CN2752898Y - Plasma display plate energy recovery driving device based on double-resonance - Google Patents

Abstract

The energy recovery drive device for plasma display panels based on double resonance, including five groups of MOSFET switch tubes, the drains of the power switch tubes _S1 , _S3 and _S5 are connected to the power supply, the source of _S5 is connected to the external capacitor _Cs One end is connected, the other end of the capacitor C _s is grounded, the inductance L and the capacitor C _p are connected in parallel, and the sources of the power switch tubes S ₁ and S ₃ are respectively connected in series with the two ends of the inductance L and the capacitor C _p and connected to the screen X, The Y electrodes are connected, the drains of the power switch tubes _S4 and _S2 are respectively connected in series with the two ends of the inductor L and the capacitor _Cp , and their sources are grounded. On the one hand, _{the utility model charges the energy of the external capacitor into the inductance through the inductance connected in parallel with the screen capacitance, or charges the external capacitor C s ;} Charge or discharge, so that energy can be recovered.

Description

Energy Recovery Driving Device for Plasma Display Panel Based on Double Resonance

technical field

The utility model relates to an energy recovery driving device, in particular to an energy recovery driving device for a plasma display panel based on double resonance.

Background technique

The display principle of the PDP is to use the ultraviolet light generated by the gas discharge to excite the phosphor to emit light. However, the large power consumption during discharge increases the circuit cost. During the discharge process, the PDP can be equivalent to a capacitor _Cp , whose impedance includes the impedance of the electrode and MOSFET when it is turned on. When the voltage V _s is applied to the screen circuit, its energy loss is 2C _p V _s ² in a single cycle. If its frequency is f, then its energy loss is 2f C _p V _s ² . If the energy recovery device is not used, this part of energy will be wasted. By adopting an energy recovery circuit, this part of energy can be fed back to the screen capacitance, thereby reducing energy loss in the circuit. Generally speaking, the energy recovery device mainly realizes the reduction of energy loss through the energy recovery circuit. The energy recovery circuit currently used has two forms of parallel connection and series connection, but the number of MOSFETs used is large, thereby increasing the cost of the circuit.

Contents of the invention

The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art, and provide a low-cost plasma display panel energy recovery drive device based on double resonance that can reduce the power consumption of the plasma display panel.

In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: comprising power switch tube S ₁ and body diode D ₁ , power switch tube S ₂ and body diode D ₂ , power switch tube S ₃ and body diode D ₃ , power The MOSFET switching tube composed of switching tube _S4 , body diode _D4 and power switching tube _S5 and body diode _D5 is characterized in that: the drains of power switching tubes _S1 , _S3 and _S5 are connected to the power supply, and the power The source of the switch tube _S5 is connected to one end of the external capacitor _Cs , the other end of the capacitor _Cs is grounded, the inductance L and the capacitor _Cp are connected in parallel, and the sources of the power switch tubes _S1 and _S3 are respectively connected in series with the inductance L and the two ends of the capacitor C _p and connected with the X and Y electrodes of the screen, the drains of the power switch tubes _S4 and _S2 are respectively connected in series with the two ends of the inductor L and the capacitor C _p , the source is grounded, and the power switch tube S The gates of ₁ , _S2 , _S3 , _S4 and _S5 are respectively connected to the signal control terminal of the control circuit.

The utility model charges and discharges the external capacitance energy into the inductance through the inductance connected in parallel with the screen capacitance. On the one hand, this inductance is used to generate main resonance with the external capacitor _CS , so that the energy stored in the external capacitor _CS is discharged and stored in the inductor, or the energy in the inductor is charged to the external capacitor _CS . On the other hand, sub-resonance occurs between the inductor L and the screen capacitance C _p , and charges or discharges the screen capacitance, thereby recovering energy.

Description of drawings

Fig. 1 is a schematic circuit diagram of the utility model;

Fig. 2 is a control timing diagram of the utility model power switch tube.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Referring to Fig. 1, the utility model includes power switch tube S ₁ and body diode D ₁ , power switch tube S ₂ and body diode D ₂ , power switch tube S ₃ and body diode D ₃ , power switch tube S ₄ and body diode MOSFET switch tube composed of _D4 , power switch tube _S5 and body diode _D5 , the drains of power switch tubes _S1 , _S3 and _S5 are connected to the power supply, the source of power switch tube _S5 is connected to the external capacitor C One end of _s is connected, the other end of capacitor C _s is grounded, inductance L and capacitor C _p are connected in parallel, and the sources of power switch tubes S ₁ and S ₃ are respectively connected in series with both ends of inductance L and capacitor C _p and connected to the screen The X and Y electrodes are connected, the drains of the power switch tubes S ₄ and S ₂ are respectively connected in series with the two ends of the inductance L and the capacitor C _p , and the sources thereof are grounded, and the power switch tubes S ₁ , S ₂ , S ₃ , S ₄ and The gates of _S5 are respectively connected to the signal control terminals of the control circuit.

