CN103324115B - Discharge circuit and apply the projector of this discharge circuit - Google Patents
Discharge circuit and apply the projector of this discharge circuit Download PDFInfo
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- CN103324115B CN103324115B CN201310180103.6A CN201310180103A CN103324115B CN 103324115 B CN103324115 B CN 103324115B CN 201310180103 A CN201310180103 A CN 201310180103A CN 103324115 B CN103324115 B CN 103324115B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a kind of discharge circuit, this discharge circuit is applied to projector, this projector comprises the power supply unit with circuit of power factor correction, this power supply unit provides power supply for this projector, this circuit of power factor correction has capacity cell, this discharge circuit is electrically connected at this power supply unit, the control circuit that this discharge circuit comprises on-off circuit and is electrically connected with this on-off circuit, this on-off circuit is for controlling the electric discharge of this power supply unit, this control circuit is for controlling cut-off and the conducting of this on-off circuit, this control circuit is electrically connected at this power supply unit and this circuit of power factor correction simultaneously, wherein, when described projector is in running order, this power supply unit starts, and to the capacity cell charging in this circuit of power factor correction, this on-off circuit ends, when described projector is in holding state, this on-off circuit conducting, the capacity cell in this circuit of power factor correction is by this discharge circuit release electric charge.
Description
Technical field
The present invention relates to a kind of discharge circuit, particularly relate to a kind of discharge circuit being applied to projector.
Background technology
Current projector complete machine stand-by power consumption (standbypowerconsumption) needs to be less than 0.5W, to meet the specification of Environment protection and safety.But DLP(DigitalLightalProcession) the internal signal converter of projector can be held concurrently Systematical control usually.The stand-by power consumption of this adhesive integrated circuit is comparatively large, cannot reach complete machine and be less than 0.5W.
Current practice is in projector, add a simple micro-control unit (MCU, MicroControlUnit) Opportunity awaiting control for linear is done, this small control module need have infrared control (IR), Universal Asynchronous Receive/transmission (UART, UniversalAsynchronousReceiver/Transmitter), the function such as Keyboard Control (Keypadcontrol), also need to record the basic setting value of projector and data, to provide user by Universal Asynchronous Receive/dispensing device inquiry.The plug-in EEPROM (Electrically Erasable Programmable Read Only Memo) (EEPROM, ElectricallyErasableProgrammableRead-OnlyMemory) that projector's setting value all deposits in digital light processing unit is inner.
Simultaneously, inner power factor correction (the PFC of projector's power panel (powerboard), powerfactorcorrection) circuit, starting power factor correcting circuit can to the capacitor charging of circuit of power factor correction, the electric charge that during closedown, electric capacity stores need consume light, just can receive power supply from external power cord cable (powercordcable) again.It is voltage 3.3 volts that current power panel generally comprises power supply P3P3V(supply voltage) and power supply P12V(supply voltage be voltage 12 volts), wherein, power supply P3P3V independently controls, power supply P12V and Power Factor Correction Control interlock.Power-on P12V, namely needs starting power factor correcting circuit and charges to the bulky capacitor in circuit of power factor correction.Because digital light processing unit uses P12V power supply, so after projector being powered on, power panel need provide P12V power supply to digital light processing unit, after data are passed to microprocessing unit by digital light processing unit again, other all internal units of microprocessing unit switch enter 0.5W standby mode.But after microprocessing unit closes all internal units, now cannot measure the stand-by power consumption of 0.5W from external power cord cable.Because the electric charge of storage is not yet finished by the electric capacity of circuit of power factor correction, simultaneously because micro-control unit electricity consumption is few, so charge consumption speed is slow.Usual needs 2 to 3 minutes, just can use up the storage electric charge in circuit of power factor correction.Thus when measuring actual stand-by power consumption from power line cables, need wait 2 to 3 minutes, thus slack-off because detecting stand-by power consumption, reduce plant produced speed.
Summary of the invention
In order to overcome the problems referred to above, the invention provides a kind of discharge circuit, the release storing electric charge in projector's power supply unit can be accelerated, be convenient to the measurement of projector's stand-by power consumption.
