A protection circuit and a signal acquisition device

Abstract

A protection circuit is connected to exposed electrodes: a first electrode and a second electrode. The protection circuit includes a controllable switch, a control loop configured to control the on / off state of the controllable switch, and a main loop configured to consume or discharge electricity. One end of the controllable switch is connected to the first electrode, the other end of the controllable switch is connected to the main loop, the second electrode is connected to the main loop, and when the control loop receives an externally input trigger signal, it controls the controllable switch to conduct. When no external trigger signal is received, the exposed electrodes of the electronic device are disconnected from the main loop. Therefore, the exposed electrodes can be made non-electrified, preventing the human body or other devices from being damaged by electric leakage and meeting the industry requirements for the voltage of the exposed electrodes; in addition, if the exposed electrodes come into contact with high-voltage static electricity, the high-voltage static electricity will not be directly conducted to the main loop, thus preventing electrostatic damage to components.

Description

Technical Field

[0001] This application belongs to the technical field of electronic circuits, and particularly relates to a protection circuit and a signal acquisition device. Background Art

[0002] Currently, for medical detection, communication environments, and the safety of medical devices, it is required that the exposed electrodes of medical devices such as charging devices should not be charged beyond the required voltage. Additionally, the ground electrode for charging wearable devices is connected to the internal circuit, and when exposed to high-voltage static electricity such as contact discharge above 8 kV, it is likely to conduct to other devices sharing the same ground, causing electrostatic damage. Summary of the Invention

[0003] The purpose of this application is to provide a protection circuit and a signal acquisition device, aiming to solve the problems of the charging requirements of the exposed electrodes of the signal acquisition device and electrostatic damage.

[0004] In the first aspect of the embodiments of this application, a protection circuit is provided. The exposed electrodes include a first electrode and a second electrode, one of the first electrode and the second electrode is a positive electrode, and the other is a ground electrode. The protection circuit includes a controllable switch, a control circuit configured to control the on / off of the controllable switch, and a main circuit configured to charge or discharge. One end of the controllable switch is connected to the first electrode, the other end of the controllable switch is connected to the main circuit, the second electrode is connected to the main circuit, and when the control circuit receives an externally input trigger signal, it controls the controllable switch to conduct, so that the first electrode is connected to the main circuit.

[0005] In one embodiment, the control circuit includes a Hall switch, the trigger signal is a magnetic force signal, and the Hall switch controls the controllable switch to close under the drive of the magnetic force signal.

[0006] In one embodiment, the control circuit includes a drive circuit, the trigger signal is an electrical signal input from the second electrode, and the drive circuit controls the controllable switch to close under the drive of the electrical signal.

[0007] In one embodiment, the controllable switch is a relay, a semiconductor switch tube, or a disconnect switch.

[0008] In one embodiment, when the protection circuit is provided in a portable host, the main circuit is a charging circuit, the first electrode is a ground electrode, and the second electrode is a positive electrode.

[0009] In one embodiment, when the protection circuit is provided in a charging base, the main circuit is a discharge main circuit, the first electrode is a positive electrode, and the second electrode is a ground electrode.

[0010] In the second aspect of the embodiments of the present application, a signal acquisition device is provided. The signal acquisition device includes a charging base and / or a portable host that are matched with each other. The above protection circuit is provided on the charging base and / or the portable host. When the portable host is docked with the charging base, the first electrode of the portable host is in electrical contact with the second electrode of the charging base, and the second electrode of the portable host is in electrical contact with the first electrode of the charging base. The trigger signal received by the control circuit in the charging base is provided by the portable host, and the trigger signal received by the control circuit of the portable host is provided by the charging base. The first electrode and the second electrode of the charging base are the first positive electrode and the first ground electrode respectively, and the first electrode and the second electrode of the portable host are the second ground electrode and the second positive electrode respectively.

[0011] In one embodiment, the charging base is provided with a first magnetic block that is electromagnetically coupled to the first ground electrode, and a magnetic conductive sheet is provided on the portable host. One end of the magnetic conductive sheet is electromagnetically coupled to the second ground electrode of the portable host. When the portable host is docked with the charging base, the other end of the magnetic conductive sheet faces the control circuit on the charging base to provide an electromagnetic trigger signal for the Hall switch of the control circuit.

[0012] In one embodiment, the control circuit of the portable host includes a Hall switch provided on one side of the second ground electrode. When the portable host is docked with the charging base, the first magnetic block of the charging base provides an electromagnetic trigger signal for the Hall switch of the portable host.

[0013] In one embodiment, the charging base is provided with a first magnetic block, and the portable host is provided with a second magnetic block. When the portable host is docked with the charging base, the first magnetic block faces the control circuit on the portable host to provide an electromagnetic trigger signal for the Hall switch of the control circuit on the portable host; the second magnetic block faces the control circuit on the charging base to provide an electromagnetic trigger signal for the Hall switch of the control circuit on the charging base.

[0014] In one embodiment, the control circuit of the portable host includes a drive circuit. The input end of the drive circuit is connected to the second positive electrode, and the output end is connected to the control end of the controllable switch of the portable host. When the portable host is docked with the charging base, the trigger signal is an electrical signal input from the second positive electrode, and the drive circuit controls the controllable switch to close under the drive of the electrical signal.

[0015] The above protection circuit controls the connection and disconnection between the main circuit and the electrode by setting a controllable switch. When no external trigger signal is received, the exposed electrode of the electronic device is disconnected from the main circuit. Therefore, the exposed electrode can be made non - charged, preventing the human body or other devices from being damaged by electric leakage, which meets the industry requirements for the voltage of the exposed electrode. In addition, if the exposed electrode comes into contact with high - voltage static electricity, it will not directly conduct the high - voltage static electricity to the main circuit, thus preventing electrostatic damage to components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 Structural schematic diagram of the protection circuit provided by an embodiment of the present application;

[0018] Figure 2 Structural schematic diagram of the protection circuit provided by another embodiment of the present application;

[0019] Figure 3 For the portable device provided by the first embodiment of the present application, which includes Figure 1 or Figure 2 Structural schematic diagram of the docking of the portable device with the charging base, showing the circuit;

[0020] Figure 4 For Figure 1 or Figure 2 Schematic diagram of the circuit principle of the first embodiment of the control loop in the protection circuit shown;

[0021] Figure 5 For Figure 1 or Figure 2 Schematic diagram of the circuit principle of the second embodiment of the control loop in the protection circuit shown;

[0022] Figure 6 For Figure 1 or Figure 2 Schematic diagram of the circuit principle of the third embodiment of the control loop in the protection circuit shown;

[0023] Figure 7 For the portable device provided by the second embodiment of the present application, which includes Figure 1 or Figure 2 Structural schematic diagram of the docking of the portable device with the charging base, showing the circuit;

[0024] Figure 8 For the portable device provided by the third embodiment of the present application, which includes Figure 1 orFigure 2 Schematic diagram of the structure of a portable device with the shown circuit docked to a charging stand. Detailed implementation

[0025] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application 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 only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0028] Please refer to Figure 1 and Figure 2 , the protection circuit provided by the embodiment of the present application is connected to a bare electrode, and the bare electrode includes a first electrode 11 and a second electrode 12. One of the first electrode 11 and the second electrode 12 is a positive electrode and the other is a ground electrode. The protection circuit includes a controllable switch 13, a control circuit 14 configured to control the on / off of the controllable switch 13, and a main circuit 15 configured to use electricity or discharge. One end of the controllable switch 13 is connected to the first electrode 11, the other end of the controllable switch 13 is connected to the main circuit 15, the second electrode 12 is connected to the main circuit 15, and when the control circuit 14 receives an externally input trigger signal, it controls the controllable switch 13 to conduct, so that the first electrode 11 is connected to the main circuit 15.

[0029] By setting the on / off of the connection between the controllable switch 13 and the main circuit 15 of the protection circuit, when no external trigger signal is received, the electrode 11 of the electronic device is disconnected from the main circuit 15. Therefore, the bare electrode 11 can be made non-powered, preventing the human body or other devices from being damaged by electric leakage and meeting the industry requirements for the voltage of the bare electrode; in addition, if the bare electrode 11 comes into contact with high-voltage static electricity, it will not directly conduct the high-voltage static electricity to the main circuit 15, thereby causing electrostatic damage to the components.

[0030] Please refer to Figure 3, the above protection circuit can be applied to the portable host 10b. The main circuit is the charging circuit 15b of the portable host 10b. The first electrode 11b of the portable host 10b is the ground electrode, and the second electrode 12b of the portable host 10b is the positive electrode. At this time, the charging circuit 15b refers to the circuit that completes the main functions of the portable host 10b. For example, it can include a control chip, a power supply circuit, a functional circuit, and a battery. The functional circuit is set according to the different functions of the portable host 10b, such as a display screen, a communication circuit, an interface circuit, etc., which are not limited here. Before the portable host 10b receives a trigger signal, the ground electrode 11b is disconnected from the main circuit 15b. Specifically, it is disconnected from the ground terminal of the main circuit 15b. Even if the ground electrode 11b comes into contact with high-voltage static electricity, it will not conduct the high-voltage static electricity to the main circuit 15b, thus causing electrostatic damage to the components.

