CN109256976A - A kind of adjustable high-voltage pulse driving circuit of output waveform - Google Patents
A kind of adjustable high-voltage pulse driving circuit of output waveform Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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Abstract
The present invention provides a kind of adjustable high-voltage pulse driving circuits of output waveform, buck controller module including constant on-time and the constant current source module connecting with buck controller module.The buck controller module includes: on-off control circuit: being made of the 4th resistance, the 5th resistance and the second triode；Current limit adjusts circuit: by buck controller, high input voltage power filtering capacitor, third shunt capacitance, the 4th shunt capacitance, low ESR gate drivers partially installing capacitor, the 5th capacitor and second resistance are composed in parallel；Ripple configuration circuit: it by current sense resistor, PFET, decompression turn-on time and switching frequency setting resistance, power inductance, Schottky diode, is made of the 6th resistance, the 6th capacitor and the 9th capacitor；And accurate feedback resistance, output filter capacitor and filter capacitor.
Description
Technical field
The present invention relates to industrial inkjet three-dimensional printing technology field, especially a kind of adjustable high-voltage pulse of output waveform is driven
Dynamic circuit.
Background technique
Industrial inkjet three-dimensional printing technology has many advantages, such as that non-contact, efficient, adaptability for materials is wide, is current 3 D-printing
A kind of very important technology of industry.
For different printing binders, Industrial Printing head requires exploitation and tests a kind of wave for being most suitable for the binder
Shape, most buck controller all only generate a fixed output voltage, are not suitable for industrial inkjet applications, therefore waveform is adjustable
High-voltage pulse driving circuit need the adjustable function of output waveform.
Power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxygen
Change layer semiconductcor field effect transistor) belong to voltage-controlled device, when the voltage applied between its grid and source electrode is more than its door
When voltage limit, MOSFET will be connected.Since there are miller capacitances by MOSFET, so its charging process is non-linear process as schemed
3。
As shown in Fig. 2 is a kind of impulse waveform, t0-t1 this period, Slope Parameters of the pulse voltage to set
Rise, micro-strain occurs for the piezoelectric ceramic piece in spray head at this time.T1-t2 this period, it is applied to the pulse of piezoelectric ceramic piece
Voltage is maximum and keeps uniformly constant.T2-t3 this period, piezoelectric ceramic piece return to original state, generate a positive pressure at this time
Power comes out binder ink injection.
It is attached it is shown in Fig. 4 be adjusting and voltage-reduction switch power supply switching frequency and duty ratio and output electric current relationship waveform diagram,
Since power inductance has the function of energy storage, when switching node is in the conductive state, electric current linear rise is exported, in joint
When point is in close state, load current is provided by the energy that power inductance stores, and exports electric current linear decline at this time.
Summary of the invention
Goal of the invention: the technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of output wave
The adjustable high-voltage pulse driving circuit of shape.
In order to solve the above-mentioned technical problems, the present invention provides a kind of adjustable high-voltage pulse driving circuit of output waveform,
Buck controller module including constant on-time and the constant current source module being connect with buck controller module.
In the present invention, the buck controller module includes:
On-off control circuit: it is made of the 4th resistance, the 5th resistance and the second triode；
Current limit adjusts circuit: by buck controller, high input voltage power filtering capacitor, third shunt capacitance, the 4th
Shunt capacitance, low ESR gate drivers partially installing capacitor, the 5th capacitor and second resistance compose in parallel；
Ripple configuration circuit: electricity is arranged by current sense resistor, P-channel MOSFET, decompression turn-on time and switching frequency
Resistance, Schottky diode, is made of the 6th resistance, the 6th capacitor and the 9th capacitor power inductance；
And accurate feedback resistance, output filter capacitor and filter capacitor.
In the present invention, the 5th resistance first end ground connection, second end connects disconnected control signal end ShutDown_Ctrl；
The 4th resistance first end accesses on-off control signal end after terminating together with the 5th resistance second together
ShutDown_Ctrl, the 4th resistance second end are connect with the base stage of second triode；
The emitter of second triode is grounded, and collector is connect with the pin RT of the buck controller；
The high input voltage power filtering capacitor first end is connect with the pin VIN of the buck controller, the second termination
Ground；
The first end of the third shunt capacitance and the pin VIN connection of buck controller, second end ground connection；
The first end of 4th shunt capacitance is connect with the pin VIN of the buck controller, second end ground connection；
The pin VIN of the decompression turn-on time and switching frequency setting resistance first end and the buck controller connects
It connects, second end is connect with the collector of the pin RT of the buck controller and the triode；
The low ESR gate drivers partially installing capacitor first end is connect with the pin VIN of the buck controller, second end
It is connect with the pin VCC of the buck controller；
Pin with the buck controller after the 5th capacitor first end is connect with the first end of the second resistance
The pin after the 5th capacitor second end is connect with the second end of the second resistance with the buck controller is told in VIN connection
ADJ connection；
The current sense resistor first end is connect with the pin ISEN of the buck controller, second end and the decompression
The pin VIN connection of controller；
The grid of the P-channel MOSFET is connect with the pin PGATE of the buck controller, and source electrode and the decompression are controlled
The pin ISEN connection of device processed, drain electrode and the first end of the power inductance, the cathode of the Schottky diode and described the
The first end of six resistance connects；
The plus earth of the Schottky diode；
The 6th capacitor first end is connect with the first end of the second end of the 6th resistance and the 9th capacitor；
It is the second end of the power inductance and the 6th capacitor second end, the accurate feedback resistance first end, described
Output filter capacitor first end, filter capacitor first end connection；
The second end of the output filter capacitor and the filter capacitor is grounded；
The pin FB of the buck controller and the accurate feedback resistance second end, the 9th capacitor second end connect
It connects.
In the present invention, the constant current source module includes the 8th resistance, the 9th resistance, the tenth resistance, the tenth capacitor, the 11st
Capacitor, amplifier and third transistor；
The 8th resistance first end generates control signal end PWM_Ctrl with constant-current source and connect, second end and the described 9th
The first end of resistance is connect with the noninverting input of the first end of the 11st capacitor and told amplifier；
The 9th resistance second end ground connection；
The 11st capacitor second end ground connection；
The reverse input end of the tenth capacitor first end and the amplifier, with the third transistor emitter and with institute
State the connection of the tenth resistance first end, output end of the tenth capacitor second end with the base stage of the third transistor and with the amplifier
Connection；
The tenth resistance second end ground connection；
The pin FB connection of the third transistor collector and buck controller.
In the present invention, P-channel MOSFET gate drivers built in the buck controller.
In the present invention, the tenth resistance is precision resistance.
In the present invention, the reverse input end and output end flying capcitor of the amplifier.
The utility model has the advantages that the present invention provides a kind of adjustable high-voltage pulse driving circuit of output waveform, can output waveform can
The high-voltage pulse of tune, and at low cost, fast response time
Detailed description of the invention
The present invention is done with reference to the accompanying drawings and detailed description and is further illustrated, it is of the invention above-mentioned or
Otherwise advantage will become apparent.
Fig. 1 is the circuit diagram of high-voltage pulse driving circuit；
Fig. 2 is spray head wave file schematic diagram；
Fig. 3 is the charging process schematic diagram under MOSFET resistive load；
Fig. 4 is to flow through waveform diagram at the waveform and switching node of power inductor current.
Specific embodiment
It elaborates below in conjunction with attached drawing to the present invention.
The present invention provides a kind of adjustable high-voltage pulse driving circuit of output waveform, the decompression including constant on-time
Controller module 1 and the constant current source module 2 being connect with buck controller module 1.
Buck controller module 1 includes:
On-off control circuit: it is made of the 4th resistance R4, the 5th resistance R5 and the second triode Q2；
Current limit adjusts circuit: by buck controller U1, high input voltage power filtering capacitor C2, third shunt capacitance
C3, the 4th shunt capacitance C4, low ESR gate drivers partially installing capacitor C1, the 5th capacitor C5 and second resistance R2 are composed in parallel；
Ripple configuration circuit: it is set by current sense resistor R3, P-channel MOSFETQ1, decompression turn-on time and switching frequency
It sets resistance R1, power inductance L1, Schottky diode D1, be made of the 6th resistance R6, the 6th capacitor C6 and the 9th capacitor C9；
And accurate feedback resistance R7, output filter capacitor C7 and filter capacitor C8.In the present invention, PFET is P-channel
MOSFET。
5th resistance R5 first end ground connection, second end connect disconnected control signal end ShutDown_Ctrl；
The 4th resistance R4 first end accesses on-off control together and believes after terminating together with the 5th resistance R5 second
Number end ShutDown_Ctrl, the 4th resistance R4 second end connect with the base stage of the second triode Q2；
The emitter of the second triode Q2 is grounded, and collector is connect with the pin RT of the buck controller U1；
The high input voltage power filtering capacitor C2 first end is connect with the pin VIN of the buck controller U1, and second
End ground connection；
The first end of the third shunt capacitance C3 is connect with the pin VIN of buck controller U1, second end ground connection；
The first end of the 4th shunt capacitance C4 is connect with the pin VIN of the buck controller U1, second end ground connection；
The pin VIN of the decompression turn-on time and switching frequency setting resistance R1 first end and the buck controller U1
Connection, second end are connect with the collector of the pin RT of the buck controller U1 and the triode Q2；
The low ESR gate drivers partially installing capacitor C1 first end is connect with the pin VIN of the buck controller U1, the
Two ends are connect with the pin VCC of the buck controller U1；
The 5th capacitor C5 first end connect with the first end of the second resistance R2 after with the buck controller U1
Pin VIN connection, tell and controlled with the decompression after the 5th capacitor C5 second end is connect with the second end of the second resistance R2
The pin ADJ connection of device U1 processed；
The current sense resistor R3 first end is connect with the pin ISEN of the buck controller U1, second end with it is described
The pin VIN connection of buck controller U1；
The grid of the PFETQ1 is connect with the pin PGATE of the buck controller U1, and source electrode and the decompression control
The pin ISEN connection of device U1, drain electrode and the first end of the power inductance L1, the cathode of the Schottky diode D1 and institute
State the first end connection of the 6th resistance R6；
The plus earth of the Schottky diode D1；
The 6th capacitor C6 first end and the second end of the 6th resistance R6 and the first end of the 9th capacitor C9
Connection；
The second end of the power inductance L1 and the 6th capacitor C6 second end, the accurate feedback resistance R7 first
End, the connection of the output filter capacitor C7 first end, the filter capacitor C8 first end；
The second end of the output filter capacitor C7 and filter capacitor C8 is grounded；
The pin FB of the buck controller U1 and the precision feedback resistance R7 second end, the 9th capacitor C9 second
End connection.
Constant current source module 2 includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the tenth capacitor C10, the 11st electricity
Hold C11, amplifier U2A and third transistor Q3；
The 8th resistance R8 first end and constant-current source generate control signal end PWM_Ctrl and connects, second end and described the
The first end of nine resistance R9 is connect with the noninverting input of the first end of the 11st capacitor C11 and told amplifier U2A；
The 9th resistance R9 second end ground connection；
The 11st capacitor C11 second end ground connection；
The reverse input end of the tenth capacitor C10 first end and the amplifier U2A emit with the third transistor Q3
Pole and connect with the tenth resistance R10 first end, the base stage of the tenth capacitor C10 second end and the third transistor Q3 and with
The output end of the amplifier U2A connects；
The tenth resistance R10 second end ground connection；
The third transistor Q3 collector is connect with the pin FB of buck controller U1.
PFET gate drivers built in buck controller U1.
Tenth resistance R10 is precision resistance.
The reverse input end and output end flying capcitor C10 of amplifier U2A.
Pulse-width signal PWM_Ctrl limits amplifier U2A noninverting input most by the partial pressure clipping of R8 and R9
High voltage amplitude is R9/ (R9+R8) * UPWM_Ctrl, while the low pass R/C filters of R8 and C11 composition realize DAC digital-to-analogue conversion
Function, amplifier U2A realize voltage follow function, i.e., after the emitter voltage and DAC of triode Q3 load it is in the same direction in amplifier U2A
The voltage of input terminal is consistent, amplifier U2A noninverting input voltage U+=R9/ (R9+R8) * UPWM_Ctrl* Duty_Ratio, wherein
Duty_Ratio is the duty ratio of PWM_Ctrl signal.The emitter voltage of triode is the intrinsic reference electricity of buck controller U1
Vref is pressed, so output voltage UPHV_OUT=(R7/R10) * U++ Vref, therefore pass through the Duty_ of adjustment signal PWM_Ctrl
The i.e. adjustable U of Ratio+, to adjust output voltage UPHV_OUT。
In the present invention, the PFET gate driving opening time of the buck controller module of constant on-time is by the decompression
Turn-on time and switching frequency setting resistance R1 are configured.
The buck controller U1 of constant on-time has overheat, overcurrent protection.
The buck controller U1 of constant on-time can pass through the resistance R5, the resistance R4 and the triode Q2 group
At circuit shutdown.
Buck controller chip U1 has its internal reference voltage Vref.
Pulse voltage Vref≤PHV_OUT≤HV_IN of output.
The buck controller U1 of constant on-time passes through the R of the current sense resistor R3 or PFETQ1DS(on)
As over-current detection resistance.
Constant-current source drive module 2 is realized by the negative voltage feedback DAC circuit that amplifier forms.
The analog voltage of amplifier U2A noninverting input is made of the resistance R8, the resistance R9 and the capacitor C11
RC low-pass filtering and bleeder circuit realize.
Voltage pulse output UPHV_OUT=Vref+I*R7, wherein I is the constant current source module 2 electric current generated.
Specific such as Fig. 1, the present invention provide a kind of adjustable high-voltage pulse driving circuit of output waveform, comprising: constant to lead
The buck controller module 1 of logical time and the constant current source module being connect with the buck controller module 1 of the constant on-time
2；
The resistance R1 as the pull-up resistor of the buck controller U1 pin RT of the constant on-time be connected to through
The filtered high input voltage power supply of filter capacitor C2, and the buck controller U1's of the constant on-time is built-in
PFET gate driving circuit opening time is also set by the resistance R1.
Current-limiting resistance of the 4th resistance R4 as the second triode Q2 base stage, to limit the two or three pole
Pipe Q2 collector current further limits the electric current for flowing through the decompression turn-on time and switching frequency setting resistance R1, into
The power consumption of one step reduced on decompression turn-on time and switching frequency setting resistance R1.
The 5th resistance R5 resistance value is lower, so that in normal operation, it is ensured that in the environment of having noise jamming,
The second triode Q2 base stage maintains low level voltage, and the second triode Q2 maintains off state at this time, described constant to lead
The buck controller U1 of logical time is worked normally, and improves the anti-interference ability of circuit.
The low ESR gate drivers partially installing capacitor C1 has the function of noise filtering and stablizes VCC adjuster, is simultaneously
The gate drivers of the PFETQ1 provide surge current.
The third shunt capacitance C3 and the 4th shunt capacitance C4 is the buck controller of the constant on-time
The power pins VIN of U1 filters out noise jamming, improves chip operation stability.
The 5th capacitor C5 is in parallel with the second resistance R2, and limits together with the current sense resistor R3 negative
Current-carrying maximum value.
The effect of the 6th resistance R6, the 6th capacitor C6 and the 9th capacitor C9 are to compensate the constant conduction
The low ripple of the buck controller U1 of time exports, the 6th resistance R6 and the 6th capacitor C6 during circuit works by
In the PFETQ1 on-off charge and discharge can be carried out to the 6th resistance R6 and the 6th capacitor C6, it further can be at them
Sawtooth wave row, the decompression which passes through the capacitor C9 AC coupled to the constant on-time are generated at tie point
The FB pin of controller U1, to compensate the minimum ripple requirement of the pin.
The Schottky diode D1 as freewheeling diode and the power inductance L1, the output filter capacitor C7,
The output filter capacitor C8 provides output voltage during the buck controller U1 shutdown of the constant on-time together.
The 8th resistance R8 and the 9th resistance R9 forms potential-divider network, and it is same further to limit the amplifier U2A
To the voltage of input terminal, the 8th resistance R8 and the 11st capacitor C11 form RC low-pass filter circuit, which will count
Word pwm signal is converted to the voltage signal of simulation after RC is filtered.The cutoff frequency f of the RC low-pass filterC=1/2 π
R8C11, it is converted after analog voltage U=RDuty x R8/(R8+R9)x UPWM_Ctrl, wherein RDutyFor PWM_Ctrl signal
Duty ratio, UPWM_CtrlFor the voltage magnitude of PWM_Ctrl signal.
Amplifier output end voltage is further limited, and the output voltage is less than the decompression control of the constant on-time
Reference voltage Vref of the device U1 processed in pin FB.
The amplifier U2A and peripheral circuit constitute voltage follower, so that the emitter voltage of the third transistor Q3
Equal to the noninverting input of the amplifier U2A, since the duty ratio of PWM_Ctrol signal is continuously adjustable, this allows for described the
The voltage of three triode Q3 emitters is continuously adjustable, further emitter current Ie=U/R10, as long as WM_Ctrol signal
The constant then Ie of duty ratio is constant, thus output voltage UPHV_OUT=Ie*R7+Vref is constant.When needing to change output voltage, only
Need to adjust the duty ratio of PWM_Ctrol signal.Thereby realize the adjustable high-voltage pulse driving circuit of output waveform.
The present invention provides a kind of adjustable high-voltage pulse driving circuits of output waveform, implement the side of the technical solution
There are many method and approach, the above is only a preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
Also it should be regarded as protection scope of the present invention.All undefined components in this embodiment can be implemented in the prior art.
Claims (7)
1. a kind of adjustable high-voltage pulse driving circuit of output waveform, which is characterized in that the decompression control including constant on-time
Device module (1) processed and the constant current source module (2) being connect with buck controller module (1).
2. the adjustable high-voltage pulse driving circuit of a kind of output waveform according to claim 1, which is characterized in that the drop
Pressure controller module (1) includes:
On-off control circuit: it is made of the 4th resistance R4, the 5th resistance R5 and the second triode Q2；
Current limit adjusts circuit: by buck controller U1, high input voltage power filtering capacitor C2, third shunt capacitance C3, the
Four shunt capacitance C4, low ESR gate drivers partially installing capacitor C1, the 5th capacitor C5 and second resistance R2 are composed in parallel；
Ripple configuration circuit: electricity is arranged by current sense resistor R3, P-channel MOSFETQ1, decompression turn-on time and switching frequency
Resistance R1, it power inductance L1, Schottky diode D1, is made of the 6th resistance R6, the 6th capacitor C6 and the 9th capacitor C9；
And accurate feedback resistance R7, output filter capacitor C7 and filter capacitor C8.
3. the adjustable high-voltage pulse driving circuit of a kind of output waveform according to claim 1, which is characterized in that described
Five resistance R5 first ends ground connection, second end connect disconnected control signal end ShutDown_Ctrl；
The 4th resistance R4 first end accesses on-off control signal end after terminating together with the 5th resistance R5 second together
ShutDown_Ctrl, the 4th resistance R4 second end are connect with the base stage of the second triode Q2；
The emitter of the second triode Q2 is grounded, and collector is connect with the pin RT of the buck controller U1；
The high input voltage power filtering capacitor C2 first end is connect with the pin VIN of the buck controller U1, the second termination
Ground；
The first end of the third shunt capacitance C3 is connect with the pin VIN of buck controller U1, second end ground connection；
The first end of the 4th shunt capacitance C4 is connect with the pin VIN of the buck controller U1, second end ground connection；
The pin VIN of the decompression turn-on time and switching frequency setting resistance R1 first end and the buck controller U1 connect
It connects, second end is connect with the collector of the pin RT of the buck controller U1 and the triode Q2；
The low ESR gate drivers partially installing capacitor C1 first end is connect with the pin VIN of the buck controller U1, second end
It is connect with the pin VCC of the buck controller U1；
The 5th capacitor C5 first end is drawn after connecting with the first end of the second resistance R2 with the buck controller U1
Foot VIN connection, tell after the 5th capacitor C5 second end is connect with the second end of the second resistance R2 with the buck controller
The pin ADJ connection of U1；
The current sense resistor R3 first end is connect with the pin ISEN of the buck controller U1, second end and the decompression
The pin VIN connection of controller U1；
The grid of the P-channel MOSFETQ1 is connect with the pin PGATE of the buck controller U1, and source electrode and the decompression are controlled
The pin ISEN connection of device U1 processed, drain electrode and the first end of the power inductance L1, the Schottky diode D1 cathode and
The first end of the 6th resistance R6 connects；
The plus earth of the Schottky diode D1；
The 6th capacitor C6 first end is connect with the first end of the second end of the 6th resistance R6 and the 9th capacitor C9；
The second end of the power inductance L1 and the 6th capacitor C6 second end, the precision feedback resistance R7 first end, institute
State output filter capacitor C7 first end, filter capacitor C8 first end connection；
The second end of the output filter capacitor C7 and filter capacitor C8 is grounded；
The pin FB of the buck controller U1 and the precision feedback resistance R7 second end, the 9th capacitor C9 second end connect
It connects.
4. the adjustable high-voltage pulse driving circuit of a kind of output waveform according to claim 3, which is characterized in that the perseverance
Flowing source module 2 includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the tenth capacitor C10, the 11st capacitor C11, amplifier
U2A and third transistor Q3；
The 8th resistance R8 first end generates control signal end PWM_Ctrl with constant-current source and connect, second end and the 9th electricity
It hinders the first end of R9, connect with the noninverting input of the first end of the 11st capacitor C11 and told amplifier U2A；
The 9th resistance R9 second end ground connection；
The 11st capacitor C11 second end ground connection；
The reverse input end of the tenth capacitor C10 first end and the amplifier U2A, with the third transistor Q3 emitter and
Connect with the tenth resistance R10 first end, the base stage of the tenth capacitor C10 second end and the third transistor Q3 and with it is described
The output end of amplifier U2A connects；
The tenth resistance R10 second end ground connection；
The third transistor Q3 collector is connect with the pin FB of buck controller U1.
5. the adjustable high-voltage pulse driving circuit of a kind of output waveform according to claim 4, which is characterized in that the drop
P-channel MOSFET gate drivers built in pressure controller U1.
6. the adjustable high-voltage pulse driving circuit of a kind of output waveform according to claim 4, which is characterized in that described
Ten resistance R10 are precision resistance.
7. the adjustable high-voltage pulse driving circuit of a kind of output waveform according to claim 4, which is characterized in that the fortune
Put the reverse input end and output end flying capcitor C10 of U2A.
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| CN201811139972.3A CN109256976A (en) | 2018-09-28 | 2018-09-28 | A kind of adjustable high-voltage pulse driving circuit of output waveform |
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| CN201811139972.3A CN109256976A (en) | 2018-09-28 | 2018-09-28 | A kind of adjustable high-voltage pulse driving circuit of output waveform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113067991A (en) * | 2021-03-30 | 2021-07-02 | 中国科学院长春光学精密机械与物理研究所 | Self-defined waveform driving circuit |
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Application publication date: 20190122 |