Charging and discharging control circuit, detection control boost circuit and AC emergency fan lamp boost control circuit

Abstract

The utility model discloses a charge and discharge control circuit, a detection control boost circuit and an AC emergency fan lamp boost control circuit, and relates to the field of voltage regulation and control. The charge and discharge control circuit comprises a detection circuit, a charge and discharge management circuit, a discharge boost control circuit and an AND gate, the detection circuit generates a high-level detection signal if the alternating-current power grid is powered off when the alternating-current power grid needs to supply power; when the charging and discharging management circuit receives a high-level detection signal, if the energy storage element does not have undervoltage, a high-level low-voltage protection signal is generated; the AND gate generates an emergency opening signal according to the high-level detection signal and the high-level low-voltage protection signal; and when receiving the emergency starting signal, the discharge boost control circuit outputs a driving voltage duty ratio signal according to the detected discharge voltage of the energy storage element, so as to adjust the discharge voltage of the energy storage element and enable the discharge voltage to be output constantly. According to the invention, constant discharge voltage output of the energy storage element can be realized.

Description

Technical Field

[0001] This application relates to the field of voltage regulation, and particularly to a charge-discharge control circuit, a detection control boost circuit, and an AC emergency fan light boost control circuit. Background Art

[0002] Energy storage elements can provide electrical energy for loads and are currently widely used.

[0003] The discharge efficiency of energy storage elements is extremely high, close to 100%. However, the discharge voltage of the energy storage element is unstable during the discharge stage. For example, when the energy storage element is fully charged, the discharge voltage is 4.2V, and when the energy storage element is undercharged, the discharge voltage drops to 3V, resulting in an unfixed operating voltage of the load. The operating voltage of the load changes with the discharge voltage of the energy storage element.

[0004] Therefore, it is necessary to solve the problem of unstable discharge voltage of energy storage elements. Summary of the Utility Model

[0005] The purpose of this application is to provide a charge-discharge control circuit, a detection control boost circuit, and an AC emergency fan light boost control circuit, which can achieve a constant output of the discharge voltage of the energy storage element.

[0006] To achieve the above purpose, this application provides the following solutions:

[0007] In the first aspect, this application provides a charge-discharge control circuit, which includes: a detection circuit, a charge-discharge management circuit, a discharge boost control circuit, and an AND gate. The signal output terminal of the detection circuit is respectively connected to the signal input terminal of the charge-discharge management circuit and the first input terminal of the AND gate; the detection circuit is used to generate a high-level detection signal during the period when AC grid power supply is required and transmit it to the charge-discharge management circuit and the AND gate respectively if an AC grid power outage occurs; the voltage detection terminal of the charge-discharge management circuit is connected to the energy storage element, and the signal output terminal of the charge-discharge management circuit is connected to the second input terminal of the AND gate; the charge-discharge management circuit is used to generate a high-level low-voltage protection signal and transmit the high-level low-voltage protection signal to the AND gate if there is no under-voltage in the energy storage element when receiving the high-level detection signal; the output terminal of the AND gate is connected to the signal input terminal of the discharge boost control circuit; the AND gate is used to generate an emergency start signal according to the high-level detection signal and the high-level low-voltage protection signal and transmit it to the discharge boost control circuit; the voltage detection terminal of the discharge boost control circuit is connected to the energy storage element; the discharge boost control circuit is used to output a driving voltage duty cycle signal according to the detected discharge voltage of the energy storage element when receiving the emergency start signal to adjust the discharge voltage of the energy storage element so that the discharge voltage is constantly output.

[0008] In a second aspect, the present application provides a detection and control boost circuit, which includes: an energy storage element, a boost power circuit, and the above charge and discharge control circuit. The positive electrode of the energy storage element is respectively connected to the voltage detection terminal of the discharge boost control circuit in the charge and discharge control circuit and the first input terminal of the boost power circuit, and the negative electrode of the energy storage element is grounded; the second input terminal of the boost power circuit is connected to the signal output terminal of the discharge boost control circuit. The positive electrode of the energy storage element serves as an energy storage direct output node, and the output terminal of the boost power circuit serves as a constant voltage output node. The boost power circuit is used to adjust the discharge voltage of the energy storage element according to the drive voltage duty ratio signal output by the discharge boost control circuit, and output a constant discharge voltage.

