Electric pruning shears

Abstract

The invention discloses a pair of electric pruning shears. The electric pruning shears comprise a Hall circuit; the Hall circuit comprises a plurality of first-type three-wire Hall sensors, at least one second-type three-wire Hall sensor and a voltage division circuit; the voltage division circuit comprises a first resistor, a first voltage division branch and a second voltage division branch, and the first resistor is connected in series with the first voltage division branch and the second voltage division branch; the first voltage dividing branch comprises a plurality of first voltage dividing points, and the signal output end of one first-type three-wire Hall sensor is connected with one first voltage dividing point; the second voltage dividing branch comprises at least one second voltage dividing point, and the signal output end of the second-type three-wire Hall sensor is connected with one second voltage dividing point; the first voltage dividing branch is further provided with a voltage sampling point, and the voltage of the voltage sampling point is used for determining the working states of the first-type three-wire Hall sensor and the second-type three-wire Hall sensor.

Description

Technical Field

[0001] The embodiments of the present invention relate to electronic equipment technology, and more particularly to an electric pruning shears. Background Technology

[0002] Currently, most mainstream electric pruning shears include functions such as a trigger button, position detection, and blade size switching. These functions are achieved by using a Hall effect sensor at the blade tip to transmit position information to the control board. The Hall effect sensor mainly consists of Hall sensors, signal transmission lines, power lines, and resistors and capacitors.

[0003] Currently, the two-channel ADC detection method used in the market employs two wires to identify the trigger signal and the blade status Hall signal, respectively. However, the diverse functions of electric pruning shears, such as battery temperature protection, MOS temperature protection, battery voltage detection, and temperature detection, necessitate the use of multiple ADC channels. When the main control chip has a limited number of pins, some functional deficiencies may occur.

[0004] The second method used in the market is to place an 8-bit microcontroller on the Hall effect board and send the trigger signal and position Hall effect signal to the main control board chip in the form of serial port data. However, placing a microcontroller on the Hall effect board increases the cost significantly, and the increased production cost will lead to a lack of market competitiveness. Summary of the Invention

[0005] This invention provides an electric pruning shear to achieve the purpose of detecting the working status of multiple Hall sensors through a single wire.

[0006] This invention provides an electric pruning shear, comprising:

[0007] Hall effect circuit;

[0008] The Hall circuit includes multiple first-type three-wire Hall sensors, at least one second-type three-wire Hall sensor, and a voltage divider circuit.

[0009] The voltage divider circuit includes a first resistor, a first voltage divider branch, and a second voltage divider branch, wherein the first resistor is connected in series with the first voltage divider branch and the second voltage divider branch, respectively.

[0010] The first voltage divider branch includes multiple first voltage divider points, and the signal output terminal of a first type three-wire Hall sensor is connected to one of the first voltage divider points;

[0011] The second voltage divider branch includes at least one second voltage divider point, and the signal output terminal of the second type three-wire Hall sensor is connected to one of the second voltage divider points;

[0012] The first voltage divider branch is also configured with a voltage sampling point, the voltage of which is used to determine the operating status of the first type of three-wire Hall sensor and the second type of three-wire Hall sensor.

[0013] Optionally, the first voltage divider branch includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor connected in series;

[0014] The voltage division point between the second resistor and the third resistor is used as the voltage sampling point;

[0015] The voltage divider points of the third and fourth resistors, the fourth and fifth resistors, and the fifth and sixth resistors are each considered as the first voltage divider point.

[0016] Optionally, the second voltage divider branch includes a seventh resistor and an eighth resistor connected in series;

[0017] The voltage divider point between the seventh and eighth resistors is used as the second voltage divider point.

[0018] Optionally, the operating state includes one of the first type of three-wire Hall sensors being turned off, and the second type of three-wire Hall sensor being turned off;

[0019] All first-type three-wire Hall sensors are turned on, and second-type three-wire Hall sensors are turned off;

[0020] One of the first type of three-wire Hall sensors is turned off, and the second type of three-wire Hall sensor is turned on;

[0021] All first-type three-wire Hall sensors are turned on, and second-type three-wire Hall sensors are turned on.

[0022] Optionally, the first type of three-wire Hall sensor includes a closed position sensor, a narrow position sensor, and an open position sensor;

[0023] The closed-end position sensor is used to detect the setting signal of the closed end of the blade, the narrow-end position sensor is used to detect the setting signal of the narrow end of the blade, and the open-end position sensor is used to detect the setting signal of the open end of the blade.

[0024] Optionally, the second type of three-wire Hall sensor is used for trigger action detection of electric pruning shears.

[0025] Optionally, the first type of three-wire Hall sensor and the second type of three-wire Hall sensor employ unipolar Hall switches.

[0026] Optionally, the signal output terminal of the second type of three-wire Hall sensor is also equipped with a pull-up resistor.

[0027] Optionally, the first type of three-wire Hall sensor uses model AH1921.

[0028] Optionally, the second type of three-wire Hall sensor uses the MT3303 model.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention proposes an electric pruning shear, which includes a voltage divider circuit. The voltage divider circuit includes a first resistor and a first voltage divider branch and a second voltage divider branch connected in parallel. A first type three-wire Hall sensor is configured to be connected to the first voltage divider branch, and a second type three-wire Hall sensor is connected to the second voltage divider branch. When the working state of the second type three-wire Hall sensor changes, the equivalent voltage divider resistance of the voltage divider circuit can be changed to achieve the effect of controlling the equivalent voltage divider resistance. When the working state of the first type three-wire Hall sensor changes, the equivalent voltage divider resistance of the voltage divider circuit changes again, thereby changing the voltage at the voltage sampling point.

[0030] Since the first and second voltage divider branches are connected in parallel to form a parallel system, based on the calculation method of the parallel equivalent resistance and the appropriate selection of resistors in the two voltage divider branches, it is possible to support different operating states for the second type of three-wire Hall sensor and the first type of three-wire Hall sensor. The voltage of the voltage sampling point reflects the combination of different operating states of the two types of Hall sensors. For example, based on the voltage discrimination of the voltage sampling point, it is possible to support the second type of three-wire Hall sensor to have 2 operating states and the first type of three-wire Hall sensor to have 4 combinations of operating states, so that the two types of Hall sensors include a total of 8 combinations of operating states. The voltage sampling point outputs different voltages corresponding to different combinations of operating states. By configuring the controller to use the voltage of the voltage sampling point, it is possible to obtain the 8 combinations of operating states of the Hall sensor through a single line.

[0031] In this solution, the combined operating states of all Hall sensors are obtained through a single line, eliminating the need for an additional microcontroller to separately acquire the operating state of each Hall sensor. This effectively reduces the production cost of Hall plates and enhances the manufacturer's market competitiveness. Attached Figure Description

[0032] Figure 1 This is a block diagram of the Hall circuit structure in the embodiment;

[0033] Figure 2 This is a schematic diagram of the Hall circuit in the embodiment. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0035] Figure 1 This is a block diagram of the Hall circuit structure in the embodiment, for reference. Figure 1 Electric pruning shears include Hall effect circuits;

[0036] The Hall circuit includes multiple Class I three-wire Hall sensors (Class I three-wire Hall sensors 1 to n), at least one Class II three-wire Hall sensor, and a voltage divider circuit;

[0037] The voltage divider circuit includes a first resistor 100, a first voltage divider branch 101, and a second voltage divider branch 102. The first resistor 100 is connected in series with the first voltage divider branch 101 and the second voltage divider branch 102, respectively.

[0038] The first voltage divider branch 101 includes multiple first voltage divider points, and the signal output terminal of a first type three-wire Hall sensor is connected to one of the first voltage divider points;

[0039] The second voltage divider branch 102 includes at least one second voltage divider point, and the signal output terminal of the second type three-wire Hall sensor is connected to one of the second voltage divider points;

[0040] The first voltage divider branch is also configured with a voltage sampling point TC_BAT. The voltage of the voltage sampling point TC_BAT is used to determine the operating status of the first type of three-wire Hall sensor and the second type of three-wire Hall sensor.

[0041] For example, in this solution, the Hall sensor is classified according to its function. For instance, in an electric pruning shears, if the Hall sensor is configured to detect the signal for setting the blade position, it can be classified as a first-class Hall sensor; if the Hall sensor is configured to detect the signal for trigger action, it can be classified as a second-class Hall sensor.

[0042] For example, in this solution, the first type of Hall sensor and the second type of Hall sensor can be the same or different, and the specific model used can be selected according to the requirements.

[0043] In this scheme, the Hall sensor configured in the electric pruning shears is set to be a three-wire Hall sensor. A three-wire Hall sensor usually has three pins, namely positive power, ground power and signal output. The power pin is used to provide the working voltage to the Hall sensor, and the signal output pin outputs the corresponding voltage signal according to the change of magnetic field, thereby reflecting the state or position information of the measured object.

[0044] Among them, the output signal type of the three-wire Hall sensor is relatively simple, usually a digital signal, that is, an output high level or low level. When the detected magnetic field strength exceeds the set threshold, the level state of the output pin will change, for example, from high level to low level or from low level to high level.

[0045] For example, in this solution, the working states of the first type of three-wire Hall sensor and the second type of three-wire Hall sensor are set to include two states: on and off. When in the on state, the Hall sensor is powered on and works; when in the off state, the Hall sensor stops working.

[0046] For example, in this solution, the number of the first type of Hall sensor and the second type of Hall sensor is set according to the functional requirements of the electric pruning shears;

[0047] Accordingly, the number of voltage dividing resistors and the number of first voltage dividing points in the first voltage dividing branch 101 are determined according to the number of first type Hall sensors. The number of first voltage dividing points can be greater than or equal to the number of first type Hall sensors.

[0048] The number of voltage dividing resistors and the number of second voltage dividing points in the second voltage dividing branch 102 are determined according to the number of second type Hall sensors. The number of second voltage dividing points can be greater than or equal to the number of second type Hall sensors.

[0049] For example, in this solution, the operating states of the first type of Hall sensor and the second type of Hall sensor can be set to be independent of each other, and the operating states of the first type of Hall sensor can be set to be independent of each other or related to each other based on preset conditions.

[0050] When multiple second-type Hall sensors are included, the operating states of the second-type Hall sensors can be independent of each other or correlated with each other based on preset conditions.

[0051] In this scheme, the sampling voltage of the voltage sampling point TC_BAT is used to determine the working state (combination) of the first type of three-wire Hall sensor and the second type of three-wire Hall sensor;

[0052] Specifically, based on the parallel voltage divider circuit formed by the first resistor 100, the first voltage divider branch 101, and the second voltage divider branch 102, when the working states (combinations) of the first type of three-wire Hall sensor and the second type of three-wire Hall sensor are different, the potential at the voltage sampling point TC_BAT is different. Based on this, the above working state can be determined by using the sampling voltage at the voltage sampling point TC_BAT.

[0053] For example, in this solution, the controller can be configured to acquire the sampled voltage at the voltage sampling point TC_BAT, determine the above working state based on the sampled voltage, and then execute the preset control logic based on the working state.

[0054] For example, in this solution, the correspondence between the sampled voltage of the voltage sampling point TC_BAT and the working state can be stored in the controller. After the controller is configured to obtain the sampled voltage, it can determine the corresponding working state based on table lookup or other methods.

[0055] This embodiment proposes an electric pruning shear. The electric pruning shear includes a voltage divider circuit, which includes a first resistor and a first voltage divider branch and a second voltage divider branch connected in parallel. A first type three-wire Hall sensor is connected to the first voltage divider branch, and a second type three-wire Hall sensor is connected to the second voltage divider branch. When the working state of the second type three-wire Hall sensor changes, the equivalent voltage divider resistance of the voltage divider circuit can be changed to achieve the effect of controlling the equivalent voltage divider resistance. When the working state of the first type three-wire Hall sensor changes, the equivalent voltage divider resistance of the voltage divider circuit changes again, thereby changing the voltage at the voltage sampling point.

[0056] Since the first and second voltage divider branches are connected in parallel to form a parallel system, based on the calculation method of the parallel equivalent resistance and the appropriate selection of resistors in the two voltage divider branches, it is possible to support different operating states for the second type of three-wire Hall sensor and the first type of three-wire Hall sensor. The voltage of the voltage sampling point reflects the combination of different operating states of the two types of Hall sensors. For example, based on the voltage discrimination of the voltage sampling point, it is possible to support the second type of three-wire Hall sensor to have 2 operating states and the first type of three-wire Hall sensor to have 4 combinations of operating states, so that the two types of Hall sensors include a total of 8 combinations of operating states. The voltage sampling point outputs different voltages corresponding to different combinations of operating states. By configuring the controller to use the voltage of the voltage sampling point, it is possible to obtain the 8 combinations of operating states of the Hall sensor through a single line.

[0057] In this solution, the combined operating states of all Hall sensors are obtained through a single line, eliminating the need for an additional microcontroller to separately acquire the operating state of each Hall sensor. This effectively reduces the production cost of Hall plates and enhances the manufacturer's market competitiveness.

[0058] exist Figure 1 Based on the scheme shown, in one possible implementation, the first voltage divider branch is configured to include a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor connected in series;

[0059] Set the voltage divider point between the second and third resistors as the voltage sampling point (TC_BAT);

[0060] Set the voltage divider points for the third and fourth resistors, the fourth and fifth resistors, and the fifth and sixth resistors as a first voltage divider point.

[0061] For example, in this solution, the electric pruning shears are configured to include three first-type Hall sensors, and correspondingly, the first voltage divider branch includes three first voltage divider points, with the signal output terminal of one first-type Hall sensor being connected to one of the first voltage divider points.

[0062] For example, in this solution, based on the configuration of three Class I Hall sensors on the electric pruning shears, a first voltage divider branch is set up using a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor. This facilitates the selection of resistors. By selecting appropriate resistor values, the voltage distribution of the voltage sampling point TC_BAT can be made reasonable when the working state is different, so as to effectively distinguish different working states.

[0063] Furthermore, in one possible implementation, the first type of three-wire Hall sensor includes a closed position sensor, a narrow-mouth position sensor, and an open position sensor;

[0064] The closed-end position sensor is used to detect the setting signal for the closed end of the blade, the narrow-end position sensor is used to detect the setting signal for the narrow end of the blade, and the open-end position sensor is used to detect the setting signal for the open end of the blade.

[0065] For example, in this solution, the models of the first type of three-wire Hall sensors can be the same, and one first type of three-wire Hall sensor is set to work at the same time, that is, the knife edge position can only present one of the following states at the same time: closed, narrow, or open.

[0066] For example, in this solution, "closed blade" means the blade is completely closed, with the blades tightly fitted together. For instance, when the pruning shears are not being used or the location is not being changed, the closed state can prevent accidental injury from the blades and protect them from damage caused by external impacts.

[0067] A narrow cut refers to a cut that is partially closed but leaves a small gap. When pruning thin, tender branches or when fine-tuning or positioning branches during pruning, a narrow cut allows for more precise control over the position and force of the cut.

[0068] The blade opening refers to the blades being fully open, with the distance between the blades at their maximum. This opening is primarily to facilitate the insertion of thicker branches that need pruning, allowing the branches to smoothly enter the cutting area between the blades and ensuring efficient pruning.

[0069] exist Figure 1 Based on the scheme shown, in one possible implementation, the second voltage divider branch is configured to include a seventh resistor and an eighth resistor connected in series.

[0070] The voltage divider point between the seventh and eighth resistors is used as the second voltage divider point.

[0071] For example, in this solution, the electric pruning shears are configured to include a second type of Hall sensor, and correspondingly, the second voltage divider branch includes a second voltage divider point, and the signal output terminal of the second type of Hall sensor is connected to the second voltage divider point.

[0072] For example, in this solution, based on the configuration of a second type of Hall sensor on the electric pruning shears, a second voltage divider branch is set up using a seventh resistor and an eighth resistor, which can reduce the cost of the electric pruning shears.

[0073] Based on any of the aforementioned schemes, in one possible implementation, setting the operating state (the combination of the first type of Hall sensor and the second type of Hall sensor) includes:

[0074] One type I three-wire Hall sensor is turned off, and the other type II three-wire Hall sensor is turned off.

[0075] All Type I three-wire Hall sensors are turned on, and Type II three-wire Hall sensors are turned off.

[0076] One type I three-wire Hall sensor is off, and one type II three-wire Hall sensor is on.

[0077] All Type I three-wire Hall sensors are turned on, and all Type II three-wire Hall sensors are turned on.

[0078] For example, in this solution, the control logic for turning the Hall sensor on and off can be set according to actual needs;

[0079] For example, it can be set that when the first type of three-wire Hall sensor is off, it corresponds to the electric pruning shears being set to a specified opening position, and when the first type of three-wire Hall sensor is on, it corresponds to the electric pruning shears not being set to an opening position.

[0080] When the second type of three-wire Hall sensor is off, it corresponds to the trigger action of the electric pruning shears; when the second type of three-wire Hall sensor is on, it corresponds to the trigger action of the electric pruning shears not being activated.

[0081] For example, in this solution, the trigger is configured such that when the operator presses the trigger, the internal circuit switch closes, thereby starting the motor to run and driving the blades of the pruning shears to perform a cutting action; when the trigger is released, the circuit switch opens, the motor stops running, and the cutting action stops.

[0082] For example, in this solution, the blade position on the same electric pruning shears can only be one of the following states at any given time: closed, narrow, or open; they cannot coexist simultaneously.

[0083] Based on any of the aforementioned schemes, in one possible implementation, a second type of three-wire Hall sensor is set up for detecting the trigger action of electric pruning shears.

[0084] Based on any of the aforementioned schemes, in one possible implementation scheme, the first type of three-wire Hall sensor and the second type of three-wire Hall sensor are configured to use unipolar Hall switches.

[0085] For example, in this solution, the working principle of the unipolar Hall switch is as follows:

[0086] When the south (or north) pole of a magnetic field approaches a Hall switch, a potential difference is generated inside the Hall element. When the strength of this magnetic field reaches a certain threshold (called the operating point), the output of the Hall switch will flip, for example, from high level to low level or from low level to high level. When the magnetic field disappears or its strength falls below the release point, the output will return to its initial state.

[0087] Based on any of the aforementioned schemes, in one possible implementation, the signal output terminal of the second type three-wire Hall sensor is further equipped with a pull-up resistor.

[0088] In this scheme, a second type of three-wire Hall sensor is set to detect the signal of trigger action. The purpose of setting a pull-up resistor at the signal output terminal of the Hall sensor is to make the voltage division voltage of the second type of three-wire Hall sensor controllable.

[0089] For example, in this solution, when there is a signal output, the output resistance of the Hall sensor changes with the magnetic field. Due to the presence of the pull-up resistor, the output voltage is equal to the power supply voltage multiplied by the ratio of the pull-up resistor to the sum of the pull-up resistor and the Hall sensor output resistance.

[0090] In this way, a relatively stable voltage division relationship is formed between the output voltage and the output resistance of the Hall sensor. Within a certain range, this voltage division relationship can make the voltage of the output signal more linear with the change of the magnetic field, so that the voltage division can remain relatively stable and controllable under different magnetic field strengths.

[0091] Based on any of the aforementioned schemes, in one possible implementation scheme, the model of the first type of three-wire Hall sensor is set to AH1921.

[0092] Based on any of the aforementioned schemes, in one possible implementation scheme, the second type of three-wire Hall sensor is designated as model MT3303.

[0093] Figure 2 This is a schematic diagram of the Hall circuit in the embodiment, for reference. Figure 2 Based on any of the aforementioned schemes, in one possible implementation, the Hall circuit includes:

[0094] First resistor R1, second resistor R8, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R10;

[0095] The second resistor R8, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are connected in series to form the first voltage divider branch, and the seventh resistor R7 and the eighth resistor R10 are connected in series to form the second voltage divider branch.

[0096] The first resistor R1 is connected in series with the first voltage divider branch and the second voltage divider branch to form a voltage divider circuit;

[0097] It also includes the first type of three-wire Hall sensor U2, the first type of three-wire Hall sensor U3, the first type of three-wire Hall sensor U4, and the second type of three-wire Hall sensor U1;

[0098] The signal output terminal of the first type three-wire Hall sensor U2 is connected to the first voltage divider point b; the signal output terminal of the first type three-wire Hall sensor U3 is connected to the first voltage divider point c; and the signal output terminal of the first type three-wire Hall sensor U4 is connected to the first voltage divider point d.

[0099] The signal output terminal of the second type three-wire Hall sensor U1 is connected to the second voltage divider point e;

[0100] The first voltage divider branch is also configured with a voltage sampling point TC_BAT. The voltage of the voltage sampling point TC_BAT is used to determine the operating status of the first type of three-wire Hall sensor and the second type of three-wire Hall sensor.

[0101] In this scheme, U2, U3, U4, and U1 are respectively used to detect the setting signal for the closed blade, the setting signal for the narrow blade, the setting signal for the open blade, and the trigger action detection of the electric pruning shears.

[0102] In this scheme, U2, U3, and U4 are designated as model AH1921, while U1 is designated as model MT3303.

[0103] In this scheme, the working states (combinations) of U2, U3, U4, and U1 are set to include 8 types, specifically:

[0104] U1 is off, U2 is off; U1 is off, U3 is off; U1 is off, U4 is off; U1 is off, U2~U4 are on;

[0105] U1 on, U2 off; U1 on, U3 off; U1 on, U4 off; U1 on, U2-U4 on.

[0106] In this scheme, the Hall circuit belongs to the parallel system circuit. When the trigger is not pressed, the voltage at point a depends on the seventh resistor R7 and the eighth resistor R10, as well as the parallel U2, U3, and U4 (operating state).

[0107] When trigger U1 is pressed, the voltage at point a depends on the seventh resistor R7 and the parallel resistors U2, U3, and U4 (operating state);

[0108] based on Figure 2 The Hall circuit design shown allows the voltage sampling point TC_BAT to output 8 levels, which the controller connected to TC_BAT can use to distinguish the trigger state and the position of the blade.

[0109] Specifically, based on circuit analysis, the following conclusions can be drawn from this solution:

[0110] The voltage at point a is obtained by dividing the voltage across the second resistor R8, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R10, and the first resistor R1.

[0111] The voltage at point b is equal to the voltage at point a, which is either R4, (R4+R5), (R4+R5+R6) and (R8+R3), or 0.

[0112] The voltage at point c is R5, (R5+R6) and (R4+R3+R8) divided by the voltage at point a or 0;

[0113] The voltage at point d is either the voltage at point a divided by R6 and (R5+R4+R3+R8) or 0;

[0114] The voltage at point e is either floating or 0. The floating voltage is the voltage at point a shared by R10 and R7.

[0115] The voltage of TC_BAT is the voltage at point a of R3, (R3+R4), (R3+R4+R5), (R3+R4+R5+R6) and R8.

[0116] In this scheme, under different operating conditions of the first type of three-wire Hall sensor and the second type of three-wire Hall sensor, the equivalent value of the parallel resistance can be determined by the following formula:

[0117] U1 off, U2 off:

[0118]

[0119] U1 off, U3 off:

[0120]

[0121] U1 off, U4 off:

[0122]

[0123] U1 is off, U2-U4 are on:

[0124]

[0125] U1 on, U2 off:

[0126]

[0127] U1 on, U3 off:

[0128]

[0129] U1 on, U4 off:

[0130]

[0131] U1 is enabled, U2~U4 are enabled:

[0132]

[0133] Combining the above equations, we can obtain the voltage of TC_BAT corresponding to the shutdown of U1 and U2:

[0134]

[0135] The voltage of TC_BAT corresponding to U1 being off and U3 being off is:

[0136]

[0137] U1 is off, U4 is off;

[0138]

[0139] U1 is off, U2 to U4 are on;

[0140]

[0141] U1 is on, U2 is off;

[0142]

[0143] U1 is on, U3 is off;

[0144]

[0145] U1 is on, U4 is off;

[0146]

[0147] The voltages of TC_BAT corresponding to the activation of U1 and U2 to U4 are as follows:

[0148]

[0149] In this solution, the controller can be configured to pre-store the values ​​of TC_BAT_1 to TC_BAT_8 and the corresponding combinations of Hall sensor operating states. When the electric pruning shears are actually working, the corresponding operation can be determined by looking up the table.

[0150] In this scheme, the second type of three-wire Hall sensor U1 uses a Hall sensor that requires an external pull-up signal, so that the voltage divider voltage of the first type of three-wire Hall sensors U2 to U4 can be controlled.

