CN214590749U - Power supply circuit and terminal - Google Patents
Power supply circuit and terminal Download PDFInfo
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- CN214590749U CN214590749U CN202022909139.1U CN202022909139U CN214590749U CN 214590749 U CN214590749 U CN 214590749U CN 202022909139 U CN202022909139 U CN 202022909139U CN 214590749 U CN214590749 U CN 214590749U
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Abstract
The embodiment of the utility model provides a power supply circuit and terminal, this power supply circuit includes first power module, second power module and switch module; the output end of the first power supply module is connected with the first end of the switch module, and the output end of the second power supply module is connected with the second end of the switch module; the third end of the switch module is connected with a load; the switch module is used for controlling at any moment, and at least one power supply module in the first power supply module and the second power supply module supplies power to the load. Through setting up first power module and second power module for always there is at least one power module to supply power for the load at any moment, even because of the power shortage more new power module, also always can have at least one power module to supply power for the load, solved the problem that leads to the communication interrupt because of changing power supply in the communication process, thereby improved the continuity of communication.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a supply circuit and terminal.
Background
With the continuous development of wireless communication, the backpack communication equipment plays an extremely important role in emergency communication markets such as geological disaster relief, forest fire extinguishing, urban fire fighting, flood rescue and the like by virtue of the characteristics of small volume, easiness in carrying and the like, and due to the particularity of an application scene, how to supply power to the backpack communication equipment is crucial to guarantee the continuity of the communication.
In the prior art, when power is supplied to the backpack communication equipment, if a possible external power supply exists, the backpack communication equipment is supplied with power through the external power supply; on the contrary, if no external power supply is available, the lithium battery configured by the backpack communication device supplies power to the backpack communication device so as to provide the backpack communication device with required electric energy, thereby ensuring the continuity of communication.
However, for the backpack communication device, the volume of the lithium battery configured for the backpack communication device itself may not be too large, which means that the battery capacity of the lithium battery cannot meet the power supply requirement of long-time operation, and if the lithium battery needs to be replaced by a new lithium battery due to insufficient electric quantity in the communication process, the backpack communication device is powered off, and then service interruption is caused, and the continuity of communication is reduced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a supply circuit and terminal has solved in communication process, leads to the problem of business interruption because of changing power supply to the continuity of communication has been improved.
In a first aspect, an embodiment of the present invention provides a power supply circuit, the power supply circuit includes:
the power supply comprises a first power supply module, a second power supply module and a switch module; the output end of the first power supply module is connected with the first end of the switch module, and the output end of the second power supply module is connected with the second end of the switch module; and the third end of the switch module is connected with a load.
The switch module is configured to control at least one of the first power module and the second power module to supply power to the load at any time.
In one possible implementation, the switch module includes a first switch unit and a second switch unit.
The output end of the first power supply module is connected with the first end of the first switch unit, and the output end of the second power supply module is connected with the first end of the second switch unit.
The second end of the first switch unit and the second end of the second switch unit are both connected with the load.
In one possible implementation, the power supply circuit further includes a third switching unit.
The first end of the third switching unit is connected with an external power supply module, and the second end of the third switching unit is connected with the load.
In one possible implementation, the power supply circuit further includes a fourth switching unit.
The first end of the fourth switch unit is connected with an external power supply module, and the second end of the fourth switch unit is connected with the first power supply module.
In one possible implementation, the power supply circuit further includes a fifth switching unit.
The first end of the fifth switch unit is connected with an external power supply module, and the second end of the fifth switch unit is connected with the second power supply module.
In one possible implementation, the switching unit comprises a switching tube.
In a possible implementation manner, the switching tube is a diode, or the switching tube is a chip and a transistor; wherein the chip is connected to the transistor.
In a second aspect, an embodiment of the present invention provides a power supply terminal, including the power supply circuit and the load described in any one of the foregoing possible implementations of the first aspect; wherein the power supply circuit is used for supplying power to the load.
Therefore, the embodiment of the utility model provides a power supply circuit and terminal, when using this power supply circuit to supply power for the load in the backpack communication equipment, through making two power module of setting up first power module and second power module, make always have at least one power module to supply power for the load at any moment, even because of the not enough new lithium cell of replacement of electric quantity, also always have at least one power module to supply power for the load, improved power supply circuit's use duration; the problem of communication interruption caused by replacement of a power supply in the communication process is solved, and therefore the continuity of communication is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram of a frame of a power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit connection diagram of a power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of another power supply circuit according to an embodiment of the present invention;
fig. 4 is a schematic view of a voltage-current characteristic curve of a load in a power supply circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an internal circuit structure of a switching tube in a power supply circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a change of current and voltage when the lithium battery pack is charged according to an embodiment of the present invention.
