CN101430570A - Power supply circuit capable of generating output voltage close to zero and its regulation method - Google Patents
Power supply circuit capable of generating output voltage close to zero and its regulation method Download PDFInfo
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Abstract
The invention relates to a power circuit which can generate an output voltage approaching to zero and an adjustment method thereof. The power circuit comprises a voltage stabilizer, a divider circuit and a gain circuitry; the voltage stabilizer comprises an input terminal, an output terminal and an adjustment terminal, wherein, the input terminal receives an input voltage and the output terminal outputs an output voltage; the divider circuit which is coupled between the output terminal and the ground and uses the output outage to generate a divider voltage; the gain circuitry which is coupled between the adjustment terminal and the divider voltage for receiving the divider voltage generated by the divider circuit to adjust a gain of the output voltage corresponding to a reference voltage. With the invention adopted, the output voltage of the power circuit can be adjusted to be close to zero. The power circuit which can generate the output voltage approaching to zero and the adjustment method thereof have simple technical principle, can be applied to a plurality of reduction voltage stabilizers and provide great convenience, thereby improving the industry greatly.
Description
Technical field
This case is a kind of power circuit and its method of adjustment, more particularly, the invention relates to a kind of the generation and levels off to power circuit and its method of adjustment of zero output voltage.
Background technology
Now, the power circuit (Adjustable Voltage Power Circuit) of general adjustable-voltage promptly as shown in Figure 1, power circuit 1 comprises a voltage stabilizer 10 and a bleeder circuit 11, wherein voltage stabilizer 10 has an input end IN, one output terminal OUT, one adjusts an end ADJ and an earth terminal GND, and bleeder circuit 11 has one first resistance R 1 and one second resistance R 2, input end IN is in order to receive an input voltage Vi, output terminal OUT is in order to export an output voltage V o, earth terminal GND is used for ground connection, first resistance R 1 is coupled between the output terminal OUT and second resistance R 2, have a node 12 between first resistance R 1 and second resistance R 2 and be coupled to adjustment end ADJ, and second resistance R 2 is connected to ground.
According to shown in Figure 1, after output voltage V o carries out dividing potential drop via first resistance R 1 in the bleeder circuit 11 and second resistance R 2, produce branch pressure voltages and feed back to the reference voltage Vref comparison of adjusting end ADJ and voltage stabilizer 10 at node 12, in case this branch pressure voltage is less than reference voltage Vref, will order about output voltage V o increases, and when this branch pressure voltage during greater than reference voltage Vref, will order about output voltage V o and reduce.
Its identical relation is as follows:
Identical relation is known thus, so can change output voltage V o as long as change the ratio of first resistance R 1 and second resistance R 2.
Therefore, if the resistance value of first resistance R 1 during much smaller than the resistance value of second resistance R 2 (R1＜＜R2), promptly the ratio of 1 pair second resistance R 2 of first resistance R is little to can ignore the time, and the minimum output voltage Vo of power circuit 1 approximates reference voltage Vref greatly.That is to say that if reference voltage Vref is 1.22V, its minimum output voltage Vo approximately also can be 1.22V, in other words, minimum output voltage Vo is subject to reference voltage Vref, in the use and to some extent restriction.
And if regard power circuit as a Miniature Power Unit supply, above-mentioned output voltage V o can't being adjusted to levels off to the fact of 0V when existing, promptly can be limited in the use, and then cause inconvenience when using.
Therefore, this case inventor is because exposure and its weak point of above-mentioned known technology, and power circuit and its method of adjustment of zero output voltage " can produce level off to " of inventing out, to level off to the output voltage of 0V via the adjustment generation.
Summary of the invention
The fundamental purpose of this case is to provide a kind of the generation to level off to power circuit and its method of adjustment of zero output voltage, the negative feedback mechanism that is constituted by a gain circuitry (G), and then the adjustable scope of output voltage pulled down and can be lower than its reference voltage.
Another purpose of this case is to provide a kind of the generation to level off to power circuit and its method of adjustment of zero output voltage, and it gains with respect to one of a reference voltage by the output voltage of adjusting this power circuit and feeds back to a voltage stabilizer
Adjust end, and then reach this output voltage is adjusted to and level off to zero purpose.The another purpose of this case is for providing a kind of power circuit, and it comprises: a voltage stabilizer, have an input end, an output terminal and an adjustment end, and wherein this input end receives an input voltage, and this output terminal is exported an output voltage; One bleeder circuit is coupled between this output terminal and the ground, utilizes this output voltage to produce a branch pressure voltage; And a gain circuitry, be coupled to this adjustment end and this bleeder circuit, receive this branch pressure voltage that this bleeder circuit produces, to adjust of the gain of this output voltage with respect to a reference voltage.
According to above-mentioned conception, this gain circuitry comprises an operational amplifier, an input resistance and a feedback resistance, this operational amplifier comprises a non-inverting input, a reverse input end and an amplifier out, this input resistance is coupled between this reverse input end and the ground, and this feedback resistance is coupled between this reverse input end and this amplifier out, so by adjusting the ratio size of this feedback resistance, to adjust this gain and to feed back to this adjustment end to this input resistance.
According to above-mentioned conception, this gain circuitry can more comprise at least one operational amplifier, at least one electric crystal, at least one microprocessor controller or at least one analogy multiplier, wherein electric crystal be selected from a two-carrier connect face electric crystal (BJT), a metal oxide semiconductcor field effect electric crystal (MOSFET) and a Junction fet (JFET) wherein it
According to above-mentioned conception, this bleeder circuit comprises one first resistance and one second resistance of series connection in regular turn, this first resistance is coupled to this output terminal, this second resistance is coupled to ground, has a node between this first resistance and this second resistance, and this node is coupled to this gain circuitry, so that this branch pressure voltage is sent to this gain circuitry.
According to above-mentioned conception, when the resistance value of this feedback resistance resistance value much smaller than this input resistance, and the resistance value of this first resistance is during much smaller than the resistance value of this second resistance, and this output voltage equals this reference voltage.
According to above-mentioned conception, and if the resistance value of this second resistance is same as the resistance value of this input resistance, and when this feedback resistance is a variable resistor, can so can being adjusted to, this output voltage level off to zero by adjusting this variable-resistance resistance value to control this output voltage.
According to above-mentioned conception, this voltage stabilizer is a linear voltage voltage stabilizer, and this linear voltage voltage stabilizer is a low pressure difference linear voltage regulator.
According to above-mentioned conception, this voltage stabilizer is a bootstrap voltage voltage stabilizer, and this bootstrap voltage voltage stabilizer is a buck regulators.
The another purpose of this case is for providing a kind of method of adjusting output voltage in a power circuit, and it comprises the following step: import an input voltage in a voltage stabilizer, wherein this voltage stabilizer has an input end, an output terminal and is adjusted end; Determine a reference voltage; And a gain circuitry is provided, and be coupled between this output terminal and this adjustment end, via a gain size that changes this gain circuitry, and feed back to this adjustments end and this reference voltage is compared, to adjust this output voltage.
According to above-mentioned conception, this method more comprises a step: provide a bleeder circuit to be coupled to this output terminal and this gain circuitry, use generation one branch pressure voltage and carry out this change in gain for this gain circuitry.According to above-mentioned conception, this gain circuitry comprises an operational amplifier, an input resistance and a feedback resistance, this operational amplifier comprises a non-inverting input, a reverse input end and an amplifier out, and this input resistance is coupled between this reverse input end and the ground, this feedback resistance is coupled between this reverse input end and this amplifier out, and via adjusting the ratio of this feedback resistance to this input resistance, adjusting the size of this gain, and then adjust this output voltage to leveling off to zero.
The another purpose of this case is for providing a kind of method of adjusting output voltage in a power circuit, and it comprises the following step: import an input voltage in a voltage stabilizer, wherein this voltage stabilizer has an input end, an output terminal and is adjusted end; Determine a reference voltage; And provide an operational amplifier, be coupled between this output terminal and this adjustment end, wherein this operational amplifier comprises a non-inverting input, a reverse input end and an amplifier out, and provide an input resistance to be coupled between this reverse input end and the ground, and one feedback resistance be coupled between this reverse input end and this amplifier out, via adjusting the ratio size of this feedback resistance to this input resistance, to produce a change in gain, and feed back to this adjustment end and compare with this reference voltage, to adjust this output voltage.
According to above-mentioned conception, this method more comprises a step: provide a bleeder circuit to be coupled to this output terminal and this gain circuitry, use generation one branch pressure voltage and carry out this change in gain for this gain circuitry.
According to above-mentioned conception, this output voltage is to be adjusted to level off to zero.
The another purpose of this case is for providing a kind of power circuit, and it comprises: a voltage stabilizer, have an input end, an output terminal and an adjustment end, and wherein this input end receives an input voltage, and this output terminal is exported an output voltage; One first resistance is coupled to this output terminal; One second resistance is coupled between this first resistance and the ground, wherein has a node between this first resistance and this second resistance; An and operational amplifier, be coupled between this adjustment end and this node, wherein this operational amplifier comprises a non-inverting input, a reverse input end and an amplifier out, one input resistance is coupled between this reverse input end and the ground, one feedback resistance is coupled between this reverse input end and this amplifier out, via adjusting the ratio size of this feedback resistance, hold to produce a change in gain and to feed back to this adjustment, and then adjust this output voltage this input resistance.
According to above-mentioned conception, output voltage is to be adjusted to level off to zero.
This technology need not increase many complicated soft hardware equipment, and implementation cost is very cheap.And it is very simple with the know-why of its method of adjustment that the producing of this case levels off to the power circuit of zero output voltage, can be useful in the voltage stabilizer of multiple voltage-dropping type, and high convenience is provided, so can effectively promote the progress of industry.
Effect of this case and purpose can be by following embodiment explanations, so that more deep understanding to be arranged.
Description of drawings
Fig. 1 is the circuit diagram for the known power source circuit.
Fig. 2 is this case preferred embodiment
Kind can produce and to level off to the power circuit of zero output voltage and the summary circuit diagram of its method of adjustment.
Fig. 3 is this case preferred embodiment
Kind can produce and to level off to the power circuit of zero output voltage and the physical circuit configuration diagram of its method of adjustment.
Fig. 4 (A) and (B) be the every relativeness figure that is respectively after power circuit with this case preferred embodiment carries out analogue measurement.
Fig. 5 (A) and (B) be to be respectively the circuit diagram that connects a face electric crystal (BJT) and a metal oxide semiconductcor field effect electric crystal (MOSFET) applicable to the two-carrier in this case gain circuitry.
Embodiment
Will be in the present invention hereinafter be described, being familiar with present technique person must understanding explanation hereinafter only be as illustration usefulness, and is not used in restriction the present invention.
Below level off to power circuit and its method of adjustment of zero output voltage at producing of this case preferred embodiment and be described, but actual framework and the method that is adopted must not meet the framework and the method for description fully, have the knack of this skill person when under the situation that does not break away from practicalness of the present invention and scope, making many variations and modification.
See also Fig. 2, it is to level off to the power circuit of zero output voltage and the summary circuit diagram of its method of adjustment for producing of preferred embodiment of the present invention.One power circuit 2 includes a voltage stabilizer 20, a bleeder circuit 21 and a gain circuitry 23, voltage stabilizer 20 has an input end IN, an output terminal OUT, one and adjusts an end ADJ and an earth terminal GND, wherein input end IN receives an input voltage Vi, output terminal OUT is output one output voltage V o, and earth terminal GND is then in order to ground connection.In addition, bleeder circuit 21 is coupled between output terminal OUT and the ground, it has one first resistance R 1 and one second resistance R 2, first resistance R 1 and second resistance R 2 are to be serially connected with between output terminal OUT and the ground, and has a node 22 between first resistance R 1 and second resistance R 2, utilize output voltage V o to produce a branch pressure voltage, and gain circuitry 23 is to be coupled to adjust between end ADJ and the node 22, in order to receive this branch pressure voltage that bleeder circuit 21 is produced, so gain with respect to one of a reference voltage Vref with control output voltage Vo by gain circuitry 23, and feed back to adjustment end ADJ, that is:
Wherein, G represents this gain, and Vref is the reference voltage of power circuit 2.
Therefore bleeder circuit 21 feeds back to adjustment end ADJ by the gain adjustment of gain circuitry 23 to produce a feedback voltage, when this feedback voltage during less than reference voltage Vref, then increase output voltage V o, and when this feedback voltage during greater than reference voltage Vref, then output voltage V o successively decreases, can reach the purpose of control output voltage Vo thus, and output voltage V o can be pulled down under the reference voltage Vref, and then can make output voltage V o level off to zero.
See also Fig. 3, it is to level off to the power circuit of zero output voltage and the physical circuit configuration diagram of its method of adjustment for producing of this case preferred embodiment.The basic circuit framework of power circuit 3 is identical with the power circuit 2 of Fig. 2, all is to be made of a voltage stabilizer 30, a bleeder circuit 31 and a gain circuitry 33.Different is, the gain circuitry 33 of Fig. 3 is made of an input resistance Ri, a feedback resistance Rf and an operational amplifier OPA, operational amplifier OPA comprises a reverse input end, a non-inverting input and an output terminal, input resistance Ri is coupled between this reverse input end and the ground, feedback resistance Rf is coupled between this reverse input end and this output terminal, and connect with input resistance Ri, this non-inverting input then is coupled to the node 32 of bleeder circuit 31, and this output terminal of operational amplifier OPA then is coupled to the adjustment end ADJ of voltage stabilizer 30.Therefore, this case can be adjusted the gain (G) that gain circuitry 33 is produced by adjusting the ratio size of this feedback resistance Rf to input resistance Ri, and feeds back to adjustment end ADJ with control output voltage Vo.Its concrete formula is deduced as follows:
If Rf=R1, Ri=R2,
Vo=Vref then
Therefore, suppose Rf＜＜during Ri, can ignore the wherein ratio of Rf/Ri, then Zui Da output voltage V o can be decided by the ratio of 1 pair second resistance R 2 of first resistance R in the bleeder circuit 31.Then, decide minimum output voltage Vo by changing the ratio of feedback resistance Rf again to input resistance Ri.And if the resistance value of second resistance R 2 is when being same as the resistance value of input resistance Ri, then as long as the resistance value that changes feedback resistance Rf just can control output voltage Vo, so feedback resistance Rf can be a variable resistor.
Moreover, this case voltage stabilizer (20 applicatory, 30) can be the various voltage stabilizers that are used for step-down, particularly can be a linear voltage voltage stabilizer (Linear Regulator), as a low pressure difference linear voltage regulator (Low Dropout Regulator, LDO), or a bootstrap voltage voltage stabilizer (SwitchingRegulator), as a buck regulators (Step-Down Regulator).
Experimental example:
With power circuit with low pressure difference linear voltage regulator that model is LT1761SD (LDO) is example, and its output voltage (Vo) is to be adjustable type (Adjustable Output Voltage), and its relevant specification is as follows:
Maximum input voltage Vi (max)=20V, maximum output current Io (max)=100mA, minimum voltage difference (Dropout Voltage) (Io=100mA) ≦ 0.5V and reference voltage Vref (typ.)=1.22V.
Therefore, this case can be designed according to this can be from the output voltage V o that adjusts between the 0.05V to 10V, and account form is as follows:
At first, the first step is:
Set?R2＝10K，then?R1＝72K
Then, second step was:
So feedback resistance Rf can select the variable resistor (Potentiometer) of 2Meg for use, can change output voltage V o by the resistance value of adjusting variable resistor Rf, general just like the Miniature Power Unit supply.
And if the circuit of putting into Fig. 3 respectively according to above-mentioned concrete data is to carry out circuit analoging experiment, wherein the detecting position of every measurement data is to be the contact among this Fig. 3 34.Therefore, see also Fig. 4 (A), it is the relativeness figure for variable resistor Rf and output voltage V o, can obviously see increase along with variable resistor Rf, its output voltage V o also descends thereupon, its rate of curve changes and gradually slows down along with the increase of variable resistor Rf, and at last to when variable resistor Rf is increased to 1.87Meg, output voltage V o can be reduced to 50mV (being 0.05V).And compare as if the relativeness with input voltage Vi and output voltage V o, also see also Fig. 4 (B), even it can find out obviously that input voltage Vi is incremented to 20V by 12V, its output voltage V o still can maintain between 46mV or the 47mV, and do not have a too many variation, therefore waits thus and can effectively understand power circuit that this case discloses and its method of adjustment in the graph of a relation and can produce to constitute an easy negative feedback mechanism by the design of gain circuitry really and level off to zero output voltage V o.
Yet, except the operational amplifier OPA that above-mentioned preferred embodiment is carried, the gain circuitry that this case disclosed can be realized with any type of gain circuitry, for example: electric crystal, analogy multiplier or microprocessor controller (MCU) etc. can provide any electronic component of gain feedback, wherein as Fig. 5 (A) with (B), this electric crystal can be that a two-carrier connects a face electric crystal (BJT) (Fig. 5 (A)) or a metal oxide semiconductcor field effect electric crystal (MOSFET) (Fig. 5 (B)), can also be a Junction fet (JFET).As long as this gain circuitry can produce a change in gain and feed back to the adjustment end ADJ of voltage stabilizer, the output voltage V o of voltage stabilizer can be adjusted to and level off to 0V.
In sum, this case provides a kind of the generation to level off to power circuit and its method of adjustment of zero output voltage really, provide between the bleeder circuit and a voltage stabilizer that a gain circuitry is arranged on a power circuit, variation by adjusting gain circuitry resistance ratio size wherein is to produce a change in gain and to feed back to the adjustment end of this voltage stabilizer and existing reference voltage is compared, and then adjust output voltage being lower than reference voltage, and even the output voltage of exportable convergence 0V.This technology need not increase many complicated soft hardware equipment, and implementation cost is very cheap.And, it is very simple that the producing of this case levels off to the know-why of the power circuit of zero output voltage and its method of adjustment, can be useful in the voltage stabilizer of multiple voltage-dropping type, and provide high convenience, therefore can effectively promote the progress of industry, this case technology is simple, can use the field extensive, therefore the value of real tool industry propose application for a patent for invention in accordance with the law.
The above is to utilize preferred embodiment to describe the present invention in detail, but not limit the scope of the invention, therefore the personage who knows this skill should be able to understand, suitably do slightly change and adjustment, will not lose main idea of the present invention place, also do not break away from the spirit and scope of the present invention, the former capital should be considered as further enforcement situation of the present invention.Sincerely asking your juror's explicit example for reference, and pray Hui Zhun, is that institute is to praying.
This case must be thought and is to modify as all by the personage Ren Shi craftsman who has the knack of this technology, right neitherly takes off this case claim Protector that scope is desired.
Claims (14)
1, a kind of power circuit, it comprises:
One voltage stabilizer has an input end, an output terminal and an adjustment end, and wherein this input end receives an input voltage, and this output terminal is exported an output voltage;
One bleeder circuit is coupled between this output terminal and the ground, utilizes this output voltage to produce a branch pressure voltage; And
One gain circuitry is coupled to this adjustment end and this bleeder circuit, receives this branch pressure voltage that this bleeder circuit produces, to adjust the gain of this output voltage with respect to a reference voltage.
2, power circuit as claimed in claim 1, wherein this gain circuitry comprises an operational amplifier, an input resistance and a feedback resistance, this operational amplifier comprises a non-inverting input, a reverse input end and an amplifier out, this input resistance is to be coupled between this reverse input end and the ground, and this feedback resistance is to be coupled between this reverse input end and this amplifier out, and via adjusting the ratio size of this feedback resistance, to adjust this gain and to feed back to this adjustment end to this input resistance.
3, power circuit as claimed in claim 1, wherein this gain circuitry more comprises at least one electric crystal, this electric crystal be selected from a two-carrier connect face electric crystal, a metal oxide semiconductcor field effect electric crystal and a Junction fet one of them.
4, power circuit as claimed in claim 1, wherein this gain circuitry more comprises at least one microprocessor controller or at least one analogy multiplier.
5, power circuit as claimed in claim 2, wherein this bleeder circuit is one first resistance and one second resistance that comprises series connection in regular turn, this first resistance is to be coupled to this output terminal, this second resistance is to be coupled to ground, has a node between this first resistance and this second resistance, and this node is coupled to this gain circuitry, so that this branch pressure voltage is sent to this gain circuitry.
6, power circuit as claimed in claim 5, wherein when resistance value much smaller than the resistance value of the resistance value of this input resistance and this first resistance much smaller than this second resistance of the resistance value of this feedback resistance, this output voltage is to equal this reference voltage.
7, power circuit as claimed in claim 6, wherein when the resistance value of this second resistance is same as the resistance value of this input resistance, this feedback resistance is a variable resistor, and by adjusting this variable-resistance resistance value to adjust this output voltage, this output voltage is to be adjusted to level off to zero.
8, power circuit as claimed in claim 1, wherein this voltage stabilizer is a linear voltage voltage stabilizer, and this linear voltage voltage stabilizer is a low pressure difference linear voltage regulator.
9, power circuit as claimed in claim 1, wherein this voltage stabilizer is a bootstrap voltage voltage stabilizer, and this bootstrap voltage voltage stabilizer is a buck regulators.
10, a kind of method of in a power circuit, adjusting output voltage, it comprises the following step:
Import an input voltage in a voltage stabilizer, wherein this voltage stabilizer has an input end, an output terminal and is adjusted end;
Determine a reference voltage; And
One gain circuitry is provided, is coupled between this output terminal and this adjustment end, via a gain size that changes this gain circuitry, and feed back to this adjustments end and this reference voltage is compared, to adjust this output voltage.
11, method as claimed in claim 10 more comprises a step: provide a bleeder circuit to be coupled to this output terminal and this gain circuitry, use producing a branch pressure voltage carries out this gain for this gain circuitry variation.
12, method as claimed in claim 10, wherein this gain circuitry comprises an operational amplifier, an input resistance and a feedback resistance, this operational amplifier comprises a non-inverting input, a reverse input end and an amplifier out, and this input resistance is to be coupled between this reverse input end and the ground, this feedback resistance is to be coupled between this reverse input end and this amplifier out, and via adjusting the ratio of this feedback resistance to this input resistance, to adjust the size of this gain, make that this output voltage is to be adjusted to level off to zero.
13, a kind of method of in a power circuit, adjusting output voltage, it comprises the following step:
Import an input voltage in a voltage stabilizer, wherein this voltage stabilizer has an input end, an output terminal and is adjusted end;
Determine a reference voltage; And
One operational amplifier is provided, be coupled between this output terminal and this adjustment end, wherein this operational amplifier comprises a non-inverting input, a reverse input end and an amplifier out, and it is to be coupled between this reverse input end and the ground and a feedback resistance is to be coupled between this reverse input end and this amplifier out that an input resistance is provided, via adjusting the ratio size of this feedback resistance to this input resistance, to produce a change in gain, and feed back to this adjustment end and compare with this reference voltage, to adjust this output voltage.
14, a kind of power circuit, it comprises:
One voltage stabilizer has an input end, an output terminal and an adjustment end, and wherein this input end receives an input voltage, and this output terminal is exported an output voltage;
One first resistance is coupled to this output terminal;
One second resistance is coupled between this first resistance and the ground, wherein has a node between this first resistance and this second resistance; And
One operational amplifier, be coupled between this adjustment end and this node, wherein this operational amplifier comprises a non-inverting input, a reverse input end and an amplifier out, one input resistance is to be coupled between this reverse input end and the ground, one feedback resistance is to be coupled between this reverse input end and this amplifier out, via adjusting the ratio size of this feedback resistance, hold to produce a change in gain and to feed back to this adjustment, and then adjust this output voltage this input resistance.
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| CNA2007101664387A CN101430570A (en) | 2007-11-07 | 2007-11-07 | Power supply circuit capable of generating output voltage close to zero and its regulation method |
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| CNA2007101664387A CN101430570A (en) | 2007-11-07 | 2007-11-07 | Power supply circuit capable of generating output voltage close to zero and its regulation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403892A (en) * | 2010-09-14 | 2012-04-04 | 鸿富锦精密工业（深圳）有限公司 | Power switching circuit and network camera using same |
| CN103869864A (en) * | 2014-03-26 | 2014-06-18 | 中国科学院光电技术研究所 | High-voltage square wave driving signal bottom level stabilizing device |
| CN107689647A (en) * | 2016-08-05 | 2018-02-13 | 纬创资通股份有限公司 | Charging circuit and electronic device |
| CN111271309A (en) * | 2018-12-04 | 2020-06-12 | 合勤科技股份有限公司 | Linear control circuit and method thereof |
| CN114019405A (en) * | 2021-07-15 | 2022-02-08 | 重庆康佳光电技术研究院有限公司 | Lighting test device, method and system |
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2007
- 2007-11-07 CN CNA2007101664387A patent/CN101430570A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403892A (en) * | 2010-09-14 | 2012-04-04 | 鸿富锦精密工业（深圳）有限公司 | Power switching circuit and network camera using same |
| CN103869864A (en) * | 2014-03-26 | 2014-06-18 | 中国科学院光电技术研究所 | High-voltage square wave driving signal bottom level stabilizing device |
| CN107689647A (en) * | 2016-08-05 | 2018-02-13 | 纬创资通股份有限公司 | Charging circuit and electronic device |
| CN107689647B (en) * | 2016-08-05 | 2022-01-28 | 纬创资通股份有限公司 | Charging circuit and electronic device |
| CN111271309A (en) * | 2018-12-04 | 2020-06-12 | 合勤科技股份有限公司 | Linear control circuit and method thereof |
| CN111271309B (en) * | 2018-12-04 | 2022-04-05 | 合勤科技股份有限公司 | Linear control circuit and method thereof |
| US11293810B2 (en) | 2018-12-04 | 2022-04-05 | Zyxel Communications Corp. | Linear control circuit and method thereof |
| CN114019405A (en) * | 2021-07-15 | 2022-02-08 | 重庆康佳光电技术研究院有限公司 | Lighting test device, method and system |
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