CN212304836U

CN212304836U - Power supply voltage stabilizing circuit of electrostatic sprayer

Info

Publication number: CN212304836U
Application number: CN202021461212.7U
Authority: CN
Inventors: 李金钟
Original assignee: Qingdao Chanshan Environmental Protection Technology Co ltd
Current assignee: Qingdao Chanshan Environmental Protection Technology Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-01-05
Anticipated expiration: 2030-07-22

Abstract

The utility model provides an electrostatic spray ware power voltage stabilizing circuit belongs to electrostatic spray equipment technical field. The power supply voltage stabilizing circuit comprises a transient suppressor T1, a frequency setting resistor R4, a voltage divider circuit, a voltage reduction conversion chip N1, a compensation circuit and an enabling control circuit, wherein the voltage stabilizing circuit is added to the existing electrostatic sprayer equipment, and voltage can be stabilized when the voltage of a battery is unstable, so that the voltage output to a boosting device is always kept stable, and the problems that the voltage inside the battery of the existing electrostatic sprayer equipment is unstable, the final output voltage of the boosting device is lower than or higher than the set output voltage, the electrification capacity of fog drops is reduced, the adsorption capacity of sprayed objects is weakened, the pollution to the environment and the waste of resources caused by the fact that the pesticide fog drops which are not adsorbed by the sprayed objects are scattered to the ground, and the spraying effect is not ideal are solved.

Description

Power supply voltage stabilizing circuit of electrostatic sprayer

Technical Field

The utility model relates to an electrostatic spraying equipment technical field particularly, relates to an electrostatic spraying ware power voltage stabilizing circuit.

Background

The electrostatic spraying technology is that high voltage static electricity is applied to establish an electrostatic field between a spray head and a spraying target, pesticide fluid is charged by different charging methods after being atomized by the spray head to form charged fog drops, then the fog drops move directionally and are adsorbed at each part of the target under the combined action of electrostatic field force and other external forces, so that good performances such as high deposition efficiency, less fog drop drift loss, ecological environment improvement and the like are achieved, at present, battery-powered electrostatic sprayer equipment is provided, the battery-powered electrostatic sprayer equipment can spray more conveniently, an internal circuit is generally composed of a battery and a boosting device, but due to the characteristics of the battery, the internal voltage of the battery changes in real time, the internal voltage of the battery is higher when the battery starts to work, the voltage is slowly reduced after the battery works for a period of time, so that the final output voltage of the boosting device is lower than or higher than the set output voltage, therefore, the electrification capacity of the fog drops is reduced, the adsorption capacity of the fog drops and the sprayed object is weakened, the pesticide fog drops which are not adsorbed by the sprayed object are scattered to the ground, the environment is polluted, resources are wasted, and the spraying effect is not ideal.

SUMMERY OF THE UTILITY MODEL

In order to compensate above not enough, the utility model provides an electrostatic spray power voltage stabilizing circuit, through increasing voltage stabilizing circuit to current electrostatic spray equipment, can carry out steady voltage processing with the voltage when battery voltage is unstable, voltage with guaranteeing to export booster unit remains stable all the time, the voltage instability of the inside of the battery that has solved present electrostatic spray equipment existence, the voltage that leads to the final output of booster unit is less than or is higher than the output voltage of setting for, thereby make the electrified ability decline of fog drop, weaken with the adsorption energy who is sprayed the object, the pesticide fog drop that does not spray the object absorption with being scattered ground and cause the pollution and the extravagant resource of environment, spray unsatisfactory problem of effect.

The utility model discloses a realize like this:

a power supply voltage stabilizing circuit of an electrostatic atomizer comprises a transient suppressor T1, a frequency setting resistor R4, a voltage dividing circuit, a voltage reduction conversion chip N1, a compensating circuit and an enabling control circuit; the transient suppressor T1 is electrically connected to an output terminal of a power supply, the buck conversion chip N1 is electrically connected to the transient suppressor, the frequency setting resistor R4, the voltage dividing circuit, the compensating circuit and the enable control circuit, respectively, and the transient suppressor T1 is electrically connected to the enable control circuit;

the power supply input V + end is electrically connected with the transient suppressor T1, the capacitor C2, the resistor R1 and one end of a 7-pin VIN of the buck conversion chip N1, the other ends of the transient suppressor T1 and the capacitor C2 are electrically connected with GND, the other end of the resistor R1 is electrically connected with a 2-pin EN of the buck conversion chip N1 and one end of the resistor R5, and the other end of the resistor R5 is electrically connected with GND; one end of the resistor R4 is electrically connected with a 6 pin FREQ of the buck conversion chip N1, and the other end of the resistor R4 is electrically connected with GND; a 5 pin GND of the buck conversion chip N1 is electrically connected with GND, an 8 pin BST of the buck conversion chip N1 is electrically connected with one end of a capacitor C1, the other end of the capacitor C1 is electrically connected with a 1 pin SW of the buck conversion chip N1, one end of a diode D1 and one end of an energy storage inductor L1, and the other end of a diode D1 is electrically connected with GND;

a pin 3 COMP of the buck conversion chip N1 is electrically connected with one end of a capacitor C4, the other end of the capacitor C4 is electrically connected with one end of a resistor R6, and the other end of the resistor R6 is electrically connected with GND;

the 4 pin FB of the buck conversion chip N1 is electrically connected with one ends of the resistor R3 and the resistor R7, the other end of the resistor R7 is electrically connected with GND, and the other end of the resistor R3 is electrically connected with one end of the resistor R2;

the load terminal V _12 is electrically connected to the other terminal of the inductor L1, the other terminal of the resistor R2, and one terminal of the capacitor C3, and the other terminal of the capacitor C3 is electrically connected to GND.

In an embodiment of the present invention, the transient suppressor T1 is a transient suppressor diode for preventing the step-down converter N1 from being damaged by the over-high voltage at the power-on instant.

In an embodiment of the present invention, the voltage dividing circuit includes a resistor R2, a resistor R3, and a resistor R7, and the resistor R2, the resistor R3, and the resistor R7 are connected in series to feed back the output voltage to the buck conversion chip N1 and compare with the internal reference value, so that the output voltage meets the set output requirement.

In an embodiment of the present invention, the compensation circuit includes a capacitor C4 and a resistor R6, and the capacitor C4 is connected in series with the resistor R6 for compensating the frequency of the control loop.

In an embodiment of the present invention, the enable control circuit includes a resistor R1 and a resistor R5, and is used for controlling the buck conversion chip N1 to be turned on and off.

In an embodiment of the present invention, the buck conversion chip N1 is an IC with a wide input range.

In an embodiment of the present invention, the resistor R4 is used to set the programming of the switching frequency of the buck converter chip N1, and set the switching frequency.

In an embodiment of the present invention, the capacitor C2 and the capacitor C3 are ceramic capacitors.

The utility model has the advantages that: the utility model discloses an electrostatic atomizer power voltage regulator circuit that obtains through above-mentioned design, when output voltage becomes high, the voltage after the voltage divider circuit partial pressure that the voltage constitutes through resistance R2, resistance R3 and resistance R7 also follows to rise, feed back to the FB end of step-down conversion chip N1, after internal error amplifier and internal reference voltage compare, control inside MOSFET pipe, make output voltage reduce until output voltage reaches stable output voltage, when output voltage becomes low, the voltage after voltage divider through resistance R2, resistance R3 and resistance R7 also follows to become low, feed back to the FB end, after internal error amplifier and internal reference voltage compare, control inside MOSFET pipe, make output voltage rise until reaching stable voltage output state, in order to guarantee to export the voltage of booster unit to remain stable all the time, thereby make fog droplet electrification ability remain stable, the problems that the voltage inside a battery of the existing electrostatic sprayer equipment is unstable, the voltage finally output by a boosting device is lower than or higher than the set output voltage, the electrification capacity of fog drops is reduced, the adsorption capacity of sprayed objects is weakened, pesticide fog drops which are not adsorbed by the sprayed objects float to the ground, the environment is polluted, resources are wasted, and the spraying effect is not ideal are solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a diagram of a voltage stabilizing circuit of an electrostatic atomizer power supply according to an embodiment of the invention.

In the figure: 1-transient suppressor T1; 2-frequency setting resistor R4; 3-a voltage divider circuit; 4-buck converter chip N1; 5-a compensation circuit; 6-enable control circuit.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

Referring to fig. 1, the present invention provides a technical solution: a voltage stabilizing circuit for a power supply of an electrostatic atomizer comprises a transient suppressor T11, a frequency setting resistor R42, a voltage dividing circuit 3, a buck conversion chip N14, a compensation circuit 5 and an enabling control circuit 6, wherein the transient suppressor T11 is a transient suppressor diode, when an input voltage is too high (higher than a protection voltage of the transient suppressor T11), the transient suppressor is conducted to pull down the power supply voltage to prevent the buck conversion chip N14 from being damaged due to the too high voltage at the moment of power-on, the transient suppressor T11 is electrically connected with an output end of the power supply, the model of the buck conversion chip N14 is limited to be MP4462DN in the embodiment, the buck conversion chip N14 is an IC with a wide input range, the buck conversion chip is a high-frequency buck switching regulator which has an integrated high-end high-voltage power MOSFET, the switching frequency is reduced in a wide high-power conversion efficiency load range to realize that the switching frequency is under a light load condition, in order to reduce switching and gate driving losses, the buck conversion chip N14 is electrically connected to the transient suppressor, the frequency setting resistor R42, the voltage divider circuit 3, the compensation circuit 5, and the enable control circuit 6, the transient suppressor T11 is electrically connected to the enable control circuit 6, a power input V + terminal is electrically connected to one end of the transient suppressor T11, the capacitor C2, the resistor R1, and the 7-pin VIN of the buck conversion chip N14, the other ends of the transient suppressor T11 and the capacitor C2 are electrically connected to GND, the other end of the resistor R1 is electrically connected to one end of the 2-pin EN and the resistor R5 of the buck conversion chip N14, and the other end of the resistor R5 is electrically connected to GND; one end of the resistor R4 is electrically connected with a 6 pin FREQ of the buck conversion chip N14, and the other end of the resistor R4 is electrically connected with GND; a 5 pin GND of a buck conversion chip N14 is electrically connected to GND, an 8 pin BST of a buck conversion chip N14 is electrically connected to one end of a capacitor C1, the other end of the capacitor C1 is electrically connected to a 1 pin SW of a buck conversion chip N14, a diode D1 and one end of an energy storage inductor L1, in this embodiment, a diode D1 is defined as a freewheeling diode to provide current when the switching tube is turned off, L1 is an energy storage inductor to provide constant current to the load, a large current design enables a lower ripple voltage to be output, the other end of a diode D1 is electrically connected to GND, a 3 pin COMP of a buck conversion chip N14 is electrically connected to one end of a capacitor C4, the other end of a capacitor C4 is electrically connected to one end of a resistor R6, the other end of a resistor R6 is electrically connected to one end of the resistor R7, a 4 pin FB of a buck conversion chip N14 is electrically connected to one end of a resistor R3 and one end of a resistor R7, the other end of the resistor R3 is electrically connected to one end of the resistor R2, the load terminal V _12 is electrically connected to the other end of the inductor L1, the other end of the resistor R2 and one end of the capacitor C3, and the other end of the capacitor C3 is electrically connected to GND.

Referring to fig. 1, in the embodiment of the present invention, the voltage dividing circuit 3 includes a resistor R2, a resistor R3, and a resistor R7, and the resistor R2, the resistor R3, and the resistor R7 are connected in series for feeding back the output voltage to the buck conversion chip N14 to be compared with an internal reference value, so that the output voltage meets the set output requirement.

Referring to fig. 1, in the embodiment of the present invention, the compensation circuit 5 includes a capacitor C4 and a resistor R6, and the capacitor C4 is connected in series with the resistor R6 for compensating the frequency of the control loop.

Referring to fig. 1, in the embodiment of the present invention, the enable control circuit 6 includes a resistor R1 and a resistor R5, and is configured to control the buck conversion chip N14 to be turned on and off, where the voltage input to pin 2 EN of the buck conversion chip N1 is greater than 3.0V and the output voltage is started, and the buck conversion IC is in a shutdown mode when the voltage is lower than 1.2V, so as to save more electric energy.

Referring to fig. 1, in the embodiment of the present invention, the resistor R4 is used for programming the switching frequency of the buck converter chip N14, so as to set the switching frequency;

the frequency versus resistance correspondence is shown in the following table:

R(KΩ)	FS (megahertz)
		18	4
20	3.8
		22.1	3.5
24	3.3
		26.7	23
30	2.8
		33.2	2.5

Referring to fig. 1, the capacitor C2 and the capacitor C3 are ceramic capacitors for keeping the voltage ripple at a high frequency to a minimum

Specifically, this electrostatic sprayer power voltage stabilizing circuit's theory of operation: the input current of a V + end of a power supply is filtered by a capacitor C2 to reduce the ripple of the power supply, when the input voltage of a transient suppressor T11 is too high, the transient suppressor is conducted to pull down the power supply voltage to prevent the power-on transient voltage from being too high and damaging a buck conversion chip N14, when the voltage input by a pin 2 EN of the buck conversion chip N14 is more than 3.0V, the buck conversion chip N14 starts the output voltage, when the voltage is less than 1.2V, the buck conversion chip N14 is in a shutdown mode, when the output voltage of a pin 1 SW of the buck conversion chip N14 is increased, the voltage divided by a voltage dividing circuit 3 consisting of a resistor R2, a resistor R3 and a resistor R7 is also increased to be fed back to an FB end of the buck conversion chip N14, after the internal error amplifier is compared with an internal reference voltage, an internal MOSFET is controlled to reduce the output voltage until the output voltage reaches a stable output voltage, and when the output voltage of the pin 1 SW of the buck conversion chip N14, the voltage divided by the resistor R2, the resistor R3 and the resistor R7 is also reduced and fed back to the FB end, and after the voltage is compared with the internal reference voltage by the internal error amplifier, the internal MOSFET is controlled to increase the output voltage until the output voltage reaches a stable voltage output state, so that the voltage output to the voltage boosting device is always kept stable, the mist droplet charging capability is kept stable, and the problems that the voltage inside a battery of the existing electrostatic sprayer equipment is unstable, the final output voltage of the voltage boosting device is lower than or higher than the set output voltage, the mist droplet charging capability is reduced, the adsorption capability of a sprayed object is weakened, pesticide mist droplets which are not adsorbed by the sprayed object are scattered to the ground, environmental pollution and resource waste are caused, and the spraying effect is not ideal are solved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply voltage stabilizing circuit of an electrostatic atomizer is characterized by comprising a transient suppressor T1(1), a frequency setting resistor R4(2), a voltage dividing circuit (3), a voltage reduction conversion chip N1(4), a compensating circuit (5) and an enabling control circuit (6); the transient suppressor T1(1) is electrically connected with the output end of a power supply, the buck conversion chip N1(4) is electrically connected with the transient suppressor, the frequency setting resistor R4(2), the voltage division circuit (3), the compensation circuit (5) and the enable control circuit (6) respectively, and the transient suppressor T1(1) is electrically connected with the enable control circuit (6);

the power supply input V + end is electrically connected with the transient suppressor T1(1), the capacitor C2, the resistor R1 and one end of a 7-pin VIN of the buck conversion chip N1(4), the transient suppressor T1(1) and the other end of the capacitor C2 are electrically connected with GND, the other end of the resistor R1 is electrically connected with a 2-pin EN of the buck conversion chip N1(4) and one end of the resistor R5, and the other end of the resistor R5 is electrically connected with GND; one end of the resistor R4 is electrically connected with a 6-pin FREQ of the buck conversion chip N1(4), and the other end of the resistor R4 is electrically connected with GND; a 5 pin GND of the buck conversion chip N1(4) is electrically connected with GND, an 8 pin BST of the buck conversion chip N1(4) is electrically connected with one end of a capacitor C1, the other end of the capacitor C1 is electrically connected with a 1 pin SW of the buck conversion chip N1(4), one end of a diode D1 and one end of an energy storage inductor L1, and the other end of a diode D1 is electrically connected with GND;

a pin 3 COMP of the buck conversion chip N1(4) is electrically connected with one end of a capacitor C4, the other end of the capacitor C4 is electrically connected with one end of a resistor R6, and the other end of the resistor R6 is electrically connected with GND;

a 4 pin FB of the buck conversion chip N1(4) is electrically connected to one ends of the resistor R3 and the resistor R7, the other end of the resistor R7 is electrically connected to GND, and the other end of the resistor R3 is electrically connected to one end of the resistor R2;

2. The voltage regulator circuit of claim 1, wherein the transient suppressor T1(1) is a transient suppressor diode for preventing the step-down converter N1(4) from being damaged by an excessive voltage at the power-on instant.

3. The electrostatic atomizer power supply voltage stabilizing circuit of claim 1, wherein: the voltage division circuit (3) comprises a resistor R2, a resistor R3 and a resistor R7, wherein the resistor R2, the resistor R3 and the resistor R7 are connected in series and used for feeding back the output voltage to the buck conversion chip N1(4) to be compared with an internal reference value, and then the output voltage meets the set output requirement.

4. The electrostatic atomizer power supply voltage stabilizing circuit of claim 1, wherein: the compensation circuit (5) comprises a capacitor C4 and a resistor R6, wherein the capacitor C4 is connected with the resistor R6 in series and is used for compensating the frequency of the control loop.

5. The electrostatic atomizer power supply voltage stabilizing circuit of claim 1, wherein: the enabling control circuit (6) comprises a resistor R1 and a resistor R5 and is used for controlling the buck conversion chip N1(4) to be switched on and off.

6. The electrostatic atomizer power supply voltage stabilizing circuit of claim 1, wherein: the buck conversion chip N1(4) is a wide input range IC.

7. The electrostatic atomizer power supply voltage stabilizing circuit of claim 1, wherein: the resistor R4 is used for programming the switching frequency of the buck conversion chip N1(4) and setting the switching frequency.

8. The electrostatic atomizer power supply voltage stabilizing circuit of claim 1, wherein: the capacitor C2 and the capacitor C3 are ceramic capacitors.