CN104918380A - Excitation type large-current boosting double-filtering LED (Light-Emitting Diode) constant switching stabilized voltage supply - Google Patents
Excitation type large-current boosting double-filtering LED (Light-Emitting Diode) constant switching stabilized voltage supply Download PDFInfo
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Abstract
The invention discloses an excitation type large-current boosting double-filtering LED (Light-Emitting Diode) constant switching stabilized voltage supply. The LED constant switching stabilized voltage supply mainly consists of a diode rectifier U, a power amplifier P1, a transformer T, a voltage comparator U1, a switching filter circuit, a power output circuit, a transformation feedback circuit, a nonlinear negative feedback circuit, a current detection amplifier circuit and the like, wherein the input end of the current detection amplifier is connected with the cathode output end of the diode rectifier U, and the output end of the current detection amplifier is connected with an IN-port of the voltage comparator U1. Clutters can be filtered, the circuit voltage can also be promoted, the accuracy and stability of circuit judgment and operation are improved, current detection is also realized by adopting the current detection amplifier circuit, and the bearing current of the switching power supply can be effectively improved, so that the application range is wider.
Description
Technical field
The present invention relates to a kind of switching power supply, specifically refer to the two constant switching power supply of filtering type LED of excitation formula big current boosting.
Background technology
Along with continuous progress scientific and technological at present, electronic product also brings great convenience to people are in life while function from strength to strength.Voltage stabilizing circuit is just runed and gives birth to, and traditional series connection linear regulator type voltage stabilizing circuit has the features such as stability is high, output voltage is adjustable, ripple coefficient is little, circuit is simple.But the Correctional tube of these series connection linear regulator type voltage stabilizing circuits is always operating at magnifying state, and have electric current to flow through, therefore the power consumption of its pipe is comparatively large, the efficiency of circuit is not high, generally can only reach about 30% ~ 50% always.In order to overcome above-mentioned defect, people just have developed switching mode voltage stabilizing circuit.
In switching mode voltage stabilizing circuit, surge pipe is operated on off state, pipe alternation saturated with cut-off two states in.When pipe saturation conduction, though it is large to flow through pipe current, but tube voltage drop is very little; When pipe ends, tube voltage drop is large, but the electric current flow through is close to zero.Therefore, under power output the same terms, the efficiency of switching mode voltage stabilizer coin series regulator is high, generally can reach about 80% ~ 90%.But it is comparatively large that the switching mode voltage stabilizer that current people adopt but exists ripple coefficient, when Correctional tube constantly switches between saturated and cut-off state, radio frequency interference can be produced to circuit, circuit more complicated and cost is higher.
Summary of the invention
The object of the invention is to the defect that ripple coefficient is comparatively large, radio frequency interference is serious, circuit is complicated and efficiency is not high overcoming the existence of current switching mode voltage stabilizer, provide the boosting of excitation formula big current two constant switching power supply of filtering type LED.
Object of the present invention is achieved through the following technical solutions: the two constant switching power supply of filtering type LED of excitation formula big current boosting, primarily of diode rectifier U, power amplifier P1, transformer T, voltage comparator U1, be serially connected in the switched filter circuit between the cathode output end of diode rectifier U and the in-phase end of power amplifier P1, the power output circuit be connected with the secondary coil L2 of transformer T, the transformation feedback circuit be connected with the secondary coil L3 of transformer T, the non-linear negative-feedback circuit be connected with transformation feedback circuit, input is connected with the cathode output end of diode rectifier U, the current sense amplifier circuit that output is connected with the IN-port of voltage comparator U1, one end is connected with the IN+ port of voltage comparator U1, the other end is in turn through oscillator that ramp generator is connected with current sense amplifier circuit after slope equalizer M, and output is connected with the tap on the primary coil L1 of transformer T, and the sliding damper that input is connected with the output of power amplifier P1 forms.Simultaneously, also be provided with the two filter circuit (10) of the boosting be connected with slope equalizer M and current sense amplifier circuit respectively, current sense amplifier circuit, the two filter circuit (10) of boosting and diode rectifier U are also connected with beam excitation formula logic amplifying circuit.
The two filter circuit of described boosting is by operational amplifier P101, operational amplifier P102, operational amplifier P103, triode VT101, triode VT102, triode VT103, P pole is as input, the diode D101 that N pole is connected with triode VT101, positive pole is connected with the N pole of diode D101, the electric capacity C101 that negative pole is connected with the base stage of triode VT101 after resistance R102, positive pole is connected with the base stage of triode VT101, the electric capacity C102 that negative pole is connected with the collector electrode of triode VT102, one end is connected with the N pole of diode D101, the inductance L 101 that the other end is connected with the negative pole of electric capacity C102, one end is connected with the collector electrode of triode VT101, the resistance R101 that the other end is connected with the base stage of triode VT102, minus earth, the electric capacity C103 that positive pole is connected with the negative pole of electric capacity C101 after resistance R104, P pole is connected with the collector electrode of triode VT103, the diode D102 that N pole is connected with the base stage of triode VT101, N pole is connected with the base stage of triode VT103, the voltage stabilizing didoe D103 that P pole is connected with the positive pole of electric capacity C103 after resistance R103, negative pole is connected with the output of operational amplifier P101, the electric capacity C108 that positive pole is connected with the positive pole of electric capacity C103 after resistance R105, be serially connected in the resistance R106 between the base stage of triode VT103 and emitter, negative pole is connected with the negative pole of electric capacity C108 after resistance R107, the electric capacity C106 that positive pole is connected with the output of operational amplifier P102, minus earth, the electric capacity C107 that positive pole is connected with the negative pole of electric capacity C106 after resistance R108, one end is connected with the emitter of triode VT103, the resistance R109 that the other end is connected with the positive pole of electric capacity C106, minus earth, the electric capacity C104 that positive pole is connected with the negative pole of electric capacity C102 after resistance R110, positive pole is connected with the negative input end of operational amplifier P103, the electric capacity C105 that negative pole is connected with the output of operational amplifier P103, one end is connected with the positive pole of electric capacity C104, the resistance R112 that the other end is connected with the negative pole of electric capacity C105, one end is connected with the positive pole of electric capacity C104, the resistance R111 that the other end is connected with the positive pole of electric capacity C105, and one end is connected with the negative pole of electric capacity C105, the other end forms with the resistance R113 that the negative pole of electric capacity C102 is connected with the positive pole of electric capacity C106 simultaneously, wherein, the P pole of voltage stabilizing didoe D103 is also connected with the negative pole of electric capacity C108 with the emitter of triode VT102 simultaneously, the positive pole of electric capacity C108 is connected with the negative input end of operational amplifier P101, the positive input terminal ground connection of operational amplifier P101, the positive pole of electric capacity C107 is connected with the positive input terminal of operational amplifier P102, the positive pole of electric capacity C106 is also connected with the negative input end of operational amplifier P102, the positive input terminal ground connection of operational amplifier P103, the negative pole of electric capacity C102 is as output and be connected with current sense amplifier circuit with slope equalizer M.
Described beam excitation formula logic amplifying circuit is primarily of power amplifier P2, NAND gate IC1, NAND gate IC2, NAND gate IC3, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C8 of positive pole ground connection after optical diode D6, one end is connected with the positive pole of polar capacitor C8, the resistance R12 of other end ground connection after diode D7, positive pole is connected with the tie point of diode D7 with resistance R12, the polar capacitor C10 of minus earth, one end is connected with the negative input of NAND gate IC1, the resistance R13 that the other end is connected with the in-phase end of power amplifier P2, be serially connected in the resistance R14 between the end of oppisite phase of power amplifier P2 and output, one end is connected with the output of NAND gate IC1, the resistance R15 that the other end is connected with the negative input of NAND gate IC3, positive pole is connected with the output of NAND gate IC2, the electric capacity C9 that negative pole is connected with the negative input of NAND gate IC3, and one end is connected with the positive pole of polar capacitor C10, the resistance R16 that the other end is connected with the negative input of NAND gate IC2 forms, the electrode input end of described NAND gate IC1 is connected with the end of oppisite phase of power amplifier P2, and its output is connected with the electrode input end of NAND gate IC2, the electrode input end of NAND gate IC3 is connected with the output of power amplifier P2, its output is then connected with current sense amplifier circuit with slope equalizer M, the output of power amplifier P2 is connected with current sense amplifier circuit, and the positive pole of polar capacitor C8 is then connected with the cathode output end of diode rectifier U, the OUT port of described voltage comparator U1 is then connected with the end of oppisite phase of power amplifier P1.
