CN215378445U - Protection circuit for case power supply - Google Patents
Protection circuit for case power supply Download PDFInfo
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- CN215378445U CN215378445U CN202121618776.1U CN202121618776U CN215378445U CN 215378445 U CN215378445 U CN 215378445U CN 202121618776 U CN202121618776 U CN 202121618776U CN 215378445 U CN215378445 U CN 215378445U
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Abstract
The application relates to a protection circuit for a case power supply, which relates to the technical field of case power supplies and comprises a power supply unit, a control unit and a control unit, wherein the power supply unit is configured as a power supply and used for outputting direct-current voltage; the current input end of the surge voltage suppression unit is electrically connected with the current output end of the power supply and is used for clamping and controlling the DC voltage generating the surge; the voltage reverse connection protection unit is electrically connected with the current input end of the surge voltage suppression unit and is used for preventing the damage of circuit system components caused by the reverse connection of the polarity of the input direct current voltage; the current input end of the first filtering unit is electrically connected with the current output end of the voltage reverse connection protection unit and is used for preliminarily filtering the direct-current voltage; and the current input end of the second filtering unit is configured to be electrically connected with the current output end of the first filtering unit, and the current output end of the second filtering unit is electrically connected with an external load and used for filtering the output direct current again. The protection device has the effect of protecting the circuit components.
Description
Technical Field
The application relates to the technical field of case power supplies, in particular to a protection circuit for a case power supply.
Background
The case power supply is a device which converts 220V alternating current into direct current and specially supplies power to computer accessories such as a mainboard, a driver, a display card and the like, is a hub for supplying power to all parts of a computer and is an important component of the computer.
When the power supply voltage of the chassis is unstable, for example, a surge voltage occurs, the surge voltage exceeds the normal operating voltage and may damage the circuit components powered by the power supply of the chassis, so that the voltage output by the power supply of the chassis needs to be adjusted, and improvement is urgently needed.
SUMMERY OF THE UTILITY MODEL
In order to improve the problem that case power output voltage is unstable and causes the damage to circuit components, this application provides a protection circuit for case power.
The application provides a protection circuit for quick-witted case power adopts following technical scheme:
a protection circuit for a case power supply comprises a power supply unit, a power supply unit and a control unit, wherein the power supply unit is configured as a power supply and used for outputting direct-current voltage;
the current input end of the surge voltage suppression unit is electrically connected with the current output end of the power supply and is used for clamping and controlling the DC voltage generating the surge;
the voltage reverse connection protection unit is electrically connected with the current input end of the surge voltage suppression unit and is used for preventing the damage of circuit system components caused by the reverse connection of the polarity of the input direct current voltage;
the current input end of the first filtering unit is electrically connected with the current output end of the voltage reverse connection protection unit and is used for preliminarily filtering the direct-current voltage;
and the current input end of the second filtering unit is configured to be electrically connected with the current output end of the first filtering unit, and the current output end of the second filtering unit is electrically connected with an external load and used for filtering the output direct current again.
By adopting the technical scheme, the direct current voltage generating surge is clamped and controlled by the surge voltage suppression unit, the condition that the surge voltage damages the circuit components of the protection circuit is reduced, the voltage protection unit is used for preventing the input direct current voltage from being reversely connected in polarity to damage the circuit system components, the first filtering unit and the second filtering unit are used for filtering the direct current voltage, and the protection capability of the circuit components is greatly improved.
Preferably, the surge voltage suppression unit includes a first bipolar TVS transient diode, one end of the first bipolar TVS transient diode is electrically connected to the current output terminal of the power supply, and the other end of the first bipolar TVS transient diode is grounded.
By adopting the technical scheme, the first bipolar TVS transient diode is used for clamping and controlling the DC voltage generating the surge, and the first bipolar TVS transient diode guides the surge into the ground, so that line components are protected.
Preferably, the reverse voltage protection unit includes a schottky diode D and a second bipolar TVS transient diode, an anode of the schottky diode D is electrically connected to a current output terminal of the power supply, and a cathode of the schottky diode D is electrically connected to a current input terminal of the first filtering unit.
By adopting the technical scheme, on one hand, after the voltage is reversely connected, the Schottky diode D is not conducted, so that the voltage reverse connection protection is realized; on the other hand, the residual surge voltage processed by the surge voltage suppression unit is clamped by the second bipolar TVS transient diode, so that the protection of line components is further improved.
Preferably, three schottky diodes D are provided, and the three schottky diodes D are connected in parallel in the same direction.
