Adaptive DC-DC boost converter device

Abstract

The present application discloses an adaptive DC-DC boost converter device and an electronic circuit. The device includes a circuit board having a plurality of electronic components mounted thereon, for implementing an adaptive DC-DC boost converter circuit and a boost decoupling capacitor. The adaptive DC-DC boost converter circuit includes: a DC-DC boost converter having a converter set value input, a boost power input, and a boost voltage input; an adaptive DC-DC boost control unit having a control input and a control output; and an acoustic noise suppression filter having a filter input connected to the control output of the adaptive DC-DC boost control unit and a filter output connected to the converter set value input of the DC-DC boost converter, the acoustic noise suppression filter being configured to filter out the resonant frequency of the circuit board caused by the AC signal on the boost decoupling capacitor.

Description

[0001] This application is a divisional application of Chinese patent application 202110744972.1, entitled “Adaptive DC-DC Boost Converter Device”, filed on July 1, 2021. Technical Field

[0002] The present invention relates to an adaptive DC-DC boost converter device, comprising a circuit board having a plurality of electronic components mounted thereon, the plurality of electronic components comprising an adaptive DC-DC boost converter circuit and a boost decoupling capacitor connected to the output of the adaptive DC-DC boost converter circuit. Background Art

[0003] In many electronic devices, DC-DC boost converters are used to step up the supply voltage, for example, in battery-operated devices, in order to adjust the low battery voltage to a high supply voltage. This is efficient from an energy efficiency perspective, as the supply voltage can be adjusted only when needed. However, the decoupling capacitors often used in such DC-DC boost converters can cause unwanted acoustic noise in the electronic device.

[0004] International patent publication WO2015 / 105719 discloses a technique for eliminating noise using a device with a multilayer ceramic capacitor. In the circuit, one capacitor is coupled to a reference ground and another capacitor is coupled to a power supply voltage. The multilayer ceramic capacitor is made of a material that allows the capacitor package to not change shape or vibrate due to voltage level fluctuations.

[0005] US Patent Publication No. 9,615,460 discloses a circuit board device for reducing acoustic noise. A specific PCB board layout is provided, with either side of the PCB having two capacitor packaging areas arranged in a back-to-back manner. Summary of the invention

[0006] The present invention seeks to provide a solution to suppress audible noise originating from ceramic capacitors included on a (printed) circuit board when an AC signal is applied.

[0007] According to the present invention, as defined above, there is provided an adaptive DC-DC boost converter device, further comprising a DC-DC boost converter, an adaptive DC-DC boost control unit and an acoustic noise suppression filter. The DC-DC boost converter has a converter setpoint input, a boost power input and a boost voltage output. The adaptive DC-DC boost control unit has a control input and a control output. The acoustic noise suppression filter has a filter input connected to the control output of the adaptive DC-DC boost control unit and a filter output connected to the converter setpoint input of the DC-DC boost converter, the acoustic noise suppression filter being configured to filter out the resonant frequency of the circuit board caused by the AC signal on the boost decoupling capacitor.

[0008] Embodiments of the present invention have the advantage that an adaptive DC-DC boost converter device can be applied to an electronic circuit using a simple board circuit with low cost, low complexity layout requirements and minimum size. It provides a simpler solution for suppressing audible noise originating from ceramic capacitors while maintaining the ability to boost the supply voltage, such as in applications with high amplifier output power.

[0009] In another aspect, the invention relates to an electronic circuit comprising an adaptive DC-DC boost converter arrangement according to any of the embodiments described herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be discussed in more detail below with reference to the accompanying drawings, in which

[0011] Figure 1 A schematic diagram showing an electronic circuit using an adaptive DC-DC boost converter device according to an embodiment of the present invention;

[0012] Figure 2 A signal diagram showing exemplary input and output signals of an acoustic noise suppression filter used in an adaptive DC-DC boost converter arrangement according to an embodiment of the present invention;

[0013] Figure 3 Shows Figure 2 a graph of the power spectrum of the signal shown;

[0014] Figure 4 A step response graph showing a filter with overshoot and a filter without overshoot; and

[0015] Figure 5 A circuit diagram of an exemplary embodiment of an acoustic noise suppression filter according to the present invention is shown. DETAILED DESCRIPTION

[0016] Audio amplifiers in mobile applications use a built-in DC-DC boost converter to boost the supply voltage to achieve high amplifier output power. The built-in DC-DC boost converter increases the battery voltage to a higher voltage in the amplifier to allow more power to be driven into its load. Since the built-in DC-DC boost converter boosts the supply voltage only when needed, it reduces the power consumption of the battery, thereby extending battery life. In addition, for audio signals, the boost voltage follows the envelope of the audio signal and therefore changes continuously in response to changing voltage requirements.

[0017] Typically, such audio amplifiers also employ DC-DC boost converter decoupling capacitors on the associated (printed) circuit board to drive the associated load (e.g., speaker). Most audio amplifiers use ceramic capacitors as DC-DC boost converter decoupling capacitors because they are smaller and less expensive while maintaining good performance. However, the disadvantage of using ceramic capacitors on the circuit board is the generation of audible noise, also known as acoustic noise, which comes from the ceramic capacitor, for example, when an AC signal is applied. This is often referred to as "capacitor whine." The ceramic capacitor itself does not generate this audible noise, but it may vibrate, expand, and / or move in response to applied voltage changes, and therefore, the ceramic capacitor may physically vibrate the circuit board. Although the movement of the capacitor is small, only about 1pm-1nm, the noise level is still audible. Specific circuit board resonant frequencies generate most of the audible noise. These resonant frequencies are typically above 4kHz, but may shift to lower frequencies, for example, if the capacitor is physically larger.

[0018] Techniques exist in the art to suppress the effects of “capacitor whine”. One technique is to use multilayer ceramic capacitors, such as disclosed in International Patent Publication WO2015 / 105719, formed of materials that prevent the capacitor package from changing shape or vibrating in response to changing voltage requirements. However, multilayer ceramic capacitors are typically more expensive than ordinary ceramic capacitors, driving up manufacturing costs. Another technique is to use a special PCB board layout with two capacitor package areas arranged in a back-to-back manner on either side of the PCB board, such as disclosed in U.S. Patent Publication US 9,615,460. While this successfully reduces audible noise, this special PCB board layout typically has more complex layout requirements and also requires more space, the latter of which is critical, especially in mobile applications. An alternative technique is to fix the built-in DC-DC boost converter to a constant output voltage, thereby avoiding any changing voltage requirements and suppressing audible noise, but this results in efficiency losses and increased battery consumption.

[0019] Therefore, there is a need in the art to overcome these shortcomings and provide a technique to suppress "capacitor whine" with low cost and low complexity circuitry while maintaining varying voltage requirements through reliable operation.

[0020] Embodiments of the present invention provide an adaptive DC-DC boost converter arrangement to boost a supply voltage while providing a simple solution to suppress audible noise originating from decoupling capacitors with low cost and simple (printed) board circuitry.

[0021] Figure 1 A schematic diagram of an electronic circuit using an adaptive DC-DC boost converter device according to an exemplary embodiment of the present invention is shown. In this exemplary embodiment, the electronic circuit is built around an amplifier 2, and in further applications, it can be a different type of electronic circuit. The adaptive DC-DC boost converter device includes a circuit board having a plurality of electronic components mounted thereon, the plurality of electronic components including an adaptive DC-DC boost converter circuit 3, and a boost decoupling capacitor C connected to the output of the adaptive DC-DC boost converter circuit 3. bst The circuit board may be a conventional printed circuit board PCB, for example, with an epoxy or ceramic base, or a flexible printed circuit (FPC). The adaptive DC-DC boost converter circuit 3 is arranged to boost the supply voltage of the amplifier 2, thereby reducing the power consumption of the battery power supply. The battery power supply in this exemplary embodiment is represented by the battery capacitor C BAT , the battery capacitance C BAT With boost inductor L BST The battery voltage V connected to the DC-DC boost converter circuit 3 BAT In this exemplary embodiment, the amplifier 2 drives a load 9 (eg, a speaker) and is arranged to receive an input signal via an input interface 8 and a delay line 7. The input interface 8 may receive an interface input 8 from, for example, an external circuit or component. i .

[0022] Boost decoupling capacitor C bst For example, a ceramic capacitor connected directly to ground may be included. This will reduce the level of high frequency noise in the output signal of the adaptive DC-DC boost converter circuit 3.

[0023] The adaptive DC-DC boost converter circuit 3 comprises a DC-DC boost converter 4 and an adaptive DC-DC boost control unit 5. The DC-DC boost converter 4 has a converter setpoint input 4 i , boost power input 4 s and boost voltage output 4 o The adaptive DC-DC boost control unit 5 has a control input 5 iand control output 5 o The adaptive DC-DC boost control unit 5 receives a control input 5 i , and output control output 5 o Similarly, the DC-DC boost converter 4 receives a converter setting input 4 i and a boost supply input 4 from battery power S , and output the corresponding boost voltage output 4 o .

[0024] In a particular embodiment, the adaptive DC-DC boost control unit 5 is arranged to determine a converter setpoint input 4 for input to the DC-DC boost converter 4. i The converter setpoint is related to the converter setpoint at the control input 5 i In other words, the adaptive DC-DC boost control unit 5 is arranged to calculate the converter setpoint input 4 of the DC-DC boost converter 4 i , where the boost voltage output is 4 o "Follow" control input 5 i , that is, the converter setpoint is a time-varying signal. In the following description, the signal level on a signal, such as a control input, may include a voltage level or a voltage amplitude. For example, if the control input 5 i If the voltage level is high, the boost voltage output 4 o On AND control input 5 i The proportional signal will also have a high voltage level.

[0025] As a non-limiting example to describe the operation of the adaptive DC-DC boost converter circuit 3, the adaptive DC-DC boost control unit 5 receives a control input 5 i The high voltage level on the power supply voltage is determined, and thus it is determined that the power supply voltage is to be boosted. The adaptive DC-DC boost control unit 5 inputs the determined input to the converter set value input terminal 4 i The DC-DC boost converter 4 receives a converter set point input 4 having an associated high (DC-DC) converter set point. i , wherein the relevant high (DC-DC) converter setting value is determined by the adaptive DC-DC boost control unit 5 according to the high voltage level. The DC-DC boost converter 4 also receives a boost power input 4 s , and determine the boost power input 4 s The voltage level on is insufficient compared to the high (DC-DC) converter set value determined by the adaptive DC-DC boost control unit 5. Then, in combination with the boost decoupling capacitor C bst, the DC-DC boost converter 4 can continue to boost the voltage level on the boost power input 4s to make the boost voltage output 4 o Thus, the adaptive DC-DC boost converter circuit 3 including the adaptive DC-DC boost control unit 5 and the DC-DC boost converter 4 boosts the power supply voltage, thereby reducing the power consumption of the battery power supply in actual use.

[0026] exist Figure 1 In the illustrated embodiment, the adaptive DC-DC boost converter circuit 3 further comprises an acoustic noise suppression filter 6 having a control output 5 connected to the adaptive DC-DC boost control unit 5. o Filter input 6 i and a converter setpoint input 4 connected to the DC-DC boost converter 4 i The filter output 6 o The acoustic noise suppression filter 6 is arranged to filter out the resonant frequencies that cause "capacitor howling", i.e. the resonant frequencies of the circuit board as described above, i.e. the technical effect of the acoustic noise suppression filter 6 is that for resonant frequencies typically above 4 kHz, pm-nm level resonances of the circuit board are prevented, which are for example caused by the boost decoupling capacitor C mounted on the circuit board. bst The acoustic noise suppression filter 6 is connected in series with the adaptive DC-DC boost control unit 5 and the DC-DC boost converter 4. In this regard, combined with the characteristic of boosting the power supply voltage in actual use, this has advantages over the prior art, thereby reducing "capacitor howling" and reducing the power consumption of the battery power supply.

[0027] exist Figure 1 In the embodiment shown, the noise suppression filter 6 is located after the adaptive DC-DC boost control unit 5. This is due to the nonlinear characteristics of the adaptive DC-DC boost control unit 5, which may trigger the boost decoupling capacitor C bst The acoustic noise suppression filter 6 is arranged after the adaptive DC-DC boost control unit 5, which enables the acoustic noise suppression filter 6 to suppress the additional high frequencies, ie the frequencies higher than, for example, 4Khz, generated by the adaptive DC-DC boost control unit 5.

[0028] Similarly, in Figure 1 In the embodiment shown, the noise suppression filter 6 is located before the DC-DC boost converter 4. This is to avoid additional costs because the noise suppression filter 6 is placed between the DC-DC boost converter 4 and the boost decoupling capacitor C bst External components such as capacitors and inductors of higher value and grade will be required, which will result in higher costs.

[0029] More generally, the embodiments of the invention described herein all relate to an adaptive DC-DC boost converter apparatus, which includes a circuit board having a plurality of electronic components mounted thereon, the plurality of electronic components including an adaptive DC-DC boost converter circuit 3 and a boost decoupling capacitor C connected to the output of the adaptive DC-DC boost converter circuit 3. bst The adaptive DC-DC boost converter circuit 3 includes a DC-DC boost converter 4, an adaptive DC-DC boost control unit 5, and an acoustic noise suppression filter 6. The DC-DC boost converter 4 has a converter setpoint input 4. i , boost power input 4 s , and boost voltage output 4 o The adaptive DC-DC boost control unit 5 has a control input 5 i and control output 5 o The acoustic noise suppression filter 6 has a control output 5 connected to the adaptive DC-DC boost control unit 5. o Connect filter input 6 i and the converter setpoint input 4 of the DC-DC boost converter 4 i Connect filter output 6 o All described embodiments provide an adaptive DC-DC boost converter arrangement to boost the supply voltage in, for example, high amplifier output power applications, with a simple and reliable solution to suppress audible noise originating from decoupling capacitors, with low cost and low complexity circuitry, and minimal size layout requirements.

[0030] In an exemplary embodiment, the acoustic noise suppression filter 6 is a low pass filter. In this regard, the acoustic noise suppression filter 6 allows frequencies less than a certain cutoff frequency to pass unchanged, while all other frequencies, i.e., noise, are greatly changed and attenuated (pass bandwidth of 0 to x kHz). This reduces the audible noise generated by a certain circuit board resonant frequency.

[0031] In a further specific embodiment, the acoustic noise suppression filter 6 has a pass bandwidth of less than 4 kHz. In an exemplary embodiment, the acoustic noise suppression filter 6 has a pass bandwidth of less than (or equal to) about 1 kHz. The pass bandwidth can have a minimum frequency of 0 Hz (low pass filter), or can be centered on the center frequency, depending on the specific application. For example, an acoustic noise suppression filter 6 (i.e., a low pass filter) having a pass bandwidth of approximately from 0…1 kHz will allow all frequencies equal to and less than 1 kHz to pass unchanged, and any signal with a frequency above 1 kHz will be changed and greatly attenuated to filter out any possible noise. In another example, an acoustic noise suppression filter 6 with a pass bandwidth of 1 kHz, a lower cutoff frequency f1 of 2.5 kHz and an upper cutoff frequency f2 of 3.5 kHz will allow frequencies between 2.5 kHz and 3.5 kHz to pass unchanged, and any frequency below 2.5 kHz and above 3.5 kHz is changed and attenuated, so the center frequency is equal to That is 3 kHz. In a further embodiment, the acoustic noise suppression filter 6 is a bandpass filter and the upper cut-off frequency of the bandpass filter is less than 4 kHz.

[0032] The exemplary size of the pass bandwidth of the acoustic noise suppression filter 6 is related to, for example, the circuit board, the boost decoupling capacitor C bst The physical size of the boost decoupling capacitor C bst The combination of the form factor and the specific application is specific. As mentioned above, in general, the specific circuit board resonant frequency that produces audible noise is usually above 4kHz, so the acoustic noise suppression filter 6 including a low pass filter with a pass bandwidth from about 0...1kHz greatly reduces the audible noise at 4kHz and higher frequencies without greatly attenuating the real signal including the frequency below 1kHz.

[0033] In general, in further embodiments, the pass bandwidth is determined by the boost decoupling capacitor C bst More specifically, the boost decoupling capacitor (C bst ) depends inversely on the pass bandwidth. As mentioned above, for example, if the boost decoupling capacitor C bst If the physical size of the acoustic noise suppression filter is large, the resonant frequency may shift to a lower frequency, and therefore, a low-pass filter with a smaller pass bandwidth, for example, a pass bandwidth less than 1kHz, may be required. When the acoustic noise suppression filter is a bandpass filter, a bandpass filter with a lower center frequency may be required.

[0034] For example, if you need to suppress the resonant frequency of 2kHz, the pass bandwidth can also be equal to 1kHz, the upper cutoff frequency can be 1.5kHz, and the lower cutoff frequency can be 0.5kHz, which will allow the frequencies between 0.5kHz and 1.5kHz to pass and not be changed, and any frequency below 0.5kHz and above 1.5kHz will be changed and attenuated. In short, the frequency of audible noise is not between the upper cutoff frequency and the lower cutoff frequency.

