CN219392160U - Driving phase current sampling circuit, fault detection circuit and direct current fan - Google Patents
Driving phase current sampling circuit, fault detection circuit and direct current fan Download PDFInfo
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- CN219392160U CN219392160U CN202223022436.XU CN202223022436U CN219392160U CN 219392160 U CN219392160 U CN 219392160U CN 202223022436 U CN202223022436 U CN 202223022436U CN 219392160 U CN219392160 U CN 219392160U
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Abstract
The utility model provides a driving phase current sampling circuit, a fault detection circuit and a direct current fan, wherein the circuit comprises an IPM module, a current detection module and an operational amplifier circuit module; the IPM module comprises a U, V, W phase current output pin and NU, NV and NW phase current negative terminal pins; the current sampling resistor is connected between the NU phase current negative terminal pin and the ground, and between the NV phase current negative terminal pin and the ground; the signal input end of the first operational amplifier circuit is connected between the NU phase current negative terminal pin and the current sampling resistor, and the signal input end of the second operational amplifier circuit is connected between the NV phase current negative terminal pin and the current sampling resistor; the signal output ends of the first operational amplifier circuit and the second operational amplifier circuit are connected to the processing element, the two-phase current is detected U, V by adopting the double-resistance sampling circuit and the operational amplifier circuit, and the W-phase current is obtained through calculation, so that the number of components is reduced, the complexity of the circuit is reduced, and the reliability and the efficiency are improved.
Description
Technical Field
The utility model relates to the technical field of current detection, in particular to a driving phase current sampling circuit, a fault detection circuit and a direct current fan.
Background
The existing direct current fan circuit phase current sampling generally adopts a three-resistor sampling circuit to detect three-phase current, and the three-resistor sampling circuit needs three groups of sampling resistors and three paths of operational amplifier circuits, so that the direct current fan circuit has the advantages of more components, complex circuits and low reliability and efficiency.
Disclosure of Invention
In order to solve the above problems, the present utility model provides a driving phase current sampling circuit, which includes an IPM module, a current detection module and an operational amplifier module; the IPM module comprises a U, V, W phase current output pin and NU, NV and NW phase current negative terminal pins; the current detection circuit module comprises two current sampling resistors, and each current sampling resistor is respectively connected between the NU phase current negative terminal pin and the ground, and between the NV phase current negative terminal pin and the ground; the operational amplifier circuit module comprises a first operational amplifier circuit and a second operational amplifier circuit; the signal input end of the first operational amplifier circuit is connected between the NU phase current negative terminal pin and the current sampling resistor, and the signal input end of the second operational amplifier circuit is connected between the NV phase current negative terminal pin and the current sampling resistor; the signal output ends of the first operational amplifier circuit and the second operational amplifier circuit are connected to the processing element, so that the processing element detects U, V two-phase current and calculates W-phase current.
The driving phase current sampling circuit provided by the embodiment of the utility model adopts the double-resistance sampling circuit and the operational amplifier circuit to detect U, V two-phase current, and the W-phase current is obtained through calculation, so that the number of components is reduced, the complexity of the circuit is reduced, and the reliability and the efficiency are improved.
Optionally, the device further comprises a voltage detection module; the voltage detection module comprises two voltage sampling resistors, and the voltage sampling resistors are connected with the current sampling resistors in parallel.
Based on the voltage sampling resistor, the embodiment of the utility model detects the voltages at two ends of the voltage sampling resistor when the IPM module works normally, thereby detecting and obtaining U, V two-phase voltage.
Optionally, the device further comprises a hardware overcurrent protection circuit; the sampling end of the hardware overcurrent protection circuit is connected between the current sampling resistor and the ground, and the output end of the hardware overcurrent protection circuit is connected with the hardware protection pin of the IPM module.
The embodiment of the utility model is also provided with a hardware overcurrent protection circuit, thereby playing a role in protecting the hardware overcurrent of the IPM module.
Optionally, the device further comprises a program overcurrent protection circuit; the input end of the program overcurrent protection circuit is connected with the fault output pin of the IPM module, and the output end of the program overcurrent protection circuit is connected with the controller and used for outputting a fault signal to the controller.
The embodiment of the utility model also comprises a program overcurrent protection circuit, thereby achieving the overcurrent protection effect.
Optionally, the current detection module further comprises a first resistor and a second resistor connected in parallel; the first resistor and the second resistor are connected between the current sampling resistor and the ground.
The embodiment of the utility model is also provided with the first resistor and the second resistor, so that the current-limiting protection function can be realized.
Optionally, the IPM module further includes three groups of bootstrap capacitors; each group of bootstrap capacitors is respectively connected between the U, V, W phase current output pin and the corresponding U, V, W phase IGBT driven high-end auxiliary power supply pin.
The embodiment of the utility model is also provided with a bootstrap circuit, thereby realizing voltage bootstrap.
Optionally, the U, V, W phase current output pins are each connected to a wire-to-board connector.
The embodiment of the utility model is also provided with a wire-to-board connector air supply machine, a press machine and the like which are connected to play a role in supplying power to the equipment.
Optionally, the first operational amplifier circuit and the second operational amplifier circuit respectively include comparators.
In the embodiment of the utility model, the operational amplifier function is realized through the comparator and the related circuit.
The utility model provides a fault detection circuit which comprises the driving phase current sampling circuit and the processing element, wherein the IPM module is controlled to stop working under the condition that the three-phase current output by the processing element exceeds a threshold value.
The utility model provides a direct current fan which comprises the fault detection circuit.
The fault detection circuit and the direct current fan provided by the utility model can achieve the same technical effect as the driving phase current sampling circuit.
Drawings
FIG. 1 is a schematic diagram of an IPM module and a current-voltage detection module of a driving phase current sampling circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a bootstrap circuit of an IPM module for driving a phase current sampling circuit according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of an operational amplifier circuit of a driving phase current sampling circuit according to an embodiment of the present utility model.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Aiming at the problems of more components and complex circuits of the existing three-resistor sampling circuit, a double-resistor sampling circuit is designed, and UV two-phase currents are respectively sampled through two groups of sampling resistors. The sampling circuit comprises an IPM module, two paths of sampling resistors and two paths of operational amplifier circuits. The current is not detected when the IPM module is started, the voltage at two ends of the sampling resistor is detected during normal operation, and U, V two-phase current is detected through the operational amplifier circuit. The W-phase current is obtained by calculation (three-phase current sum is zero). In addition, hardware overcurrent protection and program overcurrent protection are also provided. The scheme has accurate phase current sampling, fewer components and parts and improved efficiency.
The embodiment of the utility model provides a driving phase current sampling circuit which comprises an IPM (Intelligent Power Module ) module, a current detection module and an operational amplifier circuit module. The driving phase current sampling circuit is used for collecting the running states (including normal running, locked-rotor, phase-failure and the like) of the fan, the press and the like, when abnormal large current is detected, a trigger signal is sent to the control chip, and the control chip turns off the signal for driving the IPM module, so that the fan, the press and the like stop running, and the purpose of overcurrent protection is achieved.
The IPM module is suitable for a frequency converter of a driving motor and various inverter power supplies, and is an ideal power electronic device of a frequency conversion household appliance. Specifically, the IPM module includes U, V, W phase current output pins and NU, NV, NW phase current negative terminal pins. The U, V, W phase current output pin is three-phase current output and is used for supplying power to the direct current fan and the direct current press.
The current detection circuit module comprises two current sampling resistors, wherein each current sampling resistor is respectively connected between the NU phase current negative terminal pin and the ground, and between the NV phase current negative terminal pin and the ground. The current sampling resistor is a resistor with smaller resistance value and is connected in series. In this embodiment, only U, V two-phase current can be detected, so that the purposes of simplifying the circuit and reducing the cost are achieved.
The operational amplifier circuit module comprises a first operational amplifier circuit and a second operational amplifier circuit. Specifically, the signal input end of the first operational amplifier circuit is connected between the NU phase current negative terminal pin and the current sampling resistor, and the signal input end of the second operational amplifier circuit is connected between the NV phase current negative terminal pin and the current sampling resistor;
the signal output ends of the first operational amplifier circuit and the second operational amplifier circuit are connected to the processing element, so that the processing element detects U, V two-phase current and calculates W-phase current.
The driving phase current sampling circuit provided by the embodiment of the utility model adopts the double-resistance sampling circuit and the operational amplifier circuit to detect U, V two-phase current, and the W-phase current is obtained through calculation, so that the number of components is reduced, the complexity of the circuit is reduced, and the reliability and the efficiency are improved.
As a possible way, the driving phase current sampling circuit further includes a voltage detection module; the voltage detection module comprises two voltage sampling resistors which are connected in parallel with the current sampling resistor. The voltage sampling resistor is a resistor with larger resistance value and is connected in parallel, and based on the voltage sampling resistor, the voltage at two ends of the voltage sampling resistor is detected when the IPM module normally works, so that U, V two-phase voltage is obtained through detection.
As a possible way, the driving phase current sampling circuit further includes a hardware overcurrent protection circuit; the sampling end of the hardware overcurrent protection circuit is connected between the current sampling resistor and the ground, and the output end of the hardware overcurrent protection circuit is connected with a hardware protection pin (CSC) of the IPM module. And the hardware protection pin of the IPM module stops working when the voltage input by the pin is larger than the threshold value. For example, a small non-inductive resistor may be connected to the hardware overcurrent protection circuit, if the current of a certain phase is greater than the threshold value, the voltage of the phase is greater than the threshold value, and is applied to the CSC pin, so that the IPM module stops working, thereby playing a role in protecting the hardware overcurrent of the IPM module.
As a possible way, the driving phase current sampling circuit further includes a program overcurrent protection circuit; the input end of the program overcurrent protection circuit is connected with a fault output pin (FO) of the IPM module, and the output end of the program overcurrent protection circuit is connected with the controller and is used for outputting a fault signal to the controller. If the fault exists, the FO pin outputs a low-level signal, the low-level signal is transmitted to the singlechip through the program overcurrent protection circuit, and the singlechip turns off the 6-path control signal for driving the IPM module, so that the IPM module stops running, and the overcurrent protection effect is achieved.
As a possible way, the current detection module further includes a first resistor and a second resistor connected in parallel; the first resistor and the second resistor are connected between the current sampling resistor and the ground. The first resistor and the second resistor can play a role in current limiting protection.
As a possible way, the IPM module further includes three groups of bootstrap capacitors; each group of bootstrap capacitors is respectively connected between the U, V, W phase current output pin and the corresponding U, V, W phase IGBT driven high-end auxiliary power supply pin. The outside of the 6 pins is connected with 3 groups of bootstrap capacitors, namely, the voltage bootstrap is realized by utilizing the characteristic that the voltage at two ends of the capacitor cannot be suddenly changed instantaneously to change the instantaneous voltage at a certain point by utilizing the fact that the circuit generates higher voltage than the input voltage.
As a possible way, the U, V, W phase current output pins are all connected to a wire-to-board connector, which can be connected to a fan, a press, etc., to supply power to the above-mentioned devices.
Optionally, the first operational amplifier circuit and the second operational amplifier circuit respectively include a comparator, and the operational amplifier function is mainly realized through the comparator and the related circuits.
Exemplary, fig. 1 shows a schematic structural diagram of an IPM module and a current-voltage detection module of a driving phase current sampling circuit according to an embodiment of the present utility model. In fig. 1, it is shown that the IPM module includes U, V, W phase current output pins, NU, NV, NW phase current negative terminal pins, VBU, VBV, VBW phase IGBT driven high side auxiliary power supply pins, direct current input positive terminal pin P (310V), power supply pin VCCW (15V), hardware protection pin CSC, fault output pin FO.
The NU pins and the NV pins are connected with sampling resistors and are grounded after passing through protection resistors. An access point of a detection circuit is arranged at the sampling resistor, so that current and voltage can be detected. As shown in fig. 1, the resistors R108, R43, R109, R46, R57, and R110 are included. The CSC pin is connected with the NU pin and the NV pin through a hardware overcurrent protection circuit, and comprises resistors R185 and R102 and a capacitor C50. The FO pin connection program overcurrent protection circuit comprises resistors R100 and R104, capacitors C99 and C52, and an output terminal F-FO is connected with the controller.
Fig. 2 is a schematic structural diagram of a bootstrap circuit of an IPM module of a driving phase current sampling circuit according to an embodiment of the present utility model. The pin VBU is connected with the pin U through the electrolytic capacitor E17 and the capacitor C89, the pin VBV is connected with the pin V through the electrolytic capacitor E18 and the capacitor C90, and the pin VBW is connected with the pin W through the electrolytic capacitor E19 and the capacitor C91. Also shown in fig. 2 are U, V, W phase current output pins that are each connected to a wire-to-board connector DC-M.
Fig. 3 is a schematic diagram of an operational amplifier circuit of a driving phase current sampling circuit according to an embodiment of the present utility model. Fig. 3 shows an operational amplifier circuit corresponding to U, V phase current, which includes comparators U71 and U7B, resistors R112, R113, R115, R116, R117, R118, R119, R120, R121, R122, R123, R124, and capacitors C63 and C64, respectively.
In this circuit, the IPM module operates at a supply voltage of 15VDC and controls at a voltage of 310VDC. When the IPM module is started, bootstrap capacitors E17, E18 and E19 are charged, fan starting current passes through R57 and R110 to the ground, and the output voltages FIV-AD and FIU-AD of the operational amplifier circuit are about 3.2V with higher level, and the operational amplifier output is not adopted by the program. After the normal operation is carried out, the on-off of the upper bridge and the lower bridge is controlled U, V, W through software, the voltages at the FIV and the FIU are respectively collected, the voltages are amplified by an operational amplifier circuit (R121 and R122 provide a reference of 1.65V), the operational amplifier outputs the voltages FIV-AD and FIU-AD to the single chip microcomputer for processing control, and U, V two-phase current is detected. The W-phase current is obtained by calculation (three-phase current sum is zero). SC is hardware over-current protection. F-FO is the detection of the working state of the IPM module.
The circuit provided by the embodiment can detect whether the direct current fan circuit has faults or not; the method can be applied to the scenes of using the direct current fan and the direct current press; the circuit phase current sampling is accurate, components and parts are reduced, the cost is reduced, and the production efficiency is improved.
The embodiment realizes the detection of the working current of the direct current fan, and can effectively judge whether the direct current fan and the driving current have faults or not; the double-resistance sampling circuit reduces the complexity of the circuit and improves the reliability; a DC fan fault detection circuit based on a comparator is provided.
The embodiment of the utility model also provides a fault detection circuit which comprises the driving phase current sampling circuit and the processing element, and the IPM module is controlled to stop working under the condition that the three-phase current output by the processing element exceeds a threshold value.
The embodiment of the utility model also provides a direct current fan, which comprises the fault detection circuit.
Of course, it will be appreciated by those skilled in the art that implementing all or part of the above-described methods in the embodiments may be implemented by a computer level to instruct a control device, where the program may be stored in a computer readable storage medium, and the program may include the above-described methods in the embodiments when executed, where the storage medium may be a memory, a magnetic disk, an optical disk, or the like.
Although the present utility model is disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the present utility model is disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.
Claims (10)
1. The driving phase current sampling circuit is characterized by comprising an IPM module, a current detection module and an operational amplifier circuit module;
the IPM module comprises a U, V, W phase current output pin and NU, NV and NW phase current negative terminal pins;
the current detection module comprises two current sampling resistors, and each current sampling resistor is respectively connected between the NU phase current negative terminal pin and the ground, and between the NV phase current negative terminal pin and the ground; the operational amplifier circuit module comprises a first operational amplifier circuit and a second operational amplifier circuit; the signal input end of the first operational amplifier circuit is connected between the NU phase current negative terminal pin and the current sampling resistor, and the signal input end of the second operational amplifier circuit is connected between the NV phase current negative terminal pin and the current sampling resistor;
the signal output ends of the first operational amplifier circuit and the second operational amplifier circuit are connected to the processing element, so that the processing element detects U, V two-phase current and calculates W-phase current.
2. The drive phase current sampling circuit of claim 1, further comprising a voltage detection module;
the voltage detection module comprises two voltage sampling resistors, and the voltage sampling resistors are connected with the current sampling resistors in parallel.
3. The drive phase current sampling circuit of claim 1, further comprising a hardware over-current protection circuit;
the sampling end of the hardware overcurrent protection circuit is connected between the current sampling resistor and the ground, and the output end of the hardware overcurrent protection circuit is connected with the hardware protection pin of the IPM module.
4. The drive phase current sampling circuit of claim 1, further comprising a program over-current protection circuit;
the input end of the program overcurrent protection circuit is connected with the fault output pin of the IPM module, and the output end of the program overcurrent protection circuit is connected with the controller and used for outputting a fault signal to the controller.
5. The drive phase current sampling circuit according to any one of claims 1 to 4, wherein the current detection module further comprises a first resistor and a second resistor connected in parallel; the first resistor and the second resistor are connected between the current sampling resistor and the ground.
6. The drive phase current sampling circuit of any one of claims 1-4, wherein the IPM module further comprises three sets of bootstrap capacitors; each group of bootstrap capacitors is respectively connected between the U, V, W phase current output pin and the corresponding U, V, W phase IGBT driven high-end auxiliary power supply pin.
7. The drive phase current sampling circuit of any one of claims 1 to 4 wherein said U, V, W phase current output pins are each connected to a wire-to-board connector.
8. The drive phase current sampling circuit according to any one of claims 1 to 4, wherein the first operational amplifier circuit and the second operational amplifier circuit each include a comparator.
9. A fault detection circuit comprising the drive phase current sampling circuit of any one of claims 1-8 and the processing element, wherein the IPM module is controlled to stop operating if the three-phase current output by the processing element exceeds a threshold.
10. A direct current fan comprising the fault detection circuit of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223022436.XU CN219392160U (en) | 2022-11-11 | 2022-11-11 | Driving phase current sampling circuit, fault detection circuit and direct current fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223022436.XU CN219392160U (en) | 2022-11-11 | 2022-11-11 | Driving phase current sampling circuit, fault detection circuit and direct current fan |
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| Publication Number | Publication Date |
|---|---|
| CN219392160U true CN219392160U (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223022436.XU Active CN219392160U (en) | 2022-11-11 | 2022-11-11 | Driving phase current sampling circuit, fault detection circuit and direct current fan |
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| CN (1) | CN219392160U (en) |
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- 2022-11-11 CN CN202223022436.XU patent/CN219392160U/en active Active
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