The invention provides a kind of discharge circuit, it is applied to projector, this projector comprises the power supply unit with circuit of power factor correction, this power supply unit provides multiple power supply for this projector, this circuit of power factor correction has capacity cell, this discharge circuit is electrically connected at this power supply unit, the control circuit that this discharge circuit comprises on-off circuit and is electrically connected with this on-off circuit, this on-off circuit is for controlling capacity cell electric discharge in this circuit of power factor correction, this control circuit is for controlling cut-off and the conducting of this on-off circuit, this control circuit is electrically connected at this power supply unit and this circuit of power factor correction simultaneously.Wherein, when described projector is in running order, this power supply unit starts, and to the capacity cell charging in this circuit of power factor correction, this on-off circuit ends; When described projector is in holding state, this on-off circuit conducting, the capacity cell in this circuit of power factor correction is by this discharge circuit release electric charge.
Preferably, in described discharge circuit, this on-off circuit comprises P-channel enhancement type field effect transistor and triode.
Preferably, in described discharge circuit, the drain electrode of this P-channel enhancement type field effect transistor is by the first resistance eutral grounding, and the grid of this P-channel enhancement type field effect transistor is connected to the collector of this triode, and the source electrode of this P-channel enhancement type field effect transistor is connected to this power supply unit.
Preferably, in described discharge circuit, the collector of this triode is connected to this power supply unit by the second resistance, and the base stage of this triode is connected to this control circuit, the grounded emitter of this triode.
Preferably, in described discharge circuit, this on-off circuit comprises N channel enhancement field effect transistor.
Preferably, in described discharge circuit, the source electrode of this N channel enhancement field effect transistor is by the first resistance eutral grounding, and the grid of this N channel enhancement field effect transistor is connected to control circuit, and the drain electrode of this N channel enhancement field effect transistor is connected to this power supply unit.
Preferably, in described discharge circuit, this control circuit comprises AND circuit.
Preferably, in described discharge circuit, the input end of this AND circuit is electrically connected at this power supply unit and this circuit of power factor correction respectively.
Preferably, in described discharge circuit, this AND circuit is connected to this circuit of power factor correction by not circuit.
Present invention also offers a kind of projector, it comprises the power supply unit with circuit of power factor correction, this power supply unit provides power supply for this projector, this circuit of power factor correction has capacity cell, this projector system also comprises discharge circuit, and this discharge circuit is discharge circuit described in above-mentioned any.
Present invention also offers the measuring method of a kind of projector stand-by power consumption, this projector has power supply unit, this projector also has discharge circuit, the control circuit that this discharge circuit comprises on-off circuit and is electrically connected with this on-off circuit, the method comprises: step one, when this projector is in holding state, described control circuit detects the electric signal in this projector, and it is closed to control this on-off circuit, this discharge circuit starts, and described power supply unit stores electric charge by the release of this discharge circuit; Step 2, by the power line cables of this projector, measures the stand-by power consumption of this projector.
Compared with prior art, the present invention adds a discharge circuit in projector, and this discharge circuit comprises on-off circuit and control circuit, and when described projector is in running order, this on-off circuit ends, and this discharge circuit does not work; When described projector is in holding state, this on-off circuit conducting, this discharge circuit starts, capacity cell in this circuit of power factor correction is by this discharge circuit release electric charge, thus accelerate electric charge release rate, decrease the stand-by period that projector's stand-by power consumption is measured, improve plant produced speed.
Accompanying drawing explanation
Fig. 1 is the discharge circuit block diagram of a preferred embodiment of the present invention;
Fig. 2 is a preferred embodiment of the present invention discharge circuit schematic diagram;
Fig. 3 is another preferred embodiment discharge circuit schematic diagram of the present invention;
Fig. 4 is a preferred embodiment of the present invention projector schematic diagram;
Fig. 5 is a preferred embodiment of the present invention projector stand-by power consumption measurement procedure figure.
Embodiment
For making there is further understanding to object of the present invention, structure, feature and function thereof, embodiment is hereby coordinated to be described in detail as follows.
