CN106300958B - A kind of carrier generating circuit of pulse frequency modulated - Google Patents
A kind of carrier generating circuit of pulse frequency modulated Download PDFInfo
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- CN106300958B CN106300958B CN201610651536.9A CN201610651536A CN106300958B CN 106300958 B CN106300958 B CN 106300958B CN 201610651536 A CN201610651536 A CN 201610651536A CN 106300958 B CN106300958 B CN 106300958B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/06—Frequency or rate modulation, i.e. PFM or PRM
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Amplifiers (AREA)
Abstract
The present invention provides a kind of carrier generating circuits of the pulse frequency modulated in unity power factor correction field, including fall sinewave circuit and carrier generating circuit.The sinewave circuit is mainly made of full-wave rectifying circuit and subtraction circuit two parts, so that output end is generated sine wave, and pass to carrier generating circuit as input, carrier generating circuit generates triangular wave corresponding with sine wave.The present invention has built the carrier generating circuit of pulse frequency modulated with hardware circuit, reduces the cost using controller and algorithm realization, hardware circuit is simple, there is certain application value.
Description
Technical field
The present invention relates to Technics of Power Electronic Conversion technical fields, and in particular, to a kind of carrier wave generation of pulse frequency modulated
Circuit.
Background technique
Pulse frequency modulated (PFM) is a kind of pulse modulation method, and basic thought is the frequency of modulated signal with input
The amplitude of signal and change, and duty ratio is constant.Pulse frequency modulated is often applied in DC-DC power converter, for mentioning
The efficiency that height gently loads.
After searching and discovering the prior art, the side such as control algolithm is concentrated mainly on about the research of pulse frequency modulated
Face.Qi Chen et al. proposes a kind of improved three-phase inverter pulse frequency modulated technology in " Electrified Transmission " in 2014,
The technology is controlled using DSP, by segmenting modulation period, selects pulse width appropriate, then cooperate pulse position modulation
Technology, it is suppressed that harmonic wave improves output current wave quality；Yang Houyue et al. proposed one in patent disclosed in 2015
Pulse frequency modulation circuit of the kind based on RC oscillator changes oscillation frequency by adjusting the operating current size of RC oscillating circuit
Rate, so as to adjust the frequency of clock signal, pulse signal required for obtaining.
In the practical application of converters, up to now, Design of Digital Controller pulse is still seldom used
Frequency modulating technology carries out electromagnetic interference (EMI) and inhibits.Single-phase power factor correcting device is mostly applied in household appliance technical field, family
Requirement of the electrical appliance equipment to EMI is very high, can use pulse frequency modulated technology, including digitial controller or simulation thus
Controller.When using analog controller, relatively lack a kind of the hard of the carrier generating circuit of generation pulse frequency modulated at present
Part implementation method.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of pulses in unity power factor correction field
Warbled carrier generating circuit, the circuit are a kind of hardware implementation methods of pulse frequency modulated.
A kind of carrier generating circuit of the pulse frequency modulated provided according to the present invention, including fall sinewave circuit and carrier wave
Circuit occurs.The output end of the sinewave circuit generates sine wave, and carrier wave hair is passed in the conduct of falling sine wave input
Raw circuit, carrier generating circuit generate triangular wave corresponding with sine wave.
Preferably, the sinewave circuit includes full-wave rectifying circuit and subtraction circuit, and full-wave rectifying circuit includes
Diode D1, diode D2 and capacitor C1, subtraction circuit include resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity
Hinder R6, resistance R7 and amplifier OP1.
Specifically, the anode of diode D1 is connected with one end of ac power input end ACL and capacitor C1 respectively, diode
The anode of D2 is connected with the other end of ac power input end CAN and capacitor C1 respectively, the cathode of diode D2 respectively with two poles
The cathode of pipe D1 is connected with one end of resistance R1, and the other end of resistance R1 is connected with one end of resistance R2 and resistance R6 respectively, electricity
The other end ground connection of R2 is hindered, an end of resistance R3 is connected to 15V voltage, and the other end of resistance R3 is respectively with resistance R4's and resistance R5
One end is connected, and the other end ground connection of resistance R4, another non-inverting input terminal for terminating to amplifier OP1 of resistance R5, resistance R6's is another
One end is connected to the reverse input end of amplifier OP1, and is connected with one end of resistance R7, and amplifier OP1 connects 15V voltage, and amplifier OP1's is defeated
Outlet is connected with the other end of resistance R7.
Preferably, the carrier generating circuit include voltage-stabiliser tube ZD1, triode TR1, resistance R8, resistance R9, resistance R10,
Resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, capacitor C2, inverse conductivity type switching device FET1, inverse conductivity type switch
Device FET2 and amplifier OP2.
Specifically, the cathode of voltage-stabiliser tube ZD1 is connected with the collector of the output end of amplifier OP1 and triode TR1 respectively, surely
The anode of pressure pipe ZD1 is connected with the base stage of one end of resistance R8, triode TR1 respectively, the other end ground connection of resistance R8, triode
The emitter of TR1 is connected with one end of one end of capacitor C2, the drain electrode of inverse conductivity type switching device FET1 and resistance R9 respectively, capacitor
The other end of C2 is grounded, and the other end of resistance R9 is connected with one end of resistance R13, another same phase for terminating to amplifier OP2 of R13
Input terminal, an end of resistance R10 are connected to 15V voltage, the other end of resistance R10 respectively with resistance R11, resistance R12 and resistance R14
One end be connected, another drain electrode for terminating to inverse conductivity type switching device FET2 of resistance R11, the another of resistance R12 terminates to fortune
Put the inverting input terminal of OP2, the other end ground connection of resistance R14, amplifier OP2 connection 15V voltage, the output end and electricity of amplifier OP2
The one end for hindering R15 is connected, the other end of resistance R15 respectively with the gate pole of inverse conductivity type switching device FET1 and inverse conductivity type switching device
The gate pole of FET2 is connected, and the source electrode of the source electrode of inverse conductivity type switching device FET1 and inverse conductivity type switching device FET2 are grounded, capacitor C2
Output end of the both ends as entire carrier generating circuit.
The course of work and working principle of the invention are as follows: full-wave rectifying circuit first rectifies input ac voltage, is formed
Full-wave rectified voltage is then divided by resistance, and is linked into subtracter and is carried out subtraction, and output end is had
The voltage waveform of sine wave charges to capacitor C2 after the voltage input to carrier generating circuit, when capacitor C2's
When voltage reaches the voltage of amplifier (being used as comparator) OP2 inverting input terminal, amplifier OP2 output is positive, inverse conductivity type switching device
The gate pole of FET1 and inverse conductivity type switching device FET2 are applied forward voltage and are connected, and the charge on capacitor C1 is quickly released,
Voltage declines immediately, simultaneously as against the conducting of conductivity type switching device FET2, in resistance R11 access circuit, amplifier OP2's
Inverting input terminal voltage is reduced since resistance R11 and resistance R12 is in parallel.When the voltage on capacitor C2 is reduced to than amplifier OP2
New inverting input terminal voltage it is also low when, the output end of amplifier OP2 becomes 0, and inverse conductivity type switching device FET1 and inverse conductivity type are opened
The gate pole shutdown of device FET2 is closed, capacitor C1 starts to recharge.When charging voltage is higher than the inverting input terminal voltage of amplifier OP2
When, amplifier OP2 output is positive, and capacitor C2 starts to discharge, and loops back and forth like this, and is formed and carries with falling the matched triangle of sine wave
Wave.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, carrier wave generation realizes have real-time and rapidity, reduce using controller inaccuracy with hardware circuit,
Particularly suitable power factor corrector；
2, carrier frequency changes with the variation of instantaneous voltage size, advantageously reduces EMI；
3, carrier frequency is low when instantaneous voltage is high, advantageously reduces switching loss.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the circuit diagram of embodiment provided by the invention；Wherein, 1 is sinewave circuit, and 2 be carrier wave
Circuit.
Fig. 2 is full-wave rectifying circuit terminal voltage waveform diagram.
Fig. 3 is amplifier OP1 output end voltage waveform diagram.
Fig. 4 is capacitor C2 both end voltage waveform diagram.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
A kind of carrier generating circuit of the pulse frequency modulated provided according to the present invention, including fall sinewave circuit and carrier wave
Circuit occurs.The sinewave circuit is mainly made of full-wave rectifying circuit and subtraction circuit two parts, produces output end
Raw sine wave, and its (sine wave) is passed into carrier generating circuit as input, carrier generating circuit generates and sine
The corresponding triangular wave of wave.
Preferably, the sinewave circuit includes full-wave rectifying circuit and subtraction circuit, and full-wave rectifying circuit includes
Diode D1, diode D2 and capacitor C1, subtraction circuit include resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity
Hinder R6, resistance R7 and amplifier OP1.
The anode of diode D1 is connected with one end of ac power input end ACL and capacitor C1 respectively, the sun of diode D2
Pole is connected with the other end of ac power input end CAN and capacitor C1 respectively, and the cathode of diode D2 is respectively with diode D1's
Cathode is connected with one end of resistance R1, and the other end of resistance R1 is connected with one end of resistance R2 and resistance R6 respectively, resistance R2's
Other end ground connection, an end of resistance R3 are connected to 15V voltage, the other end of resistance R3 one end phase with resistance R4 and resistance R5 respectively
Even, the other end ground connection of resistance R4, another non-inverting input terminal for terminating to amplifier OP1 of resistance R5, another termination of resistance R6
Be connected to the reverse input end of amplifier OP1, and with one end of resistance R7, amplifier OP1 connects 15V voltage, the output end of amplifier OP1 with
The other end of resistance R7 is connected.
Preferably, the carrier generating circuit include voltage-stabiliser tube ZD1, triode TR1, resistance R8, resistance R9, resistance R10,
Resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, capacitor C2, inverse conductivity type switching device FET1, inverse conductivity type switch
Device FET2 and amplifier OP2.
Specifically, the cathode of voltage-stabiliser tube ZD1 is connected with the collector of the output end of amplifier OP1 and triode TR1 respectively, surely
The anode of pressure pipe ZD1 is connected with the base stage of one end of resistance R8, triode TR1 respectively, the other end ground connection of resistance R8, triode
The emitter of TR1 is connected with one end of one end of capacitor C2, the drain electrode of inverse conductivity type switching device FET1 and resistance R9 respectively, capacitor
The other end of C2 is grounded, and the other end of resistance R9 is connected with one end of resistance R13, another same phase for terminating to amplifier OP2 of R13
Input terminal, an end of resistance R10 are connected to 15V voltage, the other end of resistance R10 respectively with resistance R11, resistance R12 and resistance R14
One end be connected, another drain electrode for terminating to inverse conductivity type switching device FET2 of resistance R11, the another of resistance R12 terminates to fortune
Put the inverting input terminal of OP2, the other end ground connection of resistance R14, amplifier OP2 connection 15V voltage, the output end and electricity of amplifier OP2
The one end for hindering R15 is connected, the other end of resistance R15 respectively with the gate pole of inverse conductivity type switching device FET1 and inverse conductivity type switching device
The gate pole of FET2 is connected, and the source electrode of the source electrode of inverse conductivity type switching device FET1 and inverse conductivity type switching device FET2 are grounded, capacitor C2
Output end of the both ends as entire carrier generating circuit.
The course of work and working principle of the invention are as follows: full-wave rectifying circuit first rectifies input ac voltage, is formed
Full-wave rectified voltage, as shown in Figure 2.Then it is divided by resistance, and is linked into subtracter and carries out subtraction, exported
End obtains the voltage waveform with sine wave, as shown in Figure 3.Capacitor C2 is carried out after the voltage input to carrier generating circuit
Charging, when the voltage of capacitor C2 rises the voltage for reaching amplifier (being used as comparator) OP2 inverting input terminal, amplifier OP2 output
It is positive, the gate pole of inverse conductivity type switching device FET1 and inverse conductivity type switching device FET2 are applied forward voltage and are connected, capacitor C1
On charge be quickly released, voltage drops to zero immediately, simultaneously as the conducting of inverse conductivity type switching device FET2, resistance R11
In access circuit, the inverting input terminal voltage of amplifier OP2 is reduced since resistance R11 and resistance R12 is in parallel.When on capacitor C2
Voltage when being reduced to also lower than the new inverting input terminal voltage of amplifier OP2, the output end of amplifier OP2 becomes zero, inverse conductivity type
The gate pole of switching device FET1 and inverse conductivity type switching device FET2 turn off, and capacitor C1 starts to recharge.When charging voltage is than transporting
Put OP2 inverting input terminal voltage it is high when, amplifier OP2 output be positive, capacitor C2 starts to discharge, loop back and forth like this, just formed
With falling sine wave matched triangular carrier, as shown in figure 4, the flat rate of triangular carrier is high, and reverse-frequency is low when instantaneous value is high.
In the present embodiment, a kind of carrier generating circuit of pulse frequency modulated, including diode D1-D2, capacitor
C1-C2, resistance R1-R15, amplifier OP1-OP2, voltage-stabiliser tube ZD1, triode TR1 and inverse conductivity type switching device FET1-FET2,
In:
The both ends capacitor C1 connect ac power input end, and are respectively connected with the anode of diode D1 and diode D2；
The cathode of diode D1 and diode D2 link together, and are connected with one end of resistance R1；
The other end of resistance R1 is connected with one end of resistance R2 and resistance R6；
A termination 15V voltage of resistance R3, the other end of resistance R3 are connected with one end of resistance R5 and resistance R4；
The other end of resistance R2 and resistance R4 ground connection；
The non-inverting input terminal of amplifier OP1 is connected with the other end of resistance R5, and the inverting input terminal of amplifier OP1 is with resistance R6's
The other end is connected with one end of resistance R7, the output end of the other end connection amplifier OP1 of resistance R7；
The cathode of voltage-stabiliser tube ZD1 is connected with the output end of amplifier OP1, one end of the anode connection resistance R8 of voltage-stabiliser tube ZD1
With the base stage of triode TR1；
The collector of triode TR1 is connected with the output end of amplifier OP1, the emitter of triode TR1 and the one of capacitor C2
The drain electrode at end, inverse conductivity type switching device FET1 is connected with one end of resistance R9；
The other end of resistance R8 and capacitor C2 ground connection；
The other end of resistance R9 connects resistance R13, the non-inverting input terminal of the other end connection amplifier OP2 of resistance R13；
A termination 15V voltage of resistance R10, the one of the other end of resistance R10 and resistance R11, resistance R12 and resistance R14
End is connected；
The drain electrode of another termination of resistance R11 against conductivity type switching device FET2 are connected, the other end and amplifier of resistance R12
The inverting input terminal of OP2 is connected；
The source electrode of resistance R14, the source electrode of inverse conductivity type switching device FET1 and inverse conductivity type switching device FET2 are grounded；
The output end of amplifier OP2 is connected with one end of resistance R15, and the other end of resistance R15 connects inverse conductivity type switching device
The gate pole of FET1 and inverse conductivity type switching device FET2.
The type selecting of above-mentioned each component in this example, can be preferred are as follows:
Power supply: AC power source 220V；
Diode D1-D2:600V, 1A/100 DEG C；
Capacitor C1:500V, 100 μ F, for filtering；
Resistance R1:300k Ω；
Resistance R2:2k Ω；
Resistance R3:10k Ω；
Resistance R4:5k Ω；
Resistance R5-R7:1k Ω；
Voltage-stabiliser tube ZD1:10V, 1A/100 DEG C；
Resistance R8:2k Ω；
Triode TR1:NPN type, 9013；
Capacitor C2:10nF；
Resistance R9:1k Ω；
Resistance R10:1k Ω；
Resistance R11:2k Ω；
Resistance R12:1k Ω；
Resistance R13:1k Ω；
Resistance R14:2k Ω；
Resistance R15:1k Ω；
Inverse conductivity type switching device FET1-FET2:33V, 1A/100 DEG C；
Amplifier OP1-OP2:LM358.
When entire circuit specific works:
As shown in Figure 1, full-wave rectifying circuit is first to input ac voltage (Ui) rectification, form full-wave rectified voltage.It connects
Divided by resistance R1 and resistance R2, obtain suitable voltage, and be linked into and subtracted by what amplifier OP1 and peripheral resistance were constituted
Subtraction is carried out in musical instruments used in a Buddhist or Taoist mass, output end obtains the voltage waveform with sine wave.The voltage (Uo) it is input to load
It charges after wave generation circuit to capacitor C2, the voltage at the both ends capacitor C2 gradually rises.When the voltage of capacitor C2 reaches by transporting
When putting the inverting input terminal voltage for the comparator that OP2 and peripheral resistance are constituted, comparator output is positive, inverse conductivity type switching device
FET1 and inverse conductivity type switching device FET2 gate pole are applied forward voltage and are connected, and the charge on capacitor C1 is switched via inverse conductivity type
Device FET1 is quickly released, and capacitor C2 both end voltage declines immediately, simultaneously as the gate pole of inverse conductivity type switching device FET2
It is connected, in resistance R11 access circuit, the inverting input terminal voltage of comparator is dropped since resistance R11 and resistance R12 is in parallel
It is low.When the voltage on capacitor C2 is reduced to it is also lower than the new inverting input terminal voltage of comparator when, the output end of comparator becomes
It is 0, inverse conductivity type switching device FET1 and inverse conductivity type switching device FET2 gate pole turn off, and resistance R11 is cut off from circuit, while electricity
Hold C1 and stop electric discharge, starts to recharge.When charging voltage is higher than the inverting input terminal voltage of comparator, comparator output is
Just, capacitor C2 starts to discharge, and loops back and forth like this.Since the speed of capacitor C2 both end voltage rising is with the output of falling sinewave circuit
Voltage it is associated, voltage is higher, and capacitor charging is faster, therefore as capacitor C2 is periodically charged and discharged, the both ends capacitor C2
It is formed with falling the triangular carrier that sine wave matches.
The present invention has built the carrier generating circuit of pulse frequency modulated using hardware circuit, and generally uses microcontroller
It compares, cost of the invention is simpler, and since frequency changes, hardware circuit designed by the present invention reduces EMI, together
When, carrier frequency is low when the sinewave circuit that the present invention uses makes voltage high, reduces the loss of switching device.The present invention
Reduce the cost realized using controller and algorithm, hardware circuit is simple, there is certain application value
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (2)
1. a kind of carrier generating circuit of pulse frequency modulated, which is characterized in that electricity occurs including falling sinewave circuit and carrier wave
Road；The output end of the sinewave circuit generates sine wave, and carrier generating circuit is passed in the conduct of falling sine wave input,
Carrier generating circuit generates triangular wave corresponding with sine wave；
The sinewave circuit includes full-wave rectifying circuit and subtraction circuit, and full-wave rectifying circuit includes diode D1, two
Pole pipe D2 and capacitor C1, subtraction circuit include resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7
With amplifier OP1；Wherein:
The anode of diode D1 is connected with one end of ac power input end ACL and capacitor C1 respectively, the anode point of diode D2
It is not connected with the other end of ac power input end CAN and capacitor C1, the cathode of the diode D2 cathode with diode D1 respectively
It is connected with one end of resistance R1, the other end of resistance R1 is connected with one end of resistance R2 and resistance R6 respectively, and resistance R2's is another
End ground connection, an end of resistance R3 are connected to 15V voltage, and the other end of resistance R3 is connected with one end of resistance R4 and resistance R5 respectively,
The other end of resistance R4 is grounded, and another non-inverting input terminal for terminating to amplifier OP1 of resistance R5, the another of resistance R6 terminates to fortune
The reverse input end of OP1 is put, and is connected with one end of resistance R7, amplifier OP1 connects 15V voltage, the output end and resistance of amplifier OP1
The other end of R7 is connected.
2. a kind of carrier generating circuit of pulse frequency modulated according to claim 1, which is characterized in that the carrier wave hair
Raw circuit include voltage-stabiliser tube ZD1, triode TR1, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13,
Resistance R14, resistance R15, capacitor C2, inverse conductivity type switching device FET1, inverse conductivity type switching device FET2 and amplifier OP2；Wherein:
The cathode of voltage-stabiliser tube ZD1 is connected with the collector of the output end of amplifier OP1 and triode TR1 respectively, the sun of voltage-stabiliser tube ZD1
Pole is connected with the base stage of one end of resistance R8, triode TR1 respectively, the other end ground connection of resistance R8, the emitter of triode TR1
It is connected respectively with one end of one end of capacitor C2, the drain electrode of inverse conductivity type switching device FET1 and resistance R9, the other end of capacitor C2
Ground connection, the other end of resistance R9 are connected with one end of resistance R13, another non-inverting input terminal for terminating to amplifier OP2 of R13, electricity
An end of resistance R10 is connected to 15V voltage, the other end of resistance R10 one end phase with resistance R11, resistance R12 and resistance R14 respectively
Even, another drain electrode for terminating to inverse conductivity type switching device FET2 of resistance R11, the another of resistance R12 terminate to the anti-of amplifier OP2
Phase input terminal, the other end ground connection of resistance R14, amplifier OP2 connection 15V voltage, the output end of amplifier OP2 and the one of resistance R15
End is connected, the other end of the resistance R15 door with the gate pole of inverse conductivity type switching device FET1 and inverse conductivity type switching device FET2 respectively
Extremely it is connected, the source electrode of the source electrode of inverse conductivity type switching device FET1 and inverse conductivity type switching device FET2 are grounded, and the both ends of capacitor C2 are made
For the output end of entire carrier generating circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610651536.9A CN106300958B (en) | 2016-08-10 | 2016-08-10 | A kind of carrier generating circuit of pulse frequency modulated |
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| CN201610651536.9A CN106300958B (en) | 2016-08-10 | 2016-08-10 | A kind of carrier generating circuit of pulse frequency modulated |
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| CN101404443A (en) * | 2008-06-05 | 2009-04-08 | 美芯晟科技（北京）有限公司 | Pulse-width modulator and boosting type converter employing the same |
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