Isolate sampling circuits, domain controllers, and vehicles

Abstract

The utility model proposes an isolated sampling circuit, a domain controller and a vehicle, wherein the domain controller includes a main control circuit, and the isolated sampling circuit includes a unidirectional conduction circuit and a switch circuit. The unidirectional conduction circuit is used to conduct the path between the load end and the power supply end when receiving a conduction signal via the second end, or to shut off the path between the load end and the power supply end when receiving a shutoff signal via the second end; the switch circuit is used to conduct the path between the power supply end and the main control circuit when the unidirectional conduction circuit is in a conduction state, and output a first sampling signal to the main control circuit, or to shut off the path between the power supply end and the main control circuit when the unidirectional conduction circuit is in a shutoff state, and output a second sampling signal to the main control circuit. The utility model adopts discrete devices to replace specific isolation ICs or isolation optocouplers to realize the isolated sampling function of the signal, thereby reducing the design cost of the signal sampling circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of isolated sampling circuits, and in particular to an isolated sampling circuit, a domain controller and a vehicle. Background Art

[0002] The design process of the domain controller uses the acquisition of multiple digital signal inputs, most of which are inputs from external sensors and switch signals, such as windows, seats, electric tail and other Hall sensors, door status and other signals. The existing PI and DI sampling modules of the microcontroller are generally used in conjunction with the external sampling circuit to collect the frequency, pulse width or level of the signal. In the current domain control products, the digital signal acquisition circuit mainly uses the RC filter circuit, and the internal port of the MCU needs to have a voltage clamping function to prevent external high voltage from damaging the internal sampling module of the MCU. However, when designing the digital signal acquisition circuit, not only the external electrostatic protection needs to be considered, but also the MCU needs to have a port protection function, which increases the cost of circuit design. Utility Model Content

[0003] The main purpose of the utility model is to provide an isolation sampling circuit, a domain controller and a vehicle, aiming to reduce the cost of the signal sampling circuit.

[0004] The utility model provides an isolation sampling circuit, which is applied to a domain controller. The domain controller includes a main control circuit. The isolation sampling circuit includes: a unidirectional conduction circuit, wherein the first end of the unidirectional conduction circuit is used to connect to the power supply end, the second end of the unidirectional conduction circuit is used to connect to the load end, and the mutual connection point is used to access an external signal, wherein the external signal includes a conduction signal and a shutdown signal; the unidirectional conduction circuit is used to conduct the path between the load end and the power supply end when receiving the conduction signal through the second end, or to shut down the path between the load end and the power supply end when receiving the shutdown signal through the second end. a switching circuit, wherein an input end of the switching circuit is used to connect the power supply end, a controlled end of the switching circuit is connected to a first end of the unidirectional conducting circuit, and an output end of the switching circuit is connected to an input end of the main control circuit; the switching circuit is used to conduct the path between the power supply end and the main control circuit when the unidirectional conducting circuit is in a conducting state, and output a first sampling signal to the main control circuit, or to shut off the path between the power supply end and the main control circuit when the unidirectional conducting circuit is in an off state, and output a second sampling signal to the main control circuit.

[0005] Optionally, the unidirectional conduction circuit includes: an anti-reverse diode, the positive electrode of the anti-reverse diode is connected to the power supply end, the negative electrode of the anti-reverse diode is connected to the load end, and the interconnection point is used to access an external signal.

[0006] Optionally, the switching circuit includes: a transistor, the input end of the transistor is connected to the power supply end, the controlled end of the transistor is connected to the first end of the anti-reverse diode, and the output end of the transistor is connected to the input end of the main control circuit.

[0007] Optionally, the switch circuit includes: a MOS tube, the input end of the MOS tube is connected to the power supply end, the controlled end of the MOS tube is connected to the first end of the anti-reverse diode, and the output end of the MOS tube is connected to the input end of the main control circuit.

[0008] Optionally, the isolation sampling circuit also includes: a voltage divider circuit, the input end of the voltage divider circuit is connected to the power supply end, and the output end of the voltage divider circuit is connected to the first end of the unidirectional conduction circuit; the voltage divider circuit is used to output the voltage of the power supply end to the unidirectional conduction circuit after voltage division processing.

[0009] Optionally, the isolation sampling circuit also includes: a filter circuit, the input end of the filter circuit is connected to the power supply end, and the output end of the filter circuit is connected to the first end of the unidirectional conduction circuit; the filter circuit is used to output the voltage of the power supply end to the unidirectional conduction circuit after filtering.

[0010] Optionally, the isolation sampling circuit further includes: a pull-down circuit, the input end of the pull-down circuit is connected to the output end of the switch circuit, and the output end of the pull-down circuit is grounded; the pull-down circuit is used to keep the sampling signal output by the switch circuit in a low level state.

[0011] Optionally, the isolation sampling circuit also includes: a pull-up circuit, the input end of the pull-up circuit is used to connect to the working power supply, and the output end of the pull-up circuit is connected to the second end of the unidirectional conduction circuit; the pull-up circuit is used to keep the external signal input to the unidirectional conduction circuit in a high level state.

[0012] Optionally, the voltage divider circuit includes: a first resistor and a second resistor; the first end of the second resistor is connected to the power supply end, the second end of the second resistor is connected to the first end of the first resistor, and the mutual connection point is connected to the controlled end of the switching circuit; the second end of the first resistor is connected to the first end of the unidirectional conduction circuit.

[0013] The utility model also provides a domain controller, comprising a main control circuit and the isolation sampling circuit as described above.

[0014] The utility model also provides a vehicle, comprising the domain controller as described above.

[0015] The utility model proposes an isolated sampling circuit, a domain controller and a vehicle, wherein the domain controller includes a main control circuit, and the isolated sampling circuit includes a unidirectional conduction circuit and a switch circuit. The unidirectional conduction circuit is used to conduct the path between the load end and the power supply end when receiving a conduction signal via the second end, or to shut off the path between the load end and the power supply end when receiving a shutoff signal via the second end; the switch circuit is used to conduct the path between the power supply end and the main control circuit when the unidirectional conduction circuit is in a conduction state, and output a first sampling signal to the main control circuit, or to shut off the path between the power supply end and the main control circuit when the unidirectional conduction circuit is in a shutoff state, and output a second sampling signal to the main control circuit. The utility model adopts discrete devices to replace specific isolation ICs or isolation optocouplers to realize the isolated sampling function of the signal, thereby reducing the design cost of the signal sampling circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model 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, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a circuit flow chart of an isolated sampling circuit, a domain controller and a vehicle of the utility model;

[0018] Figure 2 This is a circuit structure diagram of an isolated sampling circuit, a domain controller and a vehicle according to the utility model.

[0019] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0023] It should be understood that in current domain control products, the digital signal acquisition circuit is mainly implemented using an RC filter circuit. The signal is filtered through the RC filter circuit, and the MCU collects the signal processed by the RC filter circuit to achieve signal sampling. In order to prevent external high voltage from damaging the internal sampling module of the MCU, the internal port of the MCU needs to have a voltage clamping function. Therefore, in the current process of designing digital signal acquisition circuits, not only external electrostatic protection needs to be considered, but the MCU also needs to have a port protection function, which increases the cost of circuit design.

[0024] Therefore, in order to reduce the cost of the signal sampling circuit and improve the flexibility of the signal sampling circuit, the utility model proposes an isolation sampling circuit, which is applied to a domain controller. The domain controller includes a main control circuit. Figure 1 , the isolation sampling circuit comprises:

[0025] A unidirectional conducting circuit 10, wherein a first end of the unidirectional conducting circuit 10 is used to connect to a power supply end VCC, a second end of the unidirectional conducting circuit 10 is used to connect to a load end, and a connection point between the unidirectional conducting circuit 10 is used to access an external signal, wherein the external signal includes a conduction signal and a shutdown signal;

[0026] The unidirectional conduction circuit 10 is used to conduct the path between the load terminal and the power supply terminal VCC when receiving the conduction signal through the second terminal, or to shut down the path between the load terminal and the power supply terminal VCC when receiving the shutoff signal through the second terminal;

[0027] A switch circuit 20, wherein the input end of the switch circuit 20 is used to connect to the power supply end VCC, the controlled end of the switch circuit 20 is connected to the first end of the unidirectional conducting circuit 10, and the output end of the switch circuit 20 is connected to the input end of the main control circuit;

[0028] The switch circuit 20 is used to conduct the path between the power supply terminal VCC and the main control circuit when the unidirectional conduction circuit 10 is in the on state, and output a first sampling signal to the main control circuit, or to shut off the path between the power supply terminal VCC and the main control circuit when the unidirectional conduction circuit 10 is in the off state, and output a second sampling signal to the main control circuit.

