Self-excited oscillation circuit with double output voltages, electronic mosquito swatter circuit and electronic mosquito swatter thereof

Abstract

The utility model discloses a self-oscillation circuit with double output voltages, an electric mosquito swatter circuit and an electric mosquito swatter thereof. The self-oscillation circuit comprises a switch (S9), the switch (S9) is provided with a first wire and a second wire, and a front end contact of the first wire is connected to a base electrode of a triode (Q3) through a feedback winding of a boosting transformer (T3). A front end contact of the second wire passes through a collector electrode of a triode (Q3), and an emitter electrode of the triode (Q3) is grounded through a primary winding of a boosting transformer (T3). A first capacitor (C14) and a second capacitor (C17) which are connected in parallel are arranged between the first wire and the base electrode of the triode (Q3), and a rear end contact of the second wire is grounded through a first diode (D21) and a second diode (D24) which are connected in parallel. The mosquito and fly killing efficiency is improved through the high-voltage potential in the daytime, and the mosquito and fly killing sound is reduced by adjusting the high-voltage potential to the low-voltage potential at night.

Description

Technical Field

[0001] The utility model relates to an electric mosquito swatter, in particular to a self-excited oscillation circuit with dual output voltages, an electric mosquito swatter circuit and the electric mosquito swatter. Background Art

[0002] The electric mosquito swatter is a small household appliance that has gradually become an indispensable household tool for killing mosquitoes in summer. The existing electric mosquito swatter circuit generally includes: charging indication circuit, charging circuit, lighting circuit, mosquito attracting lamp circuit, self-excited oscillation circuit and frequency multiplication rectification circuit (boosting circuit). Among them, the self-excited oscillation circuit is as follows: Figure 2 As shown, Figure 2 The connection relationship between the self-excited oscillation circuit and the frequency doubling rectifier circuit of the existing electric mosquito swatter is shown, including a self-excited oscillation circuit composed of a first transistor Q1 and a first step-up transformer T1, and a voltage doubling rectifier circuit composed of a first diode D1, a second diode D2, a third diode D3, a first capacitor C1, a second capacitor C2, and a third capacitor C3; when the boost circuit is connected to the first power supply, the self-excited oscillation circuit works, and the low-voltage direct current provided by the first power supply is inverted into high-frequency alternating current, and is input into the voltage doubling rectifier circuit through the secondary winding N3 of the first step-up transformer T1 to obtain high-voltage direct current provided to the mosquito net. The problem with the prior art is that the voltage output by the self-excited oscillation circuit to the frequency doubling rectifier circuit (boost circuit) is a fixed value. In order to improve the killing efficiency of mosquitoes and flies, its killing voltage value is generally relatively high. Generally speaking, the electric mosquito swatter will have three layers of metal mesh, of which the two outer layers of sparse metal mesh are of the same polarity, and the middle layer is of the other polarity. When the mosquito is between the inner and outer metal meshes, the current flows through the body of the mosquito, connecting the inner and outer metal meshes, and electrocuting the mosquito to death. The voltage of the electric mosquito swatter is thousands of volts (generally the voltage between the two poles is 3 kilovolts). When the mosquito enters between the two layers of the mesh, the mosquito's body is very conductive, which is equivalent to the air layer between the two electrodes becoming thinner. When it becomes thin to a certain extent, the voltage breaks through the air, forming an arc discharge. The electric mosquito swatter discharges through the path of "external mesh-mosquito body-ionized air-inner mesh". The discharge produces crackling sounds and sparks. At night, when mosquitoes or flying insects are attracted by mosquito traps and electrocuted, the crackling discharge sound will affect the sleep of people around the electric mosquito swatter.

[0003] A Chinese invention patent (application number CN201210340967.5, application date 2012.09.16, publication number CN103684261A) discloses a self-excited oscillation circuit, which includes a balanced bridge circuit and a commutation circuit; the balanced bridge circuit includes: the collector of the first transistor is electrically connected to the collector of the second transistor, and the source is electrically connected to the collector of the third transistor; the source of the third transistor is grounded; the collector of the fourth transistor is electrically connected to the source of the second transistor, and the source is grounded; the power input winding is bridged between the source of the first transistor and the source of the second transistor; the commutation circuit includes a second winding, a third winding, a fourth winding and a fifth winding respectively coupled to the first winding; the two ends of the second winding, the third winding, the fourth winding and the fifth winding are respectively electrically connected to the base and source of the second transistor, the first transistor, the fourth transistor and the third transistor. This invention patent application outputs voltage by coupling one winding with four windings, and its output has only one voltage value. It is impossible to achieve conversion of two or two groups of output voltage values ​​through switch switching to adapt to the output voltage requirements of different application scenarios.

[0004] Therefore, there is a need in the market for an electric mosquito swatter that can be used both during the day and at night, and whose electric shock sound when used at night is smaller than that during the day. Utility Model Content

[0005] The utility model aims to disclose a self-excited oscillation circuit with dual output voltages.

[0006] Another purpose of the utility model is to disclose an electric mosquito swatter circuit with dual output voltages.

[0007] Another object of the utility model is to disclose an electric mosquito swatter with dual output voltages.

[0008] The purpose of the utility model is to implement in the following manner: a self-excited oscillation circuit with dual output voltages, comprising: a circuit composed of a transistor (Q3), a first resistor (R21), a second resistor (R22), a third resistor (R25) and a step-up transformer (T3), characterized in that: the self-excited oscillation circuit also includes a switch (S9), a first capacitor (C14), a second capacitor (C17), a first diode (D21), and a second diode (D24); wherein the switch (S9) is provided with a first wire and a second wire, the front end contact of the first wire is connected to the base of the transistor (Q3) through a feedback winding of a step-up transformer (T3); the front end contact of the second wire passes through the collector of the transistor (Q3), and the emitter of the transistor (Q3) is grounded through a primary winding of the step-up transformer (T3). A first capacitor (C14) and a second capacitor (C17) are connected in parallel between the first conductor and the base of the transistor (Q3). With the switching action of the switch (S9), the rear contact of the first conductor is alternately connected to and disconnected from the first capacitor (C14) and the second capacitor (C17); the rear end contact of the second conductor is grounded through a first diode (D21) and a second diode (D24) connected in parallel. With the switching action of the switch (S9), the rear contact of the second conductor is alternately connected to and disconnected from the first diode (D21) and the second diode (D24).

[0009] Preferably, the front end contact of the first wire is connected to the base of the transistor (Q3) through the feedback winding of the step-up transformer (T3), and a third resistor (R25) is connected in series in front of the base of the transistor (Q3); the rear end contact of the second wire is grounded through a first diode (D21) and a second diode (D24) connected in parallel, and the first resistor (R21) is connected in series before grounding.

[0010] Preferably, the front end contact of the second wire of the switch (S9) is connected to the base of the transistor (Q3) through the third resistor (R22).

[0011] Preferably, the capacitance value of the first capacitor (C14) is 1nf, and the capacitance value of the first capacitor (C14) is 100nf.

[0012] Preferably, the resistance value of the first resistor (R21) is 1K; the resistance value of the second resistor (R25) is 22K; and the resistance value of the third resistor (R22) is 10K.

[0013] Another object of the utility model is to implement in the following manner: an electric mosquito swatter circuit with dual output voltages, comprising: a charging indication circuit (M1), a charging circuit (M2), a lighting circuit (M3), a mosquito attracting lamp circuit (M4) and a frequency doubling rectifier circuit (M6), characterized in that it also includes the self-excited oscillation circuit (M5), and the self-excited oscillation circuit (M5) is coupled to the frequency doubling rectifier circuit (M6) through a step-up transformer (T3).

[0014] Another object of the present utility model is to implement in the following manner: an electric mosquito swatter with dual output voltages, mainly comprising a grid, a handle, and an electric mosquito swatter circuit, characterized in that the electric mosquito swatter circuit is an electric mosquito swatter circuit with dual output voltages.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model sets a switch (S9) in the self-excited oscillation circuit (M5), adjusts the voltage of the base and collector of the triode (Q3) by switching the position of the switch (S9), and controls the output voltage of the frequency-doubling rectifier circuit (M6) by the step-up transformer (T3), thereby presenting two voltage states on the electric mosquito swatter power grid, namely: adjusting to a high voltage potential during the day to improve the killing efficiency of mosquitoes and flies, and adjusting to a low voltage potential at night to reduce the sound of killing mosquitoes and flies. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The circuit diagram of the utility model,

[0017] Figure 1 a is an enlarged view of the self-excited oscillation circuit (M5) module of the utility model,

[0018] Figure 2 This is a self-excited oscillation circuit diagram of the prior art. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0020] The purpose of the utility model is to implement in the following manner, a self-excited oscillation circuit with dual output voltages, comprising: a circuit consisting of a transistor Q3, a first resistor R21, a second resistor R22 and a third resistor R25 and a step-up transformer T3, characterized in that: the self-excited oscillation circuit also includes a switch S9, a first capacitor C14, a second capacitor C17, a first diode D21, and a second diode D24; wherein the switch S9 is provided with a first wire and a second wire, the front end contact of the first wire is connected to the base of the transistor Q3 through the feedback winding of the step-up transformer T3; the front end contact of the second wire passes through the collector of the transistor Q3, and the emitter of the transistor Q3 is grounded through the primary winding of the step-up transformer T3. A first capacitor C14 and a second capacitor C17 are connected in parallel between the first conductor and the base of the transistor Q3. With the switching action of the switch S9, the rear contact of the first conductor is alternately connected to and disconnected from the first capacitor C14 and the second capacitor C17. The rear end contact of the second conductor is grounded through a first diode D21 and a second diode D24 connected in parallel. With the switching action of the switch S9, the rear contact of the second conductor is alternately connected to and disconnected from the first diode D21 and the second diode D24.

[0021] Preferably, the front end contact of the first wire is connected to the base of the transistor Q3 through the feedback winding of the step-up transformer T3, and a third resistor R25 is connected in series in front of the base of the transistor Q3; the rear end contact of the second wire is grounded through the first diode D21 and the second diode D24 connected in parallel, and the first resistor R21 is connected in series before grounding.

[0022] Preferably, the front end contact of the second wire of the switch S9 is connected to the base of the transistor Q3 through the third resistor R22.

[0023] Preferably, the capacitance value of the first capacitor C14 is 1 nf, and the capacitance value of the first capacitor C14 is 100 nf.

[0024] Preferably, the resistance value of the first resistor R21 is 1K; the resistance value of the second resistor R25 is 22K; and the resistance value of the third resistor R22 is 10K.

[0025] Another object of the utility model is to implement in the following manner: an electric mosquito swatter circuit with dual output voltages, comprising: a charging indication circuit M1, a charging circuit M2, a lighting circuit M3, a mosquito attractant circuit M4 and a frequency doubling rectifier circuit M6, characterized in that it also includes the self-excited oscillation circuit M5, and the self-excited oscillation circuit M5 is coupled to the frequency doubling rectifier circuit M6 through a step-up transformer T3.

[0026] Another object of the present utility model is to implement in the following manner: an electric mosquito swatter with dual output voltages, mainly comprising a grid, a handle, and an electric mosquito swatter circuit, characterized in that the electric mosquito swatter circuit is an electric mosquito swatter circuit with dual output voltages.

[0027] Charging indicator circuit. It consists of a current limiting resistor and an LED indicator light. When charging is connected to a power source through the USB port, the LED indicator light will light up.

[0028] Lead-acid battery charging circuit. When the 5V power supply is connected through the USB port, the voltage is stepped down by the diode and then charged to the battery.

[0029] Lighting circuit. The battery voltage passes through the toggle switch, then through the touch switch, current limiting resistor, and then through the socket to the LED lighting. Press the touch switch and the lighting will light up.

[0030] Mosquito trap lamp circuit. The USB power goes through the toggle switch, current limiting resistor, and the socket to the mosquito trap lamp. When the USB power is connected and the toggle switch is turned to the second gear, the mosquito trap lamp will light up.

[0031] Self-excited oscillation circuit. Through the transistor's own oscillation, direct current is converted into alternating current. Power supply 1 is connected to the base of the transistor through the transformer feedback winding. 1 passes through the transistor collector, and the emitter is grounded through the transformer primary winding. When the current passes through the feedback winding, the feedback winding is equivalent to an inductor, which hinders the increase of current, so the base current of the transistor will gradually increase. The transistor CE slowly begins to conduct. The voltage of the primary winding of the transformer gradually increases. When the transistor is fully turned on, the current no longer changes. The transformer induced electromotive force begins to disappear, the current passing through the feedback winding begins to decrease, the base current of the transistor decreases, and the transistor begins to shut down. The transistor is continuously turned on and off, and then amplified by the transformer to form several hundred volts of alternating current. The circuit is switched by the dip switch to change the size of the base capacitor connected to the transistor, thereby changing the switching frequency and base current of the transistor, so as to change the output voltage. In this way, when it is relatively quiet at night, a lower voltage is output, so that mosquitoes can be killed without making a loud noise and affecting others' sleep.

[0032] Frequency doubling rectifier circuit. The circuit rectifies and amplifies the voltage output by the secondary coil of the transformer through diode rectification and controls the charging direction of the capacitor, thereby outputting 4 times the high-voltage direct current output by the secondary coil to the mosquito swatter power grid.

[0033] In another embodiment, more than two capacitors in parallel may be connected to the first wire at the rear end of the switch S9, and more than two diodes in parallel may be connected to the second wire, thereby achieving the output of more than two electric shock voltages.

[0034] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A self-excited oscillation circuit with dual output voltages, comprising: A circuit consisting of a transistor (Q3), a first resistor (R21), a second resistor (R22), a third resistor (R25) and a step-up transformer (T3), characterized in that: The self-excited oscillation circuit also includes a switch (S9), a first capacitor (C14), a second capacitor (C17), a first diode (D21), and a second diode (D24); wherein the switch (S9) is provided with a first wire and a second wire, the front end contact of the first wire is connected to the base of the transistor (Q3) through the feedback winding of the step-up transformer (T3); the front end contact of the second wire passes through the collector of the transistor (Q3), and the emitter of the transistor (Q3) is grounded through the primary winding of the step-up transformer (T3); A first capacitor (C14) and a second capacitor (C17) are connected in parallel between the first conductor and the base of the transistor (Q3). With the switching action of the switch (S9), the rear contact of the first conductor is alternately connected to and disconnected from the first capacitor (C14) and the second capacitor (C17); the rear end contact of the second conductor is grounded through a first diode (D21) and a second diode (D24) connected in parallel. With the switching action of the switch (S9), the rear contact of the second conductor is alternately connected to and disconnected from the first diode (D21) and the second diode (D24).

2. The self-excited oscillation circuit with dual output voltages according to claim 1, characterized in that: The front end contact of the first wire is connected to the base of the transistor (Q3) through the feedback winding of the step-up transformer (T3), and a third resistor (R25) is connected in series in front of the base of the transistor (Q3); the rear end contact of the second wire is grounded through a first diode (D21) and a second diode (D24) connected in parallel, and the first resistor (R21) is connected in series before grounding.

3. The self-excited oscillation circuit with dual output voltages according to claim 1, characterized in that: The front end contact of the second conducting wire of the switch (S9) is connected to the base of the transistor (Q3) through the third resistor (R22).

4. The self-excited oscillation circuit with dual output voltages according to claim 1, characterized in that: The capacitance value of the first capacitor (C14) is 1nf, and the capacitance value of the first capacitor (C14) is 100nf.

5. The self-excited oscillation circuit with dual output voltages according to claim 1, characterized in that: The resistance value of the first resistor (R21) is 1K; the resistance value of the second resistor (R25) is 22K; and the resistance value of the third resistor (R22) is 10K.

6. An electric mosquito swatter circuit with dual output voltages, comprising: A charging indication circuit (M1), a charging circuit (M2), a lighting circuit (M3), a mosquito trap circuit (M4) and a frequency doubling rectifier circuit (M6), characterized in that it also includes a self-excited oscillation circuit (M5) according to any one of claims 1 to 5, and the self-excited oscillation circuit (M5) is coupled to the frequency doubling rectifier circuit (M6) through a step-up transformer (T3).

7. An electric mosquito swatter with dual output voltages, mainly comprising a grid, a handle, and an electric mosquito swatter circuit, characterized in that: The electric mosquito swatter circuit is the electric mosquito swatter circuit with dual output voltages according to claim 6.

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