Signal acquisition circuit, multi-way valve position signal acquisition system

Abstract

The embodiments of the present application relate to a signal acquisition circuit and a multi-way valve position signal acquisition system, the circuit comprising: a positive input resistance module combination, a negative input resistance module combination, and an operational amplifier; the positive input resistance module combination receives an input first signal, and the positive input resistance module combination is connected to the positive input terminal of the operational amplifier; the negative input resistance module combination is connected to the negative input terminal of the operational amplifier; the resistance module includes an access resistor, and the resistance value of each access resistor corresponds to the type of the first signal; the operational amplifier and the access resistor constitute an operational amplifier circuit; the operational amplifier circuit is used to operationally amplify the first signal and output a second signal. The embodiments of the present application achieve the goal of fixing the resistance module in the circuit, and only the resistance value of the access resistor in the resistance module needs to be adjusted to adapt to various types of input signals, thereby improving the compatibility of the signal acquisition circuit and expanding the applicable scenarios of the circuit.

Description

Technical Field

[0001] The present application relates to the technical field of signal acquisition and processing, and in particular to a signal acquisition circuit and a multi-way valve position signal acquisition system. Background Art

[0002] With the development of electronic control technology, electronic control equipment can be used for automatic control in many fields. When the electronic control equipment is running, it is also necessary to collect signals from the electronic control equipment in real time to determine the operating status of the electronic control equipment. For example, an electronically controlled multi-way valve is a device used to control the direction, pressure, and flow of the fluid in a fluid system. During operation, the electronically controlled multi-way valve can feedback the status signal to the main control device in real time. The status signal indicates the current position of the valve core of the electronically controlled multi-way valve.

[0003] Existing signal acquisition circuits for electronically controlled equipment usually require the type and signal of the electronically controlled equipment to be determined in advance, and the signal acquisition circuit is adaptively designed according to the type of signal feedback from the electronically controlled equipment. The designed signal acquisition circuit can only be applied to specific types of signals, resulting in low versatility of the signal acquisition circuit, a narrow scope of application, and high design and manufacturing costs. Summary of the invention

[0004] In view of this, in order to solve some or all of the above-mentioned technical problems, the embodiments of the present application provide a signal acquisition circuit and a multi-way valve position signal acquisition system.

[0005] In the first aspect, an embodiment of the present application provides a signal acquisition circuit, which includes: a positive input resistance module combination, a negative input resistance module combination, and an operational amplifier; the positive input resistance module combination receives an input first signal, and the positive input resistance module combination is connected to the positive input terminal of the operational amplifier; the negative input resistance module combination is connected to the negative input terminal of the operational amplifier; the resistance module in the positive input resistance module combination and the resistance module in the negative input resistance module combination both include access resistors, and the resistance value of each access resistor corresponds to the type of the first signal; the operational amplifier and the access resistors in the positive input resistance module combination and the negative input resistance module combination constitute an operational amplifier circuit; the operational amplifier circuit is used to perform operational amplification on the first signal and output a second signal.

[0006] In one possible implementation, the resistance module in the positive input resistance module combination and the resistance module in the negative input resistance module combination both include a switch unit, the state of each switch unit corresponds to the type of the first signal, and each switch unit is used to control the corresponding access resistor to be connected to the operational amplifier circuit or to be isolated from the operational amplifier circuit.

[0007] In one possible embodiment, the signal acquisition circuit also includes a protection module, which includes a protection resistor and a protection diode. The protection resistor is arranged between the positive phase input resistor module combination and the positive phase input terminal, one end of the protection diode is connected to the positive phase input terminal, and the other end is connected to the power supply terminal of the first power supply, wherein the first power supply is used to power the operational amplifier.

[0008] In one possible embodiment, the protection diode includes a first diode and a second diode, the cathode of the first diode is connected to the voltage output terminal of the first power supply, and the anode of the first diode is connected to the positive input terminal; the cathode of the second diode is connected to the positive input terminal, and the anode of the second diode is connected to the ground terminal.

[0009] In one possible implementation, the positive input resistance module combination includes a first resistance module, a second resistance module, and a third resistance module; the negative input resistance module combination includes a fourth resistance module, a fifth resistance module, and a sixth resistance module; one end of the first resistance module receives the first signal, and the other end is connected to the positive input end; one end of the second resistance module is connected to the voltage output end of the second power supply, and the other end is connected to the positive input end; one end of the third resistance module is connected to the ground end, and the other end is connected to the positive input end. One end of the fourth resistance module is connected to the voltage output end of the first power supply, and the other end is connected to the negative input end; one end of the fifth resistance module is connected to the ground end, and the other end is connected to the negative input end; one end of the sixth resistance module is connected to the negative input end, and the other end is connected to the output end of the operational amplifier.

[0010] In one possible implementation, when the first signal is a voltage-type pulse signal, the access resistors respectively included in the first resistance module, the third resistance module, the fourth resistance module and the fifth resistance module are connected to the operational amplifier circuit; the access resistors respectively included in the second resistance module and the sixth resistance module are isolated from the operational amplifier circuit.

[0011] In one possible implementation, when the first signal is a current-type pulse signal, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistors included in the third resistor module, the fourth resistor module and the fifth resistor module are respectively connected to the operational amplifier circuit; and the access resistors included in the second resistor module and the sixth resistor module are respectively isolated from the operational amplifier circuit.

[0012] In one possible embodiment, when the first resistor module combination is connected to the external potentiometer, if the external potentiometer is powered by power, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistors included in the third resistor module and the sixth resistor module are respectively connected to the operational amplifier circuit; the access resistors included in the second resistor module, the fourth resistor module, and the fifth resistor module are respectively isolated from the operational amplifier circuit, and the first signal is the voltage signal after the external potentiometer and the access resistor included in the second resistor module are divided; if the external potentiometer is not powered by power, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistors included in the second resistor module and the sixth resistor module are respectively connected to the operational amplifier circuit; the access resistors included in the third resistor module, the fourth resistor module, and the fifth resistor module are respectively isolated from the operational amplifier circuit, and the first signal is the voltage signal after the access resistor included in the second resistor module and the external potentiometer are divided.

[0013] In one possible implementation, when the first signal is a continuous voltage signal, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistor included in the sixth resistor module is connected to the operational amplifier circuit; the access resistors included in the second resistor module, the third resistor module, the fourth resistor module, and the fifth resistor module are respectively isolated from the operational amplifier circuit.

[0014] In the second aspect, an embodiment of the present application provides a multi-way valve position signal acquisition system, the system comprising: a multi-way valve, a controller and the signal acquisition circuit described in any embodiment of the first aspect above, the multi-way valve, the controller and the signal acquisition circuit are connected in series in sequence; the multi-way valve includes a valve core position feedback device, the valve core position feedback device is used to sense the position of the valve core, and output a first signal representing the position of the valve core; the signal acquisition circuit is used to collect the first signal and generate a second signal, and input the second signal into the controller; the controller is used to identify the second signal to determine the current position of the valve core of the multi-way valve.

[0015] The signal acquisition circuit and multi-way valve position signal acquisition system provided by the embodiments of the present application are provided by setting a positive input resistance module combination, a negative input resistance module combination and an operational amplifier. The positive input resistance module combination and the negative input resistance module combination are respectively connected to the positive input terminal and the negative input terminal of the operational amplifier. Each resistance module includes an access resistor. The resistance value of each access resistor corresponds to the type of the input first signal. The operational amplifier and the access resistors in the positive input resistance module combination and the negative input resistance module combination constitute an operational amplifier circuit. The operational amplifier circuit performs operational amplification on the first signal and outputs the second signal. The embodiments of the present application realize that the resistance module in the circuit is fixed. It only needs to adjust the resistance value of the access resistor in the resistance module to adapt to various types of input signals, thereby improving the compatibility of the signal acquisition circuit, expanding the applicable scenarios of the circuit, and improving the convenience of circuit design and debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 A schematic diagram of the structure of a signal acquisition circuit provided in an embodiment of the present application;

[0020] Figure 2 A structural schematic diagram of another signal acquisition circuit provided in an embodiment of the present application;

[0021] Figure 3 A structural schematic diagram of another signal acquisition circuit provided in an embodiment of the present application;

[0022] Figure 4 A structural schematic diagram of another signal acquisition circuit provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of a signal acquisition circuit suitable for voltage-type pulse signals provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of the structure of a signal acquisition circuit suitable for current-type pulse signals provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of a signal acquisition circuit provided in an embodiment of the present application and applicable to a case where an external potentiometer is powered by a power supply;

[0026] Figure 8 A schematic diagram of the structure of a signal acquisition circuit provided in an embodiment of the present application that is suitable for a case where an external potentiometer has no power supply;

[0027] Fig. 9 A schematic diagram of the structure of a signal acquisition circuit suitable for continuous voltage signals provided in an embodiment of the present application;

[0028] Fig.10 A schematic diagram of the structure of a multi-way valve position signal acquisition system provided in an embodiment of the present application.

[0029] Reference numerals:

[0030] 100-signal acquisition circuit; 101-positive phase input resistance module combination; 102-negative phase input resistance module combination; 103-operational amplifier; 104-protection module; 1000-multi-way valve position signal acquisition system; 1001-multi-way valve; 1002-controller. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the numerical expressions and the numerical values ​​described in these embodiments do not limit the scope of the present application.

