CN215733549U - Storage battery charger output undervoltage protection circuit, charger and storage battery - Google Patents
Storage battery charger output undervoltage protection circuit, charger and storage battery Download PDFInfo
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- CN215733549U CN215733549U CN202121467093.0U CN202121467093U CN215733549U CN 215733549 U CN215733549 U CN 215733549U CN 202121467093 U CN202121467093 U CN 202121467093U CN 215733549 U CN215733549 U CN 215733549U
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Abstract
The utility model provides an output undervoltage protection circuit of a storage battery charger, the charger and a storage battery, wherein the output undervoltage protection circuit of the storage battery charger comprises a voltage sampling circuit, a reference voltage generating circuit and an output control circuit; the input end of the reference voltage generating circuit is connected with a power supply end, and the output end of the reference voltage generating circuit is connected with the second input end of the output control circuit so as to output a reference voltage signal to the output control circuit; the output control circuit is used for controlling the storage battery charger to normally or stop charging the storage battery according to the first detection signal and the reference voltage signal, so that the purpose of protecting the storage battery when the output voltage of the charger is too low is achieved.
Description
Technical Field
The utility model relates to the technical field of undervoltage protection, in particular to an output undervoltage protection circuit of a storage battery charger, the charger and a storage battery.
Background
At present, a charger generally requires constant voltage and constant current control, the output voltage range is wide, the optimal working state of the charger changes under the condition that the output voltage of the charger is reduced, and when the output voltage is particularly low, the output is abnormal, so that the switch power supply is easily damaged under the condition that a protection measure does not exert force.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides an output undervoltage protection circuit of a storage battery charger, the charger and a storage battery.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the utility model provides a storage battery charger output undervoltage protection circuit in a first aspect, which comprises a voltage sampling circuit, a reference voltage generating circuit and an output control circuit, wherein,
the input end of the voltage sampling circuit is used for being connected with the positive output end of the storage battery charger or the positive input end of the storage battery, and the output end of the voltage sampling circuit is connected with the first input end of the output control circuit so as to collect the output voltage of the storage battery charger in real time and output a first detection signal to the output control circuit;
the input end of the reference voltage generating circuit is connected with a power supply end, and the output end of the reference voltage generating circuit is connected with the second input end of the output control circuit so as to output a reference voltage signal to the output control circuit;
and the output end of the output control circuit is used for being connected with a negative output end of a storage battery charger so as to control the storage battery charger to normally or stop charging the storage battery according to the first detection signal and the reference voltage signal.
The utility model provides a charger, which comprises a charger main circuit and the storage battery charger output undervoltage protection circuit, wherein the positive output end of the charger main circuit is connected with a voltage sampling circuit in the storage battery charger output undervoltage protection circuit, and the negative output end of the charger main circuit is connected with an output control circuit in the storage battery charger output undervoltage protection circuit.
The utility model provides a storage battery, which comprises a storage battery body and the storage battery charger output undervoltage protection circuit, wherein the positive input end of the storage battery body is connected with a voltage sampling circuit in the storage battery charger output undervoltage protection circuit, and the negative input end of the storage battery body is connected with an output control circuit in the storage battery charger output undervoltage protection circuit.
The utility model has the beneficial effects that:
1) the utility model provides an output undervoltage protection circuit of a storage battery charger, which compares the output voltage of the storage battery charger with a reference voltage, and controls the storage battery charger to normally or stop charging a storage battery according to a comparison result, thereby realizing the input undervoltage protection purpose of the storage battery charger;
2) the voltage sampling circuit adopts a reset chip, collects the output voltage signal of the storage battery charger in real time through a VCC pin and a GND pin of the reset chip, and uses the output signal of the reset chip as a first detection signal to make reference for the output control circuit to control the storage battery charger to normally or stop charging the storage battery; the output current of the charger is reduced under the condition of undervoltage output, the damage of the charger caused by undervoltage output is avoided, and the charger works above the allowable lowest output voltage, so that the charger is safer;
3) the voltage sampling circuit adopts a comparator to control the switch of the MOS tube, so as to control the storage battery charger to normally or stop charging the storage battery, and the MOS tube is disconnected when the output voltage of the storage battery charger is too low, so that a charging loop cannot be formed between the charger and the storage battery, thereby protecting the charger and the storage battery, preventing the storage battery charger from generating faults when the output voltage of the storage battery charger is too low, and avoiding unnecessary accidents;
4) the resistor R2 and the resistor R4 are adjustable resistors, and the output undervoltage protection threshold of the storage battery charger is controlled by adjusting the resistance values of the resistor R2 and the resistor R4, so that the flexibility of the output undervoltage protection circuit of the storage battery charger is improved;
5) the overall circuit structure of the output undervoltage protection circuit of the storage battery charger is simple, high in efficiency, small in number of components, and safer and more reliable.
Drawings
FIG. 1 is a schematic diagram of the output undervoltage protection circuit of the battery charger of the present invention;
fig. 2 is a circuit schematic of the battery charger output undervoltage protection circuit of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
Example 1
Fig. 1 shows a specific embodiment of an output undervoltage protection circuit of a storage battery charger:
the output undervoltage protection circuit of the storage battery charger comprises a voltage sampling circuit, a reference voltage generating circuit and an output control circuit, wherein,
the input end of the voltage sampling circuit is used for being connected with the positive output end of the storage battery charger or the positive input end of the storage battery, and the output end of the voltage sampling circuit is connected with the first input end of the output control circuit so as to collect the output voltage of the storage battery charger in real time and output a first detection signal to the output control circuit;
the input end of the reference voltage generating circuit is connected with a power supply end, and the output end of the reference voltage generating circuit is connected with the second input end of the output control circuit so as to output a reference voltage signal to the output control circuit;
and the output end of the output control circuit is used for being connected with a negative output end of a storage battery charger so as to control the storage battery charger to normally or stop charging the storage battery according to the first detection signal and the reference voltage signal.
This embodiment provides a specific implementation of an output control circuit, as shown in fig. 2, the output control circuit includes a comparator U1A, a zener diode D1, a MOS transistor Q1, a resistor R1, and a resistor R5, a positive input terminal of the comparator U1A is connected to an output terminal of the voltage sampling circuit, a negative input terminal of the comparator U1A is connected to an output terminal of the reference voltage generating circuit through the resistor R5, an output terminal of the comparator U1A is connected to a gate of the MOS transistor Q1, a source of the MOS transistor Q1 is used for connecting a negative output terminal of a battery charger, and a drain of the MOS transistor Q1 is used for connecting a negative input terminal of a battery;
the anode of the zener diode D1 is connected to the source of the MOS transistor Q1, the cathode of the zener diode D1 is connected to the gate of the MOS transistor Q1, the output terminal of the comparator U1A and one end of the resistor R1, respectively, and the other end of the resistor R1 is connected to a power supply terminal.
The present embodiment further provides a specific implementation of a voltage sampling circuit, as shown in fig. 2, the voltage sampling circuit includes a reset chip U2, a resistor R2, a resistor R4, a capacitor C1, and a zener diode D2, a VCC pin of the reset chip U2 is connected to a positive output terminal of a battery charger or a positive input terminal of a battery through the resistor R2, and an output pin of the reset chip U2 is connected to a first input terminal of the output control circuit; the resistor R4, the capacitor C1 and the zener diode D2 are connected in parallel between the VCC pin and the GND pin of the reset chip U2.
It can be understood that the charger output voltage is filtered by the resistor R2, the resistor R4 and the capacitor C1 to supply power to the reset chip U2, and the zener diode D2 can prevent the reset chip U2 from being broken down when the supply voltage is high.
Furthermore, the resistor R2 and the resistor R4 are adjustable resistors, and it can be understood that the output under-voltage protection voltage can be adjusted by adjusting the resistance values of the resistors R2 and R4 according to the voltage value to be protected, and the output under-voltage protection threshold value of the battery charger is controlled by adjusting the resistance values of the resistor R2 and the resistor R4, so that the output under-voltage protection circuit of the battery charger is particularly suitable for chargers with wide output voltage ranges.
As shown in fig. 2, the reference voltage generating circuit further includes a voltage reference integrated chip U3, a capacitor C2, and a resistor R3, where a pin a of the voltage reference integrated chip U3 is connected to a ground terminal, a pin K of the voltage reference integrated chip U3 is connected to a power terminal through the resistor R3, and pin R of the voltage reference integrated chip U3 is respectively connected to a pin K of the voltage reference integrated chip U3 and a second input terminal of the output control circuit; the capacitor C2 is connected in parallel between the A pin and the K pin of the voltage reference integrated chip U3.
It can be understood that the voltage reference integrated chip U3 provides a reference voltage after being filtered by the capacitor C2, and the reference voltage is limited by the resistor R5 and transmitted to the 6 th pin of the comparator U1A.
In practical applications, there are several cases:
(1) when the loss of the storage battery is serious or damaged, the voltage of the storage battery is low, so that the input voltage (the power supply voltage of U2) of a VCC pin of a reset chip U2 in the voltage sampling circuit is smaller than a voltage threshold (the voltage threshold is determined by the inside of the reset chip U2), at this time, an output pin (2 pin) of the reset chip U2 outputs a low level (0V) and outputs the low level as a first detection signal to a pin 7 (a first input end of the output control circuit) of a comparator U1A in the output control circuit; therefore, the input voltage of pin 7 of the comparator U1A is lower than the input voltage of pin 6 (the first detection signal is smaller than the reference voltage signal), pin 1 of the comparator U1A outputs a low level (0V) to the gate of the MOS transistor Q1, the MOS transistor Q1 is turned off, so that a charging loop cannot be formed between the charger and the battery, and the charger cannot charge the battery;
at the moment, the output voltage of the charger is normal;
(2) after a period of time (internal delay of U2) is maintained, an output pin (pin 2) of a reset chip U2 in the voltage sampling circuit outputs a high level (U2 supply voltage) to a pin 7 of the comparator U1A, the pin 7 voltage of the comparator U1A is higher than a pin 6 voltage (the first detection signal is greater than the reference voltage signal), a pin 1 of the comparator U1A outputs a high level to a grid electrode of the MOS transistor Q1, the voltage is stabilized through a voltage stabilizing diode D1, the MOS transistor Q1 is turned on, and a charger charges a storage battery;
(3) the output voltage of the charger becomes low, and the MOS tube Q1 is closed under the condition that the output of the charger is under-voltage, so that the output current is reduced, the damage of the charger caused by the output under-voltage is avoided, and the charger works above the allowable lowest output voltage; repeating the steps, and limiting the output of the charger;
(4) when the storage battery is normal, the input voltage (U2 power supply voltage) of a VCC pin of a reset chip U2 in the voltage sampling circuit is greater than a voltage threshold, the output pin (2 pin) of the reset chip U2 outputs a high level to a pin 7 of a comparator U1A, the pin 7 voltage of the comparator U1A is higher than a pin 6 voltage (the first detection signal is greater than the reference voltage signal), the pin 1 of the comparator U1A outputs a high level to a grid electrode of an MOS transistor Q1, the high level is stabilized through a voltage stabilizing diode D1, the MOS transistor Q1 is opened, and the charger works normally and charges the storage battery.
Specifically, the reset chip U2 may be a three-pin reset chip, such as imp 8114; the voltage reference integrated chip U3 may employ an integrated circuit TL431, and the comparator U1A may employ an LM 2901D.
Example 2
On the basis of embodiment 1, this embodiment provides a specific implementation manner of the charger:
the charger comprises a charger main circuit and a storage battery charger output undervoltage protection circuit in embodiment 1, wherein the positive output end of the charger main circuit is connected with a voltage sampling circuit in the storage battery charger output undervoltage protection circuit, and the negative output end of the charger main circuit is connected with an output control circuit in the storage battery charger output undervoltage protection circuit.
As shown in fig. 2, the positive output end of the charger main circuit is connected to the input end of the voltage sampling circuit in the output undervoltage protection circuit of the storage battery charger, and the negative output end of the charger main circuit is connected to the source of the MOS transistor Q1 of the output control circuit in the output undervoltage protection circuit of the storage battery charger.
It can be understood that, in this embodiment, the output undervoltage protection circuit of the storage battery charger is arranged in the charger, so that the MOS transistor is turned on and off when the output voltage of the storage battery charger is too low, and the charger side prevents the storage battery charger from failing when the output voltage is too low.
Example 3
On the basis of embodiment 1, this embodiment provides a specific implementation manner of a storage battery:
the storage battery comprises a storage battery body and further comprises a storage battery charger output undervoltage protection circuit in embodiment 1, wherein the positive input end of the storage battery body is connected with a voltage sampling circuit in the storage battery charger output undervoltage protection circuit, and the negative input end of the storage battery body is connected with an output control circuit in the storage battery charger output undervoltage protection circuit.
As shown in fig. 2, the positive input end B + of the storage battery body is connected to the input end of the voltage sampling circuit in the output undervoltage protection circuit of the storage battery charger, and the negative input end B-of the storage battery body is connected to the drain of the MOS transistor Q1 of the output control circuit in the output undervoltage protection circuit of the storage battery charger.
It can be understood that, in this embodiment, the output undervoltage protection circuit of the storage battery charger is arranged in the storage battery, so that the MOS transistor is turned on and off when the output voltage of the storage battery charger is too low, and the storage battery charger is prevented from being out of order when the output voltage of the storage battery charger is too low from the side of the storage battery.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the utility model or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the utility model as defined by the appended claims.
Claims (7)
1. The utility model provides a battery charger output undervoltage protection circuit which characterized in that: comprises a voltage sampling circuit, a reference voltage generating circuit and an output control circuit, wherein,
the input end of the voltage sampling circuit is used for being connected with the positive output end of the storage battery charger or the positive input end of the storage battery, and the output end of the voltage sampling circuit is connected with the first input end of the output control circuit so as to collect the output voltage of the storage battery charger in real time and output a first detection signal to the output control circuit;
the input end of the reference voltage generating circuit is connected with a power supply end, and the output end of the reference voltage generating circuit is connected with the second input end of the output control circuit so as to output a reference voltage signal to the output control circuit;
and the output end of the output control circuit is used for being connected with a negative output end of a storage battery charger so as to control the storage battery charger to normally or stop charging the storage battery according to the first detection signal and the reference voltage signal.
2. The battery charger output under-voltage protection circuit of claim 1, wherein: the output control circuit comprises a comparator U1A, a voltage stabilizing diode D1, a MOS tube Q1, a resistor R1 and a resistor R5, wherein the positive input end of the comparator U1A is connected with the output end of the voltage sampling circuit, the negative input end of the comparator U1A is connected with the output end of the reference voltage generating circuit through the resistor R5, the output end of the comparator U1A is connected with the grid electrode of the MOS tube Q1, the source electrode of the MOS tube Q1 is used for connecting the negative output end of a storage battery charger, and the drain electrode of the MOS tube Q1 is used for connecting the negative input end of the storage battery;
the anode of the zener diode D1 is connected to the source of the MOS transistor Q1, the cathode of the zener diode D1 is connected to the gate of the MOS transistor Q1, the output terminal of the comparator U1A and one end of the resistor R1, respectively, and the other end of the resistor R1 is connected to a power supply terminal.
3. The battery charger output under-voltage protection circuit of claim 1, wherein: the voltage sampling circuit comprises a reset chip U2, a resistor R2, a resistor R4, a capacitor C1 and a voltage stabilizing diode D2, a VCC pin of the reset chip U2 is connected with a positive output end of a storage battery charger or a positive input end of a storage battery through the resistor R2, and an output pin of the reset chip U2 is connected with a first input end of the output control circuit; the resistor R4, the capacitor C1 and the zener diode D2 are connected in parallel between the VCC pin and the GND pin of the reset chip U2.
4. The battery charger output under-voltage protection circuit of claim 3, wherein: the resistor R2 and the resistor R4 are adjustable resistors.
5. The battery charger output under-voltage protection circuit of claim 1, wherein: the reference voltage generating circuit comprises a voltage reference integrated chip U3, a capacitor C2 and a resistor R3, wherein a pin A of the voltage reference integrated chip U3 is connected with a grounding end, a pin K of the voltage reference integrated chip U3 is connected with a power supply end through a resistor R3, and a pin R of the voltage reference integrated chip U3 is respectively connected with a pin K of the voltage reference integrated chip U3 and a second input end of the output control circuit; the capacitor C2 is connected in parallel between the A pin and the K pin of the voltage reference integrated chip U3.
6. A charger, comprising a main charger circuit, characterized by further comprising the battery charger output undervoltage protection circuit of any one of claims 1 to 5, wherein a positive output terminal of the main charger circuit is connected to a voltage sampling circuit in the battery charger output undervoltage protection circuit, and a negative output terminal of the main charger circuit is connected to an output control circuit in the battery charger output undervoltage protection circuit.
7. A storage battery, comprising a storage battery body, and further comprising the storage battery charger output under-voltage protection circuit of any one of claims 1 to 5, wherein the positive input end of the storage battery body is connected to the voltage sampling circuit in the storage battery charger output under-voltage protection circuit, and the negative input end of the storage battery body is connected to the output control circuit in the storage battery charger output under-voltage protection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121467093.0U CN215733549U (en) | 2021-06-30 | 2021-06-30 | Storage battery charger output undervoltage protection circuit, charger and storage battery |
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| CN202121467093.0U CN215733549U (en) | 2021-06-30 | 2021-06-30 | Storage battery charger output undervoltage protection circuit, charger and storage battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115411827A (en) * | 2022-11-01 | 2022-11-29 | 中国工程物理研究院应用电子学研究所 | Automatic start-stop analog circuit of charging and discharging device |
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2021
- 2021-06-30 CN CN202121467093.0U patent/CN215733549U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115411827A (en) * | 2022-11-01 | 2022-11-29 | 中国工程物理研究院应用电子学研究所 | Automatic start-stop analog circuit of charging and discharging device |
| CN115411827B (en) * | 2022-11-01 | 2023-01-24 | 中国工程物理研究院应用电子学研究所 | Automatic start-stop analog circuit of charging and discharging device |
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