CN101989852A - Single board, communication equipment, device for controlling power on/off of single board and method thereof - Google Patents
Single board, communication equipment, device for controlling power on/off of single board and method thereof Download PDFInfo
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- CN101989852A CN101989852A CN2009100899806A CN200910089980A CN101989852A CN 101989852 A CN101989852 A CN 101989852A CN 2009100899806 A CN2009100899806 A CN 2009100899806A CN 200910089980 A CN200910089980 A CN 200910089980A CN 101989852 A CN101989852 A CN 101989852A
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Abstract
The embodiment of the invention relates to a single board, communication equipment, a device for controlling power on/off of the single board and a method thereof. The device for controlling power on/off of the single board comprises a power slow starting circuit and a signal isolation control circuit which are connected together, wherein, the signal isolation control circuit transforms a low-voltage side control signal into a high-voltage side control signal and isolates the low-voltage side control signal from the high-voltage side control signal; and the power slow starting circuit switches on/off the single board under control of the high-voltage side control signal. In the embodiment of the invention, on the basis of power supply of the existing single board in the equipment, the low-voltage side control signal sent by a control module is transformed into the high-voltage side control signal so as to control on/off of the power slow starting circuit, thus realizing power on/off control of the single board in the communication equipment under the condition of avoiding an additional external switching device.
Description
Technical field
The present invention relates to communication technique field, relate in particular to the device and method of a kind of veneer, communication apparatus, the power-on and power-off of control veneer.
Background technology
At present, more and more enjoy attention for communication apparatus energy-conservation, the telecom operators in the whole world have all proposed a lot of energy-saving and emission-reduction requirements for the long-time running energy consumption of communication system, comprise the quiescent dissipation requirement of communication apparatus.In order to satisfy lower quiescent dissipation requirement, adopted the power supply soft-start circuit in the communication apparatus.Control the power-on and power-off of veneer in the communication apparatus by turning on and off the power supply soft-start circuit, control under the situation electric under the load of veneer in the communication apparatus at the power cutoff soft-start circuit, make communication apparatus enter low energy consumption state,, satisfy the requirement of energy-saving and emission-reduction to reduce power consumption.
In the prior art, turning on and off of power supply soft-start circuit adopts switching device to realize.As shown in Figure 1, power supply input channel in the veneer is provided with independent switching device 11, switching device 11 is under the control of control signal (as PWRCtrl), opening or turn-offing by control power supply soft-start circuit 12, what the control power supply was imported opens or turn-offs, thereby realizes the control to load 13 power-on and power-off of veneer.Control signal PWRCtrl is from the control module of communication apparatus.Switching device commonly used has mechanical relay or electronic switching device such as field effect transistor (MOSFET) etc.
In realizing process of the present invention, the inventor finds that there is following defective at least in prior art:
Increase extra switching device in the periphery of power supply soft-start circuit and carry out the control that turns on and off of current supply circuit, increased the complexity of circuit, and it is bigger to take up room.
Summary of the invention
The embodiment of the invention proposes the device and method of a kind of veneer, communication apparatus, the power-on and power-off of control veneer.
The embodiment of the invention provides a kind of device of controlling the veneer power-on and power-off, comprises the power supply soft-start circuit, also comprises:
The Signal Spacing control circuit, described Signal Spacing control circuit is connected with described power supply soft-start circuit;
Described Signal Spacing control circuit is used for the low-pressure side control signal is converted to the high-pressure side control signal, and isolates described low-pressure side control signal and high-pressure side control signal; Described power supply soft-start circuit under the control of described high-pressure side control signal to Board Power up or down.
The embodiment of the invention also provides a kind of veneer, comprising: the device of above-mentioned control veneer power-on and power-off.
The embodiment of the invention also provides a kind of communication apparatus, comprising: above-mentioned veneer.
The embodiment of the invention also provides a kind of method of controlling the veneer power-on and power-off, comprising:
Receive the low-pressure side control signal;
Described low-pressure side control signal is converted to the high-pressure side control signal, and isolates described low-pressure side control signal and high-pressure side control signal;
Utilize described high-pressure side control signal control power supply soft-start circuit to open or turn-off.
