CN210867189U - Protection circuit and signal acquisition device - Google Patents
Protection circuit and signal acquisition device Download PDFInfo
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- CN210867189U CN210867189U CN201921676465.3U CN201921676465U CN210867189U CN 210867189 U CN210867189 U CN 210867189U CN 201921676465 U CN201921676465 U CN 201921676465U CN 210867189 U CN210867189 U CN 210867189U
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Abstract
A protection circuit and signal acquisition device, with bare electrodes: the protection circuit comprises a controllable switch, a control loop and a main loop, wherein the control loop is configured to control the on-off of the controllable switch, the main loop is configured to be powered or discharged, one end of the controllable switch is connected with the first electrode, the other end of the controllable switch is connected with the main loop, the second electrode is connected with the main loop, and the control loop controls the on-off of the controllable switch when receiving a trigger signal input from the outside. When an external trigger signal is not received, the exposed electrode of the electronic equipment is disconnected with the main loop, so that the exposed electrode is not electrified, the human body or other equipment is prevented from being damaged by electric leakage, and the requirement of the industry on the voltage of the exposed electrode is met; in addition, if the exposed electrode is contacted with high-voltage static electricity, the high-voltage static electricity cannot be directly conducted to the main loop, so that the static damage of components is caused.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a protection circuit and a signal acquisition device.
Background
Currently, for medical detection, communication environment, and medical instrument safety, it is required that the exposed electrode of a medical instrument, such as a charging device, is charged not to exceed a required voltage. In addition, the ground electrode charged by the wearable device is communicated with an internal circuit, and is easily conducted to other common ground devices to cause electrostatic damage when high-voltage static electricity such as contact discharge of more than 8kv is generated.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a protection circuit and a signal acquisition device, and aims to solve the problems of the electrification requirement of a bare electrode of the signal acquisition device and the electrostatic damage.
A first aspect of the embodiments of the present application provides a protection circuit, an exposed electrode includes 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, and includes a controllable switch, a control loop configured to control on/off of the controllable switch, and a main loop configured to power on 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 loop, the second electrode is connected to the main loop, and when receiving a trigger signal input from outside, the control loop controls the controllable switch to be turned on, so that the first electrode is communicated to the main loop.
In one embodiment, the control circuit includes a hall switch, the trigger signal is a magnetic signal, and the hall switch controls the controllable switch to close under the driving of the magnetic signal.
In one embodiment, the control circuit includes a driving circuit, the trigger signal is an electrical signal received from the second electrode, and the driving circuit controls the controllable switch to close under the driving of the electrical signal.
In one embodiment, the controllable switch is a relay, a thyristor or a disconnector.
In one embodiment, when the protection circuit is configured with 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.
In one embodiment, when the protection circuit is disposed in a charging seat, the main circuit is a discharge main circuit, the first electrode is a positive electrode, and the second electrode is a ground electrode.
A second aspect of the embodiments of the present application provides a signal acquisition device, where the signal acquisition device includes a charging seat and/or a portable host that are matched with each other, the charging seat and/or the portable host are provided with the above-mentioned protection circuit, when the portable host is connected to the charging seat, a first electrode of the portable host is in electrical contact with a second electrode of the charging seat, and the second electrode of the portable host is in electrical contact with the first electrode of the charging seat; the trigger signal received by the control loop in the charging seat is provided by the portable host, and the trigger signal received by the control loop of the portable host is provided by the charging seat; the first electrode and the second electrode of the charging seat are respectively a first positive electrode and a first ground electrode, and the first electrode and the second electrode of the portable host are respectively a second ground electrode and a second positive electrode.
In one embodiment, the charging seat is provided with a first magnetic block electromagnetically coupled with the first ground electrode, the portable host is provided with a magnetic conductive sheet, one end of the magnetic conductive sheet is electromagnetically coupled with the second ground electrode of the portable host, and when the portable host is in butt joint with the charging seat, the other end of the magnetic conductive sheet is opposite to the control loop on the charging seat so as to provide an electromagnetic trigger signal for the hall switch of the control loop.
In one embodiment, the control circuit of the portable host includes a hall switch disposed on one side of the second ground electrode, and when the portable host is docked with the charging dock, the first magnetic block of the charging dock provides an electromagnetic trigger signal for the hall switch of the portable host.
In one embodiment, the charging seat is provided with a first magnetic block, the portable host is provided with a second magnetic block, and when the portable host is in butt joint with the charging seat, the first magnetic block is opposite to a control loop on the portable host so as to provide an electromagnetic trigger signal for a hall switch of the control loop on the portable host; the second magnetic block is opposite to the control loop on the charging seat so as to provide an electromagnetic trigger signal for a Hall switch of the control loop on the charging seat.
In one embodiment, the control circuit of the portable host includes a driving circuit, an input end of the driving circuit is connected to the second positive electrode, an output end of the driving circuit is connected to a control end of a controllable switch of the portable host, when the portable host is docked with the charging dock, the trigger signal is an electrical signal accessed from the second positive electrode, and the driving circuit controls the controllable switch to be closed under the driving of the electrical signal.
The protection circuit is connected with the main loop and the on-off of the electrode through the controllable switch, and when an external trigger signal is not received, the exposed electrode of the electronic equipment is disconnected with the main loop, so that the exposed electrode is not electrified, the human body or other equipment is prevented from being damaged by electric leakage, and the voltage requirement of the industry on the exposed electrode is met; in addition, if the exposed electrode is contacted with high-voltage static electricity, the high-voltage static electricity cannot be directly conducted to the main loop, so that the static electricity damage of components is caused.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a protection circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a protection circuit according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a portable device including the circuit shown in fig. 1 or fig. 2 and a charging dock according to a first embodiment of the present application;
FIG. 4 is a circuit schematic diagram of a first embodiment of a control loop in the protection circuit shown in FIG. 1 or FIG. 2;
FIG. 5 is a circuit schematic diagram of a second embodiment of a control loop in the protection circuit shown in FIG. 1 or FIG. 2;
FIG. 6 is a circuit schematic diagram of a third embodiment of a control loop in the protection circuit shown in FIG. 1 or FIG. 2;
fig. 7 is a schematic structural diagram of a portable device including the circuit shown in fig. 1 or fig. 2 being docked with a cradle according to a second embodiment of the present application;
fig. 8 is a schematic structural diagram of a portable device including the circuit shown in fig. 1 or fig. 2 and a charging dock according to a third embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 and fig. 2, a protection circuit provided in an embodiment of the present application is connected to an exposed electrode, where the exposed 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 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 a trigger signal input from outside, the controllable switch 13 is controlled to be turned on, so that the first electrode 11 is communicated with the main circuit 15.
The protection circuit is connected with the on-off of the main loop 15 and the exposed electrode 11 through the arrangement of the controllable switch 13, when an external trigger signal is not received, the electrode 11 of the electronic equipment is disconnected with the main loop 15, so that the exposed electrode 11 is not electrified, the human body or other equipment is prevented from being damaged by electric leakage, and the requirements of the industry on the voltage of the exposed electrode are met; in addition, if the exposed electrode 11 is exposed to high-voltage static electricity, the high-voltage static electricity is not directly conducted to the main circuit 15, and electrostatic damage of components is caused.
Referring to fig. 3, the 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 a ground electrode, and the second electrode 12b of the portable host 10b is a positive electrode. The charging circuit 15b is a circuit that performs the main functions of the portable host 10b, and may include, for example, a control chip, a power supply circuit, a functional circuit and a battery, where the functional circuit is set according to different functions of the portable host 10b, such as a display, a communication circuit, an interface circuit, and the like, and is not limited herein. Before the portable host 10b does not receive the trigger signal, the ground electrode 11b is disconnected from the main circuit 15b, specifically, is disconnected from the ground end of the main circuit 15b, and even if the ground electrode 11b contacts high-voltage static electricity, the high-voltage static electricity is not conducted to the main circuit 15b, thereby causing electrostatic damage to components.
