Switch power supply shared by photovoltaic power supply and commercial power

Abstract

The utility model relates to the technical field of switch power supplies, in particular to a switch power supply shared by photovoltaic power supply and commercial power. Comprising a first commercial power input port, a second commercial power input port, a first photovoltaic input port, a second photovoltaic input port, a first output port, a second output port, a rectification filtering module, a pulse width modulation module, a voltage stabilization output module, a photovoltaic conversion module and a switching module. The pulse width modulation module comprises a control chip U1; the switching module comprises a photoresistor CDS; and the photoresistor CDS is electrically connected with the control chip U1. According to the utility model, the photoresistor CDS is arranged, photovoltaic power supply or commercial power supply can be automatically switched according to illumination brightness, natural switching between a photovoltaic power supply and commercial power in daytime and at night is realized, natural energy is effectively utilized, the generating capacity is saved, the structure is simple, and the cost is effectively saved.

Description

Technical Field

[0001] The utility model relates to the technical field of switch power supplies, in particular to a switch power supply that uses photovoltaic power supply and city power supply. Background Art

[0002] A switch is a network device used to forward electrical (optical) signals. It can provide an exclusive electrical signal path for any two network nodes connected to the switch. The most common switch is the Ethernet switch. Other common switches include telephone voice switches, fiber optic switches, etc.

[0003] The current switch power supply system generally adopts two methods, the first is AC power supply, and the second is photovoltaic power supply. Currently, there are switch power supplies on the market that integrate both power supply methods, but they need to set up complex switching modules to enable automatic switching between AC power and photovoltaic power, which is relatively costly. Utility Model Content

[0004] The utility model aims to provide a switch power supply that shares photovoltaic power supply and city power supply in view of the above-mentioned deficiencies in the prior art.

[0005] The purpose of the utility model is achieved through the following technical solutions: a photovoltaic power supply and mains power shared switch power supply, comprising a first mains power input port, a second mains power input port, a first photovoltaic input port, a second photovoltaic input port, a first output port, a second output port, a rectifier filter module, a pulse width modulation module, a voltage stabilization output module, a photovoltaic conversion module and a switching module;

[0006] The input end of the rectifier and filter module is connected to the first mains input port and the second mains input port respectively; the output end of the rectifier and filter module is connected to the input end of the pulse width modulation module; the output end of the pulse width modulation module is connected to the input end of the voltage stabilization output module; the output end of the voltage stabilization output module is connected to the first output port and the second output port respectively;

[0007] The input end of the photovoltaic conversion module is connected to the first photovoltaic input port and the second photovoltaic input port respectively; the output end of the photovoltaic conversion module is connected to the first output port and the second output port respectively;

[0008] The pulse width modulation module includes a control chip U1; the switching module includes a photoresistor CDS; and the photoresistor CDS is electrically connected to the control chip U1.

[0009] The utility model is further configured that the control chip U1 includes an RI terminal, an FB terminal, a GATE terminal and a SEN terminal.

[0010] The utility model is further configured that the switching module further includes a diode D7, a voltage regulator ZD1, a resistor R35A, a capacitor C5, a resistor R33A, a resistor R34A and a diode D7A;

[0011] The positive electrode of the diode D7 is respectively connected to the RI terminal of the control chip U1 and the first AC power input port; the negative electrode of the diode D7 is connected to one end of the resistor R35A; the other end of the resistor R35A is grounded through the voltage regulator ZD1 and the capacitor C5; the other end of the resistor R35A is connected to one end of the photoresistor CDS through the resistor R33A; the other end of the photoresistor CDS is grounded through the resistor R34A; the other end of the photoresistor CDS is connected to the SEN terminal of the control chip U1 through the diode D7A.

[0012] The utility model is further configured that the photovoltaic power supply and AC power shared switch power supply also includes a fuse F1 and a thermistor NTC1; the first AC power input port is connected to one end of the fuse F1; the other end of the fuse F1 is connected to the input end of the rectifier and filter module through the thermistor NTC1.

[0013] The utility model is further configured that the photovoltaic power supply and the mains power common switch power supply also includes a varistor MOV1, a varistor MOV2, a varistor MOV3 and a lightning arrester DS1;

[0014] The other end of the fuse F1 is connected to the second mains input port through the varistor MOV2; the other end of the fuse F1 is connected to the second mains input port through the varistor MOV1 and the varistor MOV3 in sequence; the lightning arrester DS1 is arranged between the varistor MOV1 and the varistor MOV3.

[0015] The utility model is further configured as follows: the rectification and filtering module includes a rectifier bridge BD1 and a capacitor C28; the positive input end of the rectifier bridge BD1 is connected to the first AC input port; the negative input end of the rectifier bridge BD1 is connected to the second AC input port; the positive output end of the rectifier bridge BD1 is connected to the negative output end of the rectifier bridge BD1 through the capacitor C28.

[0016] The utility model is further configured as follows: the pulse width modulation module includes a transformer T4 and a switch tube Q4; one end of the primary side of the transformer T4 is connected to the output end of the rectifier and filter module; the other end of the primary side of the transformer T4 is grounded after passing through the switch end of the switch tube Q4; the control end of the switch tube Q4 is connected to the GATE end of the control chip U1; and the secondary side of the transformer T4 is connected to the voltage stabilization output module.

[0017] The utility model is further configured that a diode D6 is provided between the output end of the voltage-stabilizing output module and the first output port; and a diode D7 is provided between the output end of the photovoltaic conversion module and the first output port.

[0018] The utility model is further configured that the photovoltaic power supply and the AC power common switch power supply also includes an optical coupler U4; the transmitting end of the optical coupler U4 is connected to the output end of the voltage stabilizing output module; the receiving end of the optical coupler U4 is connected to the FB end of the control chip U1.

[0019] The utility model is further configured that the photovoltaic conversion module includes a transformer chip U2, an inductor L1, a switch tube Q1, a diode D5, a capacitor C1, a resistor R5 and a resistor R2;

[0020] The first photovoltaic input port is connected to the second photovoltaic input port through the capacitor C1; the first photovoltaic input port and the second photovoltaic input port are respectively connected to the input end of the transformer chip U2; one end of the inductor L1 is connected to the transformer chip U2; the other end of the inductor L1 is connected to the second output port through the switch end of the switch tube Q1; the control end of the switch tube Q1 is connected to the transformer chip U2 through the resistor R5; the control end of the switch tube Q1 is connected to the second output port through the resistor R2; the other end of the inductor L1 is connected to the first output port through the diode D5.

[0021] The beneficial effects of the utility model: the utility model can automatically switch between photovoltaic power supply and mains power supply according to the light brightness by setting the photoresistor CDS, thereby realizing the natural switching of photovoltaic power supply and mains power supply during the day and night, effectively utilizing natural energy, saving power generation, and having a simple structure and effectively saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0023] Figure 1 It is a circuit schematic diagram of the utility model;

[0024] Among them: 11, the first AC power input port; 12, the second AC power input port; 21, the first photovoltaic input port; 22, the second photovoltaic input port; 31, the first output port; 32, the second output port; 41, the rectifier and filter module; 42, the pulse width modulation module; 43, the voltage stabilization output module; 5, the photovoltaic conversion module; 6, the switching module. DETAILED DESCRIPTION

[0025] The utility model is further described in conjunction with the following embodiments.

[0026] Depend on Figure 1 It can be seen that the photovoltaic power supply and mains power shared switch power supply described in this embodiment includes a first mains power input port 11, a second mains power input port 12, a first photovoltaic input port 21, a second photovoltaic input port 22, a first output port 31, a second output port 32, a rectifier and filter module 41, a pulse width modulation module 42, a voltage stabilization output module 43, a photovoltaic conversion module 5 and a switching module 6;

[0027] The input end of the rectifier and filter module 41 is connected to the first mains input port 11 and the second mains input port 12 respectively; the output end of the rectifier and filter module 41 is connected to the input end of the pulse width modulation module 42; the output end of the pulse width modulation module 42 is connected to the input end of the voltage stabilization output module 43; the output end of the voltage stabilization output module 43 is connected to the first output port 31 and the second output port 32 respectively;

[0028] The input end of the photovoltaic conversion module 5 is connected to the first photovoltaic input port 21 and the second photovoltaic input port 22 respectively; the output end of the photovoltaic conversion module 5 is connected to the first output port 31 and the second output port 32 respectively;

[0029] The pulse width modulation module 42 includes a control chip U1 ; the switching module 6 includes a photoresistor CDS; and the photoresistor CDS is electrically connected to the control chip U1 .

