Multi-type signal acquisition device

Abstract

The invention relates to a multi-type signal acquisition device. The control circuit is used for acquiring an externally input mode configuration instruction, generating a mode switching signal according to the mode configuration instruction, and transmitting the mode switching signal to the switching circuit; the switching circuit is used for generating a switch driving signal according to the mode switching signal and transmitting the switch driving signal to the multi-type signal access circuit; the multi-type signal access circuit is used for switching a circuit acquisition mode according to a switch driving signal; an external acquisition signal is accessed, and the external acquisition signal is transmitted to the control circuit; and the control circuit is also used for determining signal parameters according to external acquisition signals. Through the multi-type signal acquisition device, acquisition of multiple signal types is realized, and the flexibility of data acquisition is improved. And the same multi-type signal acquisition device is used for different signal types, so that the cost is further reduced.

Description

Technical Field

[0001] This application relates to the technical field of signal acquisition, and particularly to a multi-type signal acquisition device. Background Art

[0002] With the development of technology, various electrical products, electrical equipment, and power-consuming devices such as new energy vehicles have become more and more popular in each family. For power-consuming devices, it is crucial to ensure their normal operation, extend their service life, and prevent potential safety risks. By monitoring the voltage, current, and temperature of power-consuming devices in real time, the safety of power-consuming devices can be improved. Through voltage monitoring, abnormal voltage fluctuations can be detected in a timely manner, and corresponding protection measures can be taken, such as automatic power-off protection, to prevent power-consuming devices from being damaged. Through current monitoring, too high current means there is a short circuit or other faults inside the power-consuming device, and too low current indicates poor contact or insufficient load. These problems can be detected and solved in a timely manner through current monitoring. Through temperature monitoring, too high temperature can accelerate material aging and even cause a fire in severe cases. These problems can be detected and solved in a timely manner through temperature monitoring.

[0003] In the current related technologies, for voltage, current, and temperature, different signal acquisition circuits are respectively required for data acquisition, which is not flexible to use; and signal acquisition circuits need to be designed separately for voltage, current, and temperature, resulting in a relatively high cost. Summary of the Invention

[0004] Based on this, it is necessary to provide a multi-type signal acquisition device for the above technical problems.

[0005] This application provides a multi-type signal acquisition device, which includes: a multi-type signal access circuit, a control circuit, and a switching circuit; the control circuit is respectively connected to the switching circuit and the multi-type signal access circuit, and is used to obtain a mode configuration instruction input from the outside, generate a mode switching signal according to the mode configuration instruction, and transmit the mode switching signal to the switching circuit; the switching circuit is connected to the multi-type signal access circuit, and is used to generate a switch drive signal according to the mode switching signal and transmit the switch drive signal to the multi-type signal access circuit; the multi-type signal access circuit is used to switch the circuit acquisition mode according to the switch drive signal; access an external acquisition signal and transmit the external acquisition signal to the control circuit; the multi-type signal access circuit includes multiple circuit acquisition modes, and the multiple circuit acquisition modes correspond to different types of external acquisition signals; the control circuit is further used to determine signal parameters according to the external acquisition signal.

[0006] In one embodiment, the multi-type signal access circuit includes: a mode conversion circuit and a filtering circuit; the mode conversion circuit is connected to the filtering circuit and the switching circuit, and is configured to switch the circuit acquisition mode according to the switch driving signal; access an external acquisition signal and transmit the external acquisition signal to the filtering circuit; the filtering circuit is connected to the control circuit, and is configured to filter the external acquisition signal and transmit the filtered external acquisition signal to the control circuit.

[0007] In one embodiment, the mode conversion circuit includes: a first resistor switch circuit, a second resistor switch circuit, a third resistor switch circuit, a fourth resistor switch circuit, a fifth resistor switch circuit, and a first capacitor; the first resistor switch circuit, the second resistor switch circuit, and the third resistor switch circuit are connected in parallel, the first end of the parallel connection accesses the external acquisition signal, and the second end of the parallel connection is connected to the filtering circuit; one end of the fourth resistor switch circuit is connected to the connection point of the second end of the parallel connection and the filtering circuit, and the other end is grounded; one end of the fifth resistor switch circuit is connected to the connection point of the second end of the parallel connection and the filtering circuit, and the other end accesses the reference voltage; one end of the first capacitor is connected to the connection point of the second end of the parallel connection and the filtering circuit, and the other end is grounded; the first resistor switch circuit, the second resistor switch circuit, the third resistor switch circuit, the fourth resistor switch circuit, and the fifth resistor switch circuit are all connected to the switching circuit, and perform circuit on / off control according to the switch driving signal to enable the mode conversion circuit to switch the circuit acquisition mode.

[0008] In one embodiment, if the circuit acquisition mode is the first mode, the third resistor switch circuit is turned on; if the circuit acquisition mode is the second mode, the first resistor switch circuit and the fourth resistor switch circuit are turned on; if the circuit acquisition mode is the third mode, the second resistor switch circuit and the fifth resistor switch circuit are turned on; if the circuit acquisition mode is the fourth mode, the second resistor switch circuit and the fourth resistor switch circuit are turned on.

[0009] In one embodiment, the first resistive switching circuit includes: a first resistor and a first switching element connected in series, and a control end of the first switching element is connected to the switching circuit; the first resistor is a thermistor; the second resistive switching circuit includes: a second resistor and a second switching element connected in series, and a control end of the second switching element is connected to the switching circuit; the second resistor is a high-precision resistor; the third resistive switching circuit includes: a third resistor and a third switching element connected in series, and a control end of the third switching element is connected to the switching circuit; the fourth resistive switching circuit includes: a fourth resistor and a fourth switching element connected in series, and a control end of the fourth switching element is connected to the switching circuit; the fourth resistor is a high-precision resistor; the fifth resistive switching circuit includes: a fifth resistor and a fifth switching element connected in series, and a control end of the fifth switching element is connected to the switching circuit; the fifth resistor is a high-precision resistor.

