Multipath signal compensation processing circuit and power module

Abstract

A multipath signal compensation processing circuit and a power module belong to the technical field of power modules, and the multipath signal compensation processing circuit comprises multipath signal comparison circuits which are connected to form a first node; the signal comparison circuit comprises a compensation module, an input end and an output end are correspondingly connected with a second node and a third node, the compensation module is used for providing a direct-current component for the third node, and the second node is connected with a signal input end; the input end and the output end of the first impedance adaptation module are correspondingly connected with the third node and the fourth node; the first impedance adaptation module is used for matching the output impedance of the third node; the input end and the output end of the selection module are correspondingly connected with the fourth node and the first node; the selection module is used for transmitting the voltage signal of the fourth node to the first node. Impedance matching is performed on the circuit, and the sampling precision is improved; meanwhile, the applicability of the multi-path signal compensation processing circuit is improved through the compensation module.

Description

Technical Field

[0001] The present application relates to the field of power modules, and in particular to a multi-channel signal compensation processing circuit and a power module. Background Art

[0002] Conventional diode-based sampling circuits can basically achieve the goal of sampling, and are widely used in some cases where the error requirements are low. Based on the basic circuit, the diode voltage drop is compensated by op amp diode feedback to improve the sampling accuracy. However, the main problem of the diode sampling is that the diode voltage drop affects the accuracy, the impedance matching of the front and rear stages is not good, the resistance after the diode is too large to affect the dynamics, and too small to affect the progress and independence of multi-channel sampling. For the acquisition signal, the diode is first used for sampling and then the op amp diode feedback circuit is used. Due to the large output impedance of the sampling circuit, circuits such as directly loaded diodes have a greater impact on the sampling accuracy. Summary of the invention

[0003] The main purpose of the present application is to provide a multi-channel signal compensation processing circuit and a power module, aiming to solve the technical problem that the impedance matching difference of the existing diode sampling circuit affects the sampling accuracy.

[0004] To achieve the above-mentioned purpose, the present application provides a multi-channel signal compensation processing circuit, including: a multi-channel signal comparison circuit, and the multi-channel signal comparison circuit is connected to form a first node; the signal comparison circuit includes: a compensation module, the input end and the output end are correspondingly connected to the second node and the third node, the compensation module is used to provide a DC component to the third node, and the second node is connected to the signal input end; a first impedance adaptation module, the input end and the output end are correspondingly connected to the third node and the fourth node; the first impedance adaptation module is used to match the output impedance of the third node; a selection module, the input end and the output end are correspondingly connected to the fourth node and the first node; the selection module is used to transmit the voltage signal of the fourth node to the first node.

[0005] Optionally, the output voltage of the selection module is the same as the input voltage of the first impedance adaptation module.

[0006] Optionally, the compensation module includes: a fifth resistor, connected to the second node and the third node; a sixth resistor, connected to the reference voltage terminal and the third node; the first impedance adaptation module includes: a first operational amplifier, the in-phase input terminal is connected to the third node, and the output terminal is connected to the fourth node; a first diode, the anode is connected to the fourth node, and the cathode is connected to the inverting input terminal of the first operational amplifier.

[0007] Optionally, the compensation module further includes: a second capacitor, one end of which is connected to the third node and the other end of which is connected to the ground; the selection module further includes: a second diode, an anode of which is connected to the fourth node and a cathode of which is connected to the first node.

[0008] Optionally, a tube voltage drop of the first diode is the same as a tube voltage drop of the second diode.

[0009] Optionally, the signal comparison circuit also includes: a signal acquisition module, whose input and output ends are correspondingly connected to the reference voltage end and the fifth node, and the signal acquisition module is used to convert the collected temperature information into a preset voltage value and output it to the fifth node; a second impedance adaptation module, whose input and output ends are correspondingly connected to the fifth node and the second node, and the second impedance adaptation module is used to match the output impedance of the fifth node.

[0010] Optionally, the signal acquisition module includes: a thermistor, one end of which is connected to the reference voltage terminal and the other end is connected to the fifth node; a second resistor, one end of which is connected to the fifth node and the other end is connected to the ground terminal; a first capacitor, connected in parallel to both ends of the second resistor; the second impedance adaptation module includes: a second operational amplifier, the in-phase input terminal of which is connected to the fifth node and the output terminal of which is connected to the second node; a fourth resistor, one end of which is connected to the second node and the other end is connected to the inverting input terminal of the second operational amplifier; a third resistor, one end of which is connected to the inverting input terminal of the second operational amplifier and the other end is connected to the ground terminal.

[0011] Optionally, the thermistor is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.

[0012] In addition, to achieve the above-mentioned purpose, the present application also provides a power module, including: the above-mentioned multi-channel signal compensation processing circuit; a filtering module connected to the first node and the signal output end.

[0013] Optionally, the filtering module includes: an eighth resistor, one end of which is connected to the first node and the other end is connected to the signal output end; a third capacitor, one end of which is connected to the signal output end and the other end is connected to the ground end; and a ninth resistor, connected in parallel to both ends of the third capacitor.

[0014] The present application provides a multi-channel signal compensation processing circuit and a power module. The output signal of the sampling circuit is firstly impedance matched by an operational amplifier diode feedback circuit, and then the diode is used for taking a larger value, so as to reduce the influence on the sampling accuracy, thereby improving the sampling accuracy and enhancing the load capacity. At the same time, through the compensation module, the signals with different sampling values ​​are compensated so that they reach the same sampling value, thereby improving the applicability of the multi-channel signal compensation processing circuit and ensuring the effectiveness of its sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a multi-channel signal compensation processing circuit of the present application;

[0016] Figure 2 This is a schematic structural diagram of a first embodiment of a multi-channel signal compensation processing circuit of the present application;

[0017] Figure 3This is a structural schematic diagram of a second embodiment of a multi-channel signal compensation processing circuit of the present application;

[0018] Figure 4 This is a schematic structural diagram of a third embodiment of a multi-channel signal compensation processing circuit of the present application;

[0019] Figure 5 This is a structural schematic diagram of a fourth embodiment of a multi-channel signal compensation processing circuit of the present application;

[0020] Figure 6 This is a schematic diagram of the structure of the power module of this application;

[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] Figure 1 FIG. 1 is a schematic diagram of a multi-channel signal compensation processing circuit according to the present embodiment. Figure 1 As shown, the first embodiment of the present application provides a multi-channel signal compensation processing circuit, which may include: a multi-channel signal comparison circuit, and the multi-channel signal comparison circuit is connected to form a first node N1; Figure 2 As shown, each signal comparison circuit may include: a compensation module 110, a first impedance adaptation module 120 and a selection module 130, wherein the input end and the output end of the compensation module 110 are respectively connected to the second node N2 and the third node N3, the compensation module 110 is used to provide a DC component to the third node N3, and the second node N2 is connected to the signal input end Vsamp; the input end and the output end of the first impedance adaptation module 120 are correspondingly connected to the third node N3 and the fourth node N4; the first impedance adaptation module 120 can be used to match the output impedance of the third node N3; the input end and the output end of the selection module 130 are correspondingly connected to the fourth node N4 and the first node N1; the selection module 130 is used to transmit the voltage signal of the fourth node N4 to the first node N1.

[0024] The node in the present application can be understood as an electrical connection point, that is, an electrical connection point formed by connecting multiple sub-circuits. For example, the second node N2 is an electrical connection point formed by connecting the compensation module 110 and the signal input terminal. In some exemplary embodiments, the signal can be a temperature signal, a voltage signal, a current signal, etc.

[0025] The multi-channel signal compensation processing circuit provided by the present application outputs a maximum voltage after comparison of the voltage signal output by the multi-channel signal comparison circuit, performs impedance matching through the first impedance adaptation module 120, and then performs comparison and selection through the selection module 130 to output the maximum voltage, thereby improving the sampling accuracy and load capacity.

