CN103366214B - Power control circuit and power control method - Google Patents
Power control circuit and power control method Download PDFInfo
- Publication number
- CN103366214B CN103366214B CN201210104914.3A CN201210104914A CN103366214B CN 103366214 B CN103366214 B CN 103366214B CN 201210104914 A CN201210104914 A CN 201210104914A CN 103366214 B CN103366214 B CN 103366214B
- Authority
- CN
- China
- Prior art keywords
- circuit
- power
- power supply
- voltage
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a kind of power control circuit and power control method, including power selection circuit, on-off circuit, at least two-way power supply input circuit and ON-OFF control circuit and voltage detecting circuit；Power selection circuit selects a road to export as power supply according to the first preset rules from each power output circuit；The outfan of on-off circuit is power output end, and outfan and the outfan of each power supply input circuit of power selection circuit are connected with the input of on-off circuit；Voltage detecting circuit is for detecting power output end voltage and the output end voltage of at least one road power supply input circuit, ON-OFF control circuit selects a road to connect with power output end according to voltage detecting output control on-off circuit from the outfan of power selection circuit with the outfan of each power supply input circuit, all the time powered by same port output voltage inside circuit, it is to avoid occur that multiple-way supply is joined directly together the problems such as interference and the electric leakage of generation.
Description
Technical field
The present invention relates to circuit field, particularly relate to a kind of power control circuit and power control method.
Background technology
For the RFID label chip of active/passive working in double modes, the power supply of its internal circuit has two selections, external power supply or the RF signal received carries out rectification obtain power supply.As there is two-way power supply in microwave radio identification (UHFRFID) label chip: a road is external power supply, and another road is the DC voltage by obtaining after over commutation circuit rectifies after antenna induction.Needing to design a dual power supply in chip design and select control circuit, select the road power supply input power supply wherein having power supply according to the electric power thus supplied of two-way power supply, output voltage is supplied to subsequent conditioning circuit and uses.
Existing Application comparison dual-supply voltage selection circuit widely is as shown in Figure 1: this circuit defaults is for be powered by VCC2, by the voltage detecting and controling circuit being electrically connected with it, external power supply VCC1 decides whether that closing SW switch is powered.This dual-supply voltage selection circuit there is problems in that 1. when VCC1 voltage is relatively low, voltage detecting and controling circuit work is abnormal, causes the logic of output error, easily occurs when VCC1 is also not reaching to expection voltage, the misoperations such as SW has opened the most, cause some starting problems；2. after SW closes, VCC1, VCC2 duplex feeding power supply is joined directly together, and can there is interference and electric leakage.
Summary of the invention
The main technical problem to be solved in the present invention is to provide a kind of power control circuit and power control method.
For solving above-mentioned technical problem, the present invention provides a kind of power control circuit, including power selection circuit, on-off circuit, ON-OFF control circuit, voltage detecting circuit and multiple power supplies input circuit；The outfan of each power supply input circuit all inputs with described power selection circuit are connected, and described power selection circuit is for selecting a road to export as power supply according to the first preset rules from described each power supply input circuit；The outfan of described power selection circuit and the outfan of described each power supply input circuit all inputs with described on-off circuit are connected；The outfan of described on-off circuit is the power output end of described power control circuit；Described voltage detecting circuit one end is connected with the outfan of power supply input circuit described in described power output end and at least one tunnel, the other end is connected with described ON-OFF control circuit, described voltage detecting circuit is for detecting the output end voltage of power supply input circuit described in described power output end voltage and at least one tunnel, and testing result is transferred to described ON-OFF control circuit；Described ON-OFF control circuit is connected with described on-off circuit, and described on-off circuit, under the control of described ON-OFF control circuit, selects a road to be connected with described power output end from described power selection circuit and described each power supply input circuit.
In a kind of embodiment of invention, described on-off circuit includes that multi-channel switch module, described each way switch unit are connected with described power selection circuit and each road power supply input circuit respectively, and described each way switch unit works under the control of described ON-OFF control circuit.
In a kind of embodiment of invention, described voltage detecting circuit includes that an input voltage measurement electronic circuit, described voltage detecting electronic circuit and a road power supply input circuit connect, for detecting the output voltage of corresponding power input circuit.
In a kind of embodiment of invention, described voltage detecting circuit includes that multiple input voltage measurement electronic circuit, each input voltage measurement electronic circuit are connected with each power supply input circuit respectively, for detecting the output voltage of each power supply input circuit.
In a kind of embodiment of invention, described power control circuit includes two-way power supply input circuit.
In a kind of embodiment of invention, described power selection circuit selects a road to include as output according to the first preset rules from described each power supply input circuit: described power selection circuit selects output voltage Gao mono-tunnel as output from described each power supply input circuit.
In a kind of embodiment of invention, described voltage detecting circuit includes electrification reset electronic circuit and lower electro-detection electronic circuit, one end of described electrification reset electronic circuit and one end of lower electro-detection electronic circuit are all connected with described power output end, and the other end is all connected with described ON-OFF control circuit.
Present invention also offers a kind of power control method based on power control circuit as above, comprise the following steps:
Voltage detecting circuit detection power output end voltage and the output end voltage of at least one road power supply input circuit, be sent to ON-OFF control circuit by testing result；
ON-OFF control circuit controls described on-off circuit according to described testing result and selects a road to be connected with described power output end from described power selection circuit and described power supply input circuit.
In a kind of embodiment of invention, ON-OFF control circuit controls described on-off circuit according to described testing result and selects a road to be connected with described power output end from described power selection circuit and described power supply input circuit to include:
When described testing result is power output end voltage less than the second predeterminated voltage, ON-OFF control circuit controls on-off circuit according to described testing result and is connected with described power output end by the outfan of power selection circuit；
When described testing result is that power output end voltage is more than or equal to the second predeterminated voltage, when the output end voltage of at least one road power supply input circuit is more than or equal to the first predeterminated voltage, from the output end voltage power supply input circuit more than or equal to the first predeterminated voltage, selects a road by the second preset rules be connected with described power output end.
Invention a kind of embodiment in, described second preset rules particularly as follows:
When described testing result is that power output end voltage is more than or equal to the second predeterminated voltage, and when the output end voltage of only one road power supply input circuit is more than or equal to the first predeterminated voltage, this road power supply input circuit is selected to be connected with described power output end；
When described testing result is that power output end voltage is more than or equal to the second predeterminated voltage, and when having the output end voltage of at least two-way power supply input circuit to be more than or equal to the first predeterminated voltage, select a road to be connected with described power output end by the power supply priority of each power supply input circuit order from high to low.
In a kind of embodiment of invention, select after a road power supply input circuit is connected with described power output end, also include: described ON-OFF control circuit judges whether the power supply priority of the power supply input circuit being currently connected with described power output end is limit priority；As no, then whether notice voltage detecting circuit continues other high power supply input circuit output end voltages of detection power supply this power supply input circuit of priority ratio more than or equal to the first predeterminated voltage, and select a road to be connected with described power output end from the power supply input circuit that voltage detecting circuit detects by power supply priority order from high to low, disconnect the power supply input circuit being currently connected with described power output end.
The invention has the beneficial effects as follows: the power control circuit in the present invention includes power selection circuit, on-off circuit, multiple power supplies input circuit and ON-OFF control circuit and voltage detecting circuit；Power selection circuit is for selecting a road power supply output according to the first preset rules from each power supply input circuit；The outfan of on-off circuit is power output end, and the outfan of power selection circuit and the outfan of described each power supply input circuit are all connected with the input of on-off circuit；Voltage detecting circuit is connected with the outfan of power output end and at least one road power supply input circuit, for detecting power output end voltage and the output end voltage of at least one road power supply input circuit, ON-OFF control circuit selects a road to connect with power output end according to voltage detecting output control on-off circuit from the outfan of power selection circuit with the outfan of each power supply input circuit, therefore, the present invention can detect power source automatically, choose according to testing result and effectively input power supply, all the time powered by same port output voltage inside circuit, there is not the situation that major-minor two-way power supply is powered simultaneously, avoid the occurrence of the problems such as the multiple-way supply interference and the electric leakage that are joined directly together generation.
Accompanying drawing explanation
A kind of dual-supply voltage selection circuit schematic diagram that Fig. 1 provides for prior art；
Fig. 2 is the power control circuit structural representation in the embodiment of the present invention one；
Fig. 3 is the power control circuit structural representation in the embodiment of the present invention two；
Fig. 4-Fig. 5 is the power control circuit structural representation one in the embodiment of the present invention three；
Fig. 6 is the power control circuit structural representation two in the embodiment of the present invention three；
Fig. 7 is the power control circuit structural representation three in the embodiment of the present invention three；
Fig. 8 is the power control circuit structural representation four in the embodiment of the present invention three；
Fig. 9 is the power control circuit structural representation five in the embodiment of the present invention three.
Detailed description of the invention
Combine accompanying drawing below by detailed description of the invention the present invention is described in further detail.
Embodiment one:
Referring to the power control circuit in Fig. 2, this example and include power selection circuit, on-off circuit, ON-OFF control circuit, voltage detecting circuit and n road power supply input circuit, n is integer, more than or equal to 2.
The outfan of each power supply input circuit is all connected with power selection circuit.
Power selection circuit is for selecting a road power supply according to the first preset rules stored in the inner from each power supply input circuit.The outfan of power selection circuit is connected with the input of on-off circuit.This first preset rules can be selection output voltage values Gao mono-tunnel from each power supply input circuit, or for selecting output voltage from each power supply input circuit equal to the road presetting magnitude of voltage, or output voltage is on range of voltage values Nei mono-tunnel set in advance, specifically arranging rule can select according to practical situation.The power output end that outfan is whole power control circuit of this example breaker in middle circuit, it is for connecting with corresponding operational module, for its input power.The outfan of power selection circuit is also connected with the input of on-off circuit.
