Si Hall magnetic switch and IPM detection system based on Si Hall magnetic switch
By designing the Si Hall magnetic switch, the problem of performance degradation of Insb Hall elements at high temperatures is solved, achieving stable output and cost reduction, making it suitable for IPM detection systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-03-20
AI Technical Summary
Existing Insb linear Hall effect sensors exhibit performance degradation at high temperatures, leading to unstable output signals, reduced accuracy, and higher costs.
The Si Hall magnetic switch is adopted, including an oscillator, Hall block, Hall signal processing unit, hysteresis comparison unit, reference processing module and output processing module, and a reference port is added for use in IPM detection system. It outputs high and low levels and reference voltage, and is suitable for high temperature environment.
It provides stable and reliable output results at high temperatures, has a low cost, and is suitable for IPM detection systems, replacing Insb Hall elements.
Smart Images
Figure CN224021607U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor detection technical field more particularly to a kind of Si Hall magnetic switch and IPM detection system based on Si Hall magnetic switch. BACKGROUND
[0002] IPM (Intelligent Power Module, intelligent power module) is mainly used to control motor, and the position signal of motor rotor magnetic pole is detected by position magnetic sensor, and the signal is sent into the LOGIC (Logic, logic processing) module of IPM after being converted into electric signal, and the control signal is outputted after the signal is processed by LOGIC module, and the commutation of motor stator winding is controlled, and the permanent-magnet rotor is continuously rotated.
[0003] The traditional IPM detects motor rotor position by Insb (indium antimonide) linear Hall element, and the differential voltage of two outputs of Insb Hall element rises with the increase of magnetic flux, that is, the differential output voltage is greater when the rotor magnetic pole is closer to Insb Hall element. After the two outputs of Insb Hall element are compared by the internal comparator of IPM, the comparison result is obtained, and the rotor position information is obtained by inputting the comparison result into the LOGIC module of IPM.
[0004] The sensitivity of Insb linear Hall element is high, and the linearity is good, but it cannot be used at high temperature (above 110 DEG C), because Insb linear Hall element may face the problem of sharp performance decline or even failure at high temperature, the sensitivity is directly affected by high temperature, resulting in unstable output signal and reduced accuracy, and the cost of Insb linear Hall element is relatively high. SUMMARY
[0005] In view of the defects in the prior art, the utility model provides a kind of Si Hall magnetic switch and IPM detection system based on Si Hall magnetic switch to reduce cost, and more stable and accurate output result is obtained.
[0006] The utility model provides a kind of Si Hall magnetic switch, with power port, ground port, output port and reference port, the Si Hall magnetic switch includes oscillator, hall block, hall signal processing unit, hysteresis comparison unit, reference processing module and output processing module, the oscillator is connected with the hall block, the hall signal processing unit, the hysteresis comparison unit and the reference processing module respectively, the hall block, the hall signal processing unit and the hysteresis comparison unit are sequentially connected, and the hysteresis comparison unit is connected with output processing module.
[0007] Further, the output end of the reference processing module forms the reference port of the Si Hall magnetic switch, and the output end of the output processing module forms the output port of the Si Hall magnetic switch.
[0008] Further, the oscillator, the Hall block, the Hall signal processing unit, the hysteresis comparison unit, the reference processing module and the output processing module are grounded, and the port for grounding forms a ground port of the Si Hall magnetic switch.
[0009] Further, the oscillator, the Hall block, the Hall signal processing unit, the hysteresis comparison unit and the reference processing module are connected with a power supply, and the port for connecting the power supply forms a power port of the Si Hall magnetic switch.
[0010] Further, the output processing module is connected with the power supply, and an internal power voltage value of the Si Hall magnetic switch is a voltage value of the power supply.
[0011] Further, the reference processing module adopts a low dropout linear regulator, the output processing module is connected with the low dropout linear regulator, and an internal power voltage value of the Si Hall magnetic switch is an output voltage value of the low dropout linear regulator.
[0012] The utility model also provides a kind of IPM detection system based on Si Hall magnetic switch, including the Si Hall magnetic switch and IPM of described, the Si Hall magnetic switch is installed on the stator of motor to be detected, and the output port and reference port of the Si Hall magnetic switch are all connected to the IPM.
[0013] Further, the Si Hall magnetic switch is provided as:
[0014] The reference port keeps output reference voltage throughout;
[0015] When detecting that the N-pole magnetic pole of motor rotor is close, the output port outputs high level;When detecting that the N-pole magnetic pole of motor rotor is far away, the output port outputs low level;Or,
[0016] When detecting that the N-pole magnetic pole of motor rotor is close, the output port outputs low level;When detecting that the N-pole magnetic pole of motor rotor is far away, the output port outputs high level.
[0017] Further, the high level value output by the output port is internal power voltage value of Si Hall magnetic switch, and the low level output by the output port is ground voltage;The reference voltage value output by the reference port is half of the high level value output by the output port, or is any fixed value.
[0018] Further, the IPM is provided as:
[0019] The IPM receives the output level from the output port and the reference voltage from the reference port, compares the output level and the reference voltage through a comparator, and transmits the comparison result to a LOGIC module of the IPM, and the LOGIC module processes each comparison result to obtain rotor information of the motor to be detected.
[0020] The Si Hall magnetic switch is applied to an IPM detection system, and can perfectly replace the existing Insb Hall element in function, and the sensitivity of the Si Hall magnetic switch is moderate, the output port can directly output high and low levels and reference voltages, and the output is more intuitive and stable than that of a linear Hall, and stable output results can be obtained even at high temperature (150 DEG C), and the Si Hall magnetic switch has high reliability. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 is a structure schematic view of the Si Hall magnetic switch according to the embodiment one of the utility model.
[0022] Figure 2 is a packaging schematic view of the Si Hall magnetic switch according to the embodiment one of the utility model.
[0023] Figure 3 is a structure schematic view of the Si Hall magnetic switch according to the embodiment two of the utility model.
[0024] Figures 4(a) to 4(e) is an output processing module type view in the Si Hall magnetic switch according to the embodiment two of the utility model.
[0025] Figure 5 is a principle block diagram of the IPM detection system based on the Si Hall magnetic switch according to the embodiment two of the utility model.
[0026] Figures 6(a) to 6(b) is Figure 5 is an output voltage schematic view of the output port of the Si Hall magnetic switch in figure 6 (a). Figure 5 is an output voltage schematic view of the reference port of the Si Hall magnetic switch in figure 6 (b). DETAILED DESCRIPTION
[0027] The preferred embodiments of the utility model are described in detail below with reference to the drawings.
[0028] Embodiment one
[0029] As Figure 1As shown, this embodiment provides a Si Hall magnetic switch 10, which includes an oscillator 11, a Hall block 12, a Hall signal processing unit 13, a hysteresis comparison unit 14, a reference processing module 15, and an output processing module 16. The oscillator 11 is connected to the Hall block 12, the Hall signal processing unit 13, the hysteresis comparison unit 14, and the reference processing module 15, respectively. The Hall block 12, the Hall signal processing unit 13, and the hysteresis comparison unit 14 are connected in sequence, and the hysteresis comparison unit 14 is connected to the output processing module 16.
[0030] The aforementioned oscillator 11, Hall effect block 12, Hall signal processing unit 13, hysteresis comparator 14, reference processing module 15, and output processing module 16 are all connected to the power supply and grounded. For ease of display, Figure 1 An abbreviated drawing method was used. Additionally, it should be noted that since the overall chip structure is fabricated on a Si wafer, the Hall magnetic switch provided in this embodiment is a Si Hall magnetic switch.
[0031] like Figure 2 As shown, the Si Hall magnetic switch 10 has four ports: a power supply port VDD, a ground port GND, an output port OUT, and a reference port VREF. Specifically, the port used to connect to the power supply forms the power supply port VDD of the Si Hall magnetic switch 10, and the port used for grounding forms the ground port GND of the Si Hall magnetic switch 10. The reference processing module 15 has an output terminal for outputting the voltage it has processed, and this output terminal forms the reference port VREF of the Si Hall magnetic switch 10. The output processing module 16 also has an output terminal, forming the output port OUT of the Si Hall magnetic switch 10. In this embodiment, the internal power supply voltage of the Si Hall magnetic switch 10 is the power supply voltage value.
[0032] The functions of each component in the aforementioned Si Hall magnetic switch 10 are as follows: oscillator 11 provides the chip clock; Hall block 12 senses the Hall signal; Hall signal processing unit 13 processes the Hall signal; hysteresis comparator 14 outputs the magnetic field comparison result based on the output signal of Hall signal processing unit 13; and output processing module 16 processes the magnetic field comparison result to control the output port OUT to output a high level of the internal power supply of the Si Hall magnetic switch 10 or a low level of the ground port GND. Reference processing module 15 provides the output voltage of reference port VREF, which is typically half the high level value output by output port OUT. It should be noted that the reference voltage value output by reference port VREF can also be other fixed reference values.
[0033] Example 2
[0034] If a low-voltage output is required in a practical application, a low-dropout linear regulator can be used to step down the voltage. For example...Figure 3 As shown, in this embodiment, the reference processing module uses a low-dropout linear regulator 15'. At this time, the output processing module 16 is not connected to the power supply, but is connected to the low-dropout linear regulator 15', so that the internal power supply voltage of the Si Hall magnetic switch 10 is the output voltage value of the low-dropout linear regulator 15'.
[0035] In this embodiment, the low-dropout linear regulator 15' is used to provide the output voltages for the OUT port and the VREF port. That is, the low-dropout linear regulator 15' has two outputs, one of which is used to supply the internal power to the output processing module 16 under normal conditions, and the other is used to output the voltage of the reference port VREF. Similarly, the reference voltage value output by the reference port VREF can be half of the high-level value output by the output port OUT, or it can be other fixed reference voltage values.
[0036] This embodiment illustrates one implementation of the output processing module 16, which includes a first MOSFET 161 and a second MOSFET 162. Specifically, the hysteresis comparator unit 14 is connected to the gate of the first MOSFET 161 and the gate of the second MOSFET 162, respectively. The source of the first MOSFET 161 is connected to the low-dropout linear regulator 15', and the drain of the first MOSFET 161 is connected to the drain of the second MOSFET 17, forming the output port OUT of the Si Hall magnetic switch 10. The source of the second MOSFET 17 is grounded.
[0037] It should be noted that the output processing module 16 can be implemented in any way, such as Figures 4(a) to 4(e) As shown, the output can be a built-in pull-up / pull-down resistor output, an external pull-up / pull-down resistor output, or a CMOS push-pull output. It should be understood that the implementation of the output processing module 16 is not limited to the five types shown in Figure 4; only the commonly used types are shown here.
[0038] Apart from the above description, the structure and function of the other devices are the same as in Embodiment 1, and will not be repeated here.
[0039] Example 3
[0040] Compared with the existing three-port Si Hall magnetic switch, the Si Hall magnetic switch provided in Embodiment 1 or Embodiment 2 adds a reference port, which can be adapted to the peripheral logic processing module of IPM.
[0041] like Figure 5 As shown, this embodiment provides an IPM detection system based on Si Hall magnetic switches, including a plurality of Si Hall magnetic switches provided in Embodiment 1 above. The Si Hall magnetic switches are installed on the stator of the motor to be tested, and the output port OUT and the reference port VREF of the Si Hall magnetic switches are both connected to the IPM.
[0042] The number of Si Hall magnetic switches is determined by the type of the motor, and in this embodiment, a three-phase brushless DC motor is taken as an example, the rotor of the three-phase brushless DC motor is a permanent magnet, and three Si Hall magnetic switches are needed to detect the rotor position, and the three Si Hall magnetic switches HW, HU and HV are usually installed on the motor stator at intervals of 60° or 120°.
[0043] As shown in Figures 6(a) to 6(c) , for each Si Hall magnetic switch, the output port OUT of the Si Hall magnetic switch is initially in a high level state, the rotor magnetic pole is close, the Si Hall magnetic switch detects that the magnetic field is greater than the set BOP (Operating Point) threshold value, and the output port OUT outputs a high level; when the rotor magnetic pole is far away, the Si Hall magnetic switch detects that the magnetic field is less than the set BRP (Release Point) threshold value, and the output port OUT outputs a low level, while the reference port VREF always outputs a reference voltage, which is half of the high level value of the output port. After the IPM receives the output level from the output port OUT and the reference voltage from the reference port VREF, the comparator compares the output level and the reference voltage, and transmits the comparison result to the LOGIC module of the IPM, and the LOGIC module processes each comparison result, and can obtain the position, rotation direction and rotation speed of the motor rotor, so as to determine the sequence and rate of energizing the motor stator winding, and then sequentially energize each phase through the output (corresponding to U, V and W in Figure 3 , so that the direction of the magnetic field generated by the stator changes continuously and uniformly, thereby driving the rotor to rotate.
[0044] The utility model proposes using Si Hall switch with reference to replace Insb linear Hall IPM detection scheme in view of the defects of prior art, Si Hall switch has two outputs, OUT port outputs high and low level, VREF port outputs reference voltage, completely adapts to using linear Hall IPM detection system, can reduce cost, and promotes high temperature performance.
[0045] The above is only the preferred embodiment of the utility model, and is not used to limit the range of the utility model, and the above embodiment of the utility model can also be variously changed. That is, all simple, equivalent changes and modifications made according to the content of the claims and the specification of the utility model application fall within the protection scope of the claims of the utility model patent. The utility model is not described in detail, and is conventional technical content.
Claims
1. A Si Hall magnetic switch, characterized in that, The Si Hall magnetic switch has a power port, a ground port, an output port, and a reference port. It includes an oscillator, a Hall block, a Hall signal processing unit, a hysteresis comparison unit, a reference processing module, and an output processing module. The oscillator is connected to the Hall block, the Hall signal processing unit, the hysteresis comparison unit, and the reference processing module, respectively. The Hall block, the Hall signal processing unit, and the hysteresis comparison unit are connected in sequence. The hysteresis comparison unit is connected to the output processing module.
2. The Si Hall magnetic switch according to claim 1, characterized in that, The output terminal of the reference processing module forms the reference port of the Si Hall magnetic switch, and the output terminal of the output processing module forms the output port of the Si Hall magnetic switch.
3. The Si Hall magnetic switch according to claim 1, characterized in that, The oscillator, the Hall block, the Hall signal processing unit, the hysteresis comparison unit, the reference processing module, and the output processing module are all grounded, and the grounding port forms the grounding port of the Si Hall magnetic switch.
4. The Si Hall magnetic switch according to claim 1, characterized in that, The oscillator, the Hall block, the Hall signal processing unit, the hysteresis comparison unit, and the reference processing module are all connected to the power supply, and the port of the power supply is used to form the power port of the Si Hall magnetic switch.
5. The Si Hall magnetic switch according to claim 4, characterized in that, The output processing module is connected to the power supply, and the internal power supply voltage of the Si Hall magnetic switch is the voltage value of the power supply.
6. The Si Hall magnetic switch according to claim 1, characterized in that, The reference processing module uses a low-dropout linear regulator, the output processing module is connected to the low-dropout linear regulator, and the internal power supply voltage of the Si Hall magnetic switch is the output voltage value of the low-dropout linear regulator.
7. An IPM detection system based on a Si Hall magnetic switch, comprising a Si Hall magnetic switch and an IPM as described in any one of claims 1 to 6, wherein the Si Hall magnetic switch is mounted on the stator of the motor to be tested, and both the output port and the reference port of the Si Hall magnetic switch are connected to the IPM.
8. The IPM detection system based on Si Hall magnetic switches according to claim 7, characterized in that, The Si Hall magnetic switch is configured as follows: The reference port maintains the output reference voltage throughout the entire process; When the N pole of the motor rotor is detected to be approaching, the output port outputs a high level; when the N pole of the motor rotor is detected to be moving away, the output port outputs a low level. or, When the N pole of the motor rotor is detected to be approaching, the output port outputs a low level; when the N pole of the motor rotor is detected to be moving away, the output port outputs a high level.
9. The IPM detection system based on Si Hall magnetic switches according to claim 7, characterized in that, The high-level value output by the output port is the internal power supply voltage value of the Si Hall magnetic switch, and the low-level value output by the output port is the ground voltage; the reference voltage value output by the reference port is half of the high-level value output by the output port, or any fixed value.
10. The IPM detection system based on a Si Hall magnetic switch according to claim 7, characterized in that, The IPM is set as follows: After receiving the output level from the output port and the reference voltage from the reference port, the IPM compares the output level and the reference voltage through a comparator and transmits the comparison result to the LOGIC module of the IPM. The LOGIC module processes each comparison result to obtain the rotor information of the motor under test.