Electromagnet driving protection circuit

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By designing an electromagnet drive protection circuit and using the sampling voltage threshold to detect the impact current, the problem of easy damage of the electromagnet is solved, and the stable operation and safety protection of the electromagnet are achieved.

CN223321089UActive Publication Date: 2025-09-09WENZHOU CHANGJIANG AUTOMOBILE ELECTRONICS SYST

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Patent Information

Application Number: CN202422048917.0
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-08-22
Publication Date: 2025-09-09
Estimated Expiration: 2034-08-22

AI Technical Summary

Technical Problem

The electromagnet is prone to burning and damage during use, and its operating stability gradually decreases, and the existing drive circuit cannot effectively protect it.

Method used

An electromagnet drive protection circuit is designed, which includes a high-side MOS circuit, a power supply, a power inductor, a low-side MOS circuit, a filter circuit, a first sampling circuit, a second sampling circuit and an electromagnet. The surge current is detected by sampling the voltage threshold and the circuit output is controlled to protect the electromagnet.

Benefits of technology

It realizes real-time protection of the electromagnet, prevents device short circuit and abnormal large current impact, and improves the operation stability and safety of the electromagnet.

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Abstract

The utility model relates to an electromagnet driving protection circuit, which is characterized by comprising a high-side MOS (Metal Oxide Semiconductor) circuit, a power supply, a power inductor, a low-side MOS circuit, a filter circuit, a first sampling circuit, a second sampling circuit and an electromagnet, the power supply is connected with the high-side MOS circuit, two ends of the power inductor are respectively connected with the high-side MOS circuit and the electromagnet, the power inductor is connected with an output end of the high-side MOS circuit, the first sampling circuit and the second sampling circuit are respectively connected with two ends of the electromagnet, and the low-side MOS circuit is connected with the electromagnet through the filter circuit. By adopting the technical scheme, the electromagnet driving protection circuit provided by the utility model ensures the safety and stability of the electromagnet in work, different adopted voltage thresholds are set, the purpose of controlling current to drive the electromagnet is achieved, and when the impact current is higher than the set threshold, the power supply output of the circuit can be closed, and the service life of the electromagnet is prolonged. Therefore, the purpose of protecting the circuit is achieved.

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Description

Technical Field

[0001] The utility model relates to an electromagnet drive protection circuit. Background Art

[0002] With the continuous development of modern industry and technology, electromagnets are widely used in equipment across various industries. To effectively control electromagnets, they require corresponding drive circuits. However, due to the characteristics of the electromagnets themselves and the influence of the drive circuits, the operating stability of electromagnets gradually decreases with the extension of usage, and electromagnets are prone to burnout and damage. Summary of the Invention

[0003] The purpose of the utility model is to overcome the defects of the prior art, provide an electromagnet drive protection circuit, ensure the safety and stability of the electromagnet during operation, set different voltage thresholds to achieve the purpose of controlling the current driving the electromagnet, when the impact current is higher than the set threshold, the circuit power output can be shut down, thereby achieving the purpose of protecting the circuit.

[0004] The technical solution of the utility model: an electromagnet drive protection circuit, including a high-side MOS circuit, a power supply, a power inductor, a low-side MOS circuit, a filter circuit, a first sampling circuit, a second sampling circuit and an electromagnet;

[0005] The power supply is connected to the high-side MOS circuit, the two ends of the power inductor are respectively connected to the high-side MOS circuit and the electromagnet, and the power inductor is connected to the output end of the high-side MOS circuit, the first sampling circuit and the second sampling circuit are respectively connected to the two ends of the electromagnet, and the low-side MOS circuit is connected to the electromagnet via the filter circuit.

[0006] It is further configured that the high-side MOS circuit includes a resistor R301, a resistor R302, a resistor R303, a resistor R304, a resistor R305, a resistor R306, a resistor R307, a capacitor C208 and a diode D9, one end of the resistor R303 is connected to the capacitor C208, and the other end is connected to one end of the resistor R304, the other end of the resistor R304 is connected to the capacitor C208, the resistor R305, the resistor R306, the resistor R307 and the negative electrode of the diode D9, one end of the resistor R305 is grounded, and the other end is connected to the resistor R301, one end of the resistor R306 is connected to the resistor R302, and one end of the resistor R307 is connected to the positive electrode of the diode D9.

[0007] The device is further configured to include a voltage stabilizing diode D1 , which is connected in parallel to both ends of the electromagnet.

[0008] Further configuration includes a first energy storage capacitor EC8 and a second energy storage capacitor EC9, wherein the positive poles of the first energy storage capacitor EC8 and the second energy storage capacitor EC9 are connected between the power inductor and the first sampling circuit, and the positive pole of the first energy storage capacitor EC8 and the negative pole of the second energy storage capacitor EC9 are grounded.

[0009] It is further configured that the first sampling circuit includes a resistor R312, a resistor R313, a resistor R314 and a capacitor C209, one end of the resistor R313 is connected to the positive electrode of the second energy storage capacitor EC9, and the other end is connected to one end of the resistor R314 and one end of the resistor R312, one end of the capacitor C209 is connected to the other end of the resistor R312, and the other end is connected to the resistor R314, and the other end of the resistor R314 is grounded.

[0010] It is further configured that the second sampling circuit includes a resistor R315, a resistor R316, a resistor R317 and a capacitor C346, one end of the resistor R315 is connected to the positive electrode of the voltage-stabilizing diode D1, and the other end is connected to one end of the resistor R316 and one end of the resistor R317, one end of the capacitor C346 is connected to the other end of the resistor R316, and the other end is connected to the resistor R317, and the other end of the resistor R317 is grounded.

[0011] It is further configured that the filter circuit includes capacitor C19, capacitor C20, capacitor C21 and capacitor C22, the capacitor C19 and capacitor C20 are connected between the low-side MOS circuit and the electromagnet, one end of the capacitor C21 is connected to the capacitor C19, and the other end is grounded, and one end of the capacitor C22 is connected to the capacitor C20, and the other end is grounded.

[0012] It is further configured that the low-side MOS circuit includes a driving MOS tube, a resistor R186 and a resistor R188, one end of the resistor R186 is connected to the gate of the driving MOS tube, the other end of the resistor R186 is connected to one end of the resistor R188, the other end of the resistor R188 is grounded, and the drain of the driving MOS tube is connected to the capacitor C19 and the capacitor C20.

[0013] The utility model has the following beneficial effects:

[0014] 1. Compared with the traditional electromagnet drive protection circuit, the circuit of the utility model can output PWM with different duty cycles and set gears with different drive capabilities. According to the different driving capabilities and vibration sensations required by different products, it can achieve the purpose of efficient use of energy efficiency.

[0015] 2. The high-side MOS tube circuit uses current-limiting resistors Rsense of different ratios, combined with Vsense=Rsense*Isense / K coefficient (K coefficient, the coefficient of the smart MOS tube itself), and indirectly obtains Isense by sampling the Vsense voltage;

[0016] 3. It can collect current information in real time and detect the impact current generated when the electromagnet is oscillating. Different sampling voltage thresholds can be set to achieve the purpose of controlling different impact currents to drive the electromagnet; when the impact current is higher than the set threshold, the circuit power output can be turned off, thereby achieving the purpose of protecting the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall circuit diagram;

[0018] Figure 2 It is a high-side MOS circuit;

[0019] Figure 3 For each circuit and electromagnet;

[0020] Figure 4 are power inductors and energy storage capacitors;

[0021] Figure 5 is a first sampling circuit;

[0022] Figure 6 is an electromagnet;

[0023] Figure 7 is a second sampling circuit;

[0024] Figure 8 It is a filter circuit;

[0025] Figure 9 It is a low-side MOS circuit. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in this embodiment with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Furthermore, the technical solutions of the various embodiments of this utility model may be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions contradicts or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] like Figure 1-9As shown, an electromagnet drive protection circuit includes a high-side MOS circuit, a power supply, a power inductor, a low-side MOS circuit, a filter circuit, a first sampling circuit, a second sampling circuit and an electromagnet;

[0029] The power supply is connected to the high-side MOS circuit, the two ends of the power inductor are respectively connected to the high-side MOS circuit and the electromagnet, and the power inductor is connected to the output end of the high-side MOS circuit, the first sampling circuit and the second sampling circuit are respectively connected to the two ends of the electromagnet, the low-side MOS circuit is connected to the electromagnet via the filter circuit, the low-side MOS circuit is externally connected to a data processing module, the data processing module can be purchased directly from the market, the data processing module collects current data, detects the working voltage of the electromagnet, controls the power switch, and outputs the electromagnet drive waveform, and turns on or off the product power according to the received data. The data processing module sends a PWM drive signal to control the rapid opening and closing of the low-side MOS circuit to meet the conditions for driving the electromagnet to be attracted and closed, and synchronously samples the AD voltage at both ends of the electromagnet to detect the working condition of the electromagnet. A high-side intelligent MOS tube is used for the power input, and the MCU collects the magnitude of the instantaneous impact current in real time when the electromagnet drive circuit is working. It can prevent the device from short-circuiting or the circuit from burning out due to abnormally large current shock during the vibration process in real time, thereby achieving the purpose of protecting the circuit; the sampling circuit monitors the voltage at both ends of the electromagnet in real time and feeds back the data to the data processing module; the low-side MOS circuit is responsible for the low-side switch control of the module; the filtering circuit removes the interference signal in the circuit to make the driving waveform free of other interference, which can better improve the circuit control accuracy; the power inductor suppresses electromagnetic interference, reduces voltage noise, and maintains current stability; the high-side MOS circuit controls the power output of the entire circuit, and combined with its own characteristics, it can sample the vibration shock current information and feed it back to the data processing module.

[0030] It is further configured that the high-side MOS circuit includes a resistor R301, a resistor R302, a resistor R303, a resistor R304, a resistor R305, a resistor R306, a resistor R307, a capacitor C208 and a diode D9, one end of the resistor R303 is connected to the capacitor C208, and the other end is connected to one end of the resistor R304, the other end of the resistor R304 is connected to the capacitor C208, the resistor R305, the resistor R306, the resistor R307 and the negative electrode of the diode D9, one end of the resistor R305 is grounded, and the other end is connected to the resistor R301, and the resistor R One end of 306 is connected to resistor R302, one end of resistor R307 is connected to the positive electrode of diode D9, the high-side MOS circuit also includes a switching power supply chip, the switching power supply chip adopts VN7050ASTR, resistor R301 is connected to pin 1 of the switching power supply chip, resistor R302 is connected to pin 2 of the switching power supply chip, resistor R303 is connected to pin 3 of the switching power supply chip, the anode of diode D9 is connected to pin 4 of the switching power supply chip, the power inductor is connected to output pins 6 and 7 of the switching power supply chip, and the power supply is connected to pins 5 and 8 of the switching power supply chip.

[0031] Further configuration includes a voltage regulator diode D1, which is connected in parallel at both ends of the electromagnet. The voltage regulator diode D1 is connected in parallel at both ends of the electromagnet to prevent the inductor coil on the electromagnet from generating induced electromotive force when the electromagnet is turned off, thereby preventing high voltage from being generated instantly, thereby protecting the circuit.

[0032] Further configuration includes a first energy storage capacitor EC8 and a second energy storage capacitor EC9, energy storage capacitors, circuit filtering and voltage stabilization; the positive poles of the first energy storage capacitor EC8 and the second energy storage capacitor EC9 are connected between the power inductor and the first sampling circuit, and the positive pole of the first energy storage capacitor EC8 and the negative pole of the second energy storage capacitor EC9 are grounded.

[0033] It is further configured that the first sampling circuit includes a resistor R312, a resistor R313, a resistor R314 and a capacitor C209, one end of the resistor R313 is connected to the positive electrode of the second energy storage capacitor EC9, and the other end is connected to one end of the resistor R314 and one end of the resistor R312, one end of the capacitor C209 is connected to the other end of the resistor R312, and the other end is connected to the resistor R314, and the other end of the resistor R314 is grounded.

[0034] It is further configured that the second sampling circuit includes a resistor R315, a resistor R316, a resistor R317 and a capacitor C346, one end of the resistor R315 is connected to the positive electrode of the voltage-stabilizing diode D1, and the other end is connected to one end of the resistor R316 and one end of the resistor R317, one end of the capacitor C346 is connected to the other end of the resistor R316, and the other end is connected to the resistor R317, and the other end of the resistor R317 is grounded.

[0035] It is further configured that the filter circuit includes capacitor C19, capacitor C20, capacitor C21 and capacitor C22, the capacitor C19 and capacitor C20 are connected between the low-side MOS circuit and the electromagnet, one end of the capacitor C21 is connected to the capacitor C19, and the other end is grounded, and one end of the capacitor C22 is connected to the capacitor C20, and the other end is grounded.

[0036] It is further configured that the low-side MOS circuit includes a driving MOS tube, a resistor R186 and a resistor R188, one end of the resistor R186 is connected to the gate of the driving MOS tube, the other end of the resistor R186 is connected to one end of the resistor R188, the other end of the resistor R188 is grounded, and the drain of the driving MOS tube is connected to the capacitor C19 and the capacitor C20.

[0037] The utility model has the following beneficial effects:

[0038] 1. Compared with the traditional electromagnet drive protection circuit, the circuit of the utility model can output PWM with different duty cycles and set gears with different drive capabilities. According to the different driving capabilities and vibration sensations required by different products, it can achieve the purpose of efficient use of energy efficiency.

[0039] 2. The high-side MOS tube circuit uses current-limiting resistors Rsense of different ratios, combined with Vsense=Rsense*Isense / K coefficient (K coefficient, the coefficient of the smart MOS tube itself), and indirectly obtains Isense by sampling the Vsense voltage;

[0040] 3. It can collect current information in real time and detect the impact current generated when the electromagnet is oscillating. Different sampling voltage thresholds can be set to achieve the purpose of controlling different impact currents to drive the electromagnet; when the impact current is higher than the set threshold, the circuit power output can be turned off, thereby achieving the purpose of protecting the circuit.

Claims

1. An electromagnet drive protection circuit, characterized in that: It includes a high-side MOS circuit, a power supply, a power inductor, a low-side MOS circuit, a filter circuit, a first sampling circuit, a second sampling circuit and an electromagnet; The power supply is connected to the high-side MOS circuit, the two ends of the power inductor are respectively connected to the high-side MOS circuit and the electromagnet, and the power inductor is connected to the output end of the high-side MOS circuit, the first sampling circuit and the second sampling circuit are respectively connected to the two ends of the electromagnet, and the low-side MOS circuit is connected to the electromagnet via the filter circuit.

2. The electromagnet drive protection circuit according to claim 1, characterized in that: The high-side MOS circuit includes a resistor R301, a resistor R302, a resistor R303, a resistor R304, a resistor R305, a resistor R306, a resistor R307, a capacitor C208 and a diode D9. One end of the resistor R303 is connected to the capacitor C208, and the other end is connected to one end of the resistor R304. The other end of the resistor R304 is connected to the negative electrode of the capacitor C208, the resistor R305, the resistor R306, the resistor R307 and the diode D9. One end of the resistor R305 is grounded, and the other end is connected to the resistor R301. One end of the resistor R306 is connected to the resistor R302. One end of the resistor R307 is connected to the positive electrode of the diode D9.

3. The electromagnet drive protection circuit according to claim 1 or 2, characterized in that: The device further comprises a voltage stabilizing diode D1 , which is connected in parallel to both ends of the electromagnet.

4. The electromagnet drive protection circuit according to claim 1 or 2, characterized in that: It also includes a first energy storage capacitor EC8 and a second energy storage capacitor EC9, the positive electrodes of the first energy storage capacitor EC8 and the second energy storage capacitor EC9 are connected between the power inductor and the first sampling circuit, and the positive electrode of the first energy storage capacitor EC8 and the negative electrode of the second energy storage capacitor EC9 are grounded.

5. The electromagnet drive protection circuit according to claim 4, characterized in that: The first sampling circuit includes a resistor R312, a resistor R313, a resistor R314 and a capacitor C209. One end of the resistor R313 is connected to the positive electrode of the second energy storage capacitor EC9, and the other end is connected to one end of the resistor R314 and one end of the resistor R312. One end of the capacitor C209 is connected to the other end of the resistor R312 and the other end is connected to the resistor R314. The other end of the resistor R314 is grounded.

6. The electromagnet drive protection circuit according to claim 3, characterized in that: The second sampling circuit includes a resistor R315, a resistor R316, a resistor R317 and a capacitor C346. One end of the resistor R315 is connected to the anode of the voltage-stabilizing diode D1, and the other end is connected to one end of the resistor R316 and one end of the resistor R317. One end of the capacitor C346 is connected to the other end of the resistor R316 and the other end is connected to the resistor R317. The other end of the resistor R317 is grounded.

7. The electromagnet drive protection circuit according to claim 1 or 2, characterized in that: The filter circuit includes capacitor C19, capacitor C20, capacitor C21 and capacitor C22. The capacitors C19 and C20 are connected between the low-side MOS circuit and the electromagnet. One end of the capacitor C21 is connected to the capacitor C19 and the other end is grounded. One end of the capacitor C22 is connected to the capacitor C20 and the other end is grounded.

8. The electromagnet drive protection circuit according to claim 7, characterized in that: The low-side MOS circuit includes a driving MOS transistor, a resistor R186 and a resistor R188. One end of the resistor R186 is connected to the gate of the driving MOS transistor, the other end of the resistor R186 is connected to one end of the resistor R188, and the other end of the resistor R188 is grounded. The drain of the driving MOS transistor is connected to the capacitor C19 and the capacitor C20.