CN115617090A - Temperature sensor circuit, working method and temperature control system - Google Patents
Temperature sensor circuit, working method and temperature control system Download PDFInfo
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Abstract
The invention discloses a temperature sensor circuit, a working method and a temperature control system, which relate to the technical field of circuit design, wherein the temperature sensor circuit comprises: the first current mirror load sub-circuit, the temperature measuring sub-circuit, the over-current protection sub-circuit and the trimming resistance sub-circuit are electrically connected in sequence; the first current mirror load sub-circuit is used for providing a load current for the temperature measuring sub-circuit; the over-current protection sub-circuit is used for detecting the current value on the temperature measuring sub-circuit and reducing the current value to a target current value under the condition that the current value is greater than or equal to a preset current threshold value; the temperature measuring sub-circuit is used for determining the ambient temperature based on the temperature characteristic of the temperature measuring sub-circuit, generating a voltage in direct proportion to the ambient temperature, and outputting an output voltage related to the temperature according to the proportion of a plurality of adjustable resistors in the adjustable resistor sub-circuit.
Description
Technical Field
The invention relates to the technical field of circuit design, in particular to a temperature sensor circuit, a working method and a temperature control system.
Background
With the rapid development of integrated circuits, the scale and power consumption of the circuits are getting larger and larger; meanwhile, the temperature range of the working environment where the circuit system is located is wide; in addition, part of the circuits also need to track temperature changes to realize temperature compensation or thermal management, and the monitoring of the temperature changes of the chip core becomes more important, so that a Complementary Metal Oxide Semiconductor (CMOS) temperature sensor which is easy to integrate is widely applied.
In a traditional CMOS temperature sensor circuit design, temperature is usually converted into an analog signal, and then a digital signal is obtained through a high-precision analog-to-digital converter circuit. The temperature sensor has a complex structure and large power consumption and area, however, for most System-on-a-Chip (SOC) systems, the temperature sensor module only needs to monitor the temperature of the core and ensure the good operation of the main circuit.
The precision requirement of the temperature sensor is not high, and the design of the high-precision temperature sensor brings the problems of design complexity and cost, so that the design of the CMOS temperature sensor with relatively low precision and low cost can bring convenience to a plurality of medium-low precision temperature sensing scenes.
Disclosure of Invention
The invention aims to provide a temperature sensor circuit, a working method and a temperature control system, which are used for solving the problems that the precision requirement of a temperature sensor is not high, and the design complexity and the cost are caused by designing a high-precision temperature sensor.
In a first aspect, the present invention provides a temperature sensor circuit comprising: the first current mirror load sub-circuit, the temperature measuring sub-circuit, the over-current protection sub-circuit and the trimming resistor sub-circuit are electrically connected in sequence;
the first current mirror load sub-circuit is used for providing load current for the temperature measuring sub-circuit;
the over-current protection sub-circuit is used for detecting the current value on the temperature measuring sub-circuit and reducing the current value to a target current value under the condition that the current value is greater than or equal to a preset current threshold value;
the temperature measuring sub-circuit is used for determining the ambient temperature based on the temperature characteristic of the temperature measuring sub-circuit, generating voltage in proportion to the ambient temperature, and outputting output voltage related to the temperature according to the proportion of the plurality of adjustable resistors in the adjustable resistor sub-circuit.
As can be seen from the above, the temperature sensor circuit provided by the present invention can be used to provide a load current to the temperature measuring sub-circuit 20 through the first current mirror load sub-circuit 10; the overcurrent protection sub-circuit 30 is used for detecting the current value on the temperature measuring sub-circuit 20, and reducing the current value to a target current value when the current value is greater than or equal to a preset current threshold value, so that the overcurrent protection effect is increased, the circuit cannot be damaged due to overlarge current during short circuit, and the reliability and the safety of the circuit are ensured; the temperature measuring sub-circuit 20 is configured to determine an ambient temperature based on a temperature characteristic of the temperature measuring sub-circuit, generate a voltage proportional to the ambient temperature, and output an output voltage related to the temperature according to a ratio of the plurality of trimmable resistors in the trimming resistor sub-circuit 40, that is, an output voltage linear to the temperature can be obtained by adjusting the ratio of the plurality of trimmable resistors.
In one possible implementation, the first current mirror load sub-circuit includes a first transistor and a second transistor, and the temperature measuring sub-circuit includes: a first triode and a second triode; the trimming resistor sub-circuit comprises a first trimmable resistor, a second trimmable resistor and a third trimmable resistor;
the control end of the first transistor is electrically connected with the control end of the second transistor; the input end of the first transistor and the input end of the second transistor are both connected with a power supply; the output end of the first transistor is electrically connected with the input end of the second triode; the output end of the second transistor is electrically connected with the input end of the first triode; the output end of the first triode is electrically connected with one end of the first trimmable resistor; the other end of the first adjustable resistor is electrically connected with the control end of the first triode; one end of the second adjustable resistor is electrically connected with the control end of the first triode; the other end of the second adjustable resistor is electrically connected with the control end of the second triode; one end of the third adjustable resistor is electrically connected with the control end of the first triode; the other end of the third adjustable resistor is grounded.
In one possible implementation, the temperature sensor circuit further includes a self-biasing current mirror circuit electrically connected to the trimming resistor sub-circuit;
the trimming resistor sub-circuit is also used for providing self-bias current for the self-bias current mirror circuit;
the self-bias current mirror circuit is used for generating self-bias voltage according to the self-bias current.
In one possible implementation, the temperature sensor circuit further includes a second current mirror load sub-circuit electrically connected to the self-biasing current mirror circuit;
the self-bias current mirror circuit is further for providing the self-bias voltage to the second current mirror load sub-circuit;
and the second current mirror load sub-circuit is used for providing load voltage for the temperature measuring sub-circuit under the action of the self-bias voltage.
In one possible implementation, the temperature sensor circuit further includes an output stage operational amplifier sub-circuit electrically connected to the second current mirror load sub-circuit;
the second current mirror load sub-circuit is used for providing an operational amplifier voltage for the output stage operational amplifier sub-circuit under the action of the self-bias voltage;
and the output-stage operational amplifier sub-circuit is used for providing the load voltage for the temperature measuring sub-circuit under the action of the operational amplifier voltage.
In one possible implementation manner, the output-stage operational amplifier sub-circuit comprises a third transistor, a fourth transistor and a first resistor;
wherein an input terminal of the third transistor and an output terminal of the fourth transistor are both connected to the power supply; the control end of the third transistor is electrically connected with the output end of the second transistor; the output end of the third transistor is electrically connected with the control end of the fourth transistor; an output end of the fourth transistor is electrically connected with one end of the first resistor; the other end of the first resistor is electrically connected with the output end of the first triode.
In one possible implementation manner, the over-current protection sub-circuit comprises a sixth transistor and a second resistor;
the control end of the sixth transistor is electrically connected with one end of the second resistor;
the input end of the sixth transistor is electrically connected with the control end of the first triode;
and the output end of the sixth transistor and the other end of the second resistor are both grounded.
In one possible implementation, the temperature sensor circuit further includes a seventh transistor and a fifth transistor; the seventh transistor is an output buffer stage and is used for providing proper bias voltage for the second trimmable resistor and the third trimmable resistor; the fifth transistor is used for detecting the current of the first transistor and the second transistor and transmitting the detected current to the second resistor.
In a second aspect, the present invention provides a method for operating a temperature sensor circuit, which is applied to the temperature sensor circuit of the first aspect, and the temperature sensor circuit includes: the working method comprises the following steps of sequentially and electrically connecting a first current mirror load sub-circuit, a temperature measuring sub-circuit and a trimming resistor sub-circuit, wherein the working method comprises the following steps:
controlling the current mirror load sub-circuit to provide a load current to the temperature measuring sub-circuit; and controlling the temperature measuring sub-circuit to determine the ambient temperature based on the temperature characteristic of the temperature measuring sub-circuit, generating a voltage proportional to the ambient temperature, and outputting an output voltage related to the temperature according to the proportion of the plurality of adjustable resistors in the adjustable resistor sub-circuit.
Compared with the prior art, the beneficial effects of the working method of the temperature sensor circuit provided by the invention are the same as those of the temperature sensor circuit in the first aspect, and are not repeated here.
In a third aspect, the present invention provides a temperature control system comprising a temperature sensor circuit according to any one of the first aspect.
Compared with the prior art, the beneficial effects of the temperature control system provided by the invention are the same as those of the temperature sensor circuit in the first aspect, and are not repeated here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:
fig. 1 is a schematic circuit diagram illustrating a temperature sensor circuit provided in an embodiment of the present application;
fig. 2 shows a schematic circuit structure diagram of a temperature measuring sub-circuit according to an embodiment of the present application.
Reference numerals
10-a first current mirror load sub-circuit; 20-a temperature measuring sub-circuit; 30-an overcurrent protection sub-circuit; 40-trimming a resistor sub-circuit; 50-self-biased current mirror circuit; 60-a second current mirror load sub-circuit; 70-output stage operational amplifier subcircuit; m1-a first transistor; m2 — a second transistor; q1-a first triode; q2-a second triode; r OFF -a first trimmable resistance; r PTAT -a second trimmable resistance; r GAIN -a third trimmable resistance; m3-a third transistor; m4-a fourth transistor; r 1 -a first resistance; m6-sixth transistor; r is 2 -a second resistance; m7-a seventh transistor; m5-a fifth transistor; m8-an eighth transistor; m9-a ninth transistor; m10-tenth transistor; m11 — eleventh transistor; m12-twelfth transistor.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention 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 merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 illustrates a schematic circuit structure diagram of a temperature sensor circuit according to an embodiment of the present invention. Referring to fig. 1, a temperature sensor circuit according to an embodiment of the present invention includes: the circuit comprises a first current mirror load sub-circuit 10, a temperature measuring sub-circuit 20, an over-current protection sub-circuit 30 and a trimming resistance sub-circuit 40 which are electrically connected in sequence.
The first current mirror load sub-circuit 10 is used for providing a load current for the temperature measuring sub-circuit 20;
the over-current protection sub-circuit 30 is configured to detect a current value of the temperature measuring sub-circuit 20, and reduce the current value to a target current value when the current value is greater than or equal to a preset current threshold;
the temperature measuring sub-circuit 20 is configured to determine an ambient temperature based on a temperature characteristic of the temperature measuring sub-circuit, generate a voltage proportional to the ambient temperature, and output an output voltage related to the temperature according to a ratio of the plurality of trimmable resistors in the trimming resistor sub-circuit 40.
In the application, the specific value of the preset current threshold is not limited, and calibration adjustment can be performed according to an actual application scene.
As can be seen from the above, the temperature sensor circuit provided by the present invention can be used to provide a load current to the temperature measuring sub-circuit 20 through the first current mirror load sub-circuit 10; the overcurrent protection sub-circuit 30 is used for detecting the current value on the temperature measuring sub-circuit 20, and reducing the current value to a target current value when the current value is greater than or equal to a preset current threshold value, so that the overcurrent protection effect is increased, the circuit cannot be damaged due to overlarge current during short circuit, and the reliability and the safety of the circuit are ensured; the temperature measuring sub-circuit 20 is configured to determine an ambient temperature based on a temperature characteristic of the temperature measuring sub-circuit, generate a voltage proportional to the ambient temperature, and output an output voltage related to the temperature according to a ratio of the plurality of trimmable resistors in the trimming resistor sub-circuit 40, that is, an output voltage linear to the temperature can be obtained by adjusting the ratio of the plurality of trimmable resistors.
Referring to fig. 1, the first current mirror load sub-circuit 10 includes a first transistor M1 and a second transistor M2. Fig. 2 shows a schematic diagram of a temperature measuring sub-circuit provided in an embodiment of the present application, and referring to fig. 1 or fig. 2, the temperature measuring sub-circuit includes: a first triode Q1 and a second triode Q2; the trimming resistor sub-circuit comprises a first trimming resistor R OFF A second adjustable resistor R PTAT And a third trimmable resistor R GAIN . Wherein a control end of the first transistor 101 is electrically connected to a control end of the second transistor M2; the input end of the first transistor 101 and the input end of the second transistor M2 are both connected to a power supply (VDD); the output end of the first transistor 101 is electrically connected with the input end of the second triode Q2; the output end of the second transistor 202 is electrically connected with the input end of the first triode Q1; the output end of the first triode Q1 and the first adjustable resistor R OFF Is electrically connected with one end of the first connecting rod; the first adjustable resistor R OFF The other end of the first triode is electrically connected with the control end of the first triode Q1; the second adjustable resistor R PTAT One end of the first triode is electrically connected with the control end of the first triode Q1; the second adjustable resistor R PTAT The other end of the second triode is electrically connected with the control end of the second triode Q2; the third adjustable resistor R GAIN One end of the first triode is electrically connected with the control end of the first triode Q1; the third adjustable resistor R GAIN And the other end thereof is Grounded (GND). In fig. 2, the operational amplifier a is also the first transistor M1 and the second transistor M2 in fig. 1.
Optionally, referring to fig. 1, the temperature sensor circuit further comprises a self-biased current mirror circuit 50 electrically connected to the trimming resistor sub-circuit 40.
The trimming resistor sub-circuit 40 is also used to provide a self-bias current to the self-bias current mirror circuit 50. The self-bias current mirror circuit 50 is used to generate a self-bias voltage based on the self-bias current.
The input current of the self-bias current mirror circuit flows through the second adjustable resistor R PTAT Thereby realizing the self-bias function without providing bias from outside.
Referring to fig. 1, the temperature sensor circuit further includes a second current mirror load sub-circuit 60 electrically connected to the self-bias current mirror circuit 50.
The self-bias current mirror circuit 50 is further configured to provide the self-bias voltage to the second current mirror load sub-circuit 60; the second current mirror load sub-circuit 60 is used for providing a load voltage to the temperature measuring sub-circuit 20 under the action of the self-bias voltage.
Referring to fig. 1, the temperature sensor circuit further includes an output stage operational amplifier sub-circuit 70 electrically connected to the second current mirror load sub-circuit 60.
The second current mirror load sub-circuit 60 is configured to provide an operational amplifier voltage to the output stage operational amplifier sub-circuit 60 under the action of the self-bias voltage; the output stage operational amplifier sub-circuit 60 is configured to provide the load voltage to the temperature measuring sub-circuit 20 under the action of the operational amplifier voltage.
Optionally, the output stage operational amplifier 70 includes a third transistor M3, a fourth transistor M4 and a first resistor R 1 。
Wherein, the input end of the third transistor M3 and the output end of the fourth transistor M4 are both connected to the power supply; a control terminal of the third transistor M3 is electrically connected to an output terminal of the second transistor M2; the output end of the third transistor M3 is electrically connected with the control end of the fourth transistor M4; an output terminal of the fourth transistor M4 and the first resistor R 1 Is electrically connected with one end of the first connecting rod; the first resistor R 1 The other end of the second transistor is electrically connected with the output end of the first triode Q1. Wherein, the first resistor is used for limiting current.
Optionally, the over-current protection sub-circuit 70 includes a sixth transistor M6 and a second resistor R 2 。
A control terminal of the sixth transistor M6 and the second resistor R 2 Is electrically connected; the input end of the sixth transistor M6 is electrically connected with the control end of the first triode Q1; an output terminal of the sixth transistor M6 and the second resistor R 2 And the other ends of the two are all grounded. When the current is detected to be excessive, the sixth transistor M6 is turned on, and pulls down the voltage to reduce the current in the circuit.
Referring to fig. 1, the temperature sensor circuit further includes a seventh transistor M7 and a fifth transistor M5, wherein the seventh transistor is an output buffer stage functioning to supply the second trimmable resistor R with the first trimming voltage PTAT And a third trimmable resistor R GAIN Providing a suitable bias voltage. The fifth transistor M5 is used for detecting the current of the first transistor M1 and the second transistor M2 and transmitting the detected current to the second resistor R 2 The above.
