CN206977023U - printer head protection circuit and printer - Google Patents
printer head protection circuit and printer Download PDFInfo
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- CN206977023U CN206977023U CN201720943956.4U CN201720943956U CN206977023U CN 206977023 U CN206977023 U CN 206977023U CN 201720943956 U CN201720943956 U CN 201720943956U CN 206977023 U CN206977023 U CN 206977023U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
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- 230000003111 delayed effect Effects 0.000 claims abstract description 6
- 239000003381 stabilizer Substances 0.000 claims description 22
- 230000005622 photoelectricity Effects 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 4
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Abstract
The utility model discloses a kind of printer head protection circuit and printer; printer head protection circuit includes power module, voltage detection module, switch module and control module; power module includes time-delay conversion unit and voltage conversion unit; time-delay conversion unit is used to first voltage being converted into second voltage and the output that is delayed; voltage conversion unit is used to second voltage being converted into tertiary voltage, thinks that printer head is powered；Voltage detection module is electrically connected with power module and control module, and control module is conveyed to for detecting the voltage of power module, and by testing result；Control module electrically connects with switch module, for outputing control signals to switch module according to testing result；Switch module electrically connects with power module, and whether the control signal control power module for being exported according to control module is printer head power supply.The utility model can increase the service life of printer head.
Description
Technical field
It the utility model is related to printer technology field, more particularly to a kind of printer head protection circuit and printer.
Background technology
Voltage needed for existing printer head is usually 3.3V and 42V, start power up printed when, printing
The voltage that the power supply of machine is conveyed to printer head can rise to corresponding voltage from 0V, i.e. moment is directly from 0V rapid increases
To 3.3V and 42V, it is only necessary to tens us or ns so that the charging complete in a short time of the shower nozzle of printer, thus can be to spray
The use of head is affected, and service life is short.
Utility model content
The present invention is based on above one or more problem, there is provided a kind of printer head protection circuit and printer,
To solve the problems, such as that short time discharge and recharge in the prior art causes the service life of shower nozzle short.
On the one hand, the utility model discloses a kind of printer head protection circuit, it includes：Power module, voltage inspection
Surveying module, switch module and control module, the power module includes time-delay conversion unit and voltage conversion unit, the delay
Converting unit is used to first voltage being converted into second voltage and the output that is delayed, the voltage conversion unit are used for described second
Voltage conversion thinks that printer head is powered into tertiary voltage；The voltage detection module and the power module and the control
Molding block is electrically connected, and the control module is conveyed to for detecting the voltage of the power module, and by testing result；The control
Molding block electrically connects with the switch module, for outputing control signals to the switch module according to the testing result；Institute
State switch module to electrically connect with the power module, the control signal for being exported according to the control module controls the power supply
Whether module is printer head power supply.
Preferably, the switch module includes first switch unit and second switch unit, and the first switch unit is
Optical coupled switch；The first switch unit electrically connects with the control module and the second switch unit, for according to
The control signal of control module output controls the second switch unit to be turned on and off；The second switch unit and the electricity
Source module electrically connects, for controlling whether the power module is printer head power supply.
Preferably, the switch module also includes over-current protecting unit, the over-current protecting unit and the first switch
Unit and second switch unit electrical connection, the over-current protecting unit are used for the electric current flowed through in the second switch unit
During more than preset value, flow control signals were fed back to the first switch unit, so that described in first switch unit closing
Second switch unit.
Preferably, the first switch unit includes first resistor, the first light emitting diode, the first triode and the first light
Electric IGCT, one end of the first resistor electrically connect with the power module, the other end of the first resistor and described the
The anode electrical connection of one light emitting diode, the colelctor electrode of the negative electrode of first light emitting diode and first triode are electrically connected
Connecing, the base stage of first triode is electrically connected to the control module, the grounded emitter of first triode, and described
One photoelectricity IGCT electrically connects with the second switch unit.
Preferably, the second switch unit includes the first FET, second resistance and 3rd resistor, described first
The source electrode of effect pipe is connected with one end of the 3rd resistor, and drain electrode and the power module of first FET are electrically connected
Connect, the grid of first FET electrically connects with the first switch unit, one end of the second resistance and the electricity
Source module electrically connects, and the other end of the second resistance electrically connects with the grid of first FET, the 3rd resistor
The other end be used for electrically connected with the printer head.
Preferably, the second switch unit also includes the first electric capacity, one end of first electric capacity and the power supply mould
Block electrically connects, and the other end of first electric capacity electrically connects with the grid of first FET.
Preferably, the second switch unit also includes the first voltage-regulator diode, one end of first voltage-regulator diode
Electrically connected with the power module, the source electrode of the other end of first voltage-regulator diode and first FET is electrically connected
Connect.
Preferably, the over-current protecting unit include the second triode, the 3rd triode, the 4th resistance, the 5th resistance and
6th resistance, the base stage of second triode electrically connect with one end of the 4th resistance, the current collection of second triode
Pole electrically connects with one end of the 5th resistance, the source electrode electricity of the emitter stage of second triode and first FET
Connection, the other end of the 4th resistance electrically connect with one end of the 3rd resistor, the other end ground connection of the 5th resistance；
The base stage of 3rd triode is connected with one end of the 6th resistance, the colelctor electrode and described first of the 3rd triode
The base stage electrical connection of triode, the grounded emitter of the 3rd triode, the other end and described second of the 6th resistance
The colelctor electrode electrical connection of triode.
Preferably, the time-delay conversion unit includes voltage-releasing voltage stabilizer, the first inductance, the second inductance, the second electric capacity, the 3rd
Electric capacity, the 4th electric capacity, the 5th electric capacity, the 17th resistance and the 18th resistance, one end of first inductance and the decompression are steady
The output pin electrical connection of depressor, the other end of first inductance electrically connect with one end of second electric capacity, and described second
The other end of electric capacity is connected with one end of the 17th resistance, the other end ground connection of the 17th resistance；Second electricity
One end of sense electrically connects with the output pin of the voltage-releasing voltage stabilizer, the other end of second inductance and the 4th electric capacity and
The input electrical connection of the voltage conversion unit, the other end ground connection of the 4th electric capacity, a termination of the 3rd electric capacity
Ground, the other end of the 3rd electric capacity electrically connect with the output pin of the voltage-releasing voltage stabilizer, a termination of the 5th electric capacity
Ground, the other end of the 5th electric capacity electrically connect with the soft start pin of the voltage-releasing voltage stabilizer.
On the other hand, the invention also discloses a kind of printer, its printer head for including described in any of the above-described to protect
Protection circuit.
In summary, power module of the present utility model is by being provided with the time-delay conversion unit and voltage conversion list
Member, the time-delay conversion unit is used to first voltage being converted into second voltage and the output that is delayed, the voltage conversion unit are used
In the second voltage is converted into tertiary voltage, think that printer head is powered.Therefore, start power up printed when
Wait, the voltage that the power supply of printer is conveyed to printer head can slowly rise to corresponding voltage from 0V, so as to increase
The service life of printer head.
Brief description of the drawings
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is the circuit diagram of time-delay conversion unit of the present utility model.
Fig. 3 is the circuit diagram of voltage conversion unit of the present utility model.
Fig. 4 is the circuit diagram of voltage detection module of the present utility model.
Fig. 5 is the circuit diagram of switch module of the present utility model.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.If it should be noted that do not conflicted, this hair
Each feature in bright embodiment and embodiment can be combined with each other, within protection scope of the present invention.
Referring to Fig. 1, the utility model discloses a kind of printer head protection circuit, it includes power module 1, voltage
Detection module 2, switch module 3 and control module 4, the power module 1 include time-delay conversion unit 11 and voltage conversion unit
12.The time-delay conversion unit 11 is used to first voltage being converted into second voltage and the output that is delayed, the voltage conversion unit
12 are used to the second voltage being converted into tertiary voltage, think that printer head is powered.The voltage detection module 2 with it is described
Power module 1 and the control module 4 electrically connect, and for detecting the voltage of the power module 1, and testing result are conveyed to
The control module 4；The control module 4 electrically connects with the switch module 3, for according to the testing result output control
Signal is to the switch module 3；The switch module 3 electrically connects with the power module 1, for according to the control module 4
The control signal of output controls whether the power module 1 is printer head power supply.
Specifically, in the present embodiment, the first voltage is+42 volts, and the second voltage is+5 volts, the 3rd electricity
Press as+3.3 volts.It is understood that the first voltage and the second voltage can be selected as needed, do not do herein
It is specific to limit.
Preferably, referring to Fig. 2, the time-delay conversion unit 11 includes voltage-releasing voltage stabilizer U2, the first inductance L1, the second electricity
Feel L2, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 and the 17th resistance R17, first inductance
L1 one end electrically connects with the output pin of the voltage-releasing voltage stabilizer U2, and the output pin of the voltage-releasing voltage stabilizer U2 draws for OUT
Pin, the other end of the first inductance L1 electrically connect with one end of the second electric capacity C2, the other end of the second electric capacity C2
It is connected with one end of the 17th resistance R17, the other end ground connection of the 17th resistance R17.
One end of the second inductance L2 electrically connects with the output pin of the voltage-releasing voltage stabilizer U2, the second inductance L2
The other end electrically connected with the 4th electric capacity C4 and the voltage conversion unit input, the 4th electric capacity C4's is another
End ground connection.One end ground connection of the 3rd electric capacity C3, the other end of the 3rd electric capacity C3 are defeated with the voltage-releasing voltage stabilizer U2's
Go out pin electrical connection.One end ground connection of the 5th electric capacity C5, the other end and the voltage-releasing voltage stabilizer of the 5th electric capacity C5
U2 soft start pin electrical connection, the soft start pin is the SS pins of the voltage-releasing voltage stabilizer U2.Specifically, in this reality
Apply in example, the model LM5576 of the voltage-releasing voltage stabilizer U2.It is understood that the model of the voltage-releasing voltage stabilizer U2 and
The structure of the time-delay conversion unit is not specifically limited herein.
Preferably, the time-delay conversion unit 11 also includes the 18th resistance R18, the 19th resistance R19, the 20th resistance
R20, the 21st resistance R21, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 and the first diode
D4, the 18th resistance R18 one end and one end of the 19th resistance R19 and one end phase of the 6th electric capacity C6
Even, the other end of the 18th resistance R18 is connected with one end of the 3rd electric capacity C3, and the 19th resistance R19's is another
One end is grounded.The other end of the 6th electric capacity C6 is connected with one end of the 20th resistance R20, the 20th resistance
The R20 other end electrically connects with the COMP pins of the voltage-releasing voltage stabilizer U2.One end ground connection of the 21st resistance R21,
The other end of the 21st resistance R21 electrically connects with the RT pins of the voltage-releasing voltage stabilizer U2.
One end ground connection of the 7th electric capacity C7, the other end of the 7th electric capacity C7 is with the voltage-releasing voltage stabilizer U2's
VCC pin electrically connects.One end of the 8th electric capacity C8 electrically connects with the BST pins of the voltage-releasing voltage stabilizer U2, and the described 8th
The electric capacity C8 other end electrically connects with the PRE pins of the voltage-releasing voltage stabilizer U2, one end ground connection of the 9th electric capacity C9, described
The 9th electric capacity C9 other end electrically connects with the AGND pins of the voltage-releasing voltage stabilizer U2.One end of the first diode D4 with
IS1 pins and IS2 the pins electrical connection of the voltage-releasing voltage stabilizer U2, the other end of the first diode D4 and the described second electricity
Hold C2 electrical connections.
Referring to Fig. 3, the voltage conversion unit 12 includes pressure regulator U3, the 3rd inductance L3, the tenth electric capacity C10, the tenth
One electric capacity C11, the 12nd electric capacity C12, the 22nd resistance R22 and the 23rd resistance R23, the VIN of the pressure regulator U3 draw
Pin electrically connects with the second inductance L2, and one end of the 3rd inductance L3 electrically connects with the OUT pins of the pressure regulator U3, institute
The other end for stating the 3rd inductance L3 is used to electrically connect with the shower nozzle of printer.One end of the tenth electric capacity C10 and the pressure regulation
Device U3 GND pin electrical connection, the other end ground connection of the tenth electric capacity C10.One end of the 11st electric capacity C11 with it is described
Pressure regulator U3 OUT pins electrical connection, the other end ground connection of the 11st electric capacity C11.One end of the 12nd electric capacity C12
Electrically connected with the output end of the 3rd inductance L3, the other end ground connection of the 12nd electric capacity C12.22nd resistance
R22 one end electrically connects with the OUT pins of the pressure regulator U3, the other end and described second of the 22nd resistance R22
13 resistance R23 one end is connected, the other end ground connection of the 23rd resistance R23.In the present embodiment, the pressure regulator
U3 model LM117.In the present embodiment, the voltage conversion unit 12 is used for the voltage by+5 voltage conversion into+3V.
Preferably, as shown in figure 4, the voltage detection module 2 includes partial pressure unit 21, comparing unit 22 and the 4th switchs
Unit 23, the partial pressure unit 21 electrically connect with the power module 1, the comparing unit 22 and the partial pressure unit 21 and institute
State the 4th switch element 23 to electrically connect, the 4th switch of the voltage signal control for being exported according to the partial pressure unit 21 is single
Member 23 is turned on and off.4th switch element 23 electrically connects with the control module 4, for being carried to the control module 4
For switching signal, so that the control module 4 controls the second switch unit 32 to be turned on and off according to the switching signal.
Preferably, the partial pressure unit 21 includes the 9th resistance R9, the tenth resistance R10 and the 11st resistance R11, and described
Nine resistance R9 one end electrically connects with the power module 1, in the present embodiment, one end and the electricity of the 9th resistance R9
Source module 1 electrically connects, to obtain the first voltage, the other end of the 9th resistance R9 and the tenth resistance R10 and the
11 resistance R11 one end electrical connection, the other end ground connection of the tenth resistance R10, the other end of the 11st resistance R11
Electrically connected with the comparing unit 22.
The comparing unit 22 includes comparator U1 and the 12nd resistance R12, the positive input of the comparator U1 with
The 11st resistance R11 is connected, and the reverse input end of the comparator U1 is electrically connected to the power module 1, in this implementation
In example, the reverse input end of the comparator U1 is electrically connected by the 16th resistance R16 with the power module, with described in acquisition
Tertiary voltage.The output end of the comparator U1 electrically connects with the 4th switch element 23, and the one of the 12nd resistance R12
End is connected with the positive input of the comparator U1, and the other end of the 12nd resistance R12 is defeated with the comparator U1's
Go out end to be connected.In the present embodiment, the operational amplifier of the comparator U1 models OPA2348AIDR, it is to be understood that
The model of the comparator U1 is not specifically limited herein.
4th switch element 23 includes the 5th triode Q5, the 13rd resistance R13 and the 14th resistance R14, described
5th triode Q5 base stage electrically connects with one end of the 14th resistance R14, the colelctor electrode of the 5th triode Q5 with
The control module 4 and the 13rd resistance R13 one end electrically connect, the grounded emitter of the 5th triode Q5, institute
The other end for stating the 13rd resistance R13 electrically connects with the power module 1, the other end of the 14th resistance R14 with it is described
Comparator U1 output end electrical connection.
Referring to Fig. 1 and Fig. 5, the switch module 3 includes first switch unit 31 and second switch unit 32, and described
One switch element 31 is optical coupled switch, the first switch unit 31 and the control module 4 and the second switch unit 32
Electrical connection, the control signal for being exported according to the control module 4 control the second switch unit 32 to be turned on and off, institute
State second switch unit 32 to electrically connect with the power module 1, for controlling whether the power module 1 is that printer head supplies
Electricity.
Preferably, the first switch unit 31 includes first resistor R1, the first light emitting diode D1, the first triode Q1
And the first photoelectricity IGCT D2, one end of the first resistor R1 electrically connect with the power module 1, the first resistor R1's
The other end electrically connects with the anode of the first light emitting diode D1, the negative electrode and described first of the first light emitting diode D1
Triode Q1 colelctor electrode electrical connection, the base stage of the first triode Q1 are electrically connected to the control module 4, and the described 1st
Pole pipe Q1 grounded emitter, the first photoelectricity IGCT D2 electrically connect with the second switch unit.In the present embodiment,
One end of the first resistor R1 electrically connects with the power module 1, to obtain the tertiary voltage.
After the first triode Q1 is opened, the power module 1 drives the first light emitting diode D1, is allowed to send one
The light of standing wave length, the first photoelectricity IGCT D2 is triggered with this, so that the first photoelectricity IGCT D2 is opened.Pass through described first
Light emitting diode D1 and the first photoelectricity IGCT D2 cooperation, so as to realize signal isolation, so that the second switch unit 32
Can be circulated high current.Wherein, the first light emitting diode D1 and the first photoelectricity IGCT D2 of the present embodiment are by model PC817
Photoelectrical coupler realize.As long as it is understood that the first switch unit 31 is optical coupled switch, its structure is herein
It is not specifically limited.
The second switch unit 32 includes the first FET P, second resistance R2 and 3rd resistor R3, described first
Effect pipe P source electrode is connected with one end of the 3rd resistor R3, drain electrode and the power module of the first FET P
1 electrical connection, the grid of the first FET P electrically connect with the first switch unit 31.In the present embodiment, described
One FET P drain electrode electrically connects with the power module 1, to obtain the first voltage, the first FET P's
Grid electrically connects with one end of the first photoelectricity IGCT D2 in the first switch unit 31.One end of the second resistance R2 with
The power module 1 electrically connects, and the other end of the second resistance R2 electrically connects with the grid of the first FET P, institute
The other end for stating 3rd resistor R3 is used to electrically connect with the printer head.When the first photoelectricity IGCT D2 is opened,
The first FET P conductings, thus the power module 1 can be that the printer head is powered.
Preferably, the second switch unit 32 also includes the first electric capacity C1, one end of the first electric capacity C1 with it is described
Power module 1 electrically connects, and the other end of the first electric capacity C1 electrically connects with the grid of the first FET P.By setting
The first electric capacity C1 is put, so that when the first photoelectricity IGCT D2 is opened, the first electric capacity C1 slowly discharges, so that
The first FET P is gradually opened, and so as to extend the upper electric time, avoids instantaneous large-current from damaging printer head.
Preferably, the second switch unit 32 also includes the first voltage-regulator diode D3 and current-limiting resistance R15, and described first
Voltage-regulator diode D3 one end electrically connects with the power module 1, the other end of the first voltage-regulator diode D3 and described the
One FET P source electrode electrical connection.One end of the current-limiting resistance R15 and one end of the first photoelectricity IGCT D2 are electrically connected
Connect, the other end ground connection of the current-limiting resistance R15.By setting the first voltage-regulator diode D3, when the voltage of power module 1
Fluctuate, or when other reasons cause each point variation in voltage in circuit, export to the voltage of the printer head and protect substantially
Hold constant.
The switch module 3 also includes over-current protecting unit 33, the over-current protecting unit 33 and the first switch list
Member 31 and the second switch unit 32 electrically connect, and the over-current protecting unit 33 is used to flow through in the second switch unit 32
Electric current when being more than preset value, flow control signals were fed back to the first switch unit 31, so that the first switch unit
31 close the second switch unit 32.By setting the over-current protecting unit 33, preferably to avoid printer head quilt
Damage.Wherein, the preset value can voluntarily be set as needed, be not specifically limited herein.
Preferably, the over-current protecting unit 33 includes the second triode Q2, the 3rd triode Q3, the 4th resistance R4, the
Five resistance R5 and the 6th resistance R6, the base stage of the second triode Q2 electrically connects with one end of the 4th resistance R4, described
Second triode Q2 colelctor electrode electrically connects with one end of the 5th resistance R5, the emitter stage of the second triode Q2 and institute
The first FET P source electrode electrical connection is stated, one end of the other end and the 3rd resistor R3 of the 4th resistance R4 is electrically connected
Connect, the other end ground connection of the 5th resistance R5.The base stage and one end phase of the 6th resistance R6 of the 3rd triode Q3
Even, the colelctor electrode of the 3rd triode Q3 electrically connects with the base stage of the first triode Q1, the 3rd triode Q3's
Grounded emitter, the other end of the 6th resistance R6 electrically connect with the colelctor electrode of the second triode Q2.The overcurrent protection
The structure of unit 33 is simpler, quickly and can realize overcurrent protection.
Preferably, the switch module 3 also includes the 3rd switch element 34, and the 3rd switch element 34 includes the four or three
Pole pipe Q4, the 7th resistance R7 and the 8th resistance R8, the base stage and one end phase of the 8th resistance R8 of the 4th triode Q4
Even, the colelctor electrode of the 4th triode Q4 electrically connects with the base stage of the first triode Q1, the 4th triode Q4's
Grounded emitter, the other end of the 8th resistance R8 electrically connect with the control module 4, one end of the 7th resistance R7 with
The colelctor electrode electrical connection of the 4th triode Q4, the other end of the 7th resistance R7 electrically connect with the power module 1.
In the present embodiment, one end of the 7th resistance R7 electrically connects with the power module 1, to obtain the tertiary voltage.Pass through
The mutual cooperation of the first switch unit 31, over-current protecting unit 33 and the 3rd switch element 34, thus it is short in generation
Protection can be realized when road or excessively stream, and integrated circuit is simple in construction.
The switch module 3 also includes the second light emitting diode D5, the second photoelectricity IGCT D6, the second FET K, the
Two voltage-regulator diode D7, the 24th resistance R24, the 25th resistance R25 and the 26th resistance R26, described second is luminous
Diode D5 one end is connected with the 24th resistance R24, the other end and the control of the second light emitting diode D5
Molding block 4 is connected, the second FET K and the second voltage-regulator diode D7, the 25th resistance R25 and the 26th
Resistance R26 is electrically connected.When printer head is stopped, the control module 4 is by controlling second light emitting diode
D5, to control the second FET K to open, the electric energy at the printer head is discharged, so as to preferably protect
Printer head.
The operation principle of the utility model short-circuit protection is：When occurring short-circuit at the first voltage of the power module 1,
The positive input of the comparator U1 receives low level signal, and the output end of the comparator U1 exports low level signal,
The 5th triode Q5 cut-offs, the control module 4 obtain high level signal from one end of the 13rd resistance R13, from
And control module 4 exports high level signal to the 4th triode Q4, so that the 4th triode Q4 is turned on, described first
Triode Q1 ends, and the first light emitting diode D1 is closed, and the first photoelectricity IGCT D2 is closed, so that described first
Effect pipe P is closed, and stops powering to the printer head so as to realize.Similarly, the electric current mistake at the 3rd resistor R3
When big, the second triode Q2 and the 3rd triode Q3 conductings, so that the first FET P is closed, so as to
Realize and stop powering to the printer head.Its circuit structure is simple, it is high to start fast and reliability.
From foregoing circuit structure, by the rise time or fall time of change+3.3V ,+42V supply voltage, with
Extend the drive waveforms voltage of printer head in the time required for raising and lowering.Raising and lowering is oblique after extending the time
Rate will reduce so that the board of printer and shower nozzle discharge and recharge time are longer, can ensure that discharge and recharge is done down again after completing
One action, the speed of discharge and recharge will be slack-off, causes damage to avoid the charge and discharge Electrical change of board and shower nozzle too fast.
The invention also discloses a kind of printer, and it includes printer head protection circuit described above.Due to this dozen
The printer head protection circuit of print machine is identical with printer head protection circuit structure described above, therefore, it may have on
State described printer head protection circuit possessed technique effect.
In summary, power module 1 of the present utility model is by being provided with the time-delay conversion unit 11 and voltage conversion
Unit 12, the time-delay conversion unit 11 are used to first voltage being converted into second voltage and the output that is delayed, the voltage conversion
Unit 12 is used to the second voltage being converted into tertiary voltage, thinks that printer head is powered.Therefore, progress is being started power up
When printing, the voltage that the power supply of printer is conveyed to printer head can slowly rise to corresponding voltage from 0V, from
And the service life of printer head can be increased.
Claims (10)
- A kind of 1. printer head protection circuit, it is characterised in that including：Power module, voltage detection module, switch module and Control module, the power module include time-delay conversion unit and voltage conversion unit, and the time-delay conversion unit is used for the Into second voltage and the output that is delayed, the voltage conversion unit is used to the second voltage being converted into the 3rd electricity one voltage conversion Pressure, think that printer head is powered；The voltage detection module electrically connects with the power module and the control module, is used for The voltage of the power module is detected, and testing result is conveyed to the control module；The control module and the switch Module electrically connects, for outputing control signals to the switch module according to the testing result；The switch module with it is described Power module electrically connects, and the control signal for being exported according to the control module controls whether the power module is printer Shower nozzle is powered.
- 2. printer head protection circuit according to claim 1, it is characterised in that the switch module is opened including first It is optical coupled switch to close unit and second switch unit, the first switch unit；The first switch unit and the control mould Block and second switch unit electrical connection, the control signal for being exported according to the control module control the second switch Unit is turned on and off；The second switch unit electrically connects with the power module, for whether controlling the power module Powered for printer head.
- 3. printer head protection circuit according to claim 2, it is characterised in that the switch module also includes excessively stream Protection location, the over-current protecting unit electrically connect with the first switch unit and the second switch unit, the excessively stream Protection location is used for when the electric current that the second switch unit flows through is more than preset value, feeds back flow control signals to described the One switch element, so that the first switch unit closes the second switch unit.
- 4. printer head protection circuit according to claim 3, it is characterised in that the first switch unit includes the One resistance, the first light emitting diode, the first triode and the first photoelectricity IGCT, one end of the first resistor and the power supply Module electrically connects, and the other end of the first resistor electrically connects with the anode of first light emitting diode, and described first is luminous The negative electrode of diode electrically connects with the colelctor electrode of first triode, and the base stage of first triode is electrically connected to the control Molding block, the grounded emitter of first triode, the first photoelectricity IGCT electrically connect with the second switch unit.
- 5. printer head protection circuit according to claim 4, it is characterised in that the second switch unit includes the One FET, second resistance and 3rd resistor, the source electrode of first FET are connected with one end of the 3rd resistor, The drain electrode of first FET is electrically connected with the power module, and the grid of first FET is opened with described first Unit electrical connection is closed, one end of the second resistance electrically connects with the power module, the other end of the second resistance and institute The grid electrical connection of the first FET is stated, the other end of the 3rd resistor is used to electrically connect with the printer head.
- 6. printer head protection circuit according to claim 5, it is characterised in that the second switch unit also includes First electric capacity, one end of first electric capacity electrically connect with the power module, the other end of first electric capacity and described the The grid electrical connection of one FET.
- 7. printer head protection circuit according to claim 5, it is characterised in that the second switch unit also includes First voltage-regulator diode, one end of first voltage-regulator diode electrically connect with the power module, the pole of the first voltage stabilizing two The other end of pipe electrically connects with the source electrode of first FET.
- 8. printer head protection circuit according to claim 5, it is characterised in that the over-current protecting unit includes the Two triodes, the 3rd triode, the 4th resistance, the 5th resistance and the 6th resistance, the base stage of second triode and described the One end electrical connection of four resistance, the colelctor electrode of second triode electrically connect with one end of the 5th resistance, and described second The emitter stage of triode electrically connects with the source electrode of first FET, the other end of the 4th resistance and the described 3rd electricity One end electrical connection of resistance, the other end ground connection of the 5th resistance；The base stage of 3rd triode and the 6th resistance One end is connected, and the colelctor electrode of the 3rd triode electrically connects with the base stage of first triode, the 3rd triode Grounded emitter, the other end of the 6th resistance electrically connect with the colelctor electrode of second triode.
- 9. printer head protection circuit according to claim 1, it is characterised in that the time-delay conversion unit includes drop Press voltage-stablizer, the first inductance, the second inductance, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 17th resistance and the 18 resistance, one end of first inductance electrically connect with the output pin of the voltage-releasing voltage stabilizer, first inductance it is another One end electrically connects with one end of second electric capacity, one end phase of the other end of second electric capacity and the 17th resistance Even, the other end ground connection of the 17th resistance；One end of second inductance and the output pin electricity of the voltage-releasing voltage stabilizer Connection, the other end of second inductance electrically connects with the input of the 4th electric capacity and the voltage conversion unit, described The other end ground connection of 4th electric capacity, one end ground connection of the 3rd electric capacity, the other end of the 3rd electric capacity and the decompression are steady The output pin electrical connection of depressor, one end ground connection of the 5th electric capacity, the other end of the 5th electric capacity and the decompression are steady The soft start pin electrical connection of depressor.
- 10. a kind of printer, it is characterised in that including the printer head protection circuit described in claim any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720943956.4U CN206977023U (en) | 2017-07-31 | 2017-07-31 | printer head protection circuit and printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720943956.4U CN206977023U (en) | 2017-07-31 | 2017-07-31 | printer head protection circuit and printer |
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| Publication Number | Publication Date |
|---|---|
| CN206977023U true CN206977023U (en) | 2018-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720943956.4U Active CN206977023U (en) | 2017-07-31 | 2017-07-31 | printer head protection circuit and printer |
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| Country | Link |
|---|---|
| CN (1) | CN206977023U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782668A (en) * | 2019-01-27 | 2019-05-21 | 惠州三华工业有限公司 | To the control circuit and short circuit protection system of needle type print head conduction time |
-
2017
- 2017-07-31 CN CN201720943956.4U patent/CN206977023U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782668A (en) * | 2019-01-27 | 2019-05-21 | 惠州三华工业有限公司 | To the control circuit and short circuit protection system of needle type print head conduction time |
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Address after: 518000 a201-a301, building a, Sino German European Industrial Demonstration Park, Hangcheng Avenue, guxing community, Xixiang street, Bao'an District, Shenzhen, Guangdong Patentee after: Shenzhen Hansen Software Co.,Ltd. Address before: 518000 1703, Building C6, Hengfeng Industrial City, Xixiang Street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN HOSONSOFT Co.,Ltd. |
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