High-efficiency switch constant-current LED lamp circuit with emergency lighting function
By setting up an electronic switch in the emergency detection circuit and controlling its conduction or turn-off according to the state of charging of the battery, the problem of low luminous efficiency when the battery is fully charged in the prior art is solved, and efficient emergency lighting function is realized.
Patent Information
- Application Number
- CN202422038438.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-08-22
AI Technical Summary
In the normal lighting state, when the battery is fully charged, the DC current output from the constant current driving power supply generates heat through the voltage limiting circuit, resulting in low luminous efficiency.
An electronic switch is set between the charging input terminal and the negative electrode of the emergency detection circuit. By detecting whether the battery is fully charged, the cut-off or short-circuit state of the electronic switch is controlled to ensure that the voltage between the positive output terminal and the negative output terminal of the constant current driving power supply is equal to the voltage between the positive and negative electrode of the LED light emitting circuit, and avoid unnecessary power consumption.
Under normal lighting conditions, when the battery is fully charged, the adverse luminous efficiency is avoided and the luminous efficiency is maintained.
Smart Images
Figure CN223246740U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an LED lamp circuit with an emergency lighting function, in particular to a high-efficiency switch constant-current LED lamp circuit with the emergency lighting function. Background Art
[0002] like Figure 1As shown, the currently commonly used LED lamp circuit with emergency lighting function has normal lighting state and emergency lighting state, and usually includes a constant current drive power supply, an LED light-emitting circuit, a battery, a voltage limiting circuit, a boost conversion circuit, an emergency detection circuit and an anti-reverse diode. The constant current drive power supply has a live wire input terminal, a neutral wire input terminal, a positive output terminal and a negative output terminal. The constant current drive power supply is used to convert the AC voltage of the mains connected to its live wire input terminal and neutral wire input terminal into a DC current and output it between its positive output terminal and negative output terminal. The LED light-emitting circuit has a positive pole and a negative pole. When a DC current is connected between its positive pole and negative pole, the LED light-emitting circuit emits light; the battery has a positive pole and a negative pole; the voltage The limiting circuit has a positive pole and a negative pole. When current passes through the positive pole and the negative pole, a corresponding voltage is generated between the positive pole and the negative pole, and this voltage is greater than or equal to the voltage between the positive pole and the negative pole of the battery; the emergency detection circuit has a first detection terminal, a second detection terminal, a charging input terminal, a battery connection terminal, a control terminal and a negative pole. The anti-reverse diode is a rectifier diode, which is used to prevent reverse current shock and avoid affecting the reliability of the emergency detection circuit; the boost conversion circuit has a positive pole, a negative pole, an enable terminal and an output terminal. When the enable terminal of the boost conversion circuit is connected to a high-level signal, the boost conversion circuit boosts the voltage connected between its positive pole and negative pole and outputs the corresponding DC current at its output terminal. The positive electrode of the battery, the positive electrode of the boost converter circuit, and the battery connection terminal of the emergency detection circuit are connected; the charging input terminal of the emergency detection circuit, the positive electrode of the voltage limiting circuit, and the negative electrode of the LED light-emitting circuit are connected; the positive electrode of the LED light-emitting circuit, the output terminal of the boost converter circuit, and the positive output terminal of the constant current drive power supply are connected; the negative electrode of the battery, the negative electrode of the voltage limiting circuit, the negative electrode of the emergency detection circuit, the negative electrode of the boost converter circuit, and the positive electrode of the anti-reverse diode are connected; the negative electrode of the anti-reverse diode is connected to the negative output terminal of the constant current drive power supply; the first detection terminal of the emergency detection circuit is connected to the live wire input terminal of the constant current drive power supply; the second detection terminal of the emergency detection circuit is connected to the neutral wire input terminal of the constant current drive power supply; and the enable terminal of the boost converter circuit is connected to the control terminal of the emergency detection circuit. The emergency detection circuit is used to control the LED light circuit with emergency lighting function to enter a normal lighting state when the constant current drive power supply is normally connected to the AC mains voltage, and to control the LED light circuit with emergency lighting function to enter an emergency lighting state when the AC mains voltage connected to the constant current drive power supply is abnormally disconnected. When the LED lamp circuit with emergency lighting function is in normal lighting state, the constant current driving power supply supplies power to the LED light-emitting circuit to make it emit light. The emergency detection circuit charges the battery when the battery is not fully charged, and stops charging the battery when the battery is fully charged. When the LED lamp circuit with emergency lighting function is in emergency lighting state, the emergency detection circuit controls the boost conversion circuit to use battery power to supply power to the LED light-emitting circuit to make it emit light.
