Low-power-consumption power supply circuit

Abstract

The utility model relates to the technical field of circuit start control, and provides a low-power-consumption power supply circuit, which comprises a power management chip U2, and a quick start module, a self-recovery module and a switch module which are connected with the power management chip U2, when the input voltage is received, the second switch tube Q2 is conducted to charge the capacitor C1, and because the capacitance value of the capacitor C1 is relatively small, the capacitor C1 immediately supplies power to the power supply end VCC of the power management chip U2 after being quickly and fully charged, so that the power management chip U2 can be quickly started, the structure is simple, the number of components is small, the cost is low, the operation is reliable, and the effect of instant quick starting is achieved. Meanwhile, after the self-recovery module is started, the potential of the control end of the second switch tube Q2 is pulled down, so that the quick start circuit part can automatically stop energy consumption; an optocoupler U1 and a silicon controlled rectifier Q5 form an optocoupler isolation mechanism, so that signal interference and electrical impact are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit startup control, in particular to a low-power power supply circuit. Background Art

[0002] Switching power supplies have the advantages of small size and high conversion efficiency, and their application areas are constantly expanding, including chargers, adapters, etc. Startup time is an important parameter of switching power supplies, and more and more switching power supply users regard fast startup time as an important goal. Because it can start the motor in a shorter time, it reduces long-term high current loads and saves power consumption. However, the existing fast startup circuit often needs to continuously provide an enable signal to the power management chip U2, which will continue to consume energy during startup.

[0003] At the same time, in the shutdown control of the switching power supply, a single-chip microcomputer is generally used to control the disconnection of the switch tube. However, if this type of control method causes abnormal damage to the switch tube, the circuit will not be cut off normally, which will bring great hidden dangers to the safe operation of the equipment. Summary of the invention

[0004] The utility model provides a low-power consumption power supply circuit, which solves the technical problems of high energy consumption and low safety of the existing switch power supply circuit.

[0005] In order to solve the above technical problems, the utility model provides a low-power power supply circuit, including a power management chip U2 and a quick start module, a self-recovery module and a switch module connected thereto; the power supply end of the power management chip U2 is connected to the quick start circuit, the drive end is connected to the self-recovery module, and the signal end is connected to the switch module; the self-recovery module is also connected to the control end of the quick start module; the switch module is connected in series at the front end of the power supply main circuit of the power input.

[0006] In a further embodiment, the self-recovery module includes a signal receiving component and a recovery execution module, the signal receiving component is connected to the signal terminal of the power management chip U2, and is connected to the fast start module through the recovery execution module;

[0007] The signal receiving component includes a common-mode inductor L1, a diode D1, and a resistor R1. The positive phase coil of the common-mode inductor L1 is connected to the signal end of the power management chip U2, and the negative phase coil is connected to the positive electrode of the diode D1; the cathode of the diode D1 is connected to the recovery execution module; one end of the resistor R1 is connected to the positive electrode of the diode D1, and the other end is connected to the detection pin of the power management chip U2.

[0008] In a further implementation scheme, the recovery execution module includes a first switch tube Q1, a resistor R2, a resistor R3, a resistor R4, a diode D2 and a rectifier diode ZD1; the first end of the first switch tube is connected to the control end of the quick start module, the second end is grounded, and the control end is connected to the cathode of the diode D1 through the resistor R2; the two ends of the resistor R3 are respectively connected to the control end and the second end of the first switch tube Q1; the two ends of the resistor R4 are respectively connected to the first end and the second end of the first switch tube Q1; the positive electrode of the diode D2 is connected between the first end of the first switch tube and the control end of the quick start module, the negative electrode is connected to the cathode of the rectifier diode ZD1, and the positive electrode of the rectifier diode ZD1 is grounded.

[0009] In a further embodiment, the fast start module includes a second switch tube Q2, resistors R5 to R9 and a capacitor C1;

[0010] The second end of the second switch tube Q2 is connected to the input voltage through resistors R5 and R6, the first end is connected to the VCC end of the power management chip U2, the control end is connected to the recovery execution module, and the control end is also connected to the input voltage through resistors R7 to R9; one end of the capacitor C1 is connected to the first end of the second switch tube Q2, and the other end is grounded.

[0011] In a further embodiment, the utility model further includes an output module, the input end of the output module is connected to the signal end of the power management chip U2, and the output end is connected to the self-recovery module; the output module includes a third switch tube Q3, a resistor 10, a resistor R11, a resistor R12, a resistor R13, a diode D3 and a capacitor C2;

[0012] The control end of the third switch tube Q3 is connected to the signal end of the power management chip U2 through the resistor 10 and the resistor R11, the first end is grounded through the resistor R13, and the second end is connected to the self-recovery module as an output end; the two ends of the resistor R12 are respectively connected to the control end and the first end of the third switch tube Q3; the positive electrode of the diode D3 is connected to the control end of the third switch tube Q3, and the negative electrode is connected between the resistor 10 and the resistor R11; one end of the capacitor C2 is connected to the second end of the third switch tube Q3, and the other end is grounded.

[0013] In a further embodiment, the switch module includes an optocoupler isolation component and a switch component connected in sequence, and the optocoupler isolation component includes a fourth switch tube Q4, an optocoupler U1, a resistor 14, a resistor 15 and a resistor R16;

[0014] The first end of the fourth switch tube Q4 is connected to pin 2 of the optocoupler U1, the second end is grounded, and the control end is connected to the power management chip U2 through resistor 15; pin 1 of the optocoupler U1 is connected to the power supply terminal 5V through resistor 14, and its pins 4 and 6 are both connected to the switch component.

[0015] In a further implementation scheme, the switch component includes a thyristor Q5 and resistors 16 to R19; pins 2 and 1 of the thyristor are respectively connected to the two ends of the line access point at the front end of the main power supply circuit, and its pin 2 is also connected to pin 6 of the optocoupler U1 through resistors 16 and R17, and its pin 1 is also connected to pin 4 of the optocoupler U1 through resistors 18 and R19, and its pin 3 is connected to pin 4 of the optocoupler U1.

[0016] In a further embodiment, the first switch tube Q1 is a triode or a MOS tube.

[0017] The beneficial effects of the utility model are as follows:

[0018] (1) When receiving the input voltage, the second switch tube Q2 is turned on to charge the capacitor C1. Since the capacitance of the capacitor C1 is small, it is quickly charged and immediately supplies power to the power supply terminal VCC of the power management chip U2 so that it can start quickly. The structure is simple, the number of components is small, the cost is low, the operation is reliable, and the effect of instantaneous rapid startup is achieved.

[0019] (2) The output module is connected to the output end of the power management chip U2, and the signal is amplified through the switch tube, and then output to the signal receiving component, so that it drives the first switch tube Q1 in the recovery execution module to turn on, thereby lowering the gate voltage of the second switch tube Q2, and then turning off the MOS tube. Since the voltage is lower than the MOS tube, it cannot conduct, so the fast start circuit part will automatically stop consuming energy. It can improve the operating efficiency and stability of the equipment, reduce energy consumption and damage, and thus provide strong support and guarantee for modern production.

[0020] (3) An optocoupler isolation component is set to receive the switch signal to realize isolated signal transmission. The optocoupler U1 is used to convert the input signal into an optical signal for transmission, thereby avoiding signal interference and electrical shock.

[0021] At the same time, the electrical isolation of the switch control is realized. The control signal of the switching power supply can be isolated and transmitted through the optical coupler, avoiding the mutual influence between the switch control circuit and the controlled circuit, and improving the stability and reliability of the system.

[0022] (4) The thyristor installed on the front end of the power supply main circuit can control high power with low power, and has extremely fast response, opening and closing within microseconds. It operates without contact, sparks, or noise, has high efficiency, and low cost, and can effectively reduce the power consumption of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial hardware circuit diagram of a low-power power supply circuit provided by an embodiment of the utility model;

[0024] Figure 2 It is a partial hardware circuit diagram of a low-power power supply circuit provided by an embodiment of the utility model;

[0025] Figure 3 This is a partial hardware circuit diagram of a low-power power supply circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0026] The following is a detailed explanation of the implementation mode of the present invention in conjunction with the accompanying drawings. The embodiments are provided for illustrative purposes only and cannot be understood as limitations on the present invention. The accompanying drawings are provided for reference and illustration only and do not constitute limitations on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0027] The present invention provides a low power consumption power supply circuit. Figure 1 to Figure 3 As shown, in this embodiment, it includes a power management chip U2 and a quick start module, a self-recovery module and a switch module connected thereto; the power supply end of the power management chip U2 is connected to the quick start circuit, the drive end is connected to the self-recovery module, and the signal end is connected to the switch module; the self-recovery module is also connected to the control end of the quick start module; the switch module is connected in series at the front end of the power supply main circuit of the power input.

[0028] In this embodiment, the self-recovery module includes a signal receiving component and a recovery execution module, the signal receiving component is connected to the signal end of the power management chip U2, and is connected to the fast start module through the recovery execution module;

[0029] The signal receiving component includes a common-mode inductor L1, a diode D1, and a resistor R1. The positive phase coil of the common-mode inductor L1 is connected to the signal end of the power management chip U2, and the negative phase coil is connected to the positive pole of the diode D1; the negative pole of the diode D1 is connected to the recovery execution module; one end of the resistor R1 is connected to the positive pole of the diode D1, and the other end is connected to the detection pin of the power management chip U2.

[0030] In this embodiment, the recovery execution module includes a first switch tube Q1, a resistor R2, a resistor R3, a resistor R4, a diode D2 and a rectifier diode ZD1; the first end of the first switch tube is connected to the control end of the quick start module, the second end is grounded, and the control end is connected to the cathode of the diode D1 through the resistor R2; the two ends of the resistor R3 are respectively connected to the control end and the second end of the first switch tube Q1; the two ends of the resistor R4 are respectively connected to the first end and the second end of the first switch tube Q1; the anode of the diode D2 is connected between the first end of the first switch tube and the control end of the quick start module, the cathode is connected to the cathode of the rectifier diode ZD1, and the anode of the rectifier diode ZD1 is grounded.

[0031] In this embodiment, the fast start module includes a second switch tube Q2, resistors R5 to R9 and a capacitor C1;

[0032] The second end of the second switch tube Q2 is connected to the input voltage through resistors R5 and R6, the first end is connected to the VCC end of the power management chip U2, the control end is connected to the recovery execution module, and the control end is also connected to the input voltage through resistors R7 to R9; one end of the capacitor C1 is connected to the first end of the second switch tube Q2, and the other end is grounded.

[0033] In this embodiment, the utility model further includes an output module, the input end of the output module is connected to the signal end of the power management chip U2, and the output end is connected to the self-recovery module; the output module includes a third switch tube Q3, a resistor 10, a resistor R11, a resistor R12, a resistor R13, a diode D3 and a capacitor C2;

[0034] The control end of the third switch tube Q3 is connected to the signal end of the power management chip U2 through the resistor 10 and the resistor R11, the first end is grounded through the resistor R13, and the second end is connected to the self-recovery module as the output end; the two ends of the resistor R12 are respectively connected to the control end and the first end of the third switch tube Q3; the positive electrode of the diode D3 is connected to the control end of the third switch tube Q3, and the negative electrode is connected between the resistor 10 and the resistor R11; one end of the capacitor C2 is connected to the second end of the third switch tube Q3, and the other end is grounded.

[0035] In this embodiment, the switch module includes an optocoupler isolation component and a switch component connected in sequence, and the optocoupler isolation component includes a fourth switch tube Q4, an optocoupler U1, a resistor 14, a resistor 15 and a resistor R16;

[0036] The first end of the fourth switch tube Q4 is connected to pin 2 of the optocoupler U1, the second end is grounded, and the control end is connected to the power management chip U2 through resistor 15; pin 1 of the optocoupler U1 is connected to the power supply terminal 5V through resistor 14, and its pins 4 and 6 are both connected to the switch component.

