CN209823498U - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN209823498U CN209823498U CN201920304296.4U CN201920304296U CN209823498U CN 209823498 U CN209823498 U CN 209823498U CN 201920304296 U CN201920304296 U CN 201920304296U CN 209823498 U CN209823498 U CN 209823498U
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- power supply
- circuit
- electrolytic capacitor
- supply branch
- diode
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- 239000003990 capacitor Substances 0.000 claims abstract description 120
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000007599 discharging Methods 0.000 claims abstract description 20
- 239000010409 thin film Substances 0.000 claims description 32
- 239000010408 film Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 abstract description 9
- 238000005868 electrolysis reaction Methods 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 241001465382 Physalis alkekengi Species 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides a power supply circuit, which comprises a first power supply branch and a second power supply branch, wherein the first power supply branch is configured to supply power to a main power loop; the second power supply branch circuit is configured to supply power to the control circuit and comprises an electrolytic capacitor EC1, a charging circuit, a detection circuit, a discharging circuit and a film capacitor C2, wherein the charging circuit charges the electrolytic capacitor EC1 and the film capacitor C2 when the external power supply is powered on; the detection circuit detects the pressure difference value between the film capacitor C2 and the electrolytic capacitor EC 1; when the detection circuit detects that the differential pressure value exceeds the preset value, the electrolytic capacitor EC1 discharges to the film capacitor C2 through the discharge circuit. The utility model discloses not only can maintain control circuit work a period through the second power supply branch road after the external power source outage, but also can control power supply circuit and not carry out the charge-discharge at the in-process electrolytic capacitor EC1 of normal work to the problem of the unsatisfied requirement of main power return circuit harmonic that brings in the electrolytic capacitor EC1 charge-discharge process has been solved.
Description
Technical Field
The utility model relates to the field of lighting technology, especially, relate to a power supply circuit.
Background
For some electric equipment, the harmonic current of the electric equipment needs to be limited when the power reaches the regulatory requirement, and the regulatory requirement can be specified in standard IEC61000-3-2 or national standard GB 17625.1. For example, when the power of the lamp product is greater than 25W, the harmonic requirement is relatively strict, and 3 rd harmonic is required to be less than 0.3 x λ (λ is the product power factor), 5 th harmonic is required to be less than 10%, 7 th harmonic is required to be less than 7%, 9 th harmonic is required to be less than 5%, and harmonic above 11 is required to be less than 3%.
For many smart control products, it is often required that a control chip or MCU (micro controller Unit) or the like remains in operation for a period of time after power is turned off. In the prior art, electrolytic energy storage is generally used for maintaining the continuous work of the chip, but the harmonic current of the product cannot meet the requirements of regulations due to the electrolytic charge-discharge process. For example, when the intelligent control product has no energy storage electrolysis circuit, the current waveform is as shown in fig. 1, the waveform is smooth and close to a sine wave, and the harmonic current meets the requirements of the regulations. For another example, after an energy storage electrolysis circuit is added to an intelligent control product, the current waveform is shown in fig. 2, and since electrolysis needs to be charged at a high voltage, a current spike occurs at the top of the waveform, so that harmonic current no longer meets the regulatory requirements. The harmonics corresponding to the current waveforms of fig. 1 and 2, respectively, are shown in table 1.
| Condition | 3 rd harmonic | Harmonic of 5 th order | Harmonic of order 7 | Harmonic of order 9 | Harmonic of order 11 | Results |
| Without electrolysis | 17.26 | 2.55 | 2.77 | 2.56 | 1.33 | Qualified |
| With electrolysis | 14.57 | 3.95 | 2.86 | 1.16 | 3.18 | Fail to be qualified |
TABLE 1
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention has been made in order to provide a supply circuit that overcomes or at least partially solves the above mentioned problems.
According to an aspect of the present invention, a power supply circuit for supplying power to a smart device having a main power loop and a control circuit is provided, the power supply circuit includes a first power supply branch and a second power supply branch connected in parallel with the first power supply branch, wherein the first power supply branch is configured to supply power to the main power loop; the second power supply branch is configured to supply power to the control circuit and comprises an electrolytic capacitor EC1, a charging circuit, a detection circuit, a discharging circuit and a film capacitor C2, wherein,
the charging circuit is provided with an input end and an output end, the input end of the charging circuit is connected with an external power supply, the output end of the charging circuit is connected with the anode of the electrolytic capacitor EC1, and the charging circuit is configured to charge the electrolytic capacitor EC1 and the thin film capacitor C2 when the external power supply is electrified;
the detection circuit is provided with two detection ends, one end of the detection end is connected between the charging circuit and the electrolytic capacitor EC1, the other end of the detection end is connected with one end of the thin-film capacitor C2, and the detection circuit is configured to detect the voltage difference value between the thin-film capacitor C2 and the electrolytic capacitor EC 1;
the discharge circuit is provided with an input end and an output end, the input end of the discharge circuit is connected with the anode of the electrolytic capacitor EC1, the output end of the discharge circuit is connected with one end of the thin-film capacitor C2, and power is supplied to the control circuit through the discharge circuit by the electrolytic capacitor EC1 when the detection circuit detects that the voltage difference value exceeds a preset value.
Optionally, the power supply circuit further comprises:
and the rectifying module is provided with an input end and an output end, the input end of the rectifying module is connected with the external power supply, the output end of the rectifying module is respectively connected with the first power supply branch and the second power supply branch, the rectifying module is configured to rectify the external power supply and provide rectified current to the first power supply branch and the second power supply branch.
Optionally, the charging circuit comprises a diode D1 and a diode D2,
the diode D1, the anode of which is connected to the output end of the rectifier module, and the cathode of which is connected to the anode of the diode D2 and one end of the thin-film capacitor C2, wherein the diode D1 is configured to prevent the thin-film capacitor C2 from discharging to the first power supply branch;
the diode D2 has its cathode connected to the anode of the electrolytic capacitor EC1, and the diode D2 is configured to prevent the electrolytic capacitor EC1 from discharging to the first power supply branch.
Optionally, the rectifier module comprises a rectifier bridge DB1,
the rectifier bridge DB1 has two input terminals and two output terminals, where the two input terminals are connected to the external power supply, rectifies the received current of the external power supply, and outputs the rectified current to the first power supply branch and the second power supply branch connected in parallel with the first power supply branch through the two output terminals.
Optionally, the detection circuit comprises a voltage regulator tube ZD1, a resistor R1 connected in series with the voltage regulator tube ZD1, a switching element, a diode D3,
the switch element is connected between the resistor R1 and the anode of the diode D3, the cathode of the diode D3 is connected with the thin-film capacitor C2, and the switch element is in an off state when the discharge circuit does not work;
the cathode of the voltage-stabilizing tube ZD1 is connected with the anode of the electrolytic capacitor EC1, the anode of the voltage-stabilizing tube ZD1 is connected with the resistor R1, and the voltage-stabilizing value of the voltage-stabilizing tube ZD1 is greater than the ripple voltage delta V existing on the thin-film capacitor C2.
Optionally, the discharge circuit includes the switching element and a diode D3 shared with the detection circuit, and is configured to control the switching element to open to discharge the electrolytic capacitor EC1 to the thin film capacitor C2 when the detection circuit detects that the voltage difference value exceeds a preset value.
Optionally, the switching element comprises:
and a transistor Q1 having an emitter connected to the anode of the diode D3, a collector connected to the anode of the electrolytic capacitor EC1, and a base connected to the resistor R1.
Optionally, the first power supply branch comprises a film capacitor C1, connected in parallel with the rectifier module, and configured to supply power to the main power loop.
