WO2001069766A1

WO2001069766A1 - Controlled battery power supply device

Info

Publication number: WO2001069766A1
Application number: PCT/CN2001/000296
Authority: WO
Inventors: Qun Huang
Original assignee: Qun Huang
Priority date: 2000-03-14
Filing date: 2001-02-27
Publication date: 2001-09-20
Also published as: AU2001248222A1

Abstract

The invention relates to a controlled battery power supply device which is characterized in that: it comprises a control means for controlling the on/off states of each of control gates, the control gates which are serially/parallely connected between batteries to form a series/parallel connection among the batteries and control gates, and the batteries for supplying power. Because of the introduction of the control gates into the circuitry arrangement of the batteries according to the present invention, the device has an excellent controllability that makes the controlled battery power supply device not only outputting DC voltages with different levels and AC voltages with any given waveforms, but also enhancing substantially the quality of the power supply.

Description

FIELD OF THE INVENTION Field of the Invention

The present invention relates to a battery power supply device, and more particularly, to a power supply device capable of controlling battery output. Background of the invention

The existing battery power supply device connects batteries as components to form a fixed circuit to provide power to the outside. Therefore, it can only provide a fixed DC voltage output according to the determined connection method. In order to meet the user's requirements for different values or different types of power sources, other special devices must be added for conversion to meet the requirements. For example, in order to meet the user's requirements for DC step-up and step-down, a chopper must be added; and to meet the user's requirements for DC-to-AC, additional devices such as inverters can be added. This increases equipment and investment, increases energy consumption, and limits the extent of conversion.

Brief description of the invention

The object of the present invention is to provide a controllable battery power supply device, which can control the output of the battery power supply device. To achieve the above object, a controllable battery power source device is provided, including:

A control device for controlling the on-off state of each control door;

The control gate is connected in series / parallel between the batteries to form a series / parallel connection between the battery and the control gate.

A battery for providing electrical energy.

The control gate is a relay, a contactor, a bidirectional thyristor, a switchable thyristor, a power transistor, an insulated gate transistor, an electrostatic induction thyristor, an electrostatic induction transistor, and a MOS control thyristor.

In the present invention, when a control signal at the beginning and end of a selected battery string is appropriately controlled to be turned on or off, a required output voltage can be obtained at an output terminal of a controllable battery power supply device: The continuous control gate is continuously turned on, so that the amplitude and polarity of the output voltage of the controllable battery power device will be constant, that is, the specified DC voltage output is obtained from the controllable battery power device; this achieves DC Variable direct current (DC-DC). The use of a controllable battery power device can also achieve DC to AC (DC-AOo Because the invention introduces a control gate (control effect) in the circuit structure of the battery, it has excellent controllability, so that the controllable battery power The device can not only output DC voltages of different values and AC voltages of any given waveform, but also significantly improve the quality of the power supply.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic wiring diagram of a single-loop controllable battery power supply device.

Fig. 2 is a principle diagram of approximating a given sine wave with a step wave output from a controllable battery power device.

Fig. 3 is a principle wiring diagram of a controllable battery power device with multiple parallel branches.

FIG. 4 is a schematic diagram of a DC power drag system using the device of the present invention for speed regulation.

Detailed description of the invention

The task of the invention is accomplished as follows:

Connect n batteries with potential e as shown in Figure 1, where boxes 1, 2, 3, ... 2Ϊ -3, 2i-2,

2i -1 2 n, 2 n +1, 2 n +2 are control gates. When a signal is added to the control gate, the control gate will be turned on; when no signal is applied, the control gate will be closed. When different signals are added to the control gate, the output of the controllable battery power supply device is shown in the following table:

Note: i = 1, 2, 3 It can be seen from the table that if the control gates at the beginning and end of the selected battery string are given appropriate control signals to make them conductive, the required output of the controllable battery power device can be obtained. Output voltage: as long as the selected control gate is on continuously

As shown in Figure 2, if a sine wave voltage of a given amplitude and frequency is approximated by a step wave of equal amplitude steps of amplitude e, the corresponding time series of each step wave is tt ₂ , t ₃ . ...... As can be seen from the above table, the time will correspond to the case where the control gate 2i -1, 2 (i + 1) is turned on, and t, the time will correspond to the case where the control gate 2i -1 is made. The time when 2 (i + 2) is turned on will correspond to the time when the control gates 2i -3, 2 (i + 2) are turned on, and so on.

In other words, if the corresponding control gate conduction signal is given on the time series corresponding to each step wave string of the above step wave, each battery is connected to or cut out one by one in the forward direction or reversed according to the regulations. When the ground is connected or cut out to form the required battery string, the required stepped wave that rises or falls in the forward direction or rises or falls in the opposite direction with the increase of time t at the output end of the controllable battery power device can be obtained. Its envelope is sinusoidal, and as long as the selected sine wave amplitude U _m is large enough for the step wave amplitude e (the terminal voltage of each battery), the inner (outer) connection of the envelope The step wave can have a considerable step wave density, and the internal (external) step wave can approach a given envelope, that is, a sine wave, with sufficient accuracy. In other words, the error between the step wave and the sine wave is sufficiently small, and in fact, a satisfactory AC sine wave output is obtained at the output end of the controllable battery power device, which realizes DC-AC.

Similarly, for a specific waveform of any given form other than a sine wave, a specific output that is satisfactory can be obtained using a controllable battery power device.

If the output of the controllable battery power supply device is subjected to negative voltage feedback, the accuracy and stability of its output voltage can be further improved; if a filtering link is introduced in the controllable battery power supply device, the higher harmonics in its output waveform can be made To further reduce; if a current detection link is introduced into the controllable battery power device, so that when the load current increases to a certain value, the controllable battery power device that works in a single circuit can be automatically changed to a multi-circuit parallel operation to improve the controllability Current output capability of the battery power supply device; when the current is reduced to a certain value, the controllable battery power supply device that can work in parallel with multiple circuits automatically changes to single-loop operation, which can exert the strong load adaptation of the controllable battery power device Capacity, this can further improve the quality index of the controllable battery power device.

There are many ways to use a step wave to approximate a given waveform, such as a sine wave, such as:

1-When the effect of each forward or reverse step wave is superimposed, the top of the step wave exactly reaches the given waveform being approached. This method will make the step wave than the given waveform. Produce phase lag;

2. When each forward or reverse step wave action is superimposed, the bottom of the step wave just reaches the given waveform being approached. This method will make the step wave than the given waveform. Generate phase lead

3. When each forward or reverse step wave action is superimposed, the midpoint of the step wave just reaches the approximated waveform, that is, when the step wave and the given waveform are measured When the difference is equal to one-half step value, the positive or negative step wave is added, which means that the step wave is divided into two triangles by a given waveform, one outside the given waveform. Within a given waveform, the two triangles have the same area, so the area of the corresponding step wave is substantially equal to the area of the given waveform, and the phase of the step wave is basically synchronized with the given waveform. Therefore, this method of approximating a given waveform is more accurate, However, its calculation is more complicated than the former, and the corresponding calculation program may be longer.

When using a step wave to approximate a given waveform, such as a sine wave, an error occurs-

1. If a battery is not connected due to discharge during long-term use, and the voltage is not equal to (lower) than other batteries, then after it is connected, the superimposed value of the step wave will not meet the requirements of the given waveform. Value, and errors will occur. The processing method is: each time the forward or reverse step wave effect is superposed, the step value, that is, the voltage of the battery is measured and recorded, and the voltage of the battery with the lower voltage is measured. For u ,, calculate the difference Δυ from the specified value, and compare this difference with the given range. When it exceeds the specified value, it will send an alarm signal to request replacement; when it is continued to be used before it is replaced, To adjust the use parameters (access time) adaptively, the method is: when the battery with a slightly lower voltage needs to be connected, according to the magnitude of the difference AU calculated last time, the battery access Time, that is, when the difference between the measured step wave and the given waveform is equal to the voltage value of the battery to be connected, the battery with a slightly lower voltage can be connected in time to still ensure the step wave. The superposition value will reach the required value of the given waveform, so that the error of the superposition value of the step wave and the given waveform will approach zero.

2. If some batteries are discharged too much and the battery voltage is low during long-term use, then after they are connected, the superimposed value of the step wave, especially the amplitude value, will not meet the requirements of the given waveform. There will be errors. The solution is as follows: firstly, replace the battery with unqualified voltage in time to ensure that the technical specifications of the battery in use meet the requirements of the regulations; secondly, in addition to the normal operating battery pack, prepare some intact batteries as a backup. Once the above occurs In this case, an appropriate amount of the backup battery can be put in according to the magnitude of the error to compensate for the voltage drop in the battery pack.

In order to meet the needs of battery series change to parallel connection, the controllable battery power supply device can also be constructed according to the principle of FIG. 3. among them:

If the main control door is all on, it is no different from that shown in Figure 1. All the batteries are connected in a single circuit in series, and the output of the controllable battery power supply device is + ne;

If the main control gates DJDA are all disconnected, and control gates 1, 4; 5, 8; 9, 12; ...... are turned on, all the batteries are connected in parallel to the forward n-loop, but The output of the battery power supply is + e;

For example, the main control gates DiD ₂ D ₃ ...... are all disconnected, and the control gates 3, 2; 7, 6; 11, 10; ...... are turned on and all the batteries are connected in a reverse n loop In parallel, the output of the controllable battery power device is-e;

If the main control gates D ₂ D ₄ ...... are disconnected, D, D ₃ ...... are connected to control gates 1, 8; 9, 16; ......, then all batteries Two by two in series and then in parallel with each other, the output of the controllable battery power device is + 2e; and so on.

Figure 1 is the principle wiring diagram of a single-loop controllable battery power supply device. It's the electricity in series with each other. The two ends of the pool each add a shunting link composed of two upper and lower control gates in series. The control gate on the upper part of the shunting link is a natural number and odd number, which controls the on and off between this end of the battery and the output end 0, The control gate at the lower part of this shunting link is a natural even number, which controls the on / off between this end of the battery and the output end 0 ₂ ; all these control gates are turned on when there is a control signal, and they are closed when there is no control signal At any time, under the action of the control signal given by the control device, only one odd number and one even number of control gates can be turned on; in this way, they will connect a single-circuit battery pack between two conductive control gates. Connected to the output terminals 0, 0 ₂ ; using control signals to reselect the odd-numbered and even-numbered control gates that are turned on, the number and direction of the batteries in the battery pack between the turned-on control gates can be changed, thereby changing the output The magnitude and polarity of the voltage; if the output voltage and current and other parameters are fed back to the control device to regulate the deviation of the output parameter, it can ensure that the controllable battery power device can output the load required Form and quality, the quality of electricity. Where blocks 1, 2, 3 2i-3, 2i -2, 2i -1 ... 2 π,

2 η + 1 and 2 η + 2 are control gates;

Figure 2 shows the principle of approximating a given sine wave by using a stepped wave output from a controllable battery power device. The amplitudes of the medium-amplitude step waves in the figure are the battery voltage e, and the corresponding action time of each step wave is the sequence t ,, t ₂ , t ₃ ... The amplitude of the sine wave is Urn;

FIG. 3 is a principle wiring diagram of a controllable battery power supply device with multiple parallel branches, which is a shunting link consisting of two upper and lower control gates connected in series at each end of each battery connected in series; this shunting The control gate number in the upper part of the link is an odd natural number, which controls the on / off between this end of the battery and the output end 0 ,; the lower control gate number is an even number, which controls the end of the battery and the output end 0 ₂ Between each two batteries, a main control door numbered Di (i = 1, 2, 3, ...) controls the on and off of the serial path between the batteries before and after; for all For a control gate, it turns on when there is a control signal, and turns off when there is no control signal. At any time, under the action of the control signal given by the control device, there can be N (N is the number of parallel branches, N = 1, 2, 3....) The odd and N even-numbered control gates and the main control gate Di between the batteries between them are turned on to form N parallel paths of the battery pack; The excess paths between the battery packs are N-1 numbered D _k (Its subscripts k = L, 2L, 3L, ..., ('-1) L; where L = W / N is the number of batteries in series in each battery pack, W is the total number of batteries in use, and N is the parallel The number of branches) is cut off to remove the short-circuit branch; in this way, they connect the battery packs between the N control gates connected in parallel to the output terminals 0, 0 ₂ ; The number of the odd and even control gates and the corresponding main control gate DiD _k can change the number and direction of the batteries connected in series between the number of parallel branches and the control gates that are turned on, thereby changing the size of the output voltage and Polarity; if the output voltage and current and other parameters are fed back to the control device to regulate the deviation of the output parameters, it can ensure that the required form, quality and quality of the load can be output. Examples

Figure 4 shows a DC power drag system using a controllable battery power device to regulate the speed. All control doors (blocks labeled 1-8, A) in the controllable battery power supply are single-throw blades. The motor M is a separately excited DC motor. The excitation voltage is fixed. The armature end of the motor The voltage is provided by a controlled battery power supply. Changing the conduction mode of the control gate, that is, changing the armature terminal voltage, can achieve the purpose of speed regulation:

When the control gates 1 and 8 are turned on and other control gates are closed, the armature terminal voltage U = 2e and the corresponding speed is n _2. When the control gates 1 and 4 are on and the other control gates are closed, the armature terminal voltage U = e, the corresponding speed is: when the control doors 1 and 2 are on and the other control doors are closed, the armature terminal voltage U = 0 and the corresponding speed is n _Q = 0 when the control doors 2 and 3 are on and the other control doors are closed , Armature terminal voltage U =-e

When control gates A, 2, 7 are turned on and other control gates are closed, the armature terminal voltage U =-2e, where: η ₂ >〉 n. = ο. It can be seen that the use of a controllable battery power supply device can change the output voltage according to the will of the controller, thereby realizing the requirements of the speed regulation of a separately excited DC motor.

This is just an example of a simple system with a very low level of automation controlled manually. If you want to improve the level of automation, you can appropriately select the appropriate types of components to form the control gate (such as relays, contactors, bidirectional thyristors, power transistors, turn-off thyristors, insulated gate transistors, electrostatic induction thyristors, electrostatic induction transistor transistors, and M0S control thyristors. ), And correspondingly select a higher level of automation control devices (such as analog control devices, digital control devices, digital computers, etc.) and corresponding sensors to form an automation system.

In particular, if the technology of a solar cell and a controllable battery power supply device is combined, the solar energy can be directly converted into various forms of AC and DC electrical energy for use by users, and the development prospect is considerable.

If the controllable battery power supply device is combined with a smart device such as a computer, the controllable battery power supply device can take advantage of the characteristics that multiple control links in the controllable battery power supply device can accept the control of a smart device such as a computer and respond accordingly. Develop more and better new functions to make the controllable battery power supply device intelligent, and the development prospects are broader.

In summary, it can be seen that compared with the existing battery power supply device, the present invention introduces a control gate (control function) into the circuit structure of the battery, so that it has excellent controllability, thereby enabling the controllable battery power supply. The device can not only output DC voltages of different values and AC voltages of any given waveform, but also significantly improve the quality of the power supply.

Claims

Rights request

1. A controllable battery power source device, comprising:

A control device for controlling the on-off state of each control door;

The control door is connected in series / parallel between the batteries to form a series / parallel connection between the battery and the control door;

A battery for providing electrical energy.

2. The device according to claim 1, characterized in that the control gate is a relay, a contactor, a bidirectional thyristor, a switchable thyristor, a power transistor, an insulated gate transistor, an electrostatic induction thyristor, an electrostatic induction transistor crystal, M0S Control the thyristor.