CN202190050U - Direct-current over-voltage and over-current protective circuit and direct-current power supply type electronic product - Google Patents
Direct-current over-voltage and over-current protective circuit and direct-current power supply type electronic product Download PDFInfo
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- CN202190050U CN202190050U CN2011203472129U CN201120347212U CN202190050U CN 202190050 U CN202190050 U CN 202190050U CN 2011203472129 U CN2011203472129 U CN 2011203472129U CN 201120347212 U CN201120347212 U CN 201120347212U CN 202190050 U CN202190050 U CN 202190050U
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Abstract
The utility model discloses a direct-current over-voltage and over-current protective circuit and a direct-current power supply type electronic product. The direct-current over-voltage and over-current protective circuit comprises a power supply input end used for receiving a direct-current power supply and a power supply output end used for outputting the direct-current power supply to a load, the power supply input end is connected with the power supply output end through a fuse, a voltage stabilizing circuit is connected to the power supply output end, and stabilized voltage value of the voltage stabilizing circuit is determined according to allowable voltage of safety power supply of the load. The direct-current over-voltage and over-flow protective circuit is simple and practical, and is applied to the direct-current power supply type electronic product. When the direct-current power supply accessing to the electronic product is over high or current in circuits is over high, the external direct-current power supply can be cut off quickly so as to protect the electronic product. Moreover, an alarm circuit can be designed for reminding users of changing corresponding power supplies by means of sound and light when the power supply is not compatible with the electronic product, and accordingly the electronic product is more humanized and convenient for users.
Description
Technical field
The utility model belongs to the power supply protection technical field, specifically, relates to a kind of direct current supply electronic product that realizes the circuit design of overcurrent and overvoltage protection and adopt said direct current over-voltage over-current protection circuit design for dc power supply.
Background technology
Existing direct current supply electronic product; For example mobile phone, video camera, notebook computer etc.; General all is to adopt the mode of external adapter to connect electric main; After through adapter line voltage being carried out rectification, decompression transformation and voltage stabilizing and handles, generating the desired low-voltage dc power supply of this electronic product is the product power supply.
Because present direct current supply electronic product; DC power supply for its access is not formulated unified standard in the industry; Therefore have various specification, the most common with the electronic product that requires to insert 12V or 5V direct current supply at present, this just requires must purchase polytype power supply adaptor simultaneously in user's the family; Such as 12V or 5V adapter etc., to satisfy the power demands of different electronic products in the users home.This just is easy to generate a problem: when user's mistake is inserted into the power supply adaptor of 12V on the electronic product that requires the 5V power supply, just cause the damage of 5V electronic product easily because of the over-voltage and over-current problem.Because the power interface of 5V and 12V can be general; Though the product of a company can select dissimilar power interfaces to avoid the generation of such incident; But; The electronic product of different manufacturers can not accomplish to only depend on the difference of power interface type to avoid the generation of this type of incident, so the problem of avoiding the wrong plug power supply to damage electronic product must be taked a method of effecting a permanent cure.
Summary of the invention
The purpose of the utility model is to provide a kind of direct current over-voltage over-current protection circuit, damages problem with the electronic product of avoiding occurring causing because of the misconnection power supply.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of direct current over-voltage over-current protection circuit; Comprise the power input and the power output end that is used for to load output direct current supply that are used to receive direct current supply; Said power input connects power output end through fuse; On said power output end, be connected with a voltage stabilizing circuit, the voltage stabilizing value of said voltage stabilizing circuit is confirmed according to the safe power supply voltage that load allows to insert.
Preferably, said fuse preferably adopts the restorability overcurrent fuse, to avoid changing components and parts.
Further, in said voltage stabilizing circuit, include a voltage stabilizing didoe, the negative electrode of said voltage stabilizing didoe connects power output end, plus earth.
Certainly, said voltage stabilizing circuit also can adopt the multipath voltage regulation diode to be composed in series, and after said multipath voltage regulation diode series connection, negative electrode is connected to described power output end, plus earth.In order when the overvoltage fault takes place, to play warning function, the two ends of one tunnel described voltage stabilizing didoe also are parallel with a warning circuit therein.
As the concrete establishment structure of said warning circuit, preferably adopt following three kinds of designs:
The luminous warning of the first can adopt the mode of light-emitting diode and current-limiting resistance series connection to design described warning circuit.
It two is audible alarms, can adopt the mode of buzzer and current-limiting resistance series connection to design realization.
It three is sound and light alarms, can adopt the mode of light-emitting diode, buzzer and current-limiting resistance series connection to carry out the concrete design of warning circuit.
