CN215813278U - Connection state detection circuit and connection state detection system - Google Patents
Connection state detection circuit and connection state detection system Download PDFInfo
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- CN215813278U CN215813278U CN202121466889.4U CN202121466889U CN215813278U CN 215813278 U CN215813278 U CN 215813278U CN 202121466889 U CN202121466889 U CN 202121466889U CN 215813278 U CN215813278 U CN 215813278U
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Abstract
The application relates to an electronic control technology, and provides a connection state detection circuit and a connection state detection system, which comprise: a signal source circuit for providing a detection source signal indicative of the connection state; a detection control circuit for providing a detection control signal; the switch circuit is connected with the detection control circuit and the signal source circuit and is used for switching the switch state under the control of the detection control signal so as to output the detection source signal; a compensation circuit connected to the output of the switching circuit and including a negative temperature coefficient device coupled between the output of the switching circuit and ground. The compensation circuit provided with the negative temperature coefficient device is added, so that the transmitted detection source signal can be subjected to temperature compensation under the condition that the temperature change influences the stability of the signal, the stability and the accuracy of the signal in the whole signal transmission process are ensured, and the temperature self-adaptive capacity of the circuit and equipment is improved.
Description
Technical Field
The application belongs to the technical field of electronic control, and particularly relates to a connection state detection circuit and a connection state detection system.
Background
In the electrical field, the safety of high-voltage connection needs to be ensured for electric equipment or plants of a high-voltage system, such as electric vehicles, charging piles and the like. Aiming at the improvement of a high-voltage interlocking monitoring method in the existing market, a plurality of testing methods such as a voltage method, a constant current source method and a pulse method are adopted at present.
However, the methods have a common disadvantage that the self-adaptive capacity of the temperature is poor, occasionally communication data is lost, and further a control command of the high-voltage interlock monitoring cannot be received for a long time to cause a runaway condition, so that the safety requirements of the high-voltage system are not met.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a connection state detection circuit and a connection state detection system, and aims to solve the problems that the traditional high-voltage interlocking monitoring method is poor in temperature self-adaption capability and communication data are occasionally lost.
The present application provides in a first aspect a connection state detection circuit, including:
a signal source circuit for providing a detection source signal indicative of the connection state;
a detection control circuit for providing a detection control signal;
the switch circuit is connected with the detection control circuit and the signal source circuit and used for switching the switch state under the control of the detection control signal so as to transmit the detection source signal;
a compensation circuit connected to the output of the switching circuit and including a negative temperature coefficient device coupled between the output of the switching circuit and ground.
Optionally, the detection control circuit includes a controller, the compensation circuit further includes a detection module, the detection module is connected between the output of the switching circuit and the negative temperature coefficient device, the detection module is further connected to the controller and configured to detect a voltage amplitude of the detection source signal, and the controller determines whether the voltage amplitude of the detection source signal is abnormal according to the voltage amplitude.
Optionally, the detection module includes a first voltage-dividing resistor, a first end of the first voltage-dividing resistor is connected to the output of the switch circuit, a second end of the first voltage-dividing resistor is connected to the ground through the negative temperature coefficient device, and a second end of the first voltage-dividing resistor is further connected to the controller as the output of the detection module.
Optionally, the negative temperature coefficient device comprises at least one negative temperature coefficient semiconductor device.
Optionally, the semiconductor device is a diode, an anode of the diode is coupled to the output of the switching circuit, and a cathode of the diode is grounded.
Optionally, the switching circuit includes a first switching tube, a second switching tube and a voltage regulator, wherein a first conducting terminal of the first switching tube is connected to the output of the signal source circuit, the voltage regulator is connected between the first conducting terminal and a control terminal of the first switching tube, and a second conducting terminal of the first switching tube is connected to the output of the switching circuit; the first conduction end of the second switch tube is connected with the control end of the first switch tube through a first resistor, the control end of the second switch tube receives the detection control signal, and the second conduction end of the second switch tube is grounded.
