TEC control circuit and optical components

Abstract

The present invention discloses a TEC control circuit and an optical component. The TEC control circuit includes a temperature threshold setting circuit whose signal feedback end is connected to the output end of the optical component, the output end of the temperature threshold setting circuit is connected to the control end of the integral feedback circuit, the output end of the integral feedback circuit is connected to the input end of the TEC controller, the output end of the TEC controller is connected to the TEC in the optical component, and the threshold setting end of the temperature threshold setting circuit is connected to the inverting input end of the integral feedback circuit; the temperature threshold setting circuit is used to set the target temperature voltage value in the TEC control circuit to compare with the temperature feedback voltage value of the thermistor, and output a level signal to the integral feedback circuit; the integral feedback circuit is used to adjust the numerical range of the integral constant according to the on / off of its second integral circuit, and output an integral feedback signal to the TEC controller; the TEC controller outputs the corresponding TEC current to the TEC in the optical component. The present invention improves the reliability of the TEC control circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of optical signal detection, and in particular to a TEC control circuit and an optical component. Background Art

[0002] At present, the stability of the emission wavelength is very high in medium and long-distance high-speed optical components. Since the operating temperature of the optical component will affect the stability of the emission wavelength, a large number of TECs (semiconductor coolers) are used to control the temperature of the laser in the optical component to keep the emission wavelength of the laser in the optical component stable.

[0003] However, in the related art, if the TEC circuit needs to be stabilized quickly, the current will rise too quickly, resulting in a large overshoot, long-term oscillation, and a longer stabilization time; if the overshoot needs to be controlled so as not to cause long-term oscillation, the current rise will slow down, and the time it takes for the TEC circuit to stabilize will also be extended. Generally speaking, the laser will only be turned on after the TEC is stable, so if the TEC takes too long to stabilize, the laser will light up too late and cannot meet the application requirements. Summary of the invention

[0004] The main purpose of the present invention is to propose a TEC control circuit and an optical component, aiming to improve the reliability of the TEC control circuit by addressing the excessive surge current when the TEC control circuit in the optical component is started and the fast and stable TEC control circuit.

[0005] To achieve the above object, the TEC control circuit proposed in the present invention is applied to an optical component, wherein the optical component includes a TEC, a laser and a thermistor, and the TEC control circuit includes a temperature threshold setting circuit, an integral feedback circuit and a TEC controller;

[0006] The signal feedback end of the temperature threshold setting circuit is connected to the output end of the optical component, the output end of the temperature threshold setting circuit is connected to the control end of the integral feedback circuit, the output end of the integral feedback circuit is connected to the input end of the TEC controller, the output end of the TEC controller is connected to the TEC of the optical component, and the threshold setting end of the temperature threshold setting circuit is connected to the inverting input end of the integral feedback circuit;

[0007] The temperature threshold setting circuit is used to set the target temperature voltage value in the TEC control circuit, so as to compare the temperature feedback voltage value of the thermistor with the target temperature voltage value, and output a level signal to the integral feedback circuit;

[0008] The integral feedback circuit includes a first integral circuit and a second integral circuit, and is used to adjust the numerical range of the integral constant according to the on / off of the second integral circuit, and output an integral feedback signal to the TEC controller;

[0009] The TEC controller is used to output a corresponding TEC current to the TEC in the optical component according to the integral feedback signal output by the integral feedback circuit.

[0010] Optionally, the integral feedback circuit also includes a first comparator and a first switch, the non-inverting input terminal of the first comparator is the signal feedback terminal of the integral feedback circuit, the inverting input terminal of the first comparator, the first terminal of the first integral circuit and the first terminal of the second integral circuit are connected to each other, the output terminal of the first comparator, the second terminal of the first integral circuit and the second terminal of the first switch are connected, and the first terminal of the first switch is connected to the second terminal of the second integral circuit.

[0011] Optionally, the first integration circuit is an integration circuit with a small integration constant, and the range of the small integration constant is 0.01UF-0.1UF.

[0012] Optionally, the second integration circuit is an integration circuit with a large integration constant, and the range of the large integration constant is 1.0UF-10UF.

