CN210074762U - Temperature control circuit - Google Patents
Temperature control circuit Download PDFInfo
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- CN210074762U CN210074762U CN201920793252.2U CN201920793252U CN210074762U CN 210074762 U CN210074762 U CN 210074762U CN 201920793252 U CN201920793252 U CN 201920793252U CN 210074762 U CN210074762 U CN 210074762U
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Abstract
The utility model discloses a temperature control circuit has the resistance of temperature coefficient through the setting, through gain control temperature detecting element according to the operating temperature of the electronic component who acquires and the contrast of detection threshold value, confirms whether close corresponding switch, and then can be when ambient temperature changes, temperature control resistance is introduced to the resistance that control has the temperature coefficient, makes like this that the electronic component can all give maximum output under the ambient temperature that can be different, does not receive application environment temperature's restriction.
Description
Technical Field
The utility model relates to a temperature control technical field, concretely relates to temperature control circuit.
Background
Among the prior art, can set up the overtemperature protection function to the load, have two parameters of protection temperature and recovery temperature, after the temperature is higher than protection temperature, close the load, the load is closed the back, and no longer the dissipated power, the temperature of load begins to reduce, after the temperature reduces to recovery temperature, the load begins work again, and this kind of temperature protection has the limitation.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a temperature control circuit for solve the technical problem who exists now.
In order to achieve the above object, an embodiment of the present invention provides a temperature control circuit, including: the device comprises a first temperature control branch, a second temperature control branch and a gain control unit;
the first temperature control branch comprises a first resistor and a third resistor, and the first resistor and the third resistor are arranged in series;
the second temperature control branch comprises a second resistor;
one end of the third resistor, which is far away from the first resistor, is connected with the second resistor, a common end of the third resistor and the second resistor is connected with an input end of an electronic element, and one end of the second resistor, which is far away from the third resistor, is connected with an output end of the electronic element;
the gain control unit is connected with the common end of the first resistor and the third resistor through a first switch, and the gain control unit controls whether the third resistor is introduced into the temperature control circuit or not by controlling the opening or closing of the first switch.
Preferably, the third resistor is a positive temperature coefficient resistor.
Preferably, the temperature control circuit further comprises a fourth resistor, one end of the fourth resistor is connected with one end, far away from the third resistor, of the second resistor, the other end of the fourth resistor is connected with the output end of the electronic element, the gain control unit is connected with the common end of the first resistor and the third resistor through a first switch, the gain control unit is connected with the common end of the second resistor and the fourth resistor through a second switch, and the gain control unit controls whether the third resistor and the fourth resistor are introduced into the temperature control circuit or not by controlling the opening or closing of the first switch and the second switch.
Preferably, the fourth resistance is a negative temperature coefficient resistance.
Preferably, when the first switch and the second switch are closed, the gain of the electronic element is: x1 ═ R21/R11, R21 is the resistance of the second resistor, and R11 is the resistance of the first resistor;
when the first switch and the second switch are turned off, the gain of the electronic element is: x2 is (R21+ R22)/(R11+ R12), R21 is the resistance of the second resistance, R22 is the resistance of the fourth resistance, R11 is the resistance of the first resistance, and R12 is the resistance of the third resistance.
Preferably, a ratio of the resistance of the first resistance to the second resistance is equal to a ratio of the third resistance to the fourth resistance.
Preferably, the electronic device further comprises an over-temperature protection temperature detection unit, wherein the over-temperature protection temperature detection unit is used for detecting the working temperature of the electronic element, comparing the working temperature of the electronic element with the protection threshold value of the over-temperature protection temperature detection unit, and if the working temperature of the electronic element exceeds the protection threshold value of the over-temperature protection temperature detection unit, closing the electronic element.
Preferably, the protection threshold of the over-temperature protection temperature detection unit is greater than the detection threshold of the gain control unit.
Preferably, the electronic component is a power amplifier.
In addition, the embodiment of the utility model provides a temperature control circuit is still provided, include: the device comprises a first temperature control branch, a second temperature control branch and a gain control unit;
the first temperature control branch comprises a first resistor,
the second temperature control branch comprises a second resistor and a fourth resistor, and the second resistor and the fourth resistor are arranged in series;
one end of the fourth resistor is connected with the second resistor, and one end of the fourth resistor, which is far away from the second resistor, is connected with an output end of the electronic element;
the gain control unit is connected with the common end of the second resistor and the fourth resistor through a second switch, and the gain control unit controls whether the fourth resistor is introduced into the temperature control circuit or not by controlling the opening or closing of the second switch.
Preferably, the fourth resistance is a negative temperature coefficient resistance.
In addition, the embodiment of the utility model provides a temperature control method is still provided, include:
comparing the acquired temperature of the electronic element with a detection threshold value of the gain control unit;
if the acquired working temperature of the electronic element is less than the detection threshold value of the gain control unit, controlling the first switch and/or the second switch to be closed; and if the acquired temperature of the electronic element is not less than the detection threshold value of the gain control temperature detection unit, controlling the first switch and the second switch to be opened, and introducing a third resistor and/or a fourth resistor to control the gain of the electronic element.
Preferably, the third resistor is a positive temperature coefficient resistor, and the fourth resistor is a negative temperature coefficient resistor.
Preferably, a first switch and a second switch are arranged in the temperature control circuit, and when the first switch and the second switch are closed, the gain of the electronic element is as follows: x1 ═ R21/R11, R21 is the resistance of the second resistor, and R11 is the resistance of the first resistor;
when the first switch and the second switch are turned off, the gain of the electronic element is: x2 is (R21+ R22)/(R11+ R12), R21 is the resistance of the third resistance, R22 is the fourth resistance, R11 is the resistance of the first resistance, and R12 is the resistance of the second resistance.
Preferably, a ratio of the resistance of the first resistance to the second resistance is equal to a ratio of the third resistance to the fourth resistance.
The embodiment of the utility model provides a pair of temperature control circuit and method, through setting up the resistance that has the temperature coefficient, through gain control temperature detecting element according to the operating temperature of the electronic component who acquires and the contrast of detection threshold value, confirm whether close corresponding switch, and then can be when ambient temperature changes, the control has the resistance of temperature coefficient to introduce temperature control resistance, makes like this that the electronic component can all give maximum output under the ambient temperature that can be different, does not receive the restriction of applied environment temperature.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a temperature control circuit according to the prior art;
fig. 2 is a schematic flow chart of a temperature control circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a temperature control circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a temperature control circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of a temperature control method according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, fig. 1 is a schematic diagram of a temperature control method in the prior art.
The electronic component may be a power amplifier, but the prior art solution does not introduce a temperature coefficient resistor, so that the gain of the power amplifier cannot be controlled.
The disadvantage of this method is that when the power amplifier enters into an over-temperature state, it appears as abnormal operation, and the sound will be interrupted continuously, so that normal listening is not possible. In addition, the working state of the power amplifier is greatly affected by the working environment, for example, at room temperature of 25 ℃, the power amplifier can drive 50W of output power, the power amplifier dissipates 5W of power, and at this time, there is no over-temperature, if the room temperature is increased or the power amplifier works at a high temperature, for example, the temperature of the working environment is 85 ℃, at this time, the power amplifier may have over-temperature protection, in order to prevent the over-temperature protection from occurring under the normal working condition of the power amplifier, the worst working environment must be considered, the output power is limited, for example, the power amplifier with the highest environmental temperature of 85 ℃ is considered, at this time, only 30W of output power can be driven, and even if the environmental temperature is reduced, there is no way.
Example 1
As shown in fig. 2, fig. 2 is a schematic flow chart of a temperature control circuit according to an embodiment of the present disclosure, and the electronic component in this embodiment is a power amplifier.
The embodiment of the utility model provides a pair of temperature control circuit, include: a first resistor R11, a second resistor R21, a third resistor R12, and a gain control unit, wherein one end of the third resistor R12, which is far from the first resistor R11, is connected to the second resistor R21, a common end of the third resistor R12 and the second resistor R21 is connected to an input end of an electronic device, and one end of the second resistor R21, which is far from the third resistor R12, is connected to an output end of the electronic device;
the gain control unit is connected to a common terminal of the first resistor R11 and the third resistor R12 through a first switch S1, and the gain control unit controls whether the third resistor R12 is introduced into the temperature control circuit by controlling the opening or closing of the first switch S1.
The gain control unit compares the working temperature of the electronic element with the detection threshold of the gain control unit according to the detected working temperature of the electronic element, if the working temperature of the electronic element is less than the detection threshold of the gain control unit, the first switch S1 is closed and the gain control unit is opened, in short, under the normal condition, as long as the working temperature of the electronic element is less than the detection threshold of the gain control unit and the detection threshold of the gain control unit is preset, the first switch S1 is closed and the gain control unit is opened, the third resistor R12 is short-circuited and is not introduced into the temperature control circuit, and therefore, the gain of the electronic element cannot be acted; if the operating temperature of the electronic device is not less than the operating temperature of the electronic device, the gain control unit will control the first switch S1 to disconnect from the gain control unit, the third resistor R12 is introduced into the temperature control circuit, and the third resistor R12 will act on the gain of the electronic device.
In the embodiment of the present invention, the third resistor is a resistor with a temperature coefficient, specifically a positive temperature coefficient resistor, and in some embodiments, the third resistor can also be a negative temperature coefficient resistor, which is not limited thereto.
The embodiment of the utility model provides a, still include excess temperature protection temperature detecting element, above-mentioned excess temperature protection temperature detecting element is used for detecting above-mentioned electronic component's operating temperature to compare above-mentioned electronic component's operating temperature and above-mentioned excess temperature protection temperature detecting element's protection threshold value, if exceed above-mentioned excess temperature protection temperature detecting element's protection threshold value, close electronic component.
In the above case, when the ambient temperature is too high, abnormal applications such as short circuit cannot reduce the temperature by reducing the gain, and it is necessary to compare the operating temperature of the load with the protection threshold of the over-temperature protection temperature detection unit, and if the operating temperature exceeds the protection threshold of the over-temperature protection temperature detection unit, the electronic component is turned off.
The utility model discloses an in the embodiment, above-mentioned excess temperature protection temperature detecting element's protection threshold value is greater than above-mentioned gain control temperature detecting element's detection threshold value, and the purpose that sets up like this is mainly in order to carry out duplicate protection to electronic component, and gain that can control electronic component through preferential mode changes, then controls in the mode through closing electronic component, so above-mentioned gain control temperature detecting element's detection threshold value can not be greater than excess temperature protection temperature detecting element's protection threshold value.
In the embodiment of the present invention, when the first switch S1 is closed, the gain of the electronic component is: x1 ═ R21/R11, where R21 is the resistance of the second resistor and R11 is the resistance of the first resistor;
when the first switch S1 is turned off, the gain of the electronic component is: x2 ═ R21/(R11+ R12), R21 is the resistance of the second resistance, R11 is the resistance of the first resistance, and R12 is the resistance of the third resistance.
The magnification of the electronic component is:
Y＝{R21[(T-25)]}/{R11+R12[(1+k12)(T-25)]}
r21 is a resistance of the second resistor, T is an operating temperature of the electronic component, R11 is a resistance of the first resistor, R12 is a resistance of the third resistor, K12 is a temperature coefficient of the third resistor, and 25 is a temperature of room temperature.
The temperature control circuit is provided with a temperature coefficient resistor, and whether the temperature coefficient resistor is introduced or not can be controlled by controlling the working temperature of the electronic element detected by the temperature detection unit through the gain.
The utility model discloses an in the embodiment, R11 and R21 temperature coefficient are less or no temperature coefficient.
Example 2
As shown in fig. 3, fig. 3 is a schematic flow chart of a temperature control circuit according to an embodiment of the present disclosure, and the load in this embodiment is a power amplifier.
In an embodiment of the present invention, the temperature control circuit further includes a fourth resistor, one end of the fourth resistor R22 is connected to one end of the second resistor R21 far from the third resistor R12, the other end of the fourth resistor R22 is connected to the output end of the electronic component, the gain control unit is connected to the common end of the first resistor R11 and the third resistor R12 through a first switch S1, the gain control unit is connected to the common end of the second resistor R21 and the fourth resistor R22 through a second switch S2, and the gain control unit controls the opening or closing of the first switch S1 and the second switch S2 to further control whether the third resistor R12 and the fourth resistor R22 are introduced into the temperature control circuit.
The present embodiment controls the gain of the electronic component by introducing two resistors with temperature coefficients.
In the embodiment of the present disclosure, when the first switch S1 and the second switch S2 are closed, the gain of the electronic component is: x1 ═ R21/R11, where R21 is the resistance of the second resistor and R11 is the resistance of the first resistor;
when the first switch S1 and the second switch S2 are turned off, the gain of the electronic component is: x2 is (R21+ R22)/(R11+ R12), R21 is the resistance of the second resistance, R22 is the resistance of the fourth resistance, R11 is the resistance of the first resistance, and R12 is the resistance of the third resistance.
Preferably, a ratio of the resistance of the first resistor to the second resistor is equal to a ratio of the third resistor to the fourth resistor.
When the switch is turned off, the amplification factor of the electronic element is as follows:
Y＝{R21+R22[(1-k22)(T-25)]}/{R11+R12[(1+k12)(T-25)]}
the above-mentioned R21 is a resistance of the second resistor, T is an operating temperature of the load, R11 is a resistance of the first resistor, R12 is a resistance of the third resistor, K12 is a temperature coefficient of the third resistor, R22 is a resistance of the fourth resistor, K22 is a temperature coefficient of the fourth resistor, and 25 is a temperature of room temperature.
Under normal conditions, as long as the working temperature of the electronic element is less than the detection threshold of the gain control unit, the detection threshold of the gain control unit is preset, the first switch S1 and the second switch S2 are closed and disconnected with the gain control unit, and the short circuit of the third resistor R12 and the fourth resistor R22 does not introduce a temperature control circuit, so that the electronic element is not acted; if the operating temperature of the electronic component is not less than the detection threshold of the gain control unit, the gain control unit controls the first switch S1 and the second switch S2 to be disconnected from the gain control unit, the third resistor R12 and the fourth resistor R22 are incorporated into the temperature control circuit, and the third resistor R12 and the fourth resistor R22 act on the gain of the electronic component.
In an embodiment of the present invention, the third resistor R12 is a positive temperature coefficient resistor, and the fourth resistor R22 is a negative temperature coefficient resistor; or the third resistor R12 is a negative temperature coefficient resistor, and the fourth resistor R22 is a positive temperature coefficient resistor.
Since R11/R21 is R12/R22, in order to avoid sudden gain changes at the moment of switching, the gain of the power amplifier is the same before and after switching at the threshold of the gain control temperature detection unit.
When the switch is turned off, the amplification factor of the power amplifier is as follows:
Y＝{R21+R22[(1-k22)(T-25)]}/{R11+R12[(1+k12)(T-25)]}
the above R21 is a resistance of the second resistor, T is an operating temperature of the load, R11 is a resistance of the first resistor, R12 is a resistance of the third resistor, K12 is a temperature coefficient of the third resistor, K2 is a temperature coefficient of the fourth resistor, and 25 is a temperature of room temperature.
With the temperature rise, the amplification factor is smaller and smaller, and different temperature characteristics can be obtained by adjusting the proportion of R11 to R12, R21 to R22.
When the output power is increased and the temperature of the power amplifier is increased, the amplification factor is reduced, the increase of the output power is slowed down, and the power amplifier cannot enter an over-temperature state.
The utility model discloses an in the embodiment, R11 and R21 temperature coefficient are less or no temperature.
It should be noted that the resistance of the positive temperature coefficient resistor increases with increasing temperature, and the resistance of the negative temperature coefficient resistor decreases with increasing temperature.
The temperature control circuit is provided with a resistor with a temperature coefficient, and whether the resistor with the temperature coefficient is introduced or not can be controlled by controlling the working temperature of the load detected by the temperature detection unit through the gain.
Example 3
As shown in figure 3 of the drawings,
in addition, the embodiment of the utility model provides a temperature control circuit is still provided, include: the device comprises a first temperature control branch, a second temperature control branch and a gain control unit;
the first temperature control branch comprises a first resistor R11;
the second temperature control branch comprises a second resistor R21 and a fourth resistor R22, and the second resistor R21 and the fourth resistor R22 are arranged in series;
one end of the fourth resistor R22 is connected with the second resistor R21, and one end of the fourth resistor R22 far away from the second resistor R21 is connected with an electronic element output end;
the gain control unit is connected with a common end of the second resistor R21 and the fourth resistor R22 through a second switch S2, and the gain control unit controls whether the fourth resistor R22 is introduced into the temperature control circuit or not by controlling the opening or closing of the second switch S2.
In this embodiment, the fourth resistor is a resistor with a temperature coefficient, and when the second switch is turned off, the gain of the electronic component is: x2 is (R21+ R22)/R11, R21 is the resistance of the second resistance, R11 is the resistance of the first resistance, and R22 is the resistance of the fourth resistance.
The magnification of the electronic component is:
Y＝{R21+R22[(1-k22)(T-25)]}/{R11[(T-25)]}
r21 is a resistance of the second resistor, T is an operating temperature of the electronic component, R11 is a resistance of the first resistor, R22 is a resistance of the fourth resistor, K22 is a temperature coefficient of the fourth resistor, and 25 is a temperature of room temperature.
The rest is the same as those of embodiment 2 and embodiment 3, and thus, the description thereof is omitted.
The utility model discloses an in the embodiment, when above-mentioned first switch and above-mentioned second switch closure, the gain of above-mentioned load is: x1 ═ R21/R11, where R21 is the resistance of the second resistor and R11 is the resistance of the first resistor;
when the first switch and the second switch are turned off, the gain of the load is: x2 is (R21+ R22)/(R11+ R12), R21 is the resistance of the second resistance, R22 is the resistance of the fourth resistance, R11 is the resistance of the first resistance, and R12 is the resistance of the third resistance.
Preferably, a ratio of the resistance of the first resistance to the second resistance is equal to a ratio of the third resistance to the fourth resistance.
The embodiment of the utility model provides an in increase a gain control temperature detecting element, the temperature threshold value that its detected is less than the protection threshold value of excess temperature protection temperature detecting element, and is lower when the temperature, when not reaching gain control temperature detecting element's detection threshold value, the circuit that has the temperature coefficient is by the closed short circuit of switch, does not play a role to power amplifier's magnification. When the temperature rises and reaches the detection threshold value of the gain control temperature detection unit, the switch is switched off, and a temperature coefficient resistor is introduced into the amplification path.
In summary, the electronic component in the technical solution disclosed in the above embodiment may be a power amplifier, so that the power amplifier can provide maximum output power at different environmental temperatures, and is not limited by the application environmental temperature.
The utility model also provides a temperature control method, include:
step S01 of comparing the acquired temperature of the electronic component with a detection threshold of the gain control temperature detection unit;
step S02, if the working temperature of the obtained electrons is less than the detection threshold value of the gain control unit, controlling the first switch and/or the second switch to be closed; and if the acquired temperature of the electronic element is not less than the detection threshold value of the gain control temperature detection unit, controlling the first switch and the second switch to be opened, and introducing a third resistor and/or a fourth resistor to control the gain of the electronic element.
Preferably, the third resistor is a positive temperature coefficient resistor, and the fourth resistor is a negative temperature coefficient resistor; or the third resistor is a resistor with a negative temperature coefficient, and the fourth resistor is a resistor with a positive temperature coefficient.
Preferably, when the temperature control circuit is provided with a first switch and a second switch, and the first switch and the second switch are closed, the gain of the electronic element is: x1 ═ R21/R11, where R21 is the resistance of the second resistor and R11 is the resistance of the second resistor;
when the first switch and the second switch are turned off, the gain of the electronic element is as follows: x2 is (R21+ R22)/(R11+ R12), R21 is the resistance of the second resistance, R22 is the resistance of the fourth resistance, R11 is the resistance of the first resistance, and R12 is the resistance of the third resistance.
Preferably, a ratio of the resistance of the first resistor to the second resistor is equal to a ratio of the third resistor to the fourth resistor.
When only the first switch S1 is provided in the temperature control circuit, when the first switch S1 is closed, the gain of the load is: x1 ═ R21/R11, R21 is the resistance of the second resistor, and R11 is the resistance of the second resistor;
when the first switch S1 is turned off, the gain of the electronic component is: x2 ═ R21/(R11+ R12), R21 is the resistance of the second resistance, R11 is the resistance of the first resistance, and R12 is the resistance of the third resistance.
When only the second switch S2 is provided in the temperature control circuit, when the second switch S2 is closed, the gain of the electronic component is: x1 ═ R21/R11, R21 is the resistance of the second resistor, and R11 is the resistance of the second resistor;
when the second switch S2 is turned off, the gain of the electronic component is: x2 is (R21+ R22)/R11, R21 is the resistance of the second resistance, R11 is the resistance of the first resistance, and R22 is the resistance of the fourth resistance.
The electronic element of the disclosed embodiment can give the maximum output power under different environmental temperatures, and is not limited by the application environmental temperature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (11)
1. A temperature control circuit, comprising: the device comprises a first temperature control branch, a second temperature control branch and a gain control unit;
the first temperature control branch comprises a first resistor and a third resistor, and the first resistor and the third resistor are arranged in series;
the second temperature control branch comprises a second resistor;
one end of the third resistor, which is far away from the first resistor, is connected with the second resistor, a common end of the third resistor and the second resistor is connected with an input end of an electronic element, and one end of the second resistor, which is far away from the third resistor, is connected with an output end of the electronic element;
the gain control unit is connected with the common end of the first resistor and the third resistor through a first switch, and the gain control unit controls whether the third resistor is introduced into the temperature control circuit or not by controlling the opening or closing of the first switch.
2. A temperature control circuit according to claim 1, wherein said third resistor is a positive temperature coefficient resistor.
3. The temperature control circuit of claim 2, further comprising a fourth resistor, wherein one end of the fourth resistor is connected to an end of the second resistor, which is far from the third resistor, the other end of the fourth resistor is connected to an output terminal of the electronic component, the gain control unit is connected to a common terminal of the first resistor and the third resistor through a first switch, the gain control unit is connected to a common terminal of the second resistor and the fourth resistor through a second switch, and the gain control unit controls whether the third resistor and the fourth resistor are introduced into the temperature control circuit by controlling the first switch and the second switch to be opened or closed.
4. A temperature control circuit according to claim 3, wherein said fourth resistor is a negative temperature coefficient resistor.
5. A temperature control circuit according to claim 3,
when the first switch and the second switch are closed, the gain of the electronic element is: x1 ═ R21/R11, R21 is the resistance of the second resistor, and R11 is the resistance of the first resistor;
when the first switch and the second switch are turned off, the gain of the electronic element is: x2 is (R21+ R22)/(R11+ R12), R21 is the resistance of the second resistance, R22 is the resistance of the fourth resistance, R11 is the resistance of the first resistance, and R12 is the resistance of the third resistance.
6. A temperature control circuit according to claim 5, wherein the ratio of the resistance of said first resistor to said second resistor is equal to the ratio of said third resistor to said fourth resistor.
7. The temperature control circuit of claim 6, further comprising an over-temperature protection temperature detection unit, wherein the over-temperature protection temperature detection unit is configured to detect an operating temperature of the electronic component, compare the operating temperature of the electronic component with a protection threshold of the over-temperature protection temperature detection unit, and turn off the electronic component if the operating temperature of the electronic component exceeds the protection threshold of the over-temperature protection temperature detection unit.
8. A temperature control circuit according to claim 7, wherein the protection threshold of the over-temperature protection temperature detection unit is greater than the detection threshold of the gain control unit.
9. A temperature control circuit according to any one of claims 1 to 8, wherein the electronic component is a power amplifier.
10. A temperature control circuit, comprising: the device comprises a first temperature control branch, a second temperature control branch and a gain control unit;
the first temperature control branch comprises a first resistor,
the second temperature control branch comprises a second resistor and a fourth resistor, and the second resistor and the fourth resistor are arranged in series;
one end of the fourth resistor is connected with the second resistor, and one end of the fourth resistor, which is far away from the second resistor, is connected with an output end of the electronic element;
the gain control unit is connected with the common end of the second resistor and the fourth resistor through a second switch, and the gain control unit controls whether the fourth resistor is introduced into the temperature control circuit or not by controlling the opening or closing of the second switch.
11. A temperature control circuit according to claim 10, wherein said fourth resistor is a negative temperature coefficient resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920793252.2U CN210074762U (en) | 2019-05-29 | 2019-05-29 | Temperature control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920793252.2U CN210074762U (en) | 2019-05-29 | 2019-05-29 | Temperature control circuit |
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| CN210074762U true CN210074762U (en) | 2020-02-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212496A (en) * | 2019-05-29 | 2019-09-06 | 上海韦尔半导体股份有限公司 | A kind of temperature-control circuit and method |
| CN110212496B (en) * | 2019-05-29 | 2024-05-28 | 上海韦尔半导体股份有限公司 | Temperature control circuit and method |
-
2019
- 2019-05-29 CN CN201920793252.2U patent/CN210074762U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212496A (en) * | 2019-05-29 | 2019-09-06 | 上海韦尔半导体股份有限公司 | A kind of temperature-control circuit and method |
| CN110212496B (en) * | 2019-05-29 | 2024-05-28 | 上海韦尔半导体股份有限公司 | Temperature control circuit and method |
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