The foregoing description is on the power supply basis of existing equipment veneer, be converted to the high-pressure side control signal by the low-pressure side control signal that control module is sent, turning on and off of control power supply soft-start circuit, thereby avoiding additionally increasing under the situation of external switch device, realized power-on and power-off control, made communication apparatus when the full port of veneer is idle, can control under the veneer veneer in the communication apparatus, enter energy saver mode, cut down the consumption of energy; Simultaneously also can make communication apparatus, under the situation of the function of the soft-start circuit that does not influence veneer, control Board Power up, enter normal mode of operation according to service needed.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the schematic diagram that turns on and off of power supply soft-start circuit in the prior art;
A kind of structural representation of controlling the device of veneer power-on and power-off that Fig. 2 provides for the embodiment of the invention;
The another kind that Fig. 3 provides for the embodiment of the invention is controlled the circuit theory diagrams of the device of veneer power-on and power-off;
The circuit theory diagrams of the device of another control veneer power-on and power-off that Fig. 4 provides for the embodiment of the invention;
The structural representation of the veneer that Fig. 5 provides for the embodiment of the invention;
The structural representation of the communication apparatus that Fig. 6 provides for the embodiment of the invention;
A kind of flow chart of controlling the method for veneer power-on and power-off that Fig. 7 provides for the embodiment of the invention.
Embodiment
A kind of structural representation of controlling the device of veneer power-on and power-off that Fig. 2 provides for the embodiment of the invention.Described device comprises: power supply soft-start circuit 21 and Signal Spacing control circuit 22.Signal Spacing control circuit 22 is connected with described power supply soft-start circuit 21; Described Signal Spacing control circuit 22 is used for the low-pressure side control signal is converted to the high-pressure side control signal, and described low-pressure side control signal and high-pressure side control signal are isolated; Described power supply soft-start circuit 21 powers on to the load of veneer under the control of described high-pressure side control signal or down.The low-pressure side control signal is sent by the control module in the communication apparatus, is used to control power supply soft-start circuit 21 and gives the veneer power-on and power-off.
In the present embodiment, Signal Spacing control circuit 22 is under the low-pressure side control signal PWRCtrl of communication apparatus control, low-pressure side control signal PWRCtrl is converted to the high-pressure side control signal sends to power supply soft-start circuit 21, field effect transistor (MOSFET) conducting in the control power supply soft-start circuit 21 or close, thereby open or powered-down soft-start circuit 21 power-on and power-off of control veneer.Solved prior art by increasing switching device carries out current supply circuit to the power supply soft-start circuit the complicated and problem such as bigger that takes up room of circuit that control brings that turns on and off.
The low-pressure side control signal can be level signal, also can be pulse signal.
When the low-pressure side control signal was level signal, Signal Spacing control circuit 22 can comprise: light-coupled isolation device, control circuit and limiting element.The light-coupled isolation device is used to isolate described low-pressure side control signal and high-pressure side control signal, avoids the low-pressure side control signal that power supply soft-start circuit 21 is exerted an influence, and guarantees that power supply soft-start circuit 21 only is subjected to the control of high-pressure side control signal.It is under the situation of high level that control circuit is used in described low-pressure side control signal, controls the collector and emitter saturation conduction of described light-coupled isolation device secondary; And be used for to be under the low level situation, to control the former limit of described light-coupled isolation device and end in described low-pressure side control signal.Current limiting element is used for limiting the electric current of the collector electrode of described light-coupled isolation device to emitter under the situation of the collector electrode of described light-coupled isolation device secondary and emitting stage saturation conduction.Described current limiting element can be resistance.
Described control circuit can comprise: driving resistor, pull down resistor and filter capacitor.One end of described driving resistor is connected with the anode on the former limit of described light-coupled isolation device, and the other end connects the control module be used to send described low-pressure side control signal, is used for the electric current on the former limit of described light-coupled isolation device is limited in 5 milliamperes of (mA)～10mA.One end of described pull down resistor is connected other end ground connection with the anode on the former limit of described light-coupled isolation device.One end of described filter capacitor is connected other end ground connection with the anode on the former limit of described light-coupled isolation device.The resistance of described pull down resistor can be 4.7 kilohms of (K Ω)～10K Ω; The appearance value of described electric capacity can be 0.1 microfarad (μ F)～0.47 μ F.
