WO2015131657A1

WO2015131657A1 - Online undervoltage auxiliary charging control circuit and control method for storage batteries

Info

Publication number: WO2015131657A1
Application number: PCT/CN2015/000108
Authority: WO
Inventors: 王晓秋
Original assignee: 王晓秋
Priority date: 2014-03-06
Filing date: 2015-02-17
Publication date: 2015-09-11
Also published as: CN103825333B; CN103825333A

Abstract

A control method of an online undervoltage auxiliary charging control circuit for storage batteries. Each storage battery (B1, B2, … Bn) is provided with the undervoltage auxiliary charging control circuit, and a series-connection circuit structure is used among contact switch circuits (SQ) of the storage batteries. In order to enable all undervoltage storage batteries to have a chance to obtain auxiliary charging, the storage batteries that are already subjected to auxiliary charging do not obtain auxiliary charging any more within regulated time. By using the control method of the online undervoltage auxiliary charging control circuit for storage batteries, a simple structure and safety and reliability are achieved.

Description

Online undervoltage auxiliary charging control circuit and control method for battery

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery undervoltage charging control circuit and a control method, and more particularly to a circuit and method for performing an auxiliary charging control on an inline undervoltage battery.

BACKGROUND OF THE INVENTION At present, a method for performing on-line charging of an under-voltage battery in a battery pack is implemented by a centralized controller in turn to perform auxiliary supplementary charging on an under-voltage battery, and finally achieves the purpose of equalizing charging of each battery. The biggest disadvantage of this method of concentrator rotation control auxiliary charging is to take two wires from each battery to the concentrator as a charging power line, even if the charging control circuit is modularized and installed on each battery, although the charging power connection is simplified. However, each module also has a communication line that is connected to the centralized controller in a bus manner. In short, this method of implementing auxiliary charging of an under-voltage battery by a centralized controller in turn control is complicated in connection and has poor system safety.

Summary of the invention

In order to overcome the disadvantages of complicated connection and poor security of centralized controller, the present invention designs a battery online undervoltage auxiliary charging control circuit, and each of the batteries is equipped with such an undervoltage auxiliary charging control circuit, and the touch is The circuit structure of the series connection is used between the point switch circuits. In order for all under-voltage batteries to have an auxiliary charge, the battery that has been assisted in charging will no longer receive auxiliary charging within the specified time.

The technical solution adopted by the invention is to implement auxiliary charging control for the under-voltage battery in the online battery pack, which is characterized in that: first, in a group of online batteries, the main charger charges the entire group of batteries, and the auxiliary charger pair The under-voltage battery is auxiliaryly charged; each battery is provided with a circuit board composed of a battery voltage measuring circuit or a voltage comparison circuit, a timing control circuit and a contact switch circuit, and the contact switch circuit is an electronic switch device for controlling the closed double a double-throw relay circuit, or a circuit consisting of two single-pole double-throw relays controlled by an electronic switching device; in the battery pack, the movable contacts of the two switches of the relay on the first battery circuit board are respectively connected to the auxiliary The positive and negative output terminals of the charger, the two normally open points corresponding to the two moving contacts on the relay are respectively connected to the positive and negative poles of the battery, and the two normally closed points corresponding to the two movable contacts are respectively connected to the next circuit board. Two moving contacts of the upper relay; two normally open points corresponding to the two moving contacts of the relay on the other battery circuit board Are connected to the respective battery positive and negative, corresponding to the two movable contacts are connected to two normally closed to the next relay board two movable contacts, i.e. the contacts between the switch circuit are connected in series. Second, when the voltage measuring circuit or the voltage comparing circuit detects that the battery voltage satisfies a window assisted charging condition lower than a certain set value but higher than another set value, the timing control circuit controls the relay in the contact switch circuit. The two switches are connected to the battery, and the contact switch circuit that is closest to the auxiliary charger and the switch has been closed with the normally open point cuts off the connection circuit between the auxiliary charger and the rear circuit board, and thus is closest to the auxiliary charger and The battery that has been connected to the normally open point of the switch first receives auxiliary charging, and the charging duration is set by the timing control circuit; after the charging is completed and the battery is disconnected from the auxiliary charger, the voltage measuring circuit will measure the battery voltage, or the voltage comparison circuit will charge the battery. The voltage is compared with the set voltage. If the battery voltage is higher than a certain set value, the timing control circuit will control the battery that has been assisted in charging to no longer obtain auxiliary charging within a prescribed time, and the connection distance from the auxiliary charger is longer. Other batteries that are far and also satisfy the window auxiliary charging conditions, the voltage on them Or the amount of circuitry After the voltage comparison circuit detects the auxiliary charger voltage, it will receive auxiliary charging.

