Low-voltage power supply circuit of non-switching power supply and DOB lamp

Abstract

The utility model discloses a low-voltage power supply circuit of a non-switching power supply and a DOB lamp. The circuit comprises a rectification circuit, a power supply module, a voltage acquisition circuit, a power supply control circuit, an energy storage module and a voltage stabilization module. The rectification circuit is connected with the voltage acquisition circuit and the power supply control circuit. The power supply module is respectively connected with the voltage acquisition circuit and the power supply control circuit; the voltage acquisition circuit is connected with the power supply control circuit and is used for transmitting two acquired voltage states to the power supply control circuit; the power supply control circuit is respectively connected with the energy storage module and the voltage stabilization module and is used for switching and controlling the energy storage module or the direct current to supply power to the voltage stabilization module according to the detection voltage and the reference sampling voltage; and the voltage stabilizing module is connected with the low-voltage power utilization module. According to the utility model, power can be directly taken from the high-voltage commercial power, the circuit loss is low, the power conversion efficiency is high, the circuit structure is simple, and the occupied space is small.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage power supply, in particular to a low-voltage power supply circuit of a non-switching power supply and a DOB lamp. Background Art

[0002] In the field of intelligent light engines, low-voltage power modules (such as MCU modules or Bluetooth modules) in current DOB products all require low-voltage electricity for power supply. However, when taking power directly from high-voltage mains, the step-down conversion efficiency is low, and the loss is very high when the current is slightly larger, which greatly affects the power conversion efficiency. The use of switching power supplies as low-voltage power supply modules has a complex structure, occupies a large space, and is accompanied by EM I problems, which affects the circuit stability and cannot meet the actual needs of users. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a low-voltage power supply circuit and a DOB lamp without a switching power supply, which can directly draw power from the high-voltage mains, have low circuit loss, high power conversion efficiency, simple circuit structure and small space occupation.

[0004] In order to solve the above technical problems, the utility model provides a low-voltage power supply circuit of a non-switching power supply, including a rectifier circuit, a power supply module, a voltage acquisition circuit, a power supply control circuit, an energy storage module and a voltage stabilizing module; the rectifier circuit is respectively connected to the voltage acquisition circuit and the power supply control circuit, and is used to convert the AC mains into DC power and adapt the power supply to the voltage acquisition circuit and the power supply control circuit; the power supply module is respectively connected to the voltage acquisition circuit and the power supply control circuit, and is used to output a sampling voltage and adapt the power supply to the voltage acquisition circuit and the power supply control circuit; the voltage acquisition circuit is connected to the power supply control circuit, and is used to respectively perform voltage acquisition on the sampling voltage and the DC voltage to obtain a detection voltage and a reference sampling voltage, and output them to the power supply control circuit; the power supply control circuit is respectively connected to the energy storage module and the voltage stabilizing module, and is used to switch and control the energy storage module or DC power to power the voltage stabilizing module according to the detection voltage and the reference sampling voltage; the voltage stabilizing module is connected to the low-voltage power module, and is used to perform a step-down conversion on the input voltage and adapt the power supply to the low-voltage power module.

[0005] As an improvement of the above scheme, the power supply control circuit includes an operational amplifier and a switch tube, the first end of the switch tube is connected to the output end of the rectifier circuit, and the second end of the switch tube is respectively connected to the energy storage module and the voltage stabilizing module; the positive input end and the reverse input end of the operational amplifier are respectively connected to the voltage acquisition circuit to respectively receive the detection voltage and the reference sampling voltage output by the voltage acquisition circuit; the power supply end of the operational amplifier is connected to the output end of the power supply module, and the ground end of the operational amplifier is grounded; the output end of the operational amplifier is connected to the control end of the switch tube, and is used to switch the on-off state of the switch tube according to the detection voltage and the reference sampling voltage.

[0006] As an improvement of the above scheme, the voltage acquisition circuit includes a first voltage acquisition circuit and a second voltage acquisition circuit; the input end of the first voltage acquisition circuit is connected to the output end of the rectifier circuit, the output end of the first voltage acquisition circuit is grounded, and the acquisition end of the first voltage acquisition circuit is connected to the reverse input end of the operational amplifier, for acquiring the DC voltage and outputting the detection voltage to the reverse input end of the operational amplifier; the input end of the second voltage acquisition circuit is connected to the output end of the power supply module, the output end of the second voltage acquisition circuit is grounded, and the acquisition end of the second voltage acquisition circuit is connected to the positive input end of the operational amplifier, for acquiring the sampled voltage and outputting the reference sampled voltage to the positive input end of the operational amplifier.

[0007] As an improvement of the above scheme, the first voltage acquisition circuit includes a first reference module and a second reference module; the first end of the first reference module is connected to the output end of the rectifier circuit, the first reference module is grounded via the second reference module, and the connection end between the first reference module and the second reference module is connected to the reverse input end of the operational amplifier.

[0008] As an improvement of the above scheme, the second voltage acquisition circuit includes a third reference module and a fourth reference module; the first end of the third reference module is connected to the output end of the power supply module, the third reference module is grounded via the fourth reference module, and the connection end between the third reference module and the fourth reference module is connected to the positive input end of the operational amplifier.

[0009] As an improvement of the above scheme, the rectifier circuit includes a rectifier bridge module, which includes a first diode, a second diode, a third diode and a fourth diode; the positive terminal of the first diode is respectively connected to the negative terminal of the second diode and the live wire end of the AC mains, and the negative terminal of the first diode is respectively connected to the voltage acquisition circuit, the power supply control circuit and the negative terminal of the third diode; the positive terminal of the third diode is respectively connected to the negative terminal of the fourth diode and the neutral wire end of the AC mains, and the positive terminal of the fourth diode is connected to the positive terminal of the second diode and grounded.

[0010] As an improvement of the above scheme, the rectifier circuit also includes a fifth diode, the positive terminal of the fifth diode is respectively connected to the negative terminal of the first diode, the negative terminal of the third diode and the voltage acquisition circuit, and the negative terminal of the fifth diode is connected to the power supply control circuit.

[0011] As an improvement of the above solution, the first voltage acquisition circuit further includes a sixth diode, and the sixth diode is connected in parallel with the second reference module.

[0012] As an improvement of the above solution, the power supply module includes an LDO power supply module.

[0013] The utility model also provides a DOB lamp, comprising a lamp body and the above-mentioned low-voltage power supply circuit of the non-switching power supply, wherein the low-voltage power supply circuit is arranged in the lamp body.

[0014] The beneficial effects of implementing the utility model are:

[0015] The utility model has a simple circuit structure, occupies a small space, and has a low cost. It can directly draw power from a high-voltage AC mains supply, and switches the energy storage module or the DC power to power the voltage stabilizing module by comparing the voltage between the input detection voltage and the reference sampling voltage, thereby adapting the power supply to the low-voltage power module. The circuit has good stability, low loss, and high power conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a low-voltage power supply circuit of a non-switching power supply of the utility model;

[0017] Figure 2 The utility model is a circuit structure diagram of a low-voltage power supply circuit of a non-switching power supply. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1As shown, a specific embodiment of the utility model provides a low-voltage power supply circuit of a non-switching power supply, including a rectifier circuit 1, a power supply module 2, a voltage acquisition circuit 3, a power supply control circuit 4, an energy storage module 5 and a voltage stabilizing module 6;

[0020] The rectifier circuit 1 is connected to the voltage acquisition circuit 3 and the power supply control circuit 4 respectively. When AC power is directly obtained from the external AC mains, the AC power is rectified by the rectifier circuit 1 to obtain DC power and adapt power supply to the voltage acquisition circuit 3 and the power supply control circuit 4; the power supply module 2 is connected to the voltage acquisition circuit 3 and the power supply control circuit 4 respectively, and is used to output a sampling voltage and adapt power supply to the voltage acquisition circuit 3 and the power supply control circuit 4; the voltage acquisition circuit 3 is connected to the power supply control circuit 4, and is used to respectively perform voltage acquisition on the sampling voltage and the DC voltage to obtain a detection voltage and a reference sampling voltage, and output them to the power supply control circuit 4.

[0021] The power supply control circuit 4 is connected to the energy storage module 5 and the voltage stabilizing module 6 respectively, and is used to switch and control the energy storage module 5 or direct current to supply power to the voltage stabilizing module 6 according to the detection voltage and the reference sampling voltage. The voltage stabilizing module 6 is connected to the low-voltage power module 7, and is used to step down the input voltage and adapt the power supply to the low-voltage power module 7.

[0022] During the AC cycle, the set reference sampling voltage is compared with the detection voltage of the rectified DC power. When the detection voltage is lower than the reference sampling voltage, the power supply control circuit 4 controls the DC power to supply power to the voltage stabilizing module 6 and charge the energy storage module 5; when the detection voltage is higher than the reference sampling voltage, the power supply control circuit 4 controls the electric energy stored in the energy storage module 5 to supply power to the voltage stabilizing module 6, without using an excessively high input voltage for power supply processing, thereby reducing circuit loss, and being able to achieve low-voltage electric energy to supply power to the voltage stabilizing module 6 during the entire AC cycle, so that the voltage stabilizing module 6 performs a voltage reduction conversion on the input voltage and adapts the power supply to the low-voltage power module 7, with high power conversion efficiency, so that the low-voltage power module 7 can be stably powered on; and the overall circuit structure is simple, occupies a small space, and has a low cost, which can meet the actual needs of users.

[0023] The following is a detailed description of the present invention in conjunction with a specific circuit diagram:

[0024] like Figure 2 As shown, Figure 2 The circuit structure diagram of the low-voltage power supply circuit of the non-switching power supply of the utility model is shown. The rectifier circuit 1, the voltage acquisition circuit 3 and the power supply control circuit 4 are described below respectively:

[0025] 1. Rectifier circuit 1

[0026] The rectifier circuit 1 includes a rectifier bridge module, which includes a first diode D1, a second diode D2, a third diode D5 and a fourth diode D3; the positive terminal of the first diode D1 is respectively connected to the negative terminal of the second diode D2 and the live wire end of the AC mains, the negative terminal of the first diode D1 is respectively connected to the voltage acquisition circuit 3, the power supply control circuit 4 and the negative terminal of the third diode D5; the positive terminal of the third diode D5 is respectively connected to the negative terminal of the fourth diode D3 and the neutral wire end of the AC mains, the positive terminal of the fourth diode D3 is connected to the positive terminal of the second diode D2 and is grounded. The input AC power is rectified and converted to obtain DC power by the set rectifier bridge module.

[0027] Preferably, the rectifier circuit 1 further includes a fifth diode D4, the positive terminal of the fifth diode D4 is respectively connected to the negative terminal of the first diode D1, the negative terminal of the third diode D5 and the voltage acquisition circuit 3, and the negative terminal of the fifth diode D4 is connected to the power supply control circuit 4. The fifth diode D4 is provided to withstand the pressure of reverse current flow, thereby protecting the rectifier bridge module from working normally.

[0028] 2. Voltage acquisition circuit 3

[0029] The voltage acquisition circuit 3 includes a first voltage acquisition circuit 31 and a second voltage acquisition circuit 32; the input end of the first voltage acquisition circuit 31 is connected to the connection end between the rectifier bridge module and the fifth diode D4, the output end of the first voltage acquisition circuit 31 is grounded, and the acquisition end of the first voltage acquisition circuit 31 is connected to the reverse input end of the operational amplifier U1, for acquiring the DC voltage and outputting the detection voltage to the reverse input end of the operational amplifier U1; the input end of the second voltage acquisition circuit 32 is connected to the output end of the power supply module 2, the output end of the second voltage acquisition circuit 32 is grounded, and the acquisition end of the second voltage acquisition circuit 32 is connected to the positive input end of the operational amplifier U1, for acquiring the sampled voltage and outputting the reference sampled voltage to the positive input end of the operational amplifier U1. The corresponding voltage acquisition is realized by setting the first voltage acquisition circuit 31 and the second voltage acquisition circuit 32, so as to control the energy storage module 5 or the DC voltage stabilization module U2 (i.e., the mark 6 in the figure) and the low-voltage power module 7 to work according to the voltage comparison situation.

[0030] Preferably, the power supply module 2 includes but is not limited to a low-power LDO power supply module, and may also be other power supply modules. The power supply module 2 outputs a VCC voltage to power the operational amplifier U1 and provide a sampling voltage required for voltage comparison. The LDO power supply module is a prior art, and its structure and working principle are not described in detail here.

[0031] Specifically, the first voltage acquisition circuit 31 includes a first reference module 311 and a second reference module 312; the first end of the first reference module 311 is connected to the output end of the rectifier circuit 1, the first reference module 311 is grounded via the second reference module 312, and the connection end between the first reference module 311 and the second reference module 312 is connected to the reverse input end of the operational amplifier U1. The input direct current is subjected to voltage division acquisition processing by the first reference module 311 and the second reference module 312 to obtain a detection voltage and output it to the reverse input end of the operational amplifier U1.

[0032] The first voltage acquisition circuit 31 further includes a sixth diode, which is connected in parallel with the second reference module 312 and is used to stabilize the detection voltage and improve signal acquisition stability.

[0033] The second voltage acquisition circuit 32 includes a third reference module 321 and a fourth reference module 322; the first end of the third reference module 321 is connected to the output end of the power supply module 2, the third reference module 321 is grounded via the fourth reference module 322, and the connection end between the third reference module 321 and the fourth reference module 322 is connected to the positive input end of the operational amplifier U1. The input sampling voltage is subjected to voltage division acquisition processing by the third reference module 321 and the fourth reference module 322 to obtain a reference sampling voltage and output it to the positive input end of the operational amplifier U1.

[0034] Preferably, the first reference module 311, the second reference module 312, the third reference module 321 and the fourth reference module 322 each include at least one reference resistor (such as R4, R3, R1 and R2). By changing the number and resistance of the reference resistors, the voltage of the detection voltage or the reference sampling voltage after voltage division collection can be changed, which has strong flexibility.

[0035] 3. Power supply control circuit 4

[0036] The power supply control circuit 4 includes a switch tube Q1 and a low-power operational amplifier U1, wherein the first end of the switch tube Q1 is connected to the output end of the rectifier circuit 1, and the second end of the switch tube Q1 is respectively connected to the energy storage module 5 and the voltage stabilizing module U2; the positive input end and the reverse input end of the operational amplifier U1 are respectively connected to the voltage acquisition circuit 3 to respectively receive the detection voltage and the reference sampling voltage output by the voltage acquisition circuit 3; the power supply end of the operational amplifier U1 is connected to the output end of the power supply module 2, and the ground end of the operational amplifier U1 is grounded; the output end of the operational amplifier U1 is connected to the control end of the switch tube Q1, and is used to switch the on-off state of the switch tube Q1 according to the detection voltage and the reference sampling voltage.

[0037] During the AC cycle, the operational amplifier U1 compares the set reference sampling voltage with the detection voltage of the rectified DC power. When the detection voltage is lower than the reference sampling voltage, the operational amplifier U1 outputs the corresponding control voltage to control the switch tube Q1 to conduct, so that the current DC power charges the energy storage module 5, and can also supply power to the voltage stabilizing module U2; when the detection voltage is higher than the reference sampling voltage, the operational amplifier U1 controls the switch tube Q1 to be disconnected, and at this time, the electric energy stored in the energy storage module 5 is used to supply power to the voltage stabilizing module U2, without using an excessively high input voltage for power supply processing, reducing circuit loss, and being able to achieve low-voltage electric energy to supply power to the voltage stabilizing module U2 throughout the AC cycle, so that the voltage stabilizing module U2 performs a voltage reduction conversion on the input voltage and adapts the power supply to the low-voltage power module 7, with high power conversion efficiency, so that the low-voltage power module 7 can be stably powered on; and the overall circuit structure is simple, occupies a small space, and has low cost, which can meet the actual needs of users.

[0038] Preferably, the switch tube Q1 is an NMOS tube, but this is not limited to it.

[0039] Preferably, the output end of the voltage stabilizing module U2 is also grounded via a capacitor C2. The voltage stabilizing module U2 is preferably LM7805CT, but is not limited thereto.

[0040] Preferably, the energy storage module 5 is preferably an energy storage capacitor C1, but is not limited thereto.

[0041] The utility model also provides a DOB lamp, comprising a lamp body and the above-mentioned low-voltage power supply circuit of the non-switching power supply, wherein the low-voltage power supply circuit is arranged in the lamp body. Since the above-mentioned low-voltage power supply circuit of the non-switching power supply has the above-mentioned technical effect, the COB lamp comprising the above-mentioned low-voltage power supply circuit of the non-switching power supply should also have the above-mentioned technical effect, which will not be described in detail here.

[0042] The above is a preferred embodiment of the present utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present utility model.

Claims

1. A low voltage power supply circuit of a non-switching power supply, characterized in that: It includes a rectifier circuit, a power supply module, a voltage acquisition circuit, a power supply control circuit, an energy storage module and a voltage stabilization module; The rectifier circuit is connected to the voltage collection circuit and the power supply control circuit respectively, and is used to convert the AC mains power into DC power and supply power to the voltage collection circuit and the power supply control circuit; The power supply module is connected to the voltage acquisition circuit and the power supply control circuit respectively, and is used to output the sampling voltage and adapt the power supply to the voltage acquisition circuit and the power supply control circuit; The voltage acquisition circuit is connected to the power supply control circuit, and is used to respectively acquire the sampled voltage and the DC voltage to obtain a detection voltage and a reference sampled voltage, and output them to the power supply control circuit; The power supply control circuit is connected to the energy storage module and the voltage stabilizing module respectively, and is used to switch and control the energy storage module or direct current to power the voltage stabilizing module according to the detection voltage and the reference sampling voltage; The voltage stabilizing module is connected to the low-voltage power module and is used to step down the input voltage and adapt the power supply to the low-voltage power module.

2. The low-voltage power supply circuit of the non-switching power supply according to claim 1, characterized in that: The power supply control circuit includes an operational amplifier and a switch tube, wherein a first end of the switch tube is connected to an output end of the rectifier circuit, and a second end of the switch tube is connected to the energy storage module and the voltage stabilizing module respectively; The positive input terminal and the negative input terminal of the operational amplifier are respectively connected to the voltage acquisition circuit to respectively receive the detection voltage and the reference sampling voltage output by the voltage acquisition circuit; The power supply end of the operational amplifier is connected to the output end of the power supply module, and the ground end of the operational amplifier is grounded; The output end of the operational amplifier is connected to the control end of the switch tube, and is used to switch and control the on-off state of the switch tube according to the detection voltage and the reference sampling voltage.

3. The low-voltage power supply circuit of the non-switching power supply according to claim 2, characterized in that: The voltage collection circuit includes a first voltage collection circuit and a second voltage collection circuit; The input end of the first voltage acquisition circuit is connected to the output end of the rectifier circuit, the output end of the first voltage acquisition circuit is grounded, and the acquisition end of the first voltage acquisition circuit is connected to the reverse input end of the operational amplifier, for acquiring the DC voltage and outputting the detection voltage to the reverse input end of the operational amplifier; The input end of the second voltage acquisition circuit is connected to the output end of the power supply module, the output end of the second voltage acquisition circuit is grounded, and the acquisition end of the second voltage acquisition circuit is connected to the positive input end of the operational amplifier, so as to acquire the sampling voltage and output a reference sampling voltage to the positive input end of the operational amplifier.

4. The low-voltage power supply circuit of the non-switching power supply according to claim 3, characterized in that: The first voltage acquisition circuit includes a first reference module and a second reference module; The first end of the first reference module is connected to the output end of the rectifier circuit, the first reference module is grounded via the second reference module, and the connection end between the first reference module and the second reference module is connected to the inverting input end of the operational amplifier.

5. The low-voltage power supply circuit of the non-switching power supply according to claim 3, characterized in that: The second voltage acquisition circuit includes a third reference module and a fourth reference module; The first end of the third reference module is connected to the output end of the power supply module, the third reference module is grounded via the fourth reference module, and the connection end between the third reference module and the fourth reference module is connected to the positive input end of the operational amplifier.

6. The low-voltage power supply circuit of the non-switching power supply according to claim 1, characterized in that: The rectifier circuit includes a rectifier bridge module, and the rectifier bridge module includes a first diode, a second diode, a third diode and a fourth diode; The positive terminal of the first diode is respectively connected to the negative terminal of the second diode and the live wire end of the AC mains, and the negative terminal of the first diode is respectively connected to the voltage acquisition circuit, the power supply control circuit and the negative terminal of the third diode; The positive terminal of the third diode is connected to the negative terminal of the fourth diode and the neutral terminal of the AC mains respectively, and the positive terminal of the fourth diode is connected to the positive terminal of the second diode and is grounded.

7. The low voltage power supply circuit of the non-switching power supply according to claim 6, characterized in that: The rectifier circuit also includes a fifth diode, the positive terminal of the fifth diode is respectively connected to the negative terminal of the first diode, the negative terminal of the third diode and the voltage acquisition circuit, and the negative terminal of the fifth diode is connected to the power supply control circuit.

8. The low-voltage power supply circuit of the non-switching power supply according to claim 4, characterized in that: The first voltage acquisition circuit further includes a sixth diode, and the sixth diode is connected in parallel with the second reference module.

9. The low-voltage power supply circuit of the non-switching power supply according to claim 1, characterized in that: The power supply module is an LDO power supply module.

10. A DOB lamp, characterized in that: The invention comprises a lamp body and a low-voltage power supply circuit of a non-switching power supply according to any one of claims 1 to 9, wherein the low-voltage power supply circuit is arranged in the lamp body.

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