A voltage and current dual-loop control type power supply system

Abstract

The application relates to the technical field of power supply, and particularly discloses a voltage and current double-loop control type power supply system which comprises an input port, a control chip, an output port, a first MOS tube, a second MOS tube, an inductor and a regulation and control module; wherein the control chip and the regulation and control module are connected in parallel with a current regulation loop for controlling the actual output current of the output port and a voltage regulation loop for controlling the actual output voltage of the output port. The voltage and current double-loop control type power supply system can effectively solve the problem that the existing power supply cannot have both constant current output and constant voltage output.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, and in particular to a voltage and current dual-loop control power supply system. Background Technology

[0002] Figure 1 This is a circuit diagram of a common power supply, which includes an input port 1, a control chip 2, an output port 3, a first MOSFET 4, a second MOSFET 5, an inductor 6, and a microcontroller unit 703;

[0003] in,

[0004] The drain (D) of the first MOSFET 4 is connected to the input port 1, the gate (G) of the first MOSFET 4 is connected to the control chip 2, and the source (S) of the first MOSFET 4 is connected to the output port 3 through the inductor 6.

[0005] The drain of the second MOSFET 5 is connected to the output port 3 through the inductor 6, the gate of the second MOSFET 5 is connected to the control chip 2, and the source of the second MOSFET 5 is grounded.

[0006] The microcontroller unit 703 is connected to the control chip 2 and is used to generate a square wave signal with a specific duty cycle to the control chip 2, thereby controlling the switching cycle of the first MOS transistor 4.

[0007] After inputting voltage to input port 1, control chip 2 controls the switching cycle of the first MOSFET 4 according to the square wave signal, so that output port 3 can achieve constant voltage output.

[0008] The problem with existing power supplies is that they can only provide constant voltage output and do not also have constant current output capabilities. Therefore, it is necessary to improve existing power supplies to solve the problem of not being able to provide both constant current and constant voltage output functions. Summary of the Invention

[0009] One objective of this invention is to provide a voltage and current dual-loop control power supply system that can effectively solve the problem that existing power supplies cannot simultaneously perform both constant current output and constant voltage output functions.

[0010] To achieve the above objectives, the present invention provides a voltage and current dual-loop controlled power supply system, including an input port, a control chip, an output port, a first MOSFET, a second MOSFET, an inductor, and a control module constituting the power supply.

[0011] The control chip and the regulation module are connected in parallel with a current regulation loop for controlling the actual output current of the output port and a voltage regulation loop for controlling the actual output voltage of the output port.

[0012] Optional,

[0013] The drain (D) of the first MOSFET is connected to the input port, the gate (G) of the first MOSFET is connected to the control chip, and the source (S) of the first MOSFET is connected to the output port through the inductor.

[0014] The drain (D) of the second MOSFET is connected to the output port through the inductor, the gate (G) of the second MOSFET is connected to the control chip, and the source (S) of the second MOSFET is grounded.

[0015] Optionally, the control module includes:

[0016] The acquisition unit is used to acquire the actual output current or the actual output voltage;

[0017] The setting unit is used to set the target output current or target output voltage of the output port;

[0018] A microcontroller unit is connected to both the acquisition unit and the setting unit.

[0019] Optionally, both the current regulation loop and the voltage regulation loop include a first comparator, a second comparator, and a third comparator;

[0020] in,

[0021] The positive input terminal of the first comparator is connected to the output terminal of the second comparator, and the negative input terminal of the first comparator is connected to the positive input terminal of the third comparator.

[0022] Both the positive and negative input terminals of the second comparator are connected to the setting unit;

[0023] The output terminal of the third comparator is connected to the negative terminal of the input terminal of the third comparator, and the output terminal of the third comparator is connected to the acquisition unit.

[0024] Optionally, the current regulation loop may further include a current-side resistor connected between the inductor and the output port.

[0025] Optionally, the current regulation loop further includes a fourth comparator;

[0026] The positive input terminal of the fourth comparator is connected to the end of the current-side resistor closest to the inductor;

[0027] The negative terminal of the input of the fourth comparator is connected to the end of the current-side resistor near the output port;

[0028] The output terminal of the fourth comparator is connected to the positive input terminal of the third comparator in the current regulation loop.