As shown in Figure 1, be a preferred embodiment of the present invention discharge circuit block diagram.The invention provides a kind of discharge circuit 101, this discharge circuit 101 is applied to projector.This projector is DLP type projector, and this projector comprises the power supply unit 103 with pfc circuit 104, and this power supply unit 103 provides multiple power supply for this projector.Wherein, the quantity of described power supply sets according to the needs of actual circuit structure in projector.In the present embodiment, this power supply unit 103 provides the first power supply and second source for this projector, and wherein, this first power supply is P12V power supply 105, and second source is P3PV power supply 106, and this pfc circuit 104 has capacity cell (not shown in FIG.).This discharge circuit 101 is electrically connected at this power supply unit 103, the control circuit 102 that this discharge circuit 101 comprises on-off circuit 109 and is electrically connected with this on-off circuit 109.This on-off circuit 109 is for controlling capacity cell electric discharge in this pfc circuit 104.This control circuit 102 is for controlling cut-off and the conducting of this on-off circuit 109, this control circuit 102 is electrically connected at this power supply unit 103 and this pfc circuit 104 simultaneously, namely this control circuit 102 can receive P12V signal 107 and PFC signal 108 simultaneously, voltage signal in the P12V power supply 105 that this P12V signal 107 provides for this power supply unit 103, this PFC signal 108 is the voltage signal in this pfc circuit 104.Wherein, when described projector is in running order, this power supply unit 103 starts, and this power supply unit 103 provides P12V power supply 105 and P3PV power supply 106 for this projector, and to the capacity cell charging in this merit pfc circuit 104.Now, this P12V signal 107 that this control module 102 receives simultaneously is noble potential and PFC signal 108 is noble potential, and wherein, this PFC signal 108 is noble potential, and the voltage namely in this pfc circuit 104 is in noble potential, represents that this projector is in running order.This control module 102, according to the P12V signal 107 received and PFC signal 108, controls this on-off circuit 109 and disconnect, thus this discharge circuit 101 does not start.Namely when projector normally works, the stand-by power consumption of this projector can not being measured, also just without the need to discharging to pfc circuit 104 in this projector, thus also just starting without the need to this discharge circuit 103.When described projector is in holding state, now, because the electric capacity in this pfc circuit 104 stores electric charge, now can not measure the stand-by power consumption of this projector, need that the capacity cell in this pfc circuit 104 is stored electric charge and discharge.But in prior art, the electric charge that capacity cell stores can only pass through micro-control unit (MCU) and discharge, micro-control unit release electric charge speed slowly.And in the present invention, increased discharge circuit 101, accelerate the release storing electric charge.When this projector is in holding state, be electronegative potential in this pfc circuit 104.Now, this control circuit 102 receive this P12V signal 107 for noble potential and this PFC signal 108 be electronegative potential.This control circuit 102, according to the signal received, controls this on-off circuit 109 and closes.This discharge circuit 101 also has the first resistance R1 and the second resistance R2.Wherein, dividing potential drop when this first resistance R1 and the second resistance R2 is for discharging, protects this on-off circuit 109.This on-off circuit 109 is by this first resistance R1 and the second resistance R2 ground connection.Namely capacity cell in this pfc circuit 104 discharges electric charge by this discharge circuit 101.
