WO2024001825A1 - Convertisseur analogique-numérique sigma-delta, procédé de commande, puce et dispositif électronique - Google Patents

Convertisseur analogique-numérique sigma-delta, procédé de commande, puce et dispositif électronique Download PDF

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Publication number
WO2024001825A1
WO2024001825A1 PCT/CN2023/100693 CN2023100693W WO2024001825A1 WO 2024001825 A1 WO2024001825 A1 WO 2024001825A1 CN 2023100693 W CN2023100693 W CN 2023100693W WO 2024001825 A1 WO2024001825 A1 WO 2024001825A1
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analog
digital conversion
module
signal
detected
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PCT/CN2023/100693
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English (en)
Chinese (zh)
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丁召明
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芯海科技（深圳）股份有限公司
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Publication of WO2024001825A1 publication Critical patent/WO2024001825A1/fr

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/30—Delta-sigma modulation
    • H03M3/458—Analogue/digital converters using delta-sigma modulation as an intermediate step
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation

Definitions

  • the present application relates to the field of electronic technology, and in particular to a ⁇ - ⁇ analog-to-digital conversion circuit, a control method, a chip and an electronic device.
  • Sigma-Delta Analog-to-Digital Converter (Sigma-Delta Analog-to-Digital Converter, ⁇ - ⁇ ADC) is usually used as a module for measuring current in battery power management systems. It uses its own average properties to measure the current over a period of time. average current.
  • embodiments of the present application provide a ⁇ - ⁇ analog-to-digital conversion circuit, a control method, a chip and an electronic device, which can realize rapid conversion of pulse signals without affecting the normal conversion work. response.
  • the technical solution is as follows:
  • a ⁇ - ⁇ analog-to-digital conversion circuit including at least a first ⁇ - ⁇ analog-to-digital conversion module and a second ⁇ - ⁇ analog-to-digital conversion module.
  • the first ⁇ - ⁇ analog-to-digital conversion module is configured to convert the signal to be detected in the first cycle when the signal to be detected is greater than the set threshold voltage;
  • the second ⁇ - ⁇ analog-to-digital conversion module is configured to convert the signal to be detected in the second period.
  • the ⁇ - ⁇ analog-to-digital conversion circuit includes a plurality of first ⁇ - ⁇ analog-to-digital conversion modules, and each of the first ⁇ - ⁇ analog-to-digital conversion modules corresponds to a set threshold voltage.
  • the starting time of the first period is within the second period, and the duration of the first period is less than the duration of the second period.
  • the first period includes m sampling periods
  • the second period includes n sampling periods
  • m and n are both positive integers
  • m ⁇ n are both positive integers
  • the first ⁇ - ⁇ analog-to-digital conversion module includes a first filtering module
  • the second ⁇ - ⁇ analog-to-digital conversion module includes a second filtering module, the first ⁇ - ⁇ analog-to-digital conversion module and The second ⁇ - ⁇ analog-to-digital conversion module shares the ⁇ - ⁇ modulation module;
  • the ⁇ - ⁇ modulation module is configured to convert the signal to be detected into a modulated signal
  • the first filtering module is configured to perform filtering processing on the modulation signal within the first period to obtain a first conversion result
  • the second filtering module is configured to perform filtering processing on the modulation signal within the second period to obtain a second conversion result.
  • the first ⁇ - ⁇ analog-to-digital conversion module includes a first ⁇ - ⁇ modulation module and a first filtering module
  • the second ⁇ - ⁇ analog-to-digital conversion module includes a second ⁇ - ⁇ modulation module and a first filtering module.
  • the first ⁇ - ⁇ modulation module is configured to convert the signal to be detected in the first period into a first modulation signal when the signal to be detected is greater than the set threshold voltage;
  • the first filtering module is configured to perform filtering processing on the first modulated signal to obtain a first conversion result
  • the second ⁇ - ⁇ modulation module is configured to convert the signal to be detected in the second period into a second modulated signal
  • the second filtering module is configured to perform filtering processing on the second modulated signal to obtain a second conversion result.
  • the ⁇ - ⁇ analog-to-digital conversion circuit also includes a control module
  • the control module is configured to output a control signal based on the signal to be detected and the set threshold voltage, and the control signal is configured to control the working state of the first ⁇ - ⁇ analog-to-digital conversion module.
  • control module is configured to output a first control signal to control the operation of the first ⁇ - ⁇ analog-to-digital conversion module when the signal to be detected is greater than the set threshold voltage; when the signal to be detected is less than or equal to the set threshold voltage, When the threshold voltage is determined, a second control signal is output to control the first ⁇ - ⁇ analog-to-digital conversion module not to work.
  • control module includes a comparator, a first input terminal of the comparator is configured to receive the signal to be detected, a second input terminal is configured to receive the set threshold voltage, and an output terminal is connected to the third input terminal.
  • a ⁇ - ⁇ analog-to-digital conversion module is connected.
  • the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module are reset simultaneously.
  • a control method for a ⁇ - ⁇ analog-to-digital conversion circuit wherein the ⁇ - ⁇ analog-to-digital conversion circuit
  • the conversion circuit includes at least a first ⁇ - ⁇ analog-to-digital conversion module and a second ⁇ - ⁇ analog-to-digital conversion module, and the method includes:
  • Control the first ⁇ - ⁇ analog-to-digital conversion module to convert the signal to be detected in the first cycle when the signal to be detected is greater than the set threshold voltage
  • the second ⁇ - ⁇ analog-to-digital conversion module is controlled to convert the signal to be detected in the second period.
  • a chip including the above-mentioned ⁇ - ⁇ analog-to-digital conversion circuit.
  • an electronic device including the above-mentioned ⁇ - ⁇ analog-to-digital conversion circuit.
  • the ⁇ - ⁇ analog-to-digital conversion circuit may be provided with a first ⁇ - ⁇ analog-to-digital conversion module for converting the pulse signal, and a second ⁇ - ⁇ analog-to-digital conversion module for converting the signal to be detected.
  • the first ⁇ - ⁇ analog-to-digital conversion module can convert pulse signals in a targeted manner without affecting the normal conversion work of the second ⁇ - ⁇ analog-to-digital conversion module.
  • the output of the first ⁇ - ⁇ analog-to-digital conversion module can be The conversion result of the pulse signal realizes a quick response to the pulse signal.
  • Figure 1 shows a schematic diagram of a ⁇ - ⁇ analog-to-digital conversion circuit provided according to an exemplary embodiment of the present application
  • Figure 2 shows a schematic diagram of a ⁇ - ⁇ analog-to-digital conversion circuit provided according to an exemplary embodiment of the present application
  • Figure 3 shows a schematic diagram of a ⁇ - ⁇ analog-to-digital conversion circuit provided according to an exemplary embodiment of the present application
  • Figure 4 shows a schematic diagram of a ⁇ - ⁇ analog-to-digital conversion circuit provided according to an exemplary embodiment of the present application
  • Figure 5 shows a schematic diagram of a ⁇ - ⁇ analog-to-digital conversion circuit provided according to an exemplary embodiment of the present application
  • Figure 6 shows a schematic diagram of a control module provided according to an exemplary embodiment of the present application.
  • Figure 7 shows a flow chart of a control method of a ⁇ - ⁇ analog-to-digital conversion circuit provided according to an exemplary embodiment of the present application
  • Figure 8 shows a schematic diagram of a ⁇ - ⁇ analog-to-digital conversion circuit provided according to an exemplary embodiment of the present application.
  • the term “include” and its variations are open-ended, ie, “including but not limited to.”
  • the term “based on” is “based at least in part on”.
  • the term “one embodiment” means “at least one embodiment”; the term “another embodiment” means “at least one additional embodiment”; and the term “some embodiments” means “at least some embodiments”. Relevant definitions of other terms will be given in the description below. It should be noted that concepts such as “first” and “second” mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units. Or interdependence.
  • the embodiment of the present application provides a ⁇ - ⁇ analog-to-digital conversion circuit.
  • the ⁇ - ⁇ analog-to-digital conversion circuit can be integrated in a chip or provided in an electronic device.
  • the ⁇ - ⁇ analog-to-digital conversion circuit may include a second ⁇ - ⁇ analog-to-digital conversion module and at least one first ⁇ - ⁇ analog-to-digital conversion module, that is, That is, it may include a first ⁇ - ⁇ analog-to-digital conversion module and a second ⁇ - ⁇ analog-to-digital conversion module, or include a plurality of first ⁇ - ⁇ analog-to-digital conversion modules and a second ⁇ - ⁇ analog-to-digital conversion module. module.
  • Each first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module are connected in parallel. The input end can be set to receive the signal to be detected, and the output end can be set to output the corresponding conversion result.
  • the first ⁇ - ⁇ analog-to-digital conversion module can be configured to convert the signal to be detected in the first cycle when the signal to be detected is greater than the set threshold voltage;
  • the second ⁇ - ⁇ analog-to-digital conversion module may be configured to convert the signal to be detected in the second period.
  • the ⁇ - ⁇ analog-to-digital conversion circuit may include a plurality of first ⁇ - ⁇ analog-to-digital conversion modules, each first ⁇ - ⁇ analog-to-digital conversion module.
  • the module corresponds to a set threshold voltage.
  • the threshold voltage can be set in advance, and the set threshold voltage of each first ⁇ - ⁇ analog-to-digital conversion module can be the same or different. This embodiment does not limit the specific set threshold voltage.
  • the following will take a first ⁇ - ⁇ analog-to-digital conversion module as an example for introduction, and the same applies to the other first ⁇ - ⁇ analog-to-digital conversion modules.
  • the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module can be implemented based on the principle of ⁇ - ⁇ averaging, and may include ⁇ - ⁇ ADC or its derivative circuit (such as incremental ⁇ - ⁇ ADC). , this embodiment does not limit the specific circuit types used by the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module.
  • the signal to be detected may be a voltage signal
  • the ⁇ - ⁇ analog-to-digital conversion circuit may convert the voltage signal of the input circuit.
  • the current to be detected can be converted into a corresponding voltage signal, and then the voltage signal can be input into the ⁇ - ⁇ analog-to-digital conversion circuit, and the conversion result can be output after conversion through the ⁇ - ⁇ analog-to-digital conversion circuit. , and then the average current over a period of time can be determined based on the conversion results.
  • ⁇ - ⁇ The specific application scenarios of the analog-to-digital conversion circuit are not limited.
  • the first ⁇ - ⁇ analog-to-digital conversion module can be controlled to convert the pulse signal (that is, the signal to be detected that is greater than the set threshold voltage). That is to say, when a pulse signal is generated, the peak tracking technology can be triggered, that is, the first ⁇ - ⁇ analog-to-digital conversion module is controlled to convert the pulse signal.
  • the second ⁇ - ⁇ analog-to-digital conversion module is controlled to convert the signal to be detected in the second period.
  • the second period may refer to the normal conversion period of the signal to be detected. Taking the incremental Sigma-Delta ADC as an example, assuming the oversampling rate is n, and n is an integer greater than 1, then the second period can be the sampling period after performing n samplings.
  • the second ⁇ - ⁇ analog-to-digital conversion module can perform normal conversion work on the signal to be detected through its average properties.
  • the first ⁇ - ⁇ analog-to-digital conversion module The module can perform conversion work on pulse signals in a targeted manner, and can quickly respond to instantaneous short-term large pulse signals without affecting the normal conversion work of the second ⁇ - ⁇ analog-to-digital conversion module.
  • the starting time of the first period may be within the second period, and the duration of the first period is shorter than the duration of the second period.
  • the end time of the first period may be within the current second period.
  • the pulse signal falls back before the end of the current second period, that is, before the second ⁇ - ⁇ analog-to-digital conversion module completes the normal conversion work, the pulse signal can be converted based on the second period.
  • a ⁇ - ⁇ analog-to-digital conversion module converts the pulse signal to achieve rapid response to the pulse signal.
  • the end time of the first period can also be within the next second period.
  • the pulse signal falls back after the end of the current second period. That is, the first ⁇ - ⁇ analog-to-digital conversion module can perform targeted processing on the pulse signal. conversion does not affect the normal conversion work of the second ⁇ - ⁇ analog-to-digital conversion module.
  • the second period can be obtained based on the pulse signal.
  • the duration of the second period can be set according to the duration of the pulse signal, that is, the duration in which the voltage value of the signal to be detected is greater than the set threshold voltage.
  • the second period may be set in advance.
  • the time length of the pulse signal can be estimated in advance, and the second period can be set based on the estimated time length. That is to say, when a pulse signal is generated, the peak tracking technology can be triggered, and the signal to be detected in the second period is converted based on the first ⁇ - ⁇ analog-to-digital conversion module. On this basis, the power consumption of the ⁇ - ⁇ analog-to-digital conversion circuit can be reduced.
  • This embodiment does not limit the determination method of the second period.
  • the ⁇ - ⁇ analog-to-digital conversion circuit can adopt two circuit structures as shown in Figures 3 and 4.
  • the first circuit structure Referring to the schematic diagram of the ⁇ - ⁇ analog-to-digital conversion circuit shown in Figure 3, the first ⁇ - ⁇ analog-to-digital conversion module includes a first filter module, and the second ⁇ - ⁇ analog-to-digital conversion module includes a second filter module. , the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module share the ⁇ - ⁇ modulation module. That is, the first ⁇ - ⁇ analog-to-digital conversion module includes the ⁇ - ⁇ modulation module and the first filtering module, and the second ⁇ - ⁇ analog-to-digital conversion module includes the ⁇ - ⁇ modulation module and the second filtering module.
  • the input end of the ⁇ - ⁇ modulation module is set to receive the signal to be detected, and the output end is connected to the first filter module and the second filter module respectively. connect.
  • ⁇ - ⁇ modulation module which can be set to convert the signal to be detected into a modulated signal
  • the first filtering module may be configured to filter the modulation signal within the first period to obtain the first conversion result
  • the second filtering module may be configured to filter the modulated signal in the second period to obtain a second conversion result.
  • the ⁇ - ⁇ modulation module can convert the signal to be detected into a series of modulation codes according to its sampling period.
  • the first filter module can obtain the partial modulation code corresponding to the pulse signal (that is, the modulation signal in the first cycle) in a series of modulation codes and perform filtering processing. At the end of the first cycle, the above The partial modulation code is converted into a corresponding first conversion result as a conversion result of the pulse signal.
  • the second filter module can obtain the modulation code corresponding to the second period in the above series of modulation codes according to the second period and perform filtering processing. At the end of the second period, convert the modulation code corresponding to the second period into the corresponding modulation code. The second conversion result is used as the conversion result of the signal to be detected.
  • the first period may include m sampling periods
  • the second period may include n sampling periods, m and n are both positive integers, and m ⁇ n.
  • the ⁇ - ⁇ modulation module can convert the signal to be detected into a series of PDM (Pulse Duration Modulation, pulse width modulation) codes D[0], D [1],...,D[n-1].
  • PDM Pulse Duration Modulation, pulse width modulation
  • the first filtering module can intercept m PDM codes corresponding to the pulse signals, that is, D[k+1], D[k +2],...,D[k+m], and convert m PDM codes, for example, calculate the average value to obtain the conversion result corresponding to the pulse signal.
  • k is any integer from 0 to n-1.
  • the second filter module can receive the above-mentioned n PDM codes, that is, D[0], D[1], «, D[n-1], and convert n PDM codes to obtain the conversion result corresponding to the signal to be detected.
  • the consistency of the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module can be ensured, the correlation between the first conversion result and the second conversion result can be improved, and it can also Further reduce the circuit area of the ⁇ - ⁇ analog-to-digital conversion circuit.
  • the second circuit structure Referring to the schematic diagram of the ⁇ - ⁇ analog-to-digital conversion circuit shown in Figure 4, the first ⁇ - ⁇ analog-to-digital conversion module includes a first ⁇ - ⁇ modulation module and a first filter module.
  • the digital conversion module includes a second sigma-delta modulation mode block and the second filter module.
  • the input end of the first ⁇ - ⁇ modulation module is set to receive the signal to be detected, and the output end is connected to the first filter module;
  • the input end of the second ⁇ - ⁇ modulation module is set to receive the signal to be detected, and the output end is connected to the second filter module connect.
  • the first ⁇ - ⁇ modulation module is configured to convert the signal to be detected in the first period into a first modulation signal when the signal to be detected is greater than the set threshold voltage;
  • the first filtering module is configured to filter the first modulated signal and obtain the first conversion result
  • the second ⁇ - ⁇ modulation module is configured to convert the signal to be detected in the second period into a second modulated signal
  • the second filtering module is configured to filter the second modulation signal and obtain the second conversion result.
  • the first ⁇ - ⁇ modulation module can adjust the signal according to the first ⁇ - ⁇ analog-to-digital conversion module.
  • the sampling period m of the ⁇ analog-to-digital conversion module i.e., the sampling period included in the first period
  • converts the signal to be detected into a series of m PDM codes i.e., the first modulated signal.
  • the first filter module can receive the m PDM codes and convert the m PDM codes to obtain a conversion result corresponding to the pulse signal.
  • the second ⁇ - ⁇ modulation module can convert the signal to be detected into A series of n PDM codes (ie, the second modulated signal).
