CN214480661U - Controlled on-off current expansion circuit for POE system - Google Patents
Controlled on-off current expansion circuit for POE system Download PDFInfo
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- CN214480661U CN214480661U CN202120644318.9U CN202120644318U CN214480661U CN 214480661 U CN214480661 U CN 214480661U CN 202120644318 U CN202120644318 U CN 202120644318U CN 214480661 U CN214480661 U CN 214480661U
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Abstract
The utility model discloses a controlled break-make expands a class circuit for POE system, include control chip and expand a class circuit, characterized in that: the current expanding circuit comprises a resistor R1, a resistor R2, a triode Q1 and a triode Q2, wherein an emitter of the triode Q1 is connected with the transformer through a resistor R1, an emitter of the triode Q1 is connected with a base of the triode Q2, a base of the triode Q1 is connected with a collector of the triode Q2 and connected with the control chip, a collector of the triode Q1 is grounded, an emitter of the triode Q2 is connected with the transformer, and the resistor R2 is connected with the triode Q2 in parallel. The utility model discloses can increase simple circuit on the interface and increase available current to obtain higher power.
Description
Technical Field
The utility model relates to an electronic communication field especially relates to a controlled break-make expands a class circuit for POE system.
Background
POE refers to a technology that, without any change in the existing ethernet cat.5 wiring infrastructure, can provide dc power for some IP-based terminals (such as IP phones, wireless lan access points AP, network cameras, etc.) while transmitting data signals. The POE technology can ensure the safety of the existing structured wiring and ensure the normal operation of the existing network, thereby reducing the cost to the maximum extent.
A complete POE system comprises two parts, namely a power supply end device PSE and a power receiving end device PD. The PSE device is a device for supplying power to the ethernet client device, and is also a manager of the entire POE ethernet power supply process. While PD devices are PSE loads receiving power, i.e. client devices of POE system, such as IP phones, network security cameras, APs and many other ethernet devices such as palm top computers or mobile phone chargers, in general, any device with power not exceeding 13W can obtain corresponding power from RJ45 socket. The two establish information connection related to connection condition, device type, power consumption level and the like of the power receiving end device PD based on the IEEE 802.3af standard, and power is supplied to the PD through the Ethernet according to the PSE.
The main device for power over ethernet is the PSE, which is responsible for the functions of PD detection, classification, power-up, and open circuit detection. Once a PD is loaded, the PSE will immediately detect the access of the PD and will cut power when the device is removed. IEEE 802.3af specifies that the PD draws no more than 15.4W of power from the port. The losses of the power switches and the DC-DC converter mean that the actual load does not get more than 13W. In practical applications, however, in some application scenarios, a standard PSE or PD control chip is adopted, but a larger output power than the standard specification is required.
SUMMERY OF THE UTILITY MODEL
The utility model aims to make power source equipment PSE's power controller can increase available current through increase the circuit that flows that expands on the interface to obtain higher power, thereby provide a controlled break-make that is used for POE system and expand the circuit that flows.
In order to solve the above problems, the utility model adopts the following technical proposal:
a controlled on-off current spreading circuit for a POE system comprises a control chip and a current spreading circuit, and is characterized in that: the current expanding circuit comprises a resistor R1, a resistor R2, a triode Q1 and a triode Q2, wherein an emitter of the triode Q1 is connected with a transformer through a resistor R1, an emitter of the triode Q1 is connected with a base of the triode Q2, a base of the triode Q1 is connected with a collector of the triode Q2 and connected with a control chip, a collector of the triode Q1 is grounded, an emitter of the triode Q2 is connected with the transformer, and the resistor R2 is connected with the triode Q2 in parallel.
Further, the transistor Q1 and the transistor Q2 are PNP type.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the utility model discloses a controlled break-make expands a class circuit for POE system can make any IEEE 802.3af Power Supply Equipment (PSE) power supply controller all can increase available current through simple change, increases simple circuit on the interface to obtain higher power.
Drawings
Fig. 1 is a circuit diagram of a first embodiment of the present invention;
fig. 2 is a circuit diagram of a second embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The first embodiment is as follows:
as shown in fig. 1, it is a specific implementation manner of the controlled on-off current expanding circuit for POE system, which is used for PSE circuit, including control chip and current expanding circuit, and is characterized in that: the current expanding circuit comprises a resistor R1, a resistor R2, a triode Q1 and a triode Q2, wherein an emitter of the triode Q1 is connected with a transformer through a resistor R1, an emitter of the triode Q1 is connected with a base of the triode Q2, a base of the triode Q1 is connected with a collector of the triode Q2 and connected with a control chip, a collector of the triode Q1 is grounded, an emitter of the triode Q2 is connected with the transformer, and the resistor R2 is connected with the triode Q2 in parallel. The maximum power of the port can be selected by changing R1, with this modification, a smaller port current flows through R2. If the port current is greater than a certain value, the voltage drop across R2 will be high enough to allow Q1 to open and additional current will flow through Q1. This modification will limit the current when the voltage drop across R1 reaches the value of the voltage between the base and emitter of Q2. At this point, the peak current of the port will be limited to the sum of the PSE chip peak output current and the current through Q1. Likewise, the continuous current in the port will be limited to the PSE chip continuous maximum current plus the current through Q1.
Further, the transistor Q1 and the transistor Q2 are PNP type.
Example two:
as shown in fig. 2, the difference from the first embodiment is that, the current spreading circuit is used in a PD circuit, and includes a control chip and a current spreading circuit, and is characterized in that: the current expanding circuit comprises a resistor R1, a resistor R2, a triode Q1 and a triode Q2, wherein an emitter of the triode Q1 is connected with a load through a resistor R1, an emitter of the triode Q1 is connected with a base of the triode Q2, a base of the triode Q1 is connected with a collector of the triode Q2 and connected with a control chip, a collector of the triode Q1 is connected with the control chip and a transformer, an emitter of the triode Q2 is connected with the load, and the resistor R2 is connected with the triode Q2 in parallel.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (2)
1. A controlled on-off current spreading circuit for a POE system comprises a control chip and a current spreading circuit, and is characterized in that: the current expanding circuit comprises a resistor R1, a resistor R2, a triode Q1 and a triode Q2, wherein an emitter of the triode Q1 is connected with a transformer through a resistor R1, an emitter of the triode Q1 is connected with a base of the triode Q2, a base of the triode Q1 is connected with a collector of the triode Q2 and connected with a control chip, a collector of the triode Q1 is grounded, an emitter of the triode Q2 is connected with the transformer, and the resistor R2 is connected with the triode Q2 in parallel.
2. The POE system of claim 1, wherein the transistor Q1 and the transistor Q2 are PNP type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120644318.9U CN214480661U (en) | 2021-03-30 | 2021-03-30 | Controlled on-off current expansion circuit for POE system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120644318.9U CN214480661U (en) | 2021-03-30 | 2021-03-30 | Controlled on-off current expansion circuit for POE system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214480661U true CN214480661U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120644318.9U Active CN214480661U (en) | 2021-03-30 | 2021-03-30 | Controlled on-off current expansion circuit for POE system |
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| CN (1) | CN214480661U (en) |
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2021
- 2021-03-30 CN CN202120644318.9U patent/CN214480661U/en active Active
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