[0032] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of the present application are only used to distinguish between different steps, devices, modules and other objects, and do not represent any specific technical meanings, nor do they indicate the logical order between them.

[0033] It should also be understood that in this embodiment, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0034] It should also be understood that any component, data or structure mentioned in the embodiments of the present application can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0035] In addition, the term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0036] It should also be understood that the description of the various embodiments in this application focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0037] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0038] Technologies, circuits, and devices known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the above-mentioned technologies, circuits, and devices should be considered as part of the specification.

[0039] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0040] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. To facilitate the understanding of the embodiments of the present application, the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0041] Figure 1 A structural schematic diagram of a signal acquisition circuit provided in an embodiment of the present application, the circuit can be applied to various sensor signal acquisition systems, such as a thermal management system on a vehicle, to collect multi-way valve position signals; or to collect temperature, pressure and other signals.

[0042] The signal acquisition circuit 100 includes: a positive phase input resistance module combination 101, a negative phase input resistance module combination 102, and an operational amplifier 103. Each resistance module in the positive phase input resistance module combination 101 and the negative phase input resistance module may include one or more resistors, or may include other components such as switches and interfaces.

[0043] In this embodiment, if Figure 1 As shown, the positive phase input resistor module assembly 101 receives the input first signal and is connected to the positive phase input terminal of the operational amplifier 103. The negative phase input resistor module assembly 102 is connected to the negative phase input terminal of the operational amplifier 103.

[0044] The first signal may be a signal collected by various types of sensors for the monitored device. For example, the monitored device may be a multi-way valve, and the first signal may be a signal indicating the position of the valve core fed back by the multi-way valve.

[0045] The resistance module in the positive phase input resistance module combination 101 and the resistance module in the negative phase input resistance module combination 102 both include access resistors, and the resistance value of each access resistor corresponds to the type of the first signal.

[0046] Specifically, the resistance value range of the access resistor can be 0-infinity, that is, when the resistance value is 0 ohms, the two ends of the access resistor are short-circuited, and when the resistance value of the access resistor is infinite, the two ends of the resistor are open-circuited. Therefore, each installation position of the access resistor can be installed with a resistor of a specific resistance value, or no resistor can be installed to make it equivalent to an infinite resistance; or, the access resistor can be connected in series or in parallel with a switch, and the switch can control the access resistor to be short-circuited or open-circuited with the entire circuit.

[0047] In this embodiment, the operational amplifier 103 and the connected resistors in the positive phase input resistor module combination 101 and the negative phase input resistor module combination 102 form an operational amplifier circuit. The operational amplifier circuit is used to perform operational amplification on the first signal and output a second signal. Figure 1 VCC1 in the figure represents the power supply voltage of the operational amplifier 103. The second signal outputted can be inputted into a device having a logic processing function (eg, an MCU) to record the state of the monitored device in real time according to the second signal.

[0048] Specifically, since the resistance value of the access resistor in each resistor module can be adjusted arbitrarily, when the installation position of each resistor module is fixed, that is, when the printed circuit board is not changed, the function of the operational amplifier circuit can be changed by adjusting the resistance value of the access resistor. Figure 1 If the resistance of the resistor connected between the output terminal and the inverting input terminal of the operational amplifier 103 is infinite, that is, open circuit, the operational amplifier circuit can be used as a comparator; if only one resistor is connected between the output terminal and the inverting input terminal of the operational amplifier 103, the operational amplifier circuit can be used as a voltage follower.

[0049] The signal acquisition circuit provided by the embodiment of the present application is provided with a positive input resistance module combination, a negative input resistance module combination and an operational amplifier. The positive input resistance module combination and the negative input resistance module combination are respectively connected to the positive input terminal and the negative input terminal of the operational amplifier. Each resistance module includes an access resistor. The resistance value of each access resistor corresponds to the type of the input first signal. The operational amplifier and the access resistors in the positive input resistance module combination and the negative input resistance module combination constitute an operational amplifier circuit. The operational amplifier circuit performs operational amplification on the first signal and outputs a second signal. The embodiment of the present application realizes fixing the resistance module in the circuit. It only needs to adjust the resistance value of the access resistor in the resistance module to adapt to various types of input signals, thereby improving the compatibility of the signal acquisition circuit, expanding the applicable scenarios of the circuit, and improving the convenience of circuit design and debugging.

[0050] In some optional implementations of the present embodiment, the resistance module in the positive input resistance module combination 101 and the resistance module in the negative input resistance module combination 102 both include a switch unit, the state of each switch unit corresponds to the type of the first signal, and each switch unit is used to control the corresponding access resistor to be connected to the operational amplifier circuit or to be isolated from the operational amplifier circuit.

