CN214227916U - Resistance-capacitance step-down charging circuit - Google Patents
Resistance-capacitance step-down charging circuit Download PDFInfo
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- CN214227916U CN214227916U CN202023001461.0U CN202023001461U CN214227916U CN 214227916 U CN214227916 U CN 214227916U CN 202023001461 U CN202023001461 U CN 202023001461U CN 214227916 U CN214227916 U CN 214227916U
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Abstract
The utility model discloses a resistance-capacitance step-down charging circuit, including rechargeable battery, charging circuit and filter circuit, wherein, charging circuit includes bridge rectifier, first electric capacity, first resistance and second resistance, and first resistance and second resistance are established ties and are connected between input and bridge rectifier, and first electric capacity is parallelly connected with first resistance and second resistance. When the electricity is mended after the rechargeable battery degree of depth is discharged, can reduce the alternating voltage of charging circuit input to lower magnitude of voltage, utilize the characteristic of first electric capacity, after the alternating voltage of reduction input, make first electric capacity have relatively less charging current, and enough activation rechargeable battery, adopt less electric current to activate rechargeable battery after the overdischarge promptly, the risk of the easy explosion of electric capacity has been reduced, need not dismantle or change rechargeable battery, promote the security and reduce cost of maintenance, make the product resume use value.
Description
Technical Field
The utility model belongs to the technical field of the circuit technique and specifically relates to a resistance-capacitance step-down charging circuit is related to.
Background
In the existing electric appliance products using resistance-capacitance voltage reduction charging, the electric quantity of the battery is reduced after the products are stored for 6-12 months due to self-discharge of lead-acid batteries and electric leakage of the products, and the condition of internal resistance increase or discharge can occur; when normal alternating current AC 220V/50HZ is adopted for power supplement, because the battery loses the clamping effect of the battery voltage after over-discharge, the voltage applied to the two ends of the filter capacitor can be continuously increased, so that the capacitor is exploded, the maintenance value of the product is lost, and the service life of the product is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a resistance-capacitance step-down charging circuit can effectively solve the problem that easily causes the filter capacitor explosion because of rechargeable battery overcharges after overdischarging, and the structure is practical reliable.
According to the utility model discloses resistance-capacitance step-down charging circuit, include:
a rechargeable battery;
the input end of the charging circuit is connected with a power supply, and the output end of the charging circuit is connected with the rechargeable battery;
the filter circuit comprises a filter capacitor, and the filter capacitor is connected with the rechargeable battery in parallel;
the charging circuit comprises a bridge rectifier, a first capacitor, a first resistor and a second resistor, the first resistor and the second resistor are connected in series and connected between the input end and the bridge rectifier, and the first capacitor is connected with the first resistor and the second resistor in parallel, so that current can be generated to charge the rechargeable battery after the alternating voltage of the power supply is reduced.
According to some embodiments of the invention, the power supply comprises a first alternating voltage and a second alternating voltage, the first alternating voltage is 220V/50HZ, and the second alternating voltage is 30V/200 HZ.
According to some embodiments of the present invention, the first capacitor is 1uF, and the filter capacitor is 220 uF.
According to some embodiments of the invention, the resistance of the first resistor and the second resistor is 240K.
According to some embodiments of the invention, the rechargeable battery is a lead-acid battery.
According to some embodiments of the utility model, still including the charge indicating circuit, the charge indicating circuit includes third resistance and pilot lamp, the third resistance with the pilot lamp is established ties, the one end of third resistance is connected first electric capacity with on the tie point of bridge rectifier, the negative pole of pilot lamp connect in rechargeable battery's negative pole.
According to the utility model discloses a some embodiments, still including load circuit, load circuit includes load lamp and control switch, control switch connect in rechargeable battery's positive pole with between the anodal of load lamp, the negative pole of load lamp with rechargeable battery's negative pole is connected.
According to some embodiments of the utility model, load circuit is still including first current-limiting resistance and second current-limiting resistance, first current-limiting resistance connect in a pin of control switch with between the positive pole of load lamp, second current-limiting resistance connect in another pin of control switch with between the positive pole of load lamp, control switch's control pin with rechargeable battery's positive pole is connected.
According to the utility model discloses resistance-capacitance step-down charging circuit has following beneficial effect at least:
the charging circuit is used for charging the rechargeable battery, the two ends of the rechargeable battery are connected with the filter capacitors in parallel, and the filter capacitors can be used for absorbing surge current well and effectively protecting a load; moreover, the charging circuit forms a resistance-capacitance voltage reduction circuit through the first capacitor, the first resistor, the second resistor and the bridge rectifier, when the rechargeable battery is subjected to power supplement after deep discharge, the alternating voltage at the input end of the charging circuit can be reduced to a lower voltage value, the first capacitor is enabled to have relatively smaller charging current by utilizing the characteristic of the first capacitor after the alternating voltage at the input end is reduced, and the rechargeable battery is sufficiently activated, namely, the rechargeable battery after over discharge is activated by adopting smaller current, the risk that the capacitor is easy to explode is reduced, the rechargeable battery does not need to be disassembled or replaced, the safety is improved, the maintenance cost is reduced, and the use value of the product is recovered.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
fig. 1 is a schematic circuit diagram of a rc step-down charging circuit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, if there are first, second, etc. described, it is only for the purpose of distinguishing technical features, and it is not understood that relative importance is indicated or implied or that the number of indicated technical features is implicitly indicated or that the precedence of the indicated technical features is implicitly indicated.
In the description of the present invention, it should be noted that unless there is an explicit limitation, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solutions.
Referring to fig. 1, the utility model discloses resistance-capacitance voltage-reducing charging circuit, including rechargeable battery 120, charging circuit 110 and filter circuit 130, power supply is connected to charging circuit 110's input, and rechargeable battery 120 is connected to charging circuit 110's output, and this charging circuit 110 is resistance-capacitance voltage-reducing circuit, utilizes charging circuit 110 to charge rechargeable battery 120, and filter circuit 130 includes filter capacitor, with filter capacitor parallel connection at rechargeable battery 120's both ends. As shown in fig. 1, BAT is the rechargeable battery 120, and C2 is the filter capacitor.
It can be understood that, when the rechargeable battery 120 is charged, since the moment of power-on is often accompanied by a large inrush current, the inrush current is easy to damage the load; particularly, after the rechargeable battery 120 is discharged too deeply, the rechargeable battery 120 has a large internal resistance and a weak current absorption capability, and the filter capacitor C2 has a good absorption effect on surge current, so that the load can be protected from being damaged.
Referring to fig. 1, the charging circuit 110 includes a bridge rectifier D1, a first capacitor C1, a first resistor R1, and a second resistor R2, wherein the first resistor R1 and the second resistor R2 are connected in series and then connected in parallel with the first capacitor C1, and a circuit in which the first resistor R1 and the second resistor R2 are connected in parallel with the first capacitor C1 is connected between the input terminal of the charging circuit 110 and the bridge rectifier D1, so as to form a resistance-capacitance voltage dropping circuit, and the charging battery 120 is charged by using the resistance-capacitance voltage dropping circuit.
It can be understood that, when the rechargeable battery 120 is deeply discharged, the internal resistance increases or is dead, and if the normal alternating current 220V/50HZ is adopted for power compensation, the voltage value of the specific alternating current is 220V, and the frequency is 50 HZ. Due to the loss of the clamping effect of the battery voltage, the voltage applied to the two ends of the filter capacitor C2 will continuously rise, which is likely to cause the filter capacitor C2 to explode. Therefore, in the embodiment, when the rechargeable battery 120 needs to be recharged after deep discharge, the ac voltage at the input terminal of the charging circuit 110 is reduced to a lower voltage value, where the lower voltage value is understood to be an ac voltage lower than 220V/50HZ, so as to reduce the charging current. Like this, after reducing the alternating voltage of input, make first electric capacity C1 have relatively little charging current, utilize this less charging current to charge rechargeable battery 120, satisfy rechargeable battery 120's the requirement of charging, thereby play the effect of activation rechargeable battery 120, adopt less electric current to activate rechargeable battery 120 after the overdischarge promptly, because charging current is lower, the voltage boost at rechargeable battery 120 both ends is lower, make the voltage at filter electric capacity C2 both ends also reduce, thereby the easy explosion's of electric capacity risk has been reduced, need not dismantle or change rechargeable battery 120, promote the security and reduce cost of maintenance, make the product resume use value.