[0029] It is understandable that in the existing process of designing digital signal acquisition circuits, not only external electrostatic protection needs to be considered, but also the MCU needs to have port protection function, and its design cost is relatively high. In addition, most digital signal acquisition circuits do not have isolation function, and signal sampling is realized without signal isolation function, which is easy to cause damage to the device. Therefore, the utility model proposes an isolated sampling circuit, which reduces the cost of the signal sampling circuit by replacing a specific isolation IC or isolation optocoupler with discrete devices, such as using an anti-reverse diode D1, a transistor Q1 and some resistors and capacitors to filter, divide the voltage and isolate the signal, and the main control circuit collects the processed signal, thereby realizing signal sampling.

[0030] In this embodiment, the unidirectional conduction circuit 10 is implemented by an anti-reverse diode D1; the switch circuit 20 is implemented by a transistor Q1. Among them, the transistor Q1 can be one of a PNP transistor Q1 or an NPN transistor Q1. In practical applications, when the isolation sampling circuit is working normally, the external signal inputs a shutdown signal / on signal to the second end of the anti-reverse diode D1. The shutdown signal and the on signal correspond to a high level signal / low level signal, respectively. For example, when the shutdown signal is a high level signal, the on signal corresponds to a low level signal.

[0031] This embodiment is described by taking the shutdown signal as a high-level signal, the conduction signal as a low-level signal, and the transistor Q1 as a PNP-type transistor Q1 as an example. Specifically, when the shutdown signal is input to the second end of the anti-reverse diode D1, according to the characteristics of the anti-reverse diode D1, the anti-reverse diode D1 is cut off in the reverse direction. A return path cannot be formed between the power supply terminal VCC, the anti-reverse diode D1 and the load terminal, and the voltage difference between the controlled end and the input end of the transistor Q1 is 0, that is, the voltage difference between the base and the emitter of the transistor Q1 is 0, which does not meet the saturation zone working conditions of the PNP-type transistor Q1. The emitter and collector of the transistor Q1 are in an open circuit state, and the transistor Q1 outputs the second sampling signal to the main control circuit through the output terminal. Since the emitter and the collector are in an open circuit state, the second sampling signal corresponds to a 0V voltage, that is, the sampling signal collected by the main control circuit corresponds to a 0V voltage; when the conduction signal is input to the second end of the anti-reverse diode D1, according to the characteristics of the anti-reverse diode D1, the anti-reverse diode D1 is turned on. A return path is formed between the power supply terminal VCC, the anti-reverse diode D1 and the load terminal, and a voltage difference is generated between the controlled end and the input end of the transistor Q1, and the voltage difference reaches a preset value. That is, the voltage difference between the base and the emitter of the transistor Q1 is greater than 0.7V, which meets the saturation region working conditions of the PNP transistor Q1. The emitter and the collector of the transistor Q1 are in a short circuit state, and the transistor Q1 outputs the first sampling signal to the main control circuit through the output terminal. Since the emitter and the collector are in a short circuit state, the second sampling signal corresponds to the voltage of the power supply terminal VCC, that is, the sampling signal collected by the main control circuit corresponds to the voltage of the power supply terminal VCC.