[0051] like Figure 2 As shown, M1-M6 are six resistance modules, each of which includes an access resistor and a switch unit. By changing the closed or open state of the switch unit, the access resistor and the circuit short circuit or open circuit can be adjusted accordingly. For example, Figure 2 The resistor R1 is connected in parallel with a switch unit S1. When S1 is disconnected, R1 is connected to the circuit, and when S1 is turned on, R1 is short-circuited; the other resistors are connected in series with a switch unit respectively. When the switch is turned on, the resistor is connected to the circuit, and when the switch is disconnected, the resistor is disconnected from the circuit.

[0052] Optionally, each switch unit in the circuit can be a manually controlled switch or an electrically controlled switch. When an electrically controlled switch is adopted, analog switch elements such as triodes and field effect transistors can be used, and the state of the switch can be controlled by a controller.

[0053] Optionally, a capacitor (such as ) may be provided between the first input signal and the ground terminal, between the second output signal and the ground terminal, and between the inverting input terminal of the operational amplifier 103 and the ground terminal. Figure 2 In addition, a resistor (such as C1, C2, C3) can be connected to the output end of the operational amplifier 103 to filter out the clutter signal. Figure 2 This resistor can limit the output current to prevent damage to the external controller.

[0054] This embodiment achieves flexible control over the access state of the access resistor by providing a switch unit in the resistor module, thereby helping to improve the convenience of using the circuit.

[0055] In some optional implementations of this embodiment, such as Figure 3 As shown, the signal acquisition circuit also includes a protection module 104, which includes a protection resistor Rp and a protection diode D1. The protection resistor Rp is arranged between the positive phase input resistor module combination 101 and the positive phase input terminal, and one end of the protection diode D1 is connected to the positive phase input terminal, and the other end is connected to the power supply end of the first power supply, wherein the first power supply is used to power the operational amplifier 103.

[0056] Typically, the output voltage value VCC1 of the first power supply matches the supply voltage of the controller connected to the output end of the circuit. If the operational amplifier 103 outputs an amplified signal, VCC1 can output the highest voltage, thereby adapting to the input voltage range of the controller.

[0057] like Figure 3 As shown, the anode of D1 is connected to the non-inverting input terminal of the operational amplifier 103, and the cathode is connected to VCC1. D1 and Rp form a protection circuit to prevent the input signal voltage from being too large, and the voltage can be clamped at VCC1+V D1 , where V D1 is the conduction voltage drop of D1. The function of the protection resistor Rp is to limit the current and prevent the current passing through the protection diode from being too large.

[0058] This embodiment can prevent the excessive voltage of the input signal from affecting various components in the circuit by providing a protection module on the path of the input first signal, thereby improving the safety and stability of the circuit.

[0059] In some optional implementations of this embodiment, such as Figure 4 As shown, the protection diode includes a first diode D11 and a second diode D12, the cathode of the first diode is connected to the voltage output terminal of the first power supply, and the anode of the first diode is connected to the positive input terminal; the cathode of the second diode is connected to the positive input terminal, and the anode of the second diode is connected to the ground terminal.

[0060] Specifically, when the voltage of the input first signal is too high in the positive direction, D11 is turned on, and the voltage of the non-inverting input terminal of the operational amplifier 103 is clamped at VCC1+V D11 When the voltage of the first input signal is too low, causing the voltage at the non-inverting input terminal of the operational amplifier 103 to be less than 0, D12 is turned on, and the voltage at the non-inverting input terminal of the operational amplifier 103 is clamped at -V D12 Among them, V D11 is the on-state voltage of D11, V D12 is the on-state voltage of D12.

[0061] This embodiment provides two protection diodes to prevent the voltage of the input signal from being too large in both the positive and negative directions and causing damage to various components in the circuit, thereby improving the safety and stability of the circuit.

[0062] In some optional implementations of this embodiment, such as Figure 2 As shown, the positive phase input resistance module combination 101 includes a first resistance module M1, a second resistance module M2, and a third resistance module M3; the negative phase input resistance module combination 102 includes a fourth resistance module M4, a fifth resistance module M5, and a sixth resistance module M6.

[0063] in, Figure 2 Each resistor module in the circuit shown includes an access resistor and a switch unit (i.e., R1-R6, S1-S6 in the figure). It should be noted that the resistor module may not include a switch unit, and the equivalent function of the switch unit can be achieved by removing the resistor from the welding position or setting a 0 ohm resistor.

[0064] One end of the first resistor module receives the first signal, and the other end is connected to the positive phase input terminal. One end of the second resistor module is connected to the voltage output terminal (VCC2) of the second power supply, and the other end is connected to the positive phase input terminal. One end of the third resistor module is connected to the ground terminal, and the other end is connected to the positive phase input terminal.

