CN103731049B - Current zero-crossing point detects circuit and method, drive circuit and method, Switching Power Supply - Google Patents
Current zero-crossing point detects circuit and method, drive circuit and method, Switching Power Supply Download PDFInfo
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Abstract
The invention provides a kind of current zero-crossing point detection circuit, Switching Power Supply is applied to, Switching Power Supply includes：Rectifier bridge, the first power switch pipe, the second power switch pipe and ON-OFF control circuit.Current zero-crossing point detection circuit is serially connected between the source electrode of the first power switch pipe and the input of ON-OFF control circuit, descending slope for detecting the source voltage of the first power switch pipe, and descending slope is converted into first voltage is compared with predeterminated voltage, level diode current crossover point signal of output controls being switched on or off for the second power switch pipe to ON-OFF control circuit.It can be seen that, the current zero-crossing point detection circuit that the present invention is provided can realize detecting the current zero-crossing point information of secondary diode, and single transformer assists winding need not be used again, and its circuit takes small volume, low cost.
Description
Technical field
The present invention relates to LED field, in particular, be related to a kind of current zero-crossing point detection circuit and
Method, drive circuit and method, Switching Power Supply.
Background technology
Fig. 1 is the rough schematic view of traditional inverse-excitation type LED drive circuit, as shown in figure 1, alternating current is whole by rectifier bridge
Filtered through capacitor C1 after stream, produce a DC voltage, then make control through resistance R1 and capacitor C2 one low-voltage DCs of generation
Chip starts, that is, control power switch pipe M1 to open.And the transformer of the drive circuit has three windings, wherein, primary side winding
It is connected between the drain electrode of the output end of rectifier bridge and power switch pipe M1, the Same Name of Ends of vice-side winding is with secondary diode D1's
Anode is connected, and assists winding is connected between diode D2 and ground.
From the figure not difficult to find, traditional inverse-excitation type LED drive circuit is by assists winding for control chip is powered, together
When assists winding be additionally operable to detect secondary diode D1 the overvoltage of current zero-crossing point and output voltage information.
But, above-mentioned assists winding can increase the volume and cost of drive circuit, be not suitable for existing market LED small sizes, low
The development trend of cost.Therefore, how can realize detecting the current zero-crossing point information of secondary diode, drive circuit can be made again
It is current problem demanding prompt solution to take small volume.
The content of the invention
In view of this, the invention provides a kind of current zero-crossing point detection circuit, can realize detecting secondary diode
Current zero-crossing point information, need not use single transformer assists winding again, and its circuit takes small volume.
To achieve the above object, the present invention provides following technical scheme：
A kind of current zero-crossing point detects circuit, is applied to Switching Power Supply, and the Switching Power Supply includes：Rectifier bridge, the first work(
Rate switching tube, the second power switch pipe and ON-OFF control circuit,
The current zero-crossing point detection circuit is serially connected in the source electrode and the switch control electricity of first power switch pipe
Between the input on road, the descending slope of the source voltage for detecting first power switch pipe, and by the lower drop angle
Rate is converted into first voltage and is compared with predeterminated voltage, level diode current crossover point signal of output to the switch control
Circuit processed, controls being switched on or off for second power switch pipe.
Preferably, including：First electric capacity, current detection circuit, electric current turn potential circuit and comparator；
The first end of first electric capacity is connected with the source electrode of first power switch pipe, in first power switch
When the source voltage of pipe declines, the first electric capacity electric discharge produces the first electric current；
The input of the current detection circuit is connected with the second end of first electric capacity, detects first electric current；
The input that the electric current turns potential circuit is connected with the output end of the current detection circuit, by the described first electricity
Circulation turns to the first voltage；
The homophase input of the comparator terminates the predeterminated voltage, the inverting input of the comparator and the electric current
The output end for turning potential circuit is connected, and the size for comparing the first voltage and the predeterminated voltage produces the secondary
Diode current crossover point signal.
