CN1812221A - Charging/discharging control circuit and charging type electric power supply device - Google Patents
Charging/discharging control circuit and charging type electric power supply device Download PDFInfo
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- CN1812221A CN1812221A CN 200510129094 CN200510129094A CN1812221A CN 1812221 A CN1812221 A CN 1812221A CN 200510129094 CN200510129094 CN 200510129094 CN 200510129094 A CN200510129094 A CN 200510129094A CN 1812221 A CN1812221 A CN 1812221A
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Abstract
A charge/discharge control circuit has a circuit structure having another return detection voltage different from a detection voltage for detecting an over-current when returning from an over-current state to a normal state. With the structure, the charge/discharge control circuit surely returns from the over-current state to the normal state even it a load of 1 MOMEGA or less in a low impedance is opened.
Description
The present patent application is to be that May 12 calendar year 2001, application number are that of patent application of the same name of 01121256.X divides an application the applying date.
Technical field
The present invention relates to a kind of charging/discharging control circuit, operate the charge/discharge that can control storage battery by the on/off of switching circuit, and a kind of rechargeable power circuit that uses sort circuit.
Background technology
As the charging type power apparatus of the routine that is made of storage battery, what known is the supply unit shown in the circuit block diagram of Fig. 2.This structure discloses in the flat 4-75430 of the Japanese uncensored patent gazette that for example is entitled as " charging type power apparatus ".Just, storage battery 101 through switching circuit 103 connect external terminal-VO 105 or+VO 104.Charging and charge/discharge control circuit 102 also are connected in parallel with storage battery 101.
Charging/discharging control circuit 102 has the function of the voltage that detects storage battery 101.(cell voltage is higher than a kind of state of given magnitude of voltage to be in overcharge condition at storage battery; Hereinafter referred to as " additives for overcharge protection state ") or (cell voltage is lower than a kind of state of given magnitude of voltage to be in over-discharge state; Hereinafter referred to as " over state ") situation under, signal of charging/discharging control circuit 102 output disconnects switching circuit 103.In addition, when external terminal+VO 104 reached certain voltage, if discharge operation stops, it can limit the electric current of the switching circuit 103 of flowing through.In other words, discharge operation can stop (crossing current control) when the electric current of the switching circuit 103 of flowing through is excessive.This state is hereinafter referred to as " overcurrent protection state ".
As another example of the normal charge formula supply unit that is made of storage battery, what also know is the supply unit shown in the circuit block diagram of Fig. 3.Designing this circuit is connected in series the negative pole 111 of the switching circuit shown in Fig. 2 103 with storage battery.
Fig. 4 has shown the conventional example of the circuit block diagram of a concrete charging/discharging control circuit.Storage battery 101 is connected to an external terminal-VO 105 through switching circuit 103.Switching circuit 103 is made up of two n channel fets (field-effect transistor).The voltage that charging/discharging control circuit 102 detects on the storage battery 101.Charging/discharging control circuit 102 is by the detection comparator 119 that overcharges, an overdischarge detection comparator 118, an overcurrent detection comparator 117, a reference voltage circuit A 116, a reference voltage circuit B 114,120, one bleeder circuit B121 of a bleeder circuit A, output logic control circuit 124 compositions such as grade.Charging/discharging control circuit 102 is connected to switching circuit 103 so that the on/off signal of transmit button circuit 103 by holding wire 107A and 107B.The charger that storage battery 101 is charged and the equipment that can drive by storage battery 101 (load of seeing from storage battery) be connected external terminal+VO 104 and-VO 105 between.FET-A 112 and FET-B 113 be connected in series to external terminal-VO 105 or+VO 104.
Overcharge detection comparator 119 and overdischarge detection comparator 118 has a function, can the voltage on voltage on the storage battery 101 and the reference voltage circuit 116 be compared.Output separately sends a signal to terminal 125A and 125B according to comparator 119 and 118 owing to output logic control circuit 124, and FET grid voltage separately is according to each state variation, so that the operation of the charge/discharge of on/off storage battery.For example, in overcharge condition, the positive input terminal voltage of the detection comparator 119 that overcharges is higher than the voltage of reference voltage circuit 116, and the output of comparator 119 is from the low height that transforms to.When output signal is input to output logic control circuit 124, the grid voltage of the FET-B113 in switching circuit from hypermutation to low.As a result, discharging current does not flow into storage battery 101, thereby stops charging operations.
