CN209592970U - A kind of thermal-shutdown circuit - Google Patents
A kind of thermal-shutdown circuit Download PDFInfo
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- CN209592970U CN209592970U CN201920266273.9U CN201920266273U CN209592970U CN 209592970 U CN209592970 U CN 209592970U CN 201920266273 U CN201920266273 U CN 201920266273U CN 209592970 U CN209592970 U CN 209592970U
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Abstract
The utility model relates to electronic technology fields, provide a kind of thermal-shutdown circuit, the thermal-shutdown circuit includes power supply, temperature detect switch (TDS) open in usual and first switch unit, when Current Temperatures are greater than or equal to preset temperature threshold, the common of temperature detect switch (TDS) open in usual is contacted with normally opened contact, temperature detect switch (TDS) open in usual transmits shutdown control signal to first switch unit, first switch unit disconnects the circuit of controlled circuit according to shutdown control signal, compared to the thermal-shutdown circuit only with single normally closed type temperature detect switch (TDS), temperature detect switch (TDS) open in usual in above-mentioned thermal-shutdown circuit is just closed in the case of a high temperature, because of the case where contact adhesion of temperature detect switch (TDS) under high-temperature condition may be not present, so that thermal-shutdown circuit can normally realize the function of disconnecting the circuit of controlled circuit in the case of a high temperature, efficiently solve existing overheat protector Circuit vulnerable problem in the case of a high temperature.
Description
Technical field
The utility model belongs to electronic technology field more particularly to a kind of thermal-shutdown circuit.
Background technique
Temperature detect switch (TDS) refers to the temperature change according to working environment, physical deformation occurs in switch internal, to generate conducting
Or a series of Automatic Control Components of disconnection movement, it is widely used in the main circuit circuit of household electrical appliance, realizes high
The function in main circuit circuit is disconnected in warm situation.Specifically, the prior art is connected one usually in the main circuit of household electrical appliance
Normally closed type temperature detect switch (TDS) is as thermal-shutdown circuit, and the normally closed type temperature detect switch (TDS) is when the temperature of working environment is lower than set temperature
In closed state, off-state is switched to from closed state when the temperature of working environment is greater than or equal to preset temperature, into
And disconnect main circuit circuit.
However, due to high-temperature condition flowed down temperature detect switch (TDS) electric current it is larger, and the current capacity of the contact of temperature detect switch (TDS)
It is usually smaller, thus often there is a situation where contact adhesion, cause temperature detect switch (TDS) under high-temperature condition that can not switch to disconnection shape
State, to cannot achieve the function of disconnecting main circuit circuit under high-temperature condition.
In summary, the normally closed type temperature detect switch (TDS) as used by existing thermal-shutdown circuit easily touches at high temperature
Point adhesion the case where, thus existing thermal-shutdown circuit there is a problem of it is vulnerable at high temperature.
Utility model content
In view of this, the utility model embodiment provides a kind of thermal-shutdown circuit, it is intended to solve existing excess temperature and protect
Protection circuit vulnerable problem in the case of a high temperature.
The utility model embodiment provides a kind of thermal-shutdown circuit, including power supply, temperature detect switch (TDS) open in usual and
One switch unit；
The positive output end of the power supply is connect with the positive power source terminal of the first switch unit, the negative output terminal of the power supply
It is connect with the common of the temperature detect switch (TDS) open in usual, the normally-closed contact of the temperature detect switch (TDS) open in usual is hanging, described normally opened
The normally opened contact of formula temperature detect switch (TDS) is connect with the negative power end of the first switch unit, the first control of the first switch unit
End processed and the second control terminal are connect with the first end and second end of controlled circuit respectively；
Current Temperatures be greater than or equal to preset temperature threshold when, the common of the temperature detect switch (TDS) open in usual with
Normally opened contact contact, the temperature detect switch (TDS) open in usual transmit shutdown control signal to the first switch unit, and described the
One switch unit disconnects the circuit of the controlled circuit according to the shutdown control signal.
Further, the first switch unit includes relay and first capacitor；
The first end of the control coil of the relay is the positive power source terminal of the first switch unit, the relay
The second end of control coil is connect with the first end of the first capacitor, and the second end of the first capacitor is the first switch
The negative power end of unit, the normally-closed contact of the relay are the first control terminal of the first switch unit, the relay
Common be the first switch unit the second control terminal, the normally opened contact of the relay is hanging；
Current Temperatures be greater than or equal to preset temperature threshold when, the common of the temperature detect switch (TDS) open in usual with
The normally opened contact contact, the temperature detect switch (TDS) open in usual transmits low level signal to the second end of the first capacitor, described
The common of relay is contacted with the normally opened contact, to disconnect the circuit of the controlled circuit.
Further, the relay is magnetic latching relay.
Further, after the common of the relay is contacted with the normally opened contact, if Current Temperatures are small
In the preset temperature threshold, then the common of the relay and the normally opened contact are kept in contact state.
Further, further includes: the control unit being connect with the relay；
After the common of the relay is contacted with the normally opened contact, if described control unit receive it is pre-
If control instruction, then the common for controlling the relay is contacted with the normally-closed contact.
Further, the first capacitor is ceramic disc capacitor or monolithic capacitor.
Above-mentioned thermal-shutdown circuit, by using power supply, temperature detect switch (TDS) open in usual and first switch unit, in current temperature
When degree is greater than or equal to preset temperature threshold, the common of temperature detect switch (TDS) open in usual is contacted with normally opened contact, temperature control open in usual
It switchs to first switch unit and transmits shutdown control signal, first switch unit disconnects controlled circuit according to shutdown control signal
Circuit, it is open in usual in above-mentioned thermal-shutdown circuit compared to the thermal-shutdown circuit only with single normally closed type temperature detect switch (TDS)
Temperature detect switch (TDS) is just closed in the case of a high temperature, because of the case where contact adhesion of temperature detect switch (TDS) under high-temperature condition may be not present, so that
Thermal-shutdown circuit can normally realize the function of disconnecting the circuit of controlled circuit in the case of a high temperature, efficiently solve existing
Thermal-shutdown circuit vulnerable problem in the case of a high temperature.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of thermal-shutdown circuit provided by the embodiment of the utility model；
Fig. 2 is a kind of circuit theory schematic diagram of thermal-shutdown circuit provided by the embodiment of the utility model；
Fig. 3 is a kind of circuit theory schematic diagram for thermal-shutdown circuit that another embodiment of the utility model provides.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
It should be noted that term " includes " in the specification and claims of the utility model and they are any
Deformation, it is intended that cover and non-exclusive include.Such as system, product or the equipment comprising a series of units are not limited to
The unit listed, but optionally further comprising the step of not listing or unit, or optionally further comprising for these products or
The intrinsic other units of equipment.In addition, term " first ", " second " and " third " etc. are for distinguishing different objects, Er Feiyong
In description particular order.
The utility model embodiment is vulnerable in the case of a high temperature in order to solve the problems, such as existing thermal-shutdown circuit, mentions
A kind of thermal-shutdown circuit has been supplied, by using power supply, temperature detect switch (TDS) open in usual and first switch unit, has been greater than in Current Temperatures
Or be equal to preset temperature threshold when, the common of temperature detect switch (TDS) open in usual is contacted with normally opened contact, temperature detect switch (TDS) open in usual to
First switch unit transmitting shutdown control signal, first switch unit disconnect the circuit of controlled circuit according to shutdown control signal,
Compared to the thermal-shutdown circuit only with single normally closed type temperature detect switch (TDS), the temperature control open in usual in above-mentioned thermal-shutdown circuit is opened
Pass is just closed in the case of a high temperature, because of the case where contact adhesion of temperature detect switch (TDS) under high-temperature condition may be not present, so that excess temperature is protected
Protection circuit can normally realize the function of disconnecting the circuit of controlled circuit in the case of a high temperature, efficiently solve existing excess temperature and protect
Protection circuit vulnerable problem in the case of a high temperature.
In order to illustrate above-mentioned thermal-shutdown circuit, it is described in detail below in conjunction with specific embodiment:
Fig. 1 is a kind of structural schematic diagram of thermal-shutdown circuit provided by the embodiment of the utility model, for ease of description,
Part relevant to the utility model embodiment is illustrated only, details are as follows:
Referring to Fig. 1, a kind of thermal-shutdown circuit 100 provided by the embodiment of the utility model, including it is power supply 11, open in usual
Temperature detect switch (TDS) SW1 and first switch unit 12.
