Temperature control method, radio frequency circuit and electronic equipment

Abstract

The invention discloses a temperature control method, a radio frequency circuit and electronic equipment. The temperature control method is applied to the radio frequency circuit, a transmitting link of the radio frequency circuit comprises at least two final-stage power amplifiers, and an output port of each of the at least two final-stage power amplifiers is provided with a temperature detection point. The temperature control method comprises the following steps: acquiring a temperature value of a temperature detection point of an output port of each final-stage power amplifier; and when the temperature value of any temperature detection point is greater than a temperature threshold value, adjusting the power consumption of the final-stage power amplifier corresponding to the temperature detection point so as to control the temperature of the final-stage power amplifier. According to the scheme provided by the invention, the temperature of the final-stage multi-power amplifier can be fully protected, meanwhile, the final-stage output power is not greatly influenced, and the product use experience feeling of customers is kept on the premise of improving the reliability of the product power amplifier.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency technology, and in particular to a temperature control method, a radio frequency circuit and an electronic device. Background Art

[0002] A power amplifier is referred to as a "PA" and refers to an amplifier that can generate maximum power output to drive a certain load under given distortion conditions. As the power design requirements of communication products become higher and higher, the performance and consistency requirements of power amplifier devices are becoming more and more stringent. At present, in the transmission link, the temperature control of the power amplifier has a huge impact on the final output power and affects the user experience. Summary of the invention

[0003] In order to solve the technical problem that the temperature control of the power amplifier in the existing transmission link has a huge impact on the final stage output power and affects the user experience, the embodiments of the present invention provide a temperature control method, a radio frequency circuit and an electronic device.

[0004] The technical solution of the embodiment of the present invention is achieved as follows:

[0005] An embodiment of the present invention provides a temperature control method, which is applied to a radio frequency circuit, wherein a transmission chain of the radio frequency circuit includes at least two final-stage power amplifiers, and an output port of each of the at least two final-stage power amplifiers is provided with a temperature detection point. The temperature control method includes: collecting the temperature value of the temperature detection point of the output port of each final-stage power amplifier; when the temperature value of any temperature detection point is greater than a temperature threshold, adjusting the power consumption of the final-stage power amplifier corresponding to the temperature detection point to control the temperature of the final-stage power amplifier.

[0006] In one embodiment, adjusting the power consumption of the final-stage power amplifier corresponding to the temperature detection point includes: reducing the static operating current of the final-stage power amplifier corresponding to the temperature detection point.

[0007] In one embodiment, after lowering the static operating current of the final-stage power amplifier corresponding to the temperature detection point, if the temperature value of the temperature detection point is still greater than the temperature threshold, the temperature control method further includes: lowering the input power of each final-stage power amplifier.

[0008] An embodiment of the present invention also provides a radio frequency circuit, which includes a transmission link, a control circuit and at least two temperature detection circuits. The end of the transmission link includes at least two final-stage power amplifiers, each of the output ports of the final-stage power amplifier is provided with a temperature detection point, and each of the temperature detection points is provided with a temperature detection circuit; each of the temperature detection circuits is used to collect the temperature value of the temperature detection point of the output port of the corresponding final-stage power amplifier; the control circuit is used to adjust the power consumption of the final-stage power amplifier corresponding to the temperature detection point when the temperature value of any temperature detection point is greater than a temperature threshold, so as to control the temperature of the final-stage power amplifier.

[0009] In one embodiment, the control circuit includes a signal conversion circuit and a pre-power amplifier connected in sequence, the signal conversion circuit is respectively connected to each of the temperature detection circuits and each of the final-stage power amplifiers, and the pre-power amplifier is respectively connected to each of the final-stage power amplifiers; the signal conversion circuit is used to generate a current control signal when the temperature value of any of the temperature detection points is greater than a temperature threshold, so as to reduce the static operating current of the final-stage power amplifier corresponding to the temperature detection point through the current control signal, so as to adjust the power consumption of the final-stage power amplifier.

[0010] In one embodiment, after reducing the static operating current of the power amplifier corresponding to the temperature value, the signal conversion circuit is also used to generate a power control signal when the temperature value of the temperature detection point is still greater than the temperature threshold, and the pre-power amplifier reduces the input power of each of the final power amplifiers according to the power control signal.

[0011] In one embodiment, the pre-power amplifier includes a multi-stage power amplifier cascaded in sequence, each stage of the multi-stage power amplifier is connected to the signal conversion circuit, and the last stage of the multi-stage power amplifier is respectively connected to each of the final stage power amplifiers.

[0012] In one embodiment, the signal conversion circuit includes an analog-to-digital converter and a digital-to-analog converter, the analog-to-digital converter is respectively connected to the digital-to-analog converter and each of the temperature detection circuits, and the digital-to-analog converter is respectively connected to each stage of the multi-stage power amplifier and each of the final stage power amplifiers.

[0013] In one embodiment, the temperature detection circuit includes a thermistor, and the thermistor is arranged at the temperature detection point.

[0014] An embodiment of the present invention further provides an electronic device, comprising any of the above-mentioned radio frequency circuits.

[0015] The temperature control method, radio frequency circuit and electronic device provided by the embodiment of the present invention, the transmission link of the radio frequency circuit includes at least two final-stage power amplifiers, and the output port of each of the at least two final-stage power amplifiers is provided with a temperature detection point, and the temperature control method includes: collecting the temperature value of the temperature detection point of the output port of each final-stage power amplifier; when the temperature value of any temperature detection point is greater than the temperature threshold, adjusting the power consumption of the final-stage power amplifier corresponding to the temperature detection point to control the temperature of the final-stage power amplifier. The solution provided by the present invention can fully protect the temperature of the final-stage multi-power amplifier without causing a huge impact on the final-stage output power, and maintain the customer's product experience under the premise of improving the reliability of the product power amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the temperature control method according to an embodiment of the present invention;

[0017] Figure 2 It is a structural schematic diagram of a radio frequency circuit in the prior art;

[0018] Figure 3 It is a schematic diagram of the structure of the radio frequency circuit according to an embodiment of the present invention;

[0019] Figure 4 It is a structural schematic diagram of a temperature detection circuit according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of a radio frequency circuit in which the pre-power amplifier according to an embodiment of the present invention is a two-stage power amplifier;

[0021] Figure 6 Schematic diagram of the temperature control process of the embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0023] The embodiment of the present invention provides a temperature control method, which is applied to a radio frequency circuit, wherein the transmission chain of the radio frequency circuit includes at least two final-stage power amplifiers, and the output port of each of the at least two final-stage power amplifiers is provided with a temperature detection point, such as Figure 1 As shown, the temperature control method includes:

[0024] Step 101: collecting the temperature value of the temperature detection point of the output port of each final-stage power amplifier;

[0025] Step 102: When the temperature value of any temperature detection point is greater than the temperature threshold, the power consumption of the final-stage power amplifier corresponding to the temperature detection point is adjusted to control the temperature of the final-stage power amplifier.

[0026] Compared with the temperature control scheme of the existing power amplifier, the method of this embodiment can fully protect the final stage temperature without causing a significant impact on the final stage output power, thereby maintaining the customer's product experience while improving the reliability of the product power amplifier.

[0027] In this embodiment, the transmission link includes at least two final-stage power amplifiers, and the output port of each final-stage power amplifier is respectively provided with a corresponding temperature detection point. For example, when the transmission link includes two final-stage power amplifiers PA1 and PA2, the corresponding temperature detection points A1 and A2 are respectively provided at the output ports of the two final-stage power amplifiers PA1 and PA2. For another example, when the transmission link includes three final-stage power amplifiers PA1, PA2 and PA3, the corresponding temperature detection points A1, A2 and A3 are respectively provided at the output ports of the three final-stage power amplifiers PA1, PA2 and PA3.

[0028] In the following, this embodiment will be described in detail by taking an example where a transmission link includes two final-stage power amplifiers.

[0029] Specifically, see Figure 2 , Figure 2 The figure is a schematic diagram of the structure of the radio frequency circuit in the prior art. At present, the temperature protection scheme adopted by the prior art for the power amplifier is: a temperature detection point is set somewhere around the final power amplifier to detect the temperature of the final dual power amplifier. The temperature detection result is reported to the software, and the software sets the step value according to the temperature detection result, thereby controlling the automatic power control value, and then controlling the gate voltage of the driving stage PA, controlling the input power of the final dual power amplifier, thereby controlling the power amplifier power consumption and reducing the power amplifier temperature.

[0030] However, in the prior art, since the aging failure of the final-stage dual power amplifier is often only caused by one of the final-stage power amplifier tubes, the following problems will occur when the temperature control solution in the prior art is adopted: (1) The final-stage power amplifier temperature detection is not comprehensive, and one detection point cannot accurately detect the operating temperature of the final-stage power amplifier. (2) When the temperature protection function is running, the output power of the power amplifier link is significantly reduced, which will make the customer's product experience poor during long-distance calls.

[0031] Based on this, in this embodiment, a temperature detection point is set at each of the two final power amplifiers at the end, and each temperature detection point collects the temperature value of its own final power amplifier. The above method can accurately detect the operating temperature of each of the two final power amplifiers.

[0032] In addition, in this embodiment, when the temperature value of any temperature detection point is greater than the temperature threshold, when adjusting the power consumption of the final stage power amplifier corresponding to the temperature detection point, the static operating current of the final stage power amplifier corresponding to the temperature detection point can be reduced first.

[0033] In another implementation of this embodiment, if the temperature value of the temperature detection point is still greater than the temperature threshold after reducing the static operating current of the final stage power amplifier corresponding to the temperature detection point, the temperature control method in this embodiment also includes reducing the input power of each final stage power amplifier.

[0034] Since this embodiment adopts the method of reducing the static operating current of the power amplifier corresponding to the temperature value when the temperature value of a temperature detection point reaches the protection threshold, the temperature protection of a single power amplifier can be realized, and the impact on the final output power can be avoided while realizing the temperature protection. And compared with the solution in the prior art, when transmitting the same power, higher transmission efficiency can be achieved and the temperature of the final power amplifier can be lower.

[0035] The temperature control method provided by the embodiment of the present invention is applied to a radio frequency circuit, the transmission link of the radio frequency circuit includes at least two final power amplifiers, and the output port of each of the at least two final power amplifiers is provided with a temperature detection point, and the temperature control method includes: collecting the temperature value of the temperature detection point of the output port of each final power amplifier; when the temperature value of any temperature detection point is greater than the temperature threshold, adjusting the power consumption of the final power amplifier corresponding to the temperature detection point to control the temperature of the final power amplifier. The solution provided by the present invention can fully protect the temperature of the final dual power amplifier without causing a huge impact on the final output power, and maintain the customer's product experience under the premise of improving the reliability of the product power amplifier.

[0036] The embodiment of the present invention further provides a radio frequency circuit, see Figure 3 The radio frequency circuit includes a transmission link 301, a control circuit 302 and at least two temperature detection circuits 303. The end of the transmission link 301 includes at least two final power amplifiers, wherein: Figure 3 Only the case where the end of the transmission chain 301 includes two final-stage power amplifiers (final-stage PA1 and final-stage PA2) is shown, and each output port of the final-stage power amplifier is provided with a temperature detection point, and each temperature detection point is provided with a temperature detection circuit 303; each temperature detection circuit 303 is used to collect the temperature value of the temperature detection point of the output port of the corresponding final-stage power amplifier.

[0037] The control circuit 302 is used to adjust the power consumption of the final-stage power amplifier corresponding to any temperature detection point when the temperature value of any temperature detection point is greater than the temperature threshold, so as to control the temperature of the final-stage power amplifier.

[0038] Further, see Figure 3 In one embodiment, the control circuit 302 may include a signal conversion circuit T and a pre-power amplifier (driver stage PA) connected in sequence, the signal conversion circuit T is respectively connected to each temperature detection circuit 303 and each final stage PA, and the driver stage PA is respectively connected to each final stage PA.

[0039] The signal conversion circuit T is used to generate a current control signal (current control signal 1, current control signal 2) when the temperature value of any temperature detection point is greater than the temperature threshold, so as to reduce the static operating current of the final stage PA corresponding to the temperature detection point through the current control signal to adjust the power consumption of the final stage PA.

[0040] Here, the signal conversion circuit T may specifically include an analog-to-digital converter ADC and a digital-to-analog converter DAC, the analog-to-digital converter ADC is respectively connected to the digital-to-analog converter DAC and each of the temperature detection circuits 303, and the digital-to-analog converter DAC is respectively connected to each stage of the multi-stage power amplifier and each final stage PA;

[0041] Furthermore, in one embodiment, after reducing the static operating current of the power amplifier corresponding to the temperature value, the signal conversion circuit is also used to generate a power control signal when the temperature value of the temperature detection point is still greater than the temperature threshold, and the pre-power amplifier reduces the input power of each final power amplifier according to the power control signal.

[0042] Also, see Figure 4 , Figure 4 : is a schematic diagram of the structure of the temperature detection circuit 303 of the present embodiment. In one embodiment, the temperature detection circuit 303 includes a temperature-sensitive resistor RT, and the temperature-sensitive resistor RT is arranged at a temperature detection point. The temperature-sensitive resistor RT in the present embodiment can judge the temperature change according to the voltage division size. The temperature change will cause the resistance size to change, and the temperature value change can be determined according to the voltage value change after the voltage division of the temperature-sensitive resistor. Specifically, the temperature change at the temperature detection point causes the resistance of the temperature-sensitive resistor RT to change, so that the voltage outputted by the output terminal TX_TEMP of the temperature detection circuit 303 changes, and the voltage of the output terminal TX_TEMP is outputted to the control circuit 302, and the control circuit 302 can obtain the temperature value of the temperature detection point according to the voltage change.

[0043] Since this embodiment adopts the method of reducing the static operating current of the power amplifier corresponding to the temperature value when the temperature value of a temperature detection point reaches the protection threshold, the temperature protection of a single power amplifier can be realized, and the impact on the final output power can be avoided while realizing the temperature protection. And compared with the solution in the prior art, when transmitting the same power, higher transmission efficiency can be achieved and the temperature of the final power amplifier can be lower.

[0044] Furthermore, the pre-power amplifier in this embodiment may include a multi-stage power amplifier cascaded in sequence, each stage of the multi-stage power amplifier is connected to the signal conversion circuit, and the last stage of the multi-stage power amplifier is connected to each final stage power amplifier respectively.

[0045] See also Figure 5 , Figure 5 The schematic diagram of the structure of the pre-power amplifier includes a two-stage power amplifier. The pre-power amplifier includes a first-stage power amplifier (driving stage PA1) and a second-stage power amplifier (driving stage PA2) which are cascaded in sequence, the driving stage PA1 and the driving stage PA2 are both connected to the signal conversion circuit T, and the driving stage PA2 is also connected to the final stage PA1 and the final stage PA2 respectively.

[0046] Please continue to see Figure 3 , below, we will base on Figure 3 , further describes in detail the specific application of this embodiment in an actual scenario.

[0047] See also Figure 3 In this application embodiment, the transmitting link is a final-stage dual power amplifier (final-stage PA1 and final-stage PA2), and temperature detection points are set at the output ports of the final-stage dual power amplifier, and two static operating current control signals can be set: current control signal 1 (Final_bias1) and current control signal 2 (Final_bias2). Final_bias1 and Final_bias2 can be used to control the static operating current of the final stage PA1 and the final stage PA2 respectively. The temperature detection results of the two temperature detection points are reported to the software, and the software determines whether the detected temperature at one or two places reaches the protection threshold. If the temperature value at a certain place reaches the protection threshold, first reduce the current control signal (Final_bias1 or Final_bias2) corresponding to the temperature value at that place. If the temperature value still exceeds the protection threshold after the reduction, then reduce the automatic power control value (the automatic power control value can play the effect of reducing the input power of the final-stage dual power amplifier), so that the power amplifier power consumption is reduced, thereby achieving the purpose of reducing the temperature of the final-stage power amplifier.

[0048] When the temperature of the final dual power amplifier is unbalanced and the temperature of only one power amplifier reaches the protection threshold, the current control signal (Final_bias1 or Final_bias2) corresponding to the power amplifier is first reduced separately to reduce the static working current of the power amplifier, thereby reducing the power consumption of the power amplifier and realizing the temperature protection of the single power amplifier. Therefore, compared with the prior art, when transmitting the same power, the efficiency is higher and the temperature of the final power amplifier is lower.

[0049] Specifically, see Figure 6 , the temperature control process of the power amplifier in this embodiment can be:

[0050] The analog-to-digital converter obtains the temperature values ​​of two temperature detection points, and determines whether temperature 1 exceeds the protection threshold value (here, the protection threshold value can be 100°C) based on logical judgment. If temperature 1 exceeds 100°C, Final_bias1 is reduced. If Final_bias1 is 0 and temperature 1 exceeds 100°C, the automatic power control value is reduced. Determine whether temperature 2 exceeds the protection threshold value (here, the protection threshold value can be 100°C). If temperature 2 exceeds 100°C, Final_bias2 is reduced. If Final_bias2 is 0 and temperature 2 exceeds 100°C, the automatic power control value is reduced.

[0051] The method of this embodiment has the following beneficial effects:

[0052] (1) Through the temperature balance control method, the device consistency requirements for the final PA tube are reduced, thereby reducing material costs;

[0053] (2) Through the temperature balance control method, the risk of the last-stage single PA being burned out due to excessive temperature is reduced, thereby reducing the defective rate of the product;

[0054] (3) Through the temperature balance control method, the working temperature difference of the final dual PA is always kept within a certain range. When a single tube works abnormally, the abnormal impact will be shared by the two tubes, thereby extending the service life of the product;

[0055] (4) Through the temperature balance control method, there is no obvious difference in the customer's product experience before and after the temperature protection function is turned on.

