Lock attachment in-place test tool and lock attachment control device

Abstract

The utility model provides a locking in-place test tool and a locking control device, and relates to the technical field of power electronics, the device comprises a detection unit and a control unit, the detection unit is connected with the control unit, and the detection unit is used for detecting the voltage of a battery based on the divided voltage and the sampling current before and after the battery is charged under the condition that the detection unit is connected with an OT terminal. Determining a switch control signal; the OT terminal is locked and attached to an aluminum plate of the battery through a fastener; the switch control signal is used for representing whether the fastener locks the OT terminal and the aluminum plate in place or not; the control unit is connected with the electric screwdriver and the mains supply and used for controlling the on-off state between the electric screwdriver and the mains supply based on the switch control signal so as to control the working state of the electric screwdriver. According to the utility model, the locking in-place detection precision and detection efficiency can be improved, so that the reject ratio of products is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a locking position testing fixture and a locking control device. Background Technology

[0002] Electric screwdrivers are commonly used tools for installing and removing screws in the production process. During production, worker negligence or fatigue may result in screws not being tightened properly or stripping. In single-cell solar products, the OT terminal (Output Terminal, round cold-pressed terminal) is fastened to the aluminum plate with screws. In actual use, it was found that the aluminum plate overheated significantly. Investigation revealed that the screws were not fully tightened, and the OT terminal and aluminum plate had poor contact, resulting in high impedance at the connection point. This caused severe overheating when carrying high current, leading to power loss and threatening the safety of the battery.

[0003] Currently, screw fastening is generally achieved by visually inspecting whether the screw is properly tightened, by setting the torque of the electric screwdriver based on manual experience, or by controlling the electric screwdriver to stop turning when the screw tip contacts the conductive layer of the clamp. However, visual inspection and manual torque setting require a high level of skill from the workers, and the screw fastening error is relatively large in the above three methods, resulting in low screw fastening accuracy and consequently a high product defect rate. Utility Model Content

[0004] This invention provides a screw fastening positioning test fixture and a screw fastening control device to solve the problem of low screw fastening accuracy in the prior art, which leads to a high product defect rate.

[0005] This utility model provides a locking and fastening positioning test fixture, comprising: a detection unit and a control unit, wherein:

[0006] The detection unit is connected to the control unit; the detection unit is used to determine the switch control signal based on the voltage divider and the sampled current before and after battery charging when the OT terminal is connected; the OT terminal is fastened to the aluminum plate of the battery by fasteners; the switch control signal is used to indicate whether the fasteners have secured the OT terminal and the aluminum plate in place;

[0007] The control unit is used to control the on / off state between the electric screwdriver and the mains power supply based on the switch control signal when the electric screwdriver is connected to the mains power supply, so as to control the working state of the electric screwdriver.

[0008] According to the locking and fastening positioning test fixture provided by this utility model, the detection unit includes a detection circuit and a microcontroller, wherein:

[0009] The microcontroller is connected to the detection circuit and the control unit. The detection circuit is also connected to the power adapter, the OT terminal, and the battery.

[0010] The microcontroller is used to generate a charging control signal; the level of the charging control signal is used to control whether the mains power supply charges the battery through the power adapter.

[0011] The detection circuit is used to acquire the voltage divider and sampling current of the battery before and after charging based on the charging control signal;

[0012] The microcontroller is used to determine the battery voltage before and after charging based on the voltage divider voltage before and after charging; to determine the charging current before and after charging based on the sampled current before and after charging; to determine the impedance between the OT terminal and the aluminum plate based on the battery voltage and charging current before and after charging; and to determine the switch control signal based on the impedance.

[0013] According to the locking and engaging testing fixture provided by this utility model, the control unit includes a first switching circuit and a second switching circuit, wherein:

[0014] The first terminal of the first switching circuit is connected to the second output terminal of the microcontroller and is used to receive the switching control signal sent by the microcontroller; the second terminal of the first switching circuit is connected to the power supply terminal, and the third terminal of the first switching circuit is connected to the first terminal of the second switching circuit; the switching control signal is used to control the on / off state of the first switching circuit.

[0015] The second terminal of the second switching circuit is connected to the mains power supply, and the third terminal of the second switching circuit is connected to the electric screwdriver; the on / off state of the first switching circuit is used to control the on / off state between the mains power supply and the electric screwdriver.

[0016] According to the locking and engaging testing fixture provided by this utility model, the first switching circuit includes a first resistor, a second resistor, and a first MOSFET, wherein:

[0017] The first end of the first resistor serves as the first end of the first switching circuit; the second end of the first resistor is connected to the first end of the second resistor and the gate of the first MOS transistor; the second end of the second resistor is connected to the source of the first MOS transistor and serves as the second end of the first switching circuit; the drain of the first MOS transistor serves as the third end of the first switching circuit.

