High-side driving circuit and electronic equipment

Abstract

A high-side driving circuit and an electronic device belong to the technical field of driving, a driving signal is received from a control end of a first switching circuit, and the first switching circuit transmits power supply direct current according to the driving signal; the inductive load generates induced electromotive force to the output end of the first switching circuit under the condition that the power supply direct current is disconnected; the first clamping circuit clamps the voltage between the control end of the first switching circuit and the input end of the first switching circuit, and outputs a conduction signal to the control end of the first switching circuit according to the power supply direct current; the first switching circuit transmits the power supply direct current according to the conduction signal to eliminate the induced electromotive force; therefore, the high-side driving circuit can be applied to an inductive load, and the safety and the reliability are improved.

Description

Technical Field

[0001] The present application belongs to the field of drive technology, and in particular relates to a high-side drive circuit and an electronic device. Background Art

[0002] The related high-side driving circuit includes a driving circuit and a switching circuit. The driving circuit outputs a driving signal, and the switching circuit transmits a power supply DC according to the driving signal to supply power to the load.

[0003] However, when the high-side drive circuit is used to power an inductive load, at the moment when the DC power supply is disconnected, the induced electromotive force generated by the inductive load causes the drain-gate voltage of the switch tube in the switching circuit to be too large, thereby causing the switch tube to break down and be damaged.

[0004] Therefore, the related high-side drive circuit cannot be applied to inductive loads, and has low safety and reliability. Utility Model Content

[0005] In view of the above problems, the present application provides a high-side drive circuit and an electronic device, aiming to solve the problem that the related high-side drive circuit cannot be applied to inductive loads and has low safety and reliability.

[0006] In a first aspect, the present application provides an embodiment of the present application that provides a high-side drive circuit connected to an inductive load, comprising a drive circuit, a first switch circuit, and a first clamp circuit;

[0007] The driving circuit is coupled to the control terminal of the first switch circuit, and is used to enable the first switch circuit to transmit power supply DC;

[0008] The inductive load is used to generate an induced electromotive force to the output end of the first switch circuit when the DC power supply is disconnected;

[0009] The first clamping circuit is connected to the first switch circuit, and is used to clamp the voltage between the control end of the first switch circuit and the input end of the first switch circuit, and output a conduction signal to the control end of the first switch circuit according to the power supply DC power;

[0010] The first switch circuit is further used to transmit the supply direct current according to the conduction signal to eliminate the induced electromotive force.

[0011] In the technical solution of the embodiment of the present application, when the power supply DC is disconnected, the inductive load generates an induced electromotive force; the first clamping circuit clamps the voltage between the control end of the first switching circuit and the input end of the first switching circuit, thereby clamping the drain-gate voltage of the switching tube in the switching circuit and reducing the possibility of breakdown of the switching tube; and the first clamping circuit also outputs a conduction signal according to the power supply DC so that the first switching circuit transmits the power supply DC according to the conduction signal to eliminate the induced electromotive force; thereby further protecting the drain-gate voltage of the switching tube in the switching circuit; therefore, reducing the possibility of breakdown of the switching tube, and improving the reliability and safety of the high-side drive circuit when applied to inductive loads.

[0012] In some embodiments, the driving circuit is specifically used to output a driving signal to enable the first switch circuit to transmit the power supply DC; the high-side driving circuit also includes:

[0013] A temperature detection circuit, for outputting a switch signal in response to a temperature greater than a preset temperature;

[0014] The second switch circuit is connected to the temperature detection circuit and the first switch circuit, and is used to connect the drive signal to the power ground according to the switch signal.

[0015] By adopting the above solution, when the temperature is greater than the preset temperature, the driving signal is connected to the power ground, so that the first switch circuit stops working, thereby achieving temperature protection of the high-side driving circuit.

[0016] In some embodiments, it also includes:

[0017] a current detection circuit, connected to the first switch circuit, the first clamp circuit and the inductive load, and configured to detect the current of the DC power supply to output a current detection signal;

[0018] A third switching circuit is connected to the current detection circuit, the drive circuit and the first switching circuit, and is used to connect the control end of the first switching circuit and the output end of the first switching circuit in response to the voltage of the current detection signal being greater than a first preset voltage, so that the first switching circuit stops transmitting the power supply DC.

