CN209767382U - Meter power supply circuit capable of improving loading capacity - Google Patents
Meter power supply circuit capable of improving loading capacity Download PDFInfo
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- CN209767382U CN209767382U CN201920720314.7U CN201920720314U CN209767382U CN 209767382 U CN209767382 U CN 209767382U CN 201920720314 U CN201920720314 U CN 201920720314U CN 209767382 U CN209767382 U CN 209767382U
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Abstract
The utility model provides a can improve table meter power supply circuit of on-load ability, including first power, the second power, the third power, the fourth power, keep apart the inductance, the switch, rectifier diode, first electric capacity, the second electric capacity, the third electric capacity, voltage regulator device, keep apart behind 2 series switches of primary coil's of inductance pin and be connected with first power electricity, voltage regulator device's input is connected with the second power electricity, the output is connected with the third power electricity, the earthing terminal is connected with main circuit ground electricity, second electric capacity electric connection is between voltage regulator device's input and earthing terminal, its characterized in that: the pin 1 of the primary coil of the isolation inductor is electrically connected with the input end of the voltage stabilizing device, the voltage stabilizing device further comprises a fly-wheel diode, the cathode of the fly-wheel diode is electrically connected with the pin 2 of the primary coil of the isolation inductor, and the anode of the fly-wheel diode is electrically connected with the main circuit. The meter power supply circuit capable of improving the loading capacity can still enable near infrared normal communication when the power supply is limited under the low-voltage condition.
Description
Technical Field
The utility model relates to the technical field of circuits, concretely relates to can improve table meter power supply circuit of area load ability.
Background
As shown in fig. 1, a power supply circuit of an existing part of overseas prepaid meter includes a first power supply VCC1, a second power supply VCC2, a third power supply VCC3, a fourth power supply VCC4, an isolation inductor L1, a switch SW1, a rectifying diode VD1, a bidirectional transient suppression diode VD2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a voltage regulator N1, where the bidirectional transient suppression diode VD2 is electrically connected between a pin 1 and a pin 2 of a primary winding of an isolation inductor L1, a pin 2 of the primary winding of the isolation inductor L1 is further connected in series with a switch SW1 and then electrically connected to a first power supply VCC1, a pin 1 of the primary winding is further electrically connected to a main ground MGND, a pin 3 of a secondary winding of the isolation inductor L1 is electrically connected to an anode of a rectifying diode VD1, a cathode of the rectifying diode VD1 is electrically connected to one end of the first capacitor, and the other end of the first capacitor is electrically connected to a pin 4 of the secondary winding, the pin 4 of the secondary side coil is further electrically connected to an auxiliary circuit ground FGND, the cathode of the rectifier diode VD1 is further electrically connected to a fourth power source VCC4, the pin 1 of the primary side coil of the isolation inductor L1 and the pin 4 of the secondary side coil are dotted terminals, the input terminal of the voltage regulator device N1 is electrically connected to the second power source VCC2, the output terminal of the voltage regulator device N1 is electrically connected to a third power source VCC3, the ground terminal of the voltage regulator device N1 is electrically connected to the main circuit ground MGND, the second capacitor C2 is electrically connected between the input terminal of the voltage regulator device N1 and the ground terminal, and the third capacitor C3 is electrically connected between the output terminal of the voltage regulator device N1 and the ground terminal.
In the figure, a first power supply VCC1 and a second power supply VCC2 are provided by a front-end dc power supply; the third power supply VCC3 is a power supply regulated by a voltage regulator N1, and is generally used for circuits such as chips, near infrared communication and the like; the fourth power VCC4 is an output power isolated by the isolation inductor L1, and the isolation inductor L1 may adopt a common mode inductor, and is generally used for a weak current terminal, such as an MBUS interface. The switch SW1 can be a switching device such as a MOS transistor or a triode, the switch SW1 can be turned on and off at a certain frequency to convert direct current into an effect similar to alternating current, so that the common mode inductor L1 can work, the energy of the first power source VCC1 is transmitted to the fourth power source VCC4 through the common mode inductor L1, during the period that the switch SW1 is turned on, the current on the common mode inductor L1 can freewheel through the bidirectional transient suppression diode VD2, and the power source energy is consumed instantly due to the fact that the voltage drop of the VD2 is large.
however, the prior meter power supply circuit has the following technical problems: the second power VCC2 is regulated to the third power VCC3 through voltage regulator N1 for chip and near infrared communication, and during low voltage communication, near infrared communication electric current can reach 20mA in the twinkling of an eye, and when the power was restricted, VCC2 voltage can be pulled down, leads to VCC3 voltage to reduce, finally makes the unable normal communication of near infrared.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the power supply circuit of the meter can improve the loading capacity and still enable the near infrared normal communication when the power supply is limited under the condition of low voltage.
The technical solution of the utility model is that: a meter power circuit capable of improving the load capacity comprises a first power supply, a second power supply, a third power supply, a fourth power supply, an isolation inductor, a switch, a rectifier diode, a first capacitor, a second capacitor, a third capacitor and a voltage stabilizing device, wherein a pin 2 of a primary coil of the isolation inductor is connected with the first power supply after being connected with the switch in series and then is electrically connected with the first power supply, a pin 3 of a secondary coil of the isolation inductor is electrically connected with an anode of the rectifier diode, a cathode of the rectifier diode is electrically connected with one end of the first capacitor, the other end of the first capacitor is electrically connected to a pin 4 of the secondary coil, the pin 4 of the secondary coil is also electrically connected to an auxiliary circuit ground, a cathode of the rectifier diode is also electrically connected with the fourth power supply, the pin 1 of the primary coil of the isolation inductor and the pin 4 of the secondary coil are ends with the same, the input of regulator device is connected with the second power electricity, the output of regulator device is connected with the third power electricity, the earthing terminal and the main circuit ground electricity of regulator device are connected, second electric capacity electricity is connected between the input of regulator device and earthing terminal, third electric capacity electricity is connected between the output of regulator device and earthing terminal, its characterized in that: the primary side coil of the isolation inductor is electrically connected with the input end of the voltage stabilizing device through a pin 1, the isolation inductor further comprises a fly-wheel diode, the cathode of the fly-wheel diode is electrically connected with the pin 2 of the primary side coil of the isolation inductor, and the anode of the fly-wheel diode is electrically connected with the main circuit.
After the structure is adopted, the utility model has the advantages of it is following:
When the switch of the meter power circuit capable of improving the loading capacity of the utility model is closed, one part of the common mode inductor transmits energy to the fourth power supply, and the other part charges the second capacitor, so that the loading capacity of the third power supply can be directly improved; when the switch is turned on, due to the existence of the freewheeling diode, the energy stored on the common-mode inductor returns to the pin 2 of the common-mode inductor through the pin 1 via the second capacitor and the freewheeling diode, and because the voltage drop of the freewheeling diode is very small, the energy cannot be consumed immediately by the freewheeling diode, but can continuously circulate to continuously provide energy for other devices, wherein the energy comprises the step of charging the second capacitor; therefore, when the power supply is limited under the low-voltage condition, the front-end power supply or the follow current loop can continuously charge the second capacitor all the time no matter the switch is in an open state or a closed state, so that the second capacitor can continuously keep certain energy, the loading capacity of the third power supply is improved, and the normal near-infrared communication is ensured; and the freewheeling diode is used for replacing the bidirectional transient suppression diode in the conventional circuit, so that the cost is reduced.
Preferably, the isolation inductor is a common mode inductor. The common-mode inductance has better electromagnetic interference resistance and better filtering effect.
Preferably, the switch is a MOS transistor. The MOS tube has small conduction resistance and high efficiency.
Preferably, the switch is a triode. The triode has good overvoltage resistance and static resistance and good environmental reliability.
Preferably, the type of the rectifier diode is IN 4007. The rectifier diode of the type has stable and reliable performance.
preferably, the freewheeling diode is a fast recovery diode. The fast recovery diode has short reverse recovery time, low forward voltage drop and high voltage resistance.
Preferably, the first capacitor is a non-polar capacitor. The non-polar capacitor can meet the requirement and has low cost.
Preferably, the second capacitor is a non-polar capacitor. The non-polar capacitor can meet the requirement and has low cost.
Preferably, the third capacitor is a non-polar capacitor. The non-polar capacitor can meet the requirement and has low cost.
Preferably, the voltage stabilizing device is a low dropout linear regulator. The low-dropout linear regulator has low cost, low noise, small quiescent current and less external required elements.
Description of the drawings:
FIG. 1 is a schematic diagram of a prior art power supply circuit for a meter;
FIG. 2 is a schematic diagram of a power supply circuit of the meter for improving the loading capacity of the present invention;
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments.
Example (b):
A meter power supply circuit capable of improving the loading capacity comprises a first power supply VCC1, a second power supply VCC2, a third power supply VCC3, a fourth power supply VCC4, an isolation inductor L1, a switch SW1, a rectifying diode VD1, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a voltage stabilizing device N1, wherein a pin 2 of a primary coil of the isolation inductor L1 is connected with a switch SW1 in series and then electrically connected with a first power supply VCC1, a pin 3 of a secondary coil of the isolation inductor L1 is electrically connected with an anode of the rectifying diode VD1, a cathode of the rectifying diode VD1 is electrically connected with one end of a first capacitor C1, the other end of the first capacitor C1 is electrically connected with a pin 4 of a secondary coil, a pin 4 of the secondary coil is also electrically connected with a secondary circuit ground FGND, a cathode of the rectifying diode VD1 is also electrically connected with a fourth power supply 4, a pin 1 of the isolation inductor L1 and a secondary end of the same name as the primary coil are also electrically connected with the secondary end FGND 4, the input end of the voltage stabilizing device N1 is electrically connected with a second power supply VCC2, the output end of the voltage stabilizing device N1 is electrically connected with a third power supply VCC3, the ground terminal of the voltage stabilizing device N1 is electrically connected with a main circuit ground MGND, the second capacitor C2 is electrically connected between the input end of the voltage stabilizing device N1 and the ground terminal, the third capacitor C3 is electrically connected between the output end of the voltage stabilizing device N1 and the ground terminal, the pin 1 of the primary coil of the isolation inductor L1 is electrically connected with the input end of the voltage stabilizing device N1, the voltage stabilizing device further comprises a freewheeling diode VD2, the cathode of the freewheeling diode VD2 is electrically connected with the pin 2 of the primary coil of the isolation inductor L1, and the anode of the freewheeling diode VD2 is electrically connected with the main circuit ground MGND.
