Adjusting circuit of driving current, gate driving chip and electronic equipment

Abstract

The invention provides a driving current adjusting circuit, a gate driving chip and electronic equipment. The adjusting circuit comprises a detection circuit used for detecting the operation state of the adjusting circuit and outputting a first voltage signal; the power supply generating circuit is used for outputting a second voltage signal, and the voltage value of the second voltage signal is adjusted through the first voltage signal; the gate driving circuit is used for outputting a first current signal under the driving of the second voltage signal; wherein the output end of the detection circuit is connected with the control end of the power supply generation circuit, and the output end of the power supply generation circuit is connected with the input end of the gate driving module. Through the adjusting circuit, the area of a circuit board can be reduced, and the design difficulty, the production cost and the use cost of an electronic product are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of integrated circuits, and more specifically to a driving current regulating circuit, a gate driving chip and an electronic device. Background Art

[0002] In existing electronic products, power semiconductor devices are usually used to provide current signals. Therefore, if multiple different current signals are to be provided, multiple power tubes are required. This not only increases the area of ​​the circuit board, but also increases the difficulty of designing electronic products, resulting in a significant increase in the production cost and use cost of electronic products. Summary of the invention

[0003] The present application is proposed in view of the above problems. The present application provides a driving current regulating circuit, a gate driving chip and an electronic device, which can reduce the area of ​​a circuit board, reduce the design difficulty of electronic products, and reduce the production cost and use cost of electronic products.

[0004] According to a first aspect of the present application, a driving current regulating circuit is provided, the regulating circuit comprising:

[0005] A detection circuit, used for detecting the operating state of the regulating circuit and outputting a first voltage signal;

[0006] a power supply generating circuit, configured to output a second voltage signal, wherein a voltage value of the second voltage signal is adjusted by the first voltage signal;

[0007] a gate driving circuit, configured to output a first current signal under the drive of the second voltage signal;

[0008] Wherein, the output end of the detection circuit is connected to the control end of the power generation circuit, and the output end of the power generation circuit is connected to the input end of the gate driving module.

[0009] The above technical solution has the following advantages or beneficial effects: by multiplexing the input port of the power generation circuit and the output port of the detection circuit, the output voltage of the power generation circuit, that is, the input voltage of the gate drive circuit, can be changed, thereby changing the output current of the gate drive circuit, thereby effectively reducing the number of power tubes and the area of ​​the circuit board, solving the problems of large circuit board area and high production and use costs of electronic products, and reducing the design difficulty of the product as well as the production and use costs of the product.

[0010] In some embodiments of the present application, the power generation circuit includes at least one second switch circuit;

[0011] The second switch circuit comprises:

[0012] A first inverter;

[0013] A second inverter, an input terminal of the second inverter being connected to an output terminal of the first inverter;

[0014] a second switch element, wherein a control terminal of the second switch element is connected to an output terminal of the second inverter;

[0015] a second resistor connected between the first end and the second end of the second switch element;

[0016] The second switching circuit is configured to control the second switching element to be cut off and the second resistor to be turned on as a current path when the input voltage signal is greater than 5 volts after the input voltage signal is converted by the first inverter and the second inverter, so that the second voltage signal is determined based on the resistance value of the second resistor.

[0017] The above technical solution has the following advantages or beneficial effects: filtering can be achieved through the first inverter and the second inverter, and a one-to-one corresponding second switch element and a second resistor are set in the second switch circuit. The conduction or cutoff of the second switch element determines whether the corresponding second resistor is connected to the second switch circuit, thereby adjusting the first voltage signal output by the power supply generating circuit.

[0018] In some embodiments of the present application, the first inverter is a threshold inverter.

[0019] The above technical solution has the following advantages or beneficial effects: by setting different thresholds, the output signal of the inverter at different input voltages can be controlled, and then the second resistor can be controlled to be turned on as a current path, thereby adjusting the voltage value of the second voltage signal.

[0020] In some embodiments of the present application, the power generation circuit further includes a first switch circuit;

[0021] The first switch circuit comprises:

[0022] a first operational amplifier;

[0023] a first resistor;

[0024] A first switch element, wherein a first end of the first switch element is connected to an input power supply, a control end of the first switch element is connected to an output end of the first operational amplifier, and a second end of the first switch element is connected to a first end of the first resistor.

[0025] The above technical solution has the following advantages or beneficial effects: when the non-inverting input terminal of the first amplifier is connected to the reference voltage, the first switch element is turned on, and the voltage at the first end of the first resistor is equal to the reference voltage, thereby copying the reference voltage to the first end of the first resistor.

[0026] In some embodiments of the present application, a control signal generating circuit is provided between the output end of the detection circuit and the control end of the power generating circuit.

[0027] The control signal generating circuit comprises:

[0028] a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series, and a connection end of the third resistor and the fourth resistor is connected to a control end of the power generation circuit;

[0029] A second operational amplifier, wherein the non-inverting input terminal of the second operational amplifier is connected to the output terminal of the detection circuit, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is connected to the third resistor.

[0030] The above technical solution has the following advantages or beneficial effects:

[0031] The third resistor and the fourth resistor form a voltage dividing resistor, which can output a follow-up signal of the input voltage signal at the same-direction input terminal through the second operational amplifier. The follow-up signal is divided by the third resistor and the fourth resistor, thereby generating a control signal. The control signal is input into the power generating circuit, thereby adjusting the voltage value of the second voltage signal output by the power generating circuit.

[0032] In some embodiments of the present application, the detection circuit includes at least one of an overcurrent protection circuit, an overtemperature protection circuit and a temperature detection circuit.

[0033] The above technical solution has the following advantages or beneficial effects: Since the driving current regulation circuit is usually provided with an overcurrent protection circuit, an overtemperature protection circuit or a temperature detection circuit, the output signal of the above circuit is used as an input control signal to realize signal multiplexing, which can effectively reduce the complexity of the circuit and reduce the circuit cost.

[0034] In some embodiments of the present application, the detection circuit further includes:

[0035] A first comparator, wherein an inverting input terminal of the first comparator is used to input a reference voltage signal, and a non-inverting input terminal of the first comparator is connected to an output terminal of at least one of the overcurrent protection circuit, the overtemperature protection circuit and the temperature detection circuit;

[0036] A third switch element, wherein a control end of the third switch element is connected to the output end of the first comparator, a first end of the third switch element is connected to the non-inverting input end of the second operational amplifier, and a second end is grounded.

[0037] The above technical solution has the following advantages or beneficial effects: by setting the reference voltage signal, the output signal of the first comparator can be adjusted, so that the driving signal of the third switching element can be obtained according to the different output signals of the overcurrent protection circuit, the over-temperature protection circuit and the temperature detection circuit, and the third switching element can be driven to output the first voltage signal.

[0038] In some embodiments of the present application, the gate driving circuit includes:

[0039] a third inverter;

[0040] Two fourth inverters, input ends of the two fourth inverters are connected to the output end of the third inverter;

[0041] a fourth switch element, wherein a first end of the fourth switch element is connected to an input power supply, and a control end of the fourth switch element is connected to output ends of the two fourth inverters;

[0042] A fifth switch element, wherein a control end of the fifth switch element is connected to the output ends of the two fourth inverters, a first end of the fifth switch element is connected to the second end of the fourth switch element, and a second end of the fifth switch element is grounded.

[0043] The above technical solution has the following advantages or beneficial effects: the current signal can be amplified by the third inverter and the fourth inverter, thereby effectively driving the fourth switch element and the fifth switch element. When the input signal is high, the fourth switch element and the fifth switch element can be turned on to output the driving current; when the input signal is low, the output of the driving current is stopped.