  • the second filtering module can receive the n PDM codes and convert the n PDM codes to obtain a conversion result corresponding to the signal to be detected.
  • the circuit structures of the first ⁇ - ⁇ modulation module and the second ⁇ - ⁇ modulation module are the same, it can be ensured that the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module
  • the module has consistency and improves the correlation between the first conversion result and the second conversion result.
  • the ⁇ - ⁇ analog-to-digital conversion circuit may also include a control module, and control the working state of the first ⁇ - ⁇ analog-to-digital conversion module based on the control module.
  • the control module may be configured to output a control signal based on the signal to be detected and the set threshold voltage, and the control signal may be configured to control the working state of the first ⁇ - ⁇ analog-to-digital conversion module.
  • control module can be configured to output the first control signal to control the operation of the first ⁇ - ⁇ analog-to-digital conversion module when the signal to be detected is greater than the set threshold voltage; when the signal to be detected is less than or equal to the set threshold voltage, A second control signal is output to control the first ⁇ - ⁇ analog-to-digital conversion module not to work.
  • control module may be configured to output the first control signal when the voltage value of the signal to be detected is greater than the set threshold voltage, and transmit it to the first ⁇ - ⁇ analog-to-digital conversion module, so that the first control signal is A ⁇ - ⁇ analog-to-digital conversion module can receive the first control signal.
  • the first control signal may be used to control enabling of the first ⁇ - ⁇ analog-to-digital conversion module. At this time, the first ⁇ - ⁇ analog-to-digital conversion module can convert the signal to be detected in the first period.
  • the control module can output the second control signal and transmit it to the first ⁇ - ⁇ analog-to-digital conversion module, so that the first ⁇ - ⁇ analog-to-digital conversion module
  • the conversion module can receive the second control signal.
  • the second control signal may be used to control the first ⁇ - ⁇ analog-to-digital conversion module to turn off.
  • the first ⁇ - ⁇ analog-to-digital conversion module may not work, thereby reducing the power consumption of the ⁇ - ⁇ analog-to-digital conversion circuit.
  • the control module may include a comparator, the first input end of the comparator is set to receive the signal to be detected, the second input end is set to receive the set threshold voltage, and the output end is equal to The first ⁇ - ⁇ analog-to-digital conversion module is connected.
  • the comparator can compare the signal to be detected and the set threshold voltage. By configuring the comparator accordingly, the functions of the above control module can be realized.
  • the comparator when the voltage value of the signal to be detected is greater than the set threshold voltage, the comparator can output a high level (ie, the above-mentioned first control signal), and use the high level as the first ⁇ - ⁇ analog-to-digital conversion module Enable signal to control the enablement of the first ⁇ - ⁇ analog-to-digital conversion module; when the voltage value of the signal to be detected is less than or equal to the set threshold voltage, the comparator can output a low level (i.e., the above-mentioned second control signal), The low level is used as a disable signal of the first ⁇ - ⁇ analog-to-digital conversion module, thereby controlling the second ⁇ - ⁇ analog-to-digital conversion module to turn off.
  • a high level ie, the above-mentioned first control signal
  • the comparator when the voltage value of the signal to be detected is less than or equal to the set threshold voltage, the comparator can output a low level (i.e., the above-mentioned second control signal
  • the output end of the control module may be connected to the first filter module in the first ⁇ - ⁇ analog-to-digital conversion module.
  • the above-mentioned first control signal can be specifically used to control the first filter module to be enabled, and the above-mentioned second control signal can be specifically used to control the first filter module to be turned off.
  • the first filter module when it receives the first control signal, it can start to obtain the modulation code currently output by the ⁇ - ⁇ modulation module. After m sampling periods corresponding to the first period, the modulation code is obtained.
  • the partial modulation code corresponding to the pulse signal that is, the above-mentioned m PDM codes), and convert the above partial modulation code into the conversion result corresponding to the pulse signal.
  • the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module is reset at the same time.
  • the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module can be reset based on the reset signal to avoid The next normal conversion cycle is affected by the previous normal conversion cycle, further improving the correlation between the first conversion result and the second conversion result.
  • the first ⁇ - ⁇ analog-to-digital conversion module may not be reset at the same time as the second ⁇ - ⁇ analog-to-digital conversion module, but when each conversion of the pulse signal is completed (that is, at the end of the first cycle ) is reset to avoid resetting when the conversion of the pulse signal is not completed, and also to prevent the first filter module from processing the modulation codes of different pulse signals as one pulse signal, resulting in inaccurate conversion results.
