Voice gateway for lossless switching of double mainboards

Abstract

The utility model discloses a double-mainboard lossless switching voice gateway, which comprises a first mainboard, a second mainboard, a first power supply circuit and a second power supply circuit, the first power supply circuit and the second power supply circuit are respectively used for supplying power to the first mainboard and the second mainboard, the first power supply circuit and the second power supply circuit have the same structure, and the first power supply circuit comprises a buffer circuit and an electronic switch. The buffer circuit is provided with a receiving end and an output end, and the receiving end is used for receiving an input power supply and is connected with the electronic switch through the output end to control the on-off of the electronic switch and output the power supply through the electronic switch; the buffer circuit is used for buffering instantaneous voltage and current of the receiving end of the buffer circuit of the first power supply circuit when the output end of the second power supply circuit is disconnected. According to the scheme, the problem of instantaneous loading of the working power supply for the hot plug action of double-mainboard maintenance can be relieved.

Description

Technical Field

[0001] The utility model relates to a voice gateway, in particular to a voice gateway with lossless switching of dual mainboards. Background Art

[0002] The dual-motherboard lossless switching voice gateway is a voice gateway that contains two motherboards with the same functions. Each motherboard can run independently and process voice data. When one motherboard fails or needs maintenance, it can be switched to the other motherboard. During the switching process, no ongoing calls or data packets will be lost, ensuring that the user experience is not affected.

[0003] Due to the dual motherboard setting, if one motherboard needs to be repaired while the other motherboard is working, a hot-swap action will occur. With the hot-swap action, since one motherboard is unplugged, the corresponding working voltage of the motherboard will be instantly loaded on the other motherboard, which is easy to cause damage to the working motherboard, so optimization is still needed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a voice gateway with lossless switching of dual motherboards, which can alleviate the problem of instantaneous loading of the working power supply during hot-plugging of dual motherboard maintenance.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a voice gateway with lossless switching of dual mainboards, comprising a first mainboard, a second mainboard, a first power supply circuit and a second power supply circuit for supplying power to the first mainboard and the second mainboard respectively, the first power supply circuit and the second power supply circuit having the same structure, the first power supply circuit comprising a buffer circuit and an electronic switch, the buffer circuit having a receiving end and an output end, and the receiving end is used to receive input power and connect the electronic switch through the output end to control the opening and closing of the electronic switch and output power through the electronic switch; the buffer circuit is used to buffer the instantaneous voltage and current of the receiving end of the buffer circuit of the first power supply circuit when the output end of the second power supply circuit is disconnected.

[0006] As a further improvement of the utility model, the buffer circuit includes a diode D1, a capacitor C1, a transistor Q1, and a transistor Q2, wherein the cathode of the diode D1 is connected to the receiving end, and the anode is grounded; the capacitor C1 is connected in parallel to both ends of the diode D1, and the anode corresponds to the receiving end; the base of the transistor Q1 is connected to the anode of the capacitor C1, and the base is also grounded through a resistor R2, the emitter is connected in series to the anode of the capacitor C1 through resistors R3 and R1 in sequence, and the collector is grounded; the base of the transistor Q2 is connected to the node where the resistors R3 and R1 are connected through a diode D2, the base is also grounded through the capacitor C2, the collector is connected to the control end of the electronic switch through a resistor R5, and the emitter is grounded; the resistor R5 is also connected to the anode of the capacitor C1 through a resistor R4; one end of the electronic switch is connected to the anode of the capacitor C1, and the other end controls the output power supply through the control end.

[0007] As a further improvement of the present invention, the receiving ends of the first power supply circuit and the second power supply circuit are both connected to a 5V power supply module, and the 5V power supply module outputs 5V power supply after receiving the power supply, and the output end of the 5V power supply module is also grounded through a transient suppression diode, and is connected to the first power supply circuit and the second power supply circuit after being grounded.

[0008] As a further improvement of the present invention, the resistor R1 is a temperature sensitive resistor.

[0009] As a further improvement of the present invention, the resistor R1 is an NTC temperature sensitive resistor.

[0010] The beneficial effect of the utility model is that the power loaded on the normal motherboard can be buffered to avoid instantaneous voltage and current from damaging the normal motherboard, thereby playing a protective role and realizing the effect of hot plugging when the dual motherboards are lostlessly switched. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the overall structural diagram of the utility model;

[0012] Figure 2 This is a structural diagram of the first power supply circuit of the utility model.

