CN202721657U - Power control circuit - Google Patents
Power control circuit Download PDFInfo
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- CN202721657U CN202721657U CN2012203392345U CN201220339234U CN202721657U CN 202721657 U CN202721657 U CN 202721657U CN 2012203392345 U CN2012203392345 U CN 2012203392345U CN 201220339234 U CN201220339234 U CN 201220339234U CN 202721657 U CN202721657 U CN 202721657U
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Abstract
The utility model discloses a power control circuit, which is a power circuit connected to a device. The power control circuit comprises a switching element, a control module, an optical coupling module, an energy forbidding module and a power supply module, wherein the control module is connected with the switching element and an input power supply; a first end of the optical coupling module is connected with the control module, and the control module drives the optical coupling module according to an enabling signal of the switching element; a first end of the energy forbidding module is connected with the control module, and a second end of the energy forbidding module is connected with the first end of the optical coupling module and switches off the optical coupling module according to the energy forbidding signal of the switching element; and the power supply module is connected with the input power supply and the power circuit of the device, and correspondingly connects or cuts off an electrical connection path between the input power supply and the power circuit according to the on-off state of the optical coupling module. The power control circuit disclosed by the utility model can avoid possible sparks at a contact of a traditional mechanical switch, and prevents defects that electronic components are damaged because of large current produced when the device is powered on or sparks are produced when the power contacts contact.
Description
Technical field
The utility model relates to a kind of power control circuit, refers to especially a kind of power control circuit that is applied to power circuit in the control appliance.
Background technology
Printer is a kind of office equipment commonly used, and it mainly comprises dot matrix printer, ink-jet printer, laser printer and label machine etc.Printer also is a kind of office equipment of easy fault simultaneously, except general common exterior mechanical fault of prining (for example: sheet feed shaft damages), still the fault that has the internal circuit damage to cause, and internal circuit is damaged most reason and is on the market employed printer, all directly adopts with mechanical switch as power switch element.
The mechanical switch of tradition causes the fault except easily oxidation own, again because of its Starting mode for electric energy directly is provided, internal circuit moment is started energy larger, and often cause electronic component to damage because transient energy is excessive or produce the problem such as spark during the power supply contact contact.
Therefore, relevant printer manufacturer is invariably attempted to find out a kind of mode or is provided a kind of control circuit to improve present problem.
Summary of the invention
The purpose of this utility model is to provide a kind of power control circuit of using semiconductor element, give up tradition directly in the mode of mechanical switch as power turn-on, improve the generation of instantaneous large-current and cause the problem of the damage of equipment component, and the durability degree that uses of increase equipment.
According to the disclosed embodiment of the utility model, power control circuit is connected in a power circuit of an equipment, and it comprises a switch element, a control module, an optical coupler module, a forbidden energy module (di sablemodu l e) and a supply module; This control module connects this switch element and an input power.One first end of this optical coupler module connects this control module, and this control module drives this optical coupler module according to an activation signal of this switch element; One first end of this forbidden energy module connects this control module, and one second end of this forbidden energy module connects this first end of this optical coupler module, and closes this optical coupler module according to a forbidden energy signal of this switch element; This supply module is connected in this power circuit of this input power and this equipment, and according to the corresponding conducting of open and-shut mode of this optical coupler module or the electrical ties path of ending this input power and power circuit.
The power control circuit that the utility model proposes, wherein, this equipment can be a printer, and this power circuit is the power circuit of general printer.
The power control circuit that the utility model proposes, wherein, this control module comprises at least:
One the first transistor;
One input resistance, an end of this input resistance connects this switch element;
One first divider resistance, a first end of this first divider resistance connect between this input power and this supply module, and one second end of this first divider resistance R1 connects a first end of this first transistor;
One second divider resistance, a first end of this second divider resistance connects this first end of this first divider resistance, and one second end of this second divider resistance connects the other end of this input resistance and one second end of this first transistor;
One postpones resistance, and an end of this delay resistance connects one the 3rd end of this first transistor, and the other end is ground connection then;
One postpones electric capacity, and an end of this delay electric capacity connects the 3rd end of this delay resistance and this first transistor; And
One drives diode, and an end of this driving diode connects this delay resistance and this delay electric capacity, and the other end then connects this optical coupler module.
The power control circuit that the utility model proposes, wherein, this driving diode is a Zener diode, this first transistor is a PNP transistor.