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In the description of the present invention, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship.
The embodiment of the utility model provides a technical scheme can be applied to in backpack power supply unit's the use scene. With the continuous development of wireless communication, the backpack communication equipment plays an extremely important role in emergency communication markets such as geological disaster relief, forest fire extinguishing, urban fire fighting, flood rescue and the like by virtue of the characteristics of small volume, easiness in carrying and the like, and due to the particularity of an application scene, how to supply power to the backpack communication equipment is crucial to guarantee the continuity of the communication.
In the prior art, when power is supplied to the backpack communication equipment, if an external power supply is possible, the backpack communication equipment is supplied with power through the external power supply; on the contrary, if no external power supply is available, the lithium battery configured by the backpack communication device supplies power to the backpack communication device so as to provide the backpack communication device with required electric quantity, thereby ensuring the continuity of communication. However, for the backpack communication device, the volume of the lithium battery configured for the backpack communication device itself cannot be too large, which means that the battery capacity of the lithium battery cannot meet the power supply requirement of long-time operation, and if the lithium battery needs to be replaced by a new lithium battery due to insufficient electric quantity in the communication process, the backpack communication device is powered off, and further communication is interrupted, and the continuity of communication is reduced.
In order to solve the above problem, an embodiment of the present invention provides a power supply circuit and a terminal, in which, in consideration of the restriction of the volume of a battery on the electric quantity of the battery, two power modules, namely a first power module and a second power module, are adopted to supply power to a load; in addition, in order to avoid two power supply modules directly connected in parallel to supply power to the same load, the load can produce impulse current, and the power supply is interrupted, namely the problem that the backpack power supply equipment is damaged, the switch module is connected between the first power supply module and the load and between the second power supply module and the load, and at least one power supply module in the two power supply modules is ensured to supply power to the load, so that the service life of the backpack power supply equipment is prolonged, the power failure of the equipment can not be caused when the battery is replaced, and the continuity of communication is improved.
Based on the technical concept, an embodiment of the present invention provides a power supply circuit, which includes a first power module, a second power module, and a switch module; the output end of the first power supply module is connected with the first end of the switch module, and the output end of the second power supply module is connected with the second end of the switch module; the third end of the switch module is connected with a load; the switch module is used for controlling at any moment, and at least one power supply module in the first power supply module and the second power supply module supplies power to the load.
Therefore, use the embodiment of the utility model provides a supply circuit when supplying power for backpack communication equipment, through setting up first power module and second power module for there is at least one power module always to supply power for the load at any moment, even because of the not enough power supply module of renewal of change, also always can have at least one power module to supply power for the load, has solved the problem that leads to communication interruption because of changing power supply equipment among the communication process, thereby has improved the continuity of communication.
Hereinafter, the power supply circuit provided by the present invention will be described in detail by specific embodiments. It is to be understood that the following detailed description may be combined with other embodiments, and that the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic diagram of a frame of a power supply circuit according to an embodiment of the present invention. As shown in fig. 1, the embodiment of the present invention provides a power supply circuit, including: a first switch module 101, a second switch module 102, a switch module 103, and a load 104.
The output end of the first power supply module is connected with the first end of the switch module, and the output end of the second power supply module is connected with the second end of the switch module; the third end of the switch module is connected with a load; and the switch module is used for controlling at any moment, and at least one power supply module in the first power supply module and the second power supply module supplies power to the load.
Further, the switch module includes a first switch unit and a second switch unit; the output end of the first power supply module is connected with the first end of the first switch unit, and the output end of the second power supply module is connected with the first end of the second switch unit; the second end of the first switch unit and the second end of the second switch unit are both connected with a load. Wherein, first switch unit and second switch unit include the switch tube, and it can be the diode, also can be the mode that chip and transistor are connected, the embodiment of the utility model provides a do not specifically limit to the switch tube.