  • the ⁇ - ⁇ analog-to-digital conversion circuit may be provided with a first ⁇ - ⁇ analog-to-digital conversion module for converting the pulse signal, and a second ⁇ - ⁇ analog-to-digital conversion module for converting the signal to be detected.
  • the first ⁇ - ⁇ analog-to-digital conversion module can The pulse signal is converted in a targeted manner without affecting the normal conversion work of the second ⁇ - ⁇ analog-to-digital conversion module.
  • the output of the first ⁇ - ⁇ analog-to-digital conversion module can be The conversion result of the pulse signal realizes a quick response to the pulse signal.
  • the circuit structure of the first ⁇ - ⁇ modulation module and the second ⁇ - ⁇ modulation module can be the same, which can ensure the consistency of the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module and improve The correlation between the first conversion result and the second conversion result.
  • the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module reuse the same ⁇ - ⁇ modulation module, and only the above-mentioned first filter module can be additionally provided to reduce circuit area and power consumption overhead.
  • Embodiments of the present application also provide a control method for a ⁇ - ⁇ analog-to-digital conversion circuit, which can be used to control the above-mentioned ⁇ - ⁇ analog-to-digital conversion circuit.
  • a control method for a ⁇ - ⁇ analog-to-digital conversion circuit which can be used to control the above-mentioned ⁇ - ⁇ analog-to-digital conversion circuit. Referring to the flow chart of the control method of the ⁇ - ⁇ analog-to-digital conversion circuit shown in Figure 7, the method can be as follows:
  • Step 701 obtain the signal to be detected
  • Step 702 control the first ⁇ - ⁇ analog-to-digital conversion module to convert the signal to be detected in the first cycle when the signal to be detected is greater than the set threshold voltage;
  • Step 703 Control the second ⁇ - ⁇ analog-to-digital conversion module to convert the signal to be detected in the second period.
  • the ⁇ - ⁇ analog-to-digital conversion circuit includes a plurality of first ⁇ - ⁇ analog-to-digital conversion modules, and each of the first ⁇ - ⁇ analog-to-digital conversion modules corresponds to a set threshold voltage.
  • the starting time of the first period is within the second period, and the duration of the first period is less than the duration of the second period.
  • the first period includes m sampling periods
  • the second period includes n sampling periods
  • m and n are both positive integers
  • m ⁇ n are both positive integers
  • the first ⁇ - ⁇ analog-to-digital conversion module includes a first filtering module
  • the second ⁇ - ⁇ analog-to-digital conversion module includes a second filtering module, the first ⁇ - ⁇ analog-to-digital conversion module and The second ⁇ - ⁇ analog-to-digital conversion module shares the ⁇ - ⁇ modulation module;
  • the method also includes:
  • the signal to be detected is converted into a modulated signal through the ⁇ - ⁇ modulation module;
  • Control the first filtering module to perform filtering processing on the modulated signal in the first period to obtain a first conversion result
  • the second filtering module is controlled to filter the modulation signal in the second period to obtain a second conversion result.
  • the first ⁇ - ⁇ analog-to-digital conversion module includes a first ⁇ - ⁇ modulation module and a first filtering module
  • the second ⁇ - ⁇ analog-to-digital conversion module includes a second ⁇ - ⁇ modulation module and a first filtering module.
  • the method also includes:
  • the signal to be detected when the signal to be detected is greater than the set threshold voltage, the signal to be detected in the first period is converted into a first modulated signal;
  • the second modulation signal is filtered to obtain a second conversion result.
  • the ⁇ - ⁇ analog-to-digital conversion circuit also includes a control module
  • the method also includes:
  • a control signal is output based on the signal to be detected and the set threshold voltage, and the working state of the first ⁇ - ⁇ analog-to-digital conversion module is controlled based on the control signal.
  • outputting a control signal based on the signal to be detected and the set threshold voltage, and controlling the working state of the first ⁇ - ⁇ analog-to-digital conversion module based on the control signal includes:
  • the first control signal When the signal to be detected is greater than the set threshold voltage, the first control signal is output to control the operation of the first ⁇ - ⁇ analog-to-digital conversion module; when the signal to be detected is less than or equal to the set threshold voltage, the second control signal is output, To control the first ⁇ - ⁇ analog-to-digital conversion module to not work.
