CN102147560B - Projector and cooling method thereof - Google Patents
Projector and cooling method thereof Download PDFInfo
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- CN102147560B CN102147560B CN201110091241.8A CN201110091241A CN102147560B CN 102147560 B CN102147560 B CN 102147560B CN 201110091241 A CN201110091241 A CN 201110091241A CN 102147560 B CN102147560 B CN 102147560B
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- power supply
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Abstract
The invention provides a projector and a cooling method thereof. The projector comprises a projector body, an energy storing unit, a fan, a working clock generator and a fan power circuit. The energy storing unit is used for storing backup power and the fan is used for cooling the projector body. The working clock generator generates a working clock and the fan power circuit is coupled to the energy storing unit. When a main power supply is removed, the fan power circuit generates a power signal to enable a fan according to the working clock and the backup power. The power signal makes changes periodically between a first level and a second level. Through the invention, when a user directly removes a power plug of the projector without following the normal process of powering off the projector, the projector body is cooled to prolong the service life of the projector, in addition, the operating time of the fan can be improved without increasing the capacity of the energy storing unit, and thus the production cost is effectively reduced and the marketability is improved as well.
Description
Technical field
The invention relates to a kind of projector, and particularly relevant for a kind of fan projector and cooling means thereof of working time of improving.
Background technology
Along with the application of projector is more and more extensive, projector, except being used in the meeting report of general office, is also often used in various seminars or academic curriculum.Projector utilizes fan that outer gas stream is blown into projector body, the heat being produced with cooling thermal source (as illuminator).
Normal, projector still must maintain the running of fan after shutdown, after fan is cooling by the remaining temperature of projector body, then pulls out the power lead of projector.If user, by above-mentioned steps normal shutdown, does not easily cause shorten the serviceable life of projector.
In order to prevent above-mentioned undesired shutdown action, in conventional practice Hui projector, use jumbo energy-storage units, energy-storage units is for example electric capacity.When user is not during normal shutdown, energy-storage units still can provide fan required electric power with cooling projector body.
Yet, if the off-capacity of energy-storage units will cause the fan running time too short, and cooling projector body effectively.If use jumbo energy-storage units the raising of production cost will to be caused again, and reduce the market competitiveness.
Summary of the invention
The present invention, relevant for a kind of projector and cooling means thereof, can effectively improve the fan running time under the capacity that does not improve energy-storage units.
According to the present invention, a kind of projector is proposed.Projector comprises projector body, energy-storage units, fan, work clock generator and fan power supply circuit.The energy-storage units electric power that stores for future use, and fan cooled projector body.Work clock generator produces work clock.Fan power supply circuit couples energy-storage units.When pulling out primary power, fan power supply circuit produces power supply signal activation fan according to work clock and standby power.Power supply signal periodically changes between first standard and second standard.
According to projector of the present invention, also comprise detecting unit, couple this primary power, when pulling out this primary power, this detecting unit notifies this fan power supply circuit to produce this power supply signal to this fan.
According to projector of the present invention, this fan power supply circuit comprises direct-current power supply converting circuit, is controlled by this work clock, to produce this power supply signal.Further, this work clock generator comprises transistor and charging and discharging circuit.This transistorized first end is exported this work clock to this direct-current power supply converting circuit.Charging and discharging circuit couples this transistorized control end and this transistorized the second end.Further, this charging and discharging circuit comprises the first resistance, the second resistance, electric capacity and the 3rd resistance.One end of this first resistance couples this transistorized control end, and the other end of this first resistance couples this transistorized the second end.One end of this second resistance couples this transistorized control end.One end of this electric capacity couples the other end of this second resistance, and the other end of this electric capacity couples this transistorized the second end.One end of the 3rd resistance couples the other end of this second resistance, and the other end of the 3rd resistance receives this power supply signal.
According to projector of the present invention, this fan power supply circuit comprises direct-current power supply converting circuit and power switch.Power switch couples this direct-current power supply converting circuit, and is controlled by this work clock, to export this power supply signal.Further, this work clock generator comprises phase inverter and charging and discharging circuit.Phase inverter is exported this work clock and is controlled this power switch.Charging and discharging circuit is coupled to the input end of this phase inverter and the output terminal of this phase inverter.Further, this charging and discharging circuit comprises electric capacity and resistance.Electric capacity is coupled to the input end of this phase inverter.One end of this resistance is coupled to the input end of this phase inverter, and the other end of this resistance is coupled to the output terminal of this phase inverter.
