CN-121710683-B - Temperature controller slow start circuit and method

CN121710683BCN 121710683 BCN121710683 BCN 121710683BCN-121710683-B

Abstract

The invention relates to the technical field of integrated circuit design, in particular to a temperature controller slow start circuit and a temperature controller slow start method, wherein the input end of the slow start circuit is electrically connected with the output end of a temperature detection unit, and the output end is sequentially and electrically connected with a power drive and a semiconductor refrigerator, and the temperature controller slow start circuit comprises a first switch, a second switch, a third switch and a fourth switch; the slow start operational amplifier is characterized in that a non-inverting input end of the slow start operational amplifier is electrically connected with a knife end of the second switch, an inverting input end of the slow start operational amplifier is electrically connected with one end of one resistor of the plurality of resistors and a knife end of the third switch, and an output end of the slow start operational amplifier is electrically connected with a voltage control end driven by power, a non-moving end of the third switch and one end of two capacitors of the plurality of capacitors. The invention enables the temperature controller to be started at zero current under various initial temperatures by controlling the opening and closing of the plurality of analog switches and the enabling of the power driving, thereby reducing the pressure of the concurrent current demand of the power supply of the system to the greatest extent.

Inventors

JIANG ZHONGYA
MEI HENGFANG
LIU YINCAI

Assignees

苏州领慧立芯科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260213

Claims (8)

1. The utility model provides a temperature controller slow start circuit, slow start circuit's input is connected with temperature detection unit's output electricity, and the output is connected with power drive, semiconductor refrigerator electricity in proper order, its characterized in that includes: A plurality of analog switches including a first switch, a second switch, a third switch, and a fourth switch; a resistive-capacitive network comprising a plurality of resistors and a plurality of capacitors; The non-inverting input end of the slow start operational amplifier is electrically connected with one end of one resistor of the plurality of resistors and one end of the third switch, and the output end of the slow start operational amplifier is electrically connected with the voltage control end driven by the power, one stationary end of the third switch and one end of two capacitors of the plurality of capacitors; The controller is used for controlling the opening and closing of the plurality of analog switches and the enabling of the power driving, so that the temperature controller is started at zero current at various initial temperatures, and the pressure of the concurrent current demand of a system power supply is reduced to the greatest extent; the plurality of resistors comprise a set resistor, a proportional resistor, a differential resistor and an integral resistor; The plurality of capacitors includes a differential capacitor, an integral capacitor, and a feedback capacitor; The first switch, the second switch and the third switch are all single-pole double-throw switches; the fourth switch is a single-pole single-throw switch; The knife end of the first switch is electrically connected with the output end of the temperature detection unit, the first stationary end is electrically connected with one end of the setting resistor, one end of the integrating resistor and one end of the differential resistor at the same time, and the second stationary end is electrically connected with one end of the differential capacitor, one end of the feedback capacitor, the first stationary end of the third switch, the stationary end of the fourth switch and one end of the integrating resistor at the same time; The first fixed end of the second switch is electrically connected with the initial voltage of the slow start operational amplifier, and the second fixed end of the second switch is electrically connected with the other end of the setting resistor; the second fixed end of the third switch is electrically connected with the output end of the slow start operational amplifier at the same time; The knife end of the fourth switch is electrically connected with one end of the integrating capacitor and the other end of the integrating resistor at the same time; The other end of the integrating capacitor and the other end of the feedback capacitor are electrically connected with the output end of the slow start operational amplifier; The other end of the differential resistor is electrically connected with the other end of the differential capacitor.
2. The slow start circuit according to claim 1, wherein the temperature detection unit comprises: the detection operational amplifier is characterized in that a non-inverting input end is electrically connected with a half-potential output end of a reference voltage source, and an output end is electrically connected with a knife end of the first switch; One end of the feedback resistor is electrically connected with the inverting input end of the detection operational amplifier, and the other end of the feedback resistor is electrically connected with the output end of the detection operational amplifier; one end of the thermistor is electrically connected with the inverting input end of the detection operational amplifier, and the other end of the thermistor is electrically connected with ground; And one end of the compensation resistor is electrically connected with the output end of the reference voltage source, and the other end of the compensation resistor is electrically connected with the inverting input end of the detection operational amplifier.
3. The slow start circuit of claim 1, wherein the power driver is provided with an enable control terminal, a voltage control terminal, and a differential output terminal; The voltage control end is electrically connected with the output end of the slow start operational amplifier; The differential output is electrically connected to a pair of control ports of the semiconductor refrigerator.
4. The slow start circuit of claim 1, further comprising: The output end of the digital-analog converter is electrically connected with the second fixed end of the second switch, and the digital-analog converter is used for controlling the controlled object to reach the target temperature at a specific speed by adjusting the step of the analog output voltage of the output end and the step speed.
5. A method of warm-up of a thermostat in a warm-up circuit as claimed in any one of claims 1 to 4, comprising: a negative feedback PID loop is built by using a temperature detection unit, a power drive, a semiconductor refrigerator, a plurality of analog switches, a resistance-capacitance network and a mild starting operational amplifier; The controller is used for controlling the opening and closing of the plurality of analog switches and the disabling or enabling of the power driving, so that the temperature controller can finish zero-current starting at various initial temperatures, and the pressure of the concurrent current demand of the power supply of the system is relieved to the greatest extent.
6. The method of claim 5, wherein controlling, by a controller, the opening and closing of the plurality of analog switches and the disabling or enabling of the power drive comprises: After the temperature controller is electrified, power driving is forbidden through the controller, meanwhile, the knife end of the first switch is controlled to be electrically connected with the second fixed end of the temperature controller, the knife end of the second switch is controlled to be electrically connected with the first fixed end of the temperature controller, the knife end of the third switch is electrically connected with the second fixed end of the temperature controller, and the knife end of the fourth switch is electrically connected with the fixed end of the temperature controller, so that V OUT1 =V OUT1_init =V REF /2 * (1+R F /R NTC -R F /R C ) and V OUT2 =V OUT2_init are realized, wherein V OUT1 is the output voltage of the detection operational amplifier, V OUT2 is the output voltage of the slow-start operational amplifier, R F is a feedback resistor, R NTC is a thermistor, R C is a compensation resistor, V OUT1_init is the initial voltage of the detection operational amplifier, and V OUT2_init is the initial voltage of the slow-start operational amplifier; Charging the integrating capacitor to a set time or monitoring the voltage at two ends of the integrating capacitor to a set threshold value, controlling the knife end of the first switch to be electrically connected with the first fixed end of the integrating capacitor, the knife end of the second switch to be electrically connected with the second fixed end of the integrating capacitor, the knife end of the third switch to be electrically connected with the first fixed end of the third switch, and the knife end of the fourth switch to be electrically disconnected with the fixed end of the fourth switch, so that V TSET =V OUT1_init and V OUT2 =V TSET +V CI =V OUT1_init +V OUT2_init -V OUT1_init =V OUT2_init are achieved, wherein V TSET is the set voltage; The controller enables power driving to enable V OUT2 =V OUT2_init , at the moment, the voltage and the current at the two ends of the semiconductor refrigerator are both 0, and cold start is completed.
7. The method of claim 6, wherein the resistance value of the thermistor is determined by the initial temperature Tinit of the controlled object and is denoted as R NTC_init , and the initial voltage of V OUT1 is denoted as V OUT1_init , i.e., V OUT 1=V OUT1_init , when the knife end of the first switch is controlled to be electrically connected to the second stationary end thereof, the knife end of the second switch is controlled to be electrically connected to the first stationary end thereof, the knife end of the third switch is controlled to be electrically connected to the second stationary end thereof, and the knife end of the fourth switch is controlled to be electrically connected to the stationary end thereof.
8. The method of claim 6, wherein after the system cold start is completed, the output terminal of the digital-to-analog converter is electrically connected to the second stationary terminal of the second switch, and the controlled object is controlled to reach the target temperature at a specific speed by adjusting the step and pace of the analog output voltage at the output terminal thereof.

