Voltage conditioning circuit

Abstract

The invention provides a voltage conditioning circuit. According to the voltage conditioning circuit provided by the invention, on one hand, the voltage processing circuit and the controller are arranged, and the voltage processing circuit is enabled to have multiple amplification factors, so that the controller can monitor the conditioned voltage signal in real time, and when the voltage value of the conditioned voltage signal does not meet the requirement, the voltage processing circuit is enabled to have multiple amplification factors; according to the voltage conditioning circuit provided by the invention, the amplification factor of the voltage processing circuit is automatically adjusted until the conditioned voltage signal meets the requirement, so that the conditioned voltage signal always meets the requirement when the input voltage is different, and the voltage conditioning circuit provided by the invention can adapt to various power supply conditions; on the second aspect, by arranging the protection circuit, when the input voltage exceeds the preset range, a subsequent circuit can be prevented from being damaged, and the stability and safety of a circuit system are ensured; and thirdly, by arranging the filter circuit and the voltage amplitude limiting circuit, noise and fluctuation in the voltage signal can be effectively removed, and it is ensured that the output voltage is within a safe range.

Description

Technical Field

[0001] The present application relates to the technical field of electronic appliances, and in particular to a voltage conditioning circuit. Background Art

[0002] Voltage conditioning circuits are widely used in various electronic devices to ensure the stability and reliability of the circuit. They are mainly used to adjust the output voltage to stabilize it at a predetermined value. Existing voltage conditioning circuits can only adapt to a specific, single input voltage. This limitation greatly reduces its flexibility and applicability in diverse applications. Summary of the invention

[0003] In view of this, the present application provides a voltage conditioning circuit, which can process a wide range of input voltages and adapt to different power supply conditions.

[0004] Specifically, the present application is implemented through the following technical solutions: The present application provides a voltage conditioning circuit, which includes a protection circuit, a voltage following circuit, a voltage processing circuit, a filtering circuit, a voltage limiting circuit and a controller; wherein: The protection circuit, the voltage follower circuit, the voltage processing circuit, the filter circuit and the voltage limiting circuit are cascaded; the controller is respectively connected to the control end of the voltage processing circuit and the output end of the voltage limiting circuit; The voltage processing circuit has a plurality of magnification factors, and is used to scale the input voltage signal according to the magnification factor specified by the controller under the control of the controller to obtain a scaled voltage signal; the voltage limiting circuit is used to limit the filtered voltage signal to obtain a conditioned voltage signal; wherein the voltage amplitude of the conditioned voltage signal is limited to a preset voltage range; The controller is used to set the amplification factor of the voltage processing circuit to a preset value at the beginning of conditioning to control the voltage processing circuit to start working, and sense the conditioned voltage signal output by the voltage limiting circuit, and then when the voltage value of the sensed conditioned voltage signal does not match the maximum voltage value in the preset voltage range, determine that the current amplification factor does not match the input voltage signal, and when it is determined that the current amplification factor does not match the input voltage signal, adjust the amplification factor of the voltage processing circuit until the voltage value of the conditioned voltage signal matches the maximum voltage value; wherein, when the difference between the maximum voltage value and the voltage value of the conditioned voltage signal is less than a preset threshold value, the voltage value of the conditioned voltage signal matches the maximum voltage value.

[0005] The voltage conditioning circuit provided in the present application, on the first hand, by setting up a voltage processing circuit and a controller, and making the voltage processing circuit have multiple amplification factors, so that the controller can monitor the conditioned voltage signal in real time, and when the voltage value of the conditioned voltage signal does not meet the requirements, automatically adjust the amplification factor of the voltage processing circuit until the conditioned voltage signal meets the requirements. In this way, through the adaptive adjustment of the controller, it can be ensured that the conditioned voltage signal always meets the requirements when the input voltage is different, so that the voltage conditioning circuit can handle different input voltages, that is, the voltage conditioning circuit can adapt to a variety of power supply conditions, which can increase the scope of application of the voltage conditioning circuit; on the second hand, by setting up a protection circuit, it can prevent the subsequent circuit from being damaged when the input voltage exceeds the predetermined range, thereby ensuring the stability and safety of the circuit system; on the third hand, by setting up a filtering circuit and a voltage limiting circuit, it can effectively remove noise and fluctuations in the voltage signal, and ensure that the output voltage is within a preset safety range, which can improve the accuracy and stability of voltage conditioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A schematic diagram of a first embodiment of a voltage conditioning circuit provided in the present application; Figure 2 A circuit diagram of a second embodiment of a voltage conditioning circuit provided in the present application; Figure 3 A circuit diagram of a third embodiment of a voltage conditioning circuit provided in the present application; Figure 4 This is a circuit diagram of Embodiment 4 of the voltage conditioning circuit provided in this application.

