CN213279489U - Dynamic dummy load circuit and direct-current voltage-regulating power supply - Google Patents
Dynamic dummy load circuit and direct-current voltage-regulating power supply Download PDFInfo
- Publication number
- CN213279489U CN213279489U CN202022035132.1U CN202022035132U CN213279489U CN 213279489 U CN213279489 U CN 213279489U CN 202022035132 U CN202022035132 U CN 202022035132U CN 213279489 U CN213279489 U CN 213279489U
- Authority
- CN
- China
- Prior art keywords
- dummy load
- voltage
- module
- switch
- power output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model relates to a developments dummy load circuit and direct current voltage regulation power. The dynamic dummy load circuit comprises a module, a first dummy load and a second dummy load; the first end of the gating module is connected with the power output end and used for acquiring the output voltage of the power output end; the second end of the gating module is connected with one end of the first dummy load, the third end of the gating module is connected with one end of the second dummy load, and the gating module is used for communicating the first dummy load with the power output end when the output voltage is larger than or equal to the first threshold voltage, and communicating the second dummy load with the power output end when the output voltage is larger than or equal to the second threshold voltage. The dummy load communicated with the power supply output end is changed due to the change of the output voltage through the gating module, and the purpose of reducing the fluctuation of the no-load voltage caused by the change of the output voltage is achieved.
Description
Technical Field
The utility model relates to a direct current power supply technical field especially relates to a developments dummy load circuit and a direct current voltage regulating power supply.
Background
The direct current voltage-regulating switch power supply is widely used in industrial control, LED lighting test, household appliance maintenance and various research and development laboratories, the most critical part of the direct current voltage-regulating switch power supply is a power change part, and the power change part directly influences the stability and reliability of the whole power supply and even the whole product. At present, no matter the step-down power supply, the step-up power supply or the step-up and step-down power supply is provided with a dummy load at the output end of the power supply, so that a minimum loop is provided for the whole power supply system, the stability of the whole power supply is improved, and the situation that the no-load voltage of the power supply is high and terminal equipment is burnt out is prevented.
In the DC voltage-regulating power supply with the dummy load, the output voltage is variable, when the output voltage is high, the load current of the dummy load is increased, so that the loss of the dummy load is overlarge, and when the output voltage is low, the load current of the dummy load is too low, so that the dummy load cannot act as the dummy load, and the no-load voltage is fluctuated.
SUMMERY OF THE UTILITY MODEL
Accordingly, there is a need for a dynamic dummy load circuit and a dc voltage regulator that can reduce no-load voltage fluctuations due to output voltage variations.
A dynamic dummy load circuit comprising: the system comprises a gating module, a first dummy load and a second dummy load;
the first end of the gating module is connected with the power output end and used for acquiring the output voltage of the power output end;
the second end of the gating module is connected with one end of the first dummy load, the third end of the gating module is connected with one end of the second dummy load, and the gating module is used for communicating the first dummy load with the power output end when the output voltage is greater than or equal to a first threshold voltage, and communicating the second dummy load with the power output end when the output voltage is greater than or equal to a second threshold voltage.
In one embodiment, the equivalent resistance value of the second dummy load is greater than the equivalent resistance value of the first dummy load.
In one embodiment, the gating module comprises:
a first switch module, one end of which is connected in series with the first dummy load and is used for conducting when the output voltage is greater than or equal to a first threshold voltage and communicating the first dummy load with the power output end;
one end of the second switch module is connected with the second dummy load in series and used for conducting when the output voltage is greater than or equal to a second threshold voltage and communicating the second dummy load with the power supply output end; and the other end of the second switch module is connected with the other end of the first switch module in parallel and then serves as the first end of the gating module.
In one embodiment, the first switch module comprises:
one end of the driving module is connected with the power output end and is used for generating driving voltage according to the output voltage;
the control end of the first switch tube is connected with the other end of the driving module, the input end of the first switch tube is connected with the power output end, and the output end of the first switch tube is connected with one end of the first dummy load; the first switch tube is used for being conducted when the driving voltage is larger than or equal to a preset driving voltage, and communicating the first dummy load with the power output end.
In one embodiment, the second dummy load comprises the driving module.
In one embodiment, the gating module is further configured to disconnect the first dummy load from the power output terminal when the output voltage is greater than or equal to a second threshold voltage.
In one embodiment, the second switch module comprises:
the first end of the voltage division module is connected with the power output end and used for generating starting voltage according to the output voltage;
the input end of the second switch tube is connected with the control end of the first switch tube, the output end of the second switch tube is connected with the second end of the voltage division module, the control end of the second switch tube is connected with the third end of the voltage division module, and the second switch tube is used for being switched on when the starting voltage is greater than or equal to the preset starting voltage, communicating the second dummy load with the power output end and switching off the first switch tube.
In one embodiment, the dynamic dummy load circuit further includes a protection module, one end of the protection module is connected to the control end of the first switch tube, and the other end of the protection module is connected to the other end of the first dummy load.
In one embodiment, the first switch tube and the second switch tube comprise at least one of a triode and a field effect transistor, and the first dummy load and the second dummy load each comprise a resistive load.
A direct current voltage regulating power supply comprises a transformer and the dynamic dummy load circuit, wherein the dynamic dummy load circuit is connected with the secondary side of the transformer in parallel.
According to the dynamic dummy load circuit and the direct-current voltage-regulating power supply, the first dummy load is communicated with the power supply output end when the output voltage is larger than or equal to the first threshold voltage through the gating module, and the second dummy load is communicated with the power supply output end when the output voltage is larger than or equal to the second threshold voltage, so that the dummy load communicated with the power supply output end is changed due to the change of the output voltage, and the purpose of reducing the fluctuation of the no-load voltage caused by the change of the output voltage is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a dynamic dummy load circuit according to a first embodiment;
FIG. 2 is a block diagram showing the structure of a dynamic dummy load circuit in the second embodiment;
FIG. 3 is a block diagram showing the structure of a dynamic dummy load circuit in the third embodiment;
FIG. 4 is a circuit diagram of a dynamic dummy load circuit in one embodiment;
FIG. 5 is a circuit diagram of a dynamic dummy load circuit in another embodiment;
FIG. 6 is a circuit diagram of a dynamic dummy load circuit in yet another embodiment;
fig. 7 is a schematic structural diagram of a dc voltage-regulating power supply in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, as shown in fig. 1, there is provided a dynamic dummy load circuit comprising: a gating module 100, a first dummy load 200, a second dummy load 300;
the first end of the gating module 100 is connected to a power output terminal Vout and is configured to obtain an output voltage Vout of the power output terminal OUT;
the second terminal of the gating module 100 is connected to one terminal of the first dummy load 200, the third terminal of the gating module 100 is connected to one terminal of the second dummy load 300, and the gating module is configured to communicate the first dummy load 200 with the power output terminal OUT when the output voltage Vout is greater than or equal to a first threshold voltage VT1, and communicate the second dummy load 300 with the power output terminal OUT when the output voltage Vout is greater than or equal to a second threshold voltage VT 2.
When the output voltage Vout is greater than or equal to the first threshold voltage VT1, the first dummy load 200 is connected to the power output terminal OUT through the gating module 100, that is, the first dummy load 200 is connected to the voltage output terminal OUT in parallel; when the output voltage Vout is greater than or equal to the second threshold voltage VT2, connecting the second dummy load 300 to the power output terminal OUT, i.e., connecting the second dummy load 300 in parallel to the voltage output terminal OUT; the equivalent resistance value of the dummy load connected with the power supply output end in parallel is variable instead of a fixed resistance value, so that the aim of reducing the fluctuation of no-load voltage caused by the variation of the output voltage is fulfilled.
In one embodiment, the gating module 100 is further configured to disconnect the first dummy load 200 from the power output terminal OUT when the output voltage Vout is greater than or equal to the second threshold voltage VT2, and only connect the second dummy load 200 to the power output terminal OUT.
In one embodiment, the equivalent resistance of the second dummy load 300 is smaller than the equivalent resistance of the first dummy load 200.
In the present embodiment, when the second threshold voltage VT2 is less than the first threshold voltage VT1, so that the output voltage is small, the first dummy load 200 is connected in parallel with the voltage output terminal OUT, and when the output voltage increases to the first threshold voltage VT1, the second dummy load 300 starts to be connected in parallel with the voltage output terminal OUT; or the second threshold voltage VT2 is greater than the first threshold voltage VT1 so that when the output voltage is small, the second dummy load 300 is connected in parallel with the voltage output terminal OUT, and when the output voltage increases to the second threshold voltage VT2, the first dummy load 200 starts to be connected in parallel with the voltage output terminal OUT. The voltage output end OUT, the first dummy load 200 and the second dummy load 300 are connected under different conditions, so that the equivalent resistance of the dummy load of the voltage output end OUT is a variable resistance, the equivalent resistance of the dummy load connected with the voltage output end OUT in parallel is controlled by the output voltage, and the purposes of balancing the loss of the output voltage and the dummy load and stabilizing the power output are achieved.
In one embodiment, the first dummy load 200 and the second dummy load 300 are both connected to the power output terminal OUT when the output voltage Vout is greater than or equal to the second threshold voltage VT 2. For example, the first dummy load 200 and the second dummy load 300 are connected in series to the power output terminal OUT, and compared with the connection between the first dummy load 200 and the power output terminal OUT, the equivalent resistance of the dummy load connected in parallel to the power output terminal OUT becomes larger, so that the purpose of reducing the total power loss of the dummy load at the power output terminal while improving the effect of the dummy load is achieved.
In one embodiment, the equivalent resistance of the second dummy load 300 is greater than the equivalent resistance of the first dummy load 200.
For example, the second threshold voltage VT2 is greater than the first threshold voltage VT1, and the first dummy load and the second dummy load are not connected in parallel with the voltage output terminal OUT at the same time. At this time, when the output voltage is small, the equivalent resistance of the dummy load connected in parallel with the voltage output end OUT is small, and when the output voltage is increased to the second threshold voltage VT2, the equivalent resistance of the dummy load connected in parallel with the voltage output end OUT is increased, so that the equivalent resistance of the dummy load connected in parallel with the voltage output end OUT is controlled by the output voltage, and the purposes of balancing the output voltage and the loss of the dummy load and stabilizing the power output are achieved.
As shown in fig. 2, in one embodiment, the gating module 100 includes: the first switch module 102 and the second switch module 104, wherein one end of the first switch module 102 is connected in series with the first dummy load 200, and when the output voltage Vout is greater than or equal to the first threshold voltage VT1, the first switch module 102 is turned on to connect the first dummy load 200 with the power output terminal OUT. One end of the second switch module 104 is connected in series with the second dummy load 300, and when the output voltage Vout is greater than or equal to the second threshold voltage VT2, the second switch module 104 is turned on to connect the second dummy load 300 with the power output terminal OUT; the other end of the second switch module 104 is connected in parallel with the other end of the first switch module 102 to serve as the first end of the gating module 100.
In this embodiment, the second terminal of the gating module 100 is a terminal of the first switching module 102 connected in series with the first dummy load 200, and the third terminal of the gating module 100 is a terminal of the second switching module 104 connected in series with the second dummy load 300.
The first switch module 102 and the second switch module 104 are both in an off state, and with the change of the output voltage Vout, the first dummy load 200 is connected to the power output terminal OUT by turning on the first switch module 102, and the second dummy load 300 is connected to the power output terminal OUT by turning on the second switch module 104.
In one embodiment, the gating module 100 further includes a comparing module (not shown in the figure) connected to the first switch module 102 and the second switch module 104, and the comparing module sends a first signal for controlling the first switch module 102 to conduct to the first switch module 102 when the output voltage Vout is greater than or equal to the first threshold voltage VT1, and sends a second signal for controlling the second switch module 104 to conduct to the second switch module 104 when the output voltage Vout is greater than or equal to the second threshold voltage VT2, so as to achieve the purpose of controlling the first switch module 102 and the second switch module 104 to conduct. The comparison module can be a common component or an electronic module with a comparison function, such as a comparator.
In one embodiment, the comparing module includes a first comparing module in the first switch module 102 and a second comparing module in the second switch module 104, and the first comparing module is configured to send a first signal for controlling the first switch module 102 to conduct when the output voltage Vout is greater than or equal to a first threshold voltage VT 1. The second comparing module is configured to send a first signal for controlling the second switching module 104 to be turned on when the output voltage Vout is greater than or equal to a second threshold voltage VT 2.
The comparison module controls the connection and disconnection between the power output end OUT and the first dummy load 200 and between the power output end OUT and the second dummy load 300, so that the control of the dummy load equivalent resistance connected to the power output end is realized.
As shown in fig. 3, in one embodiment, the first switch module 102 includes:
a driving module 1022, wherein one end of the driving module 1022 is connected to the power output terminal, and is configured to generate a driving voltage V1 according to the output voltage Vout;
a first switch tube 1024, a control end of the first switch tube 1024 being connected to the other end of the driving module 1022, an input end of the first switch tube 1024 being connected to the power output end, and an output end of the first switch tube 1024 being connected to one end of the first dummy load 200; the first switch tube 1024 is configured to be turned on when the driving voltage V1 is greater than or equal to a preset driving voltage V01, so as to connect the first dummy load 200 and the power output terminal OUT.
In this embodiment, the driving module 1022 generates a driving voltage V1 provided to the control terminal of the first switching tube 1024 according to the output voltage Vout of the power output terminal, where V1 is equal to or less than Vout, when the driving voltage V1 loaded between the control terminal and the output terminal of the first switching tube 1024 is greater than or equal to the preset driving voltage V01, that is, the turn-on voltage of the first switching tube 1024, the first switching tube 1024 is turned on, the first dummy load 200 is connected in parallel to the power output terminal OUT, where when the driving voltage V1 is V01, the corresponding output voltage Vout is the first threshold voltage VT 1.
As shown in fig. 4, in one embodiment, the second dummy load 300 includes the driving module 1022.
In one embodiment, the driving module 1022 includes a driving resistor R1, and the driving voltage V1 is equal to the output voltage Vout.
In one embodiment, the second switch module 104 comprises:
a voltage dividing module 1042, a first end of the voltage dividing module 4042 is connected to the power output end OUT, and is configured to generate a start voltage V2 according to the output voltage Vout;
an input end of the second switching tube 1044 is connected to the control end of the first switching tube 1024, an output end of the second switching tube 1044 is connected to the second end of the voltage dividing module 1042, and a control end of the second switching tube 1044 is connected to the third end of the voltage dividing module 1042, and is configured to be turned on when the starting voltage V2 is greater than or equal to a preset starting voltage V02, to connect the second dummy load 300 to the power output end, that is, to connect the driving resistor R1 to the power output end OUT, and to disconnect the first switching tube 1024.
In this embodiment, the voltage dividing module 142 generates a start voltage V2 provided to the second switch tube 1042 according to the output voltage Vout of the power output end, where V2< Vout, when the start voltage V2 loaded between the control end and the output end of the second switch tube 1042 is greater than or equal to a preset start voltage V02, that is, the turn-on voltage of the second switch tube 1042, the second switch tube 1042 is turned on, the second dummy load 300 is connected in parallel to the power output end OUT, where when the start voltage V2 is V02, the corresponding output voltage Vout is a second threshold voltage VT 2; the switching of the first dummy load 200 and the second dummy load 300 at the power output terminal OUT is realized by the second switching tube 1044.
As shown in fig. 5, in one embodiment, the voltage dividing module 1042 includes a voltage dividing resistor R2 and a voltage dividing resistor R3 connected in series, one end of the voltage dividing resistor R2 connected to the power output terminal OUT is a first end of the voltage dividing module, one end of the voltage dividing resistor R3 connected to the output terminal of the second switching tube 1042 is a second end of the voltage dividing module, a connection point of the voltage dividing resistors R2 and R3 is a third end of the voltage dividing module, and the start voltage V2 is a voltage across the voltage dividing resistor R3. By adjusting the ratio of the resistances of the voltage dividing resistors R2 and R3, the output voltage Vout corresponding to the preset starting voltage V02 of the second switch tube 1042 can be adjusted, so as to control the conduction of the first switch tube 1024 and the second switch tube 1042 with the voltage output end OUT.
As shown in fig. 5, in one embodiment, the dynamic dummy load circuit further includes a protection module 400, one end of the protection module 400 is connected to the control end of the first switch tube 1024, and the other end of the protection module 400 is connected to the other end of the first dummy load 200.
In this embodiment, when the voltage output terminal OUT has the output voltage Vout, the driving voltage V1 is provided to the control terminal of the first switch tube 1024 through the voltage division of the protection module 400 and the driving module 1022, so as to prevent the damage caused by the excessively high control terminal voltage of the first switch tube 1024.
In one embodiment, the first switch tube 1024 and the second switch tube 1042 comprise at least one of a triode and a field effect transistor, and the first dummy load 200 and the second dummy load 300 each comprise a resistive load.
In one embodiment, the preset driving voltage V01 of the first switch tube 1024 is 0.9V.
In one embodiment, the second switch tube 1042 is an NPN transistor, a base B of the transistor is a control terminal of the second switch tube 1042, a collector C of the transistor is an input terminal of the second switch tube 1042, and an emitter E of the transistor is an output terminal of the second switch tube 1042; the preset starting voltage V02 is equal to the saturation conducting voltage between the base B and the emitter E of the triode.
As shown in fig. 6, in one embodiment, the protection module 400 includes a protection resistor R4, and the first dummy load includes a load resistor R5. By changing the resistance ratio of the protection resistor R4 and the load resistor R5, the output voltage Vout corresponding to the preset driving voltage V01 of the first switching tube 1024 can be adjusted, so as to adjust the time for the dummy load to be connected to the power output terminal OUT.
The working process of the present application is specifically described below, assuming that the first switching tube 1024 is an NMOS tube Q1, the second switching tube 1042 is an NPN triode Q2, the first threshold voltage VT1 is smaller than the second threshold voltage VT2, the second dummy load 300 is a driving resistor R1, the resistance of the load resistor R5 is smaller than the resistance of the driving resistor R1, when the power output terminal OUT has the output voltage Vout, a driving voltage V1 is provided to the gate and the source of the MOS tube Q1 through voltage division on the driving resistor R1 and the protection resistor R4, and a starting voltage V2 is provided to the base and the emitter of the triode Q2 through voltage division resistors R2 and R3, wherein the sum of voltages at two ends of the driving voltage V1 and the load resistor R5 is equal to the voltage at two ends of the protection resistor R4, and the starting voltage V2 is equal to the voltage at two ends of the voltage division resistor R3. When the driving voltage V1 reaches the turn-on voltage of the MOS transistor Q1, Q1 is turned on, and the load resistor R5 serves as a dummy load of the power output terminal OUT. By changing the resistance ratio of the protection resistor R4 and the load resistor R5, the corresponding lowest output voltage during the dummy load operation can be adjusted, and the problem that the MOS transistor Q1 is damaged due to overhigh gate voltage of the MOS transistor Q1 can be prevented. When the starting voltage V2 reaches the conduction voltage of the triode Q2, the Q2 is conducted, the grid voltage of the MOS tube Q1 is pulled down and is connected with GND, the Q1 is closed, and the load resistor R5 does not work any more; the driving resistor R1 and the transistor Q2 form a new dummy load. By adjusting the resistance ratio of the voltage dividing resistors R2 and R3, the corresponding output voltage when Q1 and Q2 are switched can be adjusted. The dummy load can work normally when the power output end outputs low output voltage Vout, and when the high output voltage Vout is output, loss during high-voltage output is reduced by switching the dummy load resistor, so that the aim of improving efficiency is fulfilled.
In one embodiment, as shown in fig. 7, a dc voltage-regulated power supply is provided, which includes a transformer T1, and a dynamic dummy load circuit as described in any one of the above embodiments, which is connected in parallel to the secondary side of the transformer T1.
According to the dynamic dummy load circuit and the direct-current voltage-regulating power supply, the first dummy load is communicated with the power supply output end when the output voltage is larger than or equal to the first threshold voltage through the gating module, and the second dummy load is communicated with the power supply output end when the output voltage is larger than or equal to the second threshold voltage, so that the dummy load communicated with the power supply output end is changed due to the change of the output voltage, and the purpose of reducing the fluctuation of the no-load voltage caused by the change of the output voltage is achieved.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," 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, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A dynamic dummy load circuit, comprising: the system comprises a gating module, a first dummy load and a second dummy load;
the first end of the gating module is connected with the power output end and used for acquiring the output voltage of the power output end;
the second end of the gating module is connected with one end of the first dummy load, the third end of the gating module is connected with one end of the second dummy load, and the gating module is used for communicating the first dummy load with the power output end when the output voltage is greater than or equal to a first threshold voltage, and communicating the second dummy load with the power output end when the output voltage is greater than or equal to a second threshold voltage.
2. The dynamic dummy load circuit of claim 1, wherein the equivalent resistance of the second dummy load is greater than the equivalent resistance of the first dummy load.
3. The dynamic dummy load circuit of claim 1, wherein the gating module comprises:
a first switch module, one end of which is connected in series with the first dummy load and is used for conducting when the output voltage is greater than or equal to a first threshold voltage and communicating the first dummy load with the power output end;
one end of the second switch module is connected with the second dummy load in series and used for conducting when the output voltage is greater than or equal to a second threshold voltage and communicating the second dummy load with the power supply output end; and the other end of the second switch module is connected with the other end of the first switch module in parallel and then serves as the first end of the gating module.
4. The dynamic dummy load circuit of claim 3, wherein the first switch module comprises:
one end of the driving module is connected with the power output end and is used for generating driving voltage according to the output voltage;
the control end of the first switch tube is connected with the other end of the driving module, the input end of the first switch tube is connected with the power output end, and the output end of the first switch tube is connected with one end of the first dummy load; the first switch tube is used for being conducted when the driving voltage is larger than or equal to a preset driving voltage, and communicating the first dummy load with the power output end.
5. The dynamic dummy load circuit of claim 4, wherein the second dummy load comprises the driver module.
6. The dynamic dummy load circuit of claim 5, wherein the gating module is further configured to disconnect the first dummy load from the power supply output when the output voltage is greater than or equal to a second threshold voltage.
7. The dynamic dummy load circuit of claim 6, wherein the second switch module comprises:
the first end of the voltage division module is connected with the power output end and used for generating starting voltage according to the output voltage;
the input end of the second switch tube is connected with the control end of the first switch tube, the output end of the second switch tube is connected with the second end of the voltage division module, the control end of the second switch tube is connected with the third end of the voltage division module, and the second switch tube is used for conducting when the starting voltage is greater than or equal to the preset starting voltage, communicating the second dummy load and connecting the power output end in parallel and disconnecting the first switch tube.
8. The dynamic dummy load circuit of claim 4, further comprising a protection module, one end of the protection module being connected to the control terminal of the first switch tube, the other end of the protection module being connected to the other end of the first dummy load.
9. The dynamic dummy load circuit of claim 7, wherein the first switch transistor and the second switch transistor comprise at least one of a transistor and a field effect transistor, and wherein the first dummy load and the second dummy load each comprise a resistive load.
10. A dc regulated power supply comprising a transformer, characterized by a dynamic dummy load circuit as claimed in any one of claims 1 to 9 connected in parallel to the secondary side of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022035132.1U CN213279489U (en) | 2020-09-16 | 2020-09-16 | Dynamic dummy load circuit and direct-current voltage-regulating power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022035132.1U CN213279489U (en) | 2020-09-16 | 2020-09-16 | Dynamic dummy load circuit and direct-current voltage-regulating power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213279489U true CN213279489U (en) | 2021-05-25 |
Family
ID=75943047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022035132.1U Active CN213279489U (en) | 2020-09-16 | 2020-09-16 | Dynamic dummy load circuit and direct-current voltage-regulating power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213279489U (en) |
-
2020
- 2020-09-16 CN CN202022035132.1U patent/CN213279489U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7982447B2 (en) | Switched mode power supply having improved transient response | |
| KR101171431B1 (en) | Power system with temperature compensation control | |
| US10079538B2 (en) | Bootstrap circuit for DC/DC converter | |
| US7408332B2 (en) | Intelligent soft start for switching regulators | |
| CN101162866A (en) | Adjustable voltage stabilizer | |
| CN112039319A (en) | Drive circuit and drive method | |
| CN213279489U (en) | Dynamic dummy load circuit and direct-current voltage-regulating power supply | |
| US20070014063A1 (en) | Single pin multi-function signal detection method and structure therefor | |
| CN214704458U (en) | Low dropout regulator and power supply equipment | |
| CN214506880U (en) | Output voltage adjustable current expansion circuit, control system and electric appliance | |
| CN213846540U (en) | Auxiliary power supply circuit, driver and wind power generation system | |
| CN111313532B (en) | Power supply control circuit and power supply equipment | |
| CN112286277B (en) | Voltage regulating circuit | |
| CN114690828A (en) | LDO circuit, control method, chip and electronic equipment | |
| CN113157037A (en) | Low dropout regulator and power supply equipment | |
| CN113659805A (en) | A filter capacitor fast discharge circuit for numerically controlled power supply | |
| CN116742951B (en) | Switching power supply circuit and electronic device | |
| CN113726153A (en) | Voltage intelligent regulation method for voltage stabilizing module | |
| CN117155079B (en) | Driving circuit applied to power switch and power management chip | |
| CN220822633U (en) | Multi-output power supply system based on time sequence starting | |
| CN219394688U (en) | Starting circuit of control chip and switching power supply | |
| CN222674532U (en) | LED constant current output control circuit | |
| CN115877904B (en) | Linear voltage stabilizing circuit | |
| CN217063571U (en) | A DC voltage stabilized power supply circuit of a switching power supply driver chip | |
| CN220691372U (en) | Power supply circuit, mainboard and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |