Power supply device for front-stage power supply and lamp
By using the boost circuit of the pre-stage power supply in the power supply device to stabilize and boost the power supply voltage, the problem of unstable power supply in the later stage affecting the boost chip is solved, and the effect of stable power supply and simplified wiring is achieved.
Patent Information
- Application Number
- CN202420537460.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-03-20
AI Technical Summary
In the power supply device of existing lamps, unstable power supply in the later stage will affect the power supply and operation of the booster chip, resulting in complex and unstable circuit wiring, affecting the regulation of the power supply voltage.
The power supply device with the pre-stage power supply is adopted. The input power supply voltage is stabilized through the boost circuit and the power supply voltage is directly output to the power supply control circuit. This solves the problem of unstable power supply in the later stage affecting the power supply stability of the boost chip and simplifies the Circuit wiring.
It realizes stable power supply of the boost chip, avoids the impact of unstable power supply in the later stage, simplifies circuit wiring, facilitates wiring connection, and the motherboard can use a single panel to meet the needs.
Smart Images
Figure CN222339638U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electronic technology, in particular to a front-stage power supply device and a lamp. Background Art
[0002] In the power supply device of the existing lamp, Figure 1 As shown, after the AC mains (L, N) is rectified and filtered by the input circuit, it is output to the power control circuit (composed of a chip model LZC3103 and its peripheral circuits, and a transformer) through the previous single winding T1. The power control circuit transmits the output voltage VOUT to power the LED lamp in one way, and outputs the PFCVCC voltage in the other way to power the previous boost circuit (composed of a boost chip and its peripheral circuits).
[0003] The boost chip in the boost circuit is preferably a high-power active power factor boost topology correction (PFC) controller of LZC6100. In order to meet the boot sequence requirements, the power supply of the front stage is set to come from the rear stage, that is, after the power control circuit of the rear stage works normally, the PFCVCC voltage is output to power the boost chip of the front stage. This places high demands on the power supply of the rear stage. If the power supply of the rear stage is unstable, it will affect the power supply and operation of the boost chip, thereby affecting the regulation of the power supply voltage. When wiring, the power supply line of the rear stage is wrapped around the front stage, making the wiring difficult and long, requiring the circuit board to use multiple panels, and also affecting the stability of the power supply. Utility Model Content
[0004] In view of the above technical problems, the embodiments of the present utility model provide a power supply device and a lamp with a front-stage power supply to solve the problem that the power supply stability of the boost chip is affected by the prior use of the rear-stage power supply to the front-stage.
[0005] The utility model provides a power supply device for front-stage power supply, including an input circuit and a power control circuit, the power control circuit is connected to an LED lamp, and further includes a boost circuit; the boost circuit is connected to the input circuit and the power control circuit;
[0006] The boost circuit stabilizes the power supply voltage transmitted by the input circuit to power itself, and also boosts the power supply voltage to output the supply voltage to the power control circuit. The power control circuit generates an output voltage based on the supply voltage to power the LED lamp.
[0007] Optionally, in the power supply device for the front-stage power supply, the boost circuit includes a boost chip, a transformer, a first diode, a second diode, a switch tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor;
[0008] The VCC pin of the boost chip is connected to the cathode of the first diode and the same-name end of the secondary winding of the transformer, the anode of the first diode is grounded, the opposite-name end of the secondary winding of the transformer is grounded, the opposite-name end of the primary winding of the transformer is connected to the output end of the input circuit, the same-name end of the primary winding of the transformer is connected to the anode of the second diode and the drain of the switch tube, the CMP pin of the boost chip is connected to one end of the first capacitor through the first resistor, the other end of the first capacitor and the GND pin of the boost chip are both grounded, the CS pin of the boost chip is connected to one end of the second resistor and the source of the switch tube, the FB pin of the boost chip is connected to one end of the third resistor and one end of the fourth resistor, the other end of the second resistor and the other end of the fourth resistor are both grounded, and the DRV pin of the boost chip is connected to the gate of the switch tube; the HV pin of the boost chip is connected to the cathode of the second diode, the other end of the third resistor and the power control circuit.
[0009] Optionally, in the power supply device of the front-stage power supply, the boost circuit also includes a third diode, a second capacitor and a third capacitor; the positive electrode of the third diode is connected to one end of the second capacitor, one end of the third capacitor and the opposite end of the primary winding of the transformer; the positive electrode of the third diode is connected to the other end of the third capacitor, the negative electrode of the second diode and the other end of the third resistor; the other end of the second capacitor is grounded.
[0010] Optionally, in the power supply device of the front-stage power supply, the boost circuit also includes a fifth resistor, a fourth diode and a fourth capacitor; the positive electrode of the fourth diode is connected to the same-name end of the secondary winding of the transformer through the fifth resistor, the negative electrode of the fourth diode is connected to one end of the fourth capacitor and the VCC pin of the boost chip, and the other end of the fourth capacitor is grounded.
[0011] Optionally, in the power supply device for the front-stage power supply, the boost circuit also includes a sixth resistor and a seventh resistor; one end of the sixth resistor is connected to the cathode of the second diode, and the other end of the sixth resistor is connected to the HV pin of the boost chip through the seventh resistor.
[0012] Optionally, in the power supply device of the front-stage power supply, the boost circuit also includes an eighth resistor, a ninth resistor and a fifth capacitor; one end of the eighth resistor is connected to the DRV pin of the boost chip, and the other end of the eighth resistor is connected to one end of the fifth capacitor, one end of the ninth resistor and the gate of the switching tube; the other end of the fifth capacitor is connected to the drain of the switching tube, and one end of the ninth resistor is connected to the source of the switching tube.
[0013] Optionally, in the power supply device of the front-stage power supply, the boost circuit also includes a tenth resistor, an eleventh resistor, a twelfth resistor and a sixth capacitor; one end of the tenth resistor is connected to the cathode of the second diode, the other end of the tenth resistor is connected to one end of the twelfth resistor through the eleventh resistor, the other end of the twelfth resistor is connected to the other end of the third resistor, and the sixth capacitor is connected in parallel with the fourth resistor.
[0014] Optionally, in the power supply device of the front-stage power supply, the boost circuit also includes a thirteenth resistor, a fourteenth resistor and a seventh capacitor; one end of the thirteenth resistor is connected to the CS pin of the boost chip and one end of the seventh capacitor, the other end of the seventh capacitor is grounded, the other end of the thirteenth resistor is connected to one end of the second resistor and the source of the switching tube, and the fourteenth resistor is connected in parallel with the second resistor.
[0015] The second aspect of the embodiment of the utility model provides a lamp, including a main board and an LED lamp, wherein the main board is provided with the power supply device for the front-stage power supply, and the power supply device for the front-stage power supply is connected to the LED lamp;
[0016] The power supply device of the front stage power supply rectifies and filters the AC mains power and then outputs a power supply voltage to power the boost circuit in the power supply device, and then converts the power supply voltage into an output voltage to power the LED lamp.
[0017] In the technical solution provided by the embodiment of the utility model, the power supply device of the front-stage power supply includes an input circuit, a power control circuit and a boost circuit; the boost circuit is connected to the input circuit and the power control circuit, and the power control circuit is connected to the LED lamp; the boost circuit stabilizes the power voltage transmitted by the input circuit and supplies power to itself, and also outputs the power supply voltage to the power control circuit after boosting the power supply voltage, and the power control circuit generates an output voltage according to the power supply voltage to supply power to the LED lamp. The existing rear-stage power supply is improved to the power supply of the front-stage power supply, and the power supply of the boost voltage is not affected by the instability of the rear-stage power supply, which solves the problem that the stability of the power supply of the boost chip is affected by the rear-stage power supply to the front-stage; and the wiring is more convenient without winding. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural block diagram of an existing power supply device.
[0019] Figure 2 This is a schematic diagram of the structure circuit of the power supply device for the front-stage power supply in the embodiment of the utility model. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The embodiments in the utility model and all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0021] See also Figure 2 The lamp provided by the embodiment of the utility model includes a mainboard arranged inside the lamp, and a power supply device for front-stage power supply is arranged on the mainboard, and the power supply device for front-stage power supply includes an existing input circuit, a power control circuit and a boost circuit 10 for front-stage power supply provided by this embodiment; the boost circuit 10 is connected to the input circuit and the power control circuit, and the power input circuit is connected to an LED lamp (which can be replaced with an LED light string, a light strip, a panel light, or a line light, etc. during specific implementation). The input circuit rectifies and filters the AC mains (connected to the AC mains through an interface) to achieve constant voltage and constant current, and then outputs a power supply voltage VLED; the boost circuit 10 stabilizes the power supply voltage VLED and then supplies power to itself, and also outputs a power supply voltage VCC to the power control circuit after boosting the power supply voltage VLED, and the power control circuit generates an output voltage VOUT according to the power supply voltage VCC to supply power to the LED lamp.
[0022] Among them, the input circuit and the power control circuit are prior art, and the pin or port of the power control circuit that previously output the PFCVCC voltage is no longer connected to the boost circuit; the pin and its corresponding device that generate the PFCVCC voltage in the power control circuit can be reserved or deleted, and other circuit structures in the power control circuit are not modified, and other functions remain unchanged. This embodiment mainly changes the power supply mode of the boost circuit, that is, the existing rear-stage power supply is improved to the front-stage power supply, and then the peripheral circuit is improved according to the power supply requirements of the boost chip in the boost circuit. The power supply of the boost voltage is not affected by the instability of the rear-stage power supply, which solves the problem that the existing rear-stage power supply to the front-stage affects the power supply stability of the boost chip; and the wiring is more convenient, without the need for winding.
[0023] like Figure 2As shown, the boost circuit includes a boost chip U, a transformer T, a first diode D1, a second diode D2, a switch tube Q, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first capacitor C1; the VCC pin of the boost chip U is connected to the cathode of the first diode D1 and the same-name end of the secondary winding of the transformer T, the anode of the first diode D1 is grounded, the opposite-name end of the secondary winding of the transformer T is grounded, the opposite-name end of the primary winding of the transformer T is connected to the output end of the input circuit (transmission power supply voltage VLED), and the same-name end of the primary winding of the transformer T is connected to the anode of the second diode D2 and the drain of the switch tube Q, the CMP pin of the boost chip U is connected to one end of the first capacitor C1 through the first resistor R1, the other end of the first capacitor C1 and the GND pin of the boost chip U are both grounded, the CS pin of the boost chip U is connected to one end of the second resistor R2 and the source of the switch tube Q, the FB pin of the boost chip U is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the second resistor R2 and the other end of the fourth resistor R4 are both grounded, the DRV pin of the boost chip U is connected to the gate of the switch tube Q; the HV pin of the boost chip U is connected to the cathode of the second diode D2, the other end of the third resistor R3 and the power control circuit.
[0024] Among them, the model of the boost chip U is preferably LZC6100 (active power factor correction (APFC) correction (PFC) controller with boost topology). R3 and R4 sample the power supply voltage VCC and feed it back to the FB pin, and the DRV pin outputs the corresponding high and low levels to control the conduction and cutoff of the switch tube Q, thereby controlling the voltage value of the power supply voltage VCC. R1 and C1 are used to compensate for the circuit time setting, R2 is used to set the power limit of this level and protect the circuit operation, and the second diode D2 is used for unidirectional conduction to prevent the power supply voltage VCC from backflowing. The switch tube Q is preferably an NMOS tube.
[0025] This embodiment mainly changes the power supply mode of the boost chip. The power supply voltage VLED is output through the secondary winding of the transformer T to the VCC pin of the boost chip, realizing the front-stage power supply mode. The first diode D1 plays the role of clamping and stabilizing the voltage. During the light-off process of the boost chip (i.e., the moment of shutdown), the limit voltage of the boost chip will not be exceeded, and the boost chip will not be damaged, thus realizing stable power supply. And the power supply is provided by the power supply voltage VLED output by the front stage, which is convenient for wiring. The mainboard can meet the wiring requirements by using a single panel without using multiple panels.
[0026] Preferably, the boost circuit further includes a third diode D3, a second capacitor C2 and a third capacitor C3; the positive electrode of the third diode D3 is connected to one end of the second capacitor C2, one end of the third capacitor C3 and the opposite end of the primary winding of the transformer T; the positive electrode of the third diode D3 is connected to the other end of the third capacitor C3, the negative electrode of the second diode D2 and the other end of the third resistor R3; the other end of the second capacitor C2 is grounded.
[0027] Among them, the functions of D3, C2 and C3 are that when D3 is used for power-on, the instantaneous current of power-on will not pass through D2 and the switch tube Q, thus protecting this part of the circuit. C3 is an EMC capacitor, which can be added mainly to ensure that the power supply radiation is not too strong at 60-100M. C2 is the filter capacitor of the boost chip, which protects the APFC from working.
[0028] Preferably, the boost circuit also includes a fifth resistor R5, a fourth diode D4 and a fourth capacitor C4; the positive electrode of the fourth diode D4 is connected to the same-name end of the secondary winding of the transformer T through the fifth resistor R5, the negative electrode of the fourth diode D4 is connected to one end of the fourth capacitor C4 and the VCC pin of the boost chip U, and the other end of the fourth capacitor C4 is grounded.
[0029] The auxiliary winding of R5, D4 and T realizes the function of providing stable power to the boost chip U through the inductor, ensuring stable operation of the boost chip U. The fourth capacitor C4 is used for filtering to make the power supply of the boost chip more stable.
[0030] Preferably, the boost circuit further includes a sixth resistor R6 and a seventh resistor R7; one end of the sixth resistor R6 is connected to the cathode of the second diode D2, and the other end of the sixth resistor R6 is connected to the HV pin of the boost chip U through the seventh resistor R7.
[0031] The resistance values of the sixth resistor R6 and the seventh resistor R7 are preferably 10KΩ, which are used to limit the current and prevent the high voltage from burning the boost chip.
[0032] Preferably, the boost circuit also includes an eighth resistor R8, a ninth resistor R9 and a fifth capacitor C5; one end of the eighth resistor R8 is connected to the DRV pin of the boost chip, and the other end of the eighth resistor R8 is connected to one end of the fifth capacitor C5, one end of the ninth resistor R9 and the gate of the switch tube Q; the other end of the fifth capacitor C5 is connected to the drain of the switch tube Q, and one end of the ninth resistor R9 is connected to the source of the switch tube Q.
[0033] Among them, the eighth resistor R8 is used for current limiting protection of the switch tube Q, and R9 is used to quickly discharge the voltage on the DRV pin when the boost chip U drives the DRV pin to turn off Q, so as to protect the DRV pin from being damaged by instantaneous voltage. C5 supplies power to the G pole through the D pole of the switch tube Q, which is mainly used when the boost chip U has insufficient driving capability and is driven quickly.
[0034] Preferably, the boost circuit also includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a sixth capacitor C6; one end of the tenth resistor R10 is connected to the cathode of the second diode D2, the other end of the tenth resistor R10 is connected to one end of the twelfth resistor R12 through the eleventh resistor R11, the other end of the twelfth resistor R12 is connected to the other end of the third resistor R3, and the sixth capacitor C6 is connected in parallel with the fourth resistor R4.
[0035] Among them, the resistance value of R10 is preferably 680KΩ, the resistance value of R11 is preferably 680KΩ, the resistance value of R12 is preferably 0KΩ, the resistance value of R3 is preferably 68KΩ, and the resistance value of R4 is preferably 12KΩ; its function is to control the output voltage of the boost chip and limit the output voltage according to the capacitor withstand voltage control requirement. The sixth capacitor C6 is used for filtering to make the sampled voltage value smoother and more stable, and to improve the on-off control accuracy of the switch tube.
[0036] Preferably, the boost circuit also includes a thirteenth resistor R13, a fourteenth resistor R14 and a seventh capacitor C7; one end of the thirteenth resistor R13 is connected to the CS pin of the boost chip U and one end of the seventh capacitor C7, the other end of the seventh capacitor C7 is grounded, the other end of the thirteenth resistor R13 is connected to one end of the second resistor R2 and the source of the switch tube Q, and the fourteenth resistor R14 is connected in parallel with the second resistor R2.
[0037] Among them, R13 and C7 form an RC filter to make the voltage on the CS pin smoother and more stable. Setting more resistors in parallel with R2 can achieve low temperature and will not reduce power or limit power after high temperature.
[0038] In summary, the power supply device and lamp with front-stage power supply provided by the utility model, the power supply voltage provided by the front-stage input circuit is output to the boost chip through the secondary winding of the transformer, thus realizing the front-stage power supply; combined with the clamping voltage stabilization function of the first diode, the boost chip is prevented from being damaged at the moment of shutdown, thus realizing stable power supply. In addition, the power supply is directly supplied by the front stage, which is convenient for wiring connection, and there is no need to go from the back to the front, thus shortening the wiring length. The mainboard can meet the wiring requirements by using a single panel, without the need to use multiple panels.
[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A power supply device for front-stage power supply, comprising an input circuit and a power control circuit, wherein the power control circuit is connected to an LED lamp, characterized in that: It also includes a boost circuit; the boost circuit is connected to the input circuit and the power supply control circuit; The boost circuit stabilizes the power supply voltage transmitted by the input circuit to power itself, and also boosts the power supply voltage to output the supply voltage to the power control circuit. The power control circuit generates an output voltage based on the supply voltage to power the LED lamp.
2. The power supply device for the front-stage power supply according to claim 1, characterized in that: The boost circuit includes a boost chip, a transformer, a first diode, a second diode, a switch tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor; The VCC pin of the boost chip is connected to the cathode of the first diode and the same-name end of the secondary winding of the transformer, the anode of the first diode is grounded, the opposite-name end of the secondary winding of the transformer is grounded, the opposite-name end of the primary winding of the transformer is connected to the output end of the input circuit, the same-name end of the primary winding of the transformer is connected to the anode of the second diode and the drain of the switch tube, the CMP pin of the boost chip is connected to one end of the first capacitor through the first resistor, the other end of the first capacitor and the GND pin of the boost chip are both grounded, the CS pin of the boost chip is connected to one end of the second resistor and the source of the switch tube, the FB pin of the boost chip is connected to one end of the third resistor and one end of the fourth resistor, the other end of the second resistor and the other end of the fourth resistor are both grounded, and the DRV pin of the boost chip is connected to the gate of the switch tube; the HV pin of the boost chip is connected to the cathode of the second diode, the other end of the third resistor and the power control circuit.
3. The power supply device for the front-stage power supply according to claim 2, characterized in that: The boost circuit also includes a third diode, a second capacitor and a third capacitor; the positive electrode of the third diode is connected to one end of the second capacitor, one end of the third capacitor and the opposite end of the primary winding of the transformer; the positive electrode of the third diode is connected to the other end of the third capacitor, the negative electrode of the second diode and the other end of the third resistor; the other end of the second capacitor is grounded.
4. The power supply device for the front-stage power supply according to claim 2, characterized in that: The boost circuit also includes a fifth resistor, a fourth diode and a fourth capacitor; the positive electrode of the fourth diode is connected to the same-name end of the secondary winding of the transformer through the fifth resistor, the negative electrode of the fourth diode is connected to one end of the fourth capacitor and the VCC pin of the boost chip, and the other end of the fourth capacitor is grounded.
5. The power supply device for the front-stage power supply according to claim 2, characterized in that: The boost circuit also includes a sixth resistor and a seventh resistor; one end of the sixth resistor is connected to the cathode of the second diode, and the other end of the sixth resistor is connected to the HV pin of the boost chip through the seventh resistor.
6. The power supply device for the front-stage power supply according to claim 2, characterized in that: The boost circuit also includes an eighth resistor, a ninth resistor and a fifth capacitor; one end of the eighth resistor is connected to the DRV pin of the boost chip, and the other end of the eighth resistor is connected to one end of the fifth capacitor, one end of the ninth resistor and the gate of the switch tube; the other end of the fifth capacitor is connected to the drain of the switch tube, and one end of the ninth resistor is connected to the source of the switch tube.
7. The power supply device for the front-stage power supply according to claim 2, characterized in that: The boost circuit also includes a tenth resistor, an eleventh resistor, a twelfth resistor and a sixth capacitor; one end of the tenth resistor is connected to the cathode of the second diode, the other end of the tenth resistor is connected to one end of the twelfth resistor through the eleventh resistor, the other end of the twelfth resistor is connected to the other end of the third resistor, and the sixth capacitor is connected in parallel with the fourth resistor.
8. The power supply device for the front-stage power supply according to claim 2, characterized in that: The boost circuit also includes a thirteenth resistor, a fourteenth resistor and a seventh capacitor; one end of the thirteenth resistor is connected to the CS pin of the boost chip and one end of the seventh capacitor, the other end of the seventh capacitor is grounded, the other end of the thirteenth resistor is connected to one end of the second resistor and the source of the switch tube, and the fourteenth resistor is connected in parallel with the second resistor.
9. A lamp, comprising a mainboard and an LED lamp, wherein the mainboard is provided with a front-stage power supply device as claimed in any one of claims 1 to 8, and the front-stage power supply device is connected to the LED lamp; The power supply device of the front stage power supply rectifies and filters the AC mains power and then outputs a power supply voltage to power the boost circuit in the power supply device, and then converts the power supply voltage into an output voltage to power the LED lamp.