Emergency constant-power control circuit without light modulation

Abstract

The utility model discloses an emergency constant-power control circuit without a dimming wire. The emergency constant-power control circuit comprises a rectification main circuit, an output voltage acquisition circuit, an output control circuit, an output current detection circuit, a voltage detection circuit and a switching circuit, the rectification main circuit is used for providing a stable direct-current power supply for the illumination lamp; the corresponding end of the output voltage acquisition circuit is electrically connected with the corresponding end of the rectification main circuit, and the output voltage acquisition circuit is used for acquiring the voltage processed by the rectification main circuit and converting the voltage into 0-5V analog voltage for voltage monitoring; the corresponding end of the output control circuit is electrically connected with the corresponding ends of the output voltage acquisition circuit, the output current detection circuit, the voltage detection circuit and the mos tube switching circuit. The output control circuit comprises a single-chip microcomputer and a PWM signal generator and is used for generating a PWM signal to control on and off of the switching circuit so as to adjust the power supply state of the lamp.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency lighting, in particular to an emergency constant power control circuit without dimming light. Background Art

[0002] Emergency lighting is an indispensable safety device in modern public and industrial buildings. It is closely related to personal safety and the overall safety of the building. In the face of fire or other emergencies, power outages, emergency lighting systems play a key role. It not only helps to evacuate people in an orderly manner and support fire rescue work, but also ensures that important production and work can continue, while providing the necessary lighting support for necessary operations and processing. Therefore, emergency lighting plays a vital role in the event of a disaster, providing the necessary safety for buildings and personnel. Most of the lighting fixtures in use today have dimming functions. The dimming equipment controls the brightness and output power of the lighting fixture by controlling the 0-10V dimming line of the lighting fixture. The power of traditional lighting fixtures is very large, but in an emergency, only part of the power is often needed to provide emergency lighting. When the traditional emergency power supply is combined with the lamp to form an emergency lighting system, the AC power of the mains needs to be connected to the emergency power supply, and the emergency power supply is then output to the lighting fixture. At the same time, the dimming line of the emergency power supply needs to be connected to the lighting fixture. In order to facilitate the installation of smart dimmers, many lamps on the market integrate the 12V auxiliary power supply and dimming + and dimming - in the base, which is convenient for external smart dimmers. However, when the emergency power supply needs to be connected, the wiring is very inconvenient. For hidden dimming lines, the dimming line needs to be externally led, and DIM- and DIM+ need to be additionally connected in addition to L, N, and neutral lines, making the wiring installation very complicated. The installation is very cumbersome and wastes wires and labor. In view of the above problems, an emergency constant power control circuit without dimming line is proposed and implemented to solve the above problems. Utility Model Content

[0003] In view of the problems existing in the prior art, the utility model provides an emergency constant power control circuit without dimming light.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0005] The utility model provides a non-dimming light emergency constant power control circuit, comprising: a rectifier main circuit, an output voltage acquisition circuit, an output control circuit, an output current detection circuit, a voltage detection circuit, and a switch circuit;

[0006] The main rectifier circuit is used to provide a stable DC power supply for the lighting fixture;

[0007] The corresponding end of the output voltage acquisition circuit is electrically connected to the corresponding end of the rectifier main circuit, and is used to collect the voltage processed by the rectifier main circuit and convert it into an analog voltage of 0-5V for voltage monitoring;

[0008] The corresponding ends of the output control circuit are electrically connected to the corresponding ends of the output voltage acquisition circuit, the output current detection circuit, the voltage detection circuit, and the MOS tube switch circuit respectively;

[0009] The output control circuit includes a single chip microcomputer and a PWM signal generator, which is used to generate a PWM signal to control the on and off of the switch circuit, thereby adjusting the power supply state of the lamp.

[0010] The main rectifier circuit includes: a rectifier bridge BD1, an electrolytic capacitor EC2, a transformer, a rectifier bridge BD2, an electrolytic capacitor EC3, a linear regulator U3, and a capacitor C7;

[0011] The AC input end of the rectifier bridge BD1 is electrically connected to pins 7 and 8 of the secondary side of the transformer, the positive electrode of the rectifier bridge BD1 is electrically connected to the positive electrode of the electrolytic capacitor EC2, the first end of the output voltage acquisition circuit, and Vout+, the negative electrode of the rectifier bridge BD1 is electrically connected to the negative electrode of the electrolytic capacitor EC2, the second end of the output voltage acquisition circuit, and the ground wire AGND, the AC input end of the rectifier bridge BD2 is electrically connected to pins 6 and 5 of the secondary side of the transformer, the positive electrode of the rectifier bridge BD2 is electrically connected to the positive electrode of the electrolytic capacitor EC3 and the input end of the linear regulator U3, the negative electrode of the rectifier bridge BD2 is electrically connected to the negative electrode of the electrolytic capacitor EC3, the negative electrode of the linear regulator U3 and the ground wire AGND, the output end of the linear regulator U3 is electrically connected to the first end of the capacitor C7, and the second end of the capacitor C7 is electrically connected to the ground wire AGND.

