Vehicle-mounted high-side driving control circuit

Abstract

The utility model discloses a vehicle-mounted high-side driving control circuit, which comprises a control module, a switch module, a high-side driving chip, a feedback resistor and a load interface, the enabling end of the control module is electrically connected with the input end of the high-side driving chip; the output end of the control module is electrically connected with the control end of the switch module; the current input end of the switch module is electrically connected with the input end of the high-side driving chip; the current output end of the switch module is grounded; the first end of the feedback resistor is electrically connected with the input end of the high-side driving chip; the second end of the feedback resistor is electrically connected with the output end of the high-side driving chip; and the output end of the high-side driving chip is electrically connected with the load interface. According to the utility model, the driving continuous output is ensured to be effective through the positive feedback circuit so as to keep the function of an important load, the reliability of the circuit is improved, and safety guarantee is provided for drivers and passengers.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vehicle-mounted high-side drive control, especially to a vehicle-mounted high-side drive control circuit. BACKGROUND

[0002] At present, many loads in the whole vehicle are controlled by using high-side drive chips, such as high beam, low beam and suspension power distribution control of the whole vehicle. When the MCU drives the high-side chip effectively, the high-side drive output is controlled. If the MCU is abnormally reset due to sudden voltage fluctuation or external battery interference when the MCU drives the high-side chip effectively, the drive of the load may be interrupted if no drive retention circuit design is adopted. Therefore, for the high-side drive output of important functions, it is necessary to ensure that the output drive function is still effective when the control part (MCU) is abnormal.

[0003] However, at present, most of the load control outputs are directly controlled by the MCU high-side drive chip, and the IO pin of the MCU controls the input pin of the high-side drive chip. When the IO pin of the MCU is low, the high-side drive output is low, and when the IO pin of the MCU is high, the drive output is high. The current control circuit cannot realize the function of drive output retention, and when the MCU program runs away, the MCU control IN pin level is 0V, which will cause the output to be unexpectedly closed, thereby causing the loss of important functions and seriously affecting the safety of the driver and passenger. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of vehicle-mounted high-side drive control circuit, can solve the technical problem that load drive is interrupted when control module appears abnormal, and the function of important load is kept by guaranteeing drive output to be continuously effective by positive feedback circuit, improve the reliability of circuit, provide safety guarantee for driver and passenger.

[0005] One embodiment of the utility model provides a kind of vehicle-mounted high-side drive control circuit, comprising: control module, switch module, high-side drive chip, feedback resistance and load interface;

[0006] The enable end of the control module is electrically connected with the input end of the high-side drive chip;The output end of the control module is electrically connected with the control end of the switch module;The current input end of the switch module is electrically connected with the input end of the high-side drive chip;The current output end of the switch module is grounded;The first end of the feedback resistance is electrically connected with the input end of the high-side drive chip;The second end of the feedback resistance is electrically connected with the output end of the high-side drive chip;The output end of the high-side drive chip is electrically connected with load interface.

[0007] Further, the vehicle-mounted high-side drive control circuit further comprises: a first diode;

[0008] The first diode is arranged between the enable end of the control module and the input end of the high-side drive chip; the anode of the first diode is electrically connected with the enable end of the control module; and the cathode of the first diode is electrically connected with the input end of the high-side drive chip.

[0009] Further, the vehicle-mounted high-side drive control circuit further comprises a second diode.

[0010] The second diode is arranged between the feedback resistor and the input end of the high-side drive chip; the anode of the second diode is electrically connected with the feedback resistor; and the cathode of the second diode is electrically connected with the input end of the high-side drive chip.

[0011] Further, the vehicle-mounted high-side drive control circuit further comprises a first resistor.

[0012] The first end of the first resistor is electrically connected with the current input end of the switch module; and the second end of the first resistor is electrically connected with the input end of the high-side drive chip.

[0013] Further, the vehicle-mounted high-side drive control circuit further comprises a voltage stabilizing module.

[0014] The voltage stabilizing module comprises a second resistor and a first capacitor; the second resistor and the first capacitor are connected in parallel; a first common electrical connection point of the second resistor and the first capacitor is electrically connected with the output end of the high-side drive chip; and a second common electrical connection point of the second resistor and the first capacitor is grounded.

[0015] Further, the vehicle-mounted high-side drive control circuit further comprises a circuit protection module.

