CN200997572Y - Bridging driver - Google Patents
Bridging driver Download PDFInfo
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- CN200997572Y CN200997572Y CN 200620166358 CN200620166358U CN200997572Y CN 200997572 Y CN200997572 Y CN 200997572Y CN 200620166358 CN200620166358 CN 200620166358 CN 200620166358 U CN200620166358 U CN 200620166358U CN 200997572 Y CN200997572 Y CN 200997572Y
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Abstract
A full-bridge drive unit is connected with a transformer primary side and a DCM and comprises a control chip with two OTs (1,2) putting out control signals (1,2) with the duty ratio less than 50% respectively; the 1st cutoff switch, connected with the 1st OT of the control chip; the 1st diode with the anode connected with the DCM; the 1st resistance connected with the cathode of the 1st diode and the 1st cutoff switch; the 1st capacitance, connected with the cathode of the 1st diode and an end of the transformer primary side; the 1st N-channel field-effect transistor with a brake pole connected with the 1st cutoff switch, the drawing pole connected with the DCM, and the source electrode connected with an end of the transformer primary side; the 2nd N-channel field-effect transistor with the brake pole connected with the 1st OT, the drawing pole connected with the source electrode of the 1st N-channel field-effect transistor, and the source electrode connected with a reference terminal; the 2nd cutoff switch connected with the 2nd OT of the control chip; the 2nd diode with the anode connected with the DCM; the 2nd resistance connected with the cathode of the 2nd diode and the 2nd cutoff switch; the 2nd capacitance connected with the cathode of the 2nd diode and the other end of the transformer primary side; the 3rd N-channel field-effect transistor with the brake pole connected with the 2nd cutoff switch, the drawing pole connected with the DCM, and the source electrode connected with the other end of the transformer primary side; and the 4th N-channel field-effect transistor with the brake pole connected with the 2nd OT, the drawing pole connected with the source electrode of the 3rd N-channel field-effect transistor, and the source electrode connected with the reference terminal.
Description
Technical field
A kind of full-bridge type driver refers to especially a kind ofly can utilize push-pull type control chip control full-bridge current device (Full-Bridge Inverter), and drives the drive unit of load.
Background technology
The supply of electric power of TFT panel backlight (Power Supply) is mainly used converter circuit (Inverter Circuit) to reach the conversion of energy and is driven the luminous of cold cathode ray tube (CCFL).Known 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., for direct current being converted to the converter circuit of alternating current.
Please refer to Fig. 1, drive the circuit diagram of load for known 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 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 known 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 change action 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 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 the chip that LX1686 or O2MICRO company produce, its model is OZ9930, OZ9938, the chip that OZ9939 and TEXAS INSTRUMENTS company produce, its model is TL-494, TL-595, chip with the production of Beyond Innovation Technology company, its model is that row such as BIT3193, BIT3713, BIT3715, BIT3501 can't be given an example one by one because of label is numerous, only enumerates with model commonly used.
Please refer to Fig. 3, be the circuit diagram of known 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 includes: four electronic switches (P1, P2, N1, N2), a full-bridge type control chip 203 and a capacitor C1 etc., secondary side 202 includes: a load (Load).Cooperate Fig. 4, be known 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 are in order to control the change action of P1, P2, N1, four electronic switches of N2 respectively, while is according to the voltage of DC power supply Vcc, in order to providing energy, and the boost in voltage of DC power supply Vcc is transformed into secondary side 202 in order to drive load (Load) by transformer T2 to transformer T2.This full-bridge type control chip 203 is the chip that Beyond Innovation Technology company produces, its model is the chip that BIT3105 or O2MICRO company produce, and its model is series and general commercially available known full-bridge type control chips such as OZ960, OZ964, OZ9925, OZ9910, OZL68, OZ9938, OZ9939.
In the above-mentioned explanation, the control of full-bridge type control chip 203 could be moved if the converter circuit (Inverter Circuit) that uses then needs during as the full-bridge current circuit to arrange in pairs or groups, and the control of push-pull type control chip 103 could be moved if the push-pull type converter circuit then needs to arrange in pairs or groups.Therefore, in practicality, lack flexibility, moreover converter circuit (Inverter Circuit) also often is subject to control chip in using, and causes the converter circuit (Inverter Circuit) can't regular event.
The utility model content
In view of this, the utility model provides a kind of full-bridge type driver, utilizes the push-pull type control chip to drive the device of full-bridge current device.Full-bridge type driver of the present utility model utilizes the drive circuit of two same circuits topology, be connected to two outputs of push-pull type control chip and the gate of the full bridge type switch module that four N channel field effect transistors are formed, these two drive circuits are accepted the control of push-pull type control chip, in order to drive the change action of full bridge type switch module.
In the above-mentioned explanation, two ends and a direct current power supply that the utility model provides a kind of full-bridge type driver to be connected in a transformer primary side, full-bridge type driver includes: one is provided with the push-pull type control chip of one first output and one second output, and this push-pull type control chip output duty cycle is less than 50% one first control signal and one second control signal; One first cutoff switch is coupled to first output of this push-pull type control chip; One first diode, its anode is coupled to this DC power supply; One first resistance is coupled to negative electrode and this first cutoff switch of this first diode; One first electric capacity is coupled to the negative electrode of this first diode and an end of this transformer primary side; One the one N channel field effect transistor, its gate is coupled to this first cutoff switch, and drain is coupled to this DC power supply, and source electrode is coupled to an end of this transformer primary side; One the 2nd N channel field effect transistor, its gate is coupled to this first output, and drain is coupled to the source electrode of a N channel field effect transistor, and source electrode is couple to a reference edge; One second cutoff switch is coupled to second output of this push-pull type control chip; One second diode, its anode is coupled to this DC power supply; One second resistance is coupled to negative electrode and this second cutoff switch of this second diode; One second electric capacity is coupled to the negative electrode of this second diode and the other end of this transformer primary side; One the 3rd N channel field effect transistor, its gate is coupled to the negative electrode of this second cutoff switch, and drain is coupled to this DC power supply, and source electrode is coupled to the other end of this transformer primary side; And one the 4th N channel field effect transistor, its gate is coupled to this second output, and drain is coupled to the source electrode of the 3rd N channel field effect transistor, and source electrode is couple to this reference edge.
The utility model also provides a kind of full-bridge type driver, is connected in two ends and a direct current power supply of a transformer primary side, includes: a control chip, and output duty cycle is less than 50% one first control signal and one second control signal; One the one N channel field effect transistor is coupled to an end of this DC power supply and this transformer primary side; One the 2nd N channel field effect transistor is coupled to a N channel field effect transistor, this control chip and a reference edge; One first cutoff switch is coupled to this control chip and a N channel field effect transistor, and this cutoff switch is according to this first control signal, by a N channel field effect transistor; One first charge path is coupled to this DC power supply and the 2nd N channel field effect transistor; One first discharge path is coupled between the lock-source electrode of a N channel field effect transistor; One the 3rd N channel field effect transistor is coupled to the other end of this DC power supply and this transformer primary side; One the 4th N channel field effect transistor is coupled to the 3rd N channel field effect transistor, this control chip and this reference edge; One second cutoff switch is coupled to this control chip and the 3rd N channel field effect transistor, and this cutoff switch is according to this second control signal, by the 3rd N channel field effect transistor; One second charge path is coupled to this DC power supply and the 4th N channel field effect transistor; And one second discharge path, be coupled between the lock-source electrode of the 3rd N channel field effect transistor.
So, a kind of full-bridge type driver of the utility model utilizes two drive circuits of push-pull type control chip collocation in order to control the action of known full-bridge current circuit.The dealer only need use not only may command push-pull type converter circuit of push-pull type control chip, and two simple drive circuit of further can arranging in pairs or groups make can control the full-bridge current circuit, has more elasticity in the practicality.
Above general introduction and ensuing detailed description are all exemplary in nature, are in order to further specify protection range of the present utility model.And about other purpose of the present utility model and advantage, will be set forth with follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the circuit diagram that known push-pull type converter circuit drives load;
Fig. 2 is known push-pull type control chip output control signal and load end output voltage waveforms schematic diagram;
Fig. 3 is the circuit diagram of known full-bridge current drives load;
Fig. 4 is known full-bridge type control chip output control signal schematic diagram;
Fig. 5 is the circuit diagram of the full-bridge type driver of the utility model first embodiment;
Push-pull type control chip output signal and AC supply voltage waveform schematic diagram that Fig. 6 uses for the utility model; And
Fig. 7 is the circuit diagram of the full-bridge type driver of the utility model second embodiment.
The primary clustering description of reference numerals
Known:
The late-class circuit of front stage circuits 102 secondary sides of 101 primary sides
103 push-pull type control chip T1 transformers
The a first control signal b second control signal
The secondary side output voltage waveforms of c transformer T1
The front stage circuits of 201 primary sides
The late-class circuit of 202 secondary sides
203 full-bridge type control chip T2 transformers
POUT1, POUT2, NOUT1, NOUT2 control signal
The utility model:
103 push-pull type control chips, 30 first drive circuits
302 first buffer circuits, 32 second drive circuits
322 second buffer circuits, 34 full bridge type switch module
RL load TX transformer
AC AC power Vcc DC power supply
324 secondary signal amplifying units, 304 first signal amplification units
Embodiment
Please refer to Fig. 5, be the circuit diagram of the full-bridge type driver of the utility model first embodiment.Full-bridge type driver wherein of the present utility model is connected in two ends of a transformer TX primary side, and in order to a direct current power Vcc is converted into an AC power AC, this AC power AC provides load RL action required energy by transformer TX.Multiple with reference to figure 5, full-bridge type driver of the present utility model includes: a push-pull type control chip 103, one first drive circuit 30, one second drive circuit 32 and a full bridge type switch module 34.
Push-pull type control chip 103 is provided with one first output terminals A and one second output B, this first output terminals A and this second output B respectively output duty cycle less than 50% one first control signal a and one second control signal b.Full bridge type switch module 34 includes four N channel 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, in order to this DC power supply Vcc is switched to two ends that this AC power AC is sent to this transformer TX primary side.
Multiple with reference to figure 5, this first drive circuit 30 includes: one first cutoff switch Q5, one first diode D1, one first resistance R 1, one first capacitor C 1 and one first buffer circuit 302.The first cutoff switch Q5 is a BJT transistor, and its base stage is coupled to first output terminals A of this push-pull type control chip 103, and emitter-base bandgap grading is coupled to reference edge G, and the collection utmost point 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 an optical coupling switch.First capacitor C 1 is coupled to the negative electrode of this first diode D1 and an end of this transformer TX primary side.First buffer circuit 302 is coupled to the 2nd N channel 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 one first quickens diode D2 and one the 3rd resistance R 3, first negative pole (N) end that quickens diode D2 couples first output terminals A of this push-pull type control chip 103, and anodal (P) end is couple to the gate of the 2nd N channel 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 same as first drive circuit 30, includes with reference to figure 5, the second drive circuits 32: one second cutoff switch Q6, one second diode D3, one second resistance R 4, one second capacitor C 2 and one second buffer circuit 322.The second cutoff switch Q6 is a BJT transistor, and its base stage is coupled to the second output B of this push-pull type control chip 103, and emitter-base bandgap grading is coupled to reference edge G, and the collection utmost point is coupled to an end of second resistance R 4.The second cutoff switch Q6 also can be an 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 the negative electrode of this second diode D3 and an end of this transformer TX primary side.Second buffer circuit 322 is coupled to the 4th N channel field effect transistor Q4 of this second output B and this full bridge type switch module 34, wherein second buffer circuit 322 comprises that one second quickens diode D4 and one the 4th resistance R 6, second negative pole (N) end that quickens diode D4 couples the second output B of this push-pull type control chip 103, and anodal (P) end is couple to the gate of the 4th N channel 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 provides a positive direct-current power supply+Vcc to this transformer TX via the conducting of a N channel field effect transistor Q1 and the 4th N channel field effect transistor Q4, drives to form a positive half cycle.The conducting of the 2nd N channel field effect transistor Q2 and the 3rd N channel field effect transistor Q3 provides a negative DC power supply-Vcc to this transformer TX, drives to form a negative half period.
Cooperate Fig. 5, please refer to Fig. 6, Fig. 6 is push-pull type control chip output signal of the present utility model and AC supply voltage waveform schematic diagram.Push-pull type control chip 103 is the chip that LINFINITY (MICROSEMI) company produces, and its model is the chip that LX1686 or O2MICRO company produce, and its model is that OZ9RR, OZ9936, OZ9932, OZ9930 are 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, can obtain the voltage waveform ac of AC power AC in transformer TX primary side.
The composite Fig. 5 that closes, with reference to figure 6, when time t1-t2, the first control signal a is a high potential, the second control signal b is an electronegative potential.The first control signal a is sent to the gate of the 2nd N channel field effect transistor Q2 by the 3rd resistance R 3, controls the 2nd N channel field effect transistor Q2 conducting (ON).The first control signal a is sent to the control end of the first cutoff switch Q5 simultaneously, in order to control the first cutoff switch Q5 conducting (ON).The first cutoff switch Q5 of conducting moves the gate of a N channel field effect transistor Q1 to reference edge G, so a N channel field effect transistor Q1 is for ending (OFF) state.At this moment, along with the conducting of the 2nd N channel 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 a positive electricity and is pressed on first capacitor C 1.
In addition, the second control signal b of electronegative potential is sent to the gate of the 4th N channel field effect transistor Q4 by the 4th resistance R 6, controls the 4th N channel field effect transistor Q4 by (OFF).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 by (OFF).Because second capacitor C 2 has established a positive voltage in last cycling.So, be based upon the positive voltage of second capacitor C 2 this moment, by second resistance R 4 across between lock-source electrode of the 3rd N channel field effect transistor Q3 to form a discharge path, enter conducting (ON) state to drive the 3rd N channel field effect transistor Q3.
So when time t1-t2, the 2nd N channel field effect transistor Q2 and the 3rd N channel field effect transistor Q3 are conducting (ON) state, a N channel field effect transistor Q1 and the 4th N channel 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 channel field effect transistor Q2 and the 3rd N channel field effect transistor Q3, and transmit its energy to the primary side of transformer TX, therefore, the voltage waveform ac that this moment, transformer TX primary side obtained is negative DC power supply one Vcc.
The composite Fig. 5 that closes, with reference to figure 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 channel 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, across between lock-source electrode of a N channel field effect transistor Q1, enter conducting (ON) state to drive a N channel field effect transistor Q1 by first resistance R 1.
And because the second control signal b still remains electronegative potential, so the 3rd N channel field effect transistor Q3 still is conducting (ON) state, the 4th N channel field effect transistor Q4 is still for ending (OFF) state.
By in the above-mentioned explanation as can be known, when time t2-t3, the one N channel field effect transistor Q1 and the 3rd N channel field effect transistor Q3 are conducting (ON) state, and the 2nd N channel field effect transistor Q2 and the 4th N channel field effect transistor Q4 are for ending (OFF) state, at this moment, the primary side of transformer TX forms short circuit, and the feasible energy that is stored in the transformer TX is let out to be removed, can state for letting out.Therefore, the voltage waveform ac that this moment, transformer TX primary side obtained is a zero potential.
The composite Fig. 5 that closes, with reference to figure 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 gate of the 4th N channel field effect transistor Q4 by second resistance R 6, controls the 4th N channel 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 gate of the 3rd N channel field effect transistor Q3 to reference edge G, so the 3rd N channel field effect transistor Q3 is for ending (OFF) state.At this moment, along with the conducting of the 4th N channel 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 a positive electricity and is pressed on second capacitor C 2.
And because the first control signal a still remains electronegative potential, so a N channel field effect transistor Q1 still is conducting (ON) state, the 2nd N channel field effect transistor Q2 is still for ending (OFF) state.
So when time t3-t4, the 2nd N channel field effect transistor Q2 and the 3rd N channel field effect transistor Q3 are for ending (OFF) state, a N channel field effect transistor Q1 and the 4th N channel field effect transistor Q4 are conducting (ON) state.At this moment, DC power supply Vcc can be via the conducting (ON) of a N channel field effect transistor Q1 and the 4th N channel field effect transistor Q4, and transmit its energy to the primary side of transformer TX, therefore, the voltage waveform ac that this moment, transformer TX primary side obtained is positive direct-current power supply+Vcc.
The composite Fig. 5 that closes, with reference to figure 6, when time t4-t5, the first control signal a still is an electronegative potential, the second control signal b drops to electronegative potential by high potential.At this moment, the 4th N channel 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, by second resistance R 4 across between lock-source electrode of the 3rd N channel field effect transistor Q3 to form a discharge path, enter 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 channel field effect transistor Q1 still is conducting (ON) state, the 2nd N channel field effect transistor Q2 is still for ending (OFF) state.
By in the above-mentioned explanation as can be known, when time t4-t5, the one N channel field effect transistor Q1 and the 3rd N channel field effect transistor Q3 are conducting (ON) state, and the 2nd N channel field effect transistor Q2 and the 4th N channel field effect transistor Q4 are for ending (OFF) state, at this moment, the primary side of transformer TX forms short circuit, and the feasible energy that is stored in the transformer TX is let out to be removed, can state for letting out.Therefore, the voltage waveform ac that this moment, transformer TX primary side obtained is a zero potential.
The composite Fig. 5 that closes, with reference to figure 6, the voltage waveform ac that the circuit operation of the utility model full-bridge type driver and transformer TX primary side obtain, action and waveform when when time t5-t6, being returned to time t1-t2 again, in regular turn as described above, formation provides the AC power AC of energy, and the peak of AC power AC is the twice of DC power supply Vcc to peak value.Simultaneously, transformer TX with AC power AC boost conversion after, provide energy to load RL from secondary side.
Please refer to Fig. 7, be the circuit diagram of the full-bridge type driver of the utility model second embodiment.The identical person with first embodiment of assembly in the utility model second embodiment indicates with same-sign.The circuit operation principle of second embodiment and first embodiment is identical with the effect of reaching, through relatively down, its main difference be in: second embodiment further comprises one first signal amplification unit 304 and a secondary signal amplifying unit 324.This first signal amplification unit 304 is coupled between a N channel field effect transistor Q1 and this first cutoff switch Q5, and this secondary signal amplifying unit 324 is coupled between the 3rd N channel field effect transistor Q3 and this second cutoff switch Q6.The complementary switch module formed by a NPN transistor Q7 and a PNP transistor Q8 of first signal amplification unit 304, and 324 complementary switch modules of being formed by a NPN transistor Q9 and a PNP transistor Q10 of this secondary signal amplifying unit in addition.
Multiple with reference to figure 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 channel field effect transistor Q1 and enters conducting (ON) state.Anti-, 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 channel field effect transistor Q1 and enters by (OFF) state.According to aforementioned, the operating principle of this secondary signal amplifying unit 324 is same as this first signal amplification unit 304, does not add at this and gives unnecessary details.
In sum, the utility model full-bridge type driver, the drive circuit 30,32 that can connect two same circuits topology promptly can be arranged in pairs or groups and use push-pull type control chip 103 to control in known full-bridge current circuit, have more elasticity in practicality, and can not be subject to control chip.And the dealer only need use push-pull type control chip 103 can decide to select to control push-pull type converter circuit or full-bridge current circuit according to behaviour in service.
But the above only is the detailed description and the accompanying drawing of one of the specific embodiment of the utility model the best, any those skilled in the art in field of the present utility model, can think easily and variation or modify all can be encompassed within the protection range of this case.
Claims (18)
1. a full-bridge type driver is characterized in that, is connected in a transformer primary side and a direct current power supply, includes:
One control chip is provided with one first output and one second output, this first output and this second output respectively output duty cycle less than 50% one first control signal and one second control signal;
One first cutoff switch is coupled to first output of this control chip;
One first diode, its anode is coupled to this DC power supply;
One first resistance is coupled to negative electrode and this first cutoff switch of this first diode;
One first electric capacity is coupled to the negative electrode of this first diode and an end of this transformer primary side;
One the one N channel field effect transistor, the gate of the one N channel field effect transistor is coupled to this first cutoff switch, the drain of the one N channel field effect transistor is coupled to this DC power supply, and the source electrode of a N channel field effect transistor is coupled to an end of this transformer primary side;
One the 2nd N channel field effect transistor, the gate of the 2nd N channel field effect transistor is coupled to this first output, the drain of the 2nd N channel field effect transistor is coupled to the source electrode of a N channel field effect transistor, and the source electrode of the 2nd N channel field effect transistor is couple to a reference edge;
One second cutoff switch is coupled to second output of this control chip;
One second diode, its anode is coupled to this DC power supply;
One second resistance is coupled to negative electrode and this second cutoff switch of this second diode;
One second electric capacity is coupled to the negative electrode of this second diode and the other end of this transformer primary side;
One the 3rd N channel field effect transistor, the gate of the 3rd N channel field effect transistor is coupled to this second cutoff switch, the drain of the 3rd N channel field effect transistor is coupled to this DC power supply, and the source electrode of the 3rd N channel field effect transistor is coupled to the other end of this transformer primary side; And
One the 4th N channel field effect transistor, the gate of the 4th N channel field effect transistor is coupled to this second output, the drain of the 4th N channel field effect transistor is coupled to the source electrode of the 3rd N channel field effect transistor, and the source electrode of the 4th N channel field effect transistor is couple to this reference edge.
2. full-bridge type driver as claimed in claim 1 is characterized in that, this DC power supply provides a positive direct-current power supply to this transformer via the conducting of a N channel field effect transistor and the 4th N channel field effect transistor, drives to form a positive half cycle.
3. full-bridge type driver as claimed in claim 1 is characterized in that, this DC power supply provides a negative DC power supply to this transformer via the conducting of the 2nd N channel field effect transistor and the 3rd N channel field effect transistor, drives to form a negative half period.
4. full-bridge type driver as claimed in claim 1 is characterized in that, further includes one first buffer circuit, and this first buffer circuit includes:
One first quickens diode, and its negative pole end couples first output of this push-pull type control chip, and its positive terminal is couple to the gate of the 2nd N channel field effect transistor; And
One the 3rd resistance, coupled in parallel is in this first acceleration diode.
5. full-bridge type driver as claimed in claim 1 is characterized in that, further includes one second buffer circuit, and this second buffer circuit includes:
One second quickens diode, and its negative pole end is couple to second output of this push-pull type control chip, and its positive terminal couples the gate of the 4th N channel field effect transistor; And
One the 4th resistance, coupled in parallel is quickened diode in the 4th.
6. full-bridge type driver as claimed in claim 1 is characterized in that, this first cutoff switch can be an optical coupling switch.
7. full-bridge type driver as claimed in claim 1 is characterized in that, this second cutoff switch can be an optical coupling switch.
8. full-bridge type driver as claimed in claim 1, it is characterized in that, further comprise one first signal amplification unit and a secondary signal amplifying unit, this first signal amplification unit is coupled between a N channel field effect transistor and this first cutoff switch, and this secondary signal amplifying unit is coupled between the 3rd N channel field effect transistor and this second cutoff switch.
9. full-bridge type driver as claimed in claim 8 is characterized in that, this first signal amplification unit and this secondary signal amplifying unit are respectively a complementary switch module.
10. a full-bridge type driver is characterized in that, is connected in two ends and a direct current power supply of a transformer primary side, includes:
One control chip, output duty cycle is less than 50% one first control signal and one second control signal;
One the one N channel field effect transistor is coupled to an end of this DC power supply and this transformer primary side;
One the 2nd N channel field effect transistor is coupled to a N channel field effect transistor, this control chip and a reference edge;
One first cutoff switch is coupled to this control chip and a N channel field effect transistor, and this cutoff switch is according to this first control signal, by a N channel field effect transistor;
One first charge path is coupled to this DC power supply and the 2nd N channel field effect transistor;
One first discharge path is coupled between the lock-source electrode of a N channel field effect transistor;
One the 3rd N channel field effect transistor is coupled to the other end of this DC power supply and this transformer primary side;
One the 4th N channel field effect transistor is coupled to the 3rd N channel field effect transistor, this control chip and this reference edge;
One second cutoff switch is coupled to this control chip and the 3rd N channel field effect transistor, and this cutoff switch is according to this second control signal, by the 3rd N channel field effect transistor;
One second charge path is coupled to this DC power supply and the 4th N channel field effect transistor; And
One second discharge path is coupled between the lock-source electrode of the 3rd N channel field effect transistor.
11. full-bridge type driver as claimed in claim 10 is characterized in that, this first charge path includes:
One first diode, its anode is coupled to this DC power supply;
One first electric capacity is coupled to the negative electrode and the 2nd N channel field effect transistor of this first diode.
12. full-bridge type driver as claimed in claim 11 is characterized in that, this first discharge path is coupled to this first electric capacity by one first resistance and forms.
13. full-bridge type driver as claimed in claim 10 is characterized in that, this second charge path includes:
One second diode, its anode is coupled to this DC power supply;
One second electric capacity is coupled to the negative electrode and the 4th N channel field effect transistor of this second diode.
14. full-bridge type driver as claimed in claim 13 is characterized in that, this second discharge path is coupled to this second electric capacity by one second resistance and forms.
15. full-bridge type driver as claimed in claim 10 is characterized in that, this first cutoff switch can be an optical coupling switch.
16. full-bridge type driver as claimed in claim 10 is characterized in that, this second cutoff switch can be an optical coupling switch.
17. full-bridge type driver as claimed in claim 10, it is characterized in that, further comprise one first signal amplification unit and a secondary signal amplifying unit, this first signal amplification unit be coupled to a N channel field effect transistor and this first cutoff switch between, this secondary signal amplifying unit is coupled between the 3rd N channel field effect transistor and this second cutoff switch.
18. full-bridge type driver as claimed in claim 17 is characterized in that, this first signal amplification unit and this secondary signal amplifying unit are respectively a complementary switch module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620166358 CN200997572Y (en) | 2006-12-31 | 2006-12-31 | Bridging driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620166358 CN200997572Y (en) | 2006-12-31 | 2006-12-31 | Bridging driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200997572Y true CN200997572Y (en) | 2007-12-26 |
Family
ID=38996007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620166358 Expired - Fee Related CN200997572Y (en) | 2006-12-31 | 2006-12-31 | Bridging driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200997572Y (en) |
-
2006
- 2006-12-31 CN CN 200620166358 patent/CN200997572Y/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071226 Termination date: 20111231 |