CN217927403U

CN217927403U - Device for controlling alternating current irrigation electromagnetic valve by direct current

Info

Publication number: CN217927403U
Application number: CN202221686168.9U
Authority: CN
Inventors: 周和成
Original assignee: Ningbo Yilin Aguatech Co ltd
Current assignee: Ningbo Yilin Aguatech Co ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-11-29
Anticipated expiration: 2032-07-01

Abstract

The utility model discloses a realize device of control alternating current irrigation solenoid valve with direct current, include: a DC-DC converter for converting an input DC to an output current-limited DC driving voltage; switch and sampling module for switch on or break under the control of opening the valve signal exchange the current path of irrigating the solenoid valve, sample simultaneously and transmit operating current extremely DC-DC direct current converter is with control DC-DC direct current converter's output current, through the utility model discloses, can solve the drawback that traditional alternating current irrigator's alternating current irrigates the solenoid valve that the electromagnetism head starts the easy burning out.

Description

Device for controlling alternating current irrigation electromagnetic valve by direct current

Technical Field

The utility model relates to a controlling means especially relates to a device of solenoid valve is irrigated to realization control interchange with direct current.

Background

The circuit structure of the traditional agricultural irrigator is shown in figure 1 and consists of two parts, namely an alternating-current 24V controlled power supply and an alternating-current 24V electromagnetic valve. The electromagnetic valve used by the mainstream agricultural irrigator in the market at present is generally driven by alternating current 24V voltage, the action current of an electromagnetic head of the general alternating current 24V electromagnetic valve is 300-500mA, and the continuous working pull-in current is 100-250mA. In actual use, due to the fact that water is dirty or foreign matters are in water, the phenomenon of blocking is caused when a movable iron core in the electromagnetic head acts, and as a result, inductance formed by the electromagnetic head is reduced, working current of the alternating current 24V electromagnetic valve is large, loss heating of the electromagnetic head far exceeds heating conditions in normal working, and the electromagnetic head of the alternating current irrigation electromagnetic valve is prone to being burnt out due to over-temperature.

SUMMERY OF THE UTILITY MODEL

For overcoming the not enough of above-mentioned prior art existence, the utility model aims to provide a realize controlling device of alternating current irrigation solenoid valve with direct current to utilize direct current voltage (electric current) to replace alternating current voltage (electric current) drive to exchange agricultural irrigation solenoid valve, the drawback of the alternating current irrigation solenoid valve's of having solved traditional alternating current irrigator electromagnetism head start-up easy burning out.

In order to achieve the above and other objects, the present invention provides a device for controlling an ac irrigation solenoid valve with dc, the device comprising:

a DC-DC converter for converting an input DC to an output current-limited DC driving voltage;

the switch and sampling module is used for switching on or switching off a current path of the alternating current irrigation electromagnetic valve under the control of a valve opening signal, sampling working current and transmitting the working current to the DC-DC direct current converter so as to control the output current of the DC-DC direct current converter;

preferably, the DC-DC converter comprises a DC/DC converting and voltage stabilizing chip, the input DC is connected to the power input end of the DC/DC converting and voltage stabilizing chip, the current detecting end of the DC/DC converting and voltage stabilizing chip is connected to the switch and sampling module, the feedback end forms a DC driving voltage node through a first feedback resistor (R1) and a first feedback capacitor (C1) connected in parallel and is connected to the ac irrigation solenoid valve, the DC driving voltage node and the switch output end of the DC/DC converting and voltage stabilizing chip are connected to an energy storage inductor (L1), and a freewheeling diode (D1) is connected between the switch output end of the DC/DC converting and voltage stabilizing chip and ground.

Preferably, an electrolytic capacitor (C2) is further connected between the direct current driving voltage node of the DC-DC direct current converter and the ground for storing electricity so as to provide valve-opening driving energy in the initial stage of valve opening.

Preferably, a burr filtering capacitor (C3) is further connected between the direct-current driving voltage node of the DC-DC direct-current converter and the ground.

Preferably, a second feedback resistor (R2) is further connected between the feedback end of the DC/DC conversion voltage stabilizing chip and the ground end.

Preferably, the anode of the freewheeling diode is grounded, and the cathode of the freewheeling diode is connected with the switch output end of the DC/DC conversion voltage stabilizing chip.

Preferably, the switch and sampling module includes an MOS switch tube (Q1), a first bias resistor (R3), a second bias resistor (R4) and a sampling resistor (R5), an externally input valve opening signal is connected to one end of the first bias resistor (R3), the other end of the first bias resistor (R3) is connected to the gate of the MOS switch tube (Q1) and grounded through the second bias resistor (R4), one end of the MOS switch tube (Q1) is connected to the ac irrigation solenoid valve, the other end outputs a current limiting detection signal to the current detection end of the DC/DC conversion voltage stabilization chip and grounded through the sampling resistor (R5), and the other end of the second bias resistor (R4) is grounded.

Preferably, the MOS switch tube (Q1) is an NMOS switch tube, a drain thereof is connected to the ac irrigation solenoid valve, and a source thereof is connected to one end of the sampling resistor (R5) and a current detection end of the DC/DC conversion voltage stabilization chip.

Compared with the prior art, the utility model relates to a device of using direct current to realize control alternating current irrigation solenoid valve is through adopting direct current 24V constant voltage output control when starting, the short time action begins the actuation action for alternating current irrigation solenoid valve's electromagnetic head with the electric quantity of driving voltage output end electrolytic capacitor storage this moment, DC/DC conversion steady voltage chip output changes current-limiting constant current output mode into after the electromagnetic head begins the actuation, the solenoid valve that constant current 250MA output can make different producers produce can both continuously work, because the maximum operating current is injectd in 250MA, even move the iron core card stifled can not cause the overheated burnout of electromagnetic head yet, the drawback that traditional alternating current irrigation solenoid valve electromagnetic head started to burn out easily has been solved.

Drawings

FIG. 1 is a schematic diagram of a conventional agricultural irrigator circuit;

fig. 2 is a block diagram of an apparatus for controlling an ac irrigation solenoid valve using dc in an exemplary embodiment of the present invention.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following description, which is made for the purpose of illustrating the embodiments of the present invention by way of specific examples and with reference to the accompanying drawings. The present invention can be implemented or applied by other different embodiments, and various details in the present specification can be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

Fig. 2 is a block diagram of an apparatus for controlling an ac irrigation solenoid valve using dc in an exemplary embodiment of the present invention. As shown in FIG. 2, the utility model relates to a device for controlling an AC irrigation solenoid valve by DC, which comprises a DC-DC converter 10 and a switch and sampling module 20

The DC-DC direct-current converter 10 comprises a DC/DC conversion voltage-stabilizing chip IC1, a first feedback resistor R1, a first feedback capacitor C1, a second feedback resistor R2, an energy storage inductor L1, a freewheeling diode D1, a burr filtering capacitor C3 and an electrolytic capacitor C2, and is used for converting an input direct current DC36V into a direct current 24V driving voltage with limited output current to be supplied to the alternating-current irrigation electromagnetic valve 30 for working;

the switching and sampling module 20 comprises an NMOS switching tube Q1, a first bias resistor R3, a second bias resistor R4 and a sampling resistor R5, and is used for switching on or off a current path of the ac irrigation electromagnetic valve 30 under the control of a valve opening signal, and simultaneously sampling and transmitting working current to the DC-DC converter 10 to control output current of the DC-DC converter 10;

the ac irrigation electromagnetic valve 30 is configured to operate under the control of the switching and sampling module 20 by using the DC 24V driving voltage with limited output current output by the DC-DC converter 10 as a working power supply.

Specifically, an input direct current DC36V is connected to a power input end VIN (pins 7 and 8) of the DC/DC conversion voltage stabilization chip IC1, a switch output end SW (pins 1 and 2) of the DC/DC conversion voltage stabilization chip IC1 is connected to a cathode of the freewheeling diode D1 and one end of the energy storage inductor L1, the other end of the energy storage inductor L1 is connected to a common end of the first feedback resistor R1 and the first feedback capacitor C1 in parallel, one end of the filtering capacitor C3 and one end of the electrolytic capacitor C2 to form a direct current 24V driving voltage node, the direct current 24V driving voltage node is further connected to one end of the alternating current irrigation solenoid valve 30, the first feedback resistor R1 and the other common end of the first feedback capacitor C1 in parallel are connected to one end of the second feedback resistor R2 and a feedback end (pin 4) of the DC/DC conversion voltage stabilization chip IC1, an anode of the diode D1, the other end of the second feedback resistor R2 and a ground end (pin 3) of the DC/DC conversion voltage stabilization chip IC1 are grounded; an externally input valve opening signal is connected to one end of a first bias resistor R3, the other end of the first bias resistor R3 is connected to one end of a second bias resistor R4 and a grid electrode of an NMOS switch tube Q1, a drain electrode D of the NMOS switch tube Q1 is connected to the other end of an alternating current irrigation electromagnetic valve 30, a source electrode of the MOS switch tube Q1 is connected with one end of a sampling resistor R5 and a current detection end CS (5 pin) of a DC/DC conversion voltage stabilization chip IC1, and the other end of the second bias resistor R4 and the other end of the sampling resistor R5 are grounded.

The principle of the utility model is as follows: the DC-DC converter 10 and the switch and sampling module 20 form a driving circuit of the AC irrigation electromagnetic valve 30, wherein the DC-DC converter 10 realizes that the fixed output DC voltage is 24V through a DC/DC conversion voltage stabilization chip IC1, the DC/DC conversion voltage stabilization chip IC1 has an output current limiting function at the same time, the switch and sampling module 20 collects the actual working current to the DC/DC conversion voltage stabilization chip IC1 through a sampling resistor R5, the maximum current limiting of the output current is 250mA, thereby achieving the effect of controlling the output current by controlling the output voltage, namely substantially realizing the voltage stabilization current limiting output function: and starting to output at a constant voltage, and changing the output voltage through current feedback to keep the output current in a maximum current output state all the time. Because the direct current resistance of the AC24V alternating current irrigation electromagnetic valve 30 is generally below 50 ohms, the normal output current is larger than 480mA, namely under the condition that the DC/DC conversion voltage stabilization chip IC1 outputs 24V, the AC irrigation electromagnetic valve is driven to work in a current limiting state, and thus, different electromagnetic valves can be matched with the driving circuit. The direct-current 24V output and the drain electrode D of the MOS switch tube Q1 are connected with an alternating-current irrigation electromagnetic valve, when the alternating-current irrigation electromagnetic valve does not work, a valve opening signal is in a low level, the MOS switch tube Q1 is in a non-conduction and off state, the alternating-current irrigation electromagnetic valve does not work, and the alternating-current irrigation electromagnetic valve can be driven to open and work only when the valve opening signal is in a high level; the electrolytic capacitor C2 can store electric quantity, provides valve opening driving energy at the initial stage of valve opening, can enable the instantaneous current of the alternating current irrigation electromagnetic valve to reach more than 500mA, and achieves the function of large suction force of initial action.

Specifically, the utility model discloses adopt direct current 24V driving voltage constant voltage output control during the start-up, the short time action at this moment begins the actuation action for the electromagnetic head of alternating-current irrigation solenoid valve 30 with the electric quantity of the electrolytic capacitor C2 storage of direct current 24V driving voltage output, the electromagnetic head begins actuation action after the actuation of electromagnetic head, the drive circuit output changes the current-limiting constant current output mode into, the electromagnetic head of alternating-current irrigation solenoid valve of selling on the constant current 250mA output can drive market, can make the solenoid valve of different producer production can both continuously work, even move the iron core and have the stifled phenomenon of card, because the biggest operating current is injectd at 250mA, even move the iron core card stifled also can not cause the overheated burnout of electromagnetic head, the drawback of the electromagnetic head of traditional irrigator that has solved and has started easily burnt out.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be as set forth in the claims.

Claims

1. An apparatus for controlling an ac irrigation solenoid valve using dc power, the apparatus comprising:

and the switching and sampling module is used for switching on or switching off a current path of the alternating current irrigation electromagnetic valve under the control of a valve opening signal, sampling working current and transmitting the working current to the DC-DC direct current converter so as to control the output current of the DC-DC direct current converter.

2. The device for controlling the alternating current irrigation solenoid valve according to claim 1, wherein the device comprises: the DC-DC direct current converter comprises a DC/DC conversion voltage stabilizing chip, wherein input direct current is connected to a power input end of the DC/DC conversion voltage stabilizing chip, a current detection end of the DC/DC conversion voltage stabilizing chip is connected with the switch and the sampling module, a direct current driving voltage node is formed by a feedback end through a first feedback resistor (R1) and a first feedback capacitor (C1) which are connected in parallel and is connected to the alternating current irrigation electromagnetic valve, the direct current driving voltage node and a switch output end of the DC/DC conversion voltage stabilizing chip are connected with an energy storage inductor (L1), and a freewheeling diode (D1) is connected between the switch output end of the DC/DC conversion voltage stabilizing chip and the ground.

3. The device for controlling the alternating current irrigation solenoid valve according to claim 2, wherein the device comprises: an electrolytic capacitor (C2) is also connected between the direct current driving voltage node of the DC-DC direct current converter and the ground for storing electricity so as to provide valve opening driving energy at the initial stage of valve opening.

4. An apparatus for controlling an ac irrigation solenoid valve according to claim 3, wherein said apparatus comprises: and a burr filtering capacitor (C3) is also connected between the direct-current driving voltage node of the DC-DC direct-current converter and the ground.

5. The device for controlling the alternating current irrigation solenoid valve according to claim 4, wherein the device comprises: and a second feedback resistor (R2) is also connected between the feedback end of the DC/DC conversion voltage stabilizing chip and the ground end.

6. The device for controlling the alternating current irrigation solenoid valve according to claim 5, wherein the device comprises: the anode of the freewheeling diode is grounded, and the cathode of the freewheeling diode is connected with the switch output end of the DC/DC conversion voltage stabilizing chip.

7. The apparatus of claim 6, wherein the means for controlling the ac irrigation solenoid valve with dc comprises: switch and sampling module include MOS switch tube (Q1), first biasing resistance (R3), second biasing resistance (R4) and sampling resistance (R5), and the valve opening signal of external input is connected to the one end of first biasing resistance (R3), the other end of first biasing resistance (R3) is connected the grid of MOS switch tube (Q1), and pass through second biasing resistance (R4) ground connection, MOS switch tube (Q1) one end is connected the alternating current irrigation solenoid valve, and the other end output current-limiting detects the signal extremely the current detection end of DC/DC conversion steady voltage chip, and pass through sampling resistance (R5) ground connection, the other end ground connection of second biasing resistance (R4).

8. The device for controlling the alternating current irrigation solenoid valve by direct current according to claim 7, wherein: the MOS switch tube (Q1) is an NMOS switch tube, the drain electrode of the MOS switch tube is connected with the alternating current irrigation electromagnetic valve, and the source electrode of the MOS switch tube is connected with one end of the sampling resistor (R5) and the current detection end of the DC/DC conversion voltage stabilization chip.