[0016] The circuit protection module comprises a third resistor, a fourth resistor and a fifth resistor; the first end of the third resistor is electrically connected with the output end of the control module; the second end of the third resistor is electrically connected with the first end of the fourth resistor; the second end of the fourth resistor is grounded; a common electrical connection point between the third resistor and the fourth resistor is electrically connected with the control end of the switch module; the first end of the fifth resistor is electrically connected with the first end of the first resistor; and the second end of the fifth resistor is grounded.

[0017] Further, the vehicle-mounted high-side drive control circuit further comprises a sixth resistor.

[0018] The sixth resistor is arranged between the enable end of the control module and the first diode; the first end of the sixth resistor is electrically connected with the enable end of the control module; and the second end of the sixth resistor is electrically connected with the anode of the first diode.

[0019] Furthermore, the vehicle-mounted high-side driver control circuit further includes: a power supply module;

[0020] The power module includes a second capacitor and an external power interface; the first end of the second capacitor is electrically connected to the external power interface; the second end of the second capacitor is grounded; and the common electrical connection point between the second capacitor and the external power interface is electrically connected to the power end of the high-side driver chip.

[0021] Furthermore, the switch module is a transistor, specifically:

[0022] The base of the transistor is electrically connected to the output end of the control module; the collector of the transistor is electrically connected to the input end of the high-side driver chip; and the emitter of the transistor is grounded.

[0023] Furthermore, the transistor includes a triode or a field effect transistor.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The vehicle-mounted high-side drive control circuit of the present invention adopts a high-side drive chip plus a positive feedback loop. When an abnormality occurs in the control module, the drive output is guaranteed to remain valid to maintain the function of important loads and provide safety for drivers and passengers. The present invention only uses feedback resistors to form a positive feedback loop, which reduces process costs and improves circuit reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a circuit diagram of a vehicle-mounted high-side driver control circuit provided by an embodiment of the utility model;

[0027] Figure 2 This is another circuit diagram of the vehicle-mounted high-side drive control circuit provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In the description of the present application, it is to be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, 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 indirectly connected through an intermediate medium, it can be the communication inside two elements. 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.

[0031] Please refer to Figure 1 It is a circuit schematic diagram of the vehicle-mounted high-side drive control circuit provided by the embodiment of the present application, which comprises: a control module MCU, a switch module Q1, a high-side drive chip HSD, a feedback resistor and a load interface.

[0032] The enable end of the control module MCU is electrically connected with the input end of the high-side drive chip HSD, the output end of the control module MCU is electrically connected with the control end of the switch module Q1, the current input end of the switch module Q1 is electrically connected with the input end of the high-side drive chip HSD, the current output end of the switch module Q1 is grounded, the first end of the feedback resistor is electrically connected with the input end of the high-side drive chip HSD, the second end of the feedback resistor is electrically connected with the output end of the high-side drive chip HSD, and the output end of the high-side drive chip HSD is electrically connected with the load interface.

[0033] The vehicle-mounted high-side drive control circuit of the present application adopts a high-side drive chip HSD plus a positive feedback loop, which ensures that the drive output is still effective when the control module MCU is abnormal, so as to maintain the function of the important load and provide safety protection for the driver and passenger. The present application only uses a feedback resistor to form a positive feedback loop, which reduces the process cost and improves the reliability of the circuit.

[0034] See Figure 2 Another circuit schematic diagram of the vehicle-mounted high-side drive control circuit provided by the embodiment of the present application is provided. The connection mode of the vehicle-mounted high-side drive control circuit provided by the embodiment of the present application is described in detail below. Figure 2 The connection mode of the vehicle-mounted high-side drive control circuit provided by the embodiment of the present application is described in detail.

[0035] In the embodiment, the vehicle-mounted high-side drive control circuit further comprises a first diode D1.

[0036] The first diode D1 is arranged between the enable end of the control module MCU and the input end of the high-side drive chip HSD; the anode of the first diode D1 is electrically connected with the enable end of the control module MCU; and the cathode of the first diode D1 is electrically connected with the input end of the high-side drive chip HSD.

[0037] In the embodiment of the utility model, first diode D1 is arranged between the enable end of control module MCU, that is, the EN end of control module MCU, and the input end of high-side drive chip HSD, for guaranteeing the unidirectional flow of current in the circuit, controlling the output of current from the enable end of control module MCU to the input end of high-side drive chip HSD, avoiding the backflow of current from high-side drive chip HSD to control module MCU, and protecting the safety of the circuit.

