CN207504606U - A kind of controller for power UPS series-connected batteries charge and discharge protectings - Google Patents

Abstract

The utility model discloses a kind of controllers for power UPS series-connected batteries charge and discharge protectings; including voltage control unit, fault detect alarm unit and voltage detecting alarm unit; the voltage control unit includes zener diode ZD1 and transistor amplifier circuit; the transistor amplifier circuit is three-level transistor amplifier circuit; including triode VT1, VT2, VT3, resistance R1, R2, R3, R4, R5, R6 and capacitance C1.The utility model realizes power UPS series-connected batteries voltage stabilizing charging and prevents the purpose of single overcharge of a battery, reduces injury of the charging process to battery, improves the service life of battery.

Description

A controller for charge and discharge protection of power UPS series battery packs

technical field

The utility model relates to the field of charge and discharge protection of series storage battery groups, in particular to a controller for charge and discharge protection of power UPS series storage battery groups.

Background technique

Battery packs are widely used in power supply equipment that needs to store electric energy in the fields of electric vehicles, electricity, communication and automation, and can play the role of mobile or fixed installation power supply. When the electric energy stored in the battery pack is discharged, it needs to be charged for reuse. The battery pack is generally 2-40 or 96 single batteries used in series or parallel (charging or discharging). Even if batteries of the same specification are charged in series, the electrical properties (capacity, internal resistance, working voltage, etc.) bigger. At this time, if the battery pack is charged, it will appear that some batteries are far from being fully charged, while some batteries have been overcharged. Overcharging of the batteries is very harmful to the batteries, and may even cause the batteries to burn or explode. So it is very necessary to prevent the battery from overcharging. The power UPS series battery pack is in the floating charging state for a long time and the instantaneous high current discharge working state (3-5 times the current rate), which is a new application technology. The working requirements of the battery pack in this system are also very different from other applications. same. At present, there is no technology and equipment for charging and discharging the whole process of charging and discharging series battery packs with load characteristics such as power UPS and preventing single battery from overcharging. However, power UPS batteries are more and more used in various production devices. Used to solve the anti-grid flashover.

Utility model content

In order to overcome the shortcomings of the existing technology, the utility model provides a controller for charging and discharging protection of power UPS series battery packs. The charging voltage of each battery in the battery pack is basically the same at the end of charging.

The technical solution of the utility model:

A controller for charging and discharging protection of power UPS series battery packs, characterized in that it includes a voltage control unit with the same number as the number of series batteries, and the voltage control unit includes a Zener diode ZD1 and a transistor amplifier circuit, and the transistor The amplifying circuit is a three-stage transistor amplifying circuit, including triodes VT1, VT2, VT3, resistors R1, R2, R3, R4, R5, R6 and capacitor C1, one end of the Zener diode ZD1 is connected to the positive pole of the battery, and the other end is connected to the resistor R1 One end of the resistor R2 is connected to the resistor R1, the other end is connected to the base of the transistor VT1, one end of the resistor R3 is connected to the base of the transistor VT1, the other end is connected to the positive pole of the storage battery, one end of the resistor R4 is connected to the emitter of the transistor VT1, and the other end is connected to the base of the transistor VT1. One end is connected to the base of the transistor VT2, one end of the resistor R5 is connected to the emitter of the transistor VT2, the other end is connected to the base of the transistor VT3, one end of the resistor R6 is connected to the collector of the transistor VT3 and the positive pole of the storage battery, and the other end is connected to the capacitor C1 connect.

Preferably, the model of the Zener diode ZD1 is 1N5348B, and the models of the triodes VT1, VT2 and VT3 are 2SC3953, 2SC3182N and 2SC3213 respectively.

Preferably, the voltage control unit further includes an anti-reverse diode VD1, one end of the anti-reverse diode VD1 is connected to the Zener diode ZD1, and the other end is connected to the resistor R1.

Preferably, the controller for charging and discharging protection of power UPS series storage battery packs also includes a fault detection and alarm unit having the same number as the series storage batteries, and the fault detection and alarm unit includes a fuse FU1, a resistor R7, a resistor R8, The green light-emitting diode LED1 and the red light-emitting diode LED2, the resistor R7 is connected in series with the green light-emitting diode LED1, the resistor R8 is connected in series with the red light-emitting diode LED2, and the fuse FU1 is connected in parallel at both ends of the resistor R8 and the red light-emitting diode LED2.

Preferably, the fault detection and alarm unit also includes a reverse-reverse diode VD2 and a reverse-reverse diode VD3, the reverse-reverse diode VD2 is connected in series with the resistor R7 and the green light-emitting diode LED1, the reverse-reverse diode VD3 is connected in series with the resistor R8 and the red light-emitting diode LED2, and the fuse FU1 is connected in parallel at both ends of the circuit composed of resistor R8, red light-emitting diode LED2 and anti-reverse diode VD3.

Preferably, the fusing current of the fuse FU1 is 30A, and the models of the green light-emitting diode LED1 and the red light-emitting diode LED2 are both TZ-5R4VC.

Preferably, the models of the anti-reverse diodes VD1, VD2 and VD3 are all 1N4002.

Preferably, the controller for charging and discharging protection of power UPS series battery packs also includes a voltage detection and alarm unit, the voltage detection and alarm unit includes a battery voltage detector, a PLC controller, a touch screen and an alarm device, a battery voltage detector, The touch screen and alarm device are connected to the PLC controller through wires, and the battery voltage detector is connected to each fault detection and alarm unit through direct plug-in terminals.

Preferably, the alarm device is a flashing alarm.

The beneficial effects of the utility model:

The utility model can prevent overcharging and protect each battery in the power UPS series battery pack in the whole process of charging and discharging, and make the voltage of each battery in the series battery pack basically consistent at the end of charging; the utility model discloses Technical solution When charging, the voltage control unit is used as a bypass to control the voltage of the battery connected in parallel with it, instead of realizing voltage equalization control and preventing overcharging of a single battery by consuming electric energy, that is, the fully charged battery will not be charged during the charging process. Charging the storage battery will only continue to charge the battery that is not fully charged, thereby reducing the damage to the storage battery; the fault detection and alarm unit and the voltage detection and alarm unit can give alarm information in time when the circuit fails.

Description of drawings

Fig. 1 is the block diagram of circuit principle of the utility model.

Figure 2 is a circuit schematic diagram of any voltage control unit and fault detection and alarm unit.

Among them: 1 storage battery 2 charger 3 PLC controller 4 voltage control unit 5 fault detection alarm unit 6 battery voltage detector 7 touch screen 8 alarm device.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

The storage battery described in this embodiment is a nominal 12V storage battery 1 , and it is generally required that the nominal 12V storage battery 1 has a voltage of 13.6V when fully charged. The number of batteries 1 connected in series is 40, that is, n=1, 2, 3..., 40 in Figure 2, the charging current of charger 2 is 10A, and the batteries 1 connected in series connect with the charger through wires during operation. 2, the charger 2 is connected to the PLC controller 3 through wires, and the number of chargers 2 is m.

A controller for charging and discharging protection of power UPS series battery packs, comprising a voltage control unit 4, a fault detection and alarm unit 5, and a voltage detection and alarm unit. The number of the voltage control unit 4 is the same as the number of the batteries 1 connected in series, and the voltage control unit 4 includes a Zener diode ZD1, a transistor amplifier circuit and a non-reverse diode VD1. Zener diode ZD1 is used to control the reference voltage, its model is 1N5348B, and the stable voltage is 11V. The transistor amplifier circuit is a three-stage transistor amplifier circuit, including triodes VT1, VT2, VT3, resistors R1, R2, R3, R4, R5, R6 and capacitor C1. As shown in Figure 2, one end of the Zener diode ZD1 is connected to the positive pole of the battery, the other end is connected to the anti-reverse diode VD1, one end of the resistor R2 is connected to R1, the other end is connected to the base of the transistor VT1, one end of the resistor R3 is connected to the base of the transistor VT1 One end of resistor R4 is connected to the emitter of transistor VT1, the other end is connected to the base of transistor VT2, one end of resistor R5 is connected to the emitter of transistor VT2, and the other end is connected to the emitter of transistor VT3 The base is connected, one end of the resistor R6 is connected to the collector of the triode VT3 and the positive electrode of the storage battery, and the other end is connected to the capacitor C1. The models of the transistors VT1, VT2 and VT3 are 2SC3953, 2SC3182N and 2SC3213 respectively. The resistance values of the resistors R1, R2, R3, R4, R5, and R6 are 400Ω, 10Ω, 5KΩ, 1Ω, 0.05Ω, and 100Ω, respectively, and the capacitor C1 is 0.47uf. The three-stage transistor amplifier circuit can perform three-stage current amplification to meet the requirement of the maximum charging current of the storage battery 1 . The anti-reverse diode VD1 is used to prevent the voltage regulator diode ZD1 from breaking down when the current flows from bn to an through the voltage control unit 4 when the battery 1 is discharged. The number of the fault detection alarm unit 5 is the same as the number of the battery 1 connected in series, and the fault detection alarm unit 5 includes a fuse FU1, a resistor R7, a resistor R8, a non-reverse diode VD2, a non-reverse diode VD3, a green light-emitting diode LED1 and a red Light-emitting diode LED2, anti-reverse diode VD2, resistor R7, green light-emitting diode LED1 are connected in series, anti-reverse diode VD3, resistor R8, red light-emitting diode LED2 are connected in series, fuse FU1 is composed of resistor R8, red light-emitting diode LED2, and anti-reverse diode VD3 both ends of the line. The fusing current of the fuse FU1 is 30A. The models of the anti-reverse diodes VD1, VD2 and VD3 are all 1N4002, and the anti-reverse diodes VD2 and VD3 can prevent the green light-emitting diode LED1 and the red light-emitting diode LED2 from being broken down by reverse high voltage when the circuit fails. The resistance values of the resistor R7 and the resistor R8 are both 400Ω. The models of the green light emitting diode LED1 and the red light emitting diode LED2 are both TZ-5R4VC. As shown in Figure 2, when the voltage between c and d is lower than 10V, the light of the green light-emitting diode LED1 will be dimmed (which can be visually compared with other green light-emitting diodes in the same group), when the voltage between c and d When the voltage is lower than 5V, the green light-emitting diode LED1 will not emit light. When the voltage between d and e is lower than 10V, the light of the red light-emitting diode LED2 will be dimmed (visually compared with other red light-emitting diodes in the same group) , When the voltage between d and e is lower than 5V, the red light-emitting diode LED2 will not emit light. Described voltage detection alarm unit comprises accumulator voltage detector 6, PLC controller 3, touch screen 7 and alarm device 8, and accumulator voltage detector 6, touch screen 7 and alarm device 8 are connected with PLC controller 3 by wire, and accumulator voltage detector 6 is connected to each fault detection and alarm unit 5 by directly plugging and unplugging the terminal, and the voltage alarm value is pre-stored in the PLC controller 3 . The battery voltage detector 6 is installed on the first cabinet, and the PLC controller 3, touch screen 7 and alarm device 8 are installed on the second cabinet. The voltage detection and alarm unit is a prior art, and the voltage is not specified in this specification. Detect the structure of alarm unit, the storage battery voltage detector 6 that adopts in the present embodiment is the equipment of Shanghai Junrui Automation Technology Co., Ltd., and the equipment model is JRBATG I-30/12, and the PLC controller 3 that adopts is the S7- 200 PLC controller, but the equipment models of battery voltage detector 6 and PLC controller 3 are not limited to the above two models, all models that can realize the functions of battery voltage detector 6 and PLC controller 3 described in this manual can be . The alarm device 8 is a flashing alarm.

Working principle of the utility model:

The working principle of the voltage control unit 4: when the voltage between an and bn in Fig. 2 is lower than 11.7V, due to the voltage division of the anti-reverse diode VD1, the voltage regulation value (breakdown voltage) of the Zener diode ZD1 has not yet been reached, Zener diode ZD1 is not conducting, according to the principle of series voltage division, due to the series voltage division of resistors R1, R2, R3, the voltage at point f is less than 1V, and the sum of Vbe of triode VT1, VT2, VT3 is greater than 1.6V, so the triode VT1, VT2, and VT3 cannot be turned on. At this time, the charging current flows through an and bn, so that the storage battery 1 between an and bn is normally charged. When the voltage between an and bn exceeds 11.7V, the Zener diode ZD1 is turned on, so that the voltage at point f gradually exceeds 1.6V. At this time, the voltage between an and bn will reach above 13.3V, and the transistor VT1 has The base current is amplified by VT2 and VT3 to change the collector and emitter current of VT3 from 0.1-10A, and the voltage control unit 4 realizes the purpose of shunting, thereby reducing the charging current of the battery 1 between an and bn . When the voltage of battery 1 between an and bn reaches 13.6V, the charging current basically flows through the transistor amplifier circuit between points c and e, and it can continue to charge the battery below 13.6V, and the current basically does not It will flow through the battery 1 between an and bn, so as to protect the battery 1 from overcharging. At the same time, the fully charged battery 1 will not be charged during the charging process, and only the battery 1 that is not fully charged will continue to be charged, that is, the voltage control unit 4 is used as a bypass to control the voltage of the battery 1 connected in parallel with it during charging. , instead of realizing voltage equalization control and preventing overcharging of a single battery by consuming electric energy, thereby reducing damage to the battery and improving the service life of the battery.

The working principle of fault detection and alarm unit 5: when neither the green light-emitting diode LED1 nor the red light-emitting diode LED2 emit light, it means that the voltage control unit 4 is open circuit or the branches where LED1 and LED2 are located are all open circuits; When LED2 does not emit light, the voltage control unit 4 and the fault detection and alarm unit 5 are in normal working state; when the green light-emitting diode LED1 and the red light-emitting diode LED2 emit light at the same time, it means that the fuse FU1 is blown or the connection of the fuse FU1 is open; when the green light-emitting diode When the LED1 does not emit light and the red light-emitting diode LED2 emits light, it means that the fuse PU1 and the transistor amplifier circuit have been fused and broken down respectively. Repair and maintenance personnel can judge the working state of the circuit according to the states of the green light-emitting diode LED1 and the red light-emitting diode, and carry out maintenance.

The working principle of the voltage detection and alarm unit: the battery voltage detector 6 detects the voltage between cd and de and transmits it to the PLC controller 3, and the PLC controller 3 compares the received voltage between cd and the voltage between de Add, calculate the voltage between ce, and display the voltage value between cd, de and ce through the touch screen 7, and PLC controller 3 will receive the voltage between cd, the voltage between de And compare the calculated voltage between ce with the pre-stored alarm value. When the voltage between cd is lower than 10V (set to 10V in this embodiment, a voltage value can be arbitrarily selected between 6-11V in practical applications), the touch screen 7 displays that the voltage control unit 4 is faulty, and the green light-emitting diode LED1 changes simultaneously. Dark; when the voltage between de is higher than 2V, the touch screen 7 displays fuse FU1 failure; when the calculated voltage between ce is higher than 13.6V (set to 13.6V in this embodiment, it can be set at 13.3- Choose a voltage value between 14V arbitrarily) when the touch screen 7 displays the corresponding battery 1 overvoltage; when the calculated voltage between ce is lower than 10.8V (set to 10.8V in this embodiment, it can be set at 10.5- 11V, choose a voltage value arbitrarily) when the touch screen 7 displays the corresponding battery 1 undervoltage. In addition, the PLC controller 3 accumulates the calculated voltage between ce, when the accumulated voltage value between ce is lower than 432V (set to 432V in this embodiment, it can be between 420-460V in actual application Randomly select a voltage value) or when the charger fails, the PLC controller 3 controls the alarm device 8 to give an alarm message.

