CN101369772B - Circuit and method for implementing two operating status - Google Patents
Circuit and method for implementing two operating status Download PDFInfo
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- CN101369772B CN101369772B CN 200710141686 CN200710141686A CN101369772B CN 101369772 B CN101369772 B CN 101369772B CN 200710141686 CN200710141686 CN 200710141686 CN 200710141686 A CN200710141686 A CN 200710141686A CN 101369772 B CN101369772 B CN 101369772B
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Abstract
The invention relates to a circuit and method for implementing two operational states. By means of integrating a frequency generator circuit and a small signal control circuit, a first operation frequency is obtained when the frequency generator circuit is running normally, and the frequency generator circuit can rerun with a second operation frequency by the small signal control circuit when switching on the power supply again after a presetting time interval. Thereby, two different operational states can be implemented. The invention can implement two-step light regulation combining a wall switch for a low voltage discharge lamp.
Description
Technical field
The present invention relates to a kind of circuit for service load and method, especially relate to a kind of circuit and method be used to realizing two kinds of modes of operation.
Background technology
Energy consumption is necessary in people's daily life, but due to the shortage of energy in society now, energy-conservationly more and more receives publicity.Illumination occupies the significant proportion in energy consumption, therefore, for conserve energy, usually researches and develops new illuminating material or new lighting technology.The tunable optical technology becomes more and more popular as the method for lighting energy saving, but in many tunable optical circuit, for example substep tunable optical circuit is used as controller with integrated circuit usually, perhaps the continuous light tuning circuit need to use extra dimmer to ballast circuit, the cost of these ballast light modulation schemes is relatively costly, and is more difficult acceptance for most of domestic consumers.In addition, in some cases, the user even needs to change the function that its switch on wall obtains tunable optical, and this is very inconvenient.
Now, develop a kind of method simply, cheaply and easily and solved these problems.
Summary of the invention
Target of the present invention is to provide a kind of circuit and method be used to realizing two kinds of modes of operation.This circuit and method are by integrating frequency generator circuit and small-signal control circuit, make and obtain the first frequency of operation when frequency generator circuit works, and when again switching on power after power cutoff and within the several seconds of setting, make frequency generator circuit rerun with the second frequency of operation by the small-signal control circuit.
According to an aspect of the present invention, frequency generator circuit is general half-bridge oscillation circuit, and it has two switch elements and two LC oscillation networks, and has the starting network that is made of resistor, capacitor, diode, bidirectional trigger diode.
According to an aspect of the present invention, the small-signal control circuit comprises RC control circuit, trigger switch circuit and frequency control circuit.The RC control circuit is made of resistor, electrolytic capacitor and switch element, be used for to control the anode voltage of diode of the starting network of half-bridge oscillation circuit.The trigger switch circuit comprises resistor, capacitor, diode, Zener diode and silicon controlled rectifier, and its trigger voltage is from the voltage at the resistance two ends on the emitter of the switch element in the RC control circuit.Frequency control circuit comprises resistor, capacitor and switch element.
In solution of the present invention, after switching on power, half-bridge oscillation circuit moves with the first frequency of operation, when reclosing power supply after power cutoff and in the several seconds of setting, at first the RC control circuit provides trigger voltage for the trigger switch circuit, change the state of frequency control circuit with controlled voltage, thereby make general half-bridge oscillation circuit rerun with the second frequency of operation.Obtain thus two kinds of different frequency of operation, realize two kinds of different modes of operation.
In a circuit according to the invention with method preferably in low-pressure discharge lamp the combining wall wall switch can realize two step optical modes.And operation is very easy for it, and the user does not even need to change switch on wall.
Remarkable advantage with method is simple, convenient and cheap in a circuit according to the invention.
Description of drawings
Explain concrete exemplary embodiment of the present invention below with reference to Fig. 1 to Fig. 5.Feature described herein and details itself or be important for the present invention in conjunction with other unshowned feature and details.
Fig. 1 illustrates a practical circuit, this practical circuit graphic extension, small-signal control circuit and general half-bridge oscillation circuit integrate, to realize two kinds of different modes of operation, wherein, this control circuit comprises RC control circuit, trigger switch circuit and frequency control circuit.
Fig. 2 illustrates a practical circuit, this practical circuit except trigger part is different all corresponding to the circuit of Fig. 1.
