A digital high-speed electromagnetic on-off valve drive controller

Abstract

The application discloses a digital high-speed electromagnetic switch valve driving controller, which comprises a driving chip set for amplifying an input weak electric signal into a strong electric signal and a level conversion chip set for controlling input, wherein the driving chip set comprises a first driving chip, a second driving chip, a third driving chip and a fourth driving chip; and the level conversion chip set comprises a first level conversion chip and a second level conversion chip. The power voltage is controlled by the added level conversion chip set to drive the high-speed electromagnetic switch valve to act, the accurate control of the effective power of the PWM signal is realized, the influence of the inductance of the high-speed electromagnetic switch valve coil is effectively reduced, and therefore the dynamic response and the control precision of the high-speed electromagnetic switch valve are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of digital control, in particular to a digital high-speed electromagnetic on-off valve driving controller. BACKGROUND

[0002] As a new type of fluid control element of digital control, high-speed electromagnetic on-off valve has the advantages of simple structure, good process, low cost and strong anti-pollution ability compared with servo valve and proportional valve, and gradually becomes an important member of digital hydraulic.

[0003] High-speed electromagnetic on-off valve is mainly controlled and adjusted by pulse frequency or pulse width, and the modulation methods of control signal mainly include pulse width modulation (PWM), pulse amplitude modulation (PAM), pulse code modulation (PCM), pulse frequency modulation (PFM) and pulse number modulation (PNM), and the pulse width modulation (PWM) is widely used at present.

[0004] Since the PWM signal will produce a certain inductive effect when passing through the electromagnetic coil of the high-speed electromagnetic on-off valve, the higher the PWM frequency, the greater the inductive effect, which reduces the effective power of the PWM signal, reduces the control accuracy and reduces the dynamic response of the high-speed electromagnetic on-off valve. SUMMARY

[0005] Therefore, the present application provides a digital high-speed electromagnetic on-off valve driving controller, which aims to solve the technical problem of how to improve the dynamic response and control accuracy of the high-speed electromagnetic on-off valve.

[0006] To solve the above technical problems, the technical scheme of the present application provides a digital high-speed electromagnetic on-off valve driving controller, which includes a driving chip set for amplifying the input weak electric signal into a strong electric signal and a level conversion chip set for controlling the input, the driving chip set includes a first driving chip, a second driving chip, a third driving chip and a fourth driving chip, and the level conversion chip set includes a first level conversion chip and a second level conversion chip.

[0007] Optionally, the first driving chip and the second driving chip are both input controlled through the first level conversion chip, and the third driving chip and the fourth driving chip are both input controlled through the second level conversion chip.

[0008] Optionally, the first level conversion chip and the second level conversion chip both include a first channel and a second channel.

[0009] Optionally, the first channel and the second channel both include a first port and a second port, and the first port and the second port of the first channel are connected to two control input ports of the first driving chip, and the first port and the second port of the second channel are connected to two control input ports of the second driving chip.

[0010] Optionally, the control output ports of the first and second driving chips are connected to the coil of the first high-speed electromagnetic switch valve, and the control output ports of the third and fourth driving chips are connected to the coil of the second high-speed electromagnetic switch valve.

[0011] Optionally, the coil of the high-speed electromagnetic switch valve is not polarized when connected.

[0012] Optionally, the power supply ground wire of the driving chip set is in communication with the power supply ground wire of the level conversion chip set.

[0013] The application provides a digital high-speed electromagnetic switch valve driving controller, which comprises a driving chip set for amplifying a weak input signal into a strong signal and a level conversion chip set for controlling input, wherein the driving chip set comprises a first driving chip, a second driving chip, a third driving chip and a fourth driving chip, and the level conversion chip set comprises a first level conversion chip and a second level conversion chip. The power voltage is controlled by the added level conversion chip set to drive the high-speed electromagnetic switch valve to act, so that the effective power of the PWM signal is accurately controlled, the influence of the inductance of the coil of the high-speed electromagnetic switch valve is effectively reduced, and the dynamic response and control precision of the high-speed electromagnetic switch valve are improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 is an electrical schematic diagram of a digital high-speed electromagnetic switch valve driving controller provided by an embodiment of the present application;

[0016] Figure 2 is a control panel interface schematic diagram provided by an embodiment of the present application;

[0017] Figure 3 is a program flow schematic diagram provided by an embodiment of the present application;

[0018] Figure 4 is a schematic diagram of an upper computer control software interface provided by an embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the person skilled in the art better understand the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the present application.

[0020] Referring to Figure 1 It is an electrical schematic diagram of a digital high-speed electromagnetic on-off valve driving controller provided by an embodiment of the present application.

[0021] A digital high-speed electromagnetic on-off valve driving controller, comprising a driving chip set for amplifying an input weak electric signal into a strong electric signal and a level conversion chip set for controlling input, the driving chip set comprising a first driving chip V1, a second driving chip V2, a third driving chip V3 and a fourth driving chip V4; the level conversion chip set comprising a first level conversion chip U3 and a second level conversion chip U5.

[0022] The first driving chip and the second driving chip are both input-controlled through the first level conversion chip, and the third driving chip and the fourth driving chip are both input-controlled through the second level conversion chip.

[0023] As shown in Figure 2 The level conversion chip set comprises two channels, and each channel comprises two ports. The coil of the high-speed electromagnetic on-off valve is connected to the A1 port and the A2 port of the first channel, or the coil of the high-speed electromagnetic on-off valve is connected to the B1 port and the B2 port of the second channel. The connection is not polar, and the H-bridge circuit of the high-speed electromagnetic on-off valve is obtained at this time.

[0024] It should be noted that the H-bridge is an electronic circuit that can reverse the voltage / current of the load or output connected to it. Such circuits can be used for forward / reverse control and speed control of DC motors in robots and other applications, stepper motor control (bipolar stepper motors also require a motor controller that includes two H-bridge circuits), most DC-AC converters in power conversion (such as inverters and frequency converters), some DC-DC converters (push-pull converters), and other power electronic devices. The H-bridge is a typical DC motor control circuit, and is named "H-bridge" because its circuit shape resembles the letter H. The four vertical legs of the H are composed of four transistors, and the motor is the horizontal bar in the H. The H-bridge circuit can be built in discrete components or integrated into an integrated circuit. The name "H-bridge" originates from its circuit, with two parallel branches and a load connected to the circuit output branch, forming a circuit structure resembling the letter "H".

[0025] Further, the power supply circuit is divided into a power supply interface and a control power supply interface. The power supply interface mainly provides DC power required by the high-speed electromagnetic on-off valve during operation, and the power supply range is adjusted based on the parameters of the coil of the high-speed electromagnetic on-off valve. The control power supply interface is a 5V DC interface, which is responsible for supplying the control module circuit on the board. The externally input 5V voltage is directly supplied to the control side of the drive chip and the output side circuit of the level conversion chip on the board. At the same time, the voltage is supplied to the single-chip microcomputer module, the input side of the level conversion chip, and the RS232 communication circuit after being reduced by the LDO on the board. The control power supply requires a stable voltage source. The ground of the power supply in the circuit is connected to the ground of the control power supply.

[0026] It should be noted that LDO is a linear voltage regulator that uses a transistor or field effect transistor (FET) operating in its saturation region to subtract excess voltage from the input voltage of the application to produce an adjusted output voltage. The so-called dropout voltage is the minimum difference between the input and output voltages required by the voltage regulator to maintain the output voltage within 100mV of its rated value. The LDO (low dropout) voltage regulator with positive output voltage usually uses a power transistor (also known as a transfer device) as a PNP. This transistor allows saturation, so the voltage regulator can have a very low dropout voltage, usually around 200mV; in comparison, a traditional linear voltage regulator using an NPN composite power transistor has a dropout voltage of about 2V. The LDO with negative output uses an NPN as its transfer device, which operates similarly to the PNP device of the LDO with positive output.

[0027] Further, in combination with the program flow diagram shown in Figure 3 , the control program part is described. After the program part is powered on, the initialization of each port of the single-chip microcomputer is performed first. Then, the instruction information sent by the host computer is received through the RS232 communication interface. The instruction information is parsed to enter the control instruction control flow (state machine). According to the frequency, pulse width, and other parameters of the instruction, each state is switched to control the on-off of the power tubes of the H-bridge to drive the high-speed electromagnetic on-off valve to act. Specifically, as shown in Figure 4 , the instruction parameters are input in the host computer control software page and sent to the control board through the RS232 communication interface. The control board calculates the pulse frequency and the positive voltage time, reverse voltage time, and zero voltage holding time of the pulse according to the control instruction. The state machine is used to switch each instruction state in turn to control the on-off of the power tubes of the H-bridge to drive the high-speed electromagnetic on-off valve to act.

[0028] The embodiment provides a digital high-speed electromagnetic switch valve driving controller, which comprises a driving chip set for amplifying an input weak electric signal into a strong electric signal and a level conversion chip set for controlling an input level, the driving chip set comprises a first driving chip, a second driving chip, a third driving chip and a fourth driving chip, and the level conversion chip set comprises a first level conversion chip and a second level conversion chip. The level conversion chip set is additionally arranged to control a power supply voltage, so as to drive the high-speed electromagnetic switch valve to act, to realize accurate control on effective power of a PWM signal, to reduce the influence of dynamic response of the high-speed electromagnetic switch valve, and to achieve the purpose of reducing the influence of electromagnetic coil inductance.

[0029] It should be noted that, in this document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or system. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or system including the element.

[0030] The above is only the preferred embodiment of the present application, and it should be pointed out that the above preferred embodiment should not be regarded as a limitation of the present application, and the protection scope of the present application should be limited by the scope defined by the claims. For ordinary skilled in the art, several improvements and refinements can be made without departing from the spirit and scope of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A digital high-speed electromagnetic on-off valve drive controller characterized by comprising: The driving chip set for amplifying the input weak electric signal into a strong electric signal and the level conversion chip set for controlling the input level conversion chip set, the driving chip set includes a first driving chip, a second driving chip, a third driving chip and a fourth driving chip; the level conversion chip set includes a first level conversion chip and a second level conversion chip; Wherein, the first level conversion chip and the second level conversion chip each contain a first channel and a second channel, and each channel contains two ports, the coil of the high-speed electromagnetic switch valve is connected to the two ports of the first channel or the two ports of the second channel, and the connection is not polarized, obtaining the H-bridge circuit of the high-speed electromagnetic switch valve. Wherein, the control output port of the first driving chip and the second driving chip is connected to the coil of the first high-speed electromagnetic switch valve, and the control output port of the third driving chip and the fourth driving chip is connected to the coil of the second high-speed electromagnetic switch valve.

2. A digital high-speed electromagnetic on-off valve drive controller according to claim 1, wherein The first driving chip and the second driving chip are controlled by the first level conversion chip; the third driving chip and the fourth driving chip are controlled by the second level conversion chip.

3. A digital high-speed electromagnetic on-off valve drive controller according to claim 2, wherein The first channel and the second channel each contain a first port and a second port, and the first port and the second port of the first channel are connected to the two control input ports of the first driving chip, and the first port and the second port of the second channel are connected to the two control input ports of the second driving chip.

4. The digital high-speed electromagnetic on-off valve drive controller according to claim 1, wherein The power ground wire of the driving chip set is in communication with the power ground wire of the level conversion chip set.

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