[0038] In the embodiment, the vehicle-mounted high-side drive control circuit further comprises a second diode D2;

[0039] The second diode D2 is arranged between the feedback resistor and the input end of the high-side drive chip HSD; the anode of the second diode D2 is electrically connected with the feedback resistor; and the cathode of the second diode D2 is electrically connected with the input end of the high-side drive chip HSD.

[0040] In the embodiment of the utility model, second diode D2 is arranged between feedback resistor and the input end of high-side drive chip HSD, for guaranteeing the unidirectional flow of current in the circuit, controlling the flow of current from feedback resistor to the input end of high-side drive chip HSD, avoiding the backflow of current from high-side drive chip HSD to feedback resistor, and protecting the safety of the circuit.

[0041] In the embodiment, the vehicle-mounted high-side drive control circuit further comprises a first resistor R1;

[0042] The first end of the first resistor R1 is electrically connected with the current input end of the switch module Q1; and the second end of the first resistor R1 is electrically connected with the input end of the high-side drive chip HSD.

[0043] In the embodiment of the utility model, first resistor R1 is arranged between switch module Q1 and high-side drive chip HSD, can limit the size of current, protect other elements in the circuit from being damaged, thereby guaranteeing the stability of the circuit.

[0044] In the embodiment, the vehicle-mounted high-side drive control circuit further comprises a voltage stabilizing module;

[0045] The voltage stabilizing module includes a second resistor R2 and a first capacitor C1; the second resistor R2 and the first capacitor C1 are connected in parallel; a first common electrical connection point between the second resistor R2 and the first capacitor C1 is electrically connected to the output end of the high-side driver chip HSD; and a second common electrical connection point between the second resistor R2 and the first capacitor C1 is grounded.

[0046] In this embodiment of the utility model, a voltage stabilization module is connected to the output of the high-side driver chip HSD to prevent circuit oscillation. The voltage stabilization module includes a second resistor R2 and a first capacitor C1. The second resistor R2 and the first capacitor C1 are connected in parallel to filter out noise interference in the circuit. The parallel second resistor R2 absorbs the electrical energy of the first capacitor C1, preventing excessive discharge current and ensuring circuit safety.

[0047] In this embodiment, the vehicle-mounted high-side driver control circuit further includes: a circuit protection module;

[0048] The circuit protection module includes a third resistor R3, a fourth resistor R4 and a fifth resistor R5; the first end of the third resistor R3 is electrically connected to the output end of the control module MCU; the second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4; the second end of the fourth resistor R4 is grounded; the common electrical connection point between the third resistor R3 and the fourth resistor R4 is electrically connected to the control end of the switch module Q1; the first end of the fifth resistor R5 is electrically connected to the first end of the first resistor R1; and the second end of the fifth resistor R5 is grounded.

[0049] In an embodiment of the present utility model, a circuit protection module is provided in the vehicle-mounted high-side drive control circuit for voltage division and current limiting to protect the circuit. The circuit protection module includes a third resistor R3, a fourth resistor R4 and a fifth resistor R5. Among them, the third resistor R3 is provided between the control terminal of the control module MCU and the switch module Q1, which can limit the current size and protect other components in the circuit from damage, thereby ensuring circuit stability. The fourth resistor R4 is electrically connected to the control terminal of the switch module Q1, so that the control terminal of the switch module Q1 is first connected to a resistor and then grounded, which can play a role in current limiting, preventing the control terminal current of the switch module Q1 from being too large, and protecting the components in the circuit from being damaged. The fifth resistor R5 is provided between the current output terminal of the switch module Q1 and the first resistor, and plays a role in voltage division and current limiting, thereby ensuring circuit safety.

[0050] In this embodiment, the vehicle-mounted high-side driver control circuit further includes: a sixth resistor R6;

[0051] The sixth resistor R6 is arranged between the control module MCU and the first diode D1, can limit the current size, prevent the current output by the control module MCU from being too large, protect other elements in the circuit from being damaged, and thus guarantee the stability of the circuit.

[0052] In the embodiment of the utility model, the sixth resistor R6 is arranged between the control module MCU and the first diode D1, can limit the current size, prevent the current output by the control module MCU from being too large, protect other elements in the circuit from being damaged, and thus guarantee the stability of the circuit.

[0053] In the embodiment, the vehicle-mounted high-side drive control circuit further comprises a power module.

[0054] The power module comprises a second capacitor C2 and an external power supply interface; a first end of the second capacitor C2 is electrically connected with the external power supply interface; a second end of the second capacitor C2 is grounded; and a common electrical connection point of the second capacitor C2 and the external power supply interface is electrically connected with a power supply end of the high-side drive chip HSD.

[0055] In the embodiment of the utility model, the power module is used for supplying power to the circuit. The power module comprises a second capacitor C2 and an external power supply interface, and the external power supply interface is connected with the power supply end of the high-side drive chip HSD, so that the power supply function is realized. The power module is further provided with the second capacitor C2, one end of the second capacitor C2 is connected with the external power supply interface, and the other end is grounded. The second capacitor C2 plays a role of energy storage and filtering, can prevent the current output by the external power supply interface from being too large, and can provide a short-term current supply when the power supply voltage is transiently changed, so as to stabilize the voltage and avoid the influence of voltage fluctuation on the circuit.

[0056] In the embodiment, the switch module Q1 is a transistor, specifically:

[0057] The base of the transistor is electrically connected with the output end of the control module MCU; the collector of the transistor is electrically connected with the input end of the high-side drive chip HSD; and the emitter of the transistor is grounded.

[0058] In the embodiment of the utility model, the switch module Q1 is a transistor, and the transistor is connected with the control module MCU. According to the characteristics of the transistor, the output voltage of the control module MCU can be reduced according to the demand, so as to realize the function of important loads.

[0059] In the embodiment, the transistor comprises a triode or a field effect tube.

[0060] In the embodiment of the utility model, the switch module Q1 can be a triode or a field effect tube, and the conduction characteristics of the triode or the field effect tube can realize the function of the circuit.

[0061] In combination Figure 2 The working process of the vehicle-mounted high-side drive control circuit provided by the embodiment is described in detail.

[0062] The utility model discloses on the basis of the control of control module MCU, can realize the keeping function of output function through increasing feedback circuit.

[0063] When the EN end of control module MCU is high level, the Release end of control module MCU is low level, switch module Q1 is not conducted, and the input end of high-side drive chip HSD is high level.When the EN end of control module MCU is low level, the Release end of control module MCU is low level, switch module Q1 is not conducted, and the voltage high-low state of the input end of high-side drive chip HSD is determined according to the signal transmission of feedback resistance.When the EN end of control module MCU is low level, the Release end of control module MCU is high level, switch module Q1 is conducted, and the input end of high-side drive chip HSD is low level.

[0064] Optionally, when the signal transmission of feedback resistance is high level signal, the input end of high-side drive chip HSD is high level, and when the signal transmission of feedback resistance is low level signal, the input end of high-side drive chip HSD is low level.And the signal transmission of feedback resistance is determined according to the driving state of the load unit at the previous moment.

[0065] Optionally, when the input end of high-side drive chip HSD is high level, the output end of control high-side drive chip HSD is high level, and the load unit is driven, and when the input end of high-side drive chip HSD is low level, the output end of control high-side drive chip HSD is low level, and the load unit is stopped.

[0066] Optionally, when the load unit is driven, feedback resistance transmits high level signal to the input end of high-side drive chip HSD, and when the load unit is not driven, feedback resistance transmits low level signal to the input end of high-side drive chip HSD.

[0067] As an example of the embodiment, when the enable end, i.e. EN end of control module MCU outputs 5V, the output end, i.e. Release end of control module MCU is low, switch module Q1 is not conducted, the output end, i.e. OUT end of high-side drive chip HSD outputs 12V, and control module MCU controls high-side drive chip HSD to open, and the load is driven.

[0068] As an example of this embodiment, when the software program corresponding to the control module MCU runs out of control or is abnormal, the EN terminal of the control module MCU outputs a low level, and the Rel ease terminal outputs a low level. At this time, the switch module Q1 is not turned on, but because the feedback resistor flows the 12V output of the high-side driver chip HSD to the input terminal of the high-side driver chip HSD, the input terminal of the high-side driver chip HSD is still at a high level. At this time, the output of the high-side driver chip HSD maintains a 12V output, so that the driving load remains effective;

[0069] As an example of this embodiment, when the control module MCU receives an instruction to turn off the drive output, the EN terminal of the control module MCU outputs a low level and the Rel ease terminal outputs a high level. At this time, the switch module Q1 is turned to ground, so that the input terminal of the high-side driver chip HSD is a low level. At this time, the output of the output terminal of the high-side driver chip HSD is 0, and the load drive output is turned off.

[0070] The implementation of the present invention has the following beneficial effects:

[0071] This embodiment of the utility model utilizes a high-side driver chip coupled with a positive feedback loop in an on-board high-side driver control circuit. This solves the technical problem of load drive interruption when a control module anomalies occur. When a control module anomaly occurs, the positive feedback circuit ensures continuous and effective drive output, maintaining the functionality of critical loads and providing safety for drivers and passengers. This embodiment of the utility model utilizes only feedback resistors to form a positive feedback loop, reducing process costs and improving circuit reliability.

[0072] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A vehicle-mounted high-side driver control circuit, characterized in that: include: Control module, switch module, high-side driver chip, feedback resistor and load interface; The enable end of the control module is electrically connected to the input end of the high-side driver chip; the output end of the control module is electrically connected to the control end of the switch module; the current input end of the switch module is electrically connected to the input end of the high-side driver chip; the current output end of the switch module is grounded; the first end of the feedback resistor is electrically connected to the input end of the high-side driver chip; the second end of the feedback resistor is electrically connected to the output end of the high-side driver chip; and the output end of the high-side driver chip is electrically connected to the load interface.

2. The vehicle-mounted high-side driver control circuit according to claim 1, wherein: Also includes: a first diode; The first diode is arranged between the enable end of the control module and the input end of the high-side driver chip; the anode of the first diode is electrically connected to the enable end of the control module; and the cathode of the first diode is electrically connected to the input end of the high-side driver chip.

3. The vehicle-mounted high-side driver control circuit according to claim 1, wherein: Also includes: a second diode; The second diode is arranged between the feedback resistor and the input end of the high-side driver chip; The anode of the second diode is electrically connected to the feedback resistor; the cathode of the second diode is electrically connected to the input end of the high-side driver chip.

4. The vehicle-mounted high-side driver control circuit according to claim 1, wherein: Also includes: a first resistor; The first end of the first resistor is electrically connected to the current input end of the switch module; the second end of the first resistor is electrically connected to the input end of the high-side driver chip.

5. The vehicle-mounted high-side driver control circuit according to claim 1, wherein: Also includes: Voltage regulator module; The voltage stabilizing module includes a second resistor and a first capacitor; the second resistor and the first capacitor are connected in parallel; A first common electrical connection point between the second resistor and the first capacitor is electrically connected to the output end of the high-side driver chip; and a second common electrical connection point between the second resistor and the first capacitor is grounded.

6. The vehicle-mounted high-side driver control circuit according to claim 4, characterized in that: Also includes: Circuit protection module; The circuit protection module includes a third resistor, a fourth resistor and a fifth resistor; the first end of the third resistor is electrically connected to the output end of the control module; the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is grounded; the common electrical connection point between the third resistor and the fourth resistor is electrically connected to the control end of the switch module; the first end of the fifth resistor is electrically connected to the first end of the first resistor; and the second end of the fifth resistor is grounded.

7. The vehicle-mounted high-side driver control circuit according to claim 2, wherein: Also includes: a sixth resistor; The sixth resistor is arranged between the enable terminal of the control module and the first diode; the first end of the sixth resistor is electrically connected to the enable terminal of the control module; and the second end of the sixth resistor is electrically connected to the anode of the first diode.

8. The vehicle-mounted high-side driver control circuit according to claim 1, wherein: Also includes: Power module; The power module includes a second capacitor and an external power interface; the first end of the second capacitor is electrically connected to the external power interface; the second end of the second capacitor is grounded; and the common electrical connection point between the second capacitor and the external power interface is electrically connected to the power end of the high-side driver chip.

9. The vehicle-mounted high-side driver control circuit according to claim 1, wherein: The switch module is a transistor, specifically: The base of the transistor is electrically connected to the output end of the control module; the collector of the transistor is electrically connected to the input end of the high-side driver chip; and the emitter of the transistor is grounded.

10. The vehicle-mounted high-side driver control circuit according to claim 9, wherein: The transistor includes a triode or a field effect transistor.

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