CN204030944U - A kind of power initiation dummy load circuit - Google Patents

A kind of power initiation dummy load circuit Download PDF

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Publication number
CN204030944U
CN204030944U CN201420437367.5U CN201420437367U CN204030944U CN 204030944 U CN204030944 U CN 204030944U CN 201420437367 U CN201420437367 U CN 201420437367U CN 204030944 U CN204030944 U CN 204030944U
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CN
China
Prior art keywords
triode
power supply
switching power
conducting resistance
resistance
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.)
Expired - Fee Related
Application number
CN201420437367.5U
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Chinese (zh)
Inventor
罗烽
闵荣峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHENZHEN LICHUANG POWER CO Ltd
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SHENZHEN LICHUANG POWER CO Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority to CN201420437367.5U priority Critical patent/CN204030944U/en
Application granted granted Critical
Publication of CN204030944U publication Critical patent/CN204030944U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to Switching Power Supply electronics applied technical field, especially a kind of power initiation dummy load circuit.It comprises Schottky diode, the first conducting resistance, the second conducting resistance, the 3rd conducting resistance, dummy resistance, the first triode and the second triode; Base stage, output that the input of Schottky diode is connected in the first triode by the first conducting resistance are connected in Switching Power Supply output, one end of the second conducting resistance is connected with the base stage of the first triode, the emitter ground connection simultaneously of the emitter of the other end and the first triode, the second triode, one end of the 3rd conducting resistance is connected in the cathode output end of Switching Power Supply, collector electrode that the other end connects respectively the first triode and the base stage of the second triode, and the collector electrode of the second triode is connected in Switching Power Supply output by dummy resistance.Dummy load circuit of the present utility model is incorporated to Switching Power Supply in Switching Power Supply initial start stage, is removed after stable state at output voltage, avoids consumed power.

Description

A kind of power initiation dummy load circuit
Technical field
The utility model relates to Switching Power Supply electronics applied technical field, especially a kind of power initiation dummy load circuit.
Background technology
As everyone knows, current a lot of Switching Power Supplies, in the moment starting, voltage can't rise to the operating voltage of load at once, is now equivalent to complete zero load, easily occurs the phenomenon that Switching Power Supply cannot start or repeatedly start; For this problem, general common practice is as the dummy load that starts use, to ensure the normal startup of Switching Power Supply at the output terminal direct paralleled resistance of Switching Power Supply; But, be directly parallel to resistance in Switching Power Supply and can continue the power of electric consumption, affect power-efficient, particularly, under Light Condition, the proportion of consumed power can be obvious especially.
Utility model content
The deficiency existing for above-mentioned prior art, the purpose of this utility model be to provide a kind of simple in structure, safe and reliable, power consumption proportion is little and can effectively ensure the power initiation dummy load circuit of the normal startup of Switching Power Supply.
To achieve these goals, the utility model adopts following technical scheme:
A kind of power initiation dummy load circuit, it is connected in the cathode output end of Switching Power Supply, and it comprises Schottky diode, the first conducting resistance, the second conducting resistance, the 3rd conducting resistance, dummy resistance, the first triode and the second triode;
The input of described Schottky diode is connected in the base stage of the first triode by the first conducting resistance, output is connected in the cathode output end of Switching Power Supply, one end of described the second conducting resistance is connected with the base stage of the first triode, the emitter of the other end and the first triode, the emitter of the second triode is ground connection simultaneously, one end of described the 3rd conducting resistance is connected in the cathode output end of Switching Power Supply, the other end connects respectively the base stage of collector electrode and second triode of the first triode, the collector electrode of described the second triode is connected in the cathode output end of Switching Power Supply by dummy resistance.
Preferably, the low 3-5V of voltage of the cathode output end of the voltage ratio Switching Power Supply at described Schottky diode two ends.
Owing to having adopted such scheme, the utility model can be incorporated to dummy load circuit at the output of Switching Power Supply in Switching Power Supply initial start stage (being before the voltage of its output does not reach the operating voltage of load), to ensure the normal startup of Switching Power Supply; When the output voltage of Switching Power Supply is after stable state, dummy resistance can be removed, and to avoid consumed power, thereby improves the efficiency of Switching Power Supply; It is simple in structure, safe and reliable, has very strong practicality.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, a kind of power initiation dummy load circuit that the utility model provides, it is connected in the cathode output end V+ of Switching Power Supply, and it comprises Schottky diode ZD1, the first conducting resistance R1, the second conducting resistance R2, the 3rd conducting resistance R3, dummy resistance R4, the first triode Q1 and the second triode Q2, wherein, the input of Schottky diode ZD1 is connected in the base stage of the first triode Q1 by the first conducting resistance R1, output is connected in the cathode output end V+ of Switching Power Supply, one end of the second conducting resistance R2 is connected with the base stage of the first triode Q1, the emitter of the other end and the first triode Q1, the emitter of the second triode Q2 is ground connection simultaneously, one end of the 3rd conducting resistance R3 is connected in the cathode output end V+ of Switching Power Supply, the other end connects respectively the collector electrode of the first triode Q1 and the base stage of the second triode Q2, the collector electrode of the second triode Q2 is connected in the cathode output end V+ of Switching Power Supply by dummy resistance R4.
So, when Switching Power Supply initial start stage, before the voltage of its cathode output end V+ does not reach the starting resistor of Schottky diode ZD1, the first triode Q1 turn-offs, the second triode Q2 conducting, the cathode output end V+ of now dummy resistance R4 access Switching Power Supply is upper, thereby ensures the normal startup of Switching Power Supply.When the voltage of Switching Power Supply rises to after the starting resistor higher than Schottky diode ZD1 gradually, the first triode Q1 conducting, the second triode Q2 turn-offs, and now dummy resistance R4 is removed, thereby reduce the consumed power of dummy resistance R4, improve the efficiency of Switching Power Supply with this.
For ensureing the working effect of whole circuit, can make the low 3-5V of voltage of the cathode output end V+ of the voltage ratio Switching Power Supply at Schottky diode ZD1 two ends; Meanwhile, the large I of the resistance of dummy resistance R4 is selected according to actual setting start-up time demand.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.

Claims (2)

1. a power initiation dummy load circuit, it is characterized in that: it is connected in the cathode output end of Switching Power Supply, and it comprises Schottky diode, the first conducting resistance, the second conducting resistance, the 3rd conducting resistance, dummy resistance, the first triode and the second triode;
The input of described Schottky diode is connected in the base stage of the first triode by the first conducting resistance, output is connected in the cathode output end of Switching Power Supply, one end of described the second conducting resistance is connected with the base stage of the first triode, the emitter of the other end and the first triode, the emitter of the second triode is ground connection simultaneously, one end of described the 3rd conducting resistance is connected in the cathode output end of Switching Power Supply, the other end connects respectively the base stage of collector electrode and second triode of the first triode, the collector electrode of described the second triode is connected in the cathode output end of Switching Power Supply by dummy resistance.
2. a kind of power initiation dummy load circuit as claimed in claim 1, is characterized in that: the low 3-5V of voltage of the cathode output end of the voltage ratio Switching Power Supply at described Schottky diode two ends.
CN201420437367.5U 2014-08-04 2014-08-04 A kind of power initiation dummy load circuit Expired - Fee Related CN204030944U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420437367.5U CN204030944U (en) 2014-08-04 2014-08-04 A kind of power initiation dummy load circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420437367.5U CN204030944U (en) 2014-08-04 2014-08-04 A kind of power initiation dummy load circuit

Publications (1)

Publication Number Publication Date
CN204030944U true CN204030944U (en) 2014-12-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420437367.5U Expired - Fee Related CN204030944U (en) 2014-08-04 2014-08-04 A kind of power initiation dummy load circuit

Country Status (1)

Country Link
CN (1) CN204030944U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109710011A (en) * 2018-12-29 2019-05-03 普联技术有限公司 A kind of low-power consumption dummy load circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109710011A (en) * 2018-12-29 2019-05-03 普联技术有限公司 A kind of low-power consumption dummy load circuit

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Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141217

Termination date: 20190804

CF01 Termination of patent right due to non-payment of annual fee