Referring to fig. 3, the protection circuit can be applied to a charging socket 10a for charging a portable host 10b, the main circuit is a discharging main circuit 15a of the charging socket 10a, a first electrode 11a of the charging socket 10a is a positive electrode, and a second electrode 12a of the charging socket 10a is a ground electrode. The discharge main circuit 15a is a circuit that performs the main functions of the charging dock 10a, and may include, for example, a control chip, a power interface circuit, a voltage conversion circuit, and the like, which is not limited herein. Before the charging stand 10a does not receive the trigger signal, the positive electrode 11a is disconnected from the main circuit 15a, and at this time, the main circuit 15a cannot provide an output voltage for the positive electrode, so that the positive electrode is not electrified, and the requirement of the industry on the voltage of the exposed electrode is met. When the portable host 10b is connected to the charging seat 10a, the portable host 10b can provide a trigger signal to the control circuit 14a of the charging seat 10a to control the conduction of the controllable switch 13a of the charging seat 10a, so that the positive electrode 11a of the charging seat 10a is communicated with the main circuit 15a, and at this time, the exposed electrode of the charging seat 10a is shielded by the portable host 10b, and even if the charged electrode is charged, the exposed electrode cannot be exposed in the air.
In one embodiment, referring to fig. 3 and 4, the control circuit 14a of the charging dock 10a includes a hall switch U1, the triggering signal of the hall switch U1 is a magnetic 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 (e.g., battery voltage), and the hall switch U1 controls the controllable switch 13a to close under the driving of the magnetic signal.
In this embodiment, referring to fig. 4, the control loop 14a of the charging dock 10a includes a hall switch U1, a capacitor C1, and a resistor R1, and the controllable switch 13a is an MOS transistor. When the portable host 10b is mounted on the charging seat 11a, the hall switch U1 is triggered to open by the magnetic signal of the portable host 10b, so that the controllable switch 13b is closed, i.e. the first electrode 11a of the charging seat 10a is conducted with the main circuit 15a, thereby realizing the functions of discharging, etc. When the portable host 10b is detached from the charging seat 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 and has no voltage.
In one embodiment, referring to fig. 3 and 5, the control circuit 14b of the portable host 10b includes a hall switch U2, the trigger signal of the hall switch U2 is a magnetic signal provided by the charging dock 10a, when the portable host 10b is docked with the charging dock 10a, the charging dock 10a can provide the 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 provided by the positive electrode 12b of the portable host 10b being connected from the charging dock 10a, and the hall switch U2 controls the controllable switch 13b to close under the driving of the magnetic signal, so that the ground electrode 11b of the portable host 10b is communicated with the main circuit 15 b.
In one embodiment, referring to fig. 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 switch Q1, and the connection point FPC _ GND, i.e., the ground electrode 11b of the portable host 10b, is the system ground of the main circuit 15 b. When the portable host 10b is connected with the charging seat 10a, the magnetic signal of the charging seat 10a is used for triggering the hall switch U2 to be opened, so that the switch tube Q1 is conducted, the controllable switch 13b is closed, namely, the connection point GND is conducted with the connection point FPC _ GND, functions of charging and the like are realized, when the portable host 10b is disconnected from the charging seat 10a, the hall switch U2 is closed, the grid of the switch tube Q1 presents high resistance, and external interference such as ESD and the like coming from the connection point FPC _ GND is blocked.
In another embodiment, referring to fig. 3 and 6, the control circuit 14b of the portable host 10b includes a driving circuit, and the triggering signal is an electric signal received from the positive electrode 12b of the portable host 10b, and the driving circuit controls the controllable switch 13b to close under the driving of the electric signal.
In one embodiment, when the portable host 10b is docked with the cradle 10a, the trigger signal is provided by the positive electrode 12b of the portable host 10b being connected from the cradle 10a, the driving circuit includes a back-flow prevention diode D1, a drain tube TVS1 and a resistor R3, the positive electrode of the back-flow prevention diode D1 is connected to the second electrode 12b, the negative electrode of the back-flow prevention diode D1 is grounded through the drain tube TVS1, and is also connected to the control terminal of the controllable switch 13 through the resistor R3. In this embodiment, the control loop 14b of the portable host 10b can be directly driven by the voltage of the charging dock 10 a.
As can be seen from fig. 3, when the portable host 10b is not installed on the charging seat 10a for charging, the uncharged ground electrode 11b is controlled by the control circuit 14b (taking a hall switch as an example) to be disconnected, and is connected to the charging seat 10a when charging is required, the hall switch is driven by magnetic force to connect the controllable switch 13b to conduct the ground electrode 11b, and at this time, the ground electrode 11b is covered by the charging seat 10a and the body, and external static electricity cannot perform contact discharge. The controllable switch 13b may be a relay, a thyristor or a disconnector.
It can be understood that, when the above-mentioned protection circuit is applied in a signal acquisition device, that is, the signal acquisition device includes the charging seat 10a and/or the portable host 10b matched with each other, it is possible to set a protection circuit on both or one of the charging seat 10a and the portable host 10b according to actual requirements, and the matched charging seat 10a and the portable host 10b provide trigger signals for each other.
Referring to fig. 3, 7 and 8, when the portable host 10b is connected to the charging base 10a, the first electrode 11b of the portable host 10b is electrically connected to the second electrode 12a of the charging base 10a, and the second electrode 12b of the portable host 10b is electrically connected to the first electrode 11a of the charging base 10 a; the trigger signal received by the control loop 14a of the charging stand 10a is provided by the portable host 10b, and the trigger signal received by the control loop 14b of the portable host 10b is provided by the charging stand 10 a; the first electrode 11a and the second electrode 12a of the charging base 10a are respectively a positive electrode and a ground electrode, and the first electrode 11b and the second electrode 12b of the portable host are respectively a ground electrode and a positive electrode.
When the protection circuit is mounted on the charging cradle 10 a.
In one embodiment, referring to fig. 3, the charging base 10a is provided with a first magnetic block 16 electromagnetically coupled to the ground electrode 12a of the charging base 10a, the portable host 10b is provided with a magnetic conductive sheet 17, one end of the magnetic conductive sheet 17 is electromagnetically coupled to the ground electrode 11b of the portable host 10b, the other end of the magnetic conductive sheet 17 extends toward the positive electrode 12b of the portable host 10b, the control loop 14a of the charging base 10a is disposed at a side close to the positive electrode 11a, and when the portable host 10b is docked with the charging base 10a, the other end of the magnetic conductive sheet 17 is opposite to the control loop 14a of the charging base 10a, so as to provide an electromagnetic trigger signal for the hall switch U1 of the control loop 14 a.
In another embodiment, referring to fig. 7, the charging base 10a is provided with a first magnetic block 16, the portable host 10b is provided with a second magnetic block 18, and when the portable host 10b is connected to the charging base 10a, the second magnetic block 18 is opposite to the control circuit 14a on the charging base 10a, so as to provide an electromagnetic trigger signal for the hall switch U1 (see fig. 4) of the control circuit 14 a.
When a protection circuit is provided on the portable host computer 10 b.
In one embodiment, referring to fig. 7, the control circuit 14 of the portable host 10b includes a hall switch U1 disposed on one side of the ground electrode 11b, and when the portable host 10b is connected to the charging dock 10a, the first magnetic block 16 of the charging dock 10a provides an electromagnetic trigger signal for the hall switch U1 of the control circuit 14b of the portable host 10 b.
In another embodiment, referring to fig. 8, the control circuit 14b of the portable host 10b includes a driving circuit, an input end of the driving circuit is connected to the positive electrode 12b, an output end of the driving circuit is connected to a control end of the controllable switch 13b of the portable host 10b, when the portable host 10b is connected to the charging dock 10a, the trigger signal is an electrical signal connected from the positive electrode of the charging dock 10a, and the driving circuit controls the controllable switch 13b to be closed under the driving of the electrical signal.
It can be seen that when the protection circuit is disposed on the charging seat 10a and/or the portable host 10b, the charging seat 10a and the portable host 10b respectively provide a trigger signal for controlling the contact between the internal circuit and the exposed electrode for the other party, and the trigger signal may be in various forms, such as the above-mentioned magnetic signal, electric signal, and in other embodiments, may also be a wireless radio frequency signal, an induced voltage signal, and the like.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (11)
1. A protection circuit is connected with an exposed electrode, the exposed electrode comprises a first electrode and a second electrode, one of the first electrode and the second electrode is a positive electrode, and the other electrode is a ground electrode.
2. The protection circuit of claim 1, wherein the control loop comprises a hall switch, the trigger signal is a magnetic signal, and the hall switch is driven by the magnetic signal to control the controllable switch to close.
3. The protection circuit of claim 1, wherein the control loop includes a driving circuit, the trigger signal is an electrical signal received from the second electrode, and the driving circuit controls the controllable switch to close under the driving of the electrical signal.
4. A protection circuit according to any one of claims 1 to 3, wherein the controllable switch is a relay, a thyristor or a disconnector.
5. The protection circuit according to any one of claims 1 to 3, wherein 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.
6. The protection circuit according to claim 1 or 2, wherein when the protection circuit is disposed in a charging stand, the main circuit is a main discharge circuit, the first electrode is a positive electrode, and the second electrode is a ground electrode.
7. A signal acquisition device, characterized in that, the signal acquisition device includes a charging seat and/or a portable host matched with each other, the charging seat and/or the portable host is provided with a protection circuit as claimed in any one of claims 1 to 5, when the portable host is connected with the charging seat, a first electrode of the portable host is electrically contacted with a second electrode of the charging seat, the second electrode of the portable host is electrically contacted with the first electrode of the charging seat; the trigger signal received by the control loop in the charging seat is provided by the portable host, and the trigger signal received by the control loop of the portable host is provided by the charging seat; the first electrode and the second electrode of the charging seat are respectively a first positive electrode and a first ground electrode, and the first electrode and the second electrode of the portable host are respectively a second ground electrode and a second positive electrode.
8. The signal acquisition device as claimed in claim 7, wherein the charging seat is provided with a first magnetic block electromagnetically coupled to the first ground electrode, the portable host is provided with a magnetic conductive sheet, one end of the magnetic conductive sheet is electromagnetically coupled to the second ground electrode of the portable host, and when the portable host is docked with the charging seat, the other end of the magnetic conductive sheet is opposite to the control loop on the charging seat, so as to provide an electromagnetic trigger signal for the hall switch of the control loop.
9. The signal acquisition device as claimed in claim 8, wherein the control circuit of the portable host comprises a hall switch disposed at one side of the second ground electrode, and when the portable host is connected to the charging seat, the first magnetic block of the charging seat provides an electromagnetic trigger signal for the hall switch of the portable host.
10. The signal acquisition device as claimed in claim 7, wherein the charging seat is provided with a first magnetic block, the portable host is provided with a second magnetic block, and when the portable host is in butt joint with the charging seat, the first magnetic block is opposite to a control loop on the portable host so as to provide an electromagnetic trigger signal for a Hall switch of the control loop on the portable host; the second magnetic block is opposite to the control loop on the charging seat so as to provide an electromagnetic trigger signal for a Hall switch of the control loop on the charging seat.
11. The signal acquisition device as claimed in claim 7, wherein the control loop of the portable host comprises a driving circuit, an input terminal of the driving circuit is connected to the second positive electrode, an output terminal of the driving circuit is connected to a control terminal of the controllable switch of the portable host, when the portable host is docked with the charging dock, the triggering signal is an electrical signal accessed from the second positive electrode, and the driving circuit controls the controllable switch to be closed under the driving of the electrical signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921676465.3U CN210867189U (en) | 2019-10-08 | 2019-10-08 | Protection circuit and signal acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921676465.3U CN210867189U (en) | 2019-10-08 | 2019-10-08 | Protection circuit and signal acquisition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210867189U true CN210867189U (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921676465.3U Active CN210867189U (en) | 2019-10-08 | 2019-10-08 | Protection circuit and signal acquisition device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210867189U (en) |
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2019
- 2019-10-08 CN CN201921676465.3U patent/CN210867189U/en active Active
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