Fire-fighting emergency base station power supply
By using a dual MOS transistor structure and a switching control module for monitoring and control, the problems of energy loss and slow switching speed in existing dual power supply switching technologies are solved, achieving efficient and stable power switching, which is suitable for fire emergency base station power supplies.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 翁杨华
- Filing Date
- 2025-04-01
- Publication Date
- 2026-05-01
AI Technical Summary
Existing dual-power switching solutions suffer from problems such as high energy loss, severe heat generation, slow switching speed, easy wear and tear on mechanical structures, short lifespan, and complex switching control, making it impossible to achieve efficient dual-power switching.
It adopts a dual MOSFET structure, and monitors and controls the status of the main power supply and the backup power supply through a switching control module. Combined with an RCD absorption unit, a bidirectional suppression diode and an input filter capacitor, it realizes the functions of input and output blocking, soft start and reverse connection protection. The electrical parameters are set through the main and backup power supply threshold setting modules to achieve efficient power switching control.
It achieves efficient dual power supply switching, reduces energy loss, improves switching speed and system stability, avoids current backflow and low battery power restart issues, and has the feature of main power supply priority.
Smart Images
Figure CN224191680U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power management technology, and in particular to a power supply for a fire emergency base station. Background Technology
[0002] Traditional dual-power switching solutions often employ diodes or relays to achieve high-power primary / backup power switching. In diode solutions, significant energy loss occurs due to the large forward voltage drop, resulting in substantial efficiency losses, especially in low-voltage equipment, while causing severe heat generation in high-current equipment. Furthermore, when both power supplies are operating simultaneously, the higher voltage source becomes the primary power source, contradicting the goal of using an adapter as the primary power source. Relays suffer from large size, slow switching speed, and susceptibility to mechanical wear and short lifespan. MOSFET solutions struggle to address issues such as switching time control, current backflow, the impact of uncertain voltage differences between the two power supplies, and voltage rebound after low battery protection leading to continuous system restarts, requiring additional complex logic circuitry for control. Therefore, existing solutions cannot achieve efficient dual-power switching. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a fire emergency base station power supply that enables efficient dual power supply switching.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0005] A fire emergency base station power supply includes a switching control module, a main power input module, and a backup power input module. Both the main power input module and the backup power input module include dual MOSFETs. A first power input terminal of the switching control module is connected to the power input terminal of the main power input module, which is used to connect to a first power source. A first monitoring terminal of the switching control module is connected to the source of the main power input module. A first control terminal of the switching control module is connected to the gate of the main power input module. A second power input terminal of the switching control module is connected to the power input terminal of the backup power input module, which is used to connect to a second power source. A second monitoring terminal of the switching control module is connected to the source of the backup power input module. A second control terminal of the switching control module is connected to the gate of the backup power input module.
[0006] Furthermore, the main power input module includes a first MOSFET, a second MOSFET, and an RCD absorption unit; the drain of the first MOSFET is connected to a first power supply; the drain of the second MOSFET is connected to the first terminal of the RCD absorption unit and the power output terminal of the switching control module, respectively; the sources of the first MOSFET and the second MOSFET are both connected to the first monitoring terminal of the switching control module; the gates of the first MOSFET and the second MOSFET are both connected to the second terminal of the RCD absorption unit; and the third terminal of the RCD absorption unit is connected to the first control terminal of the switching control module.
[0007] Furthermore, the main power input module also includes a bidirectional suppression diode and an input filter capacitor; the positive terminal of the bidirectional suppression diode is connected to one end of the input filter capacitor and the drain of the first MOSFET respectively; the negative terminal of the bidirectional suppression diode is connected to the other end of the input filter capacitor and grounded.
[0008] Furthermore, it also includes a main power threshold setting module and a backup power threshold setting module; the input terminal of the main power threshold setting module is used to connect to a first power source; the output terminal of the main power threshold setting module is connected to the main power setting input terminal of the switching control module; the input terminal of the backup power threshold setting module is used to connect to a second power source; the output terminal of the backup power threshold setting module is connected to the backup power setting input terminal of the switching control module.
