CN104883061A - Low-pass amplification pulse modulation system based on capacitive feedback three-point oscillating circuit - Google Patents
Low-pass amplification pulse modulation system based on capacitive feedback three-point oscillating circuit Download PDFInfo
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- CN104883061A CN104883061A CN201510307235.XA CN201510307235A CN104883061A CN 104883061 A CN104883061 A CN 104883061A CN 201510307235 A CN201510307235 A CN 201510307235A CN 104883061 A CN104883061 A CN 104883061A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
- H02M5/297—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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 for conversion of frequency
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Abstract
The invention discloses a low-pass amplification pulse modulation system based on a capacitive feedback three-point oscillating circuit, which comprises a two-level low-pass filtering amplifying circuit, a peak clipping circuit, a pulse modulation circuit connected with the output end of the peak clipping circuit, and a phase shift processing circuit arranged between the pulse modulation circuit and the two-level low-pass filtering amplifying circuit. The low-pass amplification pulse modulation system is characterized in that a capacitive feedback three-point oscillating circuit is further connected between the pulse modulation circuit and the phase shift processing circuit in series. The low-pass amplification pulse modulation system disclosed by the invention can control the pulse frequency very well under the action of the capacitive feedback three-point oscillating circuit, and enables the frequency to be kept at a stable state, thereby meeting requirements of electrical appliances.
Description
Technical field
The present invention relates to electronic applications, specifically refer to that a kind of low pass based on capacitive feedback bikini oscillating circuit amplifies pulse wave modulation system.
Background technology
Being applied in social production and human lives of electric energy is more and more universal, and the electrical equipment adapting to various difference requirement also constantly occurs, in life, people use pulse wave modulation circuit to come to electric power supply usually, to meet the use of people to electrical equipment.But in actual use, its pulse wave frequency during pulse wave modulation circuit output high-power is also unstable, can not meet the electrical equipment demand that people increase day by day.
Summary of the invention
The object of the invention is to overcome traditional pulse wave circuit defect that its pulse wave frequency is also unstable when output high-power, provide a kind of low pass based on capacitive feedback bikini oscillating circuit to amplify pulse wave modulation system.
Object of the present invention is achieved through the following technical solutions: the low pass based on capacitive feedback bikini oscillating circuit amplifies pulse wave modulation system, it comprises two-stage low-pass filtering amplifying circuit, peak-clipping circuit, the pulse wave modulation circuit be connected with peak-clipping circuit output, be arranged on the phase shift treatment circuit between pulse wave modulation circuit and two-stage low-pass filtering amplifying circuit, and be serially connected in the capacitive feedback bikini oscillating circuit between pulse wave modulation circuit and phase shift treatment circuit.
Further, described capacitive feedback bikini oscillating circuit is by triode VT7, triode VT8, N pole is connected with the collector electrode of triode VT7, the diode D8 that P pole is then connected with pulse wave modulation circuit, one end is connected with the P pole of diode D8, the resistance R17 that the other end is then connected with the base stage of triode VT7, positive pole is connected with the collector electrode of triode VT8 after oscillator X1, the polar capacitor C14 of minus earth, one end is connected with the emitter of triode VT7, the resistance R18 that the other end is then connected with the negative pole of polar capacitor C14 after resistance R19, positive pole is connected with the emitter of triode VT7, the polar capacitor C13 that negative pole is then connected with the collector electrode of triode VT8, the controllable impedance L1 be in parallel with polar capacitor C13, N pole is connected with the emitter of triode VT7, the diode D9 that P pole is then connected with the negative pole of polar capacitor C14 after resistance R20, and positive pole is connected with the emitter of triode VT8, the polar capacitor C15 that negative pole is then connected with the negative pole of polar capacitor C14 forms, connect 15V voltage while the emitter of described triode VT7 is connected with phase shift treatment circuit, its collector electrode is then connected with the tie point of resistance R19 with resistance R18, the base stage of described triode VT8 is then connected with the collector electrode of triode VT7, its emitter is then connected with the P pole of diode D9.
Described phase shift treatment circuit is by phase shift chip U2, triode VT3, triode VT4, one end is connected with the VCC+ pin of phase shift chip U2, the resistance R7 that the other end is connected with the IN1 pin of phase shift chip U2, negative pole is connected with the emitter of triode VT7, the polar capacitor C4 that positive pole is connected with the IN2 pin of phase shift chip U2, one end is connected with pulse wave modulation circuit, the resistance R6 that the other end is connected with the IN1 pin of phase shift chip U2, positive pole is connected with the NC pin of phase shift chip U2 after resistance R8, the polar capacitor C6 that negative pole is connected with the collector electrode of triode VT3, positive pole is connected with the OUT pin of phase shift chip U2, the polar capacitor C5 of minus earth, one end is connected with the OUT pin of phase shift chip U2, the potentiometer R9 that the other end is connected with the collector electrode of triode VT4, P pole is connected with the OFF1 pin of phase shift chip U2, the diode D6 that N pole is connected with the base stage of triode VT3, and P pole is connected with the OFF2 pin of phase shift chip U2, the diode D7 that N pole is connected with the emitter of triode VT4 forms, VCC-pin ground connection, the OUT pin of described phase shift chip U2 are connected with the sliding end of potentiometer R9, the emitter of triode VT3 is connected with the base stage of triode VT4, and the emitter of triode VT4 is all connected with two-stage low-pass filtering amplifying circuit with the positive pole of polar capacitor C6.
Described peak-clipping circuit is by triode VT1, triode VT2, P pole inputs pole as one of system after resistance R1, the diode D1 that N pole is connected with the base stage of triode VT1, P pole after resistance R2 as system another input pole, the diode D2 that N pole is connected with the base stage of triode VT1, one end is connected with the base stage of triode VT1, the resistance R3 that the other end is connected with the base stage of triode VT2, N pole is connected with the P pole of diode D2, the diode D3 that P pole is connected with the base stage of triode VT2, N pole is connected with the P pole of diode D1, the diode D4 that P pole is connected with the base stage of triode VT2, one end is connected with the emitter of triode VT1, the resistance R4 that the other end is connected with pulse wave modulation circuit, one end is connected with the emitter of triode VT2, the resistance R5 that the other end is connected with pulse wave modulation circuit forms, described triode VT1 is all connected with pulse wave modulation circuit with the collector electrode of triode VT2.
Described pulse wave modulation circuit is by oscillating circuit, and the commutation circuit be connected with output end of oscillating circuit forms; Described oscillating circuit is by oscillator U, the polar capacitor C1 that positive pole is connected with the emitter of triode VT1 after resistance R4, negative pole is connected with the VDD pin of oscillator U, and the polar capacitor C2 that positive pole is connected with the COMP pin of oscillator U, negative pole is connected with the collector electrode of triode VT2 forms; The COMP pin of described oscillator U is connected with the collector electrode of triode VT1, PWM pin is all connected with commutation circuit with ADJ pin, GND pin ground connection.
Described commutation circuit is by trigger U1, and inverting amplifier D5, polar capacitor C3, not gate A1, not gate A2 form, the P pole of inverting amplifier D5 is connected with the PWM pin of oscillator U, N pole is connected with the SET pin of trigger U1, the positive pole of polar capacitor C3 is connected with the emitter of triode VT2 after resistance R5, the negative pole of its negative pole NAND gate A1 is connected, the positive pole of described not gate A1 is connected with the collector electrode of triode VT2, output stage is connected with the P pole of diode D8, the negative pole of not gate A2 is connected with the SET pin of trigger U1, positive pole is connected with the CT pin of trigger U1, output is connected with the IN1 pin of phase shift chip U2 after resistance R6, the SW pin of trigger U1 is connected with the ADJ pin of oscillator U, the output of SET pin NAND gate A1 is connected.
Described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with the emitter of triode VT4, the polar capacitor C7 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R10 that the other end is connected with the positive pole of polar capacitor C7, positive pole is connected with amplifier P1 inverting input after resistance R11, the polar capacitor C8 that negative pole is connected with the negative pole of polar capacitor C7, be serially connected in the polar capacitor C9 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the polar capacitor C10 that positive pole is connected with the base stage of triode VT5, one end is connected with the collector electrode of triode VT5, the resistance R12 that the other end is connected with the emitter of triode VT6, positive pole is connected with the base stage of triode VT6 after resistance R13, the polar capacitor C11 that negative pole is connected with the emitter of triode VT5 and the positive pole of polar capacitor C6 simultaneously, one end is connected with the positive pole of polar capacitor C11, the resistance R15 that the other end is connected with the inverting input of amplifier P2, the resistance R14 be in parallel with resistance R15, be serially connected in the polar capacitor C12 between the output of amplifier P2 and inverting input, and the resistance R16 be serially connected between the normal phase input end of amplifier P2 and output forms, as an output stage of system while the emitter of described triode VT5 is connected with polar capacitor C9 negative pole, the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2, and the output of amplifier P2 is as another output stage of system.
In order to reach better result of use, described oscillator U is preferably SD42524 integrated circuit, and described trigger U1 is preferably SOT-25 integrated circuit, and described phase shift chip U2 is then preferably LM741 integrated circuit and realizes.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention adopts phase shift treatment circuit, and when it can make pulse wave modulation system export high-power, pulse wave frequency still can keep stable.
(2) the present invention is by the effect of peak-clipping circuit, can provide stable voltage, prevents electrical equipment from affecting result of use and useful life because of spread of voltage.
(3) the present invention can well control arteries and veins wave frequency by the effect of capacitive feedback bikini oscillating circuit, makes frequency remain on stable state, to meet the demand of electrical appliance.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is capacitive feedback bikini oscillating circuit structural representation 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 thereto.
Embodiment
As shown in Figure 1, the present invention includes two-stage low-pass filtering amplifying circuit, peak-clipping circuit, the pulse wave modulation circuit be connected with peak-clipping circuit output, be arranged on the phase shift treatment circuit between pulse wave modulation circuit and two-stage low-pass filtering amplifying circuit, and be serially connected in the capacitive feedback bikini oscillating circuit between pulse wave modulation circuit and phase shift treatment circuit.
Wherein, phase shift treatment circuit is by phase shift chip U2, triode VT3, triode VT4, one end is connected with the VCC+ pin of phase shift chip U2, the resistance R7 that the other end is connected with the IN1 pin of phase shift chip U2, negative pole is connected with capacitive feedback bikini oscillating circuit, the polar capacitor C4 that positive pole is connected with the IN2 pin of phase shift chip U2, one end is connected with pulse wave modulation circuit, the resistance R6 that the other end is connected with the IN1 pin of phase shift chip U2, positive pole is connected with the NC pin of phase shift chip U2 after resistance R8, the polar capacitor C6 that negative pole is connected with the collector electrode of triode VT3, positive pole is connected with the OUT pin of phase shift chip U2, the polar capacitor C5 of minus earth, one end is connected with the OUT pin of phase shift chip U2, the potentiometer R9 that the other end is connected with the collector electrode of triode VT4, P pole is connected with the OFF1 pin of phase shift chip U2, the diode D6 that N pole is connected with the base stage of triode VT3, and P pole is connected with the OFF2 pin of phase shift chip U2, the diode D7 that N pole is connected with the emitter of triode VT4 forms.
During connection, VCC-pin ground connection, the OUT pin of described phase shift chip U2 are connected with the sliding end of potentiometer R9, the emitter of triode VT3 is connected with the base stage of triode VT4, and the emitter of triode VT4 is all connected with two-stage low-pass filtering amplifying circuit with the positive pole of polar capacitor C6.Phase shift treatment circuit, when pulse wave modulation system can be made to export high-power, pulse wave frequency still can keep stable.In order to ensure implementation result, described phase shift chip U2 is preferably LM741 integrated circuit.
Peak-clipping circuit can be protected system when fluctuation occurs civil power, avoids electrical appliance to be affected.It is by triode VT1, triode VT2, P pole after resistance R1 as an input of system, the diode D1 that N pole is connected with the base stage of triode VT1, P pole after resistance R2 as another input of system, the diode D2 that N pole is connected with the base stage of triode VT1, one end is connected with the base stage of triode VT1, the resistance R3 that the other end is connected with the base stage of triode VT2, N pole is connected with the P pole of diode D2, the diode D3 that P pole is connected with the base stage of triode VT2, N pole is connected with the P pole of diode D1, the diode D4 that P pole is connected with the base stage of triode VT2, one end is connected with the emitter of triode VT1, the resistance R4 that the other end is connected with pulse wave modulation circuit, one end is connected with the emitter of triode VT2, the resistance R5 that the other end is connected with pulse wave modulation circuit forms.Described triode VT1 is all connected with pulse wave modulation circuit with the collector electrode of triode VT2.
Described pulse wave modulation circuit is by oscillating circuit, and the commutation circuit be connected with output end of oscillating circuit forms.Described oscillating circuit is by oscillator U, the polar capacitor C1 that positive pole is connected with the emitter of triode VT1 after resistance R4, negative pole is connected with the VDD pin of oscillator U, and the polar capacitor C2 that positive pole is connected with the COMP pin of oscillator U, negative pole is connected with the collector electrode of triode VT2 forms; The COMP pin of described oscillator U is connected with the collector electrode of triode VT1, PWM pin is all connected with commutation circuit with ADJ pin, GND pin ground connection.Be one reach better implementation result, this oscillator U is preferably SD42524 integrated circuit.
Described commutation circuit is by trigger U1, and inverting amplifier D5, polar capacitor C3, not gate A1, not gate A2 form.During connection, the P pole needs of this inverting amplifier D5 are connected with the PWM pin of oscillator U, its N pole is connected with the SET pin of trigger U1.The positive pole of polar capacitor C3 is connected with the emitter of triode VT2 after resistance R5, the negative pole of negative pole NAND gate A1 is connected.The positive pole of described not gate A1 is connected with the collector electrode of triode VT2, output stage is connected with capacitive feedback bikini oscillating circuit, and the negative pole of not gate A2 is connected with the SET pin of trigger U1, positive pole is connected with the CT pin of trigger U1, output is connected with the IN1 pin of phase shift chip U2 after resistance R6.The SW pin of trigger U1 is connected with the ADJ pin of oscillator U, the output of SET pin NAND gate A1 is connected.In order to better implement the present invention, this trigger U1 preferentially adopts SOT-25 integrated circuit to realize.
Described two-stage low-pass filtering amplifying circuit comprises amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with the emitter of triode VT4, the polar capacitor C7 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R10 that the other end is connected with the positive pole of polar capacitor C7, positive pole is connected with amplifier P1 inverting input after resistance R11, the polar capacitor C8 that negative pole is connected with the negative pole of polar capacitor C7, be serially connected in the polar capacitor C9 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the polar capacitor C10 that positive pole is connected with the base stage of triode VT5.
In order to make filter effect better, this two-stage low-pass filtering amplifying circuit is also provided with one end and is connected with the collector electrode of triode VT5, the resistance R12 that the other end is connected with the emitter of triode VT6, positive pole is connected with the base stage of triode VT6 after resistance R13, the polar capacitor C11 that negative pole is connected with the emitter of triode VT5 and the positive pole of polar capacitor C6 simultaneously, one end is connected with the positive pole of polar capacitor C11, the resistance R15 that the other end is connected with the inverting input of amplifier P2, the resistance R14 be in parallel with resistance R15, be serially connected in the polar capacitor C12 between the output of amplifier P2 and inverting input, and the resistance R16 be serially connected between the normal phase input end of amplifier P2 and output.
Meanwhile, as an output of system while the emitter of described triode VT5 is connected with polar capacitor C9 negative pole, the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2, and the output of amplifier P2 is as another output of system.By the effect of two-stage low-pass filtering amplifying circuit, the power output making system is larger, thus can meet more electrical appliance and use simultaneously.
Capacitive feedback bikini oscillating circuit is then emphasis of the present invention, and as shown in Figure 2, it is by triode VT7, triode VT8, resistance R17, resistance R18, resistance R19, resistance R20, polar capacitor C13, polar capacitor C14, polar capacitor C15, diode D8, diode D9, controllable impedance L1 and oscillator X1 form.
During connection, the N pole of this diode D8 is connected with the collector electrode of triode VT7, its P pole is then connected with pulse wave modulation circuit, one end of resistance R17 is connected with the P pole of diode D8, its other end is then connected with the base stage of triode VT7, the positive pole of polar capacitor C14 is connected with the collector electrode of triode VT8 after oscillator X1, its minus earth, one end of resistance R18 is connected with the emitter of triode VT7, its other end is then connected with the negative pole of polar capacitor C14 after resistance R19, the positive pole of polar capacitor C13 is connected with the emitter of triode VT7, its negative pole is then connected with the collector electrode of triode VT8, controllable impedance L1 is then in parallel with polar capacitor C13, the N pole of diode D9 is connected with the emitter of triode VT7, its P pole is then connected with the negative pole of polar capacitor C14 after resistance R20, the positive pole of polar capacitor C15 is connected with the emitter of triode VT8, its negative pole is then connected with the negative pole of polar capacitor C14.
Connect 15V voltage while the emitter of described triode VT7 is connected with phase shift treatment circuit, its collector electrode is then connected with the tie point of resistance R19 with resistance R18.The base stage of described triode VT8 is then connected with the collector electrode of triode VT7, its emitter is then connected with the P pole of diode D9.
Wherein, resistance R17 is divider resistance, and it can carry out overvoltage protection to circuit.This triode VT8 is parallel resonance state, and its resonance characteristic then can make oscillator X1 have stable operating frequency.Resistance R18 and resistance R19 and resistance R20 is then biasing resistor, and the bias current of its adjustable triode VT8 base stage, makes it meet job requirement.Meanwhile, polar capacitor C13 and controllable impedance L1 then forms LC loop, and the oscillation intensity of oscillator X1 depends on this LC loop, then can regulate the oscillation intensity of oscillator X1 when regulating controllable impedance L1.In order to reach better implementation result, this triode VT8 can preferentially adopt 3DG11B transistor npn npn to realize.
As mentioned above, just the present invention can well be realized.
Claims (8)
1. the low pass based on capacitive feedback bikini oscillating circuit amplifies pulse wave modulation system, it comprises two-stage low-pass filtering amplifying circuit, peak-clipping circuit, the pulse wave modulation circuit be connected with peak-clipping circuit output, and be arranged on the phase shift treatment circuit between pulse wave modulation circuit and two-stage low-pass filtering amplifying circuit, it is characterized in that: between pulse wave modulation circuit and phase shift treatment circuit, be also serially connected with capacitive feedback bikini oscillating circuit, described capacitive feedback bikini oscillating circuit is by triode VT7, triode VT8, N pole is connected with the collector electrode of triode VT7, the diode D8 that P pole is then connected with pulse wave modulation circuit, one end is connected with the P pole of diode D8, the resistance R17 that the other end is then connected with the base stage of triode VT7, positive pole is connected with the collector electrode of triode VT8 after oscillator X1, the polar capacitor C14 of minus earth, one end is connected with the emitter of triode VT7, the resistance R18 that the other end is then connected with the negative pole of polar capacitor C14 after resistance R19, positive pole is connected with the emitter of triode VT7, the polar capacitor C13 that negative pole is then connected with the collector electrode of triode VT8, the controllable impedance L1 be in parallel with polar capacitor C13, N pole is connected with the emitter of triode VT7, the diode D9 that P pole is then connected with the negative pole of polar capacitor C14 after resistance R20, and positive pole is connected with the emitter of triode VT8, the polar capacitor C15 that negative pole is then connected with the negative pole of polar capacitor C14 forms, connect 15V voltage while the emitter of described triode VT7 is connected with phase shift treatment circuit, its collector electrode is then connected with the tie point of resistance R19 with resistance R18, the base stage of described triode VT8 is then connected with the collector electrode of triode VT7, its emitter is then connected with the P pole of diode D9.
2. the low pass based on capacitive feedback bikini oscillating circuit according to claim 1 amplifies pulse wave modulation system, it is characterized in that: described phase shift treatment circuit is by phase shift chip U2, triode VT3, triode VT4, one end is connected with the VCC+ pin of phase shift chip U2, the resistance R7 that the other end is connected with the IN1 pin of phase shift chip U2, negative pole is connected with the emitter of triode VT7, the polar capacitor C4 that positive pole is connected with the IN2 pin of phase shift chip U2, one end is connected with pulse wave modulation circuit, the resistance R6 that the other end is connected with the IN1 pin of phase shift chip U2, positive pole is connected with the NC pin of phase shift chip U2 after resistance R8, the polar capacitor C6 that negative pole is connected with the collector electrode of triode VT3, positive pole is connected with the OUT pin of phase shift chip U2, the polar capacitor C5 of minus earth, one end is connected with the OUT pin of phase shift chip U2, the potentiometer R9 that the other end is connected with the collector electrode of triode VT4, P pole is connected with the OFF1 pin of phase shift chip U2, the diode D6 that N pole is connected with the base stage of triode VT3, and P pole is connected with the OFF2 pin of phase shift chip U2, the diode D7 that N pole is connected with the emitter of triode VT4 forms, VCC-pin ground connection, the OUT pin of described phase shift chip U2 are connected with the sliding end of potentiometer R9, the emitter of triode VT3 is connected with the base stage of triode VT4, and the emitter of triode VT4 is all connected with two-stage low-pass filtering amplifying circuit with the positive pole of polar capacitor C6.
3. the low pass based on capacitive feedback bikini oscillating circuit according to claim 2 amplifies pulse wave modulation system, it is characterized in that: described peak-clipping circuit is by triode VT1, triode VT2, P pole inputs pole as one of system after resistance R1, the diode D1 that N pole is connected with the base stage of triode VT1, P pole after resistance R2 as system another input pole, the diode D2 that N pole is connected with the base stage of triode VT1, one end is connected with the base stage of triode VT1, the resistance R3 that the other end is connected with the base stage of triode VT2, N pole is connected with the P pole of diode D2, the diode D3 that P pole is connected with the base stage of triode VT2, N pole is connected with the P pole of diode D1, the diode D4 that P pole is connected with the base stage of triode VT2, one end is connected with the emitter of triode VT1, the resistance R4 that the other end is connected with pulse wave modulation circuit, one end is connected with the emitter of triode VT2, the resistance R5 that the other end is connected with pulse wave modulation circuit forms, described triode VT1 is all connected with pulse wave modulation circuit with the collector electrode of triode VT2.
4. the low pass based on capacitive feedback bikini oscillating circuit according to claim 3 amplifies pulse wave modulation system, it is characterized in that: described pulse wave modulation circuit is by oscillating circuit, and the commutation circuit be connected with output end of oscillating circuit forms; Described oscillating circuit is by oscillator U, the polar capacitor C1 that positive pole is connected with the emitter of triode VT1 after resistance R4, negative pole is connected with the VDD pin of oscillator U, and the polar capacitor C2 that positive pole is connected with the COMP pin of oscillator U, negative pole is connected with the collector electrode of triode VT2 forms; The COMP pin of described oscillator U is connected with the collector electrode of triode VT1, PWM pin is all connected with commutation circuit with ADJ pin, GND pin ground connection;
Described commutation circuit is by trigger U1, and inverting amplifier D5, polar capacitor C3, not gate A1, not gate A2 form, the P pole of inverting amplifier D5 is connected with the PWM pin of oscillator U, N pole is connected with the SET pin of trigger U1, the positive pole of polar capacitor C3 is connected with the emitter of triode VT2 after resistance R5, the negative pole of its negative pole NAND gate A1 is connected, the positive pole of described not gate A1 is connected with the collector electrode of triode VT2, output stage is connected with the P pole of diode D8, the negative pole of not gate A2 is connected with the SET pin of trigger U1, positive pole is connected with the CT pin of trigger U1, output is connected with the IN1 pin of phase shift chip U2 after resistance R6, the SW pin of trigger U1 is connected with the ADJ pin of oscillator U, the output of SET pin NAND gate A1 is connected.
