High-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function

Abstract

The utility model discloses a kind of high-frequency pulse control circuit with overcurrent overheat protection and self-recovery function, belong to solenoid valve control field. Including power processing module, main control module, signal conversion module, load driving module, power control module, power processing module, main control module, signal conversion module, load driving module, power control module are sequentially connected, signal conversion module, load driving module, power control module are connected with power processing module;Power control module is electrically connected with main control module. After main control module generates high-frequency PWM electric pulse signal, high-low level conversion is realized through signal conversion module, then output to the coil of solenoid valve, coil energization generates magnetic field, control valve core action, realize the opening and closing of solenoid valve, to be able to stably output high-frequency PWM electric pulse signal, realize the stable control to gas source;Power processing module can increase internal resistance to carry out current-limiting protection when current is too large, avoid damaging solenoid valve.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valves, and specifically relates to a high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function. Background Technology

[0002] Hot melt adhesives, polyurethane adhesives, epoxy resins, and other fluids require spray valves during spraying to ensure uniform and precise application to the desired surface. The viscosity and properties of these fluids necessitate high-performance spraying equipment. A significant portion of existing spray valves are pneumatic valves, driven by air pressure. These valves typically use compressed air as a power source, relying on changes in gas pressure to open and close the valve, thereby controlling the adhesive spraying and flow rate.

[0003] However, to achieve stable fluid spraying, especially in high-precision and high-frequency applications, relying solely on pneumatic valve air supply regulation is insufficient. Stable air supply control not only affects the spraying effect but also directly impacts production efficiency and product quality. Therefore, it is essential to stably control the air supply to the pneumatic valve to ensure that each spray achieves the desired results.

[0004] Solenoid valves, as a common and effective air source control device, have the advantages of fast response speed and high control accuracy, and are widely used in many fields. Applying them to pneumatic valves can significantly improve the overall performance of a spraying system. However, how to design its control circuit so that the solenoid valve can stably output high-frequency electrical pulse signals to control the air source of the pneumatic valve is a technical problem that urgently needs to be solved in the current technology.

[0005] Based on this, prior art with application number 202422739096.5 discloses a high-frequency pulse solenoid valve control circuit, including a power processing module, a main control module, a signal conversion module, a load drive module, and a power control module. These modules are connected sequentially, with the signal conversion module, load drive module, and power control module connected to the power processing module. The power control module is electrically connected to the main control module. After the main control module generates a high-frequency PWM electrical pulse signal, it performs high-low level conversion through the signal conversion module and then outputs it to the coil of the solenoid valve. When the coil is energized, it generates a magnetic field, controlling the valve core to move and thus opening and closing the solenoid valve, thereby achieving stable control of the gas source. However, the high-frequency solenoid valve control circuit disclosed in the above patent lacks overcurrent protection; when the current is too high, the solenoid valve is easily damaged. Utility Model Content

[0006] To address the aforementioned problems, the purpose of this utility model is to provide a high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function. When the current is too high, it can increase the internal resistance to limit the current and prevent damage to the solenoid valve. When the current is normal, it can automatically restore the current flow.

[0007] Another objective of this invention is to provide a high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function. When the current is too high, it can also display an indicator light to remind the user, so that the user can adjust the input current in time.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows:

[0009] This utility model provides a high-frequency pulse solenoid valve control circuit, including:

[0010] The power processing module performs overcurrent and overtemperature detection processing on the input power signal;

[0011] The main control module is used to output high-frequency PWM electrical pulse signals;

[0012] The signal conversion module is used for converting between positive and negative levels of high-frequency PWM electrical pulse signals;

[0013] The load drive module is used to control the magnetic field of the coil and drive the valve body of the solenoid valve to work.

[0014] The power control module is used to control the power of the PWM electrical pulse signal;

[0015] The power processing module includes diodes DB1 and DB2, a thermistor PT1, an inductor L1, transistors Q1 and Q2, and an overcurrent indicator LED2. One end of the thermistor PT1 is connected to the DC input power signal, and the other end is connected to pin 3 of diode DB1. The two ends of the thermistor PT1 are connected to pins 3 and 4 of diode DB2, respectively. The two ends of the overcurrent indicator LED2 are connected to pins 1 and 2 of diode DB2, respectively. The main control module and inductor L1 are both connected to diode DB1. Transistors Q1 and Q2 are connected in parallel to diode DB1. The signal conversion module and power control module are both electrically connected to inductor L1. Transistor Q1 is electrically connected to the power control module, and transistor Q2 is electrically connected to the load drive module.

[0016] Furthermore, the main control module includes a main control chip U3 and a filter capacitor C1. The filter capacitor C1 is connected to an externally input DC power signal, and the main control chip U3 is electrically connected to a diode DB through the filter capacitor C1. The signal conversion module and the power control module are electrically connected to the main control chip U3. The filter capacitor C1 filters the external DC voltage signal before supplying it to the main control chip U3. The main control chip U3 uses a PWM chip and outputs a high-frequency PWM electrical pulse signal to the signal conversion module for level conversion, which is then used by the subsequent load drive module.

[0017] Furthermore, the main control chip U3 is model TL5001C, manufactured by Texas Instruments.

[0018] Furthermore, the signal conversion module includes a composite transistor U1, which is electrically connected to the main control chip U3, inductor L1, and load drive module. After receiving the high-frequency PWM pulse signal output by the main control chip U3, the composite transistor U1 performs level conversion for use by the subsequent load drive module.

[0019] Furthermore, the load drive module includes a load drive chip U2, an inductor L2, a resistor R6, a Zener diode D5, and a Zener diode D6. The load drive chip U2 is electrically connected to the composite transistor U1. The inductor L2, Zener diode D5, and Zener diode D6 are all electrically connected to the load drive chip U2. The resistor R6 and the power control module are electrically connected to the inductor L2. The load drive chip U2 is also electrically connected to the transistor Q2.

[0020] Furthermore, the FDS4559 of the load driver chip U2 is manufactured by On Semiconductor.

[0021] Furthermore, the power control module includes a power control chip U4, which is electrically connected to the inductor L1, the main control chip U3, the resistor R6, the inductor L2, and the transistor Q1. After the resistor R6 acquires the operating power of the load drive module, it feeds it back to the power control chip U4. The power control chip U4 compares the operating power with a preset power and feeds the comparison result back to the main control chip U3. The main control chip U3 then adjusts the output power of the input PWM signal.

[0022] Furthermore, the power control chip U4 is model TS321ILT and is manufactured by STMicroelectronics.

[0023] Compared with existing technologies, the power processing module of this invention processes the input power signal, filters out interference signals, and then supplies it to the main control module, signal conversion module, and load drive module. The main control module generates a high-frequency PWM electrical pulse signal, which is then converted from high to low level by the signal conversion module and output to the coil of the solenoid valve. When the coil is energized, it generates a magnetic field, controlling the valve core to open and close the solenoid valve. The power control module obtains the output power of the load drive module, compares it with a preset power, and feeds the comparison result back to the main control module. The main control module adjusts the output power of the PWM signal, thereby stably outputting the high-frequency PWM electrical pulse signal and achieving stable control of the gas source. The power processing module can limit current by increasing internal resistance when the current is too high to prevent damage to the solenoid valve. When the current returns to normal, the PT1 temperature drops to the normal range, allowing current to flow, achieving self-recovery. Simultaneously, it can also display indicator lights to remind the user, facilitating timely adjustment of the input current. Attached Figure Description

[0024] Figure 1 This is the circuit schematic diagram of this embodiment.

[0025] Figure 2 This is the circuit schematic of the power processing module.

[0026] Figure 3 This is the circuit schematic of the main control module.

[0027] Figure 4 This is the circuit schematic of the signal conversion module.

[0028] Figure 5 This is the circuit schematic of the load drive module.

[0029] Figure 6 This is the circuit schematic of the power control module. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] To achieve the above objectives, the technical solution of this utility model is as follows:

[0032] See Figure 1-2 As shown, this embodiment provides a high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function, including:

[0033] The power processing module processes the input power signal for overcurrent, overtemperature, and detection.

[0034] The main control module is used to output high-frequency PWM electrical pulse signals;

[0035] The signal conversion module is used for converting between positive and negative levels of high-frequency PWM electrical pulse signals;

[0036] The load drive module is used to control the magnetic field of the coil and drive the valve body of the solenoid valve to work.

[0037] The power control module is used to control the power of the PWM electrical pulse signal;

[0038] The power processing module includes diodes DB1 and DB2, a thermistor PT1, an inductor L1, transistors Q1 and Q2, and an overcurrent indicator LED2. One end of the thermistor PT1 is connected to the DC input power signal, and the other end is connected to pin 3 of diode DB1. The two ends of the thermistor PT1 are connected to pins 3 and 4 of diode DB2, respectively. The two ends of the overcurrent indicator LED2 are connected to pins 1 and 2 of diode DB2, respectively. The main control module and inductor L1 are both connected to diode DB1. Transistors Q1 and Q2 are connected in parallel to diode DB1. The signal conversion module and power control module are both electrically connected to inductor L1. Transistor Q1 is electrically connected to the power control module, and transistor Q2 is electrically connected to the load drive module.

[0039] In this embodiment, the power processing module processes the input power signal, filters out interference signals, and then supplies it to the main control module, signal conversion module, and load drive module. After the main control module generates a high-frequency PWM electrical pulse signal, it converts the signal to a high or low level and then outputs it to the coil of the solenoid valve. When the coil is energized, it generates a magnetic field, which controls the valve core to move and realize the opening and closing of the solenoid valve. After the power control module obtains the output power of the load drive module, it compares it with the preset power and feeds the comparison result back to the main control module. The main control module adjusts the output power of the PWM signal, thereby stably outputting the high-frequency PWM electrical pulse signal and realizing stable control of the gas source.

[0040] When the input DC power signal current is greater than 0.5A, the thermistor PT1 will heat up faster, increasing its internal resistance and triggering current limiting protection. When the current returns to normal, the temperature of PT1 drops to the normal range, allowing current to flow and achieving self-recovery. When overcurrent protection is activated, the internal resistance of PT1 is high, and the current flows through diode DB2 into the overcurrent indicator LED2. LED2 emits blue light to remind the user, allowing the user to adjust the input current in a timely manner.

[0041] In this embodiment, an external 24V DC voltage signal is input. Part of it directly powers the main control module, while the other part passes through the thermistor PT1 and is rectified by diode DB1. After filtering and energy storage by inductor L1, the signal is supplied to the signal conversion module and power control module. Transistor Q1 can identify and monitor the operating level of the circuit; transistor Q2 can monitor whether there is power input in the circuit.

[0042] Further, see Figure 3 The main control module includes a main control chip U3 and a filter capacitor C1. The filter capacitor C1 is connected to an externally input DC power signal, and the main control chip U3 is electrically connected to a diode DB through the filter capacitor C1. The signal conversion module and the power control module are electrically connected to the main control chip U3. The filter capacitor C1 filters the external DC voltage signal before supplying it to the main control chip U3. The main control chip U3 uses a PWM chip and outputs a high-frequency PWM electrical pulse signal to the signal conversion module for level conversion, which is then used by the subsequent load drive module.

[0043] Furthermore, the main control chip U3 is model TL5001C, manufactured by Texas Instruments.

[0044] Further, see Figure 4 The signal conversion module includes a composite transistor U1, which is electrically connected to the main control chip U3, inductor L1, and load drive module. After receiving the high-frequency PWM electrical pulse signal output by the main control chip U3, the composite transistor U1 performs level conversion for use by the subsequent load drive module.

[0045] Further, see Figure 5 The load drive module includes a load drive chip U2, an inductor L2, a resistor R6, a Zener diode D5, and a Zener diode D6. The load drive chip U2 is electrically connected to the composite transistor U1. The inductor L2, Zener diode D5, and Zener diode D6 are all electrically connected to the load drive chip U2. The resistor R6 and the power control module are electrically connected to the inductor L2. The load drive chip U2 is also electrically connected to the transistor Q2.

[0046] Furthermore, the FDS4559 in the load driver chip U2 is manufactured by On Semiconductor. The FDS4559 is a dual MOSFET manufactured by On Semiconductor, a type of transistor. It is manufactured using advanced power trench technology and consists of two MOSFETs. Structurally, it is a discrete power transistor, containing complementary N-channel and P-channel transistors. With a withstand voltage of 60V, it can operate in high-voltage applications. Its continuous drain current can reach 4.5A, and its on-resistance is as low as 0.055 ohms, enabling it to provide high current with low voltage drop and low power consumption. It also has a low gate charge, resulting in fast switching speeds and enabling high-frequency operation. The device has a small input capacitance (Ciss), which helps reduce power consumption and response time in the drive circuit. These characteristics make the FDS4559 ideal for load drive circuits, effectively controlling the current flow of the load. For example, in a high-frequency pulse solenoid valve control circuit, the solenoid valve coil can be driven by controlling the on and off states of the FDS4559, thereby controlling the solenoid valve. It should be noted that the "load drive function" here does not refer to complex chip-level control logic (such as overcurrent protection, feedback regulation, etc.), but rather to its ability as a power switch to convert low-voltage control signals into high-power current to drive the load. The core function of the FDS4559 is to "execute switching actions" rather than "logic control," which is different from the chip's multi-functionality, but it fully meets the core requirement of the load drive module to "control the on / off state of the coil current."

[0047] In this embodiment, after receiving the high-frequency PWM electrical pulse signal converted by the composite transistor U1, the load drive chip U2 can quickly turn the auxiliary L2's electrical pulse signal on or off, controlling the magnetic field of the inductor coil and driving the solenoid valve body to work. When the inductor L2 is de-energized, the composite transistor U1, the load drive chip U2, the Zener diode D5, and the Zener diode D6 can quickly absorb the induced electromotive force after the inductor L2 loses its electrical signal, allowing the valve core to quickly reset elastically; the transistor Q2 can monitor whether there is a power input in the load drive module.

[0048] Further, see Figure 6 The power control module includes a power control chip U4, which is electrically connected to inductor L1, main control chip U3, resistor R6, inductor L2, and transistor Q1. Resistor R6 collects the operating power of the load drive module and feeds it back to the power control chip U4. The power control chip U4 compares the operating power with a preset power and feeds the comparison result back to the main control chip U3. The main control chip U3 then adjusts the output power of the input PWM signal.

[0049] Furthermore, the power control chip U4 is model number TS321ILT, manufactured by STMicroelectronics. The TS321ILT is a low-power single-channel operational amplifier that can be configured as a comparator or an inverting / non-inverting amplifier, and is a typical analog signal processing chip. In this application, it is configured as a comparator and applied in a high-frequency pulse solenoid valve control circuit. It can amplify the signal to adapt to power drive requirements and achieve power control.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function, characterized in that, include: The power processing module performs overcurrent and overtemperature detection processing on the input power signal; The main control module is used to output high-frequency PWM electrical pulse signals; The signal conversion module is used for converting between positive and negative levels of high-frequency PWM electrical pulse signals; The load drive module is used to control the magnetic field of the coil and drive the valve body of the solenoid valve to work. The power control module is used to control the power of the PWM electrical pulse signal; The power processing module includes diodes DB1 and DB2, a thermistor PT1, an inductor L1, transistors Q1 and Q2, and an overcurrent indicator LED2. One end of the thermistor PT1 is connected to the DC input power signal, and the other end is connected to pin 3 of diode DB1. The two ends of the thermistor PT1 are connected to pins 3 and 4 of diode DB2, respectively. The two ends of the overcurrent indicator LED2 are connected to pins 1 and 2 of diode DB2, respectively. The main control module and inductor L1 are both connected to diode DB1. Transistors Q1 and Q2 are connected in parallel to diode DB1. The signal conversion module and power control module are both electrically connected to inductor L1. Transistor Q1 is electrically connected to the power control module, and transistor Q2 is electrically connected to the load drive module.

2. The high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function as described in claim 1, characterized in that, The main control module includes a main control chip U3 and a filter capacitor C1. The filter capacitor C1 is connected to an externally input DC power signal, and the main control chip U3 is electrically connected to a diode DB through the filter capacitor C1. The signal conversion module and the power control module are electrically connected to the main control chip U3.

3. The high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function as described in claim 2, characterized in that, The main control chip U3 is model TL5001C.

4. A high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function as described in claim 2, characterized in that, The signal conversion module includes a composite transistor U1, which is electrically connected to the main control chip U3, inductor L1, and load drive module.

5. A high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function as described in claim 4, characterized in that, The load drive module includes a load drive chip U2, an inductor L2, a resistor R6, a Zener diode D5, and a Zener diode D6. The load drive chip U2 is electrically connected to the composite transistor U1. The inductor L2, Zener diode D5, and Zener diode D6 are all electrically connected to the load drive chip U2. The resistor R6 and the power control module are electrically connected to the inductor L2. The load drive chip U2 is also electrically connected to the transistor Q2.

6. A high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function as described in claim 5, characterized in that, The load driver chip U2 is the FDS4559.

7. A high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function as described in claim 5, characterized in that, The power control module includes a power control chip U4, which is electrically connected to the inductor L1, the main control chip U3, the resistor R6, the inductor L2, and the transistor Q1.

8. A high-frequency pulse control circuit with overcurrent and overheat protection and self-recovery function as described in claim 7, characterized in that, The power control chip U4 is model TS321ILT.

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