CN201345060Y

CN201345060Y - Negative feedback hysteresis comparator for controlling temperature

Info

Publication number: CN201345060Y
Application number: CNU2009201049753U
Authority: CN
Inventors: 田峻杨; 阳启明; 曲绍贤; 张志伟
Original assignee: China Aerospace Modern Electronic Co 772nd Institute; Mxtronics Corp
Current assignee: China Aerospace Modern Electronic Co 772nd Institute; Mxtronics Corp
Priority date: 2009-01-13
Filing date: 2009-01-13
Publication date: 2009-11-11
Anticipated expiration: 2019-01-13

Abstract

A negative feedback hysteresis comparator for controlling temperature adopts a circuit structure in the form of negative feedback; output terminals of a voltage comparator are connected with phase inverters taking a current supply as load, thereby improving the gain of the circuit; meanwhile, output signals of the two phase inverters can be fed back to input terminals of the voltage comparator through two feedback circuits respectively, thereby effectively reducing the influence of noises. The circuit structure is suitable for processing voltage signals collected by a temperature sensor in a temperature controlling circuit; and the negative feedback hysteresis comparator can effectively avoid the output of false signals caused by fluctuation of voltage signals collected by the temperature sensor due to the temperature fluctuation, and can output processed accurate signals to a last-stage controlling circuit.

Description

A kind ofly be used for temperature controlled negative feedback hysteresis comparator

Technical field

The utility model relates to a kind of temperature-control circuit, particularly a kind of hysteresis comparator that adopts negative-feedback principle.

Background technology

Usually, carrying out temperature controlled hysteresis comparator in consumer electronic product is to adopt the positive feedback principle to realize, for example application number is CN88221189.7, name is called comparer F007A involved in a kind of patented claim of temperature controller, application number is CN92230424.6, name is called comparer IC involved in the patented claim of fish jar electronic temperature controller, and application number is CN200320119157.3, and name is called comparer IC involved in the self-locking electronic temperature control device etc. and all uses the circuit structure of positive feedback to realize hysteresis comparator.The hysteresis comparator temperature control precision that adopts the positive feedback principle to realize is low, and noise resisting ability is poor, causes easily that when temperature fluctuation temperature sensor gathers the fluctuation of voltage signal and the output of the signal that leads to errors, thereby influences the operate as normal of late-class circuit.

The utility model content

Technology of the present utility model is dealt with problems and is: overcome the deficiencies in the prior art, the temperature controlled negative feedback hysteresis comparator that is used for that a kind of antijamming capability is strong, control accuracy is high is provided.

Technical solution of the present utility model is: a kind ofly be used for temperature controlled negative feedback hysteresis comparator, comprise that difference input circuit, negative-feedback circuit, current source load phase inverter and two recommend phase inverter; The difference input circuit comprises PMOS pipe M11, M12, M13, and NMOS manages M14, M15, and resistance R 1, R2; Negative-feedback circuit comprises PMOS pipe M1, M2, M3; The current source load phase inverter comprises PMOS pipe M10 and NMOS pipe M5; First recommends phase inverter comprises PMOS pipe M9 and NMOS pipe M6, and second recommends phase inverter comprises PMOS pipe M8 and NMOS pipe M7; The grid termination bias voltage of M11, the source electrode termination power of M11, the drain electrode end of M11 connects the source terminal of M12 and M13 simultaneously, the output of the gate terminal jointing temp sensor of M12, the drain electrode end of M12 connects the gate terminal of drain electrode end and the M5 of M15 simultaneously, the grid termination reference input voltage of M13, the drain electrode end of M13 connects drain electrode end and the gate terminal of M14 simultaneously, the gate terminal of M14 links to each other with the gate terminal of M15, series resistor R2 between the source terminal of M14 and the ground, series resistor R1 between the source terminal of M15 and the ground; The grid termination bias voltage of M1, the source electrode termination power of M1, the drain electrode end of M1 connects the source terminal of M2 and M3 simultaneously, the source terminal of the drain electrode termination M14 of M2, the gate terminal of M2 connects the drain electrode end of M7 and M8 simultaneously, the source terminal of the drain electrode termination M15 of M3, the gate terminal of M3 connect the gate terminal of drain electrode end and M7 and the M8 of M9 and M6 simultaneously; The grid termination bias voltage of M10, the source electrode termination power of M10, the drain electrode end of M10 connect the gate terminal of drain electrode end and M6 and the M9 of M5, the source terminal ground connection of M5 simultaneously; The source electrode termination power of M9, the source terminal ground connection of M6; The source electrode termination power of M8, the source terminal ground connection of M7, the drain electrode end of M7 and M8 is as the output terminal of negative feedback hysteresis comparator.

The utility model advantage compared with prior art is: the utility model hysteresis comparator adopts the circuit structure of negative feedback type, output terminal connection at voltage comparator is the gain of the phase inverter of load with the raising circuit with the current source, simultaneously the output signal of two phase inverters is fed back to the input end of voltage comparator respectively by two backfeed loops, can effectively reduce The noise, be suitable for the processing of the voltage signal that the reception temperature sensor is gathered in temperature-control circuit, can avoid the error effect and the temperature fluctuation of sensor self effectively, the influence that factors such as environment temperature cause improves temperature controlled precision.

Description of drawings

Fig. 1 carries out temperature controlled theory diagram for adopting the utility model hysteresis comparator;

Fig. 2 is the circuit theory diagrams of the utility model hysteresis comparator.

Embodiment

As shown in Figure 1, for adopting negative feedback hysteresis comparator of the present utility model to carry out temperature controlled schematic diagram.Predefined reference input voltage is delivered to the in-phase input end of hysteresis comparator, the voltage signal that the temperature sensor sense collects is input to the inverting input of hysteresis comparator, hysteresis comparator compares the magnitude of voltage that the reference input voltage set and temperature sensor collect, and determines the control signal (for example controlling the switch of heating arrangement) of late-class circuit.For temperature-control circuit, need consider the influence of many-sided factors such as error, temperature fluctuation and environment temperature of temperature sensor self, therefore require hysteresis comparator to have stronger antijamming capability.The utility model adopts the requirement of the complete satisfied temperature control of the hysteresis comparator of negative-feedback principle design.

Fig. 2 is the circuit theory diagrams of the utility model hysteresis comparator, it comprises the first order difference input circuit that is made of PMOS pipe M11, M12, M13 and NMOS pipe M14, M15 and resistance R 1, R2, manage the current source load phase inverter that M5 constitutes by PMOS pipe M10 and NMOS, first recommend phase inverter by what PMOS pipe M9 and NMOS pipe M6 constituted, second recommend phase inverter by what PMOS pipe M8 and NMOS pipe M7 constituted, and the negative feedback that constitutes by PMOS pipe M1, M2, M3.As shown in Figure 2, the gate terminal of M11 is connected to bias voltage Vbias, suitable bias current is provided for two difference branch roads, the source terminal of M11 is connected to power supply, the drain electrode end of M11 is connected to the source terminal of M12 and M13, and the gate terminal of M13 is connected to reference potential, receives predefined reference input voltage Vref, the gate terminal of M12 is connected to temperature sensor, receives the temperature voltage signal that is transmitted by temperature sensor.The drain electrode end of M13 is connected to the drain electrode end of M14, series resistor R2 between the source terminal of M14 and ground, the drain electrode end of M12 is connected to the drain electrode end of M15, series resistor R1 between the source terminal of M15 and ground, the drain electrode end of M14 and gate terminal link together and are connected to form mirror current source with the gate terminal of M15, as the active load of differential amplifier.The drain electrode end of M12 is connected to the gate terminal of M5, and the comparative result of reference voltage and temperature voltage signal is output to the gate terminal of M5 thus.The source terminal ground connection of M5, the drain electrode end of M5 is connected to the drain electrode end of M10, the source electrode termination power of M10, the gate terminal of M10 is connected to bias voltage Vbias, M10 and M5 constitute the current source load phase inverter herein, the comparative result of exporting from the drain electrode end of M12 is amplified,, can obtain bigger gain thus because the current source load phase inverter that M10 and M5 constitute has bigger enlargement factor.The drain electrode end of M5 is connected to the gate terminal of M9 and M6, and the comparative result after amplifying thus outputs to the phase inverter that connects later by the drain electrode end of M5.The source terminal ground connection of M6, the drain electrode end of M6 is connected with the drain electrode end of M9, the source electrode termination power of M9, the gate terminal of M6 is connected with the gate terminal of M9, constitutes one thus and recommends phase inverter.The drain electrode end of M6 is connected to the gate terminal of M8 and M7, will be transferred to the phase inverter that is made of M7 and M8 from the signal that the phase inverter of M9 and M6 formation is exported thus.The source terminal ground connection of M7, the drain electrode end of M7 is connected with the drain electrode end of M8, the source electrode termination power of M8, the gate terminal of M7 is connected with the gate terminal of M8, constitutes another thus and recommends phase inverter.The source electrode termination power of M1, the gate terminal of M1 is connected to bias voltage Vbias, and the drain electrode end of M1 links to each other with the source terminal of M2 and M3, and the gate terminal of M3 is connected to the drain electrode end of M6, the drain electrode end of M3 is connected to the source terminal of M15, and output signal forms a negative feedback loop by M1, M3 and R1 thus; The gate terminal of M2 is connected to the drain electrode end of M7, and the drain electrode end of M2 is connected to the source terminal of M14, and output signal forms another negative feedback loop by M1, M2 and R2 thus, constitutes the hysteresis comparator of a negative feedback type thus.The substrate of P pipe M1, M8, M9, M10, M11, M12 and M13 connects power supply among the figure, and the substrate ground connection of N pipe M2, M3, M5, M6, M7, M14 and M15 is used for suppressing the inclined to one side effect of lining.

Though the hysteresis comparator of employing negative feedback structure has reduced the sensitivity of circuit, strengthened the antijamming capability of circuit, guaranteed the correctness of circuit output signal.For example, the last lower threshold voltage with negative feedback hysteresis comparator of the present utility model is set in Vref+20mv and Vref-20mv respectively.When the voltage signal that collects when the temperature temperature sensor surpassed reference voltage 20mv like this, the digital signal after the hysteresis comparator output relatively of the present utility model stopped heating for the control circuit of heating arrangement; When the voltage signal that collects when temperature sensor is lower than reference voltage 20mv, digital signal after the hysteresis comparator output relatively of the present utility model begins heating for the control circuit of heating arrangement, so just temperature accurately can be controlled near the temperature spot of setting.

The content of not describing in detail in the utility model instructions belongs to those skilled in the art's known technology.

Claims

1, a kind ofly be used for temperature controlled negative feedback hysteresis comparator, it is characterized in that comprising: difference input circuit, negative-feedback circuit, current source load phase inverter and two recommend phase inverter; The difference input circuit comprises PMOS pipe M11, M12, M13, and NMOS manages M14, M15, and resistance R 1, R2; Negative-feedback circuit comprises PMOS pipe M1, M2, M3; The current source load phase inverter comprises PMOS pipe M10 and NMOS pipe M5; First recommends phase inverter comprises PMOS pipe M9 and NMOS pipe M6, and second recommends phase inverter comprises PMOS pipe M8 and NMOS pipe M7; The grid termination bias voltage of M11, the source electrode termination power of M11, the drain electrode end of M11 connects the source terminal of M12 and M13 simultaneously, the output of the gate terminal jointing temp sensor of M12, the drain electrode end of M12 connects the gate terminal of drain electrode end and the M5 of M15 simultaneously, the grid termination reference input voltage of M13, the drain electrode end of M13 connects drain electrode end and the gate terminal of M14 simultaneously, the gate terminal of M14 links to each other with the gate terminal of M15, series resistor R2 between the source terminal of M14 and the ground, series resistor R1 between the source terminal of M15 and the ground; The grid termination bias voltage of M1, the source electrode termination power of M1, the drain electrode end of M1 connects the source terminal of M2 and M3 simultaneously, the source terminal of the drain electrode termination M14 of M2, the gate terminal of M2 connects the drain electrode end of M7 and M8 simultaneously, the source terminal of the drain electrode termination M15 of M3, the gate terminal of M3 connect the gate terminal of drain electrode end and M7 and the M8 of M9 and M6 simultaneously; The grid termination bias voltage of M10, the source electrode termination power of M10, the drain electrode end of M10 connect the gate terminal of drain electrode end and M6 and the M9 of M5, the source terminal ground connection of M5 simultaneously; The source electrode termination power of M9, the source terminal ground connection of M6; The source electrode termination power of M8, the source terminal ground connection of M7, the drain electrode end of M7 and M8 is as the output terminal of negative feedback hysteresis comparator.