The technical solution of the present invention is described in detail by taking the switch tube as an example, and here, the embodiment of the present invention is only described by taking the diode as an example, but not limited thereto. Fig. 2 is a schematic circuit connection diagram of a power supply circuit according to an embodiment of the present invention. As shown in fig. 2, the first power module is BAT1, the second power module is BAT2, and the first switch unit and the second switch unit are diodes D1And a diode D2Let us assume a diode D1And a diode D2Be ideal diode, do not have forward voltage drop and direct current resistance, just the embodiment of the utility model provides a do not limit to the concrete type of diode.
Illustratively, the power supply circuit is used as a load RLWhen power is supplied, because the first power module and the second power module are two detachable power modules in the power supply circuit, when only the first power module BAT1 is installed in the circuit and the second power module BAT2 is not installed in the circuit, the first power module BAT1The output current flows through the diode D1Is a load RLSupplying power; wherein the load RLThe voltage at two ends is equal to the voltage at two ends of the first power module BAT1, the current of the load is equal to the internal current of the first power module BAT1, and the diode D1Are equal; on the contrary, when only the second power module BAT2 is installed in the circuit and the first power module BAT1 is not installed in the circuit, the output current of the second power module BAT2 flows through the diode D2Is a load RLSupplying power; wherein the load RLThe voltage at two ends is equal to the voltage at two ends of the second power module BAT2, the current of the load is equal to the internal current of the second power module BAT2, and the diode D2Are equal.
When the first power module BAT1 and the second power module BAT2 are installed in the power supply circuit at the same time, the load R is determined according to the voltage of the first power module BAT1 and the second power module BAT2LThe power supply condition of (1); if the voltages of the first power module BAT1 and the second power module BAT2 are equal, the two power modules simultaneously supply power to the load; at this time, the first power module BAT1 and the second power module BAT2 are simultaneously the load RLSupply, load RLThe voltages at the two ends, the voltage at the two ends of the first power module BAT1 and the voltage at the two ends of the second power module BAT2 are equal, and the diode D1And a diode D2Is equal, the currents of the first power module BAT1 and the second power module BAT2 are equal, and the load R isLThe current is twice of the output current of the first power module BAT1 and the output current of the second power module BAT 2; if the voltages of the first power module BAT1 and the second power module BAT2 are not equal, the power module with large voltage is the load R aloneLSupplying power until the voltages of the two power modules are equal, and simultaneously using the first power module BAT1 and the second power module BAT2 as a load RLSupplying power; wherein, the power module with large voltage is firstly used as the load R independentlyLDuring power supply, load RLThe voltage at both ends is equal to the voltage at both ends of the power module with larger voltage, and the load RLThe current of the power supply module with larger voltage is equal to the current of the diode connected with the power supply module with larger voltageWhen the voltage gradually decreases to the voltage of the two power modules is equal, the two power modules simultaneously supply power to the load, and the process is the same as the process of supplying power to the load when the voltage of the two power modules is equal, and is not repeated here.
For example, when the power supply circuit shown in fig. 2 is used to supply power to a load and a power module is under-voltage, that is, the power is insufficient, the under-voltage power module is determined according to the under-voltage warning information and replaced; which comprises the following steps: if the power supply circuit is only provided with the first power module BAT1 but not provided with the second power module BAT2, and receives the under-voltage warning information of the first power module BAT1, the second power module BAT2 with sufficient electric quantity is firstly arranged in the circuit, and at the moment, the second power module BAT2 is independently used as a load RLSupplying power, and disassembling the first power module BAT1 with undervoltage in the circuit; on the contrary, if the power supply circuit is only provided with the second power module BAT2 but not provided with the first power module BAT1, and receives the under-voltage warning information of the second power module BAT2, the first power module BAT1 with sufficient electric quantity is installed in the circuit, and at the moment, the first power module BAT1 is independently the load RLSupplying power, and detaching the under-voltage second power module BAT2 in the circuit; wherein, in order to guarantee that the use of circuit is long, can install the position of the power module under the dismantlement with the power module that the electric quantity is sufficient, realize that two power modules are load R simultaneouslyLThe power supply, whether can be according to actual need and decide to the position of installing the power module under the dismantlement with the sufficient power module of electric quantity, to this, the embodiment of the utility model provides a do not specifically limit.
