CN102810854A - Protection circuit - Google Patents
Protection circuit Download PDFInfo
- Publication number
- CN102810854A CN102810854A CN2011101439934A CN201110143993A CN102810854A CN 102810854 A CN102810854 A CN 102810854A CN 2011101439934 A CN2011101439934 A CN 2011101439934A CN 201110143993 A CN201110143993 A CN 201110143993A CN 102810854 A CN102810854 A CN 102810854A
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- Prior art keywords
- power supply
- protective circuit
- protection circuit
- load
- fuse
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Abstract
The invention provides a protection circuit. An input end of the protection circuit is connected with a DC (Direct Current) power supply, an output end of the protection circuit is connected with a load, the protection circuit comprises a fuse, a diode and a capacitor, wherein the fuse is connected in the protection circuit in series, the diode is connected with the load in parallel, a cathode of the diode is connected with an anode of the DC power supply, and the capacitor is connected between the protection circuit and the ground. The protection circuit provided by the invention has the beneficial effect that the protection for various abnormal conditions such as over current, opposite phase and static of the power supply and the load can be realized. The protection circuit provided by the invention has the advantages that the circuit is simple and reliable, the cost is low, and the safety performance of the power supply and the load can be greatly increased.
Description
[technical field]
The present invention relates to the power electronics field of power supplies.
[background technology]
In electronic circuit, the power supply of electronic circuit connects instead owing to power supply usually, or because overcurrent or the static reason that electronic circuit (load) short circuit itself causes makes power supply or load circuit cause damage.
[summary of the invention]
For avoiding the damage of power supply or load circuit, the present invention provides a kind of protective circuit, and the power supply that solves electronic circuit connects instead owing to power supply, or because the situation that overcurrent that electronic circuit (load) short circuit itself causes or static cause damage.
Embodiments of the invention are achieved in that the input of protective circuit connects a direct current power supply, and the output of protective circuit connects a load, this protective circuit:
It comprises a fuse, a diode, a capacitor, and said fuse is series in the protective circuit; Diode is connected with the positive pole of power supply with load parallel connection and its negative electrode, and capacitor is connected between protective circuit and the earth.
The invention has the beneficial effects as follows that realization carries out multiple abnormal condition protections such as overcurrent, anti-phase and static to power supply source power supply and load.Circuit is simple and reliable, and cost is low, can improve power supply and payload security performance greatly.
[description of drawings]
Combine execution mode that the present invention is done further description with reference to the accompanying drawings.
Fig. 1 is a protective circuit schematic diagram of the present invention;
Fig. 2 is protective circuit forward power supply the principle figure of the present invention;
Fig. 3 connects the schematic diagram of inverse time for protective circuit electric power polarity of the present invention;
Schematic diagram when Fig. 4 receives electrostatic shock for protective circuit of the present invention.
[embodiment]
Below main accompanying drawings embodiment of the present invention.
As shown in Figure 1, a kind of protective circuit 200, it comprises a fuse 201, a diode 202, a capacitor 203; Fuse 201 is serially connected with in the protective circuit; Wherein, the input of protective circuit connects a direct current power supply 100, and the output of protective circuit connects a load 300; Diode 202 is connected with the positive pole of DC power supply 100 with load 300 parallel connections, its negative electrode, and capacitor 203 is connected between protective circuit and the earth.
As shown in Figure 2, during the forward power supply, current direction is shown in arrow among the figure.When load 300 short circuits, moment can produce very big electric current, and fuse 201 can break off or being connected of blocking-up power supply and its load immediately under the state of overcurrent, and power supply and load circuit are protected.
As shown in Figure 3, when error-polarity connection of power supply, promptly A, two inputs of B are connected with anodal with the negative pole of DC power supply 100 respectively; Circuit produces directional current; Electric current directly flows through diode 202, gets back to power supply 100 negative poles through fuse 201, produces overcurrent this moment; Fuse 201 breaks off or blocks the path between power supply and load, thus the power supply effect of being protected.
As shown in Figure 4, when circuit received electrostatic shock, the instantaneous pressure of static was with breakdown diode 202, and capacitor 203 is connected between the input B and the earth of protective circuit, and electrostatic induced current is discharged into the earth through capacitor 203, plays electrostatic protective function.
In the present embodiment, fuse 201 is a self-healing fuse.When producing overcurrent, electric current is locked in high-impedance state to fuse, and the blocking-up power supply is connected with its load.When cutting off the electricity supply or after overcurrent disappeared, fuse 201 recovered low resistive state.In addition, fuse 201 also can use other common irrecoverable fuse, when fuse fuses owing to overcurrent, must in time change in order to avoid influence circuit working.
In the present embodiment, diode 202 is the transient state diode.When diode 202 the two poles of the earth received reverse transient high voltages and impact, moment punctured, and becomes the reverse-conducting state, made high pressure moment be discharged into the earth through capacitor 203, protected power supply and load to avoid the damage of various surge pulses effectively.
In the present embodiment, capacitor 203 is the Y electric capacity of safety electric capacity, capacitor 203 ground connection, and can make static be released into the earth apace, circuit is realized electrostatic protection.
The invention has the beneficial effects as follows that realization carries out multiple abnormal condition protections such as overcurrent, anti-phase and static to power supply source power supply and load.Circuit is simple and reliable, and cost is low, can improve power supply and payload security performance greatly.
Enforcement of the present invention is not limited to the disclosed mode of above most preferred embodiment, and is all based on above-mentioned mentality of designing, simply deduces and replace, and the concrete protective circuit that obtains all belongs to enforcement of the present invention.
Claims (4)
1. protective circuit, the input of protective circuit connects a direct current power supply, and the output of protective circuit connects a load, it is characterized in that: it comprises a fuse, a diode, a capacitor, and said fuse is series in the protective circuit; Diode is connected with the positive pole of power supply with load parallel connection and its negative electrode, and capacitor is connected between protective circuit and the earth.
2. protective circuit according to claim 1 is characterized in that: described fuse is a self-healing fuse.
3. protective circuit according to claim 1 is characterized in that: described diode is the transient state diode.
4. protective circuit according to claim 1 is characterized in that: described electric capacity is the Y electric capacity of safety electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101439934A CN102810854A (en) | 2011-05-31 | 2011-05-31 | Protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101439934A CN102810854A (en) | 2011-05-31 | 2011-05-31 | Protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102810854A true CN102810854A (en) | 2012-12-05 |
Family
ID=47234486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101439934A Pending CN102810854A (en) | 2011-05-31 | 2011-05-31 | Protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102810854A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050965A (en) * | 2013-01-24 | 2013-04-17 | 河南安宏信息科技有限公司 | Reverse conversion circuit of bipolar power supply |
| CN103269190A (en) * | 2013-04-02 | 2013-08-28 | 江苏富天江电子电器有限公司 | Driver for driving direct current brushless motor for air-condition fan |
| CN103427811A (en) * | 2013-08-21 | 2013-12-04 | 罗斌 | Protective circuit for gas switch and trigger |
| CN106787826A (en) * | 2017-04-01 | 2017-05-31 | 广东商鼎智能设备有限公司 | Power panel and power panel system |
| CN106847640A (en) * | 2017-03-31 | 2017-06-13 | 广东商鼎智能设备有限公司 | Fuse board and fuse board system |
| CN107134751A (en) * | 2017-06-29 | 2017-09-05 | 贵阳永青仪电科技有限公司 | A kind of power source reverse connection protection circuit of high power load drive circuit |
| CN107168901A (en) * | 2016-03-08 | 2017-09-15 | 德昌电机(深圳)有限公司 | Mongline two-way communication circuit |
| CN110300480A (en) * | 2019-08-07 | 2019-10-01 | 苏州迪芬德物联网科技有限公司 | A kind of diode single fire line control circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201252397Y (en) * | 2008-07-22 | 2009-06-03 | 马国富 | Storage battery reverse connection protection circuit |
| CN201570860U (en) * | 2009-11-06 | 2010-09-01 | 深圳市同洲电子股份有限公司 | Direct current power circuit with reverse polarity protective function |
| CN201733077U (en) * | 2010-06-24 | 2011-02-02 | 深圳市中兴移动通信有限公司 | Battery protection circuit |
-
2011
- 2011-05-31 CN CN2011101439934A patent/CN102810854A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201252397Y (en) * | 2008-07-22 | 2009-06-03 | 马国富 | Storage battery reverse connection protection circuit |
| CN201570860U (en) * | 2009-11-06 | 2010-09-01 | 深圳市同洲电子股份有限公司 | Direct current power circuit with reverse polarity protective function |
| CN201733077U (en) * | 2010-06-24 | 2011-02-02 | 深圳市中兴移动通信有限公司 | Battery protection circuit |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050965A (en) * | 2013-01-24 | 2013-04-17 | 河南安宏信息科技有限公司 | Reverse conversion circuit of bipolar power supply |
| CN103269190A (en) * | 2013-04-02 | 2013-08-28 | 江苏富天江电子电器有限公司 | Driver for driving direct current brushless motor for air-condition fan |
| CN103427811A (en) * | 2013-08-21 | 2013-12-04 | 罗斌 | Protective circuit for gas switch and trigger |
| CN107168901A (en) * | 2016-03-08 | 2017-09-15 | 德昌电机(深圳)有限公司 | Mongline two-way communication circuit |
| CN107168901B (en) * | 2016-03-08 | 2021-06-25 | 德昌电机(深圳)有限公司 | Single-wire bidirectional communication circuit |
| CN106847640A (en) * | 2017-03-31 | 2017-06-13 | 广东商鼎智能设备有限公司 | Fuse board and fuse board system |
| CN106787826A (en) * | 2017-04-01 | 2017-05-31 | 广东商鼎智能设备有限公司 | Power panel and power panel system |
| CN106787826B (en) * | 2017-04-01 | 2023-10-31 | 广东商鼎智能设备有限公司 | Power panel and power panel system |
| CN107134751A (en) * | 2017-06-29 | 2017-09-05 | 贵阳永青仪电科技有限公司 | A kind of power source reverse connection protection circuit of high power load drive circuit |
| CN110300480A (en) * | 2019-08-07 | 2019-10-01 | 苏州迪芬德物联网科技有限公司 | A kind of diode single fire line control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121205 |