[0018] According to the locking and engaging testing fixture provided by this utility model, the second switching circuit includes a fourth resistor, a diode, a first capacitor, a relay, a first connector, and a second connector, wherein:

[0019] The first end of the fourth resistor is connected to the positive terminal of the diode and the primary negative terminal of the relay, and serves as the first terminal of the second switching circuit; the second end of the fourth resistor is grounded; the negative terminal of the diode is connected to the power supply terminal, the primary positive terminal of the relay, and the first terminal of the first capacitor, and the second terminal of the first capacitor is grounded; the secondary switch in the relay is located on the live wire between the first connector and the second connector, and the on / off state of the secondary switch is used to control the on / off state of the live wire between the first connector and the second connector, so as to control whether the mains power supply provides power output to the electric screwdriver;

[0020] The first connector is connected to the mains power supply and is connected to the second connector via a neutral wire and a ground wire. The second connector is also connected to the electric screwdriver.

[0021] According to the locking and engaging testing fixture provided by this utility model, the detection circuit includes: a current acquisition circuit, a voltage divider acquisition circuit, and a power output control circuit, wherein:

[0022] The first terminal of the power output control circuit is connected to the first output terminal of the microcontroller and is used to receive the charging control signal sent by the microcontroller; the second terminal of the power output control circuit is connected to the battery; the third terminal of the power output control circuit is connected to the power adapter; the fourth terminal of the power output terminal is connected to the first terminal of the current acquisition circuit; the fifth terminal of the power output control circuit is connected to the power supply terminal; the charging control signal is used to control the on / off state of the power output control circuit.

[0023] The second terminal of the current acquisition circuit is connected to the power adapter, and the third terminal of the current acquisition circuit is connected to the first input terminal of the microcontroller; the current acquisition circuit is used to acquire the sampled current of the battery before and after charging based on the on / off state of the power output control circuit.

[0024] The first end of the voltage divider acquisition circuit is connected to the OT terminal, and the second end of the voltage divider acquisition circuit is connected to the second input terminal of the microcontroller; the voltage divider acquisition circuit is used to acquire the voltage divider voltage before and after the battery is charged.

[0025] According to the locking and engaging testing fixture provided by this utility model, the power output control circuit includes a second transistor, a third transistor, a second MOSFET, a third resistor, a fifth resistor, a seventh resistor, an eighth resistor, and a fifth connector, wherein:

[0026] The first end of the eighth resistor is connected to the base of the third transistor and serves as the first end of the power output control circuit. The second end of the eighth resistor is connected to the emitter of the third transistor and the second end of the seventh resistor, and both are grounded.

[0027] The collector of the third transistor is connected to the second terminal of the fifth resistor;

[0028] The first end of the fifth resistor is connected to the base of the second transistor and the second end of the third resistor;

[0029] The first end of the third resistor is connected to the emitter and power supply terminal of the second transistor, and serves as the fifth terminal of the power output control circuit.

[0030] The collector of the second transistor is connected to the first end of the seventh resistor and the gate of the second MOS transistor, the drain of the second MOS transistor is connected to the second end of the fifth connector, and the source of the second MOS transistor serves as the fourth end of the power output control circuit.

[0031] The first end of the fifth connector serves as the third end of the power output control circuit, and the connecting end of the fifth connector serves as the second end of the power output control circuit.

[0032] According to the locking and engaging testing fixture provided by this utility model, the current acquisition circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and an operational amplifier, wherein:

[0033] The tenth resistor and the thirteenth resistor are connected in series, and the eleventh resistor and the twelfth resistor are connected in series;

[0034] The first end of the ninth resistor is connected to the first end of the tenth resistor and serves as the first end of the current acquisition circuit; the second end of the ninth resistor is connected to the first end of the eleventh resistor and serves as the second end of the current acquisition circuit.

[0035] The second end of the twelfth resistor is connected to the inverting input of the operational amplifier, the second end of the thirteenth resistor is connected to the non-inverting input of the operational amplifier, and the output of the operational amplifier is connected to the first input of the microcontroller.

[0036] According to the locking and engaging testing fixture provided by this utility model, the voltage divider acquisition circuit includes: a fifteenth resistor and a sixteenth resistor, wherein:

[0037] The fifteenth resistor and the sixteenth resistor are connected in series, and the connection point is connected to the second input terminal of the microcontroller.

[0038] The voltage divider acquisition circuit is used to acquire the voltage divider corresponding to the series connection point; the microcontroller is used to determine the battery voltage based on the voltage divider, the fifteenth resistor, and the sixteenth resistor.

[0039] This utility model also provides a locking control device, including: an electric screwdriver, a battery, and a locking position test fixture as described in any of the above.

