CN203528110U - Print head drive circuit of needle printer - Google Patents
Print head drive circuit of needle printer Download PDFInfo
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- CN203528110U CN203528110U CN201320545980.4U CN201320545980U CN203528110U CN 203528110 U CN203528110 U CN 203528110U CN 201320545980 U CN201320545980 U CN 201320545980U CN 203528110 U CN203528110 U CN 203528110U
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- drive circuit
- triode
- discharge
- diode
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Abstract
The utility model discloses a print head drive circuit of a needle printer. The print head drive circuit comprises a signal control module, a print needle drive circuit, a backward voltage clamping circuit, and a print head coil. A needle outgoing control signal output end of the signal control module is connected with an input end of the print needle drive circuit. One end of the print head coil is connected with an output end of the print needle drive circuit while the other end of the print head coil is connected with a print needle drive power supply. The backward voltage clamping circuit comprises a discharge triode and a switch module controlling the discharge triode, wherein the base electrode of the discharge triode is connected with the switch module; the emitter electrode of the discharge triode is connected with the print needle drive power supply; the collector electrode of the discharge triode is connected with one output end of the print needle drive circuit; and the switch module is connected with a discharge control signal output end of the signal control module. The print head drive circuit can enable the discharge compensation time of the print head coil to be reduced and allow the accelerated withdrawal of print needles, thereby increasing the needle outgoing and withdrawing frequency of a print head and realizing the high-speed printing.
Description
Technical field
The utility model relates to a kind of circuit of impact printer, particularly relates to a kind of print-head drive circuit of impact printer.
Background technology
The printhead of impact printer is furnished with many print needles, every print needle has the solenoid of oneself, when these solenoids obtain electric after, just can produce magnetic force, attract corresponding print needle clappers, drive print needle action, whether print needle obtains the whether electric print needle of controlling and moves by controlling these solenoids.
Referring to Fig. 1, Fig. 2, print-head drive circuit is used for driving print needle, and print-head drive circuit is mainly comprised of print needle drive circuit and backward voltage clamp circuit at present, and its drive principle is:
1, when print needle receives print data and goes out stylus printer and print, control chip HDP opens print-head drive circuit U1, and power supply is to printhead coil L charging, and printhead coil L electric current increases, and print needle is in going out needle-like state.
2,, when printhead cluster loop current reaches pin upper current limit, control chip HDP disconnects print-head drive circuit U1, printhead coil L electric discharge, and recoil electromotive force raises, as A point voltage (V
a) higher than supply voltage (V
p) with the reverse-conducting voltage (V of diode ZD1
zD1) voltage sum time, i.e. V
a>V
p+ V
zD1, diode ZD1 conducting, printhead coil electric energy discharges by diode ZD1, and the continuous discharge of printhead cluster loop current causes its electromotive force constantly to decline, until A point voltage (V
a) drop to gradually supply voltage (V
p) magnitude of voltage, print needle reverts to the stable state of narrowing.
From the oscillogram of Fig. 2, can find out, the trend that printhead cluster loop current reduces is comparatively mild, causes print needle narrowing speed slower, thereby affects the frequency that print needle goes out pin and narrowing, and print speed is slower.
Utility model content
For problems of the prior art, the purpose of this utility model is to provide a kind of print-head drive circuit that print needle goes out the impact printer of pin and narrowing frequency that improves.
The utility model is that the technical scheme that technical solution problem adopts is:
The print-head drive circuit of impact printer, comprise signal controlling module, print needle drive circuit, backward voltage clamp circuit and printhead coil, the pin control signal output that goes out of signal controlling module is connected with the input of print needle drive circuit, one end of printhead coil is connected with the output of print needle drive circuit, the other end is connected with print needle driving power, backward voltage clamp circuit comprises the switch module of discharge diode and controlled discharge triode, the base stage of described discharge diode is connected with switch module, emitter stage is connected with print needle driving power, colelctor electrode is connected with an output of print needle drive circuit, described switch module is connected with the discharge control signal output of signal controlling module.
Further, described discharge diode is NPN type triode.
Further, described switch module comprises the first triode, the second triode, and the base stage of described the first triode is connected with the discharge control signal output of signal controlling module, and colelctor electrode is connected with the base stage of the second triode, grounded emitter; The colelctor electrode of described the second triode is connected with the base stage of discharge diode, and emitter stage is connected with fast recovery rectifier diode, and is connected with printhead coil by fast recovery rectifier diode.
Further, described the first triode is NPN type triode, and the second triode is positive-negative-positive triode, and the colelctor electrode of described the first triode is connected with the first resistance, and by the first resistance, is connected to the base stage of the second triode; Between the base stage of described the second triode and emitter stage, be connected with the second resistance.
Further, described switch module also comprises Zener diode, and one end of described Zener diode is connected with the first diode, and the other end is connected with the 3rd resistance, and is connected to print needle driving power by the 3rd resistance.
Further, described print needle drive circuit comprises driving tube, the input of described driving tube with go out pin control signal output and be connected, the output of described driving tube is connected with printhead coil.
The beneficial effects of the utility model are: the print-head drive circuit of the impact printer that the utility model adopts, can make printhead coil discharging compensation time shorten, and print needle accelerates narrowing, thereby improved printhead, goes out pin and narrowing frequency, realizes flying print.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and enforcement, the utility model is described further.
Fig. 1 is the print-head drive circuit schematic diagram of prior art;
Fig. 2 is the control situation of print needle coil current of the print-head drive circuit of prior art;
Fig. 3 is print-head drive circuit schematic diagram of the present utility model;
Fig. 4 is the control situation of the print needle coil current of print-head drive circuit of the present utility model;
Fig. 5 is the time dependent oscillogram of A point voltage in print-head drive circuit of the present utility model;
Fig. 6 is the output voltage waveform that pin control signal output of signal controlling module of the present utility model;
Fig. 7 is the output voltage waveform of the discharge control signal output of signal controlling module of the present utility model.
The specific embodiment
With reference to Fig. 3 to Fig. 7, the print-head drive circuit of impact printer, comprise signal controlling module FPGA, print needle drive circuit U1, backward voltage clamp circuit U2 and printhead coil L, the pin control signal output HDP that goes out of signal controlling module FPGA is connected with the input of print needle drive circuit U1, one end of printhead coil L is connected with the output of print needle drive circuit U1, the other end is connected with print needle driving power VP, backward voltage clamp circuit U2 comprises the switch module of discharge diode TR3 and controlled discharge triode TR3, described discharge diode TR3 is NPN type triode, the base stage of described discharge diode TR3 is connected with switch module, emitter stage is connected with print needle driving power VP, colelctor electrode is connected with an output of print needle drive circuit U1, described switch module is connected with the discharge control signal output SGC of signal controlling module FPGA.
Described switch module comprises the first triode TR1, the second triode TR2, and the base stage of described the first triode TR1 is connected with the discharge control signal output SGC of signal controlling module FPGA, and colelctor electrode is connected with the base stage of the second triode TR2, grounded emitter; The colelctor electrode of described the second triode TR2 is connected with the base stage of discharge diode TR3, and emitter stage is connected with fast recovery rectifier diode D1, and is connected with printhead coil L by fast recovery rectifier diode D1.
Described the first triode TR1 is NPN type triode, and the second triode TR2 is positive-negative-positive triode, and the colelctor electrode of described the first triode TR1 is connected with the first resistance R 1, and by the first resistance R 1, is connected to the base stage of the second triode TR2; Between the base stage of described the second triode TR2 and emitter stage, be connected with the second resistance R 2.
In addition, described switch module also comprises Zener diode D2, and one end of described Zener diode D2 is connected with the first diode D1, and the other end is connected with the 3rd resistance R 3, and is connected to print needle driving power VP by the 3rd resistance R 3.
In the present embodiment, described print needle drive circuit U1 comprises driving tube TR4, the input of described driving tube TR4 with go out pin control signal output HDP and be connected, the output of described driving tube TR4 is connected with printhead coil L.
Operation principle of the present utility model is: when printhead is when narrowing stable state, signal controlling module FPGA goes out pin control signal output HDP output low level signal, driving tube TR4 and fast recovery rectifier diode D1 by, printhead coil L does not have electric current to flow through.To t1 constantly, go out pin control signal output HDP output high level signal, driving tube TR4 conducting, the voltage V that A is ordered
abe pulled low to the saturation conduction voltage of driving tube TR4, the electric current of the printhead coil L that flows through continues to rise, and printhead is in going out needle-like state.
To t2 constantly, go out pin control signal output HDP output low level signal, driving tube TR4 cut-off, and control of discharge module by signal output SGC exports high level signal simultaneously, and now, printhead coil L electric discharge, inverse electromotive force raises and makes A point voltage V
amoment surpasses the magnitude of voltage of print needle driving power VP, the first triode TR1, the second triode TR2, discharge diode TR3, fast recovery rectifier diode D1 be fast conducting immediately, the discharge current of printhead coil L is back to print needle driving power VP by fast recovery rectifier diode D1 and discharge diode TR3, A point voltage V
aconducting voltage sum by clamp to voltage and the discharge diode TR3 of print needle driving power VP, printhead enters discharge condition.
To t3 constantly, control of discharge module by signal output SGC output low level signal, the first triode TR1, the second triode TR2, discharge diode TR3 cut-off.Zener diode D2 reverse operation, printhead coil L continues electric discharge, and electric current mainly, by base stage and the emitter stage of fast recovery rectifier diode D1, Zener diode D2, discharge diode TR3, is finally back to print needle driving power VP.Now, the voltage V that A is ordered
ait by clamp, is the conducting voltage sum of reverse burning voltage and the discharge diode TR3 of Zener diode D2.
To t4 constantly, because printhead coil L continuous discharge causes voltage V
ainverse electromotive force constantly decline, until the voltage V that A is ordered
aduring lower than the reverse burning voltage of Zener diode D2 and the conducting voltage sum of discharge diode TR3, fast recovery rectifier diode D1, Zener diode D2 cut-off, the voltage V that A is ordered
acontinue slow decreasing to the magnitude of voltage of print needle driving power VP, last print head recovery is narrowing stable state.
From the oscillogram shown in Fig. 4, can find out, when entering t3 constantly, the electric current by printhead coil L declines rapidly, the magnetic force of printhead coil L weakens, the acceleration of print needle narrowing further increases, thereby improved printhead, goes out pin and narrowing frequency, realizes flying print.
The above, be preferred embodiment of the present utility model, and the utility model is not limited to above-mentioned embodiment, as long as it reaches technique effect of the present utility model with identical means, all should belong to protection domain of the present utility model.
Claims (6)
1. the print-head drive circuit of impact printer, comprise signal controlling module (FPGA), print needle drive circuit (U1), backward voltage clamp circuit (U2) and printhead coil (L), the pin control signal output (HDP) that goes out of signal controlling module (FPGA) is connected with the input of print needle drive circuit (U1), one end of printhead coil (L) is connected with the output of print needle drive circuit (U1), the other end is connected with print needle driving power (VP), it is characterized in that: backward voltage clamp circuit (U2) comprises the switch module of discharge diode (TR3) and controlled discharge triode (TR3), the base stage of described discharge diode (TR3) is connected with switch module, emitter stage is connected with print needle driving power (VP), colelctor electrode is connected with an output of print needle drive circuit (U1), described switch module is connected with the discharge control signal output (SGC) of signal controlling module (FPGA).
2. the print-head drive circuit of impact printer according to claim 1, is characterized in that: described discharge diode (TR3) is NPN type triode.
3. the print-head drive circuit of impact printer according to claim 1, it is characterized in that: described switch module comprises the first triode (TR1), the second triode (TR2), the base stage of described the first triode (TR1) is connected with the discharge control signal output (SGC) of signal controlling module (FPGA), colelctor electrode is connected with the base stage of the second triode (TR2), grounded emitter; The colelctor electrode of described the second triode (TR2) is connected with the base stage of discharge diode (TR3), and emitter stage is connected with fast recovery rectifier diode (D1), and is connected with printhead coil (L) by fast recovery rectifier diode (D1).
4. the print-head drive circuit of impact printer according to claim 3, it is characterized in that: described the first triode (TR1) is NPN type triode, the second triode (TR2) is positive-negative-positive triode, the colelctor electrode of described the first triode (TR1) is connected with the first resistance (R1), and by the first resistance (R1), is connected to the base stage of the second triode (TR2); Between the base stage of described the second triode (TR2) and emitter stage, be connected with the second resistance (R2).
5. the print-head drive circuit of impact printer according to claim 3, it is characterized in that: described switch module also comprises Zener diode (D2), one end of described Zener diode (D2) is connected with the first diode (D1), the other end is connected with the 3rd resistance (R3), and is connected to print needle driving power (VP) by the 3rd resistance (R3).
6. the print-head drive circuit of impact printer according to claim 1, it is characterized in that: described print needle drive circuit (U1) comprises driving tube (TR4), the input of described driving tube (TR4) with go out pin control signal output (HDP) and be connected, the output of described driving tube (TR4) is connected with printhead coil (L).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320545980.4U CN203528110U (en) | 2013-09-03 | 2013-09-03 | Print head drive circuit of needle printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320545980.4U CN203528110U (en) | 2013-09-03 | 2013-09-03 | Print head drive circuit of needle printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203528110U true CN203528110U (en) | 2014-04-09 |
Family
ID=50414362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320545980.4U Expired - Lifetime CN203528110U (en) | 2013-09-03 | 2013-09-03 | Print head drive circuit of needle printer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203528110U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106394023A (en) * | 2016-08-31 | 2017-02-15 | 福建联迪商用设备有限公司 | Control circuit of needle printer |
-
2013
- 2013-09-03 CN CN201320545980.4U patent/CN203528110U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106394023A (en) * | 2016-08-31 | 2017-02-15 | 福建联迪商用设备有限公司 | Control circuit of needle printer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |
|
| CX01 | Expiry of patent term |