The power control circuit that the utility model proposes, wherein, this supply module comprises at least:
One transistor seconds, a first end of this transistor seconds connects this power circuit of this equipment;
One the 3rd divider resistance, an end of the 3rd divider resistance connect one second end of this transistor seconds, and the other end connects this optical coupler module;
One the 4th divider resistance, an end of the 4th divider resistance connect one second end of this transistor seconds, and the other end connects one the 3rd end and the 3rd divider resistance of this transistor seconds; And
One charging capacitor is connected between this second end and the 3rd end of this transistor seconds, and in parallel with the 4th divider resistance.
The power control circuit that the utility model proposes, wherein, this forbidden energy module comprises at least:
One forbidden energy resistance, an end of this forbidden energy resistance connect the 3rd end and this delay resistance of this first transistor;
One forbidden energy electric capacity, an end of this forbidden energy electric capacity connects the other end of this forbidden energy resistance, other end ground connection;
One first disables transistor;
One second disables transistor with this first disables transistor, is connected to the end that this forbidden energy electric capacity differs from ground connection jointly; And
One the 3rd disables transistor changes with this second disables transistor string, and jointly is connected between this driving diode and this optical coupler module.
The power control circuit that the utility model proposes, wherein, this first disables transistor, this second disables transistor and the 3rd disables transistor respectively are a kind of NPN transistor.
The power control circuit that the utility model proposes, wherein, this forbidden energy module comprises at least:
One forbidden energy resistance, an end of this forbidden energy resistance connect the 3rd end and this delay resistance of this first transistor;
One forbidden energy electric capacity, an end of this forbidden energy electric capacity connects the other end of this forbidden energy resistance, other end ground connection;
One first disables transistor;
One second disables transistor with this first disables transistor, is connected to the end that this forbidden energy electric capacity differs from ground connection jointly; And
One the 3rd disables transistor changes with this second disables transistor string, and jointly is connected between this driving diode and this optical coupler module.
The power control circuit that the utility model proposes, wherein, this first disables transistor, this second disables transistor and the 3rd disables transistor respectively are a kind of NPN transistor.
Therefore, according to above-mentioned disclosed structure, the beneficial effect of the utility model power control circuit is, start by the control optical coupler, the indirect path between turn-on power and the device power supply (DPS) circuit again, can avoid accordingly the possibility of traditional mechanical open coila spark, and utilize the characteristic of electronic component turn on delay, the situation that has large electric current to generate when avoiding starting shooting occurs.
Description of drawings
Fig. 1 is the calcspar of an embodiment of the utility model power control circuit.
Fig. 2 is the circuit diagram of an embodiment of the utility model power control circuit.
Fig. 3 is the utility model power control circuit, the partial circuit figure of an embodiment of its switch element conducting state.
Fig. 4 is the utility model power control circuit, and the partial circuit figure of an embodiment in the electrical ties path of input power and power circuit has been set up in its transistor seconds conducting.
Fig. 5 is the utility model power control circuit, and its input resistance and this second divider resistance produce the partial circuit figure of an embodiment of dividing potential drop.
Fig. 6 is the utility model power control circuit, the partial circuit figure of an embodiment of its forbidden energy capacitor charging conducting the 3rd disables transistor.
Description of reference numerals: 10-control module; The 20-optical coupler module; 30-forbidden energy module; The 40-supply module; The 50-input power; 7-equipment; The 70-power circuit; The SW-switch element; R1-the first divider resistance; R2-the second divider resistance; R3-the 3rd divider resistance; R4-the 4th divider resistance; The R5-input resistance; R6-forbidden energy resistance; R7-postpones resistance; C1-postpones electric capacity; The C2-charging capacitor; C3-forbidden energy electric capacity; D1-drives diode; The Q1-the first transistor; The Q2-transistor seconds; Q3-the first disables transistor; Q4-the second disables transistor; Q5-the 3rd disables transistor
Embodiment
Below only describe the utility model in detail with embodiment.
At first, please refer to Figure 1 and Figure 2, Fig. 1 is the calcspar of an embodiment of the utility model power control circuit, and Fig. 2 is the circuit diagram of an embodiment of the utility model power control circuit, wherein Fig. 2 omits the power circuit of equipment among Fig. 1, and the VPP representative connects the node of this power circuit.In the present embodiment, power control circuit is connected in a power circuit 70 of an equipment 7, and it comprises a switch element SW, a control module 10, an optical coupler module 20, a forbidden energy module (disable module) 30 and one supply module 40.Wherein, this equipment 7 can be a printer, and this power circuit 70 is the power circuit of general existing printer.
