Diagnostic protection circuit

Abstract

The utility model relates to the technical field of power supplies, and discloses a diagnosis protection circuit, which comprises a diagnosis system respectively connected with a power supply end and a power supply output end; the control system is connected with the diagnosis system; the driving system is respectively connected with the control system, the power supply end and the power supply output end; the over-current self-protection system is respectively connected with the power supply end, the driving system and the control system and is used for outputting an over-current control signal to the driving system when over-current is detected, and the priority of the over-current control signal is higher than that of the driving signal; the short ground protection system and the short ground protection system are respectively connected with the driving system and the control system and are used for outputting a short ground control signal to the driving system when the short ground is detected, and the priority of the short ground control signal is higher than that of the driving signal. The problem that in the prior art, the reliability of high-side driving is low due to the fact that no fault self-diagnosis and protection functions exist is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field, concretely relates to diagnostic protection circuit. BACKGROUND

[0002] High side drive refers to the enablement of the driving device by closing the switch in front of the electric appliance or driving device through the power line, that is, the high side drive is a controllable switch added in the power supply end.

[0003] In the prior art, the high side drive control circuit uses a triode to build or uses a multi-channel integrated bridge drive instead, and can also use an integrated chip or MOS tube, but the scheme of using a triode to build or using a multi-channel integrated bridge drive instead can only pass small current and cannot pass large current, and the scheme of using an integrated chip or MOS tube that can pass large current does not have the functions of self-diagnosing faults and protection, resulting in low reliability of the high side drive. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a diagnostic protection circuit to solve the problem of low reliability of the high side drive caused by the lack of functions of self-diagnosing faults and protection in the prior art.

[0005] In the first aspect, the utility model provides a diagnostic protection circuit, and the circuit comprises:

[0006] A diagnostic system is connected with the power supply end and the power supply output end respectively and is used for collecting and outputting output voltage after adjustment;

[0007] A control system is connected with the diagnostic system and is used for receiving the output voltage after adjustment, detecting the output voltage after adjustment to obtain a detection result, and outputting a driving signal according to the detection result, wherein the detection result comprises a short power supply, an open circuit and a short ground;

[0008] A driving system is connected with the control system, the power supply end and the power supply output end respectively and is used for receiving the driving signal and controlling the voltage transmission of the power supply end to the power supply output end based on the driving signal;

[0009] An overcurrent self-protection system is connected with the power supply end, the driving system and the control system respectively and is used for outputting an overcurrent control signal to the driving system when overcurrent is detected, wherein the priority of the overcurrent control signal is higher than that of the driving signal;

[0010] A short ground protection system is connected with the driving system and the control system respectively and is used for outputting a short ground control signal to the driving system when short ground is detected, wherein the priority of the short ground control signal is higher than that of the driving signal.

[0011] Before the HSD (High Side Driver) runs, the output voltage is sent to the control system through the diagnosis system for adjustment, the control system detects the adjusted voltage to obtain a detection result, and a driving signal is sent to the driving system based on the detection result, such as short power supply, short ground, and open circuit. When an overcurrent fault occurs during the running of the HSD, the overcurrent self-protection system is used to shut down the driving system to achieve the effect of overcurrent protection. Even if the control system mistakenly triggers the driving signal when the overcurrent occurs, the driving system will not be turned on. In the case of a short ground, the driving system is first shut down by the overcurrent self-protection system to achieve the protection effect, and then the driving system is shut down by the short ground protection system to achieve the effect of driving state locking. Even if the control system mistakenly triggers the driving signal when the short ground occurs, the driving system will not be turned on. Therefore, the high-side driving combined with self-diagnosis and protection of faults is realized, and the reliability and robustness are greatly improved.

[0012] In an alternative embodiment, the overcurrent self-protection system comprises:

[0013] An overcurrent detection module, connected to the driving system, for detecting a current signal of the driving system and outputting;

[0014] An overcurrent control module, connected to the overcurrent detection module and the driving system, for receiving the current signal and outputting an overcurrent control signal to the driving system when overcurrent is detected based on the current signal.

[0015] In an alternative embodiment, the overcurrent detection module comprises:

[0016] A first resistor, the first end of which is connected to the power supply end, and the second end of which is connected to the driving system and the overcurrent control module;

[0017] The overcurrent control module comprises:

[0018] A first triode, the first end of which is connected to the first end of the first resistor, and the second end of which is connected to the driving system;

[0019] A second resistor, the first end of which is connected to the second end of the first resistor, and the second end of which is connected to the control end of the first triode.

[0020] In an alternative embodiment, the short ground protection system comprises:

[0021] A short ground detection module, connected to the output end, for outputting a short ground signal when a short ground is detected;

[0022] The short ground control module is connected with the short ground detection module and the driving system respectively, and is configured to receive the short ground signal and output a short ground control signal to the driving system when the short ground is detected based on the short ground signal.

[0023] In an alternative embodiment, the short ground detection module comprises:

[0024] The first diode has a first end connected with the output end and a second end connected with the short ground control module.

[0025] The short ground control module comprises:

[0026] The first capacitor has a first end connected with the second end of the first resistor.

[0027] The third resistor has a first end connected with the second end of the first diode and the second end of the first capacitor respectively.

[0028] The second triode has a control end connected with the second end of the third resistor, a first end connected with the second end of the first resistor, and a second end connected with the driving system.

[0029] The fourth resistor has a first end connected with the control end of the second triode and a first end connected with the first end of the second triode.

[0030] The transient suppression diode has a first end connected with the second end of the first resistor and a second end connected with the second end of the second triode.

[0031] The fifth resistor has a first end connected with the first end of the third resistor.

[0032] The sixth resistor has a first end connected with the second end of the second triode and the driving system respectively, and a second end connected with the second end of the fifth resistor.

[0033] In an alternative embodiment, the diagnostic system comprises:

[0034] The voltage dividing module is connected with the reference voltage end of the control system and the input end of the control system respectively.

[0035] When the control system outputs the reference voltage, the control system detects the open circuit, the short ground, and the short power supply based on the voltage interval where the adjusted output voltage is located.

[0036] When the control system does not output the reference voltage, the control system detects the short power supply based on the voltage interval where the adjusted output voltage is located.

[0037] In an alternative embodiment, the voltage dividing module comprises:

[0038] a second diode, a first end of the second diode being connected with the reference voltage end;

[0039] a seventh resistor, a first end of the seventh resistor being connected with a second end of the second diode, and a second end of the seventh resistor being connected with the output end;

[0040] an eighth resistor, a first end of the eighth resistor being connected with the second end of the seventh resistor, and a second end of the eighth resistor being connected with the input end of the control system;

[0041] a ninth resistor, a first end of the ninth resistor being connected with the second end of the eighth resistor, and a second end of the ninth resistor being grounded;

[0042] a second capacitor, a first end of the second capacitor being connected with the second end of the eighth resistor, and a second end of the second capacitor being grounded.

[0043] In an optional implementation, the control system comprises:

[0044] a controller, the controller being connected with the diagnostic system, and being configured to receive the adjusted output voltage sent by the diagnostic system, and output a control signal based on a voltage range of the adjusted output voltage;

[0045] a switch module, the switch module being connected with the controller and the driving system respectively, and being configured to send a driving signal to the driving system based on the control signal.

[0046] In an optional implementation, the switch module comprises:

[0047] a tenth resistor, a first end of the tenth resistor being connected with the controller;

[0048] a third triode, a control end of the third triode being connected with a second end of the tenth resistor, and a first end of the third triode being grounded;

[0049] an eleventh resistor, a first end of the eleventh resistor being connected with the control end of the third triode, and a second end of the eleventh resistor being grounded;

[0050] a twelfth resistor, a first end of the twelfth resistor being connected with a second end of the third triode, and a second end of the twelfth resistor being connected with the second end of the sixth resistor.

[0051] In an optional implementation, the driving system comprises:

[0052] a third diode, a first end of the third diode being connected with the power supply end, and a second end of the third diode being connected with the first end of the first resistor;

[0053] The full-control device is connected with the first end of the sixth resistor through the control end, the first end of the full-control device is connected with the second end of the first resistor, and the second end of the full-control device is connected with the output end. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0055] Figure 1 It is a diagnostic protection circuit structure diagram according to the embodiment of the present application.

[0056] Figure 2 It is an overcurrent self-protection system structure diagram in the diagnostic protection circuit according to the embodiment of the present application.

[0057] Figure 3 It is a detailed structure diagram of the overcurrent self-protection system in the diagnostic protection circuit according to the embodiment of the present application.

[0058] Figure 4 It is a short ground protection system structure diagram in the diagnostic protection circuit according to the embodiment of the present application.

[0059] Figure 5 It is a detailed structure diagram of the short ground protection system in the diagnostic protection circuit according to the embodiment of the present application.

