Circuit applied to street lamp

Abstract

The utility model discloses a circuit applied to a street lamp, which belongs to the technical field of lighting equipment and comprises a power factor correction module for outputting bus voltage; the input end of the first DC-DC conversion module is connected with the bus voltage in parallel, and the output end is connected with the battery in parallel; the input end of the second DC-DC conversion module is connected in parallel with the bus voltage, and the output end is connected in parallel with the street lamp; in valley electricity, the bus voltage is generated through the power factor correction module, and the bus voltage charges the battery through the first DC-DC conversion module; and during peak electricity, the battery discharges through the first direct current-direct current conversion module to maintain the bus voltage, and the bus voltage supplies power to the street lamp through the second direct current-direct current conversion module. According to the circuit applied to the street lamp, the structure is simplified, the reliability of the circuit structure is improved, the overall service life of the street lamp is prolonged, and the solar cell panel can be utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting equipment, in particular to a circuit applied to a street lamp. Background Art

[0002] Usually, street lights are installed on roads in urban areas so that people can pass safely at night. Ordinary solar street lights use solar panels to charge batteries during the day, and the batteries discharge to light up the street lights at night. However, single-function solar street lights are often affected by weather, resulting in a low lighting rate. In addition, the batteries used in solar street lights are multi-cell batteries connected in series, generally with a battery protection board. Failure of the protection board can easily cause the battery to catch fire.

[0003] Therefore, a new circuit structure for street lamps with batteries is urgently needed, in which the battery is charged by the mains and solar energy to ensure the lighting rate. In addition, the protection board can be removed to avoid damage to the battery due to protection board failure, fully ensuring the safety of the battery. At the same time, the battery energy storage principle is used. The mains charges the battery during valley hours; the battery is discharged during peak hours, and the mains does not participate in the power supply, thereby balancing the load of the power grid. Utility Model Content

[0004] In order to achieve the above-mentioned purpose, the utility model provides a circuit applied to a street lamp, which adopts the following technical solution:

[0005] A circuit applied to a street lamp, comprising:

[0006] A power factor correction module, which outputs a bus voltage;

[0007] A first DC-DC conversion module, whose input end is connected in parallel with the output end of the power factor correction module, and whose output end is connected in parallel with a battery;

[0008] The second DC-DC conversion module has an input end connected in parallel with the output end of the power factor correction module, and an output end connected in parallel with the street lamp.

[0009] Implementations may include any or all of the following features.

[0010] Furthermore, during valley power, the bus voltage is generated through the power factor correction module, and the bus voltage charges the battery via the first DC-DC conversion module, or the bus voltage charges the battery via the first DC-DC conversion module and simultaneously supplies power to the street lamp via the second DC-DC conversion module, or the bus voltage supplies power to the street lamp via the second DC-DC conversion module; during peak power, the battery discharges via the first DC-DC conversion module to maintain the bus voltage, and the bus voltage supplies power to the street lamp via the second DC-DC conversion module.

[0011] Furthermore, it also includes a rectifier module, the input end of the rectifier module is connected to the alternating current, and the input end of the power factor correction module is connected in parallel with the output end of the rectifier module.

[0012] Further, the rectifier module includes a first diode, a second diode, a third diode and a fourth diode, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the cathode of the fourth diode, the anode of the fourth diode is connected to the anode of the third diode, the cathode of the third diode is connected to the anode of the first diode, the first end of the alternating current is connected to the anode of the first diode, the second end of the alternating current is connected to the anode of the second diode, and the input end of the power factor correction module is connected in parallel with the cathode of the second diode and the anode of the third diode.

[0013] Furthermore, the power factor correction module includes a first capacitor, one end of which is connected to the cathode of the second diode, and the other end of which is connected to the anode of the third diode.

[0014] a first transformer, a first end of a primary winding of which is connected to the cathode of the second diode, and a second end of a secondary winding of which is connected to a secondary ground terminal,

[0015] a first switch tube, a first end of which is connected to the second end of the primary winding of the first transformer,

[0016] A first resistor, one end of which is connected to the second end of the first switch tube, and the other end of which is connected to the primary ground terminal.

[0017] a second switch tube, a second end of which is connected to a first end of a secondary winding of the first transformer,

[0018] A second capacitor, a first end of which is connected to the first end of the second switch tube, a second end of which is connected to the second end of the secondary winding of the first transformer, and two ends of the second capacitor are connected to the input end of the first DC-DC conversion module.

[0019] Furthermore, the first DC-DC conversion module includes a third capacitor connected in parallel with the second capacitor.

[0020] A third switch tube, a first end of which is connected to the first end of the third capacitor,

[0021] a fourth switch tube, a first end of which is connected to the second end of the third switch tube, and a second end of which is connected to the second end of the third capacitor and the negative electrode of the battery,

[0022] a first inductor, a first end of which is connected to the first end of the fourth switch tube, and a second end of which is connected to the positive electrode of the battery,

[0023] A fourth capacitor has a first end connected to the second end of the first inductor, and a second end connected to the second end of the fourth switch tube.

[0024] Furthermore, the second DC-DC conversion module includes a fifth capacitor, a first end of which is connected to the first end of the second switch tube, and a second end of which is connected to the secondary ground terminal.

[0025] a second inductor, a first end of which is connected to the first end of the fifth capacitor,

[0026] a fifth switch tube, a first end of which is connected to the second end of the second inductor, and a second end of which is connected to the second end of the fifth capacitor,

[0027] a fifth diode, an anode of which is connected to the first end of the fifth switch tube, and a cathode of which is connected to the first end of the street lamp,

[0028] a sixth capacitor, a first end of which is connected to the cathode of the fifth diode, and a second end of which is connected to the second end of the fifth switch tube,

[0029] A second resistor has one end connected to the second end of the sixth capacitor and the other end connected to the second end of the street lamp.

[0030] Furthermore, it also includes a digital controller, which outputs a control signal for controlling the first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube.

[0031] Furthermore, it also includes a solar panel, which is connected to the input end of the first DC-DC conversion module to charge the battery or power the street lamp.

[0032] Furthermore, it also includes a control switch to control the input end of the first DC-DC conversion module to connect to the output end of the solar cell panel or the power factor correction module.

[0033] Furthermore, when the input end of the first DC-DC conversion module is connected to the solar panel, the solar panel charges the battery via the first DC-DC conversion module.

[0034] Furthermore, the digital controller outputs a control signal to control the control switch.

[0035] Furthermore, the digital controller monitors the voltage across the street lamp.

[0036] In the above technical solution of the utility model, a single battery is connected through the second DC-DC conversion module to form a battery pack as a whole. The voltage presented to the outside is the bus voltage, which is equivalent to multiple batteries connected in series. Under the same power condition, the external current is reduced, which alleviates the high current and low voltage problem when a single battery is used in street lamps.

[0037] In summary, the circuit of the utility model applied to street lamps has a simplified structure and improves the reliability of the circuit structure, thereby extending the overall service life of the street lamps and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Shown is a structural block diagram of the utility model.

[0039] Figure 2 It is shown as the first specific embodiment of the utility model.

[0040] Figure 3 It is shown as the second specific embodiment of the present utility model.

[0041] Figure 4 It is shown as the third specific embodiment of the present utility model.

[0042] Figure 5 It is shown as the fourth specific embodiment of the present utility model.

