CN103213412A - Backward voltage regeneration circuit and dot matrix printer - Google Patents
Backward voltage regeneration circuit and dot matrix printer Download PDFInfo
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- CN103213412A CN103213412A CN2013100271244A CN201310027124A CN103213412A CN 103213412 A CN103213412 A CN 103213412A CN 2013100271244 A CN2013100271244 A CN 2013100271244A CN 201310027124 A CN201310027124 A CN 201310027124A CN 103213412 A CN103213412 A CN 103213412A
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Abstract
The invention aims to increase the ratio of current regenerated in a power supply, the current being generated by backward voltage generated in a coil (200) used for driving a head needle, and the invention also aims to reduce the heating of elements. A voltage detection circuit (11) changes the level of a signal outputted to a control signal generation circuit (12) according to the magnitude of the aforementioned backward voltage. The control signal generation circuit (12) outputs a conducting signal to a switch circuit (13) in the case that the aforementioned backward voltage is higher than specified voltage and outputs a stopping signal to the switch circuit (13) in the case that the aforementioned backward voltage is lower than specified voltage. On the condition that the conducting signal is inputted into the switch circuit (13), the coil (200) and a smooth circuit (14) are conducted; and on the condition that the stopping signal is inputted into the switch circuit (13), the conduction between the coil (200) and the smooth circuit (14) is cut off. An output terminal of the smooth circuit (14) is connected to the positive potential side of the power supply of a head needle driving circuit (20) so as to enable the aforementioned current to be smoothed and to flow back to the power supply.
Description
Technical field
The present invention relates to backward voltage regenerative circuit and dot-matrix printer.
Background technology
Following technology is disclosed in following patent documentation 1: in the scalp acupuncture drive circuit of dot-matrix printer, make the backward voltage that produces in the coil that drives scalp acupuncture drop to scalp acupuncture and drive and turn back to this power supply with power source voltage and utilize once more.
In above-mentioned patent documentation 1, drive in the regenerative circuit of using between the power supply at the coil of being located at the driving scalp acupuncture and scalp acupuncture, (Field Effect Transistor: two Zener diodes (Zener diode) that are being connected in series between drain terminal field-effect transistor) and the gate terminal are being connected resistance between gate terminal and source terminal at the n channel fet.
And, driving the backward voltage that produces in the coil of usefulness at scalp acupuncture has reached under the situation of value of Zener voltage gained that supply voltage adds two Zener diodes, this n channel fet conducting is moved with the mode of the power supply that drives usefulness so that the induced electromotive force that produces in the coil of scalp acupuncture driving usefulness turns back to scalp acupuncture.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2005-7678 communique
Summary of the invention
The problem that invention will solve
But in the regenerative circuit of above-mentioned patent documentation 1, the n channel fet stably keeps having the state of interlaminated resistance value, and the n channel fet that the electric power of the backward voltage that produces in the coil based on scalp acupuncture driving usefulness is used as resistor work consumes as heat.That is, a part that drives the electric power of the backward voltage that produces in the coil of usefulness based on scalp acupuncture turns back to the power supply of scalp acupuncture with driving usefulness, and remaining electric power is consumed as heat in the n channel fet.
Therefore, when scalp acupuncture drove, the heating of n channel fet might cause thermal runaway, owing to generate heat miscellaneous part be brought influence owing to heating.Therefore, need the high parts of selected heat resistance or heat dissipation equipment is set, cost uprises or installs maximization sometimes.
Therefore, the objective of the invention is to: can improve driving the backward voltage that produces in the coil of usefulness among the electric power that forms, be regenerated as the shared ratio of electric power of power supply, and the heating of element is reduced based on scalp acupuncture.
The technical scheme that is used to deal with problems
A mode that is used to address the above problem is a kind of backward voltage regenerative circuit that is used in dot-matrix printer, possesses: voltage detecting circuit; The control signal generative circuit; On-off circuit; And smoothing circuit, the size of the backward voltage that produces in the coil of aforesaid voltage testing circuit according to the scalp acupuncture drive circuit changes the level to the signal of aforementioned control signal generative circuit output, aforementioned control signal generative circuit be transfused to from aforementioned voltage detecting circuit the expression aforementioned backward voltage reach under the situation of the output signal more than the assigned voltage, to aforementioned on-off circuit output Continuity signal, aforementioned control signal generative circuit is being transfused to from aforementioned voltage detecting circuit under the situation of the aforementioned backward voltage of expression less than the output signal of aforementioned assigned voltage, to aforementioned on-off circuit output pick-off signal, the aforementioned switches circuit is being transfused under the situation of aforementioned Continuity signal, make aforementioned coil and aforementioned smoothing circuit conducting, the aforementioned switches circuit is being transfused under the situation of aforementioned pick-off signal, cut off the conducting of aforementioned coil and aforementioned smoothing circuit, the lead-out terminal of aforementioned smoothing circuit is connected to the positive potential side of the power supply of aforementioned scalp acupuncture drive circuit, makes the electric current smoothing that produces owing to the aforementioned backward voltage that is provided via the aforementioned switches circuit from aforementioned coil and is back to power supply.
On-off circuit carries out the electric current supply to smoothing circuit intermittently, can suppress the peak value of the backward voltage that produced thus, and the power consumption that can suppress in on-off circuit etc. makes it lower.Therefore, can use more the switch element of small amount definite value (for example FET etc.), and also can suppress heat radiation.Therefore, do not need (perhaps can reduce) heat dissipation equipment, help the minimization of substrate area and the miniaturization of device.And, also can realize power supply miniaturization based on the raising of power-efficient.
At this, the aforesaid voltage testing circuit connects in the mode that can detect the size of the backward voltage that produces in the coil of aforementioned scalp acupuncture drive circuit, aforementioned control signal generative circuit connects in the mode of the output signal that is transfused to the aforesaid voltage testing circuit, the aforementioned switches circuit is located between the coil and aforementioned smoothing circuit of aforementioned scalp acupuncture drive circuit, be transfused under the situation of aforementioned Continuity signal from aforementioned control signal generative circuit, make conducting between this coil and this smoothing circuit, make this smoothing circuit of current direction that produces owing to the backward voltage that produces in this coil, the backward voltage that produces in this coil is descended, at this backward voltage because the decline of this backward voltage and less than aforementioned assigned voltage, and be transfused under the situation of aforementioned pick-off signal from aforementioned control signal generative circuit, cut off the conducting between this coil and this smoothing circuit, cut off because the electric current that the backward voltage that produces in this coil produces mobile to this smoothing circuit makes the decline of the backward voltage that produces in this coil stop thus.
Thus, on-off circuit can be reliably conducting and ending repeatedly, can make the energy that under the low state of heating, residues in the coil be back to power supply.
In addition, the aforesaid voltage testing circuit changes the level of the signal of output by making aforementioned backward voltage and aforementioned assigned voltage comparison.Thus, can easily constitute by general parts such as comparators.
At this, the aforesaid voltage testing circuit is made of differential amplifier, and aforementioned control signal generative circuit is contained in the aforementioned differential amplifier.Thus, can be easily constitute by the differential amplifier of easy acquisition.
At this, aforementioned control signal generative circuit is after the aforementioned backward voltage of expression reaches signal more than the aforementioned assigned voltage pass through the stipulated time from aforementioned voltage detecting circuit is output after, import aforementioned Continuity signal to aforementioned on-off circuit, after being output, aforementioned voltage detecting circuit after the process stipulated time, imports aforementioned pick-off signal less than the signal of aforementioned assigned voltage at the aforementioned backward voltage of expression to aforementioned on-off circuit.Thus, can make on-off circuit conducting and ending reliably.
In addition, the aforementioned switches circuit is a transistor, and aforementioned Continuity signal is the signal that aforementioned transistor is moved in the zone of saturation, and aforementioned pick-off signal is to make aforementioned transistor cut off the signal that move in the zone.Thus, can use the transistor that obtains easily to constitute the backward voltage regenerative circuit.
In addition, aforesaid voltage testing circuit and aforementioned control signal generative circuit move as reference potential with the positive potential side of the power supply of aforementioned scalp acupuncture drive circuit.Thus, can suppress power consumption in voltage detecting circuit and the control signal generative circuit.In addition, can use withstand voltage low element to constitute the backward voltage regenerative circuit, can suppress cost and make it lower.
In addition, other modes that are used to address the above problem can be the dot-matrix printer with arbitrary backward voltage regenerative circuit of above-mentioned record.Thus, can make the dot-matrix printer miniaturization.
Description of drawings
Fig. 1 is the circuit diagram of an example of formation that the scalp acupuncture drive unit of the dot-matrix printer that is used in present embodiment is shown.
Fig. 2 is the concept map that is used to illustrate an example of printing action.
Fig. 3 is used for the key diagram that the generation position to each voltage or electric current describes.
Fig. 4 is voltage or the electric current sequential chart over time that is used to illustrate each several part.
Fig. 5 is the circuit diagram that other formations of voltage detecting circuit 11 and control signal generative circuit 12 are shown.
The specific embodiment
Following one side describes embodiments of the present invention on one side with reference to accompanying drawing.
Fig. 1 is the circuit diagram of an example of formation that the scalp acupuncture drive unit of the dot-matrix printer that is used in present embodiment is shown.The dot-matrix printer of present embodiment possesses scalp acupuncture drive unit as shown in Figure 1.The scalp acupuncture drive unit has scalp acupuncture drive circuit 20 and backward voltage regenerative circuit 10.
Scalp acupuncture drive circuit 20 has a plurality of scalp acupunctures, a plurality of coil 200, a plurality of switch 201 and a plurality of diode 202.In the scalp acupuncture drive circuit 20 of present embodiment,, respectively be provided with a coil 200, switch 201 and diode 202 at each scalp acupuncture.
Switch 201 is n channel fets for example, and gate terminal is connected to the microcomputer in the dot-matrix printer, and drain terminal is connected to the anode terminal of the corresponding diode 202 that is provided with, source terminal ground connection.
One end of each coil 200 is connected to the power supply that scalp acupuncture drives usefulness, and the other end is connected to the drain terminal of the corresponding switch 201 that is provided with.
The anode of each diode 202 is connected to the drain terminal of the corresponding switch 201 that is provided with, and negative electrode is connected to backward voltage regenerative circuit 10.Each diode 202 can be a silicon diode, but more preferably at the lower Schottky-barrier diode of the voltage drop of forward.
Each switch 201 is to make electric current flow through coil 200 under the situation of high level at the print control signal that is imported into gate terminal from microcomputer, utilizes the magnetic force that is produced by the electric current that flows through coil 200 to make scalp acupuncture impact recording mediums such as paper.
And, thereby when the print control signal that is imported into gate terminal be that each switch of low level 201 cuts off when flowing through the electric current of coil 200, become in the coil 200 and do not produce magnetic force, scalp acupuncture turns back to original position.At this moment, produce backward voltage owing to the cut-out of electric current in coil 200, the backward voltage that is produced is carried to backward voltage regenerative circuit 10 by diode 202.
Fig. 2 is the concept map that is used to illustrate an example of printing action.When switch 201 makes electric current flow through coil 200 under the print control signal of the microcomputer in dot-matrix printer output is the situation of high level, utilize the electric current that flows through coil 200 to produce magnetic force.
And shown in Fig. 2 (a), because the magnetic force that produced, causing metal bar 204 be that the center rotates and attracted by iron core 206 with axle 203.And the scalp acupuncture 207 that is connected to bar 204 makes China ink be with 208 to impact recording mediums 209 such as paper, forms dot image thus on recording medium 209.
In addition, back-moving spring 205 carries out the application of force to the direction away from iron core 206 to bar 204, when switch 201 flows through the electric current of coil 200 according to the print control signal cut-out of exporting from microcomputer, becomes in the coil 200 and does not produce magnetic force.Therefore, bar 204 is because the application of force of back-moving spring 205 and be that the center rotates and turns back to original position with axle 203.Thus, scalp acupuncture 207 also is with 208 to leave and turn back to original position from China ink.
Returning Fig. 1 goes on to say.Backward voltage regenerative circuit 10 possesses voltage detecting circuit 11, control signal generative circuit 12, on-off circuit 13 and smoothing circuit 14.
Voltage detecting circuit 11 makes the level variation to the signal of control signal generative circuit 12 outputs according to the size of the backward voltage that produces in the coil 200 of scalp acupuncture drive circuit 20.
The backward voltage that control signal generative circuit 12 produces the coil 200 that is transfused to expression scalp acupuncture drive circuit 20 from voltage detecting circuit 11 is under the situation of the output signal more than the assigned voltage, to on-off circuit 13 output Continuity signals, be transfused to from voltage detecting circuit 11 under the situation of this backward voltage of expression less than the output signal of this assigned voltage, to on-off circuit 13 output pick-off signals.
On-off circuit 13 is being transfused to from control signal generative circuit 12 under the situation of Continuity signal, make conducting between coil 200 and the smoothing circuit 14, be transfused to from control signal generative circuit 12 under the situation of pick-off signal, cutting off the conducting between coil 200 and the smoothing circuit 14.
The lead-out terminal of smoothing circuit 14 is connected to the positive potential side of the power supply of scalp acupuncture drive circuit 20 by diode 15, smoothing circuit 14 makes the backward voltage that utilization provides via on-off circuit 13 from coil 200 and the electric current smoothing that produces and be back to power supply.
Voltage detecting circuit 11 has resistance 110, resistance 111 and Zener diode 112.Resistance 110 and 111 is connected in series, and an end is connected to the negative electrode of each diode 202, and the other end is connected to the negative electrode of Zener diode 112.The anode of Zener diode 112 is connected to the power supply that scalp acupuncture drives usefulness.
The backward voltage that Zener diode 112 produces in, coil 200 202 that provide by diode surpasses under the situation of Zener voltage of Zener diode 112 makes current flowing resistance 110 and 111.Thus, in resistance 110, produce the voltage drop that begins from backward voltage according to the electric current that is flow through.
And along with backward voltage becomes big, the electric current that flows through resistance 110 increases, and it is big that the voltage drop of resistance 110 becomes.When backward voltage became big, the electric current that flows through resistance 110 increased, and point surpasses assigned voltage (for example 0.7V) between the voltage drop at a time of resistance 110.
