CN204272443U - Bi-directional buck-boost solar LED street light controller - Google Patents

Abstract

The utility model relates to a kind of two-way falling-rising pressure solar LED street lamp controller, comprise photovoltaic panel, LED, storage battery, Bidirectional up-down volt circuit, field effect transistor drive circuit, PIC single chip microcomputer, it is characterized in that: photovoltaic panel, LED connect into loop by Bidirectional up-down volt circuit and storage battery; The input AD sampling end of PIC single chip microcomputer connects the output of photovoltaic panel, the output AD sampling end of PIC single chip microcomputer connects the output of LED, the PWM of PIC single chip microcomputer holds connection control field effect transistor drive circuit, and field effect transistor drive circuit drives each field effect transistor in Bidirectional up-down volt circuit.The utility model main feature is that maximum power charging circuit and constant current driver circuit for LED share a loop of power circuit, solar recharging and LED constant current is utilized to drive working hour differently to carry out different control strategies, realize maximal power tracing (MPPT) charging and LED constant current driving function, in the same circuit, realize the two-way flow of energy.

Description

Bi-directional buck-boost solar LED street light controller

technical field

The utility model relates to a solar LED street lamp controller, which is particularly suitable for the solar street lamp controller which is used for charging a storage battery by stepping down the voltage of a photovoltaic panel and supplying LED lamps with a constant current of boosting the voltage of the storage battery.

Background technique

The solar street light controller with LED drive is a key part of the independent solar LED street light system. Its function is to conduct maximum power tracking (MPPT) on the photovoltaic panel power to charge the battery and drive the LED light source with constant current from the battery power.

Existing solar street light controllers with LED drive generally include two circuits: the first circuit is a maximum power tracking (MPPT) charging circuit, generally using a BUCK step-down structure or a BOOST boost structure; the second circuit is a constant current discharge circuit, Generally, a BUCK step-down structure or a BOOST step-up structure is used.

The above-mentioned street lamp with constant current drive uses more components to realize the street lamp control function, and the circuit needs to be further simplified.

Contents of the invention

The purpose of this utility model is to provide a two-way step-down and boost solar LED street lamp controller. The utility model is different from the traditional solar street lamp controller with LED drive in that: the maximum power charging circuit and the LED constant current drive circuit share a power circuit. Different control strategies are used for solar charging and LED constant current driving during different working hours to realize maximum power tracking (MPPT) charging and LED constant current driving functions, and realize bidirectional flow of energy in the same loop.

The bidirectional buck-boost solar LED street lamp controller includes photovoltaic panels, LED lamps, batteries, bidirectional buck-boost circuits, field effect tube drive circuits, and PIC single-chip microcomputers. The storage battery is connected into a loop; the input AD sampling terminal of the PIC microcontroller is connected to the output terminal of the photovoltaic panel, the output AD sampling terminal of the PIC microcontroller is connected to the output terminal of the LED light, and the PWM terminal of the PIC microcontroller is connected to control the field effect tube drive circuit, and the field effect tube drive The circuit drives each field effect transistor in the bidirectional buck-boost circuit;

The bidirectional buck-boost circuit consists of a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a first capacitor C1, a second capacitor C2, an inductor L1, a first diode D1, Composed of the second diode D2 and the third diode D3, the anode of the first diode D1 is connected to the anode of the photovoltaic panel, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the first capacitor C1 , the anode of the LED lamp, and the source of the second field effect transistor Q2 are connected, and the drain of the second field effect transistor Q2 is connected to the anode of the second diode D2, the cathode of the third diode D3, and the drain of the third field effect transistor Q3 respectively. The source is connected to one end of the inductance L1, the other end of the inductance L1 is respectively connected to the positive pole of the second capacitor C2 and the positive pole of the battery, and the negative pole of the photovoltaic panel is respectively connected to the negative pole of the first capacitor C1, the negative pole of the second capacitor C2, the negative pole of the battery, and the first field The drain of the effect transistor Q1, the drain of the third field effect transistor Q3, and the anode of the third diode D3 are connected, and the cathode of the LED lamp is connected with the source of the first field effect transistor Q1.

The PIC microcontroller includes a PWM generating circuit and an AD sampling circuit, the main function of the PWM generating circuit is to provide signals to the field effect tube drive circuit, and the AD sampling circuit mainly samples the voltage and current data in the input and output loops of the bidirectional buck-boost circuit . Both the PWM generating circuit and the AD sampling circuit are existing circuits.

The field effect tube drive circuit is driven by high-frequency transformer isolation, which drives and discharges the PWM signal generated by the PIC microcontroller to supply power to the field effect tube in the bidirectional buck-boost circuit.

The main function of the bidirectional buck-boost circuit is to lower the voltage of the photovoltaic panel to charge the battery, and to boost the battery to supply the LED lamp with a constant current.

When the photovoltaic panel is charging the battery, the first field effect transistor Q1 and the third field effect transistor Q3 are turned off, and the PIC microcontroller provides a PWM driving signal to the second field effect transistor Q2, and the bidirectional buck-boost circuit is equivalent to a BUCK step-down circuit. In order to realize the step-down MPPT maximum power tracking charging function. When the battery is discharged, the first FET Q1 is turned on, and the second FET Q2 is turned off. The PIC microcontroller provides a PWM driving signal to the third FET Q3. The discharge circuit is equivalent to a BOOST booster circuit to realize LED lighting. Boost constant current drive function.

The utility model adopts a bidirectional buck-boost circuit to realize the maximum power charging circuit and the LED constant current drive circuit share a power loop, and uses different control strategies for solar charging and LED constant current drive to realize maximum power tracking (MPPT) charging. With the LED constant current drive function, the two-way flow of energy can be realized in the same circuit, the circuit structure is greatly simplified, the number of components is reduced, and the cost of the controller is reduced.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The utility model will be further described in conjunction with the accompanying drawings.

As shown in Figure 1, the bidirectional buck-boost solar LED street lamp controller includes photovoltaic panels, LED lights, batteries, bidirectional buck-boost circuits, field effect tube drive circuits, and PIC microcontrollers. It is characterized in that: photovoltaic panels and LED lights pass through The bidirectional buck-boost circuit is connected with the battery to form a loop; the input AD sampling terminal of the PIC microcontroller is connected to the output terminal of the photovoltaic panel, the output AD sampling terminal of the PIC microcontroller is connected to the output terminal of the LED lamp, and the PWM terminal of the PIC microcontroller is connected to control the drive of the field effect tube The circuit, the field effect tube drive circuit drives each field effect tube in the bidirectional buck-boost circuit.

The bidirectional buck-boost circuit consists of a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a first capacitor C1, a second capacitor C2, an inductor L1, a first diode D1, Composed of the second diode D2 and the third diode D3, the anode of the first diode D1 is connected to the anode of the photovoltaic panel, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the first capacitor C1 , the anode of the LED lamp, and the source of the second field effect transistor Q2 are connected, and the drain of the second field effect transistor Q2 is connected to the anode of the second diode D2, the cathode of the third diode D3, and the drain of the third field effect transistor Q3 respectively. The source is connected to one end of the inductance L1, and the other end of the inductance L1 is respectively connected to the positive pole of the second capacitor C2 and the positive pole of the battery. The negative pole of the photovoltaic panel is respectively connected to the negative pole of the first capacitor C1, the negative pole of the second capacitor C2, the negative pole of the battery, and the first field The drain of the effect transistor Q1, the drain of the third field effect transistor Q3, and the anode of the third diode D3 are connected, and the cathode of the LED lamp is connected with the source of the first field effect transistor Q1. the

The PIC microcontroller includes a PWM generating circuit and an AD sampling circuit, the main function of the PWM generating circuit is to provide signals to the field effect tube drive circuit, and the AD sampling circuit mainly samples the voltage and current data in the input and output loops of the bidirectional buck-boost circuit . Both the PWM generating circuit and the AD sampling circuit are existing circuits.

The field effect tube drive circuit is driven by high-frequency transformer isolation, which drives and discharges the PWM signal generated by the PIC microcontroller to supply power to the field effect tube in the bidirectional buck-boost circuit.

The main function of the bidirectional buck-boost circuit is to lower the voltage of the photovoltaic panel to charge the battery, and to boost the battery to supply the LED lamp with a constant current.

When the photovoltaic panel is charging the battery, the first field effect transistor Q1 and the third field effect transistor Q3 are turned off, and the PIC microcontroller provides a PWM driving signal to the second field effect transistor Q2, and the bidirectional buck-boost circuit is equivalent to a BUCK step-down circuit. In order to realize the step-down MPPT maximum power tracking charging function. When the battery is discharged, the first field effect transistor Q1 is turned on, and the second field effect transistor Q2 is turned off. The PIC microcontroller provides a PWM driving signal to Q3. The discharge circuit is equivalent to a BOOST boost circuit to realize the constant current drive of the LED lamp. Function.

The field effect tube drive circuit is driven by high-frequency transformer isolation, which drives and discharges the PWM signal generated by the PIC microcontroller to supply power to the field effect tube in the bidirectional buck-boost circuit.

The utility model adopts a bidirectional buck-boost circuit to realize the maximum power charging circuit and the LED constant current drive circuit share a power loop, and uses different control strategies for solar charging and LED constant current drive to realize maximum power tracking (MPPT) charging. With the LED constant current drive function, the two-way flow of energy can be realized in the same circuit, the circuit structure is greatly simplified, the number of components is reduced, and the cost of the controller is reduced.

Claims (1)

1. Bidirectional buck-boost solar LED street light controller, including photovoltaic panels, LED lights, batteries, bidirectional buck-boost circuits, field effect tube drive circuits, and PIC single-chip microcomputers, characterized in that: photovoltaic panels and LED lights pass bidirectional buck-boost The circuit is connected to the battery to form a loop; the input AD sampling terminal of the PIC microcontroller is connected to the output terminal of the photovoltaic panel, the output AD sampling terminal of the PIC microcontroller is connected to the output terminal of the LED lamp, and the PWM terminal of the PIC microcontroller is connected to control the field effect tube drive circuit, field effect The tube drive circuit drives each field effect tube in the bidirectional buck-boost circuit; The bidirectional buck-boost circuit consists of a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a first capacitor C1, a second capacitor C2, an inductor L1, a first diode D1, Composed of the second diode D2 and the third diode D3, the anode of the first diode D1 is connected to the anode of the photovoltaic panel, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the first capacitor C1 , the anode of the LED lamp, and the source of the second field effect transistor Q2 are connected, and the drain of the second field effect transistor Q2 is connected to the anode of the second diode D2, the cathode of the third diode D3, and the drain of the third field effect transistor Q3 respectively. The source is connected to one end of the inductance L1, and the other end of the inductance L1 is respectively connected to the positive pole of the second capacitor C2 and the positive pole of the battery. The negative pole of the photovoltaic panel is respectively connected to the negative pole of the first capacitor C1, the negative pole of the second capacitor C2, the negative pole of the battery, and the first field The drain of the effect transistor Q1, the drain of the third field effect transistor Q3, and the anode of the third diode D3 are connected, and the cathode of the LED lamp is connected with the source of the first field effect transistor Q1.