CN201274406Y - Overheat protection circuit and electric power system - Google Patents
Overheat protection circuit and electric power system Download PDFInfo
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- CN201274406Y CN201274406Y CNU2008200956087U CN200820095608U CN201274406Y CN 201274406 Y CN201274406 Y CN 201274406Y CN U2008200956087 U CNU2008200956087 U CN U2008200956087U CN 200820095608 U CN200820095608 U CN 200820095608U CN 201274406 Y CN201274406 Y CN 201274406Y
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Abstract
Applicable to the field of power supplies, the utility model provides an over-temperature protection circuit and a power supply system. The over-temperature protection circuit comprises a control circuit and a detection circuit; wherein, the input end of the control circuit is connected with a power supply in order to control the on-off of the power supply; the input end of the detection circuit is connected with the power supply; the output end of the detection circuit is connected with the control end of the control circuit; and when detecting the over-temperature of the power supply, the detection circuit can output a control signal to the control circuit, so that the control circuit can control the power supply to be switched off. By detecting the temperature of the detected unit of the power supply, the over-temperature protection circuit can automatically switch off the power supply in order to protect the elements from being damaged when the temperature of the detected unit is too high.
Description
Technical field
The utility model belongs to field of power supplies, relates in particular to a kind of overheating protection circuit and power-supply system.
Background technology
Power supply in the existing LCD power-supply system directly to the subsequent conditioning circuit power supply, is not taked safeguard measure, because the factors such as aging and environment of components and parts can cause the temperature of components and parts too high; thereby components and parts have been damaged; even may cause power supply to catch fire, and cause fire, bring about great losses.
The utility model content
The purpose of this utility model is to provide a kind of overheating protection circuit, and being intended to solve does not have protective circuit to cause the impaired problem of components and parts in the existing power-supply system.
The utility model is achieved in that a kind of overheating protection circuit, comprising:
Control circuit, its input is connected with power supply, the break-make of control power supply;
Testing circuit, its input is connected with power supply, and its output is connected with the control end of described control circuit, detects the power supply temperature when too high, and the output control signal is given described control circuit, controls described power supply by described control circuit and turn-offs.
Another purpose of the present utility model is to provide a kind of power-supply system that adopts above-mentioned overheating protection circuit to realize.
The overheating protection circuit that the utility model provides is by the temperature of the detected unit of detection power supply, and when the temperature of detected unit is too high, thereby auto power off protection components and parts are not damaged.
Description of drawings
Fig. 1 is the modular structure figure of the overheating protection circuit that provides of the utility model embodiment;
Fig. 2 is the circuit diagram of the control circuit of the overheating protection circuit that provides of the utility model embodiment;
Fig. 3 is the circuit diagram of the testing circuit of the overheating protection circuit that provides of the utility model embodiment;
Fig. 4 is the overheating protection circuit circuit diagram that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The overheating protection circuit that the utility model embodiment provides is by the temperature of the detected unit of detection power supply, and when the temperature of detected unit is too high, thereby auto power off protection components and parts are not damaged.
The overheating protection circuit that the utility model embodiment provides is mainly used in power-supply system, and its modular structure for convenience of explanation, only shows the part relevant with the utility model embodiment as shown in Figure 1, and details are as follows.
In the utility model embodiment, the circuit of control circuit 21 comprises as shown in Figure 2: the first switching tube Q1, second switch pipe Q2, the 3rd switching tube Q5, second resistance R 2, first resistance R 3, the 3rd resistance R 13 and photoelectrical coupler U1; Wherein the base stage of the first switching tube Q1 is connected with power supply 1 by first resistance R 3, and its collector electrode is connected to the base stage of second switch pipe Q2, and its emitter is connected to the collector electrode of the triode among the photoelectrical coupler U1; The base stage of second switch pipe Q2 also is connected with power supply 1 by second resistance R 2, and its emitter is connected with power supply 1, and its collector electrode is electrically connected with subsequent conditioning circuit 3; The base stage of the 3rd switching tube Q5 is connected to a level controling signal source by the 3rd resistance R 13, its grounded emitter, and the negative electrode of the diode among its collector electrode and the photoelectrical coupler U1 is connected; The grounded collector of triode among the photoelectrical coupler U1, the anode of its diode connect a 5V power supply.As an embodiment of the present utility model, the first switching tube Q1, the 3rd switching tube Q5 are NPN type triode, and second switch pipe Q2 is the positive-negative-positive triode.
As an embodiment of the present utility model, control circuit 21 also comprises: the 4th resistance R 1, the 5th resistance R 7, the 6th resistance R 11, the 7th resistance R 12 and first capacitor C 1, wherein, one end of the 4th resistance R 1 is connected to the collector electrode of second switch pipe Q2, and the other end is connected to subsequent conditioning circuit 3 and passes through first capacitor C, 1 ground connection; One end of the 5th resistance R 7 is connected to the emitter of the first switching tube Q1, and the other end is connected to the collector electrode of the triode among the photoelectrical coupler U1; One end of the 6th resistance R 11 connects a 5V power supply, and the other end is connected to the anode of the diode among the photoelectrical coupler U1; One end of the 7th resistance R 12 is connected to the base stage of the 3rd switching tube Q5, other end ground connection.
In the utility model embodiment, the circuit of testing circuit 22 comprises as shown in Figure 3: lock-in circuit 221 and detecting element 222; Wherein, an end of detecting element 222 is connected to the detected unit of power supply 1, and the other end is connected to the input of lock-in circuit 221; The output of lock-in circuit 221 is connected to the control end of control circuit 21.As an embodiment of the present utility model, detecting element 222 is a thermistor.As an embodiment of the present utility model, the detected unit of power supply 1 can be fin or transformer.
In the utility model embodiment, lock-in circuit 221 comprises: the 4th switching tube Q3, the 5th switching tube Q4 and the 8th resistance R 4, wherein, the base stage of the 4th switching tube Q3 is connected to the control end of control circuit 21 by the 8th resistance R 4, its emitter is connected to the control end of control circuit 21, its grounded collector; The base stage of the 5th switching tube Q4 is connected with detecting element 222, its grounded emitter, and its collector electrode is connected to the base stage of the 4th switching tube Q3.As an embodiment of the present utility model, the 4th switching tube Q3 is the positive-negative-positive triode, and the 5th switching tube Q4 is a NPN type triode.
In the utility model embodiment, testing circuit 22 further comprises: the 9th resistance R 5, the tenth resistance R 6, the first divider resistance R9, the second divider resistance R10, second capacitor C 2, capacitor C 3 and voltage stabilizing circuit U2, wherein, the input end grounding of voltage stabilizing circuit U2, output is connected with the end of the second divider resistance R10, adjusts end by second capacitor C, 2 ground connection, also is connected with its output; The other end of the second divider resistance R10 is connected with the detected unit of power supply 1, and the detected unit of power supply 1 is also by capacitor C 3 ground connection; One end of the 9th resistance R 5 is connected to the input of described lock-in circuit 221, and also by the tenth resistance R 6 ground connection, the other end also is connected with power supply 1 by the detecting element 222 and the second divider resistance R10 by the first divider resistance R9 ground connection.
The circuit diagram of the overheating protection circuit that Fig. 4 provides for the utility model embodiment, the operation principle of describing overheating protection circuit referring now to Fig. 4 is as follows.
The base stage power supply that power supply 1 is given the first switching tube Q1 by first resistance R 3, at this moment, the first switching tube Q1 conducting; Power supply 1 is by the base stage power supply of second resistance R 2 to second switch pipe Q2, and at this moment, second switch pipe Q2 is in cut-off state; When level controling signal provided a low level, the 3rd switching tube Q5 was in cut-off state, and photoelectrical coupler U1 ends, and second switch pipe Q2 also is in cut-off state, did not therefore have power supply to supply with subsequent conditioning circuit 3; When level controling signal provides a high level, the 3rd switching tube Q5 conducting, photoelectrical coupler U1 conducting, the first switching tube Q1 is in normally on, the base stage of second switch pipe Q2 is drawn to be low level, second switch pipe Q2 conducting this moment, so power supply 1 has guaranteed the operate as normal of subsequent conditioning circuit 3 to subsequent conditioning circuit 3 power supplies.
Give in the process of subsequent conditioning circuit 3 normal power supplies at power supply 1; if thermistor R8 detects the temperature of detected unit when too high; the resistance of thermistor R8 can diminish; when the resistance of thermistor R8 is reduced to a certain degree; power supply 1 can be by the first divider resistance R9; the second divider resistance R10 dividing potential drop; carrying out voltage stabilizing by voltage stabilizing circuit U2 handles; and by the 9th resistance R 5 high level of base stage to the 5th switching tube Q4; the 5th switching tube Q4 conducting; the base voltage of the 4th switching tube Q3 is 0; the 4th switching tube RQ3 conducting; at this moment, it is low level that the conducting of the 4th switching tube RQ3 makes the base voltage of the switching tube Q1 that wins, therefore the first switching tube Q1; second switch pipe Q2 all is in cut-off state; power supply 1 stops to subsequent conditioning circuit 3 power supplies, thereby has reached the purpose of overtemperature protection.The lock-in circuit of being made up of the 4th switching tube Q3, the 5th switching tube Q4 is an endless loop circuit, and needing again, start could recover normal power supply.
In the utility model embodiment, lock-in circuit 221 can be set to reset circuit, and reset circuit can be metal-oxide-semiconductor.As an embodiment of the present utility model, the grid of metal-oxide-semiconductor is connected with detecting element, its source ground, and its drain electrode is connected to the control end of control circuit 21.When the grid of metal-oxide-semiconductor had a high level, the metal-oxide-semiconductor conducting was given control circuit by the drain electrode output control signal of metal-oxide-semiconductor, and the control power supply turn-offs; After the temperature of detected unit reduced gradually, the grid of metal-oxide-semiconductor was a low level, gave control circuit by the drain electrode output control signal of metal-oxide-semiconductor, the conducting once more of control power supply, thus recover normal power supply.
The overheating protection circuit that the utility model embodiment provides is by the temperature of the detected unit of detection power supply, and when the temperature of detected unit is too high, thereby auto power off protection components and parts are not damaged.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1, a kind of overheating protection circuit is characterized in that, described overheating protection circuit comprises:
Control circuit, its input is connected with power supply, the break-make of control power supply;
Testing circuit, its input is connected with power supply, and its output is connected with the control end of described control circuit, detects the power supply temperature when too high, and the output control signal is given described control circuit, controls described power supply by described control circuit and turn-offs.
2, overheating protection circuit as claimed in claim 1 is characterized in that, described control circuit comprises:
First switching tube, second switch pipe, the 3rd switching tube, first resistance, second resistance, the 3rd resistance and photoelectrical coupler;
The base stage of described first switching tube is connected with power supply by first resistance, and its collector electrode is connected to the base stage of described second switch pipe, and its emitter is connected to the collector electrode of the triode of described photoelectrical coupler;
The base stage of described second switch pipe is connected with power supply by second resistance, and its emitter is connected with power supply, and its collector electrode is connected with subsequent conditioning circuit as the output of described control circuit;
The base stage of described the 3rd switching tube is connected to a level controling signal source by described the 3rd resistance, its grounded emitter, and the negative electrode of the diode in its collector electrode and the described photoelectrical coupler is connected;
The grounded collector of triode in the described photoelectrical coupler, the anode of its diode connects a power supply.
3, overheating protection circuit as claimed in claim 1 is characterized in that, described control circuit also comprises:
The 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and first electric capacity;
One end of described the 4th resistance is connected to the collector electrode of described second switch pipe; The other end is connected with subsequent conditioning circuit, and by described first capacity earth;
One end of described the 5th resistance is connected to the emitter of described first switching tube, and the other end is connected to the collector electrode of the triode in the described photoelectrical coupler;
One termination, one power supply of described the 6th resistance, the other end is connected to the anode of the diode in the described photoelectrical coupler;
One end of described the 7th resistance is connected to the base stage of described the 3rd switching tube, other end ground connection.
4, overheating protection circuit as claimed in claim 1 is characterized in that, described testing circuit comprises:
Lock-in circuit and detecting element;
One end of described detecting element is connected to the detected unit of described power supply, and the other end is connected to the input of described lock-in circuit;
The output of described lock-in circuit is connected to the control end of described control circuit.
5, overheating protection circuit as claimed in claim 4 is characterized in that, described detected unit is fin or transformer.
6, overheating protection circuit as claimed in claim 4 is characterized in that, described lock-in circuit comprises:
The 4th switching tube, the 5th switching tube and the 8th resistance;
Described the 4th switching tube base stage be connected to the control end of described control circuit by described the 8th resistance, its emitter is connected to the control end of described control circuit, its collector electrode is connected to the base stage of described the 5th switching tube;
The base stage of described the 5th switching tube is connected with described detecting element, its grounded emitter, and its collector electrode is connected to the base stage of described the 4th switching tube.
7, overheating protection circuit as claimed in claim 4 is characterized in that, described testing circuit also comprises:
First divider resistance, second divider resistance, voltage stabilizing circuit, second electric capacity, the 3rd electric capacity, the 9th resistance and the tenth resistance;
The input end grounding of described voltage stabilizing circuit, its output is connected with described power supply by described second divider resistance, and it adjusts end by second capacity earth, also is connected with its output;
One end of described the 9th resistance is connected to the input of described lock-in circuit, and also by the tenth grounding through resistance, the other end also is connected with described power supply by described detecting element, second divider resistance by the first divider resistance ground connection.
8, overheating protection circuit as claimed in claim 1 is characterized in that, described testing circuit comprises:
Reset circuit and detecting element;
One end of described detecting element is connected to the detected unit of described power supply, and the other end is connected to the input of described reset circuit;
The output of described reset circuit is connected to the control end of described control circuit.
9, overheating protection circuit as claimed in claim 8 is characterized in that, described reset circuit comprises metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor is connected with described detecting element, its source ground, and its drain electrode is connected to the control end of described control circuit.
10, a kind of power-supply system that adopts any described overheating protection circuit of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200956087U CN201274406Y (en) | 2008-07-14 | 2008-07-14 | Overheat protection circuit and electric power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200956087U CN201274406Y (en) | 2008-07-14 | 2008-07-14 | Overheat protection circuit and electric power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201274406Y true CN201274406Y (en) | 2009-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200956087U Expired - Fee Related CN201274406Y (en) | 2008-07-14 | 2008-07-14 | Overheat protection circuit and electric power system |
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| CN (1) | CN201274406Y (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064719A (en) * | 2010-11-02 | 2011-05-18 | 深圳创维－Rgb电子有限公司 | LED (Light Emitting Diode) backlight power source circuit, backlight power source and multimedia device |
| CN102759414A (en) * | 2012-07-11 | 2012-10-31 | 曙光信息产业(北京)有限公司 | Circuit and method for realizing over-temperature protection |
| CN103175160A (en) * | 2011-12-20 | 2013-06-26 | 西安智海电力科技有限公司 | Power non-occupation fast assembling type light-emitting diode (LED) power supply |
| CN103175121A (en) * | 2011-12-20 | 2013-06-26 | 西安智海电力科技有限公司 | Automatic-control integrated radiation type light-emitting diode (LED) power supply |
| CN103175171A (en) * | 2011-12-20 | 2013-06-26 | 西安智海电力科技有限公司 | Vacant self-control heat-dissipation-type light-emitting diode (LED) power supply |
| CN103175169A (en) * | 2011-12-20 | 2013-06-26 | 西安智海电力科技有限公司 | Inductance power automatic control type light-emitting (LED) power source |
| CN104085189A (en) * | 2014-07-08 | 2014-10-08 | 北京美科艺数码科技发展有限公司 | Heating protective circuit |
| CN106026259A (en) * | 2016-06-26 | 2016-10-12 | 来安县新元机电设备设计有限公司 | Charging control circuit and charging device of electronic equipment |
| CN108123317A (en) * | 2016-11-28 | 2018-06-05 | 比亚迪股份有限公司 | For vehicle for electrical connection system and for arrangements of electric connection |
| CN108123341A (en) * | 2016-11-28 | 2018-06-05 | 比亚迪股份有限公司 | For the guard method for arrangements of electric connection and vehicle powering system of vehicle |
| CN110391641A (en) * | 2019-07-22 | 2019-10-29 | 金陵科技学院 | Overheat protector for motor and motor overheating protect control method |
| CN117977495A (en) * | 2024-04-01 | 2024-05-03 | 深圳市精科睿精密制品有限公司 | Overheat protection circuit for control board |
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2008
- 2008-07-14 CN CNU2008200956087U patent/CN201274406Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064719A (en) * | 2010-11-02 | 2011-05-18 | 深圳创维－Rgb电子有限公司 | LED (Light Emitting Diode) backlight power source circuit, backlight power source and multimedia device |
| CN103175160A (en) * | 2011-12-20 | 2013-06-26 | 西安智海电力科技有限公司 | Power non-occupation fast assembling type light-emitting diode (LED) power supply |
| CN103175121A (en) * | 2011-12-20 | 2013-06-26 | 西安智海电力科技有限公司 | Automatic-control integrated radiation type light-emitting diode (LED) power supply |
| CN103175171A (en) * | 2011-12-20 | 2013-06-26 | 西安智海电力科技有限公司 | Vacant self-control heat-dissipation-type light-emitting diode (LED) power supply |
| CN103175169A (en) * | 2011-12-20 | 2013-06-26 | 西安智海电力科技有限公司 | Inductance power automatic control type light-emitting (LED) power source |
| CN102759414A (en) * | 2012-07-11 | 2012-10-31 | 曙光信息产业(北京)有限公司 | Circuit and method for realizing over-temperature protection |
| CN104085189A (en) * | 2014-07-08 | 2014-10-08 | 北京美科艺数码科技发展有限公司 | Heating protective circuit |
| CN104085189B (en) * | 2014-07-08 | 2016-09-14 | 北京美科艺数码科技发展有限公司 | heating protection circuit |
| CN106026259A (en) * | 2016-06-26 | 2016-10-12 | 来安县新元机电设备设计有限公司 | Charging control circuit and charging device of electronic equipment |
| CN108123317A (en) * | 2016-11-28 | 2018-06-05 | 比亚迪股份有限公司 | For vehicle for electrical connection system and for arrangements of electric connection |
| CN108123341A (en) * | 2016-11-28 | 2018-06-05 | 比亚迪股份有限公司 | For the guard method for arrangements of electric connection and vehicle powering system of vehicle |
| CN108123341B (en) * | 2016-11-28 | 2021-01-01 | 比亚迪股份有限公司 | Power supply connection device for vehicle and protection method of vehicle power supply system |
| CN110391641A (en) * | 2019-07-22 | 2019-10-29 | 金陵科技学院 | Overheat protector for motor and motor overheating protect control method |
| CN110391641B (en) * | 2019-07-22 | 2024-04-09 | 金陵科技学院 | Motor overheat protector and motor overheat protection control method |
| CN117977495A (en) * | 2024-04-01 | 2024-05-03 | 深圳市精科睿精密制品有限公司 | Overheat protection circuit for control board |
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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 |
Granted publication date: 20090715 Termination date: 20150714 |
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| EXPY | Termination of patent right or utility model |