CN105119590A - IGBT high efficient drive circuit - Google Patents
IGBT high efficient drive circuit Download PDFInfo
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- CN105119590A CN105119590A CN201510601441.1A CN201510601441A CN105119590A CN 105119590 A CN105119590 A CN 105119590A CN 201510601441 A CN201510601441 A CN 201510601441A CN 105119590 A CN105119590 A CN 105119590A
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Abstract
The invention relates to a drive circuit, an IGBT high efficient drive circuit in particular, which belongs to the technical field of IGBT drive. According to the technical solutions of the invention, the IGBT high efficient drive circuit comprises an IGBT component and a resistor group connected to the gate electrode end of the IGBT component. The resistor group comprises a plurality of drive resistors. The corresponding ends of two adjacent drive resistors in the resistor group are connected through a controllable switch. The other ends of the drive resistors in the resistor group are connected to the gate electrode end of the IGBT component. The control ends of the controllable switches are connected to a switch drive circuit that controls the conducting states of the controllable switches. The switch drive circuit is connected to a current processing and controlling circuit. The current processing and controlling circuit is connected to a current sampling circuit that detects a conducting current flowing through the IGBT component. The drive circuit provided by the invention is simple in structure and is easy to make. With the drive circuit, the service lifetime of the IGBT component can be prolonged and the working efficiency of an IGBT circuit can be increased. The drive circuit achieves safety and reliability.
Description
Technical field
The present invention relates to a kind of drive circuit, especially a kind of IGBT highly efficient driver circuit, belong to the technical field that IGBT drives.
Background technology
For the driving of IGBT, external driving resistance can affect IGBT loss and switching time, reverse-bias safe service area (RBSOA), short circuit current safety operation area (SCSOA), electromagnetic interference (EMI), dv/dt, di/dt etc. parameter.
At present, IGBT drive circuit resistance chosen Fig. 1 and Fig. 2 two kinds of modes, wherein, in Fig. 1, turning on and off of IGBT uses same resistance, the deficiency brought is that when turning off for some frequency applications (as frequency >=20KHz), resistance brings turn-off power loss excessive compared with conference, the problem that device heating amount is large.For above problem, propose the improvement project shown in Fig. 2, when turning on and off, adopt different resistance respectively, can ensure like this rate of change when opening unlikely excessive while also can ensure when turning off low turn-off power loss.
But the occasion that Fig. 1 and Fig. 2 changes greatly for power output (motor as electric automobile drives, photovoltaic generation and wind power generation), general driving resistance is all require that carrying out arranging (is limiting device rate of change according to maximum power, general resistance is larger), but occur in real work that the time of maximum power only accounts for part very little in its actual condition, making low-power export occasion IGBT because driving resistance excessive, not being operated in the decline that its optimum Working causes device temperature rise rising and whole system operating efficiency.In addition, in semiconductor failure analysis theory, when the temperature of power device (IGBT) rise 10 DEG C time, the life-span of device will reduce half.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of IGBT highly efficient driver circuit, its circuit structure is simple, is easy to realize, effectively can extends the useful life of IGBT, improve the operating efficiency of IGBT circuit, safe and reliable.
According to technical scheme provided by the invention, described IGBT highly efficient driver circuit, comprises IGBT device; Also comprise the resistance group being connected to described IGBT device gate pole end, some driving resistance is comprised in described resistance group, in resistance group, the corresponding one end of adjacent driven resistance is all connected by gate-controlled switch, the other end of resistance is driven all to be connected with the gate pole end of IGBT device in resistance group, the control end of gate-controlled switch is all connected with the switch driving circuit for controlling described gate-controlled switch conducting state, described switch driving circuit is connected with current processing control circuit, and current processing control circuit is connected with for detecting the current sampling circuit flowing through IGBT device On current;
The On current gathering IGBT device transfers in current processing control circuit by current sampling circuit, current processing control circuit according to the power output of the On current determination IGBT device of described reception, and exports corresponding switch enable signal according to the power output determined to switch driving circuit; Switch driving circuit receives described switch enable signal, and open drive singal according to described switch enable signal to the gate-controlled switch output of correspondence, to open corresponding gate-controlled switch by opening drive singal, the power output of the resistance value and described IGBT device that make resistance group access IGBT device gate pole end matches.
Described current sampling circuit comprises current sensor or current transformer, and current sampling circuit is arranged on the bus or output line that are connected with IGBT device.
Described resistance group is also connected with driving voltage VDD, and described gate-controlled switch comprises metal-oxide-semiconductor, and source terminal, the drain electrode end of described metal-oxide-semiconductor are connected with adjacent driven resistance respectively, and the gate terminal of metal-oxide-semiconductor is connected with the output of switch driving circuit.
Advantage of the present invention: real-time sampling is carried out to the On current of IGBT device by current sampling circuit, current processing control circuit is according to the power output of On current determination IGBT device, and according to power output to switch driving circuit transmitting switch enable signal, switch driving circuit is determined to access the driving resistance value of IGBT device and the corresponding gate-controlled switch needing conducting according to switch enable signal, thus the power output of the driving resistance value in resistance group and IGBT device can be made to match, can ensure that IGBT device is operated in optimum state, the working temperature of IGBT device can be reduced, promote the operating efficiency of IGBT device place circuit, extend the useful life of IGBT device, also the turn-off power loss of IGBT device can be reduced.
Accompanying drawing explanation
Fig. 1 is that the gate pole end of existing IGBT device connects the schematic diagram driving resistance.
Fig. 2 is that the gate pole end of existing IGBT device connects open resistance simultaneously and closes the schematic diagram of resistance break.
Fig. 3 is structured flowchart of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 3: in order to the useful life of IGBT effectively can be extended, improve the operating efficiency of IGBT circuit, the present invention includes IGBT device; Also comprise the resistance group being connected to described IGBT device gate pole end, some driving resistance is comprised in described resistance group, in resistance group, the corresponding one end of adjacent driven resistance is all connected by gate-controlled switch, the other end of resistance is driven all to be connected with the gate pole end of IGBT device in resistance group, the control end of gate-controlled switch is all connected with the switch driving circuit for controlling described gate-controlled switch conducting state, described switch driving circuit is connected with current processing control circuit, and current processing control circuit is connected with for detecting the current sampling circuit flowing through IGBT device On current;
The On current gathering IGBT device transfers in current processing control circuit by current sampling circuit, current processing control circuit according to the power output of the On current determination IGBT device of described reception, and exports corresponding switch enable signal according to the power output determined to switch driving circuit; Switch driving circuit receives described switch enable signal, and open drive singal according to described switch enable signal to the gate-controlled switch output of correspondence, to open corresponding gate-controlled switch by opening drive singal, the power output of the resistance value and described IGBT device that make resistance group access IGBT device gate pole end matches.
Particularly, some driving resistance is comprised in resistance group, in resistance group adjacent driven resistance one end between gate-controlled switch is set, because the other end of all driving resistance is all connected with the gate pole end of IGBT device, therefore, when switch driving circuit controls gate-controlled switch conducting, then be connected with described gate-controlled switch two drive resistance can form type of attachment parallel with one another, namely when switch driving circuit is by controlling different controlled conducting, resistance value in energy regulating resistance group, can adjust the driving resistance value of IGBT device access.
Current sampling resistor can gather the On current of IGBT device, and current processing control circuit can according to the power output of On current determination IGBT device.In order to the power output of the driving resistance value and IGBT device that make resistance group matches, current processing control circuit output switch enable signal, switch driving circuit determines the gate-controlled switch needing to open according to switch enable signal, after described gate-controlled switch is opened, all driving resistance values of driving resistance formation and the power output of IGBT device in resistance group can be made to match.Usually, the concrete resistance driving resistance in resistance group is all comprised in switch driving circuit, in order to mate with the power output of IGBT device, switch driving circuit can determine the gate-controlled switch that need open after determining to drive resistance value, only need open drive singal to needing the gate-controlled switch of conducting to load.When the power output of IGBT device is large, then the driving resistance value accessing IGBT device gate pole end is also large; When the power output hour of IGBT device, then access the driving resistance value also corresponding reduction of IGBT device gate pole end, drive the concrete match condition of power output of resistance value and IGBT device known by the art personnel, repeat no more herein.When the driving resistance value accessing IGBT device is mated with the power output of IGBT device, can ensure that IGBT device is operated in optimum state, the working temperature of IGBT device can be reduced, promote the operating efficiency of IGBT device place circuit, extend the useful life of IGBT device, also can reduce the turn-off power loss of IGBT device.
Described current sampling circuit comprises current sensor or current transformer, and current sampling circuit is arranged on the bus or output line that are connected with IGBT device.In the specific implementation, current sampling circuit can also adopt other way of realization, as long as can gather the On current of IGBT device.When current sampling circuit is arranged on bus, then direct current can be obtained, and when on the output line that current sampling circuit is arranged on IGBT device, then what obtain is generally alternating current.Illustrated in Fig. 3 that current sampling circuit is arranged on the situation on the output line of IGBT device, sampled point 2 position namely in figure, the position of the sampled point 1 in figure is the bus position connecting IGBT device.In the embodiment of the present invention, current processing control circuit can adopt conventional chip to realize, and corresponding logical circuit also can be adopted to realize, as long as the process that can realize On current output switch enable signal, be specially known by the art personnel, repeat no more herein.
Described resistance group is also connected with driving voltage VDD, and described gate-controlled switch comprises metal-oxide-semiconductor, and source terminal, the drain electrode end of described metal-oxide-semiconductor are connected with adjacent driven resistance respectively, and the gate terminal of metal-oxide-semiconductor is connected with the output of switch driving circuit.
In the embodiment of the present invention, the size of driving voltage VDD can drive the situation of resistance to determine in resistance group, is specially known by the art personnel.In Fig. 3, driving voltage VDD is connected with driving resistance Rgx uppermost in resistance group, one end of resistance Rgx is driven to be connected with the drain electrode end of driving voltage VDD and metal-oxide-semiconductor, the source terminal of metal-oxide-semiconductor drives the driving resistance of resistance Rgx to be connected with next-door neighbour, and in resistance group, other drive the concrete type of attachment of resistance and metal-oxide-semiconductor all similar with the type of attachment of driving resistance Rgx.When only with the metal-oxide-semiconductor conducting driving resistance Rgx to be connected, then the driving resistance Rgx in resistance group and the driving resistor coupled in parallel being close to described driving resistance Rgx, the all-in resistance after described parallel connection is the driving resistance value of access IGBT device.The drive current that driving voltage VDD produces through resistance value of overdriving is as driving the drive singal of IGBT device.
Usually, when metal-oxide-semiconductors all in resistance group is all in off state, then the driving resistance value of IGBT device gate pole end is and drives resistance Rgx.And when there being multiple metal-oxide-semiconductor conducting, then form the type of attachment that multiple driving resistance is in parallel with driving resistance Rgx, thus required driving resistance value can be obtained.During concrete enforcement, the driving resistance in resistance group is precision resister, drives the concrete resistance size of resistance can carry out selection as required and determines, drives resistance can adopt the Low Drift Temperature resistance of HpEvanohm wire rod.When multiple metal-oxide-semiconductor conducting, the metal-oxide-semiconductor being generally positioned at top all needs to carry out conducting, and namely metal-oxide-semiconductor needs conducting from top to bottom, and form the form of ladder, switch driving circuit selects corresponding metal-oxide-semiconductor conducting according to the size of each driving resistance.In addition, metal-oxide-semiconductor should choose the type that internal resistance is large, saturation voltage drop is little, and the low pressure CoolMOS of IR can be adopted to manage.
The present invention carries out real-time sampling by current sampling circuit to the On current of IGBT device, current processing control circuit is according to the power output of On current determination IGBT device, and according to power output to switch driving circuit transmitting switch enable signal, switch driving circuit is determined to access the driving resistance value of IGBT device and the corresponding gate-controlled switch needing conducting according to switch enable signal, thus the power output of the driving resistance value in resistance group and IGBT device can be made to match, can ensure that IGBT device is operated in optimum state, the working temperature of IGBT device can be reduced, promote the operating efficiency of IGBT device place circuit, extend the useful life of IGBT device, also the turn-off power loss of IGBT device can be reduced.
Claims (3)
1. an IGBT highly efficient driver circuit, comprises IGBT device, it is characterized in that: also comprise the resistance group being connected to described IGBT device gate pole end, some driving resistance is comprised in described resistance group, in resistance group, the corresponding one end of adjacent driven resistance is all connected by gate-controlled switch, the other end of resistance is driven all to be connected with the gate pole end of IGBT device in resistance group, the control end of gate-controlled switch is all connected with the switch driving circuit for controlling described gate-controlled switch conducting state, described switch driving circuit is connected with current processing control circuit, current processing control circuit is connected with for detecting the current sampling circuit flowing through IGBT device On current,
The On current gathering IGBT device transfers in current processing control circuit by current sampling circuit, current processing control circuit according to the power output of the On current determination IGBT device of described reception, and exports corresponding switch enable signal according to the power output determined to switch driving circuit; Switch driving circuit receives described switch enable signal, and open drive singal according to described switch enable signal to the gate-controlled switch output of correspondence, to open corresponding gate-controlled switch by opening drive singal, the power output of the resistance value and described IGBT device that make resistance group access IGBT device gate pole end matches.
2. IGBT highly efficient driver circuit according to claim 1, is characterized in that: described current sampling circuit comprises current sensor or current transformer, and current sampling circuit is arranged on the bus or output line that are connected with IGBT device.
3. IGBT highly efficient driver circuit according to claim 1, it is characterized in that: described resistance group is also connected with driving voltage VDD, described gate-controlled switch comprises metal-oxide-semiconductor, source terminal, the drain electrode end of described metal-oxide-semiconductor are connected with adjacent driven resistance respectively, and the gate terminal of metal-oxide-semiconductor is connected with the output of switch driving circuit.
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| CN201510601441.1A CN105119590A (en) | 2015-09-18 | 2015-09-18 | IGBT high efficient drive circuit |
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| CN201510601441.1A CN105119590A (en) | 2015-09-18 | 2015-09-18 | IGBT high efficient drive circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406846A (en) * | 2015-12-10 | 2016-03-16 | 北京卫星制造厂 | Power tube driving control circuit suitable for solid-state power controller |
| CN106936297A (en) * | 2017-05-16 | 2017-07-07 | 重庆大学 | A kind of Automatic adjusument drives the SiC MOSFET drive circuits of resistance |
| CN111817641A (en) * | 2020-06-01 | 2020-10-23 | 上海三菱电机·上菱空调机电器有限公司 | Inverter circuit of variable frequency air conditioner outdoor unit and driving control method of inverter circuit |
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| CN106936297A (en) * | 2017-05-16 | 2017-07-07 | 重庆大学 | A kind of Automatic adjusument drives the SiC MOSFET drive circuits of resistance |
| CN111817641A (en) * | 2020-06-01 | 2020-10-23 | 上海三菱电机·上菱空调机电器有限公司 | Inverter circuit of variable frequency air conditioner outdoor unit and driving control method of inverter circuit |
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