[0009] In a third aspect, an AC emergency fan light boost control circuit includes: a control switch, a fan motor, a second NMOS power switch, a micro control unit, and the above detection and control boost circuit. The charge and discharge control circuit in the detection and control boost circuit is connected to the AC power grid through the control switch, the output terminal of the AND gate in the detection and control boost circuit is connected to the first signal input terminal of the micro control unit, and the constant voltage output node in the detection and control boost circuit is connected to the power supply terminal of the fan motor. The drain of the second NMOS power switch is connected to the control terminal of the fan motor, the gate of the second NMOS power switch is connected to the first signal output terminal of the micro control unit, and the source of the second NMOS power switch is grounded. The detection and control boost circuit is used to transmit the constant discharge voltage of the constant voltage output node to the fan motor to provide a constant working voltage for the fan motor. The micro control unit is used to receive the fan control signal after receiving the emergency start signal, and control the state of the fan motor through the second NMOS power switch.

[0010] According to the specific embodiments provided by the present application, the following technical effects are disclosed:

[0011] The present application provides a charge and discharge control circuit, a detection and control boost circuit, and an AC emergency fan light boost control circuit. During the period when AC power grid power supply is required, if an AC power grid power outage occurs, the detection circuit generates a high-level detection signal; when the charge and discharge management circuit receives the high-level detection signal, if the energy storage element does not have undervoltage, it generates a high-level low-voltage protection signal; when both the detection signal and the low-voltage protection signal are high level, the AND gate generates an emergency start signal and enters the emergency discharge mode, the energy storage element discharges, and at the same time the discharge boost control circuit adjusts the discharge voltage of the energy storage element to make the discharge voltage of the energy storage element output constantly.

[0012] The boost control circuit of the AC emergency fan light in this application transmits the constant discharge voltage of the energy storage element to the fan motor in the fan light, provides a constant working voltage for the fan motor, keeps the rotation speed of the fan motor constant, and ensures that the rotation speed of the motor is not affected by the voltage change of the energy storage element. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a schematic diagram of a charge-discharge control circuit in an embodiment of the present application;

[0015] Figure 2 It is a schematic diagram of a detection control boost circuit provided in an embodiment of the present application;

[0016] Figure 3 It is a schematic diagram of the boost control circuit of the AC emergency fan light provided in an embodiment of the present application.

[0017] Reference Numerals:

[0018] Control switch - 101, rectifier bridge - 102, first resistor - 103, second resistor - 104, second NMOS power switch - 105, main light source - 106, DC / DC constant voltage circuit - 110, voltage stabilizing circuit - 120, fan motor - 130, main light source drive circuit - 150, infrared receiving head - 160, emergency light source - 201, current limiting resistor - 202, third NMOS power switch - 203, fourth NMOS power switch - 204, micro control unit - 240, detection control boost circuit - 300, energy storage element - 301, first NMOS power switch - 302, power inductor - 303, freewheeling diode - 304, charge-discharge control circuit - 310, detection circuit - 311, charge-discharge management circuit - 312, AND gate - 314, discharge boost control circuit - 315. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0020] To make the above objects, features, and advantages of the present application more apparent and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 is an example of the charge and discharge control circuit 310. In an exemplary embodiment, as Figure 1 shown, a charge and discharge control circuit is provided, including: a detection circuit 311, a charge and discharge management circuit 312, a discharge boost control circuit 315, and an AND gate 314. The signal output terminal of the detection circuit 311 is respectively connected to the signal input terminal of the charge and discharge management circuit 312 and the first input terminal of the AND gate 314. The voltage detection terminal of the charge and discharge management circuit 312 is connected to the energy storage element 301, and the signal output terminal of the charge and discharge management circuit 312 is connected to the second input terminal of the AND gate 314. The output terminal of the AND gate 314 is connected to the signal input terminal of the discharge boost control circuit 315. The voltage detection terminal of the discharge boost control circuit 315 is connected to the energy storage element 301.

[0022] The detection circuit 311 is configured to generate a high-level detection signal during the period when AC grid power supply is required and transmit it to the charge and discharge management circuit 312 and the AND gate 314 respectively if an AC grid power outage occurs. The charge and discharge management circuit 312 is configured to generate a high-level low-voltage protection signal and transmit the high-level low-voltage protection signal to the AND gate 314 if the energy storage element 301 does not have an undervoltage when receiving the high-level detection signal. The AND gate 314 is configured to generate an emergency start signal based on the high-level detection signal and the high-level low-voltage protection signal and transmit it to the discharge boost control circuit 315. The discharge boost control circuit 315 is configured to output a drive voltage duty cycle signal according to the detected discharge voltage of the energy storage element 301 when receiving the emergency start signal to adjust the discharge voltage of the energy storage element 301 so that the discharge voltage is constantly output.

[0023] In another exemplary embodiment of the present application, the power input terminal of the charge and discharge management circuit 312 is used to input alternating current, and the power output terminal of the charge and discharge management circuit 312 is connected to the energy storage element 301. The detection circuit 311 is configured to generate a low-level detection signal during the period when AC grid power supply is required if the AC grid is normally powered. The charge and discharge management circuit 312 is configured to convert the alternating current into direct current to charge the energy storage element 301 when receiving the low-level detection signal and alternating current.

[0024] The charge and discharge control circuit 310 of the present application is divided into two modes: AC mode and emergency mode. In the AC mode, the alternating current of the AC grid is used to charge the energy storage element 301. In the emergency mode, the energy storage element 301 discharges, and the discharge voltage of the energy storage element 301 is constantly output.

[0025] Still referring to Figure 1, the input terminals of the detection circuit 311 are AC1K and AC2 respectively. The detection signal output from the signal output terminal of the detection circuit 311 to the charge and discharge management circuit 312 is ACON. The detection signal output from the signal output terminal of the detection circuit 311 to the AND gate 314 is EM. The low-voltage protection signal of the charge and discharge management circuit 312 is UVP. The signal output from the output terminal of the AND gate 314 is EMON. The emergency start signal output from the discharge boost control circuit 315 is DRV. Figure 1 In Figure 1 , GND represents ground, CV represents the constant voltage output node, and BAT represents the energy storage direct current node.

[0026] In the emergency mode, EMON is at a high level, starting the discharge boost control circuit 315 for closed-loop control to output DRV with an appropriate duty cycle. When exiting the emergency mode, EMON is at a low level, turning off the discharge boost control circuit 315 and making DRV zero.

[0027] During the period when AC grid power supply is required, the detection circuit 311 can output a high-level EM only when it detects an AC grid power outage. Under other conditions, EM is at a zero level. The two signals EM and UVP are jointly sent to the AND gate 314 for logical AND operation to output EMON. That is, only when both signals are high, EMON can be at a high level. A high-level EMON means that the system enters the emergency mode, and a low-level EMON means that the system does not allow the energy storage element 301 (such as a lithium battery) to discharge.

[0028] The main functions of the charge and discharge management circuit 312: charge the energy storage element 301 in the AC mode, with overcharge protection function; in the emergency mode, with over-discharge low-voltage protection function. When the energy storage element 301 is fully charged, the low-voltage protection signal UVP is at a high level. As long as the energy storage element 301 shows an under-voltage situation, the low-voltage protection signal UVP will change from a high level to a low level. The charge and discharge management circuit 312 involves conventional and mature circuit designs, which will not be elaborated here.

[0029] In another exemplary embodiment of the present application, during the charging stage of the charge and discharge management circuit 312 for the energy storage element 301, if the voltage difference between the power input terminal of the charge and discharge management circuit 312 and the positive electrode of the energy storage element 301 is less than the preset lower voltage difference threshold, the charging circuit in the charge and discharge management circuit 312 is a linear charging circuit; if the voltage difference between the power input terminal of the charge and discharge management circuit 312 and the positive electrode of the energy storage element 301 is greater than the preset upper voltage difference threshold, the charging circuit in the charge and discharge management circuit 312 is a switching buck charging circuit.

[0030] Taking a fan light using a lithium battery as the energy storage element 301 as an example, for a high-power emergency fan light, multiple lithium batteries can be used in parallel, and the charging current may reach more than 1A. This requires a high-efficiency charging scheme for the charge and discharge management circuit 312. In terms of charging efficiency and circuit complexity, the optimal charging energy source is the constant voltage output node CV. During the charging stage, if the voltage difference between the constant voltage output node CV and the energy storage direct output node BAT is small, for example, the voltage of CV is 5V and the highest voltage of BAT is 4.2V. With such a small voltage difference, the charging efficiency is high, the heat generation is small, and a low-cost linear charging circuit structure can be adopted. However, if the voltage difference between CV and BAT is large, for example, the voltage of CV is 12V (corresponding to a 12V BLDC motor) and the highest voltage of BAT is 4.2V, with a voltage difference of up to about 8V, only a high-efficiency switching buck charging circuit structure can be used.

[0031] Based on the same concept, the embodiment of the present application also provides a detection and control boost circuit 300 that utilizes the charge and discharge control circuit 310 involved above. In an exemplary embodiment, as Figure 2 shown, a detection and control boost circuit 300 is provided, which includes: an energy storage element 301, a boost power circuit, and the above-mentioned charge and discharge control circuit 310. The positive electrode of the energy storage element 301 is respectively connected to the voltage detection end of the discharge boost control circuit 315 in the charge and discharge control circuit 310 and the first input end of the boost power circuit, and the negative electrode of the energy storage element 301 is grounded; the second input end of the boost power circuit is connected to the signal output end of the discharge boost control circuit 315. The positive electrode of the energy storage element 301 serves as the energy storage direct output node, and the output end of the boost power circuit serves as the constant voltage output node. The boost power circuit is used to adjust the discharge voltage of the energy storage element 301 according to the driving voltage duty cycle signal output by the discharge boost control circuit 315 and output a constant discharge voltage.

[0032] The charge and discharge control circuit 310 automatically adjusts the duty cycle of the drive signal DRV of the boost power circuit to achieve closed-loop control of the constant voltage output.

[0033] Figure 2 The detection and charge and discharge circuit in

[0034] In another exemplary embodiment of the present application, the boost power circuit includes: a first NMOS power switch 302, a power inductor 303, and a freewheeling diode 304. The positive electrode of the energy storage element 301 is respectively connected to the voltage detection terminal of the discharge boost control circuit 315 in the charge and discharge control circuit 310 and one end of the power inductor 303, and the negative electrode of the energy storage element 301 is grounded. The drain of the first NMOS power switch 302 is respectively connected to the other end of the power inductor 303 and the positive electrode of the freewheeling diode 304. The gate of the first NMOS power switch 302 is connected to the signal output terminal of the discharge boost control circuit 315, and the source of the first NMOS power switch 302 is grounded; the negative electrode of the freewheeling diode 304 serves as the constant voltage output node. The first NMOS power switch 302 is configured to adjust the discharge voltage of the energy storage element 301 according to the driving voltage duty ratio signal output by the discharge boost control circuit 315, so that the discharge voltage is constantly output through the freewheeling diode 304.

[0035] Based on the same concept, the embodiment of the present application further provides an AC emergency fan light boost control circuit using the above-mentioned detection and control boost circuit 300. A fan light is an LED lamp that combines a fan and lighting. The fan light is internally provided with an energy storage element 301, and the fan light has two working modes: an AC mode and an emergency mode. It operates in the AC mode under the AC power state, has fan and lighting functions, and simultaneously charges the energy storage element 301; it operates in the emergency mode under the power outage state and can also provide basic lighting and fan requirements. In order to keep the rotation speed of the fan motor 130 constant in the emergency mode and not affected by the voltage change of the energy storage element 301, in an exemplary embodiment, as Figure 3 shown, an AC emergency fan light boost control circuit provided includes: a control switch 101, a fan motor 130, a second NMOS power switch 105, a micro control unit 240, and the above-mentioned detection and control boost circuit 300.

[0036] The charge and discharge control circuit 310 in the detection control boost circuit 300 is connected to the AC power grid via the control switch 101. The output terminal of the AND gate 314 in the detection control boost circuit 300 is connected to the first signal input terminal of the microcontroller unit 240. The constant voltage output node in the detection control boost circuit 300 is connected to the power supply terminal of the fan motor 130. The drain of the second NMOS power switch 105 is connected to the control terminal of the fan motor 130. The gate of the second NMOS power switch 105 is connected to the first signal output terminal of the microcontroller unit 240. The source of the second NMOS power switch 105 is grounded. The detection control boost circuit 300 is used to transmit the constant discharge voltage of the constant voltage output node to the fan motor 130 to provide a constant working voltage for the fan motor 130. The microcontroller unit 240 is used to receive the fan control signal after receiving the emergency start signal and control the state of the fan motor 130 through the second NMOS power switch 105.

[0037] The boost control circuit for the AC emergency fan light in this application transmits the constant discharge voltage of the energy storage element 301 to the fan motor 130 in the fan light, provides a constant working voltage for the fan motor 130, keeps the rotation speed of the fan motor 130 constant, and ensures that the motor speed is not affected by the voltage change of the energy storage element 301.

[0038] The detection circuit 311 is responsible for detecting the state of the AC power grid and the state of the control switch 101. Only when the AC power grid is in a power outage state and the control switch 101 is in a closed state can it output an EM high-level signal. Under other conditions, EM is at zero level.

[0039] Figure 3 The motor in it is the fan motor 130. The fan control signal received and output by the microcontroller unit 240 (Microcontroller Unit, MCU) is FAN. The MCU controls the state of the fan motor 130 through the second NMOS power switch 105, and this state can include speed regulation and timing control.

[0040] In another exemplary embodiment of this application, in order to meet the lighting requirements in the emergency mode, the boost control circuit for the AC emergency fan light further includes: an emergency light source 201, a current limiting resistor 202, a third NMOS power switch 203, and a fourth NMOS power switch 204.