[0035] As another non-limiting example, for an amplifier 2 with an input frequency of 500 Hz, and a boost coupling capacitor C comprising two (standard 0603) 10 μF ceramic capacitors (each measuring 1.6 x 0.8 mm) in parallel, bst , the audible noise has resonant frequencies of 4kHz and 14kHz, a pass bandwidth of 1kHz is sufficient. In the non-limiting example given, if the boost coupling capacitor C bst By including a single (0805) 20μF ceramic capacitor (measuring 2 x 1.25mm), the resonant frequency can be shifted to a lower frequency.

[0036] Please note in this regard that Figure 1 The DC-DC boost converter circuit 3 in the device is arranged to follow the envelope of the input signal, which means that, in the absence of the acoustic noise suppression filter 6, the input signal and the amplified output signal (relative to the boost power input 4 s ) may have frequency components in the range above the filter pass bandwidth.

[0037] exist Figure 1 In the exemplary embodiment shown, the acoustic noise suppression filter 6 is a fourth-order low-pass filter. Compared to a low-order low-pass filter, such as a first-order low-pass filter, a fourth-order low-pass filter allows to obtain a better defined attenuation characteristic, which has a frequency higher than the pass bandwidth. In a non-limiting example, Figure 2 Shown as Figure 1 The graph of the input signal and output signal of the acoustic noise suppression filter 6 used in the adaptive DC-DC boost converter circuit 3 shown in the figure has the horizontal axis as time and the vertical axis as voltage amplitude, wherein the acoustic noise suppression filter 6 is a fourth-order low-pass filter with a pass bandwidth of 1 kHz. Figure 2 , the dotted line represents an exemplary input signal, ie, the unfiltered signal of the acoustic noise suppression filter 6 , and the solid line represents an exemplary output signal, ie, the filtered signal of the acoustic noise suppression filter 6 .

[0038] like Figure 2As shown, the exemplary output signal has a similar waveform to the exemplary input signal, with no significant difference in the characteristics of the wave, especially the amplitude of the wave. This indicates that the acoustic noise suppression filter 6 does not filter the more relevant characteristics of the input signal. Figure 3 Explained Figure 2 The power spectra of the two signals are shown in . A suppression of >16 dB is obtained at 4 kHz, and the suppression increases further at higher frequencies. Therefore, the audible noise is sufficiently suppressed by the acoustic noise suppression filter 6.

[0039] Notice, Figure 2 The examples provided for input signals and output signals are non-limiting, and actual input signals and output signals depend on many factors, such as circuit board design, and therefore, may include different signal characteristics and associated waveforms.

[0040] exist Figure 5 In the exemplary embodiment shown, the acoustic noise suppression filter 6 comprises four first-order filters 6 a -6 d Note that the acoustic noise suppression filter 6 in further embodiments comprises one, two or three first-order filters. a -6 d The cascade is connected in series. Four first-order filters 6 a -6 d Each of them is a circuit comprising a first amplifier 11 having a first multiplication factor a1-d1 a -11 d , a second amplifier 15 having a second multiplication factor a2-d2 a -15 d , adder 12 a -12 d , Quantizer 13 a -13 d and delay element 14 a -14 d .

[0041] exist Figure 5 In the exemplary embodiment shown, the first multiplication coefficients a1, b1, c1 and d1 are equal to 1 / 64, 1 / 64, 1 / 32 and 1 / 16 respectively, and the second multiplication coefficients a2, b2, c2 and d2 are equal to 1-1 / 64, 1-1 / 64, 1-1 / 32 and 1-1 / 16 respectively. a -6 d The four quantizers in 13 a -13 d It includes, for example, a 20-bit quantizer and is located in four first-order filters 6 a -6d The four delay elements 14 a -14 d The various components may be implemented in digital circuits. It should be noted that Figure 5 The multiplication coefficients (a1-d1; a2-d2), quantizer values ​​(13 a -13 d ) and delay element time (e.g., 1 second) are described as non-limiting examples. In this regard, the exact values ​​of the multiplication factor, quantizer value, and delay element time may vary and depend on the specific application.