[0010] In one embodiment, the filtering circuit includes: a sixth resistor, a seventh resistor, a second capacitor, and a third capacitor; one end of the sixth resistor is connected to the mode conversion circuit, and the other end of the sixth resistor is connected to the control circuit through the seventh resistor; one end of the second capacitor is connected to a connection point of the sixth resistor and the seventh resistor, and the other end is grounded; one end of the third capacitor is connected to a connection point of the seventh resistor and the control circuit, and the other end is grounded.

[0011] In one embodiment, the multi-type signal acquisition device further includes: a pulse protection circuit; one end of the pulse protection circuit is connected to a connection point of the mode conversion circuit and the filtering circuit, and the other end is grounded.

[0012] In one embodiment, the multi-type signal acquisition device further includes: a clamping circuit; the clamping circuit is connected between the filtering circuit and the control circuit, and is configured to perform voltage clamping on the externally acquired signal after filtering and transmit the externally acquired signal after clamping to the control circuit.

[0013] In one embodiment, the clamping circuit includes a first diode and a second diode; one end of the first diode is connected to an external voltage, and the other end is connected to a connection point of the filtering circuit and the control circuit; one end of the second diode is connected to a connection point of the filtering circuit and the control circuit, and the other end is grounded.

[0014] In one embodiment, the multi-type signal acquisition device further includes: a voltage follower circuit; the voltage follower circuit is connected between the clamping circuit and the control circuit.

[0015] In one embodiment, the control circuit includes: an analog-to-digital conversion circuit and a control chip; the control chip is connected to the switching circuit and is configured to obtain a mode configuration instruction input externally, generate a mode switching signal according to the mode configuration instruction, and transmit the mode switching signal to the switching circuit; the analog-to-digital conversion circuit is connected to the control chip and the multi-type signal access circuit, and is configured to perform analog-to-digital conversion on the externally collected signal to obtain a digital collected signal; the control chip is further configured to determine signal parameters according to the digital collected signal.

[0016] In one embodiment, the multi-type signal acquisition device further includes: an external collected signal gating circuit; the external collected signal gating circuit is connected to the multi-type signal access circuit and the switching circuit; the external collected signal gating circuit accesses a plurality of externally collected signals of different types respectively, and is configured to transmit the externally collected signal whose type matches the circuit acquisition mode of the multi-type signal access circuit to the multi-type signal access circuit according to the switch driving signal.

[0017] In the above multi-type signal acquisition device, the multi-type signal acquisition device includes: a multi-type signal access circuit, a control circuit, and a switching circuit. The control circuit is respectively connected to the switching circuit and the multi-type signal access circuit, and is configured to obtain a mode configuration instruction input externally, generate a mode switching signal according to the mode configuration instruction, and transmit the mode switching signal to the switching circuit. The switching circuit is connected to the multi-type signal access circuit, and is configured to generate a switch driving signal according to the mode switching signal and transmit the switch driving signal to the multi-type signal access circuit. The multi-type signal access circuit is configured to switch the circuit acquisition mode according to the switch driving signal; access an externally collected signal and transmit the externally collected signal to the control circuit. Among them, the multi-type signal access circuit includes a plurality of circuit acquisition modes, and the plurality of circuit acquisition modes correspond to different signal types of the externally collected signal. The control circuit is further configured to determine signal parameters according to the externally collected signal. By receiving the mode configuration instruction and adjusting the circuit acquisition mode through the mode configuration instruction. Since different circuit acquisition modes can correspond to externally collected signals of different signal types, the acquisition of multiple signal types is realized through the multi-type signal acquisition device, and the flexibility of data acquisition is improved. And for different signal types, the same multi-type signal acquisition device is used, further reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural block diagram of a multi-type signal acquisition device in one embodiment;

[0019] Figure 2 is a structural block diagram of a multi-type signal acquisition device in another embodiment;

[0020] Figure 3 The structural block diagram of a multi-type signal acquisition device in another embodiment;

[0021] Figure 4 The structural block diagram of a multi-type signal acquisition device in a detailed embodiment;

[0022] Figure 5 The schematic flow diagram of a signal acquisition method in an embodiment. Specific embodiments

[0023] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. 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.

[0024] In the current related technologies, different signal acquisition circuits are required for data acquisition of voltage, current, and temperature respectively, which is not flexible to use; and signal acquisition circuits need to be designed separately for voltage, current, and temperature, resulting in high cost and large volume.

[0025] Based on the above, the embodiments of the present application provide a multi-type signal acquisition device, which can realize the acquisition of different input signals on the premise of the same circuit design. As Figure 1 shown, the multi-type signal acquisition device includes: a multi-type signal access circuit 100, a control circuit 200, and a switching circuit 300.

[0026] The control circuit 200 is respectively connected to the switching circuit 300 and the multi-type signal access circuit 100, and is used to obtain a mode configuration instruction input from the outside, generate a mode switching signal according to the mode configuration instruction, and transmit the mode switching signal to the switching circuit 300.

[0027] The control circuit 200 can receive externally input mode configuration instructions, which can be received wirelessly or wiredly, and this embodiment does not make specific limitations. The mode configuration instructions can be input from a computer device to the control circuit 200. For example, the user inputs instructions through the interaction interface of the computer device, and the computer device then transmits the mode configuration instructions to the control circuit 200. The mode configuration instructions can also be input to the control circuit 200 through a dedicated mode input hardware device. For example, the dedicated mode input hardware can be multiple switches, and specific codes are formed through the on / off states of the multiple switches, and different codes correspond to different mode configuration instructions. There are multiple types of mode configuration instructions, which respectively correspond to different circuit acquisition modes. The mode configuration instructions include: voltage mode configuration instructions, current mode configuration instructions, temperature mode configuration instructions, etc. Among them, the voltage mode configuration instructions can control the multi-type signal access circuit 100 to switch to the voltage acquisition mode; the current mode configuration instructions can control the multi-type signal access circuit 100 to switch to the current acquisition mode; the temperature mode configuration instructions can control the multi-type signal access circuit 100 to switch to the temperature acquisition mode. After receiving the mode configuration instructions, the control circuit 200 generates a mode switching signal for the switching circuit 300 to recognize, and transmits the mode switching signal to the switching circuit 300. It can be understood that when the received is a voltage mode configuration instruction, a voltage mode switching signal is generated; when the received is a current mode configuration instruction, a current mode switching signal is generated; when the received is a temperature mode configuration instruction, a temperature mode switching signal is generated.

