Constant current control circuit, method, device, equipment, medium and power supply

Abstract

The present application discloses a constant current control circuit, method, device, equipment, medium and power supply, which utilize a first transistor to control a MOS tube, thereby realizing constant current control, and can realize high-speed dynamic response output based on the fast switching characteristic of the transistor, and utilize a second transistor paired with the first transistor and a current adjustment unit to eliminate the error introduced by the first transistor, thereby maintaining a high output accuracy while improving the high-speed dynamic response output.

Description

Technical Field

[0001] The present application relates to the field of power supplies, and in particular to a constant current control circuit, method, device, equipment, medium and power supply. Background Art

[0002] All major manufacturers need to use power supply equipment, especially constant current linear power supply, in the process of equipment production, debugging and testing. In the related technology, the realization of constant current linear power supply mainly relies on operational amplifier to design constant current control circuit. However, in this way, although higher precision can be achieved, it has the disadvantage of slow dynamic response, which leads to the problem of overcharging when the current changes suddenly. Summary of the invention

[0003] The present application aims to propose a constant current control circuit, method, device, equipment, medium and power supply, which can achieve constant current output with high precision and high dynamic response.

[0004] According to the first aspect of the present application, a constant current control circuit includes:

[0005] The power tube, whose drain is used to access the power supply voltage;

[0006] a first triode, whose base is connected to the source of the power tube, and whose collector is connected to the gate of the power tube, and whose base is also used to access the working voltage;

[0007] A current limiting resistor is connected between the source of the power tube and the ground wire, and one end of the current limiting resistor connected to the ground wire is used as a constant current output end;

[0008] A second triode, whose base is connected to the collector, the collector of the second triode is used to access the working voltage, and the emitter is connected to the ground wire; the second triode and the first triode are paired triodes;

[0009] The current adjustment unit has an adjustable input terminal, a deviation input terminal and an adjustment output terminal, wherein the adjustable input terminal is used to receive a constant current adjustment signal, the deviation input terminal is connected to the base of the second triode, the adjustment output terminal is connected to the emitter of the first triode, and the adjustment output terminal is used to output a voltage difference between a voltage between the collector and the base of the second triode and the constant current adjustment signal.

[0010] According to a second aspect of the present application, a constant current control circuit control method is applied to the above-mentioned constant current control circuit, and the constant current control circuit control method includes:

[0011] Get constant current output control parameters;

[0012] generating a constant current adjustment signal corresponding to the constant current output control parameter;

[0013] The constant current adjustment signal is output to the adjustable input terminal of the current adjustment unit, so that the constant current control circuit outputs an electrical signal corresponding to the constant current output control parameter through the constant current output terminal.

[0014] According to a third aspect of the present application, a constant current control circuit control device is applied to the above-mentioned constant current control circuit, and the constant current control circuit control device includes:

[0015] A control parameter acquisition module is used to obtain constant current output control parameters;

[0016] An adjustment signal generating module, used for generating a constant current adjustment signal corresponding to the constant current output control parameter;

[0017] The adjustment signal output module is used to output the constant current adjustment signal to the adjustable input end of the current adjustment unit, so that the constant current control circuit outputs an electrical signal corresponding to the constant current output control parameter through the constant current output end.

[0018] According to a fourth aspect of the present application, the electronic device comprises: a processor and a memory storing computer program instructions;

[0019] When the processor executes the computer program instructions, the constant current control circuit control method of the second aspect embodiment is implemented.

[0020] According to the computer-readable storage medium of the fifth aspect embodiment of the present application, computer executable instructions are stored, and the computer executable instructions are used to execute the constant current control circuit control method as described in the second aspect embodiment above.

[0021] The power supply according to the present application includes the constant current control circuit as described above.

[0022] The constant current control circuit, method, device, equipment, medium and power supply of the embodiments of the present application use a first transistor to control the MOS tube, thereby realizing constant current control, and can realize high-speed dynamic response output based on the fast switching characteristic of the transistor, and use a second transistor paired with the first transistor and a current adjustment unit to eliminate the error introduced by the first transistor, thereby maintaining a high output accuracy while improving the high-speed dynamic response output.

[0023] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 A circuit diagram of a constant current control circuit provided in an embodiment of the present application;

[0026] Figure 2 A flow chart of a constant current control circuit control method provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of a constant current control circuit control device provided in an embodiment of the present application.

[0028] Reference numerals:

[0029] The current adjustment unit 110 . DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0031] In the description of this application, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present application, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In the description of this application, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above terms in this application based on the specific content of the technical solution.

[0034] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments.

