CN201444393U - Parallel-series resonant type energy recovery circuit - Google Patents

Abstract

The utility model relates to a multi-stage resonant type energy recovery circuit for a plasma panel. In the plasma panel, two or more series resonant circuits are in parallel connection, and each series resonant circuit can control the directions of the connection, the disconnection and the breakover of the circuit through the respective switch thereof. During energy storage, sequential connections are achieved from a series resonant circuit 1 to a series resonant circuit n, and energy on the plasma panel is conveyed to a storage capacitor progressively through resonance; during energy recovery, inverse connections are achieved from the series resonant circuit 1 to the series resonant circuit n, and energy on the storage capacitor is conveyed to the plasma panel. The utility model has the advantages that multi-stage energy storage and energy recovery are adopted, a single high-voltage resonance mode is converted to a multiple low-voltage resonance mode. Therefore, the energy consumption of the plasma panel is reduced obviously, impacts on switching elements during energy storage and recovery process are reduced, and EMI is weakened.

Description

Multiple-series resonant mode energy recovery circuit

(1) technical field

The utility model relates to the energy recovery circuit that a kind of plasma panel PDP drives, and especially a plurality of series resonant tank is together in parallel to realize the circuit that multistage resonant formula plasma panel energy recovers.

(2) background technology

Plasma panel PDP is a kind of capacitive element with stray capacitance, particularly large-sized PDP, and the capacitance of its stray capacitance is quite big.This makes that circuit must provide extra energy that stray capacitance is charged when the PDP driving circuit that adopts the square wave form applied high pressure to the electrode that shields body at every turn; In the time of will shielding body ground connection, circuit must discharge the remaining electric energy on the stray capacitance at every turn.Each charge and discharge process has Vss ²/ 2 energy is consumed in the driving element and line impedance of circuit, and wherein Vss represents to keep power source voltage.This extra energy consumption is directly proportional with the frequency of square wave driving signal, when frequency higher (more than tens kHz), will increase the power consumption of driving circuit greatly.The notion of utilizing the LC resonant tank to realize that PDP screen energy recovers thus is suggested, and is applied to the PDP driving circuit.U.S. Pat 4866349, US4924218 and US5081400 disclose a kind of PDP energy recovery circuit, its problem is, the square wave driving signal of PDP requires to have precipitous edge (usually in 0.3～2.4 microsecond), when the capacitive of PDP screen body is strong, according to the series resonance principle, must use the very little inductance element of inductance value, and such inductance element energy storage capacity is low, this just make energy from storage capacitor when screen electric capacity shifts, have only the sub-fraction energy to shift with resonance manner by the pure inductance element, most of energy then is to shift in the disresonance mode by the dead resistance on the inductance element; Energy is from shielding the situation of electric capacity when storage capacitor shifts all fours with it.Because existing mode adopts the single resonance manner, energy rejuvenation finishes and energy supplement switch still during access failure, be added in voltage on the PDP electrode much smaller than keeping supply voltage Vss, like this when the energy supplement switch connection, keeping power supply still needs to replenish more energy to screen body stray capacitance, has strengthened the energy consumption of energy supplement switch; When the store energy process finishes and grounding switch still during access failure, be added in voltage on the PDP electrode much larger than ground voltage, when grounding switch was connected like this, remaining energy was still more on the screen body stray capacitance, and this part energy will consume on grounding switch and resonant tank.Though therefore how sort circuit still exists very big space to be improved than charging and discharging circuit has firmly had bigger improvement completely aspect soft switch performance.

(3) utility model content

The purpose of this utility model is to provide a kind of can effectively improve the effect that energy recovers, and reduces the energy supplement switch and the suffered impact of grounding switch of plasma panel driving circuit, reduces a kind of plasma panel energy recovery circuit of EMI.

Implementation of the present utility model is: 1, energy recovery resonant tank is made up of two or more series resonant tank, is preferably 2-3 series resonant tank, and these series resonant tank are connected in parallel.Each series resonant tank is made of separately storage capacitor Cn, inductance L n and the switch transistor T Hn1 and the THn2 of the connection of may command loop, disconnection and conducting direction; 2. these series resonant tank can be used independent inductance element separately, also can a shared inductance element; 3. each series resonant tank has two-way switch separately; 4. when realizing store energy, series resonant tank 1 connects in turn to series resonant tank n, the energy on the plasma panel Cp is sent to step by step on the storage capacitor of series resonant tank by resonance; When realizing that energy recovers, series resonant tank 1 to series resonant tank n backward is connected, and by resonance the energy on the storage capacitor Cn is sent on the plasma panel Cp step by step.

The drain electrode of energy supplement switch T1 with keep power supply and be connected, the source electrode of T1 is connected with the drain electrode of grounding switch T2, the source ground of T2, switch transistor T H11, switch transistor T H12, storage capacitor C1 and inductance L 1 constitute series resonant tank 1, and wherein TH11 and TH12 adopt back-to-back mode to form two-way switch; Switch transistor T H21, switch transistor T H22, storage capacitor C2 and inductance L 2 constitute series resonant tank 2, and wherein TH21 and TH22 adopt back-to-back mode to form two-way switch; By that analogy, switch transistor T Hn1, switch transistor T Hn2, storage capacitor Cn and inductance L n constitute series resonant tank n, and wherein THn1 and THn2 adopt back-to-back mode to form two-way switch.The source electrode of T1 and the drain electrode of T2, with L1, L2 ..., Ln links to each other, and links to each other with plasma panel Cp.

Advantage of the present utility model is effectively to improve the effect that energy recovers, and reduces the energy supplement switch and the suffered impact of grounding switch of plasma panel driving circuit, the energy that makes circuitry consumes still less, and EMI is also littler.

(4) description of drawings

Fig. 1 is existing energy recovery circuit figure;

Fig. 2 is plasma panel energy recovery circuit figure of the present utility model;

Fig. 3 is an embodiment circuit diagram of the present utility model;

(5) embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:

This circuit is: 1. with the (series resonant tank 1 of the series resonant tank more than 2 or 2, series resonant tank 2, series resonant tank 3 ... series resonant tank n) be connected in parallel, wherein each series resonant tank can be by its connection of switch controlled, disconnection and conducting direction separately; 2. each series resonant tank can be used independent inductance element separately, also can shared same inductance element; 3. under the control of control element able to programme, when carrying out store energy, series resonant tank 13 to series resonant tank n connects in turn to series resonant tank 2 to series resonant tank, the energy on the plasma panel Cp is sent to step by step on the storage capacitor Cn of series resonant tank by resonance; When carrying out the energy recovery, series resonant tank 1 to series resonant tank n backward is connected, and by resonance the energy on the storage capacitor Cn is sent on the plasma panel Cp step by step.

Be illustrated in figure 3 as and two series resonant tank (series resonant tank 1, series resonant tank 2) be together in parallel the example of the multiple-series resonant plasma display screen energy recovery circuit of composition.Vss is that to keep supply voltage, T1 be that energy supplement switch, T2 are that grounding switch, Cp are that plasma panel, L1 and L2 are that two-way switch, the C1 that resonant inductance, switch transistor T H11 and switch transistor T H12 form series resonant tank 1 is the storage capacitor of series resonant tank 1, and two-way switch, C2 that switch transistor T H21 and switch transistor T H22 form series resonant tank 2 are the storage capacitor of series resonant tank 2.C1＞＞Cp and C2＞＞Cp, get usually more than 10 times.All switching tubes maintenance off-states in the circuit under the original state, under the control of control element able to programme, when carrying out store energy, the circuit working process is: 1.TH11 connects, and last minute energy of Cp transferred to C1; 2. close TH11, connect TH21, Cp is gone up energy remaining transfer to C2; 3. close TH21, connect T2.When carrying out the energy recovery, the circuit working process is: 1.TH22 connects, and C2 is gone up energy stored transfer to Cp; 2. close TH22, connect TH12, the energy on the C1 is transferred to Cp; 3. close TH12, connect T1.

Claims (2)

1. multiple-series resonant mode energy recovery circuit, form by resonant tank, it is characterized in that this circuit is that two or more series resonant tank that are made of storage capacitor Cn and inductance L n are connected in parallel, and all be connected with the switch transistor T Hn1 and the THn2 of its connection of may command, disconnection and conducting direction on each series resonant tank.

2. multiple-series resonant mode energy recovery circuit according to claim 1 is characterized in that described circuit is to be connected in parallel by 2-3 series resonant tank.

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