The utility model discloses supply circuit can be used for the smart machine power supply that has main power return circuit and control circuit, mainly include first power supply branch road and rather than parallelly connected second power supply branch road, first power supply branch road configuration is to supplying power to main power return circuit, second power supply branch road configuration is to supplying power to control circuit, it charges for electrolytic capacitor EC1 through charging circuit when external power source begins to go up the electricity for supply circuit, after the external power outage, voltage on the film electric capacity C2 begins to reduce, if detection circuit detects when the difference in voltage between voltage on the film electric capacity C2 and the electrolytic capacitor EC1 exceeds the default, discharge to film electric capacity C2 through discharge circuit by electrolytic capacitor EC 1. Therefore, the embodiment of the utility model provides a not only can maintain control circuit work a period through the second power supply branch road after external power source outage, supply circuit does not charge and discharge at the in-process electrolytic capacitor EC1 of normal work moreover, can make the charging in electrolytic capacitor EC1 maintain at the maximum value to the main power return circuit harmonic that brings among the electrolytic capacitor EC1 charging and discharging process unsatisfied the problem of requirement has been solved.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 illustrates a current waveform diagram for a prior art smart control product without an energy storage electrolysis circuit;
FIG. 2 illustrates a prior art current waveform diagram of a smart control product provided with an energy storage electrolysis circuit;
fig. 3 shows a schematic structural diagram of a power supply circuit according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to solve the technical problem, the embodiment of the utility model provides a supply circuit for to the smart machine power supply that has main power return circuit and control circuit, smart machine here includes intelligent lamps and lanterns, intelligent electrical apparatus and so on, and intelligent lamps and lanterns can be wireless bluetooth product or wired product etc. of adjusting luminance. Fig. 3 shows a schematic structural diagram of a power supply circuit according to an embodiment of the present invention. Referring to fig. 3, the power supply circuit includes a first power supply branch 1 and a second power supply branch 2 connected in parallel thereto, where the first power supply branch 1 is configured to supply power to a main power loop (not shown in the figure) in the smart device, and the second power supply branch 2 is configured to supply power to a control circuit (not shown in the figure), and the control circuit in this embodiment may adopt a low-power consumption control circuit including a control chip or an MCU (micro controller Unit).
The second power supply branch 2 further includes an electrolytic capacitor EC1, a charging circuit 21, a detection circuit 22, a discharging circuit 23, and a film capacitor C2, and the following description will discuss each part of the second power supply branch 2.
The charging circuit 21 has an input terminal and an output terminal, the input terminal of the charging circuit 21 is connected to an external power supply (i.e., commercial power), and the output terminal is connected to the anode of the electrolytic capacitor EC 1. The charging circuit 21 may charge the electrolytic capacitor EC1 and the film capacitor C2 when the external power source is powered on.
The detection circuit 22 has two detection terminals, one terminal of the detection circuit 22 is connected between the charging circuit 21 and the electrolytic capacitor EC1, and the other terminal is connected to one terminal of the thin-film capacitor C2. The detection circuit 22 may detect the differential pressure value between the film capacitance C2 and the electrolytic capacitance EC 1.
The discharging circuit 23 has an input end and an output end, the input end of the discharging circuit 23 is connected with the anode of the electrolytic capacitor EC1, the output end is connected with one end of the film capacitor C2, and when the detection circuit 22 detects that the voltage difference value between the film capacitor C2 and the electrolytic capacitor EC1 exceeds a preset value, the electrolytic capacitor EC1 discharges electricity to the control circuit through the discharging circuit 23, namely, the electricity is supplied to the control circuit through the electrolytic capacitor EC 1. Of course, while the electrolytic capacitor EC1 is discharging to the control circuit, it will also discharge to the film capacitor C2, and the film capacitor C2 will supply power to the control circuit.
In this embodiment, the negative electrode of the electrolytic capacitor EC1 and the other end of the thin-film capacitor C2 are both grounded.