In order to the principle of work of clearer description discharge circuit of the present invention.As shown in Figure 2, be a preferred embodiment of the present invention discharge circuit schematic diagram.The invention provides a kind of discharge circuit 203, this discharge circuit 203 is in projector, and this discharge circuit 203 is connected to P12V power supply 201 and P3P3V power supply 202, and this P12V power supply 201 and P3P3V power supply 202 are also connected with capacity cell (not shown in FIG.).When this projector is in holding state, the electric charge stored in capacity cell can discharge by this discharge circuit 203 fast, thus is convenient to the measurement of this projector's stand-by power consumption.This discharge circuit 203 comprises the first on-off circuit 204, second switch circuit 205 and control circuit 210.Wherein, this first on-off circuit 204 and second switch circuit 205 folding simultaneously.This first on-off circuit 204 one end is electrically connected at P12V power supply 201, other end ground connection.This first on-off circuit 204 comprises P-channel enhancement type field effect transistor M1, triode Q1, resistance R1 and resistance R2.The source electrode of this P-channel enhancement type field effect transistor M1 is connected to this P12V power supply 201.The drain electrode of this P-channel enhancement type field effect transistor M1 is by resistance R1 ground connection, and the grid of this P-channel enhancement type field effect transistor M1 is connected to the collector of this triode Q1.The collector of this triode Q1 is connected to this P12V power supply 201 by resistance R2, and the base stage of this triode Q1 is connected to this control circuit 210, the grounded emitter of this triode Q1.This second switch circuit 205 one end is electrically connected at P3P3V power supply 202, other end ground connection.This second switch circuit 203 comprises P-channel enhancement type field effect transistor M2, triode Q2, resistance R3 and resistance R4.The source electrode of this P-channel enhancement type field effect transistor M2 is connected to this P3P3V power supply 202.The drain electrode of this P-channel enhancement type field effect transistor M2 is by resistance R4 ground connection, and the grid of this P-channel enhancement type field effect transistor M2 is connected to the collector of this triode Q2.The collector of this triode Q2 is connected to this P3P3V power supply 202 by resistance R3, and the base stage of this triode Q2 is connected to this control circuit 210, the grounded emitter of this triode Q2.This first on-off circuit 204 and this second switch circuit 205 are all connected to this control circuit 210.This control circuit 210 comprises AND circuit 209 and not circuit 208.The output terminal of this AND circuit 209 is connected to the base stage of triode Q1 and triode Q2 simultaneously.One input end of this AND circuit 209 is connected to P12V signal 206, and this P12V signal 206 is the voltage signal in this P12V power supply 201.This another input end of AND circuit 209 is connected to PFC signal 207 by not circuit 208.This PFC signal 207 is the voltage signal 207 in this circuit of power factor correction.Namely the input end of this AND circuit 209 accepts the voltage signal in P12V power supply and the voltage signal in circuit of power factor correction respectively.The relation of this discharge circuit 203 and this P12V signal 206 and PFC signal 207, as following table:
| P12V signal | PFC signal | Discharge circuit on off state |
| High | High | Disconnect |
| High | Low | Conducting |
| Low | High | Disconnect |
| Low | Low | Disconnect |
Wherein, P12V signal 206 is high, and now this P12V power supply 201 starts.This P12V signal 206 is low, and now this P12V power supply 201 does not start.When PFC signal 207 is high, now projector is in running order.When PFC signal 207 is low, now projector is in holding state or off-position (i.e. projector's power line cables off-state).
When PFC signal 207 is high, namely in this pfc circuit, voltage is noble potential, now projector is in running order, no matter P12V signal 206 is high or low, namely in the P12V power supply that receives of this AND circuit, voltage is noble potential or electronegative potential, the output terminal of this AND circuit 209 is all electronegative potential, namely the base stage of triode Q1 and triode Q2 is all electronegative potential, triode Q1 and triode Q2 ends, the grid of P-channel enhancement type field effect transistor M1 and P-channel enhancement type field effect transistor M2 is all noble potential, P-channel enhancement type field effect transistor M1 and P-channel enhancement type field effect transistor M2 ends, namely this first on-off circuit 204 and second switch circuit 205 all disconnect, thus this discharge circuit 203 does not start.When this PFC signal 207 is high, namely when in this pfc circuit, voltage is electronegative potential, and this P12V signal is high, namely this AND circuit 209 receive in P12V power supply voltage be noble potential, now projector is in holding state, the output terminal of this AND circuit 209 is all noble potential, namely the base stage of triode Q1 and triode Q2 is all noble potential, triode Q1 and triode Q2 all conductings, the grid of P-channel enhancement type field effect transistor M1 and P-channel enhancement type field effect transistor M2 is all electronegative potential, P-channel enhancement type field effect transistor M1 and P-channel enhancement type field effect transistor M2 all conductings, namely this first on-off circuit 204 and second switch circuit 205 all closed, thus this discharge circuit 203 starts.The electric charge that then in power supply unit, electric capacity stores discharges by this discharge circuit 203.When this PFC signal 207 is low, when namely in this pfc circuit, voltage is electronegative potential, and this P12V signal 206 is high, namely this AND circuit 209 receive in P12V power supply voltage be electronegative potential, now projector's power line cables disconnects.The output terminal of this AND circuit 209 is electronegative potential, namely the base stage of triode Q1 and triode Q2 is all electronegative potential, triode Q1 and triode Q2 ends, the grid of P-channel enhancement type field effect transistor M1 and P-channel enhancement type field effect transistor M2 is all noble potential, P-channel enhancement type field effect transistor M1 and P-channel enhancement type field effect transistor M2 ends, namely this first on-off circuit 204 and second switch circuit 205 all disconnect, thus this discharge circuit 203 does not start.Namely now projector's power line cables disconnects, thus does not need the stand-by power consumption measuring this projector.Also just need not open this discharge circuit 203 and carry out release electric charge.It should be noted that, provide only P12V power supply and P3P3V power supply in this embodiment, but be not limited thereto, then when increasing or reduce number of power sources, only need to increase identical coupled switch again in discharge circuit.
