CN103986314B - A kind of trigger control circuit and LLC drive circuits - Google Patents
A kind of trigger control circuit and LLC drive circuits Download PDFInfo
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- CN103986314B CN103986314B CN201410184531.0A CN201410184531A CN103986314B CN 103986314 B CN103986314 B CN 103986314B CN 201410184531 A CN201410184531 A CN 201410184531A CN 103986314 B CN103986314 B CN 103986314B
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- switching tube
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- partial pressure
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Abstract
The present invention relates to a kind of trigger control circuit and LLC drive circuits, belong to power electronics field.Bridge architecture is used in the primary of transformer, each bridge arm includes switching tube and its trigger control circuit, trigger control circuit selection includes at least two derided capacitors and control terminal concatenation forms capacitance partial pressure circuit, control terminal is arranged on bleeder circuit one end, one of derided capacitors are attempted by the triggering end of switching tube to be triggered, for providing trigger voltage to switching tube, the derided capacitors are when control terminal is in different conditions, positive partial pressure and negative sense upset can be realized, so that controlling switch pipe on or off.The circuit structure is simple, can the reliably rapidly conducting and cut-off of controlling switch pipe, strengthen the driving force of LLC.
Description
Technical field
The present invention relates to a kind of trigger control circuit and LLC drive circuits, belong to power electronics field.
Background technology
The drive circuit of LLC generally comprises transformer, primary circuit and secondary circuit, and LLC drives in the prior art
The triode of the primary mostly push-pull configuration of dynamic circuit is amplified, and structure is more complicated.Since drive circuit is to the waveform of MOS
Had a huge impact with spike, and to MOS can Sofe Switch, and in commutation instants, the quality of drive waveforms, directly certainly
Determine the reliability of LLC, and using storage capacitor or two poles mostly are clamped to the trigger circuit of metal-oxide-semiconductor in primary circuit at present
Pipe, as Application No. 200910046491.2 patent document in provide a kind of series circuit of power switch device, the circuit
Using the triggering of clamp diode control metal-oxide-semiconductor, complicated, metal-oxide-semiconductor cannot convert rapidly, so as to can cause LLC reliabilities
Reduce.
The content of the invention
The purpose of the present invention is a kind of trigger control circuit and LLC drive circuits, are answered with solving current driving circuit structure
The insecure problem of miscellaneous and to metal-oxide-semiconductor triggering.
The present invention provides a kind of trigger control circuit to solve above-mentioned technical problem, which includes capacitance
Bleeder circuit, the capacitance partial pressure circuit includes at least two derided capacitors of concatenation and control terminal, control terminal are arranged on
Bleeder circuit one end, one of derided capacitors are attempted by the triggering end of switching tube to be triggered, for providing triggering to switching tube
Voltage.
The derided capacitors both ends for being attempted by switching tube triggering end to be triggered are simultaneously connected to discharge resistance.
The control terminal is pwm pulse controller output end.
Present invention also offers a kind of LLC drive circuits, including transformer and its primary and secondary circuit, the primary
Circuit uses bridge circuit, and each bridge arm of the bridge circuit includes switching tube and its trigger control circuit, triggering control electricity
Road includes capacitance partial pressure circuit, and the capacitance partial pressure circuit includes at least two derided capacitors of concatenation and control terminal, control
Terminal is arranged on bleeder circuit one end, and one of derided capacitors are attempted by the triggering end of switching tube to be triggered, for switch
Pipe provides trigger voltage.
The derided capacitors both ends for being attempted by switching tube triggering end to be triggered are simultaneously connected to discharge resistance.
The switching tube is two metal-oxide-semiconductors in parallel.
Switching tube in the upper bridge is two PNP pipes in parallel, and the switching tube in lower bridge is two NPN in parallel
Pipe.
The control terminal is the output terminal of pwm pulse controller.
The upper and lower bridge arm of the full-bridge circuit shares a control terminal.
The beneficial effects of the invention are as follows：The present invention uses bridge architecture by the primary in transformer, and each bridge arm includes
Switching tube and its trigger control circuit, trigger control circuit selection includes at least two derided capacitors and control terminal concatenation forms
Capacitance partial pressure circuit, control terminal are arranged on bleeder circuit one end, and one of derided capacitors are attempted by switching tube to be triggered
Triggering end, for providing trigger voltage to switching tube, which can realize just when control terminal is in different conditions
Overturn to partial pressure and negative sense, so that controlling switch pipe on or off.The circuit structure is simple, can reliably and rapidly control
The conducting and cut-off of switching tube, strengthen the driving force of LLC.
Brief description of the drawings
Fig. 1 is that the structural diagrams of trigger control circuit embodiment one of the present invention are intended to；
Fig. 2 is the principles simulation figure of trigger control circuit embodiment one of the present invention；
Fig. 3 is the structure diagram of trigger control circuit embodiment two of the present invention；
Fig. 4 is the structure diagram of LLC drive circuits embodiment of the present invention；
Fig. 5 is the structure diagram of full-bridge circuit in LLC drive circuits of the present invention.
Embodiment
The embodiment of the present invention is further described below in conjunction with the accompanying drawings.
A kind of embodiment one of trigger control circuit of the present invention
Trigger control circuit of the present invention includes capacitance partial pressure circuit and discharge resistance, and capacitance partial pressure circuit includes at least two
Derided capacitors and control terminal concatenation form, and control terminal sets bleeder circuit one end, and control terminal is arranged on bleeder circuit one
End, one of derided capacitors are attempted by the triggering end of switching tube to be triggered, for providing trigger voltage, the partial pressure to switching tube
Capacitance when control terminal is in different conditions, can realize positive partial pressure and negative sense upset so that controlling switch pipe conducting or
Cut-off.As shown in Figure 1, switching tube selects PMOS tube, capacitance partial pressure circuit is included successively trigger control circuit in the present embodiment
The power supply VCC of concatenation, the first derided capacitors C2, the second derided capacitors C1, control terminal PWM-IC and ground terminal, power supply VCC
12V is selected, control terminal selects pwm pulse controller, when controller output end output PWM is 1, control terminal PWM-IC's
Current potential is identical with power supply VCC current potentials, is all 12V, and discharge resistance R1 is attempted by the both ends of the first derided capacitors C2, resistance R1 selections
1KM, the first derided capacitors C2 are attempted by between the grid of PMOS tube and source electrode, which can be defeated according to pwm pulse controller
The state of the pwm signal gone out controls the open-minded of PMOS tube.The operation principle of the circuit is as follows：
Assuming that C1=C2, when the pwm pulse signal of PWM controller output is 0, the capacitance partial pressure circuit turn-on in Fig. 1,
Power supply VCC directly charges two derided capacitors C1 and C2, and according to the characteristic of capacitance, capacitance can wait at the beginning of charging
Imitate as short circuit, charging current is very big, can ignore that R1, C1 and C2 are fully charged under the action of power supply VCC, and capacitance is full of at this time
Afterwards, the voltage at two capacitance both ends is equal, i.e. VC1=VC2=VCC/2, and since R1 is attempted by C2 both ends, C2 needs to provide to R1
Energy, causes the voltage on C2 constantly to decline, and the voltage on C2 declines, and having broken will maintain VC1+VC2=12V's in circuit
Balance, for this balance in holding circuit, VCC must continue to charge to C1 and C2, the C2 voltages in whole charging process
Constantly decline, the voltage on C1 constantly raises, and the voltage Va of terminal is equal to the voltage on C1 between two derided capacitors C1 and C2
VC1, C2 realize the positive partial pressure to power supply, and the voltage VC1 on C1 is certainly less than the voltage 12V of power supply VCC, i.e. PMOS tube at this time
Grid voltage Va be less than PMOS tube source voltage, control PMOS tube cut-off.
When the pwm pulse signal of PWM controller output is 1, control terminal and power supply in the capacitance partial pressure circuit in Fig. 1
Current potential on VCC is identical, and it is 0 to make the sum of voltage on C1 and C2, and control terminal discharges capacitance C1 and C2, due to last
Stage, VC1 are more than VC2, then are discharged, be put into when the voltage of C1 is V1, the voltage of C2 at the same time to C1 and C2 by the electric current of PWM
Voltage just stops for-V1, realizes the negative sense upset of C2, the energy in C2 is consumed due to R1 so that the absolute value of the voltage of C2
Decline, in order to which holding circuit balances, voltage must also decline above C1, so PWM may proceed to output current and C1 continued to discharge,
The absolute value of the voltage of C2 constantly reduces, and the pressure drop of C1 also constantly reduces, voltage VC2 of the loading on R1 during this, its
Magnitude of voltage very little, less than the value in last stage, because the stage is discharged 2 capacitances, the comparison of voltage drop is more, at this time,
The grid voltage Va of PMOS tube is more than the source voltage of PMOS tube, control PMOS tube conducting.
Two different conditions of above-mentioned control terminal make that magnitude of voltage of the loading on R1 is different, and C2 discharges R1,
It is different in the next interim voltage of next state, form a dynamic process.By analysis above, VC2 is in two ranks
Section be loaded into voltage above R1 it is the same when, just reach a balance, C1, C2 and Va can be calculated according to the conclusion
Magnitude of voltage, Va voltages are：
Va：=Vcc+Vc2_L
Va：=Vcc+Vc2_H
Wherein Vcc is supply voltage, and wherein Vc2_L is the voltage on C2 when pwm signal is low, and Vc2_H is pwm signal
For it is high when C2 on voltage.
A kind of embodiment two of trigger control circuit of the present invention
Exemplified by trigger control circuit in the present embodiment is as shown in figure 3, the switching tube selected in the present embodiment is NMOS tube,
Capacitance partial pressure circuit include be sequentially connected in series ground terminal, the first derided capacitors C2, the second derided capacitors C1, control terminal PWM-IC and
Ground terminal, when PWM is 1, the current potential of control terminal PWM-IC is 12V, and control terminal is used to control capacitance partial pressure circuit both ends
All one termination 12V power supplys of ground connection or one end ground connection, discharge resistance R1 are attempted by the both ends of the first derided capacitors C2, the first partial pressure electricity
The grid for holding the terminals between C2 and the second derided capacitors C1 and NMOS tube connects, the source electrode of NMOS tube and triggering control electricity
Ground terminal in road is connected, and the state for the pwm signal which can export according to pwm pulse controller realizes derided capacitors
Positive partial pressure and negative sense upset, so as to fulfill the open-minded of control NMOS tube.The operation principle of the circuit is as follows：
Assuming that C1=C2, when the pwm pulse signal of PWM controller output is 1, capacitance partial pressure circuit turn-on, according to electricity
The characteristic of appearance, for capacitance at the beginning of charging, charging current is very big, can ignore R1, C1 and C2 at this time and be carried in control terminal
Fully charged under the action of the 12V voltages of confession, after capacitance is full of, the voltage at two capacitance both ends is equal, i.e. VC1=VC2=6V, by
C2 both ends are attempted by R1, C2 needs to provide energy to R1, causes the voltage on C2 constantly to decline, and the voltage on C2 declines,
The balance of VC1+VC2=12V will be maintained by having broken in circuit, for this balance in holding circuit, it is necessary to C1 and C2 after
Continuous charging, C2 voltages constantly decline in whole charging process, and the voltage on C1 constantly raises, two derided capacitors C1 and C2 it
Between terminal voltage Va be equal on C2 point voltage VC2, and the voltage on C2 point be forward voltage, i.e., the grid of NMOS tube is electric
Va is pressed to be more than the source voltage of PMOS tube, control NMOS tube conducting.