[0060] Figure 6 It is a diagnostic system structure diagram in the diagnostic protection circuit according to the embodiment of the present application.

[0061] Figure 7 It is a detailed structure diagram of the diagnostic system in the diagnostic protection circuit according to the embodiment of the present application.

[0062] Figure 8 It is a control system structure diagram in the diagnostic protection circuit according to the embodiment of the present application.

[0063] Figure 9 It is a detailed structure diagram of the control system in the diagnostic protection circuit according to the embodiment of the present application.

[0064] Figure 10 It is a drive system structure diagram in the diagnostic protection circuit according to the embodiment of the present application. DETAILED DESCRIPTION

[0065] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0066] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements, it can be wireless connection, or it can be wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0069] In the present embodiment, a diagnostic protection circuit is provided, as shown in the figure, the circuit comprises: Figure 1

[0070] The diagnostic system 10 is connected with the power supply end POWER and the power supply output end OUTPUT respectively, for collecting and outputting the output voltage after voltage regulation.

[0071] Specifically, the diagnostic system 10 outputs the voltage of the output end after voltage regulation to the control system 20, so that the voltage of the output end after regulation is within the preset interval range, and the fault condition is determined based on the preset interval range of the output end voltage after regulation. Optionally, the diagnostic system 10 is built-in voltage regulating device, or can be a voltage reducing unit.

[0072] ​The control system 20 is connected with the diagnostic system 10, and is configured to receive the adjusted output voltage, detect a detection result based on the adjusted output voltage, and output a driving signal based on the detection result, wherein the detection result comprises a short power supply, an open circuit, and a short ground.

[0073] Specifically, after receiving the adjusted output voltage, the control system 20 detects an analog range of the adjusted output voltage, determines a driving fault of the short power supply, the open circuit, or the short ground based on the analog range, and outputs the driving signal based on the driving fault. When the driving fault is detected, the control system 20 outputs a stop driving signal. Optionally, the control system 20 can be a device with a control function or a control chip.

[0074] The driving system 30 is connected with the control system 20, the power supply end, and the power supply output end, and is configured to receive the driving signal, and control the voltage of the power supply end to be transmitted to the power supply output end based on the driving signal.

[0075] Specifically, when receiving the driving signal, the driving system 30 transmits the voltage of the power supply end to the power supply output end, and when receiving the stop driving signal, the driving system 30 stops transmitting the voltage of the power supply end to the power supply output end. Optionally, the driving system 30 can be a switch built with a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube.

[0076] The overcurrent self-protection system 40 is connected with the power supply end, the driving system 30, and the control system 20, and is configured to output an overcurrent control signal to the driving system 30 when overcurrent is detected, wherein the overcurrent control signal has a higher priority than the driving signal.

[0077] Specifically, when overcurrent is detected, the overcurrent self-protection system 40 outputs the overcurrent control signal to the driving system 30, so as to temporarily lock the driving system 30. When the current is in a normal range, the overcurrent self-protection system 40 outputs a normal signal to the driving system 30, so as to release the state of locking the driving system 30. Optionally, the overcurrent self-protection system 40 can be a self-detection control switch.

[0078] The short ground protection system 50 is connected with the driving system 30 and the control system 20, and is configured to output a short ground control signal to the driving system 30 when short ground is detected, wherein the short ground control signal has a higher priority than the driving signal.

[0079] In particular, when the short ground is detected, the short ground protection system 50 outputs a short ground control signal to the driving system 30, so as to lock the driving system 30. Compared with the overcurrent self-protection system 40, the short ground protection system 50 locks the driving system 30 not temporarily, at this time, the control system 20 outputs a short ground fault signal based on the short ground fault detected by the diagnosis system 10, and optionally, the short ground protection system 50 can also be a self-detection control switch.

[0080] The diagnosis system 10 collects the output voltage and outputs to the control system 20, the control system 20 receives the adjusted ground output voltage, detects the analog range of the output voltage, judges the driving fault of the short power supply, open circuit or short ground based on the analog range, and outputs the driving signal based on the driving fault. At the same time, the overcurrent self-protection system 40 detects that the current of the driving is higher than the preset value, and outputs an overcurrent control signal to the driving system, so as to shut down the driving system 30 to protect the power supply and the load, and the short ground protection system 50 detects the short ground, and outputs a short ground control signal to the driving system, so as to shut down the driving system 30 to protect the power supply and the load.

[0081] The diagnosis protection circuit provided by the embodiment can be used for the following purposes. Before the HSD runs, the diagnosis system 10 sends the output voltage after adjustment to the control system, the control system 20 detects the adjusted voltage to obtain a detection result, and sends a driving signal to the driving system 30 based on the detection result such as short power supply, short ground and open circuit. When the overcurrent fault occurs during the running of the HSD, the overcurrent self-protection system 40 shuts down the driving system 30 to achieve the effect of overcurrent protection. Even if the control system 20 misfires the driving signal when the overcurrent occurs, the driving system 30 will not be started. When the short ground occurs, the overcurrent self-protection system 40 shuts down the driving system 30 first to achieve the effect of protection, and then the short ground protection system 50 shuts down the driving system 30 to achieve the effect of driving state locking. Even if the control system 20 misfires the driving signal when the short ground occurs, the driving system 30 will not be started. Therefore, the high side driving combined with the self-diagnosis and protection of the fault is realized, and the reliability and robustness are greatly improved.

[0082] In some optional embodiments, as shown in Figure 2 The overcurrent self-protection system 40 includes:

[0083] The overcurrent detection module 41 is connected with the driving system 30, and is used for detecting the current signal of the driving system 30 and outputting.

[0084] In particular, the overcurrent detection module 41 provides the current signal to the overcurrent control module 42. Optionally, the overcurrent detection module 41 can be a load, and the load provides the current signal to the overcurrent control module 42 after being turned on.

[0085] The overcurrent control module 42 is connected with the overcurrent detection module 41 and the driving system 30 respectively, and is configured to receive the current signal and output an overcurrent control signal to the driving system 30 when overcurrent is detected based on the current signal.

[0086] Specifically, when the overcurrent control module 42 outputs the overcurrent control signal to the driving system 30, if the control system 20 sends the driving signal, the driving system 30 receives the overcurrent control signal and the driving signal at the same time, and the driving system 30 stops transmitting the voltage of the power supply end POWER to the power supply output end OUTPUT due to the overcurrent control signal having a higher priority than the driving signal.

[0087] By providing the overcurrent detection module 41 with the current signal, the overcurrent control module 42 outputs the off overcurrent control signal to the driving system 30 when detecting that the current signal is greater than the preset current threshold, so that the driving system 30 is closed to stop transmitting the voltage of the power supply end POWER to the power supply output end OUTPUT, thereby achieving the overcurrent protection effect.

[0088] In some optional embodiments, as shown in Figure 3 The overcurrent detection module 41 comprises:

[0089] The first resistor R1 has a first end connected with the power supply end POWER and a second end connected with the driving system 30 and the overcurrent control module 42.

[0090] Optionally, the overcurrent detection module 41 can be a capacitive load or an inductive load in addition to the first resistor R1.

[0091] The overcurrent control module 42 comprises:

[0092] The first triode Q1 has a first end connected with the first end of the first resistor R1 and a second end connected with the driving system 30.

[0093] The second resistor R2 has a first end connected with the second end of the first resistor R1 and a second end connected with the control end of the first triode Q1.

[0094] Specifically, the first triode Q1 can also be a switching device, so that the driving system 30 is maintained in the off state. Optionally, the first triode Q1 is turned on when overcurrent occurs to provide the bus voltage to the driving system 30.

[0095] In the embodiment, the first resistor R1 and the second resistor R2 are current limiting resistors, and the first transistor Q1 is in an off state when the power supply output terminal OUTPUT is normal. When an overcurrent fault occurs at the power supply output terminal OUTPUT, a voltage greater than the turn-on voltage of the first transistor Q1 is generated across the first resistor R1, and the first transistor Q1 is turned on to provide a bus voltage to the driving system 30, that is, the voltage of the power supply terminal POWER is directly provided to the driving system 30 to send an overcurrent control signal to the driving system 30. After receiving the overcurrent control signal, the driving system 30 stops transmitting the voltage of the power supply terminal POWER to the power supply output terminal OUTPUT, thereby achieving the effect of overcurrent protection.

[0096] In some optional embodiments, as shown in Figure 4 The short ground protection system 50 includes:

[0097] A short ground detection module 51 connected to the power supply output terminal OUTPUT, configured to output a short ground signal when a short ground is detected.

[0098] A short ground control module 52 connected to the short ground detection module 51 and the driving system 30, configured to receive the short ground signal and output a short ground control signal to the driving system 30 when a short ground is detected based on the short ground signal.