If an isolated RS485 communication circuit is added to each circuit board, the undervoltage auxiliary charging control circuit on all the batteries can be controlled by the upper computer, such as the battery auxiliary charging sequence, the window auxiliary charging condition setting, the auxiliary charging time, Even manual or automatic charging control can be set by the program of the host computer.

The online undervoltage auxiliary charging control circuit and the control method thereof are simple, safe and reliable.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments.

Embodiment 1: The battery online undervoltage auxiliary charging control circuit is composed of a voltage measuring circuit and a contact switching circuit with a processor as a core.

Fig. 1 is a circuit schematic diagram of this embodiment.

2 is an RS485 communication interface circuit that is externally powered and has two identical channels and is isolated from the main circuit of FIG.

Since many central processing units CPUs have internal A/D analog-to-digital converters, software programming timing control and communication interfaces, the battery online undervoltage auxiliary charging control circuit uses the processor CPU as the core to implement voltage measurement and timing control. And contact switch control is the best implementation.

In Figure 1, B1, B2...Bn are a group of battery packs connected in series. Main Charger is the main charger of the battery, and BP and BN are respectively connected to the positive and negative poles of the battery pack. The Aux Charger is an auxiliary charger with transformer isolation, and P and N are their positive and negative outputs, respectively. The dotted line frame M1 is a battery voltage measuring circuit BVTC and a contact switch circuit SQ with a central processing unit CPU as the core. There are two controlled switches K1 and K2 with contacts in the SQ, and both switches are single pole double The throw switch, Control C is the control circuit of K1 and K2, that is, the contact switch circuit is a double-pole double-throw relay circuit controlled by Control C or a circuit composed of two single-pole double-throw relays controlled by Control C. . The M1 can be integrated on a single board or the M1 can be modularized for easy installation on a battery. The dashed boxes M2...Mn are all boards or modules equivalent to M1. P1 and N1 are the positive and negative poles of the battery B1, respectively, P2 and N2 are the positive and negative poles of the battery B2, respectively, and so on, and Pn and Nn are the positive and negative poles of Bn, respectively. P1 and N1 are respectively connected to the normally

open points

8 and 6 of the relay in M1. Similarly, P2 and N2 are respectively connected to the normally

open points

8 and 6 of the relay in M2, and so on. Pn and Nn are respectively connected to the normally

open points

8 and 6 of the relay in Mn. . The 1 pin V _DD in SQ is the power supply of K1 and K2 control circuit Control C. The 11 pin V _CC is the power supply of CPU and voltage measurement circuit BVTC. VDD can be shared with VCC or from battery; 2 feet and 10 feet are The ground of the power supply. Pin 9 is the input point of battery B1 voltage measuring circuit BVTC, and pin 12 is the CPU output control signal terminal. This signal is sent to pin 13 of control circuit Control C of K1 and K2 in SQ. The P and N of the Aux Charger are respectively connected to the

movable contacts

3 and 4 of SQ on the circuit board of the first battery B1, 3 and 4 are respectively in contact with the normally closed points 7 and 5 of K2 and K1, respectively, and the normally closed points of K2 and K1 are respectively The output terminals Po and No, Po and No connected to M1 are respectively connected to the

movable contacts

3 and 4 of the relay switches K2, K1 in the next broken line frame M2. Similarly, in M2, 3 and 4 are in contact with the normally closed points 7 and 5 of K2 and K1, respectively, and the normally closed points of K2 and K1 are respectively connected to the output terminals Po and No on M2, and Po and No are respectively connected to the lower The moving

contacts

3 and 4 of the relay switches K2, K1 in a dashed box M3. By analogy, in Mn-1, 3 and 4 are in contact with the normally closed points 7 and 5 of K2 and K1, respectively, and the normally closed points of K2 and K1 are respectively connected to the output terminals Po and No, Po and No on Mn-1. They are connected to the

movable contacts

3 and 4 of the relay switches K2, K1 in the next broken line frame Mn, respectively. That is, the relays on the contact switch circuit in M1, M2, M3, ... Mn are connected in series by a normally closed point.

When the voltage measuring circuit BVTC on one or several circuit boards detects that the battery voltage meets a window auxiliary charging condition lower than a certain set value but higher than another set value, the central processing unit CPU outputs a control signal to Foot 13, Control C will control the two

movable contacts

3, 4 of the two switches K1, K2 are respectively connected with two normally

open points

8, 6, respectively; the relay control circuit closest to the auxiliary charger Aux Charger wiring is firstly charged from the auxiliary The Aux Charger obtains the charging current, while the other contact switch circuit that also satisfies the undervoltage auxiliary charging condition, although the K1 and K2 on it are also closed, but the battery is closest to the auxiliary charger Aux Charger and is being supplied to the battery. K1 and K2 in the charged contact switch circuit cut off all the auxiliary charger power supply circuits, and the corresponding battery can not get the charging current. The contact switch circuit that first obtains the charging current will be regulated according to the control program in the processor CPU. The time to charge its battery, when the charging is completed and the contact switch circuit on the circuit board or module is disconnected from the auxiliary charger Aux Charger, the voltage measurement is The BVTC will measure the battery voltage. If the voltage is higher than the voltage value set by the processor's CPU program, the CPU's timing control program will not allow the auxiliary battery to be auxiliaryly charged for a specified period of time. The charger is connected to other batteries that are far away and also satisfy the window charging condition. After the voltage measuring circuit BVTC detects the auxiliary charger voltage, the auxiliary undervoltage charging will be obtained.

Figure 2 shows a common RS485 communication circuit with opto-isolation that can be added to each board or module. In Figure 2, ADM2483BRW is an isolated RS485 dedicated interface chip. RS485_TX/RX, CPU_TXD and CPU_RXD are interfaces connected to the CPU of the central processing unit. The internal power supply VCC is shared with the processor CPU control circuit power; RS485_A1, RS485_B1 and RS485_A2 RS485_B2 is the port connected to the host computer. VDD1, G1 and VDD2, G2 are external power supplies; RS485_A1, RS485_B1, VDD1, G1 and RS485_A2, RS485_B2, VDD2, G2 are called two identical externally powered devices on the device. RS485 communication interface. The purpose of providing these two identical interfaces on the device is to facilitate connection to a similar bus structure on other batteries.

If the RS485 communication interface circuit of Figure 2 is added to each circuit board or module, all undervoltage auxiliary charging control circuits in the battery pack can be controlled by the upper computer, such as battery auxiliary charging sequence, window auxiliary charging condition The setting, auxiliary charging duration, and even manual or automatic charging control can be set by the program of the host computer.

Embodiment 2: The battery online undervoltage auxiliary charging control circuit is composed of a voltage comparison circuit, a timing control circuit and a contact switch circuit.

Fig. 3 is a schematic diagram of the embodiment.

If the battery online undervoltage auxiliary charging control circuit does not use a voltage measuring circuit with a processor as the core, and uses a voltage comparison circuit, a timing control circuit and a contact switch circuit, it is also possible to realize a battery undervoltage auxiliary charging control. Program.

In Figure 3, B1, B2...Bn are a group of battery packs connected in series. Main Charger is the charger of the battery pack, and BP and BN are respectively connected to the positive and negative poles of the battery pack. The Aux Charger is an auxiliary charger with transformer isolation, and P and N are their positive and negative outputs, respectively. The dotted line frame M1 is a battery online undervoltage auxiliary charging control circuit composed of a window voltage comparator circuit WVC, a single voltage comparator circuit SVC, a timing control circuit Timer C and a contact switch circuit SQ. There are two controlled switches K1 and K2 with contacts in the SQ, and both switches are single-pole double-throw switches. Control C is the control circuit of K1 and K2, that is, this contact switch circuit is controlled by Control C. The controlled double pole double throw relay circuit is either a circuit consisting of two single pole double throw relays controlled by Control C. The M1 can be integrated on a single board or the M1 can be modularized for easy installation on a battery. The dashed boxes M2...Mn are all boards or modules equivalent to M1. P1 and N1 are the positive and negative poles of the battery B1, respectively, P2 and N2 are the positive and negative poles of the battery B2, respectively, and so on, and Pn and Nn are the positive and negative poles of Bn, respectively. P1 and N1 are respectively connected to the normally

open points

8 and 6 of the relay in Mn. . The 1 pin V _DD in the SQ is the power supply of the K1 and K2 control circuit Control C. The V _CC shared by the 2, 17, and 18 pins is the power supply of the window voltage comparator circuit WVC, the single voltage comparator circuit SVC, and the timing control circuit Timer C. V _DD can be shared with V _CC or from battery; G is the ground of power supply. The pin 9 and the pin 12 are respectively the voltage input point of the battery B1 and the set point of the reference voltage U _G in the single voltage comparator SVC circuit, and the pin 19 is the control signal output of the timing control circuit Timer C, and this signal is sent to the K1 in the SQ. And K2's control circuit 13 feet. The P and N of the Aux Charger are respectively connected to the

movable contacts

contacts

movable contacts

3 and 4 of the relay switches K2, K1 in the next broken line frame Mn, respectively. That is, the relays on the contact switch circuit in M1, M2, M3, ... Mn are connected in series through a normally closed point.