[0007] Description of reference numerals: 1: Protection circuit; 2: Voltage follower circuit; 3: Voltage processing circuit; 4: Filter circuit; 5: Voltage limiting circuit; 6: Controller; PT3: fuse; D13: Transient suppression diode; 31: a first processing circuit; 32: second processing circuit; R1: first resistor; C: shared operational amplifier; F: feedback circuit; 33: Inverting amplifier circuit; R L : Filter resistor; C L : Filter capacitor; D1: first diode; D2: The second diode. DETAILED DESCRIPTION

[0008] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0009] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0010] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0011] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0012] Figure 1 This is a schematic diagram of the voltage conditioning circuit embodiment 1 provided in this application. Please refer to Figure 1 The voltage conditioning circuit provided in this embodiment includes a protection circuit 1, a voltage following circuit 2, a voltage processing circuit 3, a filter circuit 4, a voltage limiting circuit 5 and a controller 6; wherein, The voltage conditioning circuit includes a protection circuit 1, a voltage follower circuit 2, a voltage processing circuit 3, a filter circuit 4, a voltage limiter circuit 5 and a controller 6; wherein, The protection circuit 1, the voltage follower circuit 2, the voltage processing circuit 3, the filter circuit 4 and the voltage limiting circuit 5 are cascaded; the controller 6 is respectively connected to the control end of the voltage processing circuit 3 and the output end of the voltage limiting circuit 5; The voltage processing circuit 3 has multiple magnifications, and is used to scale the input voltage signal according to the magnification specified by the controller 6 under the control of the controller 6 to obtain a scaled voltage signal; the voltage limiting circuit 5 is used to limit the filtered voltage signal to obtain a conditioned voltage signal; wherein the voltage amplitude of the conditioned voltage signal is limited to a preset voltage range; The controller 6 is used to set the amplification factor of the voltage processing circuit 3 to a preset value when conditioning starts, so as to control the voltage processing circuit 3 to start working, and sense the conditioned voltage signal output by the voltage limiting circuit 5, and then when the voltage value of the sensed conditioned voltage signal does not match the maximum voltage value in the preset voltage range, determine that the current amplification factor does not match the input voltage signal, and when it is determined that the current amplification factor does not match the input voltage signal, adjust the amplification factor of the voltage processing circuit until the voltage value of the conditioned voltage signal matches the maximum voltage value; wherein, when the difference between the maximum voltage value and the voltage value of the conditioned voltage signal is less than a preset threshold value, the voltage value of the conditioned voltage signal matches the maximum voltage value.

[0013] Specifically, the input end of the protection circuit 1 is connected to the input voltage, and the output end of the protection circuit 1 is connected to the input end of the voltage follower circuit 2; the protection circuit 1 is used to perform overcurrent protection and overvoltage protection on the subsequent circuit; the output end of the voltage follower circuit 2 is connected to the input end of the voltage processing circuit 3; the voltage follower circuit 2 is used to achieve isolation between the front and rear circuits; the output end of the voltage processing circuit 3 is connected to the input end of the filter circuit 4, and the control end of the voltage processing circuit 3 is connected to the controller 6; the voltage processing circuit 3 is used to, under the control of the controller 6, perform the following operations according to the control specified by the controller 6. The amplification factor is used to scale the input voltage signal to obtain a scaled voltage signal; the output end of the filter circuit 4 is connected to the input end of the voltage limiting circuit 5; the filter circuit 4 is used to filter the scaled voltage signal to obtain a filtered voltage signal; the power supply end of the voltage limiting circuit 5 is connected to a preset voltage source, and the output end of the voltage limiting circuit 5 is connected to the controller 6; the voltage limiting circuit 5 is used to limit the filtered voltage signal to obtain a conditioned voltage signal; wherein the voltage amplitude of the conditioned voltage signal is limited to the preset voltage range.

[0014] Specifically, the voltage conditioning circuit is used to provide a stable output voltage, and can output an output voltage within a preset voltage range according to an input voltage.

[0015] It should be noted that the voltage value of the input voltage is set according to actual needs, and is not limited in this embodiment. For example, in one embodiment, the voltage value of the input voltage is 10V; for another example, in another embodiment, the voltage value of the input voltage may be 2V. In addition, the preset voltage range is also set according to actual needs, and is not limited in this embodiment. For example, in one possible implementation, the preset voltage range may be 0 to 3.3V.

[0016] Specifically, refer to Figure 1 , the protection circuit 1 is arranged between the input voltage and the voltage follower circuit 2, and the protection circuit 1 is used to provide over-current protection and over-voltage protection for the subsequent circuit. Figure 1 , the protection circuit 1, the voltage following circuit 2, the voltage processing circuit 3, the filter circuit 4 and the voltage limiting circuit 5 are connected in sequence, and the subsequent circuit after the protection circuit 1 refers to the voltage following circuit 2, the voltage processing circuit 3, the filter circuit 4 and the voltage limiting circuit 5. Through the protection circuit 1, the subsequent circuit after the protection circuit 1 can be prevented from burning.

[0017] For details, please continue to refer to Figure 1 The voltage follower circuit 2 is arranged between the protection circuit 1 and the voltage processing circuit 3 to achieve isolation between the front and rear stage circuits, achieve impedance matching, improve the load capacity, etc.

[0018] It should be noted that the voltage follower circuit 2 can provide high input impedance and low output impedance, and does not change the input voltage during signal transmission. In other words, the output voltage of the voltage follower circuit 2 is the same as the input voltage, and is in a high impedance state for the previous stage circuit and a low impedance state for the next stage circuit, so as to achieve the isolation of the previous and next stage circuits and impedance matching. In addition, the voltage follower circuit 2 can not only isolate the influence between the previous and next stage circuits, but also improve the load capacity and drive the next stage circuit.

