CN110011397B - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN110011397B CN110011397B CN201910181356.2A CN201910181356A CN110011397B CN 110011397 B CN110011397 B CN 110011397B CN 201910181356 A CN201910181356 A CN 201910181356A CN 110011397 B CN110011397 B CN 110011397B
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- power supply
- circuit
- electrolytic capacitor
- thin film
- diode
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- 239000003990 capacitor Substances 0.000 claims abstract description 127
- 239000010409 thin film Substances 0.000 claims abstract description 57
- 238000007599 discharging Methods 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 239000010408 film Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000005868 electrolysis reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005286 illumination 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
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention 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 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 thin film capacitor C2, wherein the charging circuit charges the electrolytic capacitor EC1 and the thin film capacitor C2 when an external power supply is powered on; the detection circuit detects the pressure difference value between the thin film capacitor C2 and the electrolytic capacitor EC 1; when the detection circuit detects that the differential pressure value exceeds a preset value, the discharge circuit discharges the electrolytic capacitor EC1 to the thin film capacitor C2 through the discharge circuit. The invention not only can maintain the control circuit to work for a period of time through the second power supply branch after the external power supply is powered off, but also can control the electrolytic capacitor EC1 not to charge and discharge in the normal working process of the power supply circuit, thereby solving the problem that the harmonic wave of the main power loop in the charging and discharging process of the electrolytic capacitor EC1 does not meet the requirement.
Description
Technical Field
The invention relates to the technical field of illumination, in particular to a power supply circuit.
Background
For some consumers, the harmonic current of the consumer needs to be limited when the power is high to the regulatory requirements, which may refer to IEC61000-3-2 or national standard GB17625.1. For example, when the power of the lamp product is greater than 25W, the harmonic requirements are strict, and the 3 rd harmonic is less than 0.3 x (lambda is the product power factor), the 5 th harmonic is less than 10%, the 7 th harmonic is less than 7%, the 9 th harmonic is less than 5%, and the above 11 th harmonic is less than 3%.
For many intelligent control products, it is often required that the control chip or MCU (Microcontroller Unit, micro control unit) etc. remain in operation for a period of time after power failure. In the prior art, electrolytic energy storage is generally used for maintaining continuous operation of a chip, but harmonic current of a product cannot meet the requirement of regulations due to an electrolytic charging and discharging process. For example, when the intelligent control product does not have an energy storage electrolysis circuit, the current waveform is as shown in fig. 1, the waveform is smoother and is close to a sine wave, and the harmonic current meets the regulation requirement. For another example, after adding the energy storage electrolysis circuit to the intelligent control product, the current waveform is shown in fig. 2, and a current peak appears at the top of the waveform due to the need of charging electrolysis at high voltage, so that the harmonic current no longer meets the requirement of regulations. The harmonics corresponding to the current waveforms of fig. 1 and 2, respectively, are shown in table 1.
| Conditions (conditions) | 3 Rd order harmonic | 5 Th harmonic | Harmonic of 7 times | Harmonic of 9 times | 11 Th harmonic | Results |
| Electroless plating | 17.26 | 2.55 | 2.77 | 2.56 | 1.33 | Qualified product |
| With electrolysis of | 14.57 | 3.95 | 2.86 | 1.16 | 3.18 | Failure to pass |
TABLE 1
Disclosure of Invention
The present invention has been made in view of the above problems, and has as its object to provide a power supply circuit which overcomes or at least partially solves the above problems.
According to an aspect of the invention, there is provided a power supply circuit for supplying power to a smart device having a main power loop and a control circuit, comprising a first power supply branch and a second power supply branch connected in parallel thereto, 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 thin film capacitor C2, wherein,
The charging circuit is provided with an input end and an output end, wherein 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 positive electrode 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 ends is connected between the charging circuit and the electrolytic capacitor EC1, the other end of the detection ends is connected with one end of the thin film capacitor C2, and the detection circuit is configured to detect the pressure difference value between the thin film capacitor C2 and the electrolytic capacitor EC 1;
The discharging circuit is provided with an input end and an output end, the input end of the discharging circuit is connected with the positive electrode of the electrolytic capacitor EC1, the output end of the discharging circuit is connected with one end of the thin film capacitor C2, and the discharging circuit is configured to supply power to the control circuit through the discharging circuit by the electrolytic capacitor EC1 when the detecting circuit detects that the differential pressure value exceeds a preset value.