Fig. 3 illustrates a practical circuit, and this practical circuit is except the connection of the base stage of transistor Q3 and increase electrolytic capacitor and Zener diode all circuit corresponding to Fig. 1.
Fig. 4 illustrates a practical circuit, this practical circuit except transistor Q3 being changed into silicon controlled rectifier SCR2 all corresponding to the circuit of Fig. 1.
Fig. 5 illustrates a practical circuit, this practical circuit except the method that produces trigger voltage all corresponding to the circuit of Fig. 1.
Embodiment
Fig. 1 to 5 illustrates respectively the independently exemplary embodiment for low-pressure discharge lamp, and these embodiment distinguish mutually in layout and the configuration aspects of control circuit.
Fig. 1 illustrates two circuit: a circuit is general half-bridge oscillation circuit, and another circuit is simple small-signal control circuit.But, the invention is not restricted to low-pressure discharge lamp as load or be not limited to general half-bridge oscillation circuit.
In Fig. 1, the supply voltage of rectification (pulsating dc voltage) is represented by VDC.Resistor R1, capacitor C1, diode D1, bidirectional trigger diode DB3 consist of the starting circuit of half-bridge oscillation circuit.Half-bridge oscillation circuit has two transistor Q1, Q2 that are connected in series, and has two LC oscillation networks that are made of respectively inductor L1-a, L1-b, resistor R2, R5 and capacitor C2, C3.In starting circuit, resistor R1 and capacitor C1 be connected on supply voltage VDC and reference potential () between, the end of resistor R1 is connected to supply voltage VDC, and the end of capacitor C1 is connected to reference potential.The anodic bonding of diode D1 is to the tie point of resistor R1 and capacitor C1, and this tie point is called as node 1 hereinafter.And the negative electrode of diode D1 is connected to the emitter of the transistor Q2 in half-bridge oscillation circuit.Simultaneously, bidirectional trigger diode DB3 also is connected between the base stage of node 1 and transistor Q2.When the user switches to "On" state with switch on wall, apply VDC voltage, capacitor C1 charges with exponential manner by resistor R1.When the voltage at capacitor C1 two ends reached the trigger value of bidirectional trigger diode DB3, this bidirectional trigger diode DB3 connected, and capacitor C1 discharges in the Base-Emitter network of transistor Q2, thereby connected transistor Q2.Then, capacitor C1 avoids bidirectional trigger diode DB3 again to connect by diode D1 and transistor Q2 discharge, and this moment, the voltage of node 1 was relatively low, and the voltage of this node 1 is assumed to be V0.
The small-signal control circuit comprises RC control circuit, trigger switch circuit and frequency control circuit.
The RC control circuit comprises resistor R3, R6, R7, R8, electrolytic capacitor C4, transistor Q3 and Q4.In the RC control circuit, resistor R3 and electrolytic capacitor C4 are connected between supply voltage and reference potential, and the end of resistor R3 is connected to supply voltage VDC, and the negative pole of electrolytic capacitor C4 is connected to reference potential.Resistor R6 is connected between the base stage of the tie point of resistor R3 and electrolytic capacitor C4 and transistor Q4.The collector electrode of transistor Q4 is connected to the anode of the diode D1 in general half-bridge oscillation circuit.The emitter of transistor Q4 is connected to reference potential by resistor R8.Resistor R7 is connected between the base stage and reference potential of transistor Q4.The collector electrode of transistor Q3 is connected to the tie point of resistor R3 and electrolytic capacitor C4, and its emitter is connected to reference potential.
The trigger switch circuit comprises resistor R4, R9, R10, capacitor C7, diode D4, Zener diode D2 and silicon controlled rectifier SCR1.In the trigger switch circuit, the anode of silicon controlled rectifier SCR1 is connected to supply voltage VDC by resistor R4.And the series circuit of the negative electrode of silicon controlled rectifier SCR1 by resistor R9 and R10 is connected to reference potential.The negative electrode of Zener diode D2 is connected to the emitter of transistor Q4, and its anodic bonding is to the anode of diode D4.The negative electrode of diode D4 is connected with the grid of silicon controlled rectifier SCR1, and this diode D4 is used for stablizing the be triggered voltage at resistor R9 after conducting, R10 two ends of silicon controlled rectifier SCR1.Be connected to capacitor C7 between the grid of silicon controlled rectifier SCR1 and reference potential, this capacitor C7 is used for preventing silicon controlled rectifier SCR1 false triggering.Simultaneously, the base stage of the transistor Q3 in the RC control circuit is connected to the tie point of resistor R9 and resistor R10.
Frequency control circuit comprises resistor R11, R12, R13, capacitor C5 and transistor Q5.In this frequency control circuit, the base stage of transistor Q5 is connected to the negative electrode of silicon controlled rectifier SCR1 by resistor R11.The emitter of transistor Q5 is connected to reference potential.And the collector electrode of transistor Q5 is connected to the base stage of the transistor Q2 in general half-bridge oscillation circuit.Resistor R13 and capacitor C5 are connected in parallel between the base stage and emitter of transistor Q5.And resistor R12 is connected between the tie point 2 of the tie point of base stage of resistor R13 and transistor Q5 and the inductor L1-a in the LC oscillation network and resistor R5.
When the user switches to "On" state with switch on wall, because the capacity of the Capacity Ratio capacitor C1 of electrolytic capacitor C4 is much larger, so the charging rate of the charging rate relative capacitor C1 of electrolytic capacitor C4 is very slow.Therefore, before half-bridge oscillation circuit started for the first time, electrolytic capacitor C4 can not be charged to the given magnitude of voltage of driving transistors Q4 saturation conduction, also just can not drag down the voltage of node 1.The breakdown conducting of DB3 this moment, half-bridge oscillation circuit begin to move with first frequency, and after normal operation, the voltage of node 1 is because capacitor C1 discharges and step-down by diode D1 and transistor Q2.So the voltage at resistor R8 two ends is also relatively low, and the voltage at hypothesis resistor R8 two ends is V2.But because V2 is lower than the puncture voltage of Zener diode D2, so do not have trigger current to trigger silicon controlled rectifier SCR1.Because silicon controlled rectifier SCR1 can not conducting, therefore do not control the mode of operation that voltage changes frequency control circuit, and do not control voltage and come driving transistors Q3.Suppose that power output is P1 under this state (being called as the first state), and the frequency of operation of oscillating circuit is f1.
After the half-bridge oscillation circuit starting, electrolytic capacitor C4 is charged to another given voltage level (supposing that this given magnitude of voltage is V1).If the user expects lower power output P2, the user switches to "Off" state with switch on wall, but must in setting-up time (x second), switch on wall be switched back "On" state, then obtain power output P2 under this state (being called as the second state).Its detailed process is: the user, switch on wall is switched to from "On" state "Off" state during this period of time in, the Base-Emitter network discharge of electrolytic capacitor C4 by transistor Q4.But within the several seconds of setting (be assumed to be x second), electrolytic capacitor C4 discharges into voltage level V3.When switch on wall is switched to "On" state again, voltage V3 still can driving transistors Q4 conducting, so that the voltage of node 1 becomes V4, but voltage V4 can be set to the value lower than the puncture voltage of bidirectional trigger diode DB3, and should be worth more much larger than voltage V0.So the RC control circuit still can be controlled the voltage of node 1, make its voltage can not reach the puncture voltage of bidirectional trigger diode DB3.Therefore, in this state, half-bridge oscillation circuit is not because the starting network is worked and fail to start, and still, the voltage at resistor R8 two ends has become voltage level V5.Voltage level V5 is greater than the puncture voltage of Zener diode D2, and therefore, Zener diode D2 is breakdown and be that the grid of silicon controlled rectifier SCR1 produces trigger current, with conducting silicon controlled rectifier SCR1.Therefore the voltage at resistor R9 and R10 two ends be applied to the base stage of transistor Q5.The voltage at resistor R9 two ends makes transistor Q3 saturation conduction, thereby reduces the base voltage of transistor Q4, makes transistor Q4 leave the saturation conduction state, and the voltage of node 1 increases and punctures bidirectional trigger diode DB3, and half-bridge oscillation circuit is reworked.But this moment, the base voltage of transistor Q5 changes, and its switching speed will increase so that the frequency of operation of half-bridge oscillation circuit change into f2 (f2＞f1), thus generation power output P2 (P2＜P1).
Fig. 2 illustrates the practical circuit that operation principle is similar to Fig. 1, but replaces silicon controlled rectifier SCR1 with TRIAC.
