CN114268225A - Voltage regulation circuit and method of switching power supply and power supply system - Google Patents
Voltage regulation circuit and method of switching power supply and power supply system Download PDFInfo
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Abstract
The embodiment discloses a voltage regulation circuit, a method and a power supply system of a switching power supply, wherein the switching power supply is provided with a path of voltage-stabilizing output end and at least one path of non-voltage-stabilizing output end, and the voltage regulation circuit comprises: the first dummy load circuit and the second dummy load circuit are arranged between the non-voltage-stabilizing output end and the grounding end in parallel; the first dummy load circuit comprises a first resistor; the second dummy load circuit is a motor driving circuit and is used for stabilizing the voltage of the non-voltage-stabilizing output end under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value.
Description
Technical Field
The present disclosure relates to the field of switching power supplies, and in particular, to a voltage regulation circuit, a voltage regulation method, and a power supply system for a switching power supply.
Background
With the development of electronic technology, the conventional linear power supply is gradually replaced by a switching power supply having a switching characteristic. With the evolution of application environment, the switching power supply with single output is often difficult to meet the application requirements, so that the switching power supply with multiple outputs is developed.
In the related art, the multi-output switching power supply usually performs voltage stabilization control based on one output voltage, that is, the feedback loop only samples one output voltage as feedback to realize voltage stabilization output of the voltage stabilization output terminal, and other non-voltage stabilization output terminals are realized by a transformer. Since other non-voltage-stabilized output terminals do not participate in the closed-loop feedback, the voltage-stabilized output cannot be realized. Generally, when the regulated output terminal is fully loaded and the unregulated output terminal is lightly loaded, the unregulated output terminal voltage will rise due to the influence of the cross regulation rate. In order to avoid the voltage at the unregulated output terminal from generating large fluctuation due to the change of the load size, a dummy load is usually added at the unregulated output terminal, and in the design of the dummy load, if the load current is designed to be too small, the voltage regulation capability of the unregulated output terminal is reduced, and if the load current is designed to be too large, the standby power consumption is large.
Disclosure of Invention
The embodiment of the application provides a voltage adjusting circuit, a voltage adjusting method and a power supply system of a switching power supply, which can solve the contradiction between the voltage stabilizing design and the standby power consumption of an unstable voltage output end of the switching power supply.
The embodiment of the application provides a switching power supply's voltage regulation circuit, switching power supply has voltage stabilization output and at least one kind of non-voltage stabilization output all the way, voltage regulation circuit includes:
the first dummy load circuit and the second dummy load circuit are arranged between the non-voltage-stabilizing output end and the grounding end in parallel;
the first dummy load circuit comprises a first resistor; the second dummy load circuit is a motor driving circuit and is used for stabilizing the voltage of the non-voltage-stabilizing output end under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value.
In some embodiments, the voltage regulation circuit further comprises a controller coupled to the second dummy load circuit;
the controller is used for obtaining the voltage at two ends of the first resistor, and increasing the load current of the motor driving circuit under the condition that the voltage at two ends of the first resistor is larger than or equal to a voltage threshold value.
In some embodiments, the amount of increase in load current of the motor drive circuit is positively correlated with a voltage difference value representing a difference of the voltage across the first resistor minus a voltage threshold.
In some embodiments, the motor drive circuit is a three-phase motor drive circuit;
the controller is specifically configured to increase a duty cycle of any corresponding pulse width adjustment signal in the three-phase motor driving circuit when a voltage across the first resistor is greater than or equal to a voltage threshold.
In some embodiments, the amount of increase in the duty cycle of the pulse width adjustment signal is positively correlated to a voltage difference value representing the difference between the voltage across the first resistor minus a voltage threshold.
In some embodiments, the voltage adjustment circuit further comprises a voltage sampling circuit for sampling a voltage across the first resistor, and the controller is connected to the voltage sampling circuit.
The embodiment of the application also provides a power supply system, which comprises a switching power supply and any one of the voltage regulating circuits.
In some embodiments, the motor drive circuit is a drive circuit of a fresh air motor.
The embodiment of the present application further provides a voltage adjustment method, which is applied to a voltage adjustment circuit of a switching power supply, where the switching power supply has one path of a voltage-stabilized output terminal and at least one path of an unregulated output terminal, and the voltage adjustment circuit includes: the first dummy load circuit and the second dummy load circuit are arranged between the non-voltage-stabilizing output end and the grounding end in parallel; the first dummy load circuit comprises a first resistor; the second dummy load circuit is a motor driving circuit; the method comprises the following steps:
and the second dummy load circuit is used for stabilizing the voltage of the non-stabilized output end under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value.
In some embodiments, the voltage regulation circuit further comprises a controller connected to the second dummy load circuit, the method further comprising:
the controller obtains the voltage at two ends of the first resistor, and increases the load current of the motor driving circuit under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value.
According to the technical scheme provided by the embodiment of the application, the voltage adjusting circuit comprises: the first dummy load circuit and the second dummy load circuit are arranged between the non-voltage-stabilizing output end and the grounding end in parallel; the first dummy load circuit comprises a first resistor; the second dummy load circuit is a motor driving circuit and is used for stabilizing the voltage of the non-voltage-stabilizing output end under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value. Therefore, in the embodiment of the application, because the second dummy load circuit is additionally arranged, the designed load current of the first dummy load circuit can be designed to be smaller, so that the standby power consumption is reduced, and when the output voltage of the non-stabilized output end is too high, the voltage stabilization is carried out through the second dummy load circuit, the voltage stabilization requirement of the non-stabilized output end can be met, thus, the contradiction between the voltage stabilization design and the standby power consumption caused by setting the load current of the dummy load is avoided, and the reduction of the standby power consumption of the switching power supply and the realization of the voltage stabilization control of the non-stabilized output end of the switching power supply are facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a voltage regulation circuit of a switching power supply according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power supply system of an air conditioner electronic control main control according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a second dummy load circuit according to an embodiment of the present application;
fig. 4 is a schematic diagram of an operation process of the power supply system in the embodiment of the present application.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the examples provided herein are merely illustrative of the present application and are not intended to limit the present application. In addition, the following examples are provided as partial examples for implementing the present application, not all examples for implementing the present application, and the technical solutions described in the examples of the present application may be implemented in any combination without conflict.
Where in the description of the present application reference has been made to the terms "first", "second", etc. merely to distinguish between similar items and not to indicate a particular ordering for the items, it is to be understood that "first", "second", etc. may be interchanged with respect to a particular order or sequence of events to enable embodiments of the application described herein to be performed in an order other than that illustrated or described herein. Unless otherwise indicated, "plurality" means at least two.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, for example, as either a mechanical or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The embodiment of the present application provides a voltage regulation circuit of a switching power supply, as shown in fig. 1, the switching power supply 1 has a regulated output terminal 11 and at least one unregulated output terminal 12, and the voltage regulation circuit 2 includes: a first dummy load circuit 21 and a second dummy load circuit 22 provided in parallel between the unregulated output terminal 12 and the ground terminal. Wherein the first dummy load circuit 12 comprises a first resistor; the second dummy load circuit 22 is a motor driving circuit, and the second dummy load circuit 22 is configured to regulate the non-regulated output terminal 12 when the voltage across the first resistor is greater than or equal to the voltage threshold.
In the embodiment of the present application, since the second dummy load circuit 22 is additionally provided, the designed load current of the first dummy load circuit 21 can be designed to be small, so as to reduce the standby power consumption, and when the output voltage of the unregulated output terminal 12 is too high, the voltage stabilization requirement of the unregulated output terminal 12 can be satisfied by stabilizing the voltage through the second dummy load circuit 22, so that the contradiction between the voltage stabilization design and the standby power consumption caused by setting the load current of the dummy load is avoided, which is beneficial to reducing the standby power consumption of the switching power supply and realizing the voltage stabilization control of the unregulated output terminal 12 of the switching power supply 1.
Further, the first resistor serves as a dummy load of the first dummy load circuit 21, and the dummy load exists consistently, so that the electrolytic capacitor on the side of the unregulated output terminal 12 can be discharged after the switching power supply 1 is powered off, and initial voltage stabilization can be performed when the voltage of the unregulated output terminal 12 is too high.
In the embodiment of the present application, the resistance value of the first resistor is determined based on the design voltage of the unregulated output terminal and the initially regulated design load current.
Illustratively, the design voltage of the unregulated output terminal is 24V, the voltage of the unregulated output terminal is unstable voltage, and the voltage range is as follows: 22V-36V; the designed load current of the initial voltage stabilization is a small current, for example, the designed load current of the initial voltage stabilization is 0.5mA, and thus, the resistance value of the first resistor may be 24V/0.5mA, i.e., 48K Ω.
It can be understood that, when the switching power supply 1 has multiple unregulated output terminals 12, the voltage regulating circuit 2 may be disposed at each unregulated output terminal 12, that is, the voltage regulating circuit 2 corresponding to each unregulated output terminal 12 performs voltage regulation control.
In some embodiments, the voltage regulation circuit 2 may further comprise a controller connected to the second dummy load circuit 22; the controller is used for acquiring voltage at two ends of the first resistor, and increasing load current of the motor driving circuit under the condition that the voltage at two ends of the first resistor is larger than or equal to a voltage threshold value.
Illustratively, the amount of increase in load current of the motor drive circuit is positively correlated with a voltage difference value representing a difference of the voltage across the first resistance minus a voltage threshold.
It can be seen that under the condition of controlling and increasing the load current of the motor driving circuit, the second dummy load circuit 2 can be used for effectively stabilizing the voltage of the non-stabilized output end 12, and the accuracy of the power supply voltage of the non-stabilized output end 12 is improved.
In some embodiments, the motor drive circuit may be a three-phase motor drive circuit;
accordingly, the controller is specifically configured to increase the duty cycle of any corresponding pulse width adjustment signal in the three-phase motor driving circuit when the voltage across the first resistor is greater than or equal to the voltage threshold.
Illustratively, the amount of increase in the duty cycle of the pulse width adjustment signal is positively correlated with a voltage difference value representing a difference of the voltage across the first resistor minus a voltage threshold.
It can be seen that the load current of the motor driving circuit can be increased by increasing the duty ratio of any corresponding pulse width adjustment signal in the three-phase motor driving circuit, so that the second dummy load circuit 2 can be used for effectively stabilizing the voltage of the non-regulated output terminal 12, and the accuracy of the supply voltage of the non-regulated output terminal 12 is improved.
In some embodiments, the voltage regulation circuit further comprises a voltage sampling circuit for sampling the voltage across the first resistor, and the controller is connected to the voltage sampling circuit.
It can be seen that by arranging the voltage sampling circuit, the controller can accurately know the voltages at the two ends of the first resistor, thereby laying a foundation for the voltage stabilization control of the non-stabilized voltage output end 12.
The voltage regulation circuit according to the embodiment of the present application is described below with reference to the drawings.
In some embodiments, as shown in fig. 2, the present application discloses a power supply system for an air conditioner electric control main control, the power supply system includes a switching power supply 1, and the switching power supply 1 has two voltage output terminals V1 and V2, where the voltage output terminal V1 is a regulated voltage output terminal, and the voltage output terminal V2 is an unregulated voltage output terminal. The voltage output end V2 side is provided with a first dummy load circuit 21; the first dummy load circuit 21 includes a first resistor R5.
A second dummy load circuit 22 may be further disposed at the voltage output terminal V2, fig. 3 is a schematic diagram of the second dummy load circuit, and the second dummy load circuit 22 is a three-phase motor driving circuit.
As shown in fig. 2, the switching power supply 1 includes: the transformer T1, the second resistor R1, the first capacitor C1, the first diode D1 and the power chip U1, wherein a direct current power supply is connected between the primary winding terminals 1 and 3 of the transformer T1, and the second resistor R1, the first capacitor C1 and the first diode D1 form an RCD absorption loop on the primary winding side and are used for absorbing redundant energy reflected by the secondary side. Pin 4 of the power chip U1 is connected to the primary winding terminal 3, and can control the voltage of the transformer T1. A winding terminal 4 of the transformer T1 is connected to a negative electrode of a dc power supply, a winding terminal 5 is used for supplying power to a power chip U1, the winding terminal 5 is connected to an anode of a second diode D2, a cathode of the second diode D2 is connected to a first end of a third resistor R2, a second end of the third resistor R2 is connected to a pin 2 of the power chip U1, a second end of the third resistor R2 is further connected to the negative electrode of the dc power supply through a second capacitor C2, a first end of the third resistor R2 is connected to a power supply terminal (shown as +17V in fig. 2), and a first end of the third resistor R2 is further connected to the negative electrode of the dc power supply through a first electrolytic capacitor E1 and a third capacitor C3 which are connected in parallel.
The secondary winding terminal 7 of the transformer T1 is connected to the anode of the third diode D4, the cathode of the third diode D4 is connected to the voltage output terminal V1, the secondary winding terminal 6 of the transformer T1 is grounded, and the cathode of the third diode D4 is grounded via the second electrolytic capacitor E3. Illustratively, the controllable regulator U3 is a TL431 reference voltage chip.
The output voltage of the voltage output terminal V1 is 12V. The voltage output terminal V1 is further provided with an output feedback circuit for voltage stabilization control, the output feedback circuit including: an optical coupler U2, a controllable voltage regulator source U3, a fourth resistor R7, a fifth resistor R8, a sixth resistor R9, a seventh resistor R10, an eighth resistor R11 and a fourth capacitor C4, wherein a first end of the sixth resistor R9 is connected with the voltage output end V1, a second end of the sixth resistor R9 is connected with a first end of an eighth resistor R11, a second end of the eighth resistor R11 is grounded, a first end of the fourth resistor R7 is connected with the voltage output end V1, a second end of the fourth resistor R7 is connected with a first end of a fifth resistor R8 and a common end is connected with a pin A of an optical coupler U2, a second end of the fifth resistor R8 is connected with a cathode of the controllable voltage regulator source U8 and a common end is connected with a pin K of the U8, an anode of the controllable voltage regulator source U8 is grounded and a reference pole is connected with a first end of the eighth resistor R8, and the seventh resistor R8 and the seventh capacitor C8 are further arranged between the second end of the fifth resistor R8 and the sixth resistor R8. The on-state voltage of the controllable voltage regulator source U3 can be set through the resistance values of the sixth resistor R9 and the eighth resistor R11; for example, when the controllable regulator U3 detects that the output of the voltage output terminal V1 reaches 12V, the controllable regulator U3 is turned on, so that the optocoupler U2 is turned off. Pin 1 of the power chip U1 is connected with pin C of the optocoupler U2, the common end of the power chip U1 is connected with the negative electrode of the direct-current power supply through a ninth resistor R3, and pin E of the optocoupler U2 is connected with the negative electrode of the direct-current power supply. When the optocoupler U2 cuts off, the switch tube of the power supply chip U1 cuts off, so that the power supply chip U1 can perform voltage stabilization control based on the output voltage of the voltage output end V1. By way of example, the embodiment of the application can realize that the fluctuation amplitude of the output power supply of the V1 does not exceed 3%.
It is to be understood that the output feedback circuit may also be in other forms, which is not limited in this application.
The secondary winding terminal 10 of the transformer T1 is connected to the anode of the fourth diode D3, the cathode of the fourth diode D3 is connected to the voltage output terminal V2, the secondary winding terminal 9 of the transformer T1 is grounded, and the cathode of the fourth diode D3 is grounded via the third electrolytic capacitor E2. The voltage output terminal V2 outputs 24V, which is unregulated voltage.
Referring to fig. 4, the working process of the power supply system in the embodiment of the present application is as follows:
when the voltage output end V1 and the voltage output end V2 both work under light load, the voltage output end V1 outputs 12V, the voltage output end V2 outputs 24V, and the controller can control the load current of any phase of the three-phase motor driving circuit to be zero, at this time, the first dummy load circuit 21 has very small current, which is beneficial to realizing the low power consumption of the switching power supply in standby.
When the power supply is disconnected, the third electrolytic capacitor E2 connected to the voltage output terminal V2 discharges through the first dummy load circuit 21, which is beneficial to solving the problem of voltage rise of the voltage output terminal V2 caused by no load, that is, the damage to the circuit caused by the existence of voltage can be reduced.
When the voltage output end V1 works under heavy load and the voltage output end V2 works under light load, the voltage of the voltage output end V2 rises along with the increase of the load of the voltage output end V1, and when the controller determines that the voltage at two ends of the first resistor R5 exceeds 26V, the load current of any phase in the three-phase motor driving circuit is gradually increased according to the voltage at two ends of the first resistor R5, so that the voltage rising amount of V2 is eliminated, and the unstable voltage output end 12 is effectively stabilized. For example, in the present application example, when the voltage output terminal V1 outputs the 2A current, the voltage output terminal V2 does not rise any more when rising to 28V.
Based on the working process of the power supply system, the embodiment of the application can realize two-way output flyback switching power supply circuit for air conditioner electric control main control, and can realize low-power consumption standby of 1W under the standby condition of the power supply system; under normal operation of the power supply system, the output voltage at the voltage output terminal V2 is not too high, i.e., does not exceed 28V.
Based on the voltage adjustment circuit described in the foregoing embodiment, an embodiment of the present application further provides a power supply system, which may include a switching power supply and any one of the voltage adjustment circuits described above.
In some embodiments, the motor drive circuit may be a drive circuit for a fresh air motor.
It can be seen that the embodiments of the present application have at least the following advantages:
1) the accuracy is high, can dynamic detection and regulation dummy load current, realizes that the output voltage of non-steady voltage output end is accurate controllable.
2) The novel air conditioner is low in cost, circuits do not need to be added, and the driving circuit of the existing fresh air motor is fully utilized as a dummy load, so that the miniaturization of a circuit board is facilitated, and the novel air conditioner can be suitable for the miniaturized fresh air motor.
3) The reliability is high, prevents that the bus voltage of the drive circuit of new trend motor from surpassing the safe voltage of specified 30V.
4) The power consumption is low: the dummy load current is adjusted according to the voltage sampling value, so that energy is saved compared with a dummy load with a fixed resistor.
Based on the voltage adjustment circuit described in the foregoing embodiment, the present application also provides a voltage adjustment method. The voltage adjusting method is applied to a voltage adjusting circuit of a switching power supply, and comprises the following steps:
and the second dummy load circuit is used for stabilizing the voltage of the non-stabilized output end under the condition that the voltage at two ends of the first resistor is greater than or equal to the voltage threshold value.
In some embodiments, the voltage regulation circuit further comprises a controller connected to the second dummy load circuit, the method further comprising: the controller obtains the voltage at two ends of the first resistor, and increases the load current of the motor driving circuit under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value.
The motor driving circuit is a three-phase motor driving circuit; the method further comprises the following steps: and the controller increases the duty ratio of any corresponding pulse width adjusting signal in the three-phase motor driving circuit under the condition that the voltage at two ends of the first resistor is greater than or equal to the voltage threshold.
It can be understood that the power supply system of the embodiment of the present application may be applied to the field of household electrical appliances such as air conditioners, washing machines, etc., wherein the number of the non-voltage-stabilized output terminals of the switching power supply may be one or more, and for a plurality of non-voltage-stabilized output terminals, the corresponding first dummy load circuit 21 and second dummy load circuit 22 may be respectively arranged, so as to implement the voltage-stabilized control of each non-voltage-stabilized output terminal.
The foregoing description of the various embodiments is intended to highlight various differences between the embodiments, and the same or similar parts may be referred to each other, which are not repeated herein for brevity
The methods disclosed in the method embodiments provided by the present application can be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in various product embodiments provided by the application can be combined arbitrarily to obtain new product embodiments without conflict.
The features disclosed in the various method or apparatus embodiments provided herein may be combined in any combination to arrive at new method or apparatus embodiments without conflict.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A voltage regulation circuit of a switching power supply, wherein the switching power supply has a voltage-stabilized output terminal and at least one non-voltage-stabilized output terminal, the voltage regulation circuit comprising:
the first dummy load circuit and the second dummy load circuit are arranged between the non-voltage-stabilizing output end and the grounding end in parallel;
the first dummy load circuit comprises a first resistor; the second dummy load circuit is a motor driving circuit and is used for stabilizing the voltage of the non-voltage-stabilizing output end under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value.
2. The voltage regulation circuit of claim 1, further comprising a controller coupled to the second dummy load circuit;
the controller is used for obtaining the voltage at two ends of the first resistor, and increasing the load current of the motor driving circuit under the condition that the voltage at two ends of the first resistor is larger than or equal to a voltage threshold value.
3. The voltage regulation circuit according to claim 2, wherein an amount of increase in load current of the motor drive circuit is positively correlated with a voltage difference value representing a difference obtained by subtracting a voltage threshold value from a voltage across the first resistor.
4. The voltage regulation circuit of claim 2, wherein the motor drive circuit is a three-phase motor drive circuit;
the controller is specifically configured to increase a duty cycle of any corresponding pulse width adjustment signal in the three-phase motor driving circuit when a voltage across the first resistor is greater than or equal to a voltage threshold.
5. The voltage regulation circuit of claim 4, wherein the duty cycle of the pulse width regulation signal increases by an amount that is positively correlated with a voltage difference value representing a difference of the voltage across the first resistor minus a voltage threshold.
6. The voltage regulation circuit of any one of claims 2 to 5, further comprising a voltage sampling circuit for sampling the voltage across the first resistor, the controller being connected to the voltage sampling circuit.
7. A power supply system comprising a switching power supply and a voltage regulation circuit as claimed in any one of claims 1 to 6.
8. The power supply system of claim 7, wherein the motor drive circuit is a drive circuit for a fresh air motor.
9. A voltage regulation method is applied to a voltage regulation circuit of a switching power supply, wherein the switching power supply is provided with one path of voltage-stabilized output end and at least one path of non-voltage-stabilized output end, and the voltage regulation circuit comprises: the first dummy load circuit and the second dummy load circuit are arranged between the non-voltage-stabilizing output end and the grounding end in parallel; the first dummy load circuit comprises a first resistor; the second dummy load circuit is a motor driving circuit; the method comprises the following steps:
and the second dummy load circuit is used for stabilizing the voltage of the non-stabilized output end under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value.
10. The voltage regulation method of claim 9, wherein the voltage regulation circuit further comprises a controller, the controller being coupled to the second dummy load circuit, the method further comprising:
the controller obtains the voltage at two ends of the first resistor, and increases the load current of the motor driving circuit under the condition that the voltage at two ends of the first resistor is greater than or equal to a voltage threshold value.
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| CN202111497905.0A CN114268225A (en) | 2021-12-09 | 2021-12-09 | Voltage regulation circuit and method of switching power supply and power supply system |
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| CN202111497905.0A CN114268225A (en) | 2021-12-09 | 2021-12-09 | Voltage regulation circuit and method of switching power supply and power supply system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2084708U (en) * | 1990-04-25 | 1991-09-11 | 青岛大学 | Electronic ballast of fluorescent lamp |
| JP2010088216A (en) * | 2008-09-30 | 2010-04-15 | Ricoh Co Ltd | Dc-dc converter |
| CN214205335U (en) * | 2020-12-31 | 2021-09-14 | 广东美的制冷设备有限公司 | Voltage adjusting circuit of switching power supply and power supply system |
| CN113514679A (en) * | 2021-04-16 | 2021-10-19 | 广东电网有限责任公司 | Universal modularized energy feedback type AC/DC virtual load |
-
2021
- 2021-12-09 CN CN202111497905.0A patent/CN114268225A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2084708U (en) * | 1990-04-25 | 1991-09-11 | 青岛大学 | Electronic ballast of fluorescent lamp |
| JP2010088216A (en) * | 2008-09-30 | 2010-04-15 | Ricoh Co Ltd | Dc-dc converter |
| CN214205335U (en) * | 2020-12-31 | 2021-09-14 | 广东美的制冷设备有限公司 | Voltage adjusting circuit of switching power supply and power supply system |
| CN113514679A (en) * | 2021-04-16 | 2021-10-19 | 广东电网有限责任公司 | Universal modularized energy feedback type AC/DC virtual load |
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