[0009] Furthermore, the main power supply threshold setting module includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; the main power supply setting input terminal includes an undervoltage threshold pin, an overvoltage threshold pin, and a hysteresis pin; one end of the first resistor is connected to the first power supply, and the other end of the first resistor is connected to one end of the second resistor and one end of the fourth resistor respectively; the other end of the fourth resistor is connected to the undervoltage threshold pin; the other end of the second resistor is connected to one end of the third resistor and the overvoltage threshold pin respectively; the other end of the third resistor is grounded; one end of the fifth resistor is connected to the hysteresis pin, and the other end is grounded.
[0010] Furthermore, it also includes a power on / off module; the input terminal of the power on / off module is used to receive a power on / off signal; the output terminal of the power on / off module is connected to the power on / off input terminal of the switching control module.
[0011] Furthermore, the power-on / off module includes a third MOSFET, a switch interface, a sixth resistor, a seventh resistor, and an eighth resistor; the input terminal of the switch interface is used to connect to a switch button; the output terminal of the switch interface is connected to one end of the sixth resistor and one end of the seventh resistor, respectively; the other end of the sixth resistor is connected to the gate of the third MOSFET; the other end of the seventh resistor is used to connect to a reference voltage; one end of the eighth resistor is connected to the drain of the third MOSFET, and the other end is connected to the switch input terminal of the switching control module; the source of the third MOSFET is grounded.
[0012] Furthermore, the power-on / off module also includes a transient suppression diode and a first capacitor; the anode of the transient suppression diode is connected to the output terminal of the switch interface and one end of the first capacitor, respectively; the cathode of the transient suppression diode is connected to the other end of the first capacitor and the source of the third MOSFET, respectively.
[0013] Furthermore, it also includes an output filtering module; the output filtering module is connected to the power supply output terminal of the switching control module.
[0014] Furthermore, the output filtering module includes at least one electrolytic capacitor; the positive terminal of the electrolytic capacitor is connected to the power supply output terminal of the switching control module, and the negative terminal is grounded.
[0015] The beneficial effects of this utility model are as follows: it realizes input and output blocking, input soft start, and reverse connection protection functions through dual MOSFETs; and by connecting the first monitoring terminal and the second detection terminal of the switching control module to the source of the main power input module and the source of the backup power input module respectively, and connecting the first control terminal and the second control terminal of the switching control module to the gate of the main power input module and the gate of the backup power input module respectively, the switching control module can monitor the external first / second power supply status, and output corresponding control logic based on the monitored status to control the switching status of the dual MOSFETs in the main power input module and the backup power input module, thereby achieving efficient dual power supply switching control. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a fire emergency base station power supply module in an embodiment of this utility model;
[0017] Figure 2 This is a schematic diagram of another module of a fire emergency base station power supply in an embodiment of this utility model;
[0018] Figure 3 This is a circuit diagram of a fire emergency base station power supply according to an embodiment of the present utility model;
[0019] Figure 4This is a schematic diagram of the main power input module circuit of a fire emergency base station power supply in an embodiment of this utility model;
[0020] Figure 5 This is a schematic diagram of a switching control module for a fire emergency base station power supply and its peripheral circuit, as described in an embodiment of this utility model.
[0021] Figure 6 This is a schematic diagram of the power-on module circuit of a fire emergency base station power supply according to an embodiment of this utility model;
[0022] Figure 7 This is a schematic diagram of the output filtering module circuit of a fire emergency base station power supply in an embodiment of this utility model;
[0023] Label Explanation:
[0024] 1. Switching control module; 2. Main power input module; 3. Backup power input module; 4. Main power threshold setting module; 5. Backup power threshold setting module; 6. Power on / off module; 7. Output filtering module;
[0025] U1, First MOSFET; U2, Second MOSFET; D1, Bidirectional Suppressor Diode; R3, First Resistor; R7, Second Resistor; R9, Third Resistor; R5, Fourth Resistor; R11, Fifth Resistor; Q3, Third MOSFET; JP1, Switch Interface; R14, Sixth Resistor; R13, Seventh Resistor; R12, Eighth Resistor; D5, Transient Suppressor Diode; C13, First Capacitor. Detailed Implementation
[0026] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.