Through adopting above-mentioned technical scheme, schottky diode D is many son electrically conductive, has that the junction voltage drop is little, operating frequency is high, the effect that the electric current is big, and three schottky diode D syntropy is parallelly connected, and after one of them schottky diode D damaged, other schottky diode D can anyhow normally use.
Preferably, the first filtering unit includes a first electrolytic capacitor C and a capacitor C1 arranged in parallel.
By adopting the technical scheme, the electrolytic capacitor C has larger capacity, has poorer effect of absorbing higher harmonics or having a steep rising edge, and the capacitor C1 has better effect of absorbing higher harmonics.
Preferably, the second filtering unit comprises two capacitors C2 connected in parallel and two second electrolytic capacitors C connected in parallel.
By adopting the technical scheme, the filtering effect on the direct-current voltage is further improved.
Preferably, a filter inductor L is electrically connected between the current output end of the first filter unit and the current input end of the second filter unit.
By adopting the technical scheme, the filter inductor has the effects of direct current passing and alternating current blocking, so that the stability of the input direct current voltage is improved.
Preferably, a fuse FU is electrically connected between the current output end of the power supply unit and the current input end of the surge voltage suppression unit.
Through adopting above-mentioned technical scheme, when surge voltage was too big, burn out the whole protection circuit outage of fuse FU to protect circuit components and parts of protection circuit.
In summary, the present application includes at least one of the following beneficial technical effects:
the surge voltage suppression unit is used for clamping and controlling the direct current voltage generating the surge, the condition that the surge voltage damages the circuit components of the protection circuit is reduced, the voltage protection unit is used for preventing the input direct current voltage from being damaged due to reverse polarity, the first filtering unit, the filtering inductor L and the second filtering unit are used for filtering the direct current voltage, and the protection capability of the circuit components is greatly improved.
Drawings
Fig. 1 is a schematic diagram of a protection circuit mainly embodied for a power supply of a chassis according to an embodiment of the present application;
fig. 2 is a circuit diagram of a protection circuit mainly embodied for a power supply of a chassis according to an embodiment of the present application;
fig. 3 is a circuit diagram mainly embodying a surge voltage suppression unit in the present embodiment of the application;
fig. 4 is a schematic diagram mainly showing a structure of a reverse voltage protection unit according to an embodiment of the present application;
fig. 5 is a circuit diagram mainly embodying the first filtering unit and the second filtering unit in the embodiment of the present application.
Reference numerals: 1. a power supply unit; 11. a power supply; 2. a surge voltage suppression unit; 21. a first bipolar TVS transient diode; 3. the voltage reverse connection protection unit; 31. a second bipolar TVS transient diode; 4. a first filtering unit; 5. and a second filtering unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a protection circuit for a case power supply.
Referring to fig. 1, a protection circuit for a chassis power supply includes a power supply unit 1, a surge voltage suppression unit 2, a reverse voltage protection unit 3, a first filtering unit 4, and a second filtering unit 5, which are connected in series in sequence.
In the embodiment of the present application, the power supply unit 1 is configured as a power supply 11 for outputting a direct-current voltage. Since the power supply 11 may generate a surge voltage under the abnormal operation condition, the current input terminal of the surge voltage suppressing unit 2 is electrically connected to the current output terminal of the power supply 11, and is used for clamping and controlling the dc voltage generating the surge. In order to reduce the damage of the direct-current voltage reverse connection to the line components, the current input end of the voltage reverse connection unit is electrically connected with the current output end of the surge voltage suppression unit 2.
Referring to fig. 2, a fuse FU is electrically connected between the current output end of the power supply unit 1 and the current input end of the surge voltage suppression unit 2, and when the surge voltage is too large, the fuse FU is burned out to cut off the whole protection circuit, so that the circuit components of the protection circuit are protected.
When the direct current voltage supplies power to an external load, the current input end of the first filtering unit 4 is electrically connected with the current output end of the voltage reverse connection protection unit 3, the current input end of the second filtering unit 5 is configured to be electrically connected with the current output end of the first filtering unit 4, and the current output end of the second filtering unit is electrically connected with the external load and used for filtering the output direct current again, so that the stability of the direct current voltage is improved.
Referring to fig. 2 and 3, in particular, the surge suppressing unit 2 includes a first bipolar TVS transient diode 21, one end of the first bipolar TVS transient diode 21 is electrically connected to the current output terminal of the power supply 11, and the other end of the first bipolar TVS transient diode 21 is grounded.
Referring to fig. 2 and 4, the reverse voltage protection unit 3 includes three schottky diodes D connected in parallel in the same direction, and a second bipolar TVS transient diode 31 connected in parallel to the three schottky diodes D in parallel in the same direction, wherein an anode of the schottky diode D is electrically connected to a current output terminal of the power supply 11, and a cathode of the schottky diode D is electrically connected to a current input terminal of the first filter unit 4. When the voltage is reversely connected, the Schottky diode D is not conducted, so that reverse voltage connection protection is realized; on the other hand, the residual surge voltage processed by the surge voltage suppression unit 2 is clamped by the second bipolar TVS transient diode 31, so that the protection of the line component is further improved.
Referring to fig. 2 and 5, the first filtering unit 4 includes a first electrolytic capacitor C and a capacitor C1 arranged in parallel, and the second filtering unit 5 includes two capacitors C2 connected in parallel and two second electrolytic capacitors C connected in parallel. And a filter inductor L is electrically connected between the current output end of the first filter unit 4 and the current input end of the second filter unit 5.
The implementation principle of the embodiment of the application is as follows: when the power supply 11 generates surge voltage, the surge voltage suppression unit 2 is used for clamping and controlling the direct current voltage generating surge, so that the situation that the surge voltage damages the circuit components of the protection circuit is reduced, the voltage protection unit is used for preventing the input direct current voltage from being damaged due to reverse polarity, the first filtering unit 4, the filtering inductor L and the second filtering unit 5 are used for filtering the direct current voltage, and the protection capability of the circuit components is greatly improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A protection circuit for a chassis power supply, comprising:
a power supply unit (1) configured as a power supply source (11) for outputting a direct-current voltage;
the surge voltage suppression unit (2) is electrically connected with the current output end of the power supply (11) at the current input end and is used for clamping and controlling the DC voltage generating the surge;
the voltage reverse connection protection unit (3) is electrically connected with the current input end of the surge voltage suppression unit (2) and is used for preventing the damage of circuit system components caused by the reverse connection of the polarities of the input direct current voltages;
the current input end of the first filtering unit (4) is electrically connected with the current output end of the voltage reverse connection protection unit (3) and is used for preliminarily filtering direct-current voltage;
and the current input end of the second filtering unit (5) is configured to be electrically connected with the current output end of the first filtering unit (4), and the current output end of the second filtering unit is electrically connected with an external load and used for filtering the output direct current again.
2. The protection circuit for a power supply of a chassis of claim 1, wherein: the surge voltage suppression unit (2) comprises a first bipolar TVS transient diode (21), one end of the first bipolar TVS transient diode (21) is electrically connected with the current output end of the power supply (11), and the other end of the first bipolar TVS transient diode (21) is grounded.
3. The protection circuit for a power supply of a chassis of claim 1, wherein: the voltage reverse connection protection unit (3) comprises a Schottky diode D and a second bipolar TVS transient diode (31), the anode of the Schottky diode D is electrically connected with the current output end of the power supply (11), and the cathode of the Schottky diode D is electrically connected with the current input end of the first filtering unit (4).
4. A protection circuit for a power supply of a chassis according to claim 3, wherein: the Schottky diodes D are three and are connected in parallel in the same direction.
5. The protection circuit for a power supply of a chassis of claim 1, wherein: the first filtering unit (4) comprises a first electrolytic capacitor C and a capacitor C1 arranged in parallel.
6. The protection circuit for a power supply of a chassis of claim 1, wherein: the second filtering unit (5) comprises two capacitors C2 connected in parallel and two second electrolytic capacitors C connected in parallel.
7. The protection circuit for a power supply of a chassis of claim 1, wherein: and a filter inductor L is electrically connected between the current output end of the first filter unit (4) and the current input end of the second filter unit (5).
8. The protection circuit for a power supply of a chassis of claim 1, wherein: and a fuse FU is electrically connected between the current output end of the power supply unit (1) and the current input end of the surge voltage suppression unit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121618776.1U CN215378445U (en) | 2021-07-16 | 2021-07-16 | Protection circuit for case power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121618776.1U CN215378445U (en) | 2021-07-16 | 2021-07-16 | Protection circuit for case power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215378445U true CN215378445U (en) | 2021-12-31 |
Family
ID=79609669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121618776.1U Active CN215378445U (en) | 2021-07-16 | 2021-07-16 | Protection circuit for case power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215378445U (en) |
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2021
- 2021-07-16 CN CN202121618776.1U patent/CN215378445U/en active Active
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