Sub-card in-place detection protection circuit, electronic equipment and system
By designing signal detection circuits and control circuits on the daughter card connector, and using multiple signal detection of dual Schottky diodes and field effect transistors, we ensure that the daughter card is correctly installed and powered on, solving the problem of the existing technology in the child card in position The problem of high detection error rate improves detection accuracy and safety.
Patent Information
- Application Number
- CN202420042529.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-05
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-01-05
AI Technical Summary
The prior art has a high misjudgment rate when detecting whether the daughter card is in position, especially due to misjudgment caused by interference or interruption of bus communication, and it is difficult to accurately detect the daughter card without physical in-position signal.
Design a daughter card in-position detection protection circuit, including daughter card connector, signal detection circuit, control circuit and switching circuit, and use dual Schottky diode and field effect transistor to perform multiple signal detection through grounding signals to ensure the correct daughter card Power supply is turned on after installation to reduce misjudgment.
The accuracy of the in-position detection of the daughter card is improved, the misjudgment rate is reduced, and the safety of the daughter card is ensured, and there is no need to add a detection signal generation device.
Smart Images
Figure CN222260042U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic equipment detection, in particular to a sub-card in-place detection protection circuit, electronic equipment and a system. Background Art
[0002] The construction of electronic devices and their hardware is usually quite complex, especially when multiple daughter cards are involved. As the core of the entire device, the motherboard often needs to be equipped with multiple different daughter cards to meet various functional requirements. These daughter cards can involve data processing, graphics rendering, network connection and other aspects, and each daughter card has its specific functions and roles. During the design process of the mother-daughter card product, it often happens that the daughter card is not installed in place or is reversed, resulting in malfunctions after the product is powered on, or even burning the daughter card.
[0003] However, most existing standard daughter cards are not designed with a presence signal. Traditional physical detection methods, such as detecting the status of the daughter card through specific pins or interfaces, are not applicable in this case. Therefore, engineers need to find other ways to detect. A common solution is to access through the bus. For example, the I2C (Inter-Integrated Circuit) bus allows software to communicate with the daughter card. This communication usually involves sending commands or data to the daughter card and then observing the response of the bus. If the bus responds, the software can determine that the daughter card is in place; if the bus does not respond, it may mean that the daughter card is not in place or there is a problem with the communication with the bus.
[0004] Although this method is not absolutely reliable, it provides a relatively effective way to detect the status of the daughter card when no other more direct methods are available. However, this method also has its limitations. For example, if the communication between the bus and the daughter card is disturbed or interrupted, it may cause false positives.
[0005] In general, for daughter cards that are not designed with physical presence signals, presence detection through software and bus communication is a feasible solution. However, in order to ensure the accuracy of the detection, engineers need to fully consider various possible influencing factors and take appropriate measures to reduce the possibility of misjudgment. Utility Model Content
[0006] In order to overcome the deficiencies of the prior art, the utility model provides a daughter card presence detection protection circuit, electronic equipment and system, which are used to reduce the misjudgment rate of daughter card presence detection and ensure the safety of the daughter card.
[0007] The utility model adopts a technical solution to solve its technical problem: a daughter card in-place detection protection circuit, the improvement of which lies in that it comprises: a daughter card connector, a signal detection circuit, a control circuit and a switch circuit, wherein: the daughter card connector is provided with N pins, N is a positive integer; the signal detection circuit comprises N connection ends, an input end and an output end, when a daughter card is plugged into the daughter card connector, the N connection ends are connected one by one with the N pins, the input end is connected to a power supply of a mother card for supplying power to the daughter card, the output end is connected to an input end of the control circuit, and is used to output a presence detection signal; the output end of the control circuit is connected to an input end of the switch circuit, and is used to control the opening or closing of the switch circuit according to the presence detection signal; the switch circuit is used to turn on or off the power supply of the daughter card.
[0008] The signal detection circuit in the above technical solution includes four chip resistors and two dual Schottky diodes with a common cathode; one end of the four chip resistors is connected to the power supply of the mother card for powering the daughter card, and the other end of the four chip resistors is connected to four detection signals and is also connected to the anode of the dual Schottky diode; the cathode of the dual Schottky diode is connected to the input end of the control circuit.
[0009] The four detection signals in the above technical solution are distributed on asymmetric corners of the daughter card connector.
[0010] The control circuit in the above technical solution includes a chip capacitor, a chip resistor and a first field effect transistor; one end of the chip capacitor is connected to the gate of the first field effect transistor and the output end of the signal detection circuit, and the other end of the chip capacitor is grounded; one end of the chip resistor is connected to the 12V power supply of the mother card, and the other end of the chip resistor is connected to the drain of the first field effect transistor; the source of the first field effect transistor is grounded.
[0011] The switching circuit in the above technical solution includes a chip resistor, a second field effect transistor and a third field effect transistor; the gate of the second field effect transistor is connected to the output end of the control circuit, and the source of the second field effect transistor is grounded; one end of the chip resistor is connected to the 12V power supply of the mother card, and the other end of the chip resistor is connected to the drain of the second field effect transistor and the gate of the third field effect transistor; the source of the third field effect transistor is connected to the 12V power supply of the mother card; and the drain of the third field effect transistor is connected to the 12V power supply of the daughter card.
[0012] In the above technical solution, the first field effect transistor and the second field effect transistor are N-channel field effect transistors; and the third field effect transistor is a P-channel field effect transistor.
[0013] The utility model solves the technical problem with the following solution: an electronic device, comprising the daughter card in-place detection protection circuit as described in any one of the above items.
[0014] The utility model solves the technical problem by adopting a solution: a sub-card in-place detection and protection system, comprising the electronic equipment described above.
[0015] The beneficial effects of the utility model are: there is no need to add any detection signal generating device, the grounding signal of the mother and child cards is used, dual Schottky diodes are applied for multi-path signal detection, the child card is inserted into the mother card connector, and grounding points in asymmetric positions are selected in different orientations as detection signals, ensuring that the power supply of the child card is turned on only after the child card is correctly installed, reducing the misjudgment rate of the child card in-place detection while ensuring the safety of the child card. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 A structural block diagram of a daughter card in-place detection protection circuit provided by the utility model;
[0018] Figure 2 A connection diagram of a daughter card in-place detection protection circuit provided by the utility model;
[0019] Figure 3 A schematic diagram of a daughter card connector in a daughter card in-place detection and protection circuit provided by the utility model;
[0020] Figure 4 A connection diagram of a daughter card in-place detection protection circuit provided by the utility model;
[0021] Figure 5 A connection diagram of a control circuit in a daughter card in-place detection protection circuit provided by the utility model;
[0022] Figure 6 The utility model provides a connection diagram of the switch circuit in the daughter card in-place detection protection circuit. DETAILED DESCRIPTION
[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0024] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.
[0025] like Figure 1-2 As shown, the utility model provides a daughter card in-place detection protection circuit, the daughter card in-place detection protection circuit 100 comprises: a daughter card connector 110, a signal detection circuit 120, a control circuit 130 and a switch circuit 140. Among them:
[0026] The daughter card connector is provided with N pins, where N is a positive integer;
[0027] The signal detection circuit 120 includes N connection terminals, an input terminal and an output terminal. When a daughter card is plugged into the daughter card connector, the N connection terminals are connected one by one to the N pins. The input terminal is connected to a power source of the mother card for powering the daughter card, and the output terminal is connected to the input terminal of the control circuit for outputting an in-place detection signal.
[0028] When all the pins on the mother card are connected to the ground level, different positions on the daughter card connector can be selected as signal detection pins for different scenarios, and different numbers of signal detection pins can also be selected.
[0029] In an exemplary embodiment, if Figure 3 As shown, the signal detection circuit 120 includes four chip resistors R1, R2, R3 and R4, and two dual Schottky diodes Q1 and Q2 with a common cathode; one end of the four chip resistors is connected to the 12V power supply of the mother card for powering the daughter card, and the other end of the four chip resistors is connected to four detection signals and is also connected to the anodes of the dual Schottky diodes Q1 and Q2; the cathode of the dual Schottky diode is connected to the input end of the control circuit 130.
[0030] In a possible implementation manner, the four detection signals are distributed at asymmetric corners of the daughter card connector. Figure 4As shown, taking two double-row 80-pin daughter card connectors as an example, in this circuit, only when the four detection signals are all low level, the cathodes of the two dual Schottky diodes Q1 and Q2 are low level; when any of the four detection signals is not low level (high level or floating), the cathodes of the two dual Schottky diodes Q1 and Q2 will be high level.
[0031] In an exemplary embodiment, if Figure 5 As shown, the control circuit 130 includes: a chip capacitor C2, a chip resistor R5 and a first field effect transistor Q3; one end of the chip capacitor C2 is connected to the gate of the first field effect transistor Q3 and the output end of the signal detection circuit 120, and the other end of the chip capacitor C2 is grounded; one end of the chip resistor R5 is connected to the 12V power supply of the mother card, and the other end of the chip resistor R5 is connected to the drain of the first field effect transistor Q3; the source of the first field effect transistor Q3 is grounded.
[0032] In a possible implementation manner, the first field effect transistor Q3 is an N-channel field effect transistor. When the gate of the N-channel field effect transistor is at a low level, the N-channel field effect transistor operates in a cut-off state, and the drain of the N-channel field effect transistor is at a high level, then the switch circuit 140 is turned on; when the gate of the N-channel field effect transistor is at a high level, the N-channel field effect transistor operates in a conduction state, and the drain of the N-channel field effect transistor is at a low level, then the switch circuit 140 is turned off.
[0033] In an exemplary embodiment, if Figure 6 As shown, the switching circuit 140 includes: a chip resistor R6, a second field effect transistor Q4 and a third field effect transistor Q5; the gate of the second field effect transistor Q4 is connected to the output end of the control circuit 130, and the source of the second field effect transistor Q4 is grounded; one end of the chip resistor R6 is connected to the 12V power supply of the mother card, and the other end of the chip resistor R6 is connected to the drain of the second field effect transistor Q4 and the gate of the third field effect transistor Q5; the source of the third field effect transistor Q4 is connected to the 12V power supply of the mother card; the drain of the third field effect transistor Q4 is connected to the 12V power supply of the daughter card.
[0034] In a possible implementation, the second field effect transistor Q4 is an N-channel field effect transistor, and the third field effect transistor Q5 is a P-channel field effect transistor. The P-channel field effect transistor can select a suitable device model according to the current requirement of the daughter card. The device model selected in this application is suitable for applications with a current below 3.5A. If it is greater than 3.5A, it is necessary to select a device with a larger current value, or connect two devices in parallel;
[0035] When the gate of the N-channel field effect transistor Q4 is at a high level, the N-channel field effect transistor Q4 works in the on state, and the drain of the N-channel field effect transistor Q4 is at a low level. At this time, the gate of the P-channel field effect transistor Q5 is at a low level, and the P-channel field effect transistor Q5 works in the on state, then the power switch is turned on, and the power supply of the sub-card is turned on;
[0036] When the gate of the N-channel field effect transistor Q4 is at a low level, the N-channel field effect transistor Q4 works in the cut-off state, and the drain of the N-channel field effect transistor Q4 is at a high level. At this time, the gate of the P-channel field effect transistor Q5 is at a high level, and the P-channel field effect transistor Q5 works in the cut-off state, then the power switch is turned off, and the power supply of the daughter card is turned off.
[0037] Through the above embodiments, when the daughter card is correctly installed, the DETECT1-DETECT4 signals are all connected to the ground, the two dual Schottky diodes Q1 and Q2 are both cut off, the first field effect transistor Q3 works in the cut-off state, the second field effect transistor Q4 works in the on state, the third field effect transistor Q5 also works in the on state, and the power supply of the daughter card is turned on; when the daughter card is not installed in place or is reversed, any one of the DETECT1-DETECT4 signals is not connected to the ground and is in a suspended state, the anode of the suspended Schottky diode is at a high level, the diode is turned on, the first field effect transistor Q3 works in the on state, the second field effect transistor Q4 works in the cut-off state, the third field effect transistor Q5 also works in the cut-off state, and the power supply of the daughter card is turned off.
[0038] like Figure 1 As shown, based on the above daughter card presence detection protection circuit, the utility model further provides an electronic device, and the electronic device 200 includes: the above daughter card presence detection protection circuit.
[0039] The electronic device provided by the utility model can accurately determine whether a daughter card is in place by identifying a presence detection signal, thereby avoiding misjudgment caused by a bus failure due to a daughter card abnormality when accessing the daughter card using the bus, thereby improving the accuracy of daughter card presence detection.
[0040] Based on the above electronic device, the utility model further provides a daughter card in-place detection and protection system, comprising the above electronic device 200.
[0041] The beneficial effects of the utility model are: there is no need to add any detection signal generating device, the grounding signal of the mother and child cards is used, dual Schottky diodes are applied for multi-path signal detection, the child card is inserted into the mother card connector, and grounding points in asymmetric positions are selected in different orientations as detection signals, ensuring that the power supply of the child card is turned on only after the child card is correctly installed, reducing the misjudgment rate of the child card in-place detection while ensuring the safety of the child card.
[0042] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A sub-card in-place detection protection circuit, characterized in that: include: A daughter card connector, a signal detection circuit, a control circuit, and a switch circuit, wherein: The daughter card connector is provided with N pins, where N is a positive integer; The signal detection circuit includes N connection terminals, an input terminal and an output terminal. When a daughter card is plugged into the daughter card connector, the N connection terminals are connected one by one with the N pins. The input terminal is connected to a power source of the mother card for supplying power to the daughter card. The output terminal is connected to the input terminal of the control circuit for outputting a presence detection signal. The output end of the control circuit is connected to the input end of the switch circuit, and is used to control the opening or closing of the switch circuit according to the presence detection signal; The switch circuit is used to turn on or off the power supply of the daughter card.
2. The daughter card presence detection protection circuit according to claim 1, characterized in that: The signal detection circuit includes four chip resistors and two dual Schottky diodes with a common cathode; One end of the four chip resistors is connected to the power supply of the mother card for powering the daughter card, and the other end of the four chip resistors is connected to four detection signals and is also connected to the anode of the dual Schottky diode; the cathode of the dual Schottky diode is connected to the input end of the control circuit.
3. The daughter card presence detection protection circuit according to claim 2, characterized in that: The four detection signals are distributed on asymmetric corners of the daughter card connector.
4. The daughter card presence detection protection circuit according to claim 1, characterized in that: The control circuit includes a chip capacitor, a chip resistor and a first field effect transistor; One end of the chip capacitor is connected to the gate of the first field effect tube and the output end of the signal detection circuit, and the other end of the chip capacitor is grounded; one end of the chip resistor is connected to the 12V power supply of the mother card, and the other end of the chip resistor is connected to the drain of the first field effect tube; the source of the first field effect tube is grounded.
5. The daughter card presence detection protection circuit according to claim 4, characterized in that: The switch circuit includes a chip resistor, a second field effect transistor and a third field effect transistor; The gate of the second field effect transistor is connected to the output end of the control circuit, and the source of the second field effect transistor is grounded; one end of the chip resistor is connected to the 12V power supply of the mother card, and the other end of the chip resistor is connected to the drain of the second field effect transistor and the gate of the third field effect transistor; the source of the third field effect transistor is connected to the 12V power supply of the mother card; and the drain of the third field effect transistor is connected to the 12V power supply of the daughter card.
6. The daughter card presence detection protection circuit according to claim 5, characterized in that: The first field effect transistor and the second field effect transistor are N-channel field effect transistors; the third field effect transistor is a P-channel field effect transistor.
7. An electronic device, characterized in that: include: A daughter card presence detection protection circuit as claimed in any one of claims 1 to 6.
8. A system, characterized in that: An electronic device comprising the electronic device described in claim 7.