CN101030350B - Complete resonant circuit for restoring PDD energy - Google Patents

Abstract

The invention relates to a complete resonant plasma display panel (PDP) energy recovery circuit, which is an improvement of the common energy recovery circuit for the PDP. The common energy recovery circuit works in a non-complete resonant state, which has a certain energy loss, and has a certain impact to related components so as to influence the service life thereof. The circuit of the invention works in a complete resonant state, which not only realizes the energy recovery, but also forms no impact to switch devices because the energy supplement is finished in the whole resonance jump, and obviously reduces the energy loss and the electro magnetic interference (EMI) problems. The efficiency of the complete resonant PDP energy recovery circuit is improved by more than 10% than that of the ordinary energy recovery circuit.

Description

Complete resonant circuit for restoring PDD energy

(1) technical field

The present invention relates to the energy recovery circuit that a kind of plasma display panel PDP drives, especially a kind of complete resonant circuit for restoring PDD energy.

(2) technical background

Because PDP is a device that capacitive character is very big, in each charging and discharge process of screen, the energy consumption that has CpVs/2 is on the dead resistance and driving element of pcb board, and the power consumption of system can significantly increase like this, and can bring the EMI problem of system and stability to lower.Just because of this, in the design of PDP drive circuit system, proposed the notion that energy regains (ERC), promptly utilized LC resonant tank recovery section energy, to reduce energy loss and EMI.U.S. Pat 4.866.349 and US5.081.400 disclose a kind of PDP energy recovery circuit, its problem is that energy supplement switching tube conducting transient state is equivalent to load capacitance and power supply direct short-circuit, will produce certain temporary impact electric current and percussion power, also be the root of electromagnetic radiation.This situation will be avoided as possible for general electronic circuit.For PDP, because load capacitance is not very big, the Q value neither be very high, and the internal resistance of driving circuit is not very low, thereby can accept on the engineering, and is more a lot of than having discharged and recharged firmly of double amplitude in other words.But obviously do not optimize, can further improve.Just to further eliminate charging and discharging firmly of energy supplement process.

(3) summary of the invention:

The object of the present invention is to provide a kind of resonant condition completely that works in, realize that not only energy recovers, and finish in the process that replenishes whole resonance saltus step of energy, not to the impact of switching device, significantly reduce energy loss and EMI problem, can also reduce the working current of switching device or a kind of PDP energy recovery circuit of operating voltage respectively simultaneously.Implementation of the present invention is: 1 usefulness is adjustable, and the low-voltage compensation power supply replaces driving power; 2 are provided with the storage capacitor of being kept electric current by the additional screen of little current switch control; 3 saltus steps by two-way switch control series resonant tank.Keep by low-voltage compensation power supply, the first energy supplement switching tube and the second energy supplement switching tube, energy recovery series resonance inductance, two-way switch, screen promptly that electric current replenishes storage capacitor, screen is kept electric current replenishment control switching tube and combined.Low-voltage compensation power supply V ₀The positive pole and the first energy supplement switch transistor T ₁Drain electrode link to each other the negative pole and the second energy supplement switch transistor T ₂Source electrode link to each other the first energy supplement switch transistor T ₁The source electrode and the second energy supplement switch transistor T ₂Drain electrode link to each other back and D ₁, D ₂, D ₃, D ₄And T ₃The two-way switch that is combined into links to each other, the other end of two-way switch with link to each other every straight matching capacitance C1, every the other end and the energy recovery resonant inductance L of straight matching capacitance C1 ₁Link to each other energy recovery resonant inductance L ₁The other end with the screen capacitor C ₂Link to each other, screen is kept electric current and is replenished storage capacitor C ₃, keep electric current replenishment control switching tube and screen capacitor C by screen ₂Link to each other.At this low-voltage compensation power supply V ₀Voltage far below the operating voltage of screen and can regulate, adapting to different series loop Q values, operating voltage requirement and their variation; Form by switchable capacitance group every straight matching capacitance C1,, especially be adapted to the aging demand of PDP screen to produce different pulse rising and dropping characteristic; Two-way switch is by D ₁, D ₂, D ₃, D ₄And T ₃Be combined into and; Screen is kept electric current and is replenished storage capacitor C ₃Capacity greater than the screen capacitor C ₂, doubly be best with 5-10.

All PDP energy recovery circuits all are to utilize the resonant inductance that connects to constitute the LC resonant tank with screen electric capacity, recover energy.The relation of the Q value in each voltage jump voltage attenuation and loop can be drawn by following derivation.

