Novel impulse current suppression module

Abstract

The utility model relates to a novel impulse current suppression module applied to the field of power supply assemblies, which comprises a power resistor R1, a Zener diode ZD1, an integrated circuit U1 and a post-stage capacitor CI, a power switch Q1 is arranged in the current surge suppression module, two ends of the power switch Q1 are connected with the power resistor R1, the power resistor R1 is connected with the power switch Q1 in parallel, and the integrated circuit U1 is connected with the post-stage capacitor CI. A voltage stabilizing diode ZD1 is arranged in the impulse current suppression module, the voltage stabilizing diode ZD1 is used for supplying power to the integrated circuit U1, a delay switch is arranged in the impulse current suppression module, a voltage stabilizing power supply unit is arranged in the delay switch, the voltage stabilizing power supply unit takes power from an output end, a voltage dividing network is arranged in the delay switch, and the voltage dividing network comprises R3, R7, R9 and R21. The impulse current suppression module has the advantages of being small in size, light in weight and low in power consumption, and compared with a common negative end series connection design scheme, the impulse current suppression module has better universality.

Description

TECHNICAL FIELD

[0001] The utility model relates to a current suppression module, in particular to a new impact current suppression module applied to the field of power supply components. BACKGROUND

[0002] High-voltage direct-current power supply system (typical value 270VDC) as a new generation of high-efficiency power supply architecture has been widely used in aerospace, ship power, 5G communication base station and new energy storage and other fields. Compared with the traditional alternating current system, it has the advantages of low transmission loss, high power density, excellent electromagnetic compatibility and other significant advantages. However, due to the characteristics that the voltage at both ends of the large-capacity energy storage capacitor (such as electrolytic capacitor, film capacitor) commonly existing in the input end cannot be suddenly changed, the capacitor is equivalent to a short circuit when the system starts or the load changes. This rapid charging characteristic will cause a sharp impact current. Taking the typical aviation 270V system as an example, the load side capacitor value can reach tens of thousands of microfarads, and the impact current peak value exceeds 500A in the power-on moment, with a duration of tens of milliseconds, far exceeding the steady-state current of 10-50A. The excessive impact current will trigger the air switch and circuit breaker protection of the front-end device, causing the device to fail to start normally. At the same time, the reliability of power devices is reduced under the influence of repeated impact current, which seriously affects the stable operation of the device and the system reliability.

[0003] The specification of Chinese patent CN221150958U discloses an impact current suppression circuit, which comprises a switch connected between an input voltage and a second capacitor, and a control circuit and a power supply connected with the switch; the control circuit comprises a first diode, a first resistor and a first capacitor connected in series, and the output end of the first capacitor is connected with the switch; the first diode is connected to the input voltage, and the common connection end of the first diode and the first resistor is connected with a third resistor, and the output end of the third resistor is respectively connected with a second diode, a third diode, a fourth resistor and a fifth resistor; the utility model can adjust the size of the impact current by selecting the parameters of the external current-limiting resistor R1 to suppress the capacitor charging current, effectively suppress the impact current within a safe range, effectively suppress the 28V impact current, prevent the impact current from being too large to damage the front-stage power supply, and is suitable for use in aviation motor controllers.

[0004] At present, the common inrush current suppression circuit scheme has many problems, such as the scheme of adding the inrush current suppression circuit to the 270V positive terminal, although it has better universality, but usually needs a precise driving circuit, which greatly increases the complexity of the circuit, and further leads to high cost, large size and weight, and the scheme of adding the inrush current suppression circuit to the 270V negative terminal, although the circuit principle is simple, has the advantages of small size, light weight and low cost, but in the case that the negative terminal of the electrical equipment is directly connected with the shell or the negative terminal of the electrical equipment has Y capacitor connected with the shell, the circuit will be completely disabled or cannot suppress the inrush current flowing through the Y capacitor during startup, and cannot quickly realize inrush current suppression. Practical new type

[0005] In view of the above prior art, the technical problem to be solved by the utility model is that the common inrush current suppression circuit scheme has many problems, and cannot quickly realize inrush current suppression.

[0006] In order to solve the above problems, the utility model provides a novel inrush current suppression module, which comprises a current surge suppression module, a power resistor R1, a voltage stabilizing diode ZD1, an integrated circuit U1 and a rear capacitor CI, the current surge suppression module is internally provided with a power switch Q1, the two ends of the power switch Q1 are connected with the power resistor R1, the power resistor R1 and the power switch Q1 are connected in parallel, and the voltage stabilizing diode ZD1 is used to supply power to the integrated circuit U1, the inrush current suppression module is internally provided with a delay switch, the delay switch is internally provided with a voltage stabilizing power supply unit, the voltage stabilizing power supply unit is powered by an output end, and the delay switch is internally provided with a voltage dividing network, the voltage dividing network comprises R3, R7, R9 and R21.

[0007] In the above novel inrush current suppression module, the scheme has the characteristics of small size, light weight and low power consumption as an inrush current suppression module, and has better universality compared with the common negative terminal series design scheme.

[0008] As a further improvement of the present application, the current surge suppression module supplies power to the integrated circuit U1 through the voltage stabilizing diode ZD1, the integrated circuit U1 is internally provided with an overvoltage comparator OV foot and a resistor, and a voltage dividing network is formed by the integrated circuit U1, the overvoltage comparator OV foot and the resistor, and constitutes a delay switch design, and the built-in power switch Q1 is turned on when the voltage difference between the two ends of the power resistor R1 is lower than the set value.

[0009] As a further improvement of the present application, the size of the current surge suppression module is limited to 1*1 inch standard package.

[0010] As a further improvement of the present application, the front end of the current surge suppression module is disabled, and the front end of the current surge suppression module is provided with a reverse prevention diode.

[0011] In summary, the scheme has the characteristics of small size, light weight and low power consumption as an impulse current suppression module. Compared with the commonly used negative terminal series design scheme, it has better versatility. It can maintain the suppression of impulse current in the case of direct connection of the negative terminal of the electrical equipment and the shell or the connection of the negative terminal of the electrical equipment to the shell with Y capacitor. It does not use an independent power supply to drive the delay trigger circuit of the switch device, greatly reduces the complexity of the circuit, and greatly optimizes the size, cost, weight and power consumption. It also has an under-voltage protection function, which can meet most application requirements. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 Typical application circuit diagram of the first embodiment of the present application;

[0013] Fig. 2 Detailed circuit diagram of the first embodiment of the present application;

[0014] Fig. 3 Working timing diagram of the first embodiment of the present application. DETAILED DESCRIPTION

[0015] The two embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0016] First embodiment:

[0017] Figs. 1-3 A new impulse current suppression module is shown, which includes a current surge suppression module, a power resistor R1, a voltage stabilizing diode ZD1, an integrated circuit U1, and a rear capacitor CI. The current surge suppression module is built-in with a power switch Q1. The two ends of the power switch Q1 are connected with the power resistor R1. The power resistor R1 and the power switch Q1 are connected in parallel. The voltage stabilizing diode ZD1 supplies power to the integrated circuit U1. The impulse current suppression module is built-in with a delay switch. The delay switch is built-in with a voltage stabilizing power supply unit. The voltage stabilizing power supply unit is powered by the output end. The delay switch is built-in with a voltage dividing network, which includes R3, R7, R9 and R21.

[0018] When the high-voltage direct current power supply is powered on, the power switch Q1 does not act. The current charges the rear capacitor CI through the external power resistor R1. The current surge suppression module supplies power to the integrated circuit U1 through the voltage stabilizing diode ZD1. The integrated circuit U1 is built-in with an overvoltage comparator OV pin and a resistor. The integrated circuit U1 and the overvoltage comparator OV pin and the resistor form a voltage dividing network and constitute a delay switch design. When the voltage difference between the two ends of the power resistor R1 is lower than the set value, the built-in power switch Q1 is turned on. The size of the current surge suppression module is limited to 1x1 inch standard package. The front end of the current surge suppression module is disabled with a capacitor. The front end of the current surge suppression module is placed with a reverse prevention diode.

[0019] The module working timing is as follows:

[0020] T0-T1 stage: input voltage is started, external current limiting resistor charges the rear capacitor C1, output voltage slowly rises, the difference between input and output voltage slowly decreases, power tube drive does not act, its current is zero, current flows through the external current limiting resistor, and the current gradually decreases.

[0021] T1-T2 stage: when the input and output voltage difference is about 20V, the power switch tube drive starts to act, the current flowing through the switch tube has a small recoil, until the power tube is completely open, bypassing the external current limiting resistor.

[0022] T2-T3 stage: the power tube drive gradually rises to 12V.

[0023] T3-T4 stage: the rear load is not started, allowing a small bias current Ib to flow through the power tube.

[0024] T4-T5 stage: the rear load starts to work, and the current completely flows through the power tube.

[0025] T5-T6 stage: the input voltage source is closed, and the module input voltage slowly decreases following the output voltage due to the energy storage of the rear capacitor C1, and when it is lower than the minimum voltage required by the rear circuit, the rear load is closed.

[0026] T6-T7 stage: the input and output voltage continues to decrease, and when it decreases to 100V, the power tube drive voltage is closed.

[0027] T7-T8 stage: due to the existence of internal or external discharge resistance of the module, the input and output current quickly decreases to 0V.

[0028] Figs. 1-3 In actual application, the new impact current suppression module is connected in series at the 270V positive end of the high-voltage DC power supply system. First, according to the actual demand, a power resistor R1 with a suitable resistance value is connected between the power switch Q1 to ensure that when the 270V DC is powered on, the current can charge the rear capacitor C1 through the power resistor R1, and the impact current is suppressed within the required range.

[0029] The voltage stabilizing diode ZD1 introduces the power supply of the drive integrated circuit U1 from the output end, and by adjusting the parameters of resistors R3, R7, R9, R21, etc., it cooperates with the overvoltage comparator OV foot of the integrated circuit U1 to form a delayed switch trigger mechanism. When the voltage difference between the power resistor R1 is lower than the set value, the built-in power switch Q1 is turned on, and the circuit enters a stable working state. At the front end of the module, an anti-reverse diode is placed according to the suggestion, and at the same time, the requirement of disabling the capacitor at the front end of the module is strictly followed to ensure the normal work of the module.

[0030] In the whole working process, the module operates according to the working time sequence diagram, from the time when the input voltage is turned on to the time when the power switch tube is driven to act, the rear stage load is started, the input voltage source is turned off and other stages, orderly and stably work, effectively inhibit the impact current and realize the function of under-voltage protection, meet the performance requirements of the impact current inhibition module of the high-voltage direct-current power supply system, improve the stability and reliability of the system, become the 270V impact current inhibition module with the characteristics of small size, light weight and low power consumption, and add the under-voltage fast shutdown function, can meet most of the application requirements of users.

[0031] In combination with the current actual demand, the above-mentioned embodiments adopted by the present application are not limited to this, various changes made within the knowledge range of the skilled person in the art without departing from the concept of the present application still fall within the protection range of the present application.

Claims

1. A novel inrush current suppression module, characterized in that: The system includes a surge suppression module, a power resistor R1, a Zener diode ZD1, an integrated circuit U1, and a downstream capacitor CI. The surge suppression module has a built-in power switch Q1, the two ends of which are connected to the power resistor R1. The power resistor R1 and the power switch Q1 are connected in parallel, and the Zener diode ZD1 supplies power to the integrated circuit U1. The surge suppression module also has a built-in delay switch with a built-in voltage regulator unit that draws power from its output. The delay switch has a built-in voltage divider network, which includes resistors R3, R7, R9, and R21.

2. The novel inrush current suppression module according to claim 1, characterized in that: The current surge suppression module supplies power to the integrated circuit U1 through the Zener diode ZD1. The integrated circuit U1 has an overvoltage comparator OV pin and a resistor built in. The voltage divider network formed by the integrated circuit U1, the overvoltage comparator OV pin and the resistor constitutes a delayed switch design. When the voltage difference across the power resistor R1 is lower than the set value, the built-in power switch Q1 is turned on.

3. The novel inrush current suppression module according to claim 2, characterized in that: The surge suppression module is limited to a 1×1 inch standard package.

4. The novel inrush current suppression module according to claim 3, characterized in that: The current surge suppression module has a disabled capacitor at its front end and an anti-reverse diode is placed at its front end.

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