5. the low pass based on capacitive feedback bikini oscillating circuit according to claim 4 amplifies pulse wave modulation system, it is characterized in that: described two-stage low-pass filtering amplifying circuit is by amplifier P1, amplifier P2, triode VT5, triode VT6, positive pole is connected with the emitter of triode VT4, the polar capacitor C7 of minus earth, one end is connected with the normal phase input end of amplifier P1, the resistance R10 that the other end is connected with the positive pole of polar capacitor C7, positive pole is connected with amplifier P1 inverting input after resistance R11, the polar capacitor C8 that negative pole is connected with the negative pole of polar capacitor C7, be serially connected in the polar capacitor C9 between the output of amplifier P1 and inverting input, negative pole is connected with the output of amplifier P1, the polar capacitor C10 that positive pole is connected with the base stage of triode VT5, one end is connected with the collector electrode of triode VT5, the resistance R12 that the other end is connected with the emitter of triode VT6, positive pole is connected with the base stage of triode VT6 after resistance R13, the polar capacitor C11 that negative pole is connected with the emitter of triode VT5 and the positive pole of polar capacitor C6 simultaneously, one end is connected with the positive pole of polar capacitor C11, the resistance R15 that the other end is connected with the inverting input of amplifier P2, the resistance R14 be in parallel with resistance R15, be serially connected in the polar capacitor C12 between the output of amplifier P2 and inverting input, and the resistance R16 be serially connected between the normal phase input end of amplifier P2 and output forms, as an output stage of system while the emitter of described triode VT5 is connected with polar capacitor C9 negative pole, the collector electrode of triode VT6 is connected with the normal phase input end of amplifier P2, and the output of amplifier P2 is as another output stage of system.
6. the low pass based on capacitive feedback bikini oscillating circuit according to claim 5 amplifies pulse wave modulation system, it is characterized in that: described oscillator U is SD42524 integrated circuit.
7. the low pass based on capacitive feedback bikini oscillating circuit according to claim 5 amplifies pulse wave modulation system, it is characterized in that: described trigger U1 is SOT-25 integrated circuit.
8. the low pass based on capacitive feedback bikini oscillating circuit according to claim 5 amplifies pulse wave modulation system, it is characterized in that: described phase shift chip U2 is LM741 integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510307235.XA CN104883061A (en) | 2014-11-26 | 2015-06-06 | Low-pass amplification pulse modulation system based on capacitive feedback three-point oscillating circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2014106923640 | 2014-11-26 | ||
| CN201410692364.0A CN104410285A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based pulse modulation system by low-pass amplification |
| CN201510307235.XA CN104883061A (en) | 2014-11-26 | 2015-06-06 | Low-pass amplification pulse modulation system based on capacitive feedback three-point oscillating circuit |
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| CN104883061A true CN104883061A (en) | 2015-09-02 |
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| CN201410692364.0A Pending CN104410285A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based pulse modulation system by low-pass amplification |
| CN201510307235.XA Pending CN104883061A (en) | 2014-11-26 | 2015-06-06 | Low-pass amplification pulse modulation system based on capacitive feedback three-point oscillating circuit |
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| CN203964222U (en) * | 2014-06-04 | 2014-11-26 | 三亚江大科技发展有限公司 | A kind of new and effective spray cooling device |
| CN104410285A (en) * | 2014-11-26 | 2015-03-11 | 成都创图科技有限公司 | Phase-shift processing based pulse modulation system by low-pass amplification |
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| CN203964222U (en) * | 2014-06-04 | 2014-11-26 | 三亚江大科技发展有限公司 | A kind of new and effective spray cooling device |
| CN104410285A (en) * | 2014-11-26 | 2015-03-11 | 成都创图科技有限公司 | Phase-shift processing based pulse modulation system by low-pass amplification |
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| WIDDZKAR: "电容三点式振荡器", 《百度》 * |
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