[0019] By adopting the above solution, when the current of the power supply DC is greater than the first preset current, the first switch circuit stops transmitting the power supply DC, thereby achieving overcurrent protection of the high-side drive circuit.

[0020] In some embodiments, it also includes:

[0021] A second clamping circuit is connected to the driving circuit, the first switching circuit and the inductive load, and is used to clamp the second voltage in response to a second voltage between a control end of the first switching circuit and an output end of the first switching circuit being greater than a second preset voltage.

[0022] By adopting the above solution, since the second voltage between the control end of the first switch circuit and the output end of the first switch circuit is clamped, the possibility of breakdown of the switch tube in the first switch circuit is reduced, and the safety and reliability are further improved.

[0023] In some embodiments, the second clamping circuit includes a second voltage regulator tube and a sixth resistor.

[0024] The first end of the sixth resistor serves as the first end of the second clamping circuit, and is connected to the drive circuit and the control end of the first switch circuit; the second end of the sixth resistor is connected to the negative electrode of the second voltage regulator tube; the positive electrode of the second voltage regulator tube serves as the second end of the second clamping circuit, and is connected to the inductive load and the output end of the first switch circuit.

[0025] By adopting the above solution, the reliability of the second clamping circuit is improved and the circuit design is simplified.

[0026] In some embodiments, the driving circuit is specifically used to output a driving signal to enable the first switch circuit to transmit the power supply DC; the high-side driving circuit also includes:

[0027] A current limiting circuit is connected to the driving circuit and the first switching circuit, and is used to limit the current of the driving signal.

[0028] Through the above technical solution, the current of the driving signal is limited, thereby improving the reliability and safety of the high-side driving circuit.

[0029] In some embodiments, the driving circuit includes:

[0030] An oscillator circuit for outputting a square wave signal;

[0031] A charge pump circuit is connected to the oscillation circuit and the first switch circuit, and is used to boost the supply voltage based on the square wave signal to output a driving signal.

[0032] Through the above technical solution, the high-side drive of the first switch circuit can be realized through the oscillation circuit and the charge pump circuit, thereby simplifying the hardware design and reducing the cost.

[0033] In some embodiments, the first switch circuit includes a first field effect transistor and a first resistor;

[0034] The drain of the first field effect transistor serves as an input end of the first switch circuit and is connected to the first clamp circuit to receive a power supply DC;

[0035] The source of the first field effect transistor and the first end of the first resistor serve as output ends of the first switch circuit and are connected to the inductive load to output power supply direct current and receive the first negative electrode voltage;

[0036] The gate of the first field effect transistor and the second end of the first resistor serve as control ends of the first switch circuit and are connected to the drive circuit to receive a drive signal and output the second cathode voltage.

[0037] The above technical solution simplifies the hardware design and reduces the cost.

[0038] In some embodiments, the first clamping circuit includes a first voltage regulator and a second resistor;

[0039] The first end of the second resistor serves as the first end of the first clamping circuit and is connected to the first switch circuit to receive the power supply DC;

[0040] The second end of the second resistor is connected to the negative electrode of the first voltage regulator tube;

[0041] The positive electrode of the first voltage regulator tube serves as the second end of the first clamping circuit and is connected to the first switch circuit and the drive circuit to receive the second negative electrode voltage and output the conduction signal.

[0042] The first clamping circuit is simple and reliable.

[0043] In a second aspect, an embodiment of the utility model further provides an electronic device, which includes an inductive load and the above-mentioned high-side drive circuit.

[0044] By adopting the above solution, since the electronic device includes the high-side driving circuit of any of the above solutions, the safety and reliability of the high-side driving circuit can be improved, and can be applied to high-power scenarios.

[0045] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0047] Figure 1 A schematic diagram of a high-side driver circuit provided in one embodiment of the present application;

[0048] Figure 2 Another structural schematic diagram of a high-side driver circuit provided in an embodiment of the present application;

[0049] Figure 3 Another structural schematic diagram of a high-side driver circuit provided in an embodiment of the present application;

[0050] Figure 4 Another structural schematic diagram of a high-side driver circuit provided in an embodiment of the present application;

[0051] Figure 5 Another structural schematic diagram of a high-side driver circuit provided in an embodiment of the present application;

[0052] Figure 6 A schematic diagram of a structure of a driving circuit in a high-side driving circuit provided in an embodiment of the present application;

[0053] Figure 7 A partial circuit schematic diagram of a high-side driver circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0056] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0057] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0059] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0060] At present, judging from the development of the market situation, the application of inductive load drive is becoming more and more extensive. Inductive loads are widely used in transportation tools such as electric bicycles, motorcycles, and automobiles, as well as in aerospace and other fields. With the continuous expansion of the application field of inductive loads, the market demand is also constantly expanding.

[0061] In order to solve the problem of poor reliability and safety, the applicant has found that the first clamping circuit can be connected to the first switching circuit in design, and the inductive load generates an induced electromotive force when the power supply DC is disconnected. The voltage between the control end of the first switching circuit and the input end of the first switching circuit is clamped by the first clamping circuit, and a conduction signal is output according to the power supply DC, so that the first switching circuit transmits the power supply current to the inductive load to eliminate the induced electromotive force; thereby, the safety and reliability of the high-side drive circuit are improved while being applied to the inductive load.

[0062] The high-side drive circuit disclosed in the embodiment of the present application can be used for an electrical device that uses an inductive load as a load. The electrical device can be, but is not limited to, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0063] According to some embodiments of the present application, referring to Figure 1 , Figure 1 A schematic diagram of the structure of a high-side driver circuit provided in an embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0064] The high-side driving circuit is connected to the inductive load L, and includes a driving circuit 01 , a first switching circuit 02 and a first clamping circuit 03 .

[0065] The driving circuit 01 is coupled to the control end of the first switch circuit 02, and is used to enable the first switch circuit 02 to transmit the power supply DC. In a specific implementation, the driving circuit 01 is used to output a driving signal. The first switch circuit 02 is connected to the inductive load L and the driving circuit 01, and is specifically used to turn on or off the transmission of the power supply DC according to the driving signal.

[0066] The inductive load L is used to generate an induced electromotive force to the output end of the first switch circuit 02 when the DC power supply is disconnected; in a specific implementation, the inductive load L is specifically used to generate an induced electromotive force when the DC power supply is disconnected to output a first negative voltage. The first switch circuit 02 is also used to output a second negative voltage according to the first negative voltage.

[0067] The first clamping circuit 03 is connected to the first switching circuit 02, and is used to clamp the voltage between the control end of the first switching circuit 02 and the input end of the first switching circuit 02, and output a conduction signal to the control end of the first switching circuit 02 according to the power supply DC power. In a specific implementation, the first clamping circuit 03 is specifically used to clamp a first voltage between the voltage of the power supply DC power and the second negative electrode voltage, and output a conduction signal according to the power supply DC power.

[0068] The first switch circuit 02 is also used to transmit the supply DC power according to the conduction signal to eliminate the induced electromotive force.

[0069] It can be understood that the drive circuit 01 outputs a drive signal to the control end of the first switch circuit 02, the input end of the first switch circuit 02 receives the power supply DC, the first switch circuit 02 transmits the power supply DC from the output end to the inductive load L according to the drive signal, and disconnects the output of the power supply DC according to the stop of the drive signal; the inductive load L generates an induced electromotive force in the case of power supply DC to output a first negative voltage to the output end of the first switch circuit 02, and the first switch circuit 02 outputs a second negative voltage from the control end according to the first negative voltage; the first clamping circuit 03 clamps the first voltage between the voltage of the power supply DC and the second negative voltage (i.e., between the input end of the first switch circuit 02 and the control end of the first switch circuit 02), and outputs a conduction signal to the control end of the first switch circuit 02 according to the power supply DC; the first switch circuit 02 transmits the power supply DC to the inductive load L according to the conduction signal to eliminate the induced electromotive force.

[0070] In the technical solution of the embodiment of the present application, when the power supply DC is disconnected, the inductive load L generates an induced electromotive force; the first clamping circuit 03 clamps the voltage between the control end of the first switch circuit 02 and the input end of the first switch circuit 02, thereby clamping the drain-gate voltage of the switch tube in the switch circuit and reducing the possibility of breakdown of the switch tube; and the first clamping circuit 03 also outputs a conduction signal according to the power supply DC so that the first switch circuit 02 transmits the power supply DC according to the conduction signal to eliminate the induced electromotive force, thereby further protecting the drain-gate voltage of the switch tube in the switch circuit; therefore, the possibility of breakdown of the switch tube is reduced, and while being applied to the inductive load L, the reliability and safety of the high-side drive circuit are improved.

