Driving current regulating circuit, gate driving chip and electronic device

Abstract

The application provides a driving current adjusting circuit, a gate driving chip and an electronic device. The adjusting circuit comprises a detection circuit, a power supply generating circuit and a gate driving circuit. The detection circuit is used for detecting the running 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 by the first voltage signal. The gate driving circuit is used for outputting a first current signal under the driving of the second voltage signal. The output end of the detection circuit is connected with the control end of the power supply generating circuit, and the output end of the power supply generating circuit is connected with the input end of the gate driving module. The adjusting circuit can reduce the area of the circuit board, and reduce the design difficulty, production cost and use cost of the electronic product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of integrated circuits, and more particularly to a driving current adjusting circuit, a gate driving chip and an electronic device. BACKGROUND

[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 need to be used. This not only increases the area of a circuit board, but also increases the design difficulty of the electronic product, thereby greatly increasing the production cost and use cost of the electronic product. SUMMARY

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

[0004] According to a first aspect of the present application, a driving current adjusting circuit is provided, which comprises:

[0005] a detection circuit configured to detect the running state of the adjusting circuit and output a first voltage signal;

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

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

[0008] wherein the output end of the detection circuit is connected to the control end of the power supply generating circuit, and the output end of the power supply generating 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 supply generating circuit and the output port of the detection circuit, the output voltage of the power supply generating circuit, i.e. the input voltage of the gate driving circuit, can be changed, and thus the output current of the gate driving circuit can be changed, 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 cost and use cost of the electronic product, and reducing the design difficulty of the product and the production cost and use cost of the product.

[0010] In some embodiments of the present application, the power supply generating circuit comprises at least one second switch circuit.

[0011] The second switch circuit comprises:

[0012] a first inverter;

[0013] a second inverter, an input end of the second inverter being connected with an output end of the first inverter;

[0014] a second switch element, a control end of the second switch element being connected with an output end of the second inverter;

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

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

[0017] The technical solution has the following advantages or beneficial effects: the first inverter and the second inverter can realize filtering, and the one-to-one corresponding second switch element and the second resistor are arranged in the second switch circuit, whether the corresponding second resistor is connected to the second switch circuit is determined by whether the second switch element is turned on or turned off, so as to adjust the first voltage signal output by the power generation circuit.

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

[0019] The technical solution has the following advantages or beneficial effects: by arranging different threshold values, the output signal of the inverter at different input voltages can be controlled, and then the second resistor is turned on as a current path, so as to adjust 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 includes:

[0022] a first operational amplifier;

[0023] a first resistor;

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

[0025] The technical scheme has the following advantages or beneficial effects: when the non-inverting input end 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, so that the reference voltage of the reference is copied to the first end of the first resistor.

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

[0027] The control signal generation circuit comprises:

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

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

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

[0031] The third resistor and the fourth resistor constitute a voltage dividing resistor, and the second operational amplifier can output a follow-up signal of the voltage signal input from the inverting input end. The follow-up signal is divided by the third resistor and the fourth resistor, so that a control signal can be generated. The control signal is input into the power supply generation circuit, so that the voltage value of the second voltage signal output by the power supply generation circuit is adjusted.

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

[0033] The technical scheme has the following advantages or beneficial effects: since the overcurrent protection circuit, the overtemperature protection circuit or the temperature detection circuit is usually arranged in the drive current adjustment circuit, the output signal of the above-mentioned circuit is used as the input control signal, signal multiplexing is realized, the complexity of the circuit can be effectively reduced, and the cost of the circuit is reduced.

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

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

[0036] A third switch element, a control end of the third switch element being connected with an output end of the first comparator, a first end of the third switch element being connected with a same direction input end of the second operational amplifier, and a second end being grounded.

[0037] The technical scheme has the following advantages or beneficial effects: the output signal of the first comparator can be adjusted through the setting of the reference voltage signal, so that the driving signal of the third switch element can be obtained according to the different output signals of the overcurrent protection circuit, the overtemperature protection circuit and the temperature detection circuit, and the third switch element outputs the first voltage signal.

[0038] In some embodiments of the present application, the gate drive circuit comprises:

[0039] a third inverter;

[0040] two fourth inverters, input ends of the two fourth inverters being connected with an output end of the third inverter;

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

[0042] a fifth switch element, a control end of the fifth switch element being connected with the output ends of the two fourth inverters, a first end of the fifth switch element being connected with a second end of the fourth switch element, and a second end of the fifth switch element being grounded.

[0043] The technical scheme has the following advantages or beneficial effects: the third inverter and the fourth inverter can amplify the current signal, so as to effectively drive the fourth switch element and the fifth switch element; when the input signal is high, the fourth switch element and the fifth switch element are turned on to output the driving current; when the input signal is low, the driving current is stopped.

[0044] According to the second aspect of the present application, a gate drive chip is provided, which comprises a bandgap reference circuit and the above-mentioned driving current adjusting circuit.

[0045] The bandgap reference circuit is configured to generate a zero-temperature-coefficient reference voltage.

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

[0047] The technical scheme has the following advantages or beneficial effects: the gate drive chip comprises the above-mentioned driving current adjusting circuit, so that the size of the chip can be reduced, the design difficulty of the chip can be reduced, and the production cost and use cost of the chip can be reduced.

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

[0049] The technical scheme has the following advantages or beneficial effects: the electronic device comprises the gate drive chip, so that the volume of the electronic device is reduced, and the design difficulty, production cost and use cost of the electronic device are reduced.

[0050] The adjustment circuit of the driving current of the present application can change the output voltage of the power supply generation circuit, i.e. the input voltage of the gate drive circuit, by multiplexing the input port of the power supply generation circuit and the output port of the detection circuit, and then change the output current of the gate drive circuit, so as to effectively reduce the number of power tubes and the area of the circuit board, solve the problems of large circuit board area and high production cost and use cost of electronic products, and reduce the design difficulty, production cost and use cost of the product. BRIEF DESCRIPTION OF DRAWINGS

[0051] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of embodiments of the present application taken in conjunction with the accompanying drawings. The drawings provided in the present application are used to provide further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation of the present application. In the drawings, the same reference numerals generally represent the same components or steps.

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

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

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

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

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

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

[0058] Figure 7 is a schematic block diagram of the gate drive 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 objects, technical solutions and advantages of the present application more obvious, the following will describe the example embodiments according to the present application in detail with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the protection scope of the present application.

[0061] In view of the problem that in existing electronic products, different current signals are usually provided by multiple power semiconductor devices, which increases the design difficulty of the electronic products, thereby causing the production cost and use cost of the electronic products to increase substantially, the present application proposes a driving current adjusting circuit, a gate drive chip and an electronic device, which will be described in detail below.

[0062] First, with reference to Figure 1 , a driving current adjusting circuit 100 according to some embodiments of the present application will be described.

[0063] As shown in Figure 1 , the driving current adjusting circuit 100 comprises:

[0064] a detection circuit, configured to detect the running state of the adjusting circuit and output a first voltage signal;

[0065] a power supply generating circuit, configured to output a second voltage signal, and the voltage value of the second voltage signal is adjusted by the first voltage signal;

[0066] a gate drive circuit, configured to output a first current signal under the driving of the second voltage signal;

[0067] wherein, the output end of the detection circuit is connected with the control end of the power supply generating circuit, and the output end of the power supply generating circuit is connected with the input end of the gate drive module.

[0068] It should be noted that Figure 1 the components and structure of the driving current adjusting circuit 100 shown in

[0069] According to some embodiments of the present application, the power supply generating circuit comprises at least one second switch circuit.

[0070] Next, with reference to Figure 2A second switch circuit according to some embodiments of the present application will be described.

[0071] As shown in Figure 2 , the second switch circuit comprises:

[0072] a first inverter INV1;

[0073] a second inverter INV2, an input terminal of the second inverter INV2 being connected to an output terminal of the first inverter INV1;

[0074] a second switch element Q2, a control terminal of the second switch element Q2 being connected to an output terminal of the second inverter INV2;

[0075] a second resistor R2, the second resistor R2 being connected between a first terminal and a second terminal of the second switch element Q2;

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

[0077] Specifically, the second switch element Q2 can be a field effect transistor. Filtering can be achieved by the first inverter and the second inverter. A one-to-one corresponding second switch element Q2 and second resistor R2 are arranged in the second switch circuit, and whether the corresponding second resistor is connected to the second switch circuit is determined by the conduction or turn-off of the second switch element, so that the first voltage signal output by the power generation 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 the specific value of the threshold value is not limited in the present application.

