Safety monitoring system for split type electrical equipment

Abstract

The present invention relates to the technical field of safety monitoring systems, and specifically to a safety monitoring system for split-type electrical equipment, comprising an electric tool and a bracket for placing the electric tool, wherein the electric tool adopts wireless charging; a safety and module is also provided on the electric tool, specifically comprising a bracket monitoring module, a hands-off monitoring module, an internal power supply module, and a control module, wherein the control module is connected to a power switch via first, second, and third isolation drive circuits connected in series; the first isolation drive circuit is connected to the hands-off monitoring module, the second isolation drive circuit is connected to the bracket monitoring module, and the third isolation drive circuit is connected to the internal power supply module; the transformer input is connected to a rechargeable battery and a power switch, and the output is connected to the power supply circuit of the electric tool; the system can ensure that the electric tool is not turned on in the event of a fault or abnormal state, and is always directed to the safe side during operation, thereby avoiding safety hazards caused by factors such as heating or high-speed rotation of the electric tool.

Description

Technical Field

[0001] The invention relates to the technical field of safety monitoring systems, in particular to a safety monitoring system for split-type electrical equipment. Background Art

[0002] In work and production, electric tools are widely used. Through manual operation, many complex tasks or emergency tasks that cannot be completed by automated machinery can be completed, including but not limited to electric soldering irons, hot air guns, arc welding tongs, hair dryers, electric engraving knives, ultrasonic engraving knives, ion air guns, etc.; However, when the operator leaves the tool and the tool is still in the working state and is not in standby or stopped, some safety accidents may usually occur. In actual use, these devices usually have the following problems: 1. These devices usually provide functions such as high temperature, high-speed rotation, and high voltage. They should stop when not operated by human hands. If the personnel leave and forget to turn on the pipe wall switch, the tool will still be in operation, which will bring safety problems; 2. In the prior art, a single working time is usually controlled by a controller to avoid the danger caused by electrical failure due to long-term working. However, it is not possible to immediately stop or enter standby mode after a person lets go of the device during a single working time, and there are still safety issues in use. 3. The existing technology does not take into account the problem of protection circuit failure. When the protection circuit fails, it is impossible to stop the power tool from running or stopping heating in time, and the safety level is low. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a safety monitoring system for split-type electrical equipment that can prevent safety hazards caused by high temperature, high-speed rotation, high voltage and other functions of power tools when unattended.

[0004] The technical solution adopted by the present invention to solve its technical problem is: A safety monitoring system for split-type electrical equipment comprises a power supply module for power supply, an electric tool and a bracket for placing the electric tool, wherein the bracket is provided with a wireless charging transmitting module, and the wireless charging transmitting module is connected to the power supply module; the electric tool is provided with a rechargeable battery and a wireless charging receiving module 11 connected to the rechargeable battery; the rechargeable battery is connected to the power supply circuit of the electric tool through a safety and module, and the safety and module comprises a bracket monitoring module, a wireless charging transmitting module, and a wireless charging receiving module 11 used as a bracket monitoring module to detect whether the electric tool is placed on the bracket; a hands-off monitoring module to detect whether the electric tool is off the hand; a control module, wherein the control module is connected to a power switch through a first isolation drive circuit, a second isolation drive circuit, and a third isolation drive circuit arranged in series; the first isolation drive circuit input is connected to the hands-off monitoring module, and the second isolation drive circuit input is connected to the bracket monitoring module; an internal power supply module, wherein the input is connected to the rechargeable battery, and the output is connected to the hands-off monitoring module, the control module, the first isolation drive circuit, the second isolation drive circuit, and the third isolation drive circuit; a transformer, wherein the input is connected to the rechargeable battery and the power switch, and the output is connected to the power supply circuit of the electric tool.

[0005] Preferably, a further technical solution of the present invention is: Preferably, the hands-off monitoring module includes a plurality of capacitive sensors, a signal processing module and a data analysis and processing module. The plurality of capacitive sensors are installed on the handle of the power tool at circumferential intervals. The plurality of capacitive sensors are connected to the signal processing module. The output of the signal processing module is connected to the data analysis and processing module. The output of the data analysis and processing module is connected to the first isolation drive circuit.

[0006] Preferably, at least four capacitive sensors are provided, and when greater than or equal to 2 / 3 of the capacitive sensors detect a capacitance change, the data analysis and processing module controls the output of a first start signal to the first isolation drive circuit.

[0007] Preferably, a feedback isolation circuit is further included, and the output end of the transformer is connected to the control module via the feedback isolation circuit.

[0008] Preferably, the first isolation driving circuit outputs a first state recovery signal, and the second isolation driving circuit outputs a first state recovery signal; the first state recovery signal is used to drive the hand-off state display light or transmit it back to the control module, and the second state recovery signal is used to drive the bracket state display light or transmit it back to the control module.

[0009] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: This system can ensure that the power supply circuit of the power tool is not turned on when there is a circuit failure or abnormal state (no hand grip). The system always guides the power tool to the safe side during operation, avoiding safety hazards caused by factors such as heating or high-speed rotation of the power tool. The specific functions are as follows: 1. When the electric tool is placed in the bracket, the bracket monitoring module detects that the electric tool is placed in the bracket, the second isolation drive circuit will not receive the second start signal, the second isolation drive circuit has no output, the first isolation drive circuit, the second isolation drive circuit, and the third isolation drive circuit connected in parallel in the safety module have no output, and the power switch cannot be driven to output a pulse signal of a certain frequency, and the electric tool enters a shutdown or standby state; 2. When the power tool is not placed in the bracket, but less than 2 / 3 of the capacitance sensors detect capacitance changes, the first isolation drive circuit has no output and cannot drive the power switch in the safety and module to output a pulse signal of a certain frequency, and the power tool enters the shutdown or standby state; 3. When a short circuit or open circuit occurs inside the safety and module, the power switch in the safety and module cannot be driven to output a pulse signal of a certain frequency, and the power tool enters the shutdown or standby state. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the safety module in an embodiment of the present invention; Figure 2 is a safety and module workflow diagram in an embodiment of the present invention; Figure 3 is a schematic diagram of the structure of the wireless charging transmitting module and the wireless charging receiving module 11 in an embodiment of the present invention; Figure 4 is a schematic diagram of the circuit structure of a first isolation driving circuit in an embodiment of the present invention; Figure 5 is a schematic diagram of the circuit structure of a third isolation drive circuit in an embodiment of the present invention; Figure 6 is a schematic diagram of the circuit structure of a control module in an embodiment of the present invention; Figure 7 It is a schematic diagram of the circuit structure of the power switch according to an embodiment of the present invention;.

[0011] Explanation of the accompanying drawings: 1. Rechargeable battery; 2. Internal power supply module; 3. Control module; 4. Hand-off monitoring module; 5. First isolation drive circuit; 6. Second isolation drive circuit; 7. Third isolation drive circuit; 8. Power switch; 9. Transformer; 11. Wireless charging receiving module 11; 12. Feedback isolation circuit; 13. Energy path selection module; 14. Converter; 15. Bridge circuit; 16. Transmitting coil; 17. Receiving coil. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with specific embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0013] like Figure 1 , Figures 4 to 6 As shown, this embodiment provides a safety monitoring system for split-type electrical equipment, including a power supply module for power supply, an electric tool and a bracket for placing the electric tool. The power supply module can use AC power or batteries. A wireless charging transmitter module is provided on the bracket, and the wireless charging transmitter module is connected to the power supply module; a rechargeable battery 1 and a wireless charging receiving module 11 connected to the rechargeable battery 1 are provided on the electric tool; the rechargeable battery 1 is connected to the power supply circuit of the electric tool through a safety module, and the safety module includes a bracket monitoring module. In this embodiment, the wireless charging transmitter module and the wireless charging receiving module 11 are used as bracket monitoring modules to detect whether the electric tool is placed on the bracket; a hand-off monitoring module 4 is used to detect whether the electric tool is out of hand; the hand-off monitoring module 4, used to detect whether the power tool is out of hand; internal power supply module 2, connected to rechargeable battery 1, for safety and internal modules to power; control module 3, control module 3 is connected to power switch 8 through the first isolation drive circuit 5, second isolation drive circuit 6, and third isolation drive circuit 7 arranged in series; the first isolation drive circuit 5 input is connected to the hand-off monitoring module 4, and the second isolation drive circuit 6 input is connected to the bracket monitoring module; internal power supply module 2, input connected to rechargeable battery, hand-off monitoring module 4, control module 3, first isolation drive circuit 5, second isolation drive circuit 6, and third isolation drive circuit 7 are all connected to the output of internal power supply module 2; transformer 9, input connected to rechargeable battery 1 and power switch 8, and output connected to the power supply circuit of the power tool. Among them, the power module is connected to the wireless charging transmitter module through a rectifier and filter circuit. In this embodiment, the main control chip of the control module 3 can adopt UC2843, the first isolation drive circuit 5 and the second isolation drive circuit 6 can adopt MOCD207R2M optical coupling clutch, the first isolation drive circuit 5 can adopt ACPL-P346-060E gate drive photocoupler, and the power switch 8 can adopt mosfet, such as FDMS86104.

