CN2809694Y - Enable circuit for eliminating negative voltage transient and battery charging unit therefor - Google Patents
Enable circuit for eliminating negative voltage transient and battery charging unit therefor Download PDFInfo
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- CN2809694Y CN2809694Y CNU2005200008635U CN200520000863U CN2809694Y CN 2809694 Y CN2809694 Y CN 2809694Y CN U2005200008635 U CNU2005200008635 U CN U2005200008635U CN 200520000863 U CN200520000863 U CN 200520000863U CN 2809694 Y CN2809694 Y CN 2809694Y
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Abstract
The utility model provides an enabling circuit capable of eliminating transient of the negative voltage and a battery charger. The enabling circuit comprises a comparison circuit, a switch circuit and an output judgment circuit, wherein the comparison circuit compares and a first comparison signal which represents the charge of a capacitor of a direct current/direct current converter, and a second comparison signal which represents the referential charge, and then respond to the comparison so as to provide a comparison output signal. When the charge of the capacitor is smaller than the referential charge, the switch circuit responds to the comparison output signal and provides a first switching signal in the first state. Finally, the output judgment circuit receives at least the first switching signal and responds to the first switching signal in the first state, so that the direct current/direct current converter can be controlled by a control signal.
Description
Technical field
The utility model relate to a kind of elimination one associated adjustment circuit the negative voltage transition enable (enabling circuit) circuit, if the enable circuits when particularly relating to electric charge on the synchronous rectifier converter energy-storage travelling wave tube less than a reference charge, it is one second state from one first state exchange that this circuit can make a synchronous rectifier converter.
Background technology
A lot of circuit contain energy-storage travelling wave tube, as electric capacity, inductance, and transformer, these elements are sent to energy the output of this type of circuit from input.If these energy-storage travelling wave tubes are not correctly discharged in some cases, the power disturbance of not expecting, for example negative voltage transition will occur in the output signal, cause the infringement near sensitive element.
For example, this regulating circuit can be a DC-DC converter (DC-DCconverter).DC-DC converter receives the direct current input of certain magnitude of voltage usually, and converts thereof into the direct current output of a higher or lower magnitude of voltage.This DC-DC converter can be widely used in the many electronic installations that link to each other with multiple systems.Wherein a kind of system can be used to be portable electric appts, as kneetop computer, mobile phone, pager, personal digital assistant or the like, provides a battery charging function.
Wherein a kind of DC-DC converter is a synchronous rectifier converter (SRC).SRC does not use any schottky diode (Schottky diodes), and is to use the transistor that is called " synchronous rectifier ".This transistorlike can be multiple transistor, for example MOS or mosfet transistor.SRC also can have multiple built-in element, typical built-in element comprises an energy-storage travelling wave tube, for example an electric capacity, inductance, or transformer, with one or more transistors, be controlled by the various control technology, for example width modulation (pulse width modulation, PWM), wherein switching frequency is that constant and work period are along with load variations.
When a SRC was applied in the power of battery management system, this SRC can receive an input voltage from many different electrical power, and converted thereof into a suitable output voltage, was used to provide a suitable relevant rechargeable battery of charging current to.In this type of power of battery management system, there is a correlation control unit to be used for controlling battery charging process usually.This quasi-controller can be one to contain the integrated circuit (IC) of a plurality of input ends or pin, the output that some input ends wherein or pin are connected to SRC.For example, two such ports can be coupled to an either side that detects resistance.This detects resistance and can connect with the output of this SRC, and the signal of this SRC output terminal charging current of expression so just can be provided.
If a soft start occurs in the energy-storage travelling wave tube of this SRC, an electric capacity for example is at an effective value (significant value) when being recharged, for example above several volts, the negative voltage transition can appear at the arbitrary end that detects resistance, causes the correlation control unit integrated circuit that fatefulue fault takes place.Therefore, need an enable circuits and method to overcome above-mentioned the deficiencies in the prior art, and start an associated adjustment circuit when being lower than a reference charge, eliminate negative voltage transition from this regulating circuit by the electric charge on and if only if the energy-storage travelling wave tube.
The utility model content
The purpose of this utility model is to address the above problem.
