CN217741300U - Short-circuit protection circuit and system - Google Patents
Short-circuit protection circuit and system Download PDFInfo
- Publication number
- CN217741300U CN217741300U CN202221155528.2U CN202221155528U CN217741300U CN 217741300 U CN217741300 U CN 217741300U CN 202221155528 U CN202221155528 U CN 202221155528U CN 217741300 U CN217741300 U CN 217741300U
- Authority
- CN
- China
- Prior art keywords
- circuit
- short
- resistor
- control
- grounded
- 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
Images
Landscapes
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a power electronic technology field mainly provides a short-circuit protection circuit and system, short-circuit protection circuit includes short-circuit monitoring circuit, seals ripples circuit and timing circuit, the control end of short-circuit control is connected with power and DC device's first end respectively, the first end of short-circuit monitoring circuit is connected with timing circuit's control end and power respectively, short-circuit monitoring circuit's second end ground connection, timing circuit's first end is connected with power and the control end of sealing ripples circuit respectively, timing circuit's second end ground connection, the first end of sealing ripples circuit is connected with DC device's second end, the second end ground connection of sealing ripples circuit. The short-circuit protection circuit carries out real time monitoring to DC device through short-circuit monitoring circuit, realizes when the fan short circuit, and the quick hiccup protection is carried out to DC device through sealing the ripples circuit to hiccup the controllable of frequency in realizing the circuit through setting up timing circuit, thereby improve the reliability of circuit.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a power electronic technology field especially relates to a short-circuit protection circuit and system.
[ background of the invention ]
In a power supply system, for a short-circuit fault occurring in the operation of a dc device, in the prior art, a PTC (Positive Temperature Coefficient thermistor) is usually connected in series with the dc device, and a short-circuit protection effect is achieved by using the increase of the resistance of the PTC with the increase of Temperature, or a fuse link fuse is added in a circuit.
[ Utility model ] content
The utility model discloses embodiment mainly provides a short-circuit protection circuit and system, aims at solving among the prior art fan short-circuit protection response speed slow, the technical problem that the reliability is low.
In order to solve the above technical problem, the utility model discloses a technical scheme that embodiment adopted is: there is provided a short-circuit protection circuit applied to a direct current device, the short-circuit protection circuit including: the short circuit monitoring circuit, the wave sealing circuit and the timing circuit;
the control end of the short-circuit monitoring circuit is respectively connected with a power supply and the first end of the direct-current device, the first end of the short-circuit monitoring circuit is respectively connected with the control end of the timing circuit and the power supply, the first end of the timing circuit is respectively connected with the power supply and the control end of the wave-sealing circuit, the first end of the wave-sealing circuit is connected with the second end of the direct-current device, and the second end of the wave-sealing circuit is grounded;
when the direct current device is in short circuit, the short circuit monitoring circuit is cut off because the voltage of the control end is lower than the preset voltage, the timing circuit is in a conducting state, and the control end of the wave sealing circuit is grounded, so that the direct current device stops working because of the circuit breaking.
Optionally, the short circuit monitoring circuit includes a control module and a first energy storage module;
the first end of the control module is connected with the power supply and the control end of the timing circuit respectively, the control end of the control module is connected with the second end of the first energy storage module, the second end of the control module is grounded, the first end of the first energy storage module is connected with the power supply and the first end of the direct current device respectively, and the third end of the first energy storage module is grounded.
Optionally, the first energy storage module includes a resistor R1, a resistor R3, a resistor R5, a capacitor C2, and a diode D1;
the first end of resistance R1 with the power is connected, resistance R1's second end respectively with resistance R5's first end the first end of DC device is connected, resistance R5's second end respectively with electric capacity C2's first end with control module's control end is connected, electric capacity C2's second end ground connection, electric capacity C2's first end still with diode D1's positive pole is connected, diode D1's negative pole with resistance R3's first end is connected, resistance R3's second end with DC device's first end is connected.
Optionally, the control module includes a voltage regulator TL431, a resistor R2, a resistor R4, and a capacitor C1;
the control end of the voltage-stabilizing source TL431 is connected with the first end of the capacitor C2, the first end of the voltage-stabilizing source TL431 is connected with the second end of the resistor R2, the first end of the resistor R2 is connected with the power supply, the second end of the voltage-stabilizing source TL431 is grounded, the second end of the resistor R2 is further connected with the first end of the resistor R4, the second end of the resistor R4 is respectively connected with the first end of the capacitor C1 and the control end of the timing circuit, and the second end of the capacitor C1 is grounded.
Optionally, the timing circuit includes a power tube Q1, a second energy storage module, a first discharging module, and a second discharging module;
the first end of the power tube Q1 is connected with the power supply, the control end of the power tube Q1 is connected with the first end of the short-circuit monitoring circuit, the second end of the power tube Q1 is respectively connected with the first end of the second energy storage module and the control end of the first discharging module, the second end of the energy storage circuit is connected with the second discharging module, the third end of the second energy storage module is grounded, the first end of the first discharging module is respectively connected with the power supply and the control end of the wave sealing circuit, the second end of the first discharging module is grounded, the first end of the second discharging module is connected with the control end of the short-circuit monitoring circuit, and the second end of the second discharging module is grounded.
Optionally, the second energy storage module includes a capacitor C3 and a resistor R12;
the first end of the capacitor C3 is connected with the second end of the power tube Q1 and the control end of the first discharging module respectively, the second end of the capacitor C3 is connected with the control end of the second discharging module and the first end of the resistor R12 respectively, and the second end of the resistor R12 is grounded.
Optionally, the first discharging module includes a resistor R10, a resistor R13, and a power tube Q4, a first end of the resistor R10 is connected to a first end of the capacitor C3, a second end of the resistor R10 is respectively connected to a control end of the power tube Q4 and the first end of the resistor R13, a second end of the resistor R13 is grounded, a first end of the power tube Q4 is connected to the control end of the wave-sealing circuit, and a second end of the power tube Q4 is grounded; and/or
The second module of discharging includes resistance R6, resistance R7, resistance R8 and power tube Q2, resistance R7's first end with R12's first end is connected, resistance R7's second end respectively with resistance R8's first end with power tube Q2's control end is connected, resistance R8's second end ground connection, power tube Q2's first end is passed through resistance R6 with the first end of first energy storage module is connected, power tube Q2's second end ground connection.
Optionally, the wave blocking circuit includes a resistor R9, a resistor R11, and a power tube Q3;
the first end of the resistor R9 is connected with the power supply, the second end of the resistor R9 is respectively connected with the first end of the power tube Q4 and the control end of the power tube Q3, the control end of the power tube Q3 is also connected with the first end of the resistor R11, the second end of the resistor R11 is grounded, the first end of the power tube Q3 is connected with the second end of the direct-current device, and the second end of the power tube Q3 is grounded.
Optionally, the short-circuit protection circuit further includes a diode D2, a cathode of the diode D2 is connected to the first end of the resistor R12, and an anode of the diode D2 is grounded.
In order to solve the above technical problem, the embodiment of the present invention adopts another technical solution: a short-circuit protection system, the short-circuit protection system comprising:
a direct current device;
a power source; and
the short-circuit protection circuit as described above.
Optionally, the direct current device is a direct current fan.
Be different from the condition of correlation technique, the embodiment of the utility model provides a short-circuit protection circuit and system, short-circuit protection circuit includes short-circuit monitoring circuit, seals ripples circuit and timing circuit, the control end of short-circuit monitoring is connected with power and DC device's first end respectively, short-circuit monitoring circuit's first end respectively with timing circuit's control end and power are connected, timing circuit's first end respectively with the power with the control end of sealing ripples circuit is connected, seal ripples circuit's first end with DC device's second end is connected, seal ripples circuit's second end ground connection. The short-circuit protection circuit passes through short-circuit monitoring circuit carries out real time monitoring, and when the fan short circuit, it is right to seal the ripples circuit through can be quick the fan carries out hiccup protection to realize hiccup frequency's in the circuit controllable through setting up timing circuit, thereby improve the reliability of circuit.
[ description of the drawings ]
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic structural diagram of a short-circuit protection system according to an embodiment of the present invention;
fig. 2 is a block diagram of a short-circuit protection circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of a short circuit monitoring circuit according to an embodiment of the present invention;
fig. 4 is a block diagram of a timing circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a short-circuit protection circuit according to an embodiment of the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a short-circuit protection system according to an embodiment of the present invention. As shown in fig. 1, the short-circuit protection system 1 includes a short-circuit protection circuit 100, a power supply 200, and a direct-current device 300. A first terminal of the dc device 300 is connected to the power supply 200 through the short-circuit protection circuit 100, and a second terminal of the dc device 300 is grounded.
The power supply 200 is used for supplying power to the short-circuit protection circuit 100 and the dc device 300, wherein the voltage supplied by the power supply 200 may be 5-36V.
The short-circuit protection circuit 100 is configured to disconnect the dc device 300 from the power supply 200 in time when the dc device 300 is short-circuited, so as to protect the dc device 300. The dc device 300 may be a dc fan, a dc motor, or other low-power dc devices, which is not limited herein.
Referring to fig. 2, fig. 2 is a block diagram of a short-circuit protection circuit according to an embodiment of the present invention, and as shown in fig. 2, the short-circuit protection circuit 100 includes a short-circuit monitoring circuit 10, a timing circuit 20, and a wave-sealing circuit 30;
the control terminal of the short circuit monitoring circuit 10 is connected to the power supply 200 and the first terminal of the dc device 300, the first terminal of the short circuit monitoring circuit 10 is connected to the control terminal of the timing circuit 20 and the power supply 200, the third terminal of the short circuit monitoring circuit 10 is grounded, the first terminal of the timing circuit 20 is connected to the control terminals of the power supply 200 and the wave sealing circuit 30, the third terminal of the timing circuit 20 is grounded, the first terminal of the wave sealing circuit 30 is connected to the second terminal of the dc device 300, and the second terminal of the wave sealing circuit 30 is grounded.
When the dc device 300 is normal, the current of the power supply 200 flows into the control terminal of the short circuit monitoring circuit 10 and the dc device 300 respectively, when the voltage of the control terminal of the short circuit monitoring circuit 10 is greater than a preset voltage, the short circuit monitoring circuit 10 is in an on state, the current flows into the ground terminal through the short circuit monitoring circuit 10, the control terminal of the timing circuit 20 is grounded through the short circuit monitoring circuit 10, the timing circuit 20 is turned off, when the timing circuit 20 is turned off, the blocking circuit 30 is in an on state, at this time, the current in the dc device 300 flows into the ground terminal through the blocking circuit 30, and the dc device 300 operates normally. Wherein the preset voltage may be 2.5V.
When the dc device 300 is short-circuited and the voltage of the control terminal of the short-circuit monitoring circuit 10 is smaller than the preset voltage, the short-circuit monitoring circuit 10 is in an off state, the current in the power supply 200 directly flows into the control terminal of the timing circuit 20, the timing circuit 20 is turned on, when the timing circuit 20 is turned on, the control terminal of the wave-sealing circuit 30 is grounded, the wave-sealing circuit 30 is in an off state, and at this time, the dc device 300 is turned off due to the open circuit. In this way, the short-circuit monitoring circuit 10 monitors the dc device 300 in real time, and once the dc device 300 is in a short-circuit state, the wave-sealing circuit 30 is directly turned off, so that the dc device 300 is in an open circuit, thereby protecting the dc device 300.
As shown in fig. 3, the short circuit monitoring circuit 10 includes a control module 101 and a first energy storage module 102, a first end of the control module 101 is connected to the power supply 200 and a control end of the timing circuit 20, a control end of the control module 101 is connected to a second end of the first energy storage module 102, the second end of the control module 101 is grounded, a first end of the first energy storage module 102 is connected to the power supply 200 and a first end of the dc device 300, and a third end of the first energy storage module 102 is grounded. When the dc device 300 is normal, the current of the power supply 200 is received through the second end of the first energy storage module 102, so that the voltage of the control end of the control module 101 is greater than a preset voltage, the timing circuit 20 is controlled to be turned off, the wave-sealing circuit 30 is turned on, and the dc device 300 works normally; when the dc device 300 is short-circuited, the first energy storage module 102 starts to discharge the dc device 300, so that the voltage of the control terminal of the control module 101 is smaller than a preset voltage, the timing circuit 20 is turned on, the wave-sealing circuit 30 is turned off, and the dc device 300 is open-circuited.
Specifically, as shown in fig. 5, the first energy storage module 102 includes a resistor R1, a resistor R3, a resistor R5, a capacitor C2, and a diode D1; the control module 101 includes a voltage regulator TL431, a resistor R2, a resistor R4, and a capacitor C1.
The first end of the resistor R1 is connected to the power supply 200, the second end of the resistor R1 is connected to the first end of the resistor R5 and the first end of the dc device 300, the second end of the resistor R5 is connected to the first end of the capacitor C2 and the control end of the control module 101, the second end of the capacitor C2 is grounded, the first end of the capacitor C2 is further connected to the anode of the diode D1, the cathode of the diode D1 is connected to the first end of the resistor R3, and the second end of the resistor R3 is connected to the first end of the dc device 300. Thus, by controlling the resistance of the resistor R5, the charging time of the capacitor C2 can be controlled.
The control end of the voltage-stabilizing source TL431 is connected to the first end of the capacitor C2, the first end of the voltage-stabilizing source TL431 is connected to the second end of the resistor R2, the first end of the resistor R2 is connected to the power supply, the second end of the voltage-stabilizing source TL431 is grounded, the second end of the resistor R2 is further connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the first end of the capacitor C1 and the control end of the timing circuit 20, and the second end of the capacitor C1 is grounded. Therefore, the on-off of the timing circuit 20 can be controlled by controlling the voltage of the control end of the voltage-stabilizing source TL 431.
As shown in fig. 4, the timing circuit 20 includes a power transistor Q1, a second energy storage module 201, a first discharging module 202, and a second discharging module 203; the first end of the power tube Q1 is connected to the power supply 200, the control end of the power tube Q1 is connected to the first end of the short-circuit monitoring circuit 10, the second end of the power tube Q1 is connected to the first end of the second energy storage module 201 and the control end of the first discharge module 202, the second end of the second energy storage module 201 is connected to the control end of the second discharge module 203, the third end of the second energy storage module 201 is grounded, the first end of the first discharge module 202 is connected to the power supply 200 and the control end of the wave-sealing circuit 30, the second end of the first discharge module 202 is grounded, the first end of the second discharge module 203 is connected to the control end of the short-circuit monitoring circuit 10, and the second end of the second discharge module 203 is grounded.
At the moment when the power tube Q1 is turned on, the first discharging module 202 is also turned on, the second energy storage module 201 discharges through the first discharging module 202, when the power tube Q1 is continuously turned on, the second energy storage module 201 starts to be charged, when the voltage of the second energy storage module 201 slowly rises, the second discharging module starts to be turned on, and at this moment, the first energy storage module 101 discharges through the second discharging module 203, so that the first energy storage module is charged from zero next time. In this way, the hiccup frequency of the short-circuit protection circuit 100 can be set by the timing circuit 20, thereby improving the reliability of the circuit.
Specifically, as shown in fig. 5, the second energy storage module includes a capacitor C3 and a resistor R12; the first discharging module comprises a resistor R10, a resistor R13 and a power tube Q4; the second discharging module comprises a resistor R6, a resistor R7, a resistor R8 and a power tube Q2.
A first end of the capacitor C3 is connected to the second end of the power transistor Q1 and the control end of the first discharging module 202, a second end of the capacitor C3 is connected to the control end of the second discharging module 203 and the first end of the resistor R12, and a second end of the resistor R12 is grounded. When the power tube Q1 is turned on, the power supply 200 starts to charge the capacitor C3, so that the first discharging module 202 is turned on rapidly, the voltage of the resistor R12 decreases slowly while the voltage of the capacitor C3 increases, and when the voltage of the resistor R12 reaches the voltage threshold, the second discharging module 203 is turned on.
The first end of the resistor R10 is connected to the first end of the capacitor C3, the second end of the resistor R10 is connected to the control end of the power transistor Q4 and the first end of the resistor R13, the second end of the resistor R13 is grounded, the first end of the power transistor Q4 is connected to the control end of the wave-sealing circuit 30, and the second end of the power transistor Q4 is grounded.
The first end of the resistor R7 is connected to the first end of the resistor R12, the second end of the resistor R7 is connected to the first end of the resistor R8 and the control end of the power transistor Q2, the second end of the resistor R8 is grounded, the first end of the power transistor Q2 is connected to the first end of the first energy storage module 102 through the resistor R6, and the second end of the power transistor Q2 is grounded.
Referring to fig. 5, the wave-sealing circuit includes a resistor R9, a resistor R11, and a power transistor Q3; the first end of the resistor R9 is connected with the power supply 200, the second end of the resistor R9 is respectively connected with the first end of the power tube Q4 and the control end of the power tube Q3, the control end of the power tube Q3 is also connected with the first end of the resistor R11, the second end of the resistor R11 is grounded, the first end of the power tube Q3 is connected with the second end of the direct-current device 300, and the second end of the power tube Q3 is grounded.
