Outdoor monitoring camera dual-power supply circuit

Abstract

The utility model discloses a dual-power supply circuit for an outdoor monitoring camera in the field of outdoor power supply, which comprises a photovoltaic inverter V1 and a mains supply V2, the photovoltaic inverter V1 is connected with a switching control circuit I through a logic judgment circuit I, the mains supply V2 is connected with a switching control circuit II through a logic judgment circuit II, and the switching control circuit II is connected with a switching control circuit III through a logic judgment circuit III. The first logical judgment circuit is connected with the second logical judgment circuit, and the first switching control circuit is connected with the second switching control circuit. When the main power supply can guarantee normal power supply and the standby power supply is in a power-off state, the main power supply is still used as a power supply; when the main power supply is in a power-off state and the standby power supply can guarantee normal power supply, the standby power supply can be automatically detected and rapidly switched to supply power, and at the moment, V3 is equal to standby power supply input V2. Commercial power and photovoltaic power supply can be combined, automatic power supply switching is achieved, and it is ensured that the outdoor camera can work continuously.

Description

Technical Field

[0001] This utility model relates to a dual power supply circuit for outdoor surveillance cameras in the field of camera power supply technology. Background Technology

[0002] Security surveillance cameras are a crucial component of security monitoring systems and are widely used in both public and private locations. As the name suggests, security surveillance cameras are installed for security protection. Outdoor security surveillance cameras are typically powered by mains electricity or solar panels. However, this power supply method is limited; if the mains power fails or the solar inverter malfunctions, the camera will be unusable. Utility Model Content

[0003] The purpose of this invention is to provide a dual-power supply circuit for outdoor surveillance cameras, which combines mains power and photovoltaic power to achieve automatic power switching and ensure that the outdoor cameras can work continuously.

[0004] To achieve the above objectives, this utility model provides a dual power supply circuit for an outdoor surveillance camera, including a photovoltaic inverter power supply V1 and a mains power supply V2. The photovoltaic inverter power supply V1 is connected to a switching control circuit 1 via a logic judgment circuit 1, and the mains power supply V2 is connected to a switching control circuit 2 via a logic judgment circuit 2. The logic judgment circuit 1 is connected to the logic judgment circuit 2, and the switching control circuit 1 and the switching control circuit 2 are connected.

[0005] Compared with existing technologies, the beneficial effects of this utility model are that both the photovoltaic inverter power supply and the mains power supply are AC, with the photovoltaic inverter power supply as the main power supply and the mains power supply as the backup power supply. When both the main power supply and the backup power supply can guarantee normal power supply, the photovoltaic inverter power supply is selected as the power supply. At this time, the output V3 of the dual-power uninterruptible power supply circuit is equal to V1. When the main power supply can guarantee normal power supply and the backup power supply is in a power failure state, the main power supply still serves as the power supply. When the main power supply is in a power failure state and the backup power supply can guarantee normal power supply, it can automatically detect and quickly switch to the backup power supply. At this time, V3 is equal to the backup power supply input V2. This allows for the combination of mains power and photovoltaic power supply to achieve automatic power switching, ensuring the outdoor camera can operate continuously.

[0006] As a further improvement of this utility model, the logic judgment circuit one includes an inverter U1. The input terminal of the inverter U1 is connected to the photovoltaic inverter power supply V1. The output terminal of the inverter U1 is connected to pin 1 of the three-terminal regulator U3 and the switching control circuit one. Pin 2 of the three-terminal regulator U3 is grounded. Pin 3 of the three-terminal regulator U3 is connected to pin 1 of the NOT gate A1. Pin 2 of the NOT gate A1 is connected to pin 1 of the NOT gate A2. Pin 2 of the NOT gate A2 is connected to the switching control circuit one and the logic judgment circuit two.

[0007] When the photovoltaic inverter V1 is powered, it outputs a stable high-level signal to NOT gate A1 after passing through inverter U1 and three-terminal regulator U3. NOT gate A1 outputs a low-level signal to NOT gate A2, and NOT gate A2 outputs a high-level signal. Conversely, if the photovoltaic inverter V1 fails and is not powered, NOT gate A2 will output a low level.

