Electrostatic interference isolation circuits and electronic products
By designing an electrostatic interference isolation circuit, and using an isolation unit and an isolation communication unit to isolate the electrostatic interference transmitted from the detection element, the problem of circuit damage of electronic products in an electrostatic rich environment is solved, and the full coupling absorption of electrostatic interference and the safe operation of the circuit is achieved.
Patent Information
- Application Number
- CN202420847702.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-04-22
AI Technical Summary
Some electronic products are susceptible to electrostatic interference in an environment rich in static electricity, resulting in circuit damage and product failure.
An electrostatic interference isolation circuit is designed, including an isolation unit and an isolation communication unit. Through the isolation unit, the electrostatic interference in the detection signal transmitted by the detection element is isolated, the target detection signal is obtained, and transmitted to the detection processing loop; the isolation communication unit further electrostatic isolation of the target detection signal is fed back to the system control circuit.
It effectively isolates the electrostatic interference transmitted from the detection components, prevents static damage to the circuit and products, and ensures that each circuit module avoids static interference during signal transmission and maintains a safe working environment.
Smart Images
Figure CN222721480U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic circuits, in particular to an electrostatic interference isolation circuit and an electronic product. Background Art
[0002] Due to design requirements for the way they are used, some electronic products need to expose detection components, such as exposing probes to collect the required signals. The working environment of the exposed components may generate a lot of static electricity. For example, in a dusty environment or in a dry winter, more static electricity will be generated. If the static electricity is not isolated and processed in time, it will directly enter the interior of the electronic product from the detection components and damage the internal circuit of the electronic product, thereby damaging the electronic product and causing it to fail to work properly.
[0003] Therefore, in order to solve the above problems, the utility model provides an electrostatic interference isolation circuit and an electronic product capable of protecting against static electricity. Utility Model Content
[0004] The utility model provides an electrostatic interference isolation circuit and an electronic product, aiming to solve the problem that the circuit is easily damaged due to electrostatic interference.
[0005] In order to solve the above-mentioned technical problems, the utility model provides, on the one hand, an electrostatic interference isolation circuit, which includes: an isolation unit, one end of which is used to connect to a detection element, and the other end of which is used to connect to a detection processing circuit, the detection element is used to transmit a detection signal, the detection signal includes electrostatic interference, the isolation unit is used to isolate the electrostatic interference to obtain a target detection signal, and transmit the target detection signal to the detection processing circuit; an isolation communication unit, one end of which is connected to the detection processing circuit, and the other end of which is used to connect to a system control circuit, the isolation communication unit is used to isolate the target detection signal and then feed it back to the system control circuit.
[0006] Furthermore, the electrostatic interference isolation circuit also includes an isolation power supply unit, one end of which is used to receive an input voltage and the other end is used to connect to the detection processing circuit. The isolation power supply unit is used to isolate and filter the input voltage to provide a working voltage to the detection processing circuit.
[0007] Furthermore, the isolation unit includes a first isolation module and a second isolation module, one end of the first isolation module is used to connect to the detection element and the detection processing circuit, and the other end is grounded; one end of the second isolation module is connected to the first isolation module and the detection element, and the other end is connected to the isolation power supply unit.
[0008] Furthermore, the first isolation module includes a first TVS diode, a first filter module and a second filter module, one end of the first filter module is used to connect to the first connection end of the detection element, and the other end is grounded; one end of the second filter module is used to connect to the second connection end of the detection element, and the other end is grounded; the cathode of the first TVS diode is connected to the first connection end of the first filter module and the detection processing loop, and the anode of the first TVS diode is connected to the second connection end of the second filter module and the detection processing loop.
[0009] Furthermore, the first filtering module includes a first resistor and a first capacitor, one end of the first resistor is used to be connected to the first connection end of the detection element, the other end is connected to one end of the first capacitor, and the other end of the first capacitor is grounded; the second filtering module includes a second resistor and a second capacitor, one end of the second resistor is used to be connected to the second connection end of the detection element, the other end is connected to one end of the second capacitor, and the other end of the second capacitor is grounded.
[0010] Furthermore, the second isolation module includes a first isolation capacitor and a second isolation capacitor, one end of the first isolation capacitor is connected to the positive electrode of the first TVS diode and the second connection end of the detection processing loop, and the other end is connected to the isolation power supply unit; one end of the second isolation capacitor is connected to the negative electrode of the first TVS diode and the first connection end of the detection processing loop, and the other end is connected to the isolation power supply unit.
[0011] Furthermore, the isolated power supply unit includes an isolated DC-DC power supply and a third isolation module, one end of the isolated DC-DC power supply is used to receive the input voltage, and the other end is used to connect to the detection and processing circuit; one end of the third isolation module is connected to the isolated DC-DC power supply, and the other end is connected to the detection and processing circuit.
[0012] Furthermore, the third isolation module includes a third isolation capacitor, a fourth isolation capacitor and a second TVS diode, one end of the third isolation capacitor is used to be connected to the third connection end of the detection processing loop, and the other end is used to be connected to the isolated DC-DC power supply; one end of the fourth isolation capacitor is used to be connected to the fourth connection end of the detection processing loop, and the other end is used to be connected to the isolated DC-DC power supply; the cathode of the second TVS diode is connected to the third connection end of the detection processing loop, and the anode of the second TVS diode is connected to the fourth connection end of the detection processing loop.
[0013] Furthermore, the isolation communication unit includes an optocoupler, the cathode of the light-emitting diode of the optocoupler is connected to the fifth connection terminal of the detection and processing circuit, and the anode of the light-emitting diode of the optocoupler is connected to the sixth connection terminal of the detection and processing circuit; one end of the photosensitive device of the optocoupler is used to be connected to the first connection terminal of the system control circuit, and the other end of the photosensitive device of the optocoupler is used to be connected to the second connection terminal of the system control circuit.
[0014] On the other hand, the utility model also provides an electronic product, which includes a detection element, a detection processing circuit, a system control circuit and the electrostatic interference isolation circuit as mentioned above, wherein the detection element is connected to the detection processing circuit via an isolation unit in the electrostatic interference isolation circuit, and the detection processing circuit is connected to the system control circuit via an isolation communication unit in the electrostatic interference isolation circuit.
[0015] The electrostatic interference isolation circuit and electronic product disclosed by the utility model isolates the electrostatic interference in the detection signal transmitted by the detection element through the isolation unit to obtain the target detection signal, and transmits the target detection signal to the detection processing circuit, and then the isolation communication unit further electrostatically isolates the target detection signal transmitted by the detection processing circuit and feeds it back to the system control circuit. The isolation unit and the isolation communication unit are used to perform electrostatic isolation in succession, which can achieve sufficient coupling absorption of the electrostatic interference transmitted by the detection element to attenuate the static electricity in the circuit, so that each circuit module can avoid electrostatic interference during the signal transmission process, ensure that each circuit module is in a safe working environment, and prevent static electricity from damaging the product. The electrostatic interference isolation circuit disclosed by the utility model solves the problem that the circuit is easily damaged due to electrostatic interference. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 It is a structural schematic diagram of an electrostatic interference isolation circuit provided by an embodiment of the utility model;
[0018] Figure 2 This is a circuit schematic diagram of an electrostatic interference isolation circuit provided by an embodiment of the utility model;
[0019] Figure 3 It is a structural schematic diagram of an electronic product provided by an embodiment of the utility model;
[0020] Reference numerals:
[0021] 10. Electrostatic interference isolation circuit; 11. Isolation unit; 111. First isolation module; 112. Second isolation module; 12. Isolation communication unit; 13. Isolation power supply unit; 131. Isolation DC-DC power supply; 132. Third isolation module; 100. Electronic product; 20. Detection element; 30. Detection processing circuit; 40. System control circuit. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.
[0024] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
[0025] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0026] Figures 1 to 3An embodiment of the electrostatic interference isolation circuit provided by the utility model is shown. The electrostatic interference isolation circuit 10 of this embodiment includes an isolation unit 11 and an isolation communication unit 12, wherein one end of the isolation unit 11 is used to connect with the detection element 20, and the other end is used to connect with the detection processing circuit 30, the detection element 20 is used to transmit a detection signal, the detection signal includes electrostatic interference, the isolation unit 11 is used to isolate the electrostatic interference to obtain a target detection signal, and transmit the target detection signal to the detection processing circuit 30; one end of the isolation communication unit 12 is connected to the detection processing circuit 30, and the other end is used to connect with the system control circuit 40, the isolation communication unit 12 is used to isolate the target detection signal and then feed it back to the system control circuit 40. In this embodiment, the electrostatic interference in the detection signal transmitted by the detection element 20 is isolated by the isolation unit 11 to obtain a target detection signal, and the target detection signal is transmitted to the detection processing circuit 30. The isolation communication unit 12 further electrostatically isolates the target detection signal transmitted by the detection processing circuit 30 and then feeds it back to the system control circuit 40. By using the isolation unit 11 and the isolation communication unit 12 to perform electrostatic isolation in turn, sufficient coupling absorption of the electrostatic interference transmitted from the detection element 20 can be achieved to attenuate the electrostatic interference in the circuit, so that each circuit module can avoid electrostatic interference during the signal transmission process, ensure that each circuit module is in a safe working environment, and prevent static electricity from damaging the product.
[0027] In one embodiment, such as this embodiment, Figure 2 As shown, the electrostatic interference isolation circuit 10 also includes an isolation power supply unit 13, one end of which is used to receive an input voltage, and the other end is used to connect to the detection processing circuit 30. The isolation power supply unit 13 is used to isolate and filter the input voltage to provide a working voltage to the detection processing circuit 30.
[0028] In one embodiment, such as this embodiment, Figure 2As shown, the isolation unit 11 includes a first isolation module 111 and a second isolation module 112, one end of the first isolation module 111 is used to connect with the detection element 20 and the detection processing loop 30, and the other end is grounded; one end of the second isolation module 112 is connected to the first isolation module 111 and the detection element 20, and the other end is connected to the isolation power supply unit 13. Specifically, the first isolation module 111 includes a first TVS diode TVS1, a first filter module and a second filter module, one end of the first filter module is used to connect with the first connection end of the detection element 20, and the other end is grounded; one end of the second filter module is used to connect with the second connection end of the detection element 20, and the other end is grounded; the cathode of the first TVS diode TVS1 is connected to the first connection end of the first filter module and the detection processing loop 30, and the anode of the first TVS diode TVS1 is connected to the second connection end of the second filter module and the detection processing loop 30. It can be understood that the number of isolation modules included in the isolation unit 11 can be set according to actual needs to achieve the required isolation effect of electrostatic interference.
[0029] Further, the first filter module includes a first resistor R1 and a first capacitor C5, one end of the first resistor R1 is used to connect to the first connection end of the detection element 20, the other end is connected to one end of the first capacitor C5, and the other end of the first capacitor C5 is grounded; the second filter module includes a second resistor R2 and a second capacitor C4, one end of the second resistor R2 is used to connect to the second connection end of the detection element 20, the other end is connected to one end of the second capacitor C4, and the other end of the second capacitor C4 is grounded. In this embodiment, the first resistor R1, the second resistor R2, the first capacitor C5 and the second capacitor C4 form two groups of RC filter circuits to absorb and attenuate the static electricity in the environment received by the detection element in the first step, and then the static electricity is further clamped by the first TVS diode TVS1 to achieve the effect of preliminary isolation of static electricity interference.
[0030] Further, the second isolation module 112 includes a first isolation capacitor CY3 and a second isolation capacitor CY4, one end of the first isolation capacitor CY3 is connected to the positive electrode of the first TVS diode TVS1 and the second connection end of the detection processing loop 30, and the other end is connected to the isolation power supply unit 13; one end of the second isolation capacitor CY4 is connected to the negative electrode of the first TVS diode TVS1 and the first connection end of the detection processing loop 30, and the other end is connected to the isolation power supply unit 13. In this embodiment, static electricity is further coupled and absorbed to the detection processing loop 30 by the first isolation capacitor CY3 and the second isolation capacitor CY4 for attenuation.
[0031] In one embodiment, such as this embodiment, Figure 2 As shown, the isolated power supply unit 13 includes an isolated DC-DC power supply 131 and a third isolation module 132, one end of the isolated DC-DC power supply 131 is used to receive the input voltage, and the other end is used to connect to the detection processing loop 30; one end of the third isolation module 132 is connected to the isolated DC-DC power supply 131, and the other end is connected to the detection processing loop 30. Specifically, the third isolation module 132 includes a third isolation capacitor CY1, a fourth isolation capacitor CY2 and a second TVS diode TVS3, one end of the third isolation capacitor CY1 is used to connect to the third connection end of the detection processing loop 30, and the other end is used to connect to the isolated DC-DC power supply 131; one end of the fourth isolation capacitor is used to connect to the fourth connection end of the detection processing loop 30, and the other end is used to connect to the isolated DC-DC power supply 131; the cathode of the second TVS diode TVS3 is connected to the third connection end of the detection processing loop 30, and the anode of the second TVS diode is connected to the fourth connection end of the detection processing loop 30. In this embodiment, the electrostatic interference can be further isolated and attenuated by the third isolation capacitor CY1, the fourth isolation capacitor CY2 and the second TVS diode TVS3, thereby ensuring that the isolated DC-DC power supply 131 and the detection processing circuit 30 are minimally interfered with by electrostatic interference and can be in a safe working environment. It should be noted that in this embodiment, the isolated DC-DC power supply 131 is an isolated power supply, which has the function of storing energy and filtering the input voltage, can filter the input voltage, reduce interference noise, and stabilize the input voltage and supply power to the detection processing circuit 30.
[0032] In one embodiment, such as this embodiment, Figure 2 As shown, the isolated communication unit 12 includes an optical coupler U1, the cathode of the light emitting diode of the optical coupler U1 is connected to the fifth connection terminal of the detection processing circuit 30, and the anode of the light emitting diode of the optical coupler U1 is connected to the sixth connection terminal of the detection processing circuit 30; one end of the photosensitive device of the optical coupler U1 is used to connect to the first connection terminal of the system control circuit 40, and the other end of the photosensitive device of the optical coupler U1 is used to connect to the second connection terminal of the system control circuit 40. In this embodiment, the detection processing circuit 30 feeds back the target detection signal to the system control circuit 40 through an isolated communication element such as the optical coupler U1. In the process of transmitting the target detection signal, this isolated communication method can prevent static electricity from directly entering the system control circuit 40, thereby protecting the system control circuit 40.
[0033] To summarize, the electrostatic interference in the detection signal transmitted by the detection element 20 to the detection processing circuit 30 is first coupled and absorbed by the RC filter module of the first isolation module 111 (two groups of filter modules composed of R1, R2, C4 and C5), and then further coupled and absorbed into the detection processing circuit 30 by the isolation capacitor (CY3 and CY4) of the second isolation module 112; at the same time, the isolation capacitor (capacitor CY1 and capacitor CY2) in the isolation power supply unit 13 also isolates the static electricity in the input voltage, thereby ensuring that the electrostatic interference in the detection processing circuit 30 is reduced as much as possible; finally, the target detection signal in the detection processing circuit is fed back to the system control circuit through the isolation communication unit 12, and the electrostatic interference in the target detection signal is further isolated by using the isolation communication element optocoupler U1, and the electrostatic interference in the circuit is reduced to a minimum through multiple isolation methods to ensure that the circuit is not affected by electrostatic interference and works normally.
[0034] In an embodiment, such as this embodiment, an electronic product 100 is also provided. Figure 3 The electronic product 100 includes a detection element 20, a detection processing circuit 30, a system control circuit 40 and the electrostatic interference isolation circuit 10 as described above, wherein the detection element 20 is connected to the detection processing circuit 30 via an isolation unit 11 in the electrostatic interference isolation circuit 10, and the detection processing circuit 30 is connected to the system control circuit 40 via an isolation communication unit 12 in the electrostatic interference isolation circuit 10.
[0035] The electrostatic interference isolation circuit provided by the utility model isolates the electrostatic interference in the detection signal transmitted by the detection element through the isolation unit to obtain the target detection signal, and transmits the target detection signal to the detection processing circuit, and then the isolation communication unit further electrostatically isolates the target detection signal transmitted by the detection processing circuit and feeds it back to the system control circuit. The isolation unit and the isolation communication unit are used to perform electrostatic isolation in succession, which can achieve sufficient coupling absorption of the electrostatic interference transmitted by the detection element to attenuate the electrostatic interference in the circuit, so that each circuit module can avoid electrostatic interference during the signal transmission process, ensure that each circuit module is in a safe working environment, and prevent static electricity from damaging the product. The electrostatic interference isolation circuit disclosed by the utility model solves the problem that the circuit is easily damaged due to electrostatic interference.
[0036] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. An electrostatic interference isolation circuit, characterized in that: include: An isolation unit, one end of which is used to connect with a detection element and the other end of which is used to connect with a detection processing circuit. The detection element is used to transmit a detection signal, and the detection signal includes electrostatic interference. The isolation unit is used to isolate the electrostatic interference to obtain a target detection signal, and transmit the target detection signal to the detection processing circuit; An isolation communication unit, one end of which is connected to the detection processing loop, and the other end of which is used to connect to the system control circuit. The isolation communication unit is used to isolate the target detection signal and then feed it back to the system control circuit.
2. The electrostatic interference isolation circuit according to claim 1, characterized in that: The electrostatic interference isolation circuit also includes an isolation power supply unit, one end of which is used to receive an input voltage and the other end is used to connect to the detection processing circuit. The isolation power supply unit is used to isolate and filter the input voltage to provide a working voltage to the detection processing circuit.
3. The electrostatic interference isolation circuit according to claim 2, characterized in that: The isolation unit includes a first isolation module and a second isolation module. One end of the first isolation module is used to connect to the detection element and the detection processing circuit, and the other end is grounded; one end of the second isolation module is connected to the first isolation module and the detection element, and the other end is connected to the isolation power supply unit.
4. The electrostatic interference isolation circuit according to claim 3, characterized in that: The first isolation module includes a first TVS diode, a first filter module and a second filter module, one end of the first filter module is used to connect to the first connection end of the detection element, and the other end is grounded; one end of the second filter module is used to connect to the second connection end of the detection element, and the other end is grounded; the cathode of the first TVS diode is connected to the first connection end of the first filter module and the detection processing loop, and the anode of the first TVS diode is connected to the second connection end of the second filter module and the detection processing loop.
5. The electrostatic interference isolation circuit according to claim 4, characterized in that: The first filtering module includes a first resistor and a first capacitor, one end of the first resistor is used to be connected to the first connection end of the detection element, the other end is connected to one end of the first capacitor, and the other end of the first capacitor is grounded; the second filtering module includes a second resistor and a second capacitor, one end of the second resistor is used to be connected to the second connection end of the detection element, the other end is connected to one end of the second capacitor, and the other end of the second capacitor is grounded.
6. The electrostatic interference isolation circuit according to claim 4, characterized in that: The second isolation module includes a first isolation capacitor and a second isolation capacitor, one end of the first isolation capacitor is connected to the positive electrode of the first TVS diode and the second connection end of the detection processing loop, and the other end is connected to the isolation power supply unit; one end of the second isolation capacitor is connected to the negative electrode of the first TVS diode and the first connection end of the detection processing loop, and the other end is connected to the isolation power supply unit.
7. The electrostatic interference isolation circuit according to claim 2, characterized in that: The isolated power supply unit includes an isolated DC-DC power supply and a third isolation module, one end of the isolated DC-DC power supply is used to receive the input voltage, and the other end is used to connect to the detection and processing circuit; one end of the third isolation module is connected to the isolated DC-DC power supply, and the other end is connected to the detection and processing circuit.
8. The electrostatic interference isolation circuit according to claim 7, characterized in that: The third isolation module includes a third isolation capacitor, a fourth isolation capacitor and a second TVS diode, one end of the third isolation capacitor is used to be connected to the third connection end of the detection processing loop, and the other end is used to be connected to the isolated DC-DC power supply; one end of the fourth isolation capacitor is used to be connected to the fourth connection end of the detection processing loop, and the other end is used to be connected to the isolated DC-DC power supply; the cathode of the second TVS diode is connected to the third connection end of the detection processing loop, and the anode of the second TVS diode is connected to the fourth connection end of the detection processing loop.
9. The electrostatic interference isolation circuit according to claim 1, characterized in that: The isolated communication unit includes an optocoupler, the cathode of the light-emitting diode of the optocoupler is connected to the fifth connection terminal of the detection and processing circuit, and the anode of the light-emitting diode of the optocoupler is connected to the sixth connection terminal of the detection and processing circuit; one end of the photosensitive device of the optocoupler is used to be connected to the first connection terminal of the system control circuit, and the other end of the photosensitive device of the optocoupler is used to be connected to the second connection terminal of the system control circuit.
10. An electronic product, characterized in that: The electronic product includes a detection element, a detection processing circuit, a system control circuit and an electrostatic interference isolation circuit as described in any one of claims 1 to 9, wherein the detection element is connected to the detection processing circuit via an isolation unit in the electrostatic interference isolation circuit, and the detection processing circuit is connected to the system control circuit via an isolation communication unit in the electrostatic interference isolation circuit.