CN110661311A - Battery charging circuit and device - Google Patents
Battery charging circuit and device Download PDFInfo
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- CN110661311A CN110661311A CN201910892550.1A CN201910892550A CN110661311A CN 110661311 A CN110661311 A CN 110661311A CN 201910892550 A CN201910892550 A CN 201910892550A CN 110661311 A CN110661311 A CN 110661311A
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
Abstract
The invention provides a battery charging circuit and device, the battery charging circuit includes: the voltage transformation module, the first switch and the voltage feedback regulation module; the input of vary voltage module is used for connecting the power, the output of vary voltage module is connected with the first end of first switch, the second end of first switch is used for connecting the battery, the first input of voltage feedback regulation module is used for connecting the battery, the second input of voltage feedback regulation module is connected with the output of vary voltage module, the output of voltage feedback regulation module is connected with the regulation end of vary voltage module, when needing to charge for the battery, voltage feedback regulation module carries out feedback regulation with the output voltage to vary voltage module through the voltage of gathering the battery, so that the output voltage of vary voltage module and the voltage difference value of battery are in predetermineeing the threshold value within range, then switch on first switch, vary voltage module provides charging voltage for the battery, so that the battery charges, in order to prevent surge phenomenon.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a battery charging circuit and a battery charging device.
Background
As is known, when a dc power supply charges a battery, if a large voltage difference exists between the power supply and the battery, a large inrush current is generated at the moment of turning on the circuit, and the value of the inrush current is the ratio of the voltage difference to the equivalent series resistance of the connected loop. In most cases, when a large current is needed for power supply during normal operation, the equivalent resistance of the loop is required to be small, usually in the milliohm range, in order to reduce the resistance loss. The voltage difference between the power supply and the battery may be several volts or even dozens of volts, and surge current cannot be avoided without reducing the difference. Although the surge voltage is often generated only momentarily, the charging device may be easily damaged and the battery may be damaged due to the excessive surge current.
At present, the common anti-surge method is as follows: the voltage of the output power supply is adjusted by software and PWM technique to be close to or equal to the battery voltage, so called successive approximation of voltage. The method has the disadvantages of complicated regulation mode, long time for regulating the voltage and low efficiency.
Disclosure of Invention
In view of the above, it is necessary to provide a battery charging circuit and device that solve the problem that a large surge is likely to occur at the moment of charging a battery.
There is provided a battery charging circuit comprising: the voltage transformation module, the first switch and the voltage feedback regulation module; the input end of the voltage transformation module is used for being connected with a power supply, the output end of the voltage transformation module is connected with the first end of the first switch, the second end of the first switch is used for being connected with a battery, the first input end of the voltage feedback regulation module is used for being connected with the battery, the second input end of the voltage feedback regulation module is connected with the output end of the voltage transformation module, and the output end of the voltage feedback regulation module is connected with the regulation end of the voltage transformation module.
The voltage feedback adjusting module is used for collecting the voltage of the battery and adjusting the voltage output by the voltage transformation module according to the voltage of the battery, so that the difference value between the voltage output by the voltage transformation module and the voltage of the battery is within a preset range.
In one embodiment, the battery charging circuit further includes a first voltage comparator and a processing module, a first input terminal of the first voltage comparator is configured to be connected to the battery, a second input terminal of the first voltage comparator is configured to be connected to a first reference power source, an output terminal of the first voltage comparator is connected to a first input terminal of the processing module, and a first output terminal of the processing module is connected to a control terminal of the first switch; the first voltage comparator is used for outputting a first control signal when detecting that the voltage of the battery is greater than or equal to the voltage of the first reference power supply, and sending the first control signal to the processing module, and the processing module is used for controlling the first switch to be switched off after receiving the first control signal.
In one embodiment, the battery charging circuit further includes a second switch and a third switch, a first end of the second switch is used for being connected to the battery, a second end of the second switch is connected to the first input end of the voltage feedback adjustment module, a first end of the third switch is used for being connected to a second reference power supply, and a second end of the third switch is connected to the first input end of the voltage feedback adjustment module.
In one embodiment, the battery charging circuit further includes a control module, the control module is respectively connected to the control terminal of the second switch and the control terminal of the third switch, and the control module is configured to control the second switch to be turned on and the third switch to be turned off, or control the second switch to be turned off and the third switch to be turned on.