Voltage detecting circuit is connected with the outfan of power output end and at least one road power supply input circuit, for detecting power output end voltage and the output end voltage of at least one road power supply input circuit, and testing result is transferred to ON-OFF control circuit.In voltage detecting circuit, storage has the first preset voltage value and the second preset voltage value.First preset voltage value is the startup threshold value of power supply input circuit, i.e. when power supply input circuit output voltage values being detected more than or equal to the first preset voltage value, shows that this power supply input circuit has electricity, can be as power supply.Second preset voltage value is the burning voltage threshold value of the power output end of whole power control circuit, when magnitude of voltage power output end being detected is less than burning voltage threshold value, shows the startup stage that the power supply input circuit currently powered being in or is in the lower electricity stage；When the magnitude of voltage of power output end of whole power control circuit being detected more than or equal to burning voltage threshold value, then show that this power control circuit is in the stable power-supplying stage；When detecting that the magnitude of voltage of power output end by when being less than voltage stabilization threshold value more than or equal to burning voltage threshold transitions, then shows that this power control circuit is in the lower electricity stage.The value of the first preset voltage value in the present embodiment may be configured as equal with the second preset voltage value, may be alternatively provided as less than the second preset voltage value, specifically can arrange and can select according to practical situation, the value being preferably the first preset voltage value in the present embodiment is less than the second preset voltage value.
ON-OFF control circuit is connected with on-off circuit, testing result for receiving according to it controls on-off circuit and selects a road to connect with power output end from the outfan of power selection circuit with the outfan of each power supply input circuit, i.e. select a road power supply as input power, on-off circuit in this example includes multi-channel switch module, each way switch unit is connected with power selection circuit and each road power supply input circuit respectively, and each way switch works under the control of ON-OFF control circuit.
The power supply priority of at least two-way power supply input circuit that the power control circuit in this example includes differs, and i.e. can arrange the power supply priority of the multiple power supplies input circuit that power control circuit includes in this example.Such as, when including three-way power input circuit, the power supply priority on Jiang Zhe tri-tunnel respectively can be set to 1,2,3, numeral is the least, and priority is the highest.
Voltage detecting circuit includes input voltage measurement electronic circuit.Other power supply input circuits in addition to the power supply minimum power supply input circuit of priority are respectively equipped with a voltage detecting electronic circuit, for detecting the output voltage of the power supply input circuit of correspondence.Such as, in previous example, it is only necessary to arrange input voltage measurement electronic circuit on the power supply input circuit that priority is 1,2, because when power supply, if detecting when not having electricity on the power supply input circuit that priority is 1,2, the most necessarily priority be 3 power supply input circuit on have electricity.Just because of the setting of this priority method for controlling power supply, the number that input voltage measurement electronic circuit is set can be reduced, thus area can be saved, simplify the structure of power control circuit, reduce cost.Certainly, a voltage detecting electronic circuit can be respectively provided with on each power supply input circuit that power control circuit includes according to actual needs, for detecting the output voltage of each power supply input circuit.
In other embodiments, voltage detecting circuit may also include electrification reset electronic circuit and the lower electro-detection electronic circuit that power output end with whole power control circuit respectively is connected.Electrification reset electronic circuit then for detect power output end startup stage in change in voltage situation, when the voltage measured is less than the second preset voltage value, show whole power control circuit also in startup stage, when the voltage detected is more than or equal to the second preset voltage value, show that whole power control circuit is in the stable power-supplying stage.Lower electro-detection electronic circuit is used for detecting whether power output end is switched to the lower electricity stage by the stable power-supplying stage, as detected, the voltage of power output end is by when being changed into less than the second preset voltage value more than or equal to the second predeterminated voltage, then it is assumed that whole power control circuit is switched to the lower electricity stage by the stable power-supplying stage.
ON-OFF control circuit controls on-off circuit according to this testing result and selects a road to connect with power output end from the outfan of power selection circuit with the outfan of power supply input circuit, and specifically chosen process is as follows:
When the power output end voltage that testing result is whole power control circuit is less than the second preset voltage value, showing the startup stage that the most whole power control circuit being in or be in the lower electricity stage, ON-OFF control circuit controls on-off circuit according to this testing result and is connected with power output end by the outfan of power selection circuit；Now only have power selection circuit to connect with power output end, i.e. startup stage or the lower electric stage, the most only one road power supply is that this circuit is powered；And this power supply is the road power supply selected from each power supply input circuit according to the first preset rules；When the testing result received is that power output end voltage is more than or equal to the second predeterminated voltage, and at least one road power supply input circuit output end voltage more than or equal to the first predeterminated voltage time, from the output end voltage power supply input circuit more than or equal to the first predeterminated voltage, select a road by the second preset rules be connected with power output end, as power supply；Above-mentioned second preset rules particularly as follows:
When testing result is that power output end voltage is more than or equal to the second predeterminated voltage, and only one road power supply input circuit output end voltage more than or equal to the first predeterminated voltage time, this road power supply input circuit is selected to be connected with power output end, i.e. ON-OFF control circuit sends control signal to on-off circuit, controlling on-off circuit to be connected with power output end by this power supply input circuit, power selection circuit and other power supply input circuits then disconnect with power output end；
When testing result is that power output end voltage is more than or equal to the second predeterminated voltage, and when having the output end voltage of at least two-way power supply input circuit to be more than or equal to the first predeterminated voltage, selecting a road from these power supply input circuits by power supply priority order from high to low to be connected with power output end, power selection circuit and other power supply input circuits then disconnect with power output end.