[0080] It should be noted that when the power generation circuit comprises one more second switch circuits, the threshold values of the threshold inverters in each second switch circuit can be the same or different.

[0081] By setting different threshold values, the output signal of the inverter at different input voltages can be controlled, and then the second resistor is turned on as a current path, so as to adjust the voltage value of the second voltage signal.

[0082] Next, a power generation circuit according to some embodiments of the present application will be described with reference to Figure 3

[0083] As shown in Figure 3 , the power generation circuit further comprises a first switch circuit and a plurality of second switch circuits​

[0084] The number of second switching circuits can be selected according to actual conditions, and this application does not impose any restrictions. For the sake of simplifying the description process, the embodiments of this application use... Figure 3 The three second switching circuits shown are used as examples for illustration.

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

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

[0087] A first switching element Q1, a first resistor R1, and a plurality of second resistors are connected in series between the power supply VCC and ground. When there are multiple second resistors, they are designated as second resistors R21, R22, and R23, respectively. The second resistors R21, R22, and R23 are then connected in parallel with the second switching element Q2. Exemplarily, when there are multiple second resistors, the resistance value of each second resistor can be the same or different. Exemplarily, the number of first resistors R1 can also be multiple, and the number of first resistors R1 can be selected according to the actual situation. This application does not impose any restrictions; however, this embodiment uses one first resistor R1 as an example for illustration.

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

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

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

[0091] Next, refer to Figure 4 This application describes a control signal generation circuit according to some embodiments.

[0092] like Figure 4 As shown, the control signal generation circuit includes a third resistor R3 and a fourth resistor R4, which are connected in series. The connection terminals of the third resistor R3 and the fourth resistor R4 are connected to the control terminal of the power generation circuit.

[0093] The control signal generation 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 a third resistor.

[0094] The voltage signal FO generates a voltage follower signal FO' through the second operational amplifier A2. FO' is divided by resistors to generate a control signal CON. The CON signal is input to the power generation circuit of the module.

[0095] The control signal generation circuit of this embodiment can output different voltage signals to meet the input requirements of the control signal of the power generation circuit.

[0096] According to some embodiments of this 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, overtemperature protection circuit, and temperature detection circuit can use existing circuits. The overcurrent protection circuit, overtemperature protection circuit, and temperature detection circuit are used to output the detection voltage signal of the detection circuit.

[0098] Since drive current regulation circuits typically include overcurrent protection circuits, overtemperature protection circuits, or temperature detection circuits, using the output signals of these circuits as input control signals to achieve signal multiplexing can effectively reduce circuit complexity and cost.

[0099] Next, refer to Figure 5 This application describes a circuit for adjusting the drive current according to some embodiments.

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

[0101] The detection circuit includes an overcurrent protection circuit, a first comparator C1, and a third switching 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 connected to the input terminal of the logic control circuit and the control terminal of the third switching element Q3, respectively.

[0103] The first terminal of the third switching element Q3 is connected to the second terminal of the fifth resistor R5, and the first terminal of the fifth resistor R5 is connected to the input power supply VCC.

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

[0105] In this embodiment, the logic control circuit can be a controller, and the controller can adopt various controllers commonly used by those skilled in the art, such as single-chip microcomputer controllers, micro control units, and programmable logic controllers. For example, the signal generator SG receives control instructions from the controller and outputs responsive control signals according to the control instructions to control the second switching element.

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

[0107] In this embodiment, the FO port signal is multiplexed as a control signal CON of the power supply generating circuit, and the control signal controls the selection of internal resistors of the power supply generating circuit, thereby changing the low-voltage power supply inside the chip.

