CN110676894A - Charging circuit for storage battery - Google Patents
Charging circuit for storage battery Download PDFInfo
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- CN110676894A CN110676894A CN201810722442.5A CN201810722442A CN110676894A CN 110676894 A CN110676894 A CN 110676894A CN 201810722442 A CN201810722442 A CN 201810722442A CN 110676894 A CN110676894 A CN 110676894A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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Abstract
The invention discloses a storage battery charging circuit which comprises a charging power supply, a first switch unit, a second switch unit and a control unit, wherein the charging power supply is connected with a storage battery through the first switch unit to form a charging loop, and the storage battery and the second switch unit form a discharging loop; the control unit is respectively connected with the control end of the first switch unit and the control end of the second switch unit, outputs a composite pulse signal to the control end of the first switch unit and the control end of the second switch unit, and controls the first switch unit and the second switch unit to be switched on or switched off according to a preset time period; the control unit controls the output PWM signal to the first switch unit, controls the first switch unit to be intermittently and circularly conducted, and controls the charging loop to be intermittently and circularly conducted, so that the effect of removing sulfur in the charging process is achieved; and the second switch unit is controlled to conduct the discharging loop, and the polarization phenomenon of the storage battery in the charging process can be eliminated through the short discharging process.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a storage battery charging circuit.
Background
At present, the charging methods applied in the domestic industry mainly comprise the following methods:
1. constant voltage method. The charging method has the advantages that the charging current is automatically adjusted along with the change of the charge state of the storage battery; the charging current is very large at the initial stage of charging if the discharging depth of the storage battery is too deep, which not only endangers the safety of the charger, but also damages the battery due to overcurrent, and if the charging voltage is too low, the charging current is too small at the later stage, which results in overlong charging time.
2. Constant current method. The constant current method is a charging method in which a charging current is kept constant at all times during charging. In order to realize quick charging, a large current must be adopted for charging, so that a large amount of gassing of the storage battery is caused in the later charging period.
3. A step charging method. Including a two-stage charging method and a three-stage charging method. The two-stage charging method generally adopts a rapid charging method combining constant current and constant voltage. The charging is first carried out with a constant current to a predetermined voltage value, and then the remaining charging is carried out with a constant voltage. The two-stage switching voltage is generally the constant voltage of the second stage. The three-stage charging method is to use constant current at the beginning and end of charging and to charge with constant voltage in the middle. When the current decays to a predetermined value, the second phase is switched to the third phase. The method can attenuate the gassing amount to the minimum, but has the defects of long charging time, easy occurrence of side reactions such as thermal runaway, polarization and the like of the battery, and serious influence on the service life of the battery.
Therefore, the above charging methods all have disadvantages, so that the performance of the storage battery in the charging process is greatly reduced.
Disclosure of Invention
The invention mainly aims to provide a storage battery charging circuit, aiming at improving the performance of a storage battery in the charging process.
In order to achieve the above object, the present invention provides a battery charging circuit, which includes a charging power supply, a first switch unit, a second switch unit, and a control unit, wherein the charging power supply is connected to a battery through the first switch unit to form a charging circuit, and the battery and the second switch unit form a discharging circuit; the control unit is respectively connected with the control end of the first switch unit and the control end of the second switch unit, outputs a composite pulse signal to the control end of the first switch unit and the control end of the second switch unit, and controls the first switch unit and the second switch unit to be switched on or switched off according to a preset time period.
Preferably, the composite pulse signal is a periodic signal, and in one period of time, the control unit firstly controls to output the PWM signal in a first preset time period, then controls to output the single pulse signal in a second preset time period, and finally controls to output no signal in a third preset time period.
Preferably, the control unit comprises a first control unit and a second control unit, the first control unit is connected with the control end of the first switch unit, and the second control unit is connected with the control end of the second switch unit; the first control unit outputs a PWM signal to the control end of the first switch unit within a first preset time period, and no output is generated within a second preset time period and a third preset time period; the second control unit does not output in the first preset time period and the third preset time period, and outputs a single pulse signal to the second switch unit in the second time period.
