CN210629927U

CN210629927U - Constant current power supply based on silicon controlled rectifier adjusts luminance

Info

Publication number: CN210629927U
Application number: CN201921551169.0U
Authority: CN
Inventors: 刘伟
Original assignee: Shenzhen Deyue Photoelectric Co Ltd
Current assignee: Shenzhen Deyue Photoelectric Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-05-26
Anticipated expiration: 2029-09-18

Abstract

A constant current power supply based on silicon controlled rectifier is suitable for the power supply field; the problems of high cost, large size and inconvenient replacement and optimization of the conventional constant-current power supply for silicon controlled rectifier dimming are solved. The utility model relates to a constant current power supply based on silicon controlled rectifier adjusts luminance contains high integration high accuracy single-section linear LED constant current driver chip, driver chip mainly contains silicon controlled rectifier dimmer detection TRIAC, current sampling end CS, LED supply voltage detection feedback end VD, temperature regulation point RTH; the above parts are electrically connected.

Description

Constant current power supply based on silicon controlled rectifier adjusts luminance

Technical Field

A constant current power supply based on silicon controlled rectifier is suitable for the field of power supplies, in particular to the field of constant current power supplies.

Background

The existing LED lamp generally uses an isolation and non-isolation silicon controlled rectifier control scheme, and comprises an electrolytic capacitor, a transformer and other devices, so that the cost of the silicon controlled rectifier dimming scheme is greatly increased.

The isolation and non-isolation silicon controlled rectifier control scheme in the existing market enables the size requirement of a product on a control power supply to be greatly increased, and the miniaturization of the product structure and the great waste of data in the aspect of the product structure are limited.

The existing silicon controlled rectifier dimming scheme cannot be subjected to modularized replacement under the background of requirements due to overlarge size, and the later optimization and improvement of an LED lamp are greatly limited.

SUMMERY OF THE UTILITY MODEL

The technical problem is as follows: the constant current power supply to current silicon controlled rectifier adjust luminance is with high costs, bulky, inconvenient problem of changing the optimization, the utility model provides a solution.

The technical content is as follows: a constant current power supply based on silicon controlled rectifier dimming comprises a high-integration high-precision single-section linear LED constant current driving chip, wherein the driving chip mainly comprises a silicon controlled rectifier dimmer detection TRIAC, a current sampling end CS, an LED power supply voltage detection feedback end VD and a temperature regulation point RTH; the above parts are electrically connected.

Preferably, the TRIAC dimmer detects that the TRIAC is connected to the AC input terminal, and sets the drain current by detecting the input of the AC.

Preferably, the current sampling terminal CS is connected to an external resistor, and the current sampling terminal CS can accurately set the LED current through the external resistor.

Preferably, the LED power supply voltage detection feedback end VD is connected with the LED lamp, and the voltage of the output power supply end is regulated and controlled by detecting the voltage used by the LED lamp, so that the effects of voltage feedback control and voltage compensation are achieved.

Preferably, the temperature regulation RTH regulates and controls the temperature point by detecting the internal temperature of the driving chip, and the output current can be reduced when the temperature of the chip is too high according to the structure and the using environment of a product.

Preferably, the current sampling end CS is connected to the Rcs2, and the main power of the lamp is changed through the resistance change of the Rcs2, so that the power requirement of the LED lamp is met.

Preferably, the LED power supply voltage detection feedback terminals VD are electrically connected to Rvd1 and Rvd2, and the power supply terminal monitoring is changed through Rvd1 and Rvd2, and the function of circuit energy compensation is achieved.

The utility model has the beneficial effects that the utility model relates to a constant current power supply based on silicon controlled rectifier adjusts luminance, owing to adopted high integrated high accuracy single-section linear LED constant current driver chip, the constant current power supply who makes is small, with low costs, and its modular design is convenient for the change optimization in later stage.

Drawings

Fig. 1 is a structural view of the driving chip of the present invention.

Fig. 2 is a schematic diagram of the external circuit of the driving chip of the present invention.

Fig. 3 is a diagram of the external package size of the driving chip of the present invention.

Detailed Description

A constant current power supply based on silicon controlled rectifier dimming comprises a high-integration high-precision single-section linear LED constant current driving chip, wherein the driving chip mainly comprises a silicon controlled rectifier dimmer detection TRIAC, a current sampling end CS, an LED power supply voltage detection feedback end VD and a temperature regulation point RTH; the above parts are electrically connected. The thyristor dimmer detects the TRIAC and can realize good compatibility of the thyristor dimmer by setting the discharge current when the AC input end is connected with the thyristor dimmer. The current sampling end CS can accurately set the LED current through an external resistor, and the chip can reduce the loss of the chip and optimize the system efficiency by optimizing the input current under different input voltages. The LED power supply voltage detection feedback end VD adjusts and controls the voltage of the output power supply end by detecting the voltage used by the LED lamp so as to achieve the effects of voltage feedback control and voltage compensation. Preferably, the temperature regulation RTH regulates and controls the temperature point by detecting the internal temperature of the driving chip, and the output current can be reduced when the temperature of the chip is too high according to the structure and the using environment of a product. The current sampling end CS changes the main power of the lamp through the resistance value change of the Rcs2, so that the power requirement of the LED lamp is met. The LED power supply voltage detection feedback end VD changes the power supply end monitoring through Rvd1 and Rvd2, and plays a role in circuit energy compensation.

As shown in fig. 1, the internal structure of the driving chip of the present invention, VIN is a high voltage starting input terminal, and the AC high voltage starting prompt is detected, so that the chip breakdown caused by the sudden change of the AC input voltage can be effectively ensured; DRAIN is a DRAIN control end of a built-in MOS tube and plays a role in controlling the continuous on-off-on cyclic working requirement of the LED lamp; VCC is a chip power supply port, DC voltage is continuously supplied to the driving chip to work, VIN supplies power to the chip through an internal high-voltage JFET after the system is powered on, and the chip starts to work when VCC voltage reaches a starting voltage. The LED dimming circuit comprises a chip, a controlled tube dimmer, a chip pin, a chip, a single-section LED lamp string, a light dimming device and a control circuit, wherein the TRIAC, the CS1, the CS2 and the VD are chip low-voltage interfaces, the TRIAC is a detection port of the controlled tube dimmer, the chip detects whether input is provided with the dimmer through the TRIAC pin, when the chip detects the dimmer, the chip can automatically open a leakage current, the compatibility of the controlled silicon dimmer is improved, and the single-section LED lamp string can be synchronously dimmed. When the chip detects that no dimmer exists, the chip can close the discharge current, so that the loss is reduced, and the system efficiency is improved. The desired bleed current can be set by the resistance value of the CS1 pin. And VD is a power supply voltage detection feedback end for feeding back power supply voltage feedback and compensation.

As shown in fig. 2 the utility model discloses the outside electron schematic diagram of driver chip, VIN are high pressure start input end, interior 700V voltage value, start the back when the system high pressure, and VCC chip power supply port passes through the inside high-pressure JFET of VIN and supplies power for the chip, and after VCC voltage reached chip 16VDC starting voltage, the chip began to work, and C1 has the 50V 10UF paster electric capacity of the effect of continuous stable 16VDC for guaranteeing the VCC. Rcs2 is the main power, i.e. the power supply to the LED lamp current modulation resistor, and the lamp current required can be calculated by I _ LED — Vcs2/Rcs 2. Rcs1 is a leakage current control resistor, when the chip detects that there is a dimmer, the chip will automatically turn on the leakage current, the required leakage current can be set by the resistance value of CS1 pin, and the formula (I ═ Vcs1/(Rcs1+ Rcs2)) is used to calculate the required leakage current value. DRAIN is a built-in MOS tube DRAIN electrode, contains 500V withstand voltage, and has high-frequency switch switching, Vgs internal operation 250 uA. Rvd1 and Rvd2 provide support for VD reference feedback by changing the resistance of Rvd1 and Rvd2 to change the effect of VD voltage supply feedback and compensation. The Rth is an over-temperature adjusting function resistor, has an over-temperature adjusting function, gradually reduces output current when a driving power supply is overheated, thereby controls output power and temperature rise, and can realize chip overheating adjusting temperature point (when the Rth is suspended, the chip temperature point is 130 ℃, when the Rth is 150K, the chip temperature point is 118 ℃, when the Rth is 50K, the chip temperature point is 135 ℃, and when the Rth is grounded, the chip temperature point is 150 ℃).

Claims

1. The utility model provides a constant current power supply based on silicon controlled rectifier adjusts luminance which characterized in that: the LED constant current driving circuit comprises a high-integration high-precision single-section linear LED constant current driving chip, wherein the driving chip mainly comprises a silicon controlled rectifier dimmer detection TRIAC, a current sampling end CS, an LED power supply voltage detection feedback end VD and a temperature adjusting point RTH; the above parts are electrically connected.

2. The thyristor-based dimming constant-current power supply according to claim 1, wherein: the thyristor dimmer detects that the TRIAC is connected with the AC input end, and sets a leakage current by detecting the input of the AC.

3. The thyristor-based dimming constant-current power supply according to claim 1, wherein: the current sampling terminal CS is connected with an external resistor, and the current sampling terminal CS accurately sets the LED current through the external resistor.

4. The thyristor-based dimming constant-current power supply according to claim 1, wherein: the LED power supply voltage detection feedback end VD is connected with the LED lamp, and the voltage of the output power supply end is adjusted and controlled by detecting the voltage used by the LED lamp so as to achieve the effects of voltage feedback control and voltage compensation.

5. The thyristor-based dimming constant-current power supply according to claim 1, wherein: the current sampling end CS is connected with the Rcs2, and the main power of the lamp is changed through the resistance change of the Rcs2, so that the power requirement of the LED lamp is met.

6. The thyristor-based dimming constant-current power supply according to claim 1 or 4, wherein: the LED supply voltage detection feedback terminals VD are electrically connected with Rvd1 and Rvd2, the supply terminal monitoring is changed through Rvd1 and Rvd2, and the circuit energy compensation function is achieved.