If the first power module BAT1 and the second power module BAT2 are installed in the power supply circuit at the same time and the under-voltage warning information of the power modules is received, the two power modules are both the load R at the momentLWhen receiving the under-voltage warning information, the power supply module BAT1 and the second power module BAT2 are under-voltage, and at this time, one of the under-voltage power modules can be detached from the circuit at will, and the power module with sufficient electric quantity can be installed in the circuit, so that the power module with sufficient electric quantity is the load RLSupplying power; in addition, the device can also be used in combination withReplacing the other under-voltage power supply module; wherein, to the order of changing power module and whether all change two under-voltage power module and can select according to actual conditions, the embodiment of the utility model provides a do not specifically limit to this.
Wherein, power module's undervoltage warning information can be for sending sound warning information through backpack equipment, also can be for sending power module's undervoltage information through SMS, the mode of little letter, perhaps other modes that can guarantee in time to send power module undervoltage information, to the concrete mode who sends undervoltage warning information the embodiment of the utility model discloses do not any restriction.
Therefore, the embodiment of the present invention provides a power supply circuit, when using the first power module and the second power module to supply power to the load, through the first switch unit and the second switch unit, i.e. the diode D1And a diode D2The circuit is controlled, so that the first power supply module and the second power supply module can supply power to the load independently and can also supply power to the load simultaneously, and the service life of the power supply circuit is prolonged; in addition, through setting up first power module and second power module for always there is at least one power module to supply power for the load at any moment, even because of the power shortage more new power module, also always will have at least one power module to supply power for the load, solved the communication in-process because of changing the power supply equipment lead to the problem of communication interruption, thereby improved the continuity of communication.
Fig. 3 is a schematic circuit connection diagram of another power supply circuit according to an embodiment of the present invention. The embodiment of the utility model provides a power supply circuit still includes third unit switch, fourth switch unit and fifth switch unit, and wherein, the first end and the external power module of third switch unit are connected, and the second end and the load of third switch unit are connected; the first end of the fourth switch unit is connected with the external power supply module, and the second end of the fourth switch unit is connected with the first power supply module; the first end of the fifth switch unit is connected with the external power supply module, and the second end of the fifth switch unit is connected with the second power supply module. As shown in fig. 3, the external power module is DC, and the thirdThe switching unit being a diode D3One end of the DC power supply is connected with an external power supply module DC, and the other end of the DC power supply is connected with a load RLAnd (4) connecting.
For example, the external power module DC may be a charger or an adapter, and if the external power module DC is a charger, the charger is a fixed current type charger; if the external power supply module DC is an adapter, the adapter is a fixed voltage type adapter, and the specifications of the charger and the adapter need to be selected according to the characteristics of loads in the power supply circuit; the embodiment of the present invention is described by taking the external power module DC as an example of a charger, but the embodiment of the present invention is not limited thereto. According to fig. 3, the charger can charge the power module while supplying power to the load, assuming that the maximum value of the output voltage of the charger is VmaxThe maximum value of the output current is ImaxFig. 4 shows a current-voltage characteristic curve of the load, and fig. 4 is a schematic view of the current-voltage characteristic curve of the load of the power supply circuit according to the embodiment of the present invention. It can be seen from fig. 4 that the voltage value of the load is inversely proportional to the current value, i.e. the power of the load is constant, where IRL-minAnd IRL-maxRespectively the minimum current and the maximum current of the load.
As can be seen from fig. 3 and 4, in the use process of the power supply circuit, if the power module is not installed in the circuit, the output voltage of the charger is VmaxThe load current is the minimum current of the load; if the circuit is only provided with the first power module BAT1 and not provided with the second power module BAT2, the output current of the charger flows through the diode D3For supplying power to the load while the output current of the charger flows through the diode D4Charging the first power module BAT 1; in the process, the voltage of the first power supply module is continuously increased, the load current is continuously reduced along with the continuous increase of the voltage of the first power supply module, and the current of the first power supply module is the difference value between the maximum value of the output current of the charger and the load current, so that the charging current of the first power supply module is continuously increased until the voltage of the first power supply module is increased to the maximum value of the output voltage of the charger, the current of the first power supply module is reduced to 0, namely the charging current is completely reduced to 0In the charging process of the first power supply module, the charger only supplies power to the load at the moment, and the load current is the minimum current of the load.
If the circuit is only provided with the second power module BAT2 and not provided with the first power module BAT1, the output current of the charger flows through the diode D3For supplying power to the load while the output current of the charger flows through the diode D5Charging second power module BAT 2; in the process, the voltage of the second power supply module is continuously increased, the load current is continuously reduced along with the continuous increase of the voltage of the second power supply module, and the current of the second power supply module is the difference value between the maximum value of the output current of the charger and the load current, so that the charging current of the second power supply module is continuously increased until the voltage of the second power supply module is increased to the maximum value of the output voltage of the charger, the current of the second power supply module is reduced to 0, namely, the charging process of the second power supply module is completed, at the moment, the charger only supplies power to the load, and the load current is the minimum current of the load.
If the first power supply module BAT1 and the second power supply module BAT2 are installed in the circuit at the same time, determining the working process of the circuit according to the voltage values of the two voltage sources; if the voltage values of the two power supply modules are equal, the output current of the charger flows through the diode D3For supplying power to the load while the output current of the charger flows through the diode D4The first power module BAT1 is charged and the output current of the charger flows through the diode D5Charging second power module BAT 2; in the process, the voltages of the two power supply modules are continuously increased, the load current is continuously reduced along with the continuous increase of the voltages of the two power supply modules, and the currents of the first power supply module and the second power supply module are half of the difference value between the maximum value of the output current of the charger and the load current, so that the charging currents of the two power supply modules are continuously increased until the voltages of the two power supply modules are increased to the maximum value of the output voltage of the charger, the currents of the two power supply modules are reduced to 0, namely, the process of simultaneously charging the two power supply modules is completed, at the moment, the charger only supplies power to the load, and the load current is the minimum current of the load.
If the voltage values of the two power supply modules are not equal, the output of the chargerThe current flows through the diode D3Supplying power to a load, simultaneously, independently charging the power supply module with low voltage by the charger until the voltage values of the two power supply modules are equal, and simultaneously charging the two power supply modules by the charger; the charger charges the power supply modules with low voltage independently, the voltage of the power supply module with a small voltage value is increased continuously, the load current is reduced continuously along with the increase of the voltage, the current of the power supply module with a small voltage value is the difference value between the maximum value of the output current of the charger and the load current, so the charging current is increased continuously until the voltage of the power supply module is increased to be equal to the voltage of the power supply module with a large voltage value, and the charger charges the two power supply modules simultaneously; the charger is the process of two power module charging simultaneously can refer to the working process that the voltage of installing first power module BAT1 and second power module BAT2 and two power module equals in above-mentioned circuit simultaneously, the embodiment of the utility model provides a no longer describe to this repeatedly.
For example, the charger may charge the power module when no load is required to operate; if the circuit is only provided with the first power module BAT1 and not provided with the second power module BAT2, the charger charges the first power module BAT1, in the process, the current of the first power module BAT1 is the maximum value of the output current of the charger, the voltage of the first power module BAT1 is continuously increased until the voltage of the first power module BAT1 is increased to the maximum value of the output voltage of the charger, and the current of the first power module BAT1 is reduced to 0, so that the charging process of the first power module BAT1 is completed. If only install second power module BAT2 in the circuit and when not installing first power module BAT1, the charger charges for second power module BAT2, and its process is the same with the process of charging for first power module BAT1, the embodiment of the utility model discloses no longer describe to this.
If the first power supply module BAT1 and the second power supply module BAT2 are installed in the circuit at the same time, determining the working process of the charger according to the voltage values of the two voltage modules; if the voltage values of the two power supply modules are equal, the charger charges the two power supply modules at the same time; in the process, the voltages of the two power supply modules are gradually increased, the currents of the two power supply modules are half of the maximum value of the output current of the charger, and the charging process is completed until the voltages of the two power supply modules are increased to the maximum value of the output voltage of the charger. If the voltage values of the two power supply modules are not equal, the power supply module with the smaller voltage value is charged firstly until the voltage values of the two power supply modules are equal, and the two power supply modules are charged simultaneously; wherein, the in-process that charges for the power module that the voltage is low alone at the charger, the less power module's of magnitude of voltage electric current is charger output current's maximum value, increases to the magnitude of voltage that equals with the great power module of magnitude of voltage until its magnitude of voltage, and the charger charges for two power modules simultaneously, and its process can refer to above-mentioned two power module voltage isochronisms, and the charger is the process that two power modules charge, the embodiment of the utility model provides a no longer give unnecessary details to this.
In summary, when the power supply circuit with the external power module provided by the embodiment of the present invention is used to supply power to a load, the external power module can directly supply power to the load, so as to ensure that the load is not powered off, thereby avoiding the problem of signal interruption during the use of the backpack communication device; meanwhile, the first power supply module and the second power supply module can be charged, the electric quantity of the power supply modules is ensured to be sufficient, the time for replacing the power supply module for the power supply circuit when no external power supply module exists is saved, the backpack communication equipment is more practical, and the communication continuity of the backpack communication equipment is improved.
When the power supply circuit shown in fig. 3 is applied to a backpack communication device, wherein the first power module and the second power module may be 18650 lithium battery packs, the first switch unit, the second switch unit, the third switch unit, the fourth switch unit and the fifth switch unit may be a combination of a high-voltage ideal diode controller LTC4359 and an N-type Metal-Oxide Semiconductor Field Effect Transistor (MOSFET for short) shown in fig. 5, and the external power module is a charger. Fig. 5 is a schematic diagram of an internal circuit structure of a switching tube in a power supply circuit according to an embodiment of the present invention. As can be seen from fig. 5, compared with the case where the switch unit is a diode, the embodiment of the present invention further has a ground pin GND of the control chip, and the ground pin is grounded in the actual use process of the device, so as to ensure the safety of the device; in addition, the high voltage ideal diode controller LTC4359 controls the N type MOSFET to perform a low forward voltage diode function, which can ensure that it supplies current smoothly without oscillation.
Further, the voltage specification and the current specification of the charger are determined according to the rated voltage of the backpack communication equipment and the maximum power of the load; assuming that the rated voltage of the backpack communication device is DC24V, since the rated voltage of a single cell of a ternary lithium battery is 3.7V, it can be determined that the lithium battery pack in the power supply circuit is composed of 7 lithium batteries, and the revised rated voltage of the device is 7 × 3.7 — 25.9V; in addition, the maximum value of the output voltage of the lithium battery pack can be determined according to the conventional charging and discharging parameters of the lithium battery, namely the charging termination voltage is VmaxThe minimum value of the output voltage of the lithium battery pack, namely the discharge end voltage is V, which is 7 multiplied by 4.2 to 29.4VminWhen the voltage is 7 × 3, 21V, the maximum value of the output voltage of the charger is determined to be 29.4V; according to the minimum value V of the output voltage of the lithium battery packminAnd maximum power P of the loadmaxFrom formula IRL-max＝Pmax/VminThe maximum current value of the load can be determined, the maximum value of the output current of the charger needs to be larger than the maximum current value I of the loadRL-max. Suppose the maximum value of the charger output current ImaxIs the maximum current value I of the loadRL-max1.25 times of that of IRL-max＝0.8ImaxWherein, the volt-ampere characteristic of load is as shown in fig. 4, and the embodiment of the present invention is not repeated here.
It can be understood that when the backpack communication device is in a power-off state, a charger may be used to charge a lithium battery pack in the device; if only one lithium battery pack is installed in the equipment, the charging current of the lithium battery pack is the maximum value I of the output current of the chargermax(ii) a If two lithium battery packs are installed in the equipment, the charging current of the two lithium battery packs is one half of the maximum value of the output current of the charger, namely 0.5 Imax; in the process, the voltage of the lithium battery pack is gradually increased until the voltage reaches the chargerOutputting 29.4V of the voltage, thereby completing the charging process.
When backpack communication equipment is in the on state, the charger also supplies power for the load when charging for the lithium cell group in the equipment, and the change of voltage and electric current can participate in figure 6 among the lithium cell group charging process, and figure 6 is the utility model provides a current-voltage change schematic diagram when charging for the lithium cell group.
When only one lithium battery pack is mounted in the device as shown by the dotted line in fig. 6, it is understood that when the voltage of the lithium battery pack is the minimum value of the charger output voltage, the charging current value is 0.2 times the maximum value of the charger output current, i.e., Imax-IRL-max＝Imax-0.8Imax＝0.2ImaxThe voltage of the lithium battery pack gradually increases, and the charging current is the difference between the maximum value of the output current of the charger and the current value of the load, so that the charging current of the lithium battery pack continuously increases along with the reduction of the load current; and continuously increasing the voltage of the lithium battery pack until the voltage of the lithium battery pack reaches 29.4V, and reducing the charging current value to 0 to finish the charging process. It can be understood that, during the charging process, the specific charging current of the lithium battery pack is as follows: the charging current of its low pressure end is the difference between the maximum value of charger output current and the maximum current value of load, and the charging current of high-pressure end is the difference between the maximum value of charger output current and the minimum current value of load, the embodiment of the utility model provides an only use the whole charging current's of lithium cell group change to explain as the example, but does not represent the utility model provides an embodiment is only limited to this.
The solid line in fig. 6 represents the voltage and current variation of two lithium battery packs during charging when the two lithium battery packs are installed in the device and the voltage values of the two lithium battery packs are equal, and it can be known that, when the voltage of the two lithium battery packs is the minimum value of the output voltage of the charger, the charging current value of the two lithium battery packs is 0.1 times the maximum value of the output current of the charger, that is, (Imax-I)RL-max) When the voltage of the two lithium battery packs is gradually increased, the charging current of the two lithium battery packs is half of the difference between the maximum value of the output current of the charger and the current value of the load, therefore,the charging current of the two lithium battery packs is continuously increased along with the reduction of the load current; and continuously increasing the voltage of the two lithium battery packs until the voltage of the two lithium battery packs reaches 29.4V, and reducing the charging current value to 0 to finish the charging process. It can be understood that, during the charging process, the specific charging current of the two lithium battery packs is as follows: the charging current of its low pressure end is the half of the difference between the maximum value of charger output current and the maximum current value of load, and the charging current of high-pressure end is the half of the difference between the maximum value of charger output current and the minimum current value of load, the embodiment of the utility model provides an only explain as the example with the whole charging current's of lithium cell group change, but does not represent the utility model provides an embodiment is only limited to this.
Therefore, the embodiment of the utility model provides a through setting up two lithium cell groups for there is at least a set of lithium cell group at will always to supply power for the load, even because of the not enough new lithium cell group that updates of electric quantity, also always can have at least a set of lithium cell group to supply power for the load, has solved the problem that leads to backpack communication equipment's communication interrupt because of changing the lithium cell group among the communication process, thereby has improved the continuity of communication.
The embodiment of the utility model provides a still provide a power supply terminal, this terminal includes supply circuit and load in above-mentioned arbitrary embodiment, and it realizes that principle and beneficial effect are similar with supply circuit's realization principle and beneficial effect, can refer to supply circuit's realization principle and beneficial effect, and here is no longer repeated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. A power supply circuit, comprising:
the power supply comprises a first power supply module, a second power supply module and a switch module; the output end of the first power supply module is connected with the first end of the switch module, and the output end of the second power supply module is connected with the second end of the switch module; the third end of the switch module is connected with a load;
the switch module is used for controlling at any moment, and at least one power supply module of the first power supply module and the second power supply module supplies power to the load;
the power supply circuit further includes a third switching unit;
the first end of the third switching unit is connected with an external power supply module, and the second end of the third switching unit is connected with the load.
2. The circuit of claim 1,
the switch module comprises a first switch unit and a second switch unit;
the output end of the first power supply module is connected with the first end of the first switch unit, and the output end of the second power supply module is connected with the first end of the second switch unit;
the second end of the first switch unit and the second end of the second switch unit are both connected with the load.
3. The circuit of claim 2, wherein the power supply circuit further comprises a fourth switching unit;
the first end of the fourth switch unit is connected with an external power supply module, and the second end of the fourth switch unit is connected with the first power supply module.
4. The circuit of claim 2, wherein the power supply circuit further comprises a fifth switching unit;
the first end of the fifth switch unit is connected with an external power supply module, and the second end of the fifth switch unit is connected with the second power supply module.
5. The circuit according to any one of claims 1-4,
the switch unit comprises a switch tube.
6. The circuit of claim 5,
the switch tube is a diode, or the switch tube is a chip and a transistor; wherein the chip is connected to the transistor.
7. A terminal, comprising:
the supply circuit and load of any of claims 1-6 above; wherein the power supply circuit is used for supplying power to the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022909139.1U CN214590749U (en) | 2020-12-07 | 2020-12-07 | Power supply circuit and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022909139.1U CN214590749U (en) | 2020-12-07 | 2020-12-07 | Power supply circuit and terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214590749U true CN214590749U (en) | 2021-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022909139.1U Active CN214590749U (en) | 2020-12-07 | 2020-12-07 | Power supply circuit and terminal |
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| Country | Link |
|---|---|
| CN (1) | CN214590749U (en) |
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2020
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