CN109088391B - Short-circuit protection circuit and nonstandard POE power supply - Google Patents
Short-circuit protection circuit and nonstandard POE power supply Download PDFInfo
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- CN109088391B CN109088391B CN201811085792.1A CN201811085792A CN109088391B CN 109088391 B CN109088391 B CN 109088391B CN 201811085792 A CN201811085792 A CN 201811085792A CN 109088391 B CN109088391 B CN 109088391B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
A short-circuit protection circuit and nonstandard POE controller, the short-circuit protection circuit comprising: the charging device comprises a first electronic switch, a charging sub-circuit, a second electronic switch and a resistor R5, wherein the control end of the second electronic switch is connected with the resistor R5, the resistor R5 is used for being connected with the power input end through a resistor R4, the resistor R5 is also connected with the positive electrode of a diode D1, the negative electrode of the diode D1 is used for being connected with the power output end, the first end of the second electronic switch is connected with the control end of the first electronic switch, and the second end of the second electronic switch is used for being grounded; the charging sub-circuit is used for being connected with the power input end through a resistor R1, and is also connected with the control end of the first electronic switch; the first end of the first electronic switch is used for being connected with the power input end, and the second end of the first electronic switch is used for being connected with the power output end. The short-circuit protection circuit and the nonstandard POE power supply device avoid the problem that products are easy to damage when the short-circuit phenomenon occurs in the circuit of the products.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a short-circuit protection circuit and a nonstandard power supply.
Background
The POE power supply technology can provide dc power for some IP-based terminals (such as IP phones, wireless lan access points AP, webcams, network access control, patrol readers, etc.) while transmitting data signals without any modification to the existing ethernet wiring infrastructure.
In practical applications, because POE implementing standard protocols is costly, on the other hand, in some applications it is desirable to use power in excess of the standard-defined requirements, which require the use of large amounts of non-standard POE products. In order to reduce the cost, the protocol control chip of the standard POE product is not adopted, so that when the short circuit phenomenon occurs, power is consumed only through PTC (Positive Temperature Coefficient, thermistor) in the standard POE product to reduce the voltage of a power receiving end, the problem that the PTC resistor burns out easily occurs after a certain time, the POE product is damaged and cannot be recovered, or a fuse mode is directly adopted, and when the short circuit condition occurs, the fuse is directly fused, and the POE is damaged.
Disclosure of Invention
Based on the above, it is necessary to provide a short-circuit protection circuit and a nonstandard POE power supply for solving the problem that when a short-circuit phenomenon occurs in nonstandard POE products, the POE products are easily damaged.
A short circuit protection circuit comprising: the electronic device comprises a first electronic switch and a switch control circuit, wherein the switch control circuit comprises a charging sub-circuit and a switch sub-circuit; the switch sub-circuit comprises a second electronic switch and a resistor R5, wherein the control end of the second electronic switch is connected with the first end of the resistor R5, the second end of the resistor R5 is used for being connected with the power input end through a resistor R4, the second end of the resistor R5 is also connected with the positive electrode of a diode D1, the negative electrode of the diode D1 is used for being connected with the power output end, the first end of the second electronic switch is connected with the control end of the first electronic switch, and the second end of the second electronic switch is used for being grounded; the first end of the charging sub-circuit is connected with the power input end through a resistor R1, the first end of the charging sub-circuit is also connected with the control end of the first electronic switch, and the second end of the charging sub-circuit is grounded; the first end of the first electronic switch is used for being connected with the power input end, and the second end of the first electronic switch is used for being connected with the power output end.
In one embodiment, the charging subcircuit includes a capacitor C1 and a resistor R3 in series.
In one embodiment, the control terminal of the first electronic switch is connected to the first terminal of the charging sub-circuit and the first terminal of the second electronic switch through a resistor R2, respectively.
In one embodiment, the control terminal of the second electronic switch is further configured to be grounded through a resistor R6.
In one embodiment, the first electronic switch is a MOS transistor.
In one embodiment, the first electronic switch is a PMOS transistor, a gate of the PMOS transistor is connected to the first end of the charging sub-circuit and the first end of the second electronic switch, a source of the PMOS transistor is connected to the power input terminal, and a drain of the PMOS transistor is connected to the power output terminal.
In one embodiment, the second electronic switch is a triode.
In one embodiment, the second electronic switch is an NPN triode, a base of the NPN triode is connected to the first end of the resistor R5, a collector of the NPN triode is connected to the control end of the first electronic switch, and an emitter of the NPN triode is connected to ground.
In one embodiment, the cathode of the diode D1 is used to connect to the power output terminal through an inductor.
