CN1750725A - Push-pull type reverse current device circuit - Google Patents
Push-pull type reverse current device circuit Download PDFInfo
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- CN1750725A CN1750725A CN 200410077833 CN200410077833A CN1750725A CN 1750725 A CN1750725 A CN 1750725A CN 200410077833 CN200410077833 CN 200410077833 CN 200410077833 A CN200410077833 A CN 200410077833A CN 1750725 A CN1750725 A CN 1750725A
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Abstract
This invention discloses a push-and-pull type inverter, which contains power output end and two power input ends in transformer unit, a power driving unit connected between power output end and power unit, said power driving unit receiving power signal and outputting two groups of driving with same frequency and opposite phase to voltage transformer unit, and outputting to two power input ends to form a push-and-pull voltage driving signal for driving voltage transformer action in order to raise output power.
Description
Technical field
The present invention relates to a kind of push-pull type reverse current device circuit, particularly a kind of employing push-pull type voltage drive signals drives the voltage transformation unit action, thereby can improve the circuit of inverter of the power output of voltage transformation unit.
Background technology
Present commercially available desktop computer and notebook, the used LCD Panel (LCD) of PDA, Webpad, all be to utilize a kind of drive unit output HIGH voltage, by ceramic transformer lighting cold cathode fluorescent lamp (CCFL), below promptly as follows at drive unit division of the prior art:
Fig. 1 is the general drive unit of CCFL cold cathode fluorescent lamp so that it is lighted that drive, comprise: a power subsystem, one pulse-width modulation (PWM) control unit, one driver element (MOSFET), one piezoelectric ceramic transformer, with a cold cathode fluorescent lamp as load, when starting input voltage, driver element is drive pressure electroceramics transformer action immediately, via contrary/positive transformation effect, drive cold cathode fluorescent lamp, its action is lighted, pulse-width modulation (PWM) control unit is by the tube current of current feedback detecting fluorescent tube, to export a resonance frequency, through the average current of driver element and transformer may command CCFL fluorescent tube.Therefore the light that is produced is projected to backlight display frame.
The power output size of piezoelectric ceramic transformer is to decide according to the input voltage size, when equally loaded cold cathode fluorescent lamp, the length of the fluorescent tube that the power output decision can be lighted, because display screen (especially LCD TV), more and more trend towards the large scale specifications design, cold cathode fluorescent lamp is not if adopt short fluorescent tube interlace mode to arrange, just must adopt long fluorescent tube configuration, but, the required tube current of long fluorescent tube is higher, relative power is also had relatively high expectations, for this reason, the bulletin that the applicant proposes and gets permission is to have disclosed two in " being applied to many groups load driving circuits of the piezoelectric type change-over circuit of long fluorescent tube " of No. 557073 to be connected in parallel and the opposite polarity piezoelectric ceramic transformer of power input end, it is when receiving the voltage drive signals of driver element same phase, to cold cathode fluorescent lamp, it is even to obtain output current by this with the opposite voltage of push pull mode output phase, power output is bigger, and the preferable characteristic of impedance matching.
Though the technical scheme in this patent has solved the power problem of long fluorescent tube, but except length, the fluorescent tube number increases along with the increasing of size, for the technical scheme in this patent, each fluorescent tube all must dispose one group of piezoelectric ceramic transformer, not only cost is higher, and the working temperature of deriving and circuit board volume also can increase thereupon.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the defective that above-mentioned prior art exists, and a kind of push-pull type reverse current device circuit is provided.
For this reason, push-pull type reverse current device circuit according to the present invention is disposed between power subsystem and the load, this circuit of inverter is used to receive the electric power signal of power subsystem input, through the circuit of inverter power conversions to drive load, wherein, circuit of inverter has a voltage transformation unit, voltage transformation unit has power output end and the power input end that connects load, between power output end and power subsystem, be connected with a driven by power unit, the driven by power unit receive electric power signal and to voltage transformation unit export two groups of same frequencys but the drive signal of opposite phase to power input end, constitute the circuit of inverter that a push-pull type voltage drive signals drives the voltage transformation unit action like this.
Can save the configuration of another voltage transformation unit according to push-pull type reverse current device circuit of the present invention, outside cost of manufacture reduces relatively, also can reduce the volume of integrated circuit plate.
Description of drawings
Fig. 1 is the schematic diagram of transformation driving circuit of counterflow device of the prior art.
Fig. 2 is the drive circuit schematic diagram according to first embodiment of the invention.
Fig. 3 is the drive circuit schematic diagram according to second embodiment of the invention.
Fig. 4 is the drive circuit schematic diagram according to third embodiment of the invention.
Embodiment
Relevant detailed description of the present invention and technology contents, existing accompanying drawings is as follows:
See also shown in Figure 2, it is the drive circuit schematic diagram of first embodiment of the invention, as shown in the figure, the present invention receives the electric power signal of power subsystem 10 inputs through resonance transformation rear drive load 15 actions, power subsystem 10 herein is meant the direct current of alternating current through rectification, the electric power signal of this input can be direct current signal through the power factor regulator correction and (mostly is 12V～48V) according to prior art, perhaps be the pulse direct current signal of direct rectification (is 155V according to prior art), this inverter (inverter) circuit arrangement is between power subsystem 10 and load 15, wherein, this circuit of inverter has a voltage transformation unit 14, this voltage transformation unit 14 has the power output end 143 and two power input ends 141 of a connection load 15,142, between this power output end 143 and power subsystem 10, be connected with a driven by power unit, this driven by power unit receives this electric power signal and voltage transformation unit 14 is exported two groups of same frequencys but the drive signal 131 of opposite phase, 132 to this two power input end 141,142, constitute a push-pull type voltage drive signals 131 like this, 132 drive the circuit of inverter of voltage transformation unit 14 actions.
