CN214506867U - Interlocking type full-bridge driving circuit - Google Patents
Interlocking type full-bridge driving circuit Download PDFInfo
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- CN214506867U CN214506867U CN202121082651.1U CN202121082651U CN214506867U CN 214506867 U CN214506867 U CN 214506867U CN 202121082651 U CN202121082651 U CN 202121082651U CN 214506867 U CN214506867 U CN 214506867U
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- bridge arm
- bridge
- arm isolation
- bootstrap
- isolation optocoupler
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Abstract
The utility model relates to a controllable bridge drive circuit, concretely relates to interlocking type full-bridge drive circuit, including the reverse parallelly connected bridge arm isolation module of input, filter circuit, current-limiting module are inserted to bridge arm isolation module's input, and bootstrap charging circuit is connected to bridge arm isolation module's output, and bridge arm isolation module includes that bridge arm keeps apart opto-coupler U4, bridge arm and keeps apart opto-coupler U5, and bridge arm keeps apart opto-coupler U4, bridge arm and keeps apart the input of opto-coupler U5 and connects in reverse parallel; the utility model provides a technical scheme can effectively overcome the direct defect of the unable effective prevention bridge arm that prior art exists.
Description
Technical Field
The utility model relates to a controllable bridge drive circuit, concretely relates to interlocking type full-bridge drive circuit.
Background
The single-phase bridge and the three-phase bridge are common controllable bridge type level conversion circuits, wherein the direct connection of an upper bridge arm and a lower bridge arm is a common and serious circuit fault, so that an effective protection driving circuit is very necessary. If the upper bridge arm and the lower bridge arm are directly connected, the bridge arms are short-circuited, a large short-circuit current is formed, and the switch tube is damaged or even explodes.
The straight-through of the upper and lower bridge arms is caused by the following reasons: the digital processing chips such as the DSP or the MCU and the like are influenced by the working stability of the power supply to cause program operation errors and generate wrong drive control signals; wiring from the DSP or the MCU to the low-voltage side of the driving optocoupler can be interfered by other signals to generate wrong driving control signals; the driving optocoupler can cause the condition of signal transmission delay increase due to high-temperature aging, so that the transmission signals of the upper bridge arm and the lower bridge arm are inconsistent.
At present, the direct connection problem of upper and lower bridge arms is mainly solved by detecting the current or voltage drop of the IGBT to judge the short-circuit current and realizing direct connection locking by turning off the short-circuit IGBT. However, in this way, the fault is cut off in case a shoot-through fault has occurred, and the IGBT will experience a short-circuit current for a certain time, which will significantly reduce the lifetime of the IGBT.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
To the above-mentioned shortcoming that prior art exists, the utility model provides an interlocking type full-bridge drive circuit can effectively overcome the direct defect of the unable effective prevention bridge arm that prior art exists.
(II) technical scheme
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
the interlocking type full-bridge driving circuit comprises bridge arm isolation modules with input ends connected in reverse parallel, wherein the input ends of the bridge arm isolation modules are connected into a filter circuit and a current limiting module, and the output ends of the bridge arm isolation modules are connected with a bootstrap charging circuit.
Preferably, the bridge arm isolation module comprises a bridge arm isolation optocoupler U4 and a bridge arm isolation optocoupler U5, and input ends of the bridge arm isolation optocoupler U4 and the bridge arm isolation optocoupler U5 are connected in parallel in an opposite direction.
Preferably, the bootstrap charging circuit includes a bootstrap hold capacitor C1 and a bootstrap hold capacitor C2 connected in parallel between output ends of the bridge arm isolation optocoupler U4, a bootstrap charging current-limiting resistor R8 connected to an output end of the bridge arm isolation optocoupler U4, and a bootstrap charging protection diode D4;
the bootstrap charging circuit further comprises a bootstrap hold capacitor C3 and a bootstrap hold capacitor EC44 which are connected in parallel between the output ends of the bridge arm isolation optocoupler U5, a bootstrap charging current-limiting resistor R7 connected with the output end of the bridge arm isolation optocoupler U5, and a bootstrap charging protection diode D5.
Preferably, the filter circuit comprises a filter resistor R32 and a filter capacitor C84 which are connected in parallel between the input ends of the bridge arm isolation optocoupler U4 and the bridge arm isolation optocoupler U5.
Preferably, the current limiting module comprises a current limiting resistor R27 and a current limiting resistor R28.
(III) advantageous effects
Compared with the prior art, the utility model provides an interlocking type full-bridge drive circuit utilizes circuit design for the drive signal of upper and lower bridge arm locks each other, only has corresponding drive level output when one of them drive signal is high, consequently can not appear the straight through drive signal of upper and lower bridge arm, effectively avoids the straight through of upper and lower bridge arm because of drive signal unusual leads to; the signal end and the high-voltage power end of the controllable bridge driving circuit are isolated by the isolating optocoupler, so that mutual interference at the two ends can be reduced, the complexity of the circuit is reduced, and meanwhile, protection isolation is provided for the signal end and the high-voltage power end.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
An interlocking full-bridge driving circuit is shown in fig. 1 and comprises bridge arm isolation modules with input ends connected in reverse parallel, wherein the input ends of the bridge arm isolation modules are connected with a filter circuit and a current limiting module, and the output ends of the bridge arm isolation modules are connected with a bootstrap charging circuit.
The bridge arm isolation module comprises a bridge arm isolation optocoupler U4 and a bridge arm isolation optocoupler U5, wherein the input ends of the bridge arm isolation optocoupler U4 and the bridge arm isolation optocoupler U5 are reversely connected in parallel.
The bootstrap charging circuit comprises a bootstrap hold capacitor C1 and a bootstrap hold capacitor C2 which are connected in parallel between the output ends of the bridge arm isolation optocoupler U4, a bootstrap charging current-limiting resistor R8 connected with the output end of the bridge arm isolation optocoupler U4, and a bootstrap charging protection diode D4;
the bootstrap charging circuit further comprises a bootstrap hold capacitor C3 and a bootstrap hold capacitor EC44 which are connected in parallel between the output ends of the bridge arm isolation optocoupler U5, a bootstrap charging current-limiting resistor R7 connected with the output end of the bridge arm isolation optocoupler U5, and a bootstrap charging protection diode D5.
The filter circuit comprises a filter resistor R32 and a filter capacitor C84 which are connected in parallel between the input ends of the bridge arm isolation optocoupler U4 and the bridge arm isolation optocoupler U5.
The current limiting module comprises a current limiting resistor R27 and a current limiting resistor R28.
As shown in fig. 1, since the input ends of the bridge arm isolating optocoupler U4 and the bridge arm isolating optocoupler U5 are connected in parallel in an inverted manner, the driving signals WDrU1 and WDrD1 of the upper and lower bridge arms can be locked with each other, and only when one of the driving signals is high, the corresponding driving level is output, so that a driving signal for straight-through of the upper and lower bridge arms does not occur, and straight-through of the upper and lower bridge arms caused by abnormal driving signals is effectively avoided.
In addition, the signal end and the high-voltage power end of the controllable bridge driving circuit are isolated by the bridge arm isolation optocoupler U4 and the bridge arm isolation optocoupler U5, so that mutual interference between the two ends can be reduced, the complexity of the circuit is reduced, and meanwhile, protection isolation is provided for the signal end and the high-voltage power end.
In the technical scheme of the application, the bridge arm isolation optocoupler U4 and the bridge arm isolation optocoupler U5 can adopt a tlp155e coupler; the filter circuit can filter out high-frequency spikes and reduce signal interference; the current limiting resistor R27 and the current limiting resistor R28 can provide appropriate optical coupler driving current for the bridge arm isolation optical coupler U4 and the bridge arm isolation optical coupler U5. In addition, in the bridge circuit, each bridge arm needs a set of the above-mentioned interlock type full bridge driving circuit.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. An interlocking full-bridge driving circuit, characterized in that: the bridge arm isolation circuit comprises bridge arm isolation modules with input ends connected in reverse parallel, wherein the input ends of the bridge arm isolation modules are connected with a filter circuit and a current limiting module, and the output ends of the bridge arm isolation modules are connected with a bootstrap charging circuit.
2. The interlock type full bridge driving circuit according to claim 1, wherein: the bridge arm isolation module comprises a bridge arm isolation optocoupler U4 and a bridge arm isolation optocoupler U5, wherein the input ends of the bridge arm isolation optocoupler U4 and the bridge arm isolation optocoupler U5 are reversely connected in parallel.
3. The interlock type full bridge driving circuit according to claim 2, wherein: the bootstrap charging circuit comprises a bootstrap hold capacitor C1 and a bootstrap hold capacitor C2 which are connected in parallel between the output ends of the bridge arm isolation optocoupler U4, a bootstrap charging current-limiting resistor R8 connected with the output end of the bridge arm isolation optocoupler U4, and a bootstrap charging protection diode D4;
the bootstrap charging circuit further comprises a bootstrap hold capacitor C3 and a bootstrap hold capacitor EC44 which are connected in parallel between the output ends of the bridge arm isolation optocoupler U5, a bootstrap charging current-limiting resistor R7 connected with the output end of the bridge arm isolation optocoupler U5, and a bootstrap charging protection diode D5.
4. The interlock type full bridge driving circuit according to claim 2, wherein: the filter circuit comprises a filter resistor R32 and a filter capacitor C84 which are connected in parallel between the input ends of a bridge arm isolation optocoupler U4 and a bridge arm isolation optocoupler U5.
5. The interlock type full bridge driving circuit according to claim 4, wherein: the current limiting module comprises a current limiting resistor R27 and a current limiting resistor R28.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121082651.1U CN214506867U (en) | 2021-05-20 | 2021-05-20 | Interlocking type full-bridge driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121082651.1U CN214506867U (en) | 2021-05-20 | 2021-05-20 | Interlocking type full-bridge driving circuit |
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| CN214506867U true CN214506867U (en) | 2021-10-26 |
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| CN202121082651.1U Active CN214506867U (en) | 2021-05-20 | 2021-05-20 | Interlocking type full-bridge driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113241934A (en) * | 2021-05-20 | 2021-08-10 | 安徽智纳智能装备有限公司 | Interlocking type full-bridge driving circuit |
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2021
- 2021-05-20 CN CN202121082651.1U patent/CN214506867U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113241934A (en) * | 2021-05-20 | 2021-08-10 | 安徽智纳智能装备有限公司 | Interlocking type full-bridge driving circuit |
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