Referring to fig. 1, the self-bias current mirror circuit 50 includes an eighth transistor M8 and a ninth transistor M9, a control terminal of the eighth transistor M8 is connected to a control terminal of the ninth transistor M9, an input terminal of the eighth transistor M8 and an input terminal of the ninth transistor M9 are both connected to the power supply, an output terminal of the eighth transistor M8 is connected to an input terminal of the seventh transistor M7, and an output terminal of the ninth transistor M9 is connected to an input terminal of the tenth transistor M10. The input end of the fifth transistor M5 is connected to the power supply, and the control end of the fifth transistor M5 is connected to the control end of the first transistor M1.
Optionally, the second current mirror loads the tenth transistor M10, the eleventh transistor M11 and the twelfth transistor M12 of the sub-circuit 60. A control terminal of the tenth transistor M10, a control terminal of the eleventh transistor M11, and a control terminal of the twelfth transistor M12 are all connected to an output terminal of the ninth transistor M9, an output terminal of the tenth transistor M10, an output terminal of the eleventh transistor M11, and an output terminal of the twelfth transistor M12 are all grounded, an input terminal of the tenth transistor M10 is connected to a control terminal of the twelfth transistor M12 and an output terminal of the ninth transistor M9, an input terminal of the eleventh transistor M11, an output terminal of the first triode Q1, and an output terminal of the second triode Q2 are connected, and an input terminal of the twelfth transistor M12 is connected to the third transistor M3.
Specifically, referring to fig. 2, the temperature measurement principle process of the present application may specifically include: through the clamping action of the operational amplifier A, collector voltages of the first triode Q1 and the second triode Q2 are equal, and collector currents flowing through the first triode Q1 and the second triode Q2 are equal. When the transistors Q1 and Q2 are equal in shape, but the parallel number ratio is N: 1. Neglecting the base current of the triode, the collector current adopts an approximate formula:
V RPTAT ＝ΔV BE ＝V BE2 -V BE1 ＝V T ln(N) (1)；
wherein, V BE2 The voltage between the base electrode and the emitting electrode of the second triode Q2 is referred to; v BE1 The voltage between the base electrode and the emitting electrode of the first triode Q1 is referred; v RPTAT Refers to the voltage, V, of the second trimmable resistor RPTAT T Is hot pressing, an amount proportional to temperature. Δ V BE Refers to the voltage difference between the base emitter voltage of the second triode Q2 and the base emitter voltage of the first triode Q1. When the parallel number ratio of the Q1 to the Q2 is N:1, N Q1 are connected together in parallel, and the current flowing through N Q1 is equal to the current flowing through one Q2.
I PTAT ＝I OFF +I GAIN (2)；
Wherein, I PTAT Refers to the second trimmable resistance R PTAT Current of (I) OFF Refers to the first trimmable resistor R OFF Current of (I) GAIN Refer to the third trimmable resistor R GAIN The current of (2).
V OUT ＝V GAIN -V BE1 (4)；V OUT Represents the output voltage; v GAIN Indicating a third trimmable resistance R GAIN The voltage of (c).
Through V OUT The temperature is derived to obtain:
wherein, due to V BE1 And Δ V BE For good temperature coefficient, V BE1 Has a temperature coefficient of about 1.5mV/K, Δ V BE Has a temperature coefficient of about 0.087mVK. K is the unit Calvin of temperature, does not influence the output V of degree centigrade OUT But the conversion of calvin to celsius requires a reasonable adjustment V OUT A static operating point of (2). By setting expression (5) at the correct output at a single temperature while satisfying the full temperature range
The function of the temperature sensor of analog output can be realized.
By way of example, the specific operation process of the temperature sensor circuit in the present application may include: the circuit can be powered by a linear regulator (LDO) and works at a voltage of 2.7V. The normal temperature measuring range of the circuit is 10-150 ℃. The LDO output is a voltage, and does not change along with the change of the power supply voltage when the LDO works normally, so that the linear voltage regulator can generate a stable voltage to supply power to the circuit. When the circuit is in normal operation, the current in the circuit is less than 30 milliamperes (μ A). By selecting the appropriate R PTAT 、R GAIN 、R OFF The value can make the slope of the output curve reach 10 mV/DEG C. R PTAT The current of the self-bias current mirror is used as the input current of the self-bias current mirror, and the bias current is provided for the whole circuit. Within the temperature measuring range, the output voltage V OUT Varying from 100mV to 1.5V. When V is OUT When the current in the circuit is overlarge due to short circuit, the NMOS tube M6 is conducted, so that the Q1 is turned off, and the function of protecting the circuit is achieved. The temperature sensor circuit in the application can work under the far voltage of 2.7V place, and the quiescent current is low, satisfies the requirement of low-power consumption.
As can be seen from the above, the temperature sensor circuit provided by the present invention can be used to provide a load current to the temperature measuring sub-circuit 20 through the first current mirror load sub-circuit 10; the over-current protection sub-circuit 30 is used for detecting a current value on the temperature measuring sub-circuit 20, and reducing the current value to a target current value when the current value is greater than or equal to a preset current threshold value, so that an over-current protection effect is added, the circuit cannot be damaged due to overlarge current during short circuit, and the reliability and safety of the circuit are ensured; the temperature measuring sub-circuit 20 is configured to determine an ambient temperature based on a temperature characteristic of the temperature measuring sub-circuit, generate a voltage proportional to the ambient temperature, and output a temperature-related output voltage according to a ratio of the plurality of trimmable resistors in the trimming resistor sub-circuit 40, that is, an output voltage linear to the temperature can be obtained by adjusting the ratio of the plurality of trimmable resistors.
The embodiment of the invention also provides a temperature control system which comprises at least one temperature sensor circuit.
Compared with the prior art, the beneficial effects of the temperature control system provided by the invention are the same as those of the temperature sensor circuit, and are not repeated herein.
The embodiment of the invention provides a working method of a temperature sensor circuit, which is applied to the temperature sensor circuit, wherein the temperature sensor circuit comprises the following components: the working method comprises the following steps of sequentially and electrically connecting a first current mirror load sub-circuit, a temperature measuring sub-circuit and a trimming resistance sub-circuit, wherein the working method comprises the following steps:
controlling the current mirror load sub-circuit to provide a load current to the temperature measuring sub-circuit; and controlling the temperature measuring sub-circuit to determine the ambient temperature based on the temperature characteristic of the temperature measuring sub-circuit, generating a voltage proportional to the ambient temperature, and outputting an output voltage related to the temperature according to the proportion of the plurality of adjustable resistors in the adjustable resistor sub-circuit.
Compared with the prior art, the beneficial effects of the working method of the temperature sensor circuit provided by the invention are the same as those of the temperature sensor circuit, and the details are not repeated here.
While alternative embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including alternative embodiments and all such alterations and modifications as fall within the true scope of the embodiments of the invention.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or terminal apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or terminal apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional identical elements in an article or terminal device comprising the element.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A temperature sensor circuit, comprising: the first current mirror load sub-circuit, the temperature measuring sub-circuit, the over-current protection sub-circuit and the trimming resistance sub-circuit are electrically connected in sequence;
the first current mirror load sub-circuit is used for providing a load current for the temperature measuring sub-circuit;
the over-current protection sub-circuit is used for detecting the current value on the temperature measuring sub-circuit and reducing the current value to a target current value under the condition that the current value is greater than or equal to a preset current threshold value;
the temperature measuring sub-circuit is used for determining the ambient temperature based on the temperature characteristic of the temperature measuring sub-circuit, generating voltage in proportion to the ambient temperature, and outputting output voltage related to the temperature according to the proportion of the plurality of adjustable resistors in the adjustable resistor sub-circuit.