[0042] In addition to the different multiplication factors just discussed, the four first-order filters 6 a -6 d The operations of each of are similar to each other.

[0043] In a further exemplary embodiment, the acoustic noise suppression filter 6 has an open loop transfer function with a phase margin of 90 degrees or more. In this embodiment, the noise suppression filter 6 stops any overshoot of the signal when providing a step-up voltage, thereby allowing the voltage level on the signal to gradually reach the desired voltage level. This is Figure 4 , which shows the step response of an exemplary filter causing overshoot and the step response without overshoot, which is a characteristic of the acoustic noise suppression filter 6 of an embodiment of the present invention, for example Figure 5 The filter 6 shown is in the form of a cascade of four first-order filters. Without an open-loop transfer function with a 90-degree phase margin, the step response, i.e. the signal overshoot of the boost supply, would result in a sudden, higher-than-expected high voltage level, which could damage, for example, the amplifier 2. Although the overshoot could be compensated by, for example, using a larger amplifier 2, this would require more board space. Therefore, the acoustic noise suppression filter 6 with an open-loop transfer function with a 90-degree phase margin offers many advantages over solutions known in the art.

[0044] An exemplary embodiment of the present invention in a further aspect relates to an electronic circuit comprising an adaptive DC-DC boost converter device according to any of the above embodiments, wherein the electronic circuit is one of an amplifier; an analog-to-digital converter; a digital-to-analog converter; an encoder / decoder circuit; a radio frequency circuit; a power amplifier; and a voltage regulator.

[0045] exist Figure 1 In the exemplary embodiment shown, the electronic circuit is an amplifier having an input 2 i , Power input 2 s and amplifier output 2 oAmplifier circuit 2, where the power input 2 s With boost voltage output 4 o Connections, amplifier input 2 i With control input 5 i Connection. Boost voltage output 4 o has a signal having an adjusted voltage level, as adjusted by the adaptive DC-DC boost converter circuit 3. When the boost voltage output 4 o Connect to power input 2 s When the amplifier circuit 2 receives the power input 2 s , boost voltage output 4 o The signal on is the adjusted voltage level.

[0046] The amplifier circuit also receives an amplifier input 2i, wherein the amplifier circuit 2 processes the amplifier input 2i. i and power input 2 s , and the resulting signal is used as amplifier output 2 o Output. Load 9 receives amplifier output 2 o The load 9 may include, for example, a speaker or an antenna.

[0047] exist Figure 1 In the exemplary embodiment shown, the plurality of electronic components also includes a delay line 7 connected to the input of the electronic circuit. The delay line 7 allows sufficient time for the adaptive DC-DC boost converter circuit 3 to process the input signal, adjust the voltage level thereon, and output the boosted voltage output 4. o In this regard, the operation of the delay line 7 is separate from the operation of the DC-DC boost converter circuit 3, and thus the delay line 7 plays no role in the processing of the input signal in the DC-DC boost converter circuit 3. In the absence of the delay line 7, the power supply input 2 s can be fed into amplifier circuit 2 in time for further integration with amplifier input 2 i Before processing, the amplifier input 2 i Can be fed into amplifier circuit 2 and used as amplifier output 2 o Output. In a specific embodiment, the delay line 7 has a delay time equal to the settling time of the adaptive DC-DC boost converter circuit 3. The settling time of the DC-DC boost converter circuit 3 is a design parameter used to provide the correct design implementation parameters of the delay line 7. This allows the electronic circuit to perform as efficiently as possible without any unnecessary delays in the process. In an exemplary embodiment, the DC-DC boost converter circuit 3 can be arranged to rise at a rate of 15kV per second. At this typical rise rate, starting from a battery voltage of 2.5V, it takes 500μs to reach 10V: (10-2.5) / 15E 3 =500E -6The length of the delay line 7 which should compensate for this rise time is therefore, for example, about 500 μs. The rise rate is limited to 15 kV per second, or even lower, in order to reduce the battery current required during the rise.

[0048] The invention has been described above with reference to a number of exemplary embodiments shown in the accompanying drawings. Modifications and alternative implementations of some components or elements are possible and are included within the scope of protection defined in the appended claims.

Claims

1. An adaptive DC-DC boost converter device, comprising: a circuit board having a plurality of electronic components mounted thereon; The plurality of electronic components include an adaptive DC-DC boost converter circuit (3) and a boost decoupling capacitor (C) connected to the output of the adaptive DC-DC boost converter circuit (3). bst ), the boost decoupling capacitor is a ceramic capacitor, and the adaptive DC-DC boost converter circuit (3) comprises: A DC-DC boost converter (4) having a converter setpoint input (4 i ), boost power input (4 s ) and boost voltage output (4 o ); An adaptive DC-DC boost control unit (5) having a control input (5 i ) and control output (5 o ); The acoustic noise suppression filter (6) has a control output (5) connected to the adaptive DC-DC boost control unit (5) o ) filter input (6 i ) and connected to the set value input (4) of the DC-DC boost converter (4) i ) filter output (6 o ), wherein the acoustic noise suppression filter is configured to filter out a resonant frequency of vibration of the circuit board caused by the boost decoupling capacitor in response to a change in an applied voltage.

2. The adaptive DC-DC boost converter device according to claim 1, wherein: The adaptive DC-DC boost control unit (5) is arranged to determine a converter setpoint input (4) for input to the DC-DC boost converter (4). i ) of the converter setting value, which is related to the control input (5 i ) is proportional to the signal level on the 3. The adaptive DC-DC boost converter device according to claim 1, wherein: The acoustic noise suppression filter (6) is a low-pass filter having a pass bandwidth smaller than the resonance frequency.

4. The adaptive DC-DC boost converter device according to claim 1, wherein: The boost decoupling capacitor (C bst ) has a larger physical size, a lower resonant frequency.

5. The adaptive DC-DC boost converter device according to claim 1, wherein: The acoustic noise suppression filter (6) has a pass bandwidth of less than 4 kHz.

6. The adaptive DC-DC boost converter device according to claim 1, wherein: The acoustic noise suppression filter (6) has a pass bandwidth of less than 1 kHz.

7. The adaptive DC-DC boost converter device according to claim 3, wherein: The pass bandwidth depends on the boost decoupling capacitor (C bst ) physical size, the boost decoupling capacitor (C bst ) has a larger physical size, and the resonant frequency is lower, and the acoustic noise suppression filter (6) is a low-pass filter with a smaller pass bandwidth.

8. The adaptive DC-DC boost converter device according to claim 7, wherein: The boost decoupling capacitor (C bst )'s physical size depends inversely on the pass bandwidth.

9. The adaptive DC-DC boost converter device according to claim 1, wherein: The acoustic noise suppression filter (6) is a bandpass filter, and the upper cutoff frequency of the bandpass filter is lower than the resonance frequency.

10. The adaptive DC-DC boost converter device according to claim 9, wherein: The boost decoupling capacitor (C bst ), the larger the physical size of the element, the lower the resonant frequency, and the lower the center frequency of the bandpass filter.

11. The adaptive DC-DC boost converter device according to claim 1, wherein: The acoustic noise suppression filter (6) is a bandpass filter, and the upper cutoff frequency of the bandpass filter is less than 4 kHz.

12. The adaptive DC-DC boost converter device according to claim 1, wherein: The acoustic noise suppression filter (6) is a fourth-order low-pass filter.

13. The adaptive DC-DC boost converter device of claim 1, wherein: The acoustic noise suppression filter (6) comprises a cascade of four first-order filters (6a-d).

14. The adaptive DC-DC boost converter device according to any one of claims 1 to 13, wherein: The acoustic noise suppression filter (6) has an open-loop transfer function with a phase margin of 90 degrees or more.

15. An electronic circuit comprising an adaptive DC-DC boost converter device according to any one of claims 1 to 14, wherein: The electronic circuit is one of an amplifier, an analog-to-digital converter, a digital-to-analog converter, an encoder / decoder circuit, a radio frequency circuit, a power amplifier, and a voltage regulator.

16. The electronic circuit according to claim 15, wherein The plurality of electronic components also includes a delay line (7) connected to an input of the electronic circuit.

17. The electronic circuit according to claim 16, wherein: The delay line (7) has a delay time equal to a settling time of the adaptive DC-DC boost converter circuit (3).

18. The electronic circuit according to any one of claims 15 to 17, wherein: The electronic circuit is an amplifier circuit (2) having an amplifier input (2 i ), power input (2 s ) and amplifier output (2 o ), wherein the power input (2 s ) and the boost voltage output (4 o ) connection, the amplifier input (2 i ) and the control input (5 i )connect.

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