CN104684177B - optical coupler feedback full-voltage LED drive circuit and LED lighting equipment - Google Patents
optical coupler feedback full-voltage LED drive circuit and LED lighting equipment Download PDFInfo
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- CN104684177B CN104684177B CN201310636464.7A CN201310636464A CN104684177B CN 104684177 B CN104684177 B CN 104684177B CN 201310636464 A CN201310636464 A CN 201310636464A CN 104684177 B CN104684177 B CN 104684177B
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- 230000003287 optical effect Effects 0.000 title description 4
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- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 48
- 238000004146 energy storage Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000013021 overheating Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The embodiment of the invention discloses an optocoupler feedback full-voltage LED drive circuit and LED lighting equipment, which comprise: the chip U1, input protection circuit, feedback circuit, tank circuit, filter circuit, overvoltage crowbar, voltage stabilizing circuit, wherein, the negative pole of input protection circuit links to each other with chip U1 for adjust input voltage, feedback circuit links to each other with chip U1, be used for providing feedback for chip U1, output stable voltage, tank circuit links to each other with chip U1, be used for storing the electric energy, filter circuit links to each other with tank circuit, be used for the filtering, overvoltage crowbar links to each other with the positive pole of input protection circuit, be used for when feedback circuit became invalid, maintain output stable voltage, voltage stabilizing circuit with tank circuit links to each other, be used for the steady voltage. The embodiment of the invention can provide stable direct current voltage for the LED without a transformer, has a voltage range suitable for global wide voltage (after 85VAC to 265VAC rectification), and has the advantages of simple structure, low failure rate and low cost.
Description
Technical Field
the invention relates to the field of lighting systems, in particular to an optocoupler feedback full-voltage LED driving circuit and LED lighting equipment.
background
Since the LED is a semiconductor device with sensitive characteristics and has negative temperature characteristics, it needs to be protected during use. The requirements of the LED device on a driving power supply are almost harsh, the LED is different from a common incandescent bulb, the common incandescent bulb can be directly connected with 220V alternating current mains supply, the LED only needs to be driven by 2-3V low voltage, and an LED driving circuit is required.
LED lamps of different usage need be equipped with different drive circuit and power adapter, and LED drive circuit structure among the prior art is complicated, and the fault rate is high, and efficiency is lower, causes very big inconvenience for the user.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide an optocoupler feedback full voltage LED driving circuit and an LED lighting device, where the circuit does not need a transformer, and the voltage range is suitable for a global wide voltage (after 85VAC to 265VAC rectification).
The optocoupler feedback full voltage LED drive circuit provided by the embodiment of the invention comprises: chip U1, input protection circuit, feedback circuit, tank circuit, filter circuit, overvoltage protection circuit, voltage regulator circuit, wherein,
The negative electrode of the input protection circuit is connected with the chip U1 and used for adjusting input voltage, the feedback circuit is connected with the chip U1 and used for providing feedback for the chip U1 and outputting stable voltage, the energy storage circuit is connected with the chip U1 and used for storing electric energy, the filter circuit is connected with the energy storage circuit and used for filtering, the overvoltage protection circuit is connected with the positive electrode of the input protection circuit and used for maintaining stable voltage output when the feedback circuit fails, and the voltage stabilizing circuit is connected with the energy storage circuit and used for stabilizing voltage.
as an optional implementation, the input protection circuit includes: socket CON1, fuse F1, thermistor M1, first capacitor C1, second capacitor C2, transformer T1, third capacitor C3, first diode D1, second diode D2, third diode D3 and fourth diode D4, wherein,
one end of the socket CON1 is connected to one end of the fuse F1, and the other end is connected to one end of the thermistor M1;
The other end of the fuse F1 is simultaneously connected with one end of the first capacitor C1 and the other end of the thermistor M1;
one end of the first capacitor C1 is further connected to one end of the transformer T1, and the other end of the first capacitor C1 is connected to one end of the second capacitor C2;
the other end of the second capacitor C2 is connected with one end of the transformer T1 and one end of the thermistor M1 at the same time;
One end of the third resistor C3 is connected to the other end of the transformer and one ends of the first diode D1 and the second diode D2, respectively, and the other end of the third resistor C3 is connected to one ends of the fourth diode D4 and the third diode D3, respectively;
the first diode D1 is connected in series with the fourth diode D4 and the second diode D2 is connected in series with the third diode D3 in parallel.
as an optional implementation, the feedback circuit includes: a first transistor Q1 and a fourth capacitor C4, wherein,
An emitter of the first triode Q1 is connected with the FB pin of the chip U1, and a collector of the first triode Q1 is simultaneously connected with the BP pin of the chip U1 and one end of a fourth capacitor C4;
the other end of the fourth capacitor C4 is connected to the S pin of the chip U1.
As an alternative embodiment, the first transistor Q1 includes: an optocoupler triode.
As an optional implementation, the filter circuit is connected to the tank circuit, and the tank circuit includes: a fifth diode D5 and a first inductor L1, wherein,
the anode of the fifth diode D5 is connected to the pin D of the chip U1 and one end of the first inductor L1, respectively, and the cathode of the fifth diode D5 is connected to the anode of the input protection circuit.
As an optional implementation, the filter circuit includes: a fifth capacitor C5, wherein,
one end of the fifth capacitor C5 is connected to the other end of the first inductor L1, and the other end of the fifth capacitor C5 is connected to the cathode of the fifth diode D5.
As an alternative embodiment, the overvoltage protection circuit includes: a first resistor R1, a sixth diode D6, and a seventh diode D7, wherein,
One end of the first resistor R1 is connected to the cathode of the sixth diode D6, and the other end of the first resistor R1 is connected to the anode of the input protection circuit;
An anode of the sixth diode D6 is connected to an anode of the seventh diode D7.
As an optional implementation, the voltage stabilizing circuit comprises: an eighth diode D8, a second resistor R2, and a zener diode Z1, wherein,
an anode of the eighth diode D8 is connected to one end of the second resistor R2, and a cathode of the eighth diode D8 is connected to the other end of the second resistor R2;
The cathode of the voltage regulator tube Z1 is connected with the cathode of the eighth diode D8 and the other end of the second resistor R2, and the anode of the voltage regulator tube Z1 is connected with a load.
As an alternative embodiment, the eighth diode D8 includes: a light emitting diode.
correspondingly, the embodiment of the invention also provides LED lighting equipment which comprises the optical coupler feedback full-voltage LED driving circuit.
According to the optocoupler feedback full-voltage LED driving circuit and the LED lighting equipment provided by the embodiment of the invention, the circuit can provide stable direct-current voltage for the LED without a transformer, the voltage range is suitable for global wide voltage (after 85VAC to 265VAC rectification), the structure is simple, the fault rate is low, and the cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optocoupler feedback full voltage LED driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optocoupler feedback full voltage LED driving circuit according to another embodiment of the present invention.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic diagram of a structure of an optocoupler feedback full voltage LED driving circuit according to an embodiment of the present invention is shown, where the optocoupler feedback full voltage LED driving circuit of the present invention can provide a stable voltage for an LED without a transformer, and includes: chip U1, input protection circuit 10, feedback circuit 20, tank circuit 30, filter circuit 40, overvoltage protection circuit 50, voltage regulator circuit 60, wherein,
the negative electrode of the input protection circuit is connected with the chip U1 and used for adjusting input voltage, the feedback circuit is connected with the chip U1 and used for providing feedback for the chip U1 and outputting stable voltage, the energy storage circuit is connected with the chip U1 and used for storing electric energy, the filter circuit is connected with the energy storage circuit and used for filtering, the overvoltage protection circuit is connected with the positive electrode of the input protection circuit and used for maintaining stable voltage output when the feedback circuit fails, and the voltage stabilizing circuit is connected with the energy storage circuit and used for stabilizing voltage.
it should be understood that the chip U1 is preferably LNK30X, and other electronic components with the same function may be selected in other embodiments of the present invention.
according to the optocoupler feedback full-voltage LED driving circuit and the LED lighting equipment provided by the embodiment of the invention, the circuit can provide stable direct-current voltage for the LED without a transformer, the voltage range is suitable for global wide voltage (after 85VAC to 265VAC rectification), the structure is simple, the fault rate is low, and the cost is low.