Further, described current sense amplifier circuit is made up of current sense amplifier IP1, current sense amplifier IP2, voltage detecting amplifier A and current sense amplifier IP3; Be connected with the cathode output end of diode rectifier U after described current sense amplifier IP1 is connected with the in-phase end of current sense amplifier IP2, current sense amplifier IP1 is then all connected with the output of power amplifier P2 with the end of oppisite phase of current sense amplifier IP2; The output of current sense amplifier IP1 is connected with the in-phase end of voltage detecting amplifier A, and the output of current sense amplifier IP2 is then connected with the end of oppisite phase of voltage detecting amplifier A; The output of this voltage detecting amplifier A is connected with the in-phase end of current sense amplifier IP3, the output of current sense amplifier IP3 is then connected with the IN-port of voltage comparator U1, the output of described NAND gate IC3 is then connected with the P pole of diode D101, and the output of slope equalizer M is then connected with the end of oppisite phase of current sense amplifier IP3.
Described non-linear negative-feedback circuit is by resistance R3, resistance R4, diode D4, diode D5, and transistor bridge circuits composition; The output of described power amplifier P1 is connected with one end of resistance R4 with the output of transformation feedback circuit and resistance R3 respectively, and the other end of resistance R3 is connected with transistor bridge circuits after diode D4, the other end of resistance R4 is connected with transistor bridge circuits after diode D5.
Described transistor bridge circuits is by triode Q2, triode Q3, one end is connected with the collector electrode of triode Q2, the resistance R5 that the other end is connected with the base stage of triode Q3 after resistance R6, one end is connected with the collector electrode of triode Q3, the resistance R8 that the other end is connected with the base stage of triode Q2 after resistance R7, positive pole is connected with the collector electrode of triode Q2, the electric capacity C6 that negative pole is connected with the base stage of triode Q3, negative pole is connected with the collector electrode of triode Q3, the electric capacity C7 that positive pole is connected with the base stage of transistor Q2, and one end is connected with the base stage of transistor Q2, the resistance R9 of the external+6V power supply of the other end is connected with the base stage of one end with transistor Q3, the resistance R10 of the external+6V power supply of the other end forms, the collector electrode of described transistor Q2 is connected with the tie point of diode D4 with resistance R3, its grounded emitter, the collector electrode of described transistor Q3 is connected with the tie point of diode D5 with resistance R4, its grounded emitter, meanwhile, resistance R7 is connected with the output of power amplifier P1 after resistance R3 through diode D4 in turn with the tie point of resistance R8, and resistance R5 is connected with the output of power amplifier P1 after resistance R4 through diode D5 in turn with the tie point of resistance R6.
Described switched filter circuit is by triode Q1, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form; The base stage of described triode Q1 forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1, and electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel; The collector electrode of triode Q1 is connected with the cathode output end of diode rectifier U, its grounded emitter; Resistance R2 is then connected with the in-phase end of power amplifier P1 with the tie point of diode D1, and the primary coil L1 of transformer T is then in parallel with diode D1.
The diode D2 that described power output circuit is connected with the Same Name of Ends of secondary coil L2 by P pole, N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3, and the inductance L 4 that one end is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4 forms.
Described transformation feedback circuit is made up of diode D3 and electric capacity C5; The P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, the Same Name of Ends ground connection of described secondary coil L3; Meanwhile, the output of power amplifier P1 is also connected with the tie point of electric capacity C5 with triode D3.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention utilizes the nonlinear characteristic of non-linear negative-feedback circuit, adjustable pipe is made automatically to be in edge, saturation region, not only effectively reduce circuit self and external radio frequency interference, but also greatly simplify circuit structure, cost of manufacture and maintenance cost are had reduction by a relatively large margin.
(2) present invention employs current sense amplifier circuit to realize current detecting, effectively can improve the loaded current of Switching Power Supply, make its range of application more extensive.
(3) the present invention can regulate the number of turn of primary transformer coil automatically, therefore, it is possible to carry out pressure regulation according to the actual demand of people.
(4) the present invention effectively can overcome the late effect of Switching Power Supply, can effectively improve Switching Power Supply sensitivity.
(5) the present invention is provided with the two filter circuit of boosting, can be good at filtering clutter, can also promote circuit voltage simultaneously, improve accuracy and the stability of circuit judges and operation.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the circuit diagram of the two filter circuit of boosting of the present invention.
Description of reference numerals:
10, the two filter circuit of boosting; 20, ramp generator; 30, oscillator; 40, sliding damper.
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, the constant switching power supply of non-linear negative feedback big current LED of the present invention includes diode rectifier U, power amplifier P1, transformer T, voltage comparator U1, switched filter circuit, power output circuit, transformation feedback circuit, non-linear negative-feedback circuit, current sense amplifier circuit, ramp generator 20, slope equalizer M, oscillator 30, sliding damper 40, the two filter circuit 10 of boosting and beam excitation formula logic amplifying circuit.Wherein, transformer T is by the primary coil L1 being arranged on former limit, and the secondary coil L2 and the secondary coil L3 that are arranged on secondary form.The present invention is provided with a sliding tap on the primary coil L1 of transformer T, and this sliding tap is controlled by sliding damper 40, to guarantee that the present invention can adjust the turn ratio between the primary coil L1 of transformer T and secondary coil L2 and secondary coil L3 automatically.
Wherein, the input of diode rectifier U is used for the civil power of external 220V, between the cathode output end that switched filter circuit is then serially connected in this diode rectifier U and the in-phase end of power amplifier P1.As shown in the figure, this switched filter circuit is by triode Q1, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form.Wherein, the base stage of triode Q1 forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1.Electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel, to form typical RL filter circuit.Meanwhile, the collector electrode of triode Q1 is connected with the cathode output end of diode rectifier U, its grounded emitter.Resistance R2 is then connected with the in-phase end of power amplifier P1 with the tie point of diode D1.Primary coil L1 and the diode D1 of described transformer T are in parallel.
In this switched filter circuit, resistance R1, electric capacity C1 and diode D1 form feedback-clamp circuit, can improve the peak-inverse voltage of conversion efficiency and reduction power amplifier P1 in-phase end.
As shown in Figure 2, the two filter circuit 10 of described boosting is by operational amplifier P101, operational amplifier P102, operational amplifier P103, triode VT101, triode VT102, triode VT103, resistance R101, resistance R102, resistance R103, resistance R104, resistance R105, resistance R106, resistance R107, resistance R108, resistance R109, resistance R110, resistance R111, resistance R112, resistance R113, inductance L 101, electric capacity C101, electric capacity C102, electric capacity C103, electric capacity C104, electric capacity C105, electric capacity C106, electric capacity C107, electric capacity C108, diode D101, diode D102, voltage stabilizing didoe D103 forms.
During connection, the P pole of diode D101 is as input, N pole is connected with triode VT101, the positive pole of electric capacity C101 is connected with the N pole of diode D101, negative pole is connected with the base stage of triode VT101 after resistance R102, the positive pole of electric capacity C102 is connected with the base stage of triode VT101, negative pole is connected with the collector electrode of triode VT102, one end of inductance L 101 is connected with the N pole of diode D101, the other end is connected with the negative pole of electric capacity C102, one end of resistance R101 is connected with the collector electrode of triode VT101, the other end is connected with the base stage of triode VT102, the minus earth of electric capacity C103, positive pole is connected with the negative pole of electric capacity C101 after resistance R104, the P pole of diode D102 is connected with the collector electrode of triode VT103, N pole is connected with the base stage of triode VT101, the N pole of voltage stabilizing didoe D103 is connected with the base stage of triode VT103, P pole is connected with the positive pole of electric capacity C103 after resistance R103, the negative pole of electric capacity C108 is connected with the output of operational amplifier P101, positive pole is connected with the positive pole of electric capacity C103 after resistance R105, between the base stage that resistance R106 is serially connected in triode VT103 and emitter, the negative pole of electric capacity C106 is connected with the negative pole of electric capacity C108 after resistance R107, positive pole is connected with the output of operational amplifier P102, the minus earth of electric capacity C107, positive pole is connected with the negative pole of electric capacity C106 after resistance R108, one end of resistance R109 is connected with the emitter of triode VT103, the other end is connected with the positive pole of electric capacity C106, the minus earth of electric capacity C104, positive pole is connected with the negative pole of electric capacity C102 after resistance R110, the positive pole of electric capacity C105 is connected with the negative input end of operational amplifier P103, negative pole is connected with the output of operational amplifier P103, one end of resistance R112 is connected with the positive pole of electric capacity C104, the other end is connected with the negative pole of electric capacity C105, one end of resistance R111 is connected with the positive pole of electric capacity C104, the other end is connected with the positive pole of electric capacity C105, one end of resistance R113 is connected with the negative pole of electric capacity C105, the other end is connected with the positive pole of electric capacity C106 with the negative pole of electric capacity C102 simultaneously, wherein, the P pole of voltage stabilizing didoe D103 is also connected with the negative pole of electric capacity C108 with the emitter of triode VT102 simultaneously, the positive pole of electric capacity C108 is connected with the negative input end of operational amplifier P101, the positive input terminal ground connection of operational amplifier P101, the positive pole of electric capacity C107 is connected with the positive input terminal of operational amplifier P102, the positive pole of electric capacity C106 is also connected with the negative input end of operational amplifier P102, the positive input terminal ground connection of operational amplifier P103, the negative pole of electric capacity C102 is as output and be connected with current sense amplifier circuit with slope equalizer M.
Current sense amplifier circuit is used for current detecting and the power amplification of diode rectification U, and it is made up of current sense amplifier IP1, current sense amplifier IP2, voltage detecting amplifier A and current sense amplifier IP3.During connection, current sense amplifier IP1 is all connected with the cathode output end of diode rectifier U with the in-phase end of current sense amplifier IP2, and current sense amplifier IP1 is all connected with beam excitation formula logic amplifying circuit with the end of oppisite phase of current sense amplifier IP2.
Simultaneously, the output of current sense amplifier IP1 is connected with the in-phase end of voltage detecting amplifier A, the output of current sense amplifier IP2 is then connected with the end of oppisite phase of voltage detecting amplifier A, and the output of voltage detecting amplifier A is then connected with the in-phase end of current sense amplifier IP3.
Described beam excitation formula logic amplifying circuit is primarily of power amplifier P2, NAND gate IC1, NAND gate IC2, NAND gate IC3, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C8 of positive pole ground connection after optical diode D6, one end is connected with the positive pole of polar capacitor C8, the resistance R12 of other end ground connection after diode D7, positive pole is connected with the tie point of diode D7 with resistance R12, the polar capacitor C10 of minus earth, one end is connected with the negative input of NAND gate IC1, the resistance R13 that the other end is connected with the in-phase end of power amplifier P2, be serially connected in the resistance R14 between the end of oppisite phase of power amplifier P2 and output, one end is connected with the output of NAND gate IC1, the resistance R15 that the other end is connected with the negative input of NAND gate IC3, positive pole is connected with the output of NAND gate IC2, the electric capacity C9 that negative pole is connected with the negative input of NAND gate IC3, and one end is connected with the positive pole of polar capacitor C10, the resistance R16 that the other end is connected with the negative input of NAND gate IC2 forms.
The electrode input end of described NAND gate IC1 is connected with the end of oppisite phase of power amplifier P2, and its output is connected with the electrode input end of NAND gate IC2; The electrode input end of NAND gate IC3 is connected with the output of power amplifier P2, its output is then connected with the end of oppisite phase of slope equalizer M and current sense amplifier IP3, and the output of power amplifier P2 is connected with the end of oppisite phase of current sense amplifier IP2 with current sense amplifier IP1.The positive pole of polar capacitor C8 is then connected with the cathode output end of diode rectifier U.
Voltage comparator U1 comprises three ports, namely IN-port, OUT port and IN+ port is respectively, when connecting, the input of oscillator is connected with the IN+ port of this voltage comparator U1, and its output is then connected with the end of oppisite phase of current sense amplifier IP3 after slope equalizer M through ramp generator in turn.Meanwhile, the OUT port of voltage comparator U1 is then connected with the end of oppisite phase of power amplifier P1.
The output of current sense amplifier IP3 is then connected with the IN-port of voltage comparator U1, and the OUT port of voltage comparator U1 is also connected with the end of oppisite phase of power amplifier P1, and the preferred model of voltage comparator U1 is lm311.
Power output circuit is used for output dc voltage, and it is made up of diode D2, electric capacity C3, inductance L 4 and electric capacity C4.During connection, the P pole of diode D2 is connected with the Same Name of Ends of secondary coil L2, and its N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3.One end of described inductance L 3 is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4.
Transformation feedback circuit is used for providing feedback voltage for non-linear negative-feedback circuit, and it is made up of diode D3 and electric capacity C5.During connection, the P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, the Same Name of Ends ground connection of described secondary coil L3.
Described non-linear negative-feedback circuit is by resistance R3, resistance R4, diode D4, diode D5, and transistor bridge circuits composition.During connection, the output of power amplifier P1 is connected with one end of resistance R4 with the output of transformation feedback circuit and resistance R3 respectively, and the other end of resistance R3 is connected with transistor bridge circuits after diode D4, the other end of resistance R4 is connected with transistor bridge circuits after diode D5.
Described transistor bridge circuits is by triode Q2, and triode Q3, resistance R5, resistance R6, electric capacity C6, resistance R7, resistance R8, electric capacity C7 and resistance R9 and resistance R10 form.During connection, one end of resistance R5 is connected with the collector electrode of triode Q2, and its other end is connected with the base stage of triode Q3 after resistance R6.And one end of resistance R8 is connected with the collector electrode of triode Q3, its other end is connected with the base stage of triode Q2 after resistance R7.
The positive pole of electric capacity C6 is connected with the collector electrode of triode Q2, and its negative pole is connected with the base stage of triode Q3; The negative pole of electric capacity C7 is connected with the collector electrode of triode Q3, and its positive pole is connected with the base stage of transistor Q2.One end of resistance R9 is connected with the base stage of transistor Q2, the external+6V power supply of its other end; One end of resistance R10 is connected with the base stage of transistor Q3, the external+6V power supply of its other end.
Resistance R5 is connected with the tie point of electric capacity C5 with diode D3 through diode D5 with the tie point of resistance R6 after resistance R4; Resistance R7 is then also connected with the tie point of electric capacity C5 with diode D3 after resistance R3 through diode D4 with the tie point of resistance R8.Meanwhile, the collector electrode of described transistor Q2 is connected with the tie point of diode D4 with resistance R3, its grounded emitter; The collector electrode of described transistor Q3 is connected with the tie point of diode D5 with resistance R4, its grounded emitter.
Transistor bridge circuits of the present invention is symmetrical structure, during use, by turn-on transistor Q2 and transistor Q3, and rely on negative feedback original paper diode D4 and diode D5 automatically to regulate transistor Q2 and transistor Q3 to be in edge, saturation region, thus provide enough driving voltage to regulate the tap of transformer T primary coil L1 for sliding damper, and then change the turn ratio of primary transformer coil L1 and secondary coil L2 and secondary coil L3.
For guaranteeing actual operational effect, the electric capacity C1 in the application, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6 and electric capacity C7 all adopt patch capacitor to realize.
As mentioned above, just the present invention can well be realized.
Claims (7)
1. the two constant switching power supply of filtering type LED of excitation formula big current boosting, primarily of diode rectifier U, power amplifier P1, transformer T, voltage comparator U1, be serially connected in the switched filter circuit between the cathode output end of diode rectifier U and the in-phase end of power amplifier P1, the power output circuit be connected with the secondary coil L2 of transformer T, the transformation feedback circuit be connected with the secondary coil L3 of transformer T, the non-linear negative-feedback circuit be connected with transformation feedback circuit, input is connected with the cathode output end of diode rectifier U, the current sense amplifier circuit that output is connected with the IN-port of voltage comparator U1, one end is connected with the IN+ port of voltage comparator U1, the other end is in turn through oscillator (30) that ramp generator (20) is connected with current sense amplifier circuit after slope equalizer M, and output is connected with the tap on the primary coil L1 of transformer T, and the sliding damper that input is connected with the output of power amplifier P1 (40) forms, it is characterized in that, also be provided with the two filter circuit (10) of the boosting be connected with slope equalizer M and current sense amplifier circuit respectively, at current sense amplifier circuit, the two filter circuit (10) of boosting and diode rectifier U are also connected with beam excitation formula logic amplifying circuit, the two filter circuit (10) of described boosting is by operational amplifier P101, operational amplifier P102, operational amplifier P103, triode VT101, triode VT102, triode VT103, P pole is as input, the diode D101 that N pole is connected with triode VT101, positive pole is connected with the N pole of diode D101, the electric capacity C101 that negative pole is connected with the base stage of triode VT101 after resistance R102, positive pole is connected with the base stage of triode VT101, the electric capacity C102 that negative pole is connected with the collector electrode of triode VT102, one end is connected with the N pole of diode D101, the inductance L 101 that the other end is connected with the negative pole of electric capacity C102, one end is connected with the collector electrode of triode VT101, the resistance R101 that the other end is connected with the base stage of triode VT102, minus earth, the electric capacity C103 that positive pole is connected with the negative pole of electric capacity C101 after resistance R104, P pole is connected with the collector electrode of triode VT103, the diode D102 that N pole is connected with the base stage of triode VT101, N pole is connected with the base stage of triode VT103, the voltage stabilizing didoe D103 that P pole is connected with the positive pole of electric capacity C103 after resistance R103, negative pole is connected with the output of operational amplifier P101, the electric capacity C108 that positive pole is connected with the positive pole of electric capacity C103 after resistance R105, be serially connected in the resistance R106 between the base stage of triode VT103 and emitter, negative pole is connected with the negative pole of electric capacity C108 after resistance R107, the electric capacity C106 that positive pole is connected with the output of operational amplifier P102, minus earth, the electric capacity C107 that positive pole is connected with the negative pole of electric capacity C106 after resistance R108, one end is connected with the emitter of triode VT103, the resistance R109 that the other end is connected with the positive pole of electric capacity C106, minus earth, the electric capacity C104 that positive pole is connected with the negative pole of electric capacity C102 after resistance R110, positive pole is connected with the negative input end of operational amplifier P103, the electric capacity C105 that negative pole is connected with the output of operational amplifier P103, one end is connected with the positive pole of electric capacity C104, the resistance R112 that the other end is connected with the negative pole of electric capacity C105, one end is connected with the positive pole of electric capacity C104, the resistance R111 that the other end is connected with the positive pole of electric capacity C105, and one end is connected with the negative pole of electric capacity C105, the other end forms with the resistance R113 that the negative pole of electric capacity C102 is connected with the positive pole of electric capacity C106 simultaneously, wherein, the P pole of voltage stabilizing didoe D103 is also connected with the negative pole of electric capacity C108 with the emitter of triode VT102 simultaneously, the positive pole of electric capacity C108 is connected with the negative input end of operational amplifier P101, the positive input terminal ground connection of operational amplifier P101, the positive pole of electric capacity C107 is connected with the positive input terminal of operational amplifier P102, the positive pole of electric capacity C106 is also connected with the negative input end of operational amplifier P102, the positive input terminal ground connection of operational amplifier P103, the negative pole of electric capacity C102 is as output and be connected with current sense amplifier circuit with slope equalizer M,
Described beam excitation formula logic amplifying circuit is primarily of power amplifier P2, NAND gate IC1, NAND gate IC2, NAND gate IC3, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C8 of positive pole ground connection after optical diode D6, one end is connected with the positive pole of polar capacitor C8, the resistance R12 of other end ground connection after diode D7, positive pole is connected with the tie point of diode D7 with resistance R12, the polar capacitor C10 of minus earth, one end is connected with the negative input of NAND gate IC1, the resistance R13 that the other end is connected with the in-phase end of power amplifier P2, be serially connected in the resistance R14 between the end of oppisite phase of power amplifier P2 and output, one end is connected with the output of NAND gate IC1, the resistance R15 that the other end is connected with the negative input of NAND gate IC3, positive pole is connected with the output of NAND gate IC2, the electric capacity C9 that negative pole is connected with the negative input of NAND gate IC3, and one end is connected with the positive pole of polar capacitor C10, the resistance R16 that the other end is connected with the negative input of NAND gate IC2 forms, the electrode input end of described NAND gate IC1 is connected with the end of oppisite phase of power amplifier P2, and its output is connected with the electrode input end of NAND gate IC2, the electrode input end of NAND gate IC3 is connected with the output of power amplifier P2, its output is then connected with current sense amplifier circuit with slope equalizer M, the output of power amplifier P2 is connected with current sense amplifier circuit, and the positive pole of polar capacitor C8 is then connected with the cathode output end of diode rectifier U, the OUT port of described voltage comparator U1 is then connected with the end of oppisite phase of power amplifier P1.
2. the two constant switching power supply of filtering type LED of excitation formula big current boosting according to claim 1, it is characterized in that, described current sense amplifier circuit is made up of current sense amplifier IP1, current sense amplifier IP2, voltage detecting amplifier A and current sense amplifier IP3; Be connected with the cathode output end of diode rectifier U after described current sense amplifier IP1 is connected with the in-phase end of current sense amplifier IP2, current sense amplifier IP1 is then all connected with the output of power amplifier P2 with the end of oppisite phase of current sense amplifier IP2; The output of current sense amplifier IP1 is connected with the in-phase end of voltage detecting amplifier A, and the output of current sense amplifier IP2 is then connected with the end of oppisite phase of voltage detecting amplifier A; The output of this voltage detecting amplifier A is connected with the in-phase end of current sense amplifier IP3, the output of current sense amplifier IP3 is then connected with the IN-port of voltage comparator U1, the output of described NAND gate IC3 is then connected with the P pole of diode D101, and the output of slope equalizer M is then connected with the end of oppisite phase of current sense amplifier IP3.
3. the two constant switching power supply of filtering type LED of excitation formula big current boosting according to claim 2, is characterized in that, described non-linear negative-feedback circuit is by resistance R3, resistance R4, diode D4, diode D5, and transistor bridge circuits composition; The output of described power amplifier P1 is connected with one end of resistance R4 with the output of transformation feedback circuit and resistance R3 respectively, and the other end of resistance R3 is connected with transistor bridge circuits after diode D4, the other end of resistance R4 is connected with transistor bridge circuits after diode D5.
4. the two constant switching power supply of filtering type LED of excitation formula big current boosting according to claim 3, it is characterized in that, described transistor bridge circuits is by triode Q2, triode Q3, one end is connected with the collector electrode of triode Q2, the resistance R5 that the other end is connected with the base stage of triode Q3 after resistance R6, one end is connected with the collector electrode of triode Q3, the resistance R8 that the other end is connected with the base stage of triode Q2 after resistance R7, positive pole is connected with the collector electrode of triode Q2, the electric capacity C6 that negative pole is connected with the base stage of triode Q3, negative pole is connected with the collector electrode of triode Q3, the electric capacity C7 that positive pole is connected with the base stage of transistor Q2, and one end is connected with the base stage of transistor Q2, the resistance R9 of the external+6V power supply of the other end is connected with the base stage of one end with transistor Q3, the resistance R10 of the external+6V power supply of the other end forms, the collector electrode of described transistor Q2 is connected with the tie point of diode D4 with resistance R3, its grounded emitter, the collector electrode of described transistor Q3 is connected with the tie point of diode D5 with resistance R4, its grounded emitter, meanwhile, resistance R7 is connected with the output of power amplifier P1 after resistance R3 through diode D4 in turn with the tie point of resistance R8, and resistance R5 is connected with the output of power amplifier P1 after resistance R4 through diode D5 in turn with the tie point of resistance R6.
5. the two constant switching power supply of filtering type LED of excitation formula big current boosting according to claim 3, it is characterized in that, described switched filter circuit is by triode Q1, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form; The base stage of described triode Q1 forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1, and electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel; The collector electrode of triode Q1 is connected with the cathode output end of diode rectifier U, its grounded emitter; Resistance R2 is then connected with the in-phase end of power amplifier P1 with the tie point of diode D1, and the primary coil L1 of transformer T is then in parallel with diode D1.
6. the two constant switching power supply of filtering type LED of excitation formula big current boosting according to claim 5, it is characterized in that, the diode D2 that described power output circuit is connected with the Same Name of Ends of secondary coil L2 by P pole, N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3, and the inductance L 4 that one end is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4 forms.
7. the two constant switching power supply of filtering type LED of excitation formula big current boosting according to claim 6, it is characterized in that, described transformation feedback circuit is made up of diode D3 and electric capacity C5; The P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, the Same Name of Ends ground connection of described secondary coil L3; Meanwhile, the output of power amplifier P1 is also connected with the tie point of electric capacity C5 with triode D3.
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| CN201510319245.5A CN104918380A (en) | 2014-11-25 | 2015-06-11 | Excitation type large-current boosting double-filtering LED (Light-Emitting Diode) constant switching stabilized voltage supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412344A (en) * | 2019-08-27 | 2019-11-05 | 珠海市声驰电器有限公司 | A kind of voltage detecting system |
| CN111769829A (en) * | 2020-07-22 | 2020-10-13 | 上海客益电子有限公司 | Signal conversion circuit supporting positive and negative connection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008192625A (en) * | 2008-04-17 | 2008-08-21 | Koito Mfg Co Ltd | Lighting circuit |
| CN103702486A (en) * | 2013-12-26 | 2014-04-02 | 成都芯源系统有限公司 | LED driving circuit system, control circuit and control method |
| CN203722871U (en) * | 2013-12-26 | 2014-07-16 | 成都芯源系统有限公司 | LED drive circuit system and LED drive control circuit |
-
2014
- 2014-11-25 CN CN201410685645.3A patent/CN104470093A/en active Pending
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008192625A (en) * | 2008-04-17 | 2008-08-21 | Koito Mfg Co Ltd | Lighting circuit |
| CN103702486A (en) * | 2013-12-26 | 2014-04-02 | 成都芯源系统有限公司 | LED driving circuit system, control circuit and control method |
| CN203722871U (en) * | 2013-12-26 | 2014-07-16 | 成都芯源系统有限公司 | LED drive circuit system and LED drive control circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412344A (en) * | 2019-08-27 | 2019-11-05 | 珠海市声驰电器有限公司 | A kind of voltage detecting system |
| CN111769829A (en) * | 2020-07-22 | 2020-10-13 | 上海客益电子有限公司 | Signal conversion circuit supporting positive and negative connection |
| CN111769829B (en) * | 2020-07-22 | 2023-12-08 | 上海先积集成电路有限公司 | Signal conversion circuit supporting forward and reverse connection |
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| CN104470093A (en) | 2015-03-25 |
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