Although the switching circuit above replacing with FET realizes that switch is possible, need to change the grid current potential of FET and base potential so that reach above-mentioned result.If do not carry out above-mentioned change, because the source potential of FET is higher than drain potential, above-mentioned charge/discharge control is impossible.At present, adopt two FET to control charge/discharge usually.
Yet, in the control circuit of the charge/discharge that constitutes like this, when load exceeds overcurrent protection state and charging/discharging control circuit and turns back to normal condition, with the following shortcoming that occurs with reference to figure 4 narrations.
When load exceeds the overcurrent protection state,, need make the voltage of external terminal-VO 105 become the voltage Va of reference voltage B 114 or lower for charging/discharging control circuit can recover automatically.For this reason, when load exceeded the overcurrent protection state, open-circuit impedance must be a steady state value (Ra) or greater than resistance 127 (Rb).If storage battery 101 is Vb, Ra can be expressed from the next.
Ra＞Rb(Vb/Va-1) …(1)
In course of normal operation, Vb is set to about 3.5V usually.Under the situation that charge is made up of semiconductor integrated circuit, when charger 108 is connected to charge, because the current potential of external terminal-VO 105 becomes the current potential of the negative pole 111 that is lower than storage battery, and electric current is from the drain electrode of FET-C 126 resistance 127 (Rb) of flowing through, and Rb is set as about 100K Ω usually so that limit this electric current.Va is made as about 0.1V usually, and its value is based on the resistance of FET-A 112 and FET-B 113 and flow through that the electric current of resistance is provided with.
If value above-mentioned is input in the formula (1), Ra is expressed as follows:
RA＞100KΩ(3.5V/0.1-1)＝3.4MΩ
Summary of the invention
According to the characteristic such as the substrate of installing, actual open-circuit impedance might become 1M Ω or be lower than 1M Ω, and only when load exceeds the overcurrent protection state, charging/discharging control circuit can not turn back to normal state.Therefore, an object of the present invention is to solve this technical problem.
To achieve these goals,, provide a kind of charging/discharging control circuit according to the present invention, when charging type power apparatus when overcurrent condition turns back to normal condition, another with detection voltage of being different from detection of excessive current returns detection voltage.
According to a kind of charging/discharging control circuit of the present invention, can control the current limiting device of the electric current that is used to regulate the storage battery that can charge and discharge, and can monitor any one or two in the voltage and current of described storage battery, described charging/discharging control circuit comprises: an overcurrent detecting device is used to monitor that the overcurrent that can be discharged by described storage battery is as information of voltage; Wherein the voltage that increases with discharging current that is detected by described overcurrent detecting device and described overcurrent detecting device are different with the voltage of discharging current minimizing when detected state returns.
According to a kind of charging/discharging control circuit of the present invention, can control the current limiting device that is used to regulate the battery current that can charge and discharge, and can monitor any one or two in the voltage and current of described storage battery, described charging/discharging control circuit comprises: an overcurrent detecting device is used to monitor that the overcurrent that can be discharged by described storage battery is as information of voltage; Wherein the absolute value of voltage that increases with discharging current that is detected by described overcurrent detecting device is greater than the absolute value of voltage that reduces with discharging current when detected state returns by described overcurrent detecting device.
According to a kind of charging type power apparatus of the present invention, has a storage battery that can charge and discharge, a current limiting device, be used to regulate the electric current of described storage battery, with a charging/discharging control circuit, can monitor described current limiting device and can monitor any one or two at the positive pole of described storage battery external terminal and the voltage and current between the negative pole, wherein said charging/discharging control circuit comprises one according to charging/discharging control circuit of the present invention.
The beneficial effect of charging/discharging control circuit of the present invention is to have only when the open-circuit impedance of charging type power apparatus is hanged down, and charging/discharging control circuit is guaranteed to return normal state from the overcurrent protection state.
Description of drawings
The present invention will be more obvious in these and other purpose and advantage from following detailed description in conjunction with the accompanying drawings, wherein:
Fig. 1 is the key diagram of expression according to the circuit square frame example of a charging type power apparatus of the present invention;
Fig. 2 is the key diagram of the circuit square frame example of a conventional charging type power apparatus of expression;
Fig. 3 is the key diagram of another circuit square frame example of the conventional charging type power apparatus of expression;
Fig. 4 is the key diagram of another circuit square frame example of the conventional charging type power apparatus of expression;
Fig. 5 is the key diagram of expression according to another circuit square frame example of charging type power apparatus of the present invention;
Fig. 6 is the again key diagram of another circuit square frame example of expression according to charging type power apparatus of the present invention;
Fig. 7 is the again key diagram of another circuit square frame example of expression according to charging type power apparatus of the present invention;
Fig. 8 is the again key diagram of another circuit square frame example of expression according to charging type power apparatus of the present invention;
Fig. 9 is the again key diagram of another circuit square frame example of expression according to charging type power apparatus of the present invention;
Figure 10 is the again key diagram of another circuit square frame example of expression according to charging type power apparatus of the present invention.
Embodiment
With reference now to accompanying drawing, the preferred embodiments of the present invention is described in more detail.
Fig. 1 is the circuit square frame exemplary plot of explanation according to a charging type power apparatus of the present invention.
In the circuit that Fig. 1 shows, overcurrent returns detection comparator 128 and a reference voltage C 129 is added in the circuit of Fig. 4.Reference voltage C 129 is set as voltage Vc, and it is higher than reference voltage B 114.When having served as current sense comparator 117 and having detected an overcurrent, overcurrent is returned detection comparator 128 and is in and returns detected state, and FET-A 112 not output logic control circuit 124 connects, up to overcurrent return detection comparator 128 oppositely till so that do not break down.Equally, FET-A 112 does not disconnect the time reversal that returns in overcurrent up to overcurrent detection comparator 117.In this case, if Vc is 1V, open-circuit impedance Ra is represented by following expression (1):
Ra＞100KΩ(3.5V/1V-1)＝0.25MΩ
In this case, the voltage in overcurrent test side 115, promptly the return voltage that detects from overcurrent is 1V.
As mentioned above, because it is 0.1V that overcurrent detects voltage, and the return voltage that detects from overcurrent is 1V, even the open-circuit impedance of load is 1M Ω or is less than 1M Ω, charge must turn back to normal condition from overcurrent condition, and this is conspicuous.
Fig. 5 is explanation another circuit square frame exemplary plot according to charging type power apparatus of the present invention.
Be with the difference of the circuit of Fig. 1, switching circuit 103 is made up of a FET-D 132 and FET-E 133 of P channel fet, and the structure of charging/discharging control circuit 102 changes with the need so that the switching circuit of being made up of the P channel fet 103 is controlled.The detection comparator 119 that overcharges, an overdischarge detection comparator 118, a reference voltage circuit A 116, a bleeder circuit A 120,121, one hysteresis circuit A 122 of a bleeder circuit B and a hysteresis circuit B 123 have formed one jointly and have overcharged/discharge detection circuit 141.
Except a benchmark changed to the positive voltage terminal of storage battery 101, the work of overcurrent sensing circuit 142 was identical with the circuit shown in Fig. 1.Overcurrent detection comparator 117 relatively external terminal+VO 104 is exported a signal to output logic control circuit 144 with the voltage of reference voltage B 114 and according to each state.At the overcurrent protection state, signal of output logic control circuit 144 transmissions, sends a signal simultaneously to FET-F 156, thereby promotes external terminal+VO 104 by resistance 127 so that stop discharge operation to FET-D 132.After detecting overcurrent, when load 109 exceeds the overcurrent protection state, need reduce the voltage of external terminal+VO 104 so that be stabilized in the voltage of reference voltage B 114 or lower and return this state to normal condition.
The reference voltage C 129 that is made as voltage Vc is higher than reference voltage B 114.When having served as current sense comparator 117 and having detected overcurrent, overcurrent is returned detection comparator 128 and is in a kind of detected state that returns, and FET-D 132 not output logic control circuit 144 connects, up to overcurrent return detection comparator 128 oppositely till so that do not break down.Similarly, FET-D 132 does not disconnect up to overcurrent detection comparator 117 till the time reversal that overcurrent is returned.In this case, open-circuit impedance Ra to be representing with the same way as of expression formula (1), and Ra is by using above-mentioned Rb, and the value of Vb and Vc is the same with the expression among Fig. 1.
Ra＞100KΩ(3.5V/1V-1)＝0.25MΩ
In this case, the voltage in overcurrent test side 115, promptly the return voltage that detects from overcurrent is 3.5 to 1V.
As mentioned above, because it is 3.5 to 0.1V and the return voltage that detects from overcurrent is 3.5 to 1V that overcurrent detects voltage, even the open-circuit impedance of load is 1M Ω or is less than 1M Ω, charge must turn back to normal condition from overcurrent condition, and this is conspicuous.
As mentioned above, even under the situation that switching circuit 103 is made up of the P channel fet, it is obvious carrying out identical operation.
Fig. 6 is explanation another circuit square frame exemplary plot according to charging type power apparatus of the present invention.
The circuit of Fig. 6 has increased in the circuit of a resistance 161 to Fig. 4.Resistance 161 is connected between the input and resistance 127 of overcurrent test side 115 and overcurrent detection comparator 117.Under the situation of carrying out detection of excessive current, because FET-C 126 disconnects, when having served as current detecting end 115 and becoming the current potential of reference voltage B 114 among Fig. 4, overcurrent is detected.On the other hand, detecting under the situation about returning from overcurrent, because FET-C126 connects, when the current potential that has served as current detecting end 115 was higher than reference voltage B 114, charge was returned.
Suppose that open-circuit impedance is not Ra when load is inconsistent, the resistance of resistance 127 is Rb, and the resistance of resistance 161 is Rc, is Vb if the voltage of reference voltage B 114 is the voltage of Va and storage battery 101, and Ra can represent with following formula.
Ra＞Rb(Vb/Va-1)-Rc …(2)
In this case, the voltage of overcurrent test side 115, promptly detect the voltage Vd that returns from overcurrent and be expressed as follows:
Vd＜(Rb+Rc)/Rb*Va …(22)
In this expression formula, for example, suppose Rb=10K Ω, Rc=90K Ω, Va=0.1V and Vb=3.5V,
Ra＞10KΩ(3.5V/0.1V-1)-90KΩ＝0.25MΩ
Vd＜(10KΩ+90KΩ)/10KΩ*0.1V＝1V
As mentioned above, because it is 0.1V that overcurrent detects voltage, and the return voltage that detects from overcurrent is 1V, even the open-circuit impedance of load is 1M Ω or is less than 1M Ω, charge must turn back to normal condition from overcurrent condition, and this is conspicuous.
In addition, because Rb+Rc=100K Ω, the input impedance of overcurrent test side 115 is identical with impedance among Fig. 4.By the way, because Rb and Rc can arbitrarily be provided with, returning required open-circuit impedance from the overcurrent detection can arbitrarily be provided with according to purposes.
Fig. 7 is explanation another circuit square frame exemplary plot again according to charging type power apparatus of the present invention.
In Fig. 7, the structure that use is formed the charging type power apparatus of switching circuit 103 by the P-channel fet becomes identical with the structure of Fig. 6.Obviously carry out with Fig. 6 identical operations.
Fig. 8 is explanation another circuit square frame exemplary plot again according to charging type power apparatus of the present invention.
The circuit of Fig. 8 has the two function of Fig. 1 and Fig. 6.
Suppose that open-circuit impedance is Ra when load exceeds, the resistance of resistor 127 is Rb, and the resistance of resistor 161 is Rc, and the voltage of storage battery 101 is that the voltage of Vb and reference voltage C 129 is Vc, and Ra can be represented by the formula.
Ra＞Rb(Vb/Vc-1)-Rc …(3)
In this case, the voltage of overcurrent test side 115, promptly detect the voltage Vd that returns from overcurrent and be expressed as follows:
Vd＜(Rb+Rc)/Rb*Vc …(22)
In this expression formula, for example, suppose Rb=136K Ω, Rc=90K Ω, Vb=3.5V, and Vc=1V,
Ra＞136KΩ(3.5V/1V-1)-90KΩ＝0.25MΩ
Vd＜(136KΩ+90KΩ)/136KΩ*1V＝1.66V
As mentioned above, because it is 0.1V that overcurrent detects voltage, and the return voltage that detects from overcurrent is 1.66V, even the open-circuit impedance of load is 1M Ω or is less than 1M Ω, charge must turn back to normal condition from overcurrent condition, and this is conspicuous.
In addition because Rb+Rc=226K Ω, even have with other examples in identical return impedance, the input impedance of overcurrent test side 115 can be set to height.When charger 108 is connected to charge, be lower than the current potential of battery terminal negative by the current potential that makes external terminal-VO105, in charge 102 is under the situation about being formed by semiconductor integrated circuit, and this electric current that flows through the parasitic diode of FET-C 126 for restriction is effective.
