WO2009121296A1 - 一种梯形激励脉冲发生方法及装置 - Google Patents
一种梯形激励脉冲发生方法及装置 Download PDFInfo
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- WO2009121296A1 WO2009121296A1 PCT/CN2009/071118 CN2009071118W WO2009121296A1 WO 2009121296 A1 WO2009121296 A1 WO 2009121296A1 CN 2009071118 W CN2009071118 W CN 2009071118W WO 2009121296 A1 WO2009121296 A1 WO 2009121296A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/94—Generating pulses having essentially a finite slope or stepped portions having trapezoidal shape
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- the present invention relates to the field of waveform generation technologies, and in particular, to a ladder excitation pulse generation method and apparatus. Background technique
- the head module of a typical piezoelectric inkjet printhead is a piezoelectric device, and each nozzle of the nozzle is driven by a piece of piezoelectric ceramic.
- the excitation pulse voltage is applied to the corresponding piezoelectric ceramic piece at a controlled switching rate, the piezoelectric ceramic piece is excited outwardly to form a negative pressure wave, thereby sucking the ink into the chamber at a fixed pulse.
- the excitation pulse voltage is removed at a controlled slew rate.
- the total forward pressure wave propagates forward causing the nozzle to eject droplets.
- the excitation pulse voltage waveform applied to the actuator of the piezoelectric ceramic sheet to cause the deformation operation thereof is slightly different depending on the type of the nozzle, and the voltage waveform of a typical trapezoidal excitation pulse is as shown in Fig. 1.
- the trapezoidal excitation pulse can be described by four parameters: Fire Pulse Amplitude (FPA), Fire Pulse Width (FPW), Rise Time (RT), and Fall Time (Fall Time, FT). Among them, the four parameters of the trapezoidal excitation pulse will affect the initial velocity, volume and consistency of all the ink droplets ejected, which will ultimately affect the print quality.
- the most appropriate excitation pulse voltage waveform is applied to the printhead, requiring excitation pulses to be generated to drive the piezoelectric inkjet printhead.
- the system has flexible adjustability to the output excitation pulse waveform parameters, that is, the excitation pulse amplitude, excitation pulse width, rise time and fall time of the generated trapezoidal excitation pulse voltage waveform can be set in real time.
- the structure of the excitation pulse generation system needs to be as simple as possible while maintaining high precision.
- the structure of an excitation pulse generation system commonly used is as shown in the figure.
- the pulse amplitude control signal controls the voltage regulator to generate a high voltage direct current signal V+ that is consistent with the amplitude of the desired output excitation pulse, and outputs the excitation pulse to V+ or ground voltage through a switching action of the half bridge conversion circuit, thereby generating an excitation of the driving nozzle.
- Pulse voltage waveform signal The excitation pulse generation system can flexibly adjust the amplitude parameter of the generated excitation pulse, but it generates the excitation pulse.
- the structure of the excitation pulse generation system causes the excitation pulse waveform generated by it to fluctuate depending on the load, which has a certain influence on the final print quality. Summary of the invention
- the invention provides a method and a device for generating a trapezoidal excitation pulse, which are used for solving the fluctuation of the voltage waveform of the excitation pulse generated by the existing excitation pulse generation system because the rise time and the fall time may vary with the load of the excitation pulse generation system.
- the problem that ultimately affects the print quality of the inkjet printhead.
- the invention provides a trapezoidal excitation pulse generating device, comprising: a first single chip control unit, a positive voltage output dual channel digital-to-analog conversion unit, a negative voltage output dual-channel digital-to-analog conversion unit, a first analog switching unit and a first trapezoidal wave Generating unit;
- the first single chip control unit is configured to determine a negative DC control voltage signal voltage value according to a pulse amplitude parameter value of the trapezoidal excitation pulse of the desired output, and set a positive DC control voltage signal voltage value as a voltage signal voltage value, and set The negative DC control voltage signal voltage value is zero;
- the rising time DC control voltage signal voltage value is also determined according to the rising time parameter value of the trapezoidal excitation pulse of the desired output and the negative DC control voltage signal voltage value; or when the negative direct current is When the voltage value of the control voltage signal is zero, the rising time DC control voltage signal voltage value is determined according to the rising time parameter value of the trapezoidal excitation pulse and the positive DC control voltage signal voltage value;
- the voltage value of the positive DC control voltage signal is zero, the voltage value of the DC control voltage signal of the falling time is further determined according to the falling time parameter value of the trapezoidal excitation pulse of the desired output and the voltage value of the negative DC control voltage signal; or when negative When the voltage value of the DC control voltage signal is zero, determining the voltage value of the falling time DC control voltage signal according to the falling time parameter value of the trapezoidal excitation pulse of the desired output and the voltage value of the positive DC control voltage signal;
- the positive voltage output dual-channel digital-to-analog conversion unit is configured to perform digital-to-analog conversion of the received digital signal into a corresponding positive DC control voltage signal and a falling time DC control voltage signal; and the positive DC control voltage signal Inputting to the first analog switch unit; and inputting the falling time DC control voltage signal to the first trapezoidal wave generating unit;
- the negative voltage output dual-channel digital-to-analog conversion unit is configured to perform digital-to-analog conversion of the received digital signal into a corresponding negative DC control voltage signal and a rise time DC control voltage signal; and the positive DC control voltage signal Input to the first analog switch unit; and outputting the rise time DC control voltage signal to the first trapezoidal wave generating unit;
- the first analog switch unit is configured to modulate the positive DC control voltage signal and the negative DC control voltage signal into corresponding square wave pulses according to the input pulse width control signal and output to the first trapezoidal wave generation Unit
- the first trapezoidal wave generating unit is configured to generate and output a trapezoidal excitation pulse according to the input falling time DC control voltage signal, the rising time DC control voltage signal, and the square wave pulse.
- the invention also provides a trapezoidal excitation pulse generating device, comprising: a second single chip control unit, a positive voltage output dual channel digital-to-analog conversion unit, a negative voltage output dual-channel digital-to-analog conversion unit, a second analog switch unit and a second trapezoid Wave generating unit;
- the second single chip control unit is configured to determine a positive DC control voltage signal voltage value and a negative DC control voltage signal voltage value according to a pulse amplitude parameter value of the positive and negative trapezoidal excitation pulses required to be output; according to the positive and negative output of the required output a first falling time parameter value of the trapezoidal excitation pulse and the positive DC control voltage signal voltage value determining a voltage value of the falling time DC control voltage signal; or a second falling time of the positive and negative trapezoidal excitation pulses according to the desired output
- the parameter value and the negative DC control voltage signal voltage value determine a voltage value of the falling time DC control voltage signal;
- the positive voltage output dual-channel digital-to-analog conversion unit is configured to perform digital-to-analog conversion on the received digital signal, and convert the signal into a corresponding positive DC control voltage signal and a falling-time DC control voltage signal; and the positive DC control voltage signal Inputting to the second analog switch unit; inputting the falling time DC control voltage signal to the second trapezoidal wave generating unit;
- the negative voltage output dual-channel digital-to-analog conversion unit is configured to perform digital-to-analog conversion on the received digital signal, and convert the signal into a corresponding negative DC control voltage signal and a rise time DC control voltage signal; Writing a positive DC control voltage signal to the second analog switch unit; outputting the rise time DC control voltage signal to the second trapezoidal wave generating unit;
- the second analog switch unit is configured to modulate the positive DC control voltage signal, the negative DC control voltage signal, and the zero voltage signal into corresponding ones according to the input first pulse width control signal and the second pulse width control signal Positive and negative square wave pulses are output to the second trapezoidal wave generating unit;
- the second trapezoidal wave generating unit is configured to generate a positive and negative trapezoidal excitation pulse according to the input falling time DC control voltage signal, the rising time DC control voltage signal, and the positive and negative square wave pulses.
- a trapezoidal excitation pulse generating method includes: a signal voltage value, and setting a positive DC control voltage signal voltage value to zero; or, > determining a positive DC control voltage signal voltage value according to a pulse amplitude parameter value of the trapezoidal excitation pulse of the desired output And set the negative DC control voltage signal voltage value to zero;
- the positive DC control voltage signal and the negative DC control voltage signal are modulated into corresponding square wave pulses by using a pulse width control signal in the form of a square wave or a rectangular wave pulse;
- the rising time DC control voltage signal, the falling time DC control voltage signal, and the square wave pulse are input to a reverse integrator that forms a feedback loop by a double differential amplifying circuit, and a trapezoidal excitation pulse is generated and output.
- the invention provides a trapezoidal excitation pulse generating method and device, which respectively determine a voltage value of a positive DC control voltage signal, a negative DC control voltage signal voltage value and a rise time according to a parameter value of a trapezoidal excitation pulse of a desired output.
- DC control voltage signal voltage value and fall time DC control voltage signal voltage value generate corresponding DC control voltage signal according to the determined voltage value; use square wave or rectangular wave pulse pulse width control signal to be positive DC control
- the voltage signal and the negative DC control voltage signal are modulated into corresponding square wave pulses; the rising time DC control voltage signal, the falling time DC control voltage signal, and the square wave pulse input are formed by a double differential amplifier circuit to form a feedback loop reverse integrator, and generate The trapezoidal excitation pulse is output.
- the rise time and fall time of the trapezoidal excitation pulse have a specific quantitative relationship with the voltage value of the rising time DC control voltage signal and the voltage value of the falling time DC control voltage signal, respectively, the DC control voltage signal voltage is raised.
- the precise control and adjustment of the voltage value of the DC control voltage signal and the falling time can accurately control and adjust the rise time and fall time of the output trapezoidal excitation pulse, so that the output trapezoidal excitation pulse is more stable and accurate, avoiding
- the output trapezoidal excitation pulse waveform fluctuates due to the change of the load, and according to the input of different square wave pulse signals, different types of trapezoidal excitation pulses can be generated and output to meet different types.
- FIG. 2 is a schematic structural view of an excitation pulse generating system in the prior art
- FIG. 3 is a structural diagram of a trapezoidal excitation pulse generating apparatus according to Embodiment 1 of the present invention.
- 4 is an internal circuit diagram of a first trapezoidal wave generating unit according to Embodiment 1 of the present invention
- 5 is a comparison diagram of voltage waveforms of a pulse width control signal and a square wave pulse according to Embodiment 1 of the present invention
- FIG. 6 is a voltage waveform diagram corresponding to a rising time DC control voltage signal, a falling time DC control voltage signal, a square wave pulse, and a trapezoidal excitation pulse according to Embodiment 1 of the present invention
- FIG. 7 is a structural diagram of a trapezoidal excitation pulse generating apparatus according to Embodiment 2 of the present invention.
- FIG. 8 is a voltage waveform diagram corresponding to a first pulse width control signal, a second pulse width control signal, and positive and negative square wave pulses according to Embodiment 2 of the present invention
- FIG. 9 is a schematic diagram of voltage waveforms corresponding to positive and negative square wave pulses and positive and negative trapezoidal excitation pulses according to Embodiment 2 of the present invention.
- FIG. 10 is a flowchart of a method for generating a trapezoidal excitation pulse according to Embodiment 3 of the present invention
- FIG. 11 is a flowchart of a method for generating a trapezoidal excitation pulse according to Embodiment 4 of the present invention.
- Embodiment 1 is a diagrammatic representation of Embodiment 1:
- the first embodiment of the present invention provides a trapezoidal excitation pulse generating device, as shown in FIG. 3, comprising: a first single chip control unit 301, a positive voltage output dual channel digital-to-analog conversion unit 302, and a negative voltage output dual-channel digital-to-analog conversion unit. 303, a first analog switch unit 304 and a first trapezoidal wave generating unit 305; wherein:
- the first single chip control unit 301 is configured to determine a negative DC control voltage signal voltage value according to a pulse amplitude parameter value of the trapezoidal excitation pulse of the desired output, and set a positive DC control voltage signal voltage value as a voltage signal voltage value, and set a negative The DC control voltage signal voltage value is zero;
- the rise time DC control voltage is also determined according to the rise time parameter value of the trapezoidal excitation pulse and the negative DC control voltage signal voltage value of the desired output.
- Signal voltage value or when the negative DC control voltage signal voltage value is zero, the rise time DC control voltage signal voltage value is determined according to the rising time parameter value of the trapezoidal excitation pulse and the positive DC control voltage signal voltage value of the desired output.
- the falling time DC control voltage signal voltage value is also determined according to the falling time parameter value of the trapezoidal excitation pulse of the desired output and the negative DC control voltage signal voltage value; or when the negative DC control is performed When the voltage signal voltage value is zero, the falling time DC control voltage signal voltage value is determined according to the falling time parameter value of the trapezoidal excitation pulse of the desired output and the positive DC control voltage signal voltage value;
- the positive voltage output dual-channel digital-to-analog conversion unit 302 is configured to perform digital-to-analog conversion of the received digital signal into a corresponding positive DC control voltage signal and a falling-time DC control voltage signal; and input a positive DC control voltage signal to the first An analog switch unit 304; and the fall time DC control voltage signal is input to the first trapezoidal wave generating unit 305;
- the negative voltage output dual-channel digital-to-analog conversion single 303 is used for digital-to-analog conversion of the received digital signal, and converted into a corresponding negative DC control voltage signal and a rise time DC control voltage signal; and the negative DC control voltage signal is input to the first An analog switch unit 304; and output the rise time DC control voltage signal to the first trapezoidal wave generating unit 305;
- the first analog switch unit 304 is configured to modulate the positive DC control voltage signal or the negative DC control voltage signal into a corresponding square wave pulse according to the input pulse width control signal and output to the first trapezoidal wave generating unit 305;
- the trapezoidal excitation pulse generating device may further include: a linear power amplifying unit 306 for integers to be used.
- the first trapezoidal wave generating unit of the trapezoidal excitation pulse generating device is a reverse integrator of a feedback loop formed by a double differential amplifying circuit.
- the internal circuit includes: an integral operating circuit and a double differential amplifying circuit;
- the integral operation circuit comprises: a resistor R1, a resistor R2, an operational amplifier U1 and a feedback capacitor C1; wherein the resistor R1 is connected in series with R2, the resistor R1 is connected to the input terminal 1 of the square wave pulse, and the resistor R2 is connected to the trapezoidal wave output terminal; and R1 Equal to the R2 resistance value;
- Double differential amplifier circuit including: PNP type transistor Q1 and Q2, NPN type three-stage tube Q3 and Q4, and resistors R3 and R4; common-pole input terminals of transistors Q1 and Q3 are connected with intermediate points of resistors R1 and R2; transistors Q1 and Q2 The common emitter is connected to the input terminal 3 of the resistor R3 and the rise time DC control voltage signal; the transistors Q3 and Q4 are common emitters and are connected to the input terminal 2 of the resistor R4 and the falling time DC control voltage signal; the bases of the transistors Q2 and Q4 The poles are grounded separately, and the transistors Q2 and Q4 are collectively connected and connected to the inverting input of the operational amplifier in the integral operation circuit.
- the voltage value of the positive DC control voltage signal of the trapezoid excitation pulse amplitude is + V P +
- the voltage value of the negative DC control voltage signal is - V P _, the voltage value of the rise time DC control voltage signal.
- the falling time is the voltage value of the empty voltage signal + VFT.
- the implementation principle and process of the trapezoidal excitation pulse generating device output corresponding to the trapezoidal excitation pulse provided by the first embodiment of the present invention are completely similar, so Here, the voltage value of the positive DC control voltage signal is zero as an example for detailed description.
- the negative DC control voltage can be determined according to the pulse amplitude parameter value of the trapezoidal excitation pulse of the desired output. Signal voltage value.
- V ⁇ 1 x V ⁇ x R L + 0 7 .
- V RT is a corresponding positive value of the voltage value of the rise time DC control voltage signal
- VFT is the voltage value of the DC control voltage signal during the falling time
- T r is the rise time parameter value
- T f is the fall time parameter value
- the positive voltage output dual-channel digital-to-analog conversion unit and the negative voltage output two-way analog converter in the first embodiment of the present invention are not specifically described herein.
- the first analog switch unit modulates the positive DC control voltage signal (zero voltage signal) and the negative DC control voltage signal into corresponding square wave pulses according to the input pulse width control signal and outputs the same to the first trapezoidal wave generating unit; Is the pulse width control signal P FPW and the corresponding modulated square wave pulse P S Waveform comparison chart.
- the pulse width control signal is a square wave or a rectangular wave with a pulse amplitude of 5V; the pulse amplitude of the corresponding square wave pulse P S is -V P ., and the pulse width of the square wave pulse is equal to the pulse width of the pulse width control signal PFPW.
- the pulse amplitude of the output square wave pulse P S is equal to the voltage value of the negative DC control voltage - V P _;
- the pulse width control signal P FPW When the pulse width control signal P FPW is at a logic low level, the pulse amplitude of the output square wave pulse is zero.
- the first analog switch unit inputs the square wave pulse correspondingly to the input end 1 of the reverse integrator (ie, the first trapezoidal wave generating unit), and the positive voltage output dual channel digital-to-analog conversion unit inputs the falling time DC control voltage signal correspondingly to the opposite To the input terminal 2 of the integrator, the negative voltage output dual-channel digital-to-analog conversion unit inputs the rise time DC control voltage signal correspondingly to the input terminal 3 of the inverse integrator.
- the basic working principle of the reverse integrator shown in Figure 4 is that the double differential amplification coagulation consisting of transistors Ql, Q2, Q3 and Q4 is supplied to the charge and discharge current of the feedback capacitor C1 in the integral operation circuit, so that at the output of the operational amplifier U1 The corresponding trapezoidal excitation pulse is output.
- I Q1 , I Q2 , IQ 3 and IQ 4 are the current values of the transistors Q1, Q2, Q3 and Q4, respectively; 0.7V is the PN junction voltage between the collectors of the transistor BE.
- the transistor Q4 will sink current from the feedback capacitor C1 (ie, the feedback capacitor C1 enters the discharge process), causing the voltage output from the output of the reverse integrator to start to rise.
- the pulse amplitude of the input square pulse P s is When it is kept at -V P ., the rising edge of the trapezoidal excitation pulse is formed.
- the rate of voltage rise depends on the discharge speed of the capacitor C1, which satisfies the following formula of charge and discharge of the capacitor: Equation (9)
- I is the discharge current value of the capacitor, that is, the current value I Q4 of the transistor Q4;
- C is the capacitance value, that is, the capacitance value d of the feedback capacitor C1;
- T r is the rise time;
- ⁇ / At represents the output of the operational amplifier terminal
- the rate of change of the voltage that is, the slope of the rising edge of the output voltage, that is, the ratio of the pulse amplitude value of the output trapezoidal excitation pulse to the pulse rise time T r .
- the output of the reverse integrator maintains the corresponding positive value of the voltage value of the negative DC control voltage signal
- the differential amplifying circuit enters the equilibrium state again.
- the relationship between the current values of the transistors Q1, Q2, Q3 and Q4 is exactly the same as the equations (3), (4) and (5), and no current flows through the feedback capacitor C1 of the operational amplifier. Therefore, the output of the reverse integrator maintains a corresponding positive value of the negative DC control voltage value + V P _ unchanged.
- VFT C ⁇ V P _ R 3 + 0 , ie equation ( 2) , when the required output of the trapezoidal excitation pulse rises
- the corresponding positive values of the falling time parameter value and the negative DC control voltage signal voltage value can be brought into the formula (2) to determine the voltage value of the falling time DC control voltage signal.
- Figure 6 shows the corresponding voltage waveforms of the rise time DC control voltage signal, the fall time DC control voltage signal, and the square wave pulse and the trapezoidal excitation pulse.
- the pulse amplitude of the square wave pulse P s is -V P .
- the pulse amplitude of the output trapezoidal excitation pulse is +V P .
- T is the rise time of the trapezoidal excitation pulse
- T f is the fall time of the trapezoidal excitation pulse
- 7 ⁇ is the pulse width of the trapezoidal excitation pulse.
- the description is based on the case where the voltage value of the positive DC control voltage signal is zero. In the case where the negative DC control voltage signal is zero, the above process is similar.
- the first microcontroller control unit will raise the rise time parameter value and the positive DC control voltage signal.
- the voltage value is calculated by substituting the following formula to determine the voltage value of the rise time DC control voltage signal:
- V p+ is the positive DC control voltage signal voltage value. It can be seen from the above formula (17) and formula (18) that, in the case where the negative DC control voltage signal is zero, when the pulse amplitude of the output trapezoidal excitation pulse has been determined, the voltage value of the falling time DC control voltage signal and the output trapezoid There is a specific quantitative relationship between the falling time parameter values of the excitation pulses.
- the pulse width of the output trapezoidal excitation pulse is determined by the pulse width of the input square wave pulse by the internal circuit of the trapezoidal excitation pulse generating device shown in FIG.
- the pulse amplitude of the trapezoidal excitation pulse is determined by the pulse amplitude of the input square wave pulse.
- the rise time of the trapezoidal excitation pulse is determined by the input rise time DC control voltage signal, and the falling time of the trapezoidal excitation pulse is determined by the falling time DC control voltage signal.
- the rise time DC control voltage signal voltage value and the fall time DC control power By controlling and adjusting the voltage value of the pressure signal, it is possible to control and adjust all parameters of the output trapezoidal excitation pulse.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- the second embodiment of the present invention provides another trapezoidal excitation pulse generating device.
- the method includes: a second single chip control unit 701, a positive voltage output dual channel digital-to-analog conversion unit 702, and a negative voltage output dual-channel digital-to-analog conversion unit. 703, second analog switch unit 704 and second trapezoidal wave generating unit 705; wherein:
- the second single chip control unit 701 is configured to determine a positive DC control voltage signal voltage value and a negative DC control voltage signal voltage value according to a pulse amplitude parameter value of the positive and negative trapezoidal excitation pulses required to be output; and a positive and negative trapezoid according to the required output
- the first falling time parameter value of the excitation pulse and the positive DC control voltage signal voltage value or the second falling time parameter value of the positive and negative trapezoidal excitation pulses and the negative DC control voltage signal voltage value of the desired output determine the falling time DC Controlling the voltage value of the voltage signal; determining the voltage value of the rise time DC control voltage signal according to the rising time parameter value of the positive and negative trapezoidal excitation pulse, the positive DC control voltage signal voltage value and the negative DC control voltage signal voltage value of the desired output ;
- the positive DC control voltage signal voltage value and the falling time DC control voltage signal voltage value corresponding to the digital signal is input to the positive voltage output dual channel digital-to-analog conversion unit 702;
- the digital signal corresponding to the determined negative DC control voltage signal voltage value and the rise time DC control voltage signal voltage value is input to the negative voltage output dual channel digital-to-analog conversion unit 703;
- the positive voltage output dual-channel digital-to-analog conversion unit 702 is configured to perform digital-to-analog conversion on the received digital signal, convert it into a corresponding positive DC control voltage signal and a falling-time DC control voltage signal; and input a positive DC control voltage signal to the first The second analog switch unit 704; the fall time DC control voltage signal is input to the second trapezoidal wave generating unit 705;
- a negative voltage output dual-channel digital-to-analog conversion unit 703 is configured to perform digital-to-analog conversion on the received digital signal Converting, converting into a corresponding negative DC control voltage signal and a rise time DC control voltage signal; and inputting a positive DC control voltage signal to the second analog switch unit 704; inputting the rise time DC control voltage signal to the second trapezoidal wave generating unit 705;
- the second analog switch unit 704 is configured to modulate the positive DC control voltage signal, the negative DC control voltage signal, and the zero voltage signal into corresponding positive and negative square wave pulses according to the input first pulse width control signal and the second pulse width control signal. And output to the second trapezoidal wave generating unit 705;
- the second trapezoidal wave generating unit 705 is configured to generate and output a positive and negative trapezoidal excitation pulse according to the input falling time DC control voltage signal, the rising time DC control voltage signal, and the positive and negative square wave pulses.
- the trapezoidal excitation pulse generating device may further include: a linear power amplifying unit 706; configured to linearly expand the pulse amplitude of the output positive and negative trapezoidal excitation pulses to M times of the original pulse amplitude; M is an integer greater than 1.
- the second trapezoidal wave generating unit is identical to the internal circuit of the first trapezoidal generating unit in the first embodiment, and the trapezoidal excitation pulse generating device provided in the second embodiment of the present invention is described below with reference to FIG. The working principle is explained.
- the amplitude value of the impulse amplitude, the corresponding positive value of the negative pulse amplitude value is equal to the voltage value of the positive DC control voltage signal; correspondingly, the corresponding negative value of the positive pulse amplitude value is equal to the voltage value of the negative DC control voltage signal. Therefore, the second positive DC control voltage signal voltage value and the negative DC control voltage signal voltage value are determined,
- the second single chip control unit further has a first falling time parameter value of the trapezoidal excitation pulse and a positive DC control voltage signal voltage value or a second falling time parameter value and a negative DC control according to the required output of the trapezoidal excitation pulse.
- the voltage signal voltage value determines the voltage value of the falling time DC control voltage signal; the method of determining is as follows:
- the positive DC control voltage signal voltage value and the negative DC control voltage signal voltage value determine the voltage value of the rise time DC control voltage signal.
- the process is as follows: The rise time parameter value of the trapezoidal excitation pulse of the desired output, the positive DC control voltage signal voltage value and the negative DC control voltage signal voltage value are substituted into the following formula to determine the voltage value of the rise time DC control voltage signal:
- T ' CV P ⁇ V P - )-R, . Equation (21)
- ⁇ ⁇ ' is the first fall time of the positive and negative trapezoidal excitation pulses
- ⁇ ' is positive and negative The second falling time of the trapezoidal excitation pulse
- V RT ' is the corresponding positive value of the voltage value of the rising time DC control voltage
- VFT' is the voltage value of the falling time DC control voltage
- V P . ' is the negative DC control voltage signal voltage value Corresponding positive value
- V p+ ' is the positive DC control voltage signal voltage value
- (:! is the capacitance value of the feedback capacitor C1 in the second trapezoidal wave generating unit
- R 3 and the resistance R3 in the second trapezoidal wave generating unit respectively The resistance value of R4.
- the second analog switch modulates the pulse amplitude positive DC control voltage signal, the negative DC control voltage signal, and the zero voltage signal into corresponding positive and negative square wave pulses according to the first pulse width control signal and the second pulse width control signal, and the process includes :
- the amplitude value of the output positive and negative square wave pulses is The voltage value of the positive DC control voltage signal
- the amplitude value of the output positive and negative square wave pulses is a voltage value of the negative DC control voltage signal
- the output positive and negative square wave pulse amplitude is zero.
- P FPW1 is a first pulse width control signal
- PFP W2 is a second pulse width control signal
- P S 'Be a positive and negative square wave pulse.
- the first pulse width control signal and the second pulse width control signal are square wave or rectangular wave pulses, and the falling edge of the first pulse width control signal coincides with the rising edge of the second pulse width control signal.
- the second trapezoidal wave generating unit has the same internal circuit of the first trapezoidal wave generating unit in the first embodiment of the internal circuit, and therefore the second trapezoidal wave generating unit generates a positive and negative trapezoidal exciting pulse according to the input positive and negative square wave pulses.
- a trapezoidal wave generating unit is similar, as described below:
- the reverse integrator output voltage value is reduced from zero at a constant rate to a corresponding negative value of the positive dc control voltage signal voltage value, and generated. a first falling edge of the positive and negative trapezoidal excitation pulses;
- the output of the reverse integrator maintains the corresponding negative value of the positive DC control voltage signal voltage value
- the voltage value output by the reverse integrator is corresponding to the voltage value of the positive DC control voltage signal at a constant rate.
- the negative value is increased to a corresponding positive value of the voltage value of the negative DC control voltage signal, and a rising edge of the positive and negative trapezoidal excitation pulses is generated;
- the output of the reverse integrator maintains the corresponding positive value of the negative DC control voltage signal voltage value
- Fig. 9 is a comparison diagram of voltage waveforms of positive and negative trapezoidal excitation pulses generated by the input positive and negative square wave pulses and the second trapezoidal wave generating unit.
- the positive and negative trapezoidal excitation pulses ⁇ ⁇ ' include a first falling edge 901, the corresponding first falling time is TV; the rising edge 902, the corresponding rising time is T; and the second falling edge 903, the corresponding second falling time is ⁇ ⁇ '.
- T w is the first width value of the positive and negative trapezoidal excitation pulses and is the second width value of the positive and negative trapezoidal excitation pulses.
- the rising time of the positive and negative trapezoidal excitation pulses formed by the second trapezoidal wave generating unit and the first falling time and the second falling time are respectively related to the voltage value of the rising time DC control voltage signal and the falling time of the DC control voltage signal. Values have the following number relationships:
- the trapezoidal excitation pulse generating device provided in the first embodiment and the second embodiment of the present invention is only a preferred implementation of the embodiment of the present invention. In practical applications, various embodiments may be further implemented, for example, a trapezoidal excitation pulse may be used.
- the functional units in the generating device are further integrated or split, and the internal structure of the trapezoidal excitation pulse generating device is deformed according to the embodiment of the present invention without changing the implementation principle of the trapezoidal excitation pulse generating device provided by the embodiment of the present invention. Not limited.
- the internal circuits of the first trapezoidal wave generating unit and the second trapezoidal wave generating unit in the trapezoidal excitation pulse generating device provided by the first embodiment and the second embodiment of the present invention are only a preferred implementation method of the trapezoidal excitation pulse generating method. In an actual application, a plurality of other circuits may be implemented. The specific circuit of the present invention is not limited.
- Embodiment 3 is a diagrammatic representation of Embodiment 3
- a third embodiment of the present invention provides a trapezoidal excitation pulse generating method. As shown in FIG. 10, the method includes the following steps: controlling a voltage signal voltage value, and setting a positive DC control voltage signal voltage value to zero; or, according to a desired output
- the pulse amplitude parameter value of the trapezoidal excitation pulse determines the voltage value of the positive DC control voltage signal, and sets the negative DC control voltage signal voltage value to zero;
- the rise time DC control voltage signal voltage value is determined according to the rising time parameter value of the trapezoidal excitation pulse and the voltage value of the negative DC control voltage signal;
- the falling time parameter value of the trapezoidal excitation pulse and the negative DC control voltage signal voltage value determine the falling time DC control voltage signal voltage value;
- the rise time parameter value of the trapezoidal excitation pulse and the voltage value of the positive DC control voltage signal are determined according to the voltage value of the rise time DC control voltage pressure signal to determine the fall time.
- Step 102 Generate a corresponding DC control voltage signal according to the determined negative DC control voltage signal voltage value, positive DC control voltage signal voltage value, rise time DC control voltage signal voltage value, and fall time DC control voltage signal voltage value;
- Step 103 modulate the positive DC control voltage signal and the negative DC control voltage signal into corresponding square wave pulses by using a pulse width control signal in the form of a square wave or a rectangular wave pulse;
- the process of modulation includes: when the pulse width control signal is at a logic high level, the output square wave pulse amplitude is a voltage value of the positive DC control voltage signal or a voltage value of the negative DC control voltage signal; When the pulse width control signal is at a logic low level, the output square wave pulse amplitude is zero.
- Step 104 The rising time DC control voltage signal, the falling time DC control voltage signal, and the square wave pulse are input into a reverse integrator of the feedback loop formed by the double differential amplifying circuit to generate a trapezoidal excitation pulse and output.
- the specific implementation process is as follows:
- the output voltage value of the reverse integrator increases from zero to a corresponding positive value of the voltage value of the negative dc control voltage signal at a constant rate to generate a trapezoidal excitation.
- the output of the reverse integrator maintains the corresponding positive value of the voltage value of the negative DC control voltage signal
- the output of the reverse integrator maintains the corresponding negative value of the positive DC control voltage signal voltage value
- the reverse integrator output voltage value increases from the corresponding negative value of the positive DC control voltage signal voltage value to zero at a constant rate to generate a trapezoidal excitation. The rising edge of the pulse.
- the pulse amplitude of the output trapezoidal excitation pulse can be linearly expanded to M times the original pulse amplitude; the pulse amplitude of the trapezoidal excitation pulse is increased to drive the ink jet to eject the ink droplet.
- the pulse amplitude FPA of the enlarged trapezoidal excitation pulse is obtained by the following formula:
- M is a multiple of linear expansion of the pulse amplitude, and M is an integer greater than 1.
- the rise time of the trapezoidal excitation pulse after linear expansion is calculated as follows:
- Embodiment 4 is a diagrammatic representation of Embodiment 4:
- a fourth embodiment of the present invention provides a method for generating a positive and negative trapezoidal excitation pulse. As shown in FIG. 11, the method includes the following steps:
- Step 111 Determine a voltage value of the positive current control voltage signal voltage and the negative DC control voltage signal according to the positive and negative pulse amplitudes of the positive and negative trapezoidal excitation pulses of the desired output;
- Step 112 Generate a corresponding DC control according to the determined negative DC control voltage signal voltage value, the voltage value of the positive DC control voltage signal, the rise time DC control voltage signal voltage value, and the fall time DC control voltage signal voltage value.
- Step 113 using a first pulse width control signal and a second pulse width control signal in the form of square wave or rectangular wave pulse, and adopting a positive direct current control voltage signal, a negative direct current control voltage signal, and a zero voltage signal Modulating into a positive and negative square wave pulse; a falling edge of the first pulse width control signal coincides with a rising edge of the second pulse width control signal;
- the process of modulation includes: when the first pulse width control signal is at a logic high level, the amplitude value of the output positive and negative square wave pulses is a voltage value of the positive DC control voltage signal;
- the amplitude value of the output positive and negative square wave pulses is a voltage value of the negative DC control voltage signal
- the output positive and negative square wave pulse amplitude is zero.
- Step 114 Input a rising time DC control voltage signal, a falling time DC control voltage signal, and a positive and negative square wave pulse to a reverse integrator composed of a double differential amplifying circuit to form a feedback loop, and generate a positive and negative trapezoidal excitation pulse and output.
- the specific implementation process is as follows:
- the reverse integrator output voltage value is reduced from zero at a constant rate to a corresponding negative value of the positive dc control voltage signal voltage value, and generated. a first falling edge of the positive and negative trapezoidal excitation pulses;
- the output of the reverse integrator maintains the corresponding negative value of the positive DC control voltage signal voltage value
- the voltage value output by the reverse integrator is correspondingly negative from the voltage value of the positive DC control voltage signal at a constant rate.
- the value is increased to a corresponding positive value of the voltage value of the negative DC control voltage signal to generate a rising edge of the positive and negative trapezoidal excitation pulses;
- the output of the reverse integrator maintains the corresponding positive value of the negative DC control voltage signal voltage value
- the reverse integrator output voltage value is reduced from the corresponding positive value of the negative DC control voltage signal voltage value to zero at a constant rate to generate The second falling edge of the positive and negative trapezoidal excitation pulses.
- the trapezoidal excitation pulse generating method determines the positive DC control voltage signal voltage value, the negative DC control voltage signal voltage value, and the rise time DC ⁇ ⁇ vacancy according to the trapezoidal excitation pulse parameter value of the required output.
- Voltage signal and falling time DC control voltage signal voltage value and generate corresponding DC control voltage signal; modulate positive DC control voltage signal and negative DC control voltage signal into square wave pulse; and rise time DC control voltage signal and fall time
- the DC control voltage signal and the square wave pulse input inverse integrator generate a trapezoidal excitation pulse.
- the voltage value of the rising DC control voltage signal is The precise control and adjustment of the voltage value of the DC control voltage signal during the falling time can accurately control and adjust the rise time and fall time corresponding to the output trapezoidal excitation pulse, so that the output trapezoidal excitation pulse is more stable and accurate, avoiding the present
- the output trapezoidal excitation pulse waveform fluctuates due to the change of the load in the excitation pulse generation system, and according to the input of the different square wave pulse signals, different types of trapezoidal excitation pulses can be generated and output.
- the trapezoidal excitation pulse generating device provided by the embodiment of the invention can realize the digital adjustment of the rising/falling time DC control voltage signal, has a simple structure, high adjustment precision, and can realize various types of trapezoidal excitation pulses. Output to meet the requirements of different types of inkjet printheads.
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Description
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US12/935,508 US8278976B2 (en) | 2008-03-31 | 2009-03-31 | Methods and devices for generating trapezoidal fire pulses |
JP2011502217A JP2011517898A (ja) | 2008-03-31 | 2009-03-31 | 台形ファイヤーパルスの発生方法及び装置 |
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CN2008101031514A CN101257291B (zh) | 2008-03-31 | 2008-03-31 | 一种梯形激励脉冲发生方法及装置 |
CN200810103151.4 | 2008-03-31 |
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TWI821563B (zh) * | 2019-06-11 | 2023-11-11 | 日商松下知識產權經營股份有限公司 | 半導體繼電器 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101257291B (zh) * | 2008-03-31 | 2010-12-08 | 北大方正集团有限公司 | 一种梯形激励脉冲发生方法及装置 |
JP2011120216A (ja) * | 2009-11-05 | 2011-06-16 | Rohm Co Ltd | アンテナ駆動装置 |
CN101807864B (zh) * | 2010-03-25 | 2012-05-30 | 吉林大学 | 磁性源电磁法发射电流分段控制电路 |
JP5334271B2 (ja) * | 2011-06-03 | 2013-11-06 | 富士フイルム株式会社 | 液体吐出ヘッドの駆動装置、液体吐出装置及びインクジェット記録装置 |
CN102427347A (zh) * | 2011-09-30 | 2012-04-25 | 中国兵器工业集团第二一四研究所苏州研发中心 | 一种削顶三角波发生电路 |
CN103970380B (zh) * | 2013-02-01 | 2017-05-10 | 晨星半导体股份有限公司 | 电容式触控系统及其驱动装置 |
KR101672583B1 (ko) * | 2014-02-18 | 2016-11-03 | 주식회사 포스코아이씨티 | 독립 제어 타입의 마이크로 펄스 시스템, 마이크로 펄스 시스템의 제어방법, 및 마이크로 펄스 시스템을 포함하는 전기 집진장치 |
US9751302B1 (en) | 2016-03-01 | 2017-09-05 | Ricoh Company, Ltd. | Mitigating effects of crosstalk in an inkjet head |
US9796177B2 (en) | 2016-03-01 | 2017-10-24 | Ricoh Company, Ltd. | Temperature uniformity across an inkjet head using piezoelectric actuation |
CN106253879B (zh) * | 2016-08-09 | 2018-09-04 | 电子科技大学 | 一种峰值电压可变的梯形脉冲产生电路 |
US10493756B2 (en) | 2018-03-06 | 2019-12-03 | Ricoh Company, Ltd. | Temperature sensing in a printhead using piezoelectric actuators |
WO2020041277A1 (en) * | 2018-08-23 | 2020-02-27 | Mayo Foundation For Medical Education And Research | Measuring neurochemical levels with multiple cyclic square wave voltammetry |
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JPH10146971A (ja) * | 1996-11-20 | 1998-06-02 | Seiko Epson Corp | プリンタヘッドの駆動回路 |
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GB0722740D0 (en) * | 2007-11-20 | 2008-01-02 | Melexis Nv | Improvements in or relating to bldc motors |
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JPH10146971A (ja) * | 1996-11-20 | 1998-06-02 | Seiko Epson Corp | プリンタヘッドの駆動回路 |
CN201017236Y (zh) * | 2007-03-13 | 2008-02-06 | 哈尔滨飞机工业集团有限责任公司 | 双通道嵌入式数字伺服控制板 |
CN101257291A (zh) * | 2008-03-31 | 2008-09-03 | 北大方正集团有限公司 | 一种梯形激励脉冲发生方法及装置 |
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TWI821563B (zh) * | 2019-06-11 | 2023-11-11 | 日商松下知識產權經營股份有限公司 | 半導體繼電器 |
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US8278976B2 (en) | 2012-10-02 |
CN101257291A (zh) | 2008-09-03 |
JP2011517898A (ja) | 2011-06-16 |
US20110084739A1 (en) | 2011-04-14 |
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