CN205335889U - Adjustable power charge -discharge ware based on TL494 - Google Patents

Abstract

The utility model relates to a charge-discharger with adjustable power based on TL494, which includes a TL494 main control circuit, an energy storage power supply, an auxiliary power supply and a measurement and control module, wherein the TL494 main control circuit includes a step-down BUCK circuit charging module and a boost-type BOOST Circuit discharge module. The energy storage power supply is a lithium battery, which converts the mains power into direct current through the step-down BUCK circuit charging module to charge it, and the energy storage power supplies power to the consumer through the step-up BOOST circuit discharge module. The measurement and control module displays the data in real time through the LCD through the real-time detection of the TL494 main control circuit, and the measurement and control module receives the key signal to control the PWM duty cycle of the TL494 main control circuit to obtain different output voltages. Among them, the auxiliary power supply supplies power to the TL494 main control circuit and the measurement and control module, which ensures the stable operation of the circuit.

Description

An Adjustable Power Charger-Discharger Based on TL494

technical field

The utility model belongs to the field of power supplies, in particular to the field of a power charging and discharging device.

Background technique

With the development of life, portable power sources are used more and more widely in people's lives, such as small charging treasures and large electric vehicles. However, for different devices, we need to match different batteries to charge them, which greatly increases The types of our batteries have great limitations, high costs, and seem particularly cumbersome. When we need to charge the battery with clean energy such as solar energy, we cannot control the charging power, so we cannot match the current and voltage of each battery, and the application is limited.

The power module of the same kind can only charge and discharge a single battery, which has great limitations. The chargers for larger power appliances are bulky and not easy to carry, and the loss in the middle is large, which is not conducive to energy saving and emission reduction. Bao's items are not universal, and the output power cannot be adjusted, so that the electrical appliances can only use a specific voltage. Therefore, we urgently need a charging and discharging device that can be carried by itself, has adjustable power, and uses less space.

Utility model content

The purpose of this utility model is to provide a charge-discharger with adjustable power based on TL494. The charge-discharger can adjust the input and output voltages, which is more convenient for practical application.

In order to achieve the above object, the utility model adopts the following technical solutions:

A charge-discharger with adjustable power based on TL494, including a main control circuit, a measurement and control module and an auxiliary power supply, characterized in that the main control circuit includes a BUCK circuit charging module and a BOOST circuit discharging module, wherein the BUCK circuit charging module and the BOOST circuit charging module The BOOST circuit discharge module is driven by a drive circuit including a TL494 drive chip;

The measurement and control module includes a current detection circuit, a voltage detection circuit, and a button module. The current detection circuit and the voltage detection circuit detect the current and voltage when the charging module and the discharge module are input and output, and the button module transmits signals to the charging module through buttons And in the discharge module, the button module can control the output power.

Further, the charging and discharging device also includes an auxiliary power module, which supplies power to the measurement and control module.

Further, the charging module of the BUCK circuit is sequentially connected to a rectifier circuit, a BUCK circuit and a filter circuit.

Further, the BOOST circuit discharge module is sequentially connected to a BOOST circuit, an inverter circuit and a filter circuit.

Further, the measurement and control module uses a STC12C5A16S2 single-chip microcomputer.

Furthermore, the charging and discharging device also includes an LCD display module, and the auxiliary power supply supplies power to the LCD display module.

As can be seen from the above technical solutions, the beneficial effects of the utility model are:

(1) The utility model uses a TL494 main control circuit, which is a dual-quadrant operation of a power-type DC converter, and can realize two-way transmission of energy.

(2) The measurement and control module of the utility model includes buttons that can adjust the output voltage of the circuit, can switch between the charging mode and the discharging mode, and can also control the BUCK circuit and BOOST circuit with TL494 as the core. The constant current charging of the energy source and the constant voltage discharge with the load can charge more types of energy storage power sources and supply power to more types of electrical appliances respectively.

(3) In the utility model, the step-down BUCK circuit outputs DC for charging the energy storage power supply, and the step-up BOOST circuit outputs DC for discharge. The current and voltage input terminals are collected and compared through voltage sensors and current sensors, and then feedback control is performed through a single-chip microcomputer. This can be displayed on the LCD, and can be controlled by buttons, so as to better realize human-computer interaction.

(4) In the utility model, different AC voltages can be generated through the discharge module, so that electrical appliances in many countries with different mains voltages can be used.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the circuit diagram of the BUCK circuit charging module in the utility model;

Fig. 3 is the circuit diagram that produces PWM signal in the utility model;

Fig. 4 is a circuit diagram of the BOOST circuit discharge module of the present invention.

detailed description

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

As shown in Figure 1, a TL494-based adjustable power charger and discharger includes a main control circuit, a measurement and control module, an auxiliary power supply, and an LCD display module. The measurement and control module includes a current detection circuit, a voltage detection circuit, and a key module. The control chip of the measurement and control module is STC12C5A16S2 single-chip microcomputer. The LCD display module displays the current charging voltage and current, as well as the real-time storage capacity of the energy storage power supply. During the working process of the charger, the mains power passes through the step-down BUCK circuit charging module in the TL494 main control circuit, and is controlled by the measurement and control module so that the mains power is used as a constant current source to charge the energy storage power supply. When the power in the power supply is low, the energy storage power supply passes through the step-up BOOST circuit discharge module of the TL494 main control circuit, and is controlled by the measurement and control module so that the energy storage power supply acts as a constant voltage source and discharges to the consumer at a constant voltage. Among them, the measurement and control module uses voltage and current sensors to collect and compare the output voltage and current of the BUCK circuit, and can adjust the charging current with high precision through buttons. When fully charged, there are two ways to protect the power supply. One way is to switch to the discharge mode, and the other way is to automatically disconnect the charging circuit after fully charged. This is mainly controlled by the program of the single-chip microcomputer STC12C5A16S2. Among them, the auxiliary power supplies power to the measurement and control module and the LCD display module separately, which can provide a layer of guarantee for the stability of the system.

As shown in Figure 2, it is the circuit diagram of the BUCK circuit charging module. The mains power passes through the rectifier circuit to convert AC power into DC power, and then passes through the BUCK circuit, where the control terminal of the MOS tube of the BUCK circuit inputs the PWM signal, and is filtered by R1 and C2. Charge the battery. Among them, the PWM signal can be adjusted.

As shown in Figure 3, it is a drive circuit for generating PWM signals. The chip of the drive circuit is TL494, in which pins E1 and E2 generate PWM signals, and 1IN+ is connected to the single-chip microcomputer STC12C5A16S2. Detect the current current and voltage, and display it on the LCD display module in real time through the control of the single-chip microcomputer. The button module connected to the MCU can set different values and input them into the MCU. The MCU adjusts the duty cycle by controlling the TL494 to obtain different PWMs, so that it can output different DC voltages and charge energy storage power supplies with different voltages. .

As shown in Figure 4, P1 is the output terminal of the energy storage power supply. After being filtered by capacitors C2 and C9, the voltage is boosted by the BOOST circuit. The control terminal of the MOS tube in the BOOST circuit inputs a PWM signal, and the boosted DC power is still It cannot be directly supplied to daily electrical appliances. It needs to be filtered by Q1, Q2, Q3, and Q4 before it can be connected to electrical appliances. The control terminal of the MOS tube in the BOOST circuit inputs PWM signals. The drive circuit in the circuit is the same, where E1 and E2 pins generate PWM signals, 1IN+ is connected to the single-chip microcomputer STC12C5A16S2, and the current current and voltage are respectively detected through the current detection circuit and voltage detection circuit in the measurement and control module, and through the control of the single-chip microcomputer, real-time display on the LCD displayed on the display module. The button module connected with the MCU can be set to input different values into the MCU, and the MCU adjusts the duty ratio by controlling the TL494 to obtain different PWMs, so that different DC voltages can be output, and finally, different voltages can be obtained after inverter. Alternating current, which can be applied to electrical appliances in different countries.

The above-mentioned embodiment is only to describe the preferred implementation of the utility model, not to limit the scope of the utility model. Various modifications and improvements made should fall within the scope of protection determined by the claims of the utility model.

Claims (6)

1. the regulating power charge and discharge electrical equipment based on TL494, including governor circuit, control module and accessory power supply, it is characterized in that, described governor circuit includes BUCK circuit charging module and BOOST circuit discharging module, and wherein BUCK circuit charging module and BOOST circuit discharging module are driven by the drive circuit including TL494 driving chip；

Described control module includes current detection circuit, voltage detecting circuit, key-press module, with electric current when exporting and voltage when current detection circuit and voltage detecting circuit detection charging module and discharge module input, key-press module is transferred signals to by button in charging module and discharge module, and key-press module can control output size。

2. a kind of regulating power charge and discharge electrical equipment based on TL494 according to claim 1, it is characterised in that also including auxiliary power module, auxiliary power module is powered to control module。

3. a kind of regulating power charge and discharge electrical equipment based on TL494 according to claim 1, it is characterised in that described BUCK circuit charging module is that rectification circuit, BUCK circuit and filter circuit are sequentially connected with。

4. a kind of regulating power charge and discharge electrical equipment based on TL494 according to claim 1, it is characterised in that described BOOST circuit discharging module is that BOOST circuit, inverter circuit and filter circuit are sequentially connected with。

5. a kind of regulating power charge and discharge electrical equipment based on TL494 according to claim 1, it is characterised in that described control module uses STC12C5A16S2 single-chip microcomputer。

6. a kind of regulating power charge and discharge electrical equipment based on TL494 according to claim 1, it is characterised in that described charge and discharge electrical equipment also includes LCD display module, and accessory power supply is powered to LCD display module。