CN205811583U - Charger outfan safety protection circuit - Google Patents
Charger outfan safety protection circuit Download PDFInfo
- Publication number
- CN205811583U CN205811583U CN201620599639.0U CN201620599639U CN205811583U CN 205811583 U CN205811583 U CN 205811583U CN 201620599639 U CN201620599639 U CN 201620599639U CN 205811583 U CN205811583 U CN 205811583U
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- China
- Prior art keywords
- circuit
- switching device
- charger
- control
- outfan
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- 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.)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
This utility model relates to charger control circuit, specifically a kind of charger outfan safety protection circuit.This circuit includes the switching device being connected between the power supply of charge circuit and output port, and switching device can be turned on or off charge circuit；Being provided with a voltage sample point in circuit between switching device and output port, voltage sample point is connected to the sampled signal input of an ON-OFF control circuit；The control signal outfan of ON-OFF control circuit is connected to switching device, and can control the on-off of switching device.This utility model increases by a road control circuit in regular charger output voltage rear class, to reach the purpose of security protection, can ensure that human body will not touch output voltage under charger arbitrary device abnormality (comprising device open circuit or short circuit), improve safety；Its circuit structure is simple simultaneously, low cost.
Description
Technical field
This utility model relates to charger control circuit, specifically a kind of charger outfan safety protection circuit.
Background technology
For all types of battery chargers (such as: lithium battery charger etc.), when output voltage higher (such as output voltage >
Time 42.4Vdc), for meeting the requirement of safety certification, generally consider to improve from export structure, but thus can bring significantly
Cost increases, and weakens the competitiveness of product.In the field using lithium battery charger, along with high voltage output products compares low-voltage
Output products advantage body technically shows, and on market, manufacturer is all to high output voltage production development.Existing high voltage
The product of output can not take into account low cost and security requirement very well.
Summary of the invention
Technical problem to be solved in the utility model is to provide one can improve charger output port safety,
And the charger outfan safety protection circuit that circuit cost is low.
Charger outfan safety protection circuit of the present utility model includes power supply and the output being connected to charge circuit
Switching device between port, switching device can be turned on or off charge circuit；Between switching device and output port
Being provided with a voltage sample point in circuit, voltage sample point is connected to the sampled signal input of an ON-OFF control circuit；
The control signal outfan of ON-OFF control circuit is connected to switching device, and can control the on-off of switching device.
Described switching device includes a relay, and the contact of relay is connected in charge circuit.
Described ON-OFF control circuit includes a voltage comparator, and the comparison signal input of voltage comparator connects respectively
Reference voltage signal and described voltage sample point signal, the signal output part of voltage comparator is connected to the control of relay and returns
Road.
This utility model increases by a road control circuit in regular charger output voltage rear class, to reach the mesh of security protection
, it is possible under charger arbitrary device abnormality (comprising device open circuit or short circuit), ensure that human body will not touch output electricity
Pressure, improves safety；Its circuit structure is simple simultaneously, low cost.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model；
Fig. 2 is the circuit diagram of this utility model embodiment.
Detailed description of the invention
As it is shown in figure 1, wherein: Vo1: represent conventional output voltage；Bat+: represent the anode of battery bag.
Circuit includes the switching device being connected between the power supply of charge circuit and output port, and switching device can be led
On-off opens charge circuit；Circuit between switching device and output port is provided with a voltage sample point and (obtains sample
Signal Vo), voltage sample point is connected to the sampled signal input of an ON-OFF control circuit；The control letter of ON-OFF control circuit
Number outfan is connected to switching device, and can control the on-off of switching device.
After charger is connected with battery, ON-OFF control circuit detects voltage, makes control circuit export high level, thus
Open switching device.
When charger is not connected to battery, switching device disconnects, and output port is not charged.
In the circuit of embodiment illustrated in fig. 2, switching device includes a relay, and the contact K2 of relay is connected to charging
In loop.ON-OFF control circuit includes a voltage comparator U404A.
In circuit shown in Fig. 2:
Vo1: represent conventional output voltage；
Bat+: represent the anode of battery bag；
Bat-: represent the negative terminal of battery bag；
Vcc1, Vcc2 are produced by charger internal circuit.Wherein Vcc1 is by giving comparator after R445, R446 dividing potential drop
U404A provides a stable reference voltage；Vcc2 powers to relay, simultaneously by, after R447, R448 dividing potential drop, making comparator
The 1 foot output high level of U404A, thus open relay tip K2.
From circuit, when charger is not connected to battery, relay is off connection.Coordinate regular charger
Another level control output voltage circuit, it is ensured that under charger arbitrary device abnormality ensure human body will not touch
Output voltage.
Claims (3)
1. a charger outfan safety protection circuit, is characterized in that: include power supply and the output being connected to charge circuit
Switching device between port, switching device can be turned on or off charge circuit；Between switching device and output port
Being provided with a voltage sample point in circuit, voltage sample point is connected to the sampled signal input of an ON-OFF control circuit；
The control signal outfan of ON-OFF control circuit is connected to switching device, and can control the on-off of switching device.
Charger outfan safety protection circuit the most according to claim 1, is characterized in that: described switching device includes one
Individual relay, the contact of relay is connected in charge circuit.
Charger outfan safety protection circuit the most according to claim 2, is characterized in that: described ON-OFF control circuit bag
Including a voltage comparator, the comparison signal input of voltage comparator connects reference voltage signal and described voltage sample respectively
Point signal, the signal output part of voltage comparator is connected to the control loop of relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620599639.0U CN205811583U (en) | 2016-06-20 | 2016-06-20 | Charger outfan safety protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620599639.0U CN205811583U (en) | 2016-06-20 | 2016-06-20 | Charger outfan safety protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205811583U true CN205811583U (en) | 2016-12-14 |
Family
ID=58143238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620599639.0U Active CN205811583U (en) | 2016-06-20 | 2016-06-20 | Charger outfan safety protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205811583U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110892275A (en) * | 2018-09-30 | 2020-03-17 | Oppo广东移动通信有限公司 | System and method for testing charging device |
-
2016
- 2016-06-20 CN CN201620599639.0U patent/CN205811583U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110892275A (en) * | 2018-09-30 | 2020-03-17 | Oppo广东移动通信有限公司 | System and method for testing charging device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |