Relay control module and circuit applied to street lamp

Abstract

The utility model discloses a relay control module and a circuit applied to a street lamp, and belongs to the technical field of electric energy conversion, the relay control module comprises a first switch, a second switch, a first resistor, a first voltage stabilizing diode and a first capacitor, the first end of a coil of the relay module is connected with the drain electrode of the first switch, and the source electrode of the first switch is grounded; a grid electrode of the first switch is connected with a control signal, a coil second end of the relay module is connected with an emitter electrode of the second switch, a collector electrode of the second switch is connected with a switch first end of the relay module, a first end of the first resistor is connected with the collector electrode of the second switch, and a second end of the first resistor is connected with a base electrode of the second switch. The base electrode of the second switch is connected with the cathode of the first voltage-regulator diode, the anode of the first voltage-regulator diode is grounded, the first end of the first capacitor is connected with the emitter electrode of the second switch, and the second end of the first capacitor is grounded. According to the utility model, stable voltage can be provided for the relay, and stable power supply can be provided for the street lamp LED.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy conversion, and in particular to a relay control module and a circuit applied to a street lamp. Background Art

[0002] A relay is an electrical control device. When the change of the input quantity (excitation quantity) reaches the specified requirement, it causes the controlled quantity to undergo a predetermined step change in the electrical output circuit. It is a commonly used switching device in the field of electric energy conversion technology.

[0003] For example, Figure 1 The circuit shown is applied to street lamps, including 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, and also includes a relay module 15 and a relay control module 16. The input end of the rectifier module 11 is connected to the alternating current AC, the output end of the rectifier module 11 is connected to the input end of the power factor correction module 12, the output positive end of the power factor correction module 12 is connected to the input positive end of the first DC-DC conversion module 13 through the relay module 15, the output negative end of the power factor correction module 12 is connected to the input negative end of the first DC-DC conversion module 13, and the output end of the first DC-DC conversion module 13 is connected in parallel with a battery BT. The output positive end of the power factor correction module 12 is connected to the input positive end of the second DC-DC conversion module 14 through the relay module 15, the output negative end of the power factor correction module 12 is connected to the input negative end of the second DC-DC conversion module 14, and the output end of the second DC-DC conversion module 14 is connected in parallel with a street lamp LED. The relay module 15 is also connected to a first end of the solar panel PV to control the first DC-DC conversion module 13 and the second DC-DC conversion module 14 to be connected to the solar panel PV or the power factor correction module 12, wherein a second end of the solar panel PV is connected to the ground SGND.

[0004] When the light is sufficient, the relay module 15 controls the first DC-DC conversion module 13 to connect with the solar panel PV to charge the battery BT, the power factor correction module 12 and the second DC-DC conversion module 14 stop working, and the street light LED does not emit light. When the light is insufficient, the relay module 15 controls the first DC-DC conversion module 13 to connect with the power factor correction module 12, and the battery BT supplies power to the street light LED through the first DC-DC conversion module 13 and the second DC-DC conversion module 14; when the battery BT is insufficient in power, the alternating current AC first passes through the rectifier module 11 to obtain a DC voltage, and then passes through the power factor correction module 12 to obtain a bus voltage V bus, the bus voltage V bus The second DC-DC conversion module 14 is used to provide additional power to the street light LED. During off-peak hours, the AC power first passes through the rectifier module 11 to obtain a DC voltage, and then passes through the power factor correction module 12 to obtain a bus voltage V bus , the bus voltage V bus The battery BT is charged by the second DC-DC conversion module 14, thereby achieving the purpose of saving electric energy.

[0005] It can be seen that providing a reliable relay control module is the basis for ensuring that different power supply sources can be switched to provide stable power supply for street light LEDs. Utility Model Content

[0006] The utility model aims to provide a relay control module.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is:

[0008] A relay control module comprises a first switch, a second switch, a first resistor, a first voltage-stabilizing diode and a first capacitor, wherein a first end of a coil of the relay module is connected to a drain of the first switch, a source of the first switch is grounded, a gate of the first switch is connected to a control signal, a second end of the coil of the relay module is connected to an emitter of the second switch, a collector of the second switch is connected to a first end of the switch of the relay module, a first end of the first resistor is connected to a collector of the second switch, a second end of the first resistor is connected to a base of the second switch, a base of the second switch is connected to a cathode of the first voltage-stabilizing diode, an anode of the first voltage-stabilizing diode is grounded, a first end of the first capacitor is connected to an emitter of the second switch, and a second end of the first capacitor is connected to an anode of the first voltage-stabilizing diode.

[0009] The above-mentioned relay control module further includes a first diode, wherein an anode of the first diode is connected to a first end of a coil of the relay module, and a cathode of the first diode is connected to a second end of the coil of the relay module.

[0010] The above-mentioned relay control module further includes a second resistor and a second capacitor, the gate of the first switch is connected to the first end of the second resistor, the second end of the second resistor is connected to the control signal, and the gate of the first switch is grounded through the second capacitor.

[0011] The above-mentioned relay control module further includes a third resistor, and the gate of the first switch is grounded through the third resistor.

[0012] In a specific embodiment, the control signal is generated by a single chip microcomputer.

[0013] The present invention also provides a circuit applied to a street lamp, comprising a relay control module as described above, and also comprising a power factor correction module, a first DC-DC conversion module and a second DC-DC conversion module, wherein the output positive end of the power factor correction module is connected to the first end of the switch of the relay module, the second end of the switch of the relay module is connected to the input positive end of the first DC-DC conversion module, the output negative end of the power factor correction module is connected to the input negative end of the first DC-DC conversion module, and the output end of the first DC-DC conversion module is connected in parallel with a battery; the second end of the switch of the relay module is connected to the input positive end of the second DC-DC conversion module, the output negative end of the power factor correction module is connected to the input negative end of the second DC-DC conversion module, the output end of the second DC-DC conversion module is connected in parallel with a street lamp, the third end of the switch of the relay module is connected to a solar cell panel, and the relay control module controls the relay module.

[0014] The above-mentioned circuit for street lamps further includes a second diode, wherein the anode of the second diode is connected to the solar cell panel, and the cathode of the second diode is connected to the first terminal of the switch of the relay module.

[0015] The above-mentioned circuit applied to street lamps further includes a rectifier module, the input end of the rectifier module is connected to alternating current, and the input end of the power factor correction module is connected in parallel with the output end of the rectifier module.

[0016] In a specific embodiment, the first DC-DC conversion module is a bidirectional BUCK-BOOST topology.

[0017] In a specific embodiment, the second DC-DC conversion module is a BOOST topology.

[0018] Beneficial effect: The utility model provides a relay control module and a circuit applied to a street lamp, which can provide reliable switching, and can provide a stable voltage for the relay; and provide a stable power supply for the street lamp LED.

[0019] In order to make the above features and advantages of the utility model more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the structure of a circuit applied to street lamps.

[0021] Figure 2 The utility model is a circuit diagram of a relay control module. DETAILED DESCRIPTION

[0022] In order to make the purpose and technical solution of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Figure 2 This is a circuit diagram of a relay control module of the utility model. Figure 2 As shown, the utility model provides a relay control module 26 including a switch Q6, a resistor R3, a resistor R4, a capacitor C8, a resistor R5, a switch Q7, a voltage-stabilizing diode ZD1, a capacitor C7, and a diode D6, wherein the anode of the diode D6 is connected to the first end of the coil of the relay module 25, the cathode of the diode D6 is connected to the second end of the coil of the relay module 25, the second end of the coil of the relay module 25 is connected to the emitter of the switch Q7, the collector of the switch Q7 is connected to the positive output end of the power factor correction module 22, the first end of the resistor R5 is connected to the collector of the switch Q7, the second end of the resistor R5 is connected to the base of the switch Q7, the base of the switch Q7 is connected to the cathode of the voltage-stabilizing diode ZD1, the anode of the voltage-stabilizing diode ZD1 is grounded SGND, the first end of the capacitor C7 is connected to the emitter of the switch Q7, and the second end of the capacitor C7 is grounded SGND. A first end of the coil of the relay module 25 is connected to the drain of the switch Q6, a source of the switch Q6 is connected to the ground SGND, a gate of the switch Q6 is connected to a first end of the resistor R3, a second end of the resistor R3 is connected to the control signal G1, a gate of the switch Q6 is connected to the ground SGND via the resistor R4, and a gate of the switch Q6 is connected to the ground SGND via the capacitor C8.

[0024] Optionally, the switch Q6 is an N-channel MOSFET.