[0037] In this embodiment, the switch component includes a thyristor Q5 and resistors 16 to R19; pins 2 and 1 of the thyristor are respectively connected to the two ends of the line access point SW1 and SW2 at the front end of the main power supply circuit, and its pin 2 is also connected to pin 6 of the optocoupler U1 through resistors 16 and R17, and its pin 1 is also connected to pin 4 of the optocoupler U1 through resistors 18 and R19, and its pin 3 is connected to pin 4 of the optocoupler U1.

[0038] In this embodiment, the first switch tube Q1 to the fourth switch tube Q4 are all triodes or MOS tubes.

[0039] In this embodiment, taking the first switch tube Q1 as an NPN transistor, the second switch tube Q2 as an N-channel MOS tube, the third switch tube Q3 as an N-channel MOS tube, and the fourth switch tube Q4 as an NPN transistor as an example, the working principle is as follows:

[0040] 1. Quick Start

[0041] When a high voltage level is inputted at the HV point and the second switch tube Q2 is turned on, the capacitor C1 is charged, and then C1 can be quickly fully charged to immediately supply power to the power terminal VCC of the power management chip U2, so that it can start quickly.

[0042] When the power management chip U2 is started, the current is conducted to DRAIN through the third switch tube Q3, and flows to the common-mode inductor L1, so that the common-mode inductor L1 starts to work, so the signal receiving component connected to the common-mode inductor L3 starts to operate, and the current is guided to the base of the first switch tube Q1 connected to P1 through the diode D1, so that the first switch tube Q1 is turned on, and the G pole voltage of the second switch tube Q2 is pulled down, thereby turning off the second switch tube Q2, so that the fast start-up circuit part will automatically stop consuming energy.

[0043] 2. Circuit switch

[0044] In the normal state, the power management chip U2 gives a continuous high level to SWCLK, which is turned on by the fourth switch tube Q4 to the optocoupler U1. After the optocoupler U1 is turned on, the signal is transmitted to the thyristor Q5, and the current is derived from the thyristor Q5, so the circuit can work normally.

[0045] When the circuit needs to be turned off, the power management chip U2 sends a low level at SWCLK to the base of the fourth switch tube Q4, and the collector voltage is too low, thereby causing the circuit to stop working.

[0046] The beneficial effects of the utility model are as follows:

[0047] (1) When receiving the input voltage, the second switch tube Q2 is turned on to charge the capacitor C1. Since the capacitance of the capacitor C1 is small, it is quickly charged and immediately supplies power to the power supply terminal VCC of the power management chip U2 so that it can start quickly. The structure is simple, the number of components is small, the cost is low, the operation is reliable, and the effect of instantaneous rapid startup is achieved.

[0048] (2) The output module is connected to the output end of the power management chip U2, and the signal is amplified through the switch tube, and then output to the signal receiving component, so that it drives the first switch tube Q1 in the recovery execution module to turn on, thereby lowering the gate voltage of the second switch tube Q2, and then turning off the MOS tube. Because the voltage is lower than the MOS tube, it cannot conduct, so the fast start circuit part will automatically stop consuming energy. It can improve the operating efficiency and stability of the equipment, reduce energy consumption and damage, and thus provide strong support and guarantee for modern production.

[0049] (3) An optocoupler isolation component is set to receive the switch signal to realize isolated signal transmission. The optocoupler U1 is used to convert the input signal into an optical signal for transmission, thereby avoiding signal interference and electrical shock.

[0050] At the same time, the electrical isolation of the switch control is realized. The control signal of the switching power supply can be isolated and transmitted through the optical coupler, avoiding the mutual influence between the switch control circuit and the controlled circuit, and improving the stability and reliability of the system.

[0051] (4) The thyristor installed on the front end of the power supply main circuit can control high power with low power, and has extremely fast response, opening and closing within microseconds. It operates without contact, sparks, or noise, has high efficiency, and low cost, and can effectively reduce the power consumption of the switch.

[0052] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A low power consumption power supply circuit, characterized in that: It includes a power management chip U2 and a quick start module, a self-recovery module and a switch module connected thereto; the power supply end of the power management chip U2 is connected to the quick start circuit, the drive end is connected to the self-recovery module, and the signal end is connected to the switch module; the self-recovery module is also connected to the control end of the quick start module; the switch module is connected in series to the front end of the power supply main circuit of the power input.

2. A low power consumption power supply circuit as claimed in claim 1, characterized in that: The self-recovery module includes a signal receiving component and a recovery execution module, the signal receiving component is connected to the signal end of the power management chip U2, and is connected to the fast start module through the recovery execution module; The signal receiving component includes a common-mode inductor L1, a diode D1, and a resistor R1. The positive phase coil of the common-mode inductor L1 is connected to the signal end of the power management chip U2, and the negative phase coil is connected to the positive electrode of the diode D1; the cathode of the diode D1 is connected to the recovery execution module; one end of the resistor R1 is connected to the positive electrode of the diode D1, and the other end is connected to the detection pin of the power management chip U2.

3. A low power consumption power supply circuit as claimed in claim 2, characterized in that: The recovery execution module includes a first switch tube Q1, a resistor R2, a resistor R3, a resistor R4, a diode D2 and a rectifier diode ZD1; the first end of the first switch tube is connected to the control end of the quick start module, the second end is grounded, and the control end is connected to the cathode of the diode D1 through the resistor R2; the two ends of the resistor R3 are respectively connected to the control end and the second end of the first switch tube Q1; the two ends of the resistor R4 are respectively connected to the first end and the second end of the first switch tube Q1; the anode of the diode D2 is connected between the first end of the first switch tube and the control end of the quick start module, the cathode is connected to the cathode of the rectifier diode ZD1, and the anode of the rectifier diode ZD1 is grounded.

4. A low power consumption power supply circuit as claimed in claim 3, characterized in that: The quick start module includes a second switch tube Q2, resistors R5 to R9 and a capacitor C1; The second end of the second switch tube Q2 is connected to the input voltage through resistors R5 and R6, the first end is connected to the VCC end of the power management chip U2, the control end is connected to the recovery execution module, and the control end is also connected to the input voltage through resistors R7 to R9; one end of the capacitor C1 is connected to the first end of the second switch tube Q2, and the other end is grounded.

5. A low power consumption power supply circuit as claimed in claim 4, characterized in that: It also includes an output module, the input end of the output module is connected to the signal end of the power management chip U2, and the output end is connected to the self-recovery module; the output module includes a third switch tube Q3, a resistor 10, a resistor R11, a resistor R12, a resistor R13, a diode D3 and a capacitor C2; The control end of the third switch tube Q3 is connected to the signal end of the power management chip U2 through the resistor 10 and the resistor R11, the first end is grounded through the resistor R13, and the second end is connected to the self-recovery module as an output end; the two ends of the resistor R12 are respectively connected to the control end and the first end of the third switch tube Q3; the positive electrode of the diode D3 is connected to the control end of the third switch tube Q3, and the negative electrode is connected between the resistor 10 and the resistor R11; one end of the capacitor C2 is connected to the second end of the third switch tube Q3, and the other end is grounded.

6. A low power consumption power supply circuit as claimed in claim 1, characterized in that: The switch module includes an optocoupler isolation component and a switch component connected in sequence, and the optocoupler isolation component includes a fourth switch tube Q4, an optocoupler U1, a resistor 14, a resistor 15 and a resistor R16; The first end of the fourth switch tube Q4 is connected to pin 2 of the optocoupler U1, the second end is grounded, and the control end is connected to the power management chip U2 through resistor 15; pin 1 of the optocoupler U1 is connected to the power supply terminal 5V through resistor 14, and its pins 4 and 6 are both connected to the switch component.

7. A low power consumption power supply circuit as claimed in claim 6, characterized in that: The switch component includes a thyristor Q5 and resistors 16 to R19; pins 2 and 1 of the thyristor are respectively connected to the two ends of the line access point at the front end of the main power supply circuit, and its pin 2 is also connected to pin 6 of the optocoupler U1 through resistors 16 and R17, and its pin 1 is also connected to pin 4 of the optocoupler U1 through resistors 18 and R19, and its pin 3 is connected to pin 4 of the optocoupler U1.

8. A low power consumption power supply circuit as claimed in claim 3, characterized in that: The first switch tube Q1 is a triode or a MOS tube.

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