CN220139226U - Control circuit for over-temperature protection - Google Patents
Control circuit for over-temperature protection Download PDFInfo
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- CN220139226U CN220139226U CN202321682818.7U CN202321682818U CN220139226U CN 220139226 U CN220139226 U CN 220139226U CN 202321682818 U CN202321682818 U CN 202321682818U CN 220139226 U CN220139226 U CN 220139226U
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- 230000005669 field effect Effects 0.000 claims description 15
- 230000000087 stabilizing effect Effects 0.000 claims description 2
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- 101100401568 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) MIC10 gene Proteins 0.000 description 5
- 102100030393 G-patch domain and KOW motifs-containing protein Human genes 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses a control circuit for over-temperature protection, which comprises a control unit, wherein the control unit is in control connection with a temperature sensor through a two-wire bus; the switch assembly comprises a first device switch and a second device switch, and a plurality of connection points of the first device switch are respectively and electrically connected with the operation body, the power supply device and the second device switch; and the first difference trigger is electrically connected with the second device switch. The control unit controls the high level to be reduced to the low level so as to enable the voltage of the second device switch to be smaller than the starting voltage, and the second device switch at the moment enters a cut-off state, so that the current output by the power supply device cannot be supplied to the operating body through the first device switch, the operating body is stopped, and the operating temperature of the operating body is prevented from being too high, so that the damage condition is caused.
Description
Technical Field
The utility model relates to the technical field of control circuits, in particular to a control circuit for over-temperature protection.
Background
In some related technologies, most of the temperature difference hardware detection schemes of the running body react rapidly, but cannot interrupt the circuit according to the temperature threshold of the running body; for example, if the operating temperature of the operating body is too high, if the current output from the power supply device is not interrupted in time, the operating body is easily damaged.
Disclosure of Invention
In order to overcome the defects of the prior art, the embodiment of the utility model provides an over-temperature protection control circuit.
The technical scheme adopted for solving the technical problems is as follows:
a control circuit for over-temperature protection, the control circuit comprising:
the control unit is in control connection with the temperature sensor through a two-wire bus;
the switch assembly comprises a first device switch and a second device switch, and a plurality of connection points of the first device switch are respectively and electrically connected with the operation body, the power supply device and the second device switch;
and the first difference trigger is electrically connected with the second device switch.
As a preferable technical scheme of the utility model, the control circuit further comprises a first resistor and a second resistor;
the first resistor is arranged at a connection point between the first device switch and the second device switch;
the second resistor is arranged at a connection point between the power supply device and the first resistor.
As a preferable technical scheme of the utility model, the second device switch is electrically connected with the grounding terminal;
the control circuit further comprises a third resistor arranged at a connection point between the first differential trigger and the grounding terminal.
As a preferable technical scheme of the utility model, the control circuit further comprises a plurality of capacitors, wherein the capacitors are arranged at the connection points between the first device switch and the operation body;
a plurality of the capacitors are electrically connected to ground.
As a preferable technical scheme of the utility model, the first device switch comprises a zener diode, a first diode and a first field effect transistor; the voltage stabilizing diode is arranged at a connection point between the second device switch and the power supply device; the first diode is arranged at a connection point between the power supply device and the operation body; the first field effect transistor is arranged at a connection point between the power supply device and the operation body.
As a preferable technical scheme of the utility model, the second device switch comprises a second field effect transistor and a second diode; the second diode is arranged at a connection point between the first device switch and the grounding terminal; the second field effect transistor is arranged at a connection point between the first differential trigger and the first device switch.
As a preferable technical scheme of the utility model, the control circuit further comprises a second differential trigger, and the control unit is in control connection with the second differential trigger.
Compared with the prior art, the utility model has the beneficial effects that:
the control unit controls the high level to be reduced to the low level so as to enable the voltage of the second device switch to be smaller than the starting voltage, and the second device switch at the moment enters a cut-off state, so that the current output by the power supply device cannot be supplied to the operating body through the first device switch, the operating body is stopped, and the operating temperature of the operating body is prevented from being too high, so that the damage condition is caused.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a control circuit diagram of an embodiment of the present utility model.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element.
When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In order to solve the technical problem that a temperature difference hardware detection scheme cannot interrupt a circuit according to the temperature threshold of the running body Product in the prior art, the embodiment of the utility model provides an over-temperature protection control circuit.
The following details a specific scheme of a control circuit for providing over-temperature protection according to an embodiment of the present utility model, which includes a control unit MUC, a switch assembly, and a first differential trigger1 according to the specific scheme shown in fig. 1.
The control unit MUC is in control connection with the temperature sensor 1 via a two-wire bus. Specifically, when the operation body Product enters the operation state, each temperature sensor 1 is started to monitor the operation body Product, and the detection result is fed back to the control unit MUC, so that the operation temperature of the operation body Product is monitored in real time, and the operation temperature of the operation body Product is prevented from being too high, so that the operation body Product is damaged.
Note that, the control unit MUC is MCU (Microcontroller Unit), i.e., a single-chip microcomputer; the two-wire bus is I2C (Inter-Integrated Circuit), i.e., a bidirectional two-wire synchronous serial bus.
The switch assembly comprises a first device switch Q1 and a second device switch Q2, and a plurality of connection points of the first device switch Q1 are respectively and electrically connected with the operating body Product, the power supply device prwer in and the second device switch Q2. Specifically, when the running body Product enters the running state, the power supply device prwer in supplies power to the whole running body Product, and after the second device switch Q2 at the moment enters the on state, a loop is formed at the grounding end of the current provided by the power supply device prwer in through the second device switch Q2, so that the power can be supplied to the whole running body Product.
More specifically, when the voltage of the vg is greater than the on voltage when the current passes through the first device switch Q1, the first device switch Q1 at this time is turned on, the current provided by the power supply device prwer in passes through the first device switch Q1 to supply power to the operating body Product, so that the operating body Product normally operates, each temperature sensor 1 monitors the operating body Product at this time, the control unit MUC receives temperature information obtained by monitoring the temperature sensor 1 through the two-wire bus, and the control unit MUC compares the operating temperature value of the operating body Product with a preset temperature threshold according to a preset software algorithm to determine whether the operating temperature value of the operating body Product exceeds the temperature threshold; if the operating temperature value of the operating body Product exceeds the temperature threshold, the control unit MUC controls the high level to be reduced to the low level, so that the vgs voltage of the second device switch Q2 is smaller than the on voltage, and the second device switch Q2 at this time enters the off state, so that the current provided by the power supply device prwer in cannot supply power to the operating body Product through the first device switch Q1, and the operating body Product stops operating, thereby preventing the operating temperature of the operating body Product from being too high, and causing damage.
It should be noted that, the first device switch Q1 is Q1, that is, a circuit switch; the second device switch Q2 is Q2, i.e. a circuit switch; the vg voltage is the voltage of the gate with respect to the source.
Further, the first differential trigger1 is electrically connected to the second device switch Q2. Specifically, when the control unit MUC controls the high level to decrease to the low level, the control signal needs to be sent through the first differential trigger1, and the first differential trigger1 is used for the triggering device of the voltage event, so that the high level can be decreased to the low level.
Therefore, when the operation temperature value of the operation body Product exceeds the temperature threshold, the embodiment of the utility model timely controls the operation body Product to stop operating, prevents the operation temperature of the operation body Product from being too high, is safe and reliable, prolongs the service life, and avoids the damage condition.
In some embodiments, the control circuit further comprises a first resistor R1 and a second resistor R2; the first resistor R1 is arranged at a connection point between the first device switch Q1 and the second device switch Q2; the second resistor R2 is disposed at a connection point between the power supply device prwer in and the first resistor R1. Specifically, the current provided by the power supply device prwer in needs to pass through the first resistor R1, the second resistor R2 and the second device switch Q2 to form a loop at the ground terminal, and under the action of the first resistor R1 and the second resistor R2, the current passing through the circuit does not exceed the rated value or the specified value required by actual work, so that the normal work of the Product with the running body is ensured, a variable resistor can be generally connected in series in the circuit, and when a plurality of electric appliances with different rated currents are required to be connected to the main circuit of the circuit at the same time, a resistor can be connected in parallel to the two ends of the electric appliance with smaller rated current.
In some embodiments, the second device switch Q2 is electrically connected to ground; the control circuit further comprises a third resistor R3, and the third resistor R3 is arranged at a connection point between the first differential trigger1 and the grounding end. Specifically, the current in the circuit passing through the first differential trigger1 and the grounding terminal does not exceed the rated value or the specified value required by actual operation, so that the normal operation of the operating body Product is ensured.
In a specific embodiment, the control circuit further includes a plurality of capacitors C, where the plurality of capacitors C are disposed at a connection point between the first device switch Q1 and the operating body Product, and the plurality of capacitors C are electrically connected to the ground terminal. The filter function is achieved through the effect of the plurality of capacitors, in the circuit, the voltage and the current output by the power supply device prwer in are more stable by adopting a parallel electrolytic capacitor method, the quality of the whole circuit is effectively improved, each capacitor has the effect of storing energy, and the electrolytic capacitor C with large enough capacity effectively improves the low-frequency impedance of a power supply, so that the instantaneous dynamic quality can be improved.
It is understood that 5 capacitors C are provided, and 5 capacitors C are juxtaposed.
In a specific embodiment, the first device switch Q1 includes a zener diode ZD, a first diode D1, and a first field effect transistor MOS1; the zener diode ZD is arranged at a connection point between the second device switch Q2 and the power supply device prwer in; the first diode D1 is arranged at a connection point between the power supply device prwer in and the operating body Product; the first field effect transistor MOS1 is disposed at a connection point between the power supply device prwer in and the operating body Product. Specifically, the first field effect transistor MOS1 is used as an electronic switch, and functions to turn on or off a circuit in a circuit, thereby realizing control of the circuit. For example, in the management circuit between the power supply device prwer in and the operating body Product, the first fet MOS1 may be used as a switch to control on/off of the circuit; the first field effect transistor MOS1 may also be used to fabricate a clock circuit, so as to process an input signal, and generate and count a clock signal.
At the critical breakdown point, the reverse resistance decreases to a small value, the current in the low resistance region increases, and the voltage remains constant.
In a specific embodiment, the second device switch Q2 includes a second field effect transistor MOS2 and a second diode D2; the second diode D2 is disposed at a connection point between the first device switch Q1 and the ground terminal; the second field effect transistor MOS2 is disposed at a connection point between the first differential trigger1 and the first device switch Q1. Specifically, the second field effect transistor MOS2 is used as an electronic switch, and functions to turn on or off a circuit in the circuit, thereby realizing control of the circuit.
In a specific embodiment, the control circuit further includes a second differential trigger, and the control unit MUC is in control connection with the second differential trigger. In particular, the second differential flip-flop is also used for the triggering means of the voltage event, and is therefore able to reduce the high level to the low level.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (7)
1. A control circuit for over-temperature protection, the control circuit comprising:
the control unit is in control connection with the temperature sensor through a two-wire bus;
the switch assembly comprises a first device switch and a second device switch, and a plurality of connection points of the first device switch are respectively and electrically connected with the operation body, the power supply device and the second device switch;
and the first difference trigger is electrically connected with the second device switch.
2. The over-temperature protection control circuit of claim 1, further comprising a first resistor and a second resistor;
the first resistor is arranged at a connection point between the first device switch and the second device switch;
the second resistor is arranged at a connection point between the power supply device and the first resistor.
3. The over-temperature protection control circuit of claim 1, wherein the second device switch is electrically connected to ground;
the control circuit further comprises a third resistor arranged at a connection point between the first differential trigger and the grounding terminal.
4. The over-temperature protection control circuit according to claim 1, further comprising a plurality of capacitors, each of the plurality of capacitors being disposed at a connection point between the first device switch and the operating body;
a plurality of the capacitors are electrically connected to ground.
5. The over-temperature protection control circuit according to any one of claims 1 to 4, wherein the first device switch comprises a zener diode, a first diode, and a first field effect transistor; the voltage stabilizing diode is arranged at a connection point between the second device switch and the power supply device; the first diode is arranged at a connection point between the power supply device and the operation body; the first field effect transistor is arranged at a connection point between the power supply device and the operation body.
6. An over-temperature protected control circuit according to any of claims 1-4, wherein said second device switch comprises a second field effect transistor and a second diode; the second diode is arranged at a connection point between the first device switch and the grounding terminal; the second field effect transistor is arranged at a connection point between the first differential trigger and the first device switch.
7. The over-temperature protection control circuit according to claim 1, further comprising a second differential trigger, wherein the control unit is in control connection with the second differential trigger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321682818.7U CN220139226U (en) | 2023-06-29 | 2023-06-29 | Control circuit for over-temperature protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321682818.7U CN220139226U (en) | 2023-06-29 | 2023-06-29 | Control circuit for over-temperature protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220139226U true CN220139226U (en) | 2023-12-05 |
Family
ID=88948868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321682818.7U Active CN220139226U (en) | 2023-06-29 | 2023-06-29 | Control circuit for over-temperature protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220139226U (en) |
-
2023
- 2023-06-29 CN CN202321682818.7U patent/CN220139226U/en active Active
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