$U_c=\frac{{\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="S07117618920070419E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_0{\mathrm{\&omega;}}_0}{\mathrm{\&omega;}}{e}^{-\mathrm{\&delta;t}}\sin (\mathrm{\&omega;t}+\mathrm{\&beta;})$

$\mathrm{\&delta;}=\frac{R}{2L},$ ${\mathrm{\&omega;}}_0=\frac{1}{\sqrt{\mathrm{LC}}},$ $\mathrm{\&omega;}=\sqrt{{\mathrm{\&omega;}}_0^2-{\mathrm{\&delta;}}^2}$

$U_L=\frac{{\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="S07117618920070419E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_0{\mathrm{\&omega;}}_0}{\mathrm{\&omega;}}{e}^{-\mathrm{\&delta;t}}\sin (\mathrm{\&omega;t}+\mathrm{\&beta;})$

$i=\frac{{\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="S07117618920070419E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_0{\mathrm{\&omega;}}_0}{\mathrm{\&omega;L}}{e}^{-\mathrm{\&delta;t}}\sin \left(\mathrm{\&omega;t}\right)$

I=0 when ω t=π, U _CMinimum:

$U_c=-\frac{{\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="S07117618920070419E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_0{\mathrm{\&omega;}}_0}{\mathrm{\&omega;}}{e}^{-\frac{\mathrm{\&delta;\&pi;}}{\mathrm{\&omega;}}}\sin \left(\mathrm{\&beta;}\right),$ Because $\sin \mathrm{\&beta;}=\frac{\mathrm{\&omega;}}{{\mathrm{\&omega;}}_0},$

$U_c=-U_0{e}^{-\frac{\mathrm{\&delta;\&pi;}}{\mathrm{\&omega;}}},$

$\frac{\mathrm{\&delta;\&pi;}}{\mathrm{\&omega;}}=\frac{\mathrm{\&pi;}}{\tan \mathrm{\&beta;}}=\mathrm{\&pi;}\frac{\frac{R}{2\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="S07117618920070419E000011.png,S07117618920070419E000031.png"\; state="\{\{state\}\}">L</figure-callout>}}}{\sqrt{\frac{1}{2L}-{\left(\frac{R}{2L}\right)}^2}}=\mathrm{\&pi;}\frac{1}{\sqrt{\frac{4L}{R^{2}C}-1}},$

Because: $Q=\frac{1}{R}\sqrt{\frac{L}{C}},$ $\frac{\mathrm{\&delta;\&pi;}}{\mathrm{\&omega;}}=\mathrm{\&pi;}\frac{1}{\sqrt{4Q^2-1}},$

If Q＞＞1, then $\frac{\mathrm{\&delta;\&pi;}}{\mathrm{\&omega;}}=\frac{\mathrm{\&pi;}}{2Q}$

$U_c=-U_0{e}^{-\frac{\mathrm{\&pi;}}{2Q}}$

If Q=20, U _c=-0.925U ₀

That is to say that the Q value is at 20 o'clock, the voltage attenuation of a saltus step process only is 7.5%.

C wherein ₂Be screen electric capacity, L ₁Be energy recovery resonant inductance, D ₁, D ₂, D ₃, D ₄And T ₃It is series resonant switched being combined into two-way switch, and C1 is every straight matching capacitance, can regulate rising or falling speed, T by changing matching capacitance only with a resonant inductance in the design of seasoned system ₁And T ₂Be energy supplement switching tube, C ₃Keep electric current for screen and replenish storage capacitor, T4 keeps electric current replenishment control switching tube for screen.

Power source voltage only need be replenished the voltage attenuation of saltus step process, and for example the Q value in loop is 20, saltus step amplitude 200V, and then power source voltage only is 15V, T ₁And T ₂Operating voltage also only be 15V.The conducting T of elder generation when its course of work is last jumping ₁, conducting D then ₁, D ₂, D ₃, D ₄And T ₃The two-way switch of forming, C ₁, L ₁And C ₂The resonant tank of forming makes voltage V ₃Jump; When V3 rises to when pressing than the high economize on electricity of VS, electric current has been close to 0, conducting T4 at this moment, the part of electric current provide screen luminous keep electric current, a part is charged to C3 by T4.When electric current is zero, turn-off T3, shield and luminous keep electric current by C ₃Pass through T ₄Provide.Turn-off T then ₄That elder generation's conducting is T during following saltus step ₂, remaining process is identical.All power device is soft switch.

The invention has the advantages that and make circuit working in resonant condition completely, realize that not only energy recovers, and finish in the process that replenishes whole resonance saltus step of energy, not to the impact of switching device, significantly reduce energy loss and EMI problem, simultaneously can also reduce their working current or operating voltage respectively, be a kind of complete resonant circuit for restoring PDD energy.

(4) description of drawings

Fig. 1 is an existing P DP energy recovery circuit;

Fig. 2 is the voltage current waveform of Fig. 1 circuit;

Fig. 3 is a complete resonant circuit for restoring PDD energy of the present invention;

Fig. 4 is the voltage current waveform of complete resonant circuit for restoring PDD energy of the present invention;

Fig. 5 is the local current waveform of complete resonant circuit for restoring PDD energy of the present invention.

(5) specific implementation method

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:

The technical solution used in the present invention is: 1 usefulness is adjustable, and the low-voltage compensation power supply replaces driving power; 2 are provided with the storage capacitor that additional screen by little current switch control is kept electric current; 3 saltus steps by two-way switch control series resonant tank.