[0027] A fire emergency base station power supply includes a switching control module, a main power input module, and a backup power input module. Both the main power input module and the backup power input module include dual MOSFETs. A first power input terminal of the switching control module is connected to the power input terminal of the main power input module, which is used to connect to a first power source. A first monitoring terminal of the switching control module is connected to the source of the main power input module. A first control terminal of the switching control module is connected to the gate of the main power input module. A second power input terminal of the switching control module is connected to the power input terminal of the backup power input module, which is used to connect to a second power source. A second monitoring terminal of the switching control module is connected to the source of the backup power input module. A second control terminal of the switching control module is connected to the gate of the backup power input module.
[0028] As described above, the beneficial effects of this utility model are as follows: It achieves input and output blocking, input soft-start, and reverse connection protection functions through dual MOSFETs; and by connecting the first monitoring terminal and the second detection terminal of the switching control module to the source of the main power input module and the source of the backup power input module respectively, and connecting the first control terminal and the second control terminal of the switching control module to the gate of the main power input module and the gate of the backup power input module respectively, the switching control module monitors the external first / second power supply status and outputs corresponding control logic based on the monitored status to control the switching status of the dual MOSFETs in the main power input module and the backup power input module, thereby achieving efficient dual power supply switching control.
[0029] Furthermore, the main power input module includes a first MOSFET, a second MOSFET, and an RCD absorption unit; the drain of the first MOSFET is connected to a first power supply; the drain of the second MOSFET is connected to the first terminal of the RCD absorption unit and the power output terminal of the switching control module, respectively; the sources of the first MOSFET and the second MOSFET are both connected to the first monitoring terminal of the switching control module; the gates of the first MOSFET and the second MOSFET are both connected to the second terminal of the RCD absorption unit; and the third terminal of the RCD absorption unit is connected to the first control terminal of the switching control module.
[0030] As described above, a dual MOSFET structure is formed by the first MOSFET and the second MOSFET to achieve input and output blocking, input soft start, and reverse connection protection. The RCD circuit is used to adjust the soft start and fast turn-off times of the MOSFETs.
[0031] Furthermore, the main power input module also includes a bidirectional suppression diode and an input filter capacitor; the positive terminal of the bidirectional suppression diode is connected to one end of the input filter capacitor and the drain of the first MOSFET respectively; the negative terminal of the bidirectional suppression diode is connected to the other end of the input filter capacitor and grounded.
[0032] As described above, by setting a bidirectional suppression diode, the input surge overshoot voltage can be suppressed, and by setting an input filter capacitor, the impurities and noise of the power input can be filtered out.
[0033] Furthermore, it also includes a main power threshold setting module and a backup power threshold setting module; the input terminal of the main power threshold setting module is used to connect to a first power source; the output terminal of the main power threshold setting module is connected to the main power setting input terminal of the switching control module; the input terminal of the backup power threshold setting module is used to connect to a second power source; the output terminal of the backup power threshold setting module is connected to the backup power setting input terminal of the switching control module.
[0034] As described above, by setting the main power supply threshold setting module and the backup power supply threshold setting module, the electrical parameters related to the main power supply and the backup power supply can be set, so that the switching control module can more effectively control the main power supply and the backup power supply according to the set electrical parameter thresholds.
[0035] Furthermore, the main power supply threshold setting module includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; the main power supply setting input terminal includes an undervoltage threshold pin, an overvoltage threshold pin, and a hysteresis pin; one end of the first resistor is connected to the first power supply, and the other end of the first resistor is connected to one end of the second resistor and one end of the fourth resistor respectively; the other end of the fourth resistor is connected to the undervoltage threshold pin; the other end of the second resistor is connected to one end of the third resistor and the overvoltage threshold pin respectively; the other end of the third resistor is grounded; one end of the fifth resistor is connected to the hysteresis pin, and the other end is grounded.
[0036] As described above, the first, second, and third resistors act as voltage divider resistors. The voltage at the voltage divider point between the first and second resistors is used to set the undervoltage threshold of the input power supply, and the voltage at the voltage divider point between the second and third resistors is used to set the overvoltage threshold of the input power supply, thereby determining the threshold window of the main power supply voltage. At the same time, the fourth and fifth resistors act as hysteresis resistors, which determine the hysteresis value of the upper limit of the input power supply voltage, and the fourth and fifth resistors, together with the first resistor, determine the hysteresis value of the lower limit of the input power supply voltage.
[0037] Furthermore, it also includes a power on / off module; the input terminal of the power on / off module is used to receive a power on / off signal; the output terminal of the power on / off module is connected to the power on / off input terminal of the switching control module.
[0038] As can be seen from the above description, by setting up a power on / off module, the power on / off control of the switching control module can be effectively achieved.
[0039] Furthermore, the power-on / off module includes a third MOSFET, a switch interface, a sixth resistor, a seventh resistor, and an eighth resistor; the input terminal of the switch interface is used to connect to a switch button; the output terminal of the switch interface is connected to one end of the sixth resistor and one end of the seventh resistor, respectively; the other end of the sixth resistor is connected to the gate of the third MOSFET; the other end of the seventh resistor is used to connect to a reference voltage; one end of the eighth resistor is connected to the drain of the third MOSFET, and the other end is connected to the switch input terminal of the switching control module; the source of the third MOSFET is grounded.
[0040] As described above, the signal inversion function is achieved by using the third MOSFET, the sixth resistor, the seventh resistor, and the eighth resistor. When the external switch is closed, the drain of the third MOSFET outputs a high level, which controls the system to turn on. When the external switch is opened, the drain of the third MOSFET outputs a low level, which controls the system to turn off.
[0041] Furthermore, the power-on / off module also includes a transient suppression diode and a first capacitor; the anode of the transient suppression diode is connected to the output terminal of the switch interface and one end of the first capacitor, respectively; the cathode of the transient suppression diode is connected to the other end of the first capacitor and the source of the third MOSFET, respectively.
[0042] As can be seen from the above description, the transient suppression diode can provide electrostatic protection for the external interface, and the first capacitor can filter out the jitter signal generated when the external switch is activated.
[0043] Furthermore, it also includes an output filtering module; the output filtering module is connected to the power supply output terminal of the switching control module.
[0044] As can be seen from the above description, by setting an output filter module at the power supply output terminal of the switching control module, the output of the system power supply circuit can be filtered, thus stabilizing the dynamic fluctuations of the power supply.
[0045] Furthermore, the output filtering module includes at least one electrolytic capacitor; the positive terminal of the electrolytic capacitor is connected to the power supply output terminal of the switching control module, and the negative terminal is grounded.
[0046] As described above, by using electrolytic capacitors as the output filter module, the energy storage function of the capacitors supports the seamless switching process of the dual power supplies, thus limiting the power drop to within the allowable range.
[0047] The fire emergency base station power supply provided by this utility model can be applied to scenarios such as 4G / 5G fire emergency base stations and portable devices. The following is a detailed description of the implementation method:
[0048] Example 1
[0049] Please refer to Figures 1-3 A fire emergency base station power supply includes a switching control module 1, a main power input module 2, and a backup power input module 3. Both the main power input module 2 and the backup power input module 3 include dual MOSFETs. The first power input terminal (V1) of the switching control module 1 is connected to the power input terminal of the main power input module 2, which is used to connect to a first power source. The first monitoring terminal (VS1) of the switching control module 1 is connected to the source of the main power input module 2. The first control terminal (G1) of the switching control module 1 is connected to the gate of the main power input module 2. The second power input terminal (V2) of the switching control module 1 is connected to the power input terminal of the backup power input module 3, which is used to connect to a second power source. The second monitoring terminal (VS2) of the switching control module 1 is connected to the source of the backup power input module 3. The second control terminal (G2) of the switching control module 1 is connected to the gate of the backup power input module 3.
[0050] Please refer to Figure 2 It also includes a main power threshold setting module 4, a backup power threshold setting module 5, a power on / off module 6, and an output filtering module 7. The input terminal of the main power threshold setting module 4 is connected to the first power supply; the output terminal of the main power threshold setting module 4 is connected to the main power setting input terminal of the switching control module 1. The input terminal of the backup power threshold setting module 5 is connected to the second power supply; the output terminal of the backup power threshold setting module 5 is connected to the backup power setting input terminal of the switching control module 1. The input terminal of the power on / off module 6 is used to receive switching signals; the output terminal of the power on / off module 6 is connected to the switching input terminal of the switching control module 1 to implement switching control. The output filtering module 7 is connected to the power supply output terminal of the switching control module 1.