A second aspect of the present application provides a connection state detection circuit, including:
the signal receiving circuit is used for receiving a detection source signal output by an external circuit and forming a detection receiving signal according to the detection source signal;
a compensation circuit connected to an output of the signal receiving circuit and including a negative temperature coefficient device coupled between the output of the signal receiving circuit and ground;
and the diagnosis circuit is connected with the output of the signal receiving circuit and used for receiving the detection receiving signal and outputting a detection signal indicating whether the connection state is abnormal or not according to the detection receiving signal.
Optionally, the compensation circuit further comprises a first voltage divider, and the first voltage divider and the negative temperature coefficient device are connected in series between the output of the signal receiving circuit and ground.
Optionally, the negative temperature coefficient device comprises at least one negative temperature coefficient semiconductor device.
Optionally, the semiconductor device is a diode, an anode of the diode is coupled to the output of the signal receiving circuit, and a cathode of the diode is grounded.
Optionally, the diagnostic circuit includes a power tube, a controller and a first resistor, the control end of the power tube is connected to the output of the signal receiving circuit, the first conducting end of the power tube is connected to a power supply, and the second conducting end is grounded through the first resistor and outputs the detection signal;
the controller is connected with the second conduction end of the power tube, receives the detection signal and determines whether the connection state is abnormal or not according to the level state of the detection signal.
Optionally, the signal receiving circuit includes a first PNP triode, a second resistor, and a third resistor, where an emitter of the first PNP triode is connected to the detection source signal, a base of the first PNP triode is connected to an emitter of the first PNP triode through the second resistor, and a collector of the first PNP triode is grounded through the third resistor; the emitting electrode of the second PNP triode is connected with the base electrode of the first PNP triode, the base electrode of the second PNP triode is grounded through the third resistor, and the collecting electrode of the second PNP triode is used as the output of the signal receiving circuit.
A third aspect of the present application provides a connection state detection system, including:
the connection state detection circuit as provided in the first aspect, provided to the first device; and
the connection state detection circuit as provided in the third aspect, provided to the second device;
the connection state detection circuit arranged on the first device is used for providing the detection source signal, and the connection state detection circuit arranged on the second device is used for receiving the detection source signal.
Above-mentioned connection state detection circuitry and connection state detecting system, the output detection received signal after the signal receiving circuit received the detection source signal, and the compensating circuit has then been added in signal receiving circuit's output, the negative temperature coefficient device has been set up in the compensating circuit, can make the detection received signal of transmission influence under the stable condition of signal in the temperature variation, can obtain temperature compensation, guarantee the stability and the accuracy of received signal, improve the adaptability of the temperature of circuit and equipment, and the condition of losing communication data can not appear, guarantee the safe connection between the equipment.
Drawings
Fig. 1 is a circuit block diagram of a connection status detection circuit according to an embodiment of the present application;
fig. 2 is a circuit block diagram of a connection status detection circuit according to a second embodiment of the present application;
fig. 3 is a circuit schematic diagram of a connection state detection circuit according to a second embodiment of the present application;
fig. 4 is a circuit block diagram of a connection status detection circuit according to a third embodiment of the present application;
fig. 5 is a circuit schematic diagram of a connection state detection circuit according to a third embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The connection state detection circuit provided in the embodiment of the present application is suitable for detecting a connection state between two electrical devices connected to each other, and therefore, the two electrical devices are respectively provided with a corresponding connection state detection circuit, for example, a first electrical device is provided with a connection state detection circuit for providing a detection source signal, a second electrical device is provided with a connection state detection circuit for receiving the detection source signal, the second electrical device receives a transmitted source signal through a connection link (for example, a combination of circuit board routing, cable, and connection interface), and then determines the connection state of the connection link according to the transmitted source signal. In the embodiment of the application, temperature compensation is added to at least one of the connection state detection circuits in the two electrical devices, so that the temperature flow and the temperature compensation of the transmission signal are realized; the stability and the accuracy of signals in the whole signal transmission process are ensured.
Referring to fig. 1, a first aspect of the present invention provides a connection status detection circuit for providing a detection source signal Ia, which includes a signal source circuit 11, a detection control circuit 12, a switch circuit 13 and a compensation circuit 14.