[0019] For details, please continue to refer to Figure 1 The voltage processing circuit 3 is arranged between the voltage follower circuit 2 and the filter circuit 4 , and is also connected to the controller 6 .

[0020] It should be noted that the voltage processing circuit 3 is an amplifier circuit whose amplification factor can be adjusted by a control signal from the controller 6 , that is, when scaling the input voltage signal, the amplification factor used can be adjusted.

[0021] For example, in one possible implementation, the voltage processing circuit 3 has four amplification factors. In actual use, through the control of the controller 6 (i.e., through the control signal from the controller 6), one amplification factor can be specified from the four amplification factors as the specified amplification factor, and then the input voltage signal is scaled according to the specified amplification factor to obtain a scaled voltage signal.

[0022] For further information, please refer to Figure 1 , the filter circuit 4 is arranged between the voltage processing circuit 3 and the voltage limiting circuit 5. Specifically, the filter circuit 4 can filter the scaled voltage to obtain a filtered voltage. In specific implementation, the filter circuit 4 can be an RC filter circuit. It can be understood that the RC filter circuit is a filter circuit composed of resistors and capacitors, which is used to filter signals.

[0023] For further information, please refer to Figure 1 The voltage limiting circuit 5 is arranged after the filter circuit 4 and is used to limit the amplitude of the input signal within a certain range.

[0024] It should be noted that the voltage value of the preset voltage source is set according to actual needs and is not limited in this embodiment. For example, in one embodiment, the voltage value of the preset voltage source is equal to 5V.

[0025] For further information, please refer to Figure 1 The controller 6 is connected to the output end of the voltage limiting circuit 5 and the control end of the voltage processing circuit 3 respectively, and is used to control the voltage processing circuit 3 according to the voltage value of the conditioned voltage signal to output a stable output voltage. The control principle inside the controller 6 is briefly introduced below: Specifically, the controller 6 is used to set the amplification factor of the voltage processing circuit 3 to a preset value when conditioning starts, so as to control the voltage processing circuit 3 to start working; further, after the voltage processing circuit 3 starts working, the controller 6 is also used to adjust the amplification factor of the voltage processing circuit 3 according to the matching relationship between the conditioned voltage and the maximum voltage value in the preset voltage range, so that the voltage value of the conditioned voltage signal matches the maximum voltage value.

[0026] In a specific implementation, the controller 6 is specifically used to adjust the control signal output to the voltage processing circuit 3 , thereby achieving the purpose of controlling the amplification factor of the voltage processing circuit 3 .

[0027] It should be noted that the preset value is set according to actual needs and is not limited in this embodiment. For example, in one possible implementation, the preset value may be the minimum value of the amplification factor of the voltage processing circuit 3. For another example, in another possible implementation, the preset value may be the maximum value of the amplification factor of the voltage processing circuit 3. The following description is made by taking the preset value as the minimum value of the amplification factor of the voltage processing circuit 3 as an example.

[0028] In combination with the above example, for example, in one possible implementation, the voltage processing circuit 3 has amplification factors including 0.25 times, 0.5 times, 1 times, 2 times, and 4 times. Initially, by adjusting the control signal output to the voltage processing circuit 3, the amplification factor of the voltage processing circuit 3 is set to 0.25 times, so that the entire voltage conditioning circuit starts working.

[0029] Furthermore, after the voltage conditioning circuit starts to work, it outputs the conditioned voltage signal, referring to Figure 1 , and feeds back the conditioned voltage signal to the controller 6. The controller 6 can further determine the matching relationship between the voltage value of the conditioned voltage signal and the maximum voltage value, and adjust the amplification factor of the voltage processing circuit 3 based on the matching relationship until the voltage value of the conditioned voltage signal matches the maximum voltage value.

[0030] It should be noted that the voltage value of the conditioned voltage signal matches the maximum voltage value means that the voltage value of the conditioned voltage signal is less than the maximum voltage value and is infinitely close to the maximum voltage value. Optionally, in a possible implementation, the voltage value of the conditioned voltage signal matches the maximum voltage value means that the difference between the voltage value of the conditioned voltage signal and the maximum voltage value is less than a preset threshold. It should be noted that the preset threshold is set according to actual needs and is not limited in this embodiment. For example, in one possible implementation, the preset threshold is 0.1; for another example, in another possible implementation, the preset threshold is 0.01.

[0031] In a specific implementation, for example, when the voltage value of the input voltage is 10V and the preset voltage range is 0-3.3V, the preset threshold value is 0.1. Further, when conditioning starts, the amplification factor of the voltage processing circuit 3 is set to 0.25 times. After the input voltage is processed by the voltage conditioning circuit, the voltage value of the conditioned voltage signal is 2.5V. At this time, the voltage value of the conditioned voltage signal is much smaller than the maximum voltage value (3.3V) in the preset voltage range. The controller 6 further adjusts the amplification factor of the voltage processing circuit 3, for example, by increasing the amplification factor of the voltage processing circuit 3 to 0.5 times. Further, after increasing the amplification factor, the voltage value of the conditioned voltage signal is 2.95V. At this time, the conditioned voltage signal meets the requirements.

[0032] It should be noted that the voltage processing circuit 3 has multiple amplification factors and can adjust the amplification factor according to the control signal of the controller 6, so as to achieve adaptive processing of different input voltages. This flexibility enables the voltage conditioning circuit to handle different power supply conditions, increasing the scope of application of the voltage conditioning circuit.

[0033] The voltage conditioning circuit provided in this embodiment, on the one hand, by setting a voltage processing circuit and a controller, and making the voltage processing circuit have multiple amplification factors, so that the controller can monitor the conditioned voltage signal in real time, and when the voltage value of the conditioned voltage signal does not meet the requirements, automatically adjust the amplification factor of the voltage processing circuit until the conditioned voltage signal meets the requirements. In this way, through the adaptive adjustment of the controller, it can be ensured that the conditioned voltage signal always meets the requirements when the input voltage is different, so that the voltage conditioning circuit can process different input voltages, that is, the voltage conditioning circuit can adapt to a variety of power supply conditions, which can increase the scope of application of the voltage conditioning circuit; on the second hand, by setting a protection circuit, it can prevent the subsequent circuit from being damaged when the input voltage exceeds the predetermined range, thereby ensuring the stability and safety of the circuit system; on the third hand, by setting a filtering circuit and a voltage limiting circuit, it can effectively remove noise and fluctuations in the voltage signal, and ensure that the output voltage is within a preset safety range, which can improve the accuracy and stability of voltage conditioning.

[0034] Optionally, in a possible implementation, the controller 6 is specifically configured to: When conditioning starts, the amplification factor of the voltage conditioning circuit is set to a middle number of a set of candidate amplification factors consisting of the plurality of amplification factors, so as to control the voltage processing circuit to start working; Using the intermediate number as an update value, determining whether the voltage value of the conditioned voltage signal matches the maximum voltage value; When the voltage value of the conditioned voltage signal does not match the maximum voltage value and the voltage value of the conditioned voltage signal is less than the maximum voltage value, the minimum value of the candidate amplification factor set is updated to the updated value; when the conditioned voltage signal does not match the maximum voltage value and the voltage value of the conditioned voltage signal is greater than or equal to the maximum voltage value, the maximum value of the candidate amplification factor set is updated to the updated value; Determine a new intermediate number of all magnification factors between a minimum value of the candidate magnification factor set and a maximum value of the candidate magnification factor set, and adjust the magnification factor of the voltage processing circuit to the new intermediate number; The new intermediate number is used as an updated value, and the step of determining whether the voltage value of the conditioned voltage signal matches the maximum voltage value is performed again until the conditioned voltage signal matches the maximum voltage value.

[0035] It should be noted that, when the alternative magnification set contains an even number of magnifications, the middle number of the alternative magnification set can be any one of the two magnifications located in the middle; when the alternative magnification set contains an odd number of magnifications, the middle number of the alternative magnification set is the median of the multiple magnifications contained in the alternative magnification set.

[0036] It is understandable that after the minimum value or maximum value of the candidate magnification set is updated, the candidate magnification set (the next magnification to be used is to be found from the candidate magnification set) changes. For example, after the minimum value of the candidate magnification set is updated, the candidate magnification set is composed of all magnifications between the updated minimum value and the previous maximum value. For another example, after the maximum value of the candidate magnification set is updated, the candidate magnification set is composed of the previous minimum value and the updated maximum value.

[0037] For example, in one possible implementation, the amplification factors provided by the voltage processing circuit 3 include 0.025, 0.05, 0.075, 0.1, 0.125, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.6, 2, 2.4, 3.2, 4, 4.8, 6.4, 8, 9.6, 12.8, and 16 times. The middle number of the multiple amplification factors of the voltage processing circuit 3 is 1 times. When conditioning starts, the amplification factor of the voltage processing circuit 3 is first set to 1 times.

[0038] Combined with the previous example, for example, the preset voltage range is 0 to 3.3V, and the maximum voltage value in the preset voltage range is 3.3V. After the amplification factor of the circuit processing circuit is set to 1, at this time, the update value is 1. Further, after conditioning by the voltage conditioning circuit, the conditioned voltage signal is 1V. At this time, the conditioned voltage signal does not match the maximum voltage value, and the voltage value of the conditioned voltage signal is less than the maximum voltage value. At this time, the minimum value of the alternative amplification factor set is updated to 1, that is, at this time, the alternative amplification factor set The minimum value of the alternative magnification set is 1 times, the maximum value of the alternative magnification set is 16 times, and all magnifications between the minimum value of the alternative magnification set and the maximum value of the magnification include 1, 1.2, 1.6, 2, 2.4, 3.2, 4, 4.8, 6.4, 8, 9.6, 12.8, and 16 times. At this time, a new intermediate number of all magnifications between the minimum value (1) of the alternative magnification set and the maximum value (16) of the alternative magnification set is determined, and the magnification of the voltage processing circuit 3 is adjusted to the new intermediate number. For example, in this example, the new intermediate number is determined to be 4 times, that is, the magnification of the voltage conditioning circuit 3 is adjusted to 4 times.