[0044] According to a second aspect of the present application, a gate driving chip is provided, the gate driving chip comprising a bandgap reference circuit and the above-mentioned driving current regulating circuit;

[0045] The bandgap reference circuit is used to generate a reference voltage with a zero temperature coefficient;

[0046] The regulating circuit is used to output an adjustable current signal based on the reference voltage.

[0047] The above technical solution has the following advantages or beneficial effects: since the gate drive chip includes the above drive current regulation circuit, the size of the chip can be reduced, the chip design difficulty as well as the chip production cost and use cost can be reduced.

[0048] According to a third aspect of the present application, an electronic device is provided, comprising a load circuit and the above-mentioned gate drive chip, wherein an output end of the gate drive chip is connected to an input end of the load circuit.

[0049] The above technical solution has the following advantages or beneficial effects: since the electronic device includes a gate drive chip, the volume of the electronic device can be reduced, and the design difficulty, production cost and use cost of the electronic device can be reduced.

[0050] The driving current regulating circuit of the present application can change the output voltage of the power generation circuit, that is, the input voltage of the gate drive circuit, and then change the output current of the gate drive circuit by multiplexing the input port of the power generation circuit and the output port of the detection circuit, thereby effectively reducing the number of power tubes and the area of ​​the circuit board, solving the problems of large circuit board area and high production and use costs of electronic products, and reducing the design difficulty of the product as well as the production and use costs of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above and other purposes, features and advantages of the present invention will become more apparent by describing the embodiments of the present invention in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0052] Figure 1 is a schematic block diagram of a driving current regulating circuit according to some embodiments of the present application;

[0053] Figure 2 is a schematic block diagram of a second switch circuit according to some embodiments of the present application;

[0054] Figure 3 is a schematic block diagram of a power generation circuit according to some embodiments of the present application;

[0055] Figure 4 is a schematic block diagram of a control signal generating circuit according to some embodiments of the present application;

[0056] Figure 5 is a schematic block diagram of a driving current regulating circuit according to some embodiments of the present application;

[0057] Figure 6 is a schematic block diagram of a gate driving circuit according to some embodiments of the present application;

[0058] Figure 7 is a schematic block diagram of a gate driving chip according to some embodiments of the present application;

[0059] Figure 8 is a schematic block diagram of an electronic device according to some embodiments of the present application. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0061] In view of the problem that existing electronic products usually use multiple power semiconductor devices to provide different current signals, which increases the design difficulty of electronic products and thus leads to a significant increase in the production cost and use cost of electronic products, the present application proposes a driving current regulation circuit, a gate drive chip and an electronic device, which are described in detail below.

[0062] First, refer to Figure 1 The driving current regulating circuit 100 according to some embodiments of the present application is described.

[0063] like Figure 1 As shown, the driving current regulating circuit 100 includes:

[0064] A detection circuit, used for detecting the operating state of the regulating circuit and outputting a first voltage signal;

[0065] A power generation circuit, used for outputting a second voltage signal, wherein a voltage value of the second voltage signal is adjusted by the first voltage signal;

[0066] A gate driving circuit, used for outputting a first current signal under the drive of a second voltage signal;

[0067] The output end of the detection circuit is connected to the control end of the power generation circuit, and the output end of the power generation circuit is connected to the input end of the gate driving module.

[0068] It should be noted that Figure 1 The components and structure of the driving current regulating circuit 100 shown are merely exemplary and not restrictive. The regulating circuit may also have other components and structures as required.

[0069] According to some embodiments of the present application, the power generation circuit includes at least one second switching circuit.

[0070] Next, refer to Figure 2To describe the second switching circuit according to some embodiments of the present application.

[0071] like Figure 2 As shown, the second switch circuit includes:

[0072] A first inverter INV1;

[0073] A second inverter INV2, wherein an input end of the second inverter INV2 is connected to an output end of the first inverter INV1;

[0074] A second switch element Q2, a control end of the second switch element Q2 is connected to an output end of the second inverter INV2;

[0075] A second resistor R2, the second resistor R2 is connected between the first end and the second end of the second switch element Q2;

[0076] The second switch circuit is configured to control the second switch element Q2 to be turned off and the second resistor R2 to be turned on as a current path when the input voltage signal is greater than 5 volts after the input voltage signal is converted by the first inverter INV1 and the second inverter INV2, so that the second voltage signal is determined based on the resistance value of the second resistor.

[0077] Specifically, the second switch element Q2 may be a field effect transistor. Filtering may be achieved through the first inverter and the second inverter, and a one-to-one corresponding second switch element Q2 and a second resistor R2 are provided in the second switch circuit, and whether the corresponding second resistor is connected to the second switch circuit is determined by the conduction or cutoff of the second switch element, so that the first voltage signal output by the power supply generating circuit can be adjusted.

[0078] According to some embodiments of the present application, the first inverter is a threshold inverter.

[0079] The threshold value can be set according to actual needs, and this application does not specifically limit the specific value of the threshold value.

[0080] It should be noted that, when the power generation circuit includes one more second switch circuit, the thresholds of the threshold inverters in each second switch circuit may be the same or different.

[0081] By setting different thresholds, the output signal of the inverter at different input voltages can be controlled, thereby controlling the second resistor to be turned on as a current path, thereby adjusting the voltage value of the second voltage signal.

[0082] Next, refer to Figure 3 To describe a power generation circuit according to some embodiments of the present application.

[0083] like Figure 3 As shown, the power generation circuit also includes a first switch circuit and a plurality of second switch circuits

[0084] The number of the second switch circuits can be selected according to the actual situation, and this application does not limit it. In order to simplify the description process, in the embodiment of this application, Figure 3 The three second switch circuits shown are taken as examples for explanation.

[0085] like Figure 3 As shown, the first switch circuit includes: a first operational amplifier A1, a first resistor R1, and a first switch element Q1; the first end of the first switch element Q1 is connected to the input power supply VCC, the control end of the first switch element Q1 is connected to the output end of the first operational amplifier, and the second end of the first switch element Q1 is connected to the first end of the first resistor R1. The reference voltage VREF is copied between the first resistor R1 and the second resistor through the first operational amplifier A1, which is conducive to the precise control of the second output voltage.

[0086] Exemplarily, the first switching element Q1 is an NMOS tube, and the output end of the first operational amplifier A1 is connected to the control end of the first switching element Q1, which is the gate of the NMOS tube, so that the voltage at the second end of the first resistor R1 is equal to the reference voltage VREF, that is, the reference voltage VREF is copied to the second end of the first resistor R1.

[0087] The first switch element Q1, the first resistor R1 and a plurality of second resistors are connected in series between the power supply VCC and the ground. When there are multiple second resistors, they are respectively second resistors R21, R22, and R23. The second resistors R21, R22, and R23 are respectively connected in parallel with the second switch tube Q2. By way of example, when there are multiple second resistors, the resistance value of each second resistor can be the same or different. By way of example, the number of first resistors R1 can also be multiple, and the number of first resistors R1 can be selected according to actual conditions. This application does not limit this. In the embodiment of this application, one first resistor R1 is used as an example for explanation.

[0088] The detection circuit generates a first voltage signal as a control signal CON. The control signal CON controls the conduction of the non-conducting resistors through three inverters INV11, INV12, and INV13 with different threshold voltages. When CON<5V, the CON voltage is insufficient to turn on INV11, INV12, and INV13. At this time, the internal power supply of the chip is VO. When CON>5V, due to the different threshold voltages of the three inverters INV11, INV12, and INV13, they are respectively connected to the control end of the second switch tube Q2, thereby controlling the conduction and cutoff of the second switch tube Q2, and then controlling the number of second resistors R21, R22, and R23 connected to the second switch circuit, thereby adjusting the resistance value in the power generation circuit, and adjusting the power generation circuit to output a second output voltage VO with different voltage values ​​through the resistance value.

