Protective power supply control circuit and Ethernet power supply equipment comprising same

Abstract

The utility model discloses a protective power supply control circuit and Ethernet power supply equipment comprising the same, and relates to the technical field of power supplies, the protective power supply control circuit comprises a power supply input end J1, an anti-reverse connection module, an anti-sparking module and an output module, the anti-reverse connection module and the anti-sparking module are sequentially connected to the power supply input end, and the output module is connected with the power supply input end J1. The anti-sparking module is connected to the output module; the reverse connection prevention module comprises a power supply input end J1, a resistor R1, an MOS tube Q1, a first voltage stabilization module and a second voltage stabilization module. The positive electrode of the power supply input end J1 is connected with the resistor R1, then is connected with the source electrode of the MOS tube Q1 through the second voltage stabilizing module and is connected with the grid electrode of the MOS tube Q1 through the first voltage stabilizing module, and the drain electrode of the MOS tube Q1 is connected with the grounding point of the power supply input end J1; the output module is used for power supply connection. According to the utility model, anti-reverse connection, anti-sparking and short-circuit protection functions are realized, the safety and stability of power utilization are improved, and the device has the advantages of low cost and low loss, and can be suitable for high-voltage and large-current power supply control and protection.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field especially a protective power control circuit and the power supply control circuit containing power supply equipment of ethernet power supply of containing power supply control circuit. BACKGROUND

[0002] Traditional power supply mode usually needs to be inserted into power socket or uses power adapter, and this power supply mode can be relatively complex in wiring because the arrangement, management and safety of power line need to be considered in addition to data line. Ethernet power supply equipment provides a solution with diversified characteristics such as high reliability, high safety, high efficiency, energy saving and environmental protection, high flexibility and expansibility, and flexible power supply scheme. This kind of ethernet power supply equipment converts the voltage or current of power adapter to network cable and then supplies power to the terminal equipment in the rear stage. However, when the power adapter is inserted into the power socket of the ethernet power supply equipment, the incorrect polarity of the power supply can burn the rear equipment, and it is easy to produce sparking when plugging in. Therefore, protection measures against reverse connection and sparking are needed at the input end of this ethernet power supply equipment.

[0003] The existing anti-reverse connection and anti-sparking power control circuit generally adopts the scheme of realizing anti-reverse connection by connecting a diode at the power input end and realizing anti-sparking by connecting a thermistor behind the diode. The disadvantage of this protection scheme is that when the load current is large, a large voltage drop will be generated across the diode, resulting in that the output voltage and current of the power supply equipment do not match the actual demand, the output voltage fluctuates greatly, the safety and stability of power consumption are reduced, and if the circuit is used in a large current scenario, the thermistor will lose control and there is a risk of burning the thermistor. UTILITY MODEL CONTENTS

[0004] The utility model aims at the problem that when the load current of the power control circuit in the prior art is large, the output voltage and current do not match the actual demand, the output voltage fluctuates greatly, and the safety and stability of power consumption are reduced, and provides a protective power control circuit and an ethernet power supply equipment containing the power control circuit.

[0005] One scheme of the utility model is as follows:

[0006] The utility model provides a protection type power control circuit, including: power input terminal J1, anti-reverse module, anti-arcing module and output module, anti-reverse module and anti-arcing module are connected in sequence in power input terminal, and anti-arcing module is connected to the output module, anti-reverse module includes: power input terminal J1, resistance R1, MOS tube Q1, first voltage stabilizing module and second voltage stabilizing module, the positive pole of power input terminal J1 is connected after resistance R1, is connected to the source electrode of MOS tube Q1 through second voltage stabilizing module, is connected to the gate of MOS tube Q1 through first voltage stabilizing module, the drain electrode of MOS tube is connected to the grounding point of power input terminal J1, and the output module is used for power supply connection.

[0007] The utility model discloses a protection type power control circuit, when the positive pole of power input terminal J1 is not connected reversely, the positive pole current is loaded to the gate of MOS tube Q1 through the voltage of first voltage stabilizing module after R1, makes the gate voltage Vgs of MOS tube Q1 equal with the clamping voltage, and is greater than the threshold voltage of MOS tube Q1, and MOS tube Q1 is in the forward bias conduction state, and the conduction voltage drop is almost zero, when the positive pole of power input terminal J1 and the grounding point are connected reversely, the source electrode of MOS tube Q1 is loaded to the source electrode of MOS tube Q1 through second voltage stabilizing module, and the drain electrode of MOS tube Q1 is connected to the positive pole, makes MOS tube Q1 unable to conduct, and the clamping voltage and the gate voltage are all zero, and MOS tube Q1 is cut off, and the whole power supply passage is disconnected, and the circuit of connecting reversely will not be added to the output circuit of later stage, thereby the circuit of later stage is protected, realizes the function of anti-reverse connection, makes output voltage, current more in line with the output voltage of later stage, reduces the volatility of output voltage, and further improves the security and stability of electricity.

[0008] Preferably, the utility model discloses a protection type power control circuit, and the first voltage stabilizing module includes the diode D1 and resistance R1 in parallel, the cathode of diode D1 is connected with the common terminal of resistance R1 and resistance R2, and the anode of diode D1 is connected with the gate of MOS tube Q1.

[0009] As a preferred scheme of the utility model, the positive pole of power input terminal J1 is loaded to the source electrode of MOS tube Q1 through resistance R1 and resistance R3, can provide working voltage for MOS tube Q1, and MOS tube Q1 is in the conduction state, and the conduction voltage drop is basically zero, further improves the voltage stabilizing effect of MOS tube Q1 conduction voltage, and provides a faster discharge channel for Q1 gate voltage when power is off.

[0010] Preferably, the protective power supply control circuit, the second voltage stabilizing module includes parallel connection voltage stabilizing diode D2 and resistance R3, the cathode of voltage stabilizing diode D2 is connected with the common terminal of resistance R1 and resistance R3, and the anode of voltage stabilizing diode D2 is connected with the source of MOS tube Q1.

[0011] As a preferred scheme of the utility model, by setting the second voltage stabilizing module including voltage stabilizing diode D2 and resistance R3, voltage stabilizing diode D2 provides more stable working conditions for MOS tube Q1, and further reduces the volatility of output voltage.

[0012] Preferably, the protective power supply control circuit, the anti-fire module includes resistance R4, resistance R5, resistance R6, resistance R7, diode D3, voltage stabilizing diode D4, capacitor C1 and MOS tube Q2, the positive pole of power input terminal J1 is connected with the source of MOS tube Q2 after resistance R4 and resistance R5, the source of MOS tube Q2 is connected with the source of MOS tube Q1, the positive pole of power input terminal J1 is connected with the gate of MOS tube Q2 after resistance R6 and resistance R7, the drain of MOS tube Q2 is connected with output circuit, and the positive pole of power input terminal J1 is connected with output circuit.

[0013] The cathode of diode D3 is connected with the common terminal of resistance R4 and resistance R5, the anode of diode D3 is connected with the common terminal of resistance R6 and resistance R7, the cathode of voltage stabilizing diode D4 is connected with the common terminal of resistance R6 and resistance R7,

[0014] One end of capacitor C1 is connected with the common terminal of resistance R4 and resistance R5, and the other end of capacitor C1 is connected with the source of MOS tube Q2.

[0015] As the preferred scheme of the utility model, through the above specific anti - strike module setting, when the power supply polarity of external adapter input is correct, the instant MOS tube Q1 is turned on, the source voltage of MOS tube Q1 is almost zero, and the source of MOS tube Q2 is equivalent to connecting to the ground point;During the initial power-on, the positive electrode is added to the capacitor C1 through the resistance R4, so that the voltage V4 of the end of the resistance R5 connected to the resistance R4 is basically zero;The positive electrode is added to the anode of diode D3 through resistance R6, so that diode D3 is turned on, the voltage V5 of the end of resistance R6 connected to resistance R7 is greater than zero and less than the threshold voltage of MOS tube Q2, and the voltage V5 is added to the gate of MOS tube Q2 through resistance R7, so that MOS tube Q2 is in the cut-off state, the whole power supply path is disconnected, and there is no large current flow, so that the plug of the power adapter does not strike when it is in contact with the spring leaf of the power socket, and the anti - strike performance is realized;After a period of power-on, the positive electrode is charged to the capacitor C1 through the resistance R4, the voltage of the end of the resistance R5 connected to the resistance R4 is raised, and when the voltage V5 is raised to greater than the threshold voltage of MOS tube Q2, MOS tube Q2 is biased and turned on, realizing normal power supply to the rear circuit;The positive electrode continues to charge the capacitor C1 through the resistance R4, and when the voltage V5 is raised to break down the voltage stabilizing diode D4, the voltage V5 is clamped to a clamping voltage, the voltage V4 is stable, and the diode D3 is reverse biased and cut off, so that the whole circuit enters a stable state, realizing continuous power supply to the rear circuit;When the output circuit is short-circuited, the positive electrode voltage V1 and the voltage V5 are both zero, MOS tube Q1 and MOS tube Q2 are cut off, and the whole circuit is in a disconnected state, thereby realizing short-circuit protection;Further, the protective power supply control circuit can adapt to high-voltage and large-current power supply equipment, has low loss and low cost, improves economic benefit and practical value.

[0016] Preferably, the protective power supply control circuit, the output module comprises: PSE controller and network interface;The PSE controller is used for controlling and protecting the output circuit;The network interface is used for interactive connection with the Ethernet device.

[0017] As the preferred scheme of the utility model, through the above output module, the output voltage and data transmission can be more safe and stable.

[0018] In order to realize the purpose of the utility model, another scheme of the utility model is provided.

[0019] An Ethernet power supply device comprises the protective power supply control circuit, the power input end J1 is used for connecting power supply, and then the electric energy can be obtained;The output module is used for connecting the electric equipment, and then the electric energy can be output.

[0020] The power supply control circuit of the utility model has the advantages that the circuit cannot be connected reversely to the output circuit of the rear stage, thereby protecting the circuit of the rear stage, realizing the function of anti-reverse connection, making the output voltage and current more in line with the output voltage of the rear stage, reducing the volatility of the output voltage, and improving the safety and stability of power utilization.

[0021] In summary, due to the adoption of the above technical solutions, the utility model has the advantages that:

[0022] 1. The power supply control circuit of the utility model has the advantages that the circuit cannot be connected reversely to the output circuit of the rear stage, thereby protecting the circuit of the rear stage, realizing the function of anti-reverse connection, making the output voltage and current more in line with the output voltage of the rear stage, reducing the volatility of the output voltage, and improving the safety and stability of power utilization.

[0023] 2. The power supply control circuit of the utility model has the advantages that the circuit cannot be connected reversely to the output circuit of the rear stage, thereby protecting the circuit of the rear stage, realizing the function of anti-reverse connection, making the output voltage and current more in line with the output voltage of the rear stage, reducing the volatility of the output voltage, and improving the safety and stability of power utilization. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The utility model relates to a circuit structure block diagram. DETAILED DESCRIPTION

[0025] The utility model will be described in detail in combination with the drawings.

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described in further detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the utility model.

