CN108712061B - A kind of current-mode power driving circuit - Google Patents
A kind of current-mode power driving circuit Download PDFInfo
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- CN108712061B CN108712061B CN201810382772.4A CN201810382772A CN108712061B CN 108712061 B CN108712061 B CN 108712061B CN 201810382772 A CN201810382772 A CN 201810382772A CN 108712061 B CN108712061 B CN 108712061B
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Classifications
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/081—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source
- H02M1/082—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The present invention provides a kind of current-mode power driving circuit, including resistance R1, chip U1 and peak point current wave filtering circuit, one end of resistance R1 is connected to the error amplifier output compensation pin of chip U1, the pwm pulse signal that the other end connection external drive signal source of resistance R1 generates;The synchronization pulse that the synchronization signal input pin connection external drive signal source of chip U1 generates;The peak point current of the input terminal sampling external switch pipe of peak point current wave filtering circuit, is output to the current sampling input pin of chip U1 after filtering by the output end of peak point current wave filtering circuit;The output pin output drive signal driving external switch pipe of chip U1 turns on and off.The present invention, which is solved, designs Switching Power Supply using comparator, operational amplifier and traditional switching power source chip, is not easy the problem of meeting complicated application, reduces use cost.
Description
Technical field
The present invention relates to AC-DC, DC-DC circuit, in particular to by the digital power of digital programmable chip main control.
Background technique
Since Switching Power Supply is born, switch power technology passes through the continuous development in several stages, from discrete device to collection
The reliability of Switching Power Supply and volume production consistency is set to have obtained essential promotion at circuit, that has widened Switching Power Supply applies model
It encloses.With the expansion of Switching Power Supply application range, in the high dynamic in face of communication and industry control industry, exposure when high impact-resistant loads
The shortcoming of voltage mode control Switching Power Supply out, switch power high-frequency transformer easy bias, saturation when using, causes to switch
Power supply is easy to damage, and reliability is nothing like linear power supply and Industrial Frequency Transformer.Although solving switch electricity by increasing capacitance
Easy bias, saturation problem when source high frequency transformer uses, the Switching Power Supply in full input voltage range that works do not require nothing more than every
Directly capacitor is high pressure resistant, as the increase of Switching Power Supply power requires also increasingly the ripple current ability to bear of capacitance
Greatly, the cost of upper switch power supply is virtually greatly increased.
It is easy when perfectly solving switch power high-frequency transformer use after the Switching Power Supply of current control mode occurs
The shortcomings that saturation, the chip of current control mode when bias occurs in switch power high-frequency transformer, tends to be full or overloads output
Can Cycle by Cycle limit peak point current, effectively switch power high-frequency transformer is prevented to be saturated, eliminates capacitance and imitate
Fruit is better than capacitance, substantially increases the reliability of Switching Power Supply, also significantly reduces the cost of Switching Power Supply.
Nowadays with the high speed development of human civilization.Requirement of the people to Switching Power Supply further increases, and not only requires nothing more than
Switching Power Supply can export stable voltage, electric current and power, also require Switching Power Supply that can export electricity according to preset program
Pressure, electric current and power, or even Switching Power Supply is required according to conditions present automatic identification and corresponding voltage, electric current can be exported
With power, in order to reach such requirement, if still set using comparator, operational amplifier and traditional switching power source chip
Count Switching Power Supply, not only design and its complicated, be not easy debugging production, can not flexible, lead to poor universality.
The development that digital programmable chip technology and mechanics of communication are leaped since new century, digital programmable chip
It has penetrated into each of life corner, small to one mini light night and has arrived automobile, train greatly.Digital programmable chip technology with
Mechanics of communication is ubiquitous.The high-speed figures such as DSP, FPGA, which may be programmed core, can satisfy being required for digital switch power supply, but
It is that its cost is very high, requires programming technique high, the unsuitable middle low power of system complex and the lower inexpensive number of added value
Word power supply.
Summary of the invention
In view of this, using comparator, operational amplifier and traditional switching power source chip the invention solves above-mentioned
Switching Power Supply is designed, is not easy to meet complicated application, may be programmed core design digital switch electricity using high-speed figures such as DSP, FPGA
Source, at high cost, high to programming technique requirement, system complex.
A kind of current-mode power driving circuit, including resistance R1, chip U1 and peak point current wave filtering circuit, resistance
One end of R1 is connected to the error amplifier output compensation pin of chip U1, and the other end of resistance R1 connects external drive signal source
The pwm pulse signal of generation;The lock-out pulse letter that the synchronization signal input pin connection external drive signal source of chip U1 generates
Number;The peak point current of the input terminal sampling external switch pipe of peak point current wave filtering circuit, passes through peak value electricity after filtering
The output end of stream wave filtering circuit is output to the current sampling input pin of chip U1;The output pin output driving of chip U1
Signal driving external switch pipe turns on and off.
It preferably, further include capacitor C1, the synchronization signal input pin of chip U1 connects one end of capacitor C1, capacitor C1's
The other end connect external drive signal source generate pwm pulse signal, pwm pulse signal after capacitor C1, can produce with
The synchronous signal of pwm pulse signal, instead of synchronization pulse.
Preferably, peak point current wave filtering circuit includes resistance R3, resistance R4 and capacitor C2, one end connection of resistance R3
One end of resistance R4 and input terminal as peak point current wave filtering circuit, the other end ground connection of resistance R3, resistance R4's is another
One end connects one end of capacitor C2 and the output end as peak point current wave filtering circuit, the other end ground connection of capacitor C2.
It preferably, further include a discharge circuit, the synchronization signal input that the discharge circuit is connected to chip U1 is drawn
Between foot and ground, a discharge loop is provided for capacitor C1.
Preferably, the discharge loop includes resistance R2, the synchronization signal input of one end connection chip U1 of resistance R2
The other end of pin, resistance R2 connects ground.
Preferably, the discharge loop includes diode D1, the synchronization signal of the cathode connection chip U1 of diode D1
Input pin, the plus earth of diode D1.
The object of the present invention is achieved like this, and the signal of source driving signal is input to U1 as input circuit by resistance R1
(UC3843B) Compensation pin.C1 is input to U1 as synchronous signal input circuit, by the signal of source driving signal
(UC3843B) R T/CT pin is to synchronize the oscillator (Oscillator) of U1 (UC3843B), and R2 and D1 are as auxiliary circuit
The oscillator (Oscillator) of U1 (UC3843B) synchronous with C1.R3, R4, C2 constitute current sample filter circuit, to switch
Power supply carries out sampling filter by the current signal of switching tube and is input to the Current Sense pin of U1 (UC3843B).
The Output pin of U1 (UC3843B) drives MOSFTE or IGBT as output.
Since the name of chip pin is not sought unity of standard, the synchronization signal input pin of U1 is in other models in the present invention
Chip in, can also be defined as timing pin, the effect of timing pin is also the oscillator inside synchronizing chip, is only named not
Together, played the role of identical as the synchronization signal input pin of U1 of the invention, equally fall into protection scope of the present invention.
It is characterized by:
In above-described circuit, peripheral cell is few, includes R1, R2, R3, R4, C1, C2, D1, U1, altogether 8 members
Part makes full use of the circuit inside U1 to reach the cost drive circuit for realizing current control mode, utilizes 8 single-chip microcontrollers, 16
The low-cost chips such as position single-chip microcontroller, ARM architecture digital programmable chip cooperate driving circuit composition digital power that can have
Cycle by Cycle current control mode function, while having both low cost, high flexibility, the digital power with communication function.
Detailed description of the invention
Fig. 1 is that invention applies the circuit diagram in flyback topologies structure;
Fig. 2 is second system Solution Embodiments functional block diagram of the present invention;
Fig. 3 is first embodiment of the invention circuit diagram;
Fig. 4 is second embodiment of the invention circuit diagram;
Fig. 5 is third embodiment of the invention circuit diagram;
Fig. 6 is fourth embodiment of the invention circuit diagram;
Fig. 7 is fifth embodiment of the invention circuit diagram;
Fig. 8 is the circuit working waveform figure of first embodiment of the invention.
Specific embodiment
First embodiment
Fig. 1 is that the present invention applies the circuit diagram in flyback topologies structure, specifically includes rectifying and wave-filtering in Fig. 1, opens
The flyback topologies main circuit of the circuits group such as dynamic circuit, T1, D2, D3, CE1, CE2, CE3, L1, Q1 further includes output voltage isolation
Sampling, source driving signal, further include current-mode of the present invention power driving circuit, output voltage be isolated sample circuit
Function be output voltage sampling, send source driving signal for output voltage signal.The core of source driving signal is single-chip microcontroller
Or ARM architecture digital programmable chip, the output voltage signal sent to output voltage isolation sample circuit carry out sample quantization
Handle and compared with set output voltage values, output pwm pulse signal.
Fig. 2 is that the present invention applies the circuit diagram in another flyback topologies structure, specifically comprising rectifying filter in Fig. 2
The flyback topologies main circuit of the circuits group such as wave, start-up circuit, T1, D2, D3, CE1, CE2, CE3, CE4, D4, L1, Q1 further includes
High speed photo coupling, source driving signal, further include current-mode of the present invention power driving circuit, it is different from a kind of upper application
Point is that source driving signal (single-chip microcontroller or ARM architecture digital programmable chip) is placed in the outlet side of flyback topologies, can be directly right
Output voltage carries out sample quantization processing and compared with setting output voltage values, exports pwm pulse signal.Fig. 2 high speed light
Coupling, function are that the pwm pulse signal for issuing source driving signal passes to driving signal input circuit and synchronization signal input electricity
Road.
A kind of power driving circuit of current-mode of the present invention, as shown in figure 3, include resistance R1, chip U1 and
Peak point current wave filtering circuit, peak value electricity of the peak point current wave filtering circuit to switching tube in external flyback topology circuit
Stream carries out sampling filter, and switching tube peak-current signal is input to the 3rd foot of U1, i.e. current sampling input pin pin.It should
The major function of the power driving circuit of current-mode is the switching tube Q1 driven in external flyback topology circuit, and according to peak
The peak-current signal for being worth the acquisition of current sample filter circuit realizes Cycle by Cycle control switch pipe peak point current, makes system embodiment party
Case has the characteristics of current control mode.
Connection relationship are as follows: one end of resistance R1 is connected to the 1st foot of chip U1, i.e. error amplifier exports compensation pin,
The pwm pulse signal that the other end connection external drive signal source of R1 generates;The input of the 4th foot of chip U1, i.e. synchronization signal is drawn
Foot (or can also be named as timing pin) connects the synchronization pulse that external drive signal source generates;Peak point current sampling
The peak point current of the input terminal sampling external switch pipe of filter circuit, passes through the output of peak point current sample circuit after filtering
End is output to the 3rd foot of chip U1, i.e. current sampling input pin;The 6th foot of chip U1, i.e. output pin output drive signal
Driving external switch pipe turns on and off.
Peak point current wave filtering circuit includes resistance R3, resistance R4 and capacitor C2, and one end of resistance R3 connects resistance R4
One end and input terminal as peak point current wave filtering circuit, the other end ground connection of resistance R3, the other end of resistance R4 connect
Connect one end of capacitor C2 and the output end as peak point current wave filtering circuit, the other end ground connection of capacitor C2.
The operation principle of the present invention is that: (1) in Fig. 8 T0~T1 moment, when source driving signal output pwm pulse signal is low
When level, the 1st pin of U1 is low level, if U1 error amplifier exports compensation pin waveform T0~T1 moment in Fig. 8, at this time
The 6th pin of U1, i.e. output pin output drive signal low level, such as U1 output pin waveform T0~T1 moment in Fig. 8.It opens outside
It is in an off state to close pipe.
(2) T1~T2 moment in Fig. 8, when source driving signal output pwm pulse signal is high level, the 1st pin of U1 is
High level, amplitude 5V, if U1 error amplifier exports the compensation pin waveform T1 moment in Fig. 8, the 4th pin of U1 at this time, i.e., together
Walk signal input pin, incoming sync pulse signal high level, such as U1 synchronization signal input pin waveform T1 moment, arteries and veins in Fig. 8
Rushing amplitude is less than or equal to 5V.The 6th pin of U1 at this time, i.e. output pin output drive signal high level, as U1 output is drawn in Fig. 8
The foot waveform T1 moment.External switch pipe is in the conductive state, and the input terminal of peak point current wave filtering circuit samples external switch
The peak point current of pipe is output to the 3rd foot of chip U1, i.e. electric current after filtering by the output end of peak point current sample circuit
Input pin is sampled, at this time the 3rd foot of U1, i.e., the input of U1 current sampling is drawn in current sampling input pin input waveform such as Fig. 8
Foot waveform T1 moment, amplitude are less than 1V.Until the T2 moment, source driving signal exports pwm pulse signal when being low level, and the of U1
1 pin is low level, if U1 error amplifier exports the compensation pin waveform T2 moment in Fig. 8, via U1 internal circuit by U1's
1st pin, i.e. error amplifier export the 3rd pin of compensation pin signal and U1, i.e. current sampling input pin signal, compare
The 6th foot of U1, i.e. output pin output drive signal low level are driven afterwards, and external switch pipe becomes an OFF state at this time, and waveform is such as
U1 output pin waveform T2 moment, this end cycle in Fig. 8.
(3) T2~T3 moment in Fig. 8, when source driving signal output pwm pulse signal is low level, the 1st pin of U1
For low level, if U1 error amplifier exports compensation pin waveform T2~T3 moment in Fig. 8, the 6th pin of U1, i.e. output are drawn at this time
Foot output drive signal low level, such as U1 output pin waveform T2~T3 moment in Fig. 8.External switch pipe is in an off state.
(4) T3~T4 moment in Fig. 8, when source driving signal output pwm pulse signal is high level, the 1st pin of U1 is
High level, amplitude 5V, if U1 error amplifier exports the compensation pin waveform T3 moment in Fig. 8, the 4th pin of U1 at this time, i.e., together
Walk signal input pin, incoming sync pulse signal high level, such as U1 synchronization signal input pin waveform T3 moment, arteries and veins in Fig. 8
Rushing amplitude is less than or equal to 5V.The 6th pin of U1 at this time, i.e. output pin output drive signal high level, as U1 output is drawn in Fig. 8
The foot waveform T3 moment.External switch pipe is in the conductive state, and the input terminal of peak point current wave filtering circuit samples external switch
The peak point current of pipe is output to the 3rd foot of chip U1, i.e. electric current after filtering by the output end of peak point current sample circuit
Input pin is sampled, at this time the 3rd foot of U1, i.e., the input of U1 current sampling is drawn in current sampling input pin input waveform such as Fig. 8
The foot waveform T3 moment.Until the T4 moment is due to external switch tube current abnormal cause, lead to the 3rd foot of T4 moment U1, i.e. electric current
It samples input pin input signal and is greater than 1V, U1 current sampling input pin waveform T4 moment in waveform such as Fig. 8, inside U1
Circuit draws the 1st pin of U1, i.e. the 3rd pin of error amplifier output compensation pin signal and U1, i.e. current sampling input
Foot signal drives the 6th foot of U1, i.e. output pin output drive signal low level more afterwards, and external switch pipe becomes turning off at this time
The U1 output pin waveform T4 moment in state, waveform such as Fig. 8.
(5) T4~T5 moment in Fig. 8, until the T5 moment, when source driving signal output pwm pulse signal is low level, U1
The 1st pin be low level, as in Fig. 8 U1 error amplifier export the compensation pin waveform T5 moment, this end cycle.
Second embodiment
Fig. 4 is second embodiment of the invention circuit diagram as a kind of improvement to first embodiment and increases capacitor
One end of the 4th foot connection capacitor C1 of C1, chip U1, the PWM arteries and veins that the other end connection external drive signal source of capacitor C1 generates
Rush signal.The effect of capacitor C1 herein is to replace source driving signal output sync pulse signal, exports PWM from source driving signal
Take a pulse signal synchronous with pwm pulse signal to the oscillator inside U1 in pulse signal.
3rd embodiment
Fig. 5 is that the circuit diagram of third embodiment of the invention increases resistance R2 unlike second embodiment,
The 4th foot of one end connection chip U1 of R2, the other end of R2 connect ground.The effect of resistance R2 is that an electric discharge is provided to capacitor C1
Circuit, in the higher situation of frequency, if without this discharge loop, the phenomenon that pulse-losing can be generated.Other work are former
Reason is identical with the first embodiment, and details are not described herein.
Fourth embodiment
Fig. 6 is the circuit diagram of fourth embodiment of the invention, is different from the third embodiment, increases diode
The 4th foot of the cathode connection chip U1 of D1, D1, the plus earth of D1.The effect of D1 is also to provide one to capacitor C1 to discharge back
Road, in the higher situation of frequency, if without this discharge loop, the phenomenon that pulse-losing can be generated.Other working principles
It is identical with the first embodiment, details are not described herein.Other, which are able to achieve, is also applied for this for the C1 discharge circuit for providing discharge loop
Invention.
5th embodiment
Fig. 7 is the circuit diagram of fifth embodiment of the invention, and fourth embodiment is to implement 3rd embodiment and the 4th
Example combines utilization, and discharge effect is more preferably.
The invention discloses a kind of suitable single-chip microcontroller, the digital power driving circuit of ARM digital programmable chip main control,
Single-chip microcontroller or ARM architecture digital programmable chip are solved in the practical limitation of Switching Power Supply industry, passes through peripheral driver electricity
Road auxiliary has broken single-chip microcontroller or ARM architecture digital programmable chip is unsatisfactory for the real-time of electric current loop in digital switch power supply
Property.To be several times lower than compared to the price using single-chip microcontroller for DSP and FPGA or ARM architecture digital programmable chip to tens times,
Greatly reduce the cost of digital switch power supply.
Claims (6)
1. a kind of current-mode power driving circuit, it is characterised in that: including resistance R1, chip U1 and peak point current sampling filter
Circuit, one end of resistance R1 are connected to the error amplifier output compensation pin of chip U1, and the other end of resistance R1 connects external
The pwm pulse signal that source driving signal generates;What the synchronization signal input pin connection external drive signal source of chip U1 generated
Synchronization pulse, the peak point current of the input terminal sampling external switch pipe of peak point current wave filtering circuit, after filtering
The current sampling input pin of chip U1 is output to by the output end of peak point current wave filtering circuit;The output of chip U1 is drawn
Foot output drive signal driving external switch pipe turns on and off.
2. a kind of current-mode power driving circuit according to claim 1, it is characterised in that: peak point current sampling filter
Circuit includes resistance R3, resistance R4 and capacitor C2, and one end of one end connection resistance R4 of resistance R3 is simultaneously sampled as peak point current
The input terminal of filter circuit, the other end ground connection of resistance R3, the other end of resistance R4 connect one end of capacitor C2 and as peak values
The output end of current sample filter circuit, the other end ground connection of capacitor C2.
3. a kind of current-mode power driving circuit according to claim 2, it is characterised in that: further include capacitor C1, core
One end of the synchronization signal input pin connection capacitor C1 of piece U1, what the other end connection external drive signal source of capacitor C1 generated
Pwm pulse signal.
4. a kind of current-mode power driving circuit according to claim 3, it is characterised in that: further include an electric discharge electricity
Road, the discharge circuit are connected between the synchronization signal input pin of chip U1 and ground, provide an electric discharge for capacitor C1
Circuit.
5. a kind of current-mode power driving circuit according to claim 4, it is characterised in that: the discharge loop packet
Resistance R2, the synchronization signal input pin of one end connection chip U1 of resistance R2 are included, the other end of resistance R2 connects ground.
6. a kind of current-mode power driving circuit according to claim 4 or 5, it is characterised in that: the electric discharge is returned
Road includes diode D1, the synchronization signal input pin of the cathode connection chip U1 of diode D1, the plus earth of diode D1.
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CN201810382772.4A CN108712061B (en) | 2018-04-24 | 2018-04-24 | A kind of current-mode power driving circuit |
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CN201810382772.4A CN108712061B (en) | 2018-04-24 | 2018-04-24 | A kind of current-mode power driving circuit |
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CN107769531A (en) * | 2016-08-20 | 2018-03-06 | 王艺霖 | A kind of RFID reader flyback power supply modular circuit |
CN107947549A (en) * | 2017-12-07 | 2018-04-20 | 绵阳高新区经纬达科技有限公司 | A kind of protective circuit of switch power source based on UC3842 |
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