CN205489774U - Power supply unit and printer - Google Patents
Power supply unit and printer Download PDFInfo
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- CN205489774U CN205489774U CN201620016965.4U CN201620016965U CN205489774U CN 205489774 U CN205489774 U CN 205489774U CN 201620016965 U CN201620016965 U CN 201620016965U CN 205489774 U CN205489774 U CN 205489774U
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- 238000012360 testing method Methods 0.000 claims description 18
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- 238000004804 winding Methods 0.000 description 17
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
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Abstract
The utility model provides even under the great condition of load current's change, also can suitably provide the power supply unit and printer of electric power. For this reason, based on alternating current provides direct current's AC converter (3) to the load in, possess the power supply circuit of the voltage reduction characteristic that has a plurality of output voltage for the load current that offers thermal printer (4), power supply circuit becomes under the condition of specific state at load current's current value, switches the voltage reduction characteristic.
Description
Technical field
This utility model relates to supply unit and possesses the printer of this supply unit.
Background technology
In the past, it is known that in the supply unit such as AC transducer that electric power is provided, utilize and export electric current
The characteristic that makes output voltage decline together is the most so-called, and " Off word is (with output electric current as transverse axis, with defeated
Go out in the curve chart that voltage is the longitudinal axis, describe the spy of the line similar to the character of the assumed name of Japanese " Off "
Property) " dropping characteristic, carry out the technology (referring for example to patent documentation 1) of overcurrent protection
But, for there is the supply unit of " Off word " dropping characteristic, in the variation loaded relatively
In the case of great, it is possible to the offer of suitable electric power can not be provided.Such as, at supply unit thermotropism
In the case of the print head of quick printer provides power supply, according to printed content, quilt in print head
The quantity of the heater element of energising changes significantly.Therefore, the electric current of load is flowed to from supply unit
Variation is relatively big, such as when being energized to a lot of heater elements, according to the characteristic of supply unit under voltage
Fall, exists and can not suitably provide to print head electric power such worry.
Patent documentation 1:JP JP 2005-160241 publication
Utility model content
This utility model is made in view of the foregoing, even if its object is to provide a kind of change in load
It also is able to suitably provide supply unit and the printer of electric power in the case of moving relatively greatly.
In order to reach above-mentioned purpose, supply unit of the present utility model is characterised by, described power supply fills
Putting is the supply unit of the printer that DC current is supplied to load based on alternating current, and it possesses
There are at least 3 voltages relative to the output voltage of the load current being supplied to described load and decline spy
The power circuit of property, described power circuit becomes specific state at the current value of described load current
In the case of, switch described dropping voltage characteristic.
Thus, even if in the case of the variation of load current is relatively big, it is also possible to by under switching voltage
Drop characteristic, carries out the supply of suitable electric power.
Additionally, supply unit of the present utility model is characterised by, described power circuit has the 1st electricity
Drops characteristic, the 2nd dropping voltage characteristic and the 3rd dropping voltage characteristic, described 1st voltage declines
Personality presentation is with the characteristic that described output voltage declines that increases of described load current, described 2nd electricity
Drops personality presentation with the described output voltage of increase of described load current with than described 1st voltage
Gradient that dropping characteristic is milder and the characteristic that declines, described 3rd dropping voltage characteristic represents adjoint
The characteristic declining the decline of described output voltage of described load current.
Additionally, supply unit of the present utility model is characterised by, described power circuit is with described negative
Current-carrying increase switches to described 2nd dropping voltage characteristic from described 1st dropping voltage characteristic, and
Described 3rd dropping voltage characteristic is switched to the decline of described load current.
Thereby, it is possible to carry out the supply of suitable electric power, and overcurrent protection can be carried out.
Additionally, supply unit of the present utility model is characterised by, described power circuit possesses: detection
Portion, its situation that described load current becomes described specific state detects；And switching part,
Its testing result based on described test section, switches described dropping voltage characteristic.
Thus, even if in the case of the variation of load current is relatively big, also due to detection load current is also
Switching dropping voltage characteristic, therefore, it is possible to suitably provide electric power.
Additionally, supply unit of the present utility model is characterised by, described test section is at described load electricity
The current value of stream becomes switching output in the case of specific current value, and described switching part is according to described inspection
The output in survey portion, switches described dropping voltage characteristic.
Thus, even if in the case of the variation of load current is relatively big, it is also possible to suitably provide electric power.
Additionally, supply unit of the present utility model is characterised by, described power circuit is to comprise switch
The on-off mode of circuit, described switching part becomes specific current value at the current value of described load current
In the case of, changed by the frequency making described on-off circuit and switch described voltage decline spy
Property.
Additionally, supply unit of the present utility model is characterised by, described power circuit has: once
Lateral circuit, it comprises described on-off circuit；And secondary side circuit, it couples with described primary side circuit,
Described DC current is supplied to described load, in described secondary side circuit side, possesses: reference voltage
Circuit；Bleeder circuit, it carries out dividing potential drop to the described output voltage of described secondary side circuit；The most electric
Road, branch pressure voltage and the reference voltage of described bleeder circuit are compared by it；And feedback circuit, its
Comparative result based on described comparison circuit makes the frequency of described on-off circuit change, described in cut
The portion that changes switches described dropping voltage characteristic by making the branch pressure voltage of described bleeder circuit change.
Thus, dropping voltage characteristic is switched by making reference voltage change such that it is able to suitably
Ground provides electric power.
Additionally, supply unit of the present utility model is characterised by, it is that described power circuit is by framework
The AC transducer type covered.
Thereby, it is possible to make the power circuit of switching dropping voltage characteristic be adapted to AC transducer.
In order to reach above-mentioned purpose, printer of the present utility model is characterised by possessing: print head,
It has multiple printed elements fixing on the direction intersected with the conveying direction of printed medium；And electricity
Source circuit, it is based on alternating current to described print head offer DC current, and described power circuit has
At least 3 voltages relative to the output voltage of the load current being supplied to described print head decline spy
Property, and in the case of the current value of described load current becomes specific state, switch described voltage
Dropping characteristic.
Thus, by the dropping voltage characteristic of Switching power device, even if thus from supply unit stream
In the case of the variation of the load current of print head is relatively big, it is also possible to print head is suitably provided electricity
Power.Therefore, even if the quantity of the printed element being energized in print head changes such feelings significantly
Under condition, it is also possible to print on printed medium to high-quality.
Accompanying drawing explanation
Fig. 1 is the figure of the composition representing the print system involved by the 1st embodiment.
Fig. 2 is the block diagram of the schematic configuration representing thermal printer.
Fig. 3 is the figure representing dropping voltage characteristic.
Fig. 4 is the figure of the sequential chart representing AC transducer.
Fig. 5 is the figure of the composition representing the thermal printer involved by the 2nd embodiment.
Detailed description of the invention
1st embodiment
Fig. 1 is the figure of the composition representing print system 1.Print system 1 shown in Fig. 1 possesses temperature-sensitive
Printer 4 and covered the AC transducer 3 (supply unit) of power circuit by framework, should
Power circuit provides power supply and by primary side circuit 3A and secondary side circuit for heat sensitive printer 4
3B is constituted.
AC transducer 3 is connected with commercial ac power source 2 via cable, such as to exchange 100 volts
Commercial ac power source 2 carry out rectification, smooth and voltage transformation, print via cable heat sensitive
Machine 4 provides the unidirectional current of 24 volts.AC transducer 3 is configured to dismount in heat via adapter
Quick printer 4.
AC transducer 3 carries out the mistake of protection load in the case of the abnormal generation such as short circuit, overload
Current protection makes not export overcurrent.For this overcurrent protection, it may be considered that by AC transducer
The characteristic of 3 is set to the characteristic such as making output voltage slowly decline with the increase of load current, i.e.
It is so-called that " ヘ word (in the output electric current curve chart as transverse axis, with output voltage as the longitudinal axis, is retouched
Paint the characteristic of the similar line of katakana " ヘ " character to Japanese) " dropping characteristic is (under the 1st voltage
Drop characteristic).Additionally, for example, it is possible to consider to be set to become special with the output electric current of AC transducer 3
The situation of fixed current value is separation, along with output electric current reduces and the what is called of output voltage decline
" Off word " dropping characteristic (the 2nd and the 3rd dropping voltage characteristic).
Thermal printer 4 conveying is contained in the not shown sensible heat roll web (printed medium) of main body cover
Print.
Fig. 2 is the block diagram of the schematic configuration representing thermal printer 4.
As in figure 2 it is shown, thermal printer 4 possesses many heater elements (printed element) 41
The line thermal head 42 linearly configured.The arrangement of the heater element 41 in line thermal head 42
Direction is the direction orthogonal with the conveying direction of sensible heat roll web.Line thermal head 42 is fixed.Heat
Quick printer 4 by being energized to the heater element 41 of line thermal head 42, the print to sensible heat roll web
Brush finish applies hot, thus printing word, image etc..Driven like that at many heater elements 41
Printing dutycycle higher in the case of, can the bigger load current of moment flowing.
Thermal printer 4 possesses the printing of the energising of the heater element 41 controlling parallel type thermal head 42
Head drive division 43.Additionally, thermal printer 4 possesses for carrying the not shown defeated of sensible heat roll web
Send roller and drive the conveying motor 44 of conveying roller.Print head drive division 43 and conveying motor
44 are connected with power supply unit 45, accept power supply to perform action from power supply unit 45.
Additionally, print head drive division 43 and conveying motor 44 are connected with control portion 46.Control
Portion 46 controls print head drive division 43, each heater element possessed with parallel type thermal head 42
41 are energized.Additionally, control portion 46 controls conveying motor 44, to be carried by conveying roller
Sensible heat roll web.While conveying sensible heat roll web, the line thermal head 42 fixed is driven to exist
Print on sensible heat roll web.
Power supply unit 45 is connected with AC transducer 3, from AC transducer 3 input direct-current electric current.
In the line thermal head 42 of thermal printer 4, the quantity root of the heater element 41 being energized
Change according to printed content.As the index of the quantity of the heater element 41 being energized,
Can use represent set in given printing zone printable count with actual print count
The printing dutycycle of ratio.
Such as, situation about at thermal printer 4, the printed data that printing dutycycle is higher being printed
Under, due to the heater element 41 that is energized in the heater element 41 that line thermal head 42 is possessed
Quantity is more, and therefore the load current from the flowing of AC transducer 3 heat sensitive printer 4 increases.?
In the case of Gai, if the characteristic of AC transducer 3 be above-mentioned " ヘ word " dropping characteristic, then with negative
Current-carrying increase and output voltage can decline.And then, even if having exceeded rated current at load current
State under be also possible to provide electric power from AC transducer 3 heat sensitive printer 4, worry whether
Enough it is reliably achieved overcurrent protection.
On the other hand, in above-mentioned example, the characteristic at AC transducer 3 is above-mentioned " Off word "
In the case of dropping characteristic, if load current increases and reaches specific current value, then according to " Off word "
Dropping characteristic, along with load current reduces and output voltage decline.If control portion 46 detects supply
The decline of voltage, then detect low-voltage mistake, if service voltage becomes more to prevent undesirable condition
Low, make thermal printer 4 shut down (shutdown) sometimes.Even if that is, short circuit, overload etc.
Extremely not occurring, thermal printer 4 is also possible to stop due to mistake or shut down.Additionally,
For general printer, in order to recover from low-voltage mistake, shutdown, need electricity
Source switch turns off/connects the operation etc. of (OFF/ON), and thermal printer 4 is also same.
Therefore, the AC transducer 3 of present embodiment has " ヘ word " as dropping voltage characteristic
Dropping characteristic and " Off word " dropping characteristic, and possess and switch dropping voltage characteristic according to load current
Composition.
AC transducer 3 shown in Fig. 1 connects commercial ac power source 2 at primary side circuit 3A,
Secondary side circuit 3B connects thermal printer 4.AC transducer 3 will be from commercial ac power source 2 to one
The input voltage vin of secondary lateral circuit 3A input is transformed to output voltage Vout, and by output voltage
Vout exports thermal printer 4.
Primary side circuit 3A comprises rectification circuit S31, the electrolysis electricity being connected with commercial ac power source 2
Container C31, a winding L1 and on-off circuit K11 of transformator TR.At primary side circuit 3A
In, the input voltage vin as alternating voltage passes through rectification circuit S31 and electrolysis condenser C31
And be rectified, smooth.And then, it is configured to the switch motion by on-off circuit K11, to executing
It is added on the circuit of the on-off mode that the voltage of a winding L1 is controlled.
On-off circuit K11 possesses control IC (Integrated Circuit, integrated circuit) 111 and crystal
Pipe Q1.Transistor Q1 uses FET in the present embodiment.Control IC111 to have and transistor
The lead-out terminal that the grid of Q1 connects.Control the IC111 output according to photoelectrical coupler Pc described later,
The voltage being input to the grid of transistor Q1 is made to be changed.Specifically, IC111 is controlled to crystalline substance
The grid voltage pulse output of body pipe Q1, makes transistor Q1 turn on/off, thus transistor Q1
Carry out switch motion.Control IC111 by controlling pulse width according to the output of photoelectrical coupler Pc
Degree, thus control the on-off time of transistor Q1.
Secondary side circuit 3B comprises winding i.e. Secondary Winding L2 of the secondary side of transformator TR, rectification
Element S32 and electrolysis condenser C32.If a winding L1 of primary side circuit 3A is applied voltage,
Then the sensing of Secondary Winding L2 and the number of windings of a winding L1 and Secondary Winding L2 the number of windings it
Than corresponding voltage.The induced voltage of Secondary Winding L2 passes through rectifier cell S32 and electrochemical capacitor
Device C32 and be rectified and smooth, and export to thermal printer 4.
So, if making to put on the electricity of a winding L1 by the switch motion of on-off circuit K11
Pressure changes, then the voltage sensed in Secondary Winding L2 changes, secondary side circuit 3B
Output voltage Vout changes.
Secondary side circuit 3B, between lead-out terminal OUT and lead-out terminal GND, possesses detection electricity
Road K21 (test section) and switching circuit K22 (switching part).
AC transducer 3 is exported to the output electric current of thermal printer 4, i.e. flows by testing circuit K21
Current value to the load current of load detects.Testing circuit K21 possesses resistance R1, resistance
R5, resistance R6 and comparator (comparator) CU.One end of resistance R1 and lead-out terminal GND
Connecting, the other end is connected with resistance R6.Resistance R6 is connected in series with resistance R5, resistance R5 with
Lead-out terminal GND connects.That is, between lead-out terminal OUT and lead-out terminal GND, series connection
Connect resistance R5, R6, R1.
Comparator CU is made up of operational amplifier.The reversed input terminal of comparator CU (-) with
The node P1 connected by resistance R5 and resistance R6 connects, non-inverting input terminal (+) and output
Terminal GND connects.Comparator CU the voltage detected by reversed input terminal less than by non-instead
In the case of the voltage that phase input terminal detects, to transistor Q2 described later input " High " electricity
Flat signal.Additionally, at the voltage detected by reversed input terminal higher than by non-inverting input terminal
In the case of the voltage detected, comparator CU is to the letter of transistor Q2 input " Low " level
Number.
The voltage that the reversed input terminal of comparator CU is detected can be represented by following formula (1).
V (-)=Vout/ (R5+R6) (1)
In above formula, V (-) represent the magnitude of voltage of voltage that reversed input terminal is detected.Additionally,
R5 represents the resistance value of resistance R5, and R6 represents the resistance value of resistance R5.
The magnitude of voltage of the voltage that the non-inverting input terminal of comparator CU is detected can be by following formula (2)
Represent.
V (+)=Iout × R1 (2)
In above formula, V (+) represent the magnitude of voltage of voltage that non-inverting input terminal is detected, Iout
Represent the current value of the load current flowing to load.Additionally, R1 represents the resistance value of resistance R1.
Switching circuit K22 possesses resistance R2, resistance R3, resistance R4 and transistor Q2.Resistance
R2 and resistance R3 is connected in series, and one end of resistance R2 is connected with lead-out terminal OUT, resistance R3
One end be connected with lead-out terminal GND via resistance R1.One end of resistance R4 and transistor Q2
Colelctor electrode connect, the other end of resistance R4 is connected with lead-out terminal OUT.Transistor Q2 sends out
The node P2 that emitter-base bandgap grading is connected with by resistance R2 and resistance R3 connects.The output signal of comparator CU
Being input to the base stage of transistor Q2, transistor Q2 is " Low " in the output signal of comparator CU
Disconnect in the case of level, connect in the case of " High " level.If transistor Q2 connects,
Then resistance R2 and resistance R4 is connected in parallel.
In shunt regulator SA (comparison circuit), possess in inside and there is 2.5 volts etc. given
The reference voltage circuit of reference voltage.Shunt regulator SA is connected at node P2.Shunt regulator
SA is such as made up of IC, in the case of transistor Q2 disconnects, and the two ends to Secondary Winding L2
Voltage is by voltage (the hereinafter referred to as P2 voltage of the node P2 after resistance R2 and resistance R3 dividing potential drop
(dividing potential drop of output voltage Vout)) and the reference voltage of internal reference voltage circuit compare.
Between the output and lead-out terminal OUT of shunt regulator SA, connect via current limitation resistor
The light emitting diode Dp of photoelectrical coupler Pc (feedback circuit).
In the case of P2 voltage exceedes reference voltage, situation about i.e. rising at output voltage Vout
Under, shunt regulator SA makes current direction photoelectrical coupler Pc.Thus, photoelectrical coupler Pc is constituted
Light emitting diode Dp luminous.The light sent from light emitting diode Dp by with light emitting diode Dp mono-
The phototransistor Qp light of composition photoelectrical coupler Pc.Then, if phototransistor Qp
Light, then flow between the colelctor electrode of phototransistor Qp, emitter stage feedback current.Control IC111
Based on this feedback current, control the pulse to transistor Q1 output and put on a winding L1 to reduce
Voltage, make output voltage Vout decline.
On the other hand, in the case of P2 voltage is less than reference voltage, i.e. output voltage Vout declines
In the case of, shunt regulator SA does not make current direction photoelectrical coupler Pc.Therefore, photoelectricity is brilliant
Do not flow between the colelctor electrode of body pipe Qp, emitter stage feedback current.Thus, control IC111 to control
Transistor Q1 makes the voltage putting on a winding L1 increase, and makes output voltage Vout increase.
So, shunt regulator SA, in the case of P2 voltage exceedes reference voltage, makes output voltage
Vout declines, and makes output voltage Vout increase in the case of P2 voltage is less than reference voltage.That is,
Shunt regulator SA controls output voltage Vout and makes P2 voltage equal with reference voltage.At crystal
In the case of pipe Q2 disconnects, resistance R2 and resistance R3 is the bleeder circuit of output voltage Vout.
Shunt regulator SA is by using the P2 Control of Voltage as dividing potential drop being now and internal reference voltage
The internal reference voltage of circuit is equal, thus controls to flow to the light emitting diode Dp of photoelectrical coupler Pc
Dynamic electric current.Therefore, AC transducer 3 can be by based on resistance R2 and the dividing potential drop of resistance R3
Circuit, shunt regulator SA, photoelectrical coupler Pc and on-off circuit K11, make output voltage
Vout is changed.In the case of transistor Q2 connects, resistance R2 in parallel and resistance R4,
The resistance R3 connected with them is the bleeder circuit of output voltage Vout, resistance R2 and resistance R4
And the voltage of the node P2 between resistance R3 is dividing potential drop.
The dividing potential drop being input to shunt regulator SA is to turn on also being off according to transistor Q2 and different.
As it has been described above, shunt regulator SA is controlled for P2 voltage is equal with internal reference voltage by control
Output voltage Vout processed.In the case of transistor Q2 disconnects, P2 voltage is by resistance R1, electricity
Resistance R2 and resistance R3 carries out the voltage after dividing potential drop to output voltage Vout.Hereinafter, in order to simplify
Illustrate, the both end voltage of resistance R2, R3 of being connected in series is set to voltage Vout '.Voltage Vout '
Be the induced voltage of Secondary Winding L2 is carried out rectification, smooth after voltage.
Output voltage is represented by formula (3) shown below and formula (4).
If the voltage Vout ' in the case of being disconnected by transistor Q2 is set to voltage Vout1 ', then voltage
Vout1 ' is represented by following formula (3).
Vout1 '=Vref × (R2+R3)/R3 (3)
In above formula, Vref represents the magnitude of voltage of the reference voltage of the inside of shunt regulator SA, R2
Representing the resistance value of resistance R2, R3 represents the resistance value of resistance R3.In the present embodiment, brilliant
Output voltage Vout in the case of body pipe Q2 disconnects is set as 24 volts, and voltage Vout1 ' is by defeated
The value going out voltage Vout and resistance R1 determines.
On the other hand, if the voltage Vout ' in the case of being connected by transistor Q2 is set to voltage
Vout2 ', then voltage Vout2 ' is represented by following formula (4).In the case of transistor Q2 connects,
The voltage of the node P2 between the resistance R3 that resistance R2 in parallel and resistance R4 connects with them is
The dividing potential drop of Vout.
Vout2 '=Vref × ((R2 × R4/ (R2+R4))+R3)/R3 (4)
In above formula, R4 represents the resistance value of resistance R4.In the present embodiment, transistor Q2
Output voltage Vout in the case of connection is 20 volts, and voltage Vout2 ' is by output voltage Vout
Determine with the value of resistance R1.
Fig. 3 is the chart of the dropping voltage characteristic representing AC transducer 3, and the longitudinal axis represents voltage Vout '
Magnitude of voltage, transverse axis represents the current value of the load current Iout flowing to thermal printer 4.In figure,
Ve ' represents that the threshold value of the output voltage Vout becoming low-voltage mistake with thermal printer 4 is corresponding
The magnitude of voltage of voltage Vout ', in the present embodiment Ve '=17 volt.
If the electric current flowing to thermal printer 4 increases, then voltage Vout ' decline, therewith output voltage
Vout declines (the 1st dropping voltage characteristic).The point that voltage Vout ' transfers to decline is set under voltage
Fall point O1, is set to I1 by the value of the load current Iout at voltage drop point O1.
If current value increases further, then the dropping voltage characteristic switching of AC transducer 3.By voltage
The point that the switching of dropping characteristic occurs is set to characteristic switching point O2, by the load at characteristic switching point O2
The current value of electric current Iout is set to I2.Additionally, in figure 3, current value I3 represents in AC conversion
Device 3 starts the value of load current Iout at over-current protection point O3 of overcurrent protection.
As shown in Figure 3, AC transducer 3 is that I2 area below illustrates " ヘ at load current Iout
Word " dropping characteristic, " Off word " dropping characteristic, if load current Iout is more than I2, is shown.
That is, if load current Iout increases and exceedes current value I1, then AC transducer 3 is according to " ヘ
Word " dropping characteristic, make voltage Vout ' slowly decline from the voltage Vout1 ' of voltage drop point O1.
If load current Iout increases and further more than I2, then at the testing circuit of AC transducer 3
In K21, the input voltage V of the non-inverting input terminal of comparator CU (+) go above anti-phase
The input voltage V of input terminal (-).Due to input voltage V (+) ＞ input voltage V (-),
Therefore the level of the signal that comparator CU exports to the base stage of transistor Q2 becomes " High ".
If describing in detail, then in the case of the value at load current Iout is more than I2, input voltage V
(+) and input voltage V (-) relation become V (+) ＞ V (-), following formula (5)
Relation set up.
R1 × Iout ＞ Vout/ (R5+R6) (5)
That is, in the case of the current value at load current Iout is I2, V (+)=V (-) is become,
If load current Iout more than I2, becomes V (+) ＞ V (-).Therefore, comparator CU to
The signal of transistor Q2 output becomes " High " level.
In switching circuit K22, if the input signal carrying out self-detection circuit K21 becomes " High "
Level, then transistor Q2 switches to connection from disconnection.Owing to switching to connection by transistor Q2,
Thus resistance R2 and resistance R4 is connected in parallel, therefore as the node of dividing potential drop of output voltage Vout
P2 voltage at P2 changes.Thus, shunt regulator SA controls to photoelectrical coupler Pc's
The electric current of light emitting diode Dp flowing makes P2 voltage equal with internal reference voltage, and reflection is arrived
Give the frequency controlling the pulse to transistor Q1 output in the feedback current of control IC111, change
Output voltage Vout.AC transducer 3 performs Isobarically Control by shunt regulator SA and makes electricity
Press to Vout2 '.Taking this as an opportunity, and dropping voltage characteristic switches to " Off from " ヘ word " dropping characteristic
Word " dropping characteristic.
Under voltage after drop characteristic switching, i.e. the current value of load current Iout is between I2 to I3,
AC transducer 3 is according to " Off word " dropping characteristic, and (the 2nd voltage declines spy in the decline of suppression voltage
Property) so that voltage Vout ' is not less than Ve '.As it is shown on figure 3, the 2nd dropping voltage characteristic is with
1 dropping voltage characteristic is compared milder gradient and is declined.
So, by the increase with load current Iout, the dropping voltage characteristic of AC transducer 3
Switch to " Off word " dropping characteristic such that it is able to perform the Isobarically Control of output voltage Vout, make
Obtain the magnitude of voltage that voltage Vout ' keeps higher than Ve '.Therefore, though thermal printer 4 line heat
In the case of in quick 42, the variation of the load current Iout of flowing is relatively big, it is also possible to suitably to heat
Quick printer 4 provides electric power, it is possible to prevent low-voltage mistake or the shutdown of thermal printer 4.
If here, load electric increases further, the current value of load current Iout reaches I2, then
AC transducer 3 according to switching after " Off word " dropping characteristic, make load current Iout reduce and
Output voltage Vout is made to decline (the 3rd dropping voltage characteristic).Thus, overcurrent protection is carried out.
So, connected by transistor Q2, thus the dropping voltage characteristic of AC transducer 3 is from " ヘ
Word " dropping characteristic switches to " Off word " dropping characteristic.By this switching, even if thus at load electricity
In the case of stream Iout has exceeded the current value of normal print range, it is also possible to reliably performed electricity
Stream protection.
Then, the AC conversion in the case of printing the printed data of height printing dutycycle is described
The action of device 3.In the present embodiment, in the printing of the printed data of height printing dutycycle, super
The load current Iout crossing the I1 at the voltage drop point O1 shown in Fig. 3 flows to load.
Fig. 4 is the AC transducer 3 in the case of the printed data to height printing dutycycle prints
Sequential chart.Fig. 4 (A) is the sequential chart of output voltage Vout, and Fig. 4 (B) is load current
The sequential chart of Iout.In figure, Vout1 is the output voltage Vout in the case of transistor Q2 disconnects
Value, Vout2 is the value of output voltage Vout in the case of transistor Q2 connects.
If thermal printer 4 starts the printing of the printed data of high printing dutycycle at moment t1, then from
The load current Iout that AC transducer 3 heat sensitive printer 4 flows bigger.In moment t1 flowing
The value of load current Iout is more than the I1 at the voltage drop point O1 shown in Fig. 3.
Increasing with at moment t1 load current Iout, AC transducer 3 declines spy according to " ヘ word "
Property and make output voltage Vout decline.At moment t2, dropping voltage characteristic is declined from " ヘ word "
Characteristic switches to " Off word " dropping characteristic.Thus, the electricity of the output voltage Vout of AC transducer 3
Pressure value remains Vout2 after moment t2.
As it has been described above, AC transducer 3 is after switching to " Off word " dropping characteristic, according to " Off
Word " dropping characteristic, output voltage Vout is controlled so that output voltage Vout is not less than
Ve.The threshold value of output voltage Vout of low-voltage mistake is become here, Ve is thermal printer 4.
Therefore, even if the load current Iout flowing to thermal printer 4 increases, it is also possible to prevent AC from changing
Device 3 be supplied to the output voltage Vout of thermal printer 4 the low-voltage mistake caused by decline,
Shut down.
If additionally, the printing at moment t3 thermal printer 4 terminates, then flowing to thermal printer 4
Load current Iout reduce.In AC transducer 3, with the minimizing of load current Iout, brilliant
Body pipe Q2 disconnects, and changes as the P2 voltage at the node P2 of the dividing potential drop of output voltage Vout.
The electric current controlling to flow to the light emitting diode Dp of photoelectrical coupler Pc is so that P2 voltage is with internal
Reference voltage equal, and reflect give control IC111 feedback current in control transistor
The frequency of the pulse of Q1 output, changes output voltage Vout.Shunt regulator SA is with this dividing potential drop
Change, make the output voltage Vout of AC transducer 3 return to Vout1 from Vout2, and export
Vout1。
So, AC transducer 3 is by switching dropping voltage characteristic, though thus thermal printer 4
Load increase also be able to suitably provide electric power.Therefore, even height prints the printing number of dutycycle
According to, thermal printer 4 also is able to suitably print.Additionally, thermal printer 4 will not occur AC
Low-voltage mistake caused by the decline of the service voltage of transducer 3, shutdown, it is possible to stably carry out
Printing.Additionally, along with the printing of thermal printer 4 terminates, load current Iout reduces, and AC turns
The output voltage Vout of parallel operation 3 is automatically reverted to Vout1, therefore the electric power to thermal printer 4
Supply can keep stable state.
As described above, the AC transducer 3 (supply unit) involved by present embodiment
It is supplied to load by DC current based on alternating current.AC transducer 3 possesses power circuit, this electricity
Source circuit has the voltage of multiple output voltage relative to the load current being supplied to load and declines spy
Property.Power circuit is in the case of the current value of load current becomes specific state, under switching voltage
Drop characteristic.
Thus, even if AC transducer 3 is in the case of the variation of load is relatively big, it is also possible to suitably
Electric power is provided.
Additionally, the power circuit of AC transducer 3 has represents that the increase with load current exports
" ヘ word " dropping characteristic (the 1st dropping voltage characteristic) of the characteristic that voltage declines and by ratio (the
1 dropping voltage characteristic) characteristic (the 2nd dropping voltage characteristic) of milder gradient and represent companion
With the decline of load current, (the 3rd dropping voltage characteristic) of the characteristic that output voltage declines is constituted
" Off word " dropping characteristic.
Thus, AC transducer 3 is by switching to dropping voltage characteristic from " ヘ word " dropping characteristic
" Off word " dropping characteristic such that it is able to electric power is suitably provided, and overcurrent protection can be carried out.