The driven by power unit of first embodiment is by a control unit 11 and two groups of power switch 12a, 12b forms, above-mentioned voltage transformation unit 14 can be Wound-rotor type transformer or piezoelectric transformer, if piezoelectric transformer, then with power switch 12a, dispose inductance 13a between the 12b, 13b, for ease of explaining orally the present invention, below all with the piezoelectric transformer explanation, wherein, this control unit 11 is a pulse-width regulating device (PWM), power switch 12a, 12b then is a power transistor (MOSFET), when power subsystem 10 input circuit signals, power switch 12a, 12b starts immediately, and when control unit 11 receives load 15 feedback resonance frequency signals 151, to export two groups of same frequencys but the drive signal 131 of opposite phase, 132 to power switch 12a, 12b, at this moment, power switch 12a, 12b cuts electric power signal to inductance 13a with the frequency of these control unit 11 outputs, 13b, inductance 13a, 13b is with power switch 12a, the conducting square-wave waveform of 12b is modified to sinusoidal waveform, from figure, can obviously find out, because drive signal 131,132 is opposite, therefore, when the drive signal 131 of anodal power input end 141 of input voltage transformation unit 14 is positive half cycle electric power signal, 132 of the drive signals of the negative pole power input end 142 of voltage transformation unit 14 are the negative half period electric power signal, vice versa, therefore, based on one drive signal 131 is positive string ripple signal, 132 of another drive signals are anti-phase string ripple signal, can produce the push-pull type driven to voltage transformation unit 14 like this, make voltage transformation unit 14 under dual input voltage drives, produce maximum power output and drive load 15 by power output end 143.
See also shown in Figure 3, it is the drive circuit schematic diagram of second embodiment of the invention, as shown in the figure: based on the difference of various control unit 11 designs, if the drive signal of these control unit two groups of same frequencys of 11 outputs and same phase, then between arbitrary power switch 12b and control unit 11, be provided with a waveform inverter 111, when control unit 11 is output as identical non-inverted drive signal, waveform inverter 111 is converted to inverted drive signal with a non-inverted drive signal by this, make the drive signal 131 of input voltage transformation unit, 132 phase places are opposite, can reach the effect identical with first embodiment like this.
See also shown in Figure 4, it is the drive circuit schematic diagram of third embodiment of the invention, as shown in the figure: this driven by power unit is except that the foregoing description, also can form by a string ripple signal generation unit 21 and a signal amplification unit 22, the direct corresponding load 15 feedback resonance frequency signals 151 of string ripple signal generator, with output string wave frequency signal, 22 of signal amplification units receive and are input to voltage transformation unit 14 after this string wave frequency signal gain is amplified, opposite based on phase place, signal amplification unit 22 can be made up of AB class mixed type power amplifier, and its type of drive is same as above.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. push-pull type reverse current device circuit, be disposed between power subsystem (10) and the load (15), described circuit of inverter is used to receive the electric power signal of described power subsystem (10) input,, it is characterized in that to drive described load (15) through the circuit of inverter power conversions:
Described circuit of inverter has a voltage transformation unit (14), described voltage transformation unit (14) has power output end (143) and the power input end (141 that connects described load (15), 142), between described power output end (143) and described power subsystem (10), be connected with a driven by power unit, described driven by power unit receives described electric power signal and described voltage transformation unit (14) is exported two groups of same frequencys but the drive signal (131 of opposite phase, 132), and export described power input end (141 to, 142), constitute a push-pull type voltage drive signals (131 like this, 132) drive the circuit of inverter that described voltage transformation unit (14) is moved.
2. push-pull type reverse current device circuit according to claim 1 is characterized in that, the electric power signal of described power subsystem (10) input is the direct current power signal.
3. push-pull type reverse current device circuit according to claim 1 is characterized in that, the electric power signal of described power subsystem (10) input is the pulse direct current electric power signal.
4. push-pull type reverse current device circuit according to claim 1 is characterized in that, described driven by power unit is made up of a control unit (11) and two groups of power switchs (12a, 12b).
5. push-pull type reverse current device circuit according to claim 4 is characterized in that, described control unit (11) is exported two groups of same frequencys but the drive signal (131,132) of opposite phase.
6. push-pull type reverse current device circuit according to claim 4, it is characterized in that, the drive signal (131,132) of two groups of same frequencys of described control unit (11) output and same phase, and between arbitrary described power switch (12b) and described control unit (11), be provided with a waveform inverter (111).
7. push-pull type reverse current device circuit according to claim 4 is characterized in that, also is provided with inductance (13a, 13b) between described power switch (12a, 12b) and the described voltage transformation unit (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410077833 CN1750725A (en) | 2004-09-15 | 2004-09-15 | Push-pull type reverse current device circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410077833 CN1750725A (en) | 2004-09-15 | 2004-09-15 | Push-pull type reverse current device circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1750725A true CN1750725A (en) | 2006-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410077833 Pending CN1750725A (en) | 2004-09-15 | 2004-09-15 | Push-pull type reverse current device circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1750725A (en) |
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2004
- 2004-09-15 CN CN 200410077833 patent/CN1750725A/en active Pending
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Open date: 20060322 |