CN219436639U - Signal output protection circuit and internal circuit - Google Patents
Signal output protection circuit and internal circuit Download PDFInfo
- Publication number
- CN219436639U CN219436639U CN202222915470.3U CN202222915470U CN219436639U CN 219436639 U CN219436639 U CN 219436639U CN 202222915470 U CN202222915470 U CN 202222915470U CN 219436639 U CN219436639 U CN 219436639U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- transient diode
- diode tvs
- signal output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a signal output protection circuit and an internal circuit, which comprise a diode D1, a recoverable FUSE and a transient diode TVS. When the circuit works normally, the signal voltage output by the positive pole OUT+ of the input circuit and the negative pole OUT-of the input circuit is smaller than the action voltage of the transient diode TVS, so that the transient diode TVS has no current to flow, the normal working current of the circuit can be recovered to flow on the FUSE and the diode D1, and the circuit at the output end can work normally; when high voltage is connected to the positive pole OUT+ of the input circuit and the negative pole OUT-of the input circuit due to misoperation, the voltage is larger than the protection voltage of the transient diode TVS, the internal resistance of the transient diode TVS is increased along with time, the current is larger and larger, the heat generated by the large current flowing through the recoverable FUSE FUSE causes the polymeric resin to melt, the volume is rapidly increased, a high-resistance state is formed, the working current is rapidly reduced, and therefore the circuit is limited and protected.
Description
Technical Field
The utility model relates to the field of electricity, in particular to a signal output protection circuit and an internal circuit.
Background
The electrical equipment is easy to age due to the fact that the voltage is too high, the service life is reduced, electric appliances can be seriously burnt out, even fire disasters can be caused, and economic losses are caused.
For example, regulations prescribe that the normal voltage of a transformer in operation cannot exceed 5% of rated voltage, the excessive voltage can cause over-excitation and severe saturation of an iron core, the iron core and metal clamping pieces thereof generate high temperature due to the increase of magnetic leakage, and the insulation of the transformer is damaged and the components are deformed locally when severe, so that the service life of the transformer is shortened; and reactive compensation equipment such as a parallel capacitor and the like can not be put into operation under high voltage, so that the economic benefit is reduced (the long-term overvoltage of the capacitor is not more than 10%).
Disclosure of Invention
In order to solve the above technical problems, the present utility model provides a signal output protection circuit, which includes a recoverable FUSE, wherein one side of the recoverable FUSE is connected with an anode of a diode D1; the other side of the recoverable FUSE is connected with the cathode of the transient diode TVS; the cathode of the diode D1 and the anode of the transient diode TVS are connected to an input circuit.
Preferably: the input circuit negative pole OUT-is connected to the positive pole of the transient diode TVS.
Preferably: the positive pole OUT+ of the input circuit is connected with the negative pole of the diode D1.
Preferably: the transient diode TVS may be a 24V withstand voltage.
Preferably: the FUSE can be rated at 250V and 80mA.
Preferably: when the voltage of the input circuit is smaller than the withstand voltage of the transient diode TVS, the protection circuit works normally.
Preferably: when the input circuit voltage is greater than the withstand voltage of the transient diode TVS, the transient diode TVS is open-circuited and the recoverable FUSE is blown.
An internal circuit adapted for use in the protection circuit of any one of the preceding claims.
Preferably: a transient diode TVS is connected in parallel with the internal circuit.
Preferably: the internal circuit output maximum voltage is 36V.
The utility model has the technical effects and advantages that:
when the front end of the original circuit is added with a protection circuit, the voltage is larger than the protection voltage of the transient diode TVS when the high voltage is accessed due to misoperation, the internal resistance of the transient diode TVS is increased along with time and is smaller, the current is larger and larger, the heat generated by the large current flowing through the recoverable FUSE FUSE causes the polymeric resin to melt, the volume is rapidly increased to form a high-resistance state, the working current is rapidly reduced, and therefore the circuit is limited and protected, and the circuit failure caused by the damage of the original circuit and devices after the high voltage is accessed to the output end of the circuit is effectively prevented.
Drawings
Fig. 1 is a circuit diagram of signal output protection according to an embodiment of the present application.
Detailed Description
The utility model will be described in further detail with reference to the drawings and the detailed description. The embodiments of the utility model have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the utility model in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, and to enable others of ordinary skill in the art to understand the utility model for various embodiments with various modifications as are suited to the particular use contemplated.
Referring to fig. 1, in this embodiment, a signal output protection circuit is provided, which includes a diode D1, a recoverable FUSE and a transient diode TVS, wherein one side of the recoverable FUSE is connected to the positive electrode of the diode D1, the other side of the recoverable FUSE is connected to the negative electrode of the transient diode TVS, the negative electrode of the diode D1 and the positive electrode of the transient diode TVS are connected to an input circuit, the positive electrode of the transient diode TVS is connected to the negative electrode OUT-, the negative electrode of the diode D1 is connected to the positive electrode out+ of the input circuit, and the transient diode TVS is connected in parallel with an internal circuit.
Diode D1 is an electronic device made of semiconductor material; the diode has unidirectional conductivity, namely, when forward voltage is applied to the anode of the diode, the diode is conducted; when reverse voltages are applied to the anode and cathode, the diode turns off; therefore, the on and off of the diode corresponds to the on and off of the switch; in the present embodiment, the diode D1 is used to prevent the external circuit from being connected in error to damage the internal circuit.
The recoverable FUSE is composed of specially treated polymeric resin and conductive particles distributed therein; under normal operation, the polymeric resin tightly binds the conductive particles outside the crystalline structure to form a chain-shaped conductive electric path, the recoverable fuse at the moment is in a low-resistance state, and the heat energy generated by the current flowing through the recoverable fuse on the line is small, so that the crystalline structure is not changed; when the circuit is short-circuited or overloaded, the heat generated by the large current flowing through the recoverable fuse melts the polymeric resin, the volume is rapidly increased, a high-resistance state is formed, and the working current is rapidly reduced, so that the circuit is limited and protected; in this embodiment, the recoverable FUSE is rated at 250V and 80mA for limiting the current drawn by the positive pole out+ of the input circuit.
The transient diode TVS is a high-efficiency protection device in the form of a diode; when the two poles of the TVS diode are impacted by reverse transient high energy, the high resistance between the two poles is changed into low resistance at the speed of the magnitude of minus 12 seconds of 10, and the surge power of thousands of watts is absorbed, so that the voltage clamp between the two poles is positioned at a preset value, thereby effectively protecting precise components in an electronic circuit from being damaged by various surge pulses; in this embodiment, the output maximum voltage of the internal circuit is 36V, and the transient diode TVS uses a voltage resistance of 24V to limit the voltage between two terminals, so as to protect the internal circuit from being high voltage connected when the small signal circuit is connected to the external high voltage, and avoid damage.
The working principle of the utility model is as follows:
in the first state, the circuit works normally, the signal voltage output by the positive pole OUT+ of the input circuit and the negative pole OUT-of the input circuit is smaller than the action voltage of the transient diode TVS, so that the transient diode TVS has no current to flow, the normal working current of the circuit can be recovered to flow on the FUSE and the diode D1, and the circuit at the output end can work normally;
in the second state, the positive pole OUT+ of the input circuit and the negative pole OUT-of the input circuit are connected with high voltage due to misoperation, the voltage is larger than the protection voltage of the transient diode TVS, the internal resistance of the transient diode TVS is reduced along with the increase of time, the current is larger and larger, the heat generated by the large current flowing through the recoverable FUSE melts the polymeric resin, the volume is rapidly increased, a high-resistance state is formed, and the working current is rapidly reduced, so that the circuit is limited and protected.
It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art and which are included in the embodiments of the present utility model without the inventive step, are intended to be within the scope of the present utility model. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.
Claims (10)
1. The signal output protection circuit comprises a recoverable FUSE, and is characterized in that one side of the recoverable FUSE is connected with the anode of a diode D1;
the other side of the recoverable FUSE is connected with the cathode of the transient diode TVS;
the cathode of the diode D1 and the anode of the transient diode TVS are connected to an input circuit.
2. A signal output protection circuit according to claim 1, wherein the input circuit cathode OUT-is connected to the positive pole of the transient diode TVS.
3. A signal output protection circuit according to claim 2, wherein the input circuit positive pole out+ is connected to the negative pole of the diode D1.
4. The signal output protection circuit according to claim 1, wherein the transient diode TVS is capable of withstanding voltage of 24V.
5. A signal output protection circuit according to claim 1, wherein the voltage rating of the recoverable FUSE is 250V and the current rating is 80mA.
6. The signal output protection circuit according to claim 1, wherein the protection circuit operates normally when the input circuit voltage is less than the withstand voltage of the transient diode TVS.
7. The signal output protection circuit according to claim 1, wherein said transient diode TVS is open-circuited and said recoverable FUSE is blown when said input circuit voltage is greater than a withstand voltage of said transient diode TVS.
8. An internal circuit, characterized in that it is adapted to a protection circuit as claimed in any one of the preceding claims 1-7.
9. An internal circuit according to claim 8, characterized in that a transient diode TVS is connected in parallel with the internal circuit.
10. An internal circuit according to claim 9, wherein the internal circuit outputs a maximum voltage of 36V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222915470.3U CN219436639U (en) | 2022-11-02 | 2022-11-02 | Signal output protection circuit and internal circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222915470.3U CN219436639U (en) | 2022-11-02 | 2022-11-02 | Signal output protection circuit and internal circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219436639U true CN219436639U (en) | 2023-07-28 |
Family
ID=87332327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222915470.3U Active CN219436639U (en) | 2022-11-02 | 2022-11-02 | Signal output protection circuit and internal circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219436639U (en) |
-
2022
- 2022-11-02 CN CN202222915470.3U patent/CN219436639U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107342754B (en) | Direct current breaker based on coupling inductance coil and control method thereof | |
| TWI606665B (en) | Fast switch fault current limiter and current limiter system | |
| CN202333771U (en) | Power supply protection circuit and engineering machinery | |
| RU2592640C2 (en) | Linear dc voltage protective automatic device | |
| CN103618286B (en) | Transient over-voltage protection circuit | |
| US10756537B2 (en) | Short circuit fault current limiter | |
| US5157572A (en) | Apparatus suitable for use in protecting electrical installations from transients | |
| CN211908364U (en) | Multistage lightning surge protection circuit for direct-current power supply of product in power industry | |
| CN109066600B (en) | A kind of current limliting capacitance-resistance branch, resistance-capacitance type dc circuit breaker and parameter selection method | |
| JP2021526784A (en) | Multi-stage protection device for overcurrent and overvoltage protected transfer of electrical energy | |
| CN219436639U (en) | Signal output protection circuit and internal circuit | |
| CN206379875U (en) | Surge protection circuit for locomotive dc source electrical equipment | |
| CN113992082B (en) | Combined de-excitation resistor circuit | |
| CN109950878A (en) | One kind is for DC/DC converter self- recoverage protection circuit and over-voltage protection method | |
| CN111064172A (en) | Protection circuit and variable pitch system | |
| Kim et al. | Arc extinguishment for DC circuit breaker by PPTC device | |
| CN212588082U9 (en) | Power supply circuit applying overvoltage protector | |
| CN201007991Y (en) | Short circuit, overload safeguard for transistor output | |
| CN212783118U (en) | On-load voltage regulating switch with explosion-proof protection device | |
| CN219106059U (en) | Tripping device and overvoltage and overcurrent protection device | |
| WO2013139382A1 (en) | Current control apparatus | |
| CN111276954B (en) | Self-adaptive fault current limiter | |
| CN219018458U (en) | Power supply self-cutting protection circuit and electronic equipment | |
| CN217984509U (en) | Transformer protection circuit and multi-output flyback circuit | |
| CN218549488U (en) | OPP protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |