CN211606083U - Short-circuit protection circuit of IPM circuit, drive circuit and electronic equipment - Google Patents
Short-circuit protection circuit of IPM circuit, drive circuit and electronic equipment Download PDFInfo
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- CN211606083U CN211606083U CN201922100119.7U CN201922100119U CN211606083U CN 211606083 U CN211606083 U CN 211606083U CN 201922100119 U CN201922100119 U CN 201922100119U CN 211606083 U CN211606083 U CN 211606083U
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Abstract
The application discloses a short-circuit protection circuit of an IPM circuit, a drive circuit and an electronic device. The short-circuit protection circuit of the IPM circuit at least comprises: the first detection circuit is connected with the upper bridge arm of the IPM circuit and used for detecting a first current signal of the upper bridge arm of the IPM circuit so as to enable the IPM circuit to be turned off when the first current signal is abnormal. In this way, short-circuit protection of the upper arm of the IPM circuit can be achieved.
Description
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a short-circuit protection circuit, a driving circuit, and an electronic device for an IPM circuit.
Background
In recent years, with the development of the times and the update of national policies, electronic devices such as new energy electric vehicles and industrial robots are pushed to the wave tip of an air opening, the most critical part of the electronic devices is a power system, and the most critical part of the power system is not limited to two parts, namely a motor and an electric drive. An Intelligent Power Module (IPM) is used as a core component of the motor drive, and the safety performance of the IPM plays an important role in the motor drive. The short-circuit protection function is an important part for embodying the safety of the IPM, and the safety of the IPM is whether the short-circuit current can be detected in time and an effective protection action can be made in time.
The inventor of the application finds that the conventional short-circuit protection circuit is connected to a detection circuit on an IPM lower bridge arm to detect the short-circuit current of the IPM lower bridge arm, and then performs a protection action according to the current to achieve the purpose of short-circuit protection in a long-term research and development process. However, the detection circuit can only detect the current flowing through the IPM lower bridge arm, and cannot realize the short-circuit protection of the IPM upper bridge arm.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application mainly solved is: provided are a short-circuit protection circuit, a drive circuit, and an electronic device for an IPM circuit, which can realize short-circuit protection of an upper arm of the IPM circuit.
In order to solve the technical problem, the application adopts a technical scheme that: a short-circuit protection circuit of an IPM circuit is provided. The short-circuit protection circuit includes at least: the first detection circuit is connected with the upper bridge arm of the IPM circuit and used for detecting a first current signal of the upper bridge arm of the IPM circuit so as to turn off the IPM circuit when the first current signal is abnormal.
Wherein the IPM circuit comprises: inverter circuit and control circuit, first detection circuitry includes: the current detection circuit comprises a current detector, a first diode, a first resistor and a first capacitor, wherein a first end of a main inductor of the current detector is connected with a power supply circuit, a second end of the main inductor is connected with an upper bridge arm of the inverter circuit, a first end of an auxiliary inductor of the current detector is connected with an anode of the first diode, a second end of the auxiliary inductor is grounded, a cathode of the first diode is connected with a first end of the first resistor, a first end of the first capacitor and an input end of the control circuit, and a second end of the first resistor and a second end of the first capacitor are both grounded.
Wherein the short circuit protection further comprises: and the second detection circuit is connected with the lower bridge arm of the inverter circuit and the control circuit and is used for detecting a second current signal of the lower bridge arm of the inverter circuit so as to enable the control circuit to turn off the inverter circuit when the second current signal is abnormal.
Wherein the second detection circuit comprises: the first end of the second resistor is connected with the lower bridge arm of the inverter circuit and the first end of the third resistor, the second end of the third resistor is connected with the control circuit, and the second end of the second resistor is grounded.
Wherein the short-circuit protection circuit further comprises: the anode of the second diode is connected with the cathode of the first diode, the cathode of the second diode is connected with the first end of the second resistor, the first end of the second capacitor is connected with the second end of the third resistor, and the second end of the second capacitor is grounded.
Wherein, the inverter circuit includes: the current detector comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, wherein the input end of the first switch tube, the input end of the third switch tube and the input end of the fifth switch tube are connected with the second end of a main inductor of the current detector, the output end of the first switch tube is connected with the input end of the second switch tube, the output end of the third switch tube is connected with the input end of the fourth switch tube, the output end of the fifth switch tube is connected with the input end of the sixth switch tube, the output end of the second switch tube, the output end of the fourth switch tube and the output end of the sixth switch tube are connected with the first end of a second resistor, the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube, the control end of the fourth switch tube, And the control end of the fifth switching tube and the control end of the sixth switching tube are both connected with the control circuit.