In one embodiment, the battery charging circuit further includes a voltage detection module and a processing module, an input end of the voltage detection module is used for being connected with the battery, the voltage detection module is connected with the processing module, and the processing module is respectively connected with a control end of the second switch and a control end of the third switch; the voltage detection module is used for collecting voltage signals of the battery and sending the voltage signals to the processing module, and the processing module is used for controlling the second switch to be switched on and the third switch to be switched off when receiving the voltage signals and controlling the third switch to be switched on and the second switch to be switched off after preset time intervals.
In one embodiment, the battery charging circuit further comprises a relay, a first contact of the relay is used for being connected with the battery, a second contact of the relay is used for being connected with a second reference power supply, and a common end of the relay is connected with the first input end of the voltage feedback regulation module.
In one embodiment, the battery charging circuit further includes a current detection module, the current detection module is configured to be connected to the battery, and the current detection module is configured to detect a charging current of the battery.
In one embodiment, the battery charging circuit further comprises a processing module, and the processing module is respectively connected with the current detection module and the control end of the first switch; the current detection module is used for sending the charging current to the processing module, the processing module is used for judging whether the charging current is larger than a preset current or not, and when the charging current is larger than the preset current, the first switch is controlled to be switched off.
In one embodiment, the voltage feedback regulation module comprises a second voltage comparator and a voltage regulator, a first input terminal of the second voltage comparator is used for being connected with the battery, a second input terminal of the second voltage comparator is connected with an output terminal of the voltage transformation module, an output terminal of the second voltage comparator is connected with an input terminal of the voltage regulator, and an output terminal of the voltage regulator is connected with a regulation terminal of the voltage transformation module.
A battery charging apparatus comprising a battery charging circuit as described in any of the above embodiments.
Above-mentioned battery charging circuit and device, when need charge for the battery, voltage feedback adjustment module carries out feedback adjustment through the voltage of gathering the battery in order to the output voltage to vary voltage module, so that the output voltage of vary voltage module and the voltage difference value of battery are in presetting the within range, then switch on first switch, vary voltage module provides charging voltage for the battery, charge with the power supply battery, before the output of vary voltage module is connected with the battery promptly, the voltage difference of the voltage of the output of vary voltage module and battery has been set for presetting the within range automatically, in order to prevent the surge phenomenon, and because the voltage of vary voltage module output is automatic feedback adjustment, and convenient for operation can reduce voltage regulation time by 40%.
Drawings
FIG. 1 is a schematic diagram of a battery charging circuit according to one embodiment;
FIG. 2 is a circuit schematic of a battery charging circuit in one embodiment;
FIG. 3 is a schematic circuit diagram of a battery charging circuit in another embodiment;
FIG. 4 is a schematic circuit diagram of a battery charging circuit in yet another embodiment;
FIG. 5 is a schematic circuit diagram of a battery charging circuit in yet another embodiment;
fig. 6 is a circuit schematic of a battery charging circuit in yet another embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
For example, there is provided a battery charging circuit comprising: the voltage transformation module, the first switch and the voltage feedback regulation module; the input end of the voltage transformation module is used for being connected with a power supply, the output end of the voltage transformation module is connected with the first end of the first switch, the second end of the first switch is used for being connected with a battery, the first input end of the voltage feedback regulation module is used for being connected with the battery, the second input end of the voltage feedback regulation module is connected with the output end of the voltage transformation module, and the output end of the voltage feedback regulation module is connected with the regulation end of the voltage transformation module.
The voltage feedback adjusting module is used for collecting the voltage of the battery and adjusting the voltage output by the voltage transformation module according to the voltage of the battery, so that the difference value between the voltage output by the voltage transformation module and the voltage of the battery is within a preset range.
Above-mentioned battery charging circuit, when need charge for the battery, voltage feedback adjustment module carries out feedback adjustment through the voltage of gathering the battery in order to the output voltage to vary voltage module, so that the output voltage of vary voltage module and the voltage difference of battery are in presetting the within range, then switch on first switch, the vary voltage module provides charging voltage for the battery, charge with the power supply battery, before the output of vary voltage module is connected with the battery promptly, the voltage of vary voltage module output and the voltage difference of battery have been set for in presetting the within range automatically, in order to prevent surge phenomenon, and because the voltage of vary voltage module output is automatic feedback adjustment, high durability and convenient operation, response time is fast.
In one embodiment, referring to fig. 1, a battery charging circuit 10 includes: the voltage transformation module 100, the first switch 310 and the voltage feedback regulation module 200; the input end of the voltage transformation module 100 is used for connecting a power supply, the output end of the voltage transformation module 100 is connected with the first end of the first switch 310, the second end of the first switch 310 is used for connecting a battery, the first input end of the voltage feedback regulation module 200 is used for connecting the battery, the second input end of the voltage feedback regulation module 200 is connected with the output end of the voltage transformation module 100, and the output end of the voltage feedback regulation module 200 is connected with the regulation end of the voltage transformation module 100.
The voltage feedback adjusting module is used for collecting the voltage of the battery and adjusting the voltage output by the voltage transformation module according to the voltage of the battery, so that the difference value between the voltage output by the voltage transformation module and the voltage of the battery is within a preset range.
Specifically, the voltage feedback adjustment module 200 is configured to collect the voltage output by the voltage transformation module 100 and the voltage of the battery itself in real time, and perform feedback adjustment on the output voltage of the voltage transformation module 100 according to the voltage at two ends of the battery, so that the voltage output by the voltage transformation module 100 is close to or equal to the voltage of the battery, for example, the voltage feedback adjustment module 200 is configured to detect the voltage output by the voltage transformation module 100 and the voltage of the battery in real time, compare the voltage output by the voltage transformation module 100 with the voltage at two ends of the battery to output a corresponding voltage adjustment signal, output a voltage increase signal to increase the voltage output by the voltage transformation module 100 when the voltage at two ends of the battery is greater than the voltage output by the voltage transformation module 100, output a voltage decrease signal to decrease the voltage output by the voltage transformation module 100 so that the voltage output by the voltage transformation module 100 is close to or equal to the voltage at two ends of the battery, namely, the voltage outputted by the voltage transformation module can be automatically adjusted, and in one embodiment, the voltage adjustment signal is a PWM (Pulse-Width-Modulation) signal.
Specifically, after the voltage value output by the voltage transformation module 100 is close to or equal to the voltages at the two ends of the battery, that is, after the voltage output by the voltage transformation module 100 is regulated stably, the first switch 310 is turned on, so that the output end of the voltage transformation module 100 provides the charging voltage for the battery to charge the battery, and since the voltage value output by the voltage transformation module 100 is regulated to be close to or equal to the voltages at the two ends of the battery, the surge current can be avoided or reduced at the moment of turning on the circuit, and the charging circuit is prevented from being damaged or causing damage to the battery.
Above-mentioned battery charging circuit, when needing to charge for the battery, voltage feedback adjustment module 200 carries out feedback adjustment with the output voltage to vary voltage module 100 through the voltage of gathering the battery, so that the output voltage of vary voltage module 100 and the voltage difference value of battery are in presetting the within range, then switch on first switch 310, vary voltage module 100 provides charging voltage for the battery, so that the battery charges, before the output of vary voltage module is connected with the battery promptly, the voltage difference of the voltage of the output of vary voltage module and battery has been set for presetting the within range automatically, in order to prevent the surge phenomenon, and because the voltage of vary voltage module output is automatic feedback adjustment, high durability and convenient operation, response time is fast.
In order to avoid the overcharge phenomenon of the battery, in one embodiment, please refer to fig. 2, the battery charging circuit 10 further includes a first voltage comparator 510 and a processing module 400, a first input terminal of the first voltage comparator 510 is configured to be connected to the battery, a second input terminal of the first voltage comparator 510 is configured to be connected to a first reference power source 610, an output terminal of the first voltage comparator 510 is connected to a first input terminal of the processing module 400, and a first output terminal of the processing module 400 is connected to the control terminal of the first switch 310; the first voltage comparator 510 is configured to output a first control signal when detecting that the voltage of the battery is greater than or equal to the voltage of the first reference power supply 610, and send the first control signal to the processing module 400, where the processing module 400 is configured to control the first switch 310 to be turned off after receiving the first control signal. Specifically, a first input end of the first voltage comparator 510 is connected to the positive electrode of the battery, the first voltage comparator 510 is configured to collect a voltage of the battery and a voltage of the first reference power source 610, the first voltage comparator 510 is configured to compare a voltage value of the connection of the two input ends of the first voltage comparator, when the voltage of the battery is greater than the voltage of the first reference power source 610, it indicates that the battery is fully charged, the processing module 400 controls the first switch 310 to be turned off to cut off a power supply loop between the voltage transformation module 100 and the battery, that is, the voltage transformation module 100 stops providing power for the battery, so as to avoid an overcharge phenomenon of the battery. In one embodiment, the first voltage comparator 510 is configured to output a second control signal when detecting that the voltage of the battery is smaller than the voltage of the first reference power source 610, and send the second control signal to the processing module 400, and the processing module 400 controls the first switch 310 to be turned on after receiving the second control signal.
In order to provide a better charging voltage for the battery, in one embodiment, referring to fig. 3, the battery charging circuit 10 further includes a second switch 320 and a third switch 330, a first end of the second switch 320 is configured to be connected to the battery, a second end of the second switch 320 is connected to the first input end of the voltage feedback adjustment module 200, a first end of the third switch 330 is configured to be connected to a second reference power supply 620, and a second end of the third switch 330 is connected to the first input end of the voltage feedback adjustment module 200. Specifically, if the output voltage of the voltage transformation module 100 is adjusted by always using the voltage across the battery as a reference in the charging process of the battery, the voltage output by the voltage transformation module 100 is close to the voltage across the battery to charge the battery, and the charging efficiency is low, by providing the second switch 320 and the third switch 330, the second switch 320 is connected to the battery, the third switch 330 is connected to the reference power source, when the battery charging circuit is just connected to the battery, i.e. in the initial process of charging the battery, the second switch 320 is turned on, the third switch 330 is turned off, so that the battery charging circuit outputs a voltage close to or equal to the voltage across the battery to charge the battery, thereby reducing or avoiding the occurrence of surge current as much as possible, and in the normal charging process of the battery, the second switch 320 is turned off, the third switch 330 is turned on, so that the voltage output by the voltage transformation module 100 is close to the voltage of, to provide the required charging voltage for the battery to better charge the battery.
In one embodiment, the first switch, the second switch and the third switch may be one of a relay, a control switch, a triode and a field effect transistor.
In order to facilitate switching between the on and off states of the second switch and the third switch, in one embodiment, the battery charging circuit further includes a control module, the control module is respectively connected to the control end of the second switch and the control end of the third switch, and the control module is configured to control the second switch to be turned on and the third switch to be turned off, or control the second switch to be turned off and the third switch to be turned on. By arranging the control module, when a user needs to switch the states of the second switch and the third switch, the user only needs to control the on-off states of the second switch and the third switch through the control module, so that the user can conveniently switch the on-off states of the second switch and the third switch.
In order to better switch the states of the second switch 320 and the third switch 330, in one embodiment, referring to fig. 4, the battery charging circuit 10 further includes a voltage detection module 520 and a processing module 400, an input end of the voltage detection module 520 is used for being connected to the battery, the voltage detection module 520 is connected to the processing module 400, and the processing module 400 is respectively connected to a control end of the second switch 320 and a control end of the third switch 330; the voltage detection module 520 is used for collecting a voltage signal of the battery, and sending the voltage signal to the processing module 400, and the processing module 400 is used for controlling the second switch 320 to be switched on and the third switch 330 to be switched off when receiving the voltage signal, and controlling the third switch 330 to be switched on and the second switch 320 to be switched off after a preset time interval. Specifically, the voltage detection module 520 is configured to detect whether the battery is connected to the battery charging circuit, when the voltage detection module 520 detects a voltage signal of the battery, that is, it indicates that the battery is connected to the battery charging circuit, the voltage detection module 520 sends the detected voltage signal to the processing module 400, the processing module 400 controls the second switch 320 to be turned on and the third switch 330 to be turned off, so that the voltage output by the voltage transformation module 100 is adjusted to be close to or equal to the voltage at two ends of the battery, and after receiving the voltage signal, the processing module 400 switches the states of the second switch 320 and the third switch 330 at a preset time interval, so that the states of the second switch 320 and the third switch 330 can be automatically adjusted to provide the battery with the required charging voltage. In one embodiment, the voltage detection module 520 is an analog-to-digital converter.
In order to facilitate switching of the power supply to which the first input terminal of the voltage feedback regulation circuit is connected, in one embodiment, the battery charging circuit further comprises a relay, a first contact of the relay is used for being connected with the battery, a second contact of the relay is used for being connected with a second reference power supply, and a common terminal of the relay is connected with the first input terminal of the voltage feedback regulation module. Specifically, the first contact of the control relay is connected with the common terminal or the second contact of the control relay is connected with the common terminal, so that the first input terminal of the voltage feedback regulation module is connected with the battery, or the first input terminal of the voltage feedback regulation module is connected with the second reference power supply, and therefore the power supply connected with the first input terminal of the voltage feedback regulation circuit is convenient to switch.
In one embodiment, referring to fig. 5, the battery charging circuit 10 further includes a current detection module 700, where the current detection module 700 is configured to be connected to the battery, and the current detection module 700 is configured to detect a charging current of the battery. The current detection module is arranged to detect the charging current when the battery is charged so as to judge whether the charging process of the battery is abnormal or not.
In one embodiment, referring to fig. 5, the battery charging circuit 10 further includes a processing module 400, and the processing module 400 is connected to the current detection module 700 and the control terminal of the first switch 310 respectively; the current detection module 700 is configured to send the charging current to the processing module 400, and the processing module 400 is configured to determine whether the charging current is greater than a preset current, and control the first switch 310 to be turned off when the charging current is greater than the preset current. Specifically, when the current of the battery during the charging process is greater than the preset current, it indicates that there is an abnormal phenomenon, such as a short circuit or a battery damage, in the charging process of the battery, and if the battery continues to be charged, the battery and the battery charging circuit may be damaged, or even a fire may be caused, so that by providing the current detection module and the processing module 400, when the processing module 400 detects that the battery charging current is greater than the preset current, the first switch 310 is turned off, and the battery charging circuit is stopped to charge the battery, that is, the battery power supply loop is turned off, so as to improve the safety of the battery charging circuit.
In one embodiment, the processing module is further configured to determine whether the charging current is smaller than a preset threshold, and when the charging current is smaller than the preset threshold, control the first switch to be turned off, and then control the first switch to be turned on, so as to determine whether the battery is moved out of the battery charging circuit by determining whether the battery charging current detected by the current detection module changes.
In one embodiment, referring to fig. 5, the current detection module 10 includes a sampling resistor RS and an operational amplifier U1, a first output end of the voltage transformation module 100 is connected to a first end of a first switch 310, a second end of the first switch 310 is used for connecting an anode of the battery, a second output end of the voltage transformation module 100 is connected to the first end of the sampling resistor, a second end of the sampling resistor is used for connecting a cathode of the battery, a first end of the sampling resistor is connected to a first input end of the operational amplifier, a second end of the sampling resistor is connected to a second input end of the operational amplifier, an output end of the operational amplifier is connected to a third input end of the processing module 400, and a third output end of the processing module 400 is connected to a control end of the first switch 310. Specifically, the sampling resistor is arranged to collect the current during charging of the battery, and the collected current is amplified by the operational amplifier, so that the processing module 400 can better receive the charging current of the battery.
In one embodiment, the voltage feedback regulation module comprises a second voltage comparator and a voltage regulator, a first input terminal of the second voltage comparator is used for being connected with the battery, a second input terminal of the second voltage comparator is connected with an output terminal of the voltage transformation module, an output terminal of the second voltage comparator is connected with an input terminal of the voltage regulator, and an output terminal of the voltage regulator is connected with a regulation terminal of the voltage transformation module. Specifically, the input end of the second voltage comparator is respectively connected with the output end of the voltage transformation module and the battery, namely, the second voltage comparator collects the voltage output by the voltage transformation module and the voltages at two ends of the battery in real time and compares the voltages to output corresponding adjusting signals to be sent to the voltage regulator, and the voltage regulator regulates the voltage output by the voltage transformation module according to the received adjusting signals, so that the voltage output by the voltage transformation module is close to or equal to the voltages at two ends of the battery, namely, the charging voltage is close to the voltages at two ends of the battery, and the phenomenon of surge caused by overlarge voltage difference in the charging moment can be avoided. For example, when the voltage output by the voltage transformation module is greater than the voltage at two ends of the battery, the voltage regulator reduces the voltage output by the voltage transformation module according to the received regulating signal output by the second voltage comparator, and when the voltage output by the voltage transformation module is less than the voltage at two ends of the battery, the voltage regulator increases the voltage output by the voltage transformation module according to the received regulating signal output by the second voltage comparator, so as to realize feedback regulation of the voltage output by the voltage transformation module.
Referring to fig. 6, the battery charging circuit 10 includes: the voltage transformation module 100, the first switch 310, the voltage feedback adjustment module 200, the second switch 320, the third switch 330, the voltage detection module 520, the processing module 400, the sampling resistor RS and the operational amplifier U1, wherein the input end of the voltage transformation module 100 is used for connecting a power supply, the first output end of the voltage transformation module 100 is connected with the first end of the first switch 310, the second end of the first switch 310 is used for connecting with the positive electrode of a battery, the second output end of the voltage transformation module 100 is connected with the first end of the sampling resistor RS, the second end of the sampling resistor RS is used for connecting with the negative electrode of the battery, the first end of the sampling resistor RS is connected with the first input end of the operational amplifier U1, the second end of the sampling resistor RS is connected with the second input end of the operational amplifier U1, and the output end of the operational amplifier U1 is connected with the input end of the processing module 400, the output end of the processing module 400 is connected to the control end of the first switch 310, the second input end of the voltage feedback adjusting module 200 is connected to the first output end of the voltage transforming module 100, the output end of the voltage feedback adjusting module 200 is connected to the adjusting end of the voltage transforming module 100, the first end of the second switch 320 is used for being connected to the positive electrode of the battery, the second end of the second switch 320 is connected to the first input end of the voltage feedback adjusting module 200, the first end of the third switch 330 is used for being connected to the second reference power 620, the second end of the third switch 330 is connected to the first input end of the voltage feedback adjusting module 200, the input end of the voltage detecting module 520 is used for being connected to the positive electrode of the battery, the output end of the voltage detecting module 520 is connected to the input end of the processing module 400, and the output ends of the processing module 400 are respectively connected to the control end of the second switch 320 and the control end of the third switch 330 And the control end is connected.
In an embodiment, referring to fig. 6, the battery charging circuit further includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a resistor R6, a first output end of the voltage transformation module 100 is connected to a first end of the resistor R2 through the resistor R1, a second end of the resistor R2 is connected to a second input end of the voltage feedback adjustment module 200, a second end of the resistor R2 is connected to ground through the resistor R3, a second end of the second switch 320 is connected to a first input end of the voltage feedback adjustment module 200 through the resistor R5, a second end of the third switch 330 is connected to a first input end of the voltage feedback adjustment module 200 through the resistor R6, and the first input end of the voltage feedback adjustment module 200 is further connected to ground through the resistor R4. Specifically, by setting the voltage dividing circuit, the voltage dividing value of the output voltage of the voltage transformation module is connected to the first input end of the output voltage feedback regulation module, the voltage of the battery is connected to the second input end of the voltage feedback regulation module, and after the second switch is closed, the reference voltage is connected to the voltage dividing value of the battery voltage; the divided value of the output voltage of the voltage transformation circuit is a1, and the expression is:
A1＝(R1+R2)/R3 (1)
the divided value of the battery voltage is A2, and the expression is:
A2＝R5/R4 (2)
the output voltage V of the voltage transformation moduleOUTThe expression of (a) is:
VOUT＝VBATT*(1+A1)/(1+A2) (3)
wherein, VBATTIs the voltage of the battery.
The difference between the voltage output by the voltage transformation module and the voltage of the battery is Δ V, which is calculated in the following manner:
ΔV＝VOUT-VBATT＝VBATT*(A1-A2)/(1+A2) (4)
therefore, by adjusting the resistance values of the resistor R1, the resistor R2, the resistor R3, the resistor R4 and the resistor R5, the difference between the voltage output by the transformer module and the voltage of the battery is 0V or the voltage output by the transformer module is close to the voltage of the battery, that is, the instantaneous voltage difference of the battery charging circuit for charging the battery is 0V, so as to greatly reduce or avoid the occurrence of surge current at the moment of charging.
In one embodiment, there is provided a battery charging apparatus comprising the battery charging circuit described in any of the above embodiments, the battery charging circuit comprising: the voltage transformation module, the first switch and the voltage feedback regulation module; the input end of the voltage transformation module is used for being connected with a power supply, the output end of the voltage transformation module is connected with the first end of the first switch, the second end of the first switch is used for being connected with a battery, the first input end of the voltage feedback regulation module is used for being connected with the battery, the second input end of the voltage feedback regulation module is connected with the output end of the voltage transformation module, and the output end of the voltage feedback regulation module is connected with the regulation end of the voltage transformation module; the voltage feedback adjusting module is used for collecting the voltage of the battery and adjusting the voltage output by the voltage transformation module according to the voltage of the battery, so that the difference value between the voltage output by the voltage transformation module and the voltage of the battery is within a preset range.
Above-mentioned battery charging device when needs charge for the battery, voltage feedback adjustment module carries out feedback adjustment through the voltage of gathering the battery in order to the output voltage to vary voltage module to make the output voltage of vary voltage module and the voltage difference of battery in presetting the threshold value within range, then switch on first switch, vary voltage module provides charging voltage for the battery, so that the battery charges, thereby avoid the voltage difference between power supply and the battery too big, in order to prevent the surge phenomenon.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A battery charging circuit, comprising: the voltage transformation module, the first switch and the voltage feedback regulation module;
the input end of the voltage transformation module is used for being connected with a power supply, the output end of the voltage transformation module is connected with the first end of the first switch, the second end of the first switch is used for being connected with a battery, the first input end of the voltage feedback regulation module is used for being connected with the battery, the second input end of the voltage feedback regulation module is connected with the output end of the voltage transformation module, and the output end of the voltage feedback regulation module is connected with the regulation end of the voltage transformation module;
the voltage feedback adjusting module is used for collecting the voltage of the battery and adjusting the voltage output by the voltage transformation module according to the voltage of the battery, so that the difference value between the voltage output by the voltage transformation module and the voltage of the battery is within a preset range.
2. The battery charging circuit according to claim 1, further comprising a first voltage comparator and a processing module, wherein a first input terminal of the first voltage comparator is configured to be connected to the battery, a second input terminal of the first voltage comparator is configured to be connected to a first reference power source, an output terminal of the first voltage comparator is connected to a first input terminal of the processing module, and a first output terminal of the processing module is connected to a control terminal of the first switch;
the first voltage comparator is used for outputting a first control signal when detecting that the voltage of the battery is greater than or equal to the voltage of the first reference power supply, and sending the first control signal to the processing module, and the processing module is used for controlling the first switch to be switched off after receiving the first control signal.
3. The battery charging circuit of claim 1, further comprising a second switch and a third switch, wherein a first terminal of the second switch is configured to be connected to the battery, a second terminal of the second switch is connected to the first input terminal of the voltage feedback regulation module, a first terminal of the third switch is configured to be connected to a second reference power source, and a second terminal of the third switch is connected to the first input terminal of the voltage feedback regulation module.
4. The battery charging circuit of claim 3, further comprising a control module, wherein the control module is respectively connected to the control terminal of the second switch and the control terminal of the third switch, and the control module is configured to control the second switch to be turned on and the third switch to be turned off, or control the second switch to be turned off and the third switch to be turned on.
5. The battery charging circuit according to claim 3, further comprising a voltage detection module and a processing module, wherein an input terminal of the voltage detection module is connected to the battery, the voltage detection module is connected to the processing module, and the processing module is respectively connected to a control terminal of the second switch and a control terminal of the third switch; the voltage detection module is used for collecting voltage signals of the battery and sending the voltage signals to the processing module, and the processing module is used for controlling the second switch to be switched on and the third switch to be switched off when receiving the voltage signals and controlling the third switch to be switched on and the second switch to be switched off after preset time intervals.
6. The battery charging circuit of claim 1, further comprising a relay having a first contact for connection to the battery, a second contact for connection to a second reference power source, and a common terminal connected to the first input terminal of the voltage feedback regulation module.
7. The battery charging circuit of claim 1, further comprising a current detection module configured to be connected to the battery, the current detection module configured to detect a charging current of the battery.
8. The battery charging circuit of claim 7, further comprising a processing module, wherein the processing module is connected to the current detection module and the control terminal of the first switch respectively;
the current detection module is used for sending the charging current to the processing module, the processing module is used for judging whether the charging current is larger than a preset current or not, and when the charging current is larger than the preset current, the first switch is controlled to be switched off.
9. The battery charging circuit according to claim 1, wherein the voltage feedback regulation module comprises a second voltage comparator and a voltage regulator, a first input terminal of the second voltage comparator is configured to be connected to the battery, a second input terminal of the second voltage comparator is connected to an output terminal of the voltage transformation module, an output terminal of the second voltage comparator is connected to an input terminal of the voltage regulator, and an output terminal of the voltage regulator is connected to a regulation terminal of the voltage transformation module.
10. A battery charging apparatus comprising a battery charging circuit as claimed in any one of claims 1 to 9.
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