[0039] Further, the method multiple of the voltage conditioning circuit 3 is adjusted to 4 times. If the conditioned voltage signal is 4V, at this time, the conditioned voltage signal does not match the maximum voltage value, and the voltage value of the conditioned voltage signal is greater than the maximum voltage value. At this time, the maximum value of the alternative amplification factor set is updated to 4 times, that is, at this time, the minimum value of the alternative amplification factor set is 1 times, and the maximum value of the alternative amplification factor set is 4 times. All amplification factors between the minimum value and the maximum value of the alternative amplification factor set include 1, 1.2, 1.6, 2, 2.4, 3.2, and 4 times. At this time, a new intermediate number of all amplification factors between the minimum value (1) and the maximum value (4) of the alternative amplification factor set is determined, and the amplification factor of the voltage processing circuit 3 is adjusted to the new intermediate number. For example, in this example, the new intermediate number is determined to be 2 times, and the amplification factor of the voltage processing circuit 3 is adjusted to 2 times.

[0040] Furthermore, after the amplification factor of the circuit processing circuit 3 is adjusted to 2 times, if the conditioned voltage signal is 2V, at this time, the conditioned voltage signal does not match the maximum voltage value, and the voltage value of the conditioned voltage signal is less than the maximum voltage value. At this time, the minimum value of the alternative amplification factor set is updated to 2 times, that is, at this time, the minimum value of the alternative amplification factor set is 2 times, and the maximum value of the alternative amplification factor set is 4 times. All amplification factors between the minimum value of the alternative amplification factor set and the maximum value of the alternative amplification factor set include 2, 2.4, 3.2, and 4 times. At this time, a new intermediate number of all amplification factors between the minimum value (2) of the alternative amplification factor set and the maximum value (4) of the alternative amplification factor set is determined, and the amplification factor of the voltage processing circuit 3 is adjusted to the new intermediate number. For example, in this example, the new intermediate number is determined to be 3.2 times, and the amplification factor of the voltage processing circuit 3 is adjusted to 3.2 times.

[0041] Further, after the amplification factor of the circuit processing circuit 3 is adjusted to 3.2 times, if the conditioned voltage signal is 3.28V, at this time, the conditioned voltage signal matches the maximum voltage value and meets the requirement.

[0042] Referring to the previous introduction, the amplification factors provided by the voltage processing circuit 3 include 0.025, 0.05, 0.075, 0.1, 0.125, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.6, 2, 2.4, 3.2, 4, 4.8, 6.4, 8, 9.6, 12.8, and 16 times. When the conditioning starts, the alternative amplification factor set includes 0.025, 0.05, 0.075, 0.1, 0.125, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.6, 2, 2.4, 3.2, 4, 4.8, 6.4, 8, 9.6, 12.8, 16, the middle number of the alternative magnification set is 1, at this time, the magnification of the voltage processing circuit 3 is set to 1; further, after the magnification of the voltage processing circuit 3 is set to 1, the conditioned voltage signal does not meet the requirements, and the voltage value of the conditioned voltage signal is less than the maximum voltage value, at this time, the alternative magnification set is updated to 1, 1.2 , 1.6, 2, 2.4, 3.2, 4, 4.8, 6.4, 8, 9.6, 12.8, 16, the middle number of the alternative magnification set is 4, the magnification of the voltage processing circuit 3 is set to 4, further, after the magnification of the voltage processing circuit 3 is set to 4, the conditioned voltage signal still does not meet the requirements, and the voltage value of the conditioned voltage signal is greater than the maximum voltage value, at this time, the alternative magnification set is updated to 1, 1.2, 1.6, 2, 2.4, 3.2, 4, the middle number of the alternative magnification set is 2 , the gain of the voltage processing circuit 3 is set to 2; further, after the gain of the voltage processing circuit 3 is set to 2, the conditioned voltage signal still does not meet the requirements, and the voltage value of the conditioned voltage signal is less than the maximum voltage value. At this time, the alternative gain set is updated to 2, 2.4, 3.2, 4, and the middle number of the alternative gain set is 3.2. The gain of the voltage processing circuit 3 is set to 3.2. Further, after the gain of the voltage processing circuit 3 is set to 3.2, the conditioned voltage signal meets the requirements. That is, by adjusting the gain of the voltage processing circuit 3 to 1 times, 4 times, 2 times, and 3.2 times in sequence, it is determined that 3.2 times is a suitable gain, and after 4 attempts, a suitable gain is found from multiple gain factors.

[0043] It should be noted that, compared with trying all the magnification factors one by one, the above method can find the matching magnification factor more quickly, which can reduce the search time and improve the response speed of the circuit.

[0044] The voltage conditioning circuit provided in this embodiment ensures that each adjustment is made in a direction closer to the target value through the above method, thus avoiding unnecessary adjustment processes and being able to quickly find a suitable amplification factor from multiple amplification factors provided by the voltage processing circuit.