Fig. 9 is explanation another circuit square frame exemplary plot again according to charging type power apparatus of the present invention.
In Fig. 9, the structure that use is formed the charging type power apparatus of switching circuit 103 by the P channel fet becomes identical with the structure of Fig. 8.Obviously carry out operation identical operations with Fig. 8.
Figure 10 is expression another circuit square frame exemplary plot again according to charging type power apparatus of the present invention.
The circuit of Figure 10 is adjusted circuit 162 to a return voltage and is increased in the circuit of Fig. 6.Return voltage is adjusted circuit 162 and for example can be made up of a fuse, with the ratio of resistor 127 and resistor 161 can be by disconnecting a fuse and regulating arbitrarily arbitrarily, and regulate the return voltage that detects from overcurrent so that respond the request of various open-circuit impedances fast.Much less, return voltage is adjusted circuit 162 and can be used for other embodiment except that Fig. 6 embodiment.
In addition, return voltage is adjusted circuit 162 and can be made of circuit arbitrarily, as long as this circuit can be regulated return voltage, and the present invention is not limited to these embodiment.
In addition, float in order stably to control the excessive voltage that causes owing to various factors, comprise because the interpolation of load 109 above-mentioned and charger 108/remove caused, it is effective partly increasing a delay circuit at the needs of the charging/discharging control circuit 102 of this embodiment.
For example,, output to FET-A 112 up to a signal because detection signal and inverse signal are input to output logic control circuit 24, FET-B 113 and FET-C 126, if increase a suitable delay circuit, can very stable controlling.
The circuit of this embodiment has solved the problem that custom circuit exists, and is aforesaid, and all environment that use storage battery are not had bad influence.
Above-mentioned all embodiment control the work of the charge/discharge of storage battery.Yet, even a plurality of batteries are connected in series,, make the voltage of each battery to detect by charging/discharging control circuit 102 if change structure, charge can constitute simply, and also is effective in the such structure of the present invention.
In this embodiment, charging/discharging control circuit also can be made of a C-MOS (complementary metal-oxide-semiconductor) circuit except can being made of a bipolar transistor, and realizes it being easy.
In addition, when charge when overcurrent condition turns back to normal condition, if another that constitutes that the present invention makes that it has the detection voltage that is different from detection of excessive current returns detection voltage, can use any other circuit structure, and the present invention is not limited to the above embodiments.
As mentioned above, according to the present invention, even make load open circuit by a resistance that is equal to or less than 1M Ω, charge must turn back to normal condition from overcurrent condition, thereby has improved reliability of products.
For the purpose that illustrates and narrate, the description of front has provided a plurality of embodiment of the present invention.Not exclusively or to limit the invention in disclosed form accurately, and the enlightenment that maybe can from the present invention practice, obtain according to above-mentioned instruction, various modifications and variations are possible.Selecting and describing embodiment only is in order to explain principle of the present invention and practical application thereof, makes those of ordinary skill in the art can utilize the present invention of various embodiment and has the various modifications that are suitable for specific application.Protection scope of the present invention is limited by appended claim or the scope equivalent with it.
Claims (4)
1. a charging/discharging control circuit is used for the charging and the discharge of storage battery, comprising:
First external terminal is connected to described storage battery by switching circuit;
Second external terminal is connected to the opposite side of described storage battery;
Resistance circuit is connected between described first external terminal and the described storage battery;
Overcurrent sensing circuit, be used for to detect voltage by the electric current of described storage battery in the overcurrent that described switching circuit produced and compare, and be used to control described switching circuit just stops described storage battery when the overcurrent detection of described overcurrent sensing circuit detects described overcurrent detection voltage is higher than described first reference voltage electric current with one first reference voltage; With
Overcurrent is returned testing circuit, be used for and compare with one second reference voltage at the overcurrent return voltage that described resistance circuit produced by the electric current of described storage battery, and being used to control described switching circuit returns testing circuit when described overcurrent and detects and allow the electric current of described storage battery to flow through when described overcurrent return voltage is lower than described second reference voltage
Wherein, described first reference voltage is lower than described second reference voltage.
2. charging/discharging control circuit as claimed in claim 1, also comprise a transistor that is connected in series with described resistance circuit, wherein produce an overcurrent return voltage owing to the operation of described transistor between described overcurrent detection period makes described resistance circuit.
3. charging/discharging control circuit as claimed in claim 1, the voltage of wherein said storage battery are 3.5 volts, and described first reference voltage is 0.1 volt, and described second reference voltage is 1.0 volts, and the resistance of described resistance circuit is 100 kilo-ohms.
4. a charging type power apparatus has storage battery, switching circuit and charging/discharging control circuit as claimed in claim 1.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP139310/2000 | 2000-05-12 | ||
| JP2000139310 | 2000-05-12 | ||
| JP44067/2001 | 2001-02-20 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01121256A Division CN1324132A (en) | 2000-05-12 | 2001-05-12 | Charging/discharging control circuit and charging type electric power supply device |
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| Publication Number | Publication Date |
|---|---|
| CN1812221A true CN1812221A (en) | 2006-08-02 |
| CN100394670C CN100394670C (en) | 2008-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101290943A Expired - Lifetime CN100394670C (en) | 2000-05-12 | 2001-05-12 | Charging/discharging control circuit and charging type electric power supply device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123356B (en) * | 2006-08-11 | 2011-10-05 | 精工电子有限公司 | Charging and discharging control circuit and charging type power supply device |
| CN105098873A (en) * | 2014-05-14 | 2015-11-25 | 精工电子有限公司 | Charge and discharge control circuit and battery device |
| CN106451493A (en) * | 2015-08-13 | 2017-02-22 | 中国电力科学研究院 | Method for variable frequency air conditioner participating in power and frequency control of power system |
| CN110190840A (en) * | 2018-02-22 | 2019-08-30 | 株式会社自动网络技术研究所 | Control device |
| CN110912212A (en) * | 2018-09-17 | 2020-03-24 | 硕天科技股份有限公司 | Charging device with adaptive current-limiting protection function and handheld electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3082209B1 (en) | 2013-12-13 | 2022-05-11 | Hytera Communications Corp., Ltd. | Overcurrent protection circuit and method for battery discharge |
| DE102014225431B4 (en) * | 2014-12-10 | 2021-02-04 | Volkswagen Aktiengesellschaft | Device and method for separating and connecting two sub-electrical systems |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3277566B2 (en) * | 1992-09-17 | 2002-04-22 | ソニー株式会社 | Battery protection circuit |
| JP3172095B2 (en) * | 1996-06-14 | 2001-06-04 | セイコーインスツルメンツ株式会社 | Charge / discharge control circuit and rechargeable power supply |
| JPH10285810A (en) * | 1997-04-07 | 1998-10-23 | Seiko Instr Inc | Charge and discharge controlling circuit and charging system power device |
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2001
- 2001-05-12 CN CNB2005101290943A patent/CN100394670C/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123356B (en) * | 2006-08-11 | 2011-10-05 | 精工电子有限公司 | Charging and discharging control circuit and charging type power supply device |
| CN105098873A (en) * | 2014-05-14 | 2015-11-25 | 精工电子有限公司 | Charge and discharge control circuit and battery device |
| CN106451493A (en) * | 2015-08-13 | 2017-02-22 | 中国电力科学研究院 | Method for variable frequency air conditioner participating in power and frequency control of power system |
| CN106451493B (en) * | 2015-08-13 | 2019-02-05 | 中国电力科学研究院 | A kind of method that convertible frequency air-conditioner participates in the control of Power Systems frequency |
| CN110190840A (en) * | 2018-02-22 | 2019-08-30 | 株式会社自动网络技术研究所 | Control device |
| CN110190840B (en) * | 2018-02-22 | 2022-12-02 | 株式会社自动网络技术研究所 | Control device |
| CN110912212A (en) * | 2018-09-17 | 2020-03-24 | 硕天科技股份有限公司 | Charging device with adaptive current-limiting protection function and handheld electronic device |
| CN110912212B (en) * | 2018-09-17 | 2021-07-20 | 硕天科技股份有限公司 | Charging device with adaptive current-limiting protection function and handheld electronic device |
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| Publication number | Publication date |
|---|---|
| CN100394670C (en) | 2008-06-11 |
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Effective date of registration: 20160309 Address after: Chiba County, Japan Patentee after: SEIKO INSTR INC Address before: Chiba County, Japan Patentee before: Seiko Instruments Inc. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Chiba County, Japan Patentee after: EPPs Lingke Co. Ltd. Address before: Chiba County, Japan Patentee before: SEIKO INSTR INC |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080611 |