In this example, after ON-OFF control circuit control on-off circuit selects a road power supply input circuit to be connected with power output end, i.e. in the stable power-supplying stage, also include: ON-OFF control circuit judges whether the power supply priority of the power supply input circuit being currently connected with power output end is limit priority (the power supply priority of each power supply input link can be stored in advance in ON-OFF control circuit)；If not being for limit priority, then whether notice voltage detecting circuit continues other high power supply input circuit output end voltages of detection power supply this power supply input circuit of priority ratio more than or equal to the first predeterminated voltage, and select a road to be connected with power output end from the power supply input circuit that voltage detecting circuit detects by power supply priority order from high to low, disconnect the power supply input circuit being currently connected with power output end, i.e. in the stable power-supplying stage in this example, also include selecting, the process of switching optimal power power supply, to reach best control electricity effect.
Embodiment two:
Referring to Fig. 3. the power control circuit that this example provides includes two-way power supply input circuit, the respectively first power supply input circuit and second source input circuit.Voltage detecting circuit includes the input voltage measurement electronic circuit being connected with the outfan of second source input circuit.When the voltage that in this example, setting input voltage measurement electronic circuit detects is more than or equal to the first preset voltage value, export high level 1；Otherwise, output low level 0.Certainly, voltage detecting circuit may also comprise two input voltage measurement electronic circuits that outfan with the first power supply input circuit and second source input circuit is connected respectively, to detect the voltage condition of two-way power supply input circuit respectively.This example is chosen former method to set up, i.e. only input voltage measurement electronic circuit is set on second source input circuit.Preferably, by above-mentioned according to power supply priority screening technique, can arrange the priority of two-way power supply input circuit, it arranges second source input circuit is height power supply priority power supply input circuit, and the priority of the first power supply input circuit is then low than second source input circuit priority；Input voltage measurement electronic circuit is connected with second source input circuit i.e. height power supply priority power supply input circuit.
Voltage detecting circuit also includes the electrification reset electronic circuit that is connected respectively and lower electro-detection electronic circuit with power output end, electrification reset electronic circuit then for detect power output end startup stage in change in voltage situation, when the voltage measured is less than the second preset voltage value, show also in startup stage, the output now setting electrification reset electronic circuit and lower electro-detection electronic circuit is all low level 00；Otherwise, the two is output as high level 11；Lower electro-detection electronic circuit is used for detecting whether power output end has the stable power-supplying stage to switch to the lower electricity stage, when voltage as detected is less than the second preset voltage value, then thinking and switched to the lower electricity stage by the stable power-supplying stage, the output now setting electrification reset electronic circuit and lower electro-detection electronic circuit is all low level 00；Otherwise, the two is output as high level 11.The burning voltage threshold value it should be noted that the startup stage that decision circuitry being in this example and use during the lower electricity stage may be configured as using different voltage thresholds.Based on the circuit shown in Fig. 3, its power control procedure is specific as follows:
Startup stage, electrification reset electronic circuit detects that the voltage of power output end is less than the second preset voltage value, showing the startup stage that circuit being in, the now output of electrification reset electronic circuit and lower electro-detection electronic circuit is all low level, i.e. the two output is 00 to the testing result of ON-OFF control circuit；
ON-OFF control circuit receives the testing result that electrification reset electronic circuit and lower electro-detection electronic circuit send when being 00, the testing result then no matter being connected the transmission of input voltage measurement electronic circuit with second source input circuit is 0 or 1, directly send control signal to be connected with output port of power source by the outfan of power selection circuit to on-off circuit, control on-off circuit.The voltage of now power selection circuit output provides for the Gao mono-of magnitude of voltage in two-way power supply input circuit tunnel, the magnitude of voltage that now voltage of output port of power source is current equal to this road power input voltage；
When power input voltage gradually rises, the voltage of output port of power source also gradually rises, when electrification reset electronic circuit detects the voltage of power output end more than or equal to the second preset voltage value, show that now circuit comes into the stable power-supplying stage, the output of electrification reset electronic circuit and lower electro-detection electronic circuit is all low level, i.e. the two output is 11 to the testing result of ON-OFF control circuit；
ON-OFF control circuit receives the testing result that electrification reset electronic circuit and lower electro-detection electronic circuit send when being 11, determines whether that the testing result being connected the transmission of input voltage measurement electronic circuit with second source input circuit is 0 or 1；When the testing result that input voltage measurement electronic circuit sends is 1, send control signal to on-off circuit, the outfan of deenergization selection circuit and the connection of output port of power source, and select this second source input circuit to be connected with output port of power source；When the testing result that input voltage measurement electronic circuit sends is 0, show that the current voltage of second source input circuit is not up to the first preset voltage value, the most then infer and now really powered by the first power supply input circuit, send control signal to on-off circuit, the outfan of deenergization selection circuit and the connection of output port of power source, and the power supply input circuit selecting this priority relatively low is connected with output port of power source；
In the stable power-supplying stage, judge when the power supply priority of power supply input circuit that is currently connected with output port of power source is the highest, the input voltage measurement electronic circuit of voltage detection unit continues the detection high priority power supply input circuit i.e. output voltage of second source input circuit, when output voltage high priority power supply input circuit being detected is more than the first preset voltage value, when the testing result that input voltage measurement electronic circuit sends is 1, ON-OFF control circuit sends control signal to on-off circuit, disconnect the outfan of relatively low power supply input circuit that is first power supply input circuit of priority and the connection of output port of power source, and select this high priority power supply input circuit to be connected with output port of power source, reach the selection that optimal route is powered, switching effect；
The lower electricity stage, instantly electro-detection electronic circuit detects that the voltage of power output end is by when being transformed into less than the second preset voltage value more than or equal to the second preset voltage value, the electricity stage under showing at circuit, the now output of electrification reset electronic circuit and lower electro-detection electronic circuit is all low level, i.e. the two output is 00 to the testing result of ON-OFF control circuit；
ON-OFF control circuit receives the testing result that electrification reset electronic circuit and lower electro-detection electronic circuit send when being 00, show that circuit is the lower electricity stage by stable power-supplying transition stage, now regardless of be connected with second source input circuit input voltage measurement electronic circuit send testing result be 0 or 1, directly send control signal to on-off circuit, control on-off circuit to be connected with output port of power source by the outfan of power selection circuit, the power supply input circuit being currently connected with output port of power source is disconnected；From the foregoing, it will be observed that the voltage of now power selection circuit output is still what magnitude of voltage Gao mono-tunnel in two-way power supply input circuit provided, along with the decline of this road supply voltage, the voltage of output port of power source is also with decline, electric under circuit.
Embodiment three:
This example is as a example by concrete circuit realiration, and the present invention is described further.
Refer to Fig. 4 and Fig. 5, Fig. 4 and Fig. 5 is a complete power control circuit, shown power control circuit includes two-way power supply input circuit VCC1, VCC2, also include power selection circuit Vini, in this example, power selection circuit Vini is for selecting voltage relatively Gao mono-tunnel as output from VCC1, VCC2, its implementation includes multiple, as shown in Figure 6, power selection circuit Vini in Fig. 6 is made up of PMOS P1 and P2, in selecting two-way to input by P1, P2, compare Gao mono-tunnel exports, thus realizes power supply and select function.Three switch SW_1, SW_2 and SW_B compositions that on-off circuit in this example includes being separately positioned on VCC1, VCC2 and Vini branch road, the outfan of on-off circuit be VDD, i.e. VDD be power output end.The priority of the priority ratio VCC2 setting VCC1 in this example is high, when record VCC1 and VCC2 has electricity, preferably selects VCC1 and powers.VCC1 arranges input voltage measurement electronic circuit SrcDet, for detecting the output voltage of VCC1, output detections result VCC1EN.Power output end is provided with electrification reset electronic circuit POR and lower electro-detection electronic circuit VD, for detecting the magnitude of voltage of power output end VDD, the startup stage of whether being in decision circuitry or lower electricity stage, output detections result POR and VD.Refer to Fig. 5, input voltage measurement electronic circuit SrcDet, electrification reset electronic circuit POR and lower electro-detection electronic circuit VD output detections result VCC1EN, POR and VD are to ON-OFF control circuit control, ON-OFF control circuit control controls switch SW_1, SW_2 and SW_B according to VCC1EN, POR and VD these three logical message number, specific as follows:
Startup stage, vdd voltage is detected by POR and VD, now VDD is low level, POR and VD output signal 00, when control logical signal POR and VD is 00, sending control signal corresponding ctrl1, ctrl2, ctrl3 respectively is 100, i.e. controlling SW_B to shut, switch SW_1, SW_2 disconnect, and VDD and power selection circuit Vini output is connected, power selection circuit Vini selects compare Gao mono-tunnel to export by the input of VCC1 and VCC2 two-way, i.e. the voltage of VDD is high voltage between VCC1 and VCC2.
When input power gradually rises, vdd voltage raises, POR and VD signal is uprised by low, input voltage measurement electronic circuit SrcDet detects VCC1, when vdd voltage reaches the second preset voltage value, the output signal of POR and VD is 11, and ON-OFF control circuit control judges now whether signal VCC1EN is high level 1, in this way, then sending control signal corresponding ctrl1, ctrl2, ctrl3 respectively is 010, controls switch SW_B and disconnects, and VCC1EN is that high VCC1 has electricity, switch SW_1 shuts, and SW_2 disconnects；Otherwise, then sending control signal corresponding ctrl1, ctrl2, ctrl3 respectively is 001, control switch SW_B to disconnect, VCC1EN is low, and VCC1 disconnects without electricity, switch SW_1, SW_2 shuts, the most directly being powered to VDD by VCC1 or VCC2, circuit power selection circuit power switching is directly powered to power supply input circuit VCC1 or VCC2, and circuit stability works.
Circuit stability working stage, when be currently VCC2 be its power supply time, owing to the priority ratio VCC1 of VCC2 is low, therefore when input voltage measurement electronic circuit SrcDet detection VCC1 has electricity, output signal VCC1EN is high level 1, the most now VCC1 and VCC2 all has electricity, now ON-OFF control circuit control output signal control switch SW_1 to shut, and SW_2 disconnects；Reach two-way when all having electricity, select priority Gao mono-tunnel to be powered.
The lower electricity stage, when electricity under the power supply input circuit (being set to VCC1) of current power supply, VDD output voltage reduces, POR and VD detection VDD output voltage is less than the second preset voltage value, output detections result is 00, input voltage measurement electronic circuit SrcDet output signal VCC1EN is also low level, control SW_B now by ON-OFF control circuit control to shut, switch SW_1, SW_2 disconnect, vdd voltage power selection circuit Vini exports offer, along with VCC1 output voltage declines, VDD output voltage declines the most therewith, electricity under circuit.
From the foregoing, it will be observed that the dual power supply control circuit provided in this example at least has the advantage that
(1) startup stage, the simple selection circuit in Xian Yong mono-tunnel selects a road output from two-way power supply input circuit, after circuit enters the stable power-supplying stage, the control mode that a road powers the most finally is selected again after ON-OFF control circuit judges duplex feeding situation, and the purpose switched is reached by on-off circuit, there is not the situation that circuit cannot start.
(2) have only to arrange input voltage measurement electronic circuit on the power supply input circuit that priority is high, it is not required on every power supply input circuit, arrange input voltage measurement electronic circuit (certainly, input voltage measurement electronic circuit also can be set on every power supply input circuit, refer to Fig. 7, in Fig. 7, input voltage measurement electronic circuit SrcDet1's and SrcDet2 is sent to ON-OFF control circuit by testing result, the method that ON-OFF control circuit controls each switch is essentially identical with said method, do not repeat them here), i.e. by a road input voltage measurement electronic circuit, this example only can judge that power supply inputs, save area, simplify structure.
(3) on-off control is all passed through in the outfan of power selection circuit and the connection of two-way power supply input circuit degree power output end, and it is open-minded that any stage in the course of the work the most only selectes a road, thus avoids interfering with each other between power supply.
(4) use multiple power supplies two priority classes, automatically check power source, it is achieved there is the power supply input circuit that can automatically switch to priority at any time high when two-way power supply is powered and be powered, power more stable, reliable.
The power control circuit provided in the present invention is not limited in above-mentioned dual power supply control circuit, is also not limited to the situation of only one of which output port of power source, according to practical situation, can arrange three road input powers or the power control circuit of more than three；May also set up multiple output port of power source, as shown in Figure 7 and Figure 8:
In Fig. 8, Fig. 8 is the application showing in three input power circuit, circuit start is realized by power selection circuit Vini, export to the testing result of ON-OFF control circuit according to two input voltage measurement electronic circuit SrcDet1 and SrcDet2 and electrification reset circuit POR and the testing circuit VD that places an order, each branch road and the connection of power output end and disconnection is controlled, it is achieved different powering phase selects corresponding power supply to be powered by simple logic control signal.Simultaneously, the priority of input power circuit VCC1, VCC2 and VCC3 can be set, the priority being such as set to VCC1 is the highest, VCC2 is secondly, VCC3 is minimum, then in the stable power-supplying stage, there is multichannel input power circuit when having electricity, optimum input power circuit can be selected to switch over, power according to the order of above priority.
