CN105979651A - Frequency compensation circuit-based current protection-type white LED step-up conversion system - Google Patents
Frequency compensation circuit-based current protection-type white LED step-up conversion system Download PDFInfo
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- CN105979651A CN105979651A CN201610459701.0A CN201610459701A CN105979651A CN 105979651 A CN105979651 A CN 105979651A CN 201610459701 A CN201610459701 A CN 201610459701A CN 105979651 A CN105979651 A CN 105979651A
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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
-
- 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
-
- 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 a frequency compensation circuit-based current protection-type white LED step-up conversion system. The frequency compensation circuit-based current protection-type white LED step-up conversion system is characterized by mainly comprising a processing chip U, a diode D1, a field effect tube MOS, a frequency compensation circuit and a constant current output circuit, wherein the frequency compensation 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. A TPS61200 integrated chip is originally combined with a novel peripheral circuit, so that the condition that the frequency compensation circuit-based current protection-type white LED step-up conversion system can output constant current is ensured; constant current driving is provided for white LEDs; brightness changes of the white LEDs caused by a voltage change are avoided; a plurality of white LEDs are consistent in brightness; surge current generated at the power-on moment can be embedded within the permitted range; the constant current is output; and the white LEDs are prevented from being damaged by the surge current. Meanwhile, the oscillating phenomenon in the system can be eliminated; and the stability of the frequency compensation circuit-based current protection-type white LED step-up conversion system is greatly improved.
Description
Technical field
The present invention relates to domain of control temperature, specifically refer to a kind of current protection 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 mains voltage variations, 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 current protection 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: current protection 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
ICLC composition between junction point and the constant current output circuit of resistance R5；Described process chip U
FB pin be connected with constant current output circuit, its GND pin ground connection, its EN pin and UVLO pipe
Foot 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 D8 of the input of circuit, be serially connected in the N pole of diode D8 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 D10, the N pole that emitter stage with audion VT5 is connected afterwards is extremely connected with the P of diode D10
Connect, diode D9 that P pole is connected with the outfan of amplifier P1, be serially connected in the current collection of audion VT5
Resistance R18 between the emitter stage of pole and audion VT6, positive pole is connected with the negative pole of amplifier P1, bears
The electric capacity C6 that pole is connected with the negative pole of amplifier P2, and positive pole is connected with the base stage of audion VT6,
The electric capacity C7 composition that negative pole is connected with the N pole of diode D10；The colelctor electrode of described audion VT5 with
The positive pole of amplifier P1 is connected；The colelctor electrode of described audion VT6 is extremely connected with the P of diode D10
Connect, emitter stage is connected with the positive pole of amplifier P2；The outfan of described amplifier P2 is mended as this frequency
Repay the outfan of circuit and be connected with the L pin processing chip U；The input of described frequency compensated circuit
Then after inductance L2, positive pole with electric capacity C1 is connected.
Described ICLC, by audion VT3, audion VT4, field effect transistor MOS1, is born
Pole is connected with the base stage of audion VT3, positive pole after resistance R10 with the source electrode phase of field effect transistor MOS1
Connect electric capacity C4, negative pole is connected with the emitter stage of audion VT4, positive pole after resistance R11 with three poles
Electric capacity C5, the P pole that the colelctor electrode of pipe VT3 is connected after resistance R12 with the base stage phase of audion VT4
Connect, N pole is as the Zener diode D5 of the input of this ICLC, one end and audion
The colelctor electrode of VT4 is connected, the other end is connected with the source electrode of field effect transistor MOS1 after resistance R13
Resistance R14, P pole is connected with the junction point of resistance R13 and resistance R14, N pole and field effect transistor MOS1
The diode D6 that is connected of grid, and P pole is connected with the drain electrode of field effect transistor MOS1, N pole is made
Diode D7 composition for the outfan of this ICLC；The emitter stage of described audion VT3
It is connected with the source electrode of field effect transistor MOS1；The input of described ICLC and resistance R5
Be connected with the junction point of 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
The resistance R8 that connection, the other end are then connected with the outfan of ICLC, and P pole and three
The diode D4 composition that the colelctor electrode of pole pipe VT2 is connected, N pole is connected with the outfan of amplifier P；
The junction point of described resistance R6 and resistance R7 is connected with the FB pin processing chip U；Described audion
The colelctor electrode of VT1 is 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 be clamped in allowed limits and defeated for surge current produced by energising moment
Go out constant electric current, it is to avoid surge current damages white light LEDs.