[0028] The switching circuit 300 is connected to the multi-type signal access circuit 100, and is used to generate a switch driving signal according to the mode switching signal and transmit the switch driving signal to the multi-type signal access circuit 100.

[0029] After receiving the mode switching signal, the switching circuit 300 generates a switch driving signal for controlling the circuit acquisition mode of the multi-type signal access circuit 100. For example, when the received is a voltage mode switching signal, a first switch driving signal for voltage acquisition is generated; when the received is a current mode switching signal, a second switch driving signal for current acquisition is generated; when the received is a temperature mode switching signal, a third switch driving signal for temperature acquisition is generated.

[0030] The multi-type signal access circuit 100 is used to switch the circuit acquisition mode according to the switch driving signal; access external acquisition signals and transmit the external acquisition signals to the control circuit 200.

[0031] The multi-type signal access circuit 100 includes multiple circuit acquisition modes, and different circuit acquisition modes correspond to different types of external acquisition signals. The types of external acquisition signals include voltage acquisition signals, current acquisition signals, and temperature acquisition signals. After receiving the switch drive signal, the multi-type signal access circuit 100 first switches its own circuit acquisition mode according to the switch drive signal. When receiving the first switch drive signal for voltage acquisition, it controls the multi-type signal access circuit 100 to switch to the voltage acquisition mode; when receiving the second switch drive signal for current acquisition, it controls the multi-type signal access circuit 100 to switch to the current acquisition mode; when receiving the third switch drive signal for temperature acquisition, it controls the multi-type signal access circuit 100 to switch to the temperature acquisition mode. Different switch drive signals are used to control the on / off of different switches in the multi-type signal access circuit 100, thereby realizing the switching of the circuit acquisition mode. After completing the switching of the circuit acquisition mode, if the current multi-type signal access circuit 100 is in the voltage acquisition mode, at this time, the multi-type signal access circuit 100 accesses the voltage acquisition interface, and the external acquisition signal for acquisition is the voltage acquisition signal; if the current multi-type signal access circuit 100 is in the current acquisition mode, at this time, the multi-type signal access circuit 100 accesses the current acquisition interface, and the external acquisition signal for acquisition is the current acquisition signal; if the current multi-type signal access circuit 100 is in the temperature acquisition mode, at this time, the multi-type signal access circuit 100 accesses the temperature acquisition interface, and the external acquisition signal for acquisition is the temperature acquisition signal.

[0032] The control circuit 200 is further configured to determine signal parameters according to the external acquisition signal.

[0033] After receiving the external acquisition signal, the control circuit 200 obtains the corresponding signal parameters according to the external acquisition signal. For example, when the received external acquisition signal is a voltage acquisition signal, the voltage value is calculated; when the received external acquisition signal is a current acquisition signal, the current value is calculated; when the received external acquisition signal is a temperature acquisition signal, the temperature value is calculated.

[0034] In this embodiment, by receiving the mode configuration instruction and adjusting the circuit acquisition mode through the mode configuration instruction. Since different circuit acquisition modes can correspond to external acquisition signals of different signal types. Thus, the multi-type signal acquisition device can realize the acquisition of multiple signal types, improving the flexibility of data acquisition. And for different signal types, using the same multi-type signal acquisition device further reduces the cost.

[0035] In one of the embodiments, such as Figure 2As shown in the figure, the multi-type signal access circuit 100 includes: a mode conversion circuit 110 and a filtering circuit 120; the mode conversion circuit 110 is connected to the filtering circuit 120 and the switching circuit 300, and is used to switch the circuit acquisition mode according to the switch drive signal; access the external acquisition signal and transmit the external acquisition signal to the filtering circuit 120; the filtering circuit 120 is connected to the control circuit 200, and is used to filter the external acquisition signal and transmit the filtered external acquisition signal to the control circuit 200.

[0036] The mode conversion circuit 110 receives the switch drive signal transmitted by the switching circuit 300, and switches the circuit acquisition mode through the switch drive signal. Then, the external acquisition signal is accessed and transmitted to the filtering circuit 120. The filtering circuit 120 filters the external acquisition signal and then transmits the filtered external acquisition signal to the control circuit 200. Among them, the mode conversion circuit 110 includes a plurality of switch elements, and different circuit acquisition modes are switched by controlling the on and off of the plurality of switch elements. The filtering circuit 120 can remove the noise or interference in the external acquisition signal, make the signal smoother and purer, improve the signal quality, and reduce the influence of noise on subsequent processing. The filtering circuit 120 may include a low-pass filter, a high-pass filter, a band-pass filter, etc., and the embodiments of the present application do not make specific limitations.

[0037] Specifically, as Figure 3 shown in the figure, the mode conversion circuit 110 includes: a first resistor switch circuit 111, a second resistor switch circuit 112, a third resistor switch circuit 113, a fourth resistor switch circuit 114, a fifth resistor switch circuit 115, and a first capacitor C1; the first resistor switch circuit 111, the second resistor switch circuit 112, and the third resistor switch circuit 113 are connected in parallel, the first end of the parallel connection accesses the external acquisition signal, and the second end of the parallel connection is connected to the filtering circuit 120; one end of the fourth resistor switch circuit 114 is connected to the connection point of the second end of the parallel connection and the filtering circuit 120, and the other end is grounded; one end of the fifth resistor switch circuit 115 is connected to the connection point of the second end of the parallel connection and the filtering circuit 120, and the other end accesses the reference voltage; one end of the first capacitor C1 is connected to the connection point of the second end of the parallel connection and the filtering circuit 120, and the other end is grounded; the first resistor switch circuit 111, the second resistor switch circuit 112, the third resistor switch circuit 113, the fourth resistor switch circuit 114, and the fifth resistor switch circuit 115 are all connected to the switching circuit 300, and the circuit on and off is controlled according to the switch drive signal, so that the mode conversion circuit 110 switches the circuit acquisition mode.