Further again, said power input is through an electrochemical capacitor ground connection, with the spike noise in the filtering direct current supply.
Based on above-mentioned direct current over-voltage over-current protection circuit structure; The utility model also provides a kind of direct current supply electronic product that adopts said direct current over-voltage over-current protection circuit design; Comprise the power input and the power output end that is used for to load output direct current supply that are used to receive direct current supply; For load circuit is carried out over-voltage over-current protection; Said power input connects power output end through fuse, on said power output end, is connected with a voltage stabilizing circuit, and the voltage stabilizing value of said voltage stabilizing circuit is confirmed according to the safe power supply voltage that load allows to insert.
Further, said power input connects external adapter, receives the direct current supply of adapter output, is the electric in the electronic product.
Compared with prior art; The advantage and the good effect of the utility model are: the direct current over-voltage over-current protection circuit of the utility model is simple and practical; It is applied in the direct current supply electronic product; When the electric current in the excessive or circuit of the DC power supply in being linked into electronic product is excessive, can cut off outside direct current supply rapidly, the protection electronic product is avoided damaging.In addition, when not being inconsistent through the design warning circuit power supply that can also on electronic product, insert, the corresponding power supply of form reminding user to replace through sound and light alarm makes product have more hommization, and is user-friendly.
After the detailed description in conjunction with advantages the utility model execution mode, other characteristics of the utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the direct current over-voltage over-current protection circuit that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment with direct current over-voltage over-current protection circuit of warning function.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done explanation in further detail.
Embodiment one, and present embodiment is that example describes with the direct current supply electronic product.The direct current supply of supposing required by electronic product is provided by the power supply adaptor output of outside; For fear of when the misconnection adapter; Owing to the problem that is linked into the excessive product internal electronic device damage that causes of direct current supply in the electronic product; Present embodiment in the indoor design of this electronic product overcurrent-overvoltage protecting circuit, be connected between the power input and load circuit of electronic product, to play the function of the load circuit of electronic product inside being carried out overvoltage and overcurrent protection.
The over-voltage over-current protection circuit of present embodiment mainly is made up of fuse F1 and voltage stabilizing circuit; Wherein, Voltage stabilizing circuit can adopt multiple teaming method, such as adopting one road voltage stabilizing didoe VD1 to be connected between power output end Vout and the ground GND, referring to shown in Figure 1; Be connected between power output end Vout and the ground GND, after perhaps adopting multipath voltage regulation diode VD1, VD2 series connection referring to shown in Figure 2.(for the voltage stabilizing circuit that adopts the design of single channel voltage stabilizing didoe, said voltage stabilizing value is the reverse breakdown voltage value of said voltage stabilizing didoe to the voltage stabilizing value of said voltage stabilizing circuit; For the voltage stabilizing circuit that adopts multipath voltage regulation diode series design; Said voltage stabilizing value is the reverse breakdown voltage value sum of whole voltage stabilizing didoes) can confirm according to the safe power supply voltage that back level load allows to insert; Such as the maximum working voltage that can equal or be slightly less than load circuit, perhaps equal maximum supply power voltage that electronic product allows to insert etc.Here, described power input Vin is used for the outside power supply adaptor of when electronic product charging or plug-in work, pegging graft; Power output end Vout is used to connect the inner load circuit of electronic product, is used for to load circuit dc power supply being provided.
After between the power input Vin of electronic product and load circuit, having set up above-mentioned over-voltage over-current protection circuit; When the inner load circuit of electronic product such as is short-circuited at over current fault; The fuse F1 disconnection of can generating heat rapidly; And then cut off the power supply of external adapter to load circuit, and make the load circuit outage out of service, just play the protection electronic product thus and avoided the effect that overcurrent is damaged.During the adapter of the direct current supply that requires greater than this electronic product to insert when the output voltage of having pegged graft by error on the power input Vin of user at electronic product; Voltage stabilizing didoe VD1 (perhaps VD1 and VD2) reverse breakdown; The direct voltage that outputs to load circuit is carried out the clamper restriction, damage to avoid the load circuit overvoltage.Meanwhile; Because the overvoltage part is absorbed by voltage stabilizing didoe VD1 (perhaps VD1 and VD2) circuit; This can make the total current in the load circuit increase, when the electric current over insurance silk F1 in the circuit parameter is set the time, fuse F1 breaks off; Cut off the power supply of adapter, further to play the effect of protection electronic product to load circuit.
In the present embodiment, said fuse F1 preferably adopts the restorability overcurrent fuse to carry out circuit design.When the electric current in the electronic product is excessive when causing fuse F1 to break off; Such fuse can recover after after a while voluntarily; Thereby need not to change components and parts, guarantee that electronic product still can continuous firing after suffering the over-voltage and over-current fault, convenient for users to use.
In order to make the direct current supply that is input to load circuit more stable; Present embodiment also further is provided with an electrochemical capacitor C1 at the power input Vin of electronic product, and is as shown in Figure 1, the anodal power input Vin that connects; Minus earth GND is used to absorb the spike noise of importing power supply.
A kind of preferred design as present embodiment; For when user's misconnection power supply adaptor; Electronic product can carry out warning reminding automatically, and present embodiment has also further designed warning circuit in said overcurrent-overvoltage protecting circuit, referring to shown in Figure 2; Preferably be the basis, warning circuit is connected in parallel on wherein one the tunnel or the two ends of multipath voltage regulation diode (but can not be whole voltage stabilizing didoes) with the voltage stabilizing circuit that adopts the multipath voltage regulation diode to be composed in series.Said warning circuit can adopt multiple warning form, and such as luminous warning, audible alarm or sound and light alarm etc., present embodiment preferably adopts the mode of sound and light alarm to design warning circuit.
As shown in Figure 2, said warning circuit adopts the mode of LED 1, buzzer M1 and current-limiting resistance R1 series connection to realize sound and light alarm, is connected in parallel on the wherein two ends of one road voltage stabilizing didoe, for example is connected in parallel on the two ends of voltage stabilizing didoe VD2.When the user has inserted correct power supply adaptor on electronic product; The direct current supply that promptly is input to electronic product is (is example with 5V) just often; Fuse F1 conducting; Voltage stabilizing didoe VD1 and VD2 open circuit do not have electric current to flow through LED 1 and buzzer M1 this moment, and LED 1 is not all worked with buzzer M1.When user's misplug power supply adaptor; When causing the direct current supply overvoltage that is input to electronic product; When having inserted 12V or other greater than the power supply adaptor of 5V, fuse F1 conducting, voltage stabilizing didoe VD1 and VD2 reverse breakdown; On the one hand clamper is carried out in the direct current supply that outputs to load circuit, the load circuit of rear end can not damaged in overvoltage; On the other hand because the conducting of voltage stabilizing didoe VD1, make the electric current warning circuit of flowing through, this moment, LED 1 beginning was luminous; Buzzer M1 begins to pipe; The overvoltage fault takes place in the prompting user, and whether the power supply adaptor that needs inspection to insert is correct, in time changes power supply.Voltage stabilizing didoe VD2 carries out clamper to the voltage that is applied to the warning circuit two ends simultaneously in circuit; Current-limiting resistance R1 limits the electric current that flows through LED 1 and buzzer M1; Through regulating the parameter value of voltage stabilizing didoe VD2 and current-limiting resistance R1, so that LED 1 can operate as normal when the overvoltage fault takes place with buzzer M1.Meanwhile, owing to the overvoltage part is absorbed by voltage stabilizing didoe VD1 and VD2 circuit, thereby total current is increased, surpassed the parameter that is provided with of fuse F1, fuse F1 action is cut off the electricity supply, and avoids causing the damage of electronic product.Owing to used the restorability fuse, after after a while, fuse meeting self-recovery need not to change.In this process, if the user finds the overvoltage fault, in time adjusted the input power supply, then electronic product can return to normal operating state; If still be in overvoltage condition after changing power supply, then repeat said process, carry out warning reminding once more.Not only guarantee the Electrical Safety of electronic product thus, also shown the humanization design concept of electronic product simultaneously, made things convenient for user's daily use.
Certainly; In said warning circuit, also can only select to be provided with LED 1 (promptly saving buzzer M1); With the two ends that are connected in parallel on voltage stabilizing didoe VD2 after current-limiting resistance R1 connects; Through the parameter of configuration voltage stabilizing didoe VD2 and current-limiting resistance R1, just can make LED 1 operate as normal when the overvoltage fault takes place, carry out luminous warning.
Same; Also can in said warning circuit, only select to be provided with buzzer M1 (promptly saving LED 1); With the two ends that are connected in parallel on voltage stabilizing didoe VD2 after current-limiting resistance R1 connects; Through the parameter of configuration voltage stabilizing didoe VD2 and current-limiting resistance R1,, realize audible alarm so that buzzer M1 gets into normal operating state when the overvoltage fault takes place.
Different type of alarms go for different application environments, and suitable type of alarm can specifically be selected according to the practical application of electronic product by production firm.Certainly, present embodiment is not limited in above giving an example to the physical circuit establishment form that type of alarm and type of alarm of the same race adopted.
Should be noted that; The over-voltage over-current protection circuit that present embodiment proposed not only is applicable to present direct current supply electronic product; As long as being arranged, the wrong DC power supply of confession cause all circuit of damage of product risk to increase foregoing circuit, so that back-end circuit is protected at front end.
Certainly; Above-mentioned explanation is not to be the restriction to the utility model; The utility model also be not limited in above-mentioned for example, variation, remodeling, interpolation or replacement that those skilled in the art are made in the essential scope of the utility model also should belong to the protection range of the utility model.
Claims (10)
1. direct current over-voltage over-current protection circuit; It is characterized in that: comprise the power input and the power output end that is used for to load output direct current supply that are used to receive direct current supply; Said power input connects power output end through fuse; On said power output end, be connected with a voltage stabilizing circuit, the voltage stabilizing value of said voltage stabilizing circuit is confirmed according to the safe power supply voltage that load allows to insert.
2. direct current over-voltage over-current protection circuit according to claim 1 is characterized in that: in said voltage stabilizing circuit, include a voltage stabilizing didoe, its negative electrode connects described power output end, plus earth.
3. direct current over-voltage over-current protection circuit according to claim 1 is characterized in that: in said voltage stabilizing circuit, include the multipath voltage regulation diode, after the said multipath voltage regulation diode series connection, negative electrode connects described power output end, plus earth.
4. direct current over-voltage over-current protection circuit according to claim 3 is characterized in that: the two ends of one tunnel described voltage stabilizing didoe are parallel with a warning circuit therein.
5. direct current over-voltage over-current protection circuit according to claim 4 is characterized in that: said warning circuit is in series by light-emitting diode or buzzer and current-limiting resistance.
6. direct current over-voltage over-current protection circuit according to claim 4 is characterized in that: said warning circuit is in series by light-emitting diode, buzzer and current-limiting resistance.
7. according to each described direct current over-voltage over-current protection circuit in the claim 1 to 6, it is characterized in that: said fuse is the restorability overcurrent fuse.
8. according to each described direct current over-voltage over-current protection circuit in the claim 1 to 6, it is characterized in that: said power input is through an electrochemical capacitor ground connection.
9. a direct current supply electronic product is characterized in that: comprise like the described direct current over-voltage over-current protection circuit of each claim in the claim 1 to 8.
10. direct current supply electronic product according to claim 9 is characterized in that: said power input connects external adapter, receives the direct current supply of adapter output, is the electric in the electronic product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203472129U CN202190050U (en) | 2011-09-16 | 2011-09-16 | Direct-current over-voltage and over-current protective circuit and direct-current power supply type electronic product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203472129U CN202190050U (en) | 2011-09-16 | 2011-09-16 | Direct-current over-voltage and over-current protective circuit and direct-current power supply type electronic product |
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| Publication Number | Publication Date |
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| CN202190050U true CN202190050U (en) | 2012-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203472129U Expired - Fee Related CN202190050U (en) | 2011-09-16 | 2011-09-16 | Direct-current over-voltage and over-current protective circuit and direct-current power supply type electronic product |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780071A (en) * | 2014-01-21 | 2014-05-07 | 广东易事特电源股份有限公司 | Overvoltage protective device and photovoltaic power generation system |
| CN104122939A (en) * | 2013-04-23 | 2014-10-29 | 英业达科技有限公司 | Server system |
| CN104466933A (en) * | 2013-09-18 | 2015-03-25 | 深圳市海洋王照明工程有限公司 | Energy-limiting explosion-proof circuit |
-
2011
- 2011-09-16 CN CN2011203472129U patent/CN202190050U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122939A (en) * | 2013-04-23 | 2014-10-29 | 英业达科技有限公司 | Server system |
| CN104466933A (en) * | 2013-09-18 | 2015-03-25 | 深圳市海洋王照明工程有限公司 | Energy-limiting explosion-proof circuit |
| CN104466933B (en) * | 2013-09-18 | 2018-11-06 | 深圳市海洋王照明工程有限公司 | A kind of limit energy intrinsically safe circuit |
| CN103780071A (en) * | 2014-01-21 | 2014-05-07 | 广东易事特电源股份有限公司 | Overvoltage protective device and photovoltaic power generation system |
| CN103780071B (en) * | 2014-01-21 | 2016-08-17 | 广东易事特电源股份有限公司 | A kind of over-pressure safety device and photovoltaic generating system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120411 Termination date: 20190916 |