Power supply module for PCR instrument and PCR instrument

Abstract

The invention discloses a power supply module for a PCR instrument and the PCR instrument, and relates to the technical field of biological detection equipment. A DC-DC unit is connected with a full-bridge driving unit and supplies power to the full-bridge driving unit; the full-bridge driving unit is respectively connected with the power supply control unit and a refrigeration sheet of the PCR instrument, and is used for supplying power to the refrigeration sheet according to a load control signal from the power supply control unit; the power supply control unit is used for sampling an electric signal for supplying power to the full-bridge driving unit by the DC-DC unit, generating a reference electric signal according to an electric signal control strategy on the basis of a sampling result, and outputting the reference electric signal to the adjustable electric signal control unit; the adjustable electric signal control unit is used for comparing a power supply signal of the refrigeration sheet with a reference electric signal output by the power supply control unit, generating a control signal and outputting the control signal to the DC-DC unit; and the DC-DC unit adjusts an electric signal for supplying power to the full-bridge driving unit according to the received control signal. By the adoption of the scheme, the requirement for supplying power to the refrigeration sheet in a changing mode can be met rapidly.

Description

Technical Field

[0001] The present application relates to the technical field of biological detection equipment and the technical field of PCR (polymerase chain reaction) instrument, and in particular to a power supply module for a PCR instrument and a PCR instrument. Background Art

[0002] PCR technology is a technology that uses polymerase chain reaction to amplify organisms. In addition to relying on related biological reagents, the core of this technology is the variable temperature control platform required for PCR biological reactions. The characteristics of this variable temperature control module are: a large temperature control range (from 4℃-100℃), fast temperature control speed (≥2℃ / s), and high power requirements (usually several hundred watts). To achieve the above temperature control performance, a matching power module is needed.

[0003] The commonly used temperature control method currently uses semiconductor refrigeration technology. The control of semiconductor refrigerators is usually a single control method, that is, one of the constant voltage control, constant current control or constant load drive methods. However, semiconductor refrigerators of different specifications and different combinations of multiple semiconductor refrigerators require different power supply voltage and current requirements. Different power supply specifications lead to large differences in the temperature control rate of the semiconductor refrigerator, and its energy efficiency is uncontrollable. Unmatched power supplies will seriously affect the service life of the semiconductor refrigerator, and even directly burn the refrigerator.

[0004] In current practical applications, standard power supplies are all power supplies with relatively fixed specifications and parameters, and most of them have constant voltage output, which greatly limits the adaptation and selection of semiconductor refrigerators. Refrigerator plates of different specifications need to be matched with multiple power supplies, which also greatly increases their use cost. Summary of the invention

[0005] The embodiment of the present application provides a power module for a PCR instrument and a PCR instrument, so as to solve the problem in the prior art that the power module of the PCR instrument cannot be well adapted to the power supply demand of the refrigeration plate of the PCR instrument.

[0006] The embodiment of the present application provides a power supply module for a PCR instrument, comprising: a DC-DC unit, a full-bridge drive unit, an adjustable electrical signal control unit and a power supply control unit, wherein:

[0007] The DC-DC unit is connected to the full-bridge drive unit to supply power to the full-bridge drive unit;

[0008] The full-bridge driving unit is respectively connected to the power control unit and the cooling plate of the PCR instrument as a load, and is used to supply power to the cooling plate according to the load control signal from the power control unit;

[0009] The power control unit samples the electrical signal supplied by the DC-DC unit to the full-bridge drive unit, generates a reference electrical signal according to the electrical signal control strategy based on the sampling result, and outputs the reference electrical signal to the adjustable electrical signal control unit;

[0010] The adjustable electrical signal control unit is used to compare the power supply signal of the cooling plate with the reference electrical signal output by the power control unit, generate a control signal, and output the control signal to the DC-DC unit;

[0011] The DC-DC unit adjusts the electrical signal for supplying power to the full-bridge driving unit according to the received control signal.

[0012] Further, the adjustable electrical signal control unit includes: an adjustable voltage control unit;

[0013] The power control unit samples the voltage supplied by the DC-DC unit to the full-bridge drive unit, generates a first reference voltage according to a voltage control strategy based on the obtained first sampled voltage, and outputs the first reference voltage to the adjustable voltage control unit;

[0014] The adjustable voltage control unit is used to compare the power supply voltage of the full-bridge drive unit with the first reference voltage output by the power control unit, generate a voltage control signal, and output the voltage control signal to the DC-DC unit;

[0015] The DC-DC unit adjusts the voltage supplied to the full-bridge driving unit according to the received voltage control signal.

[0016] Furthermore, the DC-DC unit includes: a PWM controller voltage loop and a MOS tube;

[0017] The PWM controller voltage loop is used to adjust the duty cycle of the internal PWM pulse signal according to the received voltage control signal;

[0018] The PWM pulse signal is used to drive the MOS tube, and the on-time of the MOS tube is controlled by adjusting the duty cycle of the PWM pulse signal, thereby adjusting the voltage supplied to the full-bridge drive unit.

[0019] Further, the adjustable voltage control unit includes: a first differential proportional amplifier circuit;

[0020] The first differential proportional amplifier circuit is used to perform differential proportional amplification on the power supply voltage of the full-bridge drive unit and the first reference voltage output by the power control unit, and output a first error signal as a voltage control signal.

[0021] Further, the power control unit includes: a first AD sampling circuit, a power control subunit and a first DA conversion circuit;

[0022] The first AD sampling circuit is used to sample the analog voltage signal supplied by the DC-DC unit to the full-bridge driving unit to obtain a first sampled voltage;

[0023] The power control subunit is used to generate a first reference voltage digital signal according to a voltage control strategy based on the obtained first sampled voltage;

[0024] The first DA conversion circuit is used to convert the first reference voltage digital signal into an analog signal as a first reference voltage.

[0025] Further, the adjustable electrical signal control unit includes: an adjustable current control unit;

[0026] The power module further comprises: a load current sampling resistor connected to the low end of the full-bridge driving unit;

[0027] The power control unit samples the voltage of the load current sampling resistor to obtain a second sampling voltage, generates a second reference voltage according to a current control strategy based on the second sampling voltage, and outputs the second reference voltage to the adjustable current control unit;

[0028] The adjustable current control unit is used to compare the voltage of the load current sampling resistor with the second reference voltage output by the power control unit, generate a current control signal, and output the current control signal to the DC-DC unit;

[0029] The DC-DC unit adjusts the current supplied to the full-bridge driving unit according to the received current control signal.

[0030] Further, the DC-DC unit includes a PWM controller current loop;

[0031] The PWM controller current loop is used to adjust the duty cycle of the internal PWM pulse signal according to the received current control signal, so as to adjust the current supplied to the full-bridge drive unit.

[0032] Further, the adjustable current control unit includes: a second differential proportional amplifier circuit;

[0033] The second differential proportional amplifier circuit is used to perform differential proportional amplification on the voltage of the load current sampling resistor and the second reference voltage output by the power control unit, and output a second error signal as a current control signal.

[0034] Further, the power control unit includes: a second AD sampling circuit, a power control subunit and a second DA conversion circuit;

[0035] The second AD sampling circuit is used to sample the voltage of the load current sampling resistor to obtain a second sampling voltage;

[0036] The power control subunit is used to generate a second reference voltage digital signal according to a current control strategy based on the second sampled voltage;

[0037] The second DA conversion circuit is used to convert the second reference voltage digital signal into an analog signal as a second reference voltage.

[0038] The present application also provides a PCR instrument, comprising:

[0039] The power module and cooling plate as described in any of the above items.

[0040] The beneficial effects of this application include:

[0041] The power supply module for a PCR instrument provided in an embodiment of the present application includes: a DC-DC unit, a full-bridge drive unit, an adjustable electrical signal control unit and a power control unit, wherein the DC-DC unit is connected to the full-bridge drive unit to supply power to the full-bridge drive unit; the full-bridge drive unit is respectively connected to the power control unit and a cooling plate of the PCR instrument as a load, and is used to supply power to the cooling plate according to a load control signal from the power control unit; the power control unit samples the electrical signal supplied by the DC-DC unit to the full-bridge drive unit, and generates a reference electrical signal according to an electrical signal control strategy based on the sampling result, and outputs the reference electrical signal to the adjustable electrical signal control unit; the adjustable electrical signal control unit is used to compare the power supply signal of the cooling plate with the reference electrical signal output by the power control unit, generate a control signal, and output the control signal to the DC-DC unit; the DC-DC unit adjusts the electrical signal supplied to the full-bridge drive unit according to the received control signal. The power module is used to power the cooling plate of the PCR instrument. When the cooling plate of the PCR instrument changes and the corresponding power supply demand changes, it is only necessary to change the electrical signal control strategy of the power control unit, and generate a reference electrical signal that meets the power supply demand according to the changed electrical signal control strategy. That is, the electrical signal of the DC-DC unit supplying power to the full-bridge drive unit can be adjusted through the adjustable electrical signal control unit. Compared with the prior art, there is no need to use a new power module to replace the original power module. It is only necessary to change the electrical signal control strategy of the power control unit to quickly adapt to the changed demand for powering the cooling plate.

[0042] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0044] Figure 1 A schematic diagram of the structure of a power supply module for a PCR instrument provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0046] Figure 3 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0047] Figure 4 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0048] Figure 5 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0049] Figure 6 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0050] Figure 7 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0051] Figure 8 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0052] Fig. 9 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0053] Fig.10 A schematic diagram of the structure of a power supply module for a PCR instrument provided in another embodiment of the present application;

[0054] Fig.11 A schematic diagram of the structure of the PCR instrument provided in the embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to provide a solution for quickly adapting the power supply requirements of the refrigeration plate of the PCR instrument, the embodiment of the present application provides a power module and a PCR instrument for the PCR instrument. The preferred embodiments of the present application are described below in conjunction with the drawings of the specification. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In addition, the embodiments in the present application and the features in the embodiments can be combined with each other if there is no conflict.

[0056] The present application embodiment provides a power supply module for a PCR instrument, such as Figure 1 As shown, it includes: a DC-DC unit 1, a full-bridge drive unit 2, an adjustable electrical signal control unit 3 and a power control unit 4, wherein:

[0057] The DC-DC unit 1 is connected to the full-bridge drive unit 2 to supply power to the full-bridge drive unit 2;

[0058] The full-bridge driving unit 2 is respectively connected to the power control unit 3 and the cooling plate 5 of the PCR instrument as a load, and is used to supply power to the cooling plate 5 according to the load control signal from the power control unit 4;

[0059] The power control unit 4 samples the electrical signal supplied by the DC-DC unit 1 to the full-bridge drive unit 2, generates a reference electrical signal according to the electrical signal control strategy based on the sampling result, and outputs the reference electrical signal to the adjustable electrical signal control unit 3;

[0060] The adjustable electric signal control unit 3 is used to compare the power supply signal of the cooling plate 5 with the reference electric signal output by the power control unit 4, generate a control signal, and output the control signal to the DC-DC unit 1;

[0061] The DC-DC unit 1 adjusts the electric signal supplied to the full-bridge driving unit 2 according to the received control signal.

[0062] By adopting the power module for PCR instrument provided in the embodiment of the present application, when the refrigeration plate of the PCR instrument changes and the corresponding power supply demand changes, it is only necessary to change the electrical signal control strategy of the power control unit, and generate a reference electrical signal that meets the power supply demand according to the changed electrical signal control strategy. That is, the electrical signal of the DC-DC unit supplying power to the full-bridge drive unit can be adjusted by the adjustable electrical signal control unit. Compared with the prior art, there is no need to use a new power module to replace the original power module. It is only necessary to change the electrical signal control strategy of the power control unit to quickly adapt to the changed demand for power supply to the refrigeration plate, thereby improving the ability to adapt to the power supply demand of the refrigeration plate of the PCR instrument.

[0063] In one embodiment of the present application, Figure 2As shown, the adjustable electrical signal control unit 3 may include: an adjustable voltage control unit 31;

[0064] The power control unit 4 samples the voltage supplied by the DC-DC unit 1 to the full-bridge driving unit 2, generates a first reference voltage according to a voltage control strategy based on the obtained first sampled voltage, and outputs the first reference voltage to the adjustable voltage control unit 31;

[0065] The adjustable voltage control unit 31 is used to compare the power supply voltage of the full-bridge driving unit 2 with the first reference voltage output by the power control unit 4, generate a voltage control signal, and output the voltage control signal to the DC-DC unit 1;

[0066] The DC-DC unit 1 adjusts the voltage supplied to the full-bridge driving unit 2 according to the received voltage control signal.

[0067] Further, such as Figure 3 As shown, the DC-DC unit 1 may include: a PWM (pulse width modulation) controller voltage loop 11 and a MOS tube 12;

[0068] The PWM controller voltage loop 11 is used to adjust the duty cycle of the internal PWM pulse signal according to the received voltage control signal;

[0069] The PWM pulse signal is used to drive the MOS tube 12 , so as to adjust the duty cycle of the PWM pulse signal to control the on-time of the MOS tube, thereby adjusting the voltage supplied to the full-bridge driving unit 2 .

[0070] Further, such as Figure 4 As shown, the adjustable voltage control unit 31 may include: a first differential proportional amplifier circuit 311;

[0071] The first differential proportional amplifier circuit 311 is used for performing differential proportional amplification on the power supply voltage of the full-bridge driving unit 2 and the first reference voltage output by the power control unit 4, and outputting a first error signal as a voltage control signal.

[0072] Further, such as Figure 5 As shown, the power control unit 4 may include: a first AD (Analog-to-Digital, analog-to-digital conversion) sampling circuit 41, a power control subunit 42 and a first DA (Digital-to-Analog) conversion circuit 43;

[0073] A first AD sampling circuit 41 is used to sample the analog voltage signal supplied by the DC-DC unit 1 to the full-bridge driving unit 2 to obtain a first sampling voltage;

[0074] The power control subunit 42 is used to generate a first reference voltage digital signal according to a voltage control strategy based on the obtained first sampled voltage;

[0075] The first DA conversion circuit 43 is used to convert the first reference voltage digital signal into an analog signal as the first reference voltage.

[0076] Above Figure 2-Figure 5 The specific structures of the adjustable electrical signal control unit 3, the DC-DC unit 1, the adjustable voltage control unit 31 and the power control unit 4 shown can be arbitrarily combined and implemented in the power module at the same time.

[0077] In one embodiment of the present application, Figure 6 As shown, the adjustable electrical signal control unit 3 may include: an adjustable current control unit 32;

[0078] The power module may further include: a load current sampling resistor 6 connected to the low end of the full-bridge driving unit 2;

[0079] The power control unit 4 samples the voltage of the load current sampling resistor 6 to obtain a second sampling voltage, generates a second reference voltage according to the current control strategy based on the second sampling voltage, and outputs the second reference voltage to the adjustable current control unit 32;

[0080] The adjustable current control unit 32 is used to compare the voltage of the load current sampling resistor with the second reference voltage output by the power control unit 4, generate a current control signal, and output the current control signal to the DC-DC unit 1;

[0081] The DC-DC unit 1 adjusts the current supplied to the full-bridge driving unit 2 according to the received current control signal.

[0082] Further, such as Figure 7 As shown, the DC-DC unit 1 may include a PWM controller current loop 13;

[0083] The PWM controller current loop 13 is used to adjust the duty cycle of the internal PWM pulse signal according to the received current control signal, so as to adjust the current supplied to the full-bridge drive unit 2.

[0084] Further, such as Figure 8 As shown, the adjustable current control unit 32 includes: a second differential proportional amplifier circuit 321;

[0085] The second differential proportional amplifier circuit 321 is used for performing differential proportional amplification on the voltage of the load current sampling resistor and the second reference voltage output by the power control unit, and outputting a second error signal as a current control signal.

