Wide-width-adjustable power-off time-delay circuit suitable for hydrogenation machine control system

Abstract

The invention relates to a wide-width-adjustable power-off time delay circuit suitable for a hydrogen adding machine control system, and relates to the field of power management of the hydrogen adding machine control system. The wide-range voltage reduction circuit comprises a wide-range voltage reduction module and a voltage stabilization module which are electrically connected in sequence, a voltage input end VIN + is electrically connected to an input end of the wide-range voltage reduction module, and an output end of the voltage stabilization module is electrically connected to an input end of a load circuit. The power-off delay circuit has the advantages that the applicability of the power-off delay circuit can be improved, and the safety of the system is improved.

Description

Technical Field

[0001] The present application relates to the field of power management of a hydrogenation machine control system, and in particular to a wide-range adjustable power-off delay circuit suitable for a hydrogenation machine control system. Background Art

[0002] Power-off delay circuits are widely used in various industrial automation systems, especially in hydrogenation machine control systems. The main function of these circuits is to provide continuous power to the load for a period of time after a sudden power outage in the equipment to ensure safe shutdown or restart of the system.

[0003] In order to meet the needs of different voltage levels, traditional power-off delay circuits often need to be designed separately for each specific voltage. For example, a 5V output corresponds to a 5V power-off delay circuit, and a 12V output corresponds to a 12V power-off delay circuit. This one-to-one design method results in the need to design multiple delay circuits in a system with multiple voltage inputs, which increases the workload of design and maintenance. In addition, when the device suddenly loses power, the energy storage element (such as a supercapacitor) in the traditional power-off delay circuit will gradually reduce the output voltage during the discharge process, causing the load end voltage to drop accordingly. If the power is turned on again in a short time, the sudden increase in voltage when the power is turned on again may cause the control system MCU to fail to work properly because the previous voltage has dropped but has not reached the minimum operating voltage. At the same time, the design of the traditional power-off delay circuit is usually fixed, and the output power and current cannot be adjusted according to different load requirements, further limiting its applicability. Summary of the invention

[0004] In order to improve the applicability of the power-off delay circuit and enhance the safety of the system, the present application provides a wide-range adjustable power-off delay circuit applicable to a hydrogenation machine control system.

[0005] The present application provides a wide adjustable power-off delay circuit applicable to a hydrogenation machine control system, which adopts the following technical solution: A wide-range adjustable power-off delay circuit suitable for a hydrogen filling machine control system comprises a wide-range voltage-step-down module and a voltage-stabilizing module electrically connected in sequence, wherein a voltage input terminal VIN+ is electrically connected to an input terminal of the wide-range voltage-step-down module, and an output terminal of the voltage-stabilizing module is electrically connected to an input terminal of a load circuit.

[0006] By adopting the above technical solution, the combination of the wide-range step-down module and the voltage stabilizing module realizes the function of wide-range input and output, solves the problem that the traditional power-off delay circuit can only have fixed input and output, and enables a single circuit to adapt to the needs of various voltage levels; when the output voltage of the wide-range step-down module does not reach the input voltage range of the voltage stabilizing module, the circuit is open, so that the power-off delay can be achieved after a period of time and then the power is immediately cut off, so as to ensure as much as possible that the control system MCU can still work normally after powering on again in a short time.

[0007] Preferably, the wide-range buck module includes a buck chip U1, a feedback resistor R1 and a feedback resistor R2; the voltage input terminal VIN+ is electrically connected to pin 1 VIN of the buck chip U1, and pin 2 GND of the voltage chip is grounded; pin 3 Adjust of the buck chip U1 is electrically connected to one end of the feedback resistor R1, and the other end of the feedback resistor R1 is grounded, and pin 4 VOUT of the buck chip U1 is electrically connected to pin 3 Adjust of the buck chip U1 through the feedback resistor R2, and pin 4 VOUT of the buck chip U1 is the output terminal of the wide-range buck module.

[0008] By adopting the above technical solution and adjusting the values ​​of the feedback resistor R1 and the feedback resistor R2, the output voltage of the buck chip U1 can be accurately controlled to achieve wide voltage adjustment.

[0009] Preferably, the feedback resistor R1 is an adjustable resistor.

[0010] By adopting the above technical solution, it is convenient to dynamically adjust the resistance value of the feedback resistor R1 to adapt to different voltage adjustment requirements, thereby enhancing the flexibility and adaptability of the circuit.

[0011] Preferably, the wide-band buck module further includes a reverse charging prevention Schottky diode D1, the positive electrode of the reverse charging prevention Schottky diode D1 is grounded, and the negative electrode of the reverse charging prevention Schottky diode D1 is electrically connected to the 4-pin VOUT of the buck chip U1.

[0012] By adopting the above technical solution, the safety and stability of the circuit are improved by setting the anti-reverse charging Schottky diode D1, and the circuit damage caused by voltage reverse charging is prevented.

[0013] Preferably, the voltage stabilizing module includes a voltage stabilizing chip U2, a feedback resistor R1 and a feedback resistor R2, the output end of the wide-range step-down module is electrically connected to pin 1 VIN of the voltage stabilizing chip U2; pin 3 Adjust of the voltage stabilizing chip U2 is electrically connected to one end of the feedback resistor R3, the other end of the feedback resistor R3 is grounded, pin 2 VOUT of the voltage stabilizing chip U2 is electrically connected to pin 3 Adjust of the voltage stabilizing chip U2 through the feedback resistor R4, pin 2 VOUT of the voltage stabilizing chip U2 is the output end of the voltage stabilizing module, and the output end of the voltage stabilizing module is electrically connected to the voltage input end of the load circuit.

[0014] By adopting the above technical solution, the voltage is further stabilized by the voltage stabilizing module, thereby ensuring the input voltage stability of the load circuit and improving the reliability of the entire system.

[0015] Preferably, the feedback resistor R3 is an adjustable resistor.

[0016] By adopting the above technical solution, the resistance value of the feedback resistor R3 is dynamically adjusted to adapt to different voltage regulation requirements, thereby enhancing the flexibility and adaptability of the circuit.

[0017] Preferably, it further includes a charging and discharging module, which includes a supercapacitor C5 and a resistor R5; the output end of the wide-range step-down module is electrically connected to the positive electrode of the supercapacitor C5, and the negative electrode of the supercapacitor C5 is grounded through the resistor R5.

[0018] By adopting the above technical solution, electric energy can be stored and released through the charge and discharge module, providing a power-off delay function to ensure that the circuit can continue to work for a period of time in the event of a power outage.

[0019] Preferably, the charging and discharging module also includes an anti-reverse charging Schottky diode D2, the output end of the wide-band buck module is electrically connected to the positive electrode of the anti-reverse charging Schottky diode D2, the negative electrode of the anti-reverse charging Schottky diode D2 is electrically connected to pin 1 VIN of the voltage regulator chip U2, and the negative electrode of the anti-reverse charging Schottky diode D2 is also electrically connected to the positive electrode of the supercapacitor C5.

[0020] By adopting the above technical solution and providing the anti-reverse charging Schottky diode D2, the supercapacitor C5 and the voltage stabilizing chip U2 can be protected from the influence of voltage reverse charging, thereby improving the safety and stability of the circuit.

[0021] Preferably, the resistor R5 is an adjustable resistor.

[0022] By adopting the above technical solution, the resistance value of the resistor RR5 can be dynamically adjusted to adapt to different charging and discharging requirements, thereby enhancing the flexibility and adaptability of the circuit.

[0023] Preferably, the charging and discharging module further includes a switch S, the negative electrode of the supercapacitor C5 is electrically connected to one end of the switch S through a resistor R5, and the other end of the switch S is grounded.

[0024] By adopting the above technical solution, the discharge state of the supercapacitor C1 can be controlled by the switch S, thereby improving the controllability and safety of the circuit.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The combination of the wide-range step-down module and the voltage regulator module realizes the function of wide-range input and output, solves the problem that the traditional power-off delay circuit can only fix the input and output, and enables a single circuit to meet the needs of multiple voltage levels; and when the output voltage of the wide-range step-down module does not reach the input voltage range of the voltage regulator module, the circuit is open at this time, so that the power-off delay can be achieved after a period of time and then the power is immediately cut off, thereby ensuring as much as possible that the control system MCU can still work normally after powering on again in a short time.

[0026] 2. The charge and discharge module controls the charge and discharge rate of the supercapacitor C5 through the adjustable resistor R5, achieving precise control of the delay time and efficiency, meeting the flexible adjustment under different load requirements, and improving the applicability of the overall circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a principle block diagram of an embodiment of the present application; Figure 2 is a circuit diagram of a wide-range step-down module in an embodiment of the present application; Figure 3 It is a circuit diagram of the voltage stabilizing module and the charging and discharging module in the embodiment of the present application.

[0028] Figure numerals: 1. wide-range step-down module; 2. voltage stabilization module; 3. charging and discharging module. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-3 This application is described in further detail.

[0030] The embodiment of the present application discloses a wide-range adjustable power-off delay circuit suitable for a hydrogenation machine control system.

[0031] Reference Figure 1A wide adjustable power-off delay circuit suitable for a hydrogenation machine control system includes a wide voltage step-down module 1 and a voltage stabilizing module 2 which are electrically connected in sequence, and the output end of the voltage stabilizing module 2 is electrically connected to the input end of the load circuit. The wide voltage step-down module 1 can meet different voltage input requirements, and when the output voltage of the wide voltage step-down module 1 does not reach the input voltage range of the voltage stabilizing module 2, the circuit is open, so that the power-off delay can be achieved for a period of time before the power is immediately cut off, which improves the applicability and the safety of the subsequent load circuit.

[0032] refer to Figure 2 The wide-range buck module 1 includes a buck chip U1, a feedback resistor R1, a feedback resistor R2, and an anti-reverse charging Schottky diode D1. The voltage input terminal VIN+ is electrically connected to the 1-pin VIN of the buck chip U1, and the 2-pin GND of the voltage chip is grounded. The 3-pin Adjust of the buck chip U1 is electrically connected to one end of the feedback resistor R1, and the other end of the feedback resistor R1 is grounded. The 4-pin VOUT of the buck chip U1 is electrically connected to the 3-pin Adjust of the buck chip U1 through the feedback resistor R2, and the 4-pin VOUT of the buck chip U1 is the output terminal VOUT+ of the wide-range buck module 1. Among them, the feedback resistor R1 is an adjustable resistor. According to the relevant formula of the buck chip U1 Vout=1.23V (1+R1 / R2), the output voltage value of the 4-pin VOUT of the buck chip U1 can be changed by adjusting the resistance value of the feedback resistor R1, thereby achieving the effect of outputting different voltage values ​​using the same type of module. The positive electrode of the anti-reverse charging Schottky diode D1 is grounded, and the negative electrode of the anti-reverse charging Schottky diode D1 is electrically connected to the 4-pin VOUT of the buck chip U1. The function of the anti-reverse charging Schottky diode D1 is to prevent the load current from reverse charging when the power is off, thereby protecting the circuit.

[0033] The wide-range buck module 1 also includes a capacitor C1 and a capacitor C2. One end of the capacitor C1 is electrically connected to the 1-pin VIN of the buck chip U1, and the other end of the capacitor C1 is grounded. One end of the capacitor C2 is electrically connected to the 4-pin VOUT of the buck chip U1, and the other end of the capacitor C2 is grounded. Both the capacitor C1 and the capacitor C2 play a filtering role. The capacitor C1 can smooth the voltage fluctuation of the input terminal VIN+ output, and the capacitor C2 can improve the stability of the output voltage of the 4-pin VOUT of the buck chip U1.

[0034] refer to Figure 3, the voltage stabilizing module 2 includes a voltage stabilizing chip U2, a feedback resistor R1 and a feedback resistor R2, and the output terminal VOUT+ is electrically connected to the pin 1 VIN of the voltage stabilizing chip U2. The pin 3 Adjust of the voltage stabilizing chip U2 is electrically connected to one end of the feedback resistor R3, and the other end of the feedback resistor R3 is grounded. The pin 2 VOUT of the voltage stabilizing chip U2 is electrically connected to the pin 3 Adjust of the voltage stabilizing chip U2 through the feedback resistor R4. The pin 2 VOUT of the voltage stabilizing chip U2 is the output terminal of the voltage stabilizing module 2, and the output terminal of the voltage stabilizing module 2 is electrically connected to the voltage input terminal of the load circuit. Among them, the feedback resistor R3 is an adjustable resistor. According to the relevant formula of the voltage stabilizing chip U2, Vout=1.25V (1+R3 / R4)+IadjR3, the output voltage value of the pin 2 VOUT of the voltage stabilizing chip U2 can be changed by adjusting the resistance value of the feedback resistor R1, thereby adjusting the regulated output voltage value. For example, using a voltage regulator chip model LM317 can achieve a maximum input of 40V and a regulated output voltage value range of 1.2~37V.

[0035] When the output voltage of the output terminal VOUT+ is lower than the input voltage range of the voltage regulator chip U2, the circuit enters the open circuit state, thereby maintaining the voltage stable during the delay process and preventing the voltage from gradually decreasing.

[0036] The voltage stabilizing module 2 also includes a capacitor C3 and a capacitor C4. One end of the capacitor C3 is electrically connected to the pin 1 VIN of the voltage stabilizing chip U2, and the other end of the capacitor C1 is grounded. One end of the capacitor C2 is electrically connected to the pin 2 VOUT of the voltage stabilizing chip U2, and the other end of the capacitor C2 is grounded. Both the capacitor C1 and the capacitor C2 play a filtering role.

[0037] refer to Figure 3 , the embodiment of the present application also includes a charge and discharge module 3, which includes an anti-reverse charging Schottky diode D2, a supercapacitor C5, a resistor R5 and a switch S. The output terminal VOUT+ is electrically connected to the positive electrode of the anti-reverse charging Schottky diode D2, the negative electrode of the anti-reverse charging Schottky diode D2 is electrically connected to the 1-pin VIN of the voltage stabilizing chip U2, and the negative electrode of the anti-reverse charging Schottky diode D2 is also electrically connected to the positive electrode of the supercapacitor C5, and the negative electrode of the supercapacitor C5 is electrically connected to one end of the switch S through the resistor R5, and the other end of the switch S is grounded. The resistor R5 is an adjustable resistor that can adjust the charging rate of the supercapacitor C5. When the switch S is in a closed state, the delay time and efficiency can be controlled through the charge and discharge module 3.

[0038] The implementation principle of a wide-range adjustable power-off delay circuit suitable for a hydrogen refueling machine control system in an embodiment of the present application is as follows: the combination of a wide-range voltage-reducing module 1 and a voltage-stabilizing module 2 realizes the function of a wide-range input and output, solves the problem that a traditional power-off delay circuit can only have fixed input and output, enables a single circuit to adapt to the requirements of multiple voltage levels, and reduces the workload of design and maintenance; the charge and discharge module 3 controls the charge and discharge rate of the supercapacitor through an adjustable resistor, realizes precise control of the delay time and efficiency, meets the flexible adjustment under different load requirements, and improves the applicability of the overall circuit.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wide adjustable power-off delay circuit suitable for a hydrogenation machine control system, characterized in that: It comprises a wide-range voltage-step-down module (1) and a voltage-stabilizing module (2) which are electrically connected in sequence, wherein a voltage input terminal VIN+ is electrically connected to the input terminal of the wide-range voltage-step-down module (1), and an output terminal of the voltage-stabilizing module (2) is electrically connected to the input terminal of a load circuit.

2. According to claim 1, a wide adjustable power-off delay circuit suitable for a hydrogenation machine control system is characterized in that: The wide-range buck module (1) comprises a buck chip U1, a feedback resistor R1 and a feedback resistor R2; the voltage input terminal VIN+ is electrically connected to pin 1 VIN of the buck chip U1, and pin 2 GND of the voltage chip is grounded; pin 3 Adjust of the buck chip U1 is electrically connected to one end of the feedback resistor R1, and the other end of the feedback resistor R1 is grounded; pin 4 VOUT of the buck chip U1 is electrically connected to pin 3 Adjust of the buck chip U1 through the feedback resistor R2, and pin 4 VOUT of the buck chip U1 is the output terminal of the wide-range buck module (1).

3. According to claim 2, a wide adjustable power-off delay circuit suitable for a hydrogenation machine control system is characterized in that: The feedback resistor R1 is an adjustable resistor.

4. According to claim 2, a wide adjustable power-off delay circuit suitable for a hydrogenation machine control system is characterized in that: The wide-band buck module (1) further comprises a reverse-charging Schottky diode D1, wherein the positive electrode of the reverse-charging Schottky diode D1 is grounded, and the negative electrode of the reverse-charging Schottky diode D1 is electrically connected to the 4-pin VOUT of the buck chip U1.

5. According to claim 1, a wide adjustable power-off delay circuit suitable for a hydrogenation machine control system is characterized in that: The voltage stabilizing module (2) comprises a voltage stabilizing chip U2, a feedback resistor R1 and a feedback resistor R2; the output end of the wide-range step-down module (1) is electrically connected to pin 1 VIN of the voltage stabilizing chip U2; pin 3 Adjust of the voltage stabilizing chip U2 is electrically connected to one end of the feedback resistor R3, the other end of the feedback resistor R3 is grounded; pin 2 VOUT of the voltage stabilizing chip U2 is electrically connected to pin 3 Adjust of the voltage stabilizing chip U2 through the feedback resistor R4; pin 2 VOUT of the voltage stabilizing chip U2 is the output end of the voltage stabilizing module (2), and the output end of the voltage stabilizing module (2) is electrically connected to the voltage input end of the load circuit.

6. According to claim 5, a wide adjustable power-off delay circuit suitable for a hydrogenation machine control system is characterized in that: The feedback resistor R3 is an adjustable resistor.

7. According to claim 1, a wide adjustable power-off delay circuit suitable for a hydrogenation machine control system is characterized in that: It also comprises a charging and discharging module (3), which comprises a super capacitor C5 and a resistor R5; the output end of the wide-range step-down module (1) is electrically connected to the positive electrode of the super capacitor C5, and the negative electrode of the super capacitor C5 is grounded through the resistor R5.

8. According to claim 7, a wide adjustable power-off delay circuit suitable for a hydrogenation machine control system is characterized in that: The charging and discharging module (3) further comprises a reverse charging prevention Schottky diode D2, the output end of the wide-band buck module (1) is electrically connected to the positive electrode of the reverse charging prevention Schottky diode D2, the negative electrode of the reverse charging prevention Schottky diode D2 is electrically connected to pin 1 VIN of the voltage stabilizing chip U2, and the negative electrode of the reverse charging prevention Schottky diode D2 is also electrically connected to the positive electrode of the super capacitor C5.

9. According to claim 7, a wide adjustable power-off delay circuit suitable for a hydrogenation machine control system is characterized in that: The resistor R5 is an adjustable resistor.

10. A wide adjustable power-off delay circuit suitable for a hydrogenation machine control system according to claim 7, characterized in that: The charging and discharging module (3) further comprises a switch S, the negative electrode of the supercapacitor C5 is electrically connected to one end of the switch S via a resistor R5, and the other end of the switch S is grounded.

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