Latch holding circuit and driving circuit

Abstract

The utility model provides a latch holding circuit and a driving circuit, and relates to the technical field of vehicle body control. Since the first driving module sends the first driving signal before the control module in the driving circuit breaks down, the first signal conversion module can still receive the first driving signal when the control module breaks down, and the first signal conversion module can send the second enabling signal at the moment, so that the first signal conversion module can still receive the second enabling signal. At this time, the first driving module can still send the first driving signal. The cycle is repeated, under the condition that the control module breaks down, the first driving module can still send the first driving signal, that is, the first load can still be driven, and therefore the control reliability of the first load is improved. And the first load can be a vehicle body electric appliance, so that the latch holding circuit provided by the utility model improves the control reliability of the vehicle body electric appliance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of vehicle body control, especially to a latch holding circuit and driving circuit. BACKGROUND

[0002] At present, the vehicle body controller refers to the electronic control unit of controlling vehicle body electric appliance, and it can control the devices such as vehicle lamp, vehicle door, vehicle window, rearview mirror, air conditioner, central locking etc.

[0003] The control of vehicle body controller to vehicle body electric appliance mainly depends on the control module in vehicle body controller, if the control module fails, for example, the software program of control module runs error, that is, the vehicle body controller loses the control to vehicle body electric appliance, then the driver cannot control vehicle body electric appliance, thereby possibly causing the influence to the driving safety.

[0004] Therefore, how to improve the control reliability of vehicle body electric appliance is a technical problem to be solved urgently. UTILITY MODEL CONTENT

[0005] Therefore, the utility model provides a latch holding circuit and driving circuit to improve the control reliability of vehicle body electric appliance.

[0006] In order to realize the above-mentioned purpose, the utility model embodiment provides the following technical scheme:

[0007] One aspect of the present application provides a latch holding circuit, comprising: a first driving module and a first signal conversion module, wherein:

[0008] The first input end of the first driving module is connected with the first output end of the control module in the driving circuit as the input end of the latch holding circuit, and receives the first enable signal;

[0009] The output end of the first driving module is connected with the first load as the output end of the latch holding circuit;

[0010] The input end of the first signal conversion module is connected with the output end of the first driving module, and the output end of the first signal conversion module is connected with the second input end of the first driving module;

[0011] The first driving module sends the first driving signal under the condition that the first driving module receives the first enable signal or the second enable signal; the first driving signal is the signal for driving the first load;

[0012] The default operation mode of the first signal conversion module is that the first signal conversion module sends the second enable signal under the condition that the first signal conversion module receives the first driving signal.

[0013] Optionally, the first signal conversion module comprises two switch tubes and four resistors.

[0014] One end of the first resistor is an input end of the first signal conversion module.

[0015] The other end of the first resistor is connected to one end of the second resistor, and the connection point is connected to one end of the first switch tube.

[0016] The other end of the first switch tube is an output end of the first signal conversion module.

[0017] The other end of the second resistor is connected to the control end of the first switch tube, and the connection point is connected to one end of the second switch tube through the third resistor.

[0018] The other end of the second switch tube is grounded.

[0019] The control end of the second switch tube is connected to one end of the fourth resistor.

[0020] The other end of the fourth resistor is connected to the output end of the first power supply, and the first power supply is a power supply that can output a power to turn on the second switch tube.

[0021] The second resistor is a resistor that can generate a voltage to turn on the first switch tube when the second switch tube is turned on.

[0022] Optionally, the first signal conversion module further comprises a first anti-reverse branch.

[0023] The cathode of the first anti-reverse branch is connected to the connection point of the first resistor and the second resistor, and the anode of the first anti-reverse branch is grounded.

[0024] Another aspect of the present application provides a driving circuit, comprising a control module and a latch holding circuit as any one of the previous aspects of the present application.

[0025] Optionally, it further comprises an SBC chip, a second driving module and a second signal conversion module.

[0026] The input end of the SBC chip is connected to the second output end of the control module to receive a heartbeat signal.

[0027] The output end of the SBC chip is connected to the input end of the second signal conversion module.

[0028] The output end of the second signal conversion module is connected to the input end of the second driving module.

[0029] The input end of the second driving module is connected to the third output end of the control module to receive a third enable signal.

[0030] The output end of the second driving module is connected with a second load, and the second driving module sends a second driving signal in the case that the third enabling signal is received by itself; the second driving signal is a signal for driving the second load;

[0031] The SBC chip sends a pilot signal in the case that the heartbeat signal is not received by itself;

[0032] The second signal conversion module sends the third enabling signal in the case that the pilot signal is received by itself.

[0033] Optionally, the second signal conversion module comprises a third switch tube and two resistors; wherein:

[0034] One end of the third switch tube is connected with the output end of a second power supply;

[0035] The other end of the third switch tube is connected with one end of a fifth resistor and one end of a sixth resistor respectively;

[0036] The other end of the fifth resistor is grounded;

[0037] The other end of the sixth resistor serves as the output end of the second signal conversion module;

[0038] The control end of the third switch tube serves as the input end of the second signal conversion module, and the third switch tube is a switch tube that is turned on in the case that the pilot signal is received by the control end.

[0039] Optionally, the application further comprises two anti-reverse branches; wherein:

[0040] The anode of a third anti-reverse branch is connected with the output end of the second signal conversion module, and the cathode of the third anti-reverse branch is connected with the input end of the second driving module;

[0041] The anode of a fourth anti-reverse branch is connected with the third output end of the control module, and the cathode of the fourth anti-reverse branch is connected with the input end of the second driving module.

[0042] Optionally, the application further comprises a third driving module and a third signal conversion module; wherein:

[0043] The output end of the SBC chip is further connected with the first input end of the third signal conversion module;

[0044] The second input end of the third signal conversion module receives a target signal;

[0045] The output end of the third signal conversion module is connected with the input end of the third driving module;

[0046] The input end of the third driving module is connected with the fourth output end of the control module, and receives a fourth enable signal;

[0047] The output end of the third driving module is connected with a third load, and the third driving module sends a third driving signal in the case that the fourth enable signal is received by itself; the third driving signal is a signal for driving the third load;

[0048] The third signal conversion module sends the fourth enable signal in the case that the conducting signal and the target signal are received by itself.

[0049] Optionally, the third signal conversion module comprises two switch tubes and four resistors; wherein:

[0050] One end of the seventh resistor serves as a second input end of the third signal conversion module, and one end of the eighth resistor is connected with the output end of the third power supply;

[0051] The other end of the seventh resistor is connected with the other end of the eighth resistor, and the connecting point is connected with the control end of the fourth switch tube;

[0052] One end of the fourth switch tube is connected with the output end of the third power supply;

[0053] The other end of the fourth switch tube is connected with one end of the fifth switch tube;

[0054] The other end of the fifth switch tube is connected with one end of the ninth resistor, and the connecting point is connected with one end of the tenth resistor;

[0055] The other end of the ninth resistor is grounded, and the other end of the tenth resistor serves as an output end of the third signal conversion module;

[0056] The eighth resistor is a resistor which can make the fourth switch tube conductive by itself.

[0057] The control end of the fifth switch tube serves as a first input end of the third signal conversion module; the fifth switch tube is a switch tube which is conductive in the case that the conducting signal is received by itself.

[0058] Optionally, the control module further comprises two anti-reverse branches; wherein:

[0059] The anode of the fifth anti-reverse branch is connected with the fifth control end of the control module, and the cathode of the fifth anti-reverse branch is connected with the input end of the third driving module;

[0060] The anode of the sixth anti-reverse branch is connected with the output end of the third signal conversion module, and the cathode of the sixth anti-reverse branch is connected with the input end of the third driving module.

[0061] The utility model provides a latch holding circuit, because the first drive module sends the first drive signal before the control module in the drive circuit fails, so when the control module fails, the first signal conversion module can still receive the first drive signal, so that the first signal conversion module can send the second enable signal at this time, and then the first drive module can still send the first drive signal at this time. Cycle, in the case of control module failure, the first drive module can still send the first drive signal, that is, the first load can still be driven, thereby improving the control reliability of the first load. Since the first load can be a vehicle body electric appliance, the latch holding circuit provided by the application improves the control reliability of the vehicle body electric appliance. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only part of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0063] Figures 1-6 The structure schematic diagram of six kinds of implementation modes of the drive circuit provided by the embodiment of the present application is respectively shown. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0065] In the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the element defined by the sentence "including a…" does not exclude the existence of other identical elements in the process, method, article or equipment including the element.

[0066] In order to improve the control reliability of the vehicle body electrical appliances, another embodiment of the present application provides a latch holding circuit, the specific structure of which is shown in Figure 1 The connection relationship between the modules is described as follows.

[0067] The first input end of the first driving module 10 is connected with the first output end of the control module 30 in the driving circuit as the input end of the latch holding circuit, and receives the first enable signal EN1.

[0068] It should be noted that if the control module 30 does not fail, the control module 30 can send the first enable signal EN1 to the first driving module 10, that is, the first input end of the first driving module 10 can receive the first enable signal EN1. If the control module 30 fails, for example, the software program running in the control module 30 is wrong, the control module 30 cannot send the first enable signal EN1 to the first driving module 10, that is, the first input end of the first driving module 10 cannot receive the first enable signal EN1.

[0069] The output end of the first driving module 10 is connected with the first load 01 as the output end of the latch holding circuit.

[0070] The input end of the first signal conversion module 20 is connected with the output end of the first driving module 10, and the output end of the first signal conversion module 20 is connected with the second input end of the first driving module 10.

[0071] The first driving module 10 outputs the first driving signal QU1 when it receives the first enable signal EN1 or the second enable signal EN2 itself, in other words, the first driving module 10 outputs the first driving signal QU1 when it receives the first enable signal EN1 at its first input end, or outputs the first driving signal QU1 when it receives the second enable signal EN2 at its second input end.

[0072] The first driving signal QU1 is a signal for driving the first load 01. Since the first driving signal QU1 is a signal for driving the first load 01, the first driving module 10 drives the first load 01 by outputting the first driving signal QU1 to the first load 01.

[0073] The default operation mode of the first signal conversion module 20 is to output the second enable signal EN2 when it receives the first driving signal QU1 itself.

[0074] Since the first input end of the first driving module 10 can receive the first enable signal EN1 when the control module 30 does not fail, the first driving module 10 can output the first driving signal QU1, that is, can drive the first load 01.

[0075] Since the first driving module 10 outputs the first driving signal QU1 before the control module 30 fails, when the control module 30 fails, the first signal conversion module 20 can still receive the first driving signal QU1, so that the first signal conversion module 20 can output the second enable signal EN2 at this time, that is, the first driving module 10 can receive the second enable signal EN2 at this time, and then the first driving module 10 can still output the first driving signal QU1. In this way, in the case of failure of the control module 30, the first driving module 10 can still output the first driving signal QU1, that is, the first load 01 can still be driven, thereby improving the control reliability of the first load 01. Since the first load 01 can be a vehicle body electrical appliance, the latch holding circuit provided by the present application improves the control reliability of the vehicle body electrical appliance.

[0076] In addition, the inhibit terminal of the first signal conversion module 20 is connected with the fifth output terminal of the control module 30 to receive an inhibit signal SR. When the first signal conversion module 20 receives the inhibit signal SR, the first signal conversion module 20 no longer operates in the default operation mode, that is, the first signal conversion module 20 does not output a signal.

[0077] Since the first signal conversion module 20 does not output a signal when it receives the inhibit signal SR, in the case that the first signal conversion module 20 receives the inhibit signal SR, if the control module 30 fails, the first driving module 10 cannot receive the first enable signal EN1 and the second enable signal EN2, so that the first driving module 10 cannot output the first driving signal QU1, that is, the first load 01 cannot be driven.

[0078] Another embodiment of the present application provides a specific implementation mode of the first signal conversion module 20, which has a specific structure as shown in Figure 1 The specific implementation mode of the first signal conversion module 20 specifically includes a first switch tube M1, a second switch tube M2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The connection relationship between the devices is specifically described as follows:

[0079] One end of the first resistor R1 serves as an input terminal of the first signal conversion module. The other end of the first resistor R1 is connected with one end of the second resistor R2, and the connection point is connected with one end of the first switch tube M1. The other end of the first switch tube M1 serves as an output terminal of the first signal conversion module 20.

[0080] The other end of the second resistor R2 is connected with the control terminal of the first switch tube M1, and the connection point is connected with one end of the second switch tube M2 through the third resistor R3. The other end of the second switch tube M2 is connected with GND.

[0081] The control end of the second switch tube M2 is connected with one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected with the first power supply VCC1.

[0082] The first power supply VCC1 is a power supply which can make the second switch tube M2 conductive by itself output.

[0083] Since the first power supply VCC1 is a power supply which can make the second switch tube M2 conductive by itself output, the second switch tube M2 is conductive. In the case that the second switch tube M2 is conductive, one end of the series branch formed by the first resistor R1, the second resistor R2 and the third resistor R3 receives the first drive signal QU1, and the other end is grounded, that is, the first resistor R1, the second resistor R2 and the third resistor R3 are divided, and since the second resistor R2 is a resistor which can make the first switch tube M1 conductive by itself voltage division in the case that the second switch tube M2 is conductive, the first switch tube M1 is conductive, so that the potential of the output end of the first signal conversion module 20 is equal to the potential of the first drive signal QU1 minus the voltage division of the first resistor R1, that is, the output end of the first signal conversion module 20 outputs the second enable signal EN2.

[0084] It should be noted that since the first resistor R1, the second resistor R2 and the third resistor R3 are divided in the case that the second switch tube M2 is conductive, as long as the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 are reasonably set, the voltage division of the second resistor R2 can make the first switch tube M1 conductive.

[0085] In addition, the inhibition signal SR received by the first signal conversion module 20 is a signal which cannot make the second switch tube M2 conductive.

[0086] Since the inhibition signal SR received by the first signal conversion module 20 is a signal which cannot make the second switch tube M2 conductive by itself potential, if the first signal conversion module 20 receives the inhibition signal SR, the potential of the control end of M2 is the same as the potential of the inhibition signal SR, so that the second switch tube M2 cannot conduct, and the first switch tube M1 cannot conduct, so that the output end of the first signal conversion module 20 cannot output a signal.

[0087] Optionally, the first switch tube M1 can be a MOS tube or a triode, which is not limited here and can be determined according to specific conditions, and all are within the protection scope of the present application.

[0088] Optionally, the second switch tube M2 can be a triode or a MOS tube, which is not limited here and can be determined according to specific conditions, and all are within the protection scope of the present application.

[0089] For example, as shown in FIG. 2, the first signal conversion module 20 can be a signal conversion module 20a. Figure 1As shown, the first switch tube M1 is a PMOS tube, and the second switch tube M2 is an NPM triode. Specifically, the source of the first switch tube M1 is connected to the connection point of the first resistor R1 and the second resistor R2, the drain of the first switch tube M1 is the output end of the first signal conversion module 20, the gate of the first switch tube M1 is connected to the connection point of the second resistor R2 and the third resistor R3, the collector of the second switch tube M2 is connected to the third resistor R3, the emitter of the second switch tube M2 is grounded, and the base of the second switch tube M2 is connected to the fourth resistor R4.

[0090] The above is only one specific embodiment of the first signal conversion module 20. In actual application, the above is not limited, and the specific embodiments are not limited here. The specific embodiments can be determined according to the specific circumstances, and are all within the protection scope of the present application.

[0091] Another embodiment of the present application provides another specific embodiment of the first signal conversion module 20, and the specific structure is as shown in Figure 2 The embodiment further includes the first anti-reverse branch 21 on the basis of the above embodiment.

[0092] The cathode of the first anti-reverse branch 21 is connected to the connection point of the first resistor R1 and the second resistor R2, and the anode of the first anti-reverse branch 21 is grounded GND.

[0093] In a specific example, as shown in Figure 2 The first anti-reverse branch 21 includes the first diode D1, the anode of the first diode D1 is connected to GND, and the cathode of the first diode D1 is connected to the connection point of the first resistor R1 and the second resistor R2.

[0094] The above example only shows one specific embodiment of the first anti-reverse branch 21. In actual application, the above is not limited, and the specific embodiments are not limited here. The specific embodiments can be determined according to the specific circumstances, and are all within the protection scope of the present application.

[0095] In the embodiment, when the potential of the connection point of the first resistor R1 and the second resistor R2 is too high, that is, the potential of the connection point of the first resistor R1 and the second resistor R2 is greater than the reverse breakdown voltage of the first anti-reverse branch 21, the first diode D1 is broken down, thereby reducing the possibility of damage of the first switch tube M1 and the second switch tube M2, and improving the safety of the first signal conversion module 20.

[0096] Another embodiment of the present application provides a driving circuit, and the specific structure is as shown in Figure 1 or Figure 2 Specifically, the driving circuit includes the control module 30 and the latch holding circuit 1000 provided in any of the above embodiments.

[0097] It should be noted that the connection between the latch holding circuit 1000 and the control module 30 has been described in detail above, and will not be repeated here.

[0098] In this embodiment, since the drive circuit includes the latch-and-hold circuit 1000 provided in any of the above embodiments, the drive circuit can improve the control reliability of the first load 01, thereby improving the control reliability of the vehicle body electrical system.

[0099] Another embodiment of this application provides another implementation of the driving circuit, the specific structure of which can be found in [reference needed]. Figure 3 ( Figure 3 Only Figure 2 (This is based on the above implementation). This implementation also includes: an SBC chip 40, a second driving module 50, and a second signal conversion module 60.

[0100] The input terminal of the SBC chip 40 is connected to the second output terminal of the control module 30 to receive the heartbeat signal SP. The output terminal of the SBC chip 40 is connected to the input terminal of the second signal conversion module 60.

[0101] It should be noted that if the control module 30 is functioning correctly, it sends a heartbeat signal SP to the SBC chip 40 via its second output terminal; that is, the input terminal of the SBC chip 40 can receive the heartbeat signal SP. If the control module 30 malfunctions, such as due to an error in the software program it is running, it will no longer send the heartbeat signal SP to the SBC chip 40; that is, the input terminal of the SBC chip 40 cannot receive the heartbeat signal SP.

[0102] The output terminal of the second signal conversion module 60 is connected to the input terminal of the second drive module 50.

[0103] The input terminal of the second drive module 50 is connected to the third output terminal of the control module 30, and receives the third enable signal EN3.

[0104] It should be noted that if the control module 30 is functioning correctly, it will send the third enable signal EN3 to the second drive module 50, meaning the input of the second drive module 50 will receive the third enable signal EN3. However, if the control module 30 malfunctions, such as due to a software program error, it will not send the third enable signal EN3 to the second drive module 50, meaning the input of the second drive module 50 will not receive the third enable signal EN3.

[0105] The output end of the second driving module 50 is connected with the second load 02. The second driving module 50 sends the second driving signal QU2 in the case that the third enabling signal EN3 is received by itself. The second driving module 50 does not send the second driving signal QU2 in the case that the third enabling signal EN3 is not received by itself. Wherein, the second driving signal QU2 is a signal for driving the second load 02.

[0106] Since the second driving signal QU2 is a signal for driving the second load 02, the second driving module 50 drives the second load 02 by sending the second driving signal QU2 to the second load 02.

[0107] The SBC chip 40 sends the pilot signal Y in the case that the heartbeat signal SP is not received by itself. The SBC chip 40 does not send the pilot signal Y in the case that the heartbeat signal SP is received by itself.

[0108] The second signal conversion module 60 sends the third enabling signal EN3 in the case that the pilot signal Y is received by itself. The second signal conversion module 60 does not send the third enabling signal EN3 in the case that the pilot signal Y is not received by itself.

[0109] Since the SBC chip 40 can receive the heartbeat signal SP when the control module 30 does not fail, the SBC chip 40 does not send the pilot signal Y to the second signal conversion module 60 at this time, so that the second signal conversion module 60 does not send the third enabling signal EN3, and further the second driving module 50 cannot receive the third enabling signal EN3 from the second signal conversion module 60. In addition, since the control module 30 can send the third enabling signal EN3 to the second driving module 50 when the control module 30 does not fail, the second driving module 50 can receive the third enabling signal EN3 from the control module 30 at this time. In summary, when the control module 30 does not fail, the second driving module 50 can receive the third enabling signal EN3, so that the second driving module 50 can drive the second load 02.

[0110] When the control module 30 fails, the control module 30 does not send the heartbeat signal SP, and at this time, the SBC chip 40 sends the conductive signal Y to the second signal conversion module 60, so that the second signal conversion module 60 sends the third enable signal EN3 to the second drive module 50 at this time, and the second drive module 50 can receive the third enable signal EN3 from the second signal conversion module 60 at this time. In addition, when the control module 30 fails, the control module 30 does not send the third enable signal EN3, so the second drive module 50 cannot receive the third enable signal EN3 from the control module 30. In summary, when the control module 30 fails, the second drive module 50 can receive the third enable signal EN3, so the second drive module 50 can drive the second load 02.

[0111] In summary, the embodiment can drive the second load 02 when the control module 30 fails or does not fail, so the reliability of the control of the second load 02 is improved. Since the vehicle body electrical appliances can be used as the second load 02, the embodiment can also improve the control reliability of the vehicle body electrical appliances.

[0112] Another embodiment of the present application provides a specific implementation of the second signal conversion module 60, and the specific structure can be referred to Figure 3 The embodiment specifically includes a third switch tube M3, a fifth resistor R5, and a sixth resistor R6. The connection relationship between the devices is specifically as follows:

[0113] One end of the third switch tube M3 is connected with the output end of the second power supply VCC2. The other end of the third switch tube M3 is connected with one end of the fifth resistor R5 and one end of the sixth resistor R6, respectively. The other end of the fifth resistor R5 is connected with GND.

[0114] The other end of the sixth resistor R6 is used as the output end of the second signal conversion module 60.

[0115] The control end of the third switch tube M3 is used as the input end of the second signal conversion module 60, and the third switch tube M3 is a switch tube that is turned on when the conductive signal Y is received at the control end.

[0116] Since the third switch tube M3 is a switch tube that is turned on when the conductive signal Y is received at the control end, the third switch tube M3 is turned on when the conductive signal Y is received.

[0117] When the third switch M3 is turned on, one end of the fifth resistor R5 is connected to the output terminal of the second power supply VCC2 and the other end is grounded, that is, current flows through the fifth resistor R5. Therefore, the potential of the output terminal of the second signal conversion module 60 is equal to the potential of the connection point of the fifth resistor R5 and the sixth resistor R6, which is equal to the output voltage of the second power supply VCC2. That is, the output terminal of the second signal conversion module 60 outputs the third enable signal EN3.

[0118] Optionally, the third switching transistor M3 can be a transistor or a MOSFET. No specific limitation is made here, and it can be determined according to the specific situation. Both are within the protection scope of this application.

[0119] For example, such as Figure 3 As shown, the third switch M3 is a PNP transistor. The emitter of the third switch M3 is connected to the output terminal of the second power supply VCC2, the collector of the third switch M3 is connected to the junction of the fifth resistor R5 and the sixth resistor R6, and the base of the third switch M3 serves as the input terminal of the second signal conversion module 60.

[0120] The above is only one specific implementation of the second signal conversion module 60. In practical applications, it includes, but is not limited to, this one. It can be determined according to the specific situation and is within the protection scope of this application.

[0121] Another embodiment of this application provides yet another implementation of the driving circuit, the specific structure of which can be found in [reference needed]. Figure 4 ( Figure 4 Only Figure 3 This implementation method, based on the above implementation method, also includes: a third anti-reverse branch 70 and a fourth anti-reverse branch 80. The connection relationships between the various devices are as follows:

[0122] The anode of the third anti-reverse branch 70 is connected to the output terminal of the second signal conversion module 60, and the cathode of the third anti-reverse branch 70 is connected to the input terminal of the second drive module 50.

[0123] The anode of the fourth anti-reverse branch 80 is connected to the third output terminal of the control module 30, and the cathode of the fourth anti-reverse branch 80 is connected to the input terminal of the second drive module 50.

[0124] In a specific example, such as Figure 4 As shown, the third anti-reverse branch 70 includes: a third diode D3, the anode of the third diode D3 is connected to the output terminal of the second signal conversion module 60, and the cathode of the third diode D3 is connected to the input terminal of the second drive module 50.

[0125] The above example only shows one specific implementation of the third diode D3. In actual applications, including but not limited to the above, no specific limitation is made here, and all are within the protection scope of the present application.

[0126] In one specific example, as shown in Figure 4 The fourth anti-reverse branch 80 includes a fourth diode D4, an anode of the fourth diode D4 is connected to the third output end of the control module 30, and a cathode of the fourth diode D4 is connected to the input end of the second driving module 50.

[0127] The above example only shows one specific implementation of the fourth diode D4. In actual applications, including but not limited to the above, no specific limitation is made here, and all are within the protection scope of the present application.

[0128] In the present embodiment, since the third anti-reverse branch 70 and the fourth anti-reverse branch 80 are added, if the third enable signal EN3 from the control module 30 can be output to the second driving module 50 through the fourth anti-reverse branch 80, the third enable signal EN3 from the second signal conversion module 60 cannot be output to the second driving module 50 through the third anti-reverse branch 70, and vice versa. If the third enable signal EN3 from the second signal conversion module 60 is output to the second driving module 50 through the third anti-reverse branch 70, the third enable signal EN3 from the control module 30 cannot be output to the second driving module 50 through the fourth anti-reverse branch 80. Therefore, the possibility of backflow is reduced, and the safety of the driving circuit is improved.

[0129] Another embodiment of the present application provides another implementation of a driving circuit, and the specific structure can be referred to Figure 5 Figure 5 only on the basis of Figure 4 ). This implementation is based on the above-mentioned implementation and further includes a third driving module 100 and a third signal conversion module 110. The connection relationship between the devices is described as follows.

[0130] The output end of the SBC chip 40 is further connected to the first input end of the third signal conversion module 110.

[0131] The second input end of the third signal conversion module 110 receives a target signal MU.

[0132] Optionally, the target signal MU is a signal representing that a brake pedal in a vehicle where the driving circuit is located is stepped on. In actual applications, including but not limited to the above, no specific limitation is made here, and all are within the protection scope of the present application.

[0133] The output end of the third signal conversion module 110 is connected to the input end of the third driving module 100.​

[0134] The input end of the third driving module 100 is connected with the fourth output end of the control module 30, and receives the fourth enable signal EN4.

[0135] It should be noted that if the control module 30 does not fail, the control module 30 can send the fourth enable signal EN4 to the third driving module 100, that is, the input end of the third driving module 100 can receive the fourth enable signal EN4. If the control module 30 fails, for example, the software program running in the control module 30 is wrong, the control module 30 cannot send the fourth enable signal EN4 to the third driving module 100, that is, the input end of the third driving module 100 cannot receive the fourth enable signal EN4.

[0136] The output end of the third driving module 100 is connected with the third load 03, and the third driving module 100 sends the third driving signal QU3 in the case that the third driving module 100 itself receives the fourth enable signal EN4. The third driving signal QU3 is a signal for driving the third load 03.

[0137] Since the third driving signal QU3 is a signal for driving the third load 03, the third driving module 100 drives the third load 03 by sending the third driving signal QU3 to the third load 03.

[0138] The third signal conversion module 110 sends the fourth enable signal EN4 in the case that the third signal conversion module 110 itself receives the guide communication signal Y and the target signal MU. The third signal conversion module 110 does not send the fourth enable signal EN4 in the case that the third signal conversion module 110 itself does not receive the guide communication signal Y and / or the target signal MU.

[0139] Since the SBC chip 40 can receive the heartbeat signal SP when the control module 30 does not fail, the SBC chip 40 does not send the guide communication signal Y to the third signal conversion module 110 at this time, so that the third signal conversion module 110 does not send the fourth enable signal EN4, and further the third driving module 100 cannot receive the fourth enable signal EN4 from the third signal conversion module 110. In addition, since the control module 30 can send the fourth enable signal EN4 to the third driving module 100 when the control module 30 does not fail, the third driving module 100 can receive the fourth enable signal EN4 from the control module 30 at this time. In summary, when the control module 30 does not fail, the third driving module 100 can receive the fourth enable signal EN4, so that the third driving module 100 can drive the third load 03.

[0140] When the control module 30 fails to send the heartbeat signal SP, the SBC chip 40 sends the guide signal Y to the third signal conversion module 110, and if the third signal conversion module 110 can receive the target signal MU, the third signal conversion module 110 sends the fourth enable signal EN4 to the third driving module 100, and the third driving module 100 can receive the fourth enable signal EN4 from the third signal conversion module 110. In addition, when the control module 30 fails to send the fourth enable signal EN4, the third driving module 100 cannot receive the fourth enable signal EN4 from the control module 30. In summary, when the control module 30 fails and the third signal conversion module 110 can receive the target signal MU, the third driving module 100 can receive the fourth enable signal EN4, and thus the third driving module 100 can drive the third load 03.

[0141] In the embodiment, as known from the above, whether the driving circuit can drive the third load 03 when the control module 30 fails depends on whether the driving circuit receives the target signal MU, and thus the embodiment has more functions, so that the driving circuit can be applied to more scenarios.

[0142] Another embodiment of the present application provides a specific implementation of the third signal conversion module 110, and the specific structure can be seen from Figure 5 The implementation specifically includes a fourth switch tube M4, a fifth switch tube M5, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The connection relationship between the devices is specifically as follows:

[0143] One end of the seventh resistor R7 is the second input end of the third signal conversion module 110, and one end of the eighth resistor R8 is connected to the output end of the third power supply VCC3.

[0144] The other end of the seventh resistor R7 is connected to the other end of the eighth resistor R8, and the connection point is connected to the control end of the fourth switch tube M4. One end of the fourth switch tube M4 is connected to the output end of the third power supply VCC3. The other end of the fourth switch tube M4 is connected to one end of the fifth switch tube M5.

[0145] The other end of the fifth switch tube M5 is connected to one end of the ninth resistor R9, and the connection point is connected to one end of the tenth resistor R10. The other end of the ninth resistor R9 is connected to GND, and the other end of the tenth resistor R10 is the output end of the third signal conversion module 110.

[0146] The eighth resistor R8 is a resistor that can itself divide voltage to turn on the fourth switch tube M4.

[0147] The control terminal of the fifth switch M5 serves as the first input terminal of the third signal conversion module 110. The third switch is a switch that turns on when it receives a conduction signal Y.

[0148] Since the fifth switch M5 is a switch that turns on when it receives the turn-on signal Y, the fifth switch M5 turns on when it receives the turn-on signal Y.

[0149] The seventh resistor R7 and the eighth resistor R8 are connected in series. One end of the series branch is connected to the output terminal of the third power supply VCC3, and the other end receives the target signal MU. That is, the seventh resistor R7 and the eighth resistor R8 divide the voltage. Since the eighth resistor R8 is a resistor that can turn on the fourth switch M4 by dividing its own voltage, the fourth switch M4 is turned on.

[0150] It should be noted that, since the seventh resistor R7 and the eighth resistor R8 divide the voltage, as long as the resistance values ​​of the seventh resistor R7 and the eighth resistor R8 are set properly, the voltage division of the eighth resistor R8 can turn on the fourth switch M4.

[0151] With the fourth switch M4 and the fifth switch M5 turned on, one end of the ninth resistor R9 is connected to the output of the third power supply VCC3 and the other end is grounded, meaning that current flows through the ninth resistor R9. Therefore, the output potential of the third signal conversion module 110 is equal to the potential of the connection point between the ninth resistor R9 and the tenth resistor R10, which is equal to the output voltage of the third power supply VCC3. In other words, the output of the third signal conversion module 110 outputs the fourth enable signal EN4.

[0152] Optionally, the fourth switching transistor M4 can be a transistor or a MOSFET. No specific limitation is made here, and it can be determined according to the specific situation. All of them are within the protection scope of this application.

[0153] Optionally, the fifth switching transistor M5 can be a transistor or a MOSFET. No specific limitation is made here, and it can be determined according to the specific situation. Both are within the protection scope of this application.

[0154] For example, such as Figure 5 As shown, the fourth switch M4 is a PMOS transistor, and the fifth switch M5 is a PNP transistor. The source of the fourth switch M4 is connected to the output of the third power supply VCC3, the drain of the fourth switch M4 is connected to the emitter of the fifth switch M5, the collector of the fifth switch M5 is connected to the junction of the ninth resistor R9 and the tenth resistor R10, the gate of the fourth switch M4 is connected to the seventh resistor R7, and the base of the fifth switch M5 serves as the first input terminal of the third signal conversion module 110.

[0155] The above is only one specific embodiment of the third signal conversion module 110, and in actual applications, the third signal conversion module 110 can include but is not limited to the above, and the specific embodiments are not limited herein, and can be determined according to actual conditions, and are within the protection scope of the present application.

[0156] Another embodiment of the present application provides another embodiment of the driving circuit, and the specific structure can be referred to Figure 6 Figure 6 only on the basis of Figure 5 ). This embodiment further includes a fifth anti-reverse branch 120 and a sixth anti-reverse branch 130 on the basis of the above embodiment. The connection relationship between the devices is described as follows.

[0157] The anode of the fifth anti-reverse branch 120 is connected to the fifth control end of the control module 30, and the cathode of the fifth anti-reverse branch 120 is connected to the input end of the third driving module 100.

[0158] The anode of the sixth anti-reverse branch 130 is connected to the output end of the third signal conversion module 110, and the cathode of the sixth anti-reverse branch 130 is connected to the input end of the third driving module 100.

[0159] In a specific example, as shown in Figure 6 , the fifth anti-reverse branch 120 includes a fifth diode D5, the anode of the fifth diode D5 is connected to the fifth control end of the control module 30, and the cathode of the fifth diode D5 is connected to the input end of the third driving module 100.

[0160] The above example only shows one specific embodiment of the fifth diode D5, and in actual applications, the fifth diode D5 can include but is not limited to the above, and the specific embodiments are not limited herein, and can be determined according to actual conditions, and are within the protection scope of the present application.

[0161] In a specific example, as shown in Figure 6 , the sixth anti-reverse branch 130 includes a sixth diode D6, the anode of the sixth diode D6 is connected to the output end of the third signal conversion module 110, and the cathode of the sixth diode D6 is connected to the input end of the third driving module 100.

[0162] The above example only shows one specific embodiment of the sixth diode D6, and in actual applications, the sixth diode D6 can include but is not limited to the above, and the specific embodiments are not limited herein, and can be determined according to actual conditions, and are within the protection scope of the present application.

[0163] ​In the embodiment, since the fifth anti-reverse branch 120 and the sixth anti-reverse branch 130 are added, if the fourth enable signal EN4 from the third signal conversion module 110 is output to the third driving module 100 through the sixth anti-reverse branch 130, the fourth enable signal EN4 from the control module 30 cannot be output to the third driving module 100 through the fifth anti-reverse branch 120, and vice versa, if the fourth enable signal EN4 from the control module 30 is output to the third driving module 100 through the fifth anti-reverse branch 120, the fourth enable signal EN4 from the third signal conversion module 110 cannot be output to the third driving module 100 through the sixth anti-reverse branch 130, thus reducing the possibility of backflow, thereby improving the safety of the driving circuit.

[0164] The above description of the disclosed embodiments, the features described in the embodiments of the present specification can be replaced or combined with each other, so that those skilled in the art can realize or use the present application. The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as the above preferred embodiment, it is not intended to limit the present application. Any person skilled in the art, without departing from the scope of the present application, can make many possible changes and modifications to the above disclosed methods and technical contents, or modify equivalent embodiments. Therefore, any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments, without departing from the scope of the present application, still belongs to the protection scope of the present application.

Claims

1. A latch hold circuit, characterized by, The application relates to a latch holding circuit, comprising: a first driving module and a first signal conversion module; wherein: a first input end of the first driving module is connected with a first output end of a control module in a driving circuit as an input end of the latch holding circuit, and receives a first enable signal; an output end of the first driving module is connected with a first load as an output end of the latch holding circuit; an input end of the first signal conversion module is connected with an output end of the first driving module, and an output end of the first signal conversion module is connected with a second input end of the first driving module; the first driving module sends a first driving signal under the condition that the first driving module itself receives the first enable signal or a second enable signal; the first driving signal is a signal for driving the first load; a default operation mode of the first signal conversion module is that the first signal conversion module sends the second enable signal under the condition that the first signal conversion module itself receives the first driving signal.

2. The latching retention circuit of claim 1, wherein, The first signal conversion module comprises two switch tubes and four resistors; wherein: one end of a first resistor is connected with an input end of the first signal conversion module; the other end of the first resistor is connected with one end of a second resistor, and a connection point is connected with one end of a first switch tube; the other end of the first switch tube is connected with an output end of the first signal conversion module; the other end of the second resistor is connected with a control end of the first switch tube, and a connection point is connected with one end of a second switch tube through a third resistor; the other end of the second switch tube is grounded; the control end of the second switch tube is connected with one end of a fourth resistor; the other end of the fourth resistor is connected with an output end of a first power supply; the first power supply is a power supply which can output power capable of making the second switch tube conductive; the second resistor is a resistor which can make the first switch tube conductive through voltage division under the condition that the second switch tube is conductive.

3. The latching retention circuit of claim 2, wherein, The first signal conversion module further comprises a first anti-reverse branch; wherein: a cathode of the first anti-reverse branch is connected with the connection point of the first resistor and the second resistor, and an anode of the first anti-reverse branch is grounded.

4. A drive circuit, characterized by The application relates to a latch holding circuit, comprising: a control module and the latch holding circuit according to any one of claims 1 to 3.

5. The drive circuit according to claim 4, characterized in that, The application further relates to a latch holding circuit, comprising: an SBC chip, a second driving module and a second signal conversion module; an input end of the SBC chip is connected with a second output end of the control module, and receives a heartbeat signal; an output end of the SBC chip is connected with an input end of the second signal conversion module; an output end of the second signal conversion module is connected with an input end of the second driving module; an input end of the second driving module is connected with a third output end of the control module, and receives a third enable signal; an output end of the second driving module is connected with a second load, and the second driving module sends a second driving signal under the condition that the second driving module itself receives the third enable signal; the second driving signal is a signal for driving the second load; the SBC chip sends a conductive signal under the condition that the SBC chip itself does not receive the heartbeat signal; the second signal conversion module sends the third enable signal under the condition that the second signal conversion module itself receives the conductive signal.

6. The drive circuit according to claim 5, characterized in that, The second signal conversion module comprises a third switch tube and two resistors. One end of the third switch tube is connected with the output end of the second power supply. The other end of the third switch tube is connected with one end of the fifth resistor and one end of the sixth resistor respectively. The other end of the fifth resistor is grounded. The other end of the sixth resistor serves as the output end of the second signal conversion module. The control end of the third switch tube serves as the input end of the second signal conversion module, and the third switch tube is a switch tube that is turned on when the control end thereof receives the conduction signal.

7. The drive circuit according to claim 5, characterized by Further comprising: Two anti-reverse branches; wherein: The anode of the third anti-reverse branch is connected with the output end of the second signal conversion module, and the cathode of the third anti-reverse branch is connected with the input end of the second drive module. The anode of the fourth anti-reverse branch is connected with the third output end of the control module, and the cathode of the fourth anti-reverse branch is connected with the input end of the second drive module.

8. The drive circuit according to any one of claims 5 to 7, characterized by Further comprising: A third drive module and a third signal conversion module; wherein: The output end of the SBC chip is further connected with the first input end of the third signal conversion module; The second input end of the third signal conversion module receives a target signal; The output end of the third signal conversion module is connected with the input end of the third drive module; The input end of the third drive module is connected with the fourth output end of the control module to receive a fourth enable signal; The output end of the third drive module is connected with a third load, and the third drive module sends a third drive signal when the fourth enable signal is received thereby; the third drive signal is a signal for driving the third load; The third signal conversion module sends the fourth enable signal when the conduction signal and the target signal are received thereby.

9. The drive circuit according to claim 8, characterized in that, The third signal conversion module comprises two switch tubes and four resistors; wherein: One end of the seventh resistor serves as the second input end of the third signal conversion module, and one end of the eighth resistor is connected with the output end of the third power supply; The other end of the seventh resistor is connected with the other end of the eighth resistor, and the connection point is connected with the control end of the fourth switch tube; One end of the fourth switch tube is connected with the output end of the third power supply; The other end of the fourth switch tube is connected with one end of the fifth switch tube; The other end of the fifth switch tube is connected with one end of the ninth resistor, and the connection point is connected with one end of the tenth resistor; The other end of the ninth resistor is grounded, and the other end of the tenth resistor serves as the output end of the third signal conversion module; The eighth resistor is a resistor that can make the fourth switch tube turned on through voltage division; The control end of the fifth switch tube serves as the first input end of the third signal conversion module, and the fifth switch tube is a switch tube that is turned on when the control end thereof receives the conduction signal.

10. The drive circuit of claim 8, wherein Further comprising: Two anti-reverse branches; wherein: The anode of the fifth anti-reverse branch is connected with the fifth control end of the control module, and the cathode of the fifth anti-reverse branch is connected with the input end of the third drive module. The anode of the sixth anti-inversion branch is connected with the output end of the third signal conversion module, and the cathode of the sixth anti-inversion branch is connected with the input end of the third driving module.

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