CN204598407U - There is the switching circuit of emergency starting function power device - Google Patents
There is the switching circuit of emergency starting function power device Download PDFInfo
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- CN204598407U CN204598407U CN201520295900.3U CN201520295900U CN204598407U CN 204598407 U CN204598407 U CN 204598407U CN 201520295900 U CN201520295900 U CN 201520295900U CN 204598407 U CN204598407 U CN 204598407U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
Structure is simple, cost is low and when normal lighting and emergency lighting share equal illumination device, whether energy is according to being connected on external power grid or being connected to the switching circuit with emergency starting power device of automatically connecting or closing this lighting device with or without three kinds of states on the external power grid of power supply.Comprise input " 1 " starting switch between pin and external power grid being connected to this circuit, be provided with in load circuit loop with starting switch unlatching or close automatic switching on or disconnect the ON-OFF control circuit that is connected with this load circuit of charging device.The utility model can identify that this circuit and external power grid thoroughly disconnect automatically, be connected to without three kinds of states on the external power grid on external power grid when power and when being connected to power supply by described starting switch by described starting switch, and according to the connection of the demand automatic switching on preset or disconnection charging device and load circuit.Its structure is simple, stable performance, safe and reliable, whole circuit element used is few, and cost of investment is low.
Description
Technical field
The utility model relates to a kind of switching circuit, particularly a kind of switching circuit for lighting device.
Background technology
With the power device (as emergency lighting device, family expenses small electric apparatus etc.) of emergency starting function in prior art, there are following two classes (for lighting device):
One, common emergency lighting device used in everyday determines whether open or close emergency lighting after having no-voltage to input by detection, namely during no-voltage input, just automatically opens emergency lighting device.
Its two, common emergency lighting device used in everyday, when having a power failure suddenly, need connect charging device wherein by opening special emergency button, is this power illuminating device then by this charging device.
Said structure exists following not enough:
1) for first kind situation, deenergization and power failure all can open emergency lighting device automatically, do not possess daily home lighting function.
2) for Equations of The Second Kind situation, hand switch uses inconvenience.
Utility model content
Whether the technical problems to be solved in the utility model is to provide that a kind of structure is simple, cost is low and when normal lighting and emergency lighting share equal illumination device, can according to being connected on external power grid or being connected to the switching circuit with emergency starting power device of automatically connecting or closing this lighting device with or without three kinds of states on the external power grid of power supply.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:
The switching circuit with emergency starting function power device of the present utility model, to comprise between input " 1 " starting switch between pin with external power grid being connected to this circuit, input " 2 " pin being connected described input " 1 " pin and this circuit and the reduction voltage circuit charged for charging device and the load circuit that electric energy is provided by this charging device, be also provided with in described load circuit loop with described starting switch unlatching or close automatic switching on or disconnect the ON-OFF control circuit that described charging device is connected with this load circuit; Current-limiting resistance is provided with between described charging device feeder ear and described input " 1 " pin.
Described ON-OFF control circuit comprises the first transistor, the first metal-oxide-semiconductor, the second resistance, the 3rd resistance, the 4th resistance and the first electric capacity; Wherein, the collector electrode of described the first transistor is connected to the grid of the first metal-oxide-semiconductor, its grounded emitter, base stage is connected to described input " 1 " pin or input " 2 " pin by the second resistance, and described 3rd resistance and the first electric capacity are connected between the base stage of the first transistor and emitter; The source electrode of the first metal-oxide-semiconductor is connected to the feeder ear of described charging device, its drain electrode is connected to load circuit by the 11 resistance, 4th resistance is between the grid and source electrode of the first metal-oxide-semiconductor, or, the source ground of the first metal-oxide-semiconductor, its drain electrode is connected to the feeder ear of described charging device by load circuit, the 11 resistance, the 4th resistance is between the grid and the feeder ear of charging device of the first metal-oxide-semiconductor.
Described ON-OFF control circuit comprises the first metal-oxide-semiconductor, the second resistance, the 3rd resistance and the first electric capacity; Wherein, the grid of the first metal-oxide-semiconductor is connected to described input " 2 " pin by the second resistance, its source ground, its drain electrode is connected to the feeder ear of described charging device by load circuit, the 11 resistance, described 3rd resistance and the first electric capacity are connected between its grid and source electrode.
Described ON-OFF control circuit comprises the first transistor, the first metal-oxide-semiconductor, the second resistance, the 3rd resistance, the 4th resistance and the first electric capacity; Wherein, the collector electrode of described the first transistor is connected to the grid of the first metal-oxide-semiconductor, its emitter is connected to the feeder ear of charging device, and base stage is connected to described input " 1 " pin by the second resistance, and described 3rd resistance and the first electric capacity are connected between the base stage of the first transistor and emitter; The source ground of the first metal-oxide-semiconductor, its drain electrode is connected to the feeder ear of described charging device by load circuit, the 11 resistance, the 4th resistance is between the grid and source electrode of the first metal-oxide-semiconductor.
Described ON-OFF control circuit comprises the first amplifier pipe, the second resistance, the 3rd resistance, the 6th resistance, the 7th resistance and the first electric capacity; Wherein, the forward input pin of the first amplifier pipe is connected to described input " 2 " pin by the second resistance, reverse input pin leads up to the 7th grounding through resistance, and the 6th resistance of separately leading up to is connected to the feeder ear of described charging device, and its output pin is by the 11 resistance, load circuit ground connection; Described 3rd resistance and the first electric capacity are connected between its forward input pin and ground.
Battery over-discharge protection circuit and over-charging of battery protective circuit is set up between described reduction voltage circuit and charging device feeder ear.
Another road reduction voltage circuit and load circuit is also parallel with between described input " 1 " pin and input " 2 " pin.
Described reduction voltage circuit can be full-wave rectifying circuit, half-wave rectifying circuit, Switching Power Supply reduction voltage circuit, transformer step-down circuit or capacity voltage dropping circuit.
Described load circuit adopts in parallel or in series by several LED or miniature bulb, or is fractional motor, small household appliances.
Switching circuit of the present utility model, arranges an ON-OFF control circuit between load circuit (this load circuit can be the power circuits such as illumination, small household appliances) and charging device.It can identify that this circuit and external power grid thoroughly disconnect automatically, be connected to without three kinds of states on the external power grid on external power grid when power and when being connected to power supply by described starting switch by described starting switch, and according to the connection of the demand automatic switching on preset or disconnection charging device and load circuit.The utility model structure is simple, stable performance, safe and reliable, whole circuit element used is few, and cost of investment is low.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of embodiment 1.
Fig. 3 is the circuit theory diagrams of embodiment 2.
Fig. 4 is the circuit theory diagrams of embodiment 3.
Fig. 5 is the circuit theory diagrams of embodiment 4.
Fig. 6 is the circuit theory diagrams of embodiment 5.
Fig. 7 is the circuit theory diagrams of embodiment 6.
Fig. 8 is the circuit theory diagrams of embodiment 7.
Fig. 9 is the circuit theory diagrams of embodiment 8.
Figure 10 is the circuit theory diagrams of embodiment 9.
Figure 11 is the circuit theory diagrams of embodiment 10.
Figure 12 is the circuit theory diagrams of embodiment 11.
Reference numeral is as follows:
Starting switch K1, the first transistor Q1, first metal-oxide-semiconductor M1, first amplifier pipe U1, coupling coil T1, current-limiting resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 11 resistance R11, 13 resistance R13, 15 resistance R15, first electric capacity C1, decompression capacitor C3, 12 electric capacity C12, 5th rectifying tube D5, 6th rectifying tube D6, tenth rectifying tube D10, 11 rectifying tube D11, 12 rectifying tube D12.
Embodiment
As shown in Figure 1, the switching circuit with emergency starting function power device of the present utility model is arranged between load circuit (this load circuit can be general lighting circuit, LED illumination circuit or small household appliances load) and external power grid.It comprises be connected to this circuit the starting switch K1 of input " 1 " between pin with external power grid, be connected to the reduction voltage circuit between described input " 1 " pin and input " 2 " pin of this circuit, the charging device be connected with reduction voltage circuit, this charging device provide the load circuit of electric energy and the ON-OFF control circuit between charging device and load circuit.This ON-OFF control circuit can disconnect (disconnect and namely refer to close described starting switch K1) at this switching circuit or be connected according to the demand preset and (connect and namely refer to open described starting switch K1 with external power grid, in the case, point to have power supply and without power supply two kinds) under situation, automatic switching on or disconnect the connection of described charging device and described load circuit.Current-limiting resistance R1 is also provided with between described charging device feeder ear and described input " 1 " pin.
Described reduction voltage circuit can be full-wave rectifying circuit, half-wave rectifying circuit, Switching Power Supply reduction voltage circuit, transformer step-down circuit or capacity voltage dropping circuit.
Embodiment 1
As shown in Figure 2, described ON-OFF control circuit comprises the first transistor Q1, the first metal-oxide-semiconductor M1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and the first electric capacity C1; Wherein, the collector electrode of described the first transistor Q1 is connected to the grid of the first metal-oxide-semiconductor M1, its grounded emitter, base stage is connected to described input " 2 " pin by the second resistance R2, between the base stage that described 3rd resistance R3 and the first electric capacity C1 is connected to the first transistor Q1 and emitter; The source electrode of the first metal-oxide-semiconductor M1 is connected to the feeder ear (hereinafter referred to as anode) of described charging device, and its drain electrode is connected to load circuit by the 11 resistance R11, and the 4th resistance R4 is between the grid and source electrode of the first metal-oxide-semiconductor M1.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage flows to the 8th resistance R8 by current-limiting resistance R1, described input " 1 " pin is flow to through the 8th resistance R8, this input " 1 " pin is high level, now, described input " 1 " pin and input " 2 " pin disconnect, input " 2 " pin is no-voltage condition, second resistance R2 no current, the first transistor Q1 ends without bias voltage because of base stage, therefore, its collector electrode no current, first metal-oxide-semiconductor M1 ends, load circuit (namely refers to LED1, LED2, LED3) do not work.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, described input " 1 " pin is by after decompression capacitor C3, (diode D1 is namely referred to by reduction voltage circuit, D2, D3 and D4) charge to described battery, simultaneously, the positively biased alternating voltage (battery generating positive and negative voltage median) of input " 2 " pin is input to the base stage (the first electric capacity C1 plays pressure stabilization function) of the first transistor Q1 by the second resistance R2, make the first transistor Q1 conducting, voltage is had between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage flows to the 8th resistance R8 by current-limiting resistance R1, input " 1 " pin is flow to again through the 8th resistance R8, the positive voltage of input " 1 " pin is by starting switch K1, other load in external power grid is (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin, the base stage of the first transistor Q1 is flow to again by the second resistance R2, the first transistor Q1 conducting, voltage is had between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, load circuit bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
Embodiment 2
As shown in Figure 3, except being connected with between described anode and reduction voltage circuit and adopting the switching circuit step-down of coil coupling mode, other structure is identical with embodiment 1.
Described switching circuit comprises coupling coil T1, the 11 transistor Q11.Wherein, the grounded emitter of the 11 transistor Q11, its base stage connects reduction voltage circuit by the 13 resistance R13 by the 5th rectifying tube D5, its collector electrode one tunnel connects an end points of coupling coil T1 primary coil, and the 11 rectifying tube D11 and the 15 resistance R15, the 12 electric capacity C12 in parallel of separately leading up to is connected to the 5th rectifying tube D5.Secondary coil one end ground connection of coupling coil T1, the other end connects described anode by the tenth rectifying tube D10.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage flows to input " 1 " pin by current-limiting resistance R1, input " 1 " pin is that high level is (by the second rectifying tube D2, 5th rectifying tube D5, 13 resistance R13 and the 11 transistor Q11, have portion of electrical current and be diverted to ground, because each rectifying tube has the conducting pressure reduction of about 0.6V, so also have the voltage of more than 1V at input " 1 " pin, 5th rectifying tube D5 strengthens reliability increase for improving this voltage), this voltage can not flow to input " 2 " pin from input " 1 " pin, input " 2 " pin is no-voltage condition, second resistance R2 no current, the base stage of the first transistor Q1 is ended without bias voltage, its collector electrode no current, first metal-oxide-semiconductor M1 ends, load circuit (namely refers to LED1, LED2, LED3) not bright light.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, its process is identical with embodiment 1.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, its process is identical with embodiment 1.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, load circuit bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
The present embodiment can provide larger electrical current.
Embodiment 3
As shown in Figure 4, described ON-OFF control circuit comprises the first transistor Q1, the first metal-oxide-semiconductor M1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and the first electric capacity C1; Wherein, the collector electrode of described the first transistor Q1 is connected to the grid of the first metal-oxide-semiconductor M1, its grounded emitter, base stage is connected to described input " 1 " pin by the second resistance R2, between the base stage that described 3rd resistance R3 and the first electric capacity C1 is connected to the first transistor Q1 and emitter; The source ground of the first metal-oxide-semiconductor M1, its drain electrode is connected to described anode by load circuit, the 11 resistance R11, and the 4th resistance R4 is between the grid and described anode of the first metal-oxide-semiconductor M1.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage flows to described input " 1 " pin by current-limiting resistance R1, this input " 1 " pin is high level, this voltage is through the 8th resistance R8, to the second resistance R2 bias voltage, the first transistor Q1 has voltage turn-on because of base stage, its collector voltage drags down, between the first metal-oxide-semiconductor M1 source electrode and grid, no-voltage ends, load circuit (namely referring to LED1, LED2, LED3) not bright light.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, described input " 1 " pin is by after decompression capacitor C3, (diode D1 is namely referred to by reduction voltage circuit, D2, D3 and D4) charge to described battery, simultaneously, the positively biased alternating voltage (battery generating positive and negative voltage median) of decompression capacitor C3 is input to the base stage (the first electric capacity C1 plays pressure stabilization function) of the first transistor Q1 by the second resistance R2, the first transistor Q1 is made to have voltage turn-on because of base stage, its collector voltage drags down, no-voltage cut-off between the first metal-oxide-semiconductor M1 source electrode and grid, load circuit (namely refers to LED1, LED2, LED3) not bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage is added on described input " 1 " pin by current-limiting resistance R1, other load in described starting switch K1, external power grid of this voltage is (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin, then branch to ground by the 5th resistance R5 connected with input " 2 " pin.Now, input " 1 " pin voltage base voltage that is lower, the first transistor Q1 is lower, and the first transistor Q1 ends, and has voltage between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely referring to LED1, LED2, LED3) bright light.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, and load circuit is bright light not;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
The present embodiment is when external power grid charges the battery, and load circuit is bright light not.
Embodiment 4
As shown in Figure 5, the present embodiment is except reduction voltage circuit is different from embodiment 3, and other structure is substantially the same manner as Example 3.