Control signal generative circuit 12 has pnp transistor 120, resistance 121, resistance 122, resistance 123, resistance 124 and npn transistor 125.
The base terminal of pnp transistor 120 is connected to the node between resistance 110 and the resistance 111, and emitter terminal is connected to the negative electrode of each diode 202, and collector terminal is connected to the power supply that scalp acupuncture drives usefulness by the resistance 121 and 122 that is connected in series.
The base terminal of npn transistor 125 is connected to the node between resistance 121 and the resistance 122, and emitter terminal is connected to the power supply that scalp acupuncture drives usefulness, and collector terminal is connected to the negative electrode of each diode 202 by the resistance 123 and 124 that is connected in series.
The voltage drop of the resistance 110 in backward voltage becomes big, voltage detecting circuit 11 is during above assigned voltage (for example 0.7V), 120 conductings of pnp transistor, current flowing resistance 121 and 122.Thus, in resistance 122, produce voltage drop, surpass the 0.7V between the emitter stage-base stage of npn transistor 125,125 conductings of npn transistor.And current flowing resistance 123 and 124 produces voltage drop in resistance 123.
In addition, when the state big from backward voltage begins to descend, the voltage drop of resistance 110 in the voltage detecting circuit 11 is during less than assigned voltage, pnp transistor 120 ends, and resistance 121 and 122 electric current are cut off.Thus, no longer produce voltage drop in resistance 122, npn transistor 125 ends.And resistance 123 and 124 electric current are cut off, and the voltage of resistance 123 reduces to 0.
At this, resistance 122 and 123 resistance value are abundant high values (for example more than tens Ω), therefore control signal generative circuit 12 moves as voltage amplifier, voltage amplification that produces at the two ends of resistance 110 according to the big young pathbreaker of backward voltage and the two ends that output to resistance 123.
Therefore, if the voltage drop that produces in resistance 110 is more than the assigned voltage (for example 0.7V), then the voltage drop of resistance 123 is the voltage (for example more than tens V) that is enough to make p channel fet 130 described later (conducting resistance for roughly the state of 0 Ω) conducting in the zone of saturation.
In addition, if the voltage drop of generation is less than assigned voltage in resistance 110, then the voltage drop of resistance 123 is to be enough to make p raceway groove FE T130 described later cutting off the voltage (for example 0V) that end in zone (electric current flows through the state between drain electrode-source electrode hardly).
In addition, voltage detecting circuit 11 and the control signal generative circuit 12 positive potential side that scalp acupuncture driven the power supply of usefulness is moved as reference potential.Thus, the power consumption that can suppress in voltage detecting circuit 11 and the control signal generative circuit 12 makes it lower.In addition, can use withstand voltage low element to constitute backward voltage regenerative circuit 10, the cost that therefore can suppress backward voltage regenerative circuit 10 makes it lower.
On-off circuit 13 has p channel fet 130.The gate terminal of p channel fet 130 is connected to the node between resistance 123 and the resistance 124, and source terminal is connected to the negative electrode of each diode 202, and drain terminal is connected to smoothing circuit 14.
At this, the voltage (for example more than tens V) that control signal generative circuit 12 will be fully big is as Continuity signal output, thus p channel fet 130 (conducting resistance for roughly the state of 0 Ω) makes coil 200 and smoothing circuit 14 conductings in the zone of saturation.
On the other hand, thereby since npn transistor 125 be cut off under the situation of voltage drop less than assigned voltage (for example a few mV) of resistance 123 by the electric current of, resistance 123, the signal of this voltage drop of expression is received as pick-off signal, cut off the conducting between coil 200 and the smoothing circuit 14.
At this, the voltage (for example 0V) that control signal generative circuit 12 will be fully little is as pick-off signal output, so p raceway groove FE T130 cuts off the conducting between coil 200 and the smoothing circuit 14 in cut-out zone (electric current flows through the state between drain electrode-source electrode hardly).
Like this, make coil 200 and smoothing circuit 14 conductings during, the resistance value of p channel fet 130 is in low-down state, during the conducting between coil 200 and the smoothing circuit 14 is cut off, electric current flows through p channel fet 130 hardly, what therefore, produce in p channel fet 130 owing to flow through the electric current of p channel fet 130 is hot considerably less.
Therefore, do not need the heat dissipation equipment in (perhaps can reduce) p channel fet 130, help the minimization and the whole miniaturization of device of the substrate area of backward voltage regenerative circuit 10 integral body.And, can make electric power turn back to power supply as heat loss, so power-efficient is improved, supply unit also can miniaturization.
Smoothing circuit 14 has diode 140, coil 141 and capacitor 142.The plus earth of diode 140, negative electrode are connected to the drain terminal of p channel fet 130.One end of coil 141 is connected to the negative electrode of diode 140, and the other end is connected to an end of capacitor 142.The other end ground connection of capacitor 142.
Smoothing circuit 14 receives the electric current that produces owing to the backward voltage that provides via p channel fet 130 from coil 200 as input by the cathode terminal of diode 140.And smoothing circuit 14 makes the electric current smoothing by the cathode terminal reception of diode 140, and exports from the node between coil 141 and the capacitor 142.
Electric current by smoothing circuit 14 smoothings is back to power supply by diode 15.Diode 140 and diode 15 can be silicon diodes, and more preferably at the lower Schottky-barrier diode of the voltage drop of forward.
Then, the voltage and current to the each several part of backward voltage regenerative circuit 10 shown in Figure 1 describes over time.
Fig. 3 is used for the key diagram that the generation position to each voltage or electric current describes.
V
EcoBe the voltage that is put on backward voltage regenerative circuit 10 by the backward voltage that produces in the coil 200, expression is the voltage of benchmark in the negative electrode generation of diode 202 with the power supply that scalp acupuncture drives usefulness.
V
RBe illustrated in the resistance 110 voltage drop that produces, begin from backward voltage.V
zThe Zener voltage of expression Zener diode 112.V
GsExpression is the voltage of source terminal benchmark, p channel fet 130 with the gate terminal of p channel fet 130.
I
dThe electric current of the drain terminal of p channel fet 130 is flow through in expression.V
dBe illustrated in the voltage that produces between the negative electrode of diode 140 and ground connection.
Fig. 4 is voltage or the electric current sequential chart over time that is used to illustrate each several part.
At first, when at time point t
1, when print control signal became low level from high level, each switch 201 cut off the electric current that flows through coil 200, produces backward voltage in the coil 200.
Because at time point t
1The backward voltage that produces is according to the capacitive component of substrate and wiring and in order to suppress voltage V
EcoRapid rising and the electric capacity of the capacitor that is provided with between the negative electrode of diode 202 and ground connection puts on the voltage V of backward voltage regenerative circuit 10
EcoRise gradually.
And, when at time point t
2, voltage V
EcoReach the Zener voltage V of Zener diode 112
zThe time, electric current flows through Zener diode 112, produces voltage drop V in resistance 110
R
As voltage V
EcoWhen further rising, at time point t
3, the voltage drop V of resistance 110
RReach setting V
Th(for example 0.7V).At this, with time point t
3Voltage V
EcoValue be made as V
1
Voltage drop V when resistance 110
RReach setting V
ThThe time, 120 conductings of pnp transistor, current flowing resistance 121 and 122 produces with the electric current correspondent voltage in resistance 122 and falls.
And, when at time point t
3, when the voltage drop of resistance 122 reaches setting (for example 0.7V), 125 conductings of npn transistor, current flowing resistance 123 and 124.And, when the voltage drop of resistance 123 reaches setting (for example a few V), at time point t
4, 130 conductings of p channel fet.
In addition, the delay owing to the pnp transistor 120 in the control signal generative circuit 12, npn transistor 125 etc. causes the voltage drop V from resistance 110
RReach setting V
ThTime point t
3After playing delay Δ t, at time point t
4, 130 conductings of p channel fet.In the present embodiment, the transistorized progression in the control signal generative circuit 12 is 2 grades, but along with progression increases, it is elongated that this postpones Δ t.
And, when at time point t
4, during 130 conductings of p channel fet, based on the electric current I of the backward voltage that produces in the coil 200
dFlow through smoothing circuit 14 by p channel fet 130.Thus, to the voltage V of the negative electrode of diode 140
dApply voltage V
Eco, voltage V
EcoBegin to descend.
Then, when at time point t
5, the voltage drop V of resistance 110
RBe lower than setting V
ThThe time, pnp transistor 120 ends.Thus, the electric current that flows through resistance 121 and 122 is cut off, and the voltage of resistance 122 reduces to 0, and npn transistor 125 ends.When npn transistor 125 ended, the electric current that flows through resistance 123 and 124 was cut off, and the voltage of resistance 123 reduces to 0, at time point t
6, p channel fet 130 ends.
In addition, the delay owing to the pnp transistor 120 in the control signal generative circuit 12, npn transistor 125 etc. causes the voltage drop V from resistance 110
RBe lower than setting V
ThTime point t
5After playing delay Δ t, at time point t
6, p channel fet 130 ends.In addition, in the present embodiment, represent from time point t with identical Reference numeral Δ t
3To time point t
4Delay and from time point t
5To time point t
6Delay, but both retardations needn't be identical.
And, when at time point t
6, when p channel fet 130 ends, since the backward voltage that produces in the coil 200, voltage V
EcoBegin once more to rise.In addition, when p channel fet 130 ended, the current potential of the node between diode 140 and the coil 141 was for negative, and electric current flows the voltage V of the negative electrode of diode 140 by diode 140
dBegin to produce the forward drop of diode 140 from earthing potential, become negative 1V degree.
Like this, in the backward voltage regenerative circuit 10 of present embodiment, if put on the voltage V of backward voltage regenerative circuit 10
EcoRise gradually owing to the backward voltage that produces in the coil 200, then detect voltage V at voltage detecting circuit 11
EcoReached assigned voltage when above, control signal generative circuit 12 makes the signal of on-off circuit 13 conductings to on-off circuit 13 outputs.
And on-off circuit 13 conductings flow to smoothing circuit 14 by on-off circuit 13, voltage V based on the electric current of the backward voltage that produces in the coil 200
EcoDescend gradually.And, detect voltage V at voltage detecting circuit 11
EcoDuring less than assigned voltage, the signal that control signal generative circuit 12 ends on-off circuit 13 to on-off circuit 13 outputs.And on-off circuit 13 ends, thus voltage V
EcoDecline stop, if in coil 200 the remaining energy that has based on backward voltage, then voltage V
EcoRise once more.
And, voltage V
EcoRise repeatedly and descend, p channel fet 130 conducting and ending repeatedly, till the depleted of energy based on backward voltage in coil 200, that is, even if until p channel fet 130 is ended, voltage V
EcoCan not make resistance 110 produce V owing to the backward voltage that produces in the coil 200 reaches yet
ThThe voltage V of voltage drop
1Till.
And the electric current smoothing that is provided intermittently by p channel fet 130 is provided smoothing circuit 14, and the diode 15 of the adverse current by being used to prevent electric current is back to the power supply that scalp acupuncture drives usefulness.
At this, voltage V
EcoThe upper limit V of the scope that rises repeatedly and descend
UStipulate by the withstand voltage of the parts that constitute backward voltage regenerative circuit 10.In addition, the voltage V that rises repeatedly and descend
EcoAverage voltage depend on the formation of the smoothing circuit that produces which kind of voltage source.
For example, use 42V as scalp acupuncture drive usefulness power supply, constitute under the situation of smoothing circuit 14 as shown in Figure 1, if the electric current smoothing based on the voltage that provides with for example about 50% dutycycle (duty ratio) is provided, if voltage is 0V roughly between cut-off region, then under the situation of the current drain in considering smoothing circuit, at the interval voltage that needs about about 100V of conducting.
In fact, as shown in Figure 4, at time point t from 130 conductings of p channel fet
4To time point t
6Till during, the voltage V that is descending
EcoTherefore be provided for smoothing circuit 14, be preferably designed to: the average voltage of 130 conduction periods of p channel fet is about 100V.
In addition, under the situation that the electric current that flows through coil 200 by cut-out finishes to print, produce backward voltage in the coil 200, suppose electric current based on this backward voltage along with the time slowly disappears, then electric current continues to flow through coil 200 in this loss process.Therefore, produce magnetic force in the coil 200, the scalp acupuncture after obstruction is printed turns back to the action of original position, and scalp acupuncture can knock recording mediums such as China ink band, paper sometimes.
Therefore, in order to realize printing fast, need after printing, make scalp acupuncture turn back to original position rapidly.In the present embodiment, consider translational speed to the end, the speed of paper feeding etc., be designed to: after the printing for example tens μ make current vanishes in second based on the backward voltage that produces in the coil 200.
For the electric current based on the backward voltage that produces in the coil 200 is comparatively fast disappeared, preferably improve voltage V
EcoThe lower limit VL of the scope that rises repeatedly and descend.But, as previously mentioned, because the restriction of formation of withstand voltage, the smoothing circuit that produces which kind of voltage source of parts etc. can't change voltage V
EcoThe upper limit V of mobility scale
U, voltage V
EcoAverage voltage.
Also consider by being thereby that the center switches p channel fet 130 to make voltage V fast with designed average voltage
EcoIn narrow mobility scale, change, but the upper limit of the operating frequency of p channel fet 130 is a few mHz degree, therefore p channel fet 130 is switched more quickly than this upper limit.
Therefore, about voltage V
EcoThe lower limit V of the scope that rises repeatedly and descend
L, for the restriction of formation of both observing the withstand voltage of parts and producing the smoothing circuit of which kind of voltage source, this lower limit V is set on the highland as far as possible again
L, thereby this lower limit V
LThe upper limit that depends on the frequency that can make 130 switchings of p channel fet.
More than embodiments of the present invention are illustrated.
As seen from the above description:, can improve among the electric power of the backward voltage that in the coil 200 that drives usefulness based on scalp acupuncture, produces, be reproduced to the shared ratio of electric power of power supply, and the heating of element is reduced according to the dot-matrix printer of present embodiment.
In addition, the present invention is not limited to above-mentioned embodiment, comprises various variation.For example, in the above-described embodiment, voltage detecting circuit 11 is made of resistance and Zener diode, but the invention is not restricted to this.
For example, can be as follows comparator: it will put on the voltage V of backward voltage regenerative circuit 10 based on the backward voltage that produces in the coil 200
EcoWith predefined voltage ratio, the level to the signal of control signal generative circuit 12 output is changed.In addition, voltage detecting circuit 11 and control signal generative circuit 12 can be made of for example differential amplifier.
In addition, voltage detecting circuit 11 and control signal generative circuit 12 in the above-mentioned embodiment are not limited to formation shown in Figure 1, for example can be formations as shown in Figure 5.
Fig. 5 is the circuit diagram that other formations of voltage detecting circuit 11 and control signal generative circuit 12 are shown.Voltage detecting circuit 11 has Zener diode 300 and resistance 301.The negative electrode of Zener diode 300 is connected to the negative electrode of diode 202, and the anode of Zener diode 300 is connected to the power supply that scalp acupuncture drives usefulness by resistance 301.
Control signal generative circuit 12 has resistance 302, resistance 303 and n channel fet 304.Resistance 302 and resistance 303 are connected in series, and an end is connected to the negative electrode of diode 202, and the other end is connected to the drain terminal of n channel fet 304.The gate terminal of n channel fet 304 is connected to the anode of Zener diode 300, and source terminal is connected to the power supply that scalp acupuncture drives usefulness.
When the negative electrode that puts on Zener diode 300, based on the voltage V of the backward voltage of coil 200
EcoRise, and when surpassing the Zener voltage of Zener diode 300, electric current flows through Zener diode 300 and resistance 301, when the voltage drop of resistance 301 reaches setting, 304 conductings of n channel fet.
When 304 conductings of n channel fet, current flowing resistance 302 and 303, when the voltage drop of resistance 302 reaches setting, 130 conductings of p channel fet.If the voltage drop that produces in resistance 302 by making 304 conductings of n channel fet is to be enough to make the voltage drop of p channel fet 130 in the zone of saturation conducting, then this formations also can make p channel fet 130 in the zone of saturation conducting, end in the cut-out zone.
In addition, in this formation, the transistorized progression in the control signal generative circuit 12 are 1 grade, therefore compare with the formation of control signal generative circuit 12 shown in Figure 1, have the short characteristic at delay Δ t illustrated in fig. 4.When postponing Δ t in short-term, can make it in the scope of the frequency characteristic of p channel fet 130, to switch more quickly.
In addition, on-off circuit 13 shown in Figure 1 also can and with charge pump etc., constitute by for example n channel fet.
More than use embodiment that the present invention has been described, but technical scope of the present invention is not limited to the scope of above-mentioned embodiment record.Those skilled in the art can apply various changes or improvement to above-mentioned embodiment certainly.In addition, the record by claims can clearly also can be contained in technical scope of the present invention through the scheme after such change or the improvement.
Reference numeral
10: the backward voltage regenerative circuit; 11: voltage detecting circuit; 110: resistance; 111: resistance; 112: Zener diode; 12: the control signal generative circuit; The 120:pnp transistor; 121: resistance; 122: resistance; 123: resistance; 124: resistance; The 125:npn transistor; 13: on-off circuit; The 130:p channel fet; The 131:n channel fet; 14: smoothing circuit; 140: diode; 141: coil; 142: capacitor; 15: diode; 20: the scalp acupuncture drive circuit; 200: coil; 201: switch; 202: diode; 203: axle; 204: bar; 205: back-moving spring; 206: iron core; 207: scalp acupuncture; 208: the China ink band; 209: recording medium; 300: Zener diode; 301: resistance; 302: resistance; 303: resistance; The 304:n channel fet; 305: resistance; 306: Zener diode; The 307:p channel fet; 308: resistance; 309: resistance.
Claims (8)
1. backward voltage regenerative circuit that is used in dot-matrix printer, this backward voltage regenerative circuit is characterised in that to possess:
Voltage detecting circuit;
The control signal generative circuit;
On-off circuit; And
Smoothing circuit,
The size of the backward voltage that produces in the coil of aforesaid voltage testing circuit according to the scalp acupuncture drive circuit changes the level to the signal of aforementioned control signal generative circuit output,
Aforementioned control signal generative circuit has reached under the situation of the output signal more than the assigned voltage being transfused to the aforementioned backward voltage of expression from aforementioned voltage detecting circuit, to aforementioned on-off circuit output Continuity signal,
Aforementioned control signal generative circuit is being transfused to from aforementioned voltage detecting circuit under the situation of the aforementioned backward voltage of expression less than the output signal of aforementioned assigned voltage, to aforementioned on-off circuit output pick-off signal,
The aforementioned switches circuit is being transfused under the situation of aforementioned Continuity signal, makes conducting between aforementioned coil and the aforementioned smoothing circuit,
The aforementioned switches circuit is being transfused under the situation of aforementioned pick-off signal, cuts off the conducting between aforementioned coil and the aforementioned smoothing circuit,
The lead-out terminal of aforementioned smoothing circuit is connected to the positive potential side of the power supply of aforementioned scalp acupuncture drive circuit, and aforementioned smoothing circuit makes the electric current smoothing that produces owing to the aforementioned backward voltage that is provided via the aforementioned switches circuit from aforementioned coil and is back to power supply.
2. backward voltage regenerative circuit according to claim 1 is characterized in that,
The aforesaid voltage testing circuit connects in the mode of the size of the backward voltage that produces in the coil that can detect aforementioned scalp acupuncture drive circuit,
Aforementioned control signal generative circuit connects in the mode of the output signal that is transfused to the aforesaid voltage testing circuit,
The aforementioned switches circuit is located between the coil and aforementioned smoothing circuit of aforementioned scalp acupuncture drive circuit, be transfused under the situation of aforementioned Continuity signal from aforementioned control signal generative circuit, make conducting between this coil and this smoothing circuit, make this smoothing circuit of current direction that produces owing to the backward voltage that produces in this coil, the backward voltage that produces in this coil is descended
Be transfused under the situation of aforementioned pick-off signal less than aforementioned assigned voltage and from aforementioned control signal generative circuit owing to the decline of this backward voltage at this backward voltage, cut off the conducting between this coil and this smoothing circuit, cut off because the electric current that the backward voltage that produces in this coil produces mobile to this smoothing circuit makes the decline of the backward voltage that produces in this coil stop thus.
3. backward voltage regenerative circuit according to claim 1 is characterized in that,
The aforesaid voltage testing circuit changes the level of the signal of output by making aforementioned backward voltage and aforementioned assigned voltage comparison.
4. backward voltage regenerative circuit according to claim 3 is characterized in that,
The aforesaid voltage testing circuit is made of differential amplifier,
Aforementioned control signal generative circuit is contained in the aforementioned differential amplifier.
5. according to claim 3 or 4 described backward voltage regenerative circuits, it is characterized in that,
Aforementioned control signal generative circuit after the process stipulated time, is imported aforementioned Continuity signal to aforementioned on-off circuit at the signal that the aforementioned backward voltage of expression has reached more than the aforementioned assigned voltage after aforementioned voltage detecting circuit is output,
Aforementioned control signal generative circuit after the process stipulated time, is imported aforementioned pick-off signal to aforementioned on-off circuit less than the signal of aforementioned assigned voltage at the aforementioned backward voltage of expression after aforementioned voltage detecting circuit is output.
6. according to each the described backward voltage regenerative circuit in the claim 1 to 5, it is characterized in that,
The aforementioned switches circuit is a transistor,
Aforementioned Continuity signal is the signal that aforementioned transistor is moved in the zone of saturation,
Aforementioned pick-off signal is to make aforementioned transistor cut off the signal that move in the zone.
7. the described backward voltage regenerative circuit of each in the claim 1 to 6 is characterized in that,
Aforesaid voltage testing circuit and aforementioned control signal generative circuit move as reference potential with the positive potential side of the power supply of aforementioned scalp acupuncture drive circuit.
8. a dot-matrix printer is characterized in that, has each the described backward voltage regenerative circuit in the claim 1 to 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012010772A JP2013146976A (en) | 2012-01-23 | 2012-01-23 | Reverse electromotive voltage regeneration circuit and dot impact printer |
| JP2012-010772 | 2012-01-23 |
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| Publication Number | Publication Date |
|---|---|
| CN103213412A true CN103213412A (en) | 2013-07-24 |
| CN103213412B CN103213412B (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310027124.4A Active CN103213412B (en) | 2012-01-23 | 2013-01-18 | Backward voltage regeneration circuit and dot matrix printer |
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| Country | Link |
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| JP (1) | JP2013146976A (en) |
| CN (1) | CN103213412B (en) |
Cited By (1)
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|---|---|---|---|---|
| CN108237791A (en) * | 2016-12-27 | 2018-07-03 | 精工爱普生株式会社 | Printer |
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| JP2003284332A (en) * | 2002-03-26 | 2003-10-03 | Seiko Epson Corp | Self-excited regeneration circuit |
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| JP2002154223A (en) * | 2000-11-17 | 2002-05-28 | Seiko Epson Corp | Liquid consumption state detector |
| JP2004078130A (en) * | 2002-06-18 | 2004-03-11 | Nippon Signal Co Ltd:The | Synchronizing signal detection device for electromagnetic actuator and electromagnetic actuator using same |
| JP2005007678A (en) * | 2003-06-18 | 2005-01-13 | Seiko Epson Corp | Head driving circuit of impact printer |
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| CN108237791A (en) * | 2016-12-27 | 2018-07-03 | 精工爱普生株式会社 | Printer |
| CN108237791B (en) * | 2016-12-27 | 2019-12-03 | 精工爱普生株式会社 | Printer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2013146976A (en) | 2013-08-01 |
| CN103213412B (en) | 2015-07-15 |
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