property constant-current circuit, the other end of the 6th resistance R6, the anode of the 4th diode D4, the source electrode of NMOS tube M1 and
The ground terminal that the 3rd foot of constant current chip U1 connects and its connecting pin is linear constant current circuit.
In the present embodiment, AC to DC converter circuit includes full bridge rectifier bridge, and the 1st foot of full bridge rectifier bridge is that exchange turns direct current
The firewire input terminal of circuit, the 3rd foot of full bridge rectifier bridge are the zero curve input terminal of AC to DC converter circuit, the of full bridge rectifier bridge
2 feet are the output end of AC to DC converter circuit, and the 4th foot of full bridge rectifier bridge is the ground terminal of AC to DC converter circuit.
In the present embodiment, LED illuminating circuits are formed by n light emitting diode (N1-Nn) series connection, and n is whole more than or equal to 1
Number.
Claims (8)
1. a kind of linear constant current LED circuit with light-sensing function, including LED illuminating circuits, AC to DC converter circuit, linear perseverance
There is positive input terminal and negative input end, the exchange to turn direct current for current circuit and photoinduction circuit, the LED illuminating circuits
There is firewire input terminal, zero curve input, output end and ground terminal, the photoinduction circuit to have input, output end on road
And ground terminal, the firewire input terminal of the AC to DC converter circuit are used to connect the firewire of alternating current, zero curve input terminal is for meeting city
The zero curve of electricity, it is characterised in that the linear constant current circuit has input terminal, the first control terminal, the second control terminal, output end
And ground terminal, the negative input end of the LED illuminating circuits are connected with the output end of the linear constant current circuit, the line
Property constant-current LED circuit further includes Parallel Voltage Regulator Circuit circuit, state retaining circuit, voltage smoothing circuit and resistor voltage divider circuit, institute
The Parallel Voltage Regulator Circuit circuit stated has input, output end and ground terminal, and the state retaining circuit, the voltage are smooth
Circuit and the resistor voltage divider circuit are respectively provided with input, output end and ground terminal, the AC to DC converter circuit
Output end, the voltage smoothing circuit input terminal connected with the input terminal of the resistor voltage divider circuit, the voltage
The input terminal of the output end of smooth circuit, the positive input terminal of the LED illuminating circuits and the Parallel Voltage Regulator Circuit circuit connects
It connects, the output end of the Parallel Voltage Regulator Circuit circuit, the input terminal of the linear constant current circuit and the photoinduction circuit
Input terminal connection, the output end of the photoinduction circuit is connected with the input terminal of the state retaining circuit, described
The output end of state retaining circuit is connect with the second control terminal of the linear constant current circuit, the resistor voltage divider circuit
Output end is connected with the first control terminal of the linear constant current circuit, the ground terminal of the AC to DC converter circuit, described
The ground terminal of Parallel Voltage Regulator Circuit circuit, the ground terminal of the state retaining circuit, the photoinduction circuit ground terminal,
The ground terminal of the linear constant current circuit, the ground terminal of the voltage smoothing circuit and connecing for the resistor voltage divider circuit
Ground terminal connects.
2. a kind of linear constant current LED circuit with light-sensing function according to claim 1, it is characterised in that the electricity
Resistance bleeder circuit includes first resistor and second resistance, and one end of the first resistor is the defeated of the resistor voltage divider circuit
Enter end, the other end of the first resistor is connected with one end of the second resistance and its connecting pin is the resistance point
The output end of volt circuit, the other end of the second resistance are the ground terminal of the resistor voltage divider circuit.
3. a kind of linear constant current LED circuit with light-sensing function according to claim 1, it is characterised in that the electricity
It includes the first capacitance and the first diode to press smooth circuit, and first diode is rectifier diode, the described first electricity
It is electrolytic capacitor to hold, the input terminal of the just extremely described voltage smoothing circuit of first diode, the described the 1st
The anode connection of the cathode of pole pipe and first capacitance and the output end that its connecting pin is the voltage smoothing circuit, institute
The cathode for the first capacitance stated is the ground terminal of the voltage smoothing circuit.
4. a kind of linear constant current LED circuit with light-sensing function according to claim 1, it is characterised in that it is described and
Connection type regulator circuit includes 3rd resistor, the second capacitance and the second diode, and second capacitance is electrolytic capacitor, described
Second diode is zener diode, and one end of the 3rd resistor is the input terminal of the Parallel Voltage Regulator Circuit circuit, institute
The anode connection and its connection of the other end for the 3rd resistor stated, the cathode of second diode and second capacitance
End is the output end of the Parallel Voltage Regulator Circuit circuit, the anode of second diode and the cathode of second capacitance
Connection and the ground terminal that its connecting pin is the Parallel Voltage Regulator Circuit circuit.
5. a kind of linear constant current LED circuit with light-sensing function according to claim 1, it is characterised in that the light
Sensor circuit includes the 4th resistance and phototriode, and one end of the 4th resistance is the input of the photoinduction circuit
End, the other end of the 4th resistance is connected with the collector of the phototriode and connecting pin is the photoinduction
The output end of circuit, the ground terminal of the transmitting extremely photoinduction circuit of the phototriode.
6. a kind of linear constant current LED circuit with light-sensing function according to claim 1, it is characterised in that the shape
State holding circuit includes third diode, third capacitance and the 5th resistance, and the third capacitance is conventional capacitive, and described the
Three diodes are rectifier diode, and the input terminal of the just extremely described state retaining circuit of the third diode is described
The cathode of third diode, one end of the third capacitance is connected with one end of the 5th resistance and its connecting pin is
The output end of the state retaining circuit, the other end of the third capacitance are connected with the other end of the 5th resistance
And the ground terminal that its connecting pin is the state retaining circuit.
7. a kind of linear constant current LED circuit with light-sensing function according to claim 1, it is characterised in that the line
Property constant-current circuit includes the constant current chip of model SM2083, the 6th resistance, the 7th resistance, the 4th diode, the 5th diode
And NMOS tube, the 4th diode and the 5th diode are zener diode, and the 1st of the constant current chip the
Foot is the input terminal of the linear constant current circuit, and the 8th foot of the constant current chip is the defeated of the linear constant current circuit
Outlet, the 4th foot of the constant current chip, the cathode of the 4th diode, the anode of the 5th diode and institute
The one end for the 6th resistance stated connects, and the cathode of the 5th diode is the first control of the linear constant current circuit
End, the 5th foot of the constant current chip are connected with one end of the 7th resistance, the other end of the 7th resistance and institute
The drain electrode for the NMOS tube stated connects, and the grid of the NMOS tube is the second control terminal of the linear constant current circuit, described
The other end of the 6th resistance, the 4th diode positive, described NMOS tube source electrode and the constant current chip
The 3rd foot connection and its connecting pin be the linear constant current circuit ground terminal.
8. a kind of linear constant current LED circuit with light-sensing function according to claim 1, it is characterised in that the friendship
The DC circuit that circulates includes full bridge rectifier bridge, and the 1st foot of the full bridge rectifier bridge is the fire of the AC to DC converter circuit
Line input terminal, the 3rd foot of the full bridge rectifier bridge are the zero curve input terminal of the AC to DC converter circuit, the full-bridge
2nd foot of rectifier bridge is the output end of the AC to DC converter circuit, and the 4th foot of the full bridge rectifier bridge is the friendship
The ground terminal of circulation DC circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810412756.5A CN108650732B (en) | 2018-05-03 | 2018-05-03 | Linear constant-current LED circuit with light sensing function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810412756.5A CN108650732B (en) | 2018-05-03 | 2018-05-03 | Linear constant-current LED circuit with light sensing function |
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| CN108650732B CN108650732B (en) | 2024-02-23 |
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| CN108650732B (en) | 2024-02-23 |
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Effective date of registration: 20200211 Address after: 322009 NO.901, Longqi Road, Suxi Town, Yiwu City, Jinhua City, Zhejiang Province Applicant after: Harmony Mingxin (Yiwu) Photoelectric Technology Co.,Ltd. Address before: 312071 Zhejiang province Shaoxing Paojiang Industrial Zone No. 308 North Road in the robe Applicant before: SUNNY WORLD (SHAOXING) GREEN LIGHTING Co.,Ltd. |
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