[0071] According to some embodiments of the present application, optionally, please continue to refer to Figure 2 , Figure 2 A schematic diagram of the structure of a high-side driver circuit provided by another embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0072] The above high-side drive circuit is Figure 1 In addition to all the components and assemblies of the high-side driver circuit shown, the high-side driver circuit also includes a temperature detection circuit 04 and a second switch circuit 05 .

[0073] The driving circuit 01 is specifically used to output a driving signal to enable the first switch circuit 02 to transmit power supply direct current.

[0074] The temperature detection circuit 04 is used to output a switch signal in response to the temperature being greater than a preset temperature.

[0075] The second switch circuit 05 is connected to the temperature detection circuit 04 and the first switch circuit 02, and is used to connect the driving signal to the power ground according to the switch signal.

[0076] In one embodiment, the temperature detection circuit 04 is specifically configured to output a switch signal according to a first enable signal in response to a temperature greater than a preset temperature, wherein the temperature may be an ambient temperature or a temperature of the first switch circuit.

[0077] It can be understood that the second switch circuit 05 connects the drive signal to the power ground according to the switch signal, so that the control end of the first switch circuit 02 is connected to the power ground, and the first switch circuit 02 stops transmitting the power supply DC to the inductive load L.

[0078] By adopting the above solution, when the temperature is greater than the preset temperature, the driving signal is connected to the power ground, so that the first switch circuit 02 stops working, thereby achieving temperature protection of the high-side driving circuit.

[0079] According to some embodiments of the present application, optionally, please continue to refer to Figure 3 , Figure 3 A schematic diagram of the structure of a high-side driver circuit provided by another embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0080] The above high-side drive circuit is Figure 1 In addition to all the components and assemblies of the high-side driving circuit shown, the high-side driving circuit also includes a current detection circuit 06 and a third switch circuit 07 .

[0081] The current detection circuit 06 is connected to the first switch circuit 02, the first clamp circuit 03 and the inductive load L, and is used to detect the current of the DC power supply to output a current detection signal.

[0082] The third switch circuit 07 is connected to the current detection circuit 06, the drive circuit 01 and the first switch circuit 02, and is used to connect the control end of the first switch circuit 02 and the output end of the first switch circuit 02 in response to the voltage of the current detection signal being greater than the first preset voltage, so that the first switch circuit 02 stops transmitting the power supply DC.

[0083] It can be understood that by connecting the control end of the first switch circuit 02 and the output end of the first switch circuit 02, the gate-source voltage of the switch tube in the first switch circuit 02 is made 0V, so that the first switch circuit 02 stops transmitting the power supply DC.

[0084] By adopting the above solution, when the current of the power supply DC is greater than the first preset current, the first switch circuit 02 stops transmitting the power supply DC, thereby achieving overcurrent protection of the high-side drive circuit.

[0085] According to some embodiments of the present application, optionally, please continue to refer to Figure 4, Figure 4 A schematic diagram of the structure of a high-side driver circuit provided by another embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0086] The above high-side drive circuit is Figure 1 In addition to all components and assemblies of the high-side driver circuit shown, the high-side driver circuit also includes a second clamping circuit 08 .

[0087] The second clamping circuit 08 is connected to the driving circuit 01, the first switching circuit 02 and the inductive load L, and is used to clamp the second voltage in response to a second voltage between the control end of the first switching circuit 02 and the output end of the first switching circuit 02 being greater than a second preset voltage.

[0088] It can be understood that the second voltage between the control end of the first switch circuit 02 and the output end of the first switch circuit 02 is clamped, and when the first switch circuit 02 includes an N-type switch tube, the gate-source voltage of the switch tube in the first switch circuit 02 is protected.

[0089] By adopting the above solution, since the second voltage between the control end of the first switch circuit 02 and the output end of the first switch circuit 02 is clamped, the possibility of breakdown of the switch tube in the first switch circuit 02 is reduced, and the safety and reliability are further improved.

[0090] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 , Figure 5 A schematic diagram of the structure of a high-side driver circuit provided by another embodiment of the present application is shown. For ease of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0091] The above high-side drive circuit is Figure 1 In addition to all components and assemblies of the high-side driver circuit shown, the high-side driver circuit also includes a current limiting circuit 09 .

