CN203674691U - Undervoltage and overvoltage protection circuit for power supply circuit - Google Patents
Undervoltage and overvoltage protection circuit for power supply circuit Download PDFInfo
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- CN203674691U CN203674691U CN201320854805.3U CN201320854805U CN203674691U CN 203674691 U CN203674691 U CN 203674691U CN 201320854805 U CN201320854805 U CN 201320854805U CN 203674691 U CN203674691 U CN 203674691U
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Abstract
The utility model discloses an undervoltage and overvoltage protection circuit for a power supply circuit. The undervoltage and overvoltage protection circuit is coupled to an external power supply and an external circuit and is composed of a protection unit and a control unit. The protection unit is coupled to the external power supply and the control unit and is used for clamping or dividing supply voltage when the external power supply is in an undervoltage or overvoltage state and transmitting current corresponding to processed voltage to the control unit. The control unit is coupled to the protection unit and the external circuit and is used for receiving current transmitted from the protection unit in order to power the external circuit. Furthermore, the control unit cuts off the coupled connection between the undervoltage and overvoltage protection circuit and the external circuit when the value of the received current transmitted from the protection unit is less than a minimum turn-off current in order to carry out undervoltage protection on the external circuit, and cuts off the coupled connection between the undervoltage and overvoltage protection circuit and the external circuit when the value of the received current transmitted from the protection unit is more than a maximum turn-off current in order to carry out overvoltage protection on the external circuit. The undervoltage and overvoltage protection circuit resolves a problem of undervoltage and overvoltage protection for a switching power supply circuit.
Description
Technical field
The utility model relates to electronic circuit field, specifically, relates to a kind of under-voltage overvoltage crowbar for power circuit.
Background technology
At present, along with developing rapidly of semiconductor technology, the use of integrated circuit has spread all over every field, especially for the switching circuit of power supply control class, as: DC-DC circuit (miniaturization switching power circuit), has been widely used in the fields such as power electronics, military project, scientific research, industrial control equipment, communication apparatus, instrument and meter, switching equipment, access device, mobile communication, router communication, Industry Control, automotive electronics, Aero-Space.Have short, the feature such as reliability is high, system upgrade is easy of design cycle owing to adopting DC-DC circuit to set up power-supply system, the application of DC-DC circuit is more and more extensive.Along with a large amount of uses of semiconductor technology, encapsulation technology and high-frequency soft switch, the power density of DC-DC circuit is increasing, and conversion efficiency is more and more higher, applies also more and more simpler.
The large-scale corresponding industrial automation equipment of industrial production managerial demand is carried out, and the power switch circuits such as DC-DC circuit are also widely used in industrial automation equipment.But, being applied in severe industrial environment at industrial automation equipment, voltage on power cable conventionally exists and rises sharply or the phenomenon of rapid drawdown, the overvoltage causing thus and under-voltagely all may cause damage to DC-DC circuit.Wherein, under-voltagely may cause switching device overcurrent heating and burn switching tube; Overvoltage may cause switching tube breakdown and lost efficacy.
In prior art, by being set, corresponding undervoltage lockout circuit solves voltage swells or the impact of rapid drawdown on DC-DC circuit, but, traditional undervoltage lockout circuit complexity, ignore the power consumption of undervoltage lockout circuit, make DC-DC circuit in the time of normal work, still there is larger quiescent dissipation, so just reduced the efficiency of power supply, and invalid power consumption increases the burden of chip cooling, affected the stability of circuit, simultaneously, because components and parts usage quantity in circuit is more, the probability breaking down is higher, has reduced the reliability of circuit entirety.
Therefore, how to solve the problem for the under-voltage overvoltage protection of switching power circuit, just become technical problem urgently to be resolved hurrily.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of under-voltage overvoltage crowbar for power circuit, to solve the problem for the under-voltage overvoltage protection of switching power circuit.
For solving the problems of the technologies described above, the utility model provides a kind of under-voltage overvoltage crowbar for power circuit, couples mutually with external power source and external circuit, it is characterized in that, comprising: protected location and control unit, wherein,
Described protected location, couple mutually with described external power source and control unit, during for or power supply overvoltage under-voltage in the power supply of described external power source, supply power voltage is carried out to clamper processing or voltage division processing, will with process after the corresponding electric current of voltage be sent to described control unit;
Described control unit, couple mutually with described protected location and external circuit, be that described external circuit is powered for the electric current that receives described protected location transmission, simultaneously, in the time that the current value of the described protected location transmission receiving is less than minimum cut-off current value, shutoff couples with described external circuit, to described external circuit under-voltage protection; In the time that the current value of the described protected location transmission receiving is greater than the highest cut-off current value, shutoff couples with described external circuit, to described external circuit overvoltage protection.
Preferably, described protected location, is made up of the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, voltage-stabilizing device and switching device, wherein,
Described the first resistance couples mutually with described external power source, this first resistance and the 4th resistance, the second resistance mixed connection simultaneously couples, this second resistance is connected with described switching device, described switching device couples mutually with described control unit again, in the time that the power supply of described external power source is under-voltage, after described the first resistance and the 4th electric resistance partial pressure and described the second resistance current limliting, by described switching device, supply power voltage is carried out to voltage division processing again, the supply current of described control unit is limited in to preset safety electric flow valuve;
Described the 3rd resistance couples mutually with described external power source, the 3rd resistance and described the 5th resistance, voltage-stabilizing device mixed connection simultaneously couples, described the 5th resistance couples mutually with described control unit again, in the time of power supply overvoltage, after described the 3rd resistance and the 5th resistance current limliting, by described voltage-stabilizing device, supply power voltage is carried out to clamper processing, the described supply current of described control unit is clamped down in preset safety electric flow valuve.
Preferably, described preset safety electric flow valuve, is further:
The normal operation of device and lower than causing device in circuit to cross the current value of cause thermal damage in circuit.
Preferably, described the second resistance, the 3rd resistance and the 5th resistance, be further current-limiting resistance.
Preferably, described the first resistance and the 4th resistance, be further divider resistance.
Preferably, described voltage-stabilizing device, further for having the voltage-stabiliser tube of clamper.
Preferably, described switching device, further for having the triode of contactor conducting.
Compared with prior art, a kind of under-voltage overvoltage crowbar for power circuit described in the utility model, has reached following effect:
1) the utility model, by the Real-Time Monitoring to voltage in circuit, can be known in time rising sharply or rapid drawdown of voltage, and in the time of overtension, circuit be turn-offed, and makes it be no more than the ceiling voltage that circuit can bear; In the time of brownout, circuit is turn-offed, can not cause the phenomenon of overcurrent heating, thereby efficiently solve the problem for the under-voltage overvoltage protection of switching power circuit.
2) it is less that the utility model uses device, simple structure, and reliability is high, in effectively carrying out under-voltage overvoltage protection, has also reduced manufacturing cost.
Brief description of the drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a part of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structured flowchart of the under-voltage overvoltage crowbar for power circuit described in the utility model embodiment mono-.
Fig. 2 is the structured flowchart of switching power source control circuit of the prior art.
Fig. 3 is the structured flowchart of the switching power source control circuit described in the utility model embodiment bis-.
Fig. 4 is the concrete application circuit of the under-voltage overvoltage crowbar for power circuit described in the utility model embodiment bis-.
Embodiment
Censure specific components as used some vocabulary in the middle of specification and claim.Those skilled in the art should understand, and hardware manufacturer may be called same assembly with different nouns.This specification and claims are not used as distinguishing the mode of assembly with the difference of title, but the difference in function is used as the criterion of distinguishing with assembly.If " comprising " mentioned in the middle of specification and claim is in the whole text an open language, therefore should be construed to " comprise but be not limited to "." roughly " refer to that in acceptable error range, those skilled in the art can solve the technical problem within the scope of certain error, reach described technique effect substantially.In addition, " couple " word and comprise directly any and electric property coupling means indirectly at this.Therefore, be coupled to one second device if describe a first device in literary composition, represent that described first device can directly be electrically coupled to described the second device, or be indirectly electrically coupled to described the second device by other devices or the means that couple.Specification subsequent descriptions is for implementing preferred embodiments of the present utility model, and right described description is to illustrate that rule of the present utility model is object, not in order to limit scope of the present utility model.Protection range of the present utility model is when being as the criterion depending on the claims person of defining.