Fig. 9 is a kind of concrete application of the dual power supply output in this example, by increasing by a way switch SWA and increasing a power output end VDDA, the out-put supply of power control circuit can be divided into two kinds, power to respectively chip internal analog portion and numerical portion, it is to avoid interfering with each other between two-way out-put supply.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert the present invention be embodied as be confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (11)
1. a power control circuit, it is characterised in that include power selection circuit, on-off circuit, ON-OFF control circuit, voltage detecting circuit and multiple power supplies input circuit；The outfan of each power supply input circuit all inputs with described power selection circuit are connected, and described power selection circuit is for selecting a road to export as power supply according to the first preset rules from described each power supply input circuit；The outfan of described power selection circuit and the outfan of described each power supply input circuit all inputs with described on-off circuit are connected；The outfan of described on-off circuit is the power output end of described power control circuit；Described voltage detecting circuit one end is connected with the outfan of power supply input circuit described in described power output end and at least one tunnel, the other end is connected with described ON-OFF control circuit, described voltage detecting circuit is for detecting the output end voltage of power supply input circuit described in described power output end voltage and at least one tunnel, and testing result is transferred to described ON-OFF control circuit；Described ON-OFF control circuit is connected with described on-off circuit, and described on-off circuit, under the control of described ON-OFF control circuit, selects a road to be connected with described power output end from described power selection circuit and described each power supply input circuit.
2. power control circuit as claimed in claim 1, it is characterized in that, described on-off circuit includes that multi-channel switch module, described each way switch unit are connected with described power selection circuit and each road power supply input circuit respectively, and described each way switch unit works under the control of described ON-OFF control circuit.
3. power control circuit as claimed in claim 1, it is characterized in that, described voltage detecting circuit includes that an input voltage measurement electronic circuit, described voltage detecting electronic circuit and a road power supply input circuit connect, for detecting the output voltage of corresponding power input circuit.
4. power control circuit as claimed in claim 1, it is characterized in that, described voltage detecting circuit includes that multiple input voltage measurement electronic circuit, each input voltage measurement electronic circuit are connected with each power supply input circuit respectively, for detecting the output voltage of each power supply input circuit.
5. the power control circuit as described in any one of claim 1-4, it is characterised in that described power control circuit includes two-way power supply input circuit.
6. the power control circuit as described in any one of claim 1-4, it is characterized in that, described power selection circuit selects a road to include as output according to the first preset rules from described each power supply input circuit: described power selection circuit selects output voltage Gao mono-tunnel as output from described each power supply input circuit.
7. the power control circuit as described in any one of claim 1-4, it is characterized in that, described voltage detecting circuit includes electrification reset electronic circuit and lower electro-detection electronic circuit, one end of described electrification reset electronic circuit and one end of lower electro-detection electronic circuit are all connected with described power output end, and the other end is all connected with described ON-OFF control circuit.
8. a power control method based on the power control circuit as described in any one of claim 1-7, it is characterised in that comprise the following steps:
Voltage detecting circuit detection power output end voltage and the output end voltage of at least one road power supply input circuit, be sent to ON-OFF control circuit by testing result；
ON-OFF control circuit controls described on-off circuit according to described testing result and selects a road to be connected with described power output end from described power selection circuit and described power supply input circuit.
9. power control method as claimed in claim 8, it is characterised in that ON-OFF control circuit controls described on-off circuit according to described testing result and selects a road to be connected with described power output end from described power selection circuit and described power supply input circuit to include:
When described testing result is power output end voltage less than the second predeterminated voltage, ON-OFF control circuit controls on-off circuit according to described testing result and is connected with described power output end by the outfan of power selection circuit；
When described testing result is that power output end voltage is more than or equal to the second predeterminated voltage, when the output end voltage of at least one road power supply input circuit is more than or equal to the first predeterminated voltage, from the output end voltage power supply input circuit more than or equal to the first predeterminated voltage, selects a road by the second preset rules be connected with described power output end.
10. power control method as claimed in claim 9, it is characterised in that described second preset rules particularly as follows:
When described testing result is that power output end voltage is more than or equal to the second predeterminated voltage, and when the output end voltage of only one road power supply input circuit is more than or equal to the first predeterminated voltage, this road power supply input circuit is selected to be connected with described power output end；
When described testing result is that power output end voltage is more than or equal to the second predeterminated voltage, and when having the output end voltage of at least two-way power supply input circuit to be more than or equal to the first predeterminated voltage, select a road to be connected with described power output end by the power supply priority of each power supply input circuit order from high to low.
11. power control methods as claimed in claim 10, it is characterized in that, select after a road power supply input circuit is connected with described power output end, also include: described ON-OFF control circuit judges whether the power supply priority of the power supply input circuit being currently connected with described power output end is limit priority；As no, then whether notice voltage detecting circuit continues other high power supply input circuit output end voltages of detection power supply this power supply input circuit of priority ratio more than or equal to the first predeterminated voltage, and select a road to be connected with described power output end from the power supply input circuit that voltage detecting circuit detects by power supply priority order from high to low, disconnect the power supply input circuit being currently connected with described power output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210104914.3A CN103366214B (en) | 2012-04-11 | 2012-04-11 | Power control circuit and power control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210104914.3A CN103366214B (en) | 2012-04-11 | 2012-04-11 | Power control circuit and power control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103366214A CN103366214A (en) | 2013-10-23 |
| CN103366214B true CN103366214B (en) | 2016-08-03 |
Family
ID=49367510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210104914.3A Active CN103366214B (en) | 2012-04-11 | 2012-04-11 | Power control circuit and power control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103366214B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807641B (en) * | 2014-12-29 | 2018-12-14 | 联想(北京)有限公司 | A kind of control method and electronic equipment |
| CN104503762A (en) * | 2014-12-30 | 2015-04-08 | 小米科技有限责任公司 | Device and method for identifying electronic accessory |
| CN105812199B (en) * | 2014-12-31 | 2020-06-30 | 青岛众海汇智能源科技有限责任公司 | Power supply permission preemption method for electric energy wireless transmission system and power supply equipment |
| CN105811593B (en) * | 2014-12-31 | 2020-12-29 | 青岛众海汇智能源科技有限责任公司 | Channel seizing method of electric energy wireless transmission system and power supply equipment |
| CN106655748B (en) * | 2015-11-02 | 2019-06-07 | 中国船舶重工集团公司第七二三研究所 | A kind of the power-up logic and protection circuit of two-way output DC power supply |
| WO2018161422A1 (en) * | 2017-03-10 | 2018-09-13 | 华为技术有限公司 | Power supply circuit and power supply method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277027A (en) * | 2008-02-22 | 2008-10-01 | 无锡紫芯集成电路系统有限公司 | Selection circuit for Single-chip integrated power supply |
| CN101557122A (en) * | 2009-02-24 | 2009-10-14 | 深圳市民展科技开发有限公司 | Duplicate supply selection circuit |
| CN201733131U (en) * | 2010-07-20 | 2011-02-02 | 国民技术股份有限公司 | Multiple-feed voltage regulator |
| CN202183634U (en) * | 2011-07-27 | 2012-04-04 | 常熟开关制造有限公司(原常熟开关厂） | Controller of change-over switch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050280447A1 (en) * | 2004-06-16 | 2005-12-22 | Curtis Susan A | Low voltage selection control circuit for dual power supply systems |
-
2012
- 2012-04-11 CN CN201210104914.3A patent/CN103366214B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277027A (en) * | 2008-02-22 | 2008-10-01 | 无锡紫芯集成电路系统有限公司 | Selection circuit for Single-chip integrated power supply |
| CN101557122A (en) * | 2009-02-24 | 2009-10-14 | 深圳市民展科技开发有限公司 | Duplicate supply selection circuit |
| CN201733131U (en) * | 2010-07-20 | 2011-02-02 | 国民技术股份有限公司 | Multiple-feed voltage regulator |
| CN202183634U (en) * | 2011-07-27 | 2012-04-04 | 常熟开关制造有限公司(原常熟开关厂） | Controller of change-over switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103366214A (en) | 2013-10-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103366214B (en) | Power control circuit and power control method | |
| US9800056B2 (en) | Multi-power supply system and control method thereof | |
| US9419807B2 (en) | PD in PoE system having redundant PSE channel inputs | |
| CN101102052B (en) | Power supply unit, power supply device and system and power supply method | |
| US9461484B2 (en) | Electricity storage system, method for controlling secondary battery packs, and secondary battery pack | |
| CN103326458B (en) | A kind of external power source and battery powered power supply switch circuit | |
| CN103782413A (en) | Battery having a brick architecture including cells arranged in series or in parallel | |
| CN102510122B (en) | Multi-power supply control devices and system thereof | |
| US10491033B2 (en) | Method for hot-plugging, control device for hot-plugging, method and device for voltage balance | |
| US20140103862A1 (en) | Power path switching in an electronic device including a plurality of charging ports | |
| CN103616827A (en) | Power source output device and power source output device control method | |
| CN208874344U (en) | Main power source and backup power source switching circuit and switching device | |
| CN104092277A (en) | Power supply circuit including bidirectional DC converter and control method thereof | |
| US11336091B2 (en) | Energy storage power supply, parallel control device for energy storage power supplies, and parallel control method for energy storage power supplies | |
| CN108631601A (en) | Multi input converter | |
| CN105510759A (en) | Electric leakage detection equipment and detection method thereof | |
| CN101931255B (en) | Charging management circuit | |
| CN202495738U (en) | Undervoltage protection circuit | |
| CN101999254B (en) | Switchable current supply for auxiliary current circuits in a current converter | |
| CN104838555B (en) | Alleviated by the power quality problem for mixing power grid | |
| CN109947010A (en) | A kind of active access feed control device, microstrip power divider and combiner | |
| CN104714581B (en) | Based on the star loaded camera power supply system of transformer | |
| CN108259030A (en) | A kind of switching device automatically according to input selection power path | |
| CN207706169U (en) | A kind of antenna tuner detection electrifying device | |
| CN207926260U (en) | A kind of multiple-way supply automatic switch-over circuit and supply unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |