A voltage surge generating circuit

Abstract

The utility model discloses a voltage surge generation circuit, include: auxiliary source subcircuit, monostable subcircuit and external power supply switching subcircuit, auxiliary source subcircuit is used for the power supply of monostable subcircuit, monostable subcircuit is used for through the timer output high level time of configuration self, to output control signal, external power supply switching subcircuit is used for under the control of control signal output corresponding surge voltage. The utility model discloses utilize auxiliary source subcircuit, monostable subcircuit and external power supply switching subcircuit composition voltage surge generation circuit, has realized the generation of surge voltage, compared with the existing surge generator has simple structure, response speed is fast and the characteristics of high reliability. Further, can edit the timer peripheral circuit in monostable subcircuit according to actual needs, to control the pulse width of surge voltage, adjusts the surge voltage of external power supply voltage output different voltage grade.

Description

Technical Field

[0001] This utility model belongs to the field of power electronics technology, specifically relating to a voltage surge generation circuit. Background Technology

[0002] With the rapid development of power electronics technology, 28V DC power supply systems for aircraft and vehicles are required to withstand overvoltage surges of 80V / 50ms or 100V / 50ms. These overvoltage surges mostly occur during the start-up and shutdown of aircraft engines or vehicle generators, and load jumps. Traditional methods for simulating these conditions involve using dedicated equipment or utilizing the voltage jump function of a DC source. However, dedicated equipment is typically expensive and complex; the output voltage slope of a DC source is limited by the equipment's own output characteristics, resulting in relatively high cost and bulky size. Utility Model Content

[0003] To address the aforementioned problems in the existing technology, this utility model provides a voltage surge generating circuit. The technical problem to be solved by this utility model is achieved through the following technical solution:

[0004] This utility model embodiment provides a voltage surge generating circuit, including:

[0005] Auxiliary power source sub-circuit, monostable sub-circuit, and external power supply switching sub-circuit; among which,

[0006] The auxiliary source circuit is used to supply power to the monostable sub-circuit;

[0007] The monostable sub-circuit is used to output a control signal by configuring its own timer to output a high-level time.

[0008] The external power switching sub-circuit is used to output the corresponding surge voltage under the control of the control signal.

[0009] In one embodiment of this utility model, the auxiliary source circuit includes: a DC / DC converter and peripheral circuitry of the converter.

[0010] In one embodiment of this utility model, the DC / DC converter is an SCT2A11 synchronous buck DC / DC converter.

[0011] In one embodiment of this utility model, the converter peripheral circuit includes:

[0012] Resistors R1, R2, R3, R4, R5, R6, and R7; capacitors C1, C2, C3, C4, C5, C6, and C7; inductor L1; and diode D1; among which,

[0013] The first end of resistor R1 is connected to a 28V input voltage and connected to the VIN terminal of the DC / DC converter, and the second end is connected to the first end of resistor R2.

[0014] The second end of the resistor R2 is connected to the first end of the capacitor C2;

[0015] The first end of resistor R3 is connected to the second end of resistor R2, and the second end is connected to the second end of capacitor C2.

[0016] The first end of the resistor R4 is connected to the RT terminal of the DC / DC converter, and the second end is grounded;

[0017] The first end of resistor R5 is connected to the first end of capacitor C4, and the second end is connected to the first end of resistor R6.

[0018] The first end of resistor R6 is connected to the first end of resistor R7, and the second end is connected to the second end of resistor R7.

[0019] The first end of the resistor R7 is connected to the first end of the capacitor C5, and the second end is grounded.

[0020] The first terminal of capacitor C1 is connected to the input voltage J1 and is connected to the first terminal of resistor R1, while the second terminal is grounded.

[0021] The first terminal of capacitor C2 is connected to the EN terminal of the DC / DC converter, and the second terminal is connected to the second terminal of resistor R4.

[0022] The first end of capacitor C3 is connected to the SW terminal of the DC / DC converter, and the second end is connected to the BST terminal of the DC / DC converter.

[0023] The first terminal of capacitor C4 is connected to the second terminal of inductor L1, and the second terminal is connected to the first terminal of resistor R7.

[0024] The first terminal of capacitor C5 is connected to the FB terminal of the DC / DC converter, and the second terminal is connected to the second terminal of resistor R7.

[0025] The first terminal of capacitor C6 is connected to the first terminal of resistor R5, and the second terminal is grounded.

[0026] The first terminal of capacitor C7 is connected to the first terminal of capacitor C6, and the second terminal is grounded.

[0027] The first terminal of the inductor L1 is connected to the first terminal of the capacitor C3;

[0028] The input terminal of diode D1 is connected to the first terminal of capacitor C7, and the second terminal serves as the output terminal of the auxiliary source circuit.

[0029] In one embodiment of this utility model, the monostable sub-circuit includes: a timer and a timer peripheral circuit.

[0030] In one embodiment of this utility model, the timer is a 555 timer.

[0031] In one embodiment of this utility model, the timer peripheral circuit includes:

[0032] Capacitors C8, C9, C10, C11, C12, and C13; resistors R8, R9, R10, R11, and R12; switches S1 and S2; among which,

[0033] The first terminal of capacitor C8 is connected to the first terminal of capacitor C9, and the second terminal is grounded.

[0034] The first end of capacitor C9 is connected to pin 7 of the timer, and the second end is connected to the second end of capacitor C8;

[0035] The first terminal of capacitor C10 is connected to the first terminal of switch S1, and the second terminal is connected to the second terminal of capacitor C9.

[0036] The first terminal of capacitor C11 is connected to the first terminal of capacitor C10, and the second terminal is connected to the second terminal of capacitor C10.

[0037] The second terminal of the switch S1 is connected to pin2 of the timer;

[0038] The first end of the switch S2 is connected to the second end of the capacitor C11, and the second end is connected to the first end of the capacitor C11.

[0039] The first terminal of capacitor C12 serves as the input terminal of the monostable sub-circuit, and the second terminal is grounded.

[0040] The first terminal of capacitor C13 is connected to pin 5 of the timer, and the second terminal is connected to pin 3 of the DC / DC converter.

[0041] The first end of resistor R8 is connected to the first end of resistor R9, and the second end is connected to the second end of switch S1.

[0042] The first end of resistor R9 is connected to pin 4 of timer and the first end of capacitor C12, and the second end is connected to the first end of resistor R10.

[0043] The second end of the resistor R10 is connected to the first end of the capacitor C9;

[0044] The first end of the resistor R11 is connected to the first end of the capacitor C12, and the second end is connected to pin 3 of the timer.

[0045] The first end of resistor R12 is connected to the second end of resistor R11, and the second end serves as the output terminal of the monostable sub-circuit.

[0046] In one embodiment of this utility model, the external power switching sub-circuit includes:

[0047] Half-bridge driver chip, peripheral power MOSFETs and other circuits.

[0048] In one embodiment of this utility model, the half-bridge driver chip is an EG2184 half-bridge driver chip.

[0049] In one embodiment of this utility model, the external power switching sub-circuit outputs a corresponding surge voltage under the control of a control signal, including:

[0050] The control signal controls the output of the half-bridge driver chip, causing the peripheral power MOSFETs to turn on or off accordingly, so as to output the corresponding surge voltage.

[0051] The beneficial effects of this utility model are:

[0052] The solution provided in this embodiment utilizes an auxiliary source circuit, a monostable sub-circuit, and an external power supply switching sub-circuit to form a voltage surge generation circuit, thereby generating surge voltage. Compared to existing surge generators, it features a simple structure, fast response speed, and high reliability. Furthermore, the timer peripheral circuit in the monostable sub-circuit can be edited according to actual needs to control the pulse width of the surge voltage and adjust the external power supply voltage to output surge voltages of different levels. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of a voltage surge generating circuit provided in an embodiment of the present utility model;

[0054] Figure 2 The test waveform diagram is provided for a voltage surge generation circuit according to an embodiment of this utility model. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0056] This utility model embodiment provides a voltage surge generating circuit, such as Figure 1 As shown, it may include:

[0057] Auxiliary power source sub-circuit, monostable sub-circuit, and external power supply switching sub-circuit; among which,

[0058] Auxiliary power source circuit, used to power the monostable sub-circuit;

[0059] A monostable sub-circuit is used to output a control signal by configuring its own timer to output a high-level time.

[0060] The external power supply switching sub-circuit is used to output the corresponding surge voltage under the control of the control signal.

[0061] The voltage surge generating circuit proposed in this embodiment can be built using a surge-resistant voltage platform, including but not limited to aircraft and vehicle 28V DC power supply systems, such as... Figure 1 As shown, an external 28V power supply and an 80V / 100V power supply are connected. A monostable sub-circuit composed of a timer controls the half-bridge driver chip to obtain a surge voltage with a specific pulse width at a specific moment. Specifically, the auxiliary source sub-circuit may include a DC / DC converter and its peripheral circuitry. The DC / DC converter can be an SCT2A11 synchronous buck DC / DC converter.