  • control module includes a comparator, a first input terminal of the comparator is configured to receive the signal to be detected, a second input terminal is configured to receive the set threshold voltage, and an output terminal is connected to the third input terminal.
  • a ⁇ - ⁇ analog-to-digital conversion module is connected.
  • the method also includes:
  • the first ⁇ - ⁇ analog-to-digital conversion module and the second ⁇ - ⁇ analog-to-digital conversion module are reset simultaneously.
  • the ⁇ - ⁇ analog-to-digital conversion circuit may be provided with a first ⁇ - ⁇ analog-to-digital conversion module for converting the pulse signal, and a second ⁇ - ⁇ analog-to-digital conversion module for converting the signal to be detected. module.
  • the first ⁇ - ⁇ analog-to-digital conversion module can convert pulse signals in a targeted manner without affecting the normal conversion work of the second ⁇ - ⁇ analog-to-digital conversion module.
  • the output of the first ⁇ - ⁇ analog-to-digital conversion module can be The conversion result of the pulse signal realizes a quick response to the pulse signal.
  • the embodiment of the present application also provides a specific ⁇ - ⁇ analog-to-digital conversion circuit.
  • ⁇ - ⁇ analog-to-digital conversion circuit shown in Figure 8 Schematic diagram of the circuit.
  • the circuit can be composed of a resistor, an incremental ⁇ - ⁇ ADC, two filters and a comparator. It can be used to detect current in a battery power management system.
  • the incremental ⁇ - ⁇ ADC can be used as the above-mentioned ⁇ - ⁇ modulation module
  • one filter hereinafter referred to as the first filter
  • another filter hereinafter referred to as the second filter (computer)
  • the comparator can be used as the above-mentioned control module.
  • the first end of the resistor is set to receive the current to be detected, and the second end is set to ground.
  • the incremental ⁇ - ⁇ ADC may include a first amplification unit, a second amplification unit, a third amplification unit, a ⁇ - ⁇ unit, an integration unit and a quantizer.
  • the input terminal of the first amplification unit can be set to receive the voltage of the first terminal of the above-mentioned resistor, the output terminal is connected to the first input terminal of the ⁇ - ⁇ unit, and the amplification factor can be a (a can take any value).
  • the first input terminal of the ⁇ - ⁇ unit may be a non-inverting input terminal connected to the output terminal of the first amplifying unit; the second input terminal may be an inverting input terminal connected to the output terminal of the third amplifying unit; the output terminal is connected to the output terminal of the third amplifying unit.
  • the input terminal of the second amplification unit is connected.
  • the input terminal of the second amplification unit can be connected to the output terminal of the ⁇ - ⁇ unit, the output terminal can be connected to the input terminal of the integrating unit, and the amplification factor can be b (b can take any value).
  • the input terminal of the integrating unit is connected to the output terminal of the second amplification unit, and the output terminal is connected to the input terminal of the quantizer.
  • the input end of the quantizer is connected to the output end of the integrating unit, and the output end is connected to the input end of the third amplification unit, the input end of the first filter, and the input end of the second filter respectively.
  • the input terminal of the third amplification unit can be connected to the output terminal of the quantizer, the output terminal can be connected to the second input terminal of the ⁇ - ⁇ unit, and the amplification factor can be c (c can take any value).
  • the output of the quantizer can be used as the output of the incremental ⁇ - ⁇ ADC.
  • the input terminal of the first filter may be connected to the output terminal of the incremental ⁇ - ⁇ ADC, and the output terminal is set to output the first conversion result Dout1 corresponding to the target signal.
  • the input terminal of the second filter can be connected to the output terminal of the incremental ⁇ - ⁇ ADC, and the output terminal is set to output the second conversion result Dout2 corresponding to the signal to be detected in the first period.
  • the first input terminal of the comparator can be configured to receive the voltage at the first terminal of the resistor, the second input terminal can be configured to receive the set threshold voltage, and the output terminal is connected to the first filter.
  • the current I can be converted into the voltage Vin through the resistor R, and Vin can be input into the incremental ⁇ - ⁇ ADC.
  • the incremental ⁇ - ⁇ ADC can convert Vin into n PDM codes D[0], D[1],...,D[n-1], where the voltage output by the integrating unit is Ve.
  • the second filter Filter2 converts the above n PMD codes into the corresponding second conversion result Dout2.
  • the comparator compares Vin with the set threshold voltage Vth. If Vin is greater than Vth, it means that the current I is greater than the preset Vth/R, and the comp signal output by the comparator is set to high level.
  • the first filter Filter1 can start to read the PDM codes output by the incremental ⁇ - ⁇ ADC. After k sampling periods, read k PDM codes and convert the k PDM codes into the corresponding first conversion The result Dout1 is the conversion result corresponding to the large pulse current.
  • the reset signal Reset can Reset the first filter Filter1 and the second filter Filter2, and then enter the next cycle to perform conversion.
  • Vin can be considered as a DC voltage, so we can get:
  • Ve[k+1] Ve[k]+b*(a*Vin[k]-c*D[k]).
  • An embodiment of the present application also provides a chip, including the ⁇ - ⁇ analog-to-digital conversion circuit provided by the embodiment of the present application.
  • Chip Integrated Circuit, IC
  • the chip can be but is not limited to a SOC (System on Chip, chip-level system) chip or a SIP (system in package, system-level packaging) chip. This chip can achieve fast response to pulse signals by configuring the above-mentioned ⁇ - ⁇ analog-to-digital conversion circuit.
  • An embodiment of the present application also provides an electronic device, which includes a device body and a chip as described above provided in the device body.
  • Electronic devices may be, but are not limited to, weight scales, body fat scales, nutrition scales, infrared electronic thermometers, pulse oximeters, body composition analyzers, mobile power supplies, wireless chargers, fast charge chargers, car chargers, adapters, and displays.
  • USB Universal Serial Bus, Universal Serial Bus
  • stylus true wireless headphones
  • car central control screen automobile
  • smart wearable devices mobile terminals, smart home equipment.
  • Smart wearable devices include but are not limited to smart watches, smart bracelets, and cervical massagers.
  • Mobile terminals include but are not limited to smartphones, laptops, tablets, and POS (point of sales terminal) machines.
  • Smart home devices include but are not limited to smart sockets, smart rice cookers, smart sweepers, and smart lights. This electronic device can achieve rapid response to pulse signals by configuring the above-mentioned ⁇ - ⁇ analog-to-digital conversion circuit.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

La présente demande se rapporte au domaine technique de l'électronique. L'invention concerne un convertisseur analogique-numérique sigma-delta, un procédé de commande, une puce et un dispositif électronique. Le convertisseur analogique-numérique sigma-delta comprend au moins un premier module de conversion analogique-numérique sigma-delta et un deuxième module de conversion analogique-numérique sigma-delta, le premier module de conversion analogique-numérique sigma-delta étant configuré pour convertir, lorsqu'un signal à détecter est supérieur à une tension de seuil définie, ledit signal dans un premier cycle ; et le deuxième module de conversion analogique-numérique sigma-delta est configuré pour convertir ledit signal dans un deuxième cycle. Au moyen de la présente demande, une réponse rapide à un signal d'impulsion peut être réalisée sur la base du fait que le travail de conversion normal n'est pas affecté.
PCT/CN2023/100693 2022-06-30 2023-06-16 Convertisseur analogique-numérique sigma-delta, procédé de commande, puce et dispositif électronique WO2024001825A1 (fr)

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CN202210762664.6A CN117375622A (zh) 2022-06-30 2022-06-30 一种σ-δ模数转换电路、控制方法、芯片及电子设备

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101040443A (zh) * 2004-10-16 2007-09-19 皇家飞利浦电子股份有限公司 模数转换的方法和设备
KR102041193B1 (ko) * 2018-07-19 2019-11-06 한화시스템 주식회사 신호 처리 방법
CN113296019A (zh) * 2021-05-08 2021-08-24 上海盛位电子技术有限公司 一种漏电检测装置、漏电检测方法和充电设备
CN113671243A (zh) * 2021-07-27 2021-11-19 北京华峰测控技术股份有限公司 电压测量装置和方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101040443A (zh) * 2004-10-16 2007-09-19 皇家飞利浦电子股份有限公司 模数转换的方法和设备
KR102041193B1 (ko) * 2018-07-19 2019-11-06 한화시스템 주식회사 신호 처리 방법
CN113296019A (zh) * 2021-05-08 2021-08-24 上海盛位电子技术有限公司 一种漏电检测装置、漏电检测方法和充电设备
CN113671243A (zh) * 2021-07-27 2021-11-19 北京华峰测控技术股份有限公司 电压测量装置和方法

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