CN104470083A - Protection system for blue-light LED lamp - Google Patents
Protection system for blue-light LED lamp Download PDFInfo
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- CN104470083A CN104470083A CN201410675375.8A CN201410675375A CN104470083A CN 104470083 A CN104470083 A CN 104470083A CN 201410675375 A CN201410675375 A CN 201410675375A CN 104470083 A CN104470083 A CN 104470083A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a protection system for a blue-light LED lamp. The protection system is characterized by mainly comprising a grid drive circuit, a logic control circuit, a power amplifier P1, a power amplifier P2, a pulse comparator U1, a pulse comparator U2, a field effect transistor MOS1, a field effect transistor MOS2, a field effect transistor MOS3, a field effect transistor MOS4 and the like, wherein the power amplifier P1, the power amplifier P2, the pulse comparator U1 and the pulse comparator U2 are connected with the logic control circuit, and the grid of the field effect transistor MOS1, the grid of the field effect transistor MOS2, the grid of the field effect transistor MOS3 and the grid of the field effect transistor MOS4 are connected with the grid drive circuit. The protection system has the functions of short circuit protection, overvoltage protection and open circuit protection and is low in power consumption and the power consumption of a protection circuit of the protection system only accounts for 1/3 that of a traditional protection circuit. Meanwhile, the protection system is provided with a switchable current source, so the power utilization demand of the protection circuit can be guaranteed, external electromagnetic interference can be effectively avoided, and control sensitivity and control precision are improved.
Description
Technical field
The present invention relates to a kind of LED protection circuit, specifically refer to a kind of blue LED lamp protection system.
Background technology
At present, because LED has, energy consumption is low, the feature such as long service life and safety and environmental protection, and it has become one of main product of people's life lighting.Because LED is different from traditional incandescent lamp, its needs are driven by special drive circuit, have therefore just occurred the protection system for preventing drive system from disturbing from inner or outside unfavorable factor miscellaneous on the market.
Although these protection systems all possess short-circuit protection function and overheat protective function mostly, the structure of these protection systems often all more complicated, its maintenance difficulty is larger.Meanwhile, the energy consumption of these protection systems is higher, and the dynamics effectively avoiding LED lamp drive circuit self circuit to affect is poor, can not protect by effective whole drive circuit.
Summary of the invention
The object of the invention is to overcome the complex structure existing for current LED protection system, energy consumption is higher, and the defect that general protection dynamics is poor, a kind of brand-new blue LED lamp protection system is provided.
Object of the present invention is achieved through the following technical solutions: a kind of blue LED lamp protection system, primarily of gate driver circuit, logic control circuit, the power amplifier P1 that andlogic control circuit is connected and power amplifier P2, the pulse comparator U1 that andlogic control circuit is connected and pulse comparator U2, the field effect transistor MOS1 that grid is all connected with gate driver circuit, field effect transistor MOS2, field effect transistor MOS3 and field effect transistor MOS4, and the oscillator composition be serially connected between the negative input of pulse comparator U1 and the negative input of pulse comparator U2, the source electrode of described field effect transistor MOS1 is connected with the electrode input end of pulse comparator U1, and its drain electrode is then connected with the source electrode of field effect transistor MOS2, the source electrode of field effect transistor MOS3 is connected with the electrode input end of pulse comparator U2, and its drain electrode is then connected with the source electrode of field effect transistor MOS4, the grid of described field effect transistor MOS2 is also connected with the electrode input end of power amplifier P1, its grounded drain, the grid of described field effect transistor MOS4 is also connected with the electrode input end of power amplifier P2, its grounded drain, the equal ground connection of negative input of described power amplifier P1 and power amplifier P2.
Further, described gate driver circuit is by transformer T, driving chip M, be serially connected with the switched current source between the VCC pin of driving chip M and INP pin, be serially connected with the diode D1 between the VCC pin of driving chip M and BOOST pin, be serially connected with the electric capacity C3 between the BOOST pin of driving chip M and TG pin, be serially connected with the resistance R7 between the TG pin of driving chip M and TS pin, and base stage is connected with the TG pin of driving chip M, collector electrode in turn after electric capacity C4 and electric capacity C5 ground connection and the transistor Q4 of grounded emitter form; The Same Name of Ends of the primary coil of described transformer T is connected with the tie point of electric capacity C5 with electric capacity C4, ground connection after its non-same polarity is then connected with the emitter of transistor Q4; Meanwhile, the emitter of transistor Q4 is also connected with the TS pin of driving chip M, and the secondary coil of described transformer T is provided with tap Y1 and tap Y2; The grid of described field effect transistor MOS1 is connected with the Same Name of Ends of secondary coil, the grid of field effect transistor MOS4 is connected with the non-same polarity of secondary coil, the grid of field effect transistor MOS2 is connected with tap Y1, and the grid of field effect transistor MOS3 is then connected with tap Y2.
Described switched current source is by transistor Q1, transistor Q2, transistor Q3, DC power supply S, be serially connected in the resistance R1 between the collector electrode of transistor Q1 and the collector electrode of transistor Q2, be serially connected in the RC filter circuit between the emitter of transistor Q1 and the negative pole of DC power supply S, be serially connected in the resistance R2 between the base stage of transistor Q1 and the negative pole of DC power supply S, the resistance R5 in parallel with DC power supply S-phase, be serially connected in the resistance R6 between the emitter of transistor Q3 and the negative pole of DC power supply S, be serially connected in the resistance R4 between the collector electrode of transistor Q3 and the collector electrode of transistor Q2, and positive pole is connected with the collector electrode of transistor Q2, the polar capacitor C2 that negative pole is connected with the negative pole of DC power supply S forms, the base stage of described transistor Q2 is also connected with the collector electrode of transistor Q1, and the base stage of transistor Q3 is then connected with the positive pole of DC power supply S with the emitter of transistor Q2 respectively, the VCC pin of described driving chip M is connected with the positive pole of polar capacitor C2, and the INP pin of driving chip M is then connected with the negative pole of polar capacitor C2.
Described logic control circuit is by NAND gate IC4, the not gate IC5 that input is connected with the output of NAND gate IC4, the not gate IC3 that output is connected with the negative input of NAND gate IC4, and the first logical links be connected with the electrode input end of NAND gate IC4 and the second logical links form.
Described first logical links is by not gate IC1, the not gate IC2 that the output of input NAND gate IC1 is connected, output is connected with the electrode input end of NAND gate IC4 in turn after resistance R11, diode D4, the filter delay circuit be connected with the electrode input end of NAND gate IC4, the input of P pole NAND gate IC1 is connected, N pole in turn through the diode D2 that the input of resistance R9 NAND gate IC1 after electric capacity C6 is connected, and forms with the resistance R8 that diode D2 is in parallel; The tie point ground connection of described electric capacity C6 and resistance R9, the N pole of diode D2 is connected with the output of power amplifier P1, and the output of not gate IC2 is then all connected with the output of power amplifier P2 with the output of not gate IC5.
The second described logical links is by XOR gate IC6, the diode D5 that P pole is connected with the electrode input end of NAND gate IC4, N pole is connected with the first input end of XOR gate IC6, the diode D3 that the input of N pole NAND gate IC3 is connected, P pole is connected with the output of pulse comparator U1, the resistance R10 be in parallel with diode D3, positive pole is connected with the N pole of diode D3, the electric capacity C7 of minus earth, and the diode D6 that N pole is connected with the first input end of XOR gate IC6, P pole is connected with the output of pulse comparator U1 forms; The output of the second input NAND gate IC5 of described XOR gate IC6 is connected, and the output of XOR gate IC6 is then connected with the output of pulse comparator U2.
Described filter delay circuit is by electrochemical capacitor C8, and the resistance R12 be serially connected between the positive pole of electrochemical capacitor C8 and negative pole forms; The N pole of described diode D4 is then connected with the positive pole of this electrochemical capacitor C8.
For guaranteeing result of use, described driving chip M is LTC4440A integrated chip.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention not only has the function of short-circuit protection, overvoltage protection and open-circuit-protection, and its power consumption is lower, is only 1/3 of conventional protection circuit power consumption.
(2) the present invention is provided with switched current source, therefore can guarantee the need for electricity of protective circuit self, effectively can avoid external electromagnetic interference, improves the sensitivity and precision that control.
(3) the present invention adopts LTC4440A integrated chip to be used as driving chip, can forbid the startup of outside field effect transistor, thus guarantees the present invention not by the interference of external power source.
(4) the present invention also has undervoltage lockout function, effectively can overcome the late effect of conventional protection circuit.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is grid electrode drive circuit structure schematic diagram of the present invention.
Fig. 3 is logic control circuit structural representation of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1; blue LED lamp protection system of the present invention is primarily of gate driver circuit; logic control circuit; oscillator; power amplifier P1, power amplifier P2, pulse comparator U1; pulse comparator U2, and field effect transistor MOS1, field effect transistor MOS2, field effect transistor MOS3 and field effect transistor MOS4 composition.
During connection, the output of the output of power amplifier P1, the output of power amplifier P2 and pulse comparator U1 is connected with the equal andlogic control circuit of the output of pulse comparator U2, two outputs of oscillator are then connected with the negative input of pulse comparator U2 with the negative input of pulse comparator U1 respectively, to guarantee that this oscillator can provide PWM wide pulse signal for pulse comparator U1 and pulse comparator U2.
Meanwhile, the source electrode of this field effect transistor MOS1 is connected with the electrode input end of pulse comparator U1, and its drain electrode is then connected with the source electrode of field effect transistor MOS2; The source electrode of field effect transistor MOS3 is connected with the electrode input end of pulse comparator U2, and its drain electrode is then connected with the source electrode of field effect transistor MOS4; The grid of described field effect transistor MOS2 is also connected with the electrode input end of power amplifier P1, its grounded drain; The grid of described field effect transistor MOS4 is also connected with the electrode input end of power amplifier P2, its grounded drain; And the equal ground connection of the negative input of the negative input of power amplifier P1 and power amplifier P2.
Wherein, the tie point of the tie point of field effect transistor MOS1 and field effect transistor MOS2 and field effect transistor MOS3 and field effect transistor MOS4 jointly as output of the present invention, for being connected with the LED or other LED drive system of outside.
Described gate driver circuit is used for providing driving voltage to field effect transistor MOS1, field effect transistor MOS2, field effect transistor MOS3 and field effect transistor MOS4 and controlling drive singal, as described in Figure 2, namely it is made up of transistor Q4, transformer T, driving chip M, switched current source, diode D1, electric capacity C3, resistance R7, electric capacity C4 and electric capacity C5 its structure.During connection, switched current source needs to be serially connected with between the VCC pin of driving chip M and INP pin, and diode D1 is serially connected with between the VCC pin of driving chip M and BOOST pin, electric capacity C3 is serially connected with between the BOOST pin of driving chip M and TG pin, and resistance R7 is then serially connected with between the TG pin of driving chip M and TS pin.
The base stage of described transistor Q4 is connected with the TG pin of driving chip M, and its collector electrode is ground connection after electric capacity C4 and electric capacity C5 in turn, its grounded emitter.Meanwhile, the collector electrode of this transistor Q4 also needs the driving voltage of external+6V, to guarantee that transistor Q4 can normally run.
Wherein, the Same Name of Ends of the primary coil of transformer T is connected with the tie point of electric capacity C5 with electric capacity C4, ground connection after its non-same polarity is then connected with the emitter of transistor Q4.Meanwhile, the emitter of transistor Q4 is also connected with the TS pin of driving chip M.
