Multi-voltage output power supply circuit of load control terminal

Abstract

The utility model relates to the technical field of power supply circuits, in particular to a multi-voltage output power supply circuit of a load control terminal, which comprises a power supply circuit, a constant current source circuit and a series voltage stabilizing circuit are connected in series on the power supply circuit, and a channel field effect transistor Q1 is arranged in parallel on an energy storage inductor L; the constant current source circuit and the series voltage stabilizing circuit are both arranged on the energy storage inductor L and the channel field effect transistor Q1 in series, the constant current source circuit comprises an integrated circuit IC1 and a triode Q2, and the series voltage stabilizing circuit comprises an integrated circuit IC2 and a triode Q3. The device has a soft start function and can effectively restrain input surge current and output voltage overshoot, the channel field effect transistor Q1 is conducted accordingly to enable induced voltage of a secondary winding of the energy storage inductor L to charge the output capacitor C1, terminal voltage of the capacitor C1 is superposed with 3.3 V main output to form auxiliary output voltage, the working frequency is 750 kHz, and the conversion efficiency can reach 95%.

Description

Technical Field

[0001] The utility model relates to a multi - voltage output power supply circuit, in particular to a multi - voltage output power supply circuit for a negative control terminal, belonging to the technical field of power supply circuits. Background Technique

[0002] A negative control terminal, that is, a load control terminal, is a control terminal used for power load management. It mainly solves the power consumption problem during the power load supply shortage to ensure the power supply for key loads and residential life. The working principle of the negative control terminal is based on modern communication technology, computer technology and automatic control technology. It controls the hardware of the device through the software of the terminal system, simulates various power consumption environments and circuit faults to achieve a comprehensive detection of the functions and performances of the tested terminal devices.

[0003] When the existing constant - current circuit is used at multiple output terminals simultaneously, when one of the protection circuits fails, it will affect the protection circuits of other paths, and the recovery is slow after the fault is eliminated, and the conversion efficiency is too low to meet the usage requirements.

[0004] Therefore, it is urgent to improve the multi - voltage output power supply circuit to solve the above - mentioned existing problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a multi - voltage output power supply circuit for a negative control terminal. This device has a soft - start function, can effectively suppress the input inrush current and output voltage overshoot. The maximum output current is 600 mA. When the output terminal "L" of TPS62000 is at a low level, the trench - type field - effect transistor Q1 conducts accordingly, and the induced voltage of the secondary winding of the energy - storage inductor L charges the output capacitor C1. The terminal voltage of the capacitor C1 is superimposed on the 3.3V main output to be the auxiliary output voltage. If the auxiliary output is 5V, the turns ratio can be taken as 2:1, the working frequency is 750 kHz, and the conversion efficiency can reach 95%.

[0006] In order to achieve the above purpose, the main technical solutions adopted by the utility model include:

[0007] A multi - voltage output power supply circuit for a negative control terminal, including a power supply circuit, a constant - current source circuit and a series voltage - regulating circuit are connected in series on the power supply circuit. The power supply circuit includes a chip U and an energy - storage inductor L electrically connected to the chip U. A trench - type field - effect transistor Q1 is connected in parallel on the energy - storage inductor L. A 3.3V output is electrically connected to the energy - storage inductor L, and a 5V output is electrically connected to the trench - type field - effect transistor Q1;

[0008] The constant current source circuit and the series voltage regulation circuit are both connected in series to the energy storage inductor L and the trench field effect transistor Q1. The constant current source circuit includes an integrated circuit IC1 and a triode Q2, and the series voltage regulation circuit includes an integrated circuit IC2 and a triode Q3.

[0009] Preferably, the model of the chip U is TPS62000. A capacitor C4 is electrically connected to the pin 1 of the chip U, a capacitor C5 is electrically connected to the pin 2 of the chip U, and after the capacitor C4 and the capacitor C5 are connected in parallel, they are electrically connected to the pin 3 of the chip U.

[0010] Preferably, the energy storage inductor L is electrically connected to the pin 9 of the chip U. The model of the trench field effect transistor Q1 is IRLMS6702, and a capacitor C1 is electrically connected between the energy storage inductor L and the trench field effect transistor Q1;

[0011] A capacitor C2 is electrically connected to the energy storage inductor L.

[0012] Preferably, a resistor R1 and a resistor R2 are connected in parallel to the triode Q2. The pin 3 of the triode Q2 is electrically connected to the power supply circuit, and the pin 2 of the triode Q2 is electrically connected to the pin 3 of the integrated circuit IC1.

[0013] Preferably, the pin 2 of the integrated circuit IC1 is electrically connected to the series voltage regulation circuit.

[0014] Preferably, the pin 2 of the triode Q3 is electrically connected to the pin 3 of the integrated circuit IC2. A resistor R3 is electrically connected between the pin 3 and the pin 2 of the triode Q3, and a capacitor C3 is electrically connected between the pin 1 and the pin 3 of the integrated circuit IC2.

[0015] Preferably, a resistor R4 and a resistor R5 are connected in parallel to the pin 1 of the integrated circuit IC2.

[0016] Preferably, a resistor is electrically connected to the pin 5 of the chip U.

[0017] The utility model has at least the following beneficial effects:

[0018] 1. The device has a soft start function, can effectively suppress the input surge current and the output voltage overshoot. The maximum output current is 600 mA. When the output terminal "L" of the TPS62000 is at a low level, the trench field effect transistor Q1 is turned on, and the induced voltage of the secondary winding of the energy storage inductor L charges the output capacitor C1. The terminal voltage of the capacitor C1 is superimposed on the 3.3V main output to obtain the auxiliary output voltage. If the auxiliary output is 5V, the turns ratio can be 2:1, the operating frequency is 750 kHz, and the conversion efficiency can reach 95%.

[0019] 2. The pin 2 of the triode Q2 is electrically connected to the pin 3 of the integrated circuit IC1, and the pin of the integrated circuit IC1 is electrically connected to the series voltage regulator circuit. Since the voltage is always stable at 2.5V, the current flowing through the resistor connected between the REF terminal and the ground should be constant. Using this characteristic, a precise constant current source can be designed with TL431.

[0020] 3. The series voltage regulator circuit can be said to be an extension of the shunt regulator, but it can output a large current. The resistor R3 provides the working current for TL431 and also provides the base current for the transistor Q. The capacitor C3 plays a compensating role. This reference power supply is suitable for occasions where the load current changes, both the power supply current and the load current decrease, or the reference source needs to be put into sleep or turned off. Brief Description of the Drawings

[0021] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0022] Figure 1 is the circuit diagram of the present utility model.

[0023] In the figure, 1. Power supply circuit; 2. Constant current source circuit; 3. Series voltage regulator circuit. Detailed Embodiment

[0024] The following will cooperate with the drawings and embodiments to detail the implementation manner of the present application, so as to fully understand how the present application uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly.

[0025] As Figure 1As shown in the figure, the multi-voltage output power supply circuit of the negative control terminal provided in this embodiment includes a power supply circuit 1. A constant current source circuit 2 and a series voltage regulator circuit 3 are connected in series on the power supply circuit 1. The power supply circuit 1 includes a chip U and a storage inductor L electrically connected to the chip U. A trench field effect transistor Q1 is connected in parallel on the storage inductor L. A 3.3V output is electrically connected to the storage inductor L. A 5V output is electrically connected to the trench field effect transistor Q1. The model of the chip U is TPS62000. A capacitor C4 is electrically connected to the pin 1 of the chip U. A capacitor C5 is electrically connected to the pin 2 of the chip U. After the capacitor C4 and the capacitor C5 are connected in parallel, they are electrically connected to the pin 3 of the chip U. The constant current source circuit 2 and the series voltage regulator circuit 3 are both connected in series on the storage inductor L and the trench field effect transistor Q1. The constant current source circuit 2 includes an integrated circuit IC1 and a triode Q2. The series voltage regulator circuit 3 includes an integrated circuit IC2 and a triode Q3. The 3.3V main power supply is composed of a buck-type single-chip synchronous switching power supply TPS62000. This device has a soft start function, can effectively suppress the input surge current and output voltage overshoot, and the maximum output current is 600mA. When the output terminal "L" of the TPS62000 is at a low level, the storage inductor L is electrically connected to the pin 9 of the chip U. The model of the trench field effect transistor Q1 is IRLMS6702. A capacitor C1 is electrically connected between the storage inductor L and the trench field effect transistor Q1. A capacitor C2 is electrically connected to the storage inductor L. When the externally connected P-channel field effect transistor Q1 is turned on, the induced voltage of the secondary winding of the storage inductor L charges the output capacitor C1. The terminal voltage of the capacitor C1 is superimposed on the 3.3V main output to obtain the auxiliary output voltage, and its value depends on the turn ratio of the primary and secondary windings of the storage inductor L. If the auxiliary output is 5V, the turn ratio can be 2:1, the working frequency is 750kHz, and the conversion efficiency can reach 95%;

[0026] A resistor R1 and a resistor R2 are connected in parallel on the triode Q2. The pin 3 of the triode Q2 is electrically connected to the power supply circuit 1. The pin 2 of the triode Q2 is electrically connected to the pin 3 of the integrated circuit IC1. The pin 2 of the integrated circuit IC1 is electrically connected to the series voltage regulator circuit 3. Since the voltage is always stable at 2.5V, the current flowing through the resistor connected between the REF terminal and the ground should be constant. Using this characteristic, a precise constant current source can be designed with TL431;

[0027] Pin 2 of the triode Q3 is electrically connected to pin 3 of the integrated circuit IC2. A resistor R3 is electrically connected between pin 3 and pin 2 of the triode Q3. A capacitor C3 is electrically connected between pin 1 and pin 3 of the integrated circuit IC2. A resistor R4 and a resistor R5 are connected in parallel on pin 1 of the integrated circuit IC2. A resistor is electrically connected to pin 5 of the chip U. The series voltage regulator circuit 3 can be said to be an expansion of the shunt regulator, but it can output a large current. The resistor R3 provides the working current for TL431 and also provides the base current for the transistor Q. The capacitor C3 plays a compensating role;

[0028] The power dissipation PD of TL431 = Vout * (Iout / β);

[0029] Where β is the transistor amplification factor. This reference power supply is suitable for occasions where the load current changes, the power supply current and the load current decrease simultaneously, or the reference source needs to be put into sleep or turned off.

[0030] Such as Figure 1 As shown, the principle of the multi-voltage output power supply circuit of the negative control terminal provided in this embodiment is as follows:

[0031] A capacitor C5 is electrically connected to pin 2 of the chip U. The capacitor C4 and the capacitor C5 are connected in parallel and then electrically connected to pin 3 of the chip U. The constant current source circuit 2 and the series voltage regulator circuit 3 are both connected in series between the energy storage inductor L and the trench field effect transistor Q1. The constant current source circuit 2 includes the integrated circuit IC1 and the triode Q2. The series voltage regulator circuit 3 includes the integrated circuit IC2 and the triode Q3. The 3.3V main power supply is composed of the buck-type monolithic synchronous switch power supply TPS62000. This device has a soft start function, can effectively suppress the input inrush current and the output voltage overshoot, and has a maximum output current of 600 mA. When the output terminal "L" of the TPS62000 is at a low level, the energy storage inductor L is electrically connected to pin 9 of the chip U. The model of the trench field effect transistor Q1 is IRLMS6702. A capacitor C1 is electrically connected between the energy storage inductor L and the trench field effect transistor Q1. A capacitor C2 is electrically connected to the energy storage inductor L. The externally connected P-channel field effect transistor Q1 is turned on accordingly, and the induced voltage of the secondary winding of the energy storage inductor L charges the output capacitor C1. The terminal voltage of the capacitor C1 is superimposed on the 3.3V main output to be the auxiliary output voltage, and its value depends on the turn ratio of the primary and secondary windings of the energy storage inductor L. If the auxiliary output is 5V, the turn ratio can be taken as 2:1, the operating frequency is 750 kHz, and the conversion efficiency can reach 95%.

[0032] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but rather use the difference in the functions of components as the criterion for distinction. As used throughout the specification and claims, the term "comprising" is an open-ended term and should be interpreted as "including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve technical problems within a certain error range and basically achieve the technical effects.

[0033] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such commodity or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the element.

[0034] The above description shows and describes several preferred embodiments of the present invention. However, as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the technology or knowledge in the relevant field. And any changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A multi-voltage output power supply circuit for a negative control terminal, including a power supply circuit (1), characterized in that, A constant current source circuit (2) and a series voltage regulator circuit (3) are connected in series on the power supply circuit (1). The power supply circuit (1) includes a chip U and a storage inductor L electrically connected to the chip U. A trench field effect transistor Q1 is connected in parallel on the storage inductor L. A 3.3V output is electrically connected to the storage inductor L. A 5V output is electrically connected to the trench field effect transistor Q1. The constant current source circuit (2) and the series voltage regulator circuit (3) are both connected in series on the storage inductor L and the trench field effect transistor Q1. The constant current source circuit (2) includes an integrated circuit IC1 and a triode Q2. The series voltage regulator circuit (3) includes an integrated circuit IC2 and a triode Q3.

2. The multi-voltage output power supply circuit of a negative control terminal according to claim 1, wherein: The model of the chip U is TPS62000. A capacitor C4 is electrically connected to the pin 1 of the chip U. A capacitor C5 is electrically connected to the pin 2 of the chip U. After the capacitor C4 and the capacitor C5 are connected in parallel, they are electrically connected to the pin 3 of the chip U.

3. The multi-voltage output power supply circuit of a negative control terminal according to claim 1, wherein: The storage inductor L is electrically connected to the pin 9 of the chip U. The model of the trench field effect transistor Q1 is IRLMS6702. A capacitor C1 is electrically connected between the storage inductor L and the trench field effect transistor Q1. A capacitor C2 is electrically connected to the storage inductor L.

4. The multi-voltage output power supply circuit of a negative control terminal according to claim 1, wherein: A resistor R1 and a resistor R2 are connected in parallel on the triode Q2. The pin 3 of the triode Q2 is electrically connected to the power supply circuit (1). The pin 2 of the triode Q2 is electrically connected to the pin 3 of the integrated circuit IC1.

5. The multi-voltage output power supply circuit of a negative control terminal according to claim 1, characterized in that: The pin 2 of the integrated circuit IC1 is electrically connected to the series voltage regulator circuit (3).

6. The multi-voltage output power supply circuit of a negative control terminal according to claim 1, wherein: The pin 2 of the triode Q3 is electrically connected to the pin 3 of the integrated circuit IC2. A resistor R3 is electrically connected between the pin 3 and the pin 2 of the triode Q3. A capacitor C3 is electrically connected between the pin 1 and the pin 3 of the integrated circuit IC2.

7. The multi-voltage output power supply circuit of a negative control terminal according to claim 1, characterized in that: A resistor R4 and a resistor R5 are connected in parallel on the pin 1 of the integrated circuit IC2.

8. The multi-voltage output power supply circuit of a negative control terminal according to claim 1, characterized in that: A resistor is electrically connected to the pin 5 of the chip U.

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