(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 ICLC 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, surge current limits electricity
Road, frequency compensated circuit, diode D1, field effect transistor MOS, resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, electric capacity C1, electric capacity C2, electric capacity C3, inductance L1 and inductance L2 form.
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.ICLC then concatenates
Between resistance R5 and the junction point of inductance L1 and constant current output circuit.The positive pole of electric capacity C2 and diode
The N pole of D1 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
The positive pole of C3 is connected with the source electrode of field effect transistor MOS, its minus earth.One end of resistance R4 and process
The PGND pin of chip U is connected, its other end ground connection.One end of resistance R1 is with process chip U's
VIN pin is connected, its other end then P pole with diode D1 is collectively forming input.Electric capacity C1's
Positive pole is connected with frequency compensated circuit after inductance L2, its negative pole then with process chip U PS pin phase
Connect.
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 electric with surge
The outfan of stream limiting circuit is connected.The P pole of diode D4 is connected with the colelctor electrode of audion VT2,
Its 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, described ICLC is by audion VT3, audion VT4, field effect
Pipe MOS1, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, Zener diode
D5, diode D6, diode D7, electric capacity C4 and electric capacity C5 form.
Connect into, the negative pole of electric capacity C4 is connected with the base stage of audion VT3, its positive pole is through resistance R10
It is connected with the source electrode of field effect transistor MOS1 afterwards.The emitter stage phase of the negative pole of electric capacity C5 and audion VT4
Connect, its positive pole colelctor electrode with audion VT3 after resistance R11 is connected.Zener diode D5's
P pole base stage with audion VT4 after resistance R12 is connected, its N pole limits electricity as this surge current
The input on road is also connected with the junction point of resistance R5 and inductance L1.One end of resistance R14 and audion
The colelctor electrode of VT4 is connected, its other end source electrode with field effect transistor MOS1 after resistance R13 is connected.
The P pole of diode D6 is connected with the junction point of resistance R13 and resistance R14, its N pole and field effect transistor
The grid of MOS1 is connected.The P pole of diode D7 is connected with the drain electrode of field effect transistor MOS1, its N
Pole as the outfan of this ICLC and after resistance R8 with the colelctor electrode phase of audion VT2
Connect.The described emitter stage of audion VT3 is connected with the source electrode of field effect transistor MOS1.Described amplifier
The outfan of P is collectively forming the outfan of the present invention with the N pole of diode D7 and connects white light LEDs.
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 D8,
Diode D9, diode D10, electric capacity C6 and electric capacity C7 form.
During connection, the N pole of diode D8 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 D8 and the emitter stage of audion VT5.The N of diode D10
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 D9 is connected with the P pole of diode D10, its P pole
It is connected with the outfan of amplifier P1.Resistance R18 is serially connected in colelctor electrode and the audion of audion VT5
Between the emitter stage of VT6.The positive pole of electric capacity C6 is connected with the negative pole of amplifier P1, its negative pole and amplification
The negative pole of device P2 is connected.The positive pole of electric capacity C7 is connected with the base stage of audion VT6, its negative pole and two
The N pole of pole pipe D10 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 D10, 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 in energising wink
Surge current produced by between is clamped in allowed limits, and exports constant electric current, it is to avoid surge current
Damage white light LEDs.Meanwhile, the present invention can oscillatory occurences present in elimination system, greatly improve
The stability of the present invention.
As it has been described above, just can well realize the present invention.
Claims (5)
1. current protection 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 the junction point of inductance L1 and resistance R5 with permanent
ICLC 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 be all with electric capacity C1's
Positive pole is connected.
Current protection 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 D8 of the input of this frequency compensated circuit, is serially connected in N pole and the audion VT5 of diode D8
Emitter stage between resistance R15, N pole outfan with amplifier P2 after resistance R19 be connected, P
Diode D10, N pole that pole emitter stage with audion VT5 after resistance R17 is connected and diode D10
The diode D9 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 C6 that negative pole is connected with the negative pole of amplifier P2, and positive pole is with audion VT6's
The electric capacity C7 composition that base stage is connected, negative pole is connected with the N pole of diode D10；Described audion VT5
Colelctor electrode be connected with the positive pole of amplifier P1；The colelctor electrode of described audion VT6 and diode D10
P pole be connected, emitter stage is connected with the positive pole of amplifier P2；The outfan of described amplifier P2 is made
For the outfan of this frequency compensated circuit and it is connected with the L pin processing chip U；Described frequency compensation electricity
The input on road then after inductance L2 positive pole with electric capacity C1 be connected.
Current protection type white light LEDs based on frequency compensated circuit the most according to claim 2 boosts
Converting system, it is characterised in that described ICLC by audion VT3, audion VT4,
Field effect transistor MOS1, negative pole is connected with the base stage of audion VT3, positive pole is imitated with field after resistance R10
Should the electric capacity C4 that is connected of the source electrode of pipe MOS1, negative pole is connected with the emitter stage of audion VT4, positive pole
Electric capacity C5, the P pole that colelctor electrode with audion VT3 is connected after resistance R11 after resistance R12 with three
The base stage of pole pipe VT4 is connected, N pole is as the Zener diode of the input of this ICLC
D5, one end is connected with the colelctor electrode of audion VT4, the other end after resistance R13 with field effect transistor MOS1
Resistance R14, the P pole that is connected of source electrode be connected with the junction point of resistance R13 and resistance R14, N pole
The diode D6 being connected with the grid of field effect transistor MOS1, and the leakage of P pole and field effect transistor MOS1
Pole is connected, N pole forms as the diode D7 of the outfan of this ICLC；Described three poles
The emitter stage of pipe VT3 is connected with the source electrode of field effect transistor MOS1；Described ICLC defeated
Enter end be connected with the junction point of resistance R5 and inductance L1, its outfan is then connected with constant current output circuit.
Current protection 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 colelctor electrode of audion VT2 is connected, the other end is then connected with the outfan of ICLC
Resistance R8, and P pole is connected with the colelctor electrode of audion VT2, the outfan phase of N pole and amplifier P
The diode D4 composition connected；The junction point of described resistance R6 and resistance R7 and the FB processing chip U
Pin is connected；The colelctor electrode of described audion VT1 is connected with the base stage of audion VT2.
Current protection 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 |
|---|---|---|---|
| CN201610459701.0A CN105979651A (en) | 2016-06-23 | 2016-06-23 | Frequency compensation circuit-based current protection-type white LED step-up conversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610459701.0A CN105979651A (en) | 2016-06-23 | 2016-06-23 | Frequency compensation circuit-based current protection-type white LED step-up conversion system |
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| Publication Number | Publication Date |
|---|---|
| CN105979651A true CN105979651A (en) | 2016-09-28 |
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ID=57022217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610459701.0A Pending CN105979651A (en) | 2016-06-23 | 2016-06-23 | Frequency compensation circuit-based current protection-type white LED step-up conversion system |
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| CN (1) | CN105979651A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108668412A (en) * | 2018-06-14 | 2018-10-16 | 上汽大众汽车有限公司 | Meet the LED lamp areas the current feedback brightness BIN compensation circuit of vehicle body diagnosis |
-
2016
- 2016-06-23 CN CN201610459701.0A patent/CN105979651A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108668412A (en) * | 2018-06-14 | 2018-10-16 | 上汽大众汽车有限公司 | Meet the LED lamp areas the current feedback brightness BIN compensation circuit of vehicle body diagnosis |
| CN108668412B (en) * | 2018-06-14 | 2023-05-23 | 上汽大众汽车有限公司 | Current feedback type brightness BIN area compensation circuit for LED lamp meeting vehicle body diagnosis |
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Application publication date: 20160928 |
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