A C-band radar transmitter modulation power supply

Abstract

The present invention relates to the technical field of radar transmitter modulated power supply, and provides a C-band radar transmitter modulated power supply, comprising a power supply device, the power supply device comprising at least one modulation module, the modulation module comprising an input power module, a preprocessing module, a modulation module, a detection module, a feedback module and an execution module. The present invention obtains the power value of the radar transmitter, modulates the input power signal with the power value of the radar transmitter, and provides a feedback control signal based on the power value of the radar transmitter and the first output obtained by the frequency detector and the second output obtained by the pulse width detector to reduce or increase the pulse frequency corresponding to the first output and the pulse width corresponding to the second output through a control chip arranged in a microprocessor, and uses the pulse frequency corresponding to the first output and the pulse width corresponding to the second output as a reference to judge whether to perform a PFM modulation mode of low-load operation or a PWM modulation mode of heavy-load operation.

Description

Technical Field

[0001] The invention relates to the technical field of radar transmitter modulation power supply, in particular to a C-band radar transmitter modulation power supply. Background Art

[0002] The current and voltage of the power supply to the radar transmitter are completely different at different powers. Generally speaking, the increase in power requires a larger current and / or voltage to operate the radar transmitter. The traditional method of modulating the power supply of the radar transmitter is generally implemented through an amplifier circuit. Since the use of an amplifier circuit often cannot form a continuous transition during the continuous operation of the radar transmitter, modulation jitter often occurs. Summary of the invention

[0003] In view of this, the main purpose of the present invention is to provide a C-band radar transmitter modulation power supply.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A C-band radar transmitter modulation power supply, comprising:

[0006] A power supply device, the power supply device comprising at least one modulation module, the modulation module comprising:

[0007] An input power module, used to input a power signal according to a set power;

[0008] A preprocessing module, wherein the preprocessing module is configured to shape and correct the power supply signal to form a standard input signal;

[0009] A modulation module, wherein a modulation controller and a modulation circuit are provided in the modulation module; the modulation controller is configured to determine a modulation mode according to power feedback of the radar transmitter, wherein the modulation mode includes a PFM modulation mode for low-load operation and a PWM modulation mode for heavy-load operation;

[0010] A detection module, the detection module includes a frequency detector and a pulse width detector, the frequency detector is configured to: filter the power signal and the standard input signal through a low-pass filter and compare the pulse frequency between the two to form a first output; the pulse width detector is configured to: filter the power signal and the standard input signal through a low-pass filter and compare the pulse width between the two to form a second output;

[0011] A feedback module, the feedback module at least comprising a microprocessor and a communication loop, one end of the communication loop is connected to a transmitter controller in the radar transmitter, and the other end is connected to the microprocessor, the microprocessor communicates with the transmitter controller in real time through the communication loop to obtain the power value of the radar transmitter;

[0012] An execution module is connected to the feedback module, the detection module and the modulation module. The execution module is configured to provide a feedback control signal based on the power value of the radar transmitter and the first output obtained by the frequency detector and the second output obtained by the pulse width detector to reduce or increase the pulse frequency corresponding to the first output and the pulse width corresponding to the second output through a control chip provided in the microprocessor, and to use the pulse frequency corresponding to the first output and the pulse width corresponding to the second output as a reference to determine whether to perform a PFM modulation mode for low-load operation or a PWM modulation mode for heavy-load operation.

[0013] Further, the modulation circuit includes a DC / DC converter, a PFM modulation unit and a PWM modulation unit;

[0014] When the execution module uses the pulse frequency corresponding to the first output and the pulse width corresponding to the second output as a reference, it first compares with the preset standard pulse frequency and standard pulse width. When the first comparison value between the pulse width corresponding to the second output and the standard pulse width is within the first setting range and the second comparison value between the pulse frequency corresponding to the first output and the standard pulse frequency exceeds the second setting range, the PWM modulation unit is turned on through the DC / DC converter to run the PWM modulation mode; when the first comparison value between the pulse width corresponding to the second output and the standard pulse width is lower than the first setting range and the second comparison value between the pulse frequency corresponding to the first output and the standard pulse frequency is lower than the second setting range, the PFM modulation unit is turned on through the DC / DC converter to run the PFM modulation mode.

[0015] Furthermore, the PFM modulation unit and the PWM modulation unit are connected to a radar transmitter.

[0016] Furthermore, a PFC controller in a continuous current conduction mode is provided in the preprocessing module, a programmable program for shaping and correction is embedded in the PFC controller, the programmable program uses the PFC controller as a carrier, and the programmable program has a first area and a second area, a shaping logic program for adjusting the slope of an inner ramp signal in a power supply signal is provided in the first area, and a coefficient for correction and a correction logic program are written in the second area.

[0017] Furthermore, an error signal amplifier is also provided in the PFC controller.

[0018] Furthermore, the detection module includes a first comparator for performing real-time comparison with the first output of the frequency detector and a second comparator for performing real-time comparison with the second output of the pulse width detector; wherein a feedback control signal is formed by the microprocessor based on a first comparison result of the first comparator and a second comparison result of the second comparator.

[0019] Further, the first comparator is used to perform pulse frequency simulation on the first output first and then load a first comparison table for comparison, so as to check the pulse frequency range corresponding to the first output;

[0020] The second comparator is used to perform pulse width simulation on the second output first and then load a second comparison table for comparison to check the pulse width range corresponding to the second output.

[0021] Furthermore, the first comparison table has a plurality of frequency ranges which are arranged continuously and are used to represent the span of the pulse frequency interval.

[0022] Furthermore, the second comparison table has a plurality of consecutively set width ranges for representing pulse width interval spans.

[0023] The present invention obtains the power value of the radar transmitter and modulates the input power signal with the power value of the radar transmitter. At the same time, before modulation, the power signal is shaped and corrected by a preprocessing module to form a standard input signal. The power signal and the standard input signal are filtered by a low-pass filter and the pulse frequency between the two is compared to form a first output; the power signal and the standard input signal are filtered by a low-pass filter and the pulse width between the two is used as a second output. Based on the power value of the radar transmitter and the first output obtained by the frequency detector and the second output obtained by the pulse width detector, a feedback control signal is provided to reduce or increase the pulse frequency corresponding to the first output and the pulse width corresponding to the second output through a control chip set in a microprocessor. The pulse frequency corresponding to the first output and the pulse width corresponding to the second output are used as a reference to determine whether to perform a PFM modulation mode of low-load operation or a PWM modulation mode of heavy-load operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following drawings are only used to illustrate and explain the present invention, and are not used to limit the scope of the present invention, wherein:

[0025] Figure 1 It is a schematic diagram of the framework principle of the present invention;

[0026] Figure 2 This is a circuit diagram of an embodiment of the slope modulation of the inner ramp of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution, design method and advantages of the present invention clearer, the present invention is further described in detail by specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Reference Figure 1 The present invention provides a C-band radar transmitter modulation power supply, comprising:

[0029] A power supply device, the power supply device comprising at least one modulation module, the modulation module comprising:

[0030] An input power module, used to input a power signal according to a set power;

[0031] A preprocessing module, wherein the preprocessing module is configured to shape and correct the power supply signal to form a standard input signal;

[0032] A modulation module, wherein a modulation controller and a modulation circuit are provided in the modulation module; the modulation controller is configured to determine a modulation mode according to power feedback of the radar transmitter, wherein the modulation mode includes a PFM modulation mode for low-load operation and a PWM modulation mode for heavy-load operation;

[0033] A detection module, the detection module includes a frequency detector and a pulse width detector, the frequency detector is configured to: filter the power signal and the standard input signal through a low-pass filter and compare the pulse frequency between the two to form a first output; the pulse width detector is configured to: filter the power signal and the standard input signal through a low-pass filter and compare the pulse width between the two to form a second output;

[0034] A feedback module, the feedback module at least comprising a microprocessor and a communication loop, one end of the communication loop is connected to a transmitter controller in the radar transmitter, and the other end is connected to the microprocessor, the microprocessor communicates with the transmitter controller in real time through the communication loop to obtain the power value of the radar transmitter;

[0035] An execution module is connected to the feedback module, the detection module and the modulation module. The execution module is configured to provide a feedback control signal based on the power value of the radar transmitter and the first output obtained by the frequency detector and the second output obtained by the pulse width detector to reduce or increase the pulse frequency corresponding to the first output and the pulse width corresponding to the second output through a control chip provided in the microprocessor, and to use the pulse frequency corresponding to the first output and the pulse width corresponding to the second output as a reference to determine whether to perform a PFM modulation mode for low-load operation or a PWM modulation mode for heavy-load operation.

[0036] Further, the modulation circuit includes a DC / DC converter, a PFM modulation unit and a PWM modulation unit;

[0037] When the execution module uses the pulse frequency corresponding to the first output and the pulse width corresponding to the second output as a reference, it first compares with the preset standard pulse frequency and standard pulse width. When the first comparison value between the pulse width corresponding to the second output and the standard pulse width is within the first setting range and the second comparison value between the pulse frequency corresponding to the first output and the standard pulse frequency exceeds the second setting range, the PWM modulation unit is turned on through the DC / DC converter to run the PWM modulation mode; when the first comparison value between the pulse width corresponding to the second output and the standard pulse width is lower than the first setting range and the second comparison value between the pulse frequency corresponding to the first output and the standard pulse frequency is lower than the second setting range, the PFM modulation unit is turned on through the DC / DC converter to run the PFM modulation mode.

[0038] Furthermore, the PFM modulation unit and the PWM modulation unit are connected to a radar transmitter.

[0039] In the above, the PWM modulation mode is fixed frequency and width modulation, that is, the switching frequency is kept constant, and the purpose of modulation is achieved by changing the duty cycle of the driving signal in each cycle. When the output voltage changes, the duty cycle of the driving signal will change through the control of the loop, thereby maintaining the constant output voltage. And the PWM modulation unit is the core of the PWM modulation mode, and its control circuit is simple, easy to design and implement, with small output ripple voltage and good frequency characteristics. PWM is a digital signal from the microprocessor to the controlled system, and then the digital-to-analog conversion is performed to minimize the impact of noise.

[0040] In the above, the PFM modulation mode is fixed frequency and fixed width, and the frequency and width of the driving signal remain constant. However, when the load is the heaviest, the driving signal works at full frequency. When the load becomes lighter, the driving signal will skip some switching cycles. During the skipped cycles, the switching power tube remains in the off state. When the load changes, the system is adjusted and controlled by changing the number of times the skipping cycle occurs.

[0041] Furthermore, a PFC controller in a continuous current conduction mode is provided in the preprocessing module, a programmable program for shaping and correction is embedded in the PFC controller, the programmable program uses the PFC controller as a carrier, and the programmable program has a first area and a second area, a shaping logic program for adjusting the slope of an inner ramp signal in a power supply signal is provided in the first area, and a coefficient for correction and a correction logic program are written in the second area.

[0042] Furthermore, an error signal amplifier is also provided in the PFC controller.

[0043] In the above, input current shaping is a control method of continuous current conduction mode, which is different from the traditional / typical average current mode PFC controller. This method does not require the configuration of input voltage information and multipliers. It changes the slope of the internal ramp according to the output voltage of the error amplifier, and the current sensing information and the ramp signal are used to determine the turn-on time. Figure 2 As shown in , the PFC switch is turned on when the inner ramp signal reaches the set value. To control the output voltage, the PFC controller adjusts the slope of the inner ramp signal. If the slope increases, the average current increases; if the slope decreases, the average current decreases. With the continuous mode characteristic, the inductor current is proportional to the sine wave at turn-on. Therefore, the minimum inductor current in one switching cycle varies with the sinusoidal current reference. Of course, the peak value of the inductor current in one switching cycle is not controlled according to the sinusoidal reference. Therefore, the average inductor current may not be a sinusoidal wave. In order to make the average inductor current close to the sinusoidal reference, there must be a high enough inductance to reduce the current ripple.

[0044] Furthermore, the detection module includes a first comparator for performing real-time comparison with the first output of the frequency detector and a second comparator for performing real-time comparison with the second output of the pulse width detector; wherein a feedback control signal is formed by the microprocessor based on a first comparison result of the first comparator and a second comparison result of the second comparator.

[0045] Further, the first comparator is used to perform pulse frequency simulation on the first output first and then load a first comparison table for comparison, so as to check the pulse frequency range corresponding to the first output;

[0046] The second comparator is used to perform pulse width simulation on the second output first and then load a second comparison table for comparison to check the pulse width range corresponding to the second output.

[0047] Furthermore, the first comparison table has a plurality of frequency ranges which are arranged continuously and are used to represent the span of the pulse frequency interval.

[0048] Furthermore, the second comparison table has a plurality of consecutively set width ranges for representing pulse width interval spans.

[0049] The present invention obtains the power value of the radar transmitter and modulates the input power signal with the power value of the radar transmitter. At the same time, before modulation, the power signal is shaped and corrected by a preprocessing module to form a standard input signal. The power signal and the standard input signal are filtered by a low-pass filter and the pulse frequency between the two is compared to form a first output; the power signal and the standard input signal are filtered by a low-pass filter and the pulse width between the two is used as a second output. Based on the power value of the radar transmitter and the first output obtained by the frequency detector and the second output obtained by the pulse width detector, a feedback control signal is provided to reduce or increase the pulse frequency corresponding to the first output and the pulse width corresponding to the second output through a control chip set in a microprocessor. The pulse frequency corresponding to the first output and the pulse width corresponding to the second output are used as a reference to determine whether to perform a PFM modulation mode of low-load operation or a PWM modulation mode of heavy-load operation.