[0099] By providing the short ground signal to the short ground control module 52 through the short ground detection module 51, the short ground control module 52 outputs a short ground control signal to turn off the driving system 30 when the short ground signal is received, so that the driving system 30 is turned off to stop transmitting the voltage of the power supply terminal POWER to the power supply output terminal OUTPUT, thereby achieving the effect of short ground protection.

[0100] In some optional embodiments, as shown in Figure 5 The short ground detection module 51 includes:

[0101] A first diode D1 having a first end connected to the power supply output terminal OUTPUT and a second end connected to the short ground control module 52.

[0102] Specifically, the first diode D1 provides a bus voltage to the second transistor Q2 to provide an off signal, and the first diode D1 does not conduct when a short ground occurs, thereby providing a conduction signal to the second transistor Q2.

[0103] The short ground control module 52 includes:

[0104] A first capacitor C1 having a first end connected to the second end of the first resistor R1.

[0105] The first end of the third resistor R3 is connected with the second end of the first diode D1 and the second end of the first capacitor C1 respectively;

[0106] The control end of the second triode Q2 is connected with the second end of the third resistor R3, the first end of the second triode Q2 is connected with the second end of the first resistor R1, and the second end of the second triode Q2 is connected with the driving system 30;

[0107] The first end of the fourth resistor R4 is connected with the control end of the second triode Q2, and the first end of the fourth resistor R4 is connected with the first end of the second triode Q2;

[0108] The first end of the transient suppression diode Z1 is connected with the second end of the first resistor R1, and the second end of the transient suppression diode Z1 is connected with the second end of the second triode Q2.

[0109] In the embodiment, when the power supply output end OUTPUT works normally, the first diode D1 is turned on, and the third resistor R3 is pulled to the voltage of the power supply end POWER, that is, the base of the second triode Q2 is cut off because of no current at this time. When the power supply output end OUTPUT is short-circuit fault, the first diode D1 is cut off, and the third resistor R3 is not affected by the first diode D1, so that the second triode Q2 is turned on, so that the loop formed by the power supply end POWER, the emitter of the second triode Q2, the base of the second triode Q2, the third resistor R3 and the twelfth resistor R12 provides voltage for the driving system 30 to send a short-circuit control signal to the driving system 30, and the driving system 30 stops transmitting the voltage of the power supply end POWER to the power supply output end OUTPUT after receiving the short-circuit control signal, thereby achieving the effect of short-circuit protection.

[0110] In addition, when there is an impact on the bus voltage of the power supply end POWER, the transient suppression diode Z1 prevents the sharp tip pulse, thereby protecting the full-controlled device K1 and preventing the full-controlled device K1 from being damaged.

[0111] In some optional embodiments, as shown in Figure 6 The diagnostic system 10 comprises:

[0112] The voltage dividing module 11 is connected with the reference voltage end Vref of the control system 20 and the input end of the control system 20 respectively;

[0113] Optionally, the voltage dividing module 11 can further comprise an electrostatic protection device, so as to protect the power supply when there is electrostatic interference. The voltage dividing module 11 can further comprise a reverse connection protection device, so as to protect the power supply when there is reverse connection. In addition, the voltage dividing module 11 can further comprise other protection devices.

[0114] When the control system 20 outputs the reference voltage, the control system 20 detects the open circuit, the short ground and the short power supply based on the voltage interval in which the adjusted output voltage is located;

[0115] When the control system 20 does not output the reference voltage, the control system 20 detects the short power supply based on the voltage interval in which the adjusted output voltage is located.

[0116] In the embodiment, the output voltage is collected by the voltage dividing module 11, and is transmitted to the input end of the control system 20 after being adjusted for the output voltage. The control system 20 divides the voltage into low-voltage, medium-voltage and high-voltage intervals for the adjusted voltage, judges the fault type based on the divided voltage interval, and controls the reference voltage end Vref through the control system 20. The control system judges the type of fault in combination with the controlled reference voltage end Vref and the received adjusted output voltage.

[0117] Specifically, the control system 20 outputs the reference voltage through the reference voltage end Vref. When judging whether the power supply output end OUTPUT is open circuit and short ground, if the adjusted output voltage received by the control system 20 is in the high-voltage interval, it is judged that the type of fault is open circuit, if the adjusted output voltage received by the control system 20 is in the low-voltage interval, it is judged that the type of fault is short ground, and if the adjusted output voltage received by the control system 20 is in the medium-voltage interval, it is normal and no fault occurs. Therefore, by stopping sending the driving signal to the driving system 30 when the fault is detected, the driving system 30 stops transmitting the voltage of the power supply end POWER to the power supply output end OUTPUT.

[0118] Whether the control system 20 outputs the reference voltage or not, since the voltage of the power supply end POWER is much larger than the reference voltage, when detecting whether the power supply output end OUTPUT is short power supply, the detection result only has the low-voltage interval and the high-voltage interval. If it is detected that the adjusted output voltage is in the low-voltage interval, it is normal, and if it is detected that the adjusted output voltage is in the high-voltage interval, it is judged that the short power supply fault occurs.

[0119] In some optional embodiments, as shown in Figure 7 The voltage dividing module 11 includes:

[0120] The second diode D2 has a first end connected with the reference voltage end;

[0121] Optionally, the second diode D2 plays a role of preventing reverse connection, thereby playing a role of protecting the power supply when the reverse connection occurs.

[0122] The seventh resistor R7 has a first end connected with the second end of the second diode D2, and a second end connected with the power supply output end OUTPUT;

[0123] an eighth resistor R8, a first end of the eighth resistor R8 is connected with the second end of the seventh resistor R7, and a second end of the eighth resistor R8 is connected with an input end of the control system 20;

[0124] a ninth resistor R9, a first end of the ninth resistor R9 is connected with the second end of the eighth resistor R8, and a second end of the ninth resistor R9 is grounded;

[0125] a second capacitor C2, a first end of the second capacitor C2 is connected with the second end of the eighth resistor R8, and a second end of the second capacitor C2 is grounded.

[0126] Specifically, the second capacitor C2 plays a role of protecting the power supply when there is electrostatic interference.

[0127] By adjusting the resistance values of the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9, the analog collection range of the adjusted output voltage received by the control system 20 is divided into low-voltage, medium-voltage and high-voltage intervals. Among them, the second diode D2 plays a role of preventing reverse connection.

[0128] Because the load is connected in parallel with the eighth resistor R8 and the ninth resistor R9, when the load changes, the voltage collected by the input end MCU_IN of the controller MCU will also change. For example, when the circuit is open, the resistance is infinite, therefore, the voltage collected by the input end MCU_IN of the controller MCU will also change.

[0129] In some optional embodiments, as shown in Figure 8 the control system 20 comprises:

[0130] a controller MCU, the controller MCU is connected with the diagnostic system 10, and is configured to receive the adjusted output voltage sent by the diagnostic system 10, and output a control signal based on the voltage range of the adjusted output voltage;

[0131] a switching module 21, the switching module 21 is connected with the controller MCU and the driving system 30 respectively, and is configured to send a driving signal to the driving system 30 based on the control signal.

[0132] Specifically, the switching module 21 receives the control signal of the controller MCU, and after being turned on, pulls down the voltage of the driving system 30, thereby playing a role of turning on the driving system 30. It is worth noting that even after pulling down the voltage of the driving system 30, if the first triode Q1 or the second triode Q2 is turned on, the voltage of the driving system 30 is pulled up, thereby preventing the driving system 30 from transmitting the voltage of the power supply end POWER to the power supply output end OUTPUT

[0133] In the embodiment, the input end MCU IN of the controller MCU receives the adjusted output voltage, and the controller MCU outputs an off control signal through the enable end MCU EN when a fault is detected, and outputs an on control signal through the enable end MCU EN when normality is detected.

[0134] In some alternative embodiments, as shown in FIG. 3, the switch module 21 comprises: Figure 9

[0135] The tenth resistor R10 has a first end connected to the controller MCU.

[0136] The third transistor Q3 has a control end connected to a second end of the tenth resistor R10, and a first end grounded.

[0137] The eleventh resistor R11 has a first end connected to the control end of the third transistor Q3, and a second end grounded.

[0138] The twelfth resistor R12 has a first end connected to a second end of the third transistor Q3, and a second end connected to a second end of the sixth resistor R6.

[0139] In the embodiment, the controller MCU outputs an off control signal through the enable end MCU EN when a fault is detected, and the third transistor Q3 is not turned on to send an off driving signal to the driving system 30. The controller MCU outputs an on control signal through the enable end MCU EN when normality is detected, and the third transistor Q3 is turned on to send an on driving signal to the driving system 30.

[0140] It should be noted that when the third transistor Q3 is turned on, the second transistor Q2 is turned off due to the voltage across the first capacitor C1 cannot be abruptly changed, and the gate of the full-controlled device K1 is grounded to be turned on. After the full-controlled device K1 is turned on, the gate of the second transistor Q2 is maintained at a high level to be turned off due to the first diode D1, and the full-controlled device K1 continuously outputs.

