CN219436669U - Equal charging circuit of elevator power supply storage battery - Google Patents

Equal charging circuit of elevator power supply storage battery Download PDF

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Publication number
CN219436669U
CN219436669U CN202320053982.5U CN202320053982U CN219436669U CN 219436669 U CN219436669 U CN 219436669U CN 202320053982 U CN202320053982 U CN 202320053982U CN 219436669 U CN219436669 U CN 219436669U
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charging
voltage
storage battery
circuit
current
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CN202320053982.5U
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喻斌
沈娟花
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Hangzhou Huiling Control Engineering Co ltd
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Hangzhou Huiling Control Engineering Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The utility model discloses a uniform charging circuit of an elevator power supply storage battery pack, which comprises a charging module and an equalizing module. The charging module converts 220V alternating current into direct current to charge the storage battery, and comprises a sampling circuit and a charging control circuit. The sampling circuit samples the charging current and the charging voltage of the storage battery pack and inputs the charging current and the charging voltage into the charging control circuit. The charging control circuit comprises first to third voltage comparators, and adjusts the charging mode by changing the negative feedback quantity of the voltage comparators. And the equalization module controls the voltage equalization of each storage battery in the storage battery pack through a passive voltage equalization circuit. The circuit can monitor the state of each storage battery, prevent the occurrence of undercharge, overcharge and overdischarge, and keep the electric quantity of each storage battery equal, thereby prolonging the service life. And the charging mode is switched in the charging process, so that the problems of long charging time and insufficient electric quantity caused by single charging mode are solved.

Description

Equal charging circuit of elevator power supply storage battery
Technical Field
The utility model belongs to the technical field of battery management, and particularly relates to a uniform charging circuit of an elevator power supply storage battery pack.
Background
The elevator control cabinet usually uses a lead-acid storage battery as a backup energy source for replacing the mains supply to supply power for the elevator control cabinet when the mains supply circuit fails, so that stable operation for a period of time is ensured. Since the output voltage of a single lead-acid battery often fails to meet the operating requirements, multiple batteries are required to be connected in series to form a battery pack for use.
A battery is a device that converts chemical energy into electrical energy, the release of which is accomplished by means of chemical reactions. In the manufacturing process of the storage battery, the difference of the thickness of the polar plate, the activation degree of the active substance and the like can influence the performance of the storage battery, so that even the storage batteries of the same type, specification and model have differences in voltage, internal resistance and capacity, and the performance is not uniform. The charging voltages allocated to the individual batteries are typically not equal during charging of the series-connected battery packs due to performance differences in the batteries themselves, but rather are of different magnitudes. As the number of charging increases, it is inevitable that part of the storage battery in the storage battery pack is overcharged, and part of the storage battery is undercharged; and then, partial storage batteries are over-discharged in the power supply process of the storage battery pack. With the increase of charge and discharge times, the storage battery is easy to have the problems of excessively fast capacity reduction and shortened service life, and the operation stability of the elevator control cabinet is also easy to be influenced. The traditional storage battery charging mode only has two types of constant voltage and constant current, has the defects of longer charging time and dissatisfaction for a single storage battery, and obviously also has difficulty in meeting the requirement of uniform charging of the storage battery.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a uniform charging circuit of an elevator power supply storage battery pack, and provides a three-section charging control circuit which is used for switching the charging mode of the storage battery pack according to charging current and voltage so as to accelerate the charging process. And the state of each storage battery is monitored through the equalization circuit, so that the occurrence of undercharge, overcharge and overdischarge is prevented, the electric quantity of each storage battery is kept equal, the service life of the storage battery pack is prolonged, and the performance stability is ensured.
A charge balancing circuit of an elevator power supply storage battery pack comprises a charging module and an equalizing module.
The charging module converts 220V alternating current into direct current to charge the storage battery, and comprises a sampling circuit and a charging control circuit. The sampling circuit samples the charging current and the charging voltage of the storage battery pack and inputs the charging current and the charging voltage into the charging control circuit. The charging control circuit comprises first to third voltage comparators, and adjusts the charging mode by changing the negative feedback quantity of the voltage comparators. The second voltage comparator compares the sampled charging current with a set current limiting value, the third voltage comparator compares the sampled charging voltage with a set voltage reference value, and the charging mode of the storage battery pack is adjusted according to the comparison result. The first voltage comparator compares the sampled charging current with a set conversion current value, and reduces a voltage reference value input into the third voltage comparator according to a comparison result. The specific adjusting mode is as follows:
the specific adjusting mode is as follows:
(1) when the sampling current is larger than the conversion current value and not larger than the current limiting value and the charging voltage is smaller than the voltage reference value, the negative feedback proportion of the second comparator is changed, and the charging mode is adjusted to be constant-current charging.
(2) When the sampling voltage is not smaller than the voltage reference value, the negative feedback proportion of the third comparator is changed, and the charging mode is adjusted to constant voltage charging.
(3) When the sampling current is smaller than the conversion current value, the negative feedback proportion of the first comparator is changed, the voltage reference value is reduced, and the charging mode is adjusted to be floating charging.
Preferably, the switching current value is set to 0.15A, the current limit value is set to 1.1A, the voltage reference value is set to 58V-59.6V, and the reduced voltage reference value is set to 54V-55.2V.
Preferably, the charging module further comprises an EMC and lightning protection surge circuit, a rectifying and filtering circuit, a switching circuit and a voltage reduction circuit, the charging module is connected into the mains supply circuit through the EMC and lightning protection surge circuit, then converts alternating current into direct current through the rectifying and filtering circuit, and the voltage reduction circuit outputs 36-54V direct current voltage according to the adjustment of the charging control circuit so as to charge the storage battery.
And the equalization module controls the voltage equalization of each storage battery in the storage battery pack through a passive voltage equalization circuit.
Preferably, in the balancing module, two ends of each storage battery are connected in parallel with a passive voltage balancing circuit. The passive voltage balancing circuit comprises a voltage reference chip, a triode and a discharge resistor. And the full-charge voltage of the storage battery is output through the voltage reference chip, and when the voltage at the two ends of the anode and the cathode of the storage battery reaches the full-charge voltage, the voltage reference chip absorbs the charging current to enable the triode to be conducted, the storage battery discharges through the discharging resistor, and the single storage battery is prevented from being overcharged.
The utility model has the following beneficial effects:
in the charging process, the circuit samples the charging current and the charging voltage, switches the charging mode of the storage battery, makes up the defect of low charging speed of a single charging mode, and timely performs voltage equalization according to the charge state of the single storage battery through the equalization module, so that the electric quantity of each storage battery in the storage battery is kept equal as much as possible, the single storage battery is prevented from being undercharged, overcharged and overdischarged, and the service life of the storage battery is prolonged.
Drawings
FIG. 1 is a schematic diagram of a charge equalization circuit in an embodiment;
FIG. 2 is a schematic diagram of a charge control circuit according to an embodiment;
fig. 3 is a schematic diagram of an equalization module in an embodiment.
Detailed Description
In the embodiment, storage batteries with the model number of 6-FM-7 produced by four sail Limited liability companies are connected in series to form a storage battery pack, and the storage battery pack is subjected to balanced charging. As shown in fig. 1, a charge balancing circuit of an elevator power supply storage battery pack comprises a charging module and an equalizing module.
The charging module comprises an EMC (electro magnetic compatibility) anti-lightning surge circuit, a rectifying and filtering circuit, a switching circuit, a voltage reduction circuit, a sampling circuit and a charging control circuit. The charging module is connected into a commercial power circuit through an EMC and lightning protection surge circuit, then 220V alternating current is converted into direct current through a rectifying and filtering circuit, and the voltage reducing circuit outputs 36-54V direct current voltage according to the adjustment of the charging control circuit to charge the storage battery. The sampling circuit samples the charging current and the charging voltage of the storage battery pack and inputs the charging current and the charging voltage into the charging control circuit.
As shown in fig. 2, the charge control circuit includes first to third voltage comparators for setting the switching current value I 1 Is 0.15A, current limiting value I 2 Is 1.1A, voltage reference value V ref 58V-59.6V, and reduced voltage reference value V ref -54V to 55.2V. The voltage comparator in the charging control circuit compares the set threshold value with the charging current and the charging voltage output by the sampling circuit, changes the magnitude of negative feedback quantity of the voltage, controls the output voltage of the voltage reduction circuit, and adjusts different charging modes by changing the negative feedback quantity of the voltage comparators. Specifically, the second voltage comparator samples the obtained charging current I and the set current limiting value I 2 Comparing the sampled charging voltage V with a set voltage reference value V by a third voltage comparator ref And comparing, and adjusting the charging mode of the storage battery pack according to the comparison result. The first voltage comparator samples the obtained charging current I and the set conversion current value I 1 And comparing, namely reducing the voltage reference value input into the third voltage comparator according to the comparison result. After the charging module is connected with the mains supply, the power supply output gradually rises after a soft start process, and when the charging current reaches a current limiting value I 2 Then, the charging control circuit starts to work, and the specific adjustment mode is as follows:
(1) when I 1 ＜I≤I 2 V < V ref And adjusting the charging mode to constant current charging.
(2) When V is greater than or equal to V ref In this case, the charging mode is adjusted to constant voltage charging.
(3) When I < I 1 At the time, the voltage reference value V is reduced ref - =54V to 55.2V, and the charging mode is adjusted to be floating charging.
The charging control circuit can adjust the charging mode of the storage battery pack to be constant-current charging, constant-voltage charging or floating charging according to the sampling result of the sampling circuit, so that the problems of long charging time and insufficient electric quantity caused by single charging mode are avoided.
And the equalization module is connected with a passive voltage equalization circuit in parallel at two ends of each storage battery in the storage battery pack to perform voltage equalization control. As shown in fig. 3, the passive voltage balancing circuit includes a voltage reference chip, a switching tube and a discharge resistor. And when the voltage at the two ends of the positive electrode and the negative electrode of the storage battery reaches full-charge voltage, the voltage reference chip starts to absorb current, and the charging current of the storage battery flows through the triode to enable the triode to be conducted and discharge through the discharging resistor, so that the single storage battery is prevented from being overcharged. The diode and resistor connected between the collector of the triode and the negative electrode of the storage battery are used for dividing voltage, reducing the power consumed on the triode, and the light emitting diode can be replaced to indicate the charging state of the storage battery, and when the light emitting diode is lighted, the storage battery is fully charged.

Claims (6)

1. The utility model provides a homogeneous charge circuit of elevator power supply storage battery which characterized in that: the device comprises a charging module and an equalization module;
the charging module converts 220V alternating current into direct current to charge the storage battery pack, and comprises a sampling circuit and a charging control circuit; the sampling circuit samples the charging current and the charging voltage of the storage battery pack and inputs the charging current and the charging voltage into the charging control circuit; the charging control circuit comprises first to third voltage comparators, the first voltage comparator compares the sampled charging current with a set conversion current value, the second voltage comparator compares the sampled charging current with a set current limiting value, the third voltage comparator compares the sampled charging voltage with a set voltage reference value, the negative feedback quantity of the voltage comparator is changed according to the comparison result, and the charging mode of the storage battery pack is regulated to be constant-current charging, constant-voltage charging or floating charging;
the specific adjusting mode is as follows:
(1) when the sampling current is larger than the conversion current value and not larger than the current limiting value and the charging voltage is smaller than the voltage reference value, changing the negative feedback proportion of the second comparator, and adjusting the charging mode to constant current charging;
(2) when the sampling voltage is not smaller than the voltage reference value, changing the negative feedback proportion of the third comparator, and adjusting the charging mode to constant voltage charging;
(3) when the sampling current is smaller than the conversion current value, changing the negative feedback proportion of the first comparator, reducing the voltage reference value, and adjusting the charging mode to be floating charging;
and the equalization module is connected with a passive voltage equalization circuit in series at two ends of each storage battery to control the voltage equalization of each storage battery in the storage battery pack.
2. A homogeneous charge circuit for an elevator power storage battery as defined in claim 1, wherein: the switching current value is set to be 0.15A, the current limiting value is set to be 1.1A, the voltage reference value is set to be 58V-59.6V, and the voltage reference value after reduction is set to be 54V-55.2V.
3. A homogeneous charge circuit for an elevator power storage battery as defined in claim 1, wherein: the charging module further comprises an EMC and lightning protection surge circuit, a rectifying and filtering circuit, a switching circuit and a voltage reducing circuit, wherein the charging module is connected into the mains supply circuit through the EMC and lightning protection surge circuit and then converts alternating current into direct current through the rectifying and filtering circuit, and the voltage reducing circuit outputs 36-54V direct current voltage according to the regulation of the charging control circuit so as to charge the storage battery pack.
4. A homogeneous charge circuit for an elevator power storage battery as defined in claim 1, wherein: the passive voltage balancing circuit comprises a voltage reference chip, a triode and a discharge resistor; and outputting full-charge voltage of the storage battery through the voltage reference chip, and when the voltage of the two ends of the anode and the cathode of the storage battery reaches the full-charge voltage, absorbing the charging current by the voltage reference chip to enable the switch tube to be conducted, and discharging the storage battery through the discharging resistor.
5. The elevator power supply storage battery pack homogeneous charge circuit according to claim 4, wherein: the diode and the resistor arranged between the collector of the triode and the cathode of the storage battery are used for dividing voltage, so that the power consumed on the triode is reduced.
6. The elevator power supply storage battery pack homogeneous charge circuit according to claim 4, wherein: the LED and the resistor are arranged between the triode collector and the storage battery cathode, and the LED is used for indicating the charging state of the storage battery when the storage battery is full.
CN202320053982.5U 2023-01-09 2023-01-09 Equal charging circuit of elevator power supply storage battery Active CN219436669U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320053982.5U CN219436669U (en) 2023-01-09 2023-01-09 Equal charging circuit of elevator power supply storage battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320053982.5U CN219436669U (en) 2023-01-09 2023-01-09 Equal charging circuit of elevator power supply storage battery

Publications (1)

Publication Number Publication Date
CN219436669U true CN219436669U (en) 2023-07-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320053982.5U Active CN219436669U (en) 2023-01-09 2023-01-09 Equal charging circuit of elevator power supply storage battery

Country Status (1)

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CN (1) CN219436669U (en)

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