Preferably, the first switch unit includes a first MOS transistor and a first diode, a gate of the first MOS transistor is connected to the output terminal of the first control unit as the control terminal of the first switch unit, a drain of the first MOS transistor is connected to the charging power supply, a source of the first MOS transistor is connected to an anode of the first diode, and a cathode of the first diode is connected to the battery.
Preferably, the second switch unit includes a second MOS transistor and a first resistor, a gate of the second MOS transistor is connected to the output terminal of the second control unit as a control terminal of the second switch unit, a drain of the second MOS transistor is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the battery, and a source of the second MOS transistor is connected to the other end of the battery.
Preferably, the battery charging circuit further comprises an isolation unit, and the isolation unit is respectively connected between the first control unit and the first switch unit, and between the second control unit and the second switch unit.
Preferably, the isolation unit includes an optocoupler, a first triode, a second triode, a third triode, a second resistor and a third resistor, an input end of the optocoupler is connected with an output end of the first control unit and an output end of the second control unit, another input end of the optocoupler is grounded, an output end of the optocoupler is connected with a working power supply, another output end of the optocoupler is connected with one end of a base of the first triode and one end of the second resistor, a collector of the first triode is connected with the working power supply, an emitter of the first triode is connected with a base of the second triode, a base of the third triode and one end of the third resistor, the other end of the second resistor is connected with the other end of the third resistor and grounded, a collector of the second triode is connected with the working power supply, and an emitter of the second triode is connected with an emitter of the third triode, The grid electrode of the first MOS tube is connected with the grid electrode of the second MOS tube, and the collector electrode of the third triode is connected with the source electrode of the first MOS tube and the source electrode of the second MOS tube and is grounded.
Preferably, the isolation unit further includes a fourth resistor and a fifth resistor, the fourth resistor is connected between the input end of the optocoupler and the output end of the first control unit and between the input end of the optocoupler and the output end of the second control unit, and the fifth resistor is connected between the output end of the optocoupler and the base of the first triode.
Preferably, the first MOS transistor and the second MOS transistor are both N-type MOS transistors, the first triode and the second triode are both NPN-type triodes, and the third triode is a PNP-type triode.
Preferably, the charging power supply is a constant current source.
According to the storage battery charging circuit, the control unit controls the output PWM signal to the control end of the first switch unit, the first switch unit is controlled to be conducted intermittently and circularly, and the charging loop is also conducted intermittently and circularly, so that the effect of removing sulfur in the charging process is achieved; and the duty ratio of the PWM signal output by the control unit can also be automatically controlled and adjusted, so that the charging current can be well adapted to different requirements of the rechargeable battery when the storage battery is in different charging stages, the charging current can be adjusted in time, the gassing of the battery is reduced, and the performance of the storage battery is improved. Through a short discharge process, the polarization phenomenon of the storage battery in the charging process can be eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a battery charging circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a battery charging circuit according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of the charging current of the battery charging circuit according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Charging power supply | D1 | |
| 200 | First switch unit | OT1、OT2 | |
| 300 | Storage battery | R9 | A |
| 400 | Second switch unit | R3、R7 | |
| 500 | Control unit | R4、R8 | Third resistance |
| 510 | A first control unit | R1、R5 | |
| 520 | Second control unit | R2、R6 | |
| 600 | Isolation unit | Q1、Q4 | A first triode |
| V1 | First MOS transistor | Q2、Q5 | Second triode |
| V2 | Second MOS transistor | Q3、Q6 | Third triode |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a storage battery charging circuit.
Referring to fig. 1 to 2, fig. 1 is a schematic block diagram of a battery charging circuit according to an embodiment of the present invention; FIG. 2 is a schematic circuit diagram of a battery charging circuit according to an embodiment of the present invention; FIG. 3 is a waveform diagram of the charging current of the battery charging circuit according to the present invention.
In the embodiment of the present invention, as shown in fig. 1, the battery charging circuit includes a charging power source 100, a first switch unit 200, a second switch unit 400, and a control unit 500, wherein the charging power source 100 is connected to a battery 300 through the first switch unit 200 to form a charging circuit, and the battery 300 and the second switch unit 400 form a discharging circuit; the control unit 500 is respectively connected to the control terminal of the first switch unit 200 and the control terminal of the second switch unit 400, and the control unit 500 outputs a composite pulse signal to the control terminal of the first switch unit 200 and the control terminal of the second switch unit 400 to control the first switch unit 200 and the second switch unit 400 to be turned on or off according to a preset time period.
In the present embodiment, the charging power supply 100 is preferably charged by a constant current power supply, and the charging current of the charging power supply 100 is in the range of 0.15C to 0.5C, where C is the capacity of the storage battery 300.
Specifically, in the charging loop, the positive output terminal of the charging power supply 100 is connected to the positive electrode of the storage battery 300 through the first switching unit 200, and accordingly the negative output terminal of the charging power supply 100 is connected to the negative electrode of the storage battery 300; when the control unit 500 controls the first switch unit 200 to be turned on, the charging loop is turned on, and the charging power supply 100 charges the storage battery 300; when the control unit 500 controls the first switching unit 200 to be turned off, the charging circuit is turned off, and the charging power supply 100 stops charging the secondary battery 300.
Generally, the control unit 500 continuously outputs the PWM signal to the control terminal of the first switching unit 200 within a continuous preset time period Tp, and controls the first switching unit 200 to intermittently and cyclically conduct according to the PWM duty ratio, so that the charging circuit is also intermittently and cyclically conducted. The charging of the storage battery 300 is controlled through the PWM signal, so that the sulfur removal effect is achieved; and the duty ratio of the PWM signal outputted by the control unit 500 can also be automatically controlled and adjusted, so that different requirements of the rechargeable battery when the storage battery 300 is in different charging stages can be well met, the charging current can be adjusted in time, battery gassing is reduced, and the performance of the storage battery 300 is improved.
In the discharging loop, two ends of the storage battery 300 are respectively connected with two ends of the second switching unit 400 located in the discharging loop, when the control unit 500 controls the second switching unit 400 to be turned on, the discharging loop is turned on, and the storage battery 300 is discharged through the second switching unit 400; when the control unit 500 controls the second switching unit 400 to be turned off, the discharging circuit is turned off and the battery 300 stops discharging. In the present embodiment, the discharge current of battery 300 does not exceed 0.8C.
Generally, after the aforementioned charging preset time Tp is reached, the control unit 500 then controls the second switch unit 400 to conduct for a preset time period Tn, which is generally short, in which the discharging circuit is conducted and the battery 300 is discharged through the second switch unit 400, and this short discharging process is used to eliminate the polarization phenomenon of the previous charging process.
Finally, the control unit 500 will control the first and second switch units 200, 400 to be turned off, and during this time period Tz, by detecting the electric quantity condition of the battery 300, it is determined whether to repeat the above whole process: when the electric quantity of the storage battery 300 is detected to reach a saturation state, controlling the whole charging process to be finished; when it is detected that the charge of the battery 300 is not in the saturated state, the control unit 500 controls the above process to be repeated until the charge of the battery 300 reaches the saturated state.
Specifically, in this embodiment, the composite pulse signal is a periodic signal, and in one period of time, the control unit 500 first controls to output the PWM signal for the first preset time period Tp, then controls to output the single pulse signal for the second preset time period Tn, and finally controls to output no signal for the third preset time period Tz.
In one period, first, in a first preset time period Tp, the first switching unit 200 is turned on according to a duty cycle of the PWM signal, and the second switching unit 400 is turned off; at this time, the charging circuit is periodically turned on according to the duty ratio of the PWM signal, and normally, when the PWM signal is at a high level, the first switching unit 200 is turned on, the charging circuit is turned on, and the charging power supply 100 charges the secondary battery 300; when the PWM signal is at the low level, the first switching unit 200 is turned off, the charging circuit is turned off, the charging power supply 100 stops charging the secondary battery 300, and the charging of the secondary battery 300 is continued by such an intermittent cycle until the first preset time period Tp is completed.
In this embodiment, the PWM signal preferably has a frequency range of 8400Hz ± 420Hz and a duty ratio of 20% to 80%.
Then, in a second preset time period Tn, the first switch unit 200 is turned off, and the second switch unit 400 is turned on; at this time, the charging circuit is turned off, the discharging circuit is turned on, and the battery 300 is discharged through the second switching unit 400 for eliminating the polarization phenomenon after the battery 300 is charged.
Finally, in a third preset time period Tz, the first switch unit 200 and the second switch unit 400 are both turned off. At this time, the electric quantity condition of the storage battery 300 is detected, and when the electric quantity of the storage battery 300 reaches a saturation state, the whole charging process is controlled to be finished; when it is detected that the charge of the storage battery 300 is not in the saturated state, the control unit 500 controls the above process to be repeated until the charge of the storage battery 300 is in the saturated state.
In this embodiment, the first preset time period Tp, the second preset time period Tn, and the third preset time period Tz constitute sequential continuous time periods, i.e., a complete time cycle. In general, the proportional relationship of the durations among the first preset time period Tp, the second preset time period Tn, and the third preset time period Tz satisfies the following: the duration of the first preset time period Tp is equal to the duration of the second preset time period Tn: the duration of the third preset time period Tz is 100 to (0.5-2): (2-6). In the present embodiment, the duration of the first preset time period Tp is preferably 500ms, the duration of the second preset time period Tn is preferably 5ms, and the duration of the third preset time period Tz is preferably 20 ms. A specific charging waveform diagram of battery 300 is shown in fig. 3.
Specifically, the control unit 500 includes a first control unit 510 and a second control unit 520, the first control unit 510 is connected to the control terminal of the first switch unit 200, and the second control unit 520 is connected to the control terminal of the second switch unit 400; the first control unit 510 outputs a PWM signal to the control terminal of the first switching unit 200 within a first preset time period Tp, and does not output the PWM signal within a second preset time period Tn and a third preset time period Tz; the second control unit 520 outputs no output during the first and third preset time periods Tp and Tz, and outputs a single pulse signal to the second switching unit 400 during the second time period.
In this embodiment, the control unit 500 is divided into two different signal generators, which respectively control the actions of the first switch unit 200 and the second switch unit 400, and continuously output corresponding control signals to the control terminals of the first switch unit 200 and the second switch unit 400 within a preset time period, so as to implement the aforementioned charging process.
Specifically, as shown in fig. 2, the first switch unit 200 includes a first MOS transistor V1 and a first diode D1, a gate of the first MOS transistor V1 is connected to the output terminal of the first control unit 510 as the control terminal of the first switch unit 200, a drain of the first MOS transistor V1 is connected to the charging power source 100, a source of the first MOS transistor V1 is connected to an anode of the first diode D1, and a cathode of the first diode D1 is connected to the secondary battery 300.
In this embodiment, the first MOS transistor V1 is preferably an N-type MOS transistor, and the gate is turned on at a high level; when the PWM signal output by the first control unit 510 is at a high level, the first MOS transistor V1 is turned on, and the positive electrode of the charging power supply 100, the drain electrode of the first MOS transistor V1, the source electrode of the first MOS transistor V1, the anode of the first diode D1, the cathode of the first diode D1, the positive electrode of the battery 300, the negative electrode of the battery 300, and the negative electrode of the charging power supply 100 are sequentially connected to form a charging loop, so that the battery 300 enters a charging state; when the PWM signal output by the first control unit 510 is at a low level, the first MOS transistor V1 is turned off, the charging circuit is disconnected, and the battery 300 stops charging.