In order to solve the technical problem, the application adopts a technical scheme that: a driving circuit is provided. The drive circuit comprises the IPM circuit and short-circuit protection of the IPM circuit.
Wherein the driving circuit further comprises: a bridge rectifier circuit, said bridge rectifier circuit comprising: the negative pole of the third diode and the negative pole of the fifth diode are connected with the first end of the main inductor of the current detector, and the positive pole of the fourth diode and the positive pole of the sixth diode are connected with the second end of the second resistor.
In order to solve the technical problem, the application adopts a technical scheme that: an electronic device is provided. The electronic equipment comprises the driving circuit.
The beneficial effect of this application is: unlike the prior art, the short-circuit protection of the IPM circuit in the embodiment of the present application at least includes: the first detection circuit is connected with the upper bridge arm of the IPM circuit and used for detecting a first current signal of the upper bridge arm of the IPM circuit so as to enable the IPM circuit to be turned off when the first current signal is abnormal. In this way, the short-circuit protection circuit of the IPM circuit in the embodiment of the present application can detect the current signal of the upper arm of the IPM circuit through the first detection circuit, and can turn off the IPM circuit when the current signal of the upper arm is abnormal due to abnormal conditions such as short circuit of the upper arm of the IPM circuit, so as to avoid damage to the IPM circuit and realize short-circuit protection of the upper arm of the IPM circuit.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a driving circuit of the present application;
FIG. 2 is a schematic structural diagram of an embodiment of a driving circuit of the present application;
FIG. 3 is a schematic circuit diagram of an embodiment of a driving circuit of the present application;
FIG. 4 is an equivalent circuit diagram of an application scenario of the driving circuit of the embodiment shown in FIG. 3;
fig. 5 is a schematic circuit diagram of an embodiment of an electronic device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
First, a driving circuit is provided, as shown in fig. 1, where fig. 1 is a schematic structural diagram of an embodiment of the driving circuit. The driving circuit 10 of the present embodiment at least includes: short-circuit protection circuit (not shown) for IPM circuit, wherein the short-circuit protection circuit at least comprises: and a first detection circuit 12, wherein the first detection circuit 12 is connected to the upper arm of the IPM circuit 113, and is configured to detect a first current signal of the upper arm of the IPM circuit 113, so that the IPM circuit 113 is turned off when the first current signal is abnormal.
Different from the prior art, in the short-circuit protection circuit of the IPM circuit 113 of this embodiment, the first detection circuit 12 can detect the current signal of the upper arm of the IPM circuit 113, and can turn off the IPM circuit 113 when the current signal of the upper arm is abnormal due to an abnormal condition such as a short circuit occurring in the upper arm of the IPM circuit 113, so as to avoid damage to the IPM circuit 113 and realize short-circuit protection of the upper arm of the IPM circuit 113.
The IPM circuit 113 includes: an inverter circuit 13 and a control circuit 14; the control circuit 14 is configured to obtain the first current signal from the first detection circuit 12, and compare the first current signal with a preset current signal to determine whether the first current signal is abnormal, for example, if the first current signal is greater than the preset current signal, it is determined that a short circuit occurs in an upper bridge arm of the IPM circuit 113, at this time, the control circuit 14 generates a control instruction, and controls the inverter circuit 13 to be turned off through the control instruction, so as to avoid damage to the IPM circuit 113, and further avoid damage to a motor (not shown).
Optionally, the driving circuit 10 of the present embodiment further includes: a power supply circuit (not shown), the power supply circuit of the present embodiment includes: the rectifier bridge circuit 11 is connected with a single-phase current or a three-phase current, and the rectifier bridge circuit 11 is used for converting the single-phase current or the three-phase current from alternating current to direct current; the inverter circuit 13 is used to invert the dc current into ac current that can be used by a motor (not shown) to drive the motor.
In other embodiments, the power supply circuit may also be a battery.
In another embodiment, as shown in fig. 2, the driving circuit 10 of the present embodiment further includes: the second detection circuit 15, the second detection circuit 15 is connected with lower bridge arm and control circuit 14 of the inverter circuit 13; the second detection circuit 15 is configured to detect a second current signal of a lower arm of the inverter circuit 13, and the control circuit 14 is configured to turn off the inverter circuit 13 when the second current signal is abnormal.
The second detection circuit 15 is configured to detect a second current signal of a lower arm of the inverter circuit 13, and the control circuit 14 is configured to obtain the second current signal from the second detection circuit 15, and compare the second current signal with a preset current signal to determine whether the second current signal is abnormal, for example, if the second current signal is greater than the preset current signal, it is determined that the lower arm of the inverter circuit 13 is short-circuited, at this time, the control circuit 14 generates a control instruction, and controls the inverter circuit 13 to be turned off through the control instruction, so that when the lower arm of the bridge rectifier circuit 11 is short-circuited, the inverter circuit 13 continues to control the motor to operate, so that the IPM circuit (not shown in the figure) is damaged by abnormal current.
On the basis of the above embodiments, the present embodiment can detect the current signal of the lower arm of the IPM circuit by the second detection circuit 15, so as to realize short-circuit protection of the lower arm of the IPM circuit.
Alternatively, as shown in fig. 3, the first detection circuit 12 of the present embodiment includes: the current detection circuit comprises a current detector CT, a first diode D1, a first resistor R1 and a first capacitor C1, wherein a first end of a main inductor (not shown) of the current detector CT is connected with an upper bridge arm of the bridge rectifier circuit 11, a second end of the main inductor is connected with an upper bridge arm of the inverter circuit 13, a first end of a secondary inductor (not shown) of the current detector CT is connected with a positive electrode of the first diode D1, a second end of the secondary inductor is grounded, a negative electrode of the first diode D1 is connected with a first end of a first resistor R1, a first end of a first capacitor C1 and an input end S1 of a control circuit (not shown), and a second end of the first resistor R1 and a second end of the first capacitor C1 are grounded.
The first resistor R1 and the first capacitor C1 are arranged in parallel.
In this embodiment, the current detector CT connected to the upper arm of the inverter circuit 13 is configured to detect a current signal flowing through the upper arm of the inverter circuit 13, when a current signal flows through the upper arm of the inverter circuit 13, the current signal flows through a main inductor of the current detector CT, and after a current signal induced by a secondary inductor of the current detector CT from the main inductor is rectified by the first diode D1, a voltage corresponding to the current signal can be detected at two ends of the first resistor R1. Therefore, the control circuit can obtain the current signal of the first end of the first resistor R1, so as to obtain the current condition of the upper arm of the inverter circuit 13.
In other embodiments, a sampling resistor and an isolation operational amplifier chip may be used instead of the current detector CT of the present embodiment, or a hall current sensor may be used instead of the current detector CT of the present embodiment.
Optionally, the second detection circuit 15 of the present embodiment includes: a second resistor R2 and a third resistor R3, wherein a first end of the second resistor R2 is connected with a lower bridge arm of the inverter circuit 13 and a first end of the third resistor R3, a second end of the third resistor R3 is connected with an input end S1 of the control circuit, and a second end of the second resistor R2 is grounded.
A series circuit connecting the second resistor R2 and the third resistor R3 of the lower arm of the inverter circuit 13 is used to detect a current signal flowing through the lower arm of the inverter circuit 13, and when a current signal flows through the lower arm of the inverter circuit 13, the current signal flows through the second resistor R2 and the third resistor R3, and a voltage corresponding to the current signal can be detected at both ends of the series circuit; the current signal of the second end of the third resistor R3 can be obtained by the control circuit, so that the current condition of the lower bridge arm of the inverter circuit 13 can be obtained.
Optionally, the IPM short-circuit protection circuit (not shown) of this embodiment further includes: the anode of the second diode D2 is connected with the cathode of the first diode D1, the cathode of the second diode D2 is connected with the first end of the second resistor R2, the first end of the second capacitor C2 is connected with the second end of the third resistor R3, and the second end of the second capacitor C2 is grounded.
Wherein a series circuit of the second resistor R2 and the third resistor R3 is provided in parallel with the second diode D2; the second diode D2 is used to prevent the first detection circuit 12 from affecting the second detection circuit 15.
Wherein, the second capacitor C2 can filter the detection signal of the first detection circuit 12 again; a series circuit of the second capacitor C2 and the third resistor R3, which is capable of filtering the detection signal of the second resistor R2, is provided in parallel with the second resistor R2.
In other embodiments, the third resistor may not be provided, and the current signal of the lower arm of the inverter circuit may be directly detected by the second resistor.
Alternatively, the bridge rectifier circuit 11 of the present embodiment includes: a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6, the anode of the third diode D3, the cathode of the fourth diode D4, the anode of the fifth diode D5 and the cathode of the sixth diode D6 are all connected to the mains supply, the cathode of the third diode D3 and the cathode of the fifth diode D5 are connected to a first end of a main inductance of the current detector CT, and the anode of the fourth diode D4 and the anode of the sixth diode D6 are connected to a second end of the second resistor R2.
The bridge rectifier circuit 11 of the present embodiment is a full-wave rectifier circuit, and includes two upper bridge arms and two lower bridge arms. Of course, in other embodiments, the bridge rectifier circuit may also adopt a half-wave rectifier circuit, which is only provided with one path of bridge arm and one path of lower bridge arm; the current detection of the upper and lower bridge arms of the half-wave rectifier circuit is similar to that of the present embodiment, and is not described herein.
Optionally, the inverter circuit 13 of the present embodiment includes: the output end of the fifth switch tube T5 is connected with the input end of the sixth switch tube T6, the output end of the second switch tube T2, the output end of the fourth switch tube T4 and the output end of the sixth switch tube T6 are connected with the first end of a second resistor R2, the control end of the first switch tube T1, the control end of the second switch tube T2, the control end of the fourth switch tube T6353, the control end of the fifth switch tube T828653 and the control end of the fourth switch tube T82 4 are connected with the control end of the fourth switch tube T82 4, the control end of the third switch tube T5 and the control end of the fifth switch tube T82 4, the control end of the third switch tube T1 and the input end of the fifth switch tube T5 are connected with the second end of the main inductor of the current detector CT, the output end of the first switch tube T1 is connected with the input end of the second switch tube T2, the output end of the second switch tube T2 is connected with the input end of the second switch tube T2, the output end of the second switch tube T5827 and the output end of the fifth switch tube T5953 are connected with the control end of the fourth switch tube T8284, The control ends of the sixth switching tubes T6 are all connected with the output end S2 of the control circuit.
Optionally, the IPM circuit 10 of the present embodiment further includes: and the filter circuit 16 is connected with the bridge rectifier circuit 11 and the inverter circuit 13, and the filter circuit 16 is used for filtering a current signal obtained by converting alternating current into direct current of the bridge rectifier circuit 11.
Specifically, the filter circuit 16 of the present embodiment includes a capacitor C3, a first end of the capacitor C3 is connected to the upper arm of the bridge rectifier circuit 11, and a second end of the capacitor C3 is connected to the lower arm of the bridge rectifier circuit 11.
In an application scenario, as shown in fig. 4, the commercial power is a single-phase power, the L phase is a live line, the N phase is a zero line, and when the L phase voltage is greater than the N phase voltage, the upper arm of the bridge rectifier circuit 11 is turned on, and the lower arm of the bridge rectifier circuit 11 is turned off, a path through which a current flows is live line L- > third diode D3- > current detector CT- > first switch tube T1- > zero line N. As can be seen from this path, the short-circuit current directly flows through the main inductor of the current detector CT, and then the secondary inductor detects the current and sends a voltage signal to the input terminal S1 of the control circuit (not shown), when triggering the overcurrent protection threshold of the control circuit, the first switch tube T1 is controlled to be turned off, so as to protect the first switch tube T1 and prevent the first switch tube T1 from supplying power to the motor (not shown).
The present application further provides an IPM short-circuit protection circuit, where the IPM short-circuit protection circuit of this embodiment is the IPM short-circuit protection circuit of the above embodiment, and details are not described here.
The present application further proposes an electronic device, as shown in fig. 5, the electronic device 50 of the present embodiment includes a driving circuit (not shown). The driving circuit is similar to the driving circuit 10, and is not described herein.
Optionally, the electronic device 50 of the present embodiment further includes a motor 51, and an output signal of an output terminal S2 of the control circuit (not shown) controls the first switching tube T1 or the second switching tube T2 to be turned off to turn off the driving of the inverter 13 on the motor 51, controls the third switching tube T3 or the fourth switching tube T4 to be turned off, also can turn off the driving of the inverter 13 on the motor 51, and controls the fifth switching tube T5 or the sixth switching tube T6 to be turned off, also can turn off the driving of the inverter 13 on the motor 61.
Unlike the prior art, the short-circuit protection of the IPM circuit in the embodiment of the present application at least includes: the first detection circuit is connected with the upper bridge arm of the IPM circuit and used for detecting a first current signal of the upper bridge arm of the IPM circuit so as to enable the IPM circuit to be turned off when the first current signal is abnormal. In this way, the short-circuit protection circuit of the IPM circuit in the embodiment of the present application can detect the current signal of the upper arm of the IPM circuit through the first detection circuit, and can turn off the IPM circuit when the current signal of the upper arm is abnormal due to abnormal conditions such as short circuit of the upper arm of the IPM circuit, so as to avoid damage to the IPM circuit and realize short-circuit protection of the upper arm of the IPM circuit.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A short-circuit protection circuit of an IPM circuit, said short-circuit protection circuit comprising at least: the first detection circuit is connected with the upper bridge arm of the IPM circuit and used for detecting a first current signal of the upper bridge arm of the IPM circuit so as to turn off the IPM circuit when the first current signal is abnormal.
2. The short-circuit protection circuit of claim 1, wherein the IPM circuit comprises: inverter circuit and control circuit, first detection circuitry includes: the current detection circuit comprises a current detector, a first diode, a first resistor and a first capacitor, wherein a first end of a main inductor of the current detector is connected with a power supply circuit, a second end of the main inductor is connected with an upper bridge arm of the inverter circuit, a first end of an auxiliary inductor of the current detector is connected with an anode of the first diode, a second end of the auxiliary inductor is grounded, a cathode of the first diode is connected with a first end of the first resistor, a first end of the first capacitor and an input end of the control circuit, and a second end of the first resistor and a second end of the first capacitor are both grounded.
3. The short-circuit protection circuit of claim 2, wherein the short-circuit protection further comprises: and the second detection circuit is connected with the lower bridge arm of the inverter circuit and the control circuit and is used for detecting a second current signal of the lower bridge arm of the inverter circuit so as to enable the control circuit to turn off the inverter circuit when the second current signal is abnormal.
4. The short-circuit protection circuit of claim 3, wherein the second detection circuit comprises: the first end of the second resistor is connected with the lower bridge arm of the inverter circuit and the first end of the third resistor, the second end of the third resistor is connected with the control circuit, and the second end of the second resistor is grounded.
5. The short-circuit protection circuit of claim 4, further comprising: the anode of the second diode is connected with the cathode of the first diode, the cathode of the second diode is connected with the first end of the second resistor, the first end of the second capacitor is connected with the second end of the third resistor, and the second end of the second capacitor is grounded.
6. The short-circuit protection circuit according to claim 4, wherein the inverter circuit comprises: the current detector comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, wherein the input end of the first switch tube, the input end of the third switch tube and the input end of the fifth switch tube are connected with the second end of a main inductor of the current detector, the output end of the first switch tube is connected with the input end of the second switch tube, the output end of the third switch tube is connected with the input end of the fourth switch tube, the output end of the fifth switch tube is connected with the input end of the sixth switch tube, the output end of the second switch tube, the output end of the fourth switch tube and the output end of the sixth switch tube are connected with the first end of a second resistor, the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube, the control end of the fourth switch tube, And the control end of the fifth switching tube and the control end of the sixth switching tube are both connected with the control circuit.
7. A driver circuit, characterized in that the driver circuit comprises: IPM circuit, short circuit protection of IPM circuit according to any of claims 4 to 6.
8. The driving circuit according to claim 7, further comprising: a bridge rectifier circuit, said bridge rectifier circuit comprising: the negative pole of the third diode and the negative pole of the fifth diode are connected with the first end of the main inductor of the current detector, and the positive pole of the fourth diode and the positive pole of the sixth diode are connected with the second end of the second resistor.
9. The driving circuit according to claim 8, further comprising: and the filter circuit is connected with the bridge rectifier circuit and the inverter circuit of the IPM circuit.
10. An electronic device, characterized in that the electronic device comprises a driver circuit according to any of claims 7-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922100119.7U CN211606083U (en) | 2019-11-27 | 2019-11-27 | Short-circuit protection circuit of IPM circuit, drive circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922100119.7U CN211606083U (en) | 2019-11-27 | 2019-11-27 | Short-circuit protection circuit of IPM circuit, drive circuit and electronic equipment |
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| CN211606083U true CN211606083U (en) | 2020-09-29 |
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| CN201922100119.7U Active CN211606083U (en) | 2019-11-27 | 2019-11-27 | Short-circuit protection circuit of IPM circuit, drive circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114597867A (en) * | 2022-04-01 | 2022-06-07 | 杭州利沃得电源有限公司 | Overcurrent protection device and three-phase inverter |
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2019
- 2019-11-27 CN CN201922100119.7U patent/CN211606083U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114597867A (en) * | 2022-04-01 | 2022-06-07 | 杭州利沃得电源有限公司 | Overcurrent protection device and three-phase inverter |
| CN114597867B (en) * | 2022-04-01 | 2023-12-08 | 杭州利沃得电源有限公司 | Overcurrent protection device and three-phase inverter |
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