[0089] According to the power generation circuit provided in the present application, by setting a second resistor and a second switch tube connected in parallel with the second resistor, and using a control signal CON to control the conduction and cutoff of the second switch tube, different second voltage signals can be obtained conveniently and simply.

[0090] According to some embodiments of the present application, a control signal generating circuit is further provided between the output end of the detection circuit and the control end of the power generating circuit.

[0091] Next, refer to Figure 4 To describe the control signal generating circuit according to some embodiments of the present application.

[0092] like Figure 4 As shown, the control signal generating circuit includes a third resistor R3 and a fourth resistor R4, the third resistor R3 and the fourth resistor R4 are connected in series, and the connection end of the third resistor R4 and the fourth resistor R4 is connected to the control end of the power generating circuit.

[0093] The control signal generating circuit also includes a second operational amplifier A2, the non-inverting input terminal of the second operational amplifier A2 is connected to the output terminal of the detection circuit, the inverting input terminal of the second operational amplifier A2 is connected to the output terminal of the second operational amplifier A2, and the output terminal of the second operational amplifier A2 is connected to the third resistor.

[0094] The voltage signal FO generates a voltage follower signal FO' through the second operational amplifier A2. FO' generates a control signal CON through resistor voltage division. The CON signal is input into the module power generation circuit.

[0095] Through the control signal generating circuit of this embodiment, different voltage signals can be output to meet the input requirements of the control signal of the power generating circuit.

[0096] According to some embodiments of the present application, the detection circuit includes at least one of an overcurrent protection circuit, an overtemperature protection circuit and a temperature detection circuit.

[0097] Specifically, the overcurrent protection circuit, the overtemperature protection circuit and the temperature detection circuit may adopt existing circuits, and the overcurrent protection circuit, the overtemperature protection circuit and the temperature detection circuit are used to output the detection voltage signal of the detection circuit.

[0098] Since the driving current regulation circuit is usually provided with an overcurrent protection circuit, an overtemperature protection circuit or a temperature detection circuit, the output signal of the above circuit is used as an input control signal to realize signal multiplexing, which can effectively reduce the complexity of the circuit and reduce the circuit cost.

[0099] Next, refer to Figure 5 To describe the driving current regulation circuit according to some embodiments of the present application.

[0100] like Figure 5 As shown, the driving current regulation circuit includes a power generation circuit 120, a gate driving circuit 130, and a logic control circuit 140. The power generation circuit 120 generates a low-voltage power supply for the internal operation of the chip, and the low-voltage power supply supplies power to the logic control circuit 140 and the gate driving circuit 130.

[0101] The detection circuit includes an overcurrent protection circuit, a first comparator C1, and a third switch element Q3.

[0102] The inverting input terminal of the first comparator C1 is used to input a reference voltage signal, the non-inverting input terminal of the first comparator C1 is connected to the output terminal of the overcurrent protection circuit, and the output terminal of the first comparator C1 is respectively connected to the input terminal of the logic control circuit and the control terminal of the third switch element Q3.

[0103] A first end of the third switch element Q3 is connected to a second end of the fifth resistor R5 , and a first end of the fifth resistor R5 is connected to an input power source VCC.

[0104] The first end of the third switch element Q3 is also connected to the non-inverting input end of the second operational amplifier in the above embodiment, and the second end is grounded.

[0105] In this embodiment, the logic control circuit may be a controller, and the controller may be various controllers commonly used by those skilled in the art, such as a single-chip microcomputer controller, a microcontroller unit, and a programmable logic controller, etc. For example, the signal generator SG receives a control instruction from the controller, and outputs a corresponding control signal according to the control instruction to control the second switch tube.

[0106] In this embodiment, the overcurrent protection signal is compared with the reference voltage, and a functional protection signal is generated through a comparator, and the functional protection signal is input into the logic control circuit, so that the logic control circuit can control the output of the gate drive circuit. The functional protection signal can also control the conduction and cutoff of the third switch element Q3.