In summary, the utility model achieves the desired effect.

Claims (10)

1. A controller for charging and discharging protection of power UPS series storage battery packs, characterized in that: it includes a voltage control unit with the same number as the number of series storage batteries, and the voltage control unit includes a Zener diode ZD1 and a transistor amplifier circuit, the The transistor amplifying circuit described above is a three-stage transistor amplifying circuit, including triodes VT1, VT2, VT3, resistors R1, R2, R3, R4, R5, R6 and capacitor C1, one end of the Zener diode ZD1 is connected to the positive pole of the storage battery, and the other end is connected to the positive Connect R1, one end of resistor R2 is connected to resistor R1, the other end is connected to the base of triode VT1, one end of resistor R3 is connected to the base of triode VT1, the other end is connected to the positive pole of the battery, one end of resistor R4 is connected to the emitter of triode VT1 , the other end is connected to the base of the transistor VT2, one end of the resistor R5 is connected to the emitter of the transistor VT2, the other end is connected to the base of the transistor VT3, one end of the resistor R6 is connected to the collector of the transistor VT3 and the positive pole of the battery, and the other end is connected to the positive electrode of the battery Capacitor C1 is connected. 2. A controller for charging and discharging protection of power UPS series battery packs as claimed in claim 1, characterized in that: the model of the Zener diode ZD1 is 1N5348B, and the models of the triodes VT1, VT2 and VT3 are respectively 2SC3953, 2SC3182N, 2SC3213. 3. A controller for charging and discharging protection of power UPS series battery packs as claimed in claim 1, characterized in that: said voltage control unit also includes a non-reverse diode VD1, one end of the non-reverse diode VD1 is connected to a Zener diode ZD1 is connected, and the other end is connected with resistor R1. 4. A controller for charging and discharging protection of power UPS series storage battery packs as claimed in claim 1, characterized in that: it also includes a fault detection and alarm unit having the same number as the series storage battery, and the fault detection and alarm unit includes Fuse FU1, resistor R7, resistor R8, green light-emitting diode LED1 and red light-emitting diode LED2, resistor R7 is connected in series with green light-emitting diode LED1, resistor R8 is connected in series with red light-emitting diode LED2, fuse FU1 is connected in parallel with resistor R8, red light-emitting diode LED2 ends. 5. A controller for charging and discharging protection of power UPS series storage battery packs as claimed in claim 4, characterized in that: the fault detection and alarm unit also includes a reverse diode VD2 and a reverse diode VD3, the reverse diode VD3 VD2 is connected in series with resistor R7 and green light-emitting diode LED1, anti-reverse diode VD3 is connected in series with resistor R8 and red light-emitting diode LED2, and fuse FU1 is connected in parallel at both ends of the circuit composed of resistor R8, red light-emitting diode LED2 and anti-reverse diode VD3. 6. A controller for charging and discharging protection of power UPS series battery packs as claimed in claim 4, characterized in that: the fusing current of the fuse FU1 is 30A, and the green light-emitting diode LED1 and red light-emitting diode The models of LED2 are both TZ-5R4VC. 7. A controller for charging and discharging protection of power UPS series battery packs as claimed in claim 3, characterized in that: the type of the anti-reverse diode VD1 is 1N4002. 8. A controller for charging and discharging protection of power UPS series battery packs as claimed in claim 5, characterized in that: the anti-reverse diodes VD2 and VD3 are 1N4002 in type. 9. A controller for charging and discharging protection of power UPS series battery packs as claimed in claim 1, characterized in that: it also includes a voltage detection and alarm unit, and the voltage detection and alarm unit includes a battery voltage detector, a PLC controller, The touch screen and alarm device, the battery voltage detector, the touch screen and the alarm device are connected to the PLC controller through wires, and the battery voltage detector is connected to each fault detection and alarm unit through direct plug-in terminals. 10. A controller for charging and discharging protection of power UPS series battery packs as claimed in claim 9, wherein the alarm device is a flashing alarm.