Power supply circuit with zero standby power consumption

Abstract

The utility model discloses a power supply circuit with zero standby power consumption. The power supply circuit comprises an L line, an N line, a filter circuit, a fuse F1, an optical coupler U1, a current-limiting resistor R600, a signal ground SG, a silicon controlled rectifier SCR1, a rectifier bridge BD1, a surge suppression device TH1, a converter DC-TO-DC and a mainboard MB. The filter circuit is composed of a first filter circuit and a second filter circuit. A pin A1 and a pin A2 of the silicon controlled rectifier SCR1 are respectively connected with a first output end of the first filter circuit and the second filter circuit; according to the utility model, the silicon controlled rectifier SCR1 is arranged to switch on and switch off the whole power supply circuit, the silicon controlled rectifier SCR1 is switched on during normal work, and the connection between an L line and a subsequent load is directly cut off through the silicon controlled rectifier SCR1 when the silicon controlled rectifier SCR1 is switched off; the zero power consumption state in the standby mode is realized; and by utilizing the conduction characteristic of the silicon controlled rectifier SCR1 at a zero phase angle, no noise is generated during standby, and the service life is long.

Description

Technical Field

[0001] The utility model relates to a power supply circuit, in particular to a power supply circuit with zero-power standby. Background Art

[0002] At present, thermal power generation is still a commonly used power generation method. Thermal power generation can cause air pollution, energy depletion, and the greenhouse effect. Moreover, modern life uses a large number of electronic products and devices. The standby power consumption of these electronic products and devices when not working is <0.5W. Although the power consumption loss of a single device is very small, the sum of hundreds of millions of devices is already a huge number, resulting in a large energy loss.

[0003] Therefore, in order to reduce the power consumption of devices in standby mode, it is required that the power supply system enters the deep burst mode. However, in this operating mode, MLCC capacitors / electromagnetic components (such as PFC inductors or transformers, etc.) will generate audible high-frequency (EE noise) noise, especially at night when it is quiet, which makes people feel bad, and at the same time reduces the service life of the product. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a power supply circuit with zero-power standby to overcome the deficiencies of the prior art, realizing zero power consumption and no noise generation in the standby state, and having a long service life.

[0005] To achieve the above object, the technical solution adopted by the utility model is: a power supply circuit with zero-power standby, including: L wire, N wire, filtering circuit, fuse F1, optocoupler U1, current-limiting resistor R600, signal ground SG, thyristor SCR1, rectifier bridge BD1, surge suppression device TH1, converter DC-TO-DC, and main board MB;

[0006] The filtering circuit is composed of a first filtering circuit and a second filtering circuit;

[0007] The L wire is connected to the first input end of the first filtering circuit after passing through the fuse F1, and the N wire is connected to the second input end of the first filtering circuit;

[0008] The first output end and the second output end of the second filtering circuit are respectively connected to the first input end and the second input end of the rectifier bridge BD1; the first output end of the rectifier bridge BD1 is connected to the converter DC-TO-DC through the surge suppression device TH1; one output end of the converter DC-TO-DC is connected to the main board MB, and the other output end flows back to the second output end of the rectifier bridge BD1;

[0009] Pin 1 of the optocoupler U1 is connected to the signal terminal. Pins 2 and 3 of the optocoupler U1 are connected to the current-limiting resistor R600 and then connected to the signal ground SG. Pin 6 of the optocoupler U1 is connected to the G pin of the thyristor SCR1. Pin 4 of the optocoupler U1 is connected to the second filter circuit through the current-limiting resistor R102.

[0010] The A1 pin of the thyristor SCR1 is connected to the first output terminal of the first filter circuit. The A2 pin of the thyristor SCR1 is connected to the second filter circuit. And the A2 pin of the thyristor SCR1 and pin 4 of the optocoupler U1 are connected to the same input terminal of the second filter circuit.

[0011] The second output terminal of the first filter circuit is connected to the second input terminal of the second filter circuit.

[0012] Further, the first filter circuit includes a filter inductor LF1, capacitors CY1, CY2, and CX1. The capacitors CY1 and CY2 are connected in series. And the capacitor CY1 is connected to the first end of the filter inductor LF1, the capacitor CY2 is connected to the third end of the filter inductor LF1, and the capacitor CX1 is connected in parallel with the filter inductor LF1.

[0013] The second filter circuit includes a filter inductor LF2, capacitors CY3, CY4, and CX2. The capacitors CY3 and CY4 are connected in series. And the capacitor CY3 is connected to the first end of the filter inductor LF2, the capacitor CY4 is connected to the third end of the filter inductor LF2, and the capacitor CX2 is electrically connected to the filter inductor LF2.

[0014] Further, it also includes an X-capacitor discharge unit. The X-capacitor discharge unit includes a chip U4, resistors RX3, RX4, and RX5. Four pins on one side of the chip U4 are connected to the capacitor CX1 through the resistor RX3. Four pins on the other side of the chip U4 are connected to the fourth end of the filter inductor LF1 through the serially connected resistors RX4 and RX5.

[0015] Further, a zener diode ZD6 is also connected to pin 1 of the optocoupler U1.

[0016] Further, a varistor VAR1 is also provided between the L line and the N line.

[0017] Further, it also includes a resistor R101 and a capacitor C3 connected in series between the A1 pin and the A2 pin of the thyristor SCR1.

[0018] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0019] For the power supply circuit with zero-power standby of the utility model, a thyristor SCR1 is set to conduct the disconnection and closure of the entire power supply circuit. When working normally, the thyristor SCR1 is closed, and when disconnected, the connection between the L line and the subsequent load is directly cut off through the thyristor SCR1, thus realizing the zero-power state in the standby mode; meanwhile, by utilizing the conduction characteristic of the thyristor SCR1 at the 0 phase angle, the input of a smaller surge current generates no noise, improving the service life and meeting the corresponding usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the utility model will be further described below in conjunction with the drawings:

[0021] Figure 1 is a schematic diagram of the power supply circuit of the utility model;

[0022] Figure 2 is Figure 1 an enlarged view of part F in

[0023] Figure 3 is a power consumption comparison diagram of the power supply circuit of the utility model and the existing power supply circuit in the standby state. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art to better understand the solution of this application, the technical solution in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0025] The utility model provides a power supply circuit with zero-power standby to solve the problem that in the prior art, a large number of electronic product devices have a power consumption of less than 0.5W in the standby mode, but the huge energy figure is generated when hundreds of millions of devices are added together, resulting in energy waste, but noise will be generated if the power consumption is reduced.

[0026] For the convenience of understanding, the specific process in the embodiments of this application will be described below. Please refer to Figures 1 to 2, a power supply circuit with zero-power standby in an embodiment of the present application, includes: an L wire, an N wire, a filtering circuit, a fuse F1, an optocoupler U1, a current-limiting resistor R600, a signal ground SG, a thyristor SCR1, a rectifier bridge BD1, a surge suppression device TH1, a converter DC-TO-DC, and a main board MB; the filtering circuit includes a first filtering circuit 10 and a second filtering circuit 11; the L wire is connected to the first input end of the first filtering circuit 10 after passing through the fuse F1, and the N wire is connected to the second input end of the first filtering circuit 10; the first output end and the second output end of the second filtering circuit 11 are respectively connected to the first input end and the second input end of the rectifier bridge BD1; the first output end of the rectifier bridge BD1 is connected to the converter DC-TO-DC through the surge suppression device TH1; one output end of the converter DC-TO-DC is connected to the main board MB, and the other output end flows back to the second output end of the rectifier bridge BD1.

[0027] The pin 1 of the optocoupler U1 is connected to a signal terminal, the pins 2 and 3 of the optocoupler U1 are connected to the current-limiting resistor R600 and then connected to the signal ground SG, and the pin 6 of the optocoupler U1 is connected to the G pin of the thyristor SCR1; the pin 4 of the optocoupler U1 is connected to the second filtering circuit 11 through a current-limiting resistor R102.

[0028] The A1 pin of the thyristor SCR1 is connected to the first output end of the first filtering circuit 10, the A2 pin of the thyristor SCR1 is connected to the second filtering circuit 11, and the A2 pin of the thyristor SCR1 and the pin 4 of the optocoupler U1 are connected to the same input end where the second filtering circuit 11 is connected.

[0029] Further, the first filtering circuit 10 includes a filtering inductor LF1, capacitors CY1, CY2, and CX1; there are a total of four ports 1, 2, 3, and 4 on the filtering inductor LF1, and the first end and the third end of the filtering inductor LF1 are respectively connected to the capacitors CY1 and CY2; the capacitors CY1 and CY2 are connected in series; both ends of the capacitor CY1 are connected in parallel with the filtering inductor LF1.

[0030] The second filtering circuit 11 includes a filtering inductor LF2, capacitors CY3, CY4, and CX2; the capacitors CY3 and CY4 are connected in series; there are also a total of four ports 1, 2, 3, and 4 on the filtering inductor LF2, and the first end and the third end of the filtering inductor LF2 are respectively connected to the capacitors CY3 and CY4; both ends of the capacitor CY2 are electrically connected to the filtering inductor LF2.

[0031] The above-mentioned first filtering circuit 10 and second filtering circuit 11 cooperate to filter out the ripple in the entire power supply circuit.

[0032] Further, it further includes an X-capacitor discharge unit; the X-capacitor discharge unit includes a chip U4, a resistor RX3, a resistor RX4, and a resistor RX5; four pins on one side of the chip U4 are connected to a capacitor CX1 through the resistor RX3, and the four pins on the other side of the chip U4 are connected to the fourth terminal of a filtering inductor LF1 through the serially arranged resistor RX4 and resistor RX5. The X-capacitor discharge unit automatically turns on the chip U4 when the AC power supply is interrupted, so that the energy stored in the capacitor CX1 is released through the resistor RX3, resistor RX4, and resistor RX5; when the AC power supply is applied, it automatically interrupts the chip U4 to block the discharge path of the X-capacitor, thereby reducing power loss and meeting the safety regulations.

[0033] Further, a voltage stabilizing diode ZD6 is also connected to the 1st pin of the optocoupler U1. The voltage stabilizing diode ZD6 can play a role in stabilizing the voltage in the circuit and protecting other electronic components from high voltage impacts.

[0034] Further, a varistor VAR1 is also provided between the L wire and the N wire to perform voltage clamping when the circuit withstands overvoltage and absorb excess current to protect sensitive devices.

[0035] Further, it further includes a serially arranged resistor R101 and capacitor C3 provided between the A1 pin and the A2 pin of the thyristor SCR1 for eliminating noise.

[0036] The current flow path in the present utility model is as follows:

[0037] The current enters from the L wire, flows through the fuse F1, then passes through the filtering inductor LF1 to reach point A, passes through the thyristor SCR1 from point A. When the thyristor SCR1 is in the conducting state, the A1 pin and the A2 pin are conducting, and the current reaches the filtering inductor LF2 after passing through point C and then enters the bridge rectifier BD1. The bridge rectifier BD1 rectifies the alternating current into direct current. Then the direct current passes through the surge suppression device TH1 and enters the DC-TO-DC converter, and then returns to the bridge rectifier BD1, and then sequentially passes through the filtering inductor LF2, passes through point B, the filtering inductor LF1, and the N wire to form a loop. Among them, when the AC alternating current is in the negative half cycle, the current is just the opposite.

[0038] Moreover, during the process of forming the loop, the DC-TO-DC converter outputs low-voltage direct current to the main board MB for the required voltage after internal isolation and step-down.

[0039] The specific working principle is described as follows:

[0040] I. Boot mode

[0041] When powered on, the main board provides a signal to supply 2.5V voltage / 5mA (typical value) to the optocoupler U1.

[0042] The current flows into the optocoupler U1 from pin 1 and out from pin 2, then passes through the current-limiting resistor R600 to the signal ground S.G. At this time, the diode inside the optocoupler U1 emits light, and the photosensitive triac is turned on by the light. After the 4th and 6th pins of the optocoupler U1 are conducted, the G pin of the thyristor SCR1 receives a trigger signal, and the A1 and A2 pins are conducted. In this way, the B / C voltage is equal to the A / B voltage, which is equal to the input AC voltage. The alternating current enters the bridge rectifier BD1, and the converter DC-TO-DC works to output DC power to supply the main board MB, outputting 12V (or 5V, or 3.3V, etc.) DC power to supply the main board, and the entire power supply circuit works.

[0043] II. Standby mode

[0044] When the signal is lost during shutdown, the photosensitive diode inside the optocoupler U1 does not emit light, and the photosensitive triac inside the optocoupler U1 is cut off. The 4th and 6th pins of the optocoupler U1 are in an open state. At this time, the G pin of the thyristor SCR1 loses the trigger signal, and the A1 and A2 pins are in an open state. The voltage at the A / B point cannot pass through the A1-A2 pins of the thyristor SCR1, and there is no power at the B / C point. In this way, the bridge rectifier BD1 has no power, and then the circuit of the converter DC-TO-DC is turned off, and there is no 12V (or 5V, or 3.3V, etc.) DC output. Because the thyristor SCR1 directly cuts off the L line and there is no load and no consumption at the subsequent stage, and at the same time, the chip U4, resistors RX3, 4, 5 are in an open state, and there is no power consumption loss of components at the input end at this time. Therefore, zero power consumption is achieved in the standby mode, thus ensuring the use effect.

[0045] In summary, for the power supply circuit of the zero-power-consumption standby of the present utility model, by setting a thyristor SCR1 to conduct and cut off the entire power supply circuit, the thyristor SCR1 is closed during normal operation, and when it is cut off, the connection between the L line and the subsequent load is directly cut off through the thyristor SCR1, thus achieving a zero-power-consumption state in the standby mode; at the same time, by using the on-conduction characteristic of the thyristor SCR1 at the 0 phase angle, a small input surge current is generated without noise, meeting the actual use requirements.

[0046] Refer to Figure 3 , in actual use, compared with the power consumption generated by the existing power supply circuit in the standby state, the power consumption of this power supply circuit can be directly ignored, thus achieving the requirement of zero-power-consumption standby.

[0047] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A power supply circuit with zero-power standby, characterized in that, Including: L wire, N wire, filter circuit, fuse F1, optocoupler U1, current-limiting resistor R600, signal ground SG, thyristor SCR1, rectifier bridge BD1, surge suppression device TH1, converter DC-TO-DC and main board MB; The filter circuit consists of a first filter circuit and a second filter circuit; The L wire is connected to the first input terminal of the first filter circuit after passing through the fuse F1, and the N wire is connected to the second input terminal of the first filter circuit; The first output terminal and the second output terminal of the second filter circuit are respectively connected to the first input terminal and the second input terminal of the rectifier bridge BD1; the first output terminal of the rectifier bridge BD1 is connected to the converter DC-TO-DC through the surge suppression device TH1; one output terminal of the converter DC-TO-DC is connected to the main board MB, and the other output terminal returns to the second output terminal of the rectifier bridge BD1; Pin 1 of the optocoupler U1 is connected to the signal terminal, pins 2 and 3 of the optocoupler U1 are connected to the current-limiting resistor R600 and then connected to the signal ground SG, and pin 6 of the optocoupler U1 is connected to the G pin of the thyristor SCR1; pin 4 of the optocoupler U1 is connected to the second filter circuit through the current-limiting resistor R102; The A1 pin of the thyristor SCR1 is connected to the first output terminal of the first filter circuit, the A2 pin of the thyristor SCR1 is connected to the second filter circuit, and the A2 pin of the thyristor SCR1 and pin 4 of the optocoupler U1 are connected to the same input terminal where the second filter circuit is connected; The second output terminal of the first filter circuit is connected to the second input terminal of the second filter circuit.

2. The power supply circuit for zero-power standby as described in claim 1, wherein: The first filter circuit includes a filter inductor LF1, capacitors CY1, CY2 and CX1; the capacitors CY1 and CY2 are connected in series, and the capacitor CY1 is connected to the first end of the filter inductor LF1, the capacitor CY2 is connected to the third end of the filter inductor LF1, and the capacitor CX1 is connected in parallel with the filter inductor LF1; The second filter circuit includes a filter inductor LF2, capacitors CY3, CY4 and CX2; the capacitors CY3 and CY4 are connected in series, and the capacitor CY3 is connected to the first end of the filter inductor LF2, the capacitor CY4 is connected to the third end of the filter inductor LF2, and the capacitor CX2 is electrically connected to the filter inductor LF2.

3. The power supply circuit for zero-power standby according to claim 2, wherein: It also includes an X-capacitor discharge unit; the X-capacitor discharge unit includes a chip U4, resistors RX3, RX4 and RX5; four pins on one side of the chip U4 are connected to the capacitor CX1 through the resistor RX3, and four pins on the other side of the chip U4 are connected to the fourth end of the filter inductor LF1 through the resistors RX4 and RX5 connected in series.

4. The power supply circuit for zero-power standby according to claim 1, wherein: A zener diode ZD6 is also connected to pin 1 of the optocoupler U1.

5. The power supply circuit for zero-power standby according to claim 1, wherein: A varistor VAR1 is also provided between the L wire and the N wire.

6. The power supply circuit for zero-power standby according to claim 1, characterized in that: It also includes a resistor R101 and a capacitor C3 which are connected in series between the A1 pin and the A2 pin of the thyristor SCR1.

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