[0043] Description of the accompanying drawings:

[0044] 11, 21, 31, 41, 51-rectifier module; 12, 22, 32, 42, 52-power factor correction module; 13, 23, 33, 43, 53-first DC-DC conversion module; 14, 24, 34, 44, 54-second DC-DC conversion module; 45, 55-control switch; 56-digital controller. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Figure 1 The utility model is a structural block diagram of a circuit applied to a street lamp, comprising a rectifier module 11, a power factor correction module 12, a first DC-DC conversion module 13 and a second DC-DC conversion module 14. The alternating current AC is rectified by the rectifier module 11 to obtain direct current. The input end of the power factor correction module 12 is connected in parallel with the output end of the rectifier module 11. The output end of the power factor correction module 12 outputs a bus voltage V busThe input end of the first DC-DC conversion module 13 is connected in parallel to the output end of the power factor correction module 12, the output end of the first DC-DC conversion module 13 is connected in parallel to the battery BT, the input end of the second DC-DC conversion module 14 is connected in parallel to the output end of the power factor correction module 12, and the output end of the second DC-DC conversion module 14 is connected in parallel to the street lamp LED.

[0047] Furthermore, the first DC-DC conversion module 13 is a bidirectional DC-DC converter.

[0048] Furthermore, during the off-peak period, the alternating current AC is converted into a direct current voltage by the rectifier module 11, and then passes through the power factor correction module 12 to generate the bus voltage V bus , the bus voltage V bus The battery BT is charged only via the first DC-DC conversion module 13, or the bus voltage V bus The battery BT is charged via the first DC-DC conversion module 13, and the street light LED is powered via the second DC-DC conversion module 14, or the bus voltage V bus The street lamp LED is powered only through the second DC-DC conversion module 14; during peak power, the battery BT is discharged through the first DC-DC conversion module 13 to maintain the bus voltage V bus , the bus voltage V bus The street lamp LED is powered via the second DC-DC conversion module 14, thereby achieving the function of saving electric energy.

[0049] Optionally, the second DC-DC conversion module 14 can be used to select whether to turn on the street light LED as required. For example, during off-peak hours, the alternating current AC is converted into a direct current voltage by the rectifier module 11, and then generated into a bus voltage V by the power factor correction module 12. bus The second DC-DC conversion module 14 supplies power to the street lamp

[0050] Figure 2 A specific embodiment of a circuit for street lamps of the utility model includes a rectifier module 21, a power factor correction module 22, a first DC-DC conversion module 23 and a second DC-DC conversion module 24. The alternating current AC is rectified by the rectifier module 21 to obtain direct current. The input end of the power factor correction module 22 is connected in parallel with the output end of the rectifier module 21. The output end of the power factor correction module 22 outputs a bus voltage V busThe input end of the first DC-DC conversion module 23 is connected in parallel to the output end of the power factor correction module 22, the output end of the first DC-DC conversion module 23 is connected in parallel to the battery BT, the input end of the second DC-DC conversion module 24 is connected in parallel to the output end of the power factor correction module 22, and the output end of the second DC-DC conversion module 24 is connected in parallel to the street lamp LED.

[0051] More specifically, the rectifier module 21 is a rectifier bridge, including a diode D1, a diode D2, a diode D3 and a diode D4, the cathode of the diode D1 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the anode of the diode D1, the first end of the alternating current AC is connected to the anode of the diode D1, the second end of the alternating current AC is connected to the anode of the diode D2, and the input end of the power factor correction module 22 is connected in parallel with the cathode of the diode D2 and the anode of the diode D3.

[0052] The power factor correction module 22 is a flyback conversion topology, but the utility model is not limited thereto, and other topologies with DC-DC conversion functions can be used, including capacitor C1, capacitor C2, switch tube Q1, switch tube Q2, resistor R1 and transformer T1, one end of the capacitor C1 is connected to the cathode of the diode D2, the other end of the capacitor C1 is connected to the anode of the diode D3, the first end of the primary winding of the transformer T1 is connected to the cathode of the diode D2, and the second end of the primary winding of the transformer T1 is connected to the The drain of the switching tube Q1, one end of the resistor R1 is connected to the source of the switching tube Q1, the other end of the resistor R1 is connected to the ground end PGND, the first end of the secondary winding of the transformer T1 is connected to the source of the switching tube Q2, the first end of the capacitor C2 is connected to the drain of the switching tube Q2, the second end of the capacitor C2 is connected to the second end of the secondary winding of the transformer T1, the second end of the secondary winding of the transformer T1 is connected to the ground end SGND, and the two ends of the capacitor C2 are connected to the input end of the first DC-DC conversion module 23.