[0065] It should be understood that the first resistor module M1, the second resistor module M2, the third resistor module M3 and the non-inverting input terminal of the operational amplifier 103 can be directly connected, or indirectly connected to the non-inverting input terminal through the protection circuit described in the above embodiment.

[0066] One end of the fourth resistor module is connected to the voltage output terminal of the first power supply, and the other end is connected to the inverting input terminal. One end of the fifth resistor module is connected to the ground terminal, and the other end is connected to the inverting input terminal. One end of the sixth resistor module is connected to the inverting input terminal, and the other end is connected to the output terminal of the operational amplifier 103.

[0067] This embodiment sets six resistance modules and connects them in combination with operational amplifiers, so as to flexibly change the connection state of the access resistors in each resistance module and form various types of operational amplifier circuits with the operational amplifiers, thereby making the structure of the circuit more concise and the circuit configuration more flexible.

[0068] In some optional implementations of the present embodiment, when the first signal is a voltage-type pulse signal, the access resistors respectively included in the first resistance module, the third resistance module, the fourth resistance module and the fifth resistance module are connected to the operational amplifier circuit.

[0069] The access resistors respectively included in the second resistance module and the sixth resistance module are isolated from the operational amplifier circuit.

[0070] Specifically, in Figure 2 In the circuit shown, S1, S2, and S6 are disconnected, and S3, S4, and S5 are closed. The equivalent circuit formed is as follows: Figure 5 As shown, Figure 5The above-mentioned protection resistor and protection diode are included. That is, resistors R1, R3, R4, R5 are connected to the operational amplifier 103 to form an operational amplifier circuit. The operational amplifier circuit realizes the function of a comparator, that is, VCC1 is divided according to the ratio of R4 and R5, and the inverting input voltage as the reference voltage of the comparator is input to the operational amplifier 103. After the voltage of the input first signal is divided by R1 and R3, the positive input voltage is input to the operational amplifier 103. When the positive input voltage of the operational amplifier 103 is greater than the inverting input voltage, the voltage of the output second signal is VCC2, and vice versa, when the positive input voltage is less than the inverting input voltage, the voltage of the output second signal is 0.

[0071] When the first signal is a voltage pulse signal, the circuit provided in this embodiment can be used to convert the first signal into a square wave signal that matches the input voltage of the external controller. Based on the square wave signal, corresponding monitoring functions can be implemented. For example, the valve core position of the multi-way valve can be determined by counting the edges of the square wave signal.

[0072] This embodiment forms a comparator by changing the access mode of each resistance module and the operational amplifier, so that the circuit can respond to a voltage pulse signal and match the input voltage of the receiving end of the output signal, thereby improving the use flexibility of the circuit.

[0073] In some optional implementations of the present embodiment, when the first signal is a current-type pulse signal, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistors included in the third resistor module, the fourth resistor module and the fifth resistor module are respectively connected to the operational amplifier circuit; the access resistors included in the second resistor module and the sixth resistor module are respectively isolated from the operational amplifier circuit.

[0074] Specifically, in Figure 2 In the circuit shown, S2 and S6 are disconnected, and S1, S3, S4, and S5 are closed. The equivalent circuit formed is as follows: Figure 6 As shown. R3 is used for current matching, that is, the current of the first input signal passes through R3 to the ground terminal, and the voltage at one end of R3 is proportional to the current signal. Figure 5 The principle of the circuit shown is similar. When the positive input voltage of the operational amplifier 103 is greater than the negative input voltage, the voltage of the output second signal is VCC2. Conversely, when the positive input voltage is less than the negative input voltage, the voltage of the output second signal is 0.

[0075] When the first signal is a current pulse signal, the circuit provided in this embodiment can be used to convert the current signal into a square wave signal that matches the input voltage of the external controller. Based on the square wave signal, corresponding monitoring functions can be implemented. For example, the valve core position of the multi-way valve can be determined by counting the edges of the square wave signal.

[0076] This embodiment forms a current-to-voltage circuit and a comparator by changing the access method of each resistance module and the operational amplifier, so that the circuit can respond to a current pulse signal and match the input voltage of the receiving end of the output signal, thereby improving the flexibility of use of the circuit.

[0077] In some optional implementations of the present embodiment, when the first resistor module combination is connected to an external potentiometer, if the external potentiometer is powered by a power supply, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistors included in the third resistor module and the sixth resistor module are respectively connected to the operational amplifier circuit; the access resistors included in the second resistor module, the fourth resistor module, and the fifth resistor module are respectively isolated from the operational amplifier circuit, and the first signal is a voltage signal after the external potentiometer and the access resistor included in the second resistor module are divided.

[0078] Specifically, in Figure 2 In the circuit shown, S2, S4, and S5 are disconnected, and S1, S3, and S6 are closed. The equivalent circuit formed is as follows: Figure 7 As shown. VCC3 is the power supply voltage of the power supply of the external potentiometer AR. The external potentiometer and R3 divide the voltage of VCC3, and the first signal is the continuous voltage signal after the voltage division. R6 and the operational amplifier 103 form a voltage follower, and the first signal is isolated from the outside world through the follower, and the voltage of the output second signal is the same as the voltage of the first signal.

[0079] If the external potentiometer has no power supply, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistors included in the second resistor module and the sixth resistor module are respectively connected to the operational amplifier circuit; the access resistors included in the third resistor module, the fourth resistor module, and the fifth resistor module are respectively disconnected from the operational amplifier circuit, and the first signal is a voltage signal after the access resistor included in the second resistor module and the external potentiometer are divided.

[0080] Specifically, in Figure 2 In the circuit shown, S3, S4, and S5 are disconnected, and S1, S2, and S6 are closed. The equivalent circuit formed is as follows: Figure 8 As shown. R2 and the external potentiometer divide the voltage of VCC2, and the first signal is the continuous voltage signal after the voltage division. R6 and the operational amplifier 103 form a voltage follower, and the voltage of the output second signal is the same as the voltage of the first signal.

[0081] In this embodiment, the output second signal is a continuous voltage signal. Therefore, the device receiving the second signal can collect the voltage value of the second signal through an analog-to-digital converter.

[0082] This embodiment adaptively adjusts the connection relationship between each resistance module and the operational amplifier according to whether the potentiometer is connected to an external power supply when the external potentiometer is connected. This achieves that when the potentiometer is used as a sensing device, the circuit structure can be flexibly adjusted and the signal sensed by the potentiometer can be accurately collected, thereby improving the flexibility of use of the circuit.

[0083] In some optional implementations of the present embodiment, when the first signal is a continuous voltage signal, the two ends of the access resistor included in the first resistance module are short-circuited; the access resistor included in the sixth resistance module is connected to the operational amplifier circuit; the access resistors included in the second resistance module, the third resistance module, the fourth resistance module, and the fifth resistance module are respectively isolated from the operational amplifier circuit.

[0084] Specifically, in Figure 2 In the circuit shown, S2, S3, S4, and S5 are disconnected, and S1 and S6 are closed. The equivalent circuit formed is as follows: Fig. 9 The first signal is a continuous voltage signal, which is directly input to the non-inverting input terminal of the operational amplifier 103. R6 and the operational amplifier 103 form a voltage follower, and the voltage of the output second signal is the same as the voltage of the first signal.

[0085] This embodiment realizes direct collection of continuous voltage signals by adaptively adjusting the connection relationship between each resistance module and the operational amplifier when the input signal is a continuous voltage signal, thereby improving the use flexibility of the circuit.

[0086] Fig.10 A schematic diagram of a multi-way valve position signal acquisition system 1000 provided in an embodiment of the present application is shown in FIG. Fig.10 As shown, the system specifically includes: a multi-way valve 1001, a controller 1002 and a signal acquisition circuit 100 described in any one of the above embodiments.

[0087] The multi-way valve 1001, the controller 1002 and the signal acquisition circuit 1003 are connected in series in sequence.

[0088] The multi-way valve 1001 includes a valve core position feedback device, which is used to sense the position of the valve core and output a first signal indicating the position of the valve core.

[0089] Generally, different types of multi-way valves 1001 output different types of first signals. The multi-way valve 1001 can sense the position of the valve core through a Hall sensor, a potentiometer, etc., and the type of the first signal output can be a voltage pulse signal, a current pulse signal, a continuous voltage signal, etc.

[0090] The signal acquisition circuit 1003 is used to acquire the first signal, generate a second signal, and input the second signal into the controller 1002. The controller 1002 is used to identify the second signal to determine the current position of the valve core of the multi-way valve 1001.

[0091] The access resistor in the resistor module included in the signal acquisition circuit 1003 can set a corresponding resistance value according to the type of the first signal and output a second signal matching the type. The controller 1002 can determine the current position of the valve core of the multi-way valve 1001 by counting pulse edges, calculating duty cycle, calculating voltage value, etc.

[0092] The multi-way valve position signal acquisition system provided in the embodiment of the present application realizes the position feedback signal compatible with various types of multi-way valves by applying the above-mentioned signal acquisition circuit. There is no need to change the circuit design for a specific type of multi-way valve, and only the connection method of the resistance module needs to be adjusted accordingly. This reduces the development difficulty and cost of systems using multi-way valves in various scenarios, shortens the development cycle, and expands the use scenarios.