Additionally, the power circuit of AC transducer 3 possesses the feelings that load current becomes specific state
Condition carries out the testing circuit K21 (test section) that detects and testing result based on testing circuit K21
Switch switching circuit K22 (switching part) of dropping voltage characteristic.
Thus, even if in the case of the variation of load current is relatively big, it is also possible to by detection load electricity
Flow and switch dropping voltage characteristic, carrying out the supply of suitable electric power.
Additionally, in the power circuit of AC transducer 3, testing circuit K21 is at the electricity of load current
In the case of flow valuve becomes specific current value, the output of change detection result, switching circuit K22 root
According to the output of testing circuit K21, switch dropping voltage characteristic.
As it has been described above, in the case of the current value of load current Iout is I2, switching voltage declines
Characteristic.By switching, thus carry out Isobarically Control so that exporting Vout2.This Vout2 is set as
The value high for Ve of the magnitude of voltage being used for low-voltage mistake.Thus, by switching under voltage at I2
Drop characteristic, even if thus AC transducer 3 load current Iout increase, it is also possible to suitably provide electricity
Power so that be not result in the shutdown of low-voltage mistake even power supply.
Additionally, the power circuit of AC transducer 3 is on-off mode.Power circuit possesses and comprises switch
The primary side circuit 3A of circuit K11 and couple with primary side circuit 3A DC current is provided
Give secondary side circuit 3B of load.In secondary side circuit 3B, possesses reference voltage circuit, to two
The output voltage Vout of secondary lateral circuit 3B carries out the bleeder circuit of dividing potential drop, the dividing potential drop electricity to bleeder circuit
The shunt regulator SA pressing the reference voltage with internal reference voltage circuit to compare (compares electric
Road) and the comparative result of shunt regulator SA is fed back to the photoelectrical coupler of on-off circuit K11
Pc (feedback circuit).Switching circuit K22 of AC transducer 3 constitutes bleeder circuit by changing
The combination of resistance makes dividing potential drop change, thus the switching frequency changing power supply declines to switch voltage
Characteristic.
Thus, by making reference voltage change such that it is able to by dropping voltage characteristic from " ヘ word "
Dropping characteristic switches to " Off word " dropping characteristic, it is possible to carry out the supply of suitable electric power.
Additionally, AC transducer 3 is covered power circuit by framework and constitutes.
Thereby, it is possible to make the electricity that " ヘ word " dropping characteristic and " Off word " dropping characteristic are switched over
Source circuit is adapted to AC transducer 3.
2nd embodiment
Fig. 5 is to represent the thermal printer 4A applied involved by the 2nd embodiment of the present utility model
The figure of composition.
Thermal printer 4A is as thermal printer 4 illustrated in above-mentioned 1st embodiment
Ground, possess have the line thermal head 42 of heater element 41, print head drive division 43, carry electronic
Machine 44, power supply unit 45 and the printer in control portion 46.
Built-in and illustrated in the 1st embodiment AC transducer 3 of thermal printer 4A is suitable
Power circuit 30.Power circuit 30, in the same manner as AC transducer 3, possesses primary side circuit 3A
And secondary side circuit 3B, secondary side circuit 3B the DC current generated is exported power supply unit 45.
The output voltage Vout exported to power supply unit 45 from secondary side circuit 3B and load current Iout
In the same manner as the output voltage Vout and load current Iout of explanation in above-mentioned 1st embodiment
Change.
Thermal printer 4A is directly connected to commercial ac power source 2, in thermal printer 4A
Portion, the primary side circuit 3A of power circuit 30 is connected with commercial ac power source 2.
The thermal printer 4A of the 2nd embodiment be by with thermal printer 4 (Fig. 1) external connection
AC transducer 3 (Fig. 1) be built in the composition of printer.In this composition, with the above-mentioned 1st
Embodiment similarly, even if in the case of load in line thermal head 42 increases, it is also possible to
Prevent from causing voltage as low-voltage mistake to decline.Therefore, thermal printer 4A can be with institute
The printing dutycycle of the content of printing the most stably performs printing action.
It addition, the respective embodiments described above are the most only to represent a mode of the present utility model, in this practicality
Can at random carry out deforming and applying in novel scope.Such as, will in the 1st embodiment
Supply unit is illustrated as AC transducer 3, but is not limited to this, as long as make output voltage Vout
The supply unit of the type of change, it is also possible to be the supply unit of other modes.Additionally, the most also may be used
To be the device being connected and providing electric power with multiple printers.Additionally, thermal printer 4,4A also may be used
To be connected with not shown main frame, based on the data inputted from this main frame, print image or word.
In this case, the composition involved by connection of the composition of main frame, thermal printer 4,4A and main frame
It is arbitrary.
Additionally, such as, in the present embodiment, the load example of electric power will be provided by AC transducer 3
It is shown as thermal printer 4, but this utility model is not limited to this.Such as, thermal printer 4 is also
It can be other the printer such as ink-jet printer possessing the line head fixing when printing.Additionally,
Load is not limited to printer, it is also possible to be electronic equipment or the motor with other functions, as long as
It is to provide the device of electric power just can apply this utility model from AC transducer 3.And then, Fig. 1 with
And the circuit shown in Fig. 5 constitutes an only example, it is possible to carry out the component of diagram with equal number
Or the IC of varying number carries out the composition change of displacement etc., can in the range of this utility model
At random carry out changing this be do not house doubtful.
Claims (9)
1. a supply unit, it is characterised in that
Described supply unit is the printer that DC current is supplied to load based on alternating current
Supply unit,
Described supply unit possesses power circuit, and described power circuit has at least 3 relative to offer
To the dropping voltage characteristic of the output voltage of the load current of described load,
Described power circuit, in the case of the current value of described load current becomes specific state, is cut
Change described dropping voltage characteristic.
Supply unit the most according to claim 1, it is characterised in that
Described power circuit has the 1st dropping voltage characteristic, the 2nd dropping voltage characteristic and the 3rd voltage
Dropping characteristic, described 1st dropping voltage characteristic represents the described output of increase with described load current
The characteristic that voltage declines, described 2nd dropping voltage characteristic represents the increase institute with described load current
State the characteristic that output voltage declines, institute with the gradient milder than described 1st dropping voltage characteristic
State the 3rd dropping voltage characteristic and represent the spy declining the decline of described output voltage with described load current
Property.
Supply unit the most according to claim 2, it is characterised in that
Described power circuit switches from described 1st dropping voltage characteristic with the increase of described load current
For described 2nd dropping voltage characteristic, and switch to described 3rd electricity with the decline of described load current
Drops characteristic.
Supply unit the most according to claim 1, it is characterised in that
Described power circuit possesses:
Test section, its situation that described load current becomes described specific state detects；With
Switching part, its testing result based on described test section, switch described dropping voltage characteristic.
Supply unit the most according to claim 4, it is characterised in that
Described test section is cut in the case of the current value of described load current becomes specific current value
Change output,
Described switching part, according to the output of described test section, switches described dropping voltage characteristic.
Supply unit the most according to claim 4, it is characterised in that
Described power circuit is the on-off mode comprising on-off circuit, and described switching part is at described load electricity
In the case of the current value of stream becomes specific current value, occurred by the frequency making described on-off circuit
Change switches described dropping voltage characteristic.
Supply unit the most according to claim 6, it is characterised in that
Described power circuit has:
Primary side circuit, it comprises described on-off circuit；With
Secondary side circuit, it couples with described primary side circuit, is supplied to by described DC current described
Load,
In described secondary side circuit side, possess:
Reference voltage circuit；
Bleeder circuit, it carries out dividing potential drop to the described output voltage of described secondary side circuit；
Comparison circuit, branch pressure voltage and the reference voltage of described bleeder circuit are compared by it；With
Feedback circuit, its comparative result based on described comparison circuit makes the frequency of described on-off circuit
Change,
Described switching part switches described electricity by making the branch pressure voltage of described bleeder circuit change
Drops characteristic.
Supply unit the most according to claim 1, it is characterised in that
Described supply unit is the AC transducer type that described power circuit is covered by framework.
9. a printer, it is characterised in that possess:
Print head, it has multiple prints fixing on the direction intersected with the conveying direction of printed medium
Brush element；With
Power circuit, its based on alternating current to described print head provide DC current,
Described power circuit has at least 3 relative to load current defeated being supplied to described print head
Go out the dropping voltage characteristic of voltage, and become the feelings of specific state at the current value of described load current
Under condition, switch described dropping voltage characteristic.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015008356A JP6455170B2 (en) | 2015-01-20 | 2015-01-20 | Power supply device and printer |
| JP2015-008356 | 2015-01-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205489774U true CN205489774U (en) | 2016-08-17 |
Family
ID=56464641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620016965.4U Expired - Fee Related CN205489774U (en) | 2015-01-20 | 2016-01-08 | Power supply unit and printer |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6455170B2 (en) |
| CN (1) | CN205489774U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109968817A (en) * | 2017-12-28 | 2019-07-05 | 精工爱普生株式会社 | Piezoelectric print head and piezoelectric ink jet printer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6751527B2 (en) * | 2016-09-26 | 2020-09-09 | 東芝ライテック株式会社 | Lighting system and power supply |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06169566A (en) * | 1992-11-30 | 1994-06-14 | Murata Mfg Co Ltd | Switching power supply device |
| JP3549772B2 (en) * | 1999-05-21 | 2004-08-04 | シャープ株式会社 | Stabilized power supply |
| JP3500631B2 (en) * | 2002-03-29 | 2004-02-23 | サンケン電気株式会社 | Switching power supply |
-
2015
- 2015-01-20 JP JP2015008356A patent/JP6455170B2/en not_active Expired - Fee Related
-
2016
- 2016-01-08 CN CN201620016965.4U patent/CN205489774U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109968817A (en) * | 2017-12-28 | 2019-07-05 | 精工爱普生株式会社 | Piezoelectric print head and piezoelectric ink jet printer |
| CN109968817B (en) * | 2017-12-28 | 2020-10-30 | 精工爱普生株式会社 | Piezoelectric print head and piezoelectric ink jet printer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6455170B2 (en) | 2019-01-23 |
| JP2016135001A (en) | 2016-07-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 |