[0056] Compared with the temperature control scheme of the existing power amplifier, the method of this embodiment can fully protect the final stage temperature without causing a significant impact on the final stage output power, thereby maintaining the customer's product experience while improving the reliability of the product power amplifier.

[0057] Based on the hardware implementation of the above program module and in order to implement the method of the embodiment of the present invention, the embodiment of the present invention further provides an electronic device, which includes any of the above radio frequency circuits. Specifically, in one embodiment, the electronic device may be a walkie-talkie.

[0058] Those skilled in the art will understand that Figure 3-5 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0059] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity 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, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0060] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A temperature control method, It is characterized in that Applied to a radio frequency circuit, the transmission chain of the radio frequency circuit includes at least two final-stage power amplifiers, and the output port of each of the at least two final-stage power amplifiers is provided with a temperature detection point, and the temperature control method includes: Collect the temperature value of the temperature detection point of the output port of each final-stage power amplifier; When the temperature value of any temperature detection point is greater than the temperature threshold, the power consumption of the final-stage power amplifier corresponding to the temperature detection point is adjusted to control the temperature of the final-stage power amplifier.

2. The temperature control method according to claim 1, It is characterized in that Adjusting the power consumption of the final stage power amplifier corresponding to the temperature detection point includes: The static operating current of the final-stage power amplifier corresponding to the temperature detection point is reduced.

3. The temperature control method according to claim 2, It is characterized in that After lowering the static operating current of the final-stage power amplifier corresponding to the temperature detection point, if the temperature value of the temperature detection point is still greater than the temperature threshold, the temperature control method further includes: Reduce the input power of each final power amplifier.

4. A radio frequency circuit, It is characterized in that The radio frequency circuit includes a transmission link, a control circuit and at least two temperature detection circuits. The end of the transmission link includes at least two final-stage power amplifiers. Each output port of the final-stage power amplifier is provided with a temperature detection point, and each temperature detection point is provided with one temperature detection circuit. Each of the temperature detection circuits is used to collect the temperature value of a temperature detection point of an output port of a corresponding final-stage power amplifier; The control circuit is used to adjust the power consumption of the final-stage power amplifier corresponding to any temperature detection point when the temperature value of any temperature detection point is greater than a temperature threshold, so as to control the temperature of the final-stage power amplifier.

5. The radio frequency circuit according to claim 4, It is characterized in that The control circuit comprises a signal conversion circuit and a pre-power amplifier connected in sequence, the signal conversion circuit is respectively connected to each of the temperature detection circuits and each of the final-stage power amplifiers, and the pre-power amplifier is respectively connected to each of the final-stage power amplifiers; The signal conversion circuit is used to generate a current control signal when the temperature value of any of the temperature detection points is greater than a temperature threshold, so as to reduce the static operating current of the final-stage power amplifier corresponding to the temperature detection point through the current control signal, so as to adjust the power consumption of the final-stage power amplifier.

6. The radio frequency circuit according to claim 5, It is characterized in that After reducing the static operating current of the power amplifier corresponding to the temperature value, the signal conversion circuit is also used to generate a power control signal when the temperature value at the temperature detection point is still greater than the temperature threshold, and the pre-power amplifier reduces the input power of each of the final power amplifiers according to the power control signal.

7. The radio frequency circuit according to claim 6, It is characterized in that The pre-power amplifier comprises a plurality of power amplifiers cascaded in sequence, each of which is connected to the signal conversion circuit, and the last power amplifier of which is connected to each of the final power amplifiers.

8. The radio frequency circuit according to claim 7, It is characterized in that The signal conversion circuit includes an analog-to-digital converter and a digital-to-analog converter. The analog-to-digital converter is respectively connected to the digital-to-analog converter and each of the temperature detection circuits. The digital-to-analog converter is respectively connected to each stage of the multi-stage power amplifier and each of the final stage power amplifiers.

9. The radio frequency circuit according to claim 4, It is characterized in that The temperature detection circuit includes a temperature-sensitive resistor, and the temperature-sensitive resistor is arranged at the temperature detection point.

10. An electronic device, It is characterized in that Comprising a radio frequency circuit as described in any one of claims 4 to 9.

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