[0030] Specifically, the photovoltaic power supply and the mains power share the switch power supply in this embodiment. When the mains power is used for power supply, the first mains power input port 11 and the second mains power input port 12 are connected to the mains respectively. The mains power passes through the rectifier and filter module 41 and is output to the pulse width modulation module 42. After the pulse width modulation module 42 performs pulse width modulation, a stable DC voltage is output to the first output port 31 and the second output port 32 through the voltage stabilization output module 43.

[0031] When photovoltaic power is supplied, the first photovoltaic input port 21 and the second photovoltaic input port 22 are connected to the photovoltaic power source respectively, and the photovoltaic power source is converted into voltage by the photovoltaic conversion module 5 and then output to the first output port 31 and the second output port 32 .

[0032] When the light is strong during the day, the resistance of the photoresistor CDS decreases, and the control chip U1 makes the pulse width of the PWM signal very small, so that the power supply of the mains end is in an inoperative state. When it is dark or at night, the resistance of the photoresistor CDS becomes very large, and the control chip U1 makes the PWM signal enter a normal working state, so that the power supply is supplied by the mains; this circuit realizes the natural switching of solar photovoltaic and mains during the day and night, effectively utilizes natural energy, and saves power generation.

[0033] In the photovoltaic power supply and city power supply shared switch power supply described in this embodiment, the control chip U1 includes an RI terminal, an FB terminal, a GATE terminal and a SEN terminal.

[0034] In this embodiment, a photovoltaic power supply and a city power supply are used to share a switch power supply, and the switching module 6 further includes a diode D7, a voltage regulator ZD1, a resistor R35A, a capacitor C5, a resistor R33A, a resistor R34A and a diode D7A;

[0035] The positive electrode of the diode D7 is respectively connected to the RI terminal of the control chip U1 and the first AC input port 11; the negative electrode of the diode D7 is connected to one end of the resistor R35A; the other end of the resistor R35A is grounded through the voltage regulator tube ZD1 and the capacitor C5; the other end of the resistor R35A is connected to one end of the photoresistor CDS through the resistor R33A; the other end of the photoresistor CDS is grounded through the resistor R34A; the other end of the photoresistor CDS is connected to the SEN terminal of the control chip U1 through the diode D7A.

[0036] Specifically, when the light is strong during the day, when the resistance of the photoresistor CDS drops to a certain resistance, the second well D7A reaches the conduction voltage value. When the light continues to increase, the voltage of the SEN end of the control chip U1 reaches 0.45V, and the internal comparator circuit of the SEN end of the control chip U1 starts to work, thereby protecting the output of the main PWM. When the circuit is in protection, the main PWM pulse width is very small, and the power supply of the main power end is in a non-working state. At this time, the solar photovoltaic power is stored in capacitor C1 to provide stable input power for DC conversion, but when it enters the weather without sunlight or at night, the resistance of the photoresistor CDS becomes very large, the diode D7A is in a completely cut-off state, and the AC PWM power supply enters a normal working state. This circuit realizes the natural switching of solar photovoltaic and main power during the day and night, effectively utilizing natural energy and saving power generation.

[0037] The photovoltaic power supply and the mains power common switch power supply described in this embodiment further includes a fuse F1 and a thermistor NTC1; the first mains power input port 11 is connected to one end of the fuse F1; the other end of the fuse F1 is connected to the input end of the rectifier filter module 41 through the thermistor NTC1. The photovoltaic power supply and the mains power common switch power supply described in this embodiment, the rectifier filter module 41 includes a rectifier bridge BD1 and a capacitor C28; the positive input end of the rectifier bridge BD1 is connected to the first mains power input port 11; the negative input end of the rectifier bridge BD1 is connected to the second mains power input port 12; the positive output end of the rectifier bridge BD1 is connected to the negative output end of the rectifier bridge BD1 through the capacitor C28.

[0038] Specifically, in this embodiment, through the above configuration, the input EMI rectification and filtering circuit composed of the inductor F1, thermistor NTC1, rectifier bridge BD1 and capacitor C28 can effectively prevent overcurrent or short circuit protection.

[0039] The photovoltaic power supply and the mains power supply shared switch power supply described in this embodiment further include a varistor MOV1, a varistor MOV2, a varistor MOV3 and a lightning arrester DS1;

[0040] The other end of the fuse F1 is connected to the second mains input port 12 through the varistor MOV2; the other end of the fuse F1 is connected to the second mains input port 12 through the varistor MOV1 and the varistor MOV3 in sequence; the lightning arrester DS1 is arranged between the varistor MOV1 and the varistor MOV3.

[0041] Specifically, through the above arrangement, a lightning protection circuit capable of resisting high lightning strikes can be formed to effectively protect the entire circuit.

[0042] The present embodiment describes a photovoltaic power supply and AC power sharing switch power supply, the pulse width modulation module 42 includes a transformer T4 and a switch tube Q4; one end of the primary side of the transformer T4 is connected to the output end of the rectifier and filter module 41; the other end of the primary side of the transformer T4 is grounded after passing through the switch end of the switch tube Q4; the control end of the switch tube Q4 is connected to the GATE end of the control chip U1; the secondary side of the transformer T4 is connected to the voltage stabilization output module 43.

[0043] Specifically, the control chip U1 is a Tongjia high-efficiency IC, model LD5523E, which ensures high-efficiency operation of the circuit, reduces losses, and improves reliability. This control chip U1 has OTP, OVP, and OLP protection functions. When there is any abnormality in the power supply, the control chip U1 will work in a protection state to protect the switching power supply.

[0044] In the photovoltaic power supply and city power common switch power supply described in this embodiment, a diode D6 is provided between the output end of the voltage-stabilizing output module 43 and the first output port 31; a diode D7 is provided between the output end of the photovoltaic conversion module 5 and the first output port 31. Specifically, the diode D6 and the diode D7 are used to isolate the output voltage when the AC power supply is used, prevent mutual interference, and ensure the stability of the output voltage.

[0045] The photovoltaic power supply and the mains power supply shared switch power supply described in this embodiment further include an optical coupler U4; the transmitting end of the optical coupler U4 is connected to the output end of the voltage stabilizing output module 43; the receiving end of the optical coupler U4 is connected to the FB end of the control chip U1. Specifically, the above-mentioned setting can play a role in feedback on the output of the mains power supply.

[0046] The photovoltaic power supply and the mains power supply share the switch power supply described in this embodiment, the photovoltaic conversion module 5 includes a transformer chip U2, an inductor L1, a switch tube Q1, a diode D5, a capacitor C1, a resistor R5 and a resistor R2;

[0047] The first photovoltaic input port 21 is connected to the second photovoltaic input port 22 through the capacitor C1; the first photovoltaic input port 21 and the second photovoltaic input port 22 are respectively connected to the input end of the transformer chip U2; one end of the inductor L1 is connected to the transformer chip U2; the other end of the inductor L1 is connected to the second output port 32 through the switch end of the switch tube Q1; the control end of the switch tube Q1 is connected to the transformer chip U2 through the resistor R5; the control end of the switch tube Q1 is connected to the second output port 32 through the resistor R2; the other end of the inductor L1 is connected to the first output port 31 through the diode D5.

[0048] Specifically, through the above settings, the 12V-24V voltage input from the first photovoltaic input port 21 and the second photovoltaic input port 22 is converted into a 24V DC voltage. Capacitors C1, C2, C3, and C3A are input energy storage capacitors, and the stored energy can maintain the stability of instantaneous changes in sunlight.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A photovoltaic power supply and city power supply shared switch power supply, characterized in that: It comprises a first mains power input port (11), a second mains power input port (12), a first photovoltaic input port (21), a second photovoltaic input port (22), a first output port (31), a second output port (32), a rectifier and filter module (41), a pulse width modulation module (42), a voltage stabilization output module (43), a photovoltaic conversion module (5) and a switching module (6); The input end of the rectifying and filtering module (41) is respectively connected to the first mains input port (11) and the second mains input port (12); the output end of the rectifying and filtering module (41) is connected to the input end of the pulse width modulation module (42); the output end of the pulse width modulation module (42) is connected to the input end of the voltage stabilizing output module (43); the output end of the voltage stabilizing output module (43) is respectively connected to the first output port (31) and the second output port (32); The input end of the photovoltaic conversion module (5) is respectively connected to the first photovoltaic input port (21) and the second photovoltaic input port (22); the output end of the photovoltaic conversion module (5) is respectively connected to the first output port (31) and the second output port (32); The pulse width modulation module (42) comprises a control chip U1; the switching module (6) comprises a photoresistor CDS; the photoresistor CDS is electrically connected to the control chip U1.

2. A photovoltaic power supply and city power common switch power supply according to claim 1, characterized in that: The control chip U1 includes an RI terminal, an FB terminal, a GATE terminal and a SEN terminal.

3. A photovoltaic power supply and city power common switch power supply according to claim 2, characterized in that: The switching module (6) further includes a diode D7, a voltage regulator diode ZD1, a resistor R35A, a capacitor C5, a resistor R33A, a resistor R34A and a diode D7A; The positive electrode of the diode D7 is respectively connected to the RI terminal of the control chip U1 and the first mains input port (11); the negative electrode of the diode D7 is connected to one end of a resistor R35A; the other end of the resistor R35A is grounded via a voltage-stabilizing tube ZD1 and a capacitor C5; the other end of the resistor R35A is connected to one end of a photoresistor CDS via a resistor R33A; the other end of the photoresistor CDS is grounded via a resistor R34A; the other end of the photoresistor CDS is connected to the SEN terminal of the control chip U1 via a diode D7A.

4. A photovoltaic power supply and city power common switch power supply according to claim 1, characterized in that: The photovoltaic power supply and mains power common switch power supply also includes a fuse F1 and a thermistor NTC1; the first mains power input port (11) is connected to one end of the fuse F1; the other end of the fuse F1 is connected to the input end of the rectifier filter module (41) through the thermistor NTC1.

5. A photovoltaic power supply and city power common switch power supply according to claim 4, characterized in that: The photovoltaic power supply and mains power common switch power supply also includes a varistor MOV1, a varistor MOV2, a varistor MOV3 and a lightning arrester DS1; The other end of the fuse F1 is connected to the second mains input port (12) through the varistor MOV2; the other end of the fuse F1 is connected to the second mains input port (12) through the varistor MOV1 and the varistor MOV3 in sequence; the lightning arrester DS1 is arranged between the varistor MOV1 and the varistor MOV3.

6. A photovoltaic power supply and city power common switch power supply according to claim 1, characterized in that: The rectifier filter module (41) comprises a rectifier bridge BD1 and a capacitor C28; the positive input end of the rectifier bridge BD1 is connected to a first mains power input port (11); the negative input end of the rectifier bridge BD1 is connected to a second mains power input port (12); and the positive output end of the rectifier bridge BD1 is connected to a negative output end of the rectifier bridge BD1 via the capacitor C28.

7. A photovoltaic power supply and city power common switch power supply according to claim 2, characterized in that: The pulse width modulation module (42) comprises a transformer T4 and a switch tube Q4; one end of the primary side of the transformer T4 is connected to the output end of the rectifier filter module (41); the other end of the primary side of the transformer T4 is grounded via the switch end of the switch tube Q4; the control end of the switch tube Q4 is connected to the GATE end of the control chip U1; and the secondary side of the transformer T4 is connected to the voltage stabilization output module (43).

8. A photovoltaic power supply and city power common switch power supply according to claim 1, characterized in that: A diode D6 is provided between the output end of the voltage-stabilizing output module (43) and the first output port (31); and a diode D7 is provided between the output end of the photovoltaic conversion module (5) and the first output port (31).

9. A photovoltaic power supply and city power common switch power supply according to claim 2, characterized in that: The photovoltaic power supply and mains power common switch power supply further comprises an optical coupler U4; the transmitting end of the optical coupler U4 is connected to the output end of the voltage stabilizing output module (43); the receiving end of the optical coupler U4 is connected to the FB end of the control chip U1.

10. A photovoltaic power supply and city power common switch power supply according to claim 1, characterized in that: The photovoltaic conversion module (5) comprises a transformer chip U2, an inductor L1, a switch tube Q1, a diode D5, a capacitor C1, a resistor R5 and a resistor R2; The first photovoltaic input port (21) is connected to the second photovoltaic input port (22) via a capacitor C1; the first photovoltaic input port (21) and the second photovoltaic input port (22) are respectively connected to the input end of a transformer chip U2; one end of the inductor L1 is connected to the transformer chip U2; the other end of the inductor L1 is connected to the second output port (32) via a switch end of a switch tube Q1; the control end of the switch tube Q1 is connected to the transformer chip U2 via a resistor R5; the control end of the switch tube Q1 is connected to the second output port (32) via a resistor R2; and the other end of the inductor L1 is connected to the first output port (31) via a diode D5.

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