阅读说明：本技术 一种大电流防反接及短路自恢复供电电路 (Heavy current reverse connection prevention and short circuit self-recovery power supply circuit ) 是由 白思春 褚全红 孟长江 刘涛 杨国华 史伟 张丰 李睿凯 于 2021-09-16 设计创作，主要内容包括：本发明提供了一种大电流防反接及短路自恢复供电电路,包括防反接保护继电器K1、短路触发可控硅T1、短路保护继电器K2、手动恢复按钮S1、续流二级管D1、续流二级管D3、电源反接故障指示发光管L1、电流过流故障指示发光管L2和短路电流采集模块V1及滤波电路组成的短路保护模块；本发明所述的一种大电流防反接及短路自恢复供电电路,通过电流采集触发短路触发可控硅T1驱动短路保护继电器K2完成短路保护,通过发光管L1驱动防反接保护继电器K1完成反接保护；而且正常工作时使用防反接保护继电器K1和短路保护继电器K2的常闭点,防反接保护继电器K1和短路保护继电器K2线圈处于不通电状态,避免防反接保护继电器K1和短路保护继电器K2长期工作线圈发热。(The invention provides a large-current reverse connection prevention and short circuit self-recovery power supply circuit which comprises a reverse connection prevention protection relay K1, a short circuit trigger silicon controlled rectifier T1, a short circuit protection relay K2, a manual recovery button S1, a freewheeling diode D1, a freewheeling diode D3, a power supply reverse connection fault indication light-emitting tube L1, a current overcurrent fault indication light-emitting tube L2, a short circuit current acquisition module V1 and a short circuit protection module consisting of a filter circuit; according to the high-current reverse connection prevention and short circuit self-recovery power supply circuit, the current acquisition triggers the short circuit to trigger the silicon controlled rectifier T1 to drive the short circuit protection relay K2 to complete short circuit protection, and the light emitting tube L1 drives the reverse connection prevention protection relay K1 to complete reverse connection protection; and when the anti-reverse-connection protective relay K1 and the short-circuit protective relay K2 are normally closed, the anti-reverse-connection protective relay K1 and the short-circuit protective relay K2 are in an unpowered state, and the long-term working coils of the anti-reverse-connection protective relay K1 and the short-circuit protective relay K2 are prevented from heating.)

1. The utility model provides a heavy current prevents reverse connection and short circuit self recovery power supply circuit which characterized in that: the short-circuit protection module comprises an anti-reverse-connection protection relay K1, a short-circuit trigger silicon controlled rectifier T1, a short-circuit protection relay K2, a manual recovery button S1, a freewheeling diode D1, a freewheeling diode D3, a power supply reverse-connection fault indication light-emitting tube L1, a current overcurrent fault indication light-emitting tube L2, a short-circuit current acquisition module V1 and a filter circuit; a first pin of the reverse connection prevention protection relay K1 is connected to a power supply V +, a second pin of the reverse connection prevention protection relay K1 is connected to a K end of a freewheeling diode D1 and a K end of a fault indication light-emitting tube L1 respectively, an A end of the freewheeling diode D1 is connected to the power supply V +, an A end of a fault indication light-emitting tube L1 is grounded, a third pin of the reverse connection prevention protection relay K1 is closed to a fifth pin of the reverse connection protection relay K1, a fifth pin of the reverse connection protection relay K1 is connected to a third pin of a short-circuit protection relay K2, a first pin of the short-circuit protection relay K2 and a K end of a freewheeling diode D3 respectively, and a third pin of the short-circuit protection relay K2 is closed to the short-circuit protection relay K2The fifth pin of the K2, which is the output terminal V_OUTAnd the output end of the short-circuit protection module also passes through a current acquisition module V1 of the short-circuit protection module, a second pin of a protection relay K2 is respectively connected to an A end of a freewheeling diode D3, a first end of a manual recovery button S1 and an A end of a short-circuit trigger silicon controlled rectifier T1, a second end of the manual recovery button S1 and a K end of a short-circuit trigger silicon controlled rectifier T1 are respectively grounded, and a G end of the short-circuit trigger silicon controlled rectifier T1 is respectively connected to a first end of a resistance-capacitance filter R1 of the short-circuit protection module and a first end of a resistance-capacitance filter C1 of the short-circuit protection module.

2. A large current reverse connection prevention and short circuit self-recovery power supply circuit according to claim 1, characterized in that: the short-circuit protection module further comprises a fault indication light emitting tube L2, the A end of the fault indication light emitting tube L2 is connected to the first end of the current monitoring module V1, the second end of the current monitoring module V1 is grounded, the K end of the short-circuit fault indication light emitting tube L2 is connected to the second end of the resistance-capacitance filter device R1, and the second end of the resistance-capacitance filter device C1 is grounded.

Technical Field

The invention belongs to the technical field of circuit protection of hybrid vehicles, and particularly relates to a high-current reverse connection prevention and short circuit self-recovery power supply circuit.

Background

In a hybrid vehicle, engine control and motor control design can solve the problems of preventing reverse connection prevention of a power supply and short-circuit protection during internal or connected load faults of a control system, general power supply reverse connection prevention is realized by serially connected diodes, but the voltage drop of the diodes is large, and the diodes are increased along with the increase of power supply current, so that the working voltage of a subsequent power supply circuit can be artificially reduced, and the normal work of the subsequent power supply circuit can be influenced; meanwhile, the reverse connection prevention diode generates heat, a special heat dissipation measure is required, and the circuit design structure is limited.

The short circuit prevention of the heavy current generally adopts the measure of connecting fuses in series, but the rated current and the protection current of the fuses are not well matched, the working current value and the open circuit protection current value are greatly influenced by the environmental temperature, the parameters of the fuses need to be selected by considering the comprehensive factors, and special tests and verifications need to be carried out in the later period to ensure that the selected parameters are reasonable and feasible; therefore, once short-circuit protection occurs, the fuse can be burnt out, and devices around the fuse can be affected to blacken or damaged by heating sometimes; therefore, the space for replacing the reserved fuse and the replacement method need to be considered in the initial design stage, the maintainability of the power supply circuit is difficult to guarantee, and the contradiction that the fuse wire is convenient to replace and the circuit is firm in contact needs to be solved.

Disclosure of Invention

In view of this, the present invention provides a large-current reverse connection prevention and short circuit self-recovery power supply circuit, so as to solve the problem that once short circuit protection occurs in the prior art, the fuse will burn out, and further, the manpower consumption and the capital consumption for maintenance are increased.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a large-current reverse connection prevention and short circuit self-recovery power supply circuit comprises a reverse connection prevention protection relay K1, a short circuit trigger silicon controlled T1, a short circuit protection relay K2, a manual recovery button S1, a freewheeling diode D1, a freewheeling diode D3, a power reverse connection fault indication light-emitting tube L1, a current overcurrent fault indication light-emitting tube L2, a short-circuit current acquisition module V1 and a short-circuit protection module consisting of a filter circuit, wherein a first pin of a reverse connection prevention protection relay K1 is connected to a power supply V +, a second pin of the reverse connection prevention protection relay K1 is respectively connected to a K end of the freewheeling diode D1 and a K end of the fault indication light-emitting tube L1, an A end of the freewheeling diode D1 is connected to the power supply V +, an A end of the fault indication light-emitting tube L1 is grounded, a third pin of the reverse connection prevention protection relay K1 is closed to a fifth pin of the reverse connection protection relay K1, and a fifth pin of the reverse connection protection relay K1 and a third pin of the reverse connection protection relay K2 are respectively connected to a third pin of the short circuit protection relay K2, A first pin of the short-circuit protection relay K2, a K end of a freewheeling diode D3, a third pin of the short-circuit protection relay K2 are closed to a fifth pin of the short-circuit protection relay K2, and the fifth pin is an output end V_OUTAnd the output end of the short-circuit protection module also passes through a current acquisition module V1 of the short-circuit protection module, a second pin of a protection relay K2 is respectively connected to an A end of a freewheeling diode D3, a first end of a manual recovery button S1 and an A end of a short-circuit trigger silicon controlled rectifier T1, a second end of the manual recovery button S1 and a K end of a short-circuit trigger silicon controlled rectifier T1 are respectively grounded, and a G end of the short-circuit trigger silicon controlled rectifier T1 is respectively connected to a first end of a resistance-capacitance filter R1 of the short-circuit protection module and a first end of a resistance-capacitance filter C1 of the short-circuit protection module.

Further, the short-circuit protection module further comprises a fault indication light emitting tube L2, the A end of the fault indication light emitting tube L2 is connected to the first end of the current monitoring module V1, the second end of the current monitoring module V1 is grounded, the K end of the short-circuit fault indication light emitting tube L2 is connected to the second end of the resistance-capacitance filter device R1, and the second end of the resistance-capacitance filter device C1 is grounded.

Compared with the prior art, the high-current reverse connection prevention and short circuit self-recovery power supply circuit has the following beneficial effects:

(1) the invention relates to a large-current reverse connection prevention and short circuit self-recovery power supply circuit which adopts a reverse connection prevention protection relay K1, a short circuit protection relay K2 and a short circuit trigger controlled silicon T1, wherein reverse connection prevention is completed through switching of the relays, and short circuit trigger controlled silicon T1 is triggered through current acquisition to complete short circuit protection; in addition, normally closed points of the reverse connection prevention protection relay K1 and the short circuit protection relay K2 are used during normal work, coils of the reverse connection prevention protection relay K1 and the short circuit protection relay K2 are in an unpowered state, heating of long-term working coils of the reverse connection prevention protection relay K1 and the short circuit protection relay K2 is avoided, and meanwhile, the influence on the service life of a contact during large-current work in a normal open point mode is not considered; when overcurrent protection of the circuit occurs, the power failure can be recovered, and power supply can also be recovered through a manual recovery button S1; the circuit has a circuit reverse connection indication, namely a fault indication light-emitting tube L1, and has a current over-current indication, namely a fault indication light-emitting tube L2, so that the circuit reverse connection and the circuit short circuit fault can be conveniently identified, and a large amount of maintenance funds and energy are not consumed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic diagram of a large-current reverse connection prevention and short circuit self-recovery power supply circuit according to an embodiment of the present invention;

fig. 2 is a schematic diagram of the connection and current flow direction of the freewheeling diode D1, the fault indicating light-emitting tube L1 and the reverse-connection prevention protection relay K1 when the power supply is connected in the forward direction according to the embodiment of the present invention;

fig. 3 is a schematic diagram of the connection and current flow direction of the freewheeling diode D1, the fault indicating light-emitting tube L1 and the reverse-connection prevention protection relay K1 when the power supply is reversely connected according to the embodiment of the present invention;

fig. 4 is a schematic diagram of the connection and current flow direction of the manual recovery button S1, the freewheeling diode D3, the short-circuit protection relay K2, the short-circuit trigger thyristor T1 and the short-circuit protection module during short circuit according to the embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1, a large-current reverse connection prevention and short circuit self-recovery power supply circuit includes: a reverse connection prevention protection relay K1, a short circuit trigger SCR T1, a short circuit protection relay K2, a manual recovery button S1, a freewheeling diode D1, a freewheeling diode D3, a source reverse connection fault indication light emitting tube L1, a current overcurrent fault indication light emitting tube L2, a short circuit current acquisition module V1 and a short circuit protection module consisting of a filter circuit, wherein a first pin of the reverse connection prevention protection relay K1 is connected to a power supply V +, a second pin of the reverse connection prevention protection relay K1 is respectively connected to a K end of the freewheeling diode D1 and a K end of the fault indication light emitting tube L1, an A end of the freewheeling diode D1 is connected to the power supply V +, an A end of the fault indication light emitting tube L1 is grounded, a third pin of the reverse connection prevention protection relay K1 is closed to a fifth pin of the reverse connection protection relay K1, and a fifth pin of the reverse connection protection relay K1 is respectively connected to a third pin of the short circuit protection relay K2 and a first pin of the short circuit protection relay K2, A K end of a freewheeling diode D3, a third pin of a short-circuit protection relay K2 is closed to a fifth pin of a short-circuit protection relay K2, the fifth pin is an output end, the output end further passes through a current acquisition module V1 of the short-circuit protection module, a second pin of a protection relay K2 is respectively connected to an A end of a freewheeling diode D3, a first end of a manual recovery button S1, an A end of a short-circuit trigger thyristor T1, a second end of the manual recovery button S1 and a K end of a short-circuit trigger thyristor T1 are respectively grounded, a G end of the short-circuit trigger thyristor T1 is respectively connected to a first end of a resistance-capacitance filter device R1 of the short-circuit protection module and a first end of a resistance-capacitance filter device C1 of the short-circuit protection module, the short-circuit protection module further comprises a fault indication light emitting tube L2, an A end of the fault indication light emitting tube L2 is connected to a first end of a current monitoring module V1, and a second end of the current acquisition module V1 is grounded, the K end of a fault indication luminous tube L2 is connected to the second end of a resistance-capacitance filter device R1, the second end of a resistance-capacitance filter device C1 is grounded, an anti-reverse connection protection relay K1, a short-circuit protection relay K2 and a short-circuit trigger silicon controlled rectifier T1 are adopted, anti-reverse connection is completed through switching of the relays, and short-circuit protection is completed through current collection trigger short-circuit trigger silicon controlled rectifier T1; in addition, normally closed points of the reverse connection prevention protection relay K1 and the short circuit protection relay K2 are used during normal work, coils of the reverse connection prevention protection relay K1 and the short circuit protection relay K2 are in an unpowered state, heating of long-term working coils of the reverse connection prevention protection relay K1 and the short circuit protection relay K2 is avoided, and meanwhile, the influence on the service life of a contact during large-current work in a normal open point mode is not considered; when overcurrent protection of the circuit occurs, the power failure can be recovered, and power supply can also be recovered through a manual recovery button S1; the circuit has a circuit reverse connection indication, namely a fault indication light-emitting tube L1, and has a current over-current indication, namely a fault indication light-emitting tube L2, so that the circuit reverse connection and the circuit short circuit fault can be conveniently identified, and a large amount of maintenance funds and energy are not consumed;

taking the reverse connection prevention protection relay K1 as an example, the third pin, the fourth pin and the fifth pin of the reverse connection prevention protection relay K1 are contacts of the reverse connection prevention protection relay, wherein the third pin of K1 is a common end;

the model of the reverse connection preventing protective relay K1 and the model of the short circuit protective relay K2 are both JQX-30F/2Z, the model of the short circuit triggering controlled silicon T1 is MCR100-6, the fault indication luminous tube L1 and the fault indication luminous tube L2 are common luminous diodes, the current acquisition module V1 is a current transformer, the model is BZCT18AL, and the manual recovery button S1 is a common manual switch.

The working principle of the invention is as follows: the output terminal is connected to the next stage circuit, and the next stage circuit is the prior art.

As shown in fig. 2, when the power supply is connected correctly, due to the existence of the fault indicating light emitting tube L1, no current flows in the coil of the reverse connection preventing protection relay K1, the reverse connection preventing protection relay K1 does not pull in, and the current is output to the next stage circuit through the third pin and the fifth pin of the reverse connection preventing protection relay K1.

As shown in fig. 3, when the power supply is reversely connected, the current forms a loop through the fault indicating light emitting tube L1 and the coil of the reverse connection prevention protection relay K1, the reverse connection prevention protection relay K1 is attracted, the third pin and the fourth pin of the relay are attracted, the current can only pass through the third pin and the fourth pin, and cannot be output to the next stage of circuit, so that the function of protecting the subsequent circuit in the reverse connection is achieved.

As shown in fig. 4, the current collecting module V1 monitors the current at the output end in real time to form a working current loop proportional to the supply current, as shown by the dashed line on the right of the short-circuit triggered thyristor T1 in fig. 4; a voltage signal is formed through the resistance-capacitance filter device R1 and the resistance-capacitance filter device C1 and is applied to a G pin of the short-circuit trigger controlled silicon T1; when the next-stage circuit is short-circuited, the power supply current suddenly increases, the induced current of the current acquisition module V1 increases, the voltage applied to the G pin of the short-circuit trigger controlled silicon T1 increases, and when the voltage reaches the voltage threshold for triggering the conduction of the controlled silicon T1, the short-circuit trigger controlled silicon T1 conducts; the voltage input from the reverse-connection preventing protection relay K1 passes through the coil of the short-circuit protection relay K2 and the short-circuit trigger silicon controlled rectifier T1 and then reaches the ground to form a loop, as shown by a dotted line on the left side of the short-circuit trigger silicon controlled rectifier T1 in the figure 4, the short-circuit protection relay K2 is attracted, the third pin and the fourth pin of the short-circuit protection relay K2 are attracted, and the current cannot pass through the third pin and the fifth pin to reach the output end, so that the protection effect during short circuit is achieved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.