Optionally, the power supply circuit further includes:
the rectification module is provided with an input end and an output end, the input end of the rectification module is connected with the external power supply, the output end of the rectification module is respectively connected with the first power supply branch and the second power supply branch, and the rectification 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 positive electrode of the diode D1 is connected with the output end of the rectifying module, the negative electrode of the diode D1 is connected with the positive electrode of the diode D2 and one end of the thin film capacitor C2, and the diode D1 is configured to prevent the thin film capacitor C2 from discharging to the first power supply branch;
the cathode of the diode D2 is 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 rectifying module comprises a rectifying bridge DB1,
The rectifier bridge DB1 is provided with two input ends and two output ends, wherein the two input ends of the rectifier bridge DB1 are connected with the external power supply, the received current of the external power supply is rectified, and the rectified current is respectively output to the first power supply branch circuit and the second power supply branch circuit which is connected in parallel with the first power supply branch circuit through the two output ends of the rectifier bridge DB 1.
Optionally, the detection circuit comprises a voltage stabilizing tube ZD1, a resistor R1 connected in series with the voltage stabilizing tube ZD1, a switching element and a diode D3,
The switching element is connected between the resistor R1 and the positive electrode of the diode D3, the negative electrode of the diode D3 is connected with the thin film capacitor C2, and the switching element is in an off state when the discharging circuit does not work;
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 larger than the ripple voltage DeltaV existing on the film capacitor C2.
Optionally, the discharging circuit includes the switching element and a diode D3 that are shared with the detecting circuit, and is configured to control the switching element to be turned on to discharge the electrolytic capacitor EC1 to the thin film capacitor C2 when the detecting circuit detects that the differential pressure value exceeds a preset value.
Optionally, the switching element includes:
and the emitter of the triode Q1 is connected with the anode of the diode D3, the collector of the triode Q is connected with the anode of the electrolytic capacitor EC1, and the base of the triode Q is connected with the resistor R1.
Optionally, the first power supply branch includes a thin film capacitor C1 connected in parallel with the rectifying module and configured to supply power to the main power loop.
The power supply circuit of the embodiment of the invention can be used for supplying power to intelligent equipment with a main power loop and a control circuit, and mainly comprises a first power supply branch circuit and a second power supply branch circuit connected in parallel with the first power supply branch circuit, wherein the first power supply branch circuit is used for supplying power to the main power loop, the second power supply branch circuit is used for supplying power to the control circuit, when an external power supply starts to electrify the power supply circuit, the charging circuit is used for charging the electrolytic capacitor EC1, when the external power supply is powered off, the voltage on the thin film capacitor C2 starts to decrease, and if the detection circuit detects that the voltage difference value between the voltage on the thin film capacitor C2 and the electrolytic capacitor EC1 exceeds a preset value, the electrolytic capacitor EC1 discharges to the thin film capacitor C2 through the discharging circuit. Therefore, the embodiment of the invention not only can maintain the control circuit to work for a period of time through the second power supply branch after the external power supply is powered off, but also can ensure that the electrolytic capacitor EC1 is not charged or discharged in the normal working process of the power supply circuit, and can maintain the charge in the electrolytic capacitor EC1 at the maximum value, thereby solving the problem that the harmonic wave of the main power loop caused in the charging and discharging process of the electrolytic capacitor EC1 does not meet the requirement.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read 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 designate like parts throughout the figures. In the drawings:
FIG. 1 shows a current waveform diagram of a prior art intelligent control product without a tank electrolysis circuit;
FIG. 2 shows a current waveform diagram of a prior art intelligent control product provided with an energy storage electrolysis circuit;
fig. 3 shows a schematic diagram of the structure of a power supply circuit according to an embodiment of the 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 above technical problems, the embodiments of the present invention provide a power supply circuit for supplying power to an intelligent device having a main power loop and a control circuit, where the intelligent device includes an intelligent lamp, an intelligent appliance, and the like, and the intelligent lamp may be a wireless bluetooth dimming product or a wired dimming product, and the like. Fig. 3 shows a schematic diagram of the structure of a power supply circuit according to an embodiment of the 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, wherein 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 employ a low-power control circuit including a control chip or an MCU (Microcontroller Unit, micro control unit) or the like.
The second power supply branch 2 further includes an electrolytic capacitor EC1, a charging circuit 21, a detecting circuit 22, a discharging circuit 23, and a thin film capacitor C2, and each part of the second power supply branch 2 is described below.
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 source (i.e., mains supply), and the output terminal is connected to the positive electrode of the electrolytic capacitor EC 1. The charging circuit 21 can charge the electrolytic capacitor EC1 and the thin film capacitor C2 when the external power supply 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 can detect the differential pressure value between the thin film capacitor C2 and the electrolytic capacitor 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 thin film capacitor C2, and when the detecting circuit 22 detects that the voltage difference value between the thin film capacitor C2 and the electrolytic capacitor EC1 exceeds a preset value, the electrolytic capacitor EC1 discharges to the control circuit through the discharging circuit 23, namely, the electrolytic capacitor EC1 supplies power to the control circuit. Naturally, during the process of discharging the electrolytic capacitor EC1 to the control circuit, the electrolytic capacitor C1 is also discharged to the thin film capacitor C2, and the thin film capacitor C2 further supplies power to the control circuit.
In this embodiment, both the negative electrode of the electrolytic capacitor EC1 and the other end of the thin film capacitor C2 are grounded.
According to the embodiment of the invention, the control circuit can be maintained to work for a period of time through the second power supply branch after the external power supply is powered off, and the electrolytic capacitor EC1 is not charged or discharged in the normal working process of the power supply circuit, so that the charge in the electrolytic capacitor EC1 can be maintained at the maximum value, the harmonic wave of the main power loop is not influenced, and the problem that the harmonic wave of the main power loop in the charging and discharging process of the electrolytic capacitor EC1 does not meet the requirement is solved.
In an embodiment of the present invention, a capacitor with a smaller capacity, such as a thin film capacitor C1 in fig. 3, may be used in the first power supply branch 1, where the thin film capacitor C1 is connected in parallel with the rectifying module and is used to supply power to the main power loop, so that the main power loop meets the high power factor PF.
In an embodiment of the present invention, the power supply circuit further includes a rectifying module, where the rectifying module has an input end and an output end, the input end of the rectifying module is connected to an external power source, the output end of the rectifying module is connected to the first power supply branch 1 and the second power supply branch 2, and the rectifying module is configured to rectify the external power source and provide the rectified current to the first power supply branch 1 and the second power supply branch 2.
In an alternative implementation of the present invention, the rectifying module may employ a rectifying bridge DB1 shown in fig. 3, where the rectifying bridge DB1 has two input terminals and two output terminals, and the two input terminals are connected to an external power source, and rectify the received current of the external power source, so as to output the rectified current to the first power supply branch 1 and the second power supply branch 2 connected in parallel thereto through the two output terminals thereof, respectively.
With continued reference to fig. 3, in an embodiment of the present invention, the charging circuit 21 includes a diode D1 and a diode D2, where an anode of the diode D1 is connected to an output terminal of the rectifying module, and a cathode of the diode D2 is connected to an end of the anode of the diode D2 and the thin film capacitor C2 that is not grounded. The negative electrode of the diode D2 is connected to the positive electrode of the electrolytic capacitor EC 1. When the external power supply is powered on for the first time, the bus charges the electrolytic capacitor EC1 and the thin film capacitor C2 through the diode D1 and the diode D2, and after the charging is completed, the voltage on the electrolytic capacitor EC1 is the peak Vinpk of the input voltage (i.e. the external power supply voltage), which is about 1.414×vin (input voltage).
In this embodiment, the diode D1 is used to effectively prevent the thin film capacitor C2 from discharging to the first power supply branch 1, i.e. prevent the thin film capacitor C2 from discharging to the main power loop. The diode D2 is used to effectively prevent the electrolytic capacitor EC1 from discharging to the first power supply branch 1, i.e. to prevent the electrolytic capacitor EC1 from discharging to the main power circuit.
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, where 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 is not in operation.
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 larger than the ripple voltage DeltaV existing on the film capacitor C2.
Because the thin film capacitor C2 can maintain the control circuit to work after the external power supply is powered off, and the thin film capacitor C2 can be charged and discharged in each power supply period, voltage ripple exists on the thin film capacitor C2, ripple voltage on the thin film capacitor C2 is set to be DeltaV, and voltage of the voltage ripple on the thin film capacitor C2 when the voltage ripple on the thin film capacitor C2 is at the valley bottom is Vinpk-DeltaV. In this embodiment, by selecting the voltage value of the voltage regulator ZD1 to be greater than Δv, it can be ensured that the switching element is always in an off state during normal operation of the power supply circuit, and the electrolytic capacitor EC1 will not discharge.
Referring to fig. 3, in an embodiment of the present invention, the discharging circuit 23 includes a switching element and a diode D3 that are shared with the detecting circuit 22, when the voltage of the thin film capacitor C2 decreases after the external power is turned off, 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 switching element is controlled to be turned on, 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 the transistor Q1 is connected to an anode of the diode D3, a collector of the transistor Q1 is connected to an anode of the electrolytic capacitor EC1, and a base of the transistor Q1 is connected to the resistor R1. Of course, other elements may be used as the switching element, and the embodiment of the present invention is not particularly limited thereto.
In the normal operation process of the power supply circuit, the voltage value of the voltage stabilizing tube ZD1 is larger than Δv, so that the voltage of the base electrode of the triode (i.e. the switching element Q1) is always lower than the voltage on the thin film capacitor C2, and the triode is always in a cut-off state, so that the electrolytic capacitor EC1 can not discharge. When the voltage of the thin film capacitor C2 is reduced after the external power supply is disconnected, and the detection circuit 22 detects that the voltage difference value between the thin film capacitor C2 and the electrolytic capacitor EC1 exceeds a preset value, the base voltage of the triode is higher than the voltage on the thin film capacitor C2, so that the conduction condition of the triode is met, and the electrolytic capacitor EC1 begins to discharge to the thin film capacitor C2 after the triode is conducted, so that a control chip or an MCU in the control circuit is maintained to work for a period of time.
According to the power supply circuit provided by the embodiment of the invention, by adding the electrolytic capacitor EC1 in the second power supply branch circuit, the second power supply branch circuit can be ensured to keep the control circuit continuously working for a period of time after the external power supply is powered off, and the problem that the main power circuit does not meet the harmonic requirement due to the charge and discharge of the electrolytic capacitor EC1 can be effectively solved. If the power supply circuit is applied to a dimming product, a user can effectively ensure that a control circuit of the dimming product continues to work when the brightness of the lamp is regulated by the fast change-over switch, so that the dimming of the lamp is smoothly realized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all technical features thereof can be replaced by others within the spirit and principle of the present invention; such modifications and substitutions do not depart from the scope of the invention.
Claims (6)
1. A power supply circuit for powering a smart device having a main power loop and a control circuit, comprising a first power supply branch and a second power supply branch connected in parallel thereto, 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, a thin film capacitor C2 and a rectifying module, wherein,
The charging circuit is provided with an input end and an output end, wherein 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 positive electrode 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 ends is connected between the charging circuit and the electrolytic capacitor EC1, the other end of the detection ends is connected with one end of the thin film capacitor C2, and the detection circuit is configured to detect the pressure difference value between the thin film capacitor C2 and the electrolytic capacitor EC 1;
the discharging circuit is provided with an input end and an output end, the input end of the discharging circuit is connected with the positive electrode of the electrolytic capacitor EC1, the output end of the discharging circuit is connected with one end of the thin film capacitor C2, and the discharging circuit is configured to supply power to the control circuit through the discharging circuit by the electrolytic capacitor EC1 when the detecting circuit detects that the differential pressure value exceeds a preset value;
The rectification module is provided with an input end and an output end, the input end of the rectification module is connected with the external power supply, the output end of the rectification module is respectively connected with the first power supply branch and the second power supply branch, and the rectification 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;
the charging circuit includes a diode D1 and a diode D2,
The positive electrode of the diode D1 is connected with the output end of the rectifying module, the negative electrode of the diode D1 is connected with the positive electrode of the diode D2 and one end of the thin film capacitor C2, and the diode D1 is configured to prevent the thin film capacitor C2 from discharging to the first power supply branch;
the cathode of the diode D2 is 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.
2. The power supply circuit of claim 1, wherein the rectifying module comprises a rectifying bridge DB1,
The rectifier bridge DB1 is provided with two input ends and two output ends, wherein the two input ends of the rectifier bridge DB1 are connected with the external power supply, the received current of the external power supply is rectified, and the rectified current is respectively output to the first power supply branch circuit and the second power supply branch circuit which is connected in parallel with the first power supply branch circuit through the two output ends of the rectifier bridge DB 1.
3. The power supply circuit according to claim 1 or 2, wherein the detection circuit includes a regulator tube ZD1, a resistor R1 connected in series with the regulator tube ZD1, a switching element, a diode D3,
The switching element is connected between the resistor R1 and the positive electrode of the diode D3, the negative electrode of the diode D3 is connected with the thin film capacitor C2, and the switching element is in an off state when the discharging circuit does not work;
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 larger than the ripple voltage DeltaV existing on the film capacitor C2.
4. The power supply circuit according to claim 3, wherein,
The discharging circuit includes the switching element and a diode D3 that are shared with the detecting circuit, and is configured to control the switching element to be turned on to discharge the electrolytic capacitor EC1 to the thin film capacitor C2 when the detecting circuit detects that the differential pressure value exceeds a preset value.
5. The power supply circuit of claim 4, wherein the switching element comprises:
and the emitter of the triode Q1 is connected with the anode of the diode D3, the collector of the triode Q is connected with the anode of the electrolytic capacitor EC1, and the base of the triode Q is connected with the resistor R1.
6. The power supply circuit according to claim 1 or 2, wherein the first power supply branch comprises a thin film capacitor C1, in parallel with the rectifying module, configured to supply power to the main power loop.
Priority Applications (1)
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| CN201910181356.2A CN110011397B (en) | 2019-03-11 | 2019-03-11 | Power supply circuit |
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| CN110011397B true CN110011397B (en) | 2024-04-23 |
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