[0062] The converter's peripheral circuitry may include:

[0063] Resistors R1, R2, R3, R4, R5, R6, and R7; capacitors C1, C2, C3, C4, C5, C6, and C7; inductor L1; and diode D1; among which,

[0064] The first terminal of resistor R1 is connected to a 28V input voltage and connected to the VIN terminal of the DC / DC converter, and the second terminal is connected to the first terminal of resistor R2.

[0065] The second terminal of resistor R2 is connected to the first terminal of capacitor C2;

[0066] The first end of resistor R3 is connected to the second end of resistor R2, and the second end of R3 is connected to the second end of capacitor C2.

[0067] The first terminal of resistor R4 is connected to the RT terminal of the DC / DC converter, and the second terminal is grounded.

[0068] The first terminal of resistor R5 is connected to the first terminal of capacitor C4, and the second terminal is connected to the first terminal of resistor R6.

[0069] The first end of resistor R6 is connected to the first end of resistor R7, and the second end is connected to the second end of resistor R7.

[0070] The first terminal of resistor R7 is connected to the first terminal of capacitor C5, and the second terminal is grounded.

[0071] The first terminal of capacitor C1 is connected to the input voltage J1 and is also connected to the first terminal of resistor R1, while the second terminal is grounded.

[0072] The first terminal of capacitor C2 is connected to the EN terminal of the DC / DC converter, and the second terminal is connected to the second terminal of resistor R4;

[0073] The first terminal of capacitor C3 is connected to the SW terminal of the DC / DC converter, and the second terminal is connected to the BST terminal of the DC / DC converter.

[0074] The first terminal of capacitor C4 is connected to the second terminal of inductor L1, and the second terminal of inductor L1 is connected to the first terminal of resistor R7.

[0075] The first terminal of capacitor C5 is connected to the FB terminal of the DC / DC converter, and the second terminal is connected to the second terminal of resistor R7.

[0076] The first terminal of capacitor C6 is connected to the first terminal of resistor R5, and the second terminal is grounded.

[0077] The first terminal of capacitor C7 is connected to the first terminal of capacitor C6, and the second terminal is grounded.

[0078] The first terminal of inductor L1 is connected to the first terminal of capacitor C3;

[0079] The input terminal of diode D1 is connected to the first terminal of capacitor C7, and the second terminal serves as the output terminal of the auxiliary source circuit.

[0080] The output voltage amplitude can be changed by adjusting the values ​​of inductor L1, resistor R5, resistor R6, and resistor R7. The corresponding device parameters in the converter's peripheral circuit can be adjusted according to the power supply requirements of the selected driver chip to achieve the adjustment of the output voltage.

[0081] The monostable sub-circuit may include: a timer and its peripheral circuitry. The timer can be a 555 timer.

[0082] The timer peripheral circuit may include:

[0083] Capacitors C8, C9, C10, C11, C12, and C13; resistors R8, R9, R10, R11, and R12; switches S1 and S2; among which,

[0084] The first terminal of capacitor C8 is connected to the first terminal of capacitor C9, and the second terminal is grounded.

[0085] The first terminal of capacitor C9 is connected to pin 7 of the timer, and the second terminal is connected to the second terminal of capacitor C8;

[0086] The first terminal of capacitor C10 is connected to the first terminal of switch S1, and the second terminal is connected to the second terminal of capacitor C9.

[0087] The first terminal of capacitor C11 is connected to the first terminal of capacitor C10, and the second terminal is connected to the second terminal of capacitor C10.

[0088] The second terminal of switch S1 is connected to pin 2 of timer;

[0089] The first terminal of switch S2 is connected to the second terminal of capacitor C11, and the second terminal of switch S2 is connected to the first terminal of capacitor C11.

[0090] The first terminal of capacitor C12 serves as the input terminal of the monostable sub-circuit, and the second terminal is grounded;

[0091] The first terminal of capacitor C13 is connected to pin 5 of the timer, and the second terminal is connected to pin 3 of the DC / DC converter;

[0092] The first end of resistor R8 is connected to the first end of resistor R9, and the second end is connected to the second end of switch S1.

[0093] The first end of resistor R9 is connected to pin 4 of timer and the first end of capacitor C12, and the second end is connected to the first end of resistor R10.

[0094] The second terminal of resistor R10 is connected to the first terminal of capacitor C9;

[0095] The first terminal of resistor R11 is connected to the first terminal of capacitor C12, and the second terminal is connected to pin 3 of the timer.

[0096] The first end of resistor R12 is connected to the second end of resistor R11, and the second end serves as the output terminal of the monostable sub-circuit.

[0097] The timer's pins 6 and 7 are connected.

[0098] Understandably, switch S1 is a trigger switch and switch S2 is a reset switch.

[0099] The high-level pulse width of the 555 timer output can be adjusted by adjusting the external resistors and capacitors connected to pins 6, 7, and 2.

[0100] The external power switching sub-circuit may include: a half-bridge driver chip, peripheral power MOSFETs, and other circuitry. The half-bridge driver chip may be an EG2184 half-bridge driver chip.

[0101] The external power switching sub-circuit outputs a corresponding surge voltage under the control of a control signal, which may include:

[0102] The control signal controls the output of the half-bridge driver chip, causing the external power MOSFETs to turn on or off accordingly, so as to output the corresponding surge voltage.

[0103] The external power MOSFETs may include power transistors Q1 and Q2, specifically model NCEP040N10D. Other circuitry may include: capacitors C14, C15, C16, and C17; resistors R13, R14, R15, and R16; and diodes D2, D3, and D4.

[0104] The first terminal of capacitor C14 is connected to the first terminal of resistor R11, and the second terminal is grounded.

[0105] The first end of capacitor C15 is connected to pin 8 of the half-bridge driver chip, and the second end is connected to pin 6 of the half-bridge driver chip.

[0106] The first terminal of capacitor C16 is connected to the output terminal of diode D3, and the second terminal is grounded.

[0107] The first terminal of capacitor C17 is connected to the first terminal of capacitor C16, and the second terminal is connected to the second terminal of capacitor C16.

[0108] The first end of resistor R13 is connected to pin 7 of the half-bridge driver chip, and the second end is connected to the first end of resistor R14.

[0109] The second terminal of resistor R14 is connected to the drain terminal of power transistor Q2;

[0110] The first end of resistor R15 is connected to pin 4 of the half-bridge driver chip, and the second end is connected to the first end of resistor R16.

[0111] The second terminal of resistor R16 is grounded;

[0112] The source terminal of power transistor Q1 is connected to the second terminal of resistor R14, the gate terminal is connected to the second terminal of resistor R13, and the drain terminal is connected to the input voltage J3.

[0113] The source terminal of power transistor Q2 is connected to the second terminal of resistor R16, the gate terminal is connected to the first terminal of resistor R16, and the drain terminal is connected to the second terminal of capacitor C15.

[0114] The input terminal of diode D2 is connected to pin 5 of the half-bridge driver chip and the first terminal of capacitor C14, respectively, and the output terminal is connected to the first terminal of capacitor C15.

[0115] The input terminal of diode D3 is connected to the drain terminal of power transistor Q2, and the output terminal is connected to the first terminal of capacitor C16.

[0116] The input terminal of diode D4 is connected to a 28V input voltage, and the output terminal is connected to the first terminal of capacitor C16.

[0117] Diode D2 can be GVS, and diodes D3 and D4 can be NCEP040N10D.

[0118] The output logic of the subsequent half-bridge driver chip can be controlled by using a timer to output high and low level control signals, thereby controlling the timing and amplitude of the external high-voltage source connection. The amplitude of the high-voltage surge can be arbitrarily adjusted by changing the models of Q1, Q2, and D3 in the external power switching sub-circuit and altering the amplitude of the J3 input voltage.

[0119] When the above voltage surge generation circuit is used in a practical surge suppressor or surge generator, it is required to withstand an overvoltage surge of 100V / 50ms. For the test waveform diagram of the voltage surge generation circuit, please refer to [link / reference needed]. Figure 2 As shown in the figure, it can be seen from the final test waveform that the proposed voltage surge generation circuit generates a 100V / 50ms overvoltage surge ( Figure 2 The black voltage spike inside the middle frame is about 80V. This surge voltage is suppressed to about 43V by the subsequent surge suppressor, which meets the requirements of actual test use.

[0120] This voltage surge generation circuit utilizes an auxiliary source sub-circuit, a monostable sub-circuit, and an external power supply switching sub-circuit to generate surge voltage. Compared to existing surge generators, it features a simpler structure, faster response speed, and higher reliability. The timer peripheral circuit in the monostable sub-circuit can be edited according to actual needs to control the pulse width of the surge voltage and adjust the external power supply voltage to output surge voltages of different levels.

[0121] It should be noted that, in the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0122] 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. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model are included within the scope of protection of the present utility model.

Claims

1. A voltage surge generating circuit, characterized in that, include: Auxiliary power source sub-circuit, monostable sub-circuit, and external power supply switching sub-circuit; among which, The auxiliary power source circuit is used to supply power to the monostable sub-circuit; the auxiliary power source circuit includes: a DC / DC converter and peripheral circuitry of the converter; The monostable sub-circuit is used to output a control signal by configuring its own timer to output a high-level time; the monostable sub-circuit includes: a timer and timer peripheral circuitry; The external power switching sub-circuit is used to output a corresponding surge voltage under the control of the control signal; the external power switching sub-circuit includes: Half-bridge driver chip, peripheral power MOSFETs and other circuits; The half-bridge driver chip is the EG2184 half-bridge driver chip.

2. The voltage surge generating circuit according to claim 1, characterized in that, The DC / DC converter is an SCT2A11 synchronous buck DC / DC converter.

3. The voltage surge generating circuit according to claim 1, characterized in that, The peripheral circuit of the converter includes: Resistors R1, R2, R3, R4, R5, R6, and R7; capacitors C1, C2, C3, C4, C5, C6, and C7; inductor L1; and diode D1; among which, The first end of resistor R1 is connected to a 28V input voltage and connected to the VIN terminal of the DC / DC converter, and the second end is connected to the first end of resistor R2. The second end of the resistor R2 is connected to the first end of the capacitor C2; The first end of resistor R3 is connected to the second end of resistor R2, and the second end is connected to the second end of capacitor C2. The first end of the resistor R4 is connected to the RT terminal of the DC / DC converter, and the second end is grounded; The first end of resistor R5 is connected to the first end of capacitor C4, and the second end is connected to the first end of resistor R6. The first end of resistor R6 is connected to the first end of resistor R7, and the second end is connected to the second end of resistor R7. The first end of the resistor R7 is connected to the first end of the capacitor C5, and the second end is grounded. The first terminal of capacitor C1 is connected to the input voltage J1 and is connected to the first terminal of resistor R1, while the second terminal is grounded. The first terminal of capacitor C2 is connected to the EN terminal of the DC / DC converter, and the second terminal is connected to the second terminal of resistor R4. The first end of capacitor C3 is connected to the SW terminal of the DC / DC converter, and the second end is connected to the BST terminal of the DC / DC converter. The first terminal of capacitor C4 is connected to the second terminal of inductor L1, and the second terminal is connected to the first terminal of resistor R7. The first terminal of capacitor C5 is connected to the FB terminal of the DC / DC converter, and the second terminal is connected to the second terminal of resistor R7. The first terminal of capacitor C6 is connected to the first terminal of resistor R5, and the second terminal is grounded. The first terminal of capacitor C7 is connected to the first terminal of capacitor C6, and the second terminal is grounded. The first terminal of the inductor L1 is connected to the first terminal of the capacitor C3; The input terminal of diode D1 is connected to the first terminal of capacitor C7, and the second terminal serves as the output terminal of the auxiliary source circuit.

4. A voltage surge generating circuit according to claim 1, characterized in that, The timer is a 555 timer.

5. A voltage surge generating circuit according to claim 1, characterized in that, The timer peripheral circuit includes: Capacitors C8, C9, C10, C11, C12, and C13; resistors R8, R9, R10, R11, and R12; switches S1 and S2; among which, The first terminal of capacitor C8 is connected to the first terminal of capacitor C9, and the second terminal is grounded. The first end of capacitor C9 is connected to pin 7 of the timer, and the second end is connected to the second end of capacitor C8; The first terminal of capacitor C10 is connected to the first terminal of switch S1, and the second terminal is connected to the second terminal of capacitor C9. The first terminal of capacitor C11 is connected to the first terminal of capacitor C10, and the second terminal is connected to the second terminal of capacitor C10. The second terminal of the switch S1 is connected to pin2 of the timer; The first end of the switch S2 is connected to the second end of the capacitor C11, and the second end is connected to the first end of the capacitor C11. The first terminal of capacitor C12 serves as the input terminal of the monostable sub-circuit, and the second terminal is grounded. The first terminal of capacitor C13 is connected to pin 5 of the timer, and the second terminal is connected to pin 3 of the DC / DC converter. The first end of resistor R8 is connected to the first end of resistor R9, and the second end is connected to the second end of switch S1. The first end of resistor R9 is connected to pin 4 of timer and the first end of capacitor C12, and the second end is connected to the first end of resistor R10. The second end of the resistor R10 is connected to the first end of the capacitor C9; The first end of the resistor R11 is connected to the first end of the capacitor C12, and the second end is connected to pin 3 of the timer. The first end of resistor R12 is connected to the second end of resistor R11, and the second end serves as the output terminal of the monostable sub-circuit.

6. A voltage surge generating circuit according to claim 1, characterized in that, The external power switching sub-circuit outputs a corresponding surge voltage under the control of a control signal, including: The control signal controls the output of the half-bridge driver chip, causing the peripheral power MOSFETs to turn on or off accordingly, so as to output the corresponding surge voltage.

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