The embodiment of the utility model provides a not only can maintain control circuit work a period through the second power supply branch road after the external power outage, supply circuit does not charge and discharge at the in-process electrolytic capacitor EC1 of normal work moreover, can make charging in the electrolytic capacitor EC1 maintain at the maximum value, can not influence the harmonic of main power return circuit to the main power return circuit harmonic that brings among the electrolytic capacitor EC1 charging and discharging process problem that the requirement is unsatisfied has been solved.
In an embodiment of the present invention, a capacitor with a smaller capacity can be used in the first power supply branch 1, such as the thin film capacitor C1 in fig. 3, and the thin film capacitor C1 is connected in parallel with the rectifier module, and is used for supplying power to the main power loop, so that the main power loop satisfies the high power factor PF.
The utility model discloses an in the embodiment, supply circuit still includes rectifier module, and rectifier module has input and output, and external power source is connected to rectifier module's input, and first power supply branch road 1 and second power supply branch road 2 are connected respectively to the output, configure to and carry out the rectification to external power source to provide the electric current after the rectification to first power supply branch road 1 and second power supply branch road 2.
In an optional implementation of the present invention, the rectifier module may adopt the rectifier bridge DB1 shown in fig. 3, and the rectifier bridge DB1 has two inputs and two outputs, and the external power source is connected to its two inputs, and rectifies the current of the received external power source, and then outputs the rectified current to the first power supply branch 1 and the second power supply branch 2 connected in parallel thereto respectively through its two outputs.
With reference to fig. 3, in an embodiment of the present invention, the charging circuit 21 includes a diode D1 and a diode D2, the anode of the diode D1 is connected to the output end of the rectifying module, and the cathode is connected to the anode of the diode D2 and the ungrounded end of the thin film capacitor C2. The cathode of the diode D2 is connected to the anode of the electrolytic capacitor EC 1. When the external power supply is powered on for the first time, the electrolytic capacitor EC1 and the film capacitor C2 are respectively charged by the bus through the diode D1 and the diode D2, and after the charging is completed, the voltage on the electrolytic capacitor EC1 is the peak value Vinpk of the input voltage (namely, the external power supply voltage), and is about 1.414 Vin (input voltage).
In this embodiment, the diode D1 is used to effectively prevent the film capacitor C2 from discharging into the first power supply branch 1, i.e., prevent the film capacitor C2 from discharging into the main power loop. The diode D2 is used to effectively prevent the electrolytic capacitor EC1 from discharging into the first power supply branch 1, i.e. to prevent the electrolytic capacitor EC1 from discharging into the main power loop.
Referring to fig. 3, in an embodiment of the present invention, the detection circuit 22 may include a voltage regulator ZD1, a resistor R1 connected in series with the voltage regulator ZD1, a switching element, and a diode D3, wherein the switching element is connected between the resistor R1 and the anode of the diode D3, the cathode of the diode D3 is connected to the thin film capacitor C2, and the switching element is in an off state when the discharge circuit 23 does not operate.
The negative electrode of the voltage-stabilizing tube ZD1 is connected with the positive electrode of the electrolytic capacitor EC1, the positive electrode of the voltage-stabilizing tube ZD1 is connected with the resistor R1, and the voltage-stabilizing value of the voltage-stabilizing tube ZD1 is greater than the ripple voltage delta V existing on the film capacitor C2.
Since the thin-film capacitor C2 can maintain the operation of the control circuit after the external power supply is powered off, and the thin-film capacitor C2 is charged and discharged in each power supply cycle, a voltage ripple exists on the thin-film capacitor C2, the ripple voltage on the thin-film capacitor C2 is Δ V, and the voltage of the voltage ripple on the thin-film capacitor C2 at the valley bottom is Vinpk- Δ V. In the embodiment, the voltage value of the voltage regulator tube ZD1 is selected to be larger than delta V, so that the switching element can be always in a disconnected state in the normal working process of the power supply circuit, and the electrolytic capacitor EC1 cannot discharge.
Referring to fig. 3, in an embodiment of the present invention, the discharging circuit 23 includes a switch element and a diode D3 shared by the detecting circuit 22, when the external power supply is turned off, the voltage of the thin film capacitor C2 decreases, and when the detecting circuit 22 detects that the voltage difference between the thin film capacitor C2 and the electrolytic capacitor EC1 exceeds a preset value, the switch element is controlled to open, so that the electrolytic capacitor EC1 discharges to the thin film capacitor C2 through the discharging circuit 23.
In an embodiment of the present invention, the switching element is a transistor Q1 shown in fig. 3, an emitter of a transistor Q1 is connected to an anode of a diode D3, a collector of a transistor Q1 is connected to an anode of an electrolytic capacitor EC1, and a base of a transistor Q1 is connected to a resistor R1. Of course, other elements may be adopted as the switching element, and the embodiment of the present invention is not particularly limited thereto.
In the normal working process of the power supply circuit, the voltage value of the voltage regulator tube ZD1 is greater than delta V, so the base voltage of the triode (namely the switching element Q1) is always lower than the voltage of the film capacitor C2, the triode is always in a cut-off state, and the electrolytic capacitor EC1 cannot discharge electricity. When the external power supply is disconnected, the voltage of the film capacitor C2 is reduced, and when the detection circuit 22 detects that the voltage difference value between the film capacitor C2 and the electrolytic capacitor EC1 exceeds a preset value, the base voltage of the triode is higher than the voltage of the film capacitor C2, so that the conduction condition of the triode is met, and after the triode is conducted, the electrolytic capacitor EC1 starts to discharge to the film capacitor C2, so as to maintain the control chip or the MCU in the control circuit to work for a period of time.
The utility model discloses supply circuit is through increasing electrolytic capacitor EC1 in the second power supply branch road, has both guaranteed that second power supply branch road can also maintain control circuit and continue work a period after the external power outage, can effectively eliminate the problem that the main power circuit that electrolytic capacitor EC1 charges and discharges and lead to again does not satisfy the harmonic requirement. If the power supply circuit is applied to a dimming product, a user can effectively ensure that the control circuit of the dimming product continues to work when the brightness of the lamp is adjusted through the quick change-over switch, so that the dimming of the lamp is smoothly realized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principles of the present invention; such modifications and substitutions do not depart from the scope of the present invention.
Claims (8)
1. A power supply circuit is used for supplying power to a smart device with a main power loop and a control circuit, and comprises a first power supply branch and a second power supply branch connected in parallel with the first power supply branch, wherein the first power supply branch is configured to supply power to the main power loop; the second power supply branch is configured to supply power to the control circuit and comprises an electrolytic capacitor EC1, a charging circuit, a detection circuit, a discharging circuit and a film capacitor C2, wherein,
the charging circuit is provided with an input end and an output end, the input end of the charging circuit is connected with an external power supply, the output end of the charging circuit is connected with the anode of the electrolytic capacitor EC1, and the charging circuit is configured to charge the electrolytic capacitor EC1 and the thin film capacitor C2 when the external power supply is electrified;
the detection circuit is provided with two detection ends, one end of the detection end is connected between the charging circuit and the electrolytic capacitor EC1, the other end of the detection end is connected with one end of the thin-film capacitor C2, and the detection circuit is configured to detect the voltage difference value between the thin-film capacitor C2 and the electrolytic capacitor EC 1;
the discharge circuit is provided with an input end and an output end, the input end of the discharge circuit is connected with the anode of the electrolytic capacitor EC1, the output end of the discharge circuit is connected with one end of the thin-film capacitor C2, and power is supplied to the control circuit through the discharge circuit by the electrolytic capacitor EC1 when the detection circuit detects that the voltage difference value exceeds a preset value.
2. The power supply circuit of claim 1, further comprising:
and the rectifying module is provided with an input end and an output end, the input end of the rectifying module is connected with the external power supply, the output end of the rectifying module is respectively connected with the first power supply branch and the second power supply branch, the rectifying module is configured to rectify the external power supply and provide rectified current to the first power supply branch and the second power supply branch.
3. The power supply circuit of claim 2, wherein the charging circuit comprises a diode D1 and a diode D2,
the diode D1, the anode of which is connected to the output end of the rectifier module, and the cathode of which is connected to the anode of the diode D2 and one end of the thin-film capacitor C2, wherein the diode D1 is configured to prevent the thin-film capacitor C2 from discharging to the first power supply branch;
the diode D2 has its cathode connected to the anode of the electrolytic capacitor EC1, and the diode D2 is configured to prevent the electrolytic capacitor EC1 from discharging to the first power supply branch.
4. The power supply circuit according to claim 2, wherein the rectifying module comprises a rectifying bridge DB1,
the rectifier bridge DB1 has two input terminals and two output terminals, where the two input terminals are connected to the external power supply, rectifies the received current of the external power supply, and outputs the rectified current to the first power supply branch and the second power supply branch connected in parallel with the first power supply branch through the two output terminals.
5. The power supply circuit according to any one of claims 1-4, characterized in that the detection circuit comprises a voltage regulator tube ZD1, a resistor R1 connected in series with the voltage tube ZD1, a switching element, a diode D3,
the switch element is connected between the resistor R1 and the anode of the diode D3, the cathode of the diode D3 is connected with the thin-film capacitor C2, and the switch element is in an off state when the discharge circuit does not work;
the cathode of the voltage-stabilizing tube ZD1 is connected with the anode of the electrolytic capacitor EC1, the anode of the voltage-stabilizing tube ZD1 is connected with the resistor R1, and the voltage-stabilizing value of the voltage-stabilizing tube ZD1 is greater than the ripple voltage delta V existing on the thin-film capacitor C2.
6. The power supply circuit of claim 5,
the discharge circuit includes the switching element and a diode D3 in common with the detection circuit, and is configured to control the switching element to open to discharge the electrolytic capacitor EC1 to the thin film capacitor C2 when the detection circuit detects that the voltage difference value exceeds a preset value.
7. The power supply circuit according to claim 6, wherein the switching element comprises:
and a transistor Q1 having an emitter connected to the anode of the diode D3, a collector connected to the anode of the electrolytic capacitor EC1, and a base connected to the resistor R1.
8. The power supply circuit according to any one of claims 2-4, wherein said first power supply branch comprises a film capacitor C1 connected in parallel with said rectifying module and configured to supply power to said main power loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920304296.4U CN209823498U (en) | 2019-03-11 | 2019-03-11 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920304296.4U CN209823498U (en) | 2019-03-11 | 2019-03-11 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209823498U true CN209823498U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920304296.4U Withdrawn - After Issue CN209823498U (en) | 2019-03-11 | 2019-03-11 | Power supply circuit |
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| Country | Link |
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| CN (1) | CN209823498U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011397A (en) * | 2019-03-11 | 2019-07-12 | 欧普照明股份有限公司 | A kind of power supply circuit |
| WO2022236792A1 (en) * | 2021-05-14 | 2022-11-17 | 江苏金丰机电有限公司 | Circuit for implementing operation of battery lock by discharging capacitor after power-down of battery |
-
2019
- 2019-03-11 CN CN201920304296.4U patent/CN209823498U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011397A (en) * | 2019-03-11 | 2019-07-12 | 欧普照明股份有限公司 | A kind of power supply circuit |
| CN110011397B (en) * | 2019-03-11 | 2024-04-23 | 欧普照明股份有限公司 | Power supply circuit |
| WO2022236792A1 (en) * | 2021-05-14 | 2022-11-17 | 江苏金丰机电有限公司 | Circuit for implementing operation of battery lock by discharging capacitor after power-down of battery |
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