According to the present invention, a kind of cooling means of projector is proposed.Projector comprises projector body, fan, fan power supply circuit, work clock generator and energy-storage units.Cooling means comprises: the electric power that stores for future use is to energy-storage units; Produce work clock; And when pulling out primary power, fan power supply circuit produces power supply signal activation fan with cooling projector body according to work clock and standby power, power supply signal periodically changes between first standard and second standard.
According to cooling means of the present invention, also comprise: detect this primary power and whether pull out; And when pulling out this primary power, notify this fan power supply circuit to produce this power supply signal to this fan.
Further, this fan power supply circuit comprises direct-current power supply converting circuit, is controlled by this work clock, to produce this power supply signal; This work clock generator comprises transistor and this charging and discharging circuit, and this transistorized first end is exported this work clock to this direct-current power supply converting circuit, and this charging and discharging circuit couples this transistorized control end and this transistorized the second end.Or further, this fan power supply circuit comprises direct-current power supply converting circuit and power switch, and this power switch couples this direct-current power supply converting circuit, and is controlled by this work clock, to produce this power supply signal; This work clock generator comprises phase inverter and charging and discharging circuit, and this phase inverter is exported this work clock and controlled this power switch, and this charging and discharging circuit is coupled to the input end of this phase inverter and the output terminal of this phase inverter.
Compared with prior art, projector of the present invention and cooling means thereof, can in user not normal shutdown be that footpath row is while pulling out the attaching plug of projector, projector body is carried out cooling to increase the serviceable life of projector, and can under the capacity that does not improve energy-storage units, can improve the duration of runs of fan, effectively reduce production costs and improve the market competitiveness.
Accompanying drawing explanation
Fig. 1 is the schematic diagram according to projector of the present invention.
Fig. 2 is the process flow diagram according to the cooling means of the projector of the embodiment of the present invention.
Fig. 3 is the schematic diagram according to the projector of first embodiment of the invention.
Fig. 4 A is the oscillogram according to the power supply signal of first embodiment of the invention.
Fig. 4 B is the oscillogram according to the power supply signal of second embodiment of the invention.
Fig. 5 is the schematic diagram according to the projector of second embodiment of the invention.
Embodiment
For making that object of the present invention, structure, feature and function thereof are had to further understanding, hereby coordinate embodiment to be described in detail as follows.
In order to improve the fan running time, following embodiment provides a kind of projector and cooling means thereof.Projector comprises projector body, energy-storage units, fan, work clock generator and fan power supply circuit.The energy-storage units electric power that stores for future use, and fan cooled projector body.Work clock generator produces work clock.Fan power supply circuit couples energy-storage units.When pulling out primary power, fan power supply circuit produces power supply signal activation fan according to work clock and standby power.Power supply signal periodically changes between first standard and second standard.
The cooling means of projector comprises; Store for future use electric power to energy-storage units; Produce work clock; And when pulling out primary power, fan power supply circuit produces power supply signal activation fan with cooling projector body according to work clock and standby power, power supply signal periodically changes between first standard and second standard.
Referring to Fig. 1 and Fig. 2, Fig. 1 is the schematic diagram according to projector of the present invention, and Fig. 2 is the process flow diagram according to the cooling means of the projector of the embodiment of the present invention.Projector 1 comprises projector body 11, energy-storage units 12, fan 13, work clock generator 14 and fan power supply circuit 15.Energy-storage units 12 is for example battery, and energy-storage units 12 is in order to the electric power that stores for future use.Fan 13 is in order to cooling projector body 11, and work clock generator 14 produces work clock CLK.Fan power supply circuit 15 couples energy-storage units 12.
For prevent user not normal shutdown be the attaching plug that footpath row is pulled out projector, fan power supply circuit 15 can be that footpath row produces power supply signal POFF activation fan 13 with cooling projector body 11 while pulling out the attaching plug of projector in normal shutdown not.Furthermore, when pulling out primary power, fan power supply circuit 15 produces power supply signal POFF activation fan 13 according to work clock CLK and standby power P12V.Power supply signal POFF periodically changes between first standard and second standard.It should be noted that, the aforementioned primary power of pulling out for example refers to, from socket, the attaching plug of projector 1 is pulled out to primary power.
First the cooling means of projector 1 comprises the steps: that, as shown in step 21, the electric power P12V that stores for future use is to energy-storage units 12.Then as shown in step 22, work clock generator 14 produces work clock CLK.And then as shown in step 23, when pulling out primary power, fan power supply circuit 15 produces power supply signal POFF activation fan 13 with cooling projector body 11 according to work clock CLK and standby power P12V, and power supply signal POFF periodically changes between first standard and second standard.
Referring to Fig. 3 and Fig. 4 A, Fig. 3 is the schematic diagram according to the projector of first embodiment of the invention, and Fig. 4 A is the oscillogram according to the power supply signal of first embodiment of the invention.1 Yu Tu3Yi projector 3 of aforementioned projector is example explanation, and projector 3 more comprises circuit for detecting 161 and pulse width modulation circuit 17.And with work clock generator 141 and fan power supply circuit 151, represent respectively in aforementioned work clock generator 14 and fan power supply circuit 15Yu projector 3.When normal work, fan 13 is by 17 power supplies of pulse width modulation circuit.On the contrary, when user not normal shutdown be that footpath row supplies power to fan 13 by fan power supply circuit 15 while pulling out the attaching plug of projector.
Detecting unit 161 couples primary power P12V-IN, and when pulling out primary power P12V-IN, detecting unit 161 notice fan power supply circuit 151 produce power supply signal POFF1 to fan 13.Circuit for detecting 161 comprises that transistor Q1 and resistance R 1 are to R3.The control end of transistor Q1 couples primary power P12V-IN through resistance R 1.Fan power supply circuit 151 comprises direct-current power supply converting circuit 1511, and direct-current power supply converting circuit 1511 is controlled by work clock CLK to produce power supply signal POFF1 activation fan 13.Direct-current power supply converting circuit 1511 comprises direct supply converter ic U17, resistance R 4～R6, capacitor C 1～C4, inductance L 1 and diode D1.The standby power P12V that direct supply converter ic U17 reception energy-storage units 12 provides also couples resistance R 4～R6, capacitor C 1～C2, capacitor C 4, inductance L 1 and diode D1, and capacitor C 3 couples resistance R 6 and inductance L 1 after direct supply converter ic U17 is enabled, direct supply converter ic U17 is according to voltage after standby power P12V output conversion.Inductance L 1, capacitor C 3 and diode D1 are according to Voltage-output power supply signal POFF1 after conversion.
After pulling out primary power P12V-IN, the control end of transistor Q1 is low level, makes transistor Q1 cut-off.Now, standby power P12V is activation (Enable) direct supply converter ic U17 after resistance R 2 and resistance R 3 dividing potential drops, makes power supply signal POFF1 be promoted to gradually 2.8V.Direct-current power supply converting circuit 1511 produces power supply signal POFF1 to fan 13.Power supply signal POFF1 charges until the stored voltage of capacitor C 140 is enough to turn-on transistor Q2 to capacitor C 140.
After transistor Q2 conducting, direct supply converter ic U17 is by decapacitation (Disable), and direct supply converter ic U17 stops the rear voltage of output conversion, so power supply signal POFF1 stops output.Because power supply signal POFF1 stops output, capacitor C 140 is through resistance R 8 and R9 discharges until transistor Q2 cut-off.After transistor Q2 cut-off, direct supply converter ic U17 can be enabled again, makes direct-current power supply converting circuit 1511 regenerate power supply signal POFF1 to fan 13.Hence one can see that, and power supply signal POFF1 periodically changes between first accurate V1 and the accurate V2 of second, to extend the duration of runs of fan 13.
It should be noted that, if the fan that wish starts in remaining static needs larger starting current.Above-mentioned projector preferably in fan be about to static before, again provide power supply signal to fan to reduce power consumption.Thus, not needing to increase the duration of runs that can improve fan under the capacity of energy-storage units, effectively reduce production costs and improve the market competitiveness.
Referring to Fig. 5 and Fig. 4 B, Fig. 5 is the schematic diagram according to the projector of second embodiment of the invention, and Fig. 4 B is the oscillogram according to the power supply signal of second embodiment of the invention.1 Yu Tu5Yi projector 5 of aforementioned projector is example explanation.Projector 5 is mainly that with aforementioned projector 3 main difference parts work clock generator 141, fan power supply circuit 151 and circuit for detecting 161 change respectively with work clock generator 142, fan power supply circuit 152 and circuit for detecting 162 expressions.
Detecting unit 162 couples primary power P12V-IN, and when pulling out primary power P12V-IN, detecting unit 162 notice fan power supply circuit 152 produce power supply signal POFF2 to fan 13.Circuit for detecting 161 comprises transistor Q1 and resistance R 1, resistance R 2 and R3.The control end of transistor Q1 couples primary power P12V-IN through resistance R 1.Fan power supply circuit 152 comprises direct-current power supply converting circuit 1512 and power switch Q3.Power switch Q3 couples direct-current power supply converting circuit 1512, and is controlled by work clock CLK with out-put supply signal POFF.
Direct-current power supply converting circuit 1512 comprises direct supply converter ic U2, resistance R 5～R6, capacitor C 3, capacitor C 5 and inductance L 1.The standby power P12V that direct supply converter ic U2 reception energy-storage units 12 provides also couples resistance R 5～R6, capacitor C 3, capacitor C 5 and inductance L 1.
Work clock generator 142 comprises phase inverter U1 and charging and discharging circuit 1412.Phase inverter U1 output services clock CLK controls power switch Q3.Charging and discharging circuit 1412 is coupled to the input end of phase inverter U1 and the output terminal of phase inverter U1.Charging and discharging circuit 1412 comprises capacitor C 6 and resistance R 11.Capacitor C 6 is coupled to the input end of phase inverter U1.One end of resistance R 11 is coupled to the input end of phase inverter U1, and the other end of resistance R 11 is coupled to the output terminal of phase inverter U1.
After pulling out primary power P12V-IN, the control end of transistor Q1 is low level, makes transistor Q1 cut-off.Direct-current power supply converting circuit 1511 produces power supply signal POFF2.Phase inverter U1 output terminal be high levels make power switch Q3 conducting with out-put supply signal POFF2 to fan 13.When phase inverter U1 output terminal is high levels, through 6 chargings of 11 pairs of capacitor C of resistance R.When the charging voltage of capacitor C 6 arrives a high levels, phase inverter U1 output terminal is changed into as low level.After phase inverter U1 output terminal is changed into as low level, power switch Q3 ends to suspend out-put supply signal POFF2 to fan 13.Capacitor C 6 starts electric discharge until the input end of phase inverter U1 is changed into low level through resistance R 11.When the input end of phase inverter U1 is changed into after low level, the output terminal of phase inverter U1 change into high levels make power switch Q3 conducting with out-put supply signal POFF2 again to fan 13.Hence one can see that, and power supply signal POFF2 periodically changes between first accurate V1 and the accurate V2 of second, to extend the duration of runs of fan 13.
Projector and cooling means thereof that above-described embodiment discloses, can in user not normal shutdown be footpath row while pulling out the attaching plug of projector, projector body is carried out cooling to increase the serviceable life of projector.In addition, projector and cooling means thereof that above-described embodiment discloses can improve the duration of runs of fan under the capacity that does not improve energy-storage units, effectively reduce production costs and improve the market competitiveness.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment having disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (8)
1.Yi Zhong projector, comprising:
Projector body;
Energy-storage units, in order to the electric power that stores for future use;
Fan, in order to cooling this projector body; It is characterized in that this projector also comprises:
Work clock generator, produces work clock; And
Fan power supply circuit, couples this energy-storage units, and when pulling out primary power, this fan power supply circuit produces this fan of power supply signal activation according to this work clock and this standby power, and this power supply signal periodically changes between first standard and second standard;
Wherein, this fan power supply circuit comprises direct-current power supply converting circuit, is controlled by this work clock, to produce this power supply signal; This work clock generator comprises transistor and charging and discharging circuit, this transistorized first end is exported this work clock to this direct-current power supply converting circuit, this charging and discharging circuit couples this transistorized control end and this transistorized the second end, after this transistor turns, this direct-current power supply converting circuit by decapacitation so that this power supply signal stop output, after this transistor cut-off, this direct-current power supply converting circuit can be enabled to produce this power supply signal again.
2. projector as claimed in claim 1, characterized by further comprising: detecting unit, couple this primary power, and when pulling out this primary power, this detecting unit notifies this fan power supply circuit to produce this power supply signal to this fan.
3. projector as claimed in claim 1, is characterized in that this charging and discharging circuit comprises:
The first resistance, one end of this first resistance couples this transistorized control end, and the other end of this first resistance couples this transistorized the second end;
The second resistance, one end of this second resistance couples this transistorized control end;
Electric capacity, one end of this electric capacity couples the other end of this second resistance, and the other end of this electric capacity couples this transistorized the second end; And
The 3rd resistance, one end of the 3rd resistance couples the other end of this second resistance, and the other end of the 3rd resistance receives this power supply signal.
4.Yi Zhong projector, comprising:
Projector body;
Energy-storage units, in order to the electric power that stores for future use;
Fan, in order to cooling this projector body; It is characterized in that this projector also comprises:
Work clock generator, produces work clock; And
Fan power supply circuit, couples this energy-storage units, and when pulling out primary power, this fan power supply circuit produces this fan of power supply signal activation according to this work clock and this standby power, and this power supply signal periodically changes between first standard and second standard;
Wherein, this fan power supply circuit comprises direct-current power supply converting circuit and power switch, and this power switch couples this direct-current power supply converting circuit, and is controlled by this work clock, to export this power supply signal; This work clock generator comprises phase inverter and charging and discharging circuit, this phase inverter is exported this work clock and is controlled this power switch, this charging and discharging circuit is coupled to the input end of this phase inverter and the output terminal of this phase inverter, after the output terminal of this phase inverter is low level, this power switch ends to suspend this power supply signal of output, when the output terminal of this phase inverter is changed into after high levels, this power switch conducting is again to export this power supply signal.
5. projector as claimed in claim 4, characterized by further comprising: detecting unit, couple this primary power, and when pulling out this primary power, this detecting unit notifies this fan power supply circuit to produce this power supply signal to this fan.
6. projector as claimed in claim 4, is characterized in that this charging and discharging circuit comprises:
Electric capacity, is coupled to the input end of this phase inverter; And
Resistance, one end of this resistance is coupled to the input end of this phase inverter, and the other end of this resistance is coupled to the output terminal of this phase inverter.
The cooling means of 7.Yi Zhong projector, this projector comprises projector body, fan, fan power supply circuit, work clock generator and energy-storage units, it is characterized in that this cooling means comprises:
Store for future use electric power to this energy-storage units;
Produce work clock; And
When pulling out primary power, this fan power supply circuit produces this fan of power supply signal activation with cooling this projector body according to this work clock and this standby power, and this power supply signal periodically changes between first standard and second standard;
Wherein, this fan power supply circuit comprises direct-current power supply converting circuit, is controlled by this work clock, to produce this power supply signal; This work clock generator comprises transistor and charging and discharging circuit, this transistorized first end is exported this work clock to this direct-current power supply converting circuit, this charging and discharging circuit couples this transistorized control end and this transistorized the second end, after this transistor turns, this direct-current power supply converting circuit by decapacitation so that this power supply signal stop output, after this transistor cut-off, this direct-current power supply converting circuit can be enabled to produce this power supply signal again;
Or this fan power supply circuit comprises direct-current power supply converting circuit and power switch, this power switch couples this direct-current power supply converting circuit, and is controlled by this work clock, to export this power supply signal; This work clock generator comprises phase inverter and charging and discharging circuit, this phase inverter is exported this work clock and is controlled this power switch, this charging and discharging circuit is coupled to the input end of this phase inverter and the output terminal of this phase inverter, after the output terminal of this phase inverter is low level, this power switch ends to suspend this power supply signal of output, when the output terminal of this phase inverter is changed into after high levels, this power switch conducting is again to export this power supply signal.
8. cooling means as claimed in claim 7, is characterized in that more comprising:
Whether detect this primary power pulls out; And
When pulling out this primary power, notify this fan power supply circuit to produce this power supply signal to this fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110091241.8A CN102147560B (en) | 2011-04-12 | 2011-04-12 | Projector and cooling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110091241.8A CN102147560B (en) | 2011-04-12 | 2011-04-12 | Projector and cooling method thereof |
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| CN102147560A CN102147560A (en) | 2011-08-10 |
| CN102147560B true CN102147560B (en) | 2014-04-02 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW594370B (en) * | 2003-04-02 | 2004-06-21 | Delta Electronics Inc | The radiator of the overhead projector and its operation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201054068Y (en) * | 2007-05-17 | 2008-04-30 | 四川长虹电器股份有限公司 | Projector radiation device |
| JP5369410B2 (en) * | 2007-09-05 | 2013-12-18 | セイコーエプソン株式会社 | Electric motor drive circuit and device equipped with the same |
| JP5515777B2 (en) * | 2009-03-05 | 2014-06-11 | セイコーエプソン株式会社 | Energy conversion device and electromechanical device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW594370B (en) * | 2003-04-02 | 2004-06-21 | Delta Electronics Inc | The radiator of the overhead projector and its operation method |
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