Uninterrupted lighting circuit

Abstract

The utility model relates to an uninterrupted lighting circuit which comprises a system power supply and a standby power supply, the system power supply is connected with the anode of a first diode, the cathode of the first diode is respectively connected with one end of a capacitor, and the other end of the capacitor is grounded; the standby power supply is connected with the anode of the third diode. The cathode of the third diode is connected with the first resistor, the cathode of the voltage stabilizing diode and the source electrode of the MOS tube. The other end of the first resistor is connected with the second resistor; the anode of the Zener diode is connected with one end of the second resistor; the drain electrode of the MOS tube is connected with the anode of the second diode, and the grid electrode of the MOS tube is connected with one end of the second resistor; the cathode of the second diode is connected with one end of the capacitor; the capacitor is connected in parallel with the light-emitting diode and the third resistor. According to the utility model, the trend of a power supply loop is controlled through the voltage difference between the system power supply and the standby power supply, automatic switching and seamless butt joint are realized, and uninterruptability of a lighting circuit is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to an uninterrupted lighting circuit. BACKGROUND

[0002] In many scenarios, such as emergency rescue, power failure, outdoor exploration, etc., reliable uninterrupted lighting is needed. Traditional lighting devices may be affected by power supply interruption, etc., and cannot meet the needs of these special scenarios.

[0003] Therefore, an uninterrupted lighting circuit is provided. SUMMARY

[0004] The utility model aims at overcoming the defects of the prior art and providing an uninterrupted lighting circuit. The direction of the power supply loop is controlled by the voltage difference between the system power supply and the backup power supply, automatic switching is achieved, seamless docking is achieved, and uninterrupted lighting is ensured.

[0005] The technical scheme for achieving the above-mentioned purpose is as follows:

[0006] An uninterrupted lighting circuit comprises a system power supply and a backup power supply,

[0007] The anode of the first diode is connected to the system power supply, the cathode of the first diode is connected to one end of the capacitor, and the other end of the capacitor is grounded;

[0008] The anode of the third diode is connected to the backup power supply, the cathode of the third diode is connected to the cathode of the first resistor, the cathode of the voltage stabilizing diode, and the source of the MOS tube;

[0009] The other end of the first resistor is connected to the second resistor, and the other end of the second resistor is grounded;

[0010] The anode of the voltage stabilizing diode is connected to one end of the second resistor;

[0011] The drain of the MOS tube is connected to the anode of the second diode, and the gate of the MOS tube is connected to one end of the second resistor;

[0012] The cathode of the second diode is connected to one end of the capacitor;

[0013] The capacitor is connected in parallel with the light-emitting diode and the third resistor across the capacitor.

[0014] Preferably, when the system power supply is normally powered, the system power supply, the first diode, and the capacitor form a loop to supply power to the light-emitting diode.

[0015] Preferably, when the system power supply is normally powered, the potential of the system power supply is higher than that of the backup power supply, and the voltage V1 at the cathode end of the voltage stabilizing diode is lower than the voltage V2 at the anode end of the voltage stabilizing diode.

[0016] Preferably, when the standby power supply is powered, the standby power supply, the third diode, the MOS tube, the second diode and the capacitor form a loop to supply power to the light emitting diode.

[0017] Preferably, when the standby power supply is powered, the potential of the system power supply is higher than the standby power supply, and the voltage V1 of the cathode end of the stabilizing diode is higher than the voltage V2 of the anode end of the stabilizing diode.

[0018] The utility model discloses the beneficial effect is: the utility model circuit is simple, and the cost is less, and the use range is wide, can be applied to the power failure protection of most power supply, and the characteristics of the circuit are that the voltage difference of two power supplies is used to control the switching of different power supply loops, so that the system function power supply can be switched to the standby power supply in time and effectively in the case of abnormality or interruption, and the reverse flow of the system power supply is also prevented, and the reliability of circuit design is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the schematic diagram of the uninterrupted lighting circuit of the utility model. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be described clearly and completely in combination with the drawings. In the description of the utility model, it needs to be explained that the orientation or position relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying the importance of the opposite.

[0021] The utility model will be further described in combination with the drawings.

[0022] As Figure 1 shown, an uninterrupted lighting circuit comprises a system power supply U1 and a standby power supply U2,

[0023] The system power supply U1 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to one end of the capacitor EC1, and the other end of the capacitor EC1 is grounded.

[0024] The standby power supply U2 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the first resistor R1, the cathode of the stabilizing diode ZD1 and the source of the MOS tube Q1.

[0025] The other end of the first resistor R1 is connected to the second resistor R2, and the other end of the second resistor R2 is grounded.

[0026] The anode of the voltage stabilizing diode ZD1 is connected to one end of the second resistor R2.

[0027] The drain of the MOS transistor Q1 is connected to the anode of the second diode D2, and the gate of the MOS transistor Q1 is connected to one end of the second resistor R2.

