WO2017113065A1

WO2017113065A1 - Automatic charging circuit and emergency lamp

Info

Publication number: WO2017113065A1
Application number: PCT/CN2015/099236
Authority: WO
Inventors: 黄鹤鸣; 许国伟; 刘春红
Original assignee: 深圳市聚作照明股份有限公司
Priority date: 2015-12-28
Filing date: 2015-12-28
Publication date: 2017-07-06
Also published as: CN107172889A

Abstract

An automatic charging circuit and an emergency lamp. The circuit is provided with a charging interface (VCC) connected to a direct current power supply. The automatic charging circuit comprises a sampling circuit (11), a reference voltage circuit (12), a comparison module (13), and a switching transistor (14). The sampling circuit (11) is connected to the cathode (BAT-) of a battery, detects a battery voltage, and outputs a sampled voltage. The positive input terminal of the comparison module (13) is connected to a reference voltage, and the negative input terminal thereof is connected to the sampled voltage outputted by the sampling circuit (11). The control terminal of the switching transistor (14) is connected to the output terminal of the comparison module (13), the input terminal thereof is connected to the charging interface (VCC), and the output terminal thereof is connected to the anode (BAT+) of the battery. The battery is charged when the reference voltage is greater than the sampled voltage, and charging of the battery is stopped when the reference voltage is less than the sampled voltage. The full-automatic charging circuit of the battery automatically charges the battery by detecting the battery voltage when the power supply is not disconnected, and automatically cuts off the charging after the battery is fully charged. The full-automatic charging circuit of the battery has a simple structure and low costs.

Description

Title: Inventive Name: An Automatic Charging Circuit and Emergency Lights

[0001] The present invention relates to battery charging technology, and more particularly to an automatic charging circuit and an emergency light fixture.

Background technique

[0002] The internal flow of horizontal traffic and vertical traffic in modern buildings is also growing. These buildings should be powered continuously, and in fact various disasters are also possible. Such as: fires, explosions and earthquakes. After these disasters occur, the normal power supply often fails or the power must be disconnected, and the normal lighting is completely extinguished. In order to protect the safety of personnel and property, and to effectively prevent the spread of disasters or accidents during production, work and operation, it should be put into emergency lighting immediately.

[0003] Current emergency lighting fixtures do not automatically cut off the battery, which may cause heat to burst, or manually cut off the charging after the charging is completed, wasting labor. Although it is possible to control the charging by using a microcomputer to process the chip, the charging can be effectively controlled, but the cost is high.

technical problem

[0004] An object of the present invention is to provide an automatic charging circuit for solving the problem that the battery does not automatically cut off when the battery is fully charged, or that the charging can be effectively controlled but the cost is high.

Problem solution

Technical solution

[0005] The present invention provides an automatic charging circuit for charging a battery, the automatic charging circuit is provided with a charging interface, and the charging interface is connected to a DC power source, including:

[0006] a sampling circuit, connected to the negative electrode of the battery, detecting the voltage of the battery and outputting a sampling voltage; [0007] a reference voltage circuit, connected to the charging interface, providing a reference voltage;

[0008] a comparison module, the positive input terminal is connected to the reference voltage, and the negative input terminal is connected to the sampling voltage output by the sampling circuit;

[0009] a control tube, the control end of the bypass tube is connected to the output end of the comparison module, the input end of the bypass tube is connected to the charging interface, and the output end of the bypass tube is connected to the battery Positive pole

[0010] wherein, when the reference voltage is greater than the sampling voltage 吋, the bypass tube is turned on to charge the battery When the reference voltage is less than the sampling voltage 吋, the bypass tube is turned off to stop charging the battery

[0011] The present invention also provides an emergency light fixture including a battery and a light source, and the above-described automatic charging circuit.

Advantageous effects of the invention

Beneficial effect

[0012] The battery automatic charging circuit of the above automatic charging circuit automatically charges the battery by detecting the voltage of the battery when the power is not broken, and automatically cuts off the charging after the battery is fully charged, and the structure is simple and the cost is low. Brief description of the drawing

DRAWINGS

1 is a schematic block diagram of an automatic charging circuit in accordance with a preferred embodiment of the present invention;

2 is a circuit schematic diagram of the automatic charging circuit shown in FIG. 1.

Embodiments of the invention

[0015] In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1 and FIG. 2, in the preferred embodiment of the present invention, an automatic charging circuit for an emergency luminaire can be used. The emergency luminaire includes a battery and a light source. The automatic charging circuit is used for charging a battery (not shown). The automatic charging circuit is provided with a charging interface vcc. The charging interface VCC is connected to a DC power supply. The automatic charging circuit comprises a sampling circuit 11, a reference voltage circuit 12, a comparison module 13 and幵管14.