Reduction voltage circuit in the present embodiment is halfwave rectifier, in addition, arranges the 6th rectifying tube D6 between the second resistance R2 and described input " 1 " pin.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage flows to described input " 1 " pin by current-limiting resistance R1, this input " 1 " pin is high level, this voltage is through the 8th resistance R8, to the second resistance R2 bias voltage, the first transistor Q1 has voltage turn-on because of base stage, its collector voltage drags down, between the first metal-oxide-semiconductor M1 source electrode and grid, no-voltage ends, load circuit (namely referring to LED1, LED2, LED3) not bright light.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, described input " 1 " pin is by after decompression capacitor C3, (diode D1 is namely referred to by reduction voltage circuit, D2) charge to described battery, simultaneously, the positively biased alternating voltage (battery generating positive and negative voltage median) of decompression capacitor C3 is by the 6th rectifying tube D6, second resistance R2 is input to the base stage (the first electric capacity C1 plays pressure stabilization function) of the first transistor Q1, the first transistor Q1 is made to have voltage turn-on because of base stage, its collector voltage drags down, no-voltage cut-off between the first metal-oxide-semiconductor M1 source electrode and grid, load circuit (namely refers to LED1, LED2, LED3) not bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage is added on described input " 1 " pin by current-limiting resistance R1, this voltage other load in described starting switch K1, external power grid (usually when without power supply, the total resistance of the load in external power grid is low resistance) flows to input " 2 " pin to ground.Now, input " 1 " pin voltage base voltage that is lower, the first transistor Q1 is lower, and the first transistor Q1 ends, first metal-oxide-semiconductor M1 grid potential is drawn high, voltage is had, the first metal-oxide-semiconductor M1 conducting, load circuit (namely referring to LED1, LED2, LED3) bright light between its source electrode and grid.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, and load circuit is bright light not;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
Embodiment 5
As shown in Figure 6, the present embodiment is except use transformer step-down circuit, and other structure is substantially the same manner as Example 1.
The course of work of the present embodiment is substantially the same manner as Example 1.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage flows input " 1 " pin by current-limiting resistance R1, the the first voltage-stabiliser tube Z1 being arranged at transformer input " 1 " pin stops that voltage flows directly to transformer input " 1 " pin, this input " 1 " pin is high level, now, described input " 1 " pin and input " 2 " pin disconnect, input " 2 " pin is low-voltage state, second resistance R2 no current, the first transistor Q1 ends without bias voltage because of base stage, therefore, its collector electrode no current, first metal-oxide-semiconductor M1 ends, load circuit (namely refers to LED1, LED2, LED3) do not work.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, described input voltage is by after transformer pressure-reducing, (diode D1 is namely referred to by reduction voltage circuit, D2, D3 and D4) charge to described battery, simultaneously, the alternating voltage of input " 2 " pin is input to the base stage (the first electric capacity C1 plays pressure stabilization function) of the first transistor Q1 by the second resistance R2, make the first transistor Q1 conducting, voltage is had between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage flows to input " 1 " pin by current-limiting resistance R1, the positive voltage of input " 1 " pin is by starting switch K1, other load in external power grid is (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin, the base stage of the first transistor Q1 is flow to by the second resistance R2, the first transistor Q1 conducting, voltage is had between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, load circuit bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
Embodiment 6
As shown in Figure 7, described ON-OFF control circuit comprises the first metal-oxide-semiconductor M1, current-limiting resistance R1, the 3rd resistance R3, the 5th resistance R5 and the first electric capacity C1; Wherein, the grid of described first metal-oxide-semiconductor M1 connects described input " 1 " pin by current-limiting resistance R1, the 8th resistance, its drain electrode connects load circuit by the 11 resistance R11, its source electrode connects anode, between the source electrode that described 3rd resistance R3 and the first electric capacity C1 is connected to the first metal-oxide-semiconductor M1 and grid.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage is added on the grid of the first metal-oxide-semiconductor M1 by R3, this pipe ends because of no-voltage difference between source electrode and grid, and load circuit (namely referring to LED1, LED2, LED3) does not work.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, described input " 1 " pin is by after decompression capacitor C3, (diode D1 is namely referred to by reduction voltage circuit, D2, D3 and D4) charge to described battery, simultaneously, input " 1 " pin imposes on by current-limiting resistance R1 the voltage difference (the first electric capacity C1 plays pressure stabilization function) that the first metal-oxide-semiconductor M1 grid is less than its source electrode, make there is voltage between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage is by the 3rd resistance R3, current-limiting resistance R1 and the 8th resistance R8 flows to input " 1 " pin, the positive voltage of input " 1 " pin is by starting switch K1, other load in external power grid is (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin again through R5 to ground, now, voltage is had between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, load circuit bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
Embodiment 7
As shown in Figure 8, described ON-OFF control circuit comprises the first metal-oxide-semiconductor M1, the second resistance R2, the 3rd resistance R3 and the first electric capacity C1; Wherein, the grid of the first metal-oxide-semiconductor M1 is connected to described input " 2 " pin by the second resistance R2, its source ground, its drain electrode is connected to described anode by load circuit, the 11 resistance R11, and described 3rd resistance R3 and the first electric capacity C1 is connected between its grid and source electrode.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage cannot make current-limiting resistance R1, the 8th resistance R8, input " 1 " pin, input " 2 " pin form loop, therefore, the grid no-voltage of the first metal-oxide-semiconductor M1, this pipe ends because of no-voltage difference between source electrode and grid, and load circuit (namely referring to LED1, LED2, LED3) does not work.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, described input " 1 " pin is by after decompression capacitor C3, (diode D1 is namely referred to by reduction voltage circuit, D2, D3 and D4) charge to described battery, simultaneously, the positively biased alternating voltage (battery generating positive and negative voltage median) of input " 2 " pin imposes on the first metal-oxide-semiconductor M1 grid by the second resistance R2, make there is voltage between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage by current-limiting resistance R1, the 8th resistance R8, input " 1 " pin, starting switch K1, other load in external power grid (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin, in like manner, make there is voltage between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely referring to LED1, LED2, LED3) bright light.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, load circuit bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
Embodiment 8
As shown in Figure 9, except be connected with between described anode and reduction voltage circuit adopt coil coupling mode switching circuit step-down branch road except, other structure is substantially the same manner as Example 8.
Described switching circuit step-down branch road comprises coupling coil T1, the 11 transistor Q11.Wherein, the emitter of the 11 transistor Q11 connects high pressure ground, its base stage connects reduction voltage circuit by the 13 resistance R13 by the 5th rectifying tube D5, its collector electrode one tunnel connects an end points of coupling coil T1 primary coil, and the 11 rectifying tube D11 and the 15 resistance R15, the 12 electric capacity C12 in parallel of separately leading up to is connected to the 5th rectifying tube D5.Secondary coil one end ground connection of coupling coil T1, the other end connects described anode by the 12 rectifying tube D12.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage flows to input " 1 " pin by current-limiting resistance R1, input " 1 " pin is that high level is (by the second rectifying tube D2, 5th rectifying tube D5, 13 resistance R13 and the 11 transistor Q11, have portion of electrical current and be diverted to ground, because each rectifying tube has the conducting pressure reduction of about 0.6V, so also have the voltage of more than 1V at input " 1 " pin, 5th rectifying tube D5 strengthens reliability increase for improving this voltage), this voltage can not flow to input " 2 " pin from input " 1 " pin, input " 2 " pin is no-voltage condition, second resistance R2 no current, first metal-oxide-semiconductor M1 ends because of no-voltage between its source electrode and grid, load circuit (namely refers to LED1, LED2, LED3) not bright light.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, described input " 1 " pin is by giving the charging of described battery after Switching Power Supply step-down, simultaneously, the alternating voltage (about 220 of input " 2 " pin, the high pressure ground of this Switching Power Supply connects without direct with low pressure ground) be made into direct current by the 6th rectifying tube D6, the grid (the voltage-stabiliser tube Z1 be wherein connected on R3 is not broken down by high-voltage for the protection of the first metal-oxide-semiconductor M1) of the first metal-oxide-semiconductor M1 is input to again through the second resistance R2, voltage is had between the first metal-oxide-semiconductor M1 source electrode and grid, firstth metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage by current-limiting resistance R1, input " 1 " pin, starting switch K1, other load in external power grid (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin, in like manner, make there is voltage between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely referring to LED1, LED2, LED3) bright light.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, load circuit bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
Thermally directly being connected with low pressure ground nothing of the present embodiment breaker in middle circuit is beneficial to the fail safe of raising low-pressure section.
Embodiment 9
As shown in Figure 10, described ON-OFF control circuit comprises the first transistor Q1, the first metal-oxide-semiconductor M1, current-limiting resistance R1, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the first electric capacity C1; Wherein, the collector electrode of described the first transistor Q1 is connected to the grid of the first metal-oxide-semiconductor M1, its emitter is connected to anode, and base stage is connected to described input " 1 " pin by current-limiting resistance R1, between the base stage that described 3rd resistance R3 and the first electric capacity C1 is connected to the first transistor Q1 and emitter; The source ground of the first metal-oxide-semiconductor M1, its drain electrode is connected to described anode by load circuit, the 11 resistance R11, and the 4th resistance R4 is between the grid and source electrode of the first metal-oxide-semiconductor M1.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), the first transistor Q1 base stage is ended without bias voltage, first metal-oxide-semiconductor M1 because ending without pressure reduction between source electrode and grid, load circuit (namely referring to LED1, LED2, LED3) not bright light.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, the charging of described battery is given by rectification circuit, simultaneously, the base stage of the first transistor Q1 drags down and conducting (the first electric capacity C1 plays pressure stabilization function) because of current-limiting resistance R1, first metal-oxide-semiconductor M1 because having voltage turn-on between source electrode and grid, load circuit (namely referring to LED1, LED2, LED3) bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage is by the first transistor Q1 emitter, base stage, current-limiting resistance R1, 8th resistance R8, input " 1 " pin, other load in starting switch K1 and external power grid is (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin and the 5th resistance R5 to ground, the first transistor Q1 conducting, first metal-oxide-semiconductor M1 is because having voltage turn-on between source electrode and grid, load circuit (namely refers to LED1, LED2, LED3) bright light.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, load circuit bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
Embodiment 10
As shown in figure 11, described ON-OFF control circuit comprises the first amplifier pipe U1, current-limiting resistance R1, the second resistance R2, the 3rd resistance R3, the 6th resistance R6, the 7th resistance R7 and the first electric capacity C1; Wherein, the forward input pin of the first amplifier pipe U1 is connected to described input " 2 " pin by the second resistance R2, reverse input pin leads up to the 7th resistance R7 ground connection, and the 6th resistance R6 of separately leading up to is connected to described anode, and its output pin is by the 11 resistance R11, load circuit ground connection; Described 3rd resistance R3 and the first electric capacity C1 is connected between its forward input pin and ground.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), described input " 2 " pin is no-voltage condition, first amplifier pipe U1 forward input pin current potential is lower than reverse input pin current potential, the output pin Non voltage output of the first amplifier pipe U1, load circuit (namely referring to LED1, LED2, LED3) not bright light.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, input " 1 " pin alternating voltage is by decompression capacitor C3, reduction voltage circuit charges the battery, simultaneously, the positively biased alternating voltage (battery generating positive and negative voltage median) of input " 2 " pin flows to the forward input pin (the first electric capacity C1 plays pressure stabilization function) of the first amplifier pipe U1 by the second resistance R2, first amplifier pipe U1 forward input pin voltage is higher than reverse input pin voltage, the output pin of the first amplifier pipe U1 is positive voltage, load circuit (namely refers to LED1, LED2, LED3) bright light.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, anode voltage is by current-limiting resistance R1, 8th resistance R8, input " 1 " pin, other load in starting switch K1 and external power grid is (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin and the second resistance R2 flows to the first amplifier pipe U1 forward input pin, forward input pin voltage is higher than reverse input pin voltage, the output pin of the first amplifier pipe U1 is positive voltage, load circuit (namely refers to LED1, LED2, LED3) bright light.
That is:
When described starting switch K1 closes, load circuit is bright light not;
Starting switch K1 opens and external power grid when powering, load circuit bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit bright light.
The present embodiment can make the change of the reverse input pin of the first amplifier pipe U1 carry out the bright or not bright light of control load circuit by changing mode of connection.
Embodiment 11
As shown in figure 12, the present embodiment between described reduction voltage circuit and anode, sets up over-charging of battery testing circuit and over-charging of battery shunt circuit on the basis of embodiment 1; Another road reduction voltage circuit and load circuit (namely referring to LED11, LED12, LED13) is parallel with in addition between described input " 1 " pin and input " 2 " pin.Other structure is substantially the same manner as Example 1.
Described over-charging of battery testing circuit is made up of controllable accurate source of stable pressure U11, the 13 resistance R13 and the 14 resistance R14 of TL431; Described over-charging of battery shunt circuit is made up of the tenth two-transistor Q12, the 15 resistance R15 and the 15 rectifying tube D15 of 8550PNP type.
Wherein, 13 resistance R13 and the 14 resistance R14 is connected in series and forms bleeder circuit between described reduction voltage circuit and ground are held, the reference pole of controllable accurate source of stable pressure U11 is connected to the 13 resistance R13 and the 14 resistance R14 tie point, its plus earth, its negative electrode is connected to the base stage of the tenth two-transistor Q12 and is connected to reduction voltage circuit by the 15 resistance R15, the 15 rectifying tube D15, the 5th rectifying tube D5, and the emitter of the tenth two-transistor Q12 is connected to anode by the 17 rectifying tube D17; The collector electrode of the tenth two-transistor Q12 is leaded up to the 11 resistance R11 and is connected to load circuit, and another road is connected to the drain electrode of the first metal-oxide-semiconductor M1.
The 11 metal-oxide-semiconductor M11 is also provided with between anode and the first metal-oxide-semiconductor M1.
The operation principle of over-charging of battery testing circuit and over-charging of battery shunt circuit:
When inputting " 1 " pin and not inputting, the bleeder circuit no current that the 13 resistance R13, the 14 resistance R14 are formed flows through, and controllable accurate source of stable pressure U1, the tenth two-transistor Q12 cut-off do not work, and the 15 rectifying tube D15 can prevent battery current from flowing backwards.
When inputting " 1 " pin and having power supply, electric current is by the 5th rectifying tube D5, to battery charging, (the positive terminal potential of the 17 rectifying tube D17 of conducting exceeds about 0.7V than negative terminal current potential to 17 rectifying tube D17, namely the current potential of the 17 rectifying tube D17 anode fixedly can exceed the pressure drop of about 0.7V than the current potential of battery forward input " 2 " pin, this pressure drop can be different according to different diodes, the pressure drop of a reduction voltage circuit output voltage diode higher than cell voltage all the time), 13 resistance R13, two or four resistance R14 is to power end voltage, the controllable accurate source of stable pressure U11 connected compares voltage, when voltage is lower, controllable accurate source of stable pressure U11 ends, tenth two-transistor Q12 also ends.When voltage reaches junction voltage (about 2.5V) conduction value of controllable accurate source of stable pressure U11, controllable accurate source of stable pressure U11 and the tenth two-transistor Q12 conducting, electric current flows to load circuit consumed from the tenth two-transistor Q12 collector electrode.
This structure can when battery be full of (during the reserve of electricity higher limit set), source current is guided to load circuit, as LED display lamp, heater, fractional motor or fraction function element, put less than or equal to setting to make the voltage of battery when charging.Guarantee that battery there will not be the phenomenon overcharged, available protecting battery, extends battery greatly.
The course of work of the present embodiment:
1) when described starting switch K1 is in closed condition (when this switching circuit and external power grid disconnect), anode voltage is by current-limiting resistance R1, the 8th resistance R8 extremely input " 1 " pin, input " 1 " pin is high level, but input " 1 " pin and input " 2 " pin disconnect, input " 2 " pin is no-voltage condition, second resistance R2 no current, the first transistor Q1 ends without bias voltage because of base stage, its collector electrode no current, first metal-oxide-semiconductor M1 ends, load circuit (namely referring to LED1, LED2, LED3) not bright light.
2) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid has a power supply, input " 1 " pin is charged the battery by reduction voltage circuit, the 5th rectifying tube D5 and the 17 rectifying tube D17, simultaneously, because the grid voltage of the 11 metal-oxide-semiconductor M11 is higher than its source voltage, 11 metal-oxide-semiconductor M11 ends, 11 metal-oxide-semiconductor M11 drain electrode Non voltage output, load circuit (namely referring to LED1, LED2, LED3) not bright light.And another road load circuit (namely referring to LED11, LED12, LED13) bright light of parallel connection.
3) when described starting switch K1 is in opening (namely this switching circuit is connected on external power grid) and external power grid without power supply time, voltage is had between the 11 metal-oxide-semiconductor M11 source electrode and grid, drain electrode has output, anode voltage is by current-limiting resistance R1, 8th resistance R8, input " 1 " pin, other load in starting switch K1 and external power grid is (usually when without power supply, the total resistance of load in external power grid is low resistance) flow to input " 2 " pin, the first transistor Q1 base stage is flow to by the second resistance R2, the first transistor Q1 conducting, voltage is had between the first metal-oxide-semiconductor M1 source electrode and grid, first metal-oxide-semiconductor M1 conducting, load circuit (namely refers to LED1, LED2, LED3) bright light.And another road load circuit (namely referring to LED11, LED12, LED13) of parallel connection is because of without to power not bright light.
That is:
When described starting switch K1 closes, load circuit (namely referring to LED1, LED2, LED3) not bright light;
Starting switch K1 opens and external power grid when powering, load circuit (namely referring to LED1, LED2, LED3) not bright light;
Starting switch K1 open and external power grid have a power failure time, load circuit (namely referring to LED1, LED2, LED3) bright light.
Because the efficiency of the more capacitance decompressions of LED of series connection can be higher, and even two-way circuit has more use value, so another road reduction voltage circuit in parallel in the present embodiment and load circuit are equally applicable to aforesaid all embodiments.
Load circuit in above-mentioned all embodiments can adopt in parallel or in series by several LED or miniature bulb, or can be fractional motor, small household appliances etc.
Switching circuit of the present utility model applies a direct voltage or electric current, by detecting this voltage or electric current makes load circuit realize when being connected to external power grid and do not power automatically turning on light to interchange input " 1 " pin.
Illustrate: when grid power blackout, usually electrical network all can and be connected with a lot of load (as fan transformer, incandescent lamp etc.), electrical network is at this time equivalent to the resistance of a very little resistance, and just there is not this resistance, lighting device of the present utility model when lighting device disconnects from electrical network, realize being connected to electrical network by detecting this resistance, but automatically turn on light when not powering, and disconnect electrical network and can not turn on light.
Switching circuit of the present utility model can also the circuit of or in series New function in parallel with other Intelligent switching circuit, also can increase multistage current amplification circuit thereafter.
Claims (9)
1. one kind has the switching circuit of emergency starting function power device, to comprise between input " 1 " starting switch between pin with external power grid (K1) being connected to this circuit, input " 2 " pin being connected described input " 1 " pin and this circuit and the reduction voltage circuit charged for charging device and the load circuit that electric energy is provided by this charging device, it is characterized in that: be also provided with in described load circuit loop with described starting switch (K1) unlatching or close automatic switching on or disconnect the ON-OFF control circuit that described charging device is connected with this load circuit; Current-limiting resistance (R1) is provided with between described charging device feeder ear and described input " 1 " pin.
2. the switching circuit with emergency starting function power device according to claim 1, is characterized in that: described ON-OFF control circuit comprises the first transistor (Q1), the first metal-oxide-semiconductor (M1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) and the first electric capacity (C1); Wherein, the collector electrode of described the first transistor (Q1) is connected to the grid of the first metal-oxide-semiconductor (M1), its grounded emitter, base stage is connected to described input " 1 " pin or input " 2 " pin, between the base stage that described 3rd resistance (R3) and the first electric capacity (C1) are connected to the first transistor (Q1) and emitter by the second resistance (R2); The source electrode of the first metal-oxide-semiconductor (M1) is connected to the feeder ear of described charging device, its drain electrode is connected to load circuit by the 11 resistance (R11), 4th resistance (R4) is between the grid and source electrode of the first metal-oxide-semiconductor (M1), or, the source ground of the first metal-oxide-semiconductor (M1), its drain electrode is connected to the feeder ear of described charging device by load circuit, the 11 resistance (R11), the 4th resistance (R4) is between the grid and the feeder ear of charging device of the first metal-oxide-semiconductor (M1).
3. the switching circuit with emergency starting function power device according to claim 1, is characterized in that: described ON-OFF control circuit comprises the first metal-oxide-semiconductor (M1), the second resistance (R2), the 3rd resistance (R3) and the first electric capacity (C1); Wherein, the grid of the first metal-oxide-semiconductor (M1) is connected to described input " 2 " pin by the second resistance (R2), its source ground, its drain electrode is connected to the feeder ear of described charging device by load circuit, the 11 resistance (R11), described 3rd resistance (R3) and the first electric capacity (C1) are connected between its grid and source electrode.
4. the switching circuit with emergency starting function power device according to claim 1, is characterized in that: described ON-OFF control circuit comprises the first transistor (Q1), the first metal-oxide-semiconductor (M1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) and the first electric capacity (C1); Wherein, the collector electrode of described the first transistor (Q1) is connected to the grid of the first metal-oxide-semiconductor (M1), its emitter is connected to the feeder ear of charging device, base stage is connected to described input " 1 " pin, between the base stage that described 3rd resistance (R3) and the first electric capacity (C1) are connected to the first transistor (Q1) and emitter by the second resistance (R2); The source ground of the first metal-oxide-semiconductor (M1), its drain electrode is connected to the feeder ear of described charging device by load circuit, the 11 resistance (R11), the 4th resistance (R4) is between the grid and source electrode of the first metal-oxide-semiconductor (M1).
5. the switching circuit with emergency starting function power device according to claim 1, is characterized in that: described ON-OFF control circuit comprises the first amplifier pipe (U1), the second resistance (R2), the 3rd resistance (R3), the 6th resistance (R6), the 7th resistance (R7) and the first electric capacity (C1); Wherein, the forward input pin of the first amplifier pipe (U1) is connected to described input " 2 " pin by the second resistance (R2), reverse input pin leads up to the 7th resistance (R7) ground connection, the 6th resistance (R6) of separately leading up to is connected to the feeder ear of described charging device, and its output pin is by the 11 resistance (R11), load circuit ground connection; Described 3rd resistance (R3) and the first electric capacity (C1) are connected between its forward input pin and ground.
6. the switching circuit with emergency starting function power device according to claim 2, is characterized in that: between described reduction voltage circuit and charging device feeder ear, set up battery over-discharge protection circuit and over-charging of battery protective circuit.
7. the switching circuit with emergency starting function power device according to any one of claim 2-6, is characterized in that: between described input " 1 " pin and input " 2 " pin, be also parallel with another road reduction voltage circuit and load circuit.
8. the switching circuit with emergency starting function power device according to claim 7, is characterized in that: described reduction voltage circuit can be full-wave rectifying circuit, half-wave rectifying circuit, Switching Power Supply reduction voltage circuit, transformer step-down circuit or capacity voltage dropping circuit.
9. the switching circuit with emergency starting function power device according to claim 1, is characterized in that: described load circuit adopts in parallel or in series by several LED or miniature bulb, or is fractional motor, small household appliances.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520295900.3U CN204598407U (en) | 2015-05-08 | 2015-05-08 | There is the switching circuit of emergency starting function power device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520295900.3U CN204598407U (en) | 2015-05-08 | 2015-05-08 | There is the switching circuit of emergency starting function power device |
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| CN204598407U true CN204598407U (en) | 2015-08-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104837259A (en) * | 2015-05-08 | 2015-08-12 | 申勇兵 | Switching circuit for electric device with emergency starting function |
| CN105323923A (en) * | 2015-10-27 | 2016-02-10 | 浙江生辉照明有限公司 | Light emitting diode (LED) intelligent control circuit and LED lighting device |
| CN105554959A (en) * | 2016-02-03 | 2016-05-04 | 申勇兵 | Intelligent control circuit for multifunctional lighting device |
| CN109672255A (en) * | 2019-02-25 | 2019-04-23 | 威胜信息技术股份有限公司 | Standby capacitor charge and discharge circuit, charging/discharging thereof and its fault detector |
| CN113163556A (en) * | 2021-05-08 | 2021-07-23 | 深圳市必易微电子股份有限公司 | Load drive suppression circuit and load power supply system |
-
2015
- 2015-05-08 CN CN201520295900.3U patent/CN204598407U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104837259A (en) * | 2015-05-08 | 2015-08-12 | 申勇兵 | Switching circuit for electric device with emergency starting function |
| CN105323923A (en) * | 2015-10-27 | 2016-02-10 | 浙江生辉照明有限公司 | Light emitting diode (LED) intelligent control circuit and LED lighting device |
| CN105323923B (en) * | 2015-10-27 | 2018-11-30 | 浙江生辉照明有限公司 | LED intelligent control circuit and LED light device |
| CN105554959A (en) * | 2016-02-03 | 2016-05-04 | 申勇兵 | Intelligent control circuit for multifunctional lighting device |
| CN109672255A (en) * | 2019-02-25 | 2019-04-23 | 威胜信息技术股份有限公司 | Standby capacitor charge and discharge circuit, charging/discharging thereof and its fault detector |
| CN113163556A (en) * | 2021-05-08 | 2021-07-23 | 深圳市必易微电子股份有限公司 | Load drive suppression circuit and load power supply system |
| CN113163556B (en) * | 2021-05-08 | 2023-04-25 | 深圳市必易微电子股份有限公司 | Load drive suppression circuit and load power supply system |
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