Fire-fighting power supply alarm circuit

Abstract

The utility model discloses a fire-fighting power supply alarm circuit, which comprises a power supply circuit, a terminal, a control circuit, an indicating circuit, an isolating circuit, a switching power supply circuit and a power failure detection circuit, and is characterized in that the power supply circuit is electrically connected with the terminal, the switching power supply circuit and the power failure detection circuit; the terminal is grounded and electrically connected with the control circuit, the indicating circuit, the isolating circuit and the switching power supply circuit, and the control circuit comprises a control chip; the indicating circuit comprises a first resistor, a first light-emitting diode, a second resistor, a second light-emitting diode, a third resistor and a third light-emitting diode, and the first resistor, the second resistor and the third resistor are electrically connected with the first light-emitting diode, the second light-emitting diode, the third light-emitting diode and the control chip respectively. And the first light-emitting diode, the second light-emitting diode and the third light-emitting diode are grounded. The control chip controls the first light-emitting diode, the second light-emitting diode and the third light-emitting diode to carry out light-emitting indication according to a low-level signal of the over-temperature detection module.

Description

Technical Field

[0001] This utility model relates to the field of fire protection power supply, specifically to a fire protection power supply alarm circuit. Background Technology

[0002] The fire protection power supply uses a switching power supply, which connects to the mains power and uses internal transformer and rectifier modules to convert AC power into DC power to supply power to various devices. Typical switching power supplies have overvoltage protection, overcurrent protection, and short-circuit protection functions, and are also equipped with a battery to prevent interruptions in operation.

[0003] Currently, switching power supplies do not have an internal over-temperature detection module. When the switching power supply supplies power to various devices, if the power consumption of the devices is high, it will increase the power supply load of the switching power supply, causing the overall temperature of the switching power supply to rise. Since there is no internal over-temperature detection module, when the switching power supply is too hot, the user cannot detect the internal situation of the switching power supply and cannot deal with it in a timely manner. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a fire power alarm circuit.

[0005] The objective of this utility model is achieved through the following solution:

[0006] A fire alarm power supply circuit includes: a power supply circuit, a terminal block, a control circuit, an indicator circuit, an isolation circuit, a switching power supply circuit, and a power failure detection circuit. The power supply circuit is electrically connected to the terminal block, the switching power supply circuit, and the power failure detection circuit, respectively. The terminal block is electrically connected to the control circuit, the indicator circuit, the isolation circuit, and the switching power supply circuit, and is grounded. The control circuit includes a control chip, an over-temperature detection module, a first protection module, and a first filter module. The control chip is electrically connected to the over-temperature detection module, the first protection module, the first filter module, the terminal block, the indicator circuit, the isolation circuit, the switching power supply circuit, and the power failure detection circuit, respectively. The temperature detection module is electrically connected to the terminal block, and the over-temperature detection module is grounded. The first protection module is electrically connected to the first filter module and the power supply circuit, and the first protection module is grounded. The first filter module is electrically connected to the power supply circuit, and the first filter module is grounded. The indicator circuit includes a first resistor, a first light-emitting diode, a second resistor, a second light-emitting diode, a third resistor, and a third light-emitting diode. The first resistor, the second resistor, and the third resistor are electrically connected to the first light-emitting diode, the second light-emitting diode, the third light-emitting diode, and the control chip, respectively, and the first light-emitting diode, the second light-emitting diode, and the third light-emitting diode are grounded.

[0007] In one embodiment, the power supply circuit includes a second filter module, a transformer module, and a fuse FA. The second filter module is electrically connected to the transformer module, the fuse, and the terminals, and the second filter module is connected to the mains power and grounded. The transformer module is electrically connected to the fuse FA.

[0008] In one embodiment, the isolation circuit includes a first solid-state relay and a second solid-state relay, which are electrically connected to the control chip and the terminal block, respectively.

[0009] In one embodiment, the switching power supply circuit includes a startup module, a voltage regulator module, a switching module, a charging protection module, and a charging module. The startup module is electrically connected to the voltage regulator module, the switching module, the control chip, and the power supply circuit, respectively. The voltage regulator module is electrically connected to the switching module and the control chip, and the voltage regulator module is grounded. The switching module is electrically connected to the charging protection module, the charging module, and the control chip, and the switching module is grounded. The charging protection module is electrically connected to the control chip, and the charging protection module is grounded. The charging module is electrically connected to the control chip, and the charging module is grounded.

[0010] In one embodiment, the startup module includes a rectifier component, a first filter component, a first protection component, a first switch component, and a connection switch. The rectifier component is electrically connected to the first filter component and the control chip, respectively. The first filter component is electrically connected to the first protection component, the first switch component, and the power supply circuit, respectively, and is also connected to the mains power supply and grounded. The first protection component is electrically connected to the first switch component, the connection switch, and the control chip, respectively, and is also grounded. The first switch component is electrically connected to the on / off module.

[0011] In one embodiment, the voltage regulator module includes a second filter component, a second protection component, and a voltage regulator component. The second filter component is electrically connected to the second protection component and the voltage regulator component, respectively, and the second filter component is grounded. The second protection component is electrically connected to the voltage regulator component, the startup module, the on / off module, and the control chip, respectively. The voltage regulator component is grounded.

[0012] In one embodiment, the switching module includes a third filtering component, a third protection component, a first freewheeling component, a second switching component, and a relay. The third filtering component is electrically connected to the third protection component and the starting module, and the third filtering component is grounded. The third protection component is electrically connected to the first freewheeling component, the second switching component, the relay, and the control chip, and the third protection component is grounded. The first freewheeling component is electrically connected to the second switching component and the relay, and the second switching component is electrically connected to the control chip, and the second switching component is grounded.

[0013] In one embodiment, the charging protection module includes a fourth protection component and a third switch component. The fourth protection component is electrically connected to the third switch component, the on / off module, and the control chip, and the fourth protection component is grounded; the third switch component is grounded.

[0014] In one embodiment, the charging module includes a fifth protection component, a second freewheeling component, and a battery. The fifth protection component is electrically connected to the second freewheeling component, the battery, the switching module, and the control chip, and is grounded. The second freewheeling component is electrically connected to the switching module and is grounded. The battery is electrically connected to the terminal block.

[0015] In one embodiment, the power failure detection circuit includes a sixth protection module, a fourth filtering module, and a third optical isolation module. The sixth protection module is electrically connected to the fourth filtering module, the third optical isolation module, and the control chip, respectively, and the sixth protection module is connected to the mains power. The fourth filtering module is electrically connected to the third optical isolation module, and the fourth filtering module is grounded. The third optical isolation module is grounded.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] By setting up an over-temperature detection module, when the power supply load of the switching power supply circuit increases and the temperature of the switching power supply circuit rises, the resistance value of the over-temperature detection module decreases. The control chip electrically connected to the over-temperature detection module will receive a low-level signal, causing the control chip to control the first, second, and third LEDs to light up to indicate the temperature rise of the switching power supply circuit. The user can then detect the abnormality of the switching power supply circuit and take timely action. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a circuit structure diagram of the fire alarm power supply circuit of this utility model;

[0020] In the attached diagram, the reference numerals are: 1. Power supply circuit; 11. Second filter module; 12. Transformer module; 13. Fuse FA1;

[0021] 2. Terminals;

[0022] 3. Control circuit; 31. Control chip; 32. Over-temperature detection module; 33. First protection module; 34. First filtering module;

[0023] 4. Indicator circuit; 41. First resistor; 42. First LED; 43. Second resistor; 44. Second LED; 45. Third resistor; 46. Third LED;

[0024] 5. Isolation circuit; 51. First solid-state relay; 52. Second solid-state relay;

[0025] 6. Switching power supply circuit; 61. Start-up module; 611. Rectifier assembly; 612. First filter assembly; 613. First protection assembly; 614. First switching assembly; 615. Connection switch;

[0026] 62. Voltage regulator module; 621. Second filter component; 622. Second protection component; 623. Voltage regulator component;

[0027] 63. On / off module; 631. Third filter component; 632. Third protection component; 633. First freewheeling component; 634. Second switching component; 635. Relay;

[0028] 64. Charging protection module; 641. Fourth protection component; 642. Third switch component;

[0029] 65. Charging module; 651. Fifth protection component; 652. Second freewheeling component; 653. Battery;

[0030] 7. Power failure detection circuit; 71. Sixth protection module; 72. Fourth filtering module; 73. Third optical isolation module. Detailed Implementation

[0031] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0032] It should be noted that all directional indicators in this utility model embodiment, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0033] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] To further understand the utility model's content, features, and effects, the following embodiments are provided, along with detailed descriptions in conjunction with the accompanying drawings:

[0035] like Figure 1 As shown, a fire alarm circuit includes: a power supply circuit 1, a terminal block 2, a control circuit 3, an indicator circuit 4, an isolation circuit 5, a switching power supply circuit 6, and a power failure detection circuit 7. The power supply circuit 1 and the control circuit 3 are electrically connected through the terminal block 2. The power supply circuit 1 supplies power to the control circuit 3 and the switching power supply circuit 6 through the terminal block. The control circuit 3 controls the operation of the indicator circuit 4, the isolation circuit 5, the switching power supply circuit 6, and the power failure detection circuit 7 through the terminal block. The indicator circuit 4 is used to display the operating status of the fire alarm circuit. The isolation circuit 5 serves as an alarm indicator. The switching power supply circuit 6 is used to supply power to the fire alarm circuit. The power failure detection circuit 7 is used to detect the operating status of the power supply circuit 1.

[0036] Furthermore, such as Figure 1As shown, power supply circuit 1 is electrically connected to terminal 2, switching power supply circuit 6, and power failure detection circuit 7, respectively. Terminal 2 is electrically connected to control circuit 3, indicator circuit 4, isolation circuit 5, and switching power supply circuit 6, and terminal 2 is grounded. Control circuit 3 includes control chip 31, over-temperature detection module 32, first protection module 33, and first filter module 34. Control chip 31 is electrically connected to over-temperature detection module 32, first protection module 33, first filter module 34, terminal 2, indicator circuit 4, isolation circuit 5, switching power supply circuit 6, and power failure detection circuit 7, respectively. Over-temperature detection module 32 is electrically connected to terminal 2 and is grounded. The first protection module... Block 33 is electrically connected to the first filter module 34 and the power supply circuit 1 respectively, and the first protection module 33 is grounded; the first filter module 34 is electrically connected to the power supply circuit 1 respectively, and the first filter module 34 is grounded; the indicator circuit 4 includes a first resistor 41, a first light-emitting diode 42, a second resistor 43, a second light-emitting diode 44, a third resistor 45 and a third light-emitting diode 46, the first resistor 41, the second resistor 43 and the third resistor 45 are electrically connected to the first light-emitting diode 42, the second light-emitting diode 44, the third light-emitting diode 46 and the control chip 31 respectively, and the first light-emitting diode 42, the second light-emitting diode 44 and the third light-emitting diode 45 are grounded respectively.

[0037] Specifically, the control chip 31 has terminals 1-24. The over-temperature detection module 32 includes a resistor NTC1, which has terminals 1 and 2. Terminal 1 of NTC1 is electrically connected to terminal 4 of the control chip 31, and terminal 2 of NTC1 is grounded. The first protection module 33 includes resistors RA8, RA9, R23A, and R34A. The first filtering module 34 includes capacitors CF1, CF2, CF3, CF4, CF5, C17, and CA. Resistors RA8, RA9, R23A, R34A, CF1, CF2, CF3, CF4, CF5, C17, and CA each have terminals 1 and 2. In this embodiment, the control chip is an STC8G1K08.

[0038] Resistors RA8 and RA9 are connected in parallel, with terminal 1 electrically connected to terminal 24 of control chip 31 and terminal 1 of capacitor C17. Terminal 2 is also electrically connected to the power supply circuit. Resistor R23A is electrically connected to power supply circuit 1. Resistor R23A is electrically connected to terminal 1 of resistor R34A, terminal 1 of capacitor CA, and terminal 14 of control chip. Terminal 2 of capacitor R34A is electrically connected to terminal 2 of capacitor CA, and terminal 2 of capacitor R34A is grounded.

[0039] Terminal 1 of capacitor CF1 is electrically connected to terminal 1 of capacitor CF1, and terminal 1 of capacitor CF1 is grounded. Terminal 1 of capacitor CF3 is electrically connected to terminal 8 of the control chip. Terminal 1 of capacitor CF4 is grounded. Terminal 1 of capacitor CF5 is electrically connected to terminal 11 of the control chip. Terminals 2 of capacitors CF1, CF2, CF3, CF4, and CF5 are each electrically connected to terminal 11 of the control chip. Terminal 2 of capacitor C17 is grounded, and terminal 2 of capacitor CA is grounded.

[0040] The first resistor 41, the first light-emitting diode 42, the second resistor 43, the second light-emitting diode 44, the third resistor 45, and the third light-emitting diode 46 each have a terminal 1 and a terminal 2. Terminal 1 of the first resistor 41, the second resistor 43, and the third resistor 45 are electrically connected to terminal 11 of the control chip 31. Terminal 2 of the first resistor 41, the second resistor 43, and the third resistor 45 are electrically connected to terminal 1 of the first light-emitting diode 42, the second light-emitting diode 44, and the third light-emitting diode 46. Terminal 2 of the first light-emitting diode 42, the second light-emitting diode 44, and the third light-emitting diode 46 are grounded.

[0041] It should be noted that resistors RA8, RA9, R23A, R34A, capacitors CF1, CF2, CF3, CF4, CF5, C17, and CA are peripheral components of the control chip 31, used to filter the current input to the control chip 31 and to provide current limiting protection for the control chip 31.

[0042] Among them, resistor NTC1 is a thermistor. When the power consumption of the equipment connected to the switching power supply circuit 1 is large, the load of the switching power supply circuit 1 increases, causing the temperature of the switching power supply to rise. Since resistor NTC1 is a thermistor, the resistance value of resistor NTC1 will gradually decrease in an environment where the temperature gradually increases. Since terminal 2 of resistor NTC1 is grounded, when the resistance value of resistor NTC1 gradually decreases, terminal 4 of control chip 31 will receive a low-level signal. At this time, control chip 31 sends a signal through terminal 11 to control the first light-emitting diode 42, the second light-emitting diode 44, and the third light-emitting diode 46 to illuminate. Users can learn about the fault status of the fire power alarm circuit through the illumination of the first light-emitting diode 42, the second light-emitting diode 44, and the third light-emitting diode 46, so that users can troubleshoot the fire power supply.

[0043] Furthermore, such as Figure 1As shown, the power supply circuit 1 includes a second filter module 11, a transformer module 12, and a fuse FA113. The second filter module 11 is electrically connected to the transformer module 12 and the fuse FA1, respectively. The second filter module 11 is connected to the mains power and grounded. The transformer module is electrically connected to the fuse FA113, and the fuse FA1 is electrically connected to the terminal 2.

[0044] Specifically, the second filter module 11 includes capacitors C22, C23, and C25. Capacitors C22, C23, and C25 each have a terminal 1 and a terminal 2. The transformer module 12 has terminals 1-4. The fuse FA1 has a terminal 1 and a terminal 2. Terminals 1 and 2 of capacitors C22 and C23 are connected in parallel. Terminal 1 of the parallel connection is electrically connected to terminal 1 of transformer module 12, and terminal 2 of the parallel connection is electrically connected to terminal 2 of transformer module 12. Terminal 1 of capacitor C25 is electrically connected to terminal 3 of transformer module 12 and terminal 1 of fuse FA1. Terminal 2 of capacitor C25 is electrically connected to terminal 4 of transformer module 12, and terminal 2 of capacitor C25 is grounded. Terminal 2 of fuse FA1 outputs voltage OP.

[0045] It should be noted that the voltage of the input power supply circuit 1 is a DC pulsating voltage, which is filtered by capacitors C22 and C23, and then the filtered DC pulsating voltage is stepped down and output by the transformer module 12.

[0046] Furthermore, such as Figure 1 As shown, the isolation circuit 5 includes a first solid-state relay 51 and a second solid-state relay 52, which are electrically connected to the control chip 31 and the terminal 2, respectively.