[0025] More specifically, after the control signal G1 is filtered by the capacitor C8 and the resistor R3, it controls the on and off of the switch Q6. When the switch Q6 is on, the first end of the coil of the relay module 25 is grounded, the coil of the relay module 25 is energized, and the switch of the relay module 25 is switched so that the power factor correction module 22 is connected to the first DC-DC conversion module 23. When the switch Q6 is off, the switch of the relay module 25 is not switched, and the first DC-DC conversion module 23 is connected to the solar panel PV.

[0026] Furthermore, the control signal G1 is generated by a single chip microcomputer, and may also be generated by other control modules.

[0027] More specifically, the resistor R4 prevents the gate from floating and provides a discharge path for the parasitic capacitance of the switch Q6.

[0028] Furthermore, the switch Q7, the voltage stabilizing diode ZD1, the capacitor C7, and the resistor R5 form a linear voltage stabilizing circuit, the purpose of which is to provide a stable voltage for the second end of the coil of the relay module 25. The breakdown voltage V Z1 Determines the voltage bias of the relay module 25, which is approximately V Z1 -0.7V. The resistor R5 is used to limit the current flowing through the voltage stabilizing diode ZD1. The switch Q7 is a triode, which works in the variable resistance area and bears the bus voltage V bus The voltage drop to the second end of the coil of the relay module 25 keeps the voltage across the coil of the relay module 25 stable. The function of the capacitor C7 is to help maintain the voltage.

[0029] Furthermore, the diode D6 serves to provide a freewheeling circuit when the coil inductance of the relay module 25 is reset.

[0030] Furthermore, the utility model further comprises a relay control module of a diode D7, wherein the anode of the diode D7 is connected to the first end of the solar panel PV, and the cathode of the diode D7 is connected to the positive output end of the power factor correction module 22. When the alternating current AC is powered off and the second DC-DC conversion module 24 is powered, the relay module 25 may be in a default state (i.e., connected to the solar panel PV) due to the lack of power in the busbar, and the presence of the diode D7 enables the second DC-DC conversion module 24 to still raise the busbar voltage V bus , so that the bus is restored, and the relay module 25 can normally switch to the state of connecting the bus and the second DC-DC conversion module 24.

[0031] 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.

[0032] The power factor correction module 22 is a flyback conversion topology in this specific embodiment, but the present invention is not limited thereto, and other topologies with a DC-DC conversion function can be used. The power factor correction module 22 includes a capacitor C1, a capacitor C2, a switch Q1, a switch Q2, a resistor R1 and a transformer T1. The first end of the capacitor C1 is connected to the cathode of the diode D2, the second 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, the second end of the primary winding of the transformer T1 is connected to the drain of the switch Q1, the first end of the resistor R1 is connected to the source of the switch Q1, the second end of the resistor R1 is grounded PGND, the first end of the secondary winding of the transformer T1 is connected to the source of the switch Q2, the first end of the capacitor C2 is connected to the drain of the switch 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 grounded SGND, and the first end of the capacitor C2 is connected to the first end of the switch of the relay module 25.

[0033] Optionally, the switch Q1 and the switch Q2 are N-channel MOSFETs.

[0034] The first DC-DC conversion module 23 is a bidirectional BUCK-BOOST topology in this specific embodiment, but the utility model is not limited to this, and other topologies with bidirectional DC-DC conversion functions can be used. The first DC-DC conversion module 23 includes a capacitor C3, a capacitor C4, a switch Q3, a switch Q4 and an inductor L1, the first end of the capacitor C3 is connected to the second end of the relay module 25 switch, the second end of the capacitor C3 is grounded SGND, the third end of the relay module 25 switch is connected to the first end of the solar panel PV, the drain of the switch Q3 is connected to the first end of the capacitor C3, the source of the switch Q3 is connected to the drain of the switch Q4, the source of the switch 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 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 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 Q4.

[0035] Optionally, the switch Q3 and the switch Q4 are N-channel MOSFETs.

[0036] The second DC-DC conversion module 24 is a BOOST topology in this specific embodiment, but the utility model is not limited to this, and other topologies with DC-DC conversion functions can be used. The second DC-DC conversion module 24 includes a capacitor C5, a capacitor C6, an inductor L2, a switch Q5, a diode D5 and a resistor R2, the first end of the capacitor C5 is connected to the second end of the relay module 25 switch, the second end of the capacitor C5 is grounded 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 Q5, the source of the switch 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 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 Q5, the first end of the resistor R2 is connected to the second end of the capacitor C6, the second end of the resistor R2 is connected to the cathode of the street light LED, and the anode of the street light LED is connected to the cathode of the diode D5.

[0037] Optionally, the switch Q5 is an N-channel MOSFET.

[0038] Furthermore, the brightness of the street lamp LED can be adjusted by adjusting the driving signal of the switch in the second DC-DC conversion module 24 .

[0039] Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. A relay control module, characterized in that: The invention comprises a first switch (Q6), a second switch (Q7), a first resistor (R5), a first voltage-stabilizing diode (ZD1) and a first capacitor (C7); a first end of a coil of a relay module (25) is connected to a drain of the first switch (Q6); a source of the first switch (Q6) is grounded; a gate of the first switch (Q6) is connected to a control signal (G1); a second end of the coil of the relay module (25) is connected to an emitter of the second switch (Q7); a collector of the second switch (Q7) is connected to a first end of the switch of the relay module (25); a first end of the first resistor (R5) is connected to a collector of the second switch (Q7); a second end of the first resistor (R5) is connected to a base of the second switch (Q7); a base of the second switch (Q7) is connected to a cathode of the first voltage-stabilizing diode (ZD1); an anode of the first voltage-stabilizing diode (ZD1) is grounded; a first end of the first capacitor (C7) is connected to an emitter of the second switch (Q7); and a second end of the first capacitor (C7) is connected to an anode of the first voltage-stabilizing diode (ZD1).

2. A relay control module as claimed in claim 1, characterized in that: It also includes a first diode (D6), wherein the anode of the first diode (D6) is connected to the first end of the coil of the relay module (25), and the cathode of the first diode (D6) is connected to the second end of the coil of the relay module (25).

3. A relay control module as claimed in claim 2, characterized in that: It also includes a second resistor (R3) and a second capacitor (C8), the gate of the first switch (Q6) is connected to the first end of the second resistor (R3), the second end of the second resistor (R3) is connected to the control signal (G1), and the gate of the first switch (Q6) is grounded through the second capacitor (C8).

4. A relay control module as claimed in claim 3, characterized in that: A third resistor (R4) is also included, and the gate of the first switch (Q6) is grounded through the third resistor (R4).

5. A relay control module as claimed in claim 4, characterized in that: The control signal (G1) is generated by a single chip microcomputer.

6. A circuit applied to a street lamp, characterized in that: A relay control module (26) comprising a relay control module (26) as claimed in any one of claims 1 to 5, further comprising a power factor correction module (22), a first DC-DC conversion module (23) and a second DC-DC conversion module (24), wherein the output positive end of the power factor correction module (22) is connected to the first switch end of the relay module (25), the second switch end of the relay module (25) is connected to the input positive end of the first DC-DC conversion module (23), and the output negative end of the power factor correction module (22) is connected to the output negative end of the first DC-DC conversion module (23). an input negative terminal, an output terminal of the first DC-DC conversion module (23) is connected in parallel with a battery; a second switch terminal of the relay module (25) is connected to an input positive terminal of the second DC-DC conversion module (24), an output negative terminal of the power factor correction module (22) is connected to an input negative terminal of the second DC-DC conversion module (24), an output terminal of the second DC-DC conversion module (24) is connected in parallel with a street lamp, a third switch terminal of the relay module (25) is connected to a solar cell panel (PV), and the relay control module (26) controls the relay module (25).

7. A circuit for street lamps as claimed in claim 6, characterized in that: It also includes a second diode (D7), wherein the anode of the second diode (D7) is connected to the solar cell panel (PV), and the cathode of the second diode (D7) is connected to the first end of the switch of the relay module (25).

8. A circuit for street lamps as claimed in claim 7, characterized in that: It also comprises a rectifier module (21), the input end of the rectifier module (21) being connected to alternating current, and the input end of the power factor correction module (22) being connected in parallel to the output end of the rectifier module (21).

9. A circuit for street lamps as claimed in claim 8, characterized in that: The first DC-DC conversion module (23) is a bidirectional BUCK-BOOST topology.

10. A circuit for street lamps as claimed in claim 9, characterized in that: The second DC-DC conversion module (24) is a BOOST topology.

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