CN219394446U - Battery reverse connection preventing circuit, power converter and power supply system - Google Patents
Battery reverse connection preventing circuit, power converter and power supply system Download PDFInfo
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- CN219394446U CN219394446U CN202223465873.9U CN202223465873U CN219394446U CN 219394446 U CN219394446 U CN 219394446U CN 202223465873 U CN202223465873 U CN 202223465873U CN 219394446 U CN219394446 U CN 219394446U
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Abstract
The application discloses a battery reverse connection preventing circuit, a power converter and a power supply system. Wherein, the reverse connection circuit is prevented to the battery includes: the interlocking control module is connected with the battery input port and the relay control signal input port, and is used for receiving the battery input voltage of the battery input port and the relay control signal of the relay control signal input port and outputting a driving signal according to the polarity of the battery input voltage and the relay control signal; the switch unit is connected with the interlocking control module and is turned on or turned off according to the driving signal; the switch unit is also connected with the relay control signal input port and the relay, the relay is connected with the battery input port and the output port, and when the switch unit is conducted, the relay control signal of the relay control signal input port controls the relay to work so as to conduct the battery input port and the output port, thereby providing a technical scheme for realizing reverse connection prevention of the battery with low electric energy loss.
Description
Technical Field
The application relates to the technical field of new energy, in particular to a battery reverse connection preventing circuit, a power converter and a power supply system.
Background
In a battery off-grid inverter and other energy storage inverters for a motor home system, the polarity connection of a battery at the input end of the battery is extremely important, particularly a high-power battery, and once the positive electrode and the negative electrode are reversely connected, the battery is short-circuited, a circuit is damaged, and potential safety hazards such as fire are caused.
The existing reverse connection prevention circuit technologies of some batteries mainly comprise three types: the identification degree of the wiring terminal is increased, for example, different colors or symbol marks are made on the anode and the cathode; the wiring terminal is made into fool-proof design; the input end is made of NMOSFET or PMOSFET and other power semiconductor devices. The first two methods can not completely solve the short circuit problem caused by reverse connection of the anode and the cathode of the battery, but only play a role in reminding during engineering production. The third method can realize reverse connection prevention of the battery, but has some disadvantages: an additional control circuit is needed to drive the power semiconductor device to be turned on and off, so that once a battery is connected into a system, the machine is in a standby state or an off state and needs to work, thereby bringing about certain standby current loss, and the current is at least tens of milliamperes; the on-resistance of the power device is in milliohm level, and when the high-power battery pack supplies power, current enters the system through the power device, and extra electric energy consumption is brought to the battery.
The foregoing description is provided for general background information and does not necessarily constitute prior art.
Disclosure of Invention
In order to solve the above-mentioned problem, the present application provides a battery anti-reverse connection technical scheme for realizing low electric energy loss, which is used for solving the problem that larger additional electric energy loss exists in the existing anti-reverse connection technology.
In one aspect of the present application, a battery anti-reverse connection circuit is provided, comprising: the device comprises a battery input port, a relay control signal input port, an interlocking control module, a switch unit, a relay and an output port;
the interlocking control module is connected with the battery input port and the relay control signal input port, and is used for receiving the battery input voltage of the battery input port and the relay control signal of the relay control signal input port and outputting a driving signal according to the polarity of the battery input voltage and the relay control signal;
the switch unit is connected with the interlocking control module and is turned on or turned off according to the driving signal;
the switch unit is also connected with the relay control signal input port and the relay, the relay is connected with the battery input port and the output port, and when the switch unit is conducted, the relay control signal of the relay control signal input port controls the relay to work so as to conduct the battery input port and the output port.
Optionally, in combination with any one of the above aspects, in another implementation manner of the present aspect, the battery input port includes a first battery input port and a second battery input port;
the output ports comprise a first output port and a second output port;
the relay control signal input port comprises a first control signal port and a second control signal port;
the interlocking control module comprises a first control signal input end, a second control signal input end, a first battery connecting end, a second battery connecting end and a driving signal output end, wherein the first control signal input end is connected with the first control signal port, the second control signal input end is connected with the second control signal port, the first battery connecting end is connected with the first battery input port, and the second battery connecting end is connected with the second battery input port;
the relay comprises a first signal control end, a second signal control end, a first on-off connection end and a second on-off connection end, wherein the first signal control end is connected with the first control signal port, the first on-off connection end is connected with the first battery input port, and the second on-off connection end is connected with the first output port;
the switch unit comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the driving signal output end, the second connecting end is connected with the second signal control end, and the third connecting end is connected with the second control signal port;
the second output port is connected with the second battery input port.
Optionally, with reference to any one of the foregoing aspects, in another implementation manner of this aspect, the interlock control module includes a first optocoupler unit and a second optocoupler unit;
the light emitting diode of the first optocoupler unit is connected between a first control signal port and a second control signal port of the relay control signal input port;
the collector electrode of the light receiving body of the first optocoupler unit is connected with a first battery input port of the battery input port and a first on-off connection end of the relay;
the light emitting diode of the second optical coupling unit is connected between the emitter of the light receiving body of the first optical coupling unit and the second battery input port of the battery input port;
and the collector of the light receiving body of the second optical coupler unit is connected with the first control signal port of the relay control signal input port, and the emitter of the light receiving body of the second optical coupler unit is used as the driving signal output end to be connected with the first connecting end of the switch unit.
Optionally, in combination with any one of the foregoing aspects, in another implementation manner of the present aspect, a cathode of the light emitting diode of the first optocoupler unit is connected to the second control signal port through a first resistor, and an anode of the light emitting diode of the second optocoupler unit is connected to an emitter of the light receptor of the first optocoupler unit through a second resistor.
Optionally, in combination with any one of the foregoing aspects, in another implementation manner of the present aspect, the outputting, according to the polarity of the battery input voltage and the relay control signal, a driving signal includes:
when the relay control signal is an effective signal and the polarity of the battery input voltage is consistent with the conduction direction of the light emitting diode of the second optocoupler unit, the driving signal controls the switch unit to be conducted; otherwise, the switching unit is turned off.
Optionally, in combination with any one of the above aspects, in another implementation manner of the present aspect, the switching unit includes a triode, a third resistor, and a fourth resistor;
the base electrode of the triode is connected with the driving signal output end through the third resistor;
the collector electrode of the triode is connected with the second signal control end of the relay;
the emitter of the triode is connected with a second control signal port of the relay control signal input port;
the fourth resistor is connected between the base electrode of the triode and the second control signal port.
Optionally, in combination with any one of the above aspects, in another implementation manner of the present aspect, the battery input port includes a first battery input port and a second battery input port;
the output ports comprise a first output port and a second output port;
the relay control signal input port comprises a first control signal port and a second control signal port;
the interlocking control module comprises a first control signal input end, a second control signal input end, a first battery connecting end, a second battery connecting end and a driving signal output end, wherein the first control signal input end is connected with the first control signal port, the second control signal input end is connected with the second control signal port, the first battery connecting end is connected with the first battery input port, and the second battery connecting end is connected with the second battery input port;
the relay comprises a first signal control end, a second signal control end, a first on-off connection end, a second on-off connection end, a third on-off connection end and a fourth on-off connection end, wherein the first signal control end is connected with the first control signal port, the first on-off connection end is connected with the first battery input port, and the second on-off connection end is connected with the first output port;
the switch unit comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the driving signal output end, the second connecting end is connected with the second signal control end, and the third connecting end is connected with the second control signal port;
the third disconnection terminal and the fourth disconnection terminal are connected between the second output port and the second battery input port.
In another aspect of the present application, there is further provided a power converter, including a power conversion circuit and a battery anti-reverse connection circuit as described in any one of the above;
the power conversion circuit is connected with the battery through the battery reverse connection preventing circuit.
Optionally, in combination with any one of the above aspects, in another implementation manner of the present aspect, the power conversion circuit is a dc-dc conversion circuit or a dc-ac conversion circuit.
In yet another aspect of the present application, there is provided a power supply system, including a battery, a load, and a power converter as set forth in any one of the above;
the battery supplies power to the load through the power converter.
The technical scheme provided by the application has the following beneficial effects:
the interlocking control module is connected with the battery input port and the relay control signal input port, driving signals can be output according to the polarity of battery input voltage and the relay control signal, the switch unit is further connected with the interlocking control module, so that the switch unit is turned on or turned off according to the driving signals, meanwhile, the switch unit is connected with the relay control signal input port and the relay, the relay is connected with the battery input port and the output port, when the switch unit is turned on, the relay is controlled to work through the relay control signal of the relay control signal input port, the battery input port and the output port are turned on, and circuit faults caused by polarity inversion of the battery can be effectively avoided under the condition that extra electric energy loss is reduced.
The above summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The above summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. The claimed subject matter is not limited to implementations that solve any or all disadvantages noted in the background.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. In the drawings:
fig. 1 is a connection block diagram of a battery reverse connection preventing circuit according to an embodiment of the present application;
fig. 2 is a schematic connection diagram of a battery anti-reverse connection circuit according to an embodiment of the present application;
fig. 3 is a schematic connection diagram of a battery anti-reverse connection circuit including a first optocoupler unit and a second optocoupler unit according to an embodiment of the present application;
fig. 4 is a schematic connection diagram of a battery anti-reverse connection circuit including a first photo-coupler and a second photo-coupler according to an embodiment of the present application;
fig. 5 is a schematic connection diagram of a battery anti-reverse connection circuit including a triode according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a control sequence of a battery reverse connection preventing circuit according to an embodiment of the present application;
fig. 7 is a schematic connection diagram of another battery anti-reverse connection circuit according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. It will be further understood that, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise. Furthermore, the terms "or," "and/or," "including at least one of," and the like, as used herein, are to be construed as inclusive, or mean any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various parameters or modules, these parameters or modules should not be limited by these terms. These terms are only used to distinguish one parameter or module from another of the same type. For example, a first parameter may also be referred to as a second parameter, and similarly, a second parameter may also be referred to as a first parameter, without departing from the scope herein. The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context. Furthermore, components, features, and elements that are identically named in different embodiments of the present application may have the same meaning or may have different meanings, the particular meaning of which is to be determined by its interpretation in this particular embodiment or further in connection with the context of this particular embodiment.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily occurring in sequence, but may be performed alternately or alternately with other steps or at least a portion of the other steps or stages.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the claims.
Referring to fig. 1, a battery reverse connection preventing circuit provided in the present application includes: the device comprises a battery input port, a relay control signal input port, an interlocking control module, a switch unit, a relay and an output port;
the interlocking control module is connected with the battery input port and the relay control signal input port, and is used for receiving the battery input voltage of the battery input port and the relay control signal of the relay control signal input port and outputting a driving signal according to the polarity of the battery input voltage and the relay control signal;
the switch unit is connected with the interlocking control module and is turned on or turned off according to the driving signal;
the switch unit is also connected with the relay control signal input port and the relay, the relay is connected with the battery input port and the output port, and when the switch unit is conducted, the relay control signal of the relay control signal input port controls the relay to work so as to conduct the battery input port and the output port.
In fig. 1, the battery is connected to the interlock control module and the relay through a battery input port (not shown), and the relay control signal is connected to the interlock control module and the switching unit through a relay control signal input port (not shown).
In a specific application scenario, the interlock control module receives an input voltage of the battery and a relay control signal, and outputs a corresponding driving signal according to a polarity of the input voltage of the battery and the relay control signal. The switch unit is conducted under the assumption that the driving signal is normal, and at the moment, the relay control signal drives the relay to work normally, so that conduction between the input port and the output port of the battery is achieved, and the battery can be discharged normally through the relay. If the driving signal is abnormal, the switch unit is turned off, and at the moment, the relay control signal cannot drive the relay to work, the input port and the output port of the battery are not conducted, and the battery cannot be discharged normally.
It should be noted that the driving signal normally refers to a control signal capable of controlling the switching unit to be turned on, and conversely, the driving signal abnormality refers to a control signal capable of controlling the switching unit to be turned off. The battery polarity connection mode is interlocked with the relay control signal, and the interlocking control module outputs a normal driving signal only when the polarity of the battery input voltage meets the requirement, namely the polarity of the battery needs to be connected correctly, and the relay control signal is also input normally. The polarity reversal of the battery and/or abnormal relay control signals can cause abnormal driving signals.
Optionally, with reference to any one of the foregoing aspects, in another implementation manner of this aspect, referring to fig. 2, the battery input port includes a first battery input port and a second battery input port;
the output ports comprise a first output port and a second output port;
the relay control signal input port comprises a first control signal port and a second control signal port;
the interlocking control module comprises a first control signal input end, a second control signal input end, a first battery connecting end, a second battery connecting end and a driving signal output end, wherein the first control signal input end is connected with the first control signal port, the second control signal input end is connected with the second control signal port, the first battery connecting end is connected with the first battery input port, and the second battery connecting end is connected with the second battery input port;
the relay RY1 comprises a first signal control end, a second signal control end, a first on-off connection end and a second on-off connection end, wherein the first signal control end is connected with the first control signal port, the first on-off connection end is connected with the first battery input port, and the second on-off connection end is connected with the first output port;
the switch unit comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the driving signal output end, the second connecting end is connected with the second signal control end, and the third connecting end is connected with the second control signal port;
the second output port is connected with the second battery input port.
It should be noted that the battery input port is used for connecting the battery, the relay control signal input port is used for accessing the relay control signal to the relay RY1, and the output port is used for providing the battery interface to the outside. The relay control signal input port controls on-off between the first control signal input end and the second control signal input end of the interlocking control module through the input relay control signal, for example: the relay control signal is output from the first control signal port, and then the first control signal input end and the second control signal input end are conducted; the relay control signal is output from the second control signal port or is not used for switching off the relay control signal, and the relay control signal is switched off between the first control signal input end and the second control signal input end. On the basis of conduction between a first control signal input end and a second control signal input end of the interlocking control module, the conduction between the first battery connecting end and the second battery connecting end is controlled under the assumption that the polarity of a battery connected to a battery input port meets the requirement, and the disconnection between the first battery connecting end and the second battery connecting end is controlled under the assumption that the polarity of the battery is reversely connected or not connected. The switch unit receives a normal driving signal output by the interlock control module from the first connection terminal on the basis of conduction between the first battery connection terminal and the second battery connection terminal. Under the effect of a normal driving signal, driving current passes through between the first connecting end and the third connecting end of the switch unit, so that conduction between the second connecting end and the third connecting end is facilitated, a relay control signal is transmitted to the first signal control end and the second signal control end of the relay RY1, the first on-off connecting end and the second on-off connecting end are controlled to be connected, and direct current is finally provided to the outside through an output port.
In fig. 2, pin 1 of relay RY1 represents a first on-off connection terminal, pin 2 represents a second on-off connection terminal, and a switch of the relay is arranged between pins 1 and 2; the No. 3 pin represents a first signal control end, the No. 4 pin represents a second signal control end, and a coil of the relay is arranged between the No. 3 pin and the No. 4 pin and is used for driving the switch to be turned on or turned off according to a relay control signal. Bat_in+ represents a port for connecting the positive electrode of the battery, i.e., a first battery input port of the battery input port is for connecting the positive electrode of the battery, and bat_in-represents a port for connecting the negative electrode of the battery, i.e., a second battery input port of the battery input port is for connecting the negative electrode of the battery. Ec+ represents the first control signal port of the relay control signal input port, and Ec-represents the first control signal port of the relay control signal input port. BAT + represents a first output port of the output ports and BAT-represents a second output port of the output ports.
Optionally, with reference to any one of the foregoing aspects, in another implementation manner of this aspect, referring to fig. 3, the interlock control module includes a first optocoupler unit and a second optocoupler unit;
the light emitting diode of the first optocoupler unit is connected between a first control signal port and a second control signal port of the relay control signal input port;
the collector electrode of the light receiving body of the first optocoupler unit is connected with a first battery input port of the battery input port and a first on-off connection end of the relay;
the light emitting diode of the second optical coupling unit is connected between the emitter of the light receiving body of the first optical coupling unit and the second battery input port of the battery input port;
and the collector of the light receiving body of the second optical coupler unit is connected with the first control signal port of the relay control signal input port, and the emitter of the light receiving body of the second optical coupler unit is used as the driving signal output end to be connected with the first connecting end of the switch unit.
The on-off state of the light emitting diode of the first optocoupler unit is directly related to the on-off state between the collector and the emitter of the light receiving body of the first optocoupler unit. The on-off state of the light emitting diode of the second optocoupler unit is directly related to the on-off state between the collector and the emitter of the light receiving body of the second optocoupler unit. And if the relay control signal input port inputs a relay control signal meeting the requirement, the light emitting diode of the first optical coupling unit is turned on, otherwise, the light emitting diode of the first optical coupling unit is turned off. On the basis of the conduction of the light emitting diode of the first optical coupling unit, if the battery input port is connected with a battery meeting the polarity requirement, the collector and the emitter of the light receiving body of the first optical coupling unit are conducted, and then the light emitting diode of the second optical coupling unit is conducted. If the battery input port is connected with the battery with reverse polarity or is not connected with the battery and the like, and cannot normally supply power, the collector and the emitter of the light receiving body of the first optical coupling unit are turned off, and the light emitting diode of the second optical coupling unit is turned off. On the basis of the conduction of the light emitting diode of the second optocoupler unit, the collector and the emitter of the light receiving body of the second optocoupler unit are conducted, driving current passes through between the first connecting end and the second connecting end of the switch unit, conduction between the second connecting end and the third connecting end of the switch unit is facilitated, a relay control signal is transmitted to the first signal control end and the second signal control end of the relay RY1, the first on-off connecting end and the second on-off connecting end are controlled to be connected, and direct current is finally provided to the outside through the output port.
IN fig. 3, if the relay control signal is correctly connected between ec+ and Ec-, the light emitting diode of the first optocoupler unit may be turned on, and if bat_in+ is used as the first battery input port to connect the positive electrode of the battery, and bat_in-is used as the second battery input port to connect the negative electrode of the battery (i.e. the battery polarity is correctly connected to the battery input port), at this time, the switch unit may be turned on, and finally, the relay RY1 is controlled to pass through the relay control signal between pin 3 and pin 4, and the relay RY1 is controlled to pass through between pin 1 and pin 2, and the battery finally provides direct current to the outside through bat+ and BAT-.
Optionally, in combination with any one of the foregoing aspects, referring to fig. 4, a cathode of the light emitting diode of the first optocoupler unit is connected to the second control signal port through a first resistor R1, and an anode of the light emitting diode of the second optocoupler unit is connected to an emitter of the light receiving body of the first optocoupler unit through a second resistor R2.
In fig. 4, the first optocoupler unit may be understood as a first optocoupler U1 and the second optocoupler unit may be understood as a second optocoupler U2. The first photo-coupler U1 and the second photo-coupler U2 can select specific types of photo-couplers according to actual needs, and the first resistor R1 and the second resistor R2 can select specific types of resistors or combinations of multiple resistors according to actual needs. In the first photocoupler U1 and the second photocoupler U2, pin 1 may be understood as an anode of the light emitting diode, pin 2 may be understood as a cathode of the light emitting diode, pin 3 may be understood as an emitter of the light receiver, and pin 4 may be understood as a collector of the light receiver. The first resistor R1 and the second resistor R2 are used for controlling the conduction of the first photo coupler U1, and the second resistor R2 can also play a role in limiting the battery leakage current.
IN the implementation, BAT_IN+ is connected with the positive electrode of the battery, BAT_IN-is connected with the negative electrode of the battery, at this time, if a normal relay control signal is connected between ec+ and Ec-, the No. 1 pin and the No. 2 pin of the first photoelectric coupler U1 are conducted, and then the No. 3 pin and the No. 4 pin of the first photoelectric coupler U1 are conducted, so that the No. 1 pin and the No. 2 pin of the second photoelectric coupler U2 are conducted, and thus, a driving current passes between the first connection end and the second connection end of the switch unit, conduction between the second connection end and the third connection end of the switch unit is facilitated, and accordingly, the conduction between the No. 3 pin and the No. 4 pin of the relay RY1 is controlled, the conduction between the No. 1 pin and the No. 2 pin of the relay RY1 is controlled, and finally direct current is provided through BAT+ and BAT-.
Optionally, in combination with any one of the foregoing aspects, in another implementation manner of the present aspect, the outputting, according to the polarity of the battery input voltage and the relay control signal, a driving signal includes:
when the relay control signal is an effective signal and the polarity of the battery input voltage is consistent with the conduction direction of the light emitting diode of the second optocoupler unit, the driving signal controls the switch unit to be conducted; otherwise, the switching unit is turned off.
In the embodiment, the relay control signal may be a high level signal when the relay control signal is an active signal. When any situation that the relay control signal does not exist, the relay control signal does not meet the level requirement, the input voltage does not exist, the polarity of the battery input voltage is inconsistent with the conduction direction of the light emitting diode of the second optocoupler unit exists, the light-on unit is turned off.
Optionally, in combination with any one of the foregoing aspects, in another implementation manner of this aspect, referring to fig. 5, the switching unit includes a triode, a third resistor R3, and a fourth resistor R4;
the base electrode of the triode is connected with the driving signal output end through the third resistor R3;
the collector electrode of the triode is connected with the second signal control end of the relay RY 1;
the emitter of the triode is connected with a second control signal port of the relay control signal input port;
the fourth resistor R4 is connected between the base electrode of the triode and the second control signal port.
It is understood that the transistor may be an NPN transistor or a PNP transistor. The triode can select a specific model according to actual needs, and the third resistor R3 and the fourth resistor R4 can select resistors of specific models or combinations of a plurality of resistors according to actual needs. The second resistor R2 and the third resistor R3 and the fourth resistor R4 together form an operation control condition of the second photocoupler U2.
In a specific embodiment, if the connection of the positive electrode and the negative electrode of the battery connected to the battery input port is correct, when the control signal of the relay between ec+ and Ec-, the triode is conducted under the action of the driving signal, so that the coil controlling the relay RY1 is electrified, the contact 1 and the contact 2 of the relay RY1 are switched on, and the relay RY1 works normally. Control sequence please refer to fig. 6, each working state is described as follows: i represents that when the control signal of the relay is effective but the anode and the cathode of the battery are reversely connected, the relay does not work; II indicates that when the control signal of the relay is effective and the anode and the cathode of the battery are normally connected, the relay can normally work; III indicates that when the relay has no control signal and the anode and the cathode of the battery are normally connected, the relay does not work; IV indicates that when the relay has no control signal and the anode and the cathode of the battery are reversely connected, the relay does not work. The relay control signal is interlocked with the function of correctly installing the anode and the cathode of the battery, and when the relay control signal is effective, the circuit can automatically identify the anode and the cathode of the battery. If the polarity of the battery is correctly connected, the relay can be normally closed, and if the anode and the cathode of the battery are reversely connected, the relay is required to be ensured not to be closed. By adopting the relay as the battery reverse connection preventing circuit, the leakage current of the battery passing through the system can be ensured to be not more than 1mA, so that the leakage current of the battery can be ensured to be controlled within 1mA when the system does not work. When the battery is applied to a motor home scene, when the motor home is in the open air for a long time, the endurance of the battery can be further prolonged.
Alternatively, in another implementation manner of the present aspect, referring to fig. 7, the battery input port includes a first battery input port and a second battery input port;
the output ports comprise a first output port and a second output port;
the relay control signal input port comprises a first control signal port and a second control signal port;
the interlocking control module comprises a first control signal input end, a second control signal input end, a first battery connecting end, a second battery connecting end and a driving signal output end, wherein the first control signal input end is connected with the first control signal port, the second control signal input end is connected with the second control signal port, the first battery connecting end is connected with the first battery input port, and the second battery connecting end is connected with the second battery input port;
the relay RY2 comprises a first signal control end, a second signal control end, a first on-off connection end, a second on-off connection end, a third on-off connection end and a fourth on-off connection end, wherein the first signal control end is connected with the first control signal port, the first on-off connection end is connected with the first battery input port, and the second on-off connection end is connected with the first output port;
the switch unit comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the driving signal output end, the second connecting end is connected with the second signal control end, and the third connecting end is connected with the second control signal port;
the third disconnection terminal and the fourth disconnection terminal are connected between the second output port and the second battery input port.
It should be noted that, the signals between the first signal control terminal and the second signal control terminal of the relay RY2 herein control the on-off between the first on-off connection terminal and the second on-off connection terminal and the on-off between the third on-off connection terminal and the fourth on-off connection terminal at the same time. In fig. 7, pin 1 of relay RY2 represents a first on-off connection terminal, pin 2 represents a second on-off connection terminal, pin 3 represents a first signal control terminal, pin 4 represents a second signal control terminal, pin 5 represents a third on-off connection terminal, and pin 6 represents a fourth on-off connection terminal.
In another aspect of the present application, there is further provided a power converter, including a power conversion circuit and a battery anti-reverse connection circuit as described in any one of the above;
the power conversion circuit is connected with the battery through the battery reverse connection preventing circuit.
In the process of connecting the battery, if the polarity of the battery is reversed, the battery reverse connection preventing circuit can control the battery to be in a disconnected state with the power converter, so that components in the power converter can be effectively protected, and meanwhile, a user can be instructed to be in a reverse connection state at present, and the positive electrode and the negative electrode of the battery need to be reconnected.
Optionally, in combination with any one of the foregoing aspects, in another implementation manner of the present aspect, the power conversion circuit is a dc-dc conversion circuit or a dc-ac conversion circuit, and may also be a multi-stage conversion circuit that is formed by at least one dc-dc conversion circuit and at least one dc-ac conversion circuit.
In yet another aspect of the present application, there is provided a power supply system, including a battery, a load, and a power converter as set forth in any one of the above;
the battery supplies power to the load through the power converter.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
In this application, the same or similar term concept, technical solution, and/or application scenario description will generally be described in detail only when first appearing, and when repeated later, for brevity, will not generally be repeated, and when understanding the content of the technical solution of the present application, etc., reference may be made to the previous related detailed description thereof for the same or similar term concept, technical solution, and/or application scenario description, etc., which are not described in detail later.
In this application, the descriptions of the embodiments are focused on, and the details or descriptions of one embodiment may be found in the related descriptions of other embodiments.
The technical features of the technical solutions of the present application may be arbitrarily combined, and for brevity of description, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (10)
1. A reverse connection preventing circuit for a battery, comprising: the device comprises a battery input port, a relay control signal input port, an interlocking control module, a switch unit, a relay and an output port;
the interlocking control module is connected with the battery input port and the relay control signal input port, and is used for receiving the battery input voltage of the battery input port and the relay control signal of the relay control signal input port and outputting a driving signal according to the polarity of the battery input voltage and the relay control signal;
the switch unit is connected with the interlocking control module and is turned on or turned off according to the driving signal;
the switch unit is also connected with the relay control signal input port and the relay, the relay is connected with the battery input port and the output port, and when the switch unit is conducted, the relay control signal of the relay control signal input port controls the relay to work so as to conduct the battery input port and the output port.
2. The battery anti-reverse connection circuit of claim 1, wherein the battery input port comprises a first battery input port and a second battery input port;
the output ports comprise a first output port and a second output port;
the relay control signal input port comprises a first control signal port and a second control signal port;
the interlocking control module comprises a first control signal input end, a second control signal input end, a first battery connecting end, a second battery connecting end and a driving signal output end, wherein the first control signal input end is connected with the first control signal port, the second control signal input end is connected with the second control signal port, the first battery connecting end is connected with the first battery input port, and the second battery connecting end is connected with the second battery input port;
the relay comprises a first signal control end, a second signal control end, a first on-off connection end and a second on-off connection end, wherein the first signal control end is connected with the first control signal port, the first on-off connection end is connected with the first battery input port, and the second on-off connection end is connected with the first output port;
the switch unit comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the driving signal output end, the second connecting end is connected with the second signal control end, and the third connecting end is connected with the second control signal port;
the second output port is connected with the second battery input port.
3. The battery anti-reverse connection circuit of claim 2, wherein the interlock control module comprises a first optocoupler unit and a second optocoupler unit;
the light emitting diode of the first optocoupler unit is connected between a first control signal port and a second control signal port of the relay control signal input port;
the collector electrode of the light receiving body of the first optocoupler unit is connected with a first battery input port of the battery input port and a first on-off connection end of the relay;
the light emitting diode of the second optical coupling unit is connected between the emitter of the light receiving body of the first optical coupling unit and the second battery input port of the battery input port;
and the collector of the light receiving body of the second optical coupler unit is connected with the first control signal port of the relay control signal input port, and the emitter of the light receiving body of the second optical coupler unit is used as the driving signal output end to be connected with the first connecting end of the switch unit.
4. The battery anti-reverse connection circuit according to claim 3, wherein a cathode of the light emitting diode of the first optocoupler unit is connected to the second control signal port through a first resistor, and an anode of the light emitting diode of the second optocoupler unit is connected to an emitter of the light receiving body of the first optocoupler unit through a second resistor.
5. The battery anti-reverse connection circuit according to claim 3, wherein the outputting of the driving signal according to the polarity of the battery input voltage and the relay control signal comprises:
when the relay control signal is an effective signal and the polarity of the battery input voltage is consistent with the conduction direction of the light emitting diode of the second optocoupler unit, the driving signal controls the switch unit to be conducted; otherwise, the switching unit is turned off.
6. The reverse connection preventing circuit for a battery according to any one of claims 2 to 4, wherein the switching unit includes a triode, a third resistor, and a fourth resistor;
the base electrode of the triode is connected with the driving signal output end through the third resistor;
the collector electrode of the triode is connected with the second signal control end of the relay;
the emitter of the triode is connected with a second control signal port of the relay control signal input port;
the fourth resistor is connected between the base electrode of the triode and the second control signal port.
7. The battery anti-reverse connection circuit of claim 1, wherein the battery input port comprises a first battery input port and a second battery input port;
the output ports comprise a first output port and a second output port;
the relay control signal input port comprises a first control signal port and a second control signal port;
the interlocking control module comprises a first control signal input end, a second control signal input end, a first battery connecting end, a second battery connecting end and a driving signal output end, wherein the first control signal input end is connected with the first control signal port, the second control signal input end is connected with the second control signal port, the first battery connecting end is connected with the first battery input port, and the second battery connecting end is connected with the second battery input port;
the relay comprises a first signal control end, a second signal control end, a first on-off connection end, a second on-off connection end, a third on-off connection end and a fourth on-off connection end, wherein the first signal control end is connected with the first control signal port, the first on-off connection end is connected with the first battery input port, and the second on-off connection end is connected with the first output port;
the switch unit comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the driving signal output end, the second connecting end is connected with the second signal control end, and the third connecting end is connected with the second control signal port;
the third disconnection terminal and the fourth disconnection terminal are connected between the second output port and the second battery input port.
8. A power converter comprising a power conversion circuit and a battery anti-reverse circuit as claimed in any one of claims 1 to 7;
the power conversion circuit is connected with the battery through the battery reverse connection preventing circuit.
9. The power converter of claim 8, wherein the power conversion circuit is a dc-dc conversion circuit, a dc-ac conversion circuit, or a multi-stage conversion circuit consisting of at least one dc-dc conversion circuit and at least one dc-ac conversion circuit.
10. A power supply system comprising a battery, a load and a power converter as claimed in claim 8 or 9;
the battery supplies power to the load through the power converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223465873.9U CN219394446U (en) | 2022-12-21 | 2022-12-21 | Battery reverse connection preventing circuit, power converter and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223465873.9U CN219394446U (en) | 2022-12-21 | 2022-12-21 | Battery reverse connection preventing circuit, power converter and power supply system |
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| Publication Number | Publication Date |
|---|---|
| CN219394446U true CN219394446U (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223465873.9U Active CN219394446U (en) | 2022-12-21 | 2022-12-21 | Battery reverse connection preventing circuit, power converter and power supply system |
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| Country | Link |
|---|---|
| CN (1) | CN219394446U (en) |
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2022
- 2022-12-21 CN CN202223465873.9U patent/CN219394446U/en active Active
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