[0092] The driving circuit 01 is specifically used to output a driving signal to enable the first switch circuit 02 to transmit power supply direct current.

[0093] The current limiting circuit 09 is connected to the driving circuit 01 and the first switch circuit 02, and is used to limit the current of the driving signal.

[0094] It can be understood that the current limiting circuit 09 may include a current limiting resistor, and by limiting the current of the driving signal, the possibility of damage to the switch tube in the first switch circuit 02 caused by a large current is reduced.

[0095] Through the above technical solution, the current of the driving signal is limited, thereby improving the reliability and safety of the high-side driving circuit.

[0096] In some embodiments, optionally, please continue to refer to Figure 6 The driving circuit 01 includes an oscillation circuit 011 and a charge pump circuit 012 .

[0097] The oscillation circuit 011 is used to output a square wave signal.

[0098] The charge pump circuit 012 is connected to the oscillation circuit 011 and the first switch circuit 02, and is used to boost the supply voltage based on the square wave signal to output a driving signal.

[0099] In one embodiment, the oscillator circuit 011 is specifically configured to output a square wave signal according to the second enable signal. The charge pump circuit 012 may include a multi-stage charge pump boost circuit.

[0100] Through the above technical solution, the high-side drive of the first switch circuit 02 can be realized through the oscillation circuit 011 and the charge pump circuit 012, thereby simplifying the hardware design and reducing the cost.

[0101] In some embodiments, optionally, refer to Figure 7 The first switch circuit 02 includes a first field effect transistor M1 and a first resistor R1.

[0102] The drain of the first field effect transistor M1 serves as the input end of the first switch circuit 02, and is connected to the first clamp circuit 03 to receive the power supply DC; the source of the first field effect transistor M1 and the first end of the first resistor R1 serve as the output end of the first switch circuit 02, and are connected to the inductive load L to output the power supply DC and receive the first negative voltage; the gate of the first field effect transistor M1 and the second end of the first resistor R1 serve as the control end of the first switch circuit 02, and are connected to the drive circuit 01 to receive the drive signal and output the second negative voltage.

[0103] It can be understood that the first resistor R1 plays a role in generating a gate-source voltage of the first field effect transistor M1.

[0104] The first switch circuit 02 has a simple circuit and low cost.

[0105] In some embodiments, optionally, please continue to refer to Figure 7 , the first clamping circuit 03 includes a first voltage regulator tube Z1 and a second resistor R2;

[0106] The first end of the second resistor R2 serves as the first end of the first clamping circuit 03, and is connected to the first switching circuit 02 to receive the DC power supply; the second end of the second resistor R2 is connected to the negative electrode of the first voltage regulator tube Z1; the positive electrode of the first voltage regulator tube Z1 serves as the second end of the first clamping circuit 03, and is connected to the first switching circuit 02 and the driving circuit 01 to receive the second negative electrode voltage and output a conduction signal.

[0107] The first clamping circuit 03 is simple and reliable.

[0108] In some embodiments, optionally, please continue to refer to Figure 7 The second clamping circuit 08 includes a second voltage regulator tube Z2 and a sixth resistor R6.

[0109] The first end of the sixth resistor R6 serves as the first end of the second clamping circuit 08, and is connected to the driving circuit 01 and the control end of the first switch circuit 02; the second end of the sixth resistor R6 is connected to the negative electrode of the second voltage regulator tube Z2; the positive electrode of the second voltage regulator tube Z2 serves as the second end of the second clamping circuit 08, and is connected to the inductive load L and the output end of the first switch circuit 02.

[0110] By adopting the above solution, the reliability of the second clamping circuit is improved and the circuit design is simplified.

[0111] In some embodiments, optionally, please continue to refer to Figure 7 The temperature detection circuit 04 includes a first voltage source DC1, a comparator U1, a first inverter U2, a second inverter U3, a NAND gate U4, a temperature sensitive diode D0 and a second resistor R2.

[0112] The positive electrode of the first voltage source DC1 is connected to the first power supply VDD, the negative electrode of the first voltage source DC1 is connected to the first end of the second resistor R2 and the positive electrode of the temperature sensitive diode D0, the negative electrode of the temperature sensitive diode D0 is connected to the power ground, the second end of the second resistor R2 is connected to the non-inverting input end of the comparator U1, the output end of the comparator U1 is connected to the input end of the first inverter U2, the output end of the first inverter U2 is connected to the input end of the second inverter U3, and the output end of the second inverter U3 is connected to the first input end of the NAND gate U4; the inverting input end of the comparator U1 serves as the reference voltage input end of the temperature detection circuit 04 to receive the reference voltage; the second input end of the NAND gate U4 serves as the enable signal input end of the temperature detection circuit 04 to receive the first enable signal EN1; the output end of the NAND gate U4 serves as the switch signal output end of the temperature detection circuit 04, and is connected to the second switch circuit 05 to output the switch signal.

[0113] The second switch circuit 05 includes a second field effect transistor M2 and a third resistor R3.

[0114] The gate of the second field effect transistor M2 serves as the switching signal input terminal of the second switch circuit 05, and is connected to the temperature detection circuit 04 to receive the switching signal; the drain of the second field effect transistor M2 serves as the driving signal input terminal of the second switch circuit 05, and is connected to the driving circuit 01 and the first switch circuit 02 to receive the driving signal; the source of the second field effect transistor M2 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the power ground.

[0115] The current detection circuit 06 includes a third field effect transistor M3, a fourth resistor R4 and a fifth resistor R5.

[0116] The drain of the third field effect transistor M3 serves as the DC power supply input terminal of the current detection circuit 06, and is connected to the first switch circuit 02 and the first clamp circuit 03 to receive the DC power supply; the source of the third field effect transistor M3 is connected to the first end of the fourth resistor R4; the second end of the fourth resistor R4 and the first end of the fifth resistor R5 serve together as the current detection signal output terminal of the current detection circuit 06, and are connected to the third switch circuit 07 to output the current detection signal; the second end of the fifth resistor R5 serves as the DC power supply output terminal of the current detection circuit 06, and is connected to the inductive load L, the first switch circuit 02 and the third switch circuit 07 to output the DC power supply.

[0117] The third switch circuit 07 includes a fourth field effect transistor M4.

[0118] The gate of the fourth field effect transistor M4 serves as the control end of the third switch circuit 07 and is connected to the current detection circuit 06 to receive a current detection signal; the drain of the fourth field effect transistor M4 serves as the first end of the third switch circuit 07 and is connected to the drive circuit 01 and the control end of the first switch circuit 02; the source of the fourth field effect transistor M4 serves as the second end of the third switch circuit 07 and is connected to the inductive load L and the output end of the first switch circuit 02.

[0119] The current limiting circuit 09 includes a seventh resistor R7.

[0120] The first end of the seventh resistor R7 serves as the driving signal input end of the current limiting circuit 09 and is connected to the driving circuit 01 to receive the driving signal; the second end of the seventh resistor R7 serves as the driving signal output end of the current limiting circuit 09 and is connected to the first switching circuit 02 to output the driving signal.

[0121] The oscillation circuit 011 includes a second voltage source DC2, a hysteresis comparator U5, a third inverter U6, a fifth field effect transistor M5, a first capacitor C1 and an eighth resistor R8;

[0122] The positive electrode of the second voltage source DC2 is connected to the first power supply VDD, the negative electrode of the second voltage source DC2 is connected to the input end of the hysteresis comparator U5, the drain of the fifth field effect transistor M5 and the first end of the first capacitor C1, the output end of the hysteresis comparator U5 is connected to the input end of the third inverter U6, the input end of the third inverter U6 and the first end of the first capacitor C1, the source of the fifth field effect transistor M5 is connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected to the power ground; the output end of the third inverter U6 and the gate of the fifth field effect transistor M5 are used together as the square wave signal output end of the oscillation circuit 011, and are connected to the charge pump circuit 012 to output the square wave signal; the enable end of the hysteresis comparator U5 is used as the enable signal input end of the oscillation circuit 011 to receive the second enable signal EN2.

[0123] The charge pump circuit 012 includes a fourth inverter U7, a fifth inverter U8, a first switch K1, a first diode D1, a second diode D2, a third diode D3, a second capacitor C2 and a third capacitor C3;

[0124] The input end of the fourth inverter U7 is connected to the oscillation circuit 011 as the square wave signal input end of the charge pump circuit 012 to receive the square wave signal; the output end of the fourth inverter U7 is connected to the first end of the second capacitor C2 and the input end of the fifth inverter U8, the output end of the fifth inverter U8 is connected to the first end of the third capacitor C3, the first end of the first switch K1 is connected to the first power supply VDD, the second end of the first switch K1 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the second end of the second capacitor C2 and the anode of the second diode D2, the cathode of the second diode D2 is connected to the second end of the third capacitor C3 and the anode of the third diode D3; the cathode of the third diode D3 is connected to the first switch circuit 02 as the drive signal output end of the charge pump circuit 012 to output the drive signal; the control end of the first switch K1 is connected to the enable signal input end of the charge pump circuit 012 to receive the third enable signal EN3.

[0125] Combine the following Figure 7 The circuit principle is explained as follows:

[0126] When receiving the second enable signal EN2, the hysteresis comparator U5 starts to work and charges the first capacitor C1. When the voltage at the input end of the hysteresis comparator U5 is greater than the comparator threshold, the output signal of the hysteresis comparator U5 is inverted to a first low-level signal, and then inverted and output to a first high-level signal by the third inverter U6. The first high-level signal controls the fifth field effect transistor M5 to turn on, so that the voltage of the input signal of the hysteresis comparator U5 is pulled down, and the first capacitor C1 is discharged. When the voltage of the input signal of the hysteresis comparator U5 is less than the comparator threshold, the output of the hysteresis comparator U5 is turned on. The signal is inverted into a second high-level signal, and then inverted and outputted into a second low-level signal by the third inverter U6. The second low-level signal controls the fifth field effect tube M5 to be turned off, thereby continuing to charge the first capacitor C1. This is repeated to generate a square wave signal. The square wave signal is received by the fourth inverter U7 and the fifth inverter U8 in order to generate a complementary square wave to power the charge pump. After the charge pump (including capacitors and diodes) boosts the voltage of the drive signal, the voltage of the drive signal is greater than the turn-on voltage Vth of the first field effect tube M1, so that the first field effect tube is turned on to drive the inductive load L.

[0127] When the driving signal stops, the first field effect transistor M1 disconnects the output of the power supply DC; the inductive load L generates an induced electromotive force based on the disconnection of the power supply DC to output a first negative voltage to the source of the first field effect transistor M1; the first field effect transistor M1 outputs a second negative voltage from the gate of the first field effect transistor M1 according to the first negative voltage; at this time, the first voltage regulator Z1 breaks down, clamps a first voltage between the voltage of the power supply DC and the second negative voltage, and outputs a conduction signal to the gate of the first field effect transistor M1 according to the power supply DC; the conduction signal raises the gate-source voltage of the first field effect transistor M1, and when the gate-source voltage of the first field effect transistor M1 is greater than the turn-on voltage, the first field effect transistor M1 is turned on and transmits the power supply DC to the inductive load L to eliminate the induced electromotive force.

[0128] When the temperature rises, the forward voltage of the temperature-sensitive diode D0 decreases as the temperature rises, and the voltage at the non-inverting input terminal of the comparator U1 decreases. When it drops to the reference voltage, the output signal of the comparator U1 is reversed from a high level to a low level, and after two inversions, it outputs a low level. When receiving the first enable signal EN1, it outputs a high level after passing through the NAND gate U4. At this time, the second field effect transistor M2 is turned on, and the gate of the first field effect transistor M1 is pulled down and turned off, thereby protecting the entire circuit.

[0129] When a short circuit occurs in the driving circuit 01, the current at both ends of the source and drain of the first field effect tube M1 suddenly increases. Since the first field effect tube M1 and the third field effect tube M3 are connected in parallel, the current at both ends of the drain and source of the third field effect tube M3 will increase. At this time, after voltage division by the fourth resistor R4 and the fifth resistor R5, a current detection signal is output. When the voltage of the current detection signal rises to the first preset voltage, the fourth field effect tube M4 connects the gate of the first field effect tube M1 and the source of the first field effect tube M1, so that the gate-source voltage of the first field effect tube M1 is less than the turn-on voltage, thereby limiting the current of the DC power supply to protect the circuit from being burned.

[0130] When the voltage of the driving signal increases abnormally, the second voltage regulator tube Z2 breaks down, clamping the gate-source voltage of the first field effect tube M1 within a preset range.

[0131] According to some embodiments of the present application, the present application also provides an electronic device, including a capacitive load and a high-side driving circuit of any of the above solutions.