[0141] In some alternative embodiments, as shown in FIG. 3, the driving system 30 comprises: Figure 10

[0142] The third diode D3 has a first end connected to the power supply end POWER, and a second end connected to a first end of the first resistor R1.

[0143] ​​The control end of the full-controlled device K1 is connected with the first end of the sixth resistor R6, the first end of the full-controlled device K1 is connected with the second end of the first resistor R1, and the second end of the full-controlled device K1 is connected with the output end.

[0144] In the embodiment, the third diode D3 functions as an anti-reverse connection, and the full-controlled device K1 is a P-type MOS tube (MOSFET, Metal-Oxide-Semiconductor Field Effect Transistor).

[0145] When overcurrent occurs at the power supply output end OUTPUT, the first triode Q1 is turned on, so that the gate of the full-controlled device K1 is pulled high to the voltage of the power supply end POWER, and the full-controlled device K1 is turned off, at this time, the input end MCU_IN of the controller MCU collects the voltage in the low voltage interval; after the full-controlled device K1 is turned off, the overcurrent fault disappears, the first triode Q1 is turned off, and the full-controlled device K1 is continuously turned on, at this time, the input end MCU_IN of the controller MCU collects the voltage in the high voltage interval, at this time, the overcurrent is repeated to perform the above steps, the input end MCU_IN of the controller MCU can be set to collect the voltage in the low voltage interval for three times, and then it is considered that overcurrent occurs, the overcurrent fault is reported, and the controller MCU stops sending the on signal to the full-controlled device K1.

[0146] When the power supply output end OUTPUT is shorted, overcurrent protection is first performed to turn on the first triode Q1, and then the second triode Q2 is turned on, so that the gate of the full-controlled device K1 is pulled high to the voltage of the power supply end POWER, and the full-controlled device K1 is turned off, at this time, the input end MCU_IN of the controller MCU collects the voltage in the low voltage interval, and the short circuit fault is reported. It should be noted that at this time, the HSD state is locked, and the short circuit protection system is different from the overcurrent self-protection system, that is, the short circuit protection system will not realize self-driving, and as long as the short circuit fault does not disappear, it will be in the locked state.

[0147] When the controller MCU outputs the on control signal, the third triode Q3 is turned on, the gate of the full-controlled device K1 is pulled low, and the full-controlled device K1 is turned on.

[0148] In the embodiment, the utility model provides a kind of high side drive system, high side drive system includes as above diagnosis protection circuit and power supply end and output end OUTPUT, third triode in diagnosis protection circuit as the power switch of high side drive system, high side drive system diagnosis detects adjusted output voltage, and based on detection result, drive signal is sent to drive system, simultaneously, when overcurrent fault occurs in the HSD operation process, drive system is turned off by overcurrent self-protection system to reach the effect of overcurrent protection, even in overcurrent time control system misfire drive signal also does not open drive system, and in short ground, first drive system is turned off by overcurrent self-protection system to reach the effect of protection, then drive system is turned off by short ground protection system to reach the effect of drive state lock, even in short ground time control system misfire drive signal also does not open drive system, to greatly improve reliability and robustness, high side drive of self-diagnosis and protection in combination with fault is realized.

[0149] Although the embodiments of the utility model are described in conjunction with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A diagnostic protection circuit, characterized by The circuit comprises: a diagnostic system connected with the power supply end and the power supply output end respectively, for collecting and outputting the output voltage after adjustment; a control system connected with the diagnostic system, for receiving the output voltage after adjustment, detecting the output voltage after adjustment to obtain a detection result, and outputting a driving signal according to the detection result, wherein the detection result comprises a short power supply, an open circuit and a short ground; a driving system connected with the control system, the power supply end and the power supply output end respectively, for receiving the driving signal and controlling the voltage transmission of the power supply end to the power supply output end based on the driving signal; an overcurrent self-protection system connected with the power supply end, the driving system and the control system respectively, for outputting an overcurrent control signal to the driving system when overcurrent is detected, wherein the overcurrent control signal has a higher priority than the driving signal; a short ground protection system connected with the driving system and the control system respectively, for outputting a short ground control signal to the driving system when short ground is detected, wherein the short ground control signal has a higher priority than the driving signal.

2. The circuit of claim 1, wherein, The overcurrent self-protection system comprises: an overcurrent detection module connected with the driving system, for detecting a current signal of the driving system and outputting; an overcurrent control module connected with the overcurrent detection module and the driving system respectively, for receiving the current signal and outputting an overcurrent control signal to the driving system when overcurrent is detected based on the current signal.