When the low-pressure side control signal was pulse signal, Signal Spacing control circuit 22 can comprise: isolating transformer, change-over circuit and triode.The former limit of described isolating transformer is connected with the control module that is used to send described low-pressure side control signal.Described change-over circuit is connected with the secondary of described isolating transformer, is used for the low-pressure side control signal is converted to described high-pressure side control signal.The base stage of described triode is connected with the other end of described driving resistor, collector electrode is connected with the gate driving resistance of field effect transistor in the described power supply soft-start circuit, and the source electrode of field effect transistor is connected in the secondary end of the same name of emitter and described isolating transformer and the described power supply soft-start circuit.
Described change-over circuit also can comprise: current-limiting resistance.The collector electrode of described triode is connected with the gate driving resistance of field effect transistor in the described power supply soft-start circuit by described current-limiting resistance.
Described Signal Spacing control circuit 22 also can comprise: capacitance.The former limit of described isolating transformer is connected with described control module by described capacitance.
The another kind that Fig. 3 provides for the embodiment of the invention is controlled the circuit theory diagrams of the device of veneer power-on and power-off.Described circuit comprises: power supply soft-start circuit 31 and Signal Spacing control circuit 32.Wherein RTN represents a 48V return terminal, and GND represents the place of working.
Power supply soft-start circuit 31 comprises N channel-type MOSFET pipe Q1.The control end of power supply soft-start circuit 31 is grid source electrodes of N type channel MOS tube Q1, and the control circuit of power supply soft-start circuit 31 self.Self control circuit of power supply soft-start circuit 31 comprises voltage stabilizing didoe D2, resistance R 5, capacitor C 2, resistance R 2, resistance R 1, capacitor C 1, diode D1, resistance R 4 and resistance R 3.Voltage stabilizing didoe D2 is connected in parallel between the gate driving resistance R 4 and source electrode of MOSFET pipe Q1.Also manage at N channel-type MOSFET between the gate driving resistance R 4 and drain electrode of Q1 resistance R 5 and capacitor C 2 series connection backs.Resistance R 2, resistance R 1, capacitor C 1 are formed the resistive-capacitive voltage divider network node, are cascaded with resistance R 2 after resistance R 1 and capacitor C 1 are connected in parallel, and are connected in parallel between the power input.The negative electrode of diode D1 is connected on the dividing potential drop node of resistance R 1, capacitor C 1 and resistance R 2; The anode of diode D1 is connected on the driving resistor R4 of grid of MOSFET pipe Q1.Anode and MOSFET that resistance R 4 is connected diode D1 manage between the grid of Q1.Resistance R 3 is connected between the anode and input positive source of diode D1.
The effect of resistance R 2, capacitor C 1 is to prevent MOSFET pipe Q1 misleading when just powering on.And the impedance of capacitor C 1 is lower during owing to just powered on, and therefore for resistance R 2 certain power requirement is arranged, and promptly under maximum input voltage Vin (max), the power of resistance R 2 is greater than Vin (max)
2/ R2.
The effect of resistance R 1 is to provide discharge channel to capacitor C 1, and requirement dividing potential drop on the resistance R 1 in input voltage range is greater than the voltage stabilizing value of voltage-stabiliser tube D2.
The main effect of diode D1 is: prevent that by capacitor C 1 MOSFET pipe Q1 from misleading when power supply soft-start circuit 31 powers on to the load on the veneer, and when capacitor C 1 voltage is higher than the grid voltage of MOSFET pipe Q1, end, influenced by capacitor C 1 with the gate charges process that prevents MOSFET pipe Q1.Because the forward conduction voltage drop of diode D2 can influence the shake time-delay, therefore, selects for use the little Schottky diode of conduction voltage drop preferable as diode D2 effect.
Resistance R 4, resistance R 5 are used to prevent MOSFET pipe Q1 self-oscillation, require the resistance of resistance R 4, resistance R 5＜＜resistance of resistance R 3.Resistance R 4 spans cause and mislead because resistance R 4 values are crossed conference, so can be 10 Ω～50 Ω.
After power supply soft-start circuit 31 powered on to load, voltage stabilizing didoe D2 provided the gate source voltage of MOSFET pipe Q1, protected simultaneously between the grid source electrode of MOSFET pipe Q1 and was not subjected to impacting with high pressure.
The charge circuit of resistance R 3 and capacitor C 2 is opening processes of control MOSFET pipe Q1, and the main effect of capacitor C 2 is parasitic capacitance (mainly being Cgd) non-linear of compensating MOS FET pipe Q1, require capacitor C 2＞＞Cgd+Cgs.Wherein, Cgd, Cgs are respectively drain-gate and the grid source parasitic capacitances of MOSFET pipe Q1.
Signal Spacing control circuit 32 comprises light-coupled isolation device U1 and peripheral devices such as resistance R 6, resistance R 7, resistance R 8 and capacitor C 3.The secondary collector electrode of light-coupled isolation device U1 (the C utmost point) is connected on the resistance R 4 of power supply soft-start circuit 31 by resistance R 6.Resistance R 4 is the driving resistor that the MOSFET of N channel-type manages the grid of Q1.The emitter of light-coupled isolation device U1 (the E utmost point) is connected with the source electrode of MOSFET pipe Q1.Controlling and driving signal PWRCtrl is connected to the anode on the former limit of light-coupled isolation device U1 by driving resistor R7.Between 5mA～10mA, filter capacitor C3 and earth resistance R8 are connected between the anode and negative electrode on former limit of light-coupled isolation device U1 driving resistor R7 the electric current on the former limit of light-coupled isolation device U1 limit.The span of filter capacitor C3 can be 0.1uF～0.47uF, and the span of earth resistance R8 can be 4.7K Ω～10K Ω.
The control module of communication apparatus sends to Signal Spacing control circuit 32 with Energy Saving Control signal PWRCtrl, the control that MOSFET pipe Q1 on the power supply soft-start circuit by 32 pairs of veneers of Signal Spacing control circuit opens or turn-offs, opening or turn-offing in order to the input power supply of realizing veneer.
Level (as TTL) control signal PWRCtrl from control module in the communication apparatus drives light-coupled isolation device U1, because control signal PWRCtrl is a low voltage level, light-coupled isolation device U1 is used to isolate control signal that the communication apparatus control module sends and the control signal of MOSFET pipe Q1, by turning on and off of MOSFET pipe Q1 in the control power supply soft-start circuit 31, thus the turn-on and turn-off of realization input power channel.
When control signal PWRCtrl is low level or NC state when being no signal, the former not conducting of limit of light-coupled isolation device U1, this moment, control signal PWRCtrl was inoperative, did not influence normally working on power of 31 pairs of veneers of power supply soft-start circuit.
When control signal PWRCtrl is high level, electric current I=V (PWRCtrl)/R7 that light-coupled isolation device U1 passes through on former limit.At this moment, the value that resistance R 7 is got will guarantee the CE utmost point saturation conduction of light-coupled isolation device U1 secondary, and the gate drive voltage of MOSFET pipe Q1 is pulled low to low level, and MOSFET pipe Q1 turn-offs, and capacitor C 2 is discharged the soft start function of Reset Board simultaneously.The CE electric current of resistance R 6 restriction light-coupled isolation device U1 secondary, the CE that avoids at light-coupled isolation device U1 light-coupled isolation device U1 saturation conduction moment by big electric current, and damage light-coupled isolation device U1, therefore, the resistance of resistance R 6 will be far smaller than the resistance of resistance R 3.
When the control module of communication apparatus is not sent control signal PWRCtrl, when being the no input signal of Signal Spacing control circuit 32, the anode on the former limit of light-coupled isolation device U1 is pulled to low level by resistance R 8, the light-coupled isolation device U1 secondary CE utmost point ends, MOSFET pipe Q1 conducting in the power supply soft-start circuit 31, the load that power supply soft-start circuit 31 is opened to veneer powers on.
In the present embodiment, the core devices of the device of control veneer power-on and power-off is light-coupled isolation device U1 and the pipe of the MOSFET in the power supply soft-start circuit 31 Q1 of Signal Spacing control circuit 32.Need to prove that MOSFET pipe Q1 is the part of existing input power supply soft-start circuit, not for realizing that electric control increases under the veneer.For realizing input power supply power-on and power-off control, the extra device that increases is light-coupled isolation device U1 and the peripheral element in the Signal Spacing control circuit 32 in the communication apparatus.Under the situation of not considering light-coupled isolation device U1, MOSFET pipe Q1 just is used for constituting power supply soft-start circuit 31, and is irrelevant with electric control function under the power supply of the device of control veneer power-on and power-off.
The circuit theory diagrams of the device of another control veneer power-on and power-off that Fig. 4 provides for the embodiment of the invention.Described circuit comprises: power supply soft-start circuit 41 and Signal Spacing control circuit 42.Wherein RTN represents-return terminal of 48V, and GND represents signal ground.In the present embodiment, the power supply soft-start circuit 31 that power supply soft-start circuit 41 provides with above-mentioned embodiment.Signal Spacing control circuit 42 adopts the type of drive of isolating transformer to control the MOSFET pipe Q1 of the N channel-type of power supply soft-start circuit 41.
Signal Spacing control circuit 42 comprises isolating transformer T1 and control circuit thereof.The control circuit of isolating transformer T1 comprises: capacitor C 4, diode D3, triode Q2, driving resistor R7, resistance R 6, filter capacitor C3.Capacitor C 4 one ends are connected the former limit end of the same name of isolating transformer T1, and the other end receives the control signal PWRCtrl from the communication apparatus control module.The anode of diode D3 connects the secondary end of the same name of isolating transformer T1.Triode Q2 is the NPN type, and the base stage of triode Q2 is connected with the negative electrode of diode D3 by driving resistor R7; The collector electrode of triode Q2 connects the gate driving resistance R 4 of MOSFET pipe Q1 in the power supply soft-start circuit 41 by resistance R 6.Filter capacitor C3 one end is connected with the node of the D3 negative electrode of resistance R 7 and diode, and the other end connects the emitter of triode Q2.
In the present embodiment, control signal PWRCtrl is a pulse signal, and capacitor C 4 is a capacitance, prevents to lose efficacy because of saturated after isolating transformer T1 is by direct current.The pulse signal on the former limit of isolating transformer T1 is given secondary by isolating transformer T1, after pulse signal process diode D3 rectification, capacitor C 3 filtering, forms direct voltage.The direct voltage that forms drives triode Q2 by driving resistor R7, and control MOSFET pipe Q1 turns on and off, and reaches the purpose of control veneer power-on and power-off.
The structural representation of the veneer that Fig. 5 provides for the embodiment of the invention.Described veneer comprises the device 51 and the load 52 of control veneer power-on and power-off.The power-on and power-off of device 51 control loads 52 of control veneer power-on and power-off, the operation principle of the device 51 of control veneer power-on and power-off see above-mentioned Fig. 3, explanation embodiment illustrated in fig. 4 for details.
The structural representation of the communication apparatus that Fig. 6 provides for the embodiment of the invention.Described communication apparatus comprises control module 61 and veneer 62.Send control signal PWRCtrl in control module 61, veneer 62 power-on and power-off under the control of control signal PWRCtrl.Veneer 62 sees above-mentioned explanation embodiment illustrated in fig. 5 for details.
A kind of flow chart of controlling the method for veneer power-on and power-off that Fig. 7 provides for the embodiment of the invention.Described method comprises:
When the low-pressure side control signal was level signal, described low-pressure side control signal is converted to the high-pressure side control signal can be comprised: adopt the light-coupled isolation device that described control signal is converted to the high-pressure side control signal, see above-mentioned explanation embodiment illustrated in fig. 3 for details.
When the low-pressure side control signal was pulse signal, described low-pressure side control signal is converted to the high-pressure side control signal can be comprised: adopt isolating transformer that described control signal is converted to the high-pressure side control signal, see above-mentioned explanation embodiment illustrated in fig. 4 for details.
Said apparatus, veneer, Apparatus and method for embodiment, by increasing simple Signal Spacing control circuit in the existing power supply soft-start circuit of veneer periphery, utilize turning on and off of Signal Spacing control circuit control power supply soft-start circuit, thereby realized the power-on and power-off control of veneer.Simultaneously, the Signal Spacing control circuit of increase does not influence the original function of power supply soft-start circuit, realize that cost is low, reliability is high, and volume is little, conserve space.When control signal PWRCtrl lost efficacy or broke down, do not influence the operate as normal of power supply soft-start circuit yet.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a device of controlling the veneer power-on and power-off comprises the power supply soft-start circuit, it is characterized in that, also comprises:
The Signal Spacing control circuit, described Signal Spacing control circuit is connected with described power supply soft-start circuit;
Described Signal Spacing control circuit is used for the low-pressure side control signal is converted to the high-pressure side control signal, and isolates described low-pressure side control signal and high-pressure side control signal;
Described power supply soft-start circuit under the control of described high-pressure side control signal to Board Power up or down.
2. the device of control veneer according to claim 1 power-on and power-off is characterized in that, described Signal Spacing control circuit comprises:
The light-coupled isolation device is used to isolate described low-pressure side control signal and high-pressure side control signal;
Control circuit, being used in described low-pressure side control signal is under the situation of high level, controls the collector and emitter saturation conduction of described light-coupled isolation device secondary, is under the load of veneer to control described power supply soft-start circuit shutoff; And to be used in described low-pressure side control signal be under the low level situation, and the collector and emitter of controlling described light-coupled isolation device secondary ends, and is that the load of veneer powers on to control the conducting of described power supply soft-start circuit.
3. the device of control veneer according to claim 2 power-on and power-off is characterized in that, described control circuit comprises:
Driving resistor, an end of described driving resistor is connected with the anode on the former limit of described light-coupled isolation device, and the other end connects the control module that is used to send described low-pressure side control signal;
Pull down resistor, an end of described pull down resistor is connected other end ground connection with the anode on the former limit of described light-coupled isolation device;
Filter capacitor, an end of described filter capacitor is connected other end ground connection with the anode on the former limit of described light-coupled isolation device.
4. the device of control veneer according to claim 1 power-on and power-off is characterized in that, described Signal Spacing control circuit comprises:
Isolating transformer, the former limit of described isolating transformer is used to receive described low-pressure side control signal;
Change-over circuit, described change-over circuit is connected with the secondary of described isolating transformer, is used for described low-pressure side control signal is converted to described high-pressure side control signal.
5. the device of control veneer according to claim 4 power-on and power-off is characterized in that, described change-over circuit comprises:
Diode, the anode of described diode links to each other with the secondary of described isolating transformer end of the same name;
Filter capacitor, an end of described filter capacitor is connected with the negative electrode of described diode, and the other end is connected with the secondary end of the same name of described isolating transformer;
Driving resistor, an end of described driving resistor is connected with the negative electrode of described diode;
Triode, the base stage of described triode is connected with the other end of described driving resistor, collector electrode is connected with the gate driving resistance of field effect transistor in the described power supply soft-start circuit, and the source electrode of field effect transistor is connected in the secondary end of the same name of emitter and described isolating transformer and the described power supply soft-start circuit.
6. the device of control veneer according to claim 5 power-on and power-off is characterized in that described change-over circuit also comprises: current-limiting resistance; The collector electrode of described triode is connected with the gate driving resistance of field effect transistor in the described power supply soft-start circuit by described current-limiting resistance.
7. a veneer is characterized in that, comprising: aforesaid right requires the device of each described control veneer power-on and power-off among the 1-6.
8. a communication apparatus is characterized in that, comprising: aforesaid right requires 7 described veneers.
9. a method of controlling the veneer power-on and power-off is characterized in that, comprising:
Receive the low-pressure side control signal;
Described low-pressure side control signal is converted to the high-pressure side control signal, and isolates described low-pressure side control signal and high-pressure side control signal;
Utilize described high-pressure side control signal control power supply soft-start circuit to open or turn-off.
10. the method for control veneer according to claim 9 power-on and power-off is characterized in that, described low-pressure side control signal is converted to the high-pressure side control signal comprises:
Adopt the light-coupled isolation device that described low-pressure side control signal is converted to the high-pressure side control signal; Or
Adopt isolating transformer that described low-pressure side control signal is converted to the high-pressure side control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910089980 CN101989852B (en) | 2009-07-30 | 2009-07-30 | Single board, communication equipment, device for controlling power on/off of single board and method thereof |
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| CN 200910089980 CN101989852B (en) | 2009-07-30 | 2009-07-30 | Single board, communication equipment, device for controlling power on/off of single board and method thereof |
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| CN101989852B CN101989852B (en) | 2013-01-02 |
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| CN201222650Y (en) * | 2008-06-20 | 2009-04-15 | 石家庄博发科技有限公司 | Apparatus for monitoring and protecting power distribution of transformer house |
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