[0086] Further, such as Fig. 9 As shown, the power control unit 4 may include: a second AD sampling circuit 44, a power control subunit 45 and a second DA conversion circuit 46;

[0087] A second AD sampling circuit 44 is used to sample the voltage of the load current sampling resistor to obtain a second sampling voltage;

[0088] The power control subunit 45 is used to generate a second reference voltage digital signal according to a current control strategy based on the second sampled voltage;

[0089] The second DA conversion circuit 46 is used to convert the second reference voltage digital signal into an analog signal as the second reference voltage.

[0090] In the present application embodiment, the above Figure 6-Figure 9 The specific structures of the adjustable electrical signal control unit 3, the DC-DC unit 1, the adjustable current control unit 32 and the power control unit 4 shown can be arbitrarily combined and implemented in the power module at the same time.

[0091] and, Figure 6-Figure 9 The structure shown, Figure 2-Figure 5 The structures shown in the figure can be arbitrarily combined and implemented in the power module at the same time. For example, Fig.10 The power module shown.

[0092] In the embodiment of the present application, the power control unit 4 may include the above Figure 5 and Fig. 9 The structure shown in Figure 5 The power control subunit 42 and Fig. 9 The power control subunit 45 in can be the same power control subunit.

[0093] In one embodiment of the present application, the cooling plate 5 may be a semiconductor cooling plate.

[0094] By using the power supply module for the PCR instrument provided in the embodiment of the present application, the voltage and current output by the DC-DC unit can be digitally adjusted, so that when the semiconductor refrigeration chip of the PCR instrument is replaced and the power supply demand of the semiconductor refrigeration chip changes, it can quickly adapt to the changed power supply demand, thereby improving the use efficiency of the PCR instrument.

[0095] In an embodiment of the present application, the power control unit sends a load control signal to the full-bridge drive unit, which is used to control the switching of the power supply current from the full-bridge drive unit to the refrigeration plate as the load, thereby satisfying the switching of the heating mode and the cooling mode of the refrigeration plate, and further realizing the rapid temperature change control requirements required for the PCR reaction.

[0096] In the embodiment of the present application, the power control unit can also make overvoltage and overcurrent judgments based on the sampling results of the voltage and current supplied by the DC-DC unit to the full-bridge drive unit, and when overvoltage or overcurrent occurs, correspondingly, the voltage and current supplied by the DC-DC unit to the full-bridge drive unit are controlled by adjusting the output first reference voltage and the second reference voltage, thereby achieving the purpose of overvoltage and overcurrent protection.

[0097] Furthermore, a temperature acquisition unit can be provided in the PCR instrument to sample the temperature of the PCR reaction, and the temperature of the power supply module can also be sampled. Based on the temperature sampling results, the power supply control unit can control the voltage and current supplied by the DC-DC unit to the full-bridge drive unit, thereby achieving the purpose of over-temperature protection.

[0098] In the embodiment of the present application, the power control unit may be a single chip microcomputer. Figure 5 The first DA conversion circuit shown in FIG. Fig. 9 The second DA conversion circuit shown in the figure can be implemented by using the DA conversion function of the microcontroller, or by setting a dedicated DAC chip in the power control unit.

[0099] Based on the above power supply module provided in the embodiment of the present application, the embodiment of the present application also provides a PCR instrument, such as Fig.10 As shown, it includes any of the above power modules and a cooling plate.

[0100] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0101] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A power module for a PCR instrument, characterized in that: include: DC-DC unit, full-bridge drive unit, adjustable electrical signal control unit and power control unit, wherein: The DC-DC unit is connected to the full-bridge drive unit to supply power to the full-bridge drive unit; The full-bridge driving unit is respectively connected to the power control unit and the cooling plate of the PCR instrument as a load, and is used to supply power to the cooling plate according to the load control signal from the power control unit; The power control unit samples the electrical signal supplied by the DC-DC unit to the full-bridge drive unit, generates a reference electrical signal according to the electrical signal control strategy based on the sampling result, and outputs the reference electrical signal to the adjustable electrical signal control unit; The adjustable electrical signal control unit is used to compare the power supply signal of the cooling plate with the reference electrical signal output by the power control unit, generate a control signal, and output the control signal to the DC-DC unit; The DC-DC unit adjusts the electrical signal for supplying power to the full-bridge driving unit according to the received control signal.

2. The power module according to claim 1, characterized in that: The adjustable electrical signal control unit includes: an adjustable voltage control unit; The power control unit samples the voltage supplied by the DC-DC unit to the full-bridge drive unit, generates a first reference voltage according to a voltage control strategy based on the obtained first sampled voltage, and outputs the first reference voltage to the adjustable voltage control unit; The adjustable voltage control unit is used to compare the power supply voltage of the full-bridge drive unit with the first reference voltage output by the power control unit, generate a voltage control signal, and output the voltage control signal to the DC-DC unit; The DC-DC unit adjusts the voltage supplied to the full-bridge driving unit according to the received voltage control signal.

3. The power module according to claim 2, characterized in that: The DC-DC unit includes: a PWM controller voltage loop and a MOS tube; The PWM controller voltage loop is used to adjust the duty cycle of the internal PWM pulse signal according to the received voltage control signal; The PWM pulse signal is used to drive the MOS tube, and the on-time of the MOS tube is controlled by adjusting the duty cycle of the PWM pulse signal, thereby adjusting the voltage supplied to the full-bridge drive unit.

4. The power module according to claim 2, characterized in that: The adjustable voltage control unit comprises: a first differential proportional amplifier circuit; The first differential proportional amplifier circuit is used to perform differential proportional amplification on the power supply voltage of the full-bridge drive unit and the first reference voltage output by the power control unit, and output a first error signal as a voltage control signal.

5. The power module according to claim 2, characterized in that: The power control unit comprises: a first AD sampling circuit, a power control subunit and a first DA conversion circuit; The first AD sampling circuit is used to sample the analog voltage signal supplied by the DC-DC unit to the full-bridge driving unit to obtain a first sampled voltage; The power control subunit is used to generate a first reference voltage digital signal according to a voltage control strategy based on the obtained first sampled voltage; The first DA conversion circuit is used to convert the first reference voltage digital signal into an analog signal as a first reference voltage.

6. The power module according to any one of claims 1 to 5, characterized in that: The adjustable electrical signal control unit includes: an adjustable current control unit; The power module further comprises: a load current sampling resistor connected to the low end of the full-bridge driving unit; The power control unit samples the voltage of the load current sampling resistor to obtain a second sampling voltage, generates a second reference voltage according to a current control strategy based on the second sampling voltage, and outputs the second reference voltage to the adjustable current control unit; The adjustable current control unit is used to compare the voltage of the load current sampling resistor with the second reference voltage output by the power control unit, generate a current control signal, and output the current control signal to the DC-DC unit; The DC-DC unit adjusts the current supplied to the full-bridge driving unit according to the received current control signal.

7. The power module according to claim 6, characterized in that: The DC-DC unit includes a PWM controller current loop; The PWM controller current loop is used to adjust the duty cycle of the internal PWM pulse signal according to the received current control signal, so as to adjust the current supplied to the full-bridge drive unit.

8. The power module according to claim 6, characterized in that: The adjustable current control unit comprises: a second differential proportional amplifier circuit; The second differential proportional amplifier circuit is used to perform differential proportional amplification on the voltage of the load current sampling resistor and the second reference voltage output by the power control unit, and output a second error signal as a current control signal.

9. The power module according to claim 6, characterized in that: The power control unit comprises: a second AD sampling circuit, a power control subunit and a second DA conversion circuit; The second AD sampling circuit is used to sample the voltage of the load current sampling resistor to obtain a second sampling voltage; The power control subunit is used to generate a second reference voltage digital signal according to a current control strategy based on the second sampled voltage; The second DA conversion circuit is used to convert the second reference voltage digital signal into an analog signal as a second reference voltage.

10. A PCR instrument, characterized in that: include: A power module and a cooling plate as claimed in any one of claims 1 to 9.

Images