As shown in Figure 3, be another preferred embodiment discharge circuit schematic diagram of the present invention.The invention provides a kind of discharge circuit 303, this discharge circuit 303 is in projector, and this discharge circuit 303 is connected to P12V power supply 301 and P3P3V power supply 302, and this P12V power supply 301 and P3P3V power supply 302 are also connected with capacity cell (not shown in FIG.).When this projector is in holding state, the electric charge stored in capacity cell can discharge by this discharge circuit 303 fast, thus is convenient to the measurement of this projector's stand-by power consumption.This discharge circuit 303 comprises the first on-off circuit 304, second switch circuit 305 and control circuit 310.Wherein, this first on-off circuit 304 and second switch circuit 305 folding simultaneously.This first on-off circuit 304 one end is electrically connected at P12V power supply 301, other end ground connection.This first on-off circuit 304 comprises N channel enhancement field effect transistor M3 and resistance R5.The source electrode of this N channel enhancement field effect transistor M3 is connected to this P12V power supply 301.The drain electrode of this N channel enhancement field effect transistor M3 is by resistance R5 ground connection, and the grid of this N channel enhancement field effect transistor M1 is connected to this control circuit 310.This second switch circuit 305 one end is electrically connected at P3P3V power supply 302, other end ground connection.This second switch circuit 303 comprises N channel enhancement field effect transistor M4 and resistance R6.The source electrode of this N channel enhancement field effect transistor M4 is connected to this P3P3V power supply 302.The drain electrode of this N channel enhancement field effect transistor M4 is by resistance R6 ground connection, and the grid of this N channel enhancement field effect transistor M4 is connected to this control circuit 310.This first on-off circuit 304 and this second switch circuit 305 are all connected to this control circuit 310.This control circuit 310 comprises AND circuit 309 and not circuit 308.The output terminal of this AND circuit 309 is connected to the grid of N channel enhancement field effect transistor M3 and N channel enhancement field effect transistor M4 simultaneously.One input end of this AND circuit 309 connects in P12V signal 306, and this P12V signal 306 is the voltage signal in this P12V power supply 301.This another input end of AND circuit 309 is connected to PFC signal 307 by not circuit 308, and this PFC signal 307 is the voltage signal in this pfc circuit (not shown in FIG.).Namely the input end of this AND circuit 309 accepts the voltage signal in P12V power supply and the voltage signal in pfc circuit respectively.