Preferably, the current detection circuit includes：First metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the second electric capacity；
The source electrode of first metal-oxide-semiconductor connects external voltage, and the grid of first metal-oxide-semiconductor is used as the current detection circuit
Output end, first metal-oxide-semiconductor drain electrode respectively with the first end and the grid of first metal-oxide-semiconductor of second electric capacity
It is connected, the second end of second electric capacity is connected with the source electrode of second metal-oxide-semiconductor, and the drain electrode of second metal-oxide-semiconductor is used as institute
The input of current detection circuit is stated, the grid of second metal-oxide-semiconductor connects bias voltage.
Preferably, the electric current turns potential circuit includes：Second metal-oxide-semiconductor, the 3rd electric capacity and first resistor；
The source electrode of second metal-oxide-semiconductor connects external voltage, and the grid of second metal-oxide-semiconductor turns voltage electricity as the electric current
The input on road, the drain electrode of second metal-oxide-semiconductor is respectively with the of the first end of the 3rd electric capacity and the first resistor
One end is connected, and turns the output end of potential circuit as the electric current, the second end of the 3rd electric capacity and first electricity
Second end of resistance is grounded.
Preferably, the reference voltage that voltage source is produced on the basis of the predeterminated voltage.
A kind of current over-zero point detecting method, is applied to above-mentioned current zero-crossing point detection circuit, the current zero-crossing point
Detection method includes：
Detect the descending slope of the source voltage of first power switch pipe；
The descending slope is converted into first voltage；
Compare the size of the first voltage and predeterminated voltage, export secondary diode current zero-crossing point signal.
Preferably, the descending slope of the source voltage of detection first power switch pipe includes：
Detect that the first electric capacity is produced in the drive circuit when the source voltage of first power switch pipe declines
The slope of the first electric current.
A kind of drive circuit, including：Rectifier bridge, the first power switch pipe, the second power switch pipe, ON-OFF control circuit with
And the current zero-crossing point detection circuit described in any one described above；
First power switch pipe and second power switch pipe that the output end of the rectifier bridge passes through concatenation
Ground connection；
The current zero-crossing point detection circuit is serially connected in source electrode and the switch control electricity of first power switch pipe
Between the input on road；
The output end of the ON-OFF control circuit is connected with the grid of second power switch pipe, the switch control electricity
The control end on road is connected with the source electrode of second power switch pipe.
A kind of driving method, is applied to above-mentioned drive circuit, and the driving method includes：
Detect the descending slope of the source voltage of first power switch pipe；
The descending slope is converted into first voltage；
Compare the size of the first voltage and predeterminated voltage, export secondary diode current zero-crossing point signal；
Being switched on or off for second power switch pipe is controlled according to the secondary diode current zero-crossing point signal.
A kind of Switching Power Supply, including the current zero-crossing point detection circuit described in any one.
That is, the invention provides a kind of current zero-crossing point detection circuit, Switching Power Supply is applied to, the Switching Power Supply includes：
Rectifier bridge, the first power switch pipe, the second power switch pipe and ON-OFF control circuit.Current zero-crossing point detection circuit concatenation
Between the source electrode of the first power switch pipe and the input of ON-OFF control circuit, the source electrode for detecting the first power switch pipe
The descending slope of voltage, and descending slope is converted into first voltage is compared with predeterminated voltage, export a secondary diode
Current zero-crossing point signal controls being switched on or off for the second power switch pipe to ON-OFF control circuit.It can be seen that, what the present invention was provided
Current zero-crossing point detects circuit, can realize detecting the current zero-crossing point information of secondary diode, again need not be using single
Transformer assists winding, its circuit takes small volume, low cost.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the circuit theory diagrams of LED drive power in the prior art；
Fig. 2 is a kind of structural representation of drive circuit that a kind of current zero-crossing point detection circuit provided by the present invention is constituted
Figure；
The structural representation of the current detection circuit in a kind of current zero-crossing point detection circuit that Fig. 3 is provided for the present invention；
Electric current in a kind of current zero-crossing point detection circuit that Fig. 4 is provided for the present invention turns the structural representation of potential circuit
Figure；
After Fig. 5 detects circuit for a kind of current zero-crossing point provided using the present invention, the waveform diagram of each signal.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
The invention provides a kind of current zero-crossing point detection circuit, can realize detecting the current zero-crossing point of secondary diode
Information, need not use single transformer assists winding again, and its circuit takes small volume.
Embodiment one
Fig. 2 is referred to, for a kind of current zero-crossing point that the present invention is provided detects that the structure of the drive circuit that circuit is constituted is shown
It is intended to, current zero-crossing point detection circuit is applied to Switching Power Supply.Wherein, Switching Power Supply includes：Rectifier bridge DB1, the first power
Switching tube M1, the second power switch pipe M2 and ON-OFF control circuit 104.
The source electrode that this current zero-crossing point detection circuit is serially connected in the first power switch pipe M1 is defeated with ON-OFF control circuit 104
Enter between end, for the descending slope of the source voltage of the first power switch pipe of detection, and descending slope is converted into the first electricity
Pressure is compared with predeterminated voltage, level diode current crossover point signal of output to ON-OFF control circuit, controls the second work(
Rate switching tube is switched on or off.
From Fig. 2 it is seen that, the present invention provide current zero-crossing point detection circuit, it is not necessary to using single transformer it is auxiliary
Winding is helped, its circuit takes small volume, low cost.
Specifically, a kind of circuit that implements of current zero-crossing point detection circuit is present embodiments provided, including：First electricity
Hold C4, current detection circuit 101, electric current and turn potential circuit 102 and comparator 103.
Its circuit connecting relation is：
The first end of the first electric capacity is connected with the source electrode of the first power switch pipe, in the source voltage of the first power switch pipe
During decline, the electric discharge of the first electric capacity produces the first electric current.The input of current detection circuit is connected with the second end of the first electric capacity,
Detect the first electric current.Electric current turns the input of potential circuit and is connected with the output end of current detection circuit, by the conversion of the first electric current
It is first voltage.The homophase input termination predeterminated voltage of comparator, inverting input and the electric current of comparator turn potential circuit
Output end is connected, the size for comparing first voltage and predeterminated voltage, produces secondary diode current zero-crossing point signal.
Need exist for explanation, what current detection circuit 101 and electric current turned potential circuit 102 realizes that circuit has a lot
Kind, in the present embodiment, do not enumerate one by one.Those skilled in the art it is of the invention inwardly, to current detection circuit with
And electric current turns the selection of the different structure of potential circuit and belongs within protection scope of the present invention.
Preferably, a kind of specific current detection circuit is present embodiments provided, as shown in figure 3, including：First metal-oxide-semiconductor
P1, the 3rd metal-oxide-semiconductor P3 and the second electric capacity CC1.
The annexation of each device is：
The source electrode of the first metal-oxide-semiconductor connects external voltage, the grid of the first metal-oxide-semiconductor as current detection circuit output end,
The drain electrode of one metal-oxide-semiconductor is connected with the first end of the second electric capacity and the grid of the first metal-oxide-semiconductor respectively, the second end of the second electric capacity with
The source electrode of the second metal-oxide-semiconductor is connected, the drain electrode of the second metal-oxide-semiconductor as current detection circuit input, the grid of the second metal-oxide-semiconductor connects
Bias voltage.
Its current detecting principle is：When input Iin has electric current to flow outwardly, the electric current can be by the first metal-oxide-semiconductor
P1 is detected, that is, realize the effect of current detecting.It should be noted that wherein, Vb is the built-in bias voltage of drive circuit.
Likewise, the present embodiment also provides a kind of specific electric current turns potential circuit, as shown in figure 4, including：Second
Metal-oxide-semiconductor P2, the 3rd electric capacity CC2 and first resistor RR1.
The electric current turns in potential circuit, and the annexation of each device is as follows：
The source electrode of the second metal-oxide-semiconductor connects external voltage, and the grid of the second metal-oxide-semiconductor turns the input of potential circuit as electric current,
The drain electrode of the second metal-oxide-semiconductor is connected with the first end of the 3rd electric capacity and the first end of first resistor respectively, and turns electricity as electric current
The output end of volt circuit, the second end of the 3rd electric capacity and the second end of first resistor are grounded.
The operation principle that its electric current turns voltage is：The electric current detected by the first metal-oxide-semiconductor is flowed into by the second metal-oxide-semiconductor P2
3rd electric capacity CC2 and first resistor RR1, by after the filtering process of the 3rd electric capacity CC2 and first resistor RR1, being converted into
One voltage Vo.
First voltage Vo is compared with predeterminated voltage Vref afterwards, comparator 103 produces secondary diode electricity
Flow through zero signal to ON-OFF control circuit 104.
It should be noted that the predeterminated voltage Vref in above-mentioned current zero-crossing point detection circuit can be for inside drive circuit
The reference voltage source reference voltage for producing, or the reference voltage produced by external voltage source, in this implementation
Generation process in example not to predeterminated voltage is defined.
It can be seen that, the current zero-crossing point detection circuit that the present invention is provided can realize detecting the current over-zero of secondary diode
Point information, need not use single transformer assists winding again, and its circuit takes small volume, low cost.
Embodiment two
On the basis of above-described embodiment one, the present embodiment additionally provides a kind of drive circuit, including：Rectifier bridge, first
Power switch pipe, the second power switch pipe, ON-OFF control circuit and above-mentioned current zero-crossing point detection circuit.
Wherein, the output end of rectifier bridge is grounded by the first power switch pipe for concatenating and the second power switch pipe.Electricity
Zero-detection circuit is flowed through to be serially connected between the source electrode of the first power switch pipe and the input of ON-OFF control circuit.Switch control
The output end of circuit is connected with the grid of the second power switch pipe, the control end of ON-OFF control circuit and the second power switch pipe
Source electrode is connected.
Explanation is needed exist for, the circuit structure and operation principle of the current zero-crossing point detection circuit in the present embodiment
It is identical with embodiment one.Specifically, incorporated by reference to Fig. 2 and Fig. 5, the operation principle to this drive circuit is introduced, as follows：
When the second power switch pipe M2 is turned on, the first power switch pipe M1 is also switched on, now the primary current of transformer
Rise, the voltage on sampling resistor R2 also rises, when the voltage on sampling resistor R2 reaches pre-set threshold value, ON-OFF control circuit
104 output control signals, close the second power switch pipe M2, while the first power switch pipe M1 also disconnects.Now, feedback stream two
Pole pipe D5 is turned on, and the source voltage of the first power switch pipe M1 is clamped to Vcc, while the secondary diode of transformer secondary
D1 begins to turn on, and the electric current Isecond on secondary diode D1 quickly rises to peak value and begins to decline, the t1-t2 in such as Fig. 5
Moment.
When the electric current of secondary diode D1 drops to zero, the t2 moment in such as Fig. 5, the drain electrode of the first power switch pipe M1
Voltage begins to decline, due to the drain electrode and the Capacitance Coupled effect of source electrode of the first power switch pipe M1, then the first power switch pipe
The source voltage of M1 also begins to decline, i.e., the Out terminal voltages in corresponding diagram 5 decline.
It should be noted that the Capacitance Coupled of first power switch pipe M1, can be in the first power switch pipe M1
Between source electrode and drain electrode and connect an external capacitor and coupled, or the source electrode by the first power switch pipe M1 and drain electrode
Between parasitic capacitance coupled.
When Out points voltage declines, the electric current for having the source electrode for flowing into the first power switch pipe M1 from the first electric capacity C4 is produced
It is raw, i.e. the first electric current.First electric current can be gathered by current detection circuit 101, and by electric current turn potential circuit 102 by this first
Electric current is converted into first voltage Vo, and now, be compared for first voltage Vo and predeterminated voltage Vref by comparator 103, output
One control signal is to ON-OFF control circuit 104.
With reference to Fig. 5, in the present embodiment, when secondary diode ON time Tons terminates, i.e. secondary diode
Current over-zero moment, the first voltage Vo that electric current turns the output of potential circuit 104 steeply rises and more than predeterminated voltage Vref, this
When, comparator 103 is overturn, therefore, it is secondary diode current zero-crossing point signal to define above-mentioned control signal.
To sum up, the drive circuit that the present embodiment is provided also can both realize detecting the current zero-crossing point information of secondary diode,
Single transformer assists winding need not be used again, and circuit takes small volume, low cost.
Embodiment three
Above we talk of a kind of current zero-crossing point detection circuit, in conjunction with foregoing circuit, the present embodiment is additionally provided
A kind of current zero-crossing point electric current detecting method, the method includes：
S101：Detect the descending slope of the source voltage of the first power switch pipe；
S102：Descending slope is converted into first voltage；
S103：Compare the size of first voltage and predeterminated voltage, export secondary diode current zero-crossing point signal.
Except this, also on the basis of above-mentioned drive circuit, there is provided a kind of driving method, the method includes：
S101：Detect the descending slope of the source voltage of the first power switch pipe；
S102：Descending slope is converted into first voltage；
S103：Compare the size of first voltage and predeterminated voltage, export secondary diode current zero-crossing point signal；
S104：Being switched on or off for second power switch pipe is controlled according to secondary diode current zero-crossing point signal.
Can intuitively see very much from above-mentioned, the driving method that the present embodiment is provided is in above-mentioned current zero-crossing point detection side
On the basis of method, step S104 is increased.Wherein, step S101 can be：Detect the source voltage in the first power switch pipe
During decline, the slope of the first electric current that the first electric capacity is produced in drive circuit.
The operation principle of the current over-zero point detecting method and driving method refers to embodiment two, does not do herein in detail
State.It should be noted that predeterminated voltage in the present embodiment can voltage source is produced on the basis of a reference voltage.
Except this, the present embodiment additionally provides a kind of Switching Power Supply, including the above-mentioned current zero-crossing point detection electricity of any one
Road.
To sum up, the invention provides a kind of current zero-crossing point detection circuit, Switching Power Supply is applied to, Switching Power Supply includes：
Rectifier bridge, the first power switch pipe, the second power switch pipe and ON-OFF control circuit.Current zero-crossing point detection circuit concatenation
Between the source electrode of the first power switch pipe and the input of ON-OFF control circuit, the source electrode for detecting the first power switch pipe
The descending slope of voltage, and descending slope is converted into first voltage is compared with predeterminated voltage, export a secondary diode
Current zero-crossing point signal controls being switched on or off for the second power switch pipe to ON-OFF control circuit.It can be seen that, what the present invention was provided
Current zero-crossing point detects circuit, can realize detecting the current zero-crossing point information of secondary diode, again need not be using single
Transformer assists winding, its circuit takes small volume, low cost.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For the device that embodiment is provided
For, because it is corresponding with the method that embodiment is provided, so description is fairly simple, related part is said referring to method part
It is bright.
The described above of the embodiment to being provided, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principle provided in this article and features of novelty phase one
The scope most wide for causing.
Claims (10)
1. a kind of current zero-crossing point detection circuit, is applied to Switching Power Supply, and the Switching Power Supply includes：Rectifier bridge, the first power
Switching tube, the second power switch pipe and ON-OFF control circuit, it is characterised in that：
The current zero-crossing point detection circuit is serially connected in the source electrode and the ON-OFF control circuit of first power switch pipe
Between input, the descending slope of the source voltage for detecting first power switch pipe, and the descending slope is turned
Turn to first voltage to be compared with predeterminated voltage, level diode current crossover point signal of output to the switch control electricity
Road, controls being switched on or off for second power switch pipe.
2. current zero-crossing point according to claim 1 detects circuit, it is characterised in that including：First electric capacity, current detecting
Circuit, electric current turn potential circuit and comparator；
The first end of first electric capacity is connected with the source electrode of first power switch pipe, in first power switch pipe
When source voltage declines, the first electric capacity electric discharge produces the first electric current；
The input of the current detection circuit is connected with the second end of first electric capacity, detects first electric current；
The input that the electric current turns potential circuit is connected with the output end of the current detection circuit, and first electric current is turned
Turn to the first voltage；
The homophase input of the comparator terminates the predeterminated voltage, and the inverting input of the comparator turns electricity with the electric current
The output end of volt circuit is connected, the size for comparing the first voltage and the predeterminated voltage, produces secondary two pole
Tube current crossover point signal.
3. current zero-crossing point according to claim 2 detects circuit, it is characterised in that the current detection circuit includes：
First metal-oxide-semiconductor, the second metal-oxide-semiconductor and the second electric capacity；
The source electrode of first metal-oxide-semiconductor connects external voltage, and the grid of first metal-oxide-semiconductor is used as the defeated of the current detection circuit
Go out end, first metal-oxide-semiconductor drain electrode respectively with the first end and the grid phase of first metal-oxide-semiconductor of second electric capacity
Even, the second end of second electric capacity is connected with the source electrode of second metal-oxide-semiconductor, and the drain electrode of second metal-oxide-semiconductor is used as described
The input of current detection circuit, the grid of second metal-oxide-semiconductor connects bias voltage.
4. current zero-crossing point according to claim 2 detects circuit, it is characterised in that the electric current turns potential circuit bag
Include：3rd metal-oxide-semiconductor, the 3rd electric capacity and first resistor；
The source electrode of the 3rd metal-oxide-semiconductor connects external voltage, and the grid of the 3rd metal-oxide-semiconductor turns potential circuit as the electric current
Input, the 3rd metal-oxide-semiconductor drain electrode respectively with the first end and the first end of the first resistor of the 3rd electric capacity
It is connected, and turns the output end of potential circuit as the electric current, the second end of the 3rd electric capacity and the first resistor
Second end is grounded.
5. current zero-crossing point according to claim 1 detects circuit, it is characterised in that voltage on the basis of the predeterminated voltage
The reference voltage that source produces.
6. a kind of current over-zero point detecting method, it is characterised in that be applied to the electric current as described in claim 2-4 any one
Zero-crossing detection circuit, the current over-zero point detecting method includes：
Detect the descending slope of the source voltage of first power switch pipe；
The descending slope is converted into first voltage；
Compare the size of the first voltage and predeterminated voltage, export secondary diode current zero-crossing point signal.
7. current over-zero point detecting method according to claim 6, it is characterised in that detection first power is opened
The descending slope for closing the source voltage of pipe includes：
Detect when the source voltage of first power switch pipe declines, the first electric capacity in the current zero-crossing point detection circuit
The slope of the first electric current for producing.
8. a kind of drive circuit, it is characterised in that including：Rectifier bridge, the first power switch pipe, the second power switch pipe, switch
Current zero-crossing point detection circuit as described in control circuit and any one as described in claim 1-5；
The output end of the rectifier bridge is grounded by first power switch pipe for concatenating and second power switch pipe；
Current zero-crossing point detection circuit is serially connected in the source electrode and the ON-OFF control circuit of first power switch pipe
Between input；
The output end of the ON-OFF control circuit is connected with the grid of second power switch pipe, the ON-OFF control circuit
Control end is connected with the source electrode of second power switch pipe.
9. a kind of driving method, it is characterised in that be applied to drive circuit as claimed in claim 8, the driving method bag
Include：
Detect the descending slope of the source voltage of first power switch pipe；
The descending slope is converted into first voltage；
Compare the size of the first voltage and predeterminated voltage, export secondary diode current zero-crossing point signal；
Being switched on or off for second power switch pipe is controlled according to the secondary diode current zero-crossing point signal.
10. a kind of Switching Power Supply, it is characterised in that including the current zero-crossing point inspection as described in any one in claim 1-5
Slowdown monitoring circuit.
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| CN201310687400.XA CN103731049B (en) | 2013-12-13 | 2013-12-13 | Current zero-crossing point detects circuit and method, drive circuit and method, Switching Power Supply |
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| CN201310687400.XA CN103731049B (en) | 2013-12-13 | 2013-12-13 | Current zero-crossing point detects circuit and method, drive circuit and method, Switching Power Supply |
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| CN107271756B (en) * | 2014-12-04 | 2019-12-17 | 杰华特微电子（杭州）有限公司 | Load voltage detection circuit and method |
| CN105337480A (en) * | 2015-10-22 | 2016-02-17 | 南宁市桂芯微电子科技有限公司 | Grid driving circuit with switching tubes connected in parallel |
| CN110247636B (en) * | 2018-03-08 | 2024-02-06 | 海能达通信股份有限公司 | Radio frequency power amplifier circuit, output power switch control circuit and control method thereof |
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Effective date of registration: 20210128 Address after: No. 1600, Zixing Road, Minhang District, Shanghai 200241 Patentee after: BCD (SHANGHAI) MICRO-ELECTRONICS Ltd. Address before: 800 Yishan Road, Xuhui District, Shanghai Patentee before: BCD Semiconductor Manufacturing Ltd. |