[0038] The first resistive switching circuit 111, the second resistive switching circuit 112, the third resistive switching circuit 113, the fourth resistive switching circuit 114, and the fifth resistive switching circuit 115 are all composed of a resistor and a switch. Whether the corresponding resistor is connected to the circuit is controlled by the on / off state of the switch. When the switch is in the on state, the corresponding resistor is connected to the circuit; when the switch is in the off state, the corresponding resistor is disconnected from the circuit. The first resistive switching circuit 111, the second resistive switching circuit 112, the third resistive switching circuit 113, the fourth resistive switching circuit 114, and the fifth resistive switching circuit 115 are all connected to the switching circuit 300 to control the on / off of the switch according to the switch driving signal, so as to switch the circuit acquisition mode.

[0039] The switch driving signal includes 5 driving signals corresponding to the first resistive switching circuit 111, the second resistive switching circuit 112, the third resistive switching circuit 113, the fourth resistive switching circuit 114, and the fifth resistive switching circuit 115. The first resistive switching circuit 111 corresponds to the first driving signal, the second resistive switching circuit 112 corresponds to the second driving signal, the third resistive switching circuit 113 corresponds to the third driving signal, the fourth resistive switching circuit 114 corresponds to the fourth driving signal, and the fifth resistive switching circuit 115 corresponds to the fifth driving signal.

[0040] If the switch driving signal is the first switch driving signal for voltage acquisition, through the first switch driving signal, the circuit acquisition mode is switched to the voltage acquisition mode. If the circuit acquisition mode is the first mode, that is, the voltage acquisition mode, the third resistive switching circuit 113 is turned on. At this time, the first driving signal controls the switch corresponding to the first resistive switching circuit 111 to be turned off; the second driving signal controls the switch corresponding to the second resistive switching circuit 112 to be turned off; the third driving signal controls the switch corresponding to the third resistive switching circuit 113 to be turned on; the fourth driving signal controls the switch corresponding to the fourth resistive switching circuit 114 to be turned off; the fifth driving signal controls the switch corresponding to the fifth resistive switching circuit 115 to be turned off.

[0041] If the switch driving signal is the second switch driving signal for current acquisition, through the second switch driving signal, the circuit acquisition mode is switched to the current acquisition mode. If the circuit acquisition mode is the second mode, that is, the current acquisition mode, the first resistive switching circuit 111 and the fourth resistive switching circuit 114 are turned on. At this time, the first driving signal controls the switch corresponding to the first resistive switching circuit 111 to be turned on; the second driving signal controls the switch corresponding to the second resistive switching circuit 112 to be turned off; the third driving signal controls the switch corresponding to the third resistive switching circuit 113 to be turned off; the fourth driving signal controls the switch corresponding to the fourth resistive switching circuit 114 to be turned on; the fifth driving signal controls the switch corresponding to the fifth resistive switching circuit 115 to be turned off.

[0042] If the switch driving signal is the third switch driving signal for temperature acquisition, the switching circuit acquisition mode is switched to the temperature acquisition mode through the third switch driving signal. If the circuit acquisition mode is the third mode, that is, the temperature acquisition mode, the second resistor switch circuit 112 and the fifth resistor switch circuit 115 are turned on. At this time, the first driving signal controls the switch corresponding to the first resistor switch circuit 111 to turn off; the second driving signal controls the switch corresponding to the second resistor switch circuit 112 to turn on; the third driving signal controls the switch corresponding to the third resistor switch circuit 113 to turn off; the fourth driving signal controls the switch corresponding to the fourth resistor switch circuit 114 to turn off; the fifth driving signal controls the switch corresponding to the fifth resistor switch circuit 115 to turn on.

[0043] If the switch driving signal is the fourth switch driving signal for voltage division acquisition, the switching circuit acquisition mode is switched to the voltage division acquisition mode through the fourth switch driving signal. If the circuit acquisition mode is the fourth mode, that is, the voltage division acquisition mode, the second resistor switch circuit 112 and the fourth resistor switch circuit 114 are turned on. At this time, the first driving signal controls the switch corresponding to the first resistor switch circuit 111 to turn off; the second driving signal controls the switch corresponding to the second resistor switch circuit 112 to turn on; the third driving signal controls the switch corresponding to the third resistor switch circuit 113 to turn off; the fourth driving signal controls the switch corresponding to the fourth resistor switch circuit 114 to turn on; the fifth driving signal controls the switch corresponding to the fifth resistor switch circuit 115 to turn off. It can be understood that multiple resistors for individual voltage division can also be added before the filter circuit, and their connection method to the circuit is the same as that of the fourth resistor switch circuit 114 to the circuit.

[0044] In one embodiment, as Figure 4 shown, the first resistor switch circuit 111 includes: a first resistor R1 and a first switch element K1 connected in series, and the control end of the first switch element K1 is connected to the switching circuit 300; the first resistor R1 is a thermistor. The first switch element K1 can be a relay or a switching tube, and its control end is connected to the switching circuit 300 for controlling its own on-off according to the first driving signal. The first resistor R1 is a thermistor. By way of example, it can be a positive temperature coefficient thermistor. When the circuit acquisition mode is the current acquisition mode, the first switch element K1 is turned on, and the first resistor R1 is connected to the circuit. At this time, when current sampling is performed, through the thermistor, the circuit can be protected when the input current is too large.

[0045] In one embodiment, as Figure 4As shown, the second resistor switching circuit 112 includes: a second resistor R2 and a second switching element K2 connected in series. The control terminal of the second switching element K2 is connected to the switching circuit 300; the second resistor R2 is a high-precision resistor. The second switching element K2 can be a relay or a switching transistor, and its control terminal is connected to the switching circuit 300 for controlling its own on / off according to the second driving signal. The second resistor R2 is a high-precision resistor, and a high-precision resistor is a resistor with a small tolerance of the resistance value and a stable resistance value. When the circuit acquisition mode is the temperature acquisition mode or the voltage division acquisition mode, the second switching element K2 is turned on, and the second resistor R2 is connected to the circuit.

[0046] In one embodiment, as Figure 4 shown, the third resistor switching circuit 113 includes: a third resistor R3 and a third switching element K3 connected in series. The control terminal of the third switching element K3 is connected to the switching circuit 300. The third switching element K3 can be a relay or a switching transistor, and its control terminal is connected to the switching circuit 300 for controlling its own on / off according to the third driving signal. When the circuit acquisition mode is the voltage acquisition mode, the third switching element K3 is turned on, and the third resistor R3 is connected to the circuit.

[0047] In one embodiment, as Figure 4 shown, the fourth resistor switching circuit 114 includes: a fourth resistor R4 and a fourth switching element K4 connected in series. The control terminal of the fourth switching element K4 is connected to the switching circuit 300; the fourth resistor R4 is a high-precision resistor. The fourth switching element K4 can be a relay or a switching transistor, and its control terminal is connected to the switching circuit 300 for controlling its own on / off according to the fourth driving signal. The fourth resistor R4 is a high-precision resistor, and a high-precision resistor is a resistor with a small tolerance of the resistance value and a stable resistance value. When the circuit acquisition mode is the current acquisition mode or the voltage division acquisition mode, the fourth switching element K4 is turned on, and the fourth resistor R4 is connected to the circuit.

[0048] In one embodiment, as Figure 4 shown, the fifth resistor switching circuit 115 includes: a fifth resistor R5 and a fifth switching element K5 connected in series. The control terminal of the fifth switching element K5 is connected to the switching circuit 300; the fifth resistor R5 is a high-precision resistor. The fifth switching element K5 can be a relay or a switching transistor, and its control terminal is connected to the switching circuit 300 for controlling its own on / off according to the fifth driving signal. The fifth resistor R5 is a high-precision resistor, and a high-precision resistor is a resistor with a small tolerance of the resistance value and a stable resistance value. When the circuit acquisition mode is the temperature acquisition mode, the fifth switching element K5 is turned on, and the fifth resistor R5 is connected to the circuit.

[0049] In this embodiment, through different combinations of resistors and switches, the switch can switch different circuit acquisition modes under different on / off conditions, thereby improving the flexibility and adaptability of multi-type signal acquisition devices.

[0050] In one embodiment, as Figure 4 shown, the filter circuit 120 includes: a sixth resistor R6, a seventh resistor R7, a second capacitor C2, and a third capacitor C3; one end of the sixth resistor R6 is connected to the mode conversion circuit 110, and the other end of the sixth resistor R6 is connected to the control circuit 200 through the seventh resistor R7; one end of the second capacitor C2 is connected to the connection point of the sixth resistor R6 and the seventh resistor R7, and the other end is grounded; one end of the third capacitor C3 is connected to the connection point of the seventh resistor R7 and the control circuit 200, and the other end is grounded.

[0051] The sixth resistor R6 and the second capacitor C2 form an RC filter circuit, and the seventh resistor R7 and the third capacitor C3 form an RC filter circuit. The filter circuit removes noise or interference in the externally collected signal to improve the signal quality.

[0052] In one embodiment, as Figure 4 shown, the multi-type signal acquisition device further includes: a pulse protection circuit 400; one end of the pulse protection circuit 400 is connected to the connection point of the mode conversion circuit 110 and the filter circuit 120, and the other end is grounded. Among them, the pulse protection circuit 400 can be a TVS diode, that is, a transient voltage suppression diode. The transient voltage suppression diode is an overvoltage protection device with bidirectional voltage regulation characteristics and bidirectional negative resistance characteristics, used to suppress instantaneous overvoltage. When a surge pulse voltage appears instantaneously in the protected circuit, the bidirectional breakdown diode can quickly break down in a Zener manner, changing from a high-resistance state to a low-resistance state, shunting and clamping the surge voltage, thereby protecting each component in the circuit from being damaged by the instantaneous surge pulse voltage.

[0053] In one embodiment, as Figure 4 shown, the multi-type signal acquisition device further includes: a clamping circuit 500; the clamping circuit 500 is connected between the filter circuit 120 and the control circuit 200, and is used to clamp the voltage of the externally collected signal after filtering and transmit the clamped externally collected signal to the control circuit 200.

[0054] To avoid damage to the subsequent circuit caused by excessive voltage, by setting the clamping circuit, the voltage of the externally collected signal is clamped within a preset range, thereby protecting the subsequent circuit from damage.

[0055] The clamping circuit 500 includes a first diode D2 and a second diode D3; one end of the first diode D2 is connected to an external voltage, and the other end is connected to the connection point between the filtering circuit 120 and the control circuit 200; one end of the second diode D3 is connected to the connection point between the filtering circuit 120 and the control circuit 200, and the other end is grounded. The clamping circuit 500 is formed by the first diode D2 and the second diode D3, and the voltage range corresponding to the clamping circuit 500 is from the external voltage to zero voltage. By clamping the voltage of the externally collected signal, subsequent circuits are protected. Among them, the external voltage can be the power supply voltage of the AD conversion chip in the control circuit.

[0056] In one embodiment, as Figure 4 shown, the multi-type signal acquisition device further includes: a voltage follower circuit 600; the voltage follower circuit 600 is connected between the clamping circuit 500 and the control circuit 200. Exemplarily, the voltage follower circuit 600 can be a voltage follower circuit composed of an amplifier. The positive input terminal of the amplifier is connected to the clamping circuit 500, the output terminal of the amplifier is connected to the control circuit 200, and the negative input terminal of the amplifier is connected to the output terminal of the amplifier. The voltage follower circuit 600 is used to prevent the externally collected signal from being distorted.

[0057] In one embodiment, the multi-type signal acquisition device further includes: an input capacitor C4; one end of the input capacitor C4 is connected to one end of the multi-type signal access circuit 100 for accessing an externally collected signal, and the other end is grounded.

[0058] In one embodiment, the control circuit 200 includes: an analog-to-digital conversion circuit 210 and a control chip 220; the control chip 220 is connected to the switching circuit 300, and is used to obtain a mode configuration instruction input externally, and generate a mode switching signal according to the mode configuration instruction, and transmit the mode switching signal to the switching circuit 300; the analog-to-digital conversion circuit 210 is connected to the control chip 220 and the multi-type signal access circuit 100, and is used to perform analog-to-digital conversion on the externally collected signal to obtain a digital acquisition signal; the control chip 220 is further used to determine signal parameters according to the digital acquisition signal. Among them, the analog-to-digital conversion circuit 210 can be an AD conversion chip, and the control chip 220 can be an MCU. The MCU obtains the mode configuration instruction, and thus controls the multi-type signal access circuit 100 to switch the circuit acquisition mode through the switching circuit 300. When collecting the externally collected signal, the AD conversion chip converts the externally collected analog signal into a digital acquisition signal, and the MCU determines the signal parameters through the digital acquisition signal.

[0059] In one embodiment, as Figure 4As shown, the multi-type signal acquisition device further includes: an external acquisition signal gating circuit 700; the external acquisition signal gating circuit 700 is connected to the multi-type signal access circuit 100 and the switching circuit 300; the external acquisition signal gating circuit 700 accesses multiple external acquisition signals of different types respectively, and is used to transmit the external acquisition signal whose type matches the circuit acquisition mode of the multi-type signal access circuit 100 to the multi-type signal access circuit 100 according to the switch drive signal. More specifically, the external acquisition signal gating circuit 700 includes a sixth switch element K6, a seventh switch element K7, and an eighth switch element K8. One end of the sixth switch element K6 accesses the external acquisition signal of voltage type, and the other end is connected to the multi-type signal access circuit 100; one end of the seventh switch element K7 accesses the external acquisition signal of current type, and the other end is connected to the multi-type signal access circuit 100; one end of the eighth switch element K8 accesses the external acquisition signal of temperature type, and the other end is connected to the multi-type signal access circuit 100. The control ends of the sixth switch element K6, the seventh switch element K7, and the eighth switch element K8 are all connected to the switching circuit 300, and are used to control the on / off of the switch element according to the switch drive signal.

[0060] When the switch drive signal is the first switch drive signal, at this time, the circuit acquisition mode is the first mode, that is, the voltage acquisition mode, then the first switch drive signal is also used to control the sixth switch element K6 to conduct, the seventh switch element K7 to turn off, and the eighth switch element K8 to turn off.

[0061] When the switch drive signal is the second switch drive signal, at this time, the circuit acquisition mode is the second mode, that is, the current acquisition mode, then the second switch drive signal is also used to control the sixth switch element K6 to turn off, the seventh switch element K7 to conduct, and the eighth switch element K8 to turn off.

[0062] When the switch drive signal is the third switch drive signal, at this time, the circuit acquisition mode is the third mode, that is, the temperature acquisition mode, then the third switch drive signal is also used to control the sixth switch element K6 to turn off, the seventh switch element K7 to turn off, and the eighth switch element K8 to conduct.

[0063] When the switch drive signal is the fourth switch drive signal, at this time, the circuit acquisition mode is the fourth mode, that is, the voltage division acquisition mode, then the fourth switch drive signal is also used to control the sixth switch element K6 to conduct, the seventh switch element K7 to turn off, and the eighth switch element K8 to turn off.

[0064] In one detailed embodiment, such as Figure 4As shown, the input port inputs external acquisition signals, which can be voltage acquisition signals, current acquisition signals, and temperature acquisition signals. Among them, C4 is the input capacitor; R1 / R2 / R3 and C1, R6 and C2, R7 and C3 form a low-pass filter circuit; D1 is a transient voltage pulse protection circuit; D2 and D3 clamp the input voltage of the AD conversion chip to the VDD power supply voltage and 0V voltage to avoid damage to the AD chip caused by out-of-range input; the MCU and the AD chip perform data transmission through communication or digital means. A voltage follower circuit can be added to the input port of the AD chip as needed to improve the adaptability of the circuit to different inputs.

[0065] The MCU has built-in processing programs for multiple input methods and is provided with flag bits to facilitate the discrimination of the current circuit state. Among them, the flag bits include the flag bit for the setting method, the high-order flag bit of the state, the low-order flag bit of the state, and the flag bit for the setting state. The setting method indicates the method of setting the flag bit. The high-order state and the low-order state together represent the circuit acquisition mode. The setting state indicates whether the flag bit has been set. Specifically, the flag bit for the setting method is represented by 0 and 1. When the flag bit for the setting method is 1, it means setting through hardware, that is, inputting to the control circuit through a dedicated mode input hardware device. For example, the dedicated mode input hardware device includes: a setting method switch, a high-order state switch, and a low-order state switch. By reading the switch states of the dedicated mode input hardware device, the flag bit is set. The switch being closed is 1, and the switch being open is 0; when the flag bit for the setting method is 0, it means directly writing the flag bit through the human-machine interface or the programming. When the flag bit for the setting state is 1, it means that the flag bit has been set through software or hardware; when the flag bit for the setting state is 0, it means that the flag bit has not been set through software or hardware. The high-order flag bit and the low-order flag bit of the state are 00 in sequence, indicating that the mode setting has not been completed; the high-order flag bit and the low-order flag bit of the state are 01 in sequence, indicating the voltage acquisition mode; the high-order flag bit and the low-order flag bit of the state are 10 in sequence, indicating the current acquisition mode; the high-order flag bit and the low-order flag bit of the state are 11 in sequence, indicating the resistance acquisition mode, that is, the temperature acquisition mode.

[0066] During the actual usage process, first, the multi-type signal acquisition device is powered on. The MCU obtains the setting flag bit method and initializes the setting method flag bit. If the setting method flag bit is 0, all flag bits are directly written through the human-machine interface or the programming software. If the setting method flag bit is 1, all flag bits are set through hardware. The flag bits of the high state and the low state of the status are obtained, the corresponding circuit acquisition mode is matched, and the corresponding states of switches K1, K2, K3, K4, and K5 in this mode are set. In the voltage acquisition mode, switch K3 is closed, and K1, K2, K4, and K5 are opened. In the temperature acquisition mode, switches K2 and K5 are closed, and K1, K3, and K4 are opened. In the current sampling mode, switches K1 and K4 are closed, and switches K2, K3, and K5 are opened. The external acquisition signal is accessed, AD conversion is performed, and the AD value is processed and the final result is output.

[0067] In the voltage acquisition mode, R1, R2, R4, and R5 are not connected to the circuit, and R3 is connected to the circuit as a common resistor. The voltage input enters the AD chip after protection and filtering, and the analog-to-digital signal conversion is realized through the built-in AD conversion circuit of the chip. The digital quantity X is read by the MCU. The MCU calculates according to the inherent formula of the AD chip to identify the input voltage V. Specifically: V = X * a, where a is the calculation coefficient of the AD chip.

[0068] In the voltage acquisition mode, R3 and R4 can be connected to the circuit at the same time, and R1, R2, and R5 are not connected to the circuit. The voltage input enters the AD chip after protection and filtering, and the analog-to-digital signal conversion is realized through the built-in AD conversion circuit of the chip. The digital quantity X is read by the MCU. The MCU calculates according to the inherent formula of the AD chip to identify the input voltage V. Specifically: V / (R4 + R1) = (X * a) / R4, where a is the calculation coefficient of the AD chip.

[0069] In the temperature acquisition mode, R2 and R5 are connected to the circuit, and R1, R3, and R4 are not connected to the circuit. Among them, R2 and R5 are high-precision resistors. The external uses a thermistor to detect the temperature. By calculating the resistance value of the external thermistor, the temperature value is determined. Among them, the external thermistor is RX. RX and R2 / R5 form a voltage division circuit for the reference voltage Vref. The voltage after voltage division is converted from analog signal to digital signal through the built-in AD conversion circuit of the chip. The digital quantity X is read by the MCU. The MCU first calculates according to the inherent formula of the AD chip to identify the input voltage V. Specifically: V = X * a, where a is the calculation coefficient of the AD chip. Then the resistance value of RX is calculated. Specifically: RX = R5 * V / (Vref - V) - R2. The temperature is determined through the resistance value of RX.

[0070] In the current acquisition mode, R4 and R1 are connected to the circuit, while R2, R3, and R5 are not. Among them, R4 is a high-precision resistor, and R1 is a positive temperature coefficient thermistor. Through the positive temperature coefficient thermistor, the circuit can be protected when the input current is too large. R1 and R4 form a current loop, and the voltage V on R4 is V = I * R4. The conversion from analog signal to digital signal is realized through the built-in AD conversion circuit of the chip, and the digital quantity X is read by the MCU. The MCU calculates according to the inherent formula of the AD chip to identify the input voltage V, specifically: V = X * a, where a is the calculation coefficient of the AD chip. Then the current value is calculated, specifically: I = V / R4.

[0071] Based on the same inventive concept, the embodiment of the present application also provides a signal acquisition method applied to the above multi-type signal acquisition device. The implementation solution provided by this method to solve the problem is similar to the implementation solution recorded in the above device. Therefore, the specific limitations in one or more signal acquisition method embodiments provided below can refer to the limitations on the multi-type signal acquisition device in the above text, and will not be repeated here.

[0072] In one embodiment, as Figure 5 shown, a signal acquisition method is provided, which is applied to any one of the above multi-type signal acquisition devices. The method includes:

[0073] Step 501, obtain a mode configuration instruction input externally.

[0074] Step 502, according to the mode configuration instruction, switch the circuit acquisition mode; the multi-type signal acquisition device includes multiple circuit acquisition modes, and the multiple circuit acquisition modes correspond to different signal types of external acquisition signals.

[0075] Step 503, obtain an external acquisition signal, and determine signal parameters according to the external acquisition signal.

[0076] In this embodiment, by receiving the mode configuration instruction and adjusting the circuit acquisition mode through the mode configuration instruction. Since different circuit acquisition modes can correspond to external acquisition signals of different signal types. Thus, the acquisition of multiple signal types is realized through the multi-type signal acquisition device, improving the flexibility of data acquisition. And for different signal types, using the same multi-type signal acquisition device further reduces the cost.

[0077] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not conflict, it should be considered as the scope recorded in this specification.

[0078] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A multi-type signal acquisition device, characterized in that, The multi-type signal acquisition device includes: a multi-type signal access circuit, a control circuit, and a switching circuit; The control circuit is respectively connected to the switching circuit and the multi-type signal access circuit, and is configured to obtain a mode configuration instruction input externally, generate a mode switching signal according to the mode configuration instruction, and transmit the mode switching signal to the switching circuit; The switching circuit is connected to the multi-type signal access circuit, and is configured to generate a switch drive signal according to the mode switching signal, and transmit the switch drive signal to the multi-type signal access circuit; The multi-type signal access circuit is configured to switch the circuit acquisition mode according to the switch drive signal; access an external acquisition signal, and transmit the external acquisition signal to the control circuit; the multi-type signal access circuit includes a plurality of the circuit acquisition modes, and the plurality of the circuit acquisition modes correspond to different types represented by the external acquisition signals; The control circuit is further configured to determine signal parameters according to the external acquisition signal.