Referring to fig. 2, a schematic diagram of a structure of an optocoupler feedback full voltage LED driving circuit according to another embodiment of the present invention is shown, where the optocoupler feedback full voltage LED driving circuit of the present invention can provide a stable voltage for an LED without a transformer, and includes: the LED lighting circuit comprises a chip U1, an input protection circuit 10, a feedback circuit 20, an energy storage circuit 30, a filter circuit 40, an overvoltage protection circuit 50, a voltage stabilizing circuit 60, and certainly, a load 70, where the load 70 includes 3 LED lamps in the embodiment of the present invention, in other embodiments of the present invention, a user may adjust the number of LEDs according to actual needs, which is not limited by the present invention.
The input protection circuit 10 is connected to the chip U1 for regulating the input voltage, and includes: socket CON1, fuse F1, thermistor M1, first capacitor C1, second capacitor C2, transformer T1, third capacitor C3, first diode D1, second diode D2, third diode D3 and fourth diode D4, wherein,
One end of the socket CON1 is connected to one end of the fuse F1, and the other end is connected to one end of the thermistor M1;
the other end of the fuse F1 is simultaneously connected with one end of the first capacitor C1 and the other end of the thermistor M1;
One end of the first capacitor C1 is further connected to one end of the transformer T1, and the other end of the first capacitor C1 is connected to one end of the second capacitor C2;
The other end of the second capacitor C2 is connected with one end of the transformer T1 and one end of the thermistor M1 at the same time;
one end of the third resistor C3 is connected to the other end of the transformer and one ends of the first diode D1 and the second diode D2, respectively, and the other end of the third resistor C3 is connected to one ends of the fourth diode D4 and the third diode D3, respectively;
The first diode D1 is connected in series with the fourth diode D4 and the second diode D2 is connected in series with the third diode D3 in parallel.
the feedback circuit 20 is connected to the chip U1, and is configured to provide feedback to the chip U1, and includes: a first transistor Q1 and a fourth capacitor C4, wherein,
an emitter of the first triode Q1 is connected with the FB pin of the chip U1, and a collector of the first triode Q1 is simultaneously connected with the BP pin of the chip U1 and one end of a fourth capacitor C4;
the other end of the fourth capacitor C4 is connected to the S pin of the chip U1. The size of the fourth capacitor C4 can be selected to be 0.1 muf to achieve high frequency decoupling and energy storage.
it should be noted that when the current flowing into the FB pin of the chip U1 is greater than 49 μ a (the voltage is 1.65V), the chip U1 internally outputs a low logic level signal (disable signal). The first transistor Q1 will remain off (disabled). When the current flowing into the FB pin is less than 49 μ a. The internal feedback circuit of the chip U1 outputs a high logic level signal (disable signal). The first transistor Q1 will remain on (enabled).
a filter circuit 40 is coupled to the tank circuit 30, the tank circuit 30 comprising: a fifth diode D5 and a first inductor L1, wherein,
An anode of the fifth diode D5 is connected to the pin D of the chip U1 and one end of the first inductor L1, respectively, and a cathode of the fifth diode D5 is connected to an anode of the input protection circuit.
the filter circuit 40 is used for filtering, and includes: a fifth capacitor C5, wherein,
One end of the fifth capacitor C5 is connected to the other end of the first inductor L1, and the other end of the fifth capacitor C5 is connected to the cathode of the fifth diode D5.
the overvoltage protection circuit 50 is connected to the tank circuit 30, and is configured to maintain a stable output voltage when the feedback circuit 20 fails, and specifically includes: a first resistor R1, a sixth diode D6, and a seventh diode D7, wherein,
One end of the first resistor R1 is connected to the cathode of the sixth diode D6, and the other end of the first resistor R1 is connected to the anode of the input protection circuit;
An anode of the sixth diode D6 is connected to an anode of the seventh diode D7.
The voltage stabilizing circuit 60 is used for voltage stabilization, and includes: an eighth diode D8, a second resistor R2, and a zener diode Z1, wherein,
An anode of the eighth diode D8 is connected to one end of the second resistor R2, and a cathode of the eighth diode D8 is connected to the other end of the second resistor R2;
The cathode of the voltage regulator tube Z1 is connected with the cathode of the eighth diode D8 and the other end of the second resistor R2, and the anode of the voltage regulator tube Z1 is connected with a load.