In Fig. 3, transistor Q3 obtains driving voltage from the emitter of transistor Q4, and increases Zener diode D3 and electrolytic capacitor C6.In circuit shown in Figure 3, resistor R8 and R10 are connected in series between the emitter and reference potential of transistor Q4, and the base stage of transistor Q3 is connected to the tie point of resistor R8 and R10 by Zener diode D3.The anodic bonding of Zener diode D3 is to the base stage of transistor Q3.And the negative electrode of silicon controlled rectifier SCR1 is connected to reference potential by resistor R9.The function of Zener diode D3 is that prevention transistor Q3 obtains base voltage and the electric current under the first state.Electrolytic capacitor C6 is connected between the base stage and emitter of transistor Q3, with delay crystal pipe Q3 saturation conduction, thereby guarantees that half-bridge oscillation circuit just can reset after silicon controlled rectifier SCR1 is triggered.Wherein, the positive pole of electrolytic capacitor C6 is connected to the base stage of transistor Q3.Also available TRIAC replaces silicon controlled rectifier SCR1, replaces transistor Q3 with silicon controlled rectifier.
Fig. 4 illustrates a practical circuit, this practical circuit except transistor Q3 being changed into silicon controlled rectifier SCR2 all corresponding to the circuit of Fig. 1.But the circuit of this circuit and Fig. 1 has following difference: under the second state, silicon controlled rectifier SCR2 will continue to reduce the base voltage of transistor Q4.
In Fig. 5, utilize mos field effect transistor Q6 to replace Zener diode D2 to produce trigger voltage.Wherein, the grid of mos field effect transistor Q6 is connected to the emitter of transistor Q4, and the grid that its drain electrode is connected to reference potential and is connected to silicon controlled rectifier SCR1 by diode D4 by resistor R15, its source electrode is connected to supply voltage VDC by resistor R14.As everyone knows, mos field effect transistor is voltage-controlled parts, and it has threshold voltage of the grid.Therefore, mos field effect transistor Q6 makes different responses under this two states.Under the first state, mos field effect transistor Q6 can not conducting.And under the second state, mos field effect transistor Q6 can be switched on to produce trigger voltage.
Although the example has by reference to the accompanying drawings carried out above description to the present invention, obviously the present invention is confined to this, but modifies in many ways within the disclosed scope of the claim of enclosing.
Claims (12)
1. circuit that is used for realizing two kinds of modes of operation, this circuit has a single frequency generator circuit and small-signal control circuit, it is characterized in that, this frequency generator circuit and this small-signal control circuit integrate, in order to obtain the first frequency of operation when frequency generator circuit works, and when again switching on power after power cutoff and in the several seconds of setting, make frequency generator circuit rerun with the second frequency of operation by the small-signal control circuit
Wherein, frequency generator circuit is general half-bridge oscillation circuit, and the small-signal control circuit comprises RC control circuit, trigger switch circuit and frequency control circuit; After switching on power, half-bridge oscillation circuit moves with the first frequency of operation, when reclosing power supply after power cutoff and in the several seconds of setting, at first the RC control circuit provides trigger voltage for the trigger switch circuit, change the state of frequency control circuit with controlled voltage, thereby make general half-bridge oscillation circuit rerun with the second different frequency of operation.
2. circuit according to claim 1, it is characterized in that, general half-bridge oscillation circuit has two switch element Q1, Q2 and two LC oscillation networks, and general half-bridge oscillation circuit also has the starting network that is made of resistor R1, capacitor C1, diode D1, bidirectional trigger diode DB3.
3. circuit according to claim 2, it is characterized in that, the RC control circuit comprises resistor R3, R6, R7, R8, electrolytic capacitor C4, switch element Q3 and Q4, wherein, the negative pole of electrolytic capacitor C4 is connected to reference potential, the collector electrode of switch element Q4 is connected to the anode of the diode D1 in general half-bridge oscillation circuit, the emitter of switch element Q4 is connected to reference potential by resistor R8, and tie point and its emitter that the collector electrode of switch element Q3 is connected to resistor R3 and electrolytic capacitor C4 are connected to reference potential.
4. circuit according to claim 3, it is characterized in that, the trigger switch circuit comprises resistor R4, R9, R10, capacitor C7, diode D4, Zener diode D2 and silicon controlled rectifier SCR1, wherein, the anode of silicon controlled rectifier SCR1 is connected to supply voltage (VDC) by resistor R4, and the series circuit of the negative electrode of silicon controlled rectifier SCR1 by resistor R9 and R10 is connected to reference potential, the negative electrode of Zener diode D2 is connected to the emitter of switch element Q4, and its anodic bonding is to the anode of diode D4, the negative electrode of diode D4 is connected with the grid of silicon controlled rectifier SCR1, be connected with capacitor C7 between the grid of SCR1 and reference potential, the base stage of switch element Q3 is connected to the tie point of resistor R9 and resistor R10.
5. circuit according to claim 4, is characterized in that, silicon controlled rectifier SCR1 can utilize TRIAC to replace.
6. circuit according to claim 4, it is characterized in that, increase Zener diode D3 and electrolytic capacitor C6, wherein, resistor R8 and R10 are connected in series between the emitter and reference potential of switch element Q4, the base stage of switch element Q3 is connected to the tie point of resistor R8 and R10 by Zener diode D3, the anodic bonding of Zener diode D3 is to the base stage of switch element Q3, and the negative electrode of silicon controlled rectifier SCR1 is connected to reference potential by resistor R9, the positive pole of electrolytic capacitor C6 is connected to the base stage of switch element Q3, and the negative pole of electrolytic capacitor C6 is connected to the emitter of switch element Q3.
7. circuit according to claim 6, is characterized in that, utilizes mos field effect transistor Q6 to replace Zener diode D2.
8. one of according to claim 3-7 described circuit, is characterized in that, switch element Q3 is transistor or silicon controlled rectifier, and switch element Q1, Q2, Q4 are transistors.
9. one of according to claim 3-7 described circuit, it is characterized in that, frequency control circuit comprises resistor R11, resistor R12, resistor R13, capacitor C5 and switch element Q5, wherein, the base stage of switch element Q5 is connected to the negative electrode of silicon controlled rectifier SCR1 by resistor R11, the emitter of switch element Q5 is connected to reference potential, and the collector electrode of switch element Q5 is connected to the base stage of the switch element Q2 in general half-bridge oscillation circuit, resistor R13 and capacitor C5 are connected in parallel between the base stage and emitter of switch element Q5, and resistor R12 is connected between the tie point of the tie point of base stage of resistor R13 and switch element Q5 and the inductor L1-a in oscillating circuit and resistor R5.
10. circuit according to claim 9, is characterized in that, switch element Q5 is transistor.
11. method that is used for realizing two kinds of modes of operation, it is characterized in that, a single frequency generator circuit and small-signal control circuit are integrated, thereby when working, frequency generator circuit obtains the first frequency of operation, and when again switching on power after power cutoff and within the several seconds of setting, make frequency generator circuit rerun with the second frequency of operation by the small-signal control circuit
Wherein, frequency generator circuit is general half-bridge oscillation circuit, and the small-signal control circuit comprises RC control circuit, trigger switch circuit and frequency control circuit; After switching on power, half-bridge oscillation circuit moves with the first frequency of operation, when reclosing power supply after power cutoff and in the several seconds of setting, at first the RC control circuit provides trigger voltage for the trigger switch circuit, change the state of frequency control circuit with controlled voltage, thereby make general half-bridge oscillation circuit rerun with the second different frequency of operation.
12. method according to claim 11 is characterized in that, the method can realize two step light by the combining wall wall switch in low-pressure discharge lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710141686 CN101369772B (en) | 2007-08-17 | 2007-08-17 | Circuit and method for implementing two operating status |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710141686 CN101369772B (en) | 2007-08-17 | 2007-08-17 | Circuit and method for implementing two operating status |
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| Publication Number | Publication Date |
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| CN101369772A CN101369772A (en) | 2009-02-18 |
| CN101369772B true CN101369772B (en) | 2013-05-22 |
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| CN 200710141686 Expired - Fee Related CN101369772B (en) | 2007-08-17 | 2007-08-17 | Circuit and method for implementing two operating status |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571612A (en) * | 2003-07-21 | 2005-01-26 | 致伸科技股份有限公司 | Power supply converter for lamp |
| WO2005072023A1 (en) * | 2004-01-23 | 2005-08-04 | Koninklijke Philips Electronics N.V. | High frequency driver for gas discharge lamp |
-
2007
- 2007-08-17 CN CN 200710141686 patent/CN101369772B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571612A (en) * | 2003-07-21 | 2005-01-26 | 致伸科技股份有限公司 | Power supply converter for lamp |
| WO2005072023A1 (en) * | 2004-01-23 | 2005-08-04 | Koninklijke Philips Electronics N.V. | High frequency driver for gas discharge lamp |
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| Publication number | Publication date |
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| CN101369772A (en) | 2009-02-18 |
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