[0045] Figure 2 This is a circuit diagram of the voltage conditioning circuit embodiment 2 provided in this application. Please refer to Figure 2 Based on the above embodiment, the voltage processing circuit 3 includes a cascaded first processing circuit 31 and a second processing circuit 32; wherein, Each processing circuit in the first processing circuit 31 and the second processing circuit 32 includes a first resistor R1, a shared operational amplifier C and a multi-channel feedback circuit F connected in parallel, each channel of the feedback circuit F includes a switch and a feedback resistor, the input end of the switch constitutes the input end of the feedback circuit F, the control end of the switch constitutes the control end of the feedback circuit F, the output end of the switch is connected to the first end of the feedback resistor, and the second end of the feedback resistor constitutes the output end of the feedback circuit F; wherein, The first end of the first resistor R1 constitutes the input end of the voltage processing circuit 3; The non-inverting input terminal of the shared operational amplifier C is grounded, the inverting input terminal of the shared operational amplifier C is connected to the input terminal of each feedback circuit F and then connected to the second terminal of the first resistor R1, the output terminal of the shared operational amplifier C is connected to the output terminal of each feedback circuit F and then constitutes the output terminal of the voltage processing circuit 3, and the control terminal of each feedback circuit F constitutes the control terminal of the voltage processing circuit 3 and is connected to the controller 6; The controller 6 is specifically used to control the on / off of each feedback circuit F in the first processing circuit 31 and the second processing circuit 32 , so as to control the amplification factor of the voltage processing circuit 3 .

[0046] Optionally, in a possible implementation, in the first processing circuit 31, the resistance value of the feedback resistor of each feedback circuit F is different, and in the second processing circuit 32, the resistance value of the feedback resistor of each feedback circuit F is different; the number of feedback circuits F included in the first processing circuit 31 and the second processing circuit 32 may be the same or different.

[0047] Specifically, for example, in one possible implementation, the amplification factor provided by the first processing circuit 31 is 0.125, 0.25, 0.5, 1, 2, 4, 8, and 16 times, and the amplification factor provided by the second processing circuit 32 is 0.2, 0.4, 0.6, and 0.8 times. The voltage processing circuit 3 can provide a total of 26 amplification factors, and these 26 amplification factors are: 0.025, 0.05, 0.075, 0.1, 0.125, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.6, 2, 2.4, 3.2, 4, 4.8, 6.4, 8, 9.6, 12.8, and 16. For example, the amplification factor of the first processing circuit 31 is set to 16 times, and the amplification factor of the second processing circuit 32 is set to 0.8 times, so that the amplification factor of the voltage processing circuit 3 is 12.8 times.

[0048] Referring to the above description, it can be understood that when the voltage processing circuit 3 includes the first processing circuit 31 and the second processing circuit 32, the purpose of adjusting the magnification of the voltage processing circuit 3 as a whole can be achieved by adjusting the magnification of the first processing circuit 31 and / or the magnification of the second processing circuit 32. For example, in combination with the above example, when the magnification of the voltage processing circuit 3 needs to be adjusted to 1 times, the magnification of the first processing circuit 31 needs to be adjusted to 1 times, and then all the feedback circuits F of the second processing circuit 32 are disconnected, so that the magnification of the entire voltage processing circuit 3 is 1 times; for another example, when the magnification of the voltage processing circuit 3 needs to be adjusted to 3.2 times, the magnification of the first processing circuit 31 needs to be adjusted to 4 times, and the magnification of the second processing circuit 32 needs to be adjusted to 0.8 times, so that the magnification of the entire voltage processing circuit 3 is 3.2 times.

[0049] It should be noted that the resistance of each feedback resistor is determined according to the relationship between the first resistor R1 and the amplification factor of the voltage processing circuit 3. The resistance of the first resistor R1 and the amplification factor in the voltage processing circuit 3 are set according to actual needs, and are not limited in this embodiment. For example, in a possible implementation, the resistance of the first resistor R1 is 6.8k, and the amplification factor is 0.25, 0.5, 1, 2, and 4 times, then the resistance of the corresponding feedback resistor in each feedback circuit F is 1.7k, 3.4k, 6.8k, 13.6k, and 27.2k, respectively.

[0050] The voltage conditioning circuit provided in this embodiment provides a specific structure of a voltage processing circuit, through which a variety of optional amplification factors can be provided, so that the voltage conditioning circuit can adapt to a variety of different power supply conditions.

[0051] Figure 3This is a circuit diagram of the third embodiment of the voltage conditioning circuit provided in this application. Please refer to Figure 3 , based on the above embodiment, the voltage processing circuit 3 includes a cascaded first processing circuit 31 and an inverting amplifier circuit 33; wherein, The first processing circuit 31 includes a first resistor R1, a shared operational amplifier C and a plurality of parallel feedback circuits F; each feedback circuit F includes a switch and a feedback resistor, the input end of the switch constitutes the input end of the feedback circuit F, the control end of the switch constitutes the control end of the feedback circuit F, the output end of the switch is connected to the first end of the feedback resistor, and the second end of the resistor feedback constitutes the output end of the feedback circuit F; wherein, The first end of the first resistor R1 constitutes the input end of the voltage processing circuit 3; The non-inverting input terminal of the shared operational amplifier C is grounded; the inverting input terminal of the shared operational amplifier C is connected to the input terminal of each feedback circuit F and then connected to the second end of the first resistor R1; the output terminal of the shared operational amplifier C is connected to the output terminal of each feedback circuit F and then constitutes the output terminal of the first processing circuit 31, and is connected to the input terminal of the inverting amplifier circuit 33; the control terminal of each feedback circuit F constitutes the control terminal of the voltage processing circuit 3; The controller 6 is specifically used to control the on / off of each feedback circuit F in the first processing circuit 31 to control the amplification factor of the voltage processing circuit 3 .