In some embodiments, as shown in fig. 5, the short-circuit protection circuit 100 further includes a diode D2, a cathode of the diode D2 is connected to the first end of the resistor R12, and an anode of the diode D2 is grounded. Therefore, when the power tube Q1 is cut off, the voltage of the first end of the resistor R12 is ensured to be 0V.
The utility model provides a short-circuit protection circuit, including short-circuit monitoring circuit, a ripples circuit and timing circuit, the control end of short-circuit control is connected with power and DC device's first end respectively, the first end of short-circuit monitoring circuit is connected with timing circuit's control end and power respectively, short-circuit monitoring circuit's second end ground connection, timing circuit's first end is connected with power and a ripples circuit's control end respectively, timing circuit's second end ground connection, a ripples circuit's first end and DC device's second end are connected, a ripples circuit's second end ground connection. The short-circuit protection circuit carries out real time monitoring to DC device through short-circuit monitoring circuit, realizes when the fan short circuit, and the quick burp protection is carried out to DC device through sealing the ripples circuit to through setting up the controllable of burp frequency in the timing circuit realization circuit, thereby improve the reliability of circuit.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A short-circuit protection circuit for a direct current device, the short-circuit protection circuit comprising: the short circuit monitoring circuit, the wave sealing circuit and the timing circuit;
the control end of the short-circuit monitoring circuit is respectively connected with a power supply and the first end of the direct-current device, the first end of the short-circuit monitoring circuit is respectively connected with the control end of the timing circuit and the power supply, the first end of the timing circuit is respectively connected with the power supply and the control end of the wave sealing circuit, the first end of the wave sealing circuit is connected with the second end of the direct-current device, and the second end of the wave sealing circuit is grounded;
when the direct current device is in short circuit, the short circuit monitoring circuit is cut off because the voltage of the control end is lower than the preset voltage, the timing circuit is in a conducting state, and the control end of the wave sealing circuit is grounded, so that the direct current device stops working because of the cut-off.
2. The short-circuit protection circuit of claim 1, wherein the short-circuit monitoring circuit comprises a control module and a first energy storage module;
the first end of the control module is connected with the power supply and the control end of the timing circuit respectively, the control end of the control module is connected with the second end of the first energy storage module, the second end of the control module is grounded, the first end of the first energy storage module is connected with the power supply and the first end of the direct current device respectively, and the third end of the first energy storage module is grounded.
3. The short-circuit protection circuit of claim 2, wherein the first energy storage module comprises a resistor R1, a resistor R3, a resistor R5, a capacitor C2, and a diode D1;
resistance R1's first end with the power is connected, resistance R1's second end respectively with resistance R5's first end the first end of direct current device is connected, resistance R5's second end respectively with electric capacity C2's first end with control module's control end is connected, electric capacity C2's second end ground connection, electric capacity C2's first end still with diode D1's positive pole is connected, diode D1's negative pole with resistance R3's first end is connected, resistance R3's second end with direct current device's first end is connected.
4. The short-circuit protection circuit of claim 3, wherein the control module comprises a voltage regulator TL431, a resistor R2, a resistor R4 and a capacitor C1;
the control end of the voltage-stabilizing source TL431 is connected with the first end of the capacitor C2, the first end of the voltage-stabilizing source TL431 is connected with the second end of the resistor R2, the first end of the resistor R2 is connected with the power supply, the second end of the voltage-stabilizing source TL431 is grounded, the second end of the resistor R2 is further connected with the first end of the resistor R4, the second end of the resistor R4 is respectively connected with the first end of the capacitor C1 and the control end of the timing circuit, and the second end of the capacitor C1 is grounded.
5. The short-circuit protection circuit of claim 1, wherein the timing circuit comprises a power transistor Q1, a second energy storage module, a first discharge module and a second discharge module;
the first end of the power tube Q1 is connected with the power supply, the control end of the power tube Q1 is connected with the first end of the short-circuit monitoring circuit, the second end of the power tube Q1 is respectively connected with the first end of the second energy storage module and the control end of the first discharging module, the second end of the second energy storage module is connected with the control end of the second discharging module, the third end of the second energy storage module is grounded, the first end of the first discharging module is respectively connected with the power supply and the control end of the wave sealing circuit, the second end of the first discharging module is grounded, the first end of the second discharging module is connected with the control end of the short-circuit monitoring circuit, and the second end of the second discharging module is grounded.