A non-standard POE power supply comprising a short-circuit protection circuit as in any one of the embodiments above.
The short-circuit protection circuit and the nonstandard POE power supply are characterized in that a first electronic switch is arranged between a power input end and a power output end, a charging sub-circuit and a switching sub-circuit are respectively arranged and connected with a control end of the first electronic switch, a first end of the charging sub-circuit is connected with the power input end through a resistor R1, and the switching sub-circuit is connected with the power input end through a resistor R4; in this way, after power-on, as the power input end does not charge the charging sub-circuit, the control end of the first electronic switch is in low level to enable the first electronic switch to be conducted, so that the power input end and the power output end are conducted, and the power output end outputs power; then, on the one hand, if the power output end can normally supply power to the equipment, the power input end outputs current to the switch sub-circuit, the voltage of the control end of the second electronic switch is larger than the conduction voltage of the second electronic switch, so that the control end of the first electronic switch is continuously low-level to conduct the first electronic switch, the power input end and the power output end are conducted, and the power output end outputs power, on the other hand, if the equipment end connected with the power output end is short-circuited, the voltage of the power output end is reduced, after the voltage of the power output end is reduced to a certain extent, the voltage of the control end of the second electronic switch is smaller than the conduction voltage of the second electronic switch to cut off the second electronic switch, at the moment, the power input end charges the charging sub-circuit through the resistor R1, the charging sub-circuit is fully charged in a short time, the control end of the first electronic switch is high-level to turn off the first electronic switch, the power input end and the power output end stops outputting power. When the short circuit phenomenon occurs in the circuit connected with the power output end, the power input end and the power output end can be disconnected, the power is turned off, and the problem that the product is damaged easily when the short circuit phenomenon occurs in the circuit of the product connected with the power output end is avoided.
Drawings
FIG. 1 is a schematic block diagram of a short-circuit protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a short-circuit protection circuit according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention provides a short-circuit protection circuit, as a possible implementation manner, as shown in fig. 1, the short-circuit protection circuit includes a first electronic switch 100 and a switch control circuit, wherein the switch control circuit includes a charging sub-circuit 200 and a switch sub-circuit 300; the switch sub-circuit 300 includes a second electronic switch 310 and a resistor R5, where a control end of the second electronic switch 310 is connected to a first end of the resistor R5, a second end of the resistor R5 is connected to the power input terminal IN through a resistor R4, a second end of the resistor R5 is further connected to an anode of a diode D1, a cathode of the diode D1 is connected to the power output terminal OUT, a first end of the second electronic switch 310 is connected to a control end of the first electronic switch 100, and a second end of the second electronic switch 310 is grounded; the first end of the charging sub-circuit 200 is connected to the power input terminal IN through a resistor R1, the first end of the charging sub-circuit 200 is further connected to the control terminal of the first electronic switch 100, and the second end of the charging sub-circuit 200 is grounded; a first terminal of the first electronic switch 100 is configured to be connected to the power input terminal IN, and a second terminal of the first electronic switch 100 is configured to be connected to the power output terminal OUT.
The short-circuit protection circuit is provided with the first electronic switch 100 between the power input end IN and the power output end OUT, and the charging sub-circuit 200 and the switching sub-circuit 300 are respectively arranged to be connected with the control end of the first electronic switch 100, and the first end of the charging sub-circuit 200 is connected with the power input end IN through a resistor R1, and the switching sub-circuit 300 is connected with the power input end IN through a resistor R4; IN this way, after power-up, since the power input terminal IN does not charge the charging sub-circuit 200, the control terminal of the first electronic switch 100 is at a low level to turn on the first electronic switch 100, so that the power input terminal IN is turned on with the power output terminal OUT, and the power output terminal OUT outputs power; then, if the power output terminal OUT is capable of normally supplying power to the device, on the one hand, the power input terminal IN outputs a current to the switching sub-circuit 300, so that the voltage of the control terminal of the second electronic switch 310 is greater than the on voltage of the second electronic switch 310 to turn on the second electronic switch 310, thereby enabling the control terminal of the first electronic switch 100 to continue to be low level to turn on the first electronic switch 100, so that the power input terminal IN and the power output terminal OUT are turned on, and on the other hand, if the device terminal to which the power output terminal OUT is connected is shorted, the voltage of the power output terminal OUT is lowered, after the voltage of the power output terminal OUT is lowered to a certain extent, the voltage of the control terminal of the second electronic switch 310 is smaller than the on voltage of the second electronic switch 310 to turn off the second electronic switch 310, at this time, the power input terminal IN charges the charging sub-circuit 200 through the resistor R1, the charging sub-circuit 200 is fully charged IN a short time and enables the control terminal of the first electronic switch 100 to be high level to turn off, so that the power input terminal IN and the power output terminal OUT is turned off, and the power output terminal OUT is stopped. When the circuit connected with the power output end OUT is IN short circuit, the power input end IN and the power output end OUT can be disconnected, the power is turned off, and the problem that products are damaged easily when the circuit connected with the power output end OUT is IN short circuit is avoided.