According to the foregoing, in the first preset time period Tp, the first MOS transistor V1 is controlled by the PWM signal output by the first control unit 510, and the intermittent cycle is turned on and off, so that the charging power supply 100 is controlled to intermittently cycle to charge the storage battery 300, and in this way, the storage battery 300 achieves the effect of removing sulfur in the charging process, and the charging current can be timely adjusted by automatically controlling and adjusting the duty ratio of the PWM signal, so as to adapt to different requirements of the rechargeable battery when the storage battery 300 is in different charging stages, reduce battery gassing, and improve the performance of the storage battery 300. When the first preset time period Tp is over, the first control unit 510 controls to output a low level signal to the first MOS transistor V1, so that the first MOS transistor V1 is turned off, the charging circuit is disconnected, and the battery 300 stops charging.
The second switch unit 400 comprises a second MOS transistor V2 and a first resistor R9, the gate of the second MOS transistor V2 is connected with the output end of the second control unit 520 as the control end of the second switch unit 400, the drain of the second MOS transistor V2 is connected with one end of the first resistor R9, the other end of the first resistor R9 is connected with one end of the battery 300, and the source of the second MOS transistor V2 is connected with the other end of the battery 300.
In this embodiment, the second MOS transistor V2 also preferably adopts an N-type MOS transistor, and the gate is turned on at a high level; when the second control unit 520 outputs a high-level pulse signal, the gate of the second MOS transistor V2 is changed from a low level to a high level, the second MOS transistor V2 is turned on, the anode of the battery 300, the first resistor R9, the drain of the first MOS transistor V1, the source of the first MOS transistor V1, and the cathode of the battery 300 are sequentially connected to form a discharge loop, and the battery 300 enters a discharge state; when the pulse signal is transmitted, the gate of the second MOS transistor V2 is changed from high level to low level, the second MOS transistor V2 is turned off, the discharging circuit is disconnected, and the battery 300 stops discharging.
According to the foregoing, in the second preset time period Tn (the duration of the time period is the same as the duration of the pulse signal), the second MOS transistor V2 is firstly switched from the off state to the on state, and then the second MOS transistor V2 is controlled to be firstly switched from the on state to the off state, so as to control the battery 300 to discharge for a short time, so that the battery 300 can achieve the effect of eliminating the polarization phenomenon in the charging process.
After the battery 300 finishes the discharging operation, the battery enters a third preset time period Tz, at this time, the first control unit 510 and the second control unit 520 control to output a low level signal or no signal, the first MOS transistor V1 and the second MOS transistor V2 are both turned off, the charging loop and the discharging loop are both turned off, and at this time, the battery 300 is neither charged nor discharged and enters a maintenance state. During this period, whether to continue the cyclic charge may be determined by detecting the amount of charge of the secondary battery 300, specifically, the amount of charge of the secondary battery 300 has a one-to-one correspondence with the value of the output voltage, and the state of saturation of the amount of charge of the secondary battery 300 may be determined by detecting the voltage of the secondary battery 300.
Further, the battery charging circuit further includes an isolation unit 600, and the isolation unit 600 is respectively connected between the first control unit 510 and the first switch unit 200, and between the second control unit 520 and the second switch unit 400.
The isolation unit 600 may be provided as one or two, and this embodiment is described by taking two as an example, and the two isolation units are respectively connected between the first control unit 510 and the control terminal of the first switch unit 200, and between the second control unit 520 and the control terminal of the second switch unit 400, so that signals can only be transmitted in one direction, and interference of other signals is prevented.
Specifically, the isolation unit 600 includes an optical coupler (OT1, OT2), a first transistor (Q1, Q4), a second transistor (Q2, Q5), a third transistor (Q3, Q6), a second resistor (R3, R7), and a third resistor (R7, R7), one input end of the optical coupler (OT 7) is connected to the output end of the first control unit 510 and the output end of the second control unit 520, the other input end of the optical coupler (OT 7) is connected to ground, one output end of the optical coupler (OT 7) is connected to an operating power supply, the other output end of the optical coupler (OT 7) is connected to a base of the first transistor (Q7, Q7), one end of the second resistor (R7, R7), a collector of the first transistor (Q7, Q7) is connected to the operating power supply, and a base of the first transistor (Q7, Q7), an emitter of the second transistor (Q7, Q7) is connected to the base of the transistor 7, Q7, The base electrodes of third triodes (Q3, Q6) and one ends of third resistors (R4, R8) are connected, the other ends of the second resistors (R3, R7) are connected with the other ends of the third resistors (R4, R8) and grounded, the collector electrodes of the second triodes (Q2, Q5) are connected with a working power supply, the emitter electrodes of the second triodes (Q2, Q5) are connected with the third triodes (Q3, Q6), the grid electrode of a first MOS and the grid electrode of a second MOS tube V2, and the collector electrodes of the third triodes (Q3, Q6) are connected with the source electrode of the first MOS tube V1 and the source electrode of the second MOS tube V2 and grounded.
In this embodiment, the first transistor (Q1, Q4), the second transistor (Q2, Q5) are preferably NPN transistors, and the third transistor (Q3, Q6) is preferably PNP transistors.
Firstly, in a first preset time period Tp, when the PWM signal output by the first control unit 510 is at a high level, the light emitting diode on the input side of the opto-coupler OT1 is turned on, the phototriode on the output side of the opto-coupler OT1 is turned on, the base level of the first triode Q1 is quickly pulled high by the working power supply through the phototriode, the first triode Q1 is turned on, the level of the emitter of the first triode Q1 is also pulled high therewith, at this time, the second triode Q2 is turned on, the third triode Q3 is turned off, the gate of the first MOS transistor V1 is also pulled high by the working power supply through the second triode Q2, the first MOS transistor V1 is turned on, and the charging loop is turned on.
When the PWM signal output by the first control unit 510 is at a low level, the light emitting diode on the input side of the opto-coupler OT1 is turned off, the phototriode on the output side of the opto-coupler OT1 is turned off, the base level of the first triode Q1 is rapidly pulled down, the first triode Q1 is turned off, the level of the emitter of the first triode Q1 is also pulled down, the second triode Q2 is turned off at this time, the third triode Q3 is turned on, the collector of the third triode Q3 pulls down the gate of the first MOS transistor V1, the first MOS transistor V1 is turned off, and the charging circuit is turned off. During this preset time period, battery 300 performs an intermittent cyclic charging operation.
Then, in a second preset time period Tn, the first control unit 510 controls to output a low level, and the second control unit 520 controls to output a single pulse signal, and according to the above analysis, the charging circuit is disconnected, and the discharging circuit is firstly connected and then disconnected, so that the battery 300 performs a short discharging operation in this preset time period.
Through the design of the isolation unit 600, the charging and discharging processes of the storage battery 300 are accurate, and are not interfered by other signals.
Further, the isolation unit 600 further includes a fourth resistor (R1, R5) and a fifth resistor (R2, R6), the fourth resistor (R1, R5) is connected between the input terminal of the optocoupler (OT1, OT2) and the output terminal of the first control unit 510 and between the input terminal of the optocoupler (OT1, OT2) and the output terminal of the second control unit 520, and the fifth resistor (R2, R6) is connected between the output terminal of the optocoupler (OT1, OT2) and the base of the first triode (Q1, Q4).
The fourth resistor (R1, R5) and the fifth resistor (R2, R6) are used for limiting current, and the phenomenon that an overlarge current impacts a circuit and parts in the circuit are burnt out is prevented.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The storage battery charging circuit is characterized by comprising a charging power supply, a first switch unit, a second switch unit and a control unit, wherein the charging power supply is connected with a storage battery through the first switch unit to form a charging loop, and the storage battery and the second switch unit form a discharging loop; the control unit is respectively connected with the control end of the first switch unit and the control end of the second switch unit, outputs a composite pulse signal to the control end of the first switch unit and the control end of the second switch unit, and controls the first switch unit and the second switch unit to be switched on or switched off according to a preset time period.
2. The battery charging circuit according to claim 1, wherein the composite pulse signal is a periodic signal, and the control unit sequentially outputs the PWM signal for a first preset time period, the single pulse signal for a second preset time period, and no output signal for a third preset time period within one period time.
3. The battery charging circuit according to claim 2, wherein the control unit comprises a first control unit and a second control unit, the first control unit being connected to the control terminal of the first switching unit, the second control unit being connected to the control terminal of the second switching unit; the first control unit outputs a PWM signal to the control end of the first switch unit within a first preset time period, and no output is generated within a second preset time period and a third preset time period; the second control unit does not output in the first preset time period and the third preset time period, and outputs a single pulse signal to the second switch unit in the second time period.
4. The battery charging circuit according to claim 3, wherein the first switching unit comprises a first MOS transistor and a first diode, a gate of the first MOS transistor is connected to the output terminal of the first switching unit as the control terminal of the first switching unit, a drain of the first MOS transistor is connected to the charging power source, a source of the first MOS transistor is connected to an anode of the first diode, and a cathode of the first diode is connected to the battery.
5. The battery charging circuit according to claim 4, wherein the second switching unit comprises a second MOS transistor and a first resistor, a gate of the second MOS transistor is connected to the output terminal of the second switching unit as a control terminal of the second switching unit, a drain of the second MOS transistor is connected to one terminal of the first resistor, the other terminal of the first resistor is connected to one terminal of the battery, and a source of the second MOS transistor is connected to the other terminal of the battery.
6. The battery charging circuit according to claim 5, further comprising isolation units connected between the first control unit and the first switching unit, and between the second control unit and the second switching unit, respectively.
7. The battery charging circuit according to claim 6, wherein the isolation unit comprises an optocoupler, a first transistor, a second transistor, a third transistor, a second resistor, and a third resistor, wherein an input terminal of the optocoupler is connected to an output terminal of the first control unit and an output terminal of the second control unit, another input terminal of the optocoupler is grounded, one output terminal of the optocoupler is connected to the operating power supply, another output terminal of the optocoupler is connected to a base of the first transistor and one end of the second resistor, a collector of the first transistor is connected to the operating power supply, an emitter of the first transistor is connected to a base of the second transistor, a base of the third transistor and one end of the third resistor, another end of the second resistor is connected to another end of the third resistor and grounded, and a collector of the second transistor is connected to the operating power supply, and the emitter of the second triode is connected with the emitter of the third triode, the grid of the first MOS and the grid of the second MOS tube, and the collector of the third triode is connected with the source of the first MOS tube and the source of the second MOS tube and is grounded.
8. The battery charging circuit of claim 7, wherein the isolation unit further comprises a fourth resistor and a fifth resistor, the fourth resistor is connected between the input of the optocoupler and the output of the first control unit and between the input of the optocoupler and the output of the second control unit, and the fifth resistor is connected between the output of the optocoupler and the base of the first transistor.
9. The battery charging circuit according to claim 8, wherein the first and second MOS transistors are both N-type MOS transistors, the first and second transistors are both NPN-type transistors, and the third transistor is a PNP-type transistor.
10. The battery charging circuit according to any of claims 1 to 9, wherein the charging power source is a constant current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810722442.5A CN110676894A (en) | 2018-07-03 | 2018-07-03 | Charging circuit for storage battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810722442.5A CN110676894A (en) | 2018-07-03 | 2018-07-03 | Charging circuit for storage battery |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1531164A (en) * | 2003-03-12 | 2004-09-22 | 三美电机株式会社 | Charging method of secondary battery and device therefor |
| CN101635470A (en) * | 2009-08-19 | 2010-01-27 | 王广生 | Quick charger of power-saving storage battery and intelligent charging method |
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2018
- 2018-07-03 CN CN201810722442.5A patent/CN110676894A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1531164A (en) * | 2003-03-12 | 2004-09-22 | 三美电机株式会社 | Charging method of secondary battery and device therefor |
| CN101635470A (en) * | 2009-08-19 | 2010-01-27 | 王广生 | Quick charger of power-saving storage battery and intelligent charging method |
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