[0047] Specifically, the first solid-state relay 51 has terminals 1-4, and the second solid-state relay 52 has terminals 1-4. Terminals 1 and 2 of the first solid-state relay are electrically connected to terminals 14 and 8 of the control chip 31, respectively. Terminal 1 of the first solid-state relay 51 is electrically connected to terminal 1 of the second solid-state relay 52. ​​Terminals 3 and 4 of the first solid-state relay are electrically connected to terminal 2. Terminal 2 of the second solid-state relay is electrically connected to terminal 6 of the control chip 31. Terminals 3 and 4 of the second solid-state relay 52 are electrically connected to terminal 2, respectively.

[0048] It should be noted that when the fire power alarm circuit is working normally, pin 14 of the control chip 31 outputs a high-level signal, pin 8 of the control chip outputs a low-level signal, the first solid-state relay is turned on, pin 6 of the control chip 31 has no signal output, the second relay is not turned on, indicating that the fire power alarm circuit is working normally.

[0049] When the device connected to the switching power supply circuit 1 has a large power consumption, the load on the switching power supply circuit 1 increases, causing the temperature of the switching power supply to rise. Since resistor NTC1 is a thermistor, the resistance value of resistor NTC1 will gradually decrease as the temperature gradually increases. Since terminal 2 of resistor NTC1 is grounded, when the resistance value of resistor NTC1 gradually decreases, terminal 4 of control chip 31 will receive a low-level signal. Control chip 31 processes the low-level signal, and terminal 2 of control chip 31 stops sending low-level signals. Terminal 6 of control chip 31 sends a low-level signal, which turns on the second solid-state relay 52. ​​The diode inside the first solid-state relay 52 lights up, thereby generating an alarm signal.

[0050] Furthermore, such as Figure 1 As shown, the switching power supply circuit 6 includes a startup module 61, a voltage regulator module 62, a switching module 63, a charging protection module 64, and a charging module 65. The startup module 61 is electrically connected to the voltage regulator module 62, the switching module 63, the control chip 31, and the power supply circuit 1, respectively. The voltage regulator module 62 is electrically connected to the switching module 63 and the control chip 31, and the voltage regulator module 62 is grounded. The switching module 63 is electrically connected to the charging protection module 64, the charging module 65, and the control chip 66, and the switching module 63 is grounded. The charging protection module 64 is electrically connected to the control chip 66, and the charging protection module 64 is grounded. The charging module 65 is electrically connected to the control chip 31, and the charging module 65 is grounded.

[0051] It should be noted that the power supply circuit 1 supplies power to the starting module 61, which controls the on / off switch module 63 to enable the power supply circuit 1 to charge the charging module 65. Simultaneously, it can switch between the power supply circuit 1 and the charging module 65 to select which power supply circuit 1 or the charging module 65 provides power to the switching power supply 6. The voltage regulator module 62 prevents voltage fluctuations in the power supply circuit 1 to the starting module 61, ensuring stable operation of the starting module 61. The charging protection module 64 prevents overcharging of the charging module 65 by the power supply circuit 1, thus preventing damage to the charging module 65.

[0052] Furthermore, such as Figure 1As shown, the startup module 61 includes a rectifier component 611, a first filter component 612, a first protection component 613, a first switch component 614, and a connection switch 615. The rectifier component 611 is electrically connected to the first filter component 612 and the control chip 31, respectively. The first filter component 612 is electrically connected to the first protection component 613, the first switch component 614, and the power supply circuit 1, respectively, and is also connected to the mains power supply and grounded. The first protection component 613 is electrically connected to the first switch component 614, the connection switch 615, and the control chip 31, respectively, and is also grounded. The first switch component 614 is electrically connected to the on / off module 63.

[0053] Specifically, the rectifier assembly 611 includes a diode D14, the first filter assembly 612 includes capacitors C39A, C39B, C4A, and C7A, the first protection assembly 613 includes resistors RA1, RA2, RA3, RA4, RA5, RA6, R0A, R7A, R17A, R12A, R15A, R19A, and R56A, and the first switching assembly 614 includes a MOSFET Q1A. Diode D14, capacitors C39A, C39B, C4A, C7A, resistors RA1, RA2, RA3, RA4, RA5, RA6, R0A, R7A, R17A, R12A, R15A, R19A, and R56A each have terminal 1 and terminal 2. MOSFET Q1A has gate G, source S, and drain D. The connecting switch has terminal 1 and terminal 2.

[0054] Terminal 1 of diode D14 is connected to the mains power. Terminal 2 of diode D14 is electrically connected to terminals 1 of capacitor C39A and C39B. Terminal 2 of capacitor C39A is electrically connected to power supply circuit 1 and terminal 2. Terminal 1 of capacitor C39B is electrically connected to terminals 1 of resistor R56A, RA3, RA4, RA5, and RA6. Terminal 2 of capacitor C39B is electrically connected to the DC pulsating voltage. Terminals 1 of resistors RA3, RA4, RA5, and RA6 are electrically connected to terminal 1 of the connecting switch. Terminals 1 of resistors RA1 and RA2 are electrically connected to terminal 2 of the connecting switch. Terminal 2 of resistor RA3 is electrically connected to the drain D of the MOSFET. Terminal 2 of resistor RA4 is electrically connected to terminal 1 of resistor R0A. Terminal 2 of resistor RA5 is electrically connected to terminals 2 of resistor R12A and 1 of resistor R15A respectively. Terminal 2 of resistor R6A is electrically connected to terminals 2 of resistor RA1, RA2 and capacitor C4A respectively. Terminal 2 of resistor RA1 is electrically connected to terminal 1 of resistor R7A. Terminal 2 of resistor RA2 is electrically connected to terminal 1 of resistor R7A. Terminal 2 of resistor R0A is electrically connected to... Terminal 1 of resistor R17A is electrically connected. Terminal 2 of capacitor C4A is electrically connected to the gate G of the MOSFET, terminal 2 of resistor R7A, and terminal 1 of resistor R12A. Terminal 2 of resistor R7A is electrically connected to terminal 2 of resistor R56A. Terminal 2 of resistor R56A is electrically connected to voltage regulator module 62. Terminal 2 of resistor R17A is electrically connected to terminals 1 of capacitor C7A and resistor R19A respectively. Terminal 1 of capacitor C7A is electrically connected to terminal 1 of resistor R19A. Terminal 2 of capacitor C7A is grounded. Terminal 2 of resistor R19A is electrically connected to control chip 31. Terminal 2 of resistor R12A is electrically connected to terminal 1 of resistor R15A. Terminal 2 of resistor R15A is grounded.