[0003] When the mains power is normal, when the mains AC voltage is connected between the live wire input terminal and the neutral wire input terminal of the constant current driving power supply, the emergency detection circuit detects the mains AC voltage and outputs a low-level signal at its control terminal to stop the boost conversion circuit from working. At this time, the LED lamp circuit with emergency lighting function enters the normal lighting state, and the constant current driving power supply outputs a DC current between its positive output terminal and the negative output terminal. This DC current drives the LED light-emitting circuit to emit light, thereby achieving normal lighting. At the same time, this DC current generates a voltage between the positive and negative poles of the voltage limiting circuit. When the LED lamp circuit with emergency lighting function is in the normal lighting state, if the battery is not fully charged, the charging input terminal of the emergency detection current and its battery connection terminal are connected, and the voltage generated between the positive and negative poles of the voltage limiting circuit is used to charge the battery. At this time, the voltage output between the positive output terminal and the negative output terminal of the constant current drive power supply is the sum of the voltage between the positive and negative poles of the LED light-emitting circuit and the voltage between the positive and negative poles of the battery; if the battery is fully charged, the charging input terminal of the emergency detection current and its battery connection terminal are disconnected. At this time, the voltage output between the positive output terminal and the negative output terminal of the constant current drive power supply is the sum of the voltage between the positive and negative poles of the LED light-emitting circuit and the voltage between the positive and negative poles of the voltage limiting circuit.
[0004] When the mains power is abnormally cut off, the emergency detection circuit will detect that there is no voltage input between the live wire input terminal and the neutral wire input terminal of the constant current drive power supply, and on the other hand, it will detect that the external switch set between the LED lamp circuit with emergency lighting function and the external mains power is in a closed state. At this time, the control end of the emergency detection circuit outputs a high-level signal, the boost conversion circuit works, and the battery power is used to drive the LED light-emitting circuit to emit light, thereby realizing emergency lighting.
[0005] When the above-mentioned LED lamp circuit with emergency lighting circuit is in normal lighting state and the battery is fully charged, the DC current output by the constant current driving power supply not only drives the LED light-emitting circuit to emit light, but also passes through the voltage limiting circuit, that is, there will be power consumption and heat generated in the voltage limiting circuit, which will have an adverse effect on the luminous efficiency and result in low luminous efficiency. Summary of the Invention
[0006] The technical problem to be solved by the utility model is to provide a high-efficiency switching constant-current LED lamp circuit with emergency lighting function, which does not cause adverse effects on luminous efficiency in normal lighting state and when the battery is fully charged, and still has high luminous efficiency.
[0007] The technical solution adopted by the utility model to solve the above technical problems is: a high-efficiency switching constant current LED lamp circuit with emergency lighting function, which has normal lighting state and emergency lighting state, including a constant current driving power supply, an LED lighting circuit, a battery, a boost conversion circuit, an emergency detection circuit and an anti-reverse diode. The constant current driving power supply is a switching power supply type constant current driving power supply, which has a live wire input terminal, a neutral wire input terminal, a positive output terminal and a negative output terminal. The LED light-emitting circuit has a positive pole and a negative pole, the battery has a positive pole and a negative pole, the emergency detection circuit has a first detection end, a second detection end, a charging input end, a battery connection end, a control end and a negative pole, the anti-reverse diode is a rectifier diode, the boost conversion circuit has a positive pole, a negative pole, an enable end and an output end, the positive pole of the battery, the positive pole of the boost conversion circuit and the battery connection end of the emergency detection circuit are connected, the charging input end of the emergency detection circuit and the negative pole of the LED light-emitting circuit are connected, the positive pole of the LED light-emitting circuit, the output end of the boost conversion circuit and the positive output end of the constant current drive power supply are connected, the negative pole of the battery, the The negative electrode of the emergency detection circuit, the negative electrode of the boost conversion circuit and the positive electrode of the anti-reverse diode are connected, the negative electrode of the anti-reverse diode is connected to the negative output end of the constant current drive power supply, the first detection end of the emergency detection circuit is connected to the live wire input end of the constant current drive power supply, the second detection end of the emergency detection circuit is connected to the zero line input end of the constant current drive power supply, the enable end of the boost conversion circuit is connected to the control end of the emergency detection circuit, and the emergency detection circuit has an electronic switch arranged between its charging input end and the negative electrode. When the battery is charged, the electronic switch is turned off, and when the battery stops charging, the electronic switch is short-circuited.
[0008] The high-efficiency switch constant current LED lamp circuit with emergency lighting function also includes a mode setting circuit, which has a first end and a second end. The first end of the mode setting circuit is connected to the first detection end of the emergency detection circuit, and the second end of the mode setting circuit is connected to the second detection end of the emergency detection circuit. The mode setting circuit is used to set two emergency lighting status start-up modes, one is a switch start-up mode, which is used to enable the high-efficiency switch constant current LED lamp circuit with emergency lighting function to enter the emergency lighting state when the external switch set between the high-efficiency switch constant current LED lamp circuit with emergency lighting function and the external mains power is in a closed state and the constant current driving power supply is not connected to the voltage; the other is a power-off start-up mode, which is used to enable the high-efficiency switch constant current LED lamp circuit with emergency lighting function to enter the emergency lighting state when the constant current driving power supply has no voltage connected.
[0009] The mode setting circuit includes a switch, a first resistor, a first diode, and a second diode. The first diode and the second diode are both voltage-stabilizing diodes. One end of the first resistor is the first end of the mode setting circuit, the other end of the first resistor and the cathode of the first diode are connected to one end of the switch, the anode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is connected to the other end of the switch, and the connection end is the other end of the mode setting circuit. When the switch is in a closed state, its two ends are connected, and the mode setting circuit is set to a power-off startup mode. When the switch is in an open state, its two ends are disconnected, and the mode setting circuit is set to a switch startup mode.
[0010] The emergency detection circuit also has a positive pole, the positive pole of the emergency detection circuit is connected to the positive output end of the constant current drive power supply, the emergency detection circuit includes a second resistor, a third resistor, a fourth resistor, a first capacitor, a third diode and a first integrated circuit of model BP5428, the third diode is a rectifier diode, one end of the second resistor is the first detection end of the emergency detection circuit, the other end of the second resistor is connected to the AC1 pin of the first integrated circuit, one end of the third resistor is the second detection end of the emergency detection circuit, the other end of the third resistor is connected to the AC2 pin of the first integrated circuit, one end of the fourth resistor is the positive pole of the emergency detection circuit, and the other end of the fourth resistor is connected to the VD pin of the first integrated circuit. The D pin is connected, the anode of the third diode is connected to the CS pin of the first integrated circuit, and its connection end is the charging input end of the emergency detection circuit, the cathode of the third diode is connected to the DCH pin of the first integrated circuit, the CTL pin of the first integrated circuit is the control end of the emergency detection circuit, the BP pin of the first integrated circuit is connected to one end of the first capacitor, and its connection end is the battery connection end of the emergency detection circuit, the other end of the first capacitor is connected to the GND pin of the first integrated circuit, and its connection end is the negative electrode of the emergency detection circuit, and the MOS tube circuit structure between the CS pin and the GND pin of the first integrated circuit serves as an electronic switch arranged between the charging input end and the battery connection end of the emergency detection circuit.
[0011] The boost conversion circuit includes a second integrated circuit of model QW2023, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fourth diode and an inductor. The fourth diode is a rectifier diode. The EN pin of the second integrated circuit is the enable terminal of the boost conversion circuit. One end of the inductor, the VDD pin of the second integrated circuit and one end of the second capacitor are connected, and the connection end is the positive electrode of the boost conversion circuit. The other end of the inductor, the positive electrode of the fourth diode and the SW pin of the second integrated circuit are connected. The negative electrode of the fourth diode, one end of the eighth resistor and one end of the fourth capacitor are connected, and the connection end is the boost. The output end of the conversion circuit, the other end of the eighth resistor, and one end of the ninth resistor are connected to the FB pin of the second integrated circuit, one end of the sixth resistor and one end of the seventh resistor are connected to the CS pin of the second integrated circuit, one end of the fifth resistor is connected to the RT pin of the second integrated circuit, one end of the third capacitor is connected to the COMP pin of the second integrated circuit, the other end of the second capacitor, the other end of the third capacitor, the other end of the fourth capacitor, the other end of the fifth resistor, the other end of the sixth resistor, the other end of the seventh resistor, and the other end of the ninth resistor are connected to the GND pin of the second integrated circuit, and their connection ends are the negative electrode of the boost conversion circuit.
[0012] Compared with the prior art, the advantage of the present invention is that by setting an electronic switch between the charging input terminal and the negative pole of the emergency detection circuit, when the mains AC voltage is connected between the live input terminal and the neutral input terminal of the constant current driving power supply when the mains AC voltage is normal, the emergency detection circuit will detect the mains AC voltage and output a low-level signal at its control terminal to stop the boost conversion circuit from working. At this time, the LED lamp circuit with emergency lighting function enters the normal lighting state, and the constant current driving power supply outputs a DC current between its positive output terminal and the negative output terminal. This DC current drives the LED light-emitting circuit to emit light, realizing normal lighting. During the normal lighting process If the battery is not fully charged, the electronic switch inside the emergency detection circuit is cut off, and the emergency detection current uses the DC current output between the positive output terminal and the negative output terminal of the constant current drive power supply to charge the battery. If the battery is fully charged, the emergency detection current stops charging the battery, and at the same time, the electronic switch inside the emergency detection current is short-circuited. At this time, the voltage between the positive output terminal and the negative output terminal of the constant current drive power supply is equal to the voltage between the positive and negative poles of the LED light-emitting circuit. Therefore, the utility model will not have an adverse effect on the luminous efficiency in the normal lighting state and when the battery is fully charged, and still has a high luminous efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the structure of a commonly used LED lamp circuit with emergency lighting function;
[0014] Figure 2 This is a schematic diagram of the structure of a high-efficiency switching constant-current LED lamp circuit with emergency lighting function of the present utility model;
[0015] Figure 3 This is a circuit diagram of a high-efficiency switching constant-current LED lamp circuit with emergency lighting function in the present utility model. DETAILED DESCRIPTION
[0016] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0017] Example 1: Figure 2 As shown, a high-efficiency switching constant-current LED lamp circuit with emergency lighting function has normal lighting state and emergency lighting state, including a constant-current drive power supply, an LED light-emitting circuit, a battery BT, a boost conversion circuit, an emergency detection circuit and an anti-reverse diode D. The constant-current drive power supply is a switching power supply type constant-current drive power supply, having a live wire input terminal, a neutral wire input terminal, a positive output terminal and a negative output terminal. The LED light-emitting circuit has a positive electrode and a negative electrode. The battery BT has a positive electrode and a negative electrode. The emergency detection circuit has a first detection terminal, a second detection terminal, a charging input terminal, a battery connection terminal, a control terminal and a negative electrode. The anti-reverse diode D is a rectifier diode. The boost conversion circuit has a positive electrode, a negative electrode, an enable terminal and an output terminal. The positive electrode of the battery BT, the positive electrode of the boost conversion circuit and the battery connection terminal of the emergency detection circuit are connected. The charging input terminal of the emergency detection circuit and the negative electrode of the LED light-emitting circuit are connected. The positive electrode of the LED light-emitting circuit, the output terminal of the boost conversion circuit and the positive output terminal of the constant-current drive power supply are connected. The negative electrode of the battery BT , the negative electrode of the emergency detection circuit, the negative electrode of the boost conversion circuit and the positive electrode of the anti-reverse diode D are connected, the negative electrode of the anti-reverse diode D is connected to the negative output end of the constant current drive power supply, the first detection end of the emergency detection circuit is connected to the live wire input end of the constant current drive power supply, the second detection end of the emergency detection circuit is connected to the neutral wire input end of the constant current drive power supply, the enable end of the boost conversion circuit is connected to the control end of the emergency detection circuit, and the emergency detection circuit has an electronic switch arranged between its charging input end and the negative electrode. When the battery BT is charged, the electronic switch is cut off. When the battery BT stops charging, the electronic switch is short-circuited.
[0018] In this embodiment, an electronic switch is set between the charging input terminal of the emergency detection circuit and the battery connection terminal. When the mains power is abnormally cut off, the emergency detection circuit will detect that there is no voltage input between the live wire input terminal and the neutral wire input terminal of the constant current driving power supply, and on the other hand, it will detect that the external switch set between the LED lamp circuit with emergency lighting function and the external mains power is in a closed state. At this time, the control terminal of the emergency detection circuit outputs a high-level signal, the boost conversion circuit works, and the electric energy of the battery BT is used to drive the LED light-emitting circuit to emit light, thereby realizing emergency lighting; when the mains power is normal, when the mains AC voltage is connected between the live wire input terminal and the neutral wire input terminal of the constant current driving power supply, the emergency detection circuit will detect the mains AC voltage, and output a low-level signal at its control terminal to make the boost conversion circuit not work. At this time, the LED lamp circuit with emergency lighting function enters In the normal lighting state, the constant current driving power supply outputs a DC current between its positive output terminal and the negative output terminal. This DC current drives the LED light-emitting circuit to emit light, thereby achieving normal lighting. During the normal lighting process, if the battery BT is not fully charged, the electronic switch inside the emergency detection circuit is cut off, and the emergency detection current uses the DC current output between the positive output terminal and the negative output terminal of the constant current driving power supply to charge the battery BT. If the battery BT is fully charged, the emergency detection current stops charging the battery BT, and at the same time, the electronic switch inside the emergency detection current is short-circuited. At this time, the voltage between the positive output terminal and the negative output terminal of the constant current driving power supply is equal to the voltage between the positive and negative poles of the LED light-emitting circuit. Therefore, the utility model will not have an adverse effect on the luminous efficiency in the normal lighting state and when the battery BT is fully charged, and still has a high luminous efficiency.
[0019] Example 2: This example is basically the same as Example 1, with the difference that: in this example, the high-efficiency switch constant current LED lamp circuit with emergency lighting function also includes a mode setting circuit, the mode setting circuit has a first end and a second end, the first end of the mode setting circuit is connected to the first detection end of the emergency detection circuit, and the second end of the mode setting circuit is connected to the second detection end of the emergency detection circuit. The mode setting circuit is used to set two emergency lighting status start-up modes, one is a switch start-up mode, which is used to enable the high-efficiency switch constant current LED lamp circuit with emergency lighting function to enter the emergency lighting state when the external switch set between the high-efficiency switch constant current LED lamp circuit with emergency lighting function and the external AC power is in a closed state and the constant current driving power supply is not connected to the voltage; the other is a power-off start-up mode, which is used to enable the high-efficiency switch constant current LED lamp circuit with emergency lighting function to enter the emergency lighting state when the constant current driving power supply has no voltage connected.
[0020] In this embodiment, when the mode setting circuit is set in the switch start mode, if the emergency detection circuit detects that there is no voltage input between the live wire input terminal and the neutral wire input terminal of the constant current driving power supply, and the external switch set between the high-efficiency switch constant current LED lamp circuit with emergency lighting function and the external mains is in a closed state, at this time, the control end of the emergency detection circuit outputs a high-level signal, so that the high-efficiency switch constant current LED lamp circuit with emergency lighting function enters the emergency lighting state, and the boost conversion circuit drives the LED light-emitting circuit to emit light after using the electric energy of the battery BT for conversion; if the emergency detection circuit detects that there is no voltage input between the live wire input terminal and the neutral wire input terminal of the constant current driving power supply, and the emergency When the external switch set between the high-efficiency switch constant current LED lamp circuit with lighting function and the external AC power is in the disconnected state, the control end of the emergency detection circuit outputs a low-level signal, the boost conversion circuit does not work, there is no current output at its output end, and the LED light-emitting circuit does not emit light; when the mode setting circuit is set in the power-off start mode, if the emergency detection circuit detects that there is no voltage input between the live wire input end and the neutral wire input end of the constant current drive power supply, the control end of the emergency detection circuit outputs a high-level signal, so that the high-efficiency switch constant current LED lamp circuit with emergency lighting function enters the emergency lighting state, and the boost conversion circuit converts the voltage of the battery BT into a DC current to drive the LED light-emitting circuit to emit light.
[0021] Example 3: This example is basically the same as Example 2, except that: in this example, Figure 3 As shown, the mode setting circuit includes a switch SW1, a first resistor R1, a first diode D1, and a second diode D2. The first diode D1 and the second diode D2 are both voltage-stabilizing diodes. One end of the first resistor R1 is a first end of the mode setting circuit. The other end of the first resistor R1 and the cathode of the first diode D1 are connected to one end of the switch SW1. The anode of the first diode D1 and the anode of the second diode D2 are connected. The cathode of the second diode D2 is connected to the other end of the switch SW1, and the connection end is the other end of the mode setting circuit. When the switch SW1 is in a closed state, the two ends are connected, and the mode setting circuit is set to a power-off startup mode. When the switch SW1 is in an open state, the two ends are disconnected, and the mode setting circuit is set to a switch startup mode.
[0022] Example 4: This example is basically the same as Example 2, except that: in this example, Figure 3As shown, the emergency detection circuit also has a positive electrode, the positive electrode of the emergency detection circuit is connected to the positive output end of the constant current drive power supply, the emergency detection circuit includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a third diode D3 and a first integrated circuit U1 of model BP5428, the third diode D3 is a rectifier diode, one end of the second resistor R2 is the first detection end of the emergency detection circuit, the other end of the second resistor R2 is connected to the AC1 pin of the first integrated circuit U1, one end of the third resistor R3 is the second detection end of the emergency detection circuit, the other end of the third resistor R3 is connected to the AC2 pin of the first integrated circuit U1, one end of the fourth resistor R4 is the positive electrode of the emergency detection circuit, and the other end of the fourth resistor R4 is connected to the first integrated circuit U 1, the anode of the third diode D3 is connected to the CS pin of the first integrated circuit U1, and the connection end thereof is the charging input end of the emergency detection circuit, the cathode of the third diode D3 is connected to the DCH pin of the first integrated circuit U1, the CTL pin of the first integrated circuit U1 is the control end of the emergency detection circuit, the BP pin of the first integrated circuit U1 is connected to one end of the first capacitor C1, and the connection end thereof is the battery connection end of the emergency detection circuit, the other end of the first capacitor C1 is connected to the GND pin of the first integrated circuit U1, and the connection end thereof is the negative electrode of the emergency detection circuit, and the MOS tube circuit structure between the CS pin and the GND pin of the first integrated circuit U1 serves as an electronic switch arranged between the charging input end and the battery connection end of the emergency detection circuit.
[0023] Example 5: This example is basically the same as Example 2, except that: in this example, Figure 3As shown, the boost conversion circuit includes a second integrated circuit U2 of model QW2023, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fourth diode D4 and an inductor L1, the fourth diode D4 is a rectifier diode, the EN pin of the second integrated circuit U2 is the enable terminal of the boost conversion circuit, one end of the inductor L1, the VDD pin of the second integrated circuit U2 and one end of the second capacitor C2 are connected, and the connection end is the positive electrode of the boost conversion circuit, the other end of the inductor L1, the positive electrode of the fourth diode D4 and the SW pin of the second integrated circuit U2 are connected, the negative electrode of the fourth diode D4, one end of the eighth resistor R8 and one end of the fourth capacitor C4 are connected. The first and second ends of the eighth resistor R8 and the ninth resistor R9 are connected to the FB pin of the second integrated circuit U2, the other end of the sixth resistor R6 and the first end of the seventh resistor R7 are connected to the CS pin of the second integrated circuit U2, the first end of the fifth resistor R5 is connected to the RT pin of the second integrated circuit U2, the first end of the third capacitor C3 is connected to the COMP pin of the second integrated circuit U2, the other end of the second capacitor C2, the other end of the third capacitor C3, the other end of the fourth capacitor C4, the other end of the fifth resistor R5, the other end of the sixth resistor R6, the other end of the seventh resistor R7, and the other end of the ninth resistor R9 are connected to the GND pin of the second integrated circuit U2, and the connection end thereof is the negative electrode of the boost converter circuit.
[0024] To sum up, the high-efficiency switching constant-current LED lamp circuit with emergency lighting function of the present invention sets an electronic switch between the charging input terminal of the emergency detection circuit and the battery connection terminal, and in the normal lighting state, the electronic switch is in the cut-off or on state according to whether the battery is charging, so that when the battery BT is fully charged, the voltage between the positive output terminal and the negative output terminal of the constant-current driving power supply is equal to the voltage between the positive and negative poles of the LED light-emitting circuit. Therefore, in the normal lighting state and when the battery is fully charged, it will not cause adverse effects on the luminous efficiency and still has high luminous efficiency.
Claims
1. A high-efficiency switching constant-current LED lamp circuit with emergency lighting function, which has normal lighting state and emergency lighting state, including a constant-current drive power supply, an LED light-emitting circuit, a battery, a boost converter circuit, an emergency detection circuit and an anti-reverse diode. The constant-current drive power supply is a switching power supply type constant-current drive power supply, having a live wire input terminal, a neutral wire input terminal, a positive output terminal and a negative output terminal. The LED light-emitting circuit has a positive electrode and a negative electrode. The battery has a positive electrode and a negative electrode. The emergency detection circuit has a first detection terminal, a second detection terminal, a charging input terminal, a battery connection terminal, a control terminal and a negative electrode. The anti-reverse diode is a rectifier diode. The boost converter circuit has a positive electrode, a negative electrode, an enable terminal and an output terminal. The positive electrode of the battery, the positive electrode of the boost converter circuit and the battery connection terminal of the emergency detection circuit are connected. The charging input terminal of the emergency detection circuit and the negative electrode of the LED light-emitting circuit are connected. The output end of the circuit is connected to the positive output end of the constant current drive power supply, the negative electrode of the battery, the negative electrode of the emergency detection circuit, the negative electrode of the boost conversion circuit and the positive electrode of the anti-reverse diode are connected, the negative electrode of the anti-reverse diode is connected to the negative output end of the constant current drive power supply, the first detection end of the emergency detection circuit is connected to the live wire input end of the constant current drive power supply, the second detection end of the emergency detection circuit is connected to the zero wire input end of the constant current drive power supply, and the enable end of the boost conversion circuit is connected to the control end of the emergency detection circuit, characterized in that: The emergency detection circuit has an electronic switch arranged between its charging input terminal and the negative electrode. When the battery is charged, the electronic switch is turned off. When the battery stops charging, the electronic switch is short-circuited.
2. A high-efficiency switching constant current LED lamp circuit with emergency lighting function according to claim 1, characterized in that It also includes a mode setting circuit, which has a first end and a second end. The first end of the mode setting circuit is connected to the first detection end of the emergency detection circuit, and the second end of the mode setting circuit is connected to the second detection end of the emergency detection circuit. The mode setting circuit is used to set two emergency lighting status start-up modes, one of which is a switch start-up mode, which is used to enable the high-efficiency switch constant current LED lamp circuit with emergency lighting function to enter the emergency lighting state when the external switch set between the high-efficiency switch constant current LED lamp circuit with emergency lighting function and the external mains is in a closed state and the constant current driving power supply is not connected to the voltage; the other is a power-off start-up mode, which is used to enable the high-efficiency switch constant current LED lamp circuit with emergency lighting function to enter the emergency lighting state when the constant current driving power supply has no voltage connected.
3. A high-efficiency switching constant current LED lamp circuit with emergency lighting function according to claim 2, characterized in that The mode setting circuit includes a switch, a first resistor, a first diode, and a second diode. The first diode and the second diode are both voltage-stabilizing diodes. One end of the first resistor is the first end of the mode setting circuit, the other end of the first resistor and the cathode of the first diode are connected to one end of the switch, the anode of the first diode is connected to the anode of the second diode, and the cathode of the second diode is connected to the other end of the switch, and the connection end is the other end of the mode setting circuit. When the switch is in a closed state, its two ends are connected, and the mode setting circuit is set to a power-off startup mode. When the switch is in an open state, its two ends are disconnected, and the mode setting circuit is set to a switch startup mode.
4. The high-efficiency switching constant current LED lamp circuit with emergency lighting function according to claim 2 is characterized in that The emergency detection circuit also has a positive pole, the positive pole of the emergency detection circuit is connected to the positive output end of the constant current drive power supply, the emergency detection circuit includes a second resistor, a third resistor, a fourth resistor, a first capacitor, a third diode and a first integrated circuit of model BP5428, the third diode is a rectifier diode, one end of the second resistor is the first detection end of the emergency detection circuit, the other end of the second resistor is connected to the AC1 pin of the first integrated circuit, one end of the third resistor is the second detection end of the emergency detection circuit, the other end of the third resistor is connected to the AC2 pin of the first integrated circuit, one end of the fourth resistor is the positive pole of the emergency detection circuit, and the other end of the fourth resistor is connected to the VD pin of the first integrated circuit. The D pin is connected, the anode of the third diode is connected to the CS pin of the first integrated circuit, and its connection end is the charging input end of the emergency detection circuit, the cathode of the third diode is connected to the DCH pin of the first integrated circuit, the CTL pin of the first integrated circuit is the control end of the emergency detection circuit, the BP pin of the first integrated circuit is connected to one end of the first capacitor, and its connection end is the battery connection end of the emergency detection circuit, the other end of the first capacitor is connected to the GND pin of the first integrated circuit, and its connection end is the negative electrode of the emergency detection circuit, and the MOS tube circuit structure between the CS pin and the GND pin of the first integrated circuit serves as an electronic switch arranged between the charging input end and the battery connection end of the emergency detection circuit.
5. The high-efficiency switching constant current LED lamp circuit with emergency lighting function according to claim 2 is characterized in that The boost conversion circuit includes a second integrated circuit of model QW2023, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fourth diode and an inductor. The fourth diode is a rectifier diode. The EN pin of the second integrated circuit is the enable terminal of the boost conversion circuit. One end of the inductor, the VDD pin of the second integrated circuit and one end of the second capacitor are connected, and the connection end is the positive electrode of the boost conversion circuit. The other end of the inductor, the positive electrode of the fourth diode and the SW pin of the second integrated circuit are connected. The negative electrode of the fourth diode, one end of the eighth resistor and one end of the fourth capacitor are connected, and the connection end is the boost. The output end of the conversion circuit, the other end of the eighth resistor, and one end of the ninth resistor are connected to the FB pin of the second integrated circuit, one end of the sixth resistor and one end of the seventh resistor are connected to the CS pin of the second integrated circuit, one end of the fifth resistor is connected to the RT pin of the second integrated circuit, one end of the third capacitor is connected to the COMP pin of the second integrated circuit, the other end of the second capacitor, the other end of the third capacitor, the other end of the fourth capacitor, the other end of the fifth resistor, the other end of the sixth resistor, the other end of the seventh resistor, and the other end of the ninth resistor are connected to the GND pin of the second integrated circuit, and their connection ends are the negative electrode of the boost conversion circuit.