[0031] Please refer to Figure 3 , the above protection circuit can be applied to the charging dock 10a that charges the portable host 10b. The main circuit is the discharge main circuit 15a of the charging dock 10a. The first electrode 11a of the charging dock 10a is the positive electrode, and the second electrode 12a of the charging dock 10a is the ground electrode. At this time, the discharge main circuit 15a refers to the circuit that completes the main functions of the charging dock 10a. For example, it can include a control chip, a power interface circuit, a voltage conversion circuit, etc., which are not limited here. Before the charging dock 10a receives a trigger signal, the positive electrode 11a is disconnected from the main circuit 15a. At this time, the main circuit 15a cannot provide an output voltage for the positive electrode, making the positive electrode not charged, which meets the industry requirements for the voltage of the exposed electrode. When the portable host 10b is docked with the charging dock 10a, the portable host 10b can provide a trigger signal for the control circuit 14a of the charging dock 10a to control the conduction of the controllable switch 13a of the charging dock 10a, so that the positive electrode 11a of the charging dock 10a is connected to the main circuit 15a. At this time, the exposed electrode of the charging dock 10a is blocked by the portable host 10b and will not be exposed to the air even if it is charged.

[0032] In one embodiment, please refer to Figure 3 and Figure 4 , the control circuit 14a of the charging dock 10a includes a Hall switch U1. The trigger signal of the Hall switch U1 is a magnetic force signal that can be provided by the portable host 10b. The power supply of the Hall switch U1 is provided by the main circuit 15a (such as the battery voltage). The Hall switch U1 controls the closing of the controllable switch 13a under the drive of the magnetic force signal.

[0033] In this embodiment, please refer to Figure 4, the control circuit 14a of the charging base 10a includes a Hall switch U1, a capacitor C1, and a resistor R1, and the controllable switch 13a is a MOS transistor. When the portable host 10b is installed on the charging base 11a, the magnetic signal of the portable host 10b is used to trigger the Hall switch U1 to turn on, so that the controllable switch 13b is closed, that is, the first electrode 11a of the charging base 10a is conducted with the main circuit 15a, and functions such as discharging are realized. When the portable host 10b is detached from the charging base 10a, the Hall switch U1 is turned off, the gate of the MOS transistor presents a high resistance, and the first electrode 11a is powered off without voltage.

[0034] In one embodiment, please refer to Figure 3 and Figure 5 , the control circuit 14b of the portable host 10b includes a Hall switch U2, and the trigger signal of the Hall switch U2 is a magnetic force signal that can be provided by the charging base 10a. When the portable host 10b is docked with the charging base 10a, the charging base 10a can provide a trigger signal and an electrical signal for the control circuit 14b of the portable host 10b. The power supply of the Hall switch U2 is connected from the positive electrode 12b of the portable host 10b to the charging base 10a to provide. The Hall switch U2 controls the controllable switch 13b to close under the drive of the magnetic force signal, so that the ground electrode 11b of the portable host 10b is connected to the main circuit 15b.

[0035] In one embodiment, please refer to Figure 5 , the control circuit 14b of the portable host 10b includes a Hall switch U2, a capacitor C3, a capacitor C4, a resistor R2, and a switching transistor Q1. The connection point FPC_GND is the ground electrode 11b of the portable host 10b, and the connection point GND is the system ground of the main circuit 15b. When the portable host 10b is docked with the charging base 10a, the magnetic force signal of the charging base 10a is used to trigger the Hall switch U2 to turn on, so that the switching transistor Q1 is turned on and the controllable switch 13b is closed, that is, the connection point GND is conducted with the connection point FPC_GND, and functions such as charging are realized. When the portable host 10b is detached from the charging base 10a, the Hall switch U2 is turned off, the gate of the switching transistor Q1 presents a high resistance, and external interferences such as ESD coming in from the connection point FPC_GND are blocked.

[0036] In another embodiment, please refer to Figure 3 and Figure 6 , the control circuit 14b of the portable host 10b includes a drive circuit, and the trigger signal is an electrical signal connected from the positive electrode 12b of the portable host 10b. The drive circuit controls the controllable switch 13b to close under the drive of the electrical signal.

[0037] In one embodiment, when the portable host 10b is docked with the charging base 10a, the trigger signal is provided by accessing the positive electrode 12b of the portable host 10b from the charging base 10a. The drive circuit includes an anti-backflow diode D1, a discharge tube TVS1, and a resistor R3. The positive electrode of the anti-backflow diode D1 is connected to the second electrode 12b, the negative electrode of the anti-backflow diode D1 is grounded through the discharge tube TVS1, and is also connected to the control terminal of the controllable switch 13 through the resistor R3. In this embodiment, the control circuit 14b of the portable host 10b can be directly driven by the voltage of the charging base 10a.

[0038] It can be seen that, referring to Figure 3 , when the portable host 10b is not installed on the charging base 10a for charging, the uncharged ground electrode 11b is controlled to be disconnected by the control circuit 14b (taking the Hall switch as an example), and when charging is required, it is connected to the charging base 10a. The magnetic force causes the Hall switch to drive the controllable switch 13b to be connected to conduct the ground electrode 11b. At this time, the ground electrode 11b is covered by the charging base 10a and the fuselage, and external static electricity cannot perform contact discharge. The controllable switch 13b can be a relay, a semiconductor switch tube, or a disconnect switch.

[0039] It can be understood that when the above protection circuit is applied in the signal acquisition device, that is, the signal acquisition device includes a mutually matching charging base 10a and / or portable host 10b, that is, according to actual requirements, the protection circuit can be set on both the charging base 10a and the portable host 10b at the same time or on one of them. The mutually matching charging base 10a and portable host 10b provide trigger signals for each other.

[0040] Please refer to Figure 3 , Figure 7 and Figure 8 , when the portable host 10b is docked with the charging base 10a, the first electrode 11b of the portable host 10b is in electrical contact with the second electrode 12a of the charging base 10a, and the second electrode 12b of the portable host 10b is in electrical contact with the first electrode 11a of the charging base 10a; the trigger signal received by the control circuit 14a in the charging base 10a is provided by the portable host 10b, and the trigger signal received by the control circuit 14b of the portable host 10b is provided by the charging base 10a; the first electrode 11a and the second electrode 12a of the charging base 10a are the positive electrode and the ground electrode respectively, and the first electrode 11b and the second electrode 12b of the portable host are the ground electrode and the positive electrode respectively.

[0041] When setting the protection circuit on the charging base 10a.

[0042] In one embodiment, please refer to Figure 3, the charging base 10a is provided with a first magnetic block 16 that is electromagnetically coupled to the ground electrode 12a of the charging base 10a. A magnetic conductive sheet 17 is provided on the portable host 10b. One end of the magnetic conductive sheet 17 is electromagnetically coupled to the ground electrode 11b of the portable host 10b, and the other end of the magnetic conductive sheet 17 extends toward the positive electrode 12b of the portable host 10b. The control circuit 14a on the charging base 10a is disposed on a side close to the positive electrode 11a. When the portable host 10b is docked with the charging base 10a, the other end of the magnetic conductive sheet 17 faces the control circuit 14a on the charging base 10a, so as to be able to provide an electromagnetic trigger signal for the Hall switch U1 of the control circuit 14a.

[0043] In another embodiment, please refer to Figure 7 , the charging base 10a is provided with a first magnetic block 16, and a second magnetic block 18 is provided on the portable host 10b. When the portable host 10b is docked with the charging base 10a, the second magnetic block 18 faces the control circuit 14a on the charging base 10a, so as to provide an electromagnetic trigger signal for the Hall switch U1 (please refer to Figure 4 ) of the control circuit 14a.

[0044] When a protection circuit is provided on the portable host 10b.

[0045] In one embodiment, please refer to Figure 7 , the control circuit 14 of the portable host 10b includes a Hall switch U1 disposed on one side of the ground electrode 11b. When the portable host 10b is docked with the charging base 10a, the first magnetic block 16 of the charging base 10a provides an electromagnetic trigger signal for the Hall switch U1 of the control circuit 14b of the portable host 10b.

[0046] In another embodiment, please refer to Figure 8 , the control circuit 14b of the portable host 10b includes a driving circuit. The input end of the driving circuit is connected to the positive electrode 12b, and the output end is connected to the control end of the controllable switch 13b of the portable host 10b. When the portable host 10b is docked with the charging base 10a, the trigger signal is an electrical signal input from the positive electrode of the charging base 10a, and the driving circuit controls the controllable switch 13b to close under the drive of the electrical signal.

[0047] It can be seen that when a protection circuit is provided on the charging base 10a and / or the portable host 10b, the charging base 10a and the portable host 10b will respectively provide trigger signals for each other to control the contact between the internal circuit and the exposed electrode. The trigger signal can be in various forms, such as the magnetic force signal and the electrical signal mentioned above. In other embodiments, it can also be a radio frequency signal, an induced voltage signal, etc.

[0048] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A signal acquisition device, characterized in that, The signal acquisition device includes a charging base and a portable host that match each other. A protection circuit is provided on the charging base and / or the portable host. The protection circuit is connected to the exposed electrodes. The exposed electrodes include a first electrode and a second electrode. One of the first electrode and the second electrode is a positive electrode, and the other is a ground electrode. The protection circuit includes a controllable switch, a control circuit configured to control the on / off of the controllable switch, and a main circuit configured to use or discharge electricity. One end of the controllable switch is connected to the first electrode, the other end of the controllable switch is connected to the main circuit, and the second electrode is connected to the main circuit. When the control circuit receives an externally input trigger signal, it controls the controllable switch to conduct, so that the first electrode is connected to the main circuit; When the portable host is docked with the charging base, the first electrode of the portable host is in electrical contact with the second electrode of the charging base, and the second electrode of the portable host is in electrical contact with the first electrode of the charging base; the trigger signal received by the control circuit in the charging base is provided by the portable host, and the trigger signal received by the control circuit of the portable host is provided by the charging base; The first electrode and the second electrode of the charging base are a first positive electrode and a first ground electrode respectively, and the first electrode and the second electrode of the portable host are a second ground electrode and a second positive electrode respectively.

2. The signal acquisition device according to claim 1, characterized in that The charging base is provided with a first magnetic block that is electromagnetically coupled to the first ground electrode. A magnetic conductive sheet is provided on the portable host. One end of the magnetic conductive sheet is electromagnetically coupled to the second ground electrode of the portable host. When the portable host is docked with the charging base, the other end of the magnetic conductive sheet faces the control circuit on the charging base to provide an electromagnetic trigger signal for the Hall switch of the control circuit.

3. The signal acquisition device according to claim 1 or 2, characterized in that The control circuit of the portable host includes a Hall switch provided on one side of the second ground electrode. When the portable host is docked with the charging base, the first magnetic block of the charging base provides an electromagnetic trigger signal for the Hall switch of the portable host.

4. The signal acquisition device according to claim 1, characterized in that The charging base is provided with a first magnetic block, and the portable host is provided with a second magnetic block. When the portable host is docked with the charging base, the first magnetic block faces the control circuit on the portable host to provide an electromagnetic trigger signal for the Hall switch of the control circuit on the portable host; the second magnetic block faces the control circuit on the charging base to provide an electromagnetic trigger signal for the Hall switch of the control circuit on the charging base.

5. The signal acquisition device according to claim 1, characterized in that, The control circuit of the portable host includes a drive circuit. The input end of the drive circuit is connected to the second positive electrode, and the output end is connected to the control end of the controllable switch of the portable host. When the portable host is docked with the charging base, the trigger signal is an electrical signal input from the second positive electrode, and the drive circuit controls the controllable switch to close under the drive of the electrical signal.

6. The signal acquisition device according to claim 1, characterized in that, The control circuit includes a Hall switch, the trigger signal is a magnetic force signal, and the Hall switch controls the controllable switch to close under the drive of the magnetic force signal.

7. The signal acquisition device according to claim 1, characterized in that The control loop includes a drive circuit, the trigger signal is an electrical signal accessed from the second electrode, and the drive circuit controls the controllable switch to close under the drive of the electrical signal.

8. The signal acquisition device according to claim 1, 6 or 7, characterized in that The controllable switch is a relay, a semiconductor switch tube or a disconnector.

9. The signal acquisition device according to claim 1, 6 or 7, characterized in that When the protection circuit is arranged in the portable host, the main loop is a charging loop, the first electrode is a ground electrode, and the second electrode is a positive electrode.

10. The signal acquisition device according to claim 1 or 6, characterized in that, When the protection circuit is arranged in the charging base, the main loop is a discharge main loop, the first electrode is a positive electrode, and the second electrode is a ground electrode.

Images