[0017] The sampling circuit 11 is connected to the negative electrode BAT- of the battery, detects the voltage of the battery and outputs the sampling voltage; the reference voltage circuit 12 is connected to the charging interface VCC to provide a reference voltage; and the positive input terminal of the comparison module 13 is connected to the reference voltage, and is compared. The negative input terminal of the module 13 is connected to the sampling voltage outputted by the sampling circuit 11; the control terminal of the bypass transistor 14 is connected to the output terminal of the comparison module 13, the input terminal of the bypass transistor 14 is connected to the charging interface VCC, and the output terminal of the bypass transistor 14 is connected. Battery positive B AT+;

[0018] wherein, when the reference voltage is greater than the sampling voltage 吋, the bypass tube 14 is turned on to charge the battery, and when the reference voltage is less than the sampling voltage 吋, the bypass tube 14 is turned off to stop charging the battery. [0019] In one embodiment, the comparison module 13 includes a first comparison circuit 131 and a second comparison circuit 132. The positive input terminal and the negative input terminal of the first comparison circuit 131 serve as positive input terminals of the comparison module 13, respectively. The input end of the first comparison circuit 131 is connected to the negative input end of the second comparison circuit 132, the positive input terminal of the second comparison circuit 132 is connected to the reference voltage, and the output end of the second comparison circuit 132 is used as the output end of the comparison module 13. .

[0020] Preferably, the first comparison circuit 131 is a hysteresis comparator. Moreover, a current limiting resistor R0 is connected between the output end of the first comparison circuit 131 and the negative input terminal of the second comparison circuit 132, and the negative input terminal of the second comparison circuit 132 is grounded through a filter capacitor CO.

[0021] In one embodiment, the first comparison circuit 131 includes a first comparator U1A, a first capacitor Cl, a first resistor R1, a second resistor R2, a third resistor R3, and a first diode D1.

[0022] The inverting input terminal of the first comparator U1A is connected to the sampling voltage and one end of the first capacitor C1, and the non-inverting input terminal is connected to the reference voltage, the other end of the first capacitor C1, and one end of the second resistor R2 through the first resistor R1. The other end of the second resistor R2 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the output end of the first comparator U1A, and the third resistor R3 is connected to the charging interface VCC and the first comparator. Between the outputs of U1A, the output of the first comparator U1A serves as the output of the first comparison circuit 131.

[0023] In one of the embodiments, the second comparison circuit 132 includes a second comparator U1B, a fourth resistor R4, a fifth resistor R5, and a second diode D2.

[0024] The inverting input terminal of the second comparator U1B serves as a negative input terminal of the second comparison circuit 132, and the non-inverting input terminal of the second comparator U1B is connected to the reference voltage and one end of the fourth resistor R4, and the fourth resistor R4 The other end is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the output end of the second comparator U1B, and the fifth resistor R5 is connected between the output end of the second comparator U1B and the charging interface VCC. The output of the second comparator U1B serves as the output of the comparison module 13.

[0025] In one embodiment, the reference voltage circuit 12 includes a controllable precision voltage regulator source U2 and a sixth resistor R6, an anode base of the controllable precision voltage regulator source U2, and a cathode of the controllable precision voltage regulator source U2. The six resistors R6 are connected to the charging interface VCC, and the reference pole of the controllable precision voltage regulator source U2 is connected to the cathode and provides a reference voltage.

In one embodiment, the sampling circuit 11 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second capacitor C2, and a third diode D3.

[0027] The seventh resistor R7 has one end connected to the negative pole BAT - of the battery, and the other end connected to the anode of the third diode D3, and After the eighth resistor R8 is grounded, the anode of the third diode D3 is grounded through the ninth resistor R9, and is also grounded through the third capacitor, and the anode of the third diode D3 outputs a sampling voltage.

[0028] In one embodiment, the bypass tube 14 is a PNP type transistor, the input end and the output end of the bypass tube 14.

The control terminals are respectively the emitter, collector and base of the PNP transistor.

[0029] The working principle of the automatic charging circuit: the comparison module 13 is internally two comparators, the seventh resistor R7, the eight resistors sample the battery voltage (the output voltage of the network can be divided according to the rated voltage of the battery), the first comparator _U1A Form a hysteresis comparator with its peripheral circuit, when the battery voltage is lower than the set value of the reference voltage吋

The inverting input terminal of the first comparator U1A is lower than the non-inverting input terminal of the first comparator U1A, and the output terminal of the first comparator U1A outputs a high level, causing the inverting input terminal of the second comparator U1B to be electrically The level is lower than the non-inverting input terminal, and the output end of the second comparator U1B outputs a low level, so that the bypass tube 14 is turned on, and the battery starts to charge. When the battery charging voltage rises to the reference voltage, the voltage of the inverting input terminal of the first comparator U1A is higher than the non-inverting input terminal of the first comparator U1A, the output of the first comparator U1A outputs a low level, resulting in U2B The non-inverting input terminal is higher than the inverting input terminal, and the output terminal outputs a high level, so that the bypass transistor 14 is turned off, and the battery stops charging.

[0030] The battery automatic charging circuit of the above automatic charging circuit automatically charges the battery by detecting the voltage of the battery when the power is not broken, and the battery is automatically cut off after the battery is fully charged, and the structure is simple, compared with the microcomputer processing chip control. Charging is more cost effective, and it can be miniaturized and low cost.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalents, and improvements made within the spirit and scope of the present invention should be included in the present invention. Within the scope of protection of the invention.

Claims

Claim

[Claim 1] An automatic charging circuit for charging a battery, the automatic charging circuit is provided with a charging interface, and the charging interface is connected to a DC power source, and the method comprises:

a sampling circuit connected to a negative electrode of the battery, detecting a voltage of the battery and outputting a sampling voltage;

a reference voltage circuit connected to the charging interface to provide a reference voltage;

Comparing module, the positive input terminal is connected to the reference voltage, and the negative input terminal is connected to the sampling voltage output by the sampling circuit;

The control terminal of the bypass tube is connected to the output end of the comparison module, the input end of the bypass tube is connected to the charging interface, and the output end of the bypass tube is connected to the positive pole of the battery; Wherein, when the reference voltage is greater than the sampling voltage 吋, the bypass tube is turned on to charge the battery, and when the reference voltage is less than the sampling voltage 吋, the bypass tube is turned off to stop Charging batteries.

[Claim 2] The automatic charging circuit according to claim 1, wherein the comparison module includes a first comparison circuit and a second comparison circuit, and the positive input terminal and the negative input terminal of the first comparison circuit respectively As a positive input end and a negative input end of the comparison module, an output end of the first comparison circuit is connected to a negative input end of the second comparison circuit, and a positive input end of the second comparison circuit is connected to the reference voltage The output of the second comparison circuit serves as an output of the comparison module.

[Claim 3] The automatic charging circuit according to claim 2, wherein the first comparison circuit is a hysteresis comparator.

[Claim 4] The automatic charging circuit according to claim 2, wherein a current limiting resistor is connected between the output end of the first comparing circuit and the negative input end of the second comparing circuit, and The negative input of the second comparison circuit is grounded through a filter capacitor.

[Claim 5] The automatic charging circuit according to claim 2, wherein the first comparison circuit comprises a first comparator, a first capacitor, a first resistor, a second resistor, a third resistor, and a first Diode, where:

The inverting input terminal of the first comparator is connected to the sampling voltage and one of the first capacitors The non-inverting input terminal is connected to the reference voltage, the other end of the first capacitor, and one end of the second resistor through the first resistor, and the other end of the second resistor is connected to the first diode An anode, a cathode of the first diode is connected to an output end of the first comparator, and a third resistor is connected between the charging interface and an output end of the first comparator, An output of a comparator serves as an output of the first comparison circuit.

[Claim 6] The automatic charging circuit according to claim 2 or 5, wherein the second comparison circuit comprises a second comparator, a fourth resistor, a fifth resistor, and a second diode, wherein: The inverting input terminal of the second comparator serves as a negative input terminal of the second comparison circuit, and the non-inverting input terminal of the second comparator is connected to the reference voltage and one end of the fourth resistor, the fourth resistor The other end of the second diode is connected to the anode of the second diode, the cathode of the second diode is connected to the output end of the second comparator, and the fifth resistor is connected to the output end of the second comparator Between the charging interface and the charging interface, an output of the second comparator serves as an output of the comparison module.

[Claim 7] The automatic charging circuit according to claim 1, wherein the reference voltage circuit comprises a controllable precision voltage regulator source and a sixth resistor, and the anode base of the controllable precision voltage regulator source The cathode of the controllable precision voltage regulator is connected to the charging interface through the sixth resistor, and the reference pole of the controllable precision voltage regulator is connected to the cathode and provides the reference voltage.

[Claim 8] The automatic charging circuit according to claim 1, wherein the sampling circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, and a third diode, wherein One end of the seventh resistor is connected to the negative pole of the battery, the other end is connected to the anode of the third diode, and is grounded through the eighth resistor, and the anode of the third diode passes through the ninth resistor Grounding is also grounded through the third capacitor, and an anode of the third diode outputs the sampling voltage.

[Claim 9] An emergency light fixture comprising a battery and a light source, characterized by further comprising the automatic charging circuit according to any one of claims 1 to 8.