When the pwm pulse signal of PWM controller output is 0, control terminal is grounded in the capacitance partial pressure circuit in Fig. 3,
The sum of voltage on C1 and C2 is 0 at this time, and control terminal discharges capacitance C1 and C2, under the voltage on C1 and C2 is rapid
Drop, when beginning to decline, since the voltage of C1 exceeds C2, then VC2 will necessarily be reduced to negative pressure at this time, it is assumed that be-V1, together
When, VC1 can also drop to V1 rapidly, and the energy in C2 is consumed due to R1 so that the absolute value of the voltage of C2 declines, in order to keep
Circuit balancing, voltage must also decline above C1, and C1 and C2 continue to discharge, but since the current potential ratio of C1 and C2 is relatively low, release
Magnitude of voltage be also voltage limited, that C1 charges in the first stage, exceed the voltage of second stage electric discharge, the voltage of C1 can hold
Height of continuing rising.In the process due to the continuous discharge of C2 so that the voltage on C2 realizes negative sense upset, causes the grid electricity of MOS
Va is pressed to be less than 0, i.e., less than source voltage so that metal-oxide-semiconductor ends.
Two different conditions of above-mentioned control terminal make magnitude of voltage of the loading on R1 different, due to C1 in the first stage
The voltage of charging exceeds the voltage of second stage electric discharge, and the voltage of C1 can continue to raise, and be finally reached the stage of a balance,
When the charging stage, the voltage with discharge regime loading on R1 was consistent, this process can be only achieved the knot of a stable state
Fruit, at this time the voltage of Va be：
Va:=Vcc+Vc2_L
Va:=Vcc+Vc2_H
For wherein Vcc by the voltage that PWM is that 1 control terminal provides, wherein Vc2_L is on C2 when pwm signal is low
Voltage, Vc2_H are the voltage on C2 when pwm signal is high.
A kind of embodiment of LLC drive circuits of the present invention
For the LLC drive circuits of the present invention as shown in figure 4, including transformer T600, the primary of transformer uses full bridge structure,
Secondary is using metal-oxide-semiconductor to the power tube discharge in LLC, and full bridge structure is as shown in figure 5, including upper and lower bridge, the equivalent circuit of upper bridge
As shown in Figure 1, including switching tube and its trigger control circuit, trigger control circuit includes capacitance partial pressure circuit and discharge resistance,
Capacitance partial pressure circuit includes power supply VCC, the first derided capacitors C2, the second derided capacitors C1, the control terminal PWM- being sequentially connected in series
IC and ground terminal, discharge resistance R1 are serially connected in the first derided capacitors C2 both ends, and the first derided capacitors C2 is attempted by PMOS tube
Between grid and source electrode, the equivalent circuit of lower bridge no longer specifically describes as shown in figure 3, its structure and upper bridge are symmetrical here, on
What bridge was selected is PNP pipe that average current is 4A, and what lower bridge was selected is the NPN pipes that average current is 4A.
In order to increase electric current, the switching tube in each bridge arm selects two and the metal-oxide-semiconductor connect, passes through the PWM of control terminal
Signal condition changes, and derided capacitors voltage is realized that negative sense is overturn, so as to control the break-make of metal-oxide-semiconductor, its concrete operating principle is
It is described in detail in a kind of embodiment one and two of trigger control circuit of the present invention, narration is not repeated herein.Make
For the part in full bridge structure, PNP pipe that upper bridge is selected two and connect, what lower bridge was selected is two and the NPN pipes that connect,
Control terminal is pwm pulse controller, and when output terminal output PWM is 1, the current potential of control terminal is identical with power supply potential, on
Lower bridge arm shares a control terminal, and the both ends of each bridge arm discharge resistance also and are connected to what is formed by diode and resistance concatenation
Circuit, in order to reduce driving current, current limiting unit is connected with the output terminal of upper bridge arm, the current limiting unit is by three resistor coupled in parallel
Form.
The operation principle of the LLC drive circuits is as follows：When PWM is high, the lower bridge tube conducting of full-bridge circuit, transformer
Winding bears positive pressure, and Same Name of Ends is just, at this time by driving transformer to power tube current, power tube voltage rapid increase；PWM
For it is low when, the upper bridge tube conducting of drive circuit, transformer disconnects for the first time, and transformer discharges rapidly equivalent to coil, power tube,
When being put into the threshold voltage of metal-oxide-semiconductor, metal-oxide-semiconductor shut-off, before control terminal sends driving, the voltage above power tube
It will be maintained near threshold voltage.
Claims (7)
1. a kind of trigger control circuit, it is characterised in that the trigger control circuit includes capacitance partial pressure circuit, the capacitance point
Volt circuit includes at least two derided capacitors of concatenation and control terminal, control terminal are arranged on bleeder circuit one end, the control
The terminal other end is grounded, and one of derided capacitors are attempted by the triggering end of switching tube to be triggered, is touched for being provided to switching tube
Power generation pressure, the derided capacitors can realize positive partial pressure and negative sense upset, so as to control when control terminal is in different conditions
Switching tube on or off；Another the termination voltage source or ground of the capacitance partial pressure circuit；It is described to be attempted by switching tube to be triggered
The derided capacitors both ends of triggering end are simultaneously connected to discharge resistance.
2. trigger control circuit according to claim 1, it is characterised in that the control terminal controls for pwm pulse
Device lead-out terminal.
3. a kind of LLC drive circuits, including transformer and its primary and secondary circuit, it is characterised in that the primary circuit
Using full-bridge circuit, each bridge arm of the full-bridge circuit includes switching tube and its trigger control circuit, the trigger control circuit bag
Capacitance partial pressure circuit is included, the capacitance partial pressure circuit includes at least two derided capacitors of concatenation and control terminal, control terminal
Bleeder circuit one end, the control terminal other end ground connection are arranged on, one of derided capacitors are attempted by switching tube to be triggered
Triggering end, for giving switching tube to provide trigger voltage, which can realize when control terminal is in different conditions
Positive partial pressure and negative sense upset, so that controlling switch pipe on or off；Another termination voltage source of the capacitance partial pressure circuit
Or ground；The derided capacitors both ends for being attempted by switching tube triggering end to be triggered are simultaneously connected to discharge resistance.
4. LLC drive circuits according to claim 3, it is characterised in that the switching tube is two MOS in parallel
Pipe.
5. LLC drive circuits according to claim 4, it is characterised in that the switching tube in the upper bridge of the full-bridge circuit
For two PNP pipes in parallel, the switching tube in lower bridge is two NPN pipes in parallel.
6. LLC drive circuits according to claim 3, it is characterised in that the control terminal is pwm pulse controller
Output terminal.
7. LLC drive circuits according to claim 3, it is characterised in that the upper and lower bridge arm of the full-bridge circuit shares
One control terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410184531.0A CN103986314B (en) | 2014-04-30 | 2014-04-30 | A kind of trigger control circuit and LLC drive circuits |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410184531.0A CN103986314B (en) | 2014-04-30 | 2014-04-30 | A kind of trigger control circuit and LLC drive circuits |
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| Publication Number | Publication Date |
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| CN103986314A CN103986314A (en) | 2014-08-13 |
| CN103986314B true CN103986314B (en) | 2018-04-24 |
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| CN113571515B (en) | 2020-04-29 | 2024-04-09 | 广东致能科技有限公司 | Driving circuit, driving IC and driving system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009008047A1 (en) * | 2009-02-09 | 2010-08-19 | Siemens Aktiengesellschaft | Upper switchable power semiconductor switch's trigger circuit power supply device for voltage source inverter, has timing relay including positive connection connected to input connection of undervoltage monitoring unit |
| CN201590755U (en) * | 2009-12-17 | 2010-09-22 | 东南大学 | Power MOS transistor grid drive circuit for grid floating and level conversion |
| CN203313043U (en) * | 2013-06-24 | 2013-11-27 | 杨毅 | Negative-voltage drive circuit of high-frequency MOSFET |
-
2014
- 2014-04-30 CN CN201410184531.0A patent/CN103986314B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009008047A1 (en) * | 2009-02-09 | 2010-08-19 | Siemens Aktiengesellschaft | Upper switchable power semiconductor switch's trigger circuit power supply device for voltage source inverter, has timing relay including positive connection connected to input connection of undervoltage monitoring unit |
| CN201590755U (en) * | 2009-12-17 | 2010-09-22 | 东南大学 | Power MOS transistor grid drive circuit for grid floating and level conversion |
| CN203313043U (en) * | 2013-06-24 | 2013-11-27 | 杨毅 | Negative-voltage drive circuit of high-frequency MOSFET |
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| CN103986314A (en) | 2014-08-13 |
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