As shown in Figure 3, the C among the present invention ₂Be screen electric capacity, L ₁Be energy recovery resonant inductance, D ₁, D ₂, D ₃, D ₄And T ₃Be combined into two-way switch, C1 is every straight matching capacitance, can regulate rising or falling speed, V by changing matching capacitance only with a resonant inductance in the design of seasoned system ₀Be adjustable low-voltage compensation power supply, T ₁And T ₂Be energy supplement switching tube, C ₃Keep electric current for screen and replenish storage capacitor, T4 keeps electric current replenishment control switching tube for screen.Adjustable low-voltage compensation power supply V ₀Positive pole and energy supplement switch transistor T ₁Drain electrode link to each other negative pole and energy supplement switch transistor T ₂Source electrode link to each other the energy supplement switch transistor T ₁Source electrode and energy supplement switch transistor T ₂Drain electrode link to each other back and D ₁, D ₂, D ₃, D ₄And T ₃Be combined into two-way switch and link to each other, the other end of two-way switch with link to each other every straight matching capacitance C1, every the other end and the energy recovery resonant inductance L of straight matching capacitance C1 ₁Link to each other energy recovery resonant inductance L ₁The other end with the screen capacitor C ₂Link to each other.Shield and have the very little electric current of keeping in the luminous process, the present invention is provided with screen and keeps electric current and replenish storage capacitor C for this reason ₃, link to each other with screen electric capacity by the MOS switching tube.

Power source voltage only need be replenished the voltage attenuation of saltus step process, and for example the Q value in loop is 20, saltus step amplitude 200V, and then power source voltage only is 15V, T ₁And T ₂Operating voltage also only be 15V.The conducting T of elder generation when its course of work is last jumping ₁, conducting D then ₁, D ₂, D ₃, D ₄And T ₃The two-way switch of forming, C ₁, L ₁And C ₂The resonant tank of forming makes voltage V ₃Jump; Work as V ₃Rise to and compare V _SWhen a high economize on electricity was pressed, electric current had been close to 0, at this moment conducting T ₄, the part of electric current provides shields the luminous electric current of keeping, and a part is passed through T ₄To C ₃Charging.When being zero, turn-offs inductive current T ₃, shield and luminous keep electric current by C ₃Pass through T ₄Provide.Turn-off T then ₄That elder generation's conducting is T during following saltus step ₂, conducting D then ₁, D ₂, D ₃, D ₄And T ₃The two-way switch of forming, C ₁, L ₁And C ₂The resonant tank of forming makes voltage V ₃Jumping is fallen, and turn-offs T when inductive current is zero ₃All power device is soft switch.

Claims (5)

1. complete resonant circuit for restoring PDD energy is characterized in that: keep by two-way switch, low-voltage compensation power supply, the first energy supplement switching tube and the second energy supplement switching tube, every straight matching capacitance, energy recovery resonant inductance, screen that electric current replenishes storage capacitor, screen is kept electric current replenishment control switching tube and combined; Described two-way switch is by diode D ₁, D ₂, D ₃, D ₄And switch transistor T ₃Be combined into, the positive pole of D1 links to each other with the negative pole of D2, and the positive pole of D2 links to each other with the source electrode of the positive pole of D4, T3, and the D4 negative pole links to each other with the positive pole of D3, and the negative pole of D3 links to each other with the drain electrode of the negative pole of D1, T3; Described low-voltage compensation power supply V ₀Positive pole and the described first energy supplement switch transistor T ₁Drain electrode link to each other negative pole and the described second energy supplement switch transistor T ₂Source electrode link to each other the described first energy supplement switch transistor T ₁Source electrode and the described second energy supplement switch transistor T ₂The drain electrode back that links to each other link to each other with the positive pole of D1 in the two-way switch, the positive pole of D3 links to each other with a described end every straight matching capacitance C1 in the two-way switch, the described other end and described energy recovery resonant inductance L every straight matching capacitance C1 ₁An end link to each other described energy recovery resonant inductance L ₁The other end with the screen capacitor C ₂An end, the described screen source electrode of keeping electric current replenishment control switch transistor T 4 link to each other, described screen is kept the drain electrode of electric current replenishment control switch transistor T 4 and is kept the additional storage capacitor C of electric current with described screen ₃An end link to each other described screen capacitor C ₂The other end and described screen keep electric current and replenish storage capacitor C ₃The other end link to each other, circuit working is in complete resonant condition.

2. complete resonant circuit for restoring PDD energy according to claim 1 is characterized in that: described low-voltage compensation power supply V ₀Voltage far below the operating voltage of screen and can regulate, adapting to different series loop Q values, the variation of operating voltage requirement and operating voltage.

3. complete resonant circuit for restoring PDD energy according to claim 1, it is characterized in that: describedly form by switchable capacitance group every straight matching capacitance C1, to produce different pulse risings and dropping characteristic requirement, especially be adapted to the aging demand of PDP screen.

4. complete resonant circuit for restoring PDD energy according to claim 1 is characterized in that; Described screen is kept electric current and is replenished storage capacitor C ₃Capacity greater than the screen capacitor C ₂

5. complete resonant circuit for restoring PDD energy according to claim 4 is characterized in that described screen keeps electric current and replenish storage capacitor C ₃Be the screen capacitor C ₂5-10 doubly be best.

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