[0055] It should be noted that the mains input diode D12 rectifies the current, and the output smooth DC power is filtered by capacitors C39A and C39B. DC pulsating voltage is also filtered by capacitor C39B to output smooth DC power. The smoothed DC power is amplified by the parallel connection of resistors RA3, RA4, RA5, and RA6 to increase the drive power of MOSFET Q1A. Preferably, when the connection switch is turned on, resistors RA1 and RA2 are connected in parallel with resistors RA3, RA4, RA5, and RA6 to further increase the drive power of MOSFET Q1A. Simultaneously, control chip 31 is connected to resistor R19A to detect the current in the startup module, preventing excessive current from damaging MOSFET Q1A. Resistors R0A, R7A, R12A, R15A, R17A, R19A, and R56A provide current-limiting protection for startup module 61, while capacitors C7A and C4A filter the line current to prevent current noise.

[0056] Furthermore, such as Figure 1 As shown, the voltage regulator module 62 includes a second filter component 621, a second protection component 622, and a voltage regulator component 623. The second filter component 621 is electrically connected to the second protection component 622 and the voltage regulator component 623, respectively, and the second filter component 621 is grounded. The second protection component 622 is electrically connected to the voltage regulator component 623, the start-up module 61, the on / off module 63, and the control chip 31, respectively. The voltage regulator component 623 is grounded.

[0057] Specifically, the second filter component 621 includes capacitors C40A and C12A; the second protection component 622 includes resistors R57A, R25A, R60A, R59A, R63A, and R62A; and the voltage regulator component 623 includes a Zener diode U5. Capacitors C40A and C12A, resistors R57A, R25A, R60A, R59A, R63A, and R62A each have terminal 1 and terminal 2. The Zener diode U5 has terminals 1-3. Terminal 1 of capacitor C40A is electrically connected to terminal 1 of Zener diode U5 and terminal 2 of resistor R57A. Terminal 2 of capacitor C40A is electrically connected to terminal 1 of resistor R60A. Terminal 1 of resistor R57A is electrically connected to startup module 61. Terminal 2 of resistor R60A is electrically connected to terminal 2 of resistor R25A, terminal 1 of resistor R61A, and terminal 3 of Zener diode U5. Terminal 1 of resistor R25A is electrically connected to startup module 61 and switching module 63. Connect the second terminal of resistor R61A to the first terminal of resistor R63A, the first terminal of capacitor C12A, and the first terminal of resistor R62A. Connect the first terminal of resistor R63A to the first terminal of capacitor C12A and the first terminal of resistor R62A. Connect the second terminal of resistor R63A to the 19th terminal of control chip 31. Connect the second terminals of resistor R59A, capacitor C12A, and resistor R62A to ground.

[0058] It should be noted that when Zener diode U5 experiences a large reverse voltage and undergoes reverse breakdown, the current flowing through Zener diode U2 increases sharply because the reverse voltage exceeds its own breakdown voltage. The voltages at terminals 1 and 3 of Zener diode U5 remain unchanged, thus ensuring a stable voltage between the start-up module 61 and the switching module 63, allowing the start-up module 61 to operate more stably. Capacitor C40A smooths the voltages at terminals 1 and 3 of Zener diode U5, reducing noise interference in the connection lines. Capacitor C12A filters the signal input to the control chip 31, making the control chip 31's current detection and regulation of the voltage regulator module more precise. Resistors R57A, R25A, R60A, R59A, R63A, and R62A provide current-limiting protection for the voltage regulator module 62.

[0059] Furthermore, such as Figure 1As shown, the switching module 63 includes a third filter component 631, a third protection component 632, a first freewheeling component 633, a second switch component 634, and a relay 635. The third filter component 631 is electrically connected to the third protection component 632 and the starting module 61, and the third filter component 631 is grounded. The third protection component 632 is electrically connected to the first freewheeling component 633, the second switch component 634, the relay 635, and the control chip 31, and the third protection component 632 is grounded. The first freewheeling component 633 is electrically connected to the second switch component 634 and the relay 635, respectively. The second switch component 634 is electrically connected to the control chip 31, and the second switch component 634 is grounded.