Referring to fig. 1, the first capacitor C1 is 1uF for example, and is normally chargedIn time, the power supply adopts a first alternating voltage, the alternating current of the first alternating voltage is 220V/50HZ, and the capacitive reactance Xc of the first capacitor C1 in the charging circuit 110 is: xc 1/(2 pi fC) 1/(2 x 3.14 x 50 x 1 x 10-6) Where f is the frequency and C is the capacitance of the first capacitor C1, 3.2K. The charging current Ic through the first capacitor C1 is: since Ic is 0.9 × U/Xc is 220/3.2K is 61mA, the charging current of the first capacitor C1 is approximately 60 mA. After the rechargeable battery 120 is deeply discharged, the rechargeable battery is charged by using a second alternating voltage, the alternating current of the second alternating voltage is 30V/200HZ, namely the alternating current at the input end is adjusted to be 30V/200HZ, according to the calculation formula of the capacitive reactance Xc, the charging current of the first capacitor C1 can be obtained to be close to 30mA in the same way, so that the rechargeable battery 120 has enough current to be activated, the risk of damage of the filter capacitor C2 can be effectively reduced when the rechargeable battery 120 is charged at low voltage after transient discharge, the safety of the charging circuit 110 is improved, and the product maintenance cost is favorably reduced.
Referring to fig. 1, in the embodiment, the filter capacitor C2 has a capacitance of 220uF/16V, that is, a capacitance of 220uF and a withstand voltage of 16V, the capacitance of the first capacitor C1 is 1uF, the withstand voltage is 400V, and the resistances of the first resistor R1 and the second resistor R2 are both 240K. By utilizing the designed capacity of the filter capacitor C2, the alternating current at the input end is adjusted to be 30V/200HZ, and the low-current activation is carried out on the over-discharged rechargeable battery 120, so that the low-voltage high-frequency charging method is realized, and the method is suitable for products charged by adopting a resistance-capacitance voltage reduction circuit.
In the embodiment, the rechargeable battery 120 is a lead-acid battery, and is suitable for use in rechargeable lamps and charging fans, and after the lead-acid battery is over-discharged, the lead-acid battery is charged by using 30V/200HZ alternating current, so that the lead-acid battery can be effectively activated, and the service life of the filter capacitor C2 is not affected. It should be noted that the lead-acid battery is activated by using low-voltage ac, and after a certain period of time, the lead-acid battery is readjusted to be a normal power supply to charge, that is, the 220V/50HZ ac power is recovered for input.
Referring to fig. 1, in an embodiment, the charging circuit 110 includes a charging indication circuit 140, the charging indication circuit 140 includes a third resistor R3 and an indicator light, the third resistor R3 is connected in series with the indicator light, one end of the third resistor R3 is connected to a connection point of the first capacitor C1 and the bridge rectifier D1, and a negative electrode of the indicator light is connected to a negative electrode of the rechargeable battery 120, the indicator light is an LED1 shown in fig. 1, and when charging, the indicator light is turned on to emit light, so as to indicate that the rechargeable battery 120 is in a charging state, thereby improving convenience in use.
