CN100421347C - Semi bridge type inversion circuit for driving dual NMOS by using push-pull control chip - Google Patents
Semi bridge type inversion circuit for driving dual NMOS by using push-pull control chip Download PDFInfo
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- CN100421347C CN100421347C CNB200410071037XA CN200410071037A CN100421347C CN 100421347 C CN100421347 C CN 100421347C CN B200410071037X A CNB200410071037X A CN B200410071037XA CN 200410071037 A CN200410071037 A CN 200410071037A CN 100421347 C CN100421347 C CN 100421347C
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Abstract
The present invention relates to a half bridge current inverting circuit for driving double N-MOS by using a push-pull control chip. A driving circuit can be connected to a common half bridge current inverting circuit, and the half bridge current inverting circuit can be controlled by the push-pull control chip. The present invention comprises the push-pull control chip, the driving circuit and a half bridge switch assembly, wherein the push-pull control chip has two output ends. The driving circuit has two input ends and two output ends, wherein the two input ends are connected to the two output ends of the push-pull control chip and are controlled by the push-pull control chip, and the half bridge switch assembly is composed of a first N channel field effect transistor and a second N channel field effect transistor. Each N channel field effect transistor has a control end connected to the two output ends of the driving circuit, and direct current is switched to be alternating current by the drive of the driving circuit and is transmitted to the primary side end of a transformer.
Description
Technical field
The present invention relates to a kind of semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS, refer to a kind of semi bridge type switch module that can use two N channel fet of push-pull type control to form especially, thereby drive the converter circuit of load.
Background technology
The supply of electric power of TFT panel backlight (Power Supply) is mainly used converter circuit (InverterCircuit) to reach the conversion of energy and is driven the luminous of cathode fluorescent tube (CCFL), common converter circuit (Inverter Circuit) is because of the difference of circuit topology, have general the branch such as semi bridge type inversion circuit, full-bridge current circuit and push-pull type converter circuit etc., for direct current being converted to the converter circuit of alternating current.
Please refer to Fig. 1, drive the circuit diagram of load for common push-pull type converter circuit, two depressor T1 are divided into the front stage circuits 101 of primary side and the late-class circuit 102 of secondary side with circuit region, this primary side 101 includes: a direct current power Vcc, one first switch Q1, a second switch Q2 etc., this secondary side 102 includes: at least one capacitor (C1, C2, C3), a load (Load), at least one diode (D1, D2) etc.Moreover 102 of primary side 101 and secondary sides are connected with a push-pull type control chip 103.Cooperate Fig. 2, be common push-pull type control chip output signal and load end output waveform schematic diagram.Push-pull type control chip 103 output one first control signal a and one second control signal b, wherein the first control signal a and the second control signal b control first switch Q1 of primary side 101 and the switch operating of second switch Q2 respectively, while is according to the voltage of DC power supply Vcc, in order to energy to be provided and the boost in voltage of DC power supply Vcc to be transformed into secondary side 102 by transformer T1, in order to drive load (Load), the secondary side output voltage waveforms c of transformer T1 shows the voltage waveform that C is ordered, as shown in Figure 2, secondary side output voltage waveforms c is an alternating voltage waveform.
This push-pull type control chip 103 is the chip that LINFINITY (MICEOSEMI) company produces in the above-mentioned explanation, its model is series such as LX1686 and LX1691, or be the chip that Micro international Limited produces, its model is series such as 02-9RR, with the chip that Beyond Innovation technology company produces, its model is series such as BIT3494 and BIT3193.
Please refer to Fig. 3, for common semi bridge type inversion circuit drives the load type circuit diagram.Transformer T2 is divided into the preceding polar circuit 201 of primary side and the late-class circuit 202 of secondary side with circuit region, primary side 201 includes: a direct current power Vcc, two electronic switches (Q1, Q2), a semibridge system control chip TL494, two capacitors (C1, C2) and an isolating transformer Tr etc., secondary side 202 includes: a load (Load).Cooperate Fig. 4, be common semibridge system control chip output control signal and AC supply voltage waveform schematic diagram.Semibridge system control chip TK494 by two output D1, D2 output control signal D1-D2 by isolating transformer Tr in order to control the switch operating of Q1, two electronic switches of Q2 respectively.The switch operating of these two electronic switch Q1, Q2 is sent to the primary side end points T21 of transformer T2 with the electric energy that is stored in capacitor C1, C2 respectively by a commissure capacitor C 3, in order to form an AC power ac.The voltage of capacitor C1, C2 is half voltage vcc/2 of DC power supply Vcc.This AC power ac is in order to providing energy to transformer T2, and by transformer T2 with the AC power boost conversion to secondary side 202, in order to drive load (Load).
In the above-mentioned explanation, the control of semibridge system control chip could be worked if the converter circuit (Inverter Circuit) that uses then needs during as semi bridge type inversion circuit to arrange in pairs or groups, and the control of push-pull type control chip could be worked if the push-pull type converter circuit then needs to arrange in pairs or groups.Therefore, in practicality, lack flexibility and shared property.Moreover, converter circuit (Inverter Circuit) also often is subject to control chip in the use, and cause converter circuit (Inverter Circuit) because of being limited by above narration, and make the control chip can't be shared and unifiedly purchase material, the circuit of more complexity that maybe need to arrange in pairs or groups.
Summary of the invention
In view of this, the invention provides a kind of semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS, it utilizes one drive circuit, is connected to the output of push-pull type control chip and the switch operating of the semi bridge type switch module that two N channel fet are formed.
The present invention utilizes the push-pull type control chip to drive the semi bridge type inversion circuit of two N-MOS, and it is connected one drive circuit between two N channel fet of common semi bridge type inversion circuit and the control chip.And it is the push-pull type control chip that control chip substitutes, and then controls the switch operating of these two N channel fet.
The invention provides a kind of semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS, be connected in a side of a transformer,, include in order to a DC power supply is converted to an AC power, a push-pull type control chip is provided with two outputs; A drive circuit, be provided with two inputs and two outputs, these two inputs are connected to two outputs of this push-pull type control chip, accept the control of this push-pull type control chip, this drive circuit includes: a high frequency transformer, it has first input end, second input, first output and second output, this first input end is connected to an output of push-pull type control chip by a RC series circuit simultaneously, and this second input is connected to this reference edge, this first output is connected to the control end of a N channel fet by one first resistance, this second output is connected to a side of this transformer, and one second resistor, be connected in another output of push-pull type control chip and the control end of the 2nd N channel fet; And use a diode to be connected to this second resistor; And semi bridge type switch module, form each N channel fet by one the one N channel fet and one the 2nd N channel fet and all be provided with a control end, and be connected to two outputs of this drive circuit, driving by this drive circuit, in order to this DC power supply is switched to this AC power, and be sent to a side of this transformer.
As described above, a kind of semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS of the present invention, can pass through this drive circuit, in order to receiving the control signal of push-pull type control chip, and then the switch operating of the semi bridge type switch module that two N channel fet are formed in the control semi bridge type inversion circuit.
So, a kind of semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS of the present invention, can connect one drive circuit and promptly can arrange in pairs or groups in common semi bridge type inversion circuit and use the push-pull type control chip to control, in practicality, have more elasticity, and can not be subject to control chip.And the dealer only need use the push-pull type control chip can control push-pull type converter circuit and semi bridge type inversion circuit simultaneously.
See also about detailed description of the present invention and accompanying drawing in order further to understand feature of the present invention and technology contents, however accompanying drawing only provide with reference to and explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 is the circuit diagram that common push-pull type converter circuit drives load;
Fig. 2 is common push-pull type control chip output control signal and load end output voltage waveforms schematic diagram;
Fig. 3 is the circuit diagram that common semi bridge type inversion circuit drives load;
Fig. 4 is common semibridge system control chip output control signal and AC supply voltage waveform schematic diagram;
Fig. 5 is a circuit diagram of the present invention;
Fig. 6 is another circuit diagram of the present invention;
Fig. 7 is the present invention's circuit diagram again;
Fig. 8 is a more circuit diagram of the present invention;
Fig. 9 is the output signal and the AC supply voltage waveform schematic diagram of push-pull type control chip of the present invention.
Wherein, description of reference numerals:
101 front stage circuits, 102 late-class circuits, 103 push-pull type control chips
The T1 transformer
The secondary side output voltage waveforms of a first control signal b second control signal c transformer T1
201 front stage circuits, 202 late-class circuit T2 transformers
TL494 semibridge system control chip
D1-D2 output control signal Q1 control signal Q2 control signal
The ac AC power
103 push-pull type control chips, 302 semi bridge type switch module, 304 drive circuits
T2 transformer Gnd reference edge
The a first control signal b second control signal ac voltage waveform
Embodiment
Please refer to the 5th figure, be circuit diagram of the present invention, wherein the present invention utilizes the push-pull type control chip to drive the semi bridge type inversion circuit of two N-MOS, be connected in the side of a transformer T2, in order to a direct current power Vcc is converted into an AC power AC, AC power AC and by transformer T2 to provide loaded work piece required energy.In the above-mentioned explanation, the peak-to-peak value of this AC power AC is DC power supply Vcc.
With reference to the 5th figure, the present invention utilizes the push-pull type control chip to drive the half-bridge converter circuit of two N-MOS, includes: a push-pull type control chip 103, one drive circuit 304, half bridge switch assembly 302 and two capacitors (C2, C3) again.Wherein, push-pull type control chip 103 is provided with two output terminals A and B, exportable control signal.Drive circuit 304 is provided with two inputs and two outputs, and two output terminals A and B that this two input is connected in this push-pull type control chip 103 accept the control of this push-pull type control chip.Semi bridge type switch module 302, form by two N channel fet Q1, Q2, each N channel fet all is provided with a control end G, those control ends G is connected to two outputs of this drive circuit 304, and the driving by this drive circuit 304 is in order to switch to this DC power supply Vcc the side that this AC power AC is sent to transformer T2.
With reference to the 5th figure, wherein the drain electrode (D) of this two N channel fet Q1, Q2 is connected to side of this transformer T2 again, and individual other source electrode (S) end is connected respectively to a direct current power end Vcc and a reference edge Gnd.Another time side of transformer T2 is connected to reference edge Gnd by capacitor C3, and is connected to DC power supply Vcc by capacitor C2.Simultaneously, the control end G of this two N channel fet Q1, Q2 is connected respectively to the output of drive circuit 304.In the above-mentioned explanation, this two N channel fet Q1, Q2 connect into this semi bridge type switch module 302.And wherein this two N channel fet Q1, Q2 form a positive half cycle driving or a negative half period driving, and this positive half cycle driving and this negative half period drive in the side T21 of transformer T2 and form this AC power AC.
Again with reference to the 5th figure, one drive circuit 304 is used for driving two N channel fet Q1, Q2, this drive circuit 304 is connected to an output terminals A of this push-pull type control chip 103 by a RC series circuit 3040, the other end of this RC series circuit 3040 then is connected to the first input end 1 of a high frequency transformer Tr, one second input 2 of high frequency transformer Tr is connected to this reference edge Gnd, one second input 2 of high frequency transformer Tr is connected to this reference edge Gnd, one first output 3 of high frequency transformer Tr, be connected to the control end G of a N channel fet by one first resistance R 2, one second output 4 of high frequency transformer Tr, be connected to the side T21 of this transformer T2, in above-mentioned, the first input end 1 and first output 3 are same-phase.Simultaneously, first output 3 and second output 4 of high frequency transformer Tr are connected with a damping resistance R4, and this damping resistance R4 is used for preventing the ringing that produced when driving because of transformer Tr, and causes burning of N channel fet Q1.Moreover this drive circuit 304 uses one second resistor R 3 to be connected in another output B of this push-pull type control chip 103 and the control end G of the 2nd N channel fet, and a diode D, is connected to this second resistor R 3.
Please refer to Fig. 6, Fig. 7 and Fig. 8, those circuit diagrams are other embodiments of the invention circuit diagram.The difference of those circuit diagrams and Fig. 5 is in capacitor C2, C3 puts the position.Circuit shown in Figure 6 only uses capacitor C3, and circuit shown in Figure 7 only uses capacitor C2, and circuit shown in Figure 6 uses capacitor C4.In the above-mentioned explanation, capacitor C2, C3 are used for keeping in the electric weight of dc power supply terminal Vcc, and electric weight is provided to transformer T2.Please cooperate Fig. 5,, be the output signal and the AC supply voltage waveform schematic diagram of push-pull type control chip of the present invention with reference to figure 9.As shown in Figure 9, push-pull type control chip 103 output terminals A are exported one first control signal a, output B exports one second control signal b, and as the chip that Beyond Innovation Technology company produces, its model is the POUT1 of series such as BIT3105 and the clock pulse of POUT2.Can obtain the voltage waveform ac of AC power AC in the T21 end points of a side of transformer T2, its peak-to-peak value is DC power supply Vcc.
Cooperate Fig. 5 again, with reference to figure 9, when time t1-t2, the first control signal a is a high potential, and the second control signal b is an electronegative potential.The first control signal a is sent to the first input end 1 of high frequency transformer Tr by RC series circuit 3040, because high frequency transformer Tr polar relationship, make first output, 3 induction outputs, one high potential of high frequency transformer Tr this moment arrive the control end G of a N channel fet Q1, and drive a N channel fet Q1 conducting (ON).The second control signal b is sent to the control end G of the 2nd N channel fet Q2 by this second resistor R 3, in order to control electric crystal switch Q3 by (OFF).At this moment, the one N channel fet Q1 is conducting (ON) state, the 2nd N channel fet Q2 is for ending (OFF) state, make the electric energy be stored in capacitor C2 can be sent to side of transformer T2, and be positive direct-current power supply+Vcc/2 in the available voltage waveform ac of end points T21.In the above-mentioned explanation, this two N channel fet Q1, Q2 are that a positive half cycle drives.
Cooperate Fig. 5 again, with reference to figure 9, when time t2-t3, the first control signal a reduces to electronegative potential by high potential, and the second control signal b still keeps electronegative potential.At this moment, be sent to this high frequency transformer Tr first input end 1 and be electronegative potential, because high frequency transformer Tr polar relationship, make first output, 3 induction outputs, one electronegative potential of high frequency transformer Tr this moment arrive the control end G of a N channel fet Q1, in order to control a N channel fet Q1 by (OFF).By in the above-mentioned explanation as can be known, when time t2-t3, this two N channel fet Q1, Q2 are all by (OFF) state.At this moment, the primary side of transformer T2 forms open circuit, and the feasible energy that is stored in the transformer T2 is let out to be removed, can state for letting out.Therefore, this moment a transformer T2 side the voltage waveform ac that obtains of T21 end points be zero potential.
Cooperate Fig. 5 again, with reference to figure 9, the voltage waveform ac that the T21 end points that the present invention utilizes the push-pull type control chip to drive the semi bridge type inversion circuit work of two N-MOS and a side of transformer T2 obtains, waveform when it is returned to time t1-t2 again when time t5-t6, in regular turn as described above, formation provides the AC power AC of energy, and its peak-to-peak value is DC power supply Vcc.Simultaneously, AC power AC boost conversion is to the secondary side of transformer T2, in order to provide energy to load (Load).
Indulge the above, the present invention utilizes the push-pull type control chip to drive the semi bridge type inversion circuit of two N-MOS, can connect one drive circuit 304 in common semi bridge type inversion circuit, both can arrange in pairs or groups and use push-pull type control chip 103 to control, in practicality, have more elasticity, and can not be subject to control chip.And the dealer only need use push-pull type control chip 103 can control the push-pull type change of current and semi bridge type inversion circuit simultaneously.
The above only is the specific embodiment of the best of the present invention, and feature of the present invention also is regardless of and is limited to this, any those skilled in the art, and conspicuous variation or modification all can be covered by in the claim of the present invention.
Claims (5)
1. semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS is connected in a side of a transformer, in order to a DC power supply is converted to an AC power, includes:
A push-pull type control chip is provided with two outputs;
A drive circuit is provided with two inputs and two outputs, and these two inputs are connected to two outputs of this push-pull type control chip, accept the control of this push-pull type control chip; And
A semi bridge type switch module, form by one the one N channel fet and one the 2nd N channel fet, each N channel fet all is provided with a control end, and be connected to two outputs of this drive circuit, driving by this drive circuit, in order to this DC power supply is switched to this AC power, and be sent to a side of this transformer.
2. the semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS as claimed in claim 1 is characterized in that, these two N channel fet are formed a positive half cycle driving or a negative half period drives.
3. the semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS as claimed in claim 1, it is characterized in that, the drain electrode of the one N channel fet and the 2nd N channel fet is connected to side of this transformer, and the source terminal of these two N channel fet is connected respectively to a dc power supply terminal and a reference edge.
4. the semi bridge type inversion circuit that utilizes the push-pull type control chip to drive two N-MOS as claimed in claim 1 is characterized in that this drive circuit includes:
A high frequency transformer, have first input end, second input, first output and second output, the first input end of high frequency transformer is connected to an output of this push-pull type control chip by a RC series circuit, and second input of high frequency transformer is connected to a reference edge, first output of high frequency transformer, be connected to the control end of a N channel fet by one first resistance, second output of high frequency transformer is connected to a side of this transformer;
One second resistor is connected in another output of this push-pull type control chip and the control end of the 2nd N channel fet;
A damping resistance is connected to first output of high frequency transformer and second output of high frequency transformer;
A diode is connected to this second resistor.
5. the circuit that utilizes the push-pull type control chip to drive the semi-bridge converter device as claimed in claim 4, it is characterized in that, the cathode terminal of this diode is connected to another output of this push-pull type control chip, and anode tap is connected to the control end of the 2nd N channel fet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410071037XA CN100421347C (en) | 2004-07-27 | 2004-07-27 | Semi bridge type inversion circuit for driving dual NMOS by using push-pull control chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410071037XA CN100421347C (en) | 2004-07-27 | 2004-07-27 | Semi bridge type inversion circuit for driving dual NMOS by using push-pull control chip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1728525A CN1728525A (en) | 2006-02-01 |
| CN100421347C true CN100421347C (en) | 2008-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410071037XA Expired - Fee Related CN100421347C (en) | 2004-07-27 | 2004-07-27 | Semi bridge type inversion circuit for driving dual NMOS by using push-pull control chip |
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| CN (1) | CN100421347C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100561846C (en) | 2006-12-22 | 2009-11-18 | 群康科技(深圳)有限公司 | converter circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6317347B1 (en) * | 2000-10-06 | 2001-11-13 | Philips Electronics North America Corporation | Voltage feed push-pull resonant inverter for LCD backlighting |
| JP2002034269A (en) * | 2000-07-14 | 2002-01-31 | Sekisui Chem Co Ltd | Inverter |
| CN1405963A (en) * | 2001-09-20 | 2003-03-26 | 香港大学 | Apparatus for improving stability and dynamic response of semi-bridge convertor |
-
2004
- 2004-07-27 CN CNB200410071037XA patent/CN100421347C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002034269A (en) * | 2000-07-14 | 2002-01-31 | Sekisui Chem Co Ltd | Inverter |
| US6317347B1 (en) * | 2000-10-06 | 2001-11-13 | Philips Electronics North America Corporation | Voltage feed push-pull resonant inverter for LCD backlighting |
| CN1405963A (en) * | 2001-09-20 | 2003-03-26 | 香港大学 | Apparatus for improving stability and dynamic response of semi-bridge convertor |
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| Publication number | Publication date |
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| CN1728525A (en) | 2006-02-01 |
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Granted publication date: 20080924 Termination date: 20100727 |