[0026] Furthermore, in an exemplary embodiment, the output voltage of the selection module 130 may be the same as the input voltage of the first impedance adaptation module 120 , so that the first impedance adaptation module 120 can perform voltage drop compensation on the selection module 130 , thereby further improving the sampling accuracy.

[0027] For circuits in which the sampling values ​​of multiple signals in the same circuit are different, it is impossible to effectively perform subsequent protection or other processing on each signal through the comparison results of the existing multi-channel signal comparison circuit; in order to solve the above problems, the present embodiment sets a compensation module 110, and the compensation module 110 compensates for the differences in the sampling values ​​of different signal comparison circuits, so that the sampling values ​​of all signal comparison circuits reach the preset sampling values, and then the first impedance adaptation module 120 and the selection module 130 select the signal corresponding to the maximum voltage value in the multi-channel signal comparison circuit, so that each signal can be effectively subsequently protected or otherwise processed, thereby ensuring the effectiveness of the sampling circuit.

[0028] Exemplarily, the multi-channel signal compensation processing circuit may include a signal comparison circuit A and a signal comparison circuit B, and both signals are voltage signals, the sampling value of the signal comparison circuit A is 50V, the sampling value of the signal comparison circuit B is 60V, and the preset sampling value is 60V, that is, when the collected voltage is 60V, it will be output to the first node N1 for subsequent other processing; if the compensation module 110 is not set, the signal comparison circuit A will be lower than 60V under any circumstances, so that the signal comparison circuit A can never participate in the signal output, which will reduce the effectiveness of the sampling circuit. Based on this, the compensation module 110 is set in this embodiment to increase the sampling value of the signal comparison circuit A from 50V to 60V, and when the signal exceeds 60V, it will be output, thereby improving the effectiveness of the sampling circuit. Of course, the above is only an exemplary description of the two-channel signal comparison circuit. For comparison circuits with more than two channels, the working principle is similar and will not be repeated here.

[0029] Figure 3 FIG. 1 is a structural block diagram of a multi-channel signal compensation processing circuit according to another embodiment of the present application. Figure 3As shown, in the multi-channel signal compensation processing circuit, the compensation module 110 may include a fifth resistor R5 and a sixth resistor R6, and the two ends of the fifth resistor R5 are connected to the second node N2 and the third node N3 respectively; the sixth resistor R6 is connected to the reference voltage terminal Vref and the third node N3. The first impedance adaptation module 120 may include a first operational amplifier V1 and a first diode D1, the non-inverting input terminal of the first operational amplifier V1 is connected to the third node N3, and the output terminal of the first operational amplifier V1 is connected to the fourth node N4; the anode of the first diode D1 is connected to the fourth node N4, and the cathode is connected to the inverting input terminal of the first operational amplifier V1; the selection module 130 may include a second diode D2, the anode of the second diode D2 is connected to the fourth node N4, and the cathode is connected to the first node N1.

[0030] In this embodiment, first, the voltage of the signal input terminal Vsamp is limited by the fifth resistor R5, and the voltage of the reference voltage terminal is limited by the sixth resistor R6 to increase the DC component, thereby raising the voltage of the signal input terminal Vsamp, that is, raising the input voltage of the first operational amplifier V1. Therefore, the values ​​of the fifth resistor R5 and the sixth resistor R6 can be adjusted so that the signal lower than the preset sampling value reaches the preset sampling value, thereby ensuring the effectiveness of the sampling circuit. The first operational amplifier V1 can perform impedance adaptation on the third node N3.

[0031] Secondly, in this embodiment, a first diode D1 is provided on the negative feedback circuit of the first operational amplifier V1, and the tube voltage drop of the first diode D1 can be set to be the same as the tube voltage drop of the second diode D2. On this basis, the voltage drop of the second diode D2 can be compensated by the first diode D1, so that the voltage of the in-phase input terminal of the first operational amplifier V1 remains approximately unchanged, the sampling accuracy is improved, and the load capacity is increased to meet the voltage range of the first node N1. Then, the output voltage of the first operational amplifier V1 passes through the second diode D2. If the output voltage of the first operational amplifier V1 exceeds the threshold voltage of the second diode D2, the second diode D2 starts to conduct, thereby generating an output voltage, which is the maximum voltage.

[0032] In an exemplary embodiment, the compensation module 110 may further include a second capacitor C2, the second capacitor C2 is connected to the third node N3 and the ground terminal. The first impedance adaptation module 120 may further include a seventh resistor R7, the first end of the seventh resistor R7 is connected to the cathode of the first diode D1, and the second end is connected to the inverting input terminal of the second operational amplifier V1.

[0033] In this embodiment, the second capacitor C2 can be a low-pass filter capacitor, and the high-frequency interference of the second power module 111 is filtered by the second capacitor C2 to provide a more stable DC power supply. Adding the seventh resistor R7 in the negative feedback loop of the first operational amplifier V1 can adjust the gain and input impedance of the circuit to further achieve impedance matching.

[0034] Figure 4 FIG. 1 is a structural block diagram of a multi-channel signal compensation processing circuit according to another embodiment of the present application. Figure 4 As shown, in the multi-channel signal compensation processing circuit, the signal comparison circuit may further include: a signal acquisition module 140 and a second impedance adaptation module 150, the input end and the output end of the signal acquisition module 140 are correspondingly connected to the reference voltage end Vref and the second node N2; the input end and the output end of the second impedance adaptation module 150 are correspondingly connected to the second node N2 and the fifth node N5, and the second impedance adaptation module 150 is used to match the output impedance of the fifth node N5.

[0035] In this embodiment, when the signal is temperature, based on the above embodiment, it is necessary to add a signal acquisition module 140 to collect temperature, and provide power through the reference voltage terminal Vref. Since the impedance of the signal acquisition module 140 is relatively large, a second impedance matching module 150 is added thereafter to perform impedance matching. Specifically, the signal acquisition module 140 collects temperature signals, converts temperature changes into resistance changes, and performs impedance matching on the signal acquisition module 140 through the second impedance matching module 150, thereby improving the load capacity of the signal acquisition module 140 and the sampling accuracy.

[0036] The working principles of the signal acquisition module 140 and the second impedance adaptation module 150 in the embodiment of the present application are further described below in conjunction with the accompanying drawings.

[0037] Figure 5 FIG. 4 is a structural block diagram of a multi-channel signal compensation processing circuit according to a fourth embodiment of the present application. Figure 5 As shown, in the multi-channel signal compensation processing circuit, the signal acquisition module 140 includes a thermistor R1, a first capacitor C1, and a second resistor R2, and the thermistor R1 is respectively connected to the reference voltage terminal Vref and the fifth node N5; the first capacitor C1 is connected in parallel to the two ends of the second resistor R2; the second impedance adaptation module 150 includes a second operational amplifier V2, a third resistor R3, and a fourth resistor R4, the in-phase input terminal of the second operational amplifier V2 is connected to the fifth node N5, and the output terminal is connected to the second node N2; one end of the fourth resistor R4 is connected to the second node N2, and the other end is connected to the inverting input terminal of the second operational amplifier V2; one end of the third resistor R3 is connected to the inverting input terminal of the second operational amplifier V2, and the other end is connected to the ground terminal.

[0038] In this embodiment, the thermistor R1 is a sampling resistor, for example, it can be an NTC (Negative Temperature Coefficient) or a PTC (Positive Temperature Coefficient) thermistor. The first capacitor C1 can be a low-pass filter capacitor, and the high-frequency interference in the collected signal is filtered through the first capacitor C1 to eliminate the interference signal. Specifically, the thermistor R1 and the second resistor R2 form a voltage divider circuit. After the signal is divided by the second resistor R2, the divided signal outputs the voltage V0 through the negative feedback amplifier circuit formed by the second operational amplifier V2. Since the input stage impedance of the second operational amplifier V2 is infinite, it will not affect the input value; the output stage impedance is infinitely small, and there is no effect on the subsequent output circuit, so the second operational amplifier V2 can isolate the impedance mismatch problem between the input stage and the output stage, and plays the role of an intermediate buffer, that is, the second operational amplifier V2 can impedance match the circuit, improve the sampling accuracy, and at the same time improve the load capacity.

[0039] The following specifically describes the processing of the multi-channel signal compensation processing circuit using NTC as the thermistor.

[0040] It can be known that the higher the sampling temperature of the NTC is, the smaller the resistance of the NTC is, and the greater the voltage division of the second resistor R2 is.

[0041] First, the NTC collects the ambient temperature, converts the temperature signal into a resistance value, and inputs it into the in-phase input terminal of the second op amp V2 after voltage division by the second resistor R2. The inverting input terminal of the second op amp V2 is grounded through the third resistor R3. At this time, the gain of the second op amp V2 can be changed by adjusting the values ​​of the fourth resistor R4 and the third resistor R3. After the second op amp V2, the input voltage amplification factor is 1+R4 / R3. After that, the input voltage passes through the fifth resistor R5 and the reference voltage terminal Vref through the sixth resistor R6 to increase the DC component, thereby raising the voltage at the signal input terminal. The raised voltage signal is input to the first op amp V1. According to the property that the op amp input impedance is infinite and the output impedance is infinitely small, that is, the input current is 0, then the voltage input to the first op amp V1 Since the fifth resistor R5 and the sixth resistor R6 will reduce the voltage while increasing the DC component, while the fourth resistor R4 and the third resistor R3 can increase the voltage, it is possible to set R3 = R6 and R4 = R5, thereby achieving complementarity and improving sampling accuracy. This is equivalent to adding an offset to the output voltage V0 of the signal acquisition module 140. bAdjustment is performed to adjust the multi-channel temperature sampling values ​​to reach the preset sampling values ​​to achieve temperature compensation. After the signal of the third node N3 is negatively fed back by the first operational amplifier V1 and the first diode D1, the output voltage is V2+V f , and because the voltage drop of the first diode D1 and the second diode is the same, the voltage drop V is subtracted after passing through the second diode D2 f , keeping the output approximately unchanged.

[0042] In this embodiment, the compensation module 110 is described by taking temperature as a signal as an example. For example, by b Adjust the temperature difference compatible with different types of heat sinks and process the signals to the same level to facilitate signal comparison of each type. For further example, when the NTC sampling resistor (thermistor R1) and R2 are the same, if the temperature sampling at different NTC positions is different due to different air ducts and heating devices, the bias value V b Adjust to achieve temperature compensation. For example, a multi-channel signal compensation processing circuit includes two temperature sampling channels, one channel is 100°C for protection or other processing, and the other channel is 120°C for protection or other processing. Due to the difference in sampling values, the comparison result of the comparison circuit cannot effectively protect each channel temperature. At this time, the offset V b By making adjustments so that the 100°C sampling value reaches near the 120°C sampling value, effective protection processing for each temperature can be achieved.

[0043] In addition, based on the above embodiments, the present application also provides a power module. Figure 6 is a structural block diagram of a power module according to an embodiment of the present application, such as Figure 6 As shown, the power module includes a multi-channel signal compensation processing circuit and a filter module 160 according to any embodiment of the present application. The filter module 160 is connected to the first node N1 and the signal output terminal Vout.

[0044] Exemplarily, the signal output terminal Vout may be an AD port, for example. The power module may be an ACDC power conversion module, and the power module may be applied to a DC charging pile, an energy storage device, and the like.

[0045] In an exemplary embodiment, the filtering module 160 may include an eighth resistor R8, a third capacitor C3, and a ninth resistor R9, one end of the eighth resistor R8 is connected to the first node N1, and the other end is connected to the signal output terminal Vout; one end of the third capacitor C3 is connected to the signal output terminal Vout, and the other end is connected to the ground terminal; the ninth resistor R9 is connected in parallel to the two ends of the third capacitor 3.