This discharge circuit 303 with the pass of this P12V signal 306 and PFC signal 307 is: when this PFC signal 307 is for high, namely when in this pfc circuit, voltage signal is noble potential, now projector is in running order, no matter P12V signal 306 is high or low, namely in the P12V power supply that no matter this AND circuit receives, voltage signal is noble potential or electronegative potential, the output terminal of this AND circuit 309 is all electronegative potential, namely the grid of N channel enhancement field effect transistor M3 and N channel enhancement field effect transistor M4 is all electronegative potential, N channel enhancement field effect transistor M3 and N channel enhancement field effect transistor M4 ends, namely this first on-off circuit 304 and second switch circuit 305 all disconnect, thus this discharge circuit 303 does not start.When this PFC signal 307 is high, namely when in this PFC positive circuit, voltage signal is electronegative potential, and this P12V signal 306 is high, namely this AND circuit 309 receive in P12V power supply voltage signal be noble potential, now projector is in holding state, the output terminal of this AND circuit 309 is all noble potential, namely the grid of N channel enhancement field effect transistor M3 and N channel enhancement field effect transistor M4 is all noble potential, N channel enhancement field effect transistor M3 and N channel enhancement field effect transistor M4 all conductings, namely this first on-off circuit 304 and second switch circuit 305 all closed, thus this discharge circuit 303 starts.The electric charge that then in power supply unit, electric capacity stores discharges by this discharge circuit 303.When this PFC signal is low, when namely in this pfc circuit, voltage signal is electronegative potential, and this P12V signal is low, namely this AND circuit 309 receive in P12V power supply voltage signal be electronegative potential, now projector's power line cables disconnects.The output terminal of this AND circuit 309 is electronegative potential, namely the grid of N channel enhancement field effect transistor M3 and N channel enhancement field effect transistor M4 is all electronegative potential, N channel enhancement field effect transistor M3 and N channel enhancement field effect transistor M4 ends, namely this first on-off circuit 304 and second switch circuit 305 all disconnect, thus this discharge circuit 303 does not start.Namely now projector's power line cables disconnects, thus does not need the stand-by power consumption measuring this projector.Also just need not open this discharge circuit 303 and carry out release electric charge.
As shown in Figure 4, be the schematic diagram of a preferred embodiment of the present invention projector.This projector 400 is DLP type projector.This projector 400 comprises power supply unit 401 and mainboard 402.Wherein, this power supply unit 401 has pfc circuit 403, containing capacity cell in this pfc circuit 403, thus when this projector 400 works, stores electric charge in described capacity cell.This power supply unit 401 provides multiple power supply for the mainboard 402 in this projector.In the present embodiment, this power supply unit 401 provides the first power supply and second source for mainboard 402, and wherein, the first power supply is P12V power supply 404, and second source is P3P3V power supply 406.This mainboard 402 has discharge circuit 407, and this discharge circuit 407 can produce PFC signal 405, thus controls pfc circuit 403 in power supply unit 401.When this projector 400 is in holding state, this discharge circuit 407 is for dischargeing the electric charge in pfc circuit 403 in time.Simultaneously when this projector 400 is in running order or off-position time, this discharge circuit 407 does not work, thus discharges without the need to controlling pfc circuit 403.After pfc circuit 403 discharges the electric charge of storage by this discharge circuit 407, namely stand-by power consumption test 409 carries out the measurement of stand-by power consumption by the power line cables 408 of this projector 400.Projector of the prior art does not have discharge circuit, when carrying out the measurement of stand-by power consumption to projector, often owing to storing electric charge in pfc circuit, thus causes stand-by power consumption to measure.The micro-control unit that its inside can only be thrown by projector carries out consumption storage electric charge, but micro-control unit power consumption is little, storing charge consumption slow, causing when testing the stand-by power consumption of projector, need wait just can measure afterwards for 2 to 3 minutes, so just greatly reduce plant produced efficiency.And the present invention is by setting up a discharge circuit 407, when projector is in holding state, this discharge circuit 407 can accelerate the consumption storing electric charge in pfc circuit 403, thus is convenient to the measurement of this projector's stand-by power consumption.Shown in composition graphs 1, this discharge circuit 407 is electrically connected at power supply unit 401.The control circuit that this discharge circuit 407 comprises on-off circuit and is electrically connected with this on-off circuit.This on-off circuit is for controlling capacity cell electric discharge in this pfc circuit.This control circuit is for controlling cut-off and the conducting of this on-off circuit, and this control circuit can receive the voltage signal in the power supply signal and this pfc circuit that this power supply unit provides simultaneously.Wherein, when described projector is in running order, this power supply unit starts, and this power supply unit provides power supply for this projector, and to the capacity cell charging in this pfc circuit.Now, this control module receives the noble potential of this power supply and the noble potential in this circuit of power factor correction simultaneously, and now this projector is in running order.This control module controls this on-off circuit according to the signal received and disconnects, thus this discharge circuit does not start.When described projector is in holding state, because the electric capacity in this pfc circuit stores electric charge, thus the stand-by power consumption of this projector can not be measured, need that the capacity cell in this pfc circuit is stored electric charge and discharge.Now, in this pfc circuit be electronegative potential.This control circuit receives the noble potential of power supply and the electronegative potential in this pfc circuit.This control circuit controls this on-off circuit according to the signal received and closes.This on-off circuit ground connection, thus namely the capacity cell in this pfc circuit discharges electric charge rapidly by this discharge circuit, thus be convenient to the measurement of this projector's stand-by power consumption, and the stand-by power consumption long time to be detected such as not need, improve the speed of plant produced projector.
As shown in Figure 5, be a preferred embodiment of the present invention projector stand-by power consumption measuring method process flow diagram.This projector's stand-by power consumption measuring method comprises: step S101, when this projector is in holding state, described control circuit detects the electric signal in this projector, and it is closed to control this on-off circuit, this discharge circuit starts, and described power supply unit stores electric charge by the release of this discharge circuit.At present when carrying out stand-by power consumption to this projector and measuring, often store electric charge in pfc circuit in projector, thus cause this projector's stand-by power consumption to measure.In projector produces, after needing to wait for that projector consumes storage electric charge by micro-control unit, the stand-by power consumption of projector could be measured, but the power consumption of micro-control unit is little, store charge consumption speed slow, usually, when measuring the stand-by power consumption of projector, needing wait 2 to 3 minutes, thus have impact on plant produced efficiency.The present invention accelerates projector's storage electric charge release by increasing a discharge circuit in projector, thus decreases the stand-by period of projector's stand-by power consumption measurement, and then improves the production efficiency of factory.It should be noted that, this discharge circuit is according to the automatic star t-up discharge of the duty of projector, thus is convenient to the measurement of follow-up projector stand-by power consumption.This discharge circuit ground connection simultaneously, improves power supply unit and store charge consumption speed, and the power consumption of this discharge circuit is less.Shown in composition graphs 4, this projector comprises the power supply unit with pfc circuit, containing capacity cell in this pfc circuit.When this projector works, this power supply unit will charge to capacity cell, thus store electric charge in described capacity cell.This projector also has discharge circuit, the control circuit that this discharge line comprises on-off circuit and is electrically connected with this on-off circuit.When this projector is in holding state, described control circuit detects the electric signal in this projector, and it is closed to control this on-off circuit, this discharge circuit starts, electric charge in pfc circuit discharges by this discharge circuit in time, namely carries out the measurement of stand-by power consumption by the power line cables of this projector.Thus be convenient to the measurement of this projector's stand-by power consumption.In addition, when this projector is in running order or off-position time, now, do not need to carry out stand-by power consumption test to this projector, thus this discharge circuit does not work.
Step 2, by the power line cables of this projector, measures the stand-by power consumption of this projector.By above-mentioned steps one, after the electric charge that projector stores is discharged, namely by the power line cables of this projector, the stand-by power consumption of this projector is measured.The measurement of the stand-by power consumption of this projector can be measured by direct power meter, also measured by reometer.Such as, when carrying out by reometer the stand-by power consumption measuring projector, by measuring the electric current in projector's power line cables, Zai Yu city voltage coordinates and can obtain the stand-by power consumption of this projector.Compared with prior art, the present invention can effectively reduce the stand-by period of projector's stand-by power consumption measurement by projector of the present invention stand-by power consumption measuring method, improves plant produced efficiency.
The present invention is described by above-mentioned related embodiment, but above-described embodiment is only enforcement example of the present invention.Must it is noted that the embodiment disclosed limit the scope of the invention.On the contrary, 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 (11)
1. a discharge circuit, be applied to projector, this projector comprises the power supply unit with circuit of power factor correction, this power supply unit provides multiple power supply for this projector, this circuit of power factor correction has capacity cell, it is characterized in that, this discharge circuit is electrically connected at this power supply unit, the control circuit that this discharge circuit comprises on-off circuit and is electrically connected with this on-off circuit, this on-off circuit is for controlling capacity cell electric discharge in this circuit of power factor correction, this control circuit is for controlling cut-off and the conducting of this on-off circuit, this control circuit is electrically connected at this power supply unit and this circuit of power factor correction simultaneously,
Wherein, when described projector is in running order, this power supply unit starts, and to the capacity cell charging in this circuit of power factor correction, this on-off circuit ends; When described projector is in holding state, this on-off circuit conducting, the capacity cell in this circuit of power factor correction is by this discharge circuit release electric charge.
2. discharge circuit as claimed in claim 1, it is characterized in that, this on-off circuit comprises P-channel enhancement type field effect transistor and triode.
3. discharge circuit as claimed in claim 2, it is characterized in that, the drain electrode of this P-channel enhancement type field effect transistor is by the first resistance eutral grounding, and the grid of this P-channel enhancement type field effect transistor is connected to the collector of this triode, and the source electrode of this P-channel enhancement type field effect transistor is connected to this power supply unit.
4. discharge circuit as claimed in claim 2, it is characterized in that, the collector of this triode is connected to this power supply unit by the second resistance, and the base stage of this triode is connected to this control circuit, the grounded emitter of this triode.
5. discharge circuit as claimed in claim 1, it is characterized in that, this on-off circuit comprises N channel enhancement field effect transistor.
6. discharge circuit as claimed in claim 5, it is characterized in that, the drain electrode of this N channel enhancement field effect transistor is by the first resistance eutral grounding, and the grid of this N channel enhancement field effect transistor is connected to control circuit, and the source electrode of this N channel enhancement field effect transistor is connected to this power supply unit.
7. discharge circuit as claimed in claim 1, it is characterized in that, this control circuit comprises AND circuit.
8. discharge circuit as claimed in claim 7, is characterized in that, the input end of this AND circuit is electrically connected at this power supply unit and this circuit of power factor correction respectively.
9. discharge circuit as claimed in claim 8, its feature exists, and this AND circuit is connected to this circuit of power factor correction by not circuit.
10. a projector, it comprises the power supply unit with circuit of power factor correction, this power supply unit provides power supply for this projector, this circuit of power factor correction has capacity cell, it is characterized in that, this projector system also comprises discharge circuit, and this discharge circuit is discharge circuit described in the claims 1 to 9 any.
The measuring method of 11. 1 kinds of projector's stand-by power consumptions, this projector has power supply unit, it is characterized in that, this projector also has discharge circuit, the control circuit that this discharge circuit comprises on-off circuit and is electrically connected with this on-off circuit, and the method comprises:
Step one, when this projector is in holding state, described control circuit detects the electric signal in this projector, and it is closed to control this on-off circuit, and this discharge circuit starts, and described power supply unit stores electric charge by the release of this discharge circuit;
Step 2, by the power line cables of this projector, measures the stand-by power consumption of this projector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310180103.6A CN103324115B (en) | 2013-05-15 | 2013-05-15 | Discharge circuit and apply the projector of this discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310180103.6A CN103324115B (en) | 2013-05-15 | 2013-05-15 | Discharge circuit and apply the projector of this discharge circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103324115A CN103324115A (en) | 2013-09-25 |
| CN103324115B true CN103324115B (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310180103.6A Expired - Fee Related CN103324115B (en) | 2013-05-15 | 2013-05-15 | Discharge circuit and apply the projector of this discharge circuit |
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| Country | Link |
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| CN (1) | CN103324115B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110611354B (en) * | 2019-10-11 | 2021-11-26 | 苏州浪潮智能科技有限公司 | Discharging structure and charging and discharging structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080049464A1 (en) * | 2006-08-23 | 2008-02-28 | Benq Corporation | Electronic apparatus, AC/DC conversion device and power factor correction circuit thereof |
| CN101199118A (en) * | 2004-01-08 | 2008-06-11 | 汤姆森特许公司 | Power supply unit having an off-delay switching circuit |
-
2013
- 2013-05-15 CN CN201310180103.6A patent/CN103324115B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101199118A (en) * | 2004-01-08 | 2008-06-11 | 汤姆森特许公司 | Power supply unit having an off-delay switching circuit |
| US20080049464A1 (en) * | 2006-08-23 | 2008-02-28 | Benq Corporation | Electronic apparatus, AC/DC conversion device and power factor correction circuit thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103324115A (en) | 2013-09-25 |
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