CN110690683A - Overcurrent protection circuit and overcurrent protection device of intelligent power module - Google Patents
Overcurrent protection circuit and overcurrent protection device of intelligent power module Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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Abstract
The invention provides an overcurrent protection circuit and an overcurrent protection device of an intelligent power module, wherein the overcurrent protection circuit comprises: the first end of the sampling resistor is connected with the output end of a lower bridge arm of the intelligent power module, and the second end of the sampling resistor is grounded; the first end of the first resistor is connected with the first end of the sampling resistor, and the second end of the first resistor is connected with an overcurrent protection trigger voltage port of the intelligent power module; the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with a target voltage; the first end of the third resistor is connected with the first end of the second resistor, and the second end of the third resistor is grounded; the sampling resistor, the first resistor, the second resistor and the third resistor meet the following conditions: when the current of the output end of the lower bridge arm reaches the protection current of the intelligent power module, the voltage of the overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module. The invention can shorten the time from overcurrent to triggering the intelligent power module to carry out overcurrent protection.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an overcurrent protection circuit and an overcurrent protection device of an intelligent power module.
Background
An Intelligent Power Module (IPM) is an advanced Power switch device, which integrates logic, control, detection and protection circuits, and is applied to variable frequency drives, such as air conditioners, washing machines, refrigerators, variable frequency range hoods and the like. The intelligent power module is used as a core component of motor drive, the current value of the intelligent power module is an important parameter, and the intelligent power module is damaged when the current is too large, so that an overcurrent protection circuit needs to be carried out on the intelligent power module.
In the prior art, the voltages at two ends of a sampling resistor are amplified by an operational amplifier, namely, a current signal is converted into a voltage signal, the amplified voltage is compared by a voltage comparator, when the amplified voltage is greater than a set reference voltage, the voltage comparator outputs a high level, and then, an intelligent power module is triggered to perform overcurrent protection.
As can be seen from the above description, in the prior art, the voltage signals at two ends of the sampling resistor need to be processed by the operational amplifier and the voltage comparator, and then input to the intelligent power module, and a long time is required from the occurrence of the overcurrent to the triggering of the intelligent power module for the overcurrent protection.
Disclosure of Invention
The embodiment of the invention provides an overcurrent protection circuit and an overcurrent protection device of an intelligent power module, which can shorten the time from overcurrent to triggering of the intelligent power module for overcurrent protection.
In one aspect, an embodiment of the present invention provides an overcurrent protection circuit for an intelligent power module, including:
the circuit comprises a sampling resistor, a first resistor, a second resistor and a third resistor;
the first end of the sampling resistor is connected with the output end of a lower bridge arm of the intelligent power module, and the second end of the sampling resistor is grounded;
the first end of the first resistor is connected with the first end of the sampling resistor, and the second end of the first resistor is connected with an overcurrent protection trigger voltage port of the intelligent power module;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with a target voltage;
the first end of the third resistor is connected with the first end of the second resistor, and the second end of the third resistor is grounded;
the sampling resistance, the first resistance, the second resistance and the third resistance satisfy:
when the current of the output end of the lower bridge arm reaches the protection current of the intelligent power module, the voltage of the overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module.
Alternatively,
the sampling resistance, the first resistance, the second resistance and the third resistance satisfy:
Vsc1+Vsc2＝Vsc；
wherein r issIs the sampling resistance, r1Is the resistance value of the first resistor, r2Is the resistance value of the second resistor, r3And the resistance value of the third resistor, I is the protection current, Vsc is the overcurrent protection trigger voltage, Vsc1 is a first intermediate variable, Vsc2 is a second intermediate variable, and Vcc is the target voltage.
Alternatively,
the target voltage is a working voltage of a processor controlling the intelligent power module.
Alternatively,
the target voltage is 5v or 3.3 v.
Alternatively,
the resistance value of the sampling resistor is 10 milliohms.
Alternatively,
the first resistor is a variable resistor or a chip resistor.
Alternatively,
the second resistor is a variable resistor or a chip resistor.
Alternatively,
the third resistor is a variable resistor or a chip resistor.
On the other hand, an embodiment of the present invention provides an overcurrent protection device for an intelligent power module, including:
the intelligent power circuit comprises an intelligent power module, a sampling resistor, a first resistor, a second resistor and a third resistor;
the first end of the sampling resistor is connected with the output end of a lower bridge arm of the intelligent power module, and the second end of the sampling resistor is grounded;
the first end of the first resistor is connected with the first end of the sampling resistor, and the second end of the first resistor is connected with an overcurrent protection trigger voltage port of the intelligent power module;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with a target voltage;
the first end of the third resistor is connected with the first end of the second resistor, and the second end of the third resistor is grounded;
the sampling resistance, the first resistance, the second resistance and the third resistance satisfy:
when the current of the output end of the lower bridge arm reaches the protection current of the intelligent power module, the voltage of an overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module;
and the intelligent power module is used for carrying out overcurrent protection when detecting that the voltage value of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage.
Alternatively,
the sampling resistance, the first resistance, the second resistance and the third resistance satisfy:
Vsc1+Vsc2＝Vsc；
wherein r issIs the sampling resistance, r1Is the resistance value of the first resistor，r2Is the resistance value of the second resistor, r3And the resistance value of the third resistor, I is the protection current, Vsc is the overcurrent protection trigger voltage, Vsc1 is a first intermediate variable, Vsc2 is a second intermediate variable, and Vcc is the target voltage.
Alternatively,
this intelligent power module's overcurrent protection device further includes: a processor;
the processor is connected with the intelligent power module;
the intelligent power module is further used for sending a fault signal to the processor when detecting that the voltage value of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage;
and the processor is used for turning off the pulse width modulation control signal of the intelligent power module when the fault signal sent by the intelligent power module is received.
Alternatively,
the intelligent power module is configured to turn off an IGBT (Insulated Gate bipolar transistor) in the intelligent power module when it is detected that the voltage value of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage.
Alternatively,
the target voltage is a working voltage of a processor controlling the intelligent power module.
Alternatively,
the first resistor is a variable resistor or a chip resistor.
Alternatively,
the second resistor is a variable resistor or a chip resistor.
Alternatively,
the third resistor is a variable resistor or a chip resistor.
Alternatively,
the target voltage is 5v or 3.3 v.
Alternatively,
the resistance value of the sampling resistor is 10 milliohms.
In the embodiment of the invention, the whole overcurrent protection circuit is composed of a resistor, devices such as an operational amplifier, a voltage comparator and the like are not needed, voltage signals at two ends of the sampling resistor can be timely reflected to the overcurrent protection trigger voltage port of the intelligent power module, amplification, comparison and other processing are not needed, when overcurrent occurs, the voltage of the overcurrent protection trigger voltage port of the intelligent power module can be timely enabled to reach the overcurrent protection trigger voltage, when the voltage of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage, the intelligent power module is triggered to perform overcurrent protection, and the time from overcurrent occurrence to overcurrent protection triggering of the intelligent power module is shortened.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of an overcurrent protection circuit of an intelligent power module according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an overcurrent protection apparatus of an intelligent power module according to an embodiment of the present invention;
fig. 3 is a circuit diagram of another overcurrent protection apparatus for an intelligent power module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an overcurrent protection circuit of an intelligent power module, including:
sampling resistor RsA first resistor R1A second resistor R2And a third resistor R3；
The sampling resistor RsThe first end of the sampling resistor R is connected with the output end of a lower bridge arm of the intelligent power module, and the sampling resistor RsThe second terminal of (1) is grounded;
the first resistor R1First terminal of and the sampling resistor RsIs connected to the first terminal of the first resistor R1The second end of the intelligent power module is connected with an overcurrent protection trigger voltage port of the intelligent power module;
the second resistor R2And the first resistor R1Is connected to the second terminal of the first resistor R, the second resistor R is connected to the first terminal of the second resistor R2The second terminal of the second diode is connected with a target voltage Vcc;
the third resistor R3First terminal of and the second resistor R2Is connected to the first terminal of the first resistor, the third resistor R3The second terminal of (1) is grounded;
the sampling resistor RsThe first resistor R1The second resistor R2And the third resistor R3Satisfies the following conditions:
when the current of the output end of the lower bridge arm reaches the protection current of the intelligent power module, the voltage of the overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module.
In the embodiment of the invention, the whole overcurrent protection circuit is composed of a resistor, devices such as an operational amplifier, a voltage comparator and the like are not needed, voltage signals at two ends of the sampling resistor can be timely reflected to the overcurrent protection trigger voltage port of the intelligent power module, amplification, comparison and other processing are not needed, when overcurrent occurs, the voltage of the overcurrent protection trigger voltage port of the intelligent power module can be timely enabled to reach the overcurrent protection trigger voltage, when the voltage of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage, the intelligent power module is triggered to perform overcurrent protection, and the time from overcurrent occurrence to overcurrent protection triggering of the intelligent power module is shortened.
In addition, in the embodiment of the invention, the overcurrent protection of the intelligent power module can be realized only by the resistor without components such as an operational amplifier, a voltage comparator and the like, so that the cost is lower.
In an embodiment of the present invention, the sampling resistor, the first resistor, the second resistor, and the third resistor satisfy:
Vsc1+Vsc2＝Vsc；
wherein r issIs the sampling resistance, r1Is the resistance value of the first resistor, r2Is the resistance value of the second resistor, r3And the resistance value of the third resistor, I is the protection current, Vsc is the overcurrent protection trigger voltage, Vsc1 is a first intermediate variable, Vsc2 is a second intermediate variable, and Vcc is the target voltage.
In the embodiment of the invention, the voltage of the overcurrent protection trigger voltage port of the intelligent power module comprises two parts, wherein one part is the divided voltage of the target voltage at the overcurrent protection trigger voltage port, and the other part is the divided voltage of the resistors at the two ends of the sampling resistor at the overcurrent protection trigger voltage port. When the current output by the output end of the lower bridge arm of the intelligent power module is the protection current, the sum of the voltages of the two parts is the overcurrent protection trigger voltage.
When the smart power module determines, the over-current protection trigger voltage Vsc is also determined. The user may determine the protection current according to the load of the smart power module, that is, after the load of the smart power module is determined, the protection current may be determined. The sampling resistance can then be selected as desired, for example: in order to reduce the cost, a sampling resistor having a small resistance value may be selected, and the resistance value of the sampling resistor may range from 1 milliohm to 100 milliohm, and specifically, may range from 5 milliohm, 10 milliohm, 20 milliohm, 50 milliohm, 80 milliohm, and the like. For example, the overcurrent protection trigger voltage is 0.2v, the protection current is 20A, the sampling resistor is 10 milliohms, and the resistance values of the first resistor, the second resistor, and the third resistor can be determined by combining the conditions that the sampling resistor, the first resistor, the second resistor, and the third resistor need to satisfy, for example: the first resistor has a resistance of 10 ohms, the second resistor has a resistance of 24 ohms, and the third resistor has a resistance of 1 ohm.
After determining the overcurrent protection trigger voltage Vsc, the protection current I and the sampling resistor rsThe first resistance, the second resistance, and the third resistance may then be determined according to conditions that the sampling resistance, the first resistance, the second resistance, and the third resistance need to satisfy.
When the overcurrent protection circuit of the intelligent power module is generated, the unified sampling resistor can be used, so that the different protection currents can be satisfied by adjusting the first resistor, the second resistor and the third resistor: when the current of the output end of the lower bridge arm reaches the protection current of the intelligent power module, the voltage of the overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module. Therefore, the sampling resistor does not need to be adjusted, and the generalization of the overcurrent protection circuit of the intelligent power module is facilitated. When the first resistor, the second resistor and the third resistor adopt the chip resistors, the cost of the chip resistors is much lower than that of the sampling resistors, the chip resistors are easy to purchase, the first resistor, the second resistor and the third resistor are adjusted, the sampling resistors are more convenient to adjust, and the cost is lower.
After the sampling resistor is determined, the resistance values of the first resistor, the second resistor and the third resistor are changed, so that the method can be suitable for different protection currents, further can make protection mechanisms with different current protection levels, and is suitable for different frequency conversion products, such as air conditioners, washing machines, range hoods and the like.
In an embodiment of the present invention, the target voltage is an operating voltage for controlling a processor of the smart power module.
Specifically, the processor may be a single chip microcomputer, an FPGA (Field Programmable Gate Array), a microprocessor, or the like. The target voltage is the working voltage of a processor for controlling the intelligent power module, so that a power supply does not need to be provided for the target voltage independently, and the overcurrent protection circuit is more convenient to realize.
Wherein, the target voltage can be 5v or 3.3 v.
In an embodiment of the invention, the first resistor is a variable resistor or a chip resistor.
In an embodiment of the invention, the second resistor is a variable resistor or a chip resistor.
In an embodiment of the invention, the third resistor is a variable resistor or a chip resistor.
In order to reduce the cost, the first resistor, the second resistor and the third resistor may be all chip resistors.
In order to enable the same overcurrent protection circuit to perform overcurrent protection on different protection currents, at least one of the first resistor, the second resistor and the third resistor can be set as a variable resistor, so that when the protection current changes, the voltage of an overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module when the current of the output end of the lower bridge arm reaches the protection current of the intelligent power module by adjusting the variable resistors in the first resistor, the second resistor and the third resistor.
As shown in fig. 2, an embodiment of the present invention provides an overcurrent protection apparatus for an intelligent power module, including:
The sampling resistor RsIs connected with the lower bridge arm output end P1 of the intelligent power module, and the sampling resistor RsThe second terminal of (1) is grounded;
the first resistor R1First terminal of and the sampling resistor RsIs connected to the first end of the first switch, the first switchResistance R1The second end of the intelligent power module is connected with an overcurrent protection trigger voltage port P2 of the intelligent power module;
the second resistor R2And the first resistor R1Is connected to the second terminal of the first resistor R, the second resistor R is connected to the first terminal of the second resistor R2A second terminal of (a) is connected to a target voltage;
the third resistor R3First terminal of and the second resistor R2Is connected to the first terminal of the first resistor, the third resistor R3The second terminal of (1) is grounded;
the sampling resistor RsThe first resistor R1The second resistor R2And the third resistor R3Satisfies the following conditions:
when the current of the output end P1 of the lower bridge arm reaches the protection current of the intelligent power module, the voltage of the overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module;
the intelligent power module is used for performing overcurrent protection when detecting that the voltage value of the overcurrent protection trigger voltage port P2 reaches the overcurrent protection trigger voltage.
In an embodiment of the present invention, the sampling resistor, the first resistor, the second resistor, and the third resistor satisfy:
Vsc1+Vsc2＝Vsc；
wherein r issIs the sampling resistance, r1Is the resistance value of the first resistor, r2Is the resistance value of the second resistor, r3And the resistance value of the third resistor, I is the protection current, Vsc is the overcurrent protection trigger voltage, Vsc1 is a first intermediate variable, Vsc2 is a second intermediate variable, and Vcc is the target voltage.
As shown in fig. 3, in an embodiment of the present invention, the over-current protection device of the smart power module further includes: a processor 301;
the processor 301 is connected with the intelligent power module;
the intelligent power module is further used for sending a fault signal to the processor when detecting that the voltage value of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage;
the processor 301 is configured to turn off the pwm control signal of the smart power module when the fault signal sent by the smart power module is received.
In an embodiment of the present invention, the intelligent power module is configured to turn off an IGBT in the intelligent power module when it is detected that the voltage value of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage.
In an embodiment of the present invention, the target voltage is an operating voltage for controlling a processor of the smart power module.
In an embodiment of the invention, the first resistor is a variable resistor or a chip resistor.
In an embodiment of the invention, the second resistor is a variable resistor or a chip resistor.
In an embodiment of the invention, the third resistor is a variable resistor or a chip resistor.
In an embodiment of the invention, the target voltage is 5v or 3.3 v.
In an embodiment of the invention, the resistance of the sampling resistor is 10 milliohms.
In one embodiment of the invention, the U, V, W three-phase lower bridge arm output ends are connected together.
It should be noted that not all steps and modules in the above flows and system structure diagrams are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The system structure described in the above embodiments may be a physical structure or a logical structure, that is, some modules may be implemented by the same physical entity, or some modules may be implemented by a plurality of physical entities, or some components in a plurality of independent devices may be implemented together.
In the above embodiments, the hardware unit may be implemented mechanically or electrically. For example, a hardware element may comprise permanently dedicated circuitry or logic (such as a dedicated processor, FPGA or ASIC) to perform the corresponding operations. The hardware elements may also comprise programmable logic or circuitry, such as a general purpose processor or other programmable processor, that may be temporarily configured by software to perform the corresponding operations. The specific implementation (mechanical, or dedicated permanent, or temporarily set) may be determined based on cost and time considerations.
While the invention has been shown and described in detail in the drawings and in the preferred embodiments, it is not intended to limit the invention to the embodiments disclosed, and it will be apparent to those skilled in the art that various combinations of the code auditing means in the various embodiments described above may be used to obtain further embodiments of the invention, which are also within the scope of the invention.
Claims (10)
1. An over-current protection circuit of an intelligent power module, comprising:
the circuit comprises a sampling resistor, a first resistor, a second resistor and a third resistor;
the first end of the sampling resistor is connected with the output end of a lower bridge arm of the intelligent power module, and the second end of the sampling resistor is grounded;
the first end of the first resistor is connected with the first end of the sampling resistor, and the second end of the first resistor is connected with an overcurrent protection trigger voltage port of the intelligent power module;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with a target voltage;
the first end of the third resistor is connected with the first end of the second resistor, and the second end of the third resistor is grounded;
the sampling resistance, the first resistance, the second resistance and the third resistance satisfy:
when the current of the output end of the lower bridge arm reaches the protection current of the intelligent power module, the voltage of the overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module.
2. The over-current protection circuit of an intelligent power module according to claim 1,
the sampling resistance, the first resistance, the second resistance and the third resistance satisfy:
Vsc1+Vsc2＝Vsc；
wherein r issIs the sampling resistance, r1Is the resistance value of the first resistor, r2Is the resistance value of the second resistor, r3And the resistance value of the third resistor, I is the protection current, Vsc is the overcurrent protection trigger voltage, Vsc1 is a first intermediate variable, Vsc2 is a second intermediate variable, and Vcc is the target voltage.
3. The over-current protection circuit of an intelligent power module according to claim 1,
the target voltage is a working voltage of a processor controlling the intelligent power module.
4. The over-current protection circuit of a smart power module of any one of claims 1-3,
the target voltage is 5v or 3.3 v;
and/or the presence of a gas in the gas,
the resistance value of the sampling resistor is 10 milliohms;
and/or the presence of a gas in the gas,
the first resistor is a variable resistor or a chip resistor;
and/or the presence of a gas in the gas,
the second resistor is a variable resistor or a chip resistor;
and/or the presence of a gas in the gas,
the third resistor is a variable resistor or a chip resistor.
5. An overcurrent protection device for an intelligent power module, comprising:
the intelligent power circuit comprises an intelligent power module, a sampling resistor, a first resistor, a second resistor and a third resistor;
the first end of the sampling resistor is connected with the output end of a lower bridge arm of the intelligent power module, and the second end of the sampling resistor is grounded;
the first end of the first resistor is connected with the first end of the sampling resistor, and the second end of the first resistor is connected with an overcurrent protection trigger voltage port of the intelligent power module;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with a target voltage;
the first end of the third resistor is connected with the first end of the second resistor, and the second end of the third resistor is grounded;
the sampling resistance, the first resistance, the second resistance and the third resistance satisfy:
when the current of the output end of the lower bridge arm reaches the protection current of the intelligent power module, the voltage of an overcurrent protection trigger voltage port of the intelligent power module reaches the overcurrent protection trigger voltage of the intelligent power module;
and the intelligent power module is used for carrying out overcurrent protection when detecting that the voltage value of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage.
6. The over-current protection device of intelligent power module of claim 5,
the sampling resistance, the first resistance, the second resistance and the third resistance satisfy:
Vsc1+Vsc2＝Vsc；
wherein r issIs the sampling resistance, r1Is the resistance value of the first resistor, r2Is the resistance value of the second resistor, r3And the resistance value of the third resistor, I is the protection current, Vsc is the overcurrent protection trigger voltage, Vsc1 is a first intermediate variable, Vsc2 is a second intermediate variable, and Vcc is the target voltage.
7. The over-current protection device of intelligent power module of claim 5,
further comprising: a processor;
the processor is connected with the intelligent power module;
the intelligent power module is further used for sending a fault signal to the processor when detecting that the voltage value of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage;
and the processor is used for turning off the pulse width modulation control signal of the intelligent power module when the fault signal sent by the intelligent power module is received.
8. The over-current protection device of intelligent power module of claim 5,
and the intelligent power module is used for switching off an Insulated Gate Bipolar Transistor (IGBT) in the intelligent power module when detecting that the voltage value of the overcurrent protection trigger voltage port reaches the overcurrent protection trigger voltage.
9. The over-current protection device of intelligent power module of claim 5,
the target voltage is a working voltage of a processor controlling the intelligent power module.
10. The over-current protection device of the intelligent power module according to any one of claims 5-9,
the first resistor is a variable resistor or a chip resistor;
and/or the presence of a gas in the gas,
the second resistor is a variable resistor or a chip resistor;
and/or the presence of a gas in the gas,
the third resistor is a variable resistor or a chip resistor;
and/or the presence of a gas in the gas,
the target voltage is 5v or 3.3 v;
and/or the presence of a gas in the gas,
the resistance value of the sampling resistor is 10 milliohms.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111751597A (en) * | 2020-06-23 | 2020-10-09 | 四川虹美智能科技有限公司 | Current sampling circuit and motor |
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| CN108306261A (en) * | 2018-01-31 | 2018-07-20 | 广东美的制冷设备有限公司 | Intelligent power module guard method, circuit, readable storage medium storing program for executing and air conditioner |
| CN208433744U (en) * | 2018-02-05 | 2019-01-25 | 珠海格力电器股份有限公司 | Protection circuit of IPM module |
| CN108933552A (en) * | 2018-06-04 | 2018-12-04 | 青岛海尔智能电子有限公司 | Variable-frequency motor current sampling circuit and frequency conversion equipment |
| CN208797862U (en) * | 2018-06-04 | 2019-04-26 | 青岛鼎新电子科技有限公司 | Variable-frequency motor current sampling circuit and frequency conversion equipment |
| CN108923387A (en) * | 2018-06-15 | 2018-11-30 | 珠海格力电器股份有限公司 | Motor protection device, motor and protection method thereof |
| CN208638018U (en) * | 2018-08-08 | 2019-03-22 | 杭州先途电子有限公司 | A kind of controller |
| CN109586624A (en) * | 2018-12-27 | 2019-04-05 | 珠海格力电器股份有限公司 | Motor control device, motor and control method thereof |
| CN110289796A (en) * | 2019-07-19 | 2019-09-27 | 广东美的制冷设备有限公司 | Two-phase-three-phase modulations mode switching circuit and equipment |
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| CN111751597A (en) * | 2020-06-23 | 2020-10-09 | 四川虹美智能科技有限公司 | Current sampling circuit and motor |
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