[0052] Optionally, in a possible implementation manner, the feedback resistors of each feedback circuit F in the first processing circuit 31 have different resistance values.

[0053] In specific implementation, since the shared operational amplifier C in the first processing circuit 31 will change the input positive voltage signal into a negative voltage signal, in order not to change the voltage polarity, an inverting amplifier circuit 33 is introduced, and the voltage signal will be changed into a positive voltage signal again. Among them, in the first processing circuit 31, the resistance of each feedback resistor is determined according to the relationship between the first resistor R1 and the amplification factor in the voltage processing circuit 3. It should be noted that the resistance of the first resistor R1 and the amplification factor in the voltage processing circuit 3 are set according to actual needs, and in this embodiment, they are not limited. For example, in a possible implementation, the resistance of the first resistor R1 is 6.8k, and the amplification factor is 0.25, 0.5, 1, 2, and 4 times, then the resistance of the corresponding feedback resistor in each feedback circuit F is 1.7k, 3.4k, 6.8k, 13.6k, and 27.2k respectively.

[0054] The controller 6 adjusts the amplification factor of the first processing circuit 31 to achieve the purpose of adjusting the amplification factor of the voltage processing circuit 3 as a whole.

[0055] The voltage conditioning circuit provided in this embodiment provides a specific structure of a voltage processing circuit, through which a variety of optional amplification factors can be provided, so that the voltage conditioning circuit can adapt to a variety of different power supply conditions.

[0056] Figure 4 For the circuit diagram of the fourth embodiment of the voltage conditioning circuit provided in this application, please refer to Figure 4 , based on the above embodiment, the protection circuit 1 includes a fuse PT3 and a transient suppression diode D13; wherein, The first end of the fuse PT3 constitutes the input end of the protection circuit 1 and is connected to the input voltage; The second end of the fuse PT3 is connected to the cathode of the transient suppression diode D13 to form the output end of the protection circuit 1; The anode of the transient suppression diode D13 is grounded.

[0057] The voltage follower of the voltage follower circuit 2 is a voltage follower based on an operational amplifier. Optional, please continue to refer to Figure 4 In a possible implementation, the filter circuit 4 includes a filter resistor R L And filter capacitor C L ;in, The filter resistor R L The first end of the filter circuit 4 constitutes the input end of the filter circuit 4; the second end of the filter circuit 4 and the filter capacitor C L The first end of is connected to form the output end of the filter circuit 4; The filter capacitor C L The second end is grounded.

[0058] Optional, please continue to refer to Figure 4 In a possible implementation, the voltage limiting circuit 5 includes a first diode D1 and a second diode D2; wherein, The positive electrode of the first diode D1 and the negative electrode of the second diode D2 are connected to form the input end and the output end of the voltage limiting circuit 5; The cathode of the first diode D1 constitutes the power supply end of the voltage limiting circuit 5 and is connected to the preset voltage source; The anode of the second diode D2 constitutes the ground terminal of the voltage limiting circuit 5 , and the ground terminal is grounded.

[0059] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A voltage conditioning circuit, characterized in that: The voltage conditioning circuit includes a protection circuit, a voltage following circuit, a voltage processing circuit, a filtering circuit, a voltage limiting circuit and a controller; wherein, The protection circuit, the voltage follower circuit, the voltage processing circuit, the filter circuit and the voltage limiting circuit are cascaded; the controller is respectively connected to the control end of the voltage processing circuit and the output end of the voltage limiting circuit; The voltage processing circuit has a plurality of magnification factors, and is used to scale the input voltage signal according to the magnification factor specified by the controller under the control of the controller to obtain a scaled voltage signal; the voltage limiting circuit is used to limit the filtered voltage signal to obtain a conditioned voltage signal; wherein the voltage amplitude of the conditioned voltage signal is limited to a preset voltage range; The controller is used to set the amplification factor of the voltage processing circuit to a preset value at the beginning of conditioning to control the voltage processing circuit to start working, and sense the conditioned voltage signal output by the voltage limiting circuit, and then when the voltage value of the sensed conditioned voltage signal does not match the maximum voltage value in the preset voltage range, determine that the current amplification factor does not match the input voltage signal, and when it is determined that the current amplification factor does not match the input voltage signal, adjust the amplification factor of the voltage processing circuit until the voltage value of the conditioned voltage signal matches the maximum voltage value; wherein, when the difference between the maximum voltage value and the voltage value of the conditioned voltage signal is less than a preset threshold value, the voltage value of the conditioned voltage signal matches the maximum voltage value.

