CN106329605A - Environmental-friendly and energy-saving charger - Google Patents
Environmental-friendly and energy-saving charger Download PDFInfo
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- CN106329605A CN106329605A CN201510400136.6A CN201510400136A CN106329605A CN 106329605 A CN106329605 A CN 106329605A CN 201510400136 A CN201510400136 A CN 201510400136A CN 106329605 A CN106329605 A CN 106329605A
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- circuit
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- protection
- battery charger
- voltage
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an environmental-friendly and energy-saving charger. The environmental-friendly and energy-saving charger comprises an output voltage detection circuit, a protection voltage threshold constant circuit and a control signal delay circuit. A control signal is finally output to a power management chip by detecting an output voltage according to the characteristic that the voltage is instantaneously dropped to 0V when an output of a battery charger is in short-circuit, so that the whole battery charger stops working to achieve a protection effect. A protection function is achieved by a mode of stopping the working of the whole power supply, and the safety of the charger is ensured.
Description
Technical field
The present invention relates to battery charger field, particularly relate to battery charger charger.
Background technology
The application of current battery charger is more and more extensive, in the defencive function of battery charger, is typically necessary output short circuit protection, to prevent battery charger operating current excessive damage battery charger and load when output short-circuit.And the quality of output short circuit protection performance directly affects the reliability of whole battery charger.
At present, the short-circuit protection circuit in battery charger mostly uses the current peak limiting circuit within pulse width modulating chip to detect the operating current of transformer primary side, limits its peak value to reach the function of short-circuit protection.Due to this current peak simply limiting major loop, the most frequently protecting and recover, the operating current of major loop is the biggest, there is battery charger short circuit output residual voltage height, and loss is big, the problem that reliability is low.
The short-circuit protection circuit also having percentage of batteries charger is general detection output electric current, when detecting that output electric current stops battery charger operation time excessive and reaches the function of protection.Owing to this detection mode needs series connection sampling resistor on output loop, along with the increase of battery charger output-current rating, it is desirable to use greater power and the sampling resistor of less resistance, this volume also making short-circuit protection circuit and cost to increase.
Summary of the invention
For above-mentioned the problems of the prior art and shortcoming; this novel practical proposes a kind of battery charger short-circuit protection circuit; the operating current of battery charger and loss during to reduce short-circuit protection; improve the reliability of power supply, and volume and cost will not increase because of the increase of battery charger rated current.
Technical scheme is as follows:A kind of environment-friendly and energy-efficient charger,Including output voltage detecting circuit, protection voltage threshold, circuit, control signal delay circuit are set wherein:
Protection voltage threshold arranges circuit for arranging short-circuit protection threshold voltage, and this voltage is generally the 5% ~ 30% of output voltage；
Output voltage detecting circuit, for detecting whether output voltage has the phenomenon less than short-circuit protection threshold voltage；
Control signal delay circuit, when output voltage detecting circuit detects short-circuit as now, described control signal delay circuit can produce delay time, if power supply output departs from short-circuit condition in delay time, then battery charger normally works；If power supply output is constantly in short-circuit condition in delay time, control signal delay circuit will send short-circuit protection signal and cut out battery charger to battery charger managing chip.This delay circuit is mainly used in strengthening the capacity of resisting disturbance of this protection circuit.
Short-circuit protection signal can be used to draw high the pressure feedback port of power management chip, stops battery charger operation.
Patent of the present invention provides the benefit that:
1, device provided by the present invention is used; use current peak limiting circuit within pulse width modulating chip to compared with carrying out short-circuit protection scheme with background technology is mentioned; owing to using time delay and stopping the mode of battery charger operation; when significantly reducing short-circuit protection, the operating current of battery charger and loss, improve the reliability of battery charger.
2, use with background technology is mentioned the mode of detection output electric current to compared with carrying out short-circuit protection scheme, only used divider resistance due to this circuit and sampled so that this circuit will not volume and cost increase by the increase of source nominal output electric current.
Accompanying drawing explanation
Accompanying drawing 1 is the theory diagram of the present invention；
Accompanying drawing 2 is the circuit theory diagrams of the present invention.
Detailed description of the invention
Operation principle below in conjunction with Fig. 1,2 pairs of patents of the present invention is described further:
Patent of the present invention includes that output voltage detecting circuit 1, protection voltage threshold arrange circuit 2 and control signal delay circuit 3.
Being formed start delay circuit by R8 ~ R12, Q1, U1B, C2 in Fig. 2, when battery charger is started shooting, U1A the 1st foot output low level can be pulled to low level by R8 and Q1 by U1B the 7th foot；VCC is slowly charged to C2 by R11 simultaneously, when C2 is charged to voltage higher than R9 and R10 dividing potential drop voltage (i.e. U1B the 6th foot voltage) out, U1B the 7th foot output high level turns off Q1 makes U1A the 1st foot voltage no longer be dragged down by force, the effect of start delay circuit leaves it at that, depending on the short circuit duration that the time delay of this circuit can bear according to the charging interval of battery charger output capacitance (including the output capacitance of this power supply and the input capacitance of load) and battery charger, time, the shortest power supply cannot start, oversize power supply and load may be brought infringement, time is usually arranged as between 0.5S ~ 1S；
Formed protection voltage threshold by R4 ~ R7 in Fig. 2 and circuit 2 is set, a reference voltage (i.e. U1A the 2nd foot voltage) is gone out by R4 and R5 dividing potential drop, the protection threshold voltage (generally the 10% ~ 20% of output voltage) that R6 and R7 converts out further according to battery charger output voltage determines sampled voltage (i.e. U1A the 3rd foot voltage) with the reference voltage of U1A the 2nd foot, when U1A the 3rd foot sampled voltage is less than the reference voltage of U1A the 2nd foot, U1A the 1st foot exports high level at once, high level passes through D1 again, R3, R2, U2, D3, R1, signal is reached battery charger managing chip by the circuit of Q2 composition, by the way of battery charger managing chip pressure feedback port level is drawn high, battery charger cuts out again；
nullBy R6 in Fig. 2、The voltage detecting circuit 1 of R7 composition，R6 one end is directly connected to battery charger output voltage，When short circuit phenomenon occurs，Detection voltage can fall to 0V moment，By C1 in Fig. 2、R6、The capacity of resisting disturbance of the control signal delay circuit 3(the longest battery charger of control signal delay time of R7 composition is the strongest，But must be in the range of the short circuit duration that battery charger can bear，Infringement is brought beyond power supply and load may be given，Time is usually arranged as between 100ms ~ 600ms)，Can slowly discharge，When being discharged to U1A the 3rd foot voltage less than U1A the 2nd foot voltage，U1A the 1st foot can export high level，Pass through D1 again、R3、R2、U2、D3、R1、Signal is reached battery charger managing chip and is closed by battery charger by the circuit of Q2 composition.
Environment-friendly and energy-efficient charger provided by the present invention can be widely used in all kinds of battery charger apparatus, particularly requires to be lost during power supply short circuit little, in the occasion that reliability is high and high to small product size and cost requirement.
Invention described above embodiment, is not intended that limiting the scope of the present invention.Any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, within should be included in the claims of the present invention.
Claims (1)
1. an environment-friendly and energy-efficient charger, it is characterised in that: include that output voltage detecting circuit, protection voltage threshold arrange circuit and control signal delay circuit；
Described protection voltage threshold arranges circuit, is used for arranging short-circuit protection threshold voltage；
Described output voltage detecting circuit, for detecting whether output voltage has the phenomenon less than short-circuit protection threshold voltage；
Described control signal delay circuit, when output voltage detecting circuit detects short circuit phenomenon, described control signal delay circuit can produce delay time, if power supply output departs from short-circuit condition in delay time, then battery charger normally works；If power supply output is constantly in short-circuit condition in delay time, control signal delay circuit will send short-circuit protection signal and cut out battery charger to battery charger managing chip；This delay circuit is mainly used in strengthening the capacity of resisting disturbance of this protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510400136.6A CN106329605A (en) | 2015-07-09 | 2015-07-09 | Environmental-friendly and energy-saving charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510400136.6A CN106329605A (en) | 2015-07-09 | 2015-07-09 | Environmental-friendly and energy-saving charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106329605A true CN106329605A (en) | 2017-01-11 |
Family
ID=57725490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510400136.6A Pending CN106329605A (en) | 2015-07-09 | 2015-07-09 | Environmental-friendly and energy-saving charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106329605A (en) |
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2015
- 2015-07-09 CN CN201510400136.6A patent/CN106329605A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170111 |
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| WD01 | Invention patent application deemed withdrawn after publication |