[0041] The positive electrode of the emergency light source 201 is connected to the energy storage direct output node or the constant voltage output node in the detection and control boost circuit 300, and the negative electrode of the emergency light source 201 is connected to one end of the current limiting resistor 202; the drain of the third NMOS power switch 203 is connected to the other end of the current limiting resistor 202, the gate of the third NMOS power switch 203 is connected to the second signal output end of the micro control unit 240, and the source of the third NMOS power switch 203 is connected to the drain of the fourth NMOS power switch 204. The gate of the fourth NMOS power switch 204 is connected to the output end of the AND gate 314 in the detection and control boost circuit 300, and the source of the fourth NMOS power switch 204 is grounded. The emergency light source 201 is used to turn on when both the third NMOS power switch 203 and the fourth NMOS power switch 204 are closed. The detection and control boost circuit 300 is used to transmit the discharge voltage of the energy storage direct output node or the constant discharge voltage of the constant voltage output node to the emergency light source 201 to supply power to the emergency light source 201. The micro control unit 240 is used to receive the dimming infrared signal of the emergency light source 201 after receiving the emergency turn-on signal, and control the third NMOS power switch 203 to close according to the dimming infrared signal of the emergency light source 201. The fourth NMOS power switch 204 is used to close after receiving the emergency turn-on signal.

[0042] Figure 3 The dimming infrared signal of the emergency light source 201 received and output by the micro control unit 240 is DIM, and the micro control unit 240 realizes stepless adjustment of the brightness and color temperature of the emergency light source 201 according to DIM. When EMON is at a low level, the fourth NMOS power switch 204 is in an open state. At this time, regardless of the state of the dimming infrared signal DIM output by the MCU, the emergency light source 201 will not turn on. Only when both EMON and the dimming infrared signal DIM are at a high level, both the fourth NMOS power switch 204 and the third NMOS power switch 203 are closed, and the emergency light source 201 will turn on. This means that the emergency light source 201 is turned on under the logical AND control of the emergency mode turn-on signal and the dimming infrared signal DIM.

[0043] Exemplarily, the energy storage element 301 in the fan light is a lithium battery, and the fan motor 130 is a low-cost open-loop single-phase BLDC motor.

[0044] In another exemplary embodiment of the present application, in different motor application scenarios, Figure 3The configuration and connection method of the emergency light source 201 will also be different. If it is a 5V motor solution, multiple 3V LED lamp beads should be connected in parallel for the emergency light source 201. To improve efficiency, its positive pole should be connected to BAT instead of CV. If it is a 9V motor solution, multiple 9V LED lamp beads can be connected in parallel for the emergency light source 201 and directly connected to CV instead of BAT. Since CV is a 9V constant voltage node (constant voltage in both AC mode and emergency mode), the emergency light source 201 not only has high efficiency but also has relatively stable output luminous flux, providing a good user experience.

[0045] In another exemplary embodiment of the present application, the AC emergency fan light boost control circuit further includes: a rectifier bridge 102, a first resistor 103, a second resistor 104, a DC / DC constant voltage circuit 110, and a voltage stabilizing circuit 120. The first end of the rectifier bridge 102 is connected to the first AC power interface of the AC power grid through a control switch 101. The second end of the rectifier bridge 102 is respectively connected to the second AC power interface of the AC power grid, the detection control boost circuit 300, and one end of the first resistor 103. The third end of the rectifier bridge 102 is connected to one end of the second resistor 104 and then grounded. The fourth end of the rectifier bridge 102 is connected to the input end of the DC / DC constant voltage circuit 110. The output end of the DC / DC constant voltage circuit 110 is respectively connected to the constant voltage output node in the detection control boost circuit 300 and the input end of the voltage stabilizing circuit 120. The output end of the voltage stabilizing circuit 120 is connected to the power supply end of the micro control unit 240. The other end of the first resistor 103 is connected to the other end of the second resistor 104. The connection point of the other end of the first resistor 103 and the other end of the second resistor 104 is connected to the signal input end of the micro control unit 240.

[0046] The DC / DC constant voltage circuit 110 is used to provide a stable voltage for the fan motor 130 when the control switch 101 is closed and the AC power grid is normally powered, and supply power to the micro control unit 240 through the voltage stabilizing circuit 120. When the control switch 101 is closed, a periodic voltage signal appears at the signal input end of the micro control unit 240. When the control switch 101 is opened, the voltage at the signal input end of the micro control unit 240 is zero. The micro control unit 240 is used to judge the operation of the control switch 101 according to the voltage at the signal input end and generate a control signal corresponding to the operation.

[0047] The rectifier bridge 102 rectifies the alternating current into direct current. The rectifier bridge 102, the first resistor 103, the second resistor 104 cooperate with the detection circuit 311 to detect the state of the control switch 101. The micro control unit 240 can generate control signals corresponding to operations as follows: initially control the switch 101 to close, the MCU generates a control signal to turn on the main light source 106 and a control signal to turn off the fan motor 130; control the switch 101 to disconnect, and then close it within 5 seconds, the MCU generates a control signal to turn off the main light source 106 and a control signal to start the fan motor 130; control the switch 101 to disconnect again, and then close it within 5 seconds, the MCU generates a control signal to turn on the main light source 106 and at the same time a control signal to start the fan motor 130; control the switch 101 to disconnect, and then close it within 5 seconds, then loop from the beginning.

[0048] Exemplarily, the voltage stabilizing circuit 120 is Figure 3 the 5V voltage stabilizing circuit in. The DC / DC constant voltage circuit 110 provides a stable 9V or 12V voltage for the fan motor 130 and supplies power to the MCU through the 5V voltage stabilizing circuit. The voltage supplied by the 5V voltage stabilizing circuit to the MCU is VDD. The signal input end of the micro control unit 240 is the ACS node.

[0049] In another exemplary embodiment of the present application, the AC emergency fan light boost control circuit further includes: a main light source 106 and a main light source driving circuit 150. The power supply end of the main light source driving circuit 150 is connected to the fourth end of the rectifier bridge 102, the control end of the main light source driving circuit 150 is connected to the second signal output end of the micro control unit 240, and the driving end of the main light source driving circuit 150 is connected to the negative pole of the main light source 106; the positive pole of the main light source 106 is connected to the fourth end of the rectifier bridge 102. The micro control unit 240 is configured to receive the dimming infrared signal of the main light source 106 when the control switch 101 is closed and the AC power grid is normally powered, and adjust the brightness and color temperature of the main light source 106 through the main light source driving circuit 150.

[0050] Figure 3 HV between the power supply end of the main light source driving circuit 150 and the fourth end of the rectifier bridge 102 in represents the high-voltage node output by the rectifier bridge 102.

[0051] In another exemplary embodiment of the present application, still referring to Figure 3 , the AC emergency fan light boost control circuit further includes: an infrared receiving head 160. The infrared receiving head 160 receives the infrared signal from the remote control and generates an output signal IRIN to the MCU. After the MCU decodes IRIN, it then performs corresponding controls, such as turning on the light, turning off the light, stepless dimming, stepless color adjustment, turning on the fan, turning off the fan, etc.

[0052] For different states of the AC power grid and the control switch 101, the detection and control boost circuit 300 makes the following judgments.

[0053] 1) If the control switch 101 is in the off state, EMON is at a low level, and the lamp is in the off state; 2) If the control switch 101 is in the closed state and the AC power grid is normally powered, EMON is at a low level, and this signal is an emergency mode off signal. At this time, the control device is in the AC mode, and CV provides a charging current for the energy storage element 301 inside the detection and control boost circuit 300; 3) If the control switch 101 is in the closed state and the AC power grid is powered off at the same time, EMON is at a high level. At this time, the detection and control boost circuit 300 is in the emergency mode. It can be seen that when it is detected that the power grid is in a power-off state, the control switch 101 is closed, and the energy storage element 301 is fully charged, a high-level EMON is generated. Under other conditions, EMON is at a low level.

[0054] After entering the emergency mode, if it is detected that the power grid is normally powered and the control switch 101 is closed, the charge and discharge control circuit 310 generates a low-level EMON, that is, an emergency mode off signal.

[0055] The core of the AC emergency fan light boost control circuit of this application is the detection and control boost circuit 300, which is built with a high-efficiency boost circuit and provides a constant working voltage for the motor during the emergency discharge stage to ensure that the motor speed is not affected by the change of the lithium battery voltage.

[0056] The advantages of this application are as follows:

[0057] First: During the emergency discharge stage, the energy storage element 301 discharges a constant voltage to the fan motor 130 through the discharge boost control circuit 315, so that the motor speed is constant during emergency discharge and is not affected by the lithium battery voltage, providing a good user experience.

[0058] Second: The lithium batteries are used in parallel, with low requirements for the performance of the lithium batteries, making it suitable for low-cost application scenarios.

[0059] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as these combinations of technical features do not conflict, they should be considered as the scope described in this specification.

