CN104967431A - Wideband triangular wave control system based on step-down type constant current - Google Patents
Wideband triangular wave control system based on step-down type constant current Download PDFInfo
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- CN104967431A CN104967431A CN201510323645.3A CN201510323645A CN104967431A CN 104967431 A CN104967431 A CN 104967431A CN 201510323645 A CN201510323645 A CN 201510323645A CN 104967431 A CN104967431 A CN 104967431A
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Abstract
The invention discloses a wideband triangular wave control system based on a step-down type constant current, and the system consists of a front-end power circuit, a protection circuit, a resonance circuit, a comparison circuit, a trigger circuit, a triangular wave control circuit connected with the trigger circuit, and a linear drive circuit, wherein the protection circuit and the resonance circuit are connected with the output end of the front-end power circuit, the comparison circuit and the trigger circuit are connected with the resonance circuit, and the linear drive circuit is disposed between the protection circuit and the resonance circuit. The system is characterized in that a step-down type constant current circuit is connected in series between the step-down type constant current and the protection circuit. The step-down type constant current circuit can enable the voltage and current of the control system to be higher in stability.
Description
Technical field
The present invention relates to electronic applications, specifically refer to the wideband triangular wave control system based on voltage-dropping type constant current.
Background technology
Along with the development of science and technology, the electronic product such as TV, computer appears in the middle of the life of people in a large number, all can use triangular voltage sweep circuit in the display device such as video screen, computer monitor.But triangular wave system general is at present all adopt analog circuit, is charged and produce Linear Triangular wave voltage by a constant-current source to electric capacity.This circuit is owing to being interfered, and voltage, the electric current of its circuit are also very unstable, and meeting all can produce nonlinear distortion in various degree at the initial sum tip position of triangle wave voltage.In order to overcome this nonlinear distortion usually add boostrap circuit, but just boostrap circuit also only presents good linear when triangular wave frequency is less.Therefore existing triangle wave voltage amplitude is not high, and power utilization rate is too low, simultaneously because circuit has a discharge and recharge time constant, makes triangle wave frequency be difficult to reach very low.
Summary of the invention
The object of the invention is to overcome that current triangular wave control system voltage amplitude is not high, power utilization rate is low, voltage and current is unstable, frequency is difficult to reach very low defect, a kind of wideband triangular wave control system based on voltage-dropping type constant current is provided.
Object of the present invention is achieved through the following technical solutions: based on the wideband triangular wave control system of voltage-dropping type constant current, by front end power circuit, the protective circuit be connected with front end power circuit output end and resonant circuit, the comparison circuit be connected with resonant circuit and circuits for triggering, the triangular wave control circuit be connected with circuits for triggering, and the linear drive circuit be arranged between protective circuit and resonant circuit, and the voltage-dropping type constant current circuit be serially connected between front end power circuit and protective circuit forms, described voltage-dropping type constant current electrical route step-down chip U4, triode VT9, triode VT10, amplifier P1, P pole is in turn through electric capacity C14, resistance R30, resistance R29, be connected with the REG pin of step-down chip U4 after electric capacity C15, the diode D6 that N pole is connected with the FSET pin of step-down chip U4 after resistance R31, positive pole is connected with the OUT pin of step-down chip U4 after resistance R32, the electric capacity C16 that negative pole is connected with the BST pin of step-down chip U4 after resistance R33, P pole is connected with the electrode input end of amplifier P1 after resistance R34, the diode D7 that N pole is connected with the base stage of triode VT9 after inductance L, positive pole is connected with the electrode input end of amplifier P1, the electric capacity C17 that negative pole is connected with the emitter of triode VT9 after resistance R35, negative pole is in turn through resistance R37, be connected with the base stage of triode VT9 after resistance R36, the electric capacity C18 that positive pole is connected with the collector electrode of triode VT10, and one end is connected with the negative input of amplifier P1, the resistance R28 that the other end is connected with the emitter of triode VT10 forms, the VDD pin of described step-down chip U4 is connected with the tie point of diode D6 with resistance R31, and its FB pin is then connected with the output of amplifier P1, its GND pin ground connection, the grounded collector of described triode VT9, the base stage of described triode VT10 is connected with the negative pole of electric capacity C17, the P pole of described diode D6 is connected with protective circuit, meanwhile, the base stage of triode VT9 is then connected with front end power circuit, and the N pole of diode D7 is also connected with the positive pole of electric capacity C16.
Described linear drive circuit is by driving chip U3, triode VT5, triode VT6, triode VT7, triode VT8, positive pole is connected with protective circuit, the polar capacitor C11 that negative pole is connected with the IN1 pin of driving chip U3 after resistance R21, one end is connected with the collector electrode of triode VT5, the resistance R22 that the other end is connected with the base stage of triode VT7 after resistance R23, positive pole is connected with the base stage of triode VT5, the polar capacitor C13 that negative pole is connected with the IN1 pin of driving chip U3, positive pole is connected with the IN2 pin of driving chip U3, the polar capacitor C12 of minus earth, one end is connected with the emitter of triode VT5, the resistance R25 that the other end is connected with the base stage of triode VT6, one end is connected with the base stage of triode VT6, the resistance R24 that the other end is connected with the base stage of triode VT7, N pole is connected with the collector electrode of triode VT5, the diode D4 that P pole is connected with the collector electrode of triode VT6, positive terminal is connected with the collector electrode of triode VT5, the not gate K that end of oppisite phase is connected with triode VT8 collector electrode, one end is connected with triode VT8 emitter, the resistance R27 that the other end is connected with the emitter of triode VT7 after resistance R26, and the end of oppisite phase of P pole NAND gate K is connected, the diode D5 that N pole is connected with the tie point of resistance R26 with resistance R27 forms, the VCC pin of described driving chip U3 is connected with the base stage of triode VT5, END pin ground connection, OUT pin are connected with the collector electrode of triode VT6, the collector electrode of triode VT6 is also connected with the base stage of triode VT8, its emitter is connected with the base stage of triode VT7, the grounded collector of triode VT7, the N pole of diode D5 is connected with resonant circuit.
Described front end power electric routing transformer T, diode bridge rectifier U and polar capacitor C1 forms; The electrode input end of diode bridge rectifier U is connected with the Same Name of Ends of the secondary of transformer T, negative input is connected with the non-same polarity of the secondary of transformer T, and its cathode output end is connected with the negative pole of polar capacitor C1, cathode output end is then connected with the positive pole of polar capacitor C1; The cathode output end of described diode bridge rectifier U is connected with the base stage of triode VT9 simultaneously.
Described protective circuit is by resistance R1, and resistance R2, resistance R3, electric capacity C2, electric capacity C3, electric capacity C4 and thyristor D1 form; The N pole of thyristor D1 and P pole and electric capacity C1 are in parallel, and resistance R2 and electric capacity C4 is in parallel, and one is jointly held and is connected with the P pole of thyristor D1 after resistance R1, another jointly end be then connected with the negative pole of electric capacity C3; The positive pole of electric capacity C3 is connected with the control pole of thyristor D1 after resistance R3, negative pole is then connected with the N pole of thyristor D1, and one end of electric capacity C2 is connected with the control pole of thyristor D1, the other end is connected with the N pole of thyristor D1; The positive pole of described electric capacity C4 is connected with resonant circuit, and the positive pole of electric capacity C3 is connected with the positive pole of polar capacitor C11, negative pole is connected with resonant circuit; The P pole of described thyristor D1 is connected with the P pole of diode D6.
Described resonant circuit comprises operation amplifier chip A1, triode VT1, resistance R4, resistance R5, electric capacity C5; The base stage of triode VT1 is connected with the OUT pin of operation amplifier chip A1 after resistance R5, and collector electrode is connected with comparison circuit, and emitter is connected with the negative pole of electric capacity C3; One end of resistance R4 is connected with the positive pole of comparison circuit with electric capacity C4 respectively, and the other end is connected with the negative pole of electric capacity C3 after electric capacity C5; The VCC pin of described operation amplifier chip A1 is connected with the tie point of comparison circuit with resistance R4, and its IN1 pin is connected with the N pole of diode D5, and IN2 pin is connected with the tie point of resistance R4 with electric capacity C5, GND pin ground connection.
Described comparison circuit is made up of operation amplifier chip A2, resistance R6, resistance R7, resistance R8, resistance R9; One end of resistance R8 is connected with circuits for triggering after resistance R6 through potentiometer R7 in turn, and its other end is then connected with circuits for triggering with the VCC pin of operational amplifier A 1 respectively; Between the output stage that resistance R9 is serially connected with operational amplifier A 2 and negative pole; The positive pole of described operation amplifier chip A2 is connected with the sliding end of potentiometer R7, and its negative pole is connected with the collector electrode of triode VT1, and output stage is then connected with circuits for triggering.
Described circuits for triggering comprise triode VT2, triode VT3, resistance R10, resistance R11, resistance R12, resistance R13; The collector electrode of triode VT2 is connected with the collector electrode of triode VT3 after resistance R10, and its base stage is connected with the output stage of operational amplifier A 2, and emitter is connected with the base stage of triode VT3 after resistance R13 through resistance R12; The base stage of triode VT3 is connected with the VCC pin of its collector electrode with operation amplifier chip A1 respectively, and its emitter is connected with the emitter of triode VT2; One end of resistance R11 is connected with the collector electrode of triode VT2, and its other end is then connected with the base stage of triode VT3; Resistance R12 is connected with triangular wave control circuit with the tie point of resistance R13.
Described triangular wave control circuit is made up of triangle wave generating circuit and triangular wave regulating circuit; Described triangle wave generating circuit is by the first control chip U1, base stage is through resistance R16 ground connection, collector electrode is connected with the tie point of resistance R16 with electric capacity C6, emitter is connected with the tie point of resistance R13 with resistance R12 after potentiometer R14 through resistance R15 triode VT4 after electric capacity C6, the diode D2 that N pole is connected with the OUP pin of the first control chip U1, P pole is connected with triangular wave regulating circuit after potentiometer R17, and one end is connected with V1 pin with the GND pin of the first control chip U1 respectively, the electric capacity C7 of other end ground connection forms; The V1 pin of the first described control chip U1 is also connected with the tie point of resistance R15 with potentiometer R14, its IN1 pin is then connected with the sliding end of potentiometer R14, its STR pin is connected with the positive pole of electric capacity C6 with its BAL pin respectively, V2 pin is connected with the positive pole of electric capacity C6, IN2 pin ground connection; The base stage of described triode VT4 is connected with the OUP pin of the first control chip U1, and its emitter is connected with triangular wave regulating circuit with the P pole of diode D2 respectively; The P pole of described diode D2 is also connected with the sliding end of potentiometer R17;
Described triangular wave regulating circuit is by the second control chip U2, resistance R18, resistance R19, resistance R20, electric capacity C8, electric capacity C9, electric capacity C10, diode D3, and by-pass cock Q forms; One end of resistance R18 is connected with potentiometer R17, and its other end is then connected with the IS2 pin of the second control chip U2; The positive pole of electric capacity C8, electric capacity C9 and electric capacity C10 is all connected with the IS2 pin of the second control chip U2, the negative pole of electric capacity C8 is then connected with a contact of by-pass cock Q, the negative pole of electric capacity C9 is connected with the b contact of by-pass cock Q, and the negative pole of electric capacity C10 is connected with the c contact of by-pass cock Q; The P pole of diode D3 is connected with the V2 pin of the second control chip U2, and its N pole is then connected with the control end of by-pass cock Q; One end of resistance R19 is connected with the N pole of diode D3, and its other end is then connected with the emitter of triode VT4 with the V1 pin of the second control chip U2 respectively; Between the BAL1 pin that resistance R20 is then serially connected in the second control chip U2 and BAL2 pin; The IS1 pin ground connection of described second control chip U2, OUT pin and V1 pin are then formed as the output of circuit.
For guaranteeing result of use of the present invention, described driving chip U3 is LM387 integrated chip, and step-down chip U4 then adopts A718EGT integrated chip.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention adopts voltage-dropping type constant current circuit, improves the voltage of triangular wave control system circuit, the stability of electric current, thus the output low frequency rate making this system energy stable.
(2) the present invention is provided with linear drive circuit, and the stability of control system can be made higher.
(3) the present invention is provided with triangular wave control circuit, and its power utilization rate not only can be made higher, and can export lower frequency simultaneously, thus avoids display device to occur the existing picture of nonlinear distortion.
(4) the present invention can switch different frequency ranges by rotating by-pass cock, makes frequency range wider, is applicable to different occasions.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the structural representation of linear drive circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1; the present invention is by front end power circuit; the protective circuit be connected with front end power circuit output end and resonant circuit; the comparison circuit be connected with resonant circuit and circuits for triggering; the triangular wave control circuit be connected with circuits for triggering; be arranged on the linear drive circuit between protective circuit and resonant circuit, and the voltage-dropping type constant current circuit be serially connected between front end power circuit and protective circuit forms.
Wherein, voltage-dropping type constant current electrical route step-down chip U4, triode VT9, triode VT10, amplifier P1, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, resistance R36, resistance R37, electric capacity C14, electric capacity C15, electric capacity C16, electric capacity C17, electric capacity C18, diode D6, and diode D7 forms.
During connection, the P pole of diode D6 is connected with the REG pin of step-down chip U4 in turn after electric capacity C14, resistance R30, resistance R29, electric capacity C15, N pole is connected with the FSET pin of step-down chip U4 after resistance R31.The positive pole of electric capacity C16 is connected with the OUT pin of step-down chip U4 after resistance R32, negative pole is connected with the BST pin of step-down chip U4 after resistance R33.The P pole of diode D7 is connected with the electrode input end of amplifier P1 after resistance R34, N pole is connected with the base stage of triode VT9 after inductance L.
Meanwhile, the positive pole of electric capacity C17 is connected with the electrode input end of amplifier P1, negative pole is connected with the emitter of triode VT9 after resistance R35.The negative pole of electric capacity C18 is connected with the base stage of triode VT9 in turn after resistance R37, resistance R36, positive pole is connected with the collector electrode of triode VT10.And one end of resistance R28 is connected with the negative input of amplifier P1, the other end is connected with the emitter of triode VT10.
In order to better implement the present invention, described step-down chip U4 preferentially adopts A718EGT integrated chip to realize, its built-in 2.5A MOS switch; It has Bootstrap, short-circuit protection, owes the functions such as electric locking, open-circuit-protection, overtemperature protection, voltage and current automatic constant, low-power consumption adjustment; A718EGT integrated chip adopts friendly process, and input supply voltage scope is 6 ~ 36V; Its static working current is 625 ~ 900 μ A, and cut-off current is 95 ~ 160 μ A, and constant output current is 2A.
During connection, the VDD pin of described step-down chip U4 is connected with the tie point of diode D6 with resistance R31, and its FB pin is then connected with the output of amplifier P1, its GND pin ground connection; The grounded collector of described triode VT9; The base stage of described triode VT10 is connected with the negative pole of electric capacity C17; The P pole of described diode D6 is connected with protective circuit; Meanwhile, the base stage of triode VT9 is then connected with front end power circuit, and the N pole of diode D7 is also connected with the positive pole of electric capacity C16.
For better implementing the present invention, described electric capacity C14, electric capacity C15, electric capacity C16, electric capacity C17, electric capacity C18 are polar capacitor.
As shown in Figure 2, described linear drive circuit by driving chip U3, triode VT5, triode VT6, triode VT7, triode VT8, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, electric capacity C1, electric capacity C12, electric capacity C13, diode D4, diode D5, and not gate K forms.
During connection, the positive pole of polar capacitor C11 is connected with protective circuit, negative pole is connected with the IN1 pin of driving chip U3 after resistance R21.One end of resistance R22 is connected with the collector electrode of triode VT5, the other end is connected with the base stage of triode VT7 after resistance R23.The positive pole of polar capacitor C13 is connected with the base stage of triode VT5, negative pole is connected with the IN1 pin of driving chip U3.The positive pole of polar capacitor C12 is connected with the IN2 pin of driving chip U3, minus earth.One end of resistance R25 is connected with the emitter of triode VT5, the other end is connected with the base stage of triode VT6.
Wherein, one end of resistance R24 is connected with the base stage of triode VT6, the other end is connected with the base stage of triode VT7.The N pole of diode D4 is connected with the collector electrode of triode VT5, P pole is connected with the collector electrode of triode VT6.The positive terminal of not gate K is connected with the collector electrode of triode VT5, end of oppisite phase is connected with triode VT8 collector electrode.One end of resistance R27 is connected with triode VT8 emitter, the other end is connected with the emitter of triode VT7 after resistance R26.And the end of oppisite phase of the P pole NAND gate K of diode D5 is connected, N pole is connected with the tie point of resistance R26 with resistance R27.
The linear drive circuit that the present invention is arranged, can make the stability of control system higher.
In order to ensure implementation result of the present invention, described driving chip U3 is preferably LM387 integrated chip, and the stability of this chip is high, practical and low price.
During connection, the VCC pin of described driving chip U3 is connected with the base stage of triode VT5, END pin ground connection, OUT pin are connected with the collector electrode of triode VT6, the collector electrode of triode VT6 is also connected with the base stage of triode VT8, its emitter is connected with the base stage of triode VT7, the grounded collector of triode VT7, the N pole of diode D5 is connected with resonant circuit.
Described front end power electric routing transformer T, diode bridge rectifier U and polar capacitor C1 forms; The electrode input end of diode bridge rectifier U is connected with the Same Name of Ends of the secondary of transformer T, negative input is connected with the non-same polarity of the secondary of transformer T, and its cathode output end is connected with the negative pole of polar capacitor C1, cathode output end is then connected with the positive pole of polar capacitor C1; The cathode output end of described diode bridge rectifier U is connected with the base stage of triode VT9 simultaneously.
Described protective circuit is by resistance R1, and resistance R2, resistance R3, electric capacity C2, electric capacity C3, electric capacity C4 and thyristor D1 form.
During connection, the N pole of thyristor D1 and P pole and electric capacity C1 are in parallel, and resistance R2 and electric capacity C4 is in parallel, and one is jointly held and is connected with the P pole of thyristor D1 after resistance R1, another jointly end be then connected with the negative pole of electric capacity C3.The positive pole of electric capacity C3 is connected with the control pole of thyristor D1 after resistance R3, negative pole is then connected with the N pole of thyristor D1.One end of electric capacity C2 is connected with the control pole of thyristor D1, the other end is connected with the N pole of thyristor D1.
The positive pole of described electric capacity C4 is connected with resonant circuit, and the positive pole of electric capacity C3 is connected with the positive pole of polar capacitor C11, negative pole is connected with resonant circuit.The P pole of described thyristor D1 is connected with the P pole of diode D6.Described resonant circuit comprises operation amplifier chip A1, triode VT1, resistance R4, resistance R5, electric capacity C5.
During enforcement, the base stage of triode VT1 is connected with the OUT pin of operation amplifier chip A1 after resistance R5, and collector electrode is connected with comparison circuit, and emitter is connected with the negative pole of electric capacity C3; One end of resistance R4 is connected with the positive pole of comparison circuit with electric capacity C4 respectively, and the other end is connected with the negative pole of electric capacity C3 after electric capacity C5.
The VCC pin of described operation amplifier chip A1 is connected with the tie point of comparison circuit with resistance R4, and its IN1 pin is connected with the N pole of diode D5, and IN2 pin is connected with the tie point of resistance R4 with electric capacity C5, GND pin ground connection.
Described comparison circuit is made up of operation amplifier chip A2, resistance R6, resistance R7, resistance R8, resistance R9.
One end of resistance R8 is connected with circuits for triggering after resistance R6 through potentiometer R7 in turn, and its other end is then connected with circuits for triggering with the VCC pin of operational amplifier A 1 respectively; Between the output stage that resistance R9 is serially connected with operational amplifier A 2 and negative pole; The positive pole of described operation amplifier chip A2 is connected with the sliding end of potentiometer R7, and its negative pole is connected with the collector electrode of triode VT1, and output stage is then connected with circuits for triggering.
Described circuits for triggering comprise triode VT2, triode VT3, resistance R10, resistance R11, resistance R12, resistance R13; The collector electrode of triode VT2 is connected with the collector electrode of triode VT3 after resistance R10, and its base stage is connected with the output stage of operational amplifier A 2, and emitter is connected with the base stage of triode VT3 after resistance R13 through resistance R12; The base stage of triode VT3 is connected with the VCC pin of its collector electrode with operation amplifier chip A1 respectively, and its emitter is connected with the emitter of triode VT2; One end of resistance R11 is connected with the collector electrode of triode VT2, and its other end is then connected with the base stage of triode VT3; Resistance R12 is connected with triangular wave control circuit with the tie point of resistance R13.
Described triangular wave control circuit is made up of triangle wave generating circuit and triangular wave regulating circuit.Wherein, triangle wave generating circuit is by the first control chip U1, base stage is through resistance R16 ground connection, collector electrode is connected with the tie point of resistance R16 with electric capacity C6, emitter is connected with the tie point of resistance R13 with resistance R12 after potentiometer R14 through resistance R15 triode VT4 after electric capacity C6, the diode D2 that N pole is connected with the OUP pin of the first control chip U1, P pole is connected with triangular wave regulating circuit after potentiometer R17, and one end is connected with V1 pin with the GND pin of the first control chip U1 respectively, the electric capacity C7 of other end ground connection forms.
The V1 pin of the first described control chip U1 is also connected with the tie point of resistance R15 with potentiometer R14, its IN1 pin is then connected with the sliding end of potentiometer R14, its STR pin is connected with the positive pole of electric capacity C6 with its BAL pin respectively, V2 pin is connected with the positive pole of electric capacity C6, IN2 pin ground connection.
The base stage of described triode VT4 is connected with the OUP pin of the first control chip U1, and its emitter is connected with triangular wave regulating circuit with the P pole of diode D2 respectively.The P pole of described diode D2 is also connected with the sliding end of potentiometer R17;
Described triangular wave regulating circuit is by the second control chip U2, resistance R18, resistance R19, resistance R20, electric capacity C8, electric capacity C9, electric capacity C10, diode D3, and by-pass cock Q forms.
During connection, one end of resistance R18 is connected with potentiometer R17, and its other end is then connected with the IS2 pin of the second control chip U2; The positive pole of electric capacity C8, electric capacity C9 and electric capacity C10 is all connected with the IS2 pin of the second control chip U2, and the negative pole of electric capacity C8 is then connected with a contact of by-pass cock Q, and the negative pole of electric capacity C9 is connected with the b contact of by-pass cock Q.
Wherein, the negative pole of electric capacity C10 is connected with the c contact of by-pass cock Q.The P pole of diode D3 is connected with the V2 pin of the second control chip U2, and its N pole is then connected with the control end of by-pass cock Q.One end of resistance R19 is connected with the N pole of diode D3, and its other end is then connected with the emitter of triode VT4 with the V1 pin of the second control chip U2 respectively; Between the BAL1 pin that resistance R20 is then serially connected in the second control chip U2 and BAL2 pin.
The IS1 pin ground connection of described second control chip U2, OUT pin and V1 pin are then formed as the output of circuit.According to the actual requirements, electric capacity C8, electric capacity C9, the capacitance of electric capacity C10 varies in size, and rotates by-pass cock Q and can regulate different frequency ranges, make frequency range can expand to lower frequency.When turning to a shelves, frequency range is 0.1 ~ 1.0KHz, and when turning to b shelves, frequency range is 1 ~ 10KHz, and when turning to C shelves, its frequency range is 10 ~ 100KHz.
In order to ensure implementation result, the first described control chip U1 is preferably LM311, and the second control chip U2 is preferably LF351.
As mentioned above, just well the present invention can be realized.
Claims (9)
1. based on the wideband triangular wave control system of voltage-dropping type constant current, by front end power circuit, the protective circuit be connected with front end power circuit output end and resonant circuit, the comparison circuit be connected with resonant circuit and circuits for triggering, the triangular wave control circuit be connected with circuits for triggering, and the linear drive circuit composition be arranged between protective circuit and resonant circuit, it is characterized in that: between front end power circuit and protective circuit, be also serially connected with voltage-dropping type constant current circuit, described voltage-dropping type constant current electrical route step-down chip U4, triode VT9, triode VT10, amplifier P1, P pole is in turn through electric capacity C14, resistance R30, resistance R29, be connected with the REG pin of step-down chip U4 after electric capacity C15, the diode D6 that N pole is connected with the FSET pin of step-down chip U4 after resistance R31, positive pole is connected with the OUT pin of step-down chip U4 after resistance R32, the electric capacity C16 that negative pole is connected with the BST pin of step-down chip U4 after resistance R33, P pole is connected with the electrode input end of amplifier P1 after resistance R34, the diode D7 that N pole is connected with the base stage of triode VT9 after inductance L, positive pole is connected with the electrode input end of amplifier P1, the electric capacity C17 that negative pole is connected with the emitter of triode VT9 after resistance R35, negative pole is in turn through resistance R37, be connected with the base stage of triode VT9 after resistance R36, the electric capacity C18 that positive pole is connected with the collector electrode of triode VT10, and one end is connected with the negative input of amplifier P1, the resistance R28 that the other end is connected with the emitter of triode VT10 forms, the VDD pin of described step-down chip U4 is connected with the tie point of diode D6 with resistance R31, and its FB pin is then connected with the output of amplifier P1, its GND pin ground connection, the grounded collector of described triode VT9, the base stage of described triode VT10 is connected with the negative pole of electric capacity C17, the P pole of described diode D6 is connected with protective circuit, the base stage of triode VT9 is then connected with front end power circuit simultaneously, and the N pole of diode D7 is also connected with the positive pole of electric capacity C16.
2. the wideband triangular wave control system based on voltage-dropping type constant current according to claim 1, it is characterized in that: described linear drive circuit is by driving chip U3, triode VT5, triode VT6, triode VT7, triode VT8, positive pole is connected with protective circuit, the polar capacitor C11 that negative pole is connected with the IN1 pin of driving chip U3 after resistance R21, one end is connected with the collector electrode of triode VT5, the resistance R22 that the other end is connected with the base stage of triode VT7 after resistance R23, positive pole is connected with the base stage of triode VT5, the polar capacitor C13 that negative pole is connected with the IN1 pin of driving chip U3, positive pole is connected with the IN2 pin of driving chip U3, the polar capacitor C12 of minus earth, one end is connected with the emitter of triode VT5, the resistance R25 that the other end is connected with the base stage of triode VT6, one end is connected with the base stage of triode VT6, the resistance R24 that the other end is connected with the base stage of triode VT7, N pole is connected with the collector electrode of triode VT5, the diode D4 that P pole is connected with the collector electrode of triode VT6, positive terminal is connected with the collector electrode of triode VT5, the not gate K that end of oppisite phase is connected with triode VT8 collector electrode, one end is connected with triode VT8 emitter, the resistance R27 that the other end is connected with the emitter of triode VT7 after resistance R26, and the end of oppisite phase of P pole NAND gate K is connected, the diode D5 that N pole is connected with the tie point of resistance R26 with resistance R27 forms, the VCC pin of described driving chip U3 is connected with the base stage of triode VT5, END pin ground connection, OUT pin are connected with the collector electrode of triode VT6, the collector electrode of triode VT6 is also connected with the base stage of triode VT8, its emitter is connected with the base stage of triode VT7, the grounded collector of triode VT7, the N pole of diode D5 is connected with resonant circuit, described driving chip U3 is LM387 integrated chip.
3. the wideband triangular wave control system based on voltage-dropping type constant current according to claim 2, is characterized in that: described front end power electric routing transformer T, and diode bridge rectifier U and polar capacitor C1 forms; The electrode input end of diode bridge rectifier U is connected with the Same Name of Ends of the secondary of transformer T, negative input is connected with the non-same polarity of the secondary of transformer T, and its cathode output end is connected with the negative pole of polar capacitor C1, cathode output end is then connected with the positive pole of polar capacitor C1; The cathode output end of described diode bridge rectifier U is connected with the base stage of triode VT9 simultaneously.
4. the wideband triangular wave control system based on voltage-dropping type constant current according to claim 3, is characterized in that: described protective circuit is by resistance R1, and resistance R2, resistance R3, electric capacity C2, electric capacity C3, electric capacity C4 and thyristor D1 form; The N pole of thyristor D1 and P pole and electric capacity C1 are in parallel, and resistance R2 and electric capacity C4 is in parallel, and one is jointly held and is connected with the P pole of thyristor D1 after resistance R1, another jointly end be then connected with the negative pole of electric capacity C3; The positive pole of electric capacity C3 is connected with the control pole of thyristor D1 after resistance R3, negative pole is then connected with the N pole of thyristor D1, and one end of electric capacity C2 is connected with the control pole of thyristor D1, the other end is connected with the N pole of thyristor D1; The positive pole of described electric capacity C4 is connected with resonant circuit, and the positive pole of electric capacity C3 is connected with the positive pole of polar capacitor C11, negative pole is connected with resonant circuit; The P pole of described thyristor D1 is connected with the P pole of diode D6.
5. the wideband triangular wave control system based on voltage-dropping type constant current according to claim 4, is characterized in that: described resonant circuit comprises operation amplifier chip A1, triode VT1, resistance R4, resistance R5, electric capacity C5; The base stage of triode VT1 is connected with the OUT pin of operation amplifier chip A1 after resistance R5, and collector electrode is connected with comparison circuit, and emitter is connected with the negative pole of electric capacity C3; One end of resistance R4 is connected with the positive pole of comparison circuit with electric capacity C4 respectively, and the other end is connected with the negative pole of electric capacity C3 after electric capacity C5; The VCC pin of described operation amplifier chip A1 is connected with the tie point of comparison circuit with resistance R4, and its IN1 pin is connected with the N pole of diode D5, and IN2 pin is connected with the tie point of resistance R4 with electric capacity C5, GND pin ground connection.
6. the wideband triangular wave control system based on voltage-dropping type constant current according to claim 5, is characterized in that: described comparison circuit is made up of operation amplifier chip A2, resistance R6, resistance R7, resistance R8, resistance R9; One end of resistance R8 is connected with circuits for triggering after resistance R6 through potentiometer R7 in turn, and its other end is then connected with circuits for triggering with the VCC pin of operational amplifier A 1 respectively; Between the output stage that resistance R9 is serially connected with operational amplifier A 2 and negative pole; The positive pole of described operation amplifier chip A2 is connected with the sliding end of potentiometer R7, and its negative pole is connected with the collector electrode of triode VT1, and output stage is then connected with circuits for triggering.
7. the wideband triangular wave control system based on voltage-dropping type constant current according to claim 6, is characterized in that: described circuits for triggering comprise triode VT2, triode VT3, resistance R10, resistance R11, resistance R12, resistance R13; The collector electrode of triode VT2 is connected with the collector electrode of triode VT3 after resistance R10, and its base stage is connected with the output stage of operational amplifier A 2, and emitter is connected with the base stage of triode VT3 after resistance R13 through resistance R12; The base stage of triode VT3 is connected with the VCC pin of its collector electrode with operation amplifier chip A1 respectively, and its emitter is connected with the emitter of triode VT2; One end of resistance R11 is connected with the collector electrode of triode VT2, and its other end is then connected with the base stage of triode VT3; Resistance R12 is connected with triangular wave control circuit with the tie point of resistance R13.
8. the wideband triangular wave control system based on voltage-dropping type constant current according to claim 7, is characterized in that: described triangular wave control circuit is made up of triangle wave generating circuit and triangular wave regulating circuit; Described triangle wave generating circuit is by the first control chip U1, base stage is through resistance R16 ground connection, collector electrode is connected with the tie point of resistance R16 with electric capacity C6, emitter is connected with the tie point of resistance R13 with resistance R12 after potentiometer R14 through resistance R15 triode VT4 after electric capacity C6, the diode D2 that N pole is connected with the OUP pin of the first control chip U1, P pole is connected with triangular wave regulating circuit after potentiometer R17, and one end is connected with V1 pin with the GND pin of the first control chip U1 respectively, the electric capacity C7 of other end ground connection forms; The V1 pin of the first described control chip U1 is also connected with the tie point of resistance R15 with potentiometer R14, its IN1 pin is then connected with the sliding end of potentiometer R14, its STR pin is connected with the positive pole of electric capacity C6 with its BAL pin respectively, V2 pin is connected with the positive pole of electric capacity C6, IN2 pin ground connection; The base stage of described triode VT4 is connected with the OUP pin of the first control chip U1, and its emitter is connected with triangular wave regulating circuit with the P pole of diode D2 respectively; The P pole of described diode D2 is also connected with the sliding end of potentiometer R17;
Described triangular wave regulating circuit is by the second control chip U2, resistance R18, resistance R19, resistance R20, electric capacity C8, electric capacity C9, electric capacity C10, diode D3, and by-pass cock Q forms; One end of resistance R18 is connected with potentiometer R17, and its other end is then connected with the IS2 pin of the second control chip U2; The positive pole of electric capacity C8, electric capacity C9 and electric capacity C10 is all connected with the IS2 pin of the second control chip U2, the negative pole of electric capacity C8 is then connected with a contact of by-pass cock Q, the negative pole of electric capacity C9 is connected with the b contact of by-pass cock Q, and the negative pole of electric capacity C10 is connected with the c contact of by-pass cock Q; The P pole of diode D3 is connected with the V2 pin of the second control chip U2, and its N pole is then connected with the control end of by-pass cock Q; One end of resistance R19 is connected with the N pole of diode D3, and its other end is then connected with the emitter of triode VT4 with the V1 pin of the second control chip U2 respectively; Between the BAL1 pin that resistance R20 is then serially connected in the second control chip U2 and BAL2 pin; The IS1 pin ground connection of described second control chip U2, OUT pin and V1 pin are then formed as the output of circuit.
9. the wideband triangular wave control system based on voltage-dropping type constant current according to claim 1, is characterized in that: described step-down chip U4 is A718EGT integrated chip.
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| CN201410712515.4A CN104467752A (en) | 2014-11-29 | 2014-11-29 | Broadband triangular wave control system based on linear driving |
| CN201510323645.3A CN104967431A (en) | 2014-11-29 | 2015-06-12 | Wideband triangular wave control system based on step-down type constant current |
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| CN110248127B (en) * | 2019-06-20 | 2021-03-26 | 陕西科技大学 | Radio frequency unit signal amplitude modulation circuit of broadcast transmitter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2199636Y (en) * | 1994-03-29 | 1995-05-31 | 许天昀 | Current transformer |
| US20030002192A1 (en) * | 2001-06-29 | 2003-01-02 | Ranmuthu Indumini W. | Single pole voltage bias loop for increased stability |
| CN104467453A (en) * | 2014-11-22 | 2015-03-25 | 成都智利达科技有限公司 | Control system based on broadband triangular waves |
| CN104467752A (en) * | 2014-11-29 | 2015-03-25 | 成都思茂科技有限公司 | Broadband triangular wave control system based on linear driving |
-
2014
- 2014-11-29 CN CN201410712515.4A patent/CN104467752A/en active Pending
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2015
- 2015-06-12 CN CN201510323645.3A patent/CN104967431A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2199636Y (en) * | 1994-03-29 | 1995-05-31 | 许天昀 | Current transformer |
| US20030002192A1 (en) * | 2001-06-29 | 2003-01-02 | Ranmuthu Indumini W. | Single pole voltage bias loop for increased stability |
| CN104467453A (en) * | 2014-11-22 | 2015-03-25 | 成都智利达科技有限公司 | Control system based on broadband triangular waves |
| CN104467752A (en) * | 2014-11-29 | 2015-03-25 | 成都思茂科技有限公司 | Broadband triangular wave control system based on linear driving |
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