Pressure-sensing electric mosquito swatter

Abstract

The present invention discloses a pressure-sensing electric mosquito swatter, which includes a power supply circuit, a discharge boost circuit, and an MCU central processing circuit. The power supply circuit provides the required power for the discharge boost circuit. A mesh surface W is provided on the discharge boost circuit. The MCU central processing circuit controls the voltage of the mesh surface W of the discharge boost circuit. Characteristically, it further includes a pressure sensing circuit. The pressure sensing circuit includes a piezoresistive sensor R7, a resistor R8, and a capacitor C2. The piezoresistive sensor R7 is disposed on the surface of the handle of the mosquito swatter. One end of the piezoresistive sensor R7 serves as the VCC terminal for power input, and the other end is connected to the resistor R8. The other end of the resistor R8 is grounded. One end of the capacitor C2 is grounded, and the other end is connected between the piezoresistive sensor R7 and the resistor R8 and is connected to the MCU central processing circuit together. This mosquito swatter has the advantages of being convenient and safe to use and having a good mosquito killing effect, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of electric mosquito rackets, and in particular to a pressure-sensing electric mosquito racket. Background Art

[0002] For existing electric mosquito rackets, their opening methods include ordinary button type and capacitive touch type. However, these two button methods still have the following deficiencies: (1) For ordinary buttons, there are phenomena such as poor contact and easy operation fatigue. For capacitive touch type, it is easy to randomly trigger the output of high voltage, posing a safety hazard to children, and it is also prone to interference and malfunction; (2) The boost mode is realized by using a transformer with three windings and a triode to form a self-excited oscillation circuit. This mode has high power consumption. When the mesh surface is short-circuited, the temperature rise of the device is extremely high, and the triode (above about 130 degrees) is easily damaged; (3) For traditional electric mosquito rackets, the power is not adjustable. It is okay for conventional mosquito killing, but it is powerless to kill flies or insects larger than mosquitoes. Summary of the Invention

[0003] The purpose of the present invention is to provide a pressure-sensing electric mosquito racket that is convenient and safe to use and has good mosquito killing effect.

[0004] The purpose of the present invention is achieved as follows:

[0005] A pressure-sensing electric mosquito racket includes a power supply circuit, a discharge boost circuit, and an MCU central processing circuit. The power supply circuit provides the required power for the discharge boost circuit. A mesh surface W is provided on the discharge boost circuit. The MCU central processing circuit controls the voltage of the mesh surface W of the discharge boost circuit. It is characterized in that it further includes a pressure sensing circuit. The pressure sensing circuit includes a piezoresistive sensor R7, a resistor R8, and a capacitor C2. The piezoresistive sensor R7 is arranged on the surface of the handle of the electric mosquito racket. One end of the piezoresistive sensor R7 serves as the VCC terminal for power input, and the other end is connected to the resistor R8. The other end of the resistor R8 is grounded. One end of the capacitor C2 is grounded, and the other end is connected between the piezoresistive sensor R7 and the resistor R8 and is connected to the MCU central processing circuit together. For this electric mosquito racket, when a person holds the handle of the electric mosquito racket, a corresponding pressure must be applied to the piezoresistive sensor R7 on the handle. The piezoresistive sensor R7 changes its resistance value according to the change of the pressure, and transmits the resistance value change signal to the MCU central processing circuit. The MCU central processing circuit performs arithmetic processing and outputs a signal to the discharge boost circuit to adjust (increase) the voltage of the mesh surface W to achieve mosquito killing. Its entire operation is simple. When using it, a certain pressure needs to be applied to the handle, otherwise it is not easy to turn on the mosquito killing function, avoiding the safety hazard of accidental operation when a child holds the electric mosquito racket. Therefore, the safety is greatly improved. Moreover, when hitting a mosquito, the user needs to keep applying a certain pressure to the handle to turn on the mosquito killing function. The grip on the handle is more stable, which is beneficial to improving the effect of hitting mosquitoes.

[0006] The object of the present invention can be further improved as follows:

[0007] Further, the discharge boost circuit includes a discharge circuit part and a boost circuit part. The discharge circuit part includes a capacitor C3, a diode D2, a resistor R9, a resistor R10, a resistor R11, a boost transformer T1, and a MOS transistor Q2. One end of the capacitor C3 serves as the VCC terminal of the power input, and the other end is connected to the diode D2. The two input ends of the boost transformer T1 are respectively connected to the other end of the diode D2 and the VCC terminal of the capacitor C3. The two ends of the resistor R9 are connected in parallel across the two ends of the capacitor C3. The source electrode of the MOS transistor Q2 is grounded, the drain electrode is connected to one end of the boost transformer T1 connected to the diode, and the gate electrode is connected to the resistor R10. The other end of the resistor R10 is connected to the MCU central processing circuit. The two ends of the resistor R11 are respectively connected to the MUC central processing circuit and the other end is grounded. The two output ends of the boost transformer T1 are connected to the boost circuit part. The mesh surface W is connected to the boost circuit part. The MCU central processing circuit, according to the resistance value change signal transmitted by the piezoresistive sensor R7, after arithmetic processing, outputs a PWM signal to the MOS transistor Q2. The MOS transistor Q2 drives the boost transformer T1 according to the duty cycle of the PMW. The voltage boosted by the boost transformer is boosted again by the boost circuit part and output to the mesh surface W.