[0014] like Figure 2As shown, the working process of the system is as follows: every preset certain time period (in this embodiment, this time period is preset to 2 minutes), the hands-off monitoring module 4 is used to determine whether the power tool is released from the hand; if so, the bracket monitoring module is used to determine whether it enters the bracket; if so, the system enters the standby mode, and after a preset delay time (set to 10 minutes in this embodiment), the power supply circuit of the power tool is powered off; if it does not enter the bracket, the power supply circuit of the power tool is immediately powered off; when the power tool is in the hand, the bracket monitoring module is used to determine whether it enters the bracket; if it enters the bracket, the system fails and the power supply circuit of the power tool is immediately powered off; if it does not enter the bracket, a round of judgment is continued every 2 minutes.

[0015] like Figure 3 As shown, the wireless charging transmitter module and the wireless charging receiver module 11 transfer energy through electromagnetic induction, and the first near field communication module and the second near field communication module 11 can perform near field communication according to a preset communication protocol (such as Qi protocol). The data format of a frame is defined in the Qi protocol as "synchronization header + data header + data segment + checksum", in which, except for the synchronization header, each byte of data has its own parity check, and all are in 11-bit format. By comparing and locking the unique identification code pre-stored in the wireless charging transmitter module and the wireless charging receiver module 11 respectively, the transmitter and the receiver are uniquely matched. Wireless charging transmitter module: converts the DC level into an AC power of a certain frequency through the bridge circuit 15 (full bridge or half bridge), and the frequency is two: a, the resonant frequency of the resonant capacitor a and the transmitting coil 16, and the resonant frequency of the resonant capacitor b and the transmitting coil 16. Wireless charging receiver module 11: receives energy and signals from the transmitting coil 16 through the receiving coil 17, converts the AC energy and signals into DC through the converter 14, and connects to the ground through the switch in front of the converter 14, so as to perform amplitude modulation on the signal.

[0016] The hands-off monitoring module 4 includes a plurality of capacitive sensors, a signal processing module and a data analysis and processing module. The plurality of capacitive sensors are installed on the handle of the power tool at intervals in an annular direction. The plurality of capacitive sensors are connected to the signal processing module. The signal processing module receives the signal from the capacitive sensor and performs preliminary processing to amplify the signal, filter out noise, and convert it into a format more suitable for analysis. The signal processing module outputs the processed signal to the data analysis and processing module. The signal processing module analyzes the characteristics of the processed signal, such as the amplitude, frequency and duration of the signal to distinguish whether the processed signal is caused by human hands or other interference (such as raindrops). Human hand contact usually produces a signal with a larger amplitude and a specific frequency range, while interference such as raindrops may produce a smaller, more random signal.

[0017] The output of the data analysis and processing module is connected to the first isolation drive circuit 5. The working principle of the capacitive sensor is common knowledge to those skilled in the art. A capacitor is formed between the capacitor plates and the air. The capacitance value of the capacitor mainly depends on the area of ​​the plates, the distance between the plates and the dielectric constant. Since the dielectric constant is different when there is a hand or not, the capacitance value is different, and the change of the capacitance value can be detected.

[0018] At least four capacitive sensors are provided. When 2 / 3 or more of the capacitive sensors detect a change in capacitance, the data analysis and processing module controls the output of a first start signal to the first isolation drive circuit 5. When the number of plate paths with a change in capacitance value is ≥ 2 / 3, it is considered that the hand is gripped. If it is less than 2 / 3, it is considered that the hand is off, making the detection more reliable.

[0019] It also includes a feedback isolation circuit 12 , through which the output end of the transformer 9 is connected to the control module 3 .

[0020] The energy path selection module 13 is also provided with an energy selection control chip, which selects whether to be powered by the rechargeable battery 1 or the wireless transmitting and receiving module according to a preset logic. The input end of the energy path selection module 13 is connected to the wireless transmitting and receiving module and the rechargeable battery 1, and the output end is connected to the internal power supply module 2. The circuit of the internal power supply module 2 is as follows: Figure 7 As shown, the energy path selection module 13 is connected to its VM+ pin.

[0021] The first isolation driving circuit 5 outputs a first state recovery signal, and the second isolation driving circuit 6 outputs a first state recovery signal; the first state recovery signal is used to drive the hand-off state display light or transmit back to the control module 3, and the second state recovery signal is used to drive the bracket state display light or transmit back to the control module 3. The first state recovery signal and the second state recovery signal can be pulse signals with the same frequency as the input signal, or can be inverted signals thereof.

[0022] This system can ensure that the power supply circuit of the power tool is not turned on when there is a circuit failure or abnormal state (no hand grip). The system always guides the power tool to the safe side during operation, avoiding safety hazards caused by factors such as heating or high-speed rotation of the power tool. The specific functions are as follows: 1. When the electric tool is placed in the bracket, the bracket monitoring module detects that the electric tool is placed in the bracket, the second isolation drive circuit 6 will not receive the second start signal, the second isolation drive circuit 6 has no output, the first isolation drive circuit 5, the second isolation drive circuit 6, and the third isolation drive circuit 7 connected in parallel in the safety module have no output, and the power switch 8 cannot be driven to output a pulse signal of a certain frequency, and the electric tool enters a shutdown or standby state; 2. When the electric tool is not placed in the bracket, but less than 2 / 3 of the capacitance sensors detect capacitance changes, the first isolation drive circuit 5 has no output and cannot drive the power switch 8 in the safety and module to output a pulse signal of a certain frequency, and the electric tool enters a shutdown or standby state; 3. It can ensure that when any sensor fails, it can also cut off the power supply of electrical equipment and stop the equipment to ensure safety.

[0023] The above description is only the preferred embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made by using the contents of the present invention specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A safety monitoring system for split-type electrical equipment, comprising a power module for power supply, a power tool and a bracket for placing the power tool, wherein the bracket is provided with a wireless charging transmitter module, and the wireless charging transmitter module is connected to the power module; the power tool is provided with a rechargeable battery and a wireless charging receiving module 11 connected to the rechargeable battery; the characteristics are: The rechargeable battery is connected to the power supply circuit of the power tool through the safety module, and the safety module includes: The bracket monitoring module, the wireless charging transmitting module and the wireless charging receiving module 11 are used as the bracket monitoring module to detect whether the electric tool is placed on the bracket; A hands-off monitoring module is used to detect whether the power tool is out of hand; A control module, wherein the control module is connected to a power switch via a first isolation drive circuit, a second isolation drive circuit, and a third isolation drive circuit arranged in series; The first isolation drive circuit input is connected to the hands-off monitoring module, and the second isolation drive circuit input is connected to the bracket monitoring module; An internal power supply module, the input of which is connected to a rechargeable battery, and the output of which is connected to the hands-off monitoring module, the control module, the first isolation drive circuit, the second isolation drive circuit, and the third isolation drive circuit; The transformer has an input connected to a rechargeable battery and a power switch, and an output connected to a power supply circuit of an electric tool.

2. The safety monitoring system for split-type electrical equipment according to claim 1 is characterized in that: The hands-off monitoring module includes a plurality of capacitive sensors, a signal processing module and a data analysis and processing module. The plurality of capacitive sensors are installed on the handle of the power tool at circumferential intervals. The plurality of capacitive sensors are connected to the signal processing module. The output of the signal processing module is connected to the data analysis and processing module. The output of the data analysis and processing module is connected to the first isolation drive circuit.

3. The safety monitoring system for split-type electrical equipment according to claim 2 is characterized in that: At least four capacitive sensors are provided, and when more than 2 / 3 of the capacitive sensors detect a capacitance change, the data analysis and processing module controls the output of a first start signal to the first isolation drive circuit.

4. The safety monitoring system for split-type electrical equipment according to claim 1 is characterized in that: It also includes a feedback isolation circuit, through which the output end of the transformer is connected to the control module.

5. The safety monitoring system for split-type electrical equipment according to claim 1 is characterized in that: The first isolation driving circuit outputs a first state recovery signal, and the second isolation driving circuit outputs a first state recovery signal; the first state recovery signal is used to drive the hand-off state display light or transmit back to the control module, and the second state recovery signal is used to drive the bracket state display light or transmit back to the control module.

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