[0013] Optionally, the first switch is a single-pole single-throw switch.

[0014] Optionally, the temperature threshold setting circuit includes a second comparator, a third comparator, a first resistor, a second resistor and a third resistor;

[0015] The non-inverting input terminal of the second comparator is connected to the inverting input terminal of the third comparator and is the threshold setting terminal of the temperature threshold setting circuit. The inverting input terminal of the second comparator is connected to the non-inverting input terminal of the third comparator and is the signal feedback terminal of the temperature threshold setting circuit. The output terminal of the second comparator is connected to the first end of the first resistor. The output terminal of the third comparator is connected to the first end of the second resistor. The second end of the first resistor, the second end of the second resistor and the first end of the third resistor are connected to each other and are the output end of the temperature threshold setting circuit. The second end of the third resistor is grounded.

[0016] Optionally, the non-inverting input terminal of the second comparator is a heating variable integral setting threshold of a temperature threshold setting circuit, and a range of the heating variable integral setting threshold is less than 10% of the target temperature voltage value.

[0017] Optionally, the inverting input terminal of the third comparator is a refrigeration variable integral setting threshold of a temperature threshold setting circuit, and a range of the refrigeration variable integral setting threshold is greater than 10% of the target temperature voltage value.

[0018] Optionally, the value range of the first resistor, the second resistor and the third resistor is 10KΩ-100KΩ.

[0019] The present invention also provides an optical component, the optical component includes the TEC control circuit as described above; the TEC control circuit includes a temperature threshold setting circuit, an integral feedback circuit and a TEC controller;

[0020] The signal feedback end of the temperature threshold setting circuit is connected to the output end of the optical component, the output end of the temperature threshold setting circuit is connected to the control end of the integral feedback circuit, the output end of the integral feedback circuit is connected to the input end of the TEC controller, the output end of the TEC controller is connected to the TEC of the optical component, and the threshold setting end of the temperature threshold setting circuit is connected to the inverting input end of the integral feedback circuit;

[0021] The temperature threshold setting circuit is used to set the target temperature voltage value in the TEC control circuit, so as to compare the temperature feedback voltage value of the thermistor with the target temperature voltage value, and output a level signal to the integral feedback circuit;

[0022] The integral feedback circuit includes a first integral circuit and a second integral circuit, and is used to adjust the numerical range of the integral constant according to the on / off of the second integral circuit, and output an integral feedback signal to the TEC controller;

[0023] The TEC controller is used to output a corresponding TEC current to the TEC in the optical component according to the integral feedback signal output by the integral feedback circuit.

[0024] The technical solution of the present invention includes a temperature threshold setting circuit, an integral feedback circuit and a TEC controller in a TEC control circuit, wherein the signal feedback end of the temperature threshold setting circuit is connected to the output end of the optical component, the output end of the temperature threshold setting circuit is connected to the control end of the integral feedback circuit, the output end of the integral feedback circuit is connected to the input end of the TEC controller, the output end of the TEC controller is connected to the TEC in the optical component, and the threshold setting end of the temperature threshold setting circuit is connected to the inverting input end of the integral feedback circuit. Specifically, the temperature threshold setting circuit is used to set the target temperature voltage value in the TEC control circuit, and the temperature feedback voltage value of the thermistor is compared with the set target temperature voltage value to output a level signal to the integral feedback circuit; when the temperature feedback voltage value of the thermistor reaches the set target temperature voltage value, the temperature threshold setting circuit outputs a high level signal to control the second integral circuit in the integral feedback circuit to be connected, so that the integral constant of the integral feedback circuit increases instantly, the output control signal changes slowly, and the output current of the TEC controller slows down, which will not cause obvious current overshoot problems; the problem of excessive surge current when the TEC control circuit in the optical component is started is solved, and the reliability of the TEC control circuit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a circuit structure diagram of an embodiment of a conventional TEC control circuit;

[0027] Figure 2 It is a schematic diagram of the oscillation process of the TEC output current generated when the integral constant of the integral feedback circuit in the TEC control circuit is too small;

[0028] Figure 3 It is a schematic diagram of the slow change process of the TEC output current generated when the integral constant of the integral feedback circuit in the TEC control circuit is too large;

[0029] Figure 4 A schematic diagram of the circuit structure of an embodiment of a TEC control circuit of the present invention;

[0030] Figure 5 It is a schematic diagram of the change process of the TEC output current generated when the TEC control circuit of the present invention is working.

[0031] Description of Figure Numbers:

[0032] Label name Label name 10 Temperature Threshold Setting Circuit Q2 Second comparator 20 Integral feedback circuit Q3 The third comparator 30 TEC Controller K1 First switch 21 The first integrating circuit R1 First resistor 22 Second integrating circuit R2 Second resistor Q1 First comparator R3 The third resistor

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The present invention provides a TEC control circuit, which is applied to an optical component, wherein the optical component includes a TEC, a laser and a thermistor. Figure 1 As shown, a temperature setting unit is set to set the target temperature value, which is input into the integral feedback circuit simultaneously with the thermistor feedback voltage in the optical component to generate an integral feedback signal, which is input into the TEC controller. The TEC controller outputs a current to control the size and direction of the TEC cooling or heating current in the optical component.

[0037] Refer to Figure 2As shown in FIG. 1 , it is a schematic diagram of the oscillation process of the TEC output current generated when the integral constant of the integral feedback circuit in the TEC control circuit is too small. That is, when the integral constant of the integral feedback circuit is small, the cooling or heating current output by the TEC controller rises rapidly, and the temperature of the driving laser changes rapidly, so that the temperature of the laser continues to change in one direction after exceeding the target temperature voltage value of the laser. Since the setting of the equivalent integral constant of the integral circuit is small, the overshoot of the cooling or heating current output by the TEC controller is serious, so that the cooling or heating effect of the TEC will not change immediately, and there is a certain delay hysteresis. The temperature feedback voltage value of the thermistor will also have hysteresis, and will be input into the integral feedback circuit. Since the equivalent integral constant is too small, the size and change direction of the integral feedback signal output by the integral feedback circuit cannot be changed immediately, and the output current of the TEC controller continues to increase in one direction until the temperature feedback voltage value of the thermistor inside the optical component changes in direction, causing the size and direction of the output current of the TEC controller to change, so that the temperature change of the laser is reversed and approaches the target temperature value again. For the same reason mentioned above, the output current of the TEC controller drops again until the next direction flips, oscillating repeatedly, and after the continuous attenuation of the equivalent integral constant, the laser finally stabilizes near the target temperature value.

[0038] Refer to Figure 3 The figure shows the slow change process of the TEC output current generated when the integral constant of the integral feedback circuit in the TEC control circuit is too large. That is, when the integral constant of the integral feedback circuit is large, the output current of the TEC controller changes slowly and rises. The temperature feedback voltage value of the laser thermistor and the target temperature voltage value are input into the integral feedback circuit. Since the integral constant is large, the generated integral feedback signal changes slowly, and the current output by the TEC controller also changes slowly. Finally, the temperature of the laser slowly approaches the target temperature value and finally stabilizes near the target temperature value.

[0039] Based on the above-mentioned related technical solutions, in the current TEC control circuit, refer to Figure 1 As shown, a fixed integration circuit is used to calculate the input error of the TEC controller (the equivalent voltage value of the temperature feedback voltage value of the thermistor close to the laser in the optical component and the target temperature voltage value) to output a suitable current to drive the TEC to work. In this way, if the equivalent integration constant of the integration circuit is too small, refer to Figure 2As shown, the control signal generated by the input error of the TEC controller changes too dramatically, causing the cooling or heating current output to the TEC to change too much, causing the temperature of the laser in the optical component to change dramatically. At the same time, due to the excessive change in the cooling or heating current, a serious current overshoot problem will occur, causing the temperature of the laser to far exceed the target temperature control value. Because the equivalent integral constant of the integration circuit is too small, this current overshoot causes the oscillation process to take a long time to stop; if the equivalent integral constant of the integration circuit is too large, refer to Figure 3 As shown, the control signal change generated by the input error of the TEC controller is relatively mild, the cooling and heating current changes of the instantaneous output of the TEC controller are small, and the temperature of the laser in the optical component changes slowly, so that the temperature of the laser approaches the target temperature voltage value relatively mildly. Although the TEC controller will not cause current overshoot problems, it will prolong the stabilization time of the laser.

