CN213959958U - Power supply circuit, switching power supply and digital power supply - Google Patents
Power supply circuit, switching power supply and digital power supply Download PDFInfo
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- CN213959958U CN213959958U CN202022654025.7U CN202022654025U CN213959958U CN 213959958 U CN213959958 U CN 213959958U CN 202022654025 U CN202022654025 U CN 202022654025U CN 213959958 U CN213959958 U CN 213959958U
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Abstract
The utility model relates to a digital power supply technical field, concretely relates to supply circuit, switching power supply and digital power supply, including power supply electronic circuit, transformer power supply electronic circuit and steady voltage sub-circuit. The power supply electronic circuit is used for independently supplying power to the power load when the external power supply is started; the transformer power supply electronic circuit is used for controlling the power supply electronic circuit to stop supplying power after detecting that the auxiliary voltage generated by the auxiliary winding of the external transformer reaches a preset working voltage so as to independently supply power to the load; the voltage stabilizing sub-circuit is used for converting the power supply voltage of the power supply sub-circuit and the transformer power supply sub-circuit into the power utilization voltage of the power utilization load. According to the technical scheme, an additional auxiliary power supply is not needed to be used for supplying power, the structure of the power supply circuit is simplified, and the use is more convenient.
Description
Technical Field
The utility model relates to a digital power supply technical field, concretely relates to power supply circuit, switching power supply and digital power supply.
Background
The digital power supply is a switch power supply using a programmable digital chip as a main control chip, can be used for starting a communication interface of a power supply, has a digital control function, can detect the operation parameters of the power supply, enables the use of the power supply to be more intelligent, and is a future development trend of the power supply industry.
However, the digital chip is powered differently than the analog chip. The digital chip power supply pin needs to be connected with low voltage, for example, 5V and 3.3V, so that the digital chip power supply pin can work, but the analog chip power supply pin needs to be connected with higher voltage, so that an additional power supply needs to be manufactured when the digital chip is used, a power supply circuit is more complex, and the use is inconvenient.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a power supply circuit, a switching power supply and a digital power supply to overcome the problem that an extra power supply is required to be manufactured when a digital chip is currently used, so that the power supply circuit is more complicated and inconvenient to use.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a power supply circuit comprises a power supply electronic circuit, a transformer power supply electronic circuit and a voltage stabilizing sub-circuit;
the power supply electronic circuit is used for connecting an external power supply as a power supply source, the transformer power supply electronic circuit is used for connecting an auxiliary winding of an external transformer as a power supply source, and the power supply electronic circuit is connected with the transformer power supply electronic circuit;
the power supply electronic circuit and the transformer electronic circuit are both also used for connecting an electric load, and the voltage stabilizing electronic circuit is used for being connected in parallel at two ends of the electric load;
the power supply electronic circuit is used for independently supplying power to the power load when the external power supply is started; the transformer power supply electronic circuit is used for controlling the power supply electronic circuit to stop supplying power after detecting that the auxiliary voltage generated by the auxiliary winding of the external transformer reaches a preset working voltage so as to independently supply power to the power load;
the voltage stabilizing sub-circuit is used for converting the power supply voltage of the power supply sub-circuit and the power supply voltage of the transformer power supply sub-circuit into the power utilization voltage of the power utilization load.
Further, in the above power supply circuit, the voltage regulator sub-circuit includes a first diode and a voltage regulator pin capacitor;
the cathode end of the first diode and the first end of the voltage-stabilizing pin capacitor are both used for being connected with the positive end of the electric load;
and the anode end of the first diode and the second end of the voltage-stabilizing pin capacitor are both used for connecting the negative end of the electric load and the negative end of the external power supply.
Further, the power supply circuit described above, the power supply electronic circuit includes a first power switch and a second power switch;
the first end of the first power switch, the second end of the first power switch and the first end of the second power switch are all used for being connected with the positive electrode end of the external power supply;
the third end of the first power switch is connected with the second end of the second power switch;
and the third end of the second power switch is respectively connected with the cathode end of the first diode and the first end of the voltage-stabilizing pin capacitor.
Further, in the power supply circuit described above, the power supply electronic circuit further includes a second diode and a third diode;
an anode end of the second diode is connected with a third end of the first power switch, and a cathode end of the second diode is connected with a first end of the first power switch;
and the anode end of the third diode is connected with the third end of the second power switch, and the cathode end of the third diode is connected with the first end of the second power switch.
Further, in the power supply circuit described above, the power supply electronic circuit further includes a first resistor and a second resistor;
the first end of the first power switch is connected with the positive end of the external power supply through the first resistor; the first end of the second power switch is connected with the positive end of the external power supply through the first resistor and the second resistor;
a first end of the first resistor is connected with a first end of the first power switch, and a second end of the first resistor is connected with a second end of the first power switch; and the first end of the second resistor is connected with the first end of the second power switch, and the second end of the second resistor is connected with the first end of the first power switch.
Further, in the above power supply circuit, the first power switch and the second power switch are both P-channel power switches;
the first ends of the first power switch and the second power switch are both grids, the second ends of the first power switch and the second power switch are both drains, and the third ends of the first power switch and the second power switch are both sources.
Further, in the above power supply circuit, the transformer power supply electronic circuit includes a first transistor and a second transistor;
the first end of the first triode and the second end of the first triode are both used for being connected with the positive end of the auxiliary winding of the external transformer, the first end of the first triode is also used for being connected with the negative end of the auxiliary winding of the external transformer and the negative end of the electric load respectively, and the third end of the first triode is connected with the first end of the second triode, the third end of the second triode and the positive end of the electric load respectively;
and the second end of the second triode is respectively connected with the first end of the first power switch and the first end of the second power switch, and the third end of the second triode is used for being connected with the negative end of the external power supply.
Further, in the power supply circuit described above, the transformer power supply circuit further includes a fourth diode;
the first end of the first triode and the second end of the first triode are connected with the positive end of the auxiliary winding of the external transformer through the fourth diode;
and the anode end of the fourth diode is used for being connected with the anode end of the auxiliary winding of the external transformer, and the cathode end of the fourth diode is respectively connected with the first end of the first triode and the second end of the first triode.
Further, in the above power supply circuit, the transformer power supply electronic circuit further includes a fifth diode;
the first end of the first triode is connected with the negative end of the electric load through the fifth diode;
and the anode end of the fifth diode is connected with the cathode end of the electric load, and the cathode end of the fifth diode is connected with the first end of the first triode.
Further, in the power supply circuit described above, the transformer power supply electronic circuit further includes a third resistor;
and the first end of the second triode is connected with the third end of the first triode through the third resistor.
Further, in the power supply circuit described above, the transformer power supply circuit further includes a fourth resistor;
and the first end of the first triode is connected with the cathode end of the fourth diode through the fourth resistor.
Further, in the above power supply circuit, the transformer power supply electronic circuit further includes a sixth diode;
the third end of the first triode is connected with the positive end of the electric load through the sixth diode;
and the anode end of the sixth diode is connected with the third end of the first triode, and the cathode end of the sixth diode is connected with the anode end of the electric load.
Further, in the power supply circuit, the first transistor and the second transistor are both NPN transistors;
the first ends of the first triode and the second triode are both bases, the second ends of the first triode and the second triode are both collectors, and the third ends of the first triode and the second triode are both emitters.
Further, the utility model also provides a switching power supply, including power supply module and above arbitrary the supply circuit.
Further, the utility model also provides a digital power supply, including digital chip and above arbitrary switching power supply.
The utility model discloses a power supply circuit, switching power supply and digital power supply, including power supply electronic circuit, transformer power supply electronic circuit and steady voltage sub-circuit. The power supply electronic circuit is used for independently supplying power to the power load when the external power supply is started; the transformer power supply electronic circuit is used for controlling the power supply electronic circuit to stop supplying power after detecting that the auxiliary voltage generated by the auxiliary winding of the external transformer reaches a preset working voltage so as to independently supply power to the load; the voltage stabilizing sub-circuit is used for converting the power supply voltage of the power supply sub-circuit and the transformer power supply sub-circuit into the power utilization voltage of the power utilization load. According to the technical scheme, an additional auxiliary power supply is not needed to be used for supplying power, the structure of the power supply circuit is simplified, and the use is more convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit block diagram provided by an embodiment of the power supply circuit of the present invention;
fig. 2 is a circuit diagram provided by an embodiment of the power supply circuit of the present invention;
fig. 3 is a circuit block diagram provided by an embodiment of the switching power supply of the present invention;
fig. 4 is a circuit block diagram provided by an embodiment of the digital power supply of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is a circuit block diagram provided by an embodiment of the power supply circuit of the present invention.
As shown in fig. 1, the power supply circuit of the present embodiment includes a power supply electronic circuit 11, a transformer power supply electronic circuit 12, and a voltage regulator electronic circuit 13. The power supply electronic circuit 11 is used for connecting an external power supply 21 as a power supply source, the transformer power supply electronic circuit 12 is used for connecting an auxiliary winding of an external transformer 22 as a power supply source, the power supply electronic circuit 11 is connected with the transformer power supply electronic circuit 12, both the power supply electronic circuit 11 and the transformer power supply electronic circuit 12 are also used for connecting an electric load 31, and the voltage stabilizing sub-circuit 13 is used for being connected in parallel at two ends of the electric load 31.
In one specific embodiment, the external power supply 21 is a 200V-850V high voltage power supply in the power module that powers the analog chip power pins. The auxiliary winding of the external transformer 22 is the auxiliary winding of the main power transformer in the power supply module.
Specifically, the power supply electronic circuit 11 is configured to supply power to the electrical load 31 alone when the external power supply 21 is started; the transformer power supply electronic circuit 12 is used for controlling the power supply electronic circuit 11 to stop supplying power after detecting that the auxiliary voltage generated by the auxiliary winding of the external transformer 22 reaches a preset working voltage, so as to independently supply power to the power load 31; the regulator sub-circuit 13 is configured to convert the supply voltages of the power supply sub-circuit 11 and the transformer supply sub-circuit 12 into the power consumption voltage of the power consumption load 31.
Based on a general utility model concept, the utility model discloses an embodiment is still provided to carry out the detailed description to supply circuit's circuit structure.
Fig. 2 is a circuit diagram provided by an embodiment of the power supply circuit of the present invention.
As shown in fig. 2, in the power supply circuit of the present embodiment, the regulator sub-circuit 13 includes a first diode D1 and a regulator pin capacitor C. The cathode end of the first diode D1 and the first end of the voltage-stabilizing pin capacitor C are both used for connecting the positive end of the electric load 31, and the anode end of the first diode D1 and the second end of the voltage-stabilizing pin capacitor C are both used for connecting the negative end of the electric load 31 and the negative end of the external power supply 21.
In fig. 2, Vin-is the negative terminal of the electric load 31 and the negative terminal of the external power supply 21, and Vcc is the positive terminal of the electric load 31.
In a specific embodiment, the first diode D1 is a zener diode, the first diode D1 is used to limit the voltage applied to the electric load 31, and the first diode D1 is connected in parallel to the electric load 31, and the voltage value is the same, so that the parameter of the first diode D1 can be determined according to the rated voltage value of the electric load 31, which is not limited in this embodiment. The voltage stabilization pin capacitor C is a power supply pin capacitor of the electric load 31, and can provide a stable power supply voltage for the electric load 31.
Further, in the power supply circuit of the present embodiment, the power supply electronic circuit 11 includes a first power switch T1 and a second power switch T2. Wherein, the first terminal of the first power switch T1, the second terminal of the first power switch T1, and the first terminal of the second power switch T2 are all used for connecting with the positive terminal of the external power source 21, and Vin + in fig. 2 is the positive terminal of the external power source 21; the third terminal of the first power switch T1 is connected with the second terminal of the second power switch T2; the third terminal of the second power switch T2 is connected to the cathode terminal of the first diode D1 and the first terminal of the voltage stabilization pin capacitor C, respectively.
Specifically, when the power module is powered on, the power supply electronic circuit 11 of the power supply circuit of the present embodiment can be powered on and operate immediately, but the power module cannot start normal operation immediately after the power module is powered on, and therefore, the transformer power supply electronic circuit 12 of the power supply circuit of the present embodiment cannot operate immediately. In the initial period of power-on, only the power supply electronic circuit 11 of the power supply circuit works, and referring to the circuit diagram shown in fig. 2, the working flow is as follows:
after the power is turned on, the first power switch T1 and the second power switch T2 obtain a driving voltage and a driving current, and the first power switch T1 and the second power switch T2 are turned on. The voltage generated by the current outputted from the positive terminal of the external power source 21 is connected to the two ends of the first diode D1 through the first power switch T1 and the second power switch T2, and since the first diode D1 is connected in parallel with the electric load 31, the electric load 31 can obtain the electric voltage under the adjustment of the first diode D1.