[0107] In this embodiment, the FO port signal is multiplexed as the control signal CON of the power generation circuit. The control signal controls the selection of the internal resistor of the power generation circuit, thereby changing the internal low-voltage power supply of the chip.

[0108] Next, refer to Figure 6 To describe the gate driving circuit according to some embodiments of the present application.

[0109] like Figure 6 As shown, the gate driving circuit includes: a third inverter INV3, two fourth inverters INV4, a fourth switching element Q4, and a fifth switching element Q5.

[0110] The input ends of the two fourth inverters INV4 are connected to the output end of the third inverter INV3; the first end of the fourth switch element Q4 is connected to the input power supply VCC, and the control end of the fourth switch element Q4 is connected to the output ends of the two fourth inverters INV4; the control end of the fifth switch element Q5 is connected to the output ends of the two fourth inverters INV4, the first end of the fifth switch element is connected to the second end of the fourth switch element, and the second end of the fifth switch element is grounded.

[0111] The two fourth inverters INV4 are connected in parallel to amplify the input current signal, thereby meeting the current requirement for driving the fourth switch element Q4 and the fifth switch element Q5.

[0112] It should be noted that the gate driving circuit further includes a plurality of fifth inverters and a plurality of sixth inverters, so as to further increase the current signal.

[0113] On the other hand, the present application Figure 7 As shown, a gate driving chip 200 is also provided, comprising a bandgap reference circuit 210 and a driving current regulating circuit 220 as in any of the above embodiments;

[0114] A bandgap reference circuit 210, for generating a reference voltage with a zero temperature coefficient;

[0115] The regulating circuit 220 is used to output an adjustable current signal based on a reference voltage.

[0116] Here, the bandgap reference circuit 210 generates a reference voltage with a zero temperature coefficient, and then generates a low-voltage power supply signal for the internal operation of the regulation circuit 220 through this zero temperature coefficient reference voltage. The detection circuit generates a first voltage signal to compare with the reference voltage, and generates a second voltage signal through a comparator. The second voltage signal is transmitted to the gate drive circuit to obtain a current signal.

[0117] On the other hand, the present application Figure 8 As shown, an electronic device 300 is also provided, including a load circuit 310 and a gate driving chip 320 as in any of the above embodiments, wherein the output end of the gate driving chip 320 is connected to the input end of the load circuit 310 .

[0118] Exemplarily, the load circuit 310 may include a device to be driven, and the device to be driven may be any controllable switch device, such as a power device such as an insulated gate bipolar transistor (IGBT) or a transistor such as a metal-oxide semiconductor field effect transistor (MOSFET), that is, the gate drive chip of the present application may be used to control the conduction and cutoff of a switch such as an IGBT or a MOSFET. For example, when the load circuit is an IGBT, the output end of the gate drive chip 320 is connected to the gate of the IGBT, and the electronic device may be any electronic product or device such as a household appliance (such as a variable frequency air conditioner), a television, a mobile phone, a tablet computer, a laptop computer, a netbook, a game console, a television, a VCD, a DVD, a navigator, a camera, a camcorder, a voice recorder, an MP3, an MP4, a PSP, etc., or an intermediate product having the above-mentioned gate drive chip, such as a mobile phone motherboard having the integrated circuit, or the electronic device 300 may also be a transportation device such as a vehicle.

[0119] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present invention thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as required by the appended claims.

[0120] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0121] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0122] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0123] Similarly, it should be understood that in order to streamline the present invention and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present invention should not be interpreted as reflecting the following intention: the claimed invention requires more features than the features explicitly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present invention.

[0124] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0125] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0126] The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) may be used in practice to implement some or all of the functions of some modules in the article analysis device according to an embodiment of the present invention. The present invention may also be implemented as a device program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such a signal may be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0127] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0128] The above is only a specific embodiment of the present invention or an explanation of a specific embodiment. The protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A driving current regulating circuit, characterized in that: The regulating circuit comprises: A detection circuit, used for detecting the operating state of the regulating circuit and outputting a first voltage signal; a power supply generating circuit, configured to output a second voltage signal, wherein a voltage value of the second voltage signal is adjusted by the first voltage signal; a gate driving circuit, configured to output a first current signal under the drive of the second voltage signal; Wherein, the output end of the detection circuit is connected to the control end of the power generation circuit, and the output end of the power generation circuit is connected to the input end of the gate driving module.

2. The drive current regulating circuit as claimed in claim 1, characterized in that: The power generation circuit includes at least one second switch circuit; The second switch circuit comprises: A first inverter; A second inverter, an input terminal of the second inverter being connected to an output terminal of the first inverter; a second switch element, wherein a control terminal of the second switch element is connected to an output terminal of the second inverter; a second resistor connected between the first end and the second end of the second switch element; The second switching circuit is configured to control the second switching element to be cut off and the second resistor to be turned on as a current path when the input voltage signal is greater than 5 volts after the input voltage signal is converted by the first inverter and the second inverter, so that the second voltage signal is determined based on the resistance value of the second resistor.

3. The drive current regulating circuit as claimed in claim 2, characterized in that: The first inverter is a threshold inverter.

4. The drive current regulating circuit as claimed in claim 2, characterized in that: The power generation circuit further includes a first switch circuit; The first switch circuit comprises: a first operational amplifier; a first resistor; A first switch element, wherein a first end of the first switch element is connected to an input power supply, a control end of the first switch element is connected to an output end of the first operational amplifier, and a second end of the first switch element is connected to a first end of the first resistor.

5. The drive current regulating circuit as claimed in claim 1, characterized in that: A control signal generating circuit is provided between the output end of the detection circuit and the control end of the power generating circuit. The control signal generating circuit comprises: a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series, and a connection end of the third resistor and the fourth resistor is connected to a control end of the power generation circuit; A second operational amplifier, wherein the non-inverting input terminal of the second operational amplifier is connected to the output terminal of the detection circuit, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is connected to the third resistor.

6. The driving current regulating circuit according to claim 5, characterized in that: The detection circuit includes at least one of an overcurrent protection circuit, an overtemperature protection circuit and a temperature detection circuit.

7. The drive current regulating circuit as claimed in claim 6, characterized in that: The detection circuit also includes: A first comparator, wherein an inverting input terminal of the first comparator is used to input a reference voltage signal, and a non-inverting input terminal of the first comparator is connected to an output terminal of at least one of the overcurrent protection circuit, the overtemperature protection circuit and the temperature detection circuit; A third switch element, wherein a control end of the third switch element is connected to the output end of the first comparator, a first end of the third switch element is connected to the non-inverting input end of the second operational amplifier, and a second end is grounded.

8. The driving current regulating circuit according to claim 1, characterized in that: The gate drive circuit comprises: a third inverter; Two fourth inverters, input terminals of the two fourth inverters are connected to the output terminal of the third inverter; a fourth switch element, wherein a first end of the fourth switch element is connected to an input power supply, and a control end of the fourth switch element is connected to output ends of the two fourth inverters; A fifth switch element, wherein a control end of the fifth switch element is connected to the output ends of the two fourth inverters, a first end of the fifth switch element is connected to the second end of the fourth switch element, and a second end of the fifth switch element is grounded.

9. A gate driver chip, characterized in that: The gate drive chip comprises a bandgap reference circuit and a drive current regulating circuit according to any one of claims 1 to 8; The bandgap reference circuit is used to generate a reference voltage with a zero temperature coefficient; The regulating circuit is used to output an adjustable current signal based on the reference voltage.

10. An electronic device, characterized in that: The electronic device comprises a load circuit and the gate driving chip according to claim 9, wherein an output end of the gate driving chip is connected to an input end of the load circuit.

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