A load power quick-off and energy storage acceleration discharge circuit

Abstract

The utility model discloses a kind of load power quick turn-off and energy storage acceleration discharge circuit, including power control module, delay start module, quick turn-off module, energy storage module, energy storage discharge module, feedback regulation module;The utility model realizes the quick turn-off of load power by quick disconnecting switch MOS pipe, and utilizes inductance and capacitor and other elements to work cooperatively, realizes the quick discharge of energy storage capacitor, ensure that power restart has good initial state;At the same time, support high-frequency PWM control, can more accurately, efficiently control load circuit, and the circuit design is simple, easy to realize, and lower in cost.

Description

Technical Field

[0001] This utility model relates to the field of discharge circuit technology, specifically to a load power supply fast shutdown and energy storage accelerated discharge circuit. Background Technology

[0002] Currently, most electronic loads operate with non-constant current, and their power consumption is primarily pulse-mode. To ensure the stability of the power supply system, multiple large-capacity energy storage capacitors need to be connected in parallel at the load power input. When the load power is turned off, the large capacitors begin to discharge. However, because the discharge of large capacitors is slow, when the power supply is quickly restarted, the load circuit is re-energized before it has been completely de-energized, which can easily lead to reset abnormalities and system crashes. Utility Model Content

[0003] In view of this, the main objective of this utility model is to provide a circuit for rapid power supply shutdown and accelerated energy storage discharge.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] This utility model embodiment provides a load power supply fast shutdown and energy storage accelerated discharge circuit, including: a power control module, whose input terminal is connected to the power input terminal and its output terminal is connected to the power output terminal, used to convert the input power supply into a stable voltage required by the load.

[0006] The delayed start module is connected to the control chip and the power control module via a control signal line. The delayed start module includes a charging delay circuit composed of resistors and capacitors, which is used to delay the rise time of the enable signal of the power control module and suppress the fast charging current surge of the energy storage module.

[0007] The fast shutdown module shares a control signal line with the delayed start module. It is used to force the enable voltage of the power control module to be pulled down in response to the low-level signal of the control chip, so as to realize the instantaneous shutdown of the power output.

[0008] The energy storage module is connected to the output of the power control module and includes an energy storage capacitor to maintain the stability of the power supply to the load.

[0009] The energy storage discharge module is connected to the charging and discharging circuit of the energy storage module. When the power control module is turned off, it controls the discharge current of the energy storage module.

[0010] The feedback adjustment module connects the output and feedback terminals of the power control module. It dynamically adjusts the output voltage of the power control module through a voltage divider network and a filter capacitor to ensure power supply accuracy.

[0011] In the above scheme, the power control module includes a DC chip, a first capacitor, and a second capacitor. The first terminal of the first capacitor is connected to the power input terminal, the first terminal of the second capacitor, and the IN terminal of the DC chip, respectively. The second terminals of the first capacitor and the second terminals of the second capacitor are both grounded.

[0012] In the above scheme, the delayed start module includes a second resistor and a sixth capacitor. The first end of the second resistor is connected to the MCU_IO terminal of the control chip, the second end of the second resistor is connected to the EN terminal of the DC chip and the first end of the sixth capacitor, and the second end of the sixth capacitor is grounded.

[0013] In the above scheme, the fast shutdown module includes a Schottky diode, the negative terminal of which is connected to the first terminal of the second resistor and the MCU_IO terminal of the control chip, and the positive terminal of the Schottky diode is connected to the EN terminal of the DC chip.

[0014] In the above scheme, the energy storage module includes a fourth capacitor and a fifth capacitor. The first end of the fourth capacitor is connected to the power output terminal and the first end of the fifth capacitor, respectively. The second ends of the fourth capacitor and the fifth capacitor are both grounded.

[0015] In the above scheme, the energy storage and discharge module includes a MOSFET and a fourth resistor. The drain of the MOSFET is connected to the power output terminal, the first terminal of the fourth capacitor, and the first terminal of the fifth capacitor, respectively. The source of the MOSFET is connected to the ground via the fourth resistor in series. The gate of the MOSFET is connected to the EN terminal of the DC chip.

[0016] In the above scheme, the feedback adjustment module includes an inductor, a first resistor, a third resistor, and a third capacitor. The first end of the inductor is connected to the SW terminal of the DC chip. The second end of the inductor is connected to the first end of the first resistor, the first end of the third capacitor, and the power output terminal, respectively. The second end of the third capacitor is connected to the second end of the first resistor, the first end of the third resistor, and the FB terminal of the DC chip, respectively. The second end of the third resistor is grounded.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention achieves rapid power-off of the load by quickly disconnecting the switching MOSFET, and utilizes the coordinated operation of components such as inductors and capacitors to achieve rapid discharge of the energy storage capacitor, ensuring a good initial state when the power supply restarts. At the same time, it supports high-frequency PWM control, which can control the load circuit more accurately and efficiently. The circuit design is simple, easy to implement, and low in cost. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this invention, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a load power supply fast shutdown and energy storage accelerated discharge circuit according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0024] This utility model embodiment provides a circuit for rapid power supply shutdown and accelerated energy storage discharge, such as... Figure 1 As shown, it includes:

[0025] The power control module has its input terminal connected to the power input terminal and its output terminal connected to the power output terminal. It is used to convert the input power into a stable voltage required by the load.

[0026] The delayed start module is connected to the control chip and the power control module via a control signal line. The delayed start module includes a charging delay circuit composed of resistors and capacitors, which is used to delay the rise time of the enable signal of the power control module and suppress the fast charging current surge of the energy storage module.

[0027] The fast shutdown module shares a control signal line with the delayed start module. It is used to force the enable voltage of the power control module to be pulled down in response to the low-level signal of the control chip, so as to realize the instantaneous shutdown of the power output.

[0028] The energy storage module is connected to the output of the power control module and includes an energy storage capacitor to maintain the stability of the power supply to the load.

[0029] The energy storage discharge module is connected to the charging and discharging circuit of the energy storage module. When the power control module is turned off, it controls the discharge current of the energy storage module.

[0030] The feedback adjustment module connects the output and feedback terminals of the power control module. It dynamically adjusts the output voltage of the power control module through a voltage divider network and a filter capacitor to ensure power supply accuracy.

[0031] like Figure 1 As shown, the power control module includes a DC chip U1, a first capacitor C1, and a second capacitor C2. The first end of the first capacitor C1 is connected to the power input terminal VCC, the first end of the second capacitor C2, and the IN terminal of the DC chip U1, respectively. The second ends of the first capacitor C1 and the second ends of the second capacitor C2 are both grounded.

[0032] like Figure 1 As shown, the delayed start module includes a second resistor R2 and a sixth capacitor C6. The first end of the second resistor R2 is connected to the MCU_IO terminal of the control chip, and the second end of the second resistor R2 is connected to the EN terminal of the DC chip U1 and the first end of the sixth capacitor C6, respectively. The second end of the sixth capacitor C6 is grounded.

[0033] like Figure 1 As shown, the fast shutdown module includes a Schottky diode D1. The negative terminal of the Schottky diode D1 is connected to the first terminal of the second resistor R2 and the MCU_IO terminal of the control chip, respectively. The positive terminal of the Schottky diode D1 is connected to the EN terminal of the DC chip U1.

[0034] like Figure 1 As shown, the energy storage module includes a fourth capacitor C4 and a fifth capacitor C5. The first end of the fourth capacitor C4 is connected to the power output terminal VDD and the first end of the fifth capacitor C5, respectively. The second ends of the fourth capacitor C4 and the fifth capacitor C5 are both grounded.

[0035] like Figure 1 As shown, the energy storage and discharge module includes a MOSFET Q1 and a fourth resistor R4. The drain of the MOSFET Q1 is connected to the power output terminal VDD, the first terminal of the fourth capacitor C4, and the first terminal of the fifth capacitor C5, respectively. The source of the MOSFET Q1 is connected to ground after being connected in series with the fourth resistor R4. The gate of the MOSFET Q1 is connected to the EN terminal of the DC chip U1.

[0036] like Figure 1 As shown, the feedback adjustment module includes an inductor L1, a first resistor R1, a third resistor R3, and a third capacitor C3. The first end of the inductor L1 is connected to the SW terminal of the DC chip U1. The second end of the inductor L1 is connected to the first end of the first resistor R1, the first end of the third capacitor C3, and the power output terminal VDD. The second end of the third capacitor C3 is connected to the second end of the first resistor R1, the first end of the third resistor R3, and the FB terminal of the DC chip U1. The second end of the third resistor R3 is grounded.

[0037] The working principle of this utility model is as follows:

[0038] like Figure 1 As shown, DC chip U1 provides a suitable voltage range for the load, and its operating state is controlled by the MCU_IO terminal of the control chip. The fourth capacitor C4 and the fifth capacitor C5 are large energy storage capacitors at the load power input. When the MCU_IO terminal of the control chip is high, the Schottky diode D1 is not conducting, and the MCU_IO terminal charges the sixth capacitor C6 through the second resistor R2, thus delaying the start-up of DC chip U1. This avoids rapid charging of the energy storage capacitors (fourth capacitor C4 and fifth capacitor C5) when the load power is turned on, preventing fluctuations in the system power supply and ensuring power stability. The first resistor R1, the third resistor R3, and the third capacitor C3 form the feedback network of DC chip U1, making the output of DC chip U1 more accurate and stable, and enhancing the robustness of the power network. When the MCU_IO terminal of the control chip is low, the Schottky diode D1 quickly conducts, rapidly discharging the charge on the sixth capacitor C6, causing the EN terminal of DC chip U1 to quickly switch from high to low, turning off DC chip U1 and stopping power supply to the load. After the EN terminal of DC chip U1 quickly transitions from high to low, MOSFET Q1 turns on. The fourth capacitor C4 and the fifth capacitor C5, which are large energy storage capacitors, are connected to ground through MOSFET Q1 and the fourth resistor R4 to quickly discharge the stored energy. This ensures that the system quickly returns to its initial state and prepares for power restart. It can effectively prevent the circuit from being in an unexpected intermediate voltage state, which could cause logic errors and lead to system crashes.

[0039] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A circuit for rapid power supply shutdown and accelerated energy storage discharge of a load, characterized in that, include: The power control module has its input terminal connected to the power input terminal and its output terminal connected to the power output terminal. It is used to convert the input power into a stable voltage required by the load. The delayed start module is connected to the control chip and the power control module via a control signal line. The delayed start module includes a charging delay circuit composed of resistors and capacitors, which is used to delay the rise time of the enable signal of the power control module and suppress the fast charging current surge of the energy storage module. The fast shutdown module shares a control signal line with the delayed start module. It is used to force the enable voltage of the power control module to be pulled down in response to the low-level signal of the control chip, so as to realize the instantaneous shutdown of the power output. The energy storage module is connected to the output of the power control module and includes an energy storage capacitor to maintain the stability of the power supply to the load. The energy storage discharge module is connected to the charging and discharging circuit of the energy storage module. When the power control module is turned off, it controls the discharge current of the energy storage module. The feedback adjustment module connects the output and feedback terminals of the power control module. It dynamically adjusts the output voltage of the power control module through a voltage divider network and a filter capacitor to ensure power supply accuracy.

2. The load power supply rapid shutdown and energy storage accelerated discharge circuit according to claim 1, characterized in that, The power control module includes a DC chip, a first capacitor, and a second capacitor. The first terminal of the first capacitor is connected to the power input terminal, the first terminal of the second capacitor, and the IN terminal of the DC chip, respectively. The second terminals of the first capacitor and the second terminals of the second capacitor are both grounded.

3. The load power supply rapid shutdown and energy storage accelerated discharge circuit according to claim 2, characterized in that, The delayed start module includes a second resistor and a sixth capacitor. The first end of the second resistor is connected to the MCU_IO terminal of the control chip, and the second end of the second resistor is connected to the EN terminal of the DC chip and the first end of the sixth capacitor. The second end of the sixth capacitor is grounded.

4. The load power supply rapid shutdown and energy storage accelerated discharge circuit according to claim 3, characterized in that, The fast shutdown module includes a Schottky diode, the negative terminal of which is connected to the first terminal of the second resistor and the MCU_IO terminal of the control chip, and the positive terminal of the Schottky diode is connected to the EN terminal of the DC chip.

5. The load power supply fast shutdown and energy storage accelerated discharge circuit according to claim 4, characterized in that, The energy storage module includes a fourth capacitor and a fifth capacitor. The first end of the fourth capacitor is connected to the power output terminal and the first end of the fifth capacitor, respectively. The second ends of the fourth capacitor and the fifth capacitor are both grounded.

6. The load power supply rapid shutdown and energy storage accelerated discharge circuit according to claim 5, characterized in that, The energy storage and discharge module includes a MOSFET and a fourth resistor. The drain of the MOSFET is connected to the power output terminal, the first terminal of the fourth capacitor, and the first terminal of the fifth capacitor, respectively. The source of the MOSFET is connected to the ground via the fourth resistor in series. The gate of the MOSFET is connected to the EN terminal of the DC chip.

7. The load power supply fast shutdown and energy storage accelerated discharge circuit according to claim 6, characterized in that, The feedback adjustment module includes an inductor, a first resistor, a third resistor, and a third capacitor. The first end of the inductor is connected to the SW terminal of the DC chip. The second end of the inductor is connected to the first end of the first resistor, the first end of the third capacitor, and the power output terminal. The second end of the third capacitor is connected to the second end of the first resistor, the first end of the third resistor, and the FB terminal of the DC chip. The second end of the third resistor is grounded.

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