[0029] Optionally, the voltage regulation loop further includes a voltage-side resistor;

[0030] The positive input terminal of the third comparator in the voltage regulation loop is connected to the end of the inductor closest to the current-side resistor via the voltage-side resistor.

[0031] Optionally, the negative terminal of the input of the first comparator is connected to the output of the first comparator through a first capacitor.

[0032] Optionally, the negative terminal of the input of the first comparator is also connected to the output of the first comparator through a second capacitor and a voltage divider resistor connected in series.

[0033] Optionally, a clamping diode is provided between the output of the first comparator and the control chip.

[0034] The beneficial effects of the present invention are as follows: It provides a voltage and current dual-loop control power supply system, wherein a current regulation loop for controlling the actual output current of the output port and a voltage regulation loop for controlling the actual output voltage of the output port are connected in parallel in the power supply.

[0035] When different regulation loops are used for feedback regulation, the output port can be controlled to output constant current or constant voltage.

[0036] Therefore, the voltage and current dual-loop control power supply system provided in this embodiment can effectively solve the problem that existing power supplies cannot simultaneously perform both constant current output and constant voltage output functions. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A circuit diagram of an existing power supply provided for the background art;

[0039] Figure 2 The circuit diagram of the voltage and current dual-loop controlled power supply system provided for the embodiment is shown.

[0040] In the picture:

[0041] 1. Input port;

[0042] 2. Control chip;

[0043] 3. Output port;

[0044] 4. First MOSFET;

[0045] 5. Second MOSFET;

[0046] 6. Inductance;

[0047] 7. Control module; 701. Acquisition unit; 702. Setting unit; 703. Micro-control unit;

[0048] 8a. Current regulation loop; 8b. Voltage regulation loop;

[0049] 801. First comparator; 802. Second comparator; 803. Third comparator;

[0050] 804. Current-side resistor; 805. Fourth comparator;

[0051] 806. Voltage-side resistor;

[0052] 807. First capacitor; 808. Second capacitor; 809. Voltage divider resistor;

[0053] 9. Clamping diode. Detailed Implementation

[0054] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0055] In the description of this invention, it should be understood that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present simultaneously. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be an intermediate component present simultaneously.

[0056] Furthermore, terms such as “long,” “short,” “inner,” and “outer” indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the purpose of describing the present invention and are not intended to indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientational configuration. Therefore, they should not be construed as limitations of the present invention.

[0057] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0058] This invention provides a voltage and current dual-loop controlled power supply system, suitable for working scenarios with constant current output or constant voltage output. It can effectively solve the problem that existing power supplies cannot have both constant current output and constant voltage output functions, and is conducive to meeting diverse power supply needs.

[0059] See Figure 2 In this embodiment, the voltage and current dual-loop controlled power supply system includes an input port 1, a control chip 2, an output port 3, a first MOSFET 4, a second MOSFET 5, an inductor 6, and a control module 7 constituting the power supply.

[0060] As an alternative way to construct a power supply, the drain (D) of the first MOSFET 4 is connected to the input port 1, the gate (G) of the first MOSFET 4 is connected to the control chip 2, and the source (S) of the first MOSFET 4 is connected to the output port 3 through the inductor 6.

[0061] The drain (D) of the second MOSFET 5 is connected to the output port 3 through the inductor 6, the gate (G) of the second MOSFET 5 is connected to the control chip 2, and the source (S) of the second MOSFET 5 is grounded.

[0062] The control chip 2 and the regulation module 7 are connected in parallel with a current regulation loop 8a for controlling the actual output current of the output port 3 and a voltage regulation loop 8b for controlling the actual output voltage of the output port 3.

[0063] Furthermore, the control module 7 includes a data acquisition unit 701, a setting unit 702, and a microcontroller unit 703. The data acquisition unit 701 is used to acquire the actual output current or the actual output voltage; the setting unit 702 is used to set the target output current or the target output voltage of the output port 3; the microcontroller unit 703 is connected to both the data acquisition unit 701 and the setting unit 702, and is used for data interaction and processing between the data acquisition unit 701 and the setting unit 702.

[0064] In this embodiment, both the current regulation loop 8a and the voltage regulation loop 8b include a first comparator 801, a second comparator 802, and a third comparator 803. The positive input terminal of the first comparator 801 is connected to the output terminal of the second comparator 802, and the negative input terminal of the first comparator 801 is connected to the positive input terminal of the third comparator 803. Both the positive and negative input terminals of the second comparator 802 are connected to the setting unit 702. The output terminal of the third comparator 803 is connected to its negative input terminal to achieve negative feedback regulation, and the output terminal of the third comparator 803 is connected to the acquisition unit 701 so that the acquisition unit 701 can acquire data on the actual output current or actual output voltage.

[0065] The negative terminal of the input of the first comparator 801 is connected to the output of the first comparator 801 through a first capacitor 807. The negative terminal of the input of the first comparator 801 is also connected to the output of the first comparator 801 through a second capacitor 808 and a voltage divider resistor 809 connected in series. Optionally, a clamping diode 9 is provided between the output of the first comparator 801 and the control chip 2 to protect the control chip 2.

[0066] Furthermore, the current regulation loop 8a also includes a fourth comparator 805 and a current-side resistor 804 connected between the inductor 6 and the output port 3. The positive input terminal of the fourth comparator 805 is connected to the end of the current-side resistor 804 closest to the inductor 6; the negative input terminal of the fourth comparator 805 is connected to the end of the current-side resistor 804 closest to the output port 3; and the output terminal of the fourth comparator 805 is connected to the positive input terminal of the third comparator 803 in the current regulation loop 8a.

[0067] The voltage regulation loop 8b also includes a voltage-side resistor 806; the positive input terminal of the third comparator 803 of the voltage regulation loop 8b is connected to one end of the inductor 6 near the current-side resistor 804 through the voltage-side resistor 806.

[0068] The voltage and current dual-loop controlled power supply system provided in this embodiment operates as follows:

[0069] S10: Select to enter constant current mode and specify target output current at setting unit 702, or select to enter constant voltage mode and specify target output voltage at setting unit 702;

[0070] If you choose to enter constant current mode, then:

[0071] S201: The microcontroller unit 703 shields the voltage regulation loop 8b or disconnects the voltage regulation loop 8b from the setting unit 702, so that only the current regulation loop 8a is connected to the power supply.

[0072] S202: The setting unit 702 sends a square wave signal that matches the target output current to the control chip 2 through the current regulation loop 8a. The control chip 2 controls the switching cycle of the first MOSFET 4 according to the square wave signal, so that the current at the input port 1 is converted into an actual output current that is basically equal to the target output current after passing through the first MOSFET 4, and is output to the outside through the output port 3.

[0073] S203: During the continuous switching cycle of the first MOSFET 4 controlled by the control chip 2, the following feedback adjustments can be made:

[0074] S2031: The fourth comparator 805 can feed back the actual output current of output port 3 to the acquisition unit 701 and the first comparator 801 of the current regulation loop 8a;

[0075] S2032: The first comparator 801 compares the actual output current obtained by the fourth comparator 805 with the target output current obtained by the setting unit 702, and sends a signal to the control chip 2 according to the difference between the actual output current and the target output current, so that the control chip 2 finely adjusts the switching cycle of the first MOS transistor 4, and finally realizes constant current control.

[0076] If you choose to enter constant voltage mode, then:

[0077] S301: The microcontroller unit 703 shields the current regulation loop 8a or disconnects the current regulation loop 8a from the setting unit 702, so that only the voltage regulation loop 8b is connected to the power supply.

[0078] S302: The setting unit 702 sends a square wave signal that matches the target output voltage to the control chip 2 through the voltage regulation loop 8b. The control chip 2 controls the switching cycle of the first MOSFET 4 according to the square wave signal, so that the voltage at the input port 1 is converted into an actual output voltage that is basically equal to the target output voltage after passing through the first MOSFET 4, and is output to the outside through the output port 3.

[0079] S303: During the continuous switching cycle of the first MOSFET 4 controlled by the control chip 2, the following feedback adjustments can be made:

[0080] The first comparator 801 of the voltage regulation loop 8b can compare the actual output voltage obtained through the voltage side resistor 806 with the target output voltage obtained through the setting unit 702, and send a signal to the control chip 2 according to the difference between the actual output voltage and the target output voltage, so that the control chip 2 finely adjusts the switching cycle of the first MOS transistor 4, and finally realizes voltage control.

[0081] In summary, the voltage and current dual-loop controlled power supply system provided in this embodiment has the following advantages:

[0082] ① It can effectively solve the problem that existing power supplies cannot have both constant current output and constant voltage output functions at the same time. It can selectively perform constant current output or constant voltage output, which greatly enriches the working scenarios that can be used and helps to meet diverse power supply needs.

[0083] ② Existing power supplies have low resolution. Within the full-scale range, the adjustable voltage step size is usually above 10mV. When the load changes significantly in a short time, the slow feedback of output acquisition causes the single feedback loop to cause the setting time to lag significantly behind the voltage output time, and there is also high switching noise. However, the voltage and current dual-loop control power supply system provided in this embodiment has an external setting unit 702, plus a series of comparators to realize independent feedback control of voltage and current dual loops. As long as the target output current or target output voltage is set, each comparator can quickly and dynamically follow the change of output voltage to change the switching cycle of the first MOSFET 4. At the same time, the operational amplifier compensation circuit has a higher common-mode rejection ratio. Combined with loop compensation, the load of the entire power supply is balanced, and the output resolution is adjustable at the 1mV (mA) level, which has higher accuracy.

[0084] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0085] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A voltage and current dual-loop controlled power supply system, characterized in that, It includes an input port (1), a control chip (2), an output port (3), a first MOSFET (4), a second MOSFET (5), an inductor (6), and a control module (7) that constitute the power supply. Among them, the control chip (2) and the regulation module (7) are connected in parallel with a current regulation loop (8a) for controlling the actual output current of the output port (3) and a voltage regulation loop (8b) for controlling the actual output voltage of the output port (3). The drain of the first MOS transistor (4) is connected to the input port (1), the gate of the first MOS transistor (4) is connected to the control chip (2), and the source of the first MOS transistor (4) is connected to the output port (3) through the inductor (6). The drain of the second MOS transistor (5) is connected to the output port (3) through the inductor (6), the gate of the second MOS transistor (5) is connected to the control chip (2), and the source of the second MOS transistor (5) is grounded. The control module (7) includes: Acquisition unit (701), the acquisition unit (701) is used to acquire the actual output current or the actual output voltage; Setting unit (702), the setting unit (702) is used to set the target output current or target output voltage of the output port (3); A microcontroller unit (703) is connected to the acquisition unit (701) and the setting unit (702) respectively; Both the current regulation loop (8a) and the voltage regulation loop (8b) include a first comparator (801), a second comparator (802), and a third comparator (803). in, The positive input terminal of the first comparator (801) is connected to the output terminal of the second comparator (802), and the negative input terminal of the first comparator (801) is connected to the positive input terminal of the third comparator (803); the negative input terminal of the first comparator (801) is connected to the output terminal of the first comparator (801) through the first capacitor (807); The positive and negative input terminals of the second comparator (802) are both connected to the setting unit (702). The output terminal of the third comparator (803) is connected to the negative terminal of the input terminal of the third comparator (803), and the output terminal of the third comparator (803) is connected to the acquisition unit (701).

2. The voltage and current dual-loop controlled power supply system according to claim 1, characterized in that, The current regulation loop (8a) also includes a current-side resistor (804) connected between the inductor (6) and the output port (3).

3. The voltage and current dual-loop controlled power supply system according to claim 2, characterized in that, The current regulation loop (8a) also includes a fourth comparator (805); The positive terminal of the input of the fourth comparator (805) is connected to the end of the current-side resistor (804) near the inductor (6); The negative input terminal of the fourth comparator (805) is connected to the end of the current-side resistor (804) near the output port (3); The output terminal of the fourth comparator (805) is connected to the positive terminal of the input terminal of the third comparator (803) of the current regulation loop (8a).

4. The voltage and current dual-loop controlled power supply system according to claim 2, characterized in that, The voltage regulation loop (8b) also includes a voltage-side resistor (806). The positive input terminal of the third comparator (803) of the voltage regulation loop (8b) is connected to the end of the inductor (6) near the current side resistor (804) through the voltage side resistor (806).

5. The voltage and current dual-loop controlled power supply system according to claim 1, characterized in that, The negative terminal of the input terminal of the first comparator (801) is also connected to the output terminal of the first comparator (801) through a second capacitor (808) and a voltage divider resistor (809) connected in series.

6. The voltage and current dual-loop controlled power supply system according to claim 1, characterized in that, A clamping diode (9) is provided between the output terminal of the first comparator (801) and the control chip (2).

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