The external capacitor _CS of the utility model is connected in series with the external power supply V through the power switch tube _S5 , and is used for storing energy or releasing energy. On the one hand, _the inductance L is used to generate main resonance with the external capacitor C _S , so that the energy stored _{in it} is stored in _the in the inductor L, or store the energy in the inductor L in the external capacitor _CS through the body diode D ₃ in the power switch S ₃ , the body diode D ₄ in the power switch S ₄ , and the power switch S ₅ . The current in the inductor rises linearly with a slope of V _s /L or -V _s /L, and at this time the power switches S ₁ and S ₂ are turned on at zero voltage. On the other hand, sub-resonance occurs between the inductance L and the screen capacitance C _p to charge or discharge the screen capacitance. In this energy recovery device, power switch tubes S ₁ and S ₂ belong to zero-voltage turn-on, power switch tubes S ₃ and S ₄ belong to zero-current turn-off, and power switch tube S ₅ is zero-voltage on and zero-voltage off, namely The switching tubes are all soft-opening tubes, and the power consumption when they are turned on and off is very small, thus greatly reducing the power consumption of the system. Moreover, the energy recovery device is not limited by an external power supply, and can better drive the PDP with the same energy.

Referring to FIG. 2 , the utility model controls the different turn-on sequences of the switch tubes through the control circuit, so as to realize the required driving waveform. At time T0-T1, the power switches S ₁ , S ₂ , and S ₅ are turned on, and the energy stored in C _s is stored in the power switch S ₅ , power switch S ₁ , inductor L, and power switch S ₂ In the inductor L, Vcp keeps Vs(V) constant. At the moment T1-T2, the switch tubes are all disconnected, and the inductor L discharges the capacitor _Cp . When the capacitor voltage Vcp is equal to -Vs, the current in the inductor will continue to pass through the body of the power switch tubes _S3 and _S4 during T2-T4. Diodes D ₃ , D ₄ and power switch tube S ₅ charge the external capacitor C _s . At this time, the screen capacitance C _p has no current, so keep -Vs unchanged. When the inductor current is zero, the power switch tubes S ₃ and S ₄ are closed, which belongs to zero current breaking. The energy stored in the external capacitor _CS is stored in the inductor through the body diode D ₅ , the power switch tubes S ₃ and S ₄ , and the inductor L. The current reverses. Then at time T4-T5, the switch tubes are all disconnected, and the inductor reversely charges the screen capacitance. V _cp is charged to V _s . Thereafter, the current in the inductor L charges the external capacitor through the power switch tubes S ₁ , body diodes D ₁ and D ₂ in S ₂ , the inductor L, and the power switch tube S ₅ .

Claims (1)

1. An energy recovery driving device for a plasma display panel based on double resonance, including a power switch tube S ₁ and a body diode D ₁ , a power switch tube S ₂ and a body diode D ₂ , a power switch tube S ₃ and a body diode D ₃ , The MOSFET switch tube composed of power switch tube _S4 and body diode _D4 and power switch tube _S5 and body diode _D5 is characterized in that: the drains of power switch tubes _S1 , _S3 and _S5 are connected to the power supply, The source of the power switch tube _S5 is connected to one end of the external capacitor _Cs , the other end of the capacitor _Cs is grounded, the inductance L and the capacitor _Cp are connected in parallel, and the sources of the power switch tubes _S1 and _S3 are respectively connected in series with the inductors The two ends of L and capacitor C _p are connected with the X and Y electrodes of the screen, the drains of power switch tubes _S4 and _S2 are respectively connected in series with the two ends of inductor L and capacitor C _p , their sources are grounded, and the power switch tubes The gates of S ₁ , S ₂ , S ₃ , S ₄ and S ₅ are respectively connected to the signal control terminal of the control circuit.

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