The isolation inductor L1 is a transformer or a common mode inductor; the switch SW1 is an MOS tube or a triode; the type of the rectifying diode VD1 is IN 4007; the freewheeling diode VD2 is a switch diode or a fast recovery diode; the first capacitor C1, the second capacitor C2 and the third capacitor C3 are all nonpolar capacitors; the voltage stabilizing device N1 is a DC-DC chip or a low-voltage drop linear voltage stabilizer.
The utility model discloses can improve the meter power supply circuit of area load ability when switch SW1 is closed, common mode inductance L1 partly to fourth power VCC4 transmission energy, partly to second electric capacity C2 charge, can directly improve the area load ability of third power VCC 3; when the switch SW1 is turned on, due to the existence of the freewheeling diode VD2, the energy stored in the common mode inductor L1 is returned to the pin 2 of the common mode inductor L1 through the pin 1 via the second capacitor C2 and the freewheeling diode VD2, and because the voltage drop of the freewheeling diode VD2 is small, the energy is not consumed immediately by the freewheeling diode VD2, but can continuously circulate to supply energy to other devices, including charging the second capacitor C2; therefore, when the power supply is limited under the low-voltage condition, no matter the switch SW1 is in the open state or the closed state, the front-end power supply or the follow current loop can continuously charge the second capacitor C2 all the time, so that the second capacitor C2 can continuously keep certain energy, the loading capacity of the third power supply VCC3 is improved, and the normal near-infrared communication is ensured; and the freewheeling diode VD2 is used to replace the bidirectional transient suppression diode in the conventional circuit, so that the cost is reduced.
Claims (10)
1. a meter power supply circuit capable of improving loading capacity comprises a first power supply (VCC1), a second power supply (VCC2), a third power supply (VCC3), a fourth power supply (VCC4), an isolation inductor (L1), a switch (SW1), a rectifying diode (VD1), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3) and a voltage stabilizing device (N1), wherein a pin 2 of a primary side coil of the isolation inductor (L1) is electrically connected with the first power supply (VCC1) after being connected with a switch (SW1) in series, a pin 3 of a secondary side coil of the isolation inductor (L1) is electrically connected with an anode of the rectifying diode (VD1), a cathode of the rectifying diode (VD1) is electrically connected with one end of a first capacitor (C1), the other end of the first capacitor (C1) is electrically connected with a pin 4 of the secondary side coil, the pin 4 of the secondary side coil is also electrically connected with an auxiliary circuit ground (VCC4), and a cathode of the rectifying diode (ND 4) is electrically connected with a fourth rectifying diode (ND 4), the isolation inductor (L1) has a primary coil pin 1 and a secondary coil pin 4 which are homonymous terminals, the input terminal of the voltage regulator device (N1) is electrically connected with the second power supply (VCC2), the output terminal of the voltage regulator device (N1) is electrically connected with the third power supply (VCC3), the ground terminal of the voltage regulator device (N1) is electrically connected with the Main Ground (MGND), the second capacitor (C2) is electrically connected between the input terminal of the voltage regulator device (N1) and the ground terminal, and the third capacitor (C3) is electrically connected between the output terminal of the voltage regulator device (N1) and the ground terminal, and is characterized in that: the pin 1 of the primary coil of the isolation inductor (L1) is electrically connected with the input end of a voltage stabilizing device (N1), the isolation inductor further comprises a freewheeling diode (VD2), the cathode of the freewheeling diode (VD2) is electrically connected with the pin 2 of the primary coil of the isolation inductor (L1), and the anode of the freewheeling diode (VD2) is electrically connected with the main circuit ground (MGND).
2. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the isolation inductor (L1) is a common mode inductor.
3. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the switch (SW1) is a MOS tube.
4. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the switch (SW1) is a triode.
5. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the model of the rectifying diode (VD1) is IN 4007.
6. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the freewheeling diode (VD2) is a fast recovery diode.
7. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the first capacitance (C1) is a non-polar capacitance.
8. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the second capacitor (C2) is a non-polar capacitor.
9. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the third capacitor (C3) is a non-polar capacitor.
10. A power supply circuit for a meter with improved on-load capability as claimed in claim 1, wherein: the voltage regulator device (N1) is a low dropout linear regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920720314.7U CN209767382U (en) | 2019-05-20 | 2019-05-20 | Meter power supply circuit capable of improving loading capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920720314.7U CN209767382U (en) | 2019-05-20 | 2019-05-20 | Meter power supply circuit capable of improving loading capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209767382U true CN209767382U (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920720314.7U Active CN209767382U (en) | 2019-05-20 | 2019-05-20 | Meter power supply circuit capable of improving loading capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209767382U (en) |
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2019
- 2019-05-20 CN CN201920720314.7U patent/CN209767382U/en active Active
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