[0053] Furthermore, the switch tube Q1 adopts constant on-time (COT) control.

[0054] Optionally, the capacitor C2 includes a plurality of capacitors connected in parallel.

[0055] Optionally, the switch tube Q1 and the switch tube Q2 are N-channel MOSFETs.

[0056] The first DC-DC conversion module 23 is a bidirectional BUCK-BOOST topology structure, but the present invention is not limited thereto. Other topologies with bidirectional DC-DC conversion functions can be used, including capacitor C3, capacitor C4, switch tube Q3, switch tube Q4 and inductor L1. The capacitor C3 is connected in parallel with the capacitor C2, the drain of the switch tube Q3 is connected to the first end of the capacitor C3, the source of the switch tube Q3 is connected to the drain of the switch tube Q4, the source of the switch tube Q4 is connected to the second end of the capacitor C3, the first end of the inductor L1 is connected to the drain of the switch tube Q4, the first end of the capacitor C4 is connected to the second end of the inductor L1, the second end of the capacitor C4 is connected to the source of the switch tube Q4, the positive electrode of the battery BT is connected to the second end of the inductor L1, and the negative electrode of the battery BT is connected to the source of the switch tube Q4.

[0057] Optionally, the switch tube Q3 and the switch tube Q4 are N-channel MOSFETs.

[0058] The second DC-DC conversion module 24 is a BOOST topology structure, but the present invention is not limited thereto. Other topologies with DC-DC conversion function can be used, including capacitor C5, capacitor C6, inductor L2, switch tube Q5, diode D5 and resistor R2. The first end of the capacitor C5 is connected to the drain of the switch tube Q2, the second end of the capacitor C5 is connected to the secondary ground terminal SGND, the first end of the inductor L2 is connected to the first end of the capacitor C5, the second end of the inductor L2 is connected to the drain of the switch tube Q5, the source of the switch tube Q5 is connected to the second end of the capacitor C5, the anode of the diode D5 is connected to the drain of the switch tube Q5, the first end of the capacitor C6 is connected to the cathode of the diode D5, the second end of the capacitor C6 is connected to the source of the switch tube Q5, one end of the resistor R2 is connected to the second end of the capacitor C6, the other end of the resistor R2 is connected to the cathode of the street lamp LED, and the anode of the street lamp LED is connected to the cathode of the diode D5.

[0059] Furthermore, the switch tube Q5 adopts constant current control.

[0060] Optionally, the switch tube Q5 is an N-channel MOSFET.

[0061] The utility model connects a single lithium battery, namely the battery BT, through the first DC-DC conversion module 23 to form a battery pack as a whole, and the value presented to the outside is the bus voltage V bus The voltage is equivalent to multiple batteries connected in series. Under the same power condition, the external current is reduced, which alleviates the high current and low voltage problem when a single battery is used in the street light LED.

[0062] Optionally, the bus voltage V bus is 12V.

[0063] Figure 3 Another specific embodiment of the present invention is Figure 2 The difference between the embodiment shown in the figure is that the embodiment more specifically includes a digital controller 36, and the digital controller 36 outputs a switch control signal P Q1 , P Q2 , P Q3 , P Q4 , P Q5 , the switch control signal P Q1 , P Q2 , P Q3 , P Q4 , P Q5 Control switches Q1 / Q2 / Q3 / Q4 / Q5 respectively.

[0064] Figure 4 This is a circuit diagram of another specific embodiment of a circuit for street lamps of the utility model. In this specific embodiment, a solar panel PV and a control switch 45 are further included, and the control switch 45 controls the first DC-DC conversion module 43 to connect to the solar panel PV or the power factor correction module 42, wherein the second end of the solar panel PV is connected to the ground end SGND. Figure 4 Each module in Figure 2 The structure and working principle are the same as in, and will not be repeated here.

[0065] When the light is sufficient, the control switch 45 controls the first DC-DC conversion module 43 to connect with the solar panel PV, the switches in the power factor correction module 42 and the second DC-DC conversion module 44 stop working, the street lamp LED does not emit light, and the switch in the first DC-DC conversion module 43 works. In this embodiment, the first DC-DC conversion module 43 is a bidirectional BUCK-BOOST topology structure, the switch Q3 and the switch Q4 are complementary turned on, and the voltage or current can be adjusted by adjusting the duty cycle of the switch Q3 and the switch Q4; the solar panel PV supplies power to the battery BT through the first DC-DC conversion module 43, and the battery BT stores the electric energy generated by the solar panel PV for driving the street lamp LED at night to further save electric energy. When the light is insufficient, the control switch 45 controls the first DC-DC conversion module 43 to be connected to the power factor correction module 42, and the battery BT supplies power to the street light LED through the first DC-DC conversion module 43 and the second DC-DC conversion module 44. The switch in the first DC-DC conversion module 43 works to keep the voltage across the capacitor C3 stable, and the switch Q5 in the second DC-DC conversion module 44 is turned on or off at a high frequency to adjust the current in the street light LED; when the power in the battery BT is insufficient, the alternating current AC first passes through the rectifier module 41 to obtain a DC voltage, and then passes through the power factor correction module 42 to obtain a bus voltage V bus , the bus voltage V bus The second DC-DC conversion module 44 is used to provide additional power to the street light LED. During off-peak hours, the AC power is firstly passed through the rectifier module 41 to obtain a DC voltage, and then passed through the power factor correction module 42 to obtain a bus voltage V bus , the bus voltage V bus The battery BT is charged through the second DC-DC conversion module 44 .

[0066] Figure 5 Another specific embodiment of the present invention is Figure 4 The difference between the embodiment shown in the figure is that the embodiment more specifically includes a digital controller 56, and the digital controller 56 outputs a switch control signal P Q1 , P Q2 , P Q3 , P Q4 , P Q5 , P 55 The switch control signal P Q1 , P Q2 , P Q3 , P Q4 , P Q5 , P 55The switches Q1 / Q2 / Q3 / Q4 / Q5 / 55 are controlled respectively. In addition, the digital controller 56 monitors the voltage at both ends of the street light LED. When the voltage is unstable, the switch 55 is switched to use the battery BT to supply power to avoid affecting the life of the street light LED. In addition, the digital controller 56 can charge and discharge according to the local peak and valley electricity time or the time required by itself, and the time of switching on and off the street light LED can also be adjusted according to the needs during charging and discharging.

[0067] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.

Claims

1. A circuit applied to a street lamp, characterized in that: include, A power factor correction module, which outputs a bus voltage; A first DC-DC conversion module, whose input end is connected in parallel with the output end of the power factor correction module, and whose output end is connected in parallel with a battery; The second DC-DC conversion module has an input end connected in parallel with the output end of the power factor correction module, and an output end connected in parallel with the street lamp.

2. A circuit for street lamps according to claim 1, characterized in that: During valley power, the bus voltage is generated by the power factor correction module, and the bus voltage charges the battery via the first DC-DC conversion module, or the bus voltage charges the battery via the first DC-DC conversion module and supplies power to the street lamp via the second DC-DC conversion module, or the bus voltage supplies power to the street lamp via the second DC-DC conversion module; during peak power, the battery is discharged via the first DC-DC conversion module to maintain the bus voltage, and the bus voltage supplies power to the street lamp via the second DC-DC conversion module.

3. The circuit for street lamps according to claim 2, characterized in that: It also includes a rectifier module, the input end of the rectifier module is connected to the alternating current, and the input end of the power factor correction module is connected in parallel with the output end of the rectifier module.

4. The circuit for street lamps according to claim 3, characterized in that: The rectifier module includes a first diode, a second diode, a third diode and a fourth diode, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the cathode of the fourth diode, the anode of the fourth diode is connected to the anode of the third diode, the cathode of the third diode is connected to the anode of the first diode, the first end of the alternating current is connected to the anode of the first diode, the second end of the alternating current is connected to the anode of the second diode, and the input end of the power factor correction module is connected in parallel with the cathode of the second diode and the anode of the third diode.

5. The circuit for street lamps according to claim 4, characterized in that: The power factor correction module includes a first capacitor, one end of which is connected to the cathode of the second diode, and the other end of which is connected to the anode of the third diode. a first transformer, a first end of a primary winding of which is connected to the cathode of the second diode, and a second end of a secondary winding of which is connected to a secondary ground terminal, a first switch tube, a first end of which is connected to the second end of the primary winding of the first transformer, A first resistor, one end of which is connected to the second end of the first switch tube, and the other end of which is connected to the primary ground terminal. a second switch tube, a second end of which is connected to a first end of a secondary winding of the first transformer, A second capacitor, a first end of which is connected to the first end of the second switch tube, a second end of which is connected to the second end of the secondary winding of the first transformer, and two ends of the second capacitor are connected to the input end of the first DC-DC conversion module.

6. The circuit for street lamps according to claim 5, characterized in that: The first DC-DC conversion module includes a third capacitor connected in parallel with the second capacitor. A third switch tube, a first end of which is connected to the first end of the third capacitor, a fourth switch tube, a first end of which is connected to the second end of the third switch tube, and a second end of which is connected to the second end of the third capacitor and the negative electrode of the battery, a first inductor, a first end of which is connected to the first end of the fourth switch tube, and a second end of which is connected to the positive electrode of the battery, A fourth capacitor has a first end connected to the second end of the first inductor, and a second end connected to the second end of the fourth switch tube.

7. A circuit for street lamps according to claim 6, characterized in that: The second DC-DC conversion module includes a fifth capacitor, a first end of which is connected to the first end of the second switch tube, and a second end of which is connected to the secondary ground terminal. a second inductor, a first end of which is connected to the first end of the fifth capacitor, a fifth switch tube, a first end of which is connected to the second end of the second inductor, and a second end of which is connected to the second end of the fifth capacitor, a fifth diode, an anode of which is connected to the first end of the fifth switch tube, and a cathode of which is connected to the first end of the street lamp, a sixth capacitor, a first end of which is connected to the cathode of the fifth diode, and a second end of which is connected to the second end of the fifth switch tube, A second resistor has one end connected to the second end of the sixth capacitor and the other end connected to the second end of the street lamp.

8. The circuit for street lamps according to claim 7, characterized in that: It also includes a digital controller, which outputs a control signal for controlling the first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube.

9. The circuit for street lamps according to claim 8, characterized in that: The digital controller monitors the voltage across the streetlight.

10. A circuit for street lamps according to any one of claims 1 to 7, characterized in that: It also includes a solar panel, which is connected to the input end of the first DC-DC conversion module to charge the battery or supply power to the street lamp.

11. The circuit for street lamp according to claim 10, characterized in that: It also includes a control switch for controlling the input end of the first DC-DC conversion module to connect to the output end of the solar cell panel or the power factor correction module.

12. A circuit for street lamps according to claim 11, characterized in that: When the input end of the first DC-DC conversion module is connected to the solar panel, the solar panel charges the battery via the first DC-DC conversion module.

13. A circuit for street lamps according to claim 12, characterized in that: It also includes a digital controller, which outputs a control signal for controlling the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the control switch.

14. A circuit for street lamps according to claim 13, characterized in that: The digital controller monitors the voltage across the streetlight.

Images