Below in conjunction with accompanying drawing, the utility model is described in further detail, but not as to restriction of the present utility model.
Embodiment mono-
As shown in Figure 1, be a kind of under-voltage overvoltage crowbar for power circuit described in the utility model embodiment mono-, couple mutually with external power source and external circuit, comprising: protected location 101 and control unit 102, wherein,
Described protected location 101, couple mutually with described external power source and control unit 102, during for or power supply overvoltage under-voltage in the power supply of described external power source, supply power voltage is carried out to clamper processing or voltage division processing, will with process after the corresponding electric current of voltage be sent to described control unit 102;
Described control unit 102, couple mutually with described protected location 101 and external circuit, be that described external circuit is powered for receiving the electric current that described protected location 101 sends, simultaneously, when the current value sending when the described protected location 101 receiving is less than minimum cut-off current value, shutoff couples with described external circuit, to described external circuit under-voltage protection; When the current value sending when the described protected location 101 receiving is greater than the highest cut-off current value, turn-off and the coupling of described external circuit, to described external circuit overvoltage protection.
In the present embodiment; described protected location 101; be specifically as follows the corresponding circuit structure being formed by the circuit elements device with current limliting, dividing potential drop and clamper function; certainly; it will be appreciated by those skilled in the art that; described protected location 101 can also, for having integrated chip or the device of foregoing circuit function, not form restriction of the present utility model at this.
Described control unit 102; be specifically as follows the control device of Switching Power Supply; when the described electric current flowing through from described protected location 101 is too high or height; representing the height of outer power voltage; this voltage all can impact described external circuit; even cause the damage of external circuit; therefore described control unit 102 judges according to the minimum and the highest cut-off current value arranging and the electric current that flows into described control unit 102; and carry out the corresponding operation of turn-offing, to realize under-voltage protection and the overvoltage protection to described external circuit.Certainly, described control unit 102 is turn-offing with after being connected of described external circuit, and current value returns in safe range, and described control unit 102 can recovery and being connected of external circuit.
In the present embodiment; described protected location 101 specifically can be made up of divider resistance, current-limiting resistance, voltage-stabilizing device (as: voltage-stabiliser tube) and switching device (as: triode), and described control unit 102 specifically can be made up of switch power controller part (as: the switch power controller part that model is DPA423).
Particularly, described protected location 101 is made up of the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, voltage-stabilizing device and switching device, wherein,
Described the first resistance couples mutually with described external power source, this first resistance and the 4th resistance, the second resistance mixed connection simultaneously couples, this second resistance is connected with described switching device, described switching device couples mutually with described control unit 202 again, in the time of the power supply overvoltage of described external power source, after described the first resistance and the 4th electric resistance partial pressure and described the second resistance current limliting, again by described switching device conducting, thereby produce an electric current, the supply current of described control unit 102 is limited in to preset safety electric flow valuve, and then turn-offs whole circuit;
Described the 3rd resistance couples mutually with described external power source, the 3rd resistance and described the 5th resistance, voltage-stabilizing device mixed connection simultaneously couples, described the 5th resistance couples mutually with described control unit 102 again, in the time that power supply is under-voltage, after described the 3rd resistance and the 5th resistance current limliting, by described voltage-stabilizing device, supply power voltage is carried out to clamper processing, the described supply current of described control unit 102 is clamped down in preset safety, and then turn-off whole circuit values.
The described minimum cut-off current value of described control unit 102 is 50uA, and the highest described cut-off current value is 135uA, and certainly, minimum cut-off current value and the highest cut-off current value in described control unit 102 can be adjusted according to the needs in practical application.
Embodiment bis-
Now, in conjunction with Fig. 2 to 4, the concrete application of the described under-voltage overvoltage crowbar for power circuit is described:
As shown in Figure 2, in the prior art, although the control that the switch power controller part that is DPA423 by model in switching power source control circuit turn-offs or opens whole circuit,, the overvoltage of input voltage or under-voltage, can cause the malfunctioning of DPA423 even to damage.Therefore, in circuit structure, add under-voltage and overvoltage crowbar, as shown in Figure 3.
In practical application, the corresponding side circuit of the circuit block diagram shown in Fig. 3 as shown in Figure 4, for the described under-voltage overvoltage crowbar 20 for power circuit is at side circuit corresponding to concrete application, wherein,
R1 and R4 are divider resistance, and R2, R3 and R5 are current-limiting resistance, and D3 is the voltage-stabiliser tube with clamping action, and Q1 is the triode with contactor conducting effect, and U2 is the switch power controller part of DPA423 type.
Under-voltage protection structure is made up of R3, R5 and D3, and overvoltage protection structure is made up of R1, R2, R4 and Q1.
Particularly:
For the under-voltage situation of power supply, voltage can reduce gradually from higher magnitude of voltage, in circuit as shown in Figure 4, under-voltage locking is by R3, R5, D3 and U2 have coordinated, if can make the electric current that flows into U2 crus secunda exceed 135uA at the higher D3 of not having of voltage ratio, thereby can cause turn-offing the MOSFET(metal-oxide layer semiconductcor field effect transistor of U2 inside), so D3 can make voltage clamping at a reduced levels, thereby in the time that input voltage uprises, ensure that the electric current that flows into U2 crus secunda can not exceed 135uA, along with the reduction gradually of input voltage, the electric current that flows into U2 crus secunda diminishes gradually, in the time that inflow U2 crus secunda is less than 50uA, the inner MOSFET of U2 turn-offs, thereby reach the function of under-voltage protection.
For the situation of power supply overvoltage; voltage can raise gradually from lower magnitude of voltage, and in circuit as shown in Figure 4, over-voltage locking has been coordinated by R1, R4, D3, R2, Q1 and U2; input voltage is by R1 and R4 dividing potential drop; Q1 conducting in the time that the voltage of getting exceedes 0.6V, because the voltage of the first pin of U2 is 5.8V, and crus secunda voltage is 2.6V; so in the time of Q1 conducting; when having met electric current that U2 crus secunda flows into and being greater than 135uA, the inner MOSFET of U2 turn-offs, thereby has completed overvoltage protection.
In the present embodiment, can adjust by the value of change R3 and R5 the threshold value of under-voltage protection, can adjust the threshold value of overvoltage protection by adjusting R1 and R4, wherein, the minimum value of under-voltage protection can be low to moderate 15V, the highest 80V that is no more than of overvoltage protection.
Compared with prior art, a kind of under-voltage overvoltage crowbar for power circuit described in the utility model, has reached following effect:
1) the utility model, by the Real-Time Monitoring to voltage in circuit, can be known in time rising sharply or rapid drawdown of voltage, and in the time of overtension, voltage be carried out to clamper, makes it be no more than the ceiling voltage that circuit can bear; In the time of brownout, circuit is turn-offed, can not cause the phenomenon of overcurrent heating, thereby efficiently solve the problem for the under-voltage overvoltage protection of switching power circuit.
2) it is less that the utility model uses device, simple structure, and reliability is high, in effectively carrying out under-voltage overvoltage protection, has also reduced manufacturing cost.
Above-mentioned explanation illustrates and has described some preferred embodiments of the present utility model, but as previously mentioned, be to be understood that the utility model is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, amendment and environment, and can, in utility model contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not depart from spirit and scope of the present utility model, all should be in the protection range of the utility model claims.
Claims (7)
1. for a under-voltage overvoltage crowbar for power circuit, couple mutually with external power source and external circuit, it is characterized in that, comprising: protected location and control unit, wherein,
Described protected location, couple mutually with described external power source and control unit, during for or power supply overvoltage under-voltage in the power supply of described external power source, supply power voltage is carried out to clamper processing or voltage division processing, will with process after the corresponding electric current of voltage be sent to described control unit;
Described control unit, couple mutually with described protected location and external circuit, be that described external circuit is powered for the electric current that receives described protected location transmission, simultaneously, in the time that the current value of the described protected location transmission receiving is less than minimum cut-off current value, shutoff couples with described external circuit, to described external circuit under-voltage protection; In the time that the current value of the described protected location transmission receiving is greater than the highest cut-off current value, shutoff couples with described external circuit, to described external circuit overvoltage protection.
2. the under-voltage overvoltage crowbar for power circuit as claimed in claim 1, is characterized in that, described protected location is made up of the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, voltage-stabilizing device and switching device, wherein,
Described the first resistance couples mutually with described external power source, this first resistance and the 4th resistance, the second resistance mixed connection simultaneously couples, this second resistance is connected with described switching device, described switching device couples mutually with described control unit again, in the time that the power supply of described external power source is under-voltage, after described the first resistance and the 4th electric resistance partial pressure and described the second resistance current limliting, by described switching device, supply power voltage is carried out to voltage division processing again, the supply current of described control unit is limited in to preset safety electric flow valuve;
Described the 3rd resistance couples mutually with described external power source, the 3rd resistance and described the 5th resistance, voltage-stabilizing device mixed connection simultaneously couples, described the 5th resistance couples mutually with described control unit again, in the time of power supply overvoltage, after described the 3rd resistance and the 5th resistance current limliting, by described voltage-stabilizing device, supply power voltage is carried out to clamper processing, the described supply current of described control unit is clamped down in preset safety electric flow valuve.
3. the under-voltage overvoltage crowbar for power circuit as claimed in claim 2, is characterized in that, described preset safety electric flow valuve, is further:
The normal operation of device and lower than causing device in circuit to cross the current value of cause thermal damage in circuit.
4. the under-voltage overvoltage crowbar for power circuit as claimed in claim 2, is characterized in that, described the second resistance, the 3rd resistance and the 5th resistance are further current-limiting resistance.
5. the under-voltage overvoltage crowbar for power circuit as claimed in claim 2, is characterized in that, described the first resistance and the 4th resistance are further divider resistance.
6. the under-voltage overvoltage crowbar for power circuit as claimed in claim 2, is characterized in that, described voltage-stabilizing device, further for having the voltage-stabiliser tube of clamper.
7. the under-voltage overvoltage crowbar for power circuit as claimed in claim 2, is characterized in that, described switching device, further for having the triode of contactor conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320854805.3U CN203674691U (en) | 2013-12-23 | 2013-12-23 | Undervoltage and overvoltage protection circuit for power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320854805.3U CN203674691U (en) | 2013-12-23 | 2013-12-23 | Undervoltage and overvoltage protection circuit for power supply circuit |
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| CN203674691U true CN203674691U (en) | 2014-06-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683207A (en) * | 2013-12-23 | 2014-03-26 | 北京易艾斯德科技有限公司 | Under-voltage and over-voltage protection circuit for power supply circuit |
| CN104967478A (en) * | 2015-06-30 | 2015-10-07 | 国网山东省电力公司济南供电公司 | Multipath light splitting adapter for testing optical power for intelligent transformer station |
| CN107487185A (en) * | 2016-12-26 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric automobile |
| CN108233338A (en) * | 2016-12-15 | 2018-06-29 | 博世力士乐(西安)电子传动与控制有限公司 | Converter power supply device and the frequency converter comprising the device |
-
2013
- 2013-12-23 CN CN201320854805.3U patent/CN203674691U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683207A (en) * | 2013-12-23 | 2014-03-26 | 北京易艾斯德科技有限公司 | Under-voltage and over-voltage protection circuit for power supply circuit |
| CN103683207B (en) * | 2013-12-23 | 2017-03-15 | 北京易艾斯德科技有限公司 | Under-voltage overvoltage crowbar for power circuit |
| CN104967478A (en) * | 2015-06-30 | 2015-10-07 | 国网山东省电力公司济南供电公司 | Multipath light splitting adapter for testing optical power for intelligent transformer station |
| CN108233338A (en) * | 2016-12-15 | 2018-06-29 | 博世力士乐(西安)电子传动与控制有限公司 | Converter power supply device and the frequency converter comprising the device |
| CN108233338B (en) * | 2016-12-15 | 2021-04-30 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter power supply device and frequency converter comprising same |
| CN107487185A (en) * | 2016-12-26 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric automobile |
| CN107487185B (en) * | 2016-12-26 | 2019-09-20 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric car |
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