Further, in the power supply circuit of the present embodiment, the power supply electronic circuit 11 further includes a first resistor R1 and a second resistor R2, and the first terminal of the first power switch T1 is connected to the positive terminal of the external power supply 21 through the first resistor R1; a first terminal of the second power switch T2 is connected to the positive terminal of the external power supply 21 through a first resistor R1 and a second resistor R2. A first end of the first resistor R1 is connected to a first end of the first power switch T1, a second end of the first resistor R1 is connected to a second end of the first power switch T1, a first end of the second resistor R2 is connected to a first end of the second power switch T2, and a second end of the second resistor R2 is connected to a first end of the first power switch T1.
In this embodiment, the first power switch T1 obtains the driving voltage and the driving current through the first resistor R1, and the second power switch T2 obtains the driving voltage and the driving current through the first resistor R1 and the second resistor R2 connected in series.
Further, in the power supply circuit of the present embodiment, the power supply electronic circuit 11 further includes a second diode D2 and a third diode D3. An anode terminal of the second diode D2 is connected to the third terminal of the first power switch T1, and a cathode terminal of the second diode D2 is connected to the first terminal of the first power switch T1; an anode terminal of the third diode D3 is connected to the third terminal of the second power switch T2, and a cathode terminal of the third diode D3 is connected to the first terminal of the second power switch T2.
In a specific embodiment, the second diode D2 is a zener diode, the second diode D2 is configured to stabilize the voltage of the first power switch T1 within a driving voltage range, so as to ensure that the first power switch T1 can be normally turned on and cannot be damaged due to overvoltage, the zener value of the second diode D2 depends on the driving voltage of the first power switch T1, and can be selected according to actual needs, which is limited in this embodiment.
The third diode D3 is a voltage regulator, the third diode D3 is configured to stabilize the voltage of the second power switch T2 within a driving voltage range, so as to ensure that the second power switch T2 can be normally turned on and cannot be damaged by an overvoltage, the voltage regulator of the third diode D3 is selected according to the driving voltage of the second power switch T2, and the voltage regulator can be selected according to actual needs.
In one specific embodiment, the first power switch T1 and the second power switch T2 are both P-channel power switches, the first terminals of the first power switch T1 and the second power switch T2 are both gates, the second terminals of the first power switch T1 and the second power switch T2 are both drains, and the third terminals of the first power switch T1 and the second power switch T2 are both sources. The second diode D2 can stabilize the gate voltage of the first power switch T1 within a driving voltage range, and the third diode D3 can stabilize the gate voltage of the second power switch T2 within a driving voltage range.
It should be noted that, in this embodiment, it is not limited that the first power switch T1 and the second power switch T2 only can be P-channel power switches, and the first power switch T1 and the second power switch T2 can also be N-channel power switches, based on the contents described in this embodiment and in fig. 2, a person skilled in the art can obtain a circuit diagram of the first power switch T1 and the second power switch T2 that use N-channel power switches without expending creativity, and details are not described here.
In addition, the first power switch T1 and the second power switch T2 of the present embodiment may employ IGBT or MOSFET devices, or the like. However, the present invention is not limited to the IGBT device and the MOSFET device, and may be implemented by using other controllable switches.
Further, in the power supply circuit of the present embodiment, the transformer power supply circuit 12 includes a first transistor Q1 and a second transistor Q2. The first end of the first triode Q1 and the second end of the first triode Q1 are both used for connecting the positive end of the auxiliary winding of the external transformer 22, the first end of the first triode Q1 is also used for connecting the negative end of the auxiliary winding of the external transformer 22 and the negative end of the electric load 31, respectively, and the third end of the first triode Q1 is connected with the first end of the second triode Q2, the third end of the second triode Q2 and the positive end of the electric load 31, respectively; a third terminal of the second transistor Q2 is configured to be connected to a negative terminal of the external power source 21, and a second terminal of the second transistor Q2 is respectively connected to a first terminal of the first power switch T1 and a first terminal of the second power switch T2.