The signal source circuit 11 is configured to provide a detection source signal Ia indicating a connection state; the detection control circuit 12 is used for providing a detection control signal MCU _ CTRL; the switch circuit 13 is connected with the detection control circuit 12 and the signal source circuit 11, and is used for switching the switch state under the control of the detection control signal MCU _ CTRL to output a detection source signal Ia; the compensation circuit 14 is connected to the output of the switching circuit 13 and includes a negative temperature coefficient device 141 (see fig. 2), the negative temperature coefficient device 141 being coupled between the output of the switching circuit 13 and ground.
For example, when the ambient temperature changes from normal temperature to below low temperature (for example, -30 ℃), the voltage of the detection source signal Ia will drop after passing through the switch circuit 13, which may cause unstable signal transmission or even loss; then the negative temperature coefficient device 141 of the compensation circuit 14 can compensate the voltage appropriately; raising the voltage of the detection source signal Ia to ensure that the voltage of the detection source signal Ia is not influenced by the low external temperature; if the ambient temperature becomes high, the voltage of the detection source signal Ia can be reduced similarly, and the temperature compensation effect is achieved. Therefore, no matter how the ambient temperature changes, the detection source signal Ia provided by the circuit can be transmitted by proper or stable voltage, and is easy to receive and identify.
Referring to fig. 2, optionally, the detection control circuit 12 includes a controller, the compensation circuit 14 further includes a detection module 142, the detection module 142 is connected between the output of the switch circuit 13 and the negative temperature coefficient device 141, the detection module 142 is further connected to the controller, the detection module 142 is configured to detect a voltage amplitude of the detection source signal Ia, and the controller determines whether the voltage amplitude of the detection source signal Ia is abnormal according to the voltage amplitude. The setting detection module 142 may detect whether the detection source signal Ia is abnormal, so as not to affect the determination of the connection state of the connection link, and if the detection source signal Ia is abnormal, the determination of the connection state of the connection link may also be abnormal, so that the setting detection module 142 may improve the reliability of the connection state detection circuit. Specifically, the controller may be a single chip microcomputer, and determines whether the detection source signal Ia is abnormal according to the voltage amplitude of the detection source signal Ia, and outputs a relevant indication, such as directly lighting a relevant indicator lamp or driving a buzzer to sound, or outputting a relevant signal to the display panel to display a relevant state.
Referring to fig. 3, optionally, the detection module 142 includes a first voltage-dividing resistor R1, a first terminal of the first voltage-dividing resistor R1 is connected to the output of the switch circuit 13, a second terminal of the first voltage-dividing resistor R1 is connected to the ground through the negative temperature coefficient device 141, and a second terminal of the first voltage-dividing resistor R1 is also connected to the I/O port of the controller as the output of the detection module 142. When the ambient temperature is low, the voltage of the output of the detection module 142 will be increased, and the voltage of the detection source signal Ia will be increased; conversely, when the temperature is low or high, the voltage of the output of the detection module 142 will be decreased, and the voltage of the detection source signal Ia will be decreased. To compensate for the variations of temperature to the detected source signal Ia itself. Further, the detection module 142 further includes a second voltage-dividing resistor R2 connected in series between the first voltage-dividing resistor R1 and the negative temperature coefficient device 141, and the second voltage-dividing resistor R2 may be the negative temperature coefficient device 141 or may be a common constant value resistor.
Alternatively, the negative temperature coefficient device 141 includes at least one negative temperature coefficient semiconductor device. The semiconductor device can be made of metal oxides such as germanium, silicon, manganese, cobalt, nickel or copper and the like as main materials. When the ambient temperature is low, the resistance value is higher; as the ambient temperature increases, the resistance value decreases. In this embodiment, the semiconductor device is a diode, the anodes of the diodes D1 and D2 connected in series in the same direction are coupled to the output of the switch circuit 13, and the cathode is grounded.
Optionally, the switch circuit 13 includes a first switch transistor M1, a second switch transistor Q1 and a voltage regulator device D3, wherein a first conducting terminal of the first switch transistor M1 is connected to the output of the signal source circuit 11, the voltage regulator device D3 is connected between the first conducting terminal and the control terminal of the first switch transistor M1, and a second conducting terminal of the first switch transistor M1 is connected to the output of the switch circuit 13; a first conduction end of the second switching tube Q1 is connected to the control end of the first switching tube M1 through a first resistor R11, the control end of the second switching tube Q1 receives the detection control signal MCU _ CTRL, and a second conduction end of the second switching tube Q1 is grounded. The first switch tube M1 is a field effect transistor, the second switch tube Q1 is a triode, the voltage regulator D3 is a voltage regulator diode, and the voltage regulator diode is further connected in parallel with a divider resistor R3.
The switch circuit 13 is used for controlling the output of the detection source signal Ia, and the detection control signal MCU _ CTRL output through the pin of the controller controls the switch circuit 13, thereby controlling the output of the detection source signal Ia. Optionally, the controller receives the detection voltage output by the detection module 142 through the detection pin MCU _ I/O to determine whether the detection source signal Ia is normal, if so, the detection of the connection state may be continued, and if not, the above related indication may be output, and the detection control signal MCU _ CTRL turns off the switch circuit 13 to stop outputting the detection source signal Ia.
Optionally, the connection state detection circuit providing the detection source signal Ia further includes an output circuit 15, and the output circuit 15 is connected between the output of the switch circuit 13 and the ground, for filtering the detection source signal Ia to be output, and also for protection of electrostatic input. Optionally, the output circuit 15 comprises at least one capacitor connected between the output of the switching circuit 13 and ground. In the illustrated embodiment, the output circuit 15 is two capacitors C1, C2 connected in series; in other embodiments, the capacitor can be one capacitor or more than two capacitors connected in parallel.
In this embodiment, the signal source circuit 11 is used as a constant current source, and the provided inspection source signal is a constant current signal; in other embodiments, the signal source circuit 11 may also be a constant voltage source, or a pulse signal generating circuit.
Optionally, the signal source circuit 11 serving as a constant current source includes a first PNP transistor J1, a second PNP transistor J2, a second resistor R12, and a third resistor R13, wherein an emitter of the first PNP transistor J1 is connected to the power VCC, a base of the first PNP transistor J1 is connected to an emitter thereof through the second resistor R12, and a collector of the first PNP transistor J1 is grounded through the third resistor R13; the emitter of the second PNP transistor J2 is connected to the base of the first PNP transistor J1, the base of the second PNP transistor J2 is grounded through the third resistor R13, and the collector of the second PNP transistor J2 is used as the output of the signal source circuit 11. The current stabilizing function of the two transistors J1, J2 keeps the current outputted by the second PNP transistor J2 at a stable value, and the range of the outputted current can be adjusted by the second resistor R12, regardless of the variation of the voltage of the power source VCC.
In this embodiment, the connection state detection circuit for providing the detection source signal Ia provides a constant current detection source signal Ia through the signal source circuit 11, after the switch control circuit is turned on by controlling the switch circuit 13, the detection source signal Ia can be output externally, and during output, the detection source signal Ia can be subjected to temperature compensation through the compensation signal, so that the voltage of the detection source signal Ia has good stability, and in addition, the output circuit 15 can also filter the voltage. And the output circuit 15 can also have an electrostatic protection function on the output port of the connection state detection circuit. In addition, the detection module 142 can detect the output detection source signal Ia to determine whether there is an abnormality, so as to ensure that the detection source signal Ia provided by the entire connection state detection circuit is satisfactory.
A second aspect of the present application provides an electrical device including the above connection state detection circuit for providing the detection source signal Ia, the electrical device further includes a connection interface for connecting with an external device, and the connection state detection circuit loads the detection source signal Ia on a power line and/or a data line coupled to the connection interface, so that it can be used to detect whether a connection state of the electrical device and the external device through the connection interface is normal.
The electrical equipment loads the stable detection source signal Ia on the externally connected connecting link, so that the stability and the accuracy of the signal are ensured in the whole signal transmission process, the self-adaptive capacity of the temperature of the equipment is improved, the condition of losing communication data is avoided, and the safe connection between the equipment is ensured.
