CN218208053U - Multi-station irrigation controller without built-in power frequency transformer - Google Patents
Multi-station irrigation controller without built-in power frequency transformer Download PDFInfo
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- CN218208053U CN218208053U CN202221686164.0U CN202221686164U CN218208053U CN 218208053 U CN218208053 U CN 218208053U CN 202221686164 U CN202221686164 U CN 202221686164U CN 218208053 U CN218208053 U CN 218208053U
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Abstract
The utility model discloses a controller is irrigated to no built-in power frequency transformer's multistation, include: the alternating current-direct current converter is used for converting the power frequency voltage into a first direct current and a second direct current to be respectively provided for the alternating current electromagnetic valve and the control module; the control module is used for taking the second direct current as a power supply and outputting a pulse width modulation signal; the switching module is used for switching on or switching off a current path of the alternating current electromagnetic valve under the control of the pulse width modulation signal; alternating current solenoid valve is used for switch module's control under switch module switches on or off irrigates and cut off the rivers valve, the utility model discloses can solve traditional multistation regularly irrigate the controller because the not high heat loss problem that causes of power frequency transformer conversion efficiency.
Description
Technical Field
The utility model relates to a controller is irrigated to multistation, especially relates to a controller is irrigated to multistation that does not have built-in power frequency transformer.
Background
At present, in a multi-site irrigation controller on the market, an AC solenoid valve with a rated voltage of AC24V is generally adopted as an irrigation solenoid valve to be controlled, so that a power frequency transformer is generally adopted as an essential component in the technical scheme of the controller, as shown in fig. 1, a conventional multi-site irrigation controller comprises a power frequency transformer T1, an AC-to-DC converter (AC/DC) U1, a control module U2, a current-limiting resistor R1, a thyristor TR1 and an AC solenoid valve AV1, wherein the power frequency transformer T1 converts a power frequency voltage AC220V into an AC24V to provide a working power supply for the AC solenoid valve AV1, and simultaneously, the AC24V is converted into a DC voltage by the AC-to-DC converter (AC/DC) U1 and then provides a DC power supply for the control module U2 of the irrigation controller, and the control module U2 outputs a control signal which is connected to a control gate of the thyristor TR1 after passing through the current-limiting resistor R1 to connect or disconnect a current path of the AC solenoid valve AV1.
Although the multi-station irrigation controller has the advantages of simple structure and convenience in maintenance, the determination of large standby power consumption and large machine heating exists, particularly, the phenomenon that a power frequency transformer is easy to burn and damage exists under the condition of high ambient temperature, and the phenomenon that electronic components in the controller are easy to age and damage is caused by overhigh temperature of heating and accumulating.
SUMMERY OF THE UTILITY MODEL
For overcoming the not enough of above-mentioned prior art existence, the utility model aims to provide a do not have built-in power frequency transformer's multistation irrigation control ware to reduce traditional multistation irrigation control ware because the not high heat loss problem that causes of power frequency transformer conversion efficiency has improved the reliability and the environmental suitability of machine.
In order to achieve the above and other objects, the utility model provides a controller is irrigated to multistation that does not have built-in power frequency transformer, controller is irrigated to multistation includes:
the alternating current-direct current converter is used for converting the power frequency voltage into a first direct current and a second direct current to be respectively supplied to the alternating current electromagnetic valve and the control module;
the control module is used for taking the second direct current as a power supply and outputting a pulse width modulation signal;
the switching module is used for switching on or switching off a current path of the alternating current electromagnetic valve under the control of the pulse width modulation signal;
and the alternating current electromagnetic valve is used for switching on or off the irrigation water flow switching-on valve under the control of the switch module.
Preferably, the controller further comprises a low-pass filter connected between the ac-dc converter and the ac solenoid valve for filtering the first dc-filtered harmonic to provide to the ac solenoid valve.
Preferably, the switch module adopts an NPN switch tube.
Preferably, a collector of the NPN switching tube is connected to the ac solenoid valve, a base of the NPN switching tube is connected to the control module through a current-limiting resistor, and an emitter of the NPN switching tube is grounded.
Preferably, the control module outputs a pulse width modulation signal with a duty cycle of 50%.
Compared with the prior art, the utility model relates to a do not have built-in power frequency transformer's multistation irrigation controller is through adopting AC/DC switching power supply module in order to solve traditional multistation irrigation controller because the not high heat loss problem that causes of power frequency transformer conversion efficiency, because switching power supply's conversion efficiency can reach more than 92%, and power frequency transformer's conversion efficiency only 70-80% (standby low current condition lower efficiency), just so to a great extent has reduced because the not high heat loss that causes of conversion efficiency, the degree of generating heat that makes the machine step-down, the reliability and the environmental fitness of machine have been improved.
Drawings
FIG. 1 is a schematic diagram of a conventional multi-site irrigation controller architecture;
fig. 2 is a block diagram of a multi-station irrigation controller without a built-in power frequency transformer according to 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 structural diagram of a multi-station irrigation controller without a built-in power frequency transformer according to an exemplary embodiment of the present invention. As shown in fig. 2, the utility model relates to a do not have multistation irrigation control ware of built-in power frequency transformer, including alternating current direct current converter (AC/DC) U1, control module U2, low pass filter F1, switch module Q1 and alternating current solenoid valve AV1.
The device comprises an alternating current direct current converter (AC/DC) U1, a first direct current DC1 and a second direct current DC2, wherein the alternating current direct current converter (AC/DC) U1 is used for converting a power frequency voltage AC220V into two paths of direct current voltages; the control module U2 is configured to use the second direct current DC2 as a power supply and output a pulse width modulation signal PWM, for example, the control module U2 may output the pulse width modulation signal PWM according to a set irrigation control parameter, and if the irrigation time is set by a user, the control module U2 generates and outputs the pulse width modulation signal PWM when the set irrigation time is reached, preferably, the frequency of the pulse width modulation signal PWM is 50HZ, and the duty ratio is 50%; the low-pass filter F1 is used for filtering harmonic waves of the first direct current DC1 and supplying the harmonic waves to the alternating current electromagnetic valve AV1 so as to ensure that voltage and current supplied to the alternating current electromagnetic valve AV1 are harmonic-free alternating current; the switching module Q1 is used for switching on or off a current path of the alternating current solenoid valve AV1 under the control of the output pulse width modulation signal PWM, in the embodiment of the present invention, the switching module Q1 may be an NPN switching tube Q1, but the present invention is not limited thereto, and the current limiting resistor R1 is connected between the control module U2 and the switching module Q1 for current limiting protection and isolation; and the alternating current electromagnetic valve AV1 is used for switching on or switching off the irrigation water flow valve under the control of the switch module Q1.
In a specific embodiment of the present invention, the switching module Q1 adopts an NPN switching tube Q1, specifically, the power frequency voltage AC220V is input to an input end of an alternating current-direct current converter (AC/DC) U1; a first direct current DC1 output by an alternating current direct current converter (AC/DC) U1 is connected to the input end of a low-pass filter F1, the output end of the low-pass filter F1 is connected to one end of an alternating current electromagnetic valve AV1, and the other end of the alternating current electromagnetic valve AV1 is connected to the collector of an NPN switching tube Q1; a second direct current DC2 output by an alternating current direct current converter (AC/DC) U1 is connected to the positive power input end of a control module U2, and a pulse width modulation signal PWM output by the control module U2 is connected to the base electrode of an NPN switching tube Q1 through a current limiting resistor R1; the ground end of an alternating current-direct current (AC/DC) converter U1, the negative end of the power input of the control module U2 and the emitter of the NPN switching tube Q1 are grounded.
The utility model discloses the principle as follows: an AC/DC converter U1 adopting an AC/DC switching power supply provides a DC power supply required by an AC electromagnetic valve, namely a first DC1, and simultaneously outputs a DC2 required by a control module U2, the control module U2 outputs a PWM signal to drive the AC24V AC electromagnetic valve to work, the PWM signal is a square wave signal with the frequency of 50HZ and the duty ratio of 50%, and a 50HZ low-pass filter is added at the output end, so that the realized driving effect is equal to that of the AC24V power frequency transformer to output and drive the AC electromagnetic valve.
It is thus clear that the utility model discloses a AC/DC switching power supply module, because switching power supply's conversion efficiency can reach more than 92%, and power frequency transformer's conversion efficiency only 70-80% (standby undercurrent condition is lower in efficiency), reduced to a great extent like this because the not high heat loss that causes of conversion efficiency, the degree of generating heat that makes the machine step-down, improved the reliability and the environmental fitness of machine.
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 (5)
1. A multi-site irrigation controller without a built-in power frequency transformer, the multi-site timed irrigation controller comprising:
the alternating current-direct current converter is used for converting the power frequency voltage into a first direct current and a second direct current to be respectively provided for the alternating current electromagnetic valve and the control module;
the control module is used for taking the second direct current as a power supply and outputting a pulse width modulation signal;
the switching module is used for switching on or switching off a current path of the alternating current electromagnetic valve under the control of the pulse width modulation signal;
and the alternating current electromagnetic valve is used for switching on or off the irrigation water flow switching-on valve under the control of the switch module.
2. The multi-station irrigation controller without the built-in power frequency transformer of claim 1, characterized in that: the controller further comprises a low-pass filter connected between the AC-DC converter and the AC solenoid valve and used for filtering the first DC harmonic and providing the harmonic to the AC solenoid valve.
3. The multi-site irrigation controller without a built-in power frequency transformer of claim 2, wherein: the switch module adopts an NPN switch tube.
4. The multi-site irrigation controller without a built-in power frequency transformer of claim 3, wherein: and a collector of the NPN switching tube is connected with the alternating current electromagnetic valve, a base of the NPN switching tube is connected with the control module through a current-limiting resistor, and an emitter of the NPN switching tube is grounded.
5. The multi-site irrigation controller without a built-in power frequency transformer of claim 4, wherein: the control module outputs a pulse width modulation signal with a duty ratio of 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221686164.0U CN218208053U (en) | 2022-07-01 | 2022-07-01 | Multi-station irrigation controller without built-in power frequency transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221686164.0U CN218208053U (en) | 2022-07-01 | 2022-07-01 | Multi-station irrigation controller without built-in power frequency transformer |
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| Publication Number | Publication Date |
|---|---|
| CN218208053U true CN218208053U (en) | 2023-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221686164.0U Active CN218208053U (en) | 2022-07-01 | 2022-07-01 | Multi-station irrigation controller without built-in power frequency transformer |
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| CN (1) | CN218208053U (en) |
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- 2022-07-01 CN CN202221686164.0U patent/CN218208053U/en active Active
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