[0012] The output voltage acquisition circuit includes a resistor R10, a resistor R11, and a capacitor C6; the first end of the resistor R10 is electrically connected to the positive electrode of the rectifier bridge BD1, the first end of the resistor R11 is electrically connected to the negative electrode of the rectifier bridge BD1 and the first end of the capacitor C6, and the second end of the resistor R10 is electrically connected to the second end of the resistor R11, the second end of the capacitor C6, and the Voltage sampling end.

[0013] The MOS switch circuit includes a resistor R12, a resistor R13, a resistor R14, a MOS tube Q5, and a push-pull circuit composed of transistors Q3 and Q4, wherein the push-pull circuit is used to drive the MOS tube Q5; one end of the C level of the transistor Q3 is electrically connected to a 12V power supply, the B level of the transistor Q3, the B level of the transistor Q4 and PWM1 are electrically connected, the E level of the transistor Q3, the C level of the transistor Q4 and one end of the resistor R12 are electrically connected, the E level of the transistor Q4 is electrically connected to the ground line, one end of the resistor R12 is electrically connected to the G level of the MOS tube Q5 and the first end of the resistor R13, the second end of the resistor R13, the first end of the resistor R14 and the S level of the MOS tube Q5 are electrically connected, the second end of the resistor R14 is electrically connected to the ground line AGND, and the D level of the MOS tube Q5 is electrically connected to the Vout-end.

[0014] The model of the single chip microcomputer is CMS8S6990.

[0015] The output current detection circuit includes a capacitor C11, a resistor R18, a resistor R19, a resistor R20, and an operational amplifier U7. The output end of the operational amplifier U7 is electrically connected to the first end of the resistor R19, the first end of the resistor R18, the first end of the capacitor C11, and the Current ADC port, respectively. The non-inverting input end of the operational amplifier U7 is electrically connected to the Current Sampling current sampling end. The inverting input end of the operational amplifier U7 is electrically connected to the second end of the resistor R19 and the second end of the resistor R20, respectively. The output end Current ADC of the current detection circuit is electrically connected to the analog detection pin Current ADC of the single-chip computer CMS8S6990.

[0016] The voltage detection circuit is composed of a resistor R21, a resistor R22, and a capacitor C12. The first end of the resistor R21 is electrically connected to the Voltage sampling port, the second end of the resistor R21 is electrically connected to the first end of the resistor R22, the first end of the capacitor C12, and the Voltage ADC port, respectively. The second end of the resistor R22 and the other end of the capacitor C12 are electrically connected to AGND. The port voltage detection output port Voltage ADC is electrically connected to the analog detection pin Voltage ADC of the single-chip computer CMS8S6990.

[0017] The technical solution of the utility model has the following beneficial effects:

[0018] The utility model can reduce the wiring between the emergency power supply and the load lamps, and only needs to connect the power line to achieve constant power emergency output, which greatly reduces the material cost, is convenient to wire, greatly simplifies the wiring operation of the emergency power supply, saves labor costs, and is compatible with most power supplies with different power supply schemes on the market through a specific constant power adjustment method, so that when adding emergency power supplies to old projects, it is not necessary to replace all of them, saving project transformation costs. The rectifier main circuit of the utility model is used to increase the direct current of the battery to about 220V voltage through a DC-DC boost circuit, and is processed by a rectifier bridge and a filter capacitor to provide a stable direct current power supply for lighting lamps; the output voltage acquisition circuit is used to collect the voltage processed by the rectifier main circuit and convert it into an analog voltage of 0-5V for voltage monitoring; the output control circuit is used to generate a PWM signal to control the conduction and shutdown of the MOS tube, thereby adjusting the power supply state of the lamp; the output current detection circuit detects and amplifies the load current signal through a current sampling resistor and an operational amplifier, and provides the single-chip microcomputer with ADC sampling and processing to achieve precise control of the output current. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the control module of the utility model;

[0020] Figure 2 It is the principle diagram of the main current circuit and output voltage acquisition circuit of the utility model;

[0021] Figure 3 This is the principle diagram of the output current detection circuit of the utility model;

[0022] Figure 4 This is the principle diagram of the voltage detection circuit of the utility model;

[0023] Figure 5 This is the principle diagram of the output current detection circuit of the utility model;

[0024] Figure 6 The schematic diagram of the switch circuit of the utility model. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise expressly specified or limited, a first feature is “on” or “below” a second feature.

[0030] “Under” may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature being “above”, “above”, and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “under”, “below”, and “below” the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] Reference Figures 1 to 6 The utility model provides a non-dimming light emergency constant power control circuit, comprising: a rectifier main circuit 200, an output voltage acquisition circuit 300, an output control circuit 100, an output current detection circuit 500, a voltage detection circuit 400, and a switch circuit 600;

[0032] The main rectifier circuit 200 is used to provide a stable DC power supply for the lighting fixture. The corresponding end of the output voltage acquisition circuit is electrically connected to the corresponding end of the main rectifier circuit, and is used to collect the voltage processed by the main rectifier circuit and convert it into an analog voltage of 0-5V for voltage monitoring;

[0033] The corresponding ends of the output control circuit are electrically connected to the corresponding ends of the output voltage acquisition circuit, the output current detection circuit, the voltage detection circuit, and the MOS tube switch circuit respectively;

[0034] Reference Figure 2 The output control circuit includes a single-chip microcomputer and a PWM signal generator, which is used to generate a PWM signal to control the on and off of the switch circuit, thereby adjusting the power supply state of the lamp. The model of the single-chip microcomputer is CMS8S6990.

[0035] Reference Figure 3 The main rectifier circuit 200 is responsible for increasing the direct current of the battery to the required voltage level through the DC-DC boost circuit, and provides a stable direct current power supply for the lighting fixture through a rectifier bridge and capacitor filtering; the main rectifier circuit 200 includes: a rectifier bridge BD1, an electrolytic capacitor EC2, a transformer, a rectifier bridge BD2, an electrolytic capacitor EC3, a linear regulator U3, and a capacitor C7; the AC input end of the rectifier bridge BD1 is electrically connected to the secondary side pins 7 and 8 of the transformer, the positive electrode of the rectifier bridge BD1 is electrically connected to the positive electrode of the electrolytic capacitor EC2, the first end of the output voltage collection circuit, and Vout+, and the negative electrode of the rectifier bridge BD1 is electrically connected to the negative electrode of the electrolytic capacitor EC2, the output The second end of the output voltage collection circuit is electrically connected to the ground line AGND, the AC input end of the rectifier bridge BD2 is electrically connected to the 6th and 5th pins of the secondary side of the transformer, the positive electrode of the rectifier bridge BD2 is electrically connected to the positive electrode of the electrolytic capacitor EC3 and the input end of the linear regulator U3, the negative electrode of the rectifier bridge BD2 is electrically connected to the negative electrode of the electrolytic capacitor EC3, the negative electrode of the linear regulator U3 and the ground line AGND, the output end of the linear regulator U3 is electrically connected to the first end of the capacitor C7, and the second end of the capacitor C7 is electrically connected to the ground line AGND, wherein the electrolytic capacitor EC2 is used for filtering processing to convert the rectified fluctuating DC power into smooth DC power.

[0036] In this embodiment, the output voltage acquisition circuit 300 converts the high voltage into a lower voltage range suitable for analog monitoring through resistor voltage division and capacitor filtering, so as to monitor and control the output voltage. The output voltage acquisition circuit 300 includes a resistor R10, a resistor R11, and a capacitor C6; the first end of the resistor R10 is electrically connected to the positive electrode of the rectifier bridge BD1, the first end of the resistor R11 is electrically connected to the negative electrode of the rectifier bridge BD1 and the first end of the capacitor C6, and the second end of the resistor R10 is electrically connected to the second end of the resistor R11, the second end of the capacitor C6, and the voltage sampling end, wherein the resistor R10 and the resistor R11 are used to divide the voltage after the boost.

[0037] Reference Figure 4 The voltage detection circuit is composed of a resistor R21, a resistor R22, and a capacitor C12. The first end of the resistor R21 is electrically connected to the Voltage sampling voltage sampling port. The second end of the resistor R21 is electrically connected to the first end of the resistor R22, the first end of the capacitor C12, and the Voltage ADC port respectively. The second end of the resistor R22 and the other end of the capacitor C12 are electrically connected to AGND. The port voltage detection output port Voltage ADC is electrically connected to the analog detection pin Voltage ADC of the single-chip computer CMS8S6990.

[0038] Reference Figure 5 The output current detection circuit 500 detects the current flowing through the lamp through the current sampling resistor, and uses the operational amplifier to amplify the current signal for the single-chip microcomputer to perform ADC sampling and processing, so as to achieve precise control of the output current; the output current detection circuit 500 includes a capacitor C11, a resistor R18, a resistor R19, a resistor R20, and an operational amplifier U7, the output end of the operational amplifier U7 is electrically connected to the first end of the resistor R19, the first end of the resistor R18, the first end of the capacitor C11, and the Current ADC port, the non-inverting input end of the operational amplifier U7 is electrically connected to the Current Sampling current sampling end, the inverting input end of the operational amplifier U7 is electrically connected to the second end of the resistor R19 and the second end of the resistor R20, and the output end Current ADC of the current detection circuit is electrically connected to the analog detection pin Current ADC of the single-chip microcomputer CMS8S6990.

[0039] Reference Figure 6The switch circuit 600 includes a resistor R12, a resistor R13, a resistor R14, a MOS tube Q5, and a push-pull circuit composed of transistors Q3 and Q4, and the push-pull circuit is used to drive the MOS tube Q5; one end of the C-stage of the transistor Q3 is electrically connected to the 12V power supply, the B-stage of the transistor Q3, the B-stage of the transistor Q4 and PWM1 are electrically connected, the E-stage of the transistor Q3, the C-stage of the transistor Q4 and one end of the resistor R12 are electrically connected, the E-stage of the transistor Q4 is electrically connected to the ground line, one end of the resistor R12 is electrically connected to the G-stage of the MOS tube Q5 and the first end of the resistor R13, the second end of the resistor R13, the first end of the resistor R14 and the S-stage of the MOS tube Q5 are electrically connected, the second end of the resistor R14 is electrically connected to the ground line AGND, and the D-stage of the MOS tube Q5 is electrically connected to the Vout-end.

[0040] Working principle of this utility model:

[0041] When it is necessary to enter the emergency state, the microcontroller outputs PWM to control the MOS tube Q5 to turn on. At the same time, the current and voltage consumed by the load are calculated through the output voltage acquisition circuit and the output current detection circuit. The output power is calculated through the current and voltage of the load at startup. The current curve, voltage curve and load curve consumed from startup to subsequent stable operation are calculated to fit the next adjustment direction, calculate the power to be output, adjust the output duty cycle and output time, and continuously adjust the output duty cycle to stabilize the load output power, thereby achieving constant power emergency output.

[0042] The utility model can reduce the wiring between the emergency power supply and the load lamps, and only needs to connect the power line to achieve constant power emergency output, which greatly reduces the material cost, is convenient to wire, greatly simplifies the wiring operation of the emergency power supply, saves labor costs, and is compatible with most power supplies with different power supply schemes on the market through a specific constant power adjustment method, so that when adding emergency power supplies to old projects, it is not necessary to replace all of them, saving project transformation costs. The rectifier main circuit of the utility model is used to increase the direct current of the battery to about 220V voltage through a DC-DC boost circuit, and is processed by a rectifier bridge and a filter capacitor to provide a stable direct current power supply for lighting lamps; the output voltage acquisition circuit is used to collect the voltage processed by the rectifier main circuit and convert it into an analog voltage of 0-5V for voltage monitoring; the output control circuit is used to generate a PWM signal to control the conduction and shutdown of the MOS tube, thereby adjusting the power supply state of the lamp; the output current detection circuit detects and amplifies the load current signal through a current sampling resistor and an operational amplifier, and provides the single-chip microcomputer with ADC sampling and processing to achieve precise control of the output current.