[0108] Next, the gate drive circuit according to some embodiments of the present application will be described with reference to Figure 6

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

[0110] ​The input end of the two fourth inverters INV4 is connected with the output end of the third inverter INV3; the first end of the fourth switch element Q4 is connected with the input power supply VCC, the control end of the fourth switch element Q4 is connected with the output end of the two fourth inverters INV4; the control end of the fifth switch element Q5 is connected with the output end of the two fourth inverters INV4, the first end of the fifth switch element is connected with 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 in parallel can amplify the input current signal, thereby meeting the current requirement of driving the fourth switch element Q4 and the fifth switch element Q5.

[0112] It should be noted that the gate drive circuit further comprises a plurality of fifth inverters and a plurality of sixth inverters, thereby further increasing the current signal.

[0113] Another aspect of the present application, as shown in Figure 7 Further provided is a gate drive chip 200 comprising a bandgap reference circuit 210 and the drive current adjusting circuit 220 according to any one of the above embodiments.

[0114] The bandgap reference circuit 210 is configured to generate a zero-temperature-coefficient reference voltage.

[0115] The adjusting circuit 220 is configured to output an adjustable current signal based on the reference voltage.

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

[0117] Another aspect of the present application, as shown in Figure 8 Further provided is an electronic device 300 comprising a load circuit 310 and the gate drive chip 320 according to any one of the above embodiments, wherein the output end of the gate drive chip 320 is connected with the input end of the load circuit 310.

[0118] Exemplarily, the load circuit 310 can include a to-be-driven device, which can be any controllable switching device, such as a power device of an Insulated Gate Bipolar Transistor (IGBT) or a transistor of a metal-oxide semiconductor FET (MOSFET), i.e., the gate drive chip of the present application can be used to control the conduction and cutoff of a switching tube 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 can be any electronic product or equipment such as a household appliance (such as a variable frequency air conditioner), a television, a mobile phone, a tablet computer, a notebook computer, a netbook, a game console, a television, a VCD, a DVD, a navigator, a camera, a video camera, a recording pen, an MP3, an MP4, a PSP, or an intermediate product having the gate drive chip, such as a mobile phone mainboard having the integrated circuit, or the electronic device 300 can also be a vehicle or other transportation equipment.

[0119] Although the example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the example embodiments are merely exemplary and are not intended to limit the scope of the present application. Those of ordinary skill in the art can make various changes and modifications without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed in the appended claims.

[0120] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be realized in electronic hardware, or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those of ordinary skill in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0121] In several embodiments provided in the present 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 merely illustrative, for example, the division of units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be omitted or not executed.

[0122] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

[0123] Similarly, it is to be understood that the phraseology or terminology employed herein, and not otherwise specified, is for the purpose of description only and not of limitation. Rather, the use of such terms is merely for providing one skilled in the art with a technical conception of the inventive subject matter. The foregoing detailed description has been presented for purposes of clarity of understanding only. It is most

[0124] Those skilled in the art recognize that all features disclosed in this specification, including any accompanying claims, abstract, and drawings, can be material to the full scope of the application. Thus, unless otherwise expressly stated, any feature disclosed herein is an essential feature of the application and cannot be omitted without

[0125] Furthermore, to the extent that the terms specific or certain are used in this specification in reference to a particular feature then, such terms can be construed either as set forth above, or as meaning one or more specific embodiments, as the context can dictate. Also, to the extent that the term comprises is used in the context of features, structures, items or processes in this specification, such term is intended to mean that the features, structures, items or processes comprise the recited elements, but not excluding other features, structures, items or processes. Furthermore, to the extent that the term comprising is used in the context of features, structures, items or processes in this specification, such term is intended to mean the same as the term including. Furthermore, to the extent that the term having is used in the context of features, structures, items or processes in this specification, such term is intended to mean the same as the term comprising. Furthermore, to the extent that the term comprising is used in the context of features, structures, items or processes in this specification, such term is intended to mean the same as the term including.

[0126] The various component embodiments of the present application can be implemented in hardware, or as software modules running in one or more processors, or in combinations thereof. As will be appreciated by one skilled in the art, a microprocessor or digital signal processor (DSP) can be used in practice to implement some or all of the functionality of some of the modules in the item analysis apparatus according to embodiments of the present application. The present application can also be implemented as an apparatus program (e.g., a computer program and computer program product) for performing part or all of the methods described herein. Such a program implementing the present application can be stored on a computer readable medium, or can have one or more signals. Such signals can be downloaded from an Internet website, or provided on a carrier medium, or in any other form.

[0127] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that one skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word 'comprising' does not exclude the presence of elements or steps other than those listed in a claim. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a unitary claim, several of the devices, apparatuses or means, if any, can be implemented by one and the same item of hardware. The use of the words 'first','second' and 'third', etc. do not imply any order but rather are used for naming purposes only. Further, the word 'comprise' or 'comprising' or 'including' or 'including' or 'having' should not be construed as meaning that the enumerated elements are the only ones that can be present in the composition or process.

[0128] The above description is only specific embodiments of the present application or specific explanations of specific embodiments, and the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, and all of them should be covered within the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A drive current regulating circuit, characterized by, The adjusting circuit comprises: a detection circuit for detecting the operating state of the adjusting circuit and outputting a first voltage signal; a power supply generating circuit for outputting a second voltage signal, the voltage value of the second voltage signal being adjusted by the first voltage signal; a gate driving circuit 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 generating circuit, and the output end of the power supply generating circuit is connected with the input end of the gate driving circuit; a control signal generating circuit is arranged between the output end of the detection circuit and the control end of the power supply 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 the connection end of the third resistor and the fourth resistor is connected with the control end of the power supply generating circuit; a second operational amplifier, the same direction input end of the second operational amplifier is connected with the output end of the detection circuit, the opposite phase input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the third resistor; the detection circuit comprises at least one of an overcurrent protection circuit, an overtemperature protection circuit and a temperature detection circuit; the detection circuit further comprises: a first comparator, the opposite phase input end of the first comparator is used for inputting a reference voltage signal, and the same direction input end of the first comparator is connected with the output end of at least one of the overcurrent protection circuit, the overtemperature protection circuit and the temperature detection circuit; a third switch element, the control end of the third switch element is connected with the output end of the first comparator, the first end of the third switch element is connected with the same direction input end of the second operational amplifier, and the second end of the third switch element is grounded.

2. The drive current regulating circuit as recited in claim 1, wherein, the power supply generating circuit comprises at least one second switch circuit; the second switch circuit comprises: a first inverter; a second inverter, the input end of the second inverter is connected with the output end of the first inverter; a second switch element, the control end of the second switch element is connected with the output end of the second inverter; a second resistor, the second resistor is connected between the first end and the second end of the second switch element; the second switch circuit is configured to, when the input voltage signal is greater than 5 volts, control the second switch element to be cut off after the input voltage signal is converted through the first inverter and the second inverter, and the second resistor is turned on as a current path to make the second voltage signal be determined based on the resistance value of the second resistor.

3. The regulating circuit for driving current as defined in claim 2, wherein, The first inverter is a threshold inverter.

4. The regulating circuit for driving current as defined in claim 2, wherein, the power supply generating circuit further comprises a first switch circuit; the first switch circuit comprises: a first operational amplifier; a first resistor; a first switch element, the first end of the first switch element is connected with an input power supply, the control end of the first switch element is connected with the output end of the first operational amplifier, and the second end of the first switch element is connected with the first end of the first resistor.

5. The drive current regulating circuit of claim 1, wherein, the gate driving circuit comprises: a third inverter; two fourth inverters, inputs of the two fourth inverters are connected with the output of the third inverter; a fourth switch element, a first end of the fourth switch element is connected with an input power supply, control ends of the fourth switch element are connected with outputs of the two fourth inverters; a fifth switch element, a control end of the fifth switch element is connected with the outputs of the two fourth inverters, a first end of the fifth switch element is connected with a second end of the fourth switch element, and a second end of the fifth switch element is grounded.

6. A gate drive chip, characterized by The gate drive chip comprises a bandgap reference circuit and the adjusting circuit for driving current according to any one of claims 1 to 5; The bandgap reference circuit is configured to generate a reference voltage with zero temperature coefficient. The adjusting circuit is configured to output an adjustable current signal based on the reference voltage.

7. An electronic device, comprising: The electronic device comprises a load circuit and the gate drive chip according to claim 6, wherein an output of the gate drive chip is connected with an input of the load circuit.

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