Referring to fig. 4, a third aspect of the present application provides a connection status detection circuit for receiving a detection source signal Ia, which includes a signal receiving circuit 21, a compensation circuit 22 and a diagnosis circuit 23.
The signal receiving circuit 21 is configured to receive a detection source signal Ia output by an external circuit (taking the connection state detection circuit for providing the detection source signal Ia as an example) and form a detection receiving signal Ib according to the detection source signal Ia; the compensation circuit 22 is connected to the output of the signal receiving circuit 21 and includes a negative temperature coefficient device 221 (see fig. 5), wherein the negative temperature coefficient device 221 is coupled between the output of the signal receiving circuit 21 and the ground; the diagnostic circuit 23 is connected to an output of the signal receiving circuit 21, and is configured to receive the detection reception signal Ib and output a detection signal indicating whether the connection state is abnormal or not, based on the detection reception signal Ib.
For example, when the ambient temperature changes from normal temperature to below low temperature (for example, -30 ℃), the voltage of the detection receiving signal Ib output by the signal receiving circuit 21 may decrease, which may cause unstable and even lost signal transmission; then the negative temperature coefficient device 221 of the compensation circuit 22 can properly compensate the voltage; raising the voltage of the detection receiving signal Ib to ensure that the voltage of the detection receiving signal Ib is not influenced by the reduction of the external temperature; if the ambient temperature becomes high, the voltage of the detection receiving signal Ib can be reduced similarly, and the temperature compensation effect is further achieved. In this way, the present circuit can appropriately or stably be recognized by the diagnosis circuit 23 based on the detection reception signal Ib supplied from the received detection source signal Ia regardless of the change in the ambient temperature.
Referring to fig. 5, the compensation circuit 22 further includes a first voltage divider R4, and the first voltage divider R4 and the negative temperature coefficient device 221 are connected in series between the output of the signal receiving circuit 21 and ground. When the ambient temperature is low, the voltage of the detection reception signal Ib of the output of the signal reception circuit 21 will be raised; conversely, when the ambient temperature is low or high, the voltage of the detection reception signal Ib outputted from the signal reception circuit 21 is lowered to compensate for the change of the temperature change to the detection reception signal Ib itself.
Optionally, the negative temperature coefficient device 221 includes at least one negative temperature coefficient semiconductor device. The semiconductor device can be made of metal oxides such as germanium, silicon, manganese, cobalt, nickel or copper and the like as main materials. When the ambient temperature is low, the resistance value is higher; as the ambient temperature increases, the resistance value decreases. In this embodiment, the semiconductor devices are diodes D11 and D12, anodes of the diodes D11 and D12 are coupled to the output of the signal receiving circuit 21, and cathodes thereof are grounded.
Referring to fig. 5, optionally, the diagnosis circuit 23 includes a power transistor Q2 and a resistor R21, a control terminal of the power transistor Q2 is connected to the output of the signal receiving circuit 21, a first conducting terminal of the power transistor Q2 is connected to the power supply Vcc, a second conducting terminal is connected to the ground through the resistor R21, and a detection signal is output. Optionally, the diagnostic circuit 23 further includes an input resistor R22 connected between the control terminal of the power transistor Q2 and the output of the signal receiving circuit 21, an output resistor R23 connected in series to the second conducting terminal of the power transistor Q2, and a capacitor C5 connected between the output of the diagnostic circuit 23 and ground, the capacitor being used for filtering and voltage stabilization. The power transistor Q2 may be an NPN transistor.
Optionally, the diagnostic circuit 23 further includes a controller, the controller is connected to the second conducting terminal of the power transistor Q2, and receives the detection signal, and the controller determines whether the connection state is abnormal according to a level state of the detection signal. Specifically, the controller may determine whether the connection link is abnormal according to the level state of the detection signal, and output a relevant indication, such as directly lighting a relevant indicator lamp or driving a buzzer to sound, or output a relevant signal to the display panel to display the relevant state.
In this embodiment, the signal receiving circuit 21 is a constant current source, and the received inspection source signal provides a power supply for the signal receiving circuit 21; in other embodiments, the signal receiving circuit 21 may also be a constant voltage source, or a pulse signal generating circuit.
Referring to fig. 5, optionally, the signal receiving circuit 21 serving as a constant current source includes a PNP transistor J3, a PNP transistor J4, a resistor R24, and a resistor R25, wherein an emitter of the PNP transistor J3 is connected to the detection source signal Ia, a base of the PNP transistor J3 is connected to an emitter thereof through a resistor R24, and a collector of the PNP transistor J3 is grounded through a resistor R25; the emitter of the PNP triode J4 is connected to the base of the PNP triode J3, the base of the PNP triode J4 is grounded through the resistor R25, and the collector of the PNP triode J4 is used as the output of the signal receiving circuit 21. The signal receiving circuit 21 keeps the current output by the PNP transistor J4 at a stable value regardless of the voltage variation of the detection source signal Ia, and the output current range can be adjusted by the resistor R24. It is to be understood that if an abnormality, such as disconnection, occurs in the connection link, the voltage of the detection source signal Ia is zero, the voltage of the detection reception signal Ib at the output of the signal reception circuit 21 is also zero, the power tube Q2 of the diagnosis circuit 23 is turned off, and the output thereof is at a low level. If the connection link is normal, the signal receiving circuit 21 receives the external detection source signal Ia, and it can output a high-level detection receiving signal Ib, at this time, the power tube Q2 of the driving diagnosis circuit 23 is turned on, and a high-level signal indicating that the connection link is normal is output.
Optionally, the connection state detection circuit for receiving the detection source signal Ia further includes an input circuit 24, and the input circuit 24 is connected between the input of the signal receiving circuit 21 and the ground for filtering and electrostatic input protection of the detection source signal Ia. Optionally, the input circuit 24 comprises at least one capacitor connected between the input of the signal receiving circuit 21 and ground. In the illustrated embodiment, the output circuit 15 is two capacitors C3, C4 connected in series; in other embodiments, the capacitor can be one capacitor or more than two capacitors connected in parallel.
The present application provides in a fourth aspect an electrical device provided with a connection status detection circuit for receiving a detection source signal Ia, including an interface, where the interface may be used to interface with a connection interface of an external device including the connection status detection circuit for providing the detection source signal Ia, and after the interface is interfaced, the connection status detection circuit in the electrical device receives the detection source signal Ia transmitted by the external device through a connection link from a power line and/or a data line coupled to the interface.
This electrical equipment is from the detection source letter that will connect interface on the link and receive external equipment transmission and come, through constant current and temperature compensation, guarantees whole signal transmission in-process, the stability and the accuracy of signal improve the self-adaptation ability of the temperature of equipment, and the condition that can not appear losing communication data guarantees the safe connection between the equipment.
A fifth aspect of the present application provides a connection state detection system, including:
a connection state detection circuit, provided in the first apparatus, for providing the detection source signal Ia as provided in the first aspect of the embodiment of the present application; and
the connection state detection circuit provided in the second apparatus and used for receiving the detection source signal Ia as provided in the third aspect of the embodiment of the present application.
The first device and the second device may be electrical apparatuses, or electronic apparatuses.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (13)
1. A connection state detection circuit, comprising:
a signal source circuit for providing a detection source signal indicative of the connection state;
a detection control circuit for providing a detection control signal;
the switch circuit is connected with the detection control circuit and the signal source circuit and used for switching the switch state under the control of the detection control signal so as to transmit the detection source signal;
a compensation circuit connected to the output of the switching circuit and including a negative temperature coefficient device coupled between the output of the switching circuit and ground.
2. The connection state detection circuit of claim 1, wherein the detection control circuit comprises a controller, the compensation circuit further comprises a detection module connected between the output of the switching circuit and the negative temperature coefficient device, the detection module is further connected to the controller for detecting a voltage amplitude of the detection source signal, and the controller determines whether the voltage amplitude of the detection source signal is abnormal according to the voltage amplitude.