[0060] In this article, specific examples are used to elaborate on the principle and implementation method of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A charge and discharge control circuit, characterized in that, The charge and discharge control circuit includes: a detection circuit, a charge and discharge management circuit, a discharge boost control circuit, and an AND gate; The signal output terminals of the detection circuit are respectively connected to the signal input terminals of the charge and discharge management circuit and the first input terminal of the AND gate; the detection circuit is configured to generate a high-level detection signal during the period when AC grid power supply is required and transmit it to the charge and discharge management circuit and the AND gate respectively if an AC grid power outage occurs; The voltage detection terminal of the charge and discharge management circuit is connected to the energy storage element, and the signal output terminal of the charge and discharge management circuit is connected to the second input terminal of the AND gate; the charge and discharge management circuit is configured to generate a high-level low-voltage protection signal and transmit the high-level low-voltage protection signal to the AND gate if the energy storage element does not have undervoltage when receiving the high-level detection signal; The output terminal of the AND gate is connected to the signal input terminal of the discharge boost control circuit; the AND gate is configured to generate an emergency start signal according to the high-level detection signal and the high-level low-voltage protection signal and transmit it to the discharge boost control circuit; The voltage detection terminal of the discharge boost control circuit is connected to the energy storage element; the discharge boost control circuit is configured to output a drive voltage duty ratio signal according to the detected discharge voltage of the energy storage element when receiving the emergency start signal to adjust the discharge voltage of the energy storage element so that the discharge voltage is constantly output.

2. The charge and discharge control circuit according to claim 1, wherein The power input terminal of the charge and discharge management circuit is used to input alternating current, and the power output terminal of the charge and discharge management circuit is connected to the energy storage element; The detection circuit is configured to generate a low-level detection signal during the period when AC grid power supply is required if the AC grid is normally powered; The charge and discharge management circuit is configured to convert the alternating current into direct current to charge the energy storage element when receiving the low-level detection signal and alternating current; 3. The charge and discharge control circuit according to claim 2, wherein During the charging stage of the energy storage element by the charge and discharge management circuit, if the voltage difference between the power input terminal of the charge and discharge management circuit and the positive electrode of the energy storage element is less than the preset lower threshold of the voltage difference, the charging circuit in the charge and discharge management circuit is a linear charging circuit; During the charging stage of the energy storage element by the charge and discharge management circuit, if the voltage difference between the power input terminal of the charge and discharge management circuit and the positive electrode of the energy storage element is greater than the preset upper threshold of the voltage difference, the charging circuit in the charge and discharge management circuit is a switching buck charging circuit.

4. A detection and control boost circuit, characterized in that, The detection control boost circuit includes: an energy storage element, a boost power circuit, and the charge and discharge control circuit according to any one of claims 1-3; The positive electrode of the energy storage element is respectively connected to the voltage detection terminal of the discharge boost control circuit in the charge and discharge control circuit and the first input terminal of the boost power circuit, and the negative electrode of the energy storage element is grounded; the second input terminal of the boost power circuit is connected to the signal output terminal of the discharge boost control circuit; The positive electrode of the energy storage element serves as an energy storage direct output node, and the output terminal of the boost power circuit serves as a constant voltage output node; The boost power circuit is configured to adjust the discharge voltage of the energy storage element according to the drive voltage duty ratio signal output by the discharge boost control circuit and output a constant discharge voltage.

5. The detection control boost circuit according to claim 4, characterized in that, The boost power circuit includes: a first NMOS power switch, a power inductor, and a freewheeling diode; The positive electrode of the energy storage element is respectively connected to the voltage detection terminal of the discharge boost control circuit and one end of the power inductor in the charge-discharge control circuit, and the negative electrode of the energy storage element is grounded; The drain of the first NMOS power switch is respectively connected to the other end of the power inductor and the positive electrode of the freewheeling diode. The gate of the first NMOS power switch is connected to the signal output terminal of the discharge boost control circuit, and the source of the first NMOS power switch is grounded; the negative electrode of the freewheeling diode serves as the constant voltage output node; The first NMOS power switch is used to adjust the discharge voltage of the energy storage element according to the drive voltage duty ratio signal output by the discharge boost control circuit, so that the discharge voltage is constantly output through the freewheeling diode.

6. An AC emergency fan light boost control circuit, characterized in that, The AC emergency fan light boost control circuit includes: a control switch, a fan motor, a second NMOS power switch, a micro control unit, and the detection control boost circuit described in claim 4; The charge-discharge control circuit in the detection control boost circuit is connected to the AC power grid through the control switch. The output terminal of the AND gate in the detection control boost circuit is connected to the first signal input terminal of the micro control unit. The constant voltage output node in the detection control boost circuit is connected to the power supply terminal of the fan motor; The drain of the second NMOS power switch is connected to the control terminal of the fan motor. The gate of the second NMOS power switch is connected to the first signal output terminal of the micro control unit, and the source of the second NMOS power switch is grounded; The detection control boost circuit is used to transmit the constant discharge voltage of the constant voltage output node to the fan motor to provide a constant working voltage for the fan motor; The micro control unit is used to receive the fan control signal after receiving the emergency start signal and control the state of the fan motor through the second NMOS power switch.

7. The boost control circuit for the AC emergency fan light according to claim 6, characterized in that, The AC emergency fan light boost control circuit further includes: an emergency light source, a current limiting resistor, a third NMOS power switch, and a fourth NMOS power switch; The positive electrode of the emergency light source is connected to the energy storage direct output node or the constant voltage output node in the detection control boost circuit. The negative electrode of the emergency light source is connected to one end of the current limiting resistor; the detection control boost circuit is used to transmit the discharge voltage of the energy storage direct output node or the constant discharge voltage of the constant voltage output node to the emergency light source to supply power to the emergency light source; The drain of the third NMOS power switch is connected to the other end of the current limiting resistor. The gate of the third NMOS power switch is connected to the second signal output terminal of the micro control unit. The source of the third NMOS power switch is connected to the drain of the fourth NMOS power switch; the micro control unit is used to receive the dimming infrared signal of the emergency light source after receiving the emergency start signal and control the third NMOS power switch to close according to the dimming infrared signal of the emergency light source; The gate of the fourth NMOS power switch is connected to the output terminal of the AND gate in the detection control boost circuit, and the source of the fourth NMOS power switch is grounded; the fourth NMOS power switch is used to close after receiving the emergency start signal; The emergency light source is used to turn on when both the third NMOS power switch and the fourth NMOS power switch are closed.

8. The boost control circuit for the AC emergency fan light according to claim 7, wherein, When the fan motor is a 5V motor, the emergency light source is multiple 3V LED lamp beads connected in parallel, and the anodes of the multiple 3V LED lamp beads are all connected to the energy storage direct amplification node; When the fan motor is a 9V motor, the emergency light source is multiple 9V LED lamp beads connected in parallel, and the anodes of the multiple 9V LED lamp beads are all connected to the constant voltage output node.

9. The boost control circuit of the AC emergency fan light according to claim 6, characterized in that, The AC emergency fan light boost control circuit further includes: a rectifier bridge, a first resistor, a second resistor, a DC / DC constant voltage circuit, and a voltage stabilizing circuit; The first end of the rectifier bridge is connected to the first AC power interface of the AC power grid through a control switch, the second end of the rectifier bridge is respectively connected to the second AC power interface of the AC power grid, the detection control boost circuit, and one end of the first resistor, the third end of the rectifier bridge is connected to one end of the second resistor and then grounded, and the fourth end of the rectifier bridge is connected to the input end of the DC / DC constant voltage circuit; The output end of the DC / DC constant voltage circuit is respectively connected to the constant voltage output node in the detection control boost circuit and the input end of the voltage stabilizing circuit; the output end of the voltage stabilizing circuit is connected to the power supply end of the micro control unit; the DC / DC constant voltage circuit is used to provide a stable voltage for the fan motor when the control switch is closed and the AC power grid is normally powered, and supply power to the micro control unit through the voltage stabilizing circuit; The other end of the first resistor is connected to the other end of the second resistor; the connection point of the other end of the first resistor and the other end of the second resistor is connected to the signal input end of the micro control unit; When the control switch is closed, a periodic voltage signal appears at the signal input end of the micro control unit; when the control switch is opened, the voltage at the signal input end of the micro control unit is zero; the micro control unit is used to judge the operation of the control switch according to the voltage at the signal input end and generate a control signal corresponding to the operation.

10. The boost control circuit for the AC emergency fan light according to claim 9, characterized in that, The AC emergency fan light boost control circuit further includes: a main light source and a main light source drive circuit; The power supply end of the main light source drive circuit is connected to the fourth end of the rectifier bridge, the control end of the main light source drive circuit is connected to the second signal output end of the micro control unit, and the drive end of the main light source drive circuit is connected to the cathode of the main light source; the anode of the main light source is connected to the fourth end of the rectifier bridge; The micro control unit is used to receive the dimming infrared signal of the main light source when the control switch is closed and the AC power grid is normally powered, and adjust the brightness and color temperature of the main light source through the main light source drive circuit.

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