[0050] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A C-band radar transmitter modulated power supply, characterized in that: include: A power supply device, the power supply device comprising at least one modulation module, the modulation module comprising: An input power module, used to input a power signal according to a set power; A preprocessing module, wherein the preprocessing module is configured to shape and correct the power supply signal to form a standard input signal; A modulation module, wherein a modulation controller and a modulation circuit are provided in the modulation module; the modulation controller is configured to determine a modulation mode according to power feedback of a radar transmitter, wherein the modulation mode includes a PFM modulation mode for low-load operation and a PWM modulation mode for heavy-load operation; the PFM modulation mode has a fixed frequency and a fixed width, and the frequency and width of the driving signal are kept constant; when the load is the heaviest, the driving signal operates at full frequency, and when the load becomes lighter, the driving signal skips a number of switching cycles, and the switching power tube is kept in an off state during the skipped cycles; A detection module, the detection module includes a frequency detector and a pulse width detector, the frequency detector is configured to: filter the power signal and the standard input signal through a low-pass filter and compare the pulse frequency between the two to form a first output; the pulse width detector is configured to: filter the power signal and the standard input signal through a low-pass filter and compare the pulse width between the two to form a second output; A feedback module, the feedback module at least comprising a microprocessor and a communication loop, one end of the communication loop is connected to a transmitter controller in the radar transmitter, and the other end is connected to the microprocessor, the microprocessor communicates with the transmitter controller in real time through the communication loop to obtain the power value of the radar transmitter; An execution module is connected to the feedback module, the detection module and the modulation module. The execution module is configured to provide a feedback control signal based on the power value of the radar transmitter and the first output obtained by the frequency detector and the second output obtained by the pulse width detector to reduce or increase the pulse frequency corresponding to the first output and the pulse width corresponding to the second output through a control chip provided in the microprocessor, and to use the pulse frequency corresponding to the first output and the pulse width corresponding to the second output as a reference to determine whether to perform a PFM modulation mode for low-load operation or a PWM modulation mode for heavy-load operation.

2. The C-band radar transmitter modulation power supply according to claim 1, characterized in that: The modulation circuit includes a DC / DC converter, a PFM modulation unit and a PWM modulation unit; When the execution module uses the pulse frequency corresponding to the first output and the pulse width corresponding to the second output as a reference, it first compares with the preset standard pulse frequency and standard pulse width. When the first comparison value between the pulse width corresponding to the second output and the standard pulse width is within the first setting range and the second comparison value between the pulse frequency corresponding to the first output and the standard pulse frequency exceeds the second setting range, the PWM modulation unit is turned on through the DC / DC converter to run the PWM modulation mode; when the first comparison value between the pulse width corresponding to the second output and the standard pulse width is lower than the first setting range and the second comparison value between the pulse frequency corresponding to the first output and the standard pulse frequency is lower than the second setting range, the PFM modulation unit is turned on through the DC / DC converter to run the PFM modulation mode.

3. The C-band radar transmitter modulation power supply according to claim 2, characterized in that: The PFM modulation unit and the PWM modulation unit are connected to a radar transmitter.

4. The C-band radar transmitter modulation power supply according to claim 1, characterized in that: The preprocessing module is provided with a PFC controller in a continuous current conduction mode, and a programmable program for shaping and correction is embedded in the PFC controller. The programmable program uses the PFC controller as a carrier, and the programmable program has a first area and a second area. The first area is provided with a shaping logic program for adjusting the slope of an inner ramp signal in a power supply signal, and the second area is written with coefficients for correction and a correction logic program.

5. The C-band radar transmitter modulation power supply according to claim 4, characterized in that: The PFC controller is also provided with an error signal amplifier.

6. The C-band radar transmitter modulation power supply according to claim 1, characterized in that: The detection module includes a first comparator for performing real-time comparison with the first output of the frequency detector and a second comparator for performing real-time comparison with the second output of the pulse width detector; wherein a feedback control signal is formed by the microprocessor based on a first comparison result of the first comparator and a second comparison result of the second comparator.

7. The C-band radar transmitter modulation power supply according to claim 6, characterized in that: The first comparator is used to perform pulse frequency simulation on the first output and then load a first comparison table for comparison to check the pulse frequency range corresponding to the first output; The second comparator is used to perform pulse width simulation on the second output first and then load a second comparison table for comparison to check the pulse width range corresponding to the second output.

8. The C-band radar transmitter modulation power supply according to claim 7, characterized in that: The first comparison table has a plurality of frequency ranges which are arranged consecutively and are used to represent the span of the pulse frequency interval.

9. The C-band radar transmitter modulation power supply according to claim 7, characterized in that: The second comparison table has a plurality of consecutively arranged width ranges for representing pulse width interval spans.

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