In one embodiment, the short-circuit protection circuit is a non-standard POE powered short-circuit protection circuit. The non-standard POE power supply short-circuit protection circuit can be applied to a non-standard POE power supply. In one embodiment, the power input is a POE power input, and the power output is a POE power output.
In order to further explain the short-circuit protection circuit of the present invention, the short-circuit protection circuit of the present invention is described below with reference to a circuit diagram of one embodiment. Fig. 2 is a circuit diagram of a short-circuit protection circuit according to an embodiment of the present invention.
In one embodiment, the charging sub-circuit 200 includes a capacitor C1 and a resistor R3 in series. Because of the charge and discharge function of the capacitor C1, the power input terminal IN can charge the capacitor C1, calculate the value, fully charge the capacitor C1 IN a short time, and discharge the capacitor C1 to the first electronic switch 100, i.e. the MOS transistor Q1, so as to change the conduction state of the MOS transistor Q1.
In order to protect the first electronic switch, in one embodiment, the control terminal of the first electronic switch 100 is connected to the first terminal of the charging sub-circuit 200 and the first terminal of the second electronic switch 310 through a resistor R2, respectively. In this way, the first electronic switching tube 100 is protected by the voltage division action of the resistor R2, and the first electronic switching tube 100 is prevented from being broken down.
In one embodiment, the first electronic switch is a MOS transistor. The MOS tube is a voltage control device, and the voltage of the MOS tube can be controlled by the charging sub-circuit 200 and the switching sub-circuit 300 to respectively control the on-off state of the MOS tube, so that the on-off state of the power input end IN and the power output end OUT can be controlled. And the MOS tube belongs to a voltage control device, and the voltage division effect of the resistor R2 does not influence the switching state of the MOS tube.
Further, the first electronic switch 100 is a PMOS transistor Q1, a gate of the PMOS transistor Q1 is connected to the first end of the charging sub-circuit 100 and the first end of the second electronic switch 310, a source of the PMOS transistor Q1 is connected to the power input terminal IN, and a drain of the PMOS transistor Q1 is connected to the power output terminal OUT. The grid electrode of the PMOS tube Q1 is turned on when the grid electrode of the PMOS tube Q1 is at a low level and turned off when the grid electrode of the PMOS tube Q1 is at a high level, and the grid electrode of the PMOS tube Q1 is pulled to be at a high level through the charging sub-circuit 200, so that the PMOS tube Q1 is turned off, the power input end IN and the power output end OUT are disconnected, the power input end IN is prevented from continuously supplying power to a product, and the product is protected.
In order to protect the second electronic switch, in one embodiment, the control terminal of the second electronic switch is also used to be grounded through a resistor R6. In this way, the second electronic switching tube 310 is protected by the voltage division action of the resistor R6, and the second electronic switching tube 310 is prevented from being broken down.
In one embodiment, the second electronic switch 310 is a triode. The triode is a current control device, and the base voltage of the triode can be controlled respectively by providing high voltage through the power input end IN when the equipment end is normal and providing low voltage when the equipment end is short-circuited, so that the current flowing through the base is changed to control the on-off state and the off state, and the on-off state between the first electronic switch 100 and the grounding end is controlled to control whether the control end of the first electronic switch 100 is grounded or not.
Further, the second electronic switch 310 is an NPN triode Q2, a base electrode of the NPN triode Q2 is connected to the first end of the resistor R5, a collector electrode of the NPN triode Q2 is connected to the control end of the first electronic switch 100, and an emitter electrode of the NPN triode Q2 is grounded. The triode Q2 is conducted when the base voltage of the triode Q2 is larger than the conducting voltage and is turned off when the base voltage of the triode Q2 is smaller than the conducting voltage when the power output end OUT is short-circuited, so that the triode Q2 is turned off, the first electronic switch 100 is disconnected from the grounding end, the grounding end is prevented from pulling down the voltage of the control end of the first electronic switch 100, and the fact that the first electronic switch 100 is conducted to continue to supply power to a product to cause product damage is avoided.
In order to provide a stable dc power supply to the power supply output, in one embodiment, the negative electrode of the diode D1 is used to connect to the power supply output through an inductor. And a stable direct current power supply is provided for the power supply output end through the effect of the inductor.
IN one embodiment, the gate of the PMOS transistor Q1 is connected to the first ends of the serially connected capacitor C1 and resistor R3 and the collector of the NPN transistor Q2 through a resistor R2, the source of the PMOS transistor is connected to the power input terminal IN, the drain of the PMOS transistor is connected to the power output terminal PUT, the second ends of the serially connected capacitor C1 and resistor R3 are connected to ground, the emitter of the NPN transistor Q2 is connected to ground, the base of the NPN transistor Q2 is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the power input terminal IN through a resistor R4, the second end of the resistor R5 is further connected to the power output terminal OUT through a diode D1, and the power input terminal IN is further connected to the gate of the PMOS transistor Q1 through a resistor R1.
The invention also provides a non-standard POE power supply, which comprises the short-circuit protection circuit in any embodiment.
Above-mentioned nonstandard POE power supply ware, when the circuit of the product of nonstandard POE power supply ware connection appears the short circuit phenomenon promptly, can break off between power input end and the power output end, turn off the power, when having avoided the circuit of the product of nonstandard POE power supply ware connection to appear the short circuit phenomenon, lead to the problem of product damage easily.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A short-circuit protection circuit, comprising: the electronic device comprises a first electronic switch and a switch control circuit, wherein the switch control circuit comprises a charging sub-circuit and a switch sub-circuit; the switch sub-circuit comprises a second electronic switch and a resistor R5, wherein the control end of the second electronic switch is connected with the first end of the resistor R5, the second end of the resistor R5 is used for being connected with the power input end through a resistor R4, the second end of the resistor R5 is also connected with the positive electrode of a diode D1, the negative electrode of the diode D1 is used for being connected with the power output end, the first end of the second electronic switch is connected with the control end of the first electronic switch, and the second end of the second electronic switch is used for being grounded;
the first end of the charging sub-circuit is connected with the power input end through a resistor R1, the first end of the charging sub-circuit is also connected with the control end of the first electronic switch, and the second end of the charging sub-circuit is grounded;
the first end of the first electronic switch is used for being connected with the power input end, and the second end of the first electronic switch is used for being connected with the power output end;
the power supply input end is a POE power supply input end, and the power supply output end is a POE power supply output end.
2. The short-circuit protection circuit of claim 1, wherein the charging sub-circuit comprises a capacitor C1 and a resistor R3 in series.
3. The short-circuit protection circuit according to claim 1, wherein the control terminal of the first electronic switch is connected to the first terminal of the charging sub-circuit and the first terminal of the second electronic switch, respectively, through a resistor R2.
4. The short-circuit protection circuit of claim 1, wherein the control terminal of the second electronic switch is further configured to be grounded via a resistor R6.
5. The short-circuit protection circuit of claim 1, wherein the first electronic switch is a MOS transistor.
6. The short-circuit protection circuit according to claim 5, wherein the first electronic switch is a PMOS transistor, a gate of the PMOS transistor is connected to the first end of the charging sub-circuit and the first end of the second electronic switch, respectively, a source of the PMOS transistor is connected to the power input terminal, and a drain of the PMOS transistor is connected to the power output terminal.
7. The short-circuit protection circuit of claim 1, wherein the second electronic switch is a triode.
8. The short-circuit protection circuit according to claim 7, wherein the second electronic switch is an NPN triode, a base electrode of the NPN triode is connected to the first end of the resistor R5, a collector electrode of the NPN triode is connected to the control end of the first electronic switch, and an emitter electrode of the NPN triode is connected to ground.
9. The short-circuit protection circuit according to claim 1, wherein the cathode of the diode D1 is adapted to be connected to the power supply output terminal through an inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811085792.1A CN109088391B (en) | 2018-09-18 | 2018-09-18 | Short-circuit protection circuit and nonstandard POE power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811085792.1A CN109088391B (en) | 2018-09-18 | 2018-09-18 | Short-circuit protection circuit and nonstandard POE power supply |
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| Publication Number | Publication Date |
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| CN109088391A CN109088391A (en) | 2018-12-25 |
| CN109088391B true CN109088391B (en) | 2023-10-17 |
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| CN201811085792.1A Active CN109088391B (en) | 2018-09-18 | 2018-09-18 | Short-circuit protection circuit and nonstandard POE power supply |
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| US20150365003A1 (en) * | 2014-06-12 | 2015-12-17 | Laurence P. Sadwick | Power Conversion System |
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| WO2008001644A1 (en) * | 2006-06-27 | 2008-01-03 | Panasonic Electric Works Co., Ltd. | Polarity switching circuit and feeding unit |
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| CN109088391A (en) | 2018-12-25 |
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