CN203339686U - Constant current source short circuit protection inhibition circuit - Google Patents
Constant current source short circuit protection inhibition circuit Download PDFInfo
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- CN203339686U CN203339686U CN2013204407889U CN201320440788U CN203339686U CN 203339686 U CN203339686 U CN 203339686U CN 2013204407889 U CN2013204407889 U CN 2013204407889U CN 201320440788 U CN201320440788 U CN 201320440788U CN 203339686 U CN203339686 U CN 203339686U
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- current source
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- constant current
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- power supply
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Abstract
The utility model relates to a constant current source short circuit protection inhibition circuit. According to the utility model, the technical problem to be solved is to overcome the disadvantage that when a constant current power supply is aging, the work stops at the moment of starting due to short circuit protection in the existing technology; and the constant current source short circuit protection inhibition circuit is provided. According to the technical scheme used by the utility model to solve the technical problem, the constant current source short circuit protection inhibition circuit comprises a constant current power supply circuit with a constant current source and diodes; the positive electrodes of the diodes are connected with the negative electrode of the constant current source; and the negative electrodes of the diodes are connected with the ground. The circuit provided by the utility model has the advantages that when the starting of the aging power supply is carried out, clamping is carried out on the negative end voltage of the constant current source through the diodes which are connected in series; the power supply carries out clamping output on the negative end voltage of the constant current source at the moment of starting; short circuit protection is avoided; the power supply is protected from damage; and the circuit has the advantages of simple structure, low cost and easy realization, and is suitable for constant current power supply aging.
Description
Technical field
The utility model relates to a kind of inhibition circuit of constant-current source short-circuit protection.
Background technology
For the aging enterprise of energy resource feedback system for power acquisition, because system is not supported the constant-current source inversion, must be converted into constant pressure source, and there is distinct disadvantage in the electronic load module that adopts constant current conversion constant voltage circuit to make---because the electronic load module input is connected to large electrochemical capacitor, booting moment has the greater impact electric current, and the modular power pipe is in long-term on off state, its impedance is low-resistance when the start conducting.The function of short-circuit protection that the constant-current source control chip is all integrated; it is mainly the negative terminal voltage that detects constant-current source; when negative terminal voltage is too high; be triggered to constant-current supply control chip OCP(Over current protection; while overcurrent protection) protecting threshold values; constant-current source quits work, the simultaneously too high fragile chip current passage of surge voltage.In order to make agingly normally to carry out, in the time of need to be to start, the short-circuit protection function of constant-current source be suppressed.But effective, reliable, a simple circuit can not realized constant-current source booting moment short-circuit protection function is suppressed now.
Existing constant-current power supply circuit comprises: the constant-current supply control chip is connected with the grid of MOSFET, and the source electrode of MOSFET joins by a resistance R and ground, and the drain electrode of MOSFET is connected with the negative pole of constant-current source.Constant-current supply realizes that the detailed process of short-circuit protection is: when the power supply output short-circuit, constant-current source negative terminal current potential starts to rise, and when reaching constant-current supply control chip detection threshold voltage, chip is judged as output short-circuit and quits work.
The utility model content
Technical problem to be solved in the utility model is to overcome constant-current supply in prior art, when aging, at booting moment, because of the out-of-work shortcoming of short-circuit protection, to provide a kind of inhibition circuit of constant-current source short-circuit protection.
The utility model solves the technical scheme that its technical problem adopts: the inhibition circuit of constant-current source short-circuit protection; comprise the constant-current power supply circuit with constant-current source; also comprise diode, the positive pole of described diode is connected with the negative pole of constant-current source, and the negative pole of diode joins with ground.
Concrete, diode is at least two, all diodes are connected in series.
Concrete, constant-current power supply circuit with constant-current source also comprises constant-current supply control chip, MOSFET and resistance, described constant-current supply control chip is connected with the grid of MOSFET, and the source electrode of MOSFET joins by resistance and ground, and the drain electrode of MOSFET is connected with the negative pole of constant-current source.
The beneficial effects of the utility model are: when aging power supply start, can carry out clamper by the negative terminal voltage of diode pair constant-current source, so just can make the negative terminal voltage of power supply in booting moment clamper output constant current source, and can not carry out short-circuit protection, to not infringement of power supply; And simple in structure, with low cost, be easy to realize.It is aging that the utility model is applicable to constant-current supply.
The accompanying drawing explanation
The circuit block diagram that Fig. 1 is the present embodiment;
Wherein, R is resistance, and D1 is the first diode, and D2 is the second diode.
Embodiment
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
The inhibition circuit of constant-current source short-circuit protection of the present utility model, comprise the constant-current power supply circuit with constant-current source, also comprises diode, and the positive pole of described diode is connected with the negative pole of constant-current source, and the negative pole of diode joins with ground.
Embodiment
As shown in Figure 1, the constant-current power supply circuit that this example has constant-current source comprises constant-current supply control chip, MOSFET and resistance R, described constant-current supply control chip is connected with the grid of MOSFET, and the source electrode of MOSFET joins by resistance R and ground, and the drain electrode of MOSFET is connected with the negative pole of constant-current source.Diode in this example is two, is respectively the first diode D1 and the second diode D2 is connected in series.The positive pole of the first diode D1 is connected with the negative pole of constant-current source, and the negative pole of the second diode D2 joins with ground.
When aging; the power supply booting moment; aging electronic load is Low ESR, and the cathode voltage of constant-current source raises rapidly, but owing between the negative pole of constant-current source and ground, having diode; the cathode voltage of constant-current source is clamped to low-voltage; lower than constant-current supply control chip short-circuit protection threshold values, do not trigger constant-current supply control chip OCP defencive function, suppress short-circuit protection function; it is aging that power supply normally plays machine, can improve the reliability of circuit simultaneously.
In addition, also can utilize one or realize the negative terminal voltage of constant-current source is carried out to clamper more than two diodes, the number of setting diode is N, with the threshold voltage difference for different constant-current supply control chips.Because the forward voltage drop tube VF of single diode is about 0.7V, the number of diode should meet: the threshold voltage of constant-current source negative terminal normal working voltage<N*VF<constant-current supply control chip.
Claims (3)
1. the inhibition circuit of constant-current source short-circuit protection, comprise the constant-current power supply circuit with constant-current source, it is characterized in that, also comprises diode, and the positive pole of described diode is connected with the negative pole of constant-current source, and the negative pole of diode joins with ground.
2. the inhibition circuit of constant-current source short-circuit protection as claimed in claim 1, is characterized in that, diode is at least two, and all diodes are connected in series.
3. the inhibition circuit of constant-current source short-circuit protection as claimed in claim 1 or 2; it is characterized in that; constant-current power supply circuit with constant-current source also comprises constant-current supply control chip, MOSFET and resistance (R); described constant-current supply control chip is connected with the grid of MOSFET; the source electrode of MOSFET joins by resistance (R) and ground, and the drain electrode of MOSFET is connected with the negative pole of constant-current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204407889U CN203339686U (en) | 2013-07-23 | 2013-07-23 | Constant current source short circuit protection inhibition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204407889U CN203339686U (en) | 2013-07-23 | 2013-07-23 | Constant current source short circuit protection inhibition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203339686U true CN203339686U (en) | 2013-12-11 |
Family
ID=49708342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204407889U Expired - Lifetime CN203339686U (en) | 2013-07-23 | 2013-07-23 | Constant current source short circuit protection inhibition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203339686U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818341A (en) * | 2019-03-12 | 2019-05-28 | 欧普照明股份有限公司 | A kind of surge current suppression circuit |
| CN113110668A (en) * | 2021-04-15 | 2021-07-13 | 常州易控汽车电子股份有限公司 | High-precision constant current source system |
-
2013
- 2013-07-23 CN CN2013204407889U patent/CN203339686U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818341A (en) * | 2019-03-12 | 2019-05-28 | 欧普照明股份有限公司 | A kind of surge current suppression circuit |
| CN113110668A (en) * | 2021-04-15 | 2021-07-13 | 常州易控汽车电子股份有限公司 | High-precision constant current source system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220207 Address after: 621000, No. 35 Mian Xing Dong Road, hi tech Zone, Sichuan, Mianyang Patentee after: SICHUAN CHANGHONG PRECISION ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 628017 Sichuan Changhong Xinrui Technology Co., Ltd., wangjiaying urban industrial park, Guangyuan Economic Development Zone, Sichuan Province Patentee before: SICHUAN CHANGHONG-SINEW TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |
|
| CX01 | Expiry of patent term |