After a period of power-on, the main power transformer in the power module starts to work, and the transformer power supply electronic circuit 12 also starts to work, referring to the circuit diagram shown in fig. 2, the working flow of the transformer power supply electronic circuit 12 is as follows:
the auxiliary winding of the external transformer 22 can detect the auxiliary voltage, when the auxiliary voltage reaches the preset working voltage, the first transistor Q1 is turned on, the second transistor Q2 is turned on, and the first power switch T1 and the second power switch T2 are connected to the negative terminal of the external power supply 21, so that the current output from the positive terminal of the external power supply 21 flows back to the negative terminal of the external power supply 21 after passing through the power supply electronic circuit 11 of the embodiment, and the power supply for the electric load 31 is stopped. The third end of the first triode Q1 is connected with the positive end of the electric load 31, the third end of the second triode Q2 is connected with the negative end of the external power supply 21, a new power supply loop is formed, the transformer power supply electronic circuit 12 supplies power to the electric load 31, and the electric load 31 can obtain the electric voltage under the adjustment of the first diode D1 because the first diode D1 is connected with the electric load 31 in parallel.
Further, in the power supply circuit of the present embodiment, the transformer power supply circuit 12 further includes a fourth diode D4. A first terminal of the first transistor Q1 and a second terminal of the first transistor Q1 are connected to a positive terminal of the auxiliary winding of the external transformer 22 through a fourth diode D4; an anode terminal of the fourth diode D4 is connected to a positive terminal of the auxiliary winding of the external transformer 22, and a cathode terminal of the fourth diode D4 is connected to the first terminal of the first transistor Q1 and the second terminal of the first transistor Q1, respectively.
In one specific embodiment, the fourth diode D4 is a rectifier diode.
Further, in the power supply circuit of the present embodiment, the transformer power supply circuit 12 further includes a fifth diode D5, and the first terminal of the first transistor Q1 is connected to the negative terminal of the power load 31 through the fifth diode D5. An anode terminal of the fifth diode D5 is connected to the negative terminal of the electrical load 31, and a cathode terminal of the fifth diode D5 is connected to the first terminal of the first transistor Q1.
In one specific embodiment, the fifth diode D5 is a zener diode.
Further, in the power supply circuit of this embodiment, the transformer power supply circuit 12 further includes a third resistor R3, and the first terminal of the second transistor Q2 is connected to the third terminal of the first transistor Q1 through the third resistor R3. A first terminal of the third resistor R3 is connected to the third terminal of the first transistor Q1, and a second terminal of the third resistor R3 is connected to the first terminal of the second transistor Q2.
Further, in the power supply circuit of this embodiment, the transformer power supply circuit 12 further includes a fourth resistor R4, and the first terminal of the first transistor Q1 is connected to the cathode terminal of the fourth diode D4 through the fourth resistor R4. A first terminal of the fourth resistor R4 is connected to the first terminal of the first transistor Q1, and a second terminal of the fourth resistor R4 is connected to the cathode terminal of the fourth diode D4.
Further, in the power supply circuit of this embodiment, the transformer power supply circuit 12 further includes a sixth diode D6, and the third terminal of the first transistor Q1 is connected to the positive terminal of the consumer 31 through the sixth diode D6. An anode terminal of the sixth diode D6 is connected to the third terminal of the first transistor Q1, and a cathode terminal of the sixth diode D6 is connected to the positive terminal of the electrical load 31.
In one specific embodiment, the regulated voltage of the fifth diode D5 is about 2-3V less than the auxiliary voltage, such that the voltage at the third terminal of the first transistor Q1 is the regulated voltage of the fifth diode D5 minus the conduction voltage drop of the first transistor Q1, and the regulated voltage of the fifth diode D5 is determined by the voltage provided by the auxiliary voltage, but taking into account the conduction voltage drop of the first transistor Q1.
The fourth resistor R4 is used to limit the current flowing through the fifth diode D5 and protect the fifth diode D5. After the first triode Q1 is turned on, the voltage obtained by subtracting the conduction voltage drop of the first triode Q1 from the voltage value of the auxiliary voltage is connected to the first end of the second triode Q2 through the third resistor R3, the voltage of the first end of the second triode Q2 is consistent with the voltage value of the positive end of the electric load 31, the second triode Q2 is turned on, and the power supply electronic circuit 11 does not supply power to the electric load 31 any more, but supplies power to the electric load 31 through the sixth diode D6.
It should be noted that, when the power supply circuit of this embodiment is just powered on, the auxiliary voltage of the auxiliary winding of the external transformer 22 is unstable, and if the second transistor Q2 is turned on at this time, the operating state of the power supply circuit 11 is affected, so the sixth diode D6 is provided in this embodiment to prevent the unstable auxiliary voltage from causing the misconduction of the second transistor Q2.