When the window voltage comparison circuit WVC on one or several circuit boards detects that the battery voltage satisfies the window auxiliary charging condition lower than the set value U _H but higher than the set value UL, the timing control circuit outputs a control signal to the foot 13, Control C will control the two

movable contacts

3, 4 of the two switches K1, K2 are connected to the two normally

open points

8, 6, respectively; the nearest relay control circuit connected from the auxiliary charger Aux Charger first from the auxiliary charger The Aux Charger obtains the charging current, while other contact switch circuits that also satisfy the undervoltage auxiliary charging condition, although the K1 and K2 on it are also closed, are closest to the auxiliary charger Aux Charger and are charging their batteries. K1, K2 in the contact switch circuit cut off all the auxiliary charger power supply circuits, the corresponding battery can not get the charging current, and the contact switch circuit that first obtains the charging current will give it the time specified by the timing control circuit. The battery is charged. When the charging is completed and the contact switch circuit on the circuit board or module is disconnected from the auxiliary charger Aux Charger, the voltage comparison circuit SVC will judge Battery voltage, if the battery voltage is higher than the set voltage value U _G , the timing control circuit Timer C will not receive auxiliary charging for the battery that has been assisted in charging for a specified period of time, and the connection distance from the auxiliary charger Other batteries that are farther and also satisfy the window charging condition, after the voltage comparison circuit SVC detects the auxiliary charger voltage, will obtain auxiliary undervoltage charging.

Claims

The invention relates to a battery online undervoltage auxiliary charging control circuit and a control method, which are a circuit and a control method for performing auxiliary charging control on an undervoltage battery in an online battery pack, characterized in that in a group of online storage batteries, the main charger is integrated The battery is charged, and the auxiliary charger performs auxiliary charging on the under-voltage battery; each battery is provided with a circuit board composed of a battery voltage measuring circuit or a voltage comparison circuit, a timing control circuit and a contact switch circuit, and the contact switch circuit is An electronic switching device controls a closed double-pole double-throw relay circuit, or a circuit composed of two single-pole double-throw relays controlled by an electronic switching device; in the battery pack, two switches of the relay on the first battery circuit board The moving contacts are respectively connected to the positive and negative output terminals of the auxiliary charger, and the two normally open points corresponding to the two moving contacts on the relay are respectively connected to the positive and negative poles of the battery, and the two normally closed corresponding to the two moving contacts The points are respectively connected to the two moving contacts of the relay on the next circuit board; the other battery circuit board continues The two normally open points corresponding to the two moving contacts of the device are respectively connected to the positive and negative poles of the respective batteries, and the two normally closed points corresponding to the two moving contacts are respectively connected to the two dynamic contacts of the relay on the next circuit board. The point, that is, the contact switch circuit is connected in series.
The battery online undervoltage auxiliary charging control circuit and the control method according to claim 1, wherein the voltage measuring circuit or the voltage comparing circuit detects that the battery voltage satisfies a certain set value but is higher than another set value. When the window assists the charging condition, the timing control circuit connects the two switches of the relay in the control contact switch circuit to the battery, and is cut off by the contact switch circuit that is closest to the auxiliary charger and has been closed with the normally open point. The connection circuit between the charger and the rear circuit board, so the battery closest to the auxiliary charger and the switch has been connected to the normally open point first obtains auxiliary charging, and the charging duration is set by the timing control circuit; the charging is completed and the battery and the auxiliary charger are completed. After disconnection, the voltage measuring circuit will measure the battery voltage, or the voltage comparison circuit compares the battery voltage with the set voltage. If the battery voltage is higher than a certain set value, the timing control circuit will control the battery that has been assisted in charging. The auxiliary charging will no longer be obtained within the time limit, and the distance from the auxiliary charger is Other batteries that are farther away and also satisfy the window auxiliary charging condition, after the voltage measuring circuit or the voltage comparing circuit thereon detects the auxiliary charger voltage, will obtain auxiliary charging.
The control method of the online undervoltage auxiliary charging control circuit for a battery according to claim 1, wherein if an isolated RS485 communication circuit is added to each circuit board, the undervoltage auxiliary charging control circuit on all the batteries can be passed through the upper computer. Control, such as battery auxiliary charging sequence, window auxiliary charging condition setting, auxiliary charging duration, and even manual or automatic charging control can be set by the host computer program.