Hall sampling device and energy storage inverter comprising same
By introducing voltage improvement modules and modulation modules into the Hall sampling device, the problem of inaccurate parameters caused by unstable supply voltage is solved, the detection accuracy is improved and the cost and volume are reduced.
Patent Information
- Application Number
- CN202420524413.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-18
AI Technical Summary
The parameters measured by the Hall sampling device in the case of unstable or abnormal supply voltage are inaccurate, which affects the detection accuracy.
A Hall sampling device including a voltage improvement module, a Hall detection module and a modulation module is designed. The voltage improvement module filters out interference signals in the auxiliary power supply voltage and provides them to the Hall detection module to improve the stability of the power supply voltage. And use the amplification and follow unit to improve the stability and accuracy of the sampling signal.
It effectively reduces the impact of abnormal power supply voltage on Hall sampling device detection, improves the accuracy of parameters, and reduces cost and circuit volume.
Smart Images
Figure CN222189377U_ABST
Abstract
Description
Technical Field
[0001] The disclosed embodiments of the present application relate to the field of power electronics technology, and more specifically, to a Hall sampling device and an energy storage inverter including the same. Background Art
[0002] The energy storage inverter is the core component of the energy storage system. Its main function is to give priority to supplying the electricity generated by photovoltaic panels to user loads, while storing excess electricity in batteries or converting it into AC power to be sent to the power grid.
[0003] The Hall sampling device can be used to detect the current or voltage parameters in the inverter circuit. The Hall sampling device is a magnetic field sensor made based on the Hall effect. The Hall effect is a type of magnetoelectric effect. The Hall voltage changes with the change of magnetic field strength. The stronger the magnetic field, the higher the voltage, and the weaker the magnetic field, the lower the voltage. The Hall sampling device needs power supply when working. If the power supply voltage is unstable or abnormal, the parameters measured by the Hall sampling device may be inaccurate.
[0004] Therefore, the problem of inaccurate parameters measured by the Hall sampling device when the power supply voltage is unstable or abnormal needs to be solved urgently. Utility Model Content
[0005] According to an embodiment of the present application, the present application proposes a Hall sampling device and an energy storage inverter including the same to solve the problem of inaccurate parameters measured by the Hall sampling device when the power supply voltage is unstable or abnormal.
[0006] According to one aspect of the present application, an exemplary Hall sampling device is disclosed, including a voltage improvement module, a Hall detection module and a modulation module; the power input terminal of the Hall detection module is connected to an auxiliary power supply through the voltage improvement module to obtain an auxiliary power supply voltage, and the voltage improvement module is configured to filter out interference signals in the auxiliary power supply voltage; the sampling signal output terminal of the Hall detection module is configured to generate a sampling signal; the input terminal of the modulation module is connected to the sampling signal output terminal of the Hall detection module, and the modulation module is configured to obtain sampling data from the sampling signal.
[0007] In the above scheme, the auxiliary power supply voltage is transmitted to the Hall detection module after the interference signal is filtered out by the voltage improvement module, thereby reducing the impact of abnormal fluctuations in the power supply voltage on the detection of the Hall sampling device, thereby alleviating the problem of inaccurate parameters measured by the Hall sampling device when the power supply voltage is unstable or abnormal.
[0008] Wherein, the voltage improvement module includes a filter circuit, and the power input end of the Hall detection module is grounded through the filter circuit.
[0009] The above solution can filter out the disturbance of the auxiliary power supply voltage through the filter circuit, thereby improving the accuracy of the detection parameters of the Hall sampling device and reducing the cost.
[0010] The voltage improvement module may further include a voltage divider circuit, and the power input terminal of the Hall detection module is connected to the auxiliary power supply through the voltage divider circuit to obtain the auxiliary power supply voltage.
[0011] The above solution is beneficial to further improve the voltage stability provided to the Hall detection module through the voltage divider circuit.
[0012] The filter circuit at least includes a filter capacitor, and the voltage divider circuit at least includes a voltage divider resistor.
[0013] The above solution is helpful to reduce circuit cost.
[0014] The voltage improvement module includes a DC isolation transformer or a DC power converter.
[0015] The above scheme filters out interference signals in the auxiliary power supply voltage through a DC isolation transformer or a DC power converter, which can improve the accuracy of detection parameters of the Hall sampling device while increasing the integration of the circuit and thus reducing the size of the Hall sampling device.
[0016] Wherein, the modulation module further includes: an amplifying unit and a following unit; the amplifying unit is configured to amplify the sampling signal; and the following unit is configured to obtain the sampling data from the amplified sampling signal.
[0017] In the above solution, the follower unit is used to improve the stability of the output signal of the Hall sampling device, thereby improving the detection accuracy of the Hall sampling device.
[0018] Among them, the Hall detection module also includes a reference signal output terminal; the amplification unit includes an operational amplifier, the sampling signal input terminal of the operational amplifier is connected to the sampling signal output terminal, and the reference signal input terminal of the operational amplifier is connected to the reference signal output terminal; the output terminal of the operational amplifier is connected to the input terminal of the follower unit.
[0019] The amplifying unit further comprises an amplifying filter circuit, one end of which is connected to the first DC power supply, and the other end of which is connected to the reference signal input end and the reference signal output end.
[0020] The above solution can further improve the accuracy of the Hall sampling device by amplifying the filtering circuit.
[0021] Wherein, the modulation module further includes a follower filter circuit connected between the output end of the amplification unit and the input end of the follower unit.
[0022] The above solution can further improve the accuracy of the Hall sampling device by following the filter circuit.
[0023] According to a second aspect of the present application, an energy storage inverter is disclosed, comprising an inverter device and the Hall sampling device in the above-mentioned first aspect.
[0024] In the above scheme, the auxiliary power supply voltage is transmitted to the Hall detection module after the interference signal is filtered out by the voltage improvement module, thereby reducing the impact of abnormal fluctuations in the power supply voltage on the detection of the Hall sampling device, thereby alleviating the problem of inaccurate parameters measured by the Hall sampling device when the power supply voltage is unstable or abnormal. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The present application will be further described below in conjunction with the accompanying drawings and implementation methods, in which:
[0026] Figure 1 It is a schematic diagram of the framework of an embodiment of the Hall sampling device of the present application;
[0027] Figure 2 It is a structural schematic diagram of an embodiment of the Hall sampling device of the present application;
[0028] Figure 3 is a circuit structure diagram of another embodiment of the Hall sampling device of the present application;
[0029] Figure 4 It is a circuit structure schematic diagram of a sampling circuit provided by the present application;
[0030] Figure 5 It is a schematic diagram of the framework structure of an embodiment of the energy storage inverter of the present application. DETAILED DESCRIPTION
[0031] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0032] Please refer to Figure 1 , Figure 1It is a schematic diagram of the framework of an embodiment of the Hall sampling device of the present application; specifically, the Hall sampling device 001 includes a voltage improvement module 230, a Hall detection module 210 and a modulation module 220; the power input end of the Hall detection module 210 is connected to the auxiliary power supply 100 through the voltage improvement module 230 to obtain the auxiliary power supply 100 voltage, and the voltage improvement module 230 is configured to filter out interference signals in the auxiliary power supply 100 voltage; the sampling signal output end of the Hall detection module 210 is configured to generate a sampling signal; the input end of the modulation module 220 is connected to the sampling signal output end O1 of the Hall detection module 210, and the modulation module 220 is configured to: obtain sampling data from the sampling signal.
[0033] In the above scheme, the voltage of the auxiliary power supply 100 is transmitted to the Hall detection module 210 after the interference signal is filtered out by the voltage improvement module, thereby reducing the impact of abnormal fluctuations in the power supply voltage on the detection of the Hall sampling device, thereby alleviating the problem of inaccurate parameters measured by the Hall sampling device when the power supply voltage is unstable or abnormal.
[0034] In some embodiments, the voltage of the auxiliary power supply 100 can be 5V to meet safety requirements; in other embodiments, the voltage of the auxiliary power supply 100 can adopt other voltage values, for example, it can be 15V, 25V, etc. The specific voltage value can be set according to the actual application scenario, and this application is not limited.
[0035] It should be noted that the sampling signal obtained using the Hall detection module 210 may include a voltage sampling signal and / or a current sampling signal, that is, the sampling signal output end of the Hall detection module 210 may only output a current sampling signal, or only output a voltage sampling signal, or may output a voltage sampling signal and a current sampling signal, and this application does not limit this.
[0036] In some embodiments, the voltage improvement module 230 may include a filter circuit (not shown), and the power input terminal of the Hall detection module may be grounded through the filter circuit.
[0037] In some embodiments, the filter circuit may include a filter capacitor, see Figure 2 , Figure 2 It is a structural schematic diagram of an embodiment of the Hall sampling device of the present application; the filtering circuit may include a capacitor C1 and a capacitor C2; the high-frequency disturbance in the auxiliary power supply voltage can be filtered out by the capacitor C1 and the capacitor C2; the filtering circuit may also include a resistor R1, wherein the resistor R1 cooperates with the capacitor C1 and the capacitor C2 to further improve the filtering effect; the resistor R1 may also be used for voltage division with the Hall detection module, thereby facilitating further improving the voltage stability.
[0038] Therefore, by filtering out the disturbance of the auxiliary power supply voltage through the filter circuit, the cost can be reduced while improving the accuracy of the detection parameters of the Hall sampling device.
[0039] In some embodiments, the voltage improvement module may further include a voltage divider circuit (not shown), and the power input terminal of the Hall detection module is connected to the auxiliary power supply through the voltage divider circuit to obtain the auxiliary power supply voltage.
[0040] In some specific implementation scenarios, the voltage divider circuit may include a voltage divider resistor (not shown); the voltage divider resistor may be connected between the auxiliary power supply and the Hall detection module to divide the voltage with the Hall detection module. Figure 2 The voltage divider circuit and the filter circuit can share a resistor R1, that is, the resistor R1 can not only play the role of a voltage divider resistor, but also play the role of a filter resistor.
[0041] like Figure 2 As shown, the voltage improvement module 230 may include a resistor R1 and a filter capacitor; the power input terminal (not shown) is connected to the auxiliary power supply 100 through the resistor R1 to obtain the auxiliary power supply 100 voltage; the power input terminal is grounded through the filter capacitor. Specifically, the filter capacitor may include a capacitor C1 and a capacitor C2, and the capacitor C1 and the capacitor C2 are connected to the ground in parallel. After the auxiliary power supply 100 voltage passes through the filter resistor R1 and the filter capacitor, at least part of the disturbance of the auxiliary power supply 100 voltage can be filtered out; at the same time, the resistor R1 can also play a voltage dividing role. Therefore, the present application is connected between the Hall detection module 210 and the auxiliary power supply 100 through the voltage improvement module 230, so as to reduce the disturbance of the voltage provided by the auxiliary power supply 100 to the Hall detection module 210, thereby protecting the Hall detection module 210 from the abnormal fluctuation of the auxiliary power supply 100 voltage, thereby improving the accuracy of sampling.
[0042] It should be noted that Figure 2 As an example, the voltage improvement module may include a voltage divider circuit and a filter circuit. The specific connection mode, selection and number of components of the resistors and capacitors in the voltage divider circuit and the filter circuit can be designed according to actual needs and are not limited to Figure 2 The embodiment shown.
[0043] In some embodiments, the voltage improvement module may include a DC isolation transformer or a DC power converter (DC-DC converter). The DC isolation transformer and the DC power converter can generate a new DC voltage based on the voltage of the auxiliary power supply 100 to provide to the Hall detection unit, wherein the voltage generated by the DC isolation transformer and the DC power converter has good quality, thereby preventing the Hall detection module 210 from being affected by the voltage fluctuation of the auxiliary power supply 100, thereby improving the sampling accuracy. The DC power converter can specifically be a DC-DC power chip. In this embodiment, by adopting a voltage improvement module including a DC isolation transformer or a DC power converter, compared with the aforementioned embodiment, the circuit integration can be improved, thereby reducing the volume of the Hall sampling device.
[0044] In some embodiments, please refer to Figure 3 , Figure 3 is a schematic diagram of the circuit structure of another embodiment of the Hall sampling device of the present application; specifically, Figure 3 As shown, the modulation module 220 may include an amplifying unit 221 and a following unit 222; the amplifying unit 221 is configured to amplify the sampling signal; the following unit 222 is configured to obtain sampling data from the amplified sampling signal. The amplifying unit is connected to the Hall detection module through resistors R2-R4, and the sampling signal of the Hall detection module 210 is input to the amplifying unit 221 through resistors R2-R4. The amplifying unit 221 includes an operational amplifier U1, wherein the resistor R4, the capacitor C3 and the resistor R6 are used to filter the sampling signal output by the Hall detection module and provide it to the input end of the operational amplifier U1. After the sampling signal is amplified by the amplifying unit 221, it is filtered by the resistor R7 and the capacitor C4 and provided to the operational amplifier U2. The gain multiple of the operational amplifier U2 is 1, and it plays a voltage following role in the circuit. The output voltage of the operational amplifier U2 is filtered by the resistor R8, and a feedback voltage is generated on the capacitor C5. One end of the capacitor C5 is connected to the central processing unit (CPU) to feed back the feedback voltage to the CPU, so that the CPU obtains the feedback voltage and obtains sampling parameters such as voltage and current according to the feedback voltage.
[0045] In some embodiments, please refer to Figure 3 The Hall detection module 210 also includes a reference signal output terminal O2; the operational amplifier includes a sampling signal input terminal I1 and a reference signal input terminal I2, the sampling signal input terminal I1 of the operational amplifier is connected to the sampling signal output terminal O1, and the reference signal input terminal I2 of the operational amplifier is connected to the reference signal output terminal O2; the output terminal of the operational amplifier is connected to the input terminal of the follower unit.
[0046] In some embodiments, please refer to Figure 3The amplifying unit also includes an amplifying filter circuit (not shown). Exemplarily, the amplifying filter circuit may include a resistor R4, a capacitor C3 and a resistor R6. One end of the amplifying filter circuit can be connected to the first DC power supply U3, and the other end is connected to the reference signal input terminal I2 and the reference signal output terminal O2.
[0047] In some embodiments, the modulation module 220 may further include a follower filter circuit (not shown) connected between the output end of the amplification unit and the input end of the follower unit. Exemplarily, the follower filter circuit may include a resistor R7 and a capacitor C4.
[0048] In some embodiments, the modulation module 220 may further include an output filter circuit (not shown), which may be connected to the output end of the follower unit. Exemplarily, the output filter circuit may include a resistor R8.
[0049] In some embodiments, the Hall sampling device in the above embodiments can be applied to a sampling circuit. Figure 4 , Figure 4 is a circuit structure diagram of a sampling circuit provided by the present application; Figure 4 As shown, the sampling circuit can be used to sample three-phase electricity, relays S01~S03 are respectively connected to the three phases A, B, and C, and the Hall sampling device 001 is connected to at least two phases of the three-phase circuit to sample the circuit parameters of two phases; specifically, it can be used for current sampling or voltage sampling; the common mode inductor L1 can filter out voltage interference; capacitors C41 and C42 can perform current sampling.
[0050] According to the second aspect of the present application, an energy storage inverter is provided. Figure 5 , Figure 5 is a schematic diagram of the framework structure of an embodiment of the energy storage inverter of the present application; specifically, as Figure 5 As shown, the energy storage inverter 500 includes an inverter device 510 and the above-mentioned Hall sampling device 001 .
[0051] In the above scheme, the auxiliary power supply voltage is transmitted to the Hall detection module after the interference signal is filtered out by the voltage improvement module, thereby reducing the impact of abnormal fluctuations in the power supply voltage on the detection of the Hall sampling device, thereby alleviating the problem of inaccurate parameters measured by the Hall sampling device when the power supply voltage is unstable or abnormal.
[0052] It is easy for a person skilled in the art to know that many modifications and changes can be made to the device and method while maintaining the teaching content of the present application. Therefore, the above disclosure should be considered as limited only by the scope of the appended claims.
Claims
1. A Hall sampling device, characterized in that: include: Voltage improvement module; A Hall detection module, whose power input terminal is connected to the auxiliary power supply through the voltage improvement module to obtain the auxiliary power supply voltage, and the voltage improvement module is configured to filter out interference signals in the auxiliary power supply voltage; the sampling signal output terminal of the Hall detection module is configured to generate a sampling signal; A modulation module, whose input end is connected to the sampling signal output end of the Hall detection module, and the modulation module is configured to obtain sampling data from the sampling signal.
2. The device according to claim 1, characterized in that The voltage improvement module comprises: A filter circuit, the power input end of the Hall detection module is grounded through the filter circuit.
3. The device according to claim 2, characterized in that The voltage improvement module also includes: A voltage divider circuit, wherein the power input terminal of the Hall detection module is connected to the auxiliary power supply through the voltage divider circuit to obtain the auxiliary power supply voltage.
4. The device according to claim 3, characterized in that The filter circuit at least includes a filter capacitor; The voltage dividing circuit at least includes a voltage dividing resistor.
5. The device according to any one of claims 1 to 3, characterized in that: The voltage improvement module includes a DC isolation transformer or a DC power converter.
6. The device according to claim 1, characterized in that The modulation module also includes: an amplifying unit, configured to amplify the sampling signal; The follower unit is configured to obtain the sampling data from the amplified sampling signal.
7. The device according to claim 6, characterized in that The Hall detection module also includes a reference signal output terminal; The amplification unit comprises: An operational amplifier, wherein the sampling signal input terminal of the operational amplifier is connected to the sampling signal output terminal, the reference signal input terminal of the operational amplifier is connected to the reference signal output terminal; and the output terminal of the operational amplifier is connected to the input terminal of the follower unit.
8. The device according to claim 7, characterized in that The amplification unit further comprises: The amplifying and filtering circuit has one end connected to the first DC power supply and the other end connected to the reference signal input end and the reference signal output end.
9. The device according to claim 6, characterized in that The modulation module also includes: The follower filter circuit is connected between the output end of the amplifying unit and the input end of the follower unit.
10. An energy storage inverter, comprising an inverter device, characterized in that: The energy storage inverter further comprises a Hall sampling device as claimed in any one of claims 1 to 9.