[0043] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A non-dimming light emergency constant power control circuit, characterized in that: include: Rectification main circuit, output voltage acquisition circuit, output control circuit, output current detection circuit, voltage detection circuit, switching circuit; The main rectifier circuit is used to provide a stable DC power supply for the lighting fixture; The corresponding end of the output voltage acquisition circuit is electrically connected to the corresponding end of the rectifier main circuit, and is used to collect the voltage processed by the rectifier main circuit and convert it into an analog voltage of 0-5V for voltage monitoring; The corresponding ends of the output control circuit are electrically connected to the corresponding ends of the output voltage acquisition circuit, the output current detection circuit, the voltage detection circuit, and the MOS tube switch circuit respectively; The output control circuit includes a single chip microcomputer and a PWM signal generator, which is used to generate a PWM signal to control the on and off of the switch circuit, thereby adjusting the power supply state of the lamp.

2. The non-dimming light emergency constant power control circuit according to claim 1, characterized in that: The main rectifier circuit includes: a rectifier bridge BD1, an electrolytic capacitor EC2, a transformer, a rectifier bridge BD2, an electrolytic capacitor EC3, a linear regulator U3, and a capacitor C7; The AC input end of the rectifier bridge BD1 is electrically connected to pins 7 and 8 of the secondary side of the transformer, the positive electrode of the rectifier bridge BD1 is electrically connected to the positive electrode of the electrolytic capacitor EC2, the first end of the output voltage acquisition circuit, and Vout+, the negative electrode of the rectifier bridge BD1 is electrically connected to the negative electrode of the electrolytic capacitor EC2, the second end of the output voltage acquisition circuit, and the ground wire AGND, the AC input end of the rectifier bridge BD2 is electrically connected to pins 6 and 5 of the secondary side of the transformer, the positive electrode of the rectifier bridge BD2 is electrically connected to the positive electrode of the electrolytic capacitor EC3 and the input end of the linear regulator U3, the negative electrode of the rectifier bridge BD2 is electrically connected to the negative electrode of the electrolytic capacitor EC3, the negative electrode of the linear regulator U3 and the ground wire AGND, the output end of the linear regulator U3 is electrically connected to the first end of the capacitor C7, and the second end of the capacitor C7 is electrically connected to the ground wire AGND.

3. The non-dimming light emergency constant power control circuit according to claim 2, characterized in that: The output voltage acquisition circuit includes a resistor R10, a resistor R11, and a capacitor C6; the first end of the resistor R10 is electrically connected to the positive electrode of the rectifier bridge BD1, the first end of the resistor R11 is electrically connected to the negative electrode of the rectifier bridge BD1 and the first end of the capacitor C6, and the second end of the resistor R10 is electrically connected to the second end of the resistor R11 and the second end of the capacitor C6.

4. The non-dimming light emergency constant power control circuit according to claim 1, characterized in that: The switch circuit includes a resistor R12, a resistor R13, a resistor R14, a MOS tube Q5, and a push-pull circuit composed of transistors Q3 and Q4, and the push-pull circuit is used to drive the MOS tube Q5; one end of the C level of the transistor Q3 is electrically connected to the 12V power supply, the B level of the transistor Q3, the B level of the transistor Q4 and PWM1 are electrically connected, the E level of the transistor Q3, the C level of the transistor Q4, and one end of the resistor R12 are electrically connected, the E level of the transistor Q4 is electrically connected to the ground line, one end of the resistor R12 is electrically connected to the G pole of the MOS tube Q5 and the first end of the resistor R13, the second end of the resistor R13, the first end of the resistor R14 and the S level of the MOS tube Q5 are electrically connected, the second end of the resistor R14 is electrically connected to the ground line AGND, and the D level of the MOS tube Q5 is electrically connected to the Vout-end.

5. The non-dimming light emergency constant power control circuit according to claim 1, characterized in that: The model of the single chip microcomputer is CMS8S6990.

6. The non-dimming light emergency constant power control circuit according to claim 1, characterized in that: The output current detection circuit includes a capacitor C11, a resistor R18, a resistor R19, a resistor R20, and an operational amplifier U7. The output end of the operational amplifier U7 is electrically connected to the first end of the resistor R19, the first end of the resistor R18, the first end of the capacitor C11, and the Current ADC port, respectively. The inverting input end of the operational amplifier U7 is electrically connected to the second end of the resistor R19 and the second end of the resistor R20, respectively.

7. The non-dimming light emergency constant power control circuit according to claim 1, characterized in that: The voltage detection circuit is composed of a resistor R21, a resistor R22, and a capacitor C12. The second end of the resistor R21 is electrically connected to the first end of the resistor R22 and the first end of the capacitor C12 respectively. The second end of the resistor R22 and the other end of the capacitor C12 are electrically connected to AGND.

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