CN104868550B - The cell activation control circuit of uninterrupted dc source - Google Patents

Abstract

A kind of cell activation the invention discloses uninterrupted dc source controls circuit, uninterrupted dc source includes battery management circuit, PWM controls drive circuit, DC DC converters and battery, cell activation control circuit includes the activation act circuit being sequentially connected, activation signals detects circuit and activation signals isolation circuit, and for detecting circuit for activation signals, activation signals isolation circuit and battery management circuit provide the reference voltage circuit of reference voltage, the compensating end of PWM control drive circuits connects with the output end of activation signals isolation circuit, the comparison voltage input of battery management circuit connects with the output end of activation signals detection circuit.Cost of implementation of the present invention is low, using easy to operate, can effectively extend the service life of battery, improves the service efficiency of battery, practical, is easy to promote the use of.

Description

Battery Activation Control Circuit for Uninterruptible DC Power Supply

technical field

The invention belongs to the technical field of power supplies, and in particular relates to a battery activation control circuit of an uninterrupted direct current power supply.

Background technique

With the rapid development of power transmission and communication technologies, in order to prevent equipment damage, data loss, and work interruption caused by power outages, voltage fluctuations, and clutter interference, the application of uninterruptible DC power supplies is becoming increasingly important. As the energy storage device of the uninterrupted DC power supply, the battery is one of the key equipment to ensure the normal operation of the system. Its function is to provide electric energy to the load when the mains power is lost or the quality of the mains power exceeds the allowable range of the electrical equipment. However, batteries are expensive consumables. Therefore, how to reasonably use and manage the battery to prolong its service life has been a concern of UPS manufacturers and users for many years.

It is understood that batteries are widely used in electric power, communication, instrumentation, UPS power supply and other fields at present. As we all know, the float charge of the battery has a very important impact on the life of the battery. If the battery is in the float charge state for a long time, it is easy to cause electrode vulcanization, mainly due to the vulcanization failure of the negative active material, the performance decline, and the increase of the internal resistance of the battery. Capacity attenuation, especially when the float charge voltage of the battery exceeds a certain value, the grid corrosion phenomenon will be further aggravated, and the oxygen and hydrogen in the battery will generate high pressure, which will be discharged through the air valve, causing the battery to lose water, and the corrosion of the positive electrode means As the battery loses water, it will further aggravate the deterioration of the battery and shorten its life. If the float charge voltage exceeds a certain range, the increased float charge current will generate more surplus gas, which will hinder the recombination of oxygen at the negative electrode, thereby weakening the cycle function of oxygen and seriously reducing the life span. The method to solve the above problems can be to test the battery capacity by manually calculating the battery capacity, and determine whether the battery capacity meets the requirements according to the test results, but this method is too complicated, requires high personnel, and there are often large deviations in the calculation results . At present, for the problem of battery life reduction and capacity attenuation caused by long-term floating charging, regular charging and discharging of the battery is often used to maintain the activity of the negative active material and prevent the battery life from being shortened due to electrode vulcanization and battery deterioration, that is, Battery activated. By activating and starting the battery, it is conducive to the recovery and maintenance of the battery capacity, greatly extending the service life of the battery, and it is safe, reliable, cost-effective, and adaptable to a wide range of environments. In recent years, the activation technologies at home and abroad mainly include the following types: (1) high-current charging method. When large lead sulfate crystal grains generate resistance during charging, use high current energy to electrolyze and activate it to prevent plate vulcanization. This method of eliminating vulcanization can only obtain a temporary effect, and will cause aggravated water loss and softening of the positive plate during the process of eliminating vulcanization. It is difficult to prolong the battery life, and it should only play an auxiliary role. (2) Negative pulse charging method. The design principle is to add a negative pulse during the charging process, which has an effect on reducing the temperature rise and also has a certain effect on preventing the vulcanization of the plate, but it is not obvious. Although it is widely used at present, it is an elimination method. At present, in various application fields of batteries, in addition to requiring power saving and long service life, it is also necessary to ensure uninterrupted power supply. Because the power grid will inevitably have blackout accidents, it is urgent to propose an improved battery activation control circuit for uninterruptible DC power supply.

Contents of the invention

The technical problem to be solved by the present invention is to provide a reasonable design, convenient implementation, low cost, convenient use and operation, which can effectively prolong the service life of the storage battery and improve the use efficiency of the storage battery. A battery activation control circuit for a strong uninterruptible DC power supply.

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a battery activation control circuit for an uninterrupted DC power supply, the uninterrupted DC power supply includes a battery management circuit, a PWM control drive circuit and a battery connected to the PWM control drive circuit A DC-DC converter, and a storage battery whose positive pole is connected to the output end of the DC-DC converter and whose negative pole is connected to the battery management circuit, wherein the battery activation control circuit includes an activation operation circuit connected in sequence, an activation signal The detection circuit and the activation signal isolation circuit, and the reference voltage circuit for providing the reference voltage for the activation signal detection circuit, the activation signal isolation circuit and the battery management circuit, the compensation end of the PWM control driving circuit and the output end of the activation signal isolation circuit connected, the comparison voltage input terminal of the battery management circuit is connected to the output terminal of the activation signal detection circuit;

The activation operation circuit includes an activation start button S3, a transistor Q8 and a resistor R11, one end of the resistor R11 is the remote control signal input terminal of the activation operation circuit, and the base of the transistor Q8 is connected to the other end of the resistor R11, so A resistor R12 and a capacitor C2 connected in parallel are connected between the base and the emitter of the transistor Q8, the collector of the transistor Q8 is connected to the output terminal Vo of the DC-DC converter through the resistor R13 and the resistor R10 connected in series, and the resistor R13 The series node of the resistor R10 is grounded through the parallel resistor R14 and the capacitor C3, the series node of the resistor R13 and the resistor R10 is the output terminal of the activation operation circuit, and the activation start button S3 is connected to the collector of the triode Q8 and Between the emitters, the emitter of the triode Q8 is connected to the output terminal Vo of the DC-DC converter;

The activation signal detection circuit includes a comparator U1, the non-inverting input terminal of the comparator U1 is connected to the reference voltage output terminal of the reference voltage circuit through a resistor R5, and grounded through a resistor R3, and the inverting input terminal of the comparator U1 is connected to The output terminal of the activation operation circuit, a resistor R6 is connected between the output terminal of the comparator U1 and the non-inverting input terminal, and the output terminal of the comparator U1 is the output terminal of the activation signal detection circuit;

The activation signal isolation circuit includes an optocoupler isolation chip U2 and a triode Q2, the anode of the optocoupler isolation chip U2 is connected to the reference voltage output terminal of the reference voltage circuit through a resistor R4, and the cathode of the optocoupler isolation chip U2 is connected to the activation signal The output terminal of the detection circuit, the collector of the optocoupler isolation chip U2 is connected to the base of the triode Q2, the emitter of the optocoupler isolation chip U2 and the collector of the triode Q2 are both grounded, and the base of the triode Q2 is connected to the ground. A resistor R2 is connected between the emitters, and the emitter of the triode Q2 is the output end of the activation signal isolation circuit.

The battery activation control circuit of the above uninterrupted DC power supply is characterized in that: the reference voltage circuit is composed of an integrated three-terminal voltage regulator chip TL431, a resistor R16, a resistor R17 and a resistor R18, and the resistor R16, resistor R17 and resistor R18 One end of the series connection is connected to the output terminal Vo of the DC-DC converter, and the other end is grounded; the series node of the resistor R16 and the resistor R17 is connected to the cathode of the integrated three-terminal voltage regulator chip TL431, and the integrated three-terminal voltage regulator chip TL431 The cathode of the reference voltage circuit is the reference voltage output end of the reference voltage circuit, the series node of the resistor R17 and the resistor R18 is connected to the reference electrode of the integrated three-terminal voltage stabilizing chip TL431, and the anode of the integrated three-terminal voltage stabilizing chip TL431 is grounded.

The battery activation control circuit of the above uninterruptible DC power supply is characterized in that: the PWM control drive circuit includes a controller chip UC3845 and a resistor R1, and the first pin of the controller chip UC3845 is the compensation terminal of the PWM control drive circuit , one end of the resistor R1 is connected to the sixth pin of the controller chip UC3845, and the other end of the resistor R1 is the output end of the PWM control driving circuit.

The battery activation control circuit of the above uninterruptible DC power supply is characterized in that: the DC-DC converter includes a transformer T1, a MOSFET switch Q3 and a diode D1, and the gate of the MOSFET switch Q3 is the DC-DC converter. The control signal input terminal, the source of the MOSFET switching tube Q3 is grounded, one end of the primary coil of the transformer T1 is the power input terminal of the DC-DC converter and is connected to the output terminal of the external power supply, the transformer T1 The other end of the primary coil is connected to the drain of the MOSFET switch Q3, one end of the secondary coil of the transformer T1 is connected to the anode of the diode D1, and the cathode of the diode D1 is the output terminal Vo of the DC-DC converter , and the capacitor C1 is grounded, and the other end of the secondary coil of the transformer T1 is grounded.

The battery activation control circuit of the above uninterrupted DC power supply is characterized in that: the battery management circuit includes a MOSFET switch tube Q4 and an optocoupler isolating chip U5, and the anode of the optocoupler isolating chip U5 is connected to the reference of the reference voltage circuit through a resistor R20 Voltage output terminal, the cathode of the optocoupler isolation chip U5 is the comparative voltage input terminal of the battery management circuit and connected to the output terminal of the activation signal detection circuit, and the collector of the optocoupler isolation chip U5 is connected to DC-DC conversion through a resistor R19 The output terminal Vo of the device, the gate of the MOSFET switch Q4 is connected to the emitter of the optocoupler isolation chip U5, the drain of the MOSFET switch Q4 is grounded, the negative pole of the storage battery is connected to the source of the MOSFET switch Q4 The poles are connected, and a resistor R21 is connected between the source and the gate of the MOSFET switching tube Q4.

The present invention also provides a method for designing a battery activation control circuit for an uninterrupted DC power supply with simple method steps, convenient implementation, and strong practicability, which is characterized in that the method includes the following steps:

Step 1, select resistor R16, resistor R17 and resistor R18 of suitable parameters to form the reference voltage circuit, the specific process is as follows:

Step 101, select the resistance value of resistor R16 according to 1kΩ≤R16≤3kΩ;

Step 102, according to the formula Select the resistance value of the resistor R18; wherein, U _R18 is the voltage at both ends of the resistor R18 and U _R18 =2.5V, I _U4 is the current of the reference pole of the integrated three-terminal voltage regulator chip TL431 and I _U4 =2uA;

Step 103, according to the formula Select the resistance value of the resistor R17, wherein, V _ref is the reference voltage output by the set reference voltage circuit;

Step 2. Connect the integrated three-terminal voltage regulator chip TL431, resistor R16, resistor R17 and resistor R18 to form a reference voltage circuit. The specific process is:

Step 201, connecting the resistor R16, the resistor R17 and the resistor R18 in series, and connecting one end of the series connection to the output terminal Vo of the DC-DC converter, and the other end to ground;

Step 202, connecting the series node of the resistor R16 and the resistor R17 to the cathode of the integrated three-terminal voltage regulator chip TL431;

Step 203, connecting the series node of the resistor R17 and the resistor R18 to the reference pole of the integrated three-terminal voltage regulator chip TL431;

Step 204, ground the anode of the integrated three-terminal voltage stabilizing chip TL431, and lead out the cathode of the integrated three-terminal voltage stabilizing chip TL431 as the reference voltage output terminal of the reference voltage circuit;

Step 3, select resistance R10, resistance R11, resistance R12, resistance R13 and resistance R14, and electric capacity C2 and electric capacity C3 of the suitable parameter of forming activation operation circuit; Its concrete process is as follows:

Step 301, according to the formula Select the resistance value of resistor R10 and resistor R14, wherein, V _-1 is the voltage output from the output terminal of the activation operation circuit when the activation start button S3 is not pressed, and the remote control signal input end of the activation operation circuit is suspended; V _O is the battery activation The voltage output by the output terminal of the DC-DC converter when it is not started;

Step 302, according to the formula Select the resistance value of resistor R13, wherein, V _-2 is the voltage output by the output end of the activation operation circuit when the activation start button S3 is pressed or the remote control signal input end of the activation operation circuit receives the low level emitted by the remote controller;

Step 303, according to the formula Select the resistance value of resistor R11 and resistor R12, wherein, V _R12 is the voltage across the resistor R12 when the remote control signal input terminal of the activation operation circuit receives the low level emitted by the remote controller, V _O1 is the discharge termination voltage of the storage battery, and V _be is The emitter junction voltage of the transistor Q8 has a value of 0.7V;

Step 304, according to the formula Select the capacitance value of the capacitor C2, where t is the delay action time for activating the operating circuit after the activation start button S3 is pressed or the remote control signal input terminal of the activation operation circuit receives the low level emitted by the remote controller, u _C2 (t) is The remote control signal input terminal of the activation operation circuit receives the low level emitted by the remote control and the voltage on the capacitor C2 after the delay action time t, e is a natural constant;

Step 305, according to the formula Select the capacitance of the capacitor C3, where u _C3 (t) is the voltage on the capacitor C3 after the power supply is powered on and the delay action time t has elapsed;

Step 4. Connect activation start button S3, transistor Q8, resistor R10, resistor R11, resistor R12, resistor R13 and resistor R14, and capacitor C2 and capacitor C3 to form an activation operation circuit. The specific process is as follows:

Step 401, leading out one end of the resistor R11 as the remote control signal input end of the activation operation circuit, and connecting the other end of the resistor R11 to the base of the transistor Q8;

Step 402, connecting the resistor R12 and the capacitor C2 in parallel between the base and the emitter of the transistor Q8;

Step 403, connecting one end of the resistor R13 and the resistor R10 in series to the collector of the transistor Q8, and the other end to the output terminal Vo of the DC-DC converter;

Step 404, connect one end of the parallel connection of the resistor R14 and the capacitor C3 to the series node of the resistor R13 and the resistor R10, and connect the other end to the ground;

Step 405, leading out the series node of the resistor R13 and the resistor R10 as the output terminal of the activation operation circuit;

Step 406, connecting the activation start button S3 between the collector and the emitter of the triode Q8;

Step 407, connect the emitter of the transistor Q8 to the output terminal Vo of the DC-DC converter;

Step 5, select resistance R3, resistance R5 and resistance R6 of the suitable parameter that forms activation signal detection circuit, its specific process is:

According to the formula Select the resistance values of resistor R3, resistor R5 and resistor R6, wherein, V ₊₁ is the voltage of the non-inverting input terminal of comparator U1 when the battery activation is not started, V _1H is the high-level voltage output by the output terminal of comparator U1 and Equal to the power supply voltage of comparator U1; V ₊₂ is the voltage of the non-inverting input terminal of comparator U1 when the battery is activated and started;

Step 6. Connect comparator U1, resistor R3, resistor R5 and resistor R6 to form an activation signal detection circuit. The specific process is as follows:

Step 601, connect one end of the resistor R3 and one end of the resistor R5 to the non-inverting input terminal of the comparator U1, ground the other end of the resistor R3, and lead the other end of the resistor R5 as the reference voltage input terminal of the activation signal detection circuit;

Step 602, lead out the inverting input terminal of the comparator U1 as the comparison voltage input terminal of the activation signal detection circuit;

Step 603, connecting the resistor R6 between the output terminal of the comparator U1 and the non-inverting input terminal;

Step 604, leading out the output terminal of the comparator U1 as the output terminal of the activation signal detection circuit;

Step 7, select the resistance R2 and the resistance R4 of the suitable parameters that form the activation signal isolation circuit, and its specific process is as follows:

Step 701, according to the formula Select the resistance value of resistor R2, where, Be the current output by the output terminal of the activation signal detection circuit, V _be ' is the emitter junction voltage of the triode Q2 and the value is 0.7V;

Step 702, according to the formula Select the resistance value of resistor R4, where, is the input forward voltage drop of optocoupler isolation chip U2, It is the forward current of optocoupler isolation chip U2.

Step 8. Connect the optocoupler isolation chip U2, transistor Q2, resistor R2 and resistor R4 to form an activation signal isolation circuit. The specific process is as follows:

Step 801, connect one end of the resistor R4 to the anode of the optocoupler isolation chip U2, and lead out the other end as a reference voltage input end for activating the signal isolation circuit;

Step 802, leading out the cathode of the optocoupler isolation chip U2 as a comparison voltage input terminal of the activation signal isolation circuit;

Step 803, connect the base of the triode Q2 to the collector of the optocoupler isolation chip U2, and ground the emitter of the optocoupler isolation chip U2 and the collector of the triode Q2;

Step 804, connecting the resistor R2 between the base and the emitter of the triode Q2;

Step 805, lead out the emitter of the triode Q2 as the output terminal of the activation signal isolation circuit;

Step 9, connect the battery activation control circuit, the specific process is:

Step 901, connect the reference voltage input terminal of the activation signal detection circuit to the reference voltage output terminal of the reference voltage circuit, and connect the comparison voltage input terminal of the activation signal detection circuit to the output terminal of the activation operation circuit;

Step 902, connect the output end of the activation signal detection circuit to the comparison voltage input end of the battery management circuit;

Step 903, connect the reference voltage input terminal of the activation signal isolation circuit to the reference voltage output terminal of the reference voltage circuit, and connect the comparison voltage input terminal of the activation signal isolation circuit to the output terminal of the activation signal detection circuit;

Step 904, connect the output terminal of the activation signal isolation circuit to the compensation terminal of the PWM control driving circuit.

Compared with the prior art, the present invention has the following advantages:

1. The battery activation control circuit of the present invention has simple structure, reasonable design, convenient implementation, low cost, and convenient operation.

2. The design method of the battery activation control circuit of the present invention has simple method steps, is convenient to realize, and has strong practicability.

3. The present invention can activate the battery in two ways: manual activation and remote activation, and act before the vulcanization of the battery occurs, which can effectively prevent the vulcanization of the plate, effectively prolong the service life of the battery, and is safe and reliable , cost-effective, improves the use efficiency of the battery, and is of great significance to the development prospect and application of the battery.

4. The present invention can be applied to switching power supplies or related electronic products in uninterrupted power supply environments such as electric power, communications, banks, hospitals, security, etc., and can adapt to a wide range of environments.

5. The use effect of the present invention is good, and it is convenient to popularize and use.

To sum up, the present invention is reasonable in design, convenient in implementation, low in cost, convenient in use and operation, can effectively prolong the service life of the storage battery, improve the use efficiency of the storage battery, has strong practicability, good use effect, and is convenient for popularization and use.

The technical solution of the present invention will be described in further detail below with reference to the drawings and embodiments.

Description of drawings

Fig. 1 is the block diagram of circuit principle of the present invention.

Fig. 2 is a schematic circuit diagram of the present invention.

Explanation of reference signs:

1—Activation operation circuit; 2—Activation signal detection circuit; 3—Activation signal isolation circuit;

4—reference voltage circuit; 5—PWM control drive circuit; 6—DC-DC converter;

7—battery management circuit; 8—battery battery.

detailed description

As shown in Fig. 1 and Fig. 2, the battery activation control circuit of the uninterruptible direct current power supply of the present invention, described uninterruptible direct current power supply comprises battery management circuit 7, PWM control driving circuit 5 and the DC connected with PWM control driving circuit 5 - a DC converter 6, and a storage battery 8 whose positive pole is connected to the output end of the DC-DC converter 6 and whose negative pole is connected to the battery management circuit 7, the battery activation control circuit includes an activation operation circuit 1 connected in sequence, an activation signal The detection circuit 2 and the activation signal isolation circuit 3, and the reference voltage circuit 4 used to provide the reference voltage for the activation signal detection circuit 2, the activation signal isolation circuit 3 and the battery management circuit 7, the compensation terminal of the PWM control drive circuit 5 and The output terminals of the activation signal isolation circuit 3 are connected, and the comparison voltage input terminal of the battery management circuit 7 is connected with the output terminal of the activation signal detection circuit 2;

As shown in Figure 2, the activation operation circuit 1 includes an activation start button S3, a transistor Q8 and a resistor R11, one end of the resistor R11 is the remote control signal input terminal HK of the activation operation circuit 1, and the base of the transistor Q8 is connected to the The other end of the resistor R11 is connected, the base and the emitter of the triode Q8 are connected in parallel with a resistor R12 and a capacitor C2, and the collector of the triode Q8 is connected to the DC-DC converter through the series connected resistor R13 and resistor R10 6 output terminal Vo, the series node of the resistor R13 and the resistor R10 is grounded through the parallel resistor R14 and the capacitor C3, the series node of the resistor R13 and the resistor R10 is the output terminal of the activation operation circuit 1, and the activation The start button S3 is connected between the collector and the emitter of the triode Q8, and the emitter of the triode Q8 is connected to the output terminal Vo of the DC-DC converter 6; wherein, the resistor R12 is the base bias resistor of the triode Q8, activated The function of capacitor C2 and resistor R12 in the operation circuit 1 is to ensure that the triode Q8 can be turned off reliably when the remote control signal input terminal HK of the activation operation circuit 1 is suspended; at the same time, when the remote control signal input terminal HK of the activation operation circuit 1 receives the remote control When the transistor Q8 needs to be turned on due to the low level emitted by the device, it must be required to maintain the low level of the remote control signal input terminal HK of the activation operation circuit 1 for a period of time (such as a few ms) before the transistor Q8 can be turned on. It can prevent misoperation due to the instantaneous interference low level of the remote control signal input terminal HK of the activation operation circuit 1; the function of the capacitor C3 in the activation operation circuit 1 is to ensure that the inverting input terminal of the comparator U1 is low at the moment when the power is turned on Level, and can last for a period of time (such as several ms), to ensure that the output of the comparator U1 is at a high level at the moment when the power is turned on, so as to ensure that the uninterrupted DC power supply can work normally after being powered on.

As shown in Figure 2, the activation signal detection circuit 2 includes a comparator U1, the non-inverting input terminal of the comparator U1 is connected to the reference voltage output terminal Vref of the reference voltage circuit 4 through a resistor R5, and grounded through a resistor R3, the The inverting input terminal of the comparator U1 is connected to the output terminal of the activation operation circuit 1, a resistor R6 is connected between the output terminal of the comparator U1 and the non-inverting input terminal, and the output terminal of the comparator U1 is the activation signal detection circuit 2. Output terminal; during specific wiring, the power supply terminal of the comparator U1 is connected to the reference voltage output terminal Vref of the reference voltage circuit 4, and the ground terminal of the comparator U1 is grounded;

As shown in Figure 2, the activation signal isolation circuit 3 includes an optocoupler isolation chip U2 and a transistor Q2, the anode of the optocoupler isolation chip U2 is connected to the reference voltage output terminal Vref of the reference voltage circuit 4 through a resistor R4, and the optocoupler isolation chip U2 is connected to the reference voltage output terminal Vref of the reference voltage circuit 4 through a resistor R4. The cathode of the coupling isolation chip U2 is connected to the output end of the activation signal detection circuit 2, the collector of the optocoupler isolation chip U2 is connected to the base of the triode Q2, and the emitter of the optocoupler isolation chip U2 and the collector of the triode Q2 are both grounded, a resistor R2 is connected between the base and emitter of the triode Q2 , and the emitter of the triode Q2 is the output end of the activation signal isolation circuit 3 .

As shown in Figure 2, in this embodiment, the reference voltage circuit 4 is composed of an integrated three-terminal voltage regulator chip TL431, a resistor R16, a resistor R17 and a resistor R18, one end of which the resistor R16, the resistor R17 and the resistor R18 are connected in series connected to the output terminal Vo of the DC-DC converter 6, and the other end is grounded; the series node of the resistor R16 and the resistor R17 is connected to the cathode of the integrated three-terminal voltage stabilizing chip TL431, and the cathode of the integrated three-terminal voltage stabilizing chip TL431 is The reference voltage output terminal Vref of the reference voltage circuit 4, the series node of the resistor R17 and the resistor R18 are connected to the reference pole of the integrated three-terminal voltage stabilizing chip TL431, and the anode of the integrated three-terminal voltage stabilizing chip TL431 is grounded.

As shown in Figure 2, in this embodiment, the PWM control drive circuit 5 includes a controller chip UC3845 and a resistor R1, the first pin of the controller chip UC3845 is the compensation end of the PWM control drive circuit 5, the One end of the resistor R1 is connected to the sixth pin of the controller chip UC3845, and the other end of the resistor R1 is the output end of the PWM control driving circuit 5 .

As shown in Figure 2, in this embodiment, the DC-DC converter 6 includes a transformer T1, a MOSFET switch Q3 and a diode D1, and the gate of the MOSFET switch Q3 is the control signal input of the DC-DC converter 6 terminal, the source of the MOSFET switching tube Q3 is grounded, one end of the primary coil of the transformer T1 is the power input terminal Vi+ of the DC-DC converter 6 and is connected to the output terminal of the external power supply, the primary coil of the transformer T1 The other end of the coil is connected to the drain of the MOSFET switch tube Q3, one end of the secondary coil of the transformer T1 is connected to the anode of the diode D1, and the cathode of the diode D1 is the output terminal Vo of the DC-DC converter 6 , and the capacitor C1 is grounded, and the other end of the secondary coil of the transformer T1 is grounded. During specific implementation, the load RL is connected between the output terminal Vo of the DC-DC converter 6 and the ground.

As shown in Figure 2, in this embodiment, the battery management circuit 7 includes a MOSFET switch tube Q4 and an optocoupler isolation chip U5, the anode of the optocoupler isolation chip U5 is connected to the reference voltage output terminal of the reference voltage circuit 4 through a resistor R20 Vref, the cathode of the optocoupler isolation chip U5 is the comparison voltage input terminal of the battery management circuit 7 and connected to the output terminal of the activation signal detection circuit 2, and the collector of the optocoupler isolation chip U5 is connected to DC-DC conversion through a resistor R19 The output terminal Vo of the device 6, the gate of the MOSFET switch Q4 is connected to the emitter of the optocoupler isolation chip U5, the drain of the MOSFET switch Q4 is grounded, and the negative pole of the battery 8 is connected to the MOSFET switch Q4 The source of the MOSFET switch Q4 is connected with a resistor R21 between the source and the gate.

During specific implementation, the resistance value selection method of the resistor R19, the resistor R20 and the resistor R21 in the battery management circuit 7 is: first, according to the formula Select the resistance value of the resistor R20, wherein, V _ref is the set reference voltage output by the reference voltage circuit 4, is the input forward voltage drop of optocoupler isolation chip U5, is the forward current of optocoupler isolation chip U5; then, according to the formula Select the resistance values of resistor R19 and resistor R21, where, For the current flowing into the collector of the optocoupler isolation chip U5, V _G is the grid voltage of the MOSFET switch tube Q4, and V _O is the voltage output by the output terminal of the DC-DC converter 6 when the battery activation is not started;

In this embodiment, V _ref =12V, The resistance value of resistor R20 is selected as 3.6kΩ.

In this example, V _G =12.4V, V _O =26V, the resistance value of the resistor R19 is selected as 4.7kΩ, and the resistance value of the resistor R21 is selected as 4.3kΩ.

Through the above value selection method, it can be guaranteed that when the output terminal of the activation signal detection circuit 2 outputs a low level, the emitter output of the optocoupler isolation chip U5 is a high level, so that the MOSFET switch tube Q4 is turned on, and the battery 8 starts to discharge .

During specific implementation, the activation operation circuit 1 , the activation signal detection circuit 2 and the reference voltage circuit 4 all share the ground with the secondary coil of the transformer T1 , and the activation signal isolation circuit 3 shares the ground with the primary coil of the transformer T1 . The models of the optocoupler isolation chip U2 and the optocoupler isolation chip U5 are both PC817.

When the battery activation control circuit of the present invention is used, the reference voltage circuit 4 provides the reference voltage V _ref for the activation signal detection circuit 2, and the activation is controlled by the activation start button S3 in the activation operation circuit 1 and the remote control signal received by the remote control signal input terminal HK. The output level of the signal detection circuit 2 is high or low, and then the battery 8 is activated by activating the signal isolation circuit 3 , the PWM control drive circuit 5 and the battery management circuit 7 . The specific working principle is:

(1) During the entire working process, the reference voltage circuit 4 provides the reference voltage V _ref for the activation signal detection circuit 2, the activation signal isolation circuit 3 and the battery management circuit 7;

(2) When the battery activation is not started, that is, when the activation start button S3 is not pressed and the remote control signal input terminal HK of the activation operation circuit 1 is suspended, the voltage V _-1 of the inverting input terminal of the comparator U1 in the activation signal detection circuit 2 Lower than the non-inverting input voltage V ₊₁ , the output of the comparator U1 is at a high level, the optocoupler isolation chip U2 does not work, the transistor Q2 is turned off, and the PWM control drive circuit 5 and the DC-DC converter 6 work normally;

(3) At the moment of battery activation and start, that is, when the activation start button S3 is pressed or the remote control signal input terminal HK of the activation operation circuit 1 receives the low level emitted by the remote control, the inverting input of the comparator U1 in the activation signal detection circuit 2 terminal voltage V _-2 is higher than the voltage V ₊₁ of the non-inverting input terminal, the output terminal of the comparator U1 is low level, so that the voltage of the non-inverting input terminal of the comparator U1 is reduced from V ₊₁ to V ₊₂ , and obviously V _-2 >V ₊₂ , so after the activation start button S3 is released or the remote signal input terminal HK of the activation operation circuit 1 is suspended, the voltage V _-1 of the inverting input terminal of the comparator U1 is still greater than the voltage V ₊ of the non-inverting input terminal ₂ , keep the output of comparator U1 at low level; when the output of comparator U1 is at low level, on the one hand, the optocoupler isolation chip U2 in the activation signal isolation circuit 3 starts to work, so that the triode Q2 is saturated and turned on, The first pin voltage of the controller chip UC3845 in the PWM control drive circuit 5 is pulled down, the PWM control drive circuit 5 outputs a low level, the MOSFET switch tube Q3 is turned off, the DC-DC converter 6 stops working, and the battery 8 stops On the other hand, the optocoupler isolation chip U5 in the battery management circuit 7 also starts to work, so that the emitter output of the optocoupler isolation chip U5 is at a high level, the MOSFET switch tube Q4 is turned on, and the battery 8 passes through the load RL and The MOSFET switch tube Q4 forms a discharge circuit and starts to discharge;

(4) During battery activation, the non-inverting input terminal voltage V ₊ 2 of the comparator U1 in the activation signal detection circuit 2 remains unchanged, and the inverting input terminal voltage V-2 of the comparator U1 in the activation signal detection circuit ₂ increases with the battery 8 decreases with the decrease of the voltage, but always satisfies V _-2 >V ₊₂ ;

(5) At the end of battery activation, as the voltage of the battery 8 decreases, when the voltage V _-2 of the inverting input terminal of the comparator U1 decreases to satisfy V _-2 <V ₊₂ , the output of the comparator U1 The terminal output is high level, and the battery activation process is over. On the one hand, the optocoupler isolation chip U5 in the battery management circuit 7 stops working, so that the emitter output of the optocoupler isolation chip U5 is low level, and the MOSFET switch Q4 is turned off. off, the battery 8 stops discharging; on the other hand, the optocoupler isolation chip U2 in the activation signal isolation circuit 3 also stops working, so that the triode Q2 is turned off, and the PWM control driving circuit 5 and the DC-DC converter 6 resume normal operation , start charging the battery 8 again.

The design method of the battery activation control circuit of the uninterrupted DC power supply of the present invention comprises the following steps:

Step 1, select resistance R16, resistance R17 and resistance R18 that form the suitable parameters of the reference voltage circuit 4, the specific process is as follows:

Step 101, select the resistance value of resistor R16 according to 1kΩ≤R16≤3kΩ;

In this embodiment, the resistance value of the resistor R16 is selected as 2kΩ;

Step 102, according to the formula Select the resistance value of the resistor R18; wherein, U _R18 is the voltage at both ends of the resistor R18 and U _R18 =2.5V, I _U4 is the current of the reference pole of the integrated three-terminal voltage regulator chip TL431 and I _U4 =2uA;

formula It means that the current on the resistor R18 is greater than 100 times the current flowing into the reference electrode of the integrated three-terminal voltage regulator chip TL431, which can prevent the current of the reference electrode of the integrated three-terminal voltage regulator chip TL431 from affecting the voltage division ratio, and avoid The impact of noise; in specific implementation, it should also meet the Under the condition of selecting the resistance R18 whose resistance value is as large as possible, the standby power consumption can be reduced like this; in this embodiment, according to the formula Select the resistance value of resistor R18 as 10kΩ;

Step 103, according to the formula Select the resistance value of the resistor R17, wherein V _ref is the set reference voltage output by the reference voltage circuit 4;

In this embodiment, V _ref =12V, according to the formula Calculated to get R17=38Ω, so the resistance value of resistor R17 is selected as 38kΩ;

Step 2. Connect the integrated three-terminal voltage regulator chip TL431, resistor R16, resistor R17 and resistor R18 to form the reference voltage circuit 4. The specific process is as follows:

Step 201, connecting the resistor R16, the resistor R17 and the resistor R18 in series, and connecting one end of the series connection to the output terminal Vo of the DC-DC converter 6, and the other end to ground;

Step 202, connecting the series node of the resistor R16 and the resistor R17 to the cathode of the integrated three-terminal voltage regulator chip TL431;

Step 203, connecting the series node of the resistor R17 and the resistor R18 to the reference pole of the integrated three-terminal voltage regulator chip TL431;

Step 204, ground the anode of the integrated three-terminal voltage regulator chip TL431, and lead out the cathode of the integrated three-terminal voltage regulator chip TL431 as the reference voltage output terminal Vref of the reference voltage circuit 4;

Step 3, select resistance R10, resistance R11, resistance R12, resistance R13 and resistance R14, and electric capacity C2 and electric capacity C3 of the suitable parameter of forming activation operation circuit 1; Its concrete process is as follows:

Step 301, according to the formula Select the resistance value of resistor R10 and resistor R14, wherein, V _-1 is the voltage output by the output terminal of the activation operation circuit 1 when the activation start button S3 is not pressed, and the remote control signal input terminal HK of the activation operation circuit 1 is suspended, that is, the battery The voltage of the inverting input terminal of the comparator U1 when the activation is not started; V _O is the voltage output by the output terminal of the DC-DC converter 6 when the battery activation is not started;

In this embodiment, V _-1 =4.1V, V _O =26V, according to the formula Select the resistance value of resistor R14 as 6.8kΩ, and the resistance value of resistor R10 as 36kΩ;

Step 302, according to the formula Select the resistance value of the resistor R13, wherein, V _-2 is the voltage output by the output terminal of the activation operation circuit 1 when the activation start button S3 is pressed or the remote control signal input terminal HK of the activation operation circuit 1 receives the low level transmitted by the remote controller, That is, the voltage at the inverting input terminal of the comparator U1 when the battery is activated and started;

In this embodiment, V _-2 =7.1V, according to the formula Select the resistance value of resistor R13 as 36kΩ;

Step 303, according to the formula Select the resistance values of the resistor R11 and the resistor R12, wherein VR12 is the voltage at both ends of the resistor _R12 when the remote control signal input terminal HK of the activation operation circuit 1 receives the low level emitted by the remote controller, and V _O1 is the discharge termination voltage of the storage battery 8, V _be is the emitter junction voltage of the transistor Q8 and its value is 0.7V;

In this embodiment, V _O1 =22V, according to the formula Select the resistance value of resistor R11 to be 36kΩ, and the resistance value of resistor R12 to be 2kΩ; the formula It means that when the remote control signal input terminal HK of the activation operation circuit 1 receives the low level transmitted by the remote control, the voltage across the resistor R12 is greater than 0.7V, which can ensure that the output voltage at the output terminal of the DC-DC converter 6 is greater than V _O1 At this time, the battery can be activated normally by receiving the low level emitted by the remote controller through the remote control signal input terminal HK of the activation operation circuit 1;

Step 304, according to the formula Select the capacitance value of the capacitor C2, wherein, t is the delay action time for activating the operation circuit 1 after the activation start button S3 is pressed or the remote control signal input terminal HK of the activation operation circuit 1 receives the low level transmitted by the remote controller, u _C2 ( t) is the voltage on the capacitor C2 after the remote control signal input terminal HK of the activation operation circuit 1 receives the low level emitted by the remote controller and after the delay action time t, e is a natural constant;

In the present embodiment, t=2ms, u _C2 (t)=0.7V, the capacitance value of selecting electric capacity C2 is 1uF;

Step 305, according to the formula Select the capacitance of the capacitor C3, where u _C3 (t) is the voltage on the capacitor C3 after the power supply is powered on and the delay action time t has elapsed;

In this embodiment, u _C3 (t)=4V, and the capacitance value of the selected capacitor C3 is 0.1uF;

Step 4. Connect activation start button S3, transistor Q8, resistor R10, resistor R11, resistor R12, resistor R13 and resistor R14, and capacitor C2 and capacitor C3 to form activation operation circuit 1. The specific process is as follows:

Step 401, leading out one end of the resistor R11 as the remote control signal input terminal HK of the activation operation circuit 1, and connecting the other end of the resistor R11 to the base of the transistor Q8;

Step 402, connecting the resistor R12 and the capacitor C2 in parallel between the base and the emitter of the transistor Q8;

Step 403, connecting one end of the resistor R13 and the resistor R10 in series to the collector of the transistor Q8, and the other end to the output terminal Vo of the DC-DC converter 6;

Step 404, connect one end of the parallel connection of the resistor R14 and the capacitor C3 to the series node of the resistor R13 and the resistor R10, and connect the other end to the ground;

Step 405, leading out the series node of the resistor R13 and the resistor R10 as the output end of the activation operation circuit 1;

Step 406, connecting the activation start button S3 between the collector and the emitter of the triode Q8;

Step 407, connect the emitter of the transistor Q8 to the output terminal Vo of the DC-DC converter 6;

Step 5, select the resistance R3, the resistance R5 and the resistance R6 of the suitable parameters that form the activation signal detection circuit 2, and its specific process is:

According to the formula Select the resistance values of resistor R3, resistor R5 and resistor R6, wherein, V ₊₁ is the non-inverting value of comparator U1 when the battery activation is not started (the activation start button S3 is not pressed, and the remote control signal input terminal of the activation operation circuit 1 is suspended). The voltage at the input terminal, at this time, the output terminal of the comparator U1 outputs a high level; V _1H is the high level voltage output by the output terminal of the comparator U1 and is equal to the power supply voltage of the comparator U1; V ₊₂ is the activation start of the battery (press the activation start button S3 or the remote control signal input terminal HK of the activation operation circuit 1 receives the low level transmitted by the remote controller) the voltage of the non-inverting input terminal of the comparator U1, at this time, the output terminal of the comparator U1 outputs a low voltage flat;

In this embodiment, V ₊₁ =6.8V, V _1H =V _ref =12V, V ₊₂ =3.4V, according to the formula Select the resistance value of resistor R3 as 24kΩ, select the resistance value of resistor R5 as 36kΩ, and select the resistance value of resistor R6 as 36kΩ;

Step 6. Connect the comparator U1, resistor R3, resistor R5 and resistor R6 to form the activation signal detection circuit 2. The specific process is as follows:

Step 601, connect one end of the resistor R3 and one end of the resistor R5 to the non-inverting input terminal of the comparator U1, ground the other end of the resistor R3, and lead out the other end of the resistor R5 as the reference voltage input terminal of the activation signal detection circuit 2 ;

Step 602, lead out the inverting input terminal of the comparator U1 as the comparison voltage input terminal of the activation signal detection circuit 2;

Step 603, connecting the resistor R6 between the output terminal of the comparator U1 and the non-inverting input terminal;

Step 604, lead out the output end of the comparator U1 as the output end of the activation signal detection circuit 2;

Step 7, select the resistance R2 and the resistance R4 of the suitable parameters that form the activation signal isolation circuit 3, and its specific process is as follows:

Step 701, according to the formula Select the resistance value of resistor R2, where, Be the current output by the output end of the activation signal detection circuit 2, that is, the current flowing into the cathode of the optocoupler isolation chip U2, V _be ' is the emitter junction voltage of the triode Q2 and takes a value of 0.7V;

In this example, Select the resistance value of resistor R2 as 2kΩ;

Step 702, according to the formula Select the resistance value of resistor R4, where, is the input forward voltage drop of optocoupler isolation chip U2, It is the forward current of optocoupler isolation chip U2.

In this example, The resistance value of resistor R4 is selected as 6.2kΩ.

Step 8. Connect the optocoupler isolation chip U2, transistor Q2, resistor R2 and resistor R4 to form the activation signal isolation circuit 3. The specific process is as follows:

Step 801, connect one end of the resistor R4 to the anode of the optocoupler isolation chip U2, and the other end leads out to serve as the reference voltage input end of the activation signal isolation circuit 3;

Step 802, lead out the cathode of the optocoupler isolation chip U2 as the comparison voltage input terminal of the activation signal isolation circuit 3;

Step 803, connect the base of the triode Q2 to the collector of the optocoupler isolation chip U2, and ground the emitter of the optocoupler isolation chip U2 and the collector of the triode Q2;

Step 804, connecting the resistor R2 between the base and the emitter of the triode Q2;

Step 805, lead out the emitter of the triode Q2 as the output terminal of the activation signal isolation circuit 3;

Step 9, connect the battery activation control circuit, the specific process is:

Step 901, connect the reference voltage input terminal of the activation signal detection circuit 2 to the reference voltage output terminal of the reference voltage circuit 4, and connect the comparison voltage input terminal of the activation signal detection circuit 2 to the output terminal of the activation operation circuit 1;

Step 902, connect the output end of the activation signal detection circuit 2 to the comparison voltage input end of the battery management circuit 7;

Step 903, connect the reference voltage input terminal of the activation signal isolation circuit 3 to the reference voltage output terminal of the reference voltage circuit 4, and connect the comparison voltage input terminal of the activation signal isolation circuit 3 to the output terminal of the activation signal detection circuit 2;

Step 904 , connect the output terminal of the activation signal isolation circuit 3 to the compensation terminal of the PWM control driving circuit 5 .

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.

Claims (5)

1. A battery activation control circuit of an uninterruptible direct current power supply, said uninterruptible direct current power supply comprising a battery management circuit (7), a PWM control drive circuit (5) and a DC-DC connected with the PWM control drive circuit (5) A converter (6), and a storage battery (8) whose positive pole is connected to the output end of the DC-DC converter (6) and whose negative pole is connected to the battery management circuit (7), wherein the battery activation control circuit includes The activation operation circuit (1), the activation signal detection circuit (2) and the activation signal isolation circuit (3) connected in sequence, and the activation signal detection circuit (2), the activation signal isolation circuit (3) and the battery management circuit ( 7) A reference voltage circuit (4) that provides a reference voltage, the compensation end of the PWM control drive circuit (5) is connected to the output end of the activation signal isolation circuit (3), and the comparison voltage of the battery management circuit (7) The input end is connected with the output end of the activation signal detection circuit (2); The activation operation circuit (1) includes an activation start button S3, a transistor Q8 and a resistor R11, one end of the resistor R11 is the remote control signal input terminal of the activation operation circuit (1), and the base of the transistor Q8 is connected to the resistor R11. The other ends are connected, the base and the emitter of the triode Q8 are connected in parallel with a resistor R12 and a capacitor C2, and the collector of the triode Q8 is connected to the DC-DC converter (6) through the series connected resistor R13 and resistor R10 The output terminal Vo of the resistor R13 and the resistor R10 is grounded through the parallel resistor R14 and the capacitor C3, and the serial node of the resistor R13 and the resistor R10 is the output terminal of the activation operation circuit (1), and the The activation start button S3 is connected between the collector and the emitter of the triode Q8, and the emitter of the triode Q8 is connected to the output terminal Vo of the DC-DC converter (6); The activation signal detection circuit (2) includes a comparator U1, the non-inverting input terminal of the comparator U1 is connected to the reference voltage output terminal of the reference voltage circuit (4) through a resistor R5, and is grounded through a resistor R3, and the comparator U1 The inverting input terminal of the comparator U1 is connected to the output terminal of the activation operation circuit (1), a resistor R6 is connected between the output terminal of the comparator U1 and the non-inverting input terminal, and the output terminal of the comparator U1 is the activation signal detection circuit (2) the output terminal; The activation signal isolation circuit (3) includes an optocoupler isolation chip U2 and a triode Q2, the anode of the optocoupler isolation chip U2 is connected to the reference voltage output terminal of the reference voltage circuit (4) through a resistor R4, and the optocoupler isolation chip The cathode of U2 is connected to the output end of the activation signal detection circuit (2), the collector of the optocoupler isolation chip U2 is connected to the base of the triode Q2, and the emitter of the optocoupler isolation chip U2 and the collector of the triode Q2 are both grounded A resistor R2 is connected between the base and the emitter of the triode Q2, and the emitter of the triode Q2 is the output end of the activation signal isolation circuit (3). 2. The battery activation control circuit according to claim 1, characterized in that: the reference voltage circuit (4) is composed of an integrated three-terminal voltage regulator chip TL431, a resistor R16, a resistor R17 and a resistor R18, One end of the resistor R16, the resistor R17 and the resistor R18 connected in series are connected to the output terminal Vo of the DC-DC converter (6), and the other end is grounded; The cathodes of TL431 are connected, and the cathode of the integrated three-terminal voltage stabilizing chip TL431 is the reference voltage output terminal of the reference voltage circuit (4). The anode of the integrated three-terminal voltage regulator chip TL431 is grounded. 3. The battery activation control circuit according to claim 1, characterized in that: the PWM control drive circuit (5) includes a controller chip UC3845 and a resistor R1, the first of the controller chip UC3845 The pin is the compensation end of the PWM control drive circuit (5), one end of the resistor R1 is connected to the sixth pin of the controller chip UC3845, and the other end of the resistor R1 is the output of the PWM control drive circuit (5) end. 4. The battery activation control circuit of an uninterruptible direct current power supply according to claim 1, characterized in that: the DC-DC converter (6) comprises a transformer T1, a MOSFET switch Q3 and a diode D1, and the MOSFET switch The gate of Q3 is the control signal input terminal of the DC-DC converter (6), the source of the MOSFET switching tube Q3 is grounded, and one end of the primary coil of the transformer T1 is the power input of the DC-DC converter (6). end and connected with the output end of the external power supply, the other end of the primary coil of the transformer T1 is connected with the drain of the MOSFET switch tube Q3, one end of the secondary coil of the transformer T1 is connected with the anode of the diode D1, The cathode of the diode D1 is the output terminal Vo of the DC-DC converter (6), and is grounded through the capacitor C1, and the other end of the secondary coil of the transformer T1 is grounded. 5. The battery activation control circuit of an uninterruptible direct current power supply according to claim 1, characterized in that: the battery management circuit (7) includes a MOSFET switch tube Q4 and an optocoupler isolation chip U5, and the optocoupler isolation chip U5 The anode is connected to the reference voltage output terminal of the reference voltage circuit (4) through the resistor R20, and the cathode of the optocoupler isolation chip U5 is the comparison voltage input terminal of the battery management circuit (7) and is connected to the output terminal of the activation signal detection circuit (2) , the collector of the optocoupler isolation chip U5 is connected to the output terminal Vo of the DC-DC converter (6) through a resistor R19, and the grid of the MOSFET switching tube Q4 is connected to the emitter of the optocoupler isolation chip U5, so The drain of the MOSFET switch Q4 is grounded, the negative pole of the storage battery (8) is connected to the source of the MOSFET switch Q4, and a resistor R21 is connected between the source and the gate of the MOSFET switch Q4.