[0046] In this embodiment, the signal output by the multi-channel signal compensation processing circuit is filtered and then sent to the signal output terminal Vout. Specifically, the signal is filtered through the eighth resistor R8 and the third capacitor C3, and the ninth resistor R9 can generally take a large value to perform electrostatic discharge or normal discharge on the third capacitor C3. It should be understood that the power module of the present application has the beneficial effects described in any of the above embodiments, which will not be repeated here.

[0047] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A multi-channel signal compensation processing circuit, characterized in that: include: A multi-channel signal comparison circuit, wherein the multi-channel signal comparison circuit is connected to form a first node; The signal comparison circuit comprises: A compensation module, wherein the input end and the output end are connected to the second node and the third node respectively, the compensation module is used to provide a DC component to the third node, and the second node is connected to the signal input end; A first impedance adaptation module, the input end and the output end of which are correspondingly connected to the third node and the fourth node; the first impedance adaptation module is used to match the output impedance of the third node; A selection module, an input end and an output end of which are connected to the fourth node and the first node respectively; the selection module is used to transmit the voltage signal of the fourth node to the first node.

2. The multi-channel signal compensation processing circuit according to claim 1, characterized in that: The output voltage of the selection module is the same as the input voltage of the first impedance adaptation module.

3. The multi-channel signal compensation processing circuit according to claim 1, characterized in that: The compensation module comprises: a fifth resistor, connecting the second node and the third node; a sixth resistor, connected to the reference voltage terminal and the third node; The first impedance adaptation module includes: A first operational amplifier, wherein a non-inverting input terminal is connected to the third node, and an output terminal is connected to the fourth node; The first diode has an anode connected to the fourth node and a cathode connected to the inverting input terminal of the first operational amplifier.

4. The multi-channel signal compensation processing circuit according to claim 3, characterized in that: The compensation module also includes: A second capacitor, one end of which is connected to the third node and the other end of which is connected to the ground; The selection module also includes: The second diode has an anode connected to the fourth node and a cathode connected to the first node.

5. The multi-channel signal compensation processing circuit according to claim 4, characterized in that: A tube voltage drop of the first diode is the same as a tube voltage drop of the second diode.

6. The multi-channel signal compensation processing circuit according to claim 1, characterized in that: The signal comparison circuit also includes: A signal acquisition module, wherein the input end and the output end are connected to the reference voltage end and the fifth node respectively, and the signal acquisition module is used to convert the collected temperature information into a preset voltage value and output it to the fifth node; The second impedance adaptation module has an input end and an output end correspondingly connected to the fifth node and the second node, and the second impedance adaptation module is used to match the output impedance of the fifth node.

7. The multi-channel signal compensation processing circuit according to claim 6, characterized in that: The signal acquisition module comprises: a thermistor, one end of which is connected to the reference voltage terminal, and the other end of which is connected to the fifth node; A second resistor, one end of which is connected to the fifth node, and the other end of which is connected to the ground; A first capacitor connected in parallel to both ends of the second resistor; The second impedance adaptation module includes: A second operational amplifier, having a non-inverting input terminal connected to the fifth node and an output terminal connected to the second node; a fourth resistor, one end of which is connected to the second node, and the other end of which is connected to the inverting input terminal of the second operational amplifier; A third resistor has one end connected to the inverting input terminal of the second operational amplifier and the other end connected to the ground terminal.

8. The multi-channel signal compensation processing circuit according to claim 7, characterized in that: The thermistor is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.

9. A power module, characterized in that: include: The multi-channel signal compensation processing circuit according to any one of claims 1 to 8; A filtering module is connected to the first node and the signal output end.

10. A power module according to claim 9, characterized in that: The filtering module comprises: an eighth resistor, one end of which is connected to the first node, and the other end of which is connected to the signal output end; A third capacitor, one end of which is connected to the signal output end, and the other end of which is connected to the ground end; The ninth resistor is connected in parallel to both ends of the third capacitor.

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