CN209930127U - Power switch tube driving system - Google Patents
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- CN209930127U CN209930127U CN201921146073.6U CN201921146073U CN209930127U CN 209930127 U CN209930127 U CN 209930127U CN 201921146073 U CN201921146073 U CN 201921146073U CN 209930127 U CN209930127 U CN 209930127U
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Abstract
The utility model provides a power switch tube driving system, which comprises a power switch tube driver, a first output end and a second output end, wherein the power switch tube driver receives a pulse width modulation signal, outputs a first control signal at the first output end based on the pulse width modulation signal, and outputs a second control signal at the second output end; the current limiting circuit is connected with the first output end and the second output end of the power switch tube driver and outputs a driving signal of the power switch tube; the current limiting circuit at least comprises a first resistor, wherein the first end of the first resistor is connected with the first output end of the power switch tube driver, and the second end of the first resistor is connected with the second output end of the power switch tube driver and the output end of the current limiting circuit. The utility model discloses a power switch tube actuating system carries out the current-limiting to power switch tube driver's output signal to because the inconsistent output short circuit that arouses of output end and lead to power switch tube driver's damage when avoiding power switch tube driver's two tunnel outputs to connect in parallel, improve system stability and security, reduce cost of maintenance.
Description
Technical Field
The utility model relates to a power electronic transform field especially relates to a power switch tube actuating system.
Background
With the increase in frequency of power electronic converters, it is often necessary to increase the driving capability of the power switching tube to increase the switching speed and reduce the switching loss. Many semiconductor companies can provide integrated power switch tube drivers configured with dual channels, such as UCC2752X from TI and 2EDN752x/2EDN852x from Infineon, but there is a great risk of simply connecting the outputs of the two channels of the driver in parallel to improve the driving capability.
Referring to fig. 1, a conventional dual-channel power switching tube driver is shown, where transmission delay between an input end and an output end of the driver is determined by characteristics of the driver itself, and differences in transmission delay between two channels of the driver are caused by inevitable differences in devices (e.g., a comparator and an amplifier) inside the driver due to manufacturing processes and the like. And because of auxiliary circuits such as filtering circuits and the like arranged at the front stage of the input end of the driver, the PWM signal at the input end becomes a pulse input signal with slow rising and falling, so that the transmission difference of the two channels is intensified. Even if two channels of the dual-channel power switch tube driver are connected with the same input signal, if the output ends of the two channels are connected in parallel at the moment, as shown in fig. 2, due to the transmission difference of the two channels, the output ends of the two channels output different signals within a certain time period, so that the output end of the driver is short-circuited, and the driver is burnt.
Therefore, how to ensure the safety and stability of the driver while improving the driving capability has become one of the problems to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a power switch tube driving system for solving the problem of device damage caused by parallel connection of the output ends of the dual-channel power switch tube driver in the prior art.
To achieve the above and other related objects, the present invention provides a power switching tube driving system, which at least comprises:
the power switch tube driver receives the pulse width modulation signal, outputs a first control signal at a first output end based on the pulse width modulation signal and outputs a second control signal at a second output end;
the current limiting circuit is connected with the first output end and the second output end of the power switch tube driver and outputs a driving signal of the power switch tube; the current limiting circuit at least comprises a first resistor, wherein the first end of the first resistor is connected with the first output end of the power switch tube driver, the second end of the first resistor is connected with the second output end of the power switch tube driver and the output end of the current limiting circuit, and the second control signal is connected with the second end of the first resistor.
Optionally, the current limiting circuit further includes a second resistor, the second output terminal of the power switching tube driver is connected to the second terminal of the first resistor via the second resistor, the first terminal of the second resistor is connected to the second output terminal of the power switching tube driver, and the second terminal of the second resistor is connected to the second terminal of the first resistor.
More optionally, the first resistor and the second resistor have the same resistance.
More optionally, the current limiting circuit further includes a third resistor and a first diode; the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the output end of the current limiting circuit; and the cathode of the first diode is connected with the first end of the third resistor, and the anode of the first diode is connected with the second end of the third resistor.
More optionally, the current limiting circuit further includes a fourth resistor, a second diode, and a third diode; a first end of the fourth resistor is connected with second ends of the first resistor and the second resistor, and a second end of the fourth resistor is connected with an output end of the current limiting circuit; the cathode of the second diode is connected with the first end of the first resistor, and the anode of the second diode is connected with the second end of the first resistor; and the cathode of the third diode is connected with the first end of the second resistor, and the anode of the third diode is connected with the second end of the second resistor.
Optionally, the current limiting circuit further includes a fifth resistor and a fourth diode; the first end of the fifth resistor is connected with the second end of the first resistor, and the second end of the fifth resistor is connected with the output end of the current limiting circuit; the cathode of the fourth diode is connected with the first end of the first resistor, and the anode of the fourth diode is connected with the second end of the first resistor.
Optionally, the current limiting circuit further includes a sixth resistor, a seventh resistor, an eighth resistor, a fifth diode, and a sixth diode; the first end of the sixth resistor is connected with the second end of the first resistor, and the second end of the sixth resistor is connected with the output end of the current limiting circuit; the cathode of the fifth diode is connected with the first end of the first resistor, and the anode of the fifth diode is connected with the second end of the first resistor; a first end of the seventh resistor is connected with the second control signal, a second end of the seventh resistor is connected with a first end of the eighth resistor, and a second end of the eighth resistor is connected with an output end of the current limiting circuit; and the cathode of the sixth diode is connected with the first end of the seventh resistor, and the anode of the sixth diode is connected with the second end of the seventh resistor.
More optionally, the first resistor and the seventh resistor have the same resistance, and the sixth resistor and the eighth resistor have the same resistance.
As described above, the utility model discloses a power switch tube actuating system has following beneficial effect:
the utility model discloses a power switch tube actuating system carries out the current-limiting to power switch tube driver's output signal to because the inconsistent output short circuit that arouses of output end and lead to power switch tube driver's damage when avoiding power switch tube driver's two tunnel outputs to connect in parallel, improve system stability and security, reduce cost of maintenance.
Drawings
Fig. 1 is a schematic diagram of a dual channel driver in the prior art.
Fig. 2 shows a schematic diagram of the principle of a short circuit caused by the parallel connection of the output terminals of two channels of a driver in the prior art.
Fig. 3 is a block diagram of a power switch tube driving system according to the present invention.
Fig. 4 is a schematic diagram of a first structure of a power switching tube driving system according to the present invention.
Fig. 5 is a schematic diagram of a second structure of the power switching tube driving system according to the present invention.
Fig. 6 is a schematic diagram of a third structure of the power switching tube driving system of the present invention.
Fig. 7 is a schematic diagram illustrating a fourth structure of the power switching tube driving system according to the present invention.
Fig. 8 is a schematic diagram illustrating a fifth structure of the power switching tube driving system of the present invention.
Fig. 9 is a schematic diagram illustrating a sixth structure of the power switching tube driving system according to the present invention.
Description of the element reference numerals
1 power switch tube driving system
11 power switch tube driver
12 current limiting circuit
13 auxiliary circuit
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
Please refer to fig. 3 to fig. 9. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
Example one
As shown in fig. 3, the present embodiment provides a power switch tube driving system 1, where the power switch tube driving system 1 includes:
a power switch tube driver 11 and a current limiting circuit 12.
As shown in fig. 3, the power switch tube driver 11 receives the PWM signal PWM, and outputs a first control signal ctl1 at a first output terminal and a second control signal ctl2 at a second output terminal based on the PWM signal PWM.
Specifically, in this embodiment, two input terminals of the power switch tube driver 11 are connected in parallel to receive the same PWM signal, and in other embodiments, two input terminals of the power switch tube driver 11 may receive two identical PWM signals respectively. After the PWM signal received by the input terminal is amplified by the power switch tube driver 11, the first control signal ctl1 and the second control signal ctl2 output by the two output terminals are theoretically the same (i.e. both high level and low level), but due to the problems proposed in the background art, the first control signal ctl1 and the second control signal ctl2 output by the two output terminals are different in a certain period of time (i.e. one is high level and the other is low level).
It should be noted that the PWM signal may be a standard PWM signal or a non-standard PWM signal, for example, the standard PWM signal is converted into the non-standard PWM signal after passing through the filter circuit 13 (as shown in fig. 4, the filter circuit 13 includes, but is not limited to, an RC filter circuit). The nonstandard PWM signal is a non-strict square wave signal, and a rising edge and a falling edge of the non-standard PWM signal have a slowly changing process, so that the different time lengths of the first control signal ctl1 and the second control signal ctl2 can be aggravated, as shown in fig. 2, which is not described herein again.
As shown in fig. 3, the current limiting circuit 12 is connected to the output terminal of the power switching transistor driver 11, and outputs a driving signal drv of the power switching transistor.
Specifically, in this embodiment, the current limiting circuit 12 at least includes a first resistor R1, a first end of the first resistor R1 is connected to a first output end of the power switch tube driver 11 (receiving the first control signal ctl1), a second end of the first resistor R1 is connected to an output end of the current limiting circuit 12, and a second output end of the power switch tube driver 11 is connected to a second end of the first resistor R1. The driving signal drv is connected to the control terminal of the power switch Q1 to drive the power switch Q1 to turn on and off. When the first control signal ctl1 and the second control signal ctl2 output from the two output terminals of the power switching tube driver 11 are different, if the two output terminals of the power switching tube driver 11 are directly connected, the channel a and the channel B of the power switching tube driver 11 are connected in a vertical straight-through manner, so as to damage the power switching tube driver 11, and in this embodiment, one of the output terminals is connected to the other output terminal after being added with the first resistor R1, so that the first resistor R1 is connected in series with the channel a and the channel B of the power switching tube driver 11, so as to perform a current limiting function, so as to prevent the channel a and the channel B of the power switching tube driver 11 from being damaged by the vertical straight-through manner, and output the driving signal drv to the control terminal of the power switching tube Q1 at the subsequent stage of the first resistor R1.
It should be noted that other modules may be further included between the driving signal drv and the control end of the power switch Q1, which is not described herein.
It should be noted that the first control signal ctl1 and the second control signal ctl2 are only used for distinguishing two signals output by the power switch tube driver 11, and there is no specific meaning, that is, the first resistor R1 may be connected to any one of the two output terminals of the power switch tube driver 11, so as to prevent the two output terminals of the power switch tube driver 11 from being directly connected, and further, when the two output terminals output different signals, the output terminal is short-circuited to damage the power switch tube driver 11.
Example two
As shown in fig. 5, the present embodiment provides a power switch driving system 1, which is different from the first embodiment in that the current limiting circuit further includes a second resistor R2.
Specifically, a first end of the second resistor R2 is connected to the second output end of the power switching tube driver 11 (receiving the second control signal ctl2), and a second end of the second resistor R2 is connected to the second end of the first resistor R1.
It should be noted that, as an implementation manner of the present invention, the first resistor R1 and the resistance of the second resistor R2 are different, so that the two outputs of the power switch tube driver 11 are directly connected to each other, and the power switch tube driver 11 is damaged. As another implementation of the present invention, the first resistor R1 and the second resistor R2 have the same resistance, and are avoided when two outputs of the power switch tube driver 11 are directly connected, the currents of two outputs of the power switch tube driver 11 are balanced, and the system performance is better.
EXAMPLE III
As shown in fig. 6, the present embodiment provides a power switch driving system 1, which is different from the second embodiment in that the current limiting circuit further includes a third resistor R3 and a first diode D1.
Specifically, a first end of the third resistor R3 is connected to second ends of the first resistor R1 and the second resistor R2, and a second end of the third resistor R3 is connected to an output end of the current limiting circuit 12, that is, the third resistor R3 is connected in series between the second end of the first resistor R1 and the output end of the current limiting circuit 12. The cathode of the first diode D1 is connected to the first end of the third resistor R3, and the anode is connected to the second end of the third resistor R3.
It should be noted that the third resistor R3 and the first diode D1 are used for adjusting the on-time and the off-time of the power switch Q1. In this embodiment, when the power switch Q1 is turned on, the current passes through the first resistor R1 and the second resistor R2 connected in parallel and then is transmitted to the control end of the power switch Q1 through the third resistor R3, so the on-time of the power switch Q1 is determined by R1// R2+ R3(R1 and R3 after R2); when the power switch tube Q1 is turned off, current flows back through the first resistor R1 and the second resistor R2 connected in parallel after passing through the first diode D1, and therefore the turn-off time of the power switch tube Q1 is determined by R1// R2(R1 and R2); therefore, the present embodiment can realize that the turn-off time of the power switch Q1 is shorter than the turn-on time, i.e. turn-off is fast and slow.
It should be noted that the third resistor R3 and the first diode D1 can also be applied to the first embodiment, and are not described in detail herein.
Example four
As shown in fig. 7, the present embodiment provides a power switch driving system 1, which is different from the second embodiment in that the current limiting circuit further includes a fourth resistor R4, a second diode D2, and a third diode D3.
Specifically, a first end of the fourth resistor R4 is connected to second ends of the first resistor R1 and the second resistor R2, and a second end of the fourth resistor R4 is connected to an output end of the current limiting circuit 12, that is, the fourth resistor R4 is connected in series between the second end of the first resistor R1 and the output end of the current limiting circuit 12. The cathode of the second diode D2 is connected to the first end of the first resistor R1, and the anode is connected to the second end of the first resistor R1. The cathode of the third diode D3 is connected to the first end of the second resistor R2, and the anode is connected to the second end of the second resistor R2.
The fourth resistor R4, the second diode D2, and the third diode D3 are used to adjust the on-time and the off-time of the power switch Q1. In this embodiment, when the power switch Q1 is turned on, the current passes through the first resistor R1 and the second resistor R2 connected in parallel and then is transmitted to the control end of the power switch Q1 through the fourth resistor R4, so the on-time of the power switch Q1 is determined by R1// R2+ R4(R1 and R4 after R2); when the power switch Q1 is turned off, current flows through the fourth resistor R4 and then flows back through the second diode D2 and the third diode D3 which are connected in parallel, so that the turn-off time of the power switch Q1 is determined by R4; therefore, the present embodiment can also realize that the turn-off time of the power switch Q1 is shorter than the turn-on time, i.e. turn-off is fast and slow.
EXAMPLE five
As shown in fig. 8, the present embodiment provides a power switch driving system 1, which is different from the first embodiment in that the current limiting circuit further includes a fifth resistor R5 and a fourth diode D4.
Specifically, a first end of the fifth resistor R5 is connected to a second end of the first resistor R1, and a second end of the fifth resistor R5 is connected to the output end of the current limiting circuit 12, that is, the fifth resistor R5 is connected in series between the second end of the first resistor R1 and the output end of the current limiting circuit 12. The cathode of the fourth diode D4 is connected to the first end of the first resistor R1, and the anode is connected to the second end of the first resistor R1.
It should be noted that the fifth resistor R5 and the fourth diode D4 are used for adjusting the on-time and the off-time of the power switch Q1, and specific principles refer to the fourth embodiment, which is not described herein.
EXAMPLE six
As shown in fig. 9, the present embodiment provides a power switch driving system 1, which is different from the first embodiment in that the current limiting circuit further includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fifth diode D5, and a sixth diode D6.
Specifically, a first end of the sixth resistor R6 is connected to a second end of the first resistor R1, and a second end of the sixth resistor R6 is connected to the output end of the current limiting circuit 12, that is, the sixth resistor R6 is connected in series between the second end of the first resistor R1 and the output end of the current limiting circuit 12. The cathode of the fifth diode D5 is connected to the first end of the first resistor R1, and the anode is connected to the second end of the first resistor R1. A first end of the seventh resistor R7 is connected to the second control signal ctl2, a second end of the seventh resistor R7 is connected to a first end of the eighth resistor R8, and a second end of the eighth resistor R8 is connected to the output terminal of the current limiting circuit 12. The cathode of the sixth diode D6 is connected to the first end of the seventh resistor R7, and the anode thereof is connected to the second end of the seventh resistor R7.
The sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the fifth diode D5, and the sixth diode D6 are used to adjust the on-time and the off-time of the power switch Q1. In this embodiment, when the power switch Q1 is turned on, a current passes through a first resistor string and a second resistor string connected in parallel and then is transmitted to the control end of the power switch Q1, where the first resistor string includes a first resistor R1 and a sixth resistor R6 connected in series, and the second resistor string includes a seventh resistor R7 and an eighth resistor R8 connected in series, so that the on time of the power switch Q1 is determined by (R1+ R6)/(R7 + R8) (strings of R1 and R6, and strings of R7 and R8, which are then connected in parallel); when the power switch Q1 is turned off, current flows back through the fifth diode D5 via the sixth resistor R6 and through the sixth diode D6 via the eighth resistor R8, so that the turn-off time of the power switch Q1 is determined by R6// R8; therefore, the present embodiment can also realize that the turn-off time of the power switch Q1 is shorter than the turn-on time, i.e. turn-off is fast and slow.
It should be noted that, as an implementation manner of the present invention, the first resistor R1 and the resistance of the seventh resistor R7 are different or the sixth resistor R6 and the resistance of the eighth resistor R8 are different, so that the two output ends of the power switch tube driver 11 can be directly connected, and the adjustment of the on-time and the off-time of the power switch tube Q1 can also be realized. As another implementation manner of the present invention, the first resistor R1 and the seventh resistor R7 has the same resistance, and the sixth resistor has the same resistance as the eighth resistor, so that the two outputs of the power switch tube driver 11 are directly connected and adjusted, and when the on-time and the off-time of the power switch tube Q1 are reached, the currents of the two outputs of the power switch tube driver 11 are balanced, and the system performance is better.
To sum up, the utility model provides a power switch tube driving system, which comprises a power switch tube driver, a first output end and a second output end, wherein the power switch tube driver receives a pulse width modulation signal, outputs a first control signal at the first output end based on the pulse width modulation signal, and outputs a second control signal at the second output end; the current limiting circuit is connected with the first output end and the second output end of the power switch tube driver and outputs a driving signal of the power switch tube; the current limiting circuit at least comprises a first resistor, wherein the first end of the first resistor is connected with the first output end of the power switch tube driver, and the second end of the first resistor is connected with the second output end of the power switch tube driver and the output end of the current limiting circuit. The utility model discloses a power switch tube actuating system carries out the current-limiting to power switch tube driver's output signal to because the inconsistent output short circuit that arouses of output end and lead to power switch tube driver's damage when avoiding power switch tube driver's two tunnel outputs to connect in parallel, improve system stability and security, reduce cost of maintenance. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A power switching tube drive system, comprising at least:
the power switch tube driver receives the pulse width modulation signal, outputs a first control signal at a first output end based on the pulse width modulation signal and outputs a second control signal at a second output end;
the current limiting circuit is connected with the first output end and the second output end of the power switch tube driver and outputs a driving signal of the power switch tube; the current limiting circuit at least comprises a first resistor, wherein the first end of the first resistor is connected with the first output end of the power switch tube driver, and the second end of the first resistor is connected with the second output end of the power switch tube driver and the output end of the current limiting circuit.
2. The power switching tube driving system according to claim 1, wherein: the current limiting circuit further comprises a second resistor, a second output end of the power switch tube driver is connected to a second end of the first resistor through the second resistor, a first end of the second resistor is connected to a second output end of the power switch tube driver, and a second end of the second resistor is connected to a second end of the first resistor.
3. The power switching tube driving system according to claim 2, wherein: the resistance values of the first resistor and the second resistor are the same.
4. The power switching tube driving system according to any one of claims 1 to 3, wherein: the current limiting circuit further comprises a third resistor and a first diode; the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the output end of the current limiting circuit; and the cathode of the first diode is connected with the first end of the third resistor, and the anode of the first diode is connected with the second end of the third resistor.
5. A power switching tube driving system according to claim 2 or 3, characterized in that: the current limiting circuit further comprises a fourth resistor, a second diode and a third diode; a first end of the fourth resistor is connected with second ends of the first resistor and the second resistor, and a second end of the fourth resistor is connected with an output end of the current limiting circuit; the cathode of the second diode is connected with the first end of the first resistor, and the anode of the second diode is connected with the second end of the first resistor; and the cathode of the third diode is connected with the first end of the second resistor, and the anode of the third diode is connected with the second end of the second resistor.
6. The power switching tube driving system according to claim 1, wherein: the current limiting circuit further comprises a fifth resistor and a fourth diode; the first end of the fifth resistor is connected with the second end of the first resistor, and the second end of the fifth resistor is connected with the output end of the current limiting circuit; the cathode of the fourth diode is connected with the first end of the first resistor, and the anode of the fourth diode is connected with the second end of the first resistor.
7. The power switching tube driving system according to claim 1, wherein: the current limiting circuit further comprises a sixth resistor, a seventh resistor, an eighth resistor, a fifth diode and a sixth diode; the first end of the sixth resistor is connected with the second end of the first resistor, and the second end of the sixth resistor is connected with the output end of the current limiting circuit; the cathode of the fifth diode is connected with the first end of the first resistor, and the anode of the fifth diode is connected with the second end of the first resistor; a first end of the seventh resistor is connected with the second control signal, a second end of the seventh resistor is connected with a first end of the eighth resistor, and a second end of the eighth resistor is connected with an output end of the current limiting circuit; and the cathode of the sixth diode is connected with the first end of the seventh resistor, and the anode of the sixth diode is connected with the second end of the seventh resistor.
8. The power switching tube driving system according to claim 7, wherein: the first resistor and the seventh resistor have the same resistance value, and the sixth resistor and the eighth resistor have the same resistance value.
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| CN201921146073.6U CN209930127U (en) | 2019-07-19 | 2019-07-19 | Power switch tube driving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113972815A (en) * | 2020-07-24 | 2022-01-25 | 茂睿芯（深圳）科技有限公司 | Dual-channel gate drive circuit and dual-channel gate drive chip |
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2019
- 2019-07-19 CN CN201921146073.6U patent/CN209930127U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113972815A (en) * | 2020-07-24 | 2022-01-25 | 茂睿芯（深圳）科技有限公司 | Dual-channel gate drive circuit and dual-channel gate drive chip |
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Address after: Room 3136, Building C, No. 555, Dongchuan Road, Minhang District, Shanghai, 200241 Patentee after: Shanghai Kunwu Fengdian Technology Co.,Ltd. Address before: Room 201, building 2, 188 Jinxiu Avenue, Yaozhuang Town, Jiashan County, Jiaxing City, Zhejiang Province Patentee before: ZHEJIANG KUNWU TECHNOLOGY Co.,Ltd. |