[0151] In this scheme, to ensure the accuracy of voltage sampling point TC_BAT, a window of at least 100 LSB (Least Significant Bit) needs to be opened.

[0152] In this scheme, the LSB window represents the range of input or output signals associated with the least significant bit. For an ADC, it refers to a small range of analog input signals within which the least significant bit of the digital output will change.

[0153] For example, for a 10-bit ADC with a reference voltage of 5V, the voltage corresponding to 1 LSB is approximately 4.88mV (5V / 1024), so the LSB window is approximately 4.88mV.

[0154] The LSB window determines the resolution and accuracy of the ADC or DAC conversion. A smaller LSB window means higher resolution, enabling a more accurate representation of changes in the analog signal.

[0155] In this scheme, by selecting appropriate models for R1, R7, and R10, the detection window will be more obvious and the voltage distribution of different working state combinations will be more reasonable.

[0156] In the electric pruning shears proposed in this solution, a single wire can be configured at the voltage sampling point to connect to the controller. The controller can obtain a combination of all 8 working states of the Hall sensors through the single wire. The circuit architecture is simple, reducing the number of IO ports required in the Hall circuit, thereby reducing production costs and improving product competitiveness.

[0157] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An electric pruning shear, characterized in that, include: Hall effect circuit; The Hall circuit includes multiple first-type three-wire Hall sensors, at least one second-type three-wire Hall sensor, and a voltage divider circuit. The voltage divider circuit includes a first resistor, a first voltage divider branch, and a second voltage divider branch, wherein the first resistor is connected in series with the first voltage divider branch and the second voltage divider branch, respectively. The first voltage divider branch includes multiple first voltage divider points, and the signal output terminal of a first type three-wire Hall sensor is connected to one of the first voltage divider points; The second voltage divider branch includes at least one second voltage divider point, and the signal output terminal of the second type three-wire Hall sensor is connected to one of the second voltage divider points; The first voltage divider branch is also configured with a voltage sampling point, the voltage of which is used to determine the operating status of the first type of three-wire Hall sensor and the second type of three-wire Hall sensor.

2. The electric pruning shears as described in claim 1, characterized in that, The first voltage divider branch includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor connected in series; The voltage division point between the second resistor and the third resistor is used as the voltage sampling point; The voltage divider points of the third and fourth resistors, the fourth and fifth resistors, and the fifth and sixth resistors are each considered as the first voltage divider point.

3. The electric pruning shears as described in claim 1, characterized in that, The second voltage divider branch includes a seventh resistor and an eighth resistor connected in series; The voltage divider point between the seventh and eighth resistors is used as the second voltage divider point.

4. The electric pruning shears as described in claim 2, characterized in that, The operating state includes one of the first type of three-wire Hall sensors being turned off, and the second type of three-wire Hall sensor being turned off. All first-type three-wire Hall sensors are turned on, and second-type three-wire Hall sensors are turned off; One of the first type of three-wire Hall sensors is turned off, and the second type of three-wire Hall sensor is turned on; All first-type three-wire Hall sensors are turned on, and second-type three-wire Hall sensors are turned on.

5. The electric pruning shears as described in claim 2, characterized in that, The first type of three-wire Hall sensor includes a closed-mouth position sensor, a narrow-mouth position sensor, and an open-mouth position sensor; The closed-end position sensor is used to detect the setting signal of the closed end of the blade, the narrow-end position sensor is used to detect the setting signal of the narrow end of the blade, and the open-end position sensor is used to detect the setting signal of the open end of the blade.

6. The electric pruning shears as described in claim 1, characterized in that, The second type of three-wire Hall sensor is used for trigger action detection of electric pruning shears.

7. The electric pruning shears as described in claim 1, characterized in that, Both the first type of three-wire Hall sensor and the second type of three-wire Hall sensor employ unipolar Hall switches.

8. The electric pruning shears as described in claim 1, characterized in that, The signal output terminal of the second type of three-wire Hall sensor is also equipped with a pull-up resistor.

9. The electric pruning shears as described in claim 1, characterized in that, The first type of three-wire Hall sensor uses model AH1921.

10. The electric pruning shears as described in claim 8, characterized in that, The second type of three-wire Hall sensor uses the MT3303 model.

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