[0035] See also Figure 1 As shown, a constant current control circuit provided by an embodiment of the present application includes:

[0036] The power tube Q3, whose drain is used to access the power supply voltage VIN+;

[0037] A first transistor Q1, whose base is connected to the source of the power tube Q3, whose collector is connected to the gate of the power tube Q3, and whose base is also used to access the working voltage VCC;

[0038] The current limiting resistor R_ocp is connected between the source of the power tube Q3 and the ground line, and one end of the current limiting resistor R_ocp connected to the ground line is used as the constant current output terminal OUT+;

[0039] A second transistor Q2, whose base is connected to the collector, the collector of the second transistor Q2 is used to access the working voltage VCC, and the emitter is connected to the ground line; the second transistor Q2 and the first transistor Q1 are paired transistors;

[0040] The current adjustment unit 110 has an adjustable input terminal, a deviation input terminal and an adjustment output terminal. The adjustable input terminal is used to access the constant current adjustment signal V_Iset, the deviation input terminal is connected to the base of the second transistor Q2, the adjustment output terminal is connected to the emitter of the first transistor Q1, and the adjustment output terminal is used to output the voltage difference between the voltage between the collector and the base of the second transistor Q2 and the constant current adjustment signal V_Iset.

[0041] In the embodiment of the present application, the first transistor Q1 is used to control the MOS tube, thereby realizing constant current control. At the same time, high-speed dynamic response output can be realized based on the fast switching characteristic of the transistor. The second transistor Q2 paired with the first transistor Q1 and the current adjustment unit 110 can be used to eliminate the error introduced by the first transistor Q1, thereby maintaining a higher output accuracy while improving the high-speed dynamic response output.

[0042] The power tube Q3 may be a MOS tube (Metal Oxide Semiconductor Field Effect Transistor). In the embodiment of the present application, the MOS tube operates in a linear working area, and the change in the base voltage of the transistor can be used to adjust the conduction amount of the MOS tube, thereby adjusting the current value during constant current output.

[0043] The first transistor Q1 and the second transistor Q2 are paired transistors. It should be noted that the paired transistors are selected after pairing, so that the selected first transistor Q1 and the second transistor Q2 can maintain high consistency in performance and parameters, thereby improving the accuracy of elimination when the voltage between the base and the collector of the first transistor Q1 is eliminated by using the voltage between the base and the collector of the second transistor Q2.

[0044] The above-mentioned current adjustment unit 110 can directly output the voltage difference between the voltage between the collector and the base of the second transistor Q2 and the constant current adjustment signal V_Iset. After the voltage difference is output to the emitter of the first transistor Q1, the voltage error between the base and the collector of the second transistor Q2 can be directly eliminated, so that the base voltage of the first transistor Q1 can be kept consistent with the constant current adjustment signal V_Iset as much as possible.

[0045] In some embodiments, the current adjustment unit 110 includes a proportional differential circuit, which is constructed based on the operational amplifier U1. The positive input terminal of the proportional differential circuit is used to access the constant current adjustment signal V_Iset, the negative input terminal is connected to the base of the second transistor Q2, and the output terminal is connected to the emitter of the first transistor Q1.

[0046] In this embodiment, a proportional differential circuit is constructed based on the operational amplifier U1, and the proportional differential circuit can be used to quickly output the voltage difference between the voltage between the collector and the base of the second transistor Q2 and the constant current adjustment signal V_Iset.

[0047] In some implementations, the current adjustment unit 110 may also use other circuits with subtraction capabilities, as long as it can quickly complete the operation of the voltage difference between the voltage between the collector and the base of the second transistor Q2 and the constant current adjustment signal V_Iset.

[0048] In some implementations, the ratiometric differential circuit includes:

[0049] An operational amplifier U1, whose output terminal is connected to the emitter of the first transistor Q1;

[0050] A first resistor R8, one end of which is connected to the positive input terminal of the operational amplifier U1, and the other end of which is used to receive the constant current adjustment signal V_Iset;

[0051] A second resistor R9 is connected between the positive input terminal of the operational amplifier U1 and the ground line;

[0052] A third resistor R7 is connected between the negative input terminal of the operational amplifier U1 and the base of the second transistor Q2;

[0053] The fourth resistor R6 is connected between the negative input terminal and the output terminal of the operational amplifier U1; the ratio of the first resistor R8 to the second resistor R9 is the same as the ratio of the third resistor R7 to the fourth resistor R6.

[0054] In this embodiment, a differential circuit is constructed based on the operational amplifier U1, the first resistor R8, the second resistor R9, the third resistor R7 and the fourth resistor R6, and by setting the ratio of the first resistor R8 to the second resistor R9 and the ratio of the third resistor R7 to the fourth resistor R6, the proportional differential circuit can accurately and quickly output the voltage difference between the voltage between the collector and the base of the second transistor Q2 and the constant current adjustment signal V_Iset.

[0055] In some embodiments, the first resistor R8 , the second resistor R9 , the third resistor R7 , and the fourth resistor R6 have the same resistance value.

[0056] The first resistor R8, the second resistor R9, the third resistor R7 and the fourth resistor R6 have the same resistance value, which can better make the first resistor R8, the second resistor R9, the third resistor R7 and the fourth resistor R6 have closer characteristics, thereby reducing the influence of factors such as temperature drift.

[0057] In some implementations, the first resistor R8 , the second resistor R9 , the third resistor R7 , and the fourth resistor R6 are resistors of the same type.

[0058] In this embodiment, by using the same model of the first resistor R8, the second resistor R9, the third resistor R7 and the fourth resistor R6, the first resistor R8, the second resistor R9, the third resistor R7 and the fourth resistor R6 can maintain the same resistance value while maintaining highly consistent characteristics, so that even if the constant current control circuit runs for a long time, it can effectively eliminate the influence of many environmental interference factors such as temperature drift.

[0059] In order to better describe the working principle of the constant current control circuit of the embodiment of the present application, based on the above implementation mode, reference is made to Figure 1 , for further description.

[0060] First, the current flowing through the base of the first transistor Q1 is not large, and the resistor R4 can be selected to have a smaller resistance, so the influence of the voltage drop of the resistor R4 can be ignored, thus obtaining: The voltage at point A is approximately equal to the voltage at point B ,Right now:

[0061] .

[0062] Secondly, the resistor R12 is connected to the base and collector of the second transistor Q2. Let V_F be the voltage at point F. According to the inherent characteristics of the transistor, V_F is exactly equal to the voltage V_Q2be between the collector and base of the second transistor.

[0063] At the same time, the first resistor R8, the second resistor R9, the third resistor R7, and the fourth resistor R6 have equal resistance values ​​and form a proportional differential amplifier circuit with the operational amplifier U1, and thus:

[0064] ;

[0065] In the above formula, is the voltage of the emitter of the first transistor Q1, It is the setting voltage corresponding to the constant current adjustment signal.

[0066] Finally, considering the voltage between the base and emitter of the first transistor Q1 , thus determining:

[0067] ;

[0068] And because the first transistor Q1 and the second transistor Q2 are paired transistors, it can be determined that , thus we can get:

[0069] ;

[0070] Finally, we can get:

[0071] ;

[0072] In the above formula, is the current limiting resistor.

[0073] In summary, the required constant current source can be output with high dynamic response and high precision by only adjusting the constant current adjustment signal V_Iset.

[0074] See also Figure 2 As shown, Figure 2 : is a flow chart of a constant current control circuit control method provided by an embodiment of the present application, and the constant current control circuit control method includes:

[0075] Get constant current output control parameters;

[0076] Generate a constant current adjustment signal V_Iset corresponding to the constant current output control parameter;

[0077] The constant current adjustment signal V_Iset is output to the adjustable input terminal of the current adjustment unit 110, so that the constant current control circuit outputs an electrical signal corresponding to the constant current output control parameter through the constant current output terminal OUT+.

[0078] The constant current control circuit control method in the embodiment of the present application is implemented based on the above-mentioned constant current control circuit. The constant current control circuit has been described in detail above and will not be repeated here.

[0079] The constant current output control parameters can be obtained by inputting them through an operator on a human-machine interaction unit of the power supply, or by inputting them through an external device such as a host computer or a terminal.

[0080] The above constant current output control parameter can be a single parameter, that is, only one constant current adjustment is completed, or it can be a group of parameters, which can automatically and continuously complete multiple constant current adjustments according to the time interval between the set parameters.

[0081] The above constant current adjustment signal V_Iset can be understood as a voltage signal. Different constant current output control parameters correspond to different output currents, and thus the corresponding adjustment can be completed by setting different voltage signals. Figure 1 When the constant current adjustment signal V_Iset corresponds to different voltages, the base voltage of the first transistor Q1 will be different, thereby adjusting the opening of the power tube Q3 and further achieving output of different constant current values.

[0082] The above constant current adjustment signal V_Iset can be understood as being output by the digital-to-analog conversion module.

[0083] The constant current control circuit control method in the embodiment of the present application is implemented based on the above-mentioned constant current control circuit control device. The constant current control circuit control device has been described in detail above and will not be repeated here.

[0084] refer to Figure 3 The embodiment of the present application further provides a constant current control circuit control device, the constant current control circuit control device comprising:

[0085] A control parameter acquisition module is used to obtain constant current output control parameters;

[0086] An adjustment signal generating module, used for generating a constant current adjustment signal V_Iset corresponding to the constant current output control parameter;

[0087] The adjustment signal output module is used to output the constant current adjustment signal V_Iset to the adjustable input terminal of the current adjustment unit 110, so that the constant current control circuit outputs an electrical signal corresponding to the constant current output control parameter through the constant current output terminal OUT+.

[0088] The embodiment of the present application further provides a power supply, including the above-mentioned constant current control circuit. Because the above-mentioned constant current control circuit is applied, the beneficial effects brought by the above-mentioned constant current control circuit are obtained, which will not be described in detail here.

[0089] The constant current control circuit control device in the embodiment of the present application can be an electronic device, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or it can be other devices other than a terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a car-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, a super mobile personal computer (Ultra-mobile per Sonal Computer, UMPC), a netbook or a personal digital assistant (per Sonal digital asSiStant, PDA), etc., and can also be a server, a network attached storage (Network AttaChed Storage, NAS), a personal computer (per Sonal Computer, PC), a television (teleViSion, tV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0090] The embodiment of the present application also provides an electronic device, including: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the constant current control circuit control method as described above is implemented. The source meter provided in the embodiment of the present application can implement each process implemented in the embodiment of the constant current control circuit control method described above, and achieve the same beneficial effects. To avoid repetition, it will not be repeated here.

[0091] An embodiment of the present application also provides a computer-readable storage medium, which stores computer-executable instructions. The computer-executable instructions are executed by a processor or a control module, so that the above-mentioned processor can execute the constant current control circuit control method in the above-mentioned embodiment, for example, execute the method described above.

[0092] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0093] The functional blocks shown in the above structural block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0094] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0095] Aspects of the present disclosure are described above with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0096] The above are only specific implementation methods of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A constant current control circuit, characterized in that: include: The power tube, whose drain is used to access the power supply voltage; A first triode, whose base is connected to the source of the power tube, and whose collector is connected to the gate of the power tube, and the base of the first triode is also used to access the working voltage; A current limiting resistor is connected between the source of the power tube and the ground wire, and one end of the current limiting resistor connected to the ground wire is used as a constant current output end; A second triode, whose base is connected to the collector, the collector of the second triode is used to access the working voltage, and the emitter is connected to the ground wire; the second triode and the first triode are paired triodes; A current adjustment unit, comprising an adjustable input terminal, a deviation input terminal and an adjustment output terminal, wherein the adjustable input terminal is used to receive a constant current adjustment signal, the deviation input terminal is connected to the base of the second triode, the adjustment output terminal is connected to the emitter of the first triode, and the adjustment output terminal is used to output a voltage difference between a voltage between the collector and the base of the second triode and the constant current adjustment signal; The current adjustment unit includes a proportional differential circuit, which is constructed based on an operational amplifier. The positive input end of the proportional differential circuit is used to access the constant current adjustment signal, the negative input end is connected to the base of the second transistor, and the output end is connected to the emitter of the first transistor.

2. The constant current control circuit according to claim 1, characterized in that: The proportional differential circuit comprises: The operational amplifier, an output end of which is connected to the emitter of the first transistor; A first resistor, one end of which is connected to the positive input terminal of the operational amplifier, and the other end of which is used to receive the constant current adjustment signal; a second resistor connected between the positive input terminal of the operational amplifier and the ground line; a third resistor connected between the negative input terminal of the operational amplifier and the base of the second transistor; A fourth resistor is connected between the negative input terminal and the output terminal of the operational amplifier; a ratio of the first resistor to the second resistor is the same as a ratio of the third resistor to the fourth resistor.

3. The constant current control circuit according to claim 2, characterized in that: The first resistor, the second resistor, the third resistor and the fourth resistor have the same resistance value.

4. The constant current control circuit according to claim 3, characterized in that: The first resistor, the second resistor, the third resistor and the fourth resistor are resistors of the same type.

5. A constant current control circuit control method, characterized in that: Applied to the constant current control circuit according to any one of claims 1 to 4, the constant current control circuit control method comprises: Get constant current output control parameters; generating a constant current adjustment signal corresponding to the constant current output control parameter; The constant current adjustment signal is output to the adjustable input terminal of the current adjustment unit, so that the constant current control circuit outputs an electrical signal corresponding to the constant current output control parameter through the constant current output terminal.

6. A constant current control circuit control device, characterized in that: Applicable to the constant current control circuit according to any one of claims 1 to 4, the constant current control circuit control device comprises: A control parameter acquisition module is used to obtain constant current output control parameters; An adjustment signal generating module, used for generating a constant current adjustment signal corresponding to the constant current output control parameter; The adjustment signal output module is used to output the constant current adjustment signal to the adjustable input end of the current adjustment unit, so that the constant current control circuit outputs an electrical signal corresponding to the constant current output control parameter through the constant current output end.

7. An electronic device, characterized in that: The electronic device comprises a processor and a memory storing computer program instructions; When the processor executes the computer program, the constant current control circuit control method according to claim 5 is implemented.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the constant current control circuit control method as claimed in claim 5.

9. A power supply, characterized in that: Comprising the constant current control circuit as described in any one of claims 1 to 4.

Images