CN217469745U - Power switch tube short-circuit protection device and switch power supply thereof - Google Patents
Power switch tube short-circuit protection device and switch power supply thereof Download PDFInfo
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- CN217469745U CN217469745U CN202221457798.9U CN202221457798U CN217469745U CN 217469745 U CN217469745 U CN 217469745U CN 202221457798 U CN202221457798 U CN 202221457798U CN 217469745 U CN217469745 U CN 217469745U
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Abstract
The utility model discloses a power switch tube short-circuit protection device and switching power supply thereof, include: a driver chip; the output end of the driving chip is respectively and electrically connected with the first power switch tube and the second power switch tube; the input end of the driving chip comprises a control signal input end of a first power switch tube and a control signal input end of a second power switch tube; a logic judgment device; the input end of the logic judgment device comprises a control signal input end of a first power switch tube and a control signal input end of a second power switch tube; the output end of the logic judgment device is electrically connected with the enabling end of the driving chip, and the logic judgment device outputs a low level when the control signal of the first power switch tube and the control signal of the second power switch tube are both high levels. The scheme can solve the problem that instantaneous current flowing through the power switch tube is too large to damage the power switch tube due to the fact that the power switch tube which is alternatively conducted is short-circuited because of simultaneous conduction without adding an extra current sampling and protection circuit.
Description
Technical Field
The utility model relates to a switching power supply field, especially a power switch tube short-circuit protection device and switching power supply thereof.
Background
At present, in the field of switching power supplies, alternating-conducting power switching tubes are often used for AC/DC voltage conversion, and when the driving signals of the alternating-conducting power switching tubes are high level at the same time, the short circuit of the power switching tubes can cause the increase of instantaneous current flowing through the power switching tubes to damage the power switching tubes. In order to avoid the damage of the power switch tubes caused by the simultaneous conduction, a current protection circuit is generally used for sampling the current flowing through the power switch tubes, and when the current is judged to be overlarge, the driving signal is immediately turned off to achieve the purpose of turning off the power switch tubes.
However, the above-mentioned prior art has the following disadvantages:
in the prior art, a current sampling device needs to be added, and a current protection circuit needs to be designed, so that time and labor are wasted. The current protection circuit usually cannot process the current in real time, and needs to process the current after converting the current into a voltage signal, so that the risk of short-circuit overcurrent protection is not timely exists.
Therefore, the utility model is especially provided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power switch tube short-circuit protection device and switching power supply thereof need not increase extra electric current sampling and protection circuit and also can solve the power switch tube that switches on in turn because switch on and the short circuit simultaneously, causes to flow power switch tube instantaneous current too big, damages power switch tube's problem.
In order to solve the above problem, an embodiment of the utility model provides a power switch tube short-circuit protection device, include:
a driving chip; the output end of the driving chip is respectively and electrically connected with the first power switch tube and the second power switch tube; the input end of the driving chip comprises a control signal input end of a first power switch tube and a control signal input end of a second power switch tube;
a logic judgment device; the input end of the logic judgment device comprises a control signal input end of a first power switch tube and a control signal input end of a second power switch tube; the output end of the logic judgment device is electrically connected with the enabling end of the driving chip, and the logic judgment device is used for outputting a low level when the control signal of the first power switch tube and the control signal of the second power switch tube are both high levels.
Further, the logic judgment device is a NAND gate.
Further, the model of the driving chip is MCP14E 4.
The utility model also provides a switching power supply, including foretell power switch tube short-circuit protection device.
Compared with the prior art, the utility model discloses a following beneficial effect has: the control signal of the power switch tube becomes the enabling signal of the driving chip after passing through the NAND gate, when the control signal A and the control signal B of the power switch tube which are alternately conducted are high level at the same time, the two groups of control signals are low level after passing through the NAND gate, and the driving chip does not output at the moment, so that the direct short circuit of the power switch tube which is alternately conducted due to the fact that the driving signal is high level at the same time is effectively avoided. The device is simple and effective, has quick response, and does not need to design an additional sampling circuit to sample the current of the power switch tube in real time.
Drawings
Fig. 1 is a schematic structural diagram of a power switching tube short-circuit protection device according to an embodiment of the present invention;
in the figure: 1-a driving chip; 11-a control signal input end of a first power switch tube on a driving chip; 12-a control signal input end of a second power switch tube on the driving chip; 13-enable terminal; 2-a first power switch tube; 3-a second power switch tube; a 4-NAND gate; 41-a control signal input end of a first power switch tube of a NAND gate; and the control signal input end of a second power switch tube of the 42-NAND gate.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments shown in the drawings. It should be understood that these embodiments are described only to enable those skilled in the art to better understand the implementation of the present invention, and are not intended to limit the scope of the present invention in any way.
Referring to fig. 1, an embodiment of the present invention provides a power switch short-circuit protection device, including a driver chip 1, in this embodiment, a model sampled by the driver chip 1 is MCP14E4, and an input end of the MCP includes a control signal input end 11 of a first power switch on the driver chip and a control signal input end 12 of a second power switch on the driver chip, which are respectively used for receiving a first power switch control signal and a second power switch control signal (i.e., control signal a and control signal B) from a control circuit. The two signal output ends are respectively and electrically connected with the first power switch tube 2 and the second power switch tube 3, and are used for outputting a driving signal (namely, a driving signal A or a driving signal B) to the first power switch tube 2 and the second power switch tube 3 after receiving the control signal. As described above, when the driving signals of the first power switch 2 and the second power switch 3 which are alternately turned on are simultaneously high, the power switches are short-circuited, and thus the instantaneous current flowing through the power switches is increased to damage the power switches.
To solve this problem, according to an embodiment of the present invention, a nand gate 4 is electrically connected to the enable terminal 13 of the driver chip 1. The output end of the nand gate 4 is directly electrically connected to the enable end 13 of the driver chip 1. Two input ends of the nand gate 4 are respectively a control signal input end 41 of a first power switch tube of the nand gate and a control signal input end 42 of a second power switch tube of the nand gate. When the input of the enable end 13 of the driving chip 1 is high level, the driving chip 1 works, and when the input is low level, the driving chip 1 does not work, and the driving chip 1 has no output. And the nand gate 4 can output two high level signals as low level, so when the control signal of the first power switch tube 2 and the control signal of the second power switch 3 are both high level, the two high level signals are converted into low level signals through the nand gate 4 and output to the enable end 13 of the driving chip 1, even if the enable signal is low level, the driving chip 1 is further prevented from working, and the power switch tubes which are alternately conducted are effectively prevented from being directly connected and short-circuited due to the fact that the driving signals are high level signals at the same time. When at least one of the control signal a and the control signal B is at a low level, the nand gate 4 still outputs a high level, and the driver chip 1 normally operates to output a corresponding driving signal.
The embodiment of the utility model provides a still provide the switching power supply who contains above-mentioned power switch tube short-circuit protection device, can also include control circuit in the switching tube power supply for with driver chip 1 and NAND gate 4 electric connection, transmit the control signal of first power switch tube 2 and second power switch tube 3.
The present invention has been described in detail with reference to specific embodiments, and the description of the embodiments is only for the purpose of helping understanding the core idea of the present invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are all included in the scope of the present invention.
Claims (4)
1. Power switch tube short-circuit protection device, its characterized in that includes:
a driving chip; the output end of the driving chip is respectively and electrically connected with the first power switch tube and the second power switch tube; the input end of the driving chip comprises a control signal input end of a first power switch tube and a control signal input end of a second power switch tube;
a logic judgment device; the input end of the logic judgment device comprises a control signal input end of a first power switch tube and a control signal input end of a second power switch tube; the output end of the logic judgment device is electrically connected with the enabling end of the driving chip, and the logic judgment device is used for outputting a low level when the control signal of the first power switch tube and the control signal of the second power switch tube are both high levels.
2. The power switching tube short-circuit protection device according to claim 1, wherein the logic determination device is a nand gate.
3. The power switching tube short-circuit protection device of claim 1, wherein the model of the driving chip is MCP14E 4.
4. A switching power supply comprising a power switching tube short circuit protection device as claimed in any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221457798.9U CN217469745U (en) | 2022-06-10 | 2022-06-10 | Power switch tube short-circuit protection device and switch power supply thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221457798.9U CN217469745U (en) | 2022-06-10 | 2022-06-10 | Power switch tube short-circuit protection device and switch power supply thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217469745U true CN217469745U (en) | 2022-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221457798.9U Active CN217469745U (en) | 2022-06-10 | 2022-06-10 | Power switch tube short-circuit protection device and switch power supply thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217469745U (en) |
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2022
- 2022-06-10 CN CN202221457798.9U patent/CN217469745U/en active Active
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