2. The multi-type signal acquisition device according to claim 1, characterized in that The multi-type signal access circuit includes: a mode conversion circuit and a filtering circuit; The mode conversion circuit is connected to the filtering circuit and the switching circuit, and is configured to switch the circuit acquisition mode according to the switch drive signal; access an external acquisition signal, and transmit the external acquisition signal to the filtering circuit; The filtering circuit is connected to the control circuit, and is configured to filter the external acquisition signal, and transmit the filtered external acquisition signal to the control circuit.

3. The multi-type signal acquisition device according to claim 2, characterized in that, The mode conversion circuit includes: a first resistor switch circuit, a second resistor switch circuit, a third resistor switch circuit, a fourth resistor switch circuit, a fifth resistor switch circuit, and a first capacitor; The first resistor switch circuit, the second resistor switch circuit, and the third resistor switch circuit are connected in parallel, the first end of the parallel connection is connected to the external acquisition signal, and the second end of the parallel connection is connected to the filtering circuit; One end of the fourth resistor switch circuit is connected to the connection point of the second end of the parallel connection and the filtering circuit, and the other end is grounded; One end of the fifth resistor switch circuit is connected to the connection point of the second end of the parallel connection and the filtering circuit, and the other end is connected to a reference voltage; One end of the first capacitor is connected to the connection point of the second end of the parallel connection and the filtering circuit, and the other end is grounded; The first resistor switch circuit, the second resistor switch circuit, the third resistor switch circuit, the fourth resistor switch circuit, and the fifth resistor switch circuit are all connected to the switching circuit, and perform circuit on-off control according to the switch drive signal, so that the mode conversion circuit switches the circuit acquisition mode.

4. The multi-type signal acquisition device according to claim 3, wherein if the circuit acquisition mode is the first mode, the third resistor switch circuit is turned on; if the circuit acquisition mode is the second mode, the first resistor switch circuit and the fourth resistor switch circuit are turned on; if the circuit acquisition mode is the third mode, the second resistor switch circuit and the fifth resistor switch circuit are turned on; If the circuit acquisition mode is the fourth mode, the second resistor-switching circuit and the fourth resistor-switching circuit are turned on.

5. The multi-type signal acquisition device according to claim 3, wherein the first resistor-switching circuit includes: a first resistor and a first switching element connected in series, and a control end of the first switching element is connected to the switching circuit; the first resistor is a thermistor; the second resistor-switching circuit includes: a second resistor and a second switching element connected in series, and a control end of the second switching element is connected to the switching circuit; the second resistor is a high-precision resistor; the third resistor-switching circuit includes: a third resistor and a third switching element connected in series, and a control end of the third switching element is connected to the switching circuit; the fourth resistor-switching circuit includes: a fourth resistor and a fourth switching element connected in series, and a control end of the fourth switching element is connected to the switching circuit; the fourth resistor is a high-precision resistor; the fifth resistor-switching circuit includes: a fifth resistor and a fifth switching element connected in series, and a control end of the fifth switching element is connected to the switching circuit; the fifth resistor is a high-precision resistor.

6. The multi-type signal acquisition device according to claim 2, wherein, The filter circuit includes: a sixth resistor, a seventh resistor, a second capacitor, and a third capacitor; one end of the sixth resistor is connected to the mode conversion circuit, and the other end of the sixth resistor is connected to the control circuit through the seventh resistor; one end of the second capacitor is connected to the connection point of the sixth resistor and the seventh resistor, and the other end is grounded; one end of the third capacitor is connected to the connection point of the seventh resistor and the control circuit, and the other end is grounded.

7. The multi-type signal acquisition device according to claim 2, wherein, The multi-type signal acquisition device further includes: a pulse protection circuit; one end of the pulse protection circuit is connected to the connection point of the mode conversion circuit and the filter circuit, and the other end is grounded.

8. The multi-type signal acquisition device according to claim 2, wherein, The multi-type signal acquisition device further includes: a clamping circuit; the clamping circuit is connected between the filter circuit and the control circuit, and is configured to perform voltage clamping on the externally acquired signal after filtering, and transmit the externally acquired signal after clamping to the control circuit.

9. The multi-type signal acquisition device according to claim 8, wherein, The clamping circuit includes a first diode and a second diode; one end of the first diode accesses an external voltage, and the other end is connected to the connection point of the filter circuit and the control circuit; one end of the second diode is connected to the connection point of the filter circuit and the control circuit, and the other end is grounded.

10. The multi-type signal acquisition device according to claim 8, characterized in that, The multi-type signal acquisition device further includes: a voltage follower circuit; the voltage follower circuit is connected between the clamping circuit and the control circuit.

11. The multi-type signal acquisition device according to claim 1, wherein, The control circuit includes: an analog-to-digital conversion circuit and a control chip; the control chip is connected to the switching circuit, and is configured to obtain a mode configuration instruction input externally, generate a mode switching signal according to the mode configuration instruction, and transmit the mode switching signal to the switching circuit; the analog-to-digital conversion circuit is connected to the control chip and the multi-type signal access circuit, and is configured to perform analog-to-digital conversion on the externally acquired signal to obtain a digital acquisition signal; The control chip is further configured to determine signal parameters according to the digital acquisition signal.

12. The multi-type signal acquisition device according to claim 1, wherein The multi-type signal acquisition device further includes: an external acquisition signal gating circuit; The external acquisition signal gating circuit is connected to the multi-type signal access circuit and the switching circuit; the external acquisition signal gating circuit is respectively connected to a plurality of external acquisition signals of different types, and is configured to transmit the external acquisition signal of the type matching the circuit acquisition mode of the multi-type signal access circuit to the multi-type signal access circuit according to the switch drive signal.

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