This control module 10 connects this switch element SW and an input power 50.One first end of this optical coupler module 20 connects this control module 10, and this control module 10 drives this optical coupler module 20 according to the activation signal of this switch element SW.One first end of this forbidden energy module 30 connects this control module 10, and one second end of this forbidden energy module 30 connects this first end of this optical coupler module 20, and closes this optical coupler module 20 according to the forbidden energy signal of this switch element SW.This supply module 40 is connected in this power circuit 70 of this input power 50 and this equipment 7, and according to the corresponding conducting of open and-shut mode of this optical coupler module 20 or the electrical ties path of ending this input power 50 and power circuit 70.
Secondly, refer again to shown in Figure 2ly, this control module 10 comprises that at least an input resistance R5, a first transistor Q1, one first divider resistance R1, one second divider resistance R2, one postpone resistance R7, and postpone electric capacity C1 and a driving diode D1.The end of this input resistance R5 connects this switch element SW.The first end of this first divider resistance R1 connects between this input power 50 and this supply module 70, and one second end of this first divider resistance R1 connects the first end of this first transistor Q1.The first end of this second divider resistance R2 connects this first end of this first divider resistance R1, and one second end of this second divider resistance R2 connects the other end of this input resistance R5 and one second end of this first transistor Q1.The end of this delay resistance R7 connects one the 3rd end of this first transistor Q1, and the other end is ground connection then.The end of this delay electric capacity C1 connects the 3rd end of this delay resistance R7 and this first transistor Q1.The end of this driving diode D1 connects this delay resistance R7 and this delay electric capacity C1, and the other end then connects this optical coupler module 20.Wherein, in the present embodiment, this driving diode D1 is a Zener diode, and this first transistor Q1 is a PNP transistor, and its first end is emitter, and the second end is base stage, and the 3rd end is collector electrode.Yet the common skill personage that has in this case field knows, this first transistor Q1 is replaceable to be the transistor of other connection of equivalent type.
This supply module 40 comprises a transistor seconds Q2, one the 3rd divider resistance R3, one the 4th divider resistance R4 and a charging capacitor C2 at least.The first end of this transistor seconds Q2 connects this power circuit 70 of this equipment 7.The end of the 3rd divider resistance R3 connects one second end of this transistor seconds Q2, and the other end connects this optical coupler module 20.The end of the 4th divider resistance R4 connects one second end of this transistor seconds Q2, and the other end connects one the 3rd end and the 3rd divider resistance R3 of this transistor seconds Q2.This charging capacitor C2 is connected between the second end and the 3rd end of this transistor seconds Q2, and in parallel with the 4th divider resistance R4.
When this optical coupler module 20 not yet before the conducting, this supply module 40 is just as open circuit, and this transistor seconds Q2 no-bias and make power circuit 70 no-voltages that are connected in the other end makes this equipment 7 be in off-mode.
Below please arrange in pairs or groups referring to figs. 1 to 4, by the clipped element as signal disconnected, open circuit, with the electrical ties path of convenient this input power 50 of explanation the utility model power control circuit conducting with power circuit 70.
Such as Fig. 2 and shown in Figure 3, at first, when the user pressed (conducting) this switch element SW for the first time, this control module 10 formed a conducting loop with this input power 50, so that the first divider resistance R1 and the second divider resistance R2 produce dividing potential drop, and allow the first transistor Q1 conducting.After the first transistor Q1 conducting, form a delay voltage in this delay resistance R7 with postponing electric capacity C1, this delay voltage produces a drive current by this driving diode D1, in order to drive this optical coupler module 20.Therefore, when the user pressed (conducting) this switch element SW for the first time, its conducting loop order drove the start that diode D1 produces drive current, is defined as the enable signal of above-mentioned switch element SW in this.
Such as Fig. 2 and shown in Figure 4, after this control module 10 drives this optical coupler module 20, the 3rd divider resistance R3 that connects this optical coupler module 20 in the other end, and the 4th divider resistance R4 that connects this input power 50, both divider resistance R3, R4 has produced dividing potential drop, allows transistor seconds Q2 have bias voltage and conducting, has set up the electrical ties path of this input power 50 with power circuit 70.
Yet, in the process of conducting, because the factor of this charging capacitor C2 charging, so that the 4th divider resistance R4 voltage presents rising, also allow transistor seconds Q2 conduction impedance reduce, by this, the situation of instantaneous large-current in the process of electric power starting, can not occur.In addition, the 4th divider resistance R4 voltage continues to rise, until the system voltage of this power circuit 70 is identical with these input power 50 voltages.Behind the system voltage of obtaining power circuit 70, this optical coupler module 20 can change by this power circuit 70 provides required operating voltage, just can keep integral device in open state, in other words, this switch element SW can be a little signal switch, and power control circuit of the present utility model only needs pressing of moment to allow the first transistor Q1 conducting of this control module 10 get final product.
Next, please refer to Fig. 2, Fig. 5 and Fig. 6, the signal by the conduct of clipped element is broken, opened a way ends the electrical ties path of this input power 50 and power circuit 70 with convenient the utility model power control circuit that illustrates.
This forbidden energy module 30 comprises a forbidden energy resistance R 6, a forbidden energy capacitor C 3, one first disables transistor Q3, one second disables transistor Q4 and one the 3rd disables transistor Q5 at least.One end of this forbidden energy resistance R 6 connects the 3rd end and this delay resistance R7 of this first transistor Q1, and the other end of this forbidden energy resistance R 6 then connects an end of this forbidden energy capacitor C 3, and the other end of this forbidden energy capacitor C 3 is ground connection then.This first disables transistor Q3 and this second disables transistor Q4 form a current mirror, jointly are connected to the end that this forbidden energy capacitor C 3 differs from ground connection.This second disables transistor Q4 string is (cascode) the 3rd disables transistor Q5 repeatedly, and and this second disables transistor Q4 jointly be connected between this driving diode D1 and this optical coupler module 20.
In an embodiment, the first disables transistor Q3, the second disables transistor Q4 and the 3rd disables transistor Q5 respectively are a kind of NPN transistor, yet the common skill personage that has in this case field knows, those disables transistor can be the transistor of other types by equivalent replacement.
Such as Fig. 5 and shown in Figure 6, when switch element SW under equipment 70 open states again during conducting, this input resistance R5 of this control circuit 10 and this second divider resistance R2 produce dividing potential drop, so that should postpone the voltage drop of resistance R7, and allow this delay electric capacity C1 begin 3 chargings of this forbidden energy capacitor C, (that is in the current mirror common joint current potential) is higher than repeatedly (ca s code) the 3rd disables transistor Q5 of this second disables transistor Q4 string until the current potential of forbidden energy capacitor C 3 charging voltages, allow the second disables transistor Q4 and the 3rd disables transistor Q5 conducting, and then close optical coupler module 20.
After optical coupler module 20 was closed, the transistor seconds Q2 of supply module 40 became from conducting and opens circuit, and allowed power circuit 70 no-voltages and reached the effect of shutdown.Therefore, under start dress state, when the user pressed (conducting) this switch element SW again, its conducting loop began 3 chargings of this forbidden energy capacitor C until the start of conducting the 3rd disables transistor Q5 is defined as the forbidden energy signal of above-mentioned switch element SW in this.
It should be noted that this forbidden energy signal corresponding by forbidden energy resistance to the 3 charging behaviors of forbidden energy capacitor C, certainly will need to the lasting compressing time through a RC time constant after, can conducting this this second disables transistor Q4 and the 3rd disables transistor Q5; That compares opening device only needs the moment compressing time, when the user wants closing device, needs long pressing, and then can not be left in the basket to the lasting compressing time of this RC time constant therebetween, that is to say, this design can reduce the possibility of switch element SW false touch.
In sum, the utility model power control circuit is by the start (being optical coupler module 20) of control optical coupler, the indirect path between turn-on power and the device power supply (DPS) circuit again, can avoid accordingly the possibility of traditional mechanical open coila spark, and utilize the characteristic of electronic component turn on delay (RC electronic circuit), the situation that has large electric current to generate when avoiding starting shooting occurs.
In addition, it should be noted that, in above-described embodiment, learn, this power circuit 70 of this equipment 7 can be the power circuit of an existing printer, the letter speech, the utility model is only controlled the part of front end input power, therefore have the high-compatibility with the device power supply (DPS) circuit, and when powered-down, identical with the circuit of existing application machine formula switch, do not have the generation of extra power consumption all fully.
The above only is preferred embodiment of the present utility model, when can not be in order to limiting the enforceable scope of the utility model, all those of ordinary skill of being familiar with this case field variation and the modification that obviously can do, all should be considered as not departing from flesh and blood of the present utility model.
Claims (9)
1. a power control circuit is characterized in that, comprising:
One switch element;
One control module connects this switch element and an input power;
One optical coupler module, a first end of this optical coupler module connects this control module, and wherein, this control module drives this optical coupler module according to an activation signal of this switch element;
One forbidden energy module comprises a first end and one second end, and this first end connects this control module, and this second end connects this first end of this optical coupler module, and closes this optical coupler module according to a forbidden energy signal of this switch element; And
One supply module is connected in this power circuit of this input power and this equipment, and according to the corresponding conducting of open and-shut mode of this optical coupler module or the electrical ties path of ending this input power and this power circuit.
2. power control circuit as claimed in claim 1 is characterized in that, this equipment is a printer.
3. power control circuit as claimed in claim 1 is characterized in that, this control module comprises at least:
One the first transistor;
One input resistance, an end of this input resistance connects this switch element;
One first divider resistance, a first end of this first divider resistance connect between this input power and this supply module, and one second end of this first divider resistance R1 connects a first end of this first transistor;
One second divider resistance, a first end of this second divider resistance connects this first end of this first divider resistance, and one second end of this second divider resistance connects the other end of this input resistance and one second end of this first transistor;
One postpones resistance, and an end of this delay resistance connects one the 3rd end of this first transistor, and the other end is ground connection then;
One postpones electric capacity, and an end of this delay electric capacity connects the 3rd end of this delay resistance and this first transistor; And
One drives diode, and an end of this driving diode connects this delay resistance and this delay electric capacity, and the other end then connects this optical coupler module.
4. power control circuit as claimed in claim 3 is characterized in that, this driving diode is a Zener diode, and this first transistor is a PNP transistor.
5. such as claim 1,3 or 4 described power control circuits, it is characterized in that, this supply module comprises at least:
One transistor seconds, a first end of this transistor seconds connects this power circuit of this equipment;
One the 3rd divider resistance, an end of the 3rd divider resistance connect one second end of this transistor seconds, and the other end connects this optical coupler module;
One the 4th divider resistance, an end of the 4th divider resistance connect one second end of this transistor seconds, and the other end connects one the 3rd end and the 3rd divider resistance of this transistor seconds; And
One charging capacitor is connected between this second end and the 3rd end of this transistor seconds, and in parallel with the 4th divider resistance.
6. such as claim 1,3 or 4 described power control circuits, it is characterized in that, this forbidden energy module comprises at least:
One forbidden energy resistance, an end of this forbidden energy resistance connect the 3rd end and this delay resistance of this first transistor;
One forbidden energy electric capacity, an end of this forbidden energy electric capacity connects the other end of this forbidden energy resistance, other end ground connection;
One first disables transistor;
One second disables transistor with this first disables transistor, is connected to the end that this forbidden energy electric capacity differs from ground connection jointly; And
One the 3rd disables transistor changes with this second disables transistor string, and jointly is connected between this driving diode and this optical coupler module.
7. power control circuit as claimed in claim 6 is characterized in that, this first disables transistor, this second disables transistor and the 3rd disables transistor respectively are a kind of NPN transistor.
8. power control circuit as claimed in claim 5 is characterized in that, this forbidden energy module comprises at least:
One forbidden energy resistance, an end of this forbidden energy resistance connect the 3rd end and this delay resistance of this first transistor;
One forbidden energy electric capacity, an end of this forbidden energy electric capacity connects the other end of this forbidden energy resistance, other end ground connection;
One first disables transistor;
One second disables transistor with this first disables transistor, is connected to the end that this forbidden energy electric capacity differs from ground connection jointly; And
One the 3rd disables transistor changes with this second disables transistor string, and jointly is connected between this driving diode and this optical coupler module.
9. power control circuit as claimed in claim 8 is characterized in that, this first disables transistor, this second disables transistor and the 3rd disables transistor respectively are a kind of NPN transistor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN2012203392345U CN202721657U (en) | 2012-07-12 | 2012-07-12 | Power control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN2012203392345U CN202721657U (en) | 2012-07-12 | 2012-07-12 | Power control circuit |
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CN202721657U true CN202721657U (en) | 2013-02-06 |
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CN2012203392345U Expired - Fee Related CN202721657U (en) | 2012-07-12 | 2012-07-12 | Power control circuit |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111381524A (en) * | 2018-12-27 | 2020-07-07 | 华硕电脑股份有限公司 | Power supply control circuit |
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2012
- 2012-07-12 CN CN2012203392345U patent/CN202721657U/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111381524A (en) * | 2018-12-27 | 2020-07-07 | 华硕电脑股份有限公司 | Power supply control circuit |
CN111381524B (en) * | 2018-12-27 | 2021-04-02 | 华硕电脑股份有限公司 | Power supply control circuit |
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C14 | Grant of patent or utility model | ||
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CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130206 Termination date: 20190712 |
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CF01 | Termination of patent right due to non-payment of annual fee |