[0008] As a further improvement of this utility model, the switching control circuit includes a relay K1. The normally open contacts 1 and 4 of the relay K1 are connected to the photovoltaic inverter power supply V1. One end of the coil of the relay K1 is connected to the collector of the transistor T1. The base of the transistor T1 is connected to the 2nd pin of the NOT gate A2 via the resistor R1. The emitter of the transistor T1 is connected to the anode of the diode D1 and grounded. The cathode of the diode D1 is connected to the output terminal of the inverter U1 and the other end of the coil of the relay K1.

[0009] When the photovoltaic inverter power supply V1 is powered, the NOT gate A2 outputs a high-level signal, which energizes the coil of relay K1 and causes it to close. This closes the normally open contact of relay K1, thus outputting the voltage of the photovoltaic inverter power supply. Conversely, when the photovoltaic inverter power supply V1 is de-energized, the normally open contact of relay K1 does not operate, and the output is zero.

[0010] As a further improvement of this utility model, the second logic judgment circuit includes an inverter U2. The input terminal of the inverter U2 is connected to the mains power supply V2. The output terminal of the inverter U2 is connected to pin 1 of the three-terminal regulator U4 and the second switching control circuit. Pin 2 of the three-terminal regulator U4 is grounded. Pin 3 of the three-terminal regulator U4 is connected to pin 1 of the NOT gate A3. Pin 2 of the NOT gate A3 is connected to pin 1 of the NOT gate A4. Pin 2 of the NOT gate A4 is connected to pin 2 of the NAND gate B1. Pin 1 of the NAND gate B1 is connected to pin 2 of the NOT gate A2. Pin 3 of the NAND gate B1 is connected to the second switching control circuit.

[0011] When the mains power supply is available, the inverter U2 and the three-terminal regulator U4 output a high level, causing NOT gate A3 to output a low level. NOT gate A4 then outputs a high level to pin 2 of the NAND gate. If the photovoltaic inverter power supply is available at this time, pin 1 of the NAND gate B1 receives a high level, causing NAND gate B1 to output a low level. When the mains power supply is available but the inverter power supply is not, NAND gate B1 outputs a high level. When the mains power supply is not available but the inverter power supply is available, NAND gate B1 outputs a high level. When both the mains power supply and the inverter power supply are not available, NAND gate B1 outputs a high level.

[0012] As a further improvement of this utility model, the switching control circuit two includes a relay K2. The normally open contacts 1 and 4 of the relay K2 are connected to the mains power supply V2. One end of the coil of the relay K2 is connected to the collector of the transistor T2. The base of the transistor T2 is connected to the 3rd pin of the NAND gate B1 via a resistor R2. The emitter of the transistor T2 is connected to the anode of the diode D2 and grounded. The cathode of the diode D2 is connected to the output terminal of the inverter U2 and the other end of the coil of the relay K2. The normally open contact 3 of the relay K2 is connected to the normally open contact 3 of the relay K1. The normally open contact 6 of the relay K2 is connected to the normally open contact 6 of the relay K1 via an inductor L.

[0013] When both the mains power supply and the photovoltaic inverter power supply are active, the NOT gate B1 outputs a high level signal, while the NAND gate outputs a low level signal, causing the coil of relay K2 to be de-energized and its normally open contact to remain closed, resulting in no output voltage from relay K2. When the mains power supply is active but the inverter power supply is not, the NAND gate B1 outputs a high level, energizing the coil of relay K2 and causing its normally open contact to close, resulting in relay K2 outputting the mains power voltage. When the mains power supply is not active but the inverter power supply is active, the NAND gate B1 outputs a high level, energizing the coil of relay K2 and causing its normally open contact to close, resulting in no output voltage from relay K2. When both the mains power supply and the inverter power supply are not active, the NAND gate B1 outputs a high level, energizing the coil of relay K2 and causing its normally open contact to close, resulting in no output voltage from relay K2. Attached Figure Description

[0014] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] like Figure 1The outdoor surveillance camera dual power supply circuit shown includes a photovoltaic inverter power supply V1 and a mains power supply V2. The photovoltaic inverter power supply V1 is connected to the switching control circuit 1 via a logic judgment circuit 1, and the mains power supply V2 is connected to the switching control circuit 2 via a logic judgment circuit 2. The logic judgment circuit 1 is connected to the logic judgment circuit 2, and the switching control circuit 1 and the switching control circuit 2 are connected.

[0017] The logic judgment circuit one includes an inverter U1. The input terminal of the inverter U1 is connected to the photovoltaic inverter power supply V1. The output terminal of the inverter U1 is connected to pin 1 of the three-terminal voltage regulator U3 and the switching control circuit one. Pin 2 of the three-terminal voltage regulator U3 is grounded. Pin 3 of the three-terminal voltage regulator U3 is connected to pin 1 of NOT gate A1. Pin 2 of NOT gate A1 is connected to pin 1 of NOT gate A2. Pin 2 of NOT gate A2 is connected to the switching control circuit one and the logic judgment circuit two.

[0018] The switching control circuit includes a relay K1. The normally open contacts 1 and 4 of the relay K1 are connected to the photovoltaic inverter power supply V1. One end of the coil of the relay K1 is connected to the collector of the transistor T1. The base of the transistor T1 is connected to the 2nd pin of the NOT gate A2 via the resistor R1. The emitter of the transistor T1 is connected to the anode of the diode D1 and grounded. The cathode of the diode D1 is connected to the output terminal of the inverter U1 and the other end of the coil of the relay K1.

[0019] The second logic judgment circuit includes an inverter U2. The input terminal of the inverter U2 is connected to the mains power supply V2. The output terminal of the inverter U2 is connected to pin 1 of the three-terminal regulator U4 and the second switching control circuit. Pin 2 of the three-terminal regulator U4 is grounded. Pin 3 of the three-terminal regulator U4 is connected to pin 1 of NOT gate A3. Pin 2 of NOT gate A3 is connected to pin 1 of NOT gate A4. Pin 2 of NOT gate A4 is connected to pin 2 of NAND gate B1. Pin 1 of NAND gate B1 is connected to pin 2 of NOT gate A2. Pin 3 of NAND gate B1 is connected to the second switching control circuit.

[0020] The switching control circuit 2 includes relay K2. The normally open contacts 1 and 4 of relay K2 are connected to the mains power supply V2. One end of the coil of relay K2 is connected to the collector of transistor T2. The base of transistor T2 is connected to pin 3 of NAND gate B1 via resistor R2. The emitter of transistor T2 is connected to the anode of diode D2 and grounded. The cathode of diode D2 is connected to the output terminal of inverter U2 and the other end of the coil of relay K2. The normally open contact 3 of relay K2 is connected to the normally open contact 3 of relay K1. The normally open contact 6 of relay K2 is connected to the normally open contact 6 of relay K1 via inductor L.

[0021] In this invention, the voltage of the photovoltaic inverter power supply is 220V AC power output from the photovoltaic panel after outputting DC power, while the mains power is directly output as 220V AC power.

[0022] The circuit has four power supply states, as follows:

[0023] When both the photovoltaic inverter and the mains power supply are powered, the output voltage of the photovoltaic inverter, after passing through inverter U1 and three-terminal regulator U3, outputs a stable high-level signal to NOT gate A1. NOT gate A1 outputs a low-level signal to NOT gate A2, which in turn outputs a high-level signal to pin 1 of the NAND gate and the coil of relay K1. This energizes the coil of relay K1, causing its normally open contact to close, and pins 3 and 6 output the photovoltaic inverter voltage. Meanwhile, the mains power supply voltage, after passing through inverter U2 and three-terminal regulator U4, outputs a high level. NOT gate A3 outputs a low level, and NOT gate A4 outputs a high level to pin 2 of the NAND gate. Thus, pins 1 and 2 of NAND gate B1 both input a high level, and its output is low. Consequently, the coil of relay K2 is not energized, its normally open contact does not close, and pins 3 and 6 of relay K2 have no voltage output. Therefore, the final circuit output voltage V3 is the photovoltaic inverter voltage.

[0024] When the photovoltaic inverter is de-energized and the mains power is energized, the NOT gate A2 outputs a low level, the relay K1 is de-energized, the normally open contact does not operate, and there is no voltage output at pins 3 and 6. Meanwhile, the NAND gate B1 outputs a high level, which energizes the coil of the relay K2, causing the normally open contact to operate and close, thus allowing the mains power voltage to be output at pins 3 and 6 of the relay K2.

[0025] When the photovoltaic inverter is powered but the mains power is not, the NOT gate A2 outputs a high level, energizing the relay K1 and causing its normally open contact to close. Pins 3 and 6 output the photovoltaic inverter voltage. Meanwhile, the NAND gate B1 outputs a high level, energizing the coil of the relay K2 and causing its normally open contact to close. However, since there is no mains power, the relay K2 has no output voltage.

[0026] When the inverter power supply and the mains power supply are both de-energized, the NOT gate A2 outputs a low level, the relay K1 is de-energized, the normally open contact does not operate, and there is no voltage output at pins 3 and 6. The NAND gate B1 outputs a high level, which energizes the coil of the relay K2, causing the normally open contact to operate and close. However, since there is no mains power supply, the relay K2 has no output voltage.

[0027] This invention combines mains power and photovoltaic power supply to achieve automatic power switching, ensuring that the outdoor camera can work continuously and will not fail to function properly due to a power outage of one of the power sources.

[0028] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A dual-power supply circuit for an outdoor surveillance camera, characterized in that: It includes a photovoltaic inverter power supply V1 and a mains power supply V2. The photovoltaic inverter power supply V1 is connected to the switching control circuit 1 via a logic judgment circuit 1. The mains power supply V2 is connected to the switching control circuit 2 via a logic judgment circuit 2. The logic judgment circuit 1 is connected to the logic judgment circuit 2. The switching control circuit 1 and the switching control circuit 2 are connected.

2. The dual power supply circuit for an outdoor surveillance camera according to claim 1, characterized in that: The logic judgment circuit one includes an inverter U1. The input terminal of the inverter U1 is connected to the photovoltaic inverter power supply V1. The output terminal of the inverter U1 is connected to pin 1 of the three-terminal voltage regulator U3 and the switching control circuit one. Pin 2 of the three-terminal voltage regulator U3 is grounded. Pin 3 of the three-terminal voltage regulator U3 is connected to pin 1 of NOT gate A1. Pin 2 of NOT gate A1 is connected to pin 1 of NOT gate A2. Pin 2 of NOT gate A2 is connected to the switching control circuit one and the logic judgment circuit two.

3. The dual power supply circuit for an outdoor surveillance camera according to claim 2, characterized in that: The switching control circuit includes a relay K1. The normally open contacts 1 and 4 of the relay K1 are connected to the photovoltaic inverter power supply V1. One end of the coil of the relay K1 is connected to the collector of the transistor T1. The base of the transistor T1 is connected to the 2nd pin of the NOT gate A2 via the resistor R1. The emitter of the transistor T1 is connected to the anode of the diode D1 and grounded. The cathode of the diode D1 is connected to the output terminal of the inverter U1 and the other end of the coil of the relay K1.

4. The dual power supply circuit for an outdoor surveillance camera according to claim 3, characterized in that: The second logic judgment circuit includes an inverter U2. The input terminal of the inverter U2 is connected to the mains power supply V2. The output terminal of the inverter U2 is connected to pin 1 of the three-terminal regulator U4 and the second switching control circuit. Pin 2 of the three-terminal regulator U4 is grounded. Pin 3 of the three-terminal regulator U4 is connected to pin 1 of NOT gate A3. Pin 2 of NOT gate A3 is connected to pin 1 of NOT gate A4. Pin 2 of NOT gate A4 is connected to pin 2 of NAND gate B1. Pin 1 of NAND gate B1 is connected to pin 2 of NOT gate A2. Pin 3 of NAND gate B1 is connected to the second switching control circuit.

5. The dual power supply circuit for an outdoor surveillance camera according to claim 4, characterized in that: The switching control circuit 2 includes relay K2. The normally open contacts 1 and 4 of relay K2 are connected to the mains power supply V2. One end of the coil of relay K2 is connected to the collector of transistor T2. The base of transistor T2 is connected to pin 3 of NAND gate B1 via resistor R2. The emitter of transistor T2 is connected to the anode of diode D2 and grounded. The cathode of diode D2 is connected to the output terminal of inverter U2 and the other end of the coil of relay K2. The normally open contact 3 of relay K2 is connected to the normally open contact 3 of relay K1. The normally open contact 6 of relay K2 is connected to the normally open contact 6 of relay K1 via inductor L.

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