2. The voltage conditioning circuit according to claim 1, characterized in that: The controller is specifically used for: When conditioning starts, the amplification factor of the voltage conditioning circuit is set to a middle number of a set of candidate amplification factors consisting of the plurality of amplification factors, so as to control the voltage processing circuit to start working; Using the intermediate number as an update value, determining whether the voltage value of the conditioned voltage signal matches the maximum voltage value; When the voltage value of the conditioned voltage signal does not match the maximum voltage value and the voltage value of the conditioned voltage signal is less than the maximum voltage value, the minimum value of the candidate amplification factor set is updated to the updated value; when the conditioned voltage signal does not match the maximum voltage value and the voltage value of the conditioned voltage signal is greater than or equal to the maximum voltage value, the maximum value of the candidate amplification factor set is updated to the updated value; Determine a new intermediate number of all magnification factors between a minimum value of the candidate magnification factor set and a maximum value of the candidate magnification factor set, and adjust the magnification factor of the voltage processing circuit to the new intermediate number; The new intermediate number is used as an updated value, and the step of determining whether the voltage value of the conditioned voltage signal matches the maximum voltage value is performed again until the conditioned voltage signal matches the maximum voltage value.

3. The voltage conditioning circuit according to claim 1 or 2, characterized in that: The voltage processing circuit includes a first processing circuit and a second processing circuit connected in cascade; wherein, Each of the first processing circuit and the second processing circuit comprises a first resistor, a shared operational amplifier and a plurality of feedback circuits connected in parallel; each feedback circuit comprises a switch and a feedback resistor, the input end of the switch constitutes the input end of the feedback circuit, the control end of the switch constitutes the control end of the feedback circuit, the output end of the switch is connected to the first end of the feedback resistor, and the second end of the feedback resistor constitutes the output end of the feedback circuit; wherein, The first end of the first resistor constitutes an input end of the processing circuit; The non-inverting input terminal of the shared operational amplifier is grounded; the inverting input terminal of the shared operational amplifier is connected to the input terminal of each feedback circuit and then connected to the second terminal of the first resistor; the output terminal of the shared operational amplifier is connected to the output terminal of each feedback circuit and then constitutes the output terminal of the processing circuit pair; the control terminal of each feedback circuit constitutes the control terminal of the voltage processing circuit and is connected to the controller; The controller is specifically used to control the on-off of each feedback circuit in the first processing circuit and the second processing circuit to control the amplification factor of the voltage processing circuit.

4. The voltage conditioning circuit according to claim 3, characterized in that: The resistance value of the feedback resistor of each feedback circuit in the first processing circuit is different; The resistance value of the feedback resistor of each feedback circuit in the second processing circuit is different.

5. The voltage conditioning circuit according to claim 1, characterized in that: The voltage processing circuit includes a cascaded first processing circuit and an inverting amplifier circuit; wherein, The first processing circuit includes a first resistor, a shared operational amplifier and a plurality of parallel feedback circuits; each feedback circuit includes a switch and a feedback resistor, the input end of the switch constitutes the input end of the feedback circuit, the control end of the switch constitutes the control end of the feedback circuit, the output end of the switch is connected to the first end of the feedback resistor, and the second end of the resistor feedback constitutes the output end of the feedback circuit; wherein, The first end of the first resistor constitutes an input end of the voltage processing circuit; The non-inverting input terminal of the shared operational amplifier is grounded; the inverting input terminal of the shared operational amplifier is connected to the input terminal of each feedback circuit and then connected to the second terminal of the first resistor; the output terminal of the shared operational amplifier is connected to the output terminal of each feedback circuit and then constitutes the output terminal of the first processing circuit pair, and is connected to the input terminal of the inverting amplifier circuit; the control terminal of each feedback circuit constitutes the control terminal of the voltage processing circuit; The controller is specifically used to control the on-off of each feedback circuit in the first processing circuit to control the amplification factor of the voltage processing circuit.

6. The voltage conditioning circuit according to claim 5, characterized in that: The resistance value of the feedback resistor of each feedback circuit in the first processing circuit is different.

7. The voltage conditioning circuit according to claim 1, characterized in that: The protection circuit includes a fuse and a transient suppression diode; wherein, The first end of the fuse constitutes the input end of the protection circuit and is connected to the input voltage; The second end of the fuse is adjacent to the cathode of the transient suppression diode and constitutes the output end of the protection circuit; The anode of the TVS diode is grounded.

8. The voltage conditioning circuit according to claim 1, characterized in that: The voltage limiting circuit includes a first diode and a second diode; wherein, The anode of the first diode and the cathode of the second diode are connected to form the input end and the output end of the voltage limiting circuit; The cathode of the first diode constitutes the power supply end of the voltage limiting circuit and is connected to the preset voltage source; The anode of the second diode constitutes a ground terminal of the voltage limiting circuit, and the ground terminal is grounded.

9. The voltage conditioning circuit according to claim 1, characterized in that: The filter circuit includes a filter resistor and a filter capacitor; wherein, The first end of the filter resistor constitutes the input end of the filter circuit; the second end of the filter resistor is connected to the first end of the filter capacitor to constitute the output end of the filter circuit; The second end of the filter capacitor is grounded.

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