[0040] In order to solve the above problem, in one embodiment of the present invention, Figure 4 As shown, the TEC control circuit includes a temperature threshold setting circuit 10, an integral feedback circuit 20 and a TEC controller 30;

[0041] The signal feedback end of the temperature threshold setting circuit 10 is connected to the output end of the optical component, the output end of the temperature threshold setting circuit 10 is connected to the control end of the integral feedback circuit 20, the output end of the integral feedback circuit 20 is connected to the input end of the TEC controller 30, the output end of the TEC controller 30 is connected to the TEC of the optical component, and the threshold setting end of the temperature threshold setting circuit 10 is connected to the inverting input end of the integral feedback circuit 20;

[0042] The temperature threshold setting circuit 10 is used to set the target temperature voltage value in the TEC control circuit, so as to compare the temperature feedback voltage value of the thermistor with the target temperature voltage value, and output a level signal to the integral feedback circuit 20;

[0043] The integral feedback circuit 20 includes a first integral circuit 21 and a second integral circuit 22, and is used to adjust the numerical range of the integral constant according to the on / off of the second integral circuit 22, and output an integral feedback signal to the TEC controller 30;

[0044] The TEC controller 30 is used to output a corresponding TEC current to the TEC in the optical component according to the integral feedback signal output by the integral feedback circuit 20 .

[0045] In this embodiment, the temperature threshold setting circuit 10 sets the target temperature voltage value in the TEC control circuit at a specific time so that the temperature feedback voltage value of the thermistor in the optical component is compared with it, and outputs a high level signal or a low level signal to the integral feedback circuit 20 after comparison to control the output result of the integral feedback circuit 20.

[0046] Furthermore, when the temperature feedback voltage value of the thermistor does not reach the temperature feedback voltage value set in the temperature threshold setting circuit 10 (that is, when the temperature feedback voltage value of the thermistor does not reach the variable integral setting threshold of cooling or heating), the temperature threshold setting circuit 10 outputs a low-level signal to the integral feedback circuit 20, controls the first integral circuit 21 in the integral feedback circuit 20 to be connected, and the second integral circuit 22 to be disconnected, the integral feedback signal output by the integral feedback circuit 20 changes dramatically, and the current output by the TEC controller 30 rises rapidly, so that the TEC in the optical component quickly cools or heats. When the TEC rapidly cools or heats so that the temperature of the laser approaches the target temperature value, and the temperature feedback voltage value of the thermistor reaches the temperature feedback voltage value set in the temperature threshold setting circuit 10 (that is, when the temperature feedback voltage value of the thermistor reaches the variable integral setting threshold of cooling or heating), the temperature threshold setting circuit 10 outputs a high-level signal to the integral feedback circuit 20, and controls the first integral circuit 21 and the second integral circuit 22 in the integral feedback circuit 20 to be connected at the same time, so that the integral constant of the entire integral feedback circuit 20 becomes larger instantly, and the change of the output integral feedback signal slows down. The output current of the TEC controller 30 is shown in FIG. Figure 5 The change shown does not cause obvious current overshoot problems. This solution improves the reliability of the TEC control circuit in the optical component.

[0047] In this embodiment, in the initial state of TEC, the equivalent integral constant of the integral feedback circuit 20 is small, and the cooling or heating current output by the TEC controller 30 is large and changes dramatically, so that the TEC in the optical component can quickly cool or heat, so that the actual temperature of the laser can quickly approach the target temperature value; the error value between the temperature feedback voltage value of the thermistor of the laser and the target temperature voltage value is judged by the threshold of the temperature threshold setting circuit 10. When the actual temperature of the laser is close to the target temperature value, the equivalent integral constant of the integral feedback circuit 20 is increased at this time, so that the integral feedback signal output by it changes slowly, and the cooling or heating current output by the TEC controller 30 is reduced and changes slowly, so that the temperature change of the laser slows down, and the output current overshoot of the TEC controller 30 is not formed. The TEC slowly cools or heats, so that the actual temperature of the laser approaches the target temperature value, and then the laser of the optical component is turned on to emit light. Through the above scheme, the surge current is too large when the TEC control circuit in the optical component is started, and the TEC control circuit is fast and stable, thereby improving the reliability of the TEC control circuit.

[0048] It should be noted that in this solution, the laser can be set to be close to the target temperature value when it is within the range of ±10% of the target temperature value. The target temperature value can be set according to the actual application situation and is not limited here.

[0049] In the above embodiment, the first integration circuit 21 is an integration circuit with a small integration constant, and the range of the small integration constant is 0.01UF-0.1UF; the second integration circuit 22 is an integration circuit with a large integration constant, and the range of the large integration constant is 1.0UF-10UF. It can be understood that when the temperature feedback voltage value of the thermistor in the optical component does not reach the temperature feedback voltage value set in the temperature threshold setting circuit 10 (that is, when the temperature feedback voltage value of the thermistor does not reach the variable integral setting threshold of cooling or heating), the temperature threshold setting circuit 10 outputs a low-level signal to the integration feedback circuit 20, controls the integration circuit with a small integration constant in the integration feedback circuit 20 to be connected, and the integration circuit with a large integration constant to be disconnected, the integration feedback signal output by the integration feedback circuit 20 changes dramatically, and the current output by the TEC controller 30 rises rapidly, so that the TEC in the optical component quickly cools or heats. When the TEC rapidly cools or heats so that the temperature of the laser approaches the target temperature value, and the temperature feedback voltage value of the thermistor reaches the temperature feedback voltage value set in the temperature threshold setting circuit 10 (that is, when the temperature feedback voltage value of the thermistor reaches the variable integral setting threshold of cooling or heating), the temperature threshold setting circuit 10 outputs a high-level signal to the integral feedback circuit 20, and controls the integral circuit with a small integral constant and the integral circuit with a large integral constant in the integral feedback circuit 20 to be connected at the same time, so that the integral constant of the entire integral feedback circuit 20 becomes larger instantly, and the change of the output integral feedback signal slows down, and there will be no obvious current overshoot problem. It can be understood that the small integral constant can be 0.01UF, 0.05UF, 0.1UF, etc., which can quickly respond to the input changes of the integral feedback circuit 20; the large integral constant can be 1.0UF, 5.0UF, 10UF, etc., which can ease the input changes of the integral feedback circuit 20, and increase the damping coefficient by connecting components with large resistance values ​​in series, so that it is insensitive to small input errors, and it is easier for the entire feedback unit to enter a stable state.

[0050] The technical solution of the present invention includes a temperature threshold setting circuit 10, an integral feedback circuit 20 and a TEC controller 30 in a TEC control circuit, wherein the signal feedback end of the temperature threshold setting circuit 10 is connected to the output end of the optical component, the output end of the temperature threshold setting circuit 10 is connected to the control end of the integral feedback circuit 20, the output end of the integral feedback circuit 20 is connected to the input end of the TEC controller 30, the output end of the TEC controller 30 is connected to the TEC in the optical component, and the threshold setting end of the temperature threshold setting circuit 10 is connected to the inverting input end of the integral feedback circuit 20. Specifically, a temperature threshold setting circuit 10 is used to set a target temperature voltage value in the TEC control circuit, and a temperature feedback voltage value of the thermistor is compared with the set target temperature voltage value to output a level signal to the integral feedback circuit 20; when the temperature feedback voltage value of the thermistor reaches the set target temperature voltage value, the temperature threshold setting circuit 10 outputs a high level signal to control the second integral circuit 22 in the integral feedback circuit 20 to be connected, so that the integral constant of the integral feedback circuit 20 increases instantaneously, and the output control signal thereof changes slowly, and the output current of the TEC controller 30 becomes slow, which will not cause an obvious current overshoot problem; the problem of excessive surge current when the TEC control circuit in the optical component is started is solved, and the reliability of the TEC control circuit is improved.

[0051] In one embodiment, referring to Figure 4 As shown, the integral feedback circuit 20 also includes a first comparator Q1 and a first switch K1, the non-inverting input terminal of the first comparator Q1 is the signal feedback terminal of the integral feedback circuit 20, the inverting input terminal of the first comparator Q1, the first terminal of the first integral circuit 21 and the first terminal of the second integral circuit 22 are connected to each other, the output terminal of the first comparator Q1, the second terminal of the first integral circuit 21 and the second terminal of the first switch K1 are connected, and the first terminal of the first switch K1 is connected to the second terminal of the second integral circuit 22.

[0052] In this embodiment, the first switch K1 is a single-pole single-throw switch, and may also be other switches for realizing line on and off, which is not limited here. It can be understood that when the temperature feedback voltage value of the thermistor does not reach the temperature feedback voltage value set in the temperature threshold setting circuit 10 (that is, when the temperature feedback voltage value of the thermistor does not reach the variable integral setting threshold of cooling or heating), the temperature threshold setting circuit 10 outputs a low-level signal to the integral feedback circuit 20, and at this time the single-pole single-throw switch is in an off state, and the first integral circuit 21 in the integral feedback circuit 20 is controlled to be connected, and the second integral circuit 22 is disconnected, and the integral feedback signal output by the integral feedback circuit 20 changes dramatically, and the current output by the TEC controller 30 rises rapidly, so that the TEC in the optical component quickly cools or heats. When the TEC rapidly cools or heats so that the temperature of the laser approaches the target temperature value, and the temperature feedback voltage value of the thermistor reaches the temperature feedback voltage value set in the temperature threshold setting circuit 10 (that is, when the temperature feedback voltage value of the thermistor reaches the variable integral setting threshold of cooling or heating), the temperature threshold setting circuit 10 outputs a high-level signal to the integral feedback circuit 20. At this time, the single-pole single-throw switch is in the on state, and the first integral circuit 21 and the second integral circuit 22 in the integral feedback circuit 20 are controlled to be connected at the same time, so that the integral constant of the entire integral feedback circuit 20 becomes larger instantly, and the change of the output integral feedback signal slows down. The output current of the TEC controller 30 is shown in FIG. Figure 5 The change shown does not cause obvious current overshoot problems. This solution improves the reliability of the TEC control circuit in the optical component.

[0053] In one embodiment, referring to Figure 4 As shown, the temperature threshold setting circuit 10 includes a second comparator Q2, a third comparator Q3, a first resistor R1, a second resistor R2 and a third resistor R3;

[0054] The non-inverting input terminal of the second comparator Q2 is connected to the inverting input terminal of the third comparator Q3, and is the threshold setting terminal of the temperature threshold setting circuit 10; the inverting input terminal of the second comparator Q2 is connected to the non-inverting input terminal of the third comparator Q3, and is the signal feedback terminal of the temperature threshold setting circuit 10; the output terminal of the second comparator Q2 is connected to the first end of the first resistor R1; the output terminal of the third comparator Q3 is connected to the first end of the second resistor R2; the second end of the first resistor R1, the second end of the second resistor R2 and the first end of the third resistor R3 are connected to each other, and are the output end of the temperature threshold setting circuit 10; and the second end of the third resistor R3 is grounded.

[0055] In this embodiment, the non-inverting input terminal of the second comparator Q2 is the heating variable integral setting threshold of the temperature threshold setting circuit 10, and the range of the heating variable integral setting threshold is less than 10% of the target temperature voltage value; the inverting input terminal of the third comparator Q3 is the cooling variable integral setting threshold of the temperature threshold setting circuit 10, and the range of the cooling variable integral setting threshold is greater than 10% of the target temperature voltage value. It can be understood that in this solution, the non-inverting input terminal of the second comparator Q2 can be the heating variable integral setting threshold, and the inverting input terminal of the third comparator Q3 can be the cooling variable integral setting threshold.

[0056] The first resistor R1, the second resistor R2 and the third resistor R3 all have a value range of 10KΩ-100KΩ. It is understandable that the resistance values ​​of the first resistor R1, the second resistor R2 and the third resistor R3 can all be 10KΩ, 50KΩ, 100KΩ, etc., which are selected according to the actual application environment and are not limited here.

[0057] Based on the above embodiment, the cooling process controlled by the TEC control circuit in the optical component is: when the optical component is started at a high temperature, since the temperature of the optical component is higher than the target temperature, the temperature feedback voltage of the thermistor is small and is input into the integral feedback circuit 20; since the temperature feedback voltage is less than the cooling variable integral setting threshold and the heating variable integral setting threshold, the second comparator Q2 outputs a high voltage, and the third comparator Q3 outputs a low voltage. After the voltage division processing of the first resistor R1, the second resistor R2, and the third resistor R3, the generated voltage division is less than the enabling closing voltage of the single-pole single-throw switch, and the single-pole single-throw switch is disconnected, and the entire integral feedback circuit 20 exhibits a small integral constant, and the TEC is in a fast cooling state. State; when the temperature of the optical component drops, the temperature feedback voltage of the thermistor increases. When this temperature feedback voltage is greater than the cooling variable integral setting threshold, the second comparator Q2 outputs a high voltage, and the third comparator Q3 outputs a high voltage. After the voltage division processing of the first resistor R1, the second resistor R2, and the third resistor R3, the generated divided voltage is greater than the enable closing voltage of the single-pole single-throw switch, and the single-pole single-throw switch is closed. The entire integral feedback circuit 20 exhibits a large integral constant, and the TEC enters a slow cooling state. Since the TEC current overshoot problem will not be formed, the temperature feedback voltage will always be less than the heating variable integral setting threshold. Finally, the temperature feedback voltage is stable, and the TEC is in a stable cooling state.

[0058] The heating process controlled by the TEC control circuit in the optical component is: when the optical component is started at a low temperature, since the temperature of the optical component is lower than the target temperature, the temperature feedback voltage value of the thermistor is too large and is input into the integral feedback circuit 20; since the temperature feedback voltage value is greater than the cooling variable integral setting threshold and the heating variable integral setting threshold, the second comparator Q2 outputs a low voltage, and the third comparator Q3 outputs a high voltage. After the voltage division processing of the first resistor R1, the second resistor R2, and the third resistor R3, the generated voltage division is less than the enabling closing voltage of the single-pole single-throw switch, and the single-pole single-throw switch is disconnected, and the entire integral feedback circuit 20 shows a small integral constant, and the TEC is in a rapid heating state; when The temperature of the optical component rises, and the temperature feedback voltage value of the thermistor decreases. When this temperature feedback voltage value is less than the heating variable integral setting threshold, the second comparator Q2 outputs a high voltage, and the third comparator Q3 outputs a high voltage. After the voltage division processing of the first resistor R1, the second resistor R2, and the third resistor R3, the generated divided voltage is greater than the enable closing voltage of the single-pole single-throw switch, and the single-pole single-throw switch is closed. The entire integral feedback circuit 20 exhibits a large integral constant, and the TEC enters a slow heating state. Since the TEC current overshoot problem will not occur, the temperature feedback voltage will always be greater than the cooling variable integral setting threshold. Finally, the temperature feedback voltage is stable, and the TEC is in a stable heating state.

[0059] The present invention further provides an optical component, the optical component comprising the TEC control circuit as described above; the TEC control circuit comprises a temperature threshold setting circuit 10, an integral feedback circuit 20 and a TEC controller 30;

[0060] The signal feedback end of the temperature threshold setting circuit 10 is connected to the output end of the optical component, the output end of the temperature threshold setting circuit 10 is connected to the control end of the integral feedback circuit 20, the output end of the integral feedback circuit 20 is connected to the input end of the TEC controller 30, the output end of the TEC controller 30 is connected to the TEC of the optical component, and the threshold setting end of the temperature threshold setting circuit 10 is connected to the inverting input end of the integral feedback circuit 20;

[0061] The temperature threshold setting circuit 10 is used to set the target temperature voltage value in the TEC control circuit, so as to compare the temperature feedback voltage value of the thermistor with the target temperature voltage value, and output a level signal to the integral feedback circuit 20;

[0062] The integral feedback circuit 20 includes a first integral circuit 21 and a second integral circuit 22, and is used to adjust the numerical range of the integral constant according to the on / off of the second integral circuit 22, and output an integral feedback signal to the TEC controller 30;

[0063] The TEC controller 30 is used to output a corresponding TEC current to the TEC in the optical component according to the integral feedback signal output by the integral feedback circuit 20 .

[0064] The specific structure of the TEC control circuit refers to the above embodiments. Since the optical component adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0065] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, under the scheme of the present invention are included in the patent protection scope of the present invention.

Claims

1. A TEC control circuit, applied to an optical component, wherein the optical component includes a TEC, a laser and a thermistor, characterized in that: The TEC control circuit includes a temperature threshold setting circuit, an integral feedback circuit and a TEC controller; The signal feedback end of the temperature threshold setting circuit is connected to the output end of the optical component, the output end of the temperature threshold setting circuit is connected to the control end of the integral feedback circuit, the output end of the integral feedback circuit is connected to the input end of the TEC controller, the output end of the TEC controller is connected to the TEC of the optical component, and the threshold setting end of the temperature threshold setting circuit is connected to the inverting input end of the integral feedback circuit; The temperature threshold setting circuit is used to set the target temperature voltage value in the TEC control circuit, so as to compare the temperature feedback voltage value of the thermistor with the target temperature voltage value, and output a level signal to the integral feedback circuit; The integral feedback circuit includes a first integral circuit and a second integral circuit, and is used to adjust the numerical range of the integral constant according to the on / off of the second integral circuit, and output an integral feedback signal to the TEC controller; The TEC controller is used to output a corresponding TEC current to the TEC in the optical component according to the integral feedback signal output by the integral feedback circuit; The integral feedback circuit further includes a first comparator and a first switch, wherein the non-inverting input terminal of the first comparator is a signal feedback terminal of the integral feedback circuit, the inverting input terminal of the first comparator, the first terminal of the first integral circuit and the first terminal of the second integral circuit are connected to each other, the output terminal of the first comparator, the second terminal of the first integral circuit and the second terminal of the first switch are connected, and the first terminal of the first switch is connected to the second terminal of the second integral circuit; The temperature threshold setting circuit includes a second comparator, a third comparator, a first resistor, a second resistor and a third resistor; The non-inverting input terminal of the second comparator is connected to the inverting input terminal of the third comparator and is the threshold setting terminal of the temperature threshold setting circuit. The inverting input terminal of the second comparator is connected to the non-inverting input terminal of the third comparator and is the signal feedback terminal of the temperature threshold setting circuit. The output terminal of the second comparator is connected to the first end of the first resistor. The output terminal of the third comparator is connected to the first end of the second resistor. The second end of the first resistor, the second end of the second resistor and the first end of the third resistor are connected to each other and are the output end of the temperature threshold setting circuit. The second end of the third resistor is grounded.

2. The TEC control circuit according to claim 1, characterized in that: The first integration circuit is an integration circuit with a small integration constant, and the range of the small integration constant is 0.01UF-0.1UF.

3. The TEC control circuit according to claim 1, characterized in that: The second integration circuit is an integration circuit with a large integration constant, and the range of the large integration constant is 1.0UF-10UF.

4. The TEC control circuit according to claim 1, characterized in that: The first switch is a single-pole single-throw switch.

5. The TEC control circuit according to claim 1, characterized in that: The non-inverting input terminal of the second comparator is the heating variable integral setting threshold of the temperature threshold setting circuit, and the range of the heating variable integral setting threshold is less than 10% of the target temperature voltage value.

6. The TEC control circuit according to claim 1, characterized in that: The inverting input terminal of the third comparator is the refrigeration variable integral setting threshold of the temperature threshold setting circuit, and the range of the refrigeration variable integral setting threshold is greater than 10% of the target temperature voltage value.

7. The TEC control circuit according to claim 1, characterized in that: The value ranges of the first resistor, the second resistor and the third resistor are all 10KΩ-100KΩ.

8. An optical component, characterized in that: The optical component comprises the TEC control circuit according to any one of claims 1 to 7.

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