[0013] Figure numbers: 1. 5V power supply module; 2. First main board; 3. Second main board; 4. First power supply circuit; 41. Buffer circuit; 411. Thermostat; 42. Electronic switch; 5. Second power supply circuit; 6. Transient suppression diode. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0015] Reference Figure 1-2 As shown,

[0016] A dual-mainboard lossless switching voice gateway comprises a first mainboard 2, a second mainboard 3, a first power supply circuit 4 and a second power supply circuit 5 for supplying power to the first mainboard 2 and the second mainboard 3 respectively, the first power supply circuit 4 and the second power supply circuit 5 having the same structure, the first power supply circuit 4 comprising a buffer circuit 41 and an electronic switch 42, the buffer circuit 41 having a receiving end and an output end, and the receiving end is used to receive input power and connect the electronic switch 42 through the output end to control the opening and closing of the electronic switch 42 and output power through the electronic switch 42; the buffer circuit 41 is used to buffer the instantaneous voltage and current of the receiving end of the buffer circuit 41 of the first power supply circuit 4 when the output end of the second power supply circuit 5 is disconnected.

[0017] In this solution, any one of the first mainboard 2 and the second mainboard 3 can be switched to the normal mainboard to work after a failure, and the faulty mainboard can be hot-swapped for repair. After hot-swapping, the power load corresponding to the faulty mainboard disappears instantly, which may cause the corresponding power to be loaded on the normal mainboard. At this time, the buffer circuit 41 on the first power circuit 4 or the second power circuit 5 takes effect, and can buffer the power loaded on the normal mainboard to avoid instantaneous voltage and current from damaging the normal mainboard. This plays a protective role and realizes the role of hot-swapping when the dual mainboards are lostlessly switched.

[0018] Specifically, the following circuit can be used for implementation:

[0019] The buffer circuit 41 includes a diode D1 (SMBJ6.5A), a capacitor C1 (220μF / 16V), a transistor Q1 (9012), and a transistor Q2 (9013). The cathode of the diode D1 is connected to the receiving end, and the anode is grounded. The capacitor C1 is connected in parallel to both ends of the diode D1, and the anode corresponds to the receiving end. The base of the transistor Q1 is connected to the anode of the capacitor C1, and the base is also grounded through a resistor R2 (2K). The emitter is connected in series through a resistor R3 (560) and a resistor R1 (100K ) is connected to the positive electrode of capacitor C1, and the collector is grounded; the base of transistor Q2 is connected to the node where resistors R3 and R1 are connected through diode D2 (3V), the base is also grounded through capacitor C2 (47μF / 16V), the collector is connected to the control end of electronic switch 42 through resistor R5 (1K), and the emitter is grounded; resistor R5 is also connected to the positive electrode of capacitor C1 through resistor R4 (1K); one end of the electronic switch 42 is connected to the positive electrode of capacitor C1, and the other end controls the output power supply through the control end.

[0020] The transistor Q1 is a PNP transistor, the transistor Q2 is an NPN transistor, and the diode D2 can provide a clamping effect.

[0021] Wherein the electronic switch 42 can adopt field effect tube U1. When working, first the external 5V power supply module 1 will first input the 5V power supply to the receiving end of the buffer circuit 41, and perform transient suppression diode 6 through diode D1 to provide better protection. At the same time, capacitor C1 is used for filtering and charging to make the 5V power supply smoother. At the same time, charging for energy storage can provide a certain discharge current compensation effect. Then the resistor R1 is used for current limiting to improve the protection effect. The current after passing through the resistor R1 will charge the capacitor C2. While the capacitor C2 is charging, the diode D2 prevents the base-emitter of the transistor Q1 from being reversely biased. At this time, the base voltage of the transistor Q1 rises slowly, which has a delay effect, and cooperates with the resistor R2 to limit the current and divide the voltage until the transistor Q1 is turned on. At this time, the collector voltage drops, and the base voltage of the transistor Q2 is reduced by the resistor R3. At this time, the transistor Q2 is turned on, and the collector current provides further base current for the transistor Q1 through the resistor R4, forming positive feedback, and strengthening the conduction state of Q1. And as the transistor Q2 is turned on, the resistors R4 and R5 cooperate to divide the voltage, so that the control end of the field effect tube is boosted, so that the field effect tube can be turned on, and then the 5V power supply is output from the output end of the buffer circuit 41. In this solution, even if the faulty motherboard needs to be hot-plugged and removed, the instantaneous current and voltage can be absorbed by the buffer circuit 41 and suppressed by the capacitor C1 and the diode D1.

[0022] In a further configuration, in order to ensure stability during the power startup process, the resistor R1 is a thermistor 411 .

[0023] The resistor R1 can be an NTC thermistor 411, which can provide a higher resistance value when the circuit starts to limit the starting current. As the circuit temperature rises, the resistance value gradually decreases, allowing more current to pass. This helps to reduce the current impact of the circuit during cold start. The current can be limited at the moment the power is turned on. As the temperature of the thermistor itself rises, the current gradually increases to achieve a smooth current rise. The capacitor C2 is used to produce a delay effect, and the effect is smoother and more stable, which can provide better stability at the moment of circuit startup.

[0024] The resistor R1 can also be a PTC thermistor 411, which will generate heat when the current exceeds a certain threshold, and its resistance will increase accordingly, thereby limiting the current. This characteristic allows it to be used as a self-recovering overcurrent protection element. That is to say, when charging with the capacitor C2, once the temperature of the resistor R1 is too high, the current size will be limited, thereby improving the protection effect of the circuit.

[0025] This solution is aimed at the situation where the external 5V power module 1 is just connected to the buffer circuit 41, so that the working state at startup is more stable.

[0026] In order to increase the stability of the circuit during operation, the following optimization can also be made: the receiving ends of the first power supply circuit 4 and the second power supply circuit 5 are both connected to a 5V power supply module 1, and the 5V power supply module 1 outputs 5V power after receiving the power supply, and the output end of the 5V power supply module 1 is also grounded through a transient suppression diode 6, and is connected to the first power supply circuit 4 and the second power supply circuit 5 after being grounded.

[0027] The transient voltage suppression diode 6 can be used to suppress transient voltage at the output position of the 5V power module 1, thereby improving the protection of the first power circuit 4 and the second power circuit 5, and suppressing the transient state when one of the power circuits loses load, so as to further improve stability.

[0028] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A dual-mainboard lossless switching voice gateway, comprising a first mainboard, a second mainboard, a first power supply circuit and a second power supply circuit for supplying power to the first mainboard and the second mainboard respectively, characterized in that: The first power supply circuit and the second power supply circuit have the same structure. The first power supply circuit includes a buffer circuit and an electronic switch. The buffer circuit has a receiving end and an output end, and the receiving end is used to receive input power and connect the electronic switch through the output end to control the opening and closing of the electronic switch and output power through the electronic switch; the buffer circuit is used to buffer the instantaneous voltage and current of the receiving end of the buffer circuit of the first power supply circuit when the output end of the second power supply circuit is disconnected.

2. The voice gateway with lossless switching of dual motherboards according to claim 1 is characterized in that: The buffer circuit includes a diode D1, a capacitor C1, a transistor Q1, and a transistor Q2. The cathode of the diode D1 is connected to the receiving end, and the anode is grounded. The capacitor C1 is connected in parallel to both ends of the diode D1, and the anode corresponds to the receiving end. The base of the transistor Q1 is connected to the anode of the capacitor C1, and the base is also grounded through a resistor R2. The emitter is connected in series to the anode of the capacitor C1 through resistors R3 and R1, and the collector is grounded. The base of the transistor Q2 is connected to the node where the resistors R3 and R1 are connected through a diode D2, and the base is also grounded through the capacitor C2. The collector is connected to the control end of the electronic switch through a resistor R5, and the emitter is grounded. The resistor R5 is also connected to the anode of the capacitor C1 through a resistor R4. One end of the electronic switch is connected to the anode of the capacitor C1, and the other end controls the output power supply through the control end.

3. The voice gateway with lossless switching of dual motherboards according to claim 1 is characterized in that: The receiving ends of the first power supply circuit and the second power supply circuit are both connected to a 5V power supply module, and the 5V power supply module outputs 5V power supply after receiving power, and the output end of the 5V power supply module is also grounded through a transient suppression diode, and is connected to the first power supply circuit and the second power supply circuit after grounding.

4. The voice gateway with lossless switching of dual motherboards according to claim 2 is characterized in that: The resistor R1 is a temperature sensitive resistor.

5. The voice gateway with lossless switching of dual motherboards according to claim 4 is characterized in that: The resistor R1 is an NTC temperature sensitive resistor.

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