[0093] Optionally, the multi-way valve position signal acquisition system provided in this embodiment can be applied in an automotive thermal management system. At present, technologies such as heat pump technology and heat recovery technology have begun to be widely used in automotive thermal management systems to improve the overall performance of the system. At the same time, the system has become more complex and the control requirements for the system have become higher. Among them, there are many types of position signals of multi-way valves. The traditional development model is to first determine the multi-way valve model and then develop the control circuit, which results in the circuit being generally a dedicated circuit that can only support the acquisition of one signal. The multi-way valve position signal acquisition system provided in this embodiment can be compatible with a variety of multi-way valve models. According to the type of multi-way valve feedback signal, the connection method of the resistance module can be adjusted. This reduces the development difficulty and cost of the automotive thermal management system and shortens the development cycle.

[0094] Optionally, the type of the valve core position feedback device is any one of the following: a voltage type Hall sensor, a current type Hall sensor, a potentiometer type Hall sensor, a pulse width modulation type three-dimensional Hall sensor, and a digital-to-analog conversion type three-dimensional Hall sensor.

[0095] In this embodiment, when the valve core position feedback device is a voltage-type Hall sensor, or a pulse width modulation three-dimensional Hall sensor, the first signal is a voltage-type pulse signal, and the structure of the positive input resistance module combination and the negative input resistance module combination in the signal acquisition circuit is set to match the voltage-type pulse signal.

[0096] Specifically, when the magnetic flux density around the voltage-type Hall sensor exceeds a certain preset threshold, the sensor detects it and generates an output voltage called the Hall voltage. When the magnetic field perpendicular to the Hall sensor exceeds the preset threshold, the output of the Hall sensor is low, and when the magnetic field decreases below the release point, the device output becomes high.

[0097] The working principle of the three-dimensional Hall sensor is to use a planar Hall sensor to convert the magnetic field component perpendicular to the chip surface into voltage, and then convert the signal from the Hall sensor through amplification and filtering, and then convert it into a digital converter, and use the CORDIC algorithm to process it to calculate the angle and size of the magnetic field vector. Finally, the processed output pulse width modulation signal (PWM) representing the position of the valve core or the continuous voltage signal output by the analog-to-digital converter is output. The pulse width modulation type three-dimensional Hall sensor can output a PWM signal.

[0098] Since both the voltage type Hall sensor and the pulse width modulation type three-dimensional Hall sensor can output voltage type pulse signals, the corresponding signal acquisition circuit can be used Figure 5 The circuit shown.

[0099] In this embodiment, when the valve core position feedback device is a current type Hall sensor, the first signal is a current type pulse signal, and the structure of the positive phase input resistance module combination and the negative phase input resistance module combination is set to match the current type pulse signal.

[0100] Specifically, the above-mentioned current type Hall sensor includes a control current IC. When a magnetic field passes through the magnetic sensing surface of the device, a Hall potential appears at the output end. The magnitude of the Hall potential VH is proportional to the product of the control current IC and the magnetic flux density B. When the magnetic field perpendicular to the Hall element exceeds the operating point threshold, the current type Hall sensor outputs a high current. When the magnetic field drops below the release point, the device outputs a low current. At this time, the above-mentioned Figure 6 The circuit shown acquires a current signal.

[0101] In this embodiment, when the valve core position feedback device is a potentiometer type Hall sensor or a digital-to-analog conversion type three-dimensional Hall sensor, the first signal is a continuous voltage signal, and the structure of the positive input resistance module combination and the negative input resistance module combination is set to match the continuous voltage signal.

[0102] Specifically, the working principle of the potentiometer type Hall sensor is based on the resistance change of the potentiometer. It is mainly composed of a resistor and a movable brush. When a voltage is applied between the two fixed contacts of the resistor, the position of the contacts on the resistor is changed by rotating or sliding the system, and a continuous voltage signal with a certain relationship to the position of the moving contact can be obtained between the moving contact and the fixed contact. The continuous voltage signal corresponds to the position of the valve core. Depending on whether the potentiometer in the potentiometer type Hall sensor has access to a power supply, select the above Figure 7 or Figure 8 The circuit shown is used for signal acquisition.

[0103] The principle of the digital-to-analog conversion type 3D Hall sensor is similar to that of the pulse width modulation type 3D Hall sensor mentioned above, except that the output signal is a continuous voltage signal after digital-to-analog conversion. Fig. 9 The circuit shown is used for signal acquisition.

[0104] The professionals should further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different circuits to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0105] The steps of the circuits or algorithms described in conjunction with the embodiments disclosed herein may be implemented using hardware, software modules executed by a processor, or a combination of the two. The software modules may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0106] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0107] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A signal acquisition circuit, characterized in that: The circuit comprises: a positive phase input resistance module combination, a negative phase input resistance module combination, and an operational amplifier; The positive phase input resistance module combination receives an input first signal, and the positive phase input resistance module combination is connected to the positive phase input terminal of the operational amplifier; The inverting input resistance module combination is connected to the inverting input terminal of the operational amplifier; The resistance module in the positive input resistance module combination and the resistance module in the negative input resistance module combination both include access resistors, and the resistance value of each access resistor corresponds to the type of the first signal; The operational amplifier, the positive phase input resistance module combination, and the access resistor in the negative phase input resistance module combination constitute an operational amplifier circuit; The operational amplifier circuit is used to perform operational amplification on the first signal and output a second signal; The positive phase input resistance module combination includes a first resistance module, a second resistance module, and a third resistance module; the negative phase input resistance module combination includes a fourth resistance module, a fifth resistance module, and a sixth resistance module; One end of the first resistor module receives the first signal, and the other end is connected to the non-inverting input end; One end of the second resistance module is connected to the voltage output end of the second power supply, and the other end is connected to the non-phase input end; One end of the third resistor module is connected to the ground terminal, and the other end is connected to the non-phase input terminal; One end of the fourth resistor module is connected to the voltage output end of the first power supply, and the other end is connected to the inverting input end; One end of the fifth resistor module is connected to the ground terminal, and the other end is connected to the inverting input terminal; One end of the sixth resistor module is connected to the inverting input terminal, and the other end is connected to the output terminal of the operational amplifier; The resistance module in the positive input resistance module combination and the resistance module in the negative input resistance module combination both include a switch unit, the state of each switch unit corresponds to the type of the first signal, and each switch unit is used to control the corresponding access resistor to be connected to the operational amplifier circuit or to be isolated from the operational amplifier circuit.

2. The circuit according to claim 1, characterized in that The signal acquisition circuit also includes a protection module, which includes a protection resistor and a protection diode. The protection resistor is arranged between the positive phase input resistor module combination and the positive phase input terminal. One end of the protection diode is connected to the positive phase input terminal, and the other end is connected to the power supply terminal of the first power supply, wherein the first power supply is used to power the operational amplifier.

3. The circuit according to claim 2, characterized in that The protection diode includes a first diode and a second diode, the cathode of the first diode is connected to the voltage output end of the first power supply, and the anode of the first diode is connected to the positive input end; the cathode of the second diode is connected to the positive input end, and the anode of the second diode is connected to the ground end.

4. The circuit according to claim 1, characterized in that When the first signal is a voltage-type pulse signal, the access resistors respectively included in the first resistance module, the third resistance module, the fourth resistance module and the fifth resistance module are connected to the operational amplifier circuit; The access resistors respectively included in the second resistance module and the sixth resistance module are isolated from the operational amplifier circuit.

5. The circuit according to claim 1, characterized in that When the first signal is a current-type pulse signal, two ends of the access resistor included in the first resistor module are short-circuited; The access resistors respectively included in the third resistance module, the fourth resistance module and the fifth resistance module are connected to the operational amplifier circuit; The access resistors respectively included in the second resistance module and the sixth resistance module are isolated from the operational amplifier circuit.

6. The circuit according to claim 1, characterized in that When the first resistor module combination is connected to the external potentiometer, if the external potentiometer is powered by a power supply, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistors respectively included in the third resistor module and the sixth resistor module are connected to the operational amplifier circuit; the access resistors respectively included in the second resistor module, the fourth resistor module, and the fifth resistor module are isolated from the operational amplifier circuit, and the first signal is a voltage signal after the external potentiometer and the access resistors included in the second resistor module are divided; If the external potentiometer has no power supply, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistors included in the second resistor module and the sixth resistor module are respectively connected to the operational amplifier circuit; the access resistors included in the third resistor module, the fourth resistor module, and the fifth resistor module are respectively disconnected from the operational amplifier circuit, and the first signal is a voltage signal obtained by dividing the access resistor included in the second resistor module and the external potentiometer.

7. The circuit according to claim 1, characterized in that When the first signal is a continuous voltage signal, the two ends of the access resistor included in the first resistor module are short-circuited; the access resistor included in the sixth resistor module is connected to the operational amplifier circuit; the access resistors respectively included in the second resistor module, the third resistor module, the fourth resistor module, and the fifth resistor module are isolated from the operational amplifier circuit.

8. A multi-way valve position signal acquisition system, characterized in that: The system comprises: a multi-way valve, a controller and a signal acquisition circuit according to any one of claims 1 to 7, wherein the multi-way valve, the controller and the signal acquisition circuit are connected in series in sequence; The multi-way valve includes a valve core position feedback device, which is used to sense the position of the valve core and output a first signal indicating the position of the valve core; The signal acquisition circuit is used to acquire the first signal, generate a second signal, and input the second signal into the controller; The controller is used to identify the second signal to determine the current position of the valve core of the multi-way valve.

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