Description

Temperature controller slow start circuit and method Technical Field The invention relates to the technical field of integrated circuit design, in particular to a temperature controller slow start circuit and a temperature controller slow start method. Background When the controlled target reaches the specified temperature by using the temperature controller, a closed-loop PID control system is generally used. In order to make a laser at a constant operating temperature in the application fields such as an optical module, an optical amplifier, a laser gas sensor and the like used in an optical communication system, a temperature controller is generally used for driving a semiconductor refrigerator (TEC) to realize a constant temperature condition of the laser. A temperature controller based on a semiconductor refrigerator (TEC) is generally composed of a semiconductor refrigerator (TEC), a thermistor (NTC), a power DRIVER (DRIVER), and a control circuit (PID). They constitute a negative feedback system, the thermistor can measure the current temperature V OUT1 of the controlled target, the temperature setting value of the controlled target is V TSET, the difference value of the temperature setting value is regulated by the control circuit (PID), and then the output V OUT2, VOUT2 controls the power Drive (DRIVER) to drive the semiconductor refrigerator (TEC) to heat or refrigerate the target, so that the temperature V OUT1 of the controlled target gradually approaches and finally equals to the temperature setting value V TSET. Because the environment temperature of the controlled target is unpredictable and the change is possibly larger (such as difference between spring, summer, autumn and winter and latitude) and the temperature setting target is different, the temperature controller can generate larger refrigeration or heating current at the starting moment, the impact is caused on the power supply of the product, and the system stability is possibly deteriorated and even the system cannot work normally. The system block diagram of the prior temperature controller based on the semiconductor refrigerator is shown in fig. 1, and a negative feedback PID loop (hereinafter referred to as analog PID) is formed by an operational amplifier and a resistor and a capacitor to realize constant temperature control. The transfer function of the output voltage V TEC and the input voltage V OUT2 of the power driving module is assumed to be V TEC =5(V OUT2_init - VOUT2) for discussion purposes we assume that V OUT2_init is equal to 1.25V, the transfer function is V TEC =5(1.25V-V OUT2) the output voltage V TEC of the power driving module is related to the input voltage V OUT2 as shown in fig. 2. When the V OUT2 is equal to 1.25V in system start-up, the start-up voltage V TEC of the TEC is 0V, and the start-up current I TEC of the TEC is 0. When the system is powered on and started, the electronic devices such as an operational amplifier, a capacitor and the like exist in the analog PID, the circuit starting moment V OUT2 can be other voltage values except 1.25V due to the randomness of the initial temperature and the set temperature of the operational amplifier, the capacitor and the controlled target, the power driving module can generate very large refrigeration or heating current on the TEC, and the fact that I TEC is too large can exceed the maximum limiting current of the power supply VDD of the system, so that the power supply voltage of the system is collapsed. Based on the technical background, the invention provides a temperature controller slow start circuit and a temperature controller slow start method. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a temperature controller slow start circuit and a temperature controller slow start method, and the slow start circuit can accurately and rapidly realize zero current start of a simulated PID temperature control system at various initial temperatures, thereby reducing the pressure of concurrent current demands of a power supply of the system to the greatest extent. In order to achieve the above object, a first aspect of the present invention provides a temperature controller slow start circuit, including: A plurality of analog switches including a first switch, a second switch, a third switch, and a fourth switch; a resistive-capacitive network comprising a plurality of resistors and a plurality of capacitors; The non-inverting input end of the slow start operational amplifier is electrically connected with one end of one resistor of the plurality of resistors and one end of the third switch, and the output end of the slow start operational amplifier is electrically connected with the voltage control end driven by the power, one stationary end of the third switch and one end of two capacitors of the plurality of capacitors; And the controller is used for controlling the opening and closing of the plurality of analog switches