CN105979658A - Overvoltage protection white light LED (Light-Emitting Diode) boost conversion system based on frequency compensating circuit - Google Patents
Overvoltage protection white light LED (Light-Emitting Diode) boost conversion system based on frequency compensating circuit Download PDFInfo
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- CN105979658A CN105979658A CN201610463861.2A CN201610463861A CN105979658A CN 105979658 A CN105979658 A CN 105979658A CN 201610463861 A CN201610463861 A CN 201610463861A CN 105979658 A CN105979658 A CN 105979658A
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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
- H05B45/37—Converter circuits
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses an overvoltage protection white light LED (Light-Emitting Diode) boost conversion system based on a frequency compensating circuit. The overvoltage protection white light LED boost conversion system is characterized by mainly consisting of a processing chip U, a diode D1, a field effect transistor MOS (Metal Oxide Semiconductor), a frequency compensating circuit and a constant-current output circuit, wherein the frequency compensating circuit is connected with an L pin of the processing chip U; and the constant-current output circuit is connected with a VOUT pin of the processing chip U. In the boost conversion system, a TPS61200 integrated chip is creatively combined with a novel peripheral circuit, so that constant current can be output; constant-current driving is provided for a white light LED; brightness change of the white light LED caused by voltage change is avoided; and the brightness of a plurality of white light LEDs is kept consistent. The overvoltage protection white light LED boost conversion system can be shut down automatically under overvoltage, so that the white light LED is protected from being damaged by the overvoltage. Meanwhile, the phenomenon of oscillation in the system can be avoided, and the stability of the overvoltage protection white light LED boost conversion system is enhanced greatly.
Description
Technical field
The present invention relates to domain of control temperature, specifically refer to a kind of overpressure-proof type based on frequency compensated circuit
White light LEDs boost conversion system.
Background technology
At present, portable product is widely used color LCD display, and with white light LEDs as backlight.
In order to make white light LEDs work, typically now using boost conversion system is power white LEDs.But, existing
Some boost conversion systems cannot export constant electric current, i.e. cannot provide constant-current driving to white light LEDs, from
And cause the brightness of white light LEDs to change when cell voltage changes, or between multiple white light LEDs
Brightness is not mated.
Summary of the invention
It is an object of the invention to overcome existing boost conversion system cannot export constant electric current
Defect, it is provided that a kind of overpressure-proof type white light LEDs boost conversion system based on frequency compensated circuit.
The purpose of the present invention is achieved through the following technical solutions: overpressure-proof type based on frequency compensated circuit is white
Light LED boost conversion system, mainly by processing chip U, diode D1, field effect transistor MOS, with place
The frequency compensated circuit that the L pin of reason chip U is connected, is connected with the VOUT pin processing chip U
Constant current output circuit, one end is connected with the N pole of diode D1, the other end after resistance R5 with field imitate
Should the inductance L1 that is connected of the drain electrode of pipe MOS, positive pole is connected with the N pole of diode D1, negative pole warp
The electric capacity C2 that after resistance R2, junction point with inductance L1 and resistance R5 is connected, is serially connected in process chip U
VAUX pin and the grid of field effect transistor MOS between resistance R3, positive pole and field effect transistor MOS
Source electrode be connected, the electric capacity C3 of minus earth, one end with process chip U PGND pin be connected,
The resistance R4 of other end ground connection, one end with process chip U VIN pin be connected, the other end then with two poles
The P pole of pipe D1 is collectively forming the resistance R1 of input, and positive pole is connected with frequency compensated circuit after inductance L2
Connect, negative pole then with the electric capacity C1 that is connected of PS pin processing chip U, and be serially connected in inductance L1 and electricity
Overvoltage crowbar composition between junction point and the constant current output circuit of resistance R5；Described process chip U's
FB pin is connected with constant current output circuit, its GND pin ground connection, its EN pin and UVLO pin
All positive poles with electric capacity C1 are connected.
Further, described frequency compensated circuit is by amplifier P1, amplifier P2, audion VT5, three poles
Pipe VT6, N pole base stage with audion VT5 after resistance R16 is connected, P pole is as this frequency compensation
The diode D7 of the input of circuit, be serially connected in the N pole of diode D7 and audion VT5 emitter stage it
Between resistance R15, N pole outfan with amplifier P2 after resistance R19 be connected, P pole is through resistance R17
Diode D9, the N pole that emitter stage with audion VT5 is connected afterwards is connected with the P pole of diode D9,
The diode D8 that P pole is connected with the outfan of amplifier P1, be serially connected in audion VT5 colelctor electrode and
Resistance R18 between the emitter stage of audion VT6, positive pole is connected with the negative pole of amplifier P1, negative pole with
The electric capacity C7 that the negative pole of amplifier P2 is connected, and positive pole is connected with the base stage of audion VT6, negative
The electric capacity C8 composition that pole is connected with the N pole of diode D9；The colelctor electrode of described audion VT5 with put
The positive pole of big device P1 is connected；The colelctor electrode of described audion VT6 is connected with the P pole of diode D9,
Emitter stage is connected with the positive pole of amplifier P2；The outfan of described amplifier P2 is as this frequency compensation electricity
The outfan on road is also connected with the L pin processing chip U；The input of described frequency compensated circuit then warp
After inductance L2, the positive pole with electric capacity C1 is connected.
Described overvoltage crowbar is by the base stage of audion VT3, audion VT4, negative pole and audion VT3
Be connected, positive pole as the electric capacity C4 of the input of this overvoltage crowbar, the collection of positive pole and audion VT3
The electric capacity C5 that electrode is connected, negative pole is connected with the base stage of audion VT3, is serially connected in audion VT3
Colelctor electrode and the emitter stage of audion VT4 between the emitter stage of resistance R13, N pole and audion VT4
Be connected, diode D5 that P pole base stage with audion VT3 after resistance R10 is connected, be serially connected in three
Resistance R12 between colelctor electrode and the P pole of diode D5 of pole pipe VT3, is serially connected in audion VT3's
Resistance R11 between the P pole of emitter stage and diode D5, positive pole is connected with the base stage of audion VT4,
Electric capacity C6, the N pole that negative pole is connected with the P pole of diode D5 is connected with the base stage of audion VT4,
The diode D6 that P pole is connected with the P pole of diode D5, and the colelctor electrode of one end and audion VT4
Be connected, the other end forms as the resistance R14 of the outfan of this overvoltage crowbar；Described diode D5
P pole ground connection；The input of described overvoltage crowbar is connected with the junction point of resistance R5 and inductance L1,
Its outfan is then connected with constant current output circuit.
Described constant current output circuit is by audion VT1, audion VT2, amplifier P, P pole and process chip
Diode D2, the N pole that the VOUT pin of U is connected, N pole is connected with the base stage of audion VT1
Be connected with the negative pole of amplifier P, the diode D3 of P pole ground connection, the transmitting phase of one end and audion VT1
The resistance R6 that connection, the other end are connected with the P pole of diode D3 after resistance R7, is serially connected in audion
Resistance R9 between emitter stage and the positive pole of amplifier P of VT2, the colelctor electrode phase of one end and audion VT2
Connect, the resistance R8 that is then connected with the outfan of overvoltage crowbar of the other end, and P pole and audion
The diode D4 composition that the colelctor electrode of VT2 is connected, N pole is connected with the outfan of amplifier P；Described
The junction point of resistance R6 and resistance R7 is connected with the FB pin processing chip U；Described audion VT1
Colelctor electrode be connected with the base stage of audion VT2.
Described process chip U is the integrated chip of TPS61200.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) the employing integrated chip of TPS61200 of present invention original creation combines with novel peripheral circuit, thus
Guarantee that the present invention can export constant electric current, for white light LEDs provide constant-current driving, it is to avoid change in voltage and
Cause the brightness flop of white light LEDs, make the brightness between multiple white light LEDs consistent.
(2) present invention can disconnect automatically when there is overvoltage, thus protects white light LEDs not by overvoltage
Damage.
(3) present invention can oscillatory occurences present in elimination system, greatly improve stablizing of the present invention
Property.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the overvoltage crowbar of the present invention.
Fig. 3 is the structure chart of the frequency compensated circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by processing chip U, constant current output circuit, overvoltage crowbar,
Frequency compensated circuit, diode D1, field effect transistor MOS, resistance R1, resistance R2, resistance R3, electricity
Resistance R4, resistance R5, electric capacity C1, electric capacity C2, electric capacity C3, inductance L1 and inductance L2 composition.
Wherein, constant current output circuit is connected with the VAUX pin processing chip U.Frequency compensated circuit is then
It is connected with the L pin processing chip U.One end of inductance L1 is connected with the N pole of diode D1, it
Other end drain electrode with field effect transistor MOS after resistance R5 is connected.Overvoltage crowbar is then serially connected in electricity
Between resistance R5 and the junction point of inductance L1 and constant current output circuit.The positive pole of electric capacity C2 is with diode D1's
N pole is connected, its negative pole junction point with inductance L1 and resistance R5 after resistance R2 is connected.Resistance
R3 is serially connected between VAUX pin and the grid of field effect transistor MOS processing chip U.Electric capacity C3's
Positive pole is connected with the source electrode of field effect transistor MOS, its minus earth.One end of resistance R4 and process chip
The PGND pin of U is connected, its other end ground connection.One end of resistance R1 and the VIN processing chip U
Pin is connected, its other end then P pole with diode D1 is collectively forming input.The positive pole of electric capacity C1
Be connected with frequency compensated circuit after inductance L2, its negative pole is then connected with the PS pin processing chip U.
Meanwhile, the FB pin of described process chip U is connected with constant current output circuit, its GND pin connects
All positive poles with electric capacity C1 are connected with UVLO pin for ground, its EN pin.Described constant current output circuit is also
It is connected with the junction point of resistance R5 and inductance L1.In order to preferably implement process chip U of the present invention
The integrated chip of preferably TPS61200.
It addition, described constant current output circuit is by audion VT1, audion VT2, amplifier P, diode
D2, diode D3, diode D4, resistance R6, resistance R7, resistance R8 and resistance R9 form.
During connection, the P pole of diode D2 with process chip U VOUT pin be connected, its N pole with
The base stage of audion VT1 is connected.The N pole of diode D3 is connected with the negative pole of amplifier P, its P
Pole ground connection.One end of resistance R6 is connected with the transmitting of audion VT1, its other end after resistance R7 with
The P pole of diode D3 is connected.Resistance R9 is just being serially connected in the emitter stage of audion VT2 and amplifier P
Between pole.One end of resistance R8 is connected with the colelctor electrode of audion VT2, its other end is then protected with overvoltage
The outfan of protection circuit is connected.The P pole of diode D4 is connected with the colelctor electrode of audion VT2, it
N pole is connected with the outfan of amplifier P.
The junction point of this resistance R6 and resistance R7 is connected with the FB pin processing chip U.Described three poles
The colelctor electrode of pipe VT1 is connected with the base stage of audion VT2.
As in figure 2 it is shown, this overvoltage crowbar is by audion VT3, audion VT4, resistance R10, electricity
Resistance R11, resistance R12, resistance R13, resistance R14, electric capacity C4, electric capacity C5, electric capacity C6, two poles
Pipe D5 and diode D6 composition.
During connection, the negative pole of electric capacity C4 is connected with the base stage of audion VT3, its positive pole is as this overvoltage
The input of protection circuit is also connected with the junction point of resistance R5 and inductance L1.The positive pole of electric capacity C5 with
The colelctor electrode of audion VT3 is connected, its negative pole is connected with the base stage of audion VT3.Resistance R13
It is serially connected between the colelctor electrode of audion VT3 and the emitter stage of audion VT4.The N pole of diode D5 with
The emitter stage of audion VT4 is connected, its P pole base stage with audion VT3 after resistance R10 is connected.
Resistance R12 is serially connected between the colelctor electrode of audion VT3 and the P pole of diode D5.Resistance R11 concatenates
Between the emitter stage and the P pole of diode D5 of audion VT3.The positive pole of electric capacity C6 and audion VT4
Base stage be connected, its negative pole is connected with the P pole of diode D5.The N pole of diode D6 and audion
The base stage of VT4 is connected, its P pole is connected with the P pole of diode D5.One end of resistance R14 and three
The colelctor electrode of pole pipe VT4 is connected, its other end is as the outfan of this overvoltage crowbar and through resistance R8
Colelctor electrode with audion VT2 is connected afterwards.The P pole ground connection of described diode D5.Described amplifier P
The junction point of outfan and resistance R8 and resistance R14 be collectively forming outfan.
As it is shown on figure 3, described frequency compensated circuit is by amplifier P1, amplifier P2, audion VT5, three
Pole pipe VT6, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, diode D7,
Diode D8, diode D9, electric capacity C7 and electric capacity C8 form.
During connection, the N pole of diode D7 base stage with audion VT5 after resistance R16 is connected, it
P pole as the input of this frequency compensated circuit and after inductance L2 positive pole with electric capacity C1 be connected.Electricity
Resistance R15 is serially connected between the N pole of diode D7 and the emitter stage of audion VT5.The N of diode D9
Pole outfan with amplifier P2 after resistance R19 is connected, its P pole after resistance R17 with audion
The emitter stage of VT5 is connected.The N pole of diode D8 is connected with the P pole of diode D9, its P pole with
The outfan of amplifier P1 is connected.Resistance R18 is serially connected in colelctor electrode and the audion VT6 of audion VT5
Emitter stage between.The positive pole of electric capacity C7 is connected with the negative pole of amplifier P1, its negative pole and amplifier P2
Negative pole be connected.The positive pole of electric capacity C8 is connected with the base stage of audion VT6, its negative pole and diode
The N pole of D9 is connected.
The colelctor electrode of described audion VT5 is connected with the positive pole of amplifier P1.Described audion VT6's
Colelctor electrode is connected with the P pole of diode D9, emitter stage is connected with the positive pole of amplifier P2.Described put
The outfan of big device P2 as the outfan of this frequency compensated circuit and is connected with the L pin processing chip U
Connect.
The employing integrated chip of TPS61200 of present invention original creation combines with novel peripheral circuit, so that it is guaranteed that
The present invention can export constant electric current, for white light LEDs provide constant-current driving, it is to avoid change in voltage and cause
The brightness flop of white light LEDs, makes the brightness between multiple white light LEDs consistent.The present invention can occur
Automatically disconnect during voltage, thus protect white light LEDs not damaged by overvoltage.Meanwhile, the present invention can eliminate
Oscillatory occurences present in system, greatly improves the stability of the present invention.
As it has been described above, just can well realize the present invention.
Claims (5)
1. overpressure-proof type white light LEDs boost conversion system based on frequency compensated circuit, it is characterised in that
Mainly by processing chip U, diode D1, field effect transistor MOS, it is connected with the L pin processing chip U
The frequency compensated circuit connect, the constant current output circuit being connected with the VOUT pin processing chip U, one end
Be connected with the N pole of diode D1, other end drain electrode with field effect transistor MOS after resistance R5 is connected
The inductance L1 connect, positive pole is connected with the N pole of diode D1, negative pole after resistance R2 with inductance L1 and
The electric capacity C2 that the junction point of resistance R5 is connected, is serially connected in VAUX pin and the field effect processing chip U
Resistance R3 between the grid of pipe MOS, positive pole is connected with the source electrode of field effect transistor MOS, minus earth
Electric capacity C3, one end with process chip U PGND pin be connected, the resistance R4 of other end ground connection,
One end is connected with the VIN pin processing chip U, the other end then P pole with diode D1 is collectively forming
The resistance R1 of input, positive pole is connected with frequency compensated circuit after inductance L2, negative pole then with process core
The electric capacity C1 that the PS pin of sheet U is connected, and it is serially connected in inductance L1 and the junction point of resistance R5 and perseverance
Overvoltage crowbar composition between stream output circuit；The FB pin of described process chip U and constant current output
Circuit is connected, its GND pin ground connection, its EN pin and UVLO pin all with the positive pole of electric capacity C1
It is connected.
Overpressure-proof type white light LEDs based on frequency compensated circuit the most according to claim 1 boosts
Converting system, it is characterised in that described frequency compensated circuit is by amplifier P1, amplifier P2, audion
VT5, audion VT6, N pole base stage with audion VT5 after resistance R16 is connected, the conduct of P pole
The diode D7 of the input of this frequency compensated circuit, is serially connected in N pole and the audion VT5 of diode D7
Emitter stage between resistance R15, N pole outfan with amplifier P2 after resistance R19 be connected, P
Diode D9, N pole that pole emitter stage with audion VT5 after resistance R17 is connected and diode D9
The diode D8 that P pole is connected, P pole is connected with the outfan of amplifier P1, be serially connected in audion
The negative pole of the resistance R18 between colelctor electrode and the emitter stage of audion VT6 of VT5, positive pole and amplifier P1
Be connected, electric capacity C7 that negative pole is connected with the negative pole of amplifier P2, and positive pole is with audion VT6's
The electric capacity C8 composition that base stage is connected, negative pole is connected with the N pole of diode D9；Described audion VT5
Colelctor electrode be connected with the positive pole of amplifier P1；The colelctor electrode of described audion VT6 is with diode D9's
P pole is connected, emitter stage is connected with the positive pole of amplifier P2；The outfan conduct of described amplifier P2
The outfan of this frequency compensated circuit is also connected with the L pin processing chip U；Described frequency compensated circuit
Input then after inductance L2 positive pole with electric capacity C1 be connected.
Overpressure-proof type white light LEDs based on frequency compensated circuit the most according to claim 2 boosts
Converting system, it is characterised in that described overvoltage crowbar is by audion VT3, audion VT4, negative pole
Be connected with the base stage of audion VT3, positive pole as the electric capacity C4 of the input of this overvoltage crowbar, just
The electric capacity C5 that pole is connected with the colelctor electrode of audion VT3, negative pole is connected with the base stage of audion VT3,
Resistance R13, the N pole and three being serially connected between the colelctor electrode of audion VT3 and the emitter stage of audion VT4
The emitter stage of pole pipe VT4 is connected, P pole base stage with audion VT3 after resistance R10 is connected two
Pole pipe D5, the resistance R12 being serially connected between the colelctor electrode of audion VT3 and the P pole of diode D5, string
The resistance R11 being connected between the emitter stage of audion VT3 and the P pole of diode D5, positive pole and audion
The base stage of VT4 is connected, negative pole is connected with the P pole of diode D5 electric capacity C6, N pole and audion
The diode D6 that the base stage of VT4 is connected, P pole is connected with the P pole of diode D5, and one end with
The colelctor electrode of audion VT4 is connected, the other end is as the resistance R14 of the outfan of this overvoltage crowbar
Composition；The P pole ground connection of described diode D5；The input of described overvoltage crowbar and resistance R5 and electricity
The junction point of sense L1 is connected, its outfan is then connected with constant current output circuit.
Overpressure-proof type white light LEDs based on frequency compensated circuit the most according to claim 3 boosts
Converting system, it is characterised in that described constant current output circuit, by audion VT1, audion VT2, amplifies
Device P, P pole is connected with the VOUT pin processing chip U, N pole is connected with the base stage of audion VT1
Diode D2, the N pole connect is connected with the negative pole of amplifier P, the diode D3 of P pole ground connection, one end with
The electricity that the transmitting of audion VT1 is connected, the other end is connected with the P pole of diode D3 after resistance R7
Resistance R6, the resistance R9 being serially connected between the emitter stage of audion VT2 and the positive pole of amplifier P, one end with
The resistance that the colelctor electrode of audion VT2 is connected, the other end is then connected with the outfan of overvoltage crowbar
R8, and P pole is connected with the colelctor electrode of audion VT2, N pole is connected with the outfan of amplifier P
Diode D4 composition；The junction point of described resistance R6 and resistance R7 and the FB pin processing chip U
It is connected；The colelctor electrode of described audion VT1 is connected with the base stage of audion VT2.
Overpressure-proof type white light LEDs based on frequency compensated circuit the most according to claim 4 boosts
Converting system, it is characterised in that described process chip U is the integrated chip of TPS61200.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610463861.2A CN105979658A (en) | 2016-06-23 | 2016-06-23 | Overvoltage protection white light LED (Light-Emitting Diode) boost conversion system based on frequency compensating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610463861.2A CN105979658A (en) | 2016-06-23 | 2016-06-23 | Overvoltage protection white light LED (Light-Emitting Diode) boost conversion system based on frequency compensating circuit |
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| Publication Number | Publication Date |
|---|---|
| CN105979658A true CN105979658A (en) | 2016-09-28 |
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ID=57022321
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610463861.2A Pending CN105979658A (en) | 2016-06-23 | 2016-06-23 | Overvoltage protection white light LED (Light-Emitting Diode) boost conversion system based on frequency compensating circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793269A (en) * | 2016-12-07 | 2017-05-31 | 横店集团得邦照明股份有限公司 | One kind compensation drive device and its implementation |
-
2016
- 2016-06-23 CN CN201610463861.2A patent/CN105979658A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793269A (en) * | 2016-12-07 | 2017-05-31 | 横店集团得邦照明股份有限公司 | One kind compensation drive device and its implementation |
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Application publication date: 20160928 |