It should be noted that the first transistor Q1 is an opto-coupler transistor, the light emitted from the output voltage Vo through the eighth diode D8 is received by the first transistor Q1, and the first transistor Q1 generates a photocurrent according to the intensity of the received light, wherein the photocurrent is obtained according to the Current Transmission Rate (CTR) of the selected opto-coupler and the current If of the eighth diode D8. The eighth diode D8 is a light emitting diode, and its current If can be obtained from the specification of (Vo-Vz) optocoupler or light emitting diode, so the required Vo value can be obtained by adjusting the value of the stabilivolt Z1.
The working principle of the circuit of the embodiment of the invention is as follows: the Vin input end can input 85V-265V alternating current voltage, and the Vo end can output low-voltage direct current voltage. Alternating current is input from a pin D and output from a pin S of the chip U1, a pin FB of the chip U1 is used for inputting a feedback signal, when the current flowing into the pin FB is larger than 49 μ A (the voltage is 1.65V at this time), the switch of the first triode Q1 is stopped, and a pin BP of the chip U1 is used for providing 5.8V working voltage for the chip U1. Because the BP pin of chip U1 is the power supply pin of master control, have the undervoltage protection function: the pin voltage drops below 4.85V to turn off the power MOSFET switch, and once the bypass pin voltage drops below 4.85V, it must rise back up to 5.8V to re-enable (turn on) the power MOSFET switch.
During the off period of the first transistor Q1, the fourth capacitor C4 charges to 5.8V. When the first transistor Q1 is turned on, the chip U1 is powered by the energy stored in the fourth capacitor C4, and the power consumption in the fourth capacitor C4 is very low, and the chip U1 can operate normally only by the current absorbed from the drain terminal.
In addition, the circuit of the embodiment of the invention also has an overheating protection function, the thermistor M1 detects the temperature of the silicon chip, the threshold value can be set at 142 ℃, and the hysteresis range of 75 ℃ is provided. When the junction temperature exceeds this threshold (142 ℃), the switching of the first transistor Q1 is disabled until the junction temperature drops below 75 ℃, and the first transistor Q1 will not turn back on, preventing damage from overheating the circuit.
it should be appreciated that the power consumption of the electronic components during startup and operation is directly provided by the voltage at the drain terminal, and therefore the related circuitry for bias power supply can be saved in the BUCK and flyback converters. In addition, under the condition that the circuit is in short circuit and open loop faults, the output power can be safely limited, the number of components is reduced, and the cost for the load protection circuit at a system level can be directly reduced.
According to the optocoupler feedback full-voltage LED driving circuit and the LED lighting equipment provided by the embodiment of the invention, the circuit can provide stable direct-current voltage for the LED without a transformer, the voltage range is suitable for global wide voltage (after 85VAC to 265VAC rectification), the structure is simple, the fault rate is low, and the cost is low.
The embodiment of the invention also provides LED lighting equipment which comprises the optical coupler feedback full-voltage LED driving circuit.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. An optocoupler feedback full voltage LED drive circuit, comprising: chip U1, input protection circuit, feedback circuit, tank circuit, filter circuit, overvoltage protection circuit, voltage regulator circuit, wherein,
the negative electrode of the input protection circuit is connected with the chip U1 and used for adjusting input voltage, the feedback circuit is connected with the chip U1 and used for providing feedback for the chip U1 and outputting stable voltage, the energy storage circuit is connected with the chip U1 and used for storing electric energy, the filter circuit is connected with the energy storage circuit and used for filtering, the overvoltage protection circuit is connected with the positive electrode of the input protection circuit and used for maintaining stable voltage output when the feedback circuit fails, and the voltage stabilizing circuit is connected with the energy storage circuit and used for stabilizing voltage; the input protection circuit comprises a thermistor M1, the feedback circuit comprises a first triode Q1, and the thermistor M1 is used for controlling the opening or the turn-on of a switch of the first triode Q1 according to the heated temperature; the power supply pin BP of the main control of the chip U1 is used for providing working voltage of a first preset voltage threshold value for the chip U1, when the voltage of the BP pin is smaller than or equal to a second preset voltage threshold value, a switch of a power MOSFET is turned off, after the switch of the power MOSFET is turned off, the switch of the power MOSFET is turned on when the voltage of the BP pin is detected to be equal to the first preset voltage threshold value, and the chip U1 comprises an LNK 30X.
2. the circuit of claim 1, wherein the input protection circuit comprises: socket CON1, fuse F1, thermistor M1, first capacitor C1, second capacitor C2, transformer T1, third capacitor C3, first diode D1, second diode D2, third diode D3 and fourth diode D4, wherein,
One end of the socket CON1 is connected to one end of the fuse F1, and the other end is connected to one end of the thermistor M1;
the other end of the fuse F1 is connected with one end of the first capacitor C1 and the other end of the thermistor M1 at the same time;
One end of the first capacitor C1 is further connected to one end of the transformer T1, and the other end of the first capacitor C1 is connected to one end of the second capacitor C2;
The other end of the second capacitor C2 is connected with one end of the transformer T1 and one end of the thermistor M1 at the same time;
one end of the third capacitor C3 is connected to the other end of the transformer, the cathode of the first diode D1 and the anode of the second diode D2, respectively, and the other end of the third capacitor C3 is connected to the cathode of the fourth diode D4 and the anode of the third diode D3, respectively;
an anode of the first diode D1 is connected to an anode of the fourth diode D4, and a cathode of the second diode D2 is connected to a cathode of the third diode D3.
3. The circuit of claim 1, wherein the feedback circuit comprises: a first transistor Q1 and a fourth capacitor C4, wherein,
An emitter of the first triode Q1 is connected with the FB pin of the chip U1, and a collector of the first triode Q1 is simultaneously connected with the BP pin of the chip U1 and one end of a fourth capacitor C4;
the other end of the fourth capacitor C4 is connected to the S pin of the chip U1.
4. The circuit of claim 3, wherein the first transistor Q1 comprises: an optocoupler triode.
5. The circuit of claim 1, wherein the filter circuit is coupled to the tank circuit, the tank circuit comprising: a fifth diode D5 and a first inductor L1, wherein,
The anode of the fifth diode D5 is connected to the pin D of the chip U1 and one end of the first inductor L1, respectively, the cathode of the fifth diode D5 is connected to the anode of the input protection circuit, and the other end of the first inductor L1 is connected to the cathode of the filter circuit.
6. The circuit of claim 5, wherein the filtering circuit comprises: a fifth capacitor C5, wherein,
One end of the fifth capacitor C5 is connected to the other end of the first inductor L1, and the other end of the fifth capacitor C5 is connected to the cathode of the fifth diode D5.
7. The circuit of claim 1, wherein the overvoltage protection circuit comprises: a first resistor R1, a sixth diode D6, and a seventh diode D7, wherein,
One end of the first resistor R1 is connected to the cathode of the sixth diode D6, and the other end of the first resistor R1 is connected to the anode of the input protection circuit;
The anode of the sixth diode D6 is connected to the anode of the seventh diode D7, and the cathode of the seventh diode D7 is connected to the anode of the voltage regulator circuit.
8. The circuit of claim 1, wherein an anode of the regulation circuit is connected to an anode of the filter circuit, and a cathode of the regulation circuit is connected to a cathode of the filter circuit, the regulation circuit comprising: an eighth diode D8, a second resistor R2, and a zener diode Z1, wherein,
An anode of the eighth diode D8 is connected to one end of the second resistor R2, and a cathode of the eighth diode D8 is connected to the other end of the second resistor R2;
The cathode of the voltage regulator tube Z1 is connected with the cathode of the eighth diode D8 and the other end of the second resistor R2, and the anode of the voltage regulator tube Z1 is connected with a load.
9. the circuit of claim 8, wherein the eighth diode D8 includes: a light emitting diode.
10. an LED lighting device, characterized in that the LED lighting device comprises: the optocoupler feedback full voltage LED drive circuit of any of claims 1-9.
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