CN203135728U - Voltage switching circuit and switch circuit - Google Patents
Voltage switching circuit and switch circuit Download PDFInfo
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- CN203135728U CN203135728U CN2012207399485U CN201220739948U CN203135728U CN 203135728 U CN203135728 U CN 203135728U CN 2012207399485 U CN2012207399485 U CN 2012207399485U CN 201220739948 U CN201220739948 U CN 201220739948U CN 203135728 U CN203135728 U CN 203135728U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a voltage switching circuit and a switch circuit. The voltage switching circuit comprises a current detection circuit, a current comparison circuit, a hysteresis comparison circuit, a voltage control circuit, and a voltage adjusting circuit, wherein the current detection circuit is connected with the hysteresis comparison circuit through the current comparison circuit; the hysteresis comparison circuit is connected with the voltage adjusting circuit through the voltage control circuit; the current comparison circuit compares the magnitudes of currents outputted by two output terminals of the current detection circuit and outputs feedback voltage corresponding to a current comparison result to the hysteresis comparison circuit; the hysteresis comparison circuit transmits a level signal corresponding to the feedback voltage to the voltage control circuit; and the voltage control circuit controls the voltage switching circuit through the voltage adjusting circuit to output voltage corresponding to the level signal. The voltage switching circuit controls the output of high and low voltages by virtue of detecting output currents under different working modes, thereby realizing the switching of the output of the high and low voltages, reducing the standby power consumption, simplifying the realization process, and decreasing the cost.
Description
Technical field
The utility model relates to power technique fields, relates in particular to a kind of voltage commutation circuit and switching circuit.
Background technology
Existing AV series products requires to have bluetooth under standby mode, the WIFI mobilizing function, this will cause the stand-by power consumption of power supply to increase, the power amplifier voltage of this series products generally requires than higher simultaneously, as 24V, 33V, if so high voltage is directly used the DC-DC(DC-to-DC converter) or LDO(Low Dropout Regulator, low pressure difference linear voltage regulator) transfers system standby voltage to, efficient can become very low so, can't satisfy the efficiency standard, and address the above problem traditional way be output one tunnel low-voltage as standby voltage, add power amplifier voltage as 5V, general with following two kinds of ways on circuit design like this:
The one, transformer secondary is provided with two windings, output two-way voltage, one road output HIGH voltage, another road output LOW voltage in addition, the intersection regulation that can the occur output voltage so non-constant that becomes, power consumption is still very high simultaneously, also is unfavorable for the flexible adjustment of power amplifier voltage.
The 2nd, design one group of stand-by circuit separately, need to use two PWM(Pulse Width Modulation, pulse width modulation like this) control integrated circuit, two transformers, directly cause cost to rise, as be applied to the adapter upper volume and also be restricted the implementation procedure more complicated.
Simultaneously, more than the output wire rod number of pins of two kinds of schemes require all often, two groups of voltages output of general adapter DC line the inside needs 5 cores above (wherein two-way voltage needs 4 cores just also will increase by one road control line), totally cost is all higher.
The utility model content
Main purpose of the present utility model is to propose a kind of voltage commutation circuit and switching circuit, is intended to be implemented in height two-way voltage and switches in the output procedure, reduces stand-by power consumption, reduces cost.
In order to achieve the above object, the utility model proposes a kind of voltage commutation circuit, this voltage commutation circuit comprises current detection circuit, current comparison circuit, hysteresis comparison circuit, voltage control circuit and voltage regulator circuit; Wherein:
Described current detection circuit is connected with described hysteresis comparison circuit by described current comparison circuit, described hysteresis comparison circuit is connected with described voltage regulator circuit by described voltage control circuit, the size of the electric current that two outputs of the more described current detection circuit of this current comparison circuit are exported, to the described hysteresis comparison circuit output feedback voltage corresponding with this electric current comparative result, this hysteresis comparison circuit sends the level signal corresponding with this feedback voltage to described voltage control circuit, and this voltage control circuit is controlled the described voltage commutation circuit output voltage corresponding with this level signal by described voltage regulator circuit.
Preferably, also comprise start protecting against shock circuit, an end of this start protecting against shock circuit is connected with described current comparison circuit, and the other end is connected with described hysteresis comparison circuit.
Preferably, described start protecting against shock circuit comprises diode, first resistance and first electric capacity; One end of described first electric capacity is connected with described current comparison circuit, and the other end is divided into two-way, and one the tunnel through described first grounding through resistance, and another road is connected with described hysteresis comparison circuit through described diode.
Preferably, described current detection circuit comprises second resistance, the 3rd resistance, the 4th resistance and the 5th resistance; Described second resistance and described the 3rd resistance parallel connection, the one common port is connected with an end of described the 4th resistance, another common port is connected with an end of described the 5th resistance, and the other end of described the 4th resistance is done and the other end of described the 5th resistance is connected to described current comparison circuit respectively.
Preferably, described current comparison circuit comprises first comparator, the 6th resistance and second electric capacity; Wherein:
The in-phase input end of described first comparator and inverting input all are connected with described current detection circuit, and its output is connected with described hysteresis comparison circuit, the earth terminal ground connection of described first comparator; Described the 6th resistance is connected between the inverting input and output of described first comparator, and described second electric capacity is in parallel with described the 6th resistance.
Preferably, described hysteresis comparison circuit comprises second comparator, first pressurizer, the 7th resistance, the 8th resistance and the 9th resistance; Wherein:
The in-phase input end of described second comparator is connected with described current comparison circuit, the inverting input of described second comparator is connected with negative electrode with the control utmost point of described first pressurizer respectively through described the 7th resistance, the output of described second comparator is connected with described voltage control circuit, and its power end is connected with the negative electrode of described first pressurizer through described the 8th resistance, the equal ground connection of the anode of the earth terminal of described second comparator and described first pressurizer, described the 9th resistance is connected between the in-phase input end and output of described second comparator.
Preferably, described voltage control circuit comprises triode and the tenth resistance; The base stage of described triode is connected with described hysteresis comparison circuit, the grounded emitter of described triode, and the collector electrode of described triode is connected with described voltage regulator circuit through described the tenth resistance.
Preferably, described voltage regulator circuit comprises second pressurizer, the 11 resistance, the 12 resistance, the 13 resistance, the 3rd electric capacity and the 4th electric capacity; Wherein, it is in parallel with described the 4th electric capacity after described the 3rd electric capacity is connected with described the 13 resistance, one end of described the 4th electric capacity is connected with the negative electrode of described second pressurizer, and the other end is connected the plus earth of described second pressurizer with the control utmost point of described second pressurizer; One end of described the 12 resistance is connected with the output of described voltage commutation circuit, and the other end is divided into three the tunnel, the one tunnel and is connected with the control utmost point of described second pressurizer, and one the tunnel is connected with described voltage control circuit, leads up to described the 11 grounding through resistance.
Preferably, described voltage commutation circuit also comprises input rectifying filter circuit, pwm control circuit, transformer and output rectifier and filter; Wherein, the input of described input rectifying filter circuit is connected with power input, and output is connected with the input of described pwm control circuit; The output of described pwm control circuit is connected with the elementary winding of described transformer, and the auxiliary winding of described transformer connects described pwm control circuit, and described Secondary winding of transformer is connected with the input of described output rectifier and filter; The output of described output rectifier and filter is connected with the input of described voltage regulator circuit, and is connected with the input of described current detection circuit; Described voltage regulator circuit is connected with described pwm control circuit.
The utility model also proposes a kind of switching circuit, and this switching circuit comprises voltage commutation circuit, and this voltage commutation circuit comprises current detection circuit, current comparison circuit, hysteresis comparison circuit, voltage control circuit and voltage regulator circuit; Wherein:
Described current detection circuit is connected with described hysteresis comparison circuit by described current comparison circuit, described hysteresis comparison circuit is connected with described voltage regulator circuit by described voltage control circuit, the size of the electric current that two outputs of the more described current detection circuit of this current comparison circuit are exported, to the described hysteresis comparison circuit output feedback voltage corresponding with this electric current comparative result, this hysteresis comparison circuit sends the level signal corresponding with this feedback voltage to described voltage control circuit, and this voltage control circuit is controlled the described voltage commutation circuit output voltage corresponding with this level signal by described voltage regulator circuit.
The voltage commutation circuit that the utility model proposes is by detecting the output current under the different working modes, control output HIGH voltage or low-voltage, reach by single channel output and realize that height two-way voltage switches the purpose of output, and then reduced stand-by power consumption, and simplified implementation procedure, reduce cost.
Description of drawings
Fig. 1 is the theory diagram of the utility model voltage commutation circuit preferred embodiment;
Fig. 2 is the electrical block diagram of the utility model voltage commutation circuit preferred embodiment.
The realization of the purpose of this utility model, functional characteristics and advantage will be in conjunction with the embodiments, and be described further with reference to accompanying drawing.
Embodiment
Further specify the technical solution of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
The utility model proposes a kind of voltage commutation circuit.With reference to Fig. 1, Fig. 1 is the theory diagram of the utility model voltage commutation circuit preferred embodiment.
Among the utility model embodiment, voltage commutation circuit comprises current detection circuit 10, current comparison circuit 11, hysteresis comparison circuit 12, voltage control circuit 13 and voltage regulator circuit 14.
Wherein, current detection circuit 10 is connected with hysteresis comparison circuit 12 by current comparison circuit 11, hysteresis comparison circuit 12 is connected with voltage regulator circuit 14 by voltage control circuit 13, the size of the electric current that two outputs that this current comparison circuit 11 compares current detection circuit 10 are exported, to the hysteresis comparison circuit 12 outputs feedback voltage corresponding with this electric current comparative result, this hysteresis comparison circuit 12 sends the level signal corresponding with this feedback voltage to voltage control circuit 13, and this voltage control circuit 13 is by the voltage regulator circuit 14 control voltage commutation circuit outputs voltage corresponding with this level signal.
Particularly, voltage commutation circuit also comprises input rectifying filter circuit 16, pwm control circuit 17, transformer 18 and output rectifier and filter 19; Wherein, the input of input rectifying filter circuit 16 is connected with power input VIN, and output is connected with the input of pwm control circuit 17; The output of pwm control circuit 17 is connected with the elementary winding of transformer 18, and the auxiliary winding of transformer 18 connects pwm control circuit 17, and the secondary winding of transformer 18 is connected with the input of output rectifier and filter 19; The output of output rectifier and filter 19 is connected with the input of voltage regulator circuit 14, and is connected with the input of current detection circuit 10; Voltage regulator circuit 14 is connected with pwm control circuit 17.More specifically, pwm control circuit 17 comprises (all not shown among the figure) such as drive IC, optocoupler control modules, and output rectifier and filter 19 comprises diode (all not shown among the figure).
In the present embodiment, behind the rectifying and wave-filtering of input rectifying filter circuit 16, become direct current from the alternating current of power input VIN input, provide voltage to power to drive IC, drive IC starts the metal-oxide-semiconductor of back output square-wave pulse conducting inside, input direct voltage is added on the transformer 18, transformer 18 can be used as its electric current straight line of an inductance and rose this moment, swashed end principle of the same name according to anti-, the diode that the voltage of transformer 18 outputs this moment can not conducting output rectifier and filter 19; When drive IC output ends, because inductive current can not suddenly change, according to end principle of the same name, but the diode of the voltage conducting output rectifier and filter 19 of transformer 18 outputs this moment, equal the ratio relation of umber of turn according to the ratio of voltage, the winding of an end that is connected with pwm control circuit of transformer 18 is also with output voltage, this voltage will be powered for drive IC, the optocoupler control module detects height and the timely metal-oxide-semiconductor ON time of adjusting drive IC inside of output voltage in real time simultaneously, thereby regulated output voltage, produce induced voltage output dc voltage behind the rectifying and wave-filtering of output rectifier and filter 19 on the secondary winding of transformer 18, current detection circuit 10 detects the electric current of this output voltage, and between two outputs, produce voltage drop, this voltage drop is exported feedback voltage to hysteresis comparison circuit 12 after current comparison circuit 11 relatively amplifies, the relatively back outputs level signals of reference voltage in this feedback voltage and the hysteresis comparison circuit 12 is to voltage control circuit 13, this voltage control circuit 13 is according to the state control voltage regulator circuit 14 of level signal, voltage regulator circuit 14 produces the control electric current according to electric current and the internal reference voltage ratio of the difference generation of divider resistance, the big young pathbreaker of this electric current controls the metal-oxide-semiconductor ON time of drive IC inside, thereby the output that realizes different voltages is switched.
In conjunction with Fig. 1 and Fig. 2, wherein Fig. 2 is the electrical block diagram of the utility model voltage commutation circuit preferred embodiment.
In the present embodiment, voltage commutation circuit also comprises start protecting against shock circuit 15, and an end of this start protecting against shock circuit 15 is connected with current comparison circuit 11, and the other end of start protecting against shock circuit 15 is connected with hysteresis comparison circuit 12.Start protecting against shock circuit 15 was avoided in system boot moment, the current over pulse that the load electrochemical capacitor of voltage commutation circuit output causes and cause the problem of hysteresis comparison circuit 12 misoperations.
Particularly, start protecting against shock circuit 15 comprises diode D1, first resistance R 1 and first capacitor C 1; One end of first capacitor C 1 is connected with the output of output rectifier and filter 19, and the other end of first capacitor C 1 is divided into two-way, and one the tunnel through first resistance R, 1 ground connection, and another road is connected with hysteresis comparison circuit 12 through diode D1.
Particularly, current detection circuit 10 comprises second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5; Second resistance R 2 and 3 parallel connections of the 3rd resistance R, one common port of second resistance R 2 and 3 parallel connections of the 3rd resistance R is connected with an end of the 4th resistance R 4, another common port of second resistance R 2 and 3 parallel connections of the 3rd resistance R is connected with an end of the 5th resistance R 5, and the other end of the 4th resistance R 4 is done and the other end of the 5th resistance R 5 is connected to current comparison circuit 11 respectively.
In the present embodiment, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5 are precision resistance, guarantee output current is detected accurately.
Particularly, current comparison circuit 11 comprises the first comparator U1, the 6th resistance R 6 and second capacitor C 2.
Wherein, the in-phase input end of the first comparator U1 and inverting input all are connected with current detection circuit 10, namely the in-phase input end of the first comparator U1 is connected with the 4th resistance R 4, the inverting input of the first comparator U1 is connected with the 5th resistance R 5, as shown in Figure 2, in current detection circuit 10 and the current comparison circuit 11, network label A+ represents that the in-phase input end of the first comparator U1 is connected with the 4th resistance R 4, network label A-represents that the inverting input of the first comparator U1 is connected with the 5th resistance R 5, the output of the first comparator U1 is connected with hysteresis comparison circuit 12, the earth terminal ground connection of the first comparator U1; The 6th resistance R 6 is connected between the output of the inverting input of the first comparator U1 and the first comparator U1, and second capacitor C 2 is in parallel with the 6th resistance R 6.In the present embodiment, the 6th resistance R 6 and second capacitor C 2 constitute the negative feedback loop of the first comparator U1.
Particularly, hysteresis comparison circuit 12 comprises the second comparator U2, the first pressurizer U3, the 7th resistance R 7, the 8th resistance R 8 and the 9th resistance R 9.
Wherein, the in-phase input end of the second comparator U2 is connected to current comparison circuit 11, namely the in-phase input end of the second comparator U2 is connected with the output of the first comparator U1, the inverting input of the second comparator U2 is connected with the negative electrode of diode D1, as shown in Figure 2, in hysteresis comparison circuit 12 and the start protecting against shock circuit 15, network label B represents that the inverting input of the second comparator U2 is connected with the negative electrode of diode D1, and the inverting input of the second comparator U2 is connected with the control utmost point of the first pressurizer U3 and the negative electrode of the first pressurizer U3 respectively through the 7th resistance R 7, the output of the second comparator U2 is connected with output voltage controlling circuit 13, the power end of the second comparator U2 is connected with the output of output rectifier and filter 19, and the power end of the second comparator U2 is connected with the negative electrode of the first pressurizer U3 through the 8th resistance R 8, the equal ground connection of the anode of the earth terminal of the second comparator U2 and the first pressurizer U3, the 9th resistance R 9 is connected between the in-phase input end and output of the second comparator U2.
In the present embodiment, network label Vo in current comparison circuit 11, hysteresis comparison circuit 12 and the output rectifier and filter 19, the expression output voltage, the voltage of also representing voltage commutation circuit output provides operating voltage for the first comparator U1 in the current comparison circuit 11 and the second comparator U2 in the hysteresis comparison circuit 12.
Particularly, voltage control circuit 13 comprises triode Q1 and the tenth resistance R 10; The base stage of triode Q1 is connected to hysteresis comparison circuit 12, and namely the base stage of triode Q1 is connected with the output of the second comparator U2, the grounded emitter of triode Q1, and the base collector of triode Q1 is connected with voltage regulator circuit 14 through the tenth resistance R 10.In the present embodiment, triode Q1 is the NPN triode.
Particularly, voltage regulator circuit 14 comprises the second pressurizer U4, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 3rd capacitor C 3 and the 4th capacitor C 4.
Wherein, it is in parallel with the 4th capacitor C 4 after the 3rd capacitor C 3 is connected with the 13 resistance R 13, one end of the 4th capacitor C 4 is connected with the negative electrode of the second pressurizer U4, and the other end of the 4th capacitor C 4 is connected the plus earth of the second pressurizer U4 with the control utmost point of the second pressurizer U4; One end of the 12 resistance R 12 is connected with the output of voltage commutation circuit, and the other end of the 12 resistance R 12 is divided into three the tunnel, the one tunnel and is connected with the control utmost point of the second pressurizer U4, and one the tunnel is connected with voltage control circuit 13, leads up to the 11 resistance R 11 ground connection.In the present embodiment, the 11 resistance R 11 and the 12 resistance R 12 are the sample resistance of output voltage, and output voltage is taken a sample.
In the utility model voltage commutation circuit, the winding turns of transformer 18 inside is than according to maximum output voltage relation design, below respectively to system standby, operate as normal and again the operation principle under three kinds of different modes of standby specifically describe:
The alternating current of power supply input becomes direct current behind the rectifying and wave-filtering of input rectifying filter circuit 16, be input to the elementary winding of transformer 18, secondary winding at transformer 18 produces induced voltage, this induced voltage is exported the output voltage of direct current behind the rectifying and wave-filtering of output rectifier and filter 19, current detection circuit 10 detects this electric current corresponding with output voltage, output current is second resistance R 2 in overcurrent sensing circuit 10 and the 3rd resistance R 3 respectively, the 4th resistance R 4 and the 5th resistance R 5 detect the electric current at second resistance R 2 and two ends, the 3rd resistance R 3 shunt circuit respectively, produce voltage drop in second resistance R 2 and two ends, the 3rd resistance R 3 shunt circuit, namely the voltage that produces of the voltage that produces in the 4th resistance R 4 and the 5th resistance R 5 is variant, the voltage that produces in the 4th resistance R 4 exports the in-phase input end of the first comparator U1 to, and the voltage that produces in the 5th resistance R 5 exports the inverting input of the first comparator U1 to.
Present embodiment is set output current less than 0.5A the time, the first comparator U1 is because in-phase voltage is lower than reverse voltage, output low level, the voltage of output is less than 2.5V, be added in the inverting input of the second comparator U2 in the hysteresis comparison circuit 12 by the inner 2.5V reference voltage that produces of the first pressurizer U3, as the reference voltage of the second comparator U2.
System is when standby, output current is less than 0.5A, the voltage of first comparator U1 output is less than 2.5V, be added in the in-phase input end of the second comparator U2, make the voltage of in-phase input end of the second comparator U2 less than the voltage of its inverting input, the second comparator U2 output low level signal, voltage control circuit 13 is not worked, because the dividing potential drop effect of the 11 resistance R 11 and the 12 resistance R 12, output voltage is taken a sample, this moment, the 11 resistance R 11 and the 5V voltage sampling of the 12 resistance R 12 for setting concerned Vo=(R at this moment according to electric resistance partial pressure
12/ R
11+ 1) in the * 2.5(formula, R
11The resistance of representing the 11 resistance R 11, R
12The resistance of representing the 12 resistance R 12, Vo represents output voltage), output voltage is 5V.
System is when operate as normal, output current increases, be increased to greater than the value 0.5A that sets, the voltage that output current produces in the 4th resistance R 4 is greater than the voltage that produces in the 5th resistance R 5, namely the voltage of the in-phase input end of the first comparator U1 is greater than the voltage of the inverting input of the first comparator U1, first comparator U1 output this moment high level signal, and the increase along with output current, the voltage of first comparator U1 output is more high, the voltage of first comparator U1 output is greater than 2.5V, this voltage is added in the in-phase input end of the second comparator U2, with the reference voltage 2.5V of the inverting input of the second comparator U2 relatively, because the in-phase input end voltage of the second comparator U2 is greater than inverting input voltage, therefore the voltage of second comparator U2 output is high level, this voltage is added in the base stage of triode Q1, triode Q1 saturation conduction, voltage control circuit 13 operate as normal, make the tenth resistance R 10 ground connection, thereby the tenth resistance R 10 and the 11 resistance R 11 ground connection in parallel, in the present embodiment, because the tenth resistance R 10 and the 11 resistance R 11 all-in resistances in parallel diminish, concern Vo=[R according to output voltage this moment
12/ (R
11/ R
10)+1] in the * 2.5(formula, R
10The resistance of representing the tenth resistance R 10, R
11The resistance of representing the 11 resistance R 11, R
12The resistance of representing the 12 resistance R 12, Vo represents output voltage), output voltage switches to 24V.
When system again during standby, output current becomes less than 0.5A, the voltage of first comparator U1 output is less than 2.5V, be added in the in-phase input end of the second comparator U2, with the reference voltage 2.5V of the inverting input of the second comparator U2 relatively, the second comparator U2 output low level signal, the base voltage of triode Q1 is not enough and end, voltage control circuit 13 is not worked, enter the 5V voltage sampling of setting after the 11 resistance R 11 and the 12 resistance R 12 dividing potential drops again, make output voltage switch to 5V.
Voltage commutation circuit of the present utility model, by detecting the output current under the different working modes, control output HIGH voltage or low-voltage, reach by single channel output and realize that height two-way voltage switches the purpose of output, the automatic recognition function of realization system, the output voltage automatic switching function, and then reduced stand-by power consumption, simplified implementation procedure, reduced cost.
The utility model also provides a kind of switching circuit, this switching circuit comprises voltage commutation circuit, among this embodiment, described voltage commutation circuit can be used for providing power supply for switching circuit, the technique effect that brings of the circuit structure of this voltage commutation circuit, operation principle and this voltage commutation circuit is consistent with above-described embodiment also, all repeats no more herein.
The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (10)
1. a voltage commutation circuit is characterized in that, comprises current detection circuit, current comparison circuit, hysteresis comparison circuit, voltage control circuit and voltage regulator circuit; Wherein:
Described current detection circuit is connected with described hysteresis comparison circuit by described current comparison circuit, described hysteresis comparison circuit is connected with described voltage regulator circuit by described voltage control circuit, the size of the electric current that two outputs of the more described current detection circuit of this current comparison circuit are exported, to the described hysteresis comparison circuit output feedback voltage corresponding with this electric current comparative result, this hysteresis comparison circuit sends the level signal corresponding with this feedback voltage to described voltage control circuit, and this voltage control circuit is controlled the described voltage commutation circuit output voltage corresponding with this level signal by described voltage regulator circuit.
2. voltage commutation circuit as claimed in claim 1 is characterized in that, also comprises start protecting against shock circuit, and an end of this start protecting against shock circuit is connected with described current comparison circuit, and the other end is connected with described hysteresis comparison circuit.
3. voltage commutation circuit as claimed in claim 2 is characterized in that, described start protecting against shock circuit comprises diode, first resistance and first electric capacity; One end of described first electric capacity is connected with described current comparison circuit, and the other end is divided into two-way, and one the tunnel through described first grounding through resistance, and another road is connected with described hysteresis comparison circuit through described diode.
4. voltage commutation circuit as claimed in claim 1 is characterized in that, described current detection circuit comprises second resistance, the 3rd resistance, the 4th resistance and the 5th resistance; Described second resistance and described the 3rd resistance parallel connection, the one common port is connected with an end of described the 4th resistance, another common port is connected with an end of described the 5th resistance, and the other end of described the 4th resistance is done and the other end of described the 5th resistance is connected to described current comparison circuit respectively.
5. voltage commutation circuit as claimed in claim 1 is characterized in that, described current comparison circuit comprises first comparator, the 6th resistance and second electric capacity; Wherein:
The in-phase input end of described first comparator and inverting input all are connected with described current detection circuit, and its output is connected with described hysteresis comparison circuit, the earth terminal ground connection of described first comparator; Described the 6th resistance is connected between the inverting input and output of described first comparator, and described second electric capacity is in parallel with described the 6th resistance.
6. voltage commutation circuit as claimed in claim 1 is characterized in that, described hysteresis comparison circuit comprises second comparator, first pressurizer, the 7th resistance, the 8th resistance and the 9th resistance; Wherein:
The in-phase input end of described second comparator is connected with described current comparison circuit, the inverting input of described second comparator is connected with negative electrode with the control utmost point of described first pressurizer respectively through described the 7th resistance, the output of described second comparator is connected with described voltage control circuit, and its power end is connected with the negative electrode of described first pressurizer through described the 8th resistance, the equal ground connection of the anode of the earth terminal of described second comparator and described first pressurizer, described the 9th resistance is connected between the in-phase input end and output of described second comparator.
7. voltage commutation circuit as claimed in claim 1 is characterized in that, described voltage control circuit comprises triode and the tenth resistance; The base stage of described triode is connected with described hysteresis comparison circuit, the grounded emitter of described triode, and the collector electrode of described triode is connected with described voltage regulator circuit through described the tenth resistance.
8. voltage commutation circuit as claimed in claim 1 is characterized in that, described voltage regulator circuit comprises second pressurizer, the 11 resistance, the 12 resistance, the 13 resistance, the 3rd electric capacity and the 4th electric capacity; Wherein, it is in parallel with described the 4th electric capacity after described the 3rd electric capacity is connected with described the 13 resistance, one end of described the 4th electric capacity is connected with the negative electrode of described second pressurizer, and the other end is connected the plus earth of described second pressurizer with the control utmost point of described second pressurizer; One end of described the 12 resistance is connected with the output of described voltage commutation circuit, and the other end is divided into three the tunnel, the one tunnel and is connected with the control utmost point of described second pressurizer, and one the tunnel is connected with described voltage control circuit, leads up to described the 11 grounding through resistance.
9. voltage commutation circuit as claimed in claim 1 is characterized in that, described voltage commutation circuit also comprises input rectifying filter circuit, pwm control circuit, transformer and output rectifier and filter; Wherein, the input of described input rectifying filter circuit is connected with power input, and output is connected with the input of described pwm control circuit; The output of described pwm control circuit is connected with the elementary winding of described transformer, and the auxiliary winding of described transformer connects described pwm control circuit, and described Secondary winding of transformer is connected with the input of described output rectifier and filter; The output of described output rectifier and filter is connected with the input of described voltage regulator circuit, and is connected with the input of described current detection circuit; Described voltage regulator circuit is connected with described pwm control circuit.
10. a switching circuit is characterized in that, comprises each described voltage commutation circuit in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207399485U CN203135728U (en) | 2012-12-28 | 2012-12-28 | Voltage switching circuit and switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207399485U CN203135728U (en) | 2012-12-28 | 2012-12-28 | Voltage switching circuit and switch circuit |
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| CN203135728U true CN203135728U (en) | 2013-08-14 |
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| CN2012207399485U Expired - Fee Related CN203135728U (en) | 2012-12-28 | 2012-12-28 | Voltage switching circuit and switch circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106059310A (en) * | 2016-06-29 | 2016-10-26 | 中国北方车辆研究所 | Power reduction output circuit of power supply transformation device for high-voltage supercapacitor |
| CN106816926A (en) * | 2017-01-24 | 2017-06-09 | 广州市极越电子有限公司 | A kind of battery charging and discharging management system and method based on computation chip |
| CN107710552A (en) * | 2016-02-05 | 2018-02-16 | 广东欧珀移动通信有限公司 | Adapter and charge control method |
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2012
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107710552A (en) * | 2016-02-05 | 2018-02-16 | 广东欧珀移动通信有限公司 | Adapter and charge control method |
| CN107710552B (en) * | 2016-02-05 | 2021-05-18 | Oppo广东移动通信有限公司 | Adapter and charging control method |
| CN106059310A (en) * | 2016-06-29 | 2016-10-26 | 中国北方车辆研究所 | Power reduction output circuit of power supply transformation device for high-voltage supercapacitor |
| CN106059310B (en) * | 2016-06-29 | 2020-10-20 | 中国北方车辆研究所 | Power reduction output circuit of power conversion device for high-voltage super capacitor |
| CN106816926A (en) * | 2017-01-24 | 2017-06-09 | 广州市极越电子有限公司 | A kind of battery charging and discharging management system and method based on computation chip |
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