[0132] Since the electronic device includes the high-side driving circuit of any of the above solutions, the safety and reliability of the high-side driving circuit can be improved, and can be applied to high-power scenarios.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A high-side drive circuit, characterized in that: connected to the inductive load, comprising a first switch circuit and a first clamp circuit; The driving circuit is coupled to the control terminal of the first switch circuit, and is used to enable the first switch circuit to transmit power supply DC; The inductive load is used to generate an induced electromotive force to the output end of the first switch circuit when the DC power supply is disconnected; The first clamping circuit is connected to the first switch circuit, and is used to clamp the voltage between the control end of the first switch circuit and the input end of the first switch circuit, and output a conduction signal to the control end of the first switch circuit according to the power supply DC power; The first switch circuit is further used to transmit the supply direct current according to the conduction signal to eliminate the induced electromotive force.

2. The high-side driver circuit according to claim 1, characterized in that: The driving circuit is specifically used to output a driving signal to enable the first switch circuit to transmit the power supply DC; The high-side driving circuit also includes: A temperature detection circuit, for outputting a switch signal in response to a temperature greater than a preset temperature; The second switch circuit is connected to the temperature detection circuit and the first switch circuit, and is used to connect the drive signal to the power ground according to the switch signal.

3. The high-side driver circuit according to claim 1, characterized in that: Also includes: a current detection circuit, connected to the first switch circuit, the first clamp circuit and the inductive load, and configured to detect the current of the DC power supply to output a current detection signal; A third switching circuit is connected to the current detection circuit, the drive circuit and the first switching circuit, and is used to connect the control end of the first switching circuit and the output end of the first switching circuit in response to the voltage of the current detection signal being greater than a first preset voltage, so that the first switching circuit stops transmitting the power supply DC.

4. The high-side driver circuit according to claim 1, characterized in that: Also includes: A second clamping circuit is connected to the driving circuit, the first switching circuit and the inductive load, and is used to clamp the second voltage in response to a second voltage between a control end of the first switching circuit and an output end of the first switching circuit being greater than a second preset voltage.

5. The high side driver circuit according to claim 4, characterized in that: The second clamping circuit includes a second voltage regulator tube and a sixth resistor; The first end of the sixth resistor serves as the first end of the second clamping circuit, and is connected to the drive circuit and the control end of the first switch circuit; the second end of the sixth resistor is connected to the negative electrode of the second voltage regulator tube; the positive electrode of the second voltage regulator tube serves as the second end of the second clamping circuit, and is connected to the inductive load and the output end of the first switch circuit.

6. The high-side driver circuit according to claim 1, characterized in that: The driving circuit is specifically used to output a driving signal to enable the first switch circuit to transmit the power supply DC; The high-side driving circuit also includes: A current limiting circuit is connected to the driving circuit and the first switching circuit, and is used to limit the current of the driving signal.

7. The high-side driver circuit according to claim 1, characterized in that: The driving circuit comprises: An oscillator circuit for outputting a square wave signal; A charge pump circuit is connected to the oscillation circuit and the first switch circuit, and is used to boost the supply voltage based on the square wave signal to output a driving signal.

8. The high-side driver circuit according to any one of claims 1 to 7, characterized in that: The first switch circuit includes a first field effect transistor and a first resistor; The drain of the first field effect transistor serves as an input end of the first switch circuit and is connected to the first clamp circuit to receive a power supply DC; The source of the first field effect transistor and the first end of the first resistor serve as output ends of the first switch circuit and are connected to the inductive load to output power supply direct current and receive a first negative voltage; The gate of the first field effect transistor and the second end of the first resistor serve as control ends of the first switch circuit and are connected to the drive circuit to receive a drive signal and output a second negative voltage.

9. The high-side driver circuit according to any one of claims 1 to 7, characterized in that: The first clamping circuit includes a first voltage regulator tube and a second resistor; The first end of the second resistor serves as the first end of the first clamping circuit and is connected to the first switch circuit to receive the power supply DC; The second end of the second resistor is connected to the negative electrode of the first voltage regulator tube; The positive electrode of the first voltage regulator tube serves as the second end of the first clamping circuit and is connected to the first switch circuit and the drive circuit to receive the second negative electrode voltage and output the conduction signal.

10. An electronic device, characterized in that: The electronic device comprises an inductive load and a high-side driving circuit as claimed in any one of claims 1 to 9.

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