Proportional valve driving detection circuit

Abstract

The utility model discloses a proportional valve driving detection circuit which comprises a driving chip MCU, the driving chip MCU comprises a PWM output end and an AD sampling end, the PWM output end is connected with a load switch Q1, the output end of the load switch Q1 is connected with the L input end of a proportional valve and an operational amplifier chip U2, the output end of the operational amplifier chip U2 is connected with the AD sampling end, the H output end of the driving chip MCU is connected with a load chip U1, and the output end of the load chip U1 is connected with the AD sampling end. The output end of the load chip U1 is connected with the H input end of the proportional valve, the H input end of the proportional valve is connected with the voltage division filter circuit, the voltage division filter circuit is connected with the AD sampling end, and the AD sampling end is connected with the current output end of the load chip U1. According to the utility model, through real-time sampling of current and feedback of control current output by the PWM output end, the output control current can be conveniently adjusted, closed-loop control is realized, the adjustment precision is improved, and through sampling of voltage, the current is further verified and fed back.

Description

Technical Field

[0001] The utility model belongs to the technical field of proportional valve control circuits and relates to a proportional valve drive detection circuit. Background Art

[0002] A proportional valve is a hydraulic valve that converts an input electrical signal into proportional force or displacement, thereby continuously controlling parameters such as pressure and flow. Proportional valves are typically controlled by adjusting the parameters through the voltage or current output of a PWM driver chip. However, during actual adjustment, the drive signal output by the PWM driver chip fluctuates, or is affected by external factors, which can affect the accuracy of proportional valve regulation. Utility Model Content

[0003] In view of the above problems, the present invention proposes a proportional valve drive detection circuit, which effectively solves the problems in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0005] A proportional valve drive detection circuit includes a driver chip MCU, the driver chip MCU includes a PWM output end and an AD sampling end, the PWM output end is connected to a load switch Q1, the output end of the load switch Q1 is connected to the L input end of the proportional valve and an operational amplifier chip U2, the output end of the operational amplifier chip U2 is connected to the AD sampling end, the H output end of the driver chip MCU is connected to a load chip U1, the output end of the load chip U1 is connected to the H input end of the proportional valve, the H input end of the proportional valve is connected to a voltage divider filter circuit, the voltage divider filter circuit is connected to the AD sampling end, and the AD sampling end is connected to the current output end of the load chip U1.

[0006] Optionally, the voltage divider filter circuit includes a resistor R11, a resistor R12 and a capacitor C6 respectively connected to the AD sampling terminal, the resistor R12 and the capacitor C6 are grounded, and the resistor R11 is connected to the H input terminal of the proportional valve.

[0007] Optionally, a diode D3 is connected in series between the load switch Q1 and the L input terminal of the proportional valve, a diode D1 is connected in series to the L input terminal of the proportional valve, the diode D1 is connected to the VBAT terminal of the driver chip MCU, and a diode D4 and a capacitor C2 are connected in parallel to the H input terminal of the proportional valve, and the parallel circuit of the diode D4 and the capacitor C2 is connected to the protective ground terminal.

[0008] Optionally, the current output end of the load chip U1 and the output end and input end of the operational amplifier chip U2 are respectively provided with a clamping protection diode D2, a diode D7 and a diode D6.

[0009] Compared with the existing technology, the present invention has the following beneficial effects: by real-time sampling of current, the control current output by the PWM output end is fed back, which facilitates the adjustment of the output control current, realizes closed-loop control, and improves the adjustment accuracy. At the same time, by sampling the voltage, the current is further verified and fed back. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a wiring diagram of the load chip U1 according to an embodiment of the present utility model;

[0011] Figure 2 This is a wiring diagram of the operational amplifier chip U2 of the embodiment of the present utility model;

[0012] Figure 3 It is a wiring diagram of the voltage divider filter circuit of the embodiment of the present utility model. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] See also Figure 1-3 , a proportional valve drive detection circuit disclosed in an embodiment of the utility model includes a driver chip MCU, the driver chip MCU includes a PWM output end and an AD sampling end, the PWM output end is connected to a load switch Q1, the output end of the load switch Q1 is connected to the L input end of the proportional valve and the operational amplifier chip U2, the output end of the operational amplifier chip U2 is connected to the AD sampling end, the H output end of the driver chip MCU is connected to the load chip U1, the output end of the load chip U1 is connected to the H input end of the proportional valve, the H input end of the proportional valve is connected to a voltage divider filter circuit, the voltage divider filter circuit is connected to the AD sampling end, and the AD sampling end is connected to the current output end of the load chip U1.

[0015] Specifically, an AD sampling terminal is set on the driver chip MCU. When the PWM output terminal outputs the control current, the voltage and current of the circuit are sampled through the AD sampling terminal of the driver chip MCU.

[0016] In this way, by real-time sampling of the current, the control current output from the PWM output end is fed back, which facilitates the adjustment of the output control current, realizes closed-loop control, and improves the adjustment accuracy. At the same time, by sampling the voltage, the current is further verified and fed back.

[0017] In some feasible implementations, the driver chip MCU can be selected as SPC560C50L3C6E0Y, the load switch Q1 can be selected as VND5N07TR-E, the load chip U1 can be selected as BTF6070-2ERV, and the op amp chip U2 can be selected as INA213-Q1.

[0018] Combined with attachment Figure 1-3 The proportional valve terminal CN1 includes two input terminals, H and L. When the driver chip MCU pin MCU_O1_H outputs a high level, the load chip U1 pins 12, 13, and 14 output a high level to the proportional valve H input terminal. At this time, the driver chip MCU pin MCU_O1_PWM, that is, the PWM output terminal outputs a high level, the load chip U1 pins 2 and 3 are turned on, and the proportional valve works at this time; the driver chip MCU pin MCU_O1_PWM outputs a low level, U1 pins 2 and 3 are disconnected, and the proportional valve does not work at this time. The MCU pin MCU_O1_PWM outputs a changing PWM signal, and the proportional valve works accordingly according to the input PWM signal.

[0019] The output voltage O1_H of the H input terminal enters the AD sampling terminal of the driver chip MCU through aDin03 for sampling, and the voltage of O1_H is calculated; when O1_H outputs a high level, aDin01 samples the current flowing through the proportional valve; when the driver chip MCU pin MCU_O1_PWM outputs a high level, the voltage and current signals flowing through the resistor R9 are sampled, amplified, shaped and filtered by the operational amplifier chip U2, and then enter the AD sampling terminal of the driver chip MCU through aDin02 for sampling, and the current passing through the proportional valve is calculated. By sampling current and voltage at multiple positions, closed-loop control and mutual verification are realized, effectively improving the accuracy and stability of proportional valve control.

[0020] As a specific implementation of a proportional valve drive detection circuit provided in the application, the voltage divider filter circuit includes a resistor R11, a resistor R12 and a capacitor C6 respectively connected to the AD sampling end, the resistor R12 and the capacitor C6 are grounded, and the resistor R11 is connected to the H input end of the proportional valve.

[0021] In general, the output voltage O1_H is divided and filtered by the resistors R11 and R12 to improve the sampling resolution.

[0022] As another specific implementation of a proportional valve drive detection circuit provided in the application, a diode D3 is connected in series between the load switch Q1 and the L input terminal of the proportional valve, a diode D1 is connected in series to the L input terminal of the proportional valve, the diode D1 is connected to the VBAT terminal of the driver chip MCU, and a diode D4 and a capacitor C2 are connected in parallel in series to the H input terminal of the proportional valve, and the parallel circuit of the diode D4 and the capacitor C2 is connected to the protective ground terminal.

[0023] Combined with attachment Figure 1-3 The diodes D1, D4 and D3 are used to respectively form clamping protection, freewheeling protection and reverse connection protection for the load chip U1 at the periphery of the load chip U1, thereby protecting the operation of the load chip U1 and improving the stability of the circuit operation.

[0024] As another specific implementation of a proportional valve drive detection circuit provided in the application, the current output end of the load chip U1 and the output and input ends of the operational amplifier chip U2 are respectively provided with a clamping protection diode D2, a diode D7 and a diode D6.

[0025] It should be understood that by providing the diode D2 , the diode D7 and the diode D6 , clamping protection is formed for the sampling detection circuit, thereby reducing the possibility of damage to components on the circuit.

[0026] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A proportional valve drive detection circuit, comprising a driver chip MCU, wherein the driver chip MCU includes a PWM output terminal, and is characterized in that: The driver chip MCU also includes an AD sampling end, the PWM output end is connected to a load switch Q1, the output end of the load switch Q1 is connected to the L input end of the proportional valve and the operational amplifier chip U2, the output end of the operational amplifier chip U2 is connected to the AD sampling end, the H output end of the driver chip MCU is connected to the load chip U1, the output end of the load chip U1 is connected to the H input end of the proportional valve, the H input end of the proportional valve is connected to a voltage divider filter circuit, the voltage divider filter circuit is connected to the AD sampling end, and the AD sampling end is connected to the current output end of the load chip U1.

2. A proportional valve drive detection circuit according to claim 1, characterized in that: The voltage divider filter circuit includes a resistor R11, a resistor R12 and a capacitor C6 respectively connected to the AD sampling terminal. The resistor R12 and the capacitor C6 are grounded. The resistor R11 is connected to the H input terminal of the proportional valve.

3. The proportional valve drive detection circuit according to claim 1, characterized in that: A diode D3 is connected in series between the load switch Q1 and the L input terminal of the proportional valve. The L input terminal of the proportional valve is connected in series with a diode D1, and the diode D1 is connected to the VBAT terminal of the driver chip MCU. The H input terminal of the proportional valve is connected in series with a diode D4 and a capacitor C2 connected in parallel. The parallel circuit of the diode D4 and the capacitor C2 is connected to the protective ground terminal.

4. A proportional valve drive detection circuit according to claim 1, characterized in that: The current output end of the load chip U1 and the output end and input end of the operational amplifier chip U2 are respectively provided with a clamping protection diode D2, a diode D7 and a diode D6.

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