3. The connection status detecting circuit according to claim 2, wherein the detecting module includes a first voltage dividing resistor, a first terminal of the first voltage dividing resistor is connected to the output of the switching circuit, a second terminal of the first voltage dividing resistor is connected to the ground through the negative temperature coefficient device, and a second terminal of the first voltage dividing resistor is further connected to the controller as the output of the detecting module.
4. The connection state detection circuit according to any one of claims 1 to 3, wherein the negative temperature coefficient device includes at least one negative temperature coefficient semiconductor device.
5. The connection state detection circuit according to claim 4, wherein the semiconductor device is a diode, an anode of the diode is coupled to the output of the switching circuit, and a cathode thereof is grounded.
6. The connection status detecting circuit according to any one of claims 1 to 3, wherein the switching circuit comprises a first switching tube, a second switching tube and a voltage stabilizing device, wherein a first conducting terminal of the first switching tube is connected to the output of the signal source circuit, the voltage stabilizing device is connected between the first conducting terminal and a control terminal of the first switching tube, and a second conducting terminal of the first switching tube is connected to the output of the switching circuit; the first conduction end of the second switch tube is connected with the control end of the first switch tube through a first resistor, the control end of the second switch tube receives the detection control signal, and the second conduction end of the second switch tube is grounded.
7. A connection state detection circuit, comprising:
the signal receiving circuit is used for receiving a detection source signal output by an external circuit and forming a detection receiving signal according to the detection source signal;
a compensation circuit connected to an output of the signal receiving circuit and including a negative temperature coefficient device coupled between the output of the signal receiving circuit and ground;
and the diagnosis circuit is connected with the output of the signal receiving circuit and used for receiving the detection receiving signal and outputting a detection signal indicating whether the connection state is abnormal or not according to the detection receiving signal.
8. The connection-state detection circuit of claim 7, wherein the compensation circuit further comprises a first voltage divider, the first voltage divider and the negative temperature coefficient device being connected in series between the output of the signal-receiving circuit and ground.
9. The connection state detection circuit according to claim 7, wherein the negative temperature coefficient device includes at least one negative temperature coefficient semiconductor device.
10. The connection state detection circuit according to claim 9, wherein the semiconductor device is a diode, an anode of the diode is coupled to the output of the signal reception circuit, and a cathode thereof is grounded.
11. The connection status detecting circuit according to any one of claims 7 to 10, wherein the diagnostic circuit includes a power tube, a controller and a first resistor, a control terminal of the power tube is connected to the output of the signal receiving circuit, a first conducting terminal of the power tube is connected to a power supply, a second conducting terminal of the power tube is connected to ground through the first resistor, and the detection signal is output;
the controller is connected with the second conduction end of the power tube, receives the detection signal and determines whether the connection state is abnormal or not according to the level state of the detection signal.
12. The connection state detection circuit according to any one of claims 7 to 10, wherein the signal receiving circuit includes a first PNP transistor, a second resistor, and a third resistor, wherein an emitter of the first PNP transistor is connected to the detection source signal, a base of the first PNP transistor is connected to an emitter thereof through the second resistor, and a collector of the first PNP transistor is grounded through the third resistor; the emitting electrode of the second PNP triode is connected with the base electrode of the first PNP triode, the base electrode of the second PNP triode is grounded through the third resistor, and the collecting electrode of the second PNP triode is used as the output of the signal receiving circuit.
13. A connection state detection system, comprising:
a connection state detection circuit according to any one of claims 1 to 6 provided in the first device; and
a connection state detection circuit according to any one of claims 7 to 12 provided in the second device;
the connection state detection circuit arranged on the first device is used for providing the detection source signal, and the connection state detection circuit arranged on the second device is used for receiving the detection source signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121466889.4U CN215813278U (en) | 2021-06-29 | 2021-06-29 | Connection state detection circuit and connection state detection system |
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| CN202121466889.4U CN215813278U (en) | 2021-06-29 | 2021-06-29 | Connection state detection circuit and connection state detection system |
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| CN215813278U true CN215813278U (en) | 2022-02-11 |
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