The positive output end of power supply 11 is connect with 11 end of positive supply of first switch unit 12, the negative output terminal of power supply 11 and often
The common a1 connection of open type temperature detect switch (TDS) SW1, the normally-closed contact a2 of temperature detect switch (TDS) SW1 open in usual is hanging, temperature control open in usual
The normally opened contact a3 of switch SW1 is connect with 11 end of negative supply of first switch unit 12, the first control of first switch unit 12
End and the second control terminal are connect with the first end and second end of controlled circuit 200 respectively.
Current Temperatures be greater than or equal to preset temperature threshold when, the common a1 of temperature detect switch (TDS) SW1 open in usual and often
Contact a3 contact is opened, temperature detect switch (TDS) SW1 open in usual transmits shutdown control signal, first switch unit 12 to first switch unit 12
The circuit of controlled circuit 200 is disconnected according to shutdown control signal.
It should be noted that Current Temperatures refer to building ring locating for thermal-shutdown circuit 100 in the utility model embodiment
The Current Temperatures in border.Preset temperature threshold is used to characterize the critical temperature value of triggering overheat protector movement, and preset temperature threshold can
It is arranged according to actual needs, herein with no restrictions.
When the common a1 and normally-closed contact a2 of temperature detect switch (TDS) SW1 open in usual are contacted, temperature detect switch (TDS) SW1 open in usual is in
Off-state；When the common a1 and normally opened contact a3 of temperature detect switch (TDS) SW1 open in usual are contacted, at temperature detect switch (TDS) SW1 open in usual
In closed state.
When Current Temperatures are less than preset temperature threshold, the common a1 and normally-closed contact of temperature detect switch (TDS) SW1 open in usual
A2 contact, temperature detect switch (TDS) SW1 open in usual is in an off state, at this point, the circuit of controlled circuit 200 is in the conductive state.It can be with
Understand, in practical applications, when Current Temperatures are less than preset temperature threshold, can be controlled by setting control unit
The conducting and shutdown in the circuit of controlled circuit 200, and temperature detect switch (TDS) SW1 open in usual is only greater than or equal to default temperature in Current Temperatures
When spending threshold value, the circuit that first switch unit 12 disconnects controlled circuit 200 is just controlled.
In practical applications, controlled circuit 200 can be the main circuit in any electronic equipment.
As shown in Fig. 2, first switch unit 12 includes the electricity of relay SW2 and first as an embodiment of the present invention
Hold C1.
The first end of the control coil of relay SW2 is 11 end of positive supply of first switch unit 12, the control of relay SW2
The second end of coil processed is connect with the first end of first capacitor C1, and the second end of first capacitor C1 is the negative of first switch unit 12
11 end of power supply, the normally-closed contact b2 of relay SW2 are the first control terminal of first switch unit 12, the public touching of relay SW2
Point b1 is the second control terminal of first switch unit 12, and the normally opened contact b3 of relay SW2 is hanging.
Current Temperatures be greater than or equal to preset temperature threshold when, the common a1 of temperature detect switch (TDS) SW1 open in usual and often
Contact a3 contact is opened, temperature detect switch (TDS) SW1 open in usual transmits low level signal to the second end of first capacitor C1, relay SW2's
Common b1 is contacted with normally opened contact b3, to disconnect the circuit of controlled circuit 200.
It should be noted that shutdown control signal is specially low level signal in the present embodiment.
When the common b1 and normally-closed contact b2 of relay SW2 are contacted, relay SW2 is in closed state；Relay
When the common b1 and normally opened contact b3 of SW2 are contacted, relay SW2 is in an off state.
As an embodiment of the present invention, relay SW2 is magnetic latching relay.
In the present embodiment, due to relay SW2 be magnetic latching relay, relay SW2 common b1 with
After normally opened contact b3 contact, if Current Temperatures drop to Current Temperatures less than preset temperature threshold, the public touching of relay SW2
Point b1 and normally opened contact b3 are kept in contact state, to will not cause the change repeatedly of the temperature of electronic equipment where controlled circuit
Change, avoids security risk.
In practical applications, it after the common b1 of relay SW2 is contacted with normally opened contact b3, needs by relay
The control coil of SW2 adds backward voltage, or by software control, just relay SW2 can be made to be again at closed state.
As shown in figure 3, as an embodiment of the present invention, thermal-shutdown circuit 100 further include: connect with relay SW2
The control unit 13 connect.
After the common b1 of relay SW2 is contacted with normally opened contact b3, if control unit 13 receives default control
Instruction, then the common b1 for controlling relay SW2 are contacted with normally-closed contact b2.
In the present embodiment, after common b1 and normally opened contact the b3 contact of relay SW2, if desired make relay
SW2 is again at closed state, and then the circuit of controlled circuit 200 is connected, then can send default control to control unit 13
Instruction.After control unit 13 receives control instruction, the common b1 of control relay SW2 is contacted with normally-closed contact b2, into
And it is closed relay SW2, the circuit of controlled circuit 200 is connected.
In one embodiment, above-mentioned first capacitor C1 is ceramic disc capacitor or monolithic capacitor.
Since the leakage current of ceramic disc capacitor and monolithic capacitor is smaller, thus after first capacitor C1 is full of point, first is flowed through
The electric current of capacitor C1 is smaller, to reduce the influence for carrying out excess temperature control to thermal-shutdown circuit.
It is described further below in conjunction with working principle of the Fig. 3 to above-mentioned thermal-shutdown circuit:
As shown in figure 3, when Current Temperatures are less than preset temperature threshold, the common a1 of temperature detect switch (TDS) SW1 open in usual
It is contacted with normally-closed contact a2, at this point, temperature detect switch (TDS) SW1 open in usual is in an off state, the both ends of first capacitor C1 are deposited without charge
, the control coil both ends potential-free of relay SW2 is poor, and no current flows through in the control coil of relay SW2, thus, relay
The common b1 of device SW2 is contacted with normally-closed contact b2, and relay SW2 is in closed state, and the circuit of controlled circuit 200 is in
On state.
When Current Temperatures are greater than or equal to preset temperature threshold, shape occurs for the contact elastic slice of temperature detect switch (TDS) SW1 open in usual
Become, so that the common a1 of temperature detect switch (TDS) SW1 open in usual is contacted with normally opened contact a3, so that temperature detect switch (TDS) open in usual
SW1 is in the conductive state, at this point, power supply 11 starts to charge to first capacitor C1, the control coil both ends of relay SW2 have electricity
Potential difference has electric current to flow through in the control coil of relay SW2, so that the common b1 and normally opened contact of relay SW2
B3 contact, relay SW2 is in an off state, to disconnect the circuit of controlled circuit 200, realizes overheat protector function.
When Current Temperatures deteriorate to less than preset temperature threshold, the common a1 of temperature detect switch (TDS) SW1 open in usual and often
Closed contact a2 contact, at this point, temperature detect switch (TDS) SW1 open in usual is in an off state, the both ends of first capacitor C1 exist without charge, but
Since relay SW2 is magnetic latching relay, the common b1 and normally opened contact b3 of relay SW2 can also be kept in contact shape
State makes the common b1 and normally-closed contact b2 of relay SW2 at this time, it may be necessary to remove control relay SW2 by control unit 13
Contact, and then it is closed relay SW2, the circuit of controlled circuit 200 is connected.
Thermal-shutdown circuit provided in this embodiment, by using power supply, temperature detect switch (TDS) open in usual and first switch unit,
When Current Temperatures are greater than or equal to preset temperature threshold, the common of temperature detect switch (TDS) open in usual is contacted with normally opened contact, often
Open type temperature detect switch (TDS) to first switch unit transmit shutdown control signal, first switch unit according to shutdown control signal disconnect by
The circuit for controlling circuit, compared to the thermal-shutdown circuit only with single normally closed type temperature detect switch (TDS), in above-mentioned thermal-shutdown circuit
Temperature detect switch (TDS) open in usual be just closed in the case of a high temperature, because the feelings of the contact adhesion of temperature detect switch (TDS) under high-temperature condition may be not present
Condition efficiently solves so that thermal-shutdown circuit can normally realize the function of disconnecting the circuit of controlled circuit in the case of a high temperature
Existing thermal-shutdown circuit vulnerable problem in the case of a high temperature.Simultaneously as in the non-action of thermal-shutdown circuit
Period, no current flows through in entire thermal-shutdown circuit, thus power consumption of the temperature protection circuit during non-action is 0, is reduced
The power consumption of temperature protection circuit.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the utility model within novel spirit and principle
Within the scope of shield.
Claims (6)
1. a kind of thermal-shutdown circuit, which is characterized in that including power supply, temperature detect switch (TDS) open in usual and first switch unit；
The positive output end of the power supply is connect with the positive power source terminal of the first switch unit, the negative output terminal of the power supply and institute
The common connection of temperature detect switch (TDS) open in usual is stated, the normally-closed contact of the temperature detect switch (TDS) open in usual is hanging, the temperature open in usual
The normally opened contact of control switch is connect with the negative power end of the first switch unit, the first control terminal of the first switch unit
It is connect respectively with the first end and second end of controlled circuit with the second control terminal；
Current Temperatures be greater than or equal to preset temperature threshold when, the common of the temperature detect switch (TDS) open in usual with it is described
Normally opened contact contact, the temperature detect switch (TDS) open in usual transmit shutdown control signal to the first switch unit, and described first opens
Close the circuit that unit disconnects the controlled circuit according to the shutdown control signal.
2. thermal-shutdown circuit according to claim 1, which is characterized in that the first switch unit include relay and
First capacitor；
The first end of the control coil of the relay is the positive power source terminal of the first switch unit, the control of the relay
The second end of coil is connect with the first end of the first capacitor, and the second end of the first capacitor is the first switch unit
Negative power end, the normally-closed contact of the relay is the first control terminal of the first switch unit, the public affairs of the relay
Contact is the second control terminal of the first switch unit altogether, and the normally opened contact of the relay is hanging；
Current Temperatures be greater than or equal to preset temperature threshold when, the common of the temperature detect switch (TDS) open in usual with it is described
Normally opened contact contact, the temperature detect switch (TDS) open in usual transmit low level signal, the relay to the second end of the first capacitor
The common of device is contacted with the normally opened contact, to disconnect the circuit of the controlled circuit.
3. thermal-shutdown circuit according to claim 2, which is characterized in that the relay is magnetic latching relay.
4. thermal-shutdown circuit according to claim 3, which is characterized in that the relay the common with
After the normally opened contact contact, if Current Temperatures are less than the preset temperature threshold, the common of the relay
State is kept in contact with the normally opened contact.
5. thermal-shutdown circuit according to claim 3, which is characterized in that further include: the control being connect with the relay
Unit processed；
After the common of the relay is contacted with the normally opened contact, if described control unit receives default control
System instruction, the then common for controlling the relay are contacted with the normally-closed contact.
6. thermal-shutdown circuit according to claim 2, which is characterized in that the first capacitor is ceramic disc capacitor or only stone
Capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920266273.9U CN209592970U (en) | 2019-03-01 | 2019-03-01 | A kind of thermal-shutdown circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920266273.9U CN209592970U (en) | 2019-03-01 | 2019-03-01 | A kind of thermal-shutdown circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209592970U true CN209592970U (en) | 2019-11-05 |
Family
ID=68371386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920266273.9U Active CN209592970U (en) | 2019-03-01 | 2019-03-01 | A kind of thermal-shutdown circuit |
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| Country | Link |
|---|---|
| CN (1) | CN209592970U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980606A (en) * | 2019-03-01 | 2019-07-05 | 常州猛犸电动科技有限公司 | A kind of thermal-shutdown circuit |
-
2019
- 2019-03-01 CN CN201920266273.9U patent/CN209592970U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980606A (en) * | 2019-03-01 | 2019-07-05 | 常州猛犸电动科技有限公司 | A kind of thermal-shutdown circuit |
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Effective date of registration: 20211027 Address after: 337000 Building 5 and 7, artificial intelligence Industrial Park, Anyuan Industrial Park, Anyuan District, Pingxiang City, Jiangxi Province Patentee after: Jiangxi mammoth Energy Co.,Ltd. Address before: No. 31, Fengxiang Road, Wujin national high tech Industrial Development Zone, Changzhou City, Jiangsu Province 213100 Patentee before: CHANGZHOU MENGMA ELECTRIC TECHNOLOGY Co.,Ltd. |