[0040] The locking-in testing fixture and locking control device provided by this utility model, during the process of fastening the OT terminal to the aluminum plate of the battery using fasteners, the detection unit collects the voltage division and sampling current before and after battery charging to determine the switch control signal used to characterize whether the fastener has properly locked the OT terminal and aluminum plate. The control unit controls the on / off state between the electric screwdriver and the mains power supply according to the level of the switch control signal, thereby controlling whether the electric screwdriver continues to work or stops working. In this utility model, by detecting the locking-in in real time, the electric screwdriver is stopped in time, avoiding situations where screws cannot be tightened or stripped, improving the accuracy and efficiency of locking-in detection, and thus reducing the product defect rate. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the locking and fastening positioning test fixture provided in this embodiment of the utility model.

[0043] Figure 2 This is a schematic diagram of the detection unit provided in an embodiment of the present invention.

[0044] Figure 3 This is a schematic diagram of the detection circuit provided in an embodiment of the present invention.

[0045] Figure 4 This is a schematic diagram of the control unit provided in an embodiment of the present invention.

[0046] Figure 5 This is a schematic diagram of the connection of the OT terminal provided in an embodiment of this utility model.

[0047] Figure 6 This is a schematic diagram of the locking control device provided in an embodiment of the present invention.

[0048] Figure label:

[0049] 100: Locking position test fixture; 110: Detection unit; 120: Control unit; 121: First switch circuit; 122: Second switch circuit; 130: Detection circuit; 131: Current acquisition circuit; 132: Voltage divider acquisition circuit; 133: Power output control circuit; 140: Microcontroller; 200: Electric screwdriver; 300: Battery; 400: OT terminal. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0051] To address the problem of low screw fastening accuracy in existing technologies, which leads to a high product defect rate, this utility model provides a fastening accuracy testing fixture. Figure 1 This is a schematic diagram of the locking and fastening positioning test fixture provided in this embodiment of the utility model. Figure 1 As shown, the locking position test fixture 100 includes a detection unit 110 and a control unit 120.

[0052] The detection unit 110 is connected to the control unit 120; the detection unit 110 is used to determine the switch control signal AC220V_OUT_CRT based on the voltage division and sampling current of the battery 300 before and after charging when the OT terminal 400 is connected; the OT terminal 400 is fastened to the aluminum plate of the battery 300 by fasteners; the switch control signal AC220V_OUT_CRT is used to indicate whether the fasteners have locked the OT terminal 400 and the aluminum plate in place.

[0053] The control unit 120 is used to control the on / off state between the electric screwdriver 200 and the mains power supply based on the switch control signal AC220V_OUT_CRT when the electric screwdriver 200 is connected to the mains power supply, so as to control the working state of the electric screwdriver 200.

[0054] Specifically, during the process of the electric screwdriver 200 tightening the fastener to secure the OT terminal 400 to the aluminum plate of the battery 300, the detection unit 110 collects the voltage and sampling current of the battery 300 before charging, and the voltage and sampling current of the battery 300 after charging. Based on the voltage differences of the battery 300 before and after charging, the battery voltage before and after charging is determined. Then, combining the battery voltage and sampling current before and after charging, a switch control signal AC220V_OUT_CRT is determined. This switch control signal AC220V_OUT_CRT is used to control the on / off state between the electric screwdriver 200 and the mains power supply, thereby controlling the working state of the electric screwdriver 200. The mains power supply is used to power the electric screwdriver 200. For example, when the switch control signal AC220V_OUT_CRT is low, it indicates that the electric screwdriver 200 has secured the OT terminal 400 and the aluminum plate to the correct position by screwing in the fastener. At this time, the connection between the electric screwdriver 200 and the mains power supply can be disconnected, that is, the mains power supply is stopped from supplying power to the electric screwdriver 200, so that the electric screwdriver 200 is in a non-working state, that is, the electric screwdriver 200 stops screwing in the fastener to avoid stripping the fastener threads. When the switch control signal AC220V_OUT_CRT is high, it indicates that the electric screwdriver 200 has not yet secured the OT terminal 400 and the aluminum plate to the correct position after screwing in the fastener. At this time, the connection between the electric screwdriver 200 and the mains power supply can be kept open, that is, the mains power supply continues to supply power to the electric screwdriver 200, keeping the electric screwdriver 200 in working condition. This prevents the OT terminal 400 from being incompletely secured to the aluminum plate due to insufficient screwing in of the fastener, resulting in poor contact.

[0055] Optionally, the fastener can be a screw or a combination of a screw and a nut, and this embodiment of the present invention does not limit this.

[0056] The locking and fastening testing fixture provided by this utility model, during the process of fastening the OT terminal 400 to the aluminum plate of the battery 300 by fasteners, the detection unit 110 collects the voltage division and sampling current of the battery 300 before and after charging to determine the switch control signal AC220V_OUT_CRT used to characterize whether the fastener has locked the OT terminal 400 and the aluminum plate in place. The control unit 120 controls the on / off state between the electric screwdriver 200 and the mains power supply according to the level state of the switch control signal AC220V_OUT_CRT, thereby controlling the electric screwdriver 200 to continue working or stop working. In this utility model, by detecting the locking and fastening in real time, the electric screwdriver 200 is controlled to stop working in a timely manner, avoiding the situation where the screw cannot be tightened or the thread is stripped, improving the detection accuracy and efficiency of locking and fastening, thereby reducing the product defect rate.

[0057] Furthermore, Figure 2 This is a schematic diagram of the detection unit provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the detection unit 110 includes a detection circuit 130 and a microcontroller 140.

[0058] The microcontroller 140 is connected to the detection circuit 130 and the control unit 120. The detection circuit 130 is also connected to the power adapter, the OT terminal 400 and the battery 300.

[0059] The microcontroller 140 is used to generate a charging control signal CHARGE_CRT; the level of the charging control signal CHARGE_CRT is used to control whether the mains power supply charges the battery 300 through the power adapter.

[0060] The detection circuit 130 is used to collect the voltage divider and sampling current of the battery 300 before and after charging based on the charging control signal CHARGE_CRT.

[0061] The microcontroller 140 is used to determine the battery voltage before and after charging based on the voltage divider voltage before and after charging; to determine the charging current before and after charging based on the sampled current before and after charging; to determine the impedance between the OT terminal 400 and the aluminum plate based on the battery voltage and charging current before and after charging; and to determine the switch control signal AC220V_OUT_CRT based on the impedance.

[0062] Specifically, when a locking detection is required, the microcontroller 140 generates a charging control signal CHARGE_CRT. This signal controls whether the AC power supply charges the battery 300 through the power adapter. For example, when CHARGE_CRT is low, the AC power supply does not charge the battery 300 through the power adapter; when CHARGE_CRT is high, the AC power supply charges the battery 300 through the power adapter. When the mains power supply is not charging the battery 300, that is, before the battery 300 is charged, the detection circuit 130 can collect the voltage divider voltage U_BAT_DET0 and the sampling current CURRENT_DET0 before charging. After the mains power supply charges the battery 300, the detection circuit 130 collects the voltage divider voltage U_BAT_DET1 and the sampling current CURRENT_DET1 after charging, and sends the voltage divider voltage U_BAT_DET0 and the sampling current CURRENT_DET0 before charging, as well as the voltage divider voltage U_BAT_DET1 and the sampling current CURRENT_DET1 after charging, to the microcontroller 140. In the microcontroller 140, the battery voltage V0 before charging can be calculated using the voltage divider voltage U_BAT_DET0 before charging, the battery voltage V1 after charging can be calculated using the voltage divider voltage U_BAT_DET1 after charging, the charging current I0 before charging can be calculated using the sampling current CURRENT_DET0 before charging, and the charging current I1 after charging can be calculated using the sampling current CURRENT_DET1 after charging. Then, using equation (1), the impedance between the OT terminal 400 and the aluminum plate can be calculated using the battery voltage V0 and charging current I0 before charging, and the battery voltage V1 and charging current I1 after charging. Equation (1) is:

[0063] R = (V1 - V0) / (I1 - I0).

[0064] Where R represents the impedance between the OT terminal 400 and the aluminum plate.

[0065] After determining the impedance between the OT terminal 400 and the aluminum plate, this impedance can be compared with an impedance threshold. Based on the comparison result, a corresponding switch control signal AC220V_OUT_CRT is generated. This switch control signal AC220V_OUT_CRT is used to determine whether the fastener has properly secured the OT terminal 400 and the aluminum plate. For example, if the comparison result shows an impedance greater than the impedance threshold, it indicates that the fastener has not properly secured the OT terminal 400 and the aluminum plate. In this case, the generated switch control signal AC220V_OUT_CRT can be a high-level signal, causing the control unit 120 to control the electric screwdriver 200 to continue working. If the comparison result shows an impedance less than the impedance threshold, it indicates that the fastener has properly secured the OT terminal 400 and the aluminum plate. In this case, the generated switch control signal AC220V_OUT_CRT can be a low-level signal, causing the control unit 120 to control the electric screwdriver 200 to stop working.

[0066] Furthermore, Figure 3 This is a schematic diagram of the detection circuit provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the detection circuit 130 includes: a current acquisition circuit 131, a voltage divider acquisition circuit 132, and a power output control circuit 133.

[0067] The first terminal of the power output control circuit 133 is connected to the first output terminal of the microcontroller 140, and is used to receive the charging control signal CHARGE_CRT sent by the microcontroller 140; the second terminal of the power output control circuit 133 is connected to the battery 300; the third terminal of the power output control circuit 133, POWER+, is connected to the power adapter; the fourth terminal of the power output terminal is connected to the first terminal of the current acquisition circuit 131; the fifth terminal of the power output control circuit 133 is connected to the power supply terminal; the charging control signal CHARGE_CRT is used to control the on / off state of the power output control circuit 133.

[0068] The second terminal POWER- of the current acquisition circuit 131 is connected to the power adapter, and the third terminal of the current acquisition circuit 131 is connected to the first input terminal of the microcontroller 140. The current acquisition circuit 131 is used to acquire the sampling current of the battery 300 before and after charging based on the on / off state of the power output control circuit 133.

[0069] The first end of the voltage divider acquisition circuit 132 is connected to the OT terminal 400, and the second end of the voltage divider acquisition circuit 132 is connected to the second input terminal of the microcontroller 140; the voltage divider acquisition circuit 132 is used to acquire the voltage divider voltage of the battery 300 before and after charging.

[0070] Specifically, after receiving the charging control signal CHARGE_CRT sent by the microcontroller 140, the power output control circuit 133 can control the on / off state of the power output control circuit 133. For example, when the charging control signal CHARGE_CRT is a low-level signal, the power output control circuit 133 is in the off state, and at this time, the mains power supply does not charge the battery 300. When the charging control signal CHARGE_CRT is a high-level signal, the power output control circuit 133 is in the on state, and at this time, the mains power supply charges the battery 300. When the power output control circuit 133 is in the off state, the current acquisition circuit 131 acquires the sampling current I0 of the battery 300 before charging, and the voltage divider acquisition circuit 132 acquires the voltage divider voltage U_BAT_DET0 of the battery 300 before charging. When the power output control circuit 133 is in the on state, the current acquisition circuit 131 acquires the sampling current I1 after the battery 300 is charged, and the voltage divider acquisition circuit 132 acquires the voltage divider voltage U_BAT_DET1 after the battery 300 is charged.

[0071] Furthermore, such as Figure 3 As shown, the power output control circuit 133 includes a second transistor Q2, a third transistor Q3, a second MOSFET Q4, a third resistor R3, a fifth resistor R5, a seventh resistor R7, an eighth resistor R8, and a fifth connector J5.

[0072] The first end of the eighth resistor R8 is connected to the base of the third transistor Q3 and serves as the first end of the power output control circuit 133. The second end of the eighth resistor R8 is connected to the emitter of the third transistor Q3 and the second end of the seventh resistor R7, and both are grounded.

[0073] The collector of the third transistor Q3 is connected to the second terminal of the fifth resistor R5.

[0074] The first end of the fifth resistor R5 is connected to the base of the second transistor Q2 and the second end of the third resistor R3.

[0075] The first end of the third resistor R3 is connected to the emitter and power supply terminal of the second transistor Q2, and serves as the fifth terminal of the power output control circuit 133.

[0076] The collector of the second transistor Q2 is connected to the first end of the seventh resistor R7 and the gate of the second MOSFET Q4. The drain of the second MOSFET Q4 is connected to the second end of the fifth connector J5. The source of the second MOSFET Q4 serves as the fourth end of the power output control circuit 133.

[0077] The first end of the fifth connector J5 serves as the third end of the power output control circuit 133, and the connecting end of the fifth connector J5 serves as the second end of the power output control circuit 133.

[0078] Specifically, when the charging control signal CHARGE_CRT is low, the third transistor Q3 is off, causing a high-level signal to be input to the base of the second transistor Q2, thus turning Q2 off. Then, since the second MOSFET Q4 is an NMOS transistor, its gate is pulled down to a low level by the seventh resistor R7, turning Q4 off and preventing the mains power supply from charging battery 300. When the charging control signal CHARGE_CRT is high, the third transistor Q3 is on, causing a low-level signal to be input to the base of the second transistor Q2, thus turning Q2 on. Then, the gate of the second MOSFET Q4 is pulled up to a high level, and the gate-source voltage V of the second MOSFET Q4... GS A value greater than 0 will cause the second MOSFET Q4 to be turned on, thereby allowing the AC power supply to charge the battery 300.

[0079] Furthermore, such as Figure 3 As shown, the current acquisition circuit 131 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and an operational amplifier U1, wherein:

[0080] The tenth resistor R10 and the thirteenth resistor R13 are connected in series, and the eleventh resistor R11 and the twelfth resistor R12 are connected in series.

[0081] The first end of the ninth resistor R9 is connected to the first end of the tenth resistor R10 and serves as the first end of the current acquisition circuit 131. The second end of the ninth resistor R9 is connected to the first end of the eleventh resistor R11 and serves as the second end of the current acquisition circuit 131.

[0082] The second end of the twelfth resistor R12 is connected to the inverting input of the operational amplifier U1, the second end of the thirteenth resistor R13 is connected to the non-inverting input of the operational amplifier U1, and the output of the operational amplifier U1 is connected to the first input of the microcontroller 140.

[0083] After the current acquisition circuit 131 acquires the sampling current CURRENT_DET0 before charging the battery 300 and the sampling current CURRENT_DET1 after charging the battery 300, the microcontroller 140 can use the ninth resistor R9 to calculate the charging current before and after charging the battery 300. The charging current I0 before charging the battery 300 can be I0=CURRENT_DET0 / (50×R9), and the charging current I1 after charging the battery 300 can be I1=CURRENT_DET1 / (50×R9), where 50 represents the gain of the operational amplifier U1.

[0084] Furthermore, such as Figure 3 As shown, the voltage divider acquisition circuit 132 includes: a fifteenth resistor R15 and a sixteenth resistor R16, wherein:

[0085] The fifteenth resistor R15 and the sixteenth resistor R16 are connected in series, and the connection point is connected to the second input terminal of the microcontroller 140.

[0086] The voltage divider acquisition circuit 132 is used to acquire the voltage divider corresponding to the series connection point; the microcontroller 140 is used to determine the battery voltage 300 based on the voltage divider, the fifteenth resistor R15 and the sixteenth resistor R16.

[0087] Specifically, after acquiring the voltage divider voltage U_BAT_DET0 before charging and the voltage divider voltage U_BAT_DET1 after charging of battery 300 through the voltage divider acquisition circuit 132, the microcontroller 140 can use the fifteenth resistor R15 and the sixteenth resistor R16 to calculate the battery voltage before and after charging. The battery voltage V0 before charging can be V0 = U_BAT_DET0(R15+R16) / R16, and the battery voltage V1 after charging can be V1 = U_BAT_DET1(R15+R16) / R16. Furthermore, the voltage divider acquisition circuit 132 is also connected to a fourth connector.

[0088] Furthermore, Figure 4 This is a schematic diagram of the structure of the control unit provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the control unit 120 includes a first switching circuit 121 and a second switching circuit 122.

[0089] The first terminal of the first switch circuit 121 is connected to the second output terminal of the microcontroller 140 and is used to receive the switch control signal AC220V_OUT_CRT sent by the microcontroller 140; the second terminal of the first switch circuit 121 is connected to the power supply terminal, and the third terminal of the first switch circuit 121 is connected to the first terminal of the second switch circuit 122; the switch control signal AC220V_OUT_CRT is used to control the on / off state of the first switch circuit 121.

[0090] The second terminal of the second switching circuit 122 is connected to the mains power supply, and the third terminal of the second switching circuit 122 is connected to the electric screwdriver 200; the on / off state of the first switching circuit 121 is used to control the on / off state between the mains power supply and the electric screwdriver 200.

[0091] Specifically, when the switch control signal AC220V_OUT_CRT is low, the first switch circuit 121 is turned on, thereby controlling the second switch circuit 122 to be turned off. This indicates that the fastener has secured the OT terminal 400 and the aluminum plate, and the connection between the mains power supply and the electric screwdriver 200 is broken, causing the electric screwdriver 200 to stop working. When the switch control signal AC220V_OUT_CRT is high, the first switch circuit 121 is turned off, thereby controlling the second switch resistor to remain on. This indicates that the fastener has not yet secured the OT terminal 400 and the aluminum plate, and the connection between the mains power supply and the electric screwdriver 200 remains open, allowing the screwdriver to continue working.

[0092] Furthermore, such as Figure 4 As shown, the first switching circuit 121 includes a first resistor R1, a second resistor R2, and a first MOSFET Q1, wherein:

[0093] The first end of the first resistor R1 serves as the first end of the first switching circuit 121. The second end of the first resistor R1 is connected to the first end of the second resistor R2 and the gate of the first MOSFET Q1. The second end of the second resistor R2 is connected to the source of the first MOSFET Q1 and serves as the second end of the first switching circuit 121. The drain of the first MOSFET Q1 serves as the third end of the first switching circuit 121.

[0094] Furthermore, such as Figure 4 As shown, the second switching circuit 122 includes a fourth resistor R4, a diode D2, a first capacitor C1, a relay K1, a first connector J1, and a second connector J2, wherein:

[0095] The first end of the fourth resistor R4 is connected to the positive terminal of the diode D2 and the primary negative terminal of the relay K1, and serves as the first terminal of the second switching circuit 122; the second end of the fourth resistor R4 is grounded; the negative terminal of the diode D2 is connected to the power supply terminal, the primary positive terminal of the relay K1, and the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded; the secondary switch in the relay K1 is set on the live wire L_IN between the first connector J1 and the second connector J2, and the on / off state of the secondary switch is used to control the on / off state of the live wire L_IN between the first connector J1 and the second connector J2, so as to control whether the mains power supply provides power output to the electric screwdriver 200;

[0096] The first connector J1 is connected to the mains power supply and is connected to the second connector J2 via a neutral wire and a ground wire. The second connector J2 is also connected to the electric screwdriver 200.

[0097] Specifically, in the second switching circuit 122, relay K1 includes a primary coil and a secondary switch. When the switch control signal AC220V_OUT_CRT is high, the first MOSFET Q1 is off. At this time, there is a voltage difference between the positive and negative terminals of diode D2, thereby energizing the primary coil. The energized primary coil generates a magnetic field, which attracts the second and fourth pins of the secondary switch, maintaining the connection between the mains power supply and the live wire L_IN of the electric screwdriver 200. That is, the mains power supply can power the electric screwdriver 200, allowing it to continue tightening the fastener. When the switch control signal AC220V_OUT_CRT is low, the first MOSFET Q1 is in the on state. At this time, the power supply pulls the positive terminal of diode D2 to a high level, making the voltage across the positive and negative terminals of diode D2 equal. This de-energizes the primary coil in relay K1, preventing it from generating a magnetic field. Consequently, the third and fourth pins of the secondary switch are connected, disconnecting the live wire L_IN between the mains power supply and the electric screwdriver 200. In other words, the mains power supply stops supplying power to the electric screwdriver 200, causing the electric screwdriver 200 to stop working.

[0098] Figure 5 This is a connection diagram of the OT terminal provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the OT terminal 400 is supplied as a single unit with the second cable, which includes a third cable and a fourth cable. Specifically, in the power output control circuit 133, the fifth connector J5 is connected to the battery 300 via the third cable. The fourth cable is the battery 300 voltage acquisition line, and the fourth connector is connected to the battery 300 via the fourth cable and the first connector J1.

[0099] This utility model embodiment also provides a locking control device. Figure 6 This is a schematic diagram of the locking control device provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the locking control device includes: an electric screwdriver 200, a battery 300, and a locking position test fixture 100 as described in any of the above.

[0100] The locking and securing test fixture 100 is connected to AC power and also connects to the electric screwdriver body of the electric screwdriver 200 via a first cable and to the OT terminal 400 via a second cable. The electric screwdriver 200 includes an electric screwdriver body and a rotating head. By screwing in the screw, it secures the OT terminal 400 and the aluminum plate to the battery 300. The battery 300 includes cell electrodes and a battery body, with the aluminum plate disposed on the cell electrodes.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lock-to-place test fixture, characterized by, include: The detection unit and the control unit, wherein: The detection unit is connected to the control unit; the detection unit is used to determine the switch control signal based on the voltage divider and the sampled current before and after battery charging when the OT terminal is connected; the OT terminal is fastened to the aluminum plate of the battery by fasteners; the switch control signal is used to indicate whether the fasteners have secured the OT terminal and the aluminum plate in place; The control unit is used to control the on / off state between the electric screwdriver and the mains power supply based on the switch control signal when the electric screwdriver is connected to the mains power supply, so as to control the working state of the electric screwdriver.

2. The lock-to-place test fixture of claim 1, wherein, The detection unit includes a detection circuit and a microcontroller, wherein: The microcontroller is connected to the detection circuit and the control unit. The detection circuit is also connected to the power adapter, the OT terminal, and the battery. The microcontroller is used to generate a charging control signal; the level of the charging control signal is used to control whether the mains power supply charges the battery through the power adapter. The detection circuit is used to acquire the voltage divider and sampling current of the battery before and after charging based on the charging control signal; The microcontroller is used to determine the battery voltage before and after charging based on the voltage divider voltage before and after charging; to determine the charging current before and after charging based on the sampled current before and after charging; to determine the impedance between the OT terminal and the aluminum plate based on the battery voltage and charging current before and after charging; and to determine the switch control signal based on the impedance.

3. The lock-to-place test fixture of claim 2, wherein, The control unit includes a first switching circuit and a second switching circuit, wherein: The first terminal of the first switching circuit is connected to the second output terminal of the microcontroller and is used to receive the switching control signal sent by the microcontroller; the second terminal of the first switching circuit is connected to the power supply terminal, and the third terminal of the first switching circuit is connected to the first terminal of the second switching circuit; the switching control signal is used to control the on / off state of the first switching circuit. The second terminal of the second switching circuit is connected to the mains power supply, and the third terminal of the second switching circuit is connected to the electric screwdriver; the on / off state of the first switching circuit is used to control the on / off state between the mains power supply and the electric screwdriver.

4. The lock-to-place test fixture of claim 3, wherein, The first switching circuit includes a first resistor, a second resistor, and a first MOSFET, wherein: The first end of the first resistor serves as the first end of the first switching circuit; the second end of the first resistor is connected to the first end of the second resistor and the gate of the first MOS transistor; the second end of the second resistor is connected to the source of the first MOS transistor and serves as the second end of the first switching circuit; the drain of the first MOS transistor serves as the third end of the first switching circuit.

5. The lock-to-place test fixture of claim 3, wherein, The second switching circuit includes a fourth resistor, a diode, a first capacitor, a relay, a first connector, and a second connector, wherein: The first end of the fourth resistor is connected to the positive terminal of the diode and the primary negative terminal of the relay, and serves as the first terminal of the second switching circuit; the second end of the fourth resistor is grounded; the negative terminal of the diode is connected to the power supply terminal, the primary positive terminal of the relay, and the first terminal of the first capacitor, and the second terminal of the first capacitor is grounded; the secondary switch in the relay is located on the live wire between the first connector and the second connector, and the on / off state of the secondary switch is used to control the on / off state of the live wire between the first connector and the second connector, so as to control whether the mains power supply provides power output to the electric screwdriver; The first connector is connected to the mains power supply and is connected to the second connector via a neutral wire and a ground wire. The second connector is also connected to the electric screwdriver.

6. The lock-to-place test fixture of claim 2, wherein, The detection circuit includes: a current acquisition circuit, a voltage divider acquisition circuit, and a power output control circuit, wherein: The first terminal of the power output control circuit is connected to the first output terminal of the microcontroller and is used to receive the charging control signal sent by the microcontroller; the second terminal of the power output control circuit is connected to the battery; the third terminal of the power output control circuit is connected to the power adapter; the fourth terminal of the power output terminal is connected to the first terminal of the current acquisition circuit; the fifth terminal of the power output control circuit is connected to the power supply terminal; the charging control signal is used to control the on / off state of the power output control circuit. The second terminal of the current acquisition circuit is connected to the power adapter, and the third terminal of the current acquisition circuit is connected to the first input terminal of the microcontroller; the current acquisition circuit is used to acquire the sampled current of the battery before and after charging based on the on / off state of the power output control circuit. The first end of the voltage divider acquisition circuit is connected to the OT terminal, and the second end of the voltage divider acquisition circuit is connected to the second input terminal of the microcontroller; the voltage divider acquisition circuit is used to acquire the voltage divider voltage before and after the battery is charged.

7. The lock-to-place test fixture of claim 6, wherein, The power output control circuit includes a second transistor, a third transistor, a second MOSFET, a third resistor, a fifth resistor, a seventh resistor, an eighth resistor, and a fifth connector, wherein: The first end of the eighth resistor is connected to the base of the third transistor and serves as the first end of the power output control circuit. The second end of the eighth resistor is connected to the emitter of the third transistor and the second end of the seventh resistor, and both are grounded. The collector of the third transistor is connected to the second terminal of the fifth resistor; The first end of the fifth resistor is connected to the base of the second transistor and the second end of the third resistor; The first end of the third resistor is connected to the emitter and power supply terminal of the second transistor, and serves as the fifth terminal of the power output control circuit. The collector of the second transistor is connected to the first end of the seventh resistor and the gate of the second MOS transistor, the drain of the second MOS transistor is connected to the second end of the fifth connector, and the source of the second MOS transistor serves as the fourth end of the power output control circuit. The first end of the fifth connector serves as the third end of the power output control circuit, and the connecting end of the fifth connector serves as the second end of the power output control circuit.

8. The lock-to-place test fixture of claim 6, wherein, The current acquisition circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and an operational amplifier, wherein: The tenth resistor and the thirteenth resistor are connected in series, and the eleventh resistor and the twelfth resistor are connected in series; The first end of the ninth resistor is connected to the first end of the tenth resistor and serves as the first end of the current acquisition circuit; the second end of the ninth resistor is connected to the first end of the eleventh resistor and serves as the second end of the current acquisition circuit. The second end of the twelfth resistor is connected to the inverting input of the operational amplifier, the second end of the thirteenth resistor is connected to the non-inverting input of the operational amplifier, and the output of the operational amplifier is connected to the first input of the microcontroller.

9. The lock-to-place test fixture of claim 6, wherein, The voltage divider acquisition circuit includes: a fifteenth resistor and a sixteenth resistor, wherein: The fifteenth resistor and the sixteenth resistor are connected in series, and the connection point is connected to the second input terminal of the microcontroller. The voltage divider acquisition circuit is used to acquire the voltage divider corresponding to the series connection point; the microcontroller is used to determine the battery voltage based on the voltage divider, the fifteenth resistor, and the sixteenth resistor.

10. A lock control device characterized by comprising: include: An electric screwdriver, a battery, and a locking position test fixture as described in any one of claims 1-9.

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