In one specific embodiment, the first transistor Q1 and the second transistor Q2 are NPN transistors; the first ends of the first triode Q1 and the second triode Q2 are both bases, the second ends of the first triode Q1 and the second triode Q2 are both collectors, and the third ends of the first triode Q1 and the second triode Q2 are both emitters.
It should be noted that, in this embodiment, it is not limited that the first transistor Q1 and the second transistor Q2 only can be NPN transistors, and the first transistor Q1 and the second transistor Q2 can also be PNP transistors, and based on the contents recorded in this embodiment and in fig. 2, a circuit diagram of the first transistor Q1 and the second transistor Q2 that are PNP transistors can be obtained by those skilled in the art without any loss of creativity, and details are not described here.
The power supply circuit of the present embodiment includes a power supply electronic circuit 11, a transformer power supply electronic circuit 12, and a voltage regulator electronic circuit 13. The power supply electronic circuit 11 is used for independently supplying power to the electric load 31 when the external power supply 21 is started; the transformer power supply electronic circuit 12 is used for controlling the power supply electronic circuit 11 to stop supplying power after detecting that the auxiliary voltage generated by the auxiliary winding of the external transformer 22 reaches a preset working voltage, so as to independently supply power to the power load 31; the regulator sub-circuit 13 is configured to convert the supply voltages of the power supply sub-circuit 11 and the transformer supply sub-circuit 12 into the power consumption voltage of the power consumption load 31. According to the technical scheme of the embodiment, an additional auxiliary power supply is not needed to be used for supplying power, the structure of the power supply circuit is simplified, and the use is more convenient.
Based on a general utility model concept, this embodiment still provides a switching power supply.
Fig. 3 is a circuit block diagram provided by an embodiment of the switching power supply of the present invention.
As shown in fig. 3, the switching power supply of the present embodiment includes a power supply module 2 and the power supply circuit 1 described in the above embodiments. The power supply module 2 comprises an external power supply 21 and an external transformer 22, both the external power supply 21 and the external transformer 22 being connected to the power supply circuit 1.
Based on a general utility model concept, this embodiment still provides a digital power supply.
Fig. 4 is a circuit block diagram provided by an embodiment of the digital power supply of the present invention.
As shown in fig. 4, the digital power supply of the present embodiment includes a digital chip 41 and the switching power supply 42 of the above embodiment, and the digital chip 41 is connected to the switching power supply 42.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means at least two unless otherwise specified.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (15)
1. A power supply circuit is characterized by comprising a power supply electronic circuit, a transformer power supply electronic circuit and a voltage stabilizing sub-circuit;
the power supply electronic circuit is used for connecting an external power supply as a power supply source, the transformer power supply electronic circuit is used for connecting an auxiliary winding of an external transformer as a power supply source, and the power supply electronic circuit is connected with the transformer power supply electronic circuit;
the power supply electronic circuit and the transformer electronic circuit are both also used for connecting an electric load, and the voltage stabilizing electronic circuit is used for being connected in parallel at two ends of the electric load;
the power supply electronic circuit is used for independently supplying power to the power load when the external power supply is started; the transformer power supply electronic circuit is used for controlling the power supply electronic circuit to stop supplying power after detecting that the auxiliary voltage generated by the auxiliary winding of the external transformer reaches a preset working voltage so as to independently supply power to the power load;
the voltage stabilizing sub-circuit is used for converting the power supply voltage of the power supply sub-circuit and the power supply voltage of the transformer power supply sub-circuit into the power utilization voltage of the power utilization load.
2. The power supply circuit of claim 1, wherein the regulator sub-circuit comprises a first diode and a regulator pin capacitor;
the cathode end of the first diode and the first end of the voltage-stabilizing pin capacitor are both used for being connected with the positive end of the electric load;
and the anode end of the first diode and the second end of the voltage-stabilizing pin capacitor are both used for connecting the negative end of the electric load and the negative end of the external power supply.
3. The power supply circuit of claim 2, wherein the power supply sub-circuit comprises a first power switch and a second power switch;
the first end of the first power switch, the second end of the first power switch and the first end of the second power switch are all used for being connected with the positive electrode end of the external power supply;
the third end of the first power switch is connected with the second end of the second power switch;
and the third end of the second power switch is respectively connected with the cathode end of the first diode and the first end of the voltage-stabilizing pin capacitor.
4. The power supply circuit of claim 3, wherein the power supply electronic circuit further comprises a second diode and a third diode;
an anode end of the second diode is connected with a third end of the first power switch, and a cathode end of the second diode is connected with a first end of the first power switch;
and the anode end of the third diode is connected with the third end of the second power switch, and the cathode end of the third diode is connected with the first end of the second power switch.
5. The power supply circuit of claim 3, wherein the power supply electronic circuit further comprises a first resistor and a second resistor;
the first end of the first power switch is connected with the positive end of the external power supply through the first resistor; the first end of the second power switch is connected with the positive end of the external power supply through the first resistor and the second resistor;
a first end of the first resistor is connected with a first end of the first power switch, and a second end of the first resistor is connected with a second end of the first power switch; and the first end of the second resistor is connected with the first end of the second power switch, and the second end of the second resistor is connected with the first end of the first power switch.
6. The power supply circuit of claim 3, wherein the first power switch and the second power switch are both P-channel power switches;
the first ends of the first power switch and the second power switch are both grids, the second ends of the first power switch and the second power switch are both drains, and the third ends of the first power switch and the second power switch are both sources.
7. The power supply circuit of claim 3, wherein the transformer power supply electronic circuit comprises a first transistor and a second transistor;
the first end of the first triode and the second end of the first triode are both used for being connected with the positive end of the auxiliary winding of the external transformer, the first end of the first triode is also used for being connected with the negative end of the auxiliary winding of the external transformer and the negative end of the electric load respectively, and the third end of the first triode is connected with the first end of the second triode, the third end of the second triode and the positive end of the electric load respectively;
and the second end of the second triode is respectively connected with the first end of the first power switch and the first end of the second power switch, and the third end of the second triode is used for being connected with the negative end of the external power supply.
8. The power supply circuit of claim 7, wherein the transformer power supply circuit further comprises a fourth diode;
the first end of the first triode and the second end of the first triode are connected with the positive end of the auxiliary winding of the external transformer through the fourth diode;
and the anode end of the fourth diode is used for being connected with the anode end of the auxiliary winding of the external transformer, and the cathode end of the fourth diode is respectively connected with the first end of the first triode and the second end of the first triode.
9. The power supply circuit of claim 7, wherein the transformer supply electronic circuit further comprises a fifth diode;
the first end of the first triode is connected with the negative end of the electric load through the fifth diode;
and the anode end of the fifth diode is connected with the cathode end of the electric load, and the cathode end of the fifth diode is connected with the first end of the first triode.
10. The power supply circuit of claim 7, wherein the transformer supply electronic circuit further comprises a third resistor;
and the first end of the second triode is connected with the third end of the first triode through the third resistor.
11. The power supply circuit of claim 8, wherein the transformer power supply circuit further comprises a fourth resistor;
and the first end of the first triode is connected with the cathode end of the fourth diode through the fourth resistor.
12. The power supply circuit of claim 7, wherein the transformer supply electronic circuit further comprises a sixth diode;
the third end of the first triode is connected with the positive end of the electric load through the sixth diode;
and the anode end of the sixth diode is connected with the third end of the first triode, and the cathode end of the sixth diode is connected with the anode end of the electric load.
13. The power supply circuit of claim 7, wherein the first transistor and the second transistor are both NPN transistors;
the first ends of the first triode and the second triode are both bases, the second ends of the first triode and the second triode are both collectors, and the third ends of the first triode and the second triode are both emitters.
14. A switched mode power supply comprising a power supply module and a supply circuit as claimed in any one of claims 1 to 13.
15. A digital power supply comprising a digital chip and the switching power supply of claim 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022654025.7U CN213959958U (en) | 2020-11-16 | 2020-11-16 | Power supply circuit, switching power supply and digital power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022654025.7U CN213959958U (en) | 2020-11-16 | 2020-11-16 | Power supply circuit, switching power supply and digital power supply |
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| Publication Number | Publication Date |
|---|---|
| CN213959958U true CN213959958U (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022654025.7U Active CN213959958U (en) | 2020-11-16 | 2020-11-16 | Power supply circuit, switching power supply and digital power supply |
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| Country | Link |
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| CN (1) | CN213959958U (en) |
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