Solenoid valve free cascade control device without address code

Abstract

The utility model discloses an electromagnetic valve free cascade control device without an address code. A circuit board is arranged for a single electromagnetic valve, and a control chip, an input and output interface, a receiving circuit and a transmitting circuit are arranged on the circuit board. A data receiving module, a data interception module and a data forwarding module are arranged in the control chip; and the data receiving module receives communication data from the previous adjacent electromagnetic valve or the upper computer. The data interception module intercepts a first data segment in the received communication data sequence. And the data forwarding module forwards the communication data sequence left after the current electromagnetic valve is intercepted to the subsequent electromagnetic valve, so that communication cascading of the electromagnetic valves is realized. According to the device, a strategy of intercepting a first data segment and forwarding residual data segments is adopted, each electromagnetic valve obtains the data segment corresponding to the cascading position of the electromagnetic valve from a data sequence from an upper computer, communication addresses do not need to be arranged on the electromagnetic valves, the specific number is not limited, and free cascading is achieved.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve control technology, and more specifically, to a solenoid valve free cascading control device that does not require address codes. Background Technology

[0002] Solenoid valves are fundamental actuators for controlling fluids and are widely used in industrial applications. In situations involving a large number of solenoid valves, the following problems exist: 1. Each solenoid valve requires two wires, leading to numerous and messy cables in the field, a large amount of wiring work, and difficulties in troubleshooting. Cable costs are also significant. 2. Each solenoid valve requires a dedicated output port on the host computer, increasing cost, size, and power consumption. To address problem 1, multi-pin integrated manifold solutions have emerged. This solution mounts multiple solenoid valves side-by-side on the manifold, streamlining the cables and effectively solving the problems of messy cables and time-consuming installation. However, it does not save on cables or solve problem 2. To address problem 2, bus communication valve island solutions have emerged. Based on the multi-pin integrated manifold solution, multiple solenoid valves share a conversion module, occupying one communication address, forming a valve island. Multiple valve islands are connected to the host computer via a fieldbus, but each solenoid valve still requires an output port on the conversion module.

[0003] The solutions described above share a common characteristic: the coils of each solenoid valve are directly connected to the host computer or a conversion module. When there are a large number of solenoid valves, this direct connection method leads to problems related to reliability, cost, size, and difficulty in expansion.

[0004] A conventional approach, similar to RS485 Modbus, can be used to achieve cascaded communication between multiple solenoid valves. However, this requires assigning a communication address to each solenoid valve, which is extremely inconvenient for engineering applications. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of reliability, cost, size, and difficulty in expansion caused by direct connection between the solenoid valve and the host computer, or between the solenoid valve and the conversion module.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0007] This invention provides a novel solenoid valve control device. For a single solenoid valve, a circuit board is provided, on which a control chip, input interface, output interface, receiving circuit, transmitting circuit, and coil drive circuit are mounted. The control chip integrates a data receiving module, a data interception module, and a data forwarding module.

[0008] The data receiving module receives communication data from the previous adjacent solenoid valve or the host computer through the input interface and receiving circuit.

[0009] The data interception module intercepts the first data segment in the received communication data sequence, and the intercepted data segment is used to control the coil of the solenoid valve itself.

[0010] The data forwarding module forwards the remaining communication data sequence after the current solenoid valve intercepts it to the subsequent solenoid valve through the output interface, thereby realizing the communication cascading of solenoid valves.

[0011] The coil drive circuit described above drives the coil of the solenoid valve according to the content of the truncated data segment.

[0012] Furthermore, the various solenoid valves are cascaded via input and output interfaces. Except for the first solenoid valve, each solenoid valve connects to the output interface of the preceding adjacent solenoid valve via its input interface, receiving communication data from the preceding adjacent solenoid valve. Specifically, the input interface of the first solenoid valve is connected to the host computer, receiving communication data from the host computer. The communication data sequence contains multiple data segments.

[0013] This utility model also provides a solenoid valve free cascading control device without address code. Based on the designed solenoid valve, the input interface and output interface in the circuit board are used to realize the cascading between various solenoid valves. Specifically, a non-directly connected communication signal line is set in each of the input interface and output interface, and a pair of directly connected power lines are also provided.

[0014] Furthermore, the communication signals of each solenoid valve are cascaded in a non-directly connected manner through the control chip.

[0015] Furthermore, there is no specific limit to the number of solenoid valves participating in the cascade in this utility model;

[0016] Furthermore, in this invention, the solenoid valves participating in the cascade do not need to be programmed with communication addresses, but only use a single communication signal line, which can be a single-ended transmission UART format or a single-line return-to-zero code format, and do not require synchronization clock, enable, or latch signals.

[0017] Furthermore, to improve reliability, differential transmission can be used for communication signals.

[0018] Furthermore, when the number of data segments sent by the host computer exceeds the actual number of cascaded solenoid valves, the excess data segments will be output by the last solenoid valve and discarded. Conversely, when the number of data segments sent by the host computer is less than the actual number of cascaded solenoid valves, the solenoid valves at the later stages of the cascade will remain unchanged because they cannot obtain valid data segments.

[0019] Therefore, the number of data transmission segments in this invention need not be strictly equal to the number of cascaded solenoid valves.

[0020] The beneficial effects of this utility model are as follows:

[0021] This invention employs a strategy of "intercepting the first data segment and forwarding the remaining data segments," allowing the solenoid valve control chip to naturally obtain the data segment corresponding to its cascade position from the data sequence sent by the host computer, eliminating the need to assign communication addresses to each solenoid valve. The specific number of solenoid valves is also unlimited, enabling free cascading.

[0022] Compared to the direct connection of communication lines from beginning to end, this invention adopts an indirect data forwarding strategy, in which each solenoid valve itself acts as a communication relay, effectively avoiding signal attenuation and distortion over long distances. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the present invention;

[0024] Figure 2 This is a schematic diagram illustrating the data reception, interception, and forwarding of this utility model;

[0025] Figure 3 This is a schematic diagram of the circuit implementation of this utility model. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, this utility model provides a novel solenoid valve. For a single solenoid valve, a circuit board is provided, and the circuit board is provided with a control chip, an input interface, an output interface, a receiving circuit, a transmitting circuit, and a coil driving circuit.

[0028] The control chip receives communication data from the preceding adjacent solenoid valve or the host computer via an input interface and a receiving circuit. The communication data sequence contains multiple data segments. For example... Figure 2 As shown, solenoid valve 1 receives a communication data sequence {data segment 1, data segment 2, ..., data segment n, ..., data segment m} from the host computer;

[0029] The data interception module intercepts the first data segment in the received communication data sequence, and the intercepted data segment is used to control the coil of the solenoid valve itself.

[0030] The data forwarding module forwards the remaining communication data sequence after it has been intercepted by the current solenoid valve to the subsequent solenoid valve through the sending circuit and output interface, thereby realizing the cascading of solenoid valves. Figure 2 As shown, solenoid valve 1 intercepts data segment 1 in the communication data sequence and forwards the remaining communication data sequence {data segment 2, ..., data segment n, ..., data segment m} to solenoid valve 2; similarly, solenoid valve 2 intercepts data segment 2 in the communication data sequence and forwards the remaining communication data sequence {data segment n, ..., data segment m} to solenoid valve n.

[0031] Furthermore, such as Figure 3 As shown in the schematic diagram of the circuit board of this utility model, it includes a control chip U1, an input interface CN1 and an output interface CN2, first resistors R1 to seventh resistors R7, transistor Q1, first capacitor C1, second capacitor C2, first diodes D1 to fifth diodes D5, and Zener diode Z1.

[0032] Pin 2 / RxD of control chip U1 is connected to one end of the first capacitor C1, one end of the second resistor R2, the positive terminal of the first diode D1, the negative terminal of the second diode D2, and one end of the first resistor R1; the other end of the first resistor R1 is connected to the third communication signal pin Din of input interface CN1; the positive terminal of the second diode D2, the other end of the second resistor R2, and the other end of the first capacitor C1 are grounded respectively.

[0033] Furthermore, pin 14 (COIL) of control chip U1 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7 and the base of transistor Q1; the other end of the seventh resistor R7 and the emitter of transistor Q1 are grounded. The collector of transistor Q1 and the anode of the fifth diode D5 are connected to one end of the solenoid valve coil, and the cathode of the fifth diode D5 is connected to the other port of the solenoid valve coil, which is also connected to a 24V power supply.

[0034] In this invention, pin 1 / TxD of the control chip U1 is connected to one end of the fourth resistor R4, the positive terminal of the third diode D3, the negative terminal of the fourth diode D4, and one end of the fifth resistor R5. The negative terminal of the third diode D3 is connected to a 3.3V power supply, the positive terminal of the fourth diode D4 and the other end of the fourth resistor R4 are respectively grounded, and the other end of the fifth resistor R5 is connected to the communication output pin 3 Dout of the output interface CN2.

[0035] Pin 1 of input interface CN1 is directly connected to pin 1 of output interface CN2 as a 24V power supply; pin 2 of input interface CN1 is directly connected to pin 2 of output interface CN2 as ground; one end of the third resistor R3 is connected to the 24V power supply, and the other end of the third resistor R3, the negative terminal of Zener diode Z1, and one end of the second capacitor C2 are connected as an internal 3.3V power supply; the positive terminal of Zener diode Z1 and the other end of the second capacitor C2 are connected to ground respectively.

[0036] Furthermore, the circuit principle of this utility model is implemented as follows:

[0037] A 24V power supply is connected to the input interface CN1. A linear voltage regulator circuit consisting of the third resistor R3, the Zener diode Z1, and the second capacitor C2 provides a 3.3V power supply to the control chip. The Zener diode Z1 is selected with a 3.3V voltage regulation value.

[0038] Input interface CN1 connects to the output interface of the preceding solenoid valve or to a host computer. The communication signal originates from pin 3 (Din) of CN1, is divided by resistors R1 and R2, clamped by resistors D1 and D2, and filtered by resistors R1 and capacitors C1 before being sent as the input signal / RxD to pin 2 (RxD) of U1. R1, D1, and D2 are used to protect pin 2 (RxD) of the control chip U1 from accidental damage.

[0039] The forwarded data is output from pin 1 ( / TxD) of U1 to the subsequent solenoid valve via resistor R5. Resistor R5 limits the output current, while diodes D3 and D4 protect pin 1 ( / TxD) of the control chip U1 from accidental damage.

[0040] When implementing the UART format, the control chip U1 should be a chip with a UART interface; when using the return-to-zero code communication format, only a timer is needed to identify the logic 0 or 1 expressed by the time width of the communication pulse.

[0041] The control chip U1 is the MM32F0040B1 product of Shanghai Lingdong Microelectronics Co., Ltd.

[0042] Simultaneously, each solenoid valve naturally obtains the data segment corresponding to its cascade position from the data sequence sent by the host computer, without needing to assign communication addresses to each solenoid valve. It is also not limited by a specific number, thus achieving free cascading.

[0043] This invention enables the cascading of various solenoid valves through the input and output interfaces on the circuit board. Specifically, a non-directly connected communication signal line is provided in both the input and output interfaces, along with a directly connected power supply line; that is, a pair of directly connected power supply lines are provided in both the input and output interfaces.

[0044] Furthermore, the communication signals of each solenoid valve are cascaded in a non-directly connected manner through the input interface, control chip, and output interface.

[0045] Furthermore, there is no specific limit to the number of solenoid valves participating in the cascade in this utility model;

[0046] Furthermore, in this invention, the solenoid valves participating in the cascade do not need to be programmed with communication addresses. They only use a single communication signal line to transmit data in UART format or return-to-zero code format, without the need for synchronization clock, enable, or latch signals.

[0047] Furthermore, to improve reliability, differential transmission can be used for communication signals.

[0048] Furthermore, when the number of data segments sent by the host computer exceeds the actual number of cascaded solenoid valves, the excess data segments will be forwarded and discarded by the last solenoid valve. Conversely, when the number of data segments sent by the host computer is less than the actual number of cascaded solenoid valves, the solenoid valves at the later stages of the cascade will remain unchanged because they cannot obtain valid data segments.

[0049] Therefore, the number of data transmission segments in this invention need not be strictly equal to the number of cascaded solenoid valves.

[0050] Finally, it should be noted that the purpose of disclosing the embodiments is to help further understand this utility model. However, those skilled in the art will understand that various substitutions and modifications are possible without departing from the spirit and scope of this utility model and the appended claims. Therefore, this utility model should not be limited to the content disclosed in the embodiments, and the scope of protection of this utility model is defined by the scope of the claims.

Claims

1. A solenoid valve free cascade control device without address code, characterized by One circuit board is arranged for one electromagnetic valve, and a control chip, an input interface, an output interface, a receiving circuit and a sending circuit are arranged on the circuit board; the control chip is internally provided with a data receiving module, a data intercepting module and a data forwarding module; The data receiving module receives communication data from a previous adjacent electromagnetic valve or an upper computer through the input interface and the receiving circuit; The data intercepting module intercepts a first data segment in the received communication data sequence, and the intercepted data segment is used to control a coil of the electromagnetic valve; The data forwarding module forwards the communication data sequence remaining after the interception of the current electromagnetic valve to a subsequent electromagnetic valve through the output interface, thereby realizing communication cascading of multiple electromagnetic valves.

2. The free cascade control device of the solenoid valve without address code according to claim 1, characterized in that, The device further comprises a coil driving circuit which drives the coil of the electromagnetic valve according to the content of the intercepted data segment.

3. The free cascade control device of the solenoid valve without address code according to claim 1, characterized in that, The communication data sequence comprises multiple data segments.

4. The free cascade control device of the solenoid valve without address code according to claim 1, characterized in that, The input interface and the output interface in the circuit board are used to realize the cascading between the electromagnetic valves, one non-directly connected communication signal line is arranged in each of the input interface and the output interface, and one pair of directly connected power lines are arranged in the input interface and the output interface.

5. The free cascade control device of the solenoid valve without address code according to claim 1, characterized in that, The communication signal line of each electromagnetic valve is cascaded in a non-directly connected manner through the input interface, the control chip and the output interface.

6. The free cascade control device of the solenoid valve without address code according to claim 1, characterized in that, The electromagnetic valves participating in the cascading do not need to arrange communication addresses, and are transmitted in a single end manner in a UART format or a zero code format through one communication signal line, without a synchronous clock, an enable signal and a latch signal.

7. The free cascading control device for solenoid valves without address code according to claim 1, wherein The circuit board comprises a control chip U1, an input interface CN1 and an output interface CN2, first to seventh resistors R1-R7, a transistor Q1, first and second capacitors C1 and C2, first to fifth diodes D1-D5 and a stabilizing diode Z1; The second pin / RxD of the control chip U1 is connected with one end of the first capacitor C1, one end of the second resistor R2, the positive electrode of the first diode D1, the negative electrode of the second diode D2 and one end of the first resistor R1; the other end of the first resistor R1 is connected with the No. 3 communication signal pin Din of the input interface CN1; the positive electrode of the second diode D2, the other end of the second resistor R2 and the other end of the first capacitor C1 are grounded respectively; The 14th pin COIL of the control chip U1 is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected with one end of the seventh resistor R7 and the base of the transistor Q1; the other end of the seventh resistor R7 and the emitter of the transistor Q1 are grounded; the collector of the transistor Q1 and the positive electrode of the fifth diode D5 are connected with one end of the coil of the electromagnetic valve, the negative electrode of the fifth diode D5 is connected with the other port of the coil of the electromagnetic valve, and the other port is connected with a 24V power supply; The first pin / TxD of the control chip U1 is connected with one end of the fourth resistor R4, the positive electrode of the third diode D3, the negative electrode of the fourth diode D4 and one end of the fifth resistor R5; the negative electrode of the third diode D3 is connected with a 3.3V power supply, the positive electrode of the fourth diode D4 and the other end of the fourth resistor R4 are grounded respectively, and the other end of the fifth resistor R5 is connected with the communication output No. 3 pin Dout of the output interface CN2; The No.1 pin of the input interface CN1 is directly connected with the No.1 pin of the output interface CN2; the No.2 pin of the input interface CN1 is directly connected with the No.2 pin of the output interface CN2 as ground; one end of the third resistor R3 is connected with a 24V power supply, the other end of the third resistor R3, the negative pole of the voltage stabilizing diode Z1 and one end of the second capacitor C2 are connected as an internal power supply 3.3V; the positive pole of the voltage stabilizing diode Z1 and the other end of the second capacitor C2 are respectively connected to the ground.

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