[0060] Specifically, the third filter component 631 includes a capacitor C41A, the third protection component 632 includes resistors R18A, R49A, R48A and R13A, the first freewheeling component 633 includes diodes DB2 and D3A, and the second switching component 634 includes a MOSFET Q4A. Capacitor C41A, resistors R18A, R49A, R48A, and R13A, diodes DB2 and D3A each have a terminal 1 and a terminal 2. MOSFET Q4A has a gate (G), source (S), and drain (D). Terminal 1 of capacitor C41A is electrically connected to terminals 1 of resistors R18A and R49A, the startup module 61, and the switching module. Terminal 1 of resistor R18A is electrically connected to terminal 1 of resistor R49A. Terminal 1 of resistor R49A is electrically connected to terminal 1 of diode DB2, relay 635, and the charging protection module 64. Terminal 2 of capacitor C41A is electrically connected to terminal 2 of resistor R18A. Each resistor is grounded. Terminal 2 of resistor R49A is electrically connected to terminal 1 of resistor R48A and terminal 11 of control chip 31. Terminal 2 of resistor R48A is grounded. Terminal 1 of diode DB2 is electrically connected to relay 635 and charging protection module 64. Terminal 2 of diode DB2 is electrically connected to terminal 2 of diode D3A and power supply circuit 1. Terminal 2 of diode D3A is electrically connected to relay and drain D of MOSFET Q4A. Terminal 1 of resistor R13A is electrically connected to terminal 7 of control chip 31. Terminal 2 of resistor R13A is electrically connected to gate of MOSFET Q4A. Source S of MOSFET Q4A is grounded.

[0061] It should be noted that when MOSFET Q1A is turned on, relay 635 closes, and the output voltage of startup module 61 charges charging module 65, while switching power supply circuit 6 operates normally. When the AC power in startup module 61 is cut off, MOSFET Q1A will turn off, causing relay to change from closed to open. This causes pin 7 of control chip 31 to turn on MOSFET Q4A, closing relay 635 and supplying power to charging module 65. The power supply from charging module 65 ensures the normal operation of switching power supply circuit 1. Specifically, pin 11 of control chip 31 outputs a level signal to control the on / off state of MOSFET Q1A. Capacitor C41A is used for circuit filtering. Resistors R18A, R49A, R48A, and R13A provide current limiting protection. Diode DB2 prevents reverse current from flowing into the power supply circuit, and diode D3A prevents the reverse electromotive force of the relay from damaging MOSFET Q4A.

[0062] Furthermore, such as Figure 1 As shown, the charging protection module 64 includes a fourth protection component 641 and a third switch component 642. The fourth protection component 641 is electrically connected to the third switch component 642, the on / off module 63 and the control chip 31 respectively, and the fourth protection component 641 is grounded; the third switch component 642 is grounded.

[0063] Specifically, the fourth protection component 641 includes resistors RB1, RB2, RB3, RB4, R44A, and R45A, and the third switching component 642 includes a MOSFET Q7A. Resistors RB1, RB2, RB3, RB4, R44A, and R45A each have a terminal 1 and a terminal 2, and the MOSFET Q7A has a gate G, a source S, and a drain D. Resistors RB1, RB2, RB3, and RB4 are connected in parallel at terminals 1 and 2 respectively. Terminal 1 of the parallel connection is electrically connected to the on / off module 63, and terminal 2 of the parallel connection is electrically connected to the drain D of MOSFET Q7A respectively. Resistor R44A is connected in parallel at terminal 1 to terminal 5 of control chip 31. Resistor R44A is connected in parallel at terminal 1 of resistor R45A and the gate G of MOSFET Q7A respectively. Resistor R45A is connected in parallel at terminal 2 to the source of MOSFET Q7A, and both are grounded.

[0064] Among them, resistors RB1, RB2, RB3, RB4, R44A and R45A are used as current-limiting resistors to protect the circuit. After the MOSFET Q7A is turned on, since the source S of the MOSFET Q7A is grounded, the voltage of the charging protection module 64 is directly pulled down, thereby providing overcharge protection for the charging module 65.

[0065] Furthermore, such as Figure 1As shown, the charging module 65 includes a fifth protection component 651, a second freewheeling component 652, and a battery 653. The fifth protection component 651 is electrically connected to the second freewheeling component 652, the battery 653, the switching module 63, and the control chip 31, respectively, and the fifth protection component 651 is grounded; the second freewheeling component 652 is electrically connected to the switching module 63, and the second freewheeling component 652 is grounded.

[0066] Specifically, the fifth protection component 651 includes resistors R50A and R35A, and fuse FA2. The second freewheeling component 652 includes diode DB1. Resistors R50A, R35A, fuse FA2, and diode DB1 each have a terminal 1 and a terminal 2. Terminal 1 of resistor R50A is electrically connected to terminal 1 of diode DB1, terminal 1 of fuse FA2, and the switching module 63. Terminal 2 of resistor R50A is electrically connected to terminal 1 of resistor R35A and terminal 1 of control chip 31. Terminal 2 of resistor R35A is electrically connected to terminal 2 of diode DB1 and is also grounded. Terminal 1 of diode DB1 is electrically connected to terminal 1 of fuse FA2, and terminal 2 of fuse FA2 is electrically connected to battery 653. Resistors R50A, R35A, and fuse FA2 provide current limiting protection for charging module 65, and diode DB1 ensures that current from battery 653 flows into relay 635.

[0067] It should be noted that pin 1 of the control chip 31 can detect the charging status of the battery 653. When the battery 653 is fully charged, in order to prevent the battery 653 from being overcharged, pin 5 of the control chip 31 sends a control signal to control the MOSFET Q7A to conduct, so that the voltage of the relay 653 is directly pulled down, thereby preventing the battery 653 from being over-voltage and avoiding overcharging.

[0068] Furthermore, such as Figure 1 As shown, the power failure detection circuit 7 includes a sixth protection module 71, a fourth filtering module 72, and a third optical isolation module 73. The sixth protection module 71 is electrically connected to the fourth filtering module 72, the third optical isolation module 73, and the control chip 31, respectively, and the sixth protection module 71 is connected to the mains power. The fourth filtering module 72 is electrically connected to the third optical isolation module 73, and the fourth filtering module 72 is grounded. The third optical isolation module is grounded 73.

[0069] Specifically, the sixth protection module 71 includes resistors R3, R8A, and R25A; the fourth filtering module includes capacitor CA9; and the third optical isolation module 73 includes optocoupler U3. Resistors R3, R8A, R25A, and capacitor CA9 each have terminals 1 and 2, and optocoupler U3 has terminals 1-4. Terminals 1 of resistors R3 and R8A are electrically connected to the mains power. Terminal 2 of resistor R3 is electrically connected to terminal 1 of optocoupler U3. Terminal 2 of resistor R8A is electrically connected to terminal 2 of optocoupler U3. Terminal 1 of resistor R25A is electrically connected to terminal 2. Terminal 2 of resistor R25A is electrically connected to terminal 1 of capacitor CA9, terminal 4 of optocoupler U3, and terminal 22 of the control chip, respectively. Terminal 2 of capacitor CA9 is electrically connected to terminal 3 of optocoupler U3 and grounded.

[0070] It should be noted that since optocoupler U3 is electrically connected to the mains power, when the mains power is interrupted, the LED inside optocoupler U3 turns off, and the voltage level at pin 4 of optocoupler U3 decreases. Pins 18 and 22 of control chip 31 detect this decrease in voltage level through pin 4 of optocoupler U3, determining that there is no mains power input. The control chip then controls the MOSFET Q1A to turn on, causing the relay to close and continue supplying power to the switching power supply circuit 6 through battery 653. Resistors R3, R8A, and R25A are used for current limiting protection of optocoupler U3, and capacitor CA9 reduces interference in the signal input from optocoupler U3 to control chip 31, ensuring more stable operation of control chip 31.

[0071] In summary, in the specific implementation of this utility model, the DC pulsating voltage is input to the power supply circuit 1, and at the same time, the DC pulsating voltage is input to the switching power supply circuit 6. The power supply circuit 1 filters and reduces the DC pulsating voltage. In this embodiment, the voltage input from the power supply circuit 1 to the terminal 2 through the transformer module 12 is 27V, and the control chip 31 is powered through the terminal 2.

[0072] If the device connected to the switching power supply circuit 1 has a large power consumption, the load on the switching power supply circuit 1 will increase, causing the temperature of the switching power supply to rise. Since resistor NTC1 is a thermistor, the resistance value of resistor NTC1 will gradually decrease as the temperature gradually increases. Since terminal 2 of resistor NTC1 is grounded, when the resistance value of resistor NTC1 gradually decreases, terminal 4 of control chip 31 will receive a low-level signal. At this time, control chip 31 sends a signal through terminal 11 to control the first light-emitting diode 42, the second light-emitting diode 44, and the third light-emitting diode 46 to illuminate. Users can learn about the fault status of the fire power alarm circuit through the illumination of the first light-emitting diode 42, the second light-emitting diode 44, and the third light-emitting diode 46, so that users can troubleshoot the fire power supply.

[0073] In this embodiment, the first LED 42 is green, the second LED 44 is orange, and the third LED 46 is yellow. When the DC pulsating voltage is input to the switching power supply circuit 6 and the control chip 31 starts working, the green LED 42 is constantly lit, the orange LED 44 flashes rapidly, and the yellow LED 46 flashes slowly, indicating that the fire alarm power supply circuit is working normally.

[0074] When the device connected to the switching power supply circuit 1 has a large power consumption, the load on the switching power supply circuit 1 increases, causing the temperature of the switching power supply circuit 1 to rise. Since the resistor NTC1 is a thermistor, the resistance value of the thermistor will gradually decrease as the temperature gradually increases. Since terminal 2 of the resistor NTC1 is grounded, when the resistance value of the resistor NTC1 gradually decreases, the control chip 31 receives a low-level signal. The control chip 31 then controls the first LED 42 to keep the green light on, the second LED 44 to flash the orange light rapidly five times, and the third LED 46 to flash the yellow light slowly. Thus, the user can know that the internal temperature of the switching power supply circuit 6 has increased.

[0075] Thus, by setting resistor NTC1, based on the characteristics of resistor NTC1 as a thermistor, when the power supply load of the switching power supply circuit 6 increases, the temperature of the switching power supply circuit 6 rises, the resistance value of resistor NTC1 decreases, and the control chip 31, which is electrically connected to resistor NTC1, will receive a low-level signal, causing the control chip 31 to control the first light-emitting diode 42, the second light-emitting diode 44, and the third light-emitting diode to light up for indication. The user can know that the temperature of the switching power supply circuit 6 has risen based on the light-emitting signals of the first light-emitting diode 42, the second light-emitting diode 44, and the third light-emitting diode.

[0076] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A fire power alarm circuit, characterized by, include: The circuit includes a power supply circuit (1), a terminal block (2), a control circuit (3), an indicator circuit (4), an isolation circuit (5), a switching power supply circuit (6), and a power failure detection circuit (7). The power supply circuit (1) is electrically connected to the terminal block (2), the switching power supply circuit (6), and the power failure detection circuit (7). The terminal block (2) is electrically connected to the control circuit (3), the indicator circuit (4), the isolation circuit (5), and the switching power supply circuit (6), and the terminal block (2) is grounded. The control circuit (3) includes a control chip (31), an over-temperature detection module (32), a first protection module (33), and a first filter module (34). The control chip (31) is electrically connected to the over-temperature detection module (32), the first protection module (33), the first filter module (34), the terminal block (2), the indicator circuit (4), the isolation circuit (5), the switching power supply circuit (6), and the power failure detection circuit (7), and the over-temperature detection module (32) is electrically connected to the control circuit (31), the indicator circuit (4), the isolation circuit (5), the switching power supply circuit (6), and the power failure detection circuit (7), and the power failure detection circuit (7). The first protection module (33) is electrically connected to the terminal (2), and the over-temperature detection module (32) is grounded. The first protection module (33) is electrically connected to the first filter module (34) and the power supply circuit (1), and the first protection module (33) is grounded. The first filter module (34) is electrically connected to the power supply circuit (1), and the first filter module (34) is grounded. The indicator circuit (4) includes a first resistor (41), a first light-emitting diode (42), a second resistor (43), a second light-emitting diode (44), a third resistor (45), and a third light-emitting diode (46). The first resistor (41), the second resistor (43), and the third resistor (45) are electrically connected to the first light-emitting diode (42), the second light-emitting diode (44), the third light-emitting diode (46), and the control chip (31), and the first light-emitting diode (42), the second light-emitting diode (44), and the third light-emitting diode (46) are grounded.

2. The fire pump alarm circuit of claim 1, wherein, The power supply circuit (1) includes a second filter module (11), a transformer module (12) and a fuse FA1 (13). The second filter module (11) is electrically connected to the transformer module (12), the fuse (13) and the terminal (2) respectively. The second filter module (11) is connected to the mains power and grounded, and the transformer module is electrically connected to the fuse FA1 (13).

3. The fire pump alarm circuit of claim 1, wherein, The isolation circuit (5) includes a first solid-state relay (51) and a second solid-state relay (52), which are electrically connected to the control chip (31) and the terminal (2), respectively.

4. The fire pump alarm circuit of claim 1, wherein, The switching power supply circuit (6) includes a startup module (61), a voltage regulator module (62), a switching module (63), a charging protection module (64), and a charging module (65). The startup module (61) is electrically connected to the voltage regulator module (62), the switching module (63), the control chip (31), and the power supply circuit (1), respectively. The voltage regulator module (62) is electrically connected to the switching module (63) and the control chip (31), and the voltage regulator module (62) is grounded. The switching module (63) is electrically connected to the charging protection module (64), the charging module (65), and the control chip (31), respectively, and the switching module (63) is grounded. The charging protection module (64) is electrically connected to the control chip (31), and the charging protection module (64) is grounded. The charging module (65) is electrically connected to the control chip (31), and the charging module (65) is grounded.

5. The fire pump alarm circuit of claim 4, wherein, The startup module (61) includes a rectifier component (611), a first filter component (612), a first protection component (613), a first switch component (614), and a connection switch (615). The rectifier component (611) is electrically connected to the first filter component (612) and the control chip (31), respectively. The first filter component (612) is electrically connected to the first protection component (613), the first switch component (614), and the power supply circuit (1), respectively. The first filter component (612) is connected to the mains power and is also grounded. The first protection component (613) is electrically connected to the first switch component (614), the connection switch (615), and the control chip (31), respectively. The first protection component (613) is grounded. The first switch component (614) is electrically connected to the switching module (63).

6. The fire pump alarm circuit of claim 4, wherein, The voltage regulator module (62) includes a second filter component (621), a second protection component (622), and a voltage regulator component (623). The second filter component (621) is electrically connected to the second protection component (622) and the voltage regulator component (623), and the second filter component (621) is grounded. The second protection component (622) is electrically connected to the voltage regulator component (623), the start-up module (61), the on / off module (63), and the control chip (31), respectively. The voltage regulator component (623) is grounded.

7. The fire pump alarm circuit of claim 1, wherein, The switching module (63) includes a third filter component (631), a third protection component (632), a first freewheeling component (633), a second switch component (634), and a relay (635). The third filter component (631) is electrically connected to the third protection component (632) and the starting module (61), and the third filter component (631) is grounded. The third protection component (632) is electrically connected to the first freewheeling component (633), the second switch component (634), the relay (635), and the control chip (31), and the third protection component (632) is grounded. The first freewheeling component (633) is electrically connected to the second switch component (634) and the relay (635), and the second switch component (634) is electrically connected to the control chip (31), and the second switch component (634) is grounded.

8. The fire pump alarm circuit of claim 1, wherein, The charging protection module (64) includes a fourth protection component (641) and a third switch component (642). The fourth protection component (641) is electrically connected to the third switch component (642), the on / off module (63), and the control chip (31), and the fourth protection component (641) is grounded; the third switch component (642) is grounded.

9. The fire pump alarm circuit of claim 1, wherein, The charging module (65) includes a fifth protection component (651), a second freewheeling component (652), and a battery (653). The fifth protection component (651) is electrically connected to the second freewheeling component (652), the battery (653), the switching module (63), and the control chip (31), and the fifth protection component (651) is grounded. The second freewheeling component (652) is electrically connected to the switching module (63), and the second freewheeling component (652) is grounded. The battery (653) is electrically connected to the terminal block.

10. The fire pump alarm circuit of claim 1, wherein, The power failure detection circuit (7) includes a sixth protection module (71), a fourth filter module (72) and a third optical isolation module (73). The sixth protection module (71) is electrically connected to the fourth filter module (72), the third optical isolation module (73) and the control chip (31), and the sixth protection module (71) is connected to the mains power. The fourth filter module (72) is electrically connected to the third optical isolation module (73), and the fourth filter module (72) is grounded. The third optical isolation module (73) is grounded.

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