[0051] Please refer to Figure 3 as well as Figure 4The main power input module 2 includes a first MOSFET U1, a second MOSFET U2, an RCD snubber unit, a bidirectional suppressor diode D1, and an input filter capacitor. The drain of the first MOSFET U1 is connected to a first power supply (VADP), such as an external adapter power supply. The drain of the second MOSFET U2 is connected to the first terminal of the RCD snubber unit and the power output terminal (VOUT) of the switching control module 1. The sources of both the first MOSFET U1 and the second MOSFET U2 are connected to the first monitoring terminal of the switching control module 1. The gates of both the first MOSFET U1 and the second MOSFET U2 are connected to the second terminal of the RCD snubber unit. The third terminal of the RCD snubber unit is connected to the first control terminal of the switching control module 1. The RCD snubber unit includes a resistor R1, a capacitor C5, and a diode D3. The anode of the bidirectional suppressor diode D1 is connected to one end of the input filter capacitor and the drain of the first MOSFET U1. The cathode of the bidirectional suppressor diode D1 is connected to the other end of the input filter capacitor and grounded. Figure 4 As shown, the input filter capacitor consists of capacitors C1 and C2 connected in parallel. Figure 3 As shown, the backup power input module 3 and the main power input module 2 use the same circuit structure; the second power source is a battery.
[0052] Please refer to Figure 5 The switching control module 1 includes a management chip U5, model LTC4418; a filter unit consisting of capacitors C7, C8 and C12; and a TMR capacitor C11. The management chip is used to monitor the status of the external main / backup input power supply and output power supply, power on / off status, etc., and makes logical judgments to decide the on / off state of the MOSFETs in the main power input module 2 and the backup power input module 3. Taking the connection with the main power input module 2 as an example, the source of the dual MOSFETs of the main power input module 2 is connected to pins 14 and 12 of the management chip U5, which is used to control the drive level of pins 13 and 11, thereby controlling the on / off state of the dual MOSFETs. Capacitors C7 and C8 filter noise and stabilize the voltage for the power supply to pins 14 and 12. Capacitor C12 filters and stabilizes the internal output power supply INTVcc at pin 10. The TMR capacitor C11 is used to set the TMR (time mode reciprocal) time. If the voltage of the main power supply or backup power supply remains within the threshold window within the TMR time range, the main power supply or backup power supply is considered to be in a usable state.
[0053] The main power supply threshold setting module 4 includes a first resistor R3, a second resistor R7, a third resistor R9, a fourth resistor R5, and a fifth resistor R11. The main power supply setting input includes undervoltage threshold pins (UV1, UV2), overvoltage threshold pins (OV1, OV2), and a hysteresis pin (HYS). One end of the first resistor R3 is connected to the first power supply, and the other end is connected to one end of the second resistor R7 and one end of the fourth resistor R5. The other end of the fourth resistor R5 is connected to the undervoltage threshold pin. The other end of the second resistor R7 is connected to one end of the third resistor R9 and one end of the overvoltage threshold pin. The other end of the third resistor R9 is grounded. One end of the fifth resistor R11 is connected to the hysteresis pin, and the other end is grounded. It also includes a filter capacitor C9 for filtering out noise jitter and stabilizing the voltage. Similarly, the backup power supply threshold setting module 5 is set in the same way; the resistance values and capacitance values can be adjusted according to different application requirements to adjust the threshold window of the power supply voltage, the hysteresis value of the lower voltage limit, and the hysteresis value of the upper voltage limit.
[0054] Please refer to Figure 6 The power-on / off module 6 includes a third MOSFET Q3, a switch interface JP1, a sixth resistor R14, a seventh resistor R13, an eighth resistor R12, a transient suppression diode D5, and a first capacitor C13. The input terminal of the switch interface JP1 is used to connect to the switch button. The output terminal of the switch interface JP1 is connected to one end of the sixth resistor R14 and one end of the seventh resistor R13. The other end of the sixth resistor R14 is connected to the gate of the third MOSFET Q3. The other end of the seventh resistor R13 is used to connect to the reference voltage (INTVcc). One end of the eighth resistor R12 is connected to the drain of the third MOSFET Q3, and the other end is connected to the switch input terminal (SHDN_N) of the switching control module 1. The source of the third MOSFET Q3 is grounded. The anode of the transient suppression diode D5 is connected to the output terminal of the switch interface JP1 and one end of the first capacitor C13. The cathode of the transient suppression diode D5 is connected to the other end of the first capacitor C13 and the source of the third MOSFET Q3.
[0055] Please refer to Figure 7 The output filter module 7 includes at least one electrolytic capacitor; the positive terminal of the electrolytic capacitor is connected to the power supply output terminal of the switching control module 1, and the negative terminal is grounded. For example... Figure 7 As shown, the output filtering module 7 includes electrolytic capacitor CD1, electrolytic capacitor CD2, and electrolytic capacitor CD3. The three electrolytic capacitors are used for output filtering of the system power supply circuit to stabilize the dynamic fluctuations of the power supply. At the same time, the energy storage function of the capacitors supports the seamless switching process of the dual power supply, so that the power drop is limited to the allowable range.
[0056] The specific working principle of the aforementioned fire emergency base station power supply is as follows:
[0057] After the circuit is powered on via the power-on / off module 6, if the adapter or battery is the sole power source, the power input is divided by the main power supply threshold setting module 4 or the backup power supply threshold setting module 5. The switching control module 1 then determines whether the input voltage level meets the threshold setting requirements. If it consistently meets the requirements within the TMR setting time range, the switching control module 1 activates the dual MOSFETs of the main power input module 2 or the backup power input module 3 to power the system. The switching control module 1 defaults to a higher priority for the main power input module 2; that is, when both the main power supply and the backup power supply are available simultaneously, the system is powered by the main power supply, and the backup power supply does not consume power. Therefore, power switching occurs in two scenarios:
[0058] (1) When the system is powered by the backup power battery, the main power supply is connected and available; at this time, the switching control module 1 turns off the dual MOS transistor of the backup power input module 3 and judges the voltage difference between the output voltage and the main power input voltage. When the voltage difference reaches more than 120mV, the dual MOS transistor of the main power input module 2 is turned on to realize the main power supply and complete the power switching.
[0059] (2) When both the main and backup power supplies are connected and available, the main power supply with higher priority will provide power. When the main power supply is disconnected or unavailable, the switching control module 1 will turn off the dual MOSFETs of the main power input module 2 and judge the voltage difference between the output voltage and the backup power input voltage. When the voltage difference reaches more than 120mV, the dual MOSFETs of the backup power input module 3 will be turned on to realize backup power supply and complete the power switching. When powered by the battery, under low power conditions, after the battery undervoltage protection and in the no-load state, the battery will have a certain rebound voltage, which will cause the battery power supply circuit to restart and the system to restart. Therefore, a certain hysteresis voltage threshold is set by the main power threshold setting module 4 and the backup power threshold setting module 5 so that the battery power supply cannot reach the hysteresis threshold after the voltage rebound and the power supply cannot be restarted.
[0060] When the power is turned off via the power-on / off module 6, the switching control module 1 shuts down all MOSFETs, resulting in no output voltage.
[0061] The fire emergency base station power supply uses MOSFETs to control the power supply circuit, effectively achieving low loss and high efficiency. The switching control module 1 judges the input of the main and backup power supplies and controls the switching of the MOSFETs to complete the rapid power switching. It also has the feature of prioritizing the main power supply. When the output voltage is greater than the input voltage, the MOSFETs do not turn on, avoiding the problem of reverse current. A hysteresis voltage is set at the battery power supply end, which effectively avoids the problem of repeated restarts when the battery is low. It meets the requirement that the voltage difference between the two power supplies can be positive or negative, and solves the problem of restarts caused by rebound voltage when the battery is low.
[0062] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A fire emergency base station power supply, characterized in that, This includes a switching control module, a main power input module, and a backup power input module; Both the main power input module and the backup power input module include dual MOSFETs; The first power input terminal of the switching control module is connected to the power input terminal of the main power input module, and the power input terminal of the main power input module is used to connect to the first power source. The first monitoring terminal of the switching control module is connected to the source of the main power input module; The first control terminal of the switching control module is connected to the gate of the main power input module; The second power input terminal of the switching control module is connected to the power input terminal of the backup power input module, and the power input terminal of the backup power input module is used to connect to the second power source. The second monitoring terminal of the switching control module is connected to the source terminal of the backup power input module; The second control terminal of the switching control module is connected to the gate of the backup power input module.
2. The fire emergency base station power supply according to claim 1, characterized in that, The main power input module includes a first MOSFET, a second MOSFET, and an RCD absorption unit; The drain of the first MOSFET is used to connect to the first power supply; The drain of the second MOS transistor is connected to the first terminal of the RCD absorption unit and the power supply output terminal of the switching control module, respectively. The source of the first MOS transistor and the source of the second MOS transistor are both connected to the first monitoring terminal of the switching control module; The gates of both the first MOS transistor and the second MOS transistor are connected to the second terminal of the RCD absorption unit. The third terminal of the RCD absorption unit is connected to the first control terminal of the switching control module.
3. The fire emergency base station power supply according to claim 2, characterized in that, The main power input module also includes a bidirectional suppression diode and an input filter capacitor; The positive terminal of the bidirectional suppression diode is connected to one end of the input filter capacitor and the drain of the first MOS transistor, respectively. The negative terminal of the bidirectional suppression diode is connected to the other end of the input filter capacitor and grounded.
4. The fire emergency base station power supply according to claim 1, characterized in that, It also includes a main power supply threshold setting module and a backup power supply threshold setting module; The input terminal of the main power threshold setting module is used to connect to the first power supply; The output terminal of the main power threshold setting module is connected to the main power setting input terminal of the switching control module. The input terminal of the backup power threshold setting module is used to connect to the second power source; The output of the backup power threshold setting module is connected to the backup power setting input of the switching control module.
5. A fire emergency base station power supply according to claim 4, characterized in that, The main power threshold setting module includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; The main power supply setting input terminal includes an undervoltage threshold pin, an overvoltage threshold pin, and a hysteresis pin. One end of the first resistor is used to connect to the first power supply, and the other end of the first resistor is connected to one end of the second resistor and one end of the fourth resistor, respectively. The other end of the fourth resistor is connected to the undervoltage threshold pin; The other end of the second resistor is connected to one end of the third resistor and the overvoltage threshold pin, respectively; The other end of the third resistor is grounded; One end of the fifth resistor is connected to the hysteresis pin, and the other end is grounded.
6. The fire emergency base station power supply according to claim 1, characterized in that, It also includes a power on / off module; The input terminal of the power-on / off module is used to receive power-on / off signals; The output terminal of the power-on / off module is connected to the switch input terminal of the switching control module.
7. A fire emergency base station power supply according to claim 6, characterized in that, The power-on / off module includes a third MOSFET, a switching interface, a sixth resistor, a seventh resistor, and an eighth resistor; The input terminal of the switch interface is used to connect to the switch button; The output terminal of the switch interface is connected to one end of the sixth resistor and one end of the seventh resistor, respectively. The other end of the sixth resistor is connected to the gate of the third MOS transistor; The other end of the seventh resistor is used to connect to a reference voltage; One end of the eighth resistor is connected to the drain of the third MOS transistor, and the other end is connected to the switch input terminal of the switching control module. The source of the third MOS transistor is grounded.
8. A fire emergency base station power supply according to claim 7, characterized in that, The power-on / off module also includes a transient suppression diode and a first capacitor; The positive terminal of the transient suppression diode is connected to the output terminal of the switch interface and one end of the first capacitor, respectively. The negative terminal of the transient suppression diode is connected to the other end of the first capacitor and the source of the third MOS transistor, respectively.
9. A fire emergency base station power supply according to claim 1, characterized in that, It also includes an output filtering module; The output filtering module is connected to the power supply output terminal of the switching control module.
10. A fire emergency base station power supply according to claim 9, characterized in that, The output filtering module includes at least one electrolytic capacitor; The positive terminal of the electrolytic capacitor is connected to the power supply output terminal of the switching control module, and the negative terminal is grounded.