CN103683863A - Isolation type high-power driving circuit and switch power supply using circuit - Google Patents
Isolation type high-power driving circuit and switch power supply using circuit Download PDFInfo
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- CN103683863A CN103683863A CN201210359067.5A CN201210359067A CN103683863A CN 103683863 A CN103683863 A CN 103683863A CN 201210359067 A CN201210359067 A CN 201210359067A CN 103683863 A CN103683863 A CN 103683863A
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Abstract
The invention discloses an isolation type high-power driving circuit and a switch power supply using the circuit. The isolation type high-power driving circuit comprises an isolation driving transformer, a primary side driving circuit and a secondary side driving circuit. The primary side driving circuit is used for generating and sending a pulse width signal to the isolation driving transformer. The isolation driving transformer is used for isolating the pulse width signal and then acquiring an isolation signal and transmitting the isolation signal to the secondary side driving circuit. The secondary side driving circuit is used for driving and amplifying the isolation signal by adopting a driving chip so that a driving signal with driving capacity is acquired to drive a power switch tube. With application of the isolation type high-power driving circuit, the driving capacity can be enhanced and driving of one or multiple parallel-connected high-power switch tubes is facilitated. Therefore, when the power switch tube isolation driving circuit outputs the maximum driving capacity in operation, the isolation driving transformer with smaller size can be selected so that cost of the switch power supply is substantially reduced.
Description
Technical field
The present invention relates to isolated high-power drive circuit technical field, relate in particular to a kind of a kind of isolated high-power drive circuit being formed by driving chip and isolation drive transformer and the Switching Power Supply of applying this circuit.
Background technology
Along with the development of power electronic technology, Switching Power Supply is more and more applied.In Switching Power Supply, various circuit topologies all need to be undertaken by power device the transmission of energy, can to power device, drive in mode directly or indirectly.When power switch pipe is applied to bridge type topology or needs isolated controlling, need to carry out isolation drive to described power switch pipe.The mode of isolation drive has multiple topology, as shown in Figure 1, is a kind of traditional power switch pipe isolated drive circuit, and this circuit comprises: former limit drive signal circuit, former limit capacitance C1, isolation drive transformer T1, driving resistance R 1, power switch pipe Q1.Described former limit drive signal circuit is sent the pulsewidth waveform signal of different duty and frequency, former and deputy limit through isolation drive transformer T1 produces and has the driving signal of driving force after isolating, amplifying, then after the resistance R 1 of overdriving, power switch pipe Q1 is driven.
In existing traditional power switch pipe isolated drive circuit scheme, the driving force that the square wave pulse width signal sending due to described control circuit is exported after isolation drive transformer T1 is less, can only the less power switch pipe of driving power, and larger through the output drive waveforms distortion of isolation drive transformer; When the former limit of driving transformer change in duty cycle is larger, secondary output drives the positive and negative amplitude of pulsewidth to change too greatly, may cause circuit working undesired.In addition, when described power switch pipe isolated drive circuit is operated in output maximum drive ability, will inevitably isolating transformer be designed to large-size because drive current increases, this can reduce the power density of product, increases cost.
Summary of the invention
The embodiment of the present invention provides a kind of isolated high-power drive circuit and has applied the Switching Power Supply of this circuit, and for achieving the above object, embodiments of the invention adopt following technical scheme:
An isolated high-power drive circuit, this circuit comprises: isolation drive transformer, former limit drive circuit, secondary drive circuit;
Described former limit drive circuit, for generation of and send pulse width signal to described isolation drive transformer;
Described isolation drive transformer, for described pulse width signal is carried out to isolation processing, obtains isolation signals; And described isolation signals is passed to described secondary drive circuit;
Described secondary drive circuit, for increasing the driving force of described isolation signals, driving power switching tube.
A Switching Power Supply, this power supply comprises: isolated high-power drive circuit as above.
A kind of isolated high-power drive circuit that the embodiment of the present invention provides and apply the Switching Power Supply of this circuit, produces and sends pulse width signal to described isolation drive transformer by described former limit drive signal circuit; By described isolation drive transformer, described pulse width signal is carried out to isolation processing, obtain isolation signals; And described isolation signals is passed to described secondary drive circuit; Described secondary drive circuit strengthens the driving force of described isolation signals, driving power switching tube.The isolated high-power drive circuit that the embodiment of the present invention provides, because having adopted the driving chip that strengthens described isolation signals driving force, secondary drive circuit meets the required driving force of power switch pipe, thereby make power switch pipe when isolated drive circuit is operated in output maximum drive ability, also can select the isolating transformer of small volume, thereby greatly reduce the cost of Switching Power Supply, the secondary drive circuit of isolation drive transformer adopts and drives chip to strengthen the driving force that drives signal simultaneously, sort circuit topology is applicable to the occasion that change in duty cycle is not surveyed or signal frequency also changes.
Described isolation drive transformer is very less than can accomplish by the driving transformer volume of the direct driving power pipe of isolating transformer in the past, takies PCB space very little; More in the past than the high speed photo coupling isolation drive chip adopting, occupying in price larger advantage, and signal transmission postpones little; This isolated high-power drive circuit structure can be according to the power tube quantity of the practical application driving chips of flexibly selecting have different driving ability different from parameter value.
Accompanying drawing explanation
Fig. 1 is a kind of traditional power switch pipe isolated drive circuit figure;
Fig. 2 is the structural representation of a kind of isolated high-power drive circuit of the present invention;
A kind of isolated high-power drive circuit schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The isolated high-power drive circuit schematic diagram of a kind of modified model that Fig. 4 provides for the embodiment of the present invention;
A kind of positive activation type isolation high-power driving circuit theory diagrams that Fig. 5 provides for the embodiment of the present invention;
A kind of inverse-excitation type isolation high-power driving circuit theory diagrams that Fig. 6 provides for the embodiment of the present invention;
A kind of multichannel output isolation high-power driving circuit theory diagrams that Fig. 7 provides for the embodiment of the present invention;
The isolated high-power drive circuit schematic diagram of a kind of modified model that Fig. 8 provides for the embodiment of the present invention;
A kind of isolated high-power drive circuit figure that Fig. 9 provides for the embodiment of the present invention;
The input signal S1-S2 oscillogram of a kind of isolated high-power drive circuit Fig. 9 that Figure 10 provides for the embodiment of the present invention; Output signal S3 oscillogram and output signal S4 oscillogram;
The isolated high-power drive circuit figure of another kind that Figure 11 provides for the embodiment of the present invention;
The input signal S1-S2 oscillogram of isolated high-power drive circuit Figure 11 of another kind that Figure 12 provides for the embodiment of the present invention; Output signal S3 oscillogram and output signal S4 oscillogram;
In a kind of isolated high-power drive circuit that Figure 13 provides for the embodiment of the present invention, the driving signal of isolating transformer secondary output is through driving the circuit diagram of chip drives;
In a kind of isolated high-power drive circuit that Figure 14 provides for the embodiment of the present invention, drive the circuit diagram of the drive power switch pipe of chip output;
A kind of structural representation of applying the Switching Power Supply of isolated high-power drive circuit that Figure 15 provides for the embodiment of the present invention.
Embodiment
A kind of isolated high-power drive circuit embodiment of the present invention being provided below in conjunction with accompanying drawing and the Switching Power Supply of applying this circuit are described in detail.
The structural representation of a kind of isolated high-power drive circuit providing for the embodiment of the present invention as shown in Figure 2; Described isolated high-power drive circuit, comprising: isolation drive transformer, former limit drive circuit, secondary drive circuit;
Described former limit drive circuit, for generation of and send pulse width signal to described isolation drive transformer;
Described isolation drive transformer, for described pulse width signal is carried out to isolation processing, obtains isolation signals; And described isolation signals is passed to described secondary drive circuit;
Described secondary drive circuit, for strengthening the driving force of described isolation signals, driving power switching tube.
Based on above embodiment, as shown in Figure 3, a kind of isolated high-power drive circuit schematic diagram providing for the embodiment of the present invention; Described former limit drive circuit comprises: drive signal circuit, capacitance C2 and discharge resistance R2; Described secondary drive circuit comprises: drive chip, current-limiting resistance R3, drive resistance R 4;
Described capacitance C2 and described discharge resistance R2 are in parallel;
Described capacitance C2 and described discharge resistance R2 two ends in parallel are cascaded with the former limit winding input A of described drive signal circuit output 1, isolation drive transformer T2 respectively;
Described drive signal circuit output 2 is connected with the former limit winding input B of described isolation drive transformer T2;
Described current-limiting resistance R 3 two ends are connected on the secondary output C of described isolation drive transformer T2 and the input 1 of described driving chip; Described driving chip output 2 is connected with the secondary output D of described isolation drive transformer T2; Described driving chip output 3 is connected with described driving resistance R 4 one end; Described driving chip output 4 is connected with power switch pipe Q2 source terminal S; Described driving resistance R 4 other ends are connected with described power switch pipe Q2 gate terminal G.
Be illustrated in figure 4 the structural representation of the isolated high-power drive circuit of a kind of modified model that the embodiment of the present invention provides; Described driving chip build-out resistor R5 two ends are connected in parallel on isolation drive transformer secondary output C and D.
It should be noted that, in above Fig. 3 and Fig. 4 embodiment, drive signal circuit is sent pulsewidth square wave as driving signal, drive signal through capacitance C2, to pass to the former limit winding of described isolation drive transformer T2, described capacitance C2 can play the logical effect exchanging of stopping direct current, prevent isolation drive transformer generation magnetic saturation, the AC signal that allows C2 passes to the former limit winding of isolation drive transformer T2, and discharge resistance R2 is for to C2 electric discharge, avoids C2 not have every straight effect.
What the former limit winding of the T2 of isolation drive transformer described in Fig. 3 and Fig. 4 obtained is one group of pulsewidth square wave, passing to secondary winding is also one group of pulsewidth square wave, the pulsewidth square wave that secondary obtains is as the input signal that drives chip, wherein, described current-limiting resistance R3 plays metering function in circuit, and restriction flows into the electric current that drives chip; Wherein, described coupling R5 plays impedance matching in circuit, strengthens the antijamming capability that secondary drives signal; Waveform tracking (in the same way or oppositely) the input waveform that drives chip output, passes to power switch pipe G, S two ends through the resistance R 4 of overdriving.Drive the type selecting of chip to select according to the power grade of switching tube.Isolated high-power drive circuit of the present invention, by isolation drive transformer transmission of signal, by driving chip that driving force is provided, can allow designer carry out flexible design to circuit, thereby can reduce product cost, and improve reliability.
It should be noted that, the secondary of described isolation drive transformer comprises at least one secondary winding; Described isolation drive transformer can be determined according to the quantity of described power switch pipe the quantity of secondary winding.
It should be noted that, the driving pulse width signal sending in the drive signal circuit of described former limit is one group of forward square wave pulse width, or is one group of negative sense square wave pulse width, or is one group of positive and negative alternately square wave pulse width; The driving pulse width signal that described former limit drive circuit sends is any duty ratio.
Also it should be noted that, described drive signal circuit send for SG3525, or UC3844, or the driving pulse width signal that sends of the control chip such as L6562, or the driving pulse width signal being sent by cpu chip.
It should be noted that, the type selecting of described driving chip can be selected according to the parameter of the power grade of described power switch pipe and power switch pipe; Described driving chip more preferably, can be TC4424, or IT2110 or other driving chips.
It should be noted that, described secondary drive circuit also comprises: a diode; Described diodes in parallel is connected between the input 1 and 2 of described driving chip, and described diode both positive and negative polarity closure is determined by the Same Name of Ends of described isolating transformer.
Also it should be noted that, described isolation drive transformer T2 is positive activation type transformer, or, be flyback transformer, or, be combined transformer.
Based on above example, as shown in Figure 5, a kind of isolation drive transformer T2 providing for the embodiment of the present invention is the isolated high-power drive circuit figure of positive activation type transformer; Wherein, former limit winding input A1 and the secondary output C1 of described isolation drive transformer T2 are Same Name of Ends.Described current-limiting resistance R3 one end is connected with driving chip input 1, and the other end is connected with secondary output C1.
Based on above example, as shown in Figure 6, the isolated high-power drive circuit figure that a kind of isolation drive transformer T2 providing for the embodiment of the present invention is flyback transformer; Wherein, former limit winding input A1 and the secondary output D1 of described isolation drive transformer T2 are Same Name of Ends.Described current-limiting resistance R3 one end is connected with driving chip input 2, and the other end is connected with secondary output D1.
Based on above example, as shown in Figure 7, the isolated high-power drive circuit figure that a kind of isolation drive transformer T2 providing for the embodiment of the present invention is combined transformer; Described isolation drive transformer T2 comprises two secondary windings.Wherein, former limit winding input A1 and secondary output C1, the D1 of described isolation drive transformer T2 are Same Name of Ends.Described current-limiting resistance R3 one end is connected with driving chip A input 1, and the other end is connected with secondary output C1; Described current-limiting resistance R6 one end is connected with driving chip B input 2, and the other end is connected with secondary output D1.
Based on above example, as shown in Figure 8, the isolated high-power drive circuit figure of a kind of positive activation type transformer with diode providing for the embodiment of the present invention; Described in this circuit, former limit winding input A1 and the secondary output C1 of isolation drive transformer T2 is Same Name of Ends.Described current-limiting resistance R3 one end is connected with driving chip input 1, and the other end is connected with secondary output C1.Described diode D1 is parallel between described driving chip input 1 and input 2, and described diode D1 positive terminal is connected with described driving chip input 2; Negative pole end is connected with described driving chip input 1.
It should be noted that described diodes in parallel is connected between the input 1 and 2 of described driving chip, described diode both positive and negative polarity closure is determined by the Same Name of Ends of described isolating transformer.If the flyback transformer that described isolated high-power drive circuit adopts as shown in Figure 6, described diode is connected positive terminal with described driving chip input 1; Negative pole end is connected with described driving chip input 2.
As shown in Figure 9, a kind of isolated high-power drive circuit figure providing for the embodiment of the present invention; This embodiment is the isolation drive transformer with 2 secondary windings, and driving two groups of 4 power switch pipes is that example describes isolated high-power drive circuit of the present invention.Wherein T2 is isolation drive transformer; R9 and R10 are the build-out resistors in circuit, and R11 and R12 are the current-limiting resistance in circuit, and R8 is discharge resistance, and capacitor C 2 is capacitance.The driving signal S4 that the S1-S2 waveform being sent by drive signal circuit obtains through isolation drive transformer T2 and the waveform of S3 are as shown in figure 10.
Driving signal S3 and S4 through isolation drive transformer isolation enter driving chip TC4424, as shown in figure 13, according to side circuit demand, single driving signal obtains having the two-way driving signal of high driving ability after input and output TC4424 chip (being respectively U1 and U2) in the same way.Again through driving resistance to obtain signal S3A, S3B and S4A and the S4B of driven MOS pipe.Wherein the output of the two-way of U1 connects respectively and drives resistance R 16 and R17; Wherein the output of the two-way of U2 connects respectively and drives resistance R 18 and R19; Capacitor C 3 and C4 are respectively the filtering capacitance of voltage regulation that drives chip power.
Because the internal structure of driving chip of different company own is different, some driving chips can bear the negative pressure of different electric pressures, some chips can not bear negative pressure, therefore in order to solve this high-power isolated drive circuit of the present invention, can adopt dissimilar this problem of driving chip, another isolated high-power drive circuit figure as shown in figure 11 be can adopt, at output, diode D2 and D3 increased.D2 mono-termination GND1 wherein, a termination S3; D3 mono-termination GND2 wherein, a termination S4.If the driving signal voltage being transmitted by former limit like this exists negative value, diode D2 and D 3 just can stop the generation of negative pressure signal, finally obtain the driving signal without negative pressure, as shown in figure 12.
After two drive chip TC4424, export driving signal S3A, S3B and the direct driving power switching tube of S4A, the S4B Q3 to Q6 with driving force, as shown in figure 14, the grid pull down resistor that wherein resistance R 20 to R23 is power switch pipe, makes the reliable turn-on and turn-off of power tube.
As shown in figure 15, a kind of Switching Power Supply providing for the embodiment of the present invention; This power supply comprises: any one isolated high-power drive circuit as mentioned above.
A kind of isolated high-power drive circuit that the embodiment of the present invention provides and apply the Switching Power Supply of this circuit, produces and sends pulse width signal to described isolation drive transformer by described former limit drive signal circuit; By described, every driving, from transformer, described pulse width signal is carried out to isolation processing, obtain isolation signals; And described isolation signals is passed to described secondary drive circuit; Described secondary drive circuit strengthens the driving force of described isolation signals, driving power switching tube.The isolated high-power drive circuit that the embodiment of the present invention provides, because secondary drive circuit has adopted the driving chip that strengthens described isolation signals driving force, met the required driving force of power switch pipe, thereby make power switch pipe when isolated drive circuit is operated in output maximum drive ability, can select the isolating transformer of small volume, thereby greatly reduce the cost of Switching Power Supply.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (11)
1. an isolated high-power drive circuit, is characterized in that, comprising: isolation drive transformer, former limit drive circuit, secondary drive circuit;
Described former limit drive circuit, for generation of and send pulse width signal to described isolation drive transformer;
Described isolation drive transformer, for described pulse width signal is carried out to isolation processing, obtains isolation signals; And described isolation signals is passed to described secondary drive circuit;
Described secondary drive circuit, for strengthening the driving force of described isolation signals, driving power switching tube.
2. isolated high-power drive circuit according to claim 1, is characterized in that, described former limit drive circuit comprises: drive signal circuit, capacitance C2 and discharge resistance R2; Described secondary drive circuit comprises: drive chip, current-limiting resistance R3 and drive resistance R 4;
Described capacitance C2 and described discharge resistance R2 are in parallel;
Described capacitance C2 and described discharge resistance R2 is in parallel, and two ends are cascaded with the former limit winding input A of described drive signal circuit output 1, isolation drive transformer T2 respectively;
Described drive signal circuit output 2 is connected with the former limit winding input B of described isolation drive transformer T2;
Described current-limiting resistance R 3 two ends are connected between the secondary output C of described isolation drive transformer T2 and the input 1 of described driving chip; Described driving chip output 2 is connected with the secondary output D of described isolation drive transformer T2; Described driving chip output 3 is connected with described driving resistance R 4 one end; Described driving chip output 4 is connected with the source terminal S of power switch pipe Q2; Described driving resistance R 4 other ends are connected with the gate terminal G of described power switch tube grid Q2.
3. isolated high-power drive circuit according to claim 2, is characterized in that, described secondary drive circuit also comprises: build-out resistor R5; Described build-out resistor R5 is parallel between the secondary output C and output D of described isolation drive transformer T2.
4. isolated high-power drive circuit according to claim 3, is characterized in that, described secondary drive circuit also comprises: a diode; Described diodes in parallel is connected between the input 1 and 2 of described driving chip, and described diode both positive and negative polarity closure is determined by the Same Name of Ends of described isolating transformer.
5. according to the isolated high-power drive circuit described in any one in claim 1 to 4, it is characterized in that, the secondary of described isolation drive transformer T2 comprises at least one secondary winding; Described isolation drive transformer T2 can determine according to the quantity of described power switch pipe the quantity of secondary winding.
6. isolated high-power drive circuit according to claim 5, is characterized in that, described isolation drive transformer T2 is positive activation type transformer, or, be flyback transformer, or, be combined transformer.
7. isolated high-power drive circuit according to claim 6, it is characterized in that, the driving pulse width signal sending in the drive circuit of described former limit is one group of forward square wave pulse width, or is one group of negative sense square wave pulse width, or is one group of positive and negative square wave pulse width replacing; The driving pulse width signal that described former limit drive circuit sends is any duty ratio.
8. isolated high-power drive circuit according to claim 7, it is characterized in that, the signal that described former limit drive circuit sends is the driving pulse width signal being sent by SG 3525 or UC 3844 or L6562 control chip, or the driving pulse width signal being sent by cpu chip.
9. isolated high-power drive circuit according to claim 8, is characterized in that, the type selecting of described driving chip can be selected according to the parameter of the power grade of described power switch pipe and power switch pipe.
10. isolated high-power drive circuit according to claim 9, is characterized in that, described driving chip is TC4424 or IR2110, or other drive chip.
11. 1 kinds of Switching Power Supplies, is characterized in that, this Switching Power Supply comprises: the isolated high-power drive circuit as described in any one in claim 1 to 10.
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| CN201210359067.5A CN103683863A (en) | 2012-09-25 | 2012-09-25 | Isolation type high-power driving circuit and switch power supply using circuit |
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| CN201210359067.5A CN103683863A (en) | 2012-09-25 | 2012-09-25 | Isolation type high-power driving circuit and switch power supply using circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106300931A (en) * | 2016-09-30 | 2017-01-04 | 许继电源有限公司 | A kind of numerical control and simulation hybrid driving circuit structure |
| CN106787633A (en) * | 2016-12-16 | 2017-05-31 | 广州金升阳科技有限公司 | Isolated drive circuit and isolation drive system |
| CN108649805A (en) * | 2018-06-14 | 2018-10-12 | 成都信息工程大学 | High power D C-DC power-switching circuits based on isolation and delay technology |
| CN109586709A (en) * | 2018-10-29 | 2019-04-05 | 华中科技大学 | A kind of pwm signal isolation and transmission circuit |
| CN113872419A (en) * | 2021-09-28 | 2021-12-31 | 成都芯源系统有限公司 | Isolation driving circuit and isolation driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106300931A (en) * | 2016-09-30 | 2017-01-04 | 许继电源有限公司 | A kind of numerical control and simulation hybrid driving circuit structure |
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| CN113872419A (en) * | 2021-09-28 | 2021-12-31 | 成都芯源系统有限公司 | Isolation driving circuit and isolation driving method |
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Application publication date: 20140326 |