Internal and external integrated trigger circuit for excitation fuse

Abstract

The utility model discloses an internal and external integrated trigger circuit for an excitation fuse, which relates to the technical field of new energy circuit protection, and comprises an external trigger unit, which comprises an external trigger interface, a voltage-regulator tube D5 and a signal output interface; the internal trigger unit comprises an arc ignition fuse, a pulse transformer, a half-bridge rectifier circuit and a signal output interface; the external trigger unit receives an external trigger signal through one-way conduction of a voltage-regulator tube D5, and the external trigger signal is transmitted to the igniter through the signal output interface. According to the utility model, through a double-trigger redundancy design, double insurance is formed by external active trigger and internal self-trigger. When external triggering fails, internal triggering still can independently activate the igniter through the pulse transformer and the half-bridge rectifying circuit, and the risk that protection fails when a single Pyro fuse control loop fails is thoroughly avoided. And the response time of the excitation fuse is shorter than that of a traditional hot-melt fuse, so that the diffusion risk of a short-circuit accident is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy circuit protection technical field, concretely is an internal and external integrated trigger circuit for incentive fuse. BACKGROUND

[0002] With the strong demand of users for shortening the charging time of new energy vehicles, manufacturers continue to increase the voltage of power batteries (1000V platform) and increase the charging current. On the other hand, the traditional thermal melting fuse is easily aged due to high temperature rise in a large current environment, and its use scene is increasingly limited. In contrast, the incentive fuse is increasingly popular in use because of its corresponding fast, low internal resistance and low temperature rise. The active and passive integrated incentive fuse has the advantages of corresponding fast and low temperature rise, and under the condition of main loop short circuit, even if the external control loop fails and there is no external trigger signal, it can trigger internally to realize global protection circuit.

[0003] However, the prior art such as comparative document 1 (CN220896308U) includes an internal trigger circuit, an external trigger circuit and a load circuit. Although this scheme improves the protection reliability through a dual-trigger mechanism, it focuses on the dual-trigger framework and does not solve the problems of reverse current protection and intelligent diagnosis, which limits its applicability in new energy vehicle high-voltage platforms. UTILITY MODEL CONTENT

[0004] The utility model technical scheme provides a solution significantly different from the prior art to solve the technical problem that the prior art solution is too single. Specifically, the purpose of the utility model is to provide an internal and external integrated trigger circuit for an incentive fuse to solve the problem that the external trigger incentive fuse cannot output a signal to detonate the igniter when the trigger control loop fails, thereby failing to protect the circuit.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an internal and external integrated trigger circuit for an incentive fuse, comprising:

[0006] The external trigger unit includes an external trigger interface, a voltage stabilizing tube D5 and a signal output interface;

[0007] The internal trigger unit includes an arc ignition fuse, a pulse transformer, a half-bridge rectifier circuit and a signal output interface;

[0008] The external trigger unit receives an external trigger signal through the one-way conduction of the voltage stabilizing tube D5 and transmits it to the igniter through the signal output interface;

[0009] The internal trigger unit triggers the igniter through the arc voltage signal generated by the arc fuse when the main circuit is short-circuited, the arc voltage signal is isolated and boosted through a pulse transformer, is full-wave rectified by a half-bridge rectifier circuit, and is finally output to the igniter through a signal output interface.

[0010] Preferably, the primary winding of the pulse transformer is connected in series with the arc fuse in the main circuit, and the secondary winding is coupled to the half-bridge rectifier circuit through a capacitor.

[0011] Preferably, the half-bridge rectifier circuit uses a high-speed Schottky diode with a conduction voltage drop of less than or equal to 0.5 V.

[0012] The connection mode of the half-bridge rectifier circuit is as follows:

[0013] The anode of the diode D2 is connected to one end of the secondary winding of the pulse transformer, and the cathode is connected to the signal output interface.

[0014] The anode of the diode D4 is connected to the other end of the secondary winding of the pulse transformer, and the cathode is connected to the signal output interface.

[0015] A common cathode rectifier structure is formed to realize unified output of positive and negative polarity signals.

[0016] Preferably, the signal output interface is connected to an igniter, and the igniter includes an internal resistance and gunpowder.

[0017] Preferably, the signal output interface is connected to an igniter, and the igniter includes an internal resistance and gunpowder.

[0018] Preferably, an internal-external integrated trigger circuit for exciting a fuse further includes a resistance unit.

[0019] The resistance unit includes a recognition resistance R1 and a recognition resistance R2.

[0020] The resistance unit is connected in series in the signal input path of the external trigger unit, and is used for detecting the on-off state of the external trigger signal.

[0021] The resistance unit is also connected in parallel with the output end of the internal trigger unit, and is used for monitoring the polarity direction of the internal trigger signal.

[0022] The resistance unit can also be used for detecting the on-off state of the internal resistance of the igniter, and is used for self-checking.

[0023] Compared with the prior art, the internal-external integrated trigger circuit has the following advantages:

[0024] 1.The utility model discloses a double trigger redundancy design: external active trigger and internal self-trigger form double insurance. When external trigger fails: internal trigger can still activate the igniter through the pulse transformer and half bridge rectifier circuit independently, completely avoid the risk of "single fuse control loop failure, protection failure". And the response time of incentive fuse is faster than that of traditional thermal fuse, which significantly reduces the risk of short circuit accident diffusion.

[0025] 2.The utility model discloses a stronger anti-interference and anti-reverse connection ability, with three protection mechanisms:

[0026] (1) rectifier bridge uniform polarity: solve the problem of signal reverse caused by the installation direction error of main circuit;

[0027] (2) voltage stabilizing tube isolation shunt: block the reverse current impact of internal trigger signal on external control system;

[0028] (3) bidirectional transient voltage suppressor: absorb the peak voltage generated by bridge wire fusing, compatible with any wiring method, avoid the shunt ignition current of unidirectional TVS when connected reversely. DRAWINGS

[0029] Figure 1 It is the circuit principle schematic diagram of the utility model;

[0030] In the drawing: 1, internal trigger interface; 2, pulse transformer; 5, signal output interface; 6, transient diode; 10, external trigger interface. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0032] Please refer to Figure 1 The utility model provides a kind of technical scheme: a internal and external integrated trigger circuit for incentive fuse, comprising:

[0033] External trigger unit includes external trigger interface 10, voltage stabilizing tube D5 and signal output interface 5.

[0034] Internal trigger unit includes arc ignition fuse, pulse transformer 2, half bridge rectifier circuit and signal output interface 5.

[0035] The external trigger unit receives external trigger signal by voltage stabilizing tube D5 unidirectional conduction, is transmitted to igniter via signal output interface 5.

[0036] The internal trigger unit triggers the igniter through the signal output interface 5 when the arc voltage signal generated by the arc fuse is fused in the main circuit short circuit, the arc voltage signal is isolated and boosted by the pulse transformer 2, and the full-wave rectification is performed by the half-bridge rectification circuit.

[0037] In the embodiment, the primary winding of the pulse transformer 2 is connected in series with the arc fuse in the main circuit, and the secondary winding is coupled to the half-bridge rectification circuit through a capacitor.

[0038] In the embodiment, the half-bridge rectification circuit uses a high-speed Schottky diode, and the conduction voltage drop is ≤0.5V.

[0039] The connection mode of the half-bridge rectification circuit is as follows:

[0040] The anode of the diode D2 is connected to one end of the secondary winding of the pulse transformer 2, and the cathode is connected to the signal output interface 5.

[0041] The anode of the diode D4 is connected to the other end of the secondary winding of the pulse transformer 2, and the cathode is connected to the signal output interface 5.

[0042] The positive and negative polarity signals are uniformly output.

[0043] In the embodiment, the overvoltage protection module also includes a transient diode 6 connected in parallel across the signal output interface 5, which is used to suppress the peak voltage amplitude > 40V.

[0044] In the embodiment, the signal output interface 5 is connected to the igniter, and the igniter includes an internal resistance and a powder. When the internal resistance is triggered, the powder is detonated, the copper bar circuit is cut off to form an open circuit, thereby protecting the safety of the circuit and peripheral components.

[0045] In the embodiment, the resistance unit is also connected in series in the signal input path of the external trigger unit, which is used to detect the on-off state of the external trigger signal.

[0046] The resistance unit is also connected in parallel with the output end of the internal trigger unit, which is used to monitor the polarity direction of the internal trigger signal.

[0047] And the resistance unit can also be used to detect the on-off state of the internal resistance of the igniter for self-checking.

[0048] The resistance unit includes a recognition resistance R1 and a recognition resistance R2.

[0049] Working principle: when the internal and external integrated trigger circuit for the excitation fuse is used,

[0050] 1. When the main circuit current is abnormal, the control system inputs a trigger signal to the external trigger interface 10, which is transmitted to the signal output interface 5 after passing through the voltage stabilizing tube D5, triggers the igniter, and starts the actuator of the excitation fuse, thereby cutting off the circuit protection system safely.

[0051] 2. When the main circuit current is short-circuited, the arc fuse is fused, the arc voltage signal at both ends is converted through the pulse transformer 2 to realize high-low voltage isolation, is rectified through the half-bridge circuit (diodes D2 and D4) to realize the unification of the positive and negative polarities of the current, and triggers the igniter through the signal output interface 5, and the setting of the half-bridge circuit and the voltage stabilizing tube D5 also avoids the reverse breakdown of the internal trigger signal to the external control system.

[0052] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. An integrated internal and external trigger circuit for energizing a fuse, characterized by, It comprises: An external trigger unit, including an external trigger interface (10), a voltage stabilizing tube D5 and a signal output interface (5); An internal trigger unit, including an arc ignition fuse, a pulse transformer (2), a half-bridge rectifier circuit and a signal output interface (5); The external trigger unit receives external trigger signals through the one-way conduction of the voltage stabilizing tube D5 and transmits them to the igniter through the signal output interface (5); When the main circuit is short-circuited, the internal trigger unit generates an arc voltage signal by fusing the arc ignition fuse, isolates and boosts the signal through the pulse transformer (2), performs full-wave rectification by the half-bridge rectifier circuit, and finally transmits it to the igniter through the signal output interface (5).

2. An internal-external integrated trigger circuit for energizing a fuse according to claim 1, characterized in that: The primary winding of the pulse transformer (2) is connected in series with the arc ignition fuse in the main circuit, and the secondary winding is coupled to the half-bridge rectifier circuit through a capacitor.

3. An integrated internal and external trigger circuit for energizing a fuse according to claim 1, characterized in that: The half-bridge rectifier circuit uses high-speed Schottky diodes with a conduction voltage drop ≤0.5V.

4. An internal-external integrated trigger circuit for energizing a fuse according to claim 3, characterized in that: The half-bridge rectifier circuit includes diode D2 and diode D4, and the connection mode of the half-bridge rectifier circuit is as follows: The anode of diode D2 is connected to one end of the secondary winding of the pulse transformer (2), and the cathode is connected to the signal output interface (5); The anode of diode D4 is connected to the other end of the secondary winding of the pulse transformer (2), and the cathode is connected to the signal output interface (5); To realize the unified output of positive and negative polarity signals.

5. An internal-external integrated trigger circuit for energizing a fuse according to claim 1, characterized in that: It also includes an overvoltage protection module, including a transient diode (6) connected in parallel across the signal output interface (5).

6. An internal-external integrated trigger circuit for energizing a fuse according to claim 1, characterized in that: The signal output interface (5) is connected to an igniter, which includes an internal resistance and gunpowder.

7. An internal-external integrated trigger circuit for energizing a fuse according to claim 1, characterized in that: It also includes a resistance unit; The resistance unit includes identification resistance R1 and identification resistance R2; The resistance unit is connected in series in the signal input path of the external trigger unit, for detecting the on-off state of the external trigger signal; The resistance unit is also connected in parallel with the output terminal of the internal trigger unit, for monitoring the polarity direction of the internal trigger signal; The resistance unit can also be used to detect the on-off state of the internal resistance of the igniter for self-checking.

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