Self-adaptive adjustment current source circuit

Abstract

The utility model relates to the technical field of current sources, in particular to a self-adaptive regulation current source circuit, which comprises a power supply main circuit, a current regulation circuit, a current detection circuit, a control circuit and a current regulation feedback circuit, the current detection circuit is connected between the current adjusting circuit and the control circuit and is used for detecting the output current of the current adjusting circuit; the control circuit is connected between the current detection circuit and the current regulation circuit and is used for comparing the output current detected by the current detection circuit with a set reference current and generating an error signal; the current adjusting circuit is used for adjusting the output current according to the error signal; and the current regulation feedback circuit is used for keeping the output current stable through a negative feedback mechanism. The self-adaptive regulation current source circuit provided by the utility model automatically regulates the output current according to the change of the load, keeps the stability of the current of the circuit, and improves the reliability of the circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to current source technical field, concretely relates to a kind of self-adapting regulation current source circuit. BACKGROUND

[0002] With the increasing complexity of modern electronic systems, the demand for accurate current control is also growing. In many application scenarios, such as precision instruments, communication equipment and medical equipment, current source as one of the key components, its performance directly affects the reliability and stability of the entire system. When the load changes, the current source needs to respond quickly and adjust the output current to maintain system performance. However, traditional current source circuits often cannot automatically adjust the output current according to load changes, resulting in unstable current and affecting device performance. These problems not only limit the functionality of the device, but also can cause additional energy loss and shorten the device life. SUMMARY

[0003] The utility model provides a kind of self-adapting regulation current source circuit to the above-mentioned technical deficiency.

[0004] The utility model realizes by the following technical scheme:

[0005] A self-adapting regulation current source circuit is provided, comprising:

[0006] A power supply main circuit (10), a current regulation circuit (20), a current detection circuit (30), a control circuit (40) and a current regulation feedback circuit (50), the input end of the power supply main circuit (10) is connected with AC power supply, the current detection circuit (30) is connected with the current regulation circuit (20) and the control circuit (40) respectively, the control circuit (40) is connected with the current detection circuit (30) and the current regulation circuit (20) respectively, the current regulation circuit (20) is connected with the output end of the power supply main circuit (10), the current detection circuit (30), the control circuit (40) and the current regulation feedback circuit (50) respectively;

[0007] The current detection circuit (30) is used to detect the output current I o of current regulation circuit; the control circuit (40) is used to compare the output current detected by the current detection circuit (30) with the set reference current I a , generate error signal Q; the current regulation circuit (20) is used to adjust the size of output current I o according to error signal Q; the current regulation feedback circuit (50) is used to keep the stability of output current I o by negative feedback mechanism.

[0008] Preferably, the current regulating circuit (20) comprises an operational amplifier U2B, a resistor R12, a resistor R14, a resistor R15, a capacitor C3, a capacitor C4 and a diode D6, wherein:

[0009] The non-inverting input terminal of the operational amplifier U2B is connected to ground (GND) through the resistor R12;

[0010] The inverting input terminal of the operational amplifier U2B is connected to ground (GND) through the capacitor C3 and connected to the resistor R15 through the capacitor C4, and the other end of the resistor R15 is connected to the cathode of the diode D6 and the output terminal of the operational amplifier U2B;

[0011] One end of the resistor R14 is connected to the output terminal of the power main circuit (10), and the other end is connected to the inverting input terminal of the operational amplifier U2B;

[0012] The anode of the diode D6 is connected to the current regulating circuit (20).

[0013] Preferably, the current detecting circuit (30) comprises an operational amplifier U5, a resistor R8, a resistor R21, a resistor R24 and a resistor R25, wherein:

[0014] The non-inverting input terminal of the operational amplifier U5 is connected to ground (GND) through the resistor R21;

[0015] The non-inverting input terminal of the operational amplifier U5 is also connected to the output terminal of the power main circuit (10) through the resistor R8;

[0016] The inverting input terminal of the operational amplifier U5 is connected to the other end of the resistor R8 through the resistor R24;

[0017] One end of the resistor R25 is connected to the inverting input terminal of the operational amplifier U5, the other end is connected to the output terminal of the operational amplifier U5, and is connected to the control circuit (40);

[0018] The ground terminal of the operational amplifier U5 is connected to ground (GND), and the power terminal of the operational amplifier U5 is connected to the VCC terminal.