[0027] Example 1:

[0028] As Figure 1As shown, the embodiment discloses a protective power supply control circuit, which comprises a power input terminal J1, an anti-reverse connection module, an anti-arcing module and an output module, the anti-reverse connection module and the anti-arcing module are sequentially connected to the power input terminal, and the anti-arcing module is connected to the output module; the anti-reverse connection module comprises the power input terminal J1, a resistor R1, a MOS tube Q1, a first voltage stabilizing module and a second voltage stabilizing module; the positive pole of the power input terminal J1 is connected to the resistor R1, and then is connected to the source pole of the MOS tube Q1 through the second voltage stabilizing module and is connected to the gate pole of the MOS tube Q1 through the first voltage stabilizing module; the drain pole of the MOS tube is connected to the grounding pole of the power input terminal J1; and the output module is used for power supply connection.

[0029] It should be noted that the MOS tube Q1 or the MOS tube Q2 is understood as a field effect transistor, which controls the current of an output loop by controlling the electric field effect of an input loop, has three pins: a gate pole, a source pole and a drain pole, and the conduction state between the source pole and the drain pole is controlled through the gate voltage.

[0030] The utility model discloses, specifically, refer to Figure 1 As shown, the first voltage stabilizing module comprises a diode D1 and a resistor R1 in parallel; the cathode of the diode D1 is connected to the common terminal of the resistor R1 and a resistor R2, and the anode of the diode D1 is connected to the gate pole of the MOS tube Q1; specifically, the second voltage stabilizing module comprises a voltage stabilizing diode D2 and a resistor R3 in parallel; the cathode of the voltage stabilizing diode D2 is connected to the common terminal of the resistor R1 and the resistor R3, and the anode of the voltage stabilizing diode D2 is connected to the source pole of the MOS tube Q1.

[0031] The working principle of the anti-reverse connection module is shown in the reference Figure 1 As shown, Figure 1 In the reference Figure 1The anode of the diode D1 and the diode D3 is marked as 1, and the cathode is marked as 2; when the external adapter power supply is inserted into the power socket, the general input voltage range is 44V-57V; for example, when the input voltage is 56V, the positive voltage VCC=56V when the external adapter power supply is inserted into the power socket, the VCC is added to the source of the MOS tube Q1 through the resistor R1 and the resistor R3, the drain of the MOS tube is connected with GND, at this time, the MOS tube Q1 is forward biased and turned on, the voltage V3 at V3=0.7V, the voltage at V1 is the voltage divided by the resistor R1 and the resistor R3, V1=28.35V, the voltage at V1 is clamped and stabilized at 12V, and the V1 voltage is added to the gate of the MOS tube Q1 through the resistor R2, Vgs=V1>Vgsth, the MOS tube Q1 is turned on, and after the MOS tube Q1 is turned on, the conduction voltage drop is basically 0, so that Vgs=V1, the MOS tube maintains the conduction state, the whole power supply path is turned on, the power supply supplies power to the subsequent load, and the subsequent circuit works normally; if the power supply is connected reversely, the negative pole GND or the grounding point of the power supply is added to the source of the MOS tube Q1 through the resistor R1 and the resistor R3, the drain of the MOS tube Q1 is connected with VCC, the MOS tube Q1 cannot be reversely biased and turned on; V1=0V, V1 is added to the gate of the MOS tube Q1 through the resistor R2, Vgs=0, the MOS tube Q1 is cut off, the whole power supply path is disconnected, and the reversely connected power supply cannot be added to the subsequent circuit, so that the circuit of the subsequent stage is protected, and the reverse connection prevention function is realized.

[0032] It can be understood that the connection in the utility model can be understood as an electrical connection, specifically, referring to Figure 1 The grounding point / terminal of the power input end J1 is connected with the drain of the MOS tube Q1, the VCC terminal / positive pole of the power input end J1 is connected with the source of the MOS tube Q1 through the resistor R1 and the resistor R3; the VCC terminal of the power input end is also connected with the gate of the MOS tube Q1 through the resistor R1 and the resistor R2; the cathode of the diode D1 is connected with the common terminal of the resistor R1 and the resistor R2, and the anode of the diode D1 is connected with the gate of the MOS tube Q1; the cathode of the voltage stabilizing diode D2 is connected with the common terminal of the resistor R1 and the resistor R3, and the anode of the voltage stabilizing diode D2 is connected with the source of the MOS tube Q1.

[0033] It should be noted that the anti-spark module can be understood as a circuit module that can prevent high voltage from occurring during the instant of power plugging, such as a circuit that uses a thermistor or an IC chip to control a MOS transistor. Specifically, the anti-spark module includes: resistor R4, resistor R5, resistor R6, resistor R7, diode D3, zener diode D4, capacitor C1, and MOS transistor Q2. The positive electrode of the power input terminal J1 is connected to the source electrode of the MOS transistor Q2 after passing through resistor R4 and resistor R5. The source electrode of the MOS transistor Q2 is connected to the source electrode of the MOS transistor Q1. The positive electrode of the power input terminal J1 is connected to the gate electrode of the MOS transistor Q2 after passing through resistor R6 and resistor R7. The drain electrode of the MOS transistor Q2 is connected to the output circuit. The positive electrode of the power input terminal J1 is connected to the output circuit. The cathode of the diode D3 is connected to the common terminal of resistor R4 and resistor R5, and the anode of the diode D3 is connected to the common terminal of resistor R6 and resistor R7. The cathode of the zener diode D4 is connected to the common terminal of resistor R6 and resistor R7. One end of the capacitor C1 is connected to the common terminal of resistor R4 and resistor R5, and the other end of the capacitor C1 is connected to the source electrode of the MOS transistor Q2.

[0034] Among them, the anti-spark principle of the anti-spark module: Refer to Figure 1 As shown, when the power supply polarity input by the external adapter is correct, at the instant when the adapter plug contacts the internal reed of the power socket, the MOS transistor Q1 conducts, and the loss of Q1 is very small, V3≈0V. The source electrode of the MOS transistor Q2 is equivalent to being grounded. In the initial stage of power-on, VCC is applied to the capacitor C1 through the resistor R4. The capacitance value of the capacitor C1 is relatively large, and the voltage at V4 does not change suddenly, V4≈0V. VCC is applied to the anode of the diode D3 through the resistor R6. At this time, the diode D3 is forward-biased and conducts, and the voltage at V5 is V5≈0.7V. The voltage at V5 is applied to the gate electrode of the MOS transistor Q2 through the resistor R7, Vgs = 0.7V < Vgsth, and the MOS transistor Q2 is in the cut-off state. The body diode of the MOS transistor Q2 is also in the cut-off state, which disconnects the overall power supply path, and there is no large current flowing in the overall circuit, so there will be no sparking when the plug of the power adapter contacts the reed of the power socket.

[0035] Wherein, the maintaining circuit of the anti-arcing module works normally: with the passage of time, VCC charges the capacitor C1 through the resistor R4, the voltage at V4 continuously rises, the voltage at V5 V5=V4+0.7V, when the gate voltage Vgs of the MOS tube Q2 V5>Vgsth, the MOS tube Q2 is turned on, the whole power supply path is realized to be turned on, the power supply normally supplies power to the circuit in the rear stage, then VCC continues to charge the capacitor C1 through the resistor R4, when V5=V4+0.7V is greater than the Zener breakdown voltage of the stabilizing diode D4, the voltage at V5 is clamped and stabilized at 12V, the voltage at V4 is finally stabilized at the voltage division value of the resistor R4 and the resistor R5, V4=VCC*R5 / (R4+R5)=18.67V, the diode D3 is cut off, and the whole circuit enters a stable state and continuously supplies power to the circuit in the rear stage.

[0036] The working principle of the short-circuit protection of the utility model is as follows: when the output circuit is short-circuited, the voltage at V1 and V5 is also simultaneously pulled low to make V1=V5=0V at the moment when the VCC voltage is pulled to the ground, the Vgs of the MOS tube Q1 and Q2 is 0V, the MOS tube Q1 and the MOS tube Q2 are cut off, and the whole circuit is in a disconnected state, so that short-circuit protection is realized.

[0037] Reference Figure 1 The output module of the utility model is used for outputting a connected electrical equipment, for example, comprising a controller and a network interface capable of network connecting an electrical equipment, and specifically, the output module of the embodiment comprises a PSE controller and a network interface; the PSE controller is used for controlling and protecting an output circuit; and the network interface is used for interactive connection with an Ethernet device.

[0038] Embodiment 2

[0039] The embodiment discloses an Ethernet power supply device, which comprises the protective power supply control circuit in embodiment 1, a power input end J1 is used for connecting a power supply, and then electrical energy can be acquired; and an output module is used for connecting an electrical equipment, and then electrical energy can be output.

[0040] In the utility model, when an external adapter power supply is inserted into a power socket Figure 1 The anti-reverse connection part circuit realizes the anti-reverse connection function, Figure 1 The anti-arcing part circuit realizes the anti-arcing function, when the output circuit part is short-circuited, the whole circuit is in a disconnected state, and the function of short-circuit protection is realized.

[0041] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A protective power supply control circuit, characterized in that, include: The system comprises a power input terminal J1, a reverse connection protection module, an anti-arcing module, and an output module. The reverse connection protection module and the anti-arcing module are sequentially connected to the power input terminal, and the anti-arcing module is connected to the output module. The reverse connection protection module includes: a power input terminal J1, a resistor R1, a MOSFET Q1, a first voltage regulator module, and a second voltage regulator module. The positive terminal of the power input terminal J1 is connected to the resistor R1, and then connected to the source of the MOSFET Q1 via the second voltage regulator module and to the gate of the MOSFET Q1 via the first voltage regulator module. The drain of the MOSFET is connected to the ground point of the power input terminal J1. The output module is used for power supply connection.

2. The protective power supply control circuit according to claim 1, characterized in that, The first voltage regulator module includes a diode D1 and a resistor R1 connected in parallel; the cathode of the diode D1 is connected to the common terminal of the resistors R1 and R2, and the anode of the diode D1 is connected to the gate of the MOS transistor Q1.

3. The protective power supply control circuit according to claim 1, characterized in that, The second voltage regulator module includes a Zener diode D2 and a resistor R3 connected in parallel; the cathode of the Zener diode D2 is connected to the common terminal of the resistors R1 and R3, and the anode of the Zener diode D2 is connected to the source of the MOSFET Q1.

4. The protective power supply control circuit according to claim 1, characterized in that, The anti-sparking module includes: resistors R4, R5, R6, and R7, diode D3, Zener diode D4, capacitor C1, and MOSFET Q2; the positive terminal of the power input terminal J1 is connected to the source of MOSFET Q2 via resistors R4 and R5; the source of MOSFET Q2 is connected to the source of MOSFET Q1; the positive terminal of the power input terminal J1 is connected to the gate of MOSFET Q2 via resistors R6 and R7; the drain of MOSFET Q2 is connected to the output circuit; and the positive terminal of the power input terminal J1 is connected to the output circuit. The cathode of diode D3 is connected to the common terminal of resistors R4 and R5, and the anode of diode D3 is connected to the common terminal of resistors R6 and R7; the cathode of Zener diode D4 is connected to the common terminal of resistors R6 and R7. One end of capacitor C1 is connected to the common terminal of resistors R4 and R5, and the other end of capacitor C1 is connected to the source of MOSFET Q2.

5. The protective power supply control circuit according to claim 1, characterized in that, The output module includes a PSE controller and a network interface; the PSE controller is used to control and protect the output circuit; the network interface is used to interact with Ethernet devices.

6. A Power over Ethernet (PoE) device, characterized in that, The circuit includes a protective power control circuit as described in any one of claims 1-4, wherein the power input terminal J1 is used to connect to a power source to obtain electrical energy; and the output module is used to connect to electrical equipment to output electrical energy.

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