CN100533940C - Full-bridge type driver - Google Patents
Full-bridge type driver Download PDFInfo
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- CN100533940C CN100533940C CNB2006101720787A CN200610172078A CN100533940C CN 100533940 C CN100533940 C CN 100533940C CN B2006101720787 A CNB2006101720787 A CN B2006101720787A CN 200610172078 A CN200610172078 A CN 200610172078A CN 100533940 C CN100533940 C CN 100533940C
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Abstract
The invention relates to a driving device of full-bridge type, which comprises a control chip which outputs a first control signal and a second control signal, and a switch component of full-bridge type which comprises a first, a second, a third and a fourth transistors with field effect having N channels and which is coupled with a DC power, a primary side of a transformer and two driving circuits. One driving circuit comprises a first cutoff switch which cuts off the first transistor with field effect having N channels according to the first control signal, a first charging path which is coupled with the DC power and the second transistor with field effect having N channels, and a charging path which is coupled between a grid electrode and a source electrode of the first transistor with field effect having N channels. One other driving circuit comprises a second cutoff switch which cuts off the third transistor with field effect having N channels according to the second control signal, a second charging path which is coupled with the DC power and the fourth transistor with field effect having N channels, and a charging path which is coupled between a grid electrode and a source electrode of the third transistor with field effect having N channels.
Description
Technical field
A kind of full-bridge type driver refers in particular to and a kind ofly can utilize the push-pull type control chip to control full-bridge current device (Full-Bridge Inverter) and drive the drive unit of load.
Background technology
The supply of electric power of TFT panel backlight (Power Supply) mainly uses converter circuit (InverterCircuit) to realize the conversion of energy and to drive cold cathode ray tube (CCFL) luminous.Existing converter circuit (Inverter Circuit) is because of the difference of circuit topography, and have general the branch such as semi bridge type inversion circuit, full-bridge current circuit and push-pull type converter circuit etc., all is the converter circuit that direct current is converted to alternating current.
With reference to Fig. 1, drive the circuit diagram of load for existing push-pull type converter circuit.Transformer T1 is 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 comprises: DC power supply Vcc, the first switch Q1, second switch Q2 etc., this secondary side 102 comprises: at least one capacitor (C1, C2, C3), load (Load), at least one diode (D1, D2) etc.In addition, 102 of primary side 101 and secondary sides are connected with push-pull type control chip 103.Cooperate Fig. 2, be existing push-pull type control chip output signal and load end output waveform schematic diagram.The push-pull type control chip 103 output first control signal a and the 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 change action of second switch Q2 respectively, while is according to the voltage of DC power supply Vcc, in order to provide energy and thus transformer T1 the boost in voltage of DC power supply Vcc is transformed into secondary side 102, thereby drive load (Load), the secondary side 102 output voltage waveforms c of transformer T1 show the voltage waveform that C is ordered, as shown in Figure 2, secondary side 102 output voltage waveforms c are alternating voltage waveform.
This push-pull type control chip 103 is the chip that LINFINITY (MICROSEMI) company produces in the above-mentioned explanation, its model is LX1686, or the chip of O2MICRO company production, its model is OZ9930,0Z9938,0Z9939 and TEXAS, the chip that INSTRUMENTS company produces, its model is TL-494, TL-595, chip with the production of Beyond Innovation Technology company, its model is series such as BIT3193, BIT3713, BIT3715, BIT3501, can't give an example one by one because of label is numerous, only enumerate with model commonly used.
With reference to Fig. 3, be the circuit diagram of existing full-bridge current drives load.Transformer T2 is divided into the front stage circuits 201 of primary side and the late-class circuit 202 of secondary side with circuit region, primary side 201 comprises: four electronic switches (P1, P2, N1, N2), full-bridge type control chip 203 and capacitor C1 etc., secondary side 202 comprises: load (Load).Cooperate Fig. 4, be existing full-bridge type control chip output control signal schematic diagram.Full-bridge type control chip 203 output POUT1, POUT2, four control signals of NOUT1, NOUT2, thereby control the change action of P1, P2, N1, four electronic switches of N2 respectively, simultaneously the voltage according to DC power supply Vcc provides energy to transformer T2, thereby and by transformer T2 the boost in voltage of DC power supply Vcc is transformed into secondary side 202 and drives loads (Load).This full-bridge type control chip 203 is the chip that Beyond Innovation Technology company produces, its model is BIT3105, or the chip of O2MICRO company production, its model is series such as OZ960, OZ964, OZ9925, OZ9910, OZL68, OZ9938, OZ9939, and general commercially available existing full-bridge type control chip.
In the above-mentioned explanation, when the converter circuit that uses (Inverter Circuit) during as the full-bridge current circuit, the control that then needs to load full-bridge type control chip 203 could be worked, if the control that the push-pull type converter circuit then needs to load push-pull type control chip 103 could be worked.Therefore, lack flexibility in practicality, in addition, converter circuit (Inverter Circuit) also often is subject to control chip in the use, and causes the converter circuit (Inverter Circuit) can't operate as normal.
Summary of the invention
In view of this, the invention provides a kind of full-bridge type driver, is to utilize the push-pull type control chip to drive the device of full-bridge current device.Full-bridge type driver of the present invention utilizes the drive circuit of two same circuits topology, be connected to two outputs of push-pull type control chip and the grid of the full bridge type switch module that four N slot field-effect transistors are formed, these two drive circuits are controlled by the push-pull type control chip, thereby drive the switch operating of full bridge type switch module.
In the above-mentioned explanation, the two ends that full-bridge type driver of the present invention is connected in the transformer primary side are used for DC power supply is converted into AC power, full-bridge type driver comprises: be provided with the push-pull type control chip of first output and second output, this push-pull type control chip output duty cycle is less than 50% first control signal and second control signal; First cutoff switch, its base stage are coupled to first output of this push-pull type control chip, and emitter is coupled to reference edge; First diode, its anode is coupled to this DC power supply; First resistance, it is coupled to the negative electrode of this first diode and the collector electrode of this first cutoff switch; The first electric capacity coupling, it is connected to the negative electrode of this first diode and an end of this transformer primary side; The one N slot field-effect transistor, its grid are coupled to this first cutoff switch, and drain electrode is coupled to this DC power supply, and source electrode is coupled to an end of this transformer primary side; The 2nd N slot field-effect transistor, its grid are coupled to this first output, and drain electrode is coupled to the source electrode of a N slot field-effect transistor, and source electrode is couple to reference edge; Second cutoff switch, its base stage are coupled to second output of this push-pull type control chip, and emitter is coupled to above-mentioned reference edge; Second diode, its anode is coupled to this DC power supply; Second resistance, it is coupled to the negative electrode of this second diode and the collector electrode of this second cutoff switch; Second electric capacity, it is coupled to the negative electrode of this second diode and the other end of this transformer primary side; The 3rd N slot field-effect transistor, its grid is coupled to the negative electrode of this second cutoff switch, and drain electrode is coupled to this DC power supply, and source electrode is coupled to the other end of this transformer primary side; And the 4th N slot field-effect transistor, its grid is coupled to this second output, and drain electrode is coupled to the source electrode of the 3rd N slot field-effect transistor, and source electrode is coupled to this reference edge.
The present invention also provides a kind of full-bridge type driver, is connected in the two ends and the DC power supply of transformer primary side, comprising: the push-pull type control chip, and its output duty cycle is less than 50% first control signal and second control signal; The one N slot field-effect transistor, it is coupled to an end of above-mentioned DC power supply and above-mentioned transformer primary side; The 2nd N slot field-effect transistor, it is coupled to an above-mentioned N channel field effect transistors, above-mentioned push-pull type control chip and a reference edge; First cutoff switch, it is coupled to an above-mentioned push-pull type control chip and an above-mentioned N slot field-effect transistor, and above-mentioned cutoff switch is according to above-mentioned first control signal, by an above-mentioned N slot field-effect transistor; First charge path, it is coupled to above-mentioned DC power supply and above-mentioned the 2nd N slot field-effect transistor; First discharge path, it is coupled between the grid-source electrode of an above-mentioned N slot field-effect transistor; The 3rd N slot field-effect transistor, it is coupled to the other end of above-mentioned DC power supply and above-mentioned transformer primary side; The 4th N slot field-effect transistor, it is coupled to above-mentioned the 3rd N channel field effect transistors, above-mentioned push-pull type control chip and above-mentioned reference edge; Second cutoff switch, it is coupled to above-mentioned push-pull type control chip and above-mentioned the 3rd N slot field-effect transistor, and this cutoff switch is according to above-mentioned second control signal, by above-mentioned the 3rd N slot field-effect transistor; Second charge path, it is coupled to above-mentioned DC power supply and above-mentioned the 4th N slot field-effect transistor; Second discharge path, it is coupled between the grid-source electrode of above-mentioned the 3rd N slot field-effect transistor.
So, full-bridge type driver of the present invention utilizes two drive circuits of push-pull type control chip collocation to control the work of existing full-bridge current circuit.The technical staff only need use the push-pull type control chip, may command push-pull type converter circuit not only, thus two simple drive circuit of further can arranging in pairs or groups can be controlled the full-bridge current circuit, have more flexibility on using.
Above general introduction and ensuing detailed description are all exemplary in nature, all are in order to further specify claim scope of the present invention.And about other purpose of the present invention and advantage, will in follow-up explanation and diagram, be set forth.
Description of drawings
Fig. 1 drives the circuit diagram of load for existing push-pull type converter circuit.
Fig. 2 is existing push-pull type control chip output control signal and load end output voltage waveforms schematic diagram.
Fig. 3 is the circuit diagram of existing full-bridge current drives load.
Fig. 4 is existing full-bridge type control chip output control signal schematic diagram.
Fig. 5 is the circuit diagram of the full-bridge type driver of first embodiment of the invention.
Push-pull type control chip output signal and AC supply voltage waveform schematic diagram that Fig. 6 uses for the present invention.
Fig. 7 is the circuit diagram of the full-bridge type driver of second embodiment of the invention.
Embodiment
With reference to Fig. 5, be the circuit diagram of the full-bridge type driver of first embodiment of the invention.Full-bridge type driver wherein of the present invention is connected in transformer T
XThe two ends of primary side are used for DC power supply Vcc is converted into AC power AC, and this AC power AC is by transformer T
XProvide load RL work required energy.Referring again to Fig. 5, full-bridge type driver of the present invention comprises: push-pull type control chip 103, first drive circuit 30, second drive circuit 32 and full bridge type switch module 34.
Push-pull type control chip 103 is provided with first output terminals A and the second output B, this first output terminals A and this second output B respectively output duty cycle less than 50% the first control signal a and the second control signal b.Full bridge type switch module 34 comprises four N slot field-effect transistors (Q1, Q2, Q3, Q4).
This full bridge type switch module 34 is controlled by this first drive circuit 30 and this second drive circuit 32, thereby this DC power supply Vcc is switched to this AC power AC and is sent to this transformer T
XThe two ends of primary side.
Referring again to Fig. 5, this first drive circuit 30 comprises: the first cutoff switch Q5, the first diode D1, first resistance R 1, first capacitor C 1 and first buffer circuit 302.The first cutoff switch Q5 is the BJT transistor, and its base stage is coupled to first output terminals A of this push-pull type control chip 103, and emitter is coupled to reference edge G, and collector electrode is coupled to an end of first resistance R 1.The anode of the first diode D1 is coupled to this DC power supply Vcc, and negative electrode is coupled to the other end of first resistance R 1.The first cutoff switch Q5 also can be the optical coupling switch.First capacitor C 1 is coupled to negative electrode and this transformer T of this first diode D1
XOne end of primary side.First buffer circuit 302 is coupled to the 2nd N slot field-effect transistor Q2 of this first output terminals A and this full bridge type switch module 34, wherein first buffer circuit 302 comprises that first quickens diode D2 and the 3rd resistance R 3, first negative electrode (N) end that quickens diode D2 is couple to first output terminals A of this push-pull type control chip 103, and anode (P) end is couple to the grid of the 2nd N slot field-effect transistor Q2.The 3rd resistance R 3 coupled in parallel are in this first acceleration diode D2.
In addition, the circuit topography of second drive circuit 32 is identical with first drive circuit 30, and with reference to Fig. 5, second drive circuit 32 comprises: the second cutoff switch Q6, the second diode D3, second resistance R 4, second capacitor C 2 and second buffer circuit 322.The second cutoff switch Q6 is the BJT transistor, and its base stage is coupled to the second output B of this push-pull type control chip 103, and emitter is coupled to reference edge G, and collector electrode is coupled to an end of second resistance R 4.The second cutoff switch Q6 also can be the optical coupling switch.The anode of the second diode D3 is coupled to this DC power supply Vcc, and negative electrode is coupled to the other end of second resistance R 4.Second capacitor C 2 is coupled to negative electrode and this transformer T of this second diode D3
XOne end of primary side.Second buffer circuit 322 is coupled to the 4th N slot field-effect transistor Q4 of this second output B and this full bridge type switch module 34, wherein second buffer circuit 322 comprises that second quickens diode D4 and the 4th resistance R 6, second negative electrode (N) end that quickens diode D4 is couple to the second output B of this push-pull type control chip 103, and anode (P) end is couple to the grid of the 4th N slot field-effect transistor Q4.The 4th resistance R 6 coupled in parallel are in this second acceleration diode D4.
In above-mentioned, this DC power supply Vcc is via a N slot field-effect transistor Q1 and the 4th N slot field-effect transistor Q4 conducting, thereby provides positive direct-current power supply+Vcc to this transformer T
XThereby, form positive half cycle and drive.The conducting of the 2nd N slot field-effect transistor Q2 and the 3rd N slot field-effect transistor Q3 provides negative DC power supply-Vcc to give this transformer T
XThereby, form negative half period and drive.
Cooperate Fig. 5, with reference to Fig. 6, Fig. 6 is push-pull type control chip output signal of the present invention and AC supply voltage waveform schematic diagram.Push-pull type control chip 103 is the chip that LINFINITY (MICROSEMI) company produces, its model is LX1686, or the chip of O2MICRO company production, its model is OZ9RR, OZ9936, OZ9932, OZ9930, is general commercially available push-pull type control chip.As shown in Figure 6, push-pull type control chip 103 output terminals A are exported this first control signal a, and output B exports this second control signal b.And, at transformer T
XPrimary side can obtain the voltage waveform ac of AC power AC.
Cooperate Fig. 5 once more, with reference to Fig. 6, 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 grid of the 2nd N slot field-effect transistor Q2 by the 3rd resistance R 3, thereby controls the 2nd N slot field-effect transistor Q2 conducting (ON).The first control signal a is sent to the control end of the first cutoff switch Q5 simultaneously, is used to control the first cutoff switch Q5 conducting (ON).The first cutoff switch Q5 of conducting moves the grid of a N slot field-effect transistor Q1 to reference edge G, so a N slot field-effect transistor Q1 is for ending (OFF) state.At this moment, along with the conducting of the 2nd N slot field-effect transistor Q2, DC power supply Vcc can pass through the first diode D1 and first capacitor C, 1 formed charge path, sets up positive electricity and is pressed on first capacitor C 1.
In addition, the second control signal b of electronegative potential is sent to the grid of the 4th N slot field-effect transistor Q4 by the 4th resistance R 6, controls the 4th N slot field-effect transistor Q4 by (OFF).The second control signal b is sent to the control end of the second cutoff switch Q6 simultaneously, is used to control the second cutoff switch Q6 by (OFF).Because second capacitor C 2 has established positive voltage in last cycling, so be based upon the positive voltage on second capacitor C 2 this moment, form discharge path between grid-source electrode of the 3rd N slot field-effect transistor Q3 thereby be connected in, drive the 3rd N slot field-effect transistor Q3 and enter conducting (ON) state by second resistance R 4.
Therefore when time t1-t2, the 2nd N slot field-effect transistor Q2 and the 3rd N slot field-effect transistor Q3 are conducting (ON) state, and a N slot field-effect transistor Q1 and the 4th N slot field-effect transistor Q4 are for ending (OFF) state.At this moment, DC power supply Vcc can be via the conducting (ON) of the 2nd N slot field-effect transistor Q2 and the 3rd N slot field-effect transistor Q3, and transmits its energy to transformer T
XPrimary side, therefore, this moment transformer T
XThe voltage waveform ac that primary side obtains is negative DC power supply-Vcc.
Cooperate Fig. 5 once more, with reference to Fig. 6, when time t2-t3, the first control signal a drops to electronegative potential from high potential, and the second control signal b still remains electronegative potential.At this moment, the 2nd N slot field-effect transistor Q2 quickens diode D2 by first and quickens to enter by (OFF) state, and the first cutoff switch Q5 enters equally by (OFF) state.Be based upon the positive voltage of first capacitor C 1 this moment, imposes on by first resistance R 1 between grid-source electrode of a N slot field-effect transistor Q1, enters conducting (ON) state thereby drive a N channel field-effect transistor Q1.
And because the second control signal b still remains electronegative potential, so the 3rd N slot field-effect transistor Q3 still is conducting (ON) state, the 4th N slot field-effect transistor Q4 is still for ending (OFF) state.
By in the above-mentioned explanation as can be known, when time t2-t3, a N slot field-effect transistor Q1 and the 3rd N slot field-effect transistor Q3 are conducting (ON) state, and the 2nd N slot field-effect transistor Q2 and the 4th N slot field-effect transistor Q4 are for ending (OFF) state, at this moment, transformer T
XPrimary side form short circuit, make to be stored in transformer T
XInterior energy is let out to be removed, can state for letting out.Therefore, this moment transformer T
XThe voltage waveform ac that primary side obtains is a zero potential.
Cooperate Fig. 5 once more, with reference to Fig. 6, when time t3-t4, the first control signal a still keeps electronegative potential, and the second control signal b rises to high potential by electronegative potential.The second control signal b is sent to the grid of the 4th N slot field-effect transistor Q4 by second resistance R 6, controls the 4th N slot field-effect transistor Q4 conducting (ON).The second control signal b is sent to the control end of the second cutoff switch Q6 simultaneously, in order to control the second cutoff switch Q6 conducting (ON).
The second cutoff switch Q6 of conducting moves the grid of the 3rd N slot field-effect transistor Q3 to reference edge G, so the 3rd N slot field-effect transistor Q3 is for ending (OFF) state.At this moment, along with the conducting of the 4th N slot field-effect transistor Q4, DC power supply Vcc can pass through the second diode D3 and second capacitor C, 2 formed charge paths, sets up positive electricity and is pressed on second capacitor C 2.
And because the first control signal a still remains electronegative potential, so a N slot field-effect transistor Q1 still is conducting (ON) state, the 2nd N slot field-effect transistor Q2 is still for ending (OFF) state.
So when time t3-t4, the 2nd N slot field-effect transistor Q2 and the 3rd N slot field-effect transistor Q3 are for ending (OFF) state, a N slot field-effect transistor Q1 and the 4th N slot field-effect transistor Q4 are conducting (ON) state.At this moment, DC power supply Vcc can be via the conducting (ON) of a N slot field-effect transistor Q1 and the 4th N slot field-effect transistor Q4, and transmits its energy to transformer T
XPrimary side, therefore, this moment transformer T
XThe voltage waveform ac that primary side obtains is positive direct-current power supply+Vcc.
Cooperate Fig. 5 once more, with reference to Fig. 6, when time t4-t5, the first control signal a still is an electronegative potential, and the second control signal b drops to electronegative potential by high potential.At this moment, the 4th N slot field-effect transistor Q4 quickens diode D4 by second and quickens to enter by (OFF) state, and the second cutoff switch Q6 enters equally by (OFF) state.Be based upon the positive voltage of second capacitor C 2 this moment, is connected in by second resistance R 4 between grid-source electrode of the 3rd N slot field-effect transistor Q3, thereby forms discharge path, enters conducting (ON) state to drive the 3rd N channel field-effect transistor Q3.
And because the first control signal a still remains electronegative potential, so a N slot field-effect transistor Q1 still is conducting (ON) state, the 2nd N slot field-effect transistor Q2 is still for ending (OFF) state.
As shown in the above description, when time t4-t5, a N slot field-effect transistor Q1 and the 3rd N slot field-effect transistor Q3 are conducting (ON) state, and the 2nd N slot field-effect transistor Q2 and the 4th N slot field-effect transistor Q4 are for ending (OFF) state, at this moment, transformer T
XPrimary side form short circuit, make to be stored in transformer T
XInterior energy is let out to be removed, can state for letting out.Therefore, this moment transformer T
XThe voltage waveform ac that primary side obtains is a zero potential.
Cooperate Fig. 5 once more, with reference to Fig. 6, the circuit working of full-bridge type driver of the present invention and transformer T
XThe voltage waveform ac that primary side obtains, action and waveform when being returned to time t1-t2 again when time t5-t6 as described above, form the AC power AC that energy is provided, and the peak of AC power AC is the twice of DC power supply Vcc to peak value.Simultaneously, transformer T
XAfter AC power AC boost conversion, provide energy to load RL from secondary side.
With reference to Fig. 7, be the circuit diagram of the full-bridge type driver of second embodiment of the invention.The element in second embodiment of the invention and the first embodiment components identical indicate with same-sign.The circuit working principle of second embodiment and first embodiment is identical with the effect of reaching, through relatively, its main difference be in: second embodiment further comprises first signal amplification unit 304 and secondary signal amplifying unit 324.This first signal amplification unit 304 is coupled between a N slot field-effect transistor Q1 and this first cutoff switch Q5, and this secondary signal amplifying unit 324 is coupled between the 3rd N slot field-effect transistor Q3 and this second cutoff switch Q6.The complementary switch module of the complementary switch module of first signal amplification unit 304 for being formed, and this secondary signal amplifying unit 324 in addition for being formed by NPN transistor Q9 and PNP transistor Q10 by NPN transistor Q7 and PNP transistor Q8.
Referring again to Fig. 7, when the first cutoff switch Q5 ended (OFF), NPN transistor Q7 ended (OFF) synchronously, the synchronous conducting of PNP transistor Q8 (ON), and the PNP transistor Q8 of conducting controls a N slot field-effect transistor Q1 and enters conducting (ON) state.On the contrary, when the first cutoff switch Q5 conducting (ON), the synchronous conducting of NPN transistor Q7 (ON), PNP transistor Q8 is synchronously by (OFF), and the NPN transistor Q7 of conducting controls a N slot field-effect transistor Q1 and enters by (OFF) state.According to aforementioned, the operation principle of this secondary signal amplifying unit 324 is identical with this first signal amplification unit 304, does not add at this and gives unnecessary details.
In sum, full-bridge type driver of the present invention, the drive circuit 30,32 that can connect two same circuits topology is in existing full-bridge current circuit, not only can arrange in pairs or groups and use push-pull type control chip 103 to control, on using, have more flexibility, and can not be subject to control chip.And those of ordinary skills only need use push-pull type control chip 103 just can select to control push-pull type converter circuit or full-bridge current circuit according to behaviour in service.
Yet above-mentioned only is the detailed description and the diagram of a specific embodiment of the best of the present invention, and any personnel that are familiar with this technology are in the field of the invention, and the variation that can expect easily or modification all can be covered by in the claim of this case.
Claims (18)
1. a full-bridge type driver is characterized in that, is connected in the two ends of transformer primary side, is used for DC power supply is converted into AC power, comprising:
The push-pull type control chip, it is provided with first output and second output, this first output and above-mentioned second output respectively output duty cycle less than 50% first control signal and second control signal;
First cutoff switch, its base stage are coupled to first output of above-mentioned push-pull type control chip, and emitter is coupled to reference edge;
First diode, its anode is coupled to above-mentioned DC power supply;
First resistance, it is coupled to the negative electrode of above-mentioned first diode and the collector electrode of above-mentioned first cutoff switch;
First electric capacity, it is coupled to the negative electrode of above-mentioned first diode and an end of above-mentioned transformer primary side;
The one N slot field-effect transistor, its grid are coupled to above-mentioned first cutoff switch, and drain electrode is coupled to above-mentioned DC power supply, and source electrode is coupled to an end of above-mentioned transformer primary side;
The 2nd N slot field-effect transistor, its grid are coupled to above-mentioned first output, and drain electrode is coupled to the source electrode of an above-mentioned N slot field-effect transistor, and source electrode is coupled to a reference edge;
Second cutoff switch, its base stage are coupled to second output of above-mentioned push-pull type control chip, and emitter is coupled to above-mentioned reference edge;
Second diode, its anode is coupled to above-mentioned DC power supply;
Second resistance, it is coupled to the negative electrode of above-mentioned second diode and the collector electrode of above-mentioned second cutoff switch;
Second electric capacity, it is coupled to the negative electrode of above-mentioned second diode and the other end of above-mentioned transformer primary side;
The 3rd N slot field-effect transistor, its grid are coupled to above-mentioned second cutoff switch, and drain electrode is coupled to above-mentioned DC power supply, and source electrode is coupled to the other end of above-mentioned transformer primary side; And
The 4th N slot field-effect transistor, its grid are coupled to above-mentioned second output, and drain electrode is coupled to the source electrode of above-mentioned the 3rd N slot field-effect transistor, and source electrode is coupled to above-mentioned reference edge.
2. full-bridge type driver as claimed in claim 1, it is characterized in that, above-mentioned DC power supply provides the positive direct-current power supply to above-mentioned transformer via the conducting of a N slot field-effect transistor and above-mentioned the 4th N slot field-effect transistor, drives thereby form positive half cycle.
3. full-bridge type driver as claimed in claim 1, it is characterized in that, above-mentioned DC power supply provides negative DC power supply to above-mentioned transformer via the conducting of the 2nd N slot field-effect transistor and above-mentioned the 3rd N slot field-effect transistor, drives thereby form negative half period.
4. full-bridge type driver as claimed in claim 1 is characterized in that, further comprises first buffer circuit, and this first buffer circuit comprises:
First quickens diode, and its negative electrode (N) end is coupled to first output of above-mentioned push-pull type control chip, and anode (P) end is coupled to the grid of above-mentioned the 2nd N slot field-effect transistor; And
The 3rd resistance, its coupled in parallel is quickened diode in above-mentioned first.
5. full-bridge type driver as claimed in claim 1 is characterized in that, further comprises second buffer circuit, and this second buffer circuit comprises:
Second quickens diode, and its negative electrode (N) end is coupled to second output of above-mentioned push-pull type control chip, and its anode (P) end is coupled to the grid of above-mentioned the 4th N slot field-effect transistor; And
The 4th resistance, its coupled in parallel is quickened diode in the above-mentioned the 4th.
6. full-bridge type driver as claimed in claim 1 is characterized in that, above-mentioned first cutoff switch can be the optical coupling switch.
7. full-bridge type driver as claimed in claim 1 is characterized in that, above-mentioned second cutoff switch can be the optical coupling switch.
8. full-bridge type driver as claimed in claim 1, it is characterized in that, further comprise first signal amplification unit and secondary signal amplifying unit, this first signal amplification unit is coupled between an above-mentioned N slot field-effect transistor and above-mentioned first cutoff switch, and this secondary signal amplifying unit is coupled between above-mentioned the 3rd N slot field-effect transistor and above-mentioned second cutoff switch.
9. full-bridge type driver as claimed in claim 8 is characterized in that, above-mentioned first signal amplification unit and above-mentioned secondary signal amplifying unit are respectively complementary switch module.
10. a full-bridge type driver is characterized in that, is connected in the two ends of transformer primary side, is used for DC power supply is converted into AC power, comprising:
The push-pull type control chip, its output duty cycle is less than 50% first control signal and second control signal;
The one N slot field-effect transistor, it is coupled to an end of above-mentioned DC power supply and above-mentioned transformer primary side;
The 2nd N slot field-effect transistor, it is coupled to an above-mentioned N channel field effect transistors, above-mentioned push-pull type control chip and a reference edge;
First cutoff switch, it is coupled to an above-mentioned push-pull type control chip and an above-mentioned N slot field-effect transistor, and above-mentioned first cutoff switch is according to above-mentioned first control signal, by an above-mentioned N slot field-effect transistor;
First charge path, it is coupled to above-mentioned DC power supply and above-mentioned the 2nd N slot field-effect transistor;
First discharge path, it is coupled between the grid-source electrode of an above-mentioned N slot field-effect transistor;
The 3rd N slot field-effect transistor, it is coupled to the other end of above-mentioned DC power supply and above-mentioned transformer primary side;
The 4th N slot field-effect transistor, it is coupled to above-mentioned the 3rd N channel field effect transistors, above-mentioned push-pull type control chip and above-mentioned reference edge;
Second cutoff switch, it is coupled to above-mentioned push-pull type control chip and above-mentioned the 3rd N slot field-effect transistor, and this second cutoff switch is according to above-mentioned second control signal, by above-mentioned the 3rd N slot field-effect transistor;
Second charge path, it is coupled to above-mentioned DC power supply and above-mentioned the 4th N slot field-effect transistor;
Second discharge path, it is coupled between the grid-source electrode of above-mentioned the 3rd N slot field-effect transistor.
11. full-bridge type driver as claimed in claim 10 is characterized in that, above-mentioned first charge path comprises:
First diode, its anode is coupled to above-mentioned DC power supply;
First electric capacity, it is coupled to the negative electrode and above-mentioned the 2nd N slot field-effect transistor of above-mentioned first diode.
12. full-bridge type driver as claimed in claim 11 is characterized in that, above-mentioned first discharge path is coupled to above-mentioned first electric capacity by first resistance and forms.
13. full-bridge type driver as claimed in claim 10 is characterized in that, above-mentioned second charge path comprises:
Second diode, its anode is coupled to above-mentioned DC power supply;
Second electric capacity, it is coupled to the negative electrode and above-mentioned the 4th N slot field-effect transistor of above-mentioned second diode.
14. full-bridge type driver as claimed in claim 13 is characterized in that, above-mentioned second discharge path is coupled to above-mentioned second electric capacity by second resistance and forms.
15. full-bridge type driver as claimed in claim 10 is characterized in that, above-mentioned first cutoff switch can be the optical coupling switch.
16. full-bridge type driver as claimed in claim 10 is characterized in that, above-mentioned second cutoff switch can be the optical coupling switch.
17. full-bridge type driver as claimed in claim 10, it is characterized in that, further comprise first signal amplification unit and secondary signal amplifying unit, this first signal amplification unit is coupled between an above-mentioned N slot field-effect transistor and above-mentioned first cutoff switch, and this secondary signal amplifying unit is coupled between above-mentioned the 3rd N slot field-effect transistor and above-mentioned second cutoff switch.
18. full-bridge type driver as claimed in claim 17 is characterized in that, above-mentioned first signal amplification unit and above-mentioned secondary signal amplifying unit are respectively complementary switch module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101720787A CN100533940C (en) | 2006-12-29 | 2006-12-29 | Full-bridge type driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101720787A CN100533940C (en) | 2006-12-29 | 2006-12-29 | Full-bridge type driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101212190A CN101212190A (en) | 2008-07-02 |
| CN100533940C true CN100533940C (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101720787A Expired - Fee Related CN100533940C (en) | 2006-12-29 | 2006-12-29 | Full-bridge type driver |
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| Country | Link |
|---|---|
| CN (1) | CN100533940C (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050107123A (en) * | 2004-05-07 | 2005-11-11 | 리엔 창 일렉트로닉 | Full bridge inverter with push/pull control chip |
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- 2006-12-29 CN CNB2006101720787A patent/CN100533940C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050107123A (en) * | 2004-05-07 | 2005-11-11 | 리엔 창 일렉트로닉 | Full bridge inverter with push/pull control chip |
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| Publication number | Publication date |
|---|---|
| CN101212190A (en) | 2008-07-02 |
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