[0008] Further, the MCU central processing circuit includes a chip IC, a resistor R5, a resistor R6, and a capacitor C1. The two ends of the capacitor C1 are respectively connected to the VDD terminal pin and the VSS terminal pin of the chip IC. The VSS terminal pin of the chip IC is grounded. One ends of the resistor R5 and the resistor R6 are respectively connected to the VDD terminal pin of the chip IC. The other end of the resistor R5 serves as the VCC terminal of the power input, and the other end of the resistor R6 is grounded. The PWM signal output terminal of the chip IC is connected to the resistor R10 and the resistor R11. The resistor value change signal input terminal of the chip IC is connected to the common connection end of the piezoresistive sensor R7, the resistor R8, and the capacitor C2 of the pressure sensing circuit, so that the piezoresistive sensor R7 transmits the resistor value change signal to the chip IC through the resistor value change signal input terminal, and the chip IC outputs a signal to the discharge boost circuit after arithmetic processing through the PWM signal output terminal.

[0009] The beneficial effects of the present invention are as follows:

[0010] (1)For this electric mosquito racket, when a person holds the handle of the electric mosquito racket, a corresponding pressure must be applied to the piezoresistive sensor R7 of the handle. According to the change of the pressure, the resistance value of the piezoresistive sensor R7 also changes accordingly, and the signal of the resistance value change is transmitted to the MCU central processing circuit. The MCU central processing circuit performs arithmetic processing and outputs a signal to the discharge booster circuit to adjust (increase) the voltage of the mesh W to achieve mosquito killing. The whole operation is simple. When using it, a certain pressure needs to be applied to the handle. Otherwise, it is not easy to start the mosquito killing function, avoiding the potential safety hazard of accidental operation when a child holds the electric mosquito racket. Therefore, the safety is greatly improved. Moreover, when swatting mosquitoes, the user needs to keep applying a certain pressure to the handle to turn on the mosquito killing function, and the grip on the handle is more stable, which is beneficial to improving the effect of swatting mosquitoes.

[0011] (2)Furthermore, the PWM drives the MOS tube Q2, and a double-winding transformer is used for boosting. This combination for boosting is also applied for the first time in the industry. Usually, the internal resistance of the MOS tube is small, and the switching loss is much smaller than that of the triode, so the temperature rise is small, effectively ensuring the service life of the components. The manufacturing process of the double-winding transformer is simple, and the insulation isolation between the primary and secondary windings is easy to achieve, making it more reliable in use.

[0012] (3)In addition, according to the different forces when a person holds the handle of the electric mosquito racket, the MCU automatically outputs the corresponding PWM through a special algorithm, enabling the MOS tube to turn on the corresponding power, making the mosquito killing more user-friendly. When the applied force is slightly greater, it can kill flies or insects larger than mosquitoes. Description of the Drawings

[0013] Figure 1 It is the circuit schematic diagram of the pressure-sensing electric mosquito racket of the present invention.

[0014] Figure 2 It is the partial sectional view of the electric mosquito racket of the present invention. Detailed Embodiments

[0015] The present invention will be further described below in conjunction with the drawings and embodiments:

[0016] See Figure 1 and Figure 2As shown in the figure, a pressure-sensing electric mosquito racket includes a power supply circuit 1, a discharge boost circuit 2, and an MCU central processing circuit 3. The power supply circuit 1 can be a charging circuit to provide the required power for the discharge boost circuit 2. A mesh surface W is provided on the discharge boost circuit 2. The MCU central processing circuit 3 controls the voltage of the mesh surface W of the discharge boost circuit. It is characterized in that it further includes a pressure sensing circuit 4. The pressure sensing circuit 4 includes a piezoresistive sensor R7, a resistor R8, and a capacitor C2. The piezoresistive sensor R7 is arranged on the surface of the handle 6 of the electric mosquito racket. One end of the piezoresistive sensor R7 serves as the VCC terminal for power input, and the other end is connected to the resistor R8. The other end of the resistor R8 is grounded. One end of the capacitor C2 is grounded, and the other end is connected between the piezoresistive sensor R7 and the resistor R8 and is connected to the MCU central processing circuit together. When the piezoresistive sensor R7 senses a pressure change, its resistance value also changes accordingly, and the resistance value change signal is transmitted to the MCU central processing circuit. After being processed by arithmetic operations by the MCU central processing circuit, a signal is output to the discharge boost circuit to adjust the voltage of the mesh surface W.

[0017] As shown in the figure, the discharge boost circuit 2 includes a discharge circuit part and a boost circuit part. The discharge circuit part includes a capacitor C3, a diode D2, a resistor R9, a resistor R10, a resistor R11, a boost transformer T1, and a MOS transistor Q2. One end of the capacitor C3 serves as the VCC terminal for power input, and the other end is connected to the diode D2. The two input ends of the boost transformer T1 are respectively connected to the other end of the diode D2 and the VCC terminal of the capacitor C3. The two ends of the resistor R9 are connected in parallel across the two ends of the capacitor C3. The source electrode of the MOS transistor Q2 is grounded, the drain electrode is connected to one end of the boost transformer T1 connected to the diode, and the gate electrode is connected to the resistor R10. The other end of the resistor R10 is connected to the MCU central processing circuit. The two ends of the resistor R11 are respectively connected to the MUC central processing circuit, and the other end is grounded. The two output ends of the boost transformer T1 are connected to the boost circuit part. The mesh surface W is connected to the boost circuit part. The MCU central processing circuit, according to the resistance value change signal transmitted by the piezoresistive sensor R7, after being processed by arithmetic operations, outputs a PWM signal to the MOS transistor Q2. The MOS transistor Q2 drives the boost transformer T1 according to the duty cycle of the PMW. The voltage boosted by the boost transformer is boosted again by the boost circuit part and output to the mesh surface.

[0018] In this embodiment, the MCU central processing circuit 3 includes a chip IC, a resistor R5, and a resistor R6. Both ends of the capacitor C1 are respectively connected to the VDD pin and the VSS pin of the chip IC. The VSS pin of the chip IC is grounded. One ends of the resistor R5 and the resistor R6 are respectively connected to the VDD pin of the chip IC. The other end of the resistor R5 serves as the VCC terminal for power input, and the other end of the resistor R6 is grounded. The PWM signal output terminal of the chip IC is connected to the resistor R10 and the resistor R11. The resistor value change signal input terminal of the chip IC is connected to the common connection end of the piezoresistive sensor R7, the resistor R8, and the capacitor C2 of the pressure sensing circuit 4, so that the piezoresistive sensor R7 transmits the resistor value change signal to the chip IC through the resistor signal change input terminal, and the chip IC outputs a signal to the discharge boost circuit through the PWM signal output terminal after arithmetic processing.

[0019] Currently, for popular rechargeable lithium battery mosquito rackets, many in the industry do not have a lithium battery protection function. This circuit adds overcharge, over-discharge, and short-circuit protection functions. In this embodiment, as shown in the figure, the power supply circuit 1 includes a diode D1, resistors R1 - R4, a MOS transistor Q1, and a battery M, etc. Among them, the resistor R1 and the resistor R2 are connected in series as a group, and the resistor R3 and the resistor R4 are connected in series as another group. Among them, the other end of the resistor R2 is grounded, the other end of the resistor R4 is connected to the chip IC, both ends of the diode D1 are respectively connected to the resistor R1 and the resistor R3, the gate of the MOS transistor Q1 is connected between the resistor R3 and the resistor R4, its source and drain are respectively connected to the battery M and the other end of the resistor R3, and the other end of the battery M is grounded; in addition, as shown in the figure, there is also a USB interface, both ends of the USB are respectively connected to the resistor R1 and the resistor R2, and the anode of the battery is also connected to the VCC terminal for power input. When working, when the voltage of the battery M of the mosquito racket is lower than 4V, the MCU outputs a PWM signal to drive the MOS transistor Q1, and the current of the USB charger charges the battery M through the diode D1 and the MOS transistor Q1. When it is charged to 4.2V, the MOS transistor Q1 is turned off to stop charging the battery, realizing the overcharge function.

[0020] In the discharge boost circuit of this embodiment, when the force applied to the handle 6 of the mosquito racket reaches the corresponding value, the chip IC outputs a PWM signal to drive the MOS transistor Q2 to turn on the power boost and discharge. When the battery discharges to 2.8V, the MOS transistor Q2 is turned off to disconnect the power supply of the boost circuit to realize the over-discharge function. In addition, a short-circuit protector FS is connected in series between the positive terminal of the battery M of the power supply circuit and the power input VCC terminal; so that the short-circuit protector FS instantaneously disconnects the power supply when discharging or short-circuiting due to other reasons.

[0021] The diodes D3 - D5 and the capacitors C4 - C6 form a three-stage voltage multiplier circuit, and the voltage output by the transformer T1 is boosted again by the three-stage voltage multiplier, so as to achieve the purpose of electrocuting mosquitoes, flies, or other insects.

[0022] Working principle: When a person holds the handle 6 of the electric mosquito swatter, it is necessary to apply corresponding pressure to the piezoresistive sensor R7 on the handle 6 at the same time. According to the change of pressure, the resistance value of the piezoresistive sensor R7 also changes, and the resistance value change signal is transmitted to the MCU central processing circuit 3. The chip IC of the MCU central processing circuit 3 performs arithmetic processing and outputs a PMW signal from the PWM signal output terminal to the discharge boost circuit 2, that is: output a PWM signal to the MOS transistor Q2. The MOS transistor Q2 drives the boost transformer T1 according to the duty cycle of the PMW. The voltage boosted by the boost transformer T1 is boosted again by the boost circuit part and output to the mesh surface W to adjust (increase) the voltage of the mesh surface W to achieve mosquito killing.

Claims

1. Pressure-sensing electric mosquito swatter, comprising a power supply circuit (1), a discharge boost circuit (2) and an MCU central processing circuit (3). The power supply circuit (1) provides the required power supply for the discharge boost circuit (2). A mesh surface W is provided on the discharge boost circuit (2). The MCU central processing circuit (3) controls the voltage of the mesh surface W of the discharge boost circuit. It is characterized in that, It further includes a pressure sensing circuit (4), and the pressure sensing circuit (4) includes a piezoresistive sensor R7, a resistor R8, and a capacitor C2. The piezoresistive sensor R7 is disposed on the surface of the handle (6) of the electric mosquito swatter. One end of the piezoresistive sensor R7 serves as the VCC terminal for power input, and the other end is connected to the resistor R8. The other end of the resistor R8 is grounded. One end of the capacitor C2 is grounded, and the other end is connected between the piezoresistive sensor R7 and the resistor R8 and is connected to the MCU central processing circuit together. When the piezoresistive sensor R7 senses a pressure change, its resistance value also changes, and the resistance value change signal is transmitted to the MCU central processing circuit. After being processed by arithmetic operations in the MCU central processing circuit (3), a signal is output to the discharge boost circuit (2) to adjust the voltage of the mesh W. The discharge boost circuit (2) includes a discharge circuit part (21) and a boost circuit part (22). The discharge circuit part (21) includes a capacitor C3, a diode D2, a resistor R9, a resistor R10, a resistor R11, a boost transformer T1, and a MOS transistor Q2. One end of the capacitor C3 serves as the VCC terminal for power input, and the other end is connected to the diode D2. The two input ends of the boost transformer T1 are respectively connected to the other end of the diode D2 and the VCC terminal of the capacitor C3. The two ends of the resistor R9 are connected in parallel across the two ends of the capacitor C3. The source electrode of the MOS transistor Q2 is grounded, the drain electrode is connected to one end of the boost transformer T1 connected to the diode, and the gate electrode is connected to the resistor R10. The other end of the resistor R10 is connected to the MCU central processing circuit (3). The two ends of the resistor R11 are respectively connected to the MUC central processing circuit (3), and the other end is grounded. The two output ends of the boost transformer T1 are connected to the boost circuit part (22). The mesh W is connected to the boost circuit part (22). According to the resistance value change signal transmitted by the piezoresistive sensor R7, the MCU central processing circuit (3) outputs a PWM signal to the MOS transistor Q2 after being processed by arithmetic operations. The MOS transistor Q2 drives the boost transformer T1 according to the duty cycle of the PMW. The voltage boosted by the boost transformer is boosted again by the boost circuit part (22) and output to the mesh W. The power supply circuit (1) includes a battery M. A short-circuit protector FS is connected in series between the positive electrode end of the battery M and the power input VCC terminal. The other end of the battery M is grounded.

2. The pressure-sensing electric mosquito racket according to claim 1, wherein, The MCU central processing circuit (3) includes a chip IC, a resistor R5, a resistor R6, and a capacitor C1. Two ends of the capacitor C1 are respectively connected to the VDD pin and the VSS pin of the chip IC. The VSS pin of the chip IC is grounded. One ends of the resistor R5 and the resistor R6 are respectively connected to the VDD pin of the chip IC. The other end of the resistor R5 serves as the VCC terminal for power input, and the other end of the resistor R6 is grounded. The PWM signal output terminal of the chip IC is connected to a resistor R10 and a resistor R11. The input terminal for the resistor value change signal of the chip IC is connected to the common connection terminal of a piezoresistive sensor R7, a resistor R8, and a capacitor C2 in the pressure sensing circuit (4), so that the piezoresistive sensor R7 transmits the resistor value change signal to the chip IC through the input terminal for the resistor value change signal. After being processed by the chip IC through calculation, a signal is output from the PWM signal output terminal to the discharge and boost circuit.

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