CN219322275U

CN219322275U - Power supply circuit, auxiliary power supply and electronic equipment

Info

Publication number: CN219322275U
Application number: CN202223422376.0U
Authority: CN
Inventors: 骆锋; 童文平; 陈玉光; 陈熙; 王雷
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-07-07
Anticipated expiration: 2032-12-19

Abstract

The application relates to a power supply circuit, an auxiliary power supply and electronic equipment. The power supply circuit is applied to the auxiliary power supply and is used for providing a target voltage for the auxiliary power supply so that the auxiliary power supply generates and outputs an output voltage based on the target voltage. The power supply circuit includes: the device comprises a starting unit, a conversion unit, a control unit and a protection unit. The control unit outputs a first electric signal after being electrified and started due to the power supply of the starting unit, the output end of the auxiliary power supply can generate output voltage and supply power for the control unit, and meanwhile, the protection unit can output a second electric signal to the starting unit under the control of the first electric signal to enable the starting unit to be turned off so as to control the starting unit to stop outputting the starting voltage, so that the control unit enters a power-off protection state, the starting unit is always kept in a working state due to the short circuit of the output of the auxiliary power supply, and the problem that the elements in the starting unit are burnt out due to overlong working time of the elements is avoided.

Description

Power supply circuit, auxiliary power supply and electronic equipment

Technical Field

The application belongs to the technical field of power supplies, and particularly relates to a power supply circuit, an auxiliary power supply and electronic equipment.

Background

In the related art, when the power supply is started, the auxiliary power supply is generally needed to provide working voltage for the corresponding control module through the starting circuit, so that the main control module is started, the corresponding voltage transformation module or the corresponding output module is controlled to generate output voltage based on the input voltage after the main control module is started, and finally the starting circuit is turned off by utilizing the output voltage after detecting the output voltage, and the output voltage is used for supplying power to the control module, so that the starting of the power supply is completed.

However, if a short circuit fault occurs at the output end of the voltage transformation module or the output module, the output voltage is reduced to zero, so that the starting circuit keeps outputting to drive the control module to work all the time, and the starting circuit is easy to burn out due to too long working time.

Disclosure of Invention

The application aims to provide a power supply circuit, an auxiliary power supply and electronic equipment, and aims to solve the problem that elements in a starting circuit are easy to continuously work and damage under the condition that an output end is short-circuited in a traditional power supply.

A first aspect of an embodiment of the present application provides a power supply circuit, which is applied to an auxiliary power supply, and is configured to provide a target voltage to the auxiliary power supply so that the auxiliary power supply generates and outputs an output voltage based on the target voltage; the power supply circuit includes: the device comprises a starting unit, a conversion unit, a control unit and a protection unit; the starting unit is used for being connected with a power supply, and is used for generating starting voltage based on the power supply voltage of the power supply; the conversion unit is used for being connected with the power supply and the control unit; the conversion unit is used for converting the power supply voltage into the target voltage under the control of the control unit and then supplying power to the auxiliary power supply; the power end of the control unit is respectively connected with the output end of the auxiliary power supply and the output end of the starting unit, and the control unit is used for powering on and starting when receiving the output voltage or the starting voltage; the first output end of the control unit is connected with the conversion unit so as to control the conversion unit; the second output end of the control unit is connected with the controlled end of the protection unit, and the control unit is further used for outputting a first electric signal at the second output end when the control unit is electrified and started; the first conducting end of the protection unit is connected with the starting unit; the second conducting end of the protection unit is grounded; the protection unit is used for outputting a second electric signal when receiving the first electric signal; the second electric signal is used for controlling the starting unit to stop outputting the starting voltage.

In one embodiment, the device further comprises a delay unit; the first end of the delay unit is connected with the controlled end of the protection unit, and the second end of the delay unit is grounded; the delay unit is used for delaying the time when the first electric signal reaches the protection unit or delaying the time when the first electric signal is removed from the control end of the protection unit.

In one embodiment, the delay unit includes a delay resistor and a delay capacitor, a first end of the delay capacitor is connected to the controlled end of the protection unit, a second end of the delay capacitor is grounded, and the delay resistor is connected in parallel with the delay capacitor.

In one embodiment, the device further comprises a first holding unit; the first end of the first holding unit is used for being connected with the first conducting end of the auxiliary power supply so as to receive the output voltage; the second end of the first holding unit is connected with the controlled end of the protection unit, and the controlled end of the first holding unit is connected with the output end of the protection unit; the first holding unit is used for controlling the protection unit to keep outputting the second electric signal in a first duration when the protection unit outputs the second electric signal.

In one embodiment, the first holding unit includes a first switching tube, a first energy storage capacitor, a first blocking capacitor, a first voltage dividing resistor, a second voltage dividing resistor and a first unidirectional conductive device; the first end of the first blocking capacitor is connected with the first conducting end of the protection unit, the second end of the first blocking capacitor is connected with the first end of the first voltage dividing resistor, the second end of the first voltage dividing resistor is connected with the controlled end of the first switch tube, the first conducting end of the first switch tube is respectively connected with the output end of the auxiliary power supply, the second conducting end of the first switch tube is connected with the controlled end of the protection unit, the first end of the first energy storage capacitor is connected with the controlled end of the first switch tube, the second end of the first energy storage capacitor is connected with the first conducting end of the first switch tube, the second voltage dividing resistor is connected with the first energy storage capacitor in parallel, the positive electrode of the first unidirectional conductor is connected with the controlled end of the first switch tube, and the negative electrode of the first unidirectional conductor is connected with the first conducting end of the first switch tube.

In one embodiment, the protection device further comprises a second holding unit, wherein the controlled end of the second holding unit is connected with the first conducting end of the protection unit; the first end of the second holding unit is connected with the controlled end of the protection unit, and the second end of the second holding unit is grounded; the second holding unit is used for controlling the protection unit to stop outputting the second electric signal after delaying a second time period when the protection unit stops outputting the second electric signal.

In one embodiment, the second holding unit includes a second switching tube, a second energy storage capacitor, a second blocking capacitor, a third voltage dividing resistor, a fourth voltage dividing resistor and a second unidirectional conductive device; the first end of the second blocking capacitor is connected with the first conducting end of the protection unit, the second end of the second blocking capacitor is connected with the first end of the third voltage dividing resistor, the second end of the third voltage dividing resistor is connected with the controlled end of the second switching tube, the first conducting end of the second switching tube is connected with the controlled end of the protection unit, the second conducting end of the second switching tube is grounded, the first end of the second energy storage capacitor is connected with the controlled end of the second switching tube, the second end of the second energy storage capacitor is connected with the second conducting end of the second switching tube, the fourth voltage dividing resistor is connected in parallel with the second energy storage capacitor, the positive electrode of the second unidirectional conductor is connected with the second conducting end of the second switching tube, and the negative electrode of the second unidirectional conductor is connected with the controlled end of the second switching tube.

In one embodiment, the starting unit includes a first voltage dividing unit, a second voltage dividing unit and a third switching tube; the protection unit comprises a fourth switching tube; the first end of the first voltage division unit is used for being connected with the power supply, the second end of the first voltage division unit is connected with the controlled end of the third switching tube and the first conducting end of the fourth switching tube, the first end of the second voltage division unit is used for being connected with the power supply, the second end of the second voltage division unit is connected with the first conducting end of the third switching tube, and the second conducting end of the third switching tube is connected with the power supply end of the control unit; the controlled end of the fourth switching tube is connected with the second output end of the control unit, the second conducting end of the fourth switching tube is grounded, and the fourth switching tube is configured to be conducted when the first electric signal is received so as to output the second electric signal with a low level at the first conducting end; the second electric signal is used for controlling the third switching tube to be turned off.

A second aspect of the embodiments of the present application provides an auxiliary power supply, including a power supply circuit, a transformation circuit, and an output circuit; the power supply circuit is the power supply circuit; the conversion unit of the power supply circuit is coupled to the primary side of the transformation circuit, and the output circuits are both coupled to the secondary side of the transformation circuit.

A third aspect of embodiments of the present application provides an electronic device, including an auxiliary power supply as described above.

The beneficial effects of the embodiment of the application are that: the application provides a power supply circuit, which is applied to an auxiliary power supply and is used for providing a target voltage for the auxiliary power supply so that the auxiliary power supply generates and outputs an output voltage based on the target voltage. The power supply circuit comprises a starting unit, a conversion unit, a control unit and a protection unit. The starting unit is used for being connected with the power supply and generating starting voltage based on the power supply voltage of the power supply, the power end of the control unit is respectively connected with the output end of the auxiliary power supply and the output end of the starting unit, and the output voltage output by the auxiliary power supply and the starting voltage output by the starting unit can be used for supplying power to the control unit so as to enable the control unit to be electrified and started. The first conducting end of the protection unit is connected with the starting unit, the controlled end of the protection unit is connected with the second output end of the control unit and is used for receiving the first electric signal output by the second output end of the control unit, and the protection unit is used for outputting the second electric signal when receiving the first electric signal so as to control the starting unit to stop outputting the starting voltage. By means of the scheme, when the auxiliary power supply output short circuit occurs, the output voltage of the output end of the auxiliary power supply becomes zero, the protection unit can be controlled by the first electric signal output by the second output end of the control unit, so that the protection unit outputs the second electric signal when receiving the first electric signal, the starting unit is controlled to stop outputting the starting voltage, the control unit is enabled to enter a power-off protection state, and the problem that the starting unit is always kept in a working state due to the auxiliary power supply output short circuit, and the resulting elements in the starting unit are excessively long in working time and burnt is avoided.

Drawings

FIG. 1 is a schematic diagram of an auxiliary power supply according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an auxiliary power supply according to another embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a power supply circuit according to an embodiment of the present disclosure;

FIG. 4 is a circuit diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of a power supply circuit according to another embodiment of the present disclosure;

FIG. 6 is a circuit diagram of a first holding unit according to an embodiment of the present application;

fig. 7 is a circuit diagram of a second holding unit according to an embodiment of the present application;

fig. 8 is a schematic diagram of an electronic device according to an embodiment of the present application.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Fig. 1 is a schematic diagram of an auxiliary power supply according to an embodiment of the present application, and for convenience of explanation, only the portions related to the embodiment are shown, which are described in detail below:

an auxiliary power supply 20 includes a power supply circuit 10, a transformation circuit 30, and an output circuit 40. The power supply circuit 10 is coupled to the primary side of the transformer circuit 30, and the output circuit 40 is coupled to the secondary or primary side of the transformer circuit 30.

The transformer circuit 30 includes a transformer T1, the power supply circuit 10 is coupled to a primary side of the transformer circuit 30 through a first primary winding of the transformer T1, and the output circuit 40 is coupled to a secondary side of the transformer T1 through a secondary winding of the transformer T1 or is coupled to the primary side of the transformer T1 through the primary winding of the transformer T1. After the power supply circuit 10 supplies power to the first primary winding of the transformer T1, the transformer T1 transforms the voltage to generate an induced voltage on the coil winding connected to the output circuit 40, so that the output circuit 40 performs voltage stabilization conversion to obtain a required output voltage for output, thereby realizing the electric energy output of the output circuit 40.

In an embodiment, the auxiliary power supply 20 includes a plurality of output circuits 40 respectively coupled to the primary side or the secondary side of the transformer circuit 30 through the secondary winding of the corresponding transformer T1, and the plurality of output circuits 40 can respectively output voltages with different magnitudes. In one example, auxiliary power supply 20 may include two output circuits 40 to generate output voltage VOUT1 and output voltage VOUT2, respectively, and parameters of the two output voltages may be different, wherein output voltage VOUT1 may be provided to power supply circuit 10 to drive operation of some of the components in power supply circuit 10.

In one embodiment, as shown in FIG. 2, the auxiliary power supply 20 also includes two different types of power supply circuits. Specifically, the power supply circuit may include an ac power supply circuit 50 and a dc power supply circuit 60, where the ac power supply circuit 50 is connected to an ac power supply, and coupled to a primary side of the transformer circuit 30 through a second primary winding of the transformer T1, and the ac power supply circuit 50 performs voltage transformation through the transformer T1 after supplying power to the first primary winding of the transformer T1, so as to output electric energy of the output circuit 40. The dc power supply circuit 60 is coupled to the secondary side of the transformer T1, and the dc power supply circuit 60 is configured to supply power to the auxiliary power source 20 when a dc power source is connected to the secondary side, so as to generate a corresponding voltage on the primary side winding, and further generate an induced voltage on other windings of the transformer T1.

It can be understood that the power supply circuit 10 of the present application may be the AC power supply circuit 50 and the DC power supply circuit 60, and when the power supply circuit 10 is the AC power supply circuit 50, an AC/DC conversion unit is added between the power supply circuit 10 and the AC power supply to convert the AC power into the DC power.

Fig. 3 is a schematic diagram of a power supply circuit according to an embodiment of the present application, and for convenience of explanation, only a portion related to the embodiment is shown, which is described in detail below:

a power supply circuit 10 that can be applied to the auxiliary power supply 20 of any of the above embodiments, the power supply circuit 10 being configured to supply a target voltage to the auxiliary power supply 20 so that the auxiliary power supply 20 generates and outputs an output voltage VOUT1 based on the target voltage, particularly, see fig. 1 and 2.

Referring to fig. 3, the power supply circuit 10 includes: a start-up unit 100, a conversion unit 200, a control unit 300, and a protection unit 400. The starting unit 100 is connected to the power supply 70, and the starting unit 100 is configured to generate a starting voltage based on a supply voltage VIN of the power supply 70. The conversion unit 200 is connected to the power supply 70 and to the control unit 300, and the conversion unit 200 is configured to convert the power supply voltage VIN into a target voltage under the control of the control unit 300, where the target voltage is formed on a transformer T1 (see fig. 1) to supply power to the auxiliary power supply 20. The power supply terminal VCC of the control unit 300 is connected to the output terminal of the auxiliary power supply 20 and the output terminal of the starting unit 100, respectively, and the control unit 300 is configured to be powered on and started when receiving the output voltage VOUT1 or the starting voltage. The first output terminal OUT of the control unit 300 is connected to the conversion unit 200 to control the conversion unit 200. The second output terminal VREF of the control unit 300 is connected to the controlled terminal of the protection unit 400, and the control unit 300 is further configured to output a first electrical signal at the second output terminal VREF when the power is turned on. The first conductive terminal of the protection unit 400 is connected to the start-up unit 100, and the second conductive terminal of the protection unit 400 is grounded. The protection unit 400 is configured to output a second electrical signal when receiving the first electrical signal, and the second electrical signal is configured to control the start-up unit 100 to stop outputting the start-up voltage.

The control unit 300 may be a single chip or a microprocessor, in an example, the control unit 300 is a main control chip U1, the output voltage VOUT1 may be 12V, and the starting voltage may be a supply voltage VIN output by the power supply 70 or a voltage obtained by boosting or reducing the supply voltage VIN or an ac-dc converted voltage.

The power supply 70 of the present application may be a solar panel or a battery. The power supply 70 may further include a corresponding dc voltage transformation circuit to generate the stable power supply voltage VIN through voltage transformation by the dc voltage transformation circuit.

After the control unit 300 is powered on and started by the power supply of the starting unit 100, the output terminal of the auxiliary power supply 20 will generate the output voltage VOUT1 and supply power to the control unit 300, so as to complete the starting of the auxiliary power supply 20. That is, the power supply terminal VCC of the control unit 300 receives the output voltage VOUT1 of the output terminal of the auxiliary power supply 20 and the start voltage outputted by the start unit 100, and is powered by the start voltage when the start voltage is higher than the output voltage VOUT1, and is powered by the output voltage VOUT1 when the output voltage VOUT1 is higher than the start voltage.

In the related art, the start-up unit 100 is controlled by the output voltage VOUT1, and when the output voltage VOUT1 is greater than the threshold value, the start-up unit 100 is turned off after receiving the output voltage VOUT1, so that the control unit 300 operates under the power supply of the output voltage VOUT 1. When the output terminal of the auxiliary power supply 20 is shorted, the output voltage VOUT1 is zero, and the starting unit 100 will always maintain the on state, so that the control unit 300 is always in the power-on state, and the starting unit 100 is also always in the working state, so that the starting unit 100 is caused to work for too long to fail.

When the auxiliary power supply 20 outputs a short circuit, the protection unit 400 can be controlled by the first electric signal output by the second output end VREF of the control unit 300, so that the protection unit 400 outputs the second electric signal when receiving the first electric signal, and the starting unit 100 is controlled to stop outputting the starting voltage, so that the control unit 300 enters a power-off protection state, and the problem that the starting unit 100 is continuously in a working state due to the short circuit of the output end of the auxiliary power supply 20, and the resulting elements in the starting unit 100 are burnt out due to overlong working time is avoided.

In an embodiment, the control unit 300 may output the first electrical signal when the output voltage VOUT1 supplies power to the power supply terminal VCC, or may output the first electrical signal when the output terminal of the auxiliary power supply 20 is detected to be short-circuited.

In an embodiment, as shown in fig. 4, the starting unit 100 includes a first voltage dividing unit 110, a second voltage dividing unit 120, and a third switching tube Q3. The protection unit 400 includes a fourth switching tube Q4.

The first end of the first voltage dividing unit 110 is connected to the power supply 70, the second end of the first voltage dividing unit 110 is connected to the controlled end of the third switching tube Q3 and the first conducting end of the fourth switching tube Q4, the first end of the second voltage dividing unit 120 is connected to the power supply 70, the second end of the second voltage dividing unit 120 is connected to the first conducting end of the third switching tube Q3, and the second conducting end of the third switching tube Q3 is connected to the power supply end VCC of the control unit 300. The first voltage dividing unit 110 is configured to divide the supply voltage VIN to provide a suitable voltage/current component to the controlled end of the third switching tube Q3, so that the third switching tube Q3 is protected from surge impact. The second voltage dividing unit 120 is configured to divide the power supply voltage VIN and transmit the divided power supply voltage VIN to the power supply terminal VCC of the control unit 300, so as to avoid the control unit 300 from being impacted by excessive voltage.

The first voltage dividing unit 110 and the second voltage dividing unit 120 may each be a voltage dividing circuit composed of a plurality of resistors connected in series and parallel. In an example, as shown in fig. 4, the first voltage dividing unit 110 may be composed of a resistor R8 and a resistor R9, and the second voltage dividing unit 120 may be composed of a resistor R10, a resistor R11, a resistor R12, and a resistor R13. The resistor R9 is connected in series between the power supply 70 and the controlled end of the third switching tube Q3, and the resistor R9 is connected in parallel with the resistor R8. The resistor R10 and the resistor R11 are sequentially connected in series between the first conducting end of the third switching tube Q3 and the power supply 70, the resistor R12 is connected in parallel with the resistor R10, and the resistor R13 is connected in parallel with the resistor R11. The specific resistance of the voltage dividing circuit can be accurately controlled through the serial-parallel connection of the plurality of resistors, and meanwhile, the plurality of resistors are used for replacing the first voltage dividing unit 110 and the second voltage dividing unit 120 to split current or voltage, so that the overlarge voltage on a single resistor or overlarge current flowing through the single resistor is avoided, and the stability of the circuit is improved.

In one embodiment of the present application, a fifth voltage dividing resistor R5 is further connected between the controlled end and the second conducting end of the third switching tube Q3, where the fifth voltage dividing resistor R5 is used to stabilize the third switching tube Q3, so as to avoid erroneous conduction of the third switching tube Q3. The controlled end of the third switching tube Q3 is also connected with a first zener diode Z1, the cathode of the first zener diode Z1 is connected with the controlled end of the third switching tube Q3, the anode of the first zener diode Z1 is grounded, and the first zener diode Z1 is used for limiting the voltage of the controlled end of the third switching tube Q3 so as to avoid overhigh voltage of the controlled end of the third switching tube Q3. The second conducting end of the third switching tube Q3 is further connected with a third unidirectional conducting device D3, the third unidirectional conducting device D3 is connected between the second conducting end of the third switching tube Q3 and the power end VCC of the control unit 300, the anode of the third unidirectional conducting device D3 is connected with the second conducting end of the third switching tube Q3, and the cathode of the third unidirectional conducting device D3 is connected with the power end VCC of the control unit 300. A fourth unidirectional contactor D4 is connected between the output terminal of the auxiliary power supply 20 and the power terminal VCC of the control unit 300, an anode of the fourth unidirectional contactor D4 is connected with the output terminal of the auxiliary power supply 20, and a cathode of the fourth unidirectional contactor D4 is connected with the power terminal VCC of the control unit 300. The third unidirectional current collector D3 and the fourth unidirectional current collector D4 are used for performing current limiting processing on the output voltage VOUT1 and the supply voltage VIN. And selects the larger of the output voltage VOUT1 and the supply voltage VIN to be input into the power supply terminal VCC of the control unit 300.

The starting unit 100 of the present application further includes a filtering unit 130, where a first end of the filtering unit 130 is connected to the power supply terminal VCC of the control unit 300, and a second end of the filtering unit 130 is grounded. The filtering unit 130 is used for stabilizing the voltage of the power supply terminal VCC of the control unit 300. The first zener diode Z1 may be a transient zener diode, and the third unidirectional conductive device D3 and the fourth unidirectional conductive device D4 may be diodes. The filter unit 130 may include a plurality of capacitors, and in an example, as shown in fig. 4, the filter unit 130 includes a capacitor C1 and a capacitor C2 connected in parallel to ground.

As shown in fig. 4, the controlled terminal of the fourth switching tube Q4 is connected to the second output terminal VREF, and the second conductive terminal of the fourth switching tube Q4 is grounded, and the fourth switching tube Q4 is configured to be turned on to output the second electric signal of the low level at the first conductive terminal when receiving the first electric signal. The second electric signal is used for controlling the third switching tube Q3 to be turned off.

It should be noted that, the third switching tube Q3 and the fourth switching tube Q4 may be N-type MOS tubes, the first conducting end corresponds to the drain electrode of the N-type MOS tube, the second conducting end corresponds to the source electrode of the N-type MOS tube, and the controlled end corresponds to the gate electrode of the N-type MOS tube.

When the fourth switching tube Q4 is turned off, the controlled end of the third switching tube Q3 is at a high level, and the third switching tube Q3 is kept turned on to provide the start voltage to the control unit 300. After the control unit 300 is powered on and started, the first electrical signal output by the second output end VREF turns on the fourth switching tube Q4, so that the first conducting end of the fourth switching tube Q4 outputs a low-level second electrical signal, the third switching tube Q3 is turned off, the starting unit 100 is controlled to stop outputting the starting voltage, and the situation that when the output end of the auxiliary power supply 20 has a short circuit fault and the output voltage VOUT1 is 0, the starting unit 100 works for a long time and the starting unit 100 is damaged is avoided.

In an embodiment, as shown in fig. 4, the protection unit 400 further includes a fifth unidirectional current-conducting device D5 and a current-limiting resistor R14, and the fifth unidirectional current-conducting device D5 may be a diode. The fifth unidirectional current-limiting resistor R14 and the fifth unidirectional current-limiting resistor D5 are sequentially connected in series between the second output end VREF and the controlled end of the fourth switching tube Q4. The anode of the fifth unidirectional current-conducting device D5 is connected with the second output end VREF, the cathode of the fifth unidirectional current-conducting device D5 is connected with the first end of the current-limiting resistor R14, and the second end of the current-limiting resistor R14 is connected with the controlled end of the fourth switching tube Q4. The fifth unidirectional current-limiting resistor R14 and the fifth unidirectional current-limiting resistor D5 are used for preventing the voltage of the controlled end of the fourth switching tube Q4 from affecting the control unit 300, so as to protect the control unit 300.

In an embodiment, as shown in fig. 4, the power supply circuit 10 further includes a delay unit 500. The first end of the delay unit 500 is connected to the controlled end of the protection unit 400, the second end of the delay unit 500 is grounded, and the delay unit 500 is used for delaying the electrical signal transmitted to the controlled end of the protection unit 400. For example, the delay unit 500 may delay the time when the first electrical signal reaches the protection unit 400 or delay the time when the first electrical signal is removed from the control terminal of the protection unit 400.

In one embodiment, as shown in fig. 4, the delay unit 500 includes a delay resistor R15 and a delay capacitor C3, a first end of the delay capacitor C3 is connected to the controlled end of the protection unit 400, a second end of the delay capacitor C3 is grounded, and the delay resistor R15 is connected in parallel to the delay capacitor C3. When the second output terminal VREF of the control unit 300 outputs the first electrical signal, the first electrical signal charges the delay capacitor C3, so that the voltage of the first terminal of the delay capacitor C3 gradually increases, and when the voltage of the first terminal of the delay capacitor C3 increases to a preset value, the fourth switching tube Q4 in the protection unit 400 can be controlled to be turned on by the voltage of the first terminal of the delay capacitor C3. When the control unit 300 stops outputting the first electrical signal, the electrical energy on the delay capacitor C3 is released through the delay resistor R15, so that the voltage at the first end of the delay capacitor C3 gradually decreases. By controlling the voltage at the controlled terminal of the protection unit 400 through the delay unit 500, it is possible to avoid the voltage at the first output terminal of the protection unit 400 from being affected by the transient voltage fluctuation at the second output terminal VREF.

In an embodiment, as shown in fig. 4, the delay unit 500 further includes a second zener diode Z2, wherein a cathode of the second zener diode Z2 is connected to the controlled terminal of the protection unit 400, and an anode of the second zener diode Z2 is grounded to limit the voltage of the controlled terminal of the protection unit 400, so as to avoid the voltage of the controlled terminal of the protection unit 400 from being too high.

In one embodiment, as shown in fig. 4, the transformation circuit 30 includes a transformer T1. The conversion unit 200 includes a conversion switch Q5, a sixth voltage dividing resistor R6, a seventh voltage dividing resistor R7, and a sixth unidirectional conductor D6. A first terminal of the sixth voltage dividing resistor R6 is connected to the first output terminal OUT of the control unit 300, and a second terminal of the sixth voltage dividing resistor R6 is connected to the controlled terminal of the change-over switch Q5. The anode of the sixth unidirectional current transformer D6 is connected to the power supply 70 to be connected to the power supply voltage VIN, and the cathode of the sixth unidirectional current transformer D6 is connected to the first end of the first primary winding of the transformer T1. The second end of the first primary winding is connected to the first conducting end of the change-over switch Q5. The first end of the seventh voltage dividing resistor R7 is connected with the second conducting end of the change-over switch Q5, and the second end of the seventh voltage dividing resistor R7 is grounded. The change-over switch Q5 may be an N-type MOS transistor, the first conducting end of the change-over switch Q5 corresponds to the drain electrode of the N-type MOS transistor, the second conducting end of the change-over switch Q5 corresponds to the source electrode of the N-type MOS transistor, and the controlled end of the change-over switch Q5 corresponds to the gate electrode of the N-type MOS transistor.

The control unit 300 may output a modulation signal to the transfer switch Q5, and control the target voltage applied to the first primary winding by controlling the duty ratio of the modulation signal, the larger the duty ratio, the larger the target voltage.

In one embodiment, the conversion unit 200 includes an anti-reflection sub-unit 210, a filtering sub-unit 220, and a bleeding sub-unit 230. Wherein the anti-reflection subunit 210 is connected between the anode of the sixth unidirectional current collector D6 and the dc power source. The direct current voltage V1, the direct current voltage V2 and the direct current voltage V3 may be at least one, and the direct current voltage V1, the direct current voltage V2 and the direct current voltage V3 may be direct current voltages provided by photovoltaic devices, direct current generators or battery modules. The filtering subunit 220 is further connected to the anode of the sixth unidirectional current collector D6, for filtering the electric energy input to the conversion unit 200. A bleed subunit 230 is connected between the first end and the second end of the first primary winding for absorbing the bleed energy of the first primary winding when the change-over switch Q5 is turned off. Specifically, when the change-over switch Q5 is turned off, since there may be energy, such as current, in the change-over switch Q5 and the first primary winding that cannot be discharged, the energy may be discharged through the discharging subunit 230.

For example, when the dc power supply inputs power to the anti-reflection subunit 210 in the conversion unit 200 and the input power needs to be greater than the preset voltage threshold, the input power can be input to the first primary winding through the anti-reflection subunit 210, so as to ensure that the dc power supply does not overdischarge.

The anti-reflection subunit 210 includes a seventh unidirectional conductive apparatus D7, an eighth unidirectional conductive apparatus D8, a ninth unidirectional conductive apparatus D9, a tenth unidirectional conductive apparatus D10, and a thermistor RT. The seventh unidirectional guider D7, the eighth unidirectional guider D8, the ninth unidirectional guider D9, and the tenth unidirectional guider D10 may be diodes.

The anode of the seventh unidirectional current collector D7 is connected with a direct current power supply to be connected with a direct current voltage V1, and the cathode of the seventh unidirectional current collector D7 is connected with the first end of the thermistor RT. The anode of the eighth unidirectional current collector D8 is connected with a direct current power supply to be connected with a direct current voltage V2, and the cathode of the eighth unidirectional current collector D8 is connected with the first end of the thermistor RT. A second end of the thermistor RT is connected to an anode of the sixth unidirectional current collector D6. The anode of the ninth unidirectional conducting device D9 is connected with a direct current power supply to be connected with a direct current voltage V3, the cathode of the ninth unidirectional conducting device D9 is connected with the anode of the tenth unidirectional conducting device D10, and the cathode of the tenth unidirectional conducting device D10 is connected with the anode of the sixth unidirectional conducting device D6. The conducting voltage of each unidirectional conductor is a corresponding preset voltage threshold, and when the voltage applied to the anode of each unidirectional conductor is greater than the conducting voltage of each unidirectional conductor, each unidirectional conductor is conducted. Among them, the thermistor RT may be used to detect temperature, and change its resistance value when the temperature changes. For example, when the connected direct-current voltage V1 is solar energy, the thermistor RT can increase the resistance value along with the increase of the temperature, so that a better voltage division effect can be achieved, and the impact of the excessive solar energy on the power supply end of the control unit is avoided.

The filter subunit 220 includes a capacitor C8, a capacitor C9, and a capacitor C10, where a first end of the capacitor C8 is connected to the anode of the sixth unidirectional conductive apparatus D6, a second end of the capacitor C8 is grounded, a first end of the capacitor C9 is connected to the anode of the sixth unidirectional conductive apparatus D6, a second end of the capacitor C9 is connected to the first end of the capacitor C10, and a second end of the capacitor C10 is grounded. The filtering subunit 220 is configured to filter the ac component in the voltage.

In a specific implementation, with continued reference to FIG. 4, bleeder subunit 230 comprises a diode D13, a capacitor C11, a resistor R16, a resistor R17, and a resistor R18. The anode of the diode D13 is connected to the first conducting end of the change-over switch Q5, the cathode of the diode D13 is connected to the first end of the capacitor C11, the second end of the capacitor C11 is connected to the first end of the first primary winding, and the resistor R16, the resistor R17 and the resistor R18 are sequentially connected in series between the first end of the capacitor C11 and the second end of the capacitor C11.

In an embodiment, as shown in fig. 5, the power supply circuit 10 further includes a first holding unit 600 and a second holding unit 700. The first end of the first holding unit 600 is used for being connected with the first conducting end of the auxiliary power supply 20 to receive the output voltage; the second end of the first holding unit 600 is connected to the controlled end of the protection unit 400, and the controlled end of the first holding unit 600 is connected to the first conductive end of the protection unit 400; the first holding unit 600 is configured to control the protection unit 400 to hold outputting the second electrical signal for a first period of time when the protection unit 400 outputs the second electrical signal. Specifically, the first holding unit 600 may provide the first voltage to the controlled terminal of the protection unit 400 when the protection unit 400 outputs the second electrical signal, the first voltage is greater than the threshold voltage of the fourth switching tube Q4, the voltage of the controlled terminal of the fourth switching tube Q4 is raised by the first voltage and the first electrical signal, and the on time of the fourth switching tube Q4 may be increased in cooperation with the delay unit 500, so that the protection unit 400 keeps outputting the second electrical signal for the first duration.

The controlled end of the second holding unit 700 is connected to the first conducting end of the protection unit 400, the first end of the second holding unit 700 is connected to the controlled end of the protection unit 400, the second end of the second holding unit 700 is grounded, and the second holding unit 700 is used for controlling the protection unit 400 to stop outputting the second electrical signal after delaying the second time when the protection unit 400 stops outputting the second electrical signal. By prolonging the time for the protection unit 400 to stop outputting the second electrical signal, the starting unit 100 can be kept in the working state for the second duration, so that the starting unit 100 is prevented from being turned off immediately after the control unit 300 is powered on, and the stability is improved.

In an embodiment, as shown in fig. 6, the first holding unit 600 includes a first switching tube Q1, a first energy storage capacitor C4, a first blocking capacitor C5, a first voltage dividing resistor R1, a second voltage dividing resistor R2, and a first unidirectional current collector D1. Wherein the first unidirectional current collector D1 may be a diode. The first end of the first blocking capacitor C5 is connected to the first conducting end of the protection unit 400, specifically to the first conducting end of the fourth switching tube Q4 in the protection unit 400. Specifically, the first end of the first blocking capacitor C5 is connected to the first conducting end of the fourth switching tube Q4 in the protection unit 400, that is, the D pole of the fourth switching tube Q4. The second end of the first blocking capacitor C5 is connected to the first end of the first voltage dividing resistor R1, the second end of the first voltage dividing resistor R1 is connected to the controlled end of the first switching tube Q1, and the first conducting end of the first switching tube Q1 may also be connected to the first end VZ of the filtering unit 130, so as to receive the output voltage VOUT1 or the supply voltage VIN when the first switching tube Q1 is turned on. The second conducting end of the first switching tube Q1 is connected with the controlled end of the protection unit 400. Specifically, the second conducting end of the first switching tube Q1 is connected to the controlled end of the fourth switching tube Q4 in the protection unit 400, that is, the G pole of the fourth switching tube Q4. The first end of the first energy storage capacitor C4 is connected with the controlled end of the first switching tube Q1, the second end of the first energy storage capacitor C4 is connected with the first conducting end of the first switching tube Q1, the second voltage dividing resistor R2 is connected with the first energy storage capacitor C4 in parallel, the positive electrode of the first unidirectional conductor D1 is connected with the controlled end of the first switching tube Q1, and the negative electrode of the first unidirectional conductor D1 is connected with the first conducting end of the first switching tube Q1. The first switch tube Q1 may be a PNP triode, the first conducting end of the first switch tube Q1 corresponds to an emitter of the PNP triode, the second conducting end of the first switch tube Q1 corresponds to a collector of the PNP triode, and the controlled end of the first switch tube Q1 corresponds to a base of the PNP triode.

It should be noted that, at the moment when the fourth switching tube Q4 is turned on, the first conduction end of the fourth switching tube Q4 changes from high level to low level, the first switching tube Q1 can be turned on at the moment of level jump through the first blocking capacitor C5, and the controlled end of the fourth switching tube Q4 can receive the voltage of the power supply end VCC of the control unit 300, so that the voltage of the controlled end of the fourth switching tube Q4 rises rapidly. Due to the delay unit 500, after the voltage is applied to the controlled end of the fourth switching tube Q4, even when the control unit 300 stops outputting the first electrical signal (i.e. when the output end of the auxiliary power supply 20 has a short-circuit fault, the output voltage VOUT1 is 0), the voltage of the controlled end of the fourth switching tube Q4 will be always greater than the threshold voltage of the fourth switching tube Q4 for at least the first period, so that the fourth switching tube Q4 remains on for at least the first period, i.e. the protection unit 400 keeps outputting the second electrical signal for the first period. The length of the first time period can be adjusted by configuring parameters of the delay capacitor C3 and the delay resistor R15. In an example, the first duration is 4 seconds, i.e. the fourth switching tube Q4 may be turned off after the fourth switching tube Q4 is turned on for at least 4 seconds.

In an embodiment, as shown in fig. 7, the second holding unit 700 includes a second switching tube Q2, a second energy storage capacitor C7, a second blocking capacitor C6, a third voltage dividing resistor R3, a fourth voltage dividing resistor R4, and a second unidirectional conductive apparatus D2. Wherein the second unidirectional current collector D2 may be a diode. The first end of the second blocking capacitor C6 is connected to the first conducting end of the protection unit 400, and the second end of the second blocking capacitor C6 is connected to the first end of the third voltage dividing resistor R3. The second end of the third voltage dividing resistor R3 is connected with the controlled end of the second switching tube Q2, the first conducting end of the second switching tube Q2 is grounded, and the second conducting end of the second switching tube Q2 is grounded. The first end of the second energy storage capacitor C7 is connected with the controlled end of the second switching tube Q2, and the second end of the second energy storage capacitor C7 is connected with the second conducting end of the second switching tube Q2. The fourth voltage dividing resistor R4 is connected with the second energy storage capacitor C7 in parallel, the anode of the second unidirectional conductor D2 is connected with the second conducting end of the second switching tube Q2, and the cathode of the second unidirectional conductor D2 is connected with the controlled end of the second switching tube Q2. The second switching tube Q2 may be an NPN triode, the first conducting end of the second switching tube Q2 corresponds to an emitter of the NPN triode, the second conducting end of the second switching tube Q2 corresponds to a collector of the NPN triode, and the controlled end of the second switching tube Q2 corresponds to a base of the NPN triode.

It should be noted that, at the moment when the fourth switching tube Q4 is turned off, the first conducting end of the fourth switching tube Q4 is changed from low level to high level, the second switching tube Q2 may be turned on at the moment of level jump through the second blocking capacitor C6, so that the controlled end of the fourth switching tube Q4 is grounded, the electric energy on the delay capacitor C3 is quickly released, even in the second period after the control unit 300 is powered on to output the first electric signal, the voltage at the controlled end of the fourth switching tube Q4 is still lower than the threshold voltage, the fourth switching tube Q4 cannot be turned on, that is, the protection unit 400 stops outputting the second electric signal in the second period, and the starting unit 100 maintains the working state in the second period. The length of the second time period can be adjusted by configuring parameters of the delay capacitor C3 and the delay resistor R15. In an example, the second duration is 4 seconds, i.e. the fourth switching tube Q4 may be turned on only after the fourth switching tube Q4 is turned off for 4 seconds.

By extending the off-time and on-time of the starting unit 100 by the first holding unit 600 and the second holding unit 700, respectively, the frequency of switching the starting unit 100 between the on-state and the off-state can be reduced, and hiccup protection is realized, thereby protecting the starting unit 100.

With continued reference to fig. 1 and 2, the present application also provides an auxiliary power supply 20, wherein the auxiliary power supply 20 includes a power supply circuit 10, a transformation circuit 30, and an output circuit 40 as in any of the embodiments described above. The power supply circuit 10 is coupled to the primary side of the transformer circuit 30, and the output circuit 40 is coupled to the secondary side of the transformer circuit 30.

The auxiliary power supply 20 can be in an auxiliary power supply output short circuit, the power supply circuit 10 of the auxiliary power supply 20 can control the protection unit 400 through the first electric signal output by the second output end VREF of the control unit 300, so that the protection unit 400 outputs the second electric signal when receiving the first electric signal, and the starting unit 100 is controlled to stop outputting the starting voltage, so that the control unit enters a power-off protection state, and the problem that the starting unit 100 is always in a working state due to the short circuit of the output end of the auxiliary power supply 20, and the resulting elements in the starting unit 100 are burnt due to overlong working time is avoided.

Fig. 8 is a schematic diagram of an electronic device according to an embodiment of the present application, and for convenience of explanation, only a portion related to the embodiment is shown, which is described in detail below:

an electronic device 80 comprising an auxiliary power supply 20 as in any of the embodiments above and a power module 90 connected to the auxiliary power supply 20. The electronic device 80 may be an energy storage device or powered device, and the auxiliary power supply 20 may be connected to the power supply 70 to generate an output voltage based on a power supply voltage provided by the power supply 70, where the output voltage may provide power to the power module 90 of the electronic device 80. The present embodiment is not limited to the specific type, function of the electronic device 80.

The auxiliary power supply 20 can provide the voltage required by the operation of the electronic device 80 when the electronic device 80 is started, and stop the power supply after the electronic device 80 stably operates, so that the stability of the operation of the electronic device 80 can be improved by the auxiliary power supply 20. The power supply circuit 10 of the present application can significantly improve the service life of the auxiliary power supply 20.

In one embodiment, the power supply 70 may be a battery or a solar panel. The power module 90 may be a digital circuit.

In one embodiment, when the electronic device 80 is an energy storage device, the power module 90 may be an inverter module in the energy storage device.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A power supply circuit, characterized by being applied to an auxiliary power supply, for supplying a target voltage to the auxiliary power supply so that the auxiliary power supply generates an output voltage based on the target voltage and outputs the output voltage; the power supply circuit includes: the device comprises a starting unit, a conversion unit, a control unit and a protection unit;

the starting unit is used for being connected with a power supply, and is used for generating starting voltage based on the power supply voltage of the power supply;

the conversion unit is used for being connected with the power supply and the control unit; the conversion unit is used for converting the power supply voltage into the target voltage under the control of the control unit and then supplying power to the auxiliary power supply;

the power end of the control unit is respectively connected with the output end of the auxiliary power supply and the output end of the starting unit, and the control unit is used for powering on and starting when receiving the output voltage or the starting voltage; the first output end of the control unit is connected with the conversion unit so as to control the conversion unit; the second output end of the control unit is connected with the controlled end of the protection unit, and the control unit is further used for outputting a first electric signal at the second output end when the control unit is electrified and started;

The first conducting end of the protection unit is connected with the starting unit; the second conducting end of the protection unit is grounded; the protection unit is used for outputting a second electric signal when receiving the first electric signal; the second electric signal is used for controlling the starting unit to stop outputting the starting voltage.

2. The power supply circuit of claim 1, further comprising a delay unit; the first end of the delay unit is connected with the controlled end of the protection unit, and the second end of the delay unit is grounded; the delay unit is used for delaying the time when the first electric signal reaches the protection unit or delaying the time when the first electric signal is removed from the control end of the protection unit.

3. The power supply circuit of claim 2, wherein the delay unit comprises a delay resistor and a delay capacitor, a first end of the delay capacitor is connected to the controlled end of the protection unit, a second end of the delay capacitor is grounded, and the delay resistor is connected in parallel with the delay capacitor.

4. The power supply circuit of claim 1, further comprising a first holding unit; the first end of the first holding unit is used for being connected with the output end of the auxiliary power supply so as to receive the output voltage; the second end of the first holding unit is connected with the controlled end of the protection unit, and the controlled end of the first holding unit is connected with the first conducting end of the protection unit; the first holding unit is used for controlling the protection unit to keep outputting the second electric signal in a first duration when the protection unit outputs the second electric signal.

5. The power supply circuit of claim 4, wherein the first holding unit comprises a first switching tube, a first energy storage capacitor, a first blocking capacitor, a first voltage dividing resistor, a second voltage dividing resistor, and a first unidirectional conductor;

the first end of the first blocking capacitor is connected with the first conducting end of the protection unit, the second end of the first blocking capacitor is connected with the first end of the first voltage dividing resistor, the second end of the first voltage dividing resistor is connected with the controlled end of the first switch tube, the first conducting end of the first switch tube is respectively connected with the output end of the auxiliary power supply, the second conducting end of the first switch tube is connected with the controlled end of the protection unit, the first end of the first energy storage capacitor is connected with the controlled end of the first switch tube, the second end of the first energy storage capacitor is connected with the first conducting end of the first switch tube, the second voltage dividing resistor is connected with the first energy storage capacitor in parallel, the positive electrode of the first unidirectional conductor is connected with the controlled end of the first switch tube, and the negative electrode of the first unidirectional conductor is connected with the first conducting end of the first switch tube.

6. The power supply circuit of claim 1, further comprising a second holding unit, a controlled end of the second holding unit being connected to the first conductive end of the protection unit; the first end of the second holding unit is connected with the controlled end of the protection unit, and the second end of the second holding unit is grounded; the second holding unit is used for controlling the protection unit to stop outputting the second electric signal after delaying a second time period when the protection unit stops outputting the second electric signal.

7. The power supply circuit of claim 6, wherein the second holding unit comprises a second switching tube, a second storage capacitor, a second blocking capacitor, a third and fourth voltage dividing resistors, and a second unidirectional conductor;

the first end of the second blocking capacitor is connected with the first conducting end of the protection unit, the second end of the second blocking capacitor is connected with the first end of the third voltage dividing resistor, the second end of the third voltage dividing resistor is connected with the controlled end of the second switching tube, the first conducting end of the second switching tube is connected with the controlled end of the protection unit, the second conducting end of the second switching tube is grounded, the first end of the second energy storage capacitor is connected with the controlled end of the second switching tube, the second end of the second energy storage capacitor is connected with the second conducting end of the second switching tube, the fourth voltage dividing resistor is connected in parallel with the second energy storage capacitor, the positive electrode of the second unidirectional conductor is connected with the second conducting end of the second switching tube, and the negative electrode of the second unidirectional conductor is connected with the controlled end of the second switching tube.

8. The power supply circuit of claim 1, wherein the starting unit comprises a first voltage dividing unit, a second voltage dividing unit, and a third switching tube; the protection unit comprises a fourth switching tube;

the first end of the first voltage division unit is used for being connected with the power supply, the second end of the first voltage division unit is connected with the controlled end of the third switching tube and the first conducting end of the fourth switching tube, the first end of the second voltage division unit is used for being connected with the power supply, the second end of the second voltage division unit is connected with the first conducting end of the third switching tube, and the second conducting end of the third switching tube is connected with the power supply end of the control unit;

the controlled end of the fourth switching tube is connected with the second output end of the control unit, the second conducting end of the fourth switching tube is grounded, and the fourth switching tube is configured to be conducted when the first electric signal is received so as to output the second electric signal with a low level at the first conducting end; the second electric signal is used for controlling the third switching tube to be turned off.

9. An auxiliary power supply is characterized by comprising a power supply circuit, a transformation circuit and an output circuit; the power supply circuit is the power supply circuit according to any one of claims 1 to 8; the conversion unit of the power supply circuit is coupled to the primary side of the transformer circuit, and the output circuit is coupled to the secondary side of the transformer circuit.

10. An electronic device comprising the auxiliary power supply of claim 9.