Referring to fig. 1, in the embodiment, the load circuit 150 is powered by the rechargeable battery 120, the load circuit 150 includes a load lamp and a control switch, the control switch is connected between the positive pole of the rechargeable battery 120 and the positive pole of the load lamp, the negative pole of the load lamp is connected with the negative pole of the rechargeable battery 120, the load lamp is an LED2, and the power is 3W. The switching of the LED2 may be controlled by a control switch. Specifically, the load circuit 150 has a first current limiting resistor and a second current limiting resistor, and the first current limiting resistor and the second current limiting resistor play a role in current limiting and can protect the load lamp. In fig. 1, SW1 is a control switch, the first current-limiting resistor includes a fourth resistor R4 and a fifth resistor R5 connected in parallel, the fourth resistor R4 and the fifth resistor R5 are connected in parallel and then connected between pin 3 of the control switch SW1 and the anode of the LED2, the second current-limiting resistor includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an eleventh resistor R11 connected in parallel, the second current-limiting resistor is connected between pin 1 of the control switch and the anode of the LED2, the control pin 2 of the control switch SW1 is connected with the anode of the rechargeable battery 120, and the control pin 2 can be switched to be connected with pin 1 or pin 3 by the control switch SW1, and specific working principles are not described again.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (8)
1. A resistance-capacitance step-down charging circuit, comprising:
a rechargeable battery;
the input end of the charging circuit is connected with a power supply, and the output end of the charging circuit is connected with the rechargeable battery;
the filter circuit comprises a filter capacitor, and the filter capacitor is connected with the rechargeable battery in parallel;
the charging circuit comprises a bridge rectifier, a first capacitor, a first resistor and a second resistor, the first resistor and the second resistor are connected in series and connected between the input end and the bridge rectifier, and the first capacitor is connected with the first resistor and the second resistor in parallel, so that current can be generated to charge the rechargeable battery after the alternating voltage of the power supply is reduced.
2. The rc-buck charging circuit according to claim 1, wherein the power supply comprises a first ac voltage and a second ac voltage, the first ac voltage is 220V/50HZ, and the second ac voltage is 30V/200 HZ.
3. The rc buck charging circuit of claim 2, wherein the first capacitor is 1uF and the filter capacitor is 220 uF.
4. The rc buck charging circuit of claim 1, wherein the first resistor and the second resistor have a resistance of 240K.
5. A RC buck-charge circuit according to any one of claims 1 to 4, wherein the rechargeable battery is a lead-acid battery.
6. The rc-buck charging circuit according to claim 1, further comprising a charging indicator circuit, wherein the charging indicator circuit includes a third resistor and an indicator light, the third resistor is connected in series with the indicator light, one end of the third resistor is connected to a connection point of the first capacitor and the bridge rectifier, and a negative electrode of the indicator light is connected to a negative electrode of the rechargeable battery.
7. The rc-buck charging circuit according to claim 1, further comprising a load circuit, wherein the load circuit includes a load lamp and a control switch, the control switch is connected between the positive pole of the rechargeable battery and the positive pole of the load lamp, and the negative pole of the load lamp is connected to the negative pole of the rechargeable battery.
8. The rc-buck charging circuit according to claim 7, wherein the load circuit further includes a first current-limiting resistor and a second current-limiting resistor, the first current-limiting resistor is connected between one pin of the control switch and the anode of the load lamp, the second current-limiting resistor is connected between the other pin of the control switch and the anode of the load lamp, and the control pin of the control switch is connected to the anode of the rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023001461.0U CN214227916U (en) | 2020-12-14 | 2020-12-14 | Resistance-capacitance step-down charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023001461.0U CN214227916U (en) | 2020-12-14 | 2020-12-14 | Resistance-capacitance step-down charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214227916U true CN214227916U (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023001461.0U Active CN214227916U (en) | 2020-12-14 | 2020-12-14 | Resistance-capacitance step-down charging circuit |
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| Country | Link |
|---|---|
| CN (1) | CN214227916U (en) |
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- 2020-12-14 CN CN202023001461.0U patent/CN214227916U/en active Active
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