The utility model provides an enable circuits, makes a DC-DC converter controlled by a control signal, and this converter contains an electric capacity that is coupled to its output terminal.This enable circuits can comprise a comparator circuit, is used for first comparison signal of comparison one expression capacitance charge and second comparison signal of an expression reference charge, and responds this comparison output signal relatively is provided.This enable circuits also can comprise an on-off circuit, is used for receiving this comparison output signal, and if capacitance charge less than reference charge, then respond this comparison output signal at least and provide one first switching signal at one first state; With an output decision circuitry, be used for receiving this first switching signal at least, and this first switching signal that responds under this first state provides an enable signal, be used for making this DC-DC converter controlled by this control signal.
Enable circuits described in the utility model, described output decision circuitry also receives a status signal, if and described first switching signal is in described first state, described status signal is in the state that charged state is expected in an expression one, described output decision circuitry then provides described enable signal.
Enable circuits described in the utility model, described output decision circuitry comprise one with door, describedly receive described first switching signal and a described status signal with door.
Enable circuits described in the utility model, if described capacitance charge is greater than described reference charge, described on-off circuit then also provides one second switching signal at one first state, if described capacitance charge is less than described reference charge, described on-off circuit then also provides one second switching signal at one second state, and described enable circuits also comprises a discharge path, if described second switching signal is in described first state, described path then responds described second switching signal to described capacitor discharge.
Enable circuits described in the utility model, described discharge path comprises a switch, if described second switching signal is in described first state, described switch then responds described second switching signal and closure, if described second switching signal is in described second state, described switch then disconnects.
Enable circuits described in the utility model, described on-off circuit comprises a rest-set flip-flop.
The utility model also provides a battery charger, and this system comprises a DC-DC converter, is used for receiving a power input value from a direct current power supply, and stable output power value to a rechargeable battery is provided.This DC-DC converter can have an electric capacity, and this is capacitively coupled to the output terminal of this DC-DC converter.This battery charger also can comprise an enable circuits, makes this DC-DC converter controlled by a control signal.This enable circuits can comprise a comparator circuit, is used for first comparison signal of comparison one expression capacitance charge and second comparison signal of an expression reference charge, and responds this comparison output signal relatively is provided.This enable circuits also can comprise an on-off circuit, is used for receiving this comparison output signal, and if capacitance charge less than reference charge, then respond this comparison signal at least and provide one first switching signal at first state; With an output decision circuitry, be used for receiving this first switching signal at least, and the response that responds this first switching signal under this first state provides an enable signal, make this DC-DC converter controlled by this control signal.
Battery charger described in the utility model, described output decision circuitry also receives a status signal, if and described first switching signal is in the state that described first state, described status signal are in an expression one ideal charging state, described output decision circuitry then provides described enable signal.
Battery charger described in the utility model, described output decision circuitry comprise one with door, describedly receive described first switching signal and a described status signal with door.
Battery charger described in the utility model, if described capacitance charge is greater than described reference charge, described on-off circuit then also provides one second switching signal at one first state, if described capacitance charge is less than described reference charge, described on-off circuit then provides one second switching signal at one second state, and described enable circuits also comprises a discharge path, if described second switching signal is in described first state, described path then responds described second switching signal to described capacitor discharge.
Battery charger described in the utility model, described discharge path comprises a switch, if described second switching signal is in described first state, described switch then responds described second switching signal and closure, if described second switching signal is in described second state, described switch then disconnects.
Battery charger described in the utility model, described on-off circuit comprises a rest-set flip-flop.
Battery charger described in the utility model, described control signal comprises a pulse-width signal.
The enable circuits that the utility model provides, when capacitance charge is higher than reference charge, make the control of the uncontrolled signal of DC-DC converter, be discharged to up to electric capacity and be lower than reference charge, thereby can eliminate the negative voltage transition that may appear at the DC-DC converter output terminal.
Description of drawings
Fig. 1 is of the present utility model one calcspar that comprises the system of enable circuits, and it is one second state from one first state exchange that this enable circuits makes an associated adjustment circuit;
Fig. 2 is the calcspar of a typical enable circuits of the present utility model, and it is another state from a state exchange that this enable circuits makes a related synchronous rectifier converter;
Fig. 2 A is the circuit diagram of an exemplary embodiments of enable circuits among Fig. 2;
Fig. 3 is the calcspar of a battery management system, and this system has adopted the enable circuits among Fig. 2; With
Fig. 4 is the calcspar of another embodiment of a typical enable circuits in the battery charger.
Embodiment
Figure 1 shows that a canonical system 100, this system comprises an enable circuits 104 and an associated adjustment circuit 102.Regulating circuit 102 can be the circuit of any type, and for example a synchronous rectifier converter comprises an energy-storage travelling wave tube 106, for example an electric capacity.Usually, the electric charge on the enable circuits 104 monitoring energy-storage travelling wave tubes 106, and when the electric charge on the energy-storage travelling wave tube was lower than a reference charge, making regulating circuit 102 was one second state from one first state exchange.This first state can be the state of any type, for example one closes electricity condition, and this second state also can be the state of any type, a duty for example, and wherein regulating circuit 102 is controlled by a special control technology.This reference charge should be selected according to the sensitivity of this special system and related elements.In one embodiment, this reference charge can be 3.0 volts.
In one embodiment, in case the electric charge on the energy-storage travelling wave tube 106 is lower than this reference charge, 104 of enable circuits send an enable signal and pass through path 115 to controller 120.Controller 120 these enable signals of response then make regulating circuit 102 from one first state, and for example an off working state or a predetermined suitable duty are converted to one second state, for example another duty.Like this, enable circuits 104 of the present utility model can be advantageously in the work of the second state delay regulating circuit 102, keep the work of regulating circuit 102 simultaneously at first state, be discharged to up to energy-storage travelling wave tube 106 and be lower than reference charge.
In another embodiment, be discharged to up to energy-storage travelling wave tube 106 and be lower than the logic control signal that reference charge value and inputs to enable circuits 104, signal chginh for example, when being in a predetermined state, enable circuits 104 just can send an enable signal to controller 120.This type of predetermined state is represented the non-energy-storage travelling wave tube condition of at least a ideal.This type of predetermined state also can be represented the non-energy-storage travelling wave tube condition of every other ideal.In this example, enable circuits 104 of the present utility model is work at this second state delay conversion regulating circuit 102, the work that keeps regulating circuit 102 simultaneously at this first state, for example an off working state or is scheduled to suitable duty, is discharged to less than reference charge value and at least one non-energy-storage travelling wave tube condition about regulating circuit 102 work of a signal indication up to energy-storage travelling wave tube 106 to be satisfied.
Figure 2 shows that a canonical system 200, this system contains an enable circuits 204 of the present utility model and a synchronous rectifier converter (SRC) 202.This SRC receives an input voltage signal at input end 226, and provides an output voltage signal at output terminal 211.This SRC can comprise an inductance 208, one electric capacity 206 and K switch 1, K2.K switch 1, K2 can be the transistor of any type, in order to represent with MOS transistor among the easy figure.This type of K switch 1, K2 are controlled by the various control technology can, for example width modulation (PWM), wherein switching frequency be constant and work period along with load variations, pulse frequency modulation, or these control technologys that are well known to those skilled in the art such as current limliting pulse frequency modulation.
Fig. 2 A is depicted as the circuit diagram of a typical enable circuits 204a.Those skilled in the art understand many circuit structures and can be used in the enable circuits of the present utility model.In the exemplary embodiments of Fig. 2 A, the comparator circuit 232 of Fig. 2 comprises a comparer 232a, and its positive input terminal receives the input signal of expression electric capacity 206 electric charges, and negative input end receives another input control signal Vdsch, this signal indication one reference charge value.
The work of the typical enable circuits 204a of system 200 is described further the truth table of reference table 1 at this.Table 1 has described the state of each control signal and inter-related switch in detail, wherein exports decision circuitry 234 and works as the rejection gate 234a among Fig. 2 A.Input to the control signal chginh of enable circuits 204, control signal dsch from comparer 232a output, from the control signal chgen of rejection gate 234a output, the K switch 1 of SRC202, K2, and the K switch 3 of enable circuits 204, the state of K4 are all listed in table 1 in detail.
Table 1
| chginh dsch chgen | H H L | H L L | L H L | L L H |
| K1 K2 K3 K4 | OFF OFF ON ON | OFF OFF ON ON | OFF OFF ON ON | PWM PWM OFF OFF |
As what fully describe at this, advantageously typical enable circuits 204a makes K switch 1, the K2 of SRC202 not controlled by suitable control technology, for example PWM control, and make K switch 1, K2 remain on off-state (OFF position), be discharged to up to the electric capacity 206 of SRC202 and be lower than reference charge (control signal dsch is L), and have at least the noncapacitive charging correlated condition of another regulating circuit work to be satisfied.So just can eliminate the negative voltage transition that may appear at SRC202 output terminal 211.
Shown in table 1 first row, if the charge value of electric capacity 206 greater than the reference charge value, as it is represented to input to the control signal Vdsch of comparer 232a, the control signal dsch from this comparer 232a output be a height so.The output control signal dsch of comparer 232a then is input to rejection gate 234a.
Another of rejection gate 234a is input as the control signal chginh from independent source.This control signal chginh represents at least one and the relevant noncapacitive correlated condition of SRC202 work.In this embodiment, if this signal chginh is low, at least one and the every other noncapacitive correlated condition relevant with SRC202 of possibility are satisfied.If this signal chginh is high, this type of condition is not satisfied.Therefore, also be height if the output control signal dsch of comparer 232a is height and signal chginh, the output signal of rejection gate 234a is low so.Thereby K switch 1 and K2 keep disconnecting, and the work of SRC202 is delayed.So,, in this example, will not provide this charging current so, and come the flow through electric current of inductance 208 of self-capacitance 206 also can not exist if SRC202 attempt provides a charging current to a rechargeable battery of being correlated with.
The secondary series of reference table 1 is lower than the represented reference charge by control signal Vdsch if electric capacity 206 is discharged to, and the output control signal dsch of comparer 232a becomes low, and the charge value of expression electric capacity 206 is acceptable.Yet if another noncapacitive charging correlated condition is not satisfied, it is high that control signal chginh keeps.Like this, the output of rejection gate 234a keeps low and work SRC202 still is delayed.
The 3rd row of reference table 1 if control signal chginh is low, represent a desirable starting state of at least one non-charging correlated condition, and the output control signal dsch of comparer 232a are high, and the output signal chgen of rejection gate 234a keeps low so.Like this, the work of SRC202 still is delayed.
Shown in table 1 the 4th row, be discharged to up to electric capacity and be lower than reference charge value (comparer 232a output control signal dsch be low), and if not the non-charging correlated condition of every other regulating circuit work and at least one (control signal chginh is low) be satisfied, the control signal chgen of rejection gate 234a output just be a height.In case control signal chgen is high, the K switch 3 of enable circuits 204a and K4 disconnect.Control signal chgen is high, makes controller 220 drive SRC202.Therefore, K switch 1, K2 are controlled by a suitable control technology, for example PWM.
If there is not enable signal in this embodiment, K switch 3, K4 closure.Then K switch 3, K4 have constituted the discharge path of electric capacity 206.K switch 3 is also connected with resistance R 1, and K switch 4 is also connected with resistance R 2 simultaneously.The resistance value of resistance R 1 is higher than the resistance value of resistance R 2.Like this, because the enable signal of rejection gate 234a do not exist, so at this moment K switch 3, K4 closure constitutes a discharge path and resistance R 2 and begin electric capacity 206 discharges.
Figure 3 shows that a representative cells charging device 300, this system generally includes a power supply 344, one SRC302, an enable circuits 304, one rechargeable batteries 340 of the present utility model, and a battery charge controller 320.Battery charger 300 can be used in the multiple portable electric appts, for example kneetop computer, mobile phone, pager, personal digital assistant or the like, flow to a rechargeable battery 340, for example lithium battery, nickel-cadmium battery or Ni-MH battery to provide and to control electric weight.
Can adopt a sensor, for example detect resistance 346, provide a detection signal to controller 320, expression flow to the charging current Ichg of battery.Controller 320 is generally an integrated circuit (IC) and to negative voltage transition sensitivity, is not lower than the reference charge value if energy-storage travelling wave tube 306 suitably is discharged to, and this transition can appear at port 349, port 351.This type of negative voltage transition appears at port 349 or port 351 is because the inductance of SRC302 and the vibration that the electric capacity group causes.
In case power supply 344 suitably is coupled to system 300, it then provides an input direct voltage signal to SRC302.Power supply 344 can be an AC/DC adapter, be used for receiving the standard electric alternating current pressure of supply socket and being converted into an available DC voltage, an or DC/DC adapter, the adapter of one " lighter " type for example, be used for inserting the socket an of the type, or in the power supply of other types.
Advantageously, SRC302 receives the power input from power supply 344, and be converted into a suitable output voltage and a current value, and only receive one during by path 315 when controller 320 from the enable signal of enable circuits 304, provide a charging current Ichg to battery 340.In addition, controller 320 postpones to provide charging current Ichg to battery 340, keeps SRC302 to be in a predetermined appropriate state simultaneously.Should predetermined appropriate state can be state by any type that state determined of the multiple switch of SRC302.In the last embodiment of Fig. 2, the K switch 1 of SRC202, the selected off-state that is in of K2.The controlled device 320 of SRC302 is controlled with the control technology of any type, PWM for example, and these technology are well known to those skilled in the art.
Therefore more advantageously, enable circuits 304 postpones the charging current Ichg that flow to battery 340 is provided, and is discharged to up to energy-storage travelling wave tube 306 to be lower than reference charge.Enable circuits 304 also can postpone to flow to the charging current Ichg of battery 340, and up to another control signal from another source, for example signal chginh represents that at least one non-charging correlated condition relevant with SRC302 work is satisfied.
In another embodiment, Figure 4 shows that a battery charger 400, this system generally includes a direct current power supply 444, is used for providing electric weight for rechargeable battery 440.Battery charging state is subjected to charging circuit 411 controls, the output of this circuit conditioning DC-DC converter 402.Charging circuit 411 comprises a enable circuits 404 in another embodiment of this detailed description.
DC-DC converter 402 can be the DC-DC converter that is subjected to any type that various control signal controls.DC-DC converter 402 can be a synchronous rectifier converter known in the art, and this converter contains a high-side switch K1, a low side switch K2, an inductance 408, and an electric capacity 406.One control signal from charging circuit 411 exports low side switch K1 and high-side switch K2 control end separately to from low side 415 and high side 417 respectively.In an example, K switch 1, K2 can be the transistor of any type, for example MOS transistor.Control signal can be a pwm signal, the duration of its work period control " switch closure " state (high-side switch K1 closure, low side switch K2 disconnect) and " switch disconnection " state (high-side switch K1 disconnection, low side switch K2 closure), and the output voltage values and the current value of DC-DC converter 402.
If the electric charge on the electric capacity 406 of DC-DC converter 402 is greater than reference value, battery 440 not with the output electric coupling of DC-DC converter 402 (K switch 3 and K4 disconnect), and charging circuit 411 indication DC-DC converters 402 are converted to a switch off state, and electric capacity 406 makes current discharge to ground by inductance 408 and Closing Switch K2.May cause the power rating of not expecting of charging circuit 411 ports 418 and 419 like this, port 418 and 419 be connected to detect resistance 449 two ends.For example, because lc circuit in parallel (comprising inductance 408 and electric capacity 406) can produce negative voltage transition and negative current vibration at port 418.
Charging circuit 411 can comprise another embodiment of an enable circuits 404, and embodiment is similar to other enable circuits, stops the power rating of not expecting at port 418,419 in this example.Usually, during a soft start state, enable circuits 404 is compared the electric charge of electric capacity 406 with reference charge, and up to the electric charge of electric capacity 406 less than reference charge, just make charging current 411 control DC-DC converters 402.Therefore, the high-side switch K1 of DC-DC converter 402 and low side switch K2 can keep disconnecting, and receive enable signal from enable circuits 404 up to controller 490.
Enable circuits 404 generally includes a comparator circuit 432, one on-off circuits 434, one discharge paths 436, and an output decision circuitry 438.Comparator circuit 432 comprises comparer 433.Comparer 433 its in the same way (non inverting) input end receive first signal of the electric charge of an expression electric capacity 406.Comparer 433 receives also that at its reverse (inverting) input end one represents the secondary signal of reference charge, and Vdsch represents by signal.Comparer 433 is these signals relatively, and relatively provide an output comparison signal to on-off circuit 434 according to this.
On-off circuit 434 can receive the output comparison signal and the soft-start signal of comparator circuit 432, for example the signal that is provided by primary power administrative unit (PMU) 480.Then on-off circuit 434 will provide one first to output signal to output decision circuitry 438 by path 483, and one second K switch 5 that outputs signal to discharge path 436.K switch 5 can be the transistor of any type, for example a MOS transistor.On-off circuit 434 can comprise a rest-set flip-flop 435.The set of trigger 435 (set) end can receive soft-start signal, and reset terminal (reset) can receive comparison output signal simultaneously.The output terminal QB of trigger 435 provides first to output signal to output decision circuitry 438, and simultaneously another output terminal Q provides second K switch 5 that outputs signal to discharge path 436.
Output decision circuitry 438 can comprise the circuit of any type of realizing an expectation logic function.In one embodiment, output decision circuitry 438 can comprise one with the door G1.Output decision circuitry 438 provides a charging enable signal chgen controller 490 to charging circuit 411.If the charging enable signal be a numeral 1, so controller 490 can control DC-DC converter 402 switch to K1, K2, for example pass through a pwm control signal.If the charging enable signal is a numeral 0, controller 490 can not gauge tap disconnect keeping K1, K2 and this switch.Controller 490 can comprise that the element of any type is used to provide and control signal to switch, for example a pwm signal.For example, controller 490 can comprise a plurality of error amplifiers, is used for the input signal of comparison monitoring parameter (not shown) and the relevant max-thresholds of each parameter.A plurality of error amplifiers can constitute simulation " line or (wired-OR) " topology, and first detects the work period that an error amplifier that surpasses relevant max-thresholds state is controlled this pwm control signal like this.
At work, DC-DC converter 402 is not worked at first, and K switch 1 and K2 are in off-state.In addition, K switch 3 and K4 disconnect.During this time, digital 1 soft-start signal is received at the set end of trigger 435 by the request of PMU 480.Then, the output Q of trigger 435 is set to numeral 1, and another output QB is for being set to numeral 0.In response, K switch 5 closures of discharge path 436 cause the electric charge of electric capacity 406 to be discharged to ground by the path that is made of Closing Switch K5.In addition because output QB be a numeral 0, no matter what is from the CHGON HOST signal of PMU 480, with the output of door G1 also will be digital 0.Controller 490 then response from numeral 0 signal of door G1, no longer gauge tap K1, K2, so this controller maintained switch K1, K2 are in an off-state.
The electric charge of electric capacity 406 continues to be discharged, and is discharged to a safety value that is lower than the reference charge value up to it.In case capacitance charge is less than the reference charge value, the output Q of trigger 434 will be numeral 0, and another output QB will be numeral 1.Therefore, the K5 of discharge path will disconnect.If the CHG ON HOST signal from PMU 480 also is a numeral 1, the output (enable signal) with door G1 also will be numeral 1 so.In response, controller 490 is with the state of controllable switch K1 and K2, for example by a pwm control signal.More advantageously, if controller 490 provides a pwm signal that K switch 1 and K2 are placed a switch off state in this example, disadvantageous power rating will can not take place at port 418,419, because the electric charge of electric capacity 406 is bled off fully.
Embodiment described herein is some examples among many employings embodiment of the present utility model, and these embodiment are used for explaining, but are not limited to this.Obviously, many other embodiment well known to those skilled in the art do not break away from spirit and scope of the present utility model.
Claims (13)
1, a kind of enable circuits, described enable circuits make a DC-DC converter controlled by a control signal, and described DC-DC converter contains an electric capacity that is coupled to its output terminal, it is characterized in that described enable circuits comprises:
One comparator circuit is used for first comparison signal of the described capacitance charge of comparison one expression and second comparison signal of an expression one reference charge, and the described comparison output signal that relatively provides is provided;
One on-off circuit is used for receiving described comparison output signal, and if described capacitance charge less than described reference charge, then respond described comparison output signal at least and provide one first switching signal at one first state; With
One output decision circuitry is used for receiving described at least first switching signal, and described first switching signal that responds under described first state provides an enable signal, makes described DC-DC converter controlled by described control signal.
2, enable circuits according to claim 1, it is characterized in that: described output decision circuitry also receives a status signal, if and described first switching signal is in described first state, described status signal is in the state that charged state is expected in an expression one, described output decision circuitry then provides described enable signal.
3, enable circuits according to claim 2 is characterized in that: described output decision circuitry comprise one with door, describedly receive described first switching signal and a described status signal with door.
4, enable circuits according to claim 1, it is characterized in that: if described capacitance charge is greater than described reference charge, described on-off circuit then also provides one second switching signal at one first state, if described capacitance charge is less than described reference charge, described on-off circuit then also provides one second switching signal at one second state, and described enable circuits also comprises a discharge path, if described second switching signal is in described first state, described path then responds described second switching signal to described capacitor discharge.
5, enable circuits according to claim 4, it is characterized in that: described discharge path comprises a switch, if described second switching signal is in described first state, described switch then responds described second switching signal and closure, if described second switching signal is in described second state, described switch then disconnects.
6, enable circuits according to claim 1 is characterized in that: described on-off circuit comprises a rest-set flip-flop.
7, a kind of battery charger is characterized in that described battery charger comprises:
One DC-DC converter, be used for receiving a power input value from a direct current power supply, and provide stable output power value to a rechargeable battery, described DC-DC converter to contain an electric capacity that is coupled to described DC-DC converter output terminal; With
One enable circuits makes described DC-DC converter controlled by a control signal, and described enable circuits comprises:
One comparator circuit is used for first comparison signal of the described capacitance charge of comparison one expression and second comparison signal of an expression one reference charge, and the described comparison output signal that relatively provides is provided;
One on-off circuit is used for receiving described comparison output signal, and if described capacitance charge less than described reference charge, then respond described comparison output signal at least and provide one first switching signal at one first state; With
One output decision circuitry is used for receiving described at least first switching signal, and described first switching signal that responds under described first state provides an enable signal, makes described DC-DC converter controlled by described control signal.
8, battery charger according to claim 7, it is characterized in that: described output decision circuitry also receives a status signal, if and described first switching signal is in the state that described first state, described status signal are in an expression one ideal charging state, described output decision circuitry then provides described enable signal.
9, battery charger according to claim 8 is characterized in that: described output decision circuitry comprise one with door, describedly receive described first switching signal and a described status signal with door.
10, battery charger according to claim 7, it is characterized in that: if described capacitance charge is greater than described reference charge, described on-off circuit then also provides one second switching signal at one first state, if described capacitance charge is less than described reference charge, described on-off circuit then provides one second switching signal at one second state, and described enable circuits also comprises a discharge path, if described second switching signal is in described first state, described path then responds described second switching signal to described capacitor discharge.
11, battery charger according to claim 10, it is characterized in that: described discharge path comprises a switch, if described second switching signal is in described first state, described switch then responds described second switching signal and closure, if described second switching signal is in described second state, described switch then disconnects.
12, battery charger according to claim 7 is characterized in that: described on-off circuit comprises a rest-set flip-flop.
13, battery charger according to claim 7 is characterized in that: described control signal comprises a pulse-width signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200008635U CN2809694Y (en) | 2005-01-14 | 2005-01-14 | Enable circuit for eliminating negative voltage transient and battery charging unit therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200008635U CN2809694Y (en) | 2005-01-14 | 2005-01-14 | Enable circuit for eliminating negative voltage transient and battery charging unit therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2809694Y true CN2809694Y (en) | 2006-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200008635U Expired - Lifetime CN2809694Y (en) | 2005-01-14 | 2005-01-14 | Enable circuit for eliminating negative voltage transient and battery charging unit therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2809694Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420132C (en) * | 2004-01-15 | 2008-09-17 | 美国凹凸微系有限公司 | Enabling circuit for avoiding negative voltage transients and battery recharging system |
| CN108710400A (en) * | 2018-06-04 | 2018-10-26 | 电子科技大学 | A kind of enabled circuit can be used for negative voltage output |
| CN109072459A (en) * | 2016-05-18 | 2018-12-21 | 株式会社斗山 | Alkaline water electrolytic device and its driving method |
-
2005
- 2005-01-14 CN CNU2005200008635U patent/CN2809694Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420132C (en) * | 2004-01-15 | 2008-09-17 | 美国凹凸微系有限公司 | Enabling circuit for avoiding negative voltage transients and battery recharging system |
| CN109072459A (en) * | 2016-05-18 | 2018-12-21 | 株式会社斗山 | Alkaline water electrolytic device and its driving method |
| CN109072459B (en) * | 2016-05-18 | 2020-12-01 | 株式会社斗山 | Alkaline water electrolysis device and driving method thereof |
| CN108710400A (en) * | 2018-06-04 | 2018-10-26 | 电子科技大学 | A kind of enabled circuit can be used for negative voltage output |
| CN108710400B (en) * | 2018-06-04 | 2020-02-18 | 电子科技大学 | Enabling circuit capable of being used for negative voltage output |
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| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: YINGSHU CAYMAN CONCAVE CONVEX MICRO INTERNATIONAL Free format text: FORMER OWNER: AMERICA CONCAVE-CONVEX MICROSYSTEM INC. Effective date: 20070511 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20070511 Address after: Cayman Islands (Great Britain) Grand Cayman Patentee after: O2 Micro Internat Ltd. Address before: American California Patentee before: O2 Micro Inc |
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| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080917 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |