CN104967337A - Double-filtering non-linear negative feedback-type logic protection emitter coupling stabilized switching power supply - Google Patents
Double-filtering non-linear negative feedback-type logic protection emitter coupling stabilized switching power supply Download PDFInfo
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- CN104967337A CN104967337A CN201510324032.1A CN201510324032A CN104967337A CN 104967337 A CN104967337 A CN 104967337A CN 201510324032 A CN201510324032 A CN 201510324032A CN 104967337 A CN104967337 A CN 104967337A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a double-filtering non-linear negative feedback-type logic protection emitter coupling stabilized switching power supply, and the power supply mainly consists of a diode rectifier U, a power amplifier P1, a transformer T, a voltage comparator U1, a switching filtering circuit, a power output circuit, a voltage transformation feedback circuit, a double-filtering amplification circuit, and a logic protection emitter coupling-type amplification circuit. The power supply can achieve the better filtering of noise signals in the circuits, achieves the amplification of the noise signals, further improves the precision of a product, enlarges the application range, also employs a current detection amplifier circuit for achieving current detection, can effectively improves the bearing current of a switching power supply, and enables the application range to be wider.
Description
Technical field
The present invention relates to a kind of switching power supply, specifically refer to two filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply.
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, two filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply is provided.
Object of the present invention is achieved through the following technical solutions:
Two filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply, 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, output holds with the IN+ of voltage comparator U1 the current sense amplifier circuit be connected, one end is held with the IN-of voltage comparator U1 and is connected, 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, two filter amplification circuit and virtual protection emitter-base bandgap grading manifold type amplifying circuit is also serially connected with between the OUT end and the end of oppisite phase of power amplifier P1 of voltage comparator U1.
Described pair of filter amplification circuit is by triode VT101, triode VT102, triode VT103, triode VT104, triode VT105, triode VT106, triode VT107, operational amplifier P101, operational amplifier P102, operational amplifier P103, one end is as input, the resistance R101 that the other end is connected with the base stage of triode VT107, the electric capacity C101 in parallel with resistance R101, one end is connected with the base stage of triode VT107, the resistance R103 that the other end is connected with the emitter of triode VT107 after resistance R105, one end is connected with the base stage of triode VT107, the resistance R102 that the other end is connected with the collector electrode of triode VT107 after resistance R104, positive pole is connected with the emitter of triode VT107, the electric capacity C104 that negative pole is connected with the tie point of resistance R105 with resistance R103, be serially connected in the resistance R114 between the base stage of triode VT101 and emitter, one end ground connection, the resistance R113 that the other end is connected with the base stage of triode VT102, P pole is connected with the base stage of triode VT103, the diode D101 that N pole is connected with the collector electrode of triode VT107 after electric capacity C103, P pole is connected with the N pole of diode D101 after diode D102, the diode D103 that N pole is connected with the base stage of triode VT106, be serially connected in the resistance R111 between the base stage of triode VT106 and collector electrode, one end ground connection, the resistance R112 that the other end is connected with the emitter of triode VT104, minus earth, the electric capacity C105 that positive pole is connected with the positive pole of electric capacity C104 after resistance R106, one end is connected with the positive pole of electric capacity C105, the resistance R108 that the other end is connected with the negative input end of operational amplifier P101, one end is connected with the positive pole of electric capacity C105, the resistance R107 that the other end is connected with the output of operational amplifier P101, be serially connected in the electric capacity C106 between the negative input end of operational amplifier P101 and output, minus earth, the electric capacity C108 that positive pole is connected with the positive input terminal of operational amplifier P102, negative pole is connected with the output of operational amplifier P101 after resistance R109, the electric capacity C107 that positive pole is connected with the negative input end of operational amplifier P102, one end is connected with the negative pole of electric capacity C107, the resistance R110 that the other end is connected with the positive pole of electric capacity C108, negative pole is connected with the base stage of triode VT107, the electric capacity C102 that positive pole is connected with the emitter of triode VT104 after resistance R115, minus earth, the electric capacity C109 that positive pole is connected with the tie point of resistance R104 with resistance R102 after resistance R116, one end is connected with the positive pole of electric capacity C109, the resistance R118 that the other end is connected with the negative input end of operational amplifier P103, one end is connected with the positive pole of electric capacity C109, the resistance R117 that the other end is connected with the positive input terminal of operational amplifier P103, and the electric capacity C110 be serially connected between the negative input end of operational amplifier P103 and output forms, wherein, the negative pole of electric capacity C104 is also connected with the collector electrode of triode VT105 with the collector electrode of triode VT106 simultaneously, the emitter of triode VT101, the collector electrode of triode VT103 is all connected with the output of operational amplifier P103 with the collector electrode of triode VT104, the positive input terminal ground connection of operational amplifier P103, the base stage of triode VT101 is connected with the emitter of triode VT102, the collector electrode of triode VT101 is connected with the base stage of triode VT102, the collector electrode of triode VT102 is connected with the base stage of triode VT103, the emitter of triode VT103 is connected with the base stage of triode VT104, the emitter of triode VT104 is connected with the emitter of triode VT105, the base stage of triode VT105 is connected with the emitter of triode VT106, the positive input terminal ground connection of operational amplifier P101, the positive pole of electric capacity C107 is also connected with the output of operational amplifier P102 and the N pole of diode D101 simultaneously, the emitter of described triode VT104 is held as output and with the OUT of voltage comparator U1 and is connected.
This virtual protection emitter-base bandgap grading manifold type amplifying circuit is primarily of triode Q4, triode Q5, power amplifier P2, power amplifier P3, be serially connected in the resistance R12 between the end of oppisite phase of power amplifier P2 and output, be serially connected in the polar capacitor C11 between the in-phase end of power amplifier P3 and output, be serially connected in the resistance R11 between the in-phase end of power amplifier P2 and the collector electrode of triode Q4, be serially connected in the resistance R13 between the collector electrode of triode Q4 and the base stage of triode Q5, the electric capacity C9 be in parallel with resistance R13, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C8 that positive pole is connected with the emitter of triode Q4 after resistance R14, be serially connected in the resistance R15 between the base stage of triode Q5 and the positive pole of polar capacitor C8, positive pole is connected with the emitter of triode Q5, negative pole is in turn through electric capacity C10 that voltage stabilizing didoe D6 is connected with the output of power amplifier P2 after resistance R16, P pole is connected with the output of power amplifier P3, the diode D7 that N pole is connected with the tie point of resistance R16 with voltage stabilizing didoe D6 after resistance R17 through resistance R18, and P pole is connected with the negative pole of electric capacity C10, the voltage stabilizing didoe D8 that N pole is connected with the tie point of resistance R18 with diode D7 forms, the base stage of described triode Q4 is connected with the positive pole of polar capacitor C8, and its emitter is connected with the emitter of triode Q5, and its collector electrode is connected with the end of oppisite phase of power amplifier P2, the collector electrode of triode Q5 is connected with the end of oppisite phase of power amplifier P3, and the in-phase end of power amplifier P3 is connected with the output of power amplifier P2, the positive pole of described polar capacitor C8 is connected with the end of oppisite phase of power amplifier P1, and resistance R18 is then connected with the input of resistance R101 with the tie point of resistance R17.
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, and the equal ground connection of the end of oppisite phase of current sense amplifier IP1 and 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, and the output of current sense amplifier IP3 is then held with the IN+ of voltage comparator U1 and is connected.
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 two filter amplification circuit, better can filter the noise signal in circuit, and amplify it, further increase accuracy and the scope of application of product.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the structural representation of virtual protection emitter-base bandgap grading manifold type amplifying circuit of the present invention.
Fig. 3 is the circuit diagram of of the present invention pair of filter amplification circuit.
Description of reference numerals:
10, two filter amplification circuit; 20, virtual protection emitter-base bandgap grading manifold type amplifying circuit; 30, ramp generator; 40, oscillator; 50, 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 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 30; slope equalizer M, oscillator 40, sliding damper 50, two filter amplification circuit 10 and virtual protection emitter-base bandgap grading manifold type amplifying circuit 20.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 50, 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 3, described pair of filter amplification circuit 10 is by triode VT101, triode VT102, triode VT103, triode VT104, triode VT105, triode VT106, triode VT107, operational amplifier P101, operational amplifier P102, operational amplifier P103, 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, resistance R114, resistance R115, resistance R116, resistance R117, resistance R118, electric capacity C101, electric capacity C102, electric capacity C103, electric capacity C104, electric capacity C105, electric capacity C106, electric capacity C107, electric capacity C108, electric capacity C109, electric capacity C110, diode D101, diode D102, diode D103 forms.
During connection, one end of resistance R101 is as input, the other end is connected with the base stage of triode VT107, electric capacity C101 is in parallel with resistance R101, one end of resistance R103 is connected with the base stage of triode VT107, the other end is connected with the emitter of triode VT107 after resistance R105, one end of resistance R102 is connected with the base stage of triode VT107, the other end is connected with the collector electrode of triode VT107 after resistance R104, the positive pole of electric capacity C104 is connected with the emitter of triode VT107, negative pole is connected with the tie point of resistance R105 with resistance R103, between the base stage that resistance R114 is serially connected in triode VT101 and emitter, one end ground connection of resistance R113, the other end is connected with the base stage of triode VT102, the P pole of diode D101 is connected with the base stage of triode VT103, N pole is connected with the collector electrode of triode VT107 after electric capacity C103, the P pole of diode D103 is connected with the N pole of diode D101 after diode D102, N pole is connected with the base stage of triode VT106, between the base stage that resistance R111 is serially connected in triode VT106 and collector electrode, one end ground connection of resistance R112, the other end is connected with the emitter of triode VT104, the minus earth of electric capacity C105, positive pole is connected with the positive pole of electric capacity C104 after resistance R106, one end of resistance R108 is connected with the positive pole of electric capacity C105, the other end is connected with the negative input end of operational amplifier P101, one end of resistance R107 is connected with the positive pole of electric capacity C105, the other end is connected with the output of operational amplifier P101, between the negative input end being serially connected in operational amplifier P101 of electric capacity C106 and output, the minus earth of electric capacity C108, positive pole is connected with the positive input terminal of operational amplifier P102, the negative pole of electric capacity C107 is connected with the output of operational amplifier P101 after resistance R109, positive pole is connected with the negative input end of operational amplifier P102, one end of resistance R110 is connected with the negative pole of electric capacity C107, the other end is connected with the positive pole of electric capacity C108, the negative pole of electric capacity C102 is connected with the base stage of triode VT107, positive pole is connected with the emitter of triode VT104 after resistance R115, the minus earth of electric capacity C109, positive pole is connected with the tie point of resistance R104 with resistance R102 after resistance R116, one end of resistance R118 is connected with the positive pole of electric capacity C109, the other end is connected with the negative input end of operational amplifier P103, one end of resistance R117 is connected with the positive pole of electric capacity C109, the other end is connected with the positive input terminal of operational amplifier P103, between the negative input end that electric capacity C110 is serially connected in operational amplifier P103 and output, wherein, the negative pole of electric capacity C104 is also connected with the collector electrode of triode VT105 with the collector electrode of triode VT106 simultaneously, the emitter of triode VT101, the collector electrode of triode VT103 is all connected with the output of operational amplifier P103 with the collector electrode of triode VT104, the positive input terminal ground connection of operational amplifier P103, the base stage of triode VT101 is connected with the emitter of triode VT102, the collector electrode of triode VT101 is connected with the base stage of triode VT102, the collector electrode of triode VT102 is connected with the base stage of triode VT103, the emitter of triode VT103 is connected with the base stage of triode VT104, the emitter of triode VT104 is connected with the emitter of triode VT105, the base stage of triode VT105 is connected with the emitter of triode VT106, the positive input terminal ground connection of operational amplifier P101, the positive pole of electric capacity C107 is also connected with the output of operational amplifier P102 and the N pole of diode D101 simultaneously, the emitter of described triode VT104 is held as output and with the OUT of voltage comparator U1 and is connected.
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 the equal ground connection of the end of oppisite phase of current sense amplifier IP1 and 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.
Voltage comparator U1 comprises three ports, namely IN+ port, OUT port and IN-port is respectively, when connecting, the input of oscillator is held with the IN-of this voltage comparator U1 and is connected, and its output is then connected with the end of oppisite phase of current sense amplifier IP3 after slope equalizer M through ramp generator 30 in turn; The output of current sense amplifier IP3 is then held with the IN+ of voltage comparator U1 and is connected, and the model of this voltage comparator U1 is preferably 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.
The structure of described virtual protection emitter-base bandgap grading manifold type amplifying circuit 20 as shown in Figure 2, it is by triode Q4, triode Q5, power amplifier P2, power amplifier P3, be serially connected in the resistance R12 between the end of oppisite phase of power amplifier P2 and output, be serially connected in the polar capacitor C11 between the in-phase end of power amplifier P3 and output, be serially connected in the resistance R11 between the in-phase end of power amplifier P2 and the collector electrode of triode Q4, be serially connected in the resistance R13 between the collector electrode of triode Q4 and the base stage of triode Q5, the electric capacity C9 be in parallel with resistance R13, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C8 that positive pole is connected with the emitter of triode Q4 after resistance R14, be serially connected in the resistance R15 between the base stage of triode Q5 and the positive pole of polar capacitor C8, positive pole is connected with the emitter of triode Q5, negative pole is in turn through electric capacity C10 that voltage stabilizing didoe D6 is connected with the output of power amplifier P2 after resistance R16, P pole is connected with the output of power amplifier P3, the diode D7 that N pole is connected with the tie point of resistance R16 with voltage stabilizing didoe D6 after resistance R17 through resistance R18, and P pole is connected with the negative pole of electric capacity C10, the voltage stabilizing didoe D8 that N pole is connected with the tie point of resistance R18 with diode D7 forms.
During connection, the base stage of described triode Q4 is connected with the positive pole of polar capacitor C8, and its emitter is connected with the emitter of triode Q5, and its collector electrode is connected with the end of oppisite phase of power amplifier P2; The collector electrode of triode Q5 is connected with the end of oppisite phase of power amplifier P3, and the in-phase end of power amplifier P3 is connected with the output of power amplifier P2.
Meanwhile, the positive pole of described polar capacitor C8 is connected with the end of oppisite phase of power amplifier P1, and resistance R18 is then connected with the input of resistance R101 with the tie point of resistance R17.
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. pair filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply, 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, output holds with the IN+ of voltage comparator U1 the current sense amplifier circuit be connected, one end is held with the IN-of voltage comparator U1 and is connected, the other end is in turn through oscillator (40) that ramp generator (30) 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 (50) forms, it is characterized in that, two filter amplification circuit (10) and virtual protection emitter-base bandgap grading manifold type amplifying circuit (20) is also serially connected with between the OUT end and the end of oppisite phase of power amplifier P1 of voltage comparator U1,
Described pair of filter amplification circuit (10) is by triode VT101, triode VT102, triode VT103, triode VT104, triode VT105, triode VT106, triode VT107, operational amplifier P101, operational amplifier P102, operational amplifier P103, one end is as input, the resistance R101 that the other end is connected with the base stage of triode VT107, the electric capacity C101 in parallel with resistance R101, one end is connected with the base stage of triode VT107, the resistance R103 that the other end is connected with the emitter of triode VT107 after resistance R105, one end is connected with the base stage of triode VT107, the resistance R102 that the other end is connected with the collector electrode of triode VT107 after resistance R104, positive pole is connected with the emitter of triode VT107, the electric capacity C104 that negative pole is connected with the tie point of resistance R105 with resistance R103, be serially connected in the resistance R114 between the base stage of triode VT101 and emitter, one end ground connection, the resistance R113 that the other end is connected with the base stage of triode VT102, P pole is connected with the base stage of triode VT103, the diode D101 that N pole is connected with the collector electrode of triode VT107 after electric capacity C103, P pole is connected with the N pole of diode D101 after diode D102, the diode D103 that N pole is connected with the base stage of triode VT106, be serially connected in the resistance R111 between the base stage of triode VT106 and collector electrode, one end ground connection, the resistance R112 that the other end is connected with the emitter of triode VT104, minus earth, the electric capacity C105 that positive pole is connected with the positive pole of electric capacity C104 after resistance R106, one end is connected with the positive pole of electric capacity C105, the resistance R108 that the other end is connected with the negative input end of operational amplifier P101, one end is connected with the positive pole of electric capacity C105, the resistance R107 that the other end is connected with the output of operational amplifier P101, be serially connected in the electric capacity C106 between the negative input end of operational amplifier P101 and output, minus earth, the electric capacity C108 that positive pole is connected with the positive input terminal of operational amplifier P102, negative pole is connected with the output of operational amplifier P101 after resistance R109, the electric capacity C107 that positive pole is connected with the negative input end of operational amplifier P102, one end is connected with the negative pole of electric capacity C107, the resistance R110 that the other end is connected with the positive pole of electric capacity C108, negative pole is connected with the base stage of triode VT107, the electric capacity C102 that positive pole is connected with the emitter of triode VT104 after resistance R115, minus earth, the electric capacity C109 that positive pole is connected with the tie point of resistance R104 with resistance R102 after resistance R116, one end is connected with the positive pole of electric capacity C109, the resistance R118 that the other end is connected with the negative input end of operational amplifier P103, one end is connected with the positive pole of electric capacity C109, the resistance R117 that the other end is connected with the positive input terminal of operational amplifier P103, and the electric capacity C110 be serially connected between the negative input end of operational amplifier P103 and output forms, wherein, the negative pole of electric capacity C104 is also connected with the collector electrode of triode VT105 with the collector electrode of triode VT106 simultaneously, the emitter of triode VT101, the collector electrode of triode VT103 is all connected with the output of operational amplifier P103 with the collector electrode of triode VT104, the positive input terminal ground connection of operational amplifier P103, the base stage of triode VT101 is connected with the emitter of triode VT102, the collector electrode of triode VT101 is connected with the base stage of triode VT102, the collector electrode of triode VT102 is connected with the base stage of triode VT103, the emitter of triode VT103 is connected with the base stage of triode VT104, the emitter of triode VT104 is connected with the emitter of triode VT105, the base stage of triode VT105 is connected with the emitter of triode VT106, the positive input terminal ground connection of operational amplifier P101, the positive pole of electric capacity C107 is also connected with the output of operational amplifier P102 and the N pole of diode D101 simultaneously, the emitter of described triode VT104 is held as output and with the OUT of voltage comparator U1 and is connected,
This virtual protection emitter-base bandgap grading manifold type amplifying circuit (20) is primarily of triode Q4, triode Q5, power amplifier P2, power amplifier P3, be serially connected in the resistance R12 between the end of oppisite phase of power amplifier P2 and output, be serially connected in the polar capacitor C11 between the in-phase end of power amplifier P3 and output, be serially connected in the resistance R11 between the in-phase end of power amplifier P2 and the collector electrode of triode Q4, be serially connected in the resistance R13 between the collector electrode of triode Q4 and the base stage of triode Q5, the electric capacity C9 be in parallel with resistance R13, negative pole is connected with the in-phase end of power amplifier P2, the polar capacitor C8 that positive pole is connected with the emitter of triode Q4 after resistance R14, be serially connected in the resistance R15 between the base stage of triode Q5 and the positive pole of polar capacitor C8, positive pole is connected with the emitter of triode Q5, negative pole is in turn through electric capacity C10 that voltage stabilizing didoe D6 is connected with the output of power amplifier P2 after resistance R16, P pole is connected with the output of power amplifier P3, the diode D7 that N pole is connected with the tie point of resistance R16 with voltage stabilizing didoe D6 after resistance R17 through resistance R18, and P pole is connected with the negative pole of electric capacity C10, the voltage stabilizing didoe D8 that N pole is connected with the tie point of resistance R18 with diode D7 forms, the base stage of described triode Q4 is connected with the positive pole of polar capacitor C8, and its emitter is connected with the emitter of triode Q5, and its collector electrode is connected with the end of oppisite phase of power amplifier P2, the collector electrode of triode Q5 is connected with the end of oppisite phase of power amplifier P3, and the in-phase end of power amplifier P3 is connected with the output of power amplifier P2, the positive pole of described polar capacitor C8 is connected with the end of oppisite phase of power amplifier P1, and resistance R18 is then connected with the input of resistance R101 with the tie point of resistance R17.
2. according to claim 1 pair of filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply, 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, and the equal ground connection of the end of oppisite phase of current sense amplifier IP1 and 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, and the output of current sense amplifier IP3 is then held with the IN+ of voltage comparator U1 and is connected.
3. according to claim 2 pair of filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply, it 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. according to claim 3 pair of filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply, 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. according to claim 4 pair of filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply, 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. according to claim 5 pair of filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply; 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. according to claim 6 pair of filtering non-linear negative feedback type virtual protection emitter-base bandgap grading manifold type switching power supply, 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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| CN201510324032.1A CN104967337A (en) | 2014-11-28 | 2015-06-12 | Double-filtering non-linear negative feedback-type logic protection emitter coupling stabilized switching power supply |
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Application publication date: 20151007 |