6. The short-circuit protection circuit of claim 5, wherein the second energy storage module comprises a capacitor C3 and a resistor R12;
the first end of the capacitor C3 is connected with the second end of the power tube Q1 and the control end of the first discharging module respectively, the second end of the capacitor C3 is connected with the control end of the second discharging module and the first end of the resistor R12 respectively, and the second end of the resistor R12 is grounded.
7. The short-circuit protection circuit according to claim 6, wherein the first discharging module includes a resistor R10, a resistor R13 and a power transistor Q4, a first end of the resistor R10 is connected to a first end of the capacitor C3, a second end of the resistor R10 is respectively connected to a control end of the power transistor Q4 and a first end of the resistor R13, a second end of the resistor R13 is grounded, a first end of the power transistor Q4 is connected to a control end of the wave-sealing circuit, and a second end of the power transistor Q4 is grounded; and/or
The second discharge module includes resistance R6, resistance R7, resistance R8 and power tube Q2, resistance R7's first end with R12's first end is connected, resistance R7's second end respectively with resistance R8's first end with power tube Q2's control end is connected, resistance R8's second end ground connection, power tube Q2's first end is passed through resistance R6 with short circuit monitoring circuit's control end is connected, power tube Q2's second end ground connection.
8. The short-circuit protection circuit of claim 7, wherein the wave-blocking circuit comprises a resistor R9, a resistor R11 and a power tube Q3;
the first end of the resistor R9 is connected with the power supply, the second end of the resistor R9 is respectively connected with the first end of the power tube Q4 and the control end of the power tube Q3, the control end of the power tube Q3 is also connected with the first end of the resistor R11, the second end of the resistor R11 is grounded, the first end of the power tube Q3 is connected with the second end of the direct-current device, and the second end of the power tube Q3 is grounded.
9. The short-circuit protection circuit of claim 6, further comprising a diode D2, wherein a cathode of the diode D2 is connected to the first end of the resistor R12, and an anode of the diode D2 is grounded.
10. A short-circuit protection system, characterized in that the short-circuit protection system comprises:
a direct current device;
a power source; and
the short-circuit protection circuit of any one of claims 1 to 9.
11. The short-circuit protection system of claim 10, wherein the dc device is a dc fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221155528.2U CN217741300U (en) | 2022-05-13 | 2022-05-13 | Short-circuit protection circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221155528.2U CN217741300U (en) | 2022-05-13 | 2022-05-13 | Short-circuit protection circuit and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217741300U true CN217741300U (en) | 2022-11-04 |
Family
ID=83837005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221155528.2U Active CN217741300U (en) | 2022-05-13 | 2022-05-13 | Short-circuit protection circuit and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217741300U (en) |
-
2022
- 2022-05-13 CN CN202221155528.2U patent/CN217741300U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105966199A (en) | New energy automobile PTC heating control system and method | |
| CN110912386B (en) | Active discharge circuit | |
| CN112152478A (en) | Characteristic current generating circuit | |
| CN110581541A (en) | surge current suppression circuit with isolation control | |
| CN210640722U (en) | Battery switch circuit and power supply management system comprising same | |
| CN215733481U (en) | Optimized reverse connection prevention protection and impact current suppression circuit | |
| CN217741300U (en) | Short-circuit protection circuit and system | |
| CN204216780U (en) | A kind of DC bus soft start circuit of uninterrupted power supply | |
| CN108683153B (en) | Protection circuit capable of automatically recovering | |
| CN204216598U (en) | Battery charging and discharging device and management circuit | |
| CN213879275U (en) | Circuit for limiting impact current | |
| CN209217706U (en) | Surge current suppression circuit | |
| CN112713762A (en) | Power supply circuit | |
| CN213521289U (en) | Input surge current suppression device | |
| CN213094086U (en) | Characteristic current generating circuit | |
| CN110445360A (en) | Direct-current power supply charging circuit and direct-current power supply charging equipment | |
| CN204441860U (en) | For protective circuit and the wireless power supply of wireless power supply | |
| CN219268715U (en) | Anti-starting surge current circuit | |
| CN212649100U (en) | Overvoltage protection module | |
| CN215452523U (en) | Battery pack protection circuit | |
| CN215646179U (en) | Power grounding wire fault protection circuit | |
| CN220042982U (en) | Lithium battery temperature protection circuit | |
| CN214900183U (en) | Power supply circuit of power switch and power supply system | |
| CN218276056U (en) | Solid-state relay capable of being turned off in power-off delay mode | |
| CN216598996U (en) | Direct current power supply with overvoltage surge and input surge current limiting capability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |