CN204886674U - Take PWM drive circuit in blind spot - Google Patents
Take PWM drive circuit in blind spot Download PDFInfo
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- CN204886674U CN204886674U CN201520647973.4U CN201520647973U CN204886674U CN 204886674 U CN204886674 U CN 204886674U CN 201520647973 U CN201520647973 U CN 201520647973U CN 204886674 U CN204886674 U CN 204886674U
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Abstract
The utility model relates to a take PWM drive circuit in blind spot, fill the way of discharging slowly, a trickle charge generate electricity soon way, a homophase ware, a phase inverter, a protection circuit and an isolation transformer soon including one, the input and the drive signal input that fill the way of discharging slowly soon link to each other, the output that fills the way of discharging slowly soon with the input of phase inverter links to each other, the drive signal input still is connected to discharge the soon input on way of trickle charge, trickle charge discharge soon the way the output with the input of homophase ware links to each other, the output warp of phase inverter the the first line of protection circuit with isolation transformer's primary winding's one end links to each other, and the output of homophase ware passes through the the second line of protection circuit with isolation transformer's primary winding's the other end links to each other. The utility model discloses the principle of utilizing the transformer to end in the simultaneous working of level looks generates a pair of drive that has adjustable blind spot, and multiplicable blind spot and blind spot can set up, realizes simultaneously keeping apart and drives complementaryly.
Description
Technical field
The utility model relates to field of power electronics, particularly a kind of PWM drive circuit with dead band.
Background technology
In power electronic technology now, the circuit topology of many extensive uses, as half-bridge circuit, full-bridge circuit etc., once there is the phenomenon that upper and lower bridge arm switching tube is straight-through, will cause bridgc arm short, form very large short circuit current, cause switching tube to explode.For addressing this problem, common way adds a Dead Time, i.e. another pipe that opens the light of conducting again of each a period of time after switching tube cut-off.In much equipment, the PWM drive control signal of brachium pontis switching tube is sent by DSP/MCU etc.And the implement device in current drive circuit dead band, be generally by DSP/MCU program setting, export a pair driving by 2 I/O ports of DSP.IO resource occupation for DSP is more.If need DSP to export 2 to drive driving i.e. four roads, then need 4 I/O ports, be unfavorable for effective utilization of the I/O port resource of DSP.
Summary of the invention
In view of this, the purpose of this utility model is to provide a kind of PWM drive circuit with dead band, fills slow circuit, homophase device and inverter soon by RCD, utilizes transformer to work when level is identical the principle of cut-off, generates and have a pair driving in adjustable dead band.
The utility model adopts following scheme to realize: comprise one and fill slow circuit, the fast Power Generation Road of a trickle charge, a homophase device, an inverter, a protective circuit and an isolating transformer soon; The described input filling slow circuit is soon connected with a driving signal input, and the described output filling slow circuit is soon connected with the input of described inverter; Described driving signal input is also connected to described trickle charge and discharges soon the input on road, and discharge the soon output on road of described trickle charge is connected with the input of described homophase device; The output of described inverter is connected with one end of the armature winding of described isolating transformer through the first line of described protective circuit, and the output of described homophase device is connected with the other end of the armature winding of described isolating transformer through the second circuit of described protective circuit.
Further, described PWM drive circuit also comprises one first resistance R1, one end of described first resistance R1 is connected with a 12V power supply, and discharge the soon input on road of the input that the other end of described first resistance R1 fills slow circuit soon with described and described trickle charge is connected.
Further, the described slow circuit that fills soon comprises the first diode D1, the first electric capacity C1 and the second resistance R2; The fast Power Generation Road of described trickle charge comprises the second diode D2, the second electric capacity C2 and the 3rd resistance R3;
One end of described second resistance R2 is as the described input filling slow circuit soon, the two ends described first diode D1 in parallel of described second resistance R2, the positive pole of a described diode D1 is connected with one end of described second resistance R2, the negative pole of a described diode D1 is connected with one end of the other end of described second resistance R2 and described first electric capacity C1, the other end ground connection of described first electric capacity C1; The other end of described second resistance R2 is also connected with the input of described inverter as the described output filling slow circuit soon;
One end of described 3rd resistance R3 is as the described input filling slow circuit soon, the two ends described second diode D2 in parallel of described 3rd resistance R3, the positive pole of described two diode D2 is connected with one end of described 3rd resistance R3, the negative pole of described two diode D2 is connected with one end of the other end of described 3rd resistance R3 and described second electric capacity C2, the other end ground connection of described second electric capacity C2; The other end of described 3rd resistance R3 is also connected with the input of described inverter as the described output filling slow circuit soon.
Preferably, the described first diode D1 of the two ends parallel connection of the described second resistance R2 combination of devices with the unidirectional general character that is made up of single diode or is made up of a plurality of Diode series, parallel connection or connection in series-parallel.The combination of devices with the unidirectional general character that the described second diode D2 of the two ends parallel connection of described 3rd resistance R3 is made up of single diode or is made up of a plurality of Diode series, parallel connection or connection in series-parallel.
Further, described protective circuit comprises the 3rd electric capacity C3, the 4th resistance R4 and the 5th resistance R5; Described 3rd electric capacity C3 connects with described 4th resistance R4 the first line formed in described protective circuit, and the output of described inverter is connected through described first line one end with the armature winding of described isolating transformer; Described 5th resistance R5 is as the second circuit in described protective circuit, and the output of described homophase device is connected with the other end of the armature winding of described isolating transformer through described second circuit.
Preferably, described protective circuit also can comprise one the 4th electric capacity C4, and described 4th electric capacity C4 connects with described 5th resistance R5.
Further, described isolating transformer comprises two secondary winding, the Same Name of Ends negate of described two secondary winding, in order to export the drive singal of a pair complementation.Described isolating transformer also comprises four secondary winding, the Same Name of Ends negate of neighboring secondary winding in described four secondary winding, in order to export two drive singal to complementation.
Especially, if need output two to the drive singal of complementation, described PWM drive circuit also comprises another and fills slow circuit, the fast Power Generation Road of another trickle charge, another homophase device, another inverter, another protective circuit and another isolating transformer soon; The described input that another fills slow circuit is soon connected with described driving signal input, and the described output that another fills slow circuit is soon connected with the input of another inverter described; Another driving signal input described is also connected to another trickle charge described and discharges soon the input on road, and discharge the soon output on road of another trickle charge described is connected with the input of another homophase device described; The output of another inverter described is connected with one end of the armature winding of another isolating transformer described through the first line of another protective circuit described, and the output of another homophase device described is connected with the other end of the armature winding of another isolating transformer described through the second circuit of another protective circuit described.
Compared with prior art, the utility model has following beneficial effect: 1, adopt simple discrete component and driving chip, by a road I/O mouth output signal in dsp chip, generates the two-way complementary drive signals that a pair dead band is adjustable, saves I/O mouth resource.2, drive circuit hardware device reduces, and cost reduces, and more reduces the volume of drive circuit, improves its practicality and reliability.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Fig. 3 is the ideal waveform that the dead band of PWM drive circuit in the utility model realizes.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
The present embodiment provides a kind of PWM drive circuit with dead band, as shown in Figure 1, comprises one and fills slow circuit, the fast Power Generation Road of a trickle charge, a homophase device, an inverter, a protective circuit and an isolating transformer soon; The described input filling slow circuit is soon connected with a driving signal input, and the described output filling slow circuit is soon connected with the input of described inverter; Described driving signal input is also connected to described trickle charge and discharges soon the input on road, and discharge the soon output on road of described trickle charge is connected with the input of described homophase device; The output of described inverter is connected with one end of the armature winding of described isolating transformer through the first line of described protective circuit, and the output of described homophase device is connected with the other end of the armature winding of described isolating transformer through the second circuit of described protective circuit.
In the present embodiment, as shown in Figure 2, described PWM drive circuit also comprises one first resistance R1, and one end of described first resistance R1 is connected with a 12V power supply, and discharge the soon input on road of the input that the other end of described first resistance R1 fills slow circuit soon with described and described trickle charge is connected.
In the present embodiment, the described slow circuit that fills soon comprises the first diode D1, the first electric capacity C1 and the second resistance R2; The fast Power Generation Road of described trickle charge comprises the second diode D2, the second electric capacity C2 and the 3rd resistance R3;
One end of described second resistance R2 is as the described input filling slow circuit soon, the two ends described first diode D1 in parallel of described second resistance R2, the positive pole of a described diode D1 is connected with one end of described second resistance R2, the negative pole of a described diode D1 is connected with one end of the other end of described second resistance R2 and described first electric capacity C1, the other end ground connection of described first electric capacity C1; The other end of described second resistance R2 is also connected with the input of described inverter as the described output filling slow circuit soon;
One end of described 3rd resistance R3 is as the described input filling slow circuit soon, the two ends described second diode D2 in parallel of described 3rd resistance R3, the positive pole of described two diode D2 is connected with one end of described 3rd resistance R3, the negative pole of described two diode D2 is connected with one end of the other end of described 3rd resistance R3 and described second electric capacity C2, the other end ground connection of described second electric capacity C2; The other end of described 3rd resistance R3 is also connected with the input of described inverter as the described output filling slow circuit soon;
In the present embodiment, preferably, the described first diode D1 of the two ends parallel connection of the described second resistance R2 combination of devices with the unidirectional general character that is made up of single diode or is made up of a plurality of Diode series, parallel connection or connection in series-parallel.The combination of devices with the unidirectional general character that the described second diode D2 of the two ends parallel connection of described 3rd resistance R3 is made up of single diode or is made up of a plurality of Diode series, parallel connection or connection in series-parallel.
In the present embodiment, described protective circuit comprises the 3rd electric capacity C3, the 4th resistance R4 and the 5th resistance R5; Described 3rd electric capacity C3 connects with described 4th resistance R4 the first line formed in described protective circuit, and the output of described inverter is connected through described first line one end with the armature winding of described isolating transformer; Described 5th resistance R5 is as the second circuit in described protective circuit, and the output of described homophase device is connected with the other end of the armature winding of described isolating transformer through described second circuit.
In the present embodiment, preferably, described protective circuit also can comprise one the 4th electric capacity C4, and described 4th electric capacity C4 connects with described 5th resistance R5.
In the present embodiment, described isolating transformer comprises two secondary winding, the Same Name of Ends negate of described two secondary winding, in order to export the drive singal of a pair complementation.Described isolating transformer also comprises four secondary winding, the Same Name of Ends negate of neighboring secondary winding in described four secondary winding, in order to export two drive singal to complementation.
In the present embodiment, described isolating transformer comprises two secondary winding, the Same Name of Ends negate of described two secondary winding, when can export the drive singal of a pair complementation, specific works principle is as follows, formed drive singal ideal waveform as shown in Figure 3: in the ideal situation, input queued switches is after trickle charge puts circuit function soon, its rising edge by t1 moment time delay to the t2 moment, its trailing edge with input queued switches trailing edge, in t3 moment action, not time delay, as shown in waveform B in Fig. 3, the duty ratio now driven is less than 50%.And input queued switches is after filling slow circuit effect soon, the same input queued switches of its rising edge, in t1 moment action, the comparatively input queued switches time delay lower operate time of its trailing edge, by t3 time delay to t4, as shown in waveform C in Fig. 3, now the duty ratio of drive waveforms is greater than 50%, after inverter effect, obtain waveform D, its duty ratio is less than 50%.Now, waveform B and D is obtained at isolating transformer armature winding two ends, as shown in Figure 3.When there is same level in primary winding two ends (t1-t2 is interval, t3-t4 is interval), armature winding work ends, secondary two windings are also in work cut-off state, namely when primary waveform is with low level, obtain dead band at transformer secondary output.Drive a in Fig. 3 and drive b to be the driving a pair with dead band Da and Db of realization.Wherein, the parameter of putting road of discharging soon with trickle charge is slowly filled in adjustment soon, makes waveform B, D has identical duty ratio and delay time, can obtain dead band identical (Da=Db) at transformer secondary output, and a pair drive waveforms of symmetrical complement.
In the present embodiment, especially, if need output two to the drive singal of complementation, then need to increase an identical road circuit.Be specially: described PWM drive circuit also comprises another and fills slow circuit, the fast Power Generation Road of another trickle charge, another homophase device, another inverter, another protective circuit and another isolating transformer soon; The described input that another fills slow circuit is soon connected with described driving signal input, and the described output that another fills slow circuit is soon connected with the input of another inverter described; Another driving signal input described is also connected to another trickle charge described and discharges soon the input on road, and discharge the soon output on road of another trickle charge described is connected with the input of another homophase device described; The output of another inverter described is connected with one end of the armature winding of another isolating transformer described through the first line of another protective circuit described, and the output of another homophase device described is connected with the other end of the armature winding of another isolating transformer described through the second circuit of another protective circuit described.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (10)
1. the PWM drive circuit with dead band, is characterized in that: comprise one and fill slow circuit, the fast Power Generation Road of a trickle charge, a homophase device, an inverter, a protective circuit and an isolating transformer soon; The described input filling slow circuit is soon connected with a driving signal input, and the described output filling slow circuit is soon connected with the input of described inverter; Described driving signal input is also connected to described trickle charge and discharges soon the input on road, and discharge the soon output on road of described trickle charge is connected with the input of described homophase device; The output of described inverter is connected with one end of the armature winding of described isolating transformer through the first line of described protective circuit, and the output of described homophase device is connected with the other end of the armature winding of described isolating transformer through the second circuit of described protective circuit.
2. a kind of PWM drive circuit with dead band according to claim 1, it is characterized in that: described PWM drive circuit also comprises one first resistance R1, one end of described first resistance R1 is connected with a 12V power supply, and discharge the soon input on road of the input that the other end of described first resistance R1 fills slow circuit soon with described and described trickle charge is connected.
3. a kind of PWM drive circuit with dead band according to claim 1, is characterized in that:
The described slow circuit that fills soon comprises the first diode D1, the first electric capacity C1 and the second resistance R2;
The fast Power Generation Road of described trickle charge comprises the second diode D2, the second electric capacity C2 and the 3rd resistance R3;
One end of described second resistance R2 is as the described input filling slow circuit soon, the two ends described first diode D1 in parallel of described second resistance R2, the positive pole of a described diode D1 is connected with one end of described second resistance R2, the negative pole of a described diode D1 is connected with one end of the other end of described second resistance R2 and described first electric capacity C1, the other end ground connection of described first electric capacity C1; The other end of described second resistance R2 is also connected with the input of described inverter as the described output filling slow circuit soon;
One end of described 3rd resistance R3 is as the described input filling slow circuit soon, the two ends described second diode D2 in parallel of described 3rd resistance R3, the positive pole of described two diode D2 is connected with one end of described 3rd resistance R3, the negative pole of described two diode D2 is connected with one end of the other end of described 3rd resistance R3 and described second electric capacity C2, the other end ground connection of described second electric capacity C2; The other end of described 3rd resistance R3 is also connected with the input of described inverter as the described output filling slow circuit soon.
4. a kind of PWM drive circuit with dead band according to claim 3, is characterized in that: the combination of devices with the unidirectional general character that the described first diode D1 of the two ends parallel connection of described second resistance R2 is made up of single diode or is made up of a plurality of Diode series, parallel connection or connection in series-parallel.
5. a kind of PWM drive circuit with dead band according to claim 3, is characterized in that: the combination of devices with the unidirectional general character that the described second diode D2 of the two ends parallel connection of described 3rd resistance R3 is made up of single diode or is made up of a plurality of Diode series, parallel connection or connection in series-parallel.
6. a kind of PWM drive circuit with dead band according to claim 1, is characterized in that: described protective circuit comprises the 3rd electric capacity C3, the 4th resistance R4 and the 5th resistance R5; Described 3rd electric capacity C3 connects with described 4th resistance R4 the first line formed in described protective circuit, and the output of described inverter is connected through described first line one end with the armature winding of described isolating transformer; Described 5th resistance R5 is as the second circuit in described protective circuit, and the output of described homophase device is connected with the other end of the armature winding of described isolating transformer through described second circuit.
7. a kind of PWM drive circuit with dead band according to claim 6, is characterized in that: described protective circuit also comprises one the 4th electric capacity C4, and described 4th electric capacity C4 connects with described 5th resistance R5.
8. a kind of PWM drive circuit with dead band according to claim 1, is characterized in that: described isolating transformer comprises two secondary winding, the Same Name of Ends negate of described two secondary winding, in order to export the drive singal of a pair complementation.
9. a kind of PWM drive circuit with dead band according to claim 1, is characterized in that: described isolating transformer comprises four secondary winding, the Same Name of Ends negate of neighboring secondary winding in described four secondary winding, in order to export two drive singal to complementation.
10. a kind of PWM drive circuit with dead band according to claim 8, is characterized in that: described PWM drive circuit also comprises another and fills slow circuit, the fast Power Generation Road of another trickle charge, another homophase device, another inverter, another protective circuit and another isolating transformer soon; The described input that another fills slow circuit is soon connected with described driving signal input, and the described output that another fills slow circuit is soon connected with the input of another inverter described; Another driving signal input described is also connected to another trickle charge described and discharges soon the input on road, and discharge the soon output on road of another trickle charge described is connected with the input of another homophase device described; The output of another inverter described is connected with one end of the armature winding of another isolating transformer described through the first line of another protective circuit described, and the output of another homophase device described is connected with the other end of the armature winding of another isolating transformer described through the second circuit of another protective circuit described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520647973.4U CN204886674U (en) | 2015-08-26 | 2015-08-26 | Take PWM drive circuit in blind spot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520647973.4U CN204886674U (en) | 2015-08-26 | 2015-08-26 | Take PWM drive circuit in blind spot |
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| CN204886674U true CN204886674U (en) | 2015-12-16 |
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| CN201520647973.4U Active CN204886674U (en) | 2015-08-26 | 2015-08-26 | Take PWM drive circuit in blind spot |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021017861A1 (en) * | 2019-07-26 | 2021-02-04 | 卢驭龙 | Isolation protection circuit and voltage conversion device |
| CN112953200A (en) * | 2021-01-15 | 2021-06-11 | 北京军陶科技有限公司 | Power supply with time sequence control of first switch and then switch |
-
2015
- 2015-08-26 CN CN201520647973.4U patent/CN204886674U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021017861A1 (en) * | 2019-07-26 | 2021-02-04 | 卢驭龙 | Isolation protection circuit and voltage conversion device |
| CN112953200A (en) * | 2021-01-15 | 2021-06-11 | 北京军陶科技有限公司 | Power supply with time sequence control of first switch and then switch |
| CN112953200B (en) * | 2021-01-15 | 2021-11-16 | 北京军陶科技有限公司 | Power supply with time sequence control of first switch and then switch |
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