[0032] The utility model proposes an isolated sampling circuit, which is applied to a domain controller. The domain controller includes a main control circuit. The isolated sampling circuit includes: a unidirectional conduction circuit 10 and a switch circuit 20. Among them, the first end of the unidirectional conduction circuit 10 is used to connect to the power supply end VCC, the second end of the unidirectional conduction circuit 10 is used to connect to the load end, and the mutual connection point is used to access the conduction signal / shutdown signal; the input end of the switch circuit 20 is used to connect to the power supply end VCC, the controlled end of the switch circuit 20 is connected to the first end of the unidirectional conduction circuit 10, and the output end of the switch circuit 20 is connected to the input end of the main control circuit. In practical applications, the unidirectional conducting circuit 10 is used to conduct the path between the load end and the power supply end VCC when receiving a conduction signal through the second end, or to shut off the path between the load end and the power supply end VCC when receiving a shutoff signal through the second end; the switch circuit 20 is used to conduct the path between the power supply end VCC and the main control circuit when the unidirectional conducting circuit 10 is in the conduction state, and output the first sampling signal to the main control circuit, or to shut off the path between the power supply end VCC and the main control circuit when the unidirectional conducting circuit 10 is in the shutoff state, and output the second sampling signal to the main control circuit. The utility model adopts discrete devices to replace specific isolation ICs or isolation optocouplers to achieve signal sampling, thereby reducing the design cost of the signal sampling circuit.

[0033] In one embodiment, referring to Figure 2 The one-way conducting circuit 10 includes: an anti-reverse diode D1, the positive electrode of the anti-reverse diode D1 is connected to the power supply terminal VCC, the negative electrode of the anti-reverse diode D1 is connected to the load terminal, and the interconnection point is used to access an external signal.

[0034] The switch circuit 20 includes: a transistor Q1, the input end of the transistor Q1 is connected to the power supply end VCC, the controlled end of the transistor Q1 is connected to the first end of the anti-reverse diode D1, and the output end of the transistor Q1 is connected to the input end of the main control circuit.

[0035] It can be understood that in this embodiment, the switch circuit 20 is implemented by a transistor Q1. The transistor Q1 can be one of a PNP transistor Q1 and an NPN transistor Q1. This embodiment is described by taking the shutdown signal as a high level signal, the conduction signal as a low level signal, the transistor Q1 as a PNP transistor Q1, and the unidirectional conduction circuit 10 as an anti-reverse diode D1 as an example.

[0036] Specifically, when the shutdown signal is input to the cathode of the anti-reverse diode D1, the anti-reverse diode D1 is cut off in the reverse direction. A return path cannot be formed between the power supply terminal VCC, the anti-reverse diode D1 and the load terminal, and the voltage difference between the base and the emitter of the transistor Q1 is 0, which does not meet the saturation zone working conditions of the PNP transistor Q1. The emitter and the collector of the transistor Q1 are in an open circuit state, and the sampling signal collected by the main control circuit corresponds to a 0V voltage; when the turn-on signal is input to the cathode of the anti-reverse diode D1, the anti-reverse diode D1 is turned on. A return path is formed between the power supply terminal VCC, the anti-reverse diode D1 and the load terminal, and the voltage difference between the base and the emitter of the transistor Q1 is greater than 0.7V, which meets the saturation zone working conditions of the PNP transistor Q1. The emitter and the collector of the transistor Q1 are in a short circuit state, and the sampling signal collected by the main control circuit corresponds to the voltage of the power supply terminal VCC.

[0037] In one embodiment, referring to Figure 2 , the switch circuit 20 comprises:

[0038] MOS tube, the input end of the MOS tube is connected to the power supply end VCC, the controlled end of the MOS tube is connected to the first end of the anti-reverse diode D1, and the output end of the MOS tube is connected to the input end of the main control circuit.

[0039] It is understandable that in this embodiment, the switch circuit 20 uses a MOS tube. This embodiment is described by taking the example that the off signal is a high level signal, the on signal is a low level signal, and the unidirectional conduction circuit 10 is an anti-reverse diode D1.

[0040] Specifically, when the shutdown signal is input to the cathode of the anti-reverse diode D1, the anti-reverse diode D1 is turned off in the reverse direction. A return path cannot be formed between the power supply terminal VCC, the anti-reverse diode D1 and the load terminal, and the voltage difference between the input terminal and the controlled terminal of the MOS tube is 0, that is, the voltage difference does not reach the preset voltage, and the conduction condition of the MOS tube cannot be met. The input terminal and the controlled terminal of the MOS tube are in an open circuit state, and the sampling signal collected by the main control circuit corresponds to a 0V voltage; when the conduction signal is input to the cathode of the anti-reverse diode D1, the anti-reverse diode D1 is turned on. A return path is formed between the power supply terminal VCC, the anti-reverse diode D1 and the load terminal, and the voltage difference between the input terminal and the controlled terminal of the MOS tube is greater than the preset voltage, which meets the conduction condition of the MOS tube. The input terminal and the controlled terminal of the MOS tube are in a short circuit state, and the sampling signal collected by the main control circuit corresponds to the voltage of the power supply terminal VCC.

[0041] In one embodiment, referring to Figure 2 , the isolation sampling circuit also includes:

[0042] A voltage divider circuit, wherein the input end of the voltage divider circuit is connected to the power supply end VCC, and the output end of the voltage divider circuit is connected to the first end of the unidirectional conducting circuit 10; the voltage divider circuit is used to output the voltage of the power supply end VCC to the unidirectional conducting circuit 10 after voltage division processing.

[0043] It can be understood that in this embodiment, the voltage of the power supply terminal VCC is 5V or 3.3V, and the voltage divider circuit is implemented by multiple resistors, which is used to divide the voltage of the power supply terminal VCC and output it to the controlled end of the switch circuit 20, so that a voltage difference is generated between the controlled end and the input end of the switch circuit 20. In practical applications, the switch circuit 20 is implemented by a PNP transistor Q1, and when the power supply terminal VCC, the voltage divider circuit, and the unidirectional conduction circuit 10 form a return path, the voltage divider circuit divides the voltage of the power supply terminal VCC and outputs it to the unidirectional conduction circuit 10 and the base of the transistor Q1 respectively, and the emitter of the transistor Q1 receives the voltage of the power supply terminal VCC. A voltage difference is generated between the base and the emitter of the transistor Q1, and the voltage difference is greater than 0.7V, which meets the saturation zone working conditions of the PNP transistor Q1, and the transistor Q1 is turned on. Since the emitter and collector of the transistor Q1 are in a short-circuit state, the sampling signal collected by the main control circuit is equivalent to the voltage of the power supply terminal VCC.

[0044] In one embodiment, referring to Figure 2 , the isolation sampling circuit also includes:

[0045] A filter circuit, wherein the input end of the filter circuit is connected to the power supply end VCC, and the output end of the filter circuit is connected to the first end of the unidirectional conduction circuit 10; the filter circuit is used to output the voltage of the power supply end VCC to the unidirectional conduction circuit 10 after filtering.

[0046] It can be understood that, in the present embodiment, the filter circuit is implemented by a filter capacitor C1, which has a relatively large capacity and a small resistance value, and can achieve good on-off performance for high-frequency signals, and mainly plays a role in signal filtering, reducing the noise and interference of the signal. In practical applications, the power supply terminal VCC outputs a voltage signal to the voltage divider circuit and the switch circuit 20, and the filter capacitor C1 performs on-off processing on the frequency of the voltage signal of the power supply terminal VCC to filter out high-frequency noise components and smooth the output voltage signal to the voltage divider circuit and the switch circuit 20. In addition, the filter capacitor C1 is also used to suppress voltage mutations caused by changes in the switch circuit 20. For example, when the voltage output of the switch circuit 20 changes dramatically, the filter capacitor C1 can ensure that the voltage output of the switch circuit 20 is stable, thereby ensuring that a stable voltage is output to the main control circuit. It should be understood that the voltage mentioned above refers to the sampling signal. When the switch circuit 20 outputs a sampling signal corresponding to a stable voltage, it can ensure that the main control circuit can stably collect signals.

[0047] In one embodiment, referring to Figure 2 , the isolation sampling circuit also includes:

[0048] A pull-down circuit, the input end of which is connected to the output end of the switch circuit 20, and the output end of which is grounded; the pull-down circuit is used to keep the sampling signal output by the switch circuit 20 in a low level state.

[0049] It can be understood that the pull-down circuit is used to adjust the output state of the isolated sampling circuit. In this embodiment, the pull-down circuit is implemented by a pull-down resistor R3, and the output end of the switch circuit 20 is connected to the ground end (negative power supply) through the pull-down resistor R3. When the switch circuit 20 is in an open circuit state and no signal is output, the potential output to the main control circuit will be pulled down to the negative power supply potential by the pull-down resistor R3, thereby ensuring the stability of the sampling signal input to the main control circuit.

[0050] For example, this embodiment is described by taking the shutdown signal as a high-level signal, the conduction signal as a low-level signal, and the transistor Q1 as a PNP-type transistor Q1. Specifically, when the shutdown signal is input to the second end of the anti-reverse diode D1, the anti-reverse diode D1 is cut off in the reverse direction. A return path cannot be formed between the power supply terminal VCC, the anti-reverse diode D1 and the load terminal, and the voltage difference between the base and the emitter of the transistor Q1 is 0, which does not meet the saturation zone working conditions of the PNP-type transistor Q1, and the emitter and collector of the transistor Q1 are in an open circuit state. Since the transistor Q1 is in an open circuit state and no signal is output, the pull-down resistor R3 pulls the potential of the collector of the transistor Q1 down to the negative power supply potential, and the level collected by the main control circuit is 0V at this time.

[0051] In one embodiment, referring to Figure 2 , the isolation sampling circuit also includes:

[0052] A pull-up circuit, wherein the input end of the pull-up circuit is used to connect to the working power supply VDD, and the output end of the pull-up circuit is connected to the second end of the unidirectional conduction circuit 10; the pull-up circuit is used to keep the external signal input to the unidirectional conduction circuit 10 in a high level state.

[0053] It can be understood that the pull-up circuit is used to adjust the input state of the isolated sampling circuit. In this embodiment, the pull-up circuit is implemented by a pull-up resistor R4, and the second end of the unidirectional conduction circuit 10 is connected to the working power supply VDD (positive power supply) through the pull-up resistor R4. When no signal is input to the unidirectional conduction circuit 10, the potential input to the unidirectional conduction circuit 10 will be pulled up to the positive power supply potential by the pull-up resistor R4, thereby ensuring the stability of the signal input to the unidirectional conduction circuit 10.

[0054] In one embodiment, referring to Figure 2 The voltage divider circuit includes: a first resistor R1 and a second resistor R2; a first end of the second resistor R2 is connected to the power supply end VCC, a second end of the second resistor R2 is connected to the first end of the first resistor R1, and the mutual connection point is connected to the controlled end of the switch circuit 20; the second end of the first resistor R1 is connected to the first end of the unidirectional conduction circuit 10.

[0055] It can be understood that, in this embodiment, the voltage divider circuit is composed of a first resistor R1 and a second resistor R2, and the first resistor R1 and the second resistor R2 are used to divide the voltage of the power supply terminal VCC and output it to the controlled end of the switch circuit 20, so that a voltage difference is generated between the controlled end and the input end of the switch circuit 20. For example, when the switch circuit 20 is implemented by a PNP transistor Q1, and the power supply terminal VCC, the voltage divider circuit, and the unidirectional conduction circuit 10 form a return path, the first resistor R1 and the second resistor R2 output the voltage of the power supply terminal VCC to the base of the transistor Q1, so that a voltage difference is generated between the base and the emitter of the transistor Q1, and the voltage difference is greater than 0.7V, which meets the saturation region working condition of the PNP transistor Q1, and the transistor Q1 is in a conducting state.

[0056] The utility model also provides a domain controller, comprising a main control circuit and the isolation sampling circuit as described above.

[0057] It can be understood that in this embodiment, the domain controller includes a main control circuit and an isolation sampling circuit. The isolation sampling circuit adopts discrete devices to replace specific isolation ICs or isolation optocouplers to achieve signal sampling and isolation, thereby reducing the design cost of the signal sampling circuit; the isolation sampling circuit can also select a suitable anti-reverse diode D1 and a voltage divider resistor according to the actual load current and voltage, and can flexibly configure the triode or MOS tube according to the input frequency to ensure the authenticity of the collected signal and the reliability of device protection.

[0058] The utility model also provides a vehicle, comprising the domain controller as described above.

[0059] It can be understood that in this embodiment, the domain controller is applied in the vehicle, and is mainly used to provide control signal input for the Hall sensors of the windows, the seats, the tailgate, etc. The domain controller of the utility model adopts discrete devices to replace specific isolation ICs or isolation optocouplers to achieve signal sampling and isolation, thereby reducing the design cost of the signal sampling circuit in the domain controller, and thus reducing the overall design cost of the vehicle.

[0060] The above embodiments are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An isolated sampling circuit, applied to a domain controller, wherein the domain controller includes a main control circuit, characterized in that: The isolation sampling circuit comprises: A unidirectional conducting circuit, wherein a first end of the unidirectional conducting circuit is used to connect to a power supply end, a second end of the unidirectional conducting circuit is used to connect to a load end, and a connection point between the two is used to access an external signal, wherein the external signal includes an on signal and an off signal; The unidirectional conduction circuit is used to conduct the path between the load end and the power supply end when receiving the conduction signal through the second end, or to shut down the path between the load end and the power supply end when receiving the shutoff signal through the second end; A switch circuit, wherein the input end of the switch circuit is used to connect to the power supply end, the controlled end of the switch circuit is connected to the first end of the unidirectional conduction circuit, and the output end of the switch circuit is connected to the input end of the main control circuit; The switch circuit is used to conduct the path between the power supply end and the main control circuit when the one-way conduction circuit is in the on state, and output a first sampling signal to the main control circuit, or to shut off the path between the power supply end and the main control circuit when the one-way conduction circuit is in the off state, and output a second sampling signal to the main control circuit.

2. The isolated sampling circuit according to claim 1, characterized in that: The unidirectional conducting circuit comprises: The anti-reverse diode has a positive electrode connected to the power supply end, a negative electrode connected to the load end, and a connection point between the anti-reverse diode and the load end, and an external signal is connected to the anti-reverse diode.

3. The isolated sampling circuit according to claim 2, characterized in that: The switch circuit comprises: A transistor, wherein the input end of the transistor is connected to the power supply end, the controlled end of the transistor is connected to the first end of the anti-reverse diode, and the output end of the transistor is connected to the input end of the main control circuit.

4. The isolated sampling circuit according to claim 2, characterized in that: The switch circuit comprises: A MOS tube, wherein the input end of the MOS tube is connected to the power supply end, the controlled end of the MOS tube is connected to the first end of the anti-reverse diode, and the output end of the MOS tube is connected to the input end of the main control circuit.

5. The isolated sampling circuit according to any one of claims 1 to 4, characterized in that: The isolation sampling circuit also includes: A voltage divider circuit, wherein the input end of the voltage divider circuit is connected to the power supply end, and the output end of the voltage divider circuit is connected to the first end of the unidirectional conducting circuit; the voltage divider circuit is used to output the voltage of the power supply end to the unidirectional conducting circuit after voltage division processing.

6. The isolated sampling circuit according to any one of claims 1 to 4, characterized in that: The isolation sampling circuit also includes: A filter circuit, wherein the input end of the filter circuit is connected to the power supply end, and the output end of the filter circuit is connected to the first end of the unidirectional conduction circuit; the filter circuit is used to output the voltage of the power supply end to the unidirectional conduction circuit after filtering.

7. The isolated sampling circuit according to any one of claims 1 to 4, characterized in that: The isolation sampling circuit also includes: A pull-down circuit, wherein the input end of the pull-down circuit is connected to the output end of the switch circuit, and the output end of the pull-down circuit is grounded; the pull-down circuit is used to keep the sampling signal output by the switch circuit in a low level state.

8. The isolated sampling circuit according to any one of claims 1 to 4, characterized in that: The isolation sampling circuit also includes: A pull-up circuit, wherein the input end of the pull-up circuit is used to connect to a working power supply, and the output end of the pull-up circuit is connected to the second end of the unidirectional conduction circuit; the pull-up circuit is used to keep an external signal input to the unidirectional conduction circuit in a high level state.

9. The isolated sampling circuit according to claim 5, characterized in that: The voltage divider circuit comprises: a first resistor and a second resistor; The first end of the second resistor is connected to the power supply end, the second end of the second resistor is connected to the first end of the first resistor, and the interconnection point is connected to the controlled end of the switch circuit; the second end of the first resistor is connected to the first end of the unidirectional conduction circuit.

10. A domain controller, characterized in that: It comprises a main control circuit and an isolation sampling circuit as claimed in any one of claims 1 to 9.

11. A vehicle, characterized in that: Comprising the domain controller as claimed in claim 10.

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