[0028] The cathode of the second diode D2 is connected to one end of the capacitor EC1.

[0029] The light-emitting diode LED and the third resistor R3 are connected in parallel across the capacitor EC1.

[0030] In the embodiment, when the system power supply U1 is normally powered, the system power supply U1, the first diode D1, and the capacitor EC1 form a loop to supply power to the light-emitting diode LED.

[0031] In the embodiment, when the system power supply U1 is normally powered, the potential of the system power supply U1 is higher than that of the backup power supply U2, and the voltage V1 at the cathode end of the voltage stabilizing diode ZD1 is lower than the voltage V2 at the anode end of the voltage stabilizing diode ZD1.

[0032] In the embodiment, when the backup power supply U2 is powered, the backup power supply U2, the third diode D3, the MOS transistor Q1, the second diode D2, and the capacitor EC1 form a loop to supply power to the light-emitting diode LED.

[0033] In the embodiment, when the backup power supply U2 is powered, the potential of the system power supply U1 is higher than that of the backup power supply U2, and the voltage V1 at the cathode end of the voltage stabilizing diode ZD1 is higher than the voltage V2 at the anode end of the voltage stabilizing diode ZD1.

[0034] Working principle:

[0035] When the system power supply U1 is normally powered, the system power supply U1, the first diode D1, and the capacitor EC1 form a loop to light up the light-emitting diode LED; at this time, the voltage V1 at the cathode end of the voltage stabilizing diode ZD1 is lower than the voltage V2 at the anode end of the voltage stabilizing diode ZD1, the MOS transistor Q1 cannot be turned on, the backup power supply U2 cannot deliver energy to the light-emitting diode LED at the back end, and at the same time, due to the one-way conduction characteristic of the third diode D3, the system power supply U1 cannot also back-feeding current to the backup power supply U2, effectively protecting the backup power supply device.

[0036] When the system power U1 is powered off, the voltage V1 at the cathode end of the voltage stabilizing diode ZD1 is divided by the first resistor R1 and the second resistor R2, so that the voltage V2 at the anode end of the voltage stabilizing diode ZD1 is less than the voltage V1 at the cathode end of the voltage stabilizing diode ZD1, at this time, the MOS transistor Q1 is turned on, the standby power U2 forms a loop through the third diode D3, the MOS transistor Q1, the second diode D2 and the capacitor EC1, continuously supplies energy to the light emitting diode LED, and ensures uninterrupted lighting.

[0037] Due to the characteristics of the first diode D1, the standby power U2 cannot also reversely supply power to the system power U1, so that the energy of the standby power can be effectively saved, and the service life is prolonged.

[0038] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An uninterruptible lighting circuit, characterized by Comprising: system power supply (U1) and standby power supply (U2), the system power supply (U1) is connected to the anode of the first diode (D1), the cathode of the first diode (D1) is connected to one end of the capacitor (EC1) respectively, the other end of the capacitor (EC1) is grounded; the standby power supply (U2) is connected to the anode of the third diode (D3), the cathode of the third diode (D3) is connected to the first resistor (R1), the cathode of the voltage regulator diode (ZD1) and the source of the MOS tube (Q1) respectively; the other end of the first resistor (R1) is connected to the second resistor (R2), the other end of the second resistor (R2) is grounded; the anode of the voltage regulator diode (ZD1) is connected to one end of the second resistor (R2); the drain of the MOS tube (Q1) is connected to the anode of the second diode (D2), the gate of the MOS tube (Q1) is connected to one end of the second resistor (R2); the cathode of the second diode (D2) is connected to one end of the capacitor (EC1); the capacitor (EC1) is connected to the LED and the third resistor (R3) in parallel across the two ends.

2. An uninterruptible lighting circuit as claimed in claim 1, characterized in that When the system power supply (U1) is normally powered, the system power supply (U1), the first diode (D1) and the capacitor (EC1) form a loop to supply power to the LED.

3. An uninterruptible lighting circuit as claimed in claim 2, characterized in that When the system power supply (U1) is normally powered, the potential of the system power supply (U1) is higher than that of the standby power supply (U2), the voltage V1 at the cathode end of the voltage regulator diode (ZD1) is lower than the voltage V2 at the anode end of the voltage regulator diode (ZD1).

4. An uninterruptible lighting circuit as claimed in claim 1, characterized in that When the standby power supply (U2) is powered, the standby power supply (U2), the third diode (D3), the MOS tube (Q1), the second diode (D2) and the capacitor (EC1) form a loop to supply power to the LED.

5. An uninterruptible lighting circuit as claimed in claim 4, characterised in that, When the standby power supply (U2) is powered, the potential of the system power supply (U1) is higher than that of the standby power supply (U2), the voltage V1 at the cathode end of the voltage regulator diode (ZD1) is higher than the voltage V2 at the anode end of the voltage regulator diode (ZD1).

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