Power supply circuit

Abstract

The utility model discloses a power supply circuit which receives a first voltage provided by an external power supply through a voltage conversion circuit, converts the first voltage into a second voltage and outputs the second voltage to an energy storage circuit. The energy storage circuit receives the second voltage, stores electric energy and outputs working voltage to a load; the sampling circuit obtains the voltage value of the working voltage output by the energy storage circuit and outputs the voltage value to the feedback end of the voltage conversion circuit; the driving adjustment circuit receives the PWM signal output by the controller, adjusts the frequency of the PWM signal and outputs the PWM signal to the feedback end of the voltage conversion circuit; and the feedback end of the voltage conversion circuit is also connected with the load, and is also used for receiving the voltage value of the working voltage and the PWM signal after frequency regulation, and outputting compensation voltage to the load. When the load power is relatively high, the voltage output by the power supply can meet the demand of the load, and the use efficiency of the power supply is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, and particularly relates to a power supply circuit. Background Art

[0002] With the development of the IVD industry, the internal structure circuit of IVD instruments is becoming more and more complex, and the requirement for the power supply ability is also getting higher and higher. The voltage output by the power supply in the prior art has ripples, and when the load power is large, the voltage output by the power supply cannot meet the requirements of the load, resulting in a reduction in the use efficiency of the power supply. Summary of the Utility Model

[0003] Based on this, it is necessary to propose a power supply circuit for the above problems.

[0004] A power supply circuit includes:

[0005] A voltage conversion circuit, configured to receive a first voltage provided by an external power supply, and convert the first voltage into a second voltage and output it to an energy storage circuit;

[0006] The energy storage circuit is configured to receive the second voltage and output a working voltage to a load;

[0007] A sampling circuit, configured to collect the working voltage output by the energy storage circuit and transmit it to the voltage conversion circuit;

[0008] A driving and adjusting circuit, configured to receive a PWM signal sent by a controller, adjust it to a fixed frequency, and then transmit it to the voltage conversion circuit. The voltage conversion circuit outputs a compensation voltage to the load according to the working voltage output by the energy storage circuit and the fixed frequency of the PWM signal.

[0009] In one embodiment, the power supply circuit further includes:

[0010] A first filtering circuit, connected between the external power supply and the voltage conversion circuit, and configured to filter the first voltage output by the external power supply and then output it to the voltage conversion circuit;

[0011] A second filtering circuit, connected between the voltage conversion circuit and the energy storage circuit, and configured to filter the second voltage output by the voltage conversion circuit and then output it to the energy storage circuit.

[0012] In one embodiment, the driving and adjusting circuit includes:

[0013] A driving circuit, with an input end connected to the controller and an output end connected to the input end of a low-pass filtering circuit, and configured to receive the PWM signal output by the controller, enhance the PWM signal, and then output it to the low-pass filtering circuit;

[0014] The low-pass filter circuit has its output terminal connected to the feedback terminal of the voltage conversion circuit, and is configured to receive the enhanced PWM signal, adjust the frequency of the enhanced PWM signal to a fixed frequency, and then output it to the voltage conversion circuit.

[0015] In one embodiment, the voltage conversion circuit includes: a voltage conversion chip and a first capacitor;

[0016] The input terminal of the voltage conversion chip is connected to the external power supply, and the output terminal of the voltage conversion chip is connected to the input terminal of the energy storage circuit;

[0017] One end of the first capacitor is connected to the switching terminal of the voltage conversion chip, and the other end of the first capacitor is connected to the output terminal of the voltage conversion chip.

[0018] In one embodiment, the energy storage circuit includes: a diode, an inductor, and a second capacitor;

[0019] The anode of the diode is connected to the ground terminal of the voltage conversion chip, and the cathode of the diode is connected to one end of the inductor;

[0020] One end of the inductor is connected to the other end of the first capacitor, and the other end of the inductor is connected to one end of the second capacitor and the load;

[0021] The other end of the second capacitor is connected to the ground terminal of the voltage conversion chip and grounded.

[0022] In one embodiment, the sampling circuit includes: a first resistor and a second resistor;

[0023] One end of the first resistor is connected to the other end of the inductor, and the other end of the first resistor is connected to one end of the second resistor and the feedback terminal of the voltage conversion chip;

[0024] The other end of the second resistor is grounded.

[0025] In one embodiment, the drive circuit includes: an operational amplifier;

[0026] The non-inverting input terminal of the operational amplifier is connected to the controller, and the output terminal of the operational amplifier is connected to the inverting input terminal of the operational amplifier and the low-pass filter circuit.

[0027] In one embodiment, the low-pass filter circuit includes: a third resistor, a fourth resistor, and a third capacitor;

[0028] One end of the fourth resistor is connected to the output end of the operational amplifier, the other end of the fourth resistor is connected to one end of the third resistor, and the other end of the third resistor is connected to the feedback end of the voltage conversion chip;

[0029] One end of the third capacitor is connected to the connection point of the fourth resistor and the third resistor, and the other end of the third capacitor is grounded.

[0030] In one embodiment, the first filtering circuit includes: a fourth capacitor, a fifth capacitor, and a sixth capacitor;

[0031] One end of the fourth capacitor is connected to the external power supply and the voltage conversion circuit, and the other end is grounded;

[0032] The fifth capacitor and the sixth capacitor are both connected in parallel with the fourth capacitor.

[0033] In one embodiment, the second filtering circuit includes: a fifth resistor and a seventh capacitor;

[0034] One end of the seventh capacitor is connected to the voltage conversion circuit, and the other end of the seventh capacitor is connected to one end of the fifth resistor;

[0035] The other end of the fifth resistor is connected to the energy storage circuit.

[0036] Implementing the embodiments of the present invention will have the following beneficial effects:

[0037] This application receives the first voltage provided by the external power supply through the voltage conversion circuit, converts the first voltage into a second voltage and outputs it to the energy storage circuit; the energy storage circuit receives the second voltage, stores electrical energy, and outputs a working voltage to the load; the sampling circuit obtains the voltage value of the working voltage output by the energy storage circuit and outputs it to the feedback end of the voltage conversion circuit; the drive adjustment circuit receives the PWM signal output by the controller, adjusts the frequency of the PWM signal and outputs it to the feedback end of the voltage conversion circuit; the feedback end of the voltage conversion circuit is also connected to the load, and is also used to receive the voltage value of the working voltage and the PWM signal with adjusted frequency, and output a compensation voltage to the load. When the load power is large, the compensation voltage output by the power supply circuit can meet the requirements of the load, improving the use efficiency of the power supply. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Wherein:

[0040] Figure 1 It is a structural block diagram of a power supply circuit in an embodiment;

[0041] Figure 2 It is a structural block diagram of a power supply circuit in another embodiment;

[0042] Figure 3 It is a circuit diagram of a power supply circuit in an embodiment. Detailed implementation manners

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0044] With the development of the IVD industry, the internal structure circuit of IVD instruments is becoming more and more complex, and the requirement for the power supply ability is also getting higher and higher. The voltage output by the power supply in the prior art has ripples, and when the load power is large, the voltage output by the power supply cannot meet the requirements of the load, resulting in a decrease in the use efficiency of the power supply.

[0045] To solve the above technical problems, the present application provides a power supply circuit, as Figure 1As shown, it includes: a voltage conversion circuit 20, an energy storage circuit 30, a sampling circuit 50, and a drive adjustment circuit 60. Among them, the input end of the voltage conversion circuit 20 is connected to an external power supply, and the output end is connected to the input end of the energy storage circuit 30, and is used to receive the first voltage provided by the external power supply, and convert the first voltage into a second voltage and then output it to the energy storage circuit 30; the output end of the energy storage circuit 30 is connected to a load, and is used to receive the second voltage, store electrical energy, and output a working voltage to the load; the input end of the sampling circuit 50 is connected to the output end of the energy storage circuit 30, and the output end is connected to the feedback end of the voltage conversion circuit 20, and is used to obtain the voltage value of the working voltage output by the energy storage circuit 30 and output it to the feedback end of the voltage conversion circuit 20; the input end of the drive adjustment circuit 60 is connected to a controller, and the output end is connected to the feedback end of the voltage conversion circuit 20, and is used to receive the PWM signal output by the controller, and adjust the change frequency of the PWM signal to a fixed frequency and then output it to the feedback end of the voltage conversion circuit 20; the feedback end of the voltage conversion circuit 20 is also connected to the load, and is also used to receive the voltage value of the working voltage and the PWM signal with a fixed frequency, and output a compensation voltage to the load. If the power of the load is large, according to the formula P = UI, the power supply circuit will preferentially meet the current demand of the load. Because the internal resistance of the power supply circuit is fixed, combined with the formula U = IR, if the current increases, the voltage also needs to increase to match the load. However, the current voltage is only the working voltage output by the energy storage circuit 30, which is not sufficient to meet the load. Therefore, a compensation voltage needs to be output for compensation. In this application, the voltage conversion circuit receives the first voltage provided by the external power supply, converts the first voltage into a second voltage and then outputs it to the energy storage circuit; the energy storage circuit receives the second voltage, stores electrical energy, and outputs a working voltage to the load; the sampling circuit obtains the voltage value of the working voltage output by the energy storage circuit and outputs it to the feedback end of the voltage conversion circuit; the drive adjustment circuit receives the PWM signal output by the controller, adjusts the frequency of the PWM signal and then outputs it to the feedback end of the voltage conversion circuit; the feedback end of the voltage conversion circuit is also connected to the load, and is also used to receive the voltage value of the working voltage and the PWM signal with an adjusted frequency, and output a compensation voltage to the load. When the load power is large, the voltage output by the power supply can meet the requirements of the load, improving the use efficiency of the power supply.

[0046] In one embodiment, as Figure 2As shown, the power supply circuit further includes: a first filter circuit 10 and a second filter circuit 40. Among them, the first filter circuit 10 is connected between the external power supply and the voltage conversion circuit 20, and is used to filter the first voltage output by the external power supply and then output it to the voltage conversion circuit 20; the second filter circuit 40 is connected between the voltage conversion circuit 20 and the energy storage circuit 30, and is used to filter the second voltage output by the voltage conversion circuit 20 and then output it to the energy storage circuit 30.

[0047] In one embodiment, as Figure 3 shown, the drive adjustment circuit 60 includes: a drive circuit 601 and a low-pass filter circuit 602. Among them, the input end of the drive circuit 601 is connected to the controller, and the output end is connected to the input end of the low-pass filter circuit 602, and is used to receive the PWM signal output by the controller, and enhance the PWM signal and then output it to the low-pass filter circuit 602; the output end of the low-pass filter circuit 602 is connected to the feedback end of the voltage conversion circuit 20, and is used to receive the enhanced PWM signal, and adjust the frequency of the enhanced PWM signal to a fixed frequency and then output it to the voltage conversion circuit 20.

[0048] In one embodiment, as Figure 3 shown, the voltage conversion circuit 20 includes: a voltage conversion chip U1 and a first capacitor C1; among them, the input end VIN of the voltage conversion chip U1 is connected to the external power supply, and the output end PH of the voltage conversion chip U1 is connected to the input end of the energy storage circuit 30; one end of the first capacitor C1 is connected to the switch end BOOT of the voltage conversion chip U1, and the other end of the first capacitor C1 is connected to the output end PH of the voltage conversion chip U1.

[0049] In one embodiment, as Figure 3 shown, the energy storage circuit 30 includes: a diode D1, an inductor L1 and a second capacitor C5; among them, the anode of the diode D1 is connected to the ground terminal GND1 of the voltage conversion chip U1, and the cathode of the diode D1 is connected to one end of the inductor L1; one end of the inductor L1 is connected to the other end of the first capacitor C1, the other end of the inductor L1 is connected to one end of the second capacitor C5 and the load; the other end of the second capacitor C5 is connected to the ground terminal GND1 of the voltage conversion chip U1 and grounded.

[0050] In one embodiment, as Figure 3As shown, the sampling circuit 50 includes: a first resistor R2 and a second resistor R10; wherein, one end of the first resistor R2 is connected to the other end of the inductor L1, and the other end of the first resistor R2 is connected to one end of the second resistor R10 and the feedback terminal FB of the voltage conversion chip U1; the other end of the second resistor R10 is grounded.

[0051] In one embodiment, as Figure 3 shown, the drive circuit 601 includes: an operational amplifier U2A; wherein, the non-inverting input terminal of the operational amplifier U2A is connected to the controller, and the output terminal of the operational amplifier U2A is connected to the inverting input terminal of the operational amplifier U2A and the low-pass filter circuit 602.

[0052] In one embodiment, as Figure 3 shown, the low-pass filter circuit 602 includes: a third resistor R8, a fourth resistor R9, and a third capacitor C13; wherein, one end of the fourth resistor R9 is connected to the output terminal of the operational amplifier U2A, the other end of the fourth resistor R9 is connected to one end of the third resistor R8, and the other end of the third resistor R8 is connected to the feedback terminal FB of the voltage conversion chip U1; one end of the third capacitor C13 is connected to the connection point of the fourth resistor R9 and the third resistor R8, and the other end of the third capacitor C13 is grounded.

[0053] In one embodiment, as Figure 3 shown, the first filter circuit 10 includes: a fourth capacitor C4, a fifth capacitor C2, and a sixth capacitor C3; wherein, one end of the fourth capacitor C4 is connected to the external power supply and the voltage conversion circuit 20, and the other end is grounded; the fifth capacitor C2 and the sixth capacitor C3 are both connected in parallel with the fourth capacitor C4.

[0054] In one embodiment, as Figure 3 shown, the second filter circuit 40 includes: a fifth resistor R1 and a seventh capacitor C8; wherein, one end of the seventh capacitor C8 is connected to the voltage conversion circuit 20, and the other end of the seventh capacitor C8 is connected to one end of the fifth resistor R1; the other end of the fifth resistor R1 is connected to the energy storage circuit 30.

[0055] The foregoing disclosures are only the preferred embodiments of the present invention, and of course, the scope of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A power supply circuit, characterized in that: include: A voltage conversion circuit, used for receiving a first voltage provided by an external power source, converting the first voltage into a second voltage and outputting the second voltage to the energy storage circuit; The energy storage circuit is used to receive the second voltage and output a working voltage to a load; A sampling circuit, used for collecting the working voltage output by the energy storage circuit and transmitting it to the voltage conversion circuit; The drive adjustment circuit is used to receive the PWM signal sent by the controller and adjust it to a fixed frequency before transmitting it to the voltage conversion circuit. The voltage conversion circuit outputs a compensation voltage to the load according to the working voltage output by the energy storage circuit and the fixed frequency of the PWM signal.

2. The power supply circuit according to claim 1, characterized in that: Also includes: A first filter circuit is connected between the external power supply and the voltage conversion circuit, and is used for filtering the first voltage output by the external power supply and outputting it to the voltage conversion circuit; The second filtering circuit is connected between the voltage conversion circuit and the energy storage circuit, and is used for filtering the second voltage output by the voltage conversion circuit and then outputting it to the energy storage circuit.

3. The power supply circuit according to claim 1, characterized in that: The drive adjustment circuit comprises: A driving circuit, the input end of which is connected to the controller, and the output end of which is connected to the input end of the low-pass filter circuit, for receiving the PWM signal output by the controller, and enhancing the PWM signal before outputting it to the low-pass filter circuit; The output end of the low-pass filter circuit is connected to the feedback end of the voltage conversion circuit, and is used to receive the enhanced PWM signal, and adjust the frequency of the enhanced PWM signal to a fixed frequency before outputting it to the voltage conversion circuit.

4. The power supply circuit according to claim 3, characterized in that: The voltage conversion circuit comprises: a voltage conversion chip and a first capacitor; The input end of the voltage conversion chip is connected to the external power supply, and the output end of the voltage conversion chip is connected to the input end of the energy storage circuit; One end of the first capacitor is connected to the switch end of the voltage conversion chip, and the other end of the first capacitor is connected to the output end of the voltage conversion chip.

5. The power supply circuit according to claim 4, characterized in that: The energy storage circuit comprises: a diode, an inductor and a second capacitor; The anode of the diode is connected to the ground terminal of the voltage conversion chip, and the cathode of the diode is connected to one end of the inductor; One end of the inductor is connected to the other end of the first capacitor, and the other end of the inductor is connected to one end of the second capacitor and the load; The other end of the second capacitor is connected to the ground end of the voltage conversion chip and is grounded.

6. The power supply circuit according to claim 5, characterized in that: The sampling circuit comprises: a first resistor and a second resistor; One end of the first resistor is connected to the other end of the inductor, and the other end of the first resistor is connected to one end of the second resistor and a feedback end of the voltage conversion chip; The other end of the second resistor is grounded.

7. The power supply circuit according to claim 6, characterized in that: The driving circuit comprises: an operational amplifier; The non-inverting input terminal of the operational amplifier is connected to the controller, and the output terminal of the operational amplifier is connected to the inverting input terminal of the operational amplifier and the low-pass filter circuit.

8. The power supply circuit according to claim 7, characterized in that: The low-pass filter circuit comprises: a third resistor, a fourth resistor and a third capacitor; One end of the fourth resistor is connected to the output end of the operational amplifier, the other end of the fourth resistor is connected to one end of the third resistor, and the other end of the third resistor is connected to the feedback end of the voltage conversion chip; One end of the third capacitor is connected to a connection point between the fourth resistor and the third resistor, and the other end of the third capacitor is grounded.

9. The power supply circuit according to claim 2, characterized in that: The first filtering circuit includes: a fourth capacitor, a fifth capacitor and a sixth capacitor; One end of the fourth capacitor is connected to the external power supply and the voltage conversion circuit, and the other end is grounded; The fifth capacitor and the sixth capacitor are both connected in parallel with the fourth capacitor.

10. The power supply circuit according to claim 2, characterized in that: The second filtering circuit comprises: a fifth resistor and a seventh capacitor; One end of the seventh capacitor is connected to the voltage conversion circuit, and the other end of the seventh capacitor is connected to one end of the fifth resistor; The other end of the fifth resistor is connected to the energy storage circuit.

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