[0019] Preferably, the control circuit (40) comprises an operational amplifier U6, a resistor R9 and a capacitor C5, wherein:

[0020] The non-inverting input terminal of the operational amplifier U6 is connected to the output terminal of the current detecting circuit (30) through the resistor R9;

[0021] The non-inverting input terminal of the operational amplifier U6 is also connected to ground (GND) through the capacitor C5;

[0022] The inverting input end of the operational amplifier U6 is connected with the output end of the operational amplifier U6 and the current regulating circuit (20); the power supply end of the operational amplifier U6 is connected with the VCC end; and the grounding end of the operational amplifier U6 and the other end of the capacitor C5 are connected with the ground (GND).

[0023] Preferably, the current regulating feedback circuit (50) comprises an operational amplifier U2A, a resistor R5, a resistor R6, a resistor R7, a resistor R10, a resistor R11, a capacitor C2 and a diode D5, wherein:

[0024] The non-inverting input end of the operational amplifier U2A is connected with the ground (GND) through the resistor R5 and connected with the power supply voltage (VCC) through the resistor R7;

[0025] The inverting input end of the operational amplifier U2A is connected with the ground (GND) through the resistor R6 and connected with the ground (GND) through the resistor R10;

[0026] One end of the capacitor C2 is connected with the inverting input end of the operational amplifier U2A, and the other end is connected with the cathode of the diode D5 and the output end of the operational amplifier U2A through the resistor R11;

[0027] The anode of the diode D5 is connected with the feedback end of the power supply main circuit (10) for providing a negative feedback signal to ensure the stability of the output current;

[0028] The other end of the resistor R5 and the other end of the resistor R10 are connected with the ground (GND).

[0029] The advantages and effects of the self-adaptive current regulating circuit are as follows:

[0030] The self-adaptive current regulating circuit can automatically regulate the output current according to the change of the load, keep the stability of the circuit current and improve the reliability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0032] Figure 1 The figure is a principle block diagram of the self-adaptive current regulating circuit of the present application.

[0033] Figure 2 The figure is a principle diagram of the current regulating circuit.

[0034] Figure 3 is a schematic diagram of a current detection circuit.

[0035] Figure 4 is a schematic diagram of a control circuit.

[0036] Figure 5 is a schematic diagram of a current regulation feedback circuit. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0038] The utility model provides a kind of self-adapting regulation current source circuit, as shown in Figure 1 The input end of the power supply main circuit (10) is connected with alternating current power supply, the current detection circuit (30) is connected with the current regulation circuit (20) and the control circuit (40) respectively, the control circuit (40) is connected with the current detection circuit (30) and the current regulation circuit (20) respectively, the current regulation circuit (20) is connected with the output end of the power supply main circuit (10), the current detection circuit (30), the control circuit (40) and the current regulation feedback circuit (50) respectively.

[0039] The current detection circuit (30) is used to detect the output current I o of current regulation circuit;The control circuit (40) is used to compare the output current detected by the current detection circuit (30) with the reference current I a set, and generate error signal Q;The current regulation circuit (20) is used to adjust the size of output current I o according to error signal Q;The current regulation feedback circuit (50) is used to keep the stability of output current I o by negative feedback mechanism.

[0040] Specifically, the current regulation circuit (20) is used to adjust the size of output current according to error signal, including operational amplifier U2B, resistance R12, resistance R14, resistance R15, capacitor C3, capacitor C4 and diode D6, wherein:

[0041] The non-inverting input of operational amplifier U2B is connected to ground (GND) through resistor R12. Operational amplifier U2B is a high-precision operational amplifier and can be an LM358. Resistor R12 provides a ground path for the reference voltage.

[0042] The inverting input of operational amplifier U2B is connected to ground (GND) through capacitor C3, and to resistor R15 through capacitor C4. The other end of resistor R15 is connected to the cathode of diode D6 and the output of operational amplifier U2B. Resistor R15 and capacitor C4 form an RC filter to smooth the output signal of operational amplifier U2B. Capacitor C3 provides high-frequency filtering at the inverting input to reduce noise interference.

[0043] One end of resistor R14 is connected to the output terminal of the main power supply circuit (10), and the other end is connected to the inverting input terminal of operational amplifier U2B, which is used to introduce the output voltage of the main power supply circuit (10) into the inverting input terminal of operational amplifier U2B;

[0044] The anode of diode D6 is connected to the current regulation circuit (20) to provide a regulation signal to ensure the stability of the output current. It can be a Schottky diode, such as 1N5819.

[0045] Specifically, the current detection circuit (30) is used to detect the output current I of the current regulation circuit. o This includes operational amplifier U5, resistor R8, resistor R21, resistor R24, and resistor R25, where:

[0046] The non-inverting input of operational amplifier U5 is connected to ground (GND) through resistor R21. Resistor R21 is used to provide a grounding path for the non-inverting input to ensure voltage stability. The non-inverting input of operational amplifier U5 is also connected to the output of the main power supply circuit (10) through resistor R8. The inverting input of operational amplifier U5 is connected to the other end of resistor R8 through resistor R24. Resistor R24 ​​is used to form negative feedback to ensure stable operation of operational amplifier U5. R8 is a sampling resistor used to detect the output current of the current regulation circuit. Operational amplifier U5 generates a voltage signal proportional to the output current by amplifying the voltage signal on the sampling resistor.

[0047] One end of resistor R25 is connected to the inverting input terminal of operational amplifier U5, and the other end is connected to the output terminal of operational amplifier U5 and the control circuit (40). Together with resistor R24, they form a negative feedback network to ensure the stability of the output signal of operational amplifier U5.

[0048] The ground terminal of operational amplifier U5 is connected to ground (GND), and the power supply terminal of operational amplifier U5 is connected to VCC.

[0049] Specifically, the control circuit (40) is configured to compare the output current detected by the current detection circuit with a set reference current, generate an error signal, including an operational amplifier U6, a resistor R9, and a capacitor C5, wherein:

[0050] The non-inverting input terminal of the operational amplifier U6 is connected to the output terminal of the current detection circuit (30) through the resistor R9; the non-inverting input terminal of the operational amplifier U6 is also connected to the ground (GND) through the capacitor C5; the inverting input terminal of the operational amplifier U6 is connected to the output terminal of the operational amplifier U6 and is connected to the current regulation circuit (20); the power supply terminal of the operational amplifier U6 is connected to the VCC terminal; the ground terminal of the operational amplifier U6 and the other terminal of the capacitor C5 are connected to the ground (GND). The operational amplifier U6 is configured to compare the output current detected by the current detection circuit (30) with a set reference current I a , generate an error signal Q, the resistor R9 is configured to introduce the output signal of the current detection circuit (30) into the non-inverting input terminal of the operational amplifier U6; the capacitor C5 is configured to reduce noise interference and ensure the stability of the error signal Q. The specific process of the control circuit includes:

[0051] Current detection signal input: the output signal of the current detection circuit (30) is introduced into the non-inverting input terminal of the operational amplifier U6 through the resistor R9, and the capacitor C5 is connected to the ground (GND) to reduce noise interference;

[0052] Error signal generation: the non-inverting input terminal of the operational amplifier U6 receives the output signal of the current detection circuit (30), the inverting input terminal is connected to the output terminal, compares the output current detected by the current detection circuit (30) with a set reference current I a , generates an error signal Q, and the error signal Q is transmitted to the current regulation circuit (20) through the output terminal of the operational amplifier U6 to adjust the size of the output current I o ;

[0053] Negative feedback mechanism: through the negative feedback mechanism, the operational amplifier U6 can maintain the stability of the output signal and ensure the accurate control of the output current I o .

[0054] Specifically, the current regulation feedback circuit (50) is configured to maintain the stability of the output current through a negative feedback mechanism, including an operational amplifier U2A, a resistor R5, a resistor R6, a resistor R7, a resistor R10, a resistor R11, a capacitor C2, and a diode D5, wherein:

[0055] The non-inverting input terminal of the operational amplifier U2A is connected to the ground (GND) through the resistor R5 and is connected to the power supply voltage (VCC) through the resistor R7; the inverting input terminal of the operational amplifier U2A is connected to the ground (GND) through the resistor R6 and is connected to the ground (GND) through the resistor R10;

[0056] One end of the capacitor C2 is connected with the inverting input terminal of the operational amplifier U2A, and the other end is connected with the cathode of the diode D5 and the output terminal of the operational amplifier U2A through the resistor R11;

[0057] The anode of the diode D5 is connected with the feedback end of the power supply main circuit (10) for providing a negative feedback signal to ensure the stability of the output current;

[0058] The other end of the resistor R5 and the other end of the resistor R10 are connected with the ground (GND).

[0059] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, if these modifications and changes are within the scope of the present application claims and their equivalents, the present application also intends to include these modifications and changes.

Claims

1. An adaptive regulated current source circuit, comprising: The application relates to a power supply circuit, which comprises a power supply main circuit (10), a current regulating circuit (20), a current detecting circuit (30), a control circuit (40) and a current regulating feedback circuit (50), the input end of the power supply main circuit (10) is connected with an alternating current power supply, the current detecting circuit (30) is connected with the current regulating circuit (20) and the control circuit (40) respectively, the control circuit (40) is connected with the current detecting circuit (30) and the current regulating circuit (20) respectively, the current regulating circuit (20) is connected with the output end of the power supply main circuit (10), the current detecting circuit (30), the control circuit (40) and the current regulating feedback circuit (50) respectively. The current regulating circuit (20) comprises an operational amplifier U2B, a resistor R12, a resistor R14, a resistor R15, a capacitor C3, a capacitor C4 and a diode D6, wherein: The current detection circuit (30) is configured to detect an output current I of the current regulation circuit o The control circuit (40) is configured to compare the output current detected by the current detection circuit (30) with a set reference current I a , and generate an error signal Q. The current regulating circuit (20) is arranged to adjust the output current I in dependence on an error signal Q o ; the current regulating feedback circuit (50) is arranged to maintain the output current I o at a constant value by a negative feedback mechanism.

2. The adaptive current source circuit of claim 1, wherein, The non-inverting input end of the operational amplifier U2B is connected with the ground (GND) through the resistor R12; The inverting input end of the operational amplifier U2B is connected with the ground (GND) through the capacitor C3 and connected with the resistor R15 through the capacitor C4, the other end of the resistor R15 is connected with the cathode of the diode D6 and the output end of the operational amplifier U2B; One end of the resistor R14 is connected with the output end of the power supply main circuit (10), and the other end is connected with the inverting input end of the operational amplifier U2B; The anode of the diode D6 is connected with the current detecting circuit (30). The current detecting circuit (30) comprises an operational amplifier U5, a resistor R8, a resistor R21, a resistor R24 and a resistor R25, wherein:

3. The adaptive current source circuit of claim 1, wherein, The inverting input end of the operational amplifier U5 is connected with the ground (GND) through the resistor R21; The inverting input end of the operational amplifier U5 is also connected with the output end of the power supply main circuit (10) through the resistor R8; The non-inverting input end of the operational amplifier U5 is connected with the other end of the resistor R8 through the resistor R24; One end of the resistor R25 is connected with the inverting input end of the operational amplifier U5, the other end is connected with the output end of the operational amplifier U5 and connected with the control circuit (40); The ground end of the operational amplifier U5 is connected with the ground (GND), and the power supply end of the operational amplifier U5 is connected with the VCC end. The control circuit (40) comprises an operational amplifier U6, a resistor R9 and a capacitor C5, wherein:

4. The adaptive current source circuit of claim 1, wherein, The non-inverting input end of the operational amplifier U6 is connected with the output end of the current detecting circuit (30) through the resistor R9; The non-inverting input end of the operational amplifier U6 is also connected with the ground (GND) through the capacitor C5; The inverting input end of the operational amplifier U6 is connected with the output end of the operational amplifier U6 and connected with the current regulating circuit (20), the power supply end of the operational amplifier U6 is connected with the VCC end, and the ground end of the operational amplifier U6 and the other end of the capacitor C5 are connected with the ground (GND). The current regulating feedback circuit (50) comprises an operational amplifier U2A, a resistor R5, a resistor R6, a resistor R7, a resistor R10, a resistor R11, a capacitor C2 and a diode D5, wherein:

5. The adaptive current source circuit of claim 1, wherein, ​ The non-inverting input terminal of the operational amplifier U2A is connected to the ground (GND) through the resistor R5 and to the power supply voltage (VCC) through the resistor R7; The inverting input terminal of the operational amplifier U2A is connected to the current regulating circuit (20) through the resistor R6 and to the ground (GND) through the resistor R10; One end of the capacitor C2 is connected to the inverting input terminal of the operational amplifier U2A, and the other end is connected to the cathode of the diode D5 and the output terminal of the operational amplifier U2A through the resistor R11; The anode of the diode D5 is connected to the feedback terminal of the power supply main circuit (10) for providing a negative feedback signal to ensure the stability of the output current; The other end of the resistor R5 and the other end of the resistor R10 are connected to the ground (GND).

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