CN108712061A - A kind of current-mode power driving circuit - Google Patents
A kind of current-mode power driving circuit Download PDFInfo
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- CN108712061A CN108712061A CN201810382772.4A CN201810382772A CN108712061A CN 108712061 A CN108712061 A CN 108712061A CN 201810382772 A CN201810382772 A CN 201810382772A CN 108712061 A CN108712061 A CN 108712061A
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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 of the other end connection external drive signal source generation of resistance R1；The synchronization pulse that the synchronizing 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 by the output end of peak point current wave filtering circuit after filtered；The output pin output drive signal driving external switch pipe of chip U1 turns on and off.The present invention solves the problem of being designed Switching Power Supply with traditional switching power source chip using comparator, operational amplifier, be not easy to meet complicated application, reduces use cost.
Description
Technical field
The present invention relates to AC-DC, DC-DC circuits, more particularly to by the digital power of digital programmable chip main control.
Background technology
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 is set to have obtained essential promotion with volume production consistency at circuit, that has widened Switching Power Supply applies model
It encloses.With the expansion of Switching Power Supply application range, in face of communicating the high dynamic with industry control industry, high impact-resistant exposes when loading
Go out the shortcoming of voltage mode control Switching Power Supply, switch power high-frequency transformer easy magnetic bias, saturation when using cause to switch
Power supply is fragile, and reliability is nothing like linear power supply and Industrial Frequency Transformer.Although solving switch electricity by increasing capacitance
Source high frequency transformer easy magnetic bias, saturation problem when using, the Switching Power Supply being operated in full input voltage range do not require nothing more than every
The high pressure of straight capacitance requires also increasingly the ripple current ability to bear of capacitance with the increase of Switching Power Supply power
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 magnetic 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 is leaped with mechanics of communication since new century, digital programmable chip
Each corner in life is penetrated into, small to one mini light night arrives greatly automobile, train.Digital programmable chip technology with
Mechanics of communication is ubiquitous.The high-speed figures such as DSP, FPGA may be programmed core and disclosure satisfy that 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.
Invention content
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, of 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 synchronizing 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 filtered
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.
Preferably, further include capacitance C1, one end of the synchronizing signal input pin connection capacitance C1 of chip U1, capacitance C1's
The other end connect external drive signal source generate pwm pulse signal, pwm pulse signal after capacitance C1, can generate with
The signal that pwm pulse signal synchronizes, instead of synchronization pulse.
Preferably, peak point current wave filtering circuit includes resistance R3, resistance R4 and capacitance C2, one end connection of resistance R3
One end of resistance R4 and as the input terminal of peak point current wave filtering circuit, the other end of resistance R3 is grounded, and resistance R4's is another
One end connects one end of capacitance C2 and as the output end of peak point current wave filtering circuit, and the other end of capacitance C2 is grounded.
Preferably, further include a discharge circuit, the synchronizing signal input that the discharge circuit is connected to chip U1 is drawn
Between foot and ground, a discharge loop is provided for capacitance C1.
Preferably, the discharge loop includes resistance R2, the synchronizing signal input of one end connection chip U1 of resistance R2
Pin, the other end connection ground of resistance R2.
Preferably, the discharge loop includes diode D1, the synchronizing 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 by resistance R1 as input circuit
(UC3843B) Compensation pins.C1 is input to U1 as synchronous signal input circuit, by the signal of source driving signal
(UC3843B) R T/C T pins are to synchronize the oscillator (Oscillator) of U1 (UC3843B), and R2 and D1 is as auxiliary electricity
The oscillator (Oscillator) of road U1 (UC3843B) synchronous with C1.R3, R4, C2 constitute current sample filter circuit, split
Drawn by the Current Sense that the current signal of switching tube carries out sampling filter and is input to U1 (UC3843B) in powered-down source
Foot.The Output pins of U1 (UC3843B) drive MOSFTE or IGBT as output.
Since the name of chip pin is not sought unity of standard, the synchronizing 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 with the present invention the synchronizing signal input pin of U1 it is identical, equally fall into protection scope of the present invention.
It is characterized in that：
In above-described circuit, peripheral cell is few, including R1, R2, R3, R4, C1, C2, D1, U1,8 members altogether
Part makes full use of the circuit inside U1 to reach the cost drive circuit for realizing current control mode, utilizes 8 microcontrollers, 16
The low-cost chips such as position microcontroller, ARM architecture digital programmable chips coordinate 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.
Description of the drawings
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 implementation mode
First embodiment
Fig. 1 is that the present invention applies the circuit diagram in flyback topologies structure, includes specifically 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, output voltage signal is sent to source driving signal.The core of source driving signal is microcontroller
Or ARM architecture digital programmable chips, the output voltage signal sent to output voltage isolation sample circuit carry out sample quantization
It handles and compared with setting output voltage values, exports pwm pulse signal.
Fig. 2 is that the present invention applies the circuit diagram in another flyback topologies structure, is specifically filtered comprising rectification 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 optocoupler, 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 (microcontroller or ARM architecture digitals 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
Lotus root, function are that the pwm pulse signal that source driving signal is sent out is passed to drive signal input circuit and synchronizing signal input electricity
Road.
A kind of power driving circuit of current-mode of the present invention, as shown in figure 3, including 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 topologies 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 in the external flyback topological circuit of driving, and according to peak
The peak-current signal for being worth the acquisition of current sample filter circuit realizes that Cycle by Cycle controls switching tube peak point current, makes system embodiment party
Case has the characteristics of current control mode.
Connection relation is：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. synchronizing 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 samples
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 filtered
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 capacitance C2, one end connection resistance R4 of resistance R3
One end and as the input terminal of peak point current wave filtering circuit, the other end of resistance R3 is grounded, and the other end of resistance R4 connects
It connects one end of capacitance C2 and as the output end of peak point current wave filtering circuit, the other end of capacitance C2 is grounded.
The operation principle of the present invention is that：(1) T0~T1 moment in Fig. 8, when source driving signal output pwm pulse signal is low
When level, the 1st pin of U1 is low level, if U1 error amplifiers export compensation pin waveform T0~T1 moment in Fig. 8, at this time
The 6th pins of U1, i.e. output pin output drive signal low level, such as U1 output pins waveform T0~T1 moment in Fig. 8.It opens outside
It closes pipe and is off state.
(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 amplifiers export the compensation pin waveform T1 moment in Fig. 8, the 4th pins of U1 at this time, i.e., together
Walk signal input pin, incoming sync pulse signal high level, such as U1 synchronizing signals input pin waveform T1 moment, arteries and veins in Fig. 8
It is less than or equal to 5V to rush amplitude.The 6th pins of U1 at this time, i.e. output pin output drive signal high level, as U1 outputs are drawn in Fig. 8
The foot waveform T1 moment.External switch pipe is in the conduction 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 by the output end of peak point current sample circuit after filtered
Input pin is sampled, at this time the 3rd foot of U1, i.e., U1 current samplings input and draw 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 amplifiers export the compensation pin waveform T2 moment in Fig. 8, via U1 internal circuits 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 feet 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 pins 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 amplifiers export compensation pin waveform T2~T3 moment in Fig. 8, the 6th pins of U1, i.e. output at this time is drawn
Foot output drive signal low level, such as U1 output pins waveform T2~T3 moment in Fig. 8.External switch pipe is 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 amplifiers export the compensation pin waveform T3 moment in Fig. 8, the 4th pins of U1 at this time, i.e., together
Walk signal input pin, incoming sync pulse signal high level, such as U1 synchronizing signals input pin waveform T3 moment, arteries and veins in Fig. 8
It is less than or equal to 5V to rush amplitude.The 6th pins of U1 at this time, i.e. output pin output drive signal high level, as U1 outputs are drawn in Fig. 8
The foot waveform T3 moment.External switch pipe is in the conduction 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 by the output end of peak point current sample circuit after filtered
Input pin is sampled, at this time the 3rd foot of U1, i.e., U1 current samplings input and draw 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 more than 1V, the 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 feet 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 pins 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 amplifiers export the compensation pin waveform T5 moment, this end cycle.
Second embodiment
Fig. 4 is that second embodiment of the invention circuit diagram increases capacitance as a kind of improvement to first embodiment
One end of the 4th foot connection capacitance C1 of C1, chip U1, the PWM arteries and veins of the other end connection external drive signal source generation of capacitance C1
Rush signal.The effects of capacitance C1 herein are to replace source driving signal output sync pulse signal, and PWM is exported 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 connection ground of R2.The effect of resistance R2 is to provide an electric discharge to capacitance C1
Circuit, it is higher in frequency, if without this discharge loop, the phenomenon that will produce pulse-losing.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 capacitance C1 to discharge back
Road, it is higher in frequency, if without this discharge loop, the phenomenon that will produce pulse-losing.Other operation principles
It is identical with the first embodiment, details are not described herein.Other discharge circuits that can be embodied as C1 offer discharge loops are also applied for this
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 microcontroller, the digital power driving circuit of ARM digital programmable chip main controls,
It solves the practical limitation of microcontroller or ARM architecture digitals programmable chip in Switching Power Supply industry, passes through peripheral driver electricity
Road auxiliary has broken microcontroller or ARM architecture digitals programmable chip is unsatisfactory for the real-time of electric current loop in digital switch power supply
Property.To be several times lower than to tens times compared to the price using microcontroller for DSP and FPGA or ARM architecture digital programmable chips,
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
One end of circuit, resistance R1 is connected to the error amplifier output compensation pin of chip U1, and the other end connection of resistance R1 is external
The pwm pulse signal that source driving signal generates；What the synchronizing 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 filtered
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 capacitance C2, and one end of one end connection resistance R4 of resistance R3 is simultaneously sampled as peak point current
The other end of the input terminal of filter circuit, the other end ground connection of resistance R3, resistance R4 connects one end of capacitance C2 and as peak value
The output end of current sample filter circuit, the other end ground connection of capacitance C2.
3. a kind of current-mode power driving circuit according to claim 2, it is characterised in that：Further include capacitance C1, core
One end of the synchronizing signal input pin connection capacitance C1 of piece U1, the other end connection external drive signal source generation of capacitance C1
Pwm pulse signal.
4. a kind of current-mode power driving circuit according to claim 3, it is characterised in that：It further include an electric discharge electricity
Road, the discharge circuit are connected between the synchronizing signal input pin of chip U1 and ground, and an electric discharge is provided for capacitance C1
Circuit.
5. a kind of current-mode power driving circuit according to claim 4, it is characterised in that：The discharge loop packet
Include resistance R2, the synchronizing signal input pin of one end connection chip U1 of resistance R2, the other end connection ground of resistance R2.
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 synchronizing signal input pin of the cathode connection chip U1 of diode D1, the plus earth of diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810382772.4A CN108712061B (en) | 2018-04-24 | 2018-04-24 | A kind of current-mode power driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810382772.4A CN108712061B (en) | 2018-04-24 | 2018-04-24 | A kind of current-mode power driving circuit |
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| Publication Number | Publication Date |
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| CN108712061A true CN108712061A (en) | 2018-10-26 |
| CN108712061B CN108712061B (en) | 2019-11-22 |
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| CN201810382772.4A Active CN108712061B (en) | 2018-04-24 | 2018-04-24 | A kind of current-mode power driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669061A (en) * | 2019-01-31 | 2019-04-23 | 广州金升阳科技有限公司 | A kind of current sample compensation circuit |
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| CN203206556U (en) * | 2013-04-22 | 2013-09-18 | 昂宝电子（上海）有限公司 | DC-to-DC constant-current driving circuit |
| 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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2018
- 2018-04-24 CN CN201810382772.4A patent/CN108712061B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203206556U (en) * | 2013-04-22 | 2013-09-18 | 昂宝电子（上海）有限公司 | DC-to-DC constant-current driving circuit |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669061A (en) * | 2019-01-31 | 2019-04-23 | 广州金升阳科技有限公司 | A kind of current sample compensation circuit |
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| CN108712061B (en) | 2019-11-22 |
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