3. The circuit of claim 2, wherein, The overcurrent detection module comprises: a first resistor, a first end of the first resistor being connected with the power supply end, and a second end of the first resistor being connected with the driving system and the overcurrent control module respectively; The overcurrent control module comprises: a first triode, a first end of the first triode being connected with the first end of the first resistor, and a second end of the first triode being connected with the driving system; a second resistor, a first end of the second resistor being connected with the second end of the first resistor, and a second end of the second resistor being connected with a control end of the first triode.

4. The circuit of claim 3, wherein, The short ground protection system comprises: a short ground detection module connected with the output end, for outputting a short ground signal when short ground is detected; a short ground control module connected with the short ground detection module and the driving system respectively, for receiving the short ground signal and outputting a short ground control signal to the driving system when short ground is detected based on the short ground signal.

5. The circuit of claim 4, wherein, The short ground detection module comprises: a first diode, a first end of the first diode being connected with the output end, and a second end of the first diode being connected with the short ground control module; The short ground control module comprises: a first capacitor, a first end of the first capacitor being connected with the second end of the first resistor; a third resistor, a first end of the third resistor being connected with the second end of the first diode and a second end of the first capacitor respectively. a second transistor, a control end of the second transistor being connected with a second end of the third resistor, a first end of the second transistor being connected with a second end of the first resistor, and a second end of the second transistor being connected with the driving system; a fourth resistor, a first end of the fourth resistor being connected with the control end of the second transistor, and a first end of the fourth resistor being connected with the first end of the second transistor; a transient voltage suppressor, a first end of the transient voltage suppressor being connected with the second end of the first resistor, and a second end of the transient voltage suppressor being connected with the second end of the second transistor; a fifth resistor, a first end of the fifth resistor being connected with the first end of the third resistor; a sixth resistor, a first end of the sixth resistor being connected with the second end of the second transistor and the driving system respectively, and a second end of the sixth resistor being connected with a second end of the fifth resistor.

6. The circuit of claim 5, wherein, The diagnostic system comprises: a voltage dividing module, the voltage dividing module being connected with a reference voltage end of the control system and an input end of the control system respectively; when the control system outputs a reference voltage, the control system detects open circuit, short ground and short power supply based on a voltage interval in which the adjusted output voltage is located; when the control system does not output the reference voltage, the control system detects short power supply based on a voltage interval in which the adjusted output voltage is located.

7. The circuit of claim 6, wherein, The voltage dividing module comprises: a second diode, a first end of the second diode being connected with the reference voltage end; a seventh resistor, a first end of the seventh resistor being connected with a second end of the second diode, and a second end of the seventh resistor being connected with the output end; an eighth resistor, a first end of the eighth resistor being connected with the second end of the seventh resistor, and a second end of the eighth resistor being connected with the input end of the control system; a ninth resistor, a first end of the ninth resistor being connected with the second end of the eighth resistor, and a second end of the ninth resistor being grounded; a second capacitor, a first end of the second capacitor being connected with the second end of the eighth resistor, and a second end of the second capacitor being grounded.

8. The circuit of claim 7, wherein, The control system comprises: a controller, the controller being connected with the diagnostic system, for receiving the adjusted output voltage sent by the diagnostic system, and outputting a control signal based on a voltage range of the adjusted output voltage; a switching module, the switching module being connected with the controller and the driving system respectively, for sending a driving signal to the driving system based on the control signal.

9. The circuit of claim 8, wherein, The switching module comprises: a tenth resistor, a first end of the tenth resistor being connected with the controller; a third transistor, a control end of the third transistor being connected with a second end of the tenth resistor, and a first end of the third transistor being grounded; an eleventh resistor, a first end of the eleventh resistor being connected with the control end of the third transistor, and a second end of the eleventh resistor being grounded; a twelfth resistor, a first end of the twelfth resistor being connected with a second end of the third transistor, and a second end of the twelfth resistor being connected with a second end of the sixth resistor.

10. The circuit of claim 9, wherein, The driving system comprises: A third diode, a first end of the third diode is connected with the power supply end, and a second end of the third diode is connected with the first end of the first resistor; A full-controlled device, a control end of the full-controlled device is connected with the first end of the sixth resistor, a first end of the full-controlled device is connected with the second end of the first resistor, and a second end of the full-controlled device is connected with the output end.

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