The secondary coil of transformer T is provided with tap Y1 and tap Y2, and namely by this tap Y1 and tap Y2, the present invention is formed with 4 outputs, the i.e. Same Name of Ends of secondary coil on the secondary coil of transformer T, the non-same polarity of Y1 tap, Y2 tap and secondary coil.When connecting, the grid of field effect transistor MOS1 is connected with the Same Name of Ends of secondary coil, the grid of field effect transistor MOS4 is connected with the non-same polarity of secondary coil, and the grid of field effect transistor MOS2 is connected with tap Y1, and the grid of field effect transistor MOS3 is then connected with tap Y2.
Switched current source is used for providing working power to driving chip M, it is by transistor Q1, transistor Q2, transistor Q3, DC power supply S, be serially connected in the resistance R1 between the collector electrode of transistor Q1 and the collector electrode of transistor Q2, be serially connected in the RC filter circuit between the emitter of transistor Q1 and the negative pole of DC power supply S, be serially connected in the resistance R2 between the base stage of transistor Q1 and the negative pole of DC power supply S, the resistance R5 in parallel with DC power supply S-phase, be serially connected in the resistance R6 between the emitter of transistor Q3 and the negative pole of DC power supply S, be serially connected in the resistance R4 between the collector electrode of transistor Q3 and the collector electrode of transistor Q2, and positive pole is connected with the collector electrode of transistor Q2, the polar capacitor C2 that negative pole is connected with the negative pole of DC power supply S forms.
Meanwhile, the base stage of this transistor Q2 is also connected with the collector electrode of transistor Q1, and the base stage of transistor Q3 is then connected with the positive pole of DC power supply S with the emitter of transistor Q2 respectively; The VCC pin of described driving chip M is connected with the positive pole of polar capacitor C2, and the INP pin of driving chip M is then connected with the negative pole of polar capacitor C2.
For guaranteeing result of use, the high-frequency N-channel MOS FET grid drive chip that this driving chip M preferentially adopts Linear Techn Inc. to produce, i.e. LTC4440A integrated chip.This driving chip can with the input voltage work up to 80V, up to can continuous operation during 100V transient state.
The structure of logic control circuit as shown in Figure 3, it is by NAND gate IC4, the not gate IC5 that input is connected with the output of NAND gate IC4, the not gate IC3 that output is connected with the negative input of NAND gate IC4, and the first logical links be connected with the electrode input end of NAND gate IC4 and the second logical links form.
Wherein, this first logical links is made up of not gate IC1, not gate IC2, resistance R11, diode D4, filter delay circuit, resistance R8, resistance R9, electric capacity C6 and diode D2.During connection, the output of the input NAND gate IC1 of not gate IC2 is connected, and its output is then connected with the electrode input end of NAND gate IC4 after diode D4 through resistance R11 in turn.Meanwhile, filter delay circuit will be connected with the electrode input end of NAND gate IC4.
The input of the P pole NAND gate IC1 of diode D2 is connected, its N pole is connected through the input of resistance R9 NAND gate IC1 after electric capacity C6 in turn, namely needs in turn to form an electric loop with the P pole of diode D2 after resistance R9 and electric capacity C6 from the N pole of diode D2.Resistance R8 is then in parallel with diode D2.Meanwhile, the tie point ground connection of described electric capacity C6 and resistance R9, the N pole of diode D2 needs to be connected with the output of power amplifier P1, and the output of not gate IC2 is then all connected with the output of power amplifier P2 with the output of not gate IC5.
Described filter delay circuit is by electrochemical capacitor C8, and the resistance R12 be serially connected between the positive pole of electrochemical capacitor C8 and negative pole forms, during connection, the N pole of diode D4 will be connected with the positive pole of this electrochemical capacitor C8, and namely the electrode input end of NAND gate IC4 will be connected with the positive pole of electrochemical capacitor C8.
The second described logical links is made up of XOR gate IC6, diode D5, diode D6, diode D3, resistance R10 and electric capacity C7.During connection, the P pole of diode D5 is connected with the electrode input end of NAND gate IC4, and its N pole is connected with the first input end of XOR gate IC6.The input of the N pole NAND gate IC3 of diode D3 is connected, and its P pole is connected with the output of pulse comparator U1; Resistance R10 is then in parallel with diode D3.
The positive pole of electric capacity C7 is connected with the N pole of diode D3, its minus earth; The N pole of diode D6 is connected with the first input end of XOR gate IC6, and its P pole is connected with the output of pulse comparator U1.Meanwhile, the output of the second input NAND gate IC5 of XOR gate IC6 is connected, and the output of XOR gate IC6 is then connected with the output of pulse comparator U2.
As mentioned above, just the present invention can well be realized.
Claims (6)
1. a blue LED lamp protection system, it is characterized in that, primarily of gate driver circuit, logic control circuit, the power amplifier P1 that andlogic control circuit is connected and power amplifier P2, the pulse comparator U1 that andlogic control circuit is connected and pulse comparator U2, the field effect transistor MOS1 that grid is all connected with gate driver circuit, field effect transistor MOS2, field effect transistor MOS3 and field effect transistor MOS4, and be serially connected in the oscillator composition between the negative input of pulse comparator U1 and the negative input of pulse comparator U2; The source electrode of described field effect transistor MOS1 is connected with the electrode input end of pulse comparator U1, and its drain electrode is then connected with the source electrode of field effect transistor MOS2; The source electrode of field effect transistor MOS3 is connected with the electrode input end of pulse comparator U2, and its drain electrode is then connected with the source electrode of field effect transistor MOS4; The grid of described field effect transistor MOS2 is also connected with the electrode input end of power amplifier P1, its grounded drain; The grid of described field effect transistor MOS4 is also connected with the electrode input end of power amplifier P2, its grounded drain; The equal ground connection of negative input of described power amplifier P1 and power amplifier P2.
2. a kind of blue LED lamp protection system according to claim 1, it is characterized in that, described gate driver circuit is by transformer T, driving chip M, be serially connected with the switched current source between the VCC pin of driving chip M and INP pin, be serially connected with the diode D1 between the VCC pin of driving chip M and BOOST pin, be serially connected with the electric capacity C3 between the BOOST pin of driving chip M and TG pin, be serially connected with the resistance R7 between the TG pin of driving chip M and TS pin, and base stage is connected with the TG pin of driving chip M, collector electrode is ground connection after electric capacity C4 and electric capacity C5 in turn, and the transistor Q4 of grounded emitter forms, the Same Name of Ends of the primary coil of described transformer T is connected with the tie point of electric capacity C5 with electric capacity C4, ground connection after its non-same polarity is then connected with the emitter of transistor Q4, meanwhile, the emitter of transistor Q4 is also connected with the TS pin of driving chip M, and the secondary coil of described transformer T is provided with tap Y1 and tap Y2, the grid of described field effect transistor MOS1 is connected with the Same Name of Ends of secondary coil, the grid of field effect transistor MOS4 is connected with the non-same polarity of secondary coil, the grid of field effect transistor MOS2 is connected with tap Y1, and the grid of field effect transistor MOS3 is then connected with tap Y2.
3. a kind of blue LED lamp protection system according to claim 2, it is characterized in that, described switched current source is by transistor Q1, transistor Q2, transistor Q3, DC power supply S, be serially connected in the resistance R1 between the collector electrode of transistor Q1 and the collector electrode of transistor Q2, be serially connected in the RC filter circuit between the emitter of transistor Q1 and the negative pole of DC power supply S, be serially connected in the resistance R2 between the base stage of transistor Q1 and the negative pole of DC power supply S, the resistance R5 in parallel with DC power supply S-phase, be serially connected in the resistance R6 between the emitter of transistor Q3 and the negative pole of DC power supply S, be serially connected in the resistance R4 between the collector electrode of transistor Q3 and the collector electrode of transistor Q2, and positive pole is connected with the collector electrode of transistor Q2, the polar capacitor C2 that negative pole is connected with the negative pole of DC power supply S forms, the base stage of described transistor Q2 is also connected with the collector electrode of transistor Q1, and the base stage of transistor Q3 is then connected with the positive pole of DC power supply S with the emitter of transistor Q2 respectively, the VCC pin of described driving chip M is connected with the positive pole of polar capacitor C2, and the INP pin of driving chip M is then connected with the negative pole of polar capacitor C2.
4. a kind of blue LED lamp protection system according to any one of claims 1 to 3, it is characterized in that, described logic control circuit is by NAND gate IC4, the not gate IC5 that input is connected with the output of NAND gate IC4, the not gate IC3 that output is connected with the negative input of NAND gate IC4, and the first logical links be connected with the electrode input end of NAND gate IC4 and the second logical links form;
Described first logical links is by not gate IC1, the not gate IC2 that the output of input NAND gate IC1 is connected, output is connected with the electrode input end of NAND gate IC4 in turn after resistance R11, diode D4, the filter delay circuit be connected with the electrode input end of NAND gate IC4, the input of P pole NAND gate IC1 is connected, N pole in turn through the diode D2 that the input of resistance R9 NAND gate IC1 after electric capacity C6 is connected, and forms with the resistance R8 that diode D2 is in parallel; The tie point ground connection of described electric capacity C6 and resistance R9, the N pole of diode D2 is connected with the output of power amplifier P1, and the output of not gate IC2 is then all connected with the output of power amplifier P2 with the output of not gate IC5;
The second described logical links is by XOR gate IC6, the diode D5 that P pole is connected with the electrode input end of NAND gate IC4, N pole is connected with the first input end of XOR gate IC6, the diode D3 that the input of N pole NAND gate IC3 is connected, P pole is connected with the output of pulse comparator U1, the resistance R10 be in parallel with diode D3, positive pole is connected with the N pole of diode D3, the electric capacity C7 of minus earth, and the diode D6 that N pole is connected with the first input end of XOR gate IC6, P pole is connected with the output of pulse comparator U1 forms; The output of the second input NAND gate IC5 of described XOR gate IC6 is connected, and the output of XOR gate IC6 is then connected with the output of pulse comparator U2.
5. a kind of blue LED lamp protection system according to claim 4, is characterized in that, described filter delay circuit is by electrochemical capacitor C8, and the resistance R12 be serially connected between the positive pole of electrochemical capacitor C8 and negative pole forms; The N pole of described diode D4 is then connected with the positive pole of this electrochemical capacitor C8.
6. a kind of blue LED lamp protection system according to Claims 2 or 3, is characterized in that, described driving chip M is LTC4440A integrated chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410675375.8A CN104470083A (en) | 2014-11-22 | 2014-11-22 | Protection system for blue-light LED lamp |
| CN201510324269.XA CN104968089A (en) | 2014-11-22 | 2015-06-13 | Blue LED lamp protection system based on half-bridge drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410675375.8A CN104470083A (en) | 2014-11-22 | 2014-11-22 | Protection system for blue-light LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104470083A true CN104470083A (en) | 2015-03-25 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410675375.8A Pending CN104470083A (en) | 2014-11-22 | 2014-11-22 | Protection system for blue-light LED lamp |
| CN201510324269.XA Pending CN104968089A (en) | 2014-11-22 | 2015-06-13 | Blue LED lamp protection system based on half-bridge drive circuit |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510324269.XA Pending CN104968089A (en) | 2014-11-22 | 2015-06-13 | Blue LED lamp protection system based on half-bridge drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN104470083A (en) |
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2014
- 2014-11-22 CN CN201410675375.8A patent/CN104470083A/en active Pending
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2015
- 2015-06-13 CN CN201510324269.XA patent/CN104968089A/en active Pending
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| CN104968089A (en) | 2015-10-07 |
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Application publication date: 20150325 |