2. The temperature sensor circuit of claim 1, wherein the first current mirror load sub-circuit comprises a first transistor and a second transistor, and wherein the thermometry sub-circuit comprises: a first triode and a second triode; the trimming resistor sub-circuit comprises a first trimmable resistor, a second trimmable resistor and a third trimmable resistor;
the control end of the first transistor is electrically connected with the control end of the second transistor; the input end of the first transistor and the input end of the second transistor are both connected with a power supply; the output end of the first transistor is electrically connected with the input end of the second triode; the output end of the second transistor is electrically connected with the input end of the first triode; the output end of the first triode is electrically connected with one end of the first adjustable resistor; the other end of the first adjustable resistor is electrically connected with the control end of the first triode; one end of the second adjustable resistor is electrically connected with the control end of the first triode; the other end of the second adjustable resistor is electrically connected with the control end of the second triode; one end of the third adjustable resistor is electrically connected with the control end of the first triode; the other end of the third adjustable resistor is grounded.
3. The temperature sensor circuit of claim 1, further comprising a self-biasing current mirror circuit electrically connected to the trimming resistor sub-circuit;
the trimming resistor sub-circuit is also used for providing self-bias current for the self-bias current mirror circuit;
the self-bias current mirror circuit is used for generating self-bias voltage according to the self-bias current.
4. The temperature sensor circuit of claim 3, further comprising a second current mirror load sub-circuit electrically connected to the self-biasing current mirror circuit;
the self-bias current mirror circuit is further for providing the self-bias voltage to the second current mirror load sub-circuit;
and the second current mirror load sub-circuit is used for providing load voltage for the temperature measuring sub-circuit under the action of the self-bias voltage.
5. The temperature sensor circuit of claim 4, further comprising an output stage operational amplifier sub-circuit electrically connected to the second current mirror load sub-circuit;
the second current mirror load sub-circuit is used for providing an operational amplifier voltage for the output stage operational amplifier sub-circuit under the action of the self-bias voltage;
and the output-stage operational amplifier sub-circuit is used for providing the load voltage for the temperature measuring sub-circuit under the action of the operational amplifier voltage.
6. The temperature sensor circuit of claims 2 and 5, wherein the output stage operational amplifier sub-circuit comprises a third transistor, a fourth transistor, and a first resistor;
wherein an input terminal of the third transistor and an output terminal of the fourth transistor are both connected to the power supply; a control end of the third transistor is electrically connected with an output end of the second transistor; the output end of the third transistor is electrically connected with the control end of the fourth transistor; an output end of the fourth transistor is electrically connected with one end of the first resistor; the other end of the first resistor is electrically connected with the output end of the first triode.
7. The temperature sensor circuit of claim 6, wherein the over-current protection sub-circuit comprises a sixth transistor and a second resistor;
the control end of the sixth transistor is electrically connected with one end of the second resistor;
the input end of the sixth transistor is electrically connected with the control end of the first triode;
and the output end of the sixth transistor and the other end of the second resistor are both grounded.
8. The temperature sensor circuit according to claim 7, further comprising a seventh transistor and a fifth transistor; the seventh transistor is an output buffer stage and is used for providing proper bias voltage for the second trimmable resistor and the third trimmable resistor; the fifth transistor is used for detecting the current of the first transistor and the second transistor and transmitting the detected current to the second resistor.
9. A method for operating a temperature sensor circuit, the method being applied to the temperature sensor circuit according to any one of claims 1 to 8, the temperature sensor circuit comprising: the working method comprises the following steps of sequentially and electrically connecting a first current mirror load sub-circuit, a temperature measuring sub-circuit and a trimming resistance sub-circuit, wherein the working method comprises the following steps:
controlling the current mirror load sub-circuit to provide a load current to the temperature measuring sub-circuit; and controlling the temperature measuring sub-circuit to determine the ambient temperature based on the temperature characteristic of the temperature measuring sub-circuit, generating a voltage proportional to the ambient temperature, and outputting an output voltage related to the temperature according to the proportion of the plurality of adjustable resistors in the adjustable resistor sub-circuit.
10. A temperature control system comprising the temperature sensor circuit of any one of claims 1 to 8.
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| CN202110785613.0A CN115617090A (en) | 2021-07-